1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * (c) Copyright 2002-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/net.h>
27 #include <linux/delay.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/slab.h>
31 #include <linux/spinlock.h>
32 #include <linux/kthread.h>
34 #include <linux/cdrom.h>
35 #include <linux/module.h>
36 #include <linux/ratelimit.h>
37 #include <asm/unaligned.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_tcq.h>
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
47 #include <target/target_core_configfs.h>
49 #include "target_core_internal.h"
50 #include "target_core_alua.h"
51 #include "target_core_pr.h"
52 #include "target_core_ua.h"
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/target.h>
57 static struct workqueue_struct *target_completion_wq;
58 static struct kmem_cache *se_sess_cache;
59 struct kmem_cache *se_ua_cache;
60 struct kmem_cache *t10_pr_reg_cache;
61 struct kmem_cache *t10_alua_lu_gp_cache;
62 struct kmem_cache *t10_alua_lu_gp_mem_cache;
63 struct kmem_cache *t10_alua_tg_pt_gp_cache;
64 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
65 struct kmem_cache *t10_alua_lba_map_cache;
66 struct kmem_cache *t10_alua_lba_map_mem_cache;
68 static void transport_complete_task_attr(struct se_cmd *cmd);
69 static void transport_handle_queue_full(struct se_cmd *cmd,
70 struct se_device *dev);
71 static int transport_put_cmd(struct se_cmd *cmd);
72 static void target_complete_ok_work(struct work_struct *work);
74 int init_se_kmem_caches(void)
76 se_sess_cache = kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session), __alignof__(struct se_session),
80 pr_err("kmem_cache_create() for struct se_session"
84 se_ua_cache = kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua), __alignof__(struct se_ua),
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
89 goto out_free_sess_cache;
91 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration),
93 __alignof__(struct t10_pr_registration), 0, NULL);
94 if (!t10_pr_reg_cache) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
97 goto out_free_ua_cache;
99 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
102 if (!t10_alua_lu_gp_cache) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
105 goto out_free_pr_reg_cache;
107 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member),
109 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
110 if (!t10_alua_lu_gp_mem_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
113 goto out_free_lu_gp_cache;
115 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp),
117 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
118 if (!t10_alua_tg_pt_gp_cache) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
121 goto out_free_lu_gp_mem_cache;
123 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member),
126 __alignof__(struct t10_alua_tg_pt_gp_member),
128 if (!t10_alua_tg_pt_gp_mem_cache) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
131 goto out_free_tg_pt_gp_cache;
133 t10_alua_lba_map_cache = kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map),
136 __alignof__(struct t10_alua_lba_map), 0, NULL);
137 if (!t10_alua_lba_map_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
140 goto out_free_tg_pt_gp_mem_cache;
142 t10_alua_lba_map_mem_cache = kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member),
145 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
146 if (!t10_alua_lba_map_mem_cache) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
149 goto out_free_lba_map_cache;
152 target_completion_wq = alloc_workqueue("target_completion",
154 if (!target_completion_wq)
155 goto out_free_lba_map_mem_cache;
159 out_free_lba_map_mem_cache:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
161 out_free_lba_map_cache:
162 kmem_cache_destroy(t10_alua_lba_map_cache);
163 out_free_tg_pt_gp_mem_cache:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
165 out_free_tg_pt_gp_cache:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167 out_free_lu_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169 out_free_lu_gp_cache:
170 kmem_cache_destroy(t10_alua_lu_gp_cache);
171 out_free_pr_reg_cache:
172 kmem_cache_destroy(t10_pr_reg_cache);
174 kmem_cache_destroy(se_ua_cache);
176 kmem_cache_destroy(se_sess_cache);
181 void release_se_kmem_caches(void)
183 destroy_workqueue(target_completion_wq);
184 kmem_cache_destroy(se_sess_cache);
185 kmem_cache_destroy(se_ua_cache);
186 kmem_cache_destroy(t10_pr_reg_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_cache);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
191 kmem_cache_destroy(t10_alua_lba_map_cache);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
195 /* This code ensures unique mib indexes are handed out. */
196 static DEFINE_SPINLOCK(scsi_mib_index_lock);
197 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
200 * Allocate a new row index for the entry type specified
202 u32 scsi_get_new_index(scsi_index_t type)
206 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
208 spin_lock(&scsi_mib_index_lock);
209 new_index = ++scsi_mib_index[type];
210 spin_unlock(&scsi_mib_index_lock);
215 void transport_subsystem_check_init(void)
218 static int sub_api_initialized;
220 if (sub_api_initialized)
223 ret = request_module("target_core_iblock");
225 pr_err("Unable to load target_core_iblock\n");
227 ret = request_module("target_core_file");
229 pr_err("Unable to load target_core_file\n");
231 ret = request_module("target_core_pscsi");
233 pr_err("Unable to load target_core_pscsi\n");
235 sub_api_initialized = 1;
238 struct se_session *transport_init_session(void)
240 struct se_session *se_sess;
242 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
244 pr_err("Unable to allocate struct se_session from"
246 return ERR_PTR(-ENOMEM);
248 INIT_LIST_HEAD(&se_sess->sess_list);
249 INIT_LIST_HEAD(&se_sess->sess_acl_list);
250 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
251 INIT_LIST_HEAD(&se_sess->sess_wait_list);
252 spin_lock_init(&se_sess->sess_cmd_lock);
253 kref_init(&se_sess->sess_kref);
257 EXPORT_SYMBOL(transport_init_session);
259 int transport_alloc_session_tags(struct se_session *se_sess,
260 unsigned int tag_num, unsigned int tag_size)
264 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
265 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
266 if (!se_sess->sess_cmd_map) {
267 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
268 if (!se_sess->sess_cmd_map) {
269 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
274 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
276 pr_err("Unable to init se_sess->sess_tag_pool,"
277 " tag_num: %u\n", tag_num);
278 if (is_vmalloc_addr(se_sess->sess_cmd_map))
279 vfree(se_sess->sess_cmd_map);
281 kfree(se_sess->sess_cmd_map);
282 se_sess->sess_cmd_map = NULL;
288 EXPORT_SYMBOL(transport_alloc_session_tags);
290 struct se_session *transport_init_session_tags(unsigned int tag_num,
291 unsigned int tag_size)
293 struct se_session *se_sess;
296 se_sess = transport_init_session();
300 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
302 transport_free_session(se_sess);
303 return ERR_PTR(-ENOMEM);
308 EXPORT_SYMBOL(transport_init_session_tags);
311 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
313 void __transport_register_session(
314 struct se_portal_group *se_tpg,
315 struct se_node_acl *se_nacl,
316 struct se_session *se_sess,
317 void *fabric_sess_ptr)
319 unsigned char buf[PR_REG_ISID_LEN];
321 se_sess->se_tpg = se_tpg;
322 se_sess->fabric_sess_ptr = fabric_sess_ptr;
324 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
326 * Only set for struct se_session's that will actually be moving I/O.
327 * eg: *NOT* discovery sessions.
331 * If the fabric module supports an ISID based TransportID,
332 * save this value in binary from the fabric I_T Nexus now.
334 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
335 memset(&buf[0], 0, PR_REG_ISID_LEN);
336 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
337 &buf[0], PR_REG_ISID_LEN);
338 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
340 kref_get(&se_nacl->acl_kref);
342 spin_lock_irq(&se_nacl->nacl_sess_lock);
344 * The se_nacl->nacl_sess pointer will be set to the
345 * last active I_T Nexus for each struct se_node_acl.
347 se_nacl->nacl_sess = se_sess;
349 list_add_tail(&se_sess->sess_acl_list,
350 &se_nacl->acl_sess_list);
351 spin_unlock_irq(&se_nacl->nacl_sess_lock);
353 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
355 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
356 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
358 EXPORT_SYMBOL(__transport_register_session);
360 void transport_register_session(
361 struct se_portal_group *se_tpg,
362 struct se_node_acl *se_nacl,
363 struct se_session *se_sess,
364 void *fabric_sess_ptr)
368 spin_lock_irqsave(&se_tpg->session_lock, flags);
369 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
370 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
372 EXPORT_SYMBOL(transport_register_session);
374 static void target_release_session(struct kref *kref)
376 struct se_session *se_sess = container_of(kref,
377 struct se_session, sess_kref);
378 struct se_portal_group *se_tpg = se_sess->se_tpg;
380 se_tpg->se_tpg_tfo->close_session(se_sess);
383 void target_get_session(struct se_session *se_sess)
385 kref_get(&se_sess->sess_kref);
387 EXPORT_SYMBOL(target_get_session);
389 void target_put_session(struct se_session *se_sess)
391 struct se_portal_group *tpg = se_sess->se_tpg;
393 if (tpg->se_tpg_tfo->put_session != NULL) {
394 tpg->se_tpg_tfo->put_session(se_sess);
397 kref_put(&se_sess->sess_kref, target_release_session);
399 EXPORT_SYMBOL(target_put_session);
401 static void target_complete_nacl(struct kref *kref)
403 struct se_node_acl *nacl = container_of(kref,
404 struct se_node_acl, acl_kref);
406 complete(&nacl->acl_free_comp);
409 void target_put_nacl(struct se_node_acl *nacl)
411 kref_put(&nacl->acl_kref, target_complete_nacl);
414 void transport_deregister_session_configfs(struct se_session *se_sess)
416 struct se_node_acl *se_nacl;
419 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
421 se_nacl = se_sess->se_node_acl;
423 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
424 if (se_nacl->acl_stop == 0)
425 list_del(&se_sess->sess_acl_list);
427 * If the session list is empty, then clear the pointer.
428 * Otherwise, set the struct se_session pointer from the tail
429 * element of the per struct se_node_acl active session list.
431 if (list_empty(&se_nacl->acl_sess_list))
432 se_nacl->nacl_sess = NULL;
434 se_nacl->nacl_sess = container_of(
435 se_nacl->acl_sess_list.prev,
436 struct se_session, sess_acl_list);
438 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
441 EXPORT_SYMBOL(transport_deregister_session_configfs);
443 void transport_free_session(struct se_session *se_sess)
445 if (se_sess->sess_cmd_map) {
446 percpu_ida_destroy(&se_sess->sess_tag_pool);
447 if (is_vmalloc_addr(se_sess->sess_cmd_map))
448 vfree(se_sess->sess_cmd_map);
450 kfree(se_sess->sess_cmd_map);
452 kmem_cache_free(se_sess_cache, se_sess);
454 EXPORT_SYMBOL(transport_free_session);
456 void transport_deregister_session(struct se_session *se_sess)
458 struct se_portal_group *se_tpg = se_sess->se_tpg;
459 struct target_core_fabric_ops *se_tfo;
460 struct se_node_acl *se_nacl;
462 bool comp_nacl = true;
465 transport_free_session(se_sess);
468 se_tfo = se_tpg->se_tpg_tfo;
470 spin_lock_irqsave(&se_tpg->session_lock, flags);
471 list_del(&se_sess->sess_list);
472 se_sess->se_tpg = NULL;
473 se_sess->fabric_sess_ptr = NULL;
474 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
477 * Determine if we need to do extra work for this initiator node's
478 * struct se_node_acl if it had been previously dynamically generated.
480 se_nacl = se_sess->se_node_acl;
482 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
483 if (se_nacl && se_nacl->dynamic_node_acl) {
484 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
485 list_del(&se_nacl->acl_list);
486 se_tpg->num_node_acls--;
487 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
488 core_tpg_wait_for_nacl_pr_ref(se_nacl);
489 core_free_device_list_for_node(se_nacl, se_tpg);
490 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
493 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
496 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
498 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
499 se_tpg->se_tpg_tfo->get_fabric_name());
501 * If last kref is dropping now for an explicit NodeACL, awake sleeping
502 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
505 if (se_nacl && comp_nacl == true)
506 target_put_nacl(se_nacl);
508 transport_free_session(se_sess);
510 EXPORT_SYMBOL(transport_deregister_session);
513 * Called with cmd->t_state_lock held.
515 static void target_remove_from_state_list(struct se_cmd *cmd)
517 struct se_device *dev = cmd->se_dev;
523 if (cmd->transport_state & CMD_T_BUSY)
526 spin_lock_irqsave(&dev->execute_task_lock, flags);
527 if (cmd->state_active) {
528 list_del(&cmd->state_list);
529 cmd->state_active = false;
531 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
534 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
539 spin_lock_irqsave(&cmd->t_state_lock, flags);
541 cmd->t_state = TRANSPORT_WRITE_PENDING;
543 if (remove_from_lists) {
544 target_remove_from_state_list(cmd);
547 * Clear struct se_cmd->se_lun before the handoff to FE.
553 * Determine if frontend context caller is requesting the stopping of
554 * this command for frontend exceptions.
556 if (cmd->transport_state & CMD_T_STOP) {
557 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
559 cmd->se_tfo->get_task_tag(cmd));
561 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
563 complete_all(&cmd->t_transport_stop_comp);
567 cmd->transport_state &= ~CMD_T_ACTIVE;
568 if (remove_from_lists) {
570 * Some fabric modules like tcm_loop can release
571 * their internally allocated I/O reference now and
574 * Fabric modules are expected to return '1' here if the
575 * se_cmd being passed is released at this point,
576 * or zero if not being released.
578 if (cmd->se_tfo->check_stop_free != NULL) {
579 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
580 return cmd->se_tfo->check_stop_free(cmd);
584 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
588 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
590 return transport_cmd_check_stop(cmd, true, false);
593 static void transport_lun_remove_cmd(struct se_cmd *cmd)
595 struct se_lun *lun = cmd->se_lun;
600 if (cmpxchg(&cmd->lun_ref_active, true, false))
601 percpu_ref_put(&lun->lun_ref);
604 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
606 if (transport_cmd_check_stop_to_fabric(cmd))
609 transport_put_cmd(cmd);
612 static void target_complete_failure_work(struct work_struct *work)
614 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
616 transport_generic_request_failure(cmd,
617 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
621 * Used when asking transport to copy Sense Data from the underlying
622 * Linux/SCSI struct scsi_cmnd
624 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
626 struct se_device *dev = cmd->se_dev;
628 WARN_ON(!cmd->se_lun);
633 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
636 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
638 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
639 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
640 return cmd->sense_buffer;
643 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
645 struct se_device *dev = cmd->se_dev;
646 int success = scsi_status == GOOD;
649 cmd->scsi_status = scsi_status;
652 spin_lock_irqsave(&cmd->t_state_lock, flags);
653 cmd->transport_state &= ~CMD_T_BUSY;
655 if (dev && dev->transport->transport_complete) {
656 dev->transport->transport_complete(cmd,
658 transport_get_sense_buffer(cmd));
659 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
664 * See if we are waiting to complete for an exception condition.
666 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
667 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
668 complete(&cmd->task_stop_comp);
673 * Check for case where an explicit ABORT_TASK has been received
674 * and transport_wait_for_tasks() will be waiting for completion..
676 if (cmd->transport_state & CMD_T_ABORTED &&
677 cmd->transport_state & CMD_T_STOP) {
678 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
679 complete_all(&cmd->t_transport_stop_comp);
681 } else if (!success) {
682 INIT_WORK(&cmd->work, target_complete_failure_work);
684 INIT_WORK(&cmd->work, target_complete_ok_work);
687 cmd->t_state = TRANSPORT_COMPLETE;
688 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
689 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
691 queue_work(target_completion_wq, &cmd->work);
693 EXPORT_SYMBOL(target_complete_cmd);
695 static void target_add_to_state_list(struct se_cmd *cmd)
697 struct se_device *dev = cmd->se_dev;
700 spin_lock_irqsave(&dev->execute_task_lock, flags);
701 if (!cmd->state_active) {
702 list_add_tail(&cmd->state_list, &dev->state_list);
703 cmd->state_active = true;
705 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
709 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
711 static void transport_write_pending_qf(struct se_cmd *cmd);
712 static void transport_complete_qf(struct se_cmd *cmd);
714 void target_qf_do_work(struct work_struct *work)
716 struct se_device *dev = container_of(work, struct se_device,
718 LIST_HEAD(qf_cmd_list);
719 struct se_cmd *cmd, *cmd_tmp;
721 spin_lock_irq(&dev->qf_cmd_lock);
722 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
723 spin_unlock_irq(&dev->qf_cmd_lock);
725 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
726 list_del(&cmd->se_qf_node);
727 atomic_dec(&dev->dev_qf_count);
728 smp_mb__after_atomic_dec();
730 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
731 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
732 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
733 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
736 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
737 transport_write_pending_qf(cmd);
738 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
739 transport_complete_qf(cmd);
743 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
745 switch (cmd->data_direction) {
748 case DMA_FROM_DEVICE:
752 case DMA_BIDIRECTIONAL:
761 void transport_dump_dev_state(
762 struct se_device *dev,
766 *bl += sprintf(b + *bl, "Status: ");
767 if (dev->export_count)
768 *bl += sprintf(b + *bl, "ACTIVATED");
770 *bl += sprintf(b + *bl, "DEACTIVATED");
772 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
773 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
774 dev->dev_attrib.block_size,
775 dev->dev_attrib.hw_max_sectors);
776 *bl += sprintf(b + *bl, " ");
779 void transport_dump_vpd_proto_id(
781 unsigned char *p_buf,
784 unsigned char buf[VPD_TMP_BUF_SIZE];
787 memset(buf, 0, VPD_TMP_BUF_SIZE);
788 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
790 switch (vpd->protocol_identifier) {
792 sprintf(buf+len, "Fibre Channel\n");
795 sprintf(buf+len, "Parallel SCSI\n");
798 sprintf(buf+len, "SSA\n");
801 sprintf(buf+len, "IEEE 1394\n");
804 sprintf(buf+len, "SCSI Remote Direct Memory Access"
808 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
811 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
814 sprintf(buf+len, "Automation/Drive Interface Transport"
818 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
821 sprintf(buf+len, "Unknown 0x%02x\n",
822 vpd->protocol_identifier);
827 strncpy(p_buf, buf, p_buf_len);
833 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
836 * Check if the Protocol Identifier Valid (PIV) bit is set..
838 * from spc3r23.pdf section 7.5.1
840 if (page_83[1] & 0x80) {
841 vpd->protocol_identifier = (page_83[0] & 0xf0);
842 vpd->protocol_identifier_set = 1;
843 transport_dump_vpd_proto_id(vpd, NULL, 0);
846 EXPORT_SYMBOL(transport_set_vpd_proto_id);
848 int transport_dump_vpd_assoc(
850 unsigned char *p_buf,
853 unsigned char buf[VPD_TMP_BUF_SIZE];
857 memset(buf, 0, VPD_TMP_BUF_SIZE);
858 len = sprintf(buf, "T10 VPD Identifier Association: ");
860 switch (vpd->association) {
862 sprintf(buf+len, "addressed logical unit\n");
865 sprintf(buf+len, "target port\n");
868 sprintf(buf+len, "SCSI target device\n");
871 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
877 strncpy(p_buf, buf, p_buf_len);
884 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
887 * The VPD identification association..
889 * from spc3r23.pdf Section 7.6.3.1 Table 297
891 vpd->association = (page_83[1] & 0x30);
892 return transport_dump_vpd_assoc(vpd, NULL, 0);
894 EXPORT_SYMBOL(transport_set_vpd_assoc);
896 int transport_dump_vpd_ident_type(
898 unsigned char *p_buf,
901 unsigned char buf[VPD_TMP_BUF_SIZE];
905 memset(buf, 0, VPD_TMP_BUF_SIZE);
906 len = sprintf(buf, "T10 VPD Identifier Type: ");
908 switch (vpd->device_identifier_type) {
910 sprintf(buf+len, "Vendor specific\n");
913 sprintf(buf+len, "T10 Vendor ID based\n");
916 sprintf(buf+len, "EUI-64 based\n");
919 sprintf(buf+len, "NAA\n");
922 sprintf(buf+len, "Relative target port identifier\n");
925 sprintf(buf+len, "SCSI name string\n");
928 sprintf(buf+len, "Unsupported: 0x%02x\n",
929 vpd->device_identifier_type);
935 if (p_buf_len < strlen(buf)+1)
937 strncpy(p_buf, buf, p_buf_len);
945 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
948 * The VPD identifier type..
950 * from spc3r23.pdf Section 7.6.3.1 Table 298
952 vpd->device_identifier_type = (page_83[1] & 0x0f);
953 return transport_dump_vpd_ident_type(vpd, NULL, 0);
955 EXPORT_SYMBOL(transport_set_vpd_ident_type);
957 int transport_dump_vpd_ident(
959 unsigned char *p_buf,
962 unsigned char buf[VPD_TMP_BUF_SIZE];
965 memset(buf, 0, VPD_TMP_BUF_SIZE);
967 switch (vpd->device_identifier_code_set) {
968 case 0x01: /* Binary */
969 snprintf(buf, sizeof(buf),
970 "T10 VPD Binary Device Identifier: %s\n",
971 &vpd->device_identifier[0]);
973 case 0x02: /* ASCII */
974 snprintf(buf, sizeof(buf),
975 "T10 VPD ASCII Device Identifier: %s\n",
976 &vpd->device_identifier[0]);
978 case 0x03: /* UTF-8 */
979 snprintf(buf, sizeof(buf),
980 "T10 VPD UTF-8 Device Identifier: %s\n",
981 &vpd->device_identifier[0]);
984 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
985 " 0x%02x", vpd->device_identifier_code_set);
991 strncpy(p_buf, buf, p_buf_len);
999 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1001 static const char hex_str[] = "0123456789abcdef";
1002 int j = 0, i = 4; /* offset to start of the identifier */
1005 * The VPD Code Set (encoding)
1007 * from spc3r23.pdf Section 7.6.3.1 Table 296
1009 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1010 switch (vpd->device_identifier_code_set) {
1011 case 0x01: /* Binary */
1012 vpd->device_identifier[j++] =
1013 hex_str[vpd->device_identifier_type];
1014 while (i < (4 + page_83[3])) {
1015 vpd->device_identifier[j++] =
1016 hex_str[(page_83[i] & 0xf0) >> 4];
1017 vpd->device_identifier[j++] =
1018 hex_str[page_83[i] & 0x0f];
1022 case 0x02: /* ASCII */
1023 case 0x03: /* UTF-8 */
1024 while (i < (4 + page_83[3]))
1025 vpd->device_identifier[j++] = page_83[i++];
1031 return transport_dump_vpd_ident(vpd, NULL, 0);
1033 EXPORT_SYMBOL(transport_set_vpd_ident);
1036 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1038 struct se_device *dev = cmd->se_dev;
1040 if (cmd->unknown_data_length) {
1041 cmd->data_length = size;
1042 } else if (size != cmd->data_length) {
1043 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1044 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1045 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1046 cmd->data_length, size, cmd->t_task_cdb[0]);
1048 if (cmd->data_direction == DMA_TO_DEVICE) {
1049 pr_err("Rejecting underflow/overflow"
1051 return TCM_INVALID_CDB_FIELD;
1054 * Reject READ_* or WRITE_* with overflow/underflow for
1055 * type SCF_SCSI_DATA_CDB.
1057 if (dev->dev_attrib.block_size != 512) {
1058 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1059 " CDB on non 512-byte sector setup subsystem"
1060 " plugin: %s\n", dev->transport->name);
1061 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1062 return TCM_INVALID_CDB_FIELD;
1065 * For the overflow case keep the existing fabric provided
1066 * ->data_length. Otherwise for the underflow case, reset
1067 * ->data_length to the smaller SCSI expected data transfer
1070 if (size > cmd->data_length) {
1071 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1072 cmd->residual_count = (size - cmd->data_length);
1074 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1075 cmd->residual_count = (cmd->data_length - size);
1076 cmd->data_length = size;
1085 * Used by fabric modules containing a local struct se_cmd within their
1086 * fabric dependent per I/O descriptor.
1088 void transport_init_se_cmd(
1090 struct target_core_fabric_ops *tfo,
1091 struct se_session *se_sess,
1095 unsigned char *sense_buffer)
1097 INIT_LIST_HEAD(&cmd->se_delayed_node);
1098 INIT_LIST_HEAD(&cmd->se_qf_node);
1099 INIT_LIST_HEAD(&cmd->se_cmd_list);
1100 INIT_LIST_HEAD(&cmd->state_list);
1101 init_completion(&cmd->t_transport_stop_comp);
1102 init_completion(&cmd->cmd_wait_comp);
1103 init_completion(&cmd->task_stop_comp);
1104 spin_lock_init(&cmd->t_state_lock);
1105 kref_init(&cmd->cmd_kref);
1106 cmd->transport_state = CMD_T_DEV_ACTIVE;
1109 cmd->se_sess = se_sess;
1110 cmd->data_length = data_length;
1111 cmd->data_direction = data_direction;
1112 cmd->sam_task_attr = task_attr;
1113 cmd->sense_buffer = sense_buffer;
1115 cmd->state_active = false;
1117 EXPORT_SYMBOL(transport_init_se_cmd);
1119 static sense_reason_t
1120 transport_check_alloc_task_attr(struct se_cmd *cmd)
1122 struct se_device *dev = cmd->se_dev;
1125 * Check if SAM Task Attribute emulation is enabled for this
1126 * struct se_device storage object
1128 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1131 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1132 pr_debug("SAM Task Attribute ACA"
1133 " emulation is not supported\n");
1134 return TCM_INVALID_CDB_FIELD;
1137 * Used to determine when ORDERED commands should go from
1138 * Dormant to Active status.
1140 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1141 smp_mb__after_atomic_inc();
1142 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1143 cmd->se_ordered_id, cmd->sam_task_attr,
1144 dev->transport->name);
1149 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1151 struct se_device *dev = cmd->se_dev;
1155 * Ensure that the received CDB is less than the max (252 + 8) bytes
1156 * for VARIABLE_LENGTH_CMD
1158 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1159 pr_err("Received SCSI CDB with command_size: %d that"
1160 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1161 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1162 return TCM_INVALID_CDB_FIELD;
1165 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1166 * allocate the additional extended CDB buffer now.. Otherwise
1167 * setup the pointer from __t_task_cdb to t_task_cdb.
1169 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1170 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1172 if (!cmd->t_task_cdb) {
1173 pr_err("Unable to allocate cmd->t_task_cdb"
1174 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1175 scsi_command_size(cdb),
1176 (unsigned long)sizeof(cmd->__t_task_cdb));
1177 return TCM_OUT_OF_RESOURCES;
1180 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1182 * Copy the original CDB into cmd->
1184 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1186 trace_target_sequencer_start(cmd);
1189 * Check for an existing UNIT ATTENTION condition
1191 ret = target_scsi3_ua_check(cmd);
1195 ret = target_alua_state_check(cmd);
1199 ret = target_check_reservation(cmd);
1201 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1205 ret = dev->transport->parse_cdb(cmd);
1209 ret = transport_check_alloc_task_attr(cmd);
1213 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1215 spin_lock(&cmd->se_lun->lun_sep_lock);
1216 if (cmd->se_lun->lun_sep)
1217 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1218 spin_unlock(&cmd->se_lun->lun_sep_lock);
1221 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1224 * Used by fabric module frontends to queue tasks directly.
1225 * Many only be used from process context only
1227 int transport_handle_cdb_direct(
1234 pr_err("cmd->se_lun is NULL\n");
1237 if (in_interrupt()) {
1239 pr_err("transport_generic_handle_cdb cannot be called"
1240 " from interrupt context\n");
1244 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1245 * outstanding descriptors are handled correctly during shutdown via
1246 * transport_wait_for_tasks()
1248 * Also, we don't take cmd->t_state_lock here as we only expect
1249 * this to be called for initial descriptor submission.
1251 cmd->t_state = TRANSPORT_NEW_CMD;
1252 cmd->transport_state |= CMD_T_ACTIVE;
1255 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1256 * so follow TRANSPORT_NEW_CMD processing thread context usage
1257 * and call transport_generic_request_failure() if necessary..
1259 ret = transport_generic_new_cmd(cmd);
1261 transport_generic_request_failure(cmd, ret);
1264 EXPORT_SYMBOL(transport_handle_cdb_direct);
1267 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1268 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1270 if (!sgl || !sgl_count)
1274 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1275 * scatterlists already have been set to follow what the fabric
1276 * passes for the original expected data transfer length.
1278 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1279 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1280 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1281 return TCM_INVALID_CDB_FIELD;
1284 cmd->t_data_sg = sgl;
1285 cmd->t_data_nents = sgl_count;
1287 if (sgl_bidi && sgl_bidi_count) {
1288 cmd->t_bidi_data_sg = sgl_bidi;
1289 cmd->t_bidi_data_nents = sgl_bidi_count;
1291 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1296 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1297 * se_cmd + use pre-allocated SGL memory.
1299 * @se_cmd: command descriptor to submit
1300 * @se_sess: associated se_sess for endpoint
1301 * @cdb: pointer to SCSI CDB
1302 * @sense: pointer to SCSI sense buffer
1303 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1304 * @data_length: fabric expected data transfer length
1305 * @task_addr: SAM task attribute
1306 * @data_dir: DMA data direction
1307 * @flags: flags for command submission from target_sc_flags_tables
1308 * @sgl: struct scatterlist memory for unidirectional mapping
1309 * @sgl_count: scatterlist count for unidirectional mapping
1310 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1311 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1312 * @sgl_prot: struct scatterlist memory protection information
1313 * @sgl_prot_count: scatterlist count for protection information
1315 * Returns non zero to signal active I/O shutdown failure. All other
1316 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1317 * but still return zero here.
1319 * This may only be called from process context, and also currently
1320 * assumes internal allocation of fabric payload buffer by target-core.
1322 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1323 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1324 u32 data_length, int task_attr, int data_dir, int flags,
1325 struct scatterlist *sgl, u32 sgl_count,
1326 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1327 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1329 struct se_portal_group *se_tpg;
1333 se_tpg = se_sess->se_tpg;
1335 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1336 BUG_ON(in_interrupt());
1338 * Initialize se_cmd for target operation. From this point
1339 * exceptions are handled by sending exception status via
1340 * target_core_fabric_ops->queue_status() callback
1342 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1343 data_length, data_dir, task_attr, sense);
1344 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1345 se_cmd->unknown_data_length = 1;
1347 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1348 * se_sess->sess_cmd_list. A second kref_get here is necessary
1349 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1350 * kref_put() to happen during fabric packet acknowledgement.
1352 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1356 * Signal bidirectional data payloads to target-core
1358 if (flags & TARGET_SCF_BIDI_OP)
1359 se_cmd->se_cmd_flags |= SCF_BIDI;
1361 * Locate se_lun pointer and attach it to struct se_cmd
1363 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1365 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1366 target_put_sess_cmd(se_sess, se_cmd);
1370 * Save pointers for SGLs containing protection information,
1373 if (sgl_prot_count) {
1374 se_cmd->t_prot_sg = sgl_prot;
1375 se_cmd->t_prot_nents = sgl_prot_count;
1378 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1380 transport_generic_request_failure(se_cmd, rc);
1384 * When a non zero sgl_count has been passed perform SGL passthrough
1385 * mapping for pre-allocated fabric memory instead of having target
1386 * core perform an internal SGL allocation..
1388 if (sgl_count != 0) {
1392 * A work-around for tcm_loop as some userspace code via
1393 * scsi-generic do not memset their associated read buffers,
1394 * so go ahead and do that here for type non-data CDBs. Also
1395 * note that this is currently guaranteed to be a single SGL
1396 * for this case by target core in target_setup_cmd_from_cdb()
1397 * -> transport_generic_cmd_sequencer().
1399 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1400 se_cmd->data_direction == DMA_FROM_DEVICE) {
1401 unsigned char *buf = NULL;
1404 buf = kmap(sg_page(sgl)) + sgl->offset;
1407 memset(buf, 0, sgl->length);
1408 kunmap(sg_page(sgl));
1412 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1413 sgl_bidi, sgl_bidi_count);
1415 transport_generic_request_failure(se_cmd, rc);
1421 * Check if we need to delay processing because of ALUA
1422 * Active/NonOptimized primary access state..
1424 core_alua_check_nonop_delay(se_cmd);
1426 transport_handle_cdb_direct(se_cmd);
1429 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1432 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1434 * @se_cmd: command descriptor to submit
1435 * @se_sess: associated se_sess for endpoint
1436 * @cdb: pointer to SCSI CDB
1437 * @sense: pointer to SCSI sense buffer
1438 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1439 * @data_length: fabric expected data transfer length
1440 * @task_addr: SAM task attribute
1441 * @data_dir: DMA data direction
1442 * @flags: flags for command submission from target_sc_flags_tables
1444 * Returns non zero to signal active I/O shutdown failure. All other
1445 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1446 * but still return zero here.
1448 * This may only be called from process context, and also currently
1449 * assumes internal allocation of fabric payload buffer by target-core.
1451 * It also assumes interal target core SGL memory allocation.
1453 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1454 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1455 u32 data_length, int task_attr, int data_dir, int flags)
1457 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1458 unpacked_lun, data_length, task_attr, data_dir,
1459 flags, NULL, 0, NULL, 0, NULL, 0);
1461 EXPORT_SYMBOL(target_submit_cmd);
1463 static void target_complete_tmr_failure(struct work_struct *work)
1465 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1467 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1468 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1470 transport_cmd_check_stop_to_fabric(se_cmd);
1474 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1477 * @se_cmd: command descriptor to submit
1478 * @se_sess: associated se_sess for endpoint
1479 * @sense: pointer to SCSI sense buffer
1480 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1481 * @fabric_context: fabric context for TMR req
1482 * @tm_type: Type of TM request
1483 * @gfp: gfp type for caller
1484 * @tag: referenced task tag for TMR_ABORT_TASK
1485 * @flags: submit cmd flags
1487 * Callable from all contexts.
1490 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1491 unsigned char *sense, u32 unpacked_lun,
1492 void *fabric_tmr_ptr, unsigned char tm_type,
1493 gfp_t gfp, unsigned int tag, int flags)
1495 struct se_portal_group *se_tpg;
1498 se_tpg = se_sess->se_tpg;
1501 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1502 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1504 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1505 * allocation failure.
1507 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1511 if (tm_type == TMR_ABORT_TASK)
1512 se_cmd->se_tmr_req->ref_task_tag = tag;
1514 /* See target_submit_cmd for commentary */
1515 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1517 core_tmr_release_req(se_cmd->se_tmr_req);
1521 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1524 * For callback during failure handling, push this work off
1525 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1527 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1528 schedule_work(&se_cmd->work);
1531 transport_generic_handle_tmr(se_cmd);
1534 EXPORT_SYMBOL(target_submit_tmr);
1537 * If the cmd is active, request it to be stopped and sleep until it
1540 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1542 bool was_active = false;
1544 if (cmd->transport_state & CMD_T_BUSY) {
1545 cmd->transport_state |= CMD_T_REQUEST_STOP;
1546 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1548 pr_debug("cmd %p waiting to complete\n", cmd);
1549 wait_for_completion(&cmd->task_stop_comp);
1550 pr_debug("cmd %p stopped successfully\n", cmd);
1552 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1553 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1554 cmd->transport_state &= ~CMD_T_BUSY;
1562 * Handle SAM-esque emulation for generic transport request failures.
1564 void transport_generic_request_failure(struct se_cmd *cmd,
1565 sense_reason_t sense_reason)
1569 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1570 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1571 cmd->t_task_cdb[0]);
1572 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1573 cmd->se_tfo->get_cmd_state(cmd),
1574 cmd->t_state, sense_reason);
1575 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1576 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1577 (cmd->transport_state & CMD_T_STOP) != 0,
1578 (cmd->transport_state & CMD_T_SENT) != 0);
1581 * For SAM Task Attribute emulation for failed struct se_cmd
1583 transport_complete_task_attr(cmd);
1585 * Handle special case for COMPARE_AND_WRITE failure, where the
1586 * callback is expected to drop the per device ->caw_mutex.
1588 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1589 cmd->transport_complete_callback)
1590 cmd->transport_complete_callback(cmd);
1592 switch (sense_reason) {
1593 case TCM_NON_EXISTENT_LUN:
1594 case TCM_UNSUPPORTED_SCSI_OPCODE:
1595 case TCM_INVALID_CDB_FIELD:
1596 case TCM_INVALID_PARAMETER_LIST:
1597 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1598 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1599 case TCM_UNKNOWN_MODE_PAGE:
1600 case TCM_WRITE_PROTECTED:
1601 case TCM_ADDRESS_OUT_OF_RANGE:
1602 case TCM_CHECK_CONDITION_ABORT_CMD:
1603 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1604 case TCM_CHECK_CONDITION_NOT_READY:
1605 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1606 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1607 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1609 case TCM_OUT_OF_RESOURCES:
1610 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1612 case TCM_RESERVATION_CONFLICT:
1614 * No SENSE Data payload for this case, set SCSI Status
1615 * and queue the response to $FABRIC_MOD.
1617 * Uses linux/include/scsi/scsi.h SAM status codes defs
1619 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1621 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1622 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1625 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1628 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1629 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1630 cmd->orig_fe_lun, 0x2C,
1631 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1633 trace_target_cmd_complete(cmd);
1634 ret = cmd->se_tfo-> queue_status(cmd);
1635 if (ret == -EAGAIN || ret == -ENOMEM)
1639 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1640 cmd->t_task_cdb[0], sense_reason);
1641 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1645 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1646 if (ret == -EAGAIN || ret == -ENOMEM)
1650 transport_lun_remove_cmd(cmd);
1651 if (!transport_cmd_check_stop_to_fabric(cmd))
1656 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1657 transport_handle_queue_full(cmd, cmd->se_dev);
1659 EXPORT_SYMBOL(transport_generic_request_failure);
1661 void __target_execute_cmd(struct se_cmd *cmd)
1665 if (cmd->execute_cmd) {
1666 ret = cmd->execute_cmd(cmd);
1668 spin_lock_irq(&cmd->t_state_lock);
1669 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1670 spin_unlock_irq(&cmd->t_state_lock);
1672 transport_generic_request_failure(cmd, ret);
1677 static bool target_handle_task_attr(struct se_cmd *cmd)
1679 struct se_device *dev = cmd->se_dev;
1681 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1685 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1686 * to allow the passed struct se_cmd list of tasks to the front of the list.
1688 switch (cmd->sam_task_attr) {
1690 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1691 "se_ordered_id: %u\n",
1692 cmd->t_task_cdb[0], cmd->se_ordered_id);
1694 case MSG_ORDERED_TAG:
1695 atomic_inc(&dev->dev_ordered_sync);
1696 smp_mb__after_atomic_inc();
1698 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1699 " se_ordered_id: %u\n",
1700 cmd->t_task_cdb[0], cmd->se_ordered_id);
1703 * Execute an ORDERED command if no other older commands
1704 * exist that need to be completed first.
1706 if (!atomic_read(&dev->simple_cmds))
1711 * For SIMPLE and UNTAGGED Task Attribute commands
1713 atomic_inc(&dev->simple_cmds);
1714 smp_mb__after_atomic_inc();
1718 if (atomic_read(&dev->dev_ordered_sync) == 0)
1721 spin_lock(&dev->delayed_cmd_lock);
1722 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1723 spin_unlock(&dev->delayed_cmd_lock);
1725 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1726 " delayed CMD list, se_ordered_id: %u\n",
1727 cmd->t_task_cdb[0], cmd->sam_task_attr,
1728 cmd->se_ordered_id);
1732 void target_execute_cmd(struct se_cmd *cmd)
1735 * If the received CDB has aleady been aborted stop processing it here.
1737 if (transport_check_aborted_status(cmd, 1))
1741 * Determine if frontend context caller is requesting the stopping of
1742 * this command for frontend exceptions.
1744 spin_lock_irq(&cmd->t_state_lock);
1745 if (cmd->transport_state & CMD_T_STOP) {
1746 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1748 cmd->se_tfo->get_task_tag(cmd));
1750 spin_unlock_irq(&cmd->t_state_lock);
1751 complete_all(&cmd->t_transport_stop_comp);
1755 cmd->t_state = TRANSPORT_PROCESSING;
1756 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1757 spin_unlock_irq(&cmd->t_state_lock);
1759 if (target_handle_task_attr(cmd)) {
1760 spin_lock_irq(&cmd->t_state_lock);
1761 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1762 spin_unlock_irq(&cmd->t_state_lock);
1766 __target_execute_cmd(cmd);
1768 EXPORT_SYMBOL(target_execute_cmd);
1771 * Process all commands up to the last received ORDERED task attribute which
1772 * requires another blocking boundary
1774 static void target_restart_delayed_cmds(struct se_device *dev)
1779 spin_lock(&dev->delayed_cmd_lock);
1780 if (list_empty(&dev->delayed_cmd_list)) {
1781 spin_unlock(&dev->delayed_cmd_lock);
1785 cmd = list_entry(dev->delayed_cmd_list.next,
1786 struct se_cmd, se_delayed_node);
1787 list_del(&cmd->se_delayed_node);
1788 spin_unlock(&dev->delayed_cmd_lock);
1790 __target_execute_cmd(cmd);
1792 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1798 * Called from I/O completion to determine which dormant/delayed
1799 * and ordered cmds need to have their tasks added to the execution queue.
1801 static void transport_complete_task_attr(struct se_cmd *cmd)
1803 struct se_device *dev = cmd->se_dev;
1805 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1808 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1809 atomic_dec(&dev->simple_cmds);
1810 smp_mb__after_atomic_dec();
1811 dev->dev_cur_ordered_id++;
1812 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1813 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1814 cmd->se_ordered_id);
1815 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1816 dev->dev_cur_ordered_id++;
1817 pr_debug("Incremented dev_cur_ordered_id: %u for"
1818 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1819 cmd->se_ordered_id);
1820 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1821 atomic_dec(&dev->dev_ordered_sync);
1822 smp_mb__after_atomic_dec();
1824 dev->dev_cur_ordered_id++;
1825 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1826 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1829 target_restart_delayed_cmds(dev);
1832 static void transport_complete_qf(struct se_cmd *cmd)
1836 transport_complete_task_attr(cmd);
1838 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1839 trace_target_cmd_complete(cmd);
1840 ret = cmd->se_tfo->queue_status(cmd);
1845 switch (cmd->data_direction) {
1846 case DMA_FROM_DEVICE:
1847 trace_target_cmd_complete(cmd);
1848 ret = cmd->se_tfo->queue_data_in(cmd);
1851 if (cmd->se_cmd_flags & SCF_BIDI) {
1852 ret = cmd->se_tfo->queue_data_in(cmd);
1856 /* Fall through for DMA_TO_DEVICE */
1858 trace_target_cmd_complete(cmd);
1859 ret = cmd->se_tfo->queue_status(cmd);
1867 transport_handle_queue_full(cmd, cmd->se_dev);
1870 transport_lun_remove_cmd(cmd);
1871 transport_cmd_check_stop_to_fabric(cmd);
1874 static void transport_handle_queue_full(
1876 struct se_device *dev)
1878 spin_lock_irq(&dev->qf_cmd_lock);
1879 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1880 atomic_inc(&dev->dev_qf_count);
1881 smp_mb__after_atomic_inc();
1882 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1884 schedule_work(&cmd->se_dev->qf_work_queue);
1887 static void target_complete_ok_work(struct work_struct *work)
1889 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1893 * Check if we need to move delayed/dormant tasks from cmds on the
1894 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1897 transport_complete_task_attr(cmd);
1900 * Check to schedule QUEUE_FULL work, or execute an existing
1901 * cmd->transport_qf_callback()
1903 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1904 schedule_work(&cmd->se_dev->qf_work_queue);
1907 * Check if we need to send a sense buffer from
1908 * the struct se_cmd in question.
1910 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1911 WARN_ON(!cmd->scsi_status);
1912 ret = transport_send_check_condition_and_sense(
1914 if (ret == -EAGAIN || ret == -ENOMEM)
1917 transport_lun_remove_cmd(cmd);
1918 transport_cmd_check_stop_to_fabric(cmd);
1922 * Check for a callback, used by amongst other things
1923 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
1925 if (cmd->transport_complete_callback) {
1928 rc = cmd->transport_complete_callback(cmd);
1929 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
1932 ret = transport_send_check_condition_and_sense(cmd,
1934 if (ret == -EAGAIN || ret == -ENOMEM)
1937 transport_lun_remove_cmd(cmd);
1938 transport_cmd_check_stop_to_fabric(cmd);
1943 switch (cmd->data_direction) {
1944 case DMA_FROM_DEVICE:
1945 spin_lock(&cmd->se_lun->lun_sep_lock);
1946 if (cmd->se_lun->lun_sep) {
1947 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1950 spin_unlock(&cmd->se_lun->lun_sep_lock);
1952 trace_target_cmd_complete(cmd);
1953 ret = cmd->se_tfo->queue_data_in(cmd);
1954 if (ret == -EAGAIN || ret == -ENOMEM)
1958 spin_lock(&cmd->se_lun->lun_sep_lock);
1959 if (cmd->se_lun->lun_sep) {
1960 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
1963 spin_unlock(&cmd->se_lun->lun_sep_lock);
1965 * Check if we need to send READ payload for BIDI-COMMAND
1967 if (cmd->se_cmd_flags & SCF_BIDI) {
1968 spin_lock(&cmd->se_lun->lun_sep_lock);
1969 if (cmd->se_lun->lun_sep) {
1970 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1973 spin_unlock(&cmd->se_lun->lun_sep_lock);
1974 ret = cmd->se_tfo->queue_data_in(cmd);
1975 if (ret == -EAGAIN || ret == -ENOMEM)
1979 /* Fall through for DMA_TO_DEVICE */
1981 trace_target_cmd_complete(cmd);
1982 ret = cmd->se_tfo->queue_status(cmd);
1983 if (ret == -EAGAIN || ret == -ENOMEM)
1990 transport_lun_remove_cmd(cmd);
1991 transport_cmd_check_stop_to_fabric(cmd);
1995 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
1996 " data_direction: %d\n", cmd, cmd->data_direction);
1997 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1998 transport_handle_queue_full(cmd, cmd->se_dev);
2001 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2003 struct scatterlist *sg;
2006 for_each_sg(sgl, sg, nents, count)
2007 __free_page(sg_page(sg));
2012 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2015 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2016 * emulation, and free + reset pointers if necessary..
2018 if (!cmd->t_data_sg_orig)
2021 kfree(cmd->t_data_sg);
2022 cmd->t_data_sg = cmd->t_data_sg_orig;
2023 cmd->t_data_sg_orig = NULL;
2024 cmd->t_data_nents = cmd->t_data_nents_orig;
2025 cmd->t_data_nents_orig = 0;
2028 static inline void transport_free_pages(struct se_cmd *cmd)
2030 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2031 transport_reset_sgl_orig(cmd);
2034 transport_reset_sgl_orig(cmd);
2036 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2037 cmd->t_data_sg = NULL;
2038 cmd->t_data_nents = 0;
2040 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2041 cmd->t_bidi_data_sg = NULL;
2042 cmd->t_bidi_data_nents = 0;
2046 * transport_release_cmd - free a command
2047 * @cmd: command to free
2049 * This routine unconditionally frees a command, and reference counting
2050 * or list removal must be done in the caller.
2052 static int transport_release_cmd(struct se_cmd *cmd)
2054 BUG_ON(!cmd->se_tfo);
2056 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2057 core_tmr_release_req(cmd->se_tmr_req);
2058 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2059 kfree(cmd->t_task_cdb);
2061 * If this cmd has been setup with target_get_sess_cmd(), drop
2062 * the kref and call ->release_cmd() in kref callback.
2064 return target_put_sess_cmd(cmd->se_sess, cmd);
2068 * transport_put_cmd - release a reference to a command
2069 * @cmd: command to release
2071 * This routine releases our reference to the command and frees it if possible.
2073 static int transport_put_cmd(struct se_cmd *cmd)
2075 transport_free_pages(cmd);
2076 return transport_release_cmd(cmd);
2079 void *transport_kmap_data_sg(struct se_cmd *cmd)
2081 struct scatterlist *sg = cmd->t_data_sg;
2082 struct page **pages;
2086 * We need to take into account a possible offset here for fabrics like
2087 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2088 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2090 if (!cmd->t_data_nents)
2094 if (cmd->t_data_nents == 1)
2095 return kmap(sg_page(sg)) + sg->offset;
2097 /* >1 page. use vmap */
2098 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2102 /* convert sg[] to pages[] */
2103 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2104 pages[i] = sg_page(sg);
2107 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2109 if (!cmd->t_data_vmap)
2112 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2114 EXPORT_SYMBOL(transport_kmap_data_sg);
2116 void transport_kunmap_data_sg(struct se_cmd *cmd)
2118 if (!cmd->t_data_nents) {
2120 } else if (cmd->t_data_nents == 1) {
2121 kunmap(sg_page(cmd->t_data_sg));
2125 vunmap(cmd->t_data_vmap);
2126 cmd->t_data_vmap = NULL;
2128 EXPORT_SYMBOL(transport_kunmap_data_sg);
2131 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2134 struct scatterlist *sg;
2136 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2140 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2141 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2145 sg_init_table(sg, nent);
2148 u32 page_len = min_t(u32, length, PAGE_SIZE);
2149 page = alloc_page(GFP_KERNEL | zero_flag);
2153 sg_set_page(&sg[i], page, page_len, 0);
2164 __free_page(sg_page(&sg[i]));
2171 * Allocate any required resources to execute the command. For writes we
2172 * might not have the payload yet, so notify the fabric via a call to
2173 * ->write_pending instead. Otherwise place it on the execution queue.
2176 transport_generic_new_cmd(struct se_cmd *cmd)
2181 * Determine is the TCM fabric module has already allocated physical
2182 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2185 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2187 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2189 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2190 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2193 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2194 bidi_length = cmd->t_task_nolb *
2195 cmd->se_dev->dev_attrib.block_size;
2197 bidi_length = cmd->data_length;
2199 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2200 &cmd->t_bidi_data_nents,
2201 bidi_length, zero_flag);
2203 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2206 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2207 cmd->data_length, zero_flag);
2209 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2212 * If this command is not a write we can execute it right here,
2213 * for write buffers we need to notify the fabric driver first
2214 * and let it call back once the write buffers are ready.
2216 target_add_to_state_list(cmd);
2217 if (cmd->data_direction != DMA_TO_DEVICE) {
2218 target_execute_cmd(cmd);
2221 transport_cmd_check_stop(cmd, false, true);
2223 ret = cmd->se_tfo->write_pending(cmd);
2224 if (ret == -EAGAIN || ret == -ENOMEM)
2227 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2230 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2233 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2234 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2235 transport_handle_queue_full(cmd, cmd->se_dev);
2238 EXPORT_SYMBOL(transport_generic_new_cmd);
2240 static void transport_write_pending_qf(struct se_cmd *cmd)
2244 ret = cmd->se_tfo->write_pending(cmd);
2245 if (ret == -EAGAIN || ret == -ENOMEM) {
2246 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2248 transport_handle_queue_full(cmd, cmd->se_dev);
2252 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2254 unsigned long flags;
2257 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2258 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2259 transport_wait_for_tasks(cmd);
2261 ret = transport_release_cmd(cmd);
2264 transport_wait_for_tasks(cmd);
2266 * Handle WRITE failure case where transport_generic_new_cmd()
2267 * has already added se_cmd to state_list, but fabric has
2268 * failed command before I/O submission.
2270 if (cmd->state_active) {
2271 spin_lock_irqsave(&cmd->t_state_lock, flags);
2272 target_remove_from_state_list(cmd);
2273 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2277 transport_lun_remove_cmd(cmd);
2279 ret = transport_put_cmd(cmd);
2283 EXPORT_SYMBOL(transport_generic_free_cmd);
2285 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2286 * @se_sess: session to reference
2287 * @se_cmd: command descriptor to add
2288 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2290 int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2293 unsigned long flags;
2297 * Add a second kref if the fabric caller is expecting to handle
2298 * fabric acknowledgement that requires two target_put_sess_cmd()
2299 * invocations before se_cmd descriptor release.
2301 if (ack_kref == true) {
2302 kref_get(&se_cmd->cmd_kref);
2303 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2306 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2307 if (se_sess->sess_tearing_down) {
2311 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2313 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2316 EXPORT_SYMBOL(target_get_sess_cmd);
2318 static void target_release_cmd_kref(struct kref *kref)
2320 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2321 struct se_session *se_sess = se_cmd->se_sess;
2323 if (list_empty(&se_cmd->se_cmd_list)) {
2324 spin_unlock(&se_sess->sess_cmd_lock);
2325 se_cmd->se_tfo->release_cmd(se_cmd);
2328 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2329 spin_unlock(&se_sess->sess_cmd_lock);
2330 complete(&se_cmd->cmd_wait_comp);
2333 list_del(&se_cmd->se_cmd_list);
2334 spin_unlock(&se_sess->sess_cmd_lock);
2336 se_cmd->se_tfo->release_cmd(se_cmd);
2339 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2340 * @se_sess: session to reference
2341 * @se_cmd: command descriptor to drop
2343 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2346 se_cmd->se_tfo->release_cmd(se_cmd);
2349 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2350 &se_sess->sess_cmd_lock);
2352 EXPORT_SYMBOL(target_put_sess_cmd);
2354 /* target_sess_cmd_list_set_waiting - Flag all commands in
2355 * sess_cmd_list to complete cmd_wait_comp. Set
2356 * sess_tearing_down so no more commands are queued.
2357 * @se_sess: session to flag
2359 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2361 struct se_cmd *se_cmd;
2362 unsigned long flags;
2364 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2365 if (se_sess->sess_tearing_down) {
2366 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2369 se_sess->sess_tearing_down = 1;
2370 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2372 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2373 se_cmd->cmd_wait_set = 1;
2375 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2377 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2379 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2380 * @se_sess: session to wait for active I/O
2382 void target_wait_for_sess_cmds(struct se_session *se_sess)
2384 struct se_cmd *se_cmd, *tmp_cmd;
2385 unsigned long flags;
2387 list_for_each_entry_safe(se_cmd, tmp_cmd,
2388 &se_sess->sess_wait_list, se_cmd_list) {
2389 list_del(&se_cmd->se_cmd_list);
2391 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2392 " %d\n", se_cmd, se_cmd->t_state,
2393 se_cmd->se_tfo->get_cmd_state(se_cmd));
2395 wait_for_completion(&se_cmd->cmd_wait_comp);
2396 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2397 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2398 se_cmd->se_tfo->get_cmd_state(se_cmd));
2400 se_cmd->se_tfo->release_cmd(se_cmd);
2403 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2404 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2405 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2408 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2410 static int transport_clear_lun_ref_thread(void *p)
2412 struct se_lun *lun = p;
2414 percpu_ref_kill(&lun->lun_ref);
2416 wait_for_completion(&lun->lun_ref_comp);
2417 complete(&lun->lun_shutdown_comp);
2422 int transport_clear_lun_ref(struct se_lun *lun)
2424 struct task_struct *kt;
2426 kt = kthread_run(transport_clear_lun_ref_thread, lun,
2427 "tcm_cl_%u", lun->unpacked_lun);
2429 pr_err("Unable to start clear_lun thread\n");
2432 wait_for_completion(&lun->lun_shutdown_comp);
2438 * transport_wait_for_tasks - wait for completion to occur
2439 * @cmd: command to wait
2441 * Called from frontend fabric context to wait for storage engine
2442 * to pause and/or release frontend generated struct se_cmd.
2444 bool transport_wait_for_tasks(struct se_cmd *cmd)
2446 unsigned long flags;
2448 spin_lock_irqsave(&cmd->t_state_lock, flags);
2449 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2450 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2451 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2455 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2456 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2457 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2461 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2462 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2466 cmd->transport_state |= CMD_T_STOP;
2468 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2469 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2470 cmd, cmd->se_tfo->get_task_tag(cmd),
2471 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2473 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2475 wait_for_completion(&cmd->t_transport_stop_comp);
2477 spin_lock_irqsave(&cmd->t_state_lock, flags);
2478 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2480 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2481 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2482 cmd->se_tfo->get_task_tag(cmd));
2484 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2488 EXPORT_SYMBOL(transport_wait_for_tasks);
2490 static int transport_get_sense_codes(
2495 *asc = cmd->scsi_asc;
2496 *ascq = cmd->scsi_ascq;
2502 void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2504 /* Place failed LBA in sense data information descriptor 0. */
2505 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2506 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2507 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2508 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2510 /* Descriptor Information: failing sector */
2511 put_unaligned_be64(bad_sector, &buffer[12]);
2515 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2516 sense_reason_t reason, int from_transport)
2518 unsigned char *buffer = cmd->sense_buffer;
2519 unsigned long flags;
2520 u8 asc = 0, ascq = 0;
2522 spin_lock_irqsave(&cmd->t_state_lock, flags);
2523 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2524 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2527 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2528 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2530 if (!reason && from_transport)
2533 if (!from_transport)
2534 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2537 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2538 * SENSE KEY values from include/scsi/scsi.h
2544 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2546 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2547 /* NO ADDITIONAL SENSE INFORMATION */
2548 buffer[SPC_ASC_KEY_OFFSET] = 0;
2549 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2551 case TCM_NON_EXISTENT_LUN:
2554 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2555 /* ILLEGAL REQUEST */
2556 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2557 /* LOGICAL UNIT NOT SUPPORTED */
2558 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2560 case TCM_UNSUPPORTED_SCSI_OPCODE:
2561 case TCM_SECTOR_COUNT_TOO_MANY:
2564 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2565 /* ILLEGAL REQUEST */
2566 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2567 /* INVALID COMMAND OPERATION CODE */
2568 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2570 case TCM_UNKNOWN_MODE_PAGE:
2573 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2574 /* ILLEGAL REQUEST */
2575 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2576 /* INVALID FIELD IN CDB */
2577 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2579 case TCM_CHECK_CONDITION_ABORT_CMD:
2582 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2583 /* ABORTED COMMAND */
2584 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2585 /* BUS DEVICE RESET FUNCTION OCCURRED */
2586 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2587 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2589 case TCM_INCORRECT_AMOUNT_OF_DATA:
2592 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2593 /* ABORTED COMMAND */
2594 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2596 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2597 /* NOT ENOUGH UNSOLICITED DATA */
2598 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2600 case TCM_INVALID_CDB_FIELD:
2603 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2604 /* ILLEGAL REQUEST */
2605 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2606 /* INVALID FIELD IN CDB */
2607 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2609 case TCM_INVALID_PARAMETER_LIST:
2612 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2613 /* ILLEGAL REQUEST */
2614 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2615 /* INVALID FIELD IN PARAMETER LIST */
2616 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2618 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2621 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2622 /* ILLEGAL REQUEST */
2623 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2624 /* PARAMETER LIST LENGTH ERROR */
2625 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2627 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2630 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2631 /* ABORTED COMMAND */
2632 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2634 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2635 /* UNEXPECTED_UNSOLICITED_DATA */
2636 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2638 case TCM_SERVICE_CRC_ERROR:
2641 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2642 /* ABORTED COMMAND */
2643 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2644 /* PROTOCOL SERVICE CRC ERROR */
2645 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2647 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2649 case TCM_SNACK_REJECTED:
2652 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2653 /* ABORTED COMMAND */
2654 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2656 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2657 /* FAILED RETRANSMISSION REQUEST */
2658 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2660 case TCM_WRITE_PROTECTED:
2663 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2665 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2666 /* WRITE PROTECTED */
2667 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2669 case TCM_ADDRESS_OUT_OF_RANGE:
2672 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2673 /* ILLEGAL REQUEST */
2674 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2675 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2676 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2678 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2681 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2682 /* UNIT ATTENTION */
2683 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2684 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2685 buffer[SPC_ASC_KEY_OFFSET] = asc;
2686 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2688 case TCM_CHECK_CONDITION_NOT_READY:
2691 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2693 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2694 transport_get_sense_codes(cmd, &asc, &ascq);
2695 buffer[SPC_ASC_KEY_OFFSET] = asc;
2696 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2698 case TCM_MISCOMPARE_VERIFY:
2701 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2702 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2703 /* MISCOMPARE DURING VERIFY OPERATION */
2704 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2705 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2707 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2710 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2711 /* ILLEGAL REQUEST */
2712 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2713 /* LOGICAL BLOCK GUARD CHECK FAILED */
2714 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2715 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
2716 transport_err_sector_info(buffer, cmd->bad_sector);
2718 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2721 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2722 /* ILLEGAL REQUEST */
2723 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2724 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2725 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2726 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
2727 transport_err_sector_info(buffer, cmd->bad_sector);
2729 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2732 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2733 /* ILLEGAL REQUEST */
2734 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2735 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2736 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2737 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2738 transport_err_sector_info(buffer, cmd->bad_sector);
2740 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2744 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2746 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2747 * Solaris initiators. Returning NOT READY instead means the
2748 * operations will be retried a finite number of times and we
2749 * can survive intermittent errors.
2751 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2752 /* LOGICAL UNIT COMMUNICATION FAILURE */
2753 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2757 * This code uses linux/include/scsi/scsi.h SAM status codes!
2759 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2761 * Automatically padded, this value is encoded in the fabric's
2762 * data_length response PDU containing the SCSI defined sense data.
2764 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2767 trace_target_cmd_complete(cmd);
2768 return cmd->se_tfo->queue_status(cmd);
2770 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2772 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2774 if (!(cmd->transport_state & CMD_T_ABORTED))
2777 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2780 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2781 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
2783 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2784 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2785 trace_target_cmd_complete(cmd);
2786 cmd->se_tfo->queue_status(cmd);
2790 EXPORT_SYMBOL(transport_check_aborted_status);
2792 void transport_send_task_abort(struct se_cmd *cmd)
2794 unsigned long flags;
2796 spin_lock_irqsave(&cmd->t_state_lock, flags);
2797 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
2798 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2801 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2804 * If there are still expected incoming fabric WRITEs, we wait
2805 * until until they have completed before sending a TASK_ABORTED
2806 * response. This response with TASK_ABORTED status will be
2807 * queued back to fabric module by transport_check_aborted_status().
2809 if (cmd->data_direction == DMA_TO_DEVICE) {
2810 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2811 cmd->transport_state |= CMD_T_ABORTED;
2812 smp_mb__after_atomic_inc();
2816 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2818 transport_lun_remove_cmd(cmd);
2820 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2821 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
2822 cmd->se_tfo->get_task_tag(cmd));
2824 trace_target_cmd_complete(cmd);
2825 cmd->se_tfo->queue_status(cmd);
2828 static void target_tmr_work(struct work_struct *work)
2830 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2831 struct se_device *dev = cmd->se_dev;
2832 struct se_tmr_req *tmr = cmd->se_tmr_req;
2835 switch (tmr->function) {
2836 case TMR_ABORT_TASK:
2837 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2839 case TMR_ABORT_TASK_SET:
2841 case TMR_CLEAR_TASK_SET:
2842 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2845 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2846 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2847 TMR_FUNCTION_REJECTED;
2849 case TMR_TARGET_WARM_RESET:
2850 tmr->response = TMR_FUNCTION_REJECTED;
2852 case TMR_TARGET_COLD_RESET:
2853 tmr->response = TMR_FUNCTION_REJECTED;
2856 pr_err("Uknown TMR function: 0x%02x.\n",
2858 tmr->response = TMR_FUNCTION_REJECTED;
2862 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
2863 cmd->se_tfo->queue_tm_rsp(cmd);
2865 transport_cmd_check_stop_to_fabric(cmd);
2868 int transport_generic_handle_tmr(
2871 unsigned long flags;
2873 spin_lock_irqsave(&cmd->t_state_lock, flags);
2874 cmd->transport_state |= CMD_T_ACTIVE;
2875 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2877 INIT_WORK(&cmd->work, target_tmr_work);
2878 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
2881 EXPORT_SYMBOL(transport_generic_handle_tmr);