1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * (c) Copyright 2002-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/net.h>
27 #include <linux/delay.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/slab.h>
31 #include <linux/spinlock.h>
32 #include <linux/kthread.h>
34 #include <linux/cdrom.h>
35 #include <linux/module.h>
36 #include <linux/ratelimit.h>
37 #include <asm/unaligned.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_tcq.h>
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
47 #include <target/target_core_configfs.h>
49 #include "target_core_internal.h"
50 #include "target_core_alua.h"
51 #include "target_core_pr.h"
52 #include "target_core_ua.h"
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/target.h>
57 static struct workqueue_struct
*target_completion_wq
;
58 static struct kmem_cache
*se_sess_cache
;
59 struct kmem_cache
*se_ua_cache
;
60 struct kmem_cache
*t10_pr_reg_cache
;
61 struct kmem_cache
*t10_alua_lu_gp_cache
;
62 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
63 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
64 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
65 struct kmem_cache
*t10_alua_lba_map_cache
;
66 struct kmem_cache
*t10_alua_lba_map_mem_cache
;
68 static void transport_complete_task_attr(struct se_cmd
*cmd
);
69 static void transport_handle_queue_full(struct se_cmd
*cmd
,
70 struct se_device
*dev
);
71 static int transport_put_cmd(struct se_cmd
*cmd
);
72 static void target_complete_ok_work(struct work_struct
*work
);
74 int init_se_kmem_caches(void)
76 se_sess_cache
= kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session
), __alignof__(struct se_session
),
80 pr_err("kmem_cache_create() for struct se_session"
84 se_ua_cache
= kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua
), __alignof__(struct se_ua
),
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
89 goto out_free_sess_cache
;
91 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration
),
93 __alignof__(struct t10_pr_registration
), 0, NULL
);
94 if (!t10_pr_reg_cache
) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
97 goto out_free_ua_cache
;
99 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
102 if (!t10_alua_lu_gp_cache
) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
105 goto out_free_pr_reg_cache
;
107 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member
),
109 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
110 if (!t10_alua_lu_gp_mem_cache
) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
113 goto out_free_lu_gp_cache
;
115 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp
),
117 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
118 if (!t10_alua_tg_pt_gp_cache
) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
121 goto out_free_lu_gp_mem_cache
;
123 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member
),
126 __alignof__(struct t10_alua_tg_pt_gp_member
),
128 if (!t10_alua_tg_pt_gp_mem_cache
) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
131 goto out_free_tg_pt_gp_cache
;
133 t10_alua_lba_map_cache
= kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map
),
136 __alignof__(struct t10_alua_lba_map
), 0, NULL
);
137 if (!t10_alua_lba_map_cache
) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
140 goto out_free_tg_pt_gp_mem_cache
;
142 t10_alua_lba_map_mem_cache
= kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member
),
145 __alignof__(struct t10_alua_lba_map_member
), 0, NULL
);
146 if (!t10_alua_lba_map_mem_cache
) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
149 goto out_free_lba_map_cache
;
152 target_completion_wq
= alloc_workqueue("target_completion",
154 if (!target_completion_wq
)
155 goto out_free_lba_map_mem_cache
;
159 out_free_lba_map_mem_cache
:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache
);
161 out_free_lba_map_cache
:
162 kmem_cache_destroy(t10_alua_lba_map_cache
);
163 out_free_tg_pt_gp_mem_cache
:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
165 out_free_tg_pt_gp_cache
:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
167 out_free_lu_gp_mem_cache
:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
169 out_free_lu_gp_cache
:
170 kmem_cache_destroy(t10_alua_lu_gp_cache
);
171 out_free_pr_reg_cache
:
172 kmem_cache_destroy(t10_pr_reg_cache
);
174 kmem_cache_destroy(se_ua_cache
);
176 kmem_cache_destroy(se_sess_cache
);
181 void release_se_kmem_caches(void)
183 destroy_workqueue(target_completion_wq
);
184 kmem_cache_destroy(se_sess_cache
);
185 kmem_cache_destroy(se_ua_cache
);
186 kmem_cache_destroy(t10_pr_reg_cache
);
187 kmem_cache_destroy(t10_alua_lu_gp_cache
);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
191 kmem_cache_destroy(t10_alua_lba_map_cache
);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache
);
195 /* This code ensures unique mib indexes are handed out. */
196 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
197 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
200 * Allocate a new row index for the entry type specified
202 u32
scsi_get_new_index(scsi_index_t type
)
206 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
208 spin_lock(&scsi_mib_index_lock
);
209 new_index
= ++scsi_mib_index
[type
];
210 spin_unlock(&scsi_mib_index_lock
);
215 void transport_subsystem_check_init(void)
218 static int sub_api_initialized
;
220 if (sub_api_initialized
)
223 ret
= request_module("target_core_iblock");
225 pr_err("Unable to load target_core_iblock\n");
227 ret
= request_module("target_core_file");
229 pr_err("Unable to load target_core_file\n");
231 ret
= request_module("target_core_pscsi");
233 pr_err("Unable to load target_core_pscsi\n");
235 sub_api_initialized
= 1;
238 struct se_session
*transport_init_session(enum target_prot_op sup_prot_ops
)
240 struct se_session
*se_sess
;
242 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
244 pr_err("Unable to allocate struct se_session from"
246 return ERR_PTR(-ENOMEM
);
248 INIT_LIST_HEAD(&se_sess
->sess_list
);
249 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
250 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
251 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
252 spin_lock_init(&se_sess
->sess_cmd_lock
);
253 kref_init(&se_sess
->sess_kref
);
254 se_sess
->sup_prot_ops
= sup_prot_ops
;
258 EXPORT_SYMBOL(transport_init_session
);
260 int transport_alloc_session_tags(struct se_session
*se_sess
,
261 unsigned int tag_num
, unsigned int tag_size
)
265 se_sess
->sess_cmd_map
= kzalloc(tag_num
* tag_size
,
266 GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
267 if (!se_sess
->sess_cmd_map
) {
268 se_sess
->sess_cmd_map
= vzalloc(tag_num
* tag_size
);
269 if (!se_sess
->sess_cmd_map
) {
270 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
275 rc
= percpu_ida_init(&se_sess
->sess_tag_pool
, tag_num
);
277 pr_err("Unable to init se_sess->sess_tag_pool,"
278 " tag_num: %u\n", tag_num
);
279 if (is_vmalloc_addr(se_sess
->sess_cmd_map
))
280 vfree(se_sess
->sess_cmd_map
);
282 kfree(se_sess
->sess_cmd_map
);
283 se_sess
->sess_cmd_map
= NULL
;
289 EXPORT_SYMBOL(transport_alloc_session_tags
);
291 struct se_session
*transport_init_session_tags(unsigned int tag_num
,
292 unsigned int tag_size
,
293 enum target_prot_op sup_prot_ops
)
295 struct se_session
*se_sess
;
298 se_sess
= transport_init_session(sup_prot_ops
);
302 rc
= transport_alloc_session_tags(se_sess
, tag_num
, tag_size
);
304 transport_free_session(se_sess
);
305 return ERR_PTR(-ENOMEM
);
310 EXPORT_SYMBOL(transport_init_session_tags
);
313 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
315 void __transport_register_session(
316 struct se_portal_group
*se_tpg
,
317 struct se_node_acl
*se_nacl
,
318 struct se_session
*se_sess
,
319 void *fabric_sess_ptr
)
321 unsigned char buf
[PR_REG_ISID_LEN
];
323 se_sess
->se_tpg
= se_tpg
;
324 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
326 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
328 * Only set for struct se_session's that will actually be moving I/O.
329 * eg: *NOT* discovery sessions.
333 * If the fabric module supports an ISID based TransportID,
334 * save this value in binary from the fabric I_T Nexus now.
336 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
337 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
338 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
339 &buf
[0], PR_REG_ISID_LEN
);
340 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
342 kref_get(&se_nacl
->acl_kref
);
344 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
346 * The se_nacl->nacl_sess pointer will be set to the
347 * last active I_T Nexus for each struct se_node_acl.
349 se_nacl
->nacl_sess
= se_sess
;
351 list_add_tail(&se_sess
->sess_acl_list
,
352 &se_nacl
->acl_sess_list
);
353 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
355 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
357 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
358 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
360 EXPORT_SYMBOL(__transport_register_session
);
362 void transport_register_session(
363 struct se_portal_group
*se_tpg
,
364 struct se_node_acl
*se_nacl
,
365 struct se_session
*se_sess
,
366 void *fabric_sess_ptr
)
370 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
371 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
372 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
374 EXPORT_SYMBOL(transport_register_session
);
376 static void target_release_session(struct kref
*kref
)
378 struct se_session
*se_sess
= container_of(kref
,
379 struct se_session
, sess_kref
);
380 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
382 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
385 void target_get_session(struct se_session
*se_sess
)
387 kref_get(&se_sess
->sess_kref
);
389 EXPORT_SYMBOL(target_get_session
);
391 void target_put_session(struct se_session
*se_sess
)
393 struct se_portal_group
*tpg
= se_sess
->se_tpg
;
395 if (tpg
->se_tpg_tfo
->put_session
!= NULL
) {
396 tpg
->se_tpg_tfo
->put_session(se_sess
);
399 kref_put(&se_sess
->sess_kref
, target_release_session
);
401 EXPORT_SYMBOL(target_put_session
);
403 static void target_complete_nacl(struct kref
*kref
)
405 struct se_node_acl
*nacl
= container_of(kref
,
406 struct se_node_acl
, acl_kref
);
408 complete(&nacl
->acl_free_comp
);
411 void target_put_nacl(struct se_node_acl
*nacl
)
413 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
416 void transport_deregister_session_configfs(struct se_session
*se_sess
)
418 struct se_node_acl
*se_nacl
;
421 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
423 se_nacl
= se_sess
->se_node_acl
;
425 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
426 if (se_nacl
->acl_stop
== 0)
427 list_del(&se_sess
->sess_acl_list
);
429 * If the session list is empty, then clear the pointer.
430 * Otherwise, set the struct se_session pointer from the tail
431 * element of the per struct se_node_acl active session list.
433 if (list_empty(&se_nacl
->acl_sess_list
))
434 se_nacl
->nacl_sess
= NULL
;
436 se_nacl
->nacl_sess
= container_of(
437 se_nacl
->acl_sess_list
.prev
,
438 struct se_session
, sess_acl_list
);
440 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
443 EXPORT_SYMBOL(transport_deregister_session_configfs
);
445 void transport_free_session(struct se_session
*se_sess
)
447 if (se_sess
->sess_cmd_map
) {
448 percpu_ida_destroy(&se_sess
->sess_tag_pool
);
449 if (is_vmalloc_addr(se_sess
->sess_cmd_map
))
450 vfree(se_sess
->sess_cmd_map
);
452 kfree(se_sess
->sess_cmd_map
);
454 kmem_cache_free(se_sess_cache
, se_sess
);
456 EXPORT_SYMBOL(transport_free_session
);
458 void transport_deregister_session(struct se_session
*se_sess
)
460 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
461 struct target_core_fabric_ops
*se_tfo
;
462 struct se_node_acl
*se_nacl
;
464 bool comp_nacl
= true;
467 transport_free_session(se_sess
);
470 se_tfo
= se_tpg
->se_tpg_tfo
;
472 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
473 list_del(&se_sess
->sess_list
);
474 se_sess
->se_tpg
= NULL
;
475 se_sess
->fabric_sess_ptr
= NULL
;
476 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
479 * Determine if we need to do extra work for this initiator node's
480 * struct se_node_acl if it had been previously dynamically generated.
482 se_nacl
= se_sess
->se_node_acl
;
484 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
485 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
486 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
487 list_del(&se_nacl
->acl_list
);
488 se_tpg
->num_node_acls
--;
489 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
490 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
491 core_free_device_list_for_node(se_nacl
, se_tpg
);
492 se_tfo
->tpg_release_fabric_acl(se_tpg
, se_nacl
);
495 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
498 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
500 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
501 se_tpg
->se_tpg_tfo
->get_fabric_name());
503 * If last kref is dropping now for an explicit NodeACL, awake sleeping
504 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
507 if (se_nacl
&& comp_nacl
)
508 target_put_nacl(se_nacl
);
510 transport_free_session(se_sess
);
512 EXPORT_SYMBOL(transport_deregister_session
);
515 * Called with cmd->t_state_lock held.
517 static void target_remove_from_state_list(struct se_cmd
*cmd
)
519 struct se_device
*dev
= cmd
->se_dev
;
525 if (cmd
->transport_state
& CMD_T_BUSY
)
528 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
529 if (cmd
->state_active
) {
530 list_del(&cmd
->state_list
);
531 cmd
->state_active
= false;
533 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
536 static int transport_cmd_check_stop(struct se_cmd
*cmd
, bool remove_from_lists
,
541 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
543 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
545 if (remove_from_lists
) {
546 target_remove_from_state_list(cmd
);
549 * Clear struct se_cmd->se_lun before the handoff to FE.
555 * Determine if frontend context caller is requesting the stopping of
556 * this command for frontend exceptions.
558 if (cmd
->transport_state
& CMD_T_STOP
) {
559 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
561 cmd
->se_tfo
->get_task_tag(cmd
));
563 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
565 complete_all(&cmd
->t_transport_stop_comp
);
569 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
570 if (remove_from_lists
) {
572 * Some fabric modules like tcm_loop can release
573 * their internally allocated I/O reference now and
576 * Fabric modules are expected to return '1' here if the
577 * se_cmd being passed is released at this point,
578 * or zero if not being released.
580 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
581 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
582 return cmd
->se_tfo
->check_stop_free(cmd
);
586 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
590 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
592 return transport_cmd_check_stop(cmd
, true, false);
595 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
597 struct se_lun
*lun
= cmd
->se_lun
;
602 if (cmpxchg(&cmd
->lun_ref_active
, true, false))
603 percpu_ref_put(&lun
->lun_ref
);
606 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
608 if (cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)
609 transport_lun_remove_cmd(cmd
);
611 * Allow the fabric driver to unmap any resources before
612 * releasing the descriptor via TFO->release_cmd()
615 cmd
->se_tfo
->aborted_task(cmd
);
617 if (transport_cmd_check_stop_to_fabric(cmd
))
620 transport_put_cmd(cmd
);
623 static void target_complete_failure_work(struct work_struct
*work
)
625 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
627 transport_generic_request_failure(cmd
,
628 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
);
632 * Used when asking transport to copy Sense Data from the underlying
633 * Linux/SCSI struct scsi_cmnd
635 static unsigned char *transport_get_sense_buffer(struct se_cmd
*cmd
)
637 struct se_device
*dev
= cmd
->se_dev
;
639 WARN_ON(!cmd
->se_lun
);
644 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
)
647 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
649 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
650 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
651 return cmd
->sense_buffer
;
654 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
656 struct se_device
*dev
= cmd
->se_dev
;
657 int success
= scsi_status
== GOOD
;
660 cmd
->scsi_status
= scsi_status
;
663 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
664 cmd
->transport_state
&= ~CMD_T_BUSY
;
666 if (dev
&& dev
->transport
->transport_complete
) {
667 dev
->transport
->transport_complete(cmd
,
669 transport_get_sense_buffer(cmd
));
670 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
675 * See if we are waiting to complete for an exception condition.
677 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
678 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
679 complete(&cmd
->task_stop_comp
);
684 * Check for case where an explicit ABORT_TASK has been received
685 * and transport_wait_for_tasks() will be waiting for completion..
687 if (cmd
->transport_state
& CMD_T_ABORTED
&&
688 cmd
->transport_state
& CMD_T_STOP
) {
689 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
690 complete_all(&cmd
->t_transport_stop_comp
);
692 } else if (!success
) {
693 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
695 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
698 cmd
->t_state
= TRANSPORT_COMPLETE
;
699 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
700 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
702 queue_work(target_completion_wq
, &cmd
->work
);
704 EXPORT_SYMBOL(target_complete_cmd
);
706 void target_complete_cmd_with_length(struct se_cmd
*cmd
, u8 scsi_status
, int length
)
708 if (scsi_status
== SAM_STAT_GOOD
&& length
< cmd
->data_length
) {
709 if (cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
710 cmd
->residual_count
+= cmd
->data_length
- length
;
712 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
713 cmd
->residual_count
= cmd
->data_length
- length
;
716 cmd
->data_length
= length
;
719 target_complete_cmd(cmd
, scsi_status
);
721 EXPORT_SYMBOL(target_complete_cmd_with_length
);
723 static void target_add_to_state_list(struct se_cmd
*cmd
)
725 struct se_device
*dev
= cmd
->se_dev
;
728 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
729 if (!cmd
->state_active
) {
730 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
731 cmd
->state_active
= true;
733 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
737 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
739 static void transport_write_pending_qf(struct se_cmd
*cmd
);
740 static void transport_complete_qf(struct se_cmd
*cmd
);
742 void target_qf_do_work(struct work_struct
*work
)
744 struct se_device
*dev
= container_of(work
, struct se_device
,
746 LIST_HEAD(qf_cmd_list
);
747 struct se_cmd
*cmd
, *cmd_tmp
;
749 spin_lock_irq(&dev
->qf_cmd_lock
);
750 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
751 spin_unlock_irq(&dev
->qf_cmd_lock
);
753 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
754 list_del(&cmd
->se_qf_node
);
755 atomic_dec(&dev
->dev_qf_count
);
756 smp_mb__after_atomic();
758 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
759 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
760 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
761 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
764 if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
)
765 transport_write_pending_qf(cmd
);
766 else if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
)
767 transport_complete_qf(cmd
);
771 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
773 switch (cmd
->data_direction
) {
776 case DMA_FROM_DEVICE
:
780 case DMA_BIDIRECTIONAL
:
789 void transport_dump_dev_state(
790 struct se_device
*dev
,
794 *bl
+= sprintf(b
+ *bl
, "Status: ");
795 if (dev
->export_count
)
796 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
798 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
800 *bl
+= sprintf(b
+ *bl
, " Max Queue Depth: %d", dev
->queue_depth
);
801 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u HwMaxSectors: %u\n",
802 dev
->dev_attrib
.block_size
,
803 dev
->dev_attrib
.hw_max_sectors
);
804 *bl
+= sprintf(b
+ *bl
, " ");
807 void transport_dump_vpd_proto_id(
809 unsigned char *p_buf
,
812 unsigned char buf
[VPD_TMP_BUF_SIZE
];
815 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
816 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
818 switch (vpd
->protocol_identifier
) {
820 sprintf(buf
+len
, "Fibre Channel\n");
823 sprintf(buf
+len
, "Parallel SCSI\n");
826 sprintf(buf
+len
, "SSA\n");
829 sprintf(buf
+len
, "IEEE 1394\n");
832 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
836 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
839 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
842 sprintf(buf
+len
, "Automation/Drive Interface Transport"
846 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
849 sprintf(buf
+len
, "Unknown 0x%02x\n",
850 vpd
->protocol_identifier
);
855 strncpy(p_buf
, buf
, p_buf_len
);
861 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
864 * Check if the Protocol Identifier Valid (PIV) bit is set..
866 * from spc3r23.pdf section 7.5.1
868 if (page_83
[1] & 0x80) {
869 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
870 vpd
->protocol_identifier_set
= 1;
871 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
874 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
876 int transport_dump_vpd_assoc(
878 unsigned char *p_buf
,
881 unsigned char buf
[VPD_TMP_BUF_SIZE
];
885 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
886 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
888 switch (vpd
->association
) {
890 sprintf(buf
+len
, "addressed logical unit\n");
893 sprintf(buf
+len
, "target port\n");
896 sprintf(buf
+len
, "SCSI target device\n");
899 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
905 strncpy(p_buf
, buf
, p_buf_len
);
912 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
915 * The VPD identification association..
917 * from spc3r23.pdf Section 7.6.3.1 Table 297
919 vpd
->association
= (page_83
[1] & 0x30);
920 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
922 EXPORT_SYMBOL(transport_set_vpd_assoc
);
924 int transport_dump_vpd_ident_type(
926 unsigned char *p_buf
,
929 unsigned char buf
[VPD_TMP_BUF_SIZE
];
933 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
934 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
936 switch (vpd
->device_identifier_type
) {
938 sprintf(buf
+len
, "Vendor specific\n");
941 sprintf(buf
+len
, "T10 Vendor ID based\n");
944 sprintf(buf
+len
, "EUI-64 based\n");
947 sprintf(buf
+len
, "NAA\n");
950 sprintf(buf
+len
, "Relative target port identifier\n");
953 sprintf(buf
+len
, "SCSI name string\n");
956 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
957 vpd
->device_identifier_type
);
963 if (p_buf_len
< strlen(buf
)+1)
965 strncpy(p_buf
, buf
, p_buf_len
);
973 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
976 * The VPD identifier type..
978 * from spc3r23.pdf Section 7.6.3.1 Table 298
980 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
981 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
983 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
985 int transport_dump_vpd_ident(
987 unsigned char *p_buf
,
990 unsigned char buf
[VPD_TMP_BUF_SIZE
];
993 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
995 switch (vpd
->device_identifier_code_set
) {
996 case 0x01: /* Binary */
997 snprintf(buf
, sizeof(buf
),
998 "T10 VPD Binary Device Identifier: %s\n",
999 &vpd
->device_identifier
[0]);
1001 case 0x02: /* ASCII */
1002 snprintf(buf
, sizeof(buf
),
1003 "T10 VPD ASCII Device Identifier: %s\n",
1004 &vpd
->device_identifier
[0]);
1006 case 0x03: /* UTF-8 */
1007 snprintf(buf
, sizeof(buf
),
1008 "T10 VPD UTF-8 Device Identifier: %s\n",
1009 &vpd
->device_identifier
[0]);
1012 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1013 " 0x%02x", vpd
->device_identifier_code_set
);
1019 strncpy(p_buf
, buf
, p_buf_len
);
1021 pr_debug("%s", buf
);
1027 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1029 static const char hex_str
[] = "0123456789abcdef";
1030 int j
= 0, i
= 4; /* offset to start of the identifier */
1033 * The VPD Code Set (encoding)
1035 * from spc3r23.pdf Section 7.6.3.1 Table 296
1037 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1038 switch (vpd
->device_identifier_code_set
) {
1039 case 0x01: /* Binary */
1040 vpd
->device_identifier
[j
++] =
1041 hex_str
[vpd
->device_identifier_type
];
1042 while (i
< (4 + page_83
[3])) {
1043 vpd
->device_identifier
[j
++] =
1044 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1045 vpd
->device_identifier
[j
++] =
1046 hex_str
[page_83
[i
] & 0x0f];
1050 case 0x02: /* ASCII */
1051 case 0x03: /* UTF-8 */
1052 while (i
< (4 + page_83
[3]))
1053 vpd
->device_identifier
[j
++] = page_83
[i
++];
1059 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1061 EXPORT_SYMBOL(transport_set_vpd_ident
);
1064 target_cmd_size_check(struct se_cmd
*cmd
, unsigned int size
)
1066 struct se_device
*dev
= cmd
->se_dev
;
1068 if (cmd
->unknown_data_length
) {
1069 cmd
->data_length
= size
;
1070 } else if (size
!= cmd
->data_length
) {
1071 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1072 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1073 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
1074 cmd
->data_length
, size
, cmd
->t_task_cdb
[0]);
1076 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
1077 pr_err("Rejecting underflow/overflow"
1079 return TCM_INVALID_CDB_FIELD
;
1082 * Reject READ_* or WRITE_* with overflow/underflow for
1083 * type SCF_SCSI_DATA_CDB.
1085 if (dev
->dev_attrib
.block_size
!= 512) {
1086 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1087 " CDB on non 512-byte sector setup subsystem"
1088 " plugin: %s\n", dev
->transport
->name
);
1089 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1090 return TCM_INVALID_CDB_FIELD
;
1093 * For the overflow case keep the existing fabric provided
1094 * ->data_length. Otherwise for the underflow case, reset
1095 * ->data_length to the smaller SCSI expected data transfer
1098 if (size
> cmd
->data_length
) {
1099 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
1100 cmd
->residual_count
= (size
- cmd
->data_length
);
1102 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
1103 cmd
->residual_count
= (cmd
->data_length
- size
);
1104 cmd
->data_length
= size
;
1113 * Used by fabric modules containing a local struct se_cmd within their
1114 * fabric dependent per I/O descriptor.
1116 void transport_init_se_cmd(
1118 struct target_core_fabric_ops
*tfo
,
1119 struct se_session
*se_sess
,
1123 unsigned char *sense_buffer
)
1125 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1126 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1127 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1128 INIT_LIST_HEAD(&cmd
->state_list
);
1129 init_completion(&cmd
->t_transport_stop_comp
);
1130 init_completion(&cmd
->cmd_wait_comp
);
1131 init_completion(&cmd
->task_stop_comp
);
1132 spin_lock_init(&cmd
->t_state_lock
);
1133 kref_init(&cmd
->cmd_kref
);
1134 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1137 cmd
->se_sess
= se_sess
;
1138 cmd
->data_length
= data_length
;
1139 cmd
->data_direction
= data_direction
;
1140 cmd
->sam_task_attr
= task_attr
;
1141 cmd
->sense_buffer
= sense_buffer
;
1143 cmd
->state_active
= false;
1145 EXPORT_SYMBOL(transport_init_se_cmd
);
1147 static sense_reason_t
1148 transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1150 struct se_device
*dev
= cmd
->se_dev
;
1153 * Check if SAM Task Attribute emulation is enabled for this
1154 * struct se_device storage object
1156 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1159 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1160 pr_debug("SAM Task Attribute ACA"
1161 " emulation is not supported\n");
1162 return TCM_INVALID_CDB_FIELD
;
1165 * Used to determine when ORDERED commands should go from
1166 * Dormant to Active status.
1168 cmd
->se_ordered_id
= atomic_inc_return(&dev
->dev_ordered_id
);
1169 smp_mb__after_atomic();
1170 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1171 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1172 dev
->transport
->name
);
1177 target_setup_cmd_from_cdb(struct se_cmd
*cmd
, unsigned char *cdb
)
1179 struct se_device
*dev
= cmd
->se_dev
;
1183 * Ensure that the received CDB is less than the max (252 + 8) bytes
1184 * for VARIABLE_LENGTH_CMD
1186 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1187 pr_err("Received SCSI CDB with command_size: %d that"
1188 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1189 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1190 return TCM_INVALID_CDB_FIELD
;
1193 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1194 * allocate the additional extended CDB buffer now.. Otherwise
1195 * setup the pointer from __t_task_cdb to t_task_cdb.
1197 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1198 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1200 if (!cmd
->t_task_cdb
) {
1201 pr_err("Unable to allocate cmd->t_task_cdb"
1202 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1203 scsi_command_size(cdb
),
1204 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1205 return TCM_OUT_OF_RESOURCES
;
1208 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1210 * Copy the original CDB into cmd->
1212 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1214 trace_target_sequencer_start(cmd
);
1217 * Check for an existing UNIT ATTENTION condition
1219 ret
= target_scsi3_ua_check(cmd
);
1223 ret
= target_alua_state_check(cmd
);
1227 ret
= target_check_reservation(cmd
);
1229 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1233 ret
= dev
->transport
->parse_cdb(cmd
);
1237 ret
= transport_check_alloc_task_attr(cmd
);
1241 cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1243 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1244 if (cmd
->se_lun
->lun_sep
)
1245 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1246 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1249 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1252 * Used by fabric module frontends to queue tasks directly.
1253 * Many only be used from process context only
1255 int transport_handle_cdb_direct(
1262 pr_err("cmd->se_lun is NULL\n");
1265 if (in_interrupt()) {
1267 pr_err("transport_generic_handle_cdb cannot be called"
1268 " from interrupt context\n");
1272 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1273 * outstanding descriptors are handled correctly during shutdown via
1274 * transport_wait_for_tasks()
1276 * Also, we don't take cmd->t_state_lock here as we only expect
1277 * this to be called for initial descriptor submission.
1279 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1280 cmd
->transport_state
|= CMD_T_ACTIVE
;
1283 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1284 * so follow TRANSPORT_NEW_CMD processing thread context usage
1285 * and call transport_generic_request_failure() if necessary..
1287 ret
= transport_generic_new_cmd(cmd
);
1289 transport_generic_request_failure(cmd
, ret
);
1292 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1295 transport_generic_map_mem_to_cmd(struct se_cmd
*cmd
, struct scatterlist
*sgl
,
1296 u32 sgl_count
, struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
)
1298 if (!sgl
|| !sgl_count
)
1302 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1303 * scatterlists already have been set to follow what the fabric
1304 * passes for the original expected data transfer length.
1306 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
1307 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1308 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1309 return TCM_INVALID_CDB_FIELD
;
1312 cmd
->t_data_sg
= sgl
;
1313 cmd
->t_data_nents
= sgl_count
;
1315 if (sgl_bidi
&& sgl_bidi_count
) {
1316 cmd
->t_bidi_data_sg
= sgl_bidi
;
1317 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
1319 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
1324 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1325 * se_cmd + use pre-allocated SGL memory.
1327 * @se_cmd: command descriptor to submit
1328 * @se_sess: associated se_sess for endpoint
1329 * @cdb: pointer to SCSI CDB
1330 * @sense: pointer to SCSI sense buffer
1331 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1332 * @data_length: fabric expected data transfer length
1333 * @task_addr: SAM task attribute
1334 * @data_dir: DMA data direction
1335 * @flags: flags for command submission from target_sc_flags_tables
1336 * @sgl: struct scatterlist memory for unidirectional mapping
1337 * @sgl_count: scatterlist count for unidirectional mapping
1338 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1339 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1340 * @sgl_prot: struct scatterlist memory protection information
1341 * @sgl_prot_count: scatterlist count for protection information
1343 * Returns non zero to signal active I/O shutdown failure. All other
1344 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1345 * but still return zero here.
1347 * This may only be called from process context, and also currently
1348 * assumes internal allocation of fabric payload buffer by target-core.
1350 int target_submit_cmd_map_sgls(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1351 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1352 u32 data_length
, int task_attr
, int data_dir
, int flags
,
1353 struct scatterlist
*sgl
, u32 sgl_count
,
1354 struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
,
1355 struct scatterlist
*sgl_prot
, u32 sgl_prot_count
)
1357 struct se_portal_group
*se_tpg
;
1361 se_tpg
= se_sess
->se_tpg
;
1363 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1364 BUG_ON(in_interrupt());
1366 * Initialize se_cmd for target operation. From this point
1367 * exceptions are handled by sending exception status via
1368 * target_core_fabric_ops->queue_status() callback
1370 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1371 data_length
, data_dir
, task_attr
, sense
);
1372 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1373 se_cmd
->unknown_data_length
= 1;
1375 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1376 * se_sess->sess_cmd_list. A second kref_get here is necessary
1377 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1378 * kref_put() to happen during fabric packet acknowledgement.
1380 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1384 * Signal bidirectional data payloads to target-core
1386 if (flags
& TARGET_SCF_BIDI_OP
)
1387 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1389 * Locate se_lun pointer and attach it to struct se_cmd
1391 rc
= transport_lookup_cmd_lun(se_cmd
, unpacked_lun
);
1393 transport_send_check_condition_and_sense(se_cmd
, rc
, 0);
1394 target_put_sess_cmd(se_sess
, se_cmd
);
1398 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1400 transport_generic_request_failure(se_cmd
, rc
);
1405 * Save pointers for SGLs containing protection information,
1408 if (sgl_prot_count
) {
1409 se_cmd
->t_prot_sg
= sgl_prot
;
1410 se_cmd
->t_prot_nents
= sgl_prot_count
;
1414 * When a non zero sgl_count has been passed perform SGL passthrough
1415 * mapping for pre-allocated fabric memory instead of having target
1416 * core perform an internal SGL allocation..
1418 if (sgl_count
!= 0) {
1422 * A work-around for tcm_loop as some userspace code via
1423 * scsi-generic do not memset their associated read buffers,
1424 * so go ahead and do that here for type non-data CDBs. Also
1425 * note that this is currently guaranteed to be a single SGL
1426 * for this case by target core in target_setup_cmd_from_cdb()
1427 * -> transport_generic_cmd_sequencer().
1429 if (!(se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) &&
1430 se_cmd
->data_direction
== DMA_FROM_DEVICE
) {
1431 unsigned char *buf
= NULL
;
1434 buf
= kmap(sg_page(sgl
)) + sgl
->offset
;
1437 memset(buf
, 0, sgl
->length
);
1438 kunmap(sg_page(sgl
));
1442 rc
= transport_generic_map_mem_to_cmd(se_cmd
, sgl
, sgl_count
,
1443 sgl_bidi
, sgl_bidi_count
);
1445 transport_generic_request_failure(se_cmd
, rc
);
1451 * Check if we need to delay processing because of ALUA
1452 * Active/NonOptimized primary access state..
1454 core_alua_check_nonop_delay(se_cmd
);
1456 transport_handle_cdb_direct(se_cmd
);
1459 EXPORT_SYMBOL(target_submit_cmd_map_sgls
);
1462 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1464 * @se_cmd: command descriptor to submit
1465 * @se_sess: associated se_sess for endpoint
1466 * @cdb: pointer to SCSI CDB
1467 * @sense: pointer to SCSI sense buffer
1468 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1469 * @data_length: fabric expected data transfer length
1470 * @task_addr: SAM task attribute
1471 * @data_dir: DMA data direction
1472 * @flags: flags for command submission from target_sc_flags_tables
1474 * Returns non zero to signal active I/O shutdown failure. All other
1475 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1476 * but still return zero here.
1478 * This may only be called from process context, and also currently
1479 * assumes internal allocation of fabric payload buffer by target-core.
1481 * It also assumes interal target core SGL memory allocation.
1483 int target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1484 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1485 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1487 return target_submit_cmd_map_sgls(se_cmd
, se_sess
, cdb
, sense
,
1488 unpacked_lun
, data_length
, task_attr
, data_dir
,
1489 flags
, NULL
, 0, NULL
, 0, NULL
, 0);
1491 EXPORT_SYMBOL(target_submit_cmd
);
1493 static void target_complete_tmr_failure(struct work_struct
*work
)
1495 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1497 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1498 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1500 transport_cmd_check_stop_to_fabric(se_cmd
);
1504 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1507 * @se_cmd: command descriptor to submit
1508 * @se_sess: associated se_sess for endpoint
1509 * @sense: pointer to SCSI sense buffer
1510 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1511 * @fabric_context: fabric context for TMR req
1512 * @tm_type: Type of TM request
1513 * @gfp: gfp type for caller
1514 * @tag: referenced task tag for TMR_ABORT_TASK
1515 * @flags: submit cmd flags
1517 * Callable from all contexts.
1520 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1521 unsigned char *sense
, u32 unpacked_lun
,
1522 void *fabric_tmr_ptr
, unsigned char tm_type
,
1523 gfp_t gfp
, unsigned int tag
, int flags
)
1525 struct se_portal_group
*se_tpg
;
1528 se_tpg
= se_sess
->se_tpg
;
1531 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1532 0, DMA_NONE
, MSG_SIMPLE_TAG
, sense
);
1534 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1535 * allocation failure.
1537 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1541 if (tm_type
== TMR_ABORT_TASK
)
1542 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1544 /* See target_submit_cmd for commentary */
1545 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1547 core_tmr_release_req(se_cmd
->se_tmr_req
);
1551 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1554 * For callback during failure handling, push this work off
1555 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1557 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1558 schedule_work(&se_cmd
->work
);
1561 transport_generic_handle_tmr(se_cmd
);
1564 EXPORT_SYMBOL(target_submit_tmr
);
1567 * If the cmd is active, request it to be stopped and sleep until it
1570 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1572 bool was_active
= false;
1574 if (cmd
->transport_state
& CMD_T_BUSY
) {
1575 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1576 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1578 pr_debug("cmd %p waiting to complete\n", cmd
);
1579 wait_for_completion(&cmd
->task_stop_comp
);
1580 pr_debug("cmd %p stopped successfully\n", cmd
);
1582 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1583 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1584 cmd
->transport_state
&= ~CMD_T_BUSY
;
1592 * Handle SAM-esque emulation for generic transport request failures.
1594 void transport_generic_request_failure(struct se_cmd
*cmd
,
1595 sense_reason_t sense_reason
)
1599 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1600 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1601 cmd
->t_task_cdb
[0]);
1602 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1603 cmd
->se_tfo
->get_cmd_state(cmd
),
1604 cmd
->t_state
, sense_reason
);
1605 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1606 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1607 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1608 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1611 * For SAM Task Attribute emulation for failed struct se_cmd
1613 transport_complete_task_attr(cmd
);
1615 * Handle special case for COMPARE_AND_WRITE failure, where the
1616 * callback is expected to drop the per device ->caw_mutex.
1618 if ((cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
) &&
1619 cmd
->transport_complete_callback
)
1620 cmd
->transport_complete_callback(cmd
);
1622 switch (sense_reason
) {
1623 case TCM_NON_EXISTENT_LUN
:
1624 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1625 case TCM_INVALID_CDB_FIELD
:
1626 case TCM_INVALID_PARAMETER_LIST
:
1627 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
1628 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1629 case TCM_UNKNOWN_MODE_PAGE
:
1630 case TCM_WRITE_PROTECTED
:
1631 case TCM_ADDRESS_OUT_OF_RANGE
:
1632 case TCM_CHECK_CONDITION_ABORT_CMD
:
1633 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1634 case TCM_CHECK_CONDITION_NOT_READY
:
1635 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED
:
1636 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED
:
1637 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED
:
1639 case TCM_OUT_OF_RESOURCES
:
1640 sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1642 case TCM_RESERVATION_CONFLICT
:
1644 * No SENSE Data payload for this case, set SCSI Status
1645 * and queue the response to $FABRIC_MOD.
1647 * Uses linux/include/scsi/scsi.h SAM status codes defs
1649 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1651 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1652 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1655 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1658 cmd
->se_dev
->dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1659 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1660 cmd
->orig_fe_lun
, 0x2C,
1661 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1663 trace_target_cmd_complete(cmd
);
1664 ret
= cmd
->se_tfo
-> queue_status(cmd
);
1665 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1669 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1670 cmd
->t_task_cdb
[0], sense_reason
);
1671 sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1675 ret
= transport_send_check_condition_and_sense(cmd
, sense_reason
, 0);
1676 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1680 transport_lun_remove_cmd(cmd
);
1681 if (!transport_cmd_check_stop_to_fabric(cmd
))
1686 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1687 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1689 EXPORT_SYMBOL(transport_generic_request_failure
);
1691 void __target_execute_cmd(struct se_cmd
*cmd
)
1695 if (cmd
->execute_cmd
) {
1696 ret
= cmd
->execute_cmd(cmd
);
1698 spin_lock_irq(&cmd
->t_state_lock
);
1699 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1700 spin_unlock_irq(&cmd
->t_state_lock
);
1702 transport_generic_request_failure(cmd
, ret
);
1707 static bool target_handle_task_attr(struct se_cmd
*cmd
)
1709 struct se_device
*dev
= cmd
->se_dev
;
1711 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1715 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1716 * to allow the passed struct se_cmd list of tasks to the front of the list.
1718 switch (cmd
->sam_task_attr
) {
1720 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1721 "se_ordered_id: %u\n",
1722 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1724 case MSG_ORDERED_TAG
:
1725 atomic_inc(&dev
->dev_ordered_sync
);
1726 smp_mb__after_atomic();
1728 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1729 " se_ordered_id: %u\n",
1730 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1733 * Execute an ORDERED command if no other older commands
1734 * exist that need to be completed first.
1736 if (!atomic_read(&dev
->simple_cmds
))
1741 * For SIMPLE and UNTAGGED Task Attribute commands
1743 atomic_inc(&dev
->simple_cmds
);
1744 smp_mb__after_atomic();
1748 if (atomic_read(&dev
->dev_ordered_sync
) == 0)
1751 spin_lock(&dev
->delayed_cmd_lock
);
1752 list_add_tail(&cmd
->se_delayed_node
, &dev
->delayed_cmd_list
);
1753 spin_unlock(&dev
->delayed_cmd_lock
);
1755 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1756 " delayed CMD list, se_ordered_id: %u\n",
1757 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1758 cmd
->se_ordered_id
);
1762 void target_execute_cmd(struct se_cmd
*cmd
)
1765 * If the received CDB has aleady been aborted stop processing it here.
1767 if (transport_check_aborted_status(cmd
, 1))
1771 * Determine if frontend context caller is requesting the stopping of
1772 * this command for frontend exceptions.
1774 spin_lock_irq(&cmd
->t_state_lock
);
1775 if (cmd
->transport_state
& CMD_T_STOP
) {
1776 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1778 cmd
->se_tfo
->get_task_tag(cmd
));
1780 spin_unlock_irq(&cmd
->t_state_lock
);
1781 complete_all(&cmd
->t_transport_stop_comp
);
1785 cmd
->t_state
= TRANSPORT_PROCESSING
;
1786 cmd
->transport_state
|= CMD_T_ACTIVE
|CMD_T_BUSY
|CMD_T_SENT
;
1787 spin_unlock_irq(&cmd
->t_state_lock
);
1789 * Perform WRITE_INSERT of PI using software emulation when backend
1790 * device has PI enabled, if the transport has not already generated
1791 * PI using hardware WRITE_INSERT offload.
1793 if (cmd
->prot_op
== TARGET_PROT_DOUT_INSERT
) {
1794 if (!(cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DOUT_INSERT
))
1795 sbc_dif_generate(cmd
);
1798 if (target_handle_task_attr(cmd
)) {
1799 spin_lock_irq(&cmd
->t_state_lock
);
1800 cmd
->transport_state
&= ~CMD_T_BUSY
|CMD_T_SENT
;
1801 spin_unlock_irq(&cmd
->t_state_lock
);
1805 __target_execute_cmd(cmd
);
1807 EXPORT_SYMBOL(target_execute_cmd
);
1810 * Process all commands up to the last received ORDERED task attribute which
1811 * requires another blocking boundary
1813 static void target_restart_delayed_cmds(struct se_device
*dev
)
1818 spin_lock(&dev
->delayed_cmd_lock
);
1819 if (list_empty(&dev
->delayed_cmd_list
)) {
1820 spin_unlock(&dev
->delayed_cmd_lock
);
1824 cmd
= list_entry(dev
->delayed_cmd_list
.next
,
1825 struct se_cmd
, se_delayed_node
);
1826 list_del(&cmd
->se_delayed_node
);
1827 spin_unlock(&dev
->delayed_cmd_lock
);
1829 __target_execute_cmd(cmd
);
1831 if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
)
1837 * Called from I/O completion to determine which dormant/delayed
1838 * and ordered cmds need to have their tasks added to the execution queue.
1840 static void transport_complete_task_attr(struct se_cmd
*cmd
)
1842 struct se_device
*dev
= cmd
->se_dev
;
1844 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1847 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
1848 atomic_dec(&dev
->simple_cmds
);
1849 smp_mb__after_atomic();
1850 dev
->dev_cur_ordered_id
++;
1851 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1852 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
1853 cmd
->se_ordered_id
);
1854 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1855 dev
->dev_cur_ordered_id
++;
1856 pr_debug("Incremented dev_cur_ordered_id: %u for"
1857 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
1858 cmd
->se_ordered_id
);
1859 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1860 atomic_dec(&dev
->dev_ordered_sync
);
1861 smp_mb__after_atomic();
1863 dev
->dev_cur_ordered_id
++;
1864 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1865 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
1868 target_restart_delayed_cmds(dev
);
1871 static void transport_complete_qf(struct se_cmd
*cmd
)
1875 transport_complete_task_attr(cmd
);
1877 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1878 trace_target_cmd_complete(cmd
);
1879 ret
= cmd
->se_tfo
->queue_status(cmd
);
1884 switch (cmd
->data_direction
) {
1885 case DMA_FROM_DEVICE
:
1886 trace_target_cmd_complete(cmd
);
1887 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1890 if (cmd
->se_cmd_flags
& SCF_BIDI
) {
1891 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1895 /* Fall through for DMA_TO_DEVICE */
1897 trace_target_cmd_complete(cmd
);
1898 ret
= cmd
->se_tfo
->queue_status(cmd
);
1906 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1909 transport_lun_remove_cmd(cmd
);
1910 transport_cmd_check_stop_to_fabric(cmd
);
1913 static void transport_handle_queue_full(
1915 struct se_device
*dev
)
1917 spin_lock_irq(&dev
->qf_cmd_lock
);
1918 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
1919 atomic_inc(&dev
->dev_qf_count
);
1920 smp_mb__after_atomic();
1921 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
1923 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1926 static bool target_check_read_strip(struct se_cmd
*cmd
)
1930 if (!(cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DIN_STRIP
)) {
1931 rc
= sbc_dif_read_strip(cmd
);
1941 static void target_complete_ok_work(struct work_struct
*work
)
1943 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
1947 * Check if we need to move delayed/dormant tasks from cmds on the
1948 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1951 transport_complete_task_attr(cmd
);
1954 * Check to schedule QUEUE_FULL work, or execute an existing
1955 * cmd->transport_qf_callback()
1957 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
1958 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1961 * Check if we need to send a sense buffer from
1962 * the struct se_cmd in question.
1964 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1965 WARN_ON(!cmd
->scsi_status
);
1966 ret
= transport_send_check_condition_and_sense(
1968 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1971 transport_lun_remove_cmd(cmd
);
1972 transport_cmd_check_stop_to_fabric(cmd
);
1976 * Check for a callback, used by amongst other things
1977 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
1979 if (cmd
->transport_complete_callback
) {
1982 rc
= cmd
->transport_complete_callback(cmd
);
1983 if (!rc
&& !(cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE_POST
)) {
1986 ret
= transport_send_check_condition_and_sense(cmd
,
1988 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1991 transport_lun_remove_cmd(cmd
);
1992 transport_cmd_check_stop_to_fabric(cmd
);
1997 switch (cmd
->data_direction
) {
1998 case DMA_FROM_DEVICE
:
1999 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2000 if (cmd
->se_lun
->lun_sep
) {
2001 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
2004 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2006 * Perform READ_STRIP of PI using software emulation when
2007 * backend had PI enabled, if the transport will not be
2008 * performing hardware READ_STRIP offload.
2010 if (cmd
->prot_op
== TARGET_PROT_DIN_STRIP
&&
2011 target_check_read_strip(cmd
)) {
2012 ret
= transport_send_check_condition_and_sense(cmd
,
2014 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2017 transport_lun_remove_cmd(cmd
);
2018 transport_cmd_check_stop_to_fabric(cmd
);
2022 trace_target_cmd_complete(cmd
);
2023 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2024 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2028 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2029 if (cmd
->se_lun
->lun_sep
) {
2030 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
2033 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2035 * Check if we need to send READ payload for BIDI-COMMAND
2037 if (cmd
->se_cmd_flags
& SCF_BIDI
) {
2038 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2039 if (cmd
->se_lun
->lun_sep
) {
2040 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
2043 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2044 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2045 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2049 /* Fall through for DMA_TO_DEVICE */
2051 trace_target_cmd_complete(cmd
);
2052 ret
= cmd
->se_tfo
->queue_status(cmd
);
2053 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2060 transport_lun_remove_cmd(cmd
);
2061 transport_cmd_check_stop_to_fabric(cmd
);
2065 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2066 " data_direction: %d\n", cmd
, cmd
->data_direction
);
2067 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
2068 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2071 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
2073 struct scatterlist
*sg
;
2076 for_each_sg(sgl
, sg
, nents
, count
)
2077 __free_page(sg_page(sg
));
2082 static inline void transport_reset_sgl_orig(struct se_cmd
*cmd
)
2085 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2086 * emulation, and free + reset pointers if necessary..
2088 if (!cmd
->t_data_sg_orig
)
2091 kfree(cmd
->t_data_sg
);
2092 cmd
->t_data_sg
= cmd
->t_data_sg_orig
;
2093 cmd
->t_data_sg_orig
= NULL
;
2094 cmd
->t_data_nents
= cmd
->t_data_nents_orig
;
2095 cmd
->t_data_nents_orig
= 0;
2098 static inline void transport_free_pages(struct se_cmd
*cmd
)
2100 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) {
2101 transport_reset_sgl_orig(cmd
);
2104 transport_reset_sgl_orig(cmd
);
2106 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
2107 cmd
->t_data_sg
= NULL
;
2108 cmd
->t_data_nents
= 0;
2110 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
2111 cmd
->t_bidi_data_sg
= NULL
;
2112 cmd
->t_bidi_data_nents
= 0;
2114 transport_free_sgl(cmd
->t_prot_sg
, cmd
->t_prot_nents
);
2115 cmd
->t_prot_sg
= NULL
;
2116 cmd
->t_prot_nents
= 0;
2120 * transport_release_cmd - free a command
2121 * @cmd: command to free
2123 * This routine unconditionally frees a command, and reference counting
2124 * or list removal must be done in the caller.
2126 static int transport_release_cmd(struct se_cmd
*cmd
)
2128 BUG_ON(!cmd
->se_tfo
);
2130 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
2131 core_tmr_release_req(cmd
->se_tmr_req
);
2132 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
2133 kfree(cmd
->t_task_cdb
);
2135 * If this cmd has been setup with target_get_sess_cmd(), drop
2136 * the kref and call ->release_cmd() in kref callback.
2138 return target_put_sess_cmd(cmd
->se_sess
, cmd
);
2142 * transport_put_cmd - release a reference to a command
2143 * @cmd: command to release
2145 * This routine releases our reference to the command and frees it if possible.
2147 static int transport_put_cmd(struct se_cmd
*cmd
)
2149 transport_free_pages(cmd
);
2150 return transport_release_cmd(cmd
);
2153 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
2155 struct scatterlist
*sg
= cmd
->t_data_sg
;
2156 struct page
**pages
;
2160 * We need to take into account a possible offset here for fabrics like
2161 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2162 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2164 if (!cmd
->t_data_nents
)
2168 if (cmd
->t_data_nents
== 1)
2169 return kmap(sg_page(sg
)) + sg
->offset
;
2171 /* >1 page. use vmap */
2172 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
2176 /* convert sg[] to pages[] */
2177 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
2178 pages
[i
] = sg_page(sg
);
2181 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
2183 if (!cmd
->t_data_vmap
)
2186 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
2188 EXPORT_SYMBOL(transport_kmap_data_sg
);
2190 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
2192 if (!cmd
->t_data_nents
) {
2194 } else if (cmd
->t_data_nents
== 1) {
2195 kunmap(sg_page(cmd
->t_data_sg
));
2199 vunmap(cmd
->t_data_vmap
);
2200 cmd
->t_data_vmap
= NULL
;
2202 EXPORT_SYMBOL(transport_kunmap_data_sg
);
2205 target_alloc_sgl(struct scatterlist
**sgl
, unsigned int *nents
, u32 length
,
2208 struct scatterlist
*sg
;
2210 gfp_t zero_flag
= (zero_page
) ? __GFP_ZERO
: 0;
2214 nent
= DIV_ROUND_UP(length
, PAGE_SIZE
);
2215 sg
= kmalloc(sizeof(struct scatterlist
) * nent
, GFP_KERNEL
);
2219 sg_init_table(sg
, nent
);
2222 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
2223 page
= alloc_page(GFP_KERNEL
| zero_flag
);
2227 sg_set_page(&sg
[i
], page
, page_len
, 0);
2238 __free_page(sg_page(&sg
[i
]));
2245 * Allocate any required resources to execute the command. For writes we
2246 * might not have the payload yet, so notify the fabric via a call to
2247 * ->write_pending instead. Otherwise place it on the execution queue.
2250 transport_generic_new_cmd(struct se_cmd
*cmd
)
2255 * Determine is the TCM fabric module has already allocated physical
2256 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2259 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
2261 bool zero_flag
= !(cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
);
2263 if ((cmd
->se_cmd_flags
& SCF_BIDI
) ||
2264 (cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
)) {
2267 if (cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
)
2268 bidi_length
= cmd
->t_task_nolb
*
2269 cmd
->se_dev
->dev_attrib
.block_size
;
2271 bidi_length
= cmd
->data_length
;
2273 ret
= target_alloc_sgl(&cmd
->t_bidi_data_sg
,
2274 &cmd
->t_bidi_data_nents
,
2275 bidi_length
, zero_flag
);
2277 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2280 if (cmd
->prot_op
!= TARGET_PROT_NORMAL
) {
2281 ret
= target_alloc_sgl(&cmd
->t_prot_sg
,
2283 cmd
->prot_length
, true);
2285 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2288 ret
= target_alloc_sgl(&cmd
->t_data_sg
, &cmd
->t_data_nents
,
2289 cmd
->data_length
, zero_flag
);
2291 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2294 * If this command is not a write we can execute it right here,
2295 * for write buffers we need to notify the fabric driver first
2296 * and let it call back once the write buffers are ready.
2298 target_add_to_state_list(cmd
);
2299 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
2300 target_execute_cmd(cmd
);
2303 transport_cmd_check_stop(cmd
, false, true);
2305 ret
= cmd
->se_tfo
->write_pending(cmd
);
2306 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2309 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2312 return (!ret
) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2315 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
2316 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
2317 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2320 EXPORT_SYMBOL(transport_generic_new_cmd
);
2322 static void transport_write_pending_qf(struct se_cmd
*cmd
)
2326 ret
= cmd
->se_tfo
->write_pending(cmd
);
2327 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
2328 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2330 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2334 int transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
2336 unsigned long flags
;
2339 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
2340 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
2341 transport_wait_for_tasks(cmd
);
2343 ret
= transport_release_cmd(cmd
);
2346 transport_wait_for_tasks(cmd
);
2348 * Handle WRITE failure case where transport_generic_new_cmd()
2349 * has already added se_cmd to state_list, but fabric has
2350 * failed command before I/O submission.
2352 if (cmd
->state_active
) {
2353 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2354 target_remove_from_state_list(cmd
);
2355 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2359 transport_lun_remove_cmd(cmd
);
2361 ret
= transport_put_cmd(cmd
);
2365 EXPORT_SYMBOL(transport_generic_free_cmd
);
2367 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2368 * @se_sess: session to reference
2369 * @se_cmd: command descriptor to add
2370 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2372 int target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
2375 unsigned long flags
;
2379 * Add a second kref if the fabric caller is expecting to handle
2380 * fabric acknowledgement that requires two target_put_sess_cmd()
2381 * invocations before se_cmd descriptor release.
2384 kref_get(&se_cmd
->cmd_kref
);
2385 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
2388 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2389 if (se_sess
->sess_tearing_down
) {
2393 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
2395 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2398 EXPORT_SYMBOL(target_get_sess_cmd
);
2400 static void target_release_cmd_kref(struct kref
*kref
)
2402 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
2403 struct se_session
*se_sess
= se_cmd
->se_sess
;
2405 if (list_empty(&se_cmd
->se_cmd_list
)) {
2406 spin_unlock(&se_sess
->sess_cmd_lock
);
2407 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2410 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
2411 spin_unlock(&se_sess
->sess_cmd_lock
);
2412 complete(&se_cmd
->cmd_wait_comp
);
2415 list_del(&se_cmd
->se_cmd_list
);
2416 spin_unlock(&se_sess
->sess_cmd_lock
);
2418 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2421 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2422 * @se_sess: session to reference
2423 * @se_cmd: command descriptor to drop
2425 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
2428 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2431 return kref_put_spinlock_irqsave(&se_cmd
->cmd_kref
, target_release_cmd_kref
,
2432 &se_sess
->sess_cmd_lock
);
2434 EXPORT_SYMBOL(target_put_sess_cmd
);
2436 /* target_sess_cmd_list_set_waiting - Flag all commands in
2437 * sess_cmd_list to complete cmd_wait_comp. Set
2438 * sess_tearing_down so no more commands are queued.
2439 * @se_sess: session to flag
2441 void target_sess_cmd_list_set_waiting(struct se_session
*se_sess
)
2443 struct se_cmd
*se_cmd
;
2444 unsigned long flags
;
2446 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2447 if (se_sess
->sess_tearing_down
) {
2448 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2451 se_sess
->sess_tearing_down
= 1;
2452 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
2454 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
2455 se_cmd
->cmd_wait_set
= 1;
2457 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2459 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting
);
2461 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2462 * @se_sess: session to wait for active I/O
2464 void target_wait_for_sess_cmds(struct se_session
*se_sess
)
2466 struct se_cmd
*se_cmd
, *tmp_cmd
;
2467 unsigned long flags
;
2469 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
2470 &se_sess
->sess_wait_list
, se_cmd_list
) {
2471 list_del(&se_cmd
->se_cmd_list
);
2473 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2474 " %d\n", se_cmd
, se_cmd
->t_state
,
2475 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2477 wait_for_completion(&se_cmd
->cmd_wait_comp
);
2478 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2479 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2480 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2482 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2485 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2486 WARN_ON(!list_empty(&se_sess
->sess_cmd_list
));
2487 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2490 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
2492 static int transport_clear_lun_ref_thread(void *p
)
2494 struct se_lun
*lun
= p
;
2496 percpu_ref_kill(&lun
->lun_ref
);
2498 wait_for_completion(&lun
->lun_ref_comp
);
2499 complete(&lun
->lun_shutdown_comp
);
2504 int transport_clear_lun_ref(struct se_lun
*lun
)
2506 struct task_struct
*kt
;
2508 kt
= kthread_run(transport_clear_lun_ref_thread
, lun
,
2509 "tcm_cl_%u", lun
->unpacked_lun
);
2511 pr_err("Unable to start clear_lun thread\n");
2514 wait_for_completion(&lun
->lun_shutdown_comp
);
2520 * transport_wait_for_tasks - wait for completion to occur
2521 * @cmd: command to wait
2523 * Called from frontend fabric context to wait for storage engine
2524 * to pause and/or release frontend generated struct se_cmd.
2526 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
2528 unsigned long flags
;
2530 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2531 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
2532 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2533 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2537 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
2538 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2539 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2543 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
2544 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2548 cmd
->transport_state
|= CMD_T_STOP
;
2550 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2551 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2552 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
2553 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2555 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2557 wait_for_completion(&cmd
->t_transport_stop_comp
);
2559 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2560 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
2562 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2563 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2564 cmd
->se_tfo
->get_task_tag(cmd
));
2566 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2570 EXPORT_SYMBOL(transport_wait_for_tasks
);
2572 static int transport_get_sense_codes(
2577 *asc
= cmd
->scsi_asc
;
2578 *ascq
= cmd
->scsi_ascq
;
2584 void transport_err_sector_info(unsigned char *buffer
, sector_t bad_sector
)
2586 /* Place failed LBA in sense data information descriptor 0. */
2587 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 0xc;
2588 buffer
[SPC_DESC_TYPE_OFFSET
] = 0; /* Information */
2589 buffer
[SPC_ADDITIONAL_DESC_LEN_OFFSET
] = 0xa;
2590 buffer
[SPC_VALIDITY_OFFSET
] = 0x80;
2592 /* Descriptor Information: failing sector */
2593 put_unaligned_be64(bad_sector
, &buffer
[12]);
2597 transport_send_check_condition_and_sense(struct se_cmd
*cmd
,
2598 sense_reason_t reason
, int from_transport
)
2600 unsigned char *buffer
= cmd
->sense_buffer
;
2601 unsigned long flags
;
2602 u8 asc
= 0, ascq
= 0;
2604 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2605 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2606 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2609 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
2610 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2612 if (!reason
&& from_transport
)
2615 if (!from_transport
)
2616 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
2619 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2620 * SENSE KEY values from include/scsi/scsi.h
2626 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2628 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2629 /* NO ADDITIONAL SENSE INFORMATION */
2630 buffer
[SPC_ASC_KEY_OFFSET
] = 0;
2631 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0;
2633 case TCM_NON_EXISTENT_LUN
:
2636 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2637 /* ILLEGAL REQUEST */
2638 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2639 /* LOGICAL UNIT NOT SUPPORTED */
2640 buffer
[SPC_ASC_KEY_OFFSET
] = 0x25;
2642 case TCM_UNSUPPORTED_SCSI_OPCODE
:
2643 case TCM_SECTOR_COUNT_TOO_MANY
:
2646 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2647 /* ILLEGAL REQUEST */
2648 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2649 /* INVALID COMMAND OPERATION CODE */
2650 buffer
[SPC_ASC_KEY_OFFSET
] = 0x20;
2652 case TCM_UNKNOWN_MODE_PAGE
:
2655 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2656 /* ILLEGAL REQUEST */
2657 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2658 /* INVALID FIELD IN CDB */
2659 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2661 case TCM_CHECK_CONDITION_ABORT_CMD
:
2664 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2665 /* ABORTED COMMAND */
2666 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2667 /* BUS DEVICE RESET FUNCTION OCCURRED */
2668 buffer
[SPC_ASC_KEY_OFFSET
] = 0x29;
2669 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2671 case TCM_INCORRECT_AMOUNT_OF_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 /* NOT ENOUGH UNSOLICITED DATA */
2680 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0d;
2682 case TCM_INVALID_CDB_FIELD
:
2685 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2686 /* ILLEGAL REQUEST */
2687 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2688 /* INVALID FIELD IN CDB */
2689 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2691 case TCM_INVALID_PARAMETER_LIST
:
2694 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2695 /* ILLEGAL REQUEST */
2696 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2697 /* INVALID FIELD IN PARAMETER LIST */
2698 buffer
[SPC_ASC_KEY_OFFSET
] = 0x26;
2700 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
2703 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2704 /* ILLEGAL REQUEST */
2705 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2706 /* PARAMETER LIST LENGTH ERROR */
2707 buffer
[SPC_ASC_KEY_OFFSET
] = 0x1a;
2709 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
2712 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2713 /* ABORTED COMMAND */
2714 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2716 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2717 /* UNEXPECTED_UNSOLICITED_DATA */
2718 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0c;
2720 case TCM_SERVICE_CRC_ERROR
:
2723 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2724 /* ABORTED COMMAND */
2725 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2726 /* PROTOCOL SERVICE CRC ERROR */
2727 buffer
[SPC_ASC_KEY_OFFSET
] = 0x47;
2729 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x05;
2731 case TCM_SNACK_REJECTED
:
2734 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2735 /* ABORTED COMMAND */
2736 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2738 buffer
[SPC_ASC_KEY_OFFSET
] = 0x11;
2739 /* FAILED RETRANSMISSION REQUEST */
2740 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x13;
2742 case TCM_WRITE_PROTECTED
:
2745 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2747 buffer
[SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
2748 /* WRITE PROTECTED */
2749 buffer
[SPC_ASC_KEY_OFFSET
] = 0x27;
2751 case TCM_ADDRESS_OUT_OF_RANGE
:
2754 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2755 /* ILLEGAL REQUEST */
2756 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2757 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2758 buffer
[SPC_ASC_KEY_OFFSET
] = 0x21;
2760 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
2763 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2764 /* UNIT ATTENTION */
2765 buffer
[SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
2766 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
2767 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2768 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2770 case TCM_CHECK_CONDITION_NOT_READY
:
2773 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2775 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2776 transport_get_sense_codes(cmd
, &asc
, &ascq
);
2777 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2778 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2780 case TCM_MISCOMPARE_VERIFY
:
2783 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2784 buffer
[SPC_SENSE_KEY_OFFSET
] = MISCOMPARE
;
2785 /* MISCOMPARE DURING VERIFY OPERATION */
2786 buffer
[SPC_ASC_KEY_OFFSET
] = 0x1d;
2787 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x00;
2789 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED
:
2792 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2793 /* ILLEGAL REQUEST */
2794 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2795 /* LOGICAL BLOCK GUARD CHECK FAILED */
2796 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2797 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x01;
2798 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2800 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED
:
2803 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2804 /* ILLEGAL REQUEST */
2805 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2806 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2807 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2808 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x02;
2809 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2811 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED
:
2814 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2815 /* ILLEGAL REQUEST */
2816 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2817 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2818 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2819 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2820 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2822 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
2826 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2828 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2829 * Solaris initiators. Returning NOT READY instead means the
2830 * operations will be retried a finite number of times and we
2831 * can survive intermittent errors.
2833 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2834 /* LOGICAL UNIT COMMUNICATION FAILURE */
2835 buffer
[SPC_ASC_KEY_OFFSET
] = 0x08;
2839 * This code uses linux/include/scsi/scsi.h SAM status codes!
2841 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
2843 * Automatically padded, this value is encoded in the fabric's
2844 * data_length response PDU containing the SCSI defined sense data.
2846 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
2849 trace_target_cmd_complete(cmd
);
2850 return cmd
->se_tfo
->queue_status(cmd
);
2852 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
2854 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
2856 if (!(cmd
->transport_state
& CMD_T_ABORTED
))
2860 * If cmd has been aborted but either no status is to be sent or it has
2861 * already been sent, just return
2863 if (!send_status
|| !(cmd
->se_cmd_flags
& SCF_SEND_DELAYED_TAS
))
2866 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2867 cmd
->t_task_cdb
[0], cmd
->se_tfo
->get_task_tag(cmd
));
2869 cmd
->se_cmd_flags
&= ~SCF_SEND_DELAYED_TAS
;
2870 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
2871 trace_target_cmd_complete(cmd
);
2872 cmd
->se_tfo
->queue_status(cmd
);
2876 EXPORT_SYMBOL(transport_check_aborted_status
);
2878 void transport_send_task_abort(struct se_cmd
*cmd
)
2880 unsigned long flags
;
2882 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2883 if (cmd
->se_cmd_flags
& (SCF_SENT_CHECK_CONDITION
)) {
2884 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2887 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2890 * If there are still expected incoming fabric WRITEs, we wait
2891 * until until they have completed before sending a TASK_ABORTED
2892 * response. This response with TASK_ABORTED status will be
2893 * queued back to fabric module by transport_check_aborted_status().
2895 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
2896 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
2897 cmd
->transport_state
|= CMD_T_ABORTED
;
2898 cmd
->se_cmd_flags
|= SCF_SEND_DELAYED_TAS
;
2899 smp_mb__after_atomic();
2903 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
2905 transport_lun_remove_cmd(cmd
);
2907 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2908 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
2909 cmd
->se_tfo
->get_task_tag(cmd
));
2911 trace_target_cmd_complete(cmd
);
2912 cmd
->se_tfo
->queue_status(cmd
);
2915 static void target_tmr_work(struct work_struct
*work
)
2917 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
2918 struct se_device
*dev
= cmd
->se_dev
;
2919 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
2922 switch (tmr
->function
) {
2923 case TMR_ABORT_TASK
:
2924 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
2926 case TMR_ABORT_TASK_SET
:
2928 case TMR_CLEAR_TASK_SET
:
2929 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
2932 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
2933 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
2934 TMR_FUNCTION_REJECTED
;
2936 case TMR_TARGET_WARM_RESET
:
2937 tmr
->response
= TMR_FUNCTION_REJECTED
;
2939 case TMR_TARGET_COLD_RESET
:
2940 tmr
->response
= TMR_FUNCTION_REJECTED
;
2943 pr_err("Uknown TMR function: 0x%02x.\n",
2945 tmr
->response
= TMR_FUNCTION_REJECTED
;
2949 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
2950 cmd
->se_tfo
->queue_tm_rsp(cmd
);
2952 transport_cmd_check_stop_to_fabric(cmd
);
2955 int transport_generic_handle_tmr(
2958 unsigned long flags
;
2960 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2961 cmd
->transport_state
|= CMD_T_ACTIVE
;
2962 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2964 INIT_WORK(&cmd
->work
, target_tmr_work
);
2965 queue_work(cmd
->se_dev
->tmr_wq
, &cmd
->work
);
2968 EXPORT_SYMBOL(transport_generic_handle_tmr
);