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>
47 #include "target_core_internal.h"
48 #include "target_core_alua.h"
49 #include "target_core_pr.h"
50 #include "target_core_ua.h"
52 #define CREATE_TRACE_POINTS
53 #include <trace/events/target.h>
55 static struct workqueue_struct
*target_completion_wq
;
56 static struct kmem_cache
*se_sess_cache
;
57 struct kmem_cache
*se_ua_cache
;
58 struct kmem_cache
*t10_pr_reg_cache
;
59 struct kmem_cache
*t10_alua_lu_gp_cache
;
60 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
61 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
62 struct kmem_cache
*t10_alua_lba_map_cache
;
63 struct kmem_cache
*t10_alua_lba_map_mem_cache
;
65 static void transport_complete_task_attr(struct se_cmd
*cmd
);
66 static void transport_handle_queue_full(struct se_cmd
*cmd
,
67 struct se_device
*dev
);
68 static int transport_put_cmd(struct se_cmd
*cmd
);
69 static void target_complete_ok_work(struct work_struct
*work
);
71 int init_se_kmem_caches(void)
73 se_sess_cache
= kmem_cache_create("se_sess_cache",
74 sizeof(struct se_session
), __alignof__(struct se_session
),
77 pr_err("kmem_cache_create() for struct se_session"
81 se_ua_cache
= kmem_cache_create("se_ua_cache",
82 sizeof(struct se_ua
), __alignof__(struct se_ua
),
85 pr_err("kmem_cache_create() for struct se_ua failed\n");
86 goto out_free_sess_cache
;
88 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
89 sizeof(struct t10_pr_registration
),
90 __alignof__(struct t10_pr_registration
), 0, NULL
);
91 if (!t10_pr_reg_cache
) {
92 pr_err("kmem_cache_create() for struct t10_pr_registration"
94 goto out_free_ua_cache
;
96 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
97 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
99 if (!t10_alua_lu_gp_cache
) {
100 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
102 goto out_free_pr_reg_cache
;
104 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
105 sizeof(struct t10_alua_lu_gp_member
),
106 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
107 if (!t10_alua_lu_gp_mem_cache
) {
108 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
110 goto out_free_lu_gp_cache
;
112 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
113 sizeof(struct t10_alua_tg_pt_gp
),
114 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
115 if (!t10_alua_tg_pt_gp_cache
) {
116 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
118 goto out_free_lu_gp_mem_cache
;
120 t10_alua_lba_map_cache
= kmem_cache_create(
121 "t10_alua_lba_map_cache",
122 sizeof(struct t10_alua_lba_map
),
123 __alignof__(struct t10_alua_lba_map
), 0, NULL
);
124 if (!t10_alua_lba_map_cache
) {
125 pr_err("kmem_cache_create() for t10_alua_lba_map_"
127 goto out_free_tg_pt_gp_cache
;
129 t10_alua_lba_map_mem_cache
= kmem_cache_create(
130 "t10_alua_lba_map_mem_cache",
131 sizeof(struct t10_alua_lba_map_member
),
132 __alignof__(struct t10_alua_lba_map_member
), 0, NULL
);
133 if (!t10_alua_lba_map_mem_cache
) {
134 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
136 goto out_free_lba_map_cache
;
139 target_completion_wq
= alloc_workqueue("target_completion",
141 if (!target_completion_wq
)
142 goto out_free_lba_map_mem_cache
;
146 out_free_lba_map_mem_cache
:
147 kmem_cache_destroy(t10_alua_lba_map_mem_cache
);
148 out_free_lba_map_cache
:
149 kmem_cache_destroy(t10_alua_lba_map_cache
);
150 out_free_tg_pt_gp_cache
:
151 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
152 out_free_lu_gp_mem_cache
:
153 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
154 out_free_lu_gp_cache
:
155 kmem_cache_destroy(t10_alua_lu_gp_cache
);
156 out_free_pr_reg_cache
:
157 kmem_cache_destroy(t10_pr_reg_cache
);
159 kmem_cache_destroy(se_ua_cache
);
161 kmem_cache_destroy(se_sess_cache
);
166 void release_se_kmem_caches(void)
168 destroy_workqueue(target_completion_wq
);
169 kmem_cache_destroy(se_sess_cache
);
170 kmem_cache_destroy(se_ua_cache
);
171 kmem_cache_destroy(t10_pr_reg_cache
);
172 kmem_cache_destroy(t10_alua_lu_gp_cache
);
173 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
174 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
175 kmem_cache_destroy(t10_alua_lba_map_cache
);
176 kmem_cache_destroy(t10_alua_lba_map_mem_cache
);
179 /* This code ensures unique mib indexes are handed out. */
180 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
181 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
184 * Allocate a new row index for the entry type specified
186 u32
scsi_get_new_index(scsi_index_t type
)
190 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
192 spin_lock(&scsi_mib_index_lock
);
193 new_index
= ++scsi_mib_index
[type
];
194 spin_unlock(&scsi_mib_index_lock
);
199 void transport_subsystem_check_init(void)
202 static int sub_api_initialized
;
204 if (sub_api_initialized
)
207 ret
= request_module("target_core_iblock");
209 pr_err("Unable to load target_core_iblock\n");
211 ret
= request_module("target_core_file");
213 pr_err("Unable to load target_core_file\n");
215 ret
= request_module("target_core_pscsi");
217 pr_err("Unable to load target_core_pscsi\n");
219 ret
= request_module("target_core_user");
221 pr_err("Unable to load target_core_user\n");
223 sub_api_initialized
= 1;
226 struct se_session
*transport_init_session(enum target_prot_op sup_prot_ops
)
228 struct se_session
*se_sess
;
230 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
232 pr_err("Unable to allocate struct se_session from"
234 return ERR_PTR(-ENOMEM
);
236 INIT_LIST_HEAD(&se_sess
->sess_list
);
237 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
238 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
239 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
240 spin_lock_init(&se_sess
->sess_cmd_lock
);
241 kref_init(&se_sess
->sess_kref
);
242 se_sess
->sup_prot_ops
= sup_prot_ops
;
246 EXPORT_SYMBOL(transport_init_session
);
248 int transport_alloc_session_tags(struct se_session
*se_sess
,
249 unsigned int tag_num
, unsigned int tag_size
)
253 se_sess
->sess_cmd_map
= kzalloc(tag_num
* tag_size
,
254 GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
255 if (!se_sess
->sess_cmd_map
) {
256 se_sess
->sess_cmd_map
= vzalloc(tag_num
* tag_size
);
257 if (!se_sess
->sess_cmd_map
) {
258 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
263 rc
= percpu_ida_init(&se_sess
->sess_tag_pool
, tag_num
);
265 pr_err("Unable to init se_sess->sess_tag_pool,"
266 " tag_num: %u\n", tag_num
);
267 kvfree(se_sess
->sess_cmd_map
);
268 se_sess
->sess_cmd_map
= NULL
;
274 EXPORT_SYMBOL(transport_alloc_session_tags
);
276 struct se_session
*transport_init_session_tags(unsigned int tag_num
,
277 unsigned int tag_size
,
278 enum target_prot_op sup_prot_ops
)
280 struct se_session
*se_sess
;
283 se_sess
= transport_init_session(sup_prot_ops
);
287 rc
= transport_alloc_session_tags(se_sess
, tag_num
, tag_size
);
289 transport_free_session(se_sess
);
290 return ERR_PTR(-ENOMEM
);
295 EXPORT_SYMBOL(transport_init_session_tags
);
298 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
300 void __transport_register_session(
301 struct se_portal_group
*se_tpg
,
302 struct se_node_acl
*se_nacl
,
303 struct se_session
*se_sess
,
304 void *fabric_sess_ptr
)
306 const struct target_core_fabric_ops
*tfo
= se_tpg
->se_tpg_tfo
;
307 unsigned char buf
[PR_REG_ISID_LEN
];
309 se_sess
->se_tpg
= se_tpg
;
310 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
312 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
314 * Only set for struct se_session's that will actually be moving I/O.
315 * eg: *NOT* discovery sessions.
320 * Determine if fabric allows for T10-PI feature bits exposed to
321 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
323 * If so, then always save prot_type on a per se_node_acl node
324 * basis and re-instate the previous sess_prot_type to avoid
325 * disabling PI from below any previously initiator side
328 if (se_nacl
->saved_prot_type
)
329 se_sess
->sess_prot_type
= se_nacl
->saved_prot_type
;
330 else if (tfo
->tpg_check_prot_fabric_only
)
331 se_sess
->sess_prot_type
= se_nacl
->saved_prot_type
=
332 tfo
->tpg_check_prot_fabric_only(se_tpg
);
334 * If the fabric module supports an ISID based TransportID,
335 * save this value in binary from the fabric I_T Nexus now.
337 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
338 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
339 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
340 &buf
[0], PR_REG_ISID_LEN
);
341 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
343 kref_get(&se_nacl
->acl_kref
);
345 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
347 * The se_nacl->nacl_sess pointer will be set to the
348 * last active I_T Nexus for each struct se_node_acl.
350 se_nacl
->nacl_sess
= se_sess
;
352 list_add_tail(&se_sess
->sess_acl_list
,
353 &se_nacl
->acl_sess_list
);
354 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
356 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
358 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
359 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
361 EXPORT_SYMBOL(__transport_register_session
);
363 void transport_register_session(
364 struct se_portal_group
*se_tpg
,
365 struct se_node_acl
*se_nacl
,
366 struct se_session
*se_sess
,
367 void *fabric_sess_ptr
)
371 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
372 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
373 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
375 EXPORT_SYMBOL(transport_register_session
);
377 static void target_release_session(struct kref
*kref
)
379 struct se_session
*se_sess
= container_of(kref
,
380 struct se_session
, sess_kref
);
381 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
383 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
386 void target_get_session(struct se_session
*se_sess
)
388 kref_get(&se_sess
->sess_kref
);
390 EXPORT_SYMBOL(target_get_session
);
392 void target_put_session(struct se_session
*se_sess
)
394 kref_put(&se_sess
->sess_kref
, target_release_session
);
396 EXPORT_SYMBOL(target_put_session
);
398 ssize_t
target_show_dynamic_sessions(struct se_portal_group
*se_tpg
, char *page
)
400 struct se_session
*se_sess
;
403 spin_lock_bh(&se_tpg
->session_lock
);
404 list_for_each_entry(se_sess
, &se_tpg
->tpg_sess_list
, sess_list
) {
405 if (!se_sess
->se_node_acl
)
407 if (!se_sess
->se_node_acl
->dynamic_node_acl
)
409 if (strlen(se_sess
->se_node_acl
->initiatorname
) + 1 + len
> PAGE_SIZE
)
412 len
+= snprintf(page
+ len
, PAGE_SIZE
- len
, "%s\n",
413 se_sess
->se_node_acl
->initiatorname
);
414 len
+= 1; /* Include NULL terminator */
416 spin_unlock_bh(&se_tpg
->session_lock
);
420 EXPORT_SYMBOL(target_show_dynamic_sessions
);
422 static void target_complete_nacl(struct kref
*kref
)
424 struct se_node_acl
*nacl
= container_of(kref
,
425 struct se_node_acl
, acl_kref
);
427 complete(&nacl
->acl_free_comp
);
430 void target_put_nacl(struct se_node_acl
*nacl
)
432 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
435 void transport_deregister_session_configfs(struct se_session
*se_sess
)
437 struct se_node_acl
*se_nacl
;
440 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
442 se_nacl
= se_sess
->se_node_acl
;
444 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
445 if (se_nacl
->acl_stop
== 0)
446 list_del(&se_sess
->sess_acl_list
);
448 * If the session list is empty, then clear the pointer.
449 * Otherwise, set the struct se_session pointer from the tail
450 * element of the per struct se_node_acl active session list.
452 if (list_empty(&se_nacl
->acl_sess_list
))
453 se_nacl
->nacl_sess
= NULL
;
455 se_nacl
->nacl_sess
= container_of(
456 se_nacl
->acl_sess_list
.prev
,
457 struct se_session
, sess_acl_list
);
459 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
462 EXPORT_SYMBOL(transport_deregister_session_configfs
);
464 void transport_free_session(struct se_session
*se_sess
)
466 if (se_sess
->sess_cmd_map
) {
467 percpu_ida_destroy(&se_sess
->sess_tag_pool
);
468 kvfree(se_sess
->sess_cmd_map
);
470 kmem_cache_free(se_sess_cache
, se_sess
);
472 EXPORT_SYMBOL(transport_free_session
);
474 void transport_deregister_session(struct se_session
*se_sess
)
476 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
477 const struct target_core_fabric_ops
*se_tfo
;
478 struct se_node_acl
*se_nacl
;
480 bool comp_nacl
= true, drop_nacl
= false;
483 transport_free_session(se_sess
);
486 se_tfo
= se_tpg
->se_tpg_tfo
;
488 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
489 list_del(&se_sess
->sess_list
);
490 se_sess
->se_tpg
= NULL
;
491 se_sess
->fabric_sess_ptr
= NULL
;
492 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
495 * Determine if we need to do extra work for this initiator node's
496 * struct se_node_acl if it had been previously dynamically generated.
498 se_nacl
= se_sess
->se_node_acl
;
500 mutex_lock(&se_tpg
->acl_node_mutex
);
501 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
502 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
503 list_del(&se_nacl
->acl_list
);
504 se_tpg
->num_node_acls
--;
508 mutex_unlock(&se_tpg
->acl_node_mutex
);
511 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
512 core_free_device_list_for_node(se_nacl
, se_tpg
);
516 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
517 se_tpg
->se_tpg_tfo
->get_fabric_name());
519 * If last kref is dropping now for an explicit NodeACL, awake sleeping
520 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
523 if (se_nacl
&& comp_nacl
)
524 target_put_nacl(se_nacl
);
526 transport_free_session(se_sess
);
528 EXPORT_SYMBOL(transport_deregister_session
);
531 * Called with cmd->t_state_lock held.
533 static void target_remove_from_state_list(struct se_cmd
*cmd
)
535 struct se_device
*dev
= cmd
->se_dev
;
541 if (cmd
->transport_state
& CMD_T_BUSY
)
544 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
545 if (cmd
->state_active
) {
546 list_del(&cmd
->state_list
);
547 cmd
->state_active
= false;
549 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
552 static int transport_cmd_check_stop(struct se_cmd
*cmd
, bool remove_from_lists
,
557 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
559 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
561 if (remove_from_lists
) {
562 target_remove_from_state_list(cmd
);
565 * Clear struct se_cmd->se_lun before the handoff to FE.
571 * Determine if frontend context caller is requesting the stopping of
572 * this command for frontend exceptions.
574 if (cmd
->transport_state
& CMD_T_STOP
) {
575 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
576 __func__
, __LINE__
, cmd
->tag
);
578 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
580 complete_all(&cmd
->t_transport_stop_comp
);
584 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
585 if (remove_from_lists
) {
587 * Some fabric modules like tcm_loop can release
588 * their internally allocated I/O reference now and
591 * Fabric modules are expected to return '1' here if the
592 * se_cmd being passed is released at this point,
593 * or zero if not being released.
595 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
596 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
597 return cmd
->se_tfo
->check_stop_free(cmd
);
601 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
605 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
607 return transport_cmd_check_stop(cmd
, true, false);
610 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
612 struct se_lun
*lun
= cmd
->se_lun
;
617 if (cmpxchg(&cmd
->lun_ref_active
, true, false))
618 percpu_ref_put(&lun
->lun_ref
);
621 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
623 if (cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)
624 transport_lun_remove_cmd(cmd
);
626 * Allow the fabric driver to unmap any resources before
627 * releasing the descriptor via TFO->release_cmd()
630 cmd
->se_tfo
->aborted_task(cmd
);
632 if (transport_cmd_check_stop_to_fabric(cmd
))
635 transport_put_cmd(cmd
);
638 static void target_complete_failure_work(struct work_struct
*work
)
640 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
642 transport_generic_request_failure(cmd
,
643 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
);
647 * Used when asking transport to copy Sense Data from the underlying
648 * Linux/SCSI struct scsi_cmnd
650 static unsigned char *transport_get_sense_buffer(struct se_cmd
*cmd
)
652 struct se_device
*dev
= cmd
->se_dev
;
654 WARN_ON(!cmd
->se_lun
);
659 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
)
662 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
664 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
665 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
666 return cmd
->sense_buffer
;
669 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
671 struct se_device
*dev
= cmd
->se_dev
;
672 int success
= scsi_status
== GOOD
;
675 cmd
->scsi_status
= scsi_status
;
678 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
679 cmd
->transport_state
&= ~CMD_T_BUSY
;
681 if (dev
&& dev
->transport
->transport_complete
) {
682 dev
->transport
->transport_complete(cmd
,
684 transport_get_sense_buffer(cmd
));
685 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
690 * See if we are waiting to complete for an exception condition.
692 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
693 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
694 complete(&cmd
->task_stop_comp
);
699 * Check for case where an explicit ABORT_TASK has been received
700 * and transport_wait_for_tasks() will be waiting for completion..
702 if (cmd
->transport_state
& CMD_T_ABORTED
&&
703 cmd
->transport_state
& CMD_T_STOP
) {
704 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
705 complete_all(&cmd
->t_transport_stop_comp
);
707 } else if (!success
) {
708 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
710 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
713 cmd
->t_state
= TRANSPORT_COMPLETE
;
714 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
715 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
717 queue_work(target_completion_wq
, &cmd
->work
);
719 EXPORT_SYMBOL(target_complete_cmd
);
721 void target_complete_cmd_with_length(struct se_cmd
*cmd
, u8 scsi_status
, int length
)
723 if (scsi_status
== SAM_STAT_GOOD
&& length
< cmd
->data_length
) {
724 if (cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
725 cmd
->residual_count
+= cmd
->data_length
- length
;
727 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
728 cmd
->residual_count
= cmd
->data_length
- length
;
731 cmd
->data_length
= length
;
734 target_complete_cmd(cmd
, scsi_status
);
736 EXPORT_SYMBOL(target_complete_cmd_with_length
);
738 static void target_add_to_state_list(struct se_cmd
*cmd
)
740 struct se_device
*dev
= cmd
->se_dev
;
743 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
744 if (!cmd
->state_active
) {
745 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
746 cmd
->state_active
= true;
748 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
752 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
754 static void transport_write_pending_qf(struct se_cmd
*cmd
);
755 static void transport_complete_qf(struct se_cmd
*cmd
);
757 void target_qf_do_work(struct work_struct
*work
)
759 struct se_device
*dev
= container_of(work
, struct se_device
,
761 LIST_HEAD(qf_cmd_list
);
762 struct se_cmd
*cmd
, *cmd_tmp
;
764 spin_lock_irq(&dev
->qf_cmd_lock
);
765 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
766 spin_unlock_irq(&dev
->qf_cmd_lock
);
768 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
769 list_del(&cmd
->se_qf_node
);
770 atomic_dec_mb(&dev
->dev_qf_count
);
772 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
773 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
774 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
775 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
778 if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
)
779 transport_write_pending_qf(cmd
);
780 else if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
)
781 transport_complete_qf(cmd
);
785 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
787 switch (cmd
->data_direction
) {
790 case DMA_FROM_DEVICE
:
794 case DMA_BIDIRECTIONAL
:
803 void transport_dump_dev_state(
804 struct se_device
*dev
,
808 *bl
+= sprintf(b
+ *bl
, "Status: ");
809 if (dev
->export_count
)
810 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
812 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
814 *bl
+= sprintf(b
+ *bl
, " Max Queue Depth: %d", dev
->queue_depth
);
815 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u HwMaxSectors: %u\n",
816 dev
->dev_attrib
.block_size
,
817 dev
->dev_attrib
.hw_max_sectors
);
818 *bl
+= sprintf(b
+ *bl
, " ");
821 void transport_dump_vpd_proto_id(
823 unsigned char *p_buf
,
826 unsigned char buf
[VPD_TMP_BUF_SIZE
];
829 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
830 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
832 switch (vpd
->protocol_identifier
) {
834 sprintf(buf
+len
, "Fibre Channel\n");
837 sprintf(buf
+len
, "Parallel SCSI\n");
840 sprintf(buf
+len
, "SSA\n");
843 sprintf(buf
+len
, "IEEE 1394\n");
846 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
850 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
853 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
856 sprintf(buf
+len
, "Automation/Drive Interface Transport"
860 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
863 sprintf(buf
+len
, "Unknown 0x%02x\n",
864 vpd
->protocol_identifier
);
869 strncpy(p_buf
, buf
, p_buf_len
);
875 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
878 * Check if the Protocol Identifier Valid (PIV) bit is set..
880 * from spc3r23.pdf section 7.5.1
882 if (page_83
[1] & 0x80) {
883 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
884 vpd
->protocol_identifier_set
= 1;
885 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
888 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
890 int transport_dump_vpd_assoc(
892 unsigned char *p_buf
,
895 unsigned char buf
[VPD_TMP_BUF_SIZE
];
899 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
900 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
902 switch (vpd
->association
) {
904 sprintf(buf
+len
, "addressed logical unit\n");
907 sprintf(buf
+len
, "target port\n");
910 sprintf(buf
+len
, "SCSI target device\n");
913 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
919 strncpy(p_buf
, buf
, p_buf_len
);
926 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
929 * The VPD identification association..
931 * from spc3r23.pdf Section 7.6.3.1 Table 297
933 vpd
->association
= (page_83
[1] & 0x30);
934 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
936 EXPORT_SYMBOL(transport_set_vpd_assoc
);
938 int transport_dump_vpd_ident_type(
940 unsigned char *p_buf
,
943 unsigned char buf
[VPD_TMP_BUF_SIZE
];
947 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
948 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
950 switch (vpd
->device_identifier_type
) {
952 sprintf(buf
+len
, "Vendor specific\n");
955 sprintf(buf
+len
, "T10 Vendor ID based\n");
958 sprintf(buf
+len
, "EUI-64 based\n");
961 sprintf(buf
+len
, "NAA\n");
964 sprintf(buf
+len
, "Relative target port identifier\n");
967 sprintf(buf
+len
, "SCSI name string\n");
970 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
971 vpd
->device_identifier_type
);
977 if (p_buf_len
< strlen(buf
)+1)
979 strncpy(p_buf
, buf
, p_buf_len
);
987 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
990 * The VPD identifier type..
992 * from spc3r23.pdf Section 7.6.3.1 Table 298
994 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
995 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
997 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
999 int transport_dump_vpd_ident(
1000 struct t10_vpd
*vpd
,
1001 unsigned char *p_buf
,
1004 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1007 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1009 switch (vpd
->device_identifier_code_set
) {
1010 case 0x01: /* Binary */
1011 snprintf(buf
, sizeof(buf
),
1012 "T10 VPD Binary Device Identifier: %s\n",
1013 &vpd
->device_identifier
[0]);
1015 case 0x02: /* ASCII */
1016 snprintf(buf
, sizeof(buf
),
1017 "T10 VPD ASCII Device Identifier: %s\n",
1018 &vpd
->device_identifier
[0]);
1020 case 0x03: /* UTF-8 */
1021 snprintf(buf
, sizeof(buf
),
1022 "T10 VPD UTF-8 Device Identifier: %s\n",
1023 &vpd
->device_identifier
[0]);
1026 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1027 " 0x%02x", vpd
->device_identifier_code_set
);
1033 strncpy(p_buf
, buf
, p_buf_len
);
1035 pr_debug("%s", buf
);
1041 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1043 static const char hex_str
[] = "0123456789abcdef";
1044 int j
= 0, i
= 4; /* offset to start of the identifier */
1047 * The VPD Code Set (encoding)
1049 * from spc3r23.pdf Section 7.6.3.1 Table 296
1051 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1052 switch (vpd
->device_identifier_code_set
) {
1053 case 0x01: /* Binary */
1054 vpd
->device_identifier
[j
++] =
1055 hex_str
[vpd
->device_identifier_type
];
1056 while (i
< (4 + page_83
[3])) {
1057 vpd
->device_identifier
[j
++] =
1058 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1059 vpd
->device_identifier
[j
++] =
1060 hex_str
[page_83
[i
] & 0x0f];
1064 case 0x02: /* ASCII */
1065 case 0x03: /* UTF-8 */
1066 while (i
< (4 + page_83
[3]))
1067 vpd
->device_identifier
[j
++] = page_83
[i
++];
1073 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1075 EXPORT_SYMBOL(transport_set_vpd_ident
);
1078 target_cmd_size_check(struct se_cmd
*cmd
, unsigned int size
)
1080 struct se_device
*dev
= cmd
->se_dev
;
1082 if (cmd
->unknown_data_length
) {
1083 cmd
->data_length
= size
;
1084 } else if (size
!= cmd
->data_length
) {
1085 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1086 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1087 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
1088 cmd
->data_length
, size
, cmd
->t_task_cdb
[0]);
1090 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
1091 pr_err("Rejecting underflow/overflow"
1093 return TCM_INVALID_CDB_FIELD
;
1096 * Reject READ_* or WRITE_* with overflow/underflow for
1097 * type SCF_SCSI_DATA_CDB.
1099 if (dev
->dev_attrib
.block_size
!= 512) {
1100 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1101 " CDB on non 512-byte sector setup subsystem"
1102 " plugin: %s\n", dev
->transport
->name
);
1103 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1104 return TCM_INVALID_CDB_FIELD
;
1107 * For the overflow case keep the existing fabric provided
1108 * ->data_length. Otherwise for the underflow case, reset
1109 * ->data_length to the smaller SCSI expected data transfer
1112 if (size
> cmd
->data_length
) {
1113 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
1114 cmd
->residual_count
= (size
- cmd
->data_length
);
1116 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
1117 cmd
->residual_count
= (cmd
->data_length
- size
);
1118 cmd
->data_length
= size
;
1127 * Used by fabric modules containing a local struct se_cmd within their
1128 * fabric dependent per I/O descriptor.
1130 * Preserves the value of @cmd->tag.
1132 void transport_init_se_cmd(
1134 const struct target_core_fabric_ops
*tfo
,
1135 struct se_session
*se_sess
,
1139 unsigned char *sense_buffer
)
1141 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1142 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1143 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1144 INIT_LIST_HEAD(&cmd
->state_list
);
1145 init_completion(&cmd
->t_transport_stop_comp
);
1146 init_completion(&cmd
->cmd_wait_comp
);
1147 init_completion(&cmd
->task_stop_comp
);
1148 spin_lock_init(&cmd
->t_state_lock
);
1149 kref_init(&cmd
->cmd_kref
);
1150 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1153 cmd
->se_sess
= se_sess
;
1154 cmd
->data_length
= data_length
;
1155 cmd
->data_direction
= data_direction
;
1156 cmd
->sam_task_attr
= task_attr
;
1157 cmd
->sense_buffer
= sense_buffer
;
1159 cmd
->state_active
= false;
1161 EXPORT_SYMBOL(transport_init_se_cmd
);
1163 static sense_reason_t
1164 transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1166 struct se_device
*dev
= cmd
->se_dev
;
1169 * Check if SAM Task Attribute emulation is enabled for this
1170 * struct se_device storage object
1172 if (dev
->transport
->transport_flags
& TRANSPORT_FLAG_PASSTHROUGH
)
1175 if (cmd
->sam_task_attr
== TCM_ACA_TAG
) {
1176 pr_debug("SAM Task Attribute ACA"
1177 " emulation is not supported\n");
1178 return TCM_INVALID_CDB_FIELD
;
1181 * Used to determine when ORDERED commands should go from
1182 * Dormant to Active status.
1184 cmd
->se_ordered_id
= atomic_inc_return(&dev
->dev_ordered_id
);
1185 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1186 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1187 dev
->transport
->name
);
1192 target_setup_cmd_from_cdb(struct se_cmd
*cmd
, unsigned char *cdb
)
1194 struct se_device
*dev
= cmd
->se_dev
;
1198 * Ensure that the received CDB is less than the max (252 + 8) bytes
1199 * for VARIABLE_LENGTH_CMD
1201 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1202 pr_err("Received SCSI CDB with command_size: %d that"
1203 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1204 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1205 return TCM_INVALID_CDB_FIELD
;
1208 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1209 * allocate the additional extended CDB buffer now.. Otherwise
1210 * setup the pointer from __t_task_cdb to t_task_cdb.
1212 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1213 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1215 if (!cmd
->t_task_cdb
) {
1216 pr_err("Unable to allocate cmd->t_task_cdb"
1217 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1218 scsi_command_size(cdb
),
1219 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1220 return TCM_OUT_OF_RESOURCES
;
1223 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1225 * Copy the original CDB into cmd->
1227 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1229 trace_target_sequencer_start(cmd
);
1232 * Check for an existing UNIT ATTENTION condition
1234 ret
= target_scsi3_ua_check(cmd
);
1238 ret
= target_alua_state_check(cmd
);
1242 ret
= target_check_reservation(cmd
);
1244 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1248 ret
= dev
->transport
->parse_cdb(cmd
);
1252 ret
= transport_check_alloc_task_attr(cmd
);
1256 cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1257 atomic_long_inc(&cmd
->se_lun
->lun_stats
.cmd_pdus
);
1260 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1263 * Used by fabric module frontends to queue tasks directly.
1264 * Many only be used from process context only
1266 int transport_handle_cdb_direct(
1273 pr_err("cmd->se_lun is NULL\n");
1276 if (in_interrupt()) {
1278 pr_err("transport_generic_handle_cdb cannot be called"
1279 " from interrupt context\n");
1283 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1284 * outstanding descriptors are handled correctly during shutdown via
1285 * transport_wait_for_tasks()
1287 * Also, we don't take cmd->t_state_lock here as we only expect
1288 * this to be called for initial descriptor submission.
1290 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1291 cmd
->transport_state
|= CMD_T_ACTIVE
;
1294 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1295 * so follow TRANSPORT_NEW_CMD processing thread context usage
1296 * and call transport_generic_request_failure() if necessary..
1298 ret
= transport_generic_new_cmd(cmd
);
1300 transport_generic_request_failure(cmd
, ret
);
1303 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1306 transport_generic_map_mem_to_cmd(struct se_cmd
*cmd
, struct scatterlist
*sgl
,
1307 u32 sgl_count
, struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
)
1309 if (!sgl
|| !sgl_count
)
1313 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1314 * scatterlists already have been set to follow what the fabric
1315 * passes for the original expected data transfer length.
1317 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
1318 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1319 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1320 return TCM_INVALID_CDB_FIELD
;
1323 cmd
->t_data_sg
= sgl
;
1324 cmd
->t_data_nents
= sgl_count
;
1325 cmd
->t_bidi_data_sg
= sgl_bidi
;
1326 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
1328 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
1333 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1334 * se_cmd + use pre-allocated SGL memory.
1336 * @se_cmd: command descriptor to submit
1337 * @se_sess: associated se_sess for endpoint
1338 * @cdb: pointer to SCSI CDB
1339 * @sense: pointer to SCSI sense buffer
1340 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1341 * @data_length: fabric expected data transfer length
1342 * @task_addr: SAM task attribute
1343 * @data_dir: DMA data direction
1344 * @flags: flags for command submission from target_sc_flags_tables
1345 * @sgl: struct scatterlist memory for unidirectional mapping
1346 * @sgl_count: scatterlist count for unidirectional mapping
1347 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1348 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1349 * @sgl_prot: struct scatterlist memory protection information
1350 * @sgl_prot_count: scatterlist count for protection information
1352 * Task tags are supported if the caller has set @se_cmd->tag.
1354 * Returns non zero to signal active I/O shutdown failure. All other
1355 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1356 * but still return zero here.
1358 * This may only be called from process context, and also currently
1359 * assumes internal allocation of fabric payload buffer by target-core.
1361 int target_submit_cmd_map_sgls(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1362 unsigned char *cdb
, unsigned char *sense
, u64 unpacked_lun
,
1363 u32 data_length
, int task_attr
, int data_dir
, int flags
,
1364 struct scatterlist
*sgl
, u32 sgl_count
,
1365 struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
,
1366 struct scatterlist
*sgl_prot
, u32 sgl_prot_count
)
1368 struct se_portal_group
*se_tpg
;
1372 se_tpg
= se_sess
->se_tpg
;
1374 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1375 BUG_ON(in_interrupt());
1377 * Initialize se_cmd for target operation. From this point
1378 * exceptions are handled by sending exception status via
1379 * target_core_fabric_ops->queue_status() callback
1381 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1382 data_length
, data_dir
, task_attr
, sense
);
1383 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1384 se_cmd
->unknown_data_length
= 1;
1386 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1387 * se_sess->sess_cmd_list. A second kref_get here is necessary
1388 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1389 * kref_put() to happen during fabric packet acknowledgement.
1391 ret
= target_get_sess_cmd(se_cmd
, flags
& TARGET_SCF_ACK_KREF
);
1395 * Signal bidirectional data payloads to target-core
1397 if (flags
& TARGET_SCF_BIDI_OP
)
1398 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1400 * Locate se_lun pointer and attach it to struct se_cmd
1402 rc
= transport_lookup_cmd_lun(se_cmd
, unpacked_lun
);
1404 transport_send_check_condition_and_sense(se_cmd
, rc
, 0);
1405 target_put_sess_cmd(se_cmd
);
1409 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1411 transport_generic_request_failure(se_cmd
, rc
);
1416 * Save pointers for SGLs containing protection information,
1419 if (sgl_prot_count
) {
1420 se_cmd
->t_prot_sg
= sgl_prot
;
1421 se_cmd
->t_prot_nents
= sgl_prot_count
;
1422 se_cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC
;
1426 * When a non zero sgl_count has been passed perform SGL passthrough
1427 * mapping for pre-allocated fabric memory instead of having target
1428 * core perform an internal SGL allocation..
1430 if (sgl_count
!= 0) {
1434 * A work-around for tcm_loop as some userspace code via
1435 * scsi-generic do not memset their associated read buffers,
1436 * so go ahead and do that here for type non-data CDBs. Also
1437 * note that this is currently guaranteed to be a single SGL
1438 * for this case by target core in target_setup_cmd_from_cdb()
1439 * -> transport_generic_cmd_sequencer().
1441 if (!(se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) &&
1442 se_cmd
->data_direction
== DMA_FROM_DEVICE
) {
1443 unsigned char *buf
= NULL
;
1446 buf
= kmap(sg_page(sgl
)) + sgl
->offset
;
1449 memset(buf
, 0, sgl
->length
);
1450 kunmap(sg_page(sgl
));
1454 rc
= transport_generic_map_mem_to_cmd(se_cmd
, sgl
, sgl_count
,
1455 sgl_bidi
, sgl_bidi_count
);
1457 transport_generic_request_failure(se_cmd
, rc
);
1463 * Check if we need to delay processing because of ALUA
1464 * Active/NonOptimized primary access state..
1466 core_alua_check_nonop_delay(se_cmd
);
1468 transport_handle_cdb_direct(se_cmd
);
1471 EXPORT_SYMBOL(target_submit_cmd_map_sgls
);
1474 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1476 * @se_cmd: command descriptor to submit
1477 * @se_sess: associated se_sess for endpoint
1478 * @cdb: pointer to SCSI CDB
1479 * @sense: pointer to SCSI sense buffer
1480 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1481 * @data_length: fabric expected data transfer length
1482 * @task_addr: SAM task attribute
1483 * @data_dir: DMA data direction
1484 * @flags: flags for command submission from target_sc_flags_tables
1486 * Task tags are supported if the caller has set @se_cmd->tag.
1488 * Returns non zero to signal active I/O shutdown failure. All other
1489 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1490 * but still return zero here.
1492 * This may only be called from process context, and also currently
1493 * assumes internal allocation of fabric payload buffer by target-core.
1495 * It also assumes interal target core SGL memory allocation.
1497 int target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1498 unsigned char *cdb
, unsigned char *sense
, u64 unpacked_lun
,
1499 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1501 return target_submit_cmd_map_sgls(se_cmd
, se_sess
, cdb
, sense
,
1502 unpacked_lun
, data_length
, task_attr
, data_dir
,
1503 flags
, NULL
, 0, NULL
, 0, NULL
, 0);
1505 EXPORT_SYMBOL(target_submit_cmd
);
1507 static void target_complete_tmr_failure(struct work_struct
*work
)
1509 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1511 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1512 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1514 transport_cmd_check_stop_to_fabric(se_cmd
);
1518 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1521 * @se_cmd: command descriptor to submit
1522 * @se_sess: associated se_sess for endpoint
1523 * @sense: pointer to SCSI sense buffer
1524 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1525 * @fabric_context: fabric context for TMR req
1526 * @tm_type: Type of TM request
1527 * @gfp: gfp type for caller
1528 * @tag: referenced task tag for TMR_ABORT_TASK
1529 * @flags: submit cmd flags
1531 * Callable from all contexts.
1534 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1535 unsigned char *sense
, u64 unpacked_lun
,
1536 void *fabric_tmr_ptr
, unsigned char tm_type
,
1537 gfp_t gfp
, unsigned int tag
, int flags
)
1539 struct se_portal_group
*se_tpg
;
1542 se_tpg
= se_sess
->se_tpg
;
1545 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1546 0, DMA_NONE
, TCM_SIMPLE_TAG
, sense
);
1548 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1549 * allocation failure.
1551 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1555 if (tm_type
== TMR_ABORT_TASK
)
1556 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1558 /* See target_submit_cmd for commentary */
1559 ret
= target_get_sess_cmd(se_cmd
, flags
& TARGET_SCF_ACK_KREF
);
1561 core_tmr_release_req(se_cmd
->se_tmr_req
);
1565 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1568 * For callback during failure handling, push this work off
1569 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1571 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1572 schedule_work(&se_cmd
->work
);
1575 transport_generic_handle_tmr(se_cmd
);
1578 EXPORT_SYMBOL(target_submit_tmr
);
1581 * If the cmd is active, request it to be stopped and sleep until it
1584 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1585 __releases(&cmd
->t_state_lock
)
1586 __acquires(&cmd
->t_state_lock
)
1588 bool was_active
= false;
1590 if (cmd
->transport_state
& CMD_T_BUSY
) {
1591 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1592 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1594 pr_debug("cmd %p waiting to complete\n", cmd
);
1595 wait_for_completion(&cmd
->task_stop_comp
);
1596 pr_debug("cmd %p stopped successfully\n", cmd
);
1598 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1599 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1600 cmd
->transport_state
&= ~CMD_T_BUSY
;
1608 * Handle SAM-esque emulation for generic transport request failures.
1610 void transport_generic_request_failure(struct se_cmd
*cmd
,
1611 sense_reason_t sense_reason
)
1615 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1616 " CDB: 0x%02x\n", cmd
, cmd
->tag
, cmd
->t_task_cdb
[0]);
1617 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1618 cmd
->se_tfo
->get_cmd_state(cmd
),
1619 cmd
->t_state
, sense_reason
);
1620 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1621 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1622 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1623 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1626 * For SAM Task Attribute emulation for failed struct se_cmd
1628 transport_complete_task_attr(cmd
);
1630 * Handle special case for COMPARE_AND_WRITE failure, where the
1631 * callback is expected to drop the per device ->caw_sem.
1633 if ((cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
) &&
1634 cmd
->transport_complete_callback
)
1635 cmd
->transport_complete_callback(cmd
, false);
1637 switch (sense_reason
) {
1638 case TCM_NON_EXISTENT_LUN
:
1639 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1640 case TCM_INVALID_CDB_FIELD
:
1641 case TCM_INVALID_PARAMETER_LIST
:
1642 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
1643 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1644 case TCM_UNKNOWN_MODE_PAGE
:
1645 case TCM_WRITE_PROTECTED
:
1646 case TCM_ADDRESS_OUT_OF_RANGE
:
1647 case TCM_CHECK_CONDITION_ABORT_CMD
:
1648 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1649 case TCM_CHECK_CONDITION_NOT_READY
:
1650 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED
:
1651 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED
:
1652 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED
:
1654 case TCM_OUT_OF_RESOURCES
:
1655 sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1657 case TCM_RESERVATION_CONFLICT
:
1659 * No SENSE Data payload for this case, set SCSI Status
1660 * and queue the response to $FABRIC_MOD.
1662 * Uses linux/include/scsi/scsi.h SAM status codes defs
1664 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1666 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1667 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1670 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1673 cmd
->se_dev
->dev_attrib
.emulate_ua_intlck_ctrl
== 2) {
1674 target_ua_allocate_lun(cmd
->se_sess
->se_node_acl
,
1675 cmd
->orig_fe_lun
, 0x2C,
1676 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1678 trace_target_cmd_complete(cmd
);
1679 ret
= cmd
->se_tfo
->queue_status(cmd
);
1680 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1684 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1685 cmd
->t_task_cdb
[0], sense_reason
);
1686 sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1690 ret
= transport_send_check_condition_and_sense(cmd
, sense_reason
, 0);
1691 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1695 transport_lun_remove_cmd(cmd
);
1696 if (!transport_cmd_check_stop_to_fabric(cmd
))
1701 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1702 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1704 EXPORT_SYMBOL(transport_generic_request_failure
);
1706 void __target_execute_cmd(struct se_cmd
*cmd
)
1710 if (cmd
->execute_cmd
) {
1711 ret
= cmd
->execute_cmd(cmd
);
1713 spin_lock_irq(&cmd
->t_state_lock
);
1714 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1715 spin_unlock_irq(&cmd
->t_state_lock
);
1717 transport_generic_request_failure(cmd
, ret
);
1722 static int target_write_prot_action(struct se_cmd
*cmd
)
1726 * Perform WRITE_INSERT of PI using software emulation when backend
1727 * device has PI enabled, if the transport has not already generated
1728 * PI using hardware WRITE_INSERT offload.
1730 switch (cmd
->prot_op
) {
1731 case TARGET_PROT_DOUT_INSERT
:
1732 if (!(cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DOUT_INSERT
))
1733 sbc_dif_generate(cmd
);
1735 case TARGET_PROT_DOUT_STRIP
:
1736 if (cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DOUT_STRIP
)
1739 sectors
= cmd
->data_length
>> ilog2(cmd
->se_dev
->dev_attrib
.block_size
);
1740 cmd
->pi_err
= sbc_dif_verify(cmd
, cmd
->t_task_lba
,
1741 sectors
, 0, cmd
->t_prot_sg
, 0);
1742 if (unlikely(cmd
->pi_err
)) {
1743 spin_lock_irq(&cmd
->t_state_lock
);
1744 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1745 spin_unlock_irq(&cmd
->t_state_lock
);
1746 transport_generic_request_failure(cmd
, cmd
->pi_err
);
1757 static bool target_handle_task_attr(struct se_cmd
*cmd
)
1759 struct se_device
*dev
= cmd
->se_dev
;
1761 if (dev
->transport
->transport_flags
& TRANSPORT_FLAG_PASSTHROUGH
)
1765 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1766 * to allow the passed struct se_cmd list of tasks to the front of the list.
1768 switch (cmd
->sam_task_attr
) {
1770 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1771 "se_ordered_id: %u\n",
1772 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1774 case TCM_ORDERED_TAG
:
1775 atomic_inc_mb(&dev
->dev_ordered_sync
);
1777 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1778 " se_ordered_id: %u\n",
1779 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1782 * Execute an ORDERED command if no other older commands
1783 * exist that need to be completed first.
1785 if (!atomic_read(&dev
->simple_cmds
))
1790 * For SIMPLE and UNTAGGED Task Attribute commands
1792 atomic_inc_mb(&dev
->simple_cmds
);
1796 if (atomic_read(&dev
->dev_ordered_sync
) == 0)
1799 spin_lock(&dev
->delayed_cmd_lock
);
1800 list_add_tail(&cmd
->se_delayed_node
, &dev
->delayed_cmd_list
);
1801 spin_unlock(&dev
->delayed_cmd_lock
);
1803 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1804 " delayed CMD list, se_ordered_id: %u\n",
1805 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1806 cmd
->se_ordered_id
);
1810 void target_execute_cmd(struct se_cmd
*cmd
)
1813 * If the received CDB has aleady been aborted stop processing it here.
1815 if (transport_check_aborted_status(cmd
, 1))
1819 * Determine if frontend context caller is requesting the stopping of
1820 * this command for frontend exceptions.
1822 spin_lock_irq(&cmd
->t_state_lock
);
1823 if (cmd
->transport_state
& CMD_T_STOP
) {
1824 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1825 __func__
, __LINE__
, cmd
->tag
);
1827 spin_unlock_irq(&cmd
->t_state_lock
);
1828 complete_all(&cmd
->t_transport_stop_comp
);
1832 cmd
->t_state
= TRANSPORT_PROCESSING
;
1833 cmd
->transport_state
|= CMD_T_ACTIVE
|CMD_T_BUSY
|CMD_T_SENT
;
1834 spin_unlock_irq(&cmd
->t_state_lock
);
1836 if (target_write_prot_action(cmd
))
1839 if (target_handle_task_attr(cmd
)) {
1840 spin_lock_irq(&cmd
->t_state_lock
);
1841 cmd
->transport_state
&= ~(CMD_T_BUSY
| CMD_T_SENT
);
1842 spin_unlock_irq(&cmd
->t_state_lock
);
1846 __target_execute_cmd(cmd
);
1848 EXPORT_SYMBOL(target_execute_cmd
);
1851 * Process all commands up to the last received ORDERED task attribute which
1852 * requires another blocking boundary
1854 static void target_restart_delayed_cmds(struct se_device
*dev
)
1859 spin_lock(&dev
->delayed_cmd_lock
);
1860 if (list_empty(&dev
->delayed_cmd_list
)) {
1861 spin_unlock(&dev
->delayed_cmd_lock
);
1865 cmd
= list_entry(dev
->delayed_cmd_list
.next
,
1866 struct se_cmd
, se_delayed_node
);
1867 list_del(&cmd
->se_delayed_node
);
1868 spin_unlock(&dev
->delayed_cmd_lock
);
1870 __target_execute_cmd(cmd
);
1872 if (cmd
->sam_task_attr
== TCM_ORDERED_TAG
)
1878 * Called from I/O completion to determine which dormant/delayed
1879 * and ordered cmds need to have their tasks added to the execution queue.
1881 static void transport_complete_task_attr(struct se_cmd
*cmd
)
1883 struct se_device
*dev
= cmd
->se_dev
;
1885 if (dev
->transport
->transport_flags
& TRANSPORT_FLAG_PASSTHROUGH
)
1888 if (cmd
->sam_task_attr
== TCM_SIMPLE_TAG
) {
1889 atomic_dec_mb(&dev
->simple_cmds
);
1890 dev
->dev_cur_ordered_id
++;
1891 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1892 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
1893 cmd
->se_ordered_id
);
1894 } else if (cmd
->sam_task_attr
== TCM_HEAD_TAG
) {
1895 dev
->dev_cur_ordered_id
++;
1896 pr_debug("Incremented dev_cur_ordered_id: %u for"
1897 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
1898 cmd
->se_ordered_id
);
1899 } else if (cmd
->sam_task_attr
== TCM_ORDERED_TAG
) {
1900 atomic_dec_mb(&dev
->dev_ordered_sync
);
1902 dev
->dev_cur_ordered_id
++;
1903 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1904 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
1907 target_restart_delayed_cmds(dev
);
1910 static void transport_complete_qf(struct se_cmd
*cmd
)
1914 transport_complete_task_attr(cmd
);
1916 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1917 trace_target_cmd_complete(cmd
);
1918 ret
= cmd
->se_tfo
->queue_status(cmd
);
1922 switch (cmd
->data_direction
) {
1923 case DMA_FROM_DEVICE
:
1924 trace_target_cmd_complete(cmd
);
1925 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1928 if (cmd
->se_cmd_flags
& SCF_BIDI
) {
1929 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1932 /* Fall through for DMA_TO_DEVICE */
1934 trace_target_cmd_complete(cmd
);
1935 ret
= cmd
->se_tfo
->queue_status(cmd
);
1943 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1946 transport_lun_remove_cmd(cmd
);
1947 transport_cmd_check_stop_to_fabric(cmd
);
1950 static void transport_handle_queue_full(
1952 struct se_device
*dev
)
1954 spin_lock_irq(&dev
->qf_cmd_lock
);
1955 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
1956 atomic_inc_mb(&dev
->dev_qf_count
);
1957 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
1959 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1962 static bool target_read_prot_action(struct se_cmd
*cmd
)
1964 switch (cmd
->prot_op
) {
1965 case TARGET_PROT_DIN_STRIP
:
1966 if (!(cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DIN_STRIP
)) {
1967 u32 sectors
= cmd
->data_length
>>
1968 ilog2(cmd
->se_dev
->dev_attrib
.block_size
);
1970 cmd
->pi_err
= sbc_dif_verify(cmd
, cmd
->t_task_lba
,
1971 sectors
, 0, cmd
->t_prot_sg
,
1977 case TARGET_PROT_DIN_INSERT
:
1978 if (cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DIN_INSERT
)
1981 sbc_dif_generate(cmd
);
1990 static void target_complete_ok_work(struct work_struct
*work
)
1992 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
1996 * Check if we need to move delayed/dormant tasks from cmds on the
1997 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2000 transport_complete_task_attr(cmd
);
2003 * Check to schedule QUEUE_FULL work, or execute an existing
2004 * cmd->transport_qf_callback()
2006 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
2007 schedule_work(&cmd
->se_dev
->qf_work_queue
);
2010 * Check if we need to send a sense buffer from
2011 * the struct se_cmd in question.
2013 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
2014 WARN_ON(!cmd
->scsi_status
);
2015 ret
= transport_send_check_condition_and_sense(
2017 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2020 transport_lun_remove_cmd(cmd
);
2021 transport_cmd_check_stop_to_fabric(cmd
);
2025 * Check for a callback, used by amongst other things
2026 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
2028 if (cmd
->transport_complete_callback
) {
2031 rc
= cmd
->transport_complete_callback(cmd
, true);
2032 if (!rc
&& !(cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE_POST
)) {
2033 if ((cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
) &&
2039 ret
= transport_send_check_condition_and_sense(cmd
,
2041 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2044 transport_lun_remove_cmd(cmd
);
2045 transport_cmd_check_stop_to_fabric(cmd
);
2051 switch (cmd
->data_direction
) {
2052 case DMA_FROM_DEVICE
:
2053 atomic_long_add(cmd
->data_length
,
2054 &cmd
->se_lun
->lun_stats
.tx_data_octets
);
2056 * Perform READ_STRIP of PI using software emulation when
2057 * backend had PI enabled, if the transport will not be
2058 * performing hardware READ_STRIP offload.
2060 if (target_read_prot_action(cmd
)) {
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
);
2071 trace_target_cmd_complete(cmd
);
2072 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2073 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2077 atomic_long_add(cmd
->data_length
,
2078 &cmd
->se_lun
->lun_stats
.rx_data_octets
);
2080 * Check if we need to send READ payload for BIDI-COMMAND
2082 if (cmd
->se_cmd_flags
& SCF_BIDI
) {
2083 atomic_long_add(cmd
->data_length
,
2084 &cmd
->se_lun
->lun_stats
.tx_data_octets
);
2085 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2086 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2090 /* Fall through for DMA_TO_DEVICE */
2092 trace_target_cmd_complete(cmd
);
2093 ret
= cmd
->se_tfo
->queue_status(cmd
);
2094 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2101 transport_lun_remove_cmd(cmd
);
2102 transport_cmd_check_stop_to_fabric(cmd
);
2106 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2107 " data_direction: %d\n", cmd
, cmd
->data_direction
);
2108 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
2109 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2112 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
2114 struct scatterlist
*sg
;
2117 for_each_sg(sgl
, sg
, nents
, count
)
2118 __free_page(sg_page(sg
));
2123 static inline void transport_reset_sgl_orig(struct se_cmd
*cmd
)
2126 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2127 * emulation, and free + reset pointers if necessary..
2129 if (!cmd
->t_data_sg_orig
)
2132 kfree(cmd
->t_data_sg
);
2133 cmd
->t_data_sg
= cmd
->t_data_sg_orig
;
2134 cmd
->t_data_sg_orig
= NULL
;
2135 cmd
->t_data_nents
= cmd
->t_data_nents_orig
;
2136 cmd
->t_data_nents_orig
= 0;
2139 static inline void transport_free_pages(struct se_cmd
*cmd
)
2141 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC
)) {
2142 transport_free_sgl(cmd
->t_prot_sg
, cmd
->t_prot_nents
);
2143 cmd
->t_prot_sg
= NULL
;
2144 cmd
->t_prot_nents
= 0;
2147 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) {
2149 * Release special case READ buffer payload required for
2150 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2152 if (cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
) {
2153 transport_free_sgl(cmd
->t_bidi_data_sg
,
2154 cmd
->t_bidi_data_nents
);
2155 cmd
->t_bidi_data_sg
= NULL
;
2156 cmd
->t_bidi_data_nents
= 0;
2158 transport_reset_sgl_orig(cmd
);
2161 transport_reset_sgl_orig(cmd
);
2163 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
2164 cmd
->t_data_sg
= NULL
;
2165 cmd
->t_data_nents
= 0;
2167 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
2168 cmd
->t_bidi_data_sg
= NULL
;
2169 cmd
->t_bidi_data_nents
= 0;
2173 * transport_release_cmd - free a command
2174 * @cmd: command to free
2176 * This routine unconditionally frees a command, and reference counting
2177 * or list removal must be done in the caller.
2179 static int transport_release_cmd(struct se_cmd
*cmd
)
2181 BUG_ON(!cmd
->se_tfo
);
2183 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
2184 core_tmr_release_req(cmd
->se_tmr_req
);
2185 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
2186 kfree(cmd
->t_task_cdb
);
2188 * If this cmd has been setup with target_get_sess_cmd(), drop
2189 * the kref and call ->release_cmd() in kref callback.
2191 return target_put_sess_cmd(cmd
);
2195 * transport_put_cmd - release a reference to a command
2196 * @cmd: command to release
2198 * This routine releases our reference to the command and frees it if possible.
2200 static int transport_put_cmd(struct se_cmd
*cmd
)
2202 transport_free_pages(cmd
);
2203 return transport_release_cmd(cmd
);
2206 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
2208 struct scatterlist
*sg
= cmd
->t_data_sg
;
2209 struct page
**pages
;
2213 * We need to take into account a possible offset here for fabrics like
2214 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2215 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2217 if (!cmd
->t_data_nents
)
2221 if (cmd
->t_data_nents
== 1)
2222 return kmap(sg_page(sg
)) + sg
->offset
;
2224 /* >1 page. use vmap */
2225 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
2229 /* convert sg[] to pages[] */
2230 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
2231 pages
[i
] = sg_page(sg
);
2234 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
2236 if (!cmd
->t_data_vmap
)
2239 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
2241 EXPORT_SYMBOL(transport_kmap_data_sg
);
2243 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
2245 if (!cmd
->t_data_nents
) {
2247 } else if (cmd
->t_data_nents
== 1) {
2248 kunmap(sg_page(cmd
->t_data_sg
));
2252 vunmap(cmd
->t_data_vmap
);
2253 cmd
->t_data_vmap
= NULL
;
2255 EXPORT_SYMBOL(transport_kunmap_data_sg
);
2258 target_alloc_sgl(struct scatterlist
**sgl
, unsigned int *nents
, u32 length
,
2261 struct scatterlist
*sg
;
2263 gfp_t zero_flag
= (zero_page
) ? __GFP_ZERO
: 0;
2267 nent
= DIV_ROUND_UP(length
, PAGE_SIZE
);
2268 sg
= kmalloc(sizeof(struct scatterlist
) * nent
, GFP_KERNEL
);
2272 sg_init_table(sg
, nent
);
2275 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
2276 page
= alloc_page(GFP_KERNEL
| zero_flag
);
2280 sg_set_page(&sg
[i
], page
, page_len
, 0);
2291 __free_page(sg_page(&sg
[i
]));
2298 * Allocate any required resources to execute the command. For writes we
2299 * might not have the payload yet, so notify the fabric via a call to
2300 * ->write_pending instead. Otherwise place it on the execution queue.
2303 transport_generic_new_cmd(struct se_cmd
*cmd
)
2306 bool zero_flag
= !(cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
);
2308 if (cmd
->prot_op
!= TARGET_PROT_NORMAL
&&
2309 !(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC
)) {
2310 ret
= target_alloc_sgl(&cmd
->t_prot_sg
, &cmd
->t_prot_nents
,
2311 cmd
->prot_length
, true);
2313 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2317 * Determine is the TCM fabric module has already allocated physical
2318 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2321 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
2324 if ((cmd
->se_cmd_flags
& SCF_BIDI
) ||
2325 (cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
)) {
2328 if (cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
)
2329 bidi_length
= cmd
->t_task_nolb
*
2330 cmd
->se_dev
->dev_attrib
.block_size
;
2332 bidi_length
= cmd
->data_length
;
2334 ret
= target_alloc_sgl(&cmd
->t_bidi_data_sg
,
2335 &cmd
->t_bidi_data_nents
,
2336 bidi_length
, zero_flag
);
2338 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2341 ret
= target_alloc_sgl(&cmd
->t_data_sg
, &cmd
->t_data_nents
,
2342 cmd
->data_length
, zero_flag
);
2344 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2345 } else if ((cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
) &&
2348 * Special case for COMPARE_AND_WRITE with fabrics
2349 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2351 u32 caw_length
= cmd
->t_task_nolb
*
2352 cmd
->se_dev
->dev_attrib
.block_size
;
2354 ret
= target_alloc_sgl(&cmd
->t_bidi_data_sg
,
2355 &cmd
->t_bidi_data_nents
,
2356 caw_length
, zero_flag
);
2358 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2361 * If this command is not a write we can execute it right here,
2362 * for write buffers we need to notify the fabric driver first
2363 * and let it call back once the write buffers are ready.
2365 target_add_to_state_list(cmd
);
2366 if (cmd
->data_direction
!= DMA_TO_DEVICE
|| cmd
->data_length
== 0) {
2367 target_execute_cmd(cmd
);
2370 transport_cmd_check_stop(cmd
, false, true);
2372 ret
= cmd
->se_tfo
->write_pending(cmd
);
2373 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2376 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2379 return (!ret
) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2382 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
2383 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
2384 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2387 EXPORT_SYMBOL(transport_generic_new_cmd
);
2389 static void transport_write_pending_qf(struct se_cmd
*cmd
)
2393 ret
= cmd
->se_tfo
->write_pending(cmd
);
2394 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
2395 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2397 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2401 int transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
2403 unsigned long flags
;
2406 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
2407 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
2408 transport_wait_for_tasks(cmd
);
2410 ret
= transport_release_cmd(cmd
);
2413 transport_wait_for_tasks(cmd
);
2415 * Handle WRITE failure case where transport_generic_new_cmd()
2416 * has already added se_cmd to state_list, but fabric has
2417 * failed command before I/O submission.
2419 if (cmd
->state_active
) {
2420 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2421 target_remove_from_state_list(cmd
);
2422 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2426 transport_lun_remove_cmd(cmd
);
2428 ret
= transport_put_cmd(cmd
);
2432 EXPORT_SYMBOL(transport_generic_free_cmd
);
2434 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2435 * @se_cmd: command descriptor to add
2436 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2438 int target_get_sess_cmd(struct se_cmd
*se_cmd
, bool ack_kref
)
2440 struct se_session
*se_sess
= se_cmd
->se_sess
;
2441 unsigned long flags
;
2445 * Add a second kref if the fabric caller is expecting to handle
2446 * fabric acknowledgement that requires two target_put_sess_cmd()
2447 * invocations before se_cmd descriptor release.
2450 kref_get(&se_cmd
->cmd_kref
);
2452 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2453 if (se_sess
->sess_tearing_down
) {
2457 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
2459 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2461 if (ret
&& ack_kref
)
2462 target_put_sess_cmd(se_cmd
);
2466 EXPORT_SYMBOL(target_get_sess_cmd
);
2468 static void target_release_cmd_kref(struct kref
*kref
)
2469 __releases(&se_cmd
->se_sess
->sess_cmd_lock
)
2471 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
2472 struct se_session
*se_sess
= se_cmd
->se_sess
;
2474 if (list_empty(&se_cmd
->se_cmd_list
)) {
2475 spin_unlock(&se_sess
->sess_cmd_lock
);
2476 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2479 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
2480 spin_unlock(&se_sess
->sess_cmd_lock
);
2481 complete(&se_cmd
->cmd_wait_comp
);
2484 list_del(&se_cmd
->se_cmd_list
);
2485 spin_unlock(&se_sess
->sess_cmd_lock
);
2487 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2490 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2491 * @se_cmd: command descriptor to drop
2493 int target_put_sess_cmd(struct se_cmd
*se_cmd
)
2495 struct se_session
*se_sess
= se_cmd
->se_sess
;
2498 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2501 return kref_put_spinlock_irqsave(&se_cmd
->cmd_kref
, target_release_cmd_kref
,
2502 &se_sess
->sess_cmd_lock
);
2504 EXPORT_SYMBOL(target_put_sess_cmd
);
2506 /* target_sess_cmd_list_set_waiting - Flag all commands in
2507 * sess_cmd_list to complete cmd_wait_comp. Set
2508 * sess_tearing_down so no more commands are queued.
2509 * @se_sess: session to flag
2511 void target_sess_cmd_list_set_waiting(struct se_session
*se_sess
)
2513 struct se_cmd
*se_cmd
;
2514 unsigned long flags
;
2516 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2517 if (se_sess
->sess_tearing_down
) {
2518 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2521 se_sess
->sess_tearing_down
= 1;
2522 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
2524 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
2525 se_cmd
->cmd_wait_set
= 1;
2527 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2529 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting
);
2531 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2532 * @se_sess: session to wait for active I/O
2534 void target_wait_for_sess_cmds(struct se_session
*se_sess
)
2536 struct se_cmd
*se_cmd
, *tmp_cmd
;
2537 unsigned long flags
;
2539 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
2540 &se_sess
->sess_wait_list
, se_cmd_list
) {
2541 list_del(&se_cmd
->se_cmd_list
);
2543 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2544 " %d\n", se_cmd
, se_cmd
->t_state
,
2545 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2547 wait_for_completion(&se_cmd
->cmd_wait_comp
);
2548 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2549 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2550 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2552 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2555 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2556 WARN_ON(!list_empty(&se_sess
->sess_cmd_list
));
2557 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2560 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
2562 void transport_clear_lun_ref(struct se_lun
*lun
)
2564 percpu_ref_kill(&lun
->lun_ref
);
2565 wait_for_completion(&lun
->lun_ref_comp
);
2569 * transport_wait_for_tasks - wait for completion to occur
2570 * @cmd: command to wait
2572 * Called from frontend fabric context to wait for storage engine
2573 * to pause and/or release frontend generated struct se_cmd.
2575 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
2577 unsigned long flags
;
2579 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2580 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
2581 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2582 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2586 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
2587 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2588 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2592 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
2593 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2597 cmd
->transport_state
|= CMD_T_STOP
;
2599 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n",
2600 cmd
, cmd
->tag
, cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2602 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2604 wait_for_completion(&cmd
->t_transport_stop_comp
);
2606 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2607 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
2609 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n",
2612 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2616 EXPORT_SYMBOL(transport_wait_for_tasks
);
2618 static int transport_get_sense_codes(
2623 *asc
= cmd
->scsi_asc
;
2624 *ascq
= cmd
->scsi_ascq
;
2630 void transport_err_sector_info(unsigned char *buffer
, sector_t bad_sector
)
2632 /* Place failed LBA in sense data information descriptor 0. */
2633 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 0xc;
2634 buffer
[SPC_DESC_TYPE_OFFSET
] = 0; /* Information */
2635 buffer
[SPC_ADDITIONAL_DESC_LEN_OFFSET
] = 0xa;
2636 buffer
[SPC_VALIDITY_OFFSET
] = 0x80;
2638 /* Descriptor Information: failing sector */
2639 put_unaligned_be64(bad_sector
, &buffer
[12]);
2643 transport_send_check_condition_and_sense(struct se_cmd
*cmd
,
2644 sense_reason_t reason
, int from_transport
)
2646 unsigned char *buffer
= cmd
->sense_buffer
;
2647 unsigned long flags
;
2648 u8 asc
= 0, ascq
= 0;
2650 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2651 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2652 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2655 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
2656 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2658 if (!reason
&& from_transport
)
2661 if (!from_transport
)
2662 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
2665 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2666 * SENSE KEY values from include/scsi/scsi.h
2672 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2674 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2675 /* NO ADDITIONAL SENSE INFORMATION */
2676 buffer
[SPC_ASC_KEY_OFFSET
] = 0;
2677 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0;
2679 case TCM_NON_EXISTENT_LUN
:
2682 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2683 /* ILLEGAL REQUEST */
2684 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2685 /* LOGICAL UNIT NOT SUPPORTED */
2686 buffer
[SPC_ASC_KEY_OFFSET
] = 0x25;
2688 case TCM_UNSUPPORTED_SCSI_OPCODE
:
2689 case TCM_SECTOR_COUNT_TOO_MANY
:
2692 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2693 /* ILLEGAL REQUEST */
2694 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2695 /* INVALID COMMAND OPERATION CODE */
2696 buffer
[SPC_ASC_KEY_OFFSET
] = 0x20;
2698 case TCM_UNKNOWN_MODE_PAGE
:
2701 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2702 /* ILLEGAL REQUEST */
2703 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2704 /* INVALID FIELD IN CDB */
2705 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2707 case TCM_CHECK_CONDITION_ABORT_CMD
:
2710 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2711 /* ABORTED COMMAND */
2712 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2713 /* BUS DEVICE RESET FUNCTION OCCURRED */
2714 buffer
[SPC_ASC_KEY_OFFSET
] = 0x29;
2715 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2717 case TCM_INCORRECT_AMOUNT_OF_DATA
:
2720 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2721 /* ABORTED COMMAND */
2722 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2724 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2725 /* NOT ENOUGH UNSOLICITED DATA */
2726 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0d;
2728 case TCM_INVALID_CDB_FIELD
:
2731 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2732 /* ILLEGAL REQUEST */
2733 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2734 /* INVALID FIELD IN CDB */
2735 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2737 case TCM_INVALID_PARAMETER_LIST
:
2740 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2741 /* ILLEGAL REQUEST */
2742 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2743 /* INVALID FIELD IN PARAMETER LIST */
2744 buffer
[SPC_ASC_KEY_OFFSET
] = 0x26;
2746 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
2749 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2750 /* ILLEGAL REQUEST */
2751 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2752 /* PARAMETER LIST LENGTH ERROR */
2753 buffer
[SPC_ASC_KEY_OFFSET
] = 0x1a;
2755 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
2758 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2759 /* ABORTED COMMAND */
2760 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2762 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2763 /* UNEXPECTED_UNSOLICITED_DATA */
2764 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0c;
2766 case TCM_SERVICE_CRC_ERROR
:
2769 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2770 /* ABORTED COMMAND */
2771 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2772 /* PROTOCOL SERVICE CRC ERROR */
2773 buffer
[SPC_ASC_KEY_OFFSET
] = 0x47;
2775 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x05;
2777 case TCM_SNACK_REJECTED
:
2780 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2781 /* ABORTED COMMAND */
2782 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2784 buffer
[SPC_ASC_KEY_OFFSET
] = 0x11;
2785 /* FAILED RETRANSMISSION REQUEST */
2786 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x13;
2788 case TCM_WRITE_PROTECTED
:
2791 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2793 buffer
[SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
2794 /* WRITE PROTECTED */
2795 buffer
[SPC_ASC_KEY_OFFSET
] = 0x27;
2797 case TCM_ADDRESS_OUT_OF_RANGE
:
2800 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2801 /* ILLEGAL REQUEST */
2802 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2803 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2804 buffer
[SPC_ASC_KEY_OFFSET
] = 0x21;
2806 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
2809 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2810 /* UNIT ATTENTION */
2811 buffer
[SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
2812 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
2813 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2814 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2816 case TCM_CHECK_CONDITION_NOT_READY
:
2819 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2821 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2822 transport_get_sense_codes(cmd
, &asc
, &ascq
);
2823 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2824 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2826 case TCM_MISCOMPARE_VERIFY
:
2829 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2830 buffer
[SPC_SENSE_KEY_OFFSET
] = MISCOMPARE
;
2831 /* MISCOMPARE DURING VERIFY OPERATION */
2832 buffer
[SPC_ASC_KEY_OFFSET
] = 0x1d;
2833 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x00;
2835 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED
:
2838 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2839 /* ILLEGAL REQUEST */
2840 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2841 /* LOGICAL BLOCK GUARD CHECK FAILED */
2842 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2843 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x01;
2844 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2846 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED
:
2849 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2850 /* ILLEGAL REQUEST */
2851 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2852 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2853 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2854 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x02;
2855 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2857 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED
:
2860 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2861 /* ILLEGAL REQUEST */
2862 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2863 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2864 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2865 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2866 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2868 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
2872 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2874 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2875 * Solaris initiators. Returning NOT READY instead means the
2876 * operations will be retried a finite number of times and we
2877 * can survive intermittent errors.
2879 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2880 /* LOGICAL UNIT COMMUNICATION FAILURE */
2881 buffer
[SPC_ASC_KEY_OFFSET
] = 0x08;
2885 * This code uses linux/include/scsi/scsi.h SAM status codes!
2887 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
2889 * Automatically padded, this value is encoded in the fabric's
2890 * data_length response PDU containing the SCSI defined sense data.
2892 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
2895 trace_target_cmd_complete(cmd
);
2896 return cmd
->se_tfo
->queue_status(cmd
);
2898 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
2900 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
2902 if (!(cmd
->transport_state
& CMD_T_ABORTED
))
2906 * If cmd has been aborted but either no status is to be sent or it has
2907 * already been sent, just return
2909 if (!send_status
|| !(cmd
->se_cmd_flags
& SCF_SEND_DELAYED_TAS
))
2912 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n",
2913 cmd
->t_task_cdb
[0], cmd
->tag
);
2915 cmd
->se_cmd_flags
&= ~SCF_SEND_DELAYED_TAS
;
2916 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
2917 trace_target_cmd_complete(cmd
);
2918 cmd
->se_tfo
->queue_status(cmd
);
2922 EXPORT_SYMBOL(transport_check_aborted_status
);
2924 void transport_send_task_abort(struct se_cmd
*cmd
)
2926 unsigned long flags
;
2928 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2929 if (cmd
->se_cmd_flags
& (SCF_SENT_CHECK_CONDITION
)) {
2930 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2933 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2936 * If there are still expected incoming fabric WRITEs, we wait
2937 * until until they have completed before sending a TASK_ABORTED
2938 * response. This response with TASK_ABORTED status will be
2939 * queued back to fabric module by transport_check_aborted_status().
2941 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
2942 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
2943 cmd
->transport_state
|= CMD_T_ABORTED
;
2944 cmd
->se_cmd_flags
|= SCF_SEND_DELAYED_TAS
;
2948 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
2950 transport_lun_remove_cmd(cmd
);
2952 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
2953 cmd
->t_task_cdb
[0], cmd
->tag
);
2955 trace_target_cmd_complete(cmd
);
2956 cmd
->se_tfo
->queue_status(cmd
);
2959 static void target_tmr_work(struct work_struct
*work
)
2961 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
2962 struct se_device
*dev
= cmd
->se_dev
;
2963 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
2966 switch (tmr
->function
) {
2967 case TMR_ABORT_TASK
:
2968 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
2970 case TMR_ABORT_TASK_SET
:
2972 case TMR_CLEAR_TASK_SET
:
2973 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
2976 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
2977 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
2978 TMR_FUNCTION_REJECTED
;
2979 if (tmr
->response
== TMR_FUNCTION_COMPLETE
) {
2980 target_ua_allocate_lun(cmd
->se_sess
->se_node_acl
,
2981 cmd
->orig_fe_lun
, 0x29,
2982 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED
);
2985 case TMR_TARGET_WARM_RESET
:
2986 tmr
->response
= TMR_FUNCTION_REJECTED
;
2988 case TMR_TARGET_COLD_RESET
:
2989 tmr
->response
= TMR_FUNCTION_REJECTED
;
2992 pr_err("Uknown TMR function: 0x%02x.\n",
2994 tmr
->response
= TMR_FUNCTION_REJECTED
;
2998 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
2999 cmd
->se_tfo
->queue_tm_rsp(cmd
);
3001 transport_cmd_check_stop_to_fabric(cmd
);
3004 int transport_generic_handle_tmr(
3007 unsigned long flags
;
3009 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3010 cmd
->transport_state
|= CMD_T_ACTIVE
;
3011 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3013 INIT_WORK(&cmd
->work
, target_tmr_work
);
3014 queue_work(cmd
->se_dev
->tmr_wq
, &cmd
->work
);
3017 EXPORT_SYMBOL(transport_generic_handle_tmr
);
3020 target_check_wce(struct se_device
*dev
)
3024 if (dev
->transport
->get_write_cache
)
3025 wce
= dev
->transport
->get_write_cache(dev
);
3026 else if (dev
->dev_attrib
.emulate_write_cache
> 0)
3033 target_check_fua(struct se_device
*dev
)
3035 return target_check_wce(dev
) && dev
->dev_attrib
.emulate_fua_write
> 0;