1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * (c) Copyright 2002-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/net.h>
27 #include <linux/delay.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/slab.h>
31 #include <linux/spinlock.h>
32 #include <linux/kthread.h>
34 #include <linux/cdrom.h>
35 #include <linux/module.h>
36 #include <linux/ratelimit.h>
37 #include <linux/vmalloc.h>
38 #include <asm/unaligned.h>
41 #include <scsi/scsi_proto.h>
42 #include <scsi/scsi_common.h>
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
48 #include "target_core_internal.h"
49 #include "target_core_alua.h"
50 #include "target_core_pr.h"
51 #include "target_core_ua.h"
53 #define CREATE_TRACE_POINTS
54 #include <trace/events/target.h>
56 static struct workqueue_struct *target_completion_wq;
57 static struct kmem_cache *se_sess_cache;
58 struct kmem_cache *se_ua_cache;
59 struct kmem_cache *t10_pr_reg_cache;
60 struct kmem_cache *t10_alua_lu_gp_cache;
61 struct kmem_cache *t10_alua_lu_gp_mem_cache;
62 struct kmem_cache *t10_alua_tg_pt_gp_cache;
63 struct kmem_cache *t10_alua_lba_map_cache;
64 struct kmem_cache *t10_alua_lba_map_mem_cache;
66 static void transport_complete_task_attr(struct se_cmd *cmd);
67 static void transport_handle_queue_full(struct se_cmd *cmd,
68 struct se_device *dev);
69 static int transport_put_cmd(struct se_cmd *cmd);
70 static void target_complete_ok_work(struct work_struct *work);
72 int init_se_kmem_caches(void)
74 se_sess_cache = kmem_cache_create("se_sess_cache",
75 sizeof(struct se_session), __alignof__(struct se_session),
78 pr_err("kmem_cache_create() for struct se_session"
82 se_ua_cache = kmem_cache_create("se_ua_cache",
83 sizeof(struct se_ua), __alignof__(struct se_ua),
86 pr_err("kmem_cache_create() for struct se_ua failed\n");
87 goto out_free_sess_cache;
89 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
90 sizeof(struct t10_pr_registration),
91 __alignof__(struct t10_pr_registration), 0, NULL);
92 if (!t10_pr_reg_cache) {
93 pr_err("kmem_cache_create() for struct t10_pr_registration"
95 goto out_free_ua_cache;
97 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
98 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
100 if (!t10_alua_lu_gp_cache) {
101 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
103 goto out_free_pr_reg_cache;
105 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
106 sizeof(struct t10_alua_lu_gp_member),
107 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
108 if (!t10_alua_lu_gp_mem_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
111 goto out_free_lu_gp_cache;
113 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
114 sizeof(struct t10_alua_tg_pt_gp),
115 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
116 if (!t10_alua_tg_pt_gp_cache) {
117 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
119 goto out_free_lu_gp_mem_cache;
121 t10_alua_lba_map_cache = kmem_cache_create(
122 "t10_alua_lba_map_cache",
123 sizeof(struct t10_alua_lba_map),
124 __alignof__(struct t10_alua_lba_map), 0, NULL);
125 if (!t10_alua_lba_map_cache) {
126 pr_err("kmem_cache_create() for t10_alua_lba_map_"
128 goto out_free_tg_pt_gp_cache;
130 t10_alua_lba_map_mem_cache = kmem_cache_create(
131 "t10_alua_lba_map_mem_cache",
132 sizeof(struct t10_alua_lba_map_member),
133 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
134 if (!t10_alua_lba_map_mem_cache) {
135 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
137 goto out_free_lba_map_cache;
140 target_completion_wq = alloc_workqueue("target_completion",
142 if (!target_completion_wq)
143 goto out_free_lba_map_mem_cache;
147 out_free_lba_map_mem_cache:
148 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
149 out_free_lba_map_cache:
150 kmem_cache_destroy(t10_alua_lba_map_cache);
151 out_free_tg_pt_gp_cache:
152 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
153 out_free_lu_gp_mem_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
155 out_free_lu_gp_cache:
156 kmem_cache_destroy(t10_alua_lu_gp_cache);
157 out_free_pr_reg_cache:
158 kmem_cache_destroy(t10_pr_reg_cache);
160 kmem_cache_destroy(se_ua_cache);
162 kmem_cache_destroy(se_sess_cache);
167 void release_se_kmem_caches(void)
169 destroy_workqueue(target_completion_wq);
170 kmem_cache_destroy(se_sess_cache);
171 kmem_cache_destroy(se_ua_cache);
172 kmem_cache_destroy(t10_pr_reg_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
176 kmem_cache_destroy(t10_alua_lba_map_cache);
177 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
180 /* This code ensures unique mib indexes are handed out. */
181 static DEFINE_SPINLOCK(scsi_mib_index_lock);
182 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
185 * Allocate a new row index for the entry type specified
187 u32 scsi_get_new_index(scsi_index_t type)
191 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
193 spin_lock(&scsi_mib_index_lock);
194 new_index = ++scsi_mib_index[type];
195 spin_unlock(&scsi_mib_index_lock);
200 void transport_subsystem_check_init(void)
203 static int sub_api_initialized;
205 if (sub_api_initialized)
208 ret = request_module("target_core_iblock");
210 pr_err("Unable to load target_core_iblock\n");
212 ret = request_module("target_core_file");
214 pr_err("Unable to load target_core_file\n");
216 ret = request_module("target_core_pscsi");
218 pr_err("Unable to load target_core_pscsi\n");
220 ret = request_module("target_core_user");
222 pr_err("Unable to load target_core_user\n");
224 sub_api_initialized = 1;
227 struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
229 struct se_session *se_sess;
231 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
233 pr_err("Unable to allocate struct se_session from"
235 return ERR_PTR(-ENOMEM);
237 INIT_LIST_HEAD(&se_sess->sess_list);
238 INIT_LIST_HEAD(&se_sess->sess_acl_list);
239 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
240 INIT_LIST_HEAD(&se_sess->sess_wait_list);
241 spin_lock_init(&se_sess->sess_cmd_lock);
242 kref_init(&se_sess->sess_kref);
243 se_sess->sup_prot_ops = sup_prot_ops;
247 EXPORT_SYMBOL(transport_init_session);
249 int transport_alloc_session_tags(struct se_session *se_sess,
250 unsigned int tag_num, unsigned int tag_size)
254 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
255 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
256 if (!se_sess->sess_cmd_map) {
257 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
258 if (!se_sess->sess_cmd_map) {
259 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
264 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
266 pr_err("Unable to init se_sess->sess_tag_pool,"
267 " tag_num: %u\n", tag_num);
268 kvfree(se_sess->sess_cmd_map);
269 se_sess->sess_cmd_map = NULL;
275 EXPORT_SYMBOL(transport_alloc_session_tags);
277 struct se_session *transport_init_session_tags(unsigned int tag_num,
278 unsigned int tag_size,
279 enum target_prot_op sup_prot_ops)
281 struct se_session *se_sess;
284 se_sess = transport_init_session(sup_prot_ops);
288 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
290 transport_free_session(se_sess);
291 return ERR_PTR(-ENOMEM);
296 EXPORT_SYMBOL(transport_init_session_tags);
299 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
301 void __transport_register_session(
302 struct se_portal_group *se_tpg,
303 struct se_node_acl *se_nacl,
304 struct se_session *se_sess,
305 void *fabric_sess_ptr)
307 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
308 unsigned char buf[PR_REG_ISID_LEN];
310 se_sess->se_tpg = se_tpg;
311 se_sess->fabric_sess_ptr = fabric_sess_ptr;
313 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
315 * Only set for struct se_session's that will actually be moving I/O.
316 * eg: *NOT* discovery sessions.
321 * Determine if fabric allows for T10-PI feature bits exposed to
322 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
324 * If so, then always save prot_type on a per se_node_acl node
325 * basis and re-instate the previous sess_prot_type to avoid
326 * disabling PI from below any previously initiator side
329 if (se_nacl->saved_prot_type)
330 se_sess->sess_prot_type = se_nacl->saved_prot_type;
331 else if (tfo->tpg_check_prot_fabric_only)
332 se_sess->sess_prot_type = se_nacl->saved_prot_type =
333 tfo->tpg_check_prot_fabric_only(se_tpg);
335 * If the fabric module supports an ISID based TransportID,
336 * save this value in binary from the fabric I_T Nexus now.
338 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
339 memset(&buf[0], 0, PR_REG_ISID_LEN);
340 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
341 &buf[0], PR_REG_ISID_LEN);
342 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
344 kref_get(&se_nacl->acl_kref);
346 spin_lock_irq(&se_nacl->nacl_sess_lock);
348 * The se_nacl->nacl_sess pointer will be set to the
349 * last active I_T Nexus for each struct se_node_acl.
351 se_nacl->nacl_sess = se_sess;
353 list_add_tail(&se_sess->sess_acl_list,
354 &se_nacl->acl_sess_list);
355 spin_unlock_irq(&se_nacl->nacl_sess_lock);
357 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
359 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
360 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
362 EXPORT_SYMBOL(__transport_register_session);
364 void transport_register_session(
365 struct se_portal_group *se_tpg,
366 struct se_node_acl *se_nacl,
367 struct se_session *se_sess,
368 void *fabric_sess_ptr)
372 spin_lock_irqsave(&se_tpg->session_lock, flags);
373 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
374 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
376 EXPORT_SYMBOL(transport_register_session);
378 static void target_release_session(struct kref *kref)
380 struct se_session *se_sess = container_of(kref,
381 struct se_session, sess_kref);
382 struct se_portal_group *se_tpg = se_sess->se_tpg;
384 se_tpg->se_tpg_tfo->close_session(se_sess);
387 void target_get_session(struct se_session *se_sess)
389 kref_get(&se_sess->sess_kref);
391 EXPORT_SYMBOL(target_get_session);
393 void target_put_session(struct se_session *se_sess)
395 kref_put(&se_sess->sess_kref, target_release_session);
397 EXPORT_SYMBOL(target_put_session);
399 ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
401 struct se_session *se_sess;
404 spin_lock_bh(&se_tpg->session_lock);
405 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
406 if (!se_sess->se_node_acl)
408 if (!se_sess->se_node_acl->dynamic_node_acl)
410 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
413 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
414 se_sess->se_node_acl->initiatorname);
415 len += 1; /* Include NULL terminator */
417 spin_unlock_bh(&se_tpg->session_lock);
421 EXPORT_SYMBOL(target_show_dynamic_sessions);
423 static void target_complete_nacl(struct kref *kref)
425 struct se_node_acl *nacl = container_of(kref,
426 struct se_node_acl, acl_kref);
428 complete(&nacl->acl_free_comp);
431 void target_put_nacl(struct se_node_acl *nacl)
433 kref_put(&nacl->acl_kref, target_complete_nacl);
436 void transport_deregister_session_configfs(struct se_session *se_sess)
438 struct se_node_acl *se_nacl;
441 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
443 se_nacl = se_sess->se_node_acl;
445 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
446 if (se_nacl->acl_stop == 0)
447 list_del(&se_sess->sess_acl_list);
449 * If the session list is empty, then clear the pointer.
450 * Otherwise, set the struct se_session pointer from the tail
451 * element of the per struct se_node_acl active session list.
453 if (list_empty(&se_nacl->acl_sess_list))
454 se_nacl->nacl_sess = NULL;
456 se_nacl->nacl_sess = container_of(
457 se_nacl->acl_sess_list.prev,
458 struct se_session, sess_acl_list);
460 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
463 EXPORT_SYMBOL(transport_deregister_session_configfs);
465 void transport_free_session(struct se_session *se_sess)
467 if (se_sess->sess_cmd_map) {
468 percpu_ida_destroy(&se_sess->sess_tag_pool);
469 kvfree(se_sess->sess_cmd_map);
471 kmem_cache_free(se_sess_cache, se_sess);
473 EXPORT_SYMBOL(transport_free_session);
475 void transport_deregister_session(struct se_session *se_sess)
477 struct se_portal_group *se_tpg = se_sess->se_tpg;
478 const struct target_core_fabric_ops *se_tfo;
479 struct se_node_acl *se_nacl;
481 bool comp_nacl = true, drop_nacl = false;
484 transport_free_session(se_sess);
487 se_tfo = se_tpg->se_tpg_tfo;
489 spin_lock_irqsave(&se_tpg->session_lock, flags);
490 list_del(&se_sess->sess_list);
491 se_sess->se_tpg = NULL;
492 se_sess->fabric_sess_ptr = NULL;
493 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
496 * Determine if we need to do extra work for this initiator node's
497 * struct se_node_acl if it had been previously dynamically generated.
499 se_nacl = se_sess->se_node_acl;
501 mutex_lock(&se_tpg->acl_node_mutex);
502 if (se_nacl && se_nacl->dynamic_node_acl) {
503 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
504 list_del(&se_nacl->acl_list);
505 se_tpg->num_node_acls--;
509 mutex_unlock(&se_tpg->acl_node_mutex);
512 core_tpg_wait_for_nacl_pr_ref(se_nacl);
513 core_free_device_list_for_node(se_nacl, se_tpg);
517 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
518 se_tpg->se_tpg_tfo->get_fabric_name());
520 * If last kref is dropping now for an explicit NodeACL, awake sleeping
521 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
524 if (se_nacl && comp_nacl)
525 target_put_nacl(se_nacl);
527 transport_free_session(se_sess);
529 EXPORT_SYMBOL(transport_deregister_session);
531 static void target_remove_from_state_list(struct se_cmd *cmd)
533 struct se_device *dev = cmd->se_dev;
539 if (cmd->transport_state & CMD_T_BUSY)
542 spin_lock_irqsave(&dev->execute_task_lock, flags);
543 if (cmd->state_active) {
544 list_del(&cmd->state_list);
545 cmd->state_active = false;
547 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
550 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
555 if (remove_from_lists) {
556 target_remove_from_state_list(cmd);
559 * Clear struct se_cmd->se_lun before the handoff to FE.
564 spin_lock_irqsave(&cmd->t_state_lock, flags);
566 cmd->t_state = TRANSPORT_WRITE_PENDING;
569 * Determine if frontend context caller is requesting the stopping of
570 * this command for frontend exceptions.
572 if (cmd->transport_state & CMD_T_STOP) {
573 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
574 __func__, __LINE__, cmd->tag);
576 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
578 complete_all(&cmd->t_transport_stop_comp);
582 cmd->transport_state &= ~CMD_T_ACTIVE;
583 if (remove_from_lists) {
585 * Some fabric modules like tcm_loop can release
586 * their internally allocated I/O reference now and
589 * Fabric modules are expected to return '1' here if the
590 * se_cmd being passed is released at this point,
591 * or zero if not being released.
593 if (cmd->se_tfo->check_stop_free != NULL) {
594 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
595 return cmd->se_tfo->check_stop_free(cmd);
599 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
603 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
605 return transport_cmd_check_stop(cmd, true, false);
608 static void transport_lun_remove_cmd(struct se_cmd *cmd)
610 struct se_lun *lun = cmd->se_lun;
615 if (cmpxchg(&cmd->lun_ref_active, true, false))
616 percpu_ref_put(&lun->lun_ref);
619 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
621 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
623 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
624 transport_lun_remove_cmd(cmd);
626 * Allow the fabric driver to unmap any resources before
627 * releasing the descriptor via TFO->release_cmd()
630 cmd->se_tfo->aborted_task(cmd);
632 if (transport_cmd_check_stop_to_fabric(cmd))
634 if (remove && ack_kref)
635 transport_put_cmd(cmd);
638 static void target_complete_failure_work(struct work_struct *work)
640 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
642 transport_generic_request_failure(cmd,
643 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
647 * Used when asking transport to copy Sense Data from the underlying
648 * Linux/SCSI struct scsi_cmnd
650 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
652 struct se_device *dev = cmd->se_dev;
654 WARN_ON(!cmd->se_lun);
659 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
662 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
664 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
665 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
666 return cmd->sense_buffer;
669 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
671 struct se_device *dev = cmd->se_dev;
672 int success = scsi_status == GOOD;
675 cmd->scsi_status = scsi_status;
678 spin_lock_irqsave(&cmd->t_state_lock, flags);
679 cmd->transport_state &= ~CMD_T_BUSY;
681 if (dev && dev->transport->transport_complete) {
682 dev->transport->transport_complete(cmd,
684 transport_get_sense_buffer(cmd));
685 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
690 * See if we are waiting to complete for an exception condition.
692 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
693 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
694 complete(&cmd->task_stop_comp);
699 * Check for case where an explicit ABORT_TASK has been received
700 * and transport_wait_for_tasks() will be waiting for completion..
702 if (cmd->transport_state & CMD_T_ABORTED ||
703 cmd->transport_state & CMD_T_STOP) {
704 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
705 complete_all(&cmd->t_transport_stop_comp);
707 } else if (!success) {
708 INIT_WORK(&cmd->work, target_complete_failure_work);
710 INIT_WORK(&cmd->work, target_complete_ok_work);
713 cmd->t_state = TRANSPORT_COMPLETE;
714 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
715 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
717 queue_work(target_completion_wq, &cmd->work);
719 EXPORT_SYMBOL(target_complete_cmd);
721 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
723 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
724 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
725 cmd->residual_count += cmd->data_length - length;
727 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
728 cmd->residual_count = cmd->data_length - length;
731 cmd->data_length = length;
734 target_complete_cmd(cmd, scsi_status);
736 EXPORT_SYMBOL(target_complete_cmd_with_length);
738 static void target_add_to_state_list(struct se_cmd *cmd)
740 struct se_device *dev = cmd->se_dev;
743 spin_lock_irqsave(&dev->execute_task_lock, flags);
744 if (!cmd->state_active) {
745 list_add_tail(&cmd->state_list, &dev->state_list);
746 cmd->state_active = true;
748 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
752 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
754 static void transport_write_pending_qf(struct se_cmd *cmd);
755 static void transport_complete_qf(struct se_cmd *cmd);
757 void target_qf_do_work(struct work_struct *work)
759 struct se_device *dev = container_of(work, struct se_device,
761 LIST_HEAD(qf_cmd_list);
762 struct se_cmd *cmd, *cmd_tmp;
764 spin_lock_irq(&dev->qf_cmd_lock);
765 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
766 spin_unlock_irq(&dev->qf_cmd_lock);
768 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
769 list_del(&cmd->se_qf_node);
770 atomic_dec_mb(&dev->dev_qf_count);
772 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
773 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
774 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
775 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
778 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
779 transport_write_pending_qf(cmd);
780 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
781 transport_complete_qf(cmd);
785 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
787 switch (cmd->data_direction) {
790 case DMA_FROM_DEVICE:
794 case DMA_BIDIRECTIONAL:
803 void transport_dump_dev_state(
804 struct se_device *dev,
808 *bl += sprintf(b + *bl, "Status: ");
809 if (dev->export_count)
810 *bl += sprintf(b + *bl, "ACTIVATED");
812 *bl += sprintf(b + *bl, "DEACTIVATED");
814 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
815 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
816 dev->dev_attrib.block_size,
817 dev->dev_attrib.hw_max_sectors);
818 *bl += sprintf(b + *bl, " ");
821 void transport_dump_vpd_proto_id(
823 unsigned char *p_buf,
826 unsigned char buf[VPD_TMP_BUF_SIZE];
829 memset(buf, 0, VPD_TMP_BUF_SIZE);
830 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
832 switch (vpd->protocol_identifier) {
834 sprintf(buf+len, "Fibre Channel\n");
837 sprintf(buf+len, "Parallel SCSI\n");
840 sprintf(buf+len, "SSA\n");
843 sprintf(buf+len, "IEEE 1394\n");
846 sprintf(buf+len, "SCSI Remote Direct Memory Access"
850 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
853 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
856 sprintf(buf+len, "Automation/Drive Interface Transport"
860 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
863 sprintf(buf+len, "Unknown 0x%02x\n",
864 vpd->protocol_identifier);
869 strncpy(p_buf, buf, p_buf_len);
875 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
878 * Check if the Protocol Identifier Valid (PIV) bit is set..
880 * from spc3r23.pdf section 7.5.1
882 if (page_83[1] & 0x80) {
883 vpd->protocol_identifier = (page_83[0] & 0xf0);
884 vpd->protocol_identifier_set = 1;
885 transport_dump_vpd_proto_id(vpd, NULL, 0);
888 EXPORT_SYMBOL(transport_set_vpd_proto_id);
890 int transport_dump_vpd_assoc(
892 unsigned char *p_buf,
895 unsigned char buf[VPD_TMP_BUF_SIZE];
899 memset(buf, 0, VPD_TMP_BUF_SIZE);
900 len = sprintf(buf, "T10 VPD Identifier Association: ");
902 switch (vpd->association) {
904 sprintf(buf+len, "addressed logical unit\n");
907 sprintf(buf+len, "target port\n");
910 sprintf(buf+len, "SCSI target device\n");
913 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
919 strncpy(p_buf, buf, p_buf_len);
926 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
929 * The VPD identification association..
931 * from spc3r23.pdf Section 7.6.3.1 Table 297
933 vpd->association = (page_83[1] & 0x30);
934 return transport_dump_vpd_assoc(vpd, NULL, 0);
936 EXPORT_SYMBOL(transport_set_vpd_assoc);
938 int transport_dump_vpd_ident_type(
940 unsigned char *p_buf,
943 unsigned char buf[VPD_TMP_BUF_SIZE];
947 memset(buf, 0, VPD_TMP_BUF_SIZE);
948 len = sprintf(buf, "T10 VPD Identifier Type: ");
950 switch (vpd->device_identifier_type) {
952 sprintf(buf+len, "Vendor specific\n");
955 sprintf(buf+len, "T10 Vendor ID based\n");
958 sprintf(buf+len, "EUI-64 based\n");
961 sprintf(buf+len, "NAA\n");
964 sprintf(buf+len, "Relative target port identifier\n");
967 sprintf(buf+len, "SCSI name string\n");
970 sprintf(buf+len, "Unsupported: 0x%02x\n",
971 vpd->device_identifier_type);
977 if (p_buf_len < strlen(buf)+1)
979 strncpy(p_buf, buf, p_buf_len);
987 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
990 * The VPD identifier type..
992 * from spc3r23.pdf Section 7.6.3.1 Table 298
994 vpd->device_identifier_type = (page_83[1] & 0x0f);
995 return transport_dump_vpd_ident_type(vpd, NULL, 0);
997 EXPORT_SYMBOL(transport_set_vpd_ident_type);
999 int transport_dump_vpd_ident(
1000 struct t10_vpd *vpd,
1001 unsigned char *p_buf,
1004 unsigned char buf[VPD_TMP_BUF_SIZE];
1007 memset(buf, 0, VPD_TMP_BUF_SIZE);
1009 switch (vpd->device_identifier_code_set) {
1010 case 0x01: /* Binary */
1011 snprintf(buf, sizeof(buf),
1012 "T10 VPD Binary Device Identifier: %s\n",
1013 &vpd->device_identifier[0]);
1015 case 0x02: /* ASCII */
1016 snprintf(buf, sizeof(buf),
1017 "T10 VPD ASCII Device Identifier: %s\n",
1018 &vpd->device_identifier[0]);
1020 case 0x03: /* UTF-8 */
1021 snprintf(buf, sizeof(buf),
1022 "T10 VPD UTF-8 Device Identifier: %s\n",
1023 &vpd->device_identifier[0]);
1026 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1027 " 0x%02x", vpd->device_identifier_code_set);
1033 strncpy(p_buf, buf, p_buf_len);
1035 pr_debug("%s", buf);
1041 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1043 static const char hex_str[] = "0123456789abcdef";
1044 int j = 0, i = 4; /* offset to start of the identifier */
1047 * The VPD Code Set (encoding)
1049 * from spc3r23.pdf Section 7.6.3.1 Table 296
1051 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1052 switch (vpd->device_identifier_code_set) {
1053 case 0x01: /* Binary */
1054 vpd->device_identifier[j++] =
1055 hex_str[vpd->device_identifier_type];
1056 while (i < (4 + page_83[3])) {
1057 vpd->device_identifier[j++] =
1058 hex_str[(page_83[i] & 0xf0) >> 4];
1059 vpd->device_identifier[j++] =
1060 hex_str[page_83[i] & 0x0f];
1064 case 0x02: /* ASCII */
1065 case 0x03: /* UTF-8 */
1066 while (i < (4 + page_83[3]))
1067 vpd->device_identifier[j++] = page_83[i++];
1073 return transport_dump_vpd_ident(vpd, NULL, 0);
1075 EXPORT_SYMBOL(transport_set_vpd_ident);
1077 static sense_reason_t
1078 target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1083 if (!cmd->se_tfo->max_data_sg_nents)
1084 return TCM_NO_SENSE;
1086 * Check if fabric enforced maximum SGL entries per I/O descriptor
1087 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1088 * residual_count and reduce original cmd->data_length to maximum
1089 * length based on single PAGE_SIZE entry scatter-lists.
1091 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1092 if (cmd->data_length > mtl) {
1094 * If an existing CDB overflow is present, calculate new residual
1095 * based on CDB size minus fabric maximum transfer length.
1097 * If an existing CDB underflow is present, calculate new residual
1098 * based on original cmd->data_length minus fabric maximum transfer
1101 * Otherwise, set the underflow residual based on cmd->data_length
1102 * minus fabric maximum transfer length.
1104 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1105 cmd->residual_count = (size - mtl);
1106 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1107 u32 orig_dl = size + cmd->residual_count;
1108 cmd->residual_count = (orig_dl - mtl);
1110 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1111 cmd->residual_count = (cmd->data_length - mtl);
1113 cmd->data_length = mtl;
1115 * Reset sbc_check_prot() calculated protection payload
1116 * length based upon the new smaller MTL.
1118 if (cmd->prot_length) {
1119 u32 sectors = (mtl / dev->dev_attrib.block_size);
1120 cmd->prot_length = dev->prot_length * sectors;
1123 return TCM_NO_SENSE;
1127 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1129 struct se_device *dev = cmd->se_dev;
1131 if (cmd->unknown_data_length) {
1132 cmd->data_length = size;
1133 } else if (size != cmd->data_length) {
1134 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1135 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1136 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1137 cmd->data_length, size, cmd->t_task_cdb[0]);
1139 if (cmd->data_direction == DMA_TO_DEVICE &&
1140 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1141 pr_err("Rejecting underflow/overflow WRITE data\n");
1142 return TCM_INVALID_CDB_FIELD;
1145 * Reject READ_* or WRITE_* with overflow/underflow for
1146 * type SCF_SCSI_DATA_CDB.
1148 if (dev->dev_attrib.block_size != 512) {
1149 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1150 " CDB on non 512-byte sector setup subsystem"
1151 " plugin: %s\n", dev->transport->name);
1152 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1153 return TCM_INVALID_CDB_FIELD;
1156 * For the overflow case keep the existing fabric provided
1157 * ->data_length. Otherwise for the underflow case, reset
1158 * ->data_length to the smaller SCSI expected data transfer
1161 if (size > cmd->data_length) {
1162 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1163 cmd->residual_count = (size - cmd->data_length);
1165 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1166 cmd->residual_count = (cmd->data_length - size);
1167 cmd->data_length = size;
1171 return target_check_max_data_sg_nents(cmd, dev, size);
1176 * Used by fabric modules containing a local struct se_cmd within their
1177 * fabric dependent per I/O descriptor.
1179 * Preserves the value of @cmd->tag.
1181 void transport_init_se_cmd(
1183 const struct target_core_fabric_ops *tfo,
1184 struct se_session *se_sess,
1188 unsigned char *sense_buffer)
1190 INIT_LIST_HEAD(&cmd->se_delayed_node);
1191 INIT_LIST_HEAD(&cmd->se_qf_node);
1192 INIT_LIST_HEAD(&cmd->se_cmd_list);
1193 INIT_LIST_HEAD(&cmd->state_list);
1194 init_completion(&cmd->t_transport_stop_comp);
1195 init_completion(&cmd->cmd_wait_comp);
1196 init_completion(&cmd->task_stop_comp);
1197 spin_lock_init(&cmd->t_state_lock);
1198 kref_init(&cmd->cmd_kref);
1199 cmd->transport_state = CMD_T_DEV_ACTIVE;
1202 cmd->se_sess = se_sess;
1203 cmd->data_length = data_length;
1204 cmd->data_direction = data_direction;
1205 cmd->sam_task_attr = task_attr;
1206 cmd->sense_buffer = sense_buffer;
1208 cmd->state_active = false;
1210 EXPORT_SYMBOL(transport_init_se_cmd);
1212 static sense_reason_t
1213 transport_check_alloc_task_attr(struct se_cmd *cmd)
1215 struct se_device *dev = cmd->se_dev;
1218 * Check if SAM Task Attribute emulation is enabled for this
1219 * struct se_device storage object
1221 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1224 if (cmd->sam_task_attr == TCM_ACA_TAG) {
1225 pr_debug("SAM Task Attribute ACA"
1226 " emulation is not supported\n");
1227 return TCM_INVALID_CDB_FIELD;
1234 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1236 struct se_device *dev = cmd->se_dev;
1240 * Ensure that the received CDB is less than the max (252 + 8) bytes
1241 * for VARIABLE_LENGTH_CMD
1243 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1244 pr_err("Received SCSI CDB with command_size: %d that"
1245 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1246 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1247 return TCM_INVALID_CDB_FIELD;
1250 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1251 * allocate the additional extended CDB buffer now.. Otherwise
1252 * setup the pointer from __t_task_cdb to t_task_cdb.
1254 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1255 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1257 if (!cmd->t_task_cdb) {
1258 pr_err("Unable to allocate cmd->t_task_cdb"
1259 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1260 scsi_command_size(cdb),
1261 (unsigned long)sizeof(cmd->__t_task_cdb));
1262 return TCM_OUT_OF_RESOURCES;
1265 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1267 * Copy the original CDB into cmd->
1269 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1271 trace_target_sequencer_start(cmd);
1273 ret = dev->transport->parse_cdb(cmd);
1274 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1275 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1276 cmd->se_tfo->get_fabric_name(),
1277 cmd->se_sess->se_node_acl->initiatorname,
1278 cmd->t_task_cdb[0]);
1282 ret = transport_check_alloc_task_attr(cmd);
1286 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1287 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
1290 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1293 * Used by fabric module frontends to queue tasks directly.
1294 * Many only be used from process context only
1296 int transport_handle_cdb_direct(
1303 pr_err("cmd->se_lun is NULL\n");
1306 if (in_interrupt()) {
1308 pr_err("transport_generic_handle_cdb cannot be called"
1309 " from interrupt context\n");
1313 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1314 * outstanding descriptors are handled correctly during shutdown via
1315 * transport_wait_for_tasks()
1317 * Also, we don't take cmd->t_state_lock here as we only expect
1318 * this to be called for initial descriptor submission.
1320 cmd->t_state = TRANSPORT_NEW_CMD;
1321 cmd->transport_state |= CMD_T_ACTIVE;
1324 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1325 * so follow TRANSPORT_NEW_CMD processing thread context usage
1326 * and call transport_generic_request_failure() if necessary..
1328 ret = transport_generic_new_cmd(cmd);
1330 transport_generic_request_failure(cmd, ret);
1333 EXPORT_SYMBOL(transport_handle_cdb_direct);
1336 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1337 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1339 if (!sgl || !sgl_count)
1343 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1344 * scatterlists already have been set to follow what the fabric
1345 * passes for the original expected data transfer length.
1347 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1348 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1349 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1350 return TCM_INVALID_CDB_FIELD;
1353 cmd->t_data_sg = sgl;
1354 cmd->t_data_nents = sgl_count;
1355 cmd->t_bidi_data_sg = sgl_bidi;
1356 cmd->t_bidi_data_nents = sgl_bidi_count;
1358 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1363 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1364 * se_cmd + use pre-allocated SGL memory.
1366 * @se_cmd: command descriptor to submit
1367 * @se_sess: associated se_sess for endpoint
1368 * @cdb: pointer to SCSI CDB
1369 * @sense: pointer to SCSI sense buffer
1370 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1371 * @data_length: fabric expected data transfer length
1372 * @task_addr: SAM task attribute
1373 * @data_dir: DMA data direction
1374 * @flags: flags for command submission from target_sc_flags_tables
1375 * @sgl: struct scatterlist memory for unidirectional mapping
1376 * @sgl_count: scatterlist count for unidirectional mapping
1377 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1378 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1379 * @sgl_prot: struct scatterlist memory protection information
1380 * @sgl_prot_count: scatterlist count for protection information
1382 * Task tags are supported if the caller has set @se_cmd->tag.
1384 * Returns non zero to signal active I/O shutdown failure. All other
1385 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1386 * but still return zero here.
1388 * This may only be called from process context, and also currently
1389 * assumes internal allocation of fabric payload buffer by target-core.
1391 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1392 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1393 u32 data_length, int task_attr, int data_dir, int flags,
1394 struct scatterlist *sgl, u32 sgl_count,
1395 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1396 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1398 struct se_portal_group *se_tpg;
1402 se_tpg = se_sess->se_tpg;
1404 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1405 BUG_ON(in_interrupt());
1407 * Initialize se_cmd for target operation. From this point
1408 * exceptions are handled by sending exception status via
1409 * target_core_fabric_ops->queue_status() callback
1411 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1412 data_length, data_dir, task_attr, sense);
1413 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1414 se_cmd->unknown_data_length = 1;
1416 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1417 * se_sess->sess_cmd_list. A second kref_get here is necessary
1418 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1419 * kref_put() to happen during fabric packet acknowledgement.
1421 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1425 * Signal bidirectional data payloads to target-core
1427 if (flags & TARGET_SCF_BIDI_OP)
1428 se_cmd->se_cmd_flags |= SCF_BIDI;
1430 * Locate se_lun pointer and attach it to struct se_cmd
1432 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1434 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1435 target_put_sess_cmd(se_cmd);
1439 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1441 transport_generic_request_failure(se_cmd, rc);
1446 * Save pointers for SGLs containing protection information,
1449 if (sgl_prot_count) {
1450 se_cmd->t_prot_sg = sgl_prot;
1451 se_cmd->t_prot_nents = sgl_prot_count;
1452 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
1456 * When a non zero sgl_count has been passed perform SGL passthrough
1457 * mapping for pre-allocated fabric memory instead of having target
1458 * core perform an internal SGL allocation..
1460 if (sgl_count != 0) {
1464 * A work-around for tcm_loop as some userspace code via
1465 * scsi-generic do not memset their associated read buffers,
1466 * so go ahead and do that here for type non-data CDBs. Also
1467 * note that this is currently guaranteed to be a single SGL
1468 * for this case by target core in target_setup_cmd_from_cdb()
1469 * -> transport_generic_cmd_sequencer().
1471 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1472 se_cmd->data_direction == DMA_FROM_DEVICE) {
1473 unsigned char *buf = NULL;
1476 buf = kmap(sg_page(sgl)) + sgl->offset;
1479 memset(buf, 0, sgl->length);
1480 kunmap(sg_page(sgl));
1484 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1485 sgl_bidi, sgl_bidi_count);
1487 transport_generic_request_failure(se_cmd, rc);
1493 * Check if we need to delay processing because of ALUA
1494 * Active/NonOptimized primary access state..
1496 core_alua_check_nonop_delay(se_cmd);
1498 transport_handle_cdb_direct(se_cmd);
1501 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1504 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1506 * @se_cmd: command descriptor to submit
1507 * @se_sess: associated se_sess for endpoint
1508 * @cdb: pointer to SCSI CDB
1509 * @sense: pointer to SCSI sense buffer
1510 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1511 * @data_length: fabric expected data transfer length
1512 * @task_addr: SAM task attribute
1513 * @data_dir: DMA data direction
1514 * @flags: flags for command submission from target_sc_flags_tables
1516 * Task tags are supported if the caller has set @se_cmd->tag.
1518 * Returns non zero to signal active I/O shutdown failure. All other
1519 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1520 * but still return zero here.
1522 * This may only be called from process context, and also currently
1523 * assumes internal allocation of fabric payload buffer by target-core.
1525 * It also assumes interal target core SGL memory allocation.
1527 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1528 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1529 u32 data_length, int task_attr, int data_dir, int flags)
1531 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1532 unpacked_lun, data_length, task_attr, data_dir,
1533 flags, NULL, 0, NULL, 0, NULL, 0);
1535 EXPORT_SYMBOL(target_submit_cmd);
1537 static void target_complete_tmr_failure(struct work_struct *work)
1539 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1541 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1542 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1544 transport_cmd_check_stop_to_fabric(se_cmd);
1548 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1551 * @se_cmd: command descriptor to submit
1552 * @se_sess: associated se_sess for endpoint
1553 * @sense: pointer to SCSI sense buffer
1554 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1555 * @fabric_context: fabric context for TMR req
1556 * @tm_type: Type of TM request
1557 * @gfp: gfp type for caller
1558 * @tag: referenced task tag for TMR_ABORT_TASK
1559 * @flags: submit cmd flags
1561 * Callable from all contexts.
1564 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1565 unsigned char *sense, u64 unpacked_lun,
1566 void *fabric_tmr_ptr, unsigned char tm_type,
1567 gfp_t gfp, unsigned int tag, int flags)
1569 struct se_portal_group *se_tpg;
1572 se_tpg = se_sess->se_tpg;
1575 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1576 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
1578 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1579 * allocation failure.
1581 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1585 if (tm_type == TMR_ABORT_TASK)
1586 se_cmd->se_tmr_req->ref_task_tag = tag;
1588 /* See target_submit_cmd for commentary */
1589 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1591 core_tmr_release_req(se_cmd->se_tmr_req);
1595 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1598 * For callback during failure handling, push this work off
1599 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1601 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1602 schedule_work(&se_cmd->work);
1605 transport_generic_handle_tmr(se_cmd);
1608 EXPORT_SYMBOL(target_submit_tmr);
1611 * If the cmd is active, request it to be stopped and sleep until it
1614 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1615 __releases(&cmd->t_state_lock)
1616 __acquires(&cmd->t_state_lock)
1618 bool was_active = false;
1620 if (cmd->transport_state & CMD_T_BUSY) {
1621 cmd->transport_state |= CMD_T_REQUEST_STOP;
1622 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1624 pr_debug("cmd %p waiting to complete\n", cmd);
1625 wait_for_completion(&cmd->task_stop_comp);
1626 pr_debug("cmd %p stopped successfully\n", cmd);
1628 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1629 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1630 cmd->transport_state &= ~CMD_T_BUSY;
1638 * Handle SAM-esque emulation for generic transport request failures.
1640 void transport_generic_request_failure(struct se_cmd *cmd,
1641 sense_reason_t sense_reason)
1643 int ret = 0, post_ret = 0;
1645 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1646 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
1647 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1648 cmd->se_tfo->get_cmd_state(cmd),
1649 cmd->t_state, sense_reason);
1650 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1651 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1652 (cmd->transport_state & CMD_T_STOP) != 0,
1653 (cmd->transport_state & CMD_T_SENT) != 0);
1656 * For SAM Task Attribute emulation for failed struct se_cmd
1658 transport_complete_task_attr(cmd);
1660 * Handle special case for COMPARE_AND_WRITE failure, where the
1661 * callback is expected to drop the per device ->caw_sem.
1663 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1664 cmd->transport_complete_callback)
1665 cmd->transport_complete_callback(cmd, false, &post_ret);
1667 switch (sense_reason) {
1668 case TCM_NON_EXISTENT_LUN:
1669 case TCM_UNSUPPORTED_SCSI_OPCODE:
1670 case TCM_INVALID_CDB_FIELD:
1671 case TCM_INVALID_PARAMETER_LIST:
1672 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1673 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1674 case TCM_UNKNOWN_MODE_PAGE:
1675 case TCM_WRITE_PROTECTED:
1676 case TCM_ADDRESS_OUT_OF_RANGE:
1677 case TCM_CHECK_CONDITION_ABORT_CMD:
1678 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1679 case TCM_CHECK_CONDITION_NOT_READY:
1680 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1681 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1682 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1684 case TCM_OUT_OF_RESOURCES:
1685 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1687 case TCM_RESERVATION_CONFLICT:
1689 * No SENSE Data payload for this case, set SCSI Status
1690 * and queue the response to $FABRIC_MOD.
1692 * Uses linux/include/scsi/scsi.h SAM status codes defs
1694 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1696 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1697 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1700 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1703 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1704 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1705 cmd->orig_fe_lun, 0x2C,
1706 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1708 trace_target_cmd_complete(cmd);
1709 ret = cmd->se_tfo->queue_status(cmd);
1710 if (ret == -EAGAIN || ret == -ENOMEM)
1714 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1715 cmd->t_task_cdb[0], sense_reason);
1716 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1720 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1721 if (ret == -EAGAIN || ret == -ENOMEM)
1725 transport_lun_remove_cmd(cmd);
1726 transport_cmd_check_stop_to_fabric(cmd);
1730 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1731 transport_handle_queue_full(cmd, cmd->se_dev);
1733 EXPORT_SYMBOL(transport_generic_request_failure);
1735 void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
1739 if (!cmd->execute_cmd) {
1740 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1745 * Check for an existing UNIT ATTENTION condition after
1746 * target_handle_task_attr() has done SAM task attr
1747 * checking, and possibly have already defered execution
1748 * out to target_restart_delayed_cmds() context.
1750 ret = target_scsi3_ua_check(cmd);
1754 ret = target_alua_state_check(cmd);
1758 ret = target_check_reservation(cmd);
1760 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1765 ret = cmd->execute_cmd(cmd);
1769 spin_lock_irq(&cmd->t_state_lock);
1770 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1771 spin_unlock_irq(&cmd->t_state_lock);
1773 transport_generic_request_failure(cmd, ret);
1776 static int target_write_prot_action(struct se_cmd *cmd)
1780 * Perform WRITE_INSERT of PI using software emulation when backend
1781 * device has PI enabled, if the transport has not already generated
1782 * PI using hardware WRITE_INSERT offload.
1784 switch (cmd->prot_op) {
1785 case TARGET_PROT_DOUT_INSERT:
1786 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1787 sbc_dif_generate(cmd);
1789 case TARGET_PROT_DOUT_STRIP:
1790 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1793 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
1794 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1795 sectors, 0, cmd->t_prot_sg, 0);
1796 if (unlikely(cmd->pi_err)) {
1797 spin_lock_irq(&cmd->t_state_lock);
1798 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1799 spin_unlock_irq(&cmd->t_state_lock);
1800 transport_generic_request_failure(cmd, cmd->pi_err);
1811 static bool target_handle_task_attr(struct se_cmd *cmd)
1813 struct se_device *dev = cmd->se_dev;
1815 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1819 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1820 * to allow the passed struct se_cmd list of tasks to the front of the list.
1822 switch (cmd->sam_task_attr) {
1824 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1825 cmd->t_task_cdb[0]);
1827 case TCM_ORDERED_TAG:
1828 atomic_inc_mb(&dev->dev_ordered_sync);
1830 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1831 cmd->t_task_cdb[0]);
1834 * Execute an ORDERED command if no other older commands
1835 * exist that need to be completed first.
1837 if (!atomic_read(&dev->simple_cmds))
1842 * For SIMPLE and UNTAGGED Task Attribute commands
1844 atomic_inc_mb(&dev->simple_cmds);
1848 if (atomic_read(&dev->dev_ordered_sync) == 0)
1851 spin_lock(&dev->delayed_cmd_lock);
1852 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1853 spin_unlock(&dev->delayed_cmd_lock);
1855 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1856 cmd->t_task_cdb[0], cmd->sam_task_attr);
1860 static int __transport_check_aborted_status(struct se_cmd *, int);
1862 void target_execute_cmd(struct se_cmd *cmd)
1865 * Determine if frontend context caller is requesting the stopping of
1866 * this command for frontend exceptions.
1868 * If the received CDB has aleady been aborted stop processing it here.
1870 spin_lock_irq(&cmd->t_state_lock);
1871 if (__transport_check_aborted_status(cmd, 1)) {
1872 spin_unlock_irq(&cmd->t_state_lock);
1875 if (cmd->transport_state & CMD_T_STOP) {
1876 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1877 __func__, __LINE__, cmd->tag);
1879 spin_unlock_irq(&cmd->t_state_lock);
1880 complete_all(&cmd->t_transport_stop_comp);
1884 cmd->t_state = TRANSPORT_PROCESSING;
1885 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1886 spin_unlock_irq(&cmd->t_state_lock);
1888 if (target_write_prot_action(cmd))
1891 if (target_handle_task_attr(cmd)) {
1892 spin_lock_irq(&cmd->t_state_lock);
1893 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1894 spin_unlock_irq(&cmd->t_state_lock);
1898 __target_execute_cmd(cmd, true);
1900 EXPORT_SYMBOL(target_execute_cmd);
1903 * Process all commands up to the last received ORDERED task attribute which
1904 * requires another blocking boundary
1906 static void target_restart_delayed_cmds(struct se_device *dev)
1911 spin_lock(&dev->delayed_cmd_lock);
1912 if (list_empty(&dev->delayed_cmd_list)) {
1913 spin_unlock(&dev->delayed_cmd_lock);
1917 cmd = list_entry(dev->delayed_cmd_list.next,
1918 struct se_cmd, se_delayed_node);
1919 list_del(&cmd->se_delayed_node);
1920 spin_unlock(&dev->delayed_cmd_lock);
1922 __target_execute_cmd(cmd, true);
1924 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
1930 * Called from I/O completion to determine which dormant/delayed
1931 * and ordered cmds need to have their tasks added to the execution queue.
1933 static void transport_complete_task_attr(struct se_cmd *cmd)
1935 struct se_device *dev = cmd->se_dev;
1937 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1940 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
1941 atomic_dec_mb(&dev->simple_cmds);
1942 dev->dev_cur_ordered_id++;
1943 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1944 dev->dev_cur_ordered_id);
1945 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
1946 dev->dev_cur_ordered_id++;
1947 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1948 dev->dev_cur_ordered_id);
1949 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
1950 atomic_dec_mb(&dev->dev_ordered_sync);
1952 dev->dev_cur_ordered_id++;
1953 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1954 dev->dev_cur_ordered_id);
1957 target_restart_delayed_cmds(dev);
1960 static void transport_complete_qf(struct se_cmd *cmd)
1964 transport_complete_task_attr(cmd);
1966 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1967 trace_target_cmd_complete(cmd);
1968 ret = cmd->se_tfo->queue_status(cmd);
1972 switch (cmd->data_direction) {
1973 case DMA_FROM_DEVICE:
1974 trace_target_cmd_complete(cmd);
1975 ret = cmd->se_tfo->queue_data_in(cmd);
1978 if (cmd->se_cmd_flags & SCF_BIDI) {
1979 ret = cmd->se_tfo->queue_data_in(cmd);
1982 /* Fall through for DMA_TO_DEVICE */
1984 trace_target_cmd_complete(cmd);
1985 ret = cmd->se_tfo->queue_status(cmd);
1993 transport_handle_queue_full(cmd, cmd->se_dev);
1996 transport_lun_remove_cmd(cmd);
1997 transport_cmd_check_stop_to_fabric(cmd);
2000 static void transport_handle_queue_full(
2002 struct se_device *dev)
2004 spin_lock_irq(&dev->qf_cmd_lock);
2005 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2006 atomic_inc_mb(&dev->dev_qf_count);
2007 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2009 schedule_work(&cmd->se_dev->qf_work_queue);
2012 static bool target_read_prot_action(struct se_cmd *cmd)
2014 switch (cmd->prot_op) {
2015 case TARGET_PROT_DIN_STRIP:
2016 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
2017 u32 sectors = cmd->data_length >>
2018 ilog2(cmd->se_dev->dev_attrib.block_size);
2020 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2021 sectors, 0, cmd->t_prot_sg,
2027 case TARGET_PROT_DIN_INSERT:
2028 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2031 sbc_dif_generate(cmd);
2040 static void target_complete_ok_work(struct work_struct *work)
2042 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2046 * Check if we need to move delayed/dormant tasks from cmds on the
2047 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2050 transport_complete_task_attr(cmd);
2053 * Check to schedule QUEUE_FULL work, or execute an existing
2054 * cmd->transport_qf_callback()
2056 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2057 schedule_work(&cmd->se_dev->qf_work_queue);
2060 * Check if we need to send a sense buffer from
2061 * the struct se_cmd in question.
2063 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2064 WARN_ON(!cmd->scsi_status);
2065 ret = transport_send_check_condition_and_sense(
2067 if (ret == -EAGAIN || ret == -ENOMEM)
2070 transport_lun_remove_cmd(cmd);
2071 transport_cmd_check_stop_to_fabric(cmd);
2075 * Check for a callback, used by amongst other things
2076 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
2078 if (cmd->transport_complete_callback) {
2080 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2081 bool zero_dl = !(cmd->data_length);
2084 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2085 if (!rc && !post_ret) {
2091 ret = transport_send_check_condition_and_sense(cmd,
2093 if (ret == -EAGAIN || ret == -ENOMEM)
2096 transport_lun_remove_cmd(cmd);
2097 transport_cmd_check_stop_to_fabric(cmd);
2103 switch (cmd->data_direction) {
2104 case DMA_FROM_DEVICE:
2105 atomic_long_add(cmd->data_length,
2106 &cmd->se_lun->lun_stats.tx_data_octets);
2108 * Perform READ_STRIP of PI using software emulation when
2109 * backend had PI enabled, if the transport will not be
2110 * performing hardware READ_STRIP offload.
2112 if (target_read_prot_action(cmd)) {
2113 ret = transport_send_check_condition_and_sense(cmd,
2115 if (ret == -EAGAIN || ret == -ENOMEM)
2118 transport_lun_remove_cmd(cmd);
2119 transport_cmd_check_stop_to_fabric(cmd);
2123 trace_target_cmd_complete(cmd);
2124 ret = cmd->se_tfo->queue_data_in(cmd);
2125 if (ret == -EAGAIN || ret == -ENOMEM)
2129 atomic_long_add(cmd->data_length,
2130 &cmd->se_lun->lun_stats.rx_data_octets);
2132 * Check if we need to send READ payload for BIDI-COMMAND
2134 if (cmd->se_cmd_flags & SCF_BIDI) {
2135 atomic_long_add(cmd->data_length,
2136 &cmd->se_lun->lun_stats.tx_data_octets);
2137 ret = cmd->se_tfo->queue_data_in(cmd);
2138 if (ret == -EAGAIN || ret == -ENOMEM)
2142 /* Fall through for DMA_TO_DEVICE */
2144 trace_target_cmd_complete(cmd);
2145 ret = cmd->se_tfo->queue_status(cmd);
2146 if (ret == -EAGAIN || ret == -ENOMEM)
2153 transport_lun_remove_cmd(cmd);
2154 transport_cmd_check_stop_to_fabric(cmd);
2158 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2159 " data_direction: %d\n", cmd, cmd->data_direction);
2160 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2161 transport_handle_queue_full(cmd, cmd->se_dev);
2164 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2166 struct scatterlist *sg;
2169 for_each_sg(sgl, sg, nents, count)
2170 __free_page(sg_page(sg));
2175 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2178 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2179 * emulation, and free + reset pointers if necessary..
2181 if (!cmd->t_data_sg_orig)
2184 kfree(cmd->t_data_sg);
2185 cmd->t_data_sg = cmd->t_data_sg_orig;
2186 cmd->t_data_sg_orig = NULL;
2187 cmd->t_data_nents = cmd->t_data_nents_orig;
2188 cmd->t_data_nents_orig = 0;
2191 static inline void transport_free_pages(struct se_cmd *cmd)
2193 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2194 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2195 cmd->t_prot_sg = NULL;
2196 cmd->t_prot_nents = 0;
2199 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2201 * Release special case READ buffer payload required for
2202 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2204 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2205 transport_free_sgl(cmd->t_bidi_data_sg,
2206 cmd->t_bidi_data_nents);
2207 cmd->t_bidi_data_sg = NULL;
2208 cmd->t_bidi_data_nents = 0;
2210 transport_reset_sgl_orig(cmd);
2213 transport_reset_sgl_orig(cmd);
2215 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2216 cmd->t_data_sg = NULL;
2217 cmd->t_data_nents = 0;
2219 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2220 cmd->t_bidi_data_sg = NULL;
2221 cmd->t_bidi_data_nents = 0;
2225 * transport_put_cmd - release a reference to a command
2226 * @cmd: command to release
2228 * This routine releases our reference to the command and frees it if possible.
2230 static int transport_put_cmd(struct se_cmd *cmd)
2232 BUG_ON(!cmd->se_tfo);
2234 * If this cmd has been setup with target_get_sess_cmd(), drop
2235 * the kref and call ->release_cmd() in kref callback.
2237 return target_put_sess_cmd(cmd);
2240 void *transport_kmap_data_sg(struct se_cmd *cmd)
2242 struct scatterlist *sg = cmd->t_data_sg;
2243 struct page **pages;
2247 * We need to take into account a possible offset here for fabrics like
2248 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2249 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2251 if (!cmd->t_data_nents)
2255 if (cmd->t_data_nents == 1)
2256 return kmap(sg_page(sg)) + sg->offset;
2258 /* >1 page. use vmap */
2259 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2263 /* convert sg[] to pages[] */
2264 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2265 pages[i] = sg_page(sg);
2268 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2270 if (!cmd->t_data_vmap)
2273 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2275 EXPORT_SYMBOL(transport_kmap_data_sg);
2277 void transport_kunmap_data_sg(struct se_cmd *cmd)
2279 if (!cmd->t_data_nents) {
2281 } else if (cmd->t_data_nents == 1) {
2282 kunmap(sg_page(cmd->t_data_sg));
2286 vunmap(cmd->t_data_vmap);
2287 cmd->t_data_vmap = NULL;
2289 EXPORT_SYMBOL(transport_kunmap_data_sg);
2292 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2295 struct scatterlist *sg;
2297 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2301 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2302 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2306 sg_init_table(sg, nent);
2309 u32 page_len = min_t(u32, length, PAGE_SIZE);
2310 page = alloc_page(GFP_KERNEL | zero_flag);
2314 sg_set_page(&sg[i], page, page_len, 0);
2325 __free_page(sg_page(&sg[i]));
2332 * Allocate any required resources to execute the command. For writes we
2333 * might not have the payload yet, so notify the fabric via a call to
2334 * ->write_pending instead. Otherwise place it on the execution queue.
2337 transport_generic_new_cmd(struct se_cmd *cmd)
2340 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2342 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2343 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2344 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2345 cmd->prot_length, true);
2347 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2351 * Determine is the TCM fabric module has already allocated physical
2352 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2355 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2358 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2359 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2362 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2363 bidi_length = cmd->t_task_nolb *
2364 cmd->se_dev->dev_attrib.block_size;
2366 bidi_length = cmd->data_length;
2368 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2369 &cmd->t_bidi_data_nents,
2370 bidi_length, zero_flag);
2372 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2375 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2376 cmd->data_length, zero_flag);
2378 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2379 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2382 * Special case for COMPARE_AND_WRITE with fabrics
2383 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2385 u32 caw_length = cmd->t_task_nolb *
2386 cmd->se_dev->dev_attrib.block_size;
2388 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2389 &cmd->t_bidi_data_nents,
2390 caw_length, zero_flag);
2392 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2395 * If this command is not a write we can execute it right here,
2396 * for write buffers we need to notify the fabric driver first
2397 * and let it call back once the write buffers are ready.
2399 target_add_to_state_list(cmd);
2400 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
2401 target_execute_cmd(cmd);
2404 transport_cmd_check_stop(cmd, false, true);
2406 ret = cmd->se_tfo->write_pending(cmd);
2407 if (ret == -EAGAIN || ret == -ENOMEM)
2410 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2413 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2416 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2417 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2418 transport_handle_queue_full(cmd, cmd->se_dev);
2421 EXPORT_SYMBOL(transport_generic_new_cmd);
2423 static void transport_write_pending_qf(struct se_cmd *cmd)
2427 ret = cmd->se_tfo->write_pending(cmd);
2428 if (ret == -EAGAIN || ret == -ENOMEM) {
2429 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2431 transport_handle_queue_full(cmd, cmd->se_dev);
2436 __transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2437 unsigned long *flags);
2439 static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2441 unsigned long flags;
2443 spin_lock_irqsave(&cmd->t_state_lock, flags);
2444 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2445 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2448 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2451 bool aborted = false, tas = false;
2453 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2454 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2455 target_wait_free_cmd(cmd, &aborted, &tas);
2457 if (!aborted || tas)
2458 ret = transport_put_cmd(cmd);
2461 target_wait_free_cmd(cmd, &aborted, &tas);
2463 * Handle WRITE failure case where transport_generic_new_cmd()
2464 * has already added se_cmd to state_list, but fabric has
2465 * failed command before I/O submission.
2467 if (cmd->state_active)
2468 target_remove_from_state_list(cmd);
2471 transport_lun_remove_cmd(cmd);
2473 if (!aborted || tas)
2474 ret = transport_put_cmd(cmd);
2477 * If the task has been internally aborted due to TMR ABORT_TASK
2478 * or LUN_RESET, target_core_tmr.c is responsible for performing
2479 * the remaining calls to target_put_sess_cmd(), and not the
2480 * callers of this function.
2483 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2484 wait_for_completion(&cmd->cmd_wait_comp);
2485 cmd->se_tfo->release_cmd(cmd);
2490 EXPORT_SYMBOL(transport_generic_free_cmd);
2492 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2493 * @se_cmd: command descriptor to add
2494 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2496 int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
2498 struct se_session *se_sess = se_cmd->se_sess;
2499 unsigned long flags;
2503 * Add a second kref if the fabric caller is expecting to handle
2504 * fabric acknowledgement that requires two target_put_sess_cmd()
2505 * invocations before se_cmd descriptor release.
2508 kref_get(&se_cmd->cmd_kref);
2510 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2511 if (se_sess->sess_tearing_down) {
2515 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2517 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2519 if (ret && ack_kref)
2520 target_put_sess_cmd(se_cmd);
2524 EXPORT_SYMBOL(target_get_sess_cmd);
2526 static void target_free_cmd_mem(struct se_cmd *cmd)
2528 transport_free_pages(cmd);
2530 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2531 core_tmr_release_req(cmd->se_tmr_req);
2532 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2533 kfree(cmd->t_task_cdb);
2536 static void target_release_cmd_kref(struct kref *kref)
2538 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2539 struct se_session *se_sess = se_cmd->se_sess;
2540 unsigned long flags;
2543 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2544 if (list_empty(&se_cmd->se_cmd_list)) {
2545 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2546 target_free_cmd_mem(se_cmd);
2547 se_cmd->se_tfo->release_cmd(se_cmd);
2551 spin_lock(&se_cmd->t_state_lock);
2552 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP);
2553 spin_unlock(&se_cmd->t_state_lock);
2555 if (se_cmd->cmd_wait_set || fabric_stop) {
2556 list_del_init(&se_cmd->se_cmd_list);
2557 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2558 target_free_cmd_mem(se_cmd);
2559 complete(&se_cmd->cmd_wait_comp);
2562 list_del_init(&se_cmd->se_cmd_list);
2563 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2565 target_free_cmd_mem(se_cmd);
2566 se_cmd->se_tfo->release_cmd(se_cmd);
2569 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2570 * @se_cmd: command descriptor to drop
2572 int target_put_sess_cmd(struct se_cmd *se_cmd)
2574 struct se_session *se_sess = se_cmd->se_sess;
2577 target_free_cmd_mem(se_cmd);
2578 se_cmd->se_tfo->release_cmd(se_cmd);
2581 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2583 EXPORT_SYMBOL(target_put_sess_cmd);
2585 /* target_sess_cmd_list_set_waiting - Flag all commands in
2586 * sess_cmd_list to complete cmd_wait_comp. Set
2587 * sess_tearing_down so no more commands are queued.
2588 * @se_sess: session to flag
2590 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2592 struct se_cmd *se_cmd;
2593 unsigned long flags;
2596 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2597 if (se_sess->sess_tearing_down) {
2598 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2601 se_sess->sess_tearing_down = 1;
2602 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2604 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) {
2605 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2607 se_cmd->cmd_wait_set = 1;
2608 spin_lock(&se_cmd->t_state_lock);
2609 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2610 spin_unlock(&se_cmd->t_state_lock);
2614 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2616 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2618 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2619 * @se_sess: session to wait for active I/O
2621 void target_wait_for_sess_cmds(struct se_session *se_sess)
2623 struct se_cmd *se_cmd, *tmp_cmd;
2624 unsigned long flags;
2627 list_for_each_entry_safe(se_cmd, tmp_cmd,
2628 &se_sess->sess_wait_list, se_cmd_list) {
2629 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2630 " %d\n", se_cmd, se_cmd->t_state,
2631 se_cmd->se_tfo->get_cmd_state(se_cmd));
2633 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2634 tas = (se_cmd->transport_state & CMD_T_TAS);
2635 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2637 if (!target_put_sess_cmd(se_cmd)) {
2639 target_put_sess_cmd(se_cmd);
2642 wait_for_completion(&se_cmd->cmd_wait_comp);
2643 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2644 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2645 se_cmd->se_tfo->get_cmd_state(se_cmd));
2647 se_cmd->se_tfo->release_cmd(se_cmd);
2650 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2651 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2652 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2655 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2657 void transport_clear_lun_ref(struct se_lun *lun)
2659 percpu_ref_kill(&lun->lun_ref);
2660 wait_for_completion(&lun->lun_ref_comp);
2664 __transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2665 bool *aborted, bool *tas, unsigned long *flags)
2666 __releases(&cmd->t_state_lock)
2667 __acquires(&cmd->t_state_lock)
2670 assert_spin_locked(&cmd->t_state_lock);
2671 WARN_ON_ONCE(!irqs_disabled());
2674 cmd->transport_state |= CMD_T_FABRIC_STOP;
2676 if (cmd->transport_state & CMD_T_ABORTED)
2679 if (cmd->transport_state & CMD_T_TAS)
2682 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2683 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2686 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2687 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2690 if (!(cmd->transport_state & CMD_T_ACTIVE))
2693 if (fabric_stop && *aborted)
2696 cmd->transport_state |= CMD_T_STOP;
2698 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2699 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2700 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2702 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
2704 wait_for_completion(&cmd->t_transport_stop_comp);
2706 spin_lock_irqsave(&cmd->t_state_lock, *flags);
2707 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2709 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2710 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
2716 * transport_wait_for_tasks - wait for completion to occur
2717 * @cmd: command to wait
2719 * Called from frontend fabric context to wait for storage engine
2720 * to pause and/or release frontend generated struct se_cmd.
2722 bool transport_wait_for_tasks(struct se_cmd *cmd)
2724 unsigned long flags;
2725 bool ret, aborted = false, tas = false;
2727 spin_lock_irqsave(&cmd->t_state_lock, flags);
2728 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
2729 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2733 EXPORT_SYMBOL(transport_wait_for_tasks);
2739 bool add_sector_info;
2742 static const struct sense_info sense_info_table[] = {
2746 [TCM_NON_EXISTENT_LUN] = {
2747 .key = ILLEGAL_REQUEST,
2748 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2750 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2751 .key = ILLEGAL_REQUEST,
2752 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2754 [TCM_SECTOR_COUNT_TOO_MANY] = {
2755 .key = ILLEGAL_REQUEST,
2756 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2758 [TCM_UNKNOWN_MODE_PAGE] = {
2759 .key = ILLEGAL_REQUEST,
2760 .asc = 0x24, /* INVALID FIELD IN CDB */
2762 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2763 .key = ABORTED_COMMAND,
2764 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2767 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2768 .key = ABORTED_COMMAND,
2769 .asc = 0x0c, /* WRITE ERROR */
2770 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2772 [TCM_INVALID_CDB_FIELD] = {
2773 .key = ILLEGAL_REQUEST,
2774 .asc = 0x24, /* INVALID FIELD IN CDB */
2776 [TCM_INVALID_PARAMETER_LIST] = {
2777 .key = ILLEGAL_REQUEST,
2778 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2780 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2781 .key = ILLEGAL_REQUEST,
2782 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2784 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2785 .key = ILLEGAL_REQUEST,
2786 .asc = 0x0c, /* WRITE ERROR */
2787 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2789 [TCM_SERVICE_CRC_ERROR] = {
2790 .key = ABORTED_COMMAND,
2791 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2792 .ascq = 0x05, /* N/A */
2794 [TCM_SNACK_REJECTED] = {
2795 .key = ABORTED_COMMAND,
2796 .asc = 0x11, /* READ ERROR */
2797 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2799 [TCM_WRITE_PROTECTED] = {
2800 .key = DATA_PROTECT,
2801 .asc = 0x27, /* WRITE PROTECTED */
2803 [TCM_ADDRESS_OUT_OF_RANGE] = {
2804 .key = ILLEGAL_REQUEST,
2805 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2807 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2808 .key = UNIT_ATTENTION,
2810 [TCM_CHECK_CONDITION_NOT_READY] = {
2813 [TCM_MISCOMPARE_VERIFY] = {
2815 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2818 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
2819 .key = ABORTED_COMMAND,
2821 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2822 .add_sector_info = true,
2824 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
2825 .key = ABORTED_COMMAND,
2827 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2828 .add_sector_info = true,
2830 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
2831 .key = ABORTED_COMMAND,
2833 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2834 .add_sector_info = true,
2836 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2838 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2839 * Solaris initiators. Returning NOT READY instead means the
2840 * operations will be retried a finite number of times and we
2841 * can survive intermittent errors.
2844 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2848 static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
2850 const struct sense_info *si;
2851 u8 *buffer = cmd->sense_buffer;
2852 int r = (__force int)reason;
2854 bool desc_format = target_sense_desc_format(cmd->se_dev);
2856 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2857 si = &sense_info_table[r];
2859 si = &sense_info_table[(__force int)
2860 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2862 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2863 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2864 WARN_ON_ONCE(asc == 0);
2865 } else if (si->asc == 0) {
2866 WARN_ON_ONCE(cmd->scsi_asc == 0);
2867 asc = cmd->scsi_asc;
2868 ascq = cmd->scsi_ascq;
2874 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
2875 if (si->add_sector_info)
2876 return scsi_set_sense_information(buffer,
2877 cmd->scsi_sense_length,
2884 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2885 sense_reason_t reason, int from_transport)
2887 unsigned long flags;
2889 spin_lock_irqsave(&cmd->t_state_lock, flags);
2890 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2891 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2894 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2895 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2897 if (!from_transport) {
2900 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2901 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2902 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2903 rc = translate_sense_reason(cmd, reason);
2908 trace_target_cmd_complete(cmd);
2909 return cmd->se_tfo->queue_status(cmd);
2911 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2913 static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2914 __releases(&cmd->t_state_lock)
2915 __acquires(&cmd->t_state_lock)
2917 assert_spin_locked(&cmd->t_state_lock);
2918 WARN_ON_ONCE(!irqs_disabled());
2920 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)) {
2928 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
2932 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
2933 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
2935 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
2936 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2937 trace_target_cmd_complete(cmd);
2939 spin_unlock_irq(&cmd->t_state_lock);
2940 cmd->se_tfo->queue_status(cmd);
2941 spin_lock_irq(&cmd->t_state_lock);
2946 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2950 spin_lock_irq(&cmd->t_state_lock);
2951 ret = __transport_check_aborted_status(cmd, send_status);
2952 spin_unlock_irq(&cmd->t_state_lock);
2956 EXPORT_SYMBOL(transport_check_aborted_status);
2958 void transport_send_task_abort(struct se_cmd *cmd)
2960 unsigned long flags;
2962 spin_lock_irqsave(&cmd->t_state_lock, flags);
2963 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
2964 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2967 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2970 * If there are still expected incoming fabric WRITEs, we wait
2971 * until until they have completed before sending a TASK_ABORTED
2972 * response. This response with TASK_ABORTED status will be
2973 * queued back to fabric module by transport_check_aborted_status().
2975 if (cmd->data_direction == DMA_TO_DEVICE) {
2976 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2977 spin_lock_irqsave(&cmd->t_state_lock, flags);
2978 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
2979 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2982 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
2983 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2988 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2990 transport_lun_remove_cmd(cmd);
2992 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
2993 cmd->t_task_cdb[0], cmd->tag);
2995 trace_target_cmd_complete(cmd);
2996 cmd->se_tfo->queue_status(cmd);
2999 static void target_tmr_work(struct work_struct *work)
3001 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3002 struct se_device *dev = cmd->se_dev;
3003 struct se_tmr_req *tmr = cmd->se_tmr_req;
3004 unsigned long flags;
3007 spin_lock_irqsave(&cmd->t_state_lock, flags);
3008 if (cmd->transport_state & CMD_T_ABORTED) {
3009 tmr->response = TMR_FUNCTION_REJECTED;
3010 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3013 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3015 switch (tmr->function) {
3016 case TMR_ABORT_TASK:
3017 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3019 case TMR_ABORT_TASK_SET:
3021 case TMR_CLEAR_TASK_SET:
3022 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3025 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3026 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3027 TMR_FUNCTION_REJECTED;
3028 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3029 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3030 cmd->orig_fe_lun, 0x29,
3031 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3034 case TMR_TARGET_WARM_RESET:
3035 tmr->response = TMR_FUNCTION_REJECTED;
3037 case TMR_TARGET_COLD_RESET:
3038 tmr->response = TMR_FUNCTION_REJECTED;
3041 pr_err("Uknown TMR function: 0x%02x.\n",
3043 tmr->response = TMR_FUNCTION_REJECTED;
3047 spin_lock_irqsave(&cmd->t_state_lock, flags);
3048 if (cmd->transport_state & CMD_T_ABORTED) {
3049 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3052 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3053 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3055 cmd->se_tfo->queue_tm_rsp(cmd);
3058 transport_cmd_check_stop_to_fabric(cmd);
3061 int transport_generic_handle_tmr(
3064 unsigned long flags;
3066 spin_lock_irqsave(&cmd->t_state_lock, flags);
3067 cmd->transport_state |= CMD_T_ACTIVE;
3068 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3070 INIT_WORK(&cmd->work, target_tmr_work);
3071 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3074 EXPORT_SYMBOL(transport_generic_handle_tmr);
3077 target_check_wce(struct se_device *dev)
3081 if (dev->transport->get_write_cache)
3082 wce = dev->transport->get_write_cache(dev);
3083 else if (dev->dev_attrib.emulate_write_cache > 0)
3090 target_check_fua(struct se_device *dev)
3092 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;