1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 * Nicholas A. Bellinger <nab@kernel.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ******************************************************************************/
29 #include <linux/net.h>
30 #include <linux/delay.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
38 #include <linux/cdrom.h>
39 #include <linux/module.h>
40 #include <linux/ratelimit.h>
41 #include <asm/unaligned.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/scsi_tcq.h>
48 #include <target/target_core_base.h>
49 #include <target/target_core_backend.h>
50 #include <target/target_core_fabric.h>
51 #include <target/target_core_configfs.h>
53 #include "target_core_internal.h"
54 #include "target_core_alua.h"
55 #include "target_core_pr.h"
56 #include "target_core_ua.h"
58 static int sub_api_initialized
;
60 static struct workqueue_struct
*target_completion_wq
;
61 static struct kmem_cache
*se_sess_cache
;
62 struct kmem_cache
*se_ua_cache
;
63 struct kmem_cache
*t10_pr_reg_cache
;
64 struct kmem_cache
*t10_alua_lu_gp_cache
;
65 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
66 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
67 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
69 static int transport_generic_write_pending(struct se_cmd
*);
70 static int transport_processing_thread(void *param
);
71 static int __transport_execute_tasks(struct se_device
*dev
, struct se_cmd
*);
72 static void transport_complete_task_attr(struct se_cmd
*cmd
);
73 static void transport_handle_queue_full(struct se_cmd
*cmd
,
74 struct se_device
*dev
);
75 static void transport_free_dev_tasks(struct se_cmd
*cmd
);
76 static int transport_generic_get_mem(struct se_cmd
*cmd
);
77 static void transport_put_cmd(struct se_cmd
*cmd
);
78 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
);
79 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
80 static void target_complete_ok_work(struct work_struct
*work
);
82 int init_se_kmem_caches(void)
84 se_sess_cache
= kmem_cache_create("se_sess_cache",
85 sizeof(struct se_session
), __alignof__(struct se_session
),
88 pr_err("kmem_cache_create() for struct se_session"
92 se_ua_cache
= kmem_cache_create("se_ua_cache",
93 sizeof(struct se_ua
), __alignof__(struct se_ua
),
96 pr_err("kmem_cache_create() for struct se_ua failed\n");
97 goto out_free_sess_cache
;
99 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
100 sizeof(struct t10_pr_registration
),
101 __alignof__(struct t10_pr_registration
), 0, NULL
);
102 if (!t10_pr_reg_cache
) {
103 pr_err("kmem_cache_create() for struct t10_pr_registration"
105 goto out_free_ua_cache
;
107 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
108 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
110 if (!t10_alua_lu_gp_cache
) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
113 goto out_free_pr_reg_cache
;
115 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
116 sizeof(struct t10_alua_lu_gp_member
),
117 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
118 if (!t10_alua_lu_gp_mem_cache
) {
119 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
121 goto out_free_lu_gp_cache
;
123 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
124 sizeof(struct t10_alua_tg_pt_gp
),
125 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
126 if (!t10_alua_tg_pt_gp_cache
) {
127 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
129 goto out_free_lu_gp_mem_cache
;
131 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
132 "t10_alua_tg_pt_gp_mem_cache",
133 sizeof(struct t10_alua_tg_pt_gp_member
),
134 __alignof__(struct t10_alua_tg_pt_gp_member
),
136 if (!t10_alua_tg_pt_gp_mem_cache
) {
137 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
139 goto out_free_tg_pt_gp_cache
;
142 target_completion_wq
= alloc_workqueue("target_completion",
144 if (!target_completion_wq
)
145 goto out_free_tg_pt_gp_mem_cache
;
149 out_free_tg_pt_gp_mem_cache
:
150 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
151 out_free_tg_pt_gp_cache
:
152 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
153 out_free_lu_gp_mem_cache
:
154 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
155 out_free_lu_gp_cache
:
156 kmem_cache_destroy(t10_alua_lu_gp_cache
);
157 out_free_pr_reg_cache
:
158 kmem_cache_destroy(t10_pr_reg_cache
);
160 kmem_cache_destroy(se_ua_cache
);
162 kmem_cache_destroy(se_sess_cache
);
167 void release_se_kmem_caches(void)
169 destroy_workqueue(target_completion_wq
);
170 kmem_cache_destroy(se_sess_cache
);
171 kmem_cache_destroy(se_ua_cache
);
172 kmem_cache_destroy(t10_pr_reg_cache
);
173 kmem_cache_destroy(t10_alua_lu_gp_cache
);
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
176 kmem_cache_destroy(t10_alua_tg_pt_gp_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 static void transport_init_queue_obj(struct se_queue_obj
*qobj
)
201 atomic_set(&qobj
->queue_cnt
, 0);
202 INIT_LIST_HEAD(&qobj
->qobj_list
);
203 init_waitqueue_head(&qobj
->thread_wq
);
204 spin_lock_init(&qobj
->cmd_queue_lock
);
207 void transport_subsystem_check_init(void)
211 if (sub_api_initialized
)
214 ret
= request_module("target_core_iblock");
216 pr_err("Unable to load target_core_iblock\n");
218 ret
= request_module("target_core_file");
220 pr_err("Unable to load target_core_file\n");
222 ret
= request_module("target_core_pscsi");
224 pr_err("Unable to load target_core_pscsi\n");
226 ret
= request_module("target_core_stgt");
228 pr_err("Unable to load target_core_stgt\n");
230 sub_api_initialized
= 1;
234 struct se_session
*transport_init_session(void)
236 struct se_session
*se_sess
;
238 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
240 pr_err("Unable to allocate struct se_session from"
242 return ERR_PTR(-ENOMEM
);
244 INIT_LIST_HEAD(&se_sess
->sess_list
);
245 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
246 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
247 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
248 spin_lock_init(&se_sess
->sess_cmd_lock
);
249 kref_init(&se_sess
->sess_kref
);
253 EXPORT_SYMBOL(transport_init_session
);
256 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
258 void __transport_register_session(
259 struct se_portal_group
*se_tpg
,
260 struct se_node_acl
*se_nacl
,
261 struct se_session
*se_sess
,
262 void *fabric_sess_ptr
)
264 unsigned char buf
[PR_REG_ISID_LEN
];
266 se_sess
->se_tpg
= se_tpg
;
267 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
269 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
271 * Only set for struct se_session's that will actually be moving I/O.
272 * eg: *NOT* discovery sessions.
276 * If the fabric module supports an ISID based TransportID,
277 * save this value in binary from the fabric I_T Nexus now.
279 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
280 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
281 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
282 &buf
[0], PR_REG_ISID_LEN
);
283 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
285 kref_get(&se_nacl
->acl_kref
);
287 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
289 * The se_nacl->nacl_sess pointer will be set to the
290 * last active I_T Nexus for each struct se_node_acl.
292 se_nacl
->nacl_sess
= se_sess
;
294 list_add_tail(&se_sess
->sess_acl_list
,
295 &se_nacl
->acl_sess_list
);
296 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
298 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
300 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
301 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
303 EXPORT_SYMBOL(__transport_register_session
);
305 void transport_register_session(
306 struct se_portal_group
*se_tpg
,
307 struct se_node_acl
*se_nacl
,
308 struct se_session
*se_sess
,
309 void *fabric_sess_ptr
)
313 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
314 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
315 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
317 EXPORT_SYMBOL(transport_register_session
);
319 static void target_release_session(struct kref
*kref
)
321 struct se_session
*se_sess
= container_of(kref
,
322 struct se_session
, sess_kref
);
323 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
325 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
328 void target_get_session(struct se_session
*se_sess
)
330 kref_get(&se_sess
->sess_kref
);
332 EXPORT_SYMBOL(target_get_session
);
334 int target_put_session(struct se_session
*se_sess
)
336 return kref_put(&se_sess
->sess_kref
, target_release_session
);
338 EXPORT_SYMBOL(target_put_session
);
340 static void target_complete_nacl(struct kref
*kref
)
342 struct se_node_acl
*nacl
= container_of(kref
,
343 struct se_node_acl
, acl_kref
);
345 complete(&nacl
->acl_free_comp
);
348 void target_put_nacl(struct se_node_acl
*nacl
)
350 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
353 void transport_deregister_session_configfs(struct se_session
*se_sess
)
355 struct se_node_acl
*se_nacl
;
358 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
360 se_nacl
= se_sess
->se_node_acl
;
362 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
363 if (se_nacl
->acl_stop
== 0)
364 list_del(&se_sess
->sess_acl_list
);
366 * If the session list is empty, then clear the pointer.
367 * Otherwise, set the struct se_session pointer from the tail
368 * element of the per struct se_node_acl active session list.
370 if (list_empty(&se_nacl
->acl_sess_list
))
371 se_nacl
->nacl_sess
= NULL
;
373 se_nacl
->nacl_sess
= container_of(
374 se_nacl
->acl_sess_list
.prev
,
375 struct se_session
, sess_acl_list
);
377 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
380 EXPORT_SYMBOL(transport_deregister_session_configfs
);
382 void transport_free_session(struct se_session
*se_sess
)
384 kmem_cache_free(se_sess_cache
, se_sess
);
386 EXPORT_SYMBOL(transport_free_session
);
388 void transport_deregister_session(struct se_session
*se_sess
)
390 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
391 struct target_core_fabric_ops
*se_tfo
;
392 struct se_node_acl
*se_nacl
;
394 bool comp_nacl
= true;
397 transport_free_session(se_sess
);
400 se_tfo
= se_tpg
->se_tpg_tfo
;
402 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
403 list_del(&se_sess
->sess_list
);
404 se_sess
->se_tpg
= NULL
;
405 se_sess
->fabric_sess_ptr
= NULL
;
406 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
409 * Determine if we need to do extra work for this initiator node's
410 * struct se_node_acl if it had been previously dynamically generated.
412 se_nacl
= se_sess
->se_node_acl
;
414 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
415 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
416 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
417 list_del(&se_nacl
->acl_list
);
418 se_tpg
->num_node_acls
--;
419 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
420 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
421 core_free_device_list_for_node(se_nacl
, se_tpg
);
422 se_tfo
->tpg_release_fabric_acl(se_tpg
, se_nacl
);
425 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
428 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
430 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
431 se_tpg
->se_tpg_tfo
->get_fabric_name());
433 * If last kref is dropping now for an explict NodeACL, awake sleeping
434 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
437 if (se_nacl
&& comp_nacl
== true)
438 target_put_nacl(se_nacl
);
440 transport_free_session(se_sess
);
442 EXPORT_SYMBOL(transport_deregister_session
);
445 * Called with cmd->t_state_lock held.
447 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
449 struct se_device
*dev
= cmd
->se_dev
;
450 struct se_task
*task
;
456 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
457 if (task
->task_flags
& TF_ACTIVE
)
460 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
461 if (task
->t_state_active
) {
462 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
463 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
465 list_del(&task
->t_state_list
);
466 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
467 task
->t_state_active
= false;
469 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
474 /* transport_cmd_check_stop():
476 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
477 * 'transport_off = 2' determines if task_dev_state should be removed.
479 * A non-zero u8 t_state sets cmd->t_state.
480 * Returns 1 when command is stopped, else 0.
482 static int transport_cmd_check_stop(
489 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
491 * Determine if IOCTL context caller in requesting the stopping of this
492 * command for LUN shutdown purposes.
494 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
495 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
496 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
498 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
499 if (transport_off
== 2)
500 transport_all_task_dev_remove_state(cmd
);
501 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
503 complete(&cmd
->transport_lun_stop_comp
);
507 * Determine if frontend context caller is requesting the stopping of
508 * this command for frontend exceptions.
510 if (cmd
->transport_state
& CMD_T_STOP
) {
511 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
513 cmd
->se_tfo
->get_task_tag(cmd
));
515 if (transport_off
== 2)
516 transport_all_task_dev_remove_state(cmd
);
519 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
522 if (transport_off
== 2)
524 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
526 complete(&cmd
->t_transport_stop_comp
);
530 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
531 if (transport_off
== 2) {
532 transport_all_task_dev_remove_state(cmd
);
534 * Clear struct se_cmd->se_lun before the transport_off == 2
535 * handoff to fabric module.
539 * Some fabric modules like tcm_loop can release
540 * their internally allocated I/O reference now and
543 * Fabric modules are expected to return '1' here if the
544 * se_cmd being passed is released at this point,
545 * or zero if not being released.
547 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
548 spin_unlock_irqrestore(
549 &cmd
->t_state_lock
, flags
);
551 return cmd
->se_tfo
->check_stop_free(cmd
);
554 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
558 cmd
->t_state
= t_state
;
559 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
564 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
566 return transport_cmd_check_stop(cmd
, 2, 0);
569 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
571 struct se_lun
*lun
= cmd
->se_lun
;
577 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
578 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
579 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
580 transport_all_task_dev_remove_state(cmd
);
582 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
584 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
585 if (!list_empty(&cmd
->se_lun_node
))
586 list_del_init(&cmd
->se_lun_node
);
587 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
590 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
592 if (!(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
593 transport_lun_remove_cmd(cmd
);
595 if (transport_cmd_check_stop_to_fabric(cmd
))
598 transport_remove_cmd_from_queue(cmd
);
599 transport_put_cmd(cmd
);
603 static void transport_add_cmd_to_queue(struct se_cmd
*cmd
, int t_state
,
606 struct se_device
*dev
= cmd
->se_dev
;
607 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
611 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
612 cmd
->t_state
= t_state
;
613 cmd
->transport_state
|= CMD_T_ACTIVE
;
614 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
617 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
619 /* If the cmd is already on the list, remove it before we add it */
620 if (!list_empty(&cmd
->se_queue_node
))
621 list_del(&cmd
->se_queue_node
);
623 atomic_inc(&qobj
->queue_cnt
);
626 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
628 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
629 cmd
->transport_state
|= CMD_T_QUEUED
;
630 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
632 wake_up_interruptible(&qobj
->thread_wq
);
635 static struct se_cmd
*
636 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
641 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
642 if (list_empty(&qobj
->qobj_list
)) {
643 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
646 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
648 cmd
->transport_state
&= ~CMD_T_QUEUED
;
649 list_del_init(&cmd
->se_queue_node
);
650 atomic_dec(&qobj
->queue_cnt
);
651 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
656 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
)
658 struct se_queue_obj
*qobj
= &cmd
->se_dev
->dev_queue_obj
;
661 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
662 if (!(cmd
->transport_state
& CMD_T_QUEUED
)) {
663 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
666 cmd
->transport_state
&= ~CMD_T_QUEUED
;
667 atomic_dec(&qobj
->queue_cnt
);
668 list_del_init(&cmd
->se_queue_node
);
669 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
673 * Completion function used by TCM subsystem plugins (such as FILEIO)
674 * for queueing up response from struct se_subsystem_api->do_task()
676 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
678 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
679 struct se_task
, t_list
);
682 cmd
->scsi_status
= SAM_STAT_GOOD
;
683 task
->task_scsi_status
= GOOD
;
685 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
686 task
->task_se_cmd
->scsi_sense_reason
=
687 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
691 transport_complete_task(task
, good
);
693 EXPORT_SYMBOL(transport_complete_sync_cache
);
695 static void target_complete_failure_work(struct work_struct
*work
)
697 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
699 transport_generic_request_failure(cmd
);
702 /* transport_complete_task():
704 * Called from interrupt and non interrupt context depending
705 * on the transport plugin.
707 void transport_complete_task(struct se_task
*task
, int success
)
709 struct se_cmd
*cmd
= task
->task_se_cmd
;
710 struct se_device
*dev
= cmd
->se_dev
;
713 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
714 task
->task_flags
&= ~TF_ACTIVE
;
717 * See if any sense data exists, if so set the TASK_SENSE flag.
718 * Also check for any other post completion work that needs to be
719 * done by the plugins.
721 if (dev
&& dev
->transport
->transport_complete
) {
722 if (dev
->transport
->transport_complete(task
) != 0) {
723 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
724 task
->task_flags
|= TF_HAS_SENSE
;
730 * See if we are waiting for outstanding struct se_task
731 * to complete for an exception condition
733 if (task
->task_flags
& TF_REQUEST_STOP
) {
734 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
735 complete(&task
->task_stop_comp
);
740 cmd
->transport_state
|= CMD_T_FAILED
;
743 * Decrement the outstanding t_task_cdbs_left count. The last
744 * struct se_task from struct se_cmd will complete itself into the
745 * device queue depending upon int success.
747 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
748 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
752 * Check for case where an explict ABORT_TASK has been received
753 * and transport_wait_for_tasks() will be waiting for completion..
755 if (cmd
->transport_state
& CMD_T_ABORTED
&&
756 cmd
->transport_state
& CMD_T_STOP
) {
757 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
758 complete(&cmd
->t_transport_stop_comp
);
760 } else if (cmd
->transport_state
& CMD_T_FAILED
) {
761 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
762 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
764 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
767 cmd
->t_state
= TRANSPORT_COMPLETE
;
768 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
769 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
771 queue_work(target_completion_wq
, &cmd
->work
);
773 EXPORT_SYMBOL(transport_complete_task
);
776 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
777 * struct se_task list are ready to be added to the active execution list
780 * Called with se_dev_t->execute_task_lock called.
782 static inline int transport_add_task_check_sam_attr(
783 struct se_task
*task
,
784 struct se_task
*task_prev
,
785 struct se_device
*dev
)
788 * No SAM Task attribute emulation enabled, add to tail of
791 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
792 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
796 * HEAD_OF_QUEUE attribute for received CDB, which means
797 * the first task that is associated with a struct se_cmd goes to
798 * head of the struct se_device->execute_task_list, and task_prev
799 * after that for each subsequent task
801 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
802 list_add(&task
->t_execute_list
,
803 (task_prev
!= NULL
) ?
804 &task_prev
->t_execute_list
:
805 &dev
->execute_task_list
);
807 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
808 " in execution queue\n",
809 task
->task_se_cmd
->t_task_cdb
[0]);
813 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
814 * transitioned from Dermant -> Active state, and are added to the end
815 * of the struct se_device->execute_task_list
817 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
821 /* __transport_add_task_to_execute_queue():
823 * Called with se_dev_t->execute_task_lock called.
825 static void __transport_add_task_to_execute_queue(
826 struct se_task
*task
,
827 struct se_task
*task_prev
,
828 struct se_device
*dev
)
832 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
833 atomic_inc(&dev
->execute_tasks
);
835 if (task
->t_state_active
)
838 * Determine if this task needs to go to HEAD_OF_QUEUE for the
839 * state list as well. Running with SAM Task Attribute emulation
840 * will always return head_of_queue == 0 here
843 list_add(&task
->t_state_list
, (task_prev
) ?
844 &task_prev
->t_state_list
:
845 &dev
->state_task_list
);
847 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
849 task
->t_state_active
= true;
851 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
852 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
856 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
858 struct se_device
*dev
= cmd
->se_dev
;
859 struct se_task
*task
;
862 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
863 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
864 spin_lock(&dev
->execute_task_lock
);
865 if (!task
->t_state_active
) {
866 list_add_tail(&task
->t_state_list
,
867 &dev
->state_task_list
);
868 task
->t_state_active
= true;
870 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
871 task
->task_se_cmd
->se_tfo
->get_task_tag(
872 task
->task_se_cmd
), task
, dev
);
874 spin_unlock(&dev
->execute_task_lock
);
876 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
879 static void __transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
881 struct se_device
*dev
= cmd
->se_dev
;
882 struct se_task
*task
, *task_prev
= NULL
;
884 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
885 if (!list_empty(&task
->t_execute_list
))
888 * __transport_add_task_to_execute_queue() handles the
889 * SAM Task Attribute emulation if enabled
891 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
896 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
899 struct se_device
*dev
= cmd
->se_dev
;
901 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
902 __transport_add_tasks_from_cmd(cmd
);
903 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
906 void __transport_remove_task_from_execute_queue(struct se_task
*task
,
907 struct se_device
*dev
)
909 list_del_init(&task
->t_execute_list
);
910 atomic_dec(&dev
->execute_tasks
);
913 static void transport_remove_task_from_execute_queue(
914 struct se_task
*task
,
915 struct se_device
*dev
)
919 if (WARN_ON(list_empty(&task
->t_execute_list
)))
922 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
923 __transport_remove_task_from_execute_queue(task
, dev
);
924 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
928 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
931 static void target_qf_do_work(struct work_struct
*work
)
933 struct se_device
*dev
= container_of(work
, struct se_device
,
935 LIST_HEAD(qf_cmd_list
);
936 struct se_cmd
*cmd
, *cmd_tmp
;
938 spin_lock_irq(&dev
->qf_cmd_lock
);
939 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
940 spin_unlock_irq(&dev
->qf_cmd_lock
);
942 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
943 list_del(&cmd
->se_qf_node
);
944 atomic_dec(&dev
->dev_qf_count
);
945 smp_mb__after_atomic_dec();
947 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
948 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
949 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
950 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
953 transport_add_cmd_to_queue(cmd
, cmd
->t_state
, true);
957 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
959 switch (cmd
->data_direction
) {
962 case DMA_FROM_DEVICE
:
966 case DMA_BIDIRECTIONAL
:
975 void transport_dump_dev_state(
976 struct se_device
*dev
,
980 *bl
+= sprintf(b
+ *bl
, "Status: ");
981 switch (dev
->dev_status
) {
982 case TRANSPORT_DEVICE_ACTIVATED
:
983 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
985 case TRANSPORT_DEVICE_DEACTIVATED
:
986 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
988 case TRANSPORT_DEVICE_SHUTDOWN
:
989 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
991 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
992 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
993 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
996 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1000 *bl
+= sprintf(b
+ *bl
, " Execute/Max Queue Depth: %d/%d",
1001 atomic_read(&dev
->execute_tasks
), dev
->queue_depth
);
1002 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1003 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
1004 *bl
+= sprintf(b
+ *bl
, " ");
1007 void transport_dump_vpd_proto_id(
1008 struct t10_vpd
*vpd
,
1009 unsigned char *p_buf
,
1012 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1015 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1016 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1018 switch (vpd
->protocol_identifier
) {
1020 sprintf(buf
+len
, "Fibre Channel\n");
1023 sprintf(buf
+len
, "Parallel SCSI\n");
1026 sprintf(buf
+len
, "SSA\n");
1029 sprintf(buf
+len
, "IEEE 1394\n");
1032 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1036 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1039 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1042 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1046 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1049 sprintf(buf
+len
, "Unknown 0x%02x\n",
1050 vpd
->protocol_identifier
);
1055 strncpy(p_buf
, buf
, p_buf_len
);
1057 pr_debug("%s", buf
);
1061 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1064 * Check if the Protocol Identifier Valid (PIV) bit is set..
1066 * from spc3r23.pdf section 7.5.1
1068 if (page_83
[1] & 0x80) {
1069 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1070 vpd
->protocol_identifier_set
= 1;
1071 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1074 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1076 int transport_dump_vpd_assoc(
1077 struct t10_vpd
*vpd
,
1078 unsigned char *p_buf
,
1081 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1085 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1086 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1088 switch (vpd
->association
) {
1090 sprintf(buf
+len
, "addressed logical unit\n");
1093 sprintf(buf
+len
, "target port\n");
1096 sprintf(buf
+len
, "SCSI target device\n");
1099 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1105 strncpy(p_buf
, buf
, p_buf_len
);
1107 pr_debug("%s", buf
);
1112 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1115 * The VPD identification association..
1117 * from spc3r23.pdf Section 7.6.3.1 Table 297
1119 vpd
->association
= (page_83
[1] & 0x30);
1120 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1122 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1124 int transport_dump_vpd_ident_type(
1125 struct t10_vpd
*vpd
,
1126 unsigned char *p_buf
,
1129 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1133 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1134 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1136 switch (vpd
->device_identifier_type
) {
1138 sprintf(buf
+len
, "Vendor specific\n");
1141 sprintf(buf
+len
, "T10 Vendor ID based\n");
1144 sprintf(buf
+len
, "EUI-64 based\n");
1147 sprintf(buf
+len
, "NAA\n");
1150 sprintf(buf
+len
, "Relative target port identifier\n");
1153 sprintf(buf
+len
, "SCSI name string\n");
1156 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1157 vpd
->device_identifier_type
);
1163 if (p_buf_len
< strlen(buf
)+1)
1165 strncpy(p_buf
, buf
, p_buf_len
);
1167 pr_debug("%s", buf
);
1173 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1176 * The VPD identifier type..
1178 * from spc3r23.pdf Section 7.6.3.1 Table 298
1180 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1181 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1183 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1185 int transport_dump_vpd_ident(
1186 struct t10_vpd
*vpd
,
1187 unsigned char *p_buf
,
1190 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1193 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1195 switch (vpd
->device_identifier_code_set
) {
1196 case 0x01: /* Binary */
1197 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1198 &vpd
->device_identifier
[0]);
1200 case 0x02: /* ASCII */
1201 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1202 &vpd
->device_identifier
[0]);
1204 case 0x03: /* UTF-8 */
1205 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1206 &vpd
->device_identifier
[0]);
1209 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1210 " 0x%02x", vpd
->device_identifier_code_set
);
1216 strncpy(p_buf
, buf
, p_buf_len
);
1218 pr_debug("%s", buf
);
1224 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1226 static const char hex_str
[] = "0123456789abcdef";
1227 int j
= 0, i
= 4; /* offset to start of the identifer */
1230 * The VPD Code Set (encoding)
1232 * from spc3r23.pdf Section 7.6.3.1 Table 296
1234 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1235 switch (vpd
->device_identifier_code_set
) {
1236 case 0x01: /* Binary */
1237 vpd
->device_identifier
[j
++] =
1238 hex_str
[vpd
->device_identifier_type
];
1239 while (i
< (4 + page_83
[3])) {
1240 vpd
->device_identifier
[j
++] =
1241 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1242 vpd
->device_identifier
[j
++] =
1243 hex_str
[page_83
[i
] & 0x0f];
1247 case 0x02: /* ASCII */
1248 case 0x03: /* UTF-8 */
1249 while (i
< (4 + page_83
[3]))
1250 vpd
->device_identifier
[j
++] = page_83
[i
++];
1256 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1258 EXPORT_SYMBOL(transport_set_vpd_ident
);
1260 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1263 * If this device is from Target_Core_Mod/pSCSI, disable the
1264 * SAM Task Attribute emulation.
1266 * This is currently not available in upsream Linux/SCSI Target
1267 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1269 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1270 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1274 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1275 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1276 " device\n", dev
->transport
->name
,
1277 dev
->transport
->get_device_rev(dev
));
1280 static void scsi_dump_inquiry(struct se_device
*dev
)
1282 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1286 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1288 for (i
= 0; i
< 8; i
++)
1289 if (wwn
->vendor
[i
] >= 0x20)
1290 buf
[i
] = wwn
->vendor
[i
];
1294 pr_debug(" Vendor: %s\n", buf
);
1296 for (i
= 0; i
< 16; i
++)
1297 if (wwn
->model
[i
] >= 0x20)
1298 buf
[i
] = wwn
->model
[i
];
1302 pr_debug(" Model: %s\n", buf
);
1304 for (i
= 0; i
< 4; i
++)
1305 if (wwn
->revision
[i
] >= 0x20)
1306 buf
[i
] = wwn
->revision
[i
];
1310 pr_debug(" Revision: %s\n", buf
);
1312 device_type
= dev
->transport
->get_device_type(dev
);
1313 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1314 pr_debug(" ANSI SCSI revision: %02x\n",
1315 dev
->transport
->get_device_rev(dev
));
1318 struct se_device
*transport_add_device_to_core_hba(
1320 struct se_subsystem_api
*transport
,
1321 struct se_subsystem_dev
*se_dev
,
1323 void *transport_dev
,
1324 struct se_dev_limits
*dev_limits
,
1325 const char *inquiry_prod
,
1326 const char *inquiry_rev
)
1329 struct se_device
*dev
;
1331 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1333 pr_err("Unable to allocate memory for se_dev_t\n");
1337 transport_init_queue_obj(&dev
->dev_queue_obj
);
1338 dev
->dev_flags
= device_flags
;
1339 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1340 dev
->dev_ptr
= transport_dev
;
1342 dev
->se_sub_dev
= se_dev
;
1343 dev
->transport
= transport
;
1344 INIT_LIST_HEAD(&dev
->dev_list
);
1345 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1346 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1347 INIT_LIST_HEAD(&dev
->execute_task_list
);
1348 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1349 INIT_LIST_HEAD(&dev
->state_task_list
);
1350 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1351 spin_lock_init(&dev
->execute_task_lock
);
1352 spin_lock_init(&dev
->delayed_cmd_lock
);
1353 spin_lock_init(&dev
->dev_reservation_lock
);
1354 spin_lock_init(&dev
->dev_status_lock
);
1355 spin_lock_init(&dev
->se_port_lock
);
1356 spin_lock_init(&dev
->se_tmr_lock
);
1357 spin_lock_init(&dev
->qf_cmd_lock
);
1358 atomic_set(&dev
->dev_ordered_id
, 0);
1360 se_dev_set_default_attribs(dev
, dev_limits
);
1362 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1363 dev
->creation_time
= get_jiffies_64();
1364 spin_lock_init(&dev
->stats_lock
);
1366 spin_lock(&hba
->device_lock
);
1367 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1369 spin_unlock(&hba
->device_lock
);
1371 * Setup the SAM Task Attribute emulation for struct se_device
1373 core_setup_task_attr_emulation(dev
);
1375 * Force PR and ALUA passthrough emulation with internal object use.
1377 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1379 * Setup the Reservations infrastructure for struct se_device
1381 core_setup_reservations(dev
, force_pt
);
1383 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1385 if (core_setup_alua(dev
, force_pt
) < 0)
1389 * Startup the struct se_device processing thread
1391 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1392 "LIO_%s", dev
->transport
->name
);
1393 if (IS_ERR(dev
->process_thread
)) {
1394 pr_err("Unable to create kthread: LIO_%s\n",
1395 dev
->transport
->name
);
1399 * Setup work_queue for QUEUE_FULL
1401 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1403 * Preload the initial INQUIRY const values if we are doing
1404 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1405 * passthrough because this is being provided by the backend LLD.
1406 * This is required so that transport_get_inquiry() copies these
1407 * originals once back into DEV_T10_WWN(dev) for the virtual device
1410 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1411 if (!inquiry_prod
|| !inquiry_rev
) {
1412 pr_err("All non TCM/pSCSI plugins require"
1413 " INQUIRY consts\n");
1417 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1418 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1419 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1421 scsi_dump_inquiry(dev
);
1425 kthread_stop(dev
->process_thread
);
1427 spin_lock(&hba
->device_lock
);
1428 list_del(&dev
->dev_list
);
1430 spin_unlock(&hba
->device_lock
);
1432 se_release_vpd_for_dev(dev
);
1438 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1440 /* transport_generic_prepare_cdb():
1442 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1443 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1444 * The point of this is since we are mapping iSCSI LUNs to
1445 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1446 * devices and HBAs for a loop.
1448 static inline void transport_generic_prepare_cdb(
1452 case READ_10
: /* SBC - RDProtect */
1453 case READ_12
: /* SBC - RDProtect */
1454 case READ_16
: /* SBC - RDProtect */
1455 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1456 case VERIFY
: /* SBC - VRProtect */
1457 case VERIFY_16
: /* SBC - VRProtect */
1458 case WRITE_VERIFY
: /* SBC - VRProtect */
1459 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1462 cdb
[1] &= 0x1f; /* clear logical unit number */
1467 static struct se_task
*
1468 transport_generic_get_task(struct se_cmd
*cmd
,
1469 enum dma_data_direction data_direction
)
1471 struct se_task
*task
;
1472 struct se_device
*dev
= cmd
->se_dev
;
1474 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1476 pr_err("Unable to allocate struct se_task\n");
1480 INIT_LIST_HEAD(&task
->t_list
);
1481 INIT_LIST_HEAD(&task
->t_execute_list
);
1482 INIT_LIST_HEAD(&task
->t_state_list
);
1483 init_completion(&task
->task_stop_comp
);
1484 task
->task_se_cmd
= cmd
;
1485 task
->task_data_direction
= data_direction
;
1490 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1493 * Used by fabric modules containing a local struct se_cmd within their
1494 * fabric dependent per I/O descriptor.
1496 void transport_init_se_cmd(
1498 struct target_core_fabric_ops
*tfo
,
1499 struct se_session
*se_sess
,
1503 unsigned char *sense_buffer
)
1505 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1506 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1507 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1508 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1509 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1510 INIT_LIST_HEAD(&cmd
->t_task_list
);
1511 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1512 init_completion(&cmd
->transport_lun_stop_comp
);
1513 init_completion(&cmd
->t_transport_stop_comp
);
1514 init_completion(&cmd
->cmd_wait_comp
);
1515 spin_lock_init(&cmd
->t_state_lock
);
1516 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1519 cmd
->se_sess
= se_sess
;
1520 cmd
->data_length
= data_length
;
1521 cmd
->data_direction
= data_direction
;
1522 cmd
->sam_task_attr
= task_attr
;
1523 cmd
->sense_buffer
= sense_buffer
;
1525 EXPORT_SYMBOL(transport_init_se_cmd
);
1527 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1530 * Check if SAM Task Attribute emulation is enabled for this
1531 * struct se_device storage object
1533 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1536 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1537 pr_debug("SAM Task Attribute ACA"
1538 " emulation is not supported\n");
1542 * Used to determine when ORDERED commands should go from
1543 * Dormant to Active status.
1545 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1546 smp_mb__after_atomic_inc();
1547 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1548 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1549 cmd
->se_dev
->transport
->name
);
1553 /* transport_generic_allocate_tasks():
1555 * Called from fabric RX Thread.
1557 int transport_generic_allocate_tasks(
1563 transport_generic_prepare_cdb(cdb
);
1565 * Ensure that the received CDB is less than the max (252 + 8) bytes
1566 * for VARIABLE_LENGTH_CMD
1568 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1569 pr_err("Received SCSI CDB with command_size: %d that"
1570 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1571 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1572 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1573 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1577 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1578 * allocate the additional extended CDB buffer now.. Otherwise
1579 * setup the pointer from __t_task_cdb to t_task_cdb.
1581 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1582 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1584 if (!cmd
->t_task_cdb
) {
1585 pr_err("Unable to allocate cmd->t_task_cdb"
1586 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1587 scsi_command_size(cdb
),
1588 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1589 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1590 cmd
->scsi_sense_reason
=
1591 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1595 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1597 * Copy the original CDB into cmd->
1599 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1601 * Setup the received CDB based on SCSI defined opcodes and
1602 * perform unit attention, persistent reservations and ALUA
1603 * checks for virtual device backends. The cmd->t_task_cdb
1604 * pointer is expected to be setup before we reach this point.
1606 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1610 * Check for SAM Task Attribute Emulation
1612 if (transport_check_alloc_task_attr(cmd
) < 0) {
1613 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1614 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1617 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1618 if (cmd
->se_lun
->lun_sep
)
1619 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1620 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1623 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1626 * Used by fabric module frontends to queue tasks directly.
1627 * Many only be used from process context only
1629 int transport_handle_cdb_direct(
1636 pr_err("cmd->se_lun is NULL\n");
1639 if (in_interrupt()) {
1641 pr_err("transport_generic_handle_cdb cannot be called"
1642 " from interrupt context\n");
1646 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1647 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1648 * in existing usage to ensure that outstanding descriptors are handled
1649 * correctly during shutdown via transport_wait_for_tasks()
1651 * Also, we don't take cmd->t_state_lock here as we only expect
1652 * this to be called for initial descriptor submission.
1654 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1655 cmd
->transport_state
|= CMD_T_ACTIVE
;
1658 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1659 * so follow TRANSPORT_NEW_CMD processing thread context usage
1660 * and call transport_generic_request_failure() if necessary..
1662 ret
= transport_generic_new_cmd(cmd
);
1664 transport_generic_request_failure(cmd
);
1668 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1671 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1673 * @se_cmd: command descriptor to submit
1674 * @se_sess: associated se_sess for endpoint
1675 * @cdb: pointer to SCSI CDB
1676 * @sense: pointer to SCSI sense buffer
1677 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1678 * @data_length: fabric expected data transfer length
1679 * @task_addr: SAM task attribute
1680 * @data_dir: DMA data direction
1681 * @flags: flags for command submission from target_sc_flags_tables
1683 * This may only be called from process context, and also currently
1684 * assumes internal allocation of fabric payload buffer by target-core.
1686 void target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1687 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1688 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1690 struct se_portal_group
*se_tpg
;
1693 se_tpg
= se_sess
->se_tpg
;
1695 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1696 BUG_ON(in_interrupt());
1698 * Initialize se_cmd for target operation. From this point
1699 * exceptions are handled by sending exception status via
1700 * target_core_fabric_ops->queue_status() callback
1702 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1703 data_length
, data_dir
, task_attr
, sense
);
1705 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1706 * se_sess->sess_cmd_list. A second kref_get here is necessary
1707 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1708 * kref_put() to happen during fabric packet acknowledgement.
1710 target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1712 * Signal bidirectional data payloads to target-core
1714 if (flags
& TARGET_SCF_BIDI_OP
)
1715 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1717 * Locate se_lun pointer and attach it to struct se_cmd
1719 if (transport_lookup_cmd_lun(se_cmd
, unpacked_lun
) < 0) {
1720 transport_send_check_condition_and_sense(se_cmd
,
1721 se_cmd
->scsi_sense_reason
, 0);
1722 target_put_sess_cmd(se_sess
, se_cmd
);
1726 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1727 * allocate the necessary tasks to complete the received CDB+data
1729 rc
= transport_generic_allocate_tasks(se_cmd
, cdb
);
1731 transport_generic_request_failure(se_cmd
);
1735 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1736 * for immediate execution of READs, otherwise wait for
1737 * transport_generic_handle_data() to be called for WRITEs
1738 * when fabric has filled the incoming buffer.
1740 transport_handle_cdb_direct(se_cmd
);
1743 EXPORT_SYMBOL(target_submit_cmd
);
1745 static void target_complete_tmr_failure(struct work_struct
*work
)
1747 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1749 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1750 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1751 transport_generic_free_cmd(se_cmd
, 0);
1755 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1758 * @se_cmd: command descriptor to submit
1759 * @se_sess: associated se_sess for endpoint
1760 * @sense: pointer to SCSI sense buffer
1761 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1762 * @fabric_context: fabric context for TMR req
1763 * @tm_type: Type of TM request
1764 * @gfp: gfp type for caller
1765 * @tag: referenced task tag for TMR_ABORT_TASK
1766 * @flags: submit cmd flags
1768 * Callable from all contexts.
1771 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1772 unsigned char *sense
, u32 unpacked_lun
,
1773 void *fabric_tmr_ptr
, unsigned char tm_type
,
1774 gfp_t gfp
, unsigned int tag
, int flags
)
1776 struct se_portal_group
*se_tpg
;
1779 se_tpg
= se_sess
->se_tpg
;
1782 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1783 0, DMA_NONE
, MSG_SIMPLE_TAG
, sense
);
1785 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1786 * allocation failure.
1788 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1792 if (tm_type
== TMR_ABORT_TASK
)
1793 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1795 /* See target_submit_cmd for commentary */
1796 target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1798 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1801 * For callback during failure handling, push this work off
1802 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1804 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1805 schedule_work(&se_cmd
->work
);
1808 transport_generic_handle_tmr(se_cmd
);
1811 EXPORT_SYMBOL(target_submit_tmr
);
1814 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1815 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1816 * complete setup in TCM process context w/ TFO->new_cmd_map().
1818 int transport_generic_handle_cdb_map(
1823 pr_err("cmd->se_lun is NULL\n");
1827 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
, false);
1830 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1832 /* transport_generic_handle_data():
1836 int transport_generic_handle_data(
1840 * For the software fabric case, then we assume the nexus is being
1841 * failed/shutdown when signals are pending from the kthread context
1842 * caller, so we return a failure. For the HW target mode case running
1843 * in interrupt code, the signal_pending() check is skipped.
1845 if (!in_interrupt() && signal_pending(current
))
1848 * If the received CDB has aleady been ABORTED by the generic
1849 * target engine, we now call transport_check_aborted_status()
1850 * to queue any delated TASK_ABORTED status for the received CDB to the
1851 * fabric module as we are expecting no further incoming DATA OUT
1852 * sequences at this point.
1854 if (transport_check_aborted_status(cmd
, 1) != 0)
1857 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
, false);
1860 EXPORT_SYMBOL(transport_generic_handle_data
);
1862 /* transport_generic_handle_tmr():
1866 int transport_generic_handle_tmr(
1869 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
, false);
1872 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1875 * If the task is active, request it to be stopped and sleep until it
1878 bool target_stop_task(struct se_task
*task
, unsigned long *flags
)
1880 struct se_cmd
*cmd
= task
->task_se_cmd
;
1881 bool was_active
= false;
1883 if (task
->task_flags
& TF_ACTIVE
) {
1884 task
->task_flags
|= TF_REQUEST_STOP
;
1885 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1887 pr_debug("Task %p waiting to complete\n", task
);
1888 wait_for_completion(&task
->task_stop_comp
);
1889 pr_debug("Task %p stopped successfully\n", task
);
1891 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1892 atomic_dec(&cmd
->t_task_cdbs_left
);
1893 task
->task_flags
&= ~(TF_ACTIVE
| TF_REQUEST_STOP
);
1900 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1902 struct se_task
*task
, *task_tmp
;
1903 unsigned long flags
;
1906 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1907 cmd
->se_tfo
->get_task_tag(cmd
));
1910 * No tasks remain in the execution queue
1912 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1913 list_for_each_entry_safe(task
, task_tmp
,
1914 &cmd
->t_task_list
, t_list
) {
1915 pr_debug("Processing task %p\n", task
);
1917 * If the struct se_task has not been sent and is not active,
1918 * remove the struct se_task from the execution queue.
1920 if (!(task
->task_flags
& (TF_ACTIVE
| TF_SENT
))) {
1921 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1923 transport_remove_task_from_execute_queue(task
,
1926 pr_debug("Task %p removed from execute queue\n", task
);
1927 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1931 if (!target_stop_task(task
, &flags
)) {
1932 pr_debug("Task %p - did nothing\n", task
);
1936 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1942 * Handle SAM-esque emulation for generic transport request failures.
1944 void transport_generic_request_failure(struct se_cmd
*cmd
)
1948 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1949 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1950 cmd
->t_task_cdb
[0]);
1951 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1952 cmd
->se_tfo
->get_cmd_state(cmd
),
1953 cmd
->t_state
, cmd
->scsi_sense_reason
);
1954 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1955 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1956 " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1957 cmd
->t_task_list_num
,
1958 atomic_read(&cmd
->t_task_cdbs_left
),
1959 atomic_read(&cmd
->t_task_cdbs_sent
),
1960 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1961 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1962 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1963 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1966 * For SAM Task Attribute emulation for failed struct se_cmd
1968 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1969 transport_complete_task_attr(cmd
);
1971 switch (cmd
->scsi_sense_reason
) {
1972 case TCM_NON_EXISTENT_LUN
:
1973 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1974 case TCM_INVALID_CDB_FIELD
:
1975 case TCM_INVALID_PARAMETER_LIST
:
1976 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1977 case TCM_UNKNOWN_MODE_PAGE
:
1978 case TCM_WRITE_PROTECTED
:
1979 case TCM_CHECK_CONDITION_ABORT_CMD
:
1980 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1981 case TCM_CHECK_CONDITION_NOT_READY
:
1983 case TCM_RESERVATION_CONFLICT
:
1985 * No SENSE Data payload for this case, set SCSI Status
1986 * and queue the response to $FABRIC_MOD.
1988 * Uses linux/include/scsi/scsi.h SAM status codes defs
1990 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1992 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1993 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1996 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1999 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2000 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2001 cmd
->orig_fe_lun
, 0x2C,
2002 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2004 ret
= cmd
->se_tfo
->queue_status(cmd
);
2005 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2009 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
2010 cmd
->t_task_cdb
[0], cmd
->scsi_sense_reason
);
2011 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
2015 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2016 * make the call to transport_send_check_condition_and_sense()
2017 * directly. Otherwise expect the fabric to make the call to
2018 * transport_send_check_condition_and_sense() after handling
2019 * possible unsoliticied write data payloads.
2021 ret
= transport_send_check_condition_and_sense(cmd
,
2022 cmd
->scsi_sense_reason
, 0);
2023 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2027 transport_lun_remove_cmd(cmd
);
2028 if (!transport_cmd_check_stop_to_fabric(cmd
))
2033 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
2034 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2036 EXPORT_SYMBOL(transport_generic_request_failure
);
2038 static inline u32
transport_lba_21(unsigned char *cdb
)
2040 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2043 static inline u32
transport_lba_32(unsigned char *cdb
)
2045 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2048 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2050 unsigned int __v1
, __v2
;
2052 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2053 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2055 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2059 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2061 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2063 unsigned int __v1
, __v2
;
2065 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2066 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2068 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2071 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2073 unsigned long flags
;
2075 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2076 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2077 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2081 * Called from Fabric Module context from transport_execute_tasks()
2083 * The return of this function determins if the tasks from struct se_cmd
2084 * get added to the execution queue in transport_execute_tasks(),
2085 * or are added to the delayed or ordered lists here.
2087 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2089 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2092 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2093 * to allow the passed struct se_cmd list of tasks to the front of the list.
2095 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2096 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2097 " 0x%02x, se_ordered_id: %u\n",
2099 cmd
->se_ordered_id
);
2101 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2102 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2103 smp_mb__after_atomic_inc();
2105 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2106 " list, se_ordered_id: %u\n",
2108 cmd
->se_ordered_id
);
2110 * Add ORDERED command to tail of execution queue if
2111 * no other older commands exist that need to be
2114 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2118 * For SIMPLE and UNTAGGED Task Attribute commands
2120 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2121 smp_mb__after_atomic_inc();
2124 * Otherwise if one or more outstanding ORDERED task attribute exist,
2125 * add the dormant task(s) built for the passed struct se_cmd to the
2126 * execution queue and become in Active state for this struct se_device.
2128 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2130 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2131 * will be drained upon completion of HEAD_OF_QUEUE task.
2133 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2134 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2135 list_add_tail(&cmd
->se_delayed_node
,
2136 &cmd
->se_dev
->delayed_cmd_list
);
2137 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2139 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2140 " delayed CMD list, se_ordered_id: %u\n",
2141 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2142 cmd
->se_ordered_id
);
2144 * Return zero to let transport_execute_tasks() know
2145 * not to add the delayed tasks to the execution list.
2150 * Otherwise, no ORDERED task attributes exist..
2156 * Called from fabric module context in transport_generic_new_cmd() and
2157 * transport_generic_process_write()
2159 static int transport_execute_tasks(struct se_cmd
*cmd
)
2162 struct se_device
*se_dev
= cmd
->se_dev
;
2164 * Call transport_cmd_check_stop() to see if a fabric exception
2165 * has occurred that prevents execution.
2167 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2169 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2170 * attribute for the tasks of the received struct se_cmd CDB
2172 add_tasks
= transport_execute_task_attr(cmd
);
2176 * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2177 * adds associated se_tasks while holding dev->execute_task_lock
2178 * before I/O dispath to avoid a double spinlock access.
2180 __transport_execute_tasks(se_dev
, cmd
);
2185 __transport_execute_tasks(se_dev
, NULL
);
2190 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2191 * from struct se_device->execute_task_list and
2193 * Called from transport_processing_thread()
2195 static int __transport_execute_tasks(struct se_device
*dev
, struct se_cmd
*new_cmd
)
2198 struct se_cmd
*cmd
= NULL
;
2199 struct se_task
*task
= NULL
;
2200 unsigned long flags
;
2203 spin_lock_irq(&dev
->execute_task_lock
);
2204 if (new_cmd
!= NULL
)
2205 __transport_add_tasks_from_cmd(new_cmd
);
2207 if (list_empty(&dev
->execute_task_list
)) {
2208 spin_unlock_irq(&dev
->execute_task_lock
);
2211 task
= list_first_entry(&dev
->execute_task_list
,
2212 struct se_task
, t_execute_list
);
2213 __transport_remove_task_from_execute_queue(task
, dev
);
2214 spin_unlock_irq(&dev
->execute_task_lock
);
2216 cmd
= task
->task_se_cmd
;
2217 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2218 task
->task_flags
|= (TF_ACTIVE
| TF_SENT
);
2219 atomic_inc(&cmd
->t_task_cdbs_sent
);
2221 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2222 cmd
->t_task_list_num
)
2223 cmd
->transport_state
|= CMD_T_SENT
;
2225 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2227 if (cmd
->execute_task
)
2228 error
= cmd
->execute_task(task
);
2230 error
= dev
->transport
->do_task(task
);
2232 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2233 task
->task_flags
&= ~TF_ACTIVE
;
2234 cmd
->transport_state
&= ~CMD_T_SENT
;
2235 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2237 transport_stop_tasks_for_cmd(cmd
);
2238 transport_generic_request_failure(cmd
);
2247 static inline u32
transport_get_sectors_6(
2252 struct se_device
*dev
= cmd
->se_dev
;
2255 * Assume TYPE_DISK for non struct se_device objects.
2256 * Use 8-bit sector value.
2262 * Use 24-bit allocation length for TYPE_TAPE.
2264 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2265 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2268 * Everything else assume TYPE_DISK Sector CDB location.
2269 * Use 8-bit sector value. SBC-3 says:
2271 * A TRANSFER LENGTH field set to zero specifies that 256
2272 * logical blocks shall be written. Any other value
2273 * specifies the number of logical blocks that shall be
2277 return cdb
[4] ? : 256;
2280 static inline u32
transport_get_sectors_10(
2285 struct se_device
*dev
= cmd
->se_dev
;
2288 * Assume TYPE_DISK for non struct se_device objects.
2289 * Use 16-bit sector value.
2295 * XXX_10 is not defined in SSC, throw an exception
2297 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2303 * Everything else assume TYPE_DISK Sector CDB location.
2304 * Use 16-bit sector value.
2307 return (u32
)(cdb
[7] << 8) + cdb
[8];
2310 static inline u32
transport_get_sectors_12(
2315 struct se_device
*dev
= cmd
->se_dev
;
2318 * Assume TYPE_DISK for non struct se_device objects.
2319 * Use 32-bit sector value.
2325 * XXX_12 is not defined in SSC, throw an exception
2327 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2333 * Everything else assume TYPE_DISK Sector CDB location.
2334 * Use 32-bit sector value.
2337 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2340 static inline u32
transport_get_sectors_16(
2345 struct se_device
*dev
= cmd
->se_dev
;
2348 * Assume TYPE_DISK for non struct se_device objects.
2349 * Use 32-bit sector value.
2355 * Use 24-bit allocation length for TYPE_TAPE.
2357 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2358 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2361 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2362 (cdb
[12] << 8) + cdb
[13];
2366 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2368 static inline u32
transport_get_sectors_32(
2374 * Assume TYPE_DISK for non struct se_device objects.
2375 * Use 32-bit sector value.
2377 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2378 (cdb
[30] << 8) + cdb
[31];
2382 static inline u32
transport_get_size(
2387 struct se_device
*dev
= cmd
->se_dev
;
2389 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2390 if (cdb
[1] & 1) { /* sectors */
2391 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2396 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2397 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2398 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2399 dev
->transport
->name
);
2401 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2404 static void transport_xor_callback(struct se_cmd
*cmd
)
2406 unsigned char *buf
, *addr
;
2407 struct scatterlist
*sg
;
2408 unsigned int offset
;
2412 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2414 * 1) read the specified logical block(s);
2415 * 2) transfer logical blocks from the data-out buffer;
2416 * 3) XOR the logical blocks transferred from the data-out buffer with
2417 * the logical blocks read, storing the resulting XOR data in a buffer;
2418 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2419 * blocks transferred from the data-out buffer; and
2420 * 5) transfer the resulting XOR data to the data-in buffer.
2422 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2424 pr_err("Unable to allocate xor_callback buf\n");
2428 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2429 * into the locally allocated *buf
2431 sg_copy_to_buffer(cmd
->t_data_sg
,
2437 * Now perform the XOR against the BIDI read memory located at
2438 * cmd->t_mem_bidi_list
2442 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2443 addr
= kmap_atomic(sg_page(sg
));
2447 for (i
= 0; i
< sg
->length
; i
++)
2448 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2450 offset
+= sg
->length
;
2451 kunmap_atomic(addr
);
2459 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2461 static int transport_get_sense_data(struct se_cmd
*cmd
)
2463 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2464 struct se_device
*dev
= cmd
->se_dev
;
2465 struct se_task
*task
= NULL
, *task_tmp
;
2466 unsigned long flags
;
2469 WARN_ON(!cmd
->se_lun
);
2474 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2475 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2476 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2480 list_for_each_entry_safe(task
, task_tmp
,
2481 &cmd
->t_task_list
, t_list
) {
2482 if (!(task
->task_flags
& TF_HAS_SENSE
))
2485 if (!dev
->transport
->get_sense_buffer
) {
2486 pr_err("dev->transport->get_sense_buffer"
2491 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2492 if (!sense_buffer
) {
2493 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2494 " sense buffer for task with sense\n",
2495 cmd
->se_tfo
->get_task_tag(cmd
), task
);
2498 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2500 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2501 TRANSPORT_SENSE_BUFFER
);
2503 memcpy(&buffer
[offset
], sense_buffer
,
2504 TRANSPORT_SENSE_BUFFER
);
2505 cmd
->scsi_status
= task
->task_scsi_status
;
2506 /* Automatically padded */
2507 cmd
->scsi_sense_length
=
2508 (TRANSPORT_SENSE_BUFFER
+ offset
);
2510 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2512 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2516 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2521 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2523 return dev
->transport
->get_blocks(dev
) + 1;
2526 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2528 struct se_device
*dev
= cmd
->se_dev
;
2531 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2534 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2536 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2537 pr_err("LBA: %llu Sectors: %u exceeds"
2538 " transport_dev_end_lba(): %llu\n",
2539 cmd
->t_task_lba
, sectors
,
2540 transport_dev_end_lba(dev
));
2547 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2550 * Determine if the received WRITE_SAME is used to for direct
2551 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2552 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2553 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2555 int passthrough
= (dev
->transport
->transport_type
==
2556 TRANSPORT_PLUGIN_PHBA_PDEV
);
2559 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2560 pr_err("WRITE_SAME PBDATA and LBDATA"
2561 " bits not supported for Block Discard"
2566 * Currently for the emulated case we only accept
2567 * tpws with the UNMAP=1 bit set.
2569 if (!(flags
[0] & 0x08)) {
2570 pr_err("WRITE_SAME w/o UNMAP bit not"
2571 " supported for Block Discard Emulation\n");
2579 /* transport_generic_cmd_sequencer():
2581 * Generic Command Sequencer that should work for most DAS transport
2584 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2587 * FIXME: Need to support other SCSI OPCODES where as well.
2589 static int transport_generic_cmd_sequencer(
2593 struct se_device
*dev
= cmd
->se_dev
;
2594 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2595 int ret
= 0, sector_ret
= 0, passthrough
;
2596 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2600 * Check for an existing UNIT ATTENTION condition
2602 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2603 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2604 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2608 * Check status of Asymmetric Logical Unit Assignment port
2610 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2613 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2614 * The ALUA additional sense code qualifier (ASCQ) is determined
2615 * by the ALUA primary or secondary access state..
2619 pr_debug("[%s]: ALUA TG Port not available,"
2620 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2621 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2623 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2624 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2625 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2628 goto out_invalid_cdb_field
;
2631 * Check status for SPC-3 Persistent Reservations
2633 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2634 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2635 cmd
, cdb
, pr_reg_type
) != 0) {
2636 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2637 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2638 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2639 cmd
->scsi_sense_reason
= TCM_RESERVATION_CONFLICT
;
2643 * This means the CDB is allowed for the SCSI Initiator port
2644 * when said port is *NOT* holding the legacy SPC-2 or
2645 * SPC-3 Persistent Reservation.
2650 * If we operate in passthrough mode we skip most CDB emulation and
2651 * instead hand the commands down to the physical SCSI device.
2654 (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
);
2658 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2660 goto out_unsupported_cdb
;
2661 size
= transport_get_size(sectors
, cdb
, cmd
);
2662 cmd
->t_task_lba
= transport_lba_21(cdb
);
2663 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2666 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2668 goto out_unsupported_cdb
;
2669 size
= transport_get_size(sectors
, cdb
, cmd
);
2670 cmd
->t_task_lba
= transport_lba_32(cdb
);
2671 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2674 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2676 goto out_unsupported_cdb
;
2677 size
= transport_get_size(sectors
, cdb
, cmd
);
2678 cmd
->t_task_lba
= transport_lba_32(cdb
);
2679 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2682 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2684 goto out_unsupported_cdb
;
2685 size
= transport_get_size(sectors
, cdb
, cmd
);
2686 cmd
->t_task_lba
= transport_lba_64(cdb
);
2687 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2690 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2692 goto out_unsupported_cdb
;
2693 size
= transport_get_size(sectors
, cdb
, cmd
);
2694 cmd
->t_task_lba
= transport_lba_21(cdb
);
2695 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2698 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2700 goto out_unsupported_cdb
;
2701 size
= transport_get_size(sectors
, cdb
, cmd
);
2702 cmd
->t_task_lba
= transport_lba_32(cdb
);
2704 cmd
->se_cmd_flags
|= SCF_FUA
;
2705 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2708 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2710 goto out_unsupported_cdb
;
2711 size
= transport_get_size(sectors
, cdb
, cmd
);
2712 cmd
->t_task_lba
= transport_lba_32(cdb
);
2714 cmd
->se_cmd_flags
|= SCF_FUA
;
2715 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2718 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2720 goto out_unsupported_cdb
;
2721 size
= transport_get_size(sectors
, cdb
, cmd
);
2722 cmd
->t_task_lba
= transport_lba_64(cdb
);
2724 cmd
->se_cmd_flags
|= SCF_FUA
;
2725 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2727 case XDWRITEREAD_10
:
2728 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2729 !(cmd
->se_cmd_flags
& SCF_BIDI
))
2730 goto out_invalid_cdb_field
;
2731 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2733 goto out_unsupported_cdb
;
2734 size
= transport_get_size(sectors
, cdb
, cmd
);
2735 cmd
->t_task_lba
= transport_lba_32(cdb
);
2736 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2739 * Do now allow BIDI commands for passthrough mode.
2742 goto out_unsupported_cdb
;
2745 * Setup BIDI XOR callback to be run after I/O completion.
2747 cmd
->transport_complete_callback
= &transport_xor_callback
;
2749 cmd
->se_cmd_flags
|= SCF_FUA
;
2751 case VARIABLE_LENGTH_CMD
:
2752 service_action
= get_unaligned_be16(&cdb
[8]);
2753 switch (service_action
) {
2754 case XDWRITEREAD_32
:
2755 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2757 goto out_unsupported_cdb
;
2758 size
= transport_get_size(sectors
, cdb
, cmd
);
2760 * Use WRITE_32 and READ_32 opcodes for the emulated
2761 * XDWRITE_READ_32 logic.
2763 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2764 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2767 * Do now allow BIDI commands for passthrough mode.
2770 goto out_unsupported_cdb
;
2773 * Setup BIDI XOR callback to be run during after I/O
2776 cmd
->transport_complete_callback
= &transport_xor_callback
;
2778 cmd
->se_cmd_flags
|= SCF_FUA
;
2781 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2783 goto out_unsupported_cdb
;
2786 size
= transport_get_size(1, cdb
, cmd
);
2788 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2790 goto out_invalid_cdb_field
;
2793 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2794 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2796 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2797 goto out_unsupported_cdb
;
2799 cmd
->execute_task
= target_emulate_write_same
;
2802 pr_err("VARIABLE_LENGTH_CMD service action"
2803 " 0x%04x not supported\n", service_action
);
2804 goto out_unsupported_cdb
;
2807 case MAINTENANCE_IN
:
2808 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2809 /* MAINTENANCE_IN from SCC-2 */
2811 * Check for emulated MI_REPORT_TARGET_PGS.
2813 if (cdb
[1] == MI_REPORT_TARGET_PGS
&&
2814 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2816 target_emulate_report_target_port_groups
;
2818 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2819 (cdb
[8] << 8) | cdb
[9];
2821 /* GPCMD_SEND_KEY from multi media commands */
2822 size
= (cdb
[8] << 8) + cdb
[9];
2824 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2828 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2830 case MODE_SELECT_10
:
2831 size
= (cdb
[7] << 8) + cdb
[8];
2832 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2836 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2838 cmd
->execute_task
= target_emulate_modesense
;
2841 size
= (cdb
[7] << 8) + cdb
[8];
2842 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2844 cmd
->execute_task
= target_emulate_modesense
;
2846 case GPCMD_READ_BUFFER_CAPACITY
:
2847 case GPCMD_SEND_OPC
:
2850 size
= (cdb
[7] << 8) + cdb
[8];
2851 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2853 case READ_BLOCK_LIMITS
:
2854 size
= READ_BLOCK_LEN
;
2855 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2857 case GPCMD_GET_CONFIGURATION
:
2858 case GPCMD_READ_FORMAT_CAPACITIES
:
2859 case GPCMD_READ_DISC_INFO
:
2860 case GPCMD_READ_TRACK_RZONE_INFO
:
2861 size
= (cdb
[7] << 8) + cdb
[8];
2862 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2864 case PERSISTENT_RESERVE_IN
:
2865 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2866 cmd
->execute_task
= target_scsi3_emulate_pr_in
;
2867 size
= (cdb
[7] << 8) + cdb
[8];
2868 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2870 case PERSISTENT_RESERVE_OUT
:
2871 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2872 cmd
->execute_task
= target_scsi3_emulate_pr_out
;
2873 size
= (cdb
[7] << 8) + cdb
[8];
2874 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2876 case GPCMD_MECHANISM_STATUS
:
2877 case GPCMD_READ_DVD_STRUCTURE
:
2878 size
= (cdb
[8] << 8) + cdb
[9];
2879 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2882 size
= READ_POSITION_LEN
;
2883 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2885 case MAINTENANCE_OUT
:
2886 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2887 /* MAINTENANCE_OUT from SCC-2
2889 * Check for emulated MO_SET_TARGET_PGS.
2891 if (cdb
[1] == MO_SET_TARGET_PGS
&&
2892 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2894 target_emulate_set_target_port_groups
;
2897 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2898 (cdb
[8] << 8) | cdb
[9];
2900 /* GPCMD_REPORT_KEY from multi media commands */
2901 size
= (cdb
[8] << 8) + cdb
[9];
2903 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2906 size
= (cdb
[3] << 8) + cdb
[4];
2908 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2909 * See spc4r17 section 5.3
2911 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2912 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
2913 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2915 cmd
->execute_task
= target_emulate_inquiry
;
2918 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2919 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2922 size
= READ_CAP_LEN
;
2923 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2925 cmd
->execute_task
= target_emulate_readcapacity
;
2927 case READ_MEDIA_SERIAL_NUMBER
:
2928 case SECURITY_PROTOCOL_IN
:
2929 case SECURITY_PROTOCOL_OUT
:
2930 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2931 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2933 case SERVICE_ACTION_IN
:
2934 switch (cmd
->t_task_cdb
[1] & 0x1f) {
2935 case SAI_READ_CAPACITY_16
:
2938 target_emulate_readcapacity_16
;
2944 pr_err("Unsupported SA: 0x%02x\n",
2945 cmd
->t_task_cdb
[1] & 0x1f);
2946 goto out_invalid_cdb_field
;
2949 case ACCESS_CONTROL_IN
:
2950 case ACCESS_CONTROL_OUT
:
2952 case READ_ATTRIBUTE
:
2953 case RECEIVE_COPY_RESULTS
:
2954 case WRITE_ATTRIBUTE
:
2955 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
2956 (cdb
[12] << 8) | cdb
[13];
2957 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2959 case RECEIVE_DIAGNOSTIC
:
2960 case SEND_DIAGNOSTIC
:
2961 size
= (cdb
[3] << 8) | cdb
[4];
2962 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2964 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2967 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2968 size
= (2336 * sectors
);
2969 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2974 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2978 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2980 cmd
->execute_task
= target_emulate_request_sense
;
2982 case READ_ELEMENT_STATUS
:
2983 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
2984 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2987 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2988 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2993 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2994 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2996 if (cdb
[0] == RESERVE_10
)
2997 size
= (cdb
[7] << 8) | cdb
[8];
2999 size
= cmd
->data_length
;
3002 * Setup the legacy emulated handler for SPC-2 and
3003 * >= SPC-3 compatible reservation handling (CRH=1)
3004 * Otherwise, we assume the underlying SCSI logic is
3005 * is running in SPC_PASSTHROUGH, and wants reservations
3006 * emulation disabled.
3008 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
3009 cmd
->execute_task
= target_scsi2_reservation_reserve
;
3010 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3015 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3016 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3018 if (cdb
[0] == RELEASE_10
)
3019 size
= (cdb
[7] << 8) | cdb
[8];
3021 size
= cmd
->data_length
;
3023 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
3024 cmd
->execute_task
= target_scsi2_reservation_release
;
3025 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3027 case SYNCHRONIZE_CACHE
:
3028 case SYNCHRONIZE_CACHE_16
:
3030 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3032 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3033 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3034 cmd
->t_task_lba
= transport_lba_32(cdb
);
3036 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3037 cmd
->t_task_lba
= transport_lba_64(cdb
);
3040 goto out_unsupported_cdb
;
3042 size
= transport_get_size(sectors
, cdb
, cmd
);
3043 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3049 * Check to ensure that LBA + Range does not exceed past end of
3050 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3052 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
3053 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3054 goto out_invalid_cdb_field
;
3056 cmd
->execute_task
= target_emulate_synchronize_cache
;
3059 size
= get_unaligned_be16(&cdb
[7]);
3060 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3062 cmd
->execute_task
= target_emulate_unmap
;
3065 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3067 goto out_unsupported_cdb
;
3070 size
= transport_get_size(1, cdb
, cmd
);
3072 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3073 goto out_invalid_cdb_field
;
3076 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
3077 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3079 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3080 goto out_unsupported_cdb
;
3082 cmd
->execute_task
= target_emulate_write_same
;
3085 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3087 goto out_unsupported_cdb
;
3090 size
= transport_get_size(1, cdb
, cmd
);
3092 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3093 goto out_invalid_cdb_field
;
3096 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3097 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3099 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3100 * of byte 1 bit 3 UNMAP instead of original reserved field
3102 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3103 goto out_unsupported_cdb
;
3105 cmd
->execute_task
= target_emulate_write_same
;
3107 case ALLOW_MEDIUM_REMOVAL
:
3113 case TEST_UNIT_READY
:
3115 case WRITE_FILEMARKS
:
3116 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3118 cmd
->execute_task
= target_emulate_noop
;
3120 case GPCMD_CLOSE_TRACK
:
3121 case INITIALIZE_ELEMENT_STATUS
:
3122 case GPCMD_LOAD_UNLOAD
:
3123 case GPCMD_SET_SPEED
:
3125 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3128 cmd
->execute_task
= target_report_luns
;
3129 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3131 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3132 * See spc4r17 section 5.3
3134 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3135 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3136 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3139 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3140 " 0x%02x, sending CHECK_CONDITION.\n",
3141 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3142 goto out_unsupported_cdb
;
3145 if (size
!= cmd
->data_length
) {
3146 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3147 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3148 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3149 cmd
->data_length
, size
, cdb
[0]);
3151 cmd
->cmd_spdtl
= size
;
3153 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3154 pr_err("Rejecting underflow/overflow"
3156 goto out_invalid_cdb_field
;
3159 * Reject READ_* or WRITE_* with overflow/underflow for
3160 * type SCF_SCSI_DATA_SG_IO_CDB.
3162 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3163 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3164 " CDB on non 512-byte sector setup subsystem"
3165 " plugin: %s\n", dev
->transport
->name
);
3166 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3167 goto out_invalid_cdb_field
;
3170 if (size
> cmd
->data_length
) {
3171 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3172 cmd
->residual_count
= (size
- cmd
->data_length
);
3174 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3175 cmd
->residual_count
= (cmd
->data_length
- size
);
3177 cmd
->data_length
= size
;
3180 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
&&
3181 sectors
> dev
->se_sub_dev
->se_dev_attrib
.fabric_max_sectors
) {
3182 printk_ratelimited(KERN_ERR
"SCSI OP %02xh with too big sectors %u\n",
3184 goto out_invalid_cdb_field
;
3187 /* reject any command that we don't have a handler for */
3188 if (!(passthrough
|| cmd
->execute_task
||
3189 (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
3190 goto out_unsupported_cdb
;
3192 transport_set_supported_SAM_opcode(cmd
);
3195 out_unsupported_cdb
:
3196 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3197 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3199 out_invalid_cdb_field
:
3200 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3201 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3206 * Called from I/O completion to determine which dormant/delayed
3207 * and ordered cmds need to have their tasks added to the execution queue.
3209 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3211 struct se_device
*dev
= cmd
->se_dev
;
3212 struct se_cmd
*cmd_p
, *cmd_tmp
;
3213 int new_active_tasks
= 0;
3215 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3216 atomic_dec(&dev
->simple_cmds
);
3217 smp_mb__after_atomic_dec();
3218 dev
->dev_cur_ordered_id
++;
3219 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3220 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3221 cmd
->se_ordered_id
);
3222 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3223 dev
->dev_cur_ordered_id
++;
3224 pr_debug("Incremented dev_cur_ordered_id: %u for"
3225 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3226 cmd
->se_ordered_id
);
3227 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3228 atomic_dec(&dev
->dev_ordered_sync
);
3229 smp_mb__after_atomic_dec();
3231 dev
->dev_cur_ordered_id
++;
3232 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3233 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3236 * Process all commands up to the last received
3237 * ORDERED task attribute which requires another blocking
3240 spin_lock(&dev
->delayed_cmd_lock
);
3241 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3242 &dev
->delayed_cmd_list
, se_delayed_node
) {
3244 list_del(&cmd_p
->se_delayed_node
);
3245 spin_unlock(&dev
->delayed_cmd_lock
);
3247 pr_debug("Calling add_tasks() for"
3248 " cmd_p: 0x%02x Task Attr: 0x%02x"
3249 " Dormant -> Active, se_ordered_id: %u\n",
3250 cmd_p
->t_task_cdb
[0],
3251 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3253 transport_add_tasks_from_cmd(cmd_p
);
3256 spin_lock(&dev
->delayed_cmd_lock
);
3257 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3260 spin_unlock(&dev
->delayed_cmd_lock
);
3262 * If new tasks have become active, wake up the transport thread
3263 * to do the processing of the Active tasks.
3265 if (new_active_tasks
!= 0)
3266 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3269 static void transport_complete_qf(struct se_cmd
*cmd
)
3273 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3274 transport_complete_task_attr(cmd
);
3276 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3277 ret
= cmd
->se_tfo
->queue_status(cmd
);
3282 switch (cmd
->data_direction
) {
3283 case DMA_FROM_DEVICE
:
3284 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3287 if (cmd
->t_bidi_data_sg
) {
3288 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3292 /* Fall through for DMA_TO_DEVICE */
3294 ret
= cmd
->se_tfo
->queue_status(cmd
);
3302 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3305 transport_lun_remove_cmd(cmd
);
3306 transport_cmd_check_stop_to_fabric(cmd
);
3309 static void transport_handle_queue_full(
3311 struct se_device
*dev
)
3313 spin_lock_irq(&dev
->qf_cmd_lock
);
3314 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3315 atomic_inc(&dev
->dev_qf_count
);
3316 smp_mb__after_atomic_inc();
3317 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3319 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3322 static void target_complete_ok_work(struct work_struct
*work
)
3324 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3325 int reason
= 0, ret
;
3328 * Check if we need to move delayed/dormant tasks from cmds on the
3329 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3332 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3333 transport_complete_task_attr(cmd
);
3335 * Check to schedule QUEUE_FULL work, or execute an existing
3336 * cmd->transport_qf_callback()
3338 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3339 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3342 * Check if we need to retrieve a sense buffer from
3343 * the struct se_cmd in question.
3345 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3346 if (transport_get_sense_data(cmd
) < 0)
3347 reason
= TCM_NON_EXISTENT_LUN
;
3350 * Only set when an struct se_task->task_scsi_status returned
3351 * a non GOOD status.
3353 if (cmd
->scsi_status
) {
3354 ret
= transport_send_check_condition_and_sense(
3356 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3359 transport_lun_remove_cmd(cmd
);
3360 transport_cmd_check_stop_to_fabric(cmd
);
3365 * Check for a callback, used by amongst other things
3366 * XDWRITE_READ_10 emulation.
3368 if (cmd
->transport_complete_callback
)
3369 cmd
->transport_complete_callback(cmd
);
3371 switch (cmd
->data_direction
) {
3372 case DMA_FROM_DEVICE
:
3373 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3374 if (cmd
->se_lun
->lun_sep
) {
3375 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3378 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3380 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3381 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3385 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3386 if (cmd
->se_lun
->lun_sep
) {
3387 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3390 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3392 * Check if we need to send READ payload for BIDI-COMMAND
3394 if (cmd
->t_bidi_data_sg
) {
3395 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3396 if (cmd
->se_lun
->lun_sep
) {
3397 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3400 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3401 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3402 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3406 /* Fall through for DMA_TO_DEVICE */
3408 ret
= cmd
->se_tfo
->queue_status(cmd
);
3409 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3416 transport_lun_remove_cmd(cmd
);
3417 transport_cmd_check_stop_to_fabric(cmd
);
3421 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3422 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3423 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3424 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3427 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3429 struct se_task
*task
, *task_tmp
;
3430 unsigned long flags
;
3431 LIST_HEAD(dispose_list
);
3433 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3434 list_for_each_entry_safe(task
, task_tmp
,
3435 &cmd
->t_task_list
, t_list
) {
3436 if (!(task
->task_flags
& TF_ACTIVE
))
3437 list_move_tail(&task
->t_list
, &dispose_list
);
3439 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3441 while (!list_empty(&dispose_list
)) {
3442 task
= list_first_entry(&dispose_list
, struct se_task
, t_list
);
3444 if (task
->task_sg
!= cmd
->t_data_sg
&&
3445 task
->task_sg
!= cmd
->t_bidi_data_sg
)
3446 kfree(task
->task_sg
);
3448 list_del(&task
->t_list
);
3450 cmd
->se_dev
->transport
->free_task(task
);
3454 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3456 struct scatterlist
*sg
;
3459 for_each_sg(sgl
, sg
, nents
, count
)
3460 __free_page(sg_page(sg
));
3465 static inline void transport_free_pages(struct se_cmd
*cmd
)
3467 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3470 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3471 cmd
->t_data_sg
= NULL
;
3472 cmd
->t_data_nents
= 0;
3474 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3475 cmd
->t_bidi_data_sg
= NULL
;
3476 cmd
->t_bidi_data_nents
= 0;
3480 * transport_release_cmd - free a command
3481 * @cmd: command to free
3483 * This routine unconditionally frees a command, and reference counting
3484 * or list removal must be done in the caller.
3486 static void transport_release_cmd(struct se_cmd
*cmd
)
3488 BUG_ON(!cmd
->se_tfo
);
3490 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
3491 core_tmr_release_req(cmd
->se_tmr_req
);
3492 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
3493 kfree(cmd
->t_task_cdb
);
3495 * If this cmd has been setup with target_get_sess_cmd(), drop
3496 * the kref and call ->release_cmd() in kref callback.
3498 if (cmd
->check_release
!= 0) {
3499 target_put_sess_cmd(cmd
->se_sess
, cmd
);
3502 cmd
->se_tfo
->release_cmd(cmd
);
3506 * transport_put_cmd - release a reference to a command
3507 * @cmd: command to release
3509 * This routine releases our reference to the command and frees it if possible.
3511 static void transport_put_cmd(struct se_cmd
*cmd
)
3513 unsigned long flags
;
3516 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3517 if (atomic_read(&cmd
->t_fe_count
)) {
3518 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3522 if (atomic_read(&cmd
->t_se_count
)) {
3523 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3527 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
3528 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
3529 transport_all_task_dev_remove_state(cmd
);
3532 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3534 if (free_tasks
!= 0)
3535 transport_free_dev_tasks(cmd
);
3537 transport_free_pages(cmd
);
3538 transport_release_cmd(cmd
);
3541 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3545 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3546 * allocating in the core.
3547 * @cmd: Associated se_cmd descriptor
3548 * @mem: SGL style memory for TCM WRITE / READ
3549 * @sg_mem_num: Number of SGL elements
3550 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3551 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3553 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3556 int transport_generic_map_mem_to_cmd(
3558 struct scatterlist
*sgl
,
3560 struct scatterlist
*sgl_bidi
,
3563 if (!sgl
|| !sgl_count
)
3566 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3567 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3569 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3570 * scatterlists already have been set to follow what the fabric
3571 * passes for the original expected data transfer length.
3573 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3574 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3575 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3576 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3577 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3581 cmd
->t_data_sg
= sgl
;
3582 cmd
->t_data_nents
= sgl_count
;
3584 if (sgl_bidi
&& sgl_bidi_count
) {
3585 cmd
->t_bidi_data_sg
= sgl_bidi
;
3586 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3588 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3593 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3595 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
3597 struct scatterlist
*sg
= cmd
->t_data_sg
;
3598 struct page
**pages
;
3603 * We need to take into account a possible offset here for fabrics like
3604 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3605 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3607 if (!cmd
->t_data_nents
)
3609 else if (cmd
->t_data_nents
== 1)
3610 return kmap(sg_page(sg
)) + sg
->offset
;
3612 /* >1 page. use vmap */
3613 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
3617 /* convert sg[] to pages[] */
3618 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
3619 pages
[i
] = sg_page(sg
);
3622 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
3624 if (!cmd
->t_data_vmap
)
3627 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
3629 EXPORT_SYMBOL(transport_kmap_data_sg
);
3631 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
3633 if (!cmd
->t_data_nents
) {
3635 } else if (cmd
->t_data_nents
== 1) {
3636 kunmap(sg_page(cmd
->t_data_sg
));
3640 vunmap(cmd
->t_data_vmap
);
3641 cmd
->t_data_vmap
= NULL
;
3643 EXPORT_SYMBOL(transport_kunmap_data_sg
);
3646 transport_generic_get_mem(struct se_cmd
*cmd
)
3648 u32 length
= cmd
->data_length
;
3654 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3655 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3656 if (!cmd
->t_data_sg
)
3659 cmd
->t_data_nents
= nents
;
3660 sg_init_table(cmd
->t_data_sg
, nents
);
3662 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
? 0 : __GFP_ZERO
;
3665 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3666 page
= alloc_page(GFP_KERNEL
| zero_flag
);
3670 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3678 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3681 kfree(cmd
->t_data_sg
);
3682 cmd
->t_data_sg
= NULL
;
3686 /* Reduce sectors if they are too long for the device */
3687 static inline sector_t
transport_limit_task_sectors(
3688 struct se_device
*dev
,
3689 unsigned long long lba
,
3692 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3694 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3695 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3696 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3703 * This function can be used by HW target mode drivers to create a linked
3704 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3705 * This is intended to be called during the completion path by TCM Core
3706 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3708 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3710 struct scatterlist
*sg_first
= NULL
;
3711 struct scatterlist
*sg_prev
= NULL
;
3712 int sg_prev_nents
= 0;
3713 struct scatterlist
*sg
;
3714 struct se_task
*task
;
3715 u32 chained_nents
= 0;
3718 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3721 * Walk the struct se_task list and setup scatterlist chains
3722 * for each contiguously allocated struct se_task->task_sg[].
3724 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3729 sg_first
= task
->task_sg
;
3730 chained_nents
= task
->task_sg_nents
;
3732 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3733 chained_nents
+= task
->task_sg_nents
;
3736 * For the padded tasks, use the extra SGL vector allocated
3737 * in transport_allocate_data_tasks() for the sg_prev_nents
3738 * offset into sg_chain() above.
3740 * We do not need the padding for the last task (or a single
3741 * task), but in that case we will never use the sg_prev_nents
3742 * value below which would be incorrect.
3744 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3745 sg_prev
= task
->task_sg
;
3748 * Setup the starting pointer and total t_tasks_sg_linked_no including
3749 * padding SGs for linking and to mark the end.
3751 cmd
->t_tasks_sg_chained
= sg_first
;
3752 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3754 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3755 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3756 cmd
->t_tasks_sg_chained_no
);
3758 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
3759 cmd
->t_tasks_sg_chained_no
, i
) {
3761 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3762 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
3763 if (sg_is_chain(sg
))
3764 pr_debug("SG: %p sg_is_chain=1\n", sg
);
3766 pr_debug("SG: %p sg_is_last=1\n", sg
);
3769 EXPORT_SYMBOL(transport_do_task_sg_chain
);
3772 * Break up cmd into chunks transport can handle
3775 transport_allocate_data_tasks(struct se_cmd
*cmd
,
3776 enum dma_data_direction data_direction
,
3777 struct scatterlist
*cmd_sg
, unsigned int sgl_nents
)
3779 struct se_device
*dev
= cmd
->se_dev
;
3781 unsigned long long lba
;
3782 sector_t sectors
, dev_max_sectors
;
3785 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3788 dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
3789 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
3791 WARN_ON(cmd
->data_length
% sector_size
);
3793 lba
= cmd
->t_task_lba
;
3794 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
3795 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
3798 * If we need just a single task reuse the SG list in the command
3799 * and avoid a lot of work.
3801 if (task_count
== 1) {
3802 struct se_task
*task
;
3803 unsigned long flags
;
3805 task
= transport_generic_get_task(cmd
, data_direction
);
3809 task
->task_sg
= cmd_sg
;
3810 task
->task_sg_nents
= sgl_nents
;
3812 task
->task_lba
= lba
;
3813 task
->task_sectors
= sectors
;
3814 task
->task_size
= task
->task_sectors
* sector_size
;
3816 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3817 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3818 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3823 for (i
= 0; i
< task_count
; i
++) {
3824 struct se_task
*task
;
3825 unsigned int task_size
, task_sg_nents_padded
;
3826 struct scatterlist
*sg
;
3827 unsigned long flags
;
3830 task
= transport_generic_get_task(cmd
, data_direction
);
3834 task
->task_lba
= lba
;
3835 task
->task_sectors
= min(sectors
, dev_max_sectors
);
3836 task
->task_size
= task
->task_sectors
* sector_size
;
3839 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3840 * in order to calculate the number per task SGL entries
3842 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
3844 * Check if the fabric module driver is requesting that all
3845 * struct se_task->task_sg[] be chained together.. If so,
3846 * then allocate an extra padding SG entry for linking and
3847 * marking the end of the chained SGL for every task except
3848 * the last one for (task_count > 1) operation, or skipping
3849 * the extra padding for the (task_count == 1) case.
3851 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
3852 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
3854 task_sg_nents_padded
= task
->task_sg_nents
;
3856 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
3857 task_sg_nents_padded
, GFP_KERNEL
);
3858 if (!task
->task_sg
) {
3859 cmd
->se_dev
->transport
->free_task(task
);
3863 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
3865 task_size
= task
->task_size
;
3867 /* Build new sgl, only up to task_size */
3868 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
3869 if (cmd_sg
->length
> task_size
)
3873 task_size
-= cmd_sg
->length
;
3874 cmd_sg
= sg_next(cmd_sg
);
3877 lba
+= task
->task_sectors
;
3878 sectors
-= task
->task_sectors
;
3880 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3881 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3882 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3889 transport_allocate_control_task(struct se_cmd
*cmd
)
3891 struct se_task
*task
;
3892 unsigned long flags
;
3894 /* Workaround for handling zero-length control CDBs */
3895 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3899 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
3903 task
->task_sg
= cmd
->t_data_sg
;
3904 task
->task_size
= cmd
->data_length
;
3905 task
->task_sg_nents
= cmd
->t_data_nents
;
3907 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3908 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3909 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3911 /* Success! Return number of tasks allocated */
3916 * Allocate any required ressources to execute the command, and either place
3917 * it on the execution queue if possible. For writes we might not have the
3918 * payload yet, thus notify the fabric via a call to ->write_pending instead.
3920 int transport_generic_new_cmd(struct se_cmd
*cmd
)
3922 struct se_device
*dev
= cmd
->se_dev
;
3923 int task_cdbs
, task_cdbs_bidi
= 0;
3928 * Determine is the TCM fabric module has already allocated physical
3929 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3932 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
3934 ret
= transport_generic_get_mem(cmd
);
3940 * For BIDI command set up the read tasks first.
3942 if (cmd
->t_bidi_data_sg
&&
3943 dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
3944 BUG_ON(!(cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
));
3946 task_cdbs_bidi
= transport_allocate_data_tasks(cmd
,
3947 DMA_FROM_DEVICE
, cmd
->t_bidi_data_sg
,
3948 cmd
->t_bidi_data_nents
);
3949 if (task_cdbs_bidi
<= 0)
3952 atomic_inc(&cmd
->t_fe_count
);
3953 atomic_inc(&cmd
->t_se_count
);
3957 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
3958 task_cdbs
= transport_allocate_data_tasks(cmd
,
3959 cmd
->data_direction
, cmd
->t_data_sg
,
3962 task_cdbs
= transport_allocate_control_task(cmd
);
3967 else if (!task_cdbs
&& (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)) {
3968 spin_lock_irq(&cmd
->t_state_lock
);
3969 cmd
->t_state
= TRANSPORT_COMPLETE
;
3970 cmd
->transport_state
|= CMD_T_ACTIVE
;
3971 spin_unlock_irq(&cmd
->t_state_lock
);
3973 if (cmd
->t_task_cdb
[0] == REQUEST_SENSE
) {
3974 u8 ua_asc
= 0, ua_ascq
= 0;
3976 core_scsi3_ua_clear_for_request_sense(cmd
,
3980 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
3981 queue_work(target_completion_wq
, &cmd
->work
);
3986 atomic_inc(&cmd
->t_fe_count
);
3987 atomic_inc(&cmd
->t_se_count
);
3990 cmd
->t_task_list_num
= (task_cdbs
+ task_cdbs_bidi
);
3991 atomic_set(&cmd
->t_task_cdbs_left
, cmd
->t_task_list_num
);
3992 atomic_set(&cmd
->t_task_cdbs_ex_left
, cmd
->t_task_list_num
);
3995 * For WRITEs, let the fabric know its buffer is ready..
3996 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3997 * will be added to the struct se_device execution queue after its WRITE
3998 * data has arrived. (ie: It gets handled by the transport processing
3999 * thread a second time)
4001 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4002 transport_add_tasks_to_state_queue(cmd
);
4003 return transport_generic_write_pending(cmd
);
4006 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4007 * to the execution queue.
4009 transport_execute_tasks(cmd
);
4013 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
4014 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
4017 EXPORT_SYMBOL(transport_generic_new_cmd
);
4019 /* transport_generic_process_write():
4023 void transport_generic_process_write(struct se_cmd
*cmd
)
4025 transport_execute_tasks(cmd
);
4027 EXPORT_SYMBOL(transport_generic_process_write
);
4029 static void transport_write_pending_qf(struct se_cmd
*cmd
)
4033 ret
= cmd
->se_tfo
->write_pending(cmd
);
4034 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
4035 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4037 transport_handle_queue_full(cmd
, cmd
->se_dev
);
4041 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4043 unsigned long flags
;
4046 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4047 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4048 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4051 * Clear the se_cmd for WRITE_PENDING status in order to set
4052 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
4053 * from HW target mode interrupt code. This is safe to be called
4054 * with transport_off=1 before the cmd->se_tfo->write_pending
4055 * because the se_cmd->se_lun pointer is not being cleared.
4057 transport_cmd_check_stop(cmd
, 1, 0);
4060 * Call the fabric write_pending function here to let the
4061 * frontend know that WRITE buffers are ready.
4063 ret
= cmd
->se_tfo
->write_pending(cmd
);
4064 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
4072 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4073 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4074 transport_handle_queue_full(cmd
, cmd
->se_dev
);
4078 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
4080 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
4081 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
4082 transport_wait_for_tasks(cmd
);
4084 transport_release_cmd(cmd
);
4087 transport_wait_for_tasks(cmd
);
4089 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4092 transport_lun_remove_cmd(cmd
);
4094 transport_free_dev_tasks(cmd
);
4096 transport_put_cmd(cmd
);
4099 EXPORT_SYMBOL(transport_generic_free_cmd
);
4101 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
4102 * @se_sess: session to reference
4103 * @se_cmd: command descriptor to add
4104 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
4106 void target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
4109 unsigned long flags
;
4111 kref_init(&se_cmd
->cmd_kref
);
4113 * Add a second kref if the fabric caller is expecting to handle
4114 * fabric acknowledgement that requires two target_put_sess_cmd()
4115 * invocations before se_cmd descriptor release.
4117 if (ack_kref
== true) {
4118 kref_get(&se_cmd
->cmd_kref
);
4119 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
4122 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
4123 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
4124 se_cmd
->check_release
= 1;
4125 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4127 EXPORT_SYMBOL(target_get_sess_cmd
);
4129 static void target_release_cmd_kref(struct kref
*kref
)
4131 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
4132 struct se_session
*se_sess
= se_cmd
->se_sess
;
4133 unsigned long flags
;
4135 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
4136 if (list_empty(&se_cmd
->se_cmd_list
)) {
4137 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4138 se_cmd
->se_tfo
->release_cmd(se_cmd
);
4141 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
4142 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4143 complete(&se_cmd
->cmd_wait_comp
);
4146 list_del(&se_cmd
->se_cmd_list
);
4147 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4149 se_cmd
->se_tfo
->release_cmd(se_cmd
);
4152 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4153 * @se_sess: session to reference
4154 * @se_cmd: command descriptor to drop
4156 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
4158 return kref_put(&se_cmd
->cmd_kref
, target_release_cmd_kref
);
4160 EXPORT_SYMBOL(target_put_sess_cmd
);
4162 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4163 * @se_sess: session to split
4165 void target_splice_sess_cmd_list(struct se_session
*se_sess
)
4167 struct se_cmd
*se_cmd
;
4168 unsigned long flags
;
4170 WARN_ON(!list_empty(&se_sess
->sess_wait_list
));
4171 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
4173 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
4174 se_sess
->sess_tearing_down
= 1;
4176 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
4178 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
4179 se_cmd
->cmd_wait_set
= 1;
4181 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4183 EXPORT_SYMBOL(target_splice_sess_cmd_list
);
4185 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4186 * @se_sess: session to wait for active I/O
4187 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4189 void target_wait_for_sess_cmds(
4190 struct se_session
*se_sess
,
4193 struct se_cmd
*se_cmd
, *tmp_cmd
;
4196 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
4197 &se_sess
->sess_wait_list
, se_cmd_list
) {
4198 list_del(&se_cmd
->se_cmd_list
);
4200 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4201 " %d\n", se_cmd
, se_cmd
->t_state
,
4202 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4204 if (wait_for_tasks
) {
4205 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4206 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4207 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4209 rc
= transport_wait_for_tasks(se_cmd
);
4211 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4212 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4213 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4217 wait_for_completion(&se_cmd
->cmd_wait_comp
);
4218 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4219 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4220 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4223 se_cmd
->se_tfo
->release_cmd(se_cmd
);
4226 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
4228 /* transport_lun_wait_for_tasks():
4230 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4231 * an struct se_lun to be successfully shutdown.
4233 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4235 unsigned long flags
;
4238 * If the frontend has already requested this struct se_cmd to
4239 * be stopped, we can safely ignore this struct se_cmd.
4241 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4242 if (cmd
->transport_state
& CMD_T_STOP
) {
4243 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
4245 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
4246 cmd
->se_tfo
->get_task_tag(cmd
));
4247 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4248 transport_cmd_check_stop(cmd
, 1, 0);
4251 cmd
->transport_state
|= CMD_T_LUN_FE_STOP
;
4252 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4254 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4256 ret
= transport_stop_tasks_for_cmd(cmd
);
4258 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4259 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4261 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4262 cmd
->se_tfo
->get_task_tag(cmd
));
4263 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4264 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4265 cmd
->se_tfo
->get_task_tag(cmd
));
4267 transport_remove_cmd_from_queue(cmd
);
4272 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4274 struct se_cmd
*cmd
= NULL
;
4275 unsigned long lun_flags
, cmd_flags
;
4277 * Do exception processing and return CHECK_CONDITION status to the
4280 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4281 while (!list_empty(&lun
->lun_cmd_list
)) {
4282 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4283 struct se_cmd
, se_lun_node
);
4284 list_del_init(&cmd
->se_lun_node
);
4287 * This will notify iscsi_target_transport.c:
4288 * transport_cmd_check_stop() that a LUN shutdown is in
4289 * progress for the iscsi_cmd_t.
4291 spin_lock(&cmd
->t_state_lock
);
4292 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4293 "_lun_stop for ITT: 0x%08x\n",
4294 cmd
->se_lun
->unpacked_lun
,
4295 cmd
->se_tfo
->get_task_tag(cmd
));
4296 cmd
->transport_state
|= CMD_T_LUN_STOP
;
4297 spin_unlock(&cmd
->t_state_lock
);
4299 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4302 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4303 cmd
->se_tfo
->get_task_tag(cmd
),
4304 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4308 * If the Storage engine still owns the iscsi_cmd_t, determine
4309 * and/or stop its context.
4311 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4312 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4313 cmd
->se_tfo
->get_task_tag(cmd
));
4315 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4316 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4320 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4321 "_wait_for_tasks(): SUCCESS\n",
4322 cmd
->se_lun
->unpacked_lun
,
4323 cmd
->se_tfo
->get_task_tag(cmd
));
4325 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4326 if (!(cmd
->transport_state
& CMD_T_DEV_ACTIVE
)) {
4327 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4330 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
4331 transport_all_task_dev_remove_state(cmd
);
4332 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4334 transport_free_dev_tasks(cmd
);
4336 * The Storage engine stopped this struct se_cmd before it was
4337 * send to the fabric frontend for delivery back to the
4338 * Initiator Node. Return this SCSI CDB back with an
4339 * CHECK_CONDITION status.
4342 transport_send_check_condition_and_sense(cmd
,
4343 TCM_NON_EXISTENT_LUN
, 0);
4345 * If the fabric frontend is waiting for this iscsi_cmd_t to
4346 * be released, notify the waiting thread now that LU has
4347 * finished accessing it.
4349 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4350 if (cmd
->transport_state
& CMD_T_LUN_FE_STOP
) {
4351 pr_debug("SE_LUN[%d] - Detected FE stop for"
4352 " struct se_cmd: %p ITT: 0x%08x\n",
4354 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4356 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4358 transport_cmd_check_stop(cmd
, 1, 0);
4359 complete(&cmd
->transport_lun_fe_stop_comp
);
4360 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4363 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4364 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4366 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4367 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4369 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4372 static int transport_clear_lun_thread(void *p
)
4374 struct se_lun
*lun
= p
;
4376 __transport_clear_lun_from_sessions(lun
);
4377 complete(&lun
->lun_shutdown_comp
);
4382 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4384 struct task_struct
*kt
;
4386 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4387 "tcm_cl_%u", lun
->unpacked_lun
);
4389 pr_err("Unable to start clear_lun thread\n");
4392 wait_for_completion(&lun
->lun_shutdown_comp
);
4398 * transport_wait_for_tasks - wait for completion to occur
4399 * @cmd: command to wait
4401 * Called from frontend fabric context to wait for storage engine
4402 * to pause and/or release frontend generated struct se_cmd.
4404 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
4406 unsigned long flags
;
4408 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4409 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
4410 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
4411 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4415 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4416 * has been set in transport_set_supported_SAM_opcode().
4418 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
4419 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
4420 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4424 * If we are already stopped due to an external event (ie: LUN shutdown)
4425 * sleep until the connection can have the passed struct se_cmd back.
4426 * The cmd->transport_lun_stopped_sem will be upped by
4427 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4428 * has completed its operation on the struct se_cmd.
4430 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
4431 pr_debug("wait_for_tasks: Stopping"
4432 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4433 "_stop_comp); for ITT: 0x%08x\n",
4434 cmd
->se_tfo
->get_task_tag(cmd
));
4436 * There is a special case for WRITES where a FE exception +
4437 * LUN shutdown means ConfigFS context is still sleeping on
4438 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4439 * We go ahead and up transport_lun_stop_comp just to be sure
4442 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4443 complete(&cmd
->transport_lun_stop_comp
);
4444 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4445 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4447 transport_all_task_dev_remove_state(cmd
);
4449 * At this point, the frontend who was the originator of this
4450 * struct se_cmd, now owns the structure and can be released through
4451 * normal means below.
4453 pr_debug("wait_for_tasks: Stopped"
4454 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4455 "stop_comp); for ITT: 0x%08x\n",
4456 cmd
->se_tfo
->get_task_tag(cmd
));
4458 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
4461 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
4462 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4466 cmd
->transport_state
|= CMD_T_STOP
;
4468 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4469 " i_state: %d, t_state: %d, CMD_T_STOP\n",
4470 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4471 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4473 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4475 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4477 wait_for_completion(&cmd
->t_transport_stop_comp
);
4479 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4480 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
4482 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4483 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4484 cmd
->se_tfo
->get_task_tag(cmd
));
4486 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4490 EXPORT_SYMBOL(transport_wait_for_tasks
);
4492 static int transport_get_sense_codes(
4497 *asc
= cmd
->scsi_asc
;
4498 *ascq
= cmd
->scsi_ascq
;
4503 static int transport_set_sense_codes(
4508 cmd
->scsi_asc
= asc
;
4509 cmd
->scsi_ascq
= ascq
;
4514 int transport_send_check_condition_and_sense(
4519 unsigned char *buffer
= cmd
->sense_buffer
;
4520 unsigned long flags
;
4522 u8 asc
= 0, ascq
= 0;
4524 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4525 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4526 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4529 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4530 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4532 if (!reason
&& from_transport
)
4535 if (!from_transport
)
4536 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4538 * Data Segment and SenseLength of the fabric response PDU.
4540 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4541 * from include/scsi/scsi_cmnd.h
4543 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4544 TRANSPORT_SENSE_BUFFER
);
4546 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4547 * SENSE KEY values from include/scsi/scsi.h
4550 case TCM_NON_EXISTENT_LUN
:
4552 buffer
[offset
] = 0x70;
4553 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4554 /* ILLEGAL REQUEST */
4555 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4556 /* LOGICAL UNIT NOT SUPPORTED */
4557 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4559 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4560 case TCM_SECTOR_COUNT_TOO_MANY
:
4562 buffer
[offset
] = 0x70;
4563 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4564 /* ILLEGAL REQUEST */
4565 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4566 /* INVALID COMMAND OPERATION CODE */
4567 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4569 case TCM_UNKNOWN_MODE_PAGE
:
4571 buffer
[offset
] = 0x70;
4572 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4573 /* ILLEGAL REQUEST */
4574 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4575 /* INVALID FIELD IN CDB */
4576 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4578 case TCM_CHECK_CONDITION_ABORT_CMD
:
4580 buffer
[offset
] = 0x70;
4581 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4582 /* ABORTED COMMAND */
4583 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4584 /* BUS DEVICE RESET FUNCTION OCCURRED */
4585 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4586 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4588 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4590 buffer
[offset
] = 0x70;
4591 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4592 /* ABORTED COMMAND */
4593 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4595 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4596 /* NOT ENOUGH UNSOLICITED DATA */
4597 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4599 case TCM_INVALID_CDB_FIELD
:
4601 buffer
[offset
] = 0x70;
4602 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4603 /* ILLEGAL REQUEST */
4604 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4605 /* INVALID FIELD IN CDB */
4606 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4608 case TCM_INVALID_PARAMETER_LIST
:
4610 buffer
[offset
] = 0x70;
4611 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4612 /* ILLEGAL REQUEST */
4613 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4614 /* INVALID FIELD IN PARAMETER LIST */
4615 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4617 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4619 buffer
[offset
] = 0x70;
4620 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4621 /* ABORTED COMMAND */
4622 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4624 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4625 /* UNEXPECTED_UNSOLICITED_DATA */
4626 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4628 case TCM_SERVICE_CRC_ERROR
:
4630 buffer
[offset
] = 0x70;
4631 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4632 /* ABORTED COMMAND */
4633 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4634 /* PROTOCOL SERVICE CRC ERROR */
4635 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4637 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4639 case TCM_SNACK_REJECTED
:
4641 buffer
[offset
] = 0x70;
4642 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4643 /* ABORTED COMMAND */
4644 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4646 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4647 /* FAILED RETRANSMISSION REQUEST */
4648 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4650 case TCM_WRITE_PROTECTED
:
4652 buffer
[offset
] = 0x70;
4653 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4655 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4656 /* WRITE PROTECTED */
4657 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4659 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4661 buffer
[offset
] = 0x70;
4662 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4663 /* UNIT ATTENTION */
4664 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4665 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4666 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4667 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4669 case TCM_CHECK_CONDITION_NOT_READY
:
4671 buffer
[offset
] = 0x70;
4672 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4674 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4675 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4676 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4677 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4679 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4682 buffer
[offset
] = 0x70;
4683 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4684 /* ILLEGAL REQUEST */
4685 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4686 /* LOGICAL UNIT COMMUNICATION FAILURE */
4687 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4691 * This code uses linux/include/scsi/scsi.h SAM status codes!
4693 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4695 * Automatically padded, this value is encoded in the fabric's
4696 * data_length response PDU containing the SCSI defined sense data.
4698 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4701 return cmd
->se_tfo
->queue_status(cmd
);
4703 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4705 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4709 if (cmd
->transport_state
& CMD_T_ABORTED
) {
4711 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4714 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4715 " status for CDB: 0x%02x ITT: 0x%08x\n",
4717 cmd
->se_tfo
->get_task_tag(cmd
));
4719 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4720 cmd
->se_tfo
->queue_status(cmd
);
4725 EXPORT_SYMBOL(transport_check_aborted_status
);
4727 void transport_send_task_abort(struct se_cmd
*cmd
)
4729 unsigned long flags
;
4731 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4732 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4733 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4736 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4739 * If there are still expected incoming fabric WRITEs, we wait
4740 * until until they have completed before sending a TASK_ABORTED
4741 * response. This response with TASK_ABORTED status will be
4742 * queued back to fabric module by transport_check_aborted_status().
4744 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4745 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4746 cmd
->transport_state
|= CMD_T_ABORTED
;
4747 smp_mb__after_atomic_inc();
4750 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4752 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4753 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4754 cmd
->se_tfo
->get_task_tag(cmd
));
4756 cmd
->se_tfo
->queue_status(cmd
);
4759 static int transport_generic_do_tmr(struct se_cmd
*cmd
)
4761 struct se_device
*dev
= cmd
->se_dev
;
4762 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4765 switch (tmr
->function
) {
4766 case TMR_ABORT_TASK
:
4767 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
4769 case TMR_ABORT_TASK_SET
:
4771 case TMR_CLEAR_TASK_SET
:
4772 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4775 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4776 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4777 TMR_FUNCTION_REJECTED
;
4779 case TMR_TARGET_WARM_RESET
:
4780 tmr
->response
= TMR_FUNCTION_REJECTED
;
4782 case TMR_TARGET_COLD_RESET
:
4783 tmr
->response
= TMR_FUNCTION_REJECTED
;
4786 pr_err("Uknown TMR function: 0x%02x.\n",
4788 tmr
->response
= TMR_FUNCTION_REJECTED
;
4792 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4793 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4795 transport_cmd_check_stop_to_fabric(cmd
);
4799 /* transport_processing_thread():
4803 static int transport_processing_thread(void *param
)
4807 struct se_device
*dev
= param
;
4809 while (!kthread_should_stop()) {
4810 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4811 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4812 kthread_should_stop());
4817 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4821 switch (cmd
->t_state
) {
4822 case TRANSPORT_NEW_CMD
:
4825 case TRANSPORT_NEW_CMD_MAP
:
4826 if (!cmd
->se_tfo
->new_cmd_map
) {
4827 pr_err("cmd->se_tfo->new_cmd_map is"
4828 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4831 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4833 transport_generic_request_failure(cmd
);
4836 ret
= transport_generic_new_cmd(cmd
);
4838 transport_generic_request_failure(cmd
);
4842 case TRANSPORT_PROCESS_WRITE
:
4843 transport_generic_process_write(cmd
);
4845 case TRANSPORT_PROCESS_TMR
:
4846 transport_generic_do_tmr(cmd
);
4848 case TRANSPORT_COMPLETE_QF_WP
:
4849 transport_write_pending_qf(cmd
);
4851 case TRANSPORT_COMPLETE_QF_OK
:
4852 transport_complete_qf(cmd
);
4855 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4856 "i_state: %d on SE LUN: %u\n",
4858 cmd
->se_tfo
->get_task_tag(cmd
),
4859 cmd
->se_tfo
->get_cmd_state(cmd
),
4860 cmd
->se_lun
->unpacked_lun
);
4868 WARN_ON(!list_empty(&dev
->state_task_list
));
4869 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4870 dev
->process_thread
= NULL
;