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 void 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 spin_lock_init(&se_sess
->sess_cmd_lock
);
225 kref_init(&se_sess
->sess_kref
);
229 EXPORT_SYMBOL(transport_init_session
);
232 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
234 void __transport_register_session(
235 struct se_portal_group
*se_tpg
,
236 struct se_node_acl
*se_nacl
,
237 struct se_session
*se_sess
,
238 void *fabric_sess_ptr
)
240 unsigned char buf
[PR_REG_ISID_LEN
];
242 se_sess
->se_tpg
= se_tpg
;
243 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
245 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
247 * Only set for struct se_session's that will actually be moving I/O.
248 * eg: *NOT* discovery sessions.
252 * If the fabric module supports an ISID based TransportID,
253 * save this value in binary from the fabric I_T Nexus now.
255 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
256 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
257 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
258 &buf
[0], PR_REG_ISID_LEN
);
259 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
261 kref_get(&se_nacl
->acl_kref
);
263 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
265 * The se_nacl->nacl_sess pointer will be set to the
266 * last active I_T Nexus for each struct se_node_acl.
268 se_nacl
->nacl_sess
= se_sess
;
270 list_add_tail(&se_sess
->sess_acl_list
,
271 &se_nacl
->acl_sess_list
);
272 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
274 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
276 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
277 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
279 EXPORT_SYMBOL(__transport_register_session
);
281 void transport_register_session(
282 struct se_portal_group
*se_tpg
,
283 struct se_node_acl
*se_nacl
,
284 struct se_session
*se_sess
,
285 void *fabric_sess_ptr
)
289 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
290 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
291 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
293 EXPORT_SYMBOL(transport_register_session
);
295 static void target_release_session(struct kref
*kref
)
297 struct se_session
*se_sess
= container_of(kref
,
298 struct se_session
, sess_kref
);
299 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
301 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
304 void target_get_session(struct se_session
*se_sess
)
306 kref_get(&se_sess
->sess_kref
);
308 EXPORT_SYMBOL(target_get_session
);
310 void target_put_session(struct se_session
*se_sess
)
312 struct se_portal_group
*tpg
= se_sess
->se_tpg
;
314 if (tpg
->se_tpg_tfo
->put_session
!= NULL
) {
315 tpg
->se_tpg_tfo
->put_session(se_sess
);
318 kref_put(&se_sess
->sess_kref
, target_release_session
);
320 EXPORT_SYMBOL(target_put_session
);
322 static void target_complete_nacl(struct kref
*kref
)
324 struct se_node_acl
*nacl
= container_of(kref
,
325 struct se_node_acl
, acl_kref
);
327 complete(&nacl
->acl_free_comp
);
330 void target_put_nacl(struct se_node_acl
*nacl
)
332 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
335 void transport_deregister_session_configfs(struct se_session
*se_sess
)
337 struct se_node_acl
*se_nacl
;
340 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
342 se_nacl
= se_sess
->se_node_acl
;
344 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
345 if (se_nacl
->acl_stop
== 0)
346 list_del(&se_sess
->sess_acl_list
);
348 * If the session list is empty, then clear the pointer.
349 * Otherwise, set the struct se_session pointer from the tail
350 * element of the per struct se_node_acl active session list.
352 if (list_empty(&se_nacl
->acl_sess_list
))
353 se_nacl
->nacl_sess
= NULL
;
355 se_nacl
->nacl_sess
= container_of(
356 se_nacl
->acl_sess_list
.prev
,
357 struct se_session
, sess_acl_list
);
359 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
362 EXPORT_SYMBOL(transport_deregister_session_configfs
);
364 void transport_free_session(struct se_session
*se_sess
)
366 kmem_cache_free(se_sess_cache
, se_sess
);
368 EXPORT_SYMBOL(transport_free_session
);
370 void transport_deregister_session(struct se_session
*se_sess
)
372 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
373 struct target_core_fabric_ops
*se_tfo
;
374 struct se_node_acl
*se_nacl
;
376 bool comp_nacl
= true;
379 transport_free_session(se_sess
);
382 se_tfo
= se_tpg
->se_tpg_tfo
;
384 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
385 list_del(&se_sess
->sess_list
);
386 se_sess
->se_tpg
= NULL
;
387 se_sess
->fabric_sess_ptr
= NULL
;
388 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
391 * Determine if we need to do extra work for this initiator node's
392 * struct se_node_acl if it had been previously dynamically generated.
394 se_nacl
= se_sess
->se_node_acl
;
396 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
397 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
398 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
399 list_del(&se_nacl
->acl_list
);
400 se_tpg
->num_node_acls
--;
401 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
402 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
403 core_free_device_list_for_node(se_nacl
, se_tpg
);
404 se_tfo
->tpg_release_fabric_acl(se_tpg
, se_nacl
);
407 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
410 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
412 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
413 se_tpg
->se_tpg_tfo
->get_fabric_name());
415 * If last kref is dropping now for an explict NodeACL, awake sleeping
416 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
419 if (se_nacl
&& comp_nacl
== true)
420 target_put_nacl(se_nacl
);
422 transport_free_session(se_sess
);
424 EXPORT_SYMBOL(transport_deregister_session
);
427 * Called with cmd->t_state_lock held.
429 static void target_remove_from_state_list(struct se_cmd
*cmd
)
431 struct se_device
*dev
= cmd
->se_dev
;
437 if (cmd
->transport_state
& CMD_T_BUSY
)
440 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
441 if (cmd
->state_active
) {
442 list_del(&cmd
->state_list
);
443 cmd
->state_active
= false;
445 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
448 static int transport_cmd_check_stop(struct se_cmd
*cmd
, bool remove_from_lists
)
452 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
454 * Determine if IOCTL context caller in requesting the stopping of this
455 * command for LUN shutdown purposes.
457 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
458 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
459 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
461 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
462 if (remove_from_lists
)
463 target_remove_from_state_list(cmd
);
464 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
466 complete(&cmd
->transport_lun_stop_comp
);
470 if (remove_from_lists
) {
471 target_remove_from_state_list(cmd
);
474 * Clear struct se_cmd->se_lun before the handoff to FE.
480 * Determine if frontend context caller is requesting the stopping of
481 * this command for frontend exceptions.
483 if (cmd
->transport_state
& CMD_T_STOP
) {
484 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
486 cmd
->se_tfo
->get_task_tag(cmd
));
488 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
490 complete(&cmd
->t_transport_stop_comp
);
494 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
495 if (remove_from_lists
) {
497 * Some fabric modules like tcm_loop can release
498 * their internally allocated I/O reference now and
501 * Fabric modules are expected to return '1' here if the
502 * se_cmd being passed is released at this point,
503 * or zero if not being released.
505 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
506 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
507 return cmd
->se_tfo
->check_stop_free(cmd
);
511 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
515 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
517 return transport_cmd_check_stop(cmd
, true);
520 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
522 struct se_lun
*lun
= cmd
->se_lun
;
528 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
529 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
530 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
531 target_remove_from_state_list(cmd
);
533 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
535 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
536 if (!list_empty(&cmd
->se_lun_node
))
537 list_del_init(&cmd
->se_lun_node
);
538 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
541 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
543 if (transport_cmd_check_stop_to_fabric(cmd
))
546 transport_put_cmd(cmd
);
549 static void target_complete_failure_work(struct work_struct
*work
)
551 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
553 transport_generic_request_failure(cmd
,
554 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
);
558 * Used when asking transport to copy Sense Data from the underlying
559 * Linux/SCSI struct scsi_cmnd
561 static unsigned char *transport_get_sense_buffer(struct se_cmd
*cmd
)
563 struct se_device
*dev
= cmd
->se_dev
;
565 WARN_ON(!cmd
->se_lun
);
570 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
)
573 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
575 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
576 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
577 return cmd
->sense_buffer
;
580 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
582 struct se_device
*dev
= cmd
->se_dev
;
583 int success
= scsi_status
== GOOD
;
586 cmd
->scsi_status
= scsi_status
;
589 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
590 cmd
->transport_state
&= ~CMD_T_BUSY
;
592 if (dev
&& dev
->transport
->transport_complete
) {
593 dev
->transport
->transport_complete(cmd
,
595 transport_get_sense_buffer(cmd
));
596 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
601 * See if we are waiting to complete for an exception condition.
603 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
604 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
605 complete(&cmd
->task_stop_comp
);
610 cmd
->transport_state
|= CMD_T_FAILED
;
613 * Check for case where an explict ABORT_TASK has been received
614 * and transport_wait_for_tasks() will be waiting for completion..
616 if (cmd
->transport_state
& CMD_T_ABORTED
&&
617 cmd
->transport_state
& CMD_T_STOP
) {
618 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
619 complete(&cmd
->t_transport_stop_comp
);
621 } else if (cmd
->transport_state
& CMD_T_FAILED
) {
622 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
624 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
627 cmd
->t_state
= TRANSPORT_COMPLETE
;
628 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
629 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
631 queue_work(target_completion_wq
, &cmd
->work
);
633 EXPORT_SYMBOL(target_complete_cmd
);
635 static void target_add_to_state_list(struct se_cmd
*cmd
)
637 struct se_device
*dev
= cmd
->se_dev
;
640 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
641 if (!cmd
->state_active
) {
642 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
643 cmd
->state_active
= true;
645 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
649 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
651 static void transport_write_pending_qf(struct se_cmd
*cmd
);
652 static void transport_complete_qf(struct se_cmd
*cmd
);
654 void target_qf_do_work(struct work_struct
*work
)
656 struct se_device
*dev
= container_of(work
, struct se_device
,
658 LIST_HEAD(qf_cmd_list
);
659 struct se_cmd
*cmd
, *cmd_tmp
;
661 spin_lock_irq(&dev
->qf_cmd_lock
);
662 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
663 spin_unlock_irq(&dev
->qf_cmd_lock
);
665 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
666 list_del(&cmd
->se_qf_node
);
667 atomic_dec(&dev
->dev_qf_count
);
668 smp_mb__after_atomic_dec();
670 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
671 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
672 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
673 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
676 if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
)
677 transport_write_pending_qf(cmd
);
678 else if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
)
679 transport_complete_qf(cmd
);
683 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
685 switch (cmd
->data_direction
) {
688 case DMA_FROM_DEVICE
:
692 case DMA_BIDIRECTIONAL
:
701 void transport_dump_dev_state(
702 struct se_device
*dev
,
706 *bl
+= sprintf(b
+ *bl
, "Status: ");
707 if (dev
->export_count
)
708 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
710 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
712 *bl
+= sprintf(b
+ *bl
, " Max Queue Depth: %d", dev
->queue_depth
);
713 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u HwMaxSectors: %u\n",
714 dev
->dev_attrib
.block_size
,
715 dev
->dev_attrib
.hw_max_sectors
);
716 *bl
+= sprintf(b
+ *bl
, " ");
719 void transport_dump_vpd_proto_id(
721 unsigned char *p_buf
,
724 unsigned char buf
[VPD_TMP_BUF_SIZE
];
727 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
728 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
730 switch (vpd
->protocol_identifier
) {
732 sprintf(buf
+len
, "Fibre Channel\n");
735 sprintf(buf
+len
, "Parallel SCSI\n");
738 sprintf(buf
+len
, "SSA\n");
741 sprintf(buf
+len
, "IEEE 1394\n");
744 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
748 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
751 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
754 sprintf(buf
+len
, "Automation/Drive Interface Transport"
758 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
761 sprintf(buf
+len
, "Unknown 0x%02x\n",
762 vpd
->protocol_identifier
);
767 strncpy(p_buf
, buf
, p_buf_len
);
773 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
776 * Check if the Protocol Identifier Valid (PIV) bit is set..
778 * from spc3r23.pdf section 7.5.1
780 if (page_83
[1] & 0x80) {
781 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
782 vpd
->protocol_identifier_set
= 1;
783 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
786 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
788 int transport_dump_vpd_assoc(
790 unsigned char *p_buf
,
793 unsigned char buf
[VPD_TMP_BUF_SIZE
];
797 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
798 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
800 switch (vpd
->association
) {
802 sprintf(buf
+len
, "addressed logical unit\n");
805 sprintf(buf
+len
, "target port\n");
808 sprintf(buf
+len
, "SCSI target device\n");
811 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
817 strncpy(p_buf
, buf
, p_buf_len
);
824 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
827 * The VPD identification association..
829 * from spc3r23.pdf Section 7.6.3.1 Table 297
831 vpd
->association
= (page_83
[1] & 0x30);
832 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
834 EXPORT_SYMBOL(transport_set_vpd_assoc
);
836 int transport_dump_vpd_ident_type(
838 unsigned char *p_buf
,
841 unsigned char buf
[VPD_TMP_BUF_SIZE
];
845 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
846 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
848 switch (vpd
->device_identifier_type
) {
850 sprintf(buf
+len
, "Vendor specific\n");
853 sprintf(buf
+len
, "T10 Vendor ID based\n");
856 sprintf(buf
+len
, "EUI-64 based\n");
859 sprintf(buf
+len
, "NAA\n");
862 sprintf(buf
+len
, "Relative target port identifier\n");
865 sprintf(buf
+len
, "SCSI name string\n");
868 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
869 vpd
->device_identifier_type
);
875 if (p_buf_len
< strlen(buf
)+1)
877 strncpy(p_buf
, buf
, p_buf_len
);
885 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
888 * The VPD identifier type..
890 * from spc3r23.pdf Section 7.6.3.1 Table 298
892 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
893 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
895 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
897 int transport_dump_vpd_ident(
899 unsigned char *p_buf
,
902 unsigned char buf
[VPD_TMP_BUF_SIZE
];
905 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
907 switch (vpd
->device_identifier_code_set
) {
908 case 0x01: /* Binary */
909 snprintf(buf
, sizeof(buf
),
910 "T10 VPD Binary Device Identifier: %s\n",
911 &vpd
->device_identifier
[0]);
913 case 0x02: /* ASCII */
914 snprintf(buf
, sizeof(buf
),
915 "T10 VPD ASCII Device Identifier: %s\n",
916 &vpd
->device_identifier
[0]);
918 case 0x03: /* UTF-8 */
919 snprintf(buf
, sizeof(buf
),
920 "T10 VPD UTF-8 Device Identifier: %s\n",
921 &vpd
->device_identifier
[0]);
924 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
925 " 0x%02x", vpd
->device_identifier_code_set
);
931 strncpy(p_buf
, buf
, p_buf_len
);
939 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
941 static const char hex_str
[] = "0123456789abcdef";
942 int j
= 0, i
= 4; /* offset to start of the identifier */
945 * The VPD Code Set (encoding)
947 * from spc3r23.pdf Section 7.6.3.1 Table 296
949 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
950 switch (vpd
->device_identifier_code_set
) {
951 case 0x01: /* Binary */
952 vpd
->device_identifier
[j
++] =
953 hex_str
[vpd
->device_identifier_type
];
954 while (i
< (4 + page_83
[3])) {
955 vpd
->device_identifier
[j
++] =
956 hex_str
[(page_83
[i
] & 0xf0) >> 4];
957 vpd
->device_identifier
[j
++] =
958 hex_str
[page_83
[i
] & 0x0f];
962 case 0x02: /* ASCII */
963 case 0x03: /* UTF-8 */
964 while (i
< (4 + page_83
[3]))
965 vpd
->device_identifier
[j
++] = page_83
[i
++];
971 return transport_dump_vpd_ident(vpd
, NULL
, 0);
973 EXPORT_SYMBOL(transport_set_vpd_ident
);
976 target_cmd_size_check(struct se_cmd
*cmd
, unsigned int size
)
978 struct se_device
*dev
= cmd
->se_dev
;
980 if (cmd
->unknown_data_length
) {
981 cmd
->data_length
= size
;
982 } else if (size
!= cmd
->data_length
) {
983 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
984 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
985 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
986 cmd
->data_length
, size
, cmd
->t_task_cdb
[0]);
988 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
989 pr_err("Rejecting underflow/overflow"
991 return TCM_INVALID_CDB_FIELD
;
994 * Reject READ_* or WRITE_* with overflow/underflow for
995 * type SCF_SCSI_DATA_CDB.
997 if (dev
->dev_attrib
.block_size
!= 512) {
998 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
999 " CDB on non 512-byte sector setup subsystem"
1000 " plugin: %s\n", dev
->transport
->name
);
1001 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1002 return TCM_INVALID_CDB_FIELD
;
1005 * For the overflow case keep the existing fabric provided
1006 * ->data_length. Otherwise for the underflow case, reset
1007 * ->data_length to the smaller SCSI expected data transfer
1010 if (size
> cmd
->data_length
) {
1011 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
1012 cmd
->residual_count
= (size
- cmd
->data_length
);
1014 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
1015 cmd
->residual_count
= (cmd
->data_length
- size
);
1016 cmd
->data_length
= size
;
1025 * Used by fabric modules containing a local struct se_cmd within their
1026 * fabric dependent per I/O descriptor.
1028 void transport_init_se_cmd(
1030 struct target_core_fabric_ops
*tfo
,
1031 struct se_session
*se_sess
,
1035 unsigned char *sense_buffer
)
1037 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1038 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1039 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1040 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1041 INIT_LIST_HEAD(&cmd
->state_list
);
1042 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1043 init_completion(&cmd
->transport_lun_stop_comp
);
1044 init_completion(&cmd
->t_transport_stop_comp
);
1045 init_completion(&cmd
->cmd_wait_comp
);
1046 init_completion(&cmd
->task_stop_comp
);
1047 spin_lock_init(&cmd
->t_state_lock
);
1048 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1051 cmd
->se_sess
= se_sess
;
1052 cmd
->data_length
= data_length
;
1053 cmd
->data_direction
= data_direction
;
1054 cmd
->sam_task_attr
= task_attr
;
1055 cmd
->sense_buffer
= sense_buffer
;
1057 cmd
->state_active
= false;
1059 EXPORT_SYMBOL(transport_init_se_cmd
);
1061 static sense_reason_t
1062 transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1064 struct se_device
*dev
= cmd
->se_dev
;
1067 * Check if SAM Task Attribute emulation is enabled for this
1068 * struct se_device storage object
1070 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1073 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1074 pr_debug("SAM Task Attribute ACA"
1075 " emulation is not supported\n");
1076 return TCM_INVALID_CDB_FIELD
;
1079 * Used to determine when ORDERED commands should go from
1080 * Dormant to Active status.
1082 cmd
->se_ordered_id
= atomic_inc_return(&dev
->dev_ordered_id
);
1083 smp_mb__after_atomic_inc();
1084 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1085 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1086 dev
->transport
->name
);
1091 target_setup_cmd_from_cdb(struct se_cmd
*cmd
, unsigned char *cdb
)
1093 struct se_device
*dev
= cmd
->se_dev
;
1094 unsigned long flags
;
1098 * Ensure that the received CDB is less than the max (252 + 8) bytes
1099 * for VARIABLE_LENGTH_CMD
1101 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1102 pr_err("Received SCSI CDB with command_size: %d that"
1103 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1104 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1105 return TCM_INVALID_CDB_FIELD
;
1108 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1109 * allocate the additional extended CDB buffer now.. Otherwise
1110 * setup the pointer from __t_task_cdb to t_task_cdb.
1112 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1113 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1115 if (!cmd
->t_task_cdb
) {
1116 pr_err("Unable to allocate cmd->t_task_cdb"
1117 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1118 scsi_command_size(cdb
),
1119 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1120 return TCM_OUT_OF_RESOURCES
;
1123 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1125 * Copy the original CDB into cmd->
1127 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1130 * Check for an existing UNIT ATTENTION condition
1132 ret
= target_scsi3_ua_check(cmd
);
1136 ret
= target_alua_state_check(cmd
);
1140 ret
= target_check_reservation(cmd
);
1142 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1146 ret
= dev
->transport
->parse_cdb(cmd
);
1150 ret
= transport_check_alloc_task_attr(cmd
);
1154 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1155 cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1156 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1158 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1159 if (cmd
->se_lun
->lun_sep
)
1160 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1161 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1164 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1167 * Used by fabric module frontends to queue tasks directly.
1168 * Many only be used from process context only
1170 int transport_handle_cdb_direct(
1177 pr_err("cmd->se_lun is NULL\n");
1180 if (in_interrupt()) {
1182 pr_err("transport_generic_handle_cdb cannot be called"
1183 " from interrupt context\n");
1187 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1188 * outstanding descriptors are handled correctly during shutdown via
1189 * transport_wait_for_tasks()
1191 * Also, we don't take cmd->t_state_lock here as we only expect
1192 * this to be called for initial descriptor submission.
1194 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1195 cmd
->transport_state
|= CMD_T_ACTIVE
;
1198 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1199 * so follow TRANSPORT_NEW_CMD processing thread context usage
1200 * and call transport_generic_request_failure() if necessary..
1202 ret
= transport_generic_new_cmd(cmd
);
1204 transport_generic_request_failure(cmd
, ret
);
1207 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1209 static sense_reason_t
1210 transport_generic_map_mem_to_cmd(struct se_cmd
*cmd
, struct scatterlist
*sgl
,
1211 u32 sgl_count
, struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
)
1213 if (!sgl
|| !sgl_count
)
1217 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1218 * scatterlists already have been set to follow what the fabric
1219 * passes for the original expected data transfer length.
1221 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
1222 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1223 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1224 return TCM_INVALID_CDB_FIELD
;
1227 cmd
->t_data_sg
= sgl
;
1228 cmd
->t_data_nents
= sgl_count
;
1230 if (sgl_bidi
&& sgl_bidi_count
) {
1231 cmd
->t_bidi_data_sg
= sgl_bidi
;
1232 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
1234 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
1239 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1240 * se_cmd + use pre-allocated SGL memory.
1242 * @se_cmd: command descriptor to submit
1243 * @se_sess: associated se_sess for endpoint
1244 * @cdb: pointer to SCSI CDB
1245 * @sense: pointer to SCSI sense buffer
1246 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1247 * @data_length: fabric expected data transfer length
1248 * @task_addr: SAM task attribute
1249 * @data_dir: DMA data direction
1250 * @flags: flags for command submission from target_sc_flags_tables
1251 * @sgl: struct scatterlist memory for unidirectional mapping
1252 * @sgl_count: scatterlist count for unidirectional mapping
1253 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1254 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1256 * Returns non zero to signal active I/O shutdown failure. All other
1257 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1258 * but still return zero here.
1260 * This may only be called from process context, and also currently
1261 * assumes internal allocation of fabric payload buffer by target-core.
1263 int target_submit_cmd_map_sgls(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1264 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1265 u32 data_length
, int task_attr
, int data_dir
, int flags
,
1266 struct scatterlist
*sgl
, u32 sgl_count
,
1267 struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
)
1269 struct se_portal_group
*se_tpg
;
1273 se_tpg
= se_sess
->se_tpg
;
1275 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1276 BUG_ON(in_interrupt());
1278 * Initialize se_cmd for target operation. From this point
1279 * exceptions are handled by sending exception status via
1280 * target_core_fabric_ops->queue_status() callback
1282 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1283 data_length
, data_dir
, task_attr
, sense
);
1284 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1285 se_cmd
->unknown_data_length
= 1;
1287 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1288 * se_sess->sess_cmd_list. A second kref_get here is necessary
1289 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1290 * kref_put() to happen during fabric packet acknowledgement.
1292 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1296 * Signal bidirectional data payloads to target-core
1298 if (flags
& TARGET_SCF_BIDI_OP
)
1299 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1301 * Locate se_lun pointer and attach it to struct se_cmd
1303 rc
= transport_lookup_cmd_lun(se_cmd
, unpacked_lun
);
1305 transport_send_check_condition_and_sense(se_cmd
, rc
, 0);
1306 target_put_sess_cmd(se_sess
, se_cmd
);
1310 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1312 transport_generic_request_failure(se_cmd
, rc
);
1316 * When a non zero sgl_count has been passed perform SGL passthrough
1317 * mapping for pre-allocated fabric memory instead of having target
1318 * core perform an internal SGL allocation..
1320 if (sgl_count
!= 0) {
1324 * A work-around for tcm_loop as some userspace code via
1325 * scsi-generic do not memset their associated read buffers,
1326 * so go ahead and do that here for type non-data CDBs. Also
1327 * note that this is currently guaranteed to be a single SGL
1328 * for this case by target core in target_setup_cmd_from_cdb()
1329 * -> transport_generic_cmd_sequencer().
1331 if (!(se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) &&
1332 se_cmd
->data_direction
== DMA_FROM_DEVICE
) {
1333 unsigned char *buf
= NULL
;
1336 buf
= kmap(sg_page(sgl
)) + sgl
->offset
;
1339 memset(buf
, 0, sgl
->length
);
1340 kunmap(sg_page(sgl
));
1344 rc
= transport_generic_map_mem_to_cmd(se_cmd
, sgl
, sgl_count
,
1345 sgl_bidi
, sgl_bidi_count
);
1347 transport_generic_request_failure(se_cmd
, rc
);
1352 * Check if we need to delay processing because of ALUA
1353 * Active/NonOptimized primary access state..
1355 core_alua_check_nonop_delay(se_cmd
);
1357 transport_handle_cdb_direct(se_cmd
);
1360 EXPORT_SYMBOL(target_submit_cmd_map_sgls
);
1363 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1365 * @se_cmd: command descriptor to submit
1366 * @se_sess: associated se_sess for endpoint
1367 * @cdb: pointer to SCSI CDB
1368 * @sense: pointer to SCSI sense buffer
1369 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1370 * @data_length: fabric expected data transfer length
1371 * @task_addr: SAM task attribute
1372 * @data_dir: DMA data direction
1373 * @flags: flags for command submission from target_sc_flags_tables
1375 * Returns non zero to signal active I/O shutdown failure. All other
1376 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1377 * but still return zero here.
1379 * This may only be called from process context, and also currently
1380 * assumes internal allocation of fabric payload buffer by target-core.
1382 * It also assumes interal target core SGL memory allocation.
1384 int target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1385 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1386 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1388 return target_submit_cmd_map_sgls(se_cmd
, se_sess
, cdb
, sense
,
1389 unpacked_lun
, data_length
, task_attr
, data_dir
,
1390 flags
, NULL
, 0, NULL
, 0);
1392 EXPORT_SYMBOL(target_submit_cmd
);
1394 static void target_complete_tmr_failure(struct work_struct
*work
)
1396 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1398 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1399 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1401 transport_cmd_check_stop_to_fabric(se_cmd
);
1405 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1408 * @se_cmd: command descriptor to submit
1409 * @se_sess: associated se_sess for endpoint
1410 * @sense: pointer to SCSI sense buffer
1411 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1412 * @fabric_context: fabric context for TMR req
1413 * @tm_type: Type of TM request
1414 * @gfp: gfp type for caller
1415 * @tag: referenced task tag for TMR_ABORT_TASK
1416 * @flags: submit cmd flags
1418 * Callable from all contexts.
1421 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1422 unsigned char *sense
, u32 unpacked_lun
,
1423 void *fabric_tmr_ptr
, unsigned char tm_type
,
1424 gfp_t gfp
, unsigned int tag
, int flags
)
1426 struct se_portal_group
*se_tpg
;
1429 se_tpg
= se_sess
->se_tpg
;
1432 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1433 0, DMA_NONE
, MSG_SIMPLE_TAG
, sense
);
1435 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1436 * allocation failure.
1438 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1442 if (tm_type
== TMR_ABORT_TASK
)
1443 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1445 /* See target_submit_cmd for commentary */
1446 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1448 core_tmr_release_req(se_cmd
->se_tmr_req
);
1452 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1455 * For callback during failure handling, push this work off
1456 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1458 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1459 schedule_work(&se_cmd
->work
);
1462 transport_generic_handle_tmr(se_cmd
);
1465 EXPORT_SYMBOL(target_submit_tmr
);
1468 * If the cmd is active, request it to be stopped and sleep until it
1471 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1473 bool was_active
= false;
1475 if (cmd
->transport_state
& CMD_T_BUSY
) {
1476 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1477 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1479 pr_debug("cmd %p waiting to complete\n", cmd
);
1480 wait_for_completion(&cmd
->task_stop_comp
);
1481 pr_debug("cmd %p stopped successfully\n", cmd
);
1483 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1484 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1485 cmd
->transport_state
&= ~CMD_T_BUSY
;
1493 * Handle SAM-esque emulation for generic transport request failures.
1495 void transport_generic_request_failure(struct se_cmd
*cmd
,
1496 sense_reason_t sense_reason
)
1500 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1501 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1502 cmd
->t_task_cdb
[0]);
1503 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1504 cmd
->se_tfo
->get_cmd_state(cmd
),
1505 cmd
->t_state
, sense_reason
);
1506 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1507 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1508 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1509 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1512 * For SAM Task Attribute emulation for failed struct se_cmd
1514 transport_complete_task_attr(cmd
);
1516 switch (sense_reason
) {
1517 case TCM_NON_EXISTENT_LUN
:
1518 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1519 case TCM_INVALID_CDB_FIELD
:
1520 case TCM_INVALID_PARAMETER_LIST
:
1521 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
1522 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1523 case TCM_UNKNOWN_MODE_PAGE
:
1524 case TCM_WRITE_PROTECTED
:
1525 case TCM_ADDRESS_OUT_OF_RANGE
:
1526 case TCM_CHECK_CONDITION_ABORT_CMD
:
1527 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1528 case TCM_CHECK_CONDITION_NOT_READY
:
1530 case TCM_OUT_OF_RESOURCES
:
1531 sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1533 case TCM_RESERVATION_CONFLICT
:
1535 * No SENSE Data payload for this case, set SCSI Status
1536 * and queue the response to $FABRIC_MOD.
1538 * Uses linux/include/scsi/scsi.h SAM status codes defs
1540 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1542 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1543 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1546 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1549 cmd
->se_dev
->dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1550 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1551 cmd
->orig_fe_lun
, 0x2C,
1552 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1554 ret
= cmd
->se_tfo
->queue_status(cmd
);
1555 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1559 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1560 cmd
->t_task_cdb
[0], sense_reason
);
1561 sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1565 ret
= transport_send_check_condition_and_sense(cmd
, sense_reason
, 0);
1566 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1570 transport_lun_remove_cmd(cmd
);
1571 if (!transport_cmd_check_stop_to_fabric(cmd
))
1576 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1577 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1579 EXPORT_SYMBOL(transport_generic_request_failure
);
1581 static void __target_execute_cmd(struct se_cmd
*cmd
)
1585 spin_lock_irq(&cmd
->t_state_lock
);
1586 cmd
->transport_state
|= (CMD_T_BUSY
|CMD_T_SENT
);
1587 spin_unlock_irq(&cmd
->t_state_lock
);
1589 if (cmd
->execute_cmd
) {
1590 ret
= cmd
->execute_cmd(cmd
);
1592 spin_lock_irq(&cmd
->t_state_lock
);
1593 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1594 spin_unlock_irq(&cmd
->t_state_lock
);
1596 transport_generic_request_failure(cmd
, ret
);
1601 static bool target_handle_task_attr(struct se_cmd
*cmd
)
1603 struct se_device
*dev
= cmd
->se_dev
;
1605 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1609 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1610 * to allow the passed struct se_cmd list of tasks to the front of the list.
1612 switch (cmd
->sam_task_attr
) {
1614 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1615 "se_ordered_id: %u\n",
1616 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1618 case MSG_ORDERED_TAG
:
1619 atomic_inc(&dev
->dev_ordered_sync
);
1620 smp_mb__after_atomic_inc();
1622 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1623 " se_ordered_id: %u\n",
1624 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1627 * Execute an ORDERED command if no other older commands
1628 * exist that need to be completed first.
1630 if (!atomic_read(&dev
->simple_cmds
))
1635 * For SIMPLE and UNTAGGED Task Attribute commands
1637 atomic_inc(&dev
->simple_cmds
);
1638 smp_mb__after_atomic_inc();
1642 if (atomic_read(&dev
->dev_ordered_sync
) == 0)
1645 spin_lock(&dev
->delayed_cmd_lock
);
1646 list_add_tail(&cmd
->se_delayed_node
, &dev
->delayed_cmd_list
);
1647 spin_unlock(&dev
->delayed_cmd_lock
);
1649 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1650 " delayed CMD list, se_ordered_id: %u\n",
1651 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1652 cmd
->se_ordered_id
);
1656 void target_execute_cmd(struct se_cmd
*cmd
)
1659 * If the received CDB has aleady been aborted stop processing it here.
1661 if (transport_check_aborted_status(cmd
, 1)) {
1662 complete(&cmd
->transport_lun_stop_comp
);
1667 * Determine if IOCTL context caller in requesting the stopping of this
1668 * command for LUN shutdown purposes.
1670 spin_lock_irq(&cmd
->t_state_lock
);
1671 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
1672 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1673 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
1675 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
1676 spin_unlock_irq(&cmd
->t_state_lock
);
1677 complete(&cmd
->transport_lun_stop_comp
);
1681 * Determine if frontend context caller is requesting the stopping of
1682 * this command for frontend exceptions.
1684 if (cmd
->transport_state
& CMD_T_STOP
) {
1685 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1687 cmd
->se_tfo
->get_task_tag(cmd
));
1689 spin_unlock_irq(&cmd
->t_state_lock
);
1690 complete(&cmd
->t_transport_stop_comp
);
1694 cmd
->t_state
= TRANSPORT_PROCESSING
;
1695 cmd
->transport_state
|= CMD_T_ACTIVE
;
1696 spin_unlock_irq(&cmd
->t_state_lock
);
1698 if (!target_handle_task_attr(cmd
))
1699 __target_execute_cmd(cmd
);
1701 EXPORT_SYMBOL(target_execute_cmd
);
1704 * Process all commands up to the last received ORDERED task attribute which
1705 * requires another blocking boundary
1707 static void target_restart_delayed_cmds(struct se_device
*dev
)
1712 spin_lock(&dev
->delayed_cmd_lock
);
1713 if (list_empty(&dev
->delayed_cmd_list
)) {
1714 spin_unlock(&dev
->delayed_cmd_lock
);
1718 cmd
= list_entry(dev
->delayed_cmd_list
.next
,
1719 struct se_cmd
, se_delayed_node
);
1720 list_del(&cmd
->se_delayed_node
);
1721 spin_unlock(&dev
->delayed_cmd_lock
);
1723 __target_execute_cmd(cmd
);
1725 if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
)
1731 * Called from I/O completion to determine which dormant/delayed
1732 * and ordered cmds need to have their tasks added to the execution queue.
1734 static void transport_complete_task_attr(struct se_cmd
*cmd
)
1736 struct se_device
*dev
= cmd
->se_dev
;
1738 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1741 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
1742 atomic_dec(&dev
->simple_cmds
);
1743 smp_mb__after_atomic_dec();
1744 dev
->dev_cur_ordered_id
++;
1745 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1746 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
1747 cmd
->se_ordered_id
);
1748 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1749 dev
->dev_cur_ordered_id
++;
1750 pr_debug("Incremented dev_cur_ordered_id: %u for"
1751 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
1752 cmd
->se_ordered_id
);
1753 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1754 atomic_dec(&dev
->dev_ordered_sync
);
1755 smp_mb__after_atomic_dec();
1757 dev
->dev_cur_ordered_id
++;
1758 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1759 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
1762 target_restart_delayed_cmds(dev
);
1765 static void transport_complete_qf(struct se_cmd
*cmd
)
1769 transport_complete_task_attr(cmd
);
1771 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1772 ret
= cmd
->se_tfo
->queue_status(cmd
);
1777 switch (cmd
->data_direction
) {
1778 case DMA_FROM_DEVICE
:
1779 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1782 if (cmd
->t_bidi_data_sg
) {
1783 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1787 /* Fall through for DMA_TO_DEVICE */
1789 ret
= cmd
->se_tfo
->queue_status(cmd
);
1797 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1800 transport_lun_remove_cmd(cmd
);
1801 transport_cmd_check_stop_to_fabric(cmd
);
1804 static void transport_handle_queue_full(
1806 struct se_device
*dev
)
1808 spin_lock_irq(&dev
->qf_cmd_lock
);
1809 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
1810 atomic_inc(&dev
->dev_qf_count
);
1811 smp_mb__after_atomic_inc();
1812 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
1814 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1817 static void target_complete_ok_work(struct work_struct
*work
)
1819 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
1823 * Check if we need to move delayed/dormant tasks from cmds on the
1824 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1827 transport_complete_task_attr(cmd
);
1830 * Check to schedule QUEUE_FULL work, or execute an existing
1831 * cmd->transport_qf_callback()
1833 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
1834 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1837 * Check if we need to send a sense buffer from
1838 * the struct se_cmd in question.
1840 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1841 WARN_ON(!cmd
->scsi_status
);
1842 ret
= transport_send_check_condition_and_sense(
1844 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1847 transport_lun_remove_cmd(cmd
);
1848 transport_cmd_check_stop_to_fabric(cmd
);
1852 * Check for a callback, used by amongst other things
1853 * XDWRITE_READ_10 emulation.
1855 if (cmd
->transport_complete_callback
)
1856 cmd
->transport_complete_callback(cmd
);
1858 switch (cmd
->data_direction
) {
1859 case DMA_FROM_DEVICE
:
1860 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1861 if (cmd
->se_lun
->lun_sep
) {
1862 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
1865 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1867 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1868 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1872 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1873 if (cmd
->se_lun
->lun_sep
) {
1874 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
1877 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1879 * Check if we need to send READ payload for BIDI-COMMAND
1881 if (cmd
->t_bidi_data_sg
) {
1882 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1883 if (cmd
->se_lun
->lun_sep
) {
1884 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
1887 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1888 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1889 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1893 /* Fall through for DMA_TO_DEVICE */
1895 ret
= cmd
->se_tfo
->queue_status(cmd
);
1896 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1903 transport_lun_remove_cmd(cmd
);
1904 transport_cmd_check_stop_to_fabric(cmd
);
1908 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
1909 " data_direction: %d\n", cmd
, cmd
->data_direction
);
1910 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1911 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1914 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
1916 struct scatterlist
*sg
;
1919 for_each_sg(sgl
, sg
, nents
, count
)
1920 __free_page(sg_page(sg
));
1925 static inline void transport_free_pages(struct se_cmd
*cmd
)
1927 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
1930 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
1931 cmd
->t_data_sg
= NULL
;
1932 cmd
->t_data_nents
= 0;
1934 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
1935 cmd
->t_bidi_data_sg
= NULL
;
1936 cmd
->t_bidi_data_nents
= 0;
1940 * transport_release_cmd - free a command
1941 * @cmd: command to free
1943 * This routine unconditionally frees a command, and reference counting
1944 * or list removal must be done in the caller.
1946 static void transport_release_cmd(struct se_cmd
*cmd
)
1948 BUG_ON(!cmd
->se_tfo
);
1950 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
1951 core_tmr_release_req(cmd
->se_tmr_req
);
1952 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
1953 kfree(cmd
->t_task_cdb
);
1955 * If this cmd has been setup with target_get_sess_cmd(), drop
1956 * the kref and call ->release_cmd() in kref callback.
1958 if (cmd
->check_release
!= 0) {
1959 target_put_sess_cmd(cmd
->se_sess
, cmd
);
1962 cmd
->se_tfo
->release_cmd(cmd
);
1966 * transport_put_cmd - release a reference to a command
1967 * @cmd: command to release
1969 * This routine releases our reference to the command and frees it if possible.
1971 static void transport_put_cmd(struct se_cmd
*cmd
)
1973 unsigned long flags
;
1975 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1976 if (atomic_read(&cmd
->t_fe_count
) &&
1977 !atomic_dec_and_test(&cmd
->t_fe_count
)) {
1978 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1982 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
1983 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
1984 target_remove_from_state_list(cmd
);
1986 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1988 transport_free_pages(cmd
);
1989 transport_release_cmd(cmd
);
1993 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
1995 struct scatterlist
*sg
= cmd
->t_data_sg
;
1996 struct page
**pages
;
2000 * We need to take into account a possible offset here for fabrics like
2001 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2002 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2004 if (!cmd
->t_data_nents
)
2008 if (cmd
->t_data_nents
== 1)
2009 return kmap(sg_page(sg
)) + sg
->offset
;
2011 /* >1 page. use vmap */
2012 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
2016 /* convert sg[] to pages[] */
2017 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
2018 pages
[i
] = sg_page(sg
);
2021 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
2023 if (!cmd
->t_data_vmap
)
2026 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
2028 EXPORT_SYMBOL(transport_kmap_data_sg
);
2030 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
2032 if (!cmd
->t_data_nents
) {
2034 } else if (cmd
->t_data_nents
== 1) {
2035 kunmap(sg_page(cmd
->t_data_sg
));
2039 vunmap(cmd
->t_data_vmap
);
2040 cmd
->t_data_vmap
= NULL
;
2042 EXPORT_SYMBOL(transport_kunmap_data_sg
);
2045 transport_generic_get_mem(struct se_cmd
*cmd
)
2047 u32 length
= cmd
->data_length
;
2053 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
2054 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
2055 if (!cmd
->t_data_sg
)
2058 cmd
->t_data_nents
= nents
;
2059 sg_init_table(cmd
->t_data_sg
, nents
);
2061 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
? 0 : __GFP_ZERO
;
2064 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
2065 page
= alloc_page(GFP_KERNEL
| zero_flag
);
2069 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
2078 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
2080 kfree(cmd
->t_data_sg
);
2081 cmd
->t_data_sg
= NULL
;
2086 * Allocate any required resources to execute the command. For writes we
2087 * might not have the payload yet, so notify the fabric via a call to
2088 * ->write_pending instead. Otherwise place it on the execution queue.
2091 transport_generic_new_cmd(struct se_cmd
*cmd
)
2096 * Determine is the TCM fabric module has already allocated physical
2097 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2100 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
2102 ret
= transport_generic_get_mem(cmd
);
2104 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2107 atomic_inc(&cmd
->t_fe_count
);
2110 * If this command is not a write we can execute it right here,
2111 * for write buffers we need to notify the fabric driver first
2112 * and let it call back once the write buffers are ready.
2114 target_add_to_state_list(cmd
);
2115 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
2116 target_execute_cmd(cmd
);
2120 spin_lock_irq(&cmd
->t_state_lock
);
2121 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
2122 spin_unlock_irq(&cmd
->t_state_lock
);
2124 transport_cmd_check_stop(cmd
, false);
2126 ret
= cmd
->se_tfo
->write_pending(cmd
);
2127 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2130 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2133 return (!ret
) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2136 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
2137 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
2138 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2141 EXPORT_SYMBOL(transport_generic_new_cmd
);
2143 static void transport_write_pending_qf(struct se_cmd
*cmd
)
2147 ret
= cmd
->se_tfo
->write_pending(cmd
);
2148 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
2149 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2151 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2155 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
2157 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
2158 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
2159 transport_wait_for_tasks(cmd
);
2161 transport_release_cmd(cmd
);
2164 transport_wait_for_tasks(cmd
);
2167 transport_lun_remove_cmd(cmd
);
2169 transport_put_cmd(cmd
);
2172 EXPORT_SYMBOL(transport_generic_free_cmd
);
2174 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2175 * @se_sess: session to reference
2176 * @se_cmd: command descriptor to add
2177 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2179 int target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
2182 unsigned long flags
;
2185 kref_init(&se_cmd
->cmd_kref
);
2187 * Add a second kref if the fabric caller is expecting to handle
2188 * fabric acknowledgement that requires two target_put_sess_cmd()
2189 * invocations before se_cmd descriptor release.
2191 if (ack_kref
== true) {
2192 kref_get(&se_cmd
->cmd_kref
);
2193 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
2196 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2197 if (se_sess
->sess_tearing_down
) {
2201 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
2202 se_cmd
->check_release
= 1;
2205 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2208 EXPORT_SYMBOL(target_get_sess_cmd
);
2210 static void target_release_cmd_kref(struct kref
*kref
)
2212 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
2213 struct se_session
*se_sess
= se_cmd
->se_sess
;
2215 if (list_empty(&se_cmd
->se_cmd_list
)) {
2216 spin_unlock(&se_sess
->sess_cmd_lock
);
2217 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2220 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
2221 spin_unlock(&se_sess
->sess_cmd_lock
);
2222 complete(&se_cmd
->cmd_wait_comp
);
2225 list_del(&se_cmd
->se_cmd_list
);
2226 spin_unlock(&se_sess
->sess_cmd_lock
);
2228 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2231 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2232 * @se_sess: session to reference
2233 * @se_cmd: command descriptor to drop
2235 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
2237 return kref_put_spinlock_irqsave(&se_cmd
->cmd_kref
, target_release_cmd_kref
,
2238 &se_sess
->sess_cmd_lock
);
2240 EXPORT_SYMBOL(target_put_sess_cmd
);
2242 /* target_sess_cmd_list_set_waiting - Flag all commands in
2243 * sess_cmd_list to complete cmd_wait_comp. Set
2244 * sess_tearing_down so no more commands are queued.
2245 * @se_sess: session to flag
2247 void target_sess_cmd_list_set_waiting(struct se_session
*se_sess
)
2249 struct se_cmd
*se_cmd
;
2250 unsigned long flags
;
2252 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2254 WARN_ON(se_sess
->sess_tearing_down
);
2255 se_sess
->sess_tearing_down
= 1;
2257 list_for_each_entry(se_cmd
, &se_sess
->sess_cmd_list
, se_cmd_list
)
2258 se_cmd
->cmd_wait_set
= 1;
2260 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2262 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting
);
2264 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2265 * @se_sess: session to wait for active I/O
2267 void target_wait_for_sess_cmds(struct se_session
*se_sess
)
2269 struct se_cmd
*se_cmd
, *tmp_cmd
;
2271 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
2272 &se_sess
->sess_cmd_list
, se_cmd_list
) {
2273 list_del(&se_cmd
->se_cmd_list
);
2275 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2276 " %d\n", se_cmd
, se_cmd
->t_state
,
2277 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2279 wait_for_completion(&se_cmd
->cmd_wait_comp
);
2280 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2281 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2282 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2284 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2287 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
2289 /* transport_lun_wait_for_tasks():
2291 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2292 * an struct se_lun to be successfully shutdown.
2294 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
2296 unsigned long flags
;
2300 * If the frontend has already requested this struct se_cmd to
2301 * be stopped, we can safely ignore this struct se_cmd.
2303 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2304 if (cmd
->transport_state
& CMD_T_STOP
) {
2305 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
2307 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2308 cmd
->se_tfo
->get_task_tag(cmd
));
2309 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2310 transport_cmd_check_stop(cmd
, false);
2313 cmd
->transport_state
|= CMD_T_LUN_FE_STOP
;
2314 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2316 // XXX: audit task_flags checks.
2317 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2318 if ((cmd
->transport_state
& CMD_T_BUSY
) &&
2319 (cmd
->transport_state
& CMD_T_SENT
)) {
2320 if (!target_stop_cmd(cmd
, &flags
))
2323 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2325 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2328 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2329 cmd
->se_tfo
->get_task_tag(cmd
));
2330 wait_for_completion(&cmd
->transport_lun_stop_comp
);
2331 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2332 cmd
->se_tfo
->get_task_tag(cmd
));
2338 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
2340 struct se_cmd
*cmd
= NULL
;
2341 unsigned long lun_flags
, cmd_flags
;
2343 * Do exception processing and return CHECK_CONDITION status to the
2346 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2347 while (!list_empty(&lun
->lun_cmd_list
)) {
2348 cmd
= list_first_entry(&lun
->lun_cmd_list
,
2349 struct se_cmd
, se_lun_node
);
2350 list_del_init(&cmd
->se_lun_node
);
2352 spin_lock(&cmd
->t_state_lock
);
2353 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2354 "_lun_stop for ITT: 0x%08x\n",
2355 cmd
->se_lun
->unpacked_lun
,
2356 cmd
->se_tfo
->get_task_tag(cmd
));
2357 cmd
->transport_state
|= CMD_T_LUN_STOP
;
2358 spin_unlock(&cmd
->t_state_lock
);
2360 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
2363 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2364 cmd
->se_tfo
->get_task_tag(cmd
),
2365 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2369 * If the Storage engine still owns the iscsi_cmd_t, determine
2370 * and/or stop its context.
2372 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2373 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
2374 cmd
->se_tfo
->get_task_tag(cmd
));
2376 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
2377 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2381 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2382 "_wait_for_tasks(): SUCCESS\n",
2383 cmd
->se_lun
->unpacked_lun
,
2384 cmd
->se_tfo
->get_task_tag(cmd
));
2386 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
2387 if (!(cmd
->transport_state
& CMD_T_DEV_ACTIVE
)) {
2388 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2391 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
2392 target_remove_from_state_list(cmd
);
2393 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2396 * The Storage engine stopped this struct se_cmd before it was
2397 * send to the fabric frontend for delivery back to the
2398 * Initiator Node. Return this SCSI CDB back with an
2399 * CHECK_CONDITION status.
2402 transport_send_check_condition_and_sense(cmd
,
2403 TCM_NON_EXISTENT_LUN
, 0);
2405 * If the fabric frontend is waiting for this iscsi_cmd_t to
2406 * be released, notify the waiting thread now that LU has
2407 * finished accessing it.
2409 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
2410 if (cmd
->transport_state
& CMD_T_LUN_FE_STOP
) {
2411 pr_debug("SE_LUN[%d] - Detected FE stop for"
2412 " struct se_cmd: %p ITT: 0x%08x\n",
2414 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
2416 spin_unlock_irqrestore(&cmd
->t_state_lock
,
2418 transport_cmd_check_stop(cmd
, false);
2419 complete(&cmd
->transport_lun_fe_stop_comp
);
2420 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2423 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2424 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
2426 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2427 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2429 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
2432 static int transport_clear_lun_thread(void *p
)
2434 struct se_lun
*lun
= p
;
2436 __transport_clear_lun_from_sessions(lun
);
2437 complete(&lun
->lun_shutdown_comp
);
2442 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
2444 struct task_struct
*kt
;
2446 kt
= kthread_run(transport_clear_lun_thread
, lun
,
2447 "tcm_cl_%u", lun
->unpacked_lun
);
2449 pr_err("Unable to start clear_lun thread\n");
2452 wait_for_completion(&lun
->lun_shutdown_comp
);
2458 * transport_wait_for_tasks - wait for completion to occur
2459 * @cmd: command to wait
2461 * Called from frontend fabric context to wait for storage engine
2462 * to pause and/or release frontend generated struct se_cmd.
2464 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
2466 unsigned long flags
;
2468 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2469 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
2470 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2471 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2475 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
2476 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2477 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2481 * If we are already stopped due to an external event (ie: LUN shutdown)
2482 * sleep until the connection can have the passed struct se_cmd back.
2483 * The cmd->transport_lun_stopped_sem will be upped by
2484 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2485 * has completed its operation on the struct se_cmd.
2487 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
2488 pr_debug("wait_for_tasks: Stopping"
2489 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2490 "_stop_comp); for ITT: 0x%08x\n",
2491 cmd
->se_tfo
->get_task_tag(cmd
));
2493 * There is a special case for WRITES where a FE exception +
2494 * LUN shutdown means ConfigFS context is still sleeping on
2495 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2496 * We go ahead and up transport_lun_stop_comp just to be sure
2499 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2500 complete(&cmd
->transport_lun_stop_comp
);
2501 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
2502 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2504 target_remove_from_state_list(cmd
);
2506 * At this point, the frontend who was the originator of this
2507 * struct se_cmd, now owns the structure and can be released through
2508 * normal means below.
2510 pr_debug("wait_for_tasks: Stopped"
2511 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2512 "stop_comp); for ITT: 0x%08x\n",
2513 cmd
->se_tfo
->get_task_tag(cmd
));
2515 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
2518 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
2519 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2523 cmd
->transport_state
|= CMD_T_STOP
;
2525 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2526 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2527 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
2528 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2530 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2532 wait_for_completion(&cmd
->t_transport_stop_comp
);
2534 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2535 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
2537 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2538 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2539 cmd
->se_tfo
->get_task_tag(cmd
));
2541 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2545 EXPORT_SYMBOL(transport_wait_for_tasks
);
2547 static int transport_get_sense_codes(
2552 *asc
= cmd
->scsi_asc
;
2553 *ascq
= cmd
->scsi_ascq
;
2559 transport_send_check_condition_and_sense(struct se_cmd
*cmd
,
2560 sense_reason_t reason
, int from_transport
)
2562 unsigned char *buffer
= cmd
->sense_buffer
;
2563 unsigned long flags
;
2564 u8 asc
= 0, ascq
= 0;
2566 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2567 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2568 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2571 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
2572 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2574 if (!reason
&& from_transport
)
2577 if (!from_transport
)
2578 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
2581 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2582 * SENSE KEY values from include/scsi/scsi.h
2588 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2590 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2591 /* NO ADDITIONAL SENSE INFORMATION */
2592 buffer
[SPC_ASC_KEY_OFFSET
] = 0;
2593 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0;
2595 case TCM_NON_EXISTENT_LUN
:
2598 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2599 /* ILLEGAL REQUEST */
2600 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2601 /* LOGICAL UNIT NOT SUPPORTED */
2602 buffer
[SPC_ASC_KEY_OFFSET
] = 0x25;
2604 case TCM_UNSUPPORTED_SCSI_OPCODE
:
2605 case TCM_SECTOR_COUNT_TOO_MANY
:
2608 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2609 /* ILLEGAL REQUEST */
2610 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2611 /* INVALID COMMAND OPERATION CODE */
2612 buffer
[SPC_ASC_KEY_OFFSET
] = 0x20;
2614 case TCM_UNKNOWN_MODE_PAGE
:
2617 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2618 /* ILLEGAL REQUEST */
2619 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2620 /* INVALID FIELD IN CDB */
2621 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2623 case TCM_CHECK_CONDITION_ABORT_CMD
:
2626 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2627 /* ABORTED COMMAND */
2628 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2629 /* BUS DEVICE RESET FUNCTION OCCURRED */
2630 buffer
[SPC_ASC_KEY_OFFSET
] = 0x29;
2631 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2633 case TCM_INCORRECT_AMOUNT_OF_DATA
:
2636 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2637 /* ABORTED COMMAND */
2638 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2640 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2641 /* NOT ENOUGH UNSOLICITED DATA */
2642 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0d;
2644 case TCM_INVALID_CDB_FIELD
:
2647 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2648 /* ILLEGAL REQUEST */
2649 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2650 /* INVALID FIELD IN CDB */
2651 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2653 case TCM_INVALID_PARAMETER_LIST
:
2656 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2657 /* ILLEGAL REQUEST */
2658 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2659 /* INVALID FIELD IN PARAMETER LIST */
2660 buffer
[SPC_ASC_KEY_OFFSET
] = 0x26;
2662 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
2665 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2666 /* ILLEGAL REQUEST */
2667 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2668 /* PARAMETER LIST LENGTH ERROR */
2669 buffer
[SPC_ASC_KEY_OFFSET
] = 0x1a;
2671 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
2674 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2675 /* ABORTED COMMAND */
2676 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2678 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2679 /* UNEXPECTED_UNSOLICITED_DATA */
2680 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0c;
2682 case TCM_SERVICE_CRC_ERROR
:
2685 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2686 /* ABORTED COMMAND */
2687 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2688 /* PROTOCOL SERVICE CRC ERROR */
2689 buffer
[SPC_ASC_KEY_OFFSET
] = 0x47;
2691 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x05;
2693 case TCM_SNACK_REJECTED
:
2696 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2697 /* ABORTED COMMAND */
2698 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2700 buffer
[SPC_ASC_KEY_OFFSET
] = 0x11;
2701 /* FAILED RETRANSMISSION REQUEST */
2702 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x13;
2704 case TCM_WRITE_PROTECTED
:
2707 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2709 buffer
[SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
2710 /* WRITE PROTECTED */
2711 buffer
[SPC_ASC_KEY_OFFSET
] = 0x27;
2713 case TCM_ADDRESS_OUT_OF_RANGE
:
2716 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2717 /* ILLEGAL REQUEST */
2718 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2719 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2720 buffer
[SPC_ASC_KEY_OFFSET
] = 0x21;
2722 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
2725 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2726 /* UNIT ATTENTION */
2727 buffer
[SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
2728 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
2729 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2730 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2732 case TCM_CHECK_CONDITION_NOT_READY
:
2735 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2737 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2738 transport_get_sense_codes(cmd
, &asc
, &ascq
);
2739 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2740 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2742 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
2746 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2748 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2749 * Solaris initiators. Returning NOT READY instead means the
2750 * operations will be retried a finite number of times and we
2751 * can survive intermittent errors.
2753 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2754 /* LOGICAL UNIT COMMUNICATION FAILURE */
2755 buffer
[SPC_ASC_KEY_OFFSET
] = 0x08;
2759 * This code uses linux/include/scsi/scsi.h SAM status codes!
2761 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
2763 * Automatically padded, this value is encoded in the fabric's
2764 * data_length response PDU containing the SCSI defined sense data.
2766 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
2769 return cmd
->se_tfo
->queue_status(cmd
);
2771 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
2773 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
2775 if (!(cmd
->transport_state
& CMD_T_ABORTED
))
2778 if (!send_status
|| (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
2781 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2782 cmd
->t_task_cdb
[0], cmd
->se_tfo
->get_task_tag(cmd
));
2784 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
2785 cmd
->se_tfo
->queue_status(cmd
);
2789 EXPORT_SYMBOL(transport_check_aborted_status
);
2791 void transport_send_task_abort(struct se_cmd
*cmd
)
2793 unsigned long flags
;
2795 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2796 if (cmd
->se_cmd_flags
& (SCF_SENT_CHECK_CONDITION
| SCF_SENT_DELAYED_TAS
)) {
2797 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2800 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2803 * If there are still expected incoming fabric WRITEs, we wait
2804 * until until they have completed before sending a TASK_ABORTED
2805 * response. This response with TASK_ABORTED status will be
2806 * queued back to fabric module by transport_check_aborted_status().
2808 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
2809 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
2810 cmd
->transport_state
|= CMD_T_ABORTED
;
2811 smp_mb__after_atomic_inc();
2814 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
2816 transport_lun_remove_cmd(cmd
);
2818 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2819 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
2820 cmd
->se_tfo
->get_task_tag(cmd
));
2822 cmd
->se_tfo
->queue_status(cmd
);
2825 static void target_tmr_work(struct work_struct
*work
)
2827 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
2828 struct se_device
*dev
= cmd
->se_dev
;
2829 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
2832 switch (tmr
->function
) {
2833 case TMR_ABORT_TASK
:
2834 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
2836 case TMR_ABORT_TASK_SET
:
2838 case TMR_CLEAR_TASK_SET
:
2839 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
2842 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
2843 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
2844 TMR_FUNCTION_REJECTED
;
2846 case TMR_TARGET_WARM_RESET
:
2847 tmr
->response
= TMR_FUNCTION_REJECTED
;
2849 case TMR_TARGET_COLD_RESET
:
2850 tmr
->response
= TMR_FUNCTION_REJECTED
;
2853 pr_err("Uknown TMR function: 0x%02x.\n",
2855 tmr
->response
= TMR_FUNCTION_REJECTED
;
2859 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
2860 cmd
->se_tfo
->queue_tm_rsp(cmd
);
2862 transport_cmd_check_stop_to_fabric(cmd
);
2865 int transport_generic_handle_tmr(
2868 INIT_WORK(&cmd
->work
, target_tmr_work
);
2869 queue_work(cmd
->se_dev
->tmr_wq
, &cmd
->work
);
2872 EXPORT_SYMBOL(transport_generic_handle_tmr
);