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 int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason);
68 static void transport_handle_queue_full(struct se_cmd *cmd,
69 struct se_device *dev, int err, bool write_pending);
70 static int transport_put_cmd(struct se_cmd *cmd);
71 static void target_complete_ok_work(struct work_struct *work);
73 int init_se_kmem_caches(void)
75 se_sess_cache = kmem_cache_create("se_sess_cache",
76 sizeof(struct se_session), __alignof__(struct se_session),
79 pr_err("kmem_cache_create() for struct se_session"
83 se_ua_cache = kmem_cache_create("se_ua_cache",
84 sizeof(struct se_ua), __alignof__(struct se_ua),
87 pr_err("kmem_cache_create() for struct se_ua failed\n");
88 goto out_free_sess_cache;
90 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
91 sizeof(struct t10_pr_registration),
92 __alignof__(struct t10_pr_registration), 0, NULL);
93 if (!t10_pr_reg_cache) {
94 pr_err("kmem_cache_create() for struct t10_pr_registration"
96 goto out_free_ua_cache;
98 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
99 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
101 if (!t10_alua_lu_gp_cache) {
102 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
104 goto out_free_pr_reg_cache;
106 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
107 sizeof(struct t10_alua_lu_gp_member),
108 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
109 if (!t10_alua_lu_gp_mem_cache) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
112 goto out_free_lu_gp_cache;
114 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
115 sizeof(struct t10_alua_tg_pt_gp),
116 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
117 if (!t10_alua_tg_pt_gp_cache) {
118 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
120 goto out_free_lu_gp_mem_cache;
122 t10_alua_lba_map_cache = kmem_cache_create(
123 "t10_alua_lba_map_cache",
124 sizeof(struct t10_alua_lba_map),
125 __alignof__(struct t10_alua_lba_map), 0, NULL);
126 if (!t10_alua_lba_map_cache) {
127 pr_err("kmem_cache_create() for t10_alua_lba_map_"
129 goto out_free_tg_pt_gp_cache;
131 t10_alua_lba_map_mem_cache = kmem_cache_create(
132 "t10_alua_lba_map_mem_cache",
133 sizeof(struct t10_alua_lba_map_member),
134 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
135 if (!t10_alua_lba_map_mem_cache) {
136 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
138 goto out_free_lba_map_cache;
141 target_completion_wq = alloc_workqueue("target_completion",
143 if (!target_completion_wq)
144 goto out_free_lba_map_mem_cache;
148 out_free_lba_map_mem_cache:
149 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
150 out_free_lba_map_cache:
151 kmem_cache_destroy(t10_alua_lba_map_cache);
152 out_free_tg_pt_gp_cache:
153 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
154 out_free_lu_gp_mem_cache:
155 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
156 out_free_lu_gp_cache:
157 kmem_cache_destroy(t10_alua_lu_gp_cache);
158 out_free_pr_reg_cache:
159 kmem_cache_destroy(t10_pr_reg_cache);
161 kmem_cache_destroy(se_ua_cache);
163 kmem_cache_destroy(se_sess_cache);
168 void release_se_kmem_caches(void)
170 destroy_workqueue(target_completion_wq);
171 kmem_cache_destroy(se_sess_cache);
172 kmem_cache_destroy(se_ua_cache);
173 kmem_cache_destroy(t10_pr_reg_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_cache);
175 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
176 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
177 kmem_cache_destroy(t10_alua_lba_map_cache);
178 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
181 /* This code ensures unique mib indexes are handed out. */
182 static DEFINE_SPINLOCK(scsi_mib_index_lock);
183 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
186 * Allocate a new row index for the entry type specified
188 u32 scsi_get_new_index(scsi_index_t type)
192 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
194 spin_lock(&scsi_mib_index_lock);
195 new_index = ++scsi_mib_index[type];
196 spin_unlock(&scsi_mib_index_lock);
201 void transport_subsystem_check_init(void)
204 static int sub_api_initialized;
206 if (sub_api_initialized)
209 ret = request_module("target_core_iblock");
211 pr_err("Unable to load target_core_iblock\n");
213 ret = request_module("target_core_file");
215 pr_err("Unable to load target_core_file\n");
217 ret = request_module("target_core_pscsi");
219 pr_err("Unable to load target_core_pscsi\n");
221 ret = request_module("target_core_user");
223 pr_err("Unable to load target_core_user\n");
225 sub_api_initialized = 1;
228 struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
230 struct se_session *se_sess;
232 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
234 pr_err("Unable to allocate struct se_session from"
236 return ERR_PTR(-ENOMEM);
238 INIT_LIST_HEAD(&se_sess->sess_list);
239 INIT_LIST_HEAD(&se_sess->sess_acl_list);
240 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
241 INIT_LIST_HEAD(&se_sess->sess_wait_list);
242 spin_lock_init(&se_sess->sess_cmd_lock);
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 if (tag_num != 0 && !tag_size) {
285 pr_err("init_session_tags called with percpu-ida tag_num:"
286 " %u, but zero tag_size\n", tag_num);
287 return ERR_PTR(-EINVAL);
289 if (!tag_num && tag_size) {
290 pr_err("init_session_tags called with percpu-ida tag_size:"
291 " %u, but zero tag_num\n", tag_size);
292 return ERR_PTR(-EINVAL);
295 se_sess = transport_init_session(sup_prot_ops);
299 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
301 transport_free_session(se_sess);
302 return ERR_PTR(-ENOMEM);
307 EXPORT_SYMBOL(transport_init_session_tags);
310 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
312 void __transport_register_session(
313 struct se_portal_group *se_tpg,
314 struct se_node_acl *se_nacl,
315 struct se_session *se_sess,
316 void *fabric_sess_ptr)
318 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
319 unsigned char buf[PR_REG_ISID_LEN];
321 se_sess->se_tpg = se_tpg;
322 se_sess->fabric_sess_ptr = fabric_sess_ptr;
324 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
326 * Only set for struct se_session's that will actually be moving I/O.
327 * eg: *NOT* discovery sessions.
332 * Determine if fabric allows for T10-PI feature bits exposed to
333 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
335 * If so, then always save prot_type on a per se_node_acl node
336 * basis and re-instate the previous sess_prot_type to avoid
337 * disabling PI from below any previously initiator side
340 if (se_nacl->saved_prot_type)
341 se_sess->sess_prot_type = se_nacl->saved_prot_type;
342 else if (tfo->tpg_check_prot_fabric_only)
343 se_sess->sess_prot_type = se_nacl->saved_prot_type =
344 tfo->tpg_check_prot_fabric_only(se_tpg);
346 * If the fabric module supports an ISID based TransportID,
347 * save this value in binary from the fabric I_T Nexus now.
349 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
350 memset(&buf[0], 0, PR_REG_ISID_LEN);
351 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
352 &buf[0], PR_REG_ISID_LEN);
353 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
356 spin_lock_irq(&se_nacl->nacl_sess_lock);
358 * The se_nacl->nacl_sess pointer will be set to the
359 * last active I_T Nexus for each struct se_node_acl.
361 se_nacl->nacl_sess = se_sess;
363 list_add_tail(&se_sess->sess_acl_list,
364 &se_nacl->acl_sess_list);
365 spin_unlock_irq(&se_nacl->nacl_sess_lock);
367 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
369 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
370 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
372 EXPORT_SYMBOL(__transport_register_session);
374 void transport_register_session(
375 struct se_portal_group *se_tpg,
376 struct se_node_acl *se_nacl,
377 struct se_session *se_sess,
378 void *fabric_sess_ptr)
382 spin_lock_irqsave(&se_tpg->session_lock, flags);
383 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
384 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
386 EXPORT_SYMBOL(transport_register_session);
389 target_alloc_session(struct se_portal_group *tpg,
390 unsigned int tag_num, unsigned int tag_size,
391 enum target_prot_op prot_op,
392 const char *initiatorname, void *private,
393 int (*callback)(struct se_portal_group *,
394 struct se_session *, void *))
396 struct se_session *sess;
399 * If the fabric driver is using percpu-ida based pre allocation
400 * of I/O descriptor tags, go ahead and perform that setup now..
403 sess = transport_init_session_tags(tag_num, tag_size, prot_op);
405 sess = transport_init_session(prot_op);
410 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
411 (unsigned char *)initiatorname);
412 if (!sess->se_node_acl) {
413 transport_free_session(sess);
414 return ERR_PTR(-EACCES);
417 * Go ahead and perform any remaining fabric setup that is
418 * required before transport_register_session().
420 if (callback != NULL) {
421 int rc = callback(tpg, sess, private);
423 transport_free_session(sess);
428 transport_register_session(tpg, sess->se_node_acl, sess, private);
431 EXPORT_SYMBOL(target_alloc_session);
433 ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
435 struct se_session *se_sess;
438 spin_lock_bh(&se_tpg->session_lock);
439 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
440 if (!se_sess->se_node_acl)
442 if (!se_sess->se_node_acl->dynamic_node_acl)
444 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
447 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
448 se_sess->se_node_acl->initiatorname);
449 len += 1; /* Include NULL terminator */
451 spin_unlock_bh(&se_tpg->session_lock);
455 EXPORT_SYMBOL(target_show_dynamic_sessions);
457 static void target_complete_nacl(struct kref *kref)
459 struct se_node_acl *nacl = container_of(kref,
460 struct se_node_acl, acl_kref);
461 struct se_portal_group *se_tpg = nacl->se_tpg;
463 if (!nacl->dynamic_stop) {
464 complete(&nacl->acl_free_comp);
468 mutex_lock(&se_tpg->acl_node_mutex);
469 list_del(&nacl->acl_list);
470 mutex_unlock(&se_tpg->acl_node_mutex);
472 core_tpg_wait_for_nacl_pr_ref(nacl);
473 core_free_device_list_for_node(nacl, se_tpg);
477 void target_put_nacl(struct se_node_acl *nacl)
479 kref_put(&nacl->acl_kref, target_complete_nacl);
481 EXPORT_SYMBOL(target_put_nacl);
483 void transport_deregister_session_configfs(struct se_session *se_sess)
485 struct se_node_acl *se_nacl;
488 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
490 se_nacl = se_sess->se_node_acl;
492 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
493 if (!list_empty(&se_sess->sess_acl_list))
494 list_del_init(&se_sess->sess_acl_list);
496 * If the session list is empty, then clear the pointer.
497 * Otherwise, set the struct se_session pointer from the tail
498 * element of the per struct se_node_acl active session list.
500 if (list_empty(&se_nacl->acl_sess_list))
501 se_nacl->nacl_sess = NULL;
503 se_nacl->nacl_sess = container_of(
504 se_nacl->acl_sess_list.prev,
505 struct se_session, sess_acl_list);
507 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
510 EXPORT_SYMBOL(transport_deregister_session_configfs);
512 void transport_free_session(struct se_session *se_sess)
514 struct se_node_acl *se_nacl = se_sess->se_node_acl;
517 * Drop the se_node_acl->nacl_kref obtained from within
518 * core_tpg_get_initiator_node_acl().
521 struct se_portal_group *se_tpg = se_nacl->se_tpg;
522 const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo;
525 se_sess->se_node_acl = NULL;
528 * Also determine if we need to drop the extra ->cmd_kref if
529 * it had been previously dynamically generated, and
530 * the endpoint is not caching dynamic ACLs.
532 mutex_lock(&se_tpg->acl_node_mutex);
533 if (se_nacl->dynamic_node_acl &&
534 !se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
535 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
536 if (list_empty(&se_nacl->acl_sess_list))
537 se_nacl->dynamic_stop = true;
538 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
540 if (se_nacl->dynamic_stop)
541 list_del(&se_nacl->acl_list);
543 mutex_unlock(&se_tpg->acl_node_mutex);
545 if (se_nacl->dynamic_stop)
546 target_put_nacl(se_nacl);
548 target_put_nacl(se_nacl);
550 if (se_sess->sess_cmd_map) {
551 percpu_ida_destroy(&se_sess->sess_tag_pool);
552 kvfree(se_sess->sess_cmd_map);
554 kmem_cache_free(se_sess_cache, se_sess);
556 EXPORT_SYMBOL(transport_free_session);
558 void transport_deregister_session(struct se_session *se_sess)
560 struct se_portal_group *se_tpg = se_sess->se_tpg;
564 transport_free_session(se_sess);
568 spin_lock_irqsave(&se_tpg->session_lock, flags);
569 list_del(&se_sess->sess_list);
570 se_sess->se_tpg = NULL;
571 se_sess->fabric_sess_ptr = NULL;
572 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
574 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
575 se_tpg->se_tpg_tfo->get_fabric_name());
577 * If last kref is dropping now for an explicit NodeACL, awake sleeping
578 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
579 * removal context from within transport_free_session() code.
581 * For dynamic ACL, target_put_nacl() uses target_complete_nacl()
582 * to release all remaining generate_node_acl=1 created ACL resources.
585 transport_free_session(se_sess);
587 EXPORT_SYMBOL(transport_deregister_session);
589 static void target_remove_from_state_list(struct se_cmd *cmd)
591 struct se_device *dev = cmd->se_dev;
597 spin_lock_irqsave(&dev->execute_task_lock, flags);
598 if (cmd->state_active) {
599 list_del(&cmd->state_list);
600 cmd->state_active = false;
602 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
605 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
609 target_remove_from_state_list(cmd);
612 * Clear struct se_cmd->se_lun before the handoff to FE.
616 spin_lock_irqsave(&cmd->t_state_lock, flags);
618 * Determine if frontend context caller is requesting the stopping of
619 * this command for frontend exceptions.
621 if (cmd->transport_state & CMD_T_STOP) {
622 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
623 __func__, __LINE__, cmd->tag);
625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
627 complete_all(&cmd->t_transport_stop_comp);
630 cmd->transport_state &= ~CMD_T_ACTIVE;
631 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
634 * Some fabric modules like tcm_loop can release their internally
635 * allocated I/O reference and struct se_cmd now.
637 * Fabric modules are expected to return '1' here if the se_cmd being
638 * passed is released at this point, or zero if not being released.
640 return cmd->se_tfo->check_stop_free(cmd);
643 static void transport_lun_remove_cmd(struct se_cmd *cmd)
645 struct se_lun *lun = cmd->se_lun;
650 if (cmpxchg(&cmd->lun_ref_active, true, false))
651 percpu_ref_put(&lun->lun_ref);
654 int transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
656 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
659 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
660 transport_lun_remove_cmd(cmd);
662 * Allow the fabric driver to unmap any resources before
663 * releasing the descriptor via TFO->release_cmd()
666 cmd->se_tfo->aborted_task(cmd);
668 if (transport_cmd_check_stop_to_fabric(cmd))
670 if (remove && ack_kref)
671 ret = transport_put_cmd(cmd);
676 static void target_complete_failure_work(struct work_struct *work)
678 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
680 transport_generic_request_failure(cmd,
681 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
685 * Used when asking transport to copy Sense Data from the underlying
686 * Linux/SCSI struct scsi_cmnd
688 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
690 struct se_device *dev = cmd->se_dev;
692 WARN_ON(!cmd->se_lun);
697 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
700 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
702 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
703 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
704 return cmd->sense_buffer;
707 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
709 struct se_device *dev = cmd->se_dev;
710 int success = scsi_status == GOOD;
713 cmd->scsi_status = scsi_status;
716 spin_lock_irqsave(&cmd->t_state_lock, flags);
718 if (dev && dev->transport->transport_complete) {
719 dev->transport->transport_complete(cmd,
721 transport_get_sense_buffer(cmd));
722 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
727 * Check for case where an explicit ABORT_TASK has been received
728 * and transport_wait_for_tasks() will be waiting for completion..
730 if (cmd->transport_state & CMD_T_ABORTED ||
731 cmd->transport_state & CMD_T_STOP) {
732 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
733 complete_all(&cmd->t_transport_stop_comp);
735 } else if (!success) {
736 INIT_WORK(&cmd->work, target_complete_failure_work);
738 INIT_WORK(&cmd->work, target_complete_ok_work);
741 cmd->t_state = TRANSPORT_COMPLETE;
742 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
743 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
745 if (cmd->se_cmd_flags & SCF_USE_CPUID)
746 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
748 queue_work(target_completion_wq, &cmd->work);
750 EXPORT_SYMBOL(target_complete_cmd);
752 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
754 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
755 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
756 cmd->residual_count += cmd->data_length - length;
758 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
759 cmd->residual_count = cmd->data_length - length;
762 cmd->data_length = length;
765 target_complete_cmd(cmd, scsi_status);
767 EXPORT_SYMBOL(target_complete_cmd_with_length);
769 static void target_add_to_state_list(struct se_cmd *cmd)
771 struct se_device *dev = cmd->se_dev;
774 spin_lock_irqsave(&dev->execute_task_lock, flags);
775 if (!cmd->state_active) {
776 list_add_tail(&cmd->state_list, &dev->state_list);
777 cmd->state_active = true;
779 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
783 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
785 static void transport_write_pending_qf(struct se_cmd *cmd);
786 static void transport_complete_qf(struct se_cmd *cmd);
788 void target_qf_do_work(struct work_struct *work)
790 struct se_device *dev = container_of(work, struct se_device,
792 LIST_HEAD(qf_cmd_list);
793 struct se_cmd *cmd, *cmd_tmp;
795 spin_lock_irq(&dev->qf_cmd_lock);
796 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
797 spin_unlock_irq(&dev->qf_cmd_lock);
799 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
800 list_del(&cmd->se_qf_node);
801 atomic_dec_mb(&dev->dev_qf_count);
803 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
804 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
805 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
806 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
809 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
810 transport_write_pending_qf(cmd);
811 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK ||
812 cmd->t_state == TRANSPORT_COMPLETE_QF_ERR)
813 transport_complete_qf(cmd);
817 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
819 switch (cmd->data_direction) {
822 case DMA_FROM_DEVICE:
826 case DMA_BIDIRECTIONAL:
835 void transport_dump_dev_state(
836 struct se_device *dev,
840 *bl += sprintf(b + *bl, "Status: ");
841 if (dev->export_count)
842 *bl += sprintf(b + *bl, "ACTIVATED");
844 *bl += sprintf(b + *bl, "DEACTIVATED");
846 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
847 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
848 dev->dev_attrib.block_size,
849 dev->dev_attrib.hw_max_sectors);
850 *bl += sprintf(b + *bl, " ");
853 void transport_dump_vpd_proto_id(
855 unsigned char *p_buf,
858 unsigned char buf[VPD_TMP_BUF_SIZE];
861 memset(buf, 0, VPD_TMP_BUF_SIZE);
862 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
864 switch (vpd->protocol_identifier) {
866 sprintf(buf+len, "Fibre Channel\n");
869 sprintf(buf+len, "Parallel SCSI\n");
872 sprintf(buf+len, "SSA\n");
875 sprintf(buf+len, "IEEE 1394\n");
878 sprintf(buf+len, "SCSI Remote Direct Memory Access"
882 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
885 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
888 sprintf(buf+len, "Automation/Drive Interface Transport"
892 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
895 sprintf(buf+len, "Unknown 0x%02x\n",
896 vpd->protocol_identifier);
901 strncpy(p_buf, buf, p_buf_len);
907 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
910 * Check if the Protocol Identifier Valid (PIV) bit is set..
912 * from spc3r23.pdf section 7.5.1
914 if (page_83[1] & 0x80) {
915 vpd->protocol_identifier = (page_83[0] & 0xf0);
916 vpd->protocol_identifier_set = 1;
917 transport_dump_vpd_proto_id(vpd, NULL, 0);
920 EXPORT_SYMBOL(transport_set_vpd_proto_id);
922 int transport_dump_vpd_assoc(
924 unsigned char *p_buf,
927 unsigned char buf[VPD_TMP_BUF_SIZE];
931 memset(buf, 0, VPD_TMP_BUF_SIZE);
932 len = sprintf(buf, "T10 VPD Identifier Association: ");
934 switch (vpd->association) {
936 sprintf(buf+len, "addressed logical unit\n");
939 sprintf(buf+len, "target port\n");
942 sprintf(buf+len, "SCSI target device\n");
945 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
951 strncpy(p_buf, buf, p_buf_len);
958 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
961 * The VPD identification association..
963 * from spc3r23.pdf Section 7.6.3.1 Table 297
965 vpd->association = (page_83[1] & 0x30);
966 return transport_dump_vpd_assoc(vpd, NULL, 0);
968 EXPORT_SYMBOL(transport_set_vpd_assoc);
970 int transport_dump_vpd_ident_type(
972 unsigned char *p_buf,
975 unsigned char buf[VPD_TMP_BUF_SIZE];
979 memset(buf, 0, VPD_TMP_BUF_SIZE);
980 len = sprintf(buf, "T10 VPD Identifier Type: ");
982 switch (vpd->device_identifier_type) {
984 sprintf(buf+len, "Vendor specific\n");
987 sprintf(buf+len, "T10 Vendor ID based\n");
990 sprintf(buf+len, "EUI-64 based\n");
993 sprintf(buf+len, "NAA\n");
996 sprintf(buf+len, "Relative target port identifier\n");
999 sprintf(buf+len, "SCSI name string\n");
1002 sprintf(buf+len, "Unsupported: 0x%02x\n",
1003 vpd->device_identifier_type);
1009 if (p_buf_len < strlen(buf)+1)
1011 strncpy(p_buf, buf, p_buf_len);
1013 pr_debug("%s", buf);
1019 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1022 * The VPD identifier type..
1024 * from spc3r23.pdf Section 7.6.3.1 Table 298
1026 vpd->device_identifier_type = (page_83[1] & 0x0f);
1027 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1029 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1031 int transport_dump_vpd_ident(
1032 struct t10_vpd *vpd,
1033 unsigned char *p_buf,
1036 unsigned char buf[VPD_TMP_BUF_SIZE];
1039 memset(buf, 0, VPD_TMP_BUF_SIZE);
1041 switch (vpd->device_identifier_code_set) {
1042 case 0x01: /* Binary */
1043 snprintf(buf, sizeof(buf),
1044 "T10 VPD Binary Device Identifier: %s\n",
1045 &vpd->device_identifier[0]);
1047 case 0x02: /* ASCII */
1048 snprintf(buf, sizeof(buf),
1049 "T10 VPD ASCII Device Identifier: %s\n",
1050 &vpd->device_identifier[0]);
1052 case 0x03: /* UTF-8 */
1053 snprintf(buf, sizeof(buf),
1054 "T10 VPD UTF-8 Device Identifier: %s\n",
1055 &vpd->device_identifier[0]);
1058 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1059 " 0x%02x", vpd->device_identifier_code_set);
1065 strncpy(p_buf, buf, p_buf_len);
1067 pr_debug("%s", buf);
1073 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1075 static const char hex_str[] = "0123456789abcdef";
1076 int j = 0, i = 4; /* offset to start of the identifier */
1079 * The VPD Code Set (encoding)
1081 * from spc3r23.pdf Section 7.6.3.1 Table 296
1083 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1084 switch (vpd->device_identifier_code_set) {
1085 case 0x01: /* Binary */
1086 vpd->device_identifier[j++] =
1087 hex_str[vpd->device_identifier_type];
1088 while (i < (4 + page_83[3])) {
1089 vpd->device_identifier[j++] =
1090 hex_str[(page_83[i] & 0xf0) >> 4];
1091 vpd->device_identifier[j++] =
1092 hex_str[page_83[i] & 0x0f];
1096 case 0x02: /* ASCII */
1097 case 0x03: /* UTF-8 */
1098 while (i < (4 + page_83[3]))
1099 vpd->device_identifier[j++] = page_83[i++];
1105 return transport_dump_vpd_ident(vpd, NULL, 0);
1107 EXPORT_SYMBOL(transport_set_vpd_ident);
1109 static sense_reason_t
1110 target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1115 if (!cmd->se_tfo->max_data_sg_nents)
1116 return TCM_NO_SENSE;
1118 * Check if fabric enforced maximum SGL entries per I/O descriptor
1119 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1120 * residual_count and reduce original cmd->data_length to maximum
1121 * length based on single PAGE_SIZE entry scatter-lists.
1123 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1124 if (cmd->data_length > mtl) {
1126 * If an existing CDB overflow is present, calculate new residual
1127 * based on CDB size minus fabric maximum transfer length.
1129 * If an existing CDB underflow is present, calculate new residual
1130 * based on original cmd->data_length minus fabric maximum transfer
1133 * Otherwise, set the underflow residual based on cmd->data_length
1134 * minus fabric maximum transfer length.
1136 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1137 cmd->residual_count = (size - mtl);
1138 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1139 u32 orig_dl = size + cmd->residual_count;
1140 cmd->residual_count = (orig_dl - mtl);
1142 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1143 cmd->residual_count = (cmd->data_length - mtl);
1145 cmd->data_length = mtl;
1147 * Reset sbc_check_prot() calculated protection payload
1148 * length based upon the new smaller MTL.
1150 if (cmd->prot_length) {
1151 u32 sectors = (mtl / dev->dev_attrib.block_size);
1152 cmd->prot_length = dev->prot_length * sectors;
1155 return TCM_NO_SENSE;
1159 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1161 struct se_device *dev = cmd->se_dev;
1163 if (cmd->unknown_data_length) {
1164 cmd->data_length = size;
1165 } else if (size != cmd->data_length) {
1166 pr_warn_ratelimited("TARGET_CORE[%s]: Expected Transfer Length:"
1167 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1168 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1169 cmd->data_length, size, cmd->t_task_cdb[0]);
1171 if (cmd->data_direction == DMA_TO_DEVICE) {
1172 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1173 pr_err_ratelimited("Rejecting underflow/overflow"
1174 " for WRITE data CDB\n");
1175 return TCM_INVALID_CDB_FIELD;
1178 * Some fabric drivers like iscsi-target still expect to
1179 * always reject overflow writes. Reject this case until
1180 * full fabric driver level support for overflow writes
1181 * is introduced tree-wide.
1183 if (size > cmd->data_length) {
1184 pr_err_ratelimited("Rejecting overflow for"
1185 " WRITE control CDB\n");
1186 return TCM_INVALID_CDB_FIELD;
1190 * Reject READ_* or WRITE_* with overflow/underflow for
1191 * type SCF_SCSI_DATA_CDB.
1193 if (dev->dev_attrib.block_size != 512) {
1194 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1195 " CDB on non 512-byte sector setup subsystem"
1196 " plugin: %s\n", dev->transport->name);
1197 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1198 return TCM_INVALID_CDB_FIELD;
1201 * For the overflow case keep the existing fabric provided
1202 * ->data_length. Otherwise for the underflow case, reset
1203 * ->data_length to the smaller SCSI expected data transfer
1206 if (size > cmd->data_length) {
1207 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1208 cmd->residual_count = (size - cmd->data_length);
1210 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1211 cmd->residual_count = (cmd->data_length - size);
1212 cmd->data_length = size;
1216 return target_check_max_data_sg_nents(cmd, dev, size);
1221 * Used by fabric modules containing a local struct se_cmd within their
1222 * fabric dependent per I/O descriptor.
1224 * Preserves the value of @cmd->tag.
1226 void transport_init_se_cmd(
1228 const struct target_core_fabric_ops *tfo,
1229 struct se_session *se_sess,
1233 unsigned char *sense_buffer)
1235 INIT_LIST_HEAD(&cmd->se_delayed_node);
1236 INIT_LIST_HEAD(&cmd->se_qf_node);
1237 INIT_LIST_HEAD(&cmd->se_cmd_list);
1238 INIT_LIST_HEAD(&cmd->state_list);
1239 init_completion(&cmd->t_transport_stop_comp);
1240 init_completion(&cmd->cmd_wait_comp);
1241 spin_lock_init(&cmd->t_state_lock);
1242 kref_init(&cmd->cmd_kref);
1245 cmd->se_sess = se_sess;
1246 cmd->data_length = data_length;
1247 cmd->data_direction = data_direction;
1248 cmd->sam_task_attr = task_attr;
1249 cmd->sense_buffer = sense_buffer;
1251 cmd->state_active = false;
1253 EXPORT_SYMBOL(transport_init_se_cmd);
1255 static sense_reason_t
1256 transport_check_alloc_task_attr(struct se_cmd *cmd)
1258 struct se_device *dev = cmd->se_dev;
1261 * Check if SAM Task Attribute emulation is enabled for this
1262 * struct se_device storage object
1264 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1267 if (cmd->sam_task_attr == TCM_ACA_TAG) {
1268 pr_debug("SAM Task Attribute ACA"
1269 " emulation is not supported\n");
1270 return TCM_INVALID_CDB_FIELD;
1277 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1279 struct se_device *dev = cmd->se_dev;
1283 * Ensure that the received CDB is less than the max (252 + 8) bytes
1284 * for VARIABLE_LENGTH_CMD
1286 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1287 pr_err("Received SCSI CDB with command_size: %d that"
1288 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1289 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1290 return TCM_INVALID_CDB_FIELD;
1293 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1294 * allocate the additional extended CDB buffer now.. Otherwise
1295 * setup the pointer from __t_task_cdb to t_task_cdb.
1297 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1298 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1300 if (!cmd->t_task_cdb) {
1301 pr_err("Unable to allocate cmd->t_task_cdb"
1302 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1303 scsi_command_size(cdb),
1304 (unsigned long)sizeof(cmd->__t_task_cdb));
1305 return TCM_OUT_OF_RESOURCES;
1308 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1310 * Copy the original CDB into cmd->
1312 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1314 trace_target_sequencer_start(cmd);
1316 ret = dev->transport->parse_cdb(cmd);
1317 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1318 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1319 cmd->se_tfo->get_fabric_name(),
1320 cmd->se_sess->se_node_acl->initiatorname,
1321 cmd->t_task_cdb[0]);
1325 ret = transport_check_alloc_task_attr(cmd);
1329 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1330 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
1333 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1336 * Used by fabric module frontends to queue tasks directly.
1337 * May only be used from process context.
1339 int transport_handle_cdb_direct(
1346 pr_err("cmd->se_lun is NULL\n");
1349 if (in_interrupt()) {
1351 pr_err("transport_generic_handle_cdb cannot be called"
1352 " from interrupt context\n");
1356 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1357 * outstanding descriptors are handled correctly during shutdown via
1358 * transport_wait_for_tasks()
1360 * Also, we don't take cmd->t_state_lock here as we only expect
1361 * this to be called for initial descriptor submission.
1363 cmd->t_state = TRANSPORT_NEW_CMD;
1364 cmd->transport_state |= CMD_T_ACTIVE;
1367 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1368 * so follow TRANSPORT_NEW_CMD processing thread context usage
1369 * and call transport_generic_request_failure() if necessary..
1371 ret = transport_generic_new_cmd(cmd);
1373 transport_generic_request_failure(cmd, ret);
1376 EXPORT_SYMBOL(transport_handle_cdb_direct);
1379 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1380 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1382 if (!sgl || !sgl_count)
1386 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1387 * scatterlists already have been set to follow what the fabric
1388 * passes for the original expected data transfer length.
1390 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1391 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1392 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1393 return TCM_INVALID_CDB_FIELD;
1396 cmd->t_data_sg = sgl;
1397 cmd->t_data_nents = sgl_count;
1398 cmd->t_bidi_data_sg = sgl_bidi;
1399 cmd->t_bidi_data_nents = sgl_bidi_count;
1401 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1406 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1407 * se_cmd + use pre-allocated SGL memory.
1409 * @se_cmd: command descriptor to submit
1410 * @se_sess: associated se_sess for endpoint
1411 * @cdb: pointer to SCSI CDB
1412 * @sense: pointer to SCSI sense buffer
1413 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1414 * @data_length: fabric expected data transfer length
1415 * @task_addr: SAM task attribute
1416 * @data_dir: DMA data direction
1417 * @flags: flags for command submission from target_sc_flags_tables
1418 * @sgl: struct scatterlist memory for unidirectional mapping
1419 * @sgl_count: scatterlist count for unidirectional mapping
1420 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1421 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1422 * @sgl_prot: struct scatterlist memory protection information
1423 * @sgl_prot_count: scatterlist count for protection information
1425 * Task tags are supported if the caller has set @se_cmd->tag.
1427 * Returns non zero to signal active I/O shutdown failure. All other
1428 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1429 * but still return zero here.
1431 * This may only be called from process context, and also currently
1432 * assumes internal allocation of fabric payload buffer by target-core.
1434 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1435 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1436 u32 data_length, int task_attr, int data_dir, int flags,
1437 struct scatterlist *sgl, u32 sgl_count,
1438 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1439 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1441 struct se_portal_group *se_tpg;
1445 se_tpg = se_sess->se_tpg;
1447 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1448 BUG_ON(in_interrupt());
1450 * Initialize se_cmd for target operation. From this point
1451 * exceptions are handled by sending exception status via
1452 * target_core_fabric_ops->queue_status() callback
1454 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1455 data_length, data_dir, task_attr, sense);
1457 if (flags & TARGET_SCF_USE_CPUID)
1458 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1460 se_cmd->cpuid = WORK_CPU_UNBOUND;
1462 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1463 se_cmd->unknown_data_length = 1;
1465 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1466 * se_sess->sess_cmd_list. A second kref_get here is necessary
1467 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1468 * kref_put() to happen during fabric packet acknowledgement.
1470 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1474 * Signal bidirectional data payloads to target-core
1476 if (flags & TARGET_SCF_BIDI_OP)
1477 se_cmd->se_cmd_flags |= SCF_BIDI;
1479 * Locate se_lun pointer and attach it to struct se_cmd
1481 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1483 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1484 target_put_sess_cmd(se_cmd);
1488 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1490 transport_generic_request_failure(se_cmd, rc);
1495 * Save pointers for SGLs containing protection information,
1498 if (sgl_prot_count) {
1499 se_cmd->t_prot_sg = sgl_prot;
1500 se_cmd->t_prot_nents = sgl_prot_count;
1501 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
1505 * When a non zero sgl_count has been passed perform SGL passthrough
1506 * mapping for pre-allocated fabric memory instead of having target
1507 * core perform an internal SGL allocation..
1509 if (sgl_count != 0) {
1513 * A work-around for tcm_loop as some userspace code via
1514 * scsi-generic do not memset their associated read buffers,
1515 * so go ahead and do that here for type non-data CDBs. Also
1516 * note that this is currently guaranteed to be a single SGL
1517 * for this case by target core in target_setup_cmd_from_cdb()
1518 * -> transport_generic_cmd_sequencer().
1520 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1521 se_cmd->data_direction == DMA_FROM_DEVICE) {
1522 unsigned char *buf = NULL;
1525 buf = kmap(sg_page(sgl)) + sgl->offset;
1528 memset(buf, 0, sgl->length);
1529 kunmap(sg_page(sgl));
1533 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1534 sgl_bidi, sgl_bidi_count);
1536 transport_generic_request_failure(se_cmd, rc);
1542 * Check if we need to delay processing because of ALUA
1543 * Active/NonOptimized primary access state..
1545 core_alua_check_nonop_delay(se_cmd);
1547 transport_handle_cdb_direct(se_cmd);
1550 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1553 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1555 * @se_cmd: command descriptor to submit
1556 * @se_sess: associated se_sess for endpoint
1557 * @cdb: pointer to SCSI CDB
1558 * @sense: pointer to SCSI sense buffer
1559 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1560 * @data_length: fabric expected data transfer length
1561 * @task_addr: SAM task attribute
1562 * @data_dir: DMA data direction
1563 * @flags: flags for command submission from target_sc_flags_tables
1565 * Task tags are supported if the caller has set @se_cmd->tag.
1567 * Returns non zero to signal active I/O shutdown failure. All other
1568 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1569 * but still return zero here.
1571 * This may only be called from process context, and also currently
1572 * assumes internal allocation of fabric payload buffer by target-core.
1574 * It also assumes interal target core SGL memory allocation.
1576 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1577 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1578 u32 data_length, int task_attr, int data_dir, int flags)
1580 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1581 unpacked_lun, data_length, task_attr, data_dir,
1582 flags, NULL, 0, NULL, 0, NULL, 0);
1584 EXPORT_SYMBOL(target_submit_cmd);
1586 static void target_complete_tmr_failure(struct work_struct *work)
1588 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1590 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1591 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1593 transport_cmd_check_stop_to_fabric(se_cmd);
1597 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1600 * @se_cmd: command descriptor to submit
1601 * @se_sess: associated se_sess for endpoint
1602 * @sense: pointer to SCSI sense buffer
1603 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1604 * @fabric_context: fabric context for TMR req
1605 * @tm_type: Type of TM request
1606 * @gfp: gfp type for caller
1607 * @tag: referenced task tag for TMR_ABORT_TASK
1608 * @flags: submit cmd flags
1610 * Callable from all contexts.
1613 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1614 unsigned char *sense, u64 unpacked_lun,
1615 void *fabric_tmr_ptr, unsigned char tm_type,
1616 gfp_t gfp, u64 tag, int flags)
1618 struct se_portal_group *se_tpg;
1621 se_tpg = se_sess->se_tpg;
1624 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1625 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
1627 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1628 * allocation failure.
1630 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1634 if (tm_type == TMR_ABORT_TASK)
1635 se_cmd->se_tmr_req->ref_task_tag = tag;
1637 /* See target_submit_cmd for commentary */
1638 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1640 core_tmr_release_req(se_cmd->se_tmr_req);
1644 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1647 * For callback during failure handling, push this work off
1648 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1650 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1651 schedule_work(&se_cmd->work);
1654 transport_generic_handle_tmr(se_cmd);
1657 EXPORT_SYMBOL(target_submit_tmr);
1660 * Handle SAM-esque emulation for generic transport request failures.
1662 void transport_generic_request_failure(struct se_cmd *cmd,
1663 sense_reason_t sense_reason)
1665 int ret = 0, post_ret = 0;
1667 if (transport_check_aborted_status(cmd, 1))
1670 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1671 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
1672 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1673 cmd->se_tfo->get_cmd_state(cmd),
1674 cmd->t_state, sense_reason);
1675 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1676 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1677 (cmd->transport_state & CMD_T_STOP) != 0,
1678 (cmd->transport_state & CMD_T_SENT) != 0);
1681 * For SAM Task Attribute emulation for failed struct se_cmd
1683 transport_complete_task_attr(cmd);
1685 * Handle special case for COMPARE_AND_WRITE failure, where the
1686 * callback is expected to drop the per device ->caw_sem.
1688 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1689 cmd->transport_complete_callback)
1690 cmd->transport_complete_callback(cmd, false, &post_ret);
1692 switch (sense_reason) {
1693 case TCM_NON_EXISTENT_LUN:
1694 case TCM_UNSUPPORTED_SCSI_OPCODE:
1695 case TCM_INVALID_CDB_FIELD:
1696 case TCM_INVALID_PARAMETER_LIST:
1697 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1698 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1699 case TCM_UNKNOWN_MODE_PAGE:
1700 case TCM_WRITE_PROTECTED:
1701 case TCM_ADDRESS_OUT_OF_RANGE:
1702 case TCM_CHECK_CONDITION_ABORT_CMD:
1703 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1704 case TCM_CHECK_CONDITION_NOT_READY:
1705 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1706 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1707 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1708 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
1709 case TCM_TOO_MANY_TARGET_DESCS:
1710 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE:
1711 case TCM_TOO_MANY_SEGMENT_DESCS:
1712 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE:
1714 case TCM_OUT_OF_RESOURCES:
1715 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1717 case TCM_RESERVATION_CONFLICT:
1719 * No SENSE Data payload for this case, set SCSI Status
1720 * and queue the response to $FABRIC_MOD.
1722 * Uses linux/include/scsi/scsi.h SAM status codes defs
1724 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1726 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1727 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1730 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1733 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1734 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1735 cmd->orig_fe_lun, 0x2C,
1736 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1738 trace_target_cmd_complete(cmd);
1739 ret = cmd->se_tfo->queue_status(cmd);
1744 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1745 cmd->t_task_cdb[0], sense_reason);
1746 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1750 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1755 transport_lun_remove_cmd(cmd);
1756 transport_cmd_check_stop_to_fabric(cmd);
1760 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
1762 EXPORT_SYMBOL(transport_generic_request_failure);
1764 void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
1768 if (!cmd->execute_cmd) {
1769 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1774 * Check for an existing UNIT ATTENTION condition after
1775 * target_handle_task_attr() has done SAM task attr
1776 * checking, and possibly have already defered execution
1777 * out to target_restart_delayed_cmds() context.
1779 ret = target_scsi3_ua_check(cmd);
1783 ret = target_alua_state_check(cmd);
1787 ret = target_check_reservation(cmd);
1789 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1794 ret = cmd->execute_cmd(cmd);
1798 spin_lock_irq(&cmd->t_state_lock);
1799 cmd->transport_state &= ~CMD_T_SENT;
1800 spin_unlock_irq(&cmd->t_state_lock);
1802 transport_generic_request_failure(cmd, ret);
1805 static int target_write_prot_action(struct se_cmd *cmd)
1809 * Perform WRITE_INSERT of PI using software emulation when backend
1810 * device has PI enabled, if the transport has not already generated
1811 * PI using hardware WRITE_INSERT offload.
1813 switch (cmd->prot_op) {
1814 case TARGET_PROT_DOUT_INSERT:
1815 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1816 sbc_dif_generate(cmd);
1818 case TARGET_PROT_DOUT_STRIP:
1819 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1822 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
1823 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1824 sectors, 0, cmd->t_prot_sg, 0);
1825 if (unlikely(cmd->pi_err)) {
1826 spin_lock_irq(&cmd->t_state_lock);
1827 cmd->transport_state &= ~CMD_T_SENT;
1828 spin_unlock_irq(&cmd->t_state_lock);
1829 transport_generic_request_failure(cmd, cmd->pi_err);
1840 static bool target_handle_task_attr(struct se_cmd *cmd)
1842 struct se_device *dev = cmd->se_dev;
1844 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1847 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1850 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1851 * to allow the passed struct se_cmd list of tasks to the front of the list.
1853 switch (cmd->sam_task_attr) {
1855 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1856 cmd->t_task_cdb[0]);
1858 case TCM_ORDERED_TAG:
1859 atomic_inc_mb(&dev->dev_ordered_sync);
1861 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1862 cmd->t_task_cdb[0]);
1865 * Execute an ORDERED command if no other older commands
1866 * exist that need to be completed first.
1868 if (!atomic_read(&dev->simple_cmds))
1873 * For SIMPLE and UNTAGGED Task Attribute commands
1875 atomic_inc_mb(&dev->simple_cmds);
1879 if (atomic_read(&dev->dev_ordered_sync) == 0)
1882 spin_lock(&dev->delayed_cmd_lock);
1883 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1884 spin_unlock(&dev->delayed_cmd_lock);
1886 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1887 cmd->t_task_cdb[0], cmd->sam_task_attr);
1891 static int __transport_check_aborted_status(struct se_cmd *, int);
1893 void target_execute_cmd(struct se_cmd *cmd)
1896 * Determine if frontend context caller is requesting the stopping of
1897 * this command for frontend exceptions.
1899 * If the received CDB has aleady been aborted stop processing it here.
1901 spin_lock_irq(&cmd->t_state_lock);
1902 if (__transport_check_aborted_status(cmd, 1)) {
1903 spin_unlock_irq(&cmd->t_state_lock);
1906 if (cmd->transport_state & CMD_T_STOP) {
1907 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1908 __func__, __LINE__, cmd->tag);
1910 spin_unlock_irq(&cmd->t_state_lock);
1911 complete_all(&cmd->t_transport_stop_comp);
1915 cmd->t_state = TRANSPORT_PROCESSING;
1916 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
1917 spin_unlock_irq(&cmd->t_state_lock);
1919 if (target_write_prot_action(cmd))
1922 if (target_handle_task_attr(cmd)) {
1923 spin_lock_irq(&cmd->t_state_lock);
1924 cmd->transport_state &= ~CMD_T_SENT;
1925 spin_unlock_irq(&cmd->t_state_lock);
1929 __target_execute_cmd(cmd, true);
1931 EXPORT_SYMBOL(target_execute_cmd);
1934 * Process all commands up to the last received ORDERED task attribute which
1935 * requires another blocking boundary
1937 static void target_restart_delayed_cmds(struct se_device *dev)
1942 spin_lock(&dev->delayed_cmd_lock);
1943 if (list_empty(&dev->delayed_cmd_list)) {
1944 spin_unlock(&dev->delayed_cmd_lock);
1948 cmd = list_entry(dev->delayed_cmd_list.next,
1949 struct se_cmd, se_delayed_node);
1950 list_del(&cmd->se_delayed_node);
1951 spin_unlock(&dev->delayed_cmd_lock);
1953 __target_execute_cmd(cmd, true);
1955 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
1961 * Called from I/O completion to determine which dormant/delayed
1962 * and ordered cmds need to have their tasks added to the execution queue.
1964 static void transport_complete_task_attr(struct se_cmd *cmd)
1966 struct se_device *dev = cmd->se_dev;
1968 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1971 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
1974 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
1975 atomic_dec_mb(&dev->simple_cmds);
1976 dev->dev_cur_ordered_id++;
1977 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
1978 dev->dev_cur_ordered_id++;
1979 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1980 dev->dev_cur_ordered_id);
1981 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
1982 atomic_dec_mb(&dev->dev_ordered_sync);
1984 dev->dev_cur_ordered_id++;
1985 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1986 dev->dev_cur_ordered_id);
1989 target_restart_delayed_cmds(dev);
1992 static void transport_complete_qf(struct se_cmd *cmd)
1996 transport_complete_task_attr(cmd);
1998 * If a fabric driver ->write_pending() or ->queue_data_in() callback
1999 * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and
2000 * the same callbacks should not be retried. Return CHECK_CONDITION
2001 * if a scsi_status is not already set.
2003 * If a fabric driver ->queue_status() has returned non zero, always
2004 * keep retrying no matter what..
2006 if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) {
2007 if (cmd->scsi_status)
2010 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2011 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2012 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2013 translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
2017 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
2020 switch (cmd->data_direction) {
2021 case DMA_FROM_DEVICE:
2022 if (cmd->scsi_status)
2025 trace_target_cmd_complete(cmd);
2026 ret = cmd->se_tfo->queue_data_in(cmd);
2029 if (cmd->se_cmd_flags & SCF_BIDI) {
2030 ret = cmd->se_tfo->queue_data_in(cmd);
2033 /* Fall through for DMA_TO_DEVICE */
2036 trace_target_cmd_complete(cmd);
2037 ret = cmd->se_tfo->queue_status(cmd);
2044 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
2047 transport_lun_remove_cmd(cmd);
2048 transport_cmd_check_stop_to_fabric(cmd);
2051 static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev,
2052 int err, bool write_pending)
2055 * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or
2056 * ->queue_data_in() callbacks from new process context.
2058 * Otherwise for other errors, transport_complete_qf() will send
2059 * CHECK_CONDITION via ->queue_status() instead of attempting to
2060 * retry associated fabric driver data-transfer callbacks.
2062 if (err == -EAGAIN || err == -ENOMEM) {
2063 cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP :
2064 TRANSPORT_COMPLETE_QF_OK;
2066 pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err);
2067 cmd->t_state = TRANSPORT_COMPLETE_QF_ERR;
2070 spin_lock_irq(&dev->qf_cmd_lock);
2071 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2072 atomic_inc_mb(&dev->dev_qf_count);
2073 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2075 schedule_work(&cmd->se_dev->qf_work_queue);
2078 static bool target_read_prot_action(struct se_cmd *cmd)
2080 switch (cmd->prot_op) {
2081 case TARGET_PROT_DIN_STRIP:
2082 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
2083 u32 sectors = cmd->data_length >>
2084 ilog2(cmd->se_dev->dev_attrib.block_size);
2086 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2087 sectors, 0, cmd->t_prot_sg,
2093 case TARGET_PROT_DIN_INSERT:
2094 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2097 sbc_dif_generate(cmd);
2106 static void target_complete_ok_work(struct work_struct *work)
2108 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2112 * Check if we need to move delayed/dormant tasks from cmds on the
2113 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2116 transport_complete_task_attr(cmd);
2119 * Check to schedule QUEUE_FULL work, or execute an existing
2120 * cmd->transport_qf_callback()
2122 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2123 schedule_work(&cmd->se_dev->qf_work_queue);
2126 * Check if we need to send a sense buffer from
2127 * the struct se_cmd in question.
2129 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2130 WARN_ON(!cmd->scsi_status);
2131 ret = transport_send_check_condition_and_sense(
2136 transport_lun_remove_cmd(cmd);
2137 transport_cmd_check_stop_to_fabric(cmd);
2141 * Check for a callback, used by amongst other things
2142 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
2144 if (cmd->transport_complete_callback) {
2146 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2147 bool zero_dl = !(cmd->data_length);
2150 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2151 if (!rc && !post_ret) {
2157 ret = transport_send_check_condition_and_sense(cmd,
2162 transport_lun_remove_cmd(cmd);
2163 transport_cmd_check_stop_to_fabric(cmd);
2169 switch (cmd->data_direction) {
2170 case DMA_FROM_DEVICE:
2171 if (cmd->scsi_status)
2174 atomic_long_add(cmd->data_length,
2175 &cmd->se_lun->lun_stats.tx_data_octets);
2177 * Perform READ_STRIP of PI using software emulation when
2178 * backend had PI enabled, if the transport will not be
2179 * performing hardware READ_STRIP offload.
2181 if (target_read_prot_action(cmd)) {
2182 ret = transport_send_check_condition_and_sense(cmd,
2187 transport_lun_remove_cmd(cmd);
2188 transport_cmd_check_stop_to_fabric(cmd);
2192 trace_target_cmd_complete(cmd);
2193 ret = cmd->se_tfo->queue_data_in(cmd);
2198 atomic_long_add(cmd->data_length,
2199 &cmd->se_lun->lun_stats.rx_data_octets);
2201 * Check if we need to send READ payload for BIDI-COMMAND
2203 if (cmd->se_cmd_flags & SCF_BIDI) {
2204 atomic_long_add(cmd->data_length,
2205 &cmd->se_lun->lun_stats.tx_data_octets);
2206 ret = cmd->se_tfo->queue_data_in(cmd);
2211 /* Fall through for DMA_TO_DEVICE */
2214 trace_target_cmd_complete(cmd);
2215 ret = cmd->se_tfo->queue_status(cmd);
2223 transport_lun_remove_cmd(cmd);
2224 transport_cmd_check_stop_to_fabric(cmd);
2228 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2229 " data_direction: %d\n", cmd, cmd->data_direction);
2231 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
2234 void target_free_sgl(struct scatterlist *sgl, int nents)
2236 struct scatterlist *sg;
2239 for_each_sg(sgl, sg, nents, count)
2240 __free_page(sg_page(sg));
2244 EXPORT_SYMBOL(target_free_sgl);
2246 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2249 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2250 * emulation, and free + reset pointers if necessary..
2252 if (!cmd->t_data_sg_orig)
2255 kfree(cmd->t_data_sg);
2256 cmd->t_data_sg = cmd->t_data_sg_orig;
2257 cmd->t_data_sg_orig = NULL;
2258 cmd->t_data_nents = cmd->t_data_nents_orig;
2259 cmd->t_data_nents_orig = 0;
2262 static inline void transport_free_pages(struct se_cmd *cmd)
2264 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2265 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2266 cmd->t_prot_sg = NULL;
2267 cmd->t_prot_nents = 0;
2270 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2272 * Release special case READ buffer payload required for
2273 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2275 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2276 target_free_sgl(cmd->t_bidi_data_sg,
2277 cmd->t_bidi_data_nents);
2278 cmd->t_bidi_data_sg = NULL;
2279 cmd->t_bidi_data_nents = 0;
2281 transport_reset_sgl_orig(cmd);
2284 transport_reset_sgl_orig(cmd);
2286 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2287 cmd->t_data_sg = NULL;
2288 cmd->t_data_nents = 0;
2290 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2291 cmd->t_bidi_data_sg = NULL;
2292 cmd->t_bidi_data_nents = 0;
2296 * transport_put_cmd - release a reference to a command
2297 * @cmd: command to release
2299 * This routine releases our reference to the command and frees it if possible.
2301 static int transport_put_cmd(struct se_cmd *cmd)
2303 BUG_ON(!cmd->se_tfo);
2305 * If this cmd has been setup with target_get_sess_cmd(), drop
2306 * the kref and call ->release_cmd() in kref callback.
2308 return target_put_sess_cmd(cmd);
2311 void *transport_kmap_data_sg(struct se_cmd *cmd)
2313 struct scatterlist *sg = cmd->t_data_sg;
2314 struct page **pages;
2318 * We need to take into account a possible offset here for fabrics like
2319 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2320 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2322 if (!cmd->t_data_nents)
2326 if (cmd->t_data_nents == 1)
2327 return kmap(sg_page(sg)) + sg->offset;
2329 /* >1 page. use vmap */
2330 pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL);
2334 /* convert sg[] to pages[] */
2335 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2336 pages[i] = sg_page(sg);
2339 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2341 if (!cmd->t_data_vmap)
2344 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2346 EXPORT_SYMBOL(transport_kmap_data_sg);
2348 void transport_kunmap_data_sg(struct se_cmd *cmd)
2350 if (!cmd->t_data_nents) {
2352 } else if (cmd->t_data_nents == 1) {
2353 kunmap(sg_page(cmd->t_data_sg));
2357 vunmap(cmd->t_data_vmap);
2358 cmd->t_data_vmap = NULL;
2360 EXPORT_SYMBOL(transport_kunmap_data_sg);
2363 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2364 bool zero_page, bool chainable)
2366 struct scatterlist *sg;
2368 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2369 unsigned int nalloc, nent;
2372 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2375 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
2379 sg_init_table(sg, nalloc);
2382 u32 page_len = min_t(u32, length, PAGE_SIZE);
2383 page = alloc_page(GFP_KERNEL | zero_flag);
2387 sg_set_page(&sg[i], page, page_len, 0);
2398 __free_page(sg_page(&sg[i]));
2403 EXPORT_SYMBOL(target_alloc_sgl);
2406 * Allocate any required resources to execute the command. For writes we
2407 * might not have the payload yet, so notify the fabric via a call to
2408 * ->write_pending instead. Otherwise place it on the execution queue.
2411 transport_generic_new_cmd(struct se_cmd *cmd)
2413 unsigned long flags;
2415 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2417 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2418 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2419 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2420 cmd->prot_length, true, false);
2422 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2426 * Determine is the TCM fabric module has already allocated physical
2427 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2430 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2433 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2434 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2437 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2438 bidi_length = cmd->t_task_nolb *
2439 cmd->se_dev->dev_attrib.block_size;
2441 bidi_length = cmd->data_length;
2443 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2444 &cmd->t_bidi_data_nents,
2445 bidi_length, zero_flag, false);
2447 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2450 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2451 cmd->data_length, zero_flag, false);
2453 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2454 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2457 * Special case for COMPARE_AND_WRITE with fabrics
2458 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2460 u32 caw_length = cmd->t_task_nolb *
2461 cmd->se_dev->dev_attrib.block_size;
2463 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2464 &cmd->t_bidi_data_nents,
2465 caw_length, zero_flag, false);
2467 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2470 * If this command is not a write we can execute it right here,
2471 * for write buffers we need to notify the fabric driver first
2472 * and let it call back once the write buffers are ready.
2474 target_add_to_state_list(cmd);
2475 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
2476 target_execute_cmd(cmd);
2480 spin_lock_irqsave(&cmd->t_state_lock, flags);
2481 cmd->t_state = TRANSPORT_WRITE_PENDING;
2483 * Determine if frontend context caller is requesting the stopping of
2484 * this command for frontend exceptions.
2486 if (cmd->transport_state & CMD_T_STOP) {
2487 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
2488 __func__, __LINE__, cmd->tag);
2490 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2492 complete_all(&cmd->t_transport_stop_comp);
2495 cmd->transport_state &= ~CMD_T_ACTIVE;
2496 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2498 ret = cmd->se_tfo->write_pending(cmd);
2505 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2506 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
2509 EXPORT_SYMBOL(transport_generic_new_cmd);
2511 static void transport_write_pending_qf(struct se_cmd *cmd)
2515 ret = cmd->se_tfo->write_pending(cmd);
2517 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2519 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
2524 __transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2525 unsigned long *flags);
2527 static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2529 unsigned long flags;
2531 spin_lock_irqsave(&cmd->t_state_lock, flags);
2532 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2533 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2536 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2539 bool aborted = false, tas = false;
2541 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2542 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2543 target_wait_free_cmd(cmd, &aborted, &tas);
2545 if (!aborted || tas)
2546 ret = transport_put_cmd(cmd);
2549 target_wait_free_cmd(cmd, &aborted, &tas);
2551 * Handle WRITE failure case where transport_generic_new_cmd()
2552 * has already added se_cmd to state_list, but fabric has
2553 * failed command before I/O submission.
2555 if (cmd->state_active)
2556 target_remove_from_state_list(cmd);
2559 transport_lun_remove_cmd(cmd);
2561 if (!aborted || tas)
2562 ret = transport_put_cmd(cmd);
2565 * If the task has been internally aborted due to TMR ABORT_TASK
2566 * or LUN_RESET, target_core_tmr.c is responsible for performing
2567 * the remaining calls to target_put_sess_cmd(), and not the
2568 * callers of this function.
2571 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2572 wait_for_completion(&cmd->cmd_wait_comp);
2573 cmd->se_tfo->release_cmd(cmd);
2578 EXPORT_SYMBOL(transport_generic_free_cmd);
2580 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2581 * @se_cmd: command descriptor to add
2582 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2584 int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
2586 struct se_session *se_sess = se_cmd->se_sess;
2587 unsigned long flags;
2591 * Add a second kref if the fabric caller is expecting to handle
2592 * fabric acknowledgement that requires two target_put_sess_cmd()
2593 * invocations before se_cmd descriptor release.
2596 if (!kref_get_unless_zero(&se_cmd->cmd_kref))
2599 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2602 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2603 if (se_sess->sess_tearing_down) {
2607 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2609 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2611 if (ret && ack_kref)
2612 target_put_sess_cmd(se_cmd);
2616 EXPORT_SYMBOL(target_get_sess_cmd);
2618 static void target_free_cmd_mem(struct se_cmd *cmd)
2620 transport_free_pages(cmd);
2622 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2623 core_tmr_release_req(cmd->se_tmr_req);
2624 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2625 kfree(cmd->t_task_cdb);
2628 static void target_release_cmd_kref(struct kref *kref)
2630 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2631 struct se_session *se_sess = se_cmd->se_sess;
2632 unsigned long flags;
2636 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2638 spin_lock(&se_cmd->t_state_lock);
2639 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2640 (se_cmd->transport_state & CMD_T_ABORTED);
2641 spin_unlock(&se_cmd->t_state_lock);
2643 if (se_cmd->cmd_wait_set || fabric_stop) {
2644 list_del_init(&se_cmd->se_cmd_list);
2645 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2646 target_free_cmd_mem(se_cmd);
2647 complete(&se_cmd->cmd_wait_comp);
2650 list_del_init(&se_cmd->se_cmd_list);
2651 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2654 target_free_cmd_mem(se_cmd);
2655 se_cmd->se_tfo->release_cmd(se_cmd);
2659 * target_put_sess_cmd - decrease the command reference count
2660 * @se_cmd: command to drop a reference from
2662 * Returns 1 if and only if this target_put_sess_cmd() call caused the
2663 * refcount to drop to zero. Returns zero otherwise.
2665 int target_put_sess_cmd(struct se_cmd *se_cmd)
2667 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2669 EXPORT_SYMBOL(target_put_sess_cmd);
2671 /* target_sess_cmd_list_set_waiting - Flag all commands in
2672 * sess_cmd_list to complete cmd_wait_comp. Set
2673 * sess_tearing_down so no more commands are queued.
2674 * @se_sess: session to flag
2676 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2678 struct se_cmd *se_cmd, *tmp_cmd;
2679 unsigned long flags;
2682 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2683 if (se_sess->sess_tearing_down) {
2684 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2687 se_sess->sess_tearing_down = 1;
2688 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2690 list_for_each_entry_safe(se_cmd, tmp_cmd,
2691 &se_sess->sess_wait_list, se_cmd_list) {
2692 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2694 se_cmd->cmd_wait_set = 1;
2695 spin_lock(&se_cmd->t_state_lock);
2696 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2697 spin_unlock(&se_cmd->t_state_lock);
2699 list_del_init(&se_cmd->se_cmd_list);
2702 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2704 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2706 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2707 * @se_sess: session to wait for active I/O
2709 void target_wait_for_sess_cmds(struct se_session *se_sess)
2711 struct se_cmd *se_cmd, *tmp_cmd;
2712 unsigned long flags;
2715 list_for_each_entry_safe(se_cmd, tmp_cmd,
2716 &se_sess->sess_wait_list, se_cmd_list) {
2717 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2718 " %d\n", se_cmd, se_cmd->t_state,
2719 se_cmd->se_tfo->get_cmd_state(se_cmd));
2721 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2722 tas = (se_cmd->transport_state & CMD_T_TAS);
2723 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2725 if (!target_put_sess_cmd(se_cmd)) {
2727 target_put_sess_cmd(se_cmd);
2730 wait_for_completion(&se_cmd->cmd_wait_comp);
2731 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2732 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2733 se_cmd->se_tfo->get_cmd_state(se_cmd));
2735 se_cmd->se_tfo->release_cmd(se_cmd);
2738 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2739 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2740 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2743 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2745 static void target_lun_confirm(struct percpu_ref *ref)
2747 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
2749 complete(&lun->lun_ref_comp);
2752 void transport_clear_lun_ref(struct se_lun *lun)
2755 * Mark the percpu-ref as DEAD, switch to atomic_t mode, drop
2756 * the initial reference and schedule confirm kill to be
2757 * executed after one full RCU grace period has completed.
2759 percpu_ref_kill_and_confirm(&lun->lun_ref, target_lun_confirm);
2761 * The first completion waits for percpu_ref_switch_to_atomic_rcu()
2762 * to call target_lun_confirm after lun->lun_ref has been marked
2763 * as __PERCPU_REF_DEAD on all CPUs, and switches to atomic_t
2764 * mode so that percpu_ref_tryget_live() lookup of lun->lun_ref
2765 * fails for all new incoming I/O.
2767 wait_for_completion(&lun->lun_ref_comp);
2769 * The second completion waits for percpu_ref_put_many() to
2770 * invoke ->release() after lun->lun_ref has switched to
2771 * atomic_t mode, and lun->lun_ref.count has reached zero.
2773 * At this point all target-core lun->lun_ref references have
2774 * been dropped via transport_lun_remove_cmd(), and it's safe
2775 * to proceed with the remaining LUN shutdown.
2777 wait_for_completion(&lun->lun_shutdown_comp);
2781 __transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2782 bool *aborted, bool *tas, unsigned long *flags)
2783 __releases(&cmd->t_state_lock)
2784 __acquires(&cmd->t_state_lock)
2787 assert_spin_locked(&cmd->t_state_lock);
2788 WARN_ON_ONCE(!irqs_disabled());
2791 cmd->transport_state |= CMD_T_FABRIC_STOP;
2793 if (cmd->transport_state & CMD_T_ABORTED)
2796 if (cmd->transport_state & CMD_T_TAS)
2799 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2800 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2803 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2804 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2807 if (!(cmd->transport_state & CMD_T_ACTIVE))
2810 if (fabric_stop && *aborted)
2813 cmd->transport_state |= CMD_T_STOP;
2815 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2816 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2817 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2819 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
2821 wait_for_completion(&cmd->t_transport_stop_comp);
2823 spin_lock_irqsave(&cmd->t_state_lock, *flags);
2824 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2826 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2827 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
2833 * transport_wait_for_tasks - set CMD_T_STOP and wait for t_transport_stop_comp
2834 * @cmd: command to wait on
2836 bool transport_wait_for_tasks(struct se_cmd *cmd)
2838 unsigned long flags;
2839 bool ret, aborted = false, tas = false;
2841 spin_lock_irqsave(&cmd->t_state_lock, flags);
2842 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
2843 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2847 EXPORT_SYMBOL(transport_wait_for_tasks);
2853 bool add_sector_info;
2856 static const struct sense_info sense_info_table[] = {
2860 [TCM_NON_EXISTENT_LUN] = {
2861 .key = ILLEGAL_REQUEST,
2862 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2864 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2865 .key = ILLEGAL_REQUEST,
2866 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2868 [TCM_SECTOR_COUNT_TOO_MANY] = {
2869 .key = ILLEGAL_REQUEST,
2870 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2872 [TCM_UNKNOWN_MODE_PAGE] = {
2873 .key = ILLEGAL_REQUEST,
2874 .asc = 0x24, /* INVALID FIELD IN CDB */
2876 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2877 .key = ABORTED_COMMAND,
2878 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2881 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2882 .key = ABORTED_COMMAND,
2883 .asc = 0x0c, /* WRITE ERROR */
2884 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2886 [TCM_INVALID_CDB_FIELD] = {
2887 .key = ILLEGAL_REQUEST,
2888 .asc = 0x24, /* INVALID FIELD IN CDB */
2890 [TCM_INVALID_PARAMETER_LIST] = {
2891 .key = ILLEGAL_REQUEST,
2892 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2894 [TCM_TOO_MANY_TARGET_DESCS] = {
2895 .key = ILLEGAL_REQUEST,
2897 .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */
2899 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = {
2900 .key = ILLEGAL_REQUEST,
2902 .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */
2904 [TCM_TOO_MANY_SEGMENT_DESCS] = {
2905 .key = ILLEGAL_REQUEST,
2907 .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */
2909 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = {
2910 .key = ILLEGAL_REQUEST,
2912 .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */
2914 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2915 .key = ILLEGAL_REQUEST,
2916 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2918 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2919 .key = ILLEGAL_REQUEST,
2920 .asc = 0x0c, /* WRITE ERROR */
2921 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2923 [TCM_SERVICE_CRC_ERROR] = {
2924 .key = ABORTED_COMMAND,
2925 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2926 .ascq = 0x05, /* N/A */
2928 [TCM_SNACK_REJECTED] = {
2929 .key = ABORTED_COMMAND,
2930 .asc = 0x11, /* READ ERROR */
2931 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2933 [TCM_WRITE_PROTECTED] = {
2934 .key = DATA_PROTECT,
2935 .asc = 0x27, /* WRITE PROTECTED */
2937 [TCM_ADDRESS_OUT_OF_RANGE] = {
2938 .key = ILLEGAL_REQUEST,
2939 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2941 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2942 .key = UNIT_ATTENTION,
2944 [TCM_CHECK_CONDITION_NOT_READY] = {
2947 [TCM_MISCOMPARE_VERIFY] = {
2949 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2952 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
2953 .key = ABORTED_COMMAND,
2955 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2956 .add_sector_info = true,
2958 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
2959 .key = ABORTED_COMMAND,
2961 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2962 .add_sector_info = true,
2964 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
2965 .key = ABORTED_COMMAND,
2967 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2968 .add_sector_info = true,
2970 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
2971 .key = COPY_ABORTED,
2973 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
2976 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2978 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2979 * Solaris initiators. Returning NOT READY instead means the
2980 * operations will be retried a finite number of times and we
2981 * can survive intermittent errors.
2984 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2988 static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
2990 const struct sense_info *si;
2991 u8 *buffer = cmd->sense_buffer;
2992 int r = (__force int)reason;
2994 bool desc_format = target_sense_desc_format(cmd->se_dev);
2996 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2997 si = &sense_info_table[r];
2999 si = &sense_info_table[(__force int)
3000 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
3002 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
3003 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3004 WARN_ON_ONCE(asc == 0);
3005 } else if (si->asc == 0) {
3006 WARN_ON_ONCE(cmd->scsi_asc == 0);
3007 asc = cmd->scsi_asc;
3008 ascq = cmd->scsi_ascq;
3014 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
3015 if (si->add_sector_info)
3016 return scsi_set_sense_information(buffer,
3017 cmd->scsi_sense_length,
3024 transport_send_check_condition_and_sense(struct se_cmd *cmd,
3025 sense_reason_t reason, int from_transport)
3027 unsigned long flags;
3029 spin_lock_irqsave(&cmd->t_state_lock, flags);
3030 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3031 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3034 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
3035 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3037 if (!from_transport) {
3040 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
3041 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3042 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
3043 rc = translate_sense_reason(cmd, reason);
3048 trace_target_cmd_complete(cmd);
3049 return cmd->se_tfo->queue_status(cmd);
3051 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3053 static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3054 __releases(&cmd->t_state_lock)
3055 __acquires(&cmd->t_state_lock)
3059 assert_spin_locked(&cmd->t_state_lock);
3060 WARN_ON_ONCE(!irqs_disabled());
3062 if (!(cmd->transport_state & CMD_T_ABORTED))
3065 * If cmd has been aborted but either no status is to be sent or it has
3066 * already been sent, just return
3068 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
3070 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
3074 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
3075 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
3077 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
3078 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3079 trace_target_cmd_complete(cmd);
3081 spin_unlock_irq(&cmd->t_state_lock);
3082 ret = cmd->se_tfo->queue_status(cmd);
3084 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
3085 spin_lock_irq(&cmd->t_state_lock);
3090 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3094 spin_lock_irq(&cmd->t_state_lock);
3095 ret = __transport_check_aborted_status(cmd, send_status);
3096 spin_unlock_irq(&cmd->t_state_lock);
3100 EXPORT_SYMBOL(transport_check_aborted_status);
3102 void transport_send_task_abort(struct se_cmd *cmd)
3104 unsigned long flags;
3107 spin_lock_irqsave(&cmd->t_state_lock, flags);
3108 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
3109 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3112 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3115 * If there are still expected incoming fabric WRITEs, we wait
3116 * until until they have completed before sending a TASK_ABORTED
3117 * response. This response with TASK_ABORTED status will be
3118 * queued back to fabric module by transport_check_aborted_status().
3120 if (cmd->data_direction == DMA_TO_DEVICE) {
3121 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3122 spin_lock_irqsave(&cmd->t_state_lock, flags);
3123 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3124 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3127 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
3128 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3133 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3135 transport_lun_remove_cmd(cmd);
3137 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3138 cmd->t_task_cdb[0], cmd->tag);
3140 trace_target_cmd_complete(cmd);
3141 ret = cmd->se_tfo->queue_status(cmd);
3143 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
3146 static void target_tmr_work(struct work_struct *work)
3148 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3149 struct se_device *dev = cmd->se_dev;
3150 struct se_tmr_req *tmr = cmd->se_tmr_req;
3151 unsigned long flags;
3154 spin_lock_irqsave(&cmd->t_state_lock, flags);
3155 if (cmd->transport_state & CMD_T_ABORTED) {
3156 tmr->response = TMR_FUNCTION_REJECTED;
3157 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3160 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3162 switch (tmr->function) {
3163 case TMR_ABORT_TASK:
3164 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3166 case TMR_ABORT_TASK_SET:
3168 case TMR_CLEAR_TASK_SET:
3169 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3172 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3173 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3174 TMR_FUNCTION_REJECTED;
3175 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3176 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3177 cmd->orig_fe_lun, 0x29,
3178 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3181 case TMR_TARGET_WARM_RESET:
3182 tmr->response = TMR_FUNCTION_REJECTED;
3184 case TMR_TARGET_COLD_RESET:
3185 tmr->response = TMR_FUNCTION_REJECTED;
3188 pr_err("Uknown TMR function: 0x%02x.\n",
3190 tmr->response = TMR_FUNCTION_REJECTED;
3194 spin_lock_irqsave(&cmd->t_state_lock, flags);
3195 if (cmd->transport_state & CMD_T_ABORTED) {
3196 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3199 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3201 cmd->se_tfo->queue_tm_rsp(cmd);
3204 transport_cmd_check_stop_to_fabric(cmd);
3207 int transport_generic_handle_tmr(
3210 unsigned long flags;
3211 bool aborted = false;
3213 spin_lock_irqsave(&cmd->t_state_lock, flags);
3214 if (cmd->transport_state & CMD_T_ABORTED) {
3217 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3218 cmd->transport_state |= CMD_T_ACTIVE;
3220 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3223 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
3224 "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
3225 cmd->se_tmr_req->ref_task_tag, cmd->tag);
3226 transport_cmd_check_stop_to_fabric(cmd);
3230 INIT_WORK(&cmd->work, target_tmr_work);
3231 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3234 EXPORT_SYMBOL(transport_generic_handle_tmr);
3237 target_check_wce(struct se_device *dev)
3241 if (dev->transport->get_write_cache)
3242 wce = dev->transport->get_write_cache(dev);
3243 else if (dev->dev_attrib.emulate_write_cache > 0)
3250 target_check_fua(struct se_device *dev)
3252 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;