1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * (c) Copyright 2002-2012 RisingTide Systems LLC.
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/blkdev.h>
32 #include <linux/spinlock.h>
33 #include <linux/kthread.h>
35 #include <linux/cdrom.h>
36 #include <linux/module.h>
37 #include <linux/ratelimit.h>
38 #include <asm/unaligned.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_cmnd.h>
43 #include <scsi/scsi_tcq.h>
45 #include <target/target_core_base.h>
46 #include <target/target_core_backend.h>
47 #include <target/target_core_fabric.h>
48 #include <target/target_core_configfs.h>
50 #include "target_core_internal.h"
51 #include "target_core_alua.h"
52 #include "target_core_pr.h"
53 #include "target_core_ua.h"
55 static struct workqueue_struct
*target_completion_wq
;
56 static struct kmem_cache
*se_sess_cache
;
57 struct kmem_cache
*se_ua_cache
;
58 struct kmem_cache
*t10_pr_reg_cache
;
59 struct kmem_cache
*t10_alua_lu_gp_cache
;
60 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
61 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
62 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
64 static void transport_complete_task_attr(struct se_cmd
*cmd
);
65 static void transport_handle_queue_full(struct se_cmd
*cmd
,
66 struct se_device
*dev
);
67 static int transport_generic_get_mem(struct se_cmd
*cmd
);
68 static int transport_put_cmd(struct se_cmd
*cmd
);
69 static void target_complete_ok_work(struct work_struct
*work
);
71 int init_se_kmem_caches(void)
73 se_sess_cache
= kmem_cache_create("se_sess_cache",
74 sizeof(struct se_session
), __alignof__(struct se_session
),
77 pr_err("kmem_cache_create() for struct se_session"
81 se_ua_cache
= kmem_cache_create("se_ua_cache",
82 sizeof(struct se_ua
), __alignof__(struct se_ua
),
85 pr_err("kmem_cache_create() for struct se_ua failed\n");
86 goto out_free_sess_cache
;
88 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
89 sizeof(struct t10_pr_registration
),
90 __alignof__(struct t10_pr_registration
), 0, NULL
);
91 if (!t10_pr_reg_cache
) {
92 pr_err("kmem_cache_create() for struct t10_pr_registration"
94 goto out_free_ua_cache
;
96 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
97 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
99 if (!t10_alua_lu_gp_cache
) {
100 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
102 goto out_free_pr_reg_cache
;
104 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
105 sizeof(struct t10_alua_lu_gp_member
),
106 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
107 if (!t10_alua_lu_gp_mem_cache
) {
108 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
110 goto out_free_lu_gp_cache
;
112 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
113 sizeof(struct t10_alua_tg_pt_gp
),
114 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
115 if (!t10_alua_tg_pt_gp_cache
) {
116 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
118 goto out_free_lu_gp_mem_cache
;
120 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
121 "t10_alua_tg_pt_gp_mem_cache",
122 sizeof(struct t10_alua_tg_pt_gp_member
),
123 __alignof__(struct t10_alua_tg_pt_gp_member
),
125 if (!t10_alua_tg_pt_gp_mem_cache
) {
126 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
128 goto out_free_tg_pt_gp_cache
;
131 target_completion_wq
= alloc_workqueue("target_completion",
133 if (!target_completion_wq
)
134 goto out_free_tg_pt_gp_mem_cache
;
138 out_free_tg_pt_gp_mem_cache
:
139 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
140 out_free_tg_pt_gp_cache
:
141 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
142 out_free_lu_gp_mem_cache
:
143 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
144 out_free_lu_gp_cache
:
145 kmem_cache_destroy(t10_alua_lu_gp_cache
);
146 out_free_pr_reg_cache
:
147 kmem_cache_destroy(t10_pr_reg_cache
);
149 kmem_cache_destroy(se_ua_cache
);
151 kmem_cache_destroy(se_sess_cache
);
156 void release_se_kmem_caches(void)
158 destroy_workqueue(target_completion_wq
);
159 kmem_cache_destroy(se_sess_cache
);
160 kmem_cache_destroy(se_ua_cache
);
161 kmem_cache_destroy(t10_pr_reg_cache
);
162 kmem_cache_destroy(t10_alua_lu_gp_cache
);
163 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
164 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
165 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
168 /* This code ensures unique mib indexes are handed out. */
169 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
170 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
173 * Allocate a new row index for the entry type specified
175 u32
scsi_get_new_index(scsi_index_t type
)
179 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
181 spin_lock(&scsi_mib_index_lock
);
182 new_index
= ++scsi_mib_index
[type
];
183 spin_unlock(&scsi_mib_index_lock
);
188 void transport_subsystem_check_init(void)
191 static int sub_api_initialized
;
193 if (sub_api_initialized
)
196 ret
= request_module("target_core_iblock");
198 pr_err("Unable to load target_core_iblock\n");
200 ret
= request_module("target_core_file");
202 pr_err("Unable to load target_core_file\n");
204 ret
= request_module("target_core_pscsi");
206 pr_err("Unable to load target_core_pscsi\n");
208 sub_api_initialized
= 1;
211 struct se_session
*transport_init_session(void)
213 struct se_session
*se_sess
;
215 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
217 pr_err("Unable to allocate struct se_session from"
219 return ERR_PTR(-ENOMEM
);
221 INIT_LIST_HEAD(&se_sess
->sess_list
);
222 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
223 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
224 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
225 spin_lock_init(&se_sess
->sess_cmd_lock
);
226 kref_init(&se_sess
->sess_kref
);
230 EXPORT_SYMBOL(transport_init_session
);
233 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
235 void __transport_register_session(
236 struct se_portal_group
*se_tpg
,
237 struct se_node_acl
*se_nacl
,
238 struct se_session
*se_sess
,
239 void *fabric_sess_ptr
)
241 unsigned char buf
[PR_REG_ISID_LEN
];
243 se_sess
->se_tpg
= se_tpg
;
244 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
246 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
248 * Only set for struct se_session's that will actually be moving I/O.
249 * eg: *NOT* discovery sessions.
253 * If the fabric module supports an ISID based TransportID,
254 * save this value in binary from the fabric I_T Nexus now.
256 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
257 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
258 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
259 &buf
[0], PR_REG_ISID_LEN
);
260 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
262 kref_get(&se_nacl
->acl_kref
);
264 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
266 * The se_nacl->nacl_sess pointer will be set to the
267 * last active I_T Nexus for each struct se_node_acl.
269 se_nacl
->nacl_sess
= se_sess
;
271 list_add_tail(&se_sess
->sess_acl_list
,
272 &se_nacl
->acl_sess_list
);
273 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
275 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
277 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
278 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
280 EXPORT_SYMBOL(__transport_register_session
);
282 void transport_register_session(
283 struct se_portal_group
*se_tpg
,
284 struct se_node_acl
*se_nacl
,
285 struct se_session
*se_sess
,
286 void *fabric_sess_ptr
)
290 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
291 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
292 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
294 EXPORT_SYMBOL(transport_register_session
);
296 static void target_release_session(struct kref
*kref
)
298 struct se_session
*se_sess
= container_of(kref
,
299 struct se_session
, sess_kref
);
300 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
302 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
305 void target_get_session(struct se_session
*se_sess
)
307 kref_get(&se_sess
->sess_kref
);
309 EXPORT_SYMBOL(target_get_session
);
311 void target_put_session(struct se_session
*se_sess
)
313 struct se_portal_group
*tpg
= se_sess
->se_tpg
;
315 if (tpg
->se_tpg_tfo
->put_session
!= NULL
) {
316 tpg
->se_tpg_tfo
->put_session(se_sess
);
319 kref_put(&se_sess
->sess_kref
, target_release_session
);
321 EXPORT_SYMBOL(target_put_session
);
323 static void target_complete_nacl(struct kref
*kref
)
325 struct se_node_acl
*nacl
= container_of(kref
,
326 struct se_node_acl
, acl_kref
);
328 complete(&nacl
->acl_free_comp
);
331 void target_put_nacl(struct se_node_acl
*nacl
)
333 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
336 void transport_deregister_session_configfs(struct se_session
*se_sess
)
338 struct se_node_acl
*se_nacl
;
341 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
343 se_nacl
= se_sess
->se_node_acl
;
345 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
346 if (se_nacl
->acl_stop
== 0)
347 list_del(&se_sess
->sess_acl_list
);
349 * If the session list is empty, then clear the pointer.
350 * Otherwise, set the struct se_session pointer from the tail
351 * element of the per struct se_node_acl active session list.
353 if (list_empty(&se_nacl
->acl_sess_list
))
354 se_nacl
->nacl_sess
= NULL
;
356 se_nacl
->nacl_sess
= container_of(
357 se_nacl
->acl_sess_list
.prev
,
358 struct se_session
, sess_acl_list
);
360 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
363 EXPORT_SYMBOL(transport_deregister_session_configfs
);
365 void transport_free_session(struct se_session
*se_sess
)
367 kmem_cache_free(se_sess_cache
, se_sess
);
369 EXPORT_SYMBOL(transport_free_session
);
371 void transport_deregister_session(struct se_session
*se_sess
)
373 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
374 struct target_core_fabric_ops
*se_tfo
;
375 struct se_node_acl
*se_nacl
;
377 bool comp_nacl
= true;
380 transport_free_session(se_sess
);
383 se_tfo
= se_tpg
->se_tpg_tfo
;
385 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
386 list_del(&se_sess
->sess_list
);
387 se_sess
->se_tpg
= NULL
;
388 se_sess
->fabric_sess_ptr
= NULL
;
389 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
392 * Determine if we need to do extra work for this initiator node's
393 * struct se_node_acl if it had been previously dynamically generated.
395 se_nacl
= se_sess
->se_node_acl
;
397 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
398 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
399 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
400 list_del(&se_nacl
->acl_list
);
401 se_tpg
->num_node_acls
--;
402 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
403 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
404 core_free_device_list_for_node(se_nacl
, se_tpg
);
405 se_tfo
->tpg_release_fabric_acl(se_tpg
, se_nacl
);
408 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
411 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
413 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
414 se_tpg
->se_tpg_tfo
->get_fabric_name());
416 * If last kref is dropping now for an explict NodeACL, awake sleeping
417 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
420 if (se_nacl
&& comp_nacl
== true)
421 target_put_nacl(se_nacl
);
423 transport_free_session(se_sess
);
425 EXPORT_SYMBOL(transport_deregister_session
);
428 * Called with cmd->t_state_lock held.
430 static void target_remove_from_state_list(struct se_cmd
*cmd
)
432 struct se_device
*dev
= cmd
->se_dev
;
438 if (cmd
->transport_state
& CMD_T_BUSY
)
441 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
442 if (cmd
->state_active
) {
443 list_del(&cmd
->state_list
);
444 cmd
->state_active
= false;
446 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
449 static int transport_cmd_check_stop(struct se_cmd
*cmd
, bool remove_from_lists
,
454 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
456 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
459 * Determine if IOCTL context caller in requesting the stopping of this
460 * command for LUN shutdown purposes.
462 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
463 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
464 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
466 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
467 if (remove_from_lists
)
468 target_remove_from_state_list(cmd
);
469 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
471 complete(&cmd
->transport_lun_stop_comp
);
475 if (remove_from_lists
) {
476 target_remove_from_state_list(cmd
);
479 * Clear struct se_cmd->se_lun before the handoff to FE.
485 * Determine if frontend context caller is requesting the stopping of
486 * this command for frontend exceptions.
488 if (cmd
->transport_state
& CMD_T_STOP
) {
489 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
491 cmd
->se_tfo
->get_task_tag(cmd
));
493 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
495 complete(&cmd
->t_transport_stop_comp
);
499 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
500 if (remove_from_lists
) {
502 * Some fabric modules like tcm_loop can release
503 * their internally allocated I/O reference now and
506 * Fabric modules are expected to return '1' here if the
507 * se_cmd being passed is released at this point,
508 * or zero if not being released.
510 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
511 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
512 return cmd
->se_tfo
->check_stop_free(cmd
);
516 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
520 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
522 return transport_cmd_check_stop(cmd
, true, false);
525 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
527 struct se_lun
*lun
= cmd
->se_lun
;
533 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
534 if (!list_empty(&cmd
->se_lun_node
))
535 list_del_init(&cmd
->se_lun_node
);
536 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
539 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
541 if (transport_cmd_check_stop_to_fabric(cmd
))
544 transport_put_cmd(cmd
);
547 static void target_complete_failure_work(struct work_struct
*work
)
549 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
551 transport_generic_request_failure(cmd
,
552 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
);
556 * Used when asking transport to copy Sense Data from the underlying
557 * Linux/SCSI struct scsi_cmnd
559 static unsigned char *transport_get_sense_buffer(struct se_cmd
*cmd
)
561 struct se_device
*dev
= cmd
->se_dev
;
563 WARN_ON(!cmd
->se_lun
);
568 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
)
571 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
573 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
574 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
575 return cmd
->sense_buffer
;
578 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
580 struct se_device
*dev
= cmd
->se_dev
;
581 int success
= scsi_status
== GOOD
;
584 cmd
->scsi_status
= scsi_status
;
587 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
588 cmd
->transport_state
&= ~CMD_T_BUSY
;
590 if (dev
&& dev
->transport
->transport_complete
) {
591 dev
->transport
->transport_complete(cmd
,
593 transport_get_sense_buffer(cmd
));
594 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
599 * See if we are waiting to complete for an exception condition.
601 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
602 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
603 complete(&cmd
->task_stop_comp
);
608 cmd
->transport_state
|= CMD_T_FAILED
;
611 * Check for case where an explict ABORT_TASK has been received
612 * and transport_wait_for_tasks() will be waiting for completion..
614 if (cmd
->transport_state
& CMD_T_ABORTED
&&
615 cmd
->transport_state
& CMD_T_STOP
) {
616 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
617 complete(&cmd
->t_transport_stop_comp
);
619 } else if (cmd
->transport_state
& CMD_T_FAILED
) {
620 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
622 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
625 cmd
->t_state
= TRANSPORT_COMPLETE
;
626 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
627 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
629 queue_work(target_completion_wq
, &cmd
->work
);
631 EXPORT_SYMBOL(target_complete_cmd
);
633 static void target_add_to_state_list(struct se_cmd
*cmd
)
635 struct se_device
*dev
= cmd
->se_dev
;
638 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
639 if (!cmd
->state_active
) {
640 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
641 cmd
->state_active
= true;
643 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
647 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
649 static void transport_write_pending_qf(struct se_cmd
*cmd
);
650 static void transport_complete_qf(struct se_cmd
*cmd
);
652 void target_qf_do_work(struct work_struct
*work
)
654 struct se_device
*dev
= container_of(work
, struct se_device
,
656 LIST_HEAD(qf_cmd_list
);
657 struct se_cmd
*cmd
, *cmd_tmp
;
659 spin_lock_irq(&dev
->qf_cmd_lock
);
660 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
661 spin_unlock_irq(&dev
->qf_cmd_lock
);
663 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
664 list_del(&cmd
->se_qf_node
);
665 atomic_dec(&dev
->dev_qf_count
);
666 smp_mb__after_atomic_dec();
668 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
669 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
670 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
671 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
674 if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
)
675 transport_write_pending_qf(cmd
);
676 else if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
)
677 transport_complete_qf(cmd
);
681 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
683 switch (cmd
->data_direction
) {
686 case DMA_FROM_DEVICE
:
690 case DMA_BIDIRECTIONAL
:
699 void transport_dump_dev_state(
700 struct se_device
*dev
,
704 *bl
+= sprintf(b
+ *bl
, "Status: ");
705 if (dev
->export_count
)
706 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
708 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
710 *bl
+= sprintf(b
+ *bl
, " Max Queue Depth: %d", dev
->queue_depth
);
711 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u HwMaxSectors: %u\n",
712 dev
->dev_attrib
.block_size
,
713 dev
->dev_attrib
.hw_max_sectors
);
714 *bl
+= sprintf(b
+ *bl
, " ");
717 void transport_dump_vpd_proto_id(
719 unsigned char *p_buf
,
722 unsigned char buf
[VPD_TMP_BUF_SIZE
];
725 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
726 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
728 switch (vpd
->protocol_identifier
) {
730 sprintf(buf
+len
, "Fibre Channel\n");
733 sprintf(buf
+len
, "Parallel SCSI\n");
736 sprintf(buf
+len
, "SSA\n");
739 sprintf(buf
+len
, "IEEE 1394\n");
742 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
746 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
749 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
752 sprintf(buf
+len
, "Automation/Drive Interface Transport"
756 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
759 sprintf(buf
+len
, "Unknown 0x%02x\n",
760 vpd
->protocol_identifier
);
765 strncpy(p_buf
, buf
, p_buf_len
);
771 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
774 * Check if the Protocol Identifier Valid (PIV) bit is set..
776 * from spc3r23.pdf section 7.5.1
778 if (page_83
[1] & 0x80) {
779 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
780 vpd
->protocol_identifier_set
= 1;
781 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
784 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
786 int transport_dump_vpd_assoc(
788 unsigned char *p_buf
,
791 unsigned char buf
[VPD_TMP_BUF_SIZE
];
795 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
796 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
798 switch (vpd
->association
) {
800 sprintf(buf
+len
, "addressed logical unit\n");
803 sprintf(buf
+len
, "target port\n");
806 sprintf(buf
+len
, "SCSI target device\n");
809 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
815 strncpy(p_buf
, buf
, p_buf_len
);
822 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
825 * The VPD identification association..
827 * from spc3r23.pdf Section 7.6.3.1 Table 297
829 vpd
->association
= (page_83
[1] & 0x30);
830 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
832 EXPORT_SYMBOL(transport_set_vpd_assoc
);
834 int transport_dump_vpd_ident_type(
836 unsigned char *p_buf
,
839 unsigned char buf
[VPD_TMP_BUF_SIZE
];
843 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
844 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
846 switch (vpd
->device_identifier_type
) {
848 sprintf(buf
+len
, "Vendor specific\n");
851 sprintf(buf
+len
, "T10 Vendor ID based\n");
854 sprintf(buf
+len
, "EUI-64 based\n");
857 sprintf(buf
+len
, "NAA\n");
860 sprintf(buf
+len
, "Relative target port identifier\n");
863 sprintf(buf
+len
, "SCSI name string\n");
866 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
867 vpd
->device_identifier_type
);
873 if (p_buf_len
< strlen(buf
)+1)
875 strncpy(p_buf
, buf
, p_buf_len
);
883 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
886 * The VPD identifier type..
888 * from spc3r23.pdf Section 7.6.3.1 Table 298
890 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
891 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
893 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
895 int transport_dump_vpd_ident(
897 unsigned char *p_buf
,
900 unsigned char buf
[VPD_TMP_BUF_SIZE
];
903 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
905 switch (vpd
->device_identifier_code_set
) {
906 case 0x01: /* Binary */
907 snprintf(buf
, sizeof(buf
),
908 "T10 VPD Binary Device Identifier: %s\n",
909 &vpd
->device_identifier
[0]);
911 case 0x02: /* ASCII */
912 snprintf(buf
, sizeof(buf
),
913 "T10 VPD ASCII Device Identifier: %s\n",
914 &vpd
->device_identifier
[0]);
916 case 0x03: /* UTF-8 */
917 snprintf(buf
, sizeof(buf
),
918 "T10 VPD UTF-8 Device Identifier: %s\n",
919 &vpd
->device_identifier
[0]);
922 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
923 " 0x%02x", vpd
->device_identifier_code_set
);
929 strncpy(p_buf
, buf
, p_buf_len
);
937 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
939 static const char hex_str
[] = "0123456789abcdef";
940 int j
= 0, i
= 4; /* offset to start of the identifier */
943 * The VPD Code Set (encoding)
945 * from spc3r23.pdf Section 7.6.3.1 Table 296
947 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
948 switch (vpd
->device_identifier_code_set
) {
949 case 0x01: /* Binary */
950 vpd
->device_identifier
[j
++] =
951 hex_str
[vpd
->device_identifier_type
];
952 while (i
< (4 + page_83
[3])) {
953 vpd
->device_identifier
[j
++] =
954 hex_str
[(page_83
[i
] & 0xf0) >> 4];
955 vpd
->device_identifier
[j
++] =
956 hex_str
[page_83
[i
] & 0x0f];
960 case 0x02: /* ASCII */
961 case 0x03: /* UTF-8 */
962 while (i
< (4 + page_83
[3]))
963 vpd
->device_identifier
[j
++] = page_83
[i
++];
969 return transport_dump_vpd_ident(vpd
, NULL
, 0);
971 EXPORT_SYMBOL(transport_set_vpd_ident
);
974 target_cmd_size_check(struct se_cmd
*cmd
, unsigned int size
)
976 struct se_device
*dev
= cmd
->se_dev
;
978 if (cmd
->unknown_data_length
) {
979 cmd
->data_length
= size
;
980 } else if (size
!= cmd
->data_length
) {
981 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
982 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
983 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
984 cmd
->data_length
, size
, cmd
->t_task_cdb
[0]);
986 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
987 pr_err("Rejecting underflow/overflow"
989 return TCM_INVALID_CDB_FIELD
;
992 * Reject READ_* or WRITE_* with overflow/underflow for
993 * type SCF_SCSI_DATA_CDB.
995 if (dev
->dev_attrib
.block_size
!= 512) {
996 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
997 " CDB on non 512-byte sector setup subsystem"
998 " plugin: %s\n", dev
->transport
->name
);
999 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1000 return TCM_INVALID_CDB_FIELD
;
1003 * For the overflow case keep the existing fabric provided
1004 * ->data_length. Otherwise for the underflow case, reset
1005 * ->data_length to the smaller SCSI expected data transfer
1008 if (size
> cmd
->data_length
) {
1009 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
1010 cmd
->residual_count
= (size
- cmd
->data_length
);
1012 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
1013 cmd
->residual_count
= (cmd
->data_length
- size
);
1014 cmd
->data_length
= size
;
1023 * Used by fabric modules containing a local struct se_cmd within their
1024 * fabric dependent per I/O descriptor.
1026 void transport_init_se_cmd(
1028 struct target_core_fabric_ops
*tfo
,
1029 struct se_session
*se_sess
,
1033 unsigned char *sense_buffer
)
1035 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1036 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1037 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1038 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1039 INIT_LIST_HEAD(&cmd
->state_list
);
1040 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1041 init_completion(&cmd
->transport_lun_stop_comp
);
1042 init_completion(&cmd
->t_transport_stop_comp
);
1043 init_completion(&cmd
->cmd_wait_comp
);
1044 init_completion(&cmd
->task_stop_comp
);
1045 spin_lock_init(&cmd
->t_state_lock
);
1046 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1049 cmd
->se_sess
= se_sess
;
1050 cmd
->data_length
= data_length
;
1051 cmd
->data_direction
= data_direction
;
1052 cmd
->sam_task_attr
= task_attr
;
1053 cmd
->sense_buffer
= sense_buffer
;
1055 cmd
->state_active
= false;
1057 EXPORT_SYMBOL(transport_init_se_cmd
);
1059 static sense_reason_t
1060 transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1062 struct se_device
*dev
= cmd
->se_dev
;
1065 * Check if SAM Task Attribute emulation is enabled for this
1066 * struct se_device storage object
1068 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1071 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1072 pr_debug("SAM Task Attribute ACA"
1073 " emulation is not supported\n");
1074 return TCM_INVALID_CDB_FIELD
;
1077 * Used to determine when ORDERED commands should go from
1078 * Dormant to Active status.
1080 cmd
->se_ordered_id
= atomic_inc_return(&dev
->dev_ordered_id
);
1081 smp_mb__after_atomic_inc();
1082 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1083 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1084 dev
->transport
->name
);
1089 target_setup_cmd_from_cdb(struct se_cmd
*cmd
, unsigned char *cdb
)
1091 struct se_device
*dev
= cmd
->se_dev
;
1092 unsigned long flags
;
1096 * Ensure that the received CDB is less than the max (252 + 8) bytes
1097 * for VARIABLE_LENGTH_CMD
1099 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1100 pr_err("Received SCSI CDB with command_size: %d that"
1101 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1102 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1103 return TCM_INVALID_CDB_FIELD
;
1106 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1107 * allocate the additional extended CDB buffer now.. Otherwise
1108 * setup the pointer from __t_task_cdb to t_task_cdb.
1110 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1111 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1113 if (!cmd
->t_task_cdb
) {
1114 pr_err("Unable to allocate cmd->t_task_cdb"
1115 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1116 scsi_command_size(cdb
),
1117 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1118 return TCM_OUT_OF_RESOURCES
;
1121 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1123 * Copy the original CDB into cmd->
1125 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1128 * Check for an existing UNIT ATTENTION condition
1130 ret
= target_scsi3_ua_check(cmd
);
1134 ret
= target_alua_state_check(cmd
);
1138 ret
= target_check_reservation(cmd
);
1140 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1144 ret
= dev
->transport
->parse_cdb(cmd
);
1148 ret
= transport_check_alloc_task_attr(cmd
);
1152 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1153 cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1154 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1156 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1157 if (cmd
->se_lun
->lun_sep
)
1158 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1159 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1162 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1165 * Used by fabric module frontends to queue tasks directly.
1166 * Many only be used from process context only
1168 int transport_handle_cdb_direct(
1175 pr_err("cmd->se_lun is NULL\n");
1178 if (in_interrupt()) {
1180 pr_err("transport_generic_handle_cdb cannot be called"
1181 " from interrupt context\n");
1185 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1186 * outstanding descriptors are handled correctly during shutdown via
1187 * transport_wait_for_tasks()
1189 * Also, we don't take cmd->t_state_lock here as we only expect
1190 * this to be called for initial descriptor submission.
1192 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1193 cmd
->transport_state
|= CMD_T_ACTIVE
;
1196 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1197 * so follow TRANSPORT_NEW_CMD processing thread context usage
1198 * and call transport_generic_request_failure() if necessary..
1200 ret
= transport_generic_new_cmd(cmd
);
1202 transport_generic_request_failure(cmd
, ret
);
1205 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1207 static sense_reason_t
1208 transport_generic_map_mem_to_cmd(struct se_cmd
*cmd
, struct scatterlist
*sgl
,
1209 u32 sgl_count
, struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
)
1211 if (!sgl
|| !sgl_count
)
1215 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1216 * scatterlists already have been set to follow what the fabric
1217 * passes for the original expected data transfer length.
1219 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
1220 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1221 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1222 return TCM_INVALID_CDB_FIELD
;
1225 cmd
->t_data_sg
= sgl
;
1226 cmd
->t_data_nents
= sgl_count
;
1228 if (sgl_bidi
&& sgl_bidi_count
) {
1229 cmd
->t_bidi_data_sg
= sgl_bidi
;
1230 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
1232 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
1237 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1238 * se_cmd + use pre-allocated SGL memory.
1240 * @se_cmd: command descriptor to submit
1241 * @se_sess: associated se_sess for endpoint
1242 * @cdb: pointer to SCSI CDB
1243 * @sense: pointer to SCSI sense buffer
1244 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1245 * @data_length: fabric expected data transfer length
1246 * @task_addr: SAM task attribute
1247 * @data_dir: DMA data direction
1248 * @flags: flags for command submission from target_sc_flags_tables
1249 * @sgl: struct scatterlist memory for unidirectional mapping
1250 * @sgl_count: scatterlist count for unidirectional mapping
1251 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1252 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1254 * Returns non zero to signal active I/O shutdown failure. All other
1255 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1256 * but still return zero here.
1258 * This may only be called from process context, and also currently
1259 * assumes internal allocation of fabric payload buffer by target-core.
1261 int target_submit_cmd_map_sgls(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1262 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1263 u32 data_length
, int task_attr
, int data_dir
, int flags
,
1264 struct scatterlist
*sgl
, u32 sgl_count
,
1265 struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
)
1267 struct se_portal_group
*se_tpg
;
1271 se_tpg
= se_sess
->se_tpg
;
1273 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1274 BUG_ON(in_interrupt());
1276 * Initialize se_cmd for target operation. From this point
1277 * exceptions are handled by sending exception status via
1278 * target_core_fabric_ops->queue_status() callback
1280 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1281 data_length
, data_dir
, task_attr
, sense
);
1282 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1283 se_cmd
->unknown_data_length
= 1;
1285 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1286 * se_sess->sess_cmd_list. A second kref_get here is necessary
1287 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1288 * kref_put() to happen during fabric packet acknowledgement.
1290 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1294 * Signal bidirectional data payloads to target-core
1296 if (flags
& TARGET_SCF_BIDI_OP
)
1297 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1299 * Locate se_lun pointer and attach it to struct se_cmd
1301 rc
= transport_lookup_cmd_lun(se_cmd
, unpacked_lun
);
1303 transport_send_check_condition_and_sense(se_cmd
, rc
, 0);
1304 target_put_sess_cmd(se_sess
, se_cmd
);
1308 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1310 transport_generic_request_failure(se_cmd
, rc
);
1314 * When a non zero sgl_count has been passed perform SGL passthrough
1315 * mapping for pre-allocated fabric memory instead of having target
1316 * core perform an internal SGL allocation..
1318 if (sgl_count
!= 0) {
1322 * A work-around for tcm_loop as some userspace code via
1323 * scsi-generic do not memset their associated read buffers,
1324 * so go ahead and do that here for type non-data CDBs. Also
1325 * note that this is currently guaranteed to be a single SGL
1326 * for this case by target core in target_setup_cmd_from_cdb()
1327 * -> transport_generic_cmd_sequencer().
1329 if (!(se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) &&
1330 se_cmd
->data_direction
== DMA_FROM_DEVICE
) {
1331 unsigned char *buf
= NULL
;
1334 buf
= kmap(sg_page(sgl
)) + sgl
->offset
;
1337 memset(buf
, 0, sgl
->length
);
1338 kunmap(sg_page(sgl
));
1342 rc
= transport_generic_map_mem_to_cmd(se_cmd
, sgl
, sgl_count
,
1343 sgl_bidi
, sgl_bidi_count
);
1345 transport_generic_request_failure(se_cmd
, rc
);
1350 * Check if we need to delay processing because of ALUA
1351 * Active/NonOptimized primary access state..
1353 core_alua_check_nonop_delay(se_cmd
);
1355 transport_handle_cdb_direct(se_cmd
);
1358 EXPORT_SYMBOL(target_submit_cmd_map_sgls
);
1361 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1363 * @se_cmd: command descriptor to submit
1364 * @se_sess: associated se_sess for endpoint
1365 * @cdb: pointer to SCSI CDB
1366 * @sense: pointer to SCSI sense buffer
1367 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1368 * @data_length: fabric expected data transfer length
1369 * @task_addr: SAM task attribute
1370 * @data_dir: DMA data direction
1371 * @flags: flags for command submission from target_sc_flags_tables
1373 * Returns non zero to signal active I/O shutdown failure. All other
1374 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1375 * but still return zero here.
1377 * This may only be called from process context, and also currently
1378 * assumes internal allocation of fabric payload buffer by target-core.
1380 * It also assumes interal target core SGL memory allocation.
1382 int target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1383 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1384 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1386 return target_submit_cmd_map_sgls(se_cmd
, se_sess
, cdb
, sense
,
1387 unpacked_lun
, data_length
, task_attr
, data_dir
,
1388 flags
, NULL
, 0, NULL
, 0);
1390 EXPORT_SYMBOL(target_submit_cmd
);
1392 static void target_complete_tmr_failure(struct work_struct
*work
)
1394 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1396 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1397 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1399 transport_cmd_check_stop_to_fabric(se_cmd
);
1403 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1406 * @se_cmd: command descriptor to submit
1407 * @se_sess: associated se_sess for endpoint
1408 * @sense: pointer to SCSI sense buffer
1409 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1410 * @fabric_context: fabric context for TMR req
1411 * @tm_type: Type of TM request
1412 * @gfp: gfp type for caller
1413 * @tag: referenced task tag for TMR_ABORT_TASK
1414 * @flags: submit cmd flags
1416 * Callable from all contexts.
1419 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1420 unsigned char *sense
, u32 unpacked_lun
,
1421 void *fabric_tmr_ptr
, unsigned char tm_type
,
1422 gfp_t gfp
, unsigned int tag
, int flags
)
1424 struct se_portal_group
*se_tpg
;
1427 se_tpg
= se_sess
->se_tpg
;
1430 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1431 0, DMA_NONE
, MSG_SIMPLE_TAG
, sense
);
1433 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1434 * allocation failure.
1436 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1440 if (tm_type
== TMR_ABORT_TASK
)
1441 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1443 /* See target_submit_cmd for commentary */
1444 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1446 core_tmr_release_req(se_cmd
->se_tmr_req
);
1450 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1453 * For callback during failure handling, push this work off
1454 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1456 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1457 schedule_work(&se_cmd
->work
);
1460 transport_generic_handle_tmr(se_cmd
);
1463 EXPORT_SYMBOL(target_submit_tmr
);
1466 * If the cmd is active, request it to be stopped and sleep until it
1469 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1471 bool was_active
= false;
1473 if (cmd
->transport_state
& CMD_T_BUSY
) {
1474 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1475 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1477 pr_debug("cmd %p waiting to complete\n", cmd
);
1478 wait_for_completion(&cmd
->task_stop_comp
);
1479 pr_debug("cmd %p stopped successfully\n", cmd
);
1481 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1482 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1483 cmd
->transport_state
&= ~CMD_T_BUSY
;
1491 * Handle SAM-esque emulation for generic transport request failures.
1493 void transport_generic_request_failure(struct se_cmd
*cmd
,
1494 sense_reason_t sense_reason
)
1498 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1499 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1500 cmd
->t_task_cdb
[0]);
1501 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1502 cmd
->se_tfo
->get_cmd_state(cmd
),
1503 cmd
->t_state
, sense_reason
);
1504 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1505 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1506 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1507 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1510 * For SAM Task Attribute emulation for failed struct se_cmd
1512 transport_complete_task_attr(cmd
);
1514 switch (sense_reason
) {
1515 case TCM_NON_EXISTENT_LUN
:
1516 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1517 case TCM_INVALID_CDB_FIELD
:
1518 case TCM_INVALID_PARAMETER_LIST
:
1519 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
1520 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1521 case TCM_UNKNOWN_MODE_PAGE
:
1522 case TCM_WRITE_PROTECTED
:
1523 case TCM_ADDRESS_OUT_OF_RANGE
:
1524 case TCM_CHECK_CONDITION_ABORT_CMD
:
1525 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1526 case TCM_CHECK_CONDITION_NOT_READY
:
1528 case TCM_OUT_OF_RESOURCES
:
1529 sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1531 case TCM_RESERVATION_CONFLICT
:
1533 * No SENSE Data payload for this case, set SCSI Status
1534 * and queue the response to $FABRIC_MOD.
1536 * Uses linux/include/scsi/scsi.h SAM status codes defs
1538 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1540 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1541 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1544 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1547 cmd
->se_dev
->dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1548 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1549 cmd
->orig_fe_lun
, 0x2C,
1550 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1552 ret
= cmd
->se_tfo
->queue_status(cmd
);
1553 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1557 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1558 cmd
->t_task_cdb
[0], sense_reason
);
1559 sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1563 ret
= transport_send_check_condition_and_sense(cmd
, sense_reason
, 0);
1564 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1568 transport_lun_remove_cmd(cmd
);
1569 if (!transport_cmd_check_stop_to_fabric(cmd
))
1574 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1575 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1577 EXPORT_SYMBOL(transport_generic_request_failure
);
1579 static void __target_execute_cmd(struct se_cmd
*cmd
)
1583 spin_lock_irq(&cmd
->t_state_lock
);
1584 cmd
->transport_state
|= (CMD_T_BUSY
|CMD_T_SENT
);
1585 spin_unlock_irq(&cmd
->t_state_lock
);
1587 if (cmd
->execute_cmd
) {
1588 ret
= cmd
->execute_cmd(cmd
);
1590 spin_lock_irq(&cmd
->t_state_lock
);
1591 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1592 spin_unlock_irq(&cmd
->t_state_lock
);
1594 transport_generic_request_failure(cmd
, ret
);
1599 static bool target_handle_task_attr(struct se_cmd
*cmd
)
1601 struct se_device
*dev
= cmd
->se_dev
;
1603 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1607 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1608 * to allow the passed struct se_cmd list of tasks to the front of the list.
1610 switch (cmd
->sam_task_attr
) {
1612 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1613 "se_ordered_id: %u\n",
1614 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1616 case MSG_ORDERED_TAG
:
1617 atomic_inc(&dev
->dev_ordered_sync
);
1618 smp_mb__after_atomic_inc();
1620 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1621 " se_ordered_id: %u\n",
1622 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1625 * Execute an ORDERED command if no other older commands
1626 * exist that need to be completed first.
1628 if (!atomic_read(&dev
->simple_cmds
))
1633 * For SIMPLE and UNTAGGED Task Attribute commands
1635 atomic_inc(&dev
->simple_cmds
);
1636 smp_mb__after_atomic_inc();
1640 if (atomic_read(&dev
->dev_ordered_sync
) == 0)
1643 spin_lock(&dev
->delayed_cmd_lock
);
1644 list_add_tail(&cmd
->se_delayed_node
, &dev
->delayed_cmd_list
);
1645 spin_unlock(&dev
->delayed_cmd_lock
);
1647 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1648 " delayed CMD list, se_ordered_id: %u\n",
1649 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1650 cmd
->se_ordered_id
);
1654 void target_execute_cmd(struct se_cmd
*cmd
)
1657 * If the received CDB has aleady been aborted stop processing it here.
1659 if (transport_check_aborted_status(cmd
, 1)) {
1660 complete(&cmd
->transport_lun_stop_comp
);
1665 * Determine if IOCTL context caller in requesting the stopping of this
1666 * command for LUN shutdown purposes.
1668 spin_lock_irq(&cmd
->t_state_lock
);
1669 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
1670 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1671 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
1673 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
1674 spin_unlock_irq(&cmd
->t_state_lock
);
1675 complete(&cmd
->transport_lun_stop_comp
);
1679 * Determine if frontend context caller is requesting the stopping of
1680 * this command for frontend exceptions.
1682 if (cmd
->transport_state
& CMD_T_STOP
) {
1683 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1685 cmd
->se_tfo
->get_task_tag(cmd
));
1687 spin_unlock_irq(&cmd
->t_state_lock
);
1688 complete(&cmd
->t_transport_stop_comp
);
1692 cmd
->t_state
= TRANSPORT_PROCESSING
;
1693 cmd
->transport_state
|= CMD_T_ACTIVE
;
1694 spin_unlock_irq(&cmd
->t_state_lock
);
1696 if (!target_handle_task_attr(cmd
))
1697 __target_execute_cmd(cmd
);
1699 EXPORT_SYMBOL(target_execute_cmd
);
1702 * Process all commands up to the last received ORDERED task attribute which
1703 * requires another blocking boundary
1705 static void target_restart_delayed_cmds(struct se_device
*dev
)
1710 spin_lock(&dev
->delayed_cmd_lock
);
1711 if (list_empty(&dev
->delayed_cmd_list
)) {
1712 spin_unlock(&dev
->delayed_cmd_lock
);
1716 cmd
= list_entry(dev
->delayed_cmd_list
.next
,
1717 struct se_cmd
, se_delayed_node
);
1718 list_del(&cmd
->se_delayed_node
);
1719 spin_unlock(&dev
->delayed_cmd_lock
);
1721 __target_execute_cmd(cmd
);
1723 if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
)
1729 * Called from I/O completion to determine which dormant/delayed
1730 * and ordered cmds need to have their tasks added to the execution queue.
1732 static void transport_complete_task_attr(struct se_cmd
*cmd
)
1734 struct se_device
*dev
= cmd
->se_dev
;
1736 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1739 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
1740 atomic_dec(&dev
->simple_cmds
);
1741 smp_mb__after_atomic_dec();
1742 dev
->dev_cur_ordered_id
++;
1743 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1744 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
1745 cmd
->se_ordered_id
);
1746 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1747 dev
->dev_cur_ordered_id
++;
1748 pr_debug("Incremented dev_cur_ordered_id: %u for"
1749 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
1750 cmd
->se_ordered_id
);
1751 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1752 atomic_dec(&dev
->dev_ordered_sync
);
1753 smp_mb__after_atomic_dec();
1755 dev
->dev_cur_ordered_id
++;
1756 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1757 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
1760 target_restart_delayed_cmds(dev
);
1763 static void transport_complete_qf(struct se_cmd
*cmd
)
1767 transport_complete_task_attr(cmd
);
1769 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1770 ret
= cmd
->se_tfo
->queue_status(cmd
);
1775 switch (cmd
->data_direction
) {
1776 case DMA_FROM_DEVICE
:
1777 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1780 if (cmd
->t_bidi_data_sg
) {
1781 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1785 /* Fall through for DMA_TO_DEVICE */
1787 ret
= cmd
->se_tfo
->queue_status(cmd
);
1795 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1798 transport_lun_remove_cmd(cmd
);
1799 transport_cmd_check_stop_to_fabric(cmd
);
1802 static void transport_handle_queue_full(
1804 struct se_device
*dev
)
1806 spin_lock_irq(&dev
->qf_cmd_lock
);
1807 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
1808 atomic_inc(&dev
->dev_qf_count
);
1809 smp_mb__after_atomic_inc();
1810 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
1812 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1815 static void target_complete_ok_work(struct work_struct
*work
)
1817 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
1821 * Check if we need to move delayed/dormant tasks from cmds on the
1822 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1825 transport_complete_task_attr(cmd
);
1828 * Check to schedule QUEUE_FULL work, or execute an existing
1829 * cmd->transport_qf_callback()
1831 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
1832 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1835 * Check if we need to send a sense buffer from
1836 * the struct se_cmd in question.
1838 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1839 WARN_ON(!cmd
->scsi_status
);
1840 ret
= transport_send_check_condition_and_sense(
1842 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1845 transport_lun_remove_cmd(cmd
);
1846 transport_cmd_check_stop_to_fabric(cmd
);
1850 * Check for a callback, used by amongst other things
1851 * XDWRITE_READ_10 emulation.
1853 if (cmd
->transport_complete_callback
)
1854 cmd
->transport_complete_callback(cmd
);
1856 switch (cmd
->data_direction
) {
1857 case DMA_FROM_DEVICE
:
1858 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1859 if (cmd
->se_lun
->lun_sep
) {
1860 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
1863 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1865 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1866 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1870 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1871 if (cmd
->se_lun
->lun_sep
) {
1872 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
1875 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1877 * Check if we need to send READ payload for BIDI-COMMAND
1879 if (cmd
->t_bidi_data_sg
) {
1880 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1881 if (cmd
->se_lun
->lun_sep
) {
1882 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
1885 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1886 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1887 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1891 /* Fall through for DMA_TO_DEVICE */
1893 ret
= cmd
->se_tfo
->queue_status(cmd
);
1894 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1901 transport_lun_remove_cmd(cmd
);
1902 transport_cmd_check_stop_to_fabric(cmd
);
1906 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
1907 " data_direction: %d\n", cmd
, cmd
->data_direction
);
1908 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1909 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1912 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
1914 struct scatterlist
*sg
;
1917 for_each_sg(sgl
, sg
, nents
, count
)
1918 __free_page(sg_page(sg
));
1923 static inline void transport_free_pages(struct se_cmd
*cmd
)
1925 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
1928 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
1929 cmd
->t_data_sg
= NULL
;
1930 cmd
->t_data_nents
= 0;
1932 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
1933 cmd
->t_bidi_data_sg
= NULL
;
1934 cmd
->t_bidi_data_nents
= 0;
1938 * transport_release_cmd - free a command
1939 * @cmd: command to free
1941 * This routine unconditionally frees a command, and reference counting
1942 * or list removal must be done in the caller.
1944 static int transport_release_cmd(struct se_cmd
*cmd
)
1946 BUG_ON(!cmd
->se_tfo
);
1948 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
1949 core_tmr_release_req(cmd
->se_tmr_req
);
1950 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
1951 kfree(cmd
->t_task_cdb
);
1953 * If this cmd has been setup with target_get_sess_cmd(), drop
1954 * the kref and call ->release_cmd() in kref callback.
1956 if (cmd
->check_release
!= 0)
1957 return target_put_sess_cmd(cmd
->se_sess
, cmd
);
1959 cmd
->se_tfo
->release_cmd(cmd
);
1964 * transport_put_cmd - release a reference to a command
1965 * @cmd: command to release
1967 * This routine releases our reference to the command and frees it if possible.
1969 static int transport_put_cmd(struct se_cmd
*cmd
)
1971 transport_free_pages(cmd
);
1972 return transport_release_cmd(cmd
);
1975 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
1977 struct scatterlist
*sg
= cmd
->t_data_sg
;
1978 struct page
**pages
;
1982 * We need to take into account a possible offset here for fabrics like
1983 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
1984 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
1986 if (!cmd
->t_data_nents
)
1990 if (cmd
->t_data_nents
== 1)
1991 return kmap(sg_page(sg
)) + sg
->offset
;
1993 /* >1 page. use vmap */
1994 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
1998 /* convert sg[] to pages[] */
1999 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
2000 pages
[i
] = sg_page(sg
);
2003 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
2005 if (!cmd
->t_data_vmap
)
2008 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
2010 EXPORT_SYMBOL(transport_kmap_data_sg
);
2012 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
2014 if (!cmd
->t_data_nents
) {
2016 } else if (cmd
->t_data_nents
== 1) {
2017 kunmap(sg_page(cmd
->t_data_sg
));
2021 vunmap(cmd
->t_data_vmap
);
2022 cmd
->t_data_vmap
= NULL
;
2024 EXPORT_SYMBOL(transport_kunmap_data_sg
);
2027 transport_generic_get_mem(struct se_cmd
*cmd
)
2029 u32 length
= cmd
->data_length
;
2035 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
2036 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
2037 if (!cmd
->t_data_sg
)
2040 cmd
->t_data_nents
= nents
;
2041 sg_init_table(cmd
->t_data_sg
, nents
);
2043 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
? 0 : __GFP_ZERO
;
2046 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
2047 page
= alloc_page(GFP_KERNEL
| zero_flag
);
2051 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
2060 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
2062 kfree(cmd
->t_data_sg
);
2063 cmd
->t_data_sg
= NULL
;
2068 * Allocate any required resources to execute the command. For writes we
2069 * might not have the payload yet, so notify the fabric via a call to
2070 * ->write_pending instead. Otherwise place it on the execution queue.
2073 transport_generic_new_cmd(struct se_cmd
*cmd
)
2078 * Determine is the TCM fabric module has already allocated physical
2079 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2082 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
2084 ret
= transport_generic_get_mem(cmd
);
2086 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2089 * If this command is not a write we can execute it right here,
2090 * for write buffers we need to notify the fabric driver first
2091 * and let it call back once the write buffers are ready.
2093 target_add_to_state_list(cmd
);
2094 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
2095 target_execute_cmd(cmd
);
2098 transport_cmd_check_stop(cmd
, false, true);
2100 ret
= cmd
->se_tfo
->write_pending(cmd
);
2101 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2104 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2107 return (!ret
) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2110 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
2111 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
2112 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2115 EXPORT_SYMBOL(transport_generic_new_cmd
);
2117 static void transport_write_pending_qf(struct se_cmd
*cmd
)
2121 ret
= cmd
->se_tfo
->write_pending(cmd
);
2122 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
2123 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2125 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2129 int transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
2133 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
2134 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
2135 transport_wait_for_tasks(cmd
);
2137 ret
= transport_release_cmd(cmd
);
2140 transport_wait_for_tasks(cmd
);
2143 transport_lun_remove_cmd(cmd
);
2145 ret
= transport_put_cmd(cmd
);
2149 EXPORT_SYMBOL(transport_generic_free_cmd
);
2151 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2152 * @se_sess: session to reference
2153 * @se_cmd: command descriptor to add
2154 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2156 int target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
2159 unsigned long flags
;
2162 kref_init(&se_cmd
->cmd_kref
);
2164 * Add a second kref if the fabric caller is expecting to handle
2165 * fabric acknowledgement that requires two target_put_sess_cmd()
2166 * invocations before se_cmd descriptor release.
2168 if (ack_kref
== true) {
2169 kref_get(&se_cmd
->cmd_kref
);
2170 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
2173 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2174 if (se_sess
->sess_tearing_down
) {
2178 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
2179 se_cmd
->check_release
= 1;
2182 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2185 EXPORT_SYMBOL(target_get_sess_cmd
);
2187 static void target_release_cmd_kref(struct kref
*kref
)
2189 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
2190 struct se_session
*se_sess
= se_cmd
->se_sess
;
2192 if (list_empty(&se_cmd
->se_cmd_list
)) {
2193 spin_unlock(&se_sess
->sess_cmd_lock
);
2194 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2197 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
2198 spin_unlock(&se_sess
->sess_cmd_lock
);
2199 complete(&se_cmd
->cmd_wait_comp
);
2202 list_del(&se_cmd
->se_cmd_list
);
2203 spin_unlock(&se_sess
->sess_cmd_lock
);
2205 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2208 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2209 * @se_sess: session to reference
2210 * @se_cmd: command descriptor to drop
2212 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
2214 return kref_put_spinlock_irqsave(&se_cmd
->cmd_kref
, target_release_cmd_kref
,
2215 &se_sess
->sess_cmd_lock
);
2217 EXPORT_SYMBOL(target_put_sess_cmd
);
2219 /* target_sess_cmd_list_set_waiting - Flag all commands in
2220 * sess_cmd_list to complete cmd_wait_comp. Set
2221 * sess_tearing_down so no more commands are queued.
2222 * @se_sess: session to flag
2224 void target_sess_cmd_list_set_waiting(struct se_session
*se_sess
)
2226 struct se_cmd
*se_cmd
;
2227 unsigned long flags
;
2229 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2230 if (se_sess
->sess_tearing_down
) {
2231 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2234 se_sess
->sess_tearing_down
= 1;
2235 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
2237 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
2238 se_cmd
->cmd_wait_set
= 1;
2240 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2242 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting
);
2244 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2245 * @se_sess: session to wait for active I/O
2247 void target_wait_for_sess_cmds(struct se_session
*se_sess
)
2249 struct se_cmd
*se_cmd
, *tmp_cmd
;
2250 unsigned long flags
;
2252 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
2253 &se_sess
->sess_wait_list
, se_cmd_list
) {
2254 list_del(&se_cmd
->se_cmd_list
);
2256 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2257 " %d\n", se_cmd
, se_cmd
->t_state
,
2258 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2260 wait_for_completion(&se_cmd
->cmd_wait_comp
);
2261 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2262 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2263 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2265 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2268 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2269 WARN_ON(!list_empty(&se_sess
->sess_cmd_list
));
2270 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2273 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
2275 /* transport_lun_wait_for_tasks():
2277 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2278 * an struct se_lun to be successfully shutdown.
2280 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
2282 unsigned long flags
;
2286 * If the frontend has already requested this struct se_cmd to
2287 * be stopped, we can safely ignore this struct se_cmd.
2289 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2290 if (cmd
->transport_state
& CMD_T_STOP
) {
2291 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
2293 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2294 cmd
->se_tfo
->get_task_tag(cmd
));
2295 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2296 transport_cmd_check_stop(cmd
, false, false);
2299 cmd
->transport_state
|= CMD_T_LUN_FE_STOP
;
2300 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2302 // XXX: audit task_flags checks.
2303 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2304 if ((cmd
->transport_state
& CMD_T_BUSY
) &&
2305 (cmd
->transport_state
& CMD_T_SENT
)) {
2306 if (!target_stop_cmd(cmd
, &flags
))
2309 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2311 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2314 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2315 cmd
->se_tfo
->get_task_tag(cmd
));
2316 wait_for_completion(&cmd
->transport_lun_stop_comp
);
2317 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2318 cmd
->se_tfo
->get_task_tag(cmd
));
2324 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
2326 struct se_cmd
*cmd
= NULL
;
2327 unsigned long lun_flags
, cmd_flags
;
2329 * Do exception processing and return CHECK_CONDITION status to the
2332 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2333 while (!list_empty(&lun
->lun_cmd_list
)) {
2334 cmd
= list_first_entry(&lun
->lun_cmd_list
,
2335 struct se_cmd
, se_lun_node
);
2336 list_del_init(&cmd
->se_lun_node
);
2338 spin_lock(&cmd
->t_state_lock
);
2339 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2340 "_lun_stop for ITT: 0x%08x\n",
2341 cmd
->se_lun
->unpacked_lun
,
2342 cmd
->se_tfo
->get_task_tag(cmd
));
2343 cmd
->transport_state
|= CMD_T_LUN_STOP
;
2344 spin_unlock(&cmd
->t_state_lock
);
2346 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
2349 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2350 cmd
->se_tfo
->get_task_tag(cmd
),
2351 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2355 * If the Storage engine still owns the iscsi_cmd_t, determine
2356 * and/or stop its context.
2358 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2359 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
2360 cmd
->se_tfo
->get_task_tag(cmd
));
2362 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
2363 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2367 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2368 "_wait_for_tasks(): SUCCESS\n",
2369 cmd
->se_lun
->unpacked_lun
,
2370 cmd
->se_tfo
->get_task_tag(cmd
));
2372 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
2373 if (!(cmd
->transport_state
& CMD_T_DEV_ACTIVE
)) {
2374 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2377 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
2378 target_remove_from_state_list(cmd
);
2379 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2382 * The Storage engine stopped this struct se_cmd before it was
2383 * send to the fabric frontend for delivery back to the
2384 * Initiator Node. Return this SCSI CDB back with an
2385 * CHECK_CONDITION status.
2388 transport_send_check_condition_and_sense(cmd
,
2389 TCM_NON_EXISTENT_LUN
, 0);
2391 * If the fabric frontend is waiting for this iscsi_cmd_t to
2392 * be released, notify the waiting thread now that LU has
2393 * finished accessing it.
2395 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
2396 if (cmd
->transport_state
& CMD_T_LUN_FE_STOP
) {
2397 pr_debug("SE_LUN[%d] - Detected FE stop for"
2398 " struct se_cmd: %p ITT: 0x%08x\n",
2400 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
2402 spin_unlock_irqrestore(&cmd
->t_state_lock
,
2404 transport_cmd_check_stop(cmd
, false, false);
2405 complete(&cmd
->transport_lun_fe_stop_comp
);
2406 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2409 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2410 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
2412 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2413 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2415 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
2418 static int transport_clear_lun_thread(void *p
)
2420 struct se_lun
*lun
= p
;
2422 __transport_clear_lun_from_sessions(lun
);
2423 complete(&lun
->lun_shutdown_comp
);
2428 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
2430 struct task_struct
*kt
;
2432 kt
= kthread_run(transport_clear_lun_thread
, lun
,
2433 "tcm_cl_%u", lun
->unpacked_lun
);
2435 pr_err("Unable to start clear_lun thread\n");
2438 wait_for_completion(&lun
->lun_shutdown_comp
);
2444 * transport_wait_for_tasks - wait for completion to occur
2445 * @cmd: command to wait
2447 * Called from frontend fabric context to wait for storage engine
2448 * to pause and/or release frontend generated struct se_cmd.
2450 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
2452 unsigned long flags
;
2454 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2455 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
2456 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2457 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2461 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
2462 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2463 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2467 * If we are already stopped due to an external event (ie: LUN shutdown)
2468 * sleep until the connection can have the passed struct se_cmd back.
2469 * The cmd->transport_lun_stopped_sem will be upped by
2470 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2471 * has completed its operation on the struct se_cmd.
2473 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
2474 pr_debug("wait_for_tasks: Stopping"
2475 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2476 "_stop_comp); for ITT: 0x%08x\n",
2477 cmd
->se_tfo
->get_task_tag(cmd
));
2479 * There is a special case for WRITES where a FE exception +
2480 * LUN shutdown means ConfigFS context is still sleeping on
2481 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2482 * We go ahead and up transport_lun_stop_comp just to be sure
2485 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2486 complete(&cmd
->transport_lun_stop_comp
);
2487 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
2488 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2490 target_remove_from_state_list(cmd
);
2492 * At this point, the frontend who was the originator of this
2493 * struct se_cmd, now owns the structure and can be released through
2494 * normal means below.
2496 pr_debug("wait_for_tasks: Stopped"
2497 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2498 "stop_comp); for ITT: 0x%08x\n",
2499 cmd
->se_tfo
->get_task_tag(cmd
));
2501 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
2504 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
2505 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2509 cmd
->transport_state
|= CMD_T_STOP
;
2511 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2512 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2513 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
2514 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2516 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2518 wait_for_completion(&cmd
->t_transport_stop_comp
);
2520 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2521 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
2523 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2524 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2525 cmd
->se_tfo
->get_task_tag(cmd
));
2527 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2531 EXPORT_SYMBOL(transport_wait_for_tasks
);
2533 static int transport_get_sense_codes(
2538 *asc
= cmd
->scsi_asc
;
2539 *ascq
= cmd
->scsi_ascq
;
2545 transport_send_check_condition_and_sense(struct se_cmd
*cmd
,
2546 sense_reason_t reason
, int from_transport
)
2548 unsigned char *buffer
= cmd
->sense_buffer
;
2549 unsigned long flags
;
2550 u8 asc
= 0, ascq
= 0;
2552 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2553 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2554 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2557 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
2558 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2560 if (!reason
&& from_transport
)
2563 if (!from_transport
)
2564 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
2567 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2568 * SENSE KEY values from include/scsi/scsi.h
2574 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2576 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2577 /* NO ADDITIONAL SENSE INFORMATION */
2578 buffer
[SPC_ASC_KEY_OFFSET
] = 0;
2579 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0;
2581 case TCM_NON_EXISTENT_LUN
:
2584 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2585 /* ILLEGAL REQUEST */
2586 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2587 /* LOGICAL UNIT NOT SUPPORTED */
2588 buffer
[SPC_ASC_KEY_OFFSET
] = 0x25;
2590 case TCM_UNSUPPORTED_SCSI_OPCODE
:
2591 case TCM_SECTOR_COUNT_TOO_MANY
:
2594 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2595 /* ILLEGAL REQUEST */
2596 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2597 /* INVALID COMMAND OPERATION CODE */
2598 buffer
[SPC_ASC_KEY_OFFSET
] = 0x20;
2600 case TCM_UNKNOWN_MODE_PAGE
:
2603 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2604 /* ILLEGAL REQUEST */
2605 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2606 /* INVALID FIELD IN CDB */
2607 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2609 case TCM_CHECK_CONDITION_ABORT_CMD
:
2612 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2613 /* ABORTED COMMAND */
2614 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2615 /* BUS DEVICE RESET FUNCTION OCCURRED */
2616 buffer
[SPC_ASC_KEY_OFFSET
] = 0x29;
2617 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2619 case TCM_INCORRECT_AMOUNT_OF_DATA
:
2622 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2623 /* ABORTED COMMAND */
2624 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2626 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2627 /* NOT ENOUGH UNSOLICITED DATA */
2628 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0d;
2630 case TCM_INVALID_CDB_FIELD
:
2633 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2634 /* ILLEGAL REQUEST */
2635 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2636 /* INVALID FIELD IN CDB */
2637 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2639 case TCM_INVALID_PARAMETER_LIST
:
2642 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2643 /* ILLEGAL REQUEST */
2644 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2645 /* INVALID FIELD IN PARAMETER LIST */
2646 buffer
[SPC_ASC_KEY_OFFSET
] = 0x26;
2648 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
2651 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2652 /* ILLEGAL REQUEST */
2653 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2654 /* PARAMETER LIST LENGTH ERROR */
2655 buffer
[SPC_ASC_KEY_OFFSET
] = 0x1a;
2657 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
2660 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2661 /* ABORTED COMMAND */
2662 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2664 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2665 /* UNEXPECTED_UNSOLICITED_DATA */
2666 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0c;
2668 case TCM_SERVICE_CRC_ERROR
:
2671 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2672 /* ABORTED COMMAND */
2673 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2674 /* PROTOCOL SERVICE CRC ERROR */
2675 buffer
[SPC_ASC_KEY_OFFSET
] = 0x47;
2677 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x05;
2679 case TCM_SNACK_REJECTED
:
2682 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2683 /* ABORTED COMMAND */
2684 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2686 buffer
[SPC_ASC_KEY_OFFSET
] = 0x11;
2687 /* FAILED RETRANSMISSION REQUEST */
2688 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x13;
2690 case TCM_WRITE_PROTECTED
:
2693 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2695 buffer
[SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
2696 /* WRITE PROTECTED */
2697 buffer
[SPC_ASC_KEY_OFFSET
] = 0x27;
2699 case TCM_ADDRESS_OUT_OF_RANGE
:
2702 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2703 /* ILLEGAL REQUEST */
2704 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2705 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2706 buffer
[SPC_ASC_KEY_OFFSET
] = 0x21;
2708 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
2711 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2712 /* UNIT ATTENTION */
2713 buffer
[SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
2714 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
2715 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2716 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2718 case TCM_CHECK_CONDITION_NOT_READY
:
2721 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2723 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2724 transport_get_sense_codes(cmd
, &asc
, &ascq
);
2725 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2726 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2728 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
2732 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2734 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2735 * Solaris initiators. Returning NOT READY instead means the
2736 * operations will be retried a finite number of times and we
2737 * can survive intermittent errors.
2739 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2740 /* LOGICAL UNIT COMMUNICATION FAILURE */
2741 buffer
[SPC_ASC_KEY_OFFSET
] = 0x08;
2745 * This code uses linux/include/scsi/scsi.h SAM status codes!
2747 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
2749 * Automatically padded, this value is encoded in the fabric's
2750 * data_length response PDU containing the SCSI defined sense data.
2752 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
2755 return cmd
->se_tfo
->queue_status(cmd
);
2757 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
2759 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
2761 if (!(cmd
->transport_state
& CMD_T_ABORTED
))
2764 if (!send_status
|| (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
2767 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2768 cmd
->t_task_cdb
[0], cmd
->se_tfo
->get_task_tag(cmd
));
2770 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
2771 cmd
->se_tfo
->queue_status(cmd
);
2775 EXPORT_SYMBOL(transport_check_aborted_status
);
2777 void transport_send_task_abort(struct se_cmd
*cmd
)
2779 unsigned long flags
;
2781 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2782 if (cmd
->se_cmd_flags
& (SCF_SENT_CHECK_CONDITION
| SCF_SENT_DELAYED_TAS
)) {
2783 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2786 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2789 * If there are still expected incoming fabric WRITEs, we wait
2790 * until until they have completed before sending a TASK_ABORTED
2791 * response. This response with TASK_ABORTED status will be
2792 * queued back to fabric module by transport_check_aborted_status().
2794 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
2795 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
2796 cmd
->transport_state
|= CMD_T_ABORTED
;
2797 smp_mb__after_atomic_inc();
2800 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
2802 transport_lun_remove_cmd(cmd
);
2804 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2805 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
2806 cmd
->se_tfo
->get_task_tag(cmd
));
2808 cmd
->se_tfo
->queue_status(cmd
);
2811 static void target_tmr_work(struct work_struct
*work
)
2813 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
2814 struct se_device
*dev
= cmd
->se_dev
;
2815 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
2818 switch (tmr
->function
) {
2819 case TMR_ABORT_TASK
:
2820 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
2822 case TMR_ABORT_TASK_SET
:
2824 case TMR_CLEAR_TASK_SET
:
2825 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
2828 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
2829 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
2830 TMR_FUNCTION_REJECTED
;
2832 case TMR_TARGET_WARM_RESET
:
2833 tmr
->response
= TMR_FUNCTION_REJECTED
;
2835 case TMR_TARGET_COLD_RESET
:
2836 tmr
->response
= TMR_FUNCTION_REJECTED
;
2839 pr_err("Uknown TMR function: 0x%02x.\n",
2841 tmr
->response
= TMR_FUNCTION_REJECTED
;
2845 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
2846 cmd
->se_tfo
->queue_tm_rsp(cmd
);
2848 transport_cmd_check_stop_to_fabric(cmd
);
2851 int transport_generic_handle_tmr(
2854 INIT_WORK(&cmd
->work
, target_tmr_work
);
2855 queue_work(cmd
->se_dev
->tmr_wq
, &cmd
->work
);
2858 EXPORT_SYMBOL(transport_generic_handle_tmr
);