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 void transport_handle_queue_full(struct se_cmd *cmd,
68 struct se_device *dev);
69 static int transport_put_cmd(struct se_cmd *cmd);
70 static void target_complete_ok_work(struct work_struct *work);
72 int init_se_kmem_caches(void)
74 se_sess_cache = kmem_cache_create("se_sess_cache",
75 sizeof(struct se_session), __alignof__(struct se_session),
78 pr_err("kmem_cache_create() for struct se_session"
82 se_ua_cache = kmem_cache_create("se_ua_cache",
83 sizeof(struct se_ua), __alignof__(struct se_ua),
86 pr_err("kmem_cache_create() for struct se_ua failed\n");
87 goto out_free_sess_cache;
89 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
90 sizeof(struct t10_pr_registration),
91 __alignof__(struct t10_pr_registration), 0, NULL);
92 if (!t10_pr_reg_cache) {
93 pr_err("kmem_cache_create() for struct t10_pr_registration"
95 goto out_free_ua_cache;
97 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
98 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
100 if (!t10_alua_lu_gp_cache) {
101 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
103 goto out_free_pr_reg_cache;
105 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
106 sizeof(struct t10_alua_lu_gp_member),
107 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
108 if (!t10_alua_lu_gp_mem_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
111 goto out_free_lu_gp_cache;
113 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
114 sizeof(struct t10_alua_tg_pt_gp),
115 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
116 if (!t10_alua_tg_pt_gp_cache) {
117 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
119 goto out_free_lu_gp_mem_cache;
121 t10_alua_lba_map_cache = kmem_cache_create(
122 "t10_alua_lba_map_cache",
123 sizeof(struct t10_alua_lba_map),
124 __alignof__(struct t10_alua_lba_map), 0, NULL);
125 if (!t10_alua_lba_map_cache) {
126 pr_err("kmem_cache_create() for t10_alua_lba_map_"
128 goto out_free_tg_pt_gp_cache;
130 t10_alua_lba_map_mem_cache = kmem_cache_create(
131 "t10_alua_lba_map_mem_cache",
132 sizeof(struct t10_alua_lba_map_member),
133 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
134 if (!t10_alua_lba_map_mem_cache) {
135 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
137 goto out_free_lba_map_cache;
140 target_completion_wq = alloc_workqueue("target_completion",
142 if (!target_completion_wq)
143 goto out_free_lba_map_mem_cache;
147 out_free_lba_map_mem_cache:
148 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
149 out_free_lba_map_cache:
150 kmem_cache_destroy(t10_alua_lba_map_cache);
151 out_free_tg_pt_gp_cache:
152 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
153 out_free_lu_gp_mem_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
155 out_free_lu_gp_cache:
156 kmem_cache_destroy(t10_alua_lu_gp_cache);
157 out_free_pr_reg_cache:
158 kmem_cache_destroy(t10_pr_reg_cache);
160 kmem_cache_destroy(se_ua_cache);
162 kmem_cache_destroy(se_sess_cache);
167 void release_se_kmem_caches(void)
169 destroy_workqueue(target_completion_wq);
170 kmem_cache_destroy(se_sess_cache);
171 kmem_cache_destroy(se_ua_cache);
172 kmem_cache_destroy(t10_pr_reg_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
176 kmem_cache_destroy(t10_alua_lba_map_cache);
177 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
180 /* This code ensures unique mib indexes are handed out. */
181 static DEFINE_SPINLOCK(scsi_mib_index_lock);
182 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
185 * Allocate a new row index for the entry type specified
187 u32 scsi_get_new_index(scsi_index_t type)
191 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
193 spin_lock(&scsi_mib_index_lock);
194 new_index = ++scsi_mib_index[type];
195 spin_unlock(&scsi_mib_index_lock);
200 void transport_subsystem_check_init(void)
203 static int sub_api_initialized;
205 if (sub_api_initialized)
208 ret = request_module("target_core_iblock");
210 pr_err("Unable to load target_core_iblock\n");
212 ret = request_module("target_core_file");
214 pr_err("Unable to load target_core_file\n");
216 ret = request_module("target_core_pscsi");
218 pr_err("Unable to load target_core_pscsi\n");
220 ret = request_module("target_core_user");
222 pr_err("Unable to load target_core_user\n");
224 sub_api_initialized = 1;
227 struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
229 struct se_session *se_sess;
231 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
233 pr_err("Unable to allocate struct se_session from"
235 return ERR_PTR(-ENOMEM);
237 INIT_LIST_HEAD(&se_sess->sess_list);
238 INIT_LIST_HEAD(&se_sess->sess_acl_list);
239 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
240 INIT_LIST_HEAD(&se_sess->sess_wait_list);
241 spin_lock_init(&se_sess->sess_cmd_lock);
242 se_sess->sup_prot_ops = sup_prot_ops;
246 EXPORT_SYMBOL(transport_init_session);
248 int transport_alloc_session_tags(struct se_session *se_sess,
249 unsigned int tag_num, unsigned int tag_size)
253 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
254 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
255 if (!se_sess->sess_cmd_map) {
256 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
257 if (!se_sess->sess_cmd_map) {
258 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
263 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
265 pr_err("Unable to init se_sess->sess_tag_pool,"
266 " tag_num: %u\n", tag_num);
267 kvfree(se_sess->sess_cmd_map);
268 se_sess->sess_cmd_map = NULL;
274 EXPORT_SYMBOL(transport_alloc_session_tags);
276 struct se_session *transport_init_session_tags(unsigned int tag_num,
277 unsigned int tag_size,
278 enum target_prot_op sup_prot_ops)
280 struct se_session *se_sess;
283 if (tag_num != 0 && !tag_size) {
284 pr_err("init_session_tags called with percpu-ida tag_num:"
285 " %u, but zero tag_size\n", tag_num);
286 return ERR_PTR(-EINVAL);
288 if (!tag_num && tag_size) {
289 pr_err("init_session_tags called with percpu-ida tag_size:"
290 " %u, but zero tag_num\n", tag_size);
291 return ERR_PTR(-EINVAL);
294 se_sess = transport_init_session(sup_prot_ops);
298 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
300 transport_free_session(se_sess);
301 return ERR_PTR(-ENOMEM);
306 EXPORT_SYMBOL(transport_init_session_tags);
309 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
311 void __transport_register_session(
312 struct se_portal_group *se_tpg,
313 struct se_node_acl *se_nacl,
314 struct se_session *se_sess,
315 void *fabric_sess_ptr)
317 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
318 unsigned char buf[PR_REG_ISID_LEN];
320 se_sess->se_tpg = se_tpg;
321 se_sess->fabric_sess_ptr = fabric_sess_ptr;
323 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
325 * Only set for struct se_session's that will actually be moving I/O.
326 * eg: *NOT* discovery sessions.
331 * Determine if fabric allows for T10-PI feature bits exposed to
332 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
334 * If so, then always save prot_type on a per se_node_acl node
335 * basis and re-instate the previous sess_prot_type to avoid
336 * disabling PI from below any previously initiator side
339 if (se_nacl->saved_prot_type)
340 se_sess->sess_prot_type = se_nacl->saved_prot_type;
341 else if (tfo->tpg_check_prot_fabric_only)
342 se_sess->sess_prot_type = se_nacl->saved_prot_type =
343 tfo->tpg_check_prot_fabric_only(se_tpg);
345 * If the fabric module supports an ISID based TransportID,
346 * save this value in binary from the fabric I_T Nexus now.
348 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
349 memset(&buf[0], 0, PR_REG_ISID_LEN);
350 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
351 &buf[0], PR_REG_ISID_LEN);
352 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
355 spin_lock_irq(&se_nacl->nacl_sess_lock);
357 * The se_nacl->nacl_sess pointer will be set to the
358 * last active I_T Nexus for each struct se_node_acl.
360 se_nacl->nacl_sess = se_sess;
362 list_add_tail(&se_sess->sess_acl_list,
363 &se_nacl->acl_sess_list);
364 spin_unlock_irq(&se_nacl->nacl_sess_lock);
366 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
368 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
369 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
371 EXPORT_SYMBOL(__transport_register_session);
373 void transport_register_session(
374 struct se_portal_group *se_tpg,
375 struct se_node_acl *se_nacl,
376 struct se_session *se_sess,
377 void *fabric_sess_ptr)
381 spin_lock_irqsave(&se_tpg->session_lock, flags);
382 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
383 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
385 EXPORT_SYMBOL(transport_register_session);
388 target_alloc_session(struct se_portal_group *tpg,
389 unsigned int tag_num, unsigned int tag_size,
390 enum target_prot_op prot_op,
391 const char *initiatorname, void *private,
392 int (*callback)(struct se_portal_group *,
393 struct se_session *, void *))
395 struct se_session *sess;
398 * If the fabric driver is using percpu-ida based pre allocation
399 * of I/O descriptor tags, go ahead and perform that setup now..
402 sess = transport_init_session_tags(tag_num, tag_size, prot_op);
404 sess = transport_init_session(prot_op);
409 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
410 (unsigned char *)initiatorname);
411 if (!sess->se_node_acl) {
412 transport_free_session(sess);
413 return ERR_PTR(-EACCES);
416 * Go ahead and perform any remaining fabric setup that is
417 * required before transport_register_session().
419 if (callback != NULL) {
420 int rc = callback(tpg, sess, private);
422 transport_free_session(sess);
427 transport_register_session(tpg, sess->se_node_acl, sess, private);
430 EXPORT_SYMBOL(target_alloc_session);
432 ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
434 struct se_session *se_sess;
437 spin_lock_bh(&se_tpg->session_lock);
438 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
439 if (!se_sess->se_node_acl)
441 if (!se_sess->se_node_acl->dynamic_node_acl)
443 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
446 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
447 se_sess->se_node_acl->initiatorname);
448 len += 1; /* Include NULL terminator */
450 spin_unlock_bh(&se_tpg->session_lock);
454 EXPORT_SYMBOL(target_show_dynamic_sessions);
456 static void target_complete_nacl(struct kref *kref)
458 struct se_node_acl *nacl = container_of(kref,
459 struct se_node_acl, acl_kref);
460 struct se_portal_group *se_tpg = nacl->se_tpg;
462 if (!nacl->dynamic_stop) {
463 complete(&nacl->acl_free_comp);
467 mutex_lock(&se_tpg->acl_node_mutex);
468 list_del(&nacl->acl_list);
469 mutex_unlock(&se_tpg->acl_node_mutex);
471 core_tpg_wait_for_nacl_pr_ref(nacl);
472 core_free_device_list_for_node(nacl, se_tpg);
476 void target_put_nacl(struct se_node_acl *nacl)
478 kref_put(&nacl->acl_kref, target_complete_nacl);
480 EXPORT_SYMBOL(target_put_nacl);
482 void transport_deregister_session_configfs(struct se_session *se_sess)
484 struct se_node_acl *se_nacl;
487 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
489 se_nacl = se_sess->se_node_acl;
491 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
492 if (!list_empty(&se_sess->sess_acl_list))
493 list_del_init(&se_sess->sess_acl_list);
495 * If the session list is empty, then clear the pointer.
496 * Otherwise, set the struct se_session pointer from the tail
497 * element of the per struct se_node_acl active session list.
499 if (list_empty(&se_nacl->acl_sess_list))
500 se_nacl->nacl_sess = NULL;
502 se_nacl->nacl_sess = container_of(
503 se_nacl->acl_sess_list.prev,
504 struct se_session, sess_acl_list);
506 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
509 EXPORT_SYMBOL(transport_deregister_session_configfs);
511 void transport_free_session(struct se_session *se_sess)
513 struct se_node_acl *se_nacl = se_sess->se_node_acl;
516 * Drop the se_node_acl->nacl_kref obtained from within
517 * core_tpg_get_initiator_node_acl().
520 struct se_portal_group *se_tpg = se_nacl->se_tpg;
521 const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo;
524 se_sess->se_node_acl = NULL;
527 * Also determine if we need to drop the extra ->cmd_kref if
528 * it had been previously dynamically generated, and
529 * the endpoint is not caching dynamic ACLs.
531 mutex_lock(&se_tpg->acl_node_mutex);
532 if (se_nacl->dynamic_node_acl &&
533 !se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
534 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
535 if (list_empty(&se_nacl->acl_sess_list))
536 se_nacl->dynamic_stop = true;
537 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
539 if (se_nacl->dynamic_stop)
540 list_del(&se_nacl->acl_list);
542 mutex_unlock(&se_tpg->acl_node_mutex);
544 if (se_nacl->dynamic_stop)
545 target_put_nacl(se_nacl);
547 target_put_nacl(se_nacl);
549 if (se_sess->sess_cmd_map) {
550 percpu_ida_destroy(&se_sess->sess_tag_pool);
551 kvfree(se_sess->sess_cmd_map);
553 kmem_cache_free(se_sess_cache, se_sess);
555 EXPORT_SYMBOL(transport_free_session);
557 void transport_deregister_session(struct se_session *se_sess)
559 struct se_portal_group *se_tpg = se_sess->se_tpg;
563 transport_free_session(se_sess);
567 spin_lock_irqsave(&se_tpg->session_lock, flags);
568 list_del(&se_sess->sess_list);
569 se_sess->se_tpg = NULL;
570 se_sess->fabric_sess_ptr = NULL;
571 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
573 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
574 se_tpg->se_tpg_tfo->get_fabric_name());
576 * If last kref is dropping now for an explicit NodeACL, awake sleeping
577 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
578 * removal context from within transport_free_session() code.
580 * For dynamic ACL, target_put_nacl() uses target_complete_nacl()
581 * to release all remaining generate_node_acl=1 created ACL resources.
584 transport_free_session(se_sess);
586 EXPORT_SYMBOL(transport_deregister_session);
588 static void target_remove_from_state_list(struct se_cmd *cmd)
590 struct se_device *dev = cmd->se_dev;
596 if (cmd->transport_state & CMD_T_BUSY)
599 spin_lock_irqsave(&dev->execute_task_lock, flags);
600 if (cmd->state_active) {
601 list_del(&cmd->state_list);
602 cmd->state_active = false;
604 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
607 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
612 if (remove_from_lists) {
613 target_remove_from_state_list(cmd);
616 * Clear struct se_cmd->se_lun before the handoff to FE.
621 spin_lock_irqsave(&cmd->t_state_lock, flags);
623 cmd->t_state = TRANSPORT_WRITE_PENDING;
626 * Determine if frontend context caller is requesting the stopping of
627 * this command for frontend exceptions.
629 if (cmd->transport_state & CMD_T_STOP) {
630 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
631 __func__, __LINE__, cmd->tag);
633 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
635 complete_all(&cmd->t_transport_stop_comp);
639 cmd->transport_state &= ~CMD_T_ACTIVE;
640 if (remove_from_lists) {
642 * Some fabric modules like tcm_loop can release
643 * their internally allocated I/O reference now and
646 * Fabric modules are expected to return '1' here if the
647 * se_cmd being passed is released at this point,
648 * or zero if not being released.
650 if (cmd->se_tfo->check_stop_free != NULL) {
651 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
652 return cmd->se_tfo->check_stop_free(cmd);
656 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
660 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
662 return transport_cmd_check_stop(cmd, true, false);
665 static void transport_lun_remove_cmd(struct se_cmd *cmd)
667 struct se_lun *lun = cmd->se_lun;
672 if (cmpxchg(&cmd->lun_ref_active, true, false))
673 percpu_ref_put(&lun->lun_ref);
676 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
678 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
680 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
681 transport_lun_remove_cmd(cmd);
683 * Allow the fabric driver to unmap any resources before
684 * releasing the descriptor via TFO->release_cmd()
687 cmd->se_tfo->aborted_task(cmd);
689 if (transport_cmd_check_stop_to_fabric(cmd))
691 if (remove && ack_kref)
692 transport_put_cmd(cmd);
695 static void target_complete_failure_work(struct work_struct *work)
697 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
699 transport_generic_request_failure(cmd,
700 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
704 * Used when asking transport to copy Sense Data from the underlying
705 * Linux/SCSI struct scsi_cmnd
707 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
709 struct se_device *dev = cmd->se_dev;
711 WARN_ON(!cmd->se_lun);
716 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
719 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
721 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
722 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
723 return cmd->sense_buffer;
726 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
728 struct se_device *dev = cmd->se_dev;
729 int success = scsi_status == GOOD;
732 cmd->scsi_status = scsi_status;
735 spin_lock_irqsave(&cmd->t_state_lock, flags);
736 cmd->transport_state &= ~CMD_T_BUSY;
738 if (dev && dev->transport->transport_complete) {
739 dev->transport->transport_complete(cmd,
741 transport_get_sense_buffer(cmd));
742 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
747 * Check for case where an explicit ABORT_TASK has been received
748 * and transport_wait_for_tasks() will be waiting for completion..
750 if (cmd->transport_state & CMD_T_ABORTED ||
751 cmd->transport_state & CMD_T_STOP) {
752 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
753 complete_all(&cmd->t_transport_stop_comp);
755 } else if (!success) {
756 INIT_WORK(&cmd->work, target_complete_failure_work);
758 INIT_WORK(&cmd->work, target_complete_ok_work);
761 cmd->t_state = TRANSPORT_COMPLETE;
762 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
763 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
765 if (cmd->se_cmd_flags & SCF_USE_CPUID)
766 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
768 queue_work(target_completion_wq, &cmd->work);
770 EXPORT_SYMBOL(target_complete_cmd);
772 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
774 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
775 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
776 cmd->residual_count += cmd->data_length - length;
778 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
779 cmd->residual_count = cmd->data_length - length;
782 cmd->data_length = length;
785 target_complete_cmd(cmd, scsi_status);
787 EXPORT_SYMBOL(target_complete_cmd_with_length);
789 static void target_add_to_state_list(struct se_cmd *cmd)
791 struct se_device *dev = cmd->se_dev;
794 spin_lock_irqsave(&dev->execute_task_lock, flags);
795 if (!cmd->state_active) {
796 list_add_tail(&cmd->state_list, &dev->state_list);
797 cmd->state_active = true;
799 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
803 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
805 static void transport_write_pending_qf(struct se_cmd *cmd);
806 static void transport_complete_qf(struct se_cmd *cmd);
808 void target_qf_do_work(struct work_struct *work)
810 struct se_device *dev = container_of(work, struct se_device,
812 LIST_HEAD(qf_cmd_list);
813 struct se_cmd *cmd, *cmd_tmp;
815 spin_lock_irq(&dev->qf_cmd_lock);
816 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
817 spin_unlock_irq(&dev->qf_cmd_lock);
819 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
820 list_del(&cmd->se_qf_node);
821 atomic_dec_mb(&dev->dev_qf_count);
823 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
824 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
825 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
826 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
829 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
830 transport_write_pending_qf(cmd);
831 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
832 transport_complete_qf(cmd);
836 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
838 switch (cmd->data_direction) {
841 case DMA_FROM_DEVICE:
845 case DMA_BIDIRECTIONAL:
854 void transport_dump_dev_state(
855 struct se_device *dev,
859 *bl += sprintf(b + *bl, "Status: ");
860 if (dev->export_count)
861 *bl += sprintf(b + *bl, "ACTIVATED");
863 *bl += sprintf(b + *bl, "DEACTIVATED");
865 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
866 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
867 dev->dev_attrib.block_size,
868 dev->dev_attrib.hw_max_sectors);
869 *bl += sprintf(b + *bl, " ");
872 void transport_dump_vpd_proto_id(
874 unsigned char *p_buf,
877 unsigned char buf[VPD_TMP_BUF_SIZE];
880 memset(buf, 0, VPD_TMP_BUF_SIZE);
881 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
883 switch (vpd->protocol_identifier) {
885 sprintf(buf+len, "Fibre Channel\n");
888 sprintf(buf+len, "Parallel SCSI\n");
891 sprintf(buf+len, "SSA\n");
894 sprintf(buf+len, "IEEE 1394\n");
897 sprintf(buf+len, "SCSI Remote Direct Memory Access"
901 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
904 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
907 sprintf(buf+len, "Automation/Drive Interface Transport"
911 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
914 sprintf(buf+len, "Unknown 0x%02x\n",
915 vpd->protocol_identifier);
920 strncpy(p_buf, buf, p_buf_len);
926 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
929 * Check if the Protocol Identifier Valid (PIV) bit is set..
931 * from spc3r23.pdf section 7.5.1
933 if (page_83[1] & 0x80) {
934 vpd->protocol_identifier = (page_83[0] & 0xf0);
935 vpd->protocol_identifier_set = 1;
936 transport_dump_vpd_proto_id(vpd, NULL, 0);
939 EXPORT_SYMBOL(transport_set_vpd_proto_id);
941 int transport_dump_vpd_assoc(
943 unsigned char *p_buf,
946 unsigned char buf[VPD_TMP_BUF_SIZE];
950 memset(buf, 0, VPD_TMP_BUF_SIZE);
951 len = sprintf(buf, "T10 VPD Identifier Association: ");
953 switch (vpd->association) {
955 sprintf(buf+len, "addressed logical unit\n");
958 sprintf(buf+len, "target port\n");
961 sprintf(buf+len, "SCSI target device\n");
964 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
970 strncpy(p_buf, buf, p_buf_len);
977 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
980 * The VPD identification association..
982 * from spc3r23.pdf Section 7.6.3.1 Table 297
984 vpd->association = (page_83[1] & 0x30);
985 return transport_dump_vpd_assoc(vpd, NULL, 0);
987 EXPORT_SYMBOL(transport_set_vpd_assoc);
989 int transport_dump_vpd_ident_type(
991 unsigned char *p_buf,
994 unsigned char buf[VPD_TMP_BUF_SIZE];
998 memset(buf, 0, VPD_TMP_BUF_SIZE);
999 len = sprintf(buf, "T10 VPD Identifier Type: ");
1001 switch (vpd->device_identifier_type) {
1003 sprintf(buf+len, "Vendor specific\n");
1006 sprintf(buf+len, "T10 Vendor ID based\n");
1009 sprintf(buf+len, "EUI-64 based\n");
1012 sprintf(buf+len, "NAA\n");
1015 sprintf(buf+len, "Relative target port identifier\n");
1018 sprintf(buf+len, "SCSI name string\n");
1021 sprintf(buf+len, "Unsupported: 0x%02x\n",
1022 vpd->device_identifier_type);
1028 if (p_buf_len < strlen(buf)+1)
1030 strncpy(p_buf, buf, p_buf_len);
1032 pr_debug("%s", buf);
1038 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1041 * The VPD identifier type..
1043 * from spc3r23.pdf Section 7.6.3.1 Table 298
1045 vpd->device_identifier_type = (page_83[1] & 0x0f);
1046 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1048 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1050 int transport_dump_vpd_ident(
1051 struct t10_vpd *vpd,
1052 unsigned char *p_buf,
1055 unsigned char buf[VPD_TMP_BUF_SIZE];
1058 memset(buf, 0, VPD_TMP_BUF_SIZE);
1060 switch (vpd->device_identifier_code_set) {
1061 case 0x01: /* Binary */
1062 snprintf(buf, sizeof(buf),
1063 "T10 VPD Binary Device Identifier: %s\n",
1064 &vpd->device_identifier[0]);
1066 case 0x02: /* ASCII */
1067 snprintf(buf, sizeof(buf),
1068 "T10 VPD ASCII Device Identifier: %s\n",
1069 &vpd->device_identifier[0]);
1071 case 0x03: /* UTF-8 */
1072 snprintf(buf, sizeof(buf),
1073 "T10 VPD UTF-8 Device Identifier: %s\n",
1074 &vpd->device_identifier[0]);
1077 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1078 " 0x%02x", vpd->device_identifier_code_set);
1084 strncpy(p_buf, buf, p_buf_len);
1086 pr_debug("%s", buf);
1092 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1094 static const char hex_str[] = "0123456789abcdef";
1095 int j = 0, i = 4; /* offset to start of the identifier */
1098 * The VPD Code Set (encoding)
1100 * from spc3r23.pdf Section 7.6.3.1 Table 296
1102 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1103 switch (vpd->device_identifier_code_set) {
1104 case 0x01: /* Binary */
1105 vpd->device_identifier[j++] =
1106 hex_str[vpd->device_identifier_type];
1107 while (i < (4 + page_83[3])) {
1108 vpd->device_identifier[j++] =
1109 hex_str[(page_83[i] & 0xf0) >> 4];
1110 vpd->device_identifier[j++] =
1111 hex_str[page_83[i] & 0x0f];
1115 case 0x02: /* ASCII */
1116 case 0x03: /* UTF-8 */
1117 while (i < (4 + page_83[3]))
1118 vpd->device_identifier[j++] = page_83[i++];
1124 return transport_dump_vpd_ident(vpd, NULL, 0);
1126 EXPORT_SYMBOL(transport_set_vpd_ident);
1128 static sense_reason_t
1129 target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1134 if (!cmd->se_tfo->max_data_sg_nents)
1135 return TCM_NO_SENSE;
1137 * Check if fabric enforced maximum SGL entries per I/O descriptor
1138 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1139 * residual_count and reduce original cmd->data_length to maximum
1140 * length based on single PAGE_SIZE entry scatter-lists.
1142 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1143 if (cmd->data_length > mtl) {
1145 * If an existing CDB overflow is present, calculate new residual
1146 * based on CDB size minus fabric maximum transfer length.
1148 * If an existing CDB underflow is present, calculate new residual
1149 * based on original cmd->data_length minus fabric maximum transfer
1152 * Otherwise, set the underflow residual based on cmd->data_length
1153 * minus fabric maximum transfer length.
1155 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1156 cmd->residual_count = (size - mtl);
1157 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1158 u32 orig_dl = size + cmd->residual_count;
1159 cmd->residual_count = (orig_dl - mtl);
1161 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1162 cmd->residual_count = (cmd->data_length - mtl);
1164 cmd->data_length = mtl;
1166 * Reset sbc_check_prot() calculated protection payload
1167 * length based upon the new smaller MTL.
1169 if (cmd->prot_length) {
1170 u32 sectors = (mtl / dev->dev_attrib.block_size);
1171 cmd->prot_length = dev->prot_length * sectors;
1174 return TCM_NO_SENSE;
1178 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1180 struct se_device *dev = cmd->se_dev;
1182 if (cmd->unknown_data_length) {
1183 cmd->data_length = size;
1184 } else if (size != cmd->data_length) {
1185 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1186 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1187 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1188 cmd->data_length, size, cmd->t_task_cdb[0]);
1190 if (cmd->data_direction == DMA_TO_DEVICE &&
1191 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1192 pr_err("Rejecting underflow/overflow WRITE data\n");
1193 return TCM_INVALID_CDB_FIELD;
1196 * Reject READ_* or WRITE_* with overflow/underflow for
1197 * type SCF_SCSI_DATA_CDB.
1199 if (dev->dev_attrib.block_size != 512) {
1200 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1201 " CDB on non 512-byte sector setup subsystem"
1202 " plugin: %s\n", dev->transport->name);
1203 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1204 return TCM_INVALID_CDB_FIELD;
1207 * For the overflow case keep the existing fabric provided
1208 * ->data_length. Otherwise for the underflow case, reset
1209 * ->data_length to the smaller SCSI expected data transfer
1212 if (size > cmd->data_length) {
1213 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1214 cmd->residual_count = (size - cmd->data_length);
1216 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1217 cmd->residual_count = (cmd->data_length - size);
1218 cmd->data_length = size;
1222 return target_check_max_data_sg_nents(cmd, dev, size);
1227 * Used by fabric modules containing a local struct se_cmd within their
1228 * fabric dependent per I/O descriptor.
1230 * Preserves the value of @cmd->tag.
1232 void transport_init_se_cmd(
1234 const struct target_core_fabric_ops *tfo,
1235 struct se_session *se_sess,
1239 unsigned char *sense_buffer)
1241 INIT_LIST_HEAD(&cmd->se_delayed_node);
1242 INIT_LIST_HEAD(&cmd->se_qf_node);
1243 INIT_LIST_HEAD(&cmd->se_cmd_list);
1244 INIT_LIST_HEAD(&cmd->state_list);
1245 init_completion(&cmd->t_transport_stop_comp);
1246 init_completion(&cmd->cmd_wait_comp);
1247 spin_lock_init(&cmd->t_state_lock);
1248 kref_init(&cmd->cmd_kref);
1249 cmd->transport_state = CMD_T_DEV_ACTIVE;
1252 cmd->se_sess = se_sess;
1253 cmd->data_length = data_length;
1254 cmd->data_direction = data_direction;
1255 cmd->sam_task_attr = task_attr;
1256 cmd->sense_buffer = sense_buffer;
1258 cmd->state_active = false;
1260 EXPORT_SYMBOL(transport_init_se_cmd);
1262 static sense_reason_t
1263 transport_check_alloc_task_attr(struct se_cmd *cmd)
1265 struct se_device *dev = cmd->se_dev;
1268 * Check if SAM Task Attribute emulation is enabled for this
1269 * struct se_device storage object
1271 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1274 if (cmd->sam_task_attr == TCM_ACA_TAG) {
1275 pr_debug("SAM Task Attribute ACA"
1276 " emulation is not supported\n");
1277 return TCM_INVALID_CDB_FIELD;
1284 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1286 struct se_device *dev = cmd->se_dev;
1290 * Ensure that the received CDB is less than the max (252 + 8) bytes
1291 * for VARIABLE_LENGTH_CMD
1293 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1294 pr_err("Received SCSI CDB with command_size: %d that"
1295 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1296 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1297 return TCM_INVALID_CDB_FIELD;
1300 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1301 * allocate the additional extended CDB buffer now.. Otherwise
1302 * setup the pointer from __t_task_cdb to t_task_cdb.
1304 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1305 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1307 if (!cmd->t_task_cdb) {
1308 pr_err("Unable to allocate cmd->t_task_cdb"
1309 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1310 scsi_command_size(cdb),
1311 (unsigned long)sizeof(cmd->__t_task_cdb));
1312 return TCM_OUT_OF_RESOURCES;
1315 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1317 * Copy the original CDB into cmd->
1319 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1321 trace_target_sequencer_start(cmd);
1323 ret = dev->transport->parse_cdb(cmd);
1324 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1325 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1326 cmd->se_tfo->get_fabric_name(),
1327 cmd->se_sess->se_node_acl->initiatorname,
1328 cmd->t_task_cdb[0]);
1332 ret = transport_check_alloc_task_attr(cmd);
1336 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1337 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
1340 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1343 * Used by fabric module frontends to queue tasks directly.
1344 * May only be used from process context.
1346 int transport_handle_cdb_direct(
1353 pr_err("cmd->se_lun is NULL\n");
1356 if (in_interrupt()) {
1358 pr_err("transport_generic_handle_cdb cannot be called"
1359 " from interrupt context\n");
1363 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1364 * outstanding descriptors are handled correctly during shutdown via
1365 * transport_wait_for_tasks()
1367 * Also, we don't take cmd->t_state_lock here as we only expect
1368 * this to be called for initial descriptor submission.
1370 cmd->t_state = TRANSPORT_NEW_CMD;
1371 cmd->transport_state |= CMD_T_ACTIVE;
1374 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1375 * so follow TRANSPORT_NEW_CMD processing thread context usage
1376 * and call transport_generic_request_failure() if necessary..
1378 ret = transport_generic_new_cmd(cmd);
1380 transport_generic_request_failure(cmd, ret);
1383 EXPORT_SYMBOL(transport_handle_cdb_direct);
1386 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1387 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1389 if (!sgl || !sgl_count)
1393 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1394 * scatterlists already have been set to follow what the fabric
1395 * passes for the original expected data transfer length.
1397 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1398 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1399 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1400 return TCM_INVALID_CDB_FIELD;
1403 cmd->t_data_sg = sgl;
1404 cmd->t_data_nents = sgl_count;
1405 cmd->t_bidi_data_sg = sgl_bidi;
1406 cmd->t_bidi_data_nents = sgl_bidi_count;
1408 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1413 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1414 * se_cmd + use pre-allocated SGL memory.
1416 * @se_cmd: command descriptor to submit
1417 * @se_sess: associated se_sess for endpoint
1418 * @cdb: pointer to SCSI CDB
1419 * @sense: pointer to SCSI sense buffer
1420 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1421 * @data_length: fabric expected data transfer length
1422 * @task_addr: SAM task attribute
1423 * @data_dir: DMA data direction
1424 * @flags: flags for command submission from target_sc_flags_tables
1425 * @sgl: struct scatterlist memory for unidirectional mapping
1426 * @sgl_count: scatterlist count for unidirectional mapping
1427 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1428 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1429 * @sgl_prot: struct scatterlist memory protection information
1430 * @sgl_prot_count: scatterlist count for protection information
1432 * Task tags are supported if the caller has set @se_cmd->tag.
1434 * Returns non zero to signal active I/O shutdown failure. All other
1435 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1436 * but still return zero here.
1438 * This may only be called from process context, and also currently
1439 * assumes internal allocation of fabric payload buffer by target-core.
1441 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1442 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1443 u32 data_length, int task_attr, int data_dir, int flags,
1444 struct scatterlist *sgl, u32 sgl_count,
1445 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1446 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1448 struct se_portal_group *se_tpg;
1452 se_tpg = se_sess->se_tpg;
1454 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1455 BUG_ON(in_interrupt());
1457 * Initialize se_cmd for target operation. From this point
1458 * exceptions are handled by sending exception status via
1459 * target_core_fabric_ops->queue_status() callback
1461 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1462 data_length, data_dir, task_attr, sense);
1464 if (flags & TARGET_SCF_USE_CPUID)
1465 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1467 se_cmd->cpuid = WORK_CPU_UNBOUND;
1469 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1470 se_cmd->unknown_data_length = 1;
1472 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1473 * se_sess->sess_cmd_list. A second kref_get here is necessary
1474 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1475 * kref_put() to happen during fabric packet acknowledgement.
1477 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1481 * Signal bidirectional data payloads to target-core
1483 if (flags & TARGET_SCF_BIDI_OP)
1484 se_cmd->se_cmd_flags |= SCF_BIDI;
1486 * Locate se_lun pointer and attach it to struct se_cmd
1488 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1490 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1491 target_put_sess_cmd(se_cmd);
1495 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1497 transport_generic_request_failure(se_cmd, rc);
1502 * Save pointers for SGLs containing protection information,
1505 if (sgl_prot_count) {
1506 se_cmd->t_prot_sg = sgl_prot;
1507 se_cmd->t_prot_nents = sgl_prot_count;
1508 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
1512 * When a non zero sgl_count has been passed perform SGL passthrough
1513 * mapping for pre-allocated fabric memory instead of having target
1514 * core perform an internal SGL allocation..
1516 if (sgl_count != 0) {
1520 * A work-around for tcm_loop as some userspace code via
1521 * scsi-generic do not memset their associated read buffers,
1522 * so go ahead and do that here for type non-data CDBs. Also
1523 * note that this is currently guaranteed to be a single SGL
1524 * for this case by target core in target_setup_cmd_from_cdb()
1525 * -> transport_generic_cmd_sequencer().
1527 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1528 se_cmd->data_direction == DMA_FROM_DEVICE) {
1529 unsigned char *buf = NULL;
1532 buf = kmap(sg_page(sgl)) + sgl->offset;
1535 memset(buf, 0, sgl->length);
1536 kunmap(sg_page(sgl));
1540 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1541 sgl_bidi, sgl_bidi_count);
1543 transport_generic_request_failure(se_cmd, rc);
1549 * Check if we need to delay processing because of ALUA
1550 * Active/NonOptimized primary access state..
1552 core_alua_check_nonop_delay(se_cmd);
1554 transport_handle_cdb_direct(se_cmd);
1557 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1560 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1562 * @se_cmd: command descriptor to submit
1563 * @se_sess: associated se_sess for endpoint
1564 * @cdb: pointer to SCSI CDB
1565 * @sense: pointer to SCSI sense buffer
1566 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1567 * @data_length: fabric expected data transfer length
1568 * @task_addr: SAM task attribute
1569 * @data_dir: DMA data direction
1570 * @flags: flags for command submission from target_sc_flags_tables
1572 * Task tags are supported if the caller has set @se_cmd->tag.
1574 * Returns non zero to signal active I/O shutdown failure. All other
1575 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1576 * but still return zero here.
1578 * This may only be called from process context, and also currently
1579 * assumes internal allocation of fabric payload buffer by target-core.
1581 * It also assumes interal target core SGL memory allocation.
1583 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1584 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1585 u32 data_length, int task_attr, int data_dir, int flags)
1587 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1588 unpacked_lun, data_length, task_attr, data_dir,
1589 flags, NULL, 0, NULL, 0, NULL, 0);
1591 EXPORT_SYMBOL(target_submit_cmd);
1593 static void target_complete_tmr_failure(struct work_struct *work)
1595 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1597 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1598 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1600 transport_cmd_check_stop_to_fabric(se_cmd);
1604 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1607 * @se_cmd: command descriptor to submit
1608 * @se_sess: associated se_sess for endpoint
1609 * @sense: pointer to SCSI sense buffer
1610 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1611 * @fabric_context: fabric context for TMR req
1612 * @tm_type: Type of TM request
1613 * @gfp: gfp type for caller
1614 * @tag: referenced task tag for TMR_ABORT_TASK
1615 * @flags: submit cmd flags
1617 * Callable from all contexts.
1620 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1621 unsigned char *sense, u64 unpacked_lun,
1622 void *fabric_tmr_ptr, unsigned char tm_type,
1623 gfp_t gfp, u64 tag, int flags)
1625 struct se_portal_group *se_tpg;
1628 se_tpg = se_sess->se_tpg;
1631 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1632 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
1634 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1635 * allocation failure.
1637 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1641 if (tm_type == TMR_ABORT_TASK)
1642 se_cmd->se_tmr_req->ref_task_tag = tag;
1644 /* See target_submit_cmd for commentary */
1645 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1647 core_tmr_release_req(se_cmd->se_tmr_req);
1651 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1654 * For callback during failure handling, push this work off
1655 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1657 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1658 schedule_work(&se_cmd->work);
1661 transport_generic_handle_tmr(se_cmd);
1664 EXPORT_SYMBOL(target_submit_tmr);
1667 * Handle SAM-esque emulation for generic transport request failures.
1669 void transport_generic_request_failure(struct se_cmd *cmd,
1670 sense_reason_t sense_reason)
1672 int ret = 0, post_ret = 0;
1674 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1675 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
1676 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1677 cmd->se_tfo->get_cmd_state(cmd),
1678 cmd->t_state, sense_reason);
1679 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1680 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1681 (cmd->transport_state & CMD_T_STOP) != 0,
1682 (cmd->transport_state & CMD_T_SENT) != 0);
1685 * For SAM Task Attribute emulation for failed struct se_cmd
1687 transport_complete_task_attr(cmd);
1689 * Handle special case for COMPARE_AND_WRITE failure, where the
1690 * callback is expected to drop the per device ->caw_sem.
1692 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1693 cmd->transport_complete_callback)
1694 cmd->transport_complete_callback(cmd, false, &post_ret);
1696 switch (sense_reason) {
1697 case TCM_NON_EXISTENT_LUN:
1698 case TCM_UNSUPPORTED_SCSI_OPCODE:
1699 case TCM_INVALID_CDB_FIELD:
1700 case TCM_INVALID_PARAMETER_LIST:
1701 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1702 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1703 case TCM_UNKNOWN_MODE_PAGE:
1704 case TCM_WRITE_PROTECTED:
1705 case TCM_ADDRESS_OUT_OF_RANGE:
1706 case TCM_CHECK_CONDITION_ABORT_CMD:
1707 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1708 case TCM_CHECK_CONDITION_NOT_READY:
1709 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1710 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1711 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1712 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
1713 case TCM_TOO_MANY_TARGET_DESCS:
1714 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE:
1715 case TCM_TOO_MANY_SEGMENT_DESCS:
1716 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE:
1718 case TCM_OUT_OF_RESOURCES:
1719 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1721 case TCM_RESERVATION_CONFLICT:
1723 * No SENSE Data payload for this case, set SCSI Status
1724 * and queue the response to $FABRIC_MOD.
1726 * Uses linux/include/scsi/scsi.h SAM status codes defs
1728 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1730 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1731 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1734 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1737 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1738 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1739 cmd->orig_fe_lun, 0x2C,
1740 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1742 trace_target_cmd_complete(cmd);
1743 ret = cmd->se_tfo->queue_status(cmd);
1744 if (ret == -EAGAIN || ret == -ENOMEM)
1748 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1749 cmd->t_task_cdb[0], sense_reason);
1750 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1754 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1755 if (ret == -EAGAIN || ret == -ENOMEM)
1759 transport_lun_remove_cmd(cmd);
1760 transport_cmd_check_stop_to_fabric(cmd);
1764 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1765 transport_handle_queue_full(cmd, cmd->se_dev);
1767 EXPORT_SYMBOL(transport_generic_request_failure);
1769 void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
1773 if (!cmd->execute_cmd) {
1774 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1779 * Check for an existing UNIT ATTENTION condition after
1780 * target_handle_task_attr() has done SAM task attr
1781 * checking, and possibly have already defered execution
1782 * out to target_restart_delayed_cmds() context.
1784 ret = target_scsi3_ua_check(cmd);
1788 ret = target_alua_state_check(cmd);
1792 ret = target_check_reservation(cmd);
1794 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1799 ret = cmd->execute_cmd(cmd);
1803 spin_lock_irq(&cmd->t_state_lock);
1804 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1805 spin_unlock_irq(&cmd->t_state_lock);
1807 transport_generic_request_failure(cmd, ret);
1810 static int target_write_prot_action(struct se_cmd *cmd)
1814 * Perform WRITE_INSERT of PI using software emulation when backend
1815 * device has PI enabled, if the transport has not already generated
1816 * PI using hardware WRITE_INSERT offload.
1818 switch (cmd->prot_op) {
1819 case TARGET_PROT_DOUT_INSERT:
1820 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1821 sbc_dif_generate(cmd);
1823 case TARGET_PROT_DOUT_STRIP:
1824 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1827 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
1828 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1829 sectors, 0, cmd->t_prot_sg, 0);
1830 if (unlikely(cmd->pi_err)) {
1831 spin_lock_irq(&cmd->t_state_lock);
1832 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1833 spin_unlock_irq(&cmd->t_state_lock);
1834 transport_generic_request_failure(cmd, cmd->pi_err);
1845 static bool target_handle_task_attr(struct se_cmd *cmd)
1847 struct se_device *dev = cmd->se_dev;
1849 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1852 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1855 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1856 * to allow the passed struct se_cmd list of tasks to the front of the list.
1858 switch (cmd->sam_task_attr) {
1860 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1861 cmd->t_task_cdb[0]);
1863 case TCM_ORDERED_TAG:
1864 atomic_inc_mb(&dev->dev_ordered_sync);
1866 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1867 cmd->t_task_cdb[0]);
1870 * Execute an ORDERED command if no other older commands
1871 * exist that need to be completed first.
1873 if (!atomic_read(&dev->simple_cmds))
1878 * For SIMPLE and UNTAGGED Task Attribute commands
1880 atomic_inc_mb(&dev->simple_cmds);
1884 if (atomic_read(&dev->dev_ordered_sync) == 0)
1887 spin_lock(&dev->delayed_cmd_lock);
1888 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1889 spin_unlock(&dev->delayed_cmd_lock);
1891 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1892 cmd->t_task_cdb[0], cmd->sam_task_attr);
1896 static int __transport_check_aborted_status(struct se_cmd *, int);
1898 void target_execute_cmd(struct se_cmd *cmd)
1901 * Determine if frontend context caller is requesting the stopping of
1902 * this command for frontend exceptions.
1904 * If the received CDB has aleady been aborted stop processing it here.
1906 spin_lock_irq(&cmd->t_state_lock);
1907 if (__transport_check_aborted_status(cmd, 1)) {
1908 spin_unlock_irq(&cmd->t_state_lock);
1911 if (cmd->transport_state & CMD_T_STOP) {
1912 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1913 __func__, __LINE__, cmd->tag);
1915 spin_unlock_irq(&cmd->t_state_lock);
1916 complete_all(&cmd->t_transport_stop_comp);
1920 cmd->t_state = TRANSPORT_PROCESSING;
1921 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1922 spin_unlock_irq(&cmd->t_state_lock);
1924 if (target_write_prot_action(cmd))
1927 if (target_handle_task_attr(cmd)) {
1928 spin_lock_irq(&cmd->t_state_lock);
1929 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1930 spin_unlock_irq(&cmd->t_state_lock);
1934 __target_execute_cmd(cmd, true);
1936 EXPORT_SYMBOL(target_execute_cmd);
1939 * Process all commands up to the last received ORDERED task attribute which
1940 * requires another blocking boundary
1942 static void target_restart_delayed_cmds(struct se_device *dev)
1947 spin_lock(&dev->delayed_cmd_lock);
1948 if (list_empty(&dev->delayed_cmd_list)) {
1949 spin_unlock(&dev->delayed_cmd_lock);
1953 cmd = list_entry(dev->delayed_cmd_list.next,
1954 struct se_cmd, se_delayed_node);
1955 list_del(&cmd->se_delayed_node);
1956 spin_unlock(&dev->delayed_cmd_lock);
1958 __target_execute_cmd(cmd, true);
1960 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
1966 * Called from I/O completion to determine which dormant/delayed
1967 * and ordered cmds need to have their tasks added to the execution queue.
1969 static void transport_complete_task_attr(struct se_cmd *cmd)
1971 struct se_device *dev = cmd->se_dev;
1973 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1976 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
1979 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
1980 atomic_dec_mb(&dev->simple_cmds);
1981 dev->dev_cur_ordered_id++;
1982 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1983 dev->dev_cur_ordered_id);
1984 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
1985 dev->dev_cur_ordered_id++;
1986 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1987 dev->dev_cur_ordered_id);
1988 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
1989 atomic_dec_mb(&dev->dev_ordered_sync);
1991 dev->dev_cur_ordered_id++;
1992 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1993 dev->dev_cur_ordered_id);
1996 target_restart_delayed_cmds(dev);
1999 static void transport_complete_qf(struct se_cmd *cmd)
2003 transport_complete_task_attr(cmd);
2005 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2006 trace_target_cmd_complete(cmd);
2007 ret = cmd->se_tfo->queue_status(cmd);
2011 switch (cmd->data_direction) {
2012 case DMA_FROM_DEVICE:
2013 if (cmd->scsi_status)
2016 trace_target_cmd_complete(cmd);
2017 ret = cmd->se_tfo->queue_data_in(cmd);
2020 if (cmd->se_cmd_flags & SCF_BIDI) {
2021 ret = cmd->se_tfo->queue_data_in(cmd);
2024 /* Fall through for DMA_TO_DEVICE */
2027 trace_target_cmd_complete(cmd);
2028 ret = cmd->se_tfo->queue_status(cmd);
2036 transport_handle_queue_full(cmd, cmd->se_dev);
2039 transport_lun_remove_cmd(cmd);
2040 transport_cmd_check_stop_to_fabric(cmd);
2043 static void transport_handle_queue_full(
2045 struct se_device *dev)
2047 spin_lock_irq(&dev->qf_cmd_lock);
2048 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2049 atomic_inc_mb(&dev->dev_qf_count);
2050 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2052 schedule_work(&cmd->se_dev->qf_work_queue);
2055 static bool target_read_prot_action(struct se_cmd *cmd)
2057 switch (cmd->prot_op) {
2058 case TARGET_PROT_DIN_STRIP:
2059 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
2060 u32 sectors = cmd->data_length >>
2061 ilog2(cmd->se_dev->dev_attrib.block_size);
2063 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2064 sectors, 0, cmd->t_prot_sg,
2070 case TARGET_PROT_DIN_INSERT:
2071 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2074 sbc_dif_generate(cmd);
2083 static void target_complete_ok_work(struct work_struct *work)
2085 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2089 * Check if we need to move delayed/dormant tasks from cmds on the
2090 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2093 transport_complete_task_attr(cmd);
2096 * Check to schedule QUEUE_FULL work, or execute an existing
2097 * cmd->transport_qf_callback()
2099 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2100 schedule_work(&cmd->se_dev->qf_work_queue);
2103 * Check if we need to send a sense buffer from
2104 * the struct se_cmd in question.
2106 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2107 WARN_ON(!cmd->scsi_status);
2108 ret = transport_send_check_condition_and_sense(
2110 if (ret == -EAGAIN || ret == -ENOMEM)
2113 transport_lun_remove_cmd(cmd);
2114 transport_cmd_check_stop_to_fabric(cmd);
2118 * Check for a callback, used by amongst other things
2119 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
2121 if (cmd->transport_complete_callback) {
2123 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2124 bool zero_dl = !(cmd->data_length);
2127 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2128 if (!rc && !post_ret) {
2134 ret = transport_send_check_condition_and_sense(cmd,
2136 if (ret == -EAGAIN || ret == -ENOMEM)
2139 transport_lun_remove_cmd(cmd);
2140 transport_cmd_check_stop_to_fabric(cmd);
2146 switch (cmd->data_direction) {
2147 case DMA_FROM_DEVICE:
2148 if (cmd->scsi_status)
2151 atomic_long_add(cmd->data_length,
2152 &cmd->se_lun->lun_stats.tx_data_octets);
2154 * Perform READ_STRIP of PI using software emulation when
2155 * backend had PI enabled, if the transport will not be
2156 * performing hardware READ_STRIP offload.
2158 if (target_read_prot_action(cmd)) {
2159 ret = transport_send_check_condition_and_sense(cmd,
2161 if (ret == -EAGAIN || ret == -ENOMEM)
2164 transport_lun_remove_cmd(cmd);
2165 transport_cmd_check_stop_to_fabric(cmd);
2169 trace_target_cmd_complete(cmd);
2170 ret = cmd->se_tfo->queue_data_in(cmd);
2171 if (ret == -EAGAIN || ret == -ENOMEM)
2175 atomic_long_add(cmd->data_length,
2176 &cmd->se_lun->lun_stats.rx_data_octets);
2178 * Check if we need to send READ payload for BIDI-COMMAND
2180 if (cmd->se_cmd_flags & SCF_BIDI) {
2181 atomic_long_add(cmd->data_length,
2182 &cmd->se_lun->lun_stats.tx_data_octets);
2183 ret = cmd->se_tfo->queue_data_in(cmd);
2184 if (ret == -EAGAIN || ret == -ENOMEM)
2188 /* Fall through for DMA_TO_DEVICE */
2191 trace_target_cmd_complete(cmd);
2192 ret = cmd->se_tfo->queue_status(cmd);
2193 if (ret == -EAGAIN || ret == -ENOMEM)
2200 transport_lun_remove_cmd(cmd);
2201 transport_cmd_check_stop_to_fabric(cmd);
2205 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2206 " data_direction: %d\n", cmd, cmd->data_direction);
2207 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2208 transport_handle_queue_full(cmd, cmd->se_dev);
2211 void target_free_sgl(struct scatterlist *sgl, int nents)
2213 struct scatterlist *sg;
2216 for_each_sg(sgl, sg, nents, count)
2217 __free_page(sg_page(sg));
2221 EXPORT_SYMBOL(target_free_sgl);
2223 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2226 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2227 * emulation, and free + reset pointers if necessary..
2229 if (!cmd->t_data_sg_orig)
2232 kfree(cmd->t_data_sg);
2233 cmd->t_data_sg = cmd->t_data_sg_orig;
2234 cmd->t_data_sg_orig = NULL;
2235 cmd->t_data_nents = cmd->t_data_nents_orig;
2236 cmd->t_data_nents_orig = 0;
2239 static inline void transport_free_pages(struct se_cmd *cmd)
2241 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2242 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2243 cmd->t_prot_sg = NULL;
2244 cmd->t_prot_nents = 0;
2247 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2249 * Release special case READ buffer payload required for
2250 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2252 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2253 target_free_sgl(cmd->t_bidi_data_sg,
2254 cmd->t_bidi_data_nents);
2255 cmd->t_bidi_data_sg = NULL;
2256 cmd->t_bidi_data_nents = 0;
2258 transport_reset_sgl_orig(cmd);
2261 transport_reset_sgl_orig(cmd);
2263 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2264 cmd->t_data_sg = NULL;
2265 cmd->t_data_nents = 0;
2267 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2268 cmd->t_bidi_data_sg = NULL;
2269 cmd->t_bidi_data_nents = 0;
2273 * transport_put_cmd - release a reference to a command
2274 * @cmd: command to release
2276 * This routine releases our reference to the command and frees it if possible.
2278 static int transport_put_cmd(struct se_cmd *cmd)
2280 BUG_ON(!cmd->se_tfo);
2282 * If this cmd has been setup with target_get_sess_cmd(), drop
2283 * the kref and call ->release_cmd() in kref callback.
2285 return target_put_sess_cmd(cmd);
2288 void *transport_kmap_data_sg(struct se_cmd *cmd)
2290 struct scatterlist *sg = cmd->t_data_sg;
2291 struct page **pages;
2295 * We need to take into account a possible offset here for fabrics like
2296 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2297 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2299 if (!cmd->t_data_nents)
2303 if (cmd->t_data_nents == 1)
2304 return kmap(sg_page(sg)) + sg->offset;
2306 /* >1 page. use vmap */
2307 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2311 /* convert sg[] to pages[] */
2312 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2313 pages[i] = sg_page(sg);
2316 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2318 if (!cmd->t_data_vmap)
2321 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2323 EXPORT_SYMBOL(transport_kmap_data_sg);
2325 void transport_kunmap_data_sg(struct se_cmd *cmd)
2327 if (!cmd->t_data_nents) {
2329 } else if (cmd->t_data_nents == 1) {
2330 kunmap(sg_page(cmd->t_data_sg));
2334 vunmap(cmd->t_data_vmap);
2335 cmd->t_data_vmap = NULL;
2337 EXPORT_SYMBOL(transport_kunmap_data_sg);
2340 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2341 bool zero_page, bool chainable)
2343 struct scatterlist *sg;
2345 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2346 unsigned int nalloc, nent;
2349 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2352 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
2356 sg_init_table(sg, nalloc);
2359 u32 page_len = min_t(u32, length, PAGE_SIZE);
2360 page = alloc_page(GFP_KERNEL | zero_flag);
2364 sg_set_page(&sg[i], page, page_len, 0);
2375 __free_page(sg_page(&sg[i]));
2380 EXPORT_SYMBOL(target_alloc_sgl);
2383 * Allocate any required resources to execute the command. For writes we
2384 * might not have the payload yet, so notify the fabric via a call to
2385 * ->write_pending instead. Otherwise place it on the execution queue.
2388 transport_generic_new_cmd(struct se_cmd *cmd)
2391 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2393 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2394 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2395 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2396 cmd->prot_length, true, false);
2398 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2402 * Determine is the TCM fabric module has already allocated physical
2403 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2406 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2409 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2410 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2413 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2414 bidi_length = cmd->t_task_nolb *
2415 cmd->se_dev->dev_attrib.block_size;
2417 bidi_length = cmd->data_length;
2419 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2420 &cmd->t_bidi_data_nents,
2421 bidi_length, zero_flag, false);
2423 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2426 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2427 cmd->data_length, zero_flag, false);
2429 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2430 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2433 * Special case for COMPARE_AND_WRITE with fabrics
2434 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2436 u32 caw_length = cmd->t_task_nolb *
2437 cmd->se_dev->dev_attrib.block_size;
2439 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2440 &cmd->t_bidi_data_nents,
2441 caw_length, zero_flag, false);
2443 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2446 * If this command is not a write we can execute it right here,
2447 * for write buffers we need to notify the fabric driver first
2448 * and let it call back once the write buffers are ready.
2450 target_add_to_state_list(cmd);
2451 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
2452 target_execute_cmd(cmd);
2455 transport_cmd_check_stop(cmd, false, true);
2457 ret = cmd->se_tfo->write_pending(cmd);
2458 if (ret == -EAGAIN || ret == -ENOMEM)
2461 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2464 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2467 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2468 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2469 transport_handle_queue_full(cmd, cmd->se_dev);
2472 EXPORT_SYMBOL(transport_generic_new_cmd);
2474 static void transport_write_pending_qf(struct se_cmd *cmd)
2478 ret = cmd->se_tfo->write_pending(cmd);
2479 if (ret == -EAGAIN || ret == -ENOMEM) {
2480 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2482 transport_handle_queue_full(cmd, cmd->se_dev);
2487 __transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2488 unsigned long *flags);
2490 static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2492 unsigned long flags;
2494 spin_lock_irqsave(&cmd->t_state_lock, flags);
2495 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2496 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2499 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2502 bool aborted = false, tas = false;
2504 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2505 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2506 target_wait_free_cmd(cmd, &aborted, &tas);
2508 if (!aborted || tas)
2509 ret = transport_put_cmd(cmd);
2512 target_wait_free_cmd(cmd, &aborted, &tas);
2514 * Handle WRITE failure case where transport_generic_new_cmd()
2515 * has already added se_cmd to state_list, but fabric has
2516 * failed command before I/O submission.
2518 if (cmd->state_active)
2519 target_remove_from_state_list(cmd);
2522 transport_lun_remove_cmd(cmd);
2524 if (!aborted || tas)
2525 ret = transport_put_cmd(cmd);
2528 * If the task has been internally aborted due to TMR ABORT_TASK
2529 * or LUN_RESET, target_core_tmr.c is responsible for performing
2530 * the remaining calls to target_put_sess_cmd(), and not the
2531 * callers of this function.
2534 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2535 wait_for_completion(&cmd->cmd_wait_comp);
2536 cmd->se_tfo->release_cmd(cmd);
2541 EXPORT_SYMBOL(transport_generic_free_cmd);
2543 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2544 * @se_cmd: command descriptor to add
2545 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2547 int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
2549 struct se_session *se_sess = se_cmd->se_sess;
2550 unsigned long flags;
2554 * Add a second kref if the fabric caller is expecting to handle
2555 * fabric acknowledgement that requires two target_put_sess_cmd()
2556 * invocations before se_cmd descriptor release.
2559 if (!kref_get_unless_zero(&se_cmd->cmd_kref))
2562 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2565 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2566 if (se_sess->sess_tearing_down) {
2570 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2572 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2574 if (ret && ack_kref)
2575 target_put_sess_cmd(se_cmd);
2579 EXPORT_SYMBOL(target_get_sess_cmd);
2581 static void target_free_cmd_mem(struct se_cmd *cmd)
2583 transport_free_pages(cmd);
2585 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2586 core_tmr_release_req(cmd->se_tmr_req);
2587 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2588 kfree(cmd->t_task_cdb);
2591 static void target_release_cmd_kref(struct kref *kref)
2593 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2594 struct se_session *se_sess = se_cmd->se_sess;
2595 unsigned long flags;
2598 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2600 spin_lock(&se_cmd->t_state_lock);
2601 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2602 (se_cmd->transport_state & CMD_T_ABORTED);
2603 spin_unlock(&se_cmd->t_state_lock);
2605 if (se_cmd->cmd_wait_set || fabric_stop) {
2606 list_del_init(&se_cmd->se_cmd_list);
2607 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2608 target_free_cmd_mem(se_cmd);
2609 complete(&se_cmd->cmd_wait_comp);
2612 list_del_init(&se_cmd->se_cmd_list);
2613 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2615 target_free_cmd_mem(se_cmd);
2616 se_cmd->se_tfo->release_cmd(se_cmd);
2619 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2620 * @se_cmd: command descriptor to drop
2622 int target_put_sess_cmd(struct se_cmd *se_cmd)
2624 struct se_session *se_sess = se_cmd->se_sess;
2627 target_free_cmd_mem(se_cmd);
2628 se_cmd->se_tfo->release_cmd(se_cmd);
2631 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2633 EXPORT_SYMBOL(target_put_sess_cmd);
2635 /* target_sess_cmd_list_set_waiting - Flag all commands in
2636 * sess_cmd_list to complete cmd_wait_comp. Set
2637 * sess_tearing_down so no more commands are queued.
2638 * @se_sess: session to flag
2640 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2642 struct se_cmd *se_cmd, *tmp_cmd;
2643 unsigned long flags;
2646 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2647 if (se_sess->sess_tearing_down) {
2648 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2651 se_sess->sess_tearing_down = 1;
2652 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2654 list_for_each_entry_safe(se_cmd, tmp_cmd,
2655 &se_sess->sess_wait_list, se_cmd_list) {
2656 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2658 se_cmd->cmd_wait_set = 1;
2659 spin_lock(&se_cmd->t_state_lock);
2660 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2661 spin_unlock(&se_cmd->t_state_lock);
2663 list_del_init(&se_cmd->se_cmd_list);
2666 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2668 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2670 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2671 * @se_sess: session to wait for active I/O
2673 void target_wait_for_sess_cmds(struct se_session *se_sess)
2675 struct se_cmd *se_cmd, *tmp_cmd;
2676 unsigned long flags;
2679 list_for_each_entry_safe(se_cmd, tmp_cmd,
2680 &se_sess->sess_wait_list, se_cmd_list) {
2681 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2682 " %d\n", se_cmd, se_cmd->t_state,
2683 se_cmd->se_tfo->get_cmd_state(se_cmd));
2685 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2686 tas = (se_cmd->transport_state & CMD_T_TAS);
2687 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2689 if (!target_put_sess_cmd(se_cmd)) {
2691 target_put_sess_cmd(se_cmd);
2694 wait_for_completion(&se_cmd->cmd_wait_comp);
2695 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2696 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2697 se_cmd->se_tfo->get_cmd_state(se_cmd));
2699 se_cmd->se_tfo->release_cmd(se_cmd);
2702 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2703 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2704 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2707 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2709 void transport_clear_lun_ref(struct se_lun *lun)
2711 percpu_ref_kill(&lun->lun_ref);
2712 wait_for_completion(&lun->lun_ref_comp);
2716 __transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2717 bool *aborted, bool *tas, unsigned long *flags)
2718 __releases(&cmd->t_state_lock)
2719 __acquires(&cmd->t_state_lock)
2722 assert_spin_locked(&cmd->t_state_lock);
2723 WARN_ON_ONCE(!irqs_disabled());
2726 cmd->transport_state |= CMD_T_FABRIC_STOP;
2728 if (cmd->transport_state & CMD_T_ABORTED)
2731 if (cmd->transport_state & CMD_T_TAS)
2734 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2735 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2738 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2739 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2742 if (!(cmd->transport_state & CMD_T_ACTIVE))
2745 if (fabric_stop && *aborted)
2748 cmd->transport_state |= CMD_T_STOP;
2750 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2751 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2752 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2754 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
2756 wait_for_completion(&cmd->t_transport_stop_comp);
2758 spin_lock_irqsave(&cmd->t_state_lock, *flags);
2759 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2761 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2762 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
2768 * transport_wait_for_tasks - wait for completion to occur
2769 * @cmd: command to wait
2771 * Called from frontend fabric context to wait for storage engine
2772 * to pause and/or release frontend generated struct se_cmd.
2774 bool transport_wait_for_tasks(struct se_cmd *cmd)
2776 unsigned long flags;
2777 bool ret, aborted = false, tas = false;
2779 spin_lock_irqsave(&cmd->t_state_lock, flags);
2780 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
2781 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2785 EXPORT_SYMBOL(transport_wait_for_tasks);
2791 bool add_sector_info;
2794 static const struct sense_info sense_info_table[] = {
2798 [TCM_NON_EXISTENT_LUN] = {
2799 .key = ILLEGAL_REQUEST,
2800 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2802 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2803 .key = ILLEGAL_REQUEST,
2804 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2806 [TCM_SECTOR_COUNT_TOO_MANY] = {
2807 .key = ILLEGAL_REQUEST,
2808 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2810 [TCM_UNKNOWN_MODE_PAGE] = {
2811 .key = ILLEGAL_REQUEST,
2812 .asc = 0x24, /* INVALID FIELD IN CDB */
2814 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2815 .key = ABORTED_COMMAND,
2816 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2819 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2820 .key = ABORTED_COMMAND,
2821 .asc = 0x0c, /* WRITE ERROR */
2822 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2824 [TCM_INVALID_CDB_FIELD] = {
2825 .key = ILLEGAL_REQUEST,
2826 .asc = 0x24, /* INVALID FIELD IN CDB */
2828 [TCM_INVALID_PARAMETER_LIST] = {
2829 .key = ILLEGAL_REQUEST,
2830 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2832 [TCM_TOO_MANY_TARGET_DESCS] = {
2833 .key = ILLEGAL_REQUEST,
2835 .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */
2837 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = {
2838 .key = ILLEGAL_REQUEST,
2840 .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */
2842 [TCM_TOO_MANY_SEGMENT_DESCS] = {
2843 .key = ILLEGAL_REQUEST,
2845 .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */
2847 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = {
2848 .key = ILLEGAL_REQUEST,
2850 .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */
2852 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2853 .key = ILLEGAL_REQUEST,
2854 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2856 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2857 .key = ILLEGAL_REQUEST,
2858 .asc = 0x0c, /* WRITE ERROR */
2859 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2861 [TCM_SERVICE_CRC_ERROR] = {
2862 .key = ABORTED_COMMAND,
2863 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2864 .ascq = 0x05, /* N/A */
2866 [TCM_SNACK_REJECTED] = {
2867 .key = ABORTED_COMMAND,
2868 .asc = 0x11, /* READ ERROR */
2869 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2871 [TCM_WRITE_PROTECTED] = {
2872 .key = DATA_PROTECT,
2873 .asc = 0x27, /* WRITE PROTECTED */
2875 [TCM_ADDRESS_OUT_OF_RANGE] = {
2876 .key = ILLEGAL_REQUEST,
2877 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2879 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2880 .key = UNIT_ATTENTION,
2882 [TCM_CHECK_CONDITION_NOT_READY] = {
2885 [TCM_MISCOMPARE_VERIFY] = {
2887 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2890 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
2891 .key = ABORTED_COMMAND,
2893 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2894 .add_sector_info = true,
2896 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
2897 .key = ABORTED_COMMAND,
2899 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2900 .add_sector_info = true,
2902 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
2903 .key = ABORTED_COMMAND,
2905 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2906 .add_sector_info = true,
2908 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
2909 .key = COPY_ABORTED,
2911 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
2914 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2916 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2917 * Solaris initiators. Returning NOT READY instead means the
2918 * operations will be retried a finite number of times and we
2919 * can survive intermittent errors.
2922 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2926 static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
2928 const struct sense_info *si;
2929 u8 *buffer = cmd->sense_buffer;
2930 int r = (__force int)reason;
2932 bool desc_format = target_sense_desc_format(cmd->se_dev);
2934 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2935 si = &sense_info_table[r];
2937 si = &sense_info_table[(__force int)
2938 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2940 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2941 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2942 WARN_ON_ONCE(asc == 0);
2943 } else if (si->asc == 0) {
2944 WARN_ON_ONCE(cmd->scsi_asc == 0);
2945 asc = cmd->scsi_asc;
2946 ascq = cmd->scsi_ascq;
2952 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
2953 if (si->add_sector_info)
2954 return scsi_set_sense_information(buffer,
2955 cmd->scsi_sense_length,
2962 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2963 sense_reason_t reason, int from_transport)
2965 unsigned long flags;
2967 spin_lock_irqsave(&cmd->t_state_lock, flags);
2968 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2969 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2972 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2973 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2975 if (!from_transport) {
2978 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2979 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2980 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2981 rc = translate_sense_reason(cmd, reason);
2986 trace_target_cmd_complete(cmd);
2987 return cmd->se_tfo->queue_status(cmd);
2989 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2991 static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2992 __releases(&cmd->t_state_lock)
2993 __acquires(&cmd->t_state_lock)
2995 assert_spin_locked(&cmd->t_state_lock);
2996 WARN_ON_ONCE(!irqs_disabled());
2998 if (!(cmd->transport_state & CMD_T_ABORTED))
3001 * If cmd has been aborted but either no status is to be sent or it has
3002 * already been sent, just return
3004 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
3006 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
3010 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
3011 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
3013 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
3014 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3015 trace_target_cmd_complete(cmd);
3017 spin_unlock_irq(&cmd->t_state_lock);
3018 cmd->se_tfo->queue_status(cmd);
3019 spin_lock_irq(&cmd->t_state_lock);
3024 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3028 spin_lock_irq(&cmd->t_state_lock);
3029 ret = __transport_check_aborted_status(cmd, send_status);
3030 spin_unlock_irq(&cmd->t_state_lock);
3034 EXPORT_SYMBOL(transport_check_aborted_status);
3036 void transport_send_task_abort(struct se_cmd *cmd)
3038 unsigned long flags;
3040 spin_lock_irqsave(&cmd->t_state_lock, flags);
3041 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
3042 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3045 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3048 * If there are still expected incoming fabric WRITEs, we wait
3049 * until until they have completed before sending a TASK_ABORTED
3050 * response. This response with TASK_ABORTED status will be
3051 * queued back to fabric module by transport_check_aborted_status().
3053 if (cmd->data_direction == DMA_TO_DEVICE) {
3054 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3055 spin_lock_irqsave(&cmd->t_state_lock, flags);
3056 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3057 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3060 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
3061 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3066 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3068 transport_lun_remove_cmd(cmd);
3070 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3071 cmd->t_task_cdb[0], cmd->tag);
3073 trace_target_cmd_complete(cmd);
3074 cmd->se_tfo->queue_status(cmd);
3077 static void target_tmr_work(struct work_struct *work)
3079 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3080 struct se_device *dev = cmd->se_dev;
3081 struct se_tmr_req *tmr = cmd->se_tmr_req;
3082 unsigned long flags;
3085 spin_lock_irqsave(&cmd->t_state_lock, flags);
3086 if (cmd->transport_state & CMD_T_ABORTED) {
3087 tmr->response = TMR_FUNCTION_REJECTED;
3088 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3091 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3093 switch (tmr->function) {
3094 case TMR_ABORT_TASK:
3095 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3097 case TMR_ABORT_TASK_SET:
3099 case TMR_CLEAR_TASK_SET:
3100 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3103 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3104 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3105 TMR_FUNCTION_REJECTED;
3106 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3107 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3108 cmd->orig_fe_lun, 0x29,
3109 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3112 case TMR_TARGET_WARM_RESET:
3113 tmr->response = TMR_FUNCTION_REJECTED;
3115 case TMR_TARGET_COLD_RESET:
3116 tmr->response = TMR_FUNCTION_REJECTED;
3119 pr_err("Uknown TMR function: 0x%02x.\n",
3121 tmr->response = TMR_FUNCTION_REJECTED;
3125 spin_lock_irqsave(&cmd->t_state_lock, flags);
3126 if (cmd->transport_state & CMD_T_ABORTED) {
3127 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3130 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3132 cmd->se_tfo->queue_tm_rsp(cmd);
3135 transport_cmd_check_stop_to_fabric(cmd);
3138 int transport_generic_handle_tmr(
3141 unsigned long flags;
3142 bool aborted = false;
3144 spin_lock_irqsave(&cmd->t_state_lock, flags);
3145 if (cmd->transport_state & CMD_T_ABORTED) {
3148 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3149 cmd->transport_state |= CMD_T_ACTIVE;
3151 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3154 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
3155 "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
3156 cmd->se_tmr_req->ref_task_tag, cmd->tag);
3157 transport_cmd_check_stop_to_fabric(cmd);
3161 INIT_WORK(&cmd->work, target_tmr_work);
3162 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3165 EXPORT_SYMBOL(transport_generic_handle_tmr);
3168 target_check_wce(struct se_device *dev)
3172 if (dev->transport->get_write_cache)
3173 wce = dev->transport->get_write_cache(dev);
3174 else if (dev->dev_attrib.emulate_write_cache > 0)
3181 target_check_fua(struct se_device *dev)
3183 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;