1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * (c) Copyright 2002-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/net.h>
27 #include <linux/delay.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/slab.h>
31 #include <linux/spinlock.h>
32 #include <linux/kthread.h>
34 #include <linux/cdrom.h>
35 #include <linux/module.h>
36 #include <linux/ratelimit.h>
37 #include <linux/vmalloc.h>
38 #include <asm/unaligned.h>
41 #include <scsi/scsi_proto.h>
43 #include <target/target_core_base.h>
44 #include <target/target_core_backend.h>
45 #include <target/target_core_fabric.h>
46 #include <target/target_core_configfs.h>
48 #include "target_core_internal.h"
49 #include "target_core_alua.h"
50 #include "target_core_pr.h"
51 #include "target_core_ua.h"
53 #define CREATE_TRACE_POINTS
54 #include <trace/events/target.h>
56 static struct workqueue_struct
*target_completion_wq
;
57 static struct kmem_cache
*se_sess_cache
;
58 struct kmem_cache
*se_ua_cache
;
59 struct kmem_cache
*t10_pr_reg_cache
;
60 struct kmem_cache
*t10_alua_lu_gp_cache
;
61 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
62 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
63 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
64 struct kmem_cache
*t10_alua_lba_map_cache
;
65 struct kmem_cache
*t10_alua_lba_map_mem_cache
;
67 static void transport_complete_task_attr(struct se_cmd
*cmd
);
68 static void transport_handle_queue_full(struct se_cmd
*cmd
,
69 struct se_device
*dev
);
70 static int transport_put_cmd(struct se_cmd
*cmd
);
71 static void target_complete_ok_work(struct work_struct
*work
);
73 int init_se_kmem_caches(void)
75 se_sess_cache
= kmem_cache_create("se_sess_cache",
76 sizeof(struct se_session
), __alignof__(struct se_session
),
79 pr_err("kmem_cache_create() for struct se_session"
83 se_ua_cache
= kmem_cache_create("se_ua_cache",
84 sizeof(struct se_ua
), __alignof__(struct se_ua
),
87 pr_err("kmem_cache_create() for struct se_ua failed\n");
88 goto out_free_sess_cache
;
90 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
91 sizeof(struct t10_pr_registration
),
92 __alignof__(struct t10_pr_registration
), 0, NULL
);
93 if (!t10_pr_reg_cache
) {
94 pr_err("kmem_cache_create() for struct t10_pr_registration"
96 goto out_free_ua_cache
;
98 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
99 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
101 if (!t10_alua_lu_gp_cache
) {
102 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
104 goto out_free_pr_reg_cache
;
106 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
107 sizeof(struct t10_alua_lu_gp_member
),
108 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
109 if (!t10_alua_lu_gp_mem_cache
) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
112 goto out_free_lu_gp_cache
;
114 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
115 sizeof(struct t10_alua_tg_pt_gp
),
116 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
117 if (!t10_alua_tg_pt_gp_cache
) {
118 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
120 goto out_free_lu_gp_mem_cache
;
122 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
123 "t10_alua_tg_pt_gp_mem_cache",
124 sizeof(struct t10_alua_tg_pt_gp_member
),
125 __alignof__(struct t10_alua_tg_pt_gp_member
),
127 if (!t10_alua_tg_pt_gp_mem_cache
) {
128 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
130 goto out_free_tg_pt_gp_cache
;
132 t10_alua_lba_map_cache
= kmem_cache_create(
133 "t10_alua_lba_map_cache",
134 sizeof(struct t10_alua_lba_map
),
135 __alignof__(struct t10_alua_lba_map
), 0, NULL
);
136 if (!t10_alua_lba_map_cache
) {
137 pr_err("kmem_cache_create() for t10_alua_lba_map_"
139 goto out_free_tg_pt_gp_mem_cache
;
141 t10_alua_lba_map_mem_cache
= kmem_cache_create(
142 "t10_alua_lba_map_mem_cache",
143 sizeof(struct t10_alua_lba_map_member
),
144 __alignof__(struct t10_alua_lba_map_member
), 0, NULL
);
145 if (!t10_alua_lba_map_mem_cache
) {
146 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
148 goto out_free_lba_map_cache
;
151 target_completion_wq
= alloc_workqueue("target_completion",
153 if (!target_completion_wq
)
154 goto out_free_lba_map_mem_cache
;
158 out_free_lba_map_mem_cache
:
159 kmem_cache_destroy(t10_alua_lba_map_mem_cache
);
160 out_free_lba_map_cache
:
161 kmem_cache_destroy(t10_alua_lba_map_cache
);
162 out_free_tg_pt_gp_mem_cache
:
163 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
164 out_free_tg_pt_gp_cache
:
165 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
166 out_free_lu_gp_mem_cache
:
167 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
168 out_free_lu_gp_cache
:
169 kmem_cache_destroy(t10_alua_lu_gp_cache
);
170 out_free_pr_reg_cache
:
171 kmem_cache_destroy(t10_pr_reg_cache
);
173 kmem_cache_destroy(se_ua_cache
);
175 kmem_cache_destroy(se_sess_cache
);
180 void release_se_kmem_caches(void)
182 destroy_workqueue(target_completion_wq
);
183 kmem_cache_destroy(se_sess_cache
);
184 kmem_cache_destroy(se_ua_cache
);
185 kmem_cache_destroy(t10_pr_reg_cache
);
186 kmem_cache_destroy(t10_alua_lu_gp_cache
);
187 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
188 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
190 kmem_cache_destroy(t10_alua_lba_map_cache
);
191 kmem_cache_destroy(t10_alua_lba_map_mem_cache
);
194 /* This code ensures unique mib indexes are handed out. */
195 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
196 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
199 * Allocate a new row index for the entry type specified
201 u32
scsi_get_new_index(scsi_index_t type
)
205 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
207 spin_lock(&scsi_mib_index_lock
);
208 new_index
= ++scsi_mib_index
[type
];
209 spin_unlock(&scsi_mib_index_lock
);
214 void transport_subsystem_check_init(void)
217 static int sub_api_initialized
;
219 if (sub_api_initialized
)
222 ret
= request_module("target_core_iblock");
224 pr_err("Unable to load target_core_iblock\n");
226 ret
= request_module("target_core_file");
228 pr_err("Unable to load target_core_file\n");
230 ret
= request_module("target_core_pscsi");
232 pr_err("Unable to load target_core_pscsi\n");
234 ret
= request_module("target_core_user");
236 pr_err("Unable to load target_core_user\n");
238 sub_api_initialized
= 1;
241 struct se_session
*transport_init_session(enum target_prot_op sup_prot_ops
)
243 struct se_session
*se_sess
;
245 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
247 pr_err("Unable to allocate struct se_session from"
249 return ERR_PTR(-ENOMEM
);
251 INIT_LIST_HEAD(&se_sess
->sess_list
);
252 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
253 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
254 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
255 spin_lock_init(&se_sess
->sess_cmd_lock
);
256 kref_init(&se_sess
->sess_kref
);
257 se_sess
->sup_prot_ops
= sup_prot_ops
;
261 EXPORT_SYMBOL(transport_init_session
);
263 int transport_alloc_session_tags(struct se_session
*se_sess
,
264 unsigned int tag_num
, unsigned int tag_size
)
268 se_sess
->sess_cmd_map
= kzalloc(tag_num
* tag_size
,
269 GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
270 if (!se_sess
->sess_cmd_map
) {
271 se_sess
->sess_cmd_map
= vzalloc(tag_num
* tag_size
);
272 if (!se_sess
->sess_cmd_map
) {
273 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
278 rc
= percpu_ida_init(&se_sess
->sess_tag_pool
, tag_num
);
280 pr_err("Unable to init se_sess->sess_tag_pool,"
281 " tag_num: %u\n", tag_num
);
282 kvfree(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 const struct target_core_fabric_ops
*tfo
= se_tpg
->se_tpg_tfo
;
322 unsigned char buf
[PR_REG_ISID_LEN
];
324 se_sess
->se_tpg
= se_tpg
;
325 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
327 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
329 * Only set for struct se_session's that will actually be moving I/O.
330 * eg: *NOT* discovery sessions.
335 * Determine if fabric allows for T10-PI feature bits exposed to
336 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
338 * If so, then always save prot_type on a per se_node_acl node
339 * basis and re-instate the previous sess_prot_type to avoid
340 * disabling PI from below any previously initiator side
343 if (se_nacl
->saved_prot_type
)
344 se_sess
->sess_prot_type
= se_nacl
->saved_prot_type
;
345 else if (tfo
->tpg_check_prot_fabric_only
)
346 se_sess
->sess_prot_type
= se_nacl
->saved_prot_type
=
347 tfo
->tpg_check_prot_fabric_only(se_tpg
);
349 * If the fabric module supports an ISID based TransportID,
350 * save this value in binary from the fabric I_T Nexus now.
352 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
353 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
354 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
355 &buf
[0], PR_REG_ISID_LEN
);
356 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
358 kref_get(&se_nacl
->acl_kref
);
360 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
362 * The se_nacl->nacl_sess pointer will be set to the
363 * last active I_T Nexus for each struct se_node_acl.
365 se_nacl
->nacl_sess
= se_sess
;
367 list_add_tail(&se_sess
->sess_acl_list
,
368 &se_nacl
->acl_sess_list
);
369 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
371 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
373 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
374 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
376 EXPORT_SYMBOL(__transport_register_session
);
378 void transport_register_session(
379 struct se_portal_group
*se_tpg
,
380 struct se_node_acl
*se_nacl
,
381 struct se_session
*se_sess
,
382 void *fabric_sess_ptr
)
386 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
387 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
388 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
390 EXPORT_SYMBOL(transport_register_session
);
392 static void target_release_session(struct kref
*kref
)
394 struct se_session
*se_sess
= container_of(kref
,
395 struct se_session
, sess_kref
);
396 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
398 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
401 void target_get_session(struct se_session
*se_sess
)
403 kref_get(&se_sess
->sess_kref
);
405 EXPORT_SYMBOL(target_get_session
);
407 void target_put_session(struct se_session
*se_sess
)
409 struct se_portal_group
*tpg
= se_sess
->se_tpg
;
411 if (tpg
->se_tpg_tfo
->put_session
!= NULL
) {
412 tpg
->se_tpg_tfo
->put_session(se_sess
);
415 kref_put(&se_sess
->sess_kref
, target_release_session
);
417 EXPORT_SYMBOL(target_put_session
);
419 ssize_t
target_show_dynamic_sessions(struct se_portal_group
*se_tpg
, char *page
)
421 struct se_session
*se_sess
;
424 spin_lock_bh(&se_tpg
->session_lock
);
425 list_for_each_entry(se_sess
, &se_tpg
->tpg_sess_list
, sess_list
) {
426 if (!se_sess
->se_node_acl
)
428 if (!se_sess
->se_node_acl
->dynamic_node_acl
)
430 if (strlen(se_sess
->se_node_acl
->initiatorname
) + 1 + len
> PAGE_SIZE
)
433 len
+= snprintf(page
+ len
, PAGE_SIZE
- len
, "%s\n",
434 se_sess
->se_node_acl
->initiatorname
);
435 len
+= 1; /* Include NULL terminator */
437 spin_unlock_bh(&se_tpg
->session_lock
);
441 EXPORT_SYMBOL(target_show_dynamic_sessions
);
443 static void target_complete_nacl(struct kref
*kref
)
445 struct se_node_acl
*nacl
= container_of(kref
,
446 struct se_node_acl
, acl_kref
);
448 complete(&nacl
->acl_free_comp
);
451 void target_put_nacl(struct se_node_acl
*nacl
)
453 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
456 void transport_deregister_session_configfs(struct se_session
*se_sess
)
458 struct se_node_acl
*se_nacl
;
461 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
463 se_nacl
= se_sess
->se_node_acl
;
465 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
466 if (se_nacl
->acl_stop
== 0)
467 list_del(&se_sess
->sess_acl_list
);
469 * If the session list is empty, then clear the pointer.
470 * Otherwise, set the struct se_session pointer from the tail
471 * element of the per struct se_node_acl active session list.
473 if (list_empty(&se_nacl
->acl_sess_list
))
474 se_nacl
->nacl_sess
= NULL
;
476 se_nacl
->nacl_sess
= container_of(
477 se_nacl
->acl_sess_list
.prev
,
478 struct se_session
, sess_acl_list
);
480 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
483 EXPORT_SYMBOL(transport_deregister_session_configfs
);
485 void transport_free_session(struct se_session
*se_sess
)
487 if (se_sess
->sess_cmd_map
) {
488 percpu_ida_destroy(&se_sess
->sess_tag_pool
);
489 kvfree(se_sess
->sess_cmd_map
);
491 kmem_cache_free(se_sess_cache
, se_sess
);
493 EXPORT_SYMBOL(transport_free_session
);
495 void transport_deregister_session(struct se_session
*se_sess
)
497 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
498 const struct target_core_fabric_ops
*se_tfo
;
499 struct se_node_acl
*se_nacl
;
501 bool comp_nacl
= true;
504 transport_free_session(se_sess
);
507 se_tfo
= se_tpg
->se_tpg_tfo
;
509 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
510 list_del(&se_sess
->sess_list
);
511 se_sess
->se_tpg
= NULL
;
512 se_sess
->fabric_sess_ptr
= NULL
;
513 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
516 * Determine if we need to do extra work for this initiator node's
517 * struct se_node_acl if it had been previously dynamically generated.
519 se_nacl
= se_sess
->se_node_acl
;
521 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
522 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
523 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
524 list_del(&se_nacl
->acl_list
);
525 se_tpg
->num_node_acls
--;
526 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
527 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
528 core_free_device_list_for_node(se_nacl
, se_tpg
);
529 se_tfo
->tpg_release_fabric_acl(se_tpg
, se_nacl
);
532 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
535 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
537 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
538 se_tpg
->se_tpg_tfo
->get_fabric_name());
540 * If last kref is dropping now for an explicit NodeACL, awake sleeping
541 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
544 if (se_nacl
&& comp_nacl
)
545 target_put_nacl(se_nacl
);
547 transport_free_session(se_sess
);
549 EXPORT_SYMBOL(transport_deregister_session
);
552 * Called with cmd->t_state_lock held.
554 static void target_remove_from_state_list(struct se_cmd
*cmd
)
556 struct se_device
*dev
= cmd
->se_dev
;
562 if (cmd
->transport_state
& CMD_T_BUSY
)
565 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
566 if (cmd
->state_active
) {
567 list_del(&cmd
->state_list
);
568 cmd
->state_active
= false;
570 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
573 static int transport_cmd_check_stop(struct se_cmd
*cmd
, bool remove_from_lists
,
578 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
580 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
582 if (remove_from_lists
) {
583 target_remove_from_state_list(cmd
);
586 * Clear struct se_cmd->se_lun before the handoff to FE.
592 * Determine if frontend context caller is requesting the stopping of
593 * this command for frontend exceptions.
595 if (cmd
->transport_state
& CMD_T_STOP
) {
596 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
598 cmd
->se_tfo
->get_task_tag(cmd
));
600 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
602 complete_all(&cmd
->t_transport_stop_comp
);
606 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
607 if (remove_from_lists
) {
609 * Some fabric modules like tcm_loop can release
610 * their internally allocated I/O reference now and
613 * Fabric modules are expected to return '1' here if the
614 * se_cmd being passed is released at this point,
615 * or zero if not being released.
617 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
618 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
619 return cmd
->se_tfo
->check_stop_free(cmd
);
623 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
627 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
629 return transport_cmd_check_stop(cmd
, true, false);
632 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
634 struct se_lun
*lun
= cmd
->se_lun
;
639 if (cmpxchg(&cmd
->lun_ref_active
, true, false))
640 percpu_ref_put(&lun
->lun_ref
);
643 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
645 if (cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)
646 transport_lun_remove_cmd(cmd
);
648 * Allow the fabric driver to unmap any resources before
649 * releasing the descriptor via TFO->release_cmd()
652 cmd
->se_tfo
->aborted_task(cmd
);
654 if (transport_cmd_check_stop_to_fabric(cmd
))
657 transport_put_cmd(cmd
);
660 static void target_complete_failure_work(struct work_struct
*work
)
662 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
664 transport_generic_request_failure(cmd
,
665 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
);
669 * Used when asking transport to copy Sense Data from the underlying
670 * Linux/SCSI struct scsi_cmnd
672 static unsigned char *transport_get_sense_buffer(struct se_cmd
*cmd
)
674 struct se_device
*dev
= cmd
->se_dev
;
676 WARN_ON(!cmd
->se_lun
);
681 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
)
684 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
686 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
687 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
688 return cmd
->sense_buffer
;
691 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
693 struct se_device
*dev
= cmd
->se_dev
;
694 int success
= scsi_status
== GOOD
;
697 cmd
->scsi_status
= scsi_status
;
700 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
701 cmd
->transport_state
&= ~CMD_T_BUSY
;
703 if (dev
&& dev
->transport
->transport_complete
) {
704 dev
->transport
->transport_complete(cmd
,
706 transport_get_sense_buffer(cmd
));
707 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
712 * See if we are waiting to complete for an exception condition.
714 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
715 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
716 complete(&cmd
->task_stop_comp
);
721 * Check for case where an explicit ABORT_TASK has been received
722 * and transport_wait_for_tasks() will be waiting for completion..
724 if (cmd
->transport_state
& CMD_T_ABORTED
&&
725 cmd
->transport_state
& CMD_T_STOP
) {
726 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
727 complete_all(&cmd
->t_transport_stop_comp
);
729 } else if (!success
) {
730 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
732 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
735 cmd
->t_state
= TRANSPORT_COMPLETE
;
736 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
737 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
739 queue_work(target_completion_wq
, &cmd
->work
);
741 EXPORT_SYMBOL(target_complete_cmd
);
743 void target_complete_cmd_with_length(struct se_cmd
*cmd
, u8 scsi_status
, int length
)
745 if (scsi_status
== SAM_STAT_GOOD
&& length
< cmd
->data_length
) {
746 if (cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
747 cmd
->residual_count
+= cmd
->data_length
- length
;
749 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
750 cmd
->residual_count
= cmd
->data_length
- length
;
753 cmd
->data_length
= length
;
756 target_complete_cmd(cmd
, scsi_status
);
758 EXPORT_SYMBOL(target_complete_cmd_with_length
);
760 static void target_add_to_state_list(struct se_cmd
*cmd
)
762 struct se_device
*dev
= cmd
->se_dev
;
765 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
766 if (!cmd
->state_active
) {
767 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
768 cmd
->state_active
= true;
770 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
774 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
776 static void transport_write_pending_qf(struct se_cmd
*cmd
);
777 static void transport_complete_qf(struct se_cmd
*cmd
);
779 void target_qf_do_work(struct work_struct
*work
)
781 struct se_device
*dev
= container_of(work
, struct se_device
,
783 LIST_HEAD(qf_cmd_list
);
784 struct se_cmd
*cmd
, *cmd_tmp
;
786 spin_lock_irq(&dev
->qf_cmd_lock
);
787 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
788 spin_unlock_irq(&dev
->qf_cmd_lock
);
790 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
791 list_del(&cmd
->se_qf_node
);
792 atomic_dec_mb(&dev
->dev_qf_count
);
794 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
795 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
796 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
797 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
800 if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
)
801 transport_write_pending_qf(cmd
);
802 else if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
)
803 transport_complete_qf(cmd
);
807 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
809 switch (cmd
->data_direction
) {
812 case DMA_FROM_DEVICE
:
816 case DMA_BIDIRECTIONAL
:
825 void transport_dump_dev_state(
826 struct se_device
*dev
,
830 *bl
+= sprintf(b
+ *bl
, "Status: ");
831 if (dev
->export_count
)
832 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
834 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
836 *bl
+= sprintf(b
+ *bl
, " Max Queue Depth: %d", dev
->queue_depth
);
837 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u HwMaxSectors: %u\n",
838 dev
->dev_attrib
.block_size
,
839 dev
->dev_attrib
.hw_max_sectors
);
840 *bl
+= sprintf(b
+ *bl
, " ");
843 void transport_dump_vpd_proto_id(
845 unsigned char *p_buf
,
848 unsigned char buf
[VPD_TMP_BUF_SIZE
];
851 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
852 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
854 switch (vpd
->protocol_identifier
) {
856 sprintf(buf
+len
, "Fibre Channel\n");
859 sprintf(buf
+len
, "Parallel SCSI\n");
862 sprintf(buf
+len
, "SSA\n");
865 sprintf(buf
+len
, "IEEE 1394\n");
868 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
872 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
875 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
878 sprintf(buf
+len
, "Automation/Drive Interface Transport"
882 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
885 sprintf(buf
+len
, "Unknown 0x%02x\n",
886 vpd
->protocol_identifier
);
891 strncpy(p_buf
, buf
, p_buf_len
);
897 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
900 * Check if the Protocol Identifier Valid (PIV) bit is set..
902 * from spc3r23.pdf section 7.5.1
904 if (page_83
[1] & 0x80) {
905 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
906 vpd
->protocol_identifier_set
= 1;
907 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
910 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
912 int transport_dump_vpd_assoc(
914 unsigned char *p_buf
,
917 unsigned char buf
[VPD_TMP_BUF_SIZE
];
921 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
922 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
924 switch (vpd
->association
) {
926 sprintf(buf
+len
, "addressed logical unit\n");
929 sprintf(buf
+len
, "target port\n");
932 sprintf(buf
+len
, "SCSI target device\n");
935 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
941 strncpy(p_buf
, buf
, p_buf_len
);
948 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
951 * The VPD identification association..
953 * from spc3r23.pdf Section 7.6.3.1 Table 297
955 vpd
->association
= (page_83
[1] & 0x30);
956 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
958 EXPORT_SYMBOL(transport_set_vpd_assoc
);
960 int transport_dump_vpd_ident_type(
962 unsigned char *p_buf
,
965 unsigned char buf
[VPD_TMP_BUF_SIZE
];
969 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
970 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
972 switch (vpd
->device_identifier_type
) {
974 sprintf(buf
+len
, "Vendor specific\n");
977 sprintf(buf
+len
, "T10 Vendor ID based\n");
980 sprintf(buf
+len
, "EUI-64 based\n");
983 sprintf(buf
+len
, "NAA\n");
986 sprintf(buf
+len
, "Relative target port identifier\n");
989 sprintf(buf
+len
, "SCSI name string\n");
992 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
993 vpd
->device_identifier_type
);
999 if (p_buf_len
< strlen(buf
)+1)
1001 strncpy(p_buf
, buf
, p_buf_len
);
1003 pr_debug("%s", buf
);
1009 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1012 * The VPD identifier type..
1014 * from spc3r23.pdf Section 7.6.3.1 Table 298
1016 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1017 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1019 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1021 int transport_dump_vpd_ident(
1022 struct t10_vpd
*vpd
,
1023 unsigned char *p_buf
,
1026 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1029 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1031 switch (vpd
->device_identifier_code_set
) {
1032 case 0x01: /* Binary */
1033 snprintf(buf
, sizeof(buf
),
1034 "T10 VPD Binary Device Identifier: %s\n",
1035 &vpd
->device_identifier
[0]);
1037 case 0x02: /* ASCII */
1038 snprintf(buf
, sizeof(buf
),
1039 "T10 VPD ASCII Device Identifier: %s\n",
1040 &vpd
->device_identifier
[0]);
1042 case 0x03: /* UTF-8 */
1043 snprintf(buf
, sizeof(buf
),
1044 "T10 VPD UTF-8 Device Identifier: %s\n",
1045 &vpd
->device_identifier
[0]);
1048 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1049 " 0x%02x", vpd
->device_identifier_code_set
);
1055 strncpy(p_buf
, buf
, p_buf_len
);
1057 pr_debug("%s", buf
);
1063 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1065 static const char hex_str
[] = "0123456789abcdef";
1066 int j
= 0, i
= 4; /* offset to start of the identifier */
1069 * The VPD Code Set (encoding)
1071 * from spc3r23.pdf Section 7.6.3.1 Table 296
1073 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1074 switch (vpd
->device_identifier_code_set
) {
1075 case 0x01: /* Binary */
1076 vpd
->device_identifier
[j
++] =
1077 hex_str
[vpd
->device_identifier_type
];
1078 while (i
< (4 + page_83
[3])) {
1079 vpd
->device_identifier
[j
++] =
1080 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1081 vpd
->device_identifier
[j
++] =
1082 hex_str
[page_83
[i
] & 0x0f];
1086 case 0x02: /* ASCII */
1087 case 0x03: /* UTF-8 */
1088 while (i
< (4 + page_83
[3]))
1089 vpd
->device_identifier
[j
++] = page_83
[i
++];
1095 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1097 EXPORT_SYMBOL(transport_set_vpd_ident
);
1100 target_cmd_size_check(struct se_cmd
*cmd
, unsigned int size
)
1102 struct se_device
*dev
= cmd
->se_dev
;
1104 if (cmd
->unknown_data_length
) {
1105 cmd
->data_length
= size
;
1106 } else if (size
!= cmd
->data_length
) {
1107 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1108 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1109 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
1110 cmd
->data_length
, size
, cmd
->t_task_cdb
[0]);
1112 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
1113 pr_err("Rejecting underflow/overflow"
1115 return TCM_INVALID_CDB_FIELD
;
1118 * Reject READ_* or WRITE_* with overflow/underflow for
1119 * type SCF_SCSI_DATA_CDB.
1121 if (dev
->dev_attrib
.block_size
!= 512) {
1122 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1123 " CDB on non 512-byte sector setup subsystem"
1124 " plugin: %s\n", dev
->transport
->name
);
1125 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1126 return TCM_INVALID_CDB_FIELD
;
1129 * For the overflow case keep the existing fabric provided
1130 * ->data_length. Otherwise for the underflow case, reset
1131 * ->data_length to the smaller SCSI expected data transfer
1134 if (size
> cmd
->data_length
) {
1135 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
1136 cmd
->residual_count
= (size
- cmd
->data_length
);
1138 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
1139 cmd
->residual_count
= (cmd
->data_length
- size
);
1140 cmd
->data_length
= size
;
1149 * Used by fabric modules containing a local struct se_cmd within their
1150 * fabric dependent per I/O descriptor.
1152 void transport_init_se_cmd(
1154 const struct target_core_fabric_ops
*tfo
,
1155 struct se_session
*se_sess
,
1159 unsigned char *sense_buffer
)
1161 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1162 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1163 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1164 INIT_LIST_HEAD(&cmd
->state_list
);
1165 init_completion(&cmd
->t_transport_stop_comp
);
1166 init_completion(&cmd
->cmd_wait_comp
);
1167 init_completion(&cmd
->task_stop_comp
);
1168 spin_lock_init(&cmd
->t_state_lock
);
1169 kref_init(&cmd
->cmd_kref
);
1170 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1173 cmd
->se_sess
= se_sess
;
1174 cmd
->data_length
= data_length
;
1175 cmd
->data_direction
= data_direction
;
1176 cmd
->sam_task_attr
= task_attr
;
1177 cmd
->sense_buffer
= sense_buffer
;
1179 cmd
->state_active
= false;
1181 EXPORT_SYMBOL(transport_init_se_cmd
);
1183 static sense_reason_t
1184 transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1186 struct se_device
*dev
= cmd
->se_dev
;
1189 * Check if SAM Task Attribute emulation is enabled for this
1190 * struct se_device storage object
1192 if (dev
->transport
->transport_flags
& TRANSPORT_FLAG_PASSTHROUGH
)
1195 if (cmd
->sam_task_attr
== TCM_ACA_TAG
) {
1196 pr_debug("SAM Task Attribute ACA"
1197 " emulation is not supported\n");
1198 return TCM_INVALID_CDB_FIELD
;
1201 * Used to determine when ORDERED commands should go from
1202 * Dormant to Active status.
1204 cmd
->se_ordered_id
= atomic_inc_return(&dev
->dev_ordered_id
);
1205 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1206 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1207 dev
->transport
->name
);
1212 target_setup_cmd_from_cdb(struct se_cmd
*cmd
, unsigned char *cdb
)
1214 struct se_device
*dev
= cmd
->se_dev
;
1218 * Ensure that the received CDB is less than the max (252 + 8) bytes
1219 * for VARIABLE_LENGTH_CMD
1221 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1222 pr_err("Received SCSI CDB with command_size: %d that"
1223 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1224 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1225 return TCM_INVALID_CDB_FIELD
;
1228 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1229 * allocate the additional extended CDB buffer now.. Otherwise
1230 * setup the pointer from __t_task_cdb to t_task_cdb.
1232 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1233 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1235 if (!cmd
->t_task_cdb
) {
1236 pr_err("Unable to allocate cmd->t_task_cdb"
1237 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1238 scsi_command_size(cdb
),
1239 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1240 return TCM_OUT_OF_RESOURCES
;
1243 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1245 * Copy the original CDB into cmd->
1247 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1249 trace_target_sequencer_start(cmd
);
1252 * Check for an existing UNIT ATTENTION condition
1254 ret
= target_scsi3_ua_check(cmd
);
1258 ret
= target_alua_state_check(cmd
);
1262 ret
= target_check_reservation(cmd
);
1264 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1268 ret
= dev
->transport
->parse_cdb(cmd
);
1272 ret
= transport_check_alloc_task_attr(cmd
);
1276 cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1278 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1279 if (cmd
->se_lun
->lun_sep
)
1280 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1281 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1284 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1287 * Used by fabric module frontends to queue tasks directly.
1288 * Many only be used from process context only
1290 int transport_handle_cdb_direct(
1297 pr_err("cmd->se_lun is NULL\n");
1300 if (in_interrupt()) {
1302 pr_err("transport_generic_handle_cdb cannot be called"
1303 " from interrupt context\n");
1307 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1308 * outstanding descriptors are handled correctly during shutdown via
1309 * transport_wait_for_tasks()
1311 * Also, we don't take cmd->t_state_lock here as we only expect
1312 * this to be called for initial descriptor submission.
1314 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1315 cmd
->transport_state
|= CMD_T_ACTIVE
;
1318 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1319 * so follow TRANSPORT_NEW_CMD processing thread context usage
1320 * and call transport_generic_request_failure() if necessary..
1322 ret
= transport_generic_new_cmd(cmd
);
1324 transport_generic_request_failure(cmd
, ret
);
1327 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1330 transport_generic_map_mem_to_cmd(struct se_cmd
*cmd
, struct scatterlist
*sgl
,
1331 u32 sgl_count
, struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
)
1333 if (!sgl
|| !sgl_count
)
1337 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1338 * scatterlists already have been set to follow what the fabric
1339 * passes for the original expected data transfer length.
1341 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
1342 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1343 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1344 return TCM_INVALID_CDB_FIELD
;
1347 cmd
->t_data_sg
= sgl
;
1348 cmd
->t_data_nents
= sgl_count
;
1350 if (sgl_bidi
&& sgl_bidi_count
) {
1351 cmd
->t_bidi_data_sg
= sgl_bidi
;
1352 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
1354 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
1359 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1360 * se_cmd + use pre-allocated SGL memory.
1362 * @se_cmd: command descriptor to submit
1363 * @se_sess: associated se_sess for endpoint
1364 * @cdb: pointer to SCSI CDB
1365 * @sense: pointer to SCSI sense buffer
1366 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1367 * @data_length: fabric expected data transfer length
1368 * @task_addr: SAM task attribute
1369 * @data_dir: DMA data direction
1370 * @flags: flags for command submission from target_sc_flags_tables
1371 * @sgl: struct scatterlist memory for unidirectional mapping
1372 * @sgl_count: scatterlist count for unidirectional mapping
1373 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1374 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1375 * @sgl_prot: struct scatterlist memory protection information
1376 * @sgl_prot_count: scatterlist count for protection information
1378 * Returns non zero to signal active I/O shutdown failure. All other
1379 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1380 * but still return zero here.
1382 * This may only be called from process context, and also currently
1383 * assumes internal allocation of fabric payload buffer by target-core.
1385 int target_submit_cmd_map_sgls(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1386 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1387 u32 data_length
, int task_attr
, int data_dir
, int flags
,
1388 struct scatterlist
*sgl
, u32 sgl_count
,
1389 struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
,
1390 struct scatterlist
*sgl_prot
, u32 sgl_prot_count
)
1392 struct se_portal_group
*se_tpg
;
1396 se_tpg
= se_sess
->se_tpg
;
1398 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1399 BUG_ON(in_interrupt());
1401 * Initialize se_cmd for target operation. From this point
1402 * exceptions are handled by sending exception status via
1403 * target_core_fabric_ops->queue_status() callback
1405 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1406 data_length
, data_dir
, task_attr
, sense
);
1407 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1408 se_cmd
->unknown_data_length
= 1;
1410 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1411 * se_sess->sess_cmd_list. A second kref_get here is necessary
1412 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1413 * kref_put() to happen during fabric packet acknowledgement.
1415 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1419 * Signal bidirectional data payloads to target-core
1421 if (flags
& TARGET_SCF_BIDI_OP
)
1422 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1424 * Locate se_lun pointer and attach it to struct se_cmd
1426 rc
= transport_lookup_cmd_lun(se_cmd
, unpacked_lun
);
1428 transport_send_check_condition_and_sense(se_cmd
, rc
, 0);
1429 target_put_sess_cmd(se_sess
, se_cmd
);
1433 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1435 transport_generic_request_failure(se_cmd
, rc
);
1440 * Save pointers for SGLs containing protection information,
1443 if (sgl_prot_count
) {
1444 se_cmd
->t_prot_sg
= sgl_prot
;
1445 se_cmd
->t_prot_nents
= sgl_prot_count
;
1449 * When a non zero sgl_count has been passed perform SGL passthrough
1450 * mapping for pre-allocated fabric memory instead of having target
1451 * core perform an internal SGL allocation..
1453 if (sgl_count
!= 0) {
1457 * A work-around for tcm_loop as some userspace code via
1458 * scsi-generic do not memset their associated read buffers,
1459 * so go ahead and do that here for type non-data CDBs. Also
1460 * note that this is currently guaranteed to be a single SGL
1461 * for this case by target core in target_setup_cmd_from_cdb()
1462 * -> transport_generic_cmd_sequencer().
1464 if (!(se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) &&
1465 se_cmd
->data_direction
== DMA_FROM_DEVICE
) {
1466 unsigned char *buf
= NULL
;
1469 buf
= kmap(sg_page(sgl
)) + sgl
->offset
;
1472 memset(buf
, 0, sgl
->length
);
1473 kunmap(sg_page(sgl
));
1477 rc
= transport_generic_map_mem_to_cmd(se_cmd
, sgl
, sgl_count
,
1478 sgl_bidi
, sgl_bidi_count
);
1480 transport_generic_request_failure(se_cmd
, rc
);
1486 * Check if we need to delay processing because of ALUA
1487 * Active/NonOptimized primary access state..
1489 core_alua_check_nonop_delay(se_cmd
);
1491 transport_handle_cdb_direct(se_cmd
);
1494 EXPORT_SYMBOL(target_submit_cmd_map_sgls
);
1497 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1499 * @se_cmd: command descriptor to submit
1500 * @se_sess: associated se_sess for endpoint
1501 * @cdb: pointer to SCSI CDB
1502 * @sense: pointer to SCSI sense buffer
1503 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1504 * @data_length: fabric expected data transfer length
1505 * @task_addr: SAM task attribute
1506 * @data_dir: DMA data direction
1507 * @flags: flags for command submission from target_sc_flags_tables
1509 * Returns non zero to signal active I/O shutdown failure. All other
1510 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1511 * but still return zero here.
1513 * This may only be called from process context, and also currently
1514 * assumes internal allocation of fabric payload buffer by target-core.
1516 * It also assumes interal target core SGL memory allocation.
1518 int target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1519 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1520 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1522 return target_submit_cmd_map_sgls(se_cmd
, se_sess
, cdb
, sense
,
1523 unpacked_lun
, data_length
, task_attr
, data_dir
,
1524 flags
, NULL
, 0, NULL
, 0, NULL
, 0);
1526 EXPORT_SYMBOL(target_submit_cmd
);
1528 static void target_complete_tmr_failure(struct work_struct
*work
)
1530 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1532 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1533 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1535 transport_cmd_check_stop_to_fabric(se_cmd
);
1539 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1542 * @se_cmd: command descriptor to submit
1543 * @se_sess: associated se_sess for endpoint
1544 * @sense: pointer to SCSI sense buffer
1545 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1546 * @fabric_context: fabric context for TMR req
1547 * @tm_type: Type of TM request
1548 * @gfp: gfp type for caller
1549 * @tag: referenced task tag for TMR_ABORT_TASK
1550 * @flags: submit cmd flags
1552 * Callable from all contexts.
1555 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1556 unsigned char *sense
, u32 unpacked_lun
,
1557 void *fabric_tmr_ptr
, unsigned char tm_type
,
1558 gfp_t gfp
, unsigned int tag
, int flags
)
1560 struct se_portal_group
*se_tpg
;
1563 se_tpg
= se_sess
->se_tpg
;
1566 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1567 0, DMA_NONE
, TCM_SIMPLE_TAG
, sense
);
1569 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1570 * allocation failure.
1572 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1576 if (tm_type
== TMR_ABORT_TASK
)
1577 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1579 /* See target_submit_cmd for commentary */
1580 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1582 core_tmr_release_req(se_cmd
->se_tmr_req
);
1586 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1589 * For callback during failure handling, push this work off
1590 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1592 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1593 schedule_work(&se_cmd
->work
);
1596 transport_generic_handle_tmr(se_cmd
);
1599 EXPORT_SYMBOL(target_submit_tmr
);
1602 * If the cmd is active, request it to be stopped and sleep until it
1605 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1606 __releases(&cmd
->t_state_lock
)
1607 __acquires(&cmd
->t_state_lock
)
1609 bool was_active
= false;
1611 if (cmd
->transport_state
& CMD_T_BUSY
) {
1612 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1613 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1615 pr_debug("cmd %p waiting to complete\n", cmd
);
1616 wait_for_completion(&cmd
->task_stop_comp
);
1617 pr_debug("cmd %p stopped successfully\n", cmd
);
1619 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1620 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1621 cmd
->transport_state
&= ~CMD_T_BUSY
;
1629 * Handle SAM-esque emulation for generic transport request failures.
1631 void transport_generic_request_failure(struct se_cmd
*cmd
,
1632 sense_reason_t sense_reason
)
1636 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1637 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1638 cmd
->t_task_cdb
[0]);
1639 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1640 cmd
->se_tfo
->get_cmd_state(cmd
),
1641 cmd
->t_state
, sense_reason
);
1642 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1643 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1644 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1645 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1648 * For SAM Task Attribute emulation for failed struct se_cmd
1650 transport_complete_task_attr(cmd
);
1652 * Handle special case for COMPARE_AND_WRITE failure, where the
1653 * callback is expected to drop the per device ->caw_sem.
1655 if ((cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
) &&
1656 cmd
->transport_complete_callback
)
1657 cmd
->transport_complete_callback(cmd
, false);
1659 switch (sense_reason
) {
1660 case TCM_NON_EXISTENT_LUN
:
1661 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1662 case TCM_INVALID_CDB_FIELD
:
1663 case TCM_INVALID_PARAMETER_LIST
:
1664 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
1665 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1666 case TCM_UNKNOWN_MODE_PAGE
:
1667 case TCM_WRITE_PROTECTED
:
1668 case TCM_ADDRESS_OUT_OF_RANGE
:
1669 case TCM_CHECK_CONDITION_ABORT_CMD
:
1670 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1671 case TCM_CHECK_CONDITION_NOT_READY
:
1672 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED
:
1673 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED
:
1674 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED
:
1676 case TCM_OUT_OF_RESOURCES
:
1677 sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1679 case TCM_RESERVATION_CONFLICT
:
1681 * No SENSE Data payload for this case, set SCSI Status
1682 * and queue the response to $FABRIC_MOD.
1684 * Uses linux/include/scsi/scsi.h SAM status codes defs
1686 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1688 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1689 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1692 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1695 cmd
->se_dev
->dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1696 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1697 cmd
->orig_fe_lun
, 0x2C,
1698 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1700 trace_target_cmd_complete(cmd
);
1701 ret
= cmd
->se_tfo
-> queue_status(cmd
);
1702 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1706 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1707 cmd
->t_task_cdb
[0], sense_reason
);
1708 sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1712 ret
= transport_send_check_condition_and_sense(cmd
, sense_reason
, 0);
1713 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1717 transport_lun_remove_cmd(cmd
);
1718 if (!transport_cmd_check_stop_to_fabric(cmd
))
1723 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1724 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1726 EXPORT_SYMBOL(transport_generic_request_failure
);
1728 void __target_execute_cmd(struct se_cmd
*cmd
)
1732 if (cmd
->execute_cmd
) {
1733 ret
= cmd
->execute_cmd(cmd
);
1735 spin_lock_irq(&cmd
->t_state_lock
);
1736 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1737 spin_unlock_irq(&cmd
->t_state_lock
);
1739 transport_generic_request_failure(cmd
, ret
);
1744 static int target_write_prot_action(struct se_cmd
*cmd
)
1748 * Perform WRITE_INSERT of PI using software emulation when backend
1749 * device has PI enabled, if the transport has not already generated
1750 * PI using hardware WRITE_INSERT offload.
1752 switch (cmd
->prot_op
) {
1753 case TARGET_PROT_DOUT_INSERT
:
1754 if (!(cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DOUT_INSERT
))
1755 sbc_dif_generate(cmd
);
1757 case TARGET_PROT_DOUT_STRIP
:
1758 if (cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DOUT_STRIP
)
1761 sectors
= cmd
->data_length
>> ilog2(cmd
->se_dev
->dev_attrib
.block_size
);
1762 cmd
->pi_err
= sbc_dif_verify_write(cmd
, cmd
->t_task_lba
,
1763 sectors
, 0, NULL
, 0);
1764 if (unlikely(cmd
->pi_err
)) {
1765 spin_lock_irq(&cmd
->t_state_lock
);
1766 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1767 spin_unlock_irq(&cmd
->t_state_lock
);
1768 transport_generic_request_failure(cmd
, cmd
->pi_err
);
1779 static bool target_handle_task_attr(struct se_cmd
*cmd
)
1781 struct se_device
*dev
= cmd
->se_dev
;
1783 if (dev
->transport
->transport_flags
& TRANSPORT_FLAG_PASSTHROUGH
)
1787 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1788 * to allow the passed struct se_cmd list of tasks to the front of the list.
1790 switch (cmd
->sam_task_attr
) {
1792 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1793 "se_ordered_id: %u\n",
1794 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1796 case TCM_ORDERED_TAG
:
1797 atomic_inc_mb(&dev
->dev_ordered_sync
);
1799 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1800 " se_ordered_id: %u\n",
1801 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1804 * Execute an ORDERED command if no other older commands
1805 * exist that need to be completed first.
1807 if (!atomic_read(&dev
->simple_cmds
))
1812 * For SIMPLE and UNTAGGED Task Attribute commands
1814 atomic_inc_mb(&dev
->simple_cmds
);
1818 if (atomic_read(&dev
->dev_ordered_sync
) == 0)
1821 spin_lock(&dev
->delayed_cmd_lock
);
1822 list_add_tail(&cmd
->se_delayed_node
, &dev
->delayed_cmd_list
);
1823 spin_unlock(&dev
->delayed_cmd_lock
);
1825 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1826 " delayed CMD list, se_ordered_id: %u\n",
1827 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1828 cmd
->se_ordered_id
);
1832 void target_execute_cmd(struct se_cmd
*cmd
)
1835 * If the received CDB has aleady been aborted stop processing it here.
1837 if (transport_check_aborted_status(cmd
, 1))
1841 * Determine if frontend context caller is requesting the stopping of
1842 * this command for frontend exceptions.
1844 spin_lock_irq(&cmd
->t_state_lock
);
1845 if (cmd
->transport_state
& CMD_T_STOP
) {
1846 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1848 cmd
->se_tfo
->get_task_tag(cmd
));
1850 spin_unlock_irq(&cmd
->t_state_lock
);
1851 complete_all(&cmd
->t_transport_stop_comp
);
1855 cmd
->t_state
= TRANSPORT_PROCESSING
;
1856 cmd
->transport_state
|= CMD_T_ACTIVE
|CMD_T_BUSY
|CMD_T_SENT
;
1857 spin_unlock_irq(&cmd
->t_state_lock
);
1859 if (target_write_prot_action(cmd
))
1862 if (target_handle_task_attr(cmd
)) {
1863 spin_lock_irq(&cmd
->t_state_lock
);
1864 cmd
->transport_state
&= ~(CMD_T_BUSY
| CMD_T_SENT
);
1865 spin_unlock_irq(&cmd
->t_state_lock
);
1869 __target_execute_cmd(cmd
);
1871 EXPORT_SYMBOL(target_execute_cmd
);
1874 * Process all commands up to the last received ORDERED task attribute which
1875 * requires another blocking boundary
1877 static void target_restart_delayed_cmds(struct se_device
*dev
)
1882 spin_lock(&dev
->delayed_cmd_lock
);
1883 if (list_empty(&dev
->delayed_cmd_list
)) {
1884 spin_unlock(&dev
->delayed_cmd_lock
);
1888 cmd
= list_entry(dev
->delayed_cmd_list
.next
,
1889 struct se_cmd
, se_delayed_node
);
1890 list_del(&cmd
->se_delayed_node
);
1891 spin_unlock(&dev
->delayed_cmd_lock
);
1893 __target_execute_cmd(cmd
);
1895 if (cmd
->sam_task_attr
== TCM_ORDERED_TAG
)
1901 * Called from I/O completion to determine which dormant/delayed
1902 * and ordered cmds need to have their tasks added to the execution queue.
1904 static void transport_complete_task_attr(struct se_cmd
*cmd
)
1906 struct se_device
*dev
= cmd
->se_dev
;
1908 if (dev
->transport
->transport_flags
& TRANSPORT_FLAG_PASSTHROUGH
)
1911 if (cmd
->sam_task_attr
== TCM_SIMPLE_TAG
) {
1912 atomic_dec_mb(&dev
->simple_cmds
);
1913 dev
->dev_cur_ordered_id
++;
1914 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1915 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
1916 cmd
->se_ordered_id
);
1917 } else if (cmd
->sam_task_attr
== TCM_HEAD_TAG
) {
1918 dev
->dev_cur_ordered_id
++;
1919 pr_debug("Incremented dev_cur_ordered_id: %u for"
1920 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
1921 cmd
->se_ordered_id
);
1922 } else if (cmd
->sam_task_attr
== TCM_ORDERED_TAG
) {
1923 atomic_dec_mb(&dev
->dev_ordered_sync
);
1925 dev
->dev_cur_ordered_id
++;
1926 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1927 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
1930 target_restart_delayed_cmds(dev
);
1933 static void transport_complete_qf(struct se_cmd
*cmd
)
1937 transport_complete_task_attr(cmd
);
1939 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1940 trace_target_cmd_complete(cmd
);
1941 ret
= cmd
->se_tfo
->queue_status(cmd
);
1945 switch (cmd
->data_direction
) {
1946 case DMA_FROM_DEVICE
:
1947 trace_target_cmd_complete(cmd
);
1948 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1951 if (cmd
->se_cmd_flags
& SCF_BIDI
) {
1952 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1955 /* Fall through for DMA_TO_DEVICE */
1957 trace_target_cmd_complete(cmd
);
1958 ret
= cmd
->se_tfo
->queue_status(cmd
);
1966 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1969 transport_lun_remove_cmd(cmd
);
1970 transport_cmd_check_stop_to_fabric(cmd
);
1973 static void transport_handle_queue_full(
1975 struct se_device
*dev
)
1977 spin_lock_irq(&dev
->qf_cmd_lock
);
1978 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
1979 atomic_inc_mb(&dev
->dev_qf_count
);
1980 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
1982 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1985 static bool target_read_prot_action(struct se_cmd
*cmd
)
1989 switch (cmd
->prot_op
) {
1990 case TARGET_PROT_DIN_STRIP
:
1991 if (!(cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DIN_STRIP
)) {
1992 rc
= sbc_dif_read_strip(cmd
);
1999 case TARGET_PROT_DIN_INSERT
:
2000 if (cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DIN_INSERT
)
2003 sbc_dif_generate(cmd
);
2012 static void target_complete_ok_work(struct work_struct
*work
)
2014 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
2018 * Check if we need to move delayed/dormant tasks from cmds on the
2019 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2022 transport_complete_task_attr(cmd
);
2025 * Check to schedule QUEUE_FULL work, or execute an existing
2026 * cmd->transport_qf_callback()
2028 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
2029 schedule_work(&cmd
->se_dev
->qf_work_queue
);
2032 * Check if we need to send a sense buffer from
2033 * the struct se_cmd in question.
2035 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
2036 WARN_ON(!cmd
->scsi_status
);
2037 ret
= transport_send_check_condition_and_sense(
2039 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2042 transport_lun_remove_cmd(cmd
);
2043 transport_cmd_check_stop_to_fabric(cmd
);
2047 * Check for a callback, used by amongst other things
2048 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
2050 if (cmd
->transport_complete_callback
) {
2053 rc
= cmd
->transport_complete_callback(cmd
, true);
2054 if (!rc
&& !(cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE_POST
)) {
2055 if ((cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
) &&
2061 ret
= transport_send_check_condition_and_sense(cmd
,
2063 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2066 transport_lun_remove_cmd(cmd
);
2067 transport_cmd_check_stop_to_fabric(cmd
);
2073 switch (cmd
->data_direction
) {
2074 case DMA_FROM_DEVICE
:
2075 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2076 if (cmd
->se_lun
->lun_sep
) {
2077 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
2080 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2082 * Perform READ_STRIP of PI using software emulation when
2083 * backend had PI enabled, if the transport will not be
2084 * performing hardware READ_STRIP offload.
2086 if (target_read_prot_action(cmd
)) {
2087 ret
= transport_send_check_condition_and_sense(cmd
,
2089 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2092 transport_lun_remove_cmd(cmd
);
2093 transport_cmd_check_stop_to_fabric(cmd
);
2097 trace_target_cmd_complete(cmd
);
2098 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2099 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2103 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2104 if (cmd
->se_lun
->lun_sep
) {
2105 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
2108 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2110 * Check if we need to send READ payload for BIDI-COMMAND
2112 if (cmd
->se_cmd_flags
& SCF_BIDI
) {
2113 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2114 if (cmd
->se_lun
->lun_sep
) {
2115 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
2118 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2119 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2120 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2124 /* Fall through for DMA_TO_DEVICE */
2126 trace_target_cmd_complete(cmd
);
2127 ret
= cmd
->se_tfo
->queue_status(cmd
);
2128 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2135 transport_lun_remove_cmd(cmd
);
2136 transport_cmd_check_stop_to_fabric(cmd
);
2140 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2141 " data_direction: %d\n", cmd
, cmd
->data_direction
);
2142 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
2143 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2146 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
2148 struct scatterlist
*sg
;
2151 for_each_sg(sgl
, sg
, nents
, count
)
2152 __free_page(sg_page(sg
));
2157 static inline void transport_reset_sgl_orig(struct se_cmd
*cmd
)
2160 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2161 * emulation, and free + reset pointers if necessary..
2163 if (!cmd
->t_data_sg_orig
)
2166 kfree(cmd
->t_data_sg
);
2167 cmd
->t_data_sg
= cmd
->t_data_sg_orig
;
2168 cmd
->t_data_sg_orig
= NULL
;
2169 cmd
->t_data_nents
= cmd
->t_data_nents_orig
;
2170 cmd
->t_data_nents_orig
= 0;
2173 static inline void transport_free_pages(struct se_cmd
*cmd
)
2175 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) {
2177 * Release special case READ buffer payload required for
2178 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2180 if (cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
) {
2181 transport_free_sgl(cmd
->t_bidi_data_sg
,
2182 cmd
->t_bidi_data_nents
);
2183 cmd
->t_bidi_data_sg
= NULL
;
2184 cmd
->t_bidi_data_nents
= 0;
2186 transport_reset_sgl_orig(cmd
);
2189 transport_reset_sgl_orig(cmd
);
2191 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
2192 cmd
->t_data_sg
= NULL
;
2193 cmd
->t_data_nents
= 0;
2195 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
2196 cmd
->t_bidi_data_sg
= NULL
;
2197 cmd
->t_bidi_data_nents
= 0;
2199 transport_free_sgl(cmd
->t_prot_sg
, cmd
->t_prot_nents
);
2200 cmd
->t_prot_sg
= NULL
;
2201 cmd
->t_prot_nents
= 0;
2205 * transport_release_cmd - free a command
2206 * @cmd: command to free
2208 * This routine unconditionally frees a command, and reference counting
2209 * or list removal must be done in the caller.
2211 static int transport_release_cmd(struct se_cmd
*cmd
)
2213 BUG_ON(!cmd
->se_tfo
);
2215 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
2216 core_tmr_release_req(cmd
->se_tmr_req
);
2217 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
2218 kfree(cmd
->t_task_cdb
);
2220 * If this cmd has been setup with target_get_sess_cmd(), drop
2221 * the kref and call ->release_cmd() in kref callback.
2223 return target_put_sess_cmd(cmd
->se_sess
, cmd
);
2227 * transport_put_cmd - release a reference to a command
2228 * @cmd: command to release
2230 * This routine releases our reference to the command and frees it if possible.
2232 static int transport_put_cmd(struct se_cmd
*cmd
)
2234 transport_free_pages(cmd
);
2235 return transport_release_cmd(cmd
);
2238 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
2240 struct scatterlist
*sg
= cmd
->t_data_sg
;
2241 struct page
**pages
;
2245 * We need to take into account a possible offset here for fabrics like
2246 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2247 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2249 if (!cmd
->t_data_nents
)
2253 if (cmd
->t_data_nents
== 1)
2254 return kmap(sg_page(sg
)) + sg
->offset
;
2256 /* >1 page. use vmap */
2257 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
2261 /* convert sg[] to pages[] */
2262 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
2263 pages
[i
] = sg_page(sg
);
2266 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
2268 if (!cmd
->t_data_vmap
)
2271 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
2273 EXPORT_SYMBOL(transport_kmap_data_sg
);
2275 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
2277 if (!cmd
->t_data_nents
) {
2279 } else if (cmd
->t_data_nents
== 1) {
2280 kunmap(sg_page(cmd
->t_data_sg
));
2284 vunmap(cmd
->t_data_vmap
);
2285 cmd
->t_data_vmap
= NULL
;
2287 EXPORT_SYMBOL(transport_kunmap_data_sg
);
2290 target_alloc_sgl(struct scatterlist
**sgl
, unsigned int *nents
, u32 length
,
2293 struct scatterlist
*sg
;
2295 gfp_t zero_flag
= (zero_page
) ? __GFP_ZERO
: 0;
2299 nent
= DIV_ROUND_UP(length
, PAGE_SIZE
);
2300 sg
= kmalloc(sizeof(struct scatterlist
) * nent
, GFP_KERNEL
);
2304 sg_init_table(sg
, nent
);
2307 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
2308 page
= alloc_page(GFP_KERNEL
| zero_flag
);
2312 sg_set_page(&sg
[i
], page
, page_len
, 0);
2323 __free_page(sg_page(&sg
[i
]));
2330 * Allocate any required resources to execute the command. For writes we
2331 * might not have the payload yet, so notify the fabric via a call to
2332 * ->write_pending instead. Otherwise place it on the execution queue.
2335 transport_generic_new_cmd(struct se_cmd
*cmd
)
2338 bool zero_flag
= !(cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
);
2341 * Determine is the TCM fabric module has already allocated physical
2342 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2345 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
2348 if ((cmd
->se_cmd_flags
& SCF_BIDI
) ||
2349 (cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
)) {
2352 if (cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
)
2353 bidi_length
= cmd
->t_task_nolb
*
2354 cmd
->se_dev
->dev_attrib
.block_size
;
2356 bidi_length
= cmd
->data_length
;
2358 ret
= target_alloc_sgl(&cmd
->t_bidi_data_sg
,
2359 &cmd
->t_bidi_data_nents
,
2360 bidi_length
, zero_flag
);
2362 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2365 if (cmd
->prot_op
!= TARGET_PROT_NORMAL
) {
2366 ret
= target_alloc_sgl(&cmd
->t_prot_sg
,
2368 cmd
->prot_length
, true);
2370 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2373 ret
= target_alloc_sgl(&cmd
->t_data_sg
, &cmd
->t_data_nents
,
2374 cmd
->data_length
, zero_flag
);
2376 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2377 } else if ((cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
) &&
2380 * Special case for COMPARE_AND_WRITE with fabrics
2381 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2383 u32 caw_length
= cmd
->t_task_nolb
*
2384 cmd
->se_dev
->dev_attrib
.block_size
;
2386 ret
= target_alloc_sgl(&cmd
->t_bidi_data_sg
,
2387 &cmd
->t_bidi_data_nents
,
2388 caw_length
, zero_flag
);
2390 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2393 * If this command is not a write we can execute it right here,
2394 * for write buffers we need to notify the fabric driver first
2395 * and let it call back once the write buffers are ready.
2397 target_add_to_state_list(cmd
);
2398 if (cmd
->data_direction
!= DMA_TO_DEVICE
|| cmd
->data_length
== 0) {
2399 target_execute_cmd(cmd
);
2402 transport_cmd_check_stop(cmd
, false, true);
2404 ret
= cmd
->se_tfo
->write_pending(cmd
);
2405 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2408 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2411 return (!ret
) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2414 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
2415 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
2416 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2419 EXPORT_SYMBOL(transport_generic_new_cmd
);
2421 static void transport_write_pending_qf(struct se_cmd
*cmd
)
2425 ret
= cmd
->se_tfo
->write_pending(cmd
);
2426 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
2427 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2429 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2433 int transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
2435 unsigned long flags
;
2438 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
2439 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
2440 transport_wait_for_tasks(cmd
);
2442 ret
= transport_release_cmd(cmd
);
2445 transport_wait_for_tasks(cmd
);
2447 * Handle WRITE failure case where transport_generic_new_cmd()
2448 * has already added se_cmd to state_list, but fabric has
2449 * failed command before I/O submission.
2451 if (cmd
->state_active
) {
2452 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2453 target_remove_from_state_list(cmd
);
2454 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2458 transport_lun_remove_cmd(cmd
);
2460 ret
= transport_put_cmd(cmd
);
2464 EXPORT_SYMBOL(transport_generic_free_cmd
);
2466 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2467 * @se_sess: session to reference
2468 * @se_cmd: command descriptor to add
2469 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2471 int target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
2474 unsigned long flags
;
2478 * Add a second kref if the fabric caller is expecting to handle
2479 * fabric acknowledgement that requires two target_put_sess_cmd()
2480 * invocations before se_cmd descriptor release.
2483 kref_get(&se_cmd
->cmd_kref
);
2485 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2486 if (se_sess
->sess_tearing_down
) {
2490 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
2492 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2494 if (ret
&& ack_kref
)
2495 target_put_sess_cmd(se_sess
, se_cmd
);
2499 EXPORT_SYMBOL(target_get_sess_cmd
);
2501 static void target_release_cmd_kref(struct kref
*kref
)
2502 __releases(&se_cmd
->se_sess
->sess_cmd_lock
)
2504 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
2505 struct se_session
*se_sess
= se_cmd
->se_sess
;
2507 if (list_empty(&se_cmd
->se_cmd_list
)) {
2508 spin_unlock(&se_sess
->sess_cmd_lock
);
2509 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2512 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
2513 spin_unlock(&se_sess
->sess_cmd_lock
);
2514 complete(&se_cmd
->cmd_wait_comp
);
2517 list_del(&se_cmd
->se_cmd_list
);
2518 spin_unlock(&se_sess
->sess_cmd_lock
);
2520 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2523 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2524 * @se_sess: session to reference
2525 * @se_cmd: command descriptor to drop
2527 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
2530 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2533 return kref_put_spinlock_irqsave(&se_cmd
->cmd_kref
, target_release_cmd_kref
,
2534 &se_sess
->sess_cmd_lock
);
2536 EXPORT_SYMBOL(target_put_sess_cmd
);
2538 /* target_sess_cmd_list_set_waiting - Flag all commands in
2539 * sess_cmd_list to complete cmd_wait_comp. Set
2540 * sess_tearing_down so no more commands are queued.
2541 * @se_sess: session to flag
2543 void target_sess_cmd_list_set_waiting(struct se_session
*se_sess
)
2545 struct se_cmd
*se_cmd
;
2546 unsigned long flags
;
2548 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2549 if (se_sess
->sess_tearing_down
) {
2550 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2553 se_sess
->sess_tearing_down
= 1;
2554 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
2556 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
2557 se_cmd
->cmd_wait_set
= 1;
2559 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2561 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting
);
2563 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2564 * @se_sess: session to wait for active I/O
2566 void target_wait_for_sess_cmds(struct se_session
*se_sess
)
2568 struct se_cmd
*se_cmd
, *tmp_cmd
;
2569 unsigned long flags
;
2571 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
2572 &se_sess
->sess_wait_list
, se_cmd_list
) {
2573 list_del(&se_cmd
->se_cmd_list
);
2575 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2576 " %d\n", se_cmd
, se_cmd
->t_state
,
2577 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2579 wait_for_completion(&se_cmd
->cmd_wait_comp
);
2580 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2581 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2582 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2584 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2587 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2588 WARN_ON(!list_empty(&se_sess
->sess_cmd_list
));
2589 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2592 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
2594 static int transport_clear_lun_ref_thread(void *p
)
2596 struct se_lun
*lun
= p
;
2598 percpu_ref_kill(&lun
->lun_ref
);
2600 wait_for_completion(&lun
->lun_ref_comp
);
2601 complete(&lun
->lun_shutdown_comp
);
2606 int transport_clear_lun_ref(struct se_lun
*lun
)
2608 struct task_struct
*kt
;
2610 kt
= kthread_run(transport_clear_lun_ref_thread
, lun
,
2611 "tcm_cl_%u", lun
->unpacked_lun
);
2613 pr_err("Unable to start clear_lun thread\n");
2616 wait_for_completion(&lun
->lun_shutdown_comp
);
2622 * transport_wait_for_tasks - wait for completion to occur
2623 * @cmd: command to wait
2625 * Called from frontend fabric context to wait for storage engine
2626 * to pause and/or release frontend generated struct se_cmd.
2628 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
2630 unsigned long flags
;
2632 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2633 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
2634 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2635 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2639 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
2640 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2641 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2645 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
2646 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2650 cmd
->transport_state
|= CMD_T_STOP
;
2652 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2653 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2654 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
2655 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2657 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2659 wait_for_completion(&cmd
->t_transport_stop_comp
);
2661 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2662 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
2664 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2665 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2666 cmd
->se_tfo
->get_task_tag(cmd
));
2668 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2672 EXPORT_SYMBOL(transport_wait_for_tasks
);
2674 static int transport_get_sense_codes(
2679 *asc
= cmd
->scsi_asc
;
2680 *ascq
= cmd
->scsi_ascq
;
2686 void transport_err_sector_info(unsigned char *buffer
, sector_t bad_sector
)
2688 /* Place failed LBA in sense data information descriptor 0. */
2689 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 0xc;
2690 buffer
[SPC_DESC_TYPE_OFFSET
] = 0; /* Information */
2691 buffer
[SPC_ADDITIONAL_DESC_LEN_OFFSET
] = 0xa;
2692 buffer
[SPC_VALIDITY_OFFSET
] = 0x80;
2694 /* Descriptor Information: failing sector */
2695 put_unaligned_be64(bad_sector
, &buffer
[12]);
2699 transport_send_check_condition_and_sense(struct se_cmd
*cmd
,
2700 sense_reason_t reason
, int from_transport
)
2702 unsigned char *buffer
= cmd
->sense_buffer
;
2703 unsigned long flags
;
2704 u8 asc
= 0, ascq
= 0;
2706 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2707 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2708 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2711 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
2712 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2714 if (!reason
&& from_transport
)
2717 if (!from_transport
)
2718 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
2721 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2722 * SENSE KEY values from include/scsi/scsi.h
2728 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2730 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2731 /* NO ADDITIONAL SENSE INFORMATION */
2732 buffer
[SPC_ASC_KEY_OFFSET
] = 0;
2733 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0;
2735 case TCM_NON_EXISTENT_LUN
:
2738 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2739 /* ILLEGAL REQUEST */
2740 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2741 /* LOGICAL UNIT NOT SUPPORTED */
2742 buffer
[SPC_ASC_KEY_OFFSET
] = 0x25;
2744 case TCM_UNSUPPORTED_SCSI_OPCODE
:
2745 case TCM_SECTOR_COUNT_TOO_MANY
:
2748 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2749 /* ILLEGAL REQUEST */
2750 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2751 /* INVALID COMMAND OPERATION CODE */
2752 buffer
[SPC_ASC_KEY_OFFSET
] = 0x20;
2754 case TCM_UNKNOWN_MODE_PAGE
:
2757 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2758 /* ILLEGAL REQUEST */
2759 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2760 /* INVALID FIELD IN CDB */
2761 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2763 case TCM_CHECK_CONDITION_ABORT_CMD
:
2766 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2767 /* ABORTED COMMAND */
2768 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2769 /* BUS DEVICE RESET FUNCTION OCCURRED */
2770 buffer
[SPC_ASC_KEY_OFFSET
] = 0x29;
2771 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2773 case TCM_INCORRECT_AMOUNT_OF_DATA
:
2776 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2777 /* ABORTED COMMAND */
2778 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2780 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2781 /* NOT ENOUGH UNSOLICITED DATA */
2782 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0d;
2784 case TCM_INVALID_CDB_FIELD
:
2787 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2788 /* ILLEGAL REQUEST */
2789 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2790 /* INVALID FIELD IN CDB */
2791 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2793 case TCM_INVALID_PARAMETER_LIST
:
2796 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2797 /* ILLEGAL REQUEST */
2798 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2799 /* INVALID FIELD IN PARAMETER LIST */
2800 buffer
[SPC_ASC_KEY_OFFSET
] = 0x26;
2802 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
2805 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2806 /* ILLEGAL REQUEST */
2807 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2808 /* PARAMETER LIST LENGTH ERROR */
2809 buffer
[SPC_ASC_KEY_OFFSET
] = 0x1a;
2811 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
2814 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2815 /* ABORTED COMMAND */
2816 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2818 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2819 /* UNEXPECTED_UNSOLICITED_DATA */
2820 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0c;
2822 case TCM_SERVICE_CRC_ERROR
:
2825 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2826 /* ABORTED COMMAND */
2827 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2828 /* PROTOCOL SERVICE CRC ERROR */
2829 buffer
[SPC_ASC_KEY_OFFSET
] = 0x47;
2831 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x05;
2833 case TCM_SNACK_REJECTED
:
2836 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2837 /* ABORTED COMMAND */
2838 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2840 buffer
[SPC_ASC_KEY_OFFSET
] = 0x11;
2841 /* FAILED RETRANSMISSION REQUEST */
2842 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x13;
2844 case TCM_WRITE_PROTECTED
:
2847 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2849 buffer
[SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
2850 /* WRITE PROTECTED */
2851 buffer
[SPC_ASC_KEY_OFFSET
] = 0x27;
2853 case TCM_ADDRESS_OUT_OF_RANGE
:
2856 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2857 /* ILLEGAL REQUEST */
2858 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2859 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2860 buffer
[SPC_ASC_KEY_OFFSET
] = 0x21;
2862 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
2865 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2866 /* UNIT ATTENTION */
2867 buffer
[SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
2868 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
2869 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2870 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2872 case TCM_CHECK_CONDITION_NOT_READY
:
2875 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2877 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2878 transport_get_sense_codes(cmd
, &asc
, &ascq
);
2879 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2880 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2882 case TCM_MISCOMPARE_VERIFY
:
2885 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2886 buffer
[SPC_SENSE_KEY_OFFSET
] = MISCOMPARE
;
2887 /* MISCOMPARE DURING VERIFY OPERATION */
2888 buffer
[SPC_ASC_KEY_OFFSET
] = 0x1d;
2889 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x00;
2891 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED
:
2894 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2895 /* ILLEGAL REQUEST */
2896 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2897 /* LOGICAL BLOCK GUARD CHECK FAILED */
2898 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2899 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x01;
2900 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2902 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED
:
2905 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2906 /* ILLEGAL REQUEST */
2907 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2908 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2909 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2910 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x02;
2911 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2913 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED
:
2916 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2917 /* ILLEGAL REQUEST */
2918 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2919 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2920 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2921 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2922 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2924 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
2928 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2930 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2931 * Solaris initiators. Returning NOT READY instead means the
2932 * operations will be retried a finite number of times and we
2933 * can survive intermittent errors.
2935 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2936 /* LOGICAL UNIT COMMUNICATION FAILURE */
2937 buffer
[SPC_ASC_KEY_OFFSET
] = 0x08;
2941 * This code uses linux/include/scsi/scsi.h SAM status codes!
2943 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
2945 * Automatically padded, this value is encoded in the fabric's
2946 * data_length response PDU containing the SCSI defined sense data.
2948 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
2951 trace_target_cmd_complete(cmd
);
2952 return cmd
->se_tfo
->queue_status(cmd
);
2954 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
2956 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
2958 if (!(cmd
->transport_state
& CMD_T_ABORTED
))
2962 * If cmd has been aborted but either no status is to be sent or it has
2963 * already been sent, just return
2965 if (!send_status
|| !(cmd
->se_cmd_flags
& SCF_SEND_DELAYED_TAS
))
2968 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2969 cmd
->t_task_cdb
[0], cmd
->se_tfo
->get_task_tag(cmd
));
2971 cmd
->se_cmd_flags
&= ~SCF_SEND_DELAYED_TAS
;
2972 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
2973 trace_target_cmd_complete(cmd
);
2974 cmd
->se_tfo
->queue_status(cmd
);
2978 EXPORT_SYMBOL(transport_check_aborted_status
);
2980 void transport_send_task_abort(struct se_cmd
*cmd
)
2982 unsigned long flags
;
2984 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2985 if (cmd
->se_cmd_flags
& (SCF_SENT_CHECK_CONDITION
)) {
2986 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2989 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2992 * If there are still expected incoming fabric WRITEs, we wait
2993 * until until they have completed before sending a TASK_ABORTED
2994 * response. This response with TASK_ABORTED status will be
2995 * queued back to fabric module by transport_check_aborted_status().
2997 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
2998 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
2999 cmd
->transport_state
|= CMD_T_ABORTED
;
3000 cmd
->se_cmd_flags
|= SCF_SEND_DELAYED_TAS
;
3004 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
3006 transport_lun_remove_cmd(cmd
);
3008 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3009 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
3010 cmd
->se_tfo
->get_task_tag(cmd
));
3012 trace_target_cmd_complete(cmd
);
3013 cmd
->se_tfo
->queue_status(cmd
);
3016 static void target_tmr_work(struct work_struct
*work
)
3018 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3019 struct se_device
*dev
= cmd
->se_dev
;
3020 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
3023 switch (tmr
->function
) {
3024 case TMR_ABORT_TASK
:
3025 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
3027 case TMR_ABORT_TASK_SET
:
3029 case TMR_CLEAR_TASK_SET
:
3030 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
3033 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
3034 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
3035 TMR_FUNCTION_REJECTED
;
3037 case TMR_TARGET_WARM_RESET
:
3038 tmr
->response
= TMR_FUNCTION_REJECTED
;
3040 case TMR_TARGET_COLD_RESET
:
3041 tmr
->response
= TMR_FUNCTION_REJECTED
;
3044 pr_err("Uknown TMR function: 0x%02x.\n",
3046 tmr
->response
= TMR_FUNCTION_REJECTED
;
3050 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
3051 cmd
->se_tfo
->queue_tm_rsp(cmd
);
3053 transport_cmd_check_stop_to_fabric(cmd
);
3056 int transport_generic_handle_tmr(
3059 unsigned long flags
;
3061 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3062 cmd
->transport_state
|= CMD_T_ACTIVE
;
3063 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3065 INIT_WORK(&cmd
->work
, target_tmr_work
);
3066 queue_work(cmd
->se_dev
->tmr_wq
, &cmd
->work
);
3069 EXPORT_SYMBOL(transport_generic_handle_tmr
);