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 <asm/unaligned.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_tcq.h>
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
47 #include <target/target_core_configfs.h>
49 #include "target_core_internal.h"
50 #include "target_core_alua.h"
51 #include "target_core_pr.h"
52 #include "target_core_ua.h"
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/target.h>
57 static struct workqueue_struct *target_completion_wq;
58 static struct kmem_cache *se_sess_cache;
59 struct kmem_cache *se_ua_cache;
60 struct kmem_cache *t10_pr_reg_cache;
61 struct kmem_cache *t10_alua_lu_gp_cache;
62 struct kmem_cache *t10_alua_lu_gp_mem_cache;
63 struct kmem_cache *t10_alua_tg_pt_gp_cache;
64 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
65 struct kmem_cache *t10_alua_lba_map_cache;
66 struct kmem_cache *t10_alua_lba_map_mem_cache;
68 static void transport_complete_task_attr(struct se_cmd *cmd);
69 static void transport_handle_queue_full(struct se_cmd *cmd,
70 struct se_device *dev);
71 static int transport_put_cmd(struct se_cmd *cmd);
72 static void target_complete_ok_work(struct work_struct *work);
74 int init_se_kmem_caches(void)
76 se_sess_cache = kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session), __alignof__(struct se_session),
80 pr_err("kmem_cache_create() for struct se_session"
84 se_ua_cache = kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua), __alignof__(struct se_ua),
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
89 goto out_free_sess_cache;
91 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration),
93 __alignof__(struct t10_pr_registration), 0, NULL);
94 if (!t10_pr_reg_cache) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
97 goto out_free_ua_cache;
99 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
102 if (!t10_alua_lu_gp_cache) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
105 goto out_free_pr_reg_cache;
107 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member),
109 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
110 if (!t10_alua_lu_gp_mem_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
113 goto out_free_lu_gp_cache;
115 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp),
117 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
118 if (!t10_alua_tg_pt_gp_cache) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
121 goto out_free_lu_gp_mem_cache;
123 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member),
126 __alignof__(struct t10_alua_tg_pt_gp_member),
128 if (!t10_alua_tg_pt_gp_mem_cache) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
131 goto out_free_tg_pt_gp_cache;
133 t10_alua_lba_map_cache = kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map),
136 __alignof__(struct t10_alua_lba_map), 0, NULL);
137 if (!t10_alua_lba_map_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
140 goto out_free_tg_pt_gp_mem_cache;
142 t10_alua_lba_map_mem_cache = kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member),
145 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
146 if (!t10_alua_lba_map_mem_cache) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
149 goto out_free_lba_map_cache;
152 target_completion_wq = alloc_workqueue("target_completion",
154 if (!target_completion_wq)
155 goto out_free_lba_map_mem_cache;
159 out_free_lba_map_mem_cache:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
161 out_free_lba_map_cache:
162 kmem_cache_destroy(t10_alua_lba_map_cache);
163 out_free_tg_pt_gp_mem_cache:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
165 out_free_tg_pt_gp_cache:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167 out_free_lu_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169 out_free_lu_gp_cache:
170 kmem_cache_destroy(t10_alua_lu_gp_cache);
171 out_free_pr_reg_cache:
172 kmem_cache_destroy(t10_pr_reg_cache);
174 kmem_cache_destroy(se_ua_cache);
176 kmem_cache_destroy(se_sess_cache);
181 void release_se_kmem_caches(void)
183 destroy_workqueue(target_completion_wq);
184 kmem_cache_destroy(se_sess_cache);
185 kmem_cache_destroy(se_ua_cache);
186 kmem_cache_destroy(t10_pr_reg_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_cache);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
191 kmem_cache_destroy(t10_alua_lba_map_cache);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
195 /* This code ensures unique mib indexes are handed out. */
196 static DEFINE_SPINLOCK(scsi_mib_index_lock);
197 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
200 * Allocate a new row index for the entry type specified
202 u32 scsi_get_new_index(scsi_index_t type)
206 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
208 spin_lock(&scsi_mib_index_lock);
209 new_index = ++scsi_mib_index[type];
210 spin_unlock(&scsi_mib_index_lock);
215 void transport_subsystem_check_init(void)
218 static int sub_api_initialized;
220 if (sub_api_initialized)
223 ret = request_module("target_core_iblock");
225 pr_err("Unable to load target_core_iblock\n");
227 ret = request_module("target_core_file");
229 pr_err("Unable to load target_core_file\n");
231 ret = request_module("target_core_pscsi");
233 pr_err("Unable to load target_core_pscsi\n");
235 ret = request_module("target_core_user");
237 pr_err("Unable to load target_core_user\n");
239 sub_api_initialized = 1;
242 struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
244 struct se_session *se_sess;
246 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
248 pr_err("Unable to allocate struct se_session from"
250 return ERR_PTR(-ENOMEM);
252 INIT_LIST_HEAD(&se_sess->sess_list);
253 INIT_LIST_HEAD(&se_sess->sess_acl_list);
254 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
255 INIT_LIST_HEAD(&se_sess->sess_wait_list);
256 spin_lock_init(&se_sess->sess_cmd_lock);
257 kref_init(&se_sess->sess_kref);
258 se_sess->sup_prot_ops = sup_prot_ops;
262 EXPORT_SYMBOL(transport_init_session);
264 int transport_alloc_session_tags(struct se_session *se_sess,
265 unsigned int tag_num, unsigned int tag_size)
269 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
270 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
271 if (!se_sess->sess_cmd_map) {
272 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
273 if (!se_sess->sess_cmd_map) {
274 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
279 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
281 pr_err("Unable to init se_sess->sess_tag_pool,"
282 " tag_num: %u\n", tag_num);
283 if (is_vmalloc_addr(se_sess->sess_cmd_map))
284 vfree(se_sess->sess_cmd_map);
286 kfree(se_sess->sess_cmd_map);
287 se_sess->sess_cmd_map = NULL;
293 EXPORT_SYMBOL(transport_alloc_session_tags);
295 struct se_session *transport_init_session_tags(unsigned int tag_num,
296 unsigned int tag_size,
297 enum target_prot_op sup_prot_ops)
299 struct se_session *se_sess;
302 se_sess = transport_init_session(sup_prot_ops);
306 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
308 transport_free_session(se_sess);
309 return ERR_PTR(-ENOMEM);
314 EXPORT_SYMBOL(transport_init_session_tags);
317 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
319 void __transport_register_session(
320 struct se_portal_group *se_tpg,
321 struct se_node_acl *se_nacl,
322 struct se_session *se_sess,
323 void *fabric_sess_ptr)
325 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
326 unsigned char buf[PR_REG_ISID_LEN];
328 se_sess->se_tpg = se_tpg;
329 se_sess->fabric_sess_ptr = fabric_sess_ptr;
331 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
333 * Only set for struct se_session's that will actually be moving I/O.
334 * eg: *NOT* discovery sessions.
339 * Determine if fabric allows for T10-PI feature bits exposed to
340 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
342 * If so, then always save prot_type on a per se_node_acl node
343 * basis and re-instate the previous sess_prot_type to avoid
344 * disabling PI from below any previously initiator side
347 if (se_nacl->saved_prot_type)
348 se_sess->sess_prot_type = se_nacl->saved_prot_type;
349 else if (tfo->tpg_check_prot_fabric_only)
350 se_sess->sess_prot_type = se_nacl->saved_prot_type =
351 tfo->tpg_check_prot_fabric_only(se_tpg);
353 * If the fabric module supports an ISID based TransportID,
354 * save this value in binary from the fabric I_T Nexus now.
356 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
357 memset(&buf[0], 0, PR_REG_ISID_LEN);
358 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
359 &buf[0], PR_REG_ISID_LEN);
360 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
362 kref_get(&se_nacl->acl_kref);
364 spin_lock_irq(&se_nacl->nacl_sess_lock);
366 * The se_nacl->nacl_sess pointer will be set to the
367 * last active I_T Nexus for each struct se_node_acl.
369 se_nacl->nacl_sess = se_sess;
371 list_add_tail(&se_sess->sess_acl_list,
372 &se_nacl->acl_sess_list);
373 spin_unlock_irq(&se_nacl->nacl_sess_lock);
375 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
377 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
378 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
380 EXPORT_SYMBOL(__transport_register_session);
382 void transport_register_session(
383 struct se_portal_group *se_tpg,
384 struct se_node_acl *se_nacl,
385 struct se_session *se_sess,
386 void *fabric_sess_ptr)
390 spin_lock_irqsave(&se_tpg->session_lock, flags);
391 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
392 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
394 EXPORT_SYMBOL(transport_register_session);
396 static void target_release_session(struct kref *kref)
398 struct se_session *se_sess = container_of(kref,
399 struct se_session, sess_kref);
400 struct se_portal_group *se_tpg = se_sess->se_tpg;
402 se_tpg->se_tpg_tfo->close_session(se_sess);
405 void target_get_session(struct se_session *se_sess)
407 kref_get(&se_sess->sess_kref);
409 EXPORT_SYMBOL(target_get_session);
411 void target_put_session(struct se_session *se_sess)
413 struct se_portal_group *tpg = se_sess->se_tpg;
415 if (tpg->se_tpg_tfo->put_session != NULL) {
416 tpg->se_tpg_tfo->put_session(se_sess);
419 kref_put(&se_sess->sess_kref, target_release_session);
421 EXPORT_SYMBOL(target_put_session);
423 ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
425 struct se_session *se_sess;
428 spin_lock_bh(&se_tpg->session_lock);
429 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
430 if (!se_sess->se_node_acl)
432 if (!se_sess->se_node_acl->dynamic_node_acl)
434 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
437 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
438 se_sess->se_node_acl->initiatorname);
439 len += 1; /* Include NULL terminator */
441 spin_unlock_bh(&se_tpg->session_lock);
445 EXPORT_SYMBOL(target_show_dynamic_sessions);
447 static void target_complete_nacl(struct kref *kref)
449 struct se_node_acl *nacl = container_of(kref,
450 struct se_node_acl, acl_kref);
452 complete(&nacl->acl_free_comp);
455 void target_put_nacl(struct se_node_acl *nacl)
457 kref_put(&nacl->acl_kref, target_complete_nacl);
460 void transport_deregister_session_configfs(struct se_session *se_sess)
462 struct se_node_acl *se_nacl;
465 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
467 se_nacl = se_sess->se_node_acl;
469 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
470 if (se_nacl->acl_stop == 0)
471 list_del(&se_sess->sess_acl_list);
473 * If the session list is empty, then clear the pointer.
474 * Otherwise, set the struct se_session pointer from the tail
475 * element of the per struct se_node_acl active session list.
477 if (list_empty(&se_nacl->acl_sess_list))
478 se_nacl->nacl_sess = NULL;
480 se_nacl->nacl_sess = container_of(
481 se_nacl->acl_sess_list.prev,
482 struct se_session, sess_acl_list);
484 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
487 EXPORT_SYMBOL(transport_deregister_session_configfs);
489 void transport_free_session(struct se_session *se_sess)
491 if (se_sess->sess_cmd_map) {
492 percpu_ida_destroy(&se_sess->sess_tag_pool);
493 if (is_vmalloc_addr(se_sess->sess_cmd_map))
494 vfree(se_sess->sess_cmd_map);
496 kfree(se_sess->sess_cmd_map);
498 kmem_cache_free(se_sess_cache, se_sess);
500 EXPORT_SYMBOL(transport_free_session);
502 void transport_deregister_session(struct se_session *se_sess)
504 struct se_portal_group *se_tpg = se_sess->se_tpg;
505 const struct target_core_fabric_ops *se_tfo;
506 struct se_node_acl *se_nacl;
508 bool comp_nacl = true;
511 transport_free_session(se_sess);
514 se_tfo = se_tpg->se_tpg_tfo;
516 spin_lock_irqsave(&se_tpg->session_lock, flags);
517 list_del(&se_sess->sess_list);
518 se_sess->se_tpg = NULL;
519 se_sess->fabric_sess_ptr = NULL;
520 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
523 * Determine if we need to do extra work for this initiator node's
524 * struct se_node_acl if it had been previously dynamically generated.
526 se_nacl = se_sess->se_node_acl;
528 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
529 if (se_nacl && se_nacl->dynamic_node_acl) {
530 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
531 list_del(&se_nacl->acl_list);
532 se_tpg->num_node_acls--;
533 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
534 core_tpg_wait_for_nacl_pr_ref(se_nacl);
535 core_free_device_list_for_node(se_nacl, se_tpg);
539 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
542 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
544 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
545 se_tpg->se_tpg_tfo->get_fabric_name());
547 * If last kref is dropping now for an explicit NodeACL, awake sleeping
548 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
551 if (se_nacl && comp_nacl)
552 target_put_nacl(se_nacl);
554 transport_free_session(se_sess);
556 EXPORT_SYMBOL(transport_deregister_session);
559 * Called with cmd->t_state_lock held.
561 static void target_remove_from_state_list(struct se_cmd *cmd)
563 struct se_device *dev = cmd->se_dev;
569 if (cmd->transport_state & CMD_T_BUSY)
572 spin_lock_irqsave(&dev->execute_task_lock, flags);
573 if (cmd->state_active) {
574 list_del(&cmd->state_list);
575 cmd->state_active = false;
577 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
580 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
585 spin_lock_irqsave(&cmd->t_state_lock, flags);
587 cmd->t_state = TRANSPORT_WRITE_PENDING;
589 if (remove_from_lists) {
590 target_remove_from_state_list(cmd);
593 * Clear struct se_cmd->se_lun before the handoff to FE.
599 * Determine if frontend context caller is requesting the stopping of
600 * this command for frontend exceptions.
602 if (cmd->transport_state & CMD_T_STOP) {
603 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
605 cmd->se_tfo->get_task_tag(cmd));
607 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
609 complete_all(&cmd->t_transport_stop_comp);
613 cmd->transport_state &= ~CMD_T_ACTIVE;
614 if (remove_from_lists) {
616 * Some fabric modules like tcm_loop can release
617 * their internally allocated I/O reference now and
620 * Fabric modules are expected to return '1' here if the
621 * se_cmd being passed is released at this point,
622 * or zero if not being released.
624 if (cmd->se_tfo->check_stop_free != NULL) {
625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
626 return cmd->se_tfo->check_stop_free(cmd);
630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
634 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
636 return transport_cmd_check_stop(cmd, true, false);
639 static void transport_lun_remove_cmd(struct se_cmd *cmd)
641 struct se_lun *lun = cmd->se_lun;
646 if (cmpxchg(&cmd->lun_ref_active, true, false))
647 percpu_ref_put(&lun->lun_ref);
650 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
652 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
653 transport_lun_remove_cmd(cmd);
655 * Allow the fabric driver to unmap any resources before
656 * releasing the descriptor via TFO->release_cmd()
659 cmd->se_tfo->aborted_task(cmd);
661 if (transport_cmd_check_stop_to_fabric(cmd))
664 transport_put_cmd(cmd);
667 static void target_complete_failure_work(struct work_struct *work)
669 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
671 transport_generic_request_failure(cmd,
672 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
676 * Used when asking transport to copy Sense Data from the underlying
677 * Linux/SCSI struct scsi_cmnd
679 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
681 struct se_device *dev = cmd->se_dev;
683 WARN_ON(!cmd->se_lun);
688 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
691 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
693 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
694 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
695 return cmd->sense_buffer;
698 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
700 struct se_device *dev = cmd->se_dev;
701 int success = scsi_status == GOOD;
704 cmd->scsi_status = scsi_status;
707 spin_lock_irqsave(&cmd->t_state_lock, flags);
708 cmd->transport_state &= ~CMD_T_BUSY;
710 if (dev && dev->transport->transport_complete) {
711 dev->transport->transport_complete(cmd,
713 transport_get_sense_buffer(cmd));
714 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
719 * See if we are waiting to complete for an exception condition.
721 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
722 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
723 complete(&cmd->task_stop_comp);
728 * Check for case where an explicit ABORT_TASK has been received
729 * and transport_wait_for_tasks() will be waiting for completion..
731 if (cmd->transport_state & CMD_T_ABORTED &&
732 cmd->transport_state & CMD_T_STOP) {
733 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
734 complete_all(&cmd->t_transport_stop_comp);
736 } else if (!success) {
737 INIT_WORK(&cmd->work, target_complete_failure_work);
739 INIT_WORK(&cmd->work, target_complete_ok_work);
742 cmd->t_state = TRANSPORT_COMPLETE;
743 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
744 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
746 queue_work(target_completion_wq, &cmd->work);
748 EXPORT_SYMBOL(target_complete_cmd);
750 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
752 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
753 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
754 cmd->residual_count += cmd->data_length - length;
756 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
757 cmd->residual_count = cmd->data_length - length;
760 cmd->data_length = length;
763 target_complete_cmd(cmd, scsi_status);
765 EXPORT_SYMBOL(target_complete_cmd_with_length);
767 static void target_add_to_state_list(struct se_cmd *cmd)
769 struct se_device *dev = cmd->se_dev;
772 spin_lock_irqsave(&dev->execute_task_lock, flags);
773 if (!cmd->state_active) {
774 list_add_tail(&cmd->state_list, &dev->state_list);
775 cmd->state_active = true;
777 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
781 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
783 static void transport_write_pending_qf(struct se_cmd *cmd);
784 static void transport_complete_qf(struct se_cmd *cmd);
786 void target_qf_do_work(struct work_struct *work)
788 struct se_device *dev = container_of(work, struct se_device,
790 LIST_HEAD(qf_cmd_list);
791 struct se_cmd *cmd, *cmd_tmp;
793 spin_lock_irq(&dev->qf_cmd_lock);
794 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
795 spin_unlock_irq(&dev->qf_cmd_lock);
797 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
798 list_del(&cmd->se_qf_node);
799 atomic_dec_mb(&dev->dev_qf_count);
801 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
802 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
803 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
804 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
807 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
808 transport_write_pending_qf(cmd);
809 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
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);
1107 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1109 struct se_device *dev = cmd->se_dev;
1111 if (cmd->unknown_data_length) {
1112 cmd->data_length = size;
1113 } else if (size != cmd->data_length) {
1114 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1115 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1116 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1117 cmd->data_length, size, cmd->t_task_cdb[0]);
1119 if (cmd->data_direction == DMA_TO_DEVICE) {
1120 pr_err("Rejecting underflow/overflow"
1122 return TCM_INVALID_CDB_FIELD;
1125 * Reject READ_* or WRITE_* with overflow/underflow for
1126 * type SCF_SCSI_DATA_CDB.
1128 if (dev->dev_attrib.block_size != 512) {
1129 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1130 " CDB on non 512-byte sector setup subsystem"
1131 " plugin: %s\n", dev->transport->name);
1132 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1133 return TCM_INVALID_CDB_FIELD;
1136 * For the overflow case keep the existing fabric provided
1137 * ->data_length. Otherwise for the underflow case, reset
1138 * ->data_length to the smaller SCSI expected data transfer
1141 if (size > cmd->data_length) {
1142 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1143 cmd->residual_count = (size - cmd->data_length);
1145 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1146 cmd->residual_count = (cmd->data_length - size);
1147 cmd->data_length = size;
1156 * Used by fabric modules containing a local struct se_cmd within their
1157 * fabric dependent per I/O descriptor.
1159 void transport_init_se_cmd(
1161 const struct target_core_fabric_ops *tfo,
1162 struct se_session *se_sess,
1166 unsigned char *sense_buffer)
1168 INIT_LIST_HEAD(&cmd->se_delayed_node);
1169 INIT_LIST_HEAD(&cmd->se_qf_node);
1170 INIT_LIST_HEAD(&cmd->se_cmd_list);
1171 INIT_LIST_HEAD(&cmd->state_list);
1172 init_completion(&cmd->t_transport_stop_comp);
1173 init_completion(&cmd->cmd_wait_comp);
1174 init_completion(&cmd->task_stop_comp);
1175 spin_lock_init(&cmd->t_state_lock);
1176 kref_init(&cmd->cmd_kref);
1177 cmd->transport_state = CMD_T_DEV_ACTIVE;
1180 cmd->se_sess = se_sess;
1181 cmd->data_length = data_length;
1182 cmd->data_direction = data_direction;
1183 cmd->sam_task_attr = task_attr;
1184 cmd->sense_buffer = sense_buffer;
1186 cmd->state_active = false;
1188 EXPORT_SYMBOL(transport_init_se_cmd);
1190 static sense_reason_t
1191 transport_check_alloc_task_attr(struct se_cmd *cmd)
1193 struct se_device *dev = cmd->se_dev;
1196 * Check if SAM Task Attribute emulation is enabled for this
1197 * struct se_device storage object
1199 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1202 if (cmd->sam_task_attr == TCM_ACA_TAG) {
1203 pr_debug("SAM Task Attribute ACA"
1204 " emulation is not supported\n");
1205 return TCM_INVALID_CDB_FIELD;
1208 * Used to determine when ORDERED commands should go from
1209 * Dormant to Active status.
1211 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1212 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1213 cmd->se_ordered_id, cmd->sam_task_attr,
1214 dev->transport->name);
1219 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1221 struct se_device *dev = cmd->se_dev;
1225 * Ensure that the received CDB is less than the max (252 + 8) bytes
1226 * for VARIABLE_LENGTH_CMD
1228 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1229 pr_err("Received SCSI CDB with command_size: %d that"
1230 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1231 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1232 return TCM_INVALID_CDB_FIELD;
1235 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1236 * allocate the additional extended CDB buffer now.. Otherwise
1237 * setup the pointer from __t_task_cdb to t_task_cdb.
1239 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1240 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1242 if (!cmd->t_task_cdb) {
1243 pr_err("Unable to allocate cmd->t_task_cdb"
1244 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1245 scsi_command_size(cdb),
1246 (unsigned long)sizeof(cmd->__t_task_cdb));
1247 return TCM_OUT_OF_RESOURCES;
1250 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1252 * Copy the original CDB into cmd->
1254 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1256 trace_target_sequencer_start(cmd);
1259 * Check for an existing UNIT ATTENTION condition
1261 ret = target_scsi3_ua_check(cmd);
1265 ret = target_alua_state_check(cmd);
1269 ret = target_check_reservation(cmd);
1271 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1275 ret = dev->transport->parse_cdb(cmd);
1279 ret = transport_check_alloc_task_attr(cmd);
1283 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1285 spin_lock(&cmd->se_lun->lun_sep_lock);
1286 if (cmd->se_lun->lun_sep)
1287 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1288 spin_unlock(&cmd->se_lun->lun_sep_lock);
1291 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1294 * Used by fabric module frontends to queue tasks directly.
1295 * Many only be used from process context only
1297 int transport_handle_cdb_direct(
1304 pr_err("cmd->se_lun is NULL\n");
1307 if (in_interrupt()) {
1309 pr_err("transport_generic_handle_cdb cannot be called"
1310 " from interrupt context\n");
1314 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1315 * outstanding descriptors are handled correctly during shutdown via
1316 * transport_wait_for_tasks()
1318 * Also, we don't take cmd->t_state_lock here as we only expect
1319 * this to be called for initial descriptor submission.
1321 cmd->t_state = TRANSPORT_NEW_CMD;
1322 cmd->transport_state |= CMD_T_ACTIVE;
1325 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1326 * so follow TRANSPORT_NEW_CMD processing thread context usage
1327 * and call transport_generic_request_failure() if necessary..
1329 ret = transport_generic_new_cmd(cmd);
1331 transport_generic_request_failure(cmd, ret);
1334 EXPORT_SYMBOL(transport_handle_cdb_direct);
1337 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1338 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1340 if (!sgl || !sgl_count)
1344 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1345 * scatterlists already have been set to follow what the fabric
1346 * passes for the original expected data transfer length.
1348 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1349 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1350 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1351 return TCM_INVALID_CDB_FIELD;
1354 cmd->t_data_sg = sgl;
1355 cmd->t_data_nents = sgl_count;
1356 cmd->t_bidi_data_sg = sgl_bidi;
1357 cmd->t_bidi_data_nents = sgl_bidi_count;
1359 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1364 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1365 * se_cmd + use pre-allocated SGL memory.
1367 * @se_cmd: command descriptor to submit
1368 * @se_sess: associated se_sess for endpoint
1369 * @cdb: pointer to SCSI CDB
1370 * @sense: pointer to SCSI sense buffer
1371 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1372 * @data_length: fabric expected data transfer length
1373 * @task_addr: SAM task attribute
1374 * @data_dir: DMA data direction
1375 * @flags: flags for command submission from target_sc_flags_tables
1376 * @sgl: struct scatterlist memory for unidirectional mapping
1377 * @sgl_count: scatterlist count for unidirectional mapping
1378 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1379 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1380 * @sgl_prot: struct scatterlist memory protection information
1381 * @sgl_prot_count: scatterlist count for protection information
1383 * Returns non zero to signal active I/O shutdown failure. All other
1384 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1385 * but still return zero here.
1387 * This may only be called from process context, and also currently
1388 * assumes internal allocation of fabric payload buffer by target-core.
1390 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1391 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1392 u32 data_length, int task_attr, int data_dir, int flags,
1393 struct scatterlist *sgl, u32 sgl_count,
1394 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1395 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1397 struct se_portal_group *se_tpg;
1401 se_tpg = se_sess->se_tpg;
1403 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1404 BUG_ON(in_interrupt());
1406 * Initialize se_cmd for target operation. From this point
1407 * exceptions are handled by sending exception status via
1408 * target_core_fabric_ops->queue_status() callback
1410 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1411 data_length, data_dir, task_attr, sense);
1412 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1413 se_cmd->unknown_data_length = 1;
1415 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1416 * se_sess->sess_cmd_list. A second kref_get here is necessary
1417 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1418 * kref_put() to happen during fabric packet acknowledgement.
1420 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1424 * Signal bidirectional data payloads to target-core
1426 if (flags & TARGET_SCF_BIDI_OP)
1427 se_cmd->se_cmd_flags |= SCF_BIDI;
1429 * Locate se_lun pointer and attach it to struct se_cmd
1431 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1433 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1434 target_put_sess_cmd(se_cmd);
1438 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1440 transport_generic_request_failure(se_cmd, rc);
1445 * Save pointers for SGLs containing protection information,
1448 if (sgl_prot_count) {
1449 se_cmd->t_prot_sg = sgl_prot;
1450 se_cmd->t_prot_nents = sgl_prot_count;
1454 * When a non zero sgl_count has been passed perform SGL passthrough
1455 * mapping for pre-allocated fabric memory instead of having target
1456 * core perform an internal SGL allocation..
1458 if (sgl_count != 0) {
1462 * A work-around for tcm_loop as some userspace code via
1463 * scsi-generic do not memset their associated read buffers,
1464 * so go ahead and do that here for type non-data CDBs. Also
1465 * note that this is currently guaranteed to be a single SGL
1466 * for this case by target core in target_setup_cmd_from_cdb()
1467 * -> transport_generic_cmd_sequencer().
1469 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1470 se_cmd->data_direction == DMA_FROM_DEVICE) {
1471 unsigned char *buf = NULL;
1474 buf = kmap(sg_page(sgl)) + sgl->offset;
1477 memset(buf, 0, sgl->length);
1478 kunmap(sg_page(sgl));
1482 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1483 sgl_bidi, sgl_bidi_count);
1485 transport_generic_request_failure(se_cmd, rc);
1491 * Check if we need to delay processing because of ALUA
1492 * Active/NonOptimized primary access state..
1494 core_alua_check_nonop_delay(se_cmd);
1496 transport_handle_cdb_direct(se_cmd);
1499 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1502 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1504 * @se_cmd: command descriptor to submit
1505 * @se_sess: associated se_sess for endpoint
1506 * @cdb: pointer to SCSI CDB
1507 * @sense: pointer to SCSI sense buffer
1508 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1509 * @data_length: fabric expected data transfer length
1510 * @task_addr: SAM task attribute
1511 * @data_dir: DMA data direction
1512 * @flags: flags for command submission from target_sc_flags_tables
1514 * Returns non zero to signal active I/O shutdown failure. All other
1515 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1516 * but still return zero here.
1518 * This may only be called from process context, and also currently
1519 * assumes internal allocation of fabric payload buffer by target-core.
1521 * It also assumes interal target core SGL memory allocation.
1523 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1524 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1525 u32 data_length, int task_attr, int data_dir, int flags)
1527 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1528 unpacked_lun, data_length, task_attr, data_dir,
1529 flags, NULL, 0, NULL, 0, NULL, 0);
1531 EXPORT_SYMBOL(target_submit_cmd);
1533 static void target_complete_tmr_failure(struct work_struct *work)
1535 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1537 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1538 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1540 transport_cmd_check_stop_to_fabric(se_cmd);
1544 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1547 * @se_cmd: command descriptor to submit
1548 * @se_sess: associated se_sess for endpoint
1549 * @sense: pointer to SCSI sense buffer
1550 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1551 * @fabric_context: fabric context for TMR req
1552 * @tm_type: Type of TM request
1553 * @gfp: gfp type for caller
1554 * @tag: referenced task tag for TMR_ABORT_TASK
1555 * @flags: submit cmd flags
1557 * Callable from all contexts.
1560 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1561 unsigned char *sense, u32 unpacked_lun,
1562 void *fabric_tmr_ptr, unsigned char tm_type,
1563 gfp_t gfp, unsigned int tag, int flags)
1565 struct se_portal_group *se_tpg;
1568 se_tpg = se_sess->se_tpg;
1571 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1572 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
1574 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1575 * allocation failure.
1577 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1581 if (tm_type == TMR_ABORT_TASK)
1582 se_cmd->se_tmr_req->ref_task_tag = tag;
1584 /* See target_submit_cmd for commentary */
1585 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1587 core_tmr_release_req(se_cmd->se_tmr_req);
1591 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1594 * For callback during failure handling, push this work off
1595 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1597 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1598 schedule_work(&se_cmd->work);
1601 transport_generic_handle_tmr(se_cmd);
1604 EXPORT_SYMBOL(target_submit_tmr);
1607 * If the cmd is active, request it to be stopped and sleep until it
1610 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1611 __releases(&cmd->t_state_lock)
1612 __acquires(&cmd->t_state_lock)
1614 bool was_active = false;
1616 if (cmd->transport_state & CMD_T_BUSY) {
1617 cmd->transport_state |= CMD_T_REQUEST_STOP;
1618 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1620 pr_debug("cmd %p waiting to complete\n", cmd);
1621 wait_for_completion(&cmd->task_stop_comp);
1622 pr_debug("cmd %p stopped successfully\n", cmd);
1624 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1625 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1626 cmd->transport_state &= ~CMD_T_BUSY;
1634 * Handle SAM-esque emulation for generic transport request failures.
1636 void transport_generic_request_failure(struct se_cmd *cmd,
1637 sense_reason_t sense_reason)
1641 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1642 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1643 cmd->t_task_cdb[0]);
1644 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1645 cmd->se_tfo->get_cmd_state(cmd),
1646 cmd->t_state, sense_reason);
1647 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1648 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1649 (cmd->transport_state & CMD_T_STOP) != 0,
1650 (cmd->transport_state & CMD_T_SENT) != 0);
1653 * For SAM Task Attribute emulation for failed struct se_cmd
1655 transport_complete_task_attr(cmd);
1657 * Handle special case for COMPARE_AND_WRITE failure, where the
1658 * callback is expected to drop the per device ->caw_sem.
1660 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1661 cmd->transport_complete_callback)
1662 cmd->transport_complete_callback(cmd, false);
1664 switch (sense_reason) {
1665 case TCM_NON_EXISTENT_LUN:
1666 case TCM_UNSUPPORTED_SCSI_OPCODE:
1667 case TCM_INVALID_CDB_FIELD:
1668 case TCM_INVALID_PARAMETER_LIST:
1669 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1670 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1671 case TCM_UNKNOWN_MODE_PAGE:
1672 case TCM_WRITE_PROTECTED:
1673 case TCM_ADDRESS_OUT_OF_RANGE:
1674 case TCM_CHECK_CONDITION_ABORT_CMD:
1675 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1676 case TCM_CHECK_CONDITION_NOT_READY:
1677 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1678 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1679 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1681 case TCM_OUT_OF_RESOURCES:
1682 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1684 case TCM_RESERVATION_CONFLICT:
1686 * No SENSE Data payload for this case, set SCSI Status
1687 * and queue the response to $FABRIC_MOD.
1689 * Uses linux/include/scsi/scsi.h SAM status codes defs
1691 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1693 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1694 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1697 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1700 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1701 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1702 cmd->orig_fe_lun, 0x2C,
1703 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1705 trace_target_cmd_complete(cmd);
1706 ret = cmd->se_tfo-> queue_status(cmd);
1707 if (ret == -EAGAIN || ret == -ENOMEM)
1711 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1712 cmd->t_task_cdb[0], sense_reason);
1713 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1717 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1718 if (ret == -EAGAIN || ret == -ENOMEM)
1722 transport_lun_remove_cmd(cmd);
1723 if (!transport_cmd_check_stop_to_fabric(cmd))
1728 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1729 transport_handle_queue_full(cmd, cmd->se_dev);
1731 EXPORT_SYMBOL(transport_generic_request_failure);
1733 void __target_execute_cmd(struct se_cmd *cmd)
1737 if (cmd->execute_cmd) {
1738 ret = cmd->execute_cmd(cmd);
1740 spin_lock_irq(&cmd->t_state_lock);
1741 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1742 spin_unlock_irq(&cmd->t_state_lock);
1744 transport_generic_request_failure(cmd, ret);
1749 static int target_write_prot_action(struct se_cmd *cmd)
1753 * Perform WRITE_INSERT of PI using software emulation when backend
1754 * device has PI enabled, if the transport has not already generated
1755 * PI using hardware WRITE_INSERT offload.
1757 switch (cmd->prot_op) {
1758 case TARGET_PROT_DOUT_INSERT:
1759 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1760 sbc_dif_generate(cmd);
1762 case TARGET_PROT_DOUT_STRIP:
1763 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1766 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
1767 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1768 sectors, 0, cmd->t_prot_sg, 0);
1769 if (unlikely(cmd->pi_err)) {
1770 spin_lock_irq(&cmd->t_state_lock);
1771 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1772 spin_unlock_irq(&cmd->t_state_lock);
1773 transport_generic_request_failure(cmd, cmd->pi_err);
1784 static bool target_handle_task_attr(struct se_cmd *cmd)
1786 struct se_device *dev = cmd->se_dev;
1788 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1792 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1793 * to allow the passed struct se_cmd list of tasks to the front of the list.
1795 switch (cmd->sam_task_attr) {
1797 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1798 "se_ordered_id: %u\n",
1799 cmd->t_task_cdb[0], cmd->se_ordered_id);
1801 case TCM_ORDERED_TAG:
1802 atomic_inc_mb(&dev->dev_ordered_sync);
1804 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1805 " se_ordered_id: %u\n",
1806 cmd->t_task_cdb[0], cmd->se_ordered_id);
1809 * Execute an ORDERED command if no other older commands
1810 * exist that need to be completed first.
1812 if (!atomic_read(&dev->simple_cmds))
1817 * For SIMPLE and UNTAGGED Task Attribute commands
1819 atomic_inc_mb(&dev->simple_cmds);
1823 if (atomic_read(&dev->dev_ordered_sync) == 0)
1826 spin_lock(&dev->delayed_cmd_lock);
1827 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1828 spin_unlock(&dev->delayed_cmd_lock);
1830 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1831 " delayed CMD list, se_ordered_id: %u\n",
1832 cmd->t_task_cdb[0], cmd->sam_task_attr,
1833 cmd->se_ordered_id);
1837 void target_execute_cmd(struct se_cmd *cmd)
1840 * If the received CDB has aleady been aborted stop processing it here.
1842 if (transport_check_aborted_status(cmd, 1))
1846 * Determine if frontend context caller is requesting the stopping of
1847 * this command for frontend exceptions.
1849 spin_lock_irq(&cmd->t_state_lock);
1850 if (cmd->transport_state & CMD_T_STOP) {
1851 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1853 cmd->se_tfo->get_task_tag(cmd));
1855 spin_unlock_irq(&cmd->t_state_lock);
1856 complete_all(&cmd->t_transport_stop_comp);
1860 cmd->t_state = TRANSPORT_PROCESSING;
1861 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1862 spin_unlock_irq(&cmd->t_state_lock);
1864 if (target_write_prot_action(cmd))
1867 if (target_handle_task_attr(cmd)) {
1868 spin_lock_irq(&cmd->t_state_lock);
1869 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1870 spin_unlock_irq(&cmd->t_state_lock);
1874 __target_execute_cmd(cmd);
1876 EXPORT_SYMBOL(target_execute_cmd);
1879 * Process all commands up to the last received ORDERED task attribute which
1880 * requires another blocking boundary
1882 static void target_restart_delayed_cmds(struct se_device *dev)
1887 spin_lock(&dev->delayed_cmd_lock);
1888 if (list_empty(&dev->delayed_cmd_list)) {
1889 spin_unlock(&dev->delayed_cmd_lock);
1893 cmd = list_entry(dev->delayed_cmd_list.next,
1894 struct se_cmd, se_delayed_node);
1895 list_del(&cmd->se_delayed_node);
1896 spin_unlock(&dev->delayed_cmd_lock);
1898 __target_execute_cmd(cmd);
1900 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
1906 * Called from I/O completion to determine which dormant/delayed
1907 * and ordered cmds need to have their tasks added to the execution queue.
1909 static void transport_complete_task_attr(struct se_cmd *cmd)
1911 struct se_device *dev = cmd->se_dev;
1913 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1916 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
1917 atomic_dec_mb(&dev->simple_cmds);
1918 dev->dev_cur_ordered_id++;
1919 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1920 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1921 cmd->se_ordered_id);
1922 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
1923 dev->dev_cur_ordered_id++;
1924 pr_debug("Incremented dev_cur_ordered_id: %u for"
1925 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1926 cmd->se_ordered_id);
1927 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
1928 atomic_dec_mb(&dev->dev_ordered_sync);
1930 dev->dev_cur_ordered_id++;
1931 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1932 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1935 target_restart_delayed_cmds(dev);
1938 static void transport_complete_qf(struct se_cmd *cmd)
1942 transport_complete_task_attr(cmd);
1944 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1945 trace_target_cmd_complete(cmd);
1946 ret = cmd->se_tfo->queue_status(cmd);
1950 switch (cmd->data_direction) {
1951 case DMA_FROM_DEVICE:
1952 trace_target_cmd_complete(cmd);
1953 ret = cmd->se_tfo->queue_data_in(cmd);
1956 if (cmd->se_cmd_flags & SCF_BIDI) {
1957 ret = cmd->se_tfo->queue_data_in(cmd);
1960 /* Fall through for DMA_TO_DEVICE */
1962 trace_target_cmd_complete(cmd);
1963 ret = cmd->se_tfo->queue_status(cmd);
1971 transport_handle_queue_full(cmd, cmd->se_dev);
1974 transport_lun_remove_cmd(cmd);
1975 transport_cmd_check_stop_to_fabric(cmd);
1978 static void transport_handle_queue_full(
1980 struct se_device *dev)
1982 spin_lock_irq(&dev->qf_cmd_lock);
1983 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1984 atomic_inc_mb(&dev->dev_qf_count);
1985 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1987 schedule_work(&cmd->se_dev->qf_work_queue);
1990 static bool target_read_prot_action(struct se_cmd *cmd)
1992 switch (cmd->prot_op) {
1993 case TARGET_PROT_DIN_STRIP:
1994 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
1995 u32 sectors = cmd->data_length >>
1996 ilog2(cmd->se_dev->dev_attrib.block_size);
1998 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1999 sectors, 0, cmd->t_prot_sg,
2005 case TARGET_PROT_DIN_INSERT:
2006 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2009 sbc_dif_generate(cmd);
2018 static void target_complete_ok_work(struct work_struct *work)
2020 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2024 * Check if we need to move delayed/dormant tasks from cmds on the
2025 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2028 transport_complete_task_attr(cmd);
2031 * Check to schedule QUEUE_FULL work, or execute an existing
2032 * cmd->transport_qf_callback()
2034 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2035 schedule_work(&cmd->se_dev->qf_work_queue);
2038 * Check if we need to send a sense buffer from
2039 * the struct se_cmd in question.
2041 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2042 WARN_ON(!cmd->scsi_status);
2043 ret = transport_send_check_condition_and_sense(
2045 if (ret == -EAGAIN || ret == -ENOMEM)
2048 transport_lun_remove_cmd(cmd);
2049 transport_cmd_check_stop_to_fabric(cmd);
2053 * Check for a callback, used by amongst other things
2054 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
2056 if (cmd->transport_complete_callback) {
2059 rc = cmd->transport_complete_callback(cmd, true);
2060 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
2061 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2067 ret = transport_send_check_condition_and_sense(cmd,
2069 if (ret == -EAGAIN || ret == -ENOMEM)
2072 transport_lun_remove_cmd(cmd);
2073 transport_cmd_check_stop_to_fabric(cmd);
2079 switch (cmd->data_direction) {
2080 case DMA_FROM_DEVICE:
2081 spin_lock(&cmd->se_lun->lun_sep_lock);
2082 if (cmd->se_lun->lun_sep) {
2083 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2086 spin_unlock(&cmd->se_lun->lun_sep_lock);
2088 * Perform READ_STRIP of PI using software emulation when
2089 * backend had PI enabled, if the transport will not be
2090 * performing hardware READ_STRIP offload.
2092 if (target_read_prot_action(cmd)) {
2093 ret = transport_send_check_condition_and_sense(cmd,
2095 if (ret == -EAGAIN || ret == -ENOMEM)
2098 transport_lun_remove_cmd(cmd);
2099 transport_cmd_check_stop_to_fabric(cmd);
2103 trace_target_cmd_complete(cmd);
2104 ret = cmd->se_tfo->queue_data_in(cmd);
2105 if (ret == -EAGAIN || ret == -ENOMEM)
2109 spin_lock(&cmd->se_lun->lun_sep_lock);
2110 if (cmd->se_lun->lun_sep) {
2111 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2114 spin_unlock(&cmd->se_lun->lun_sep_lock);
2116 * Check if we need to send READ payload for BIDI-COMMAND
2118 if (cmd->se_cmd_flags & SCF_BIDI) {
2119 spin_lock(&cmd->se_lun->lun_sep_lock);
2120 if (cmd->se_lun->lun_sep) {
2121 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2124 spin_unlock(&cmd->se_lun->lun_sep_lock);
2125 ret = cmd->se_tfo->queue_data_in(cmd);
2126 if (ret == -EAGAIN || ret == -ENOMEM)
2130 /* Fall through for DMA_TO_DEVICE */
2132 trace_target_cmd_complete(cmd);
2133 ret = cmd->se_tfo->queue_status(cmd);
2134 if (ret == -EAGAIN || ret == -ENOMEM)
2141 transport_lun_remove_cmd(cmd);
2142 transport_cmd_check_stop_to_fabric(cmd);
2146 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2147 " data_direction: %d\n", cmd, cmd->data_direction);
2148 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2149 transport_handle_queue_full(cmd, cmd->se_dev);
2152 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2154 struct scatterlist *sg;
2157 for_each_sg(sgl, sg, nents, count)
2158 __free_page(sg_page(sg));
2163 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2166 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2167 * emulation, and free + reset pointers if necessary..
2169 if (!cmd->t_data_sg_orig)
2172 kfree(cmd->t_data_sg);
2173 cmd->t_data_sg = cmd->t_data_sg_orig;
2174 cmd->t_data_sg_orig = NULL;
2175 cmd->t_data_nents = cmd->t_data_nents_orig;
2176 cmd->t_data_nents_orig = 0;
2179 static inline void transport_free_pages(struct se_cmd *cmd)
2181 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2183 * Release special case READ buffer payload required for
2184 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2186 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2187 transport_free_sgl(cmd->t_bidi_data_sg,
2188 cmd->t_bidi_data_nents);
2189 cmd->t_bidi_data_sg = NULL;
2190 cmd->t_bidi_data_nents = 0;
2192 transport_reset_sgl_orig(cmd);
2195 transport_reset_sgl_orig(cmd);
2197 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2198 cmd->t_data_sg = NULL;
2199 cmd->t_data_nents = 0;
2201 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2202 cmd->t_bidi_data_sg = NULL;
2203 cmd->t_bidi_data_nents = 0;
2205 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2206 cmd->t_prot_sg = NULL;
2207 cmd->t_prot_nents = 0;
2211 * transport_release_cmd - free a command
2212 * @cmd: command to free
2214 * This routine unconditionally frees a command, and reference counting
2215 * or list removal must be done in the caller.
2217 static int transport_release_cmd(struct se_cmd *cmd)
2219 BUG_ON(!cmd->se_tfo);
2221 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2222 core_tmr_release_req(cmd->se_tmr_req);
2223 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2224 kfree(cmd->t_task_cdb);
2226 * If this cmd has been setup with target_get_sess_cmd(), drop
2227 * the kref and call ->release_cmd() in kref callback.
2229 return target_put_sess_cmd(cmd);
2233 * transport_put_cmd - release a reference to a command
2234 * @cmd: command to release
2236 * This routine releases our reference to the command and frees it if possible.
2238 static int transport_put_cmd(struct se_cmd *cmd)
2240 transport_free_pages(cmd);
2241 return transport_release_cmd(cmd);
2244 void *transport_kmap_data_sg(struct se_cmd *cmd)
2246 struct scatterlist *sg = cmd->t_data_sg;
2247 struct page **pages;
2251 * We need to take into account a possible offset here for fabrics like
2252 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2253 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2255 if (!cmd->t_data_nents)
2259 if (cmd->t_data_nents == 1)
2260 return kmap(sg_page(sg)) + sg->offset;
2262 /* >1 page. use vmap */
2263 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2267 /* convert sg[] to pages[] */
2268 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2269 pages[i] = sg_page(sg);
2272 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2274 if (!cmd->t_data_vmap)
2277 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2279 EXPORT_SYMBOL(transport_kmap_data_sg);
2281 void transport_kunmap_data_sg(struct se_cmd *cmd)
2283 if (!cmd->t_data_nents) {
2285 } else if (cmd->t_data_nents == 1) {
2286 kunmap(sg_page(cmd->t_data_sg));
2290 vunmap(cmd->t_data_vmap);
2291 cmd->t_data_vmap = NULL;
2293 EXPORT_SYMBOL(transport_kunmap_data_sg);
2296 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2299 struct scatterlist *sg;
2301 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2305 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2306 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2310 sg_init_table(sg, nent);
2313 u32 page_len = min_t(u32, length, PAGE_SIZE);
2314 page = alloc_page(GFP_KERNEL | zero_flag);
2318 sg_set_page(&sg[i], page, page_len, 0);
2329 __free_page(sg_page(&sg[i]));
2336 * Allocate any required resources to execute the command. For writes we
2337 * might not have the payload yet, so notify the fabric via a call to
2338 * ->write_pending instead. Otherwise place it on the execution queue.
2341 transport_generic_new_cmd(struct se_cmd *cmd)
2344 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2347 * Determine is the TCM fabric module has already allocated physical
2348 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2351 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2354 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2355 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2358 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2359 bidi_length = cmd->t_task_nolb *
2360 cmd->se_dev->dev_attrib.block_size;
2362 bidi_length = cmd->data_length;
2364 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2365 &cmd->t_bidi_data_nents,
2366 bidi_length, zero_flag);
2368 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2371 if (cmd->prot_op != TARGET_PROT_NORMAL) {
2372 ret = target_alloc_sgl(&cmd->t_prot_sg,
2374 cmd->prot_length, true);
2376 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2379 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2380 cmd->data_length, zero_flag);
2382 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2383 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2386 * Special case for COMPARE_AND_WRITE with fabrics
2387 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2389 u32 caw_length = cmd->t_task_nolb *
2390 cmd->se_dev->dev_attrib.block_size;
2392 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2393 &cmd->t_bidi_data_nents,
2394 caw_length, zero_flag);
2396 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2399 * If this command is not a write we can execute it right here,
2400 * for write buffers we need to notify the fabric driver first
2401 * and let it call back once the write buffers are ready.
2403 target_add_to_state_list(cmd);
2404 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
2405 target_execute_cmd(cmd);
2408 transport_cmd_check_stop(cmd, false, true);
2410 ret = cmd->se_tfo->write_pending(cmd);
2411 if (ret == -EAGAIN || ret == -ENOMEM)
2414 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2417 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2420 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2421 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2422 transport_handle_queue_full(cmd, cmd->se_dev);
2425 EXPORT_SYMBOL(transport_generic_new_cmd);
2427 static void transport_write_pending_qf(struct se_cmd *cmd)
2431 ret = cmd->se_tfo->write_pending(cmd);
2432 if (ret == -EAGAIN || ret == -ENOMEM) {
2433 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2435 transport_handle_queue_full(cmd, cmd->se_dev);
2439 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2441 unsigned long flags;
2444 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2445 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2446 transport_wait_for_tasks(cmd);
2448 ret = transport_release_cmd(cmd);
2451 transport_wait_for_tasks(cmd);
2453 * Handle WRITE failure case where transport_generic_new_cmd()
2454 * has already added se_cmd to state_list, but fabric has
2455 * failed command before I/O submission.
2457 if (cmd->state_active) {
2458 spin_lock_irqsave(&cmd->t_state_lock, flags);
2459 target_remove_from_state_list(cmd);
2460 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2464 transport_lun_remove_cmd(cmd);
2466 ret = transport_put_cmd(cmd);
2470 EXPORT_SYMBOL(transport_generic_free_cmd);
2472 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2473 * @se_cmd: command descriptor to add
2474 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2476 int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
2478 struct se_session *se_sess = se_cmd->se_sess;
2479 unsigned long flags;
2483 * Add a second kref if the fabric caller is expecting to handle
2484 * fabric acknowledgement that requires two target_put_sess_cmd()
2485 * invocations before se_cmd descriptor release.
2488 kref_get(&se_cmd->cmd_kref);
2490 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2491 if (se_sess->sess_tearing_down) {
2495 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2497 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2499 if (ret && ack_kref)
2500 target_put_sess_cmd(se_cmd);
2504 EXPORT_SYMBOL(target_get_sess_cmd);
2506 static void target_release_cmd_kref(struct kref *kref)
2507 __releases(&se_cmd->se_sess->sess_cmd_lock)
2509 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2510 struct se_session *se_sess = se_cmd->se_sess;
2512 if (list_empty(&se_cmd->se_cmd_list)) {
2513 spin_unlock(&se_sess->sess_cmd_lock);
2514 se_cmd->se_tfo->release_cmd(se_cmd);
2517 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2518 spin_unlock(&se_sess->sess_cmd_lock);
2519 complete(&se_cmd->cmd_wait_comp);
2522 list_del(&se_cmd->se_cmd_list);
2523 spin_unlock(&se_sess->sess_cmd_lock);
2525 se_cmd->se_tfo->release_cmd(se_cmd);
2528 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2529 * @se_cmd: command descriptor to drop
2531 int target_put_sess_cmd(struct se_cmd *se_cmd)
2533 struct se_session *se_sess = se_cmd->se_sess;
2536 se_cmd->se_tfo->release_cmd(se_cmd);
2539 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2540 &se_sess->sess_cmd_lock);
2542 EXPORT_SYMBOL(target_put_sess_cmd);
2544 /* target_sess_cmd_list_set_waiting - Flag all commands in
2545 * sess_cmd_list to complete cmd_wait_comp. Set
2546 * sess_tearing_down so no more commands are queued.
2547 * @se_sess: session to flag
2549 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2551 struct se_cmd *se_cmd;
2552 unsigned long flags;
2554 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2555 if (se_sess->sess_tearing_down) {
2556 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2559 se_sess->sess_tearing_down = 1;
2560 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2562 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2563 se_cmd->cmd_wait_set = 1;
2565 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2567 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2569 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2570 * @se_sess: session to wait for active I/O
2572 void target_wait_for_sess_cmds(struct se_session *se_sess)
2574 struct se_cmd *se_cmd, *tmp_cmd;
2575 unsigned long flags;
2577 list_for_each_entry_safe(se_cmd, tmp_cmd,
2578 &se_sess->sess_wait_list, se_cmd_list) {
2579 list_del(&se_cmd->se_cmd_list);
2581 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2582 " %d\n", se_cmd, se_cmd->t_state,
2583 se_cmd->se_tfo->get_cmd_state(se_cmd));
2585 wait_for_completion(&se_cmd->cmd_wait_comp);
2586 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2587 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2588 se_cmd->se_tfo->get_cmd_state(se_cmd));
2590 se_cmd->se_tfo->release_cmd(se_cmd);
2593 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2594 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2595 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2598 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2600 static int transport_clear_lun_ref_thread(void *p)
2602 struct se_lun *lun = p;
2604 percpu_ref_kill(&lun->lun_ref);
2606 wait_for_completion(&lun->lun_ref_comp);
2607 complete(&lun->lun_shutdown_comp);
2612 int transport_clear_lun_ref(struct se_lun *lun)
2614 struct task_struct *kt;
2616 kt = kthread_run(transport_clear_lun_ref_thread, lun,
2617 "tcm_cl_%u", lun->unpacked_lun);
2619 pr_err("Unable to start clear_lun thread\n");
2622 wait_for_completion(&lun->lun_shutdown_comp);
2628 * transport_wait_for_tasks - wait for completion to occur
2629 * @cmd: command to wait
2631 * Called from frontend fabric context to wait for storage engine
2632 * to pause and/or release frontend generated struct se_cmd.
2634 bool transport_wait_for_tasks(struct se_cmd *cmd)
2636 unsigned long flags;
2638 spin_lock_irqsave(&cmd->t_state_lock, flags);
2639 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2640 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2641 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2645 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2646 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2647 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2651 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2652 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2656 cmd->transport_state |= CMD_T_STOP;
2658 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2659 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2660 cmd, cmd->se_tfo->get_task_tag(cmd),
2661 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2663 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2665 wait_for_completion(&cmd->t_transport_stop_comp);
2667 spin_lock_irqsave(&cmd->t_state_lock, flags);
2668 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2670 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2671 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2672 cmd->se_tfo->get_task_tag(cmd));
2674 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2678 EXPORT_SYMBOL(transport_wait_for_tasks);
2680 static int transport_get_sense_codes(
2685 *asc = cmd->scsi_asc;
2686 *ascq = cmd->scsi_ascq;
2692 void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2694 /* Place failed LBA in sense data information descriptor 0. */
2695 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2696 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2697 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2698 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2700 /* Descriptor Information: failing sector */
2701 put_unaligned_be64(bad_sector, &buffer[12]);
2705 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2706 sense_reason_t reason, int from_transport)
2708 unsigned char *buffer = cmd->sense_buffer;
2709 unsigned long flags;
2710 u8 asc = 0, ascq = 0;
2712 spin_lock_irqsave(&cmd->t_state_lock, flags);
2713 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2717 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2718 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2720 if (!reason && from_transport)
2723 if (!from_transport)
2724 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2727 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2728 * SENSE KEY values from include/scsi/scsi.h
2734 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2736 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2737 /* NO ADDITIONAL SENSE INFORMATION */
2738 buffer[SPC_ASC_KEY_OFFSET] = 0;
2739 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2741 case TCM_NON_EXISTENT_LUN:
2744 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2745 /* ILLEGAL REQUEST */
2746 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2747 /* LOGICAL UNIT NOT SUPPORTED */
2748 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2750 case TCM_UNSUPPORTED_SCSI_OPCODE:
2751 case TCM_SECTOR_COUNT_TOO_MANY:
2754 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2755 /* ILLEGAL REQUEST */
2756 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2757 /* INVALID COMMAND OPERATION CODE */
2758 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2760 case TCM_UNKNOWN_MODE_PAGE:
2763 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2764 /* ILLEGAL REQUEST */
2765 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2766 /* INVALID FIELD IN CDB */
2767 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2769 case TCM_CHECK_CONDITION_ABORT_CMD:
2772 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2773 /* ABORTED COMMAND */
2774 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2775 /* BUS DEVICE RESET FUNCTION OCCURRED */
2776 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2777 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2779 case TCM_INCORRECT_AMOUNT_OF_DATA:
2782 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2783 /* ABORTED COMMAND */
2784 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2786 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2787 /* NOT ENOUGH UNSOLICITED DATA */
2788 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2790 case TCM_INVALID_CDB_FIELD:
2793 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2794 /* ILLEGAL REQUEST */
2795 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2796 /* INVALID FIELD IN CDB */
2797 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2799 case TCM_INVALID_PARAMETER_LIST:
2802 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2803 /* ILLEGAL REQUEST */
2804 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2805 /* INVALID FIELD IN PARAMETER LIST */
2806 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2808 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2811 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2812 /* ILLEGAL REQUEST */
2813 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2814 /* PARAMETER LIST LENGTH ERROR */
2815 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2817 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2820 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2821 /* ABORTED COMMAND */
2822 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2824 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2825 /* UNEXPECTED_UNSOLICITED_DATA */
2826 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2828 case TCM_SERVICE_CRC_ERROR:
2831 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2832 /* ABORTED COMMAND */
2833 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2834 /* PROTOCOL SERVICE CRC ERROR */
2835 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2837 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2839 case TCM_SNACK_REJECTED:
2842 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2843 /* ABORTED COMMAND */
2844 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2846 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2847 /* FAILED RETRANSMISSION REQUEST */
2848 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2850 case TCM_WRITE_PROTECTED:
2853 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2855 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2856 /* WRITE PROTECTED */
2857 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2859 case TCM_ADDRESS_OUT_OF_RANGE:
2862 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2863 /* ILLEGAL REQUEST */
2864 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2865 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2866 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2868 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2871 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2872 /* UNIT ATTENTION */
2873 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2874 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2875 buffer[SPC_ASC_KEY_OFFSET] = asc;
2876 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2878 case TCM_CHECK_CONDITION_NOT_READY:
2881 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2883 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2884 transport_get_sense_codes(cmd, &asc, &ascq);
2885 buffer[SPC_ASC_KEY_OFFSET] = asc;
2886 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2888 case TCM_MISCOMPARE_VERIFY:
2891 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2892 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2893 /* MISCOMPARE DURING VERIFY OPERATION */
2894 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2895 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2897 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2900 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2901 /* ILLEGAL REQUEST */
2902 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2903 /* LOGICAL BLOCK GUARD CHECK FAILED */
2904 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2905 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
2906 transport_err_sector_info(buffer, cmd->bad_sector);
2908 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2911 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2912 /* ILLEGAL REQUEST */
2913 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2914 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2915 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2916 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
2917 transport_err_sector_info(buffer, cmd->bad_sector);
2919 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2922 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2923 /* ILLEGAL REQUEST */
2924 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2925 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2926 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2927 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2928 transport_err_sector_info(buffer, cmd->bad_sector);
2930 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2934 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2936 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2937 * Solaris initiators. Returning NOT READY instead means the
2938 * operations will be retried a finite number of times and we
2939 * can survive intermittent errors.
2941 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2942 /* LOGICAL UNIT COMMUNICATION FAILURE */
2943 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2947 * This code uses linux/include/scsi/scsi.h SAM status codes!
2949 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2951 * Automatically padded, this value is encoded in the fabric's
2952 * data_length response PDU containing the SCSI defined sense data.
2954 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2957 trace_target_cmd_complete(cmd);
2958 return cmd->se_tfo->queue_status(cmd);
2960 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2962 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2964 if (!(cmd->transport_state & CMD_T_ABORTED))
2968 * If cmd has been aborted but either no status is to be sent or it has
2969 * already been sent, just return
2971 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
2974 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2975 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
2977 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
2978 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2979 trace_target_cmd_complete(cmd);
2980 cmd->se_tfo->queue_status(cmd);
2984 EXPORT_SYMBOL(transport_check_aborted_status);
2986 void transport_send_task_abort(struct se_cmd *cmd)
2988 unsigned long flags;
2990 spin_lock_irqsave(&cmd->t_state_lock, flags);
2991 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
2992 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2995 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2998 * If there are still expected incoming fabric WRITEs, we wait
2999 * until until they have completed before sending a TASK_ABORTED
3000 * response. This response with TASK_ABORTED status will be
3001 * queued back to fabric module by transport_check_aborted_status().
3003 if (cmd->data_direction == DMA_TO_DEVICE) {
3004 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3005 cmd->transport_state |= CMD_T_ABORTED;
3006 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
3010 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3012 transport_lun_remove_cmd(cmd);
3014 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3015 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3016 cmd->se_tfo->get_task_tag(cmd));
3018 trace_target_cmd_complete(cmd);
3019 cmd->se_tfo->queue_status(cmd);
3022 static void target_tmr_work(struct work_struct *work)
3024 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3025 struct se_device *dev = cmd->se_dev;
3026 struct se_tmr_req *tmr = cmd->se_tmr_req;
3029 switch (tmr->function) {
3030 case TMR_ABORT_TASK:
3031 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3033 case TMR_ABORT_TASK_SET:
3035 case TMR_CLEAR_TASK_SET:
3036 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3039 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3040 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3041 TMR_FUNCTION_REJECTED;
3043 case TMR_TARGET_WARM_RESET:
3044 tmr->response = TMR_FUNCTION_REJECTED;
3046 case TMR_TARGET_COLD_RESET:
3047 tmr->response = TMR_FUNCTION_REJECTED;
3050 pr_err("Uknown TMR function: 0x%02x.\n",
3052 tmr->response = TMR_FUNCTION_REJECTED;
3056 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3057 cmd->se_tfo->queue_tm_rsp(cmd);
3059 transport_cmd_check_stop_to_fabric(cmd);
3062 int transport_generic_handle_tmr(
3065 unsigned long flags;
3067 spin_lock_irqsave(&cmd->t_state_lock, flags);
3068 cmd->transport_state |= CMD_T_ACTIVE;
3069 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3071 INIT_WORK(&cmd->work, target_tmr_work);
3072 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3075 EXPORT_SYMBOL(transport_generic_handle_tmr);
3078 target_check_wce(struct se_device *dev)
3082 if (dev->transport->get_write_cache)
3083 wce = dev->transport->get_write_cache(dev);
3084 else if (dev->dev_attrib.emulate_write_cache > 0)
3091 target_check_fua(struct se_device *dev)
3093 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;