1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * (c) Copyright 2002-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/net.h>
27 #include <linux/delay.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/slab.h>
31 #include <linux/spinlock.h>
32 #include <linux/kthread.h>
34 #include <linux/cdrom.h>
35 #include <linux/module.h>
36 #include <linux/ratelimit.h>
37 #include <asm/unaligned.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_tcq.h>
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
47 #include <target/target_core_configfs.h>
49 #include "target_core_internal.h"
50 #include "target_core_alua.h"
51 #include "target_core_pr.h"
52 #include "target_core_ua.h"
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/target.h>
57 static struct workqueue_struct
*target_completion_wq
;
58 static struct kmem_cache
*se_sess_cache
;
59 struct kmem_cache
*se_ua_cache
;
60 struct kmem_cache
*t10_pr_reg_cache
;
61 struct kmem_cache
*t10_alua_lu_gp_cache
;
62 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
63 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
64 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
65 struct kmem_cache
*t10_alua_lba_map_cache
;
66 struct kmem_cache
*t10_alua_lba_map_mem_cache
;
68 static void transport_complete_task_attr(struct se_cmd
*cmd
);
69 static void transport_handle_queue_full(struct se_cmd
*cmd
,
70 struct se_device
*dev
);
71 static int transport_put_cmd(struct se_cmd
*cmd
);
72 static void target_complete_ok_work(struct work_struct
*work
);
74 int init_se_kmem_caches(void)
76 se_sess_cache
= kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session
), __alignof__(struct se_session
),
80 pr_err("kmem_cache_create() for struct se_session"
84 se_ua_cache
= kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua
), __alignof__(struct se_ua
),
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
89 goto out_free_sess_cache
;
91 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration
),
93 __alignof__(struct t10_pr_registration
), 0, NULL
);
94 if (!t10_pr_reg_cache
) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
97 goto out_free_ua_cache
;
99 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
102 if (!t10_alua_lu_gp_cache
) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
105 goto out_free_pr_reg_cache
;
107 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member
),
109 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
110 if (!t10_alua_lu_gp_mem_cache
) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
113 goto out_free_lu_gp_cache
;
115 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp
),
117 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
118 if (!t10_alua_tg_pt_gp_cache
) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
121 goto out_free_lu_gp_mem_cache
;
123 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member
),
126 __alignof__(struct t10_alua_tg_pt_gp_member
),
128 if (!t10_alua_tg_pt_gp_mem_cache
) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
131 goto out_free_tg_pt_gp_cache
;
133 t10_alua_lba_map_cache
= kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map
),
136 __alignof__(struct t10_alua_lba_map
), 0, NULL
);
137 if (!t10_alua_lba_map_cache
) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
140 goto out_free_tg_pt_gp_mem_cache
;
142 t10_alua_lba_map_mem_cache
= kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member
),
145 __alignof__(struct t10_alua_lba_map_member
), 0, NULL
);
146 if (!t10_alua_lba_map_mem_cache
) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
149 goto out_free_lba_map_cache
;
152 target_completion_wq
= alloc_workqueue("target_completion",
154 if (!target_completion_wq
)
155 goto out_free_lba_map_mem_cache
;
159 out_free_lba_map_mem_cache
:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache
);
161 out_free_lba_map_cache
:
162 kmem_cache_destroy(t10_alua_lba_map_cache
);
163 out_free_tg_pt_gp_mem_cache
:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
165 out_free_tg_pt_gp_cache
:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
167 out_free_lu_gp_mem_cache
:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
169 out_free_lu_gp_cache
:
170 kmem_cache_destroy(t10_alua_lu_gp_cache
);
171 out_free_pr_reg_cache
:
172 kmem_cache_destroy(t10_pr_reg_cache
);
174 kmem_cache_destroy(se_ua_cache
);
176 kmem_cache_destroy(se_sess_cache
);
181 void release_se_kmem_caches(void)
183 destroy_workqueue(target_completion_wq
);
184 kmem_cache_destroy(se_sess_cache
);
185 kmem_cache_destroy(se_ua_cache
);
186 kmem_cache_destroy(t10_pr_reg_cache
);
187 kmem_cache_destroy(t10_alua_lu_gp_cache
);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
191 kmem_cache_destroy(t10_alua_lba_map_cache
);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache
);
195 /* This code ensures unique mib indexes are handed out. */
196 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
197 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
200 * Allocate a new row index for the entry type specified
202 u32
scsi_get_new_index(scsi_index_t type
)
206 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
208 spin_lock(&scsi_mib_index_lock
);
209 new_index
= ++scsi_mib_index
[type
];
210 spin_unlock(&scsi_mib_index_lock
);
215 void transport_subsystem_check_init(void)
218 static int sub_api_initialized
;
220 if (sub_api_initialized
)
223 ret
= request_module("target_core_iblock");
225 pr_err("Unable to load target_core_iblock\n");
227 ret
= request_module("target_core_file");
229 pr_err("Unable to load target_core_file\n");
231 ret
= request_module("target_core_pscsi");
233 pr_err("Unable to load target_core_pscsi\n");
235 ret
= request_module("target_core_user");
237 pr_err("Unable to load target_core_user\n");
239 sub_api_initialized
= 1;
242 struct se_session
*transport_init_session(enum target_prot_op sup_prot_ops
)
244 struct se_session
*se_sess
;
246 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
248 pr_err("Unable to allocate struct se_session from"
250 return ERR_PTR(-ENOMEM
);
252 INIT_LIST_HEAD(&se_sess
->sess_list
);
253 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
254 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
255 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
256 spin_lock_init(&se_sess
->sess_cmd_lock
);
257 kref_init(&se_sess
->sess_kref
);
258 se_sess
->sup_prot_ops
= sup_prot_ops
;
262 EXPORT_SYMBOL(transport_init_session
);
264 int transport_alloc_session_tags(struct se_session
*se_sess
,
265 unsigned int tag_num
, unsigned int tag_size
)
269 se_sess
->sess_cmd_map
= kzalloc(tag_num
* tag_size
,
270 GFP_KERNEL
| __GFP_NOWARN
| __GFP_REPEAT
);
271 if (!se_sess
->sess_cmd_map
) {
272 se_sess
->sess_cmd_map
= vzalloc(tag_num
* tag_size
);
273 if (!se_sess
->sess_cmd_map
) {
274 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
279 rc
= percpu_ida_init(&se_sess
->sess_tag_pool
, tag_num
);
281 pr_err("Unable to init se_sess->sess_tag_pool,"
282 " tag_num: %u\n", tag_num
);
283 if (is_vmalloc_addr(se_sess
->sess_cmd_map
))
284 vfree(se_sess
->sess_cmd_map
);
286 kfree(se_sess
->sess_cmd_map
);
287 se_sess
->sess_cmd_map
= NULL
;
293 EXPORT_SYMBOL(transport_alloc_session_tags
);
295 struct se_session
*transport_init_session_tags(unsigned int tag_num
,
296 unsigned int tag_size
,
297 enum target_prot_op sup_prot_ops
)
299 struct se_session
*se_sess
;
302 se_sess
= transport_init_session(sup_prot_ops
);
306 rc
= transport_alloc_session_tags(se_sess
, tag_num
, tag_size
);
308 transport_free_session(se_sess
);
309 return ERR_PTR(-ENOMEM
);
314 EXPORT_SYMBOL(transport_init_session_tags
);
317 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
319 void __transport_register_session(
320 struct se_portal_group
*se_tpg
,
321 struct se_node_acl
*se_nacl
,
322 struct se_session
*se_sess
,
323 void *fabric_sess_ptr
)
325 const struct target_core_fabric_ops
*tfo
= se_tpg
->se_tpg_tfo
;
326 unsigned char buf
[PR_REG_ISID_LEN
];
328 se_sess
->se_tpg
= se_tpg
;
329 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
331 * Determine if fabric allows for T10-PI feature bits to be exposed
332 * to initiators for device backends with !dev->dev_attrib.pi_prot_type
334 if (tfo
->tpg_check_prot_fabric_only
)
335 se_sess
->sess_prot_type
= tfo
->tpg_check_prot_fabric_only(se_tpg
);
338 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
340 * Only set for struct se_session's that will actually be moving I/O.
341 * eg: *NOT* discovery sessions.
345 * If the fabric module supports an ISID based TransportID,
346 * save this value in binary from the fabric I_T Nexus now.
348 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
349 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
350 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
351 &buf
[0], PR_REG_ISID_LEN
);
352 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
354 kref_get(&se_nacl
->acl_kref
);
356 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
358 * The se_nacl->nacl_sess pointer will be set to the
359 * last active I_T Nexus for each struct se_node_acl.
361 se_nacl
->nacl_sess
= se_sess
;
363 list_add_tail(&se_sess
->sess_acl_list
,
364 &se_nacl
->acl_sess_list
);
365 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
367 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
369 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
370 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
372 EXPORT_SYMBOL(__transport_register_session
);
374 void transport_register_session(
375 struct se_portal_group
*se_tpg
,
376 struct se_node_acl
*se_nacl
,
377 struct se_session
*se_sess
,
378 void *fabric_sess_ptr
)
382 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
383 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
384 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
386 EXPORT_SYMBOL(transport_register_session
);
388 static void target_release_session(struct kref
*kref
)
390 struct se_session
*se_sess
= container_of(kref
,
391 struct se_session
, sess_kref
);
392 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
394 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
397 void target_get_session(struct se_session
*se_sess
)
399 kref_get(&se_sess
->sess_kref
);
401 EXPORT_SYMBOL(target_get_session
);
403 void target_put_session(struct se_session
*se_sess
)
405 struct se_portal_group
*tpg
= se_sess
->se_tpg
;
407 if (tpg
->se_tpg_tfo
->put_session
!= NULL
) {
408 tpg
->se_tpg_tfo
->put_session(se_sess
);
411 kref_put(&se_sess
->sess_kref
, target_release_session
);
413 EXPORT_SYMBOL(target_put_session
);
415 ssize_t
target_show_dynamic_sessions(struct se_portal_group
*se_tpg
, char *page
)
417 struct se_session
*se_sess
;
420 spin_lock_bh(&se_tpg
->session_lock
);
421 list_for_each_entry(se_sess
, &se_tpg
->tpg_sess_list
, sess_list
) {
422 if (!se_sess
->se_node_acl
)
424 if (!se_sess
->se_node_acl
->dynamic_node_acl
)
426 if (strlen(se_sess
->se_node_acl
->initiatorname
) + 1 + len
> PAGE_SIZE
)
429 len
+= snprintf(page
+ len
, PAGE_SIZE
- len
, "%s\n",
430 se_sess
->se_node_acl
->initiatorname
);
431 len
+= 1; /* Include NULL terminator */
433 spin_unlock_bh(&se_tpg
->session_lock
);
437 EXPORT_SYMBOL(target_show_dynamic_sessions
);
439 static void target_complete_nacl(struct kref
*kref
)
441 struct se_node_acl
*nacl
= container_of(kref
,
442 struct se_node_acl
, acl_kref
);
444 complete(&nacl
->acl_free_comp
);
447 void target_put_nacl(struct se_node_acl
*nacl
)
449 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
452 void transport_deregister_session_configfs(struct se_session
*se_sess
)
454 struct se_node_acl
*se_nacl
;
457 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
459 se_nacl
= se_sess
->se_node_acl
;
461 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
462 if (se_nacl
->acl_stop
== 0)
463 list_del(&se_sess
->sess_acl_list
);
465 * If the session list is empty, then clear the pointer.
466 * Otherwise, set the struct se_session pointer from the tail
467 * element of the per struct se_node_acl active session list.
469 if (list_empty(&se_nacl
->acl_sess_list
))
470 se_nacl
->nacl_sess
= NULL
;
472 se_nacl
->nacl_sess
= container_of(
473 se_nacl
->acl_sess_list
.prev
,
474 struct se_session
, sess_acl_list
);
476 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
479 EXPORT_SYMBOL(transport_deregister_session_configfs
);
481 void transport_free_session(struct se_session
*se_sess
)
483 if (se_sess
->sess_cmd_map
) {
484 percpu_ida_destroy(&se_sess
->sess_tag_pool
);
485 if (is_vmalloc_addr(se_sess
->sess_cmd_map
))
486 vfree(se_sess
->sess_cmd_map
);
488 kfree(se_sess
->sess_cmd_map
);
490 kmem_cache_free(se_sess_cache
, se_sess
);
492 EXPORT_SYMBOL(transport_free_session
);
494 void transport_deregister_session(struct se_session
*se_sess
)
496 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
497 const struct target_core_fabric_ops
*se_tfo
;
498 struct se_node_acl
*se_nacl
;
500 bool comp_nacl
= true;
503 transport_free_session(se_sess
);
506 se_tfo
= se_tpg
->se_tpg_tfo
;
508 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
509 list_del(&se_sess
->sess_list
);
510 se_sess
->se_tpg
= NULL
;
511 se_sess
->fabric_sess_ptr
= NULL
;
512 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
515 * Determine if we need to do extra work for this initiator node's
516 * struct se_node_acl if it had been previously dynamically generated.
518 se_nacl
= se_sess
->se_node_acl
;
520 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
521 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
522 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
523 list_del(&se_nacl
->acl_list
);
524 se_tpg
->num_node_acls
--;
525 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
526 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
527 core_free_device_list_for_node(se_nacl
, se_tpg
);
528 se_tfo
->tpg_release_fabric_acl(se_tpg
, se_nacl
);
531 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
534 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
536 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
537 se_tpg
->se_tpg_tfo
->get_fabric_name());
539 * If last kref is dropping now for an explicit NodeACL, awake sleeping
540 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
543 if (se_nacl
&& comp_nacl
)
544 target_put_nacl(se_nacl
);
546 transport_free_session(se_sess
);
548 EXPORT_SYMBOL(transport_deregister_session
);
551 * Called with cmd->t_state_lock held.
553 static void target_remove_from_state_list(struct se_cmd
*cmd
)
555 struct se_device
*dev
= cmd
->se_dev
;
561 if (cmd
->transport_state
& CMD_T_BUSY
)
564 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
565 if (cmd
->state_active
) {
566 list_del(&cmd
->state_list
);
567 cmd
->state_active
= false;
569 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
572 static int transport_cmd_check_stop(struct se_cmd
*cmd
, bool remove_from_lists
,
577 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
579 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
581 if (remove_from_lists
) {
582 target_remove_from_state_list(cmd
);
585 * Clear struct se_cmd->se_lun before the handoff to FE.
591 * Determine if frontend context caller is requesting the stopping of
592 * this command for frontend exceptions.
594 if (cmd
->transport_state
& CMD_T_STOP
) {
595 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
597 cmd
->se_tfo
->get_task_tag(cmd
));
599 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
601 complete_all(&cmd
->t_transport_stop_comp
);
605 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
606 if (remove_from_lists
) {
608 * Some fabric modules like tcm_loop can release
609 * their internally allocated I/O reference now and
612 * Fabric modules are expected to return '1' here if the
613 * se_cmd being passed is released at this point,
614 * or zero if not being released.
616 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
617 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
618 return cmd
->se_tfo
->check_stop_free(cmd
);
622 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
626 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
628 return transport_cmd_check_stop(cmd
, true, false);
631 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
633 struct se_lun
*lun
= cmd
->se_lun
;
638 if (cmpxchg(&cmd
->lun_ref_active
, true, false))
639 percpu_ref_put(&lun
->lun_ref
);
642 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
644 if (cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)
645 transport_lun_remove_cmd(cmd
);
647 * Allow the fabric driver to unmap any resources before
648 * releasing the descriptor via TFO->release_cmd()
651 cmd
->se_tfo
->aborted_task(cmd
);
653 if (transport_cmd_check_stop_to_fabric(cmd
))
656 transport_put_cmd(cmd
);
659 static void target_complete_failure_work(struct work_struct
*work
)
661 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
663 transport_generic_request_failure(cmd
,
664 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
);
668 * Used when asking transport to copy Sense Data from the underlying
669 * Linux/SCSI struct scsi_cmnd
671 static unsigned char *transport_get_sense_buffer(struct se_cmd
*cmd
)
673 struct se_device
*dev
= cmd
->se_dev
;
675 WARN_ON(!cmd
->se_lun
);
680 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
)
683 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
685 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
686 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
687 return cmd
->sense_buffer
;
690 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
692 struct se_device
*dev
= cmd
->se_dev
;
693 int success
= scsi_status
== GOOD
;
696 cmd
->scsi_status
= scsi_status
;
699 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
700 cmd
->transport_state
&= ~CMD_T_BUSY
;
702 if (dev
&& dev
->transport
->transport_complete
) {
703 dev
->transport
->transport_complete(cmd
,
705 transport_get_sense_buffer(cmd
));
706 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
711 * See if we are waiting to complete for an exception condition.
713 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
714 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
715 complete(&cmd
->task_stop_comp
);
720 * Check for case where an explicit ABORT_TASK has been received
721 * and transport_wait_for_tasks() will be waiting for completion..
723 if (cmd
->transport_state
& CMD_T_ABORTED
&&
724 cmd
->transport_state
& CMD_T_STOP
) {
725 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
726 complete_all(&cmd
->t_transport_stop_comp
);
728 } else if (!success
) {
729 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
731 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
734 cmd
->t_state
= TRANSPORT_COMPLETE
;
735 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
736 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
738 queue_work(target_completion_wq
, &cmd
->work
);
740 EXPORT_SYMBOL(target_complete_cmd
);
742 void target_complete_cmd_with_length(struct se_cmd
*cmd
, u8 scsi_status
, int length
)
744 if (scsi_status
== SAM_STAT_GOOD
&& length
< cmd
->data_length
) {
745 if (cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
746 cmd
->residual_count
+= cmd
->data_length
- length
;
748 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
749 cmd
->residual_count
= cmd
->data_length
- length
;
752 cmd
->data_length
= length
;
755 target_complete_cmd(cmd
, scsi_status
);
757 EXPORT_SYMBOL(target_complete_cmd_with_length
);
759 static void target_add_to_state_list(struct se_cmd
*cmd
)
761 struct se_device
*dev
= cmd
->se_dev
;
764 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
765 if (!cmd
->state_active
) {
766 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
767 cmd
->state_active
= true;
769 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
773 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
775 static void transport_write_pending_qf(struct se_cmd
*cmd
);
776 static void transport_complete_qf(struct se_cmd
*cmd
);
778 void target_qf_do_work(struct work_struct
*work
)
780 struct se_device
*dev
= container_of(work
, struct se_device
,
782 LIST_HEAD(qf_cmd_list
);
783 struct se_cmd
*cmd
, *cmd_tmp
;
785 spin_lock_irq(&dev
->qf_cmd_lock
);
786 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
787 spin_unlock_irq(&dev
->qf_cmd_lock
);
789 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
790 list_del(&cmd
->se_qf_node
);
791 atomic_dec_mb(&dev
->dev_qf_count
);
793 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
794 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
795 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
796 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
799 if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
)
800 transport_write_pending_qf(cmd
);
801 else if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
)
802 transport_complete_qf(cmd
);
806 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
808 switch (cmd
->data_direction
) {
811 case DMA_FROM_DEVICE
:
815 case DMA_BIDIRECTIONAL
:
824 void transport_dump_dev_state(
825 struct se_device
*dev
,
829 *bl
+= sprintf(b
+ *bl
, "Status: ");
830 if (dev
->export_count
)
831 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
833 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
835 *bl
+= sprintf(b
+ *bl
, " Max Queue Depth: %d", dev
->queue_depth
);
836 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u HwMaxSectors: %u\n",
837 dev
->dev_attrib
.block_size
,
838 dev
->dev_attrib
.hw_max_sectors
);
839 *bl
+= sprintf(b
+ *bl
, " ");
842 void transport_dump_vpd_proto_id(
844 unsigned char *p_buf
,
847 unsigned char buf
[VPD_TMP_BUF_SIZE
];
850 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
851 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
853 switch (vpd
->protocol_identifier
) {
855 sprintf(buf
+len
, "Fibre Channel\n");
858 sprintf(buf
+len
, "Parallel SCSI\n");
861 sprintf(buf
+len
, "SSA\n");
864 sprintf(buf
+len
, "IEEE 1394\n");
867 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
871 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
874 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
877 sprintf(buf
+len
, "Automation/Drive Interface Transport"
881 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
884 sprintf(buf
+len
, "Unknown 0x%02x\n",
885 vpd
->protocol_identifier
);
890 strncpy(p_buf
, buf
, p_buf_len
);
896 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
899 * Check if the Protocol Identifier Valid (PIV) bit is set..
901 * from spc3r23.pdf section 7.5.1
903 if (page_83
[1] & 0x80) {
904 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
905 vpd
->protocol_identifier_set
= 1;
906 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
909 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
911 int transport_dump_vpd_assoc(
913 unsigned char *p_buf
,
916 unsigned char buf
[VPD_TMP_BUF_SIZE
];
920 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
921 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
923 switch (vpd
->association
) {
925 sprintf(buf
+len
, "addressed logical unit\n");
928 sprintf(buf
+len
, "target port\n");
931 sprintf(buf
+len
, "SCSI target device\n");
934 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
940 strncpy(p_buf
, buf
, p_buf_len
);
947 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
950 * The VPD identification association..
952 * from spc3r23.pdf Section 7.6.3.1 Table 297
954 vpd
->association
= (page_83
[1] & 0x30);
955 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
957 EXPORT_SYMBOL(transport_set_vpd_assoc
);
959 int transport_dump_vpd_ident_type(
961 unsigned char *p_buf
,
964 unsigned char buf
[VPD_TMP_BUF_SIZE
];
968 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
969 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
971 switch (vpd
->device_identifier_type
) {
973 sprintf(buf
+len
, "Vendor specific\n");
976 sprintf(buf
+len
, "T10 Vendor ID based\n");
979 sprintf(buf
+len
, "EUI-64 based\n");
982 sprintf(buf
+len
, "NAA\n");
985 sprintf(buf
+len
, "Relative target port identifier\n");
988 sprintf(buf
+len
, "SCSI name string\n");
991 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
992 vpd
->device_identifier_type
);
998 if (p_buf_len
< strlen(buf
)+1)
1000 strncpy(p_buf
, buf
, p_buf_len
);
1002 pr_debug("%s", buf
);
1008 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1011 * The VPD identifier type..
1013 * from spc3r23.pdf Section 7.6.3.1 Table 298
1015 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1016 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1018 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1020 int transport_dump_vpd_ident(
1021 struct t10_vpd
*vpd
,
1022 unsigned char *p_buf
,
1025 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1028 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1030 switch (vpd
->device_identifier_code_set
) {
1031 case 0x01: /* Binary */
1032 snprintf(buf
, sizeof(buf
),
1033 "T10 VPD Binary Device Identifier: %s\n",
1034 &vpd
->device_identifier
[0]);
1036 case 0x02: /* ASCII */
1037 snprintf(buf
, sizeof(buf
),
1038 "T10 VPD ASCII Device Identifier: %s\n",
1039 &vpd
->device_identifier
[0]);
1041 case 0x03: /* UTF-8 */
1042 snprintf(buf
, sizeof(buf
),
1043 "T10 VPD UTF-8 Device Identifier: %s\n",
1044 &vpd
->device_identifier
[0]);
1047 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1048 " 0x%02x", vpd
->device_identifier_code_set
);
1054 strncpy(p_buf
, buf
, p_buf_len
);
1056 pr_debug("%s", buf
);
1062 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1064 static const char hex_str
[] = "0123456789abcdef";
1065 int j
= 0, i
= 4; /* offset to start of the identifier */
1068 * The VPD Code Set (encoding)
1070 * from spc3r23.pdf Section 7.6.3.1 Table 296
1072 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1073 switch (vpd
->device_identifier_code_set
) {
1074 case 0x01: /* Binary */
1075 vpd
->device_identifier
[j
++] =
1076 hex_str
[vpd
->device_identifier_type
];
1077 while (i
< (4 + page_83
[3])) {
1078 vpd
->device_identifier
[j
++] =
1079 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1080 vpd
->device_identifier
[j
++] =
1081 hex_str
[page_83
[i
] & 0x0f];
1085 case 0x02: /* ASCII */
1086 case 0x03: /* UTF-8 */
1087 while (i
< (4 + page_83
[3]))
1088 vpd
->device_identifier
[j
++] = page_83
[i
++];
1094 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1096 EXPORT_SYMBOL(transport_set_vpd_ident
);
1099 target_cmd_size_check(struct se_cmd
*cmd
, unsigned int size
)
1101 struct se_device
*dev
= cmd
->se_dev
;
1103 if (cmd
->unknown_data_length
) {
1104 cmd
->data_length
= size
;
1105 } else if (size
!= cmd
->data_length
) {
1106 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1107 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1108 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
1109 cmd
->data_length
, size
, cmd
->t_task_cdb
[0]);
1111 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
1112 pr_err("Rejecting underflow/overflow"
1114 return TCM_INVALID_CDB_FIELD
;
1117 * Reject READ_* or WRITE_* with overflow/underflow for
1118 * type SCF_SCSI_DATA_CDB.
1120 if (dev
->dev_attrib
.block_size
!= 512) {
1121 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1122 " CDB on non 512-byte sector setup subsystem"
1123 " plugin: %s\n", dev
->transport
->name
);
1124 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1125 return TCM_INVALID_CDB_FIELD
;
1128 * For the overflow case keep the existing fabric provided
1129 * ->data_length. Otherwise for the underflow case, reset
1130 * ->data_length to the smaller SCSI expected data transfer
1133 if (size
> cmd
->data_length
) {
1134 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
1135 cmd
->residual_count
= (size
- cmd
->data_length
);
1137 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
1138 cmd
->residual_count
= (cmd
->data_length
- size
);
1139 cmd
->data_length
= size
;
1148 * Used by fabric modules containing a local struct se_cmd within their
1149 * fabric dependent per I/O descriptor.
1151 void transport_init_se_cmd(
1153 const struct target_core_fabric_ops
*tfo
,
1154 struct se_session
*se_sess
,
1158 unsigned char *sense_buffer
)
1160 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1161 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1162 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1163 INIT_LIST_HEAD(&cmd
->state_list
);
1164 init_completion(&cmd
->t_transport_stop_comp
);
1165 init_completion(&cmd
->cmd_wait_comp
);
1166 init_completion(&cmd
->task_stop_comp
);
1167 spin_lock_init(&cmd
->t_state_lock
);
1168 kref_init(&cmd
->cmd_kref
);
1169 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1172 cmd
->se_sess
= se_sess
;
1173 cmd
->data_length
= data_length
;
1174 cmd
->data_direction
= data_direction
;
1175 cmd
->sam_task_attr
= task_attr
;
1176 cmd
->sense_buffer
= sense_buffer
;
1178 cmd
->state_active
= false;
1180 EXPORT_SYMBOL(transport_init_se_cmd
);
1182 static sense_reason_t
1183 transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1185 struct se_device
*dev
= cmd
->se_dev
;
1188 * Check if SAM Task Attribute emulation is enabled for this
1189 * struct se_device storage object
1191 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1194 if (cmd
->sam_task_attr
== TCM_ACA_TAG
) {
1195 pr_debug("SAM Task Attribute ACA"
1196 " emulation is not supported\n");
1197 return TCM_INVALID_CDB_FIELD
;
1200 * Used to determine when ORDERED commands should go from
1201 * Dormant to Active status.
1203 cmd
->se_ordered_id
= atomic_inc_return(&dev
->dev_ordered_id
);
1204 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1205 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1206 dev
->transport
->name
);
1211 target_setup_cmd_from_cdb(struct se_cmd
*cmd
, unsigned char *cdb
)
1213 struct se_device
*dev
= cmd
->se_dev
;
1217 * Ensure that the received CDB is less than the max (252 + 8) bytes
1218 * for VARIABLE_LENGTH_CMD
1220 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1221 pr_err("Received SCSI CDB with command_size: %d that"
1222 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1223 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1224 return TCM_INVALID_CDB_FIELD
;
1227 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1228 * allocate the additional extended CDB buffer now.. Otherwise
1229 * setup the pointer from __t_task_cdb to t_task_cdb.
1231 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1232 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1234 if (!cmd
->t_task_cdb
) {
1235 pr_err("Unable to allocate cmd->t_task_cdb"
1236 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1237 scsi_command_size(cdb
),
1238 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1239 return TCM_OUT_OF_RESOURCES
;
1242 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1244 * Copy the original CDB into cmd->
1246 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1248 trace_target_sequencer_start(cmd
);
1251 * Check for an existing UNIT ATTENTION condition
1253 ret
= target_scsi3_ua_check(cmd
);
1257 ret
= target_alua_state_check(cmd
);
1261 ret
= target_check_reservation(cmd
);
1263 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1267 ret
= dev
->transport
->parse_cdb(cmd
);
1271 ret
= transport_check_alloc_task_attr(cmd
);
1275 cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1277 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1278 if (cmd
->se_lun
->lun_sep
)
1279 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1280 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1283 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1286 * Used by fabric module frontends to queue tasks directly.
1287 * Many only be used from process context only
1289 int transport_handle_cdb_direct(
1296 pr_err("cmd->se_lun is NULL\n");
1299 if (in_interrupt()) {
1301 pr_err("transport_generic_handle_cdb cannot be called"
1302 " from interrupt context\n");
1306 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1307 * outstanding descriptors are handled correctly during shutdown via
1308 * transport_wait_for_tasks()
1310 * Also, we don't take cmd->t_state_lock here as we only expect
1311 * this to be called for initial descriptor submission.
1313 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1314 cmd
->transport_state
|= CMD_T_ACTIVE
;
1317 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1318 * so follow TRANSPORT_NEW_CMD processing thread context usage
1319 * and call transport_generic_request_failure() if necessary..
1321 ret
= transport_generic_new_cmd(cmd
);
1323 transport_generic_request_failure(cmd
, ret
);
1326 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1329 transport_generic_map_mem_to_cmd(struct se_cmd
*cmd
, struct scatterlist
*sgl
,
1330 u32 sgl_count
, struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
)
1332 if (!sgl
|| !sgl_count
)
1336 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1337 * scatterlists already have been set to follow what the fabric
1338 * passes for the original expected data transfer length.
1340 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
1341 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1342 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1343 return TCM_INVALID_CDB_FIELD
;
1346 cmd
->t_data_sg
= sgl
;
1347 cmd
->t_data_nents
= sgl_count
;
1349 if (sgl_bidi
&& sgl_bidi_count
) {
1350 cmd
->t_bidi_data_sg
= sgl_bidi
;
1351 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
1353 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
1358 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1359 * se_cmd + use pre-allocated SGL memory.
1361 * @se_cmd: command descriptor to submit
1362 * @se_sess: associated se_sess for endpoint
1363 * @cdb: pointer to SCSI CDB
1364 * @sense: pointer to SCSI sense buffer
1365 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1366 * @data_length: fabric expected data transfer length
1367 * @task_addr: SAM task attribute
1368 * @data_dir: DMA data direction
1369 * @flags: flags for command submission from target_sc_flags_tables
1370 * @sgl: struct scatterlist memory for unidirectional mapping
1371 * @sgl_count: scatterlist count for unidirectional mapping
1372 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1373 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1374 * @sgl_prot: struct scatterlist memory protection information
1375 * @sgl_prot_count: scatterlist count for protection information
1377 * Returns non zero to signal active I/O shutdown failure. All other
1378 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1379 * but still return zero here.
1381 * This may only be called from process context, and also currently
1382 * assumes internal allocation of fabric payload buffer by target-core.
1384 int target_submit_cmd_map_sgls(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1385 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1386 u32 data_length
, int task_attr
, int data_dir
, int flags
,
1387 struct scatterlist
*sgl
, u32 sgl_count
,
1388 struct scatterlist
*sgl_bidi
, u32 sgl_bidi_count
,
1389 struct scatterlist
*sgl_prot
, u32 sgl_prot_count
)
1391 struct se_portal_group
*se_tpg
;
1395 se_tpg
= se_sess
->se_tpg
;
1397 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1398 BUG_ON(in_interrupt());
1400 * Initialize se_cmd for target operation. From this point
1401 * exceptions are handled by sending exception status via
1402 * target_core_fabric_ops->queue_status() callback
1404 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1405 data_length
, data_dir
, task_attr
, sense
);
1406 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1407 se_cmd
->unknown_data_length
= 1;
1409 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1410 * se_sess->sess_cmd_list. A second kref_get here is necessary
1411 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1412 * kref_put() to happen during fabric packet acknowledgement.
1414 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1418 * Signal bidirectional data payloads to target-core
1420 if (flags
& TARGET_SCF_BIDI_OP
)
1421 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1423 * Locate se_lun pointer and attach it to struct se_cmd
1425 rc
= transport_lookup_cmd_lun(se_cmd
, unpacked_lun
);
1427 transport_send_check_condition_and_sense(se_cmd
, rc
, 0);
1428 target_put_sess_cmd(se_sess
, se_cmd
);
1432 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1434 transport_generic_request_failure(se_cmd
, rc
);
1439 * Save pointers for SGLs containing protection information,
1442 if (sgl_prot_count
) {
1443 se_cmd
->t_prot_sg
= sgl_prot
;
1444 se_cmd
->t_prot_nents
= sgl_prot_count
;
1448 * When a non zero sgl_count has been passed perform SGL passthrough
1449 * mapping for pre-allocated fabric memory instead of having target
1450 * core perform an internal SGL allocation..
1452 if (sgl_count
!= 0) {
1456 * A work-around for tcm_loop as some userspace code via
1457 * scsi-generic do not memset their associated read buffers,
1458 * so go ahead and do that here for type non-data CDBs. Also
1459 * note that this is currently guaranteed to be a single SGL
1460 * for this case by target core in target_setup_cmd_from_cdb()
1461 * -> transport_generic_cmd_sequencer().
1463 if (!(se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) &&
1464 se_cmd
->data_direction
== DMA_FROM_DEVICE
) {
1465 unsigned char *buf
= NULL
;
1468 buf
= kmap(sg_page(sgl
)) + sgl
->offset
;
1471 memset(buf
, 0, sgl
->length
);
1472 kunmap(sg_page(sgl
));
1476 rc
= transport_generic_map_mem_to_cmd(se_cmd
, sgl
, sgl_count
,
1477 sgl_bidi
, sgl_bidi_count
);
1479 transport_generic_request_failure(se_cmd
, rc
);
1485 * Check if we need to delay processing because of ALUA
1486 * Active/NonOptimized primary access state..
1488 core_alua_check_nonop_delay(se_cmd
);
1490 transport_handle_cdb_direct(se_cmd
);
1493 EXPORT_SYMBOL(target_submit_cmd_map_sgls
);
1496 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1498 * @se_cmd: command descriptor to submit
1499 * @se_sess: associated se_sess for endpoint
1500 * @cdb: pointer to SCSI CDB
1501 * @sense: pointer to SCSI sense buffer
1502 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1503 * @data_length: fabric expected data transfer length
1504 * @task_addr: SAM task attribute
1505 * @data_dir: DMA data direction
1506 * @flags: flags for command submission from target_sc_flags_tables
1508 * Returns non zero to signal active I/O shutdown failure. All other
1509 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1510 * but still return zero here.
1512 * This may only be called from process context, and also currently
1513 * assumes internal allocation of fabric payload buffer by target-core.
1515 * It also assumes interal target core SGL memory allocation.
1517 int target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1518 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1519 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1521 return target_submit_cmd_map_sgls(se_cmd
, se_sess
, cdb
, sense
,
1522 unpacked_lun
, data_length
, task_attr
, data_dir
,
1523 flags
, NULL
, 0, NULL
, 0, NULL
, 0);
1525 EXPORT_SYMBOL(target_submit_cmd
);
1527 static void target_complete_tmr_failure(struct work_struct
*work
)
1529 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1531 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1532 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1534 transport_cmd_check_stop_to_fabric(se_cmd
);
1538 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1541 * @se_cmd: command descriptor to submit
1542 * @se_sess: associated se_sess for endpoint
1543 * @sense: pointer to SCSI sense buffer
1544 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1545 * @fabric_context: fabric context for TMR req
1546 * @tm_type: Type of TM request
1547 * @gfp: gfp type for caller
1548 * @tag: referenced task tag for TMR_ABORT_TASK
1549 * @flags: submit cmd flags
1551 * Callable from all contexts.
1554 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1555 unsigned char *sense
, u32 unpacked_lun
,
1556 void *fabric_tmr_ptr
, unsigned char tm_type
,
1557 gfp_t gfp
, unsigned int tag
, int flags
)
1559 struct se_portal_group
*se_tpg
;
1562 se_tpg
= se_sess
->se_tpg
;
1565 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1566 0, DMA_NONE
, TCM_SIMPLE_TAG
, sense
);
1568 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1569 * allocation failure.
1571 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1575 if (tm_type
== TMR_ABORT_TASK
)
1576 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1578 /* See target_submit_cmd for commentary */
1579 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1581 core_tmr_release_req(se_cmd
->se_tmr_req
);
1585 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1588 * For callback during failure handling, push this work off
1589 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1591 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1592 schedule_work(&se_cmd
->work
);
1595 transport_generic_handle_tmr(se_cmd
);
1598 EXPORT_SYMBOL(target_submit_tmr
);
1601 * If the cmd is active, request it to be stopped and sleep until it
1604 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1605 __releases(&cmd
->t_state_lock
)
1606 __acquires(&cmd
->t_state_lock
)
1608 bool was_active
= false;
1610 if (cmd
->transport_state
& CMD_T_BUSY
) {
1611 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1612 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1614 pr_debug("cmd %p waiting to complete\n", cmd
);
1615 wait_for_completion(&cmd
->task_stop_comp
);
1616 pr_debug("cmd %p stopped successfully\n", cmd
);
1618 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1619 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1620 cmd
->transport_state
&= ~CMD_T_BUSY
;
1628 * Handle SAM-esque emulation for generic transport request failures.
1630 void transport_generic_request_failure(struct se_cmd
*cmd
,
1631 sense_reason_t sense_reason
)
1635 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1636 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1637 cmd
->t_task_cdb
[0]);
1638 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1639 cmd
->se_tfo
->get_cmd_state(cmd
),
1640 cmd
->t_state
, sense_reason
);
1641 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1642 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1643 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1644 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1647 * For SAM Task Attribute emulation for failed struct se_cmd
1649 transport_complete_task_attr(cmd
);
1651 * Handle special case for COMPARE_AND_WRITE failure, where the
1652 * callback is expected to drop the per device ->caw_sem.
1654 if ((cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
) &&
1655 cmd
->transport_complete_callback
)
1656 cmd
->transport_complete_callback(cmd
, false);
1658 switch (sense_reason
) {
1659 case TCM_NON_EXISTENT_LUN
:
1660 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1661 case TCM_INVALID_CDB_FIELD
:
1662 case TCM_INVALID_PARAMETER_LIST
:
1663 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
1664 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1665 case TCM_UNKNOWN_MODE_PAGE
:
1666 case TCM_WRITE_PROTECTED
:
1667 case TCM_ADDRESS_OUT_OF_RANGE
:
1668 case TCM_CHECK_CONDITION_ABORT_CMD
:
1669 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1670 case TCM_CHECK_CONDITION_NOT_READY
:
1671 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED
:
1672 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED
:
1673 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED
:
1675 case TCM_OUT_OF_RESOURCES
:
1676 sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1678 case TCM_RESERVATION_CONFLICT
:
1680 * No SENSE Data payload for this case, set SCSI Status
1681 * and queue the response to $FABRIC_MOD.
1683 * Uses linux/include/scsi/scsi.h SAM status codes defs
1685 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1687 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1688 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1691 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1694 cmd
->se_dev
->dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1695 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1696 cmd
->orig_fe_lun
, 0x2C,
1697 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1699 trace_target_cmd_complete(cmd
);
1700 ret
= cmd
->se_tfo
-> queue_status(cmd
);
1701 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1705 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1706 cmd
->t_task_cdb
[0], sense_reason
);
1707 sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1711 ret
= transport_send_check_condition_and_sense(cmd
, sense_reason
, 0);
1712 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1716 transport_lun_remove_cmd(cmd
);
1717 if (!transport_cmd_check_stop_to_fabric(cmd
))
1722 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1723 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1725 EXPORT_SYMBOL(transport_generic_request_failure
);
1727 void __target_execute_cmd(struct se_cmd
*cmd
)
1731 if (cmd
->execute_cmd
) {
1732 ret
= cmd
->execute_cmd(cmd
);
1734 spin_lock_irq(&cmd
->t_state_lock
);
1735 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1736 spin_unlock_irq(&cmd
->t_state_lock
);
1738 transport_generic_request_failure(cmd
, ret
);
1743 static int target_write_prot_action(struct se_cmd
*cmd
)
1747 * Perform WRITE_INSERT of PI using software emulation when backend
1748 * device has PI enabled, if the transport has not already generated
1749 * PI using hardware WRITE_INSERT offload.
1751 switch (cmd
->prot_op
) {
1752 case TARGET_PROT_DOUT_INSERT
:
1753 if (!(cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DOUT_INSERT
))
1754 sbc_dif_generate(cmd
);
1756 case TARGET_PROT_DOUT_STRIP
:
1757 if (cmd
->se_sess
->sup_prot_ops
& TARGET_PROT_DOUT_STRIP
)
1760 sectors
= cmd
->data_length
>> ilog2(cmd
->se_dev
->dev_attrib
.block_size
);
1761 cmd
->pi_err
= sbc_dif_verify_write(cmd
, cmd
->t_task_lba
,
1762 sectors
, 0, NULL
, 0);
1763 if (unlikely(cmd
->pi_err
)) {
1764 spin_lock_irq(&cmd
->t_state_lock
);
1765 cmd
->transport_state
&= ~CMD_T_BUSY
|CMD_T_SENT
;
1766 spin_unlock_irq(&cmd
->t_state_lock
);
1767 transport_generic_request_failure(cmd
, cmd
->pi_err
);
1778 static bool target_handle_task_attr(struct se_cmd
*cmd
)
1780 struct se_device
*dev
= cmd
->se_dev
;
1782 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1786 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1787 * to allow the passed struct se_cmd list of tasks to the front of the list.
1789 switch (cmd
->sam_task_attr
) {
1791 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1792 "se_ordered_id: %u\n",
1793 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1795 case TCM_ORDERED_TAG
:
1796 atomic_inc_mb(&dev
->dev_ordered_sync
);
1798 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1799 " se_ordered_id: %u\n",
1800 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1803 * Execute an ORDERED command if no other older commands
1804 * exist that need to be completed first.
1806 if (!atomic_read(&dev
->simple_cmds
))
1811 * For SIMPLE and UNTAGGED Task Attribute commands
1813 atomic_inc_mb(&dev
->simple_cmds
);
1817 if (atomic_read(&dev
->dev_ordered_sync
) == 0)
1820 spin_lock(&dev
->delayed_cmd_lock
);
1821 list_add_tail(&cmd
->se_delayed_node
, &dev
->delayed_cmd_list
);
1822 spin_unlock(&dev
->delayed_cmd_lock
);
1824 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1825 " delayed CMD list, se_ordered_id: %u\n",
1826 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1827 cmd
->se_ordered_id
);
1831 void target_execute_cmd(struct se_cmd
*cmd
)
1834 * If the received CDB has aleady been aborted stop processing it here.
1836 if (transport_check_aborted_status(cmd
, 1))
1840 * Determine if frontend context caller is requesting the stopping of
1841 * this command for frontend exceptions.
1843 spin_lock_irq(&cmd
->t_state_lock
);
1844 if (cmd
->transport_state
& CMD_T_STOP
) {
1845 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1847 cmd
->se_tfo
->get_task_tag(cmd
));
1849 spin_unlock_irq(&cmd
->t_state_lock
);
1850 complete_all(&cmd
->t_transport_stop_comp
);
1854 cmd
->t_state
= TRANSPORT_PROCESSING
;
1855 cmd
->transport_state
|= CMD_T_ACTIVE
|CMD_T_BUSY
|CMD_T_SENT
;
1856 spin_unlock_irq(&cmd
->t_state_lock
);
1858 if (target_write_prot_action(cmd
))
1861 if (target_handle_task_attr(cmd
)) {
1862 spin_lock_irq(&cmd
->t_state_lock
);
1863 cmd
->transport_state
&= ~CMD_T_BUSY
|CMD_T_SENT
;
1864 spin_unlock_irq(&cmd
->t_state_lock
);
1868 __target_execute_cmd(cmd
);
1870 EXPORT_SYMBOL(target_execute_cmd
);
1873 * Process all commands up to the last received ORDERED task attribute which
1874 * requires another blocking boundary
1876 static void target_restart_delayed_cmds(struct se_device
*dev
)
1881 spin_lock(&dev
->delayed_cmd_lock
);
1882 if (list_empty(&dev
->delayed_cmd_list
)) {
1883 spin_unlock(&dev
->delayed_cmd_lock
);
1887 cmd
= list_entry(dev
->delayed_cmd_list
.next
,
1888 struct se_cmd
, se_delayed_node
);
1889 list_del(&cmd
->se_delayed_node
);
1890 spin_unlock(&dev
->delayed_cmd_lock
);
1892 __target_execute_cmd(cmd
);
1894 if (cmd
->sam_task_attr
== TCM_ORDERED_TAG
)
1900 * Called from I/O completion to determine which dormant/delayed
1901 * and ordered cmds need to have their tasks added to the execution queue.
1903 static void transport_complete_task_attr(struct se_cmd
*cmd
)
1905 struct se_device
*dev
= cmd
->se_dev
;
1907 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
1910 if (cmd
->sam_task_attr
== TCM_SIMPLE_TAG
) {
1911 atomic_dec_mb(&dev
->simple_cmds
);
1912 dev
->dev_cur_ordered_id
++;
1913 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1914 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
1915 cmd
->se_ordered_id
);
1916 } else if (cmd
->sam_task_attr
== TCM_HEAD_TAG
) {
1917 dev
->dev_cur_ordered_id
++;
1918 pr_debug("Incremented dev_cur_ordered_id: %u for"
1919 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
1920 cmd
->se_ordered_id
);
1921 } else if (cmd
->sam_task_attr
== TCM_ORDERED_TAG
) {
1922 atomic_dec_mb(&dev
->dev_ordered_sync
);
1924 dev
->dev_cur_ordered_id
++;
1925 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1926 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
1929 target_restart_delayed_cmds(dev
);
1932 static void transport_complete_qf(struct se_cmd
*cmd
)
1936 transport_complete_task_attr(cmd
);
1938 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1939 trace_target_cmd_complete(cmd
);
1940 ret
= cmd
->se_tfo
->queue_status(cmd
);
1944 switch (cmd
->data_direction
) {
1945 case DMA_FROM_DEVICE
:
1946 trace_target_cmd_complete(cmd
);
1947 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1950 if (cmd
->se_cmd_flags
& SCF_BIDI
) {
1951 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
);
2484 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
2487 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2488 if (se_sess
->sess_tearing_down
) {
2492 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
2494 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2497 EXPORT_SYMBOL(target_get_sess_cmd
);
2499 static void target_release_cmd_kref(struct kref
*kref
)
2500 __releases(&se_cmd
->se_sess
->sess_cmd_lock
)
2502 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
2503 struct se_session
*se_sess
= se_cmd
->se_sess
;
2505 if (list_empty(&se_cmd
->se_cmd_list
)) {
2506 spin_unlock(&se_sess
->sess_cmd_lock
);
2507 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2510 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
2511 spin_unlock(&se_sess
->sess_cmd_lock
);
2512 complete(&se_cmd
->cmd_wait_comp
);
2515 list_del(&se_cmd
->se_cmd_list
);
2516 spin_unlock(&se_sess
->sess_cmd_lock
);
2518 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2521 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2522 * @se_sess: session to reference
2523 * @se_cmd: command descriptor to drop
2525 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
2528 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2531 return kref_put_spinlock_irqsave(&se_cmd
->cmd_kref
, target_release_cmd_kref
,
2532 &se_sess
->sess_cmd_lock
);
2534 EXPORT_SYMBOL(target_put_sess_cmd
);
2536 /* target_sess_cmd_list_set_waiting - Flag all commands in
2537 * sess_cmd_list to complete cmd_wait_comp. Set
2538 * sess_tearing_down so no more commands are queued.
2539 * @se_sess: session to flag
2541 void target_sess_cmd_list_set_waiting(struct se_session
*se_sess
)
2543 struct se_cmd
*se_cmd
;
2544 unsigned long flags
;
2546 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2547 if (se_sess
->sess_tearing_down
) {
2548 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2551 se_sess
->sess_tearing_down
= 1;
2552 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
2554 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
2555 se_cmd
->cmd_wait_set
= 1;
2557 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2559 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting
);
2561 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2562 * @se_sess: session to wait for active I/O
2564 void target_wait_for_sess_cmds(struct se_session
*se_sess
)
2566 struct se_cmd
*se_cmd
, *tmp_cmd
;
2567 unsigned long flags
;
2569 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
2570 &se_sess
->sess_wait_list
, se_cmd_list
) {
2571 list_del(&se_cmd
->se_cmd_list
);
2573 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2574 " %d\n", se_cmd
, se_cmd
->t_state
,
2575 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2577 wait_for_completion(&se_cmd
->cmd_wait_comp
);
2578 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2579 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2580 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2582 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2585 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2586 WARN_ON(!list_empty(&se_sess
->sess_cmd_list
));
2587 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2590 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
2592 static int transport_clear_lun_ref_thread(void *p
)
2594 struct se_lun
*lun
= p
;
2596 percpu_ref_kill(&lun
->lun_ref
);
2598 wait_for_completion(&lun
->lun_ref_comp
);
2599 complete(&lun
->lun_shutdown_comp
);
2604 int transport_clear_lun_ref(struct se_lun
*lun
)
2606 struct task_struct
*kt
;
2608 kt
= kthread_run(transport_clear_lun_ref_thread
, lun
,
2609 "tcm_cl_%u", lun
->unpacked_lun
);
2611 pr_err("Unable to start clear_lun thread\n");
2614 wait_for_completion(&lun
->lun_shutdown_comp
);
2620 * transport_wait_for_tasks - wait for completion to occur
2621 * @cmd: command to wait
2623 * Called from frontend fabric context to wait for storage engine
2624 * to pause and/or release frontend generated struct se_cmd.
2626 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
2628 unsigned long flags
;
2630 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2631 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
2632 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2633 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2637 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
2638 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2639 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2643 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
2644 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2648 cmd
->transport_state
|= CMD_T_STOP
;
2650 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2651 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2652 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
2653 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2655 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2657 wait_for_completion(&cmd
->t_transport_stop_comp
);
2659 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2660 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
2662 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2663 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2664 cmd
->se_tfo
->get_task_tag(cmd
));
2666 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2670 EXPORT_SYMBOL(transport_wait_for_tasks
);
2672 static int transport_get_sense_codes(
2677 *asc
= cmd
->scsi_asc
;
2678 *ascq
= cmd
->scsi_ascq
;
2684 void transport_err_sector_info(unsigned char *buffer
, sector_t bad_sector
)
2686 /* Place failed LBA in sense data information descriptor 0. */
2687 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 0xc;
2688 buffer
[SPC_DESC_TYPE_OFFSET
] = 0; /* Information */
2689 buffer
[SPC_ADDITIONAL_DESC_LEN_OFFSET
] = 0xa;
2690 buffer
[SPC_VALIDITY_OFFSET
] = 0x80;
2692 /* Descriptor Information: failing sector */
2693 put_unaligned_be64(bad_sector
, &buffer
[12]);
2697 transport_send_check_condition_and_sense(struct se_cmd
*cmd
,
2698 sense_reason_t reason
, int from_transport
)
2700 unsigned char *buffer
= cmd
->sense_buffer
;
2701 unsigned long flags
;
2702 u8 asc
= 0, ascq
= 0;
2704 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2705 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2706 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2709 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
2710 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2712 if (!reason
&& from_transport
)
2715 if (!from_transport
)
2716 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
2719 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2720 * SENSE KEY values from include/scsi/scsi.h
2726 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2728 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2729 /* NO ADDITIONAL SENSE INFORMATION */
2730 buffer
[SPC_ASC_KEY_OFFSET
] = 0;
2731 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0;
2733 case TCM_NON_EXISTENT_LUN
:
2736 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2737 /* ILLEGAL REQUEST */
2738 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2739 /* LOGICAL UNIT NOT SUPPORTED */
2740 buffer
[SPC_ASC_KEY_OFFSET
] = 0x25;
2742 case TCM_UNSUPPORTED_SCSI_OPCODE
:
2743 case TCM_SECTOR_COUNT_TOO_MANY
:
2746 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2747 /* ILLEGAL REQUEST */
2748 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2749 /* INVALID COMMAND OPERATION CODE */
2750 buffer
[SPC_ASC_KEY_OFFSET
] = 0x20;
2752 case TCM_UNKNOWN_MODE_PAGE
:
2755 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2756 /* ILLEGAL REQUEST */
2757 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2758 /* INVALID FIELD IN CDB */
2759 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2761 case TCM_CHECK_CONDITION_ABORT_CMD
:
2764 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2765 /* ABORTED COMMAND */
2766 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2767 /* BUS DEVICE RESET FUNCTION OCCURRED */
2768 buffer
[SPC_ASC_KEY_OFFSET
] = 0x29;
2769 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2771 case TCM_INCORRECT_AMOUNT_OF_DATA
:
2774 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2775 /* ABORTED COMMAND */
2776 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2778 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2779 /* NOT ENOUGH UNSOLICITED DATA */
2780 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0d;
2782 case TCM_INVALID_CDB_FIELD
:
2785 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2786 /* ILLEGAL REQUEST */
2787 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2788 /* INVALID FIELD IN CDB */
2789 buffer
[SPC_ASC_KEY_OFFSET
] = 0x24;
2791 case TCM_INVALID_PARAMETER_LIST
:
2794 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2795 /* ILLEGAL REQUEST */
2796 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2797 /* INVALID FIELD IN PARAMETER LIST */
2798 buffer
[SPC_ASC_KEY_OFFSET
] = 0x26;
2800 case TCM_PARAMETER_LIST_LENGTH_ERROR
:
2803 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2804 /* ILLEGAL REQUEST */
2805 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2806 /* PARAMETER LIST LENGTH ERROR */
2807 buffer
[SPC_ASC_KEY_OFFSET
] = 0x1a;
2809 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
2812 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2813 /* ABORTED COMMAND */
2814 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2816 buffer
[SPC_ASC_KEY_OFFSET
] = 0x0c;
2817 /* UNEXPECTED_UNSOLICITED_DATA */
2818 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x0c;
2820 case TCM_SERVICE_CRC_ERROR
:
2823 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2824 /* ABORTED COMMAND */
2825 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2826 /* PROTOCOL SERVICE CRC ERROR */
2827 buffer
[SPC_ASC_KEY_OFFSET
] = 0x47;
2829 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x05;
2831 case TCM_SNACK_REJECTED
:
2834 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2835 /* ABORTED COMMAND */
2836 buffer
[SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2838 buffer
[SPC_ASC_KEY_OFFSET
] = 0x11;
2839 /* FAILED RETRANSMISSION REQUEST */
2840 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x13;
2842 case TCM_WRITE_PROTECTED
:
2845 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2847 buffer
[SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
2848 /* WRITE PROTECTED */
2849 buffer
[SPC_ASC_KEY_OFFSET
] = 0x27;
2851 case TCM_ADDRESS_OUT_OF_RANGE
:
2854 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2855 /* ILLEGAL REQUEST */
2856 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2857 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2858 buffer
[SPC_ASC_KEY_OFFSET
] = 0x21;
2860 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
2863 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2864 /* UNIT ATTENTION */
2865 buffer
[SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
2866 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
2867 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2868 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2870 case TCM_CHECK_CONDITION_NOT_READY
:
2873 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2875 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2876 transport_get_sense_codes(cmd
, &asc
, &ascq
);
2877 buffer
[SPC_ASC_KEY_OFFSET
] = asc
;
2878 buffer
[SPC_ASCQ_KEY_OFFSET
] = ascq
;
2880 case TCM_MISCOMPARE_VERIFY
:
2883 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2884 buffer
[SPC_SENSE_KEY_OFFSET
] = MISCOMPARE
;
2885 /* MISCOMPARE DURING VERIFY OPERATION */
2886 buffer
[SPC_ASC_KEY_OFFSET
] = 0x1d;
2887 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x00;
2889 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED
:
2892 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2893 /* ILLEGAL REQUEST */
2894 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2895 /* LOGICAL BLOCK GUARD CHECK FAILED */
2896 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2897 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x01;
2898 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2900 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED
:
2903 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2904 /* ILLEGAL REQUEST */
2905 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2906 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2907 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2908 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x02;
2909 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2911 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED
:
2914 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2915 /* ILLEGAL REQUEST */
2916 buffer
[SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2917 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2918 buffer
[SPC_ASC_KEY_OFFSET
] = 0x10;
2919 buffer
[SPC_ASCQ_KEY_OFFSET
] = 0x03;
2920 transport_err_sector_info(buffer
, cmd
->bad_sector
);
2922 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
2926 buffer
[SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2928 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2929 * Solaris initiators. Returning NOT READY instead means the
2930 * operations will be retried a finite number of times and we
2931 * can survive intermittent errors.
2933 buffer
[SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2934 /* LOGICAL UNIT COMMUNICATION FAILURE */
2935 buffer
[SPC_ASC_KEY_OFFSET
] = 0x08;
2939 * This code uses linux/include/scsi/scsi.h SAM status codes!
2941 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
2943 * Automatically padded, this value is encoded in the fabric's
2944 * data_length response PDU containing the SCSI defined sense data.
2946 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
;
2949 trace_target_cmd_complete(cmd
);
2950 return cmd
->se_tfo
->queue_status(cmd
);
2952 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
2954 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
2956 if (!(cmd
->transport_state
& CMD_T_ABORTED
))
2960 * If cmd has been aborted but either no status is to be sent or it has
2961 * already been sent, just return
2963 if (!send_status
|| !(cmd
->se_cmd_flags
& SCF_SEND_DELAYED_TAS
))
2966 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2967 cmd
->t_task_cdb
[0], cmd
->se_tfo
->get_task_tag(cmd
));
2969 cmd
->se_cmd_flags
&= ~SCF_SEND_DELAYED_TAS
;
2970 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
2971 trace_target_cmd_complete(cmd
);
2972 cmd
->se_tfo
->queue_status(cmd
);
2976 EXPORT_SYMBOL(transport_check_aborted_status
);
2978 void transport_send_task_abort(struct se_cmd
*cmd
)
2980 unsigned long flags
;
2982 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2983 if (cmd
->se_cmd_flags
& (SCF_SENT_CHECK_CONDITION
)) {
2984 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2987 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2990 * If there are still expected incoming fabric WRITEs, we wait
2991 * until until they have completed before sending a TASK_ABORTED
2992 * response. This response with TASK_ABORTED status will be
2993 * queued back to fabric module by transport_check_aborted_status().
2995 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
2996 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
2997 cmd
->transport_state
|= CMD_T_ABORTED
;
2998 cmd
->se_cmd_flags
|= SCF_SEND_DELAYED_TAS
;
3002 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
3004 transport_lun_remove_cmd(cmd
);
3006 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3007 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
3008 cmd
->se_tfo
->get_task_tag(cmd
));
3010 trace_target_cmd_complete(cmd
);
3011 cmd
->se_tfo
->queue_status(cmd
);
3014 static void target_tmr_work(struct work_struct
*work
)
3016 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3017 struct se_device
*dev
= cmd
->se_dev
;
3018 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
3021 switch (tmr
->function
) {
3022 case TMR_ABORT_TASK
:
3023 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
3025 case TMR_ABORT_TASK_SET
:
3027 case TMR_CLEAR_TASK_SET
:
3028 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
3031 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
3032 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
3033 TMR_FUNCTION_REJECTED
;
3035 case TMR_TARGET_WARM_RESET
:
3036 tmr
->response
= TMR_FUNCTION_REJECTED
;
3038 case TMR_TARGET_COLD_RESET
:
3039 tmr
->response
= TMR_FUNCTION_REJECTED
;
3042 pr_err("Uknown TMR function: 0x%02x.\n",
3044 tmr
->response
= TMR_FUNCTION_REJECTED
;
3048 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
3049 cmd
->se_tfo
->queue_tm_rsp(cmd
);
3051 transport_cmd_check_stop_to_fabric(cmd
);
3054 int transport_generic_handle_tmr(
3057 unsigned long flags
;
3059 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3060 cmd
->transport_state
|= CMD_T_ACTIVE
;
3061 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3063 INIT_WORK(&cmd
->work
, target_tmr_work
);
3064 queue_work(cmd
->se_dev
->tmr_wq
, &cmd
->work
);
3067 EXPORT_SYMBOL(transport_generic_handle_tmr
);