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 <asm/unaligned.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_cmnd.h>
45 #include <scsi/scsi_tcq.h>
47 #include <target/target_core_base.h>
48 #include <target/target_core_backend.h>
49 #include <target/target_core_fabric.h>
50 #include <target/target_core_configfs.h>
52 #include "target_core_internal.h"
53 #include "target_core_alua.h"
54 #include "target_core_pr.h"
55 #include "target_core_ua.h"
57 static int sub_api_initialized
;
59 static struct workqueue_struct
*target_completion_wq
;
60 static struct kmem_cache
*se_sess_cache
;
61 struct kmem_cache
*se_tmr_req_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 transport_generic_request_failure(struct se_cmd
*);
81 static void target_complete_ok_work(struct work_struct
*work
);
83 int init_se_kmem_caches(void)
85 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
86 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
88 if (!se_tmr_req_cache
) {
89 pr_err("kmem_cache_create() for struct se_tmr_req"
93 se_sess_cache
= kmem_cache_create("se_sess_cache",
94 sizeof(struct se_session
), __alignof__(struct se_session
),
97 pr_err("kmem_cache_create() for struct se_session"
99 goto out_free_tmr_req_cache
;
101 se_ua_cache
= kmem_cache_create("se_ua_cache",
102 sizeof(struct se_ua
), __alignof__(struct se_ua
),
105 pr_err("kmem_cache_create() for struct se_ua failed\n");
106 goto out_free_sess_cache
;
108 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
109 sizeof(struct t10_pr_registration
),
110 __alignof__(struct t10_pr_registration
), 0, NULL
);
111 if (!t10_pr_reg_cache
) {
112 pr_err("kmem_cache_create() for struct t10_pr_registration"
114 goto out_free_ua_cache
;
116 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
117 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
119 if (!t10_alua_lu_gp_cache
) {
120 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
122 goto out_free_pr_reg_cache
;
124 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
125 sizeof(struct t10_alua_lu_gp_member
),
126 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
127 if (!t10_alua_lu_gp_mem_cache
) {
128 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
130 goto out_free_lu_gp_cache
;
132 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
133 sizeof(struct t10_alua_tg_pt_gp
),
134 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
135 if (!t10_alua_tg_pt_gp_cache
) {
136 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
138 goto out_free_lu_gp_mem_cache
;
140 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
141 "t10_alua_tg_pt_gp_mem_cache",
142 sizeof(struct t10_alua_tg_pt_gp_member
),
143 __alignof__(struct t10_alua_tg_pt_gp_member
),
145 if (!t10_alua_tg_pt_gp_mem_cache
) {
146 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
148 goto out_free_tg_pt_gp_cache
;
151 target_completion_wq
= alloc_workqueue("target_completion",
153 if (!target_completion_wq
)
154 goto out_free_tg_pt_gp_mem_cache
;
158 out_free_tg_pt_gp_mem_cache
:
159 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
160 out_free_tg_pt_gp_cache
:
161 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
162 out_free_lu_gp_mem_cache
:
163 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
164 out_free_lu_gp_cache
:
165 kmem_cache_destroy(t10_alua_lu_gp_cache
);
166 out_free_pr_reg_cache
:
167 kmem_cache_destroy(t10_pr_reg_cache
);
169 kmem_cache_destroy(se_ua_cache
);
171 kmem_cache_destroy(se_sess_cache
);
172 out_free_tmr_req_cache
:
173 kmem_cache_destroy(se_tmr_req_cache
);
178 void release_se_kmem_caches(void)
180 destroy_workqueue(target_completion_wq
);
181 kmem_cache_destroy(se_tmr_req_cache
);
182 kmem_cache_destroy(se_sess_cache
);
183 kmem_cache_destroy(se_ua_cache
);
184 kmem_cache_destroy(t10_pr_reg_cache
);
185 kmem_cache_destroy(t10_alua_lu_gp_cache
);
186 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
187 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
188 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
191 /* This code ensures unique mib indexes are handed out. */
192 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
193 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
196 * Allocate a new row index for the entry type specified
198 u32
scsi_get_new_index(scsi_index_t type
)
202 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
204 spin_lock(&scsi_mib_index_lock
);
205 new_index
= ++scsi_mib_index
[type
];
206 spin_unlock(&scsi_mib_index_lock
);
211 static void transport_init_queue_obj(struct se_queue_obj
*qobj
)
213 atomic_set(&qobj
->queue_cnt
, 0);
214 INIT_LIST_HEAD(&qobj
->qobj_list
);
215 init_waitqueue_head(&qobj
->thread_wq
);
216 spin_lock_init(&qobj
->cmd_queue_lock
);
219 void transport_subsystem_check_init(void)
223 if (sub_api_initialized
)
226 ret
= request_module("target_core_iblock");
228 pr_err("Unable to load target_core_iblock\n");
230 ret
= request_module("target_core_file");
232 pr_err("Unable to load target_core_file\n");
234 ret
= request_module("target_core_pscsi");
236 pr_err("Unable to load target_core_pscsi\n");
238 ret
= request_module("target_core_stgt");
240 pr_err("Unable to load target_core_stgt\n");
242 sub_api_initialized
= 1;
246 struct se_session
*transport_init_session(void)
248 struct se_session
*se_sess
;
250 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
252 pr_err("Unable to allocate struct se_session from"
254 return ERR_PTR(-ENOMEM
);
256 INIT_LIST_HEAD(&se_sess
->sess_list
);
257 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
258 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
259 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
260 spin_lock_init(&se_sess
->sess_cmd_lock
);
264 EXPORT_SYMBOL(transport_init_session
);
267 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
269 void __transport_register_session(
270 struct se_portal_group
*se_tpg
,
271 struct se_node_acl
*se_nacl
,
272 struct se_session
*se_sess
,
273 void *fabric_sess_ptr
)
275 unsigned char buf
[PR_REG_ISID_LEN
];
277 se_sess
->se_tpg
= se_tpg
;
278 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
280 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
282 * Only set for struct se_session's that will actually be moving I/O.
283 * eg: *NOT* discovery sessions.
287 * If the fabric module supports an ISID based TransportID,
288 * save this value in binary from the fabric I_T Nexus now.
290 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
291 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
292 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
293 &buf
[0], PR_REG_ISID_LEN
);
294 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
296 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
298 * The se_nacl->nacl_sess pointer will be set to the
299 * last active I_T Nexus for each struct se_node_acl.
301 se_nacl
->nacl_sess
= se_sess
;
303 list_add_tail(&se_sess
->sess_acl_list
,
304 &se_nacl
->acl_sess_list
);
305 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
307 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
309 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
310 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
312 EXPORT_SYMBOL(__transport_register_session
);
314 void transport_register_session(
315 struct se_portal_group
*se_tpg
,
316 struct se_node_acl
*se_nacl
,
317 struct se_session
*se_sess
,
318 void *fabric_sess_ptr
)
320 spin_lock_bh(&se_tpg
->session_lock
);
321 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
322 spin_unlock_bh(&se_tpg
->session_lock
);
324 EXPORT_SYMBOL(transport_register_session
);
326 void transport_deregister_session_configfs(struct se_session
*se_sess
)
328 struct se_node_acl
*se_nacl
;
331 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
333 se_nacl
= se_sess
->se_node_acl
;
335 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
336 list_del(&se_sess
->sess_acl_list
);
338 * If the session list is empty, then clear the pointer.
339 * Otherwise, set the struct se_session pointer from the tail
340 * element of the per struct se_node_acl active session list.
342 if (list_empty(&se_nacl
->acl_sess_list
))
343 se_nacl
->nacl_sess
= NULL
;
345 se_nacl
->nacl_sess
= container_of(
346 se_nacl
->acl_sess_list
.prev
,
347 struct se_session
, sess_acl_list
);
349 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
352 EXPORT_SYMBOL(transport_deregister_session_configfs
);
354 void transport_free_session(struct se_session
*se_sess
)
356 kmem_cache_free(se_sess_cache
, se_sess
);
358 EXPORT_SYMBOL(transport_free_session
);
360 void transport_deregister_session(struct se_session
*se_sess
)
362 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
363 struct se_node_acl
*se_nacl
;
367 transport_free_session(se_sess
);
371 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
372 list_del(&se_sess
->sess_list
);
373 se_sess
->se_tpg
= NULL
;
374 se_sess
->fabric_sess_ptr
= NULL
;
375 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
378 * Determine if we need to do extra work for this initiator node's
379 * struct se_node_acl if it had been previously dynamically generated.
381 se_nacl
= se_sess
->se_node_acl
;
383 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
384 if (se_nacl
->dynamic_node_acl
) {
385 if (!se_tpg
->se_tpg_tfo
->tpg_check_demo_mode_cache(
387 list_del(&se_nacl
->acl_list
);
388 se_tpg
->num_node_acls
--;
389 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
391 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
392 core_free_device_list_for_node(se_nacl
, se_tpg
);
393 se_tpg
->se_tpg_tfo
->tpg_release_fabric_acl(se_tpg
,
395 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
398 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
401 transport_free_session(se_sess
);
403 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
404 se_tpg
->se_tpg_tfo
->get_fabric_name());
406 EXPORT_SYMBOL(transport_deregister_session
);
409 * Called with cmd->t_state_lock held.
411 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
413 struct se_device
*dev
= cmd
->se_dev
;
414 struct se_task
*task
;
420 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
421 if (task
->task_flags
& TF_ACTIVE
)
424 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
425 if (task
->t_state_active
) {
426 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
427 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
429 list_del(&task
->t_state_list
);
430 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
431 task
->t_state_active
= false;
433 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
438 /* transport_cmd_check_stop():
440 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
441 * 'transport_off = 2' determines if task_dev_state should be removed.
443 * A non-zero u8 t_state sets cmd->t_state.
444 * Returns 1 when command is stopped, else 0.
446 static int transport_cmd_check_stop(
453 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
455 * Determine if IOCTL context caller in requesting the stopping of this
456 * command for LUN shutdown purposes.
458 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
459 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
460 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
462 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
463 if (transport_off
== 2)
464 transport_all_task_dev_remove_state(cmd
);
465 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
467 complete(&cmd
->transport_lun_stop_comp
);
471 * Determine if frontend context caller is requesting the stopping of
472 * this command for frontend exceptions.
474 if (cmd
->transport_state
& CMD_T_STOP
) {
475 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
477 cmd
->se_tfo
->get_task_tag(cmd
));
479 if (transport_off
== 2)
480 transport_all_task_dev_remove_state(cmd
);
483 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
486 if (transport_off
== 2)
488 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
490 complete(&cmd
->t_transport_stop_comp
);
494 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
495 if (transport_off
== 2) {
496 transport_all_task_dev_remove_state(cmd
);
498 * Clear struct se_cmd->se_lun before the transport_off == 2
499 * handoff to fabric module.
503 * Some fabric modules like tcm_loop can release
504 * their internally allocated I/O reference now and
507 * Fabric modules are expected to return '1' here if the
508 * se_cmd being passed is released at this point,
509 * or zero if not being released.
511 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
512 spin_unlock_irqrestore(
513 &cmd
->t_state_lock
, flags
);
515 return cmd
->se_tfo
->check_stop_free(cmd
);
518 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
522 cmd
->t_state
= t_state
;
523 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
528 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
530 return transport_cmd_check_stop(cmd
, 2, 0);
533 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
535 struct se_lun
*lun
= cmd
->se_lun
;
541 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
542 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
543 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
544 transport_all_task_dev_remove_state(cmd
);
546 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
548 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
549 if (!list_empty(&cmd
->se_lun_node
))
550 list_del_init(&cmd
->se_lun_node
);
551 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
554 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
556 if (!cmd
->se_tmr_req
)
557 transport_lun_remove_cmd(cmd
);
559 if (transport_cmd_check_stop_to_fabric(cmd
))
562 transport_remove_cmd_from_queue(cmd
);
563 transport_put_cmd(cmd
);
567 static void transport_add_cmd_to_queue(struct se_cmd
*cmd
, int t_state
,
570 struct se_device
*dev
= cmd
->se_dev
;
571 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
575 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
576 cmd
->t_state
= t_state
;
577 cmd
->transport_state
|= CMD_T_ACTIVE
;
578 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
581 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
583 /* If the cmd is already on the list, remove it before we add it */
584 if (!list_empty(&cmd
->se_queue_node
))
585 list_del(&cmd
->se_queue_node
);
587 atomic_inc(&qobj
->queue_cnt
);
590 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
592 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
593 cmd
->transport_state
|= CMD_T_QUEUED
;
594 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
596 wake_up_interruptible(&qobj
->thread_wq
);
599 static struct se_cmd
*
600 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
605 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
606 if (list_empty(&qobj
->qobj_list
)) {
607 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
610 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
612 cmd
->transport_state
&= ~CMD_T_QUEUED
;
613 list_del_init(&cmd
->se_queue_node
);
614 atomic_dec(&qobj
->queue_cnt
);
615 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
620 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
)
622 struct se_queue_obj
*qobj
= &cmd
->se_dev
->dev_queue_obj
;
625 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
626 if (!(cmd
->transport_state
& CMD_T_QUEUED
)) {
627 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
630 cmd
->transport_state
&= ~CMD_T_QUEUED
;
631 atomic_dec(&qobj
->queue_cnt
);
632 list_del_init(&cmd
->se_queue_node
);
633 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
637 * Completion function used by TCM subsystem plugins (such as FILEIO)
638 * for queueing up response from struct se_subsystem_api->do_task()
640 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
642 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
643 struct se_task
, t_list
);
646 cmd
->scsi_status
= SAM_STAT_GOOD
;
647 task
->task_scsi_status
= GOOD
;
649 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
650 task
->task_se_cmd
->scsi_sense_reason
=
651 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
655 transport_complete_task(task
, good
);
657 EXPORT_SYMBOL(transport_complete_sync_cache
);
659 static void target_complete_failure_work(struct work_struct
*work
)
661 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
663 transport_generic_request_failure(cmd
);
666 /* transport_complete_task():
668 * Called from interrupt and non interrupt context depending
669 * on the transport plugin.
671 void transport_complete_task(struct se_task
*task
, int success
)
673 struct se_cmd
*cmd
= task
->task_se_cmd
;
674 struct se_device
*dev
= cmd
->se_dev
;
677 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
678 task
->task_flags
&= ~TF_ACTIVE
;
681 * See if any sense data exists, if so set the TASK_SENSE flag.
682 * Also check for any other post completion work that needs to be
683 * done by the plugins.
685 if (dev
&& dev
->transport
->transport_complete
) {
686 if (dev
->transport
->transport_complete(task
) != 0) {
687 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
688 task
->task_flags
|= TF_HAS_SENSE
;
694 * See if we are waiting for outstanding struct se_task
695 * to complete for an exception condition
697 if (task
->task_flags
& TF_REQUEST_STOP
) {
698 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
699 complete(&task
->task_stop_comp
);
704 cmd
->transport_state
|= CMD_T_FAILED
;
707 * Decrement the outstanding t_task_cdbs_left count. The last
708 * struct se_task from struct se_cmd will complete itself into the
709 * device queue depending upon int success.
711 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
712 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
716 if (cmd
->transport_state
& CMD_T_FAILED
) {
717 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
718 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
720 cmd
->transport_state
|= CMD_T_COMPLETE
;
721 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
724 cmd
->t_state
= TRANSPORT_COMPLETE
;
725 cmd
->transport_state
|= CMD_T_ACTIVE
;
726 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
728 queue_work(target_completion_wq
, &cmd
->work
);
730 EXPORT_SYMBOL(transport_complete_task
);
733 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
734 * struct se_task list are ready to be added to the active execution list
737 * Called with se_dev_t->execute_task_lock called.
739 static inline int transport_add_task_check_sam_attr(
740 struct se_task
*task
,
741 struct se_task
*task_prev
,
742 struct se_device
*dev
)
745 * No SAM Task attribute emulation enabled, add to tail of
748 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
749 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
753 * HEAD_OF_QUEUE attribute for received CDB, which means
754 * the first task that is associated with a struct se_cmd goes to
755 * head of the struct se_device->execute_task_list, and task_prev
756 * after that for each subsequent task
758 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
759 list_add(&task
->t_execute_list
,
760 (task_prev
!= NULL
) ?
761 &task_prev
->t_execute_list
:
762 &dev
->execute_task_list
);
764 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
765 " in execution queue\n",
766 task
->task_se_cmd
->t_task_cdb
[0]);
770 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
771 * transitioned from Dermant -> Active state, and are added to the end
772 * of the struct se_device->execute_task_list
774 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
778 /* __transport_add_task_to_execute_queue():
780 * Called with se_dev_t->execute_task_lock called.
782 static void __transport_add_task_to_execute_queue(
783 struct se_task
*task
,
784 struct se_task
*task_prev
,
785 struct se_device
*dev
)
789 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
790 atomic_inc(&dev
->execute_tasks
);
792 if (task
->t_state_active
)
795 * Determine if this task needs to go to HEAD_OF_QUEUE for the
796 * state list as well. Running with SAM Task Attribute emulation
797 * will always return head_of_queue == 0 here
800 list_add(&task
->t_state_list
, (task_prev
) ?
801 &task_prev
->t_state_list
:
802 &dev
->state_task_list
);
804 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
806 task
->t_state_active
= true;
808 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
809 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
813 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
815 struct se_device
*dev
= cmd
->se_dev
;
816 struct se_task
*task
;
819 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
820 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
821 spin_lock(&dev
->execute_task_lock
);
822 if (!task
->t_state_active
) {
823 list_add_tail(&task
->t_state_list
,
824 &dev
->state_task_list
);
825 task
->t_state_active
= true;
827 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
828 task
->task_se_cmd
->se_tfo
->get_task_tag(
829 task
->task_se_cmd
), task
, dev
);
831 spin_unlock(&dev
->execute_task_lock
);
833 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
836 static void __transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
838 struct se_device
*dev
= cmd
->se_dev
;
839 struct se_task
*task
, *task_prev
= NULL
;
841 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
842 if (!list_empty(&task
->t_execute_list
))
845 * __transport_add_task_to_execute_queue() handles the
846 * SAM Task Attribute emulation if enabled
848 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
853 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
856 struct se_device
*dev
= cmd
->se_dev
;
858 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
859 __transport_add_tasks_from_cmd(cmd
);
860 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
863 void __transport_remove_task_from_execute_queue(struct se_task
*task
,
864 struct se_device
*dev
)
866 list_del_init(&task
->t_execute_list
);
867 atomic_dec(&dev
->execute_tasks
);
870 static void transport_remove_task_from_execute_queue(
871 struct se_task
*task
,
872 struct se_device
*dev
)
876 if (WARN_ON(list_empty(&task
->t_execute_list
)))
879 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
880 __transport_remove_task_from_execute_queue(task
, dev
);
881 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
885 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
888 static void target_qf_do_work(struct work_struct
*work
)
890 struct se_device
*dev
= container_of(work
, struct se_device
,
892 LIST_HEAD(qf_cmd_list
);
893 struct se_cmd
*cmd
, *cmd_tmp
;
895 spin_lock_irq(&dev
->qf_cmd_lock
);
896 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
897 spin_unlock_irq(&dev
->qf_cmd_lock
);
899 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
900 list_del(&cmd
->se_qf_node
);
901 atomic_dec(&dev
->dev_qf_count
);
902 smp_mb__after_atomic_dec();
904 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
905 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
906 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
907 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
910 transport_add_cmd_to_queue(cmd
, cmd
->t_state
, true);
914 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
916 switch (cmd
->data_direction
) {
919 case DMA_FROM_DEVICE
:
923 case DMA_BIDIRECTIONAL
:
932 void transport_dump_dev_state(
933 struct se_device
*dev
,
937 *bl
+= sprintf(b
+ *bl
, "Status: ");
938 switch (dev
->dev_status
) {
939 case TRANSPORT_DEVICE_ACTIVATED
:
940 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
942 case TRANSPORT_DEVICE_DEACTIVATED
:
943 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
945 case TRANSPORT_DEVICE_SHUTDOWN
:
946 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
948 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
949 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
950 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
953 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
957 *bl
+= sprintf(b
+ *bl
, " Execute/Max Queue Depth: %d/%d",
958 atomic_read(&dev
->execute_tasks
), dev
->queue_depth
);
959 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
960 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
961 *bl
+= sprintf(b
+ *bl
, " ");
964 void transport_dump_vpd_proto_id(
966 unsigned char *p_buf
,
969 unsigned char buf
[VPD_TMP_BUF_SIZE
];
972 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
973 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
975 switch (vpd
->protocol_identifier
) {
977 sprintf(buf
+len
, "Fibre Channel\n");
980 sprintf(buf
+len
, "Parallel SCSI\n");
983 sprintf(buf
+len
, "SSA\n");
986 sprintf(buf
+len
, "IEEE 1394\n");
989 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
993 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
996 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
999 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1003 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1006 sprintf(buf
+len
, "Unknown 0x%02x\n",
1007 vpd
->protocol_identifier
);
1012 strncpy(p_buf
, buf
, p_buf_len
);
1014 pr_debug("%s", buf
);
1018 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1021 * Check if the Protocol Identifier Valid (PIV) bit is set..
1023 * from spc3r23.pdf section 7.5.1
1025 if (page_83
[1] & 0x80) {
1026 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1027 vpd
->protocol_identifier_set
= 1;
1028 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1031 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1033 int transport_dump_vpd_assoc(
1034 struct t10_vpd
*vpd
,
1035 unsigned char *p_buf
,
1038 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1042 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1043 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1045 switch (vpd
->association
) {
1047 sprintf(buf
+len
, "addressed logical unit\n");
1050 sprintf(buf
+len
, "target port\n");
1053 sprintf(buf
+len
, "SCSI target device\n");
1056 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1062 strncpy(p_buf
, buf
, p_buf_len
);
1064 pr_debug("%s", buf
);
1069 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1072 * The VPD identification association..
1074 * from spc3r23.pdf Section 7.6.3.1 Table 297
1076 vpd
->association
= (page_83
[1] & 0x30);
1077 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1079 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1081 int transport_dump_vpd_ident_type(
1082 struct t10_vpd
*vpd
,
1083 unsigned char *p_buf
,
1086 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1090 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1091 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1093 switch (vpd
->device_identifier_type
) {
1095 sprintf(buf
+len
, "Vendor specific\n");
1098 sprintf(buf
+len
, "T10 Vendor ID based\n");
1101 sprintf(buf
+len
, "EUI-64 based\n");
1104 sprintf(buf
+len
, "NAA\n");
1107 sprintf(buf
+len
, "Relative target port identifier\n");
1110 sprintf(buf
+len
, "SCSI name string\n");
1113 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1114 vpd
->device_identifier_type
);
1120 if (p_buf_len
< strlen(buf
)+1)
1122 strncpy(p_buf
, buf
, p_buf_len
);
1124 pr_debug("%s", buf
);
1130 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1133 * The VPD identifier type..
1135 * from spc3r23.pdf Section 7.6.3.1 Table 298
1137 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1138 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1140 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1142 int transport_dump_vpd_ident(
1143 struct t10_vpd
*vpd
,
1144 unsigned char *p_buf
,
1147 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1150 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1152 switch (vpd
->device_identifier_code_set
) {
1153 case 0x01: /* Binary */
1154 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1155 &vpd
->device_identifier
[0]);
1157 case 0x02: /* ASCII */
1158 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1159 &vpd
->device_identifier
[0]);
1161 case 0x03: /* UTF-8 */
1162 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1163 &vpd
->device_identifier
[0]);
1166 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1167 " 0x%02x", vpd
->device_identifier_code_set
);
1173 strncpy(p_buf
, buf
, p_buf_len
);
1175 pr_debug("%s", buf
);
1181 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1183 static const char hex_str
[] = "0123456789abcdef";
1184 int j
= 0, i
= 4; /* offset to start of the identifer */
1187 * The VPD Code Set (encoding)
1189 * from spc3r23.pdf Section 7.6.3.1 Table 296
1191 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1192 switch (vpd
->device_identifier_code_set
) {
1193 case 0x01: /* Binary */
1194 vpd
->device_identifier
[j
++] =
1195 hex_str
[vpd
->device_identifier_type
];
1196 while (i
< (4 + page_83
[3])) {
1197 vpd
->device_identifier
[j
++] =
1198 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1199 vpd
->device_identifier
[j
++] =
1200 hex_str
[page_83
[i
] & 0x0f];
1204 case 0x02: /* ASCII */
1205 case 0x03: /* UTF-8 */
1206 while (i
< (4 + page_83
[3]))
1207 vpd
->device_identifier
[j
++] = page_83
[i
++];
1213 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1215 EXPORT_SYMBOL(transport_set_vpd_ident
);
1217 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1220 * If this device is from Target_Core_Mod/pSCSI, disable the
1221 * SAM Task Attribute emulation.
1223 * This is currently not available in upsream Linux/SCSI Target
1224 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1226 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1227 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1231 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1232 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1233 " device\n", dev
->transport
->name
,
1234 dev
->transport
->get_device_rev(dev
));
1237 static void scsi_dump_inquiry(struct se_device
*dev
)
1239 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1243 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1245 for (i
= 0; i
< 8; i
++)
1246 if (wwn
->vendor
[i
] >= 0x20)
1247 buf
[i
] = wwn
->vendor
[i
];
1251 pr_debug(" Vendor: %s\n", buf
);
1253 for (i
= 0; i
< 16; i
++)
1254 if (wwn
->model
[i
] >= 0x20)
1255 buf
[i
] = wwn
->model
[i
];
1259 pr_debug(" Model: %s\n", buf
);
1261 for (i
= 0; i
< 4; i
++)
1262 if (wwn
->revision
[i
] >= 0x20)
1263 buf
[i
] = wwn
->revision
[i
];
1267 pr_debug(" Revision: %s\n", buf
);
1269 device_type
= dev
->transport
->get_device_type(dev
);
1270 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1271 pr_debug(" ANSI SCSI revision: %02x\n",
1272 dev
->transport
->get_device_rev(dev
));
1275 struct se_device
*transport_add_device_to_core_hba(
1277 struct se_subsystem_api
*transport
,
1278 struct se_subsystem_dev
*se_dev
,
1280 void *transport_dev
,
1281 struct se_dev_limits
*dev_limits
,
1282 const char *inquiry_prod
,
1283 const char *inquiry_rev
)
1286 struct se_device
*dev
;
1288 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1290 pr_err("Unable to allocate memory for se_dev_t\n");
1294 transport_init_queue_obj(&dev
->dev_queue_obj
);
1295 dev
->dev_flags
= device_flags
;
1296 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1297 dev
->dev_ptr
= transport_dev
;
1299 dev
->se_sub_dev
= se_dev
;
1300 dev
->transport
= transport
;
1301 INIT_LIST_HEAD(&dev
->dev_list
);
1302 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1303 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1304 INIT_LIST_HEAD(&dev
->execute_task_list
);
1305 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1306 INIT_LIST_HEAD(&dev
->state_task_list
);
1307 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1308 spin_lock_init(&dev
->execute_task_lock
);
1309 spin_lock_init(&dev
->delayed_cmd_lock
);
1310 spin_lock_init(&dev
->dev_reservation_lock
);
1311 spin_lock_init(&dev
->dev_status_lock
);
1312 spin_lock_init(&dev
->se_port_lock
);
1313 spin_lock_init(&dev
->se_tmr_lock
);
1314 spin_lock_init(&dev
->qf_cmd_lock
);
1315 atomic_set(&dev
->dev_ordered_id
, 0);
1317 se_dev_set_default_attribs(dev
, dev_limits
);
1319 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1320 dev
->creation_time
= get_jiffies_64();
1321 spin_lock_init(&dev
->stats_lock
);
1323 spin_lock(&hba
->device_lock
);
1324 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1326 spin_unlock(&hba
->device_lock
);
1328 * Setup the SAM Task Attribute emulation for struct se_device
1330 core_setup_task_attr_emulation(dev
);
1332 * Force PR and ALUA passthrough emulation with internal object use.
1334 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1336 * Setup the Reservations infrastructure for struct se_device
1338 core_setup_reservations(dev
, force_pt
);
1340 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1342 if (core_setup_alua(dev
, force_pt
) < 0)
1346 * Startup the struct se_device processing thread
1348 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1349 "LIO_%s", dev
->transport
->name
);
1350 if (IS_ERR(dev
->process_thread
)) {
1351 pr_err("Unable to create kthread: LIO_%s\n",
1352 dev
->transport
->name
);
1356 * Setup work_queue for QUEUE_FULL
1358 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1360 * Preload the initial INQUIRY const values if we are doing
1361 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1362 * passthrough because this is being provided by the backend LLD.
1363 * This is required so that transport_get_inquiry() copies these
1364 * originals once back into DEV_T10_WWN(dev) for the virtual device
1367 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1368 if (!inquiry_prod
|| !inquiry_rev
) {
1369 pr_err("All non TCM/pSCSI plugins require"
1370 " INQUIRY consts\n");
1374 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1375 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1376 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1378 scsi_dump_inquiry(dev
);
1382 kthread_stop(dev
->process_thread
);
1384 spin_lock(&hba
->device_lock
);
1385 list_del(&dev
->dev_list
);
1387 spin_unlock(&hba
->device_lock
);
1389 se_release_vpd_for_dev(dev
);
1395 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1397 /* transport_generic_prepare_cdb():
1399 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1400 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1401 * The point of this is since we are mapping iSCSI LUNs to
1402 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1403 * devices and HBAs for a loop.
1405 static inline void transport_generic_prepare_cdb(
1409 case READ_10
: /* SBC - RDProtect */
1410 case READ_12
: /* SBC - RDProtect */
1411 case READ_16
: /* SBC - RDProtect */
1412 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1413 case VERIFY
: /* SBC - VRProtect */
1414 case VERIFY_16
: /* SBC - VRProtect */
1415 case WRITE_VERIFY
: /* SBC - VRProtect */
1416 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1419 cdb
[1] &= 0x1f; /* clear logical unit number */
1424 static struct se_task
*
1425 transport_generic_get_task(struct se_cmd
*cmd
,
1426 enum dma_data_direction data_direction
)
1428 struct se_task
*task
;
1429 struct se_device
*dev
= cmd
->se_dev
;
1431 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1433 pr_err("Unable to allocate struct se_task\n");
1437 INIT_LIST_HEAD(&task
->t_list
);
1438 INIT_LIST_HEAD(&task
->t_execute_list
);
1439 INIT_LIST_HEAD(&task
->t_state_list
);
1440 init_completion(&task
->task_stop_comp
);
1441 task
->task_se_cmd
= cmd
;
1442 task
->task_data_direction
= data_direction
;
1447 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1450 * Used by fabric modules containing a local struct se_cmd within their
1451 * fabric dependent per I/O descriptor.
1453 void transport_init_se_cmd(
1455 struct target_core_fabric_ops
*tfo
,
1456 struct se_session
*se_sess
,
1460 unsigned char *sense_buffer
)
1462 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1463 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1464 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1465 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1466 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1467 INIT_LIST_HEAD(&cmd
->t_task_list
);
1468 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1469 init_completion(&cmd
->transport_lun_stop_comp
);
1470 init_completion(&cmd
->t_transport_stop_comp
);
1471 init_completion(&cmd
->cmd_wait_comp
);
1472 spin_lock_init(&cmd
->t_state_lock
);
1473 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1476 cmd
->se_sess
= se_sess
;
1477 cmd
->data_length
= data_length
;
1478 cmd
->data_direction
= data_direction
;
1479 cmd
->sam_task_attr
= task_attr
;
1480 cmd
->sense_buffer
= sense_buffer
;
1482 EXPORT_SYMBOL(transport_init_se_cmd
);
1484 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1487 * Check if SAM Task Attribute emulation is enabled for this
1488 * struct se_device storage object
1490 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1493 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1494 pr_debug("SAM Task Attribute ACA"
1495 " emulation is not supported\n");
1499 * Used to determine when ORDERED commands should go from
1500 * Dormant to Active status.
1502 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1503 smp_mb__after_atomic_inc();
1504 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1505 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1506 cmd
->se_dev
->transport
->name
);
1510 /* transport_generic_allocate_tasks():
1512 * Called from fabric RX Thread.
1514 int transport_generic_allocate_tasks(
1520 transport_generic_prepare_cdb(cdb
);
1522 * Ensure that the received CDB is less than the max (252 + 8) bytes
1523 * for VARIABLE_LENGTH_CMD
1525 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1526 pr_err("Received SCSI CDB with command_size: %d that"
1527 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1528 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1529 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1530 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1534 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1535 * allocate the additional extended CDB buffer now.. Otherwise
1536 * setup the pointer from __t_task_cdb to t_task_cdb.
1538 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1539 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1541 if (!cmd
->t_task_cdb
) {
1542 pr_err("Unable to allocate cmd->t_task_cdb"
1543 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1544 scsi_command_size(cdb
),
1545 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1546 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1547 cmd
->scsi_sense_reason
=
1548 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1552 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1554 * Copy the original CDB into cmd->
1556 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1558 * Setup the received CDB based on SCSI defined opcodes and
1559 * perform unit attention, persistent reservations and ALUA
1560 * checks for virtual device backends. The cmd->t_task_cdb
1561 * pointer is expected to be setup before we reach this point.
1563 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1567 * Check for SAM Task Attribute Emulation
1569 if (transport_check_alloc_task_attr(cmd
) < 0) {
1570 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1571 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1574 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1575 if (cmd
->se_lun
->lun_sep
)
1576 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1577 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1580 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1583 * Used by fabric module frontends to queue tasks directly.
1584 * Many only be used from process context only
1586 int transport_handle_cdb_direct(
1593 pr_err("cmd->se_lun is NULL\n");
1596 if (in_interrupt()) {
1598 pr_err("transport_generic_handle_cdb cannot be called"
1599 " from interrupt context\n");
1603 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1604 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1605 * in existing usage to ensure that outstanding descriptors are handled
1606 * correctly during shutdown via transport_wait_for_tasks()
1608 * Also, we don't take cmd->t_state_lock here as we only expect
1609 * this to be called for initial descriptor submission.
1611 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1612 cmd
->transport_state
|= CMD_T_ACTIVE
;
1615 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1616 * so follow TRANSPORT_NEW_CMD processing thread context usage
1617 * and call transport_generic_request_failure() if necessary..
1619 ret
= transport_generic_new_cmd(cmd
);
1621 transport_generic_request_failure(cmd
);
1625 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1628 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1630 * @se_cmd: command descriptor to submit
1631 * @se_sess: associated se_sess for endpoint
1632 * @cdb: pointer to SCSI CDB
1633 * @sense: pointer to SCSI sense buffer
1634 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1635 * @data_length: fabric expected data transfer length
1636 * @task_addr: SAM task attribute
1637 * @data_dir: DMA data direction
1638 * @flags: flags for command submission from target_sc_flags_tables
1640 * This may only be called from process context, and also currently
1641 * assumes internal allocation of fabric payload buffer by target-core.
1643 void target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1644 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1645 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1647 struct se_portal_group
*se_tpg
;
1650 se_tpg
= se_sess
->se_tpg
;
1652 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1653 BUG_ON(in_interrupt());
1655 * Initialize se_cmd for target operation. From this point
1656 * exceptions are handled by sending exception status via
1657 * target_core_fabric_ops->queue_status() callback
1659 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1660 data_length
, data_dir
, task_attr
, sense
);
1662 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1663 * se_sess->sess_cmd_list. A second kref_get here is necessary
1664 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1665 * kref_put() to happen during fabric packet acknowledgement.
1667 target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1669 * Signal bidirectional data payloads to target-core
1671 if (flags
& TARGET_SCF_BIDI_OP
)
1672 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1674 * Locate se_lun pointer and attach it to struct se_cmd
1676 if (transport_lookup_cmd_lun(se_cmd
, unpacked_lun
) < 0) {
1677 transport_send_check_condition_and_sense(se_cmd
,
1678 se_cmd
->scsi_sense_reason
, 0);
1679 target_put_sess_cmd(se_sess
, se_cmd
);
1683 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1684 * allocate the necessary tasks to complete the received CDB+data
1686 rc
= transport_generic_allocate_tasks(se_cmd
, cdb
);
1688 transport_generic_request_failure(se_cmd
);
1692 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1693 * for immediate execution of READs, otherwise wait for
1694 * transport_generic_handle_data() to be called for WRITEs
1695 * when fabric has filled the incoming buffer.
1697 transport_handle_cdb_direct(se_cmd
);
1700 EXPORT_SYMBOL(target_submit_cmd
);
1703 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1704 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1705 * complete setup in TCM process context w/ TFO->new_cmd_map().
1707 int transport_generic_handle_cdb_map(
1712 pr_err("cmd->se_lun is NULL\n");
1716 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
, false);
1719 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1721 /* transport_generic_handle_data():
1725 int transport_generic_handle_data(
1729 * For the software fabric case, then we assume the nexus is being
1730 * failed/shutdown when signals are pending from the kthread context
1731 * caller, so we return a failure. For the HW target mode case running
1732 * in interrupt code, the signal_pending() check is skipped.
1734 if (!in_interrupt() && signal_pending(current
))
1737 * If the received CDB has aleady been ABORTED by the generic
1738 * target engine, we now call transport_check_aborted_status()
1739 * to queue any delated TASK_ABORTED status for the received CDB to the
1740 * fabric module as we are expecting no further incoming DATA OUT
1741 * sequences at this point.
1743 if (transport_check_aborted_status(cmd
, 1) != 0)
1746 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
, false);
1749 EXPORT_SYMBOL(transport_generic_handle_data
);
1751 /* transport_generic_handle_tmr():
1755 int transport_generic_handle_tmr(
1758 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
, false);
1761 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1764 * If the task is active, request it to be stopped and sleep until it
1767 bool target_stop_task(struct se_task
*task
, unsigned long *flags
)
1769 struct se_cmd
*cmd
= task
->task_se_cmd
;
1770 bool was_active
= false;
1772 if (task
->task_flags
& TF_ACTIVE
) {
1773 task
->task_flags
|= TF_REQUEST_STOP
;
1774 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1776 pr_debug("Task %p waiting to complete\n", task
);
1777 wait_for_completion(&task
->task_stop_comp
);
1778 pr_debug("Task %p stopped successfully\n", task
);
1780 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1781 atomic_dec(&cmd
->t_task_cdbs_left
);
1782 task
->task_flags
&= ~(TF_ACTIVE
| TF_REQUEST_STOP
);
1789 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1791 struct se_task
*task
, *task_tmp
;
1792 unsigned long flags
;
1795 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1796 cmd
->se_tfo
->get_task_tag(cmd
));
1799 * No tasks remain in the execution queue
1801 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1802 list_for_each_entry_safe(task
, task_tmp
,
1803 &cmd
->t_task_list
, t_list
) {
1804 pr_debug("Processing task %p\n", task
);
1806 * If the struct se_task has not been sent and is not active,
1807 * remove the struct se_task from the execution queue.
1809 if (!(task
->task_flags
& (TF_ACTIVE
| TF_SENT
))) {
1810 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1812 transport_remove_task_from_execute_queue(task
,
1815 pr_debug("Task %p removed from execute queue\n", task
);
1816 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1820 if (!target_stop_task(task
, &flags
)) {
1821 pr_debug("Task %p - did nothing\n", task
);
1825 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1831 * Handle SAM-esque emulation for generic transport request failures.
1833 static void transport_generic_request_failure(struct se_cmd
*cmd
)
1837 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1838 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1839 cmd
->t_task_cdb
[0]);
1840 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1841 cmd
->se_tfo
->get_cmd_state(cmd
),
1842 cmd
->t_state
, cmd
->scsi_sense_reason
);
1843 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1844 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1845 " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1846 cmd
->t_task_list_num
,
1847 atomic_read(&cmd
->t_task_cdbs_left
),
1848 atomic_read(&cmd
->t_task_cdbs_sent
),
1849 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1850 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1851 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1852 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1855 * For SAM Task Attribute emulation for failed struct se_cmd
1857 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1858 transport_complete_task_attr(cmd
);
1860 switch (cmd
->scsi_sense_reason
) {
1861 case TCM_NON_EXISTENT_LUN
:
1862 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1863 case TCM_INVALID_CDB_FIELD
:
1864 case TCM_INVALID_PARAMETER_LIST
:
1865 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1866 case TCM_UNKNOWN_MODE_PAGE
:
1867 case TCM_WRITE_PROTECTED
:
1868 case TCM_CHECK_CONDITION_ABORT_CMD
:
1869 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1870 case TCM_CHECK_CONDITION_NOT_READY
:
1872 case TCM_RESERVATION_CONFLICT
:
1874 * No SENSE Data payload for this case, set SCSI Status
1875 * and queue the response to $FABRIC_MOD.
1877 * Uses linux/include/scsi/scsi.h SAM status codes defs
1879 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1881 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1882 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1885 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1888 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1889 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1890 cmd
->orig_fe_lun
, 0x2C,
1891 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1893 ret
= cmd
->se_tfo
->queue_status(cmd
);
1894 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1898 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1899 cmd
->t_task_cdb
[0], cmd
->scsi_sense_reason
);
1900 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1904 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1905 * make the call to transport_send_check_condition_and_sense()
1906 * directly. Otherwise expect the fabric to make the call to
1907 * transport_send_check_condition_and_sense() after handling
1908 * possible unsoliticied write data payloads.
1910 ret
= transport_send_check_condition_and_sense(cmd
,
1911 cmd
->scsi_sense_reason
, 0);
1912 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1916 transport_lun_remove_cmd(cmd
);
1917 if (!transport_cmd_check_stop_to_fabric(cmd
))
1922 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1923 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1926 static inline u32
transport_lba_21(unsigned char *cdb
)
1928 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
1931 static inline u32
transport_lba_32(unsigned char *cdb
)
1933 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1936 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
1938 unsigned int __v1
, __v2
;
1940 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1941 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1943 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1947 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1949 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
1951 unsigned int __v1
, __v2
;
1953 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
1954 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
1956 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1959 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
1961 unsigned long flags
;
1963 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
1964 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1965 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
1969 * Called from Fabric Module context from transport_execute_tasks()
1971 * The return of this function determins if the tasks from struct se_cmd
1972 * get added to the execution queue in transport_execute_tasks(),
1973 * or are added to the delayed or ordered lists here.
1975 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
1977 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1980 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1981 * to allow the passed struct se_cmd list of tasks to the front of the list.
1983 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1984 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1985 " 0x%02x, se_ordered_id: %u\n",
1987 cmd
->se_ordered_id
);
1989 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1990 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
1991 smp_mb__after_atomic_inc();
1993 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1994 " list, se_ordered_id: %u\n",
1996 cmd
->se_ordered_id
);
1998 * Add ORDERED command to tail of execution queue if
1999 * no other older commands exist that need to be
2002 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2006 * For SIMPLE and UNTAGGED Task Attribute commands
2008 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2009 smp_mb__after_atomic_inc();
2012 * Otherwise if one or more outstanding ORDERED task attribute exist,
2013 * add the dormant task(s) built for the passed struct se_cmd to the
2014 * execution queue and become in Active state for this struct se_device.
2016 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2018 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2019 * will be drained upon completion of HEAD_OF_QUEUE task.
2021 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2022 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2023 list_add_tail(&cmd
->se_delayed_node
,
2024 &cmd
->se_dev
->delayed_cmd_list
);
2025 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2027 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2028 " delayed CMD list, se_ordered_id: %u\n",
2029 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2030 cmd
->se_ordered_id
);
2032 * Return zero to let transport_execute_tasks() know
2033 * not to add the delayed tasks to the execution list.
2038 * Otherwise, no ORDERED task attributes exist..
2044 * Called from fabric module context in transport_generic_new_cmd() and
2045 * transport_generic_process_write()
2047 static int transport_execute_tasks(struct se_cmd
*cmd
)
2050 struct se_device
*se_dev
= cmd
->se_dev
;
2052 * Call transport_cmd_check_stop() to see if a fabric exception
2053 * has occurred that prevents execution.
2055 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2057 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2058 * attribute for the tasks of the received struct se_cmd CDB
2060 add_tasks
= transport_execute_task_attr(cmd
);
2064 * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2065 * adds associated se_tasks while holding dev->execute_task_lock
2066 * before I/O dispath to avoid a double spinlock access.
2068 __transport_execute_tasks(se_dev
, cmd
);
2073 __transport_execute_tasks(se_dev
, NULL
);
2078 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2079 * from struct se_device->execute_task_list and
2081 * Called from transport_processing_thread()
2083 static int __transport_execute_tasks(struct se_device
*dev
, struct se_cmd
*new_cmd
)
2086 struct se_cmd
*cmd
= NULL
;
2087 struct se_task
*task
= NULL
;
2088 unsigned long flags
;
2091 spin_lock_irq(&dev
->execute_task_lock
);
2092 if (new_cmd
!= NULL
)
2093 __transport_add_tasks_from_cmd(new_cmd
);
2095 if (list_empty(&dev
->execute_task_list
)) {
2096 spin_unlock_irq(&dev
->execute_task_lock
);
2099 task
= list_first_entry(&dev
->execute_task_list
,
2100 struct se_task
, t_execute_list
);
2101 __transport_remove_task_from_execute_queue(task
, dev
);
2102 spin_unlock_irq(&dev
->execute_task_lock
);
2104 cmd
= task
->task_se_cmd
;
2105 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2106 task
->task_flags
|= (TF_ACTIVE
| TF_SENT
);
2107 atomic_inc(&cmd
->t_task_cdbs_sent
);
2109 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2110 cmd
->t_task_list_num
)
2111 cmd
->transport_state
|= CMD_T_SENT
;
2113 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2115 if (cmd
->execute_task
)
2116 error
= cmd
->execute_task(task
);
2118 error
= dev
->transport
->do_task(task
);
2120 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2121 task
->task_flags
&= ~TF_ACTIVE
;
2122 cmd
->transport_state
&= ~CMD_T_SENT
;
2123 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2125 transport_stop_tasks_for_cmd(cmd
);
2126 transport_generic_request_failure(cmd
);
2135 static inline u32
transport_get_sectors_6(
2140 struct se_device
*dev
= cmd
->se_dev
;
2143 * Assume TYPE_DISK for non struct se_device objects.
2144 * Use 8-bit sector value.
2150 * Use 24-bit allocation length for TYPE_TAPE.
2152 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2153 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2156 * Everything else assume TYPE_DISK Sector CDB location.
2157 * Use 8-bit sector value. SBC-3 says:
2159 * A TRANSFER LENGTH field set to zero specifies that 256
2160 * logical blocks shall be written. Any other value
2161 * specifies the number of logical blocks that shall be
2165 return cdb
[4] ? : 256;
2168 static inline u32
transport_get_sectors_10(
2173 struct se_device
*dev
= cmd
->se_dev
;
2176 * Assume TYPE_DISK for non struct se_device objects.
2177 * Use 16-bit sector value.
2183 * XXX_10 is not defined in SSC, throw an exception
2185 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2191 * Everything else assume TYPE_DISK Sector CDB location.
2192 * Use 16-bit sector value.
2195 return (u32
)(cdb
[7] << 8) + cdb
[8];
2198 static inline u32
transport_get_sectors_12(
2203 struct se_device
*dev
= cmd
->se_dev
;
2206 * Assume TYPE_DISK for non struct se_device objects.
2207 * Use 32-bit sector value.
2213 * XXX_12 is not defined in SSC, throw an exception
2215 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2221 * Everything else assume TYPE_DISK Sector CDB location.
2222 * Use 32-bit sector value.
2225 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2228 static inline u32
transport_get_sectors_16(
2233 struct se_device
*dev
= cmd
->se_dev
;
2236 * Assume TYPE_DISK for non struct se_device objects.
2237 * Use 32-bit sector value.
2243 * Use 24-bit allocation length for TYPE_TAPE.
2245 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2246 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2249 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2250 (cdb
[12] << 8) + cdb
[13];
2254 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2256 static inline u32
transport_get_sectors_32(
2262 * Assume TYPE_DISK for non struct se_device objects.
2263 * Use 32-bit sector value.
2265 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2266 (cdb
[30] << 8) + cdb
[31];
2270 static inline u32
transport_get_size(
2275 struct se_device
*dev
= cmd
->se_dev
;
2277 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2278 if (cdb
[1] & 1) { /* sectors */
2279 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2284 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2285 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2286 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2287 dev
->transport
->name
);
2289 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2292 static void transport_xor_callback(struct se_cmd
*cmd
)
2294 unsigned char *buf
, *addr
;
2295 struct scatterlist
*sg
;
2296 unsigned int offset
;
2300 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2302 * 1) read the specified logical block(s);
2303 * 2) transfer logical blocks from the data-out buffer;
2304 * 3) XOR the logical blocks transferred from the data-out buffer with
2305 * the logical blocks read, storing the resulting XOR data in a buffer;
2306 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2307 * blocks transferred from the data-out buffer; and
2308 * 5) transfer the resulting XOR data to the data-in buffer.
2310 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2312 pr_err("Unable to allocate xor_callback buf\n");
2316 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2317 * into the locally allocated *buf
2319 sg_copy_to_buffer(cmd
->t_data_sg
,
2325 * Now perform the XOR against the BIDI read memory located at
2326 * cmd->t_mem_bidi_list
2330 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2331 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2335 for (i
= 0; i
< sg
->length
; i
++)
2336 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2338 offset
+= sg
->length
;
2339 kunmap_atomic(addr
, KM_USER0
);
2347 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2349 static int transport_get_sense_data(struct se_cmd
*cmd
)
2351 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2352 struct se_device
*dev
= cmd
->se_dev
;
2353 struct se_task
*task
= NULL
, *task_tmp
;
2354 unsigned long flags
;
2357 WARN_ON(!cmd
->se_lun
);
2362 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2363 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2364 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2368 list_for_each_entry_safe(task
, task_tmp
,
2369 &cmd
->t_task_list
, t_list
) {
2370 if (!(task
->task_flags
& TF_HAS_SENSE
))
2373 if (!dev
->transport
->get_sense_buffer
) {
2374 pr_err("dev->transport->get_sense_buffer"
2379 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2380 if (!sense_buffer
) {
2381 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2382 " sense buffer for task with sense\n",
2383 cmd
->se_tfo
->get_task_tag(cmd
), task
);
2386 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2388 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2389 TRANSPORT_SENSE_BUFFER
);
2391 memcpy(&buffer
[offset
], sense_buffer
,
2392 TRANSPORT_SENSE_BUFFER
);
2393 cmd
->scsi_status
= task
->task_scsi_status
;
2394 /* Automatically padded */
2395 cmd
->scsi_sense_length
=
2396 (TRANSPORT_SENSE_BUFFER
+ offset
);
2398 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2400 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2404 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2409 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2411 return dev
->transport
->get_blocks(dev
) + 1;
2414 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2416 struct se_device
*dev
= cmd
->se_dev
;
2419 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2422 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2424 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2425 pr_err("LBA: %llu Sectors: %u exceeds"
2426 " transport_dev_end_lba(): %llu\n",
2427 cmd
->t_task_lba
, sectors
,
2428 transport_dev_end_lba(dev
));
2435 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2438 * Determine if the received WRITE_SAME is used to for direct
2439 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2440 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2441 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2443 int passthrough
= (dev
->transport
->transport_type
==
2444 TRANSPORT_PLUGIN_PHBA_PDEV
);
2447 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2448 pr_err("WRITE_SAME PBDATA and LBDATA"
2449 " bits not supported for Block Discard"
2454 * Currently for the emulated case we only accept
2455 * tpws with the UNMAP=1 bit set.
2457 if (!(flags
[0] & 0x08)) {
2458 pr_err("WRITE_SAME w/o UNMAP bit not"
2459 " supported for Block Discard Emulation\n");
2467 /* transport_generic_cmd_sequencer():
2469 * Generic Command Sequencer that should work for most DAS transport
2472 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2475 * FIXME: Need to support other SCSI OPCODES where as well.
2477 static int transport_generic_cmd_sequencer(
2481 struct se_device
*dev
= cmd
->se_dev
;
2482 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2483 int ret
= 0, sector_ret
= 0, passthrough
;
2484 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2488 * Check for an existing UNIT ATTENTION condition
2490 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2491 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2492 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2496 * Check status of Asymmetric Logical Unit Assignment port
2498 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2501 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2502 * The ALUA additional sense code qualifier (ASCQ) is determined
2503 * by the ALUA primary or secondary access state..
2507 pr_debug("[%s]: ALUA TG Port not available,"
2508 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2509 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2511 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2512 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2513 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2516 goto out_invalid_cdb_field
;
2519 * Check status for SPC-3 Persistent Reservations
2521 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2522 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2523 cmd
, cdb
, pr_reg_type
) != 0) {
2524 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2525 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2526 cmd
->scsi_sense_reason
= TCM_RESERVATION_CONFLICT
;
2530 * This means the CDB is allowed for the SCSI Initiator port
2531 * when said port is *NOT* holding the legacy SPC-2 or
2532 * SPC-3 Persistent Reservation.
2537 * If we operate in passthrough mode we skip most CDB emulation and
2538 * instead hand the commands down to the physical SCSI device.
2541 (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
);
2545 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2547 goto out_unsupported_cdb
;
2548 size
= transport_get_size(sectors
, cdb
, cmd
);
2549 cmd
->t_task_lba
= transport_lba_21(cdb
);
2550 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2553 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2555 goto out_unsupported_cdb
;
2556 size
= transport_get_size(sectors
, cdb
, cmd
);
2557 cmd
->t_task_lba
= transport_lba_32(cdb
);
2558 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2561 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2563 goto out_unsupported_cdb
;
2564 size
= transport_get_size(sectors
, cdb
, cmd
);
2565 cmd
->t_task_lba
= transport_lba_32(cdb
);
2566 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2569 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2571 goto out_unsupported_cdb
;
2572 size
= transport_get_size(sectors
, cdb
, cmd
);
2573 cmd
->t_task_lba
= transport_lba_64(cdb
);
2574 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2577 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2579 goto out_unsupported_cdb
;
2580 size
= transport_get_size(sectors
, cdb
, cmd
);
2581 cmd
->t_task_lba
= transport_lba_21(cdb
);
2582 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2585 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2587 goto out_unsupported_cdb
;
2588 size
= transport_get_size(sectors
, cdb
, cmd
);
2589 cmd
->t_task_lba
= transport_lba_32(cdb
);
2591 cmd
->se_cmd_flags
|= SCF_FUA
;
2592 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2595 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2597 goto out_unsupported_cdb
;
2598 size
= transport_get_size(sectors
, cdb
, cmd
);
2599 cmd
->t_task_lba
= transport_lba_32(cdb
);
2601 cmd
->se_cmd_flags
|= SCF_FUA
;
2602 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2605 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2607 goto out_unsupported_cdb
;
2608 size
= transport_get_size(sectors
, cdb
, cmd
);
2609 cmd
->t_task_lba
= transport_lba_64(cdb
);
2611 cmd
->se_cmd_flags
|= SCF_FUA
;
2612 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2614 case XDWRITEREAD_10
:
2615 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2616 !(cmd
->se_cmd_flags
& SCF_BIDI
))
2617 goto out_invalid_cdb_field
;
2618 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2620 goto out_unsupported_cdb
;
2621 size
= transport_get_size(sectors
, cdb
, cmd
);
2622 cmd
->t_task_lba
= transport_lba_32(cdb
);
2623 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2626 * Do now allow BIDI commands for passthrough mode.
2629 goto out_unsupported_cdb
;
2632 * Setup BIDI XOR callback to be run after I/O completion.
2634 cmd
->transport_complete_callback
= &transport_xor_callback
;
2636 cmd
->se_cmd_flags
|= SCF_FUA
;
2638 case VARIABLE_LENGTH_CMD
:
2639 service_action
= get_unaligned_be16(&cdb
[8]);
2640 switch (service_action
) {
2641 case XDWRITEREAD_32
:
2642 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2644 goto out_unsupported_cdb
;
2645 size
= transport_get_size(sectors
, cdb
, cmd
);
2647 * Use WRITE_32 and READ_32 opcodes for the emulated
2648 * XDWRITE_READ_32 logic.
2650 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2651 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2654 * Do now allow BIDI commands for passthrough mode.
2657 goto out_unsupported_cdb
;
2660 * Setup BIDI XOR callback to be run during after I/O
2663 cmd
->transport_complete_callback
= &transport_xor_callback
;
2665 cmd
->se_cmd_flags
|= SCF_FUA
;
2668 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2670 goto out_unsupported_cdb
;
2673 size
= transport_get_size(1, cdb
, cmd
);
2675 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2677 goto out_invalid_cdb_field
;
2680 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2681 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2683 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2684 goto out_unsupported_cdb
;
2686 cmd
->execute_task
= target_emulate_write_same
;
2689 pr_err("VARIABLE_LENGTH_CMD service action"
2690 " 0x%04x not supported\n", service_action
);
2691 goto out_unsupported_cdb
;
2694 case MAINTENANCE_IN
:
2695 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2696 /* MAINTENANCE_IN from SCC-2 */
2698 * Check for emulated MI_REPORT_TARGET_PGS.
2700 if (cdb
[1] == MI_REPORT_TARGET_PGS
&&
2701 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2703 target_emulate_report_target_port_groups
;
2705 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2706 (cdb
[8] << 8) | cdb
[9];
2708 /* GPCMD_SEND_KEY from multi media commands */
2709 size
= (cdb
[8] << 8) + cdb
[9];
2711 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2715 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2717 case MODE_SELECT_10
:
2718 size
= (cdb
[7] << 8) + cdb
[8];
2719 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2723 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2725 cmd
->execute_task
= target_emulate_modesense
;
2728 size
= (cdb
[7] << 8) + cdb
[8];
2729 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2731 cmd
->execute_task
= target_emulate_modesense
;
2733 case GPCMD_READ_BUFFER_CAPACITY
:
2734 case GPCMD_SEND_OPC
:
2737 size
= (cdb
[7] << 8) + cdb
[8];
2738 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2740 case READ_BLOCK_LIMITS
:
2741 size
= READ_BLOCK_LEN
;
2742 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2744 case GPCMD_GET_CONFIGURATION
:
2745 case GPCMD_READ_FORMAT_CAPACITIES
:
2746 case GPCMD_READ_DISC_INFO
:
2747 case GPCMD_READ_TRACK_RZONE_INFO
:
2748 size
= (cdb
[7] << 8) + cdb
[8];
2749 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2751 case PERSISTENT_RESERVE_IN
:
2752 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2753 cmd
->execute_task
= target_scsi3_emulate_pr_in
;
2754 size
= (cdb
[7] << 8) + cdb
[8];
2755 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2757 case PERSISTENT_RESERVE_OUT
:
2758 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2759 cmd
->execute_task
= target_scsi3_emulate_pr_out
;
2760 size
= (cdb
[7] << 8) + cdb
[8];
2761 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2763 case GPCMD_MECHANISM_STATUS
:
2764 case GPCMD_READ_DVD_STRUCTURE
:
2765 size
= (cdb
[8] << 8) + cdb
[9];
2766 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2769 size
= READ_POSITION_LEN
;
2770 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2772 case MAINTENANCE_OUT
:
2773 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2774 /* MAINTENANCE_OUT from SCC-2
2776 * Check for emulated MO_SET_TARGET_PGS.
2778 if (cdb
[1] == MO_SET_TARGET_PGS
&&
2779 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2781 target_emulate_set_target_port_groups
;
2784 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2785 (cdb
[8] << 8) | cdb
[9];
2787 /* GPCMD_REPORT_KEY from multi media commands */
2788 size
= (cdb
[8] << 8) + cdb
[9];
2790 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2793 size
= (cdb
[3] << 8) + cdb
[4];
2795 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2796 * See spc4r17 section 5.3
2798 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2799 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
2800 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2802 cmd
->execute_task
= target_emulate_inquiry
;
2805 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2806 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2809 size
= READ_CAP_LEN
;
2810 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2812 cmd
->execute_task
= target_emulate_readcapacity
;
2814 case READ_MEDIA_SERIAL_NUMBER
:
2815 case SECURITY_PROTOCOL_IN
:
2816 case SECURITY_PROTOCOL_OUT
:
2817 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2818 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2820 case SERVICE_ACTION_IN
:
2821 switch (cmd
->t_task_cdb
[1] & 0x1f) {
2822 case SAI_READ_CAPACITY_16
:
2825 target_emulate_readcapacity_16
;
2831 pr_err("Unsupported SA: 0x%02x\n",
2832 cmd
->t_task_cdb
[1] & 0x1f);
2833 goto out_unsupported_cdb
;
2836 case ACCESS_CONTROL_IN
:
2837 case ACCESS_CONTROL_OUT
:
2839 case READ_ATTRIBUTE
:
2840 case RECEIVE_COPY_RESULTS
:
2841 case WRITE_ATTRIBUTE
:
2842 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
2843 (cdb
[12] << 8) | cdb
[13];
2844 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2846 case RECEIVE_DIAGNOSTIC
:
2847 case SEND_DIAGNOSTIC
:
2848 size
= (cdb
[3] << 8) | cdb
[4];
2849 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2851 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2854 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2855 size
= (2336 * sectors
);
2856 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2861 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2865 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2867 cmd
->execute_task
= target_emulate_request_sense
;
2869 case READ_ELEMENT_STATUS
:
2870 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
2871 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2874 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2875 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2880 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2881 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2883 if (cdb
[0] == RESERVE_10
)
2884 size
= (cdb
[7] << 8) | cdb
[8];
2886 size
= cmd
->data_length
;
2889 * Setup the legacy emulated handler for SPC-2 and
2890 * >= SPC-3 compatible reservation handling (CRH=1)
2891 * Otherwise, we assume the underlying SCSI logic is
2892 * is running in SPC_PASSTHROUGH, and wants reservations
2893 * emulation disabled.
2895 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2896 cmd
->execute_task
= target_scsi2_reservation_reserve
;
2897 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2902 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2903 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2905 if (cdb
[0] == RELEASE_10
)
2906 size
= (cdb
[7] << 8) | cdb
[8];
2908 size
= cmd
->data_length
;
2910 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2911 cmd
->execute_task
= target_scsi2_reservation_release
;
2912 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2914 case SYNCHRONIZE_CACHE
:
2915 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2917 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2919 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
2920 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2921 cmd
->t_task_lba
= transport_lba_32(cdb
);
2923 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2924 cmd
->t_task_lba
= transport_lba_64(cdb
);
2927 goto out_unsupported_cdb
;
2929 size
= transport_get_size(sectors
, cdb
, cmd
);
2930 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2936 * Check to ensure that LBA + Range does not exceed past end of
2937 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2939 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
2940 if (transport_cmd_get_valid_sectors(cmd
) < 0)
2941 goto out_invalid_cdb_field
;
2943 cmd
->execute_task
= target_emulate_synchronize_cache
;
2946 size
= get_unaligned_be16(&cdb
[7]);
2947 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2949 cmd
->execute_task
= target_emulate_unmap
;
2952 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2954 goto out_unsupported_cdb
;
2957 size
= transport_get_size(1, cdb
, cmd
);
2959 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2960 goto out_invalid_cdb_field
;
2963 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
2964 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2966 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2967 goto out_unsupported_cdb
;
2969 cmd
->execute_task
= target_emulate_write_same
;
2972 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2974 goto out_unsupported_cdb
;
2977 size
= transport_get_size(1, cdb
, cmd
);
2979 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2980 goto out_invalid_cdb_field
;
2983 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
2984 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2986 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2987 * of byte 1 bit 3 UNMAP instead of original reserved field
2989 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2990 goto out_unsupported_cdb
;
2992 cmd
->execute_task
= target_emulate_write_same
;
2994 case ALLOW_MEDIUM_REMOVAL
:
3000 case TEST_UNIT_READY
:
3002 case WRITE_FILEMARKS
:
3003 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3005 cmd
->execute_task
= target_emulate_noop
;
3007 case GPCMD_CLOSE_TRACK
:
3008 case INITIALIZE_ELEMENT_STATUS
:
3009 case GPCMD_LOAD_UNLOAD
:
3010 case GPCMD_SET_SPEED
:
3012 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3015 cmd
->execute_task
= target_report_luns
;
3016 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3018 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3019 * See spc4r17 section 5.3
3021 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3022 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3023 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3026 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3027 " 0x%02x, sending CHECK_CONDITION.\n",
3028 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3029 goto out_unsupported_cdb
;
3032 if (size
!= cmd
->data_length
) {
3033 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3034 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3035 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3036 cmd
->data_length
, size
, cdb
[0]);
3038 cmd
->cmd_spdtl
= size
;
3040 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3041 pr_err("Rejecting underflow/overflow"
3043 goto out_invalid_cdb_field
;
3046 * Reject READ_* or WRITE_* with overflow/underflow for
3047 * type SCF_SCSI_DATA_SG_IO_CDB.
3049 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3050 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3051 " CDB on non 512-byte sector setup subsystem"
3052 " plugin: %s\n", dev
->transport
->name
);
3053 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3054 goto out_invalid_cdb_field
;
3057 if (size
> cmd
->data_length
) {
3058 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3059 cmd
->residual_count
= (size
- cmd
->data_length
);
3061 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3062 cmd
->residual_count
= (cmd
->data_length
- size
);
3064 cmd
->data_length
= size
;
3067 /* reject any command that we don't have a handler for */
3068 if (!(passthrough
|| cmd
->execute_task
||
3069 (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
3070 goto out_unsupported_cdb
;
3072 transport_set_supported_SAM_opcode(cmd
);
3075 out_unsupported_cdb
:
3076 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3077 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3079 out_invalid_cdb_field
:
3080 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3081 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3086 * Called from I/O completion to determine which dormant/delayed
3087 * and ordered cmds need to have their tasks added to the execution queue.
3089 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3091 struct se_device
*dev
= cmd
->se_dev
;
3092 struct se_cmd
*cmd_p
, *cmd_tmp
;
3093 int new_active_tasks
= 0;
3095 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3096 atomic_dec(&dev
->simple_cmds
);
3097 smp_mb__after_atomic_dec();
3098 dev
->dev_cur_ordered_id
++;
3099 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3100 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3101 cmd
->se_ordered_id
);
3102 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3103 dev
->dev_cur_ordered_id
++;
3104 pr_debug("Incremented dev_cur_ordered_id: %u for"
3105 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3106 cmd
->se_ordered_id
);
3107 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3108 atomic_dec(&dev
->dev_ordered_sync
);
3109 smp_mb__after_atomic_dec();
3111 dev
->dev_cur_ordered_id
++;
3112 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3113 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3116 * Process all commands up to the last received
3117 * ORDERED task attribute which requires another blocking
3120 spin_lock(&dev
->delayed_cmd_lock
);
3121 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3122 &dev
->delayed_cmd_list
, se_delayed_node
) {
3124 list_del(&cmd_p
->se_delayed_node
);
3125 spin_unlock(&dev
->delayed_cmd_lock
);
3127 pr_debug("Calling add_tasks() for"
3128 " cmd_p: 0x%02x Task Attr: 0x%02x"
3129 " Dormant -> Active, se_ordered_id: %u\n",
3130 cmd_p
->t_task_cdb
[0],
3131 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3133 transport_add_tasks_from_cmd(cmd_p
);
3136 spin_lock(&dev
->delayed_cmd_lock
);
3137 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3140 spin_unlock(&dev
->delayed_cmd_lock
);
3142 * If new tasks have become active, wake up the transport thread
3143 * to do the processing of the Active tasks.
3145 if (new_active_tasks
!= 0)
3146 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3149 static void transport_complete_qf(struct se_cmd
*cmd
)
3153 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3154 transport_complete_task_attr(cmd
);
3156 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3157 ret
= cmd
->se_tfo
->queue_status(cmd
);
3162 switch (cmd
->data_direction
) {
3163 case DMA_FROM_DEVICE
:
3164 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3167 if (cmd
->t_bidi_data_sg
) {
3168 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3172 /* Fall through for DMA_TO_DEVICE */
3174 ret
= cmd
->se_tfo
->queue_status(cmd
);
3182 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3185 transport_lun_remove_cmd(cmd
);
3186 transport_cmd_check_stop_to_fabric(cmd
);
3189 static void transport_handle_queue_full(
3191 struct se_device
*dev
)
3193 spin_lock_irq(&dev
->qf_cmd_lock
);
3194 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3195 atomic_inc(&dev
->dev_qf_count
);
3196 smp_mb__after_atomic_inc();
3197 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3199 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3202 static void target_complete_ok_work(struct work_struct
*work
)
3204 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3205 int reason
= 0, ret
;
3208 * Check if we need to move delayed/dormant tasks from cmds on the
3209 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3212 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3213 transport_complete_task_attr(cmd
);
3215 * Check to schedule QUEUE_FULL work, or execute an existing
3216 * cmd->transport_qf_callback()
3218 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3219 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3222 * Check if we need to retrieve a sense buffer from
3223 * the struct se_cmd in question.
3225 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3226 if (transport_get_sense_data(cmd
) < 0)
3227 reason
= TCM_NON_EXISTENT_LUN
;
3230 * Only set when an struct se_task->task_scsi_status returned
3231 * a non GOOD status.
3233 if (cmd
->scsi_status
) {
3234 ret
= transport_send_check_condition_and_sense(
3236 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3239 transport_lun_remove_cmd(cmd
);
3240 transport_cmd_check_stop_to_fabric(cmd
);
3245 * Check for a callback, used by amongst other things
3246 * XDWRITE_READ_10 emulation.
3248 if (cmd
->transport_complete_callback
)
3249 cmd
->transport_complete_callback(cmd
);
3251 switch (cmd
->data_direction
) {
3252 case DMA_FROM_DEVICE
:
3253 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3254 if (cmd
->se_lun
->lun_sep
) {
3255 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3258 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3260 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3261 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3265 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3266 if (cmd
->se_lun
->lun_sep
) {
3267 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3270 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3272 * Check if we need to send READ payload for BIDI-COMMAND
3274 if (cmd
->t_bidi_data_sg
) {
3275 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3276 if (cmd
->se_lun
->lun_sep
) {
3277 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3280 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3281 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3282 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3286 /* Fall through for DMA_TO_DEVICE */
3288 ret
= cmd
->se_tfo
->queue_status(cmd
);
3289 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3296 transport_lun_remove_cmd(cmd
);
3297 transport_cmd_check_stop_to_fabric(cmd
);
3301 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3302 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3303 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3304 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3307 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3309 struct se_task
*task
, *task_tmp
;
3310 unsigned long flags
;
3311 LIST_HEAD(dispose_list
);
3313 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3314 list_for_each_entry_safe(task
, task_tmp
,
3315 &cmd
->t_task_list
, t_list
) {
3316 if (!(task
->task_flags
& TF_ACTIVE
))
3317 list_move_tail(&task
->t_list
, &dispose_list
);
3319 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3321 while (!list_empty(&dispose_list
)) {
3322 task
= list_first_entry(&dispose_list
, struct se_task
, t_list
);
3324 if (task
->task_sg
!= cmd
->t_data_sg
&&
3325 task
->task_sg
!= cmd
->t_bidi_data_sg
)
3326 kfree(task
->task_sg
);
3328 list_del(&task
->t_list
);
3330 cmd
->se_dev
->transport
->free_task(task
);
3334 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3336 struct scatterlist
*sg
;
3339 for_each_sg(sgl
, sg
, nents
, count
)
3340 __free_page(sg_page(sg
));
3345 static inline void transport_free_pages(struct se_cmd
*cmd
)
3347 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3350 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3351 cmd
->t_data_sg
= NULL
;
3352 cmd
->t_data_nents
= 0;
3354 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3355 cmd
->t_bidi_data_sg
= NULL
;
3356 cmd
->t_bidi_data_nents
= 0;
3360 * transport_release_cmd - free a command
3361 * @cmd: command to free
3363 * This routine unconditionally frees a command, and reference counting
3364 * or list removal must be done in the caller.
3366 static void transport_release_cmd(struct se_cmd
*cmd
)
3368 BUG_ON(!cmd
->se_tfo
);
3370 if (cmd
->se_tmr_req
)
3371 core_tmr_release_req(cmd
->se_tmr_req
);
3372 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
3373 kfree(cmd
->t_task_cdb
);
3375 * If this cmd has been setup with target_get_sess_cmd(), drop
3376 * the kref and call ->release_cmd() in kref callback.
3378 if (cmd
->check_release
!= 0) {
3379 target_put_sess_cmd(cmd
->se_sess
, cmd
);
3382 cmd
->se_tfo
->release_cmd(cmd
);
3386 * transport_put_cmd - release a reference to a command
3387 * @cmd: command to release
3389 * This routine releases our reference to the command and frees it if possible.
3391 static void transport_put_cmd(struct se_cmd
*cmd
)
3393 unsigned long flags
;
3396 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3397 if (atomic_read(&cmd
->t_fe_count
)) {
3398 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3402 if (atomic_read(&cmd
->t_se_count
)) {
3403 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3407 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
3408 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
3409 transport_all_task_dev_remove_state(cmd
);
3412 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3414 if (free_tasks
!= 0)
3415 transport_free_dev_tasks(cmd
);
3417 transport_free_pages(cmd
);
3418 transport_release_cmd(cmd
);
3421 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3425 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3426 * allocating in the core.
3427 * @cmd: Associated se_cmd descriptor
3428 * @mem: SGL style memory for TCM WRITE / READ
3429 * @sg_mem_num: Number of SGL elements
3430 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3431 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3433 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3436 int transport_generic_map_mem_to_cmd(
3438 struct scatterlist
*sgl
,
3440 struct scatterlist
*sgl_bidi
,
3443 if (!sgl
|| !sgl_count
)
3446 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3447 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3449 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3450 * scatterlists already have been set to follow what the fabric
3451 * passes for the original expected data transfer length.
3453 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3454 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3455 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3456 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3457 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3461 cmd
->t_data_sg
= sgl
;
3462 cmd
->t_data_nents
= sgl_count
;
3464 if (sgl_bidi
&& sgl_bidi_count
) {
3465 cmd
->t_bidi_data_sg
= sgl_bidi
;
3466 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3468 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3473 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3475 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
3477 struct scatterlist
*sg
= cmd
->t_data_sg
;
3478 struct page
**pages
;
3483 * We need to take into account a possible offset here for fabrics like
3484 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3485 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3487 if (!cmd
->t_data_nents
)
3489 else if (cmd
->t_data_nents
== 1)
3490 return kmap(sg_page(sg
)) + sg
->offset
;
3492 /* >1 page. use vmap */
3493 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
3497 /* convert sg[] to pages[] */
3498 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
3499 pages
[i
] = sg_page(sg
);
3502 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
3504 if (!cmd
->t_data_vmap
)
3507 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
3509 EXPORT_SYMBOL(transport_kmap_data_sg
);
3511 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
3513 if (!cmd
->t_data_nents
)
3515 else if (cmd
->t_data_nents
== 1)
3516 kunmap(sg_page(cmd
->t_data_sg
));
3518 vunmap(cmd
->t_data_vmap
);
3519 cmd
->t_data_vmap
= NULL
;
3521 EXPORT_SYMBOL(transport_kunmap_data_sg
);
3524 transport_generic_get_mem(struct se_cmd
*cmd
)
3526 u32 length
= cmd
->data_length
;
3532 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3533 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3534 if (!cmd
->t_data_sg
)
3537 cmd
->t_data_nents
= nents
;
3538 sg_init_table(cmd
->t_data_sg
, nents
);
3540 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
? 0 : __GFP_ZERO
;
3543 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3544 page
= alloc_page(GFP_KERNEL
| zero_flag
);
3548 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3556 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3559 kfree(cmd
->t_data_sg
);
3560 cmd
->t_data_sg
= NULL
;
3564 /* Reduce sectors if they are too long for the device */
3565 static inline sector_t
transport_limit_task_sectors(
3566 struct se_device
*dev
,
3567 unsigned long long lba
,
3570 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3572 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3573 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3574 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3581 * This function can be used by HW target mode drivers to create a linked
3582 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3583 * This is intended to be called during the completion path by TCM Core
3584 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3586 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3588 struct scatterlist
*sg_first
= NULL
;
3589 struct scatterlist
*sg_prev
= NULL
;
3590 int sg_prev_nents
= 0;
3591 struct scatterlist
*sg
;
3592 struct se_task
*task
;
3593 u32 chained_nents
= 0;
3596 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3599 * Walk the struct se_task list and setup scatterlist chains
3600 * for each contiguously allocated struct se_task->task_sg[].
3602 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3607 sg_first
= task
->task_sg
;
3608 chained_nents
= task
->task_sg_nents
;
3610 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3611 chained_nents
+= task
->task_sg_nents
;
3614 * For the padded tasks, use the extra SGL vector allocated
3615 * in transport_allocate_data_tasks() for the sg_prev_nents
3616 * offset into sg_chain() above.
3618 * We do not need the padding for the last task (or a single
3619 * task), but in that case we will never use the sg_prev_nents
3620 * value below which would be incorrect.
3622 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3623 sg_prev
= task
->task_sg
;
3626 * Setup the starting pointer and total t_tasks_sg_linked_no including
3627 * padding SGs for linking and to mark the end.
3629 cmd
->t_tasks_sg_chained
= sg_first
;
3630 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3632 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3633 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3634 cmd
->t_tasks_sg_chained_no
);
3636 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
3637 cmd
->t_tasks_sg_chained_no
, i
) {
3639 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3640 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
3641 if (sg_is_chain(sg
))
3642 pr_debug("SG: %p sg_is_chain=1\n", sg
);
3644 pr_debug("SG: %p sg_is_last=1\n", sg
);
3647 EXPORT_SYMBOL(transport_do_task_sg_chain
);
3650 * Break up cmd into chunks transport can handle
3653 transport_allocate_data_tasks(struct se_cmd
*cmd
,
3654 enum dma_data_direction data_direction
,
3655 struct scatterlist
*cmd_sg
, unsigned int sgl_nents
)
3657 struct se_device
*dev
= cmd
->se_dev
;
3659 unsigned long long lba
;
3660 sector_t sectors
, dev_max_sectors
;
3663 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3666 dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
3667 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
3669 WARN_ON(cmd
->data_length
% sector_size
);
3671 lba
= cmd
->t_task_lba
;
3672 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
3673 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
3676 * If we need just a single task reuse the SG list in the command
3677 * and avoid a lot of work.
3679 if (task_count
== 1) {
3680 struct se_task
*task
;
3681 unsigned long flags
;
3683 task
= transport_generic_get_task(cmd
, data_direction
);
3687 task
->task_sg
= cmd_sg
;
3688 task
->task_sg_nents
= sgl_nents
;
3690 task
->task_lba
= lba
;
3691 task
->task_sectors
= sectors
;
3692 task
->task_size
= task
->task_sectors
* sector_size
;
3694 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3695 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3696 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3701 for (i
= 0; i
< task_count
; i
++) {
3702 struct se_task
*task
;
3703 unsigned int task_size
, task_sg_nents_padded
;
3704 struct scatterlist
*sg
;
3705 unsigned long flags
;
3708 task
= transport_generic_get_task(cmd
, data_direction
);
3712 task
->task_lba
= lba
;
3713 task
->task_sectors
= min(sectors
, dev_max_sectors
);
3714 task
->task_size
= task
->task_sectors
* sector_size
;
3717 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3718 * in order to calculate the number per task SGL entries
3720 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
3722 * Check if the fabric module driver is requesting that all
3723 * struct se_task->task_sg[] be chained together.. If so,
3724 * then allocate an extra padding SG entry for linking and
3725 * marking the end of the chained SGL for every task except
3726 * the last one for (task_count > 1) operation, or skipping
3727 * the extra padding for the (task_count == 1) case.
3729 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
3730 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
3732 task_sg_nents_padded
= task
->task_sg_nents
;
3734 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
3735 task_sg_nents_padded
, GFP_KERNEL
);
3736 if (!task
->task_sg
) {
3737 cmd
->se_dev
->transport
->free_task(task
);
3741 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
3743 task_size
= task
->task_size
;
3745 /* Build new sgl, only up to task_size */
3746 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
3747 if (cmd_sg
->length
> task_size
)
3751 task_size
-= cmd_sg
->length
;
3752 cmd_sg
= sg_next(cmd_sg
);
3755 lba
+= task
->task_sectors
;
3756 sectors
-= task
->task_sectors
;
3758 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3759 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3760 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3767 transport_allocate_control_task(struct se_cmd
*cmd
)
3769 struct se_task
*task
;
3770 unsigned long flags
;
3772 /* Workaround for handling zero-length control CDBs */
3773 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3777 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
3781 task
->task_sg
= cmd
->t_data_sg
;
3782 task
->task_size
= cmd
->data_length
;
3783 task
->task_sg_nents
= cmd
->t_data_nents
;
3785 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3786 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3787 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3789 /* Success! Return number of tasks allocated */
3794 * Allocate any required ressources to execute the command, and either place
3795 * it on the execution queue if possible. For writes we might not have the
3796 * payload yet, thus notify the fabric via a call to ->write_pending instead.
3798 int transport_generic_new_cmd(struct se_cmd
*cmd
)
3800 struct se_device
*dev
= cmd
->se_dev
;
3801 int task_cdbs
, task_cdbs_bidi
= 0;
3806 * Determine is the TCM fabric module has already allocated physical
3807 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3810 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
3812 ret
= transport_generic_get_mem(cmd
);
3818 * For BIDI command set up the read tasks first.
3820 if (cmd
->t_bidi_data_sg
&&
3821 dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
3822 BUG_ON(!(cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
));
3824 task_cdbs_bidi
= transport_allocate_data_tasks(cmd
,
3825 DMA_FROM_DEVICE
, cmd
->t_bidi_data_sg
,
3826 cmd
->t_bidi_data_nents
);
3827 if (task_cdbs_bidi
<= 0)
3830 atomic_inc(&cmd
->t_fe_count
);
3831 atomic_inc(&cmd
->t_se_count
);
3835 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
3836 task_cdbs
= transport_allocate_data_tasks(cmd
,
3837 cmd
->data_direction
, cmd
->t_data_sg
,
3840 task_cdbs
= transport_allocate_control_task(cmd
);
3845 else if (!task_cdbs
&& (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)) {
3846 spin_lock_irq(&cmd
->t_state_lock
);
3847 cmd
->t_state
= TRANSPORT_COMPLETE
;
3848 cmd
->transport_state
|= CMD_T_ACTIVE
;
3849 spin_unlock_irq(&cmd
->t_state_lock
);
3851 if (cmd
->t_task_cdb
[0] == REQUEST_SENSE
) {
3852 u8 ua_asc
= 0, ua_ascq
= 0;
3854 core_scsi3_ua_clear_for_request_sense(cmd
,
3858 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
3859 queue_work(target_completion_wq
, &cmd
->work
);
3864 atomic_inc(&cmd
->t_fe_count
);
3865 atomic_inc(&cmd
->t_se_count
);
3868 cmd
->t_task_list_num
= (task_cdbs
+ task_cdbs_bidi
);
3869 atomic_set(&cmd
->t_task_cdbs_left
, cmd
->t_task_list_num
);
3870 atomic_set(&cmd
->t_task_cdbs_ex_left
, cmd
->t_task_list_num
);
3873 * For WRITEs, let the fabric know its buffer is ready..
3874 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3875 * will be added to the struct se_device execution queue after its WRITE
3876 * data has arrived. (ie: It gets handled by the transport processing
3877 * thread a second time)
3879 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3880 transport_add_tasks_to_state_queue(cmd
);
3881 return transport_generic_write_pending(cmd
);
3884 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3885 * to the execution queue.
3887 transport_execute_tasks(cmd
);
3891 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3892 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3895 EXPORT_SYMBOL(transport_generic_new_cmd
);
3897 /* transport_generic_process_write():
3901 void transport_generic_process_write(struct se_cmd
*cmd
)
3903 transport_execute_tasks(cmd
);
3905 EXPORT_SYMBOL(transport_generic_process_write
);
3907 static void transport_write_pending_qf(struct se_cmd
*cmd
)
3911 ret
= cmd
->se_tfo
->write_pending(cmd
);
3912 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
3913 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3915 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3919 static int transport_generic_write_pending(struct se_cmd
*cmd
)
3921 unsigned long flags
;
3924 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3925 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
3926 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3929 * Clear the se_cmd for WRITE_PENDING status in order to set
3930 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3931 * from HW target mode interrupt code. This is safe to be called
3932 * with transport_off=1 before the cmd->se_tfo->write_pending
3933 * because the se_cmd->se_lun pointer is not being cleared.
3935 transport_cmd_check_stop(cmd
, 1, 0);
3938 * Call the fabric write_pending function here to let the
3939 * frontend know that WRITE buffers are ready.
3941 ret
= cmd
->se_tfo
->write_pending(cmd
);
3942 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3950 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
3951 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
3952 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3956 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
3958 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
3959 if (wait_for_tasks
&& cmd
->se_tmr_req
)
3960 transport_wait_for_tasks(cmd
);
3962 transport_release_cmd(cmd
);
3965 transport_wait_for_tasks(cmd
);
3967 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
3970 transport_lun_remove_cmd(cmd
);
3972 transport_free_dev_tasks(cmd
);
3974 transport_put_cmd(cmd
);
3977 EXPORT_SYMBOL(transport_generic_free_cmd
);
3979 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3980 * @se_sess: session to reference
3981 * @se_cmd: command descriptor to add
3982 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
3984 void target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
3987 unsigned long flags
;
3989 kref_init(&se_cmd
->cmd_kref
);
3991 * Add a second kref if the fabric caller is expecting to handle
3992 * fabric acknowledgement that requires two target_put_sess_cmd()
3993 * invocations before se_cmd descriptor release.
3995 if (ack_kref
== true)
3996 kref_get(&se_cmd
->cmd_kref
);
3998 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3999 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
4000 se_cmd
->check_release
= 1;
4001 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4003 EXPORT_SYMBOL(target_get_sess_cmd
);
4005 static void target_release_cmd_kref(struct kref
*kref
)
4007 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
4008 struct se_session
*se_sess
= se_cmd
->se_sess
;
4009 unsigned long flags
;
4011 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
4012 if (list_empty(&se_cmd
->se_cmd_list
)) {
4013 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4017 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
4018 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4019 complete(&se_cmd
->cmd_wait_comp
);
4022 list_del(&se_cmd
->se_cmd_list
);
4023 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4025 se_cmd
->se_tfo
->release_cmd(se_cmd
);
4028 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4029 * @se_sess: session to reference
4030 * @se_cmd: command descriptor to drop
4032 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
4034 return kref_put(&se_cmd
->cmd_kref
, target_release_cmd_kref
);
4036 EXPORT_SYMBOL(target_put_sess_cmd
);
4038 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4039 * @se_sess: session to split
4041 void target_splice_sess_cmd_list(struct se_session
*se_sess
)
4043 struct se_cmd
*se_cmd
;
4044 unsigned long flags
;
4046 WARN_ON(!list_empty(&se_sess
->sess_wait_list
));
4047 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
4049 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
4050 se_sess
->sess_tearing_down
= 1;
4052 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
4054 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
4055 se_cmd
->cmd_wait_set
= 1;
4057 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4059 EXPORT_SYMBOL(target_splice_sess_cmd_list
);
4061 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4062 * @se_sess: session to wait for active I/O
4063 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4065 void target_wait_for_sess_cmds(
4066 struct se_session
*se_sess
,
4069 struct se_cmd
*se_cmd
, *tmp_cmd
;
4072 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
4073 &se_sess
->sess_wait_list
, se_cmd_list
) {
4074 list_del(&se_cmd
->se_cmd_list
);
4076 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4077 " %d\n", se_cmd
, se_cmd
->t_state
,
4078 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4080 if (wait_for_tasks
) {
4081 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4082 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4083 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4085 rc
= transport_wait_for_tasks(se_cmd
);
4087 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4088 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4089 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4093 wait_for_completion(&se_cmd
->cmd_wait_comp
);
4094 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4095 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4096 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4099 se_cmd
->se_tfo
->release_cmd(se_cmd
);
4102 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
4104 /* transport_lun_wait_for_tasks():
4106 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4107 * an struct se_lun to be successfully shutdown.
4109 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4111 unsigned long flags
;
4114 * If the frontend has already requested this struct se_cmd to
4115 * be stopped, we can safely ignore this struct se_cmd.
4117 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4118 if (cmd
->transport_state
& CMD_T_STOP
) {
4119 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
4121 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
4122 cmd
->se_tfo
->get_task_tag(cmd
));
4123 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4124 transport_cmd_check_stop(cmd
, 1, 0);
4127 cmd
->transport_state
|= CMD_T_LUN_FE_STOP
;
4128 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4130 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4132 ret
= transport_stop_tasks_for_cmd(cmd
);
4134 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4135 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4137 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4138 cmd
->se_tfo
->get_task_tag(cmd
));
4139 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4140 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4141 cmd
->se_tfo
->get_task_tag(cmd
));
4143 transport_remove_cmd_from_queue(cmd
);
4148 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4150 struct se_cmd
*cmd
= NULL
;
4151 unsigned long lun_flags
, cmd_flags
;
4153 * Do exception processing and return CHECK_CONDITION status to the
4156 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4157 while (!list_empty(&lun
->lun_cmd_list
)) {
4158 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4159 struct se_cmd
, se_lun_node
);
4160 list_del_init(&cmd
->se_lun_node
);
4163 * This will notify iscsi_target_transport.c:
4164 * transport_cmd_check_stop() that a LUN shutdown is in
4165 * progress for the iscsi_cmd_t.
4167 spin_lock(&cmd
->t_state_lock
);
4168 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4169 "_lun_stop for ITT: 0x%08x\n",
4170 cmd
->se_lun
->unpacked_lun
,
4171 cmd
->se_tfo
->get_task_tag(cmd
));
4172 cmd
->transport_state
|= CMD_T_LUN_STOP
;
4173 spin_unlock(&cmd
->t_state_lock
);
4175 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4178 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4179 cmd
->se_tfo
->get_task_tag(cmd
),
4180 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4184 * If the Storage engine still owns the iscsi_cmd_t, determine
4185 * and/or stop its context.
4187 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4188 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4189 cmd
->se_tfo
->get_task_tag(cmd
));
4191 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4192 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4196 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4197 "_wait_for_tasks(): SUCCESS\n",
4198 cmd
->se_lun
->unpacked_lun
,
4199 cmd
->se_tfo
->get_task_tag(cmd
));
4201 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4202 if (!(cmd
->transport_state
& CMD_T_DEV_ACTIVE
)) {
4203 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4206 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
4207 transport_all_task_dev_remove_state(cmd
);
4208 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4210 transport_free_dev_tasks(cmd
);
4212 * The Storage engine stopped this struct se_cmd before it was
4213 * send to the fabric frontend for delivery back to the
4214 * Initiator Node. Return this SCSI CDB back with an
4215 * CHECK_CONDITION status.
4218 transport_send_check_condition_and_sense(cmd
,
4219 TCM_NON_EXISTENT_LUN
, 0);
4221 * If the fabric frontend is waiting for this iscsi_cmd_t to
4222 * be released, notify the waiting thread now that LU has
4223 * finished accessing it.
4225 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4226 if (cmd
->transport_state
& CMD_T_LUN_FE_STOP
) {
4227 pr_debug("SE_LUN[%d] - Detected FE stop for"
4228 " struct se_cmd: %p ITT: 0x%08x\n",
4230 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4232 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4234 transport_cmd_check_stop(cmd
, 1, 0);
4235 complete(&cmd
->transport_lun_fe_stop_comp
);
4236 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4239 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4240 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4242 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4243 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4245 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4248 static int transport_clear_lun_thread(void *p
)
4250 struct se_lun
*lun
= p
;
4252 __transport_clear_lun_from_sessions(lun
);
4253 complete(&lun
->lun_shutdown_comp
);
4258 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4260 struct task_struct
*kt
;
4262 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4263 "tcm_cl_%u", lun
->unpacked_lun
);
4265 pr_err("Unable to start clear_lun thread\n");
4268 wait_for_completion(&lun
->lun_shutdown_comp
);
4274 * transport_wait_for_tasks - wait for completion to occur
4275 * @cmd: command to wait
4277 * Called from frontend fabric context to wait for storage engine
4278 * to pause and/or release frontend generated struct se_cmd.
4280 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
4282 unsigned long flags
;
4284 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4285 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
)) {
4286 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4290 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4291 * has been set in transport_set_supported_SAM_opcode().
4293 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) && !cmd
->se_tmr_req
) {
4294 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4298 * If we are already stopped due to an external event (ie: LUN shutdown)
4299 * sleep until the connection can have the passed struct se_cmd back.
4300 * The cmd->transport_lun_stopped_sem will be upped by
4301 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4302 * has completed its operation on the struct se_cmd.
4304 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
4305 pr_debug("wait_for_tasks: Stopping"
4306 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4307 "_stop_comp); for ITT: 0x%08x\n",
4308 cmd
->se_tfo
->get_task_tag(cmd
));
4310 * There is a special case for WRITES where a FE exception +
4311 * LUN shutdown means ConfigFS context is still sleeping on
4312 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4313 * We go ahead and up transport_lun_stop_comp just to be sure
4316 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4317 complete(&cmd
->transport_lun_stop_comp
);
4318 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4319 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4321 transport_all_task_dev_remove_state(cmd
);
4323 * At this point, the frontend who was the originator of this
4324 * struct se_cmd, now owns the structure and can be released through
4325 * normal means below.
4327 pr_debug("wait_for_tasks: Stopped"
4328 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4329 "stop_comp); for ITT: 0x%08x\n",
4330 cmd
->se_tfo
->get_task_tag(cmd
));
4332 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
4335 if (!(cmd
->transport_state
& CMD_T_ACTIVE
) ||
4336 (cmd
->transport_state
& CMD_T_ABORTED
)) {
4337 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4341 cmd
->transport_state
|= CMD_T_STOP
;
4343 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4344 " i_state: %d, t_state: %d, CMD_T_STOP\n",
4345 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4346 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4348 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4350 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4352 wait_for_completion(&cmd
->t_transport_stop_comp
);
4354 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4355 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
4357 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4358 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4359 cmd
->se_tfo
->get_task_tag(cmd
));
4361 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4365 EXPORT_SYMBOL(transport_wait_for_tasks
);
4367 static int transport_get_sense_codes(
4372 *asc
= cmd
->scsi_asc
;
4373 *ascq
= cmd
->scsi_ascq
;
4378 static int transport_set_sense_codes(
4383 cmd
->scsi_asc
= asc
;
4384 cmd
->scsi_ascq
= ascq
;
4389 int transport_send_check_condition_and_sense(
4394 unsigned char *buffer
= cmd
->sense_buffer
;
4395 unsigned long flags
;
4397 u8 asc
= 0, ascq
= 0;
4399 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4400 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4401 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4404 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4405 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4407 if (!reason
&& from_transport
)
4410 if (!from_transport
)
4411 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4413 * Data Segment and SenseLength of the fabric response PDU.
4415 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4416 * from include/scsi/scsi_cmnd.h
4418 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4419 TRANSPORT_SENSE_BUFFER
);
4421 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4422 * SENSE KEY values from include/scsi/scsi.h
4425 case TCM_NON_EXISTENT_LUN
:
4427 buffer
[offset
] = 0x70;
4428 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4429 /* ILLEGAL REQUEST */
4430 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4431 /* LOGICAL UNIT NOT SUPPORTED */
4432 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4434 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4435 case TCM_SECTOR_COUNT_TOO_MANY
:
4437 buffer
[offset
] = 0x70;
4438 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4439 /* ILLEGAL REQUEST */
4440 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4441 /* INVALID COMMAND OPERATION CODE */
4442 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4444 case TCM_UNKNOWN_MODE_PAGE
:
4446 buffer
[offset
] = 0x70;
4447 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4448 /* ILLEGAL REQUEST */
4449 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4450 /* INVALID FIELD IN CDB */
4451 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4453 case TCM_CHECK_CONDITION_ABORT_CMD
:
4455 buffer
[offset
] = 0x70;
4456 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4457 /* ABORTED COMMAND */
4458 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4459 /* BUS DEVICE RESET FUNCTION OCCURRED */
4460 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4461 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4463 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4465 buffer
[offset
] = 0x70;
4466 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4467 /* ABORTED COMMAND */
4468 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4470 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4471 /* NOT ENOUGH UNSOLICITED DATA */
4472 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4474 case TCM_INVALID_CDB_FIELD
:
4476 buffer
[offset
] = 0x70;
4477 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4478 /* ILLEGAL REQUEST */
4479 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4480 /* INVALID FIELD IN CDB */
4481 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4483 case TCM_INVALID_PARAMETER_LIST
:
4485 buffer
[offset
] = 0x70;
4486 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4487 /* ILLEGAL REQUEST */
4488 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4489 /* INVALID FIELD IN PARAMETER LIST */
4490 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4492 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4494 buffer
[offset
] = 0x70;
4495 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4496 /* ABORTED COMMAND */
4497 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4499 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4500 /* UNEXPECTED_UNSOLICITED_DATA */
4501 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4503 case TCM_SERVICE_CRC_ERROR
:
4505 buffer
[offset
] = 0x70;
4506 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4507 /* ABORTED COMMAND */
4508 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4509 /* PROTOCOL SERVICE CRC ERROR */
4510 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4512 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4514 case TCM_SNACK_REJECTED
:
4516 buffer
[offset
] = 0x70;
4517 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4518 /* ABORTED COMMAND */
4519 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4521 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4522 /* FAILED RETRANSMISSION REQUEST */
4523 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4525 case TCM_WRITE_PROTECTED
:
4527 buffer
[offset
] = 0x70;
4528 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4530 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4531 /* WRITE PROTECTED */
4532 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4534 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4536 buffer
[offset
] = 0x70;
4537 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4538 /* UNIT ATTENTION */
4539 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4540 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4541 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4542 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4544 case TCM_CHECK_CONDITION_NOT_READY
:
4546 buffer
[offset
] = 0x70;
4547 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4549 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4550 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4551 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4552 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4554 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4557 buffer
[offset
] = 0x70;
4558 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4559 /* ILLEGAL REQUEST */
4560 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4561 /* LOGICAL UNIT COMMUNICATION FAILURE */
4562 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4566 * This code uses linux/include/scsi/scsi.h SAM status codes!
4568 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4570 * Automatically padded, this value is encoded in the fabric's
4571 * data_length response PDU containing the SCSI defined sense data.
4573 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4576 return cmd
->se_tfo
->queue_status(cmd
);
4578 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4580 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4584 if (cmd
->transport_state
& CMD_T_ABORTED
) {
4586 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4589 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4590 " status for CDB: 0x%02x ITT: 0x%08x\n",
4592 cmd
->se_tfo
->get_task_tag(cmd
));
4594 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4595 cmd
->se_tfo
->queue_status(cmd
);
4600 EXPORT_SYMBOL(transport_check_aborted_status
);
4602 void transport_send_task_abort(struct se_cmd
*cmd
)
4604 unsigned long flags
;
4606 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4607 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4608 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4611 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4614 * If there are still expected incoming fabric WRITEs, we wait
4615 * until until they have completed before sending a TASK_ABORTED
4616 * response. This response with TASK_ABORTED status will be
4617 * queued back to fabric module by transport_check_aborted_status().
4619 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4620 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4621 cmd
->transport_state
|= CMD_T_ABORTED
;
4622 smp_mb__after_atomic_inc();
4625 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4627 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4628 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4629 cmd
->se_tfo
->get_task_tag(cmd
));
4631 cmd
->se_tfo
->queue_status(cmd
);
4634 static int transport_generic_do_tmr(struct se_cmd
*cmd
)
4636 struct se_device
*dev
= cmd
->se_dev
;
4637 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4640 switch (tmr
->function
) {
4641 case TMR_ABORT_TASK
:
4642 tmr
->response
= TMR_FUNCTION_REJECTED
;
4644 case TMR_ABORT_TASK_SET
:
4646 case TMR_CLEAR_TASK_SET
:
4647 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4650 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4651 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4652 TMR_FUNCTION_REJECTED
;
4654 case TMR_TARGET_WARM_RESET
:
4655 tmr
->response
= TMR_FUNCTION_REJECTED
;
4657 case TMR_TARGET_COLD_RESET
:
4658 tmr
->response
= TMR_FUNCTION_REJECTED
;
4661 pr_err("Uknown TMR function: 0x%02x.\n",
4663 tmr
->response
= TMR_FUNCTION_REJECTED
;
4667 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4668 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4670 transport_cmd_check_stop_to_fabric(cmd
);
4674 /* transport_processing_thread():
4678 static int transport_processing_thread(void *param
)
4682 struct se_device
*dev
= param
;
4684 while (!kthread_should_stop()) {
4685 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4686 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4687 kthread_should_stop());
4692 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4696 switch (cmd
->t_state
) {
4697 case TRANSPORT_NEW_CMD
:
4700 case TRANSPORT_NEW_CMD_MAP
:
4701 if (!cmd
->se_tfo
->new_cmd_map
) {
4702 pr_err("cmd->se_tfo->new_cmd_map is"
4703 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4706 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4708 transport_generic_request_failure(cmd
);
4711 ret
= transport_generic_new_cmd(cmd
);
4713 transport_generic_request_failure(cmd
);
4717 case TRANSPORT_PROCESS_WRITE
:
4718 transport_generic_process_write(cmd
);
4720 case TRANSPORT_PROCESS_TMR
:
4721 transport_generic_do_tmr(cmd
);
4723 case TRANSPORT_COMPLETE_QF_WP
:
4724 transport_write_pending_qf(cmd
);
4726 case TRANSPORT_COMPLETE_QF_OK
:
4727 transport_complete_qf(cmd
);
4730 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4731 "i_state: %d on SE LUN: %u\n",
4733 cmd
->se_tfo
->get_task_tag(cmd
),
4734 cmd
->se_tfo
->get_cmd_state(cmd
),
4735 cmd
->se_lun
->unpacked_lun
);
4743 WARN_ON(!list_empty(&dev
->state_task_list
));
4744 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4745 dev
->process_thread
= NULL
;