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Diffstat (limited to 'kernel/drivers/target/tcm_fc/tfc_conf.c')
-rw-r--r--kernel/drivers/target/tcm_fc/tfc_conf.c601
1 files changed, 601 insertions, 0 deletions
diff --git a/kernel/drivers/target/tcm_fc/tfc_conf.c b/kernel/drivers/target/tcm_fc/tfc_conf.c
new file mode 100644
index 000000000..65dce1345
--- /dev/null
+++ b/kernel/drivers/target/tcm_fc/tfc_conf.c
@@ -0,0 +1,601 @@
+/*******************************************************************************
+ * Filename: tcm_fc.c
+ *
+ * This file contains the configfs implementation for TCM_fc fabric node.
+ * Based on tcm_loop_configfs.c
+ *
+ * Copyright (c) 2010 Cisco Systems, Inc.
+ * Copyright (c) 2009,2010 Rising Tide, Inc.
+ * Copyright (c) 2009,2010 Linux-iSCSI.org
+ *
+ * Copyright (c) 2009,2010 Nicholas A. Bellinger <nab@linux-iscsi.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ ****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <generated/utsrelease.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/configfs.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <asm/unaligned.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/libfc.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+#include <target/target_core_fabric_configfs.h>
+#include <target/target_core_configfs.h>
+#include <target/configfs_macros.h>
+
+#include "tcm_fc.h"
+
+static const struct target_core_fabric_ops ft_fabric_ops;
+
+static LIST_HEAD(ft_wwn_list);
+DEFINE_MUTEX(ft_lport_lock);
+
+unsigned int ft_debug_logging;
+module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
+
+/*
+ * Parse WWN.
+ * If strict, we require lower-case hex and colon separators to be sure
+ * the name is the same as what would be generated by ft_format_wwn()
+ * so the name and wwn are mapped one-to-one.
+ */
+static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict)
+{
+ const char *cp;
+ char c;
+ u32 byte = 0;
+ u32 pos = 0;
+ u32 err;
+ int val;
+
+ *wwn = 0;
+ for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) {
+ c = *cp;
+ if (c == '\n' && cp[1] == '\0')
+ continue;
+ if (strict && pos++ == 2 && byte++ < 7) {
+ pos = 0;
+ if (c == ':')
+ continue;
+ err = 1;
+ goto fail;
+ }
+ if (c == '\0') {
+ err = 2;
+ if (strict && byte != 8)
+ goto fail;
+ return cp - name;
+ }
+ err = 3;
+ val = hex_to_bin(c);
+ if (val < 0 || (strict && isupper(c)))
+ goto fail;
+ *wwn = (*wwn << 4) | val;
+ }
+ err = 4;
+fail:
+ pr_debug("err %u len %zu pos %u byte %u\n",
+ err, cp - name, pos, byte);
+ return -1;
+}
+
+ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn)
+{
+ u8 b[8];
+
+ put_unaligned_be64(wwn, b);
+ return snprintf(buf, len,
+ "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
+ b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
+}
+
+static ssize_t ft_wwn_show(void *arg, char *buf)
+{
+ u64 *wwn = arg;
+ ssize_t len;
+
+ len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn);
+ buf[len++] = '\n';
+ return len;
+}
+
+static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len)
+{
+ ssize_t ret;
+ u64 wwn;
+
+ ret = ft_parse_wwn(buf, &wwn, 0);
+ if (ret > 0)
+ *(u64 *)arg = wwn;
+ return ret;
+}
+
+/*
+ * ACL auth ops.
+ */
+
+static ssize_t ft_nacl_show_port_name(
+ struct se_node_acl *se_nacl,
+ char *page)
+{
+ struct ft_node_acl *acl = container_of(se_nacl,
+ struct ft_node_acl, se_node_acl);
+
+ return ft_wwn_show(&acl->node_auth.port_name, page);
+}
+
+static ssize_t ft_nacl_store_port_name(
+ struct se_node_acl *se_nacl,
+ const char *page,
+ size_t count)
+{
+ struct ft_node_acl *acl = container_of(se_nacl,
+ struct ft_node_acl, se_node_acl);
+
+ return ft_wwn_store(&acl->node_auth.port_name, page, count);
+}
+
+TF_NACL_BASE_ATTR(ft, port_name, S_IRUGO | S_IWUSR);
+
+static ssize_t ft_nacl_show_node_name(
+ struct se_node_acl *se_nacl,
+ char *page)
+{
+ struct ft_node_acl *acl = container_of(se_nacl,
+ struct ft_node_acl, se_node_acl);
+
+ return ft_wwn_show(&acl->node_auth.node_name, page);
+}
+
+static ssize_t ft_nacl_store_node_name(
+ struct se_node_acl *se_nacl,
+ const char *page,
+ size_t count)
+{
+ struct ft_node_acl *acl = container_of(se_nacl,
+ struct ft_node_acl, se_node_acl);
+
+ return ft_wwn_store(&acl->node_auth.node_name, page, count);
+}
+
+TF_NACL_BASE_ATTR(ft, node_name, S_IRUGO | S_IWUSR);
+
+static struct configfs_attribute *ft_nacl_base_attrs[] = {
+ &ft_nacl_port_name.attr,
+ &ft_nacl_node_name.attr,
+ NULL,
+};
+
+/*
+ * ACL ops.
+ */
+
+/*
+ * Add ACL for an initiator. The ACL is named arbitrarily.
+ * The port_name and/or node_name are attributes.
+ */
+static struct se_node_acl *ft_add_acl(
+ struct se_portal_group *se_tpg,
+ struct config_group *group,
+ const char *name)
+{
+ struct ft_node_acl *acl;
+ struct ft_tpg *tpg;
+ u64 wwpn;
+ u32 q_depth;
+
+ pr_debug("add acl %s\n", name);
+ tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
+
+ if (ft_parse_wwn(name, &wwpn, 1) < 0)
+ return ERR_PTR(-EINVAL);
+
+ acl = kzalloc(sizeof(struct ft_node_acl), GFP_KERNEL);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+ acl->node_auth.port_name = wwpn;
+
+ q_depth = 32; /* XXX bogus default - get from tpg? */
+ return core_tpg_add_initiator_node_acl(&tpg->se_tpg,
+ &acl->se_node_acl, name, q_depth);
+}
+
+static void ft_del_acl(struct se_node_acl *se_acl)
+{
+ struct se_portal_group *se_tpg = se_acl->se_tpg;
+ struct ft_tpg *tpg;
+ struct ft_node_acl *acl = container_of(se_acl,
+ struct ft_node_acl, se_node_acl);
+
+ pr_debug("del acl %s\n",
+ config_item_name(&se_acl->acl_group.cg_item));
+
+ tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
+ pr_debug("del acl %p se_acl %p tpg %p se_tpg %p\n",
+ acl, se_acl, tpg, &tpg->se_tpg);
+
+ core_tpg_del_initiator_node_acl(&tpg->se_tpg, se_acl, 1);
+ kfree(acl);
+}
+
+struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata)
+{
+ struct ft_node_acl *found = NULL;
+ struct ft_node_acl *acl;
+ struct se_portal_group *se_tpg = &tpg->se_tpg;
+ struct se_node_acl *se_acl;
+
+ spin_lock_irq(&se_tpg->acl_node_lock);
+ list_for_each_entry(se_acl, &se_tpg->acl_node_list, acl_list) {
+ acl = container_of(se_acl, struct ft_node_acl, se_node_acl);
+ pr_debug("acl %p port_name %llx\n",
+ acl, (unsigned long long)acl->node_auth.port_name);
+ if (acl->node_auth.port_name == rdata->ids.port_name ||
+ acl->node_auth.node_name == rdata->ids.node_name) {
+ pr_debug("acl %p port_name %llx matched\n", acl,
+ (unsigned long long)rdata->ids.port_name);
+ found = acl;
+ /* XXX need to hold onto ACL */
+ break;
+ }
+ }
+ spin_unlock_irq(&se_tpg->acl_node_lock);
+ return found;
+}
+
+static struct se_node_acl *ft_tpg_alloc_fabric_acl(struct se_portal_group *se_tpg)
+{
+ struct ft_node_acl *acl;
+
+ acl = kzalloc(sizeof(*acl), GFP_KERNEL);
+ if (!acl) {
+ pr_err("Unable to allocate struct ft_node_acl\n");
+ return NULL;
+ }
+ pr_debug("acl %p\n", acl);
+ return &acl->se_node_acl;
+}
+
+static void ft_tpg_release_fabric_acl(struct se_portal_group *se_tpg,
+ struct se_node_acl *se_acl)
+{
+ struct ft_node_acl *acl = container_of(se_acl,
+ struct ft_node_acl, se_node_acl);
+
+ pr_debug("acl %p\n", acl);
+ kfree(acl);
+}
+
+/*
+ * local_port port_group (tpg) ops.
+ */
+static struct se_portal_group *ft_add_tpg(
+ struct se_wwn *wwn,
+ struct config_group *group,
+ const char *name)
+{
+ struct ft_lport_wwn *ft_wwn;
+ struct ft_tpg *tpg;
+ struct workqueue_struct *wq;
+ unsigned long index;
+ int ret;
+
+ pr_debug("tcm_fc: add tpg %s\n", name);
+
+ /*
+ * Name must be "tpgt_" followed by the index.
+ */
+ if (strstr(name, "tpgt_") != name)
+ return NULL;
+
+ ret = kstrtoul(name + 5, 10, &index);
+ if (ret)
+ return NULL;
+ if (index > UINT_MAX)
+ return NULL;
+
+ if ((index != 1)) {
+ pr_err("Error, a single TPG=1 is used for HW port mappings\n");
+ return ERR_PTR(-ENOSYS);
+ }
+
+ ft_wwn = container_of(wwn, struct ft_lport_wwn, se_wwn);
+ tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
+ if (!tpg)
+ return NULL;
+ tpg->index = index;
+ tpg->lport_wwn = ft_wwn;
+ INIT_LIST_HEAD(&tpg->lun_list);
+
+ wq = alloc_workqueue("tcm_fc", 0, 1);
+ if (!wq) {
+ kfree(tpg);
+ return NULL;
+ }
+
+ ret = core_tpg_register(&ft_fabric_ops, wwn, &tpg->se_tpg,
+ tpg, TRANSPORT_TPG_TYPE_NORMAL);
+ if (ret < 0) {
+ destroy_workqueue(wq);
+ kfree(tpg);
+ return NULL;
+ }
+ tpg->workqueue = wq;
+
+ mutex_lock(&ft_lport_lock);
+ ft_wwn->tpg = tpg;
+ mutex_unlock(&ft_lport_lock);
+
+ return &tpg->se_tpg;
+}
+
+static void ft_del_tpg(struct se_portal_group *se_tpg)
+{
+ struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
+ struct ft_lport_wwn *ft_wwn = tpg->lport_wwn;
+
+ pr_debug("del tpg %s\n",
+ config_item_name(&tpg->se_tpg.tpg_group.cg_item));
+
+ destroy_workqueue(tpg->workqueue);
+
+ /* Wait for sessions to be freed thru RCU, for BUG_ON below */
+ synchronize_rcu();
+
+ mutex_lock(&ft_lport_lock);
+ ft_wwn->tpg = NULL;
+ if (tpg->tport) {
+ tpg->tport->tpg = NULL;
+ tpg->tport = NULL;
+ }
+ mutex_unlock(&ft_lport_lock);
+
+ core_tpg_deregister(se_tpg);
+ kfree(tpg);
+}
+
+/*
+ * Verify that an lport is configured to use the tcm_fc module, and return
+ * the target port group that should be used.
+ *
+ * The caller holds ft_lport_lock.
+ */
+struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport)
+{
+ struct ft_lport_wwn *ft_wwn;
+
+ list_for_each_entry(ft_wwn, &ft_wwn_list, ft_wwn_node) {
+ if (ft_wwn->wwpn == lport->wwpn)
+ return ft_wwn->tpg;
+ }
+ return NULL;
+}
+
+/*
+ * target config instance ops.
+ */
+
+/*
+ * Add lport to allowed config.
+ * The name is the WWPN in lower-case ASCII, colon-separated bytes.
+ */
+static struct se_wwn *ft_add_wwn(
+ struct target_fabric_configfs *tf,
+ struct config_group *group,
+ const char *name)
+{
+ struct ft_lport_wwn *ft_wwn;
+ struct ft_lport_wwn *old_ft_wwn;
+ u64 wwpn;
+
+ pr_debug("add wwn %s\n", name);
+ if (ft_parse_wwn(name, &wwpn, 1) < 0)
+ return NULL;
+ ft_wwn = kzalloc(sizeof(*ft_wwn), GFP_KERNEL);
+ if (!ft_wwn)
+ return NULL;
+ ft_wwn->wwpn = wwpn;
+
+ mutex_lock(&ft_lport_lock);
+ list_for_each_entry(old_ft_wwn, &ft_wwn_list, ft_wwn_node) {
+ if (old_ft_wwn->wwpn == wwpn) {
+ mutex_unlock(&ft_lport_lock);
+ kfree(ft_wwn);
+ return NULL;
+ }
+ }
+ list_add_tail(&ft_wwn->ft_wwn_node, &ft_wwn_list);
+ ft_format_wwn(ft_wwn->name, sizeof(ft_wwn->name), wwpn);
+ mutex_unlock(&ft_lport_lock);
+
+ return &ft_wwn->se_wwn;
+}
+
+static void ft_del_wwn(struct se_wwn *wwn)
+{
+ struct ft_lport_wwn *ft_wwn = container_of(wwn,
+ struct ft_lport_wwn, se_wwn);
+
+ pr_debug("del wwn %s\n", ft_wwn->name);
+ mutex_lock(&ft_lport_lock);
+ list_del(&ft_wwn->ft_wwn_node);
+ mutex_unlock(&ft_lport_lock);
+
+ kfree(ft_wwn);
+}
+
+static ssize_t ft_wwn_show_attr_version(
+ struct target_fabric_configfs *tf,
+ char *page)
+{
+ return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on "
+ ""UTS_RELEASE"\n", utsname()->sysname, utsname()->machine);
+}
+
+TF_WWN_ATTR_RO(ft, version);
+
+static struct configfs_attribute *ft_wwn_attrs[] = {
+ &ft_wwn_version.attr,
+ NULL,
+};
+
+static char *ft_get_fabric_name(void)
+{
+ return "fc";
+}
+
+static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg)
+{
+ struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
+
+ return tpg->lport_wwn->name;
+}
+
+static u16 ft_get_tag(struct se_portal_group *se_tpg)
+{
+ struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
+
+ /*
+ * This tag is used when forming SCSI Name identifier in EVPD=1 0x83
+ * to represent the SCSI Target Port.
+ */
+ return tpg->index;
+}
+
+static u32 ft_get_default_depth(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static int ft_check_false(struct se_portal_group *se_tpg)
+{
+ return 0;
+}
+
+static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
+{
+}
+
+static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
+{
+ struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
+
+ return tpg->index;
+}
+
+static const struct target_core_fabric_ops ft_fabric_ops = {
+ .module = THIS_MODULE,
+ .name = "fc",
+ .get_fabric_name = ft_get_fabric_name,
+ .get_fabric_proto_ident = fc_get_fabric_proto_ident,
+ .tpg_get_wwn = ft_get_fabric_wwn,
+ .tpg_get_tag = ft_get_tag,
+ .tpg_get_default_depth = ft_get_default_depth,
+ .tpg_get_pr_transport_id = fc_get_pr_transport_id,
+ .tpg_get_pr_transport_id_len = fc_get_pr_transport_id_len,
+ .tpg_parse_pr_out_transport_id = fc_parse_pr_out_transport_id,
+ .tpg_check_demo_mode = ft_check_false,
+ .tpg_check_demo_mode_cache = ft_check_false,
+ .tpg_check_demo_mode_write_protect = ft_check_false,
+ .tpg_check_prod_mode_write_protect = ft_check_false,
+ .tpg_alloc_fabric_acl = ft_tpg_alloc_fabric_acl,
+ .tpg_release_fabric_acl = ft_tpg_release_fabric_acl,
+ .tpg_get_inst_index = ft_tpg_get_inst_index,
+ .check_stop_free = ft_check_stop_free,
+ .release_cmd = ft_release_cmd,
+ .shutdown_session = ft_sess_shutdown,
+ .close_session = ft_sess_close,
+ .sess_get_index = ft_sess_get_index,
+ .sess_get_initiator_sid = NULL,
+ .write_pending = ft_write_pending,
+ .write_pending_status = ft_write_pending_status,
+ .set_default_node_attributes = ft_set_default_node_attr,
+ .get_task_tag = ft_get_task_tag,
+ .get_cmd_state = ft_get_cmd_state,
+ .queue_data_in = ft_queue_data_in,
+ .queue_status = ft_queue_status,
+ .queue_tm_rsp = ft_queue_tm_resp,
+ .aborted_task = ft_aborted_task,
+ /*
+ * Setup function pointers for generic logic in
+ * target_core_fabric_configfs.c
+ */
+ .fabric_make_wwn = &ft_add_wwn,
+ .fabric_drop_wwn = &ft_del_wwn,
+ .fabric_make_tpg = &ft_add_tpg,
+ .fabric_drop_tpg = &ft_del_tpg,
+ .fabric_post_link = NULL,
+ .fabric_pre_unlink = NULL,
+ .fabric_make_np = NULL,
+ .fabric_drop_np = NULL,
+ .fabric_make_nodeacl = &ft_add_acl,
+ .fabric_drop_nodeacl = &ft_del_acl,
+
+ .tfc_wwn_attrs = ft_wwn_attrs,
+ .tfc_tpg_nacl_base_attrs = ft_nacl_base_attrs,
+};
+
+static struct notifier_block ft_notifier = {
+ .notifier_call = ft_lport_notify
+};
+
+static int __init ft_init(void)
+{
+ int ret;
+
+ ret = target_register_template(&ft_fabric_ops);
+ if (ret)
+ goto out;
+
+ ret = fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov);
+ if (ret)
+ goto out_unregister_template;
+
+ blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier);
+ fc_lport_iterate(ft_lport_add, NULL);
+ return 0;
+
+out_unregister_template:
+ target_unregister_template(&ft_fabric_ops);
+out:
+ return ret;
+}
+
+static void __exit ft_exit(void)
+{
+ blocking_notifier_chain_unregister(&fc_lport_notifier_head,
+ &ft_notifier);
+ fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);
+ fc_lport_iterate(ft_lport_del, NULL);
+ target_unregister_template(&ft_fabric_ops);
+ synchronize_rcu();
+}
+
+MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION);
+MODULE_LICENSE("GPL");
+module_init(ft_init);
+module_exit(ft_exit);