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]);
345 spin_lock_irq(&se_nacl->nacl_sess_lock);
347 * The se_nacl->nacl_sess pointer will be set to the
348 * last active I_T Nexus for each struct se_node_acl.
350 se_nacl->nacl_sess = se_sess;
352 list_add_tail(&se_sess->sess_acl_list,
353 &se_nacl->acl_sess_list);
354 spin_unlock_irq(&se_nacl->nacl_sess_lock);
356 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
358 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
359 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
361 EXPORT_SYMBOL(__transport_register_session);
363 void transport_register_session(
364 struct se_portal_group *se_tpg,
365 struct se_node_acl *se_nacl,
366 struct se_session *se_sess,
367 void *fabric_sess_ptr)
371 spin_lock_irqsave(&se_tpg->session_lock, flags);
372 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
373 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
375 EXPORT_SYMBOL(transport_register_session);
377 static void target_release_session(struct kref *kref)
379 struct se_session *se_sess = container_of(kref,
380 struct se_session, sess_kref);
381 struct se_portal_group *se_tpg = se_sess->se_tpg;
383 se_tpg->se_tpg_tfo->close_session(se_sess);
386 int target_get_session(struct se_session *se_sess)
388 return kref_get_unless_zero(&se_sess->sess_kref);
390 EXPORT_SYMBOL(target_get_session);
392 void target_put_session(struct se_session *se_sess)
394 kref_put(&se_sess->sess_kref, target_release_session);
396 EXPORT_SYMBOL(target_put_session);
398 ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
400 struct se_session *se_sess;
403 spin_lock_bh(&se_tpg->session_lock);
404 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
405 if (!se_sess->se_node_acl)
407 if (!se_sess->se_node_acl->dynamic_node_acl)
409 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
412 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
413 se_sess->se_node_acl->initiatorname);
414 len += 1; /* Include NULL terminator */
416 spin_unlock_bh(&se_tpg->session_lock);
420 EXPORT_SYMBOL(target_show_dynamic_sessions);
422 static void target_complete_nacl(struct kref *kref)
424 struct se_node_acl *nacl = container_of(kref,
425 struct se_node_acl, acl_kref);
427 complete(&nacl->acl_free_comp);
430 void target_put_nacl(struct se_node_acl *nacl)
432 kref_put(&nacl->acl_kref, target_complete_nacl);
434 EXPORT_SYMBOL(target_put_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 struct se_node_acl *se_nacl = se_sess->se_node_acl;
469 * Drop the se_node_acl->nacl_kref obtained from within
470 * core_tpg_get_initiator_node_acl().
473 se_sess->se_node_acl = NULL;
474 target_put_nacl(se_nacl);
476 if (se_sess->sess_cmd_map) {
477 percpu_ida_destroy(&se_sess->sess_tag_pool);
478 kvfree(se_sess->sess_cmd_map);
480 kmem_cache_free(se_sess_cache, se_sess);
482 EXPORT_SYMBOL(transport_free_session);
484 void transport_deregister_session(struct se_session *se_sess)
486 struct se_portal_group *se_tpg = se_sess->se_tpg;
487 const struct target_core_fabric_ops *se_tfo;
488 struct se_node_acl *se_nacl;
490 bool drop_nacl = false;
493 transport_free_session(se_sess);
496 se_tfo = se_tpg->se_tpg_tfo;
498 spin_lock_irqsave(&se_tpg->session_lock, flags);
499 list_del(&se_sess->sess_list);
500 se_sess->se_tpg = NULL;
501 se_sess->fabric_sess_ptr = NULL;
502 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
505 * Determine if we need to do extra work for this initiator node's
506 * struct se_node_acl if it had been previously dynamically generated.
508 se_nacl = se_sess->se_node_acl;
510 mutex_lock(&se_tpg->acl_node_mutex);
511 if (se_nacl && se_nacl->dynamic_node_acl) {
512 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
513 list_del(&se_nacl->acl_list);
517 mutex_unlock(&se_tpg->acl_node_mutex);
520 core_tpg_wait_for_nacl_pr_ref(se_nacl);
521 core_free_device_list_for_node(se_nacl, se_tpg);
522 se_sess->se_node_acl = NULL;
525 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
526 se_tpg->se_tpg_tfo->get_fabric_name());
528 * If last kref is dropping now for an explicit NodeACL, awake sleeping
529 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
530 * removal context from within transport_free_session() code.
533 transport_free_session(se_sess);
535 EXPORT_SYMBOL(transport_deregister_session);
537 static void target_remove_from_state_list(struct se_cmd *cmd)
539 struct se_device *dev = cmd->se_dev;
545 if (cmd->transport_state & CMD_T_BUSY)
548 spin_lock_irqsave(&dev->execute_task_lock, flags);
549 if (cmd->state_active) {
550 list_del(&cmd->state_list);
551 cmd->state_active = false;
553 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
556 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
561 if (remove_from_lists) {
562 target_remove_from_state_list(cmd);
565 * Clear struct se_cmd->se_lun before the handoff to FE.
570 spin_lock_irqsave(&cmd->t_state_lock, flags);
572 cmd->t_state = TRANSPORT_WRITE_PENDING;
575 * Determine if frontend context caller is requesting the stopping of
576 * this command for frontend exceptions.
578 if (cmd->transport_state & CMD_T_STOP) {
579 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
580 __func__, __LINE__, cmd->tag);
582 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
584 complete_all(&cmd->t_transport_stop_comp);
588 cmd->transport_state &= ~CMD_T_ACTIVE;
589 if (remove_from_lists) {
591 * Some fabric modules like tcm_loop can release
592 * their internally allocated I/O reference now and
595 * Fabric modules are expected to return '1' here if the
596 * se_cmd being passed is released at this point,
597 * or zero if not being released.
599 if (cmd->se_tfo->check_stop_free != NULL) {
600 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
601 return cmd->se_tfo->check_stop_free(cmd);
605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
609 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
611 return transport_cmd_check_stop(cmd, true, false);
614 static void transport_lun_remove_cmd(struct se_cmd *cmd)
616 struct se_lun *lun = cmd->se_lun;
621 if (cmpxchg(&cmd->lun_ref_active, true, false))
622 percpu_ref_put(&lun->lun_ref);
625 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
627 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
629 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
630 transport_lun_remove_cmd(cmd);
632 * Allow the fabric driver to unmap any resources before
633 * releasing the descriptor via TFO->release_cmd()
636 cmd->se_tfo->aborted_task(cmd);
638 if (transport_cmd_check_stop_to_fabric(cmd))
640 if (remove && ack_kref)
641 transport_put_cmd(cmd);
644 static void target_complete_failure_work(struct work_struct *work)
646 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
648 transport_generic_request_failure(cmd,
649 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
653 * Used when asking transport to copy Sense Data from the underlying
654 * Linux/SCSI struct scsi_cmnd
656 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
658 struct se_device *dev = cmd->se_dev;
660 WARN_ON(!cmd->se_lun);
665 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
668 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
670 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
671 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
672 return cmd->sense_buffer;
675 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
677 struct se_device *dev = cmd->se_dev;
678 int success = scsi_status == GOOD;
681 cmd->scsi_status = scsi_status;
684 spin_lock_irqsave(&cmd->t_state_lock, flags);
685 cmd->transport_state &= ~CMD_T_BUSY;
687 if (dev && dev->transport->transport_complete) {
688 dev->transport->transport_complete(cmd,
690 transport_get_sense_buffer(cmd));
691 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
696 * See if we are waiting to complete for an exception condition.
698 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
699 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
700 complete(&cmd->task_stop_comp);
705 * Check for case where an explicit ABORT_TASK has been received
706 * and transport_wait_for_tasks() will be waiting for completion..
708 if (cmd->transport_state & CMD_T_ABORTED ||
709 cmd->transport_state & CMD_T_STOP) {
710 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
711 complete_all(&cmd->t_transport_stop_comp);
713 } else if (!success) {
714 INIT_WORK(&cmd->work, target_complete_failure_work);
716 INIT_WORK(&cmd->work, target_complete_ok_work);
719 cmd->t_state = TRANSPORT_COMPLETE;
720 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
721 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
723 if (cmd->cpuid == -1)
724 queue_work(target_completion_wq, &cmd->work);
726 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
728 EXPORT_SYMBOL(target_complete_cmd);
730 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
732 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
733 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
734 cmd->residual_count += cmd->data_length - length;
736 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
737 cmd->residual_count = cmd->data_length - length;
740 cmd->data_length = length;
743 target_complete_cmd(cmd, scsi_status);
745 EXPORT_SYMBOL(target_complete_cmd_with_length);
747 static void target_add_to_state_list(struct se_cmd *cmd)
749 struct se_device *dev = cmd->se_dev;
752 spin_lock_irqsave(&dev->execute_task_lock, flags);
753 if (!cmd->state_active) {
754 list_add_tail(&cmd->state_list, &dev->state_list);
755 cmd->state_active = true;
757 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
761 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
763 static void transport_write_pending_qf(struct se_cmd *cmd);
764 static void transport_complete_qf(struct se_cmd *cmd);
766 void target_qf_do_work(struct work_struct *work)
768 struct se_device *dev = container_of(work, struct se_device,
770 LIST_HEAD(qf_cmd_list);
771 struct se_cmd *cmd, *cmd_tmp;
773 spin_lock_irq(&dev->qf_cmd_lock);
774 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
775 spin_unlock_irq(&dev->qf_cmd_lock);
777 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
778 list_del(&cmd->se_qf_node);
779 atomic_dec_mb(&dev->dev_qf_count);
781 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
782 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
783 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
784 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
787 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
788 transport_write_pending_qf(cmd);
789 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
790 transport_complete_qf(cmd);
794 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
796 switch (cmd->data_direction) {
799 case DMA_FROM_DEVICE:
803 case DMA_BIDIRECTIONAL:
812 void transport_dump_dev_state(
813 struct se_device *dev,
817 *bl += sprintf(b + *bl, "Status: ");
818 if (dev->export_count)
819 *bl += sprintf(b + *bl, "ACTIVATED");
821 *bl += sprintf(b + *bl, "DEACTIVATED");
823 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
824 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
825 dev->dev_attrib.block_size,
826 dev->dev_attrib.hw_max_sectors);
827 *bl += sprintf(b + *bl, " ");
830 void transport_dump_vpd_proto_id(
832 unsigned char *p_buf,
835 unsigned char buf[VPD_TMP_BUF_SIZE];
838 memset(buf, 0, VPD_TMP_BUF_SIZE);
839 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
841 switch (vpd->protocol_identifier) {
843 sprintf(buf+len, "Fibre Channel\n");
846 sprintf(buf+len, "Parallel SCSI\n");
849 sprintf(buf+len, "SSA\n");
852 sprintf(buf+len, "IEEE 1394\n");
855 sprintf(buf+len, "SCSI Remote Direct Memory Access"
859 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
862 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
865 sprintf(buf+len, "Automation/Drive Interface Transport"
869 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
872 sprintf(buf+len, "Unknown 0x%02x\n",
873 vpd->protocol_identifier);
878 strncpy(p_buf, buf, p_buf_len);
884 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
887 * Check if the Protocol Identifier Valid (PIV) bit is set..
889 * from spc3r23.pdf section 7.5.1
891 if (page_83[1] & 0x80) {
892 vpd->protocol_identifier = (page_83[0] & 0xf0);
893 vpd->protocol_identifier_set = 1;
894 transport_dump_vpd_proto_id(vpd, NULL, 0);
897 EXPORT_SYMBOL(transport_set_vpd_proto_id);
899 int transport_dump_vpd_assoc(
901 unsigned char *p_buf,
904 unsigned char buf[VPD_TMP_BUF_SIZE];
908 memset(buf, 0, VPD_TMP_BUF_SIZE);
909 len = sprintf(buf, "T10 VPD Identifier Association: ");
911 switch (vpd->association) {
913 sprintf(buf+len, "addressed logical unit\n");
916 sprintf(buf+len, "target port\n");
919 sprintf(buf+len, "SCSI target device\n");
922 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
928 strncpy(p_buf, buf, p_buf_len);
935 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
938 * The VPD identification association..
940 * from spc3r23.pdf Section 7.6.3.1 Table 297
942 vpd->association = (page_83[1] & 0x30);
943 return transport_dump_vpd_assoc(vpd, NULL, 0);
945 EXPORT_SYMBOL(transport_set_vpd_assoc);
947 int transport_dump_vpd_ident_type(
949 unsigned char *p_buf,
952 unsigned char buf[VPD_TMP_BUF_SIZE];
956 memset(buf, 0, VPD_TMP_BUF_SIZE);
957 len = sprintf(buf, "T10 VPD Identifier Type: ");
959 switch (vpd->device_identifier_type) {
961 sprintf(buf+len, "Vendor specific\n");
964 sprintf(buf+len, "T10 Vendor ID based\n");
967 sprintf(buf+len, "EUI-64 based\n");
970 sprintf(buf+len, "NAA\n");
973 sprintf(buf+len, "Relative target port identifier\n");
976 sprintf(buf+len, "SCSI name string\n");
979 sprintf(buf+len, "Unsupported: 0x%02x\n",
980 vpd->device_identifier_type);
986 if (p_buf_len < strlen(buf)+1)
988 strncpy(p_buf, buf, p_buf_len);
996 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
999 * The VPD identifier type..
1001 * from spc3r23.pdf Section 7.6.3.1 Table 298
1003 vpd->device_identifier_type = (page_83[1] & 0x0f);
1004 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1006 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1008 int transport_dump_vpd_ident(
1009 struct t10_vpd *vpd,
1010 unsigned char *p_buf,
1013 unsigned char buf[VPD_TMP_BUF_SIZE];
1016 memset(buf, 0, VPD_TMP_BUF_SIZE);
1018 switch (vpd->device_identifier_code_set) {
1019 case 0x01: /* Binary */
1020 snprintf(buf, sizeof(buf),
1021 "T10 VPD Binary Device Identifier: %s\n",
1022 &vpd->device_identifier[0]);
1024 case 0x02: /* ASCII */
1025 snprintf(buf, sizeof(buf),
1026 "T10 VPD ASCII Device Identifier: %s\n",
1027 &vpd->device_identifier[0]);
1029 case 0x03: /* UTF-8 */
1030 snprintf(buf, sizeof(buf),
1031 "T10 VPD UTF-8 Device Identifier: %s\n",
1032 &vpd->device_identifier[0]);
1035 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1036 " 0x%02x", vpd->device_identifier_code_set);
1042 strncpy(p_buf, buf, p_buf_len);
1044 pr_debug("%s", buf);
1050 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1052 static const char hex_str[] = "0123456789abcdef";
1053 int j = 0, i = 4; /* offset to start of the identifier */
1056 * The VPD Code Set (encoding)
1058 * from spc3r23.pdf Section 7.6.3.1 Table 296
1060 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1061 switch (vpd->device_identifier_code_set) {
1062 case 0x01: /* Binary */
1063 vpd->device_identifier[j++] =
1064 hex_str[vpd->device_identifier_type];
1065 while (i < (4 + page_83[3])) {
1066 vpd->device_identifier[j++] =
1067 hex_str[(page_83[i] & 0xf0) >> 4];
1068 vpd->device_identifier[j++] =
1069 hex_str[page_83[i] & 0x0f];
1073 case 0x02: /* ASCII */
1074 case 0x03: /* UTF-8 */
1075 while (i < (4 + page_83[3]))
1076 vpd->device_identifier[j++] = page_83[i++];
1082 return transport_dump_vpd_ident(vpd, NULL, 0);
1084 EXPORT_SYMBOL(transport_set_vpd_ident);
1086 static sense_reason_t
1087 target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1092 if (!cmd->se_tfo->max_data_sg_nents)
1093 return TCM_NO_SENSE;
1095 * Check if fabric enforced maximum SGL entries per I/O descriptor
1096 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1097 * residual_count and reduce original cmd->data_length to maximum
1098 * length based on single PAGE_SIZE entry scatter-lists.
1100 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1101 if (cmd->data_length > mtl) {
1103 * If an existing CDB overflow is present, calculate new residual
1104 * based on CDB size minus fabric maximum transfer length.
1106 * If an existing CDB underflow is present, calculate new residual
1107 * based on original cmd->data_length minus fabric maximum transfer
1110 * Otherwise, set the underflow residual based on cmd->data_length
1111 * minus fabric maximum transfer length.
1113 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1114 cmd->residual_count = (size - mtl);
1115 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1116 u32 orig_dl = size + cmd->residual_count;
1117 cmd->residual_count = (orig_dl - mtl);
1119 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1120 cmd->residual_count = (cmd->data_length - mtl);
1122 cmd->data_length = mtl;
1124 * Reset sbc_check_prot() calculated protection payload
1125 * length based upon the new smaller MTL.
1127 if (cmd->prot_length) {
1128 u32 sectors = (mtl / dev->dev_attrib.block_size);
1129 cmd->prot_length = dev->prot_length * sectors;
1132 return TCM_NO_SENSE;
1136 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1138 struct se_device *dev = cmd->se_dev;
1140 if (cmd->unknown_data_length) {
1141 cmd->data_length = size;
1142 } else if (size != cmd->data_length) {
1143 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1144 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1145 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1146 cmd->data_length, size, cmd->t_task_cdb[0]);
1148 if (cmd->data_direction == DMA_TO_DEVICE &&
1149 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1150 pr_err("Rejecting underflow/overflow WRITE data\n");
1151 return TCM_INVALID_CDB_FIELD;
1154 * Reject READ_* or WRITE_* with overflow/underflow for
1155 * type SCF_SCSI_DATA_CDB.
1157 if (dev->dev_attrib.block_size != 512) {
1158 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1159 " CDB on non 512-byte sector setup subsystem"
1160 " plugin: %s\n", dev->transport->name);
1161 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1162 return TCM_INVALID_CDB_FIELD;
1165 * For the overflow case keep the existing fabric provided
1166 * ->data_length. Otherwise for the underflow case, reset
1167 * ->data_length to the smaller SCSI expected data transfer
1170 if (size > cmd->data_length) {
1171 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1172 cmd->residual_count = (size - cmd->data_length);
1174 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1175 cmd->residual_count = (cmd->data_length - size);
1176 cmd->data_length = size;
1180 return target_check_max_data_sg_nents(cmd, dev, size);
1185 * Used by fabric modules containing a local struct se_cmd within their
1186 * fabric dependent per I/O descriptor.
1188 * Preserves the value of @cmd->tag.
1190 void transport_init_se_cmd(
1192 const struct target_core_fabric_ops *tfo,
1193 struct se_session *se_sess,
1197 unsigned char *sense_buffer)
1199 INIT_LIST_HEAD(&cmd->se_delayed_node);
1200 INIT_LIST_HEAD(&cmd->se_qf_node);
1201 INIT_LIST_HEAD(&cmd->se_cmd_list);
1202 INIT_LIST_HEAD(&cmd->state_list);
1203 init_completion(&cmd->t_transport_stop_comp);
1204 init_completion(&cmd->cmd_wait_comp);
1205 init_completion(&cmd->task_stop_comp);
1206 spin_lock_init(&cmd->t_state_lock);
1207 kref_init(&cmd->cmd_kref);
1208 cmd->transport_state = CMD_T_DEV_ACTIVE;
1211 cmd->se_sess = se_sess;
1212 cmd->data_length = data_length;
1213 cmd->data_direction = data_direction;
1214 cmd->sam_task_attr = task_attr;
1215 cmd->sense_buffer = sense_buffer;
1217 cmd->state_active = false;
1219 EXPORT_SYMBOL(transport_init_se_cmd);
1221 static sense_reason_t
1222 transport_check_alloc_task_attr(struct se_cmd *cmd)
1224 struct se_device *dev = cmd->se_dev;
1227 * Check if SAM Task Attribute emulation is enabled for this
1228 * struct se_device storage object
1230 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1233 if (cmd->sam_task_attr == TCM_ACA_TAG) {
1234 pr_debug("SAM Task Attribute ACA"
1235 " emulation is not supported\n");
1236 return TCM_INVALID_CDB_FIELD;
1243 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1245 struct se_device *dev = cmd->se_dev;
1249 * Ensure that the received CDB is less than the max (252 + 8) bytes
1250 * for VARIABLE_LENGTH_CMD
1252 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1253 pr_err("Received SCSI CDB with command_size: %d that"
1254 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1255 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1256 return TCM_INVALID_CDB_FIELD;
1259 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1260 * allocate the additional extended CDB buffer now.. Otherwise
1261 * setup the pointer from __t_task_cdb to t_task_cdb.
1263 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1264 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1266 if (!cmd->t_task_cdb) {
1267 pr_err("Unable to allocate cmd->t_task_cdb"
1268 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1269 scsi_command_size(cdb),
1270 (unsigned long)sizeof(cmd->__t_task_cdb));
1271 return TCM_OUT_OF_RESOURCES;
1274 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1276 * Copy the original CDB into cmd->
1278 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1280 trace_target_sequencer_start(cmd);
1283 * Check for an existing UNIT ATTENTION condition
1285 ret = target_scsi3_ua_check(cmd);
1289 ret = target_alua_state_check(cmd);
1293 ret = target_check_reservation(cmd);
1295 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1299 ret = dev->transport->parse_cdb(cmd);
1300 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1301 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1302 cmd->se_tfo->get_fabric_name(),
1303 cmd->se_sess->se_node_acl->initiatorname,
1304 cmd->t_task_cdb[0]);
1308 ret = transport_check_alloc_task_attr(cmd);
1312 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1313 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
1316 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1319 * Used by fabric module frontends to queue tasks directly.
1320 * May only be used from process context.
1322 int transport_handle_cdb_direct(
1329 pr_err("cmd->se_lun is NULL\n");
1332 if (in_interrupt()) {
1334 pr_err("transport_generic_handle_cdb cannot be called"
1335 " from interrupt context\n");
1339 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1340 * outstanding descriptors are handled correctly during shutdown via
1341 * transport_wait_for_tasks()
1343 * Also, we don't take cmd->t_state_lock here as we only expect
1344 * this to be called for initial descriptor submission.
1346 cmd->t_state = TRANSPORT_NEW_CMD;
1347 cmd->transport_state |= CMD_T_ACTIVE;
1350 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1351 * so follow TRANSPORT_NEW_CMD processing thread context usage
1352 * and call transport_generic_request_failure() if necessary..
1354 ret = transport_generic_new_cmd(cmd);
1356 transport_generic_request_failure(cmd, ret);
1359 EXPORT_SYMBOL(transport_handle_cdb_direct);
1362 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1363 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1365 if (!sgl || !sgl_count)
1369 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1370 * scatterlists already have been set to follow what the fabric
1371 * passes for the original expected data transfer length.
1373 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1374 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1375 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1376 return TCM_INVALID_CDB_FIELD;
1379 cmd->t_data_sg = sgl;
1380 cmd->t_data_nents = sgl_count;
1381 cmd->t_bidi_data_sg = sgl_bidi;
1382 cmd->t_bidi_data_nents = sgl_bidi_count;
1384 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1389 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1390 * se_cmd + use pre-allocated SGL memory.
1392 * @se_cmd: command descriptor to submit
1393 * @se_sess: associated se_sess for endpoint
1394 * @cdb: pointer to SCSI CDB
1395 * @sense: pointer to SCSI sense buffer
1396 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1397 * @data_length: fabric expected data transfer length
1398 * @task_addr: SAM task attribute
1399 * @data_dir: DMA data direction
1400 * @flags: flags for command submission from target_sc_flags_tables
1401 * @sgl: struct scatterlist memory for unidirectional mapping
1402 * @sgl_count: scatterlist count for unidirectional mapping
1403 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1404 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1405 * @sgl_prot: struct scatterlist memory protection information
1406 * @sgl_prot_count: scatterlist count for protection information
1408 * Task tags are supported if the caller has set @se_cmd->tag.
1410 * Returns non zero to signal active I/O shutdown failure. All other
1411 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1412 * but still return zero here.
1414 * This may only be called from process context, and also currently
1415 * assumes internal allocation of fabric payload buffer by target-core.
1417 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1418 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1419 u32 data_length, int task_attr, int data_dir, int flags,
1420 struct scatterlist *sgl, u32 sgl_count,
1421 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1422 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1424 struct se_portal_group *se_tpg;
1428 se_tpg = se_sess->se_tpg;
1430 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1431 BUG_ON(in_interrupt());
1433 * Initialize se_cmd for target operation. From this point
1434 * exceptions are handled by sending exception status via
1435 * target_core_fabric_ops->queue_status() callback
1437 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1438 data_length, data_dir, task_attr, sense);
1439 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1440 se_cmd->unknown_data_length = 1;
1442 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1443 * se_sess->sess_cmd_list. A second kref_get here is necessary
1444 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1445 * kref_put() to happen during fabric packet acknowledgement.
1447 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1451 * Signal bidirectional data payloads to target-core
1453 if (flags & TARGET_SCF_BIDI_OP)
1454 se_cmd->se_cmd_flags |= SCF_BIDI;
1456 * Locate se_lun pointer and attach it to struct se_cmd
1458 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1460 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1461 target_put_sess_cmd(se_cmd);
1465 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1467 transport_generic_request_failure(se_cmd, rc);
1472 * Save pointers for SGLs containing protection information,
1475 if (sgl_prot_count) {
1476 se_cmd->t_prot_sg = sgl_prot;
1477 se_cmd->t_prot_nents = sgl_prot_count;
1478 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
1482 * When a non zero sgl_count has been passed perform SGL passthrough
1483 * mapping for pre-allocated fabric memory instead of having target
1484 * core perform an internal SGL allocation..
1486 if (sgl_count != 0) {
1490 * A work-around for tcm_loop as some userspace code via
1491 * scsi-generic do not memset their associated read buffers,
1492 * so go ahead and do that here for type non-data CDBs. Also
1493 * note that this is currently guaranteed to be a single SGL
1494 * for this case by target core in target_setup_cmd_from_cdb()
1495 * -> transport_generic_cmd_sequencer().
1497 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1498 se_cmd->data_direction == DMA_FROM_DEVICE) {
1499 unsigned char *buf = NULL;
1502 buf = kmap(sg_page(sgl)) + sgl->offset;
1505 memset(buf, 0, sgl->length);
1506 kunmap(sg_page(sgl));
1510 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1511 sgl_bidi, sgl_bidi_count);
1513 transport_generic_request_failure(se_cmd, rc);
1519 * Check if we need to delay processing because of ALUA
1520 * Active/NonOptimized primary access state..
1522 core_alua_check_nonop_delay(se_cmd);
1524 transport_handle_cdb_direct(se_cmd);
1527 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1530 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1532 * @se_cmd: command descriptor to submit
1533 * @se_sess: associated se_sess for endpoint
1534 * @cdb: pointer to SCSI CDB
1535 * @sense: pointer to SCSI sense buffer
1536 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1537 * @data_length: fabric expected data transfer length
1538 * @task_addr: SAM task attribute
1539 * @data_dir: DMA data direction
1540 * @flags: flags for command submission from target_sc_flags_tables
1542 * Task tags are supported if the caller has set @se_cmd->tag.
1544 * Returns non zero to signal active I/O shutdown failure. All other
1545 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1546 * but still return zero here.
1548 * This may only be called from process context, and also currently
1549 * assumes internal allocation of fabric payload buffer by target-core.
1551 * It also assumes interal target core SGL memory allocation.
1553 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1554 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1555 u32 data_length, int task_attr, int data_dir, int flags)
1557 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1558 unpacked_lun, data_length, task_attr, data_dir,
1559 flags, NULL, 0, NULL, 0, NULL, 0);
1561 EXPORT_SYMBOL(target_submit_cmd);
1563 static void target_complete_tmr_failure(struct work_struct *work)
1565 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1567 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1568 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1570 transport_cmd_check_stop_to_fabric(se_cmd);
1574 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1577 * @se_cmd: command descriptor to submit
1578 * @se_sess: associated se_sess for endpoint
1579 * @sense: pointer to SCSI sense buffer
1580 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1581 * @fabric_context: fabric context for TMR req
1582 * @tm_type: Type of TM request
1583 * @gfp: gfp type for caller
1584 * @tag: referenced task tag for TMR_ABORT_TASK
1585 * @flags: submit cmd flags
1587 * Callable from all contexts.
1590 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1591 unsigned char *sense, u64 unpacked_lun,
1592 void *fabric_tmr_ptr, unsigned char tm_type,
1593 gfp_t gfp, u64 tag, int flags)
1595 struct se_portal_group *se_tpg;
1598 se_tpg = se_sess->se_tpg;
1601 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1602 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
1604 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1605 * allocation failure.
1607 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1611 if (tm_type == TMR_ABORT_TASK)
1612 se_cmd->se_tmr_req->ref_task_tag = tag;
1614 /* See target_submit_cmd for commentary */
1615 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1617 core_tmr_release_req(se_cmd->se_tmr_req);
1621 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1624 * For callback during failure handling, push this work off
1625 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1627 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1628 schedule_work(&se_cmd->work);
1631 transport_generic_handle_tmr(se_cmd);
1634 EXPORT_SYMBOL(target_submit_tmr);
1637 * If the cmd is active, request it to be stopped and sleep until it
1640 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1641 __releases(&cmd->t_state_lock)
1642 __acquires(&cmd->t_state_lock)
1644 bool was_active = false;
1646 if (cmd->transport_state & CMD_T_BUSY) {
1647 cmd->transport_state |= CMD_T_REQUEST_STOP;
1648 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1650 pr_debug("cmd %p waiting to complete\n", cmd);
1651 wait_for_completion(&cmd->task_stop_comp);
1652 pr_debug("cmd %p stopped successfully\n", cmd);
1654 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1655 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1656 cmd->transport_state &= ~CMD_T_BUSY;
1664 * Handle SAM-esque emulation for generic transport request failures.
1666 void transport_generic_request_failure(struct se_cmd *cmd,
1667 sense_reason_t sense_reason)
1669 int ret = 0, post_ret = 0;
1671 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1672 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
1673 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1674 cmd->se_tfo->get_cmd_state(cmd),
1675 cmd->t_state, sense_reason);
1676 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1677 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1678 (cmd->transport_state & CMD_T_STOP) != 0,
1679 (cmd->transport_state & CMD_T_SENT) != 0);
1682 * For SAM Task Attribute emulation for failed struct se_cmd
1684 transport_complete_task_attr(cmd);
1686 * Handle special case for COMPARE_AND_WRITE failure, where the
1687 * callback is expected to drop the per device ->caw_sem.
1689 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1690 cmd->transport_complete_callback)
1691 cmd->transport_complete_callback(cmd, false, &post_ret);
1693 switch (sense_reason) {
1694 case TCM_NON_EXISTENT_LUN:
1695 case TCM_UNSUPPORTED_SCSI_OPCODE:
1696 case TCM_INVALID_CDB_FIELD:
1697 case TCM_INVALID_PARAMETER_LIST:
1698 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1699 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1700 case TCM_UNKNOWN_MODE_PAGE:
1701 case TCM_WRITE_PROTECTED:
1702 case TCM_ADDRESS_OUT_OF_RANGE:
1703 case TCM_CHECK_CONDITION_ABORT_CMD:
1704 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1705 case TCM_CHECK_CONDITION_NOT_READY:
1706 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1707 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1708 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1710 case TCM_OUT_OF_RESOURCES:
1711 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1713 case TCM_RESERVATION_CONFLICT:
1715 * No SENSE Data payload for this case, set SCSI Status
1716 * and queue the response to $FABRIC_MOD.
1718 * Uses linux/include/scsi/scsi.h SAM status codes defs
1720 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1722 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1723 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1726 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1729 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1730 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1731 cmd->orig_fe_lun, 0x2C,
1732 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1734 trace_target_cmd_complete(cmd);
1735 ret = cmd->se_tfo->queue_status(cmd);
1736 if (ret == -EAGAIN || ret == -ENOMEM)
1740 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1741 cmd->t_task_cdb[0], sense_reason);
1742 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1746 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1747 if (ret == -EAGAIN || ret == -ENOMEM)
1751 transport_lun_remove_cmd(cmd);
1752 transport_cmd_check_stop_to_fabric(cmd);
1756 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1757 transport_handle_queue_full(cmd, cmd->se_dev);
1759 EXPORT_SYMBOL(transport_generic_request_failure);
1761 void __target_execute_cmd(struct se_cmd *cmd)
1765 if (cmd->execute_cmd) {
1766 ret = cmd->execute_cmd(cmd);
1768 spin_lock_irq(&cmd->t_state_lock);
1769 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1770 spin_unlock_irq(&cmd->t_state_lock);
1772 transport_generic_request_failure(cmd, ret);
1777 static int target_write_prot_action(struct se_cmd *cmd)
1781 * Perform WRITE_INSERT of PI using software emulation when backend
1782 * device has PI enabled, if the transport has not already generated
1783 * PI using hardware WRITE_INSERT offload.
1785 switch (cmd->prot_op) {
1786 case TARGET_PROT_DOUT_INSERT:
1787 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1788 sbc_dif_generate(cmd);
1790 case TARGET_PROT_DOUT_STRIP:
1791 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1794 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
1795 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1796 sectors, 0, cmd->t_prot_sg, 0);
1797 if (unlikely(cmd->pi_err)) {
1798 spin_lock_irq(&cmd->t_state_lock);
1799 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1800 spin_unlock_irq(&cmd->t_state_lock);
1801 transport_generic_request_failure(cmd, cmd->pi_err);
1812 static bool target_handle_task_attr(struct se_cmd *cmd)
1814 struct se_device *dev = cmd->se_dev;
1816 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1820 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1821 * to allow the passed struct se_cmd list of tasks to the front of the list.
1823 switch (cmd->sam_task_attr) {
1825 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1826 cmd->t_task_cdb[0]);
1828 case TCM_ORDERED_TAG:
1829 atomic_inc_mb(&dev->dev_ordered_sync);
1831 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1832 cmd->t_task_cdb[0]);
1835 * Execute an ORDERED command if no other older commands
1836 * exist that need to be completed first.
1838 if (!atomic_read(&dev->simple_cmds))
1843 * For SIMPLE and UNTAGGED Task Attribute commands
1845 atomic_inc_mb(&dev->simple_cmds);
1849 if (atomic_read(&dev->dev_ordered_sync) == 0)
1852 spin_lock(&dev->delayed_cmd_lock);
1853 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1854 spin_unlock(&dev->delayed_cmd_lock);
1856 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1857 cmd->t_task_cdb[0], cmd->sam_task_attr);
1861 void target_execute_cmd(struct se_cmd *cmd)
1864 * If the received CDB has aleady been aborted stop processing it here.
1866 if (transport_check_aborted_status(cmd, 1))
1870 * Determine if frontend context caller is requesting the stopping of
1871 * this command for frontend exceptions.
1873 spin_lock_irq(&cmd->t_state_lock);
1874 if (cmd->transport_state & CMD_T_STOP) {
1875 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1876 __func__, __LINE__, cmd->tag);
1878 spin_unlock_irq(&cmd->t_state_lock);
1879 complete_all(&cmd->t_transport_stop_comp);
1883 cmd->t_state = TRANSPORT_PROCESSING;
1884 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1885 spin_unlock_irq(&cmd->t_state_lock);
1887 if (target_write_prot_action(cmd))
1890 if (target_handle_task_attr(cmd)) {
1891 spin_lock_irq(&cmd->t_state_lock);
1892 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1893 spin_unlock_irq(&cmd->t_state_lock);
1897 __target_execute_cmd(cmd);
1899 EXPORT_SYMBOL(target_execute_cmd);
1902 * Process all commands up to the last received ORDERED task attribute which
1903 * requires another blocking boundary
1905 static void target_restart_delayed_cmds(struct se_device *dev)
1910 spin_lock(&dev->delayed_cmd_lock);
1911 if (list_empty(&dev->delayed_cmd_list)) {
1912 spin_unlock(&dev->delayed_cmd_lock);
1916 cmd = list_entry(dev->delayed_cmd_list.next,
1917 struct se_cmd, se_delayed_node);
1918 list_del(&cmd->se_delayed_node);
1919 spin_unlock(&dev->delayed_cmd_lock);
1921 __target_execute_cmd(cmd);
1923 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
1929 * Called from I/O completion to determine which dormant/delayed
1930 * and ordered cmds need to have their tasks added to the execution queue.
1932 static void transport_complete_task_attr(struct se_cmd *cmd)
1934 struct se_device *dev = cmd->se_dev;
1936 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1939 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
1940 atomic_dec_mb(&dev->simple_cmds);
1941 dev->dev_cur_ordered_id++;
1942 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1943 dev->dev_cur_ordered_id);
1944 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
1945 dev->dev_cur_ordered_id++;
1946 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1947 dev->dev_cur_ordered_id);
1948 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
1949 atomic_dec_mb(&dev->dev_ordered_sync);
1951 dev->dev_cur_ordered_id++;
1952 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1953 dev->dev_cur_ordered_id);
1956 target_restart_delayed_cmds(dev);
1959 static void transport_complete_qf(struct se_cmd *cmd)
1963 transport_complete_task_attr(cmd);
1965 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1966 trace_target_cmd_complete(cmd);
1967 ret = cmd->se_tfo->queue_status(cmd);
1971 switch (cmd->data_direction) {
1972 case DMA_FROM_DEVICE:
1973 trace_target_cmd_complete(cmd);
1974 ret = cmd->se_tfo->queue_data_in(cmd);
1977 if (cmd->se_cmd_flags & SCF_BIDI) {
1978 ret = cmd->se_tfo->queue_data_in(cmd);
1981 /* Fall through for DMA_TO_DEVICE */
1983 trace_target_cmd_complete(cmd);
1984 ret = cmd->se_tfo->queue_status(cmd);
1992 transport_handle_queue_full(cmd, cmd->se_dev);
1995 transport_lun_remove_cmd(cmd);
1996 transport_cmd_check_stop_to_fabric(cmd);
1999 static void transport_handle_queue_full(
2001 struct se_device *dev)
2003 spin_lock_irq(&dev->qf_cmd_lock);
2004 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2005 atomic_inc_mb(&dev->dev_qf_count);
2006 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2008 schedule_work(&cmd->se_dev->qf_work_queue);
2011 static bool target_read_prot_action(struct se_cmd *cmd)
2013 switch (cmd->prot_op) {
2014 case TARGET_PROT_DIN_STRIP:
2015 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
2016 u32 sectors = cmd->data_length >>
2017 ilog2(cmd->se_dev->dev_attrib.block_size);
2019 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2020 sectors, 0, cmd->t_prot_sg,
2026 case TARGET_PROT_DIN_INSERT:
2027 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2030 sbc_dif_generate(cmd);
2039 static void target_complete_ok_work(struct work_struct *work)
2041 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2045 * Check if we need to move delayed/dormant tasks from cmds on the
2046 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2049 transport_complete_task_attr(cmd);
2052 * Check to schedule QUEUE_FULL work, or execute an existing
2053 * cmd->transport_qf_callback()
2055 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2056 schedule_work(&cmd->se_dev->qf_work_queue);
2059 * Check if we need to send a sense buffer from
2060 * the struct se_cmd in question.
2062 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2063 WARN_ON(!cmd->scsi_status);
2064 ret = transport_send_check_condition_and_sense(
2066 if (ret == -EAGAIN || ret == -ENOMEM)
2069 transport_lun_remove_cmd(cmd);
2070 transport_cmd_check_stop_to_fabric(cmd);
2074 * Check for a callback, used by amongst other things
2075 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
2077 if (cmd->transport_complete_callback) {
2079 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2080 bool zero_dl = !(cmd->data_length);
2083 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2084 if (!rc && !post_ret) {
2090 ret = transport_send_check_condition_and_sense(cmd,
2092 if (ret == -EAGAIN || ret == -ENOMEM)
2095 transport_lun_remove_cmd(cmd);
2096 transport_cmd_check_stop_to_fabric(cmd);
2102 switch (cmd->data_direction) {
2103 case DMA_FROM_DEVICE:
2104 atomic_long_add(cmd->data_length,
2105 &cmd->se_lun->lun_stats.tx_data_octets);
2107 * Perform READ_STRIP of PI using software emulation when
2108 * backend had PI enabled, if the transport will not be
2109 * performing hardware READ_STRIP offload.
2111 if (target_read_prot_action(cmd)) {
2112 ret = transport_send_check_condition_and_sense(cmd,
2114 if (ret == -EAGAIN || ret == -ENOMEM)
2117 transport_lun_remove_cmd(cmd);
2118 transport_cmd_check_stop_to_fabric(cmd);
2122 trace_target_cmd_complete(cmd);
2123 ret = cmd->se_tfo->queue_data_in(cmd);
2124 if (ret == -EAGAIN || ret == -ENOMEM)
2128 atomic_long_add(cmd->data_length,
2129 &cmd->se_lun->lun_stats.rx_data_octets);
2131 * Check if we need to send READ payload for BIDI-COMMAND
2133 if (cmd->se_cmd_flags & SCF_BIDI) {
2134 atomic_long_add(cmd->data_length,
2135 &cmd->se_lun->lun_stats.tx_data_octets);
2136 ret = cmd->se_tfo->queue_data_in(cmd);
2137 if (ret == -EAGAIN || ret == -ENOMEM)
2141 /* Fall through for DMA_TO_DEVICE */
2143 trace_target_cmd_complete(cmd);
2144 ret = cmd->se_tfo->queue_status(cmd);
2145 if (ret == -EAGAIN || ret == -ENOMEM)
2152 transport_lun_remove_cmd(cmd);
2153 transport_cmd_check_stop_to_fabric(cmd);
2157 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2158 " data_direction: %d\n", cmd, cmd->data_direction);
2159 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2160 transport_handle_queue_full(cmd, cmd->se_dev);
2163 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2165 struct scatterlist *sg;
2168 for_each_sg(sgl, sg, nents, count)
2169 __free_page(sg_page(sg));
2174 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2177 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2178 * emulation, and free + reset pointers if necessary..
2180 if (!cmd->t_data_sg_orig)
2183 kfree(cmd->t_data_sg);
2184 cmd->t_data_sg = cmd->t_data_sg_orig;
2185 cmd->t_data_sg_orig = NULL;
2186 cmd->t_data_nents = cmd->t_data_nents_orig;
2187 cmd->t_data_nents_orig = 0;
2190 static inline void transport_free_pages(struct se_cmd *cmd)
2192 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2193 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2194 cmd->t_prot_sg = NULL;
2195 cmd->t_prot_nents = 0;
2198 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2200 * Release special case READ buffer payload required for
2201 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2203 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2204 transport_free_sgl(cmd->t_bidi_data_sg,
2205 cmd->t_bidi_data_nents);
2206 cmd->t_bidi_data_sg = NULL;
2207 cmd->t_bidi_data_nents = 0;
2209 transport_reset_sgl_orig(cmd);
2212 transport_reset_sgl_orig(cmd);
2214 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2215 cmd->t_data_sg = NULL;
2216 cmd->t_data_nents = 0;
2218 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2219 cmd->t_bidi_data_sg = NULL;
2220 cmd->t_bidi_data_nents = 0;
2224 * transport_put_cmd - release a reference to a command
2225 * @cmd: command to release
2227 * This routine releases our reference to the command and frees it if possible.
2229 static int transport_put_cmd(struct se_cmd *cmd)
2231 BUG_ON(!cmd->se_tfo);
2233 * If this cmd has been setup with target_get_sess_cmd(), drop
2234 * the kref and call ->release_cmd() in kref callback.
2236 return target_put_sess_cmd(cmd);
2239 void *transport_kmap_data_sg(struct se_cmd *cmd)
2241 struct scatterlist *sg = cmd->t_data_sg;
2242 struct page **pages;
2246 * We need to take into account a possible offset here for fabrics like
2247 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2248 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2250 if (!cmd->t_data_nents)
2254 if (cmd->t_data_nents == 1)
2255 return kmap(sg_page(sg)) + sg->offset;
2257 /* >1 page. use vmap */
2258 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2262 /* convert sg[] to pages[] */
2263 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2264 pages[i] = sg_page(sg);
2267 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2269 if (!cmd->t_data_vmap)
2272 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2274 EXPORT_SYMBOL(transport_kmap_data_sg);
2276 void transport_kunmap_data_sg(struct se_cmd *cmd)
2278 if (!cmd->t_data_nents) {
2280 } else if (cmd->t_data_nents == 1) {
2281 kunmap(sg_page(cmd->t_data_sg));
2285 vunmap(cmd->t_data_vmap);
2286 cmd->t_data_vmap = NULL;
2288 EXPORT_SYMBOL(transport_kunmap_data_sg);
2291 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2294 struct scatterlist *sg;
2296 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2300 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2301 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2305 sg_init_table(sg, nent);
2308 u32 page_len = min_t(u32, length, PAGE_SIZE);
2309 page = alloc_page(GFP_KERNEL | zero_flag);
2313 sg_set_page(&sg[i], page, page_len, 0);
2324 __free_page(sg_page(&sg[i]));
2331 * Allocate any required resources to execute the command. For writes we
2332 * might not have the payload yet, so notify the fabric via a call to
2333 * ->write_pending instead. Otherwise place it on the execution queue.
2336 transport_generic_new_cmd(struct se_cmd *cmd)
2339 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2341 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2342 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2343 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2344 cmd->prot_length, true);
2346 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2350 * Determine is the TCM fabric module has already allocated physical
2351 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2354 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2357 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2358 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2361 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2362 bidi_length = cmd->t_task_nolb *
2363 cmd->se_dev->dev_attrib.block_size;
2365 bidi_length = cmd->data_length;
2367 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2368 &cmd->t_bidi_data_nents,
2369 bidi_length, zero_flag);
2371 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2374 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2375 cmd->data_length, zero_flag);
2377 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2378 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2381 * Special case for COMPARE_AND_WRITE with fabrics
2382 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2384 u32 caw_length = cmd->t_task_nolb *
2385 cmd->se_dev->dev_attrib.block_size;
2387 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2388 &cmd->t_bidi_data_nents,
2389 caw_length, zero_flag);
2391 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2394 * If this command is not a write we can execute it right here,
2395 * for write buffers we need to notify the fabric driver first
2396 * and let it call back once the write buffers are ready.
2398 target_add_to_state_list(cmd);
2399 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
2400 target_execute_cmd(cmd);
2403 transport_cmd_check_stop(cmd, false, true);
2405 ret = cmd->se_tfo->write_pending(cmd);
2406 if (ret == -EAGAIN || ret == -ENOMEM)
2409 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2412 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2415 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2416 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2417 transport_handle_queue_full(cmd, cmd->se_dev);
2420 EXPORT_SYMBOL(transport_generic_new_cmd);
2422 static void transport_write_pending_qf(struct se_cmd *cmd)
2426 ret = cmd->se_tfo->write_pending(cmd);
2427 if (ret == -EAGAIN || ret == -ENOMEM) {
2428 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2430 transport_handle_queue_full(cmd, cmd->se_dev);
2435 __transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2436 unsigned long *flags);
2438 static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2440 unsigned long flags;
2442 spin_lock_irqsave(&cmd->t_state_lock, flags);
2443 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2444 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2447 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2450 bool aborted = false, tas = false;
2452 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2453 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2454 target_wait_free_cmd(cmd, &aborted, &tas);
2456 if (!aborted || tas)
2457 ret = transport_put_cmd(cmd);
2460 target_wait_free_cmd(cmd, &aborted, &tas);
2462 * Handle WRITE failure case where transport_generic_new_cmd()
2463 * has already added se_cmd to state_list, but fabric has
2464 * failed command before I/O submission.
2466 if (cmd->state_active)
2467 target_remove_from_state_list(cmd);
2470 transport_lun_remove_cmd(cmd);
2472 if (!aborted || tas)
2473 ret = transport_put_cmd(cmd);
2476 * If the task has been internally aborted due to TMR ABORT_TASK
2477 * or LUN_RESET, target_core_tmr.c is responsible for performing
2478 * the remaining calls to target_put_sess_cmd(), and not the
2479 * callers of this function.
2482 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2483 wait_for_completion(&cmd->cmd_wait_comp);
2484 cmd->se_tfo->release_cmd(cmd);
2489 EXPORT_SYMBOL(transport_generic_free_cmd);
2491 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2492 * @se_cmd: command descriptor to add
2493 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2495 int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
2497 struct se_session *se_sess = se_cmd->se_sess;
2498 unsigned long flags;
2502 * Add a second kref if the fabric caller is expecting to handle
2503 * fabric acknowledgement that requires two target_put_sess_cmd()
2504 * invocations before se_cmd descriptor release.
2507 kref_get(&se_cmd->cmd_kref);
2509 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2510 if (se_sess->sess_tearing_down) {
2514 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2516 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2518 if (ret && ack_kref)
2519 target_put_sess_cmd(se_cmd);
2523 EXPORT_SYMBOL(target_get_sess_cmd);
2525 static void target_free_cmd_mem(struct se_cmd *cmd)
2527 transport_free_pages(cmd);
2529 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2530 core_tmr_release_req(cmd->se_tmr_req);
2531 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2532 kfree(cmd->t_task_cdb);
2535 static void target_release_cmd_kref(struct kref *kref)
2537 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2538 struct se_session *se_sess = se_cmd->se_sess;
2539 unsigned long flags;
2542 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2543 if (list_empty(&se_cmd->se_cmd_list)) {
2544 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2545 target_free_cmd_mem(se_cmd);
2546 se_cmd->se_tfo->release_cmd(se_cmd);
2550 spin_lock(&se_cmd->t_state_lock);
2551 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP);
2552 spin_unlock(&se_cmd->t_state_lock);
2554 if (se_cmd->cmd_wait_set || fabric_stop) {
2555 list_del_init(&se_cmd->se_cmd_list);
2556 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2557 target_free_cmd_mem(se_cmd);
2558 complete(&se_cmd->cmd_wait_comp);
2561 list_del_init(&se_cmd->se_cmd_list);
2562 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2564 target_free_cmd_mem(se_cmd);
2565 se_cmd->se_tfo->release_cmd(se_cmd);
2568 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2569 * @se_cmd: command descriptor to drop
2571 int target_put_sess_cmd(struct se_cmd *se_cmd)
2573 struct se_session *se_sess = se_cmd->se_sess;
2576 target_free_cmd_mem(se_cmd);
2577 se_cmd->se_tfo->release_cmd(se_cmd);
2580 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2582 EXPORT_SYMBOL(target_put_sess_cmd);
2584 /* target_sess_cmd_list_set_waiting - Flag all commands in
2585 * sess_cmd_list to complete cmd_wait_comp. Set
2586 * sess_tearing_down so no more commands are queued.
2587 * @se_sess: session to flag
2589 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2591 struct se_cmd *se_cmd;
2592 unsigned long flags;
2595 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2596 if (se_sess->sess_tearing_down) {
2597 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2600 se_sess->sess_tearing_down = 1;
2601 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2603 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) {
2604 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2606 se_cmd->cmd_wait_set = 1;
2607 spin_lock(&se_cmd->t_state_lock);
2608 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2609 spin_unlock(&se_cmd->t_state_lock);
2613 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2615 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2617 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2618 * @se_sess: session to wait for active I/O
2620 void target_wait_for_sess_cmds(struct se_session *se_sess)
2622 struct se_cmd *se_cmd, *tmp_cmd;
2623 unsigned long flags;
2626 list_for_each_entry_safe(se_cmd, tmp_cmd,
2627 &se_sess->sess_wait_list, se_cmd_list) {
2628 list_del_init(&se_cmd->se_cmd_list);
2630 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2631 " %d\n", se_cmd, se_cmd->t_state,
2632 se_cmd->se_tfo->get_cmd_state(se_cmd));
2634 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2635 tas = (se_cmd->transport_state & CMD_T_TAS);
2636 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2638 if (!target_put_sess_cmd(se_cmd)) {
2640 target_put_sess_cmd(se_cmd);
2643 wait_for_completion(&se_cmd->cmd_wait_comp);
2644 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2645 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2646 se_cmd->se_tfo->get_cmd_state(se_cmd));
2648 se_cmd->se_tfo->release_cmd(se_cmd);
2651 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2652 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2653 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2656 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2658 void transport_clear_lun_ref(struct se_lun *lun)
2660 percpu_ref_kill(&lun->lun_ref);
2661 wait_for_completion(&lun->lun_ref_comp);
2665 __transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2666 bool *aborted, bool *tas, unsigned long *flags)
2667 __releases(&cmd->t_state_lock)
2668 __acquires(&cmd->t_state_lock)
2671 assert_spin_locked(&cmd->t_state_lock);
2672 WARN_ON_ONCE(!irqs_disabled());
2675 cmd->transport_state |= CMD_T_FABRIC_STOP;
2677 if (cmd->transport_state & CMD_T_ABORTED)
2680 if (cmd->transport_state & CMD_T_TAS)
2683 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2684 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2687 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2688 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2691 if (!(cmd->transport_state & CMD_T_ACTIVE))
2694 if (fabric_stop && *aborted)
2697 cmd->transport_state |= CMD_T_STOP;
2699 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2700 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2701 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2703 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
2705 wait_for_completion(&cmd->t_transport_stop_comp);
2707 spin_lock_irqsave(&cmd->t_state_lock, *flags);
2708 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2710 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2711 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
2717 * transport_wait_for_tasks - wait for completion to occur
2718 * @cmd: command to wait
2720 * Called from frontend fabric context to wait for storage engine
2721 * to pause and/or release frontend generated struct se_cmd.
2723 bool transport_wait_for_tasks(struct se_cmd *cmd)
2725 unsigned long flags;
2726 bool ret, aborted = false, tas = false;
2728 spin_lock_irqsave(&cmd->t_state_lock, flags);
2729 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
2730 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2734 EXPORT_SYMBOL(transport_wait_for_tasks);
2740 bool add_sector_info;
2743 static const struct sense_info sense_info_table[] = {
2747 [TCM_NON_EXISTENT_LUN] = {
2748 .key = ILLEGAL_REQUEST,
2749 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2751 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2752 .key = ILLEGAL_REQUEST,
2753 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2755 [TCM_SECTOR_COUNT_TOO_MANY] = {
2756 .key = ILLEGAL_REQUEST,
2757 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2759 [TCM_UNKNOWN_MODE_PAGE] = {
2760 .key = ILLEGAL_REQUEST,
2761 .asc = 0x24, /* INVALID FIELD IN CDB */
2763 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2764 .key = ABORTED_COMMAND,
2765 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2768 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2769 .key = ABORTED_COMMAND,
2770 .asc = 0x0c, /* WRITE ERROR */
2771 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2773 [TCM_INVALID_CDB_FIELD] = {
2774 .key = ILLEGAL_REQUEST,
2775 .asc = 0x24, /* INVALID FIELD IN CDB */
2777 [TCM_INVALID_PARAMETER_LIST] = {
2778 .key = ILLEGAL_REQUEST,
2779 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2781 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2782 .key = ILLEGAL_REQUEST,
2783 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2785 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2786 .key = ILLEGAL_REQUEST,
2787 .asc = 0x0c, /* WRITE ERROR */
2788 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2790 [TCM_SERVICE_CRC_ERROR] = {
2791 .key = ABORTED_COMMAND,
2792 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2793 .ascq = 0x05, /* N/A */
2795 [TCM_SNACK_REJECTED] = {
2796 .key = ABORTED_COMMAND,
2797 .asc = 0x11, /* READ ERROR */
2798 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2800 [TCM_WRITE_PROTECTED] = {
2801 .key = DATA_PROTECT,
2802 .asc = 0x27, /* WRITE PROTECTED */
2804 [TCM_ADDRESS_OUT_OF_RANGE] = {
2805 .key = ILLEGAL_REQUEST,
2806 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2808 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2809 .key = UNIT_ATTENTION,
2811 [TCM_CHECK_CONDITION_NOT_READY] = {
2814 [TCM_MISCOMPARE_VERIFY] = {
2816 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2819 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
2820 .key = ABORTED_COMMAND,
2822 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2823 .add_sector_info = true,
2825 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
2826 .key = ABORTED_COMMAND,
2828 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2829 .add_sector_info = true,
2831 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
2832 .key = ABORTED_COMMAND,
2834 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2835 .add_sector_info = true,
2837 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2839 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2840 * Solaris initiators. Returning NOT READY instead means the
2841 * operations will be retried a finite number of times and we
2842 * can survive intermittent errors.
2845 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2849 static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
2851 const struct sense_info *si;
2852 u8 *buffer = cmd->sense_buffer;
2853 int r = (__force int)reason;
2855 bool desc_format = target_sense_desc_format(cmd->se_dev);
2857 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2858 si = &sense_info_table[r];
2860 si = &sense_info_table[(__force int)
2861 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2863 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2864 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2865 WARN_ON_ONCE(asc == 0);
2866 } else if (si->asc == 0) {
2867 WARN_ON_ONCE(cmd->scsi_asc == 0);
2868 asc = cmd->scsi_asc;
2869 ascq = cmd->scsi_ascq;
2875 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
2876 if (si->add_sector_info)
2877 return scsi_set_sense_information(buffer,
2878 cmd->scsi_sense_length,
2885 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2886 sense_reason_t reason, int from_transport)
2888 unsigned long flags;
2890 spin_lock_irqsave(&cmd->t_state_lock, flags);
2891 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2892 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2895 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2896 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2898 if (!from_transport) {
2901 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2902 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2903 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2904 rc = translate_sense_reason(cmd, reason);
2909 trace_target_cmd_complete(cmd);
2910 return cmd->se_tfo->queue_status(cmd);
2912 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2914 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2916 if (!(cmd->transport_state & CMD_T_ABORTED))
2920 * If cmd has been aborted but either no status is to be sent or it has
2921 * already been sent, just return
2923 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
2926 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n",
2927 cmd->t_task_cdb[0], cmd->tag);
2929 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
2930 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2931 trace_target_cmd_complete(cmd);
2932 cmd->se_tfo->queue_status(cmd);
2936 EXPORT_SYMBOL(transport_check_aborted_status);
2938 void transport_send_task_abort(struct se_cmd *cmd)
2940 unsigned long flags;
2942 spin_lock_irqsave(&cmd->t_state_lock, flags);
2943 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
2944 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2947 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2950 * If there are still expected incoming fabric WRITEs, we wait
2951 * until until they have completed before sending a TASK_ABORTED
2952 * response. This response with TASK_ABORTED status will be
2953 * queued back to fabric module by transport_check_aborted_status().
2955 if (cmd->data_direction == DMA_TO_DEVICE) {
2956 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2957 cmd->transport_state |= CMD_T_ABORTED;
2958 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
2962 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2964 transport_lun_remove_cmd(cmd);
2966 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
2967 cmd->t_task_cdb[0], cmd->tag);
2969 trace_target_cmd_complete(cmd);
2970 cmd->se_tfo->queue_status(cmd);
2973 static void target_tmr_work(struct work_struct *work)
2975 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2976 struct se_device *dev = cmd->se_dev;
2977 struct se_tmr_req *tmr = cmd->se_tmr_req;
2978 unsigned long flags;
2981 spin_lock_irqsave(&cmd->t_state_lock, flags);
2982 if (cmd->transport_state & CMD_T_ABORTED) {
2983 tmr->response = TMR_FUNCTION_REJECTED;
2984 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2987 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2989 switch (tmr->function) {
2990 case TMR_ABORT_TASK:
2991 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2993 case TMR_ABORT_TASK_SET:
2995 case TMR_CLEAR_TASK_SET:
2996 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2999 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3000 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3001 TMR_FUNCTION_REJECTED;
3002 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3003 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3004 cmd->orig_fe_lun, 0x29,
3005 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3008 case TMR_TARGET_WARM_RESET:
3009 tmr->response = TMR_FUNCTION_REJECTED;
3011 case TMR_TARGET_COLD_RESET:
3012 tmr->response = TMR_FUNCTION_REJECTED;
3015 pr_err("Uknown TMR function: 0x%02x.\n",
3017 tmr->response = TMR_FUNCTION_REJECTED;
3021 spin_lock_irqsave(&cmd->t_state_lock, flags);
3022 if (cmd->transport_state & CMD_T_ABORTED) {
3023 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3026 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3027 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3029 cmd->se_tfo->queue_tm_rsp(cmd);
3032 transport_cmd_check_stop_to_fabric(cmd);
3035 int transport_generic_handle_tmr(
3038 unsigned long flags;
3040 spin_lock_irqsave(&cmd->t_state_lock, flags);
3041 cmd->transport_state |= CMD_T_ACTIVE;
3042 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3044 INIT_WORK(&cmd->work, target_tmr_work);
3045 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3048 EXPORT_SYMBOL(transport_generic_handle_tmr);
3051 target_check_wce(struct se_device *dev)
3055 if (dev->transport->get_write_cache)
3056 wce = dev->transport->get_write_cache(dev);
3057 else if (dev->dev_attrib.emulate_write_cache > 0)
3064 target_check_fua(struct se_device *dev)
3066 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;