1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * (c) Copyright 2002-2012 RisingTide Systems LLC.
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/blkdev.h>
32 #include <linux/spinlock.h>
33 #include <linux/kthread.h>
35 #include <linux/cdrom.h>
36 #include <linux/module.h>
37 #include <linux/ratelimit.h>
38 #include <asm/unaligned.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_cmnd.h>
43 #include <scsi/scsi_tcq.h>
45 #include <target/target_core_base.h>
46 #include <target/target_core_backend.h>
47 #include <target/target_core_fabric.h>
48 #include <target/target_core_configfs.h>
50 #include "target_core_internal.h"
51 #include "target_core_alua.h"
52 #include "target_core_pr.h"
53 #include "target_core_ua.h"
55 static struct workqueue_struct *target_completion_wq;
56 static struct kmem_cache *se_sess_cache;
57 struct kmem_cache *se_ua_cache;
58 struct kmem_cache *t10_pr_reg_cache;
59 struct kmem_cache *t10_alua_lu_gp_cache;
60 struct kmem_cache *t10_alua_lu_gp_mem_cache;
61 struct kmem_cache *t10_alua_tg_pt_gp_cache;
62 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
64 static void transport_complete_task_attr(struct se_cmd *cmd);
65 static void transport_handle_queue_full(struct se_cmd *cmd,
66 struct se_device *dev);
67 static int transport_generic_get_mem(struct se_cmd *cmd);
68 static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
69 static void transport_put_cmd(struct se_cmd *cmd);
70 static void target_complete_ok_work(struct work_struct *work);
72 int init_se_kmem_caches(void)
74 se_sess_cache = kmem_cache_create("se_sess_cache",
75 sizeof(struct se_session), __alignof__(struct se_session),
78 pr_err("kmem_cache_create() for struct se_session"
82 se_ua_cache = kmem_cache_create("se_ua_cache",
83 sizeof(struct se_ua), __alignof__(struct se_ua),
86 pr_err("kmem_cache_create() for struct se_ua failed\n");
87 goto out_free_sess_cache;
89 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
90 sizeof(struct t10_pr_registration),
91 __alignof__(struct t10_pr_registration), 0, NULL);
92 if (!t10_pr_reg_cache) {
93 pr_err("kmem_cache_create() for struct t10_pr_registration"
95 goto out_free_ua_cache;
97 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
98 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
100 if (!t10_alua_lu_gp_cache) {
101 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
103 goto out_free_pr_reg_cache;
105 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
106 sizeof(struct t10_alua_lu_gp_member),
107 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
108 if (!t10_alua_lu_gp_mem_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
111 goto out_free_lu_gp_cache;
113 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
114 sizeof(struct t10_alua_tg_pt_gp),
115 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
116 if (!t10_alua_tg_pt_gp_cache) {
117 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
119 goto out_free_lu_gp_mem_cache;
121 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
122 "t10_alua_tg_pt_gp_mem_cache",
123 sizeof(struct t10_alua_tg_pt_gp_member),
124 __alignof__(struct t10_alua_tg_pt_gp_member),
126 if (!t10_alua_tg_pt_gp_mem_cache) {
127 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
129 goto out_free_tg_pt_gp_cache;
132 target_completion_wq = alloc_workqueue("target_completion",
134 if (!target_completion_wq)
135 goto out_free_tg_pt_gp_mem_cache;
139 out_free_tg_pt_gp_mem_cache:
140 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
141 out_free_tg_pt_gp_cache:
142 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
143 out_free_lu_gp_mem_cache:
144 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
145 out_free_lu_gp_cache:
146 kmem_cache_destroy(t10_alua_lu_gp_cache);
147 out_free_pr_reg_cache:
148 kmem_cache_destroy(t10_pr_reg_cache);
150 kmem_cache_destroy(se_ua_cache);
152 kmem_cache_destroy(se_sess_cache);
157 void release_se_kmem_caches(void)
159 destroy_workqueue(target_completion_wq);
160 kmem_cache_destroy(se_sess_cache);
161 kmem_cache_destroy(se_ua_cache);
162 kmem_cache_destroy(t10_pr_reg_cache);
163 kmem_cache_destroy(t10_alua_lu_gp_cache);
164 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
165 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
166 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
169 /* This code ensures unique mib indexes are handed out. */
170 static DEFINE_SPINLOCK(scsi_mib_index_lock);
171 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
174 * Allocate a new row index for the entry type specified
176 u32 scsi_get_new_index(scsi_index_t type)
180 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
182 spin_lock(&scsi_mib_index_lock);
183 new_index = ++scsi_mib_index[type];
184 spin_unlock(&scsi_mib_index_lock);
189 void transport_subsystem_check_init(void)
192 static int sub_api_initialized;
194 if (sub_api_initialized)
197 ret = request_module("target_core_iblock");
199 pr_err("Unable to load target_core_iblock\n");
201 ret = request_module("target_core_file");
203 pr_err("Unable to load target_core_file\n");
205 ret = request_module("target_core_pscsi");
207 pr_err("Unable to load target_core_pscsi\n");
209 sub_api_initialized = 1;
212 struct se_session *transport_init_session(void)
214 struct se_session *se_sess;
216 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
218 pr_err("Unable to allocate struct se_session from"
220 return ERR_PTR(-ENOMEM);
222 INIT_LIST_HEAD(&se_sess->sess_list);
223 INIT_LIST_HEAD(&se_sess->sess_acl_list);
224 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
225 spin_lock_init(&se_sess->sess_cmd_lock);
226 kref_init(&se_sess->sess_kref);
230 EXPORT_SYMBOL(transport_init_session);
233 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
235 void __transport_register_session(
236 struct se_portal_group *se_tpg,
237 struct se_node_acl *se_nacl,
238 struct se_session *se_sess,
239 void *fabric_sess_ptr)
241 unsigned char buf[PR_REG_ISID_LEN];
243 se_sess->se_tpg = se_tpg;
244 se_sess->fabric_sess_ptr = fabric_sess_ptr;
246 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
248 * Only set for struct se_session's that will actually be moving I/O.
249 * eg: *NOT* discovery sessions.
253 * If the fabric module supports an ISID based TransportID,
254 * save this value in binary from the fabric I_T Nexus now.
256 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
257 memset(&buf[0], 0, PR_REG_ISID_LEN);
258 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
259 &buf[0], PR_REG_ISID_LEN);
260 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
262 kref_get(&se_nacl->acl_kref);
264 spin_lock_irq(&se_nacl->nacl_sess_lock);
266 * The se_nacl->nacl_sess pointer will be set to the
267 * last active I_T Nexus for each struct se_node_acl.
269 se_nacl->nacl_sess = se_sess;
271 list_add_tail(&se_sess->sess_acl_list,
272 &se_nacl->acl_sess_list);
273 spin_unlock_irq(&se_nacl->nacl_sess_lock);
275 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
277 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
278 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
280 EXPORT_SYMBOL(__transport_register_session);
282 void transport_register_session(
283 struct se_portal_group *se_tpg,
284 struct se_node_acl *se_nacl,
285 struct se_session *se_sess,
286 void *fabric_sess_ptr)
290 spin_lock_irqsave(&se_tpg->session_lock, flags);
291 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
292 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
294 EXPORT_SYMBOL(transport_register_session);
296 static void target_release_session(struct kref *kref)
298 struct se_session *se_sess = container_of(kref,
299 struct se_session, sess_kref);
300 struct se_portal_group *se_tpg = se_sess->se_tpg;
302 se_tpg->se_tpg_tfo->close_session(se_sess);
305 void target_get_session(struct se_session *se_sess)
307 kref_get(&se_sess->sess_kref);
309 EXPORT_SYMBOL(target_get_session);
311 void target_put_session(struct se_session *se_sess)
313 struct se_portal_group *tpg = se_sess->se_tpg;
315 if (tpg->se_tpg_tfo->put_session != NULL) {
316 tpg->se_tpg_tfo->put_session(se_sess);
319 kref_put(&se_sess->sess_kref, target_release_session);
321 EXPORT_SYMBOL(target_put_session);
323 static void target_complete_nacl(struct kref *kref)
325 struct se_node_acl *nacl = container_of(kref,
326 struct se_node_acl, acl_kref);
328 complete(&nacl->acl_free_comp);
331 void target_put_nacl(struct se_node_acl *nacl)
333 kref_put(&nacl->acl_kref, target_complete_nacl);
336 void transport_deregister_session_configfs(struct se_session *se_sess)
338 struct se_node_acl *se_nacl;
341 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
343 se_nacl = se_sess->se_node_acl;
345 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
346 if (se_nacl->acl_stop == 0)
347 list_del(&se_sess->sess_acl_list);
349 * If the session list is empty, then clear the pointer.
350 * Otherwise, set the struct se_session pointer from the tail
351 * element of the per struct se_node_acl active session list.
353 if (list_empty(&se_nacl->acl_sess_list))
354 se_nacl->nacl_sess = NULL;
356 se_nacl->nacl_sess = container_of(
357 se_nacl->acl_sess_list.prev,
358 struct se_session, sess_acl_list);
360 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
363 EXPORT_SYMBOL(transport_deregister_session_configfs);
365 void transport_free_session(struct se_session *se_sess)
367 kmem_cache_free(se_sess_cache, se_sess);
369 EXPORT_SYMBOL(transport_free_session);
371 void transport_deregister_session(struct se_session *se_sess)
373 struct se_portal_group *se_tpg = se_sess->se_tpg;
374 struct target_core_fabric_ops *se_tfo;
375 struct se_node_acl *se_nacl;
377 bool comp_nacl = true;
380 transport_free_session(se_sess);
383 se_tfo = se_tpg->se_tpg_tfo;
385 spin_lock_irqsave(&se_tpg->session_lock, flags);
386 list_del(&se_sess->sess_list);
387 se_sess->se_tpg = NULL;
388 se_sess->fabric_sess_ptr = NULL;
389 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
392 * Determine if we need to do extra work for this initiator node's
393 * struct se_node_acl if it had been previously dynamically generated.
395 se_nacl = se_sess->se_node_acl;
397 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
398 if (se_nacl && se_nacl->dynamic_node_acl) {
399 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
400 list_del(&se_nacl->acl_list);
401 se_tpg->num_node_acls--;
402 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
403 core_tpg_wait_for_nacl_pr_ref(se_nacl);
404 core_free_device_list_for_node(se_nacl, se_tpg);
405 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
408 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
411 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
413 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
414 se_tpg->se_tpg_tfo->get_fabric_name());
416 * If last kref is dropping now for an explict NodeACL, awake sleeping
417 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
420 if (se_nacl && comp_nacl == true)
421 target_put_nacl(se_nacl);
423 transport_free_session(se_sess);
425 EXPORT_SYMBOL(transport_deregister_session);
428 * Called with cmd->t_state_lock held.
430 static void target_remove_from_state_list(struct se_cmd *cmd)
432 struct se_device *dev = cmd->se_dev;
438 if (cmd->transport_state & CMD_T_BUSY)
441 spin_lock_irqsave(&dev->execute_task_lock, flags);
442 if (cmd->state_active) {
443 list_del(&cmd->state_list);
444 cmd->state_active = false;
446 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
449 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
453 spin_lock_irqsave(&cmd->t_state_lock, flags);
455 * Determine if IOCTL context caller in requesting the stopping of this
456 * command for LUN shutdown purposes.
458 if (cmd->transport_state & CMD_T_LUN_STOP) {
459 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
460 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
462 cmd->transport_state &= ~CMD_T_ACTIVE;
463 if (remove_from_lists)
464 target_remove_from_state_list(cmd);
465 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
467 complete(&cmd->transport_lun_stop_comp);
471 if (remove_from_lists) {
472 target_remove_from_state_list(cmd);
475 * Clear struct se_cmd->se_lun before the handoff to FE.
481 * Determine if frontend context caller is requesting the stopping of
482 * this command for frontend exceptions.
484 if (cmd->transport_state & CMD_T_STOP) {
485 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
487 cmd->se_tfo->get_task_tag(cmd));
489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
491 complete(&cmd->t_transport_stop_comp);
495 cmd->transport_state &= ~CMD_T_ACTIVE;
496 if (remove_from_lists) {
498 * Some fabric modules like tcm_loop can release
499 * their internally allocated I/O reference now and
502 * Fabric modules are expected to return '1' here if the
503 * se_cmd being passed is released at this point,
504 * or zero if not being released.
506 if (cmd->se_tfo->check_stop_free != NULL) {
507 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
508 return cmd->se_tfo->check_stop_free(cmd);
512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
516 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
518 return transport_cmd_check_stop(cmd, true);
521 static void transport_lun_remove_cmd(struct se_cmd *cmd)
523 struct se_lun *lun = cmd->se_lun;
529 spin_lock_irqsave(&cmd->t_state_lock, flags);
530 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
531 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
532 target_remove_from_state_list(cmd);
534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
536 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
537 if (!list_empty(&cmd->se_lun_node))
538 list_del_init(&cmd->se_lun_node);
539 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
542 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
544 if (transport_cmd_check_stop_to_fabric(cmd))
547 transport_put_cmd(cmd);
550 static void target_complete_failure_work(struct work_struct *work)
552 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
554 transport_generic_request_failure(cmd,
555 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
559 * Used when asking transport to copy Sense Data from the underlying
560 * Linux/SCSI struct scsi_cmnd
562 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
564 struct se_device *dev = cmd->se_dev;
566 WARN_ON(!cmd->se_lun);
571 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
574 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
576 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
577 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
578 return cmd->sense_buffer;
581 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
583 struct se_device *dev = cmd->se_dev;
584 int success = scsi_status == GOOD;
587 cmd->scsi_status = scsi_status;
590 spin_lock_irqsave(&cmd->t_state_lock, flags);
591 cmd->transport_state &= ~CMD_T_BUSY;
593 if (dev && dev->transport->transport_complete) {
594 dev->transport->transport_complete(cmd,
596 transport_get_sense_buffer(cmd));
597 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
602 * See if we are waiting to complete for an exception condition.
604 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
606 complete(&cmd->task_stop_comp);
611 cmd->transport_state |= CMD_T_FAILED;
614 * Check for case where an explict ABORT_TASK has been received
615 * and transport_wait_for_tasks() will be waiting for completion..
617 if (cmd->transport_state & CMD_T_ABORTED &&
618 cmd->transport_state & CMD_T_STOP) {
619 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
620 complete(&cmd->t_transport_stop_comp);
622 } else if (cmd->transport_state & CMD_T_FAILED) {
623 INIT_WORK(&cmd->work, target_complete_failure_work);
625 INIT_WORK(&cmd->work, target_complete_ok_work);
628 cmd->t_state = TRANSPORT_COMPLETE;
629 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
632 queue_work(target_completion_wq, &cmd->work);
634 EXPORT_SYMBOL(target_complete_cmd);
636 static void target_add_to_state_list(struct se_cmd *cmd)
638 struct se_device *dev = cmd->se_dev;
641 spin_lock_irqsave(&dev->execute_task_lock, flags);
642 if (!cmd->state_active) {
643 list_add_tail(&cmd->state_list, &dev->state_list);
644 cmd->state_active = true;
646 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
650 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
652 static void transport_write_pending_qf(struct se_cmd *cmd);
653 static void transport_complete_qf(struct se_cmd *cmd);
655 void target_qf_do_work(struct work_struct *work)
657 struct se_device *dev = container_of(work, struct se_device,
659 LIST_HEAD(qf_cmd_list);
660 struct se_cmd *cmd, *cmd_tmp;
662 spin_lock_irq(&dev->qf_cmd_lock);
663 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
664 spin_unlock_irq(&dev->qf_cmd_lock);
666 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
667 list_del(&cmd->se_qf_node);
668 atomic_dec(&dev->dev_qf_count);
669 smp_mb__after_atomic_dec();
671 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
672 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
673 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
674 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
677 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
678 transport_write_pending_qf(cmd);
679 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
680 transport_complete_qf(cmd);
684 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
686 switch (cmd->data_direction) {
689 case DMA_FROM_DEVICE:
693 case DMA_BIDIRECTIONAL:
702 void transport_dump_dev_state(
703 struct se_device *dev,
707 *bl += sprintf(b + *bl, "Status: ");
708 if (dev->export_count)
709 *bl += sprintf(b + *bl, "ACTIVATED");
711 *bl += sprintf(b + *bl, "DEACTIVATED");
713 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
714 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
715 dev->dev_attrib.block_size,
716 dev->dev_attrib.hw_max_sectors);
717 *bl += sprintf(b + *bl, " ");
720 void transport_dump_vpd_proto_id(
722 unsigned char *p_buf,
725 unsigned char buf[VPD_TMP_BUF_SIZE];
728 memset(buf, 0, VPD_TMP_BUF_SIZE);
729 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
731 switch (vpd->protocol_identifier) {
733 sprintf(buf+len, "Fibre Channel\n");
736 sprintf(buf+len, "Parallel SCSI\n");
739 sprintf(buf+len, "SSA\n");
742 sprintf(buf+len, "IEEE 1394\n");
745 sprintf(buf+len, "SCSI Remote Direct Memory Access"
749 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
752 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
755 sprintf(buf+len, "Automation/Drive Interface Transport"
759 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
762 sprintf(buf+len, "Unknown 0x%02x\n",
763 vpd->protocol_identifier);
768 strncpy(p_buf, buf, p_buf_len);
774 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
777 * Check if the Protocol Identifier Valid (PIV) bit is set..
779 * from spc3r23.pdf section 7.5.1
781 if (page_83[1] & 0x80) {
782 vpd->protocol_identifier = (page_83[0] & 0xf0);
783 vpd->protocol_identifier_set = 1;
784 transport_dump_vpd_proto_id(vpd, NULL, 0);
787 EXPORT_SYMBOL(transport_set_vpd_proto_id);
789 int transport_dump_vpd_assoc(
791 unsigned char *p_buf,
794 unsigned char buf[VPD_TMP_BUF_SIZE];
798 memset(buf, 0, VPD_TMP_BUF_SIZE);
799 len = sprintf(buf, "T10 VPD Identifier Association: ");
801 switch (vpd->association) {
803 sprintf(buf+len, "addressed logical unit\n");
806 sprintf(buf+len, "target port\n");
809 sprintf(buf+len, "SCSI target device\n");
812 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
818 strncpy(p_buf, buf, p_buf_len);
825 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
828 * The VPD identification association..
830 * from spc3r23.pdf Section 7.6.3.1 Table 297
832 vpd->association = (page_83[1] & 0x30);
833 return transport_dump_vpd_assoc(vpd, NULL, 0);
835 EXPORT_SYMBOL(transport_set_vpd_assoc);
837 int transport_dump_vpd_ident_type(
839 unsigned char *p_buf,
842 unsigned char buf[VPD_TMP_BUF_SIZE];
846 memset(buf, 0, VPD_TMP_BUF_SIZE);
847 len = sprintf(buf, "T10 VPD Identifier Type: ");
849 switch (vpd->device_identifier_type) {
851 sprintf(buf+len, "Vendor specific\n");
854 sprintf(buf+len, "T10 Vendor ID based\n");
857 sprintf(buf+len, "EUI-64 based\n");
860 sprintf(buf+len, "NAA\n");
863 sprintf(buf+len, "Relative target port identifier\n");
866 sprintf(buf+len, "SCSI name string\n");
869 sprintf(buf+len, "Unsupported: 0x%02x\n",
870 vpd->device_identifier_type);
876 if (p_buf_len < strlen(buf)+1)
878 strncpy(p_buf, buf, p_buf_len);
886 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
889 * The VPD identifier type..
891 * from spc3r23.pdf Section 7.6.3.1 Table 298
893 vpd->device_identifier_type = (page_83[1] & 0x0f);
894 return transport_dump_vpd_ident_type(vpd, NULL, 0);
896 EXPORT_SYMBOL(transport_set_vpd_ident_type);
898 int transport_dump_vpd_ident(
900 unsigned char *p_buf,
903 unsigned char buf[VPD_TMP_BUF_SIZE];
906 memset(buf, 0, VPD_TMP_BUF_SIZE);
908 switch (vpd->device_identifier_code_set) {
909 case 0x01: /* Binary */
910 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
911 &vpd->device_identifier[0]);
913 case 0x02: /* ASCII */
914 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
915 &vpd->device_identifier[0]);
917 case 0x03: /* UTF-8 */
918 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
919 &vpd->device_identifier[0]);
922 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
923 " 0x%02x", vpd->device_identifier_code_set);
929 strncpy(p_buf, buf, p_buf_len);
937 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
939 static const char hex_str[] = "0123456789abcdef";
940 int j = 0, i = 4; /* offset to start of the identifier */
943 * The VPD Code Set (encoding)
945 * from spc3r23.pdf Section 7.6.3.1 Table 296
947 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
948 switch (vpd->device_identifier_code_set) {
949 case 0x01: /* Binary */
950 vpd->device_identifier[j++] =
951 hex_str[vpd->device_identifier_type];
952 while (i < (4 + page_83[3])) {
953 vpd->device_identifier[j++] =
954 hex_str[(page_83[i] & 0xf0) >> 4];
955 vpd->device_identifier[j++] =
956 hex_str[page_83[i] & 0x0f];
960 case 0x02: /* ASCII */
961 case 0x03: /* UTF-8 */
962 while (i < (4 + page_83[3]))
963 vpd->device_identifier[j++] = page_83[i++];
969 return transport_dump_vpd_ident(vpd, NULL, 0);
971 EXPORT_SYMBOL(transport_set_vpd_ident);
974 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
976 struct se_device *dev = cmd->se_dev;
978 if (cmd->unknown_data_length) {
979 cmd->data_length = size;
980 } else if (size != cmd->data_length) {
981 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
982 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
983 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
984 cmd->data_length, size, cmd->t_task_cdb[0]);
986 if (cmd->data_direction == DMA_TO_DEVICE) {
987 pr_err("Rejecting underflow/overflow"
989 return TCM_INVALID_CDB_FIELD;
992 * Reject READ_* or WRITE_* with overflow/underflow for
993 * type SCF_SCSI_DATA_CDB.
995 if (dev->dev_attrib.block_size != 512) {
996 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
997 " CDB on non 512-byte sector setup subsystem"
998 " plugin: %s\n", dev->transport->name);
999 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1000 return TCM_INVALID_CDB_FIELD;
1003 * For the overflow case keep the existing fabric provided
1004 * ->data_length. Otherwise for the underflow case, reset
1005 * ->data_length to the smaller SCSI expected data transfer
1008 if (size > cmd->data_length) {
1009 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1010 cmd->residual_count = (size - cmd->data_length);
1012 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1013 cmd->residual_count = (cmd->data_length - size);
1014 cmd->data_length = size;
1023 * Used by fabric modules containing a local struct se_cmd within their
1024 * fabric dependent per I/O descriptor.
1026 void transport_init_se_cmd(
1028 struct target_core_fabric_ops *tfo,
1029 struct se_session *se_sess,
1033 unsigned char *sense_buffer)
1035 INIT_LIST_HEAD(&cmd->se_lun_node);
1036 INIT_LIST_HEAD(&cmd->se_delayed_node);
1037 INIT_LIST_HEAD(&cmd->se_qf_node);
1038 INIT_LIST_HEAD(&cmd->se_cmd_list);
1039 INIT_LIST_HEAD(&cmd->state_list);
1040 init_completion(&cmd->transport_lun_fe_stop_comp);
1041 init_completion(&cmd->transport_lun_stop_comp);
1042 init_completion(&cmd->t_transport_stop_comp);
1043 init_completion(&cmd->cmd_wait_comp);
1044 init_completion(&cmd->task_stop_comp);
1045 spin_lock_init(&cmd->t_state_lock);
1046 cmd->transport_state = CMD_T_DEV_ACTIVE;
1049 cmd->se_sess = se_sess;
1050 cmd->data_length = data_length;
1051 cmd->data_direction = data_direction;
1052 cmd->sam_task_attr = task_attr;
1053 cmd->sense_buffer = sense_buffer;
1055 cmd->state_active = false;
1057 EXPORT_SYMBOL(transport_init_se_cmd);
1059 static sense_reason_t
1060 transport_check_alloc_task_attr(struct se_cmd *cmd)
1062 struct se_device *dev = cmd->se_dev;
1065 * Check if SAM Task Attribute emulation is enabled for this
1066 * struct se_device storage object
1068 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1071 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1072 pr_debug("SAM Task Attribute ACA"
1073 " emulation is not supported\n");
1074 return TCM_INVALID_CDB_FIELD;
1077 * Used to determine when ORDERED commands should go from
1078 * Dormant to Active status.
1080 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1081 smp_mb__after_atomic_inc();
1082 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1083 cmd->se_ordered_id, cmd->sam_task_attr,
1084 dev->transport->name);
1089 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1091 struct se_device *dev = cmd->se_dev;
1092 unsigned long flags;
1096 * Ensure that the received CDB is less than the max (252 + 8) bytes
1097 * for VARIABLE_LENGTH_CMD
1099 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1100 pr_err("Received SCSI CDB with command_size: %d that"
1101 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1102 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1103 return TCM_INVALID_CDB_FIELD;
1106 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1107 * allocate the additional extended CDB buffer now.. Otherwise
1108 * setup the pointer from __t_task_cdb to t_task_cdb.
1110 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1111 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1113 if (!cmd->t_task_cdb) {
1114 pr_err("Unable to allocate cmd->t_task_cdb"
1115 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1116 scsi_command_size(cdb),
1117 (unsigned long)sizeof(cmd->__t_task_cdb));
1118 return TCM_OUT_OF_RESOURCES;
1121 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1123 * Copy the original CDB into cmd->
1125 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1128 * Check for an existing UNIT ATTENTION condition
1130 ret = target_scsi3_ua_check(cmd);
1134 ret = target_alua_state_check(cmd);
1138 ret = target_check_reservation(cmd);
1142 ret = dev->transport->parse_cdb(cmd);
1146 ret = transport_check_alloc_task_attr(cmd);
1150 spin_lock_irqsave(&cmd->t_state_lock, flags);
1151 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1152 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1154 spin_lock(&cmd->se_lun->lun_sep_lock);
1155 if (cmd->se_lun->lun_sep)
1156 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1157 spin_unlock(&cmd->se_lun->lun_sep_lock);
1160 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1163 * Used by fabric module frontends to queue tasks directly.
1164 * Many only be used from process context only
1166 int transport_handle_cdb_direct(
1173 pr_err("cmd->se_lun is NULL\n");
1176 if (in_interrupt()) {
1178 pr_err("transport_generic_handle_cdb cannot be called"
1179 " from interrupt context\n");
1183 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1184 * outstanding descriptors are handled correctly during shutdown via
1185 * transport_wait_for_tasks()
1187 * Also, we don't take cmd->t_state_lock here as we only expect
1188 * this to be called for initial descriptor submission.
1190 cmd->t_state = TRANSPORT_NEW_CMD;
1191 cmd->transport_state |= CMD_T_ACTIVE;
1194 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1195 * so follow TRANSPORT_NEW_CMD processing thread context usage
1196 * and call transport_generic_request_failure() if necessary..
1198 ret = transport_generic_new_cmd(cmd);
1200 transport_generic_request_failure(cmd, ret);
1203 EXPORT_SYMBOL(transport_handle_cdb_direct);
1205 static sense_reason_t
1206 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1207 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1209 if (!sgl || !sgl_count)
1213 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1214 * scatterlists already have been set to follow what the fabric
1215 * passes for the original expected data transfer length.
1217 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1218 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1219 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1220 return TCM_INVALID_CDB_FIELD;
1223 cmd->t_data_sg = sgl;
1224 cmd->t_data_nents = sgl_count;
1226 if (sgl_bidi && sgl_bidi_count) {
1227 cmd->t_bidi_data_sg = sgl_bidi;
1228 cmd->t_bidi_data_nents = sgl_bidi_count;
1230 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1235 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1236 * se_cmd + use pre-allocated SGL memory.
1238 * @se_cmd: command descriptor to submit
1239 * @se_sess: associated se_sess for endpoint
1240 * @cdb: pointer to SCSI CDB
1241 * @sense: pointer to SCSI sense buffer
1242 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1243 * @data_length: fabric expected data transfer length
1244 * @task_addr: SAM task attribute
1245 * @data_dir: DMA data direction
1246 * @flags: flags for command submission from target_sc_flags_tables
1247 * @sgl: struct scatterlist memory for unidirectional mapping
1248 * @sgl_count: scatterlist count for unidirectional mapping
1249 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1250 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1252 * Returns non zero to signal active I/O shutdown failure. All other
1253 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1254 * but still return zero here.
1256 * This may only be called from process context, and also currently
1257 * assumes internal allocation of fabric payload buffer by target-core.
1259 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1260 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1261 u32 data_length, int task_attr, int data_dir, int flags,
1262 struct scatterlist *sgl, u32 sgl_count,
1263 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1265 struct se_portal_group *se_tpg;
1269 se_tpg = se_sess->se_tpg;
1271 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1272 BUG_ON(in_interrupt());
1274 * Initialize se_cmd for target operation. From this point
1275 * exceptions are handled by sending exception status via
1276 * target_core_fabric_ops->queue_status() callback
1278 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1279 data_length, data_dir, task_attr, sense);
1280 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1281 se_cmd->unknown_data_length = 1;
1283 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1284 * se_sess->sess_cmd_list. A second kref_get here is necessary
1285 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1286 * kref_put() to happen during fabric packet acknowledgement.
1288 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1292 * Signal bidirectional data payloads to target-core
1294 if (flags & TARGET_SCF_BIDI_OP)
1295 se_cmd->se_cmd_flags |= SCF_BIDI;
1297 * Locate se_lun pointer and attach it to struct se_cmd
1299 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1301 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1302 target_put_sess_cmd(se_sess, se_cmd);
1306 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1308 transport_generic_request_failure(se_cmd, rc);
1312 * When a non zero sgl_count has been passed perform SGL passthrough
1313 * mapping for pre-allocated fabric memory instead of having target
1314 * core perform an internal SGL allocation..
1316 if (sgl_count != 0) {
1320 * A work-around for tcm_loop as some userspace code via
1321 * scsi-generic do not memset their associated read buffers,
1322 * so go ahead and do that here for type non-data CDBs. Also
1323 * note that this is currently guaranteed to be a single SGL
1324 * for this case by target core in target_setup_cmd_from_cdb()
1325 * -> transport_generic_cmd_sequencer().
1327 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1328 se_cmd->data_direction == DMA_FROM_DEVICE) {
1329 unsigned char *buf = NULL;
1332 buf = kmap(sg_page(sgl)) + sgl->offset;
1335 memset(buf, 0, sgl->length);
1336 kunmap(sg_page(sgl));
1340 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1341 sgl_bidi, sgl_bidi_count);
1343 transport_generic_request_failure(se_cmd, rc);
1348 * Check if we need to delay processing because of ALUA
1349 * Active/NonOptimized primary access state..
1351 core_alua_check_nonop_delay(se_cmd);
1353 transport_handle_cdb_direct(se_cmd);
1356 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1359 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1361 * @se_cmd: command descriptor to submit
1362 * @se_sess: associated se_sess for endpoint
1363 * @cdb: pointer to SCSI CDB
1364 * @sense: pointer to SCSI sense buffer
1365 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1366 * @data_length: fabric expected data transfer length
1367 * @task_addr: SAM task attribute
1368 * @data_dir: DMA data direction
1369 * @flags: flags for command submission from target_sc_flags_tables
1371 * Returns non zero to signal active I/O shutdown failure. All other
1372 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1373 * but still return zero here.
1375 * This may only be called from process context, and also currently
1376 * assumes internal allocation of fabric payload buffer by target-core.
1378 * It also assumes interal target core SGL memory allocation.
1380 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1381 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1382 u32 data_length, int task_attr, int data_dir, int flags)
1384 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1385 unpacked_lun, data_length, task_attr, data_dir,
1386 flags, NULL, 0, NULL, 0);
1388 EXPORT_SYMBOL(target_submit_cmd);
1390 static void target_complete_tmr_failure(struct work_struct *work)
1392 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1394 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1395 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1399 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1402 * @se_cmd: command descriptor to submit
1403 * @se_sess: associated se_sess for endpoint
1404 * @sense: pointer to SCSI sense buffer
1405 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1406 * @fabric_context: fabric context for TMR req
1407 * @tm_type: Type of TM request
1408 * @gfp: gfp type for caller
1409 * @tag: referenced task tag for TMR_ABORT_TASK
1410 * @flags: submit cmd flags
1412 * Callable from all contexts.
1415 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1416 unsigned char *sense, u32 unpacked_lun,
1417 void *fabric_tmr_ptr, unsigned char tm_type,
1418 gfp_t gfp, unsigned int tag, int flags)
1420 struct se_portal_group *se_tpg;
1423 se_tpg = se_sess->se_tpg;
1426 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1427 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1429 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1430 * allocation failure.
1432 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1436 if (tm_type == TMR_ABORT_TASK)
1437 se_cmd->se_tmr_req->ref_task_tag = tag;
1439 /* See target_submit_cmd for commentary */
1440 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1442 core_tmr_release_req(se_cmd->se_tmr_req);
1446 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1449 * For callback during failure handling, push this work off
1450 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1452 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1453 schedule_work(&se_cmd->work);
1456 transport_generic_handle_tmr(se_cmd);
1459 EXPORT_SYMBOL(target_submit_tmr);
1462 * If the cmd is active, request it to be stopped and sleep until it
1465 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1467 bool was_active = false;
1469 if (cmd->transport_state & CMD_T_BUSY) {
1470 cmd->transport_state |= CMD_T_REQUEST_STOP;
1471 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1473 pr_debug("cmd %p waiting to complete\n", cmd);
1474 wait_for_completion(&cmd->task_stop_comp);
1475 pr_debug("cmd %p stopped successfully\n", cmd);
1477 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1478 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1479 cmd->transport_state &= ~CMD_T_BUSY;
1487 * Handle SAM-esque emulation for generic transport request failures.
1489 void transport_generic_request_failure(struct se_cmd *cmd,
1490 sense_reason_t sense_reason)
1494 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1495 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1496 cmd->t_task_cdb[0]);
1497 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1498 cmd->se_tfo->get_cmd_state(cmd),
1499 cmd->t_state, sense_reason);
1500 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1501 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1502 (cmd->transport_state & CMD_T_STOP) != 0,
1503 (cmd->transport_state & CMD_T_SENT) != 0);
1506 * For SAM Task Attribute emulation for failed struct se_cmd
1508 transport_complete_task_attr(cmd);
1510 switch (sense_reason) {
1511 case TCM_NON_EXISTENT_LUN:
1512 case TCM_UNSUPPORTED_SCSI_OPCODE:
1513 case TCM_INVALID_CDB_FIELD:
1514 case TCM_INVALID_PARAMETER_LIST:
1515 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1516 case TCM_UNKNOWN_MODE_PAGE:
1517 case TCM_WRITE_PROTECTED:
1518 case TCM_ADDRESS_OUT_OF_RANGE:
1519 case TCM_CHECK_CONDITION_ABORT_CMD:
1520 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1521 case TCM_CHECK_CONDITION_NOT_READY:
1523 case TCM_OUT_OF_RESOURCES:
1524 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1526 case TCM_RESERVATION_CONFLICT:
1528 * No SENSE Data payload for this case, set SCSI Status
1529 * and queue the response to $FABRIC_MOD.
1531 * Uses linux/include/scsi/scsi.h SAM status codes defs
1533 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1535 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1536 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1539 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1542 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1543 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1544 cmd->orig_fe_lun, 0x2C,
1545 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1547 ret = cmd->se_tfo->queue_status(cmd);
1548 if (ret == -EAGAIN || ret == -ENOMEM)
1552 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1553 cmd->t_task_cdb[0], sense_reason);
1554 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1558 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1559 if (ret == -EAGAIN || ret == -ENOMEM)
1563 transport_lun_remove_cmd(cmd);
1564 if (!transport_cmd_check_stop_to_fabric(cmd))
1569 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1570 transport_handle_queue_full(cmd, cmd->se_dev);
1572 EXPORT_SYMBOL(transport_generic_request_failure);
1574 static void __target_execute_cmd(struct se_cmd *cmd)
1578 spin_lock_irq(&cmd->t_state_lock);
1579 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1580 spin_unlock_irq(&cmd->t_state_lock);
1582 if (cmd->execute_cmd) {
1583 ret = cmd->execute_cmd(cmd);
1585 spin_lock_irq(&cmd->t_state_lock);
1586 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1587 spin_unlock_irq(&cmd->t_state_lock);
1589 transport_generic_request_failure(cmd, ret);
1594 static bool target_handle_task_attr(struct se_cmd *cmd)
1596 struct se_device *dev = cmd->se_dev;
1598 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1602 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1603 * to allow the passed struct se_cmd list of tasks to the front of the list.
1605 switch (cmd->sam_task_attr) {
1607 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1608 "se_ordered_id: %u\n",
1609 cmd->t_task_cdb[0], cmd->se_ordered_id);
1611 case MSG_ORDERED_TAG:
1612 atomic_inc(&dev->dev_ordered_sync);
1613 smp_mb__after_atomic_inc();
1615 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1616 " se_ordered_id: %u\n",
1617 cmd->t_task_cdb[0], cmd->se_ordered_id);
1620 * Execute an ORDERED command if no other older commands
1621 * exist that need to be completed first.
1623 if (!atomic_read(&dev->simple_cmds))
1628 * For SIMPLE and UNTAGGED Task Attribute commands
1630 atomic_inc(&dev->simple_cmds);
1631 smp_mb__after_atomic_inc();
1635 if (atomic_read(&dev->dev_ordered_sync) == 0)
1638 spin_lock(&dev->delayed_cmd_lock);
1639 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1640 spin_unlock(&dev->delayed_cmd_lock);
1642 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1643 " delayed CMD list, se_ordered_id: %u\n",
1644 cmd->t_task_cdb[0], cmd->sam_task_attr,
1645 cmd->se_ordered_id);
1649 void target_execute_cmd(struct se_cmd *cmd)
1652 * If the received CDB has aleady been aborted stop processing it here.
1654 if (transport_check_aborted_status(cmd, 1)) {
1655 complete(&cmd->transport_lun_stop_comp);
1660 * Determine if IOCTL context caller in requesting the stopping of this
1661 * command for LUN shutdown purposes.
1663 spin_lock_irq(&cmd->t_state_lock);
1664 if (cmd->transport_state & CMD_T_LUN_STOP) {
1665 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1666 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1668 cmd->transport_state &= ~CMD_T_ACTIVE;
1669 spin_unlock_irq(&cmd->t_state_lock);
1670 complete(&cmd->transport_lun_stop_comp);
1674 * Determine if frontend context caller is requesting the stopping of
1675 * this command for frontend exceptions.
1677 if (cmd->transport_state & CMD_T_STOP) {
1678 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1680 cmd->se_tfo->get_task_tag(cmd));
1682 spin_unlock_irq(&cmd->t_state_lock);
1683 complete(&cmd->t_transport_stop_comp);
1687 cmd->t_state = TRANSPORT_PROCESSING;
1688 cmd->transport_state |= CMD_T_ACTIVE;
1689 spin_unlock_irq(&cmd->t_state_lock);
1691 if (!target_handle_task_attr(cmd))
1692 __target_execute_cmd(cmd);
1694 EXPORT_SYMBOL(target_execute_cmd);
1697 * Process all commands up to the last received ORDERED task attribute which
1698 * requires another blocking boundary
1700 static void target_restart_delayed_cmds(struct se_device *dev)
1705 spin_lock(&dev->delayed_cmd_lock);
1706 if (list_empty(&dev->delayed_cmd_list)) {
1707 spin_unlock(&dev->delayed_cmd_lock);
1711 cmd = list_entry(dev->delayed_cmd_list.next,
1712 struct se_cmd, se_delayed_node);
1713 list_del(&cmd->se_delayed_node);
1714 spin_unlock(&dev->delayed_cmd_lock);
1716 __target_execute_cmd(cmd);
1718 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1724 * Called from I/O completion to determine which dormant/delayed
1725 * and ordered cmds need to have their tasks added to the execution queue.
1727 static void transport_complete_task_attr(struct se_cmd *cmd)
1729 struct se_device *dev = cmd->se_dev;
1731 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1734 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1735 atomic_dec(&dev->simple_cmds);
1736 smp_mb__after_atomic_dec();
1737 dev->dev_cur_ordered_id++;
1738 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1739 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1740 cmd->se_ordered_id);
1741 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1742 dev->dev_cur_ordered_id++;
1743 pr_debug("Incremented dev_cur_ordered_id: %u for"
1744 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1745 cmd->se_ordered_id);
1746 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1747 atomic_dec(&dev->dev_ordered_sync);
1748 smp_mb__after_atomic_dec();
1750 dev->dev_cur_ordered_id++;
1751 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1752 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1755 target_restart_delayed_cmds(dev);
1758 static void transport_complete_qf(struct se_cmd *cmd)
1762 transport_complete_task_attr(cmd);
1764 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1765 ret = cmd->se_tfo->queue_status(cmd);
1770 switch (cmd->data_direction) {
1771 case DMA_FROM_DEVICE:
1772 ret = cmd->se_tfo->queue_data_in(cmd);
1775 if (cmd->t_bidi_data_sg) {
1776 ret = cmd->se_tfo->queue_data_in(cmd);
1780 /* Fall through for DMA_TO_DEVICE */
1782 ret = cmd->se_tfo->queue_status(cmd);
1790 transport_handle_queue_full(cmd, cmd->se_dev);
1793 transport_lun_remove_cmd(cmd);
1794 transport_cmd_check_stop_to_fabric(cmd);
1797 static void transport_handle_queue_full(
1799 struct se_device *dev)
1801 spin_lock_irq(&dev->qf_cmd_lock);
1802 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1803 atomic_inc(&dev->dev_qf_count);
1804 smp_mb__after_atomic_inc();
1805 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1807 schedule_work(&cmd->se_dev->qf_work_queue);
1810 static void target_complete_ok_work(struct work_struct *work)
1812 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1816 * Check if we need to move delayed/dormant tasks from cmds on the
1817 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1820 transport_complete_task_attr(cmd);
1823 * Check to schedule QUEUE_FULL work, or execute an existing
1824 * cmd->transport_qf_callback()
1826 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1827 schedule_work(&cmd->se_dev->qf_work_queue);
1830 * Check if we need to send a sense buffer from
1831 * the struct se_cmd in question.
1833 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1834 WARN_ON(!cmd->scsi_status);
1835 ret = transport_send_check_condition_and_sense(
1837 if (ret == -EAGAIN || ret == -ENOMEM)
1840 transport_lun_remove_cmd(cmd);
1841 transport_cmd_check_stop_to_fabric(cmd);
1845 * Check for a callback, used by amongst other things
1846 * XDWRITE_READ_10 emulation.
1848 if (cmd->transport_complete_callback)
1849 cmd->transport_complete_callback(cmd);
1851 switch (cmd->data_direction) {
1852 case DMA_FROM_DEVICE:
1853 spin_lock(&cmd->se_lun->lun_sep_lock);
1854 if (cmd->se_lun->lun_sep) {
1855 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1858 spin_unlock(&cmd->se_lun->lun_sep_lock);
1860 ret = cmd->se_tfo->queue_data_in(cmd);
1861 if (ret == -EAGAIN || ret == -ENOMEM)
1865 spin_lock(&cmd->se_lun->lun_sep_lock);
1866 if (cmd->se_lun->lun_sep) {
1867 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
1870 spin_unlock(&cmd->se_lun->lun_sep_lock);
1872 * Check if we need to send READ payload for BIDI-COMMAND
1874 if (cmd->t_bidi_data_sg) {
1875 spin_lock(&cmd->se_lun->lun_sep_lock);
1876 if (cmd->se_lun->lun_sep) {
1877 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1880 spin_unlock(&cmd->se_lun->lun_sep_lock);
1881 ret = cmd->se_tfo->queue_data_in(cmd);
1882 if (ret == -EAGAIN || ret == -ENOMEM)
1886 /* Fall through for DMA_TO_DEVICE */
1888 ret = cmd->se_tfo->queue_status(cmd);
1889 if (ret == -EAGAIN || ret == -ENOMEM)
1896 transport_lun_remove_cmd(cmd);
1897 transport_cmd_check_stop_to_fabric(cmd);
1901 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
1902 " data_direction: %d\n", cmd, cmd->data_direction);
1903 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1904 transport_handle_queue_full(cmd, cmd->se_dev);
1907 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
1909 struct scatterlist *sg;
1912 for_each_sg(sgl, sg, nents, count)
1913 __free_page(sg_page(sg));
1918 static inline void transport_free_pages(struct se_cmd *cmd)
1920 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
1923 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
1924 cmd->t_data_sg = NULL;
1925 cmd->t_data_nents = 0;
1927 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
1928 cmd->t_bidi_data_sg = NULL;
1929 cmd->t_bidi_data_nents = 0;
1933 * transport_release_cmd - free a command
1934 * @cmd: command to free
1936 * This routine unconditionally frees a command, and reference counting
1937 * or list removal must be done in the caller.
1939 static void transport_release_cmd(struct se_cmd *cmd)
1941 BUG_ON(!cmd->se_tfo);
1943 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
1944 core_tmr_release_req(cmd->se_tmr_req);
1945 if (cmd->t_task_cdb != cmd->__t_task_cdb)
1946 kfree(cmd->t_task_cdb);
1948 * If this cmd has been setup with target_get_sess_cmd(), drop
1949 * the kref and call ->release_cmd() in kref callback.
1951 if (cmd->check_release != 0) {
1952 target_put_sess_cmd(cmd->se_sess, cmd);
1955 cmd->se_tfo->release_cmd(cmd);
1959 * transport_put_cmd - release a reference to a command
1960 * @cmd: command to release
1962 * This routine releases our reference to the command and frees it if possible.
1964 static void transport_put_cmd(struct se_cmd *cmd)
1966 unsigned long flags;
1968 spin_lock_irqsave(&cmd->t_state_lock, flags);
1969 if (atomic_read(&cmd->t_fe_count) &&
1970 !atomic_dec_and_test(&cmd->t_fe_count)) {
1971 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1975 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
1976 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
1977 target_remove_from_state_list(cmd);
1979 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1981 transport_free_pages(cmd);
1982 transport_release_cmd(cmd);
1986 void *transport_kmap_data_sg(struct se_cmd *cmd)
1988 struct scatterlist *sg = cmd->t_data_sg;
1989 struct page **pages;
1993 * We need to take into account a possible offset here for fabrics like
1994 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
1995 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
1997 if (!cmd->t_data_nents)
2001 if (cmd->t_data_nents == 1)
2002 return kmap(sg_page(sg)) + sg->offset;
2004 /* >1 page. use vmap */
2005 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2009 /* convert sg[] to pages[] */
2010 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2011 pages[i] = sg_page(sg);
2014 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2016 if (!cmd->t_data_vmap)
2019 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2021 EXPORT_SYMBOL(transport_kmap_data_sg);
2023 void transport_kunmap_data_sg(struct se_cmd *cmd)
2025 if (!cmd->t_data_nents) {
2027 } else if (cmd->t_data_nents == 1) {
2028 kunmap(sg_page(cmd->t_data_sg));
2032 vunmap(cmd->t_data_vmap);
2033 cmd->t_data_vmap = NULL;
2035 EXPORT_SYMBOL(transport_kunmap_data_sg);
2038 transport_generic_get_mem(struct se_cmd *cmd)
2040 u32 length = cmd->data_length;
2046 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2047 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2048 if (!cmd->t_data_sg)
2051 cmd->t_data_nents = nents;
2052 sg_init_table(cmd->t_data_sg, nents);
2054 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2057 u32 page_len = min_t(u32, length, PAGE_SIZE);
2058 page = alloc_page(GFP_KERNEL | zero_flag);
2062 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2071 __free_page(sg_page(&cmd->t_data_sg[i]));
2073 kfree(cmd->t_data_sg);
2074 cmd->t_data_sg = NULL;
2079 * Allocate any required resources to execute the command. For writes we
2080 * might not have the payload yet, so notify the fabric via a call to
2081 * ->write_pending instead. Otherwise place it on the execution queue.
2084 transport_generic_new_cmd(struct se_cmd *cmd)
2089 * Determine is the TCM fabric module has already allocated physical
2090 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2093 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2095 ret = transport_generic_get_mem(cmd);
2097 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2100 atomic_inc(&cmd->t_fe_count);
2103 * If this command is not a write we can execute it right here,
2104 * for write buffers we need to notify the fabric driver first
2105 * and let it call back once the write buffers are ready.
2107 target_add_to_state_list(cmd);
2108 if (cmd->data_direction != DMA_TO_DEVICE) {
2109 target_execute_cmd(cmd);
2113 spin_lock_irq(&cmd->t_state_lock);
2114 cmd->t_state = TRANSPORT_WRITE_PENDING;
2115 spin_unlock_irq(&cmd->t_state_lock);
2117 transport_cmd_check_stop(cmd, false);
2119 ret = cmd->se_tfo->write_pending(cmd);
2120 if (ret == -EAGAIN || ret == -ENOMEM)
2123 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2126 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2129 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2130 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2131 transport_handle_queue_full(cmd, cmd->se_dev);
2134 EXPORT_SYMBOL(transport_generic_new_cmd);
2136 static void transport_write_pending_qf(struct se_cmd *cmd)
2140 ret = cmd->se_tfo->write_pending(cmd);
2141 if (ret == -EAGAIN || ret == -ENOMEM) {
2142 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2144 transport_handle_queue_full(cmd, cmd->se_dev);
2148 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2150 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2151 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2152 transport_wait_for_tasks(cmd);
2154 transport_release_cmd(cmd);
2157 transport_wait_for_tasks(cmd);
2159 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2162 transport_lun_remove_cmd(cmd);
2164 transport_put_cmd(cmd);
2167 EXPORT_SYMBOL(transport_generic_free_cmd);
2169 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2170 * @se_sess: session to reference
2171 * @se_cmd: command descriptor to add
2172 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2174 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2177 unsigned long flags;
2180 kref_init(&se_cmd->cmd_kref);
2182 * Add a second kref if the fabric caller is expecting to handle
2183 * fabric acknowledgement that requires two target_put_sess_cmd()
2184 * invocations before se_cmd descriptor release.
2186 if (ack_kref == true) {
2187 kref_get(&se_cmd->cmd_kref);
2188 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2191 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2192 if (se_sess->sess_tearing_down) {
2196 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2197 se_cmd->check_release = 1;
2200 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2204 static void target_release_cmd_kref(struct kref *kref)
2206 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2207 struct se_session *se_sess = se_cmd->se_sess;
2208 unsigned long flags;
2210 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2211 if (list_empty(&se_cmd->se_cmd_list)) {
2212 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2213 se_cmd->se_tfo->release_cmd(se_cmd);
2216 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2217 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2218 complete(&se_cmd->cmd_wait_comp);
2221 list_del(&se_cmd->se_cmd_list);
2222 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2224 se_cmd->se_tfo->release_cmd(se_cmd);
2227 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2228 * @se_sess: session to reference
2229 * @se_cmd: command descriptor to drop
2231 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2233 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2235 EXPORT_SYMBOL(target_put_sess_cmd);
2237 /* target_sess_cmd_list_set_waiting - Flag all commands in
2238 * sess_cmd_list to complete cmd_wait_comp. Set
2239 * sess_tearing_down so no more commands are queued.
2240 * @se_sess: session to flag
2242 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2244 struct se_cmd *se_cmd;
2245 unsigned long flags;
2247 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2249 WARN_ON(se_sess->sess_tearing_down);
2250 se_sess->sess_tearing_down = 1;
2252 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2253 se_cmd->cmd_wait_set = 1;
2255 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2257 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2259 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2260 * @se_sess: session to wait for active I/O
2261 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2263 void target_wait_for_sess_cmds(
2264 struct se_session *se_sess,
2267 struct se_cmd *se_cmd, *tmp_cmd;
2270 list_for_each_entry_safe(se_cmd, tmp_cmd,
2271 &se_sess->sess_cmd_list, se_cmd_list) {
2272 list_del(&se_cmd->se_cmd_list);
2274 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2275 " %d\n", se_cmd, se_cmd->t_state,
2276 se_cmd->se_tfo->get_cmd_state(se_cmd));
2278 if (wait_for_tasks) {
2279 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2280 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2281 se_cmd->se_tfo->get_cmd_state(se_cmd));
2283 rc = transport_wait_for_tasks(se_cmd);
2285 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2286 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2287 se_cmd->se_tfo->get_cmd_state(se_cmd));
2291 wait_for_completion(&se_cmd->cmd_wait_comp);
2292 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2293 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2294 se_cmd->se_tfo->get_cmd_state(se_cmd));
2297 se_cmd->se_tfo->release_cmd(se_cmd);
2300 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2302 /* transport_lun_wait_for_tasks():
2304 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2305 * an struct se_lun to be successfully shutdown.
2307 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2309 unsigned long flags;
2313 * If the frontend has already requested this struct se_cmd to
2314 * be stopped, we can safely ignore this struct se_cmd.
2316 spin_lock_irqsave(&cmd->t_state_lock, flags);
2317 if (cmd->transport_state & CMD_T_STOP) {
2318 cmd->transport_state &= ~CMD_T_LUN_STOP;
2320 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2321 cmd->se_tfo->get_task_tag(cmd));
2322 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2323 transport_cmd_check_stop(cmd, false);
2326 cmd->transport_state |= CMD_T_LUN_FE_STOP;
2327 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2329 // XXX: audit task_flags checks.
2330 spin_lock_irqsave(&cmd->t_state_lock, flags);
2331 if ((cmd->transport_state & CMD_T_BUSY) &&
2332 (cmd->transport_state & CMD_T_SENT)) {
2333 if (!target_stop_cmd(cmd, &flags))
2336 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2338 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2341 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2342 cmd->se_tfo->get_task_tag(cmd));
2343 wait_for_completion(&cmd->transport_lun_stop_comp);
2344 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2345 cmd->se_tfo->get_task_tag(cmd));
2351 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2353 struct se_cmd *cmd = NULL;
2354 unsigned long lun_flags, cmd_flags;
2356 * Do exception processing and return CHECK_CONDITION status to the
2359 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2360 while (!list_empty(&lun->lun_cmd_list)) {
2361 cmd = list_first_entry(&lun->lun_cmd_list,
2362 struct se_cmd, se_lun_node);
2363 list_del_init(&cmd->se_lun_node);
2365 spin_lock(&cmd->t_state_lock);
2366 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2367 "_lun_stop for ITT: 0x%08x\n",
2368 cmd->se_lun->unpacked_lun,
2369 cmd->se_tfo->get_task_tag(cmd));
2370 cmd->transport_state |= CMD_T_LUN_STOP;
2371 spin_unlock(&cmd->t_state_lock);
2373 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2376 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2377 cmd->se_tfo->get_task_tag(cmd),
2378 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2382 * If the Storage engine still owns the iscsi_cmd_t, determine
2383 * and/or stop its context.
2385 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2386 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2387 cmd->se_tfo->get_task_tag(cmd));
2389 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2390 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2394 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2395 "_wait_for_tasks(): SUCCESS\n",
2396 cmd->se_lun->unpacked_lun,
2397 cmd->se_tfo->get_task_tag(cmd));
2399 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2400 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2401 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2404 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2405 target_remove_from_state_list(cmd);
2406 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2409 * The Storage engine stopped this struct se_cmd before it was
2410 * send to the fabric frontend for delivery back to the
2411 * Initiator Node. Return this SCSI CDB back with an
2412 * CHECK_CONDITION status.
2415 transport_send_check_condition_and_sense(cmd,
2416 TCM_NON_EXISTENT_LUN, 0);
2418 * If the fabric frontend is waiting for this iscsi_cmd_t to
2419 * be released, notify the waiting thread now that LU has
2420 * finished accessing it.
2422 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2423 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2424 pr_debug("SE_LUN[%d] - Detected FE stop for"
2425 " struct se_cmd: %p ITT: 0x%08x\n",
2427 cmd, cmd->se_tfo->get_task_tag(cmd));
2429 spin_unlock_irqrestore(&cmd->t_state_lock,
2431 transport_cmd_check_stop(cmd, false);
2432 complete(&cmd->transport_lun_fe_stop_comp);
2433 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2436 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2437 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2439 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2440 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2442 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2445 static int transport_clear_lun_thread(void *p)
2447 struct se_lun *lun = p;
2449 __transport_clear_lun_from_sessions(lun);
2450 complete(&lun->lun_shutdown_comp);
2455 int transport_clear_lun_from_sessions(struct se_lun *lun)
2457 struct task_struct *kt;
2459 kt = kthread_run(transport_clear_lun_thread, lun,
2460 "tcm_cl_%u", lun->unpacked_lun);
2462 pr_err("Unable to start clear_lun thread\n");
2465 wait_for_completion(&lun->lun_shutdown_comp);
2471 * transport_wait_for_tasks - wait for completion to occur
2472 * @cmd: command to wait
2474 * Called from frontend fabric context to wait for storage engine
2475 * to pause and/or release frontend generated struct se_cmd.
2477 bool transport_wait_for_tasks(struct se_cmd *cmd)
2479 unsigned long flags;
2481 spin_lock_irqsave(&cmd->t_state_lock, flags);
2482 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2483 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2484 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2488 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2489 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2490 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2494 * If we are already stopped due to an external event (ie: LUN shutdown)
2495 * sleep until the connection can have the passed struct se_cmd back.
2496 * The cmd->transport_lun_stopped_sem will be upped by
2497 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2498 * has completed its operation on the struct se_cmd.
2500 if (cmd->transport_state & CMD_T_LUN_STOP) {
2501 pr_debug("wait_for_tasks: Stopping"
2502 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2503 "_stop_comp); for ITT: 0x%08x\n",
2504 cmd->se_tfo->get_task_tag(cmd));
2506 * There is a special case for WRITES where a FE exception +
2507 * LUN shutdown means ConfigFS context is still sleeping on
2508 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2509 * We go ahead and up transport_lun_stop_comp just to be sure
2512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2513 complete(&cmd->transport_lun_stop_comp);
2514 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2515 spin_lock_irqsave(&cmd->t_state_lock, flags);
2517 target_remove_from_state_list(cmd);
2519 * At this point, the frontend who was the originator of this
2520 * struct se_cmd, now owns the structure and can be released through
2521 * normal means below.
2523 pr_debug("wait_for_tasks: Stopped"
2524 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2525 "stop_comp); for ITT: 0x%08x\n",
2526 cmd->se_tfo->get_task_tag(cmd));
2528 cmd->transport_state &= ~CMD_T_LUN_STOP;
2531 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2532 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2536 cmd->transport_state |= CMD_T_STOP;
2538 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2539 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2540 cmd, cmd->se_tfo->get_task_tag(cmd),
2541 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2543 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2545 wait_for_completion(&cmd->t_transport_stop_comp);
2547 spin_lock_irqsave(&cmd->t_state_lock, flags);
2548 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2550 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2551 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2552 cmd->se_tfo->get_task_tag(cmd));
2554 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2558 EXPORT_SYMBOL(transport_wait_for_tasks);
2560 static int transport_get_sense_codes(
2565 *asc = cmd->scsi_asc;
2566 *ascq = cmd->scsi_ascq;
2572 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2573 sense_reason_t reason, int from_transport)
2575 unsigned char *buffer = cmd->sense_buffer;
2576 unsigned long flags;
2577 u8 asc = 0, ascq = 0;
2579 spin_lock_irqsave(&cmd->t_state_lock, flags);
2580 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2581 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2584 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2587 if (!reason && from_transport)
2590 if (!from_transport)
2591 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2594 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2595 * SENSE KEY values from include/scsi/scsi.h
2601 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2603 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2604 /* NO ADDITIONAL SENSE INFORMATION */
2605 buffer[SPC_ASC_KEY_OFFSET] = 0;
2606 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2608 case TCM_NON_EXISTENT_LUN:
2611 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2612 /* ILLEGAL REQUEST */
2613 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2614 /* LOGICAL UNIT NOT SUPPORTED */
2615 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2617 case TCM_UNSUPPORTED_SCSI_OPCODE:
2618 case TCM_SECTOR_COUNT_TOO_MANY:
2621 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2622 /* ILLEGAL REQUEST */
2623 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2624 /* INVALID COMMAND OPERATION CODE */
2625 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2627 case TCM_UNKNOWN_MODE_PAGE:
2630 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2631 /* ILLEGAL REQUEST */
2632 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2633 /* INVALID FIELD IN CDB */
2634 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2636 case TCM_CHECK_CONDITION_ABORT_CMD:
2639 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2640 /* ABORTED COMMAND */
2641 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2642 /* BUS DEVICE RESET FUNCTION OCCURRED */
2643 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2644 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2646 case TCM_INCORRECT_AMOUNT_OF_DATA:
2649 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2650 /* ABORTED COMMAND */
2651 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2653 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2654 /* NOT ENOUGH UNSOLICITED DATA */
2655 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2657 case TCM_INVALID_CDB_FIELD:
2660 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2661 /* ILLEGAL REQUEST */
2662 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2663 /* INVALID FIELD IN CDB */
2664 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2666 case TCM_INVALID_PARAMETER_LIST:
2669 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2670 /* ILLEGAL REQUEST */
2671 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2672 /* INVALID FIELD IN PARAMETER LIST */
2673 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2675 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2678 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2679 /* ABORTED COMMAND */
2680 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2682 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2683 /* UNEXPECTED_UNSOLICITED_DATA */
2684 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2686 case TCM_SERVICE_CRC_ERROR:
2689 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2690 /* ABORTED COMMAND */
2691 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2692 /* PROTOCOL SERVICE CRC ERROR */
2693 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2695 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2697 case TCM_SNACK_REJECTED:
2700 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2701 /* ABORTED COMMAND */
2702 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2704 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2705 /* FAILED RETRANSMISSION REQUEST */
2706 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2708 case TCM_WRITE_PROTECTED:
2711 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2713 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2714 /* WRITE PROTECTED */
2715 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2717 case TCM_ADDRESS_OUT_OF_RANGE:
2720 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2721 /* ILLEGAL REQUEST */
2722 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2723 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2724 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2726 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2729 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2730 /* UNIT ATTENTION */
2731 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2732 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2733 buffer[SPC_ASC_KEY_OFFSET] = asc;
2734 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2736 case TCM_CHECK_CONDITION_NOT_READY:
2739 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2741 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2742 transport_get_sense_codes(cmd, &asc, &ascq);
2743 buffer[SPC_ASC_KEY_OFFSET] = asc;
2744 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2746 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2750 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2751 /* ILLEGAL REQUEST */
2752 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2753 /* LOGICAL UNIT COMMUNICATION FAILURE */
2754 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2758 * This code uses linux/include/scsi/scsi.h SAM status codes!
2760 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2762 * Automatically padded, this value is encoded in the fabric's
2763 * data_length response PDU containing the SCSI defined sense data.
2765 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
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->se_tfo->queue_status(cmd);
2788 EXPORT_SYMBOL(transport_check_aborted_status);
2790 void transport_send_task_abort(struct se_cmd *cmd)
2792 unsigned long flags;
2794 spin_lock_irqsave(&cmd->t_state_lock, flags);
2795 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
2796 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2799 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2802 * If there are still expected incoming fabric WRITEs, we wait
2803 * until until they have completed before sending a TASK_ABORTED
2804 * response. This response with TASK_ABORTED status will be
2805 * queued back to fabric module by transport_check_aborted_status().
2807 if (cmd->data_direction == DMA_TO_DEVICE) {
2808 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2809 cmd->transport_state |= CMD_T_ABORTED;
2810 smp_mb__after_atomic_inc();
2813 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2815 transport_lun_remove_cmd(cmd);
2817 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2818 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
2819 cmd->se_tfo->get_task_tag(cmd));
2821 cmd->se_tfo->queue_status(cmd);
2824 static void target_tmr_work(struct work_struct *work)
2826 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2827 struct se_device *dev = cmd->se_dev;
2828 struct se_tmr_req *tmr = cmd->se_tmr_req;
2831 switch (tmr->function) {
2832 case TMR_ABORT_TASK:
2833 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2835 case TMR_ABORT_TASK_SET:
2837 case TMR_CLEAR_TASK_SET:
2838 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2841 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2842 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2843 TMR_FUNCTION_REJECTED;
2845 case TMR_TARGET_WARM_RESET:
2846 tmr->response = TMR_FUNCTION_REJECTED;
2848 case TMR_TARGET_COLD_RESET:
2849 tmr->response = TMR_FUNCTION_REJECTED;
2852 pr_err("Uknown TMR function: 0x%02x.\n",
2854 tmr->response = TMR_FUNCTION_REJECTED;
2858 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
2859 cmd->se_tfo->queue_tm_rsp(cmd);
2861 transport_cmd_check_stop_to_fabric(cmd);
2864 int transport_generic_handle_tmr(
2867 INIT_WORK(&cmd->work, target_tmr_work);
2868 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
2871 EXPORT_SYMBOL(transport_generic_handle_tmr);