diff options
Diffstat (limited to 'kernel/drivers/scsi/libfc')
| -rw-r--r-- | kernel/drivers/scsi/libfc/Makefile | 14 | ||||
| -rw-r--r-- | kernel/drivers/scsi/libfc/fc_disc.c | 753 | ||||
| -rw-r--r-- | kernel/drivers/scsi/libfc/fc_elsct.c | 152 | ||||
| -rw-r--r-- | kernel/drivers/scsi/libfc/fc_exch.c | 2631 | ||||
| -rw-r--r-- | kernel/drivers/scsi/libfc/fc_fcp.c | 2245 | ||||
| -rw-r--r-- | kernel/drivers/scsi/libfc/fc_frame.c | 91 | ||||
| -rw-r--r-- | kernel/drivers/scsi/libfc/fc_libfc.c | 331 | ||||
| -rw-r--r-- | kernel/drivers/scsi/libfc/fc_libfc.h | 139 | ||||
| -rw-r--r-- | kernel/drivers/scsi/libfc/fc_lport.c | 2144 | ||||
| -rw-r--r-- | kernel/drivers/scsi/libfc/fc_npiv.c | 159 | ||||
| -rw-r--r-- | kernel/drivers/scsi/libfc/fc_rport.c | 2069 |
11 files changed, 10728 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/libfc/Makefile b/kernel/drivers/scsi/libfc/Makefile new file mode 100644 index 000000000..4bb23ac86 --- /dev/null +++ b/kernel/drivers/scsi/libfc/Makefile @@ -0,0 +1,14 @@ +# $Id: Makefile + +obj-$(CONFIG_LIBFC) += libfc.o + +libfc-objs := \ + fc_libfc.o \ + fc_disc.o \ + fc_exch.o \ + fc_elsct.o \ + fc_frame.o \ + fc_lport.o \ + fc_rport.o \ + fc_fcp.o \ + fc_npiv.o diff --git a/kernel/drivers/scsi/libfc/fc_disc.c b/kernel/drivers/scsi/libfc/fc_disc.c new file mode 100644 index 000000000..880a9068c --- /dev/null +++ b/kernel/drivers/scsi/libfc/fc_disc.c @@ -0,0 +1,753 @@ +/* + * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +/* + * Target Discovery + * + * This block discovers all FC-4 remote ports, including FCP initiators. It + * also handles RSCN events and re-discovery if necessary. + */ + +/* + * DISC LOCKING + * + * The disc mutex is can be locked when acquiring rport locks, but may not + * be held when acquiring the lport lock. Refer to fc_lport.c for more + * details. + */ + +#include <linux/timer.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/export.h> +#include <asm/unaligned.h> + +#include <scsi/fc/fc_gs.h> + +#include <scsi/libfc.h> + +#include "fc_libfc.h" + +#define FC_DISC_RETRY_LIMIT 3 /* max retries */ +#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ + +static void fc_disc_gpn_ft_req(struct fc_disc *); +static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); +static void fc_disc_done(struct fc_disc *, enum fc_disc_event); +static void fc_disc_timeout(struct work_struct *); +static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); +static void fc_disc_restart(struct fc_disc *); + +/** + * fc_disc_stop_rports() - Delete all the remote ports associated with the lport + * @disc: The discovery job to stop remote ports on + * + * Locking Note: This function expects that the lport mutex is locked before + * calling it. + */ +static void fc_disc_stop_rports(struct fc_disc *disc) +{ + struct fc_lport *lport; + struct fc_rport_priv *rdata; + + lport = fc_disc_lport(disc); + + mutex_lock(&disc->disc_mutex); + list_for_each_entry_rcu(rdata, &disc->rports, peers) + lport->tt.rport_logoff(rdata); + mutex_unlock(&disc->disc_mutex); +} + +/** + * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) + * @disc: The discovery object to which the RSCN applies + * @fp: The RSCN frame + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + */ +static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp) +{ + struct fc_lport *lport; + struct fc_els_rscn *rp; + struct fc_els_rscn_page *pp; + struct fc_seq_els_data rjt_data; + unsigned int len; + int redisc = 0; + enum fc_els_rscn_ev_qual ev_qual; + enum fc_els_rscn_addr_fmt fmt; + LIST_HEAD(disc_ports); + struct fc_disc_port *dp, *next; + + lport = fc_disc_lport(disc); + + FC_DISC_DBG(disc, "Received an RSCN event\n"); + + /* make sure the frame contains an RSCN message */ + rp = fc_frame_payload_get(fp, sizeof(*rp)); + if (!rp) + goto reject; + /* make sure the page length is as expected (4 bytes) */ + if (rp->rscn_page_len != sizeof(*pp)) + goto reject; + /* get the RSCN payload length */ + len = ntohs(rp->rscn_plen); + if (len < sizeof(*rp)) + goto reject; + /* make sure the frame contains the expected payload */ + rp = fc_frame_payload_get(fp, len); + if (!rp) + goto reject; + /* payload must be a multiple of the RSCN page size */ + len -= sizeof(*rp); + if (len % sizeof(*pp)) + goto reject; + + for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { + ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; + ev_qual &= ELS_RSCN_EV_QUAL_MASK; + fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; + fmt &= ELS_RSCN_ADDR_FMT_MASK; + /* + * if we get an address format other than port + * (area, domain, fabric), then do a full discovery + */ + switch (fmt) { + case ELS_ADDR_FMT_PORT: + FC_DISC_DBG(disc, "Port address format for port " + "(%6.6x)\n", ntoh24(pp->rscn_fid)); + dp = kzalloc(sizeof(*dp), GFP_KERNEL); + if (!dp) { + redisc = 1; + break; + } + dp->lp = lport; + dp->port_id = ntoh24(pp->rscn_fid); + list_add_tail(&dp->peers, &disc_ports); + break; + case ELS_ADDR_FMT_AREA: + case ELS_ADDR_FMT_DOM: + case ELS_ADDR_FMT_FAB: + default: + FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); + redisc = 1; + break; + } + } + lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); + + /* + * If not doing a complete rediscovery, do GPN_ID on + * the individual ports mentioned in the list. + * If any of these get an error, do a full rediscovery. + * In any case, go through the list and free the entries. + */ + list_for_each_entry_safe(dp, next, &disc_ports, peers) { + list_del(&dp->peers); + if (!redisc) + redisc = fc_disc_single(lport, dp); + kfree(dp); + } + if (redisc) { + FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); + fc_disc_restart(disc); + } else { + FC_DISC_DBG(disc, "RSCN received: not rediscovering. " + "redisc %d state %d in_prog %d\n", + redisc, lport->state, disc->pending); + } + fc_frame_free(fp); + return; +reject: + FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); + rjt_data.reason = ELS_RJT_LOGIC; + rjt_data.explan = ELS_EXPL_NONE; + lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); + fc_frame_free(fp); +} + +/** + * fc_disc_recv_req() - Handle incoming requests + * @lport: The local port receiving the request + * @fp: The request frame + * + * Locking Note: This function is called from the EM and will lock + * the disc_mutex before calling the handler for the + * request. + */ +static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp) +{ + u8 op; + struct fc_disc *disc = &lport->disc; + + op = fc_frame_payload_op(fp); + switch (op) { + case ELS_RSCN: + mutex_lock(&disc->disc_mutex); + fc_disc_recv_rscn_req(disc, fp); + mutex_unlock(&disc->disc_mutex); + break; + default: + FC_DISC_DBG(disc, "Received an unsupported request, " + "the opcode is (%x)\n", op); + fc_frame_free(fp); + break; + } +} + +/** + * fc_disc_restart() - Restart discovery + * @disc: The discovery object to be restarted + * + * Locking Note: This function expects that the disc mutex + * is already locked. + */ +static void fc_disc_restart(struct fc_disc *disc) +{ + if (!disc->disc_callback) + return; + + FC_DISC_DBG(disc, "Restarting discovery\n"); + + disc->requested = 1; + if (disc->pending) + return; + + /* + * Advance disc_id. This is an arbitrary non-zero number that will + * match the value in the fc_rport_priv after discovery for all + * freshly-discovered remote ports. Avoid wrapping to zero. + */ + disc->disc_id = (disc->disc_id + 2) | 1; + disc->retry_count = 0; + fc_disc_gpn_ft_req(disc); +} + +/** + * fc_disc_start() - Start discovery on a local port + * @lport: The local port to have discovery started on + * @disc_callback: Callback function to be called when discovery is complete + */ +static void fc_disc_start(void (*disc_callback)(struct fc_lport *, + enum fc_disc_event), + struct fc_lport *lport) +{ + struct fc_disc *disc = &lport->disc; + + /* + * At this point we may have a new disc job or an existing + * one. Either way, let's lock when we make changes to it + * and send the GPN_FT request. + */ + mutex_lock(&disc->disc_mutex); + disc->disc_callback = disc_callback; + fc_disc_restart(disc); + mutex_unlock(&disc->disc_mutex); +} + +/** + * fc_disc_done() - Discovery has been completed + * @disc: The discovery context + * @event: The discovery completion status + * + * Locking Note: This function expects that the disc mutex is locked before + * it is called. The discovery callback is then made with the lock released, + * and the lock is re-taken before returning from this function + */ +static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) +{ + struct fc_lport *lport = fc_disc_lport(disc); + struct fc_rport_priv *rdata; + + FC_DISC_DBG(disc, "Discovery complete\n"); + + disc->pending = 0; + if (disc->requested) { + fc_disc_restart(disc); + return; + } + + /* + * Go through all remote ports. If they were found in the latest + * discovery, reverify or log them in. Otherwise, log them out. + * Skip ports which were never discovered. These are the dNS port + * and ports which were created by PLOGI. + */ + list_for_each_entry_rcu(rdata, &disc->rports, peers) { + if (!rdata->disc_id) + continue; + if (rdata->disc_id == disc->disc_id) + lport->tt.rport_login(rdata); + else + lport->tt.rport_logoff(rdata); + } + + mutex_unlock(&disc->disc_mutex); + disc->disc_callback(lport, event); + mutex_lock(&disc->disc_mutex); +} + +/** + * fc_disc_error() - Handle error on dNS request + * @disc: The discovery context + * @fp: The error code encoded as a frame pointer + */ +static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) +{ + struct fc_lport *lport = fc_disc_lport(disc); + unsigned long delay = 0; + + FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n", + PTR_ERR(fp), disc->retry_count, + FC_DISC_RETRY_LIMIT); + + if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { + /* + * Memory allocation failure, or the exchange timed out, + * retry after delay. + */ + if (disc->retry_count < FC_DISC_RETRY_LIMIT) { + /* go ahead and retry */ + if (!fp) + delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); + else { + delay = msecs_to_jiffies(lport->e_d_tov); + + /* timeout faster first time */ + if (!disc->retry_count) + delay /= 4; + } + disc->retry_count++; + schedule_delayed_work(&disc->disc_work, delay); + } else + fc_disc_done(disc, DISC_EV_FAILED); + } else if (PTR_ERR(fp) == -FC_EX_CLOSED) { + /* + * if discovery fails due to lport reset, clear + * pending flag so that subsequent discovery can + * continue + */ + disc->pending = 0; + } +} + +/** + * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request + * @lport: The discovery context + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + */ +static void fc_disc_gpn_ft_req(struct fc_disc *disc) +{ + struct fc_frame *fp; + struct fc_lport *lport = fc_disc_lport(disc); + + WARN_ON(!fc_lport_test_ready(lport)); + + disc->pending = 1; + disc->requested = 0; + + disc->buf_len = 0; + disc->seq_count = 0; + fp = fc_frame_alloc(lport, + sizeof(struct fc_ct_hdr) + + sizeof(struct fc_ns_gid_ft)); + if (!fp) + goto err; + + if (lport->tt.elsct_send(lport, 0, fp, + FC_NS_GPN_FT, + fc_disc_gpn_ft_resp, + disc, 3 * lport->r_a_tov)) + return; +err: + fc_disc_error(disc, NULL); +} + +/** + * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. + * @lport: The local port the GPN_FT was received on + * @buf: The GPN_FT response buffer + * @len: The size of response buffer + * + * Goes through the list of IDs and names resulting from a request. + */ +static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) +{ + struct fc_lport *lport; + struct fc_gpn_ft_resp *np; + char *bp; + size_t plen; + size_t tlen; + int error = 0; + struct fc_rport_identifiers ids; + struct fc_rport_priv *rdata; + + lport = fc_disc_lport(disc); + disc->seq_count++; + + /* + * Handle partial name record left over from previous call. + */ + bp = buf; + plen = len; + np = (struct fc_gpn_ft_resp *)bp; + tlen = disc->buf_len; + disc->buf_len = 0; + if (tlen) { + WARN_ON(tlen >= sizeof(*np)); + plen = sizeof(*np) - tlen; + WARN_ON(plen <= 0); + WARN_ON(plen >= sizeof(*np)); + if (plen > len) + plen = len; + np = &disc->partial_buf; + memcpy((char *)np + tlen, bp, plen); + + /* + * Set bp so that the loop below will advance it to the + * first valid full name element. + */ + bp -= tlen; + len += tlen; + plen += tlen; + disc->buf_len = (unsigned char) plen; + if (plen == sizeof(*np)) + disc->buf_len = 0; + } + + /* + * Handle full name records, including the one filled from above. + * Normally, np == bp and plen == len, but from the partial case above, + * bp, len describe the overall buffer, and np, plen describe the + * partial buffer, which if would usually be full now. + * After the first time through the loop, things return to "normal". + */ + while (plen >= sizeof(*np)) { + ids.port_id = ntoh24(np->fp_fid); + ids.port_name = ntohll(np->fp_wwpn); + + if (ids.port_id != lport->port_id && + ids.port_name != lport->wwpn) { + rdata = lport->tt.rport_create(lport, ids.port_id); + if (rdata) { + rdata->ids.port_name = ids.port_name; + rdata->disc_id = disc->disc_id; + } else { + printk(KERN_WARNING "libfc: Failed to allocate " + "memory for the newly discovered port " + "(%6.6x)\n", ids.port_id); + error = -ENOMEM; + } + } + + if (np->fp_flags & FC_NS_FID_LAST) { + fc_disc_done(disc, DISC_EV_SUCCESS); + len = 0; + break; + } + len -= sizeof(*np); + bp += sizeof(*np); + np = (struct fc_gpn_ft_resp *)bp; + plen = len; + } + + /* + * Save any partial record at the end of the buffer for next time. + */ + if (error == 0 && len > 0 && len < sizeof(*np)) { + if (np != &disc->partial_buf) { + FC_DISC_DBG(disc, "Partial buffer remains " + "for discovery\n"); + memcpy(&disc->partial_buf, np, len); + } + disc->buf_len = (unsigned char) len; + } + return error; +} + +/** + * fc_disc_timeout() - Handler for discovery timeouts + * @work: Structure holding discovery context that needs to retry discovery + */ +static void fc_disc_timeout(struct work_struct *work) +{ + struct fc_disc *disc = container_of(work, + struct fc_disc, + disc_work.work); + mutex_lock(&disc->disc_mutex); + fc_disc_gpn_ft_req(disc); + mutex_unlock(&disc->disc_mutex); +} + +/** + * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) + * @sp: The sequence that the GPN_FT response was received on + * @fp: The GPN_FT response frame + * @lp_arg: The discovery context + * + * Locking Note: This function is called without disc mutex held, and + * should do all its processing with the mutex held + */ +static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, + void *disc_arg) +{ + struct fc_disc *disc = disc_arg; + struct fc_ct_hdr *cp; + struct fc_frame_header *fh; + enum fc_disc_event event = DISC_EV_NONE; + unsigned int seq_cnt; + unsigned int len; + int error = 0; + + mutex_lock(&disc->disc_mutex); + FC_DISC_DBG(disc, "Received a GPN_FT response\n"); + + if (IS_ERR(fp)) { + fc_disc_error(disc, fp); + mutex_unlock(&disc->disc_mutex); + return; + } + + WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ + fh = fc_frame_header_get(fp); + len = fr_len(fp) - sizeof(*fh); + seq_cnt = ntohs(fh->fh_seq_cnt); + if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { + cp = fc_frame_payload_get(fp, sizeof(*cp)); + if (!cp) { + FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", + fr_len(fp)); + event = DISC_EV_FAILED; + } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { + + /* Accepted, parse the response. */ + len -= sizeof(*cp); + error = fc_disc_gpn_ft_parse(disc, cp + 1, len); + } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { + FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " + "(check zoning)\n", cp->ct_reason, + cp->ct_explan); + event = DISC_EV_FAILED; + if (cp->ct_reason == FC_FS_RJT_UNABL && + cp->ct_explan == FC_FS_EXP_FTNR) + event = DISC_EV_SUCCESS; + } else { + FC_DISC_DBG(disc, "GPN_FT unexpected response code " + "%x\n", ntohs(cp->ct_cmd)); + event = DISC_EV_FAILED; + } + } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { + error = fc_disc_gpn_ft_parse(disc, fh + 1, len); + } else { + FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " + "seq_cnt %x expected %x sof %x eof %x\n", + seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); + event = DISC_EV_FAILED; + } + if (error) + fc_disc_error(disc, fp); + else if (event != DISC_EV_NONE) + fc_disc_done(disc, event); + fc_frame_free(fp); + mutex_unlock(&disc->disc_mutex); +} + +/** + * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) + * @sp: The sequence the GPN_ID is on + * @fp: The response frame + * @rdata_arg: The remote port that sent the GPN_ID response + * + * Locking Note: This function is called without disc mutex held. + */ +static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + struct fc_rport_priv *new_rdata; + struct fc_lport *lport; + struct fc_disc *disc; + struct fc_ct_hdr *cp; + struct fc_ns_gid_pn *pn; + u64 port_name; + + lport = rdata->local_port; + disc = &lport->disc; + + mutex_lock(&disc->disc_mutex); + if (PTR_ERR(fp) == -FC_EX_CLOSED) + goto out; + if (IS_ERR(fp)) + goto redisc; + + cp = fc_frame_payload_get(fp, sizeof(*cp)); + if (!cp) + goto redisc; + if (ntohs(cp->ct_cmd) == FC_FS_ACC) { + if (fr_len(fp) < sizeof(struct fc_frame_header) + + sizeof(*cp) + sizeof(*pn)) + goto redisc; + pn = (struct fc_ns_gid_pn *)(cp + 1); + port_name = get_unaligned_be64(&pn->fn_wwpn); + if (rdata->ids.port_name == -1) + rdata->ids.port_name = port_name; + else if (rdata->ids.port_name != port_name) { + FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " + "Port-id %6.6x wwpn %16.16llx\n", + rdata->ids.port_id, port_name); + lport->tt.rport_logoff(rdata); + + new_rdata = lport->tt.rport_create(lport, + rdata->ids.port_id); + if (new_rdata) { + new_rdata->disc_id = disc->disc_id; + lport->tt.rport_login(new_rdata); + } + goto out; + } + rdata->disc_id = disc->disc_id; + lport->tt.rport_login(rdata); + } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { + FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", + cp->ct_reason, cp->ct_explan); + lport->tt.rport_logoff(rdata); + } else { + FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", + ntohs(cp->ct_cmd)); +redisc: + fc_disc_restart(disc); + } +out: + mutex_unlock(&disc->disc_mutex); + kref_put(&rdata->kref, lport->tt.rport_destroy); +} + +/** + * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request + * @lport: The local port to initiate discovery on + * @rdata: remote port private data + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + * On failure, an error code is returned. + */ +static int fc_disc_gpn_id_req(struct fc_lport *lport, + struct fc_rport_priv *rdata) +{ + struct fc_frame *fp; + + fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + + sizeof(struct fc_ns_fid)); + if (!fp) + return -ENOMEM; + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, + fc_disc_gpn_id_resp, rdata, + 3 * lport->r_a_tov)) + return -ENOMEM; + kref_get(&rdata->kref); + return 0; +} + +/** + * fc_disc_single() - Discover the directory information for a single target + * @lport: The local port the remote port is associated with + * @dp: The port to rediscover + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + */ +static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) +{ + struct fc_rport_priv *rdata; + + rdata = lport->tt.rport_create(lport, dp->port_id); + if (!rdata) + return -ENOMEM; + rdata->disc_id = 0; + return fc_disc_gpn_id_req(lport, rdata); +} + +/** + * fc_disc_stop() - Stop discovery for a given lport + * @lport: The local port that discovery should stop on + */ +static void fc_disc_stop(struct fc_lport *lport) +{ + struct fc_disc *disc = &lport->disc; + + if (disc->pending) + cancel_delayed_work_sync(&disc->disc_work); + fc_disc_stop_rports(disc); +} + +/** + * fc_disc_stop_final() - Stop discovery for a given lport + * @lport: The lport that discovery should stop on + * + * This function will block until discovery has been + * completely stopped and all rports have been deleted. + */ +static void fc_disc_stop_final(struct fc_lport *lport) +{ + fc_disc_stop(lport); + lport->tt.rport_flush_queue(); +} + +/** + * fc_disc_config() - Configure the discovery layer for a local port + * @lport: The local port that needs the discovery layer to be configured + * @priv: Private data structre for users of the discovery layer + */ +void fc_disc_config(struct fc_lport *lport, void *priv) +{ + struct fc_disc *disc = &lport->disc; + + if (!lport->tt.disc_start) + lport->tt.disc_start = fc_disc_start; + + if (!lport->tt.disc_stop) + lport->tt.disc_stop = fc_disc_stop; + + if (!lport->tt.disc_stop_final) + lport->tt.disc_stop_final = fc_disc_stop_final; + + if (!lport->tt.disc_recv_req) + lport->tt.disc_recv_req = fc_disc_recv_req; + + disc = &lport->disc; + + disc->priv = priv; +} +EXPORT_SYMBOL(fc_disc_config); + +/** + * fc_disc_init() - Initialize the discovery layer for a local port + * @lport: The local port that needs the discovery layer to be initialized + */ +void fc_disc_init(struct fc_lport *lport) +{ + struct fc_disc *disc = &lport->disc; + + INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); + mutex_init(&disc->disc_mutex); + INIT_LIST_HEAD(&disc->rports); +} +EXPORT_SYMBOL(fc_disc_init); diff --git a/kernel/drivers/scsi/libfc/fc_elsct.c b/kernel/drivers/scsi/libfc/fc_elsct.c new file mode 100644 index 000000000..c2384d501 --- /dev/null +++ b/kernel/drivers/scsi/libfc/fc_elsct.c @@ -0,0 +1,152 @@ +/* + * Copyright(c) 2008 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +/* + * Provide interface to send ELS/CT FC frames + */ + +#include <linux/export.h> +#include <asm/unaligned.h> +#include <scsi/fc/fc_gs.h> +#include <scsi/fc/fc_ns.h> +#include <scsi/fc/fc_els.h> +#include <scsi/libfc.h> +#include <scsi/fc_encode.h> +#include "fc_libfc.h" + +/** + * fc_elsct_send() - Send an ELS or CT frame + * @lport: The local port to send the frame on + * @did: The destination ID for the frame + * @fp: The frame to be sent + * @op: The operational code + * @resp: The callback routine when the response is received + * @arg: The argument to pass to the response callback routine + * @timer_msec: The timeout period for the frame (in msecs) + */ +struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did, + struct fc_frame *fp, unsigned int op, + void (*resp)(struct fc_seq *, + struct fc_frame *, + void *), + void *arg, u32 timer_msec) +{ + enum fc_rctl r_ctl; + enum fc_fh_type fh_type; + int rc; + + /* ELS requests */ + if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS)) + rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type); + else { + /* CT requests */ + rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type, &did); + } + + if (rc) { + fc_frame_free(fp); + return NULL; + } + + fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type, + FC_FCTL_REQ, 0); + + return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec); +} +EXPORT_SYMBOL(fc_elsct_send); + +/** + * fc_elsct_init() - Initialize the ELS/CT layer + * @lport: The local port to initialize the ELS/CT layer for + */ +int fc_elsct_init(struct fc_lport *lport) +{ + if (!lport->tt.elsct_send) + lport->tt.elsct_send = fc_elsct_send; + + return 0; +} +EXPORT_SYMBOL(fc_elsct_init); + +/** + * fc_els_resp_type() - Return a string describing the ELS response + * @fp: The frame pointer or possible error code + */ +const char *fc_els_resp_type(struct fc_frame *fp) +{ + const char *msg; + struct fc_frame_header *fh; + struct fc_ct_hdr *ct; + + if (IS_ERR(fp)) { + switch (-PTR_ERR(fp)) { + case FC_NO_ERR: + msg = "response no error"; + break; + case FC_EX_TIMEOUT: + msg = "response timeout"; + break; + case FC_EX_CLOSED: + msg = "response closed"; + break; + default: + msg = "response unknown error"; + break; + } + } else { + fh = fc_frame_header_get(fp); + switch (fh->fh_type) { + case FC_TYPE_ELS: + switch (fc_frame_payload_op(fp)) { + case ELS_LS_ACC: + msg = "accept"; + break; + case ELS_LS_RJT: + msg = "reject"; + break; + default: + msg = "response unknown ELS"; + break; + } + break; + case FC_TYPE_CT: + ct = fc_frame_payload_get(fp, sizeof(*ct)); + if (ct) { + switch (ntohs(ct->ct_cmd)) { + case FC_FS_ACC: + msg = "CT accept"; + break; + case FC_FS_RJT: + msg = "CT reject"; + break; + default: + msg = "response unknown CT"; + break; + } + } else { + msg = "short CT response"; + } + break; + default: + msg = "response not ELS or CT"; + break; + } + } + return msg; +} diff --git a/kernel/drivers/scsi/libfc/fc_exch.c b/kernel/drivers/scsi/libfc/fc_exch.c new file mode 100644 index 000000000..50af66a00 --- /dev/null +++ b/kernel/drivers/scsi/libfc/fc_exch.c @@ -0,0 +1,2631 @@ +/* + * Copyright(c) 2007 Intel Corporation. All rights reserved. + * Copyright(c) 2008 Red Hat, Inc. All rights reserved. + * Copyright(c) 2008 Mike Christie + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +/* + * Fibre Channel exchange and sequence handling. + */ + +#include <linux/timer.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/export.h> +#include <linux/log2.h> + +#include <scsi/fc/fc_fc2.h> + +#include <scsi/libfc.h> +#include <scsi/fc_encode.h> + +#include "fc_libfc.h" + +u16 fc_cpu_mask; /* cpu mask for possible cpus */ +EXPORT_SYMBOL(fc_cpu_mask); +static u16 fc_cpu_order; /* 2's power to represent total possible cpus */ +static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ +static struct workqueue_struct *fc_exch_workqueue; + +/* + * Structure and function definitions for managing Fibre Channel Exchanges + * and Sequences. + * + * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq. + * + * fc_exch_mgr holds the exchange state for an N port + * + * fc_exch holds state for one exchange and links to its active sequence. + * + * fc_seq holds the state for an individual sequence. + */ + +/** + * struct fc_exch_pool - Per cpu exchange pool + * @next_index: Next possible free exchange index + * @total_exches: Total allocated exchanges + * @lock: Exch pool lock + * @ex_list: List of exchanges + * + * This structure manages per cpu exchanges in array of exchange pointers. + * This array is allocated followed by struct fc_exch_pool memory for + * assigned range of exchanges to per cpu pool. + */ +struct fc_exch_pool { + spinlock_t lock; + struct list_head ex_list; + u16 next_index; + u16 total_exches; + + /* two cache of free slot in exch array */ + u16 left; + u16 right; +} ____cacheline_aligned_in_smp; + +/** + * struct fc_exch_mgr - The Exchange Manager (EM). + * @class: Default class for new sequences + * @kref: Reference counter + * @min_xid: Minimum exchange ID + * @max_xid: Maximum exchange ID + * @ep_pool: Reserved exchange pointers + * @pool_max_index: Max exch array index in exch pool + * @pool: Per cpu exch pool + * @stats: Statistics structure + * + * This structure is the center for creating exchanges and sequences. + * It manages the allocation of exchange IDs. + */ +struct fc_exch_mgr { + struct fc_exch_pool __percpu *pool; + mempool_t *ep_pool; + enum fc_class class; + struct kref kref; + u16 min_xid; + u16 max_xid; + u16 pool_max_index; + + struct { + atomic_t no_free_exch; + atomic_t no_free_exch_xid; + atomic_t xid_not_found; + atomic_t xid_busy; + atomic_t seq_not_found; + atomic_t non_bls_resp; + } stats; +}; + +/** + * struct fc_exch_mgr_anchor - primary structure for list of EMs + * @ema_list: Exchange Manager Anchor list + * @mp: Exchange Manager associated with this anchor + * @match: Routine to determine if this anchor's EM should be used + * + * When walking the list of anchors the match routine will be called + * for each anchor to determine if that EM should be used. The last + * anchor in the list will always match to handle any exchanges not + * handled by other EMs. The non-default EMs would be added to the + * anchor list by HW that provides offloads. + */ +struct fc_exch_mgr_anchor { + struct list_head ema_list; + struct fc_exch_mgr *mp; + bool (*match)(struct fc_frame *); +}; + +static void fc_exch_rrq(struct fc_exch *); +static void fc_seq_ls_acc(struct fc_frame *); +static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason, + enum fc_els_rjt_explan); +static void fc_exch_els_rec(struct fc_frame *); +static void fc_exch_els_rrq(struct fc_frame *); + +/* + * Internal implementation notes. + * + * The exchange manager is one by default in libfc but LLD may choose + * to have one per CPU. The sequence manager is one per exchange manager + * and currently never separated. + * + * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field + * assigned by the Sequence Initiator that shall be unique for a specific + * D_ID and S_ID pair while the Sequence is open." Note that it isn't + * qualified by exchange ID, which one might think it would be. + * In practice this limits the number of open sequences and exchanges to 256 + * per session. For most targets we could treat this limit as per exchange. + * + * The exchange and its sequence are freed when the last sequence is received. + * It's possible for the remote port to leave an exchange open without + * sending any sequences. + * + * Notes on reference counts: + * + * Exchanges are reference counted and exchange gets freed when the reference + * count becomes zero. + * + * Timeouts: + * Sequences are timed out for E_D_TOV and R_A_TOV. + * + * Sequence event handling: + * + * The following events may occur on initiator sequences: + * + * Send. + * For now, the whole thing is sent. + * Receive ACK + * This applies only to class F. + * The sequence is marked complete. + * ULP completion. + * The upper layer calls fc_exch_done() when done + * with exchange and sequence tuple. + * RX-inferred completion. + * When we receive the next sequence on the same exchange, we can + * retire the previous sequence ID. (XXX not implemented). + * Timeout. + * R_A_TOV frees the sequence ID. If we're waiting for ACK, + * E_D_TOV causes abort and calls upper layer response handler + * with FC_EX_TIMEOUT error. + * Receive RJT + * XXX defer. + * Send ABTS + * On timeout. + * + * The following events may occur on recipient sequences: + * + * Receive + * Allocate sequence for first frame received. + * Hold during receive handler. + * Release when final frame received. + * Keep status of last N of these for the ELS RES command. XXX TBD. + * Receive ABTS + * Deallocate sequence + * Send RJT + * Deallocate + * + * For now, we neglect conditions where only part of a sequence was + * received or transmitted, or where out-of-order receipt is detected. + */ + +/* + * Locking notes: + * + * The EM code run in a per-CPU worker thread. + * + * To protect against concurrency between a worker thread code and timers, + * sequence allocation and deallocation must be locked. + * - exchange refcnt can be done atomicly without locks. + * - sequence allocation must be locked by exch lock. + * - If the EM pool lock and ex_lock must be taken at the same time, then the + * EM pool lock must be taken before the ex_lock. + */ + +/* + * opcode names for debugging. + */ +static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; + +/** + * fc_exch_name_lookup() - Lookup name by opcode + * @op: Opcode to be looked up + * @table: Opcode/name table + * @max_index: Index not to be exceeded + * + * This routine is used to determine a human-readable string identifying + * a R_CTL opcode. + */ +static inline const char *fc_exch_name_lookup(unsigned int op, char **table, + unsigned int max_index) +{ + const char *name = NULL; + + if (op < max_index) + name = table[op]; + if (!name) + name = "unknown"; + return name; +} + +/** + * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup() + * @op: The opcode to be looked up + */ +static const char *fc_exch_rctl_name(unsigned int op) +{ + return fc_exch_name_lookup(op, fc_exch_rctl_names, + ARRAY_SIZE(fc_exch_rctl_names)); +} + +/** + * fc_exch_hold() - Increment an exchange's reference count + * @ep: Echange to be held + */ +static inline void fc_exch_hold(struct fc_exch *ep) +{ + atomic_inc(&ep->ex_refcnt); +} + +/** + * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields + * and determine SOF and EOF. + * @ep: The exchange to that will use the header + * @fp: The frame whose header is to be modified + * @f_ctl: F_CTL bits that will be used for the frame header + * + * The fields initialized by this routine are: fh_ox_id, fh_rx_id, + * fh_seq_id, fh_seq_cnt and the SOF and EOF. + */ +static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, + u32 f_ctl) +{ + struct fc_frame_header *fh = fc_frame_header_get(fp); + u16 fill; + + fr_sof(fp) = ep->class; + if (ep->seq.cnt) + fr_sof(fp) = fc_sof_normal(ep->class); + + if (f_ctl & FC_FC_END_SEQ) { + fr_eof(fp) = FC_EOF_T; + if (fc_sof_needs_ack(ep->class)) + fr_eof(fp) = FC_EOF_N; + /* + * From F_CTL. + * The number of fill bytes to make the length a 4-byte + * multiple is the low order 2-bits of the f_ctl. + * The fill itself will have been cleared by the frame + * allocation. + * After this, the length will be even, as expected by + * the transport. + */ + fill = fr_len(fp) & 3; + if (fill) { + fill = 4 - fill; + /* TODO, this may be a problem with fragmented skb */ + skb_put(fp_skb(fp), fill); + hton24(fh->fh_f_ctl, f_ctl | fill); + } + } else { + WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ + fr_eof(fp) = FC_EOF_N; + } + + /* Initialize remaining fh fields from fc_fill_fc_hdr */ + fh->fh_ox_id = htons(ep->oxid); + fh->fh_rx_id = htons(ep->rxid); + fh->fh_seq_id = ep->seq.id; + fh->fh_seq_cnt = htons(ep->seq.cnt); +} + +/** + * fc_exch_release() - Decrement an exchange's reference count + * @ep: Exchange to be released + * + * If the reference count reaches zero and the exchange is complete, + * it is freed. + */ +static void fc_exch_release(struct fc_exch *ep) +{ + struct fc_exch_mgr *mp; + + if (atomic_dec_and_test(&ep->ex_refcnt)) { + mp = ep->em; + if (ep->destructor) + ep->destructor(&ep->seq, ep->arg); + WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); + mempool_free(ep, mp->ep_pool); + } +} + +/** + * fc_exch_timer_cancel() - cancel exch timer + * @ep: The exchange whose timer to be canceled + */ +static inline void fc_exch_timer_cancel(struct fc_exch *ep) +{ + if (cancel_delayed_work(&ep->timeout_work)) { + FC_EXCH_DBG(ep, "Exchange timer canceled\n"); + atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ + } +} + +/** + * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the + * the exchange lock held + * @ep: The exchange whose timer will start + * @timer_msec: The timeout period + * + * Used for upper level protocols to time out the exchange. + * The timer is cancelled when it fires or when the exchange completes. + */ +static inline void fc_exch_timer_set_locked(struct fc_exch *ep, + unsigned int timer_msec) +{ + if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) + return; + + FC_EXCH_DBG(ep, "Exchange timer armed : %d msecs\n", timer_msec); + + fc_exch_hold(ep); /* hold for timer */ + if (!queue_delayed_work(fc_exch_workqueue, &ep->timeout_work, + msecs_to_jiffies(timer_msec))) + fc_exch_release(ep); +} + +/** + * fc_exch_timer_set() - Lock the exchange and set the timer + * @ep: The exchange whose timer will start + * @timer_msec: The timeout period + */ +static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) +{ + spin_lock_bh(&ep->ex_lock); + fc_exch_timer_set_locked(ep, timer_msec); + spin_unlock_bh(&ep->ex_lock); +} + +/** + * fc_exch_done_locked() - Complete an exchange with the exchange lock held + * @ep: The exchange that is complete + * + * Note: May sleep if invoked from outside a response handler. + */ +static int fc_exch_done_locked(struct fc_exch *ep) +{ + int rc = 1; + + /* + * We must check for completion in case there are two threads + * tyring to complete this. But the rrq code will reuse the + * ep, and in that case we only clear the resp and set it as + * complete, so it can be reused by the timer to send the rrq. + */ + if (ep->state & FC_EX_DONE) + return rc; + ep->esb_stat |= ESB_ST_COMPLETE; + + if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { + ep->state |= FC_EX_DONE; + fc_exch_timer_cancel(ep); + rc = 0; + } + return rc; +} + +/** + * fc_exch_ptr_get() - Return an exchange from an exchange pool + * @pool: Exchange Pool to get an exchange from + * @index: Index of the exchange within the pool + * + * Use the index to get an exchange from within an exchange pool. exches + * will point to an array of exchange pointers. The index will select + * the exchange within the array. + */ +static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, + u16 index) +{ + struct fc_exch **exches = (struct fc_exch **)(pool + 1); + return exches[index]; +} + +/** + * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool + * @pool: The pool to assign the exchange to + * @index: The index in the pool where the exchange will be assigned + * @ep: The exchange to assign to the pool + */ +static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index, + struct fc_exch *ep) +{ + ((struct fc_exch **)(pool + 1))[index] = ep; +} + +/** + * fc_exch_delete() - Delete an exchange + * @ep: The exchange to be deleted + */ +static void fc_exch_delete(struct fc_exch *ep) +{ + struct fc_exch_pool *pool; + u16 index; + + pool = ep->pool; + spin_lock_bh(&pool->lock); + WARN_ON(pool->total_exches <= 0); + pool->total_exches--; + + /* update cache of free slot */ + index = (ep->xid - ep->em->min_xid) >> fc_cpu_order; + if (pool->left == FC_XID_UNKNOWN) + pool->left = index; + else if (pool->right == FC_XID_UNKNOWN) + pool->right = index; + else + pool->next_index = index; + + fc_exch_ptr_set(pool, index, NULL); + list_del(&ep->ex_list); + spin_unlock_bh(&pool->lock); + fc_exch_release(ep); /* drop hold for exch in mp */ +} + +static int fc_seq_send_locked(struct fc_lport *lport, struct fc_seq *sp, + struct fc_frame *fp) +{ + struct fc_exch *ep; + struct fc_frame_header *fh = fc_frame_header_get(fp); + int error = -ENXIO; + u32 f_ctl; + u8 fh_type = fh->fh_type; + + ep = fc_seq_exch(sp); + + if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL)) { + fc_frame_free(fp); + goto out; + } + + WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT)); + + f_ctl = ntoh24(fh->fh_f_ctl); + fc_exch_setup_hdr(ep, fp, f_ctl); + fr_encaps(fp) = ep->encaps; + + /* + * update sequence count if this frame is carrying + * multiple FC frames when sequence offload is enabled + * by LLD. + */ + if (fr_max_payload(fp)) + sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), + fr_max_payload(fp)); + else + sp->cnt++; + + /* + * Send the frame. + */ + error = lport->tt.frame_send(lport, fp); + + if (fh_type == FC_TYPE_BLS) + goto out; + + /* + * Update the exchange and sequence flags, + * assuming all frames for the sequence have been sent. + * We can only be called to send once for each sequence. + */ + ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ + if (f_ctl & FC_FC_SEQ_INIT) + ep->esb_stat &= ~ESB_ST_SEQ_INIT; +out: + return error; +} + +/** + * fc_seq_send() - Send a frame using existing sequence/exchange pair + * @lport: The local port that the exchange will be sent on + * @sp: The sequence to be sent + * @fp: The frame to be sent on the exchange + * + * Note: The frame will be freed either by a direct call to fc_frame_free(fp) + * or indirectly by calling libfc_function_template.frame_send(). + */ +static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, + struct fc_frame *fp) +{ + struct fc_exch *ep; + int error; + ep = fc_seq_exch(sp); + spin_lock_bh(&ep->ex_lock); + error = fc_seq_send_locked(lport, sp, fp); + spin_unlock_bh(&ep->ex_lock); + return error; +} + +/** + * fc_seq_alloc() - Allocate a sequence for a given exchange + * @ep: The exchange to allocate a new sequence for + * @seq_id: The sequence ID to be used + * + * We don't support multiple originated sequences on the same exchange. + * By implication, any previously originated sequence on this exchange + * is complete, and we reallocate the same sequence. + */ +static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) +{ + struct fc_seq *sp; + + sp = &ep->seq; + sp->ssb_stat = 0; + sp->cnt = 0; + sp->id = seq_id; + return sp; +} + +/** + * fc_seq_start_next_locked() - Allocate a new sequence on the same + * exchange as the supplied sequence + * @sp: The sequence/exchange to get a new sequence for + */ +static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) +{ + struct fc_exch *ep = fc_seq_exch(sp); + + sp = fc_seq_alloc(ep, ep->seq_id++); + FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", + ep->f_ctl, sp->id); + return sp; +} + +/** + * fc_seq_start_next() - Lock the exchange and get a new sequence + * for a given sequence/exchange pair + * @sp: The sequence/exchange to get a new exchange for + */ +static struct fc_seq *fc_seq_start_next(struct fc_seq *sp) +{ + struct fc_exch *ep = fc_seq_exch(sp); + + spin_lock_bh(&ep->ex_lock); + sp = fc_seq_start_next_locked(sp); + spin_unlock_bh(&ep->ex_lock); + + return sp; +} + +/* + * Set the response handler for the exchange associated with a sequence. + * + * Note: May sleep if invoked from outside a response handler. + */ +static void fc_seq_set_resp(struct fc_seq *sp, + void (*resp)(struct fc_seq *, struct fc_frame *, + void *), + void *arg) +{ + struct fc_exch *ep = fc_seq_exch(sp); + DEFINE_WAIT(wait); + + spin_lock_bh(&ep->ex_lock); + while (ep->resp_active && ep->resp_task != current) { + prepare_to_wait(&ep->resp_wq, &wait, TASK_UNINTERRUPTIBLE); + spin_unlock_bh(&ep->ex_lock); + + schedule(); + + spin_lock_bh(&ep->ex_lock); + } + finish_wait(&ep->resp_wq, &wait); + ep->resp = resp; + ep->arg = arg; + spin_unlock_bh(&ep->ex_lock); +} + +/** + * fc_exch_abort_locked() - Abort an exchange + * @ep: The exchange to be aborted + * @timer_msec: The period of time to wait before aborting + * + * Locking notes: Called with exch lock held + * + * Return value: 0 on success else error code + */ +static int fc_exch_abort_locked(struct fc_exch *ep, + unsigned int timer_msec) +{ + struct fc_seq *sp; + struct fc_frame *fp; + int error; + + if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || + ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) + return -ENXIO; + + /* + * Send the abort on a new sequence if possible. + */ + sp = fc_seq_start_next_locked(&ep->seq); + if (!sp) + return -ENOMEM; + + if (timer_msec) + fc_exch_timer_set_locked(ep, timer_msec); + + if (ep->sid) { + /* + * Send an abort for the sequence that timed out. + */ + fp = fc_frame_alloc(ep->lp, 0); + if (fp) { + ep->esb_stat |= ESB_ST_SEQ_INIT; + fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, + FC_TYPE_BLS, FC_FC_END_SEQ | + FC_FC_SEQ_INIT, 0); + error = fc_seq_send_locked(ep->lp, sp, fp); + } else { + error = -ENOBUFS; + } + } else { + /* + * If not logged into the fabric, don't send ABTS but leave + * sequence active until next timeout. + */ + error = 0; + } + ep->esb_stat |= ESB_ST_ABNORMAL; + return error; +} + +/** + * fc_seq_exch_abort() - Abort an exchange and sequence + * @req_sp: The sequence to be aborted + * @timer_msec: The period of time to wait before aborting + * + * Generally called because of a timeout or an abort from the upper layer. + * + * Return value: 0 on success else error code + */ +static int fc_seq_exch_abort(const struct fc_seq *req_sp, + unsigned int timer_msec) +{ + struct fc_exch *ep; + int error; + + ep = fc_seq_exch(req_sp); + spin_lock_bh(&ep->ex_lock); + error = fc_exch_abort_locked(ep, timer_msec); + spin_unlock_bh(&ep->ex_lock); + return error; +} + +/** + * fc_invoke_resp() - invoke ep->resp() + * + * Notes: + * It is assumed that after initialization finished (this means the + * first unlock of ex_lock after fc_exch_alloc()) ep->resp and ep->arg are + * modified only via fc_seq_set_resp(). This guarantees that none of these + * two variables changes if ep->resp_active > 0. + * + * If an fc_seq_set_resp() call is busy modifying ep->resp and ep->arg when + * this function is invoked, the first spin_lock_bh() call in this function + * will wait until fc_seq_set_resp() has finished modifying these variables. + * + * Since fc_exch_done() invokes fc_seq_set_resp() it is guaranteed that that + * ep->resp() won't be invoked after fc_exch_done() has returned. + * + * The response handler itself may invoke fc_exch_done(), which will clear the + * ep->resp pointer. + * + * Return value: + * Returns true if and only if ep->resp has been invoked. + */ +static bool fc_invoke_resp(struct fc_exch *ep, struct fc_seq *sp, + struct fc_frame *fp) +{ + void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); + void *arg; + bool res = false; + + spin_lock_bh(&ep->ex_lock); + ep->resp_active++; + if (ep->resp_task != current) + ep->resp_task = !ep->resp_task ? current : NULL; + resp = ep->resp; + arg = ep->arg; + spin_unlock_bh(&ep->ex_lock); + + if (resp) { + resp(sp, fp, arg); + res = true; + } else if (!IS_ERR(fp)) { + fc_frame_free(fp); + } + + spin_lock_bh(&ep->ex_lock); + if (--ep->resp_active == 0) + ep->resp_task = NULL; + spin_unlock_bh(&ep->ex_lock); + + if (ep->resp_active == 0) + wake_up(&ep->resp_wq); + + return res; +} + +/** + * fc_exch_timeout() - Handle exchange timer expiration + * @work: The work_struct identifying the exchange that timed out + */ +static void fc_exch_timeout(struct work_struct *work) +{ + struct fc_exch *ep = container_of(work, struct fc_exch, + timeout_work.work); + struct fc_seq *sp = &ep->seq; + u32 e_stat; + int rc = 1; + + FC_EXCH_DBG(ep, "Exchange timed out\n"); + + spin_lock_bh(&ep->ex_lock); + if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) + goto unlock; + + e_stat = ep->esb_stat; + if (e_stat & ESB_ST_COMPLETE) { + ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; + spin_unlock_bh(&ep->ex_lock); + if (e_stat & ESB_ST_REC_QUAL) + fc_exch_rrq(ep); + goto done; + } else { + if (e_stat & ESB_ST_ABNORMAL) + rc = fc_exch_done_locked(ep); + spin_unlock_bh(&ep->ex_lock); + if (!rc) + fc_exch_delete(ep); + fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_TIMEOUT)); + fc_seq_set_resp(sp, NULL, ep->arg); + fc_seq_exch_abort(sp, 2 * ep->r_a_tov); + goto done; + } +unlock: + spin_unlock_bh(&ep->ex_lock); +done: + /* + * This release matches the hold taken when the timer was set. + */ + fc_exch_release(ep); +} + +/** + * fc_exch_em_alloc() - Allocate an exchange from a specified EM. + * @lport: The local port that the exchange is for + * @mp: The exchange manager that will allocate the exchange + * + * Returns pointer to allocated fc_exch with exch lock held. + */ +static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, + struct fc_exch_mgr *mp) +{ + struct fc_exch *ep; + unsigned int cpu; + u16 index; + struct fc_exch_pool *pool; + + /* allocate memory for exchange */ + ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); + if (!ep) { + atomic_inc(&mp->stats.no_free_exch); + goto out; + } + memset(ep, 0, sizeof(*ep)); + + cpu = get_cpu_light(); + pool = per_cpu_ptr(mp->pool, cpu); + spin_lock_bh(&pool->lock); + put_cpu_light(); + + /* peek cache of free slot */ + if (pool->left != FC_XID_UNKNOWN) { + index = pool->left; + pool->left = FC_XID_UNKNOWN; + goto hit; + } + if (pool->right != FC_XID_UNKNOWN) { + index = pool->right; + pool->right = FC_XID_UNKNOWN; + goto hit; + } + + index = pool->next_index; + /* allocate new exch from pool */ + while (fc_exch_ptr_get(pool, index)) { + index = index == mp->pool_max_index ? 0 : index + 1; + if (index == pool->next_index) + goto err; + } + pool->next_index = index == mp->pool_max_index ? 0 : index + 1; +hit: + fc_exch_hold(ep); /* hold for exch in mp */ + spin_lock_init(&ep->ex_lock); + /* + * Hold exch lock for caller to prevent fc_exch_reset() + * from releasing exch while fc_exch_alloc() caller is + * still working on exch. + */ + spin_lock_bh(&ep->ex_lock); + + fc_exch_ptr_set(pool, index, ep); + list_add_tail(&ep->ex_list, &pool->ex_list); + fc_seq_alloc(ep, ep->seq_id++); + pool->total_exches++; + spin_unlock_bh(&pool->lock); + + /* + * update exchange + */ + ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid; + ep->em = mp; + ep->pool = pool; + ep->lp = lport; + ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ + ep->rxid = FC_XID_UNKNOWN; + ep->class = mp->class; + ep->resp_active = 0; + init_waitqueue_head(&ep->resp_wq); + INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); +out: + return ep; +err: + spin_unlock_bh(&pool->lock); + atomic_inc(&mp->stats.no_free_exch_xid); + mempool_free(ep, mp->ep_pool); + return NULL; +} + +/** + * fc_exch_alloc() - Allocate an exchange from an EM on a + * local port's list of EMs. + * @lport: The local port that will own the exchange + * @fp: The FC frame that the exchange will be for + * + * This function walks the list of exchange manager(EM) + * anchors to select an EM for a new exchange allocation. The + * EM is selected when a NULL match function pointer is encountered + * or when a call to a match function returns true. + */ +static inline struct fc_exch *fc_exch_alloc(struct fc_lport *lport, + struct fc_frame *fp) +{ + struct fc_exch_mgr_anchor *ema; + + list_for_each_entry(ema, &lport->ema_list, ema_list) + if (!ema->match || ema->match(fp)) + return fc_exch_em_alloc(lport, ema->mp); + return NULL; +} + +/** + * fc_exch_find() - Lookup and hold an exchange + * @mp: The exchange manager to lookup the exchange from + * @xid: The XID of the exchange to look up + */ +static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) +{ + struct fc_exch_pool *pool; + struct fc_exch *ep = NULL; + + if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { + pool = per_cpu_ptr(mp->pool, xid & fc_cpu_mask); + spin_lock_bh(&pool->lock); + ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order); + if (ep) { + WARN_ON(ep->xid != xid); + fc_exch_hold(ep); + } + spin_unlock_bh(&pool->lock); + } + return ep; +} + + +/** + * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and + * the memory allocated for the related objects may be freed. + * @sp: The sequence that has completed + * + * Note: May sleep if invoked from outside a response handler. + */ +static void fc_exch_done(struct fc_seq *sp) +{ + struct fc_exch *ep = fc_seq_exch(sp); + int rc; + + spin_lock_bh(&ep->ex_lock); + rc = fc_exch_done_locked(ep); + spin_unlock_bh(&ep->ex_lock); + + fc_seq_set_resp(sp, NULL, ep->arg); + if (!rc) + fc_exch_delete(ep); +} + +/** + * fc_exch_resp() - Allocate a new exchange for a response frame + * @lport: The local port that the exchange was for + * @mp: The exchange manager to allocate the exchange from + * @fp: The response frame + * + * Sets the responder ID in the frame header. + */ +static struct fc_exch *fc_exch_resp(struct fc_lport *lport, + struct fc_exch_mgr *mp, + struct fc_frame *fp) +{ + struct fc_exch *ep; + struct fc_frame_header *fh; + + ep = fc_exch_alloc(lport, fp); + if (ep) { + ep->class = fc_frame_class(fp); + + /* + * Set EX_CTX indicating we're responding on this exchange. + */ + ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ + ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ + fh = fc_frame_header_get(fp); + ep->sid = ntoh24(fh->fh_d_id); + ep->did = ntoh24(fh->fh_s_id); + ep->oid = ep->did; + + /* + * Allocated exchange has placed the XID in the + * originator field. Move it to the responder field, + * and set the originator XID from the frame. + */ + ep->rxid = ep->xid; + ep->oxid = ntohs(fh->fh_ox_id); + ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; + if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) + ep->esb_stat &= ~ESB_ST_SEQ_INIT; + + fc_exch_hold(ep); /* hold for caller */ + spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ + } + return ep; +} + +/** + * fc_seq_lookup_recip() - Find a sequence where the other end + * originated the sequence + * @lport: The local port that the frame was sent to + * @mp: The Exchange Manager to lookup the exchange from + * @fp: The frame associated with the sequence we're looking for + * + * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold + * on the ep that should be released by the caller. + */ +static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, + struct fc_exch_mgr *mp, + struct fc_frame *fp) +{ + struct fc_frame_header *fh = fc_frame_header_get(fp); + struct fc_exch *ep = NULL; + struct fc_seq *sp = NULL; + enum fc_pf_rjt_reason reject = FC_RJT_NONE; + u32 f_ctl; + u16 xid; + + f_ctl = ntoh24(fh->fh_f_ctl); + WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); + + /* + * Lookup or create the exchange if we will be creating the sequence. + */ + if (f_ctl & FC_FC_EX_CTX) { + xid = ntohs(fh->fh_ox_id); /* we originated exch */ + ep = fc_exch_find(mp, xid); + if (!ep) { + atomic_inc(&mp->stats.xid_not_found); + reject = FC_RJT_OX_ID; + goto out; + } + if (ep->rxid == FC_XID_UNKNOWN) + ep->rxid = ntohs(fh->fh_rx_id); + else if (ep->rxid != ntohs(fh->fh_rx_id)) { + reject = FC_RJT_OX_ID; + goto rel; + } + } else { + xid = ntohs(fh->fh_rx_id); /* we are the responder */ + + /* + * Special case for MDS issuing an ELS TEST with a + * bad rxid of 0. + * XXX take this out once we do the proper reject. + */ + if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && + fc_frame_payload_op(fp) == ELS_TEST) { + fh->fh_rx_id = htons(FC_XID_UNKNOWN); + xid = FC_XID_UNKNOWN; + } + + /* + * new sequence - find the exchange + */ + ep = fc_exch_find(mp, xid); + if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { + if (ep) { + atomic_inc(&mp->stats.xid_busy); + reject = FC_RJT_RX_ID; + goto rel; + } + ep = fc_exch_resp(lport, mp, fp); + if (!ep) { + reject = FC_RJT_EXCH_EST; /* XXX */ + goto out; + } + xid = ep->xid; /* get our XID */ + } else if (!ep) { + atomic_inc(&mp->stats.xid_not_found); + reject = FC_RJT_RX_ID; /* XID not found */ + goto out; + } + } + + spin_lock_bh(&ep->ex_lock); + /* + * At this point, we have the exchange held. + * Find or create the sequence. + */ + if (fc_sof_is_init(fr_sof(fp))) { + sp = &ep->seq; + sp->ssb_stat |= SSB_ST_RESP; + sp->id = fh->fh_seq_id; + } else { + sp = &ep->seq; + if (sp->id != fh->fh_seq_id) { + atomic_inc(&mp->stats.seq_not_found); + if (f_ctl & FC_FC_END_SEQ) { + /* + * Update sequence_id based on incoming last + * frame of sequence exchange. This is needed + * for FC target where DDP has been used + * on target where, stack is indicated only + * about last frame's (payload _header) header. + * Whereas "seq_id" which is part of + * frame_header is allocated by initiator + * which is totally different from "seq_id" + * allocated when XFER_RDY was sent by target. + * To avoid false -ve which results into not + * sending RSP, hence write request on other + * end never finishes. + */ + sp->ssb_stat |= SSB_ST_RESP; + sp->id = fh->fh_seq_id; + } else { + spin_unlock_bh(&ep->ex_lock); + + /* sequence/exch should exist */ + reject = FC_RJT_SEQ_ID; + goto rel; + } + } + } + WARN_ON(ep != fc_seq_exch(sp)); + + if (f_ctl & FC_FC_SEQ_INIT) + ep->esb_stat |= ESB_ST_SEQ_INIT; + spin_unlock_bh(&ep->ex_lock); + + fr_seq(fp) = sp; +out: + return reject; +rel: + fc_exch_done(&ep->seq); + fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ + return reject; +} + +/** + * fc_seq_lookup_orig() - Find a sequence where this end + * originated the sequence + * @mp: The Exchange Manager to lookup the exchange from + * @fp: The frame associated with the sequence we're looking for + * + * Does not hold the sequence for the caller. + */ +static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, + struct fc_frame *fp) +{ + struct fc_frame_header *fh = fc_frame_header_get(fp); + struct fc_exch *ep; + struct fc_seq *sp = NULL; + u32 f_ctl; + u16 xid; + + f_ctl = ntoh24(fh->fh_f_ctl); + WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); + xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); + ep = fc_exch_find(mp, xid); + if (!ep) + return NULL; + if (ep->seq.id == fh->fh_seq_id) { + /* + * Save the RX_ID if we didn't previously know it. + */ + sp = &ep->seq; + if ((f_ctl & FC_FC_EX_CTX) != 0 && + ep->rxid == FC_XID_UNKNOWN) { + ep->rxid = ntohs(fh->fh_rx_id); + } + } + fc_exch_release(ep); + return sp; +} + +/** + * fc_exch_set_addr() - Set the source and destination IDs for an exchange + * @ep: The exchange to set the addresses for + * @orig_id: The originator's ID + * @resp_id: The responder's ID + * + * Note this must be done before the first sequence of the exchange is sent. + */ +static void fc_exch_set_addr(struct fc_exch *ep, + u32 orig_id, u32 resp_id) +{ + ep->oid = orig_id; + if (ep->esb_stat & ESB_ST_RESP) { + ep->sid = resp_id; + ep->did = orig_id; + } else { + ep->sid = orig_id; + ep->did = resp_id; + } +} + +/** + * fc_seq_els_rsp_send() - Send an ELS response using information from + * the existing sequence/exchange. + * @fp: The received frame + * @els_cmd: The ELS command to be sent + * @els_data: The ELS data to be sent + * + * The received frame is not freed. + */ +static void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd, + struct fc_seq_els_data *els_data) +{ + switch (els_cmd) { + case ELS_LS_RJT: + fc_seq_ls_rjt(fp, els_data->reason, els_data->explan); + break; + case ELS_LS_ACC: + fc_seq_ls_acc(fp); + break; + case ELS_RRQ: + fc_exch_els_rrq(fp); + break; + case ELS_REC: + fc_exch_els_rec(fp); + break; + default: + FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd); + } +} + +/** + * fc_seq_send_last() - Send a sequence that is the last in the exchange + * @sp: The sequence that is to be sent + * @fp: The frame that will be sent on the sequence + * @rctl: The R_CTL information to be sent + * @fh_type: The frame header type + */ +static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, + enum fc_rctl rctl, enum fc_fh_type fh_type) +{ + u32 f_ctl; + struct fc_exch *ep = fc_seq_exch(sp); + + f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; + f_ctl |= ep->f_ctl; + fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); + fc_seq_send_locked(ep->lp, sp, fp); +} + +/** + * fc_seq_send_ack() - Send an acknowledgement that we've received a frame + * @sp: The sequence to send the ACK on + * @rx_fp: The received frame that is being acknoledged + * + * Send ACK_1 (or equiv.) indicating we received something. + */ +static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) +{ + struct fc_frame *fp; + struct fc_frame_header *rx_fh; + struct fc_frame_header *fh; + struct fc_exch *ep = fc_seq_exch(sp); + struct fc_lport *lport = ep->lp; + unsigned int f_ctl; + + /* + * Don't send ACKs for class 3. + */ + if (fc_sof_needs_ack(fr_sof(rx_fp))) { + fp = fc_frame_alloc(lport, 0); + if (!fp) + return; + + fh = fc_frame_header_get(fp); + fh->fh_r_ctl = FC_RCTL_ACK_1; + fh->fh_type = FC_TYPE_BLS; + + /* + * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). + * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. + * Bits 9-8 are meaningful (retransmitted or unidirectional). + * Last ACK uses bits 7-6 (continue sequence), + * bits 5-4 are meaningful (what kind of ACK to use). + */ + rx_fh = fc_frame_header_get(rx_fp); + f_ctl = ntoh24(rx_fh->fh_f_ctl); + f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | + FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | + FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | + FC_FC_RETX_SEQ | FC_FC_UNI_TX; + f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; + hton24(fh->fh_f_ctl, f_ctl); + + fc_exch_setup_hdr(ep, fp, f_ctl); + fh->fh_seq_id = rx_fh->fh_seq_id; + fh->fh_seq_cnt = rx_fh->fh_seq_cnt; + fh->fh_parm_offset = htonl(1); /* ack single frame */ + + fr_sof(fp) = fr_sof(rx_fp); + if (f_ctl & FC_FC_END_SEQ) + fr_eof(fp) = FC_EOF_T; + else + fr_eof(fp) = FC_EOF_N; + + lport->tt.frame_send(lport, fp); + } +} + +/** + * fc_exch_send_ba_rjt() - Send BLS Reject + * @rx_fp: The frame being rejected + * @reason: The reason the frame is being rejected + * @explan: The explanation for the rejection + * + * This is for rejecting BA_ABTS only. + */ +static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, + enum fc_ba_rjt_reason reason, + enum fc_ba_rjt_explan explan) +{ + struct fc_frame *fp; + struct fc_frame_header *rx_fh; + struct fc_frame_header *fh; + struct fc_ba_rjt *rp; + struct fc_lport *lport; + unsigned int f_ctl; + + lport = fr_dev(rx_fp); + fp = fc_frame_alloc(lport, sizeof(*rp)); + if (!fp) + return; + fh = fc_frame_header_get(fp); + rx_fh = fc_frame_header_get(rx_fp); + + memset(fh, 0, sizeof(*fh) + sizeof(*rp)); + + rp = fc_frame_payload_get(fp, sizeof(*rp)); + rp->br_reason = reason; + rp->br_explan = explan; + + /* + * seq_id, cs_ctl, df_ctl and param/offset are zero. + */ + memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); + memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); + fh->fh_ox_id = rx_fh->fh_ox_id; + fh->fh_rx_id = rx_fh->fh_rx_id; + fh->fh_seq_cnt = rx_fh->fh_seq_cnt; + fh->fh_r_ctl = FC_RCTL_BA_RJT; + fh->fh_type = FC_TYPE_BLS; + + /* + * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). + * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. + * Bits 9-8 are meaningful (retransmitted or unidirectional). + * Last ACK uses bits 7-6 (continue sequence), + * bits 5-4 are meaningful (what kind of ACK to use). + * Always set LAST_SEQ, END_SEQ. + */ + f_ctl = ntoh24(rx_fh->fh_f_ctl); + f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | + FC_FC_END_CONN | FC_FC_SEQ_INIT | + FC_FC_RETX_SEQ | FC_FC_UNI_TX; + f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; + f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; + f_ctl &= ~FC_FC_FIRST_SEQ; + hton24(fh->fh_f_ctl, f_ctl); + + fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); + fr_eof(fp) = FC_EOF_T; + if (fc_sof_needs_ack(fr_sof(fp))) + fr_eof(fp) = FC_EOF_N; + + lport->tt.frame_send(lport, fp); +} + +/** + * fc_exch_recv_abts() - Handle an incoming ABTS + * @ep: The exchange the abort was on + * @rx_fp: The ABTS frame + * + * This would be for target mode usually, but could be due to lost + * FCP transfer ready, confirm or RRQ. We always handle this as an + * exchange abort, ignoring the parameter. + */ +static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) +{ + struct fc_frame *fp; + struct fc_ba_acc *ap; + struct fc_frame_header *fh; + struct fc_seq *sp; + + if (!ep) + goto reject; + + fp = fc_frame_alloc(ep->lp, sizeof(*ap)); + if (!fp) + goto free; + + spin_lock_bh(&ep->ex_lock); + if (ep->esb_stat & ESB_ST_COMPLETE) { + spin_unlock_bh(&ep->ex_lock); + + fc_frame_free(fp); + goto reject; + } + if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { + ep->esb_stat |= ESB_ST_REC_QUAL; + fc_exch_hold(ep); /* hold for REC_QUAL */ + } + fc_exch_timer_set_locked(ep, ep->r_a_tov); + fh = fc_frame_header_get(fp); + ap = fc_frame_payload_get(fp, sizeof(*ap)); + memset(ap, 0, sizeof(*ap)); + sp = &ep->seq; + ap->ba_high_seq_cnt = htons(0xffff); + if (sp->ssb_stat & SSB_ST_RESP) { + ap->ba_seq_id = sp->id; + ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; + ap->ba_high_seq_cnt = fh->fh_seq_cnt; + ap->ba_low_seq_cnt = htons(sp->cnt); + } + sp = fc_seq_start_next_locked(sp); + fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); + ep->esb_stat |= ESB_ST_ABNORMAL; + spin_unlock_bh(&ep->ex_lock); + +free: + fc_frame_free(rx_fp); + return; + +reject: + fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); + goto free; +} + +/** + * fc_seq_assign() - Assign exchange and sequence for incoming request + * @lport: The local port that received the request + * @fp: The request frame + * + * On success, the sequence pointer will be returned and also in fr_seq(@fp). + * A reference will be held on the exchange/sequence for the caller, which + * must call fc_seq_release(). + */ +static struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp) +{ + struct fc_exch_mgr_anchor *ema; + + WARN_ON(lport != fr_dev(fp)); + WARN_ON(fr_seq(fp)); + fr_seq(fp) = NULL; + + list_for_each_entry(ema, &lport->ema_list, ema_list) + if ((!ema->match || ema->match(fp)) && + fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE) + break; + return fr_seq(fp); +} + +/** + * fc_seq_release() - Release the hold + * @sp: The sequence. + */ +static void fc_seq_release(struct fc_seq *sp) +{ + fc_exch_release(fc_seq_exch(sp)); +} + +/** + * fc_exch_recv_req() - Handler for an incoming request + * @lport: The local port that received the request + * @mp: The EM that the exchange is on + * @fp: The request frame + * + * This is used when the other end is originating the exchange + * and the sequence. + */ +static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp, + struct fc_frame *fp) +{ + struct fc_frame_header *fh = fc_frame_header_get(fp); + struct fc_seq *sp = NULL; + struct fc_exch *ep = NULL; + enum fc_pf_rjt_reason reject; + + /* We can have the wrong fc_lport at this point with NPIV, which is a + * problem now that we know a new exchange needs to be allocated + */ + lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id)); + if (!lport) { + fc_frame_free(fp); + return; + } + fr_dev(fp) = lport; + + BUG_ON(fr_seq(fp)); /* XXX remove later */ + + /* + * If the RX_ID is 0xffff, don't allocate an exchange. + * The upper-level protocol may request one later, if needed. + */ + if (fh->fh_rx_id == htons(FC_XID_UNKNOWN)) + return lport->tt.lport_recv(lport, fp); + + reject = fc_seq_lookup_recip(lport, mp, fp); + if (reject == FC_RJT_NONE) { + sp = fr_seq(fp); /* sequence will be held */ + ep = fc_seq_exch(sp); + fc_seq_send_ack(sp, fp); + ep->encaps = fr_encaps(fp); + + /* + * Call the receive function. + * + * The receive function may allocate a new sequence + * over the old one, so we shouldn't change the + * sequence after this. + * + * The frame will be freed by the receive function. + * If new exch resp handler is valid then call that + * first. + */ + if (!fc_invoke_resp(ep, sp, fp)) + lport->tt.lport_recv(lport, fp); + fc_exch_release(ep); /* release from lookup */ + } else { + FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n", + reject); + fc_frame_free(fp); + } +} + +/** + * fc_exch_recv_seq_resp() - Handler for an incoming response where the other + * end is the originator of the sequence that is a + * response to our initial exchange + * @mp: The EM that the exchange is on + * @fp: The response frame + */ +static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) +{ + struct fc_frame_header *fh = fc_frame_header_get(fp); + struct fc_seq *sp; + struct fc_exch *ep; + enum fc_sof sof; + u32 f_ctl; + int rc; + + ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); + if (!ep) { + atomic_inc(&mp->stats.xid_not_found); + goto out; + } + if (ep->esb_stat & ESB_ST_COMPLETE) { + atomic_inc(&mp->stats.xid_not_found); + goto rel; + } + if (ep->rxid == FC_XID_UNKNOWN) + ep->rxid = ntohs(fh->fh_rx_id); + if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { + atomic_inc(&mp->stats.xid_not_found); + goto rel; + } + if (ep->did != ntoh24(fh->fh_s_id) && + ep->did != FC_FID_FLOGI) { + atomic_inc(&mp->stats.xid_not_found); + goto rel; + } + sof = fr_sof(fp); + sp = &ep->seq; + if (fc_sof_is_init(sof)) { + sp->ssb_stat |= SSB_ST_RESP; + sp->id = fh->fh_seq_id; + } else if (sp->id != fh->fh_seq_id) { + atomic_inc(&mp->stats.seq_not_found); + goto rel; + } + + f_ctl = ntoh24(fh->fh_f_ctl); + fr_seq(fp) = sp; + + spin_lock_bh(&ep->ex_lock); + if (f_ctl & FC_FC_SEQ_INIT) + ep->esb_stat |= ESB_ST_SEQ_INIT; + spin_unlock_bh(&ep->ex_lock); + + if (fc_sof_needs_ack(sof)) + fc_seq_send_ack(sp, fp); + + if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && + (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == + (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { + spin_lock_bh(&ep->ex_lock); + rc = fc_exch_done_locked(ep); + WARN_ON(fc_seq_exch(sp) != ep); + spin_unlock_bh(&ep->ex_lock); + if (!rc) + fc_exch_delete(ep); + } + + /* + * Call the receive function. + * The sequence is held (has a refcnt) for us, + * but not for the receive function. + * + * The receive function may allocate a new sequence + * over the old one, so we shouldn't change the + * sequence after this. + * + * The frame will be freed by the receive function. + * If new exch resp handler is valid then call that + * first. + */ + fc_invoke_resp(ep, sp, fp); + + fc_exch_release(ep); + return; +rel: + fc_exch_release(ep); +out: + fc_frame_free(fp); +} + +/** + * fc_exch_recv_resp() - Handler for a sequence where other end is + * responding to our sequence + * @mp: The EM that the exchange is on + * @fp: The response frame + */ +static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) +{ + struct fc_seq *sp; + + sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ + + if (!sp) + atomic_inc(&mp->stats.xid_not_found); + else + atomic_inc(&mp->stats.non_bls_resp); + + fc_frame_free(fp); +} + +/** + * fc_exch_abts_resp() - Handler for a response to an ABT + * @ep: The exchange that the frame is on + * @fp: The response frame + * + * This response would be to an ABTS cancelling an exchange or sequence. + * The response can be either BA_ACC or BA_RJT + */ +static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) +{ + struct fc_frame_header *fh; + struct fc_ba_acc *ap; + struct fc_seq *sp; + u16 low; + u16 high; + int rc = 1, has_rec = 0; + + fh = fc_frame_header_get(fp); + FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, + fc_exch_rctl_name(fh->fh_r_ctl)); + + if (cancel_delayed_work_sync(&ep->timeout_work)) { + FC_EXCH_DBG(ep, "Exchange timer canceled due to ABTS response\n"); + fc_exch_release(ep); /* release from pending timer hold */ + } + + spin_lock_bh(&ep->ex_lock); + switch (fh->fh_r_ctl) { + case FC_RCTL_BA_ACC: + ap = fc_frame_payload_get(fp, sizeof(*ap)); + if (!ap) + break; + + /* + * Decide whether to establish a Recovery Qualifier. + * We do this if there is a non-empty SEQ_CNT range and + * SEQ_ID is the same as the one we aborted. + */ + low = ntohs(ap->ba_low_seq_cnt); + high = ntohs(ap->ba_high_seq_cnt); + if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && + (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || + ap->ba_seq_id == ep->seq_id) && low != high) { + ep->esb_stat |= ESB_ST_REC_QUAL; + fc_exch_hold(ep); /* hold for recovery qualifier */ + has_rec = 1; + } + break; + case FC_RCTL_BA_RJT: + break; + default: + break; + } + + /* do we need to do some other checks here. Can we reuse more of + * fc_exch_recv_seq_resp + */ + sp = &ep->seq; + /* + * do we want to check END_SEQ as well as LAST_SEQ here? + */ + if (ep->fh_type != FC_TYPE_FCP && + ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) + rc = fc_exch_done_locked(ep); + spin_unlock_bh(&ep->ex_lock); + + fc_exch_hold(ep); + if (!rc) + fc_exch_delete(ep); + fc_invoke_resp(ep, sp, fp); + if (has_rec) + fc_exch_timer_set(ep, ep->r_a_tov); + fc_exch_release(ep); +} + +/** + * fc_exch_recv_bls() - Handler for a BLS sequence + * @mp: The EM that the exchange is on + * @fp: The request frame + * + * The BLS frame is always a sequence initiated by the remote side. + * We may be either the originator or recipient of the exchange. + */ +static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) +{ + struct fc_frame_header *fh; + struct fc_exch *ep; + u32 f_ctl; + + fh = fc_frame_header_get(fp); + f_ctl = ntoh24(fh->fh_f_ctl); + fr_seq(fp) = NULL; + + ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? + ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); + if (ep && (f_ctl & FC_FC_SEQ_INIT)) { + spin_lock_bh(&ep->ex_lock); + ep->esb_stat |= ESB_ST_SEQ_INIT; + spin_unlock_bh(&ep->ex_lock); + } + if (f_ctl & FC_FC_SEQ_CTX) { + /* + * A response to a sequence we initiated. + * This should only be ACKs for class 2 or F. + */ + switch (fh->fh_r_ctl) { + case FC_RCTL_ACK_1: + case FC_RCTL_ACK_0: + break; + default: + if (ep) + FC_EXCH_DBG(ep, "BLS rctl %x - %s received\n", + fh->fh_r_ctl, + fc_exch_rctl_name(fh->fh_r_ctl)); + break; + } + fc_frame_free(fp); + } else { + switch (fh->fh_r_ctl) { + case FC_RCTL_BA_RJT: + case FC_RCTL_BA_ACC: + if (ep) + fc_exch_abts_resp(ep, fp); + else + fc_frame_free(fp); + break; + case FC_RCTL_BA_ABTS: + fc_exch_recv_abts(ep, fp); + break; + default: /* ignore junk */ + fc_frame_free(fp); + break; + } + } + if (ep) + fc_exch_release(ep); /* release hold taken by fc_exch_find */ +} + +/** + * fc_seq_ls_acc() - Accept sequence with LS_ACC + * @rx_fp: The received frame, not freed here. + * + * If this fails due to allocation or transmit congestion, assume the + * originator will repeat the sequence. + */ +static void fc_seq_ls_acc(struct fc_frame *rx_fp) +{ + struct fc_lport *lport; + struct fc_els_ls_acc *acc; + struct fc_frame *fp; + + lport = fr_dev(rx_fp); + fp = fc_frame_alloc(lport, sizeof(*acc)); + if (!fp) + return; + acc = fc_frame_payload_get(fp, sizeof(*acc)); + memset(acc, 0, sizeof(*acc)); + acc->la_cmd = ELS_LS_ACC; + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); +} + +/** + * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT + * @rx_fp: The received frame, not freed here. + * @reason: The reason the sequence is being rejected + * @explan: The explanation for the rejection + * + * If this fails due to allocation or transmit congestion, assume the + * originator will repeat the sequence. + */ +static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason, + enum fc_els_rjt_explan explan) +{ + struct fc_lport *lport; + struct fc_els_ls_rjt *rjt; + struct fc_frame *fp; + + lport = fr_dev(rx_fp); + fp = fc_frame_alloc(lport, sizeof(*rjt)); + if (!fp) + return; + rjt = fc_frame_payload_get(fp, sizeof(*rjt)); + memset(rjt, 0, sizeof(*rjt)); + rjt->er_cmd = ELS_LS_RJT; + rjt->er_reason = reason; + rjt->er_explan = explan; + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); +} + +/** + * fc_exch_reset() - Reset an exchange + * @ep: The exchange to be reset + * + * Note: May sleep if invoked from outside a response handler. + */ +static void fc_exch_reset(struct fc_exch *ep) +{ + struct fc_seq *sp; + int rc = 1; + + spin_lock_bh(&ep->ex_lock); + fc_exch_abort_locked(ep, 0); + ep->state |= FC_EX_RST_CLEANUP; + fc_exch_timer_cancel(ep); + if (ep->esb_stat & ESB_ST_REC_QUAL) + atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ + ep->esb_stat &= ~ESB_ST_REC_QUAL; + sp = &ep->seq; + rc = fc_exch_done_locked(ep); + spin_unlock_bh(&ep->ex_lock); + + fc_exch_hold(ep); + + if (!rc) + fc_exch_delete(ep); + + fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_CLOSED)); + fc_seq_set_resp(sp, NULL, ep->arg); + fc_exch_release(ep); +} + +/** + * fc_exch_pool_reset() - Reset a per cpu exchange pool + * @lport: The local port that the exchange pool is on + * @pool: The exchange pool to be reset + * @sid: The source ID + * @did: The destination ID + * + * Resets a per cpu exches pool, releasing all of its sequences + * and exchanges. If sid is non-zero then reset only exchanges + * we sourced from the local port's FID. If did is non-zero then + * only reset exchanges destined for the local port's FID. + */ +static void fc_exch_pool_reset(struct fc_lport *lport, + struct fc_exch_pool *pool, + u32 sid, u32 did) +{ + struct fc_exch *ep; + struct fc_exch *next; + + spin_lock_bh(&pool->lock); +restart: + list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) { + if ((lport == ep->lp) && + (sid == 0 || sid == ep->sid) && + (did == 0 || did == ep->did)) { + fc_exch_hold(ep); + spin_unlock_bh(&pool->lock); + + fc_exch_reset(ep); + + fc_exch_release(ep); + spin_lock_bh(&pool->lock); + + /* + * must restart loop incase while lock + * was down multiple eps were released. + */ + goto restart; + } + } + pool->next_index = 0; + pool->left = FC_XID_UNKNOWN; + pool->right = FC_XID_UNKNOWN; + spin_unlock_bh(&pool->lock); +} + +/** + * fc_exch_mgr_reset() - Reset all EMs of a local port + * @lport: The local port whose EMs are to be reset + * @sid: The source ID + * @did: The destination ID + * + * Reset all EMs associated with a given local port. Release all + * sequences and exchanges. If sid is non-zero then reset only the + * exchanges sent from the local port's FID. If did is non-zero then + * reset only exchanges destined for the local port's FID. + */ +void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) +{ + struct fc_exch_mgr_anchor *ema; + unsigned int cpu; + + list_for_each_entry(ema, &lport->ema_list, ema_list) { + for_each_possible_cpu(cpu) + fc_exch_pool_reset(lport, + per_cpu_ptr(ema->mp->pool, cpu), + sid, did); + } +} +EXPORT_SYMBOL(fc_exch_mgr_reset); + +/** + * fc_exch_lookup() - find an exchange + * @lport: The local port + * @xid: The exchange ID + * + * Returns exchange pointer with hold for caller, or NULL if not found. + */ +static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid) +{ + struct fc_exch_mgr_anchor *ema; + + list_for_each_entry(ema, &lport->ema_list, ema_list) + if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid) + return fc_exch_find(ema->mp, xid); + return NULL; +} + +/** + * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests + * @rfp: The REC frame, not freed here. + * + * Note that the requesting port may be different than the S_ID in the request. + */ +static void fc_exch_els_rec(struct fc_frame *rfp) +{ + struct fc_lport *lport; + struct fc_frame *fp; + struct fc_exch *ep; + struct fc_els_rec *rp; + struct fc_els_rec_acc *acc; + enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; + enum fc_els_rjt_explan explan; + u32 sid; + u16 rxid; + u16 oxid; + + lport = fr_dev(rfp); + rp = fc_frame_payload_get(rfp, sizeof(*rp)); + explan = ELS_EXPL_INV_LEN; + if (!rp) + goto reject; + sid = ntoh24(rp->rec_s_id); + rxid = ntohs(rp->rec_rx_id); + oxid = ntohs(rp->rec_ox_id); + + ep = fc_exch_lookup(lport, + sid == fc_host_port_id(lport->host) ? oxid : rxid); + explan = ELS_EXPL_OXID_RXID; + if (!ep) + goto reject; + if (ep->oid != sid || oxid != ep->oxid) + goto rel; + if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid) + goto rel; + fp = fc_frame_alloc(lport, sizeof(*acc)); + if (!fp) + goto out; + + acc = fc_frame_payload_get(fp, sizeof(*acc)); + memset(acc, 0, sizeof(*acc)); + acc->reca_cmd = ELS_LS_ACC; + acc->reca_ox_id = rp->rec_ox_id; + memcpy(acc->reca_ofid, rp->rec_s_id, 3); + acc->reca_rx_id = htons(ep->rxid); + if (ep->sid == ep->oid) + hton24(acc->reca_rfid, ep->did); + else + hton24(acc->reca_rfid, ep->sid); + acc->reca_fc4value = htonl(ep->seq.rec_data); + acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | + ESB_ST_SEQ_INIT | + ESB_ST_COMPLETE)); + fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); +out: + fc_exch_release(ep); + return; + +rel: + fc_exch_release(ep); +reject: + fc_seq_ls_rjt(rfp, reason, explan); +} + +/** + * fc_exch_rrq_resp() - Handler for RRQ responses + * @sp: The sequence that the RRQ is on + * @fp: The RRQ frame + * @arg: The exchange that the RRQ is on + * + * TODO: fix error handler. + */ +static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) +{ + struct fc_exch *aborted_ep = arg; + unsigned int op; + + if (IS_ERR(fp)) { + int err = PTR_ERR(fp); + + if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) + goto cleanup; + FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " + "frame error %d\n", err); + return; + } + + op = fc_frame_payload_op(fp); + fc_frame_free(fp); + + switch (op) { + case ELS_LS_RJT: + FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ\n"); + /* fall through */ + case ELS_LS_ACC: + goto cleanup; + default: + FC_EXCH_DBG(aborted_ep, "unexpected response op %x for RRQ\n", + op); + return; + } + +cleanup: + fc_exch_done(&aborted_ep->seq); + /* drop hold for rec qual */ + fc_exch_release(aborted_ep); +} + + +/** + * fc_exch_seq_send() - Send a frame using a new exchange and sequence + * @lport: The local port to send the frame on + * @fp: The frame to be sent + * @resp: The response handler for this request + * @destructor: The destructor for the exchange + * @arg: The argument to be passed to the response handler + * @timer_msec: The timeout period for the exchange + * + * The frame pointer with some of the header's fields must be + * filled before calling this routine, those fields are: + * + * - routing control + * - FC port did + * - FC port sid + * - FC header type + * - frame control + * - parameter or relative offset + */ +static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, + struct fc_frame *fp, + void (*resp)(struct fc_seq *, + struct fc_frame *fp, + void *arg), + void (*destructor)(struct fc_seq *, + void *), + void *arg, u32 timer_msec) +{ + struct fc_exch *ep; + struct fc_seq *sp = NULL; + struct fc_frame_header *fh; + struct fc_fcp_pkt *fsp = NULL; + int rc = 1; + + ep = fc_exch_alloc(lport, fp); + if (!ep) { + fc_frame_free(fp); + return NULL; + } + ep->esb_stat |= ESB_ST_SEQ_INIT; + fh = fc_frame_header_get(fp); + fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); + ep->resp = resp; + ep->destructor = destructor; + ep->arg = arg; + ep->r_a_tov = FC_DEF_R_A_TOV; + ep->lp = lport; + sp = &ep->seq; + + ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ + ep->f_ctl = ntoh24(fh->fh_f_ctl); + fc_exch_setup_hdr(ep, fp, ep->f_ctl); + sp->cnt++; + + if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) { + fsp = fr_fsp(fp); + fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); + } + + if (unlikely(lport->tt.frame_send(lport, fp))) + goto err; + + if (timer_msec) + fc_exch_timer_set_locked(ep, timer_msec); + ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ + + if (ep->f_ctl & FC_FC_SEQ_INIT) + ep->esb_stat &= ~ESB_ST_SEQ_INIT; + spin_unlock_bh(&ep->ex_lock); + return sp; +err: + if (fsp) + fc_fcp_ddp_done(fsp); + rc = fc_exch_done_locked(ep); + spin_unlock_bh(&ep->ex_lock); + if (!rc) + fc_exch_delete(ep); + return NULL; +} + +/** + * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command + * @ep: The exchange to send the RRQ on + * + * This tells the remote port to stop blocking the use of + * the exchange and the seq_cnt range. + */ +static void fc_exch_rrq(struct fc_exch *ep) +{ + struct fc_lport *lport; + struct fc_els_rrq *rrq; + struct fc_frame *fp; + u32 did; + + lport = ep->lp; + + fp = fc_frame_alloc(lport, sizeof(*rrq)); + if (!fp) + goto retry; + + rrq = fc_frame_payload_get(fp, sizeof(*rrq)); + memset(rrq, 0, sizeof(*rrq)); + rrq->rrq_cmd = ELS_RRQ; + hton24(rrq->rrq_s_id, ep->sid); + rrq->rrq_ox_id = htons(ep->oxid); + rrq->rrq_rx_id = htons(ep->rxid); + + did = ep->did; + if (ep->esb_stat & ESB_ST_RESP) + did = ep->sid; + + fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, + lport->port_id, FC_TYPE_ELS, + FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); + + if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep, + lport->e_d_tov)) + return; + +retry: + spin_lock_bh(&ep->ex_lock); + if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { + spin_unlock_bh(&ep->ex_lock); + /* drop hold for rec qual */ + fc_exch_release(ep); + return; + } + ep->esb_stat |= ESB_ST_REC_QUAL; + fc_exch_timer_set_locked(ep, ep->r_a_tov); + spin_unlock_bh(&ep->ex_lock); +} + +/** + * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests + * @fp: The RRQ frame, not freed here. + */ +static void fc_exch_els_rrq(struct fc_frame *fp) +{ + struct fc_lport *lport; + struct fc_exch *ep = NULL; /* request or subject exchange */ + struct fc_els_rrq *rp; + u32 sid; + u16 xid; + enum fc_els_rjt_explan explan; + + lport = fr_dev(fp); + rp = fc_frame_payload_get(fp, sizeof(*rp)); + explan = ELS_EXPL_INV_LEN; + if (!rp) + goto reject; + + /* + * lookup subject exchange. + */ + sid = ntoh24(rp->rrq_s_id); /* subject source */ + xid = fc_host_port_id(lport->host) == sid ? + ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); + ep = fc_exch_lookup(lport, xid); + explan = ELS_EXPL_OXID_RXID; + if (!ep) + goto reject; + spin_lock_bh(&ep->ex_lock); + if (ep->oxid != ntohs(rp->rrq_ox_id)) + goto unlock_reject; + if (ep->rxid != ntohs(rp->rrq_rx_id) && + ep->rxid != FC_XID_UNKNOWN) + goto unlock_reject; + explan = ELS_EXPL_SID; + if (ep->sid != sid) + goto unlock_reject; + + /* + * Clear Recovery Qualifier state, and cancel timer if complete. + */ + if (ep->esb_stat & ESB_ST_REC_QUAL) { + ep->esb_stat &= ~ESB_ST_REC_QUAL; + atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ + } + if (ep->esb_stat & ESB_ST_COMPLETE) + fc_exch_timer_cancel(ep); + + spin_unlock_bh(&ep->ex_lock); + + /* + * Send LS_ACC. + */ + fc_seq_ls_acc(fp); + goto out; + +unlock_reject: + spin_unlock_bh(&ep->ex_lock); +reject: + fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan); +out: + if (ep) + fc_exch_release(ep); /* drop hold from fc_exch_find */ +} + +/** + * fc_exch_update_stats() - update exches stats to lport + * @lport: The local port to update exchange manager stats + */ +void fc_exch_update_stats(struct fc_lport *lport) +{ + struct fc_host_statistics *st; + struct fc_exch_mgr_anchor *ema; + struct fc_exch_mgr *mp; + + st = &lport->host_stats; + + list_for_each_entry(ema, &lport->ema_list, ema_list) { + mp = ema->mp; + st->fc_no_free_exch += atomic_read(&mp->stats.no_free_exch); + st->fc_no_free_exch_xid += + atomic_read(&mp->stats.no_free_exch_xid); + st->fc_xid_not_found += atomic_read(&mp->stats.xid_not_found); + st->fc_xid_busy += atomic_read(&mp->stats.xid_busy); + st->fc_seq_not_found += atomic_read(&mp->stats.seq_not_found); + st->fc_non_bls_resp += atomic_read(&mp->stats.non_bls_resp); + } +} +EXPORT_SYMBOL(fc_exch_update_stats); + +/** + * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs + * @lport: The local port to add the exchange manager to + * @mp: The exchange manager to be added to the local port + * @match: The match routine that indicates when this EM should be used + */ +struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, + struct fc_exch_mgr *mp, + bool (*match)(struct fc_frame *)) +{ + struct fc_exch_mgr_anchor *ema; + + ema = kmalloc(sizeof(*ema), GFP_ATOMIC); + if (!ema) + return ema; + + ema->mp = mp; + ema->match = match; + /* add EM anchor to EM anchors list */ + list_add_tail(&ema->ema_list, &lport->ema_list); + kref_get(&mp->kref); + return ema; +} +EXPORT_SYMBOL(fc_exch_mgr_add); + +/** + * fc_exch_mgr_destroy() - Destroy an exchange manager + * @kref: The reference to the EM to be destroyed + */ +static void fc_exch_mgr_destroy(struct kref *kref) +{ + struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); + + mempool_destroy(mp->ep_pool); + free_percpu(mp->pool); + kfree(mp); +} + +/** + * fc_exch_mgr_del() - Delete an EM from a local port's list + * @ema: The exchange manager anchor identifying the EM to be deleted + */ +void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) +{ + /* remove EM anchor from EM anchors list */ + list_del(&ema->ema_list); + kref_put(&ema->mp->kref, fc_exch_mgr_destroy); + kfree(ema); +} +EXPORT_SYMBOL(fc_exch_mgr_del); + +/** + * fc_exch_mgr_list_clone() - Share all exchange manager objects + * @src: Source lport to clone exchange managers from + * @dst: New lport that takes references to all the exchange managers + */ +int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst) +{ + struct fc_exch_mgr_anchor *ema, *tmp; + + list_for_each_entry(ema, &src->ema_list, ema_list) { + if (!fc_exch_mgr_add(dst, ema->mp, ema->match)) + goto err; + } + return 0; +err: + list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list) + fc_exch_mgr_del(ema); + return -ENOMEM; +} +EXPORT_SYMBOL(fc_exch_mgr_list_clone); + +/** + * fc_exch_mgr_alloc() - Allocate an exchange manager + * @lport: The local port that the new EM will be associated with + * @class: The default FC class for new exchanges + * @min_xid: The minimum XID for exchanges from the new EM + * @max_xid: The maximum XID for exchanges from the new EM + * @match: The match routine for the new EM + */ +struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport, + enum fc_class class, + u16 min_xid, u16 max_xid, + bool (*match)(struct fc_frame *)) +{ + struct fc_exch_mgr *mp; + u16 pool_exch_range; + size_t pool_size; + unsigned int cpu; + struct fc_exch_pool *pool; + + if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || + (min_xid & fc_cpu_mask) != 0) { + FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", + min_xid, max_xid); + return NULL; + } + + /* + * allocate memory for EM + */ + mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC); + if (!mp) + return NULL; + + mp->class = class; + /* adjust em exch xid range for offload */ + mp->min_xid = min_xid; + + /* reduce range so per cpu pool fits into PCPU_MIN_UNIT_SIZE pool */ + pool_exch_range = (PCPU_MIN_UNIT_SIZE - sizeof(*pool)) / + sizeof(struct fc_exch *); + if ((max_xid - min_xid + 1) / (fc_cpu_mask + 1) > pool_exch_range) { + mp->max_xid = pool_exch_range * (fc_cpu_mask + 1) + + min_xid - 1; + } else { + mp->max_xid = max_xid; + pool_exch_range = (mp->max_xid - mp->min_xid + 1) / + (fc_cpu_mask + 1); + } + + mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); + if (!mp->ep_pool) + goto free_mp; + + /* + * Setup per cpu exch pool with entire exchange id range equally + * divided across all cpus. The exch pointers array memory is + * allocated for exch range per pool. + */ + mp->pool_max_index = pool_exch_range - 1; + + /* + * Allocate and initialize per cpu exch pool + */ + pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *); + mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool)); + if (!mp->pool) + goto free_mempool; + for_each_possible_cpu(cpu) { + pool = per_cpu_ptr(mp->pool, cpu); + pool->next_index = 0; + pool->left = FC_XID_UNKNOWN; + pool->right = FC_XID_UNKNOWN; + spin_lock_init(&pool->lock); + INIT_LIST_HEAD(&pool->ex_list); + } + + kref_init(&mp->kref); + if (!fc_exch_mgr_add(lport, mp, match)) { + free_percpu(mp->pool); + goto free_mempool; + } + + /* + * Above kref_init() sets mp->kref to 1 and then + * call to fc_exch_mgr_add incremented mp->kref again, + * so adjust that extra increment. + */ + kref_put(&mp->kref, fc_exch_mgr_destroy); + return mp; + +free_mempool: + mempool_destroy(mp->ep_pool); +free_mp: + kfree(mp); + return NULL; +} +EXPORT_SYMBOL(fc_exch_mgr_alloc); + +/** + * fc_exch_mgr_free() - Free all exchange managers on a local port + * @lport: The local port whose EMs are to be freed + */ +void fc_exch_mgr_free(struct fc_lport *lport) +{ + struct fc_exch_mgr_anchor *ema, *next; + + flush_workqueue(fc_exch_workqueue); + list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) + fc_exch_mgr_del(ema); +} +EXPORT_SYMBOL(fc_exch_mgr_free); + +/** + * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending + * upon 'xid'. + * @f_ctl: f_ctl + * @lport: The local port the frame was received on + * @fh: The received frame header + */ +static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl, + struct fc_lport *lport, + struct fc_frame_header *fh) +{ + struct fc_exch_mgr_anchor *ema; + u16 xid; + + if (f_ctl & FC_FC_EX_CTX) + xid = ntohs(fh->fh_ox_id); + else { + xid = ntohs(fh->fh_rx_id); + if (xid == FC_XID_UNKNOWN) + return list_entry(lport->ema_list.prev, + typeof(*ema), ema_list); + } + + list_for_each_entry(ema, &lport->ema_list, ema_list) { + if ((xid >= ema->mp->min_xid) && + (xid <= ema->mp->max_xid)) + return ema; + } + return NULL; +} +/** + * fc_exch_recv() - Handler for received frames + * @lport: The local port the frame was received on + * @fp: The received frame + */ +void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp) +{ + struct fc_frame_header *fh = fc_frame_header_get(fp); + struct fc_exch_mgr_anchor *ema; + u32 f_ctl; + + /* lport lock ? */ + if (!lport || lport->state == LPORT_ST_DISABLED) { + FC_LPORT_DBG(lport, "Receiving frames for an lport that " + "has not been initialized correctly\n"); + fc_frame_free(fp); + return; + } + + f_ctl = ntoh24(fh->fh_f_ctl); + ema = fc_find_ema(f_ctl, lport, fh); + if (!ema) { + FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor," + "fc_ctl <0x%x>, xid <0x%x>\n", + f_ctl, + (f_ctl & FC_FC_EX_CTX) ? + ntohs(fh->fh_ox_id) : + ntohs(fh->fh_rx_id)); + fc_frame_free(fp); + return; + } + + /* + * If frame is marked invalid, just drop it. + */ + switch (fr_eof(fp)) { + case FC_EOF_T: + if (f_ctl & FC_FC_END_SEQ) + skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); + /* fall through */ + case FC_EOF_N: + if (fh->fh_type == FC_TYPE_BLS) + fc_exch_recv_bls(ema->mp, fp); + else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == + FC_FC_EX_CTX) + fc_exch_recv_seq_resp(ema->mp, fp); + else if (f_ctl & FC_FC_SEQ_CTX) + fc_exch_recv_resp(ema->mp, fp); + else /* no EX_CTX and no SEQ_CTX */ + fc_exch_recv_req(lport, ema->mp, fp); + break; + default: + FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)", + fr_eof(fp)); + fc_frame_free(fp); + } +} +EXPORT_SYMBOL(fc_exch_recv); + +/** + * fc_exch_init() - Initialize the exchange layer for a local port + * @lport: The local port to initialize the exchange layer for + */ +int fc_exch_init(struct fc_lport *lport) +{ + if (!lport->tt.seq_start_next) + lport->tt.seq_start_next = fc_seq_start_next; + + if (!lport->tt.seq_set_resp) + lport->tt.seq_set_resp = fc_seq_set_resp; + + if (!lport->tt.exch_seq_send) + lport->tt.exch_seq_send = fc_exch_seq_send; + + if (!lport->tt.seq_send) + lport->tt.seq_send = fc_seq_send; + + if (!lport->tt.seq_els_rsp_send) + lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send; + + if (!lport->tt.exch_done) + lport->tt.exch_done = fc_exch_done; + + if (!lport->tt.exch_mgr_reset) + lport->tt.exch_mgr_reset = fc_exch_mgr_reset; + + if (!lport->tt.seq_exch_abort) + lport->tt.seq_exch_abort = fc_seq_exch_abort; + + if (!lport->tt.seq_assign) + lport->tt.seq_assign = fc_seq_assign; + + if (!lport->tt.seq_release) + lport->tt.seq_release = fc_seq_release; + + return 0; +} +EXPORT_SYMBOL(fc_exch_init); + +/** + * fc_setup_exch_mgr() - Setup an exchange manager + */ +int fc_setup_exch_mgr(void) +{ + fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!fc_em_cachep) + return -ENOMEM; + + /* + * Initialize fc_cpu_mask and fc_cpu_order. The + * fc_cpu_mask is set for nr_cpu_ids rounded up + * to order of 2's * power and order is stored + * in fc_cpu_order as this is later required in + * mapping between an exch id and exch array index + * in per cpu exch pool. + * + * This round up is required to align fc_cpu_mask + * to exchange id's lower bits such that all incoming + * frames of an exchange gets delivered to the same + * cpu on which exchange originated by simple bitwise + * AND operation between fc_cpu_mask and exchange id. + */ + fc_cpu_order = ilog2(roundup_pow_of_two(nr_cpu_ids)); + fc_cpu_mask = (1 << fc_cpu_order) - 1; + + fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue"); + if (!fc_exch_workqueue) + goto err; + return 0; +err: + kmem_cache_destroy(fc_em_cachep); + return -ENOMEM; +} + +/** + * fc_destroy_exch_mgr() - Destroy an exchange manager + */ +void fc_destroy_exch_mgr(void) +{ + destroy_workqueue(fc_exch_workqueue); + kmem_cache_destroy(fc_em_cachep); +} diff --git a/kernel/drivers/scsi/libfc/fc_fcp.c b/kernel/drivers/scsi/libfc/fc_fcp.c new file mode 100644 index 000000000..c6795941b --- /dev/null +++ b/kernel/drivers/scsi/libfc/fc_fcp.c @@ -0,0 +1,2245 @@ +/* + * Copyright(c) 2007 Intel Corporation. All rights reserved. + * Copyright(c) 2008 Red Hat, Inc. All rights reserved. + * Copyright(c) 2008 Mike Christie + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/spinlock.h> +#include <linux/scatterlist.h> +#include <linux/err.h> +#include <linux/crc32.h> +#include <linux/slab.h> + +#include <scsi/scsi_tcq.h> +#include <scsi/scsi.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_cmnd.h> + +#include <scsi/fc/fc_fc2.h> + +#include <scsi/libfc.h> +#include <scsi/fc_encode.h> + +#include "fc_libfc.h" + +static struct kmem_cache *scsi_pkt_cachep; + +/* SRB state definitions */ +#define FC_SRB_FREE 0 /* cmd is free */ +#define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */ +#define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */ +#define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */ +#define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */ +#define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */ +#define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */ +#define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */ + +#define FC_SRB_READ (1 << 1) +#define FC_SRB_WRITE (1 << 0) + +/* + * The SCp.ptr should be tested and set under the scsi_pkt_queue lock + */ +#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr) +#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in) +#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual) +#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status) +#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual) + +/** + * struct fc_fcp_internal - FCP layer internal data + * @scsi_pkt_pool: Memory pool to draw FCP packets from + * @scsi_queue_lock: Protects the scsi_pkt_queue + * @scsi_pkt_queue: Current FCP packets + * @last_can_queue_ramp_down_time: ramp down time + * @last_can_queue_ramp_up_time: ramp up time + * @max_can_queue: max can_queue size + */ +struct fc_fcp_internal { + mempool_t *scsi_pkt_pool; + spinlock_t scsi_queue_lock; + struct list_head scsi_pkt_queue; + unsigned long last_can_queue_ramp_down_time; + unsigned long last_can_queue_ramp_up_time; + int max_can_queue; +}; + +#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv) + +/* + * function prototypes + * FC scsi I/O related functions + */ +static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *); +static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *); +static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *); +static void fc_fcp_complete_locked(struct fc_fcp_pkt *); +static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *); +static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *); +static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code); +static void fc_fcp_timeout(unsigned long); +static void fc_fcp_rec(struct fc_fcp_pkt *); +static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *); +static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *); +static void fc_io_compl(struct fc_fcp_pkt *); + +static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32); +static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *); +static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *); + +/* + * command status codes + */ +#define FC_COMPLETE 0 +#define FC_CMD_ABORTED 1 +#define FC_CMD_RESET 2 +#define FC_CMD_PLOGO 3 +#define FC_SNS_RCV 4 +#define FC_TRANS_ERR 5 +#define FC_DATA_OVRRUN 6 +#define FC_DATA_UNDRUN 7 +#define FC_ERROR 8 +#define FC_HRD_ERROR 9 +#define FC_CRC_ERROR 10 +#define FC_TIMED_OUT 11 + +/* + * Error recovery timeout values. + */ +#define FC_SCSI_TM_TOV (10 * HZ) +#define FC_HOST_RESET_TIMEOUT (30 * HZ) +#define FC_CAN_QUEUE_PERIOD (60 * HZ) + +#define FC_MAX_ERROR_CNT 5 +#define FC_MAX_RECOV_RETRY 3 + +#define FC_FCP_DFLT_QUEUE_DEPTH 32 + +/** + * fc_fcp_pkt_alloc() - Allocate a fcp_pkt + * @lport: The local port that the FCP packet is for + * @gfp: GFP flags for allocation + * + * Return value: fcp_pkt structure or null on allocation failure. + * Context: Can be called from process context, no lock is required. + */ +static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp) +{ + struct fc_fcp_internal *si = fc_get_scsi_internal(lport); + struct fc_fcp_pkt *fsp; + + fsp = mempool_alloc(si->scsi_pkt_pool, gfp); + if (fsp) { + memset(fsp, 0, sizeof(*fsp)); + fsp->lp = lport; + fsp->xfer_ddp = FC_XID_UNKNOWN; + atomic_set(&fsp->ref_cnt, 1); + init_timer(&fsp->timer); + fsp->timer.data = (unsigned long)fsp; + INIT_LIST_HEAD(&fsp->list); + spin_lock_init(&fsp->scsi_pkt_lock); + } else { + per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++; + put_cpu(); + } + return fsp; +} + +/** + * fc_fcp_pkt_release() - Release hold on a fcp_pkt + * @fsp: The FCP packet to be released + * + * Context: Can be called from process or interrupt context, + * no lock is required. + */ +static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp) +{ + if (atomic_dec_and_test(&fsp->ref_cnt)) { + struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp); + + mempool_free(fsp, si->scsi_pkt_pool); + } +} + +/** + * fc_fcp_pkt_hold() - Hold a fcp_pkt + * @fsp: The FCP packet to be held + */ +static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp) +{ + atomic_inc(&fsp->ref_cnt); +} + +/** + * fc_fcp_pkt_destory() - Release hold on a fcp_pkt + * @seq: The sequence that the FCP packet is on (required by destructor API) + * @fsp: The FCP packet to be released + * + * This routine is called by a destructor callback in the exch_seq_send() + * routine of the libfc Transport Template. The 'struct fc_seq' is a required + * argument even though it is not used by this routine. + * + * Context: No locking required. + */ +static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp) +{ + fc_fcp_pkt_release(fsp); +} + +/** + * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count + * @fsp: The FCP packet to be locked and incremented + * + * We should only return error if we return a command to SCSI-ml before + * getting a response. This can happen in cases where we send a abort, but + * do not wait for the response and the abort and command can be passing + * each other on the wire/network-layer. + * + * Note: this function locks the packet and gets a reference to allow + * callers to call the completion function while the lock is held and + * not have to worry about the packets refcount. + * + * TODO: Maybe we should just have callers grab/release the lock and + * have a function that they call to verify the fsp and grab a ref if + * needed. + */ +static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp) +{ + spin_lock_bh(&fsp->scsi_pkt_lock); + if (fsp->state & FC_SRB_COMPL) { + spin_unlock_bh(&fsp->scsi_pkt_lock); + return -EPERM; + } + + fc_fcp_pkt_hold(fsp); + return 0; +} + +/** + * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its + * reference count + * @fsp: The FCP packet to be unlocked and decremented + */ +static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp) +{ + spin_unlock_bh(&fsp->scsi_pkt_lock); + fc_fcp_pkt_release(fsp); +} + +/** + * fc_fcp_timer_set() - Start a timer for a fcp_pkt + * @fsp: The FCP packet to start a timer for + * @delay: The timeout period in jiffies + */ +static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay) +{ + if (!(fsp->state & FC_SRB_COMPL)) + mod_timer(&fsp->timer, jiffies + delay); +} + +/** + * fc_fcp_send_abort() - Send an abort for exchanges associated with a + * fcp_pkt + * @fsp: The FCP packet to abort exchanges on + */ +static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp) +{ + if (!fsp->seq_ptr) + return -EINVAL; + + per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++; + put_cpu(); + + fsp->state |= FC_SRB_ABORT_PENDING; + return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0); +} + +/** + * fc_fcp_retry_cmd() - Retry a fcp_pkt + * @fsp: The FCP packet to be retried + * + * Sets the status code to be FC_ERROR and then calls + * fc_fcp_complete_locked() which in turn calls fc_io_compl(). + * fc_io_compl() will notify the SCSI-ml that the I/O is done. + * The SCSI-ml will retry the command. + */ +static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp) +{ + if (fsp->seq_ptr) { + fsp->lp->tt.exch_done(fsp->seq_ptr); + fsp->seq_ptr = NULL; + } + + fsp->state &= ~FC_SRB_ABORT_PENDING; + fsp->io_status = 0; + fsp->status_code = FC_ERROR; + fc_fcp_complete_locked(fsp); +} + +/** + * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context + * @fsp: The FCP packet that will manage the DDP frames + * @xid: The XID that will be used for the DDP exchange + */ +void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid) +{ + struct fc_lport *lport; + + lport = fsp->lp; + if ((fsp->req_flags & FC_SRB_READ) && + (lport->lro_enabled) && (lport->tt.ddp_setup)) { + if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd), + scsi_sg_count(fsp->cmd))) + fsp->xfer_ddp = xid; + } +} + +/** + * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any + * DDP related resources for a fcp_pkt + * @fsp: The FCP packet that DDP had been used on + */ +void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp) +{ + struct fc_lport *lport; + + if (!fsp) + return; + + if (fsp->xfer_ddp == FC_XID_UNKNOWN) + return; + + lport = fsp->lp; + if (lport->tt.ddp_done) { + fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp); + fsp->xfer_ddp = FC_XID_UNKNOWN; + } +} + +/** + * fc_fcp_can_queue_ramp_up() - increases can_queue + * @lport: lport to ramp up can_queue + */ +static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport) +{ + struct fc_fcp_internal *si = fc_get_scsi_internal(lport); + unsigned long flags; + int can_queue; + + spin_lock_irqsave(lport->host->host_lock, flags); + + if (si->last_can_queue_ramp_up_time && + (time_before(jiffies, si->last_can_queue_ramp_up_time + + FC_CAN_QUEUE_PERIOD))) + goto unlock; + + if (time_before(jiffies, si->last_can_queue_ramp_down_time + + FC_CAN_QUEUE_PERIOD)) + goto unlock; + + si->last_can_queue_ramp_up_time = jiffies; + + can_queue = lport->host->can_queue << 1; + if (can_queue >= si->max_can_queue) { + can_queue = si->max_can_queue; + si->last_can_queue_ramp_down_time = 0; + } + lport->host->can_queue = can_queue; + shost_printk(KERN_ERR, lport->host, "libfc: increased " + "can_queue to %d.\n", can_queue); + +unlock: + spin_unlock_irqrestore(lport->host->host_lock, flags); +} + +/** + * fc_fcp_can_queue_ramp_down() - reduces can_queue + * @lport: lport to reduce can_queue + * + * If we are getting memory allocation failures, then we may + * be trying to execute too many commands. We let the running + * commands complete or timeout, then try again with a reduced + * can_queue. Eventually we will hit the point where we run + * on all reserved structs. + */ +static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport) +{ + struct fc_fcp_internal *si = fc_get_scsi_internal(lport); + unsigned long flags; + int can_queue; + + spin_lock_irqsave(lport->host->host_lock, flags); + + if (si->last_can_queue_ramp_down_time && + (time_before(jiffies, si->last_can_queue_ramp_down_time + + FC_CAN_QUEUE_PERIOD))) + goto unlock; + + si->last_can_queue_ramp_down_time = jiffies; + + can_queue = lport->host->can_queue; + can_queue >>= 1; + if (!can_queue) + can_queue = 1; + lport->host->can_queue = can_queue; + shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n" + "Reducing can_queue to %d.\n", can_queue); + +unlock: + spin_unlock_irqrestore(lport->host->host_lock, flags); +} + +/* + * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer. + * @lport: fc lport struct + * @len: payload length + * + * Allocates fc_frame structure and buffer but if fails to allocate + * then reduce can_queue. + */ +static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport, + size_t len) +{ + struct fc_frame *fp; + + fp = fc_frame_alloc(lport, len); + if (likely(fp)) + return fp; + + per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++; + put_cpu(); + /* error case */ + fc_fcp_can_queue_ramp_down(lport); + return NULL; +} + +/** + * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target + * @fsp: The FCP packet the data is on + * @fp: The data frame + */ +static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp) +{ + struct scsi_cmnd *sc = fsp->cmd; + struct fc_lport *lport = fsp->lp; + struct fc_stats *stats; + struct fc_frame_header *fh; + size_t start_offset; + size_t offset; + u32 crc; + u32 copy_len = 0; + size_t len; + void *buf; + struct scatterlist *sg; + u32 nents; + u8 host_bcode = FC_COMPLETE; + + fh = fc_frame_header_get(fp); + offset = ntohl(fh->fh_parm_offset); + start_offset = offset; + len = fr_len(fp) - sizeof(*fh); + buf = fc_frame_payload_get(fp, 0); + + /* + * if this I/O is ddped then clear it and initiate recovery since data + * frames are expected to be placed directly in that case. + * + * Indicate error to scsi-ml because something went wrong with the + * ddp handling to get us here. + */ + if (fsp->xfer_ddp != FC_XID_UNKNOWN) { + fc_fcp_ddp_done(fsp); + FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n"); + host_bcode = FC_ERROR; + goto err; + } + if (offset + len > fsp->data_len) { + /* this should never happen */ + if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) && + fc_frame_crc_check(fp)) + goto crc_err; + FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx " + "data_len %x\n", len, offset, fsp->data_len); + + /* Data is corrupted indicate scsi-ml should retry */ + host_bcode = FC_DATA_OVRRUN; + goto err; + } + if (offset != fsp->xfer_len) + fsp->state |= FC_SRB_DISCONTIG; + + sg = scsi_sglist(sc); + nents = scsi_sg_count(sc); + + if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) { + copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, + &offset, NULL); + } else { + crc = crc32(~0, (u8 *) fh, sizeof(*fh)); + copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents, + &offset, &crc); + buf = fc_frame_payload_get(fp, 0); + if (len % 4) + crc = crc32(crc, buf + len, 4 - (len % 4)); + + if (~crc != le32_to_cpu(fr_crc(fp))) { +crc_err: + stats = per_cpu_ptr(lport->stats, get_cpu()); + stats->ErrorFrames++; + /* per cpu count, not total count, but OK for limit */ + if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT) + printk(KERN_WARNING "libfc: CRC error on data " + "frame for port (%6.6x)\n", + lport->port_id); + put_cpu(); + /* + * Assume the frame is total garbage. + * We may have copied it over the good part + * of the buffer. + * If so, we need to retry the entire operation. + * Otherwise, ignore it. + */ + if (fsp->state & FC_SRB_DISCONTIG) { + host_bcode = FC_CRC_ERROR; + goto err; + } + return; + } + } + + if (fsp->xfer_contig_end == start_offset) + fsp->xfer_contig_end += copy_len; + fsp->xfer_len += copy_len; + + /* + * In the very rare event that this data arrived after the response + * and completes the transfer, call the completion handler. + */ + if (unlikely(fsp->state & FC_SRB_RCV_STATUS) && + fsp->xfer_len == fsp->data_len - fsp->scsi_resid) + fc_fcp_complete_locked(fsp); + return; +err: + fc_fcp_recovery(fsp, host_bcode); +} + +/** + * fc_fcp_send_data() - Send SCSI data to a target + * @fsp: The FCP packet the data is on + * @sp: The sequence the data is to be sent on + * @offset: The starting offset for this data request + * @seq_blen: The burst length for this data request + * + * Called after receiving a Transfer Ready data descriptor. + * If the LLD is capable of sequence offload then send down the + * seq_blen amount of data in single frame, otherwise send + * multiple frames of the maximum frame payload supported by + * the target port. + */ +static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq, + size_t offset, size_t seq_blen) +{ + struct fc_exch *ep; + struct scsi_cmnd *sc; + struct scatterlist *sg; + struct fc_frame *fp = NULL; + struct fc_lport *lport = fsp->lp; + struct page *page; + size_t remaining; + size_t t_blen; + size_t tlen; + size_t sg_bytes; + size_t frame_offset, fh_parm_offset; + size_t off; + int error; + void *data = NULL; + void *page_addr; + int using_sg = lport->sg_supp; + u32 f_ctl; + + WARN_ON(seq_blen <= 0); + if (unlikely(offset + seq_blen > fsp->data_len)) { + /* this should never happen */ + FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx " + "offset %zx\n", seq_blen, offset); + fc_fcp_send_abort(fsp); + return 0; + } else if (offset != fsp->xfer_len) { + /* Out of Order Data Request - no problem, but unexpected. */ + FC_FCP_DBG(fsp, "xfer-ready non-contiguous. " + "seq_blen %zx offset %zx\n", seq_blen, offset); + } + + /* + * if LLD is capable of seq_offload then set transport + * burst length (t_blen) to seq_blen, otherwise set t_blen + * to max FC frame payload previously set in fsp->max_payload. + */ + t_blen = fsp->max_payload; + if (lport->seq_offload) { + t_blen = min(seq_blen, (size_t)lport->lso_max); + FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n", + fsp, seq_blen, lport->lso_max, t_blen); + } + + if (t_blen > 512) + t_blen &= ~(512 - 1); /* round down to block size */ + sc = fsp->cmd; + + remaining = seq_blen; + fh_parm_offset = frame_offset = offset; + tlen = 0; + seq = lport->tt.seq_start_next(seq); + f_ctl = FC_FC_REL_OFF; + WARN_ON(!seq); + + sg = scsi_sglist(sc); + + while (remaining > 0 && sg) { + if (offset >= sg->length) { + offset -= sg->length; + sg = sg_next(sg); + continue; + } + if (!fp) { + tlen = min(t_blen, remaining); + + /* + * TODO. Temporary workaround. fc_seq_send() can't + * handle odd lengths in non-linear skbs. + * This will be the final fragment only. + */ + if (tlen % 4) + using_sg = 0; + fp = fc_frame_alloc(lport, using_sg ? 0 : tlen); + if (!fp) + return -ENOMEM; + + data = fc_frame_header_get(fp) + 1; + fh_parm_offset = frame_offset; + fr_max_payload(fp) = fsp->max_payload; + } + + off = offset + sg->offset; + sg_bytes = min(tlen, sg->length - offset); + sg_bytes = min(sg_bytes, + (size_t) (PAGE_SIZE - (off & ~PAGE_MASK))); + page = sg_page(sg) + (off >> PAGE_SHIFT); + if (using_sg) { + get_page(page); + skb_fill_page_desc(fp_skb(fp), + skb_shinfo(fp_skb(fp))->nr_frags, + page, off & ~PAGE_MASK, sg_bytes); + fp_skb(fp)->data_len += sg_bytes; + fr_len(fp) += sg_bytes; + fp_skb(fp)->truesize += PAGE_SIZE; + } else { + /* + * The scatterlist item may be bigger than PAGE_SIZE, + * but we must not cross pages inside the kmap. + */ + page_addr = kmap_atomic(page); + memcpy(data, (char *)page_addr + (off & ~PAGE_MASK), + sg_bytes); + kunmap_atomic(page_addr); + data += sg_bytes; + } + offset += sg_bytes; + frame_offset += sg_bytes; + tlen -= sg_bytes; + remaining -= sg_bytes; + + if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) && + (tlen)) + continue; + + /* + * Send sequence with transfer sequence initiative in case + * this is last FCP frame of the sequence. + */ + if (remaining == 0) + f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ; + + ep = fc_seq_exch(seq); + fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid, + FC_TYPE_FCP, f_ctl, fh_parm_offset); + + /* + * send fragment using for a sequence. + */ + error = lport->tt.seq_send(lport, seq, fp); + if (error) { + WARN_ON(1); /* send error should be rare */ + return error; + } + fp = NULL; + } + fsp->xfer_len += seq_blen; /* premature count? */ + return 0; +} + +/** + * fc_fcp_abts_resp() - Receive an ABTS response + * @fsp: The FCP packet that is being aborted + * @fp: The response frame + */ +static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) +{ + int ba_done = 1; + struct fc_ba_rjt *brp; + struct fc_frame_header *fh; + + fh = fc_frame_header_get(fp); + switch (fh->fh_r_ctl) { + case FC_RCTL_BA_ACC: + break; + case FC_RCTL_BA_RJT: + brp = fc_frame_payload_get(fp, sizeof(*brp)); + if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR) + break; + /* fall thru */ + default: + /* + * we will let the command timeout + * and scsi-ml recover in this case, + * therefore cleared the ba_done flag. + */ + ba_done = 0; + } + + if (ba_done) { + fsp->state |= FC_SRB_ABORTED; + fsp->state &= ~FC_SRB_ABORT_PENDING; + + if (fsp->wait_for_comp) + complete(&fsp->tm_done); + else + fc_fcp_complete_locked(fsp); + } +} + +/** + * fc_fcp_recv() - Receive an FCP frame + * @seq: The sequence the frame is on + * @fp: The received frame + * @arg: The related FCP packet + * + * Context: Called from Soft IRQ context. Can not be called + * holding the FCP packet list lock. + */ +static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg) +{ + struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; + struct fc_lport *lport = fsp->lp; + struct fc_frame_header *fh; + struct fcp_txrdy *dd; + u8 r_ctl; + int rc = 0; + + if (IS_ERR(fp)) { + fc_fcp_error(fsp, fp); + return; + } + + fh = fc_frame_header_get(fp); + r_ctl = fh->fh_r_ctl; + + if (lport->state != LPORT_ST_READY) + goto out; + if (fc_fcp_lock_pkt(fsp)) + goto out; + + if (fh->fh_type == FC_TYPE_BLS) { + fc_fcp_abts_resp(fsp, fp); + goto unlock; + } + + if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING)) + goto unlock; + + if (r_ctl == FC_RCTL_DD_DATA_DESC) { + /* + * received XFER RDY from the target + * need to send data to the target + */ + WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); + dd = fc_frame_payload_get(fp, sizeof(*dd)); + WARN_ON(!dd); + + rc = fc_fcp_send_data(fsp, seq, + (size_t) ntohl(dd->ft_data_ro), + (size_t) ntohl(dd->ft_burst_len)); + if (!rc) + seq->rec_data = fsp->xfer_len; + } else if (r_ctl == FC_RCTL_DD_SOL_DATA) { + /* + * received a DATA frame + * next we will copy the data to the system buffer + */ + WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */ + fc_fcp_recv_data(fsp, fp); + seq->rec_data = fsp->xfer_contig_end; + } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) { + WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED); + + fc_fcp_resp(fsp, fp); + } else { + FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl); + } +unlock: + fc_fcp_unlock_pkt(fsp); +out: + fc_frame_free(fp); +} + +/** + * fc_fcp_resp() - Handler for FCP responses + * @fsp: The FCP packet the response is for + * @fp: The response frame + */ +static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp) +{ + struct fc_frame_header *fh; + struct fcp_resp *fc_rp; + struct fcp_resp_ext *rp_ex; + struct fcp_resp_rsp_info *fc_rp_info; + u32 plen; + u32 expected_len; + u32 respl = 0; + u32 snsl = 0; + u8 flags = 0; + + plen = fr_len(fp); + fh = (struct fc_frame_header *)fr_hdr(fp); + if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp))) + goto len_err; + plen -= sizeof(*fh); + fc_rp = (struct fcp_resp *)(fh + 1); + fsp->cdb_status = fc_rp->fr_status; + flags = fc_rp->fr_flags; + fsp->scsi_comp_flags = flags; + expected_len = fsp->data_len; + + /* if ddp, update xfer len */ + fc_fcp_ddp_done(fsp); + + if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) { + rp_ex = (void *)(fc_rp + 1); + if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) { + if (plen < sizeof(*fc_rp) + sizeof(*rp_ex)) + goto len_err; + fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1); + if (flags & FCP_RSP_LEN_VAL) { + respl = ntohl(rp_ex->fr_rsp_len); + if ((respl != FCP_RESP_RSP_INFO_LEN4) && + (respl != FCP_RESP_RSP_INFO_LEN8)) + goto len_err; + if (fsp->wait_for_comp) { + /* Abuse cdb_status for rsp code */ + fsp->cdb_status = fc_rp_info->rsp_code; + complete(&fsp->tm_done); + /* + * tmfs will not have any scsi cmd so + * exit here + */ + return; + } + } + if (flags & FCP_SNS_LEN_VAL) { + snsl = ntohl(rp_ex->fr_sns_len); + if (snsl > SCSI_SENSE_BUFFERSIZE) + snsl = SCSI_SENSE_BUFFERSIZE; + memcpy(fsp->cmd->sense_buffer, + (char *)fc_rp_info + respl, snsl); + } + } + if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) { + if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid)) + goto len_err; + if (flags & FCP_RESID_UNDER) { + fsp->scsi_resid = ntohl(rp_ex->fr_resid); + /* + * The cmnd->underflow is the minimum number of + * bytes that must be transferred for this + * command. Provided a sense condition is not + * present, make sure the actual amount + * transferred is at least the underflow value + * or fail. + */ + if (!(flags & FCP_SNS_LEN_VAL) && + (fc_rp->fr_status == 0) && + (scsi_bufflen(fsp->cmd) - + fsp->scsi_resid) < fsp->cmd->underflow) + goto err; + expected_len -= fsp->scsi_resid; + } else { + fsp->status_code = FC_ERROR; + } + } + } + fsp->state |= FC_SRB_RCV_STATUS; + + /* + * Check for missing or extra data frames. + */ + if (unlikely(fsp->cdb_status == SAM_STAT_GOOD && + fsp->xfer_len != expected_len)) { + if (fsp->xfer_len < expected_len) { + /* + * Some data may be queued locally, + * Wait a at least one jiffy to see if it is delivered. + * If this expires without data, we may do SRR. + */ + fc_fcp_timer_set(fsp, 2); + return; + } + fsp->status_code = FC_DATA_OVRRUN; + FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, " + "len %x, data len %x\n", + fsp->rport->port_id, + fsp->xfer_len, expected_len, fsp->data_len); + } + fc_fcp_complete_locked(fsp); + return; + +len_err: + FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u " + "snsl %u\n", flags, fr_len(fp), respl, snsl); +err: + fsp->status_code = FC_ERROR; + fc_fcp_complete_locked(fsp); +} + +/** + * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the + * fcp_pkt lock held + * @fsp: The FCP packet to be completed + * + * This function may sleep if a timer is pending. The packet lock must be + * held, and the host lock must not be held. + */ +static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp) +{ + struct fc_lport *lport = fsp->lp; + struct fc_seq *seq; + struct fc_exch *ep; + u32 f_ctl; + + if (fsp->state & FC_SRB_ABORT_PENDING) + return; + + if (fsp->state & FC_SRB_ABORTED) { + if (!fsp->status_code) + fsp->status_code = FC_CMD_ABORTED; + } else { + /* + * Test for transport underrun, independent of response + * underrun status. + */ + if (fsp->cdb_status == SAM_STAT_GOOD && + fsp->xfer_len < fsp->data_len && !fsp->io_status && + (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) || + fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) + fsp->status_code = FC_DATA_UNDRUN; + } + + seq = fsp->seq_ptr; + if (seq) { + fsp->seq_ptr = NULL; + if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) { + struct fc_frame *conf_frame; + struct fc_seq *csp; + + csp = lport->tt.seq_start_next(seq); + conf_frame = fc_fcp_frame_alloc(fsp->lp, 0); + if (conf_frame) { + f_ctl = FC_FC_SEQ_INIT; + f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; + ep = fc_seq_exch(seq); + fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL, + ep->did, ep->sid, + FC_TYPE_FCP, f_ctl, 0); + lport->tt.seq_send(lport, csp, conf_frame); + } + } + lport->tt.exch_done(seq); + } + /* + * Some resets driven by SCSI are not I/Os and do not have + * SCSI commands associated with the requests. We should not + * call I/O completion if we do not have a SCSI command. + */ + if (fsp->cmd) + fc_io_compl(fsp); +} + +/** + * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt + * @fsp: The FCP packet whose exchanges should be canceled + * @error: The reason for the cancellation + */ +static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error) +{ + struct fc_lport *lport = fsp->lp; + + if (fsp->seq_ptr) { + lport->tt.exch_done(fsp->seq_ptr); + fsp->seq_ptr = NULL; + } + fsp->status_code = error; +} + +/** + * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port + * @lport: The local port whose exchanges should be canceled + * @id: The target's ID + * @lun: The LUN + * @error: The reason for cancellation + * + * If lun or id is -1, they are ignored. + */ +static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id, + unsigned int lun, int error) +{ + struct fc_fcp_internal *si = fc_get_scsi_internal(lport); + struct fc_fcp_pkt *fsp; + struct scsi_cmnd *sc_cmd; + unsigned long flags; + + spin_lock_irqsave(&si->scsi_queue_lock, flags); +restart: + list_for_each_entry(fsp, &si->scsi_pkt_queue, list) { + sc_cmd = fsp->cmd; + if (id != -1 && scmd_id(sc_cmd) != id) + continue; + + if (lun != -1 && sc_cmd->device->lun != lun) + continue; + + fc_fcp_pkt_hold(fsp); + spin_unlock_irqrestore(&si->scsi_queue_lock, flags); + + if (!fc_fcp_lock_pkt(fsp)) { + fc_fcp_cleanup_cmd(fsp, error); + fc_io_compl(fsp); + fc_fcp_unlock_pkt(fsp); + } + + fc_fcp_pkt_release(fsp); + spin_lock_irqsave(&si->scsi_queue_lock, flags); + /* + * while we dropped the lock multiple pkts could + * have been released, so we have to start over. + */ + goto restart; + } + spin_unlock_irqrestore(&si->scsi_queue_lock, flags); +} + +/** + * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port + * @lport: The local port whose exchanges are to be aborted + */ +static void fc_fcp_abort_io(struct fc_lport *lport) +{ + fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR); +} + +/** + * fc_fcp_pkt_send() - Send a fcp_pkt + * @lport: The local port to send the FCP packet on + * @fsp: The FCP packet to send + * + * Return: Zero for success and -1 for failure + * Locks: Called without locks held + */ +static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) +{ + struct fc_fcp_internal *si = fc_get_scsi_internal(lport); + unsigned long flags; + int rc; + + fsp->cmd->SCp.ptr = (char *)fsp; + fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); + fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK; + + int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun); + memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len); + + spin_lock_irqsave(&si->scsi_queue_lock, flags); + list_add_tail(&fsp->list, &si->scsi_pkt_queue); + spin_unlock_irqrestore(&si->scsi_queue_lock, flags); + rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv); + if (unlikely(rc)) { + spin_lock_irqsave(&si->scsi_queue_lock, flags); + fsp->cmd->SCp.ptr = NULL; + list_del(&fsp->list); + spin_unlock_irqrestore(&si->scsi_queue_lock, flags); + } + + return rc; +} + +/** + * get_fsp_rec_tov() - Helper function to get REC_TOV + * @fsp: the FCP packet + * + * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second + */ +static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp) +{ + struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data; + + return msecs_to_jiffies(rpriv->e_d_tov) + HZ; +} + +/** + * fc_fcp_cmd_send() - Send a FCP command + * @lport: The local port to send the command on + * @fsp: The FCP packet the command is on + * @resp: The handler for the response + */ +static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, + void (*resp)(struct fc_seq *, + struct fc_frame *fp, + void *arg)) +{ + struct fc_frame *fp; + struct fc_seq *seq; + struct fc_rport *rport; + struct fc_rport_libfc_priv *rpriv; + const size_t len = sizeof(fsp->cdb_cmd); + int rc = 0; + + if (fc_fcp_lock_pkt(fsp)) + return 0; + + fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd)); + if (!fp) { + rc = -1; + goto unlock; + } + + memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len); + fr_fsp(fp) = fsp; + rport = fsp->rport; + fsp->max_payload = rport->maxframe_size; + rpriv = rport->dd_data; + + fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id, + rpriv->local_port->port_id, FC_TYPE_FCP, + FC_FCTL_REQ, 0); + + seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy, + fsp, 0); + if (!seq) { + rc = -1; + goto unlock; + } + fsp->seq_ptr = seq; + fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */ + + setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp); + if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) + fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); + +unlock: + fc_fcp_unlock_pkt(fsp); + return rc; +} + +/** + * fc_fcp_error() - Handler for FCP layer errors + * @fsp: The FCP packet the error is on + * @fp: The frame that has errored + */ +static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) +{ + int error = PTR_ERR(fp); + + if (fc_fcp_lock_pkt(fsp)) + return; + + if (error == -FC_EX_CLOSED) { + fc_fcp_retry_cmd(fsp); + goto unlock; + } + + /* + * clear abort pending, because the lower layer + * decided to force completion. + */ + fsp->state &= ~FC_SRB_ABORT_PENDING; + fsp->status_code = FC_CMD_PLOGO; + fc_fcp_complete_locked(fsp); +unlock: + fc_fcp_unlock_pkt(fsp); +} + +/** + * fc_fcp_pkt_abort() - Abort a fcp_pkt + * @fsp: The FCP packet to abort on + * + * Called to send an abort and then wait for abort completion + */ +static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp) +{ + int rc = FAILED; + unsigned long ticks_left; + + if (fc_fcp_send_abort(fsp)) + return FAILED; + + init_completion(&fsp->tm_done); + fsp->wait_for_comp = 1; + + spin_unlock_bh(&fsp->scsi_pkt_lock); + ticks_left = wait_for_completion_timeout(&fsp->tm_done, + FC_SCSI_TM_TOV); + spin_lock_bh(&fsp->scsi_pkt_lock); + fsp->wait_for_comp = 0; + + if (!ticks_left) { + FC_FCP_DBG(fsp, "target abort cmd failed\n"); + } else if (fsp->state & FC_SRB_ABORTED) { + FC_FCP_DBG(fsp, "target abort cmd passed\n"); + rc = SUCCESS; + fc_fcp_complete_locked(fsp); + } + + return rc; +} + +/** + * fc_lun_reset_send() - Send LUN reset command + * @data: The FCP packet that identifies the LUN to be reset + */ +static void fc_lun_reset_send(unsigned long data) +{ + struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; + struct fc_lport *lport = fsp->lp; + + if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) { + if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY) + return; + if (fc_fcp_lock_pkt(fsp)) + return; + setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp); + fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); + fc_fcp_unlock_pkt(fsp); + } +} + +/** + * fc_lun_reset() - Send a LUN RESET command to a device + * and wait for the reply + * @lport: The local port to sent the command on + * @fsp: The FCP packet that identifies the LUN to be reset + * @id: The SCSI command ID + * @lun: The LUN ID to be reset + */ +static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp, + unsigned int id, unsigned int lun) +{ + int rc; + + fsp->cdb_cmd.fc_dl = htonl(fsp->data_len); + fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET; + int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun); + + fsp->wait_for_comp = 1; + init_completion(&fsp->tm_done); + + fc_lun_reset_send((unsigned long)fsp); + + /* + * wait for completion of reset + * after that make sure all commands are terminated + */ + rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV); + + spin_lock_bh(&fsp->scsi_pkt_lock); + fsp->state |= FC_SRB_COMPL; + spin_unlock_bh(&fsp->scsi_pkt_lock); + + del_timer_sync(&fsp->timer); + + spin_lock_bh(&fsp->scsi_pkt_lock); + if (fsp->seq_ptr) { + lport->tt.exch_done(fsp->seq_ptr); + fsp->seq_ptr = NULL; + } + fsp->wait_for_comp = 0; + spin_unlock_bh(&fsp->scsi_pkt_lock); + + if (!rc) { + FC_SCSI_DBG(lport, "lun reset failed\n"); + return FAILED; + } + + /* cdb_status holds the tmf's rsp code */ + if (fsp->cdb_status != FCP_TMF_CMPL) + return FAILED; + + FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun); + fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED); + return SUCCESS; +} + +/** + * fc_tm_done() - Task Management response handler + * @seq: The sequence that the response is on + * @fp: The response frame + * @arg: The FCP packet the response is for + */ +static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg) +{ + struct fc_fcp_pkt *fsp = arg; + struct fc_frame_header *fh; + + if (IS_ERR(fp)) { + /* + * If there is an error just let it timeout or wait + * for TMF to be aborted if it timedout. + * + * scsi-eh will escalate for when either happens. + */ + return; + } + + if (fc_fcp_lock_pkt(fsp)) + goto out; + + /* + * raced with eh timeout handler. + */ + if (!fsp->seq_ptr || !fsp->wait_for_comp) + goto out_unlock; + + fh = fc_frame_header_get(fp); + if (fh->fh_type != FC_TYPE_BLS) + fc_fcp_resp(fsp, fp); + fsp->seq_ptr = NULL; + fsp->lp->tt.exch_done(seq); +out_unlock: + fc_fcp_unlock_pkt(fsp); +out: + fc_frame_free(fp); +} + +/** + * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port + * @lport: The local port to be cleaned up + */ +static void fc_fcp_cleanup(struct fc_lport *lport) +{ + fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR); +} + +/** + * fc_fcp_timeout() - Handler for fcp_pkt timeouts + * @data: The FCP packet that has timed out + * + * If REC is supported then just issue it and return. The REC exchange will + * complete or time out and recovery can continue at that point. Otherwise, + * if the response has been received without all the data it has been + * ER_TIMEOUT since the response was received. If the response has not been + * received we see if data was received recently. If it has been then we + * continue waiting, otherwise, we abort the command. + */ +static void fc_fcp_timeout(unsigned long data) +{ + struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data; + struct fc_rport *rport = fsp->rport; + struct fc_rport_libfc_priv *rpriv = rport->dd_data; + + if (fc_fcp_lock_pkt(fsp)) + return; + + if (fsp->cdb_cmd.fc_tm_flags) + goto unlock; + + fsp->state |= FC_SRB_FCP_PROCESSING_TMO; + + if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED) + fc_fcp_rec(fsp); + else if (fsp->state & FC_SRB_RCV_STATUS) + fc_fcp_complete_locked(fsp); + else + fc_fcp_recovery(fsp, FC_TIMED_OUT); + fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO; +unlock: + fc_fcp_unlock_pkt(fsp); +} + +/** + * fc_fcp_rec() - Send a REC ELS request + * @fsp: The FCP packet to send the REC request on + */ +static void fc_fcp_rec(struct fc_fcp_pkt *fsp) +{ + struct fc_lport *lport; + struct fc_frame *fp; + struct fc_rport *rport; + struct fc_rport_libfc_priv *rpriv; + + lport = fsp->lp; + rport = fsp->rport; + rpriv = rport->dd_data; + if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) { + fsp->status_code = FC_HRD_ERROR; + fsp->io_status = 0; + fc_fcp_complete_locked(fsp); + return; + } + + fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec)); + if (!fp) + goto retry; + + fr_seq(fp) = fsp->seq_ptr; + fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id, + rpriv->local_port->port_id, FC_TYPE_ELS, + FC_FCTL_REQ, 0); + if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC, + fc_fcp_rec_resp, fsp, + 2 * lport->r_a_tov)) { + fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */ + return; + } +retry: + if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) + fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); + else + fc_fcp_recovery(fsp, FC_TIMED_OUT); +} + +/** + * fc_fcp_rec_resp() - Handler for REC ELS responses + * @seq: The sequence the response is on + * @fp: The response frame + * @arg: The FCP packet the response is on + * + * If the response is a reject then the scsi layer will handle + * the timeout. If the response is a LS_ACC then if the I/O was not completed + * set the timeout and return. If the I/O was completed then complete the + * exchange and tell the SCSI layer. + */ +static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) +{ + struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg; + struct fc_els_rec_acc *recp; + struct fc_els_ls_rjt *rjt; + u32 e_stat; + u8 opcode; + u32 offset; + enum dma_data_direction data_dir; + enum fc_rctl r_ctl; + struct fc_rport_libfc_priv *rpriv; + + if (IS_ERR(fp)) { + fc_fcp_rec_error(fsp, fp); + return; + } + + if (fc_fcp_lock_pkt(fsp)) + goto out; + + fsp->recov_retry = 0; + opcode = fc_frame_payload_op(fp); + if (opcode == ELS_LS_RJT) { + rjt = fc_frame_payload_get(fp, sizeof(*rjt)); + switch (rjt->er_reason) { + default: + FC_FCP_DBG(fsp, "device %x unexpected REC reject " + "reason %d expl %d\n", + fsp->rport->port_id, rjt->er_reason, + rjt->er_explan); + /* fall through */ + case ELS_RJT_UNSUP: + FC_FCP_DBG(fsp, "device does not support REC\n"); + rpriv = fsp->rport->dd_data; + /* + * if we do not spport RECs or got some bogus + * reason then resetup timer so we check for + * making progress. + */ + rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED; + break; + case ELS_RJT_LOGIC: + case ELS_RJT_UNAB: + /* + * If no data transfer, the command frame got dropped + * so we just retry. If data was transferred, we + * lost the response but the target has no record, + * so we abort and retry. + */ + if (rjt->er_explan == ELS_EXPL_OXID_RXID && + fsp->xfer_len == 0) { + fc_fcp_retry_cmd(fsp); + break; + } + fc_fcp_recovery(fsp, FC_ERROR); + break; + } + } else if (opcode == ELS_LS_ACC) { + if (fsp->state & FC_SRB_ABORTED) + goto unlock_out; + + data_dir = fsp->cmd->sc_data_direction; + recp = fc_frame_payload_get(fp, sizeof(*recp)); + offset = ntohl(recp->reca_fc4value); + e_stat = ntohl(recp->reca_e_stat); + + if (e_stat & ESB_ST_COMPLETE) { + + /* + * The exchange is complete. + * + * For output, we must've lost the response. + * For input, all data must've been sent. + * We lost may have lost the response + * (and a confirmation was requested) and maybe + * some data. + * + * If all data received, send SRR + * asking for response. If partial data received, + * or gaps, SRR requests data at start of gap. + * Recovery via SRR relies on in-order-delivery. + */ + if (data_dir == DMA_TO_DEVICE) { + r_ctl = FC_RCTL_DD_CMD_STATUS; + } else if (fsp->xfer_contig_end == offset) { + r_ctl = FC_RCTL_DD_CMD_STATUS; + } else { + offset = fsp->xfer_contig_end; + r_ctl = FC_RCTL_DD_SOL_DATA; + } + fc_fcp_srr(fsp, r_ctl, offset); + } else if (e_stat & ESB_ST_SEQ_INIT) { + /* + * The remote port has the initiative, so just + * keep waiting for it to complete. + */ + fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); + } else { + + /* + * The exchange is incomplete, we have seq. initiative. + * Lost response with requested confirmation, + * lost confirmation, lost transfer ready or + * lost write data. + * + * For output, if not all data was received, ask + * for transfer ready to be repeated. + * + * If we received or sent all the data, send SRR to + * request response. + * + * If we lost a response, we may have lost some read + * data as well. + */ + r_ctl = FC_RCTL_DD_SOL_DATA; + if (data_dir == DMA_TO_DEVICE) { + r_ctl = FC_RCTL_DD_CMD_STATUS; + if (offset < fsp->data_len) + r_ctl = FC_RCTL_DD_DATA_DESC; + } else if (offset == fsp->xfer_contig_end) { + r_ctl = FC_RCTL_DD_CMD_STATUS; + } else if (fsp->xfer_contig_end < offset) { + offset = fsp->xfer_contig_end; + } + fc_fcp_srr(fsp, r_ctl, offset); + } + } +unlock_out: + fc_fcp_unlock_pkt(fsp); +out: + fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ + fc_frame_free(fp); +} + +/** + * fc_fcp_rec_error() - Handler for REC errors + * @fsp: The FCP packet the error is on + * @fp: The REC frame + */ +static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) +{ + int error = PTR_ERR(fp); + + if (fc_fcp_lock_pkt(fsp)) + goto out; + + switch (error) { + case -FC_EX_CLOSED: + fc_fcp_retry_cmd(fsp); + break; + + default: + FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n", + fsp, fsp->rport->port_id, error); + fsp->status_code = FC_CMD_PLOGO; + /* fall through */ + + case -FC_EX_TIMEOUT: + /* + * Assume REC or LS_ACC was lost. + * The exchange manager will have aborted REC, so retry. + */ + FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n", + fsp->rport->port_id, error, fsp->recov_retry, + FC_MAX_RECOV_RETRY); + if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) + fc_fcp_rec(fsp); + else + fc_fcp_recovery(fsp, FC_ERROR); + break; + } + fc_fcp_unlock_pkt(fsp); +out: + fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */ +} + +/** + * fc_fcp_recovery() - Handler for fcp_pkt recovery + * @fsp: The FCP pkt that needs to be aborted + */ +static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code) +{ + fsp->status_code = code; + fsp->cdb_status = 0; + fsp->io_status = 0; + /* + * if this fails then we let the scsi command timer fire and + * scsi-ml escalate. + */ + fc_fcp_send_abort(fsp); +} + +/** + * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request) + * @fsp: The FCP packet the SRR is to be sent on + * @r_ctl: The R_CTL field for the SRR request + * This is called after receiving status but insufficient data, or + * when expecting status but the request has timed out. + */ +static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset) +{ + struct fc_lport *lport = fsp->lp; + struct fc_rport *rport; + struct fc_rport_libfc_priv *rpriv; + struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr); + struct fc_seq *seq; + struct fcp_srr *srr; + struct fc_frame *fp; + unsigned int rec_tov; + + rport = fsp->rport; + rpriv = rport->dd_data; + + if (!(rpriv->flags & FC_RP_FLAGS_RETRY) || + rpriv->rp_state != RPORT_ST_READY) + goto retry; /* shouldn't happen */ + fp = fc_fcp_frame_alloc(lport, sizeof(*srr)); + if (!fp) + goto retry; + + srr = fc_frame_payload_get(fp, sizeof(*srr)); + memset(srr, 0, sizeof(*srr)); + srr->srr_op = ELS_SRR; + srr->srr_ox_id = htons(ep->oxid); + srr->srr_rx_id = htons(ep->rxid); + srr->srr_r_ctl = r_ctl; + srr->srr_rel_off = htonl(offset); + + fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id, + rpriv->local_port->port_id, FC_TYPE_FCP, + FC_FCTL_REQ, 0); + + rec_tov = get_fsp_rec_tov(fsp); + seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, + fc_fcp_pkt_destroy, + fsp, jiffies_to_msecs(rec_tov)); + if (!seq) + goto retry; + + fsp->recov_seq = seq; + fsp->xfer_len = offset; + fsp->xfer_contig_end = offset; + fsp->state &= ~FC_SRB_RCV_STATUS; + fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */ + return; +retry: + fc_fcp_retry_cmd(fsp); +} + +/** + * fc_fcp_srr_resp() - Handler for SRR response + * @seq: The sequence the SRR is on + * @fp: The SRR frame + * @arg: The FCP packet the SRR is on + */ +static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) +{ + struct fc_fcp_pkt *fsp = arg; + struct fc_frame_header *fh; + + if (IS_ERR(fp)) { + fc_fcp_srr_error(fsp, fp); + return; + } + + if (fc_fcp_lock_pkt(fsp)) + goto out; + + fh = fc_frame_header_get(fp); + /* + * BUG? fc_fcp_srr_error calls exch_done which would release + * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT, + * then fc_exch_timeout would be sending an abort. The exch_done + * call by fc_fcp_srr_error would prevent fc_exch.c from seeing + * an abort response though. + */ + if (fh->fh_type == FC_TYPE_BLS) { + fc_fcp_unlock_pkt(fsp); + return; + } + + switch (fc_frame_payload_op(fp)) { + case ELS_LS_ACC: + fsp->recov_retry = 0; + fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp)); + break; + case ELS_LS_RJT: + default: + fc_fcp_recovery(fsp, FC_ERROR); + break; + } + fc_fcp_unlock_pkt(fsp); +out: + fsp->lp->tt.exch_done(seq); + fc_frame_free(fp); +} + +/** + * fc_fcp_srr_error() - Handler for SRR errors + * @fsp: The FCP packet that the SRR error is on + * @fp: The SRR frame + */ +static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp) +{ + if (fc_fcp_lock_pkt(fsp)) + goto out; + switch (PTR_ERR(fp)) { + case -FC_EX_TIMEOUT: + if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY) + fc_fcp_rec(fsp); + else + fc_fcp_recovery(fsp, FC_TIMED_OUT); + break; + case -FC_EX_CLOSED: /* e.g., link failure */ + /* fall through */ + default: + fc_fcp_retry_cmd(fsp); + break; + } + fc_fcp_unlock_pkt(fsp); +out: + fsp->lp->tt.exch_done(fsp->recov_seq); +} + +/** + * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready + * @lport: The local port to be checked + */ +static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport) +{ + /* lock ? */ + return (lport->state == LPORT_ST_READY) && + lport->link_up && !lport->qfull; +} + +/** + * fc_queuecommand() - The queuecommand function of the SCSI template + * @shost: The Scsi_Host that the command was issued to + * @cmd: The scsi_cmnd to be executed + * + * This is the i/o strategy routine, called by the SCSI layer. + */ +int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd) +{ + struct fc_lport *lport = shost_priv(shost); + struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); + struct fc_fcp_pkt *fsp; + struct fc_rport_libfc_priv *rpriv; + int rval; + int rc = 0; + struct fc_stats *stats; + + rval = fc_remote_port_chkready(rport); + if (rval) { + sc_cmd->result = rval; + sc_cmd->scsi_done(sc_cmd); + return 0; + } + + if (!*(struct fc_remote_port **)rport->dd_data) { + /* + * rport is transitioning from blocked/deleted to + * online + */ + sc_cmd->result = DID_IMM_RETRY << 16; + sc_cmd->scsi_done(sc_cmd); + goto out; + } + + rpriv = rport->dd_data; + + if (!fc_fcp_lport_queue_ready(lport)) { + if (lport->qfull) + fc_fcp_can_queue_ramp_down(lport); + rc = SCSI_MLQUEUE_HOST_BUSY; + goto out; + } + + fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC); + if (fsp == NULL) { + rc = SCSI_MLQUEUE_HOST_BUSY; + goto out; + } + + /* + * build the libfc request pkt + */ + fsp->cmd = sc_cmd; /* save the cmd */ + fsp->rport = rport; /* set the remote port ptr */ + + /* + * set up the transfer length + */ + fsp->data_len = scsi_bufflen(sc_cmd); + fsp->xfer_len = 0; + + /* + * setup the data direction + */ + stats = per_cpu_ptr(lport->stats, get_cpu()); + if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) { + fsp->req_flags = FC_SRB_READ; + stats->InputRequests++; + stats->InputBytes += fsp->data_len; + } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) { + fsp->req_flags = FC_SRB_WRITE; + stats->OutputRequests++; + stats->OutputBytes += fsp->data_len; + } else { + fsp->req_flags = 0; + stats->ControlRequests++; + } + put_cpu(); + + /* + * send it to the lower layer + * if we get -1 return then put the request in the pending + * queue. + */ + rval = fc_fcp_pkt_send(lport, fsp); + if (rval != 0) { + fsp->state = FC_SRB_FREE; + fc_fcp_pkt_release(fsp); + rc = SCSI_MLQUEUE_HOST_BUSY; + } +out: + return rc; +} +EXPORT_SYMBOL(fc_queuecommand); + +/** + * fc_io_compl() - Handle responses for completed commands + * @fsp: The FCP packet that is complete + * + * Translates fcp_pkt errors to a Linux SCSI errors. + * The fcp packet lock must be held when calling. + */ +static void fc_io_compl(struct fc_fcp_pkt *fsp) +{ + struct fc_fcp_internal *si; + struct scsi_cmnd *sc_cmd; + struct fc_lport *lport; + unsigned long flags; + + /* release outstanding ddp context */ + fc_fcp_ddp_done(fsp); + + fsp->state |= FC_SRB_COMPL; + if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) { + spin_unlock_bh(&fsp->scsi_pkt_lock); + del_timer_sync(&fsp->timer); + spin_lock_bh(&fsp->scsi_pkt_lock); + } + + lport = fsp->lp; + si = fc_get_scsi_internal(lport); + + /* + * if can_queue ramp down is done then try can_queue ramp up + * since commands are completing now. + */ + if (si->last_can_queue_ramp_down_time) + fc_fcp_can_queue_ramp_up(lport); + + sc_cmd = fsp->cmd; + CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status; + switch (fsp->status_code) { + case FC_COMPLETE: + if (fsp->cdb_status == 0) { + /* + * good I/O status + */ + sc_cmd->result = DID_OK << 16; + if (fsp->scsi_resid) + CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; + } else { + /* + * transport level I/O was ok but scsi + * has non zero status + */ + sc_cmd->result = (DID_OK << 16) | fsp->cdb_status; + } + break; + case FC_ERROR: + FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " + "due to FC_ERROR\n"); + sc_cmd->result = DID_ERROR << 16; + break; + case FC_DATA_UNDRUN: + if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) { + /* + * scsi status is good but transport level + * underrun. + */ + if (fsp->state & FC_SRB_RCV_STATUS) { + sc_cmd->result = DID_OK << 16; + } else { + FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml" + " due to FC_DATA_UNDRUN (trans)\n"); + sc_cmd->result = DID_ERROR << 16; + } + } else { + /* + * scsi got underrun, this is an error + */ + FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " + "due to FC_DATA_UNDRUN (scsi)\n"); + CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid; + sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; + } + break; + case FC_DATA_OVRRUN: + /* + * overrun is an error + */ + FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " + "due to FC_DATA_OVRRUN\n"); + sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status; + break; + case FC_CMD_ABORTED: + FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " + "due to FC_CMD_ABORTED\n"); + sc_cmd->result = (DID_ERROR << 16) | fsp->io_status; + break; + case FC_CMD_RESET: + FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml " + "due to FC_CMD_RESET\n"); + sc_cmd->result = (DID_RESET << 16); + break; + case FC_HRD_ERROR: + FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml " + "due to FC_HRD_ERROR\n"); + sc_cmd->result = (DID_NO_CONNECT << 16); + break; + case FC_CRC_ERROR: + FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml " + "due to FC_CRC_ERROR\n"); + sc_cmd->result = (DID_PARITY << 16); + break; + case FC_TIMED_OUT: + FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml " + "due to FC_TIMED_OUT\n"); + sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status; + break; + default: + FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml " + "due to unknown error\n"); + sc_cmd->result = (DID_ERROR << 16); + break; + } + + if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) + sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16); + + spin_lock_irqsave(&si->scsi_queue_lock, flags); + list_del(&fsp->list); + sc_cmd->SCp.ptr = NULL; + spin_unlock_irqrestore(&si->scsi_queue_lock, flags); + sc_cmd->scsi_done(sc_cmd); + + /* release ref from initial allocation in queue command */ + fc_fcp_pkt_release(fsp); +} + +/** + * fc_eh_abort() - Abort a command + * @sc_cmd: The SCSI command to abort + * + * From SCSI host template. + * Send an ABTS to the target device and wait for the response. + */ +int fc_eh_abort(struct scsi_cmnd *sc_cmd) +{ + struct fc_fcp_pkt *fsp; + struct fc_lport *lport; + struct fc_fcp_internal *si; + int rc = FAILED; + unsigned long flags; + int rval; + + rval = fc_block_scsi_eh(sc_cmd); + if (rval) + return rval; + + lport = shost_priv(sc_cmd->device->host); + if (lport->state != LPORT_ST_READY) + return rc; + else if (!lport->link_up) + return rc; + + si = fc_get_scsi_internal(lport); + spin_lock_irqsave(&si->scsi_queue_lock, flags); + fsp = CMD_SP(sc_cmd); + if (!fsp) { + /* command completed while scsi eh was setting up */ + spin_unlock_irqrestore(&si->scsi_queue_lock, flags); + return SUCCESS; + } + /* grab a ref so the fsp and sc_cmd cannot be released from under us */ + fc_fcp_pkt_hold(fsp); + spin_unlock_irqrestore(&si->scsi_queue_lock, flags); + + if (fc_fcp_lock_pkt(fsp)) { + /* completed while we were waiting for timer to be deleted */ + rc = SUCCESS; + goto release_pkt; + } + + rc = fc_fcp_pkt_abort(fsp); + fc_fcp_unlock_pkt(fsp); + +release_pkt: + fc_fcp_pkt_release(fsp); + return rc; +} +EXPORT_SYMBOL(fc_eh_abort); + +/** + * fc_eh_device_reset() - Reset a single LUN + * @sc_cmd: The SCSI command which identifies the device whose + * LUN is to be reset + * + * Set from SCSI host template. + */ +int fc_eh_device_reset(struct scsi_cmnd *sc_cmd) +{ + struct fc_lport *lport; + struct fc_fcp_pkt *fsp; + struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device)); + int rc = FAILED; + int rval; + + rval = fc_block_scsi_eh(sc_cmd); + if (rval) + return rval; + + lport = shost_priv(sc_cmd->device->host); + + if (lport->state != LPORT_ST_READY) + return rc; + + FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id); + + fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO); + if (fsp == NULL) { + printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n"); + goto out; + } + + /* + * Build the libfc request pkt. Do not set the scsi cmnd, because + * the sc passed in is not setup for execution like when sent + * through the queuecommand callout. + */ + fsp->rport = rport; /* set the remote port ptr */ + + /* + * flush outstanding commands + */ + rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun); + fsp->state = FC_SRB_FREE; + fc_fcp_pkt_release(fsp); + +out: + return rc; +} +EXPORT_SYMBOL(fc_eh_device_reset); + +/** + * fc_eh_host_reset() - Reset a Scsi_Host. + * @sc_cmd: The SCSI command that identifies the SCSI host to be reset + */ +int fc_eh_host_reset(struct scsi_cmnd *sc_cmd) +{ + struct Scsi_Host *shost = sc_cmd->device->host; + struct fc_lport *lport = shost_priv(shost); + unsigned long wait_tmo; + + FC_SCSI_DBG(lport, "Resetting host\n"); + + fc_block_scsi_eh(sc_cmd); + + lport->tt.lport_reset(lport); + wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT; + while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies, + wait_tmo)) + msleep(1000); + + if (fc_fcp_lport_queue_ready(lport)) { + shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded " + "on port (%6.6x)\n", lport->port_id); + return SUCCESS; + } else { + shost_printk(KERN_INFO, shost, "libfc: Host reset failed, " + "port (%6.6x) is not ready.\n", + lport->port_id); + return FAILED; + } +} +EXPORT_SYMBOL(fc_eh_host_reset); + +/** + * fc_slave_alloc() - Configure the queue depth of a Scsi_Host + * @sdev: The SCSI device that identifies the SCSI host + * + * Configures queue depth based on host's cmd_per_len. If not set + * then we use the libfc default. + */ +int fc_slave_alloc(struct scsi_device *sdev) +{ + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); + + if (!rport || fc_remote_port_chkready(rport)) + return -ENXIO; + + scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH); + return 0; +} +EXPORT_SYMBOL(fc_slave_alloc); + +/** + * fc_fcp_destory() - Tear down the FCP layer for a given local port + * @lport: The local port that no longer needs the FCP layer + */ +void fc_fcp_destroy(struct fc_lport *lport) +{ + struct fc_fcp_internal *si = fc_get_scsi_internal(lport); + + if (!list_empty(&si->scsi_pkt_queue)) + printk(KERN_ERR "libfc: Leaked SCSI packets when destroying " + "port (%6.6x)\n", lport->port_id); + + mempool_destroy(si->scsi_pkt_pool); + kfree(si); + lport->scsi_priv = NULL; +} +EXPORT_SYMBOL(fc_fcp_destroy); + +int fc_setup_fcp(void) +{ + int rc = 0; + + scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt", + sizeof(struct fc_fcp_pkt), + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!scsi_pkt_cachep) { + printk(KERN_ERR "libfc: Unable to allocate SRB cache, " + "module load failed!"); + rc = -ENOMEM; + } + + return rc; +} + +void fc_destroy_fcp(void) +{ + if (scsi_pkt_cachep) + kmem_cache_destroy(scsi_pkt_cachep); +} + +/** + * fc_fcp_init() - Initialize the FCP layer for a local port + * @lport: The local port to initialize the exchange layer for + */ +int fc_fcp_init(struct fc_lport *lport) +{ + int rc; + struct fc_fcp_internal *si; + + if (!lport->tt.fcp_cmd_send) + lport->tt.fcp_cmd_send = fc_fcp_cmd_send; + + if (!lport->tt.fcp_cleanup) + lport->tt.fcp_cleanup = fc_fcp_cleanup; + + if (!lport->tt.fcp_abort_io) + lport->tt.fcp_abort_io = fc_fcp_abort_io; + + si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL); + if (!si) + return -ENOMEM; + lport->scsi_priv = si; + si->max_can_queue = lport->host->can_queue; + INIT_LIST_HEAD(&si->scsi_pkt_queue); + spin_lock_init(&si->scsi_queue_lock); + + si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep); + if (!si->scsi_pkt_pool) { + rc = -ENOMEM; + goto free_internal; + } + return 0; + +free_internal: + kfree(si); + return rc; +} +EXPORT_SYMBOL(fc_fcp_init); diff --git a/kernel/drivers/scsi/libfc/fc_frame.c b/kernel/drivers/scsi/libfc/fc_frame.c new file mode 100644 index 000000000..0382ac069 --- /dev/null +++ b/kernel/drivers/scsi/libfc/fc_frame.c @@ -0,0 +1,91 @@ +/* + * Copyright(c) 2007 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +/* + * Frame allocation. + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/skbuff.h> +#include <linux/crc32.h> +#include <linux/gfp.h> + +#include <scsi/fc_frame.h> + +/* + * Check the CRC in a frame. + */ +u32 fc_frame_crc_check(struct fc_frame *fp) +{ + u32 crc; + u32 error; + const u8 *bp; + unsigned int len; + + WARN_ON(!fc_frame_is_linear(fp)); + fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; + len = (fr_len(fp) + 3) & ~3; /* round up length to include fill */ + bp = (const u8 *) fr_hdr(fp); + crc = ~crc32(~0, bp, len); + error = crc ^ fr_crc(fp); + return error; +} +EXPORT_SYMBOL(fc_frame_crc_check); + +/* + * Allocate a frame intended to be sent. + * Get an sk_buff for the frame and set the length. + */ +struct fc_frame *_fc_frame_alloc(size_t len) +{ + struct fc_frame *fp; + struct sk_buff *skb; + + WARN_ON((len % sizeof(u32)) != 0); + len += sizeof(struct fc_frame_header); + skb = alloc_skb_fclone(len + FC_FRAME_HEADROOM + FC_FRAME_TAILROOM + + NET_SKB_PAD, GFP_ATOMIC); + if (!skb) + return NULL; + skb_reserve(skb, NET_SKB_PAD + FC_FRAME_HEADROOM); + fp = (struct fc_frame *) skb; + fc_frame_init(fp); + skb_put(skb, len); + return fp; +} +EXPORT_SYMBOL(_fc_frame_alloc); + +struct fc_frame *fc_frame_alloc_fill(struct fc_lport *lp, size_t payload_len) +{ + struct fc_frame *fp; + size_t fill; + + fill = payload_len % 4; + if (fill != 0) + fill = 4 - fill; + fp = _fc_frame_alloc(payload_len + fill); + if (fp) { + memset((char *) fr_hdr(fp) + payload_len, 0, fill); + /* trim is OK, we just allocated it so there are no fragments */ + skb_trim(fp_skb(fp), + payload_len + sizeof(struct fc_frame_header)); + } + return fp; +} +EXPORT_SYMBOL(fc_frame_alloc_fill); diff --git a/kernel/drivers/scsi/libfc/fc_libfc.c b/kernel/drivers/scsi/libfc/fc_libfc.c new file mode 100644 index 000000000..c11a638f3 --- /dev/null +++ b/kernel/drivers/scsi/libfc/fc_libfc.c @@ -0,0 +1,331 @@ +/* + * Copyright(c) 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/scatterlist.h> +#include <linux/crc32.h> +#include <linux/module.h> + +#include <scsi/libfc.h> +#include <scsi/fc_encode.h> + +#include "fc_libfc.h" + +MODULE_AUTHOR("Open-FCoE.org"); +MODULE_DESCRIPTION("libfc"); +MODULE_LICENSE("GPL v2"); + +unsigned int fc_debug_logging; +module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); + +DEFINE_MUTEX(fc_prov_mutex); +static LIST_HEAD(fc_local_ports); +struct blocking_notifier_head fc_lport_notifier_head = + BLOCKING_NOTIFIER_INIT(fc_lport_notifier_head); +EXPORT_SYMBOL(fc_lport_notifier_head); + +/* + * Providers which primarily send requests and PRLIs. + */ +struct fc4_prov *fc_active_prov[FC_FC4_PROV_SIZE] = { + [0] = &fc_rport_t0_prov, + [FC_TYPE_FCP] = &fc_rport_fcp_init, +}; + +/* + * Providers which receive requests. + */ +struct fc4_prov *fc_passive_prov[FC_FC4_PROV_SIZE] = { + [FC_TYPE_ELS] = &fc_lport_els_prov, +}; + +/** + * libfc_init() - Initialize libfc.ko + */ +static int __init libfc_init(void) +{ + int rc = 0; + + rc = fc_setup_fcp(); + if (rc) + return rc; + + rc = fc_setup_exch_mgr(); + if (rc) + goto destroy_pkt_cache; + + rc = fc_setup_rport(); + if (rc) + goto destroy_em; + + return rc; +destroy_em: + fc_destroy_exch_mgr(); +destroy_pkt_cache: + fc_destroy_fcp(); + return rc; +} +module_init(libfc_init); + +/** + * libfc_exit() - Tear down libfc.ko + */ +static void __exit libfc_exit(void) +{ + fc_destroy_fcp(); + fc_destroy_exch_mgr(); + fc_destroy_rport(); +} +module_exit(libfc_exit); + +/** + * fc_copy_buffer_to_sglist() - This routine copies the data of a buffer + * into a scatter-gather list (SG list). + * + * @buf: pointer to the data buffer. + * @len: the byte-length of the data buffer. + * @sg: pointer to the pointer of the SG list. + * @nents: pointer to the remaining number of entries in the SG list. + * @offset: pointer to the current offset in the SG list. + * @crc: pointer to the 32-bit crc value. + * If crc is NULL, CRC is not calculated. + */ +u32 fc_copy_buffer_to_sglist(void *buf, size_t len, + struct scatterlist *sg, + u32 *nents, size_t *offset, + u32 *crc) +{ + size_t remaining = len; + u32 copy_len = 0; + + while (remaining > 0 && sg) { + size_t off, sg_bytes; + void *page_addr; + + if (*offset >= sg->length) { + /* + * Check for end and drop resources + * from the last iteration. + */ + if (!(*nents)) + break; + --(*nents); + *offset -= sg->length; + sg = sg_next(sg); + continue; + } + sg_bytes = min(remaining, sg->length - *offset); + + /* + * The scatterlist item may be bigger than PAGE_SIZE, + * but we are limited to mapping PAGE_SIZE at a time. + */ + off = *offset + sg->offset; + sg_bytes = min(sg_bytes, + (size_t)(PAGE_SIZE - (off & ~PAGE_MASK))); + page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT)); + if (crc) + *crc = crc32(*crc, buf, sg_bytes); + memcpy((char *)page_addr + (off & ~PAGE_MASK), buf, sg_bytes); + kunmap_atomic(page_addr); + buf += sg_bytes; + *offset += sg_bytes; + remaining -= sg_bytes; + copy_len += sg_bytes; + } + return copy_len; +} + +/** + * fc_fill_hdr() - fill FC header fields based on request + * @fp: reply frame containing header to be filled in + * @in_fp: request frame containing header to use in filling in reply + * @r_ctl: R_CTL value for header + * @f_ctl: F_CTL value for header, with 0 pad + * @seq_cnt: sequence count for the header, ignored if frame has a sequence + * @parm_offset: parameter / offset value + */ +void fc_fill_hdr(struct fc_frame *fp, const struct fc_frame *in_fp, + enum fc_rctl r_ctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset) +{ + struct fc_frame_header *fh; + struct fc_frame_header *in_fh; + struct fc_seq *sp; + u32 fill; + + fh = __fc_frame_header_get(fp); + in_fh = __fc_frame_header_get(in_fp); + + if (f_ctl & FC_FC_END_SEQ) { + fill = -fr_len(fp) & 3; + if (fill) { + /* TODO, this may be a problem with fragmented skb */ + memset(skb_put(fp_skb(fp), fill), 0, fill); + f_ctl |= fill; + } + fr_eof(fp) = FC_EOF_T; + } else { + WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ + fr_eof(fp) = FC_EOF_N; + } + + fh->fh_r_ctl = r_ctl; + memcpy(fh->fh_d_id, in_fh->fh_s_id, sizeof(fh->fh_d_id)); + memcpy(fh->fh_s_id, in_fh->fh_d_id, sizeof(fh->fh_s_id)); + fh->fh_type = in_fh->fh_type; + hton24(fh->fh_f_ctl, f_ctl); + fh->fh_ox_id = in_fh->fh_ox_id; + fh->fh_rx_id = in_fh->fh_rx_id; + fh->fh_cs_ctl = 0; + fh->fh_df_ctl = 0; + fh->fh_parm_offset = htonl(parm_offset); + + sp = fr_seq(in_fp); + if (sp) { + fr_seq(fp) = sp; + fh->fh_seq_id = sp->id; + seq_cnt = sp->cnt; + } else { + fh->fh_seq_id = 0; + } + fh->fh_seq_cnt = ntohs(seq_cnt); + fr_sof(fp) = seq_cnt ? FC_SOF_N3 : FC_SOF_I3; + fr_encaps(fp) = fr_encaps(in_fp); +} +EXPORT_SYMBOL(fc_fill_hdr); + +/** + * fc_fill_reply_hdr() - fill FC reply header fields based on request + * @fp: reply frame containing header to be filled in + * @in_fp: request frame containing header to use in filling in reply + * @r_ctl: R_CTL value for reply + * @parm_offset: parameter / offset value + */ +void fc_fill_reply_hdr(struct fc_frame *fp, const struct fc_frame *in_fp, + enum fc_rctl r_ctl, u32 parm_offset) +{ + struct fc_seq *sp; + + sp = fr_seq(in_fp); + if (sp) + fr_seq(fp) = fr_dev(in_fp)->tt.seq_start_next(sp); + fc_fill_hdr(fp, in_fp, r_ctl, FC_FCTL_RESP, 0, parm_offset); +} +EXPORT_SYMBOL(fc_fill_reply_hdr); + +/** + * fc_fc4_conf_lport_params() - Modify "service_params" of specified lport + * if there is service provider (target provider) registered with libfc + * for specified "fc_ft_type" + * @lport: Local port which service_params needs to be modified + * @type: FC-4 type, such as FC_TYPE_FCP + */ +void fc_fc4_conf_lport_params(struct fc_lport *lport, enum fc_fh_type type) +{ + struct fc4_prov *prov_entry; + BUG_ON(type >= FC_FC4_PROV_SIZE); + BUG_ON(!lport); + prov_entry = fc_passive_prov[type]; + if (type == FC_TYPE_FCP) { + if (prov_entry && prov_entry->recv) + lport->service_params |= FCP_SPPF_TARG_FCN; + } +} + +void fc_lport_iterate(void (*notify)(struct fc_lport *, void *), void *arg) +{ + struct fc_lport *lport; + + mutex_lock(&fc_prov_mutex); + list_for_each_entry(lport, &fc_local_ports, lport_list) + notify(lport, arg); + mutex_unlock(&fc_prov_mutex); +} +EXPORT_SYMBOL(fc_lport_iterate); + +/** + * fc_fc4_register_provider() - register FC-4 upper-level provider. + * @type: FC-4 type, such as FC_TYPE_FCP + * @prov: structure describing provider including ops vector. + * + * Returns 0 on success, negative error otherwise. + */ +int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *prov) +{ + struct fc4_prov **prov_entry; + int ret = 0; + + if (type >= FC_FC4_PROV_SIZE) + return -EINVAL; + mutex_lock(&fc_prov_mutex); + prov_entry = (prov->recv ? fc_passive_prov : fc_active_prov) + type; + if (*prov_entry) + ret = -EBUSY; + else + *prov_entry = prov; + mutex_unlock(&fc_prov_mutex); + return ret; +} +EXPORT_SYMBOL(fc_fc4_register_provider); + +/** + * fc_fc4_deregister_provider() - deregister FC-4 upper-level provider. + * @type: FC-4 type, such as FC_TYPE_FCP + * @prov: structure describing provider including ops vector. + */ +void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *prov) +{ + BUG_ON(type >= FC_FC4_PROV_SIZE); + mutex_lock(&fc_prov_mutex); + if (prov->recv) + RCU_INIT_POINTER(fc_passive_prov[type], NULL); + else + RCU_INIT_POINTER(fc_active_prov[type], NULL); + mutex_unlock(&fc_prov_mutex); + synchronize_rcu(); +} +EXPORT_SYMBOL(fc_fc4_deregister_provider); + +/** + * fc_fc4_add_lport() - add new local port to list and run notifiers. + * @lport: The new local port. + */ +void fc_fc4_add_lport(struct fc_lport *lport) +{ + mutex_lock(&fc_prov_mutex); + list_add_tail(&lport->lport_list, &fc_local_ports); + blocking_notifier_call_chain(&fc_lport_notifier_head, + FC_LPORT_EV_ADD, lport); + mutex_unlock(&fc_prov_mutex); +} + +/** + * fc_fc4_del_lport() - remove local port from list and run notifiers. + * @lport: The new local port. + */ +void fc_fc4_del_lport(struct fc_lport *lport) +{ + mutex_lock(&fc_prov_mutex); + list_del(&lport->lport_list); + blocking_notifier_call_chain(&fc_lport_notifier_head, + FC_LPORT_EV_DEL, lport); + mutex_unlock(&fc_prov_mutex); +} diff --git a/kernel/drivers/scsi/libfc/fc_libfc.h b/kernel/drivers/scsi/libfc/fc_libfc.h new file mode 100644 index 000000000..b74189d89 --- /dev/null +++ b/kernel/drivers/scsi/libfc/fc_libfc.h @@ -0,0 +1,139 @@ +/* + * Copyright(c) 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +#ifndef _FC_LIBFC_H_ +#define _FC_LIBFC_H_ + +#define FC_LIBFC_LOGGING 0x01 /* General logging, not categorized */ +#define FC_LPORT_LOGGING 0x02 /* lport layer logging */ +#define FC_DISC_LOGGING 0x04 /* discovery layer logging */ +#define FC_RPORT_LOGGING 0x08 /* rport layer logging */ +#define FC_FCP_LOGGING 0x10 /* I/O path logging */ +#define FC_EM_LOGGING 0x20 /* Exchange Manager logging */ +#define FC_EXCH_LOGGING 0x40 /* Exchange/Sequence logging */ +#define FC_SCSI_LOGGING 0x80 /* SCSI logging (mostly error handling) */ + +extern unsigned int fc_debug_logging; + +#define FC_CHECK_LOGGING(LEVEL, CMD) \ + do { \ + if (unlikely(fc_debug_logging & LEVEL)) \ + do { \ + CMD; \ + } while (0); \ + } while (0) + +#define FC_LIBFC_DBG(fmt, args...) \ + FC_CHECK_LOGGING(FC_LIBFC_LOGGING, \ + pr_info("libfc: " fmt, ##args)) + +#define FC_LPORT_DBG(lport, fmt, args...) \ + FC_CHECK_LOGGING(FC_LPORT_LOGGING, \ + pr_info("host%u: lport %6.6x: " fmt, \ + (lport)->host->host_no, \ + (lport)->port_id, ##args)) + +#define FC_DISC_DBG(disc, fmt, args...) \ + FC_CHECK_LOGGING(FC_DISC_LOGGING, \ + pr_info("host%u: disc: " fmt, \ + fc_disc_lport(disc)->host->host_no, \ + ##args)) + +#define FC_RPORT_ID_DBG(lport, port_id, fmt, args...) \ + FC_CHECK_LOGGING(FC_RPORT_LOGGING, \ + pr_info("host%u: rport %6.6x: " fmt, \ + (lport)->host->host_no, \ + (port_id), ##args)) + +#define FC_RPORT_DBG(rdata, fmt, args...) \ + FC_RPORT_ID_DBG((rdata)->local_port, (rdata)->ids.port_id, fmt, ##args) + +#define FC_FCP_DBG(pkt, fmt, args...) \ + FC_CHECK_LOGGING(FC_FCP_LOGGING, \ + { \ + if ((pkt)->seq_ptr) { \ + struct fc_exch *_ep = NULL; \ + _ep = fc_seq_exch((pkt)->seq_ptr); \ + pr_info("host%u: fcp: %6.6x: " \ + "xid %04x-%04x: " fmt, \ + (pkt)->lp->host->host_no, \ + (pkt)->rport->port_id, \ + (_ep)->oxid, (_ep)->rxid, ##args); \ + } else { \ + pr_info("host%u: fcp: %6.6x: " fmt, \ + (pkt)->lp->host->host_no, \ + (pkt)->rport->port_id, ##args); \ + } \ + }) + +#define FC_EXCH_DBG(exch, fmt, args...) \ + FC_CHECK_LOGGING(FC_EXCH_LOGGING, \ + pr_info("host%u: xid %4x: " fmt, \ + (exch)->lp->host->host_no, \ + exch->xid, ##args)) + +#define FC_SCSI_DBG(lport, fmt, args...) \ + FC_CHECK_LOGGING(FC_SCSI_LOGGING, \ + pr_info("host%u: scsi: " fmt, \ + (lport)->host->host_no, ##args)) + +/* + * FC-4 Providers. + */ +extern struct fc4_prov *fc_active_prov[]; /* providers without recv */ +extern struct fc4_prov *fc_passive_prov[]; /* providers with recv */ +extern struct mutex fc_prov_mutex; /* lock over table changes */ + +extern struct fc4_prov fc_rport_t0_prov; /* type 0 provider */ +extern struct fc4_prov fc_lport_els_prov; /* ELS provider */ +extern struct fc4_prov fc_rport_fcp_init; /* FCP initiator provider */ + +/* + * Set up direct-data placement for this I/O request + */ +void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid); +void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp); + +/* + * Module setup functions + */ +int fc_setup_exch_mgr(void); +void fc_destroy_exch_mgr(void); +int fc_setup_rport(void); +void fc_destroy_rport(void); +int fc_setup_fcp(void); +void fc_destroy_fcp(void); + +/* + * Internal libfc functions + */ +const char *fc_els_resp_type(struct fc_frame *); +extern void fc_fc4_add_lport(struct fc_lport *); +extern void fc_fc4_del_lport(struct fc_lport *); +extern void fc_fc4_conf_lport_params(struct fc_lport *, enum fc_fh_type); + +/* + * Copies a buffer into an sg list + */ +u32 fc_copy_buffer_to_sglist(void *buf, size_t len, + struct scatterlist *sg, + u32 *nents, size_t *offset, + u32 *crc); + +#endif /* _FC_LIBFC_H_ */ diff --git a/kernel/drivers/scsi/libfc/fc_lport.c b/kernel/drivers/scsi/libfc/fc_lport.c new file mode 100644 index 000000000..e01a29863 --- /dev/null +++ b/kernel/drivers/scsi/libfc/fc_lport.c @@ -0,0 +1,2144 @@ +/* + * Copyright(c) 2007 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +/* + * PORT LOCKING NOTES + * + * These comments only apply to the 'port code' which consists of the lport, + * disc and rport blocks. + * + * MOTIVATION + * + * The lport, disc and rport blocks all have mutexes that are used to protect + * those objects. The main motivation for these locks is to prevent from + * having an lport reset just before we send a frame. In that scenario the + * lport's FID would get set to zero and then we'd send a frame with an + * invalid SID. We also need to ensure that states don't change unexpectedly + * while processing another state. + * + * HIERARCHY + * + * The following hierarchy defines the locking rules. A greater lock + * may be held before acquiring a lesser lock, but a lesser lock should never + * be held while attempting to acquire a greater lock. Here is the hierarchy- + * + * lport > disc, lport > rport, disc > rport + * + * CALLBACKS + * + * The callbacks cause complications with this scheme. There is a callback + * from the rport (to either lport or disc) and a callback from disc + * (to the lport). + * + * As rports exit the rport state machine a callback is made to the owner of + * the rport to notify success or failure. Since the callback is likely to + * cause the lport or disc to grab its lock we cannot hold the rport lock + * while making the callback. To ensure that the rport is not free'd while + * processing the callback the rport callbacks are serialized through a + * single-threaded workqueue. An rport would never be free'd while in a + * callback handler because no other rport work in this queue can be executed + * at the same time. + * + * When discovery succeeds or fails a callback is made to the lport as + * notification. Currently, successful discovery causes the lport to take no + * action. A failure will cause the lport to reset. There is likely a circular + * locking problem with this implementation. + */ + +/* + * LPORT LOCKING + * + * The critical sections protected by the lport's mutex are quite broad and + * may be improved upon in the future. The lport code and its locking doesn't + * influence the I/O path, so excessive locking doesn't penalize I/O + * performance. + * + * The strategy is to lock whenever processing a request or response. Note + * that every _enter_* function corresponds to a state change. They generally + * change the lports state and then send a request out on the wire. We lock + * before calling any of these functions to protect that state change. This + * means that the entry points into the lport block manage the locks while + * the state machine can transition between states (i.e. _enter_* functions) + * while always staying protected. + * + * When handling responses we also hold the lport mutex broadly. When the + * lport receives the response frame it locks the mutex and then calls the + * appropriate handler for the particuar response. Generally a response will + * trigger a state change and so the lock must already be held. + * + * Retries also have to consider the locking. The retries occur from a work + * context and the work function will lock the lport and then retry the state + * (i.e. _enter_* function). + */ + +#include <linux/timer.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <asm/unaligned.h> + +#include <scsi/fc/fc_gs.h> + +#include <scsi/libfc.h> +#include <scsi/fc_encode.h> +#include <linux/scatterlist.h> + +#include "fc_libfc.h" + +/* Fabric IDs to use for point-to-point mode, chosen on whims. */ +#define FC_LOCAL_PTP_FID_LO 0x010101 +#define FC_LOCAL_PTP_FID_HI 0x010102 + +#define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/ + +static void fc_lport_error(struct fc_lport *, struct fc_frame *); + +static void fc_lport_enter_reset(struct fc_lport *); +static void fc_lport_enter_flogi(struct fc_lport *); +static void fc_lport_enter_dns(struct fc_lport *); +static void fc_lport_enter_ns(struct fc_lport *, enum fc_lport_state); +static void fc_lport_enter_scr(struct fc_lport *); +static void fc_lport_enter_ready(struct fc_lport *); +static void fc_lport_enter_logo(struct fc_lport *); +static void fc_lport_enter_fdmi(struct fc_lport *lport); +static void fc_lport_enter_ms(struct fc_lport *, enum fc_lport_state); + +static const char *fc_lport_state_names[] = { + [LPORT_ST_DISABLED] = "disabled", + [LPORT_ST_FLOGI] = "FLOGI", + [LPORT_ST_DNS] = "dNS", + [LPORT_ST_RNN_ID] = "RNN_ID", + [LPORT_ST_RSNN_NN] = "RSNN_NN", + [LPORT_ST_RSPN_ID] = "RSPN_ID", + [LPORT_ST_RFT_ID] = "RFT_ID", + [LPORT_ST_RFF_ID] = "RFF_ID", + [LPORT_ST_FDMI] = "FDMI", + [LPORT_ST_RHBA] = "RHBA", + [LPORT_ST_RPA] = "RPA", + [LPORT_ST_DHBA] = "DHBA", + [LPORT_ST_DPRT] = "DPRT", + [LPORT_ST_SCR] = "SCR", + [LPORT_ST_READY] = "Ready", + [LPORT_ST_LOGO] = "LOGO", + [LPORT_ST_RESET] = "reset", +}; + +/** + * struct fc_bsg_info - FC Passthrough managemet structure + * @job: The passthrough job + * @lport: The local port to pass through a command + * @rsp_code: The expected response code + * @sg: job->reply_payload.sg_list + * @nents: job->reply_payload.sg_cnt + * @offset: The offset into the response data + */ +struct fc_bsg_info { + struct fc_bsg_job *job; + struct fc_lport *lport; + u16 rsp_code; + struct scatterlist *sg; + u32 nents; + size_t offset; +}; + +/** + * fc_frame_drop() - Dummy frame handler + * @lport: The local port the frame was received on + * @fp: The received frame + */ +static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp) +{ + fc_frame_free(fp); + return 0; +} + +/** + * fc_lport_rport_callback() - Event handler for rport events + * @lport: The lport which is receiving the event + * @rdata: private remote port data + * @event: The event that occurred + * + * Locking Note: The rport lock should not be held when calling + * this function. + */ +static void fc_lport_rport_callback(struct fc_lport *lport, + struct fc_rport_priv *rdata, + enum fc_rport_event event) +{ + FC_LPORT_DBG(lport, "Received a %d event for port (%6.6x)\n", event, + rdata->ids.port_id); + + mutex_lock(&lport->lp_mutex); + switch (event) { + case RPORT_EV_READY: + if (lport->state == LPORT_ST_DNS) { + lport->dns_rdata = rdata; + fc_lport_enter_ns(lport, LPORT_ST_RNN_ID); + } else if (lport->state == LPORT_ST_FDMI) { + lport->ms_rdata = rdata; + fc_lport_enter_ms(lport, LPORT_ST_DHBA); + } else { + FC_LPORT_DBG(lport, "Received an READY event " + "on port (%6.6x) for the directory " + "server, but the lport is not " + "in the DNS or FDMI state, it's in the " + "%d state", rdata->ids.port_id, + lport->state); + lport->tt.rport_logoff(rdata); + } + break; + case RPORT_EV_LOGO: + case RPORT_EV_FAILED: + case RPORT_EV_STOP: + if (rdata->ids.port_id == FC_FID_DIR_SERV) + lport->dns_rdata = NULL; + else if (rdata->ids.port_id == FC_FID_MGMT_SERV) + lport->ms_rdata = NULL; + break; + case RPORT_EV_NONE: + break; + } + mutex_unlock(&lport->lp_mutex); +} + +/** + * fc_lport_state() - Return a string which represents the lport's state + * @lport: The lport whose state is to converted to a string + */ +static const char *fc_lport_state(struct fc_lport *lport) +{ + const char *cp; + + cp = fc_lport_state_names[lport->state]; + if (!cp) + cp = "unknown"; + return cp; +} + +/** + * fc_lport_ptp_setup() - Create an rport for point-to-point mode + * @lport: The lport to attach the ptp rport to + * @remote_fid: The FID of the ptp rport + * @remote_wwpn: The WWPN of the ptp rport + * @remote_wwnn: The WWNN of the ptp rport + */ +static void fc_lport_ptp_setup(struct fc_lport *lport, + u32 remote_fid, u64 remote_wwpn, + u64 remote_wwnn) +{ + mutex_lock(&lport->disc.disc_mutex); + if (lport->ptp_rdata) { + lport->tt.rport_logoff(lport->ptp_rdata); + kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy); + } + lport->ptp_rdata = lport->tt.rport_create(lport, remote_fid); + kref_get(&lport->ptp_rdata->kref); + lport->ptp_rdata->ids.port_name = remote_wwpn; + lport->ptp_rdata->ids.node_name = remote_wwnn; + mutex_unlock(&lport->disc.disc_mutex); + + lport->tt.rport_login(lport->ptp_rdata); + + fc_lport_enter_ready(lport); +} + +/** + * fc_get_host_port_state() - Return the port state of the given Scsi_Host + * @shost: The SCSI host whose port state is to be determined + */ +void fc_get_host_port_state(struct Scsi_Host *shost) +{ + struct fc_lport *lport = shost_priv(shost); + + mutex_lock(&lport->lp_mutex); + if (!lport->link_up) + fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; + else + switch (lport->state) { + case LPORT_ST_READY: + fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; + break; + default: + fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; + } + mutex_unlock(&lport->lp_mutex); +} +EXPORT_SYMBOL(fc_get_host_port_state); + +/** + * fc_get_host_speed() - Return the speed of the given Scsi_Host + * @shost: The SCSI host whose port speed is to be determined + */ +void fc_get_host_speed(struct Scsi_Host *shost) +{ + struct fc_lport *lport = shost_priv(shost); + + fc_host_speed(shost) = lport->link_speed; +} +EXPORT_SYMBOL(fc_get_host_speed); + +/** + * fc_get_host_stats() - Return the Scsi_Host's statistics + * @shost: The SCSI host whose statistics are to be returned + */ +struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost) +{ + struct fc_host_statistics *fc_stats; + struct fc_lport *lport = shost_priv(shost); + struct timespec v0, v1; + unsigned int cpu; + u64 fcp_in_bytes = 0; + u64 fcp_out_bytes = 0; + + fc_stats = &lport->host_stats; + memset(fc_stats, 0, sizeof(struct fc_host_statistics)); + + jiffies_to_timespec(jiffies, &v0); + jiffies_to_timespec(lport->boot_time, &v1); + fc_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec); + + for_each_possible_cpu(cpu) { + struct fc_stats *stats; + + stats = per_cpu_ptr(lport->stats, cpu); + + fc_stats->tx_frames += stats->TxFrames; + fc_stats->tx_words += stats->TxWords; + fc_stats->rx_frames += stats->RxFrames; + fc_stats->rx_words += stats->RxWords; + fc_stats->error_frames += stats->ErrorFrames; + fc_stats->invalid_crc_count += stats->InvalidCRCCount; + fc_stats->fcp_input_requests += stats->InputRequests; + fc_stats->fcp_output_requests += stats->OutputRequests; + fc_stats->fcp_control_requests += stats->ControlRequests; + fcp_in_bytes += stats->InputBytes; + fcp_out_bytes += stats->OutputBytes; + fc_stats->fcp_packet_alloc_failures += stats->FcpPktAllocFails; + fc_stats->fcp_packet_aborts += stats->FcpPktAborts; + fc_stats->fcp_frame_alloc_failures += stats->FcpFrameAllocFails; + fc_stats->link_failure_count += stats->LinkFailureCount; + } + fc_stats->fcp_input_megabytes = div_u64(fcp_in_bytes, 1000000); + fc_stats->fcp_output_megabytes = div_u64(fcp_out_bytes, 1000000); + fc_stats->lip_count = -1; + fc_stats->nos_count = -1; + fc_stats->loss_of_sync_count = -1; + fc_stats->loss_of_signal_count = -1; + fc_stats->prim_seq_protocol_err_count = -1; + fc_stats->dumped_frames = -1; + + /* update exches stats */ + fc_exch_update_stats(lport); + + return fc_stats; +} +EXPORT_SYMBOL(fc_get_host_stats); + +/** + * fc_lport_flogi_fill() - Fill in FLOGI command for request + * @lport: The local port the FLOGI is for + * @flogi: The FLOGI command + * @op: The opcode + */ +static void fc_lport_flogi_fill(struct fc_lport *lport, + struct fc_els_flogi *flogi, + unsigned int op) +{ + struct fc_els_csp *sp; + struct fc_els_cssp *cp; + + memset(flogi, 0, sizeof(*flogi)); + flogi->fl_cmd = (u8) op; + put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn); + put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn); + sp = &flogi->fl_csp; + sp->sp_hi_ver = 0x20; + sp->sp_lo_ver = 0x20; + sp->sp_bb_cred = htons(10); /* this gets set by gateway */ + sp->sp_bb_data = htons((u16) lport->mfs); + cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */ + cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ); + if (op != ELS_FLOGI) { + sp->sp_features = htons(FC_SP_FT_CIRO); + sp->sp_tot_seq = htons(255); /* seq. we accept */ + sp->sp_rel_off = htons(0x1f); + sp->sp_e_d_tov = htonl(lport->e_d_tov); + + cp->cp_rdfs = htons((u16) lport->mfs); + cp->cp_con_seq = htons(255); + cp->cp_open_seq = 1; + } +} + +/** + * fc_lport_add_fc4_type() - Add a supported FC-4 type to a local port + * @lport: The local port to add a new FC-4 type to + * @type: The new FC-4 type + */ +static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type) +{ + __be32 *mp; + + mp = &lport->fcts.ff_type_map[type / FC_NS_BPW]; + *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW)); +} + +/** + * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report. + * @lport: Fibre Channel local port receiving the RLIR + * @fp: The RLIR request frame + * + * Locking Note: The lport lock is expected to be held before calling + * this function. + */ +static void fc_lport_recv_rlir_req(struct fc_lport *lport, struct fc_frame *fp) +{ + FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n", + fc_lport_state(lport)); + + lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); + fc_frame_free(fp); +} + +/** + * fc_lport_recv_echo_req() - Handle received ECHO request + * @lport: The local port receiving the ECHO + * @fp: ECHO request frame + * + * Locking Note: The lport lock is expected to be held before calling + * this function. + */ +static void fc_lport_recv_echo_req(struct fc_lport *lport, + struct fc_frame *in_fp) +{ + struct fc_frame *fp; + unsigned int len; + void *pp; + void *dp; + + FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n", + fc_lport_state(lport)); + + len = fr_len(in_fp) - sizeof(struct fc_frame_header); + pp = fc_frame_payload_get(in_fp, len); + + if (len < sizeof(__be32)) + len = sizeof(__be32); + + fp = fc_frame_alloc(lport, len); + if (fp) { + dp = fc_frame_payload_get(fp, len); + memcpy(dp, pp, len); + *((__be32 *)dp) = htonl(ELS_LS_ACC << 24); + fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + } + fc_frame_free(in_fp); +} + +/** + * fc_lport_recv_rnid_req() - Handle received Request Node ID data request + * @lport: The local port receiving the RNID + * @fp: The RNID request frame + * + * Locking Note: The lport lock is expected to be held before calling + * this function. + */ +static void fc_lport_recv_rnid_req(struct fc_lport *lport, + struct fc_frame *in_fp) +{ + struct fc_frame *fp; + struct fc_els_rnid *req; + struct { + struct fc_els_rnid_resp rnid; + struct fc_els_rnid_cid cid; + struct fc_els_rnid_gen gen; + } *rp; + struct fc_seq_els_data rjt_data; + u8 fmt; + size_t len; + + FC_LPORT_DBG(lport, "Received RNID request while in state %s\n", + fc_lport_state(lport)); + + req = fc_frame_payload_get(in_fp, sizeof(*req)); + if (!req) { + rjt_data.reason = ELS_RJT_LOGIC; + rjt_data.explan = ELS_EXPL_NONE; + lport->tt.seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data); + } else { + fmt = req->rnid_fmt; + len = sizeof(*rp); + if (fmt != ELS_RNIDF_GEN || + ntohl(lport->rnid_gen.rnid_atype) == 0) { + fmt = ELS_RNIDF_NONE; /* nothing to provide */ + len -= sizeof(rp->gen); + } + fp = fc_frame_alloc(lport, len); + if (fp) { + rp = fc_frame_payload_get(fp, len); + memset(rp, 0, len); + rp->rnid.rnid_cmd = ELS_LS_ACC; + rp->rnid.rnid_fmt = fmt; + rp->rnid.rnid_cid_len = sizeof(rp->cid); + rp->cid.rnid_wwpn = htonll(lport->wwpn); + rp->cid.rnid_wwnn = htonll(lport->wwnn); + if (fmt == ELS_RNIDF_GEN) { + rp->rnid.rnid_sid_len = sizeof(rp->gen); + memcpy(&rp->gen, &lport->rnid_gen, + sizeof(rp->gen)); + } + fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + } + } + fc_frame_free(in_fp); +} + +/** + * fc_lport_recv_logo_req() - Handle received fabric LOGO request + * @lport: The local port receiving the LOGO + * @fp: The LOGO request frame + * + * Locking Note: The lport lock is expected to be held before calling + * this function. + */ +static void fc_lport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp) +{ + lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); + fc_lport_enter_reset(lport); + fc_frame_free(fp); +} + +/** + * fc_fabric_login() - Start the lport state machine + * @lport: The local port that should log into the fabric + * + * Locking Note: This function should not be called + * with the lport lock held. + */ +int fc_fabric_login(struct fc_lport *lport) +{ + int rc = -1; + + mutex_lock(&lport->lp_mutex); + if (lport->state == LPORT_ST_DISABLED || + lport->state == LPORT_ST_LOGO) { + fc_lport_state_enter(lport, LPORT_ST_RESET); + fc_lport_enter_reset(lport); + rc = 0; + } + mutex_unlock(&lport->lp_mutex); + + return rc; +} +EXPORT_SYMBOL(fc_fabric_login); + +/** + * __fc_linkup() - Handler for transport linkup events + * @lport: The lport whose link is up + * + * Locking: must be called with the lp_mutex held + */ +void __fc_linkup(struct fc_lport *lport) +{ + if (!lport->link_up) { + lport->link_up = 1; + + if (lport->state == LPORT_ST_RESET) + fc_lport_enter_flogi(lport); + } +} + +/** + * fc_linkup() - Handler for transport linkup events + * @lport: The local port whose link is up + */ +void fc_linkup(struct fc_lport *lport) +{ + printk(KERN_INFO "host%d: libfc: Link up on port (%6.6x)\n", + lport->host->host_no, lport->port_id); + + mutex_lock(&lport->lp_mutex); + __fc_linkup(lport); + mutex_unlock(&lport->lp_mutex); +} +EXPORT_SYMBOL(fc_linkup); + +/** + * __fc_linkdown() - Handler for transport linkdown events + * @lport: The lport whose link is down + * + * Locking: must be called with the lp_mutex held + */ +void __fc_linkdown(struct fc_lport *lport) +{ + if (lport->link_up) { + lport->link_up = 0; + fc_lport_enter_reset(lport); + lport->tt.fcp_cleanup(lport); + } +} + +/** + * fc_linkdown() - Handler for transport linkdown events + * @lport: The local port whose link is down + */ +void fc_linkdown(struct fc_lport *lport) +{ + printk(KERN_INFO "host%d: libfc: Link down on port (%6.6x)\n", + lport->host->host_no, lport->port_id); + + mutex_lock(&lport->lp_mutex); + __fc_linkdown(lport); + mutex_unlock(&lport->lp_mutex); +} +EXPORT_SYMBOL(fc_linkdown); + +/** + * fc_fabric_logoff() - Logout of the fabric + * @lport: The local port to logoff the fabric + * + * Return value: + * 0 for success, -1 for failure + */ +int fc_fabric_logoff(struct fc_lport *lport) +{ + lport->tt.disc_stop_final(lport); + mutex_lock(&lport->lp_mutex); + if (lport->dns_rdata) + lport->tt.rport_logoff(lport->dns_rdata); + mutex_unlock(&lport->lp_mutex); + lport->tt.rport_flush_queue(); + mutex_lock(&lport->lp_mutex); + fc_lport_enter_logo(lport); + mutex_unlock(&lport->lp_mutex); + cancel_delayed_work_sync(&lport->retry_work); + return 0; +} +EXPORT_SYMBOL(fc_fabric_logoff); + +/** + * fc_lport_destroy() - Unregister a fc_lport + * @lport: The local port to unregister + * + * Note: + * exit routine for fc_lport instance + * clean-up all the allocated memory + * and free up other system resources. + * + */ +int fc_lport_destroy(struct fc_lport *lport) +{ + mutex_lock(&lport->lp_mutex); + lport->state = LPORT_ST_DISABLED; + lport->link_up = 0; + lport->tt.frame_send = fc_frame_drop; + mutex_unlock(&lport->lp_mutex); + + lport->tt.fcp_abort_io(lport); + lport->tt.disc_stop_final(lport); + lport->tt.exch_mgr_reset(lport, 0, 0); + cancel_delayed_work_sync(&lport->retry_work); + fc_fc4_del_lport(lport); + return 0; +} +EXPORT_SYMBOL(fc_lport_destroy); + +/** + * fc_set_mfs() - Set the maximum frame size for a local port + * @lport: The local port to set the MFS for + * @mfs: The new MFS + */ +int fc_set_mfs(struct fc_lport *lport, u32 mfs) +{ + unsigned int old_mfs; + int rc = -EINVAL; + + mutex_lock(&lport->lp_mutex); + + old_mfs = lport->mfs; + + if (mfs >= FC_MIN_MAX_FRAME) { + mfs &= ~3; + if (mfs > FC_MAX_FRAME) + mfs = FC_MAX_FRAME; + mfs -= sizeof(struct fc_frame_header); + lport->mfs = mfs; + rc = 0; + } + + if (!rc && mfs < old_mfs) + fc_lport_enter_reset(lport); + + mutex_unlock(&lport->lp_mutex); + + return rc; +} +EXPORT_SYMBOL(fc_set_mfs); + +/** + * fc_lport_disc_callback() - Callback for discovery events + * @lport: The local port receiving the event + * @event: The discovery event + */ +static void fc_lport_disc_callback(struct fc_lport *lport, + enum fc_disc_event event) +{ + switch (event) { + case DISC_EV_SUCCESS: + FC_LPORT_DBG(lport, "Discovery succeeded\n"); + break; + case DISC_EV_FAILED: + printk(KERN_ERR "host%d: libfc: " + "Discovery failed for port (%6.6x)\n", + lport->host->host_no, lport->port_id); + mutex_lock(&lport->lp_mutex); + fc_lport_enter_reset(lport); + mutex_unlock(&lport->lp_mutex); + break; + case DISC_EV_NONE: + WARN_ON(1); + break; + } +} + +/** + * fc_rport_enter_ready() - Enter the ready state and start discovery + * @lport: The local port that is ready + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_enter_ready(struct fc_lport *lport) +{ + FC_LPORT_DBG(lport, "Entered READY from state %s\n", + fc_lport_state(lport)); + + fc_lport_state_enter(lport, LPORT_ST_READY); + if (lport->vport) + fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE); + fc_vports_linkchange(lport); + + if (!lport->ptp_rdata) + lport->tt.disc_start(fc_lport_disc_callback, lport); +} + +/** + * fc_lport_set_port_id() - set the local port Port ID + * @lport: The local port which will have its Port ID set. + * @port_id: The new port ID. + * @fp: The frame containing the incoming request, or NULL. + * + * Locking Note: The lport lock is expected to be held before calling + * this function. + */ +static void fc_lport_set_port_id(struct fc_lport *lport, u32 port_id, + struct fc_frame *fp) +{ + if (port_id) + printk(KERN_INFO "host%d: Assigned Port ID %6.6x\n", + lport->host->host_no, port_id); + + lport->port_id = port_id; + + /* Update the fc_host */ + fc_host_port_id(lport->host) = port_id; + + if (lport->tt.lport_set_port_id) + lport->tt.lport_set_port_id(lport, port_id, fp); +} + +/** + * fc_lport_set_port_id() - set the local port Port ID for point-to-multipoint + * @lport: The local port which will have its Port ID set. + * @port_id: The new port ID. + * + * Called by the lower-level driver when transport sets the local port_id. + * This is used in VN_port to VN_port mode for FCoE, and causes FLOGI and + * discovery to be skipped. + */ +void fc_lport_set_local_id(struct fc_lport *lport, u32 port_id) +{ + mutex_lock(&lport->lp_mutex); + + fc_lport_set_port_id(lport, port_id, NULL); + + switch (lport->state) { + case LPORT_ST_RESET: + case LPORT_ST_FLOGI: + if (port_id) + fc_lport_enter_ready(lport); + break; + default: + break; + } + mutex_unlock(&lport->lp_mutex); +} +EXPORT_SYMBOL(fc_lport_set_local_id); + +/** + * fc_lport_recv_flogi_req() - Receive a FLOGI request + * @lport: The local port that received the request + * @rx_fp: The FLOGI frame + * + * A received FLOGI request indicates a point-to-point connection. + * Accept it with the common service parameters indicating our N port. + * Set up to do a PLOGI if we have the higher-number WWPN. + * + * Locking Note: The lport lock is expected to be held before calling + * this function. + */ +static void fc_lport_recv_flogi_req(struct fc_lport *lport, + struct fc_frame *rx_fp) +{ + struct fc_frame *fp; + struct fc_frame_header *fh; + struct fc_els_flogi *flp; + struct fc_els_flogi *new_flp; + u64 remote_wwpn; + u32 remote_fid; + u32 local_fid; + + FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n", + fc_lport_state(lport)); + + remote_fid = fc_frame_sid(rx_fp); + flp = fc_frame_payload_get(rx_fp, sizeof(*flp)); + if (!flp) + goto out; + remote_wwpn = get_unaligned_be64(&flp->fl_wwpn); + if (remote_wwpn == lport->wwpn) { + printk(KERN_WARNING "host%d: libfc: Received FLOGI from port " + "with same WWPN %16.16llx\n", + lport->host->host_no, remote_wwpn); + goto out; + } + FC_LPORT_DBG(lport, "FLOGI from port WWPN %16.16llx\n", remote_wwpn); + + /* + * XXX what is the right thing to do for FIDs? + * The originator might expect our S_ID to be 0xfffffe. + * But if so, both of us could end up with the same FID. + */ + local_fid = FC_LOCAL_PTP_FID_LO; + if (remote_wwpn < lport->wwpn) { + local_fid = FC_LOCAL_PTP_FID_HI; + if (!remote_fid || remote_fid == local_fid) + remote_fid = FC_LOCAL_PTP_FID_LO; + } else if (!remote_fid) { + remote_fid = FC_LOCAL_PTP_FID_HI; + } + + fc_lport_set_port_id(lport, local_fid, rx_fp); + + fp = fc_frame_alloc(lport, sizeof(*flp)); + if (fp) { + new_flp = fc_frame_payload_get(fp, sizeof(*flp)); + fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI); + new_flp->fl_cmd = (u8) ELS_LS_ACC; + + /* + * Send the response. If this fails, the originator should + * repeat the sequence. + */ + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + fh = fc_frame_header_get(fp); + hton24(fh->fh_s_id, local_fid); + hton24(fh->fh_d_id, remote_fid); + lport->tt.frame_send(lport, fp); + + } else { + fc_lport_error(lport, fp); + } + fc_lport_ptp_setup(lport, remote_fid, remote_wwpn, + get_unaligned_be64(&flp->fl_wwnn)); +out: + fc_frame_free(rx_fp); +} + +/** + * fc_lport_recv_els_req() - The generic lport ELS request handler + * @lport: The local port that received the request + * @fp: The request frame + * + * This function will see if the lport handles the request or + * if an rport should handle the request. + * + * Locking Note: This function should not be called with the lport + * lock held because it will grab the lock. + */ +static void fc_lport_recv_els_req(struct fc_lport *lport, + struct fc_frame *fp) +{ + void (*recv)(struct fc_lport *, struct fc_frame *); + + mutex_lock(&lport->lp_mutex); + + /* + * Handle special ELS cases like FLOGI, LOGO, and + * RSCN here. These don't require a session. + * Even if we had a session, it might not be ready. + */ + if (!lport->link_up) + fc_frame_free(fp); + else { + /* + * Check opcode. + */ + recv = lport->tt.rport_recv_req; + switch (fc_frame_payload_op(fp)) { + case ELS_FLOGI: + if (!lport->point_to_multipoint) + recv = fc_lport_recv_flogi_req; + break; + case ELS_LOGO: + if (fc_frame_sid(fp) == FC_FID_FLOGI) + recv = fc_lport_recv_logo_req; + break; + case ELS_RSCN: + recv = lport->tt.disc_recv_req; + break; + case ELS_ECHO: + recv = fc_lport_recv_echo_req; + break; + case ELS_RLIR: + recv = fc_lport_recv_rlir_req; + break; + case ELS_RNID: + recv = fc_lport_recv_rnid_req; + break; + } + + recv(lport, fp); + } + mutex_unlock(&lport->lp_mutex); +} + +static int fc_lport_els_prli(struct fc_rport_priv *rdata, u32 spp_len, + const struct fc_els_spp *spp_in, + struct fc_els_spp *spp_out) +{ + return FC_SPP_RESP_INVL; +} + +struct fc4_prov fc_lport_els_prov = { + .prli = fc_lport_els_prli, + .recv = fc_lport_recv_els_req, +}; + +/** + * fc_lport_recv_req() - The generic lport request handler + * @lport: The lport that received the request + * @fp: The frame the request is in + * + * Locking Note: This function should not be called with the lport + * lock held because it may grab the lock. + */ +static void fc_lport_recv_req(struct fc_lport *lport, + struct fc_frame *fp) +{ + struct fc_frame_header *fh = fc_frame_header_get(fp); + struct fc_seq *sp = fr_seq(fp); + struct fc4_prov *prov; + + /* + * Use RCU read lock and module_lock to be sure module doesn't + * deregister and get unloaded while we're calling it. + * try_module_get() is inlined and accepts a NULL parameter. + * Only ELSes and FCP target ops should come through here. + * The locking is unfortunate, and a better scheme is being sought. + */ + + rcu_read_lock(); + if (fh->fh_type >= FC_FC4_PROV_SIZE) + goto drop; + prov = rcu_dereference(fc_passive_prov[fh->fh_type]); + if (!prov || !try_module_get(prov->module)) + goto drop; + rcu_read_unlock(); + prov->recv(lport, fp); + module_put(prov->module); + return; +drop: + rcu_read_unlock(); + FC_LPORT_DBG(lport, "dropping unexpected frame type %x\n", fh->fh_type); + fc_frame_free(fp); + if (sp) + lport->tt.exch_done(sp); +} + +/** + * fc_lport_reset() - Reset a local port + * @lport: The local port which should be reset + * + * Locking Note: This functions should not be called with the + * lport lock held. + */ +int fc_lport_reset(struct fc_lport *lport) +{ + cancel_delayed_work_sync(&lport->retry_work); + mutex_lock(&lport->lp_mutex); + fc_lport_enter_reset(lport); + mutex_unlock(&lport->lp_mutex); + return 0; +} +EXPORT_SYMBOL(fc_lport_reset); + +/** + * fc_lport_reset_locked() - Reset the local port w/ the lport lock held + * @lport: The local port to be reset + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_reset_locked(struct fc_lport *lport) +{ + if (lport->dns_rdata) + lport->tt.rport_logoff(lport->dns_rdata); + + if (lport->ptp_rdata) { + lport->tt.rport_logoff(lport->ptp_rdata); + kref_put(&lport->ptp_rdata->kref, lport->tt.rport_destroy); + lport->ptp_rdata = NULL; + } + + lport->tt.disc_stop(lport); + + lport->tt.exch_mgr_reset(lport, 0, 0); + fc_host_fabric_name(lport->host) = 0; + + if (lport->port_id && (!lport->point_to_multipoint || !lport->link_up)) + fc_lport_set_port_id(lport, 0, NULL); +} + +/** + * fc_lport_enter_reset() - Reset the local port + * @lport: The local port to be reset + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_enter_reset(struct fc_lport *lport) +{ + FC_LPORT_DBG(lport, "Entered RESET state from %s state\n", + fc_lport_state(lport)); + + if (lport->state == LPORT_ST_DISABLED || lport->state == LPORT_ST_LOGO) + return; + + if (lport->vport) { + if (lport->link_up) + fc_vport_set_state(lport->vport, FC_VPORT_INITIALIZING); + else + fc_vport_set_state(lport->vport, FC_VPORT_LINKDOWN); + } + fc_lport_state_enter(lport, LPORT_ST_RESET); + fc_host_post_event(lport->host, fc_get_event_number(), + FCH_EVT_LIPRESET, 0); + fc_vports_linkchange(lport); + fc_lport_reset_locked(lport); + if (lport->link_up) + fc_lport_enter_flogi(lport); +} + +/** + * fc_lport_enter_disabled() - Disable the local port + * @lport: The local port to be reset + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_enter_disabled(struct fc_lport *lport) +{ + FC_LPORT_DBG(lport, "Entered disabled state from %s state\n", + fc_lport_state(lport)); + + fc_lport_state_enter(lport, LPORT_ST_DISABLED); + fc_vports_linkchange(lport); + fc_lport_reset_locked(lport); +} + +/** + * fc_lport_error() - Handler for any errors + * @lport: The local port that the error was on + * @fp: The error code encoded in a frame pointer + * + * If the error was caused by a resource allocation failure + * then wait for half a second and retry, otherwise retry + * after the e_d_tov time. + */ +static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp) +{ + unsigned long delay = 0; + FC_LPORT_DBG(lport, "Error %ld in state %s, retries %d\n", + IS_ERR(fp) ? -PTR_ERR(fp) : 0, fc_lport_state(lport), + lport->retry_count); + + if (PTR_ERR(fp) == -FC_EX_CLOSED) + return; + + /* + * Memory allocation failure, or the exchange timed out + * or we received LS_RJT. + * Retry after delay + */ + if (lport->retry_count < lport->max_retry_count) { + lport->retry_count++; + if (!fp) + delay = msecs_to_jiffies(500); + else + delay = msecs_to_jiffies(lport->e_d_tov); + + schedule_delayed_work(&lport->retry_work, delay); + } else + fc_lport_enter_reset(lport); +} + +/** + * fc_lport_ns_resp() - Handle response to a name server + * registration exchange + * @sp: current sequence in exchange + * @fp: response frame + * @lp_arg: Fibre Channel host port instance + * + * Locking Note: This function will be called without the lport lock + * held, but it will lock, call an _enter_* function or fc_lport_error() + * and then unlock the lport. + */ +static void fc_lport_ns_resp(struct fc_seq *sp, struct fc_frame *fp, + void *lp_arg) +{ + struct fc_lport *lport = lp_arg; + struct fc_frame_header *fh; + struct fc_ct_hdr *ct; + + FC_LPORT_DBG(lport, "Received a ns %s\n", fc_els_resp_type(fp)); + + if (fp == ERR_PTR(-FC_EX_CLOSED)) + return; + + mutex_lock(&lport->lp_mutex); + + if (lport->state < LPORT_ST_RNN_ID || lport->state > LPORT_ST_RFF_ID) { + FC_LPORT_DBG(lport, "Received a name server response, " + "but in state %s\n", fc_lport_state(lport)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_lport_error(lport, fp); + goto err; + } + + fh = fc_frame_header_get(fp); + ct = fc_frame_payload_get(fp, sizeof(*ct)); + + if (fh && ct && fh->fh_type == FC_TYPE_CT && + ct->ct_fs_type == FC_FST_DIR && + ct->ct_fs_subtype == FC_NS_SUBTYPE && + ntohs(ct->ct_cmd) == FC_FS_ACC) + switch (lport->state) { + case LPORT_ST_RNN_ID: + fc_lport_enter_ns(lport, LPORT_ST_RSNN_NN); + break; + case LPORT_ST_RSNN_NN: + fc_lport_enter_ns(lport, LPORT_ST_RSPN_ID); + break; + case LPORT_ST_RSPN_ID: + fc_lport_enter_ns(lport, LPORT_ST_RFT_ID); + break; + case LPORT_ST_RFT_ID: + fc_lport_enter_ns(lport, LPORT_ST_RFF_ID); + break; + case LPORT_ST_RFF_ID: + if (lport->fdmi_enabled) + fc_lport_enter_fdmi(lport); + else + fc_lport_enter_scr(lport); + break; + default: + /* should have already been caught by state checks */ + break; + } + else + fc_lport_error(lport, fp); +out: + fc_frame_free(fp); +err: + mutex_unlock(&lport->lp_mutex); +} + +/** + * fc_lport_ms_resp() - Handle response to a management server + * exchange + * @sp: current sequence in exchange + * @fp: response frame + * @lp_arg: Fibre Channel host port instance + * + * Locking Note: This function will be called without the lport lock + * held, but it will lock, call an _enter_* function or fc_lport_error() + * and then unlock the lport. + */ +static void fc_lport_ms_resp(struct fc_seq *sp, struct fc_frame *fp, + void *lp_arg) +{ + struct fc_lport *lport = lp_arg; + struct fc_frame_header *fh; + struct fc_ct_hdr *ct; + + FC_LPORT_DBG(lport, "Received a ms %s\n", fc_els_resp_type(fp)); + + if (fp == ERR_PTR(-FC_EX_CLOSED)) + return; + + mutex_lock(&lport->lp_mutex); + + if (lport->state < LPORT_ST_RHBA || lport->state > LPORT_ST_DPRT) { + FC_LPORT_DBG(lport, "Received a management server response, " + "but in state %s\n", fc_lport_state(lport)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_lport_error(lport, fp); + goto err; + } + + fh = fc_frame_header_get(fp); + ct = fc_frame_payload_get(fp, sizeof(*ct)); + + if (fh && ct && fh->fh_type == FC_TYPE_CT && + ct->ct_fs_type == FC_FST_MGMT && + ct->ct_fs_subtype == FC_FDMI_SUBTYPE) { + FC_LPORT_DBG(lport, "Received a management server response, " + "reason=%d explain=%d\n", + ct->ct_reason, + ct->ct_explan); + + switch (lport->state) { + case LPORT_ST_RHBA: + if (ntohs(ct->ct_cmd) == FC_FS_ACC) + fc_lport_enter_ms(lport, LPORT_ST_RPA); + else /* Error Skip RPA */ + fc_lport_enter_scr(lport); + break; + case LPORT_ST_RPA: + fc_lport_enter_scr(lport); + break; + case LPORT_ST_DPRT: + fc_lport_enter_ms(lport, LPORT_ST_RHBA); + break; + case LPORT_ST_DHBA: + fc_lport_enter_ms(lport, LPORT_ST_DPRT); + break; + default: + /* should have already been caught by state checks */ + break; + } + } else { + /* Invalid Frame? */ + fc_lport_error(lport, fp); + } +out: + fc_frame_free(fp); +err: + mutex_unlock(&lport->lp_mutex); +} + +/** + * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request + * @sp: current sequence in SCR exchange + * @fp: response frame + * @lp_arg: Fibre Channel lport port instance that sent the registration request + * + * Locking Note: This function will be called without the lport lock + * held, but it will lock, call an _enter_* function or fc_lport_error + * and then unlock the lport. + */ +static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp, + void *lp_arg) +{ + struct fc_lport *lport = lp_arg; + u8 op; + + FC_LPORT_DBG(lport, "Received a SCR %s\n", fc_els_resp_type(fp)); + + if (fp == ERR_PTR(-FC_EX_CLOSED)) + return; + + mutex_lock(&lport->lp_mutex); + + if (lport->state != LPORT_ST_SCR) { + FC_LPORT_DBG(lport, "Received a SCR response, but in state " + "%s\n", fc_lport_state(lport)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_lport_error(lport, fp); + goto err; + } + + op = fc_frame_payload_op(fp); + if (op == ELS_LS_ACC) + fc_lport_enter_ready(lport); + else + fc_lport_error(lport, fp); + +out: + fc_frame_free(fp); +err: + mutex_unlock(&lport->lp_mutex); +} + +/** + * fc_lport_enter_scr() - Send a SCR (State Change Register) request + * @lport: The local port to register for state changes + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_enter_scr(struct fc_lport *lport) +{ + struct fc_frame *fp; + + FC_LPORT_DBG(lport, "Entered SCR state from %s state\n", + fc_lport_state(lport)); + + fc_lport_state_enter(lport, LPORT_ST_SCR); + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr)); + if (!fp) { + fc_lport_error(lport, fp); + return; + } + + if (!lport->tt.elsct_send(lport, FC_FID_FCTRL, fp, ELS_SCR, + fc_lport_scr_resp, lport, + 2 * lport->r_a_tov)) + fc_lport_error(lport, NULL); +} + +/** + * fc_lport_enter_ns() - register some object with the name server + * @lport: Fibre Channel local port to register + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_enter_ns(struct fc_lport *lport, enum fc_lport_state state) +{ + struct fc_frame *fp; + enum fc_ns_req cmd; + int size = sizeof(struct fc_ct_hdr); + size_t len; + + FC_LPORT_DBG(lport, "Entered %s state from %s state\n", + fc_lport_state_names[state], + fc_lport_state(lport)); + + fc_lport_state_enter(lport, state); + + switch (state) { + case LPORT_ST_RNN_ID: + cmd = FC_NS_RNN_ID; + size += sizeof(struct fc_ns_rn_id); + break; + case LPORT_ST_RSNN_NN: + len = strnlen(fc_host_symbolic_name(lport->host), 255); + /* if there is no symbolic name, skip to RFT_ID */ + if (!len) + return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID); + cmd = FC_NS_RSNN_NN; + size += sizeof(struct fc_ns_rsnn) + len; + break; + case LPORT_ST_RSPN_ID: + len = strnlen(fc_host_symbolic_name(lport->host), 255); + /* if there is no symbolic name, skip to RFT_ID */ + if (!len) + return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID); + cmd = FC_NS_RSPN_ID; + size += sizeof(struct fc_ns_rspn) + len; + break; + case LPORT_ST_RFT_ID: + cmd = FC_NS_RFT_ID; + size += sizeof(struct fc_ns_rft); + break; + case LPORT_ST_RFF_ID: + cmd = FC_NS_RFF_ID; + size += sizeof(struct fc_ns_rff_id); + break; + default: + fc_lport_error(lport, NULL); + return; + } + + fp = fc_frame_alloc(lport, size); + if (!fp) { + fc_lport_error(lport, fp); + return; + } + + if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, cmd, + fc_lport_ns_resp, + lport, 3 * lport->r_a_tov)) + fc_lport_error(lport, fp); +} + +static struct fc_rport_operations fc_lport_rport_ops = { + .event_callback = fc_lport_rport_callback, +}; + +/** + * fc_rport_enter_dns() - Create a fc_rport for the name server + * @lport: The local port requesting a remote port for the name server + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_enter_dns(struct fc_lport *lport) +{ + struct fc_rport_priv *rdata; + + FC_LPORT_DBG(lport, "Entered DNS state from %s state\n", + fc_lport_state(lport)); + + fc_lport_state_enter(lport, LPORT_ST_DNS); + + mutex_lock(&lport->disc.disc_mutex); + rdata = lport->tt.rport_create(lport, FC_FID_DIR_SERV); + mutex_unlock(&lport->disc.disc_mutex); + if (!rdata) + goto err; + + rdata->ops = &fc_lport_rport_ops; + lport->tt.rport_login(rdata); + return; + +err: + fc_lport_error(lport, NULL); +} + +/** + * fc_lport_enter_ms() - management server commands + * @lport: Fibre Channel local port to register + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_enter_ms(struct fc_lport *lport, enum fc_lport_state state) +{ + struct fc_frame *fp; + enum fc_fdmi_req cmd; + int size = sizeof(struct fc_ct_hdr); + size_t len; + int numattrs; + + FC_LPORT_DBG(lport, "Entered %s state from %s state\n", + fc_lport_state_names[state], + fc_lport_state(lport)); + + fc_lport_state_enter(lport, state); + + switch (state) { + case LPORT_ST_RHBA: + cmd = FC_FDMI_RHBA; + /* Number of HBA Attributes */ + numattrs = 10; + len = sizeof(struct fc_fdmi_rhba); + len -= sizeof(struct fc_fdmi_attr_entry); + len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN); + len += FC_FDMI_HBA_ATTR_NODENAME_LEN; + len += FC_FDMI_HBA_ATTR_MANUFACTURER_LEN; + len += FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN; + len += FC_FDMI_HBA_ATTR_MODEL_LEN; + len += FC_FDMI_HBA_ATTR_MODELDESCR_LEN; + len += FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN; + len += FC_FDMI_HBA_ATTR_DRIVERVERSION_LEN; + len += FC_FDMI_HBA_ATTR_OPTIONROMVERSION_LEN; + len += FC_FDMI_HBA_ATTR_FIRMWAREVERSION_LEN; + len += FC_FDMI_HBA_ATTR_OSNAMEVERSION_LEN; + + size += len; + break; + case LPORT_ST_RPA: + cmd = FC_FDMI_RPA; + /* Number of Port Attributes */ + numattrs = 6; + len = sizeof(struct fc_fdmi_rpa); + len -= sizeof(struct fc_fdmi_attr_entry); + len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN); + len += FC_FDMI_PORT_ATTR_FC4TYPES_LEN; + len += FC_FDMI_PORT_ATTR_SUPPORTEDSPEED_LEN; + len += FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN; + len += FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN; + len += FC_FDMI_PORT_ATTR_OSDEVICENAME_LEN; + len += FC_FDMI_PORT_ATTR_HOSTNAME_LEN; + + size += len; + break; + case LPORT_ST_DPRT: + cmd = FC_FDMI_DPRT; + len = sizeof(struct fc_fdmi_dprt); + size += len; + break; + case LPORT_ST_DHBA: + cmd = FC_FDMI_DHBA; + len = sizeof(struct fc_fdmi_dhba); + size += len; + break; + default: + fc_lport_error(lport, NULL); + return; + } + + FC_LPORT_DBG(lport, "Cmd=0x%x Len %d size %d\n", + cmd, (int)len, size); + fp = fc_frame_alloc(lport, size); + if (!fp) { + fc_lport_error(lport, fp); + return; + } + + if (!lport->tt.elsct_send(lport, FC_FID_MGMT_SERV, fp, cmd, + fc_lport_ms_resp, + lport, 3 * lport->r_a_tov)) + fc_lport_error(lport, fp); +} + +/** + * fc_rport_enter_fdmi() - Create a fc_rport for the management server + * @lport: The local port requesting a remote port for the management server + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_enter_fdmi(struct fc_lport *lport) +{ + struct fc_rport_priv *rdata; + + FC_LPORT_DBG(lport, "Entered FDMI state from %s state\n", + fc_lport_state(lport)); + + fc_lport_state_enter(lport, LPORT_ST_FDMI); + + mutex_lock(&lport->disc.disc_mutex); + rdata = lport->tt.rport_create(lport, FC_FID_MGMT_SERV); + mutex_unlock(&lport->disc.disc_mutex); + if (!rdata) + goto err; + + rdata->ops = &fc_lport_rport_ops; + lport->tt.rport_login(rdata); + return; + +err: + fc_lport_error(lport, NULL); +} + +/** + * fc_lport_timeout() - Handler for the retry_work timer + * @work: The work struct of the local port + */ +static void fc_lport_timeout(struct work_struct *work) +{ + struct fc_lport *lport = + container_of(work, struct fc_lport, + retry_work.work); + + mutex_lock(&lport->lp_mutex); + + switch (lport->state) { + case LPORT_ST_DISABLED: + break; + case LPORT_ST_READY: + break; + case LPORT_ST_RESET: + break; + case LPORT_ST_FLOGI: + fc_lport_enter_flogi(lport); + break; + case LPORT_ST_DNS: + fc_lport_enter_dns(lport); + break; + case LPORT_ST_RNN_ID: + case LPORT_ST_RSNN_NN: + case LPORT_ST_RSPN_ID: + case LPORT_ST_RFT_ID: + case LPORT_ST_RFF_ID: + fc_lport_enter_ns(lport, lport->state); + break; + case LPORT_ST_FDMI: + fc_lport_enter_fdmi(lport); + break; + case LPORT_ST_RHBA: + case LPORT_ST_RPA: + case LPORT_ST_DHBA: + case LPORT_ST_DPRT: + FC_LPORT_DBG(lport, "Skipping lport state %s to SCR\n", + fc_lport_state(lport)); + /* fall thru */ + case LPORT_ST_SCR: + fc_lport_enter_scr(lport); + break; + case LPORT_ST_LOGO: + fc_lport_enter_logo(lport); + break; + } + + mutex_unlock(&lport->lp_mutex); +} + +/** + * fc_lport_logo_resp() - Handle response to LOGO request + * @sp: The sequence that the LOGO was on + * @fp: The LOGO frame + * @lp_arg: The lport port that received the LOGO request + * + * Locking Note: This function will be called without the lport lock + * held, but it will lock, call an _enter_* function or fc_lport_error() + * and then unlock the lport. + */ +void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, + void *lp_arg) +{ + struct fc_lport *lport = lp_arg; + u8 op; + + FC_LPORT_DBG(lport, "Received a LOGO %s\n", fc_els_resp_type(fp)); + + if (fp == ERR_PTR(-FC_EX_CLOSED)) + return; + + mutex_lock(&lport->lp_mutex); + + if (lport->state != LPORT_ST_LOGO) { + FC_LPORT_DBG(lport, "Received a LOGO response, but in state " + "%s\n", fc_lport_state(lport)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_lport_error(lport, fp); + goto err; + } + + op = fc_frame_payload_op(fp); + if (op == ELS_LS_ACC) + fc_lport_enter_disabled(lport); + else + fc_lport_error(lport, fp); + +out: + fc_frame_free(fp); +err: + mutex_unlock(&lport->lp_mutex); +} +EXPORT_SYMBOL(fc_lport_logo_resp); + +/** + * fc_rport_enter_logo() - Logout of the fabric + * @lport: The local port to be logged out + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_enter_logo(struct fc_lport *lport) +{ + struct fc_frame *fp; + struct fc_els_logo *logo; + + FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n", + fc_lport_state(lport)); + + fc_lport_state_enter(lport, LPORT_ST_LOGO); + fc_vports_linkchange(lport); + + fp = fc_frame_alloc(lport, sizeof(*logo)); + if (!fp) { + fc_lport_error(lport, fp); + return; + } + + if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_LOGO, + fc_lport_logo_resp, lport, + 2 * lport->r_a_tov)) + fc_lport_error(lport, NULL); +} + +/** + * fc_lport_flogi_resp() - Handle response to FLOGI request + * @sp: The sequence that the FLOGI was on + * @fp: The FLOGI response frame + * @lp_arg: The lport port that received the FLOGI response + * + * Locking Note: This function will be called without the lport lock + * held, but it will lock, call an _enter_* function or fc_lport_error() + * and then unlock the lport. + */ +void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, + void *lp_arg) +{ + struct fc_lport *lport = lp_arg; + struct fc_frame_header *fh; + struct fc_els_flogi *flp; + u32 did; + u16 csp_flags; + unsigned int r_a_tov; + unsigned int e_d_tov; + u16 mfs; + + FC_LPORT_DBG(lport, "Received a FLOGI %s\n", fc_els_resp_type(fp)); + + if (fp == ERR_PTR(-FC_EX_CLOSED)) + return; + + mutex_lock(&lport->lp_mutex); + + if (lport->state != LPORT_ST_FLOGI) { + FC_LPORT_DBG(lport, "Received a FLOGI response, but in state " + "%s\n", fc_lport_state(lport)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_lport_error(lport, fp); + goto err; + } + + fh = fc_frame_header_get(fp); + did = fc_frame_did(fp); + if (fh->fh_r_ctl != FC_RCTL_ELS_REP || did == 0 || + fc_frame_payload_op(fp) != ELS_LS_ACC) { + FC_LPORT_DBG(lport, "FLOGI not accepted or bad response\n"); + fc_lport_error(lport, fp); + goto err; + } + + flp = fc_frame_payload_get(fp, sizeof(*flp)); + if (!flp) { + FC_LPORT_DBG(lport, "FLOGI bad response\n"); + fc_lport_error(lport, fp); + goto err; + } + + mfs = ntohs(flp->fl_csp.sp_bb_data) & + FC_SP_BB_DATA_MASK; + + if (mfs < FC_SP_MIN_MAX_PAYLOAD || mfs > FC_SP_MAX_MAX_PAYLOAD) { + FC_LPORT_DBG(lport, "FLOGI bad mfs:%hu response, " + "lport->mfs:%hu\n", mfs, lport->mfs); + fc_lport_error(lport, fp); + goto err; + } + + if (mfs <= lport->mfs) { + lport->mfs = mfs; + fc_host_maxframe_size(lport->host) = mfs; + } + + csp_flags = ntohs(flp->fl_csp.sp_features); + r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov); + e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov); + if (csp_flags & FC_SP_FT_EDTR) + e_d_tov /= 1000000; + + lport->npiv_enabled = !!(csp_flags & FC_SP_FT_NPIV_ACC); + + if ((csp_flags & FC_SP_FT_FPORT) == 0) { + if (e_d_tov > lport->e_d_tov) + lport->e_d_tov = e_d_tov; + lport->r_a_tov = 2 * e_d_tov; + fc_lport_set_port_id(lport, did, fp); + printk(KERN_INFO "host%d: libfc: " + "Port (%6.6x) entered " + "point-to-point mode\n", + lport->host->host_no, did); + fc_lport_ptp_setup(lport, fc_frame_sid(fp), + get_unaligned_be64( + &flp->fl_wwpn), + get_unaligned_be64( + &flp->fl_wwnn)); + } else { + lport->e_d_tov = e_d_tov; + lport->r_a_tov = r_a_tov; + fc_host_fabric_name(lport->host) = + get_unaligned_be64(&flp->fl_wwnn); + fc_lport_set_port_id(lport, did, fp); + fc_lport_enter_dns(lport); + } + +out: + fc_frame_free(fp); +err: + mutex_unlock(&lport->lp_mutex); +} +EXPORT_SYMBOL(fc_lport_flogi_resp); + +/** + * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager + * @lport: Fibre Channel local port to be logged in to the fabric + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static void fc_lport_enter_flogi(struct fc_lport *lport) +{ + struct fc_frame *fp; + + FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n", + fc_lport_state(lport)); + + fc_lport_state_enter(lport, LPORT_ST_FLOGI); + + if (lport->point_to_multipoint) { + if (lport->port_id) + fc_lport_enter_ready(lport); + return; + } + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); + if (!fp) + return fc_lport_error(lport, fp); + + if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, + lport->vport ? ELS_FDISC : ELS_FLOGI, + fc_lport_flogi_resp, lport, + lport->vport ? 2 * lport->r_a_tov : + lport->e_d_tov)) + fc_lport_error(lport, NULL); +} + +/** + * fc_lport_config() - Configure a fc_lport + * @lport: The local port to be configured + */ +int fc_lport_config(struct fc_lport *lport) +{ + INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout); + mutex_init(&lport->lp_mutex); + + fc_lport_state_enter(lport, LPORT_ST_DISABLED); + + fc_lport_add_fc4_type(lport, FC_TYPE_FCP); + fc_lport_add_fc4_type(lport, FC_TYPE_CT); + fc_fc4_conf_lport_params(lport, FC_TYPE_FCP); + + return 0; +} +EXPORT_SYMBOL(fc_lport_config); + +/** + * fc_lport_init() - Initialize the lport layer for a local port + * @lport: The local port to initialize the exchange layer for + */ +int fc_lport_init(struct fc_lport *lport) +{ + if (!lport->tt.lport_recv) + lport->tt.lport_recv = fc_lport_recv_req; + + if (!lport->tt.lport_reset) + lport->tt.lport_reset = fc_lport_reset; + + fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT; + fc_host_node_name(lport->host) = lport->wwnn; + fc_host_port_name(lport->host) = lport->wwpn; + fc_host_supported_classes(lport->host) = FC_COS_CLASS3; + memset(fc_host_supported_fc4s(lport->host), 0, + sizeof(fc_host_supported_fc4s(lport->host))); + fc_host_supported_fc4s(lport->host)[2] = 1; + fc_host_supported_fc4s(lport->host)[7] = 1; + + /* This value is also unchanging */ + memset(fc_host_active_fc4s(lport->host), 0, + sizeof(fc_host_active_fc4s(lport->host))); + fc_host_active_fc4s(lport->host)[2] = 1; + fc_host_active_fc4s(lport->host)[7] = 1; + fc_host_maxframe_size(lport->host) = lport->mfs; + fc_host_supported_speeds(lport->host) = 0; + if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT) + fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT; + if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT) + fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT; + fc_fc4_add_lport(lport); + + return 0; +} +EXPORT_SYMBOL(fc_lport_init); + +/** + * fc_lport_bsg_resp() - The common response handler for FC Passthrough requests + * @sp: The sequence for the FC Passthrough response + * @fp: The response frame + * @info_arg: The BSG info that the response is for + */ +static void fc_lport_bsg_resp(struct fc_seq *sp, struct fc_frame *fp, + void *info_arg) +{ + struct fc_bsg_info *info = info_arg; + struct fc_bsg_job *job = info->job; + struct fc_lport *lport = info->lport; + struct fc_frame_header *fh; + size_t len; + void *buf; + + if (IS_ERR(fp)) { + job->reply->result = (PTR_ERR(fp) == -FC_EX_CLOSED) ? + -ECONNABORTED : -ETIMEDOUT; + job->reply_len = sizeof(uint32_t); + job->state_flags |= FC_RQST_STATE_DONE; + job->job_done(job); + kfree(info); + return; + } + + mutex_lock(&lport->lp_mutex); + fh = fc_frame_header_get(fp); + len = fr_len(fp) - sizeof(*fh); + buf = fc_frame_payload_get(fp, 0); + + if (fr_sof(fp) == FC_SOF_I3 && !ntohs(fh->fh_seq_cnt)) { + /* Get the response code from the first frame payload */ + unsigned short cmd = (info->rsp_code == FC_FS_ACC) ? + ntohs(((struct fc_ct_hdr *)buf)->ct_cmd) : + (unsigned short)fc_frame_payload_op(fp); + + /* Save the reply status of the job */ + job->reply->reply_data.ctels_reply.status = + (cmd == info->rsp_code) ? + FC_CTELS_STATUS_OK : FC_CTELS_STATUS_REJECT; + } + + job->reply->reply_payload_rcv_len += + fc_copy_buffer_to_sglist(buf, len, info->sg, &info->nents, + &info->offset, NULL); + + if (fr_eof(fp) == FC_EOF_T && + (ntoh24(fh->fh_f_ctl) & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == + (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { + if (job->reply->reply_payload_rcv_len > + job->reply_payload.payload_len) + job->reply->reply_payload_rcv_len = + job->reply_payload.payload_len; + job->reply->result = 0; + job->state_flags |= FC_RQST_STATE_DONE; + job->job_done(job); + kfree(info); + } + fc_frame_free(fp); + mutex_unlock(&lport->lp_mutex); +} + +/** + * fc_lport_els_request() - Send ELS passthrough request + * @job: The BSG Passthrough job + * @lport: The local port sending the request + * @did: The destination port id + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static int fc_lport_els_request(struct fc_bsg_job *job, + struct fc_lport *lport, + u32 did, u32 tov) +{ + struct fc_bsg_info *info; + struct fc_frame *fp; + struct fc_frame_header *fh; + char *pp; + int len; + + fp = fc_frame_alloc(lport, job->request_payload.payload_len); + if (!fp) + return -ENOMEM; + + len = job->request_payload.payload_len; + pp = fc_frame_payload_get(fp, len); + + sg_copy_to_buffer(job->request_payload.sg_list, + job->request_payload.sg_cnt, + pp, len); + + fh = fc_frame_header_get(fp); + fh->fh_r_ctl = FC_RCTL_ELS_REQ; + hton24(fh->fh_d_id, did); + hton24(fh->fh_s_id, lport->port_id); + fh->fh_type = FC_TYPE_ELS; + hton24(fh->fh_f_ctl, FC_FCTL_REQ); + fh->fh_cs_ctl = 0; + fh->fh_df_ctl = 0; + fh->fh_parm_offset = 0; + + info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL); + if (!info) { + fc_frame_free(fp); + return -ENOMEM; + } + + info->job = job; + info->lport = lport; + info->rsp_code = ELS_LS_ACC; + info->nents = job->reply_payload.sg_cnt; + info->sg = job->reply_payload.sg_list; + + if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp, + NULL, info, tov)) { + kfree(info); + return -ECOMM; + } + return 0; +} + +/** + * fc_lport_ct_request() - Send CT Passthrough request + * @job: The BSG Passthrough job + * @lport: The local port sending the request + * @did: The destination FC-ID + * @tov: The timeout period to wait for the response + * + * Locking Note: The lport lock is expected to be held before calling + * this routine. + */ +static int fc_lport_ct_request(struct fc_bsg_job *job, + struct fc_lport *lport, u32 did, u32 tov) +{ + struct fc_bsg_info *info; + struct fc_frame *fp; + struct fc_frame_header *fh; + struct fc_ct_req *ct; + size_t len; + + fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + + job->request_payload.payload_len); + if (!fp) + return -ENOMEM; + + len = job->request_payload.payload_len; + ct = fc_frame_payload_get(fp, len); + + sg_copy_to_buffer(job->request_payload.sg_list, + job->request_payload.sg_cnt, + ct, len); + + fh = fc_frame_header_get(fp); + fh->fh_r_ctl = FC_RCTL_DD_UNSOL_CTL; + hton24(fh->fh_d_id, did); + hton24(fh->fh_s_id, lport->port_id); + fh->fh_type = FC_TYPE_CT; + hton24(fh->fh_f_ctl, FC_FCTL_REQ); + fh->fh_cs_ctl = 0; + fh->fh_df_ctl = 0; + fh->fh_parm_offset = 0; + + info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL); + if (!info) { + fc_frame_free(fp); + return -ENOMEM; + } + + info->job = job; + info->lport = lport; + info->rsp_code = FC_FS_ACC; + info->nents = job->reply_payload.sg_cnt; + info->sg = job->reply_payload.sg_list; + + if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp, + NULL, info, tov)) { + kfree(info); + return -ECOMM; + } + return 0; +} + +/** + * fc_lport_bsg_request() - The common entry point for sending + * FC Passthrough requests + * @job: The BSG passthrough job + */ +int fc_lport_bsg_request(struct fc_bsg_job *job) +{ + struct request *rsp = job->req->next_rq; + struct Scsi_Host *shost = job->shost; + struct fc_lport *lport = shost_priv(shost); + struct fc_rport *rport; + struct fc_rport_priv *rdata; + int rc = -EINVAL; + u32 did; + + job->reply->reply_payload_rcv_len = 0; + if (rsp) + rsp->resid_len = job->reply_payload.payload_len; + + mutex_lock(&lport->lp_mutex); + + switch (job->request->msgcode) { + case FC_BSG_RPT_ELS: + rport = job->rport; + if (!rport) + break; + + rdata = rport->dd_data; + rc = fc_lport_els_request(job, lport, rport->port_id, + rdata->e_d_tov); + break; + + case FC_BSG_RPT_CT: + rport = job->rport; + if (!rport) + break; + + rdata = rport->dd_data; + rc = fc_lport_ct_request(job, lport, rport->port_id, + rdata->e_d_tov); + break; + + case FC_BSG_HST_CT: + did = ntoh24(job->request->rqst_data.h_ct.port_id); + if (did == FC_FID_DIR_SERV) + rdata = lport->dns_rdata; + else + rdata = lport->tt.rport_lookup(lport, did); + + if (!rdata) + break; + + rc = fc_lport_ct_request(job, lport, did, rdata->e_d_tov); + break; + + case FC_BSG_HST_ELS_NOLOGIN: + did = ntoh24(job->request->rqst_data.h_els.port_id); + rc = fc_lport_els_request(job, lport, did, lport->e_d_tov); + break; + } + + mutex_unlock(&lport->lp_mutex); + return rc; +} +EXPORT_SYMBOL(fc_lport_bsg_request); diff --git a/kernel/drivers/scsi/libfc/fc_npiv.c b/kernel/drivers/scsi/libfc/fc_npiv.c new file mode 100644 index 000000000..9fbf78ed8 --- /dev/null +++ b/kernel/drivers/scsi/libfc/fc_npiv.c @@ -0,0 +1,159 @@ +/* + * Copyright(c) 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +/* + * NPIV VN_Port helper functions for libfc + */ + +#include <scsi/libfc.h> +#include <linux/export.h> + +/** + * fc_vport_create() - Create a new NPIV vport instance + * @vport: fc_vport structure from scsi_transport_fc + * @privsize: driver private data size to allocate along with the Scsi_Host + */ + +struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize) +{ + struct Scsi_Host *shost = vport_to_shost(vport); + struct fc_lport *n_port = shost_priv(shost); + struct fc_lport *vn_port; + + vn_port = libfc_host_alloc(shost->hostt, privsize); + if (!vn_port) + return vn_port; + + vn_port->vport = vport; + vport->dd_data = vn_port; + + mutex_lock(&n_port->lp_mutex); + list_add_tail(&vn_port->list, &n_port->vports); + mutex_unlock(&n_port->lp_mutex); + + return vn_port; +} +EXPORT_SYMBOL(libfc_vport_create); + +/** + * fc_vport_id_lookup() - find NPIV lport that matches a given fabric ID + * @n_port: Top level N_Port which may have multiple NPIV VN_Ports + * @port_id: Fabric ID to find a match for + * + * Returns: matching lport pointer or NULL if there is no match + */ +struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id) +{ + struct fc_lport *lport = NULL; + struct fc_lport *vn_port; + + if (n_port->port_id == port_id) + return n_port; + + if (port_id == FC_FID_FLOGI) + return n_port; /* for point-to-point */ + + mutex_lock(&n_port->lp_mutex); + list_for_each_entry(vn_port, &n_port->vports, list) { + if (vn_port->port_id == port_id) { + lport = vn_port; + break; + } + } + mutex_unlock(&n_port->lp_mutex); + + return lport; +} +EXPORT_SYMBOL(fc_vport_id_lookup); + +/* + * When setting the link state of vports during an lport state change, it's + * necessary to hold the lp_mutex of both the N_Port and the VN_Port. + * This tells the lockdep engine to treat the nested locking of the VN_Port + * as a different lock class. + */ +enum libfc_lport_mutex_class { + LPORT_MUTEX_NORMAL = 0, + LPORT_MUTEX_VN_PORT = 1, +}; + +/** + * __fc_vport_setlink() - update link and status on a VN_Port + * @n_port: parent N_Port + * @vn_port: VN_Port to update + * + * Locking: must be called with both the N_Port and VN_Port lp_mutex held + */ +static void __fc_vport_setlink(struct fc_lport *n_port, + struct fc_lport *vn_port) +{ + struct fc_vport *vport = vn_port->vport; + + if (vn_port->state == LPORT_ST_DISABLED) + return; + + if (n_port->state == LPORT_ST_READY) { + if (n_port->npiv_enabled) { + fc_vport_set_state(vport, FC_VPORT_INITIALIZING); + __fc_linkup(vn_port); + } else { + fc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP); + __fc_linkdown(vn_port); + } + } else { + fc_vport_set_state(vport, FC_VPORT_LINKDOWN); + __fc_linkdown(vn_port); + } +} + +/** + * fc_vport_setlink() - update link and status on a VN_Port + * @vn_port: virtual port to update + */ +void fc_vport_setlink(struct fc_lport *vn_port) +{ + struct fc_vport *vport = vn_port->vport; + struct Scsi_Host *shost = vport_to_shost(vport); + struct fc_lport *n_port = shost_priv(shost); + + mutex_lock(&n_port->lp_mutex); + mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT); + __fc_vport_setlink(n_port, vn_port); + mutex_unlock(&vn_port->lp_mutex); + mutex_unlock(&n_port->lp_mutex); +} +EXPORT_SYMBOL(fc_vport_setlink); + +/** + * fc_vports_linkchange() - change the link state of all vports + * @n_port: Parent N_Port that has changed state + * + * Locking: called with the n_port lp_mutex held + */ +void fc_vports_linkchange(struct fc_lport *n_port) +{ + struct fc_lport *vn_port; + + list_for_each_entry(vn_port, &n_port->vports, list) { + mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT); + __fc_vport_setlink(n_port, vn_port); + mutex_unlock(&vn_port->lp_mutex); + } +} + diff --git a/kernel/drivers/scsi/libfc/fc_rport.c b/kernel/drivers/scsi/libfc/fc_rport.c new file mode 100644 index 000000000..589ff9aed --- /dev/null +++ b/kernel/drivers/scsi/libfc/fc_rport.c @@ -0,0 +1,2069 @@ +/* + * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +/* + * RPORT GENERAL INFO + * + * This file contains all processing regarding fc_rports. It contains the + * rport state machine and does all rport interaction with the transport class. + * There should be no other places in libfc that interact directly with the + * transport class in regards to adding and deleting rports. + * + * fc_rport's represent N_Port's within the fabric. + */ + +/* + * RPORT LOCKING + * + * The rport should never hold the rport mutex and then attempt to acquire + * either the lport or disc mutexes. The rport's mutex is considered lesser + * than both the lport's mutex and the disc mutex. Refer to fc_lport.c for + * more comments on the hierarchy. + * + * The locking strategy is similar to the lport's strategy. The lock protects + * the rport's states and is held and released by the entry points to the rport + * block. All _enter_* functions correspond to rport states and expect the rport + * mutex to be locked before calling them. This means that rports only handle + * one request or response at a time, since they're not critical for the I/O + * path this potential over-use of the mutex is acceptable. + */ + +#include <linux/kernel.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/rcupdate.h> +#include <linux/timer.h> +#include <linux/workqueue.h> +#include <linux/export.h> +#include <asm/unaligned.h> + +#include <scsi/libfc.h> +#include <scsi/fc_encode.h> + +#include "fc_libfc.h" + +static struct workqueue_struct *rport_event_queue; + +static void fc_rport_enter_flogi(struct fc_rport_priv *); +static void fc_rport_enter_plogi(struct fc_rport_priv *); +static void fc_rport_enter_prli(struct fc_rport_priv *); +static void fc_rport_enter_rtv(struct fc_rport_priv *); +static void fc_rport_enter_ready(struct fc_rport_priv *); +static void fc_rport_enter_logo(struct fc_rport_priv *); +static void fc_rport_enter_adisc(struct fc_rport_priv *); + +static void fc_rport_recv_plogi_req(struct fc_lport *, struct fc_frame *); +static void fc_rport_recv_prli_req(struct fc_rport_priv *, struct fc_frame *); +static void fc_rport_recv_prlo_req(struct fc_rport_priv *, struct fc_frame *); +static void fc_rport_recv_logo_req(struct fc_lport *, struct fc_frame *); +static void fc_rport_timeout(struct work_struct *); +static void fc_rport_error(struct fc_rport_priv *, struct fc_frame *); +static void fc_rport_error_retry(struct fc_rport_priv *, struct fc_frame *); +static void fc_rport_work(struct work_struct *); + +static const char *fc_rport_state_names[] = { + [RPORT_ST_INIT] = "Init", + [RPORT_ST_FLOGI] = "FLOGI", + [RPORT_ST_PLOGI_WAIT] = "PLOGI_WAIT", + [RPORT_ST_PLOGI] = "PLOGI", + [RPORT_ST_PRLI] = "PRLI", + [RPORT_ST_RTV] = "RTV", + [RPORT_ST_READY] = "Ready", + [RPORT_ST_ADISC] = "ADISC", + [RPORT_ST_DELETE] = "Delete", +}; + +/** + * fc_rport_lookup() - Lookup a remote port by port_id + * @lport: The local port to lookup the remote port on + * @port_id: The remote port ID to look up + * + * The caller must hold either disc_mutex or rcu_read_lock(). + */ +static struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport, + u32 port_id) +{ + struct fc_rport_priv *rdata; + + list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) + if (rdata->ids.port_id == port_id) + return rdata; + return NULL; +} + +/** + * fc_rport_create() - Create a new remote port + * @lport: The local port this remote port will be associated with + * @ids: The identifiers for the new remote port + * + * The remote port will start in the INIT state. + * + * Locking note: must be called with the disc_mutex held. + */ +static struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, + u32 port_id) +{ + struct fc_rport_priv *rdata; + + rdata = lport->tt.rport_lookup(lport, port_id); + if (rdata) + return rdata; + + rdata = kzalloc(sizeof(*rdata) + lport->rport_priv_size, GFP_KERNEL); + if (!rdata) + return NULL; + + rdata->ids.node_name = -1; + rdata->ids.port_name = -1; + rdata->ids.port_id = port_id; + rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; + + kref_init(&rdata->kref); + mutex_init(&rdata->rp_mutex); + rdata->local_port = lport; + rdata->rp_state = RPORT_ST_INIT; + rdata->event = RPORT_EV_NONE; + rdata->flags = FC_RP_FLAGS_REC_SUPPORTED; + rdata->e_d_tov = lport->e_d_tov; + rdata->r_a_tov = lport->r_a_tov; + rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; + INIT_DELAYED_WORK(&rdata->retry_work, fc_rport_timeout); + INIT_WORK(&rdata->event_work, fc_rport_work); + if (port_id != FC_FID_DIR_SERV) { + rdata->lld_event_callback = lport->tt.rport_event_callback; + list_add_rcu(&rdata->peers, &lport->disc.rports); + } + return rdata; +} + +/** + * fc_rport_destroy() - Free a remote port after last reference is released + * @kref: The remote port's kref + */ +static void fc_rport_destroy(struct kref *kref) +{ + struct fc_rport_priv *rdata; + + rdata = container_of(kref, struct fc_rport_priv, kref); + kfree_rcu(rdata, rcu); +} + +/** + * fc_rport_state() - Return a string identifying the remote port's state + * @rdata: The remote port + */ +static const char *fc_rport_state(struct fc_rport_priv *rdata) +{ + const char *cp; + + cp = fc_rport_state_names[rdata->rp_state]; + if (!cp) + cp = "Unknown"; + return cp; +} + +/** + * fc_set_rport_loss_tmo() - Set the remote port loss timeout + * @rport: The remote port that gets a new timeout value + * @timeout: The new timeout value (in seconds) + */ +void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout) +{ + if (timeout) + rport->dev_loss_tmo = timeout; + else + rport->dev_loss_tmo = 1; +} +EXPORT_SYMBOL(fc_set_rport_loss_tmo); + +/** + * fc_plogi_get_maxframe() - Get the maximum payload from the common service + * parameters in a FLOGI frame + * @flp: The FLOGI or PLOGI payload + * @maxval: The maximum frame size upper limit; this may be less than what + * is in the service parameters + */ +static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp, + unsigned int maxval) +{ + unsigned int mfs; + + /* + * Get max payload from the common service parameters and the + * class 3 receive data field size. + */ + mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK; + if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) + maxval = mfs; + mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs); + if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval) + maxval = mfs; + return maxval; +} + +/** + * fc_rport_state_enter() - Change the state of a remote port + * @rdata: The remote port whose state should change + * @new: The new state + * + * Locking Note: Called with the rport lock held + */ +static void fc_rport_state_enter(struct fc_rport_priv *rdata, + enum fc_rport_state new) +{ + if (rdata->rp_state != new) + rdata->retries = 0; + rdata->rp_state = new; +} + +/** + * fc_rport_work() - Handler for remote port events in the rport_event_queue + * @work: Handle to the remote port being dequeued + */ +static void fc_rport_work(struct work_struct *work) +{ + u32 port_id; + struct fc_rport_priv *rdata = + container_of(work, struct fc_rport_priv, event_work); + struct fc_rport_libfc_priv *rpriv; + enum fc_rport_event event; + struct fc_lport *lport = rdata->local_port; + struct fc_rport_operations *rport_ops; + struct fc_rport_identifiers ids; + struct fc_rport *rport; + struct fc4_prov *prov; + u8 type; + + mutex_lock(&rdata->rp_mutex); + event = rdata->event; + rport_ops = rdata->ops; + rport = rdata->rport; + + FC_RPORT_DBG(rdata, "work event %u\n", event); + + switch (event) { + case RPORT_EV_READY: + ids = rdata->ids; + rdata->event = RPORT_EV_NONE; + rdata->major_retries = 0; + kref_get(&rdata->kref); + mutex_unlock(&rdata->rp_mutex); + + if (!rport) + rport = fc_remote_port_add(lport->host, 0, &ids); + if (!rport) { + FC_RPORT_DBG(rdata, "Failed to add the rport\n"); + lport->tt.rport_logoff(rdata); + kref_put(&rdata->kref, lport->tt.rport_destroy); + return; + } + mutex_lock(&rdata->rp_mutex); + if (rdata->rport) + FC_RPORT_DBG(rdata, "rport already allocated\n"); + rdata->rport = rport; + rport->maxframe_size = rdata->maxframe_size; + rport->supported_classes = rdata->supported_classes; + + rpriv = rport->dd_data; + rpriv->local_port = lport; + rpriv->rp_state = rdata->rp_state; + rpriv->flags = rdata->flags; + rpriv->e_d_tov = rdata->e_d_tov; + rpriv->r_a_tov = rdata->r_a_tov; + mutex_unlock(&rdata->rp_mutex); + + if (rport_ops && rport_ops->event_callback) { + FC_RPORT_DBG(rdata, "callback ev %d\n", event); + rport_ops->event_callback(lport, rdata, event); + } + if (rdata->lld_event_callback) { + FC_RPORT_DBG(rdata, "lld callback ev %d\n", event); + rdata->lld_event_callback(lport, rdata, event); + } + kref_put(&rdata->kref, lport->tt.rport_destroy); + break; + + case RPORT_EV_FAILED: + case RPORT_EV_LOGO: + case RPORT_EV_STOP: + if (rdata->prli_count) { + mutex_lock(&fc_prov_mutex); + for (type = 1; type < FC_FC4_PROV_SIZE; type++) { + prov = fc_passive_prov[type]; + if (prov && prov->prlo) + prov->prlo(rdata); + } + mutex_unlock(&fc_prov_mutex); + } + port_id = rdata->ids.port_id; + mutex_unlock(&rdata->rp_mutex); + + if (rport_ops && rport_ops->event_callback) { + FC_RPORT_DBG(rdata, "callback ev %d\n", event); + rport_ops->event_callback(lport, rdata, event); + } + if (rdata->lld_event_callback) { + FC_RPORT_DBG(rdata, "lld callback ev %d\n", event); + rdata->lld_event_callback(lport, rdata, event); + } + cancel_delayed_work_sync(&rdata->retry_work); + + /* + * Reset any outstanding exchanges before freeing rport. + */ + lport->tt.exch_mgr_reset(lport, 0, port_id); + lport->tt.exch_mgr_reset(lport, port_id, 0); + + if (rport) { + rpriv = rport->dd_data; + rpriv->rp_state = RPORT_ST_DELETE; + mutex_lock(&rdata->rp_mutex); + rdata->rport = NULL; + mutex_unlock(&rdata->rp_mutex); + fc_remote_port_delete(rport); + } + + mutex_lock(&lport->disc.disc_mutex); + mutex_lock(&rdata->rp_mutex); + if (rdata->rp_state == RPORT_ST_DELETE) { + if (port_id == FC_FID_DIR_SERV) { + rdata->event = RPORT_EV_NONE; + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, lport->tt.rport_destroy); + } else if ((rdata->flags & FC_RP_STARTED) && + rdata->major_retries < + lport->max_rport_retry_count) { + rdata->major_retries++; + rdata->event = RPORT_EV_NONE; + FC_RPORT_DBG(rdata, "work restart\n"); + fc_rport_enter_flogi(rdata); + mutex_unlock(&rdata->rp_mutex); + } else { + FC_RPORT_DBG(rdata, "work delete\n"); + list_del_rcu(&rdata->peers); + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, lport->tt.rport_destroy); + } + } else { + /* + * Re-open for events. Reissue READY event if ready. + */ + rdata->event = RPORT_EV_NONE; + if (rdata->rp_state == RPORT_ST_READY) + fc_rport_enter_ready(rdata); + mutex_unlock(&rdata->rp_mutex); + } + mutex_unlock(&lport->disc.disc_mutex); + break; + + default: + mutex_unlock(&rdata->rp_mutex); + break; + } +} + +/** + * fc_rport_login() - Start the remote port login state machine + * @rdata: The remote port to be logged in to + * + * Locking Note: Called without the rport lock held. This + * function will hold the rport lock, call an _enter_* + * function and then unlock the rport. + * + * This indicates the intent to be logged into the remote port. + * If it appears we are already logged in, ADISC is used to verify + * the setup. + */ +static int fc_rport_login(struct fc_rport_priv *rdata) +{ + mutex_lock(&rdata->rp_mutex); + + rdata->flags |= FC_RP_STARTED; + switch (rdata->rp_state) { + case RPORT_ST_READY: + FC_RPORT_DBG(rdata, "ADISC port\n"); + fc_rport_enter_adisc(rdata); + break; + case RPORT_ST_DELETE: + FC_RPORT_DBG(rdata, "Restart deleted port\n"); + break; + default: + FC_RPORT_DBG(rdata, "Login to port\n"); + fc_rport_enter_flogi(rdata); + break; + } + mutex_unlock(&rdata->rp_mutex); + + return 0; +} + +/** + * fc_rport_enter_delete() - Schedule a remote port to be deleted + * @rdata: The remote port to be deleted + * @event: The event to report as the reason for deletion + * + * Locking Note: Called with the rport lock held. + * + * Allow state change into DELETE only once. + * + * Call queue_work only if there's no event already pending. + * Set the new event so that the old pending event will not occur. + * Since we have the mutex, even if fc_rport_work() is already started, + * it'll see the new event. + */ +static void fc_rport_enter_delete(struct fc_rport_priv *rdata, + enum fc_rport_event event) +{ + if (rdata->rp_state == RPORT_ST_DELETE) + return; + + FC_RPORT_DBG(rdata, "Delete port\n"); + + fc_rport_state_enter(rdata, RPORT_ST_DELETE); + + if (rdata->event == RPORT_EV_NONE) + queue_work(rport_event_queue, &rdata->event_work); + rdata->event = event; +} + +/** + * fc_rport_logoff() - Logoff and remove a remote port + * @rdata: The remote port to be logged off of + * + * Locking Note: Called without the rport lock held. This + * function will hold the rport lock, call an _enter_* + * function and then unlock the rport. + */ +static int fc_rport_logoff(struct fc_rport_priv *rdata) +{ + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Remove port\n"); + + rdata->flags &= ~FC_RP_STARTED; + if (rdata->rp_state == RPORT_ST_DELETE) { + FC_RPORT_DBG(rdata, "Port in Delete state, not removing\n"); + goto out; + } + fc_rport_enter_logo(rdata); + + /* + * Change the state to Delete so that we discard + * the response. + */ + fc_rport_enter_delete(rdata, RPORT_EV_STOP); +out: + mutex_unlock(&rdata->rp_mutex); + return 0; +} + +/** + * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state + * @rdata: The remote port that is ready + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_ready(struct fc_rport_priv *rdata) +{ + fc_rport_state_enter(rdata, RPORT_ST_READY); + + FC_RPORT_DBG(rdata, "Port is Ready\n"); + + if (rdata->event == RPORT_EV_NONE) + queue_work(rport_event_queue, &rdata->event_work); + rdata->event = RPORT_EV_READY; +} + +/** + * fc_rport_timeout() - Handler for the retry_work timer + * @work: Handle to the remote port that has timed out + * + * Locking Note: Called without the rport lock held. This + * function will hold the rport lock, call an _enter_* + * function and then unlock the rport. + */ +static void fc_rport_timeout(struct work_struct *work) +{ + struct fc_rport_priv *rdata = + container_of(work, struct fc_rport_priv, retry_work.work); + + mutex_lock(&rdata->rp_mutex); + + switch (rdata->rp_state) { + case RPORT_ST_FLOGI: + fc_rport_enter_flogi(rdata); + break; + case RPORT_ST_PLOGI: + fc_rport_enter_plogi(rdata); + break; + case RPORT_ST_PRLI: + fc_rport_enter_prli(rdata); + break; + case RPORT_ST_RTV: + fc_rport_enter_rtv(rdata); + break; + case RPORT_ST_ADISC: + fc_rport_enter_adisc(rdata); + break; + case RPORT_ST_PLOGI_WAIT: + case RPORT_ST_READY: + case RPORT_ST_INIT: + case RPORT_ST_DELETE: + break; + } + + mutex_unlock(&rdata->rp_mutex); +} + +/** + * fc_rport_error() - Error handler, called once retries have been exhausted + * @rdata: The remote port the error is happened on + * @fp: The error code encapsulated in a frame pointer + * + * Locking Note: The rport lock is expected to be held before + * calling this routine + */ +static void fc_rport_error(struct fc_rport_priv *rdata, struct fc_frame *fp) +{ + FC_RPORT_DBG(rdata, "Error %ld in state %s, retries %d\n", + IS_ERR(fp) ? -PTR_ERR(fp) : 0, + fc_rport_state(rdata), rdata->retries); + + switch (rdata->rp_state) { + case RPORT_ST_FLOGI: + case RPORT_ST_PLOGI: + rdata->flags &= ~FC_RP_STARTED; + fc_rport_enter_delete(rdata, RPORT_EV_FAILED); + break; + case RPORT_ST_RTV: + fc_rport_enter_ready(rdata); + break; + case RPORT_ST_PRLI: + case RPORT_ST_ADISC: + fc_rport_enter_logo(rdata); + break; + case RPORT_ST_PLOGI_WAIT: + case RPORT_ST_DELETE: + case RPORT_ST_READY: + case RPORT_ST_INIT: + break; + } +} + +/** + * fc_rport_error_retry() - Handler for remote port state retries + * @rdata: The remote port whose state is to be retried + * @fp: The error code encapsulated in a frame pointer + * + * If the error was an exchange timeout retry immediately, + * otherwise wait for E_D_TOV. + * + * Locking Note: The rport lock is expected to be held before + * calling this routine + */ +static void fc_rport_error_retry(struct fc_rport_priv *rdata, + struct fc_frame *fp) +{ + unsigned long delay = msecs_to_jiffies(FC_DEF_E_D_TOV); + + /* make sure this isn't an FC_EX_CLOSED error, never retry those */ + if (PTR_ERR(fp) == -FC_EX_CLOSED) + goto out; + + if (rdata->retries < rdata->local_port->max_rport_retry_count) { + FC_RPORT_DBG(rdata, "Error %ld in state %s, retrying\n", + PTR_ERR(fp), fc_rport_state(rdata)); + rdata->retries++; + /* no additional delay on exchange timeouts */ + if (PTR_ERR(fp) == -FC_EX_TIMEOUT) + delay = 0; + schedule_delayed_work(&rdata->retry_work, delay); + return; + } + +out: + fc_rport_error(rdata, fp); +} + +/** + * fc_rport_login_complete() - Handle parameters and completion of p-mp login. + * @rdata: The remote port which we logged into or which logged into us. + * @fp: The FLOGI or PLOGI request or response frame + * + * Returns non-zero error if a problem is detected with the frame. + * Does not free the frame. + * + * This is only used in point-to-multipoint mode for FIP currently. + */ +static int fc_rport_login_complete(struct fc_rport_priv *rdata, + struct fc_frame *fp) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_els_flogi *flogi; + unsigned int e_d_tov; + u16 csp_flags; + + flogi = fc_frame_payload_get(fp, sizeof(*flogi)); + if (!flogi) + return -EINVAL; + + csp_flags = ntohs(flogi->fl_csp.sp_features); + + if (fc_frame_payload_op(fp) == ELS_FLOGI) { + if (csp_flags & FC_SP_FT_FPORT) { + FC_RPORT_DBG(rdata, "Fabric bit set in FLOGI\n"); + return -EINVAL; + } + } else { + + /* + * E_D_TOV is not valid on an incoming FLOGI request. + */ + e_d_tov = ntohl(flogi->fl_csp.sp_e_d_tov); + if (csp_flags & FC_SP_FT_EDTR) + e_d_tov /= 1000000; + if (e_d_tov > rdata->e_d_tov) + rdata->e_d_tov = e_d_tov; + } + rdata->maxframe_size = fc_plogi_get_maxframe(flogi, lport->mfs); + return 0; +} + +/** + * fc_rport_flogi_resp() - Handle response to FLOGI request for p-mp mode + * @sp: The sequence that the FLOGI was on + * @fp: The FLOGI response frame + * @rp_arg: The remote port that received the FLOGI response + */ +static void fc_rport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rp_arg) +{ + struct fc_rport_priv *rdata = rp_arg; + struct fc_lport *lport = rdata->local_port; + struct fc_els_flogi *flogi; + unsigned int r_a_tov; + + FC_RPORT_DBG(rdata, "Received a FLOGI %s\n", fc_els_resp_type(fp)); + + if (fp == ERR_PTR(-FC_EX_CLOSED)) + goto put; + + mutex_lock(&rdata->rp_mutex); + + if (rdata->rp_state != RPORT_ST_FLOGI) { + FC_RPORT_DBG(rdata, "Received a FLOGI response, but in state " + "%s\n", fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error(rdata, fp); + goto err; + } + + if (fc_frame_payload_op(fp) != ELS_LS_ACC) + goto bad; + if (fc_rport_login_complete(rdata, fp)) + goto bad; + + flogi = fc_frame_payload_get(fp, sizeof(*flogi)); + if (!flogi) + goto bad; + r_a_tov = ntohl(flogi->fl_csp.sp_r_a_tov); + if (r_a_tov > rdata->r_a_tov) + rdata->r_a_tov = r_a_tov; + + if (rdata->ids.port_name < lport->wwpn) + fc_rport_enter_plogi(rdata); + else + fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); +put: + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); + return; +bad: + FC_RPORT_DBG(rdata, "Bad FLOGI response\n"); + fc_rport_error_retry(rdata, fp); + goto out; +} + +/** + * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp + * @rdata: The remote port to send a FLOGI to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_flogi(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + + if (!lport->point_to_multipoint) + return fc_rport_enter_plogi(rdata); + + FC_RPORT_DBG(rdata, "Entered FLOGI state from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_FLOGI); + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); + if (!fp) + return fc_rport_error_retry(rdata, fp); + + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_FLOGI, + fc_rport_flogi_resp, rdata, + 2 * lport->r_a_tov)) + fc_rport_error_retry(rdata, NULL); + else + kref_get(&rdata->kref); +} + +/** + * fc_rport_recv_flogi_req() - Handle Fabric Login (FLOGI) request in p-mp mode + * @lport: The local port that received the PLOGI request + * @rx_fp: The PLOGI request frame + */ +static void fc_rport_recv_flogi_req(struct fc_lport *lport, + struct fc_frame *rx_fp) +{ + struct fc_disc *disc; + struct fc_els_flogi *flp; + struct fc_rport_priv *rdata; + struct fc_frame *fp = rx_fp; + struct fc_seq_els_data rjt_data; + u32 sid; + + sid = fc_frame_sid(fp); + + FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n"); + + disc = &lport->disc; + mutex_lock(&disc->disc_mutex); + + if (!lport->point_to_multipoint) { + rjt_data.reason = ELS_RJT_UNSUP; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + + flp = fc_frame_payload_get(fp, sizeof(*flp)); + if (!flp) { + rjt_data.reason = ELS_RJT_LOGIC; + rjt_data.explan = ELS_EXPL_INV_LEN; + goto reject; + } + + rdata = lport->tt.rport_lookup(lport, sid); + if (!rdata) { + rjt_data.reason = ELS_RJT_FIP; + rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; + goto reject; + } + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received FLOGI in %s state\n", + fc_rport_state(rdata)); + + switch (rdata->rp_state) { + case RPORT_ST_INIT: + /* + * If received the FLOGI request on RPORT which is INIT state + * (means not transition to FLOGI either fc_rport timeout + * function didn;t trigger or this end hasn;t received + * beacon yet from other end. In that case only, allow RPORT + * state machine to continue, otherwise fall through which + * causes the code to send reject response. + * NOTE; Not checking for FIP->state such as VNMP_UP or + * VNMP_CLAIM because if FIP state is not one of those, + * RPORT wouldn;t have created and 'rport_lookup' would have + * failed anyway in that case. + */ + if (lport->point_to_multipoint) + break; + case RPORT_ST_DELETE: + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_FIP; + rjt_data.explan = ELS_EXPL_NOT_NEIGHBOR; + goto reject; + case RPORT_ST_FLOGI: + case RPORT_ST_PLOGI_WAIT: + case RPORT_ST_PLOGI: + break; + case RPORT_ST_PRLI: + case RPORT_ST_RTV: + case RPORT_ST_READY: + case RPORT_ST_ADISC: + /* + * Set the remote port to be deleted and to then restart. + * This queues work to be sure exchanges are reset. + */ + fc_rport_enter_delete(rdata, RPORT_EV_LOGO); + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_BUSY; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + if (fc_rport_login_complete(rdata, fp)) { + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_LOGIC; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + + fp = fc_frame_alloc(lport, sizeof(*flp)); + if (!fp) + goto out; + + fc_flogi_fill(lport, fp); + flp = fc_frame_payload_get(fp, sizeof(*flp)); + flp->fl_cmd = ELS_LS_ACC; + + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + + if (rdata->ids.port_name < lport->wwpn) + fc_rport_enter_plogi(rdata); + else + fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); +out: + mutex_unlock(&rdata->rp_mutex); + mutex_unlock(&disc->disc_mutex); + fc_frame_free(rx_fp); + return; + +reject: + mutex_unlock(&disc->disc_mutex); + lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); + fc_frame_free(rx_fp); +} + +/** + * fc_rport_plogi_resp() - Handler for ELS PLOGI responses + * @sp: The sequence the PLOGI is on + * @fp: The PLOGI response frame + * @rdata_arg: The remote port that sent the PLOGI response + * + * Locking Note: This function will be called without the rport lock + * held, but it will lock, call an _enter_* function or fc_rport_error + * and then unlock the rport. + */ +static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + struct fc_lport *lport = rdata->local_port; + struct fc_els_flogi *plp = NULL; + u16 csp_seq; + u16 cssp_seq; + u8 op; + + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received a PLOGI %s\n", fc_els_resp_type(fp)); + + if (rdata->rp_state != RPORT_ST_PLOGI) { + FC_RPORT_DBG(rdata, "Received a PLOGI response, but in state " + "%s\n", fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error_retry(rdata, fp); + goto err; + } + + op = fc_frame_payload_op(fp); + if (op == ELS_LS_ACC && + (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) { + rdata->ids.port_name = get_unaligned_be64(&plp->fl_wwpn); + rdata->ids.node_name = get_unaligned_be64(&plp->fl_wwnn); + + /* save plogi response sp_features for further reference */ + rdata->sp_features = ntohs(plp->fl_csp.sp_features); + + if (lport->point_to_multipoint) + fc_rport_login_complete(rdata, fp); + csp_seq = ntohs(plp->fl_csp.sp_tot_seq); + cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq); + if (cssp_seq < csp_seq) + csp_seq = cssp_seq; + rdata->max_seq = csp_seq; + rdata->maxframe_size = fc_plogi_get_maxframe(plp, lport->mfs); + fc_rport_enter_prli(rdata); + } else + fc_rport_error_retry(rdata, fp); + +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); +} + +static bool +fc_rport_compatible_roles(struct fc_lport *lport, struct fc_rport_priv *rdata) +{ + if (rdata->ids.roles == FC_PORT_ROLE_UNKNOWN) + return true; + if ((rdata->ids.roles & FC_PORT_ROLE_FCP_TARGET) && + (lport->service_params & FCP_SPPF_INIT_FCN)) + return true; + if ((rdata->ids.roles & FC_PORT_ROLE_FCP_INITIATOR) && + (lport->service_params & FCP_SPPF_TARG_FCN)) + return true; + return false; +} + +/** + * fc_rport_enter_plogi() - Send Port Login (PLOGI) request + * @rdata: The remote port to send a PLOGI to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + + if (!fc_rport_compatible_roles(lport, rdata)) { + FC_RPORT_DBG(rdata, "PLOGI suppressed for incompatible role\n"); + fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); + return; + } + + FC_RPORT_DBG(rdata, "Port entered PLOGI state from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_PLOGI); + + rdata->maxframe_size = FC_MIN_MAX_PAYLOAD; + fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi)); + if (!fp) { + FC_RPORT_DBG(rdata, "%s frame alloc failed\n", __func__); + fc_rport_error_retry(rdata, fp); + return; + } + rdata->e_d_tov = lport->e_d_tov; + + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_PLOGI, + fc_rport_plogi_resp, rdata, + 2 * lport->r_a_tov)) + fc_rport_error_retry(rdata, NULL); + else + kref_get(&rdata->kref); +} + +/** + * fc_rport_prli_resp() - Process Login (PRLI) response handler + * @sp: The sequence the PRLI response was on + * @fp: The PRLI response frame + * @rdata_arg: The remote port that sent the PRLI response + * + * Locking Note: This function will be called without the rport lock + * held, but it will lock, call an _enter_* function or fc_rport_error + * and then unlock the rport. + */ +static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + struct { + struct fc_els_prli prli; + struct fc_els_spp spp; + } *pp; + struct fc_els_spp temp_spp; + struct fc4_prov *prov; + u32 roles = FC_RPORT_ROLE_UNKNOWN; + u32 fcp_parm = 0; + u8 op; + u8 resp_code = 0; + + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received a PRLI %s\n", fc_els_resp_type(fp)); + + if (rdata->rp_state != RPORT_ST_PRLI) { + FC_RPORT_DBG(rdata, "Received a PRLI response, but in state " + "%s\n", fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error_retry(rdata, fp); + goto err; + } + + /* reinitialize remote port roles */ + rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; + + op = fc_frame_payload_op(fp); + if (op == ELS_LS_ACC) { + pp = fc_frame_payload_get(fp, sizeof(*pp)); + if (!pp) + goto out; + + resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK); + FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x\n", + pp->spp.spp_flags); + rdata->spp_type = pp->spp.spp_type; + if (resp_code != FC_SPP_RESP_ACK) { + if (resp_code == FC_SPP_RESP_CONF) + fc_rport_error(rdata, fp); + else + fc_rport_error_retry(rdata, fp); + goto out; + } + if (pp->prli.prli_spp_len < sizeof(pp->spp)) + goto out; + + fcp_parm = ntohl(pp->spp.spp_params); + if (fcp_parm & FCP_SPPF_RETRY) + rdata->flags |= FC_RP_FLAGS_RETRY; + if (fcp_parm & FCP_SPPF_CONF_COMPL) + rdata->flags |= FC_RP_FLAGS_CONF_REQ; + + prov = fc_passive_prov[FC_TYPE_FCP]; + if (prov) { + memset(&temp_spp, 0, sizeof(temp_spp)); + prov->prli(rdata, pp->prli.prli_spp_len, + &pp->spp, &temp_spp); + } + + rdata->supported_classes = FC_COS_CLASS3; + if (fcp_parm & FCP_SPPF_INIT_FCN) + roles |= FC_RPORT_ROLE_FCP_INITIATOR; + if (fcp_parm & FCP_SPPF_TARG_FCN) + roles |= FC_RPORT_ROLE_FCP_TARGET; + + rdata->ids.roles = roles; + fc_rport_enter_rtv(rdata); + + } else { + FC_RPORT_DBG(rdata, "Bad ELS response for PRLI command\n"); + fc_rport_error_retry(rdata, fp); + } + +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); +} + +/** + * fc_rport_enter_prli() - Send Process Login (PRLI) request + * @rdata: The remote port to send the PRLI request to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_prli(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct { + struct fc_els_prli prli; + struct fc_els_spp spp; + } *pp; + struct fc_frame *fp; + struct fc4_prov *prov; + + /* + * If the rport is one of the well known addresses + * we skip PRLI and RTV and go straight to READY. + */ + if (rdata->ids.port_id >= FC_FID_DOM_MGR) { + fc_rport_enter_ready(rdata); + return; + } + + FC_RPORT_DBG(rdata, "Port entered PRLI state from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_PRLI); + + fp = fc_frame_alloc(lport, sizeof(*pp)); + if (!fp) { + fc_rport_error_retry(rdata, fp); + return; + } + + fc_prli_fill(lport, fp); + + prov = fc_passive_prov[FC_TYPE_FCP]; + if (prov) { + pp = fc_frame_payload_get(fp, sizeof(*pp)); + prov->prli(rdata, sizeof(pp->spp), NULL, &pp->spp); + } + + fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rdata->ids.port_id, + fc_host_port_id(lport->host), FC_TYPE_ELS, + FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); + + if (!lport->tt.exch_seq_send(lport, fp, fc_rport_prli_resp, + NULL, rdata, 2 * lport->r_a_tov)) + fc_rport_error_retry(rdata, NULL); + else + kref_get(&rdata->kref); +} + +/** + * fc_rport_els_rtv_resp() - Handler for Request Timeout Value (RTV) responses + * @sp: The sequence the RTV was on + * @fp: The RTV response frame + * @rdata_arg: The remote port that sent the RTV response + * + * Many targets don't seem to support this. + * + * Locking Note: This function will be called without the rport lock + * held, but it will lock, call an _enter_* function or fc_rport_error + * and then unlock the rport. + */ +static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + u8 op; + + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received a RTV %s\n", fc_els_resp_type(fp)); + + if (rdata->rp_state != RPORT_ST_RTV) { + FC_RPORT_DBG(rdata, "Received a RTV response, but in state " + "%s\n", fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error(rdata, fp); + goto err; + } + + op = fc_frame_payload_op(fp); + if (op == ELS_LS_ACC) { + struct fc_els_rtv_acc *rtv; + u32 toq; + u32 tov; + + rtv = fc_frame_payload_get(fp, sizeof(*rtv)); + if (rtv) { + toq = ntohl(rtv->rtv_toq); + tov = ntohl(rtv->rtv_r_a_tov); + if (tov == 0) + tov = 1; + rdata->r_a_tov = tov; + tov = ntohl(rtv->rtv_e_d_tov); + if (toq & FC_ELS_RTV_EDRES) + tov /= 1000000; + if (tov == 0) + tov = 1; + rdata->e_d_tov = tov; + } + } + + fc_rport_enter_ready(rdata); + +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); +} + +/** + * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request + * @rdata: The remote port to send the RTV request to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) +{ + struct fc_frame *fp; + struct fc_lport *lport = rdata->local_port; + + FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_RTV); + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_rtv)); + if (!fp) { + fc_rport_error_retry(rdata, fp); + return; + } + + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_RTV, + fc_rport_rtv_resp, rdata, + 2 * lport->r_a_tov)) + fc_rport_error_retry(rdata, NULL); + else + kref_get(&rdata->kref); +} + +/** + * fc_rport_logo_resp() - Handler for logout (LOGO) responses + * @sp: The sequence the LOGO was on + * @fp: The LOGO response frame + * @lport_arg: The local port + */ +static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, + void *lport_arg) +{ + struct fc_lport *lport = lport_arg; + + FC_RPORT_ID_DBG(lport, fc_seq_exch(sp)->did, + "Received a LOGO %s\n", fc_els_resp_type(fp)); + if (IS_ERR(fp)) + return; + fc_frame_free(fp); +} + +/** + * fc_rport_enter_logo() - Send a logout (LOGO) request + * @rdata: The remote port to send the LOGO request to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_logo(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + + FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n", + fc_rport_state(rdata)); + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_logo)); + if (!fp) + return; + (void)lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_LOGO, + fc_rport_logo_resp, lport, 0); +} + +/** + * fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses + * @sp: The sequence the ADISC response was on + * @fp: The ADISC response frame + * @rdata_arg: The remote port that sent the ADISC response + * + * Locking Note: This function will be called without the rport lock + * held, but it will lock, call an _enter_* function or fc_rport_error + * and then unlock the rport. + */ +static void fc_rport_adisc_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + struct fc_els_adisc *adisc; + u8 op; + + mutex_lock(&rdata->rp_mutex); + + FC_RPORT_DBG(rdata, "Received a ADISC response\n"); + + if (rdata->rp_state != RPORT_ST_ADISC) { + FC_RPORT_DBG(rdata, "Received a ADISC resp but in state %s\n", + fc_rport_state(rdata)); + if (IS_ERR(fp)) + goto err; + goto out; + } + + if (IS_ERR(fp)) { + fc_rport_error(rdata, fp); + goto err; + } + + /* + * If address verification failed. Consider us logged out of the rport. + * Since the rport is still in discovery, we want to be + * logged in, so go to PLOGI state. Otherwise, go back to READY. + */ + op = fc_frame_payload_op(fp); + adisc = fc_frame_payload_get(fp, sizeof(*adisc)); + if (op != ELS_LS_ACC || !adisc || + ntoh24(adisc->adisc_port_id) != rdata->ids.port_id || + get_unaligned_be64(&adisc->adisc_wwpn) != rdata->ids.port_name || + get_unaligned_be64(&adisc->adisc_wwnn) != rdata->ids.node_name) { + FC_RPORT_DBG(rdata, "ADISC error or mismatch\n"); + fc_rport_enter_flogi(rdata); + } else { + FC_RPORT_DBG(rdata, "ADISC OK\n"); + fc_rport_enter_ready(rdata); + } +out: + fc_frame_free(fp); +err: + mutex_unlock(&rdata->rp_mutex); + kref_put(&rdata->kref, rdata->local_port->tt.rport_destroy); +} + +/** + * fc_rport_enter_adisc() - Send Address Discover (ADISC) request + * @rdata: The remote port to send the ADISC request to + * + * Locking Note: The rport lock is expected to be held before calling + * this routine. + */ +static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + + FC_RPORT_DBG(rdata, "sending ADISC from %s state\n", + fc_rport_state(rdata)); + + fc_rport_state_enter(rdata, RPORT_ST_ADISC); + + fp = fc_frame_alloc(lport, sizeof(struct fc_els_adisc)); + if (!fp) { + fc_rport_error_retry(rdata, fp); + return; + } + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, ELS_ADISC, + fc_rport_adisc_resp, rdata, + 2 * lport->r_a_tov)) + fc_rport_error_retry(rdata, NULL); + else + kref_get(&rdata->kref); +} + +/** + * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests + * @rdata: The remote port that sent the ADISC request + * @in_fp: The ADISC request frame + * + * Locking Note: Called with the lport and rport locks held. + */ +static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata, + struct fc_frame *in_fp) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + struct fc_els_adisc *adisc; + struct fc_seq_els_data rjt_data; + + FC_RPORT_DBG(rdata, "Received ADISC request\n"); + + adisc = fc_frame_payload_get(in_fp, sizeof(*adisc)); + if (!adisc) { + rjt_data.reason = ELS_RJT_PROT; + rjt_data.explan = ELS_EXPL_INV_LEN; + lport->tt.seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data); + goto drop; + } + + fp = fc_frame_alloc(lport, sizeof(*adisc)); + if (!fp) + goto drop; + fc_adisc_fill(lport, fp); + adisc = fc_frame_payload_get(fp, sizeof(*adisc)); + adisc->adisc_cmd = ELS_LS_ACC; + fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); +drop: + fc_frame_free(in_fp); +} + +/** + * fc_rport_recv_rls_req() - Handle received Read Link Status request + * @rdata: The remote port that sent the RLS request + * @rx_fp: The PRLI request frame + * + * Locking Note: The rport lock is expected to be held before calling + * this function. + */ +static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata, + struct fc_frame *rx_fp) + +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + struct fc_els_rls *rls; + struct fc_els_rls_resp *rsp; + struct fc_els_lesb *lesb; + struct fc_seq_els_data rjt_data; + struct fc_host_statistics *hst; + + FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n", + fc_rport_state(rdata)); + + rls = fc_frame_payload_get(rx_fp, sizeof(*rls)); + if (!rls) { + rjt_data.reason = ELS_RJT_PROT; + rjt_data.explan = ELS_EXPL_INV_LEN; + goto out_rjt; + } + + fp = fc_frame_alloc(lport, sizeof(*rsp)); + if (!fp) { + rjt_data.reason = ELS_RJT_UNAB; + rjt_data.explan = ELS_EXPL_INSUF_RES; + goto out_rjt; + } + + rsp = fc_frame_payload_get(fp, sizeof(*rsp)); + memset(rsp, 0, sizeof(*rsp)); + rsp->rls_cmd = ELS_LS_ACC; + lesb = &rsp->rls_lesb; + if (lport->tt.get_lesb) { + /* get LESB from LLD if it supports it */ + lport->tt.get_lesb(lport, lesb); + } else { + fc_get_host_stats(lport->host); + hst = &lport->host_stats; + lesb->lesb_link_fail = htonl(hst->link_failure_count); + lesb->lesb_sync_loss = htonl(hst->loss_of_sync_count); + lesb->lesb_sig_loss = htonl(hst->loss_of_signal_count); + lesb->lesb_prim_err = htonl(hst->prim_seq_protocol_err_count); + lesb->lesb_inv_word = htonl(hst->invalid_tx_word_count); + lesb->lesb_inv_crc = htonl(hst->invalid_crc_count); + } + + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + goto out; + +out_rjt: + lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); +out: + fc_frame_free(rx_fp); +} + +/** + * fc_rport_recv_els_req() - Handler for validated ELS requests + * @lport: The local port that received the ELS request + * @fp: The ELS request frame + * + * Handle incoming ELS requests that require port login. + * The ELS opcode has already been validated by the caller. + * + * Locking Note: Called with the lport lock held. + */ +static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp) +{ + struct fc_rport_priv *rdata; + struct fc_seq_els_data els_data; + + mutex_lock(&lport->disc.disc_mutex); + rdata = lport->tt.rport_lookup(lport, fc_frame_sid(fp)); + if (!rdata) { + mutex_unlock(&lport->disc.disc_mutex); + goto reject; + } + mutex_lock(&rdata->rp_mutex); + mutex_unlock(&lport->disc.disc_mutex); + + switch (rdata->rp_state) { + case RPORT_ST_PRLI: + case RPORT_ST_RTV: + case RPORT_ST_READY: + case RPORT_ST_ADISC: + break; + default: + mutex_unlock(&rdata->rp_mutex); + goto reject; + } + + switch (fc_frame_payload_op(fp)) { + case ELS_PRLI: + fc_rport_recv_prli_req(rdata, fp); + break; + case ELS_PRLO: + fc_rport_recv_prlo_req(rdata, fp); + break; + case ELS_ADISC: + fc_rport_recv_adisc_req(rdata, fp); + break; + case ELS_RRQ: + lport->tt.seq_els_rsp_send(fp, ELS_RRQ, NULL); + fc_frame_free(fp); + break; + case ELS_REC: + lport->tt.seq_els_rsp_send(fp, ELS_REC, NULL); + fc_frame_free(fp); + break; + case ELS_RLS: + fc_rport_recv_rls_req(rdata, fp); + break; + default: + fc_frame_free(fp); /* can't happen */ + break; + } + + mutex_unlock(&rdata->rp_mutex); + return; + +reject: + els_data.reason = ELS_RJT_UNAB; + els_data.explan = ELS_EXPL_PLOGI_REQD; + lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data); + fc_frame_free(fp); +} + +/** + * fc_rport_recv_req() - Handler for requests + * @lport: The local port that received the request + * @fp: The request frame + * + * Locking Note: Called with the lport lock held. + */ +static void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp) +{ + struct fc_seq_els_data els_data; + + /* + * Handle FLOGI, PLOGI and LOGO requests separately, since they + * don't require prior login. + * Check for unsupported opcodes first and reject them. + * For some ops, it would be incorrect to reject with "PLOGI required". + */ + switch (fc_frame_payload_op(fp)) { + case ELS_FLOGI: + fc_rport_recv_flogi_req(lport, fp); + break; + case ELS_PLOGI: + fc_rport_recv_plogi_req(lport, fp); + break; + case ELS_LOGO: + fc_rport_recv_logo_req(lport, fp); + break; + case ELS_PRLI: + case ELS_PRLO: + case ELS_ADISC: + case ELS_RRQ: + case ELS_REC: + case ELS_RLS: + fc_rport_recv_els_req(lport, fp); + break; + default: + els_data.reason = ELS_RJT_UNSUP; + els_data.explan = ELS_EXPL_NONE; + lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &els_data); + fc_frame_free(fp); + break; + } +} + +/** + * fc_rport_recv_plogi_req() - Handler for Port Login (PLOGI) requests + * @lport: The local port that received the PLOGI request + * @rx_fp: The PLOGI request frame + * + * Locking Note: The rport lock is held before calling this function. + */ +static void fc_rport_recv_plogi_req(struct fc_lport *lport, + struct fc_frame *rx_fp) +{ + struct fc_disc *disc; + struct fc_rport_priv *rdata; + struct fc_frame *fp = rx_fp; + struct fc_els_flogi *pl; + struct fc_seq_els_data rjt_data; + u32 sid; + + sid = fc_frame_sid(fp); + + FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n"); + + pl = fc_frame_payload_get(fp, sizeof(*pl)); + if (!pl) { + FC_RPORT_ID_DBG(lport, sid, "Received PLOGI too short\n"); + rjt_data.reason = ELS_RJT_PROT; + rjt_data.explan = ELS_EXPL_INV_LEN; + goto reject; + } + + disc = &lport->disc; + mutex_lock(&disc->disc_mutex); + rdata = lport->tt.rport_create(lport, sid); + if (!rdata) { + mutex_unlock(&disc->disc_mutex); + rjt_data.reason = ELS_RJT_UNAB; + rjt_data.explan = ELS_EXPL_INSUF_RES; + goto reject; + } + + mutex_lock(&rdata->rp_mutex); + mutex_unlock(&disc->disc_mutex); + + rdata->ids.port_name = get_unaligned_be64(&pl->fl_wwpn); + rdata->ids.node_name = get_unaligned_be64(&pl->fl_wwnn); + + /* + * If the rport was just created, possibly due to the incoming PLOGI, + * set the state appropriately and accept the PLOGI. + * + * If we had also sent a PLOGI, and if the received PLOGI is from a + * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason + * "command already in progress". + * + * XXX TBD: If the session was ready before, the PLOGI should result in + * all outstanding exchanges being reset. + */ + switch (rdata->rp_state) { + case RPORT_ST_INIT: + FC_RPORT_DBG(rdata, "Received PLOGI in INIT state\n"); + break; + case RPORT_ST_PLOGI_WAIT: + FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI_WAIT state\n"); + break; + case RPORT_ST_PLOGI: + FC_RPORT_DBG(rdata, "Received PLOGI in PLOGI state\n"); + if (rdata->ids.port_name < lport->wwpn) { + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_INPROG; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + break; + case RPORT_ST_PRLI: + case RPORT_ST_RTV: + case RPORT_ST_READY: + case RPORT_ST_ADISC: + FC_RPORT_DBG(rdata, "Received PLOGI in logged-in state %d " + "- ignored for now\n", rdata->rp_state); + /* XXX TBD - should reset */ + break; + case RPORT_ST_FLOGI: + case RPORT_ST_DELETE: + FC_RPORT_DBG(rdata, "Received PLOGI in state %s - send busy\n", + fc_rport_state(rdata)); + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_BUSY; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + if (!fc_rport_compatible_roles(lport, rdata)) { + FC_RPORT_DBG(rdata, "Received PLOGI for incompatible role\n"); + mutex_unlock(&rdata->rp_mutex); + rjt_data.reason = ELS_RJT_LOGIC; + rjt_data.explan = ELS_EXPL_NONE; + goto reject; + } + + /* + * Get session payload size from incoming PLOGI. + */ + rdata->maxframe_size = fc_plogi_get_maxframe(pl, lport->mfs); + + /* + * Send LS_ACC. If this fails, the originator should retry. + */ + fp = fc_frame_alloc(lport, sizeof(*pl)); + if (!fp) + goto out; + + fc_plogi_fill(lport, fp, ELS_LS_ACC); + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + fc_rport_enter_prli(rdata); +out: + mutex_unlock(&rdata->rp_mutex); + fc_frame_free(rx_fp); + return; + +reject: + lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); + fc_frame_free(fp); +} + +/** + * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests + * @rdata: The remote port that sent the PRLI request + * @rx_fp: The PRLI request frame + * + * Locking Note: The rport lock is expected to be held before calling + * this function. + */ +static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, + struct fc_frame *rx_fp) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + struct { + struct fc_els_prli prli; + struct fc_els_spp spp; + } *pp; + struct fc_els_spp *rspp; /* request service param page */ + struct fc_els_spp *spp; /* response spp */ + unsigned int len; + unsigned int plen; + enum fc_els_spp_resp resp; + enum fc_els_spp_resp passive; + struct fc_seq_els_data rjt_data; + struct fc4_prov *prov; + + FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n", + fc_rport_state(rdata)); + + len = fr_len(rx_fp) - sizeof(struct fc_frame_header); + pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); + if (!pp) + goto reject_len; + plen = ntohs(pp->prli.prli_len); + if ((plen % 4) != 0 || plen > len || plen < 16) + goto reject_len; + if (plen < len) + len = plen; + plen = pp->prli.prli_spp_len; + if ((plen % 4) != 0 || plen < sizeof(*spp) || + plen > len || len < sizeof(*pp) || plen < 12) + goto reject_len; + rspp = &pp->spp; + + fp = fc_frame_alloc(lport, len); + if (!fp) { + rjt_data.reason = ELS_RJT_UNAB; + rjt_data.explan = ELS_EXPL_INSUF_RES; + goto reject; + } + pp = fc_frame_payload_get(fp, len); + WARN_ON(!pp); + memset(pp, 0, len); + pp->prli.prli_cmd = ELS_LS_ACC; + pp->prli.prli_spp_len = plen; + pp->prli.prli_len = htons(len); + len -= sizeof(struct fc_els_prli); + + /* + * Go through all the service parameter pages and build + * response. If plen indicates longer SPP than standard, + * use that. The entire response has been pre-cleared above. + */ + spp = &pp->spp; + mutex_lock(&fc_prov_mutex); + while (len >= plen) { + rdata->spp_type = rspp->spp_type; + spp->spp_type = rspp->spp_type; + spp->spp_type_ext = rspp->spp_type_ext; + resp = 0; + + if (rspp->spp_type < FC_FC4_PROV_SIZE) { + prov = fc_active_prov[rspp->spp_type]; + if (prov) + resp = prov->prli(rdata, plen, rspp, spp); + prov = fc_passive_prov[rspp->spp_type]; + if (prov) { + passive = prov->prli(rdata, plen, rspp, spp); + if (!resp || passive == FC_SPP_RESP_ACK) + resp = passive; + } + } + if (!resp) { + if (spp->spp_flags & FC_SPP_EST_IMG_PAIR) + resp |= FC_SPP_RESP_CONF; + else + resp |= FC_SPP_RESP_INVL; + } + spp->spp_flags |= resp; + len -= plen; + rspp = (struct fc_els_spp *)((char *)rspp + plen); + spp = (struct fc_els_spp *)((char *)spp + plen); + } + mutex_unlock(&fc_prov_mutex); + + /* + * Send LS_ACC. If this fails, the originator should retry. + */ + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + + switch (rdata->rp_state) { + case RPORT_ST_PRLI: + fc_rport_enter_ready(rdata); + break; + default: + break; + } + goto drop; + +reject_len: + rjt_data.reason = ELS_RJT_PROT; + rjt_data.explan = ELS_EXPL_INV_LEN; +reject: + lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); +drop: + fc_frame_free(rx_fp); +} + +/** + * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests + * @rdata: The remote port that sent the PRLO request + * @rx_fp: The PRLO request frame + * + * Locking Note: The rport lock is expected to be held before calling + * this function. + */ +static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata, + struct fc_frame *rx_fp) +{ + struct fc_lport *lport = rdata->local_port; + struct fc_frame *fp; + struct { + struct fc_els_prlo prlo; + struct fc_els_spp spp; + } *pp; + struct fc_els_spp *rspp; /* request service param page */ + struct fc_els_spp *spp; /* response spp */ + unsigned int len; + unsigned int plen; + struct fc_seq_els_data rjt_data; + + FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n", + fc_rport_state(rdata)); + + len = fr_len(rx_fp) - sizeof(struct fc_frame_header); + pp = fc_frame_payload_get(rx_fp, sizeof(*pp)); + if (!pp) + goto reject_len; + plen = ntohs(pp->prlo.prlo_len); + if (plen != 20) + goto reject_len; + if (plen < len) + len = plen; + + rspp = &pp->spp; + + fp = fc_frame_alloc(lport, len); + if (!fp) { + rjt_data.reason = ELS_RJT_UNAB; + rjt_data.explan = ELS_EXPL_INSUF_RES; + goto reject; + } + + pp = fc_frame_payload_get(fp, len); + WARN_ON(!pp); + memset(pp, 0, len); + pp->prlo.prlo_cmd = ELS_LS_ACC; + pp->prlo.prlo_obs = 0x10; + pp->prlo.prlo_len = htons(len); + spp = &pp->spp; + spp->spp_type = rspp->spp_type; + spp->spp_type_ext = rspp->spp_type_ext; + spp->spp_flags = FC_SPP_RESP_ACK; + + fc_rport_enter_delete(rdata, RPORT_EV_LOGO); + + fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); + lport->tt.frame_send(lport, fp); + goto drop; + +reject_len: + rjt_data.reason = ELS_RJT_PROT; + rjt_data.explan = ELS_EXPL_INV_LEN; +reject: + lport->tt.seq_els_rsp_send(rx_fp, ELS_LS_RJT, &rjt_data); +drop: + fc_frame_free(rx_fp); +} + +/** + * fc_rport_recv_logo_req() - Handler for logout (LOGO) requests + * @lport: The local port that received the LOGO request + * @fp: The LOGO request frame + * + * Locking Note: The rport lock is expected to be held before calling + * this function. + */ +static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp) +{ + struct fc_rport_priv *rdata; + u32 sid; + + lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); + + sid = fc_frame_sid(fp); + + mutex_lock(&lport->disc.disc_mutex); + rdata = lport->tt.rport_lookup(lport, sid); + if (rdata) { + mutex_lock(&rdata->rp_mutex); + FC_RPORT_DBG(rdata, "Received LOGO request while in state %s\n", + fc_rport_state(rdata)); + + fc_rport_enter_delete(rdata, RPORT_EV_LOGO); + mutex_unlock(&rdata->rp_mutex); + } else + FC_RPORT_ID_DBG(lport, sid, + "Received LOGO from non-logged-in port\n"); + mutex_unlock(&lport->disc.disc_mutex); + fc_frame_free(fp); +} + +/** + * fc_rport_flush_queue() - Flush the rport_event_queue + */ +static void fc_rport_flush_queue(void) +{ + flush_workqueue(rport_event_queue); +} + +/** + * fc_rport_init() - Initialize the remote port layer for a local port + * @lport: The local port to initialize the remote port layer for + */ +int fc_rport_init(struct fc_lport *lport) +{ + if (!lport->tt.rport_lookup) + lport->tt.rport_lookup = fc_rport_lookup; + + if (!lport->tt.rport_create) + lport->tt.rport_create = fc_rport_create; + + if (!lport->tt.rport_login) + lport->tt.rport_login = fc_rport_login; + + if (!lport->tt.rport_logoff) + lport->tt.rport_logoff = fc_rport_logoff; + + if (!lport->tt.rport_recv_req) + lport->tt.rport_recv_req = fc_rport_recv_req; + + if (!lport->tt.rport_flush_queue) + lport->tt.rport_flush_queue = fc_rport_flush_queue; + + if (!lport->tt.rport_destroy) + lport->tt.rport_destroy = fc_rport_destroy; + + return 0; +} +EXPORT_SYMBOL(fc_rport_init); + +/** + * fc_rport_fcp_prli() - Handle incoming PRLI for the FCP initiator. + * @rdata: remote port private + * @spp_len: service parameter page length + * @rspp: received service parameter page + * @spp: response service parameter page + * + * Returns the value for the response code to be placed in spp_flags; + * Returns 0 if not an initiator. + */ +static int fc_rport_fcp_prli(struct fc_rport_priv *rdata, u32 spp_len, + const struct fc_els_spp *rspp, + struct fc_els_spp *spp) +{ + struct fc_lport *lport = rdata->local_port; + u32 fcp_parm; + + fcp_parm = ntohl(rspp->spp_params); + rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN; + if (fcp_parm & FCP_SPPF_INIT_FCN) + rdata->ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR; + if (fcp_parm & FCP_SPPF_TARG_FCN) + rdata->ids.roles |= FC_RPORT_ROLE_FCP_TARGET; + if (fcp_parm & FCP_SPPF_RETRY) + rdata->flags |= FC_RP_FLAGS_RETRY; + rdata->supported_classes = FC_COS_CLASS3; + + if (!(lport->service_params & FCP_SPPF_INIT_FCN)) + return 0; + + spp->spp_flags |= rspp->spp_flags & FC_SPP_EST_IMG_PAIR; + + /* + * OR in our service parameters with other providers (target), if any. + */ + fcp_parm = ntohl(spp->spp_params); + spp->spp_params = htonl(fcp_parm | lport->service_params); + return FC_SPP_RESP_ACK; +} + +/* + * FC-4 provider ops for FCP initiator. + */ +struct fc4_prov fc_rport_fcp_init = { + .prli = fc_rport_fcp_prli, +}; + +/** + * fc_rport_t0_prli() - Handle incoming PRLI parameters for type 0 + * @rdata: remote port private + * @spp_len: service parameter page length + * @rspp: received service parameter page + * @spp: response service parameter page + */ +static int fc_rport_t0_prli(struct fc_rport_priv *rdata, u32 spp_len, + const struct fc_els_spp *rspp, + struct fc_els_spp *spp) +{ + if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) + return FC_SPP_RESP_INVL; + return FC_SPP_RESP_ACK; +} + +/* + * FC-4 provider ops for type 0 service parameters. + * + * This handles the special case of type 0 which is always successful + * but doesn't do anything otherwise. + */ +struct fc4_prov fc_rport_t0_prov = { + .prli = fc_rport_t0_prli, +}; + +/** + * fc_setup_rport() - Initialize the rport_event_queue + */ +int fc_setup_rport(void) +{ + rport_event_queue = create_singlethread_workqueue("fc_rport_eq"); + if (!rport_event_queue) + return -ENOMEM; + return 0; +} + +/** + * fc_destroy_rport() - Destroy the rport_event_queue + */ +void fc_destroy_rport(void) +{ + destroy_workqueue(rport_event_queue); +} + +/** + * fc_rport_terminate_io() - Stop all outstanding I/O on a remote port + * @rport: The remote port whose I/O should be terminated + */ +void fc_rport_terminate_io(struct fc_rport *rport) +{ + struct fc_rport_libfc_priv *rpriv = rport->dd_data; + struct fc_lport *lport = rpriv->local_port; + + lport->tt.exch_mgr_reset(lport, 0, rport->port_id); + lport->tt.exch_mgr_reset(lport, rport->port_id, 0); +} +EXPORT_SYMBOL(fc_rport_terminate_io); |