1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * (c) Copyright 2002-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/net.h>
27 #include <linux/delay.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/slab.h>
31 #include <linux/spinlock.h>
32 #include <linux/kthread.h>
34 #include <linux/cdrom.h>
35 #include <linux/module.h>
36 #include <linux/ratelimit.h>
37 #include <linux/vmalloc.h>
38 #include <asm/unaligned.h>
41 #include <scsi/scsi_proto.h>
42 #include <scsi/scsi_common.h>
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
48 #include "target_core_internal.h"
49 #include "target_core_alua.h"
50 #include "target_core_pr.h"
51 #include "target_core_ua.h"
53 #define CREATE_TRACE_POINTS
54 #include <trace/events/target.h>
56 static struct workqueue_struct *target_completion_wq;
57 static struct kmem_cache *se_sess_cache;
58 struct kmem_cache *se_ua_cache;
59 struct kmem_cache *t10_pr_reg_cache;
60 struct kmem_cache *t10_alua_lu_gp_cache;
61 struct kmem_cache *t10_alua_lu_gp_mem_cache;
62 struct kmem_cache *t10_alua_tg_pt_gp_cache;
63 struct kmem_cache *t10_alua_lba_map_cache;
64 struct kmem_cache *t10_alua_lba_map_mem_cache;
66 static void transport_complete_task_attr(struct se_cmd *cmd);
67 static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason);
68 static void transport_handle_queue_full(struct se_cmd *cmd,
69 struct se_device *dev, int err, bool write_pending);
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_lba_map_cache = kmem_cache_create(
123 "t10_alua_lba_map_cache",
124 sizeof(struct t10_alua_lba_map),
125 __alignof__(struct t10_alua_lba_map), 0, NULL);
126 if (!t10_alua_lba_map_cache) {
127 pr_err("kmem_cache_create() for t10_alua_lba_map_"
129 goto out_free_tg_pt_gp_cache;
131 t10_alua_lba_map_mem_cache = kmem_cache_create(
132 "t10_alua_lba_map_mem_cache",
133 sizeof(struct t10_alua_lba_map_member),
134 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
135 if (!t10_alua_lba_map_mem_cache) {
136 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
138 goto out_free_lba_map_cache;
141 target_completion_wq = alloc_workqueue("target_completion",
143 if (!target_completion_wq)
144 goto out_free_lba_map_mem_cache;
148 out_free_lba_map_mem_cache:
149 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
150 out_free_lba_map_cache:
151 kmem_cache_destroy(t10_alua_lba_map_cache);
152 out_free_tg_pt_gp_cache:
153 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
154 out_free_lu_gp_mem_cache:
155 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
156 out_free_lu_gp_cache:
157 kmem_cache_destroy(t10_alua_lu_gp_cache);
158 out_free_pr_reg_cache:
159 kmem_cache_destroy(t10_pr_reg_cache);
161 kmem_cache_destroy(se_ua_cache);
163 kmem_cache_destroy(se_sess_cache);
168 void release_se_kmem_caches(void)
170 destroy_workqueue(target_completion_wq);
171 kmem_cache_destroy(se_sess_cache);
172 kmem_cache_destroy(se_ua_cache);
173 kmem_cache_destroy(t10_pr_reg_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_cache);
175 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
176 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
177 kmem_cache_destroy(t10_alua_lba_map_cache);
178 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
181 /* This code ensures unique mib indexes are handed out. */
182 static DEFINE_SPINLOCK(scsi_mib_index_lock);
183 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
186 * Allocate a new row index for the entry type specified
188 u32 scsi_get_new_index(scsi_index_t type)
192 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
194 spin_lock(&scsi_mib_index_lock);
195 new_index = ++scsi_mib_index[type];
196 spin_unlock(&scsi_mib_index_lock);
201 void transport_subsystem_check_init(void)
204 static int sub_api_initialized;
206 if (sub_api_initialized)
209 ret = request_module("target_core_iblock");
211 pr_err("Unable to load target_core_iblock\n");
213 ret = request_module("target_core_file");
215 pr_err("Unable to load target_core_file\n");
217 ret = request_module("target_core_pscsi");
219 pr_err("Unable to load target_core_pscsi\n");
221 ret = request_module("target_core_user");
223 pr_err("Unable to load target_core_user\n");
225 sub_api_initialized = 1;
228 struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
230 struct se_session *se_sess;
232 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
234 pr_err("Unable to allocate struct se_session from"
236 return ERR_PTR(-ENOMEM);
238 INIT_LIST_HEAD(&se_sess->sess_list);
239 INIT_LIST_HEAD(&se_sess->sess_acl_list);
240 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
241 INIT_LIST_HEAD(&se_sess->sess_wait_list);
242 spin_lock_init(&se_sess->sess_cmd_lock);
243 se_sess->sup_prot_ops = sup_prot_ops;
247 EXPORT_SYMBOL(transport_init_session);
249 int transport_alloc_session_tags(struct se_session *se_sess,
250 unsigned int tag_num, unsigned int tag_size)
254 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
255 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
256 if (!se_sess->sess_cmd_map) {
257 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
258 if (!se_sess->sess_cmd_map) {
259 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
264 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
266 pr_err("Unable to init se_sess->sess_tag_pool,"
267 " tag_num: %u\n", tag_num);
268 kvfree(se_sess->sess_cmd_map);
269 se_sess->sess_cmd_map = NULL;
275 EXPORT_SYMBOL(transport_alloc_session_tags);
277 struct se_session *transport_init_session_tags(unsigned int tag_num,
278 unsigned int tag_size,
279 enum target_prot_op sup_prot_ops)
281 struct se_session *se_sess;
284 if (tag_num != 0 && !tag_size) {
285 pr_err("init_session_tags called with percpu-ida tag_num:"
286 " %u, but zero tag_size\n", tag_num);
287 return ERR_PTR(-EINVAL);
289 if (!tag_num && tag_size) {
290 pr_err("init_session_tags called with percpu-ida tag_size:"
291 " %u, but zero tag_num\n", tag_size);
292 return ERR_PTR(-EINVAL);
295 se_sess = transport_init_session(sup_prot_ops);
299 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
301 transport_free_session(se_sess);
302 return ERR_PTR(-ENOMEM);
307 EXPORT_SYMBOL(transport_init_session_tags);
310 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
312 void __transport_register_session(
313 struct se_portal_group *se_tpg,
314 struct se_node_acl *se_nacl,
315 struct se_session *se_sess,
316 void *fabric_sess_ptr)
318 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
319 unsigned char buf[PR_REG_ISID_LEN];
321 se_sess->se_tpg = se_tpg;
322 se_sess->fabric_sess_ptr = fabric_sess_ptr;
324 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
326 * Only set for struct se_session's that will actually be moving I/O.
327 * eg: *NOT* discovery sessions.
332 * Determine if fabric allows for T10-PI feature bits exposed to
333 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
335 * If so, then always save prot_type on a per se_node_acl node
336 * basis and re-instate the previous sess_prot_type to avoid
337 * disabling PI from below any previously initiator side
340 if (se_nacl->saved_prot_type)
341 se_sess->sess_prot_type = se_nacl->saved_prot_type;
342 else if (tfo->tpg_check_prot_fabric_only)
343 se_sess->sess_prot_type = se_nacl->saved_prot_type =
344 tfo->tpg_check_prot_fabric_only(se_tpg);
346 * If the fabric module supports an ISID based TransportID,
347 * save this value in binary from the fabric I_T Nexus now.
349 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
350 memset(&buf[0], 0, PR_REG_ISID_LEN);
351 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
352 &buf[0], PR_REG_ISID_LEN);
353 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
356 spin_lock_irq(&se_nacl->nacl_sess_lock);
358 * The se_nacl->nacl_sess pointer will be set to the
359 * last active I_T Nexus for each struct se_node_acl.
361 se_nacl->nacl_sess = se_sess;
363 list_add_tail(&se_sess->sess_acl_list,
364 &se_nacl->acl_sess_list);
365 spin_unlock_irq(&se_nacl->nacl_sess_lock);
367 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
369 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
370 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
372 EXPORT_SYMBOL(__transport_register_session);
374 void transport_register_session(
375 struct se_portal_group *se_tpg,
376 struct se_node_acl *se_nacl,
377 struct se_session *se_sess,
378 void *fabric_sess_ptr)
382 spin_lock_irqsave(&se_tpg->session_lock, flags);
383 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
384 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
386 EXPORT_SYMBOL(transport_register_session);
389 target_alloc_session(struct se_portal_group *tpg,
390 unsigned int tag_num, unsigned int tag_size,
391 enum target_prot_op prot_op,
392 const char *initiatorname, void *private,
393 int (*callback)(struct se_portal_group *,
394 struct se_session *, void *))
396 struct se_session *sess;
399 * If the fabric driver is using percpu-ida based pre allocation
400 * of I/O descriptor tags, go ahead and perform that setup now..
403 sess = transport_init_session_tags(tag_num, tag_size, prot_op);
405 sess = transport_init_session(prot_op);
410 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
411 (unsigned char *)initiatorname);
412 if (!sess->se_node_acl) {
413 transport_free_session(sess);
414 return ERR_PTR(-EACCES);
417 * Go ahead and perform any remaining fabric setup that is
418 * required before transport_register_session().
420 if (callback != NULL) {
421 int rc = callback(tpg, sess, private);
423 transport_free_session(sess);
428 transport_register_session(tpg, sess->se_node_acl, sess, private);
431 EXPORT_SYMBOL(target_alloc_session);
433 ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
435 struct se_session *se_sess;
438 spin_lock_bh(&se_tpg->session_lock);
439 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
440 if (!se_sess->se_node_acl)
442 if (!se_sess->se_node_acl->dynamic_node_acl)
444 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
447 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
448 se_sess->se_node_acl->initiatorname);
449 len += 1; /* Include NULL terminator */
451 spin_unlock_bh(&se_tpg->session_lock);
455 EXPORT_SYMBOL(target_show_dynamic_sessions);
457 static void target_complete_nacl(struct kref *kref)
459 struct se_node_acl *nacl = container_of(kref,
460 struct se_node_acl, acl_kref);
461 struct se_portal_group *se_tpg = nacl->se_tpg;
463 if (!nacl->dynamic_stop) {
464 complete(&nacl->acl_free_comp);
468 mutex_lock(&se_tpg->acl_node_mutex);
469 list_del(&nacl->acl_list);
470 mutex_unlock(&se_tpg->acl_node_mutex);
472 core_tpg_wait_for_nacl_pr_ref(nacl);
473 core_free_device_list_for_node(nacl, se_tpg);
477 void target_put_nacl(struct se_node_acl *nacl)
479 kref_put(&nacl->acl_kref, target_complete_nacl);
481 EXPORT_SYMBOL(target_put_nacl);
483 void transport_deregister_session_configfs(struct se_session *se_sess)
485 struct se_node_acl *se_nacl;
488 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
490 se_nacl = se_sess->se_node_acl;
492 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
493 if (!list_empty(&se_sess->sess_acl_list))
494 list_del_init(&se_sess->sess_acl_list);
496 * If the session list is empty, then clear the pointer.
497 * Otherwise, set the struct se_session pointer from the tail
498 * element of the per struct se_node_acl active session list.
500 if (list_empty(&se_nacl->acl_sess_list))
501 se_nacl->nacl_sess = NULL;
503 se_nacl->nacl_sess = container_of(
504 se_nacl->acl_sess_list.prev,
505 struct se_session, sess_acl_list);
507 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
510 EXPORT_SYMBOL(transport_deregister_session_configfs);
512 void transport_free_session(struct se_session *se_sess)
514 struct se_node_acl *se_nacl = se_sess->se_node_acl;
517 * Drop the se_node_acl->nacl_kref obtained from within
518 * core_tpg_get_initiator_node_acl().
521 struct se_portal_group *se_tpg = se_nacl->se_tpg;
522 const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo;
525 se_sess->se_node_acl = NULL;
528 * Also determine if we need to drop the extra ->cmd_kref if
529 * it had been previously dynamically generated, and
530 * the endpoint is not caching dynamic ACLs.
532 mutex_lock(&se_tpg->acl_node_mutex);
533 if (se_nacl->dynamic_node_acl &&
534 !se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
535 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
536 if (list_empty(&se_nacl->acl_sess_list))
537 se_nacl->dynamic_stop = true;
538 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
540 if (se_nacl->dynamic_stop)
541 list_del(&se_nacl->acl_list);
543 mutex_unlock(&se_tpg->acl_node_mutex);
545 if (se_nacl->dynamic_stop)
546 target_put_nacl(se_nacl);
548 target_put_nacl(se_nacl);
550 if (se_sess->sess_cmd_map) {
551 percpu_ida_destroy(&se_sess->sess_tag_pool);
552 kvfree(se_sess->sess_cmd_map);
554 kmem_cache_free(se_sess_cache, se_sess);
556 EXPORT_SYMBOL(transport_free_session);
558 void transport_deregister_session(struct se_session *se_sess)
560 struct se_portal_group *se_tpg = se_sess->se_tpg;
564 transport_free_session(se_sess);
568 spin_lock_irqsave(&se_tpg->session_lock, flags);
569 list_del(&se_sess->sess_list);
570 se_sess->se_tpg = NULL;
571 se_sess->fabric_sess_ptr = NULL;
572 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
574 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
575 se_tpg->se_tpg_tfo->get_fabric_name());
577 * If last kref is dropping now for an explicit NodeACL, awake sleeping
578 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
579 * removal context from within transport_free_session() code.
581 * For dynamic ACL, target_put_nacl() uses target_complete_nacl()
582 * to release all remaining generate_node_acl=1 created ACL resources.
585 transport_free_session(se_sess);
587 EXPORT_SYMBOL(transport_deregister_session);
589 static void target_remove_from_state_list(struct se_cmd *cmd)
591 struct se_device *dev = cmd->se_dev;
597 spin_lock_irqsave(&dev->execute_task_lock, flags);
598 if (cmd->state_active) {
599 list_del(&cmd->state_list);
600 cmd->state_active = false;
602 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
605 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
609 target_remove_from_state_list(cmd);
612 * Clear struct se_cmd->se_lun before the handoff to FE.
616 spin_lock_irqsave(&cmd->t_state_lock, flags);
618 * Determine if frontend context caller is requesting the stopping of
619 * this command for frontend exceptions.
621 if (cmd->transport_state & CMD_T_STOP) {
622 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
623 __func__, __LINE__, cmd->tag);
625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
627 complete_all(&cmd->t_transport_stop_comp);
630 cmd->transport_state &= ~CMD_T_ACTIVE;
631 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
634 * Some fabric modules like tcm_loop can release their internally
635 * allocated I/O reference and struct se_cmd now.
637 * Fabric modules are expected to return '1' here if the se_cmd being
638 * passed is released at this point, or zero if not being released.
640 return cmd->se_tfo->check_stop_free(cmd);
643 static void transport_lun_remove_cmd(struct se_cmd *cmd)
645 struct se_lun *lun = cmd->se_lun;
650 if (cmpxchg(&cmd->lun_ref_active, true, false))
651 percpu_ref_put(&lun->lun_ref);
654 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
656 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
658 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
659 transport_lun_remove_cmd(cmd);
661 * Allow the fabric driver to unmap any resources before
662 * releasing the descriptor via TFO->release_cmd()
665 cmd->se_tfo->aborted_task(cmd);
667 if (transport_cmd_check_stop_to_fabric(cmd))
669 if (remove && ack_kref)
670 transport_put_cmd(cmd);
673 static void target_complete_failure_work(struct work_struct *work)
675 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
677 transport_generic_request_failure(cmd,
678 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
682 * Used when asking transport to copy Sense Data from the underlying
683 * Linux/SCSI struct scsi_cmnd
685 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
687 struct se_device *dev = cmd->se_dev;
689 WARN_ON(!cmd->se_lun);
694 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
697 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
699 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
700 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
701 return cmd->sense_buffer;
704 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
706 struct se_device *dev = cmd->se_dev;
707 int success = scsi_status == GOOD;
710 cmd->scsi_status = scsi_status;
713 spin_lock_irqsave(&cmd->t_state_lock, flags);
715 if (dev && dev->transport->transport_complete) {
716 dev->transport->transport_complete(cmd,
718 transport_get_sense_buffer(cmd));
719 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
724 * Check for case where an explicit ABORT_TASK has been received
725 * and transport_wait_for_tasks() will be waiting for completion..
727 if (cmd->transport_state & CMD_T_ABORTED ||
728 cmd->transport_state & CMD_T_STOP) {
729 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
730 complete_all(&cmd->t_transport_stop_comp);
732 } else if (!success) {
733 INIT_WORK(&cmd->work, target_complete_failure_work);
735 INIT_WORK(&cmd->work, target_complete_ok_work);
738 cmd->t_state = TRANSPORT_COMPLETE;
739 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
740 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
742 if (cmd->se_cmd_flags & SCF_USE_CPUID)
743 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
745 queue_work(target_completion_wq, &cmd->work);
747 EXPORT_SYMBOL(target_complete_cmd);
749 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
751 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
752 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
753 cmd->residual_count += cmd->data_length - length;
755 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
756 cmd->residual_count = cmd->data_length - length;
759 cmd->data_length = length;
762 target_complete_cmd(cmd, scsi_status);
764 EXPORT_SYMBOL(target_complete_cmd_with_length);
766 static void target_add_to_state_list(struct se_cmd *cmd)
768 struct se_device *dev = cmd->se_dev;
771 spin_lock_irqsave(&dev->execute_task_lock, flags);
772 if (!cmd->state_active) {
773 list_add_tail(&cmd->state_list, &dev->state_list);
774 cmd->state_active = true;
776 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
780 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
782 static void transport_write_pending_qf(struct se_cmd *cmd);
783 static void transport_complete_qf(struct se_cmd *cmd);
785 void target_qf_do_work(struct work_struct *work)
787 struct se_device *dev = container_of(work, struct se_device,
789 LIST_HEAD(qf_cmd_list);
790 struct se_cmd *cmd, *cmd_tmp;
792 spin_lock_irq(&dev->qf_cmd_lock);
793 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
794 spin_unlock_irq(&dev->qf_cmd_lock);
796 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
797 list_del(&cmd->se_qf_node);
798 atomic_dec_mb(&dev->dev_qf_count);
800 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
801 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
802 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
803 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
806 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
807 transport_write_pending_qf(cmd);
808 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK ||
809 cmd->t_state == TRANSPORT_COMPLETE_QF_ERR)
810 transport_complete_qf(cmd);
814 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
816 switch (cmd->data_direction) {
819 case DMA_FROM_DEVICE:
823 case DMA_BIDIRECTIONAL:
832 void transport_dump_dev_state(
833 struct se_device *dev,
837 *bl += sprintf(b + *bl, "Status: ");
838 if (dev->export_count)
839 *bl += sprintf(b + *bl, "ACTIVATED");
841 *bl += sprintf(b + *bl, "DEACTIVATED");
843 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
844 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
845 dev->dev_attrib.block_size,
846 dev->dev_attrib.hw_max_sectors);
847 *bl += sprintf(b + *bl, " ");
850 void transport_dump_vpd_proto_id(
852 unsigned char *p_buf,
855 unsigned char buf[VPD_TMP_BUF_SIZE];
858 memset(buf, 0, VPD_TMP_BUF_SIZE);
859 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
861 switch (vpd->protocol_identifier) {
863 sprintf(buf+len, "Fibre Channel\n");
866 sprintf(buf+len, "Parallel SCSI\n");
869 sprintf(buf+len, "SSA\n");
872 sprintf(buf+len, "IEEE 1394\n");
875 sprintf(buf+len, "SCSI Remote Direct Memory Access"
879 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
882 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
885 sprintf(buf+len, "Automation/Drive Interface Transport"
889 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
892 sprintf(buf+len, "Unknown 0x%02x\n",
893 vpd->protocol_identifier);
898 strncpy(p_buf, buf, p_buf_len);
904 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
907 * Check if the Protocol Identifier Valid (PIV) bit is set..
909 * from spc3r23.pdf section 7.5.1
911 if (page_83[1] & 0x80) {
912 vpd->protocol_identifier = (page_83[0] & 0xf0);
913 vpd->protocol_identifier_set = 1;
914 transport_dump_vpd_proto_id(vpd, NULL, 0);
917 EXPORT_SYMBOL(transport_set_vpd_proto_id);
919 int transport_dump_vpd_assoc(
921 unsigned char *p_buf,
924 unsigned char buf[VPD_TMP_BUF_SIZE];
928 memset(buf, 0, VPD_TMP_BUF_SIZE);
929 len = sprintf(buf, "T10 VPD Identifier Association: ");
931 switch (vpd->association) {
933 sprintf(buf+len, "addressed logical unit\n");
936 sprintf(buf+len, "target port\n");
939 sprintf(buf+len, "SCSI target device\n");
942 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
948 strncpy(p_buf, buf, p_buf_len);
955 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
958 * The VPD identification association..
960 * from spc3r23.pdf Section 7.6.3.1 Table 297
962 vpd->association = (page_83[1] & 0x30);
963 return transport_dump_vpd_assoc(vpd, NULL, 0);
965 EXPORT_SYMBOL(transport_set_vpd_assoc);
967 int transport_dump_vpd_ident_type(
969 unsigned char *p_buf,
972 unsigned char buf[VPD_TMP_BUF_SIZE];
976 memset(buf, 0, VPD_TMP_BUF_SIZE);
977 len = sprintf(buf, "T10 VPD Identifier Type: ");
979 switch (vpd->device_identifier_type) {
981 sprintf(buf+len, "Vendor specific\n");
984 sprintf(buf+len, "T10 Vendor ID based\n");
987 sprintf(buf+len, "EUI-64 based\n");
990 sprintf(buf+len, "NAA\n");
993 sprintf(buf+len, "Relative target port identifier\n");
996 sprintf(buf+len, "SCSI name string\n");
999 sprintf(buf+len, "Unsupported: 0x%02x\n",
1000 vpd->device_identifier_type);
1006 if (p_buf_len < strlen(buf)+1)
1008 strncpy(p_buf, buf, p_buf_len);
1010 pr_debug("%s", buf);
1016 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1019 * The VPD identifier type..
1021 * from spc3r23.pdf Section 7.6.3.1 Table 298
1023 vpd->device_identifier_type = (page_83[1] & 0x0f);
1024 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1026 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1028 int transport_dump_vpd_ident(
1029 struct t10_vpd *vpd,
1030 unsigned char *p_buf,
1033 unsigned char buf[VPD_TMP_BUF_SIZE];
1036 memset(buf, 0, VPD_TMP_BUF_SIZE);
1038 switch (vpd->device_identifier_code_set) {
1039 case 0x01: /* Binary */
1040 snprintf(buf, sizeof(buf),
1041 "T10 VPD Binary Device Identifier: %s\n",
1042 &vpd->device_identifier[0]);
1044 case 0x02: /* ASCII */
1045 snprintf(buf, sizeof(buf),
1046 "T10 VPD ASCII Device Identifier: %s\n",
1047 &vpd->device_identifier[0]);
1049 case 0x03: /* UTF-8 */
1050 snprintf(buf, sizeof(buf),
1051 "T10 VPD UTF-8 Device Identifier: %s\n",
1052 &vpd->device_identifier[0]);
1055 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1056 " 0x%02x", vpd->device_identifier_code_set);
1062 strncpy(p_buf, buf, p_buf_len);
1064 pr_debug("%s", buf);
1070 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1072 static const char hex_str[] = "0123456789abcdef";
1073 int j = 0, i = 4; /* offset to start of the identifier */
1076 * The VPD Code Set (encoding)
1078 * from spc3r23.pdf Section 7.6.3.1 Table 296
1080 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1081 switch (vpd->device_identifier_code_set) {
1082 case 0x01: /* Binary */
1083 vpd->device_identifier[j++] =
1084 hex_str[vpd->device_identifier_type];
1085 while (i < (4 + page_83[3])) {
1086 vpd->device_identifier[j++] =
1087 hex_str[(page_83[i] & 0xf0) >> 4];
1088 vpd->device_identifier[j++] =
1089 hex_str[page_83[i] & 0x0f];
1093 case 0x02: /* ASCII */
1094 case 0x03: /* UTF-8 */
1095 while (i < (4 + page_83[3]))
1096 vpd->device_identifier[j++] = page_83[i++];
1102 return transport_dump_vpd_ident(vpd, NULL, 0);
1104 EXPORT_SYMBOL(transport_set_vpd_ident);
1106 static sense_reason_t
1107 target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1112 if (!cmd->se_tfo->max_data_sg_nents)
1113 return TCM_NO_SENSE;
1115 * Check if fabric enforced maximum SGL entries per I/O descriptor
1116 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1117 * residual_count and reduce original cmd->data_length to maximum
1118 * length based on single PAGE_SIZE entry scatter-lists.
1120 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1121 if (cmd->data_length > mtl) {
1123 * If an existing CDB overflow is present, calculate new residual
1124 * based on CDB size minus fabric maximum transfer length.
1126 * If an existing CDB underflow is present, calculate new residual
1127 * based on original cmd->data_length minus fabric maximum transfer
1130 * Otherwise, set the underflow residual based on cmd->data_length
1131 * minus fabric maximum transfer length.
1133 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1134 cmd->residual_count = (size - mtl);
1135 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1136 u32 orig_dl = size + cmd->residual_count;
1137 cmd->residual_count = (orig_dl - mtl);
1139 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1140 cmd->residual_count = (cmd->data_length - mtl);
1142 cmd->data_length = mtl;
1144 * Reset sbc_check_prot() calculated protection payload
1145 * length based upon the new smaller MTL.
1147 if (cmd->prot_length) {
1148 u32 sectors = (mtl / dev->dev_attrib.block_size);
1149 cmd->prot_length = dev->prot_length * sectors;
1152 return TCM_NO_SENSE;
1156 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1158 struct se_device *dev = cmd->se_dev;
1160 if (cmd->unknown_data_length) {
1161 cmd->data_length = size;
1162 } else if (size != cmd->data_length) {
1163 pr_warn_ratelimited("TARGET_CORE[%s]: Expected Transfer Length:"
1164 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1165 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1166 cmd->data_length, size, cmd->t_task_cdb[0]);
1168 if (cmd->data_direction == DMA_TO_DEVICE) {
1169 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1170 pr_err_ratelimited("Rejecting underflow/overflow"
1171 " for WRITE data CDB\n");
1172 return TCM_INVALID_CDB_FIELD;
1175 * Some fabric drivers like iscsi-target still expect to
1176 * always reject overflow writes. Reject this case until
1177 * full fabric driver level support for overflow writes
1178 * is introduced tree-wide.
1180 if (size > cmd->data_length) {
1181 pr_err_ratelimited("Rejecting overflow for"
1182 " WRITE control CDB\n");
1183 return TCM_INVALID_CDB_FIELD;
1187 * Reject READ_* or WRITE_* with overflow/underflow for
1188 * type SCF_SCSI_DATA_CDB.
1190 if (dev->dev_attrib.block_size != 512) {
1191 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1192 " CDB on non 512-byte sector setup subsystem"
1193 " plugin: %s\n", dev->transport->name);
1194 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1195 return TCM_INVALID_CDB_FIELD;
1198 * For the overflow case keep the existing fabric provided
1199 * ->data_length. Otherwise for the underflow case, reset
1200 * ->data_length to the smaller SCSI expected data transfer
1203 if (size > cmd->data_length) {
1204 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1205 cmd->residual_count = (size - cmd->data_length);
1207 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1208 cmd->residual_count = (cmd->data_length - size);
1209 cmd->data_length = size;
1213 return target_check_max_data_sg_nents(cmd, dev, size);
1218 * Used by fabric modules containing a local struct se_cmd within their
1219 * fabric dependent per I/O descriptor.
1221 * Preserves the value of @cmd->tag.
1223 void transport_init_se_cmd(
1225 const struct target_core_fabric_ops *tfo,
1226 struct se_session *se_sess,
1230 unsigned char *sense_buffer)
1232 INIT_LIST_HEAD(&cmd->se_delayed_node);
1233 INIT_LIST_HEAD(&cmd->se_qf_node);
1234 INIT_LIST_HEAD(&cmd->se_cmd_list);
1235 INIT_LIST_HEAD(&cmd->state_list);
1236 init_completion(&cmd->t_transport_stop_comp);
1237 init_completion(&cmd->cmd_wait_comp);
1238 spin_lock_init(&cmd->t_state_lock);
1239 kref_init(&cmd->cmd_kref);
1242 cmd->se_sess = se_sess;
1243 cmd->data_length = data_length;
1244 cmd->data_direction = data_direction;
1245 cmd->sam_task_attr = task_attr;
1246 cmd->sense_buffer = sense_buffer;
1248 cmd->state_active = false;
1250 EXPORT_SYMBOL(transport_init_se_cmd);
1252 static sense_reason_t
1253 transport_check_alloc_task_attr(struct se_cmd *cmd)
1255 struct se_device *dev = cmd->se_dev;
1258 * Check if SAM Task Attribute emulation is enabled for this
1259 * struct se_device storage object
1261 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1264 if (cmd->sam_task_attr == TCM_ACA_TAG) {
1265 pr_debug("SAM Task Attribute ACA"
1266 " emulation is not supported\n");
1267 return TCM_INVALID_CDB_FIELD;
1274 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1276 struct se_device *dev = cmd->se_dev;
1280 * Ensure that the received CDB is less than the max (252 + 8) bytes
1281 * for VARIABLE_LENGTH_CMD
1283 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1284 pr_err("Received SCSI CDB with command_size: %d that"
1285 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1286 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1287 return TCM_INVALID_CDB_FIELD;
1290 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1291 * allocate the additional extended CDB buffer now.. Otherwise
1292 * setup the pointer from __t_task_cdb to t_task_cdb.
1294 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1295 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1297 if (!cmd->t_task_cdb) {
1298 pr_err("Unable to allocate cmd->t_task_cdb"
1299 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1300 scsi_command_size(cdb),
1301 (unsigned long)sizeof(cmd->__t_task_cdb));
1302 return TCM_OUT_OF_RESOURCES;
1305 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1307 * Copy the original CDB into cmd->
1309 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1311 trace_target_sequencer_start(cmd);
1313 ret = dev->transport->parse_cdb(cmd);
1314 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1315 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1316 cmd->se_tfo->get_fabric_name(),
1317 cmd->se_sess->se_node_acl->initiatorname,
1318 cmd->t_task_cdb[0]);
1322 ret = transport_check_alloc_task_attr(cmd);
1326 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1327 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
1330 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1333 * Used by fabric module frontends to queue tasks directly.
1334 * May only be used from process context.
1336 int transport_handle_cdb_direct(
1343 pr_err("cmd->se_lun is NULL\n");
1346 if (in_interrupt()) {
1348 pr_err("transport_generic_handle_cdb cannot be called"
1349 " from interrupt context\n");
1353 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1354 * outstanding descriptors are handled correctly during shutdown via
1355 * transport_wait_for_tasks()
1357 * Also, we don't take cmd->t_state_lock here as we only expect
1358 * this to be called for initial descriptor submission.
1360 cmd->t_state = TRANSPORT_NEW_CMD;
1361 cmd->transport_state |= CMD_T_ACTIVE;
1364 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1365 * so follow TRANSPORT_NEW_CMD processing thread context usage
1366 * and call transport_generic_request_failure() if necessary..
1368 ret = transport_generic_new_cmd(cmd);
1370 transport_generic_request_failure(cmd, ret);
1373 EXPORT_SYMBOL(transport_handle_cdb_direct);
1376 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1377 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1379 if (!sgl || !sgl_count)
1383 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1384 * scatterlists already have been set to follow what the fabric
1385 * passes for the original expected data transfer length.
1387 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1388 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1389 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1390 return TCM_INVALID_CDB_FIELD;
1393 cmd->t_data_sg = sgl;
1394 cmd->t_data_nents = sgl_count;
1395 cmd->t_bidi_data_sg = sgl_bidi;
1396 cmd->t_bidi_data_nents = sgl_bidi_count;
1398 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1403 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1404 * se_cmd + use pre-allocated SGL memory.
1406 * @se_cmd: command descriptor to submit
1407 * @se_sess: associated se_sess for endpoint
1408 * @cdb: pointer to SCSI CDB
1409 * @sense: pointer to SCSI sense buffer
1410 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1411 * @data_length: fabric expected data transfer length
1412 * @task_addr: SAM task attribute
1413 * @data_dir: DMA data direction
1414 * @flags: flags for command submission from target_sc_flags_tables
1415 * @sgl: struct scatterlist memory for unidirectional mapping
1416 * @sgl_count: scatterlist count for unidirectional mapping
1417 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1418 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1419 * @sgl_prot: struct scatterlist memory protection information
1420 * @sgl_prot_count: scatterlist count for protection information
1422 * Task tags are supported if the caller has set @se_cmd->tag.
1424 * Returns non zero to signal active I/O shutdown failure. All other
1425 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1426 * but still return zero here.
1428 * This may only be called from process context, and also currently
1429 * assumes internal allocation of fabric payload buffer by target-core.
1431 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1432 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1433 u32 data_length, int task_attr, int data_dir, int flags,
1434 struct scatterlist *sgl, u32 sgl_count,
1435 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1436 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1438 struct se_portal_group *se_tpg;
1442 se_tpg = se_sess->se_tpg;
1444 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1445 BUG_ON(in_interrupt());
1447 * Initialize se_cmd for target operation. From this point
1448 * exceptions are handled by sending exception status via
1449 * target_core_fabric_ops->queue_status() callback
1451 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1452 data_length, data_dir, task_attr, sense);
1454 if (flags & TARGET_SCF_USE_CPUID)
1455 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1457 se_cmd->cpuid = WORK_CPU_UNBOUND;
1459 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1460 se_cmd->unknown_data_length = 1;
1462 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1463 * se_sess->sess_cmd_list. A second kref_get here is necessary
1464 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1465 * kref_put() to happen during fabric packet acknowledgement.
1467 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1471 * Signal bidirectional data payloads to target-core
1473 if (flags & TARGET_SCF_BIDI_OP)
1474 se_cmd->se_cmd_flags |= SCF_BIDI;
1476 * Locate se_lun pointer and attach it to struct se_cmd
1478 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1480 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1481 target_put_sess_cmd(se_cmd);
1485 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1487 transport_generic_request_failure(se_cmd, rc);
1492 * Save pointers for SGLs containing protection information,
1495 if (sgl_prot_count) {
1496 se_cmd->t_prot_sg = sgl_prot;
1497 se_cmd->t_prot_nents = sgl_prot_count;
1498 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
1502 * When a non zero sgl_count has been passed perform SGL passthrough
1503 * mapping for pre-allocated fabric memory instead of having target
1504 * core perform an internal SGL allocation..
1506 if (sgl_count != 0) {
1510 * A work-around for tcm_loop as some userspace code via
1511 * scsi-generic do not memset their associated read buffers,
1512 * so go ahead and do that here for type non-data CDBs. Also
1513 * note that this is currently guaranteed to be a single SGL
1514 * for this case by target core in target_setup_cmd_from_cdb()
1515 * -> transport_generic_cmd_sequencer().
1517 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1518 se_cmd->data_direction == DMA_FROM_DEVICE) {
1519 unsigned char *buf = NULL;
1522 buf = kmap(sg_page(sgl)) + sgl->offset;
1525 memset(buf, 0, sgl->length);
1526 kunmap(sg_page(sgl));
1530 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1531 sgl_bidi, sgl_bidi_count);
1533 transport_generic_request_failure(se_cmd, rc);
1539 * Check if we need to delay processing because of ALUA
1540 * Active/NonOptimized primary access state..
1542 core_alua_check_nonop_delay(se_cmd);
1544 transport_handle_cdb_direct(se_cmd);
1547 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1550 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1552 * @se_cmd: command descriptor to submit
1553 * @se_sess: associated se_sess for endpoint
1554 * @cdb: pointer to SCSI CDB
1555 * @sense: pointer to SCSI sense buffer
1556 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1557 * @data_length: fabric expected data transfer length
1558 * @task_addr: SAM task attribute
1559 * @data_dir: DMA data direction
1560 * @flags: flags for command submission from target_sc_flags_tables
1562 * Task tags are supported if the caller has set @se_cmd->tag.
1564 * Returns non zero to signal active I/O shutdown failure. All other
1565 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1566 * but still return zero here.
1568 * This may only be called from process context, and also currently
1569 * assumes internal allocation of fabric payload buffer by target-core.
1571 * It also assumes interal target core SGL memory allocation.
1573 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1574 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1575 u32 data_length, int task_attr, int data_dir, int flags)
1577 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1578 unpacked_lun, data_length, task_attr, data_dir,
1579 flags, NULL, 0, NULL, 0, NULL, 0);
1581 EXPORT_SYMBOL(target_submit_cmd);
1583 static void target_complete_tmr_failure(struct work_struct *work)
1585 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1587 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1588 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1590 transport_cmd_check_stop_to_fabric(se_cmd);
1594 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1597 * @se_cmd: command descriptor to submit
1598 * @se_sess: associated se_sess for endpoint
1599 * @sense: pointer to SCSI sense buffer
1600 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1601 * @fabric_context: fabric context for TMR req
1602 * @tm_type: Type of TM request
1603 * @gfp: gfp type for caller
1604 * @tag: referenced task tag for TMR_ABORT_TASK
1605 * @flags: submit cmd flags
1607 * Callable from all contexts.
1610 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1611 unsigned char *sense, u64 unpacked_lun,
1612 void *fabric_tmr_ptr, unsigned char tm_type,
1613 gfp_t gfp, u64 tag, int flags)
1615 struct se_portal_group *se_tpg;
1618 se_tpg = se_sess->se_tpg;
1621 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1622 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
1624 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1625 * allocation failure.
1627 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1631 if (tm_type == TMR_ABORT_TASK)
1632 se_cmd->se_tmr_req->ref_task_tag = tag;
1634 /* See target_submit_cmd for commentary */
1635 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1637 core_tmr_release_req(se_cmd->se_tmr_req);
1641 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1644 * For callback during failure handling, push this work off
1645 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1647 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1648 schedule_work(&se_cmd->work);
1651 transport_generic_handle_tmr(se_cmd);
1654 EXPORT_SYMBOL(target_submit_tmr);
1657 * Handle SAM-esque emulation for generic transport request failures.
1659 void transport_generic_request_failure(struct se_cmd *cmd,
1660 sense_reason_t sense_reason)
1662 int ret = 0, post_ret = 0;
1664 if (transport_check_aborted_status(cmd, 1))
1667 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1668 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
1669 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1670 cmd->se_tfo->get_cmd_state(cmd),
1671 cmd->t_state, sense_reason);
1672 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1673 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1674 (cmd->transport_state & CMD_T_STOP) != 0,
1675 (cmd->transport_state & CMD_T_SENT) != 0);
1678 * For SAM Task Attribute emulation for failed struct se_cmd
1680 transport_complete_task_attr(cmd);
1682 * Handle special case for COMPARE_AND_WRITE failure, where the
1683 * callback is expected to drop the per device ->caw_sem.
1685 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1686 cmd->transport_complete_callback)
1687 cmd->transport_complete_callback(cmd, false, &post_ret);
1689 switch (sense_reason) {
1690 case TCM_NON_EXISTENT_LUN:
1691 case TCM_UNSUPPORTED_SCSI_OPCODE:
1692 case TCM_INVALID_CDB_FIELD:
1693 case TCM_INVALID_PARAMETER_LIST:
1694 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1695 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1696 case TCM_UNKNOWN_MODE_PAGE:
1697 case TCM_WRITE_PROTECTED:
1698 case TCM_ADDRESS_OUT_OF_RANGE:
1699 case TCM_CHECK_CONDITION_ABORT_CMD:
1700 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1701 case TCM_CHECK_CONDITION_NOT_READY:
1702 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1703 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1704 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1705 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
1706 case TCM_TOO_MANY_TARGET_DESCS:
1707 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE:
1708 case TCM_TOO_MANY_SEGMENT_DESCS:
1709 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE:
1711 case TCM_OUT_OF_RESOURCES:
1712 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1714 case TCM_RESERVATION_CONFLICT:
1716 * No SENSE Data payload for this case, set SCSI Status
1717 * and queue the response to $FABRIC_MOD.
1719 * Uses linux/include/scsi/scsi.h SAM status codes defs
1721 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1723 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1724 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1727 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1730 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1731 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1732 cmd->orig_fe_lun, 0x2C,
1733 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1735 trace_target_cmd_complete(cmd);
1736 ret = cmd->se_tfo->queue_status(cmd);
1741 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1742 cmd->t_task_cdb[0], sense_reason);
1743 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1747 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1752 transport_lun_remove_cmd(cmd);
1753 transport_cmd_check_stop_to_fabric(cmd);
1757 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
1759 EXPORT_SYMBOL(transport_generic_request_failure);
1761 void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
1765 if (!cmd->execute_cmd) {
1766 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1771 * Check for an existing UNIT ATTENTION condition after
1772 * target_handle_task_attr() has done SAM task attr
1773 * checking, and possibly have already defered execution
1774 * out to target_restart_delayed_cmds() context.
1776 ret = target_scsi3_ua_check(cmd);
1780 ret = target_alua_state_check(cmd);
1784 ret = target_check_reservation(cmd);
1786 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1791 ret = cmd->execute_cmd(cmd);
1795 spin_lock_irq(&cmd->t_state_lock);
1796 cmd->transport_state &= ~CMD_T_SENT;
1797 spin_unlock_irq(&cmd->t_state_lock);
1799 transport_generic_request_failure(cmd, ret);
1802 static int target_write_prot_action(struct se_cmd *cmd)
1806 * Perform WRITE_INSERT of PI using software emulation when backend
1807 * device has PI enabled, if the transport has not already generated
1808 * PI using hardware WRITE_INSERT offload.
1810 switch (cmd->prot_op) {
1811 case TARGET_PROT_DOUT_INSERT:
1812 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1813 sbc_dif_generate(cmd);
1815 case TARGET_PROT_DOUT_STRIP:
1816 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1819 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
1820 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1821 sectors, 0, cmd->t_prot_sg, 0);
1822 if (unlikely(cmd->pi_err)) {
1823 spin_lock_irq(&cmd->t_state_lock);
1824 cmd->transport_state &= ~CMD_T_SENT;
1825 spin_unlock_irq(&cmd->t_state_lock);
1826 transport_generic_request_failure(cmd, cmd->pi_err);
1837 static bool target_handle_task_attr(struct se_cmd *cmd)
1839 struct se_device *dev = cmd->se_dev;
1841 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1844 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1847 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1848 * to allow the passed struct se_cmd list of tasks to the front of the list.
1850 switch (cmd->sam_task_attr) {
1852 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1853 cmd->t_task_cdb[0]);
1855 case TCM_ORDERED_TAG:
1856 atomic_inc_mb(&dev->dev_ordered_sync);
1858 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1859 cmd->t_task_cdb[0]);
1862 * Execute an ORDERED command if no other older commands
1863 * exist that need to be completed first.
1865 if (!atomic_read(&dev->simple_cmds))
1870 * For SIMPLE and UNTAGGED Task Attribute commands
1872 atomic_inc_mb(&dev->simple_cmds);
1876 if (atomic_read(&dev->dev_ordered_sync) == 0)
1879 spin_lock(&dev->delayed_cmd_lock);
1880 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1881 spin_unlock(&dev->delayed_cmd_lock);
1883 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1884 cmd->t_task_cdb[0], cmd->sam_task_attr);
1888 static int __transport_check_aborted_status(struct se_cmd *, int);
1890 void target_execute_cmd(struct se_cmd *cmd)
1893 * Determine if frontend context caller is requesting the stopping of
1894 * this command for frontend exceptions.
1896 * If the received CDB has aleady been aborted stop processing it here.
1898 spin_lock_irq(&cmd->t_state_lock);
1899 if (__transport_check_aborted_status(cmd, 1)) {
1900 spin_unlock_irq(&cmd->t_state_lock);
1903 if (cmd->transport_state & CMD_T_STOP) {
1904 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1905 __func__, __LINE__, cmd->tag);
1907 spin_unlock_irq(&cmd->t_state_lock);
1908 complete_all(&cmd->t_transport_stop_comp);
1912 cmd->t_state = TRANSPORT_PROCESSING;
1913 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
1914 spin_unlock_irq(&cmd->t_state_lock);
1916 if (target_write_prot_action(cmd))
1919 if (target_handle_task_attr(cmd)) {
1920 spin_lock_irq(&cmd->t_state_lock);
1921 cmd->transport_state &= ~CMD_T_SENT;
1922 spin_unlock_irq(&cmd->t_state_lock);
1926 __target_execute_cmd(cmd, true);
1928 EXPORT_SYMBOL(target_execute_cmd);
1931 * Process all commands up to the last received ORDERED task attribute which
1932 * requires another blocking boundary
1934 static void target_restart_delayed_cmds(struct se_device *dev)
1939 spin_lock(&dev->delayed_cmd_lock);
1940 if (list_empty(&dev->delayed_cmd_list)) {
1941 spin_unlock(&dev->delayed_cmd_lock);
1945 cmd = list_entry(dev->delayed_cmd_list.next,
1946 struct se_cmd, se_delayed_node);
1947 list_del(&cmd->se_delayed_node);
1948 spin_unlock(&dev->delayed_cmd_lock);
1950 __target_execute_cmd(cmd, true);
1952 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
1958 * Called from I/O completion to determine which dormant/delayed
1959 * and ordered cmds need to have their tasks added to the execution queue.
1961 static void transport_complete_task_attr(struct se_cmd *cmd)
1963 struct se_device *dev = cmd->se_dev;
1965 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1968 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
1971 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
1972 atomic_dec_mb(&dev->simple_cmds);
1973 dev->dev_cur_ordered_id++;
1974 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
1975 dev->dev_cur_ordered_id++;
1976 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1977 dev->dev_cur_ordered_id);
1978 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
1979 atomic_dec_mb(&dev->dev_ordered_sync);
1981 dev->dev_cur_ordered_id++;
1982 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1983 dev->dev_cur_ordered_id);
1986 target_restart_delayed_cmds(dev);
1989 static void transport_complete_qf(struct se_cmd *cmd)
1993 transport_complete_task_attr(cmd);
1995 * If a fabric driver ->write_pending() or ->queue_data_in() callback
1996 * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and
1997 * the same callbacks should not be retried. Return CHECK_CONDITION
1998 * if a scsi_status is not already set.
2000 * If a fabric driver ->queue_status() has returned non zero, always
2001 * keep retrying no matter what..
2003 if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) {
2004 if (cmd->scsi_status)
2007 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2008 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2009 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2010 translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
2014 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
2017 switch (cmd->data_direction) {
2018 case DMA_FROM_DEVICE:
2019 if (cmd->scsi_status)
2022 trace_target_cmd_complete(cmd);
2023 ret = cmd->se_tfo->queue_data_in(cmd);
2026 if (cmd->se_cmd_flags & SCF_BIDI) {
2027 ret = cmd->se_tfo->queue_data_in(cmd);
2030 /* Fall through for DMA_TO_DEVICE */
2033 trace_target_cmd_complete(cmd);
2034 ret = cmd->se_tfo->queue_status(cmd);
2041 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
2044 transport_lun_remove_cmd(cmd);
2045 transport_cmd_check_stop_to_fabric(cmd);
2048 static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev,
2049 int err, bool write_pending)
2052 * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or
2053 * ->queue_data_in() callbacks from new process context.
2055 * Otherwise for other errors, transport_complete_qf() will send
2056 * CHECK_CONDITION via ->queue_status() instead of attempting to
2057 * retry associated fabric driver data-transfer callbacks.
2059 if (err == -EAGAIN || err == -ENOMEM) {
2060 cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP :
2061 TRANSPORT_COMPLETE_QF_OK;
2063 pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err);
2064 cmd->t_state = TRANSPORT_COMPLETE_QF_ERR;
2067 spin_lock_irq(&dev->qf_cmd_lock);
2068 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2069 atomic_inc_mb(&dev->dev_qf_count);
2070 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2072 schedule_work(&cmd->se_dev->qf_work_queue);
2075 static bool target_read_prot_action(struct se_cmd *cmd)
2077 switch (cmd->prot_op) {
2078 case TARGET_PROT_DIN_STRIP:
2079 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
2080 u32 sectors = cmd->data_length >>
2081 ilog2(cmd->se_dev->dev_attrib.block_size);
2083 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2084 sectors, 0, cmd->t_prot_sg,
2090 case TARGET_PROT_DIN_INSERT:
2091 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2094 sbc_dif_generate(cmd);
2103 static void target_complete_ok_work(struct work_struct *work)
2105 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2109 * Check if we need to move delayed/dormant tasks from cmds on the
2110 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2113 transport_complete_task_attr(cmd);
2116 * Check to schedule QUEUE_FULL work, or execute an existing
2117 * cmd->transport_qf_callback()
2119 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2120 schedule_work(&cmd->se_dev->qf_work_queue);
2123 * Check if we need to send a sense buffer from
2124 * the struct se_cmd in question.
2126 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2127 WARN_ON(!cmd->scsi_status);
2128 ret = transport_send_check_condition_and_sense(
2133 transport_lun_remove_cmd(cmd);
2134 transport_cmd_check_stop_to_fabric(cmd);
2138 * Check for a callback, used by amongst other things
2139 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
2141 if (cmd->transport_complete_callback) {
2143 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2144 bool zero_dl = !(cmd->data_length);
2147 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2148 if (!rc && !post_ret) {
2154 ret = transport_send_check_condition_and_sense(cmd,
2159 transport_lun_remove_cmd(cmd);
2160 transport_cmd_check_stop_to_fabric(cmd);
2166 switch (cmd->data_direction) {
2167 case DMA_FROM_DEVICE:
2168 if (cmd->scsi_status)
2171 atomic_long_add(cmd->data_length,
2172 &cmd->se_lun->lun_stats.tx_data_octets);
2174 * Perform READ_STRIP of PI using software emulation when
2175 * backend had PI enabled, if the transport will not be
2176 * performing hardware READ_STRIP offload.
2178 if (target_read_prot_action(cmd)) {
2179 ret = transport_send_check_condition_and_sense(cmd,
2184 transport_lun_remove_cmd(cmd);
2185 transport_cmd_check_stop_to_fabric(cmd);
2189 trace_target_cmd_complete(cmd);
2190 ret = cmd->se_tfo->queue_data_in(cmd);
2195 atomic_long_add(cmd->data_length,
2196 &cmd->se_lun->lun_stats.rx_data_octets);
2198 * Check if we need to send READ payload for BIDI-COMMAND
2200 if (cmd->se_cmd_flags & SCF_BIDI) {
2201 atomic_long_add(cmd->data_length,
2202 &cmd->se_lun->lun_stats.tx_data_octets);
2203 ret = cmd->se_tfo->queue_data_in(cmd);
2208 /* Fall through for DMA_TO_DEVICE */
2211 trace_target_cmd_complete(cmd);
2212 ret = cmd->se_tfo->queue_status(cmd);
2220 transport_lun_remove_cmd(cmd);
2221 transport_cmd_check_stop_to_fabric(cmd);
2225 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2226 " data_direction: %d\n", cmd, cmd->data_direction);
2228 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
2231 void target_free_sgl(struct scatterlist *sgl, int nents)
2233 struct scatterlist *sg;
2236 for_each_sg(sgl, sg, nents, count)
2237 __free_page(sg_page(sg));
2241 EXPORT_SYMBOL(target_free_sgl);
2243 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2246 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2247 * emulation, and free + reset pointers if necessary..
2249 if (!cmd->t_data_sg_orig)
2252 kfree(cmd->t_data_sg);
2253 cmd->t_data_sg = cmd->t_data_sg_orig;
2254 cmd->t_data_sg_orig = NULL;
2255 cmd->t_data_nents = cmd->t_data_nents_orig;
2256 cmd->t_data_nents_orig = 0;
2259 static inline void transport_free_pages(struct se_cmd *cmd)
2261 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2262 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2263 cmd->t_prot_sg = NULL;
2264 cmd->t_prot_nents = 0;
2267 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2269 * Release special case READ buffer payload required for
2270 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2272 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2273 target_free_sgl(cmd->t_bidi_data_sg,
2274 cmd->t_bidi_data_nents);
2275 cmd->t_bidi_data_sg = NULL;
2276 cmd->t_bidi_data_nents = 0;
2278 transport_reset_sgl_orig(cmd);
2281 transport_reset_sgl_orig(cmd);
2283 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2284 cmd->t_data_sg = NULL;
2285 cmd->t_data_nents = 0;
2287 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2288 cmd->t_bidi_data_sg = NULL;
2289 cmd->t_bidi_data_nents = 0;
2293 * transport_put_cmd - release a reference to a command
2294 * @cmd: command to release
2296 * This routine releases our reference to the command and frees it if possible.
2298 static int transport_put_cmd(struct se_cmd *cmd)
2300 BUG_ON(!cmd->se_tfo);
2302 * If this cmd has been setup with target_get_sess_cmd(), drop
2303 * the kref and call ->release_cmd() in kref callback.
2305 return target_put_sess_cmd(cmd);
2308 void *transport_kmap_data_sg(struct se_cmd *cmd)
2310 struct scatterlist *sg = cmd->t_data_sg;
2311 struct page **pages;
2315 * We need to take into account a possible offset here for fabrics like
2316 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2317 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2319 if (!cmd->t_data_nents)
2323 if (cmd->t_data_nents == 1)
2324 return kmap(sg_page(sg)) + sg->offset;
2326 /* >1 page. use vmap */
2327 pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL);
2331 /* convert sg[] to pages[] */
2332 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2333 pages[i] = sg_page(sg);
2336 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2338 if (!cmd->t_data_vmap)
2341 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2343 EXPORT_SYMBOL(transport_kmap_data_sg);
2345 void transport_kunmap_data_sg(struct se_cmd *cmd)
2347 if (!cmd->t_data_nents) {
2349 } else if (cmd->t_data_nents == 1) {
2350 kunmap(sg_page(cmd->t_data_sg));
2354 vunmap(cmd->t_data_vmap);
2355 cmd->t_data_vmap = NULL;
2357 EXPORT_SYMBOL(transport_kunmap_data_sg);
2360 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2361 bool zero_page, bool chainable)
2363 struct scatterlist *sg;
2365 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2366 unsigned int nalloc, nent;
2369 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2372 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
2376 sg_init_table(sg, nalloc);
2379 u32 page_len = min_t(u32, length, PAGE_SIZE);
2380 page = alloc_page(GFP_KERNEL | zero_flag);
2384 sg_set_page(&sg[i], page, page_len, 0);
2395 __free_page(sg_page(&sg[i]));
2400 EXPORT_SYMBOL(target_alloc_sgl);
2403 * Allocate any required resources to execute the command. For writes we
2404 * might not have the payload yet, so notify the fabric via a call to
2405 * ->write_pending instead. Otherwise place it on the execution queue.
2408 transport_generic_new_cmd(struct se_cmd *cmd)
2410 unsigned long flags;
2412 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2414 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2415 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2416 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2417 cmd->prot_length, true, false);
2419 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2423 * Determine is the TCM fabric module has already allocated physical
2424 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2427 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2430 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2431 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2434 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2435 bidi_length = cmd->t_task_nolb *
2436 cmd->se_dev->dev_attrib.block_size;
2438 bidi_length = cmd->data_length;
2440 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2441 &cmd->t_bidi_data_nents,
2442 bidi_length, zero_flag, false);
2444 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2447 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2448 cmd->data_length, zero_flag, false);
2450 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2451 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2454 * Special case for COMPARE_AND_WRITE with fabrics
2455 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2457 u32 caw_length = cmd->t_task_nolb *
2458 cmd->se_dev->dev_attrib.block_size;
2460 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2461 &cmd->t_bidi_data_nents,
2462 caw_length, zero_flag, false);
2464 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2467 * If this command is not a write we can execute it right here,
2468 * for write buffers we need to notify the fabric driver first
2469 * and let it call back once the write buffers are ready.
2471 target_add_to_state_list(cmd);
2472 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
2473 target_execute_cmd(cmd);
2477 spin_lock_irqsave(&cmd->t_state_lock, flags);
2478 cmd->t_state = TRANSPORT_WRITE_PENDING;
2480 * Determine if frontend context caller is requesting the stopping of
2481 * this command for frontend exceptions.
2483 if (cmd->transport_state & CMD_T_STOP) {
2484 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
2485 __func__, __LINE__, cmd->tag);
2487 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2489 complete_all(&cmd->t_transport_stop_comp);
2492 cmd->transport_state &= ~CMD_T_ACTIVE;
2493 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2495 ret = cmd->se_tfo->write_pending(cmd);
2502 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2503 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
2506 EXPORT_SYMBOL(transport_generic_new_cmd);
2508 static void transport_write_pending_qf(struct se_cmd *cmd)
2512 ret = cmd->se_tfo->write_pending(cmd);
2514 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2516 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
2521 __transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2522 unsigned long *flags);
2524 static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2526 unsigned long flags;
2528 spin_lock_irqsave(&cmd->t_state_lock, flags);
2529 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2530 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2533 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2536 bool aborted = false, tas = false;
2538 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2539 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2540 target_wait_free_cmd(cmd, &aborted, &tas);
2542 if (!aborted || tas)
2543 ret = transport_put_cmd(cmd);
2546 target_wait_free_cmd(cmd, &aborted, &tas);
2548 * Handle WRITE failure case where transport_generic_new_cmd()
2549 * has already added se_cmd to state_list, but fabric has
2550 * failed command before I/O submission.
2552 if (cmd->state_active)
2553 target_remove_from_state_list(cmd);
2556 transport_lun_remove_cmd(cmd);
2558 if (!aborted || tas)
2559 ret = transport_put_cmd(cmd);
2562 * If the task has been internally aborted due to TMR ABORT_TASK
2563 * or LUN_RESET, target_core_tmr.c is responsible for performing
2564 * the remaining calls to target_put_sess_cmd(), and not the
2565 * callers of this function.
2568 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2569 wait_for_completion(&cmd->cmd_wait_comp);
2570 cmd->se_tfo->release_cmd(cmd);
2575 EXPORT_SYMBOL(transport_generic_free_cmd);
2577 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2578 * @se_cmd: command descriptor to add
2579 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2581 int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
2583 struct se_session *se_sess = se_cmd->se_sess;
2584 unsigned long flags;
2588 * Add a second kref if the fabric caller is expecting to handle
2589 * fabric acknowledgement that requires two target_put_sess_cmd()
2590 * invocations before se_cmd descriptor release.
2593 if (!kref_get_unless_zero(&se_cmd->cmd_kref))
2596 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2599 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2600 if (se_sess->sess_tearing_down) {
2604 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2606 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2608 if (ret && ack_kref)
2609 target_put_sess_cmd(se_cmd);
2613 EXPORT_SYMBOL(target_get_sess_cmd);
2615 static void target_free_cmd_mem(struct se_cmd *cmd)
2617 transport_free_pages(cmd);
2619 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2620 core_tmr_release_req(cmd->se_tmr_req);
2621 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2622 kfree(cmd->t_task_cdb);
2625 static void target_release_cmd_kref(struct kref *kref)
2627 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2628 struct se_session *se_sess = se_cmd->se_sess;
2629 unsigned long flags;
2633 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2635 spin_lock(&se_cmd->t_state_lock);
2636 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2637 (se_cmd->transport_state & CMD_T_ABORTED);
2638 spin_unlock(&se_cmd->t_state_lock);
2640 if (se_cmd->cmd_wait_set || fabric_stop) {
2641 list_del_init(&se_cmd->se_cmd_list);
2642 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2643 target_free_cmd_mem(se_cmd);
2644 complete(&se_cmd->cmd_wait_comp);
2647 list_del_init(&se_cmd->se_cmd_list);
2648 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2651 target_free_cmd_mem(se_cmd);
2652 se_cmd->se_tfo->release_cmd(se_cmd);
2656 * target_put_sess_cmd - decrease the command reference count
2657 * @se_cmd: command to drop a reference from
2659 * Returns 1 if and only if this target_put_sess_cmd() call caused the
2660 * refcount to drop to zero. Returns zero otherwise.
2662 int target_put_sess_cmd(struct se_cmd *se_cmd)
2664 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2666 EXPORT_SYMBOL(target_put_sess_cmd);
2668 /* target_sess_cmd_list_set_waiting - Flag all commands in
2669 * sess_cmd_list to complete cmd_wait_comp. Set
2670 * sess_tearing_down so no more commands are queued.
2671 * @se_sess: session to flag
2673 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2675 struct se_cmd *se_cmd, *tmp_cmd;
2676 unsigned long flags;
2679 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2680 if (se_sess->sess_tearing_down) {
2681 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2684 se_sess->sess_tearing_down = 1;
2685 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2687 list_for_each_entry_safe(se_cmd, tmp_cmd,
2688 &se_sess->sess_wait_list, se_cmd_list) {
2689 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2691 se_cmd->cmd_wait_set = 1;
2692 spin_lock(&se_cmd->t_state_lock);
2693 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2694 spin_unlock(&se_cmd->t_state_lock);
2696 list_del_init(&se_cmd->se_cmd_list);
2699 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2701 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2703 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2704 * @se_sess: session to wait for active I/O
2706 void target_wait_for_sess_cmds(struct se_session *se_sess)
2708 struct se_cmd *se_cmd, *tmp_cmd;
2709 unsigned long flags;
2712 list_for_each_entry_safe(se_cmd, tmp_cmd,
2713 &se_sess->sess_wait_list, se_cmd_list) {
2714 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2715 " %d\n", se_cmd, se_cmd->t_state,
2716 se_cmd->se_tfo->get_cmd_state(se_cmd));
2718 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2719 tas = (se_cmd->transport_state & CMD_T_TAS);
2720 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2722 if (!target_put_sess_cmd(se_cmd)) {
2724 target_put_sess_cmd(se_cmd);
2727 wait_for_completion(&se_cmd->cmd_wait_comp);
2728 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2729 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2730 se_cmd->se_tfo->get_cmd_state(se_cmd));
2732 se_cmd->se_tfo->release_cmd(se_cmd);
2735 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2736 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2737 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2740 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2742 static void target_lun_confirm(struct percpu_ref *ref)
2744 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
2746 complete(&lun->lun_ref_comp);
2749 void transport_clear_lun_ref(struct se_lun *lun)
2752 * Mark the percpu-ref as DEAD, switch to atomic_t mode, drop
2753 * the initial reference and schedule confirm kill to be
2754 * executed after one full RCU grace period has completed.
2756 percpu_ref_kill_and_confirm(&lun->lun_ref, target_lun_confirm);
2758 * The first completion waits for percpu_ref_switch_to_atomic_rcu()
2759 * to call target_lun_confirm after lun->lun_ref has been marked
2760 * as __PERCPU_REF_DEAD on all CPUs, and switches to atomic_t
2761 * mode so that percpu_ref_tryget_live() lookup of lun->lun_ref
2762 * fails for all new incoming I/O.
2764 wait_for_completion(&lun->lun_ref_comp);
2766 * The second completion waits for percpu_ref_put_many() to
2767 * invoke ->release() after lun->lun_ref has switched to
2768 * atomic_t mode, and lun->lun_ref.count has reached zero.
2770 * At this point all target-core lun->lun_ref references have
2771 * been dropped via transport_lun_remove_cmd(), and it's safe
2772 * to proceed with the remaining LUN shutdown.
2774 wait_for_completion(&lun->lun_shutdown_comp);
2778 __transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2779 bool *aborted, bool *tas, unsigned long *flags)
2780 __releases(&cmd->t_state_lock)
2781 __acquires(&cmd->t_state_lock)
2784 assert_spin_locked(&cmd->t_state_lock);
2785 WARN_ON_ONCE(!irqs_disabled());
2788 cmd->transport_state |= CMD_T_FABRIC_STOP;
2790 if (cmd->transport_state & CMD_T_ABORTED)
2793 if (cmd->transport_state & CMD_T_TAS)
2796 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2797 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2800 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2801 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2804 if (!(cmd->transport_state & CMD_T_ACTIVE))
2807 if (fabric_stop && *aborted)
2810 cmd->transport_state |= CMD_T_STOP;
2812 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2813 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2814 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2816 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
2818 wait_for_completion(&cmd->t_transport_stop_comp);
2820 spin_lock_irqsave(&cmd->t_state_lock, *flags);
2821 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2823 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2824 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
2830 * transport_wait_for_tasks - set CMD_T_STOP and wait for t_transport_stop_comp
2831 * @cmd: command to wait on
2833 bool transport_wait_for_tasks(struct se_cmd *cmd)
2835 unsigned long flags;
2836 bool ret, aborted = false, tas = false;
2838 spin_lock_irqsave(&cmd->t_state_lock, flags);
2839 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
2840 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2844 EXPORT_SYMBOL(transport_wait_for_tasks);
2850 bool add_sector_info;
2853 static const struct sense_info sense_info_table[] = {
2857 [TCM_NON_EXISTENT_LUN] = {
2858 .key = ILLEGAL_REQUEST,
2859 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2861 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2862 .key = ILLEGAL_REQUEST,
2863 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2865 [TCM_SECTOR_COUNT_TOO_MANY] = {
2866 .key = ILLEGAL_REQUEST,
2867 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2869 [TCM_UNKNOWN_MODE_PAGE] = {
2870 .key = ILLEGAL_REQUEST,
2871 .asc = 0x24, /* INVALID FIELD IN CDB */
2873 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2874 .key = ABORTED_COMMAND,
2875 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2878 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2879 .key = ABORTED_COMMAND,
2880 .asc = 0x0c, /* WRITE ERROR */
2881 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2883 [TCM_INVALID_CDB_FIELD] = {
2884 .key = ILLEGAL_REQUEST,
2885 .asc = 0x24, /* INVALID FIELD IN CDB */
2887 [TCM_INVALID_PARAMETER_LIST] = {
2888 .key = ILLEGAL_REQUEST,
2889 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2891 [TCM_TOO_MANY_TARGET_DESCS] = {
2892 .key = ILLEGAL_REQUEST,
2894 .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */
2896 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = {
2897 .key = ILLEGAL_REQUEST,
2899 .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */
2901 [TCM_TOO_MANY_SEGMENT_DESCS] = {
2902 .key = ILLEGAL_REQUEST,
2904 .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */
2906 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = {
2907 .key = ILLEGAL_REQUEST,
2909 .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */
2911 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2912 .key = ILLEGAL_REQUEST,
2913 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2915 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2916 .key = ILLEGAL_REQUEST,
2917 .asc = 0x0c, /* WRITE ERROR */
2918 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2920 [TCM_SERVICE_CRC_ERROR] = {
2921 .key = ABORTED_COMMAND,
2922 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2923 .ascq = 0x05, /* N/A */
2925 [TCM_SNACK_REJECTED] = {
2926 .key = ABORTED_COMMAND,
2927 .asc = 0x11, /* READ ERROR */
2928 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2930 [TCM_WRITE_PROTECTED] = {
2931 .key = DATA_PROTECT,
2932 .asc = 0x27, /* WRITE PROTECTED */
2934 [TCM_ADDRESS_OUT_OF_RANGE] = {
2935 .key = ILLEGAL_REQUEST,
2936 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2938 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2939 .key = UNIT_ATTENTION,
2941 [TCM_CHECK_CONDITION_NOT_READY] = {
2944 [TCM_MISCOMPARE_VERIFY] = {
2946 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2949 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
2950 .key = ABORTED_COMMAND,
2952 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2953 .add_sector_info = true,
2955 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
2956 .key = ABORTED_COMMAND,
2958 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2959 .add_sector_info = true,
2961 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
2962 .key = ABORTED_COMMAND,
2964 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2965 .add_sector_info = true,
2967 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
2968 .key = COPY_ABORTED,
2970 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
2973 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2975 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2976 * Solaris initiators. Returning NOT READY instead means the
2977 * operations will be retried a finite number of times and we
2978 * can survive intermittent errors.
2981 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2985 static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
2987 const struct sense_info *si;
2988 u8 *buffer = cmd->sense_buffer;
2989 int r = (__force int)reason;
2991 bool desc_format = target_sense_desc_format(cmd->se_dev);
2993 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2994 si = &sense_info_table[r];
2996 si = &sense_info_table[(__force int)
2997 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2999 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
3000 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3001 WARN_ON_ONCE(asc == 0);
3002 } else if (si->asc == 0) {
3003 WARN_ON_ONCE(cmd->scsi_asc == 0);
3004 asc = cmd->scsi_asc;
3005 ascq = cmd->scsi_ascq;
3011 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
3012 if (si->add_sector_info)
3013 return scsi_set_sense_information(buffer,
3014 cmd->scsi_sense_length,
3021 transport_send_check_condition_and_sense(struct se_cmd *cmd,
3022 sense_reason_t reason, int from_transport)
3024 unsigned long flags;
3026 spin_lock_irqsave(&cmd->t_state_lock, flags);
3027 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3028 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3031 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
3032 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3034 if (!from_transport) {
3037 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
3038 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3039 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
3040 rc = translate_sense_reason(cmd, reason);
3045 trace_target_cmd_complete(cmd);
3046 return cmd->se_tfo->queue_status(cmd);
3048 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3050 static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3051 __releases(&cmd->t_state_lock)
3052 __acquires(&cmd->t_state_lock)
3056 assert_spin_locked(&cmd->t_state_lock);
3057 WARN_ON_ONCE(!irqs_disabled());
3059 if (!(cmd->transport_state & CMD_T_ABORTED))
3062 * If cmd has been aborted but either no status is to be sent or it has
3063 * already been sent, just return
3065 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
3067 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
3071 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
3072 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
3074 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
3075 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3076 trace_target_cmd_complete(cmd);
3078 spin_unlock_irq(&cmd->t_state_lock);
3079 ret = cmd->se_tfo->queue_status(cmd);
3081 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
3082 spin_lock_irq(&cmd->t_state_lock);
3087 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3091 spin_lock_irq(&cmd->t_state_lock);
3092 ret = __transport_check_aborted_status(cmd, send_status);
3093 spin_unlock_irq(&cmd->t_state_lock);
3097 EXPORT_SYMBOL(transport_check_aborted_status);
3099 void transport_send_task_abort(struct se_cmd *cmd)
3101 unsigned long flags;
3104 spin_lock_irqsave(&cmd->t_state_lock, flags);
3105 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
3106 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3109 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3112 * If there are still expected incoming fabric WRITEs, we wait
3113 * until until they have completed before sending a TASK_ABORTED
3114 * response. This response with TASK_ABORTED status will be
3115 * queued back to fabric module by transport_check_aborted_status().
3117 if (cmd->data_direction == DMA_TO_DEVICE) {
3118 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3119 spin_lock_irqsave(&cmd->t_state_lock, flags);
3120 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3121 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3124 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
3125 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3130 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3132 transport_lun_remove_cmd(cmd);
3134 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3135 cmd->t_task_cdb[0], cmd->tag);
3137 trace_target_cmd_complete(cmd);
3138 ret = cmd->se_tfo->queue_status(cmd);
3140 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
3143 static void target_tmr_work(struct work_struct *work)
3145 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3146 struct se_device *dev = cmd->se_dev;
3147 struct se_tmr_req *tmr = cmd->se_tmr_req;
3148 unsigned long flags;
3151 spin_lock_irqsave(&cmd->t_state_lock, flags);
3152 if (cmd->transport_state & CMD_T_ABORTED) {
3153 tmr->response = TMR_FUNCTION_REJECTED;
3154 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3157 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3159 switch (tmr->function) {
3160 case TMR_ABORT_TASK:
3161 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3163 case TMR_ABORT_TASK_SET:
3165 case TMR_CLEAR_TASK_SET:
3166 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3169 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3170 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3171 TMR_FUNCTION_REJECTED;
3172 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3173 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3174 cmd->orig_fe_lun, 0x29,
3175 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3178 case TMR_TARGET_WARM_RESET:
3179 tmr->response = TMR_FUNCTION_REJECTED;
3181 case TMR_TARGET_COLD_RESET:
3182 tmr->response = TMR_FUNCTION_REJECTED;
3185 pr_err("Uknown TMR function: 0x%02x.\n",
3187 tmr->response = TMR_FUNCTION_REJECTED;
3191 spin_lock_irqsave(&cmd->t_state_lock, flags);
3192 if (cmd->transport_state & CMD_T_ABORTED) {
3193 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3196 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3198 cmd->se_tfo->queue_tm_rsp(cmd);
3201 transport_cmd_check_stop_to_fabric(cmd);
3204 int transport_generic_handle_tmr(
3207 unsigned long flags;
3208 bool aborted = false;
3210 spin_lock_irqsave(&cmd->t_state_lock, flags);
3211 if (cmd->transport_state & CMD_T_ABORTED) {
3214 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3215 cmd->transport_state |= CMD_T_ACTIVE;
3217 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3220 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
3221 "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
3222 cmd->se_tmr_req->ref_task_tag, cmd->tag);
3223 transport_cmd_check_stop_to_fabric(cmd);
3227 INIT_WORK(&cmd->work, target_tmr_work);
3228 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3231 EXPORT_SYMBOL(transport_generic_handle_tmr);
3234 target_check_wce(struct se_device *dev)
3238 if (dev->transport->get_write_cache)
3239 wce = dev->transport->get_write_cache(dev);
3240 else if (dev->dev_attrib.emulate_write_cache > 0)
3247 target_check_fua(struct se_device *dev)
3249 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;