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 transport_put_cmd(struct se_cmd *cmd);
69 static void target_complete_ok_work(struct work_struct *work);
71 int init_se_kmem_caches(void)
73 se_sess_cache = kmem_cache_create("se_sess_cache",
74 sizeof(struct se_session), __alignof__(struct se_session),
77 pr_err("kmem_cache_create() for struct se_session"
81 se_ua_cache = kmem_cache_create("se_ua_cache",
82 sizeof(struct se_ua), __alignof__(struct se_ua),
85 pr_err("kmem_cache_create() for struct se_ua failed\n");
86 goto out_free_sess_cache;
88 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
89 sizeof(struct t10_pr_registration),
90 __alignof__(struct t10_pr_registration), 0, NULL);
91 if (!t10_pr_reg_cache) {
92 pr_err("kmem_cache_create() for struct t10_pr_registration"
94 goto out_free_ua_cache;
96 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
97 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
99 if (!t10_alua_lu_gp_cache) {
100 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
102 goto out_free_pr_reg_cache;
104 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
105 sizeof(struct t10_alua_lu_gp_member),
106 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
107 if (!t10_alua_lu_gp_mem_cache) {
108 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
110 goto out_free_lu_gp_cache;
112 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
113 sizeof(struct t10_alua_tg_pt_gp),
114 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
115 if (!t10_alua_tg_pt_gp_cache) {
116 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
118 goto out_free_lu_gp_mem_cache;
120 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
121 "t10_alua_tg_pt_gp_mem_cache",
122 sizeof(struct t10_alua_tg_pt_gp_member),
123 __alignof__(struct t10_alua_tg_pt_gp_member),
125 if (!t10_alua_tg_pt_gp_mem_cache) {
126 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
128 goto out_free_tg_pt_gp_cache;
131 target_completion_wq = alloc_workqueue("target_completion",
133 if (!target_completion_wq)
134 goto out_free_tg_pt_gp_mem_cache;
138 out_free_tg_pt_gp_mem_cache:
139 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
140 out_free_tg_pt_gp_cache:
141 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
142 out_free_lu_gp_mem_cache:
143 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
144 out_free_lu_gp_cache:
145 kmem_cache_destroy(t10_alua_lu_gp_cache);
146 out_free_pr_reg_cache:
147 kmem_cache_destroy(t10_pr_reg_cache);
149 kmem_cache_destroy(se_ua_cache);
151 kmem_cache_destroy(se_sess_cache);
156 void release_se_kmem_caches(void)
158 destroy_workqueue(target_completion_wq);
159 kmem_cache_destroy(se_sess_cache);
160 kmem_cache_destroy(se_ua_cache);
161 kmem_cache_destroy(t10_pr_reg_cache);
162 kmem_cache_destroy(t10_alua_lu_gp_cache);
163 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
164 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
165 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
168 /* This code ensures unique mib indexes are handed out. */
169 static DEFINE_SPINLOCK(scsi_mib_index_lock);
170 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
173 * Allocate a new row index for the entry type specified
175 u32 scsi_get_new_index(scsi_index_t type)
179 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
181 spin_lock(&scsi_mib_index_lock);
182 new_index = ++scsi_mib_index[type];
183 spin_unlock(&scsi_mib_index_lock);
188 void transport_subsystem_check_init(void)
191 static int sub_api_initialized;
193 if (sub_api_initialized)
196 ret = request_module("target_core_iblock");
198 pr_err("Unable to load target_core_iblock\n");
200 ret = request_module("target_core_file");
202 pr_err("Unable to load target_core_file\n");
204 ret = request_module("target_core_pscsi");
206 pr_err("Unable to load target_core_pscsi\n");
208 sub_api_initialized = 1;
211 struct se_session *transport_init_session(void)
213 struct se_session *se_sess;
215 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
217 pr_err("Unable to allocate struct se_session from"
219 return ERR_PTR(-ENOMEM);
221 INIT_LIST_HEAD(&se_sess->sess_list);
222 INIT_LIST_HEAD(&se_sess->sess_acl_list);
223 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
224 INIT_LIST_HEAD(&se_sess->sess_wait_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_all(&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_all(&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 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
638 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
639 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
640 cmd->residual_count += cmd->data_length - length;
642 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
643 cmd->residual_count = cmd->data_length - length;
646 cmd->data_length = length;
649 target_complete_cmd(cmd, scsi_status);
651 EXPORT_SYMBOL(target_complete_cmd_with_length);
653 static void target_add_to_state_list(struct se_cmd *cmd)
655 struct se_device *dev = cmd->se_dev;
658 spin_lock_irqsave(&dev->execute_task_lock, flags);
659 if (!cmd->state_active) {
660 list_add_tail(&cmd->state_list, &dev->state_list);
661 cmd->state_active = true;
663 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
667 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
669 static void transport_write_pending_qf(struct se_cmd *cmd);
670 static void transport_complete_qf(struct se_cmd *cmd);
672 void target_qf_do_work(struct work_struct *work)
674 struct se_device *dev = container_of(work, struct se_device,
676 LIST_HEAD(qf_cmd_list);
677 struct se_cmd *cmd, *cmd_tmp;
679 spin_lock_irq(&dev->qf_cmd_lock);
680 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
681 spin_unlock_irq(&dev->qf_cmd_lock);
683 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
684 list_del(&cmd->se_qf_node);
685 atomic_dec(&dev->dev_qf_count);
686 smp_mb__after_atomic_dec();
688 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
689 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
690 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
691 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
694 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
695 transport_write_pending_qf(cmd);
696 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
697 transport_complete_qf(cmd);
701 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
703 switch (cmd->data_direction) {
706 case DMA_FROM_DEVICE:
710 case DMA_BIDIRECTIONAL:
719 void transport_dump_dev_state(
720 struct se_device *dev,
724 *bl += sprintf(b + *bl, "Status: ");
725 if (dev->export_count)
726 *bl += sprintf(b + *bl, "ACTIVATED");
728 *bl += sprintf(b + *bl, "DEACTIVATED");
730 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
731 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
732 dev->dev_attrib.block_size,
733 dev->dev_attrib.hw_max_sectors);
734 *bl += sprintf(b + *bl, " ");
737 void transport_dump_vpd_proto_id(
739 unsigned char *p_buf,
742 unsigned char buf[VPD_TMP_BUF_SIZE];
745 memset(buf, 0, VPD_TMP_BUF_SIZE);
746 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
748 switch (vpd->protocol_identifier) {
750 sprintf(buf+len, "Fibre Channel\n");
753 sprintf(buf+len, "Parallel SCSI\n");
756 sprintf(buf+len, "SSA\n");
759 sprintf(buf+len, "IEEE 1394\n");
762 sprintf(buf+len, "SCSI Remote Direct Memory Access"
766 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
769 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
772 sprintf(buf+len, "Automation/Drive Interface Transport"
776 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
779 sprintf(buf+len, "Unknown 0x%02x\n",
780 vpd->protocol_identifier);
785 strncpy(p_buf, buf, p_buf_len);
791 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
794 * Check if the Protocol Identifier Valid (PIV) bit is set..
796 * from spc3r23.pdf section 7.5.1
798 if (page_83[1] & 0x80) {
799 vpd->protocol_identifier = (page_83[0] & 0xf0);
800 vpd->protocol_identifier_set = 1;
801 transport_dump_vpd_proto_id(vpd, NULL, 0);
804 EXPORT_SYMBOL(transport_set_vpd_proto_id);
806 int transport_dump_vpd_assoc(
808 unsigned char *p_buf,
811 unsigned char buf[VPD_TMP_BUF_SIZE];
815 memset(buf, 0, VPD_TMP_BUF_SIZE);
816 len = sprintf(buf, "T10 VPD Identifier Association: ");
818 switch (vpd->association) {
820 sprintf(buf+len, "addressed logical unit\n");
823 sprintf(buf+len, "target port\n");
826 sprintf(buf+len, "SCSI target device\n");
829 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
835 strncpy(p_buf, buf, p_buf_len);
842 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
845 * The VPD identification association..
847 * from spc3r23.pdf Section 7.6.3.1 Table 297
849 vpd->association = (page_83[1] & 0x30);
850 return transport_dump_vpd_assoc(vpd, NULL, 0);
852 EXPORT_SYMBOL(transport_set_vpd_assoc);
854 int transport_dump_vpd_ident_type(
856 unsigned char *p_buf,
859 unsigned char buf[VPD_TMP_BUF_SIZE];
863 memset(buf, 0, VPD_TMP_BUF_SIZE);
864 len = sprintf(buf, "T10 VPD Identifier Type: ");
866 switch (vpd->device_identifier_type) {
868 sprintf(buf+len, "Vendor specific\n");
871 sprintf(buf+len, "T10 Vendor ID based\n");
874 sprintf(buf+len, "EUI-64 based\n");
877 sprintf(buf+len, "NAA\n");
880 sprintf(buf+len, "Relative target port identifier\n");
883 sprintf(buf+len, "SCSI name string\n");
886 sprintf(buf+len, "Unsupported: 0x%02x\n",
887 vpd->device_identifier_type);
893 if (p_buf_len < strlen(buf)+1)
895 strncpy(p_buf, buf, p_buf_len);
903 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
906 * The VPD identifier type..
908 * from spc3r23.pdf Section 7.6.3.1 Table 298
910 vpd->device_identifier_type = (page_83[1] & 0x0f);
911 return transport_dump_vpd_ident_type(vpd, NULL, 0);
913 EXPORT_SYMBOL(transport_set_vpd_ident_type);
915 int transport_dump_vpd_ident(
917 unsigned char *p_buf,
920 unsigned char buf[VPD_TMP_BUF_SIZE];
923 memset(buf, 0, VPD_TMP_BUF_SIZE);
925 switch (vpd->device_identifier_code_set) {
926 case 0x01: /* Binary */
927 snprintf(buf, sizeof(buf),
928 "T10 VPD Binary Device Identifier: %s\n",
929 &vpd->device_identifier[0]);
931 case 0x02: /* ASCII */
932 snprintf(buf, sizeof(buf),
933 "T10 VPD ASCII Device Identifier: %s\n",
934 &vpd->device_identifier[0]);
936 case 0x03: /* UTF-8 */
937 snprintf(buf, sizeof(buf),
938 "T10 VPD UTF-8 Device Identifier: %s\n",
939 &vpd->device_identifier[0]);
942 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
943 " 0x%02x", vpd->device_identifier_code_set);
949 strncpy(p_buf, buf, p_buf_len);
957 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
959 static const char hex_str[] = "0123456789abcdef";
960 int j = 0, i = 4; /* offset to start of the identifier */
963 * The VPD Code Set (encoding)
965 * from spc3r23.pdf Section 7.6.3.1 Table 296
967 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
968 switch (vpd->device_identifier_code_set) {
969 case 0x01: /* Binary */
970 vpd->device_identifier[j++] =
971 hex_str[vpd->device_identifier_type];
972 while (i < (4 + page_83[3])) {
973 vpd->device_identifier[j++] =
974 hex_str[(page_83[i] & 0xf0) >> 4];
975 vpd->device_identifier[j++] =
976 hex_str[page_83[i] & 0x0f];
980 case 0x02: /* ASCII */
981 case 0x03: /* UTF-8 */
982 while (i < (4 + page_83[3]))
983 vpd->device_identifier[j++] = page_83[i++];
989 return transport_dump_vpd_ident(vpd, NULL, 0);
991 EXPORT_SYMBOL(transport_set_vpd_ident);
994 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
996 struct se_device *dev = cmd->se_dev;
998 if (cmd->unknown_data_length) {
999 cmd->data_length = size;
1000 } else if (size != cmd->data_length) {
1001 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1002 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1003 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1004 cmd->data_length, size, cmd->t_task_cdb[0]);
1006 if (cmd->data_direction == DMA_TO_DEVICE) {
1007 pr_err("Rejecting underflow/overflow"
1009 return TCM_INVALID_CDB_FIELD;
1012 * Reject READ_* or WRITE_* with overflow/underflow for
1013 * type SCF_SCSI_DATA_CDB.
1015 if (dev->dev_attrib.block_size != 512) {
1016 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1017 " CDB on non 512-byte sector setup subsystem"
1018 " plugin: %s\n", dev->transport->name);
1019 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1020 return TCM_INVALID_CDB_FIELD;
1023 * For the overflow case keep the existing fabric provided
1024 * ->data_length. Otherwise for the underflow case, reset
1025 * ->data_length to the smaller SCSI expected data transfer
1028 if (size > cmd->data_length) {
1029 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1030 cmd->residual_count = (size - cmd->data_length);
1032 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1033 cmd->residual_count = (cmd->data_length - size);
1034 cmd->data_length = size;
1043 * Used by fabric modules containing a local struct se_cmd within their
1044 * fabric dependent per I/O descriptor.
1046 void transport_init_se_cmd(
1048 struct target_core_fabric_ops *tfo,
1049 struct se_session *se_sess,
1053 unsigned char *sense_buffer)
1055 INIT_LIST_HEAD(&cmd->se_lun_node);
1056 INIT_LIST_HEAD(&cmd->se_delayed_node);
1057 INIT_LIST_HEAD(&cmd->se_qf_node);
1058 INIT_LIST_HEAD(&cmd->se_cmd_list);
1059 INIT_LIST_HEAD(&cmd->state_list);
1060 init_completion(&cmd->transport_lun_fe_stop_comp);
1061 init_completion(&cmd->transport_lun_stop_comp);
1062 init_completion(&cmd->t_transport_stop_comp);
1063 init_completion(&cmd->cmd_wait_comp);
1064 init_completion(&cmd->task_stop_comp);
1065 spin_lock_init(&cmd->t_state_lock);
1066 cmd->transport_state = CMD_T_DEV_ACTIVE;
1069 cmd->se_sess = se_sess;
1070 cmd->data_length = data_length;
1071 cmd->data_direction = data_direction;
1072 cmd->sam_task_attr = task_attr;
1073 cmd->sense_buffer = sense_buffer;
1075 cmd->state_active = false;
1077 EXPORT_SYMBOL(transport_init_se_cmd);
1079 static sense_reason_t
1080 transport_check_alloc_task_attr(struct se_cmd *cmd)
1082 struct se_device *dev = cmd->se_dev;
1085 * Check if SAM Task Attribute emulation is enabled for this
1086 * struct se_device storage object
1088 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1091 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1092 pr_debug("SAM Task Attribute ACA"
1093 " emulation is not supported\n");
1094 return TCM_INVALID_CDB_FIELD;
1097 * Used to determine when ORDERED commands should go from
1098 * Dormant to Active status.
1100 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1101 smp_mb__after_atomic_inc();
1102 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1103 cmd->se_ordered_id, cmd->sam_task_attr,
1104 dev->transport->name);
1109 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1111 struct se_device *dev = cmd->se_dev;
1112 unsigned long flags;
1116 * Ensure that the received CDB is less than the max (252 + 8) bytes
1117 * for VARIABLE_LENGTH_CMD
1119 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1120 pr_err("Received SCSI CDB with command_size: %d that"
1121 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1122 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1123 return TCM_INVALID_CDB_FIELD;
1126 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1127 * allocate the additional extended CDB buffer now.. Otherwise
1128 * setup the pointer from __t_task_cdb to t_task_cdb.
1130 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1131 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1133 if (!cmd->t_task_cdb) {
1134 pr_err("Unable to allocate cmd->t_task_cdb"
1135 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1136 scsi_command_size(cdb),
1137 (unsigned long)sizeof(cmd->__t_task_cdb));
1138 return TCM_OUT_OF_RESOURCES;
1141 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1143 * Copy the original CDB into cmd->
1145 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1148 * Check for an existing UNIT ATTENTION condition
1150 ret = target_scsi3_ua_check(cmd);
1154 ret = target_alua_state_check(cmd);
1158 ret = target_check_reservation(cmd);
1160 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1164 ret = dev->transport->parse_cdb(cmd);
1168 ret = transport_check_alloc_task_attr(cmd);
1172 spin_lock_irqsave(&cmd->t_state_lock, flags);
1173 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1174 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1176 spin_lock(&cmd->se_lun->lun_sep_lock);
1177 if (cmd->se_lun->lun_sep)
1178 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1179 spin_unlock(&cmd->se_lun->lun_sep_lock);
1182 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1185 * Used by fabric module frontends to queue tasks directly.
1186 * Many only be used from process context only
1188 int transport_handle_cdb_direct(
1195 pr_err("cmd->se_lun is NULL\n");
1198 if (in_interrupt()) {
1200 pr_err("transport_generic_handle_cdb cannot be called"
1201 " from interrupt context\n");
1205 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1206 * outstanding descriptors are handled correctly during shutdown via
1207 * transport_wait_for_tasks()
1209 * Also, we don't take cmd->t_state_lock here as we only expect
1210 * this to be called for initial descriptor submission.
1212 cmd->t_state = TRANSPORT_NEW_CMD;
1213 cmd->transport_state |= CMD_T_ACTIVE;
1216 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1217 * so follow TRANSPORT_NEW_CMD processing thread context usage
1218 * and call transport_generic_request_failure() if necessary..
1220 ret = transport_generic_new_cmd(cmd);
1222 transport_generic_request_failure(cmd, ret);
1225 EXPORT_SYMBOL(transport_handle_cdb_direct);
1227 static sense_reason_t
1228 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1229 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1231 if (!sgl || !sgl_count)
1235 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1236 * scatterlists already have been set to follow what the fabric
1237 * passes for the original expected data transfer length.
1239 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1240 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1241 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1242 return TCM_INVALID_CDB_FIELD;
1245 cmd->t_data_sg = sgl;
1246 cmd->t_data_nents = sgl_count;
1248 if (sgl_bidi && sgl_bidi_count) {
1249 cmd->t_bidi_data_sg = sgl_bidi;
1250 cmd->t_bidi_data_nents = sgl_bidi_count;
1252 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1257 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1258 * se_cmd + use pre-allocated SGL memory.
1260 * @se_cmd: command descriptor to submit
1261 * @se_sess: associated se_sess for endpoint
1262 * @cdb: pointer to SCSI CDB
1263 * @sense: pointer to SCSI sense buffer
1264 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1265 * @data_length: fabric expected data transfer length
1266 * @task_addr: SAM task attribute
1267 * @data_dir: DMA data direction
1268 * @flags: flags for command submission from target_sc_flags_tables
1269 * @sgl: struct scatterlist memory for unidirectional mapping
1270 * @sgl_count: scatterlist count for unidirectional mapping
1271 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1272 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1274 * Returns non zero to signal active I/O shutdown failure. All other
1275 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1276 * but still return zero here.
1278 * This may only be called from process context, and also currently
1279 * assumes internal allocation of fabric payload buffer by target-core.
1281 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1282 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1283 u32 data_length, int task_attr, int data_dir, int flags,
1284 struct scatterlist *sgl, u32 sgl_count,
1285 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1287 struct se_portal_group *se_tpg;
1291 se_tpg = se_sess->se_tpg;
1293 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1294 BUG_ON(in_interrupt());
1296 * Initialize se_cmd for target operation. From this point
1297 * exceptions are handled by sending exception status via
1298 * target_core_fabric_ops->queue_status() callback
1300 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1301 data_length, data_dir, task_attr, sense);
1302 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1303 se_cmd->unknown_data_length = 1;
1305 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1306 * se_sess->sess_cmd_list. A second kref_get here is necessary
1307 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1308 * kref_put() to happen during fabric packet acknowledgement.
1310 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1314 * Signal bidirectional data payloads to target-core
1316 if (flags & TARGET_SCF_BIDI_OP)
1317 se_cmd->se_cmd_flags |= SCF_BIDI;
1319 * Locate se_lun pointer and attach it to struct se_cmd
1321 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1323 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1324 target_put_sess_cmd(se_sess, se_cmd);
1328 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1330 transport_generic_request_failure(se_cmd, rc);
1334 * When a non zero sgl_count has been passed perform SGL passthrough
1335 * mapping for pre-allocated fabric memory instead of having target
1336 * core perform an internal SGL allocation..
1338 if (sgl_count != 0) {
1342 * A work-around for tcm_loop as some userspace code via
1343 * scsi-generic do not memset their associated read buffers,
1344 * so go ahead and do that here for type non-data CDBs. Also
1345 * note that this is currently guaranteed to be a single SGL
1346 * for this case by target core in target_setup_cmd_from_cdb()
1347 * -> transport_generic_cmd_sequencer().
1349 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1350 se_cmd->data_direction == DMA_FROM_DEVICE) {
1351 unsigned char *buf = NULL;
1354 buf = kmap(sg_page(sgl)) + sgl->offset;
1357 memset(buf, 0, sgl->length);
1358 kunmap(sg_page(sgl));
1362 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1363 sgl_bidi, sgl_bidi_count);
1365 transport_generic_request_failure(se_cmd, rc);
1370 * Check if we need to delay processing because of ALUA
1371 * Active/NonOptimized primary access state..
1373 core_alua_check_nonop_delay(se_cmd);
1375 transport_handle_cdb_direct(se_cmd);
1378 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1381 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1383 * @se_cmd: command descriptor to submit
1384 * @se_sess: associated se_sess for endpoint
1385 * @cdb: pointer to SCSI CDB
1386 * @sense: pointer to SCSI sense buffer
1387 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1388 * @data_length: fabric expected data transfer length
1389 * @task_addr: SAM task attribute
1390 * @data_dir: DMA data direction
1391 * @flags: flags for command submission from target_sc_flags_tables
1393 * Returns non zero to signal active I/O shutdown failure. All other
1394 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1395 * but still return zero here.
1397 * This may only be called from process context, and also currently
1398 * assumes internal allocation of fabric payload buffer by target-core.
1400 * It also assumes interal target core SGL memory allocation.
1402 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1403 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1404 u32 data_length, int task_attr, int data_dir, int flags)
1406 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1407 unpacked_lun, data_length, task_attr, data_dir,
1408 flags, NULL, 0, NULL, 0);
1410 EXPORT_SYMBOL(target_submit_cmd);
1412 static void target_complete_tmr_failure(struct work_struct *work)
1414 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1416 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1417 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1419 transport_cmd_check_stop_to_fabric(se_cmd);
1423 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1426 * @se_cmd: command descriptor to submit
1427 * @se_sess: associated se_sess for endpoint
1428 * @sense: pointer to SCSI sense buffer
1429 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1430 * @fabric_context: fabric context for TMR req
1431 * @tm_type: Type of TM request
1432 * @gfp: gfp type for caller
1433 * @tag: referenced task tag for TMR_ABORT_TASK
1434 * @flags: submit cmd flags
1436 * Callable from all contexts.
1439 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1440 unsigned char *sense, u32 unpacked_lun,
1441 void *fabric_tmr_ptr, unsigned char tm_type,
1442 gfp_t gfp, unsigned int tag, int flags)
1444 struct se_portal_group *se_tpg;
1447 se_tpg = se_sess->se_tpg;
1450 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1451 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1453 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1454 * allocation failure.
1456 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1460 if (tm_type == TMR_ABORT_TASK)
1461 se_cmd->se_tmr_req->ref_task_tag = tag;
1463 /* See target_submit_cmd for commentary */
1464 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1466 core_tmr_release_req(se_cmd->se_tmr_req);
1470 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1473 * For callback during failure handling, push this work off
1474 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1476 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1477 schedule_work(&se_cmd->work);
1480 transport_generic_handle_tmr(se_cmd);
1483 EXPORT_SYMBOL(target_submit_tmr);
1486 * If the cmd is active, request it to be stopped and sleep until it
1489 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1491 bool was_active = false;
1493 if (cmd->transport_state & CMD_T_BUSY) {
1494 cmd->transport_state |= CMD_T_REQUEST_STOP;
1495 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1497 pr_debug("cmd %p waiting to complete\n", cmd);
1498 wait_for_completion(&cmd->task_stop_comp);
1499 pr_debug("cmd %p stopped successfully\n", cmd);
1501 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1502 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1503 cmd->transport_state &= ~CMD_T_BUSY;
1511 * Handle SAM-esque emulation for generic transport request failures.
1513 void transport_generic_request_failure(struct se_cmd *cmd,
1514 sense_reason_t sense_reason)
1518 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1519 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1520 cmd->t_task_cdb[0]);
1521 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1522 cmd->se_tfo->get_cmd_state(cmd),
1523 cmd->t_state, sense_reason);
1524 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1525 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1526 (cmd->transport_state & CMD_T_STOP) != 0,
1527 (cmd->transport_state & CMD_T_SENT) != 0);
1530 * For SAM Task Attribute emulation for failed struct se_cmd
1532 transport_complete_task_attr(cmd);
1534 switch (sense_reason) {
1535 case TCM_NON_EXISTENT_LUN:
1536 case TCM_UNSUPPORTED_SCSI_OPCODE:
1537 case TCM_INVALID_CDB_FIELD:
1538 case TCM_INVALID_PARAMETER_LIST:
1539 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1540 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1541 case TCM_UNKNOWN_MODE_PAGE:
1542 case TCM_WRITE_PROTECTED:
1543 case TCM_ADDRESS_OUT_OF_RANGE:
1544 case TCM_CHECK_CONDITION_ABORT_CMD:
1545 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1546 case TCM_CHECK_CONDITION_NOT_READY:
1548 case TCM_OUT_OF_RESOURCES:
1549 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1551 case TCM_RESERVATION_CONFLICT:
1553 * No SENSE Data payload for this case, set SCSI Status
1554 * and queue the response to $FABRIC_MOD.
1556 * Uses linux/include/scsi/scsi.h SAM status codes defs
1558 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1560 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1561 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1564 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1567 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1568 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1569 cmd->orig_fe_lun, 0x2C,
1570 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1572 ret = cmd->se_tfo->queue_status(cmd);
1573 if (ret == -EAGAIN || ret == -ENOMEM)
1577 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1578 cmd->t_task_cdb[0], sense_reason);
1579 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1583 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1584 if (ret == -EAGAIN || ret == -ENOMEM)
1588 transport_lun_remove_cmd(cmd);
1589 if (!transport_cmd_check_stop_to_fabric(cmd))
1594 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1595 transport_handle_queue_full(cmd, cmd->se_dev);
1597 EXPORT_SYMBOL(transport_generic_request_failure);
1599 static void __target_execute_cmd(struct se_cmd *cmd)
1603 spin_lock_irq(&cmd->t_state_lock);
1604 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1605 spin_unlock_irq(&cmd->t_state_lock);
1607 if (cmd->execute_cmd) {
1608 ret = cmd->execute_cmd(cmd);
1610 spin_lock_irq(&cmd->t_state_lock);
1611 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1612 spin_unlock_irq(&cmd->t_state_lock);
1614 transport_generic_request_failure(cmd, ret);
1619 static bool target_handle_task_attr(struct se_cmd *cmd)
1621 struct se_device *dev = cmd->se_dev;
1623 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1627 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1628 * to allow the passed struct se_cmd list of tasks to the front of the list.
1630 switch (cmd->sam_task_attr) {
1632 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1633 "se_ordered_id: %u\n",
1634 cmd->t_task_cdb[0], cmd->se_ordered_id);
1636 case MSG_ORDERED_TAG:
1637 atomic_inc(&dev->dev_ordered_sync);
1638 smp_mb__after_atomic_inc();
1640 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1641 " se_ordered_id: %u\n",
1642 cmd->t_task_cdb[0], cmd->se_ordered_id);
1645 * Execute an ORDERED command if no other older commands
1646 * exist that need to be completed first.
1648 if (!atomic_read(&dev->simple_cmds))
1653 * For SIMPLE and UNTAGGED Task Attribute commands
1655 atomic_inc(&dev->simple_cmds);
1656 smp_mb__after_atomic_inc();
1660 if (atomic_read(&dev->dev_ordered_sync) == 0)
1663 spin_lock(&dev->delayed_cmd_lock);
1664 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1665 spin_unlock(&dev->delayed_cmd_lock);
1667 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1668 " delayed CMD list, se_ordered_id: %u\n",
1669 cmd->t_task_cdb[0], cmd->sam_task_attr,
1670 cmd->se_ordered_id);
1674 void target_execute_cmd(struct se_cmd *cmd)
1677 * If the received CDB has aleady been aborted stop processing it here.
1679 if (transport_check_aborted_status(cmd, 1)) {
1680 complete(&cmd->transport_lun_stop_comp);
1685 * Determine if IOCTL context caller in requesting the stopping of this
1686 * command for LUN shutdown purposes.
1688 spin_lock_irq(&cmd->t_state_lock);
1689 if (cmd->transport_state & CMD_T_LUN_STOP) {
1690 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1691 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1693 cmd->transport_state &= ~CMD_T_ACTIVE;
1694 spin_unlock_irq(&cmd->t_state_lock);
1695 complete(&cmd->transport_lun_stop_comp);
1699 * Determine if frontend context caller is requesting the stopping of
1700 * this command for frontend exceptions.
1702 if (cmd->transport_state & CMD_T_STOP) {
1703 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1705 cmd->se_tfo->get_task_tag(cmd));
1707 spin_unlock_irq(&cmd->t_state_lock);
1708 complete_all(&cmd->t_transport_stop_comp);
1712 cmd->t_state = TRANSPORT_PROCESSING;
1713 cmd->transport_state |= CMD_T_ACTIVE;
1714 spin_unlock_irq(&cmd->t_state_lock);
1716 if (!target_handle_task_attr(cmd))
1717 __target_execute_cmd(cmd);
1719 EXPORT_SYMBOL(target_execute_cmd);
1722 * Process all commands up to the last received ORDERED task attribute which
1723 * requires another blocking boundary
1725 static void target_restart_delayed_cmds(struct se_device *dev)
1730 spin_lock(&dev->delayed_cmd_lock);
1731 if (list_empty(&dev->delayed_cmd_list)) {
1732 spin_unlock(&dev->delayed_cmd_lock);
1736 cmd = list_entry(dev->delayed_cmd_list.next,
1737 struct se_cmd, se_delayed_node);
1738 list_del(&cmd->se_delayed_node);
1739 spin_unlock(&dev->delayed_cmd_lock);
1741 __target_execute_cmd(cmd);
1743 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1749 * Called from I/O completion to determine which dormant/delayed
1750 * and ordered cmds need to have their tasks added to the execution queue.
1752 static void transport_complete_task_attr(struct se_cmd *cmd)
1754 struct se_device *dev = cmd->se_dev;
1756 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1759 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1760 atomic_dec(&dev->simple_cmds);
1761 smp_mb__after_atomic_dec();
1762 dev->dev_cur_ordered_id++;
1763 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1764 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1765 cmd->se_ordered_id);
1766 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1767 dev->dev_cur_ordered_id++;
1768 pr_debug("Incremented dev_cur_ordered_id: %u for"
1769 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1770 cmd->se_ordered_id);
1771 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1772 atomic_dec(&dev->dev_ordered_sync);
1773 smp_mb__after_atomic_dec();
1775 dev->dev_cur_ordered_id++;
1776 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1777 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1780 target_restart_delayed_cmds(dev);
1783 static void transport_complete_qf(struct se_cmd *cmd)
1787 transport_complete_task_attr(cmd);
1789 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1790 ret = cmd->se_tfo->queue_status(cmd);
1794 switch (cmd->data_direction) {
1795 case DMA_FROM_DEVICE:
1796 ret = cmd->se_tfo->queue_data_in(cmd);
1799 if (cmd->t_bidi_data_sg) {
1800 ret = cmd->se_tfo->queue_data_in(cmd);
1804 /* Fall through for DMA_TO_DEVICE */
1806 ret = cmd->se_tfo->queue_status(cmd);
1814 transport_handle_queue_full(cmd, cmd->se_dev);
1817 transport_lun_remove_cmd(cmd);
1818 transport_cmd_check_stop_to_fabric(cmd);
1821 static void transport_handle_queue_full(
1823 struct se_device *dev)
1825 spin_lock_irq(&dev->qf_cmd_lock);
1826 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1827 atomic_inc(&dev->dev_qf_count);
1828 smp_mb__after_atomic_inc();
1829 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1831 schedule_work(&cmd->se_dev->qf_work_queue);
1834 static void target_complete_ok_work(struct work_struct *work)
1836 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1840 * Check if we need to move delayed/dormant tasks from cmds on the
1841 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1844 transport_complete_task_attr(cmd);
1847 * Check to schedule QUEUE_FULL work, or execute an existing
1848 * cmd->transport_qf_callback()
1850 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1851 schedule_work(&cmd->se_dev->qf_work_queue);
1854 * Check if we need to send a sense buffer from
1855 * the struct se_cmd in question.
1857 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1858 WARN_ON(!cmd->scsi_status);
1859 ret = transport_send_check_condition_and_sense(
1861 if (ret == -EAGAIN || ret == -ENOMEM)
1864 transport_lun_remove_cmd(cmd);
1865 transport_cmd_check_stop_to_fabric(cmd);
1869 * Check for a callback, used by amongst other things
1870 * XDWRITE_READ_10 emulation.
1872 if (cmd->transport_complete_callback)
1873 cmd->transport_complete_callback(cmd);
1875 switch (cmd->data_direction) {
1876 case DMA_FROM_DEVICE:
1877 spin_lock(&cmd->se_lun->lun_sep_lock);
1878 if (cmd->se_lun->lun_sep) {
1879 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1882 spin_unlock(&cmd->se_lun->lun_sep_lock);
1884 ret = cmd->se_tfo->queue_data_in(cmd);
1885 if (ret == -EAGAIN || ret == -ENOMEM)
1889 spin_lock(&cmd->se_lun->lun_sep_lock);
1890 if (cmd->se_lun->lun_sep) {
1891 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
1894 spin_unlock(&cmd->se_lun->lun_sep_lock);
1896 * Check if we need to send READ payload for BIDI-COMMAND
1898 if (cmd->t_bidi_data_sg) {
1899 spin_lock(&cmd->se_lun->lun_sep_lock);
1900 if (cmd->se_lun->lun_sep) {
1901 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1904 spin_unlock(&cmd->se_lun->lun_sep_lock);
1905 ret = cmd->se_tfo->queue_data_in(cmd);
1906 if (ret == -EAGAIN || ret == -ENOMEM)
1910 /* Fall through for DMA_TO_DEVICE */
1912 ret = cmd->se_tfo->queue_status(cmd);
1913 if (ret == -EAGAIN || ret == -ENOMEM)
1920 transport_lun_remove_cmd(cmd);
1921 transport_cmd_check_stop_to_fabric(cmd);
1925 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
1926 " data_direction: %d\n", cmd, cmd->data_direction);
1927 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1928 transport_handle_queue_full(cmd, cmd->se_dev);
1931 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
1933 struct scatterlist *sg;
1936 for_each_sg(sgl, sg, nents, count)
1937 __free_page(sg_page(sg));
1942 static inline void transport_free_pages(struct se_cmd *cmd)
1944 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
1947 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
1948 cmd->t_data_sg = NULL;
1949 cmd->t_data_nents = 0;
1951 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
1952 cmd->t_bidi_data_sg = NULL;
1953 cmd->t_bidi_data_nents = 0;
1957 * transport_release_cmd - free a command
1958 * @cmd: command to free
1960 * This routine unconditionally frees a command, and reference counting
1961 * or list removal must be done in the caller.
1963 static int transport_release_cmd(struct se_cmd *cmd)
1965 BUG_ON(!cmd->se_tfo);
1967 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
1968 core_tmr_release_req(cmd->se_tmr_req);
1969 if (cmd->t_task_cdb != cmd->__t_task_cdb)
1970 kfree(cmd->t_task_cdb);
1972 * If this cmd has been setup with target_get_sess_cmd(), drop
1973 * the kref and call ->release_cmd() in kref callback.
1975 if (cmd->check_release != 0)
1976 return target_put_sess_cmd(cmd->se_sess, cmd);
1978 cmd->se_tfo->release_cmd(cmd);
1983 * transport_put_cmd - release a reference to a command
1984 * @cmd: command to release
1986 * This routine releases our reference to the command and frees it if possible.
1988 static int transport_put_cmd(struct se_cmd *cmd)
1990 unsigned long flags;
1992 spin_lock_irqsave(&cmd->t_state_lock, flags);
1993 if (atomic_read(&cmd->t_fe_count) &&
1994 !atomic_dec_and_test(&cmd->t_fe_count)) {
1995 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1999 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2000 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2001 target_remove_from_state_list(cmd);
2003 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2005 transport_free_pages(cmd);
2006 return transport_release_cmd(cmd);
2009 void *transport_kmap_data_sg(struct se_cmd *cmd)
2011 struct scatterlist *sg = cmd->t_data_sg;
2012 struct page **pages;
2016 * We need to take into account a possible offset here for fabrics like
2017 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2018 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2020 if (!cmd->t_data_nents)
2024 if (cmd->t_data_nents == 1)
2025 return kmap(sg_page(sg)) + sg->offset;
2027 /* >1 page. use vmap */
2028 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2032 /* convert sg[] to pages[] */
2033 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2034 pages[i] = sg_page(sg);
2037 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2039 if (!cmd->t_data_vmap)
2042 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2044 EXPORT_SYMBOL(transport_kmap_data_sg);
2046 void transport_kunmap_data_sg(struct se_cmd *cmd)
2048 if (!cmd->t_data_nents) {
2050 } else if (cmd->t_data_nents == 1) {
2051 kunmap(sg_page(cmd->t_data_sg));
2055 vunmap(cmd->t_data_vmap);
2056 cmd->t_data_vmap = NULL;
2058 EXPORT_SYMBOL(transport_kunmap_data_sg);
2061 transport_generic_get_mem(struct se_cmd *cmd)
2063 u32 length = cmd->data_length;
2069 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2070 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2071 if (!cmd->t_data_sg)
2074 cmd->t_data_nents = nents;
2075 sg_init_table(cmd->t_data_sg, nents);
2077 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2080 u32 page_len = min_t(u32, length, PAGE_SIZE);
2081 page = alloc_page(GFP_KERNEL | zero_flag);
2085 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2094 __free_page(sg_page(&cmd->t_data_sg[i]));
2096 kfree(cmd->t_data_sg);
2097 cmd->t_data_sg = NULL;
2102 * Allocate any required resources to execute the command. For writes we
2103 * might not have the payload yet, so notify the fabric via a call to
2104 * ->write_pending instead. Otherwise place it on the execution queue.
2107 transport_generic_new_cmd(struct se_cmd *cmd)
2112 * Determine is the TCM fabric module has already allocated physical
2113 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2116 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2118 ret = transport_generic_get_mem(cmd);
2120 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2123 atomic_inc(&cmd->t_fe_count);
2126 * If this command is not a write we can execute it right here,
2127 * for write buffers we need to notify the fabric driver first
2128 * and let it call back once the write buffers are ready.
2130 target_add_to_state_list(cmd);
2131 if (cmd->data_direction != DMA_TO_DEVICE) {
2132 target_execute_cmd(cmd);
2136 spin_lock_irq(&cmd->t_state_lock);
2137 cmd->t_state = TRANSPORT_WRITE_PENDING;
2138 spin_unlock_irq(&cmd->t_state_lock);
2140 transport_cmd_check_stop(cmd, false);
2142 ret = cmd->se_tfo->write_pending(cmd);
2143 if (ret == -EAGAIN || ret == -ENOMEM)
2146 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2149 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2152 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2153 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2154 transport_handle_queue_full(cmd, cmd->se_dev);
2157 EXPORT_SYMBOL(transport_generic_new_cmd);
2159 static void transport_write_pending_qf(struct se_cmd *cmd)
2163 ret = cmd->se_tfo->write_pending(cmd);
2164 if (ret == -EAGAIN || ret == -ENOMEM) {
2165 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2167 transport_handle_queue_full(cmd, cmd->se_dev);
2171 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2175 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2176 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2177 transport_wait_for_tasks(cmd);
2179 ret = transport_release_cmd(cmd);
2182 transport_wait_for_tasks(cmd);
2185 transport_lun_remove_cmd(cmd);
2187 ret = transport_put_cmd(cmd);
2191 EXPORT_SYMBOL(transport_generic_free_cmd);
2193 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2194 * @se_sess: session to reference
2195 * @se_cmd: command descriptor to add
2196 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2198 int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2201 unsigned long flags;
2204 kref_init(&se_cmd->cmd_kref);
2206 * Add a second kref if the fabric caller is expecting to handle
2207 * fabric acknowledgement that requires two target_put_sess_cmd()
2208 * invocations before se_cmd descriptor release.
2210 if (ack_kref == true) {
2211 kref_get(&se_cmd->cmd_kref);
2212 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2215 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2216 if (se_sess->sess_tearing_down) {
2220 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2221 se_cmd->check_release = 1;
2224 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2227 EXPORT_SYMBOL(target_get_sess_cmd);
2229 static void target_release_cmd_kref(struct kref *kref)
2231 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2232 struct se_session *se_sess = se_cmd->se_sess;
2234 if (list_empty(&se_cmd->se_cmd_list)) {
2235 spin_unlock(&se_sess->sess_cmd_lock);
2236 se_cmd->se_tfo->release_cmd(se_cmd);
2239 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2240 spin_unlock(&se_sess->sess_cmd_lock);
2241 complete(&se_cmd->cmd_wait_comp);
2244 list_del(&se_cmd->se_cmd_list);
2245 spin_unlock(&se_sess->sess_cmd_lock);
2247 se_cmd->se_tfo->release_cmd(se_cmd);
2250 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2251 * @se_sess: session to reference
2252 * @se_cmd: command descriptor to drop
2254 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2256 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2257 &se_sess->sess_cmd_lock);
2259 EXPORT_SYMBOL(target_put_sess_cmd);
2261 /* target_sess_cmd_list_set_waiting - Flag all commands in
2262 * sess_cmd_list to complete cmd_wait_comp. Set
2263 * sess_tearing_down so no more commands are queued.
2264 * @se_sess: session to flag
2266 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2268 struct se_cmd *se_cmd;
2269 unsigned long flags;
2271 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2272 if (se_sess->sess_tearing_down) {
2273 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2276 se_sess->sess_tearing_down = 1;
2277 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2279 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2280 se_cmd->cmd_wait_set = 1;
2282 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2284 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2286 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2287 * @se_sess: session to wait for active I/O
2289 void target_wait_for_sess_cmds(struct se_session *se_sess)
2291 struct se_cmd *se_cmd, *tmp_cmd;
2292 unsigned long flags;
2294 list_for_each_entry_safe(se_cmd, tmp_cmd,
2295 &se_sess->sess_wait_list, se_cmd_list) {
2296 list_del(&se_cmd->se_cmd_list);
2298 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2299 " %d\n", se_cmd, se_cmd->t_state,
2300 se_cmd->se_tfo->get_cmd_state(se_cmd));
2302 wait_for_completion(&se_cmd->cmd_wait_comp);
2303 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2304 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2305 se_cmd->se_tfo->get_cmd_state(se_cmd));
2307 se_cmd->se_tfo->release_cmd(se_cmd);
2310 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2311 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2312 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2315 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2317 /* transport_lun_wait_for_tasks():
2319 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2320 * an struct se_lun to be successfully shutdown.
2322 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2324 unsigned long flags;
2328 * If the frontend has already requested this struct se_cmd to
2329 * be stopped, we can safely ignore this struct se_cmd.
2331 spin_lock_irqsave(&cmd->t_state_lock, flags);
2332 if (cmd->transport_state & CMD_T_STOP) {
2333 cmd->transport_state &= ~CMD_T_LUN_STOP;
2335 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2336 cmd->se_tfo->get_task_tag(cmd));
2337 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2338 transport_cmd_check_stop(cmd, false);
2341 cmd->transport_state |= CMD_T_LUN_FE_STOP;
2342 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2344 // XXX: audit task_flags checks.
2345 spin_lock_irqsave(&cmd->t_state_lock, flags);
2346 if ((cmd->transport_state & CMD_T_BUSY) &&
2347 (cmd->transport_state & CMD_T_SENT)) {
2348 if (!target_stop_cmd(cmd, &flags))
2351 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2353 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2356 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2357 cmd->se_tfo->get_task_tag(cmd));
2358 wait_for_completion(&cmd->transport_lun_stop_comp);
2359 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2360 cmd->se_tfo->get_task_tag(cmd));
2366 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2368 struct se_cmd *cmd = NULL;
2369 unsigned long lun_flags, cmd_flags;
2371 * Do exception processing and return CHECK_CONDITION status to the
2374 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2375 while (!list_empty(&lun->lun_cmd_list)) {
2376 cmd = list_first_entry(&lun->lun_cmd_list,
2377 struct se_cmd, se_lun_node);
2378 list_del_init(&cmd->se_lun_node);
2380 spin_lock(&cmd->t_state_lock);
2381 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2382 "_lun_stop for ITT: 0x%08x\n",
2383 cmd->se_lun->unpacked_lun,
2384 cmd->se_tfo->get_task_tag(cmd));
2385 cmd->transport_state |= CMD_T_LUN_STOP;
2386 spin_unlock(&cmd->t_state_lock);
2388 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2391 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2392 cmd->se_tfo->get_task_tag(cmd),
2393 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2397 * If the Storage engine still owns the iscsi_cmd_t, determine
2398 * and/or stop its context.
2400 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2401 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2402 cmd->se_tfo->get_task_tag(cmd));
2404 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2405 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2409 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2410 "_wait_for_tasks(): SUCCESS\n",
2411 cmd->se_lun->unpacked_lun,
2412 cmd->se_tfo->get_task_tag(cmd));
2414 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2415 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2416 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2419 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2420 target_remove_from_state_list(cmd);
2421 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2424 * The Storage engine stopped this struct se_cmd before it was
2425 * send to the fabric frontend for delivery back to the
2426 * Initiator Node. Return this SCSI CDB back with an
2427 * CHECK_CONDITION status.
2430 transport_send_check_condition_and_sense(cmd,
2431 TCM_NON_EXISTENT_LUN, 0);
2433 * If the fabric frontend is waiting for this iscsi_cmd_t to
2434 * be released, notify the waiting thread now that LU has
2435 * finished accessing it.
2437 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2438 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2439 pr_debug("SE_LUN[%d] - Detected FE stop for"
2440 " struct se_cmd: %p ITT: 0x%08x\n",
2442 cmd, cmd->se_tfo->get_task_tag(cmd));
2444 spin_unlock_irqrestore(&cmd->t_state_lock,
2446 transport_cmd_check_stop(cmd, false);
2447 complete(&cmd->transport_lun_fe_stop_comp);
2448 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2451 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2452 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2454 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2455 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2457 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2460 static int transport_clear_lun_thread(void *p)
2462 struct se_lun *lun = p;
2464 __transport_clear_lun_from_sessions(lun);
2465 complete(&lun->lun_shutdown_comp);
2470 int transport_clear_lun_from_sessions(struct se_lun *lun)
2472 struct task_struct *kt;
2474 kt = kthread_run(transport_clear_lun_thread, lun,
2475 "tcm_cl_%u", lun->unpacked_lun);
2477 pr_err("Unable to start clear_lun thread\n");
2480 wait_for_completion(&lun->lun_shutdown_comp);
2486 * transport_wait_for_tasks - wait for completion to occur
2487 * @cmd: command to wait
2489 * Called from frontend fabric context to wait for storage engine
2490 * to pause and/or release frontend generated struct se_cmd.
2492 bool transport_wait_for_tasks(struct se_cmd *cmd)
2494 unsigned long flags;
2496 spin_lock_irqsave(&cmd->t_state_lock, flags);
2497 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2498 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2499 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2503 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2504 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2505 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2509 * If we are already stopped due to an external event (ie: LUN shutdown)
2510 * sleep until the connection can have the passed struct se_cmd back.
2511 * The cmd->transport_lun_stopped_sem will be upped by
2512 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2513 * has completed its operation on the struct se_cmd.
2515 if (cmd->transport_state & CMD_T_LUN_STOP) {
2516 pr_debug("wait_for_tasks: Stopping"
2517 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2518 "_stop_comp); for ITT: 0x%08x\n",
2519 cmd->se_tfo->get_task_tag(cmd));
2521 * There is a special case for WRITES where a FE exception +
2522 * LUN shutdown means ConfigFS context is still sleeping on
2523 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2524 * We go ahead and up transport_lun_stop_comp just to be sure
2527 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2528 complete(&cmd->transport_lun_stop_comp);
2529 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2530 spin_lock_irqsave(&cmd->t_state_lock, flags);
2532 target_remove_from_state_list(cmd);
2534 * At this point, the frontend who was the originator of this
2535 * struct se_cmd, now owns the structure and can be released through
2536 * normal means below.
2538 pr_debug("wait_for_tasks: Stopped"
2539 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2540 "stop_comp); for ITT: 0x%08x\n",
2541 cmd->se_tfo->get_task_tag(cmd));
2543 cmd->transport_state &= ~CMD_T_LUN_STOP;
2546 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2547 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2551 cmd->transport_state |= CMD_T_STOP;
2553 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2554 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2555 cmd, cmd->se_tfo->get_task_tag(cmd),
2556 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2558 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2560 wait_for_completion(&cmd->t_transport_stop_comp);
2562 spin_lock_irqsave(&cmd->t_state_lock, flags);
2563 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2565 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2566 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2567 cmd->se_tfo->get_task_tag(cmd));
2569 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2573 EXPORT_SYMBOL(transport_wait_for_tasks);
2575 static int transport_get_sense_codes(
2580 *asc = cmd->scsi_asc;
2581 *ascq = cmd->scsi_ascq;
2587 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2588 sense_reason_t reason, int from_transport)
2590 unsigned char *buffer = cmd->sense_buffer;
2591 unsigned long flags;
2592 u8 asc = 0, ascq = 0;
2594 spin_lock_irqsave(&cmd->t_state_lock, flags);
2595 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2596 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2599 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2600 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2602 if (!reason && from_transport)
2605 if (!from_transport)
2606 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2609 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2610 * SENSE KEY values from include/scsi/scsi.h
2616 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2618 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2619 /* NO ADDITIONAL SENSE INFORMATION */
2620 buffer[SPC_ASC_KEY_OFFSET] = 0;
2621 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2623 case TCM_NON_EXISTENT_LUN:
2626 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2627 /* ILLEGAL REQUEST */
2628 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2629 /* LOGICAL UNIT NOT SUPPORTED */
2630 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2632 case TCM_UNSUPPORTED_SCSI_OPCODE:
2633 case TCM_SECTOR_COUNT_TOO_MANY:
2636 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2637 /* ILLEGAL REQUEST */
2638 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2639 /* INVALID COMMAND OPERATION CODE */
2640 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2642 case TCM_UNKNOWN_MODE_PAGE:
2645 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2646 /* ILLEGAL REQUEST */
2647 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2648 /* INVALID FIELD IN CDB */
2649 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2651 case TCM_CHECK_CONDITION_ABORT_CMD:
2654 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2655 /* ABORTED COMMAND */
2656 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2657 /* BUS DEVICE RESET FUNCTION OCCURRED */
2658 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2659 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2661 case TCM_INCORRECT_AMOUNT_OF_DATA:
2664 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2665 /* ABORTED COMMAND */
2666 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2668 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2669 /* NOT ENOUGH UNSOLICITED DATA */
2670 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2672 case TCM_INVALID_CDB_FIELD:
2675 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2676 /* ILLEGAL REQUEST */
2677 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2678 /* INVALID FIELD IN CDB */
2679 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2681 case TCM_INVALID_PARAMETER_LIST:
2684 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2685 /* ILLEGAL REQUEST */
2686 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2687 /* INVALID FIELD IN PARAMETER LIST */
2688 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2690 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2693 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2694 /* ILLEGAL REQUEST */
2695 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2696 /* PARAMETER LIST LENGTH ERROR */
2697 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2699 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2702 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2703 /* ABORTED COMMAND */
2704 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2706 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2707 /* UNEXPECTED_UNSOLICITED_DATA */
2708 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2710 case TCM_SERVICE_CRC_ERROR:
2713 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2714 /* ABORTED COMMAND */
2715 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2716 /* PROTOCOL SERVICE CRC ERROR */
2717 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2719 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2721 case TCM_SNACK_REJECTED:
2724 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2725 /* ABORTED COMMAND */
2726 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2728 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2729 /* FAILED RETRANSMISSION REQUEST */
2730 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2732 case TCM_WRITE_PROTECTED:
2735 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2737 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2738 /* WRITE PROTECTED */
2739 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2741 case TCM_ADDRESS_OUT_OF_RANGE:
2744 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2745 /* ILLEGAL REQUEST */
2746 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2747 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2748 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2750 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2753 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2754 /* UNIT ATTENTION */
2755 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2756 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2757 buffer[SPC_ASC_KEY_OFFSET] = asc;
2758 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2760 case TCM_CHECK_CONDITION_NOT_READY:
2763 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2765 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2766 transport_get_sense_codes(cmd, &asc, &ascq);
2767 buffer[SPC_ASC_KEY_OFFSET] = asc;
2768 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2770 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2774 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2776 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2777 * Solaris initiators. Returning NOT READY instead means the
2778 * operations will be retried a finite number of times and we
2779 * can survive intermittent errors.
2781 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2782 /* LOGICAL UNIT COMMUNICATION FAILURE */
2783 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2787 * This code uses linux/include/scsi/scsi.h SAM status codes!
2789 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2791 * Automatically padded, this value is encoded in the fabric's
2792 * data_length response PDU containing the SCSI defined sense data.
2794 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2797 return cmd->se_tfo->queue_status(cmd);
2799 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2801 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2803 if (!(cmd->transport_state & CMD_T_ABORTED))
2806 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2809 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2810 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
2812 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2813 cmd->se_tfo->queue_status(cmd);
2817 EXPORT_SYMBOL(transport_check_aborted_status);
2819 void transport_send_task_abort(struct se_cmd *cmd)
2821 unsigned long flags;
2823 spin_lock_irqsave(&cmd->t_state_lock, flags);
2824 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
2825 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2828 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2831 * If there are still expected incoming fabric WRITEs, we wait
2832 * until until they have completed before sending a TASK_ABORTED
2833 * response. This response with TASK_ABORTED status will be
2834 * queued back to fabric module by transport_check_aborted_status().
2836 if (cmd->data_direction == DMA_TO_DEVICE) {
2837 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2838 cmd->transport_state |= CMD_T_ABORTED;
2839 smp_mb__after_atomic_inc();
2842 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2844 transport_lun_remove_cmd(cmd);
2846 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2847 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
2848 cmd->se_tfo->get_task_tag(cmd));
2850 cmd->se_tfo->queue_status(cmd);
2853 static void target_tmr_work(struct work_struct *work)
2855 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2856 struct se_device *dev = cmd->se_dev;
2857 struct se_tmr_req *tmr = cmd->se_tmr_req;
2860 switch (tmr->function) {
2861 case TMR_ABORT_TASK:
2862 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2864 case TMR_ABORT_TASK_SET:
2866 case TMR_CLEAR_TASK_SET:
2867 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2870 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2871 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2872 TMR_FUNCTION_REJECTED;
2874 case TMR_TARGET_WARM_RESET:
2875 tmr->response = TMR_FUNCTION_REJECTED;
2877 case TMR_TARGET_COLD_RESET:
2878 tmr->response = TMR_FUNCTION_REJECTED;
2881 pr_err("Uknown TMR function: 0x%02x.\n",
2883 tmr->response = TMR_FUNCTION_REJECTED;
2887 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
2888 cmd->se_tfo->queue_tm_rsp(cmd);
2890 transport_cmd_check_stop_to_fabric(cmd);
2893 int transport_generic_handle_tmr(
2896 unsigned long flags;
2898 spin_lock_irqsave(&cmd->t_state_lock, flags);
2899 cmd->transport_state |= CMD_T_ACTIVE;
2900 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2902 INIT_WORK(&cmd->work, target_tmr_work);
2903 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
2906 EXPORT_SYMBOL(transport_generic_handle_tmr);