1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * (c) Copyright 2002-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/net.h>
27 #include <linux/delay.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/slab.h>
31 #include <linux/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 #define CREATE_TRACE_POINTS
56 #include <trace/events/target.h>
58 static struct workqueue_struct *target_completion_wq;
59 static struct kmem_cache *se_sess_cache;
60 struct kmem_cache *se_ua_cache;
61 struct kmem_cache *t10_pr_reg_cache;
62 struct kmem_cache *t10_alua_lu_gp_cache;
63 struct kmem_cache *t10_alua_lu_gp_mem_cache;
64 struct kmem_cache *t10_alua_tg_pt_gp_cache;
65 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
67 static void transport_complete_task_attr(struct se_cmd *cmd);
68 static void transport_handle_queue_full(struct se_cmd *cmd,
69 struct se_device *dev);
70 static int transport_put_cmd(struct se_cmd *cmd);
71 static void target_complete_ok_work(struct work_struct *work);
73 int init_se_kmem_caches(void)
75 se_sess_cache = kmem_cache_create("se_sess_cache",
76 sizeof(struct se_session), __alignof__(struct se_session),
79 pr_err("kmem_cache_create() for struct se_session"
83 se_ua_cache = kmem_cache_create("se_ua_cache",
84 sizeof(struct se_ua), __alignof__(struct se_ua),
87 pr_err("kmem_cache_create() for struct se_ua failed\n");
88 goto out_free_sess_cache;
90 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
91 sizeof(struct t10_pr_registration),
92 __alignof__(struct t10_pr_registration), 0, NULL);
93 if (!t10_pr_reg_cache) {
94 pr_err("kmem_cache_create() for struct t10_pr_registration"
96 goto out_free_ua_cache;
98 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
99 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
101 if (!t10_alua_lu_gp_cache) {
102 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
104 goto out_free_pr_reg_cache;
106 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
107 sizeof(struct t10_alua_lu_gp_member),
108 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
109 if (!t10_alua_lu_gp_mem_cache) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
112 goto out_free_lu_gp_cache;
114 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
115 sizeof(struct t10_alua_tg_pt_gp),
116 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
117 if (!t10_alua_tg_pt_gp_cache) {
118 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
120 goto out_free_lu_gp_mem_cache;
122 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
123 "t10_alua_tg_pt_gp_mem_cache",
124 sizeof(struct t10_alua_tg_pt_gp_member),
125 __alignof__(struct t10_alua_tg_pt_gp_member),
127 if (!t10_alua_tg_pt_gp_mem_cache) {
128 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
130 goto out_free_tg_pt_gp_cache;
133 target_completion_wq = alloc_workqueue("target_completion",
135 if (!target_completion_wq)
136 goto out_free_tg_pt_gp_mem_cache;
140 out_free_tg_pt_gp_mem_cache:
141 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
142 out_free_tg_pt_gp_cache:
143 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
144 out_free_lu_gp_mem_cache:
145 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
146 out_free_lu_gp_cache:
147 kmem_cache_destroy(t10_alua_lu_gp_cache);
148 out_free_pr_reg_cache:
149 kmem_cache_destroy(t10_pr_reg_cache);
151 kmem_cache_destroy(se_ua_cache);
153 kmem_cache_destroy(se_sess_cache);
158 void release_se_kmem_caches(void)
160 destroy_workqueue(target_completion_wq);
161 kmem_cache_destroy(se_sess_cache);
162 kmem_cache_destroy(se_ua_cache);
163 kmem_cache_destroy(t10_pr_reg_cache);
164 kmem_cache_destroy(t10_alua_lu_gp_cache);
165 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
170 /* This code ensures unique mib indexes are handed out. */
171 static DEFINE_SPINLOCK(scsi_mib_index_lock);
172 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
175 * Allocate a new row index for the entry type specified
177 u32 scsi_get_new_index(scsi_index_t type)
181 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
183 spin_lock(&scsi_mib_index_lock);
184 new_index = ++scsi_mib_index[type];
185 spin_unlock(&scsi_mib_index_lock);
190 void transport_subsystem_check_init(void)
193 static int sub_api_initialized;
195 if (sub_api_initialized)
198 ret = request_module("target_core_iblock");
200 pr_err("Unable to load target_core_iblock\n");
202 ret = request_module("target_core_file");
204 pr_err("Unable to load target_core_file\n");
206 ret = request_module("target_core_pscsi");
208 pr_err("Unable to load target_core_pscsi\n");
210 sub_api_initialized = 1;
213 struct se_session *transport_init_session(void)
215 struct se_session *se_sess;
217 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
219 pr_err("Unable to allocate struct se_session from"
221 return ERR_PTR(-ENOMEM);
223 INIT_LIST_HEAD(&se_sess->sess_list);
224 INIT_LIST_HEAD(&se_sess->sess_acl_list);
225 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
226 INIT_LIST_HEAD(&se_sess->sess_wait_list);
227 spin_lock_init(&se_sess->sess_cmd_lock);
228 kref_init(&se_sess->sess_kref);
232 EXPORT_SYMBOL(transport_init_session);
234 int transport_alloc_session_tags(struct se_session *se_sess,
235 unsigned int tag_num, unsigned int tag_size)
239 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, GFP_KERNEL);
240 if (!se_sess->sess_cmd_map) {
241 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
245 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
247 pr_err("Unable to init se_sess->sess_tag_pool,"
248 " tag_num: %u\n", tag_num);
249 kfree(se_sess->sess_cmd_map);
250 se_sess->sess_cmd_map = NULL;
256 EXPORT_SYMBOL(transport_alloc_session_tags);
258 struct se_session *transport_init_session_tags(unsigned int tag_num,
259 unsigned int tag_size)
261 struct se_session *se_sess;
264 se_sess = transport_init_session();
268 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
270 transport_free_session(se_sess);
271 return ERR_PTR(-ENOMEM);
276 EXPORT_SYMBOL(transport_init_session_tags);
279 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
281 void __transport_register_session(
282 struct se_portal_group *se_tpg,
283 struct se_node_acl *se_nacl,
284 struct se_session *se_sess,
285 void *fabric_sess_ptr)
287 unsigned char buf[PR_REG_ISID_LEN];
289 se_sess->se_tpg = se_tpg;
290 se_sess->fabric_sess_ptr = fabric_sess_ptr;
292 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
294 * Only set for struct se_session's that will actually be moving I/O.
295 * eg: *NOT* discovery sessions.
299 * If the fabric module supports an ISID based TransportID,
300 * save this value in binary from the fabric I_T Nexus now.
302 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
303 memset(&buf[0], 0, PR_REG_ISID_LEN);
304 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
305 &buf[0], PR_REG_ISID_LEN);
306 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
308 kref_get(&se_nacl->acl_kref);
310 spin_lock_irq(&se_nacl->nacl_sess_lock);
312 * The se_nacl->nacl_sess pointer will be set to the
313 * last active I_T Nexus for each struct se_node_acl.
315 se_nacl->nacl_sess = se_sess;
317 list_add_tail(&se_sess->sess_acl_list,
318 &se_nacl->acl_sess_list);
319 spin_unlock_irq(&se_nacl->nacl_sess_lock);
321 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
323 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
324 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
326 EXPORT_SYMBOL(__transport_register_session);
328 void transport_register_session(
329 struct se_portal_group *se_tpg,
330 struct se_node_acl *se_nacl,
331 struct se_session *se_sess,
332 void *fabric_sess_ptr)
336 spin_lock_irqsave(&se_tpg->session_lock, flags);
337 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
338 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
340 EXPORT_SYMBOL(transport_register_session);
342 static void target_release_session(struct kref *kref)
344 struct se_session *se_sess = container_of(kref,
345 struct se_session, sess_kref);
346 struct se_portal_group *se_tpg = se_sess->se_tpg;
348 se_tpg->se_tpg_tfo->close_session(se_sess);
351 void target_get_session(struct se_session *se_sess)
353 kref_get(&se_sess->sess_kref);
355 EXPORT_SYMBOL(target_get_session);
357 void target_put_session(struct se_session *se_sess)
359 struct se_portal_group *tpg = se_sess->se_tpg;
361 if (tpg->se_tpg_tfo->put_session != NULL) {
362 tpg->se_tpg_tfo->put_session(se_sess);
365 kref_put(&se_sess->sess_kref, target_release_session);
367 EXPORT_SYMBOL(target_put_session);
369 static void target_complete_nacl(struct kref *kref)
371 struct se_node_acl *nacl = container_of(kref,
372 struct se_node_acl, acl_kref);
374 complete(&nacl->acl_free_comp);
377 void target_put_nacl(struct se_node_acl *nacl)
379 kref_put(&nacl->acl_kref, target_complete_nacl);
382 void transport_deregister_session_configfs(struct se_session *se_sess)
384 struct se_node_acl *se_nacl;
387 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
389 se_nacl = se_sess->se_node_acl;
391 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
392 if (se_nacl->acl_stop == 0)
393 list_del(&se_sess->sess_acl_list);
395 * If the session list is empty, then clear the pointer.
396 * Otherwise, set the struct se_session pointer from the tail
397 * element of the per struct se_node_acl active session list.
399 if (list_empty(&se_nacl->acl_sess_list))
400 se_nacl->nacl_sess = NULL;
402 se_nacl->nacl_sess = container_of(
403 se_nacl->acl_sess_list.prev,
404 struct se_session, sess_acl_list);
406 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
409 EXPORT_SYMBOL(transport_deregister_session_configfs);
411 void transport_free_session(struct se_session *se_sess)
413 if (se_sess->sess_cmd_map) {
414 percpu_ida_destroy(&se_sess->sess_tag_pool);
415 kfree(se_sess->sess_cmd_map);
417 kmem_cache_free(se_sess_cache, se_sess);
419 EXPORT_SYMBOL(transport_free_session);
421 void transport_deregister_session(struct se_session *se_sess)
423 struct se_portal_group *se_tpg = se_sess->se_tpg;
424 struct target_core_fabric_ops *se_tfo;
425 struct se_node_acl *se_nacl;
427 bool comp_nacl = true;
430 transport_free_session(se_sess);
433 se_tfo = se_tpg->se_tpg_tfo;
435 spin_lock_irqsave(&se_tpg->session_lock, flags);
436 list_del(&se_sess->sess_list);
437 se_sess->se_tpg = NULL;
438 se_sess->fabric_sess_ptr = NULL;
439 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
442 * Determine if we need to do extra work for this initiator node's
443 * struct se_node_acl if it had been previously dynamically generated.
445 se_nacl = se_sess->se_node_acl;
447 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
448 if (se_nacl && se_nacl->dynamic_node_acl) {
449 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
450 list_del(&se_nacl->acl_list);
451 se_tpg->num_node_acls--;
452 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
453 core_tpg_wait_for_nacl_pr_ref(se_nacl);
454 core_free_device_list_for_node(se_nacl, se_tpg);
455 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
458 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
461 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
463 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
464 se_tpg->se_tpg_tfo->get_fabric_name());
466 * If last kref is dropping now for an explict NodeACL, awake sleeping
467 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
470 if (se_nacl && comp_nacl == true)
471 target_put_nacl(se_nacl);
473 transport_free_session(se_sess);
475 EXPORT_SYMBOL(transport_deregister_session);
478 * Called with cmd->t_state_lock held.
480 static void target_remove_from_state_list(struct se_cmd *cmd)
482 struct se_device *dev = cmd->se_dev;
488 if (cmd->transport_state & CMD_T_BUSY)
491 spin_lock_irqsave(&dev->execute_task_lock, flags);
492 if (cmd->state_active) {
493 list_del(&cmd->state_list);
494 cmd->state_active = false;
496 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
499 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
504 spin_lock_irqsave(&cmd->t_state_lock, flags);
506 cmd->t_state = TRANSPORT_WRITE_PENDING;
509 * Determine if IOCTL context caller in requesting the stopping of this
510 * command for LUN shutdown purposes.
512 if (cmd->transport_state & CMD_T_LUN_STOP) {
513 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
514 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
516 cmd->transport_state &= ~CMD_T_ACTIVE;
517 if (remove_from_lists)
518 target_remove_from_state_list(cmd);
519 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
521 complete(&cmd->transport_lun_stop_comp);
525 if (remove_from_lists) {
526 target_remove_from_state_list(cmd);
529 * Clear struct se_cmd->se_lun before the handoff to FE.
535 * Determine if frontend context caller is requesting the stopping of
536 * this command for frontend exceptions.
538 if (cmd->transport_state & CMD_T_STOP) {
539 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
541 cmd->se_tfo->get_task_tag(cmd));
543 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
545 complete(&cmd->t_transport_stop_comp);
549 cmd->transport_state &= ~CMD_T_ACTIVE;
550 if (remove_from_lists) {
552 * Some fabric modules like tcm_loop can release
553 * their internally allocated I/O reference now and
556 * Fabric modules are expected to return '1' here if the
557 * se_cmd being passed is released at this point,
558 * or zero if not being released.
560 if (cmd->se_tfo->check_stop_free != NULL) {
561 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
562 return cmd->se_tfo->check_stop_free(cmd);
566 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
570 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
572 return transport_cmd_check_stop(cmd, true, false);
575 static void transport_lun_remove_cmd(struct se_cmd *cmd)
577 struct se_lun *lun = cmd->se_lun;
583 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
584 if (!list_empty(&cmd->se_lun_node))
585 list_del_init(&cmd->se_lun_node);
586 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
589 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
591 if (transport_cmd_check_stop_to_fabric(cmd))
594 transport_put_cmd(cmd);
597 static void target_complete_failure_work(struct work_struct *work)
599 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
601 transport_generic_request_failure(cmd,
602 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
606 * Used when asking transport to copy Sense Data from the underlying
607 * Linux/SCSI struct scsi_cmnd
609 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
611 struct se_device *dev = cmd->se_dev;
613 WARN_ON(!cmd->se_lun);
618 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
621 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
623 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
624 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
625 return cmd->sense_buffer;
628 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
630 struct se_device *dev = cmd->se_dev;
631 int success = scsi_status == GOOD;
634 cmd->scsi_status = scsi_status;
637 spin_lock_irqsave(&cmd->t_state_lock, flags);
638 cmd->transport_state &= ~CMD_T_BUSY;
640 if (dev && dev->transport->transport_complete) {
641 dev->transport->transport_complete(cmd,
643 transport_get_sense_buffer(cmd));
644 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
649 * See if we are waiting to complete for an exception condition.
651 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
652 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
653 complete(&cmd->task_stop_comp);
658 cmd->transport_state |= CMD_T_FAILED;
661 * Check for case where an explict ABORT_TASK has been received
662 * and transport_wait_for_tasks() will be waiting for completion..
664 if (cmd->transport_state & CMD_T_ABORTED &&
665 cmd->transport_state & CMD_T_STOP) {
666 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
667 complete(&cmd->t_transport_stop_comp);
669 } else if (cmd->transport_state & CMD_T_FAILED) {
670 INIT_WORK(&cmd->work, target_complete_failure_work);
672 INIT_WORK(&cmd->work, target_complete_ok_work);
675 cmd->t_state = TRANSPORT_COMPLETE;
676 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
677 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
679 queue_work(target_completion_wq, &cmd->work);
681 EXPORT_SYMBOL(target_complete_cmd);
683 static void target_add_to_state_list(struct se_cmd *cmd)
685 struct se_device *dev = cmd->se_dev;
688 spin_lock_irqsave(&dev->execute_task_lock, flags);
689 if (!cmd->state_active) {
690 list_add_tail(&cmd->state_list, &dev->state_list);
691 cmd->state_active = true;
693 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
697 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
699 static void transport_write_pending_qf(struct se_cmd *cmd);
700 static void transport_complete_qf(struct se_cmd *cmd);
702 void target_qf_do_work(struct work_struct *work)
704 struct se_device *dev = container_of(work, struct se_device,
706 LIST_HEAD(qf_cmd_list);
707 struct se_cmd *cmd, *cmd_tmp;
709 spin_lock_irq(&dev->qf_cmd_lock);
710 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
711 spin_unlock_irq(&dev->qf_cmd_lock);
713 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
714 list_del(&cmd->se_qf_node);
715 atomic_dec(&dev->dev_qf_count);
716 smp_mb__after_atomic_dec();
718 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
719 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
720 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
721 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
724 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
725 transport_write_pending_qf(cmd);
726 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
727 transport_complete_qf(cmd);
731 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
733 switch (cmd->data_direction) {
736 case DMA_FROM_DEVICE:
740 case DMA_BIDIRECTIONAL:
749 void transport_dump_dev_state(
750 struct se_device *dev,
754 *bl += sprintf(b + *bl, "Status: ");
755 if (dev->export_count)
756 *bl += sprintf(b + *bl, "ACTIVATED");
758 *bl += sprintf(b + *bl, "DEACTIVATED");
760 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
761 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
762 dev->dev_attrib.block_size,
763 dev->dev_attrib.hw_max_sectors);
764 *bl += sprintf(b + *bl, " ");
767 void transport_dump_vpd_proto_id(
769 unsigned char *p_buf,
772 unsigned char buf[VPD_TMP_BUF_SIZE];
775 memset(buf, 0, VPD_TMP_BUF_SIZE);
776 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
778 switch (vpd->protocol_identifier) {
780 sprintf(buf+len, "Fibre Channel\n");
783 sprintf(buf+len, "Parallel SCSI\n");
786 sprintf(buf+len, "SSA\n");
789 sprintf(buf+len, "IEEE 1394\n");
792 sprintf(buf+len, "SCSI Remote Direct Memory Access"
796 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
799 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
802 sprintf(buf+len, "Automation/Drive Interface Transport"
806 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
809 sprintf(buf+len, "Unknown 0x%02x\n",
810 vpd->protocol_identifier);
815 strncpy(p_buf, buf, p_buf_len);
821 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
824 * Check if the Protocol Identifier Valid (PIV) bit is set..
826 * from spc3r23.pdf section 7.5.1
828 if (page_83[1] & 0x80) {
829 vpd->protocol_identifier = (page_83[0] & 0xf0);
830 vpd->protocol_identifier_set = 1;
831 transport_dump_vpd_proto_id(vpd, NULL, 0);
834 EXPORT_SYMBOL(transport_set_vpd_proto_id);
836 int transport_dump_vpd_assoc(
838 unsigned char *p_buf,
841 unsigned char buf[VPD_TMP_BUF_SIZE];
845 memset(buf, 0, VPD_TMP_BUF_SIZE);
846 len = sprintf(buf, "T10 VPD Identifier Association: ");
848 switch (vpd->association) {
850 sprintf(buf+len, "addressed logical unit\n");
853 sprintf(buf+len, "target port\n");
856 sprintf(buf+len, "SCSI target device\n");
859 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
865 strncpy(p_buf, buf, p_buf_len);
872 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
875 * The VPD identification association..
877 * from spc3r23.pdf Section 7.6.3.1 Table 297
879 vpd->association = (page_83[1] & 0x30);
880 return transport_dump_vpd_assoc(vpd, NULL, 0);
882 EXPORT_SYMBOL(transport_set_vpd_assoc);
884 int transport_dump_vpd_ident_type(
886 unsigned char *p_buf,
889 unsigned char buf[VPD_TMP_BUF_SIZE];
893 memset(buf, 0, VPD_TMP_BUF_SIZE);
894 len = sprintf(buf, "T10 VPD Identifier Type: ");
896 switch (vpd->device_identifier_type) {
898 sprintf(buf+len, "Vendor specific\n");
901 sprintf(buf+len, "T10 Vendor ID based\n");
904 sprintf(buf+len, "EUI-64 based\n");
907 sprintf(buf+len, "NAA\n");
910 sprintf(buf+len, "Relative target port identifier\n");
913 sprintf(buf+len, "SCSI name string\n");
916 sprintf(buf+len, "Unsupported: 0x%02x\n",
917 vpd->device_identifier_type);
923 if (p_buf_len < strlen(buf)+1)
925 strncpy(p_buf, buf, p_buf_len);
933 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
936 * The VPD identifier type..
938 * from spc3r23.pdf Section 7.6.3.1 Table 298
940 vpd->device_identifier_type = (page_83[1] & 0x0f);
941 return transport_dump_vpd_ident_type(vpd, NULL, 0);
943 EXPORT_SYMBOL(transport_set_vpd_ident_type);
945 int transport_dump_vpd_ident(
947 unsigned char *p_buf,
950 unsigned char buf[VPD_TMP_BUF_SIZE];
953 memset(buf, 0, VPD_TMP_BUF_SIZE);
955 switch (vpd->device_identifier_code_set) {
956 case 0x01: /* Binary */
957 snprintf(buf, sizeof(buf),
958 "T10 VPD Binary Device Identifier: %s\n",
959 &vpd->device_identifier[0]);
961 case 0x02: /* ASCII */
962 snprintf(buf, sizeof(buf),
963 "T10 VPD ASCII Device Identifier: %s\n",
964 &vpd->device_identifier[0]);
966 case 0x03: /* UTF-8 */
967 snprintf(buf, sizeof(buf),
968 "T10 VPD UTF-8 Device Identifier: %s\n",
969 &vpd->device_identifier[0]);
972 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
973 " 0x%02x", vpd->device_identifier_code_set);
979 strncpy(p_buf, buf, p_buf_len);
987 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
989 static const char hex_str[] = "0123456789abcdef";
990 int j = 0, i = 4; /* offset to start of the identifier */
993 * The VPD Code Set (encoding)
995 * from spc3r23.pdf Section 7.6.3.1 Table 296
997 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
998 switch (vpd->device_identifier_code_set) {
999 case 0x01: /* Binary */
1000 vpd->device_identifier[j++] =
1001 hex_str[vpd->device_identifier_type];
1002 while (i < (4 + page_83[3])) {
1003 vpd->device_identifier[j++] =
1004 hex_str[(page_83[i] & 0xf0) >> 4];
1005 vpd->device_identifier[j++] =
1006 hex_str[page_83[i] & 0x0f];
1010 case 0x02: /* ASCII */
1011 case 0x03: /* UTF-8 */
1012 while (i < (4 + page_83[3]))
1013 vpd->device_identifier[j++] = page_83[i++];
1019 return transport_dump_vpd_ident(vpd, NULL, 0);
1021 EXPORT_SYMBOL(transport_set_vpd_ident);
1024 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1026 struct se_device *dev = cmd->se_dev;
1028 if (cmd->unknown_data_length) {
1029 cmd->data_length = size;
1030 } else if (size != cmd->data_length) {
1031 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1032 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1033 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1034 cmd->data_length, size, cmd->t_task_cdb[0]);
1036 if (cmd->data_direction == DMA_TO_DEVICE) {
1037 pr_err("Rejecting underflow/overflow"
1039 return TCM_INVALID_CDB_FIELD;
1042 * Reject READ_* or WRITE_* with overflow/underflow for
1043 * type SCF_SCSI_DATA_CDB.
1045 if (dev->dev_attrib.block_size != 512) {
1046 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1047 " CDB on non 512-byte sector setup subsystem"
1048 " plugin: %s\n", dev->transport->name);
1049 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1050 return TCM_INVALID_CDB_FIELD;
1053 * For the overflow case keep the existing fabric provided
1054 * ->data_length. Otherwise for the underflow case, reset
1055 * ->data_length to the smaller SCSI expected data transfer
1058 if (size > cmd->data_length) {
1059 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1060 cmd->residual_count = (size - cmd->data_length);
1062 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1063 cmd->residual_count = (cmd->data_length - size);
1064 cmd->data_length = size;
1073 * Used by fabric modules containing a local struct se_cmd within their
1074 * fabric dependent per I/O descriptor.
1076 void transport_init_se_cmd(
1078 struct target_core_fabric_ops *tfo,
1079 struct se_session *se_sess,
1083 unsigned char *sense_buffer)
1085 INIT_LIST_HEAD(&cmd->se_lun_node);
1086 INIT_LIST_HEAD(&cmd->se_delayed_node);
1087 INIT_LIST_HEAD(&cmd->se_qf_node);
1088 INIT_LIST_HEAD(&cmd->se_cmd_list);
1089 INIT_LIST_HEAD(&cmd->state_list);
1090 init_completion(&cmd->transport_lun_fe_stop_comp);
1091 init_completion(&cmd->transport_lun_stop_comp);
1092 init_completion(&cmd->t_transport_stop_comp);
1093 init_completion(&cmd->cmd_wait_comp);
1094 init_completion(&cmd->task_stop_comp);
1095 spin_lock_init(&cmd->t_state_lock);
1096 cmd->transport_state = CMD_T_DEV_ACTIVE;
1099 cmd->se_sess = se_sess;
1100 cmd->data_length = data_length;
1101 cmd->data_direction = data_direction;
1102 cmd->sam_task_attr = task_attr;
1103 cmd->sense_buffer = sense_buffer;
1105 cmd->state_active = false;
1107 EXPORT_SYMBOL(transport_init_se_cmd);
1109 static sense_reason_t
1110 transport_check_alloc_task_attr(struct se_cmd *cmd)
1112 struct se_device *dev = cmd->se_dev;
1115 * Check if SAM Task Attribute emulation is enabled for this
1116 * struct se_device storage object
1118 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1121 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1122 pr_debug("SAM Task Attribute ACA"
1123 " emulation is not supported\n");
1124 return TCM_INVALID_CDB_FIELD;
1127 * Used to determine when ORDERED commands should go from
1128 * Dormant to Active status.
1130 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1131 smp_mb__after_atomic_inc();
1132 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1133 cmd->se_ordered_id, cmd->sam_task_attr,
1134 dev->transport->name);
1139 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1141 struct se_device *dev = cmd->se_dev;
1145 * Ensure that the received CDB is less than the max (252 + 8) bytes
1146 * for VARIABLE_LENGTH_CMD
1148 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1149 pr_err("Received SCSI CDB with command_size: %d that"
1150 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1151 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1152 return TCM_INVALID_CDB_FIELD;
1155 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1156 * allocate the additional extended CDB buffer now.. Otherwise
1157 * setup the pointer from __t_task_cdb to t_task_cdb.
1159 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1160 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1162 if (!cmd->t_task_cdb) {
1163 pr_err("Unable to allocate cmd->t_task_cdb"
1164 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1165 scsi_command_size(cdb),
1166 (unsigned long)sizeof(cmd->__t_task_cdb));
1167 return TCM_OUT_OF_RESOURCES;
1170 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1172 * Copy the original CDB into cmd->
1174 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1176 trace_target_sequencer_start(cmd);
1179 * Check for an existing UNIT ATTENTION condition
1181 ret = target_scsi3_ua_check(cmd);
1185 ret = target_alua_state_check(cmd);
1189 ret = target_check_reservation(cmd);
1191 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1195 ret = dev->transport->parse_cdb(cmd);
1199 ret = transport_check_alloc_task_attr(cmd);
1203 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1205 spin_lock(&cmd->se_lun->lun_sep_lock);
1206 if (cmd->se_lun->lun_sep)
1207 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1208 spin_unlock(&cmd->se_lun->lun_sep_lock);
1211 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1214 * Used by fabric module frontends to queue tasks directly.
1215 * Many only be used from process context only
1217 int transport_handle_cdb_direct(
1224 pr_err("cmd->se_lun is NULL\n");
1227 if (in_interrupt()) {
1229 pr_err("transport_generic_handle_cdb cannot be called"
1230 " from interrupt context\n");
1234 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1235 * outstanding descriptors are handled correctly during shutdown via
1236 * transport_wait_for_tasks()
1238 * Also, we don't take cmd->t_state_lock here as we only expect
1239 * this to be called for initial descriptor submission.
1241 cmd->t_state = TRANSPORT_NEW_CMD;
1242 cmd->transport_state |= CMD_T_ACTIVE;
1245 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1246 * so follow TRANSPORT_NEW_CMD processing thread context usage
1247 * and call transport_generic_request_failure() if necessary..
1249 ret = transport_generic_new_cmd(cmd);
1251 transport_generic_request_failure(cmd, ret);
1254 EXPORT_SYMBOL(transport_handle_cdb_direct);
1257 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1258 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1260 if (!sgl || !sgl_count)
1264 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1265 * scatterlists already have been set to follow what the fabric
1266 * passes for the original expected data transfer length.
1268 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1269 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1270 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1271 return TCM_INVALID_CDB_FIELD;
1274 cmd->t_data_sg = sgl;
1275 cmd->t_data_nents = sgl_count;
1277 if (sgl_bidi && sgl_bidi_count) {
1278 cmd->t_bidi_data_sg = sgl_bidi;
1279 cmd->t_bidi_data_nents = sgl_bidi_count;
1281 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1286 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1287 * se_cmd + use pre-allocated SGL memory.
1289 * @se_cmd: command descriptor to submit
1290 * @se_sess: associated se_sess for endpoint
1291 * @cdb: pointer to SCSI CDB
1292 * @sense: pointer to SCSI sense buffer
1293 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1294 * @data_length: fabric expected data transfer length
1295 * @task_addr: SAM task attribute
1296 * @data_dir: DMA data direction
1297 * @flags: flags for command submission from target_sc_flags_tables
1298 * @sgl: struct scatterlist memory for unidirectional mapping
1299 * @sgl_count: scatterlist count for unidirectional mapping
1300 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1301 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1303 * Returns non zero to signal active I/O shutdown failure. All other
1304 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1305 * but still return zero here.
1307 * This may only be called from process context, and also currently
1308 * assumes internal allocation of fabric payload buffer by target-core.
1310 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1311 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1312 u32 data_length, int task_attr, int data_dir, int flags,
1313 struct scatterlist *sgl, u32 sgl_count,
1314 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1316 struct se_portal_group *se_tpg;
1320 se_tpg = se_sess->se_tpg;
1322 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1323 BUG_ON(in_interrupt());
1325 * Initialize se_cmd for target operation. From this point
1326 * exceptions are handled by sending exception status via
1327 * target_core_fabric_ops->queue_status() callback
1329 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1330 data_length, data_dir, task_attr, sense);
1331 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1332 se_cmd->unknown_data_length = 1;
1334 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1335 * se_sess->sess_cmd_list. A second kref_get here is necessary
1336 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1337 * kref_put() to happen during fabric packet acknowledgement.
1339 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1343 * Signal bidirectional data payloads to target-core
1345 if (flags & TARGET_SCF_BIDI_OP)
1346 se_cmd->se_cmd_flags |= SCF_BIDI;
1348 * Locate se_lun pointer and attach it to struct se_cmd
1350 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1352 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1353 target_put_sess_cmd(se_sess, se_cmd);
1357 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1359 transport_generic_request_failure(se_cmd, rc);
1363 * When a non zero sgl_count has been passed perform SGL passthrough
1364 * mapping for pre-allocated fabric memory instead of having target
1365 * core perform an internal SGL allocation..
1367 if (sgl_count != 0) {
1371 * A work-around for tcm_loop as some userspace code via
1372 * scsi-generic do not memset their associated read buffers,
1373 * so go ahead and do that here for type non-data CDBs. Also
1374 * note that this is currently guaranteed to be a single SGL
1375 * for this case by target core in target_setup_cmd_from_cdb()
1376 * -> transport_generic_cmd_sequencer().
1378 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1379 se_cmd->data_direction == DMA_FROM_DEVICE) {
1380 unsigned char *buf = NULL;
1383 buf = kmap(sg_page(sgl)) + sgl->offset;
1386 memset(buf, 0, sgl->length);
1387 kunmap(sg_page(sgl));
1391 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1392 sgl_bidi, sgl_bidi_count);
1394 transport_generic_request_failure(se_cmd, rc);
1399 * Check if we need to delay processing because of ALUA
1400 * Active/NonOptimized primary access state..
1402 core_alua_check_nonop_delay(se_cmd);
1404 transport_handle_cdb_direct(se_cmd);
1407 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1410 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1412 * @se_cmd: command descriptor to submit
1413 * @se_sess: associated se_sess for endpoint
1414 * @cdb: pointer to SCSI CDB
1415 * @sense: pointer to SCSI sense buffer
1416 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1417 * @data_length: fabric expected data transfer length
1418 * @task_addr: SAM task attribute
1419 * @data_dir: DMA data direction
1420 * @flags: flags for command submission from target_sc_flags_tables
1422 * Returns non zero to signal active I/O shutdown failure. All other
1423 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1424 * but still return zero here.
1426 * This may only be called from process context, and also currently
1427 * assumes internal allocation of fabric payload buffer by target-core.
1429 * It also assumes interal target core SGL memory allocation.
1431 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1432 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1433 u32 data_length, int task_attr, int data_dir, int flags)
1435 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1436 unpacked_lun, data_length, task_attr, data_dir,
1437 flags, NULL, 0, NULL, 0);
1439 EXPORT_SYMBOL(target_submit_cmd);
1441 static void target_complete_tmr_failure(struct work_struct *work)
1443 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1445 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1446 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1448 transport_cmd_check_stop_to_fabric(se_cmd);
1452 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1455 * @se_cmd: command descriptor to submit
1456 * @se_sess: associated se_sess for endpoint
1457 * @sense: pointer to SCSI sense buffer
1458 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1459 * @fabric_context: fabric context for TMR req
1460 * @tm_type: Type of TM request
1461 * @gfp: gfp type for caller
1462 * @tag: referenced task tag for TMR_ABORT_TASK
1463 * @flags: submit cmd flags
1465 * Callable from all contexts.
1468 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1469 unsigned char *sense, u32 unpacked_lun,
1470 void *fabric_tmr_ptr, unsigned char tm_type,
1471 gfp_t gfp, unsigned int tag, int flags)
1473 struct se_portal_group *se_tpg;
1476 se_tpg = se_sess->se_tpg;
1479 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1480 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1482 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1483 * allocation failure.
1485 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1489 if (tm_type == TMR_ABORT_TASK)
1490 se_cmd->se_tmr_req->ref_task_tag = tag;
1492 /* See target_submit_cmd for commentary */
1493 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1495 core_tmr_release_req(se_cmd->se_tmr_req);
1499 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1502 * For callback during failure handling, push this work off
1503 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1505 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1506 schedule_work(&se_cmd->work);
1509 transport_generic_handle_tmr(se_cmd);
1512 EXPORT_SYMBOL(target_submit_tmr);
1515 * If the cmd is active, request it to be stopped and sleep until it
1518 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1520 bool was_active = false;
1522 if (cmd->transport_state & CMD_T_BUSY) {
1523 cmd->transport_state |= CMD_T_REQUEST_STOP;
1524 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1526 pr_debug("cmd %p waiting to complete\n", cmd);
1527 wait_for_completion(&cmd->task_stop_comp);
1528 pr_debug("cmd %p stopped successfully\n", cmd);
1530 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1531 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1532 cmd->transport_state &= ~CMD_T_BUSY;
1540 * Handle SAM-esque emulation for generic transport request failures.
1542 void transport_generic_request_failure(struct se_cmd *cmd,
1543 sense_reason_t sense_reason)
1547 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1548 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1549 cmd->t_task_cdb[0]);
1550 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1551 cmd->se_tfo->get_cmd_state(cmd),
1552 cmd->t_state, sense_reason);
1553 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1554 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1555 (cmd->transport_state & CMD_T_STOP) != 0,
1556 (cmd->transport_state & CMD_T_SENT) != 0);
1559 * For SAM Task Attribute emulation for failed struct se_cmd
1561 transport_complete_task_attr(cmd);
1563 * Handle special case for COMPARE_AND_WRITE failure, where the
1564 * callback is expected to drop the per device ->caw_mutex.
1566 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1567 cmd->transport_complete_callback)
1568 cmd->transport_complete_callback(cmd);
1570 switch (sense_reason) {
1571 case TCM_NON_EXISTENT_LUN:
1572 case TCM_UNSUPPORTED_SCSI_OPCODE:
1573 case TCM_INVALID_CDB_FIELD:
1574 case TCM_INVALID_PARAMETER_LIST:
1575 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1576 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1577 case TCM_UNKNOWN_MODE_PAGE:
1578 case TCM_WRITE_PROTECTED:
1579 case TCM_ADDRESS_OUT_OF_RANGE:
1580 case TCM_CHECK_CONDITION_ABORT_CMD:
1581 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1582 case TCM_CHECK_CONDITION_NOT_READY:
1584 case TCM_OUT_OF_RESOURCES:
1585 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1587 case TCM_RESERVATION_CONFLICT:
1589 * No SENSE Data payload for this case, set SCSI Status
1590 * and queue the response to $FABRIC_MOD.
1592 * Uses linux/include/scsi/scsi.h SAM status codes defs
1594 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1596 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1597 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1600 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1603 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1604 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1605 cmd->orig_fe_lun, 0x2C,
1606 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1608 trace_target_cmd_complete(cmd);
1609 ret = cmd->se_tfo-> queue_status(cmd);
1610 if (ret == -EAGAIN || ret == -ENOMEM)
1614 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1615 cmd->t_task_cdb[0], sense_reason);
1616 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1620 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1621 if (ret == -EAGAIN || ret == -ENOMEM)
1625 transport_lun_remove_cmd(cmd);
1626 if (!transport_cmd_check_stop_to_fabric(cmd))
1631 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1632 transport_handle_queue_full(cmd, cmd->se_dev);
1634 EXPORT_SYMBOL(transport_generic_request_failure);
1636 void __target_execute_cmd(struct se_cmd *cmd)
1640 if (cmd->execute_cmd) {
1641 ret = cmd->execute_cmd(cmd);
1643 spin_lock_irq(&cmd->t_state_lock);
1644 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1645 spin_unlock_irq(&cmd->t_state_lock);
1647 transport_generic_request_failure(cmd, ret);
1652 static bool target_handle_task_attr(struct se_cmd *cmd)
1654 struct se_device *dev = cmd->se_dev;
1656 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1660 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1661 * to allow the passed struct se_cmd list of tasks to the front of the list.
1663 switch (cmd->sam_task_attr) {
1665 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1666 "se_ordered_id: %u\n",
1667 cmd->t_task_cdb[0], cmd->se_ordered_id);
1669 case MSG_ORDERED_TAG:
1670 atomic_inc(&dev->dev_ordered_sync);
1671 smp_mb__after_atomic_inc();
1673 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1674 " se_ordered_id: %u\n",
1675 cmd->t_task_cdb[0], cmd->se_ordered_id);
1678 * Execute an ORDERED command if no other older commands
1679 * exist that need to be completed first.
1681 if (!atomic_read(&dev->simple_cmds))
1686 * For SIMPLE and UNTAGGED Task Attribute commands
1688 atomic_inc(&dev->simple_cmds);
1689 smp_mb__after_atomic_inc();
1693 if (atomic_read(&dev->dev_ordered_sync) == 0)
1696 spin_lock(&dev->delayed_cmd_lock);
1697 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1698 spin_unlock(&dev->delayed_cmd_lock);
1700 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1701 " delayed CMD list, se_ordered_id: %u\n",
1702 cmd->t_task_cdb[0], cmd->sam_task_attr,
1703 cmd->se_ordered_id);
1707 void target_execute_cmd(struct se_cmd *cmd)
1710 * If the received CDB has aleady been aborted stop processing it here.
1712 if (transport_check_aborted_status(cmd, 1)) {
1713 complete(&cmd->transport_lun_stop_comp);
1718 * Determine if IOCTL context caller in requesting the stopping of this
1719 * command for LUN shutdown purposes.
1721 spin_lock_irq(&cmd->t_state_lock);
1722 if (cmd->transport_state & CMD_T_LUN_STOP) {
1723 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1724 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1726 cmd->transport_state &= ~CMD_T_ACTIVE;
1727 spin_unlock_irq(&cmd->t_state_lock);
1728 complete(&cmd->transport_lun_stop_comp);
1732 * Determine if frontend context caller is requesting the stopping of
1733 * this command for frontend exceptions.
1735 if (cmd->transport_state & CMD_T_STOP) {
1736 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1738 cmd->se_tfo->get_task_tag(cmd));
1740 spin_unlock_irq(&cmd->t_state_lock);
1741 complete(&cmd->t_transport_stop_comp);
1745 cmd->t_state = TRANSPORT_PROCESSING;
1746 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1747 spin_unlock_irq(&cmd->t_state_lock);
1749 if (target_handle_task_attr(cmd)) {
1750 spin_lock_irq(&cmd->t_state_lock);
1751 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1752 spin_unlock_irq(&cmd->t_state_lock);
1756 __target_execute_cmd(cmd);
1758 EXPORT_SYMBOL(target_execute_cmd);
1761 * Process all commands up to the last received ORDERED task attribute which
1762 * requires another blocking boundary
1764 static void target_restart_delayed_cmds(struct se_device *dev)
1769 spin_lock(&dev->delayed_cmd_lock);
1770 if (list_empty(&dev->delayed_cmd_list)) {
1771 spin_unlock(&dev->delayed_cmd_lock);
1775 cmd = list_entry(dev->delayed_cmd_list.next,
1776 struct se_cmd, se_delayed_node);
1777 list_del(&cmd->se_delayed_node);
1778 spin_unlock(&dev->delayed_cmd_lock);
1780 __target_execute_cmd(cmd);
1782 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1788 * Called from I/O completion to determine which dormant/delayed
1789 * and ordered cmds need to have their tasks added to the execution queue.
1791 static void transport_complete_task_attr(struct se_cmd *cmd)
1793 struct se_device *dev = cmd->se_dev;
1795 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1798 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1799 atomic_dec(&dev->simple_cmds);
1800 smp_mb__after_atomic_dec();
1801 dev->dev_cur_ordered_id++;
1802 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1803 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1804 cmd->se_ordered_id);
1805 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1806 dev->dev_cur_ordered_id++;
1807 pr_debug("Incremented dev_cur_ordered_id: %u for"
1808 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1809 cmd->se_ordered_id);
1810 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1811 atomic_dec(&dev->dev_ordered_sync);
1812 smp_mb__after_atomic_dec();
1814 dev->dev_cur_ordered_id++;
1815 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1816 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1819 target_restart_delayed_cmds(dev);
1822 static void transport_complete_qf(struct se_cmd *cmd)
1826 transport_complete_task_attr(cmd);
1828 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1829 trace_target_cmd_complete(cmd);
1830 ret = cmd->se_tfo->queue_status(cmd);
1835 switch (cmd->data_direction) {
1836 case DMA_FROM_DEVICE:
1837 trace_target_cmd_complete(cmd);
1838 ret = cmd->se_tfo->queue_data_in(cmd);
1841 if (cmd->se_cmd_flags & SCF_BIDI) {
1842 ret = cmd->se_tfo->queue_data_in(cmd);
1846 /* Fall through for DMA_TO_DEVICE */
1848 trace_target_cmd_complete(cmd);
1849 ret = cmd->se_tfo->queue_status(cmd);
1857 transport_handle_queue_full(cmd, cmd->se_dev);
1860 transport_lun_remove_cmd(cmd);
1861 transport_cmd_check_stop_to_fabric(cmd);
1864 static void transport_handle_queue_full(
1866 struct se_device *dev)
1868 spin_lock_irq(&dev->qf_cmd_lock);
1869 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1870 atomic_inc(&dev->dev_qf_count);
1871 smp_mb__after_atomic_inc();
1872 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1874 schedule_work(&cmd->se_dev->qf_work_queue);
1877 static void target_complete_ok_work(struct work_struct *work)
1879 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1883 * Check if we need to move delayed/dormant tasks from cmds on the
1884 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1887 transport_complete_task_attr(cmd);
1890 * Check to schedule QUEUE_FULL work, or execute an existing
1891 * cmd->transport_qf_callback()
1893 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1894 schedule_work(&cmd->se_dev->qf_work_queue);
1897 * Check if we need to send a sense buffer from
1898 * the struct se_cmd in question.
1900 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1901 WARN_ON(!cmd->scsi_status);
1902 ret = transport_send_check_condition_and_sense(
1904 if (ret == -EAGAIN || ret == -ENOMEM)
1907 transport_lun_remove_cmd(cmd);
1908 transport_cmd_check_stop_to_fabric(cmd);
1912 * Check for a callback, used by amongst other things
1913 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
1915 if (cmd->transport_complete_callback) {
1918 rc = cmd->transport_complete_callback(cmd);
1919 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
1922 ret = transport_send_check_condition_and_sense(cmd,
1924 if (ret == -EAGAIN || ret == -ENOMEM)
1927 transport_lun_remove_cmd(cmd);
1928 transport_cmd_check_stop_to_fabric(cmd);
1933 switch (cmd->data_direction) {
1934 case DMA_FROM_DEVICE:
1935 spin_lock(&cmd->se_lun->lun_sep_lock);
1936 if (cmd->se_lun->lun_sep) {
1937 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1940 spin_unlock(&cmd->se_lun->lun_sep_lock);
1942 trace_target_cmd_complete(cmd);
1943 ret = cmd->se_tfo->queue_data_in(cmd);
1944 if (ret == -EAGAIN || ret == -ENOMEM)
1948 spin_lock(&cmd->se_lun->lun_sep_lock);
1949 if (cmd->se_lun->lun_sep) {
1950 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
1953 spin_unlock(&cmd->se_lun->lun_sep_lock);
1955 * Check if we need to send READ payload for BIDI-COMMAND
1957 if (cmd->se_cmd_flags & SCF_BIDI) {
1958 spin_lock(&cmd->se_lun->lun_sep_lock);
1959 if (cmd->se_lun->lun_sep) {
1960 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1963 spin_unlock(&cmd->se_lun->lun_sep_lock);
1964 ret = cmd->se_tfo->queue_data_in(cmd);
1965 if (ret == -EAGAIN || ret == -ENOMEM)
1969 /* Fall through for DMA_TO_DEVICE */
1971 trace_target_cmd_complete(cmd);
1972 ret = cmd->se_tfo->queue_status(cmd);
1973 if (ret == -EAGAIN || ret == -ENOMEM)
1980 transport_lun_remove_cmd(cmd);
1981 transport_cmd_check_stop_to_fabric(cmd);
1985 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
1986 " data_direction: %d\n", cmd, cmd->data_direction);
1987 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1988 transport_handle_queue_full(cmd, cmd->se_dev);
1991 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
1993 struct scatterlist *sg;
1996 for_each_sg(sgl, sg, nents, count)
1997 __free_page(sg_page(sg));
2002 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2005 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2006 * emulation, and free + reset pointers if necessary..
2008 if (!cmd->t_data_sg_orig)
2011 kfree(cmd->t_data_sg);
2012 cmd->t_data_sg = cmd->t_data_sg_orig;
2013 cmd->t_data_sg_orig = NULL;
2014 cmd->t_data_nents = cmd->t_data_nents_orig;
2015 cmd->t_data_nents_orig = 0;
2018 static inline void transport_free_pages(struct se_cmd *cmd)
2020 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2021 transport_reset_sgl_orig(cmd);
2024 transport_reset_sgl_orig(cmd);
2026 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2027 cmd->t_data_sg = NULL;
2028 cmd->t_data_nents = 0;
2030 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2031 cmd->t_bidi_data_sg = NULL;
2032 cmd->t_bidi_data_nents = 0;
2036 * transport_release_cmd - free a command
2037 * @cmd: command to free
2039 * This routine unconditionally frees a command, and reference counting
2040 * or list removal must be done in the caller.
2042 static int transport_release_cmd(struct se_cmd *cmd)
2044 BUG_ON(!cmd->se_tfo);
2046 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2047 core_tmr_release_req(cmd->se_tmr_req);
2048 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2049 kfree(cmd->t_task_cdb);
2051 * If this cmd has been setup with target_get_sess_cmd(), drop
2052 * the kref and call ->release_cmd() in kref callback.
2054 return target_put_sess_cmd(cmd->se_sess, cmd);
2058 * transport_put_cmd - release a reference to a command
2059 * @cmd: command to release
2061 * This routine releases our reference to the command and frees it if possible.
2063 static int transport_put_cmd(struct se_cmd *cmd)
2065 transport_free_pages(cmd);
2066 return transport_release_cmd(cmd);
2069 void *transport_kmap_data_sg(struct se_cmd *cmd)
2071 struct scatterlist *sg = cmd->t_data_sg;
2072 struct page **pages;
2076 * We need to take into account a possible offset here for fabrics like
2077 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2078 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2080 if (!cmd->t_data_nents)
2084 if (cmd->t_data_nents == 1)
2085 return kmap(sg_page(sg)) + sg->offset;
2087 /* >1 page. use vmap */
2088 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2092 /* convert sg[] to pages[] */
2093 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2094 pages[i] = sg_page(sg);
2097 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2099 if (!cmd->t_data_vmap)
2102 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2104 EXPORT_SYMBOL(transport_kmap_data_sg);
2106 void transport_kunmap_data_sg(struct se_cmd *cmd)
2108 if (!cmd->t_data_nents) {
2110 } else if (cmd->t_data_nents == 1) {
2111 kunmap(sg_page(cmd->t_data_sg));
2115 vunmap(cmd->t_data_vmap);
2116 cmd->t_data_vmap = NULL;
2118 EXPORT_SYMBOL(transport_kunmap_data_sg);
2121 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2124 struct scatterlist *sg;
2126 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2130 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2131 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2135 sg_init_table(sg, nent);
2138 u32 page_len = min_t(u32, length, PAGE_SIZE);
2139 page = alloc_page(GFP_KERNEL | zero_flag);
2143 sg_set_page(&sg[i], page, page_len, 0);
2154 __free_page(sg_page(&sg[i]));
2161 * Allocate any required resources to execute the command. For writes we
2162 * might not have the payload yet, so notify the fabric via a call to
2163 * ->write_pending instead. Otherwise place it on the execution queue.
2166 transport_generic_new_cmd(struct se_cmd *cmd)
2171 * Determine is the TCM fabric module has already allocated physical
2172 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2175 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2177 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2179 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2180 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2183 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2184 bidi_length = cmd->t_task_nolb *
2185 cmd->se_dev->dev_attrib.block_size;
2187 bidi_length = cmd->data_length;
2189 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2190 &cmd->t_bidi_data_nents,
2191 bidi_length, zero_flag);
2193 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2196 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2197 cmd->data_length, zero_flag);
2199 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2202 * If this command is not a write we can execute it right here,
2203 * for write buffers we need to notify the fabric driver first
2204 * and let it call back once the write buffers are ready.
2206 target_add_to_state_list(cmd);
2207 if (cmd->data_direction != DMA_TO_DEVICE) {
2208 target_execute_cmd(cmd);
2211 transport_cmd_check_stop(cmd, false, true);
2213 ret = cmd->se_tfo->write_pending(cmd);
2214 if (ret == -EAGAIN || ret == -ENOMEM)
2217 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2220 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2223 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2224 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2225 transport_handle_queue_full(cmd, cmd->se_dev);
2228 EXPORT_SYMBOL(transport_generic_new_cmd);
2230 static void transport_write_pending_qf(struct se_cmd *cmd)
2234 ret = cmd->se_tfo->write_pending(cmd);
2235 if (ret == -EAGAIN || ret == -ENOMEM) {
2236 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2238 transport_handle_queue_full(cmd, cmd->se_dev);
2242 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2244 unsigned long flags;
2247 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2248 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2249 transport_wait_for_tasks(cmd);
2251 ret = transport_release_cmd(cmd);
2254 transport_wait_for_tasks(cmd);
2256 * Handle WRITE failure case where transport_generic_new_cmd()
2257 * has already added se_cmd to state_list, but fabric has
2258 * failed command before I/O submission.
2260 if (cmd->state_active) {
2261 spin_lock_irqsave(&cmd->t_state_lock, flags);
2262 target_remove_from_state_list(cmd);
2263 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2267 transport_lun_remove_cmd(cmd);
2269 ret = transport_put_cmd(cmd);
2273 EXPORT_SYMBOL(transport_generic_free_cmd);
2275 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2276 * @se_sess: session to reference
2277 * @se_cmd: command descriptor to add
2278 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2280 int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2283 unsigned long flags;
2286 kref_init(&se_cmd->cmd_kref);
2288 * Add a second kref if the fabric caller is expecting to handle
2289 * fabric acknowledgement that requires two target_put_sess_cmd()
2290 * invocations before se_cmd descriptor release.
2292 if (ack_kref == true) {
2293 kref_get(&se_cmd->cmd_kref);
2294 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2297 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2298 if (se_sess->sess_tearing_down) {
2302 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2304 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2307 EXPORT_SYMBOL(target_get_sess_cmd);
2309 static void target_release_cmd_kref(struct kref *kref)
2311 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2312 struct se_session *se_sess = se_cmd->se_sess;
2314 if (list_empty(&se_cmd->se_cmd_list)) {
2315 spin_unlock(&se_sess->sess_cmd_lock);
2316 se_cmd->se_tfo->release_cmd(se_cmd);
2319 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2320 spin_unlock(&se_sess->sess_cmd_lock);
2321 complete(&se_cmd->cmd_wait_comp);
2324 list_del(&se_cmd->se_cmd_list);
2325 spin_unlock(&se_sess->sess_cmd_lock);
2327 se_cmd->se_tfo->release_cmd(se_cmd);
2330 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2331 * @se_sess: session to reference
2332 * @se_cmd: command descriptor to drop
2334 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2336 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2337 &se_sess->sess_cmd_lock);
2339 EXPORT_SYMBOL(target_put_sess_cmd);
2341 /* target_sess_cmd_list_set_waiting - Flag all commands in
2342 * sess_cmd_list to complete cmd_wait_comp. Set
2343 * sess_tearing_down so no more commands are queued.
2344 * @se_sess: session to flag
2346 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2348 struct se_cmd *se_cmd;
2349 unsigned long flags;
2351 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2352 if (se_sess->sess_tearing_down) {
2353 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2356 se_sess->sess_tearing_down = 1;
2357 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2359 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2360 se_cmd->cmd_wait_set = 1;
2362 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2364 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2366 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2367 * @se_sess: session to wait for active I/O
2369 void target_wait_for_sess_cmds(struct se_session *se_sess)
2371 struct se_cmd *se_cmd, *tmp_cmd;
2372 unsigned long flags;
2374 list_for_each_entry_safe(se_cmd, tmp_cmd,
2375 &se_sess->sess_wait_list, se_cmd_list) {
2376 list_del(&se_cmd->se_cmd_list);
2378 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2379 " %d\n", se_cmd, se_cmd->t_state,
2380 se_cmd->se_tfo->get_cmd_state(se_cmd));
2382 wait_for_completion(&se_cmd->cmd_wait_comp);
2383 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2384 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2385 se_cmd->se_tfo->get_cmd_state(se_cmd));
2387 se_cmd->se_tfo->release_cmd(se_cmd);
2390 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2391 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2392 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2395 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2397 /* transport_lun_wait_for_tasks():
2399 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2400 * an struct se_lun to be successfully shutdown.
2402 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2404 unsigned long flags;
2408 * If the frontend has already requested this struct se_cmd to
2409 * be stopped, we can safely ignore this struct se_cmd.
2411 spin_lock_irqsave(&cmd->t_state_lock, flags);
2412 if (cmd->transport_state & CMD_T_STOP) {
2413 cmd->transport_state &= ~CMD_T_LUN_STOP;
2415 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2416 cmd->se_tfo->get_task_tag(cmd));
2417 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2418 transport_cmd_check_stop(cmd, false, false);
2421 cmd->transport_state |= CMD_T_LUN_FE_STOP;
2422 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2424 // XXX: audit task_flags checks.
2425 spin_lock_irqsave(&cmd->t_state_lock, flags);
2426 if ((cmd->transport_state & CMD_T_BUSY) &&
2427 (cmd->transport_state & CMD_T_SENT)) {
2428 if (!target_stop_cmd(cmd, &flags))
2431 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2433 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2436 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2437 cmd->se_tfo->get_task_tag(cmd));
2438 wait_for_completion(&cmd->transport_lun_stop_comp);
2439 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2440 cmd->se_tfo->get_task_tag(cmd));
2446 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2448 struct se_cmd *cmd = NULL;
2449 unsigned long lun_flags, cmd_flags;
2451 * Do exception processing and return CHECK_CONDITION status to the
2454 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2455 while (!list_empty(&lun->lun_cmd_list)) {
2456 cmd = list_first_entry(&lun->lun_cmd_list,
2457 struct se_cmd, se_lun_node);
2458 list_del_init(&cmd->se_lun_node);
2460 spin_lock(&cmd->t_state_lock);
2461 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2462 "_lun_stop for ITT: 0x%08x\n",
2463 cmd->se_lun->unpacked_lun,
2464 cmd->se_tfo->get_task_tag(cmd));
2465 cmd->transport_state |= CMD_T_LUN_STOP;
2466 spin_unlock(&cmd->t_state_lock);
2468 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2471 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2472 cmd->se_tfo->get_task_tag(cmd),
2473 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2477 * If the Storage engine still owns the iscsi_cmd_t, determine
2478 * and/or stop its context.
2480 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2481 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2482 cmd->se_tfo->get_task_tag(cmd));
2484 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2485 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2489 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2490 "_wait_for_tasks(): SUCCESS\n",
2491 cmd->se_lun->unpacked_lun,
2492 cmd->se_tfo->get_task_tag(cmd));
2494 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2495 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2496 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2499 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2500 target_remove_from_state_list(cmd);
2501 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2504 * The Storage engine stopped this struct se_cmd before it was
2505 * send to the fabric frontend for delivery back to the
2506 * Initiator Node. Return this SCSI CDB back with an
2507 * CHECK_CONDITION status.
2510 transport_send_check_condition_and_sense(cmd,
2511 TCM_NON_EXISTENT_LUN, 0);
2513 * If the fabric frontend is waiting for this iscsi_cmd_t to
2514 * be released, notify the waiting thread now that LU has
2515 * finished accessing it.
2517 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2518 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2519 pr_debug("SE_LUN[%d] - Detected FE stop for"
2520 " struct se_cmd: %p ITT: 0x%08x\n",
2522 cmd, cmd->se_tfo->get_task_tag(cmd));
2524 spin_unlock_irqrestore(&cmd->t_state_lock,
2526 transport_cmd_check_stop(cmd, false, false);
2527 complete(&cmd->transport_lun_fe_stop_comp);
2528 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2531 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2532 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2534 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2535 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2537 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2540 static int transport_clear_lun_thread(void *p)
2542 struct se_lun *lun = p;
2544 __transport_clear_lun_from_sessions(lun);
2545 complete(&lun->lun_shutdown_comp);
2550 int transport_clear_lun_from_sessions(struct se_lun *lun)
2552 struct task_struct *kt;
2554 kt = kthread_run(transport_clear_lun_thread, lun,
2555 "tcm_cl_%u", lun->unpacked_lun);
2557 pr_err("Unable to start clear_lun thread\n");
2560 wait_for_completion(&lun->lun_shutdown_comp);
2566 * transport_wait_for_tasks - wait for completion to occur
2567 * @cmd: command to wait
2569 * Called from frontend fabric context to wait for storage engine
2570 * to pause and/or release frontend generated struct se_cmd.
2572 bool transport_wait_for_tasks(struct se_cmd *cmd)
2574 unsigned long flags;
2576 spin_lock_irqsave(&cmd->t_state_lock, flags);
2577 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2578 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2579 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2583 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2584 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2589 * If we are already stopped due to an external event (ie: LUN shutdown)
2590 * sleep until the connection can have the passed struct se_cmd back.
2591 * The cmd->transport_lun_stopped_sem will be upped by
2592 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2593 * has completed its operation on the struct se_cmd.
2595 if (cmd->transport_state & CMD_T_LUN_STOP) {
2596 pr_debug("wait_for_tasks: Stopping"
2597 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2598 "_stop_comp); for ITT: 0x%08x\n",
2599 cmd->se_tfo->get_task_tag(cmd));
2601 * There is a special case for WRITES where a FE exception +
2602 * LUN shutdown means ConfigFS context is still sleeping on
2603 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2604 * We go ahead and up transport_lun_stop_comp just to be sure
2607 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2608 complete(&cmd->transport_lun_stop_comp);
2609 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2610 spin_lock_irqsave(&cmd->t_state_lock, flags);
2612 target_remove_from_state_list(cmd);
2614 * At this point, the frontend who was the originator of this
2615 * struct se_cmd, now owns the structure and can be released through
2616 * normal means below.
2618 pr_debug("wait_for_tasks: Stopped"
2619 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2620 "stop_comp); for ITT: 0x%08x\n",
2621 cmd->se_tfo->get_task_tag(cmd));
2623 cmd->transport_state &= ~CMD_T_LUN_STOP;
2626 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2627 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2631 cmd->transport_state |= CMD_T_STOP;
2633 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2634 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2635 cmd, cmd->se_tfo->get_task_tag(cmd),
2636 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2638 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2640 wait_for_completion(&cmd->t_transport_stop_comp);
2642 spin_lock_irqsave(&cmd->t_state_lock, flags);
2643 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2645 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2646 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2647 cmd->se_tfo->get_task_tag(cmd));
2649 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2653 EXPORT_SYMBOL(transport_wait_for_tasks);
2655 static int transport_get_sense_codes(
2660 *asc = cmd->scsi_asc;
2661 *ascq = cmd->scsi_ascq;
2667 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2668 sense_reason_t reason, int from_transport)
2670 unsigned char *buffer = cmd->sense_buffer;
2671 unsigned long flags;
2672 u8 asc = 0, ascq = 0;
2674 spin_lock_irqsave(&cmd->t_state_lock, flags);
2675 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2676 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2679 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2680 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2682 if (!reason && from_transport)
2685 if (!from_transport)
2686 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2689 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2690 * SENSE KEY values from include/scsi/scsi.h
2696 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2698 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2699 /* NO ADDITIONAL SENSE INFORMATION */
2700 buffer[SPC_ASC_KEY_OFFSET] = 0;
2701 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2703 case TCM_NON_EXISTENT_LUN:
2706 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2707 /* ILLEGAL REQUEST */
2708 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2709 /* LOGICAL UNIT NOT SUPPORTED */
2710 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2712 case TCM_UNSUPPORTED_SCSI_OPCODE:
2713 case TCM_SECTOR_COUNT_TOO_MANY:
2716 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2717 /* ILLEGAL REQUEST */
2718 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2719 /* INVALID COMMAND OPERATION CODE */
2720 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2722 case TCM_UNKNOWN_MODE_PAGE:
2725 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2726 /* ILLEGAL REQUEST */
2727 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2728 /* INVALID FIELD IN CDB */
2729 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2731 case TCM_CHECK_CONDITION_ABORT_CMD:
2734 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2735 /* ABORTED COMMAND */
2736 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2737 /* BUS DEVICE RESET FUNCTION OCCURRED */
2738 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2739 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2741 case TCM_INCORRECT_AMOUNT_OF_DATA:
2744 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2745 /* ABORTED COMMAND */
2746 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2748 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2749 /* NOT ENOUGH UNSOLICITED DATA */
2750 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2752 case TCM_INVALID_CDB_FIELD:
2755 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2756 /* ILLEGAL REQUEST */
2757 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2758 /* INVALID FIELD IN CDB */
2759 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2761 case TCM_INVALID_PARAMETER_LIST:
2764 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2765 /* ILLEGAL REQUEST */
2766 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2767 /* INVALID FIELD IN PARAMETER LIST */
2768 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2770 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2773 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2774 /* ILLEGAL REQUEST */
2775 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2776 /* PARAMETER LIST LENGTH ERROR */
2777 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2779 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2782 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2783 /* ABORTED COMMAND */
2784 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2786 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2787 /* UNEXPECTED_UNSOLICITED_DATA */
2788 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2790 case TCM_SERVICE_CRC_ERROR:
2793 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2794 /* ABORTED COMMAND */
2795 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2796 /* PROTOCOL SERVICE CRC ERROR */
2797 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2799 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2801 case TCM_SNACK_REJECTED:
2804 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2805 /* ABORTED COMMAND */
2806 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2808 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2809 /* FAILED RETRANSMISSION REQUEST */
2810 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2812 case TCM_WRITE_PROTECTED:
2815 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2817 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2818 /* WRITE PROTECTED */
2819 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2821 case TCM_ADDRESS_OUT_OF_RANGE:
2824 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2825 /* ILLEGAL REQUEST */
2826 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2827 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2828 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2830 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2833 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2834 /* UNIT ATTENTION */
2835 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2836 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2837 buffer[SPC_ASC_KEY_OFFSET] = asc;
2838 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2840 case TCM_CHECK_CONDITION_NOT_READY:
2843 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2845 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2846 transport_get_sense_codes(cmd, &asc, &ascq);
2847 buffer[SPC_ASC_KEY_OFFSET] = asc;
2848 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2850 case TCM_MISCOMPARE_VERIFY:
2853 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2854 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2855 /* MISCOMPARE DURING VERIFY OPERATION */
2856 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2857 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2859 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2863 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2865 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2866 * Solaris initiators. Returning NOT READY instead means the
2867 * operations will be retried a finite number of times and we
2868 * can survive intermittent errors.
2870 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2871 /* LOGICAL UNIT COMMUNICATION FAILURE */
2872 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2876 * This code uses linux/include/scsi/scsi.h SAM status codes!
2878 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2880 * Automatically padded, this value is encoded in the fabric's
2881 * data_length response PDU containing the SCSI defined sense data.
2883 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2886 trace_target_cmd_complete(cmd);
2887 return cmd->se_tfo->queue_status(cmd);
2889 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2891 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2893 if (!(cmd->transport_state & CMD_T_ABORTED))
2896 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2899 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2900 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
2902 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2903 trace_target_cmd_complete(cmd);
2904 cmd->se_tfo->queue_status(cmd);
2908 EXPORT_SYMBOL(transport_check_aborted_status);
2910 void transport_send_task_abort(struct se_cmd *cmd)
2912 unsigned long flags;
2914 spin_lock_irqsave(&cmd->t_state_lock, flags);
2915 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
2916 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2919 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2922 * If there are still expected incoming fabric WRITEs, we wait
2923 * until until they have completed before sending a TASK_ABORTED
2924 * response. This response with TASK_ABORTED status will be
2925 * queued back to fabric module by transport_check_aborted_status().
2927 if (cmd->data_direction == DMA_TO_DEVICE) {
2928 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2929 cmd->transport_state |= CMD_T_ABORTED;
2930 smp_mb__after_atomic_inc();
2933 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2935 transport_lun_remove_cmd(cmd);
2937 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2938 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
2939 cmd->se_tfo->get_task_tag(cmd));
2941 trace_target_cmd_complete(cmd);
2942 cmd->se_tfo->queue_status(cmd);
2945 static void target_tmr_work(struct work_struct *work)
2947 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2948 struct se_device *dev = cmd->se_dev;
2949 struct se_tmr_req *tmr = cmd->se_tmr_req;
2952 switch (tmr->function) {
2953 case TMR_ABORT_TASK:
2954 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2956 case TMR_ABORT_TASK_SET:
2958 case TMR_CLEAR_TASK_SET:
2959 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2962 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2963 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2964 TMR_FUNCTION_REJECTED;
2966 case TMR_TARGET_WARM_RESET:
2967 tmr->response = TMR_FUNCTION_REJECTED;
2969 case TMR_TARGET_COLD_RESET:
2970 tmr->response = TMR_FUNCTION_REJECTED;
2973 pr_err("Uknown TMR function: 0x%02x.\n",
2975 tmr->response = TMR_FUNCTION_REJECTED;
2979 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
2980 cmd->se_tfo->queue_tm_rsp(cmd);
2982 transport_cmd_check_stop_to_fabric(cmd);
2985 int transport_generic_handle_tmr(
2988 INIT_WORK(&cmd->work, target_tmr_work);
2989 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
2992 EXPORT_SYMBOL(transport_generic_handle_tmr);