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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/infiniband/ulp/iser
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/infiniband/ulp/iser')
-rw-r--r--kernel/drivers/infiniband/ulp/iser/Kconfig12
-rw-r--r--kernel/drivers/infiniband/ulp/iser/Makefile4
-rw-r--r--kernel/drivers/infiniband/ulp/iser/iscsi_iser.c1089
-rw-r--r--kernel/drivers/infiniband/ulp/iser/iscsi_iser.h644
-rw-r--r--kernel/drivers/infiniband/ulp/iser/iser_initiator.c728
-rw-r--r--kernel/drivers/infiniband/ulp/iser/iser_memory.c859
-rw-r--r--kernel/drivers/infiniband/ulp/iser/iser_verbs.c1274
7 files changed, 4610 insertions, 0 deletions
diff --git a/kernel/drivers/infiniband/ulp/iser/Kconfig b/kernel/drivers/infiniband/ulp/iser/Kconfig
new file mode 100644
index 000000000..d00af71a2
--- /dev/null
+++ b/kernel/drivers/infiniband/ulp/iser/Kconfig
@@ -0,0 +1,12 @@
+config INFINIBAND_ISER
+ tristate "iSCSI Extensions for RDMA (iSER)"
+ depends on SCSI && INET && INFINIBAND_ADDR_TRANS
+ select SCSI_ISCSI_ATTRS
+ ---help---
+ Support for the iSCSI Extensions for RDMA (iSER) Protocol
+ over InfiniBand. This allows you to access storage devices
+ that speak iSCSI over iSER over InfiniBand.
+
+ The iSER protocol is defined by IETF.
+ See <http://www.ietf.org/rfc/rfc5046.txt>
+ and <http://members.infinibandta.org/kwspub/spec/Annex_iSER.PDF>
diff --git a/kernel/drivers/infiniband/ulp/iser/Makefile b/kernel/drivers/infiniband/ulp/iser/Makefile
new file mode 100644
index 000000000..fe6cd15f2
--- /dev/null
+++ b/kernel/drivers/infiniband/ulp/iser/Makefile
@@ -0,0 +1,4 @@
+obj-$(CONFIG_INFINIBAND_ISER) += ib_iser.o
+
+ib_iser-y := iser_verbs.o iser_initiator.o iser_memory.o \
+ iscsi_iser.o
diff --git a/kernel/drivers/infiniband/ulp/iser/iscsi_iser.c b/kernel/drivers/infiniband/ulp/iser/iscsi_iser.c
new file mode 100644
index 000000000..6a594aac2
--- /dev/null
+++ b/kernel/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -0,0 +1,1089 @@
+/*
+ * iSCSI Initiator over iSER Data-Path
+ *
+ * Copyright (C) 2004 Dmitry Yusupov
+ * Copyright (C) 2004 Alex Aizman
+ * Copyright (C) 2005 Mike Christie
+ * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ * maintained by openib-general@openib.org
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Credits:
+ * Christoph Hellwig
+ * FUJITA Tomonori
+ * Arne Redlich
+ * Zhenyu Wang
+ * Modified by:
+ * Erez Zilber
+ */
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/hardirq.h>
+#include <linux/kfifo.h>
+#include <linux/blkdev.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/in.h>
+#include <linux/net.h>
+#include <linux/scatterlist.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#include <net/sock.h>
+
+#include <asm/uaccess.h>
+
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_transport_iscsi.h>
+
+#include "iscsi_iser.h"
+
+static struct scsi_host_template iscsi_iser_sht;
+static struct iscsi_transport iscsi_iser_transport;
+static struct scsi_transport_template *iscsi_iser_scsi_transport;
+
+static unsigned int iscsi_max_lun = 512;
+module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
+
+int iser_debug_level = 0;
+bool iser_pi_enable = false;
+int iser_pi_guard = 1;
+
+MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
+MODULE_VERSION(DRV_VER);
+
+module_param_named(debug_level, iser_debug_level, int, 0644);
+MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
+
+module_param_named(pi_enable, iser_pi_enable, bool, 0644);
+MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
+
+module_param_named(pi_guard, iser_pi_guard, int, 0644);
+MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]");
+
+static struct workqueue_struct *release_wq;
+struct iser_global ig;
+
+/*
+ * iscsi_iser_recv() - Process a successfull recv completion
+ * @conn: iscsi connection
+ * @hdr: iscsi header
+ * @rx_data: buffer containing receive data payload
+ * @rx_data_len: length of rx_data
+ *
+ * Notes: In case of data length errors or iscsi PDU completion failures
+ * this routine will signal iscsi layer of connection failure.
+ */
+void
+iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
+ char *rx_data, int rx_data_len)
+{
+ int rc = 0;
+ int datalen;
+ int ahslen;
+
+ /* verify PDU length */
+ datalen = ntoh24(hdr->dlength);
+ if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
+ iser_err("wrong datalen %d (hdr), %d (IB)\n",
+ datalen, rx_data_len);
+ rc = ISCSI_ERR_DATALEN;
+ goto error;
+ }
+
+ if (datalen != rx_data_len)
+ iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
+ datalen, rx_data_len);
+
+ /* read AHS */
+ ahslen = hdr->hlength * 4;
+
+ rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
+ if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
+ goto error;
+
+ return;
+error:
+ iscsi_conn_failure(conn, rc);
+}
+
+/**
+ * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU
+ * @task: iscsi task
+ * @opcode: iscsi command opcode
+ *
+ * Netes: This routine can't fail, just assign iscsi task
+ * hdr and max hdr size.
+ */
+static int
+iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+
+ task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
+ task->hdr_max = sizeof(iser_task->desc.iscsi_header);
+
+ return 0;
+}
+
+/**
+ * iser_initialize_task_headers() - Initialize task headers
+ * @task: iscsi task
+ * @tx_desc: iser tx descriptor
+ *
+ * Notes:
+ * This routine may race with iser teardown flow for scsi
+ * error handling TMFs. So for TMF we should acquire the
+ * state mutex to avoid dereferencing the IB device which
+ * may have already been terminated.
+ */
+int
+iser_initialize_task_headers(struct iscsi_task *task,
+ struct iser_tx_desc *tx_desc)
+{
+ struct iser_conn *iser_conn = task->conn->dd_data;
+ struct iser_device *device = iser_conn->ib_conn.device;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ u64 dma_addr;
+ const bool mgmt_task = !task->sc && !in_interrupt();
+ int ret = 0;
+
+ if (unlikely(mgmt_task))
+ mutex_lock(&iser_conn->state_mutex);
+
+ if (unlikely(iser_conn->state != ISER_CONN_UP)) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+ if (ib_dma_mapping_error(device->ib_device, dma_addr)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ tx_desc->dma_addr = dma_addr;
+ tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
+ tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
+ tx_desc->tx_sg[0].lkey = device->mr->lkey;
+
+ iser_task->iser_conn = iser_conn;
+out:
+ if (unlikely(mgmt_task))
+ mutex_unlock(&iser_conn->state_mutex);
+
+ return ret;
+}
+
+/**
+ * iscsi_iser_task_init() - Initialize iscsi-iser task
+ * @task: iscsi task
+ *
+ * Initialize the task for the scsi command or mgmt command.
+ *
+ * Return: Returns zero on success or -ENOMEM when failing
+ * to init task headers (dma mapping error).
+ */
+static int
+iscsi_iser_task_init(struct iscsi_task *task)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ int ret;
+
+ ret = iser_initialize_task_headers(task, &iser_task->desc);
+ if (ret) {
+ iser_err("Failed to init task %p, err = %d\n",
+ iser_task, ret);
+ return ret;
+ }
+
+ /* mgmt task */
+ if (!task->sc)
+ return 0;
+
+ iser_task->command_sent = 0;
+ iser_task_rdma_init(iser_task);
+ iser_task->sc = task->sc;
+
+ return 0;
+}
+
+/**
+ * iscsi_iser_mtask_xmit() - xmit management (immediate) task
+ * @conn: iscsi connection
+ * @task: task management task
+ *
+ * Notes:
+ * The function can return -EAGAIN in which case caller must
+ * call it again later, or recover. '0' return code means successful
+ * xmit.
+ *
+ **/
+static int
+iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
+{
+ int error = 0;
+
+ iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
+
+ error = iser_send_control(conn, task);
+
+ /* since iser xmits control with zero copy, tasks can not be recycled
+ * right after sending them.
+ * The recycling scheme is based on whether a response is expected
+ * - if yes, the task is recycled at iscsi_complete_pdu
+ * - if no, the task is recycled at iser_snd_completion
+ */
+ return error;
+}
+
+static int
+iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
+ struct iscsi_task *task)
+{
+ struct iscsi_r2t_info *r2t = &task->unsol_r2t;
+ struct iscsi_data hdr;
+ int error = 0;
+
+ /* Send data-out PDUs while there's still unsolicited data to send */
+ while (iscsi_task_has_unsol_data(task)) {
+ iscsi_prep_data_out_pdu(task, r2t, &hdr);
+ iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
+ hdr.itt, r2t->data_count);
+
+ /* the buffer description has been passed with the command */
+ /* Send the command */
+ error = iser_send_data_out(conn, task, &hdr);
+ if (error) {
+ r2t->datasn--;
+ goto iscsi_iser_task_xmit_unsol_data_exit;
+ }
+ r2t->sent += r2t->data_count;
+ iser_dbg("Need to send %d more as data-out PDUs\n",
+ r2t->data_length - r2t->sent);
+ }
+
+iscsi_iser_task_xmit_unsol_data_exit:
+ return error;
+}
+
+/**
+ * iscsi_iser_task_xmit() - xmit iscsi-iser task
+ * @task: iscsi task
+ *
+ * Return: zero on success or escalates $error on failure.
+ */
+static int
+iscsi_iser_task_xmit(struct iscsi_task *task)
+{
+ struct iscsi_conn *conn = task->conn;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ int error = 0;
+
+ if (!task->sc)
+ return iscsi_iser_mtask_xmit(conn, task);
+
+ if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
+ BUG_ON(scsi_bufflen(task->sc) == 0);
+
+ iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
+ task->itt, scsi_bufflen(task->sc),
+ task->imm_count, task->unsol_r2t.data_length);
+ }
+
+ iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
+ conn->id, task->itt);
+
+ /* Send the cmd PDU */
+ if (!iser_task->command_sent) {
+ error = iser_send_command(conn, task);
+ if (error)
+ goto iscsi_iser_task_xmit_exit;
+ iser_task->command_sent = 1;
+ }
+
+ /* Send unsolicited data-out PDU(s) if necessary */
+ if (iscsi_task_has_unsol_data(task))
+ error = iscsi_iser_task_xmit_unsol_data(conn, task);
+
+ iscsi_iser_task_xmit_exit:
+ return error;
+}
+
+/**
+ * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task
+ * @task: iscsi task
+ *
+ * Notes: In case the RDMA device is already NULL (might have
+ * been removed in DEVICE_REMOVAL CM event it will bail-out
+ * without doing dma unmapping.
+ */
+static void iscsi_iser_cleanup_task(struct iscsi_task *task)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_tx_desc *tx_desc = &iser_task->desc;
+ struct iser_conn *iser_conn = task->conn->dd_data;
+ struct iser_device *device = iser_conn->ib_conn.device;
+
+ /* DEVICE_REMOVAL event might have already released the device */
+ if (!device)
+ return;
+
+ ib_dma_unmap_single(device->ib_device,
+ tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+ /* mgmt tasks do not need special cleanup */
+ if (!task->sc)
+ return;
+
+ if (iser_task->status == ISER_TASK_STATUS_STARTED) {
+ iser_task->status = ISER_TASK_STATUS_COMPLETED;
+ iser_task_rdma_finalize(iser_task);
+ }
+}
+
+/**
+ * iscsi_iser_check_protection() - check protection information status of task.
+ * @task: iscsi task
+ * @sector: error sector if exsists (output)
+ *
+ * Return: zero if no data-integrity errors have occured
+ * 0x1: data-integrity error occured in the guard-block
+ * 0x2: data-integrity error occured in the reference tag
+ * 0x3: data-integrity error occured in the application tag
+ *
+ * In addition the error sector is marked.
+ */
+static u8
+iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+
+ if (iser_task->dir[ISER_DIR_IN])
+ return iser_check_task_pi_status(iser_task, ISER_DIR_IN,
+ sector);
+ else
+ return iser_check_task_pi_status(iser_task, ISER_DIR_OUT,
+ sector);
+}
+
+/**
+ * iscsi_iser_conn_create() - create a new iscsi-iser connection
+ * @cls_session: iscsi class connection
+ * @conn_idx: connection index within the session (for MCS)
+ *
+ * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL
+ * otherwise.
+ */
+static struct iscsi_cls_conn *
+iscsi_iser_conn_create(struct iscsi_cls_session *cls_session,
+ uint32_t conn_idx)
+{
+ struct iscsi_conn *conn;
+ struct iscsi_cls_conn *cls_conn;
+
+ cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx);
+ if (!cls_conn)
+ return NULL;
+ conn = cls_conn->dd_data;
+
+ /*
+ * due to issues with the login code re iser sematics
+ * this not set in iscsi_conn_setup - FIXME
+ */
+ conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
+
+ return cls_conn;
+}
+
+/**
+ * iscsi_iser_conn_bind() - bind iscsi and iser connection structures
+ * @cls_session: iscsi class session
+ * @cls_conn: iscsi class connection
+ * @transport_eph: transport end-point handle
+ * @is_leading: indicate if this is the session leading connection (MCS)
+ *
+ * Return: zero on success, $error if iscsi_conn_bind fails and
+ * -EINVAL in case end-point doesn't exsits anymore or iser connection
+ * state is not UP (teardown already started).
+ */
+static int
+iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
+ struct iscsi_cls_conn *cls_conn,
+ uint64_t transport_eph,
+ int is_leading)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iser_conn *iser_conn;
+ struct iscsi_endpoint *ep;
+ int error;
+
+ error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
+ if (error)
+ return error;
+
+ /* the transport ep handle comes from user space so it must be
+ * verified against the global ib connections list */
+ ep = iscsi_lookup_endpoint(transport_eph);
+ if (!ep) {
+ iser_err("can't bind eph %llx\n",
+ (unsigned long long)transport_eph);
+ return -EINVAL;
+ }
+ iser_conn = ep->dd_data;
+
+ mutex_lock(&iser_conn->state_mutex);
+ if (iser_conn->state != ISER_CONN_UP) {
+ error = -EINVAL;
+ iser_err("iser_conn %p state is %d, teardown started\n",
+ iser_conn, iser_conn->state);
+ goto out;
+ }
+
+ error = iser_alloc_rx_descriptors(iser_conn, conn->session);
+ if (error)
+ goto out;
+
+ /* binds the iSER connection retrieved from the previously
+ * connected ep_handle to the iSCSI layer connection. exchanges
+ * connection pointers */
+ iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn);
+
+ conn->dd_data = iser_conn;
+ iser_conn->iscsi_conn = conn;
+
+out:
+ mutex_unlock(&iser_conn->state_mutex);
+ return error;
+}
+
+/**
+ * iscsi_iser_conn_start() - start iscsi-iser connection
+ * @cls_conn: iscsi class connection
+ *
+ * Notes: Here iser intialize (or re-initialize) stop_completion as
+ * from this point iscsi must call conn_stop in session/connection
+ * teardown so iser transport must wait for it.
+ */
+static int
+iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
+{
+ struct iscsi_conn *iscsi_conn;
+ struct iser_conn *iser_conn;
+
+ iscsi_conn = cls_conn->dd_data;
+ iser_conn = iscsi_conn->dd_data;
+ reinit_completion(&iser_conn->stop_completion);
+
+ return iscsi_conn_start(cls_conn);
+}
+
+/**
+ * iscsi_iser_conn_stop() - stop iscsi-iser connection
+ * @cls_conn: iscsi class connection
+ * @flag: indicate if recover or terminate (passed as is)
+ *
+ * Notes: Calling iscsi_conn_stop might theoretically race with
+ * DEVICE_REMOVAL event and dereference a previously freed RDMA device
+ * handle, so we call it under iser the state lock to protect against
+ * this kind of race.
+ */
+static void
+iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iser_conn *iser_conn = conn->dd_data;
+
+ iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn);
+
+ /*
+ * Userspace may have goofed up and not bound the connection or
+ * might have only partially setup the connection.
+ */
+ if (iser_conn) {
+ mutex_lock(&iser_conn->state_mutex);
+ iser_conn_terminate(iser_conn);
+ iscsi_conn_stop(cls_conn, flag);
+
+ /* unbind */
+ iser_conn->iscsi_conn = NULL;
+ conn->dd_data = NULL;
+
+ complete(&iser_conn->stop_completion);
+ mutex_unlock(&iser_conn->state_mutex);
+ } else {
+ iscsi_conn_stop(cls_conn, flag);
+ }
+}
+
+/**
+ * iscsi_iser_session_destroy() - destroy iscsi-iser session
+ * @cls_session: iscsi class session
+ *
+ * Removes and free iscsi host.
+ */
+static void
+iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
+{
+ struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
+
+ iscsi_session_teardown(cls_session);
+ iscsi_host_remove(shost);
+ iscsi_host_free(shost);
+}
+
+static inline unsigned int
+iser_dif_prot_caps(int prot_caps)
+{
+ return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ?
+ SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION |
+ SHOST_DIX_TYPE1_PROTECTION : 0) |
+ ((prot_caps & IB_PROT_T10DIF_TYPE_2) ?
+ SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION : 0) |
+ ((prot_caps & IB_PROT_T10DIF_TYPE_3) ?
+ SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION : 0);
+}
+
+/**
+ * iscsi_iser_session_create() - create an iscsi-iser session
+ * @ep: iscsi end-point handle
+ * @cmds_max: maximum commands in this session
+ * @qdepth: session command queue depth
+ * @initial_cmdsn: initiator command sequnce number
+ *
+ * Allocates and adds a scsi host, expose DIF supprot if
+ * exists, and sets up an iscsi session.
+ */
+static struct iscsi_cls_session *
+iscsi_iser_session_create(struct iscsi_endpoint *ep,
+ uint16_t cmds_max, uint16_t qdepth,
+ uint32_t initial_cmdsn)
+{
+ struct iscsi_cls_session *cls_session;
+ struct iscsi_session *session;
+ struct Scsi_Host *shost;
+ struct iser_conn *iser_conn = NULL;
+ struct ib_conn *ib_conn;
+ u16 max_cmds;
+
+ shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
+ if (!shost)
+ return NULL;
+ shost->transportt = iscsi_iser_scsi_transport;
+ shost->cmd_per_lun = qdepth;
+ shost->max_lun = iscsi_max_lun;
+ shost->max_id = 0;
+ shost->max_channel = 0;
+ shost->max_cmd_len = 16;
+
+ /*
+ * older userspace tools (before 2.0-870) did not pass us
+ * the leading conn's ep so this will be NULL;
+ */
+ if (ep) {
+ iser_conn = ep->dd_data;
+ max_cmds = iser_conn->max_cmds;
+
+ mutex_lock(&iser_conn->state_mutex);
+ if (iser_conn->state != ISER_CONN_UP) {
+ iser_err("iser conn %p already started teardown\n",
+ iser_conn);
+ mutex_unlock(&iser_conn->state_mutex);
+ goto free_host;
+ }
+
+ ib_conn = &iser_conn->ib_conn;
+ if (ib_conn->pi_support) {
+ u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap;
+
+ scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
+ scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP |
+ SHOST_DIX_GUARD_CRC);
+ }
+
+ if (iscsi_host_add(shost,
+ ib_conn->device->ib_device->dma_device)) {
+ mutex_unlock(&iser_conn->state_mutex);
+ goto free_host;
+ }
+ mutex_unlock(&iser_conn->state_mutex);
+ } else {
+ max_cmds = ISER_DEF_XMIT_CMDS_MAX;
+ if (iscsi_host_add(shost, NULL))
+ goto free_host;
+ }
+
+ if (cmds_max > max_cmds) {
+ iser_info("cmds_max changed from %u to %u\n",
+ cmds_max, max_cmds);
+ cmds_max = max_cmds;
+ }
+
+ cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
+ cmds_max, 0,
+ sizeof(struct iscsi_iser_task),
+ initial_cmdsn, 0);
+ if (!cls_session)
+ goto remove_host;
+ session = cls_session->dd_data;
+
+ shost->can_queue = session->scsi_cmds_max;
+ return cls_session;
+
+remove_host:
+ iscsi_host_remove(shost);
+free_host:
+ iscsi_host_free(shost);
+ return NULL;
+}
+
+static int
+iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf, int buflen)
+{
+ int value;
+
+ switch (param) {
+ case ISCSI_PARAM_MAX_RECV_DLENGTH:
+ /* TBD */
+ break;
+ case ISCSI_PARAM_HDRDGST_EN:
+ sscanf(buf, "%d", &value);
+ if (value) {
+ iser_err("DataDigest wasn't negotiated to None\n");
+ return -EPROTO;
+ }
+ break;
+ case ISCSI_PARAM_DATADGST_EN:
+ sscanf(buf, "%d", &value);
+ if (value) {
+ iser_err("DataDigest wasn't negotiated to None\n");
+ return -EPROTO;
+ }
+ break;
+ case ISCSI_PARAM_IFMARKER_EN:
+ sscanf(buf, "%d", &value);
+ if (value) {
+ iser_err("IFMarker wasn't negotiated to No\n");
+ return -EPROTO;
+ }
+ break;
+ case ISCSI_PARAM_OFMARKER_EN:
+ sscanf(buf, "%d", &value);
+ if (value) {
+ iser_err("OFMarker wasn't negotiated to No\n");
+ return -EPROTO;
+ }
+ break;
+ default:
+ return iscsi_set_param(cls_conn, param, buf, buflen);
+ }
+
+ return 0;
+}
+
+/**
+ * iscsi_iser_set_param() - set class connection parameter
+ * @cls_conn: iscsi class connection
+ * @stats: iscsi stats to output
+ *
+ * Output connection statistics.
+ */
+static void
+iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+
+ stats->txdata_octets = conn->txdata_octets;
+ stats->rxdata_octets = conn->rxdata_octets;
+ stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
+ stats->dataout_pdus = conn->dataout_pdus_cnt;
+ stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
+ stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
+ stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
+ stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
+ stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
+ stats->custom_length = 4;
+ strcpy(stats->custom[0].desc, "qp_tx_queue_full");
+ stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
+ strcpy(stats->custom[1].desc, "fmr_map_not_avail");
+ stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
+ strcpy(stats->custom[2].desc, "eh_abort_cnt");
+ stats->custom[2].value = conn->eh_abort_cnt;
+ strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
+ stats->custom[3].value = conn->fmr_unalign_cnt;
+}
+
+static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
+ enum iscsi_param param, char *buf)
+{
+ struct iser_conn *iser_conn = ep->dd_data;
+ int len;
+
+ switch (param) {
+ case ISCSI_PARAM_CONN_PORT:
+ case ISCSI_PARAM_CONN_ADDRESS:
+ if (!iser_conn || !iser_conn->ib_conn.cma_id)
+ return -ENOTCONN;
+
+ return iscsi_conn_get_addr_param((struct sockaddr_storage *)
+ &iser_conn->ib_conn.cma_id->route.addr.dst_addr,
+ param, buf);
+ break;
+ default:
+ return -ENOSYS;
+ }
+
+ return len;
+}
+
+/**
+ * iscsi_iser_ep_connect() - Initiate iSER connection establishment
+ * @shost: scsi_host
+ * @dst_addr: destination address
+ * @non-blocking: indicate if routine can block
+ *
+ * Allocate an iscsi endpoint, an iser_conn structure and bind them.
+ * After that start RDMA connection establishment via rdma_cm. We
+ * don't allocate iser_conn embedded in iscsi_endpoint since in teardown
+ * the endpoint will be destroyed at ep_disconnect while iser_conn will
+ * cleanup its resources asynchronuously.
+ *
+ * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error)
+ * if fails.
+ */
+static struct iscsi_endpoint *
+iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
+ int non_blocking)
+{
+ int err;
+ struct iser_conn *iser_conn;
+ struct iscsi_endpoint *ep;
+
+ ep = iscsi_create_endpoint(0);
+ if (!ep)
+ return ERR_PTR(-ENOMEM);
+
+ iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
+ if (!iser_conn) {
+ err = -ENOMEM;
+ goto failure;
+ }
+
+ ep->dd_data = iser_conn;
+ iser_conn->ep = ep;
+ iser_conn_init(iser_conn);
+
+ err = iser_connect(iser_conn, NULL, dst_addr, non_blocking);
+ if (err)
+ goto failure;
+
+ return ep;
+failure:
+ iscsi_destroy_endpoint(ep);
+ return ERR_PTR(err);
+}
+
+/**
+ * iscsi_iser_ep_poll() - poll for iser connection establishment to complete
+ * @ep: iscsi endpoint (created at ep_connect)
+ * @timeout_ms: polling timeout allowed in ms.
+ *
+ * This routine boils down to waiting for up_completion signaling
+ * that cma_id got CONNECTED event.
+ *
+ * Return: 1 if succeeded in connection establishment, 0 if timeout expired
+ * (libiscsi will retry will kick in) or -1 if interrupted by signal
+ * or more likely iser connection state transitioned to TEMINATING or
+ * DOWN during the wait period.
+ */
+static int
+iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
+{
+ struct iser_conn *iser_conn;
+ int rc;
+
+ iser_conn = ep->dd_data;
+ rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion,
+ msecs_to_jiffies(timeout_ms));
+ /* if conn establishment failed, return error code to iscsi */
+ if (rc == 0) {
+ mutex_lock(&iser_conn->state_mutex);
+ if (iser_conn->state == ISER_CONN_TERMINATING ||
+ iser_conn->state == ISER_CONN_DOWN)
+ rc = -1;
+ mutex_unlock(&iser_conn->state_mutex);
+ }
+
+ iser_info("ib conn %p rc = %d\n", iser_conn, rc);
+
+ if (rc > 0)
+ return 1; /* success, this is the equivalent of POLLOUT */
+ else if (!rc)
+ return 0; /* timeout */
+ else
+ return rc; /* signal */
+}
+
+/**
+ * iscsi_iser_ep_disconnect() - Initiate connection teardown process
+ * @ep: iscsi endpoint handle
+ *
+ * This routine is not blocked by iser and RDMA termination process
+ * completion as we queue a deffered work for iser/RDMA destruction
+ * and cleanup or actually call it immediately in case we didn't pass
+ * iscsi conn bind/start stage, thus it is safe.
+ */
+static void
+iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
+{
+ struct iser_conn *iser_conn;
+
+ iser_conn = ep->dd_data;
+ iser_info("ep %p iser conn %p state %d\n",
+ ep, iser_conn, iser_conn->state);
+
+ mutex_lock(&iser_conn->state_mutex);
+ iser_conn_terminate(iser_conn);
+
+ /*
+ * if iser_conn and iscsi_conn are bound, we must wait for
+ * iscsi_conn_stop and flush errors completion before freeing
+ * the iser resources. Otherwise we are safe to free resources
+ * immediately.
+ */
+ if (iser_conn->iscsi_conn) {
+ INIT_WORK(&iser_conn->release_work, iser_release_work);
+ queue_work(release_wq, &iser_conn->release_work);
+ mutex_unlock(&iser_conn->state_mutex);
+ } else {
+ iser_conn->state = ISER_CONN_DOWN;
+ mutex_unlock(&iser_conn->state_mutex);
+ iser_conn_release(iser_conn);
+ }
+ iscsi_destroy_endpoint(ep);
+}
+
+static umode_t iser_attr_is_visible(int param_type, int param)
+{
+ switch (param_type) {
+ case ISCSI_HOST_PARAM:
+ switch (param) {
+ case ISCSI_HOST_PARAM_NETDEV_NAME:
+ case ISCSI_HOST_PARAM_HWADDRESS:
+ case ISCSI_HOST_PARAM_INITIATOR_NAME:
+ return S_IRUGO;
+ default:
+ return 0;
+ }
+ case ISCSI_PARAM:
+ switch (param) {
+ case ISCSI_PARAM_MAX_RECV_DLENGTH:
+ case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+ case ISCSI_PARAM_HDRDGST_EN:
+ case ISCSI_PARAM_DATADGST_EN:
+ case ISCSI_PARAM_CONN_ADDRESS:
+ case ISCSI_PARAM_CONN_PORT:
+ case ISCSI_PARAM_EXP_STATSN:
+ case ISCSI_PARAM_PERSISTENT_ADDRESS:
+ case ISCSI_PARAM_PERSISTENT_PORT:
+ case ISCSI_PARAM_PING_TMO:
+ case ISCSI_PARAM_RECV_TMO:
+ case ISCSI_PARAM_INITIAL_R2T_EN:
+ case ISCSI_PARAM_MAX_R2T:
+ case ISCSI_PARAM_IMM_DATA_EN:
+ case ISCSI_PARAM_FIRST_BURST:
+ case ISCSI_PARAM_MAX_BURST:
+ case ISCSI_PARAM_PDU_INORDER_EN:
+ case ISCSI_PARAM_DATASEQ_INORDER_EN:
+ case ISCSI_PARAM_TARGET_NAME:
+ case ISCSI_PARAM_TPGT:
+ case ISCSI_PARAM_USERNAME:
+ case ISCSI_PARAM_PASSWORD:
+ case ISCSI_PARAM_USERNAME_IN:
+ case ISCSI_PARAM_PASSWORD_IN:
+ case ISCSI_PARAM_FAST_ABORT:
+ case ISCSI_PARAM_ABORT_TMO:
+ case ISCSI_PARAM_LU_RESET_TMO:
+ case ISCSI_PARAM_TGT_RESET_TMO:
+ case ISCSI_PARAM_IFACE_NAME:
+ case ISCSI_PARAM_INITIATOR_NAME:
+ case ISCSI_PARAM_DISCOVERY_SESS:
+ return S_IRUGO;
+ default:
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+static struct scsi_host_template iscsi_iser_sht = {
+ .module = THIS_MODULE,
+ .name = "iSCSI Initiator over iSER",
+ .queuecommand = iscsi_queuecommand,
+ .change_queue_depth = scsi_change_queue_depth,
+ .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
+ .max_sectors = 1024,
+ .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
+ .eh_abort_handler = iscsi_eh_abort,
+ .eh_device_reset_handler= iscsi_eh_device_reset,
+ .eh_target_reset_handler = iscsi_eh_recover_target,
+ .target_alloc = iscsi_target_alloc,
+ .use_clustering = DISABLE_CLUSTERING,
+ .proc_name = "iscsi_iser",
+ .this_id = -1,
+ .track_queue_depth = 1,
+};
+
+static struct iscsi_transport iscsi_iser_transport = {
+ .owner = THIS_MODULE,
+ .name = "iser",
+ .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
+ /* session management */
+ .create_session = iscsi_iser_session_create,
+ .destroy_session = iscsi_iser_session_destroy,
+ /* connection management */
+ .create_conn = iscsi_iser_conn_create,
+ .bind_conn = iscsi_iser_conn_bind,
+ .destroy_conn = iscsi_conn_teardown,
+ .attr_is_visible = iser_attr_is_visible,
+ .set_param = iscsi_iser_set_param,
+ .get_conn_param = iscsi_conn_get_param,
+ .get_ep_param = iscsi_iser_get_ep_param,
+ .get_session_param = iscsi_session_get_param,
+ .start_conn = iscsi_iser_conn_start,
+ .stop_conn = iscsi_iser_conn_stop,
+ /* iscsi host params */
+ .get_host_param = iscsi_host_get_param,
+ .set_host_param = iscsi_host_set_param,
+ /* IO */
+ .send_pdu = iscsi_conn_send_pdu,
+ .get_stats = iscsi_iser_conn_get_stats,
+ .init_task = iscsi_iser_task_init,
+ .xmit_task = iscsi_iser_task_xmit,
+ .cleanup_task = iscsi_iser_cleanup_task,
+ .alloc_pdu = iscsi_iser_pdu_alloc,
+ .check_protection = iscsi_iser_check_protection,
+ /* recovery */
+ .session_recovery_timedout = iscsi_session_recovery_timedout,
+
+ .ep_connect = iscsi_iser_ep_connect,
+ .ep_poll = iscsi_iser_ep_poll,
+ .ep_disconnect = iscsi_iser_ep_disconnect
+};
+
+static int __init iser_init(void)
+{
+ int err;
+
+ iser_dbg("Starting iSER datamover...\n");
+
+ if (iscsi_max_lun < 1) {
+ iser_err("Invalid max_lun value of %u\n", iscsi_max_lun);
+ return -EINVAL;
+ }
+
+ memset(&ig, 0, sizeof(struct iser_global));
+
+ ig.desc_cache = kmem_cache_create("iser_descriptors",
+ sizeof(struct iser_tx_desc),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (ig.desc_cache == NULL)
+ return -ENOMEM;
+
+ /* device init is called only after the first addr resolution */
+ mutex_init(&ig.device_list_mutex);
+ INIT_LIST_HEAD(&ig.device_list);
+ mutex_init(&ig.connlist_mutex);
+ INIT_LIST_HEAD(&ig.connlist);
+
+ release_wq = alloc_workqueue("release workqueue", 0, 0);
+ if (!release_wq) {
+ iser_err("failed to allocate release workqueue\n");
+ return -ENOMEM;
+ }
+
+ iscsi_iser_scsi_transport = iscsi_register_transport(
+ &iscsi_iser_transport);
+ if (!iscsi_iser_scsi_transport) {
+ iser_err("iscsi_register_transport failed\n");
+ err = -EINVAL;
+ goto register_transport_failure;
+ }
+
+ return 0;
+
+register_transport_failure:
+ kmem_cache_destroy(ig.desc_cache);
+
+ return err;
+}
+
+static void __exit iser_exit(void)
+{
+ struct iser_conn *iser_conn, *n;
+ int connlist_empty;
+
+ iser_dbg("Removing iSER datamover...\n");
+ destroy_workqueue(release_wq);
+
+ mutex_lock(&ig.connlist_mutex);
+ connlist_empty = list_empty(&ig.connlist);
+ mutex_unlock(&ig.connlist_mutex);
+
+ if (!connlist_empty) {
+ iser_err("Error cleanup stage completed but we still have iser "
+ "connections, destroying them anyway.\n");
+ list_for_each_entry_safe(iser_conn, n, &ig.connlist,
+ conn_list) {
+ iser_conn_release(iser_conn);
+ }
+ }
+
+ iscsi_unregister_transport(&iscsi_iser_transport);
+ kmem_cache_destroy(ig.desc_cache);
+}
+
+module_init(iser_init);
+module_exit(iser_exit);
diff --git a/kernel/drivers/infiniband/ulp/iser/iscsi_iser.h b/kernel/drivers/infiniband/ulp/iser/iscsi_iser.h
new file mode 100644
index 000000000..262ba1f8e
--- /dev/null
+++ b/kernel/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -0,0 +1,644 @@
+/*
+ * iSER transport for the Open iSCSI Initiator & iSER transport internals
+ *
+ * Copyright (C) 2004 Dmitry Yusupov
+ * Copyright (C) 2004 Alex Aizman
+ * Copyright (C) 2005 Mike Christie
+ * based on code maintained by open-iscsi@googlegroups.com
+ *
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ISCSI_ISER_H__
+#define __ISCSI_ISER_H__
+
+#include <linux/types.h>
+#include <linux/net.h>
+#include <linux/printk.h>
+#include <scsi/libiscsi.h>
+#include <scsi/scsi_transport_iscsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/mutex.h>
+#include <linux/mempool.h>
+#include <linux/uio.h>
+
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_fmr_pool.h>
+#include <rdma/rdma_cm.h>
+
+#define DRV_NAME "iser"
+#define PFX DRV_NAME ": "
+#define DRV_VER "1.6"
+
+#define iser_dbg(fmt, arg...) \
+ do { \
+ if (unlikely(iser_debug_level > 2)) \
+ printk(KERN_DEBUG PFX "%s: " fmt,\
+ __func__ , ## arg); \
+ } while (0)
+
+#define iser_warn(fmt, arg...) \
+ do { \
+ if (unlikely(iser_debug_level > 0)) \
+ pr_warn(PFX "%s: " fmt, \
+ __func__ , ## arg); \
+ } while (0)
+
+#define iser_info(fmt, arg...) \
+ do { \
+ if (unlikely(iser_debug_level > 1)) \
+ pr_info(PFX "%s: " fmt, \
+ __func__ , ## arg); \
+ } while (0)
+
+#define iser_err(fmt, arg...) \
+ pr_err(PFX "%s: " fmt, __func__ , ## arg)
+
+#define SHIFT_4K 12
+#define SIZE_4K (1ULL << SHIFT_4K)
+#define MASK_4K (~(SIZE_4K-1))
+ /* support up to 512KB in one RDMA */
+#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
+#define ISER_DEF_XMIT_CMDS_DEFAULT 512
+#if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
+ #define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX
+#else
+ #define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT
+#endif
+#define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX
+
+/* QP settings */
+/* Maximal bounds on received asynchronous PDUs */
+#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
+
+#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
+ * SCSI_TMFUNC(2), LOGOUT(1) */
+
+#define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX)
+
+#define ISER_MIN_POSTED_RX (ISER_DEF_XMIT_CMDS_MAX >> 2)
+
+/* the max TX (send) WR supported by the iSER QP is defined by *
+ * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
+ * to have at max for SCSI command. The tx posting & completion handling code *
+ * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
+ * send WR. D=8 comes from 64K/8K */
+
+#define ISER_INFLIGHT_DATAOUTS 8
+
+#define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \
+ (1 + ISER_INFLIGHT_DATAOUTS) + \
+ ISER_MAX_TX_MISC_PDUS + \
+ ISER_MAX_RX_MISC_PDUS)
+
+/* Max registration work requests per command */
+#define ISER_MAX_REG_WR_PER_CMD 5
+
+/* For Signature we don't support DATAOUTs so no need to make room for them */
+#define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \
+ (1 + ISER_MAX_REG_WR_PER_CMD) + \
+ ISER_MAX_TX_MISC_PDUS + \
+ ISER_MAX_RX_MISC_PDUS)
+
+#define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \
+ - ISER_MAX_TX_MISC_PDUS \
+ - ISER_MAX_RX_MISC_PDUS) / \
+ (1 + ISER_INFLIGHT_DATAOUTS))
+
+#define ISER_WC_BATCH_COUNT 16
+#define ISER_SIGNAL_CMD_COUNT 32
+
+#define ISER_VER 0x10
+#define ISER_WSV 0x08
+#define ISER_RSV 0x04
+
+#define ISER_FASTREG_LI_WRID 0xffffffffffffffffULL
+#define ISER_BEACON_WRID 0xfffffffffffffffeULL
+
+/**
+ * struct iser_hdr - iSER header
+ *
+ * @flags: flags support (zbva, remote_inv)
+ * @rsvd: reserved
+ * @write_stag: write rkey
+ * @write_va: write virtual address
+ * @reaf_stag: read rkey
+ * @read_va: read virtual address
+ */
+struct iser_hdr {
+ u8 flags;
+ u8 rsvd[3];
+ __be32 write_stag;
+ __be64 write_va;
+ __be32 read_stag;
+ __be64 read_va;
+} __attribute__((packed));
+
+
+#define ISER_ZBVA_NOT_SUPPORTED 0x80
+#define ISER_SEND_W_INV_NOT_SUPPORTED 0x40
+
+struct iser_cm_hdr {
+ u8 flags;
+ u8 rsvd[3];
+} __packed;
+
+/* Constant PDU lengths calculations */
+#define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
+
+#define ISER_RECV_DATA_SEG_LEN 128
+#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
+#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
+
+/* Length of an object name string */
+#define ISER_OBJECT_NAME_SIZE 64
+
+enum iser_conn_state {
+ ISER_CONN_INIT, /* descriptor allocd, no conn */
+ ISER_CONN_PENDING, /* in the process of being established */
+ ISER_CONN_UP, /* up and running */
+ ISER_CONN_TERMINATING, /* in the process of being terminated */
+ ISER_CONN_DOWN, /* shut down */
+ ISER_CONN_STATES_NUM
+};
+
+enum iser_task_status {
+ ISER_TASK_STATUS_INIT = 0,
+ ISER_TASK_STATUS_STARTED,
+ ISER_TASK_STATUS_COMPLETED
+};
+
+enum iser_data_dir {
+ ISER_DIR_IN = 0, /* to initiator */
+ ISER_DIR_OUT, /* from initiator */
+ ISER_DIRS_NUM
+};
+
+/**
+ * struct iser_data_buf - iSER data buffer
+ *
+ * @sg: pointer to the sg list
+ * @size: num entries of this sg
+ * @data_len: total beffer byte len
+ * @dma_nents: returned by dma_map_sg
+ * @orig_sg: pointer to the original sg list (in case
+ * we used a copy)
+ * @orig_size: num entris of orig sg list
+ */
+struct iser_data_buf {
+ struct scatterlist *sg;
+ unsigned int size;
+ unsigned long data_len;
+ unsigned int dma_nents;
+ struct scatterlist *orig_sg;
+ unsigned int orig_size;
+ };
+
+/* fwd declarations */
+struct iser_device;
+struct iscsi_iser_task;
+struct iscsi_endpoint;
+
+/**
+ * struct iser_mem_reg - iSER memory registration info
+ *
+ * @sge: memory region sg element
+ * @rkey: memory region remote key
+ * @mem_h: pointer to registration context (FMR/Fastreg)
+ */
+struct iser_mem_reg {
+ struct ib_sge sge;
+ u32 rkey;
+ void *mem_h;
+};
+
+enum iser_desc_type {
+ ISCSI_TX_CONTROL ,
+ ISCSI_TX_SCSI_COMMAND,
+ ISCSI_TX_DATAOUT
+};
+
+/**
+ * struct iser_tx_desc - iSER TX descriptor (for send wr_id)
+ *
+ * @iser_header: iser header
+ * @iscsi_header: iscsi header
+ * @type: command/control/dataout
+ * @dam_addr: header buffer dma_address
+ * @tx_sg: sg[0] points to iser/iscsi headers
+ * sg[1] optionally points to either of immediate data
+ * unsolicited data-out or control
+ * @num_sge: number sges used on this TX task
+ */
+struct iser_tx_desc {
+ struct iser_hdr iser_header;
+ struct iscsi_hdr iscsi_header;
+ enum iser_desc_type type;
+ u64 dma_addr;
+ struct ib_sge tx_sg[2];
+ int num_sge;
+};
+
+#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
+ sizeof(u64) + sizeof(struct ib_sge)))
+/**
+ * struct iser_rx_desc - iSER RX descriptor (for recv wr_id)
+ *
+ * @iser_header: iser header
+ * @iscsi_header: iscsi header
+ * @data: received data segment
+ * @dma_addr: receive buffer dma address
+ * @rx_sg: ib_sge of receive buffer
+ * @pad: for sense data TODO: Modify to maximum sense length supported
+ */
+struct iser_rx_desc {
+ struct iser_hdr iser_header;
+ struct iscsi_hdr iscsi_header;
+ char data[ISER_RECV_DATA_SEG_LEN];
+ u64 dma_addr;
+ struct ib_sge rx_sg;
+ char pad[ISER_RX_PAD_SIZE];
+} __attribute__((packed));
+
+struct iser_conn;
+struct ib_conn;
+struct iscsi_iser_task;
+
+/**
+ * struct iser_comp - iSER completion context
+ *
+ * @device: pointer to device handle
+ * @cq: completion queue
+ * @wcs: work completion array
+ * @tasklet: Tasklet handle
+ * @active_qps: Number of active QPs attached
+ * to completion context
+ */
+struct iser_comp {
+ struct iser_device *device;
+ struct ib_cq *cq;
+ struct ib_wc wcs[ISER_WC_BATCH_COUNT];
+ struct tasklet_struct tasklet;
+ int active_qps;
+};
+
+/**
+ * struct iser_device - iSER device handle
+ *
+ * @ib_device: RDMA device
+ * @pd: Protection Domain for this device
+ * @dev_attr: Device attributes container
+ * @mr: Global DMA memory region
+ * @event_handler: IB events handle routine
+ * @ig_list: entry in devices list
+ * @refcount: Reference counter, dominated by open iser connections
+ * @comps_used: Number of completion contexts used, Min between online
+ * cpus and device max completion vectors
+ * @comps: Dinamically allocated array of completion handlers
+ * Memory registration pool Function pointers (FMR or Fastreg):
+ * @iser_alloc_rdma_reg_res: Allocation of memory regions pool
+ * @iser_free_rdma_reg_res: Free of memory regions pool
+ * @iser_reg_rdma_mem: Memory registration routine
+ * @iser_unreg_rdma_mem: Memory deregistration routine
+ */
+struct iser_device {
+ struct ib_device *ib_device;
+ struct ib_pd *pd;
+ struct ib_device_attr dev_attr;
+ struct ib_mr *mr;
+ struct ib_event_handler event_handler;
+ struct list_head ig_list;
+ int refcount;
+ int comps_used;
+ struct iser_comp *comps;
+ int (*iser_alloc_rdma_reg_res)(struct ib_conn *ib_conn,
+ unsigned cmds_max);
+ void (*iser_free_rdma_reg_res)(struct ib_conn *ib_conn);
+ int (*iser_reg_rdma_mem)(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir);
+ void (*iser_unreg_rdma_mem)(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir);
+};
+
+#define ISER_CHECK_GUARD 0xc0
+#define ISER_CHECK_REFTAG 0x0f
+#define ISER_CHECK_APPTAG 0x30
+
+enum iser_reg_indicator {
+ ISER_DATA_KEY_VALID = 1 << 0,
+ ISER_PROT_KEY_VALID = 1 << 1,
+ ISER_SIG_KEY_VALID = 1 << 2,
+ ISER_FASTREG_PROTECTED = 1 << 3,
+};
+
+/**
+ * struct iser_pi_context - Protection information context
+ *
+ * @prot_mr: protection memory region
+ * @prot_frpl: protection fastreg page list
+ * @sig_mr: signature feature enabled memory region
+ */
+struct iser_pi_context {
+ struct ib_mr *prot_mr;
+ struct ib_fast_reg_page_list *prot_frpl;
+ struct ib_mr *sig_mr;
+};
+
+/**
+ * struct fast_reg_descriptor - Fast registration descriptor
+ *
+ * @list: entry in connection fastreg pool
+ * @data_mr: data memory region
+ * @data_frpl: data fastreg page list
+ * @pi_ctx: protection information context
+ * @reg_indicators: fast registration indicators
+ */
+struct fast_reg_descriptor {
+ struct list_head list;
+ struct ib_mr *data_mr;
+ struct ib_fast_reg_page_list *data_frpl;
+ struct iser_pi_context *pi_ctx;
+ u8 reg_indicators;
+};
+
+/**
+ * struct ib_conn - Infiniband related objects
+ *
+ * @cma_id: rdma_cm connection maneger handle
+ * @qp: Connection Queue-pair
+ * @post_recv_buf_count: post receive counter
+ * @sig_count: send work request signal count
+ * @rx_wr: receive work request for batch posts
+ * @device: reference to iser device
+ * @comp: iser completion context
+ * @pi_support: Indicate device T10-PI support
+ * @beacon: beacon send wr to signal all flush errors were drained
+ * @flush_comp: completes when all connection completions consumed
+ * @lock: protects fmr/fastreg pool
+ * @union.fmr:
+ * @pool: FMR pool for fast registrations
+ * @page_vec: page vector to hold mapped commands pages
+ * used for registration
+ * @union.fastreg:
+ * @pool: Fast registration descriptors pool for fast
+ * registrations
+ * @pool_size: Size of pool
+ */
+struct ib_conn {
+ struct rdma_cm_id *cma_id;
+ struct ib_qp *qp;
+ int post_recv_buf_count;
+ u8 sig_count;
+ struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX];
+ struct iser_device *device;
+ struct iser_comp *comp;
+ bool pi_support;
+ struct ib_send_wr beacon;
+ struct completion flush_comp;
+ spinlock_t lock;
+ union {
+ struct {
+ struct ib_fmr_pool *pool;
+ struct iser_page_vec *page_vec;
+ } fmr;
+ struct {
+ struct list_head pool;
+ int pool_size;
+ } fastreg;
+ };
+};
+
+/**
+ * struct iser_conn - iSER connection context
+ *
+ * @ib_conn: connection RDMA resources
+ * @iscsi_conn: link to matching iscsi connection
+ * @ep: transport handle
+ * @state: connection logical state
+ * @qp_max_recv_dtos: maximum number of data outs, corresponds
+ * to max number of post recvs
+ * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
+ * @min_posted_rx: (qp_max_recv_dtos >> 2)
+ * @max_cmds: maximum cmds allowed for this connection
+ * @name: connection peer portal
+ * @release_work: deffered work for release job
+ * @state_mutex: protects iser onnection state
+ * @stop_completion: conn_stop completion
+ * @ib_completion: RDMA cleanup completion
+ * @up_completion: connection establishment completed
+ * (state is ISER_CONN_UP)
+ * @conn_list: entry in ig conn list
+ * @login_buf: login data buffer (stores login parameters)
+ * @login_req_buf: login request buffer
+ * @login_req_dma: login request buffer dma address
+ * @login_resp_buf: login response buffer
+ * @login_resp_dma: login response buffer dma address
+ * @rx_desc_head: head of rx_descs cyclic buffer
+ * @rx_descs: rx buffers array (cyclic buffer)
+ * @num_rx_descs: number of rx descriptors
+ */
+struct iser_conn {
+ struct ib_conn ib_conn;
+ struct iscsi_conn *iscsi_conn;
+ struct iscsi_endpoint *ep;
+ enum iser_conn_state state;
+ unsigned qp_max_recv_dtos;
+ unsigned qp_max_recv_dtos_mask;
+ unsigned min_posted_rx;
+ u16 max_cmds;
+ char name[ISER_OBJECT_NAME_SIZE];
+ struct work_struct release_work;
+ struct mutex state_mutex;
+ struct completion stop_completion;
+ struct completion ib_completion;
+ struct completion up_completion;
+ struct list_head conn_list;
+
+ char *login_buf;
+ char *login_req_buf, *login_resp_buf;
+ u64 login_req_dma, login_resp_dma;
+ unsigned int rx_desc_head;
+ struct iser_rx_desc *rx_descs;
+ u32 num_rx_descs;
+};
+
+/**
+ * struct iscsi_iser_task - iser task context
+ *
+ * @desc: TX descriptor
+ * @iser_conn: link to iser connection
+ * @status: current task status
+ * @sc: link to scsi command
+ * @command_sent: indicate if command was sent
+ * @dir: iser data direction
+ * @rdma_reg: task rdma registration desc
+ * @data: iser data buffer desc
+ * @prot: iser protection buffer desc
+ */
+struct iscsi_iser_task {
+ struct iser_tx_desc desc;
+ struct iser_conn *iser_conn;
+ enum iser_task_status status;
+ struct scsi_cmnd *sc;
+ int command_sent;
+ int dir[ISER_DIRS_NUM];
+ struct iser_mem_reg rdma_reg[ISER_DIRS_NUM];
+ struct iser_data_buf data[ISER_DIRS_NUM];
+ struct iser_data_buf prot[ISER_DIRS_NUM];
+};
+
+struct iser_page_vec {
+ u64 *pages;
+ int length;
+ int offset;
+ int data_size;
+};
+
+/**
+ * struct iser_global: iSER global context
+ *
+ * @device_list_mutex: protects device_list
+ * @device_list: iser devices global list
+ * @connlist_mutex: protects connlist
+ * @connlist: iser connections global list
+ * @desc_cache: kmem cache for tx dataout
+ */
+struct iser_global {
+ struct mutex device_list_mutex;
+ struct list_head device_list;
+ struct mutex connlist_mutex;
+ struct list_head connlist;
+ struct kmem_cache *desc_cache;
+};
+
+extern struct iser_global ig;
+extern int iser_debug_level;
+extern bool iser_pi_enable;
+extern int iser_pi_guard;
+
+int iser_send_control(struct iscsi_conn *conn,
+ struct iscsi_task *task);
+
+int iser_send_command(struct iscsi_conn *conn,
+ struct iscsi_task *task);
+
+int iser_send_data_out(struct iscsi_conn *conn,
+ struct iscsi_task *task,
+ struct iscsi_data *hdr);
+
+void iscsi_iser_recv(struct iscsi_conn *conn,
+ struct iscsi_hdr *hdr,
+ char *rx_data,
+ int rx_data_len);
+
+void iser_conn_init(struct iser_conn *iser_conn);
+
+void iser_conn_release(struct iser_conn *iser_conn);
+
+int iser_conn_terminate(struct iser_conn *iser_conn);
+
+void iser_release_work(struct work_struct *work);
+
+void iser_rcv_completion(struct iser_rx_desc *desc,
+ unsigned long dto_xfer_len,
+ struct ib_conn *ib_conn);
+
+void iser_snd_completion(struct iser_tx_desc *desc,
+ struct ib_conn *ib_conn);
+
+void iser_task_rdma_init(struct iscsi_iser_task *task);
+
+void iser_task_rdma_finalize(struct iscsi_iser_task *task);
+
+void iser_free_rx_descriptors(struct iser_conn *iser_conn);
+
+void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *mem,
+ enum iser_data_dir cmd_dir);
+
+int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task,
+ enum iser_data_dir cmd_dir);
+int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *task,
+ enum iser_data_dir cmd_dir);
+
+int iser_connect(struct iser_conn *iser_conn,
+ struct sockaddr *src_addr,
+ struct sockaddr *dst_addr,
+ int non_blocking);
+
+void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir);
+void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir);
+
+int iser_post_recvl(struct iser_conn *iser_conn);
+int iser_post_recvm(struct iser_conn *iser_conn, int count);
+int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
+ bool signal);
+
+int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *data,
+ enum iser_data_dir iser_dir,
+ enum dma_data_direction dma_dir);
+
+void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *data,
+ enum dma_data_direction dir);
+
+int iser_initialize_task_headers(struct iscsi_task *task,
+ struct iser_tx_desc *tx_desc);
+int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
+ struct iscsi_session *session);
+int iser_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max);
+void iser_free_fmr_pool(struct ib_conn *ib_conn);
+int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max);
+void iser_free_fastreg_pool(struct ib_conn *ib_conn);
+u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir, sector_t *sector);
+struct fast_reg_descriptor *
+iser_reg_desc_get(struct ib_conn *ib_conn);
+void
+iser_reg_desc_put(struct ib_conn *ib_conn,
+ struct fast_reg_descriptor *desc);
+#endif
diff --git a/kernel/drivers/infiniband/ulp/iser/iser_initiator.c b/kernel/drivers/infiniband/ulp/iser/iser_initiator.c
new file mode 100644
index 000000000..3e2118e8e
--- /dev/null
+++ b/kernel/drivers/infiniband/ulp/iser/iser_initiator.c
@@ -0,0 +1,728 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/kfifo.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+
+#include "iscsi_iser.h"
+
+/* Register user buffer memory and initialize passive rdma
+ * dto descriptor. Data size is stored in
+ * task->data[ISER_DIR_IN].data_len, Protection size
+ * os stored in task->prot[ISER_DIR_IN].data_len
+ */
+static int iser_prepare_read_cmd(struct iscsi_task *task)
+
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_device *device = iser_task->iser_conn->ib_conn.device;
+ struct iser_mem_reg *mem_reg;
+ int err;
+ struct iser_hdr *hdr = &iser_task->desc.iser_header;
+ struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
+
+ err = iser_dma_map_task_data(iser_task,
+ buf_in,
+ ISER_DIR_IN,
+ DMA_FROM_DEVICE);
+ if (err)
+ return err;
+
+ if (scsi_prot_sg_count(iser_task->sc)) {
+ struct iser_data_buf *pbuf_in = &iser_task->prot[ISER_DIR_IN];
+
+ err = iser_dma_map_task_data(iser_task,
+ pbuf_in,
+ ISER_DIR_IN,
+ DMA_FROM_DEVICE);
+ if (err)
+ return err;
+ }
+
+ err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_IN);
+ if (err) {
+ iser_err("Failed to set up Data-IN RDMA\n");
+ return err;
+ }
+ mem_reg = &iser_task->rdma_reg[ISER_DIR_IN];
+
+ hdr->flags |= ISER_RSV;
+ hdr->read_stag = cpu_to_be32(mem_reg->rkey);
+ hdr->read_va = cpu_to_be64(mem_reg->sge.addr);
+
+ iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
+ task->itt, mem_reg->rkey,
+ (unsigned long long)mem_reg->sge.addr);
+
+ return 0;
+}
+
+/* Register user buffer memory and initialize passive rdma
+ * dto descriptor. Data size is stored in
+ * task->data[ISER_DIR_OUT].data_len, Protection size
+ * is stored at task->prot[ISER_DIR_OUT].data_len
+ */
+static int
+iser_prepare_write_cmd(struct iscsi_task *task,
+ unsigned int imm_sz,
+ unsigned int unsol_sz,
+ unsigned int edtl)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_device *device = iser_task->iser_conn->ib_conn.device;
+ struct iser_mem_reg *mem_reg;
+ int err;
+ struct iser_hdr *hdr = &iser_task->desc.iser_header;
+ struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
+ struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
+
+ err = iser_dma_map_task_data(iser_task,
+ buf_out,
+ ISER_DIR_OUT,
+ DMA_TO_DEVICE);
+ if (err)
+ return err;
+
+ if (scsi_prot_sg_count(iser_task->sc)) {
+ struct iser_data_buf *pbuf_out = &iser_task->prot[ISER_DIR_OUT];
+
+ err = iser_dma_map_task_data(iser_task,
+ pbuf_out,
+ ISER_DIR_OUT,
+ DMA_TO_DEVICE);
+ if (err)
+ return err;
+ }
+
+ err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_OUT);
+ if (err != 0) {
+ iser_err("Failed to register write cmd RDMA mem\n");
+ return err;
+ }
+
+ mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
+
+ if (unsol_sz < edtl) {
+ hdr->flags |= ISER_WSV;
+ hdr->write_stag = cpu_to_be32(mem_reg->rkey);
+ hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz);
+
+ iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
+ "VA:%#llX + unsol:%d\n",
+ task->itt, mem_reg->rkey,
+ (unsigned long long)mem_reg->sge.addr, unsol_sz);
+ }
+
+ if (imm_sz > 0) {
+ iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
+ task->itt, imm_sz);
+ tx_dsg->addr = mem_reg->sge.addr;
+ tx_dsg->length = imm_sz;
+ tx_dsg->lkey = mem_reg->sge.lkey;
+ iser_task->desc.num_sge = 2;
+ }
+
+ return 0;
+}
+
+/* creates a new tx descriptor and adds header regd buffer */
+static void iser_create_send_desc(struct iser_conn *iser_conn,
+ struct iser_tx_desc *tx_desc)
+{
+ struct iser_device *device = iser_conn->ib_conn.device;
+
+ ib_dma_sync_single_for_cpu(device->ib_device,
+ tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+ memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
+ tx_desc->iser_header.flags = ISER_VER;
+
+ tx_desc->num_sge = 1;
+
+ if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
+ tx_desc->tx_sg[0].lkey = device->mr->lkey;
+ iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc);
+ }
+}
+
+static void iser_free_login_buf(struct iser_conn *iser_conn)
+{
+ struct iser_device *device = iser_conn->ib_conn.device;
+
+ if (!iser_conn->login_buf)
+ return;
+
+ if (iser_conn->login_req_dma)
+ ib_dma_unmap_single(device->ib_device,
+ iser_conn->login_req_dma,
+ ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
+
+ if (iser_conn->login_resp_dma)
+ ib_dma_unmap_single(device->ib_device,
+ iser_conn->login_resp_dma,
+ ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
+
+ kfree(iser_conn->login_buf);
+
+ /* make sure we never redo any unmapping */
+ iser_conn->login_req_dma = 0;
+ iser_conn->login_resp_dma = 0;
+ iser_conn->login_buf = NULL;
+}
+
+static int iser_alloc_login_buf(struct iser_conn *iser_conn)
+{
+ struct iser_device *device = iser_conn->ib_conn.device;
+ int req_err, resp_err;
+
+ BUG_ON(device == NULL);
+
+ iser_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
+ ISER_RX_LOGIN_SIZE, GFP_KERNEL);
+ if (!iser_conn->login_buf)
+ goto out_err;
+
+ iser_conn->login_req_buf = iser_conn->login_buf;
+ iser_conn->login_resp_buf = iser_conn->login_buf +
+ ISCSI_DEF_MAX_RECV_SEG_LEN;
+
+ iser_conn->login_req_dma = ib_dma_map_single(device->ib_device,
+ iser_conn->login_req_buf,
+ ISCSI_DEF_MAX_RECV_SEG_LEN,
+ DMA_TO_DEVICE);
+
+ iser_conn->login_resp_dma = ib_dma_map_single(device->ib_device,
+ iser_conn->login_resp_buf,
+ ISER_RX_LOGIN_SIZE,
+ DMA_FROM_DEVICE);
+
+ req_err = ib_dma_mapping_error(device->ib_device,
+ iser_conn->login_req_dma);
+ resp_err = ib_dma_mapping_error(device->ib_device,
+ iser_conn->login_resp_dma);
+
+ if (req_err || resp_err) {
+ if (req_err)
+ iser_conn->login_req_dma = 0;
+ if (resp_err)
+ iser_conn->login_resp_dma = 0;
+ goto free_login_buf;
+ }
+ return 0;
+
+free_login_buf:
+ iser_free_login_buf(iser_conn);
+
+out_err:
+ iser_err("unable to alloc or map login buf\n");
+ return -ENOMEM;
+}
+
+int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
+ struct iscsi_session *session)
+{
+ int i, j;
+ u64 dma_addr;
+ struct iser_rx_desc *rx_desc;
+ struct ib_sge *rx_sg;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+
+ iser_conn->qp_max_recv_dtos = session->cmds_max;
+ iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */
+ iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2;
+
+ if (device->iser_alloc_rdma_reg_res(ib_conn, session->scsi_cmds_max))
+ goto create_rdma_reg_res_failed;
+
+ if (iser_alloc_login_buf(iser_conn))
+ goto alloc_login_buf_fail;
+
+ iser_conn->num_rx_descs = session->cmds_max;
+ iser_conn->rx_descs = kmalloc(iser_conn->num_rx_descs *
+ sizeof(struct iser_rx_desc), GFP_KERNEL);
+ if (!iser_conn->rx_descs)
+ goto rx_desc_alloc_fail;
+
+ rx_desc = iser_conn->rx_descs;
+
+ for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {
+ dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ if (ib_dma_mapping_error(device->ib_device, dma_addr))
+ goto rx_desc_dma_map_failed;
+
+ rx_desc->dma_addr = dma_addr;
+
+ rx_sg = &rx_desc->rx_sg;
+ rx_sg->addr = rx_desc->dma_addr;
+ rx_sg->length = ISER_RX_PAYLOAD_SIZE;
+ rx_sg->lkey = device->mr->lkey;
+ }
+
+ iser_conn->rx_desc_head = 0;
+ return 0;
+
+rx_desc_dma_map_failed:
+ rx_desc = iser_conn->rx_descs;
+ for (j = 0; j < i; j++, rx_desc++)
+ ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ kfree(iser_conn->rx_descs);
+ iser_conn->rx_descs = NULL;
+rx_desc_alloc_fail:
+ iser_free_login_buf(iser_conn);
+alloc_login_buf_fail:
+ device->iser_free_rdma_reg_res(ib_conn);
+create_rdma_reg_res_failed:
+ iser_err("failed allocating rx descriptors / data buffers\n");
+ return -ENOMEM;
+}
+
+void iser_free_rx_descriptors(struct iser_conn *iser_conn)
+{
+ int i;
+ struct iser_rx_desc *rx_desc;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+
+ if (device->iser_free_rdma_reg_res)
+ device->iser_free_rdma_reg_res(ib_conn);
+
+ rx_desc = iser_conn->rx_descs;
+ for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
+ ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
+ ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+ kfree(iser_conn->rx_descs);
+ /* make sure we never redo any unmapping */
+ iser_conn->rx_descs = NULL;
+
+ iser_free_login_buf(iser_conn);
+}
+
+static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
+{
+ struct iser_conn *iser_conn = conn->dd_data;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iscsi_session *session = conn->session;
+
+ iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
+ /* check if this is the last login - going to full feature phase */
+ if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
+ return 0;
+
+ /*
+ * Check that there is one posted recv buffer
+ * (for the last login response).
+ */
+ WARN_ON(ib_conn->post_recv_buf_count != 1);
+
+ if (session->discovery_sess) {
+ iser_info("Discovery session, re-using login RX buffer\n");
+ return 0;
+ } else
+ iser_info("Normal session, posting batch of RX %d buffers\n",
+ iser_conn->min_posted_rx);
+
+ /* Initial post receive buffers */
+ if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static inline bool iser_signal_comp(u8 sig_count)
+{
+ return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0);
+}
+
+/**
+ * iser_send_command - send command PDU
+ */
+int iser_send_command(struct iscsi_conn *conn,
+ struct iscsi_task *task)
+{
+ struct iser_conn *iser_conn = conn->dd_data;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ unsigned long edtl;
+ int err;
+ struct iser_data_buf *data_buf, *prot_buf;
+ struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
+ struct scsi_cmnd *sc = task->sc;
+ struct iser_tx_desc *tx_desc = &iser_task->desc;
+ u8 sig_count = ++iser_conn->ib_conn.sig_count;
+
+ edtl = ntohl(hdr->data_length);
+
+ /* build the tx desc regd header and add it to the tx desc dto */
+ tx_desc->type = ISCSI_TX_SCSI_COMMAND;
+ iser_create_send_desc(iser_conn, tx_desc);
+
+ if (hdr->flags & ISCSI_FLAG_CMD_READ) {
+ data_buf = &iser_task->data[ISER_DIR_IN];
+ prot_buf = &iser_task->prot[ISER_DIR_IN];
+ } else {
+ data_buf = &iser_task->data[ISER_DIR_OUT];
+ prot_buf = &iser_task->prot[ISER_DIR_OUT];
+ }
+
+ if (scsi_sg_count(sc)) { /* using a scatter list */
+ data_buf->sg = scsi_sglist(sc);
+ data_buf->size = scsi_sg_count(sc);
+ }
+ data_buf->data_len = scsi_bufflen(sc);
+
+ if (scsi_prot_sg_count(sc)) {
+ prot_buf->sg = scsi_prot_sglist(sc);
+ prot_buf->size = scsi_prot_sg_count(sc);
+ prot_buf->data_len = (data_buf->data_len >>
+ ilog2(sc->device->sector_size)) * 8;
+ }
+
+ if (hdr->flags & ISCSI_FLAG_CMD_READ) {
+ err = iser_prepare_read_cmd(task);
+ if (err)
+ goto send_command_error;
+ }
+ if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
+ err = iser_prepare_write_cmd(task,
+ task->imm_count,
+ task->imm_count +
+ task->unsol_r2t.data_length,
+ edtl);
+ if (err)
+ goto send_command_error;
+ }
+
+ iser_task->status = ISER_TASK_STATUS_STARTED;
+
+ err = iser_post_send(&iser_conn->ib_conn, tx_desc,
+ iser_signal_comp(sig_count));
+ if (!err)
+ return 0;
+
+send_command_error:
+ iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
+ return err;
+}
+
+/**
+ * iser_send_data_out - send data out PDU
+ */
+int iser_send_data_out(struct iscsi_conn *conn,
+ struct iscsi_task *task,
+ struct iscsi_data *hdr)
+{
+ struct iser_conn *iser_conn = conn->dd_data;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_tx_desc *tx_desc = NULL;
+ struct iser_mem_reg *mem_reg;
+ unsigned long buf_offset;
+ unsigned long data_seg_len;
+ uint32_t itt;
+ int err = 0;
+ struct ib_sge *tx_dsg;
+
+ itt = (__force uint32_t)hdr->itt;
+ data_seg_len = ntoh24(hdr->dlength);
+ buf_offset = ntohl(hdr->offset);
+
+ iser_dbg("%s itt %d dseg_len %d offset %d\n",
+ __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
+
+ tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
+ if (tx_desc == NULL) {
+ iser_err("Failed to alloc desc for post dataout\n");
+ return -ENOMEM;
+ }
+
+ tx_desc->type = ISCSI_TX_DATAOUT;
+ tx_desc->iser_header.flags = ISER_VER;
+ memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
+
+ /* build the tx desc */
+ iser_initialize_task_headers(task, tx_desc);
+
+ mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
+ tx_dsg = &tx_desc->tx_sg[1];
+ tx_dsg->addr = mem_reg->sge.addr + buf_offset;
+ tx_dsg->length = data_seg_len;
+ tx_dsg->lkey = mem_reg->sge.lkey;
+ tx_desc->num_sge = 2;
+
+ if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
+ iser_err("Offset:%ld & DSL:%ld in Data-Out "
+ "inconsistent with total len:%ld, itt:%d\n",
+ buf_offset, data_seg_len,
+ iser_task->data[ISER_DIR_OUT].data_len, itt);
+ err = -EINVAL;
+ goto send_data_out_error;
+ }
+ iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
+ itt, buf_offset, data_seg_len);
+
+
+ err = iser_post_send(&iser_conn->ib_conn, tx_desc, true);
+ if (!err)
+ return 0;
+
+send_data_out_error:
+ kmem_cache_free(ig.desc_cache, tx_desc);
+ iser_err("conn %p failed err %d\n",conn, err);
+ return err;
+}
+
+int iser_send_control(struct iscsi_conn *conn,
+ struct iscsi_task *task)
+{
+ struct iser_conn *iser_conn = conn->dd_data;
+ struct iscsi_iser_task *iser_task = task->dd_data;
+ struct iser_tx_desc *mdesc = &iser_task->desc;
+ unsigned long data_seg_len;
+ int err = 0;
+ struct iser_device *device;
+
+ /* build the tx desc regd header and add it to the tx desc dto */
+ mdesc->type = ISCSI_TX_CONTROL;
+ iser_create_send_desc(iser_conn, mdesc);
+
+ device = iser_conn->ib_conn.device;
+
+ data_seg_len = ntoh24(task->hdr->dlength);
+
+ if (data_seg_len > 0) {
+ struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
+ if (task != conn->login_task) {
+ iser_err("data present on non login task!!!\n");
+ goto send_control_error;
+ }
+
+ ib_dma_sync_single_for_cpu(device->ib_device,
+ iser_conn->login_req_dma, task->data_count,
+ DMA_TO_DEVICE);
+
+ memcpy(iser_conn->login_req_buf, task->data, task->data_count);
+
+ ib_dma_sync_single_for_device(device->ib_device,
+ iser_conn->login_req_dma, task->data_count,
+ DMA_TO_DEVICE);
+
+ tx_dsg->addr = iser_conn->login_req_dma;
+ tx_dsg->length = task->data_count;
+ tx_dsg->lkey = device->mr->lkey;
+ mdesc->num_sge = 2;
+ }
+
+ if (task == conn->login_task) {
+ iser_dbg("op %x dsl %lx, posting login rx buffer\n",
+ task->hdr->opcode, data_seg_len);
+ err = iser_post_recvl(iser_conn);
+ if (err)
+ goto send_control_error;
+ err = iser_post_rx_bufs(conn, task->hdr);
+ if (err)
+ goto send_control_error;
+ }
+
+ err = iser_post_send(&iser_conn->ib_conn, mdesc, true);
+ if (!err)
+ return 0;
+
+send_control_error:
+ iser_err("conn %p failed err %d\n",conn, err);
+ return err;
+}
+
+/**
+ * iser_rcv_dto_completion - recv DTO completion
+ */
+void iser_rcv_completion(struct iser_rx_desc *rx_desc,
+ unsigned long rx_xfer_len,
+ struct ib_conn *ib_conn)
+{
+ struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn,
+ ib_conn);
+ struct iscsi_hdr *hdr;
+ u64 rx_dma;
+ int rx_buflen, outstanding, count, err;
+
+ /* differentiate between login to all other PDUs */
+ if ((char *)rx_desc == iser_conn->login_resp_buf) {
+ rx_dma = iser_conn->login_resp_dma;
+ rx_buflen = ISER_RX_LOGIN_SIZE;
+ } else {
+ rx_dma = rx_desc->dma_addr;
+ rx_buflen = ISER_RX_PAYLOAD_SIZE;
+ }
+
+ ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma,
+ rx_buflen, DMA_FROM_DEVICE);
+
+ hdr = &rx_desc->iscsi_header;
+
+ iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
+ hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN));
+
+ iscsi_iser_recv(iser_conn->iscsi_conn, hdr, rx_desc->data,
+ rx_xfer_len - ISER_HEADERS_LEN);
+
+ ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma,
+ rx_buflen, DMA_FROM_DEVICE);
+
+ /* decrementing conn->post_recv_buf_count only --after-- freeing the *
+ * task eliminates the need to worry on tasks which are completed in *
+ * parallel to the execution of iser_conn_term. So the code that waits *
+ * for the posted rx bufs refcount to become zero handles everything */
+ ib_conn->post_recv_buf_count--;
+
+ if (rx_dma == iser_conn->login_resp_dma)
+ return;
+
+ outstanding = ib_conn->post_recv_buf_count;
+ if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) {
+ count = min(iser_conn->qp_max_recv_dtos - outstanding,
+ iser_conn->min_posted_rx);
+ err = iser_post_recvm(iser_conn, count);
+ if (err)
+ iser_err("posting %d rx bufs err %d\n", count, err);
+ }
+}
+
+void iser_snd_completion(struct iser_tx_desc *tx_desc,
+ struct ib_conn *ib_conn)
+{
+ struct iscsi_task *task;
+ struct iser_device *device = ib_conn->device;
+
+ if (tx_desc->type == ISCSI_TX_DATAOUT) {
+ ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
+ ISER_HEADERS_LEN, DMA_TO_DEVICE);
+ kmem_cache_free(ig.desc_cache, tx_desc);
+ tx_desc = NULL;
+ }
+
+ if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) {
+ /* this arithmetic is legal by libiscsi dd_data allocation */
+ task = (void *) ((long)(void *)tx_desc -
+ sizeof(struct iscsi_task));
+ if (task->hdr->itt == RESERVED_ITT)
+ iscsi_put_task(task);
+ }
+}
+
+void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
+
+{
+ iser_task->status = ISER_TASK_STATUS_INIT;
+
+ iser_task->dir[ISER_DIR_IN] = 0;
+ iser_task->dir[ISER_DIR_OUT] = 0;
+
+ iser_task->data[ISER_DIR_IN].data_len = 0;
+ iser_task->data[ISER_DIR_OUT].data_len = 0;
+
+ iser_task->prot[ISER_DIR_IN].data_len = 0;
+ iser_task->prot[ISER_DIR_OUT].data_len = 0;
+
+ memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
+ sizeof(struct iser_mem_reg));
+ memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
+ sizeof(struct iser_mem_reg));
+}
+
+void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
+{
+ struct iser_device *device = iser_task->iser_conn->ib_conn.device;
+ int is_rdma_data_aligned = 1;
+ int is_rdma_prot_aligned = 1;
+ int prot_count = scsi_prot_sg_count(iser_task->sc);
+
+ /* if we were reading, copy back to unaligned sglist,
+ * anyway dma_unmap and free the copy
+ */
+ if (iser_task->data[ISER_DIR_IN].orig_sg) {
+ is_rdma_data_aligned = 0;
+ iser_finalize_rdma_unaligned_sg(iser_task,
+ &iser_task->data[ISER_DIR_IN],
+ ISER_DIR_IN);
+ }
+
+ if (iser_task->data[ISER_DIR_OUT].orig_sg) {
+ is_rdma_data_aligned = 0;
+ iser_finalize_rdma_unaligned_sg(iser_task,
+ &iser_task->data[ISER_DIR_OUT],
+ ISER_DIR_OUT);
+ }
+
+ if (iser_task->prot[ISER_DIR_IN].orig_sg) {
+ is_rdma_prot_aligned = 0;
+ iser_finalize_rdma_unaligned_sg(iser_task,
+ &iser_task->prot[ISER_DIR_IN],
+ ISER_DIR_IN);
+ }
+
+ if (iser_task->prot[ISER_DIR_OUT].orig_sg) {
+ is_rdma_prot_aligned = 0;
+ iser_finalize_rdma_unaligned_sg(iser_task,
+ &iser_task->prot[ISER_DIR_OUT],
+ ISER_DIR_OUT);
+ }
+
+ if (iser_task->dir[ISER_DIR_IN]) {
+ device->iser_unreg_rdma_mem(iser_task, ISER_DIR_IN);
+ if (is_rdma_data_aligned)
+ iser_dma_unmap_task_data(iser_task,
+ &iser_task->data[ISER_DIR_IN],
+ DMA_FROM_DEVICE);
+ if (prot_count && is_rdma_prot_aligned)
+ iser_dma_unmap_task_data(iser_task,
+ &iser_task->prot[ISER_DIR_IN],
+ DMA_FROM_DEVICE);
+ }
+
+ if (iser_task->dir[ISER_DIR_OUT]) {
+ device->iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT);
+ if (is_rdma_data_aligned)
+ iser_dma_unmap_task_data(iser_task,
+ &iser_task->data[ISER_DIR_OUT],
+ DMA_TO_DEVICE);
+ if (prot_count && is_rdma_prot_aligned)
+ iser_dma_unmap_task_data(iser_task,
+ &iser_task->prot[ISER_DIR_OUT],
+ DMA_TO_DEVICE);
+ }
+}
diff --git a/kernel/drivers/infiniband/ulp/iser/iser_memory.c b/kernel/drivers/infiniband/ulp/iser/iser_memory.c
new file mode 100644
index 000000000..f0cdc961e
--- /dev/null
+++ b/kernel/drivers/infiniband/ulp/iser/iser_memory.c
@@ -0,0 +1,859 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/scatterlist.h>
+
+#include "iscsi_iser.h"
+
+static void
+iser_free_bounce_sg(struct iser_data_buf *data)
+{
+ struct scatterlist *sg;
+ int count;
+
+ for_each_sg(data->sg, sg, data->size, count)
+ __free_page(sg_page(sg));
+
+ kfree(data->sg);
+
+ data->sg = data->orig_sg;
+ data->size = data->orig_size;
+ data->orig_sg = NULL;
+ data->orig_size = 0;
+}
+
+static int
+iser_alloc_bounce_sg(struct iser_data_buf *data)
+{
+ struct scatterlist *sg;
+ struct page *page;
+ unsigned long length = data->data_len;
+ int i = 0, nents = DIV_ROUND_UP(length, PAGE_SIZE);
+
+ sg = kcalloc(nents, sizeof(*sg), GFP_ATOMIC);
+ if (!sg)
+ goto err;
+
+ sg_init_table(sg, nents);
+ while (length) {
+ u32 page_len = min_t(u32, length, PAGE_SIZE);
+
+ page = alloc_page(GFP_ATOMIC);
+ if (!page)
+ goto err;
+
+ sg_set_page(&sg[i], page, page_len, 0);
+ length -= page_len;
+ i++;
+ }
+
+ data->orig_sg = data->sg;
+ data->orig_size = data->size;
+ data->sg = sg;
+ data->size = nents;
+
+ return 0;
+
+err:
+ for (; i > 0; i--)
+ __free_page(sg_page(&sg[i - 1]));
+ kfree(sg);
+
+ return -ENOMEM;
+}
+
+static void
+iser_copy_bounce(struct iser_data_buf *data, bool to_buffer)
+{
+ struct scatterlist *osg, *bsg = data->sg;
+ void *oaddr, *baddr;
+ unsigned int left = data->data_len;
+ unsigned int bsg_off = 0;
+ int i;
+
+ for_each_sg(data->orig_sg, osg, data->orig_size, i) {
+ unsigned int copy_len, osg_off = 0;
+
+ oaddr = kmap_atomic(sg_page(osg)) + osg->offset;
+ copy_len = min(left, osg->length);
+ while (copy_len) {
+ unsigned int len = min(copy_len, bsg->length - bsg_off);
+
+ baddr = kmap_atomic(sg_page(bsg)) + bsg->offset;
+ if (to_buffer)
+ memcpy(baddr + bsg_off, oaddr + osg_off, len);
+ else
+ memcpy(oaddr + osg_off, baddr + bsg_off, len);
+
+ kunmap_atomic(baddr - bsg->offset);
+ osg_off += len;
+ bsg_off += len;
+ copy_len -= len;
+
+ if (bsg_off >= bsg->length) {
+ bsg = sg_next(bsg);
+ bsg_off = 0;
+ }
+ }
+ kunmap_atomic(oaddr - osg->offset);
+ left -= osg_off;
+ }
+}
+
+static inline void
+iser_copy_from_bounce(struct iser_data_buf *data)
+{
+ iser_copy_bounce(data, false);
+}
+
+static inline void
+iser_copy_to_bounce(struct iser_data_buf *data)
+{
+ iser_copy_bounce(data, true);
+}
+
+struct fast_reg_descriptor *
+iser_reg_desc_get(struct ib_conn *ib_conn)
+{
+ struct fast_reg_descriptor *desc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ib_conn->lock, flags);
+ desc = list_first_entry(&ib_conn->fastreg.pool,
+ struct fast_reg_descriptor, list);
+ list_del(&desc->list);
+ spin_unlock_irqrestore(&ib_conn->lock, flags);
+
+ return desc;
+}
+
+void
+iser_reg_desc_put(struct ib_conn *ib_conn,
+ struct fast_reg_descriptor *desc)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ib_conn->lock, flags);
+ list_add(&desc->list, &ib_conn->fastreg.pool);
+ spin_unlock_irqrestore(&ib_conn->lock, flags);
+}
+
+/**
+ * iser_start_rdma_unaligned_sg
+ */
+static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *data,
+ enum iser_data_dir cmd_dir)
+{
+ struct ib_device *dev = iser_task->iser_conn->ib_conn.device->ib_device;
+ int rc;
+
+ rc = iser_alloc_bounce_sg(data);
+ if (rc) {
+ iser_err("Failed to allocate bounce for data len %lu\n",
+ data->data_len);
+ return rc;
+ }
+
+ if (cmd_dir == ISER_DIR_OUT)
+ iser_copy_to_bounce(data);
+
+ data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size,
+ (cmd_dir == ISER_DIR_OUT) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ if (!data->dma_nents) {
+ iser_err("Got dma_nents %d, something went wrong...\n",
+ data->dma_nents);
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ return 0;
+err:
+ iser_free_bounce_sg(data);
+ return rc;
+}
+
+/**
+ * iser_finalize_rdma_unaligned_sg
+ */
+
+void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *data,
+ enum iser_data_dir cmd_dir)
+{
+ struct ib_device *dev = iser_task->iser_conn->ib_conn.device->ib_device;
+
+ ib_dma_unmap_sg(dev, data->sg, data->size,
+ (cmd_dir == ISER_DIR_OUT) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE);
+
+ if (cmd_dir == ISER_DIR_IN)
+ iser_copy_from_bounce(data);
+
+ iser_free_bounce_sg(data);
+}
+
+#define IS_4K_ALIGNED(addr) ((((unsigned long)addr) & ~MASK_4K) == 0)
+
+/**
+ * iser_sg_to_page_vec - Translates scatterlist entries to physical addresses
+ * and returns the length of resulting physical address array (may be less than
+ * the original due to possible compaction).
+ *
+ * we build a "page vec" under the assumption that the SG meets the RDMA
+ * alignment requirements. Other then the first and last SG elements, all
+ * the "internal" elements can be compacted into a list whose elements are
+ * dma addresses of physical pages. The code supports also the weird case
+ * where --few fragments of the same page-- are present in the SG as
+ * consecutive elements. Also, it handles one entry SG.
+ */
+
+static int iser_sg_to_page_vec(struct iser_data_buf *data,
+ struct ib_device *ibdev, u64 *pages,
+ int *offset, int *data_size)
+{
+ struct scatterlist *sg, *sgl = data->sg;
+ u64 start_addr, end_addr, page, chunk_start = 0;
+ unsigned long total_sz = 0;
+ unsigned int dma_len;
+ int i, new_chunk, cur_page, last_ent = data->dma_nents - 1;
+
+ /* compute the offset of first element */
+ *offset = (u64) sgl[0].offset & ~MASK_4K;
+
+ new_chunk = 1;
+ cur_page = 0;
+ for_each_sg(sgl, sg, data->dma_nents, i) {
+ start_addr = ib_sg_dma_address(ibdev, sg);
+ if (new_chunk)
+ chunk_start = start_addr;
+ dma_len = ib_sg_dma_len(ibdev, sg);
+ end_addr = start_addr + dma_len;
+ total_sz += dma_len;
+
+ /* collect page fragments until aligned or end of SG list */
+ if (!IS_4K_ALIGNED(end_addr) && i < last_ent) {
+ new_chunk = 0;
+ continue;
+ }
+ new_chunk = 1;
+
+ /* address of the first page in the contiguous chunk;
+ masking relevant for the very first SG entry,
+ which might be unaligned */
+ page = chunk_start & MASK_4K;
+ do {
+ pages[cur_page++] = page;
+ page += SIZE_4K;
+ } while (page < end_addr);
+ }
+
+ *data_size = total_sz;
+ iser_dbg("page_vec->data_size:%d cur_page %d\n",
+ *data_size, cur_page);
+ return cur_page;
+}
+
+
+/**
+ * iser_data_buf_aligned_len - Tries to determine the maximal correctly aligned
+ * for RDMA sub-list of a scatter-gather list of memory buffers, and returns
+ * the number of entries which are aligned correctly. Supports the case where
+ * consecutive SG elements are actually fragments of the same physcial page.
+ */
+static int iser_data_buf_aligned_len(struct iser_data_buf *data,
+ struct ib_device *ibdev)
+{
+ struct scatterlist *sg, *sgl, *next_sg = NULL;
+ u64 start_addr, end_addr;
+ int i, ret_len, start_check = 0;
+
+ if (data->dma_nents == 1)
+ return 1;
+
+ sgl = data->sg;
+ start_addr = ib_sg_dma_address(ibdev, sgl);
+
+ for_each_sg(sgl, sg, data->dma_nents, i) {
+ if (start_check && !IS_4K_ALIGNED(start_addr))
+ break;
+
+ next_sg = sg_next(sg);
+ if (!next_sg)
+ break;
+
+ end_addr = start_addr + ib_sg_dma_len(ibdev, sg);
+ start_addr = ib_sg_dma_address(ibdev, next_sg);
+
+ if (end_addr == start_addr) {
+ start_check = 0;
+ continue;
+ } else
+ start_check = 1;
+
+ if (!IS_4K_ALIGNED(end_addr))
+ break;
+ }
+ ret_len = (next_sg) ? i : i+1;
+ iser_dbg("Found %d aligned entries out of %d in sg:0x%p\n",
+ ret_len, data->dma_nents, data);
+ return ret_len;
+}
+
+static void iser_data_buf_dump(struct iser_data_buf *data,
+ struct ib_device *ibdev)
+{
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(data->sg, sg, data->dma_nents, i)
+ iser_dbg("sg[%d] dma_addr:0x%lX page:0x%p "
+ "off:0x%x sz:0x%x dma_len:0x%x\n",
+ i, (unsigned long)ib_sg_dma_address(ibdev, sg),
+ sg_page(sg), sg->offset,
+ sg->length, ib_sg_dma_len(ibdev, sg));
+}
+
+static void iser_dump_page_vec(struct iser_page_vec *page_vec)
+{
+ int i;
+
+ iser_err("page vec length %d data size %d\n",
+ page_vec->length, page_vec->data_size);
+ for (i = 0; i < page_vec->length; i++)
+ iser_err("%d %lx\n",i,(unsigned long)page_vec->pages[i]);
+}
+
+int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *data,
+ enum iser_data_dir iser_dir,
+ enum dma_data_direction dma_dir)
+{
+ struct ib_device *dev;
+
+ iser_task->dir[iser_dir] = 1;
+ dev = iser_task->iser_conn->ib_conn.device->ib_device;
+
+ data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir);
+ if (data->dma_nents == 0) {
+ iser_err("dma_map_sg failed!!!\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *data,
+ enum dma_data_direction dir)
+{
+ struct ib_device *dev;
+
+ dev = iser_task->iser_conn->ib_conn.device->ib_device;
+ ib_dma_unmap_sg(dev, data->sg, data->size, dir);
+}
+
+static int
+iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem,
+ struct iser_mem_reg *reg)
+{
+ struct scatterlist *sg = mem->sg;
+
+ reg->sge.lkey = device->mr->lkey;
+ reg->rkey = device->mr->rkey;
+ reg->sge.addr = ib_sg_dma_address(device->ib_device, &sg[0]);
+ reg->sge.length = ib_sg_dma_len(device->ib_device, &sg[0]);
+
+ iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
+ " length=0x%x\n", reg->sge.lkey, reg->rkey,
+ reg->sge.addr, reg->sge.length);
+
+ return 0;
+}
+
+static int fall_to_bounce_buf(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *mem,
+ enum iser_data_dir cmd_dir,
+ int aligned_len)
+{
+ struct iscsi_conn *iscsi_conn = iser_task->iser_conn->iscsi_conn;
+ struct iser_device *device = iser_task->iser_conn->ib_conn.device;
+
+ iscsi_conn->fmr_unalign_cnt++;
+ iser_warn("rdma alignment violation (%d/%d aligned) or FMR not supported\n",
+ aligned_len, mem->size);
+
+ if (iser_debug_level > 0)
+ iser_data_buf_dump(mem, device->ib_device);
+
+ /* unmap the command data before accessing it */
+ iser_dma_unmap_task_data(iser_task, mem,
+ (cmd_dir == ISER_DIR_OUT) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE);
+
+ /* allocate copy buf, if we are writing, copy the */
+ /* unaligned scatterlist, dma map the copy */
+ if (iser_start_rdma_unaligned_sg(iser_task, mem, cmd_dir) != 0)
+ return -ENOMEM;
+
+ return 0;
+}
+
+/**
+ * iser_reg_page_vec - Register physical memory
+ *
+ * returns: 0 on success, errno code on failure
+ */
+static
+int iser_reg_page_vec(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *mem,
+ struct iser_page_vec *page_vec,
+ struct iser_mem_reg *mem_reg)
+{
+ struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+ struct ib_pool_fmr *fmr;
+ int ret, plen;
+
+ plen = iser_sg_to_page_vec(mem, device->ib_device,
+ page_vec->pages,
+ &page_vec->offset,
+ &page_vec->data_size);
+ page_vec->length = plen;
+ if (plen * SIZE_4K < page_vec->data_size) {
+ iser_err("page vec too short to hold this SG\n");
+ iser_data_buf_dump(mem, device->ib_device);
+ iser_dump_page_vec(page_vec);
+ return -EINVAL;
+ }
+
+ fmr = ib_fmr_pool_map_phys(ib_conn->fmr.pool,
+ page_vec->pages,
+ page_vec->length,
+ page_vec->pages[0]);
+ if (IS_ERR(fmr)) {
+ ret = PTR_ERR(fmr);
+ iser_err("ib_fmr_pool_map_phys failed: %d\n", ret);
+ return ret;
+ }
+
+ mem_reg->sge.lkey = fmr->fmr->lkey;
+ mem_reg->rkey = fmr->fmr->rkey;
+ mem_reg->sge.addr = page_vec->pages[0] + page_vec->offset;
+ mem_reg->sge.length = page_vec->data_size;
+ mem_reg->mem_h = fmr;
+
+ return 0;
+}
+
+/**
+ * Unregister (previosuly registered using FMR) memory.
+ * If memory is non-FMR does nothing.
+ */
+void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir)
+{
+ struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
+ int ret;
+
+ if (!reg->mem_h)
+ return;
+
+ iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n", reg->mem_h);
+
+ ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
+ if (ret)
+ iser_err("ib_fmr_pool_unmap failed %d\n", ret);
+
+ reg->mem_h = NULL;
+}
+
+void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir)
+{
+ struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
+
+ if (!reg->mem_h)
+ return;
+
+ iser_reg_desc_put(&iser_task->iser_conn->ib_conn,
+ reg->mem_h);
+ reg->mem_h = NULL;
+}
+
+/**
+ * iser_reg_rdma_mem_fmr - Registers memory intended for RDMA,
+ * using FMR (if possible) obtaining rkey and va
+ *
+ * returns 0 on success, errno code on failure
+ */
+int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir)
+{
+ struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+ struct ib_device *ibdev = device->ib_device;
+ struct iser_data_buf *mem = &iser_task->data[cmd_dir];
+ struct iser_mem_reg *mem_reg;
+ int aligned_len;
+ int err;
+ int i;
+
+ mem_reg = &iser_task->rdma_reg[cmd_dir];
+
+ aligned_len = iser_data_buf_aligned_len(mem, ibdev);
+ if (aligned_len != mem->dma_nents) {
+ err = fall_to_bounce_buf(iser_task, mem,
+ cmd_dir, aligned_len);
+ if (err) {
+ iser_err("failed to allocate bounce buffer\n");
+ return err;
+ }
+ }
+
+ /* if there a single dma entry, FMR is not needed */
+ if (mem->dma_nents == 1) {
+ return iser_reg_dma(device, mem, mem_reg);
+ } else { /* use FMR for multiple dma entries */
+ err = iser_reg_page_vec(iser_task, mem, ib_conn->fmr.page_vec,
+ mem_reg);
+ if (err && err != -EAGAIN) {
+ iser_data_buf_dump(mem, ibdev);
+ iser_err("mem->dma_nents = %d (dlength = 0x%x)\n",
+ mem->dma_nents,
+ ntoh24(iser_task->desc.iscsi_header.dlength));
+ iser_err("page_vec: data_size = 0x%x, length = %d, offset = 0x%x\n",
+ ib_conn->fmr.page_vec->data_size,
+ ib_conn->fmr.page_vec->length,
+ ib_conn->fmr.page_vec->offset);
+ for (i = 0; i < ib_conn->fmr.page_vec->length; i++)
+ iser_err("page_vec[%d] = 0x%llx\n", i,
+ (unsigned long long)ib_conn->fmr.page_vec->pages[i]);
+ }
+ if (err)
+ return err;
+ }
+ return 0;
+}
+
+static void
+iser_set_dif_domain(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs,
+ struct ib_sig_domain *domain)
+{
+ domain->sig_type = IB_SIG_TYPE_T10_DIF;
+ domain->sig.dif.pi_interval = scsi_prot_interval(sc);
+ domain->sig.dif.ref_tag = scsi_prot_ref_tag(sc);
+ /*
+ * At the moment we hard code those, but in the future
+ * we will take them from sc.
+ */
+ domain->sig.dif.apptag_check_mask = 0xffff;
+ domain->sig.dif.app_escape = true;
+ domain->sig.dif.ref_escape = true;
+ if (sc->prot_flags & SCSI_PROT_REF_INCREMENT)
+ domain->sig.dif.ref_remap = true;
+};
+
+static int
+iser_set_sig_attrs(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs)
+{
+ switch (scsi_get_prot_op(sc)) {
+ case SCSI_PROT_WRITE_INSERT:
+ case SCSI_PROT_READ_STRIP:
+ sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
+ iser_set_dif_domain(sc, sig_attrs, &sig_attrs->wire);
+ sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
+ break;
+ case SCSI_PROT_READ_INSERT:
+ case SCSI_PROT_WRITE_STRIP:
+ sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
+ iser_set_dif_domain(sc, sig_attrs, &sig_attrs->mem);
+ sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
+ IB_T10DIF_CSUM : IB_T10DIF_CRC;
+ break;
+ case SCSI_PROT_READ_PASS:
+ case SCSI_PROT_WRITE_PASS:
+ iser_set_dif_domain(sc, sig_attrs, &sig_attrs->wire);
+ sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
+ iser_set_dif_domain(sc, sig_attrs, &sig_attrs->mem);
+ sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
+ IB_T10DIF_CSUM : IB_T10DIF_CRC;
+ break;
+ default:
+ iser_err("Unsupported PI operation %d\n",
+ scsi_get_prot_op(sc));
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static inline void
+iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask)
+{
+ *mask = 0;
+ if (sc->prot_flags & SCSI_PROT_REF_CHECK)
+ *mask |= ISER_CHECK_REFTAG;
+ if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
+ *mask |= ISER_CHECK_GUARD;
+}
+
+static void
+iser_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
+{
+ u32 rkey;
+
+ memset(inv_wr, 0, sizeof(*inv_wr));
+ inv_wr->opcode = IB_WR_LOCAL_INV;
+ inv_wr->wr_id = ISER_FASTREG_LI_WRID;
+ inv_wr->ex.invalidate_rkey = mr->rkey;
+
+ rkey = ib_inc_rkey(mr->rkey);
+ ib_update_fast_reg_key(mr, rkey);
+}
+
+static int
+iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
+ struct fast_reg_descriptor *desc,
+ struct iser_mem_reg *data_reg,
+ struct iser_mem_reg *prot_reg,
+ struct iser_mem_reg *sig_reg)
+{
+ struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
+ struct iser_pi_context *pi_ctx = desc->pi_ctx;
+ struct ib_send_wr sig_wr, inv_wr;
+ struct ib_send_wr *bad_wr, *wr = NULL;
+ struct ib_sig_attrs sig_attrs;
+ int ret;
+
+ memset(&sig_attrs, 0, sizeof(sig_attrs));
+ ret = iser_set_sig_attrs(iser_task->sc, &sig_attrs);
+ if (ret)
+ goto err;
+
+ iser_set_prot_checks(iser_task->sc, &sig_attrs.check_mask);
+
+ if (!(desc->reg_indicators & ISER_SIG_KEY_VALID)) {
+ iser_inv_rkey(&inv_wr, pi_ctx->sig_mr);
+ wr = &inv_wr;
+ }
+
+ memset(&sig_wr, 0, sizeof(sig_wr));
+ sig_wr.opcode = IB_WR_REG_SIG_MR;
+ sig_wr.wr_id = ISER_FASTREG_LI_WRID;
+ sig_wr.sg_list = &data_reg->sge;
+ sig_wr.num_sge = 1;
+ sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
+ sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
+ if (scsi_prot_sg_count(iser_task->sc))
+ sig_wr.wr.sig_handover.prot = &prot_reg->sge;
+ sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_READ |
+ IB_ACCESS_REMOTE_WRITE;
+
+ if (!wr)
+ wr = &sig_wr;
+ else
+ wr->next = &sig_wr;
+
+ ret = ib_post_send(ib_conn->qp, wr, &bad_wr);
+ if (ret) {
+ iser_err("reg_sig_mr failed, ret:%d\n", ret);
+ goto err;
+ }
+ desc->reg_indicators &= ~ISER_SIG_KEY_VALID;
+
+ sig_reg->sge.lkey = pi_ctx->sig_mr->lkey;
+ sig_reg->rkey = pi_ctx->sig_mr->rkey;
+ sig_reg->sge.addr = 0;
+ sig_reg->sge.length = scsi_transfer_length(iser_task->sc);
+
+ iser_dbg("sig_sge: lkey: 0x%x, rkey: 0x%x, addr: 0x%llx, length: %u\n",
+ sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr,
+ sig_reg->sge.length);
+err:
+ return ret;
+}
+
+static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
+ struct iser_data_buf *mem,
+ struct fast_reg_descriptor *desc,
+ enum iser_reg_indicator ind,
+ struct iser_mem_reg *reg)
+{
+ struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+ struct ib_mr *mr;
+ struct ib_fast_reg_page_list *frpl;
+ struct ib_send_wr fastreg_wr, inv_wr;
+ struct ib_send_wr *bad_wr, *wr = NULL;
+ int ret, offset, size, plen;
+
+ /* if there a single dma entry, dma mr suffices */
+ if (mem->dma_nents == 1)
+ return iser_reg_dma(device, mem, reg);
+
+ if (ind == ISER_DATA_KEY_VALID) {
+ mr = desc->data_mr;
+ frpl = desc->data_frpl;
+ } else {
+ mr = desc->pi_ctx->prot_mr;
+ frpl = desc->pi_ctx->prot_frpl;
+ }
+
+ plen = iser_sg_to_page_vec(mem, device->ib_device, frpl->page_list,
+ &offset, &size);
+ if (plen * SIZE_4K < size) {
+ iser_err("fast reg page_list too short to hold this SG\n");
+ return -EINVAL;
+ }
+
+ if (!(desc->reg_indicators & ind)) {
+ iser_inv_rkey(&inv_wr, mr);
+ wr = &inv_wr;
+ }
+
+ /* Prepare FASTREG WR */
+ memset(&fastreg_wr, 0, sizeof(fastreg_wr));
+ fastreg_wr.wr_id = ISER_FASTREG_LI_WRID;
+ fastreg_wr.opcode = IB_WR_FAST_REG_MR;
+ fastreg_wr.wr.fast_reg.iova_start = frpl->page_list[0] + offset;
+ fastreg_wr.wr.fast_reg.page_list = frpl;
+ fastreg_wr.wr.fast_reg.page_list_len = plen;
+ fastreg_wr.wr.fast_reg.page_shift = SHIFT_4K;
+ fastreg_wr.wr.fast_reg.length = size;
+ fastreg_wr.wr.fast_reg.rkey = mr->rkey;
+ fastreg_wr.wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE |
+ IB_ACCESS_REMOTE_READ);
+
+ if (!wr)
+ wr = &fastreg_wr;
+ else
+ wr->next = &fastreg_wr;
+
+ ret = ib_post_send(ib_conn->qp, wr, &bad_wr);
+ if (ret) {
+ iser_err("fast registration failed, ret:%d\n", ret);
+ return ret;
+ }
+ desc->reg_indicators &= ~ind;
+
+ reg->sge.lkey = mr->lkey;
+ reg->rkey = mr->rkey;
+ reg->sge.addr = frpl->page_list[0] + offset;
+ reg->sge.length = size;
+
+ return ret;
+}
+
+/**
+ * iser_reg_rdma_mem_fastreg - Registers memory intended for RDMA,
+ * using Fast Registration WR (if possible) obtaining rkey and va
+ *
+ * returns 0 on success, errno code on failure
+ */
+int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir)
+{
+ struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+ struct ib_device *ibdev = device->ib_device;
+ struct iser_data_buf *mem = &iser_task->data[cmd_dir];
+ struct iser_mem_reg *mem_reg = &iser_task->rdma_reg[cmd_dir];
+ struct fast_reg_descriptor *desc = NULL;
+ int err, aligned_len;
+
+ aligned_len = iser_data_buf_aligned_len(mem, ibdev);
+ if (aligned_len != mem->dma_nents) {
+ err = fall_to_bounce_buf(iser_task, mem,
+ cmd_dir, aligned_len);
+ if (err) {
+ iser_err("failed to allocate bounce buffer\n");
+ return err;
+ }
+ }
+
+ if (mem->dma_nents != 1 ||
+ scsi_get_prot_op(iser_task->sc) != SCSI_PROT_NORMAL) {
+ desc = iser_reg_desc_get(ib_conn);
+ mem_reg->mem_h = desc;
+ }
+
+ err = iser_fast_reg_mr(iser_task, mem, desc,
+ ISER_DATA_KEY_VALID, mem_reg);
+ if (err)
+ goto err_reg;
+
+ if (scsi_get_prot_op(iser_task->sc) != SCSI_PROT_NORMAL) {
+ struct iser_mem_reg prot_reg;
+
+ memset(&prot_reg, 0, sizeof(prot_reg));
+ if (scsi_prot_sg_count(iser_task->sc)) {
+ mem = &iser_task->prot[cmd_dir];
+ aligned_len = iser_data_buf_aligned_len(mem, ibdev);
+ if (aligned_len != mem->dma_nents) {
+ err = fall_to_bounce_buf(iser_task, mem,
+ cmd_dir, aligned_len);
+ if (err) {
+ iser_err("failed to allocate bounce buffer\n");
+ return err;
+ }
+ }
+
+ err = iser_fast_reg_mr(iser_task, mem, desc,
+ ISER_PROT_KEY_VALID, &prot_reg);
+ if (err)
+ goto err_reg;
+ }
+
+ err = iser_reg_sig_mr(iser_task, desc, mem_reg,
+ &prot_reg, mem_reg);
+ if (err) {
+ iser_err("Failed to register signature mr\n");
+ return err;
+ }
+ desc->reg_indicators |= ISER_FASTREG_PROTECTED;
+ }
+
+ return 0;
+err_reg:
+ if (desc)
+ iser_reg_desc_put(ib_conn, desc);
+
+ return err;
+}
diff --git a/kernel/drivers/infiniband/ulp/iser/iser_verbs.c b/kernel/drivers/infiniband/ulp/iser/iser_verbs.c
new file mode 100644
index 000000000..cc2dd35ff
--- /dev/null
+++ b/kernel/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -0,0 +1,1274 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#include "iscsi_iser.h"
+
+#define ISCSI_ISER_MAX_CONN 8
+#define ISER_MAX_RX_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN)
+#define ISER_MAX_TX_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN)
+#define ISER_MAX_CQ_LEN (ISER_MAX_RX_LEN + ISER_MAX_TX_LEN + \
+ ISCSI_ISER_MAX_CONN)
+
+static int iser_cq_poll_limit = 512;
+
+static void iser_cq_tasklet_fn(unsigned long data);
+static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
+
+static void iser_cq_event_callback(struct ib_event *cause, void *context)
+{
+ iser_err("got cq event %d \n", cause->event);
+}
+
+static void iser_qp_event_callback(struct ib_event *cause, void *context)
+{
+ iser_err("got qp event %d\n",cause->event);
+}
+
+static void iser_event_handler(struct ib_event_handler *handler,
+ struct ib_event *event)
+{
+ iser_err("async event %d on device %s port %d\n", event->event,
+ event->device->name, event->element.port_num);
+}
+
+/**
+ * iser_create_device_ib_res - creates Protection Domain (PD), Completion
+ * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
+ * the adapator.
+ *
+ * returns 0 on success, -1 on failure
+ */
+static int iser_create_device_ib_res(struct iser_device *device)
+{
+ struct ib_device_attr *dev_attr = &device->dev_attr;
+ int ret, i, max_cqe;
+
+ ret = ib_query_device(device->ib_device, dev_attr);
+ if (ret) {
+ pr_warn("Query device failed for %s\n", device->ib_device->name);
+ return ret;
+ }
+
+ /* Assign function handles - based on FMR support */
+ if (device->ib_device->alloc_fmr && device->ib_device->dealloc_fmr &&
+ device->ib_device->map_phys_fmr && device->ib_device->unmap_fmr) {
+ iser_info("FMR supported, using FMR for registration\n");
+ device->iser_alloc_rdma_reg_res = iser_create_fmr_pool;
+ device->iser_free_rdma_reg_res = iser_free_fmr_pool;
+ device->iser_reg_rdma_mem = iser_reg_rdma_mem_fmr;
+ device->iser_unreg_rdma_mem = iser_unreg_mem_fmr;
+ } else
+ if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
+ iser_info("FastReg supported, using FastReg for registration\n");
+ device->iser_alloc_rdma_reg_res = iser_create_fastreg_pool;
+ device->iser_free_rdma_reg_res = iser_free_fastreg_pool;
+ device->iser_reg_rdma_mem = iser_reg_rdma_mem_fastreg;
+ device->iser_unreg_rdma_mem = iser_unreg_mem_fastreg;
+ } else {
+ iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n");
+ return -1;
+ }
+
+ device->comps_used = min_t(int, num_online_cpus(),
+ device->ib_device->num_comp_vectors);
+
+ device->comps = kcalloc(device->comps_used, sizeof(*device->comps),
+ GFP_KERNEL);
+ if (!device->comps)
+ goto comps_err;
+
+ max_cqe = min(ISER_MAX_CQ_LEN, dev_attr->max_cqe);
+
+ iser_info("using %d CQs, device %s supports %d vectors max_cqe %d\n",
+ device->comps_used, device->ib_device->name,
+ device->ib_device->num_comp_vectors, max_cqe);
+
+ device->pd = ib_alloc_pd(device->ib_device);
+ if (IS_ERR(device->pd))
+ goto pd_err;
+
+ for (i = 0; i < device->comps_used; i++) {
+ struct iser_comp *comp = &device->comps[i];
+
+ comp->device = device;
+ comp->cq = ib_create_cq(device->ib_device,
+ iser_cq_callback,
+ iser_cq_event_callback,
+ (void *)comp,
+ max_cqe, i);
+ if (IS_ERR(comp->cq)) {
+ comp->cq = NULL;
+ goto cq_err;
+ }
+
+ if (ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP))
+ goto cq_err;
+
+ tasklet_init(&comp->tasklet, iser_cq_tasklet_fn,
+ (unsigned long)comp);
+ }
+
+ device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE |
+ IB_ACCESS_REMOTE_READ);
+ if (IS_ERR(device->mr))
+ goto dma_mr_err;
+
+ INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device,
+ iser_event_handler);
+ if (ib_register_event_handler(&device->event_handler))
+ goto handler_err;
+
+ return 0;
+
+handler_err:
+ ib_dereg_mr(device->mr);
+dma_mr_err:
+ for (i = 0; i < device->comps_used; i++)
+ tasklet_kill(&device->comps[i].tasklet);
+cq_err:
+ for (i = 0; i < device->comps_used; i++) {
+ struct iser_comp *comp = &device->comps[i];
+
+ if (comp->cq)
+ ib_destroy_cq(comp->cq);
+ }
+ ib_dealloc_pd(device->pd);
+pd_err:
+ kfree(device->comps);
+comps_err:
+ iser_err("failed to allocate an IB resource\n");
+ return -1;
+}
+
+/**
+ * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,
+ * CQ and PD created with the device associated with the adapator.
+ */
+static void iser_free_device_ib_res(struct iser_device *device)
+{
+ int i;
+ BUG_ON(device->mr == NULL);
+
+ for (i = 0; i < device->comps_used; i++) {
+ struct iser_comp *comp = &device->comps[i];
+
+ tasklet_kill(&comp->tasklet);
+ ib_destroy_cq(comp->cq);
+ comp->cq = NULL;
+ }
+
+ (void)ib_unregister_event_handler(&device->event_handler);
+ (void)ib_dereg_mr(device->mr);
+ (void)ib_dealloc_pd(device->pd);
+
+ kfree(device->comps);
+ device->comps = NULL;
+
+ device->mr = NULL;
+ device->pd = NULL;
+}
+
+/**
+ * iser_create_fmr_pool - Creates FMR pool and page_vector
+ *
+ * returns 0 on success, or errno code on failure
+ */
+int iser_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max)
+{
+ struct iser_device *device = ib_conn->device;
+ struct ib_fmr_pool_param params;
+ int ret = -ENOMEM;
+
+ ib_conn->fmr.page_vec = kmalloc(sizeof(*ib_conn->fmr.page_vec) +
+ (sizeof(u64)*(ISCSI_ISER_SG_TABLESIZE + 1)),
+ GFP_KERNEL);
+ if (!ib_conn->fmr.page_vec)
+ return ret;
+
+ ib_conn->fmr.page_vec->pages = (u64 *)(ib_conn->fmr.page_vec + 1);
+
+ params.page_shift = SHIFT_4K;
+ /* when the first/last SG element are not start/end *
+ * page aligned, the map whould be of N+1 pages */
+ params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
+ /* make the pool size twice the max number of SCSI commands *
+ * the ML is expected to queue, watermark for unmap at 50% */
+ params.pool_size = cmds_max * 2;
+ params.dirty_watermark = cmds_max;
+ params.cache = 0;
+ params.flush_function = NULL;
+ params.access = (IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE |
+ IB_ACCESS_REMOTE_READ);
+
+ ib_conn->fmr.pool = ib_create_fmr_pool(device->pd, &params);
+ if (!IS_ERR(ib_conn->fmr.pool))
+ return 0;
+
+ /* no FMR => no need for page_vec */
+ kfree(ib_conn->fmr.page_vec);
+ ib_conn->fmr.page_vec = NULL;
+
+ ret = PTR_ERR(ib_conn->fmr.pool);
+ ib_conn->fmr.pool = NULL;
+ if (ret != -ENOSYS) {
+ iser_err("FMR allocation failed, err %d\n", ret);
+ return ret;
+ } else {
+ iser_warn("FMRs are not supported, using unaligned mode\n");
+ return 0;
+ }
+}
+
+/**
+ * iser_free_fmr_pool - releases the FMR pool and page vec
+ */
+void iser_free_fmr_pool(struct ib_conn *ib_conn)
+{
+ iser_info("freeing conn %p fmr pool %p\n",
+ ib_conn, ib_conn->fmr.pool);
+
+ if (ib_conn->fmr.pool != NULL)
+ ib_destroy_fmr_pool(ib_conn->fmr.pool);
+
+ ib_conn->fmr.pool = NULL;
+
+ kfree(ib_conn->fmr.page_vec);
+ ib_conn->fmr.page_vec = NULL;
+}
+
+static int
+iser_alloc_pi_ctx(struct ib_device *ib_device, struct ib_pd *pd,
+ struct fast_reg_descriptor *desc)
+{
+ struct iser_pi_context *pi_ctx = NULL;
+ struct ib_mr_init_attr mr_init_attr = {.max_reg_descriptors = 2,
+ .flags = IB_MR_SIGNATURE_EN};
+ int ret = 0;
+
+ desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
+ if (!desc->pi_ctx)
+ return -ENOMEM;
+
+ pi_ctx = desc->pi_ctx;
+
+ pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
+ ISCSI_ISER_SG_TABLESIZE);
+ if (IS_ERR(pi_ctx->prot_frpl)) {
+ ret = PTR_ERR(pi_ctx->prot_frpl);
+ goto prot_frpl_failure;
+ }
+
+ pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd,
+ ISCSI_ISER_SG_TABLESIZE + 1);
+ if (IS_ERR(pi_ctx->prot_mr)) {
+ ret = PTR_ERR(pi_ctx->prot_mr);
+ goto prot_mr_failure;
+ }
+ desc->reg_indicators |= ISER_PROT_KEY_VALID;
+
+ pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
+ if (IS_ERR(pi_ctx->sig_mr)) {
+ ret = PTR_ERR(pi_ctx->sig_mr);
+ goto sig_mr_failure;
+ }
+ desc->reg_indicators |= ISER_SIG_KEY_VALID;
+ desc->reg_indicators &= ~ISER_FASTREG_PROTECTED;
+
+ return 0;
+
+sig_mr_failure:
+ ib_dereg_mr(desc->pi_ctx->prot_mr);
+prot_mr_failure:
+ ib_free_fast_reg_page_list(desc->pi_ctx->prot_frpl);
+prot_frpl_failure:
+ kfree(desc->pi_ctx);
+
+ return ret;
+}
+
+static void
+iser_free_pi_ctx(struct iser_pi_context *pi_ctx)
+{
+ ib_free_fast_reg_page_list(pi_ctx->prot_frpl);
+ ib_dereg_mr(pi_ctx->prot_mr);
+ ib_destroy_mr(pi_ctx->sig_mr);
+ kfree(pi_ctx);
+}
+
+static int
+iser_create_fastreg_desc(struct ib_device *ib_device, struct ib_pd *pd,
+ bool pi_enable, struct fast_reg_descriptor *desc)
+{
+ int ret;
+
+ desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
+ ISCSI_ISER_SG_TABLESIZE + 1);
+ if (IS_ERR(desc->data_frpl)) {
+ ret = PTR_ERR(desc->data_frpl);
+ iser_err("Failed to allocate ib_fast_reg_page_list err=%d\n",
+ ret);
+ return PTR_ERR(desc->data_frpl);
+ }
+
+ desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE + 1);
+ if (IS_ERR(desc->data_mr)) {
+ ret = PTR_ERR(desc->data_mr);
+ iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret);
+ goto fast_reg_mr_failure;
+ }
+ desc->reg_indicators |= ISER_DATA_KEY_VALID;
+
+ if (pi_enable) {
+ ret = iser_alloc_pi_ctx(ib_device, pd, desc);
+ if (ret)
+ goto pi_ctx_alloc_failure;
+ }
+
+ return 0;
+pi_ctx_alloc_failure:
+ ib_dereg_mr(desc->data_mr);
+fast_reg_mr_failure:
+ ib_free_fast_reg_page_list(desc->data_frpl);
+
+ return ret;
+}
+
+/**
+ * iser_create_fastreg_pool - Creates pool of fast_reg descriptors
+ * for fast registration work requests.
+ * returns 0 on success, or errno code on failure
+ */
+int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max)
+{
+ struct iser_device *device = ib_conn->device;
+ struct fast_reg_descriptor *desc;
+ int i, ret;
+
+ INIT_LIST_HEAD(&ib_conn->fastreg.pool);
+ ib_conn->fastreg.pool_size = 0;
+ for (i = 0; i < cmds_max; i++) {
+ desc = kzalloc(sizeof(*desc), GFP_KERNEL);
+ if (!desc) {
+ iser_err("Failed to allocate a new fast_reg descriptor\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ ret = iser_create_fastreg_desc(device->ib_device, device->pd,
+ ib_conn->pi_support, desc);
+ if (ret) {
+ iser_err("Failed to create fastreg descriptor err=%d\n",
+ ret);
+ kfree(desc);
+ goto err;
+ }
+
+ list_add_tail(&desc->list, &ib_conn->fastreg.pool);
+ ib_conn->fastreg.pool_size++;
+ }
+
+ return 0;
+
+err:
+ iser_free_fastreg_pool(ib_conn);
+ return ret;
+}
+
+/**
+ * iser_free_fastreg_pool - releases the pool of fast_reg descriptors
+ */
+void iser_free_fastreg_pool(struct ib_conn *ib_conn)
+{
+ struct fast_reg_descriptor *desc, *tmp;
+ int i = 0;
+
+ if (list_empty(&ib_conn->fastreg.pool))
+ return;
+
+ iser_info("freeing conn %p fr pool\n", ib_conn);
+
+ list_for_each_entry_safe(desc, tmp, &ib_conn->fastreg.pool, list) {
+ list_del(&desc->list);
+ ib_free_fast_reg_page_list(desc->data_frpl);
+ ib_dereg_mr(desc->data_mr);
+ if (desc->pi_ctx)
+ iser_free_pi_ctx(desc->pi_ctx);
+ kfree(desc);
+ ++i;
+ }
+
+ if (i < ib_conn->fastreg.pool_size)
+ iser_warn("pool still has %d regions registered\n",
+ ib_conn->fastreg.pool_size - i);
+}
+
+/**
+ * iser_create_ib_conn_res - Queue-Pair (QP)
+ *
+ * returns 0 on success, -1 on failure
+ */
+static int iser_create_ib_conn_res(struct ib_conn *ib_conn)
+{
+ struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn,
+ ib_conn);
+ struct iser_device *device;
+ struct ib_device_attr *dev_attr;
+ struct ib_qp_init_attr init_attr;
+ int ret = -ENOMEM;
+ int index, min_index = 0;
+
+ BUG_ON(ib_conn->device == NULL);
+
+ device = ib_conn->device;
+ dev_attr = &device->dev_attr;
+
+ memset(&init_attr, 0, sizeof init_attr);
+
+ mutex_lock(&ig.connlist_mutex);
+ /* select the CQ with the minimal number of usages */
+ for (index = 0; index < device->comps_used; index++) {
+ if (device->comps[index].active_qps <
+ device->comps[min_index].active_qps)
+ min_index = index;
+ }
+ ib_conn->comp = &device->comps[min_index];
+ ib_conn->comp->active_qps++;
+ mutex_unlock(&ig.connlist_mutex);
+ iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn);
+
+ init_attr.event_handler = iser_qp_event_callback;
+ init_attr.qp_context = (void *)ib_conn;
+ init_attr.send_cq = ib_conn->comp->cq;
+ init_attr.recv_cq = ib_conn->comp->cq;
+ init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
+ init_attr.cap.max_send_sge = 2;
+ init_attr.cap.max_recv_sge = 1;
+ init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+ init_attr.qp_type = IB_QPT_RC;
+ if (ib_conn->pi_support) {
+ init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1;
+ init_attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
+ iser_conn->max_cmds =
+ ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS);
+ } else {
+ if (dev_attr->max_qp_wr > ISER_QP_MAX_REQ_DTOS) {
+ init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS + 1;
+ iser_conn->max_cmds =
+ ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS);
+ } else {
+ init_attr.cap.max_send_wr = dev_attr->max_qp_wr;
+ iser_conn->max_cmds =
+ ISER_GET_MAX_XMIT_CMDS(dev_attr->max_qp_wr);
+ iser_dbg("device %s supports max_send_wr %d\n",
+ device->ib_device->name, dev_attr->max_qp_wr);
+ }
+ }
+
+ ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
+ if (ret)
+ goto out_err;
+
+ ib_conn->qp = ib_conn->cma_id->qp;
+ iser_info("setting conn %p cma_id %p qp %p\n",
+ ib_conn, ib_conn->cma_id,
+ ib_conn->cma_id->qp);
+ return ret;
+
+out_err:
+ mutex_lock(&ig.connlist_mutex);
+ ib_conn->comp->active_qps--;
+ mutex_unlock(&ig.connlist_mutex);
+ iser_err("unable to alloc mem or create resource, err %d\n", ret);
+
+ return ret;
+}
+
+/**
+ * based on the resolved device node GUID see if there already allocated
+ * device for this device. If there's no such, create one.
+ */
+static
+struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
+{
+ struct iser_device *device;
+
+ mutex_lock(&ig.device_list_mutex);
+
+ list_for_each_entry(device, &ig.device_list, ig_list)
+ /* find if there's a match using the node GUID */
+ if (device->ib_device->node_guid == cma_id->device->node_guid)
+ goto inc_refcnt;
+
+ device = kzalloc(sizeof *device, GFP_KERNEL);
+ if (device == NULL)
+ goto out;
+
+ /* assign this device to the device */
+ device->ib_device = cma_id->device;
+ /* init the device and link it into ig device list */
+ if (iser_create_device_ib_res(device)) {
+ kfree(device);
+ device = NULL;
+ goto out;
+ }
+ list_add(&device->ig_list, &ig.device_list);
+
+inc_refcnt:
+ device->refcount++;
+out:
+ mutex_unlock(&ig.device_list_mutex);
+ return device;
+}
+
+/* if there's no demand for this device, release it */
+static void iser_device_try_release(struct iser_device *device)
+{
+ mutex_lock(&ig.device_list_mutex);
+ device->refcount--;
+ iser_info("device %p refcount %d\n", device, device->refcount);
+ if (!device->refcount) {
+ iser_free_device_ib_res(device);
+ list_del(&device->ig_list);
+ kfree(device);
+ }
+ mutex_unlock(&ig.device_list_mutex);
+}
+
+/**
+ * Called with state mutex held
+ **/
+static int iser_conn_state_comp_exch(struct iser_conn *iser_conn,
+ enum iser_conn_state comp,
+ enum iser_conn_state exch)
+{
+ int ret;
+
+ ret = (iser_conn->state == comp);
+ if (ret)
+ iser_conn->state = exch;
+
+ return ret;
+}
+
+void iser_release_work(struct work_struct *work)
+{
+ struct iser_conn *iser_conn;
+
+ iser_conn = container_of(work, struct iser_conn, release_work);
+
+ /* Wait for conn_stop to complete */
+ wait_for_completion(&iser_conn->stop_completion);
+ /* Wait for IB resouces cleanup to complete */
+ wait_for_completion(&iser_conn->ib_completion);
+
+ mutex_lock(&iser_conn->state_mutex);
+ iser_conn->state = ISER_CONN_DOWN;
+ mutex_unlock(&iser_conn->state_mutex);
+
+ iser_conn_release(iser_conn);
+}
+
+/**
+ * iser_free_ib_conn_res - release IB related resources
+ * @iser_conn: iser connection struct
+ * @destroy: indicator if we need to try to release the
+ * iser device and memory regoins pool (only iscsi
+ * shutdown and DEVICE_REMOVAL will use this).
+ *
+ * This routine is called with the iser state mutex held
+ * so the cm_id removal is out of here. It is Safe to
+ * be invoked multiple times.
+ */
+static void iser_free_ib_conn_res(struct iser_conn *iser_conn,
+ bool destroy)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+
+ iser_info("freeing conn %p cma_id %p qp %p\n",
+ iser_conn, ib_conn->cma_id, ib_conn->qp);
+
+ if (ib_conn->qp != NULL) {
+ ib_conn->comp->active_qps--;
+ rdma_destroy_qp(ib_conn->cma_id);
+ ib_conn->qp = NULL;
+ }
+
+ if (destroy) {
+ if (iser_conn->rx_descs)
+ iser_free_rx_descriptors(iser_conn);
+
+ if (device != NULL) {
+ iser_device_try_release(device);
+ ib_conn->device = NULL;
+ }
+ }
+}
+
+/**
+ * Frees all conn objects and deallocs conn descriptor
+ */
+void iser_conn_release(struct iser_conn *iser_conn)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+
+ mutex_lock(&ig.connlist_mutex);
+ list_del(&iser_conn->conn_list);
+ mutex_unlock(&ig.connlist_mutex);
+
+ mutex_lock(&iser_conn->state_mutex);
+ /* In case we endup here without ep_disconnect being invoked. */
+ if (iser_conn->state != ISER_CONN_DOWN) {
+ iser_warn("iser conn %p state %d, expected state down.\n",
+ iser_conn, iser_conn->state);
+ iscsi_destroy_endpoint(iser_conn->ep);
+ iser_conn->state = ISER_CONN_DOWN;
+ }
+ /*
+ * In case we never got to bind stage, we still need to
+ * release IB resources (which is safe to call more than once).
+ */
+ iser_free_ib_conn_res(iser_conn, true);
+ mutex_unlock(&iser_conn->state_mutex);
+
+ if (ib_conn->cma_id != NULL) {
+ rdma_destroy_id(ib_conn->cma_id);
+ ib_conn->cma_id = NULL;
+ }
+
+ kfree(iser_conn);
+}
+
+/**
+ * triggers start of the disconnect procedures and wait for them to be done
+ * Called with state mutex held
+ */
+int iser_conn_terminate(struct iser_conn *iser_conn)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct ib_send_wr *bad_wr;
+ int err = 0;
+
+ /* terminate the iser conn only if the conn state is UP */
+ if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP,
+ ISER_CONN_TERMINATING))
+ return 0;
+
+ iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state);
+
+ /* suspend queuing of new iscsi commands */
+ if (iser_conn->iscsi_conn)
+ iscsi_suspend_queue(iser_conn->iscsi_conn);
+
+ /*
+ * In case we didn't already clean up the cma_id (peer initiated
+ * a disconnection), we need to Cause the CMA to change the QP
+ * state to ERROR.
+ */
+ if (ib_conn->cma_id) {
+ err = rdma_disconnect(ib_conn->cma_id);
+ if (err)
+ iser_err("Failed to disconnect, conn: 0x%p err %d\n",
+ iser_conn, err);
+
+ /* post an indication that all flush errors were consumed */
+ err = ib_post_send(ib_conn->qp, &ib_conn->beacon, &bad_wr);
+ if (err) {
+ iser_err("conn %p failed to post beacon", ib_conn);
+ return 1;
+ }
+
+ wait_for_completion(&ib_conn->flush_comp);
+ }
+
+ return 1;
+}
+
+/**
+ * Called with state mutex held
+ **/
+static void iser_connect_error(struct rdma_cm_id *cma_id)
+{
+ struct iser_conn *iser_conn;
+
+ iser_conn = (struct iser_conn *)cma_id->context;
+ iser_conn->state = ISER_CONN_TERMINATING;
+}
+
+/**
+ * Called with state mutex held
+ **/
+static void iser_addr_handler(struct rdma_cm_id *cma_id)
+{
+ struct iser_device *device;
+ struct iser_conn *iser_conn;
+ struct ib_conn *ib_conn;
+ int ret;
+
+ iser_conn = (struct iser_conn *)cma_id->context;
+ if (iser_conn->state != ISER_CONN_PENDING)
+ /* bailout */
+ return;
+
+ ib_conn = &iser_conn->ib_conn;
+ device = iser_device_find_by_ib_device(cma_id);
+ if (!device) {
+ iser_err("device lookup/creation failed\n");
+ iser_connect_error(cma_id);
+ return;
+ }
+
+ ib_conn->device = device;
+
+ /* connection T10-PI support */
+ if (iser_pi_enable) {
+ if (!(device->dev_attr.device_cap_flags &
+ IB_DEVICE_SIGNATURE_HANDOVER)) {
+ iser_warn("T10-PI requested but not supported on %s, "
+ "continue without T10-PI\n",
+ ib_conn->device->ib_device->name);
+ ib_conn->pi_support = false;
+ } else {
+ ib_conn->pi_support = true;
+ }
+ }
+
+ ret = rdma_resolve_route(cma_id, 1000);
+ if (ret) {
+ iser_err("resolve route failed: %d\n", ret);
+ iser_connect_error(cma_id);
+ return;
+ }
+}
+
+/**
+ * Called with state mutex held
+ **/
+static void iser_route_handler(struct rdma_cm_id *cma_id)
+{
+ struct rdma_conn_param conn_param;
+ int ret;
+ struct iser_cm_hdr req_hdr;
+ struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct iser_device *device = ib_conn->device;
+
+ if (iser_conn->state != ISER_CONN_PENDING)
+ /* bailout */
+ return;
+
+ ret = iser_create_ib_conn_res(ib_conn);
+ if (ret)
+ goto failure;
+
+ memset(&conn_param, 0, sizeof conn_param);
+ conn_param.responder_resources = device->dev_attr.max_qp_rd_atom;
+ conn_param.initiator_depth = 1;
+ conn_param.retry_count = 7;
+ conn_param.rnr_retry_count = 6;
+
+ memset(&req_hdr, 0, sizeof(req_hdr));
+ req_hdr.flags = (ISER_ZBVA_NOT_SUPPORTED |
+ ISER_SEND_W_INV_NOT_SUPPORTED);
+ conn_param.private_data = (void *)&req_hdr;
+ conn_param.private_data_len = sizeof(struct iser_cm_hdr);
+
+ ret = rdma_connect(cma_id, &conn_param);
+ if (ret) {
+ iser_err("failure connecting: %d\n", ret);
+ goto failure;
+ }
+
+ return;
+failure:
+ iser_connect_error(cma_id);
+}
+
+static void iser_connected_handler(struct rdma_cm_id *cma_id)
+{
+ struct iser_conn *iser_conn;
+ struct ib_qp_attr attr;
+ struct ib_qp_init_attr init_attr;
+
+ iser_conn = (struct iser_conn *)cma_id->context;
+ if (iser_conn->state != ISER_CONN_PENDING)
+ /* bailout */
+ return;
+
+ (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr);
+ iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num);
+
+ iser_conn->state = ISER_CONN_UP;
+ complete(&iser_conn->up_completion);
+}
+
+static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
+{
+ struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
+
+ if (iser_conn_terminate(iser_conn)) {
+ if (iser_conn->iscsi_conn)
+ iscsi_conn_failure(iser_conn->iscsi_conn,
+ ISCSI_ERR_CONN_FAILED);
+ else
+ iser_err("iscsi_iser connection isn't bound\n");
+ }
+}
+
+static void iser_cleanup_handler(struct rdma_cm_id *cma_id,
+ bool destroy)
+{
+ struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
+
+ /*
+ * We are not guaranteed that we visited disconnected_handler
+ * by now, call it here to be safe that we handle CM drep
+ * and flush errors.
+ */
+ iser_disconnected_handler(cma_id);
+ iser_free_ib_conn_res(iser_conn, destroy);
+ complete(&iser_conn->ib_completion);
+};
+
+static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
+{
+ struct iser_conn *iser_conn;
+ int ret = 0;
+
+ iser_conn = (struct iser_conn *)cma_id->context;
+ iser_info("event %d status %d conn %p id %p\n",
+ event->event, event->status, cma_id->context, cma_id);
+
+ mutex_lock(&iser_conn->state_mutex);
+ switch (event->event) {
+ case RDMA_CM_EVENT_ADDR_RESOLVED:
+ iser_addr_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_ROUTE_RESOLVED:
+ iser_route_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_ESTABLISHED:
+ iser_connected_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_ADDR_ERROR:
+ case RDMA_CM_EVENT_ROUTE_ERROR:
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ case RDMA_CM_EVENT_UNREACHABLE:
+ case RDMA_CM_EVENT_REJECTED:
+ iser_connect_error(cma_id);
+ break;
+ case RDMA_CM_EVENT_DISCONNECTED:
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ case RDMA_CM_EVENT_TIMEWAIT_EXIT:
+ iser_cleanup_handler(cma_id, false);
+ break;
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ /*
+ * we *must* destroy the device as we cannot rely
+ * on iscsid to be around to initiate error handling.
+ * also if we are not in state DOWN implicitly destroy
+ * the cma_id.
+ */
+ iser_cleanup_handler(cma_id, true);
+ if (iser_conn->state != ISER_CONN_DOWN) {
+ iser_conn->ib_conn.cma_id = NULL;
+ ret = 1;
+ }
+ break;
+ default:
+ iser_err("Unexpected RDMA CM event (%d)\n", event->event);
+ break;
+ }
+ mutex_unlock(&iser_conn->state_mutex);
+
+ return ret;
+}
+
+void iser_conn_init(struct iser_conn *iser_conn)
+{
+ iser_conn->state = ISER_CONN_INIT;
+ iser_conn->ib_conn.post_recv_buf_count = 0;
+ init_completion(&iser_conn->ib_conn.flush_comp);
+ init_completion(&iser_conn->stop_completion);
+ init_completion(&iser_conn->ib_completion);
+ init_completion(&iser_conn->up_completion);
+ INIT_LIST_HEAD(&iser_conn->conn_list);
+ spin_lock_init(&iser_conn->ib_conn.lock);
+ mutex_init(&iser_conn->state_mutex);
+}
+
+ /**
+ * starts the process of connecting to the target
+ * sleeps until the connection is established or rejected
+ */
+int iser_connect(struct iser_conn *iser_conn,
+ struct sockaddr *src_addr,
+ struct sockaddr *dst_addr,
+ int non_blocking)
+{
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ int err = 0;
+
+ mutex_lock(&iser_conn->state_mutex);
+
+ sprintf(iser_conn->name, "%pISp", dst_addr);
+
+ iser_info("connecting to: %s\n", iser_conn->name);
+
+ /* the device is known only --after-- address resolution */
+ ib_conn->device = NULL;
+
+ iser_conn->state = ISER_CONN_PENDING;
+
+ ib_conn->beacon.wr_id = ISER_BEACON_WRID;
+ ib_conn->beacon.opcode = IB_WR_SEND;
+
+ ib_conn->cma_id = rdma_create_id(iser_cma_handler,
+ (void *)iser_conn,
+ RDMA_PS_TCP, IB_QPT_RC);
+ if (IS_ERR(ib_conn->cma_id)) {
+ err = PTR_ERR(ib_conn->cma_id);
+ iser_err("rdma_create_id failed: %d\n", err);
+ goto id_failure;
+ }
+
+ err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000);
+ if (err) {
+ iser_err("rdma_resolve_addr failed: %d\n", err);
+ goto addr_failure;
+ }
+
+ if (!non_blocking) {
+ wait_for_completion_interruptible(&iser_conn->up_completion);
+
+ if (iser_conn->state != ISER_CONN_UP) {
+ err = -EIO;
+ goto connect_failure;
+ }
+ }
+ mutex_unlock(&iser_conn->state_mutex);
+
+ mutex_lock(&ig.connlist_mutex);
+ list_add(&iser_conn->conn_list, &ig.connlist);
+ mutex_unlock(&ig.connlist_mutex);
+ return 0;
+
+id_failure:
+ ib_conn->cma_id = NULL;
+addr_failure:
+ iser_conn->state = ISER_CONN_DOWN;
+connect_failure:
+ mutex_unlock(&iser_conn->state_mutex);
+ iser_conn_release(iser_conn);
+ return err;
+}
+
+int iser_post_recvl(struct iser_conn *iser_conn)
+{
+ struct ib_recv_wr rx_wr, *rx_wr_failed;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ struct ib_sge sge;
+ int ib_ret;
+
+ sge.addr = iser_conn->login_resp_dma;
+ sge.length = ISER_RX_LOGIN_SIZE;
+ sge.lkey = ib_conn->device->mr->lkey;
+
+ rx_wr.wr_id = (uintptr_t)iser_conn->login_resp_buf;
+ rx_wr.sg_list = &sge;
+ rx_wr.num_sge = 1;
+ rx_wr.next = NULL;
+
+ ib_conn->post_recv_buf_count++;
+ ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed);
+ if (ib_ret) {
+ iser_err("ib_post_recv failed ret=%d\n", ib_ret);
+ ib_conn->post_recv_buf_count--;
+ }
+ return ib_ret;
+}
+
+int iser_post_recvm(struct iser_conn *iser_conn, int count)
+{
+ struct ib_recv_wr *rx_wr, *rx_wr_failed;
+ int i, ib_ret;
+ struct ib_conn *ib_conn = &iser_conn->ib_conn;
+ unsigned int my_rx_head = iser_conn->rx_desc_head;
+ struct iser_rx_desc *rx_desc;
+
+ for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
+ rx_desc = &iser_conn->rx_descs[my_rx_head];
+ rx_wr->wr_id = (uintptr_t)rx_desc;
+ rx_wr->sg_list = &rx_desc->rx_sg;
+ rx_wr->num_sge = 1;
+ rx_wr->next = rx_wr + 1;
+ my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask;
+ }
+
+ rx_wr--;
+ rx_wr->next = NULL; /* mark end of work requests list */
+
+ ib_conn->post_recv_buf_count += count;
+ ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed);
+ if (ib_ret) {
+ iser_err("ib_post_recv failed ret=%d\n", ib_ret);
+ ib_conn->post_recv_buf_count -= count;
+ } else
+ iser_conn->rx_desc_head = my_rx_head;
+ return ib_ret;
+}
+
+
+/**
+ * iser_start_send - Initiate a Send DTO operation
+ *
+ * returns 0 on success, -1 on failure
+ */
+int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
+ bool signal)
+{
+ int ib_ret;
+ struct ib_send_wr send_wr, *send_wr_failed;
+
+ ib_dma_sync_single_for_device(ib_conn->device->ib_device,
+ tx_desc->dma_addr, ISER_HEADERS_LEN,
+ DMA_TO_DEVICE);
+
+ send_wr.next = NULL;
+ send_wr.wr_id = (uintptr_t)tx_desc;
+ send_wr.sg_list = tx_desc->tx_sg;
+ send_wr.num_sge = tx_desc->num_sge;
+ send_wr.opcode = IB_WR_SEND;
+ send_wr.send_flags = signal ? IB_SEND_SIGNALED : 0;
+
+ ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
+ if (ib_ret)
+ iser_err("ib_post_send failed, ret:%d\n", ib_ret);
+
+ return ib_ret;
+}
+
+/**
+ * is_iser_tx_desc - Indicate if the completion wr_id
+ * is a TX descriptor or not.
+ * @iser_conn: iser connection
+ * @wr_id: completion WR identifier
+ *
+ * Since we cannot rely on wc opcode in FLUSH errors
+ * we must work around it by checking if the wr_id address
+ * falls in the iser connection rx_descs buffer. If so
+ * it is an RX descriptor, otherwize it is a TX.
+ */
+static inline bool
+is_iser_tx_desc(struct iser_conn *iser_conn, void *wr_id)
+{
+ void *start = iser_conn->rx_descs;
+ int len = iser_conn->num_rx_descs * sizeof(*iser_conn->rx_descs);
+
+ if (wr_id >= start && wr_id < start + len)
+ return false;
+
+ return true;
+}
+
+/**
+ * iser_handle_comp_error() - Handle error completion
+ * @ib_conn: connection RDMA resources
+ * @wc: work completion
+ *
+ * Notes: We may handle a FLUSH error completion and in this case
+ * we only cleanup in case TX type was DATAOUT. For non-FLUSH
+ * error completion we should also notify iscsi layer that
+ * connection is failed (in case we passed bind stage).
+ */
+static void
+iser_handle_comp_error(struct ib_conn *ib_conn,
+ struct ib_wc *wc)
+{
+ void *wr_id = (void *)(uintptr_t)wc->wr_id;
+ struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn,
+ ib_conn);
+
+ if (wc->status != IB_WC_WR_FLUSH_ERR)
+ if (iser_conn->iscsi_conn)
+ iscsi_conn_failure(iser_conn->iscsi_conn,
+ ISCSI_ERR_CONN_FAILED);
+
+ if (wc->wr_id == ISER_FASTREG_LI_WRID)
+ return;
+
+ if (is_iser_tx_desc(iser_conn, wr_id)) {
+ struct iser_tx_desc *desc = wr_id;
+
+ if (desc->type == ISCSI_TX_DATAOUT)
+ kmem_cache_free(ig.desc_cache, desc);
+ } else {
+ ib_conn->post_recv_buf_count--;
+ }
+}
+
+/**
+ * iser_handle_wc - handle a single work completion
+ * @wc: work completion
+ *
+ * Soft-IRQ context, work completion can be either
+ * SEND or RECV, and can turn out successful or
+ * with error (or flush error).
+ */
+static void iser_handle_wc(struct ib_wc *wc)
+{
+ struct ib_conn *ib_conn;
+ struct iser_tx_desc *tx_desc;
+ struct iser_rx_desc *rx_desc;
+
+ ib_conn = wc->qp->qp_context;
+ if (likely(wc->status == IB_WC_SUCCESS)) {
+ if (wc->opcode == IB_WC_RECV) {
+ rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
+ iser_rcv_completion(rx_desc, wc->byte_len,
+ ib_conn);
+ } else
+ if (wc->opcode == IB_WC_SEND) {
+ tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
+ iser_snd_completion(tx_desc, ib_conn);
+ } else {
+ iser_err("Unknown wc opcode %d\n", wc->opcode);
+ }
+ } else {
+ if (wc->status != IB_WC_WR_FLUSH_ERR)
+ iser_err("wr id %llx status %d vend_err %x\n",
+ wc->wr_id, wc->status, wc->vendor_err);
+ else
+ iser_dbg("flush error: wr id %llx\n", wc->wr_id);
+
+ if (wc->wr_id == ISER_BEACON_WRID)
+ /* all flush errors were consumed */
+ complete(&ib_conn->flush_comp);
+ else
+ iser_handle_comp_error(ib_conn, wc);
+ }
+}
+
+/**
+ * iser_cq_tasklet_fn - iSER completion polling loop
+ * @data: iSER completion context
+ *
+ * Soft-IRQ context, polling connection CQ until
+ * either CQ was empty or we exausted polling budget
+ */
+static void iser_cq_tasklet_fn(unsigned long data)
+{
+ struct iser_comp *comp = (struct iser_comp *)data;
+ struct ib_cq *cq = comp->cq;
+ struct ib_wc *const wcs = comp->wcs;
+ int i, n, completed = 0;
+
+ while ((n = ib_poll_cq(cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
+ for (i = 0; i < n; i++)
+ iser_handle_wc(&wcs[i]);
+
+ completed += n;
+ if (completed >= iser_cq_poll_limit)
+ break;
+ }
+
+ /*
+ * It is assumed here that arming CQ only once its empty
+ * would not cause interrupts to be missed.
+ */
+ ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
+
+ iser_dbg("got %d completions\n", completed);
+}
+
+static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
+{
+ struct iser_comp *comp = cq_context;
+
+ tasklet_schedule(&comp->tasklet);
+}
+
+u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir, sector_t *sector)
+{
+ struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
+ struct fast_reg_descriptor *desc = reg->mem_h;
+ unsigned long sector_size = iser_task->sc->device->sector_size;
+ struct ib_mr_status mr_status;
+ int ret;
+
+ if (desc && desc->reg_indicators & ISER_FASTREG_PROTECTED) {
+ desc->reg_indicators &= ~ISER_FASTREG_PROTECTED;
+ ret = ib_check_mr_status(desc->pi_ctx->sig_mr,
+ IB_MR_CHECK_SIG_STATUS, &mr_status);
+ if (ret) {
+ pr_err("ib_check_mr_status failed, ret %d\n", ret);
+ goto err;
+ }
+
+ if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
+ sector_t sector_off = mr_status.sig_err.sig_err_offset;
+
+ do_div(sector_off, sector_size + 8);
+ *sector = scsi_get_lba(iser_task->sc) + sector_off;
+
+ pr_err("PI error found type %d at sector %llx "
+ "expected %x vs actual %x\n",
+ mr_status.sig_err.err_type,
+ (unsigned long long)*sector,
+ mr_status.sig_err.expected,
+ mr_status.sig_err.actual);
+
+ switch (mr_status.sig_err.err_type) {
+ case IB_SIG_BAD_GUARD:
+ return 0x1;
+ case IB_SIG_BAD_REFTAG:
+ return 0x3;
+ case IB_SIG_BAD_APPTAG:
+ return 0x2;
+ }
+ }
+ }
+
+ return 0;
+err:
+ /* Not alot we can do here, return ambiguous guard error */
+ return 0x1;
+}