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 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 * Determine if fabric allows for T10-PI feature bits to be exposed
332 * to initiators for device backends with !dev->dev_attrib.pi_prot_type
334 if (tfo->tpg_check_prot_fabric_only)
335 se_sess->sess_prot_type = tfo->tpg_check_prot_fabric_only(se_tpg);
338 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
340 * Only set for struct se_session's that will actually be moving I/O.
341 * eg: *NOT* discovery sessions.
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]);
354 kref_get(&se_nacl->acl_kref);
356 spin_lock_irq(&se_nacl->nacl_sess_lock);
358 * The se_nacl->nacl_sess pointer will be set to the
359 * last active I_T Nexus for each struct se_node_acl.
361 se_nacl->nacl_sess = se_sess;
363 list_add_tail(&se_sess->sess_acl_list,
364 &se_nacl->acl_sess_list);
365 spin_unlock_irq(&se_nacl->nacl_sess_lock);
367 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
369 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
370 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
372 EXPORT_SYMBOL(__transport_register_session);
374 void transport_register_session(
375 struct se_portal_group *se_tpg,
376 struct se_node_acl *se_nacl,
377 struct se_session *se_sess,
378 void *fabric_sess_ptr)
382 spin_lock_irqsave(&se_tpg->session_lock, flags);
383 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
384 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
386 EXPORT_SYMBOL(transport_register_session);
388 static void target_release_session(struct kref *kref)
390 struct se_session *se_sess = container_of(kref,
391 struct se_session, sess_kref);
392 struct se_portal_group *se_tpg = se_sess->se_tpg;
394 se_tpg->se_tpg_tfo->close_session(se_sess);
397 void target_get_session(struct se_session *se_sess)
399 kref_get(&se_sess->sess_kref);
401 EXPORT_SYMBOL(target_get_session);
403 void target_put_session(struct se_session *se_sess)
405 struct se_portal_group *tpg = se_sess->se_tpg;
407 if (tpg->se_tpg_tfo->put_session != NULL) {
408 tpg->se_tpg_tfo->put_session(se_sess);
411 kref_put(&se_sess->sess_kref, target_release_session);
413 EXPORT_SYMBOL(target_put_session);
415 ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
417 struct se_session *se_sess;
420 spin_lock_bh(&se_tpg->session_lock);
421 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
422 if (!se_sess->se_node_acl)
424 if (!se_sess->se_node_acl->dynamic_node_acl)
426 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
429 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
430 se_sess->se_node_acl->initiatorname);
431 len += 1; /* Include NULL terminator */
433 spin_unlock_bh(&se_tpg->session_lock);
437 EXPORT_SYMBOL(target_show_dynamic_sessions);
439 static void target_complete_nacl(struct kref *kref)
441 struct se_node_acl *nacl = container_of(kref,
442 struct se_node_acl, acl_kref);
444 complete(&nacl->acl_free_comp);
447 void target_put_nacl(struct se_node_acl *nacl)
449 kref_put(&nacl->acl_kref, target_complete_nacl);
452 void transport_deregister_session_configfs(struct se_session *se_sess)
454 struct se_node_acl *se_nacl;
457 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
459 se_nacl = se_sess->se_node_acl;
461 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
462 if (se_nacl->acl_stop == 0)
463 list_del(&se_sess->sess_acl_list);
465 * If the session list is empty, then clear the pointer.
466 * Otherwise, set the struct se_session pointer from the tail
467 * element of the per struct se_node_acl active session list.
469 if (list_empty(&se_nacl->acl_sess_list))
470 se_nacl->nacl_sess = NULL;
472 se_nacl->nacl_sess = container_of(
473 se_nacl->acl_sess_list.prev,
474 struct se_session, sess_acl_list);
476 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
479 EXPORT_SYMBOL(transport_deregister_session_configfs);
481 void transport_free_session(struct se_session *se_sess)
483 if (se_sess->sess_cmd_map) {
484 percpu_ida_destroy(&se_sess->sess_tag_pool);
485 if (is_vmalloc_addr(se_sess->sess_cmd_map))
486 vfree(se_sess->sess_cmd_map);
488 kfree(se_sess->sess_cmd_map);
490 kmem_cache_free(se_sess_cache, se_sess);
492 EXPORT_SYMBOL(transport_free_session);
494 void transport_deregister_session(struct se_session *se_sess)
496 struct se_portal_group *se_tpg = se_sess->se_tpg;
497 struct target_core_fabric_ops *se_tfo;
498 struct se_node_acl *se_nacl;
500 bool comp_nacl = true;
503 transport_free_session(se_sess);
506 se_tfo = se_tpg->se_tpg_tfo;
508 spin_lock_irqsave(&se_tpg->session_lock, flags);
509 list_del(&se_sess->sess_list);
510 se_sess->se_tpg = NULL;
511 se_sess->fabric_sess_ptr = NULL;
512 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
515 * Determine if we need to do extra work for this initiator node's
516 * struct se_node_acl if it had been previously dynamically generated.
518 se_nacl = se_sess->se_node_acl;
520 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
521 if (se_nacl && se_nacl->dynamic_node_acl) {
522 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
523 list_del(&se_nacl->acl_list);
524 se_tpg->num_node_acls--;
525 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
526 core_tpg_wait_for_nacl_pr_ref(se_nacl);
527 core_free_device_list_for_node(se_nacl, se_tpg);
528 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
531 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
534 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
536 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
537 se_tpg->se_tpg_tfo->get_fabric_name());
539 * If last kref is dropping now for an explicit NodeACL, awake sleeping
540 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
543 if (se_nacl && comp_nacl)
544 target_put_nacl(se_nacl);
546 transport_free_session(se_sess);
548 EXPORT_SYMBOL(transport_deregister_session);
551 * Called with cmd->t_state_lock held.
553 static void target_remove_from_state_list(struct se_cmd *cmd)
555 struct se_device *dev = cmd->se_dev;
561 if (cmd->transport_state & CMD_T_BUSY)
564 spin_lock_irqsave(&dev->execute_task_lock, flags);
565 if (cmd->state_active) {
566 list_del(&cmd->state_list);
567 cmd->state_active = false;
569 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
572 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
577 spin_lock_irqsave(&cmd->t_state_lock, flags);
579 cmd->t_state = TRANSPORT_WRITE_PENDING;
581 if (remove_from_lists) {
582 target_remove_from_state_list(cmd);
585 * Clear struct se_cmd->se_lun before the handoff to FE.
591 * Determine if frontend context caller is requesting the stopping of
592 * this command for frontend exceptions.
594 if (cmd->transport_state & CMD_T_STOP) {
595 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
597 cmd->se_tfo->get_task_tag(cmd));
599 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
601 complete_all(&cmd->t_transport_stop_comp);
605 cmd->transport_state &= ~CMD_T_ACTIVE;
606 if (remove_from_lists) {
608 * Some fabric modules like tcm_loop can release
609 * their internally allocated I/O reference now and
612 * Fabric modules are expected to return '1' here if the
613 * se_cmd being passed is released at this point,
614 * or zero if not being released.
616 if (cmd->se_tfo->check_stop_free != NULL) {
617 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
618 return cmd->se_tfo->check_stop_free(cmd);
622 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
626 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
628 return transport_cmd_check_stop(cmd, true, false);
631 static void transport_lun_remove_cmd(struct se_cmd *cmd)
633 struct se_lun *lun = cmd->se_lun;
638 if (cmpxchg(&cmd->lun_ref_active, true, false))
639 percpu_ref_put(&lun->lun_ref);
642 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
644 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
645 transport_lun_remove_cmd(cmd);
647 * Allow the fabric driver to unmap any resources before
648 * releasing the descriptor via TFO->release_cmd()
651 cmd->se_tfo->aborted_task(cmd);
653 if (transport_cmd_check_stop_to_fabric(cmd))
656 transport_put_cmd(cmd);
659 static void target_complete_failure_work(struct work_struct *work)
661 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
663 transport_generic_request_failure(cmd,
664 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
668 * Used when asking transport to copy Sense Data from the underlying
669 * Linux/SCSI struct scsi_cmnd
671 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
673 struct se_device *dev = cmd->se_dev;
675 WARN_ON(!cmd->se_lun);
680 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
683 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
685 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
686 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
687 return cmd->sense_buffer;
690 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
692 struct se_device *dev = cmd->se_dev;
693 int success = scsi_status == GOOD;
696 cmd->scsi_status = scsi_status;
699 spin_lock_irqsave(&cmd->t_state_lock, flags);
700 cmd->transport_state &= ~CMD_T_BUSY;
702 if (dev && dev->transport->transport_complete) {
703 dev->transport->transport_complete(cmd,
705 transport_get_sense_buffer(cmd));
706 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
711 * See if we are waiting to complete for an exception condition.
713 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
715 complete(&cmd->task_stop_comp);
720 * Check for case where an explicit ABORT_TASK has been received
721 * and transport_wait_for_tasks() will be waiting for completion..
723 if (cmd->transport_state & CMD_T_ABORTED &&
724 cmd->transport_state & CMD_T_STOP) {
725 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
726 complete_all(&cmd->t_transport_stop_comp);
728 } else if (!success) {
729 INIT_WORK(&cmd->work, target_complete_failure_work);
731 INIT_WORK(&cmd->work, target_complete_ok_work);
734 cmd->t_state = TRANSPORT_COMPLETE;
735 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
736 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
738 queue_work(target_completion_wq, &cmd->work);
740 EXPORT_SYMBOL(target_complete_cmd);
742 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
744 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
745 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
746 cmd->residual_count += cmd->data_length - length;
748 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
749 cmd->residual_count = cmd->data_length - length;
752 cmd->data_length = length;
755 target_complete_cmd(cmd, scsi_status);
757 EXPORT_SYMBOL(target_complete_cmd_with_length);
759 static void target_add_to_state_list(struct se_cmd *cmd)
761 struct se_device *dev = cmd->se_dev;
764 spin_lock_irqsave(&dev->execute_task_lock, flags);
765 if (!cmd->state_active) {
766 list_add_tail(&cmd->state_list, &dev->state_list);
767 cmd->state_active = true;
769 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
773 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
775 static void transport_write_pending_qf(struct se_cmd *cmd);
776 static void transport_complete_qf(struct se_cmd *cmd);
778 void target_qf_do_work(struct work_struct *work)
780 struct se_device *dev = container_of(work, struct se_device,
782 LIST_HEAD(qf_cmd_list);
783 struct se_cmd *cmd, *cmd_tmp;
785 spin_lock_irq(&dev->qf_cmd_lock);
786 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
787 spin_unlock_irq(&dev->qf_cmd_lock);
789 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
790 list_del(&cmd->se_qf_node);
791 atomic_dec_mb(&dev->dev_qf_count);
793 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
794 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
795 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
796 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
799 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
800 transport_write_pending_qf(cmd);
801 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
802 transport_complete_qf(cmd);
806 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
808 switch (cmd->data_direction) {
811 case DMA_FROM_DEVICE:
815 case DMA_BIDIRECTIONAL:
824 void transport_dump_dev_state(
825 struct se_device *dev,
829 *bl += sprintf(b + *bl, "Status: ");
830 if (dev->export_count)
831 *bl += sprintf(b + *bl, "ACTIVATED");
833 *bl += sprintf(b + *bl, "DEACTIVATED");
835 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
836 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
837 dev->dev_attrib.block_size,
838 dev->dev_attrib.hw_max_sectors);
839 *bl += sprintf(b + *bl, " ");
842 void transport_dump_vpd_proto_id(
844 unsigned char *p_buf,
847 unsigned char buf[VPD_TMP_BUF_SIZE];
850 memset(buf, 0, VPD_TMP_BUF_SIZE);
851 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
853 switch (vpd->protocol_identifier) {
855 sprintf(buf+len, "Fibre Channel\n");
858 sprintf(buf+len, "Parallel SCSI\n");
861 sprintf(buf+len, "SSA\n");
864 sprintf(buf+len, "IEEE 1394\n");
867 sprintf(buf+len, "SCSI Remote Direct Memory Access"
871 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
874 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
877 sprintf(buf+len, "Automation/Drive Interface Transport"
881 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
884 sprintf(buf+len, "Unknown 0x%02x\n",
885 vpd->protocol_identifier);
890 strncpy(p_buf, buf, p_buf_len);
896 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
899 * Check if the Protocol Identifier Valid (PIV) bit is set..
901 * from spc3r23.pdf section 7.5.1
903 if (page_83[1] & 0x80) {
904 vpd->protocol_identifier = (page_83[0] & 0xf0);
905 vpd->protocol_identifier_set = 1;
906 transport_dump_vpd_proto_id(vpd, NULL, 0);
909 EXPORT_SYMBOL(transport_set_vpd_proto_id);
911 int transport_dump_vpd_assoc(
913 unsigned char *p_buf,
916 unsigned char buf[VPD_TMP_BUF_SIZE];
920 memset(buf, 0, VPD_TMP_BUF_SIZE);
921 len = sprintf(buf, "T10 VPD Identifier Association: ");
923 switch (vpd->association) {
925 sprintf(buf+len, "addressed logical unit\n");
928 sprintf(buf+len, "target port\n");
931 sprintf(buf+len, "SCSI target device\n");
934 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
940 strncpy(p_buf, buf, p_buf_len);
947 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
950 * The VPD identification association..
952 * from spc3r23.pdf Section 7.6.3.1 Table 297
954 vpd->association = (page_83[1] & 0x30);
955 return transport_dump_vpd_assoc(vpd, NULL, 0);
957 EXPORT_SYMBOL(transport_set_vpd_assoc);
959 int transport_dump_vpd_ident_type(
961 unsigned char *p_buf,
964 unsigned char buf[VPD_TMP_BUF_SIZE];
968 memset(buf, 0, VPD_TMP_BUF_SIZE);
969 len = sprintf(buf, "T10 VPD Identifier Type: ");
971 switch (vpd->device_identifier_type) {
973 sprintf(buf+len, "Vendor specific\n");
976 sprintf(buf+len, "T10 Vendor ID based\n");
979 sprintf(buf+len, "EUI-64 based\n");
982 sprintf(buf+len, "NAA\n");
985 sprintf(buf+len, "Relative target port identifier\n");
988 sprintf(buf+len, "SCSI name string\n");
991 sprintf(buf+len, "Unsupported: 0x%02x\n",
992 vpd->device_identifier_type);
998 if (p_buf_len < strlen(buf)+1)
1000 strncpy(p_buf, buf, p_buf_len);
1002 pr_debug("%s", buf);
1008 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1011 * The VPD identifier type..
1013 * from spc3r23.pdf Section 7.6.3.1 Table 298
1015 vpd->device_identifier_type = (page_83[1] & 0x0f);
1016 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1018 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1020 int transport_dump_vpd_ident(
1021 struct t10_vpd *vpd,
1022 unsigned char *p_buf,
1025 unsigned char buf[VPD_TMP_BUF_SIZE];
1028 memset(buf, 0, VPD_TMP_BUF_SIZE);
1030 switch (vpd->device_identifier_code_set) {
1031 case 0x01: /* Binary */
1032 snprintf(buf, sizeof(buf),
1033 "T10 VPD Binary Device Identifier: %s\n",
1034 &vpd->device_identifier[0]);
1036 case 0x02: /* ASCII */
1037 snprintf(buf, sizeof(buf),
1038 "T10 VPD ASCII Device Identifier: %s\n",
1039 &vpd->device_identifier[0]);
1041 case 0x03: /* UTF-8 */
1042 snprintf(buf, sizeof(buf),
1043 "T10 VPD UTF-8 Device Identifier: %s\n",
1044 &vpd->device_identifier[0]);
1047 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1048 " 0x%02x", vpd->device_identifier_code_set);
1054 strncpy(p_buf, buf, p_buf_len);
1056 pr_debug("%s", buf);
1062 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1064 static const char hex_str[] = "0123456789abcdef";
1065 int j = 0, i = 4; /* offset to start of the identifier */
1068 * The VPD Code Set (encoding)
1070 * from spc3r23.pdf Section 7.6.3.1 Table 296
1072 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1073 switch (vpd->device_identifier_code_set) {
1074 case 0x01: /* Binary */
1075 vpd->device_identifier[j++] =
1076 hex_str[vpd->device_identifier_type];
1077 while (i < (4 + page_83[3])) {
1078 vpd->device_identifier[j++] =
1079 hex_str[(page_83[i] & 0xf0) >> 4];
1080 vpd->device_identifier[j++] =
1081 hex_str[page_83[i] & 0x0f];
1085 case 0x02: /* ASCII */
1086 case 0x03: /* UTF-8 */
1087 while (i < (4 + page_83[3]))
1088 vpd->device_identifier[j++] = page_83[i++];
1094 return transport_dump_vpd_ident(vpd, NULL, 0);
1096 EXPORT_SYMBOL(transport_set_vpd_ident);
1099 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1101 struct se_device *dev = cmd->se_dev;
1103 if (cmd->unknown_data_length) {
1104 cmd->data_length = size;
1105 } else if (size != cmd->data_length) {
1106 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1107 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1108 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1109 cmd->data_length, size, cmd->t_task_cdb[0]);
1111 if (cmd->data_direction == DMA_TO_DEVICE) {
1112 pr_err("Rejecting underflow/overflow"
1114 return TCM_INVALID_CDB_FIELD;
1117 * Reject READ_* or WRITE_* with overflow/underflow for
1118 * type SCF_SCSI_DATA_CDB.
1120 if (dev->dev_attrib.block_size != 512) {
1121 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1122 " CDB on non 512-byte sector setup subsystem"
1123 " plugin: %s\n", dev->transport->name);
1124 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1125 return TCM_INVALID_CDB_FIELD;
1128 * For the overflow case keep the existing fabric provided
1129 * ->data_length. Otherwise for the underflow case, reset
1130 * ->data_length to the smaller SCSI expected data transfer
1133 if (size > cmd->data_length) {
1134 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1135 cmd->residual_count = (size - cmd->data_length);
1137 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1138 cmd->residual_count = (cmd->data_length - size);
1139 cmd->data_length = size;
1148 * Used by fabric modules containing a local struct se_cmd within their
1149 * fabric dependent per I/O descriptor.
1151 void transport_init_se_cmd(
1153 struct target_core_fabric_ops *tfo,
1154 struct se_session *se_sess,
1158 unsigned char *sense_buffer)
1160 INIT_LIST_HEAD(&cmd->se_delayed_node);
1161 INIT_LIST_HEAD(&cmd->se_qf_node);
1162 INIT_LIST_HEAD(&cmd->se_cmd_list);
1163 INIT_LIST_HEAD(&cmd->state_list);
1164 init_completion(&cmd->t_transport_stop_comp);
1165 init_completion(&cmd->cmd_wait_comp);
1166 init_completion(&cmd->task_stop_comp);
1167 spin_lock_init(&cmd->t_state_lock);
1168 kref_init(&cmd->cmd_kref);
1169 cmd->transport_state = CMD_T_DEV_ACTIVE;
1172 cmd->se_sess = se_sess;
1173 cmd->data_length = data_length;
1174 cmd->data_direction = data_direction;
1175 cmd->sam_task_attr = task_attr;
1176 cmd->sense_buffer = sense_buffer;
1178 cmd->state_active = false;
1180 EXPORT_SYMBOL(transport_init_se_cmd);
1182 static sense_reason_t
1183 transport_check_alloc_task_attr(struct se_cmd *cmd)
1185 struct se_device *dev = cmd->se_dev;
1188 * Check if SAM Task Attribute emulation is enabled for this
1189 * struct se_device storage object
1191 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1194 if (cmd->sam_task_attr == TCM_ACA_TAG) {
1195 pr_debug("SAM Task Attribute ACA"
1196 " emulation is not supported\n");
1197 return TCM_INVALID_CDB_FIELD;
1200 * Used to determine when ORDERED commands should go from
1201 * Dormant to Active status.
1203 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1204 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1205 cmd->se_ordered_id, cmd->sam_task_attr,
1206 dev->transport->name);
1211 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1213 struct se_device *dev = cmd->se_dev;
1217 * Ensure that the received CDB is less than the max (252 + 8) bytes
1218 * for VARIABLE_LENGTH_CMD
1220 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1221 pr_err("Received SCSI CDB with command_size: %d that"
1222 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1223 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1224 return TCM_INVALID_CDB_FIELD;
1227 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1228 * allocate the additional extended CDB buffer now.. Otherwise
1229 * setup the pointer from __t_task_cdb to t_task_cdb.
1231 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1232 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1234 if (!cmd->t_task_cdb) {
1235 pr_err("Unable to allocate cmd->t_task_cdb"
1236 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1237 scsi_command_size(cdb),
1238 (unsigned long)sizeof(cmd->__t_task_cdb));
1239 return TCM_OUT_OF_RESOURCES;
1242 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1244 * Copy the original CDB into cmd->
1246 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1248 trace_target_sequencer_start(cmd);
1251 * Check for an existing UNIT ATTENTION condition
1253 ret = target_scsi3_ua_check(cmd);
1257 ret = target_alua_state_check(cmd);
1261 ret = target_check_reservation(cmd);
1263 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1267 ret = dev->transport->parse_cdb(cmd);
1271 ret = transport_check_alloc_task_attr(cmd);
1275 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1277 spin_lock(&cmd->se_lun->lun_sep_lock);
1278 if (cmd->se_lun->lun_sep)
1279 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1280 spin_unlock(&cmd->se_lun->lun_sep_lock);
1283 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1286 * Used by fabric module frontends to queue tasks directly.
1287 * Many only be used from process context only
1289 int transport_handle_cdb_direct(
1296 pr_err("cmd->se_lun is NULL\n");
1299 if (in_interrupt()) {
1301 pr_err("transport_generic_handle_cdb cannot be called"
1302 " from interrupt context\n");
1306 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1307 * outstanding descriptors are handled correctly during shutdown via
1308 * transport_wait_for_tasks()
1310 * Also, we don't take cmd->t_state_lock here as we only expect
1311 * this to be called for initial descriptor submission.
1313 cmd->t_state = TRANSPORT_NEW_CMD;
1314 cmd->transport_state |= CMD_T_ACTIVE;
1317 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1318 * so follow TRANSPORT_NEW_CMD processing thread context usage
1319 * and call transport_generic_request_failure() if necessary..
1321 ret = transport_generic_new_cmd(cmd);
1323 transport_generic_request_failure(cmd, ret);
1326 EXPORT_SYMBOL(transport_handle_cdb_direct);
1329 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1330 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1332 if (!sgl || !sgl_count)
1336 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1337 * scatterlists already have been set to follow what the fabric
1338 * passes for the original expected data transfer length.
1340 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1341 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1342 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1343 return TCM_INVALID_CDB_FIELD;
1346 cmd->t_data_sg = sgl;
1347 cmd->t_data_nents = sgl_count;
1349 if (sgl_bidi && sgl_bidi_count) {
1350 cmd->t_bidi_data_sg = sgl_bidi;
1351 cmd->t_bidi_data_nents = sgl_bidi_count;
1353 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1358 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1359 * se_cmd + use pre-allocated SGL memory.
1361 * @se_cmd: command descriptor to submit
1362 * @se_sess: associated se_sess for endpoint
1363 * @cdb: pointer to SCSI CDB
1364 * @sense: pointer to SCSI sense buffer
1365 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1366 * @data_length: fabric expected data transfer length
1367 * @task_addr: SAM task attribute
1368 * @data_dir: DMA data direction
1369 * @flags: flags for command submission from target_sc_flags_tables
1370 * @sgl: struct scatterlist memory for unidirectional mapping
1371 * @sgl_count: scatterlist count for unidirectional mapping
1372 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1373 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1374 * @sgl_prot: struct scatterlist memory protection information
1375 * @sgl_prot_count: scatterlist count for protection information
1377 * Returns non zero to signal active I/O shutdown failure. All other
1378 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1379 * but still return zero here.
1381 * This may only be called from process context, and also currently
1382 * assumes internal allocation of fabric payload buffer by target-core.
1384 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1385 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1386 u32 data_length, int task_attr, int data_dir, int flags,
1387 struct scatterlist *sgl, u32 sgl_count,
1388 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1389 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1391 struct se_portal_group *se_tpg;
1395 se_tpg = se_sess->se_tpg;
1397 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1398 BUG_ON(in_interrupt());
1400 * Initialize se_cmd for target operation. From this point
1401 * exceptions are handled by sending exception status via
1402 * target_core_fabric_ops->queue_status() callback
1404 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1405 data_length, data_dir, task_attr, sense);
1406 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1407 se_cmd->unknown_data_length = 1;
1409 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1410 * se_sess->sess_cmd_list. A second kref_get here is necessary
1411 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1412 * kref_put() to happen during fabric packet acknowledgement.
1414 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1418 * Signal bidirectional data payloads to target-core
1420 if (flags & TARGET_SCF_BIDI_OP)
1421 se_cmd->se_cmd_flags |= SCF_BIDI;
1423 * Locate se_lun pointer and attach it to struct se_cmd
1425 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1427 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1428 target_put_sess_cmd(se_sess, se_cmd);
1432 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1434 transport_generic_request_failure(se_cmd, rc);
1439 * Save pointers for SGLs containing protection information,
1442 if (sgl_prot_count) {
1443 se_cmd->t_prot_sg = sgl_prot;
1444 se_cmd->t_prot_nents = sgl_prot_count;
1448 * When a non zero sgl_count has been passed perform SGL passthrough
1449 * mapping for pre-allocated fabric memory instead of having target
1450 * core perform an internal SGL allocation..
1452 if (sgl_count != 0) {
1456 * A work-around for tcm_loop as some userspace code via
1457 * scsi-generic do not memset their associated read buffers,
1458 * so go ahead and do that here for type non-data CDBs. Also
1459 * note that this is currently guaranteed to be a single SGL
1460 * for this case by target core in target_setup_cmd_from_cdb()
1461 * -> transport_generic_cmd_sequencer().
1463 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1464 se_cmd->data_direction == DMA_FROM_DEVICE) {
1465 unsigned char *buf = NULL;
1468 buf = kmap(sg_page(sgl)) + sgl->offset;
1471 memset(buf, 0, sgl->length);
1472 kunmap(sg_page(sgl));
1476 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1477 sgl_bidi, sgl_bidi_count);
1479 transport_generic_request_failure(se_cmd, rc);
1485 * Check if we need to delay processing because of ALUA
1486 * Active/NonOptimized primary access state..
1488 core_alua_check_nonop_delay(se_cmd);
1490 transport_handle_cdb_direct(se_cmd);
1493 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1496 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1498 * @se_cmd: command descriptor to submit
1499 * @se_sess: associated se_sess for endpoint
1500 * @cdb: pointer to SCSI CDB
1501 * @sense: pointer to SCSI sense buffer
1502 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1503 * @data_length: fabric expected data transfer length
1504 * @task_addr: SAM task attribute
1505 * @data_dir: DMA data direction
1506 * @flags: flags for command submission from target_sc_flags_tables
1508 * Returns non zero to signal active I/O shutdown failure. All other
1509 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1510 * but still return zero here.
1512 * This may only be called from process context, and also currently
1513 * assumes internal allocation of fabric payload buffer by target-core.
1515 * It also assumes interal target core SGL memory allocation.
1517 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1518 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1519 u32 data_length, int task_attr, int data_dir, int flags)
1521 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1522 unpacked_lun, data_length, task_attr, data_dir,
1523 flags, NULL, 0, NULL, 0, NULL, 0);
1525 EXPORT_SYMBOL(target_submit_cmd);
1527 static void target_complete_tmr_failure(struct work_struct *work)
1529 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1531 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1532 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1534 transport_cmd_check_stop_to_fabric(se_cmd);
1538 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1541 * @se_cmd: command descriptor to submit
1542 * @se_sess: associated se_sess for endpoint
1543 * @sense: pointer to SCSI sense buffer
1544 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1545 * @fabric_context: fabric context for TMR req
1546 * @tm_type: Type of TM request
1547 * @gfp: gfp type for caller
1548 * @tag: referenced task tag for TMR_ABORT_TASK
1549 * @flags: submit cmd flags
1551 * Callable from all contexts.
1554 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1555 unsigned char *sense, u32 unpacked_lun,
1556 void *fabric_tmr_ptr, unsigned char tm_type,
1557 gfp_t gfp, unsigned int tag, int flags)
1559 struct se_portal_group *se_tpg;
1562 se_tpg = se_sess->se_tpg;
1565 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1566 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
1568 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1569 * allocation failure.
1571 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1575 if (tm_type == TMR_ABORT_TASK)
1576 se_cmd->se_tmr_req->ref_task_tag = tag;
1578 /* See target_submit_cmd for commentary */
1579 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1581 core_tmr_release_req(se_cmd->se_tmr_req);
1585 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1588 * For callback during failure handling, push this work off
1589 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1591 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1592 schedule_work(&se_cmd->work);
1595 transport_generic_handle_tmr(se_cmd);
1598 EXPORT_SYMBOL(target_submit_tmr);
1601 * If the cmd is active, request it to be stopped and sleep until it
1604 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1606 bool was_active = false;
1608 if (cmd->transport_state & CMD_T_BUSY) {
1609 cmd->transport_state |= CMD_T_REQUEST_STOP;
1610 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1612 pr_debug("cmd %p waiting to complete\n", cmd);
1613 wait_for_completion(&cmd->task_stop_comp);
1614 pr_debug("cmd %p stopped successfully\n", cmd);
1616 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1617 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1618 cmd->transport_state &= ~CMD_T_BUSY;
1626 * Handle SAM-esque emulation for generic transport request failures.
1628 void transport_generic_request_failure(struct se_cmd *cmd,
1629 sense_reason_t sense_reason)
1633 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1634 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1635 cmd->t_task_cdb[0]);
1636 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1637 cmd->se_tfo->get_cmd_state(cmd),
1638 cmd->t_state, sense_reason);
1639 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1640 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1641 (cmd->transport_state & CMD_T_STOP) != 0,
1642 (cmd->transport_state & CMD_T_SENT) != 0);
1645 * For SAM Task Attribute emulation for failed struct se_cmd
1647 transport_complete_task_attr(cmd);
1649 * Handle special case for COMPARE_AND_WRITE failure, where the
1650 * callback is expected to drop the per device ->caw_mutex.
1652 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1653 cmd->transport_complete_callback)
1654 cmd->transport_complete_callback(cmd);
1656 switch (sense_reason) {
1657 case TCM_NON_EXISTENT_LUN:
1658 case TCM_UNSUPPORTED_SCSI_OPCODE:
1659 case TCM_INVALID_CDB_FIELD:
1660 case TCM_INVALID_PARAMETER_LIST:
1661 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1662 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1663 case TCM_UNKNOWN_MODE_PAGE:
1664 case TCM_WRITE_PROTECTED:
1665 case TCM_ADDRESS_OUT_OF_RANGE:
1666 case TCM_CHECK_CONDITION_ABORT_CMD:
1667 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1668 case TCM_CHECK_CONDITION_NOT_READY:
1669 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1670 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1671 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1673 case TCM_OUT_OF_RESOURCES:
1674 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1676 case TCM_RESERVATION_CONFLICT:
1678 * No SENSE Data payload for this case, set SCSI Status
1679 * and queue the response to $FABRIC_MOD.
1681 * Uses linux/include/scsi/scsi.h SAM status codes defs
1683 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1685 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1686 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1689 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1692 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1693 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1694 cmd->orig_fe_lun, 0x2C,
1695 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1697 trace_target_cmd_complete(cmd);
1698 ret = cmd->se_tfo-> queue_status(cmd);
1699 if (ret == -EAGAIN || ret == -ENOMEM)
1703 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1704 cmd->t_task_cdb[0], sense_reason);
1705 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1709 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1710 if (ret == -EAGAIN || ret == -ENOMEM)
1714 transport_lun_remove_cmd(cmd);
1715 if (!transport_cmd_check_stop_to_fabric(cmd))
1720 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1721 transport_handle_queue_full(cmd, cmd->se_dev);
1723 EXPORT_SYMBOL(transport_generic_request_failure);
1725 void __target_execute_cmd(struct se_cmd *cmd)
1729 if (cmd->execute_cmd) {
1730 ret = cmd->execute_cmd(cmd);
1732 spin_lock_irq(&cmd->t_state_lock);
1733 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1734 spin_unlock_irq(&cmd->t_state_lock);
1736 transport_generic_request_failure(cmd, ret);
1741 static int target_write_prot_action(struct se_cmd *cmd)
1745 * Perform WRITE_INSERT of PI using software emulation when backend
1746 * device has PI enabled, if the transport has not already generated
1747 * PI using hardware WRITE_INSERT offload.
1749 switch (cmd->prot_op) {
1750 case TARGET_PROT_DOUT_INSERT:
1751 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1752 sbc_dif_generate(cmd);
1754 case TARGET_PROT_DOUT_STRIP:
1755 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1758 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
1759 cmd->pi_err = sbc_dif_verify_write(cmd, cmd->t_task_lba,
1760 sectors, 0, NULL, 0);
1761 if (unlikely(cmd->pi_err)) {
1762 spin_lock_irq(&cmd->t_state_lock);
1763 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1764 spin_unlock_irq(&cmd->t_state_lock);
1765 transport_generic_request_failure(cmd, cmd->pi_err);
1776 static bool target_handle_task_attr(struct se_cmd *cmd)
1778 struct se_device *dev = cmd->se_dev;
1780 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1784 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1785 * to allow the passed struct se_cmd list of tasks to the front of the list.
1787 switch (cmd->sam_task_attr) {
1789 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1790 "se_ordered_id: %u\n",
1791 cmd->t_task_cdb[0], cmd->se_ordered_id);
1793 case TCM_ORDERED_TAG:
1794 atomic_inc_mb(&dev->dev_ordered_sync);
1796 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1797 " se_ordered_id: %u\n",
1798 cmd->t_task_cdb[0], cmd->se_ordered_id);
1801 * Execute an ORDERED command if no other older commands
1802 * exist that need to be completed first.
1804 if (!atomic_read(&dev->simple_cmds))
1809 * For SIMPLE and UNTAGGED Task Attribute commands
1811 atomic_inc_mb(&dev->simple_cmds);
1815 if (atomic_read(&dev->dev_ordered_sync) == 0)
1818 spin_lock(&dev->delayed_cmd_lock);
1819 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1820 spin_unlock(&dev->delayed_cmd_lock);
1822 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1823 " delayed CMD list, se_ordered_id: %u\n",
1824 cmd->t_task_cdb[0], cmd->sam_task_attr,
1825 cmd->se_ordered_id);
1829 void target_execute_cmd(struct se_cmd *cmd)
1832 * If the received CDB has aleady been aborted stop processing it here.
1834 if (transport_check_aborted_status(cmd, 1))
1838 * Determine if frontend context caller is requesting the stopping of
1839 * this command for frontend exceptions.
1841 spin_lock_irq(&cmd->t_state_lock);
1842 if (cmd->transport_state & CMD_T_STOP) {
1843 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1845 cmd->se_tfo->get_task_tag(cmd));
1847 spin_unlock_irq(&cmd->t_state_lock);
1848 complete_all(&cmd->t_transport_stop_comp);
1852 cmd->t_state = TRANSPORT_PROCESSING;
1853 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1854 spin_unlock_irq(&cmd->t_state_lock);
1856 if (target_write_prot_action(cmd))
1859 if (target_handle_task_attr(cmd)) {
1860 spin_lock_irq(&cmd->t_state_lock);
1861 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1862 spin_unlock_irq(&cmd->t_state_lock);
1866 __target_execute_cmd(cmd);
1868 EXPORT_SYMBOL(target_execute_cmd);
1871 * Process all commands up to the last received ORDERED task attribute which
1872 * requires another blocking boundary
1874 static void target_restart_delayed_cmds(struct se_device *dev)
1879 spin_lock(&dev->delayed_cmd_lock);
1880 if (list_empty(&dev->delayed_cmd_list)) {
1881 spin_unlock(&dev->delayed_cmd_lock);
1885 cmd = list_entry(dev->delayed_cmd_list.next,
1886 struct se_cmd, se_delayed_node);
1887 list_del(&cmd->se_delayed_node);
1888 spin_unlock(&dev->delayed_cmd_lock);
1890 __target_execute_cmd(cmd);
1892 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
1898 * Called from I/O completion to determine which dormant/delayed
1899 * and ordered cmds need to have their tasks added to the execution queue.
1901 static void transport_complete_task_attr(struct se_cmd *cmd)
1903 struct se_device *dev = cmd->se_dev;
1905 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1908 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
1909 atomic_dec_mb(&dev->simple_cmds);
1910 dev->dev_cur_ordered_id++;
1911 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1912 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1913 cmd->se_ordered_id);
1914 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
1915 dev->dev_cur_ordered_id++;
1916 pr_debug("Incremented dev_cur_ordered_id: %u for"
1917 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1918 cmd->se_ordered_id);
1919 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
1920 atomic_dec_mb(&dev->dev_ordered_sync);
1922 dev->dev_cur_ordered_id++;
1923 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1924 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1927 target_restart_delayed_cmds(dev);
1930 static void transport_complete_qf(struct se_cmd *cmd)
1934 transport_complete_task_attr(cmd);
1936 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1937 trace_target_cmd_complete(cmd);
1938 ret = cmd->se_tfo->queue_status(cmd);
1942 switch (cmd->data_direction) {
1943 case DMA_FROM_DEVICE:
1944 trace_target_cmd_complete(cmd);
1945 ret = cmd->se_tfo->queue_data_in(cmd);
1948 if (cmd->se_cmd_flags & SCF_BIDI) {
1949 ret = cmd->se_tfo->queue_data_in(cmd);
1953 /* Fall through for DMA_TO_DEVICE */
1955 trace_target_cmd_complete(cmd);
1956 ret = cmd->se_tfo->queue_status(cmd);
1964 transport_handle_queue_full(cmd, cmd->se_dev);
1967 transport_lun_remove_cmd(cmd);
1968 transport_cmd_check_stop_to_fabric(cmd);
1971 static void transport_handle_queue_full(
1973 struct se_device *dev)
1975 spin_lock_irq(&dev->qf_cmd_lock);
1976 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1977 atomic_inc_mb(&dev->dev_qf_count);
1978 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1980 schedule_work(&cmd->se_dev->qf_work_queue);
1983 static bool target_read_prot_action(struct se_cmd *cmd)
1987 switch (cmd->prot_op) {
1988 case TARGET_PROT_DIN_STRIP:
1989 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
1990 rc = sbc_dif_read_strip(cmd);
2004 static void target_complete_ok_work(struct work_struct *work)
2006 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2010 * Check if we need to move delayed/dormant tasks from cmds on the
2011 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2014 transport_complete_task_attr(cmd);
2017 * Check to schedule QUEUE_FULL work, or execute an existing
2018 * cmd->transport_qf_callback()
2020 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2021 schedule_work(&cmd->se_dev->qf_work_queue);
2024 * Check if we need to send a sense buffer from
2025 * the struct se_cmd in question.
2027 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2028 WARN_ON(!cmd->scsi_status);
2029 ret = transport_send_check_condition_and_sense(
2031 if (ret == -EAGAIN || ret == -ENOMEM)
2034 transport_lun_remove_cmd(cmd);
2035 transport_cmd_check_stop_to_fabric(cmd);
2039 * Check for a callback, used by amongst other things
2040 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
2042 if (cmd->transport_complete_callback) {
2045 rc = cmd->transport_complete_callback(cmd);
2046 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
2049 ret = transport_send_check_condition_and_sense(cmd,
2051 if (ret == -EAGAIN || ret == -ENOMEM)
2054 transport_lun_remove_cmd(cmd);
2055 transport_cmd_check_stop_to_fabric(cmd);
2060 switch (cmd->data_direction) {
2061 case DMA_FROM_DEVICE:
2062 spin_lock(&cmd->se_lun->lun_sep_lock);
2063 if (cmd->se_lun->lun_sep) {
2064 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2067 spin_unlock(&cmd->se_lun->lun_sep_lock);
2069 * Perform READ_STRIP of PI using software emulation when
2070 * backend had PI enabled, if the transport will not be
2071 * performing hardware READ_STRIP offload.
2073 if (target_read_prot_action(cmd)) {
2074 ret = transport_send_check_condition_and_sense(cmd,
2076 if (ret == -EAGAIN || ret == -ENOMEM)
2079 transport_lun_remove_cmd(cmd);
2080 transport_cmd_check_stop_to_fabric(cmd);
2084 trace_target_cmd_complete(cmd);
2085 ret = cmd->se_tfo->queue_data_in(cmd);
2086 if (ret == -EAGAIN || ret == -ENOMEM)
2090 spin_lock(&cmd->se_lun->lun_sep_lock);
2091 if (cmd->se_lun->lun_sep) {
2092 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2095 spin_unlock(&cmd->se_lun->lun_sep_lock);
2097 * Check if we need to send READ payload for BIDI-COMMAND
2099 if (cmd->se_cmd_flags & SCF_BIDI) {
2100 spin_lock(&cmd->se_lun->lun_sep_lock);
2101 if (cmd->se_lun->lun_sep) {
2102 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2105 spin_unlock(&cmd->se_lun->lun_sep_lock);
2106 ret = cmd->se_tfo->queue_data_in(cmd);
2107 if (ret == -EAGAIN || ret == -ENOMEM)
2111 /* Fall through for DMA_TO_DEVICE */
2113 trace_target_cmd_complete(cmd);
2114 ret = cmd->se_tfo->queue_status(cmd);
2115 if (ret == -EAGAIN || ret == -ENOMEM)
2122 transport_lun_remove_cmd(cmd);
2123 transport_cmd_check_stop_to_fabric(cmd);
2127 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2128 " data_direction: %d\n", cmd, cmd->data_direction);
2129 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2130 transport_handle_queue_full(cmd, cmd->se_dev);
2133 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2135 struct scatterlist *sg;
2138 for_each_sg(sgl, sg, nents, count)
2139 __free_page(sg_page(sg));
2144 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2147 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2148 * emulation, and free + reset pointers if necessary..
2150 if (!cmd->t_data_sg_orig)
2153 kfree(cmd->t_data_sg);
2154 cmd->t_data_sg = cmd->t_data_sg_orig;
2155 cmd->t_data_sg_orig = NULL;
2156 cmd->t_data_nents = cmd->t_data_nents_orig;
2157 cmd->t_data_nents_orig = 0;
2160 static inline void transport_free_pages(struct se_cmd *cmd)
2162 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2163 transport_reset_sgl_orig(cmd);
2166 transport_reset_sgl_orig(cmd);
2168 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2169 cmd->t_data_sg = NULL;
2170 cmd->t_data_nents = 0;
2172 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2173 cmd->t_bidi_data_sg = NULL;
2174 cmd->t_bidi_data_nents = 0;
2176 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2177 cmd->t_prot_sg = NULL;
2178 cmd->t_prot_nents = 0;
2182 * transport_release_cmd - free a command
2183 * @cmd: command to free
2185 * This routine unconditionally frees a command, and reference counting
2186 * or list removal must be done in the caller.
2188 static int transport_release_cmd(struct se_cmd *cmd)
2190 BUG_ON(!cmd->se_tfo);
2192 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2193 core_tmr_release_req(cmd->se_tmr_req);
2194 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2195 kfree(cmd->t_task_cdb);
2197 * If this cmd has been setup with target_get_sess_cmd(), drop
2198 * the kref and call ->release_cmd() in kref callback.
2200 return target_put_sess_cmd(cmd->se_sess, cmd);
2204 * transport_put_cmd - release a reference to a command
2205 * @cmd: command to release
2207 * This routine releases our reference to the command and frees it if possible.
2209 static int transport_put_cmd(struct se_cmd *cmd)
2211 transport_free_pages(cmd);
2212 return transport_release_cmd(cmd);
2215 void *transport_kmap_data_sg(struct se_cmd *cmd)
2217 struct scatterlist *sg = cmd->t_data_sg;
2218 struct page **pages;
2222 * We need to take into account a possible offset here for fabrics like
2223 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2224 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2226 if (!cmd->t_data_nents)
2230 if (cmd->t_data_nents == 1)
2231 return kmap(sg_page(sg)) + sg->offset;
2233 /* >1 page. use vmap */
2234 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2238 /* convert sg[] to pages[] */
2239 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2240 pages[i] = sg_page(sg);
2243 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2245 if (!cmd->t_data_vmap)
2248 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2250 EXPORT_SYMBOL(transport_kmap_data_sg);
2252 void transport_kunmap_data_sg(struct se_cmd *cmd)
2254 if (!cmd->t_data_nents) {
2256 } else if (cmd->t_data_nents == 1) {
2257 kunmap(sg_page(cmd->t_data_sg));
2261 vunmap(cmd->t_data_vmap);
2262 cmd->t_data_vmap = NULL;
2264 EXPORT_SYMBOL(transport_kunmap_data_sg);
2267 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2270 struct scatterlist *sg;
2272 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2276 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2277 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2281 sg_init_table(sg, nent);
2284 u32 page_len = min_t(u32, length, PAGE_SIZE);
2285 page = alloc_page(GFP_KERNEL | zero_flag);
2289 sg_set_page(&sg[i], page, page_len, 0);
2300 __free_page(sg_page(&sg[i]));
2307 * Allocate any required resources to execute the command. For writes we
2308 * might not have the payload yet, so notify the fabric via a call to
2309 * ->write_pending instead. Otherwise place it on the execution queue.
2312 transport_generic_new_cmd(struct se_cmd *cmd)
2317 * Determine is the TCM fabric module has already allocated physical
2318 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2321 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2323 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2325 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2326 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2329 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2330 bidi_length = cmd->t_task_nolb *
2331 cmd->se_dev->dev_attrib.block_size;
2333 bidi_length = cmd->data_length;
2335 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2336 &cmd->t_bidi_data_nents,
2337 bidi_length, zero_flag);
2339 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2342 if (cmd->prot_op != TARGET_PROT_NORMAL) {
2343 ret = target_alloc_sgl(&cmd->t_prot_sg,
2345 cmd->prot_length, true);
2347 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2350 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2351 cmd->data_length, zero_flag);
2353 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2356 * If this command is not a write we can execute it right here,
2357 * for write buffers we need to notify the fabric driver first
2358 * and let it call back once the write buffers are ready.
2360 target_add_to_state_list(cmd);
2361 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
2362 target_execute_cmd(cmd);
2365 transport_cmd_check_stop(cmd, false, true);
2367 ret = cmd->se_tfo->write_pending(cmd);
2368 if (ret == -EAGAIN || ret == -ENOMEM)
2371 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2374 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2377 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2378 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2379 transport_handle_queue_full(cmd, cmd->se_dev);
2382 EXPORT_SYMBOL(transport_generic_new_cmd);
2384 static void transport_write_pending_qf(struct se_cmd *cmd)
2388 ret = cmd->se_tfo->write_pending(cmd);
2389 if (ret == -EAGAIN || ret == -ENOMEM) {
2390 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2392 transport_handle_queue_full(cmd, cmd->se_dev);
2396 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2398 unsigned long flags;
2401 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2402 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2403 transport_wait_for_tasks(cmd);
2405 ret = transport_release_cmd(cmd);
2408 transport_wait_for_tasks(cmd);
2410 * Handle WRITE failure case where transport_generic_new_cmd()
2411 * has already added se_cmd to state_list, but fabric has
2412 * failed command before I/O submission.
2414 if (cmd->state_active) {
2415 spin_lock_irqsave(&cmd->t_state_lock, flags);
2416 target_remove_from_state_list(cmd);
2417 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2421 transport_lun_remove_cmd(cmd);
2423 ret = transport_put_cmd(cmd);
2427 EXPORT_SYMBOL(transport_generic_free_cmd);
2429 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2430 * @se_sess: session to reference
2431 * @se_cmd: command descriptor to add
2432 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2434 int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2437 unsigned long flags;
2441 * Add a second kref if the fabric caller is expecting to handle
2442 * fabric acknowledgement that requires two target_put_sess_cmd()
2443 * invocations before se_cmd descriptor release.
2446 kref_get(&se_cmd->cmd_kref);
2447 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2450 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2451 if (se_sess->sess_tearing_down) {
2455 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2457 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2460 EXPORT_SYMBOL(target_get_sess_cmd);
2462 static void target_release_cmd_kref(struct kref *kref)
2463 __releases(&se_cmd->se_sess->sess_cmd_lock)
2465 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2466 struct se_session *se_sess = se_cmd->se_sess;
2468 if (list_empty(&se_cmd->se_cmd_list)) {
2469 spin_unlock(&se_sess->sess_cmd_lock);
2470 se_cmd->se_tfo->release_cmd(se_cmd);
2473 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2474 spin_unlock(&se_sess->sess_cmd_lock);
2475 complete(&se_cmd->cmd_wait_comp);
2478 list_del(&se_cmd->se_cmd_list);
2479 spin_unlock(&se_sess->sess_cmd_lock);
2481 se_cmd->se_tfo->release_cmd(se_cmd);
2484 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2485 * @se_sess: session to reference
2486 * @se_cmd: command descriptor to drop
2488 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2491 se_cmd->se_tfo->release_cmd(se_cmd);
2494 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2495 &se_sess->sess_cmd_lock);
2497 EXPORT_SYMBOL(target_put_sess_cmd);
2499 /* target_sess_cmd_list_set_waiting - Flag all commands in
2500 * sess_cmd_list to complete cmd_wait_comp. Set
2501 * sess_tearing_down so no more commands are queued.
2502 * @se_sess: session to flag
2504 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2506 struct se_cmd *se_cmd;
2507 unsigned long flags;
2509 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2510 if (se_sess->sess_tearing_down) {
2511 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2514 se_sess->sess_tearing_down = 1;
2515 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2517 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2518 se_cmd->cmd_wait_set = 1;
2520 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2522 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2524 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2525 * @se_sess: session to wait for active I/O
2527 void target_wait_for_sess_cmds(struct se_session *se_sess)
2529 struct se_cmd *se_cmd, *tmp_cmd;
2530 unsigned long flags;
2532 list_for_each_entry_safe(se_cmd, tmp_cmd,
2533 &se_sess->sess_wait_list, se_cmd_list) {
2534 list_del(&se_cmd->se_cmd_list);
2536 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2537 " %d\n", se_cmd, se_cmd->t_state,
2538 se_cmd->se_tfo->get_cmd_state(se_cmd));
2540 wait_for_completion(&se_cmd->cmd_wait_comp);
2541 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2542 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2543 se_cmd->se_tfo->get_cmd_state(se_cmd));
2545 se_cmd->se_tfo->release_cmd(se_cmd);
2548 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2549 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2550 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2553 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2555 static int transport_clear_lun_ref_thread(void *p)
2557 struct se_lun *lun = p;
2559 percpu_ref_kill(&lun->lun_ref);
2561 wait_for_completion(&lun->lun_ref_comp);
2562 complete(&lun->lun_shutdown_comp);
2567 int transport_clear_lun_ref(struct se_lun *lun)
2569 struct task_struct *kt;
2571 kt = kthread_run(transport_clear_lun_ref_thread, lun,
2572 "tcm_cl_%u", lun->unpacked_lun);
2574 pr_err("Unable to start clear_lun thread\n");
2577 wait_for_completion(&lun->lun_shutdown_comp);
2583 * transport_wait_for_tasks - wait for completion to occur
2584 * @cmd: command to wait
2586 * Called from frontend fabric context to wait for storage engine
2587 * to pause and/or release frontend generated struct se_cmd.
2589 bool transport_wait_for_tasks(struct se_cmd *cmd)
2591 unsigned long flags;
2593 spin_lock_irqsave(&cmd->t_state_lock, flags);
2594 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2595 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2596 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2600 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2601 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2602 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2606 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2607 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2611 cmd->transport_state |= CMD_T_STOP;
2613 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2614 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2615 cmd, cmd->se_tfo->get_task_tag(cmd),
2616 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2618 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2620 wait_for_completion(&cmd->t_transport_stop_comp);
2622 spin_lock_irqsave(&cmd->t_state_lock, flags);
2623 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2625 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2626 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2627 cmd->se_tfo->get_task_tag(cmd));
2629 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2633 EXPORT_SYMBOL(transport_wait_for_tasks);
2635 static int transport_get_sense_codes(
2640 *asc = cmd->scsi_asc;
2641 *ascq = cmd->scsi_ascq;
2647 void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2649 /* Place failed LBA in sense data information descriptor 0. */
2650 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2651 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2652 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2653 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2655 /* Descriptor Information: failing sector */
2656 put_unaligned_be64(bad_sector, &buffer[12]);
2660 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2661 sense_reason_t reason, int from_transport)
2663 unsigned char *buffer = cmd->sense_buffer;
2664 unsigned long flags;
2665 u8 asc = 0, ascq = 0;
2667 spin_lock_irqsave(&cmd->t_state_lock, flags);
2668 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2669 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2672 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2673 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2675 if (!reason && from_transport)
2678 if (!from_transport)
2679 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2682 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2683 * SENSE KEY values from include/scsi/scsi.h
2689 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2691 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2692 /* NO ADDITIONAL SENSE INFORMATION */
2693 buffer[SPC_ASC_KEY_OFFSET] = 0;
2694 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2696 case TCM_NON_EXISTENT_LUN:
2699 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2700 /* ILLEGAL REQUEST */
2701 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2702 /* LOGICAL UNIT NOT SUPPORTED */
2703 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2705 case TCM_UNSUPPORTED_SCSI_OPCODE:
2706 case TCM_SECTOR_COUNT_TOO_MANY:
2709 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2710 /* ILLEGAL REQUEST */
2711 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2712 /* INVALID COMMAND OPERATION CODE */
2713 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2715 case TCM_UNKNOWN_MODE_PAGE:
2718 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2719 /* ILLEGAL REQUEST */
2720 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2721 /* INVALID FIELD IN CDB */
2722 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2724 case TCM_CHECK_CONDITION_ABORT_CMD:
2727 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2728 /* ABORTED COMMAND */
2729 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2730 /* BUS DEVICE RESET FUNCTION OCCURRED */
2731 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2732 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2734 case TCM_INCORRECT_AMOUNT_OF_DATA:
2737 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2738 /* ABORTED COMMAND */
2739 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2741 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2742 /* NOT ENOUGH UNSOLICITED DATA */
2743 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2745 case TCM_INVALID_CDB_FIELD:
2748 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2749 /* ILLEGAL REQUEST */
2750 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2751 /* INVALID FIELD IN CDB */
2752 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2754 case TCM_INVALID_PARAMETER_LIST:
2757 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2758 /* ILLEGAL REQUEST */
2759 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2760 /* INVALID FIELD IN PARAMETER LIST */
2761 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2763 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2766 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2767 /* ILLEGAL REQUEST */
2768 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2769 /* PARAMETER LIST LENGTH ERROR */
2770 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2772 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2775 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2776 /* ABORTED COMMAND */
2777 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2779 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2780 /* UNEXPECTED_UNSOLICITED_DATA */
2781 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2783 case TCM_SERVICE_CRC_ERROR:
2786 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2787 /* ABORTED COMMAND */
2788 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2789 /* PROTOCOL SERVICE CRC ERROR */
2790 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2792 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2794 case TCM_SNACK_REJECTED:
2797 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2798 /* ABORTED COMMAND */
2799 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2801 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2802 /* FAILED RETRANSMISSION REQUEST */
2803 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2805 case TCM_WRITE_PROTECTED:
2808 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2810 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2811 /* WRITE PROTECTED */
2812 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2814 case TCM_ADDRESS_OUT_OF_RANGE:
2817 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2818 /* ILLEGAL REQUEST */
2819 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2820 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2821 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2823 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2826 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2827 /* UNIT ATTENTION */
2828 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2829 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2830 buffer[SPC_ASC_KEY_OFFSET] = asc;
2831 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2833 case TCM_CHECK_CONDITION_NOT_READY:
2836 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2838 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2839 transport_get_sense_codes(cmd, &asc, &ascq);
2840 buffer[SPC_ASC_KEY_OFFSET] = asc;
2841 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2843 case TCM_MISCOMPARE_VERIFY:
2846 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2847 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2848 /* MISCOMPARE DURING VERIFY OPERATION */
2849 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2850 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2852 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2855 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2856 /* ILLEGAL REQUEST */
2857 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2858 /* LOGICAL BLOCK GUARD CHECK FAILED */
2859 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2860 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
2861 transport_err_sector_info(buffer, cmd->bad_sector);
2863 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2866 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2867 /* ILLEGAL REQUEST */
2868 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2869 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2870 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2871 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
2872 transport_err_sector_info(buffer, cmd->bad_sector);
2874 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2877 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2878 /* ILLEGAL REQUEST */
2879 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2880 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2881 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2882 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2883 transport_err_sector_info(buffer, cmd->bad_sector);
2885 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2889 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2891 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2892 * Solaris initiators. Returning NOT READY instead means the
2893 * operations will be retried a finite number of times and we
2894 * can survive intermittent errors.
2896 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2897 /* LOGICAL UNIT COMMUNICATION FAILURE */
2898 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2902 * This code uses linux/include/scsi/scsi.h SAM status codes!
2904 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2906 * Automatically padded, this value is encoded in the fabric's
2907 * data_length response PDU containing the SCSI defined sense data.
2909 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2912 trace_target_cmd_complete(cmd);
2913 return cmd->se_tfo->queue_status(cmd);
2915 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2917 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2919 if (!(cmd->transport_state & CMD_T_ABORTED))
2923 * If cmd has been aborted but either no status is to be sent or it has
2924 * already been sent, just return
2926 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
2929 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2930 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
2932 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
2933 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2934 trace_target_cmd_complete(cmd);
2935 cmd->se_tfo->queue_status(cmd);
2939 EXPORT_SYMBOL(transport_check_aborted_status);
2941 void transport_send_task_abort(struct se_cmd *cmd)
2943 unsigned long flags;
2945 spin_lock_irqsave(&cmd->t_state_lock, flags);
2946 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
2947 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2950 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2953 * If there are still expected incoming fabric WRITEs, we wait
2954 * until until they have completed before sending a TASK_ABORTED
2955 * response. This response with TASK_ABORTED status will be
2956 * queued back to fabric module by transport_check_aborted_status().
2958 if (cmd->data_direction == DMA_TO_DEVICE) {
2959 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2960 cmd->transport_state |= CMD_T_ABORTED;
2961 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
2965 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2967 transport_lun_remove_cmd(cmd);
2969 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2970 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
2971 cmd->se_tfo->get_task_tag(cmd));
2973 trace_target_cmd_complete(cmd);
2974 cmd->se_tfo->queue_status(cmd);
2977 static void target_tmr_work(struct work_struct *work)
2979 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2980 struct se_device *dev = cmd->se_dev;
2981 struct se_tmr_req *tmr = cmd->se_tmr_req;
2984 switch (tmr->function) {
2985 case TMR_ABORT_TASK:
2986 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2988 case TMR_ABORT_TASK_SET:
2990 case TMR_CLEAR_TASK_SET:
2991 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2994 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2995 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2996 TMR_FUNCTION_REJECTED;
2998 case TMR_TARGET_WARM_RESET:
2999 tmr->response = TMR_FUNCTION_REJECTED;
3001 case TMR_TARGET_COLD_RESET:
3002 tmr->response = TMR_FUNCTION_REJECTED;
3005 pr_err("Uknown TMR function: 0x%02x.\n",
3007 tmr->response = TMR_FUNCTION_REJECTED;
3011 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3012 cmd->se_tfo->queue_tm_rsp(cmd);
3014 transport_cmd_check_stop_to_fabric(cmd);
3017 int transport_generic_handle_tmr(
3020 unsigned long flags;
3022 spin_lock_irqsave(&cmd->t_state_lock, flags);
3023 cmd->transport_state |= CMD_T_ACTIVE;
3024 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3026 INIT_WORK(&cmd->work, target_tmr_work);
3027 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3030 EXPORT_SYMBOL(transport_generic_handle_tmr);