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 t_transport_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 (atomic_read(&cmd
->transport_lun_stop
)) {
459 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
460 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
461 cmd
->se_tfo
->get_task_tag(cmd
));
463 atomic_set(&cmd
->t_transport_active
, 0);
464 if (transport_off
== 2)
465 transport_all_task_dev_remove_state(cmd
);
466 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
468 complete(&cmd
->transport_lun_stop_comp
);
472 * Determine if frontend context caller is requesting the stopping of
473 * this command for frontend exceptions.
475 if (atomic_read(&cmd
->t_transport_stop
)) {
476 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
477 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
478 cmd
->se_tfo
->get_task_tag(cmd
));
480 if (transport_off
== 2)
481 transport_all_task_dev_remove_state(cmd
);
484 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
487 if (transport_off
== 2)
489 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
491 complete(&cmd
->t_transport_stop_comp
);
495 atomic_set(&cmd
->t_transport_active
, 0);
496 if (transport_off
== 2) {
497 transport_all_task_dev_remove_state(cmd
);
499 * Clear struct se_cmd->se_lun before the transport_off == 2
500 * handoff to fabric module.
504 * Some fabric modules like tcm_loop can release
505 * their internally allocated I/O reference now and
508 * Fabric modules are expected to return '1' here if the
509 * se_cmd being passed is released at this point,
510 * or zero if not being released.
512 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
513 spin_unlock_irqrestore(
514 &cmd
->t_state_lock
, flags
);
516 return cmd
->se_tfo
->check_stop_free(cmd
);
519 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
523 cmd
->t_state
= t_state
;
524 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
529 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
531 return transport_cmd_check_stop(cmd
, 2, 0);
534 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
536 struct se_lun
*lun
= cmd
->se_lun
;
542 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
543 if (!atomic_read(&cmd
->transport_dev_active
)) {
544 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
547 atomic_set(&cmd
->transport_dev_active
, 0);
548 transport_all_task_dev_remove_state(cmd
);
549 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
553 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
554 if (atomic_read(&cmd
->transport_lun_active
)) {
555 list_del(&cmd
->se_lun_node
);
556 atomic_set(&cmd
->transport_lun_active
, 0);
558 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
559 cmd
->se_tfo
->get_task_tag(cmd
), lun
->unpacked_lun
);
562 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
565 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
567 if (!cmd
->se_tmr_req
)
568 transport_lun_remove_cmd(cmd
);
570 if (transport_cmd_check_stop_to_fabric(cmd
))
573 transport_remove_cmd_from_queue(cmd
);
574 transport_put_cmd(cmd
);
578 static void transport_add_cmd_to_queue(struct se_cmd
*cmd
, int t_state
,
581 struct se_device
*dev
= cmd
->se_dev
;
582 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
586 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
587 cmd
->t_state
= t_state
;
588 atomic_set(&cmd
->t_transport_active
, 1);
589 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
592 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
594 /* If the cmd is already on the list, remove it before we add it */
595 if (!list_empty(&cmd
->se_queue_node
))
596 list_del(&cmd
->se_queue_node
);
598 atomic_inc(&qobj
->queue_cnt
);
601 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
603 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
604 atomic_set(&cmd
->t_transport_queue_active
, 1);
605 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
607 wake_up_interruptible(&qobj
->thread_wq
);
610 static struct se_cmd
*
611 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
616 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
617 if (list_empty(&qobj
->qobj_list
)) {
618 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
621 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
623 atomic_set(&cmd
->t_transport_queue_active
, 0);
625 list_del_init(&cmd
->se_queue_node
);
626 atomic_dec(&qobj
->queue_cnt
);
627 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
632 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
)
634 struct se_queue_obj
*qobj
= &cmd
->se_dev
->dev_queue_obj
;
637 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
638 if (!atomic_read(&cmd
->t_transport_queue_active
)) {
639 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
642 atomic_set(&cmd
->t_transport_queue_active
, 0);
643 atomic_dec(&qobj
->queue_cnt
);
644 list_del_init(&cmd
->se_queue_node
);
645 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
647 if (atomic_read(&cmd
->t_transport_queue_active
)) {
648 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
649 cmd
->se_tfo
->get_task_tag(cmd
),
650 atomic_read(&cmd
->t_transport_queue_active
));
655 * Completion function used by TCM subsystem plugins (such as FILEIO)
656 * for queueing up response from struct se_subsystem_api->do_task()
658 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
660 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
661 struct se_task
, t_list
);
664 cmd
->scsi_status
= SAM_STAT_GOOD
;
665 task
->task_scsi_status
= GOOD
;
667 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
668 task
->task_se_cmd
->scsi_sense_reason
=
669 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
673 transport_complete_task(task
, good
);
675 EXPORT_SYMBOL(transport_complete_sync_cache
);
677 static void target_complete_failure_work(struct work_struct
*work
)
679 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
681 transport_generic_request_failure(cmd
);
684 /* transport_complete_task():
686 * Called from interrupt and non interrupt context depending
687 * on the transport plugin.
689 void transport_complete_task(struct se_task
*task
, int success
)
691 struct se_cmd
*cmd
= task
->task_se_cmd
;
692 struct se_device
*dev
= cmd
->se_dev
;
695 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
696 task
->task_flags
&= ~TF_ACTIVE
;
699 * See if any sense data exists, if so set the TASK_SENSE flag.
700 * Also check for any other post completion work that needs to be
701 * done by the plugins.
703 if (dev
&& dev
->transport
->transport_complete
) {
704 if (dev
->transport
->transport_complete(task
) != 0) {
705 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
706 task
->task_flags
|= TF_HAS_SENSE
;
712 * See if we are waiting for outstanding struct se_task
713 * to complete for an exception condition
715 if (task
->task_flags
& TF_REQUEST_STOP
) {
716 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
717 complete(&task
->task_stop_comp
);
722 cmd
->t_tasks_failed
= 1;
725 * Decrement the outstanding t_task_cdbs_left count. The last
726 * struct se_task from struct se_cmd will complete itself into the
727 * device queue depending upon int success.
729 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
730 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
734 if (cmd
->t_tasks_failed
) {
735 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
736 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
738 atomic_set(&cmd
->t_transport_complete
, 1);
739 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
742 cmd
->t_state
= TRANSPORT_COMPLETE
;
743 atomic_set(&cmd
->t_transport_active
, 1);
744 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
746 queue_work(target_completion_wq
, &cmd
->work
);
748 EXPORT_SYMBOL(transport_complete_task
);
751 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
752 * struct se_task list are ready to be added to the active execution list
755 * Called with se_dev_t->execute_task_lock called.
757 static inline int transport_add_task_check_sam_attr(
758 struct se_task
*task
,
759 struct se_task
*task_prev
,
760 struct se_device
*dev
)
763 * No SAM Task attribute emulation enabled, add to tail of
766 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
767 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
771 * HEAD_OF_QUEUE attribute for received CDB, which means
772 * the first task that is associated with a struct se_cmd goes to
773 * head of the struct se_device->execute_task_list, and task_prev
774 * after that for each subsequent task
776 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
777 list_add(&task
->t_execute_list
,
778 (task_prev
!= NULL
) ?
779 &task_prev
->t_execute_list
:
780 &dev
->execute_task_list
);
782 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
783 " in execution queue\n",
784 task
->task_se_cmd
->t_task_cdb
[0]);
788 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
789 * transitioned from Dermant -> Active state, and are added to the end
790 * of the struct se_device->execute_task_list
792 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
796 /* __transport_add_task_to_execute_queue():
798 * Called with se_dev_t->execute_task_lock called.
800 static void __transport_add_task_to_execute_queue(
801 struct se_task
*task
,
802 struct se_task
*task_prev
,
803 struct se_device
*dev
)
807 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
808 atomic_inc(&dev
->execute_tasks
);
810 if (task
->t_state_active
)
813 * Determine if this task needs to go to HEAD_OF_QUEUE for the
814 * state list as well. Running with SAM Task Attribute emulation
815 * will always return head_of_queue == 0 here
818 list_add(&task
->t_state_list
, (task_prev
) ?
819 &task_prev
->t_state_list
:
820 &dev
->state_task_list
);
822 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
824 task
->t_state_active
= true;
826 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
827 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
831 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
833 struct se_device
*dev
= cmd
->se_dev
;
834 struct se_task
*task
;
837 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
838 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
839 spin_lock(&dev
->execute_task_lock
);
840 if (!task
->t_state_active
) {
841 list_add_tail(&task
->t_state_list
,
842 &dev
->state_task_list
);
843 task
->t_state_active
= true;
845 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
846 task
->task_se_cmd
->se_tfo
->get_task_tag(
847 task
->task_se_cmd
), task
, dev
);
849 spin_unlock(&dev
->execute_task_lock
);
851 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
854 static void __transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
856 struct se_device
*dev
= cmd
->se_dev
;
857 struct se_task
*task
, *task_prev
= NULL
;
859 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
860 if (!list_empty(&task
->t_execute_list
))
863 * __transport_add_task_to_execute_queue() handles the
864 * SAM Task Attribute emulation if enabled
866 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
871 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
874 struct se_device
*dev
= cmd
->se_dev
;
876 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
877 __transport_add_tasks_from_cmd(cmd
);
878 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
881 void __transport_remove_task_from_execute_queue(struct se_task
*task
,
882 struct se_device
*dev
)
884 list_del_init(&task
->t_execute_list
);
885 atomic_dec(&dev
->execute_tasks
);
888 static void transport_remove_task_from_execute_queue(
889 struct se_task
*task
,
890 struct se_device
*dev
)
894 if (WARN_ON(list_empty(&task
->t_execute_list
)))
897 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
898 __transport_remove_task_from_execute_queue(task
, dev
);
899 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
903 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
906 static void target_qf_do_work(struct work_struct
*work
)
908 struct se_device
*dev
= container_of(work
, struct se_device
,
910 LIST_HEAD(qf_cmd_list
);
911 struct se_cmd
*cmd
, *cmd_tmp
;
913 spin_lock_irq(&dev
->qf_cmd_lock
);
914 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
915 spin_unlock_irq(&dev
->qf_cmd_lock
);
917 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
918 list_del(&cmd
->se_qf_node
);
919 atomic_dec(&dev
->dev_qf_count
);
920 smp_mb__after_atomic_dec();
922 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
923 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
924 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
925 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
928 transport_add_cmd_to_queue(cmd
, cmd
->t_state
, true);
932 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
934 switch (cmd
->data_direction
) {
937 case DMA_FROM_DEVICE
:
941 case DMA_BIDIRECTIONAL
:
950 void transport_dump_dev_state(
951 struct se_device
*dev
,
955 *bl
+= sprintf(b
+ *bl
, "Status: ");
956 switch (dev
->dev_status
) {
957 case TRANSPORT_DEVICE_ACTIVATED
:
958 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
960 case TRANSPORT_DEVICE_DEACTIVATED
:
961 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
963 case TRANSPORT_DEVICE_SHUTDOWN
:
964 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
966 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
967 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
968 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
971 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
975 *bl
+= sprintf(b
+ *bl
, " Execute/Max Queue Depth: %d/%d",
976 atomic_read(&dev
->execute_tasks
), dev
->queue_depth
);
977 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
978 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
979 *bl
+= sprintf(b
+ *bl
, " ");
982 void transport_dump_vpd_proto_id(
984 unsigned char *p_buf
,
987 unsigned char buf
[VPD_TMP_BUF_SIZE
];
990 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
991 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
993 switch (vpd
->protocol_identifier
) {
995 sprintf(buf
+len
, "Fibre Channel\n");
998 sprintf(buf
+len
, "Parallel SCSI\n");
1001 sprintf(buf
+len
, "SSA\n");
1004 sprintf(buf
+len
, "IEEE 1394\n");
1007 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1011 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1014 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1017 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1021 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1024 sprintf(buf
+len
, "Unknown 0x%02x\n",
1025 vpd
->protocol_identifier
);
1030 strncpy(p_buf
, buf
, p_buf_len
);
1032 pr_debug("%s", buf
);
1036 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1039 * Check if the Protocol Identifier Valid (PIV) bit is set..
1041 * from spc3r23.pdf section 7.5.1
1043 if (page_83
[1] & 0x80) {
1044 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1045 vpd
->protocol_identifier_set
= 1;
1046 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1049 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1051 int transport_dump_vpd_assoc(
1052 struct t10_vpd
*vpd
,
1053 unsigned char *p_buf
,
1056 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1060 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1061 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1063 switch (vpd
->association
) {
1065 sprintf(buf
+len
, "addressed logical unit\n");
1068 sprintf(buf
+len
, "target port\n");
1071 sprintf(buf
+len
, "SCSI target device\n");
1074 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1080 strncpy(p_buf
, buf
, p_buf_len
);
1082 pr_debug("%s", buf
);
1087 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1090 * The VPD identification association..
1092 * from spc3r23.pdf Section 7.6.3.1 Table 297
1094 vpd
->association
= (page_83
[1] & 0x30);
1095 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1097 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1099 int transport_dump_vpd_ident_type(
1100 struct t10_vpd
*vpd
,
1101 unsigned char *p_buf
,
1104 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1108 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1109 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1111 switch (vpd
->device_identifier_type
) {
1113 sprintf(buf
+len
, "Vendor specific\n");
1116 sprintf(buf
+len
, "T10 Vendor ID based\n");
1119 sprintf(buf
+len
, "EUI-64 based\n");
1122 sprintf(buf
+len
, "NAA\n");
1125 sprintf(buf
+len
, "Relative target port identifier\n");
1128 sprintf(buf
+len
, "SCSI name string\n");
1131 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1132 vpd
->device_identifier_type
);
1138 if (p_buf_len
< strlen(buf
)+1)
1140 strncpy(p_buf
, buf
, p_buf_len
);
1142 pr_debug("%s", buf
);
1148 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1151 * The VPD identifier type..
1153 * from spc3r23.pdf Section 7.6.3.1 Table 298
1155 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1156 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1158 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1160 int transport_dump_vpd_ident(
1161 struct t10_vpd
*vpd
,
1162 unsigned char *p_buf
,
1165 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1168 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1170 switch (vpd
->device_identifier_code_set
) {
1171 case 0x01: /* Binary */
1172 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1173 &vpd
->device_identifier
[0]);
1175 case 0x02: /* ASCII */
1176 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1177 &vpd
->device_identifier
[0]);
1179 case 0x03: /* UTF-8 */
1180 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1181 &vpd
->device_identifier
[0]);
1184 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1185 " 0x%02x", vpd
->device_identifier_code_set
);
1191 strncpy(p_buf
, buf
, p_buf_len
);
1193 pr_debug("%s", buf
);
1199 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1201 static const char hex_str
[] = "0123456789abcdef";
1202 int j
= 0, i
= 4; /* offset to start of the identifer */
1205 * The VPD Code Set (encoding)
1207 * from spc3r23.pdf Section 7.6.3.1 Table 296
1209 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1210 switch (vpd
->device_identifier_code_set
) {
1211 case 0x01: /* Binary */
1212 vpd
->device_identifier
[j
++] =
1213 hex_str
[vpd
->device_identifier_type
];
1214 while (i
< (4 + page_83
[3])) {
1215 vpd
->device_identifier
[j
++] =
1216 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1217 vpd
->device_identifier
[j
++] =
1218 hex_str
[page_83
[i
] & 0x0f];
1222 case 0x02: /* ASCII */
1223 case 0x03: /* UTF-8 */
1224 while (i
< (4 + page_83
[3]))
1225 vpd
->device_identifier
[j
++] = page_83
[i
++];
1231 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1233 EXPORT_SYMBOL(transport_set_vpd_ident
);
1235 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1238 * If this device is from Target_Core_Mod/pSCSI, disable the
1239 * SAM Task Attribute emulation.
1241 * This is currently not available in upsream Linux/SCSI Target
1242 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1244 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1245 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1249 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1250 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1251 " device\n", dev
->transport
->name
,
1252 dev
->transport
->get_device_rev(dev
));
1255 static void scsi_dump_inquiry(struct se_device
*dev
)
1257 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1261 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1263 for (i
= 0; i
< 8; i
++)
1264 if (wwn
->vendor
[i
] >= 0x20)
1265 buf
[i
] = wwn
->vendor
[i
];
1269 pr_debug(" Vendor: %s\n", buf
);
1271 for (i
= 0; i
< 16; i
++)
1272 if (wwn
->model
[i
] >= 0x20)
1273 buf
[i
] = wwn
->model
[i
];
1277 pr_debug(" Model: %s\n", buf
);
1279 for (i
= 0; i
< 4; i
++)
1280 if (wwn
->revision
[i
] >= 0x20)
1281 buf
[i
] = wwn
->revision
[i
];
1285 pr_debug(" Revision: %s\n", buf
);
1287 device_type
= dev
->transport
->get_device_type(dev
);
1288 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1289 pr_debug(" ANSI SCSI revision: %02x\n",
1290 dev
->transport
->get_device_rev(dev
));
1293 struct se_device
*transport_add_device_to_core_hba(
1295 struct se_subsystem_api
*transport
,
1296 struct se_subsystem_dev
*se_dev
,
1298 void *transport_dev
,
1299 struct se_dev_limits
*dev_limits
,
1300 const char *inquiry_prod
,
1301 const char *inquiry_rev
)
1304 struct se_device
*dev
;
1306 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1308 pr_err("Unable to allocate memory for se_dev_t\n");
1312 transport_init_queue_obj(&dev
->dev_queue_obj
);
1313 dev
->dev_flags
= device_flags
;
1314 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1315 dev
->dev_ptr
= transport_dev
;
1317 dev
->se_sub_dev
= se_dev
;
1318 dev
->transport
= transport
;
1319 INIT_LIST_HEAD(&dev
->dev_list
);
1320 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1321 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1322 INIT_LIST_HEAD(&dev
->execute_task_list
);
1323 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1324 INIT_LIST_HEAD(&dev
->state_task_list
);
1325 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1326 spin_lock_init(&dev
->execute_task_lock
);
1327 spin_lock_init(&dev
->delayed_cmd_lock
);
1328 spin_lock_init(&dev
->dev_reservation_lock
);
1329 spin_lock_init(&dev
->dev_status_lock
);
1330 spin_lock_init(&dev
->se_port_lock
);
1331 spin_lock_init(&dev
->se_tmr_lock
);
1332 spin_lock_init(&dev
->qf_cmd_lock
);
1333 atomic_set(&dev
->dev_ordered_id
, 0);
1335 se_dev_set_default_attribs(dev
, dev_limits
);
1337 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1338 dev
->creation_time
= get_jiffies_64();
1339 spin_lock_init(&dev
->stats_lock
);
1341 spin_lock(&hba
->device_lock
);
1342 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1344 spin_unlock(&hba
->device_lock
);
1346 * Setup the SAM Task Attribute emulation for struct se_device
1348 core_setup_task_attr_emulation(dev
);
1350 * Force PR and ALUA passthrough emulation with internal object use.
1352 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1354 * Setup the Reservations infrastructure for struct se_device
1356 core_setup_reservations(dev
, force_pt
);
1358 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1360 if (core_setup_alua(dev
, force_pt
) < 0)
1364 * Startup the struct se_device processing thread
1366 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1367 "LIO_%s", dev
->transport
->name
);
1368 if (IS_ERR(dev
->process_thread
)) {
1369 pr_err("Unable to create kthread: LIO_%s\n",
1370 dev
->transport
->name
);
1374 * Setup work_queue for QUEUE_FULL
1376 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1378 * Preload the initial INQUIRY const values if we are doing
1379 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1380 * passthrough because this is being provided by the backend LLD.
1381 * This is required so that transport_get_inquiry() copies these
1382 * originals once back into DEV_T10_WWN(dev) for the virtual device
1385 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1386 if (!inquiry_prod
|| !inquiry_rev
) {
1387 pr_err("All non TCM/pSCSI plugins require"
1388 " INQUIRY consts\n");
1392 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1393 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1394 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1396 scsi_dump_inquiry(dev
);
1400 kthread_stop(dev
->process_thread
);
1402 spin_lock(&hba
->device_lock
);
1403 list_del(&dev
->dev_list
);
1405 spin_unlock(&hba
->device_lock
);
1407 se_release_vpd_for_dev(dev
);
1413 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1415 /* transport_generic_prepare_cdb():
1417 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1418 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1419 * The point of this is since we are mapping iSCSI LUNs to
1420 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1421 * devices and HBAs for a loop.
1423 static inline void transport_generic_prepare_cdb(
1427 case READ_10
: /* SBC - RDProtect */
1428 case READ_12
: /* SBC - RDProtect */
1429 case READ_16
: /* SBC - RDProtect */
1430 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1431 case VERIFY
: /* SBC - VRProtect */
1432 case VERIFY_16
: /* SBC - VRProtect */
1433 case WRITE_VERIFY
: /* SBC - VRProtect */
1434 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1437 cdb
[1] &= 0x1f; /* clear logical unit number */
1442 static struct se_task
*
1443 transport_generic_get_task(struct se_cmd
*cmd
,
1444 enum dma_data_direction data_direction
)
1446 struct se_task
*task
;
1447 struct se_device
*dev
= cmd
->se_dev
;
1449 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1451 pr_err("Unable to allocate struct se_task\n");
1455 INIT_LIST_HEAD(&task
->t_list
);
1456 INIT_LIST_HEAD(&task
->t_execute_list
);
1457 INIT_LIST_HEAD(&task
->t_state_list
);
1458 init_completion(&task
->task_stop_comp
);
1459 task
->task_se_cmd
= cmd
;
1460 task
->task_data_direction
= data_direction
;
1465 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1468 * Used by fabric modules containing a local struct se_cmd within their
1469 * fabric dependent per I/O descriptor.
1471 void transport_init_se_cmd(
1473 struct target_core_fabric_ops
*tfo
,
1474 struct se_session
*se_sess
,
1478 unsigned char *sense_buffer
)
1480 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1481 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1482 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1483 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1484 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1485 INIT_LIST_HEAD(&cmd
->t_task_list
);
1486 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1487 init_completion(&cmd
->transport_lun_stop_comp
);
1488 init_completion(&cmd
->t_transport_stop_comp
);
1489 init_completion(&cmd
->cmd_wait_comp
);
1490 spin_lock_init(&cmd
->t_state_lock
);
1491 atomic_set(&cmd
->transport_dev_active
, 1);
1494 cmd
->se_sess
= se_sess
;
1495 cmd
->data_length
= data_length
;
1496 cmd
->data_direction
= data_direction
;
1497 cmd
->sam_task_attr
= task_attr
;
1498 cmd
->sense_buffer
= sense_buffer
;
1500 EXPORT_SYMBOL(transport_init_se_cmd
);
1502 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1505 * Check if SAM Task Attribute emulation is enabled for this
1506 * struct se_device storage object
1508 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1511 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1512 pr_debug("SAM Task Attribute ACA"
1513 " emulation is not supported\n");
1517 * Used to determine when ORDERED commands should go from
1518 * Dormant to Active status.
1520 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1521 smp_mb__after_atomic_inc();
1522 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1523 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1524 cmd
->se_dev
->transport
->name
);
1528 /* transport_generic_allocate_tasks():
1530 * Called from fabric RX Thread.
1532 int transport_generic_allocate_tasks(
1538 transport_generic_prepare_cdb(cdb
);
1540 * Ensure that the received CDB is less than the max (252 + 8) bytes
1541 * for VARIABLE_LENGTH_CMD
1543 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1544 pr_err("Received SCSI CDB with command_size: %d that"
1545 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1546 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1547 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1548 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1552 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1553 * allocate the additional extended CDB buffer now.. Otherwise
1554 * setup the pointer from __t_task_cdb to t_task_cdb.
1556 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1557 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1559 if (!cmd
->t_task_cdb
) {
1560 pr_err("Unable to allocate cmd->t_task_cdb"
1561 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1562 scsi_command_size(cdb
),
1563 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1564 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1565 cmd
->scsi_sense_reason
=
1566 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1570 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1572 * Copy the original CDB into cmd->
1574 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1576 * Setup the received CDB based on SCSI defined opcodes and
1577 * perform unit attention, persistent reservations and ALUA
1578 * checks for virtual device backends. The cmd->t_task_cdb
1579 * pointer is expected to be setup before we reach this point.
1581 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1585 * Check for SAM Task Attribute Emulation
1587 if (transport_check_alloc_task_attr(cmd
) < 0) {
1588 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1589 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1592 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1593 if (cmd
->se_lun
->lun_sep
)
1594 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1595 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1598 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1601 * Used by fabric module frontends to queue tasks directly.
1602 * Many only be used from process context only
1604 int transport_handle_cdb_direct(
1611 pr_err("cmd->se_lun is NULL\n");
1614 if (in_interrupt()) {
1616 pr_err("transport_generic_handle_cdb cannot be called"
1617 " from interrupt context\n");
1621 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1622 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1623 * in existing usage to ensure that outstanding descriptors are handled
1624 * correctly during shutdown via transport_wait_for_tasks()
1626 * Also, we don't take cmd->t_state_lock here as we only expect
1627 * this to be called for initial descriptor submission.
1629 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1630 atomic_set(&cmd
->t_transport_active
, 1);
1632 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1633 * so follow TRANSPORT_NEW_CMD processing thread context usage
1634 * and call transport_generic_request_failure() if necessary..
1636 ret
= transport_generic_new_cmd(cmd
);
1638 transport_generic_request_failure(cmd
);
1642 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1645 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1647 * @se_cmd: command descriptor to submit
1648 * @se_sess: associated se_sess for endpoint
1649 * @cdb: pointer to SCSI CDB
1650 * @sense: pointer to SCSI sense buffer
1651 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1652 * @data_length: fabric expected data transfer length
1653 * @task_addr: SAM task attribute
1654 * @data_dir: DMA data direction
1655 * @flags: flags for command submission from target_sc_flags_tables
1657 * This may only be called from process context, and also currently
1658 * assumes internal allocation of fabric payload buffer by target-core.
1660 void target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1661 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1662 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1664 struct se_portal_group
*se_tpg
;
1667 se_tpg
= se_sess
->se_tpg
;
1669 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1670 BUG_ON(in_interrupt());
1672 * Initialize se_cmd for target operation. From this point
1673 * exceptions are handled by sending exception status via
1674 * target_core_fabric_ops->queue_status() callback
1676 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1677 data_length
, data_dir
, task_attr
, sense
);
1679 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1680 * se_sess->sess_cmd_list. A second kref_get here is necessary
1681 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1682 * kref_put() to happen during fabric packet acknowledgement.
1684 target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1686 * Signal bidirectional data payloads to target-core
1688 if (flags
& TARGET_SCF_BIDI_OP
)
1689 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1691 * Locate se_lun pointer and attach it to struct se_cmd
1693 if (transport_lookup_cmd_lun(se_cmd
, unpacked_lun
) < 0) {
1694 transport_send_check_condition_and_sense(se_cmd
,
1695 se_cmd
->scsi_sense_reason
, 0);
1696 target_put_sess_cmd(se_sess
, se_cmd
);
1700 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1701 * allocate the necessary tasks to complete the received CDB+data
1703 rc
= transport_generic_allocate_tasks(se_cmd
, cdb
);
1705 transport_generic_request_failure(se_cmd
);
1709 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1710 * for immediate execution of READs, otherwise wait for
1711 * transport_generic_handle_data() to be called for WRITEs
1712 * when fabric has filled the incoming buffer.
1714 transport_handle_cdb_direct(se_cmd
);
1717 EXPORT_SYMBOL(target_submit_cmd
);
1720 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1721 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1722 * complete setup in TCM process context w/ TFO->new_cmd_map().
1724 int transport_generic_handle_cdb_map(
1729 pr_err("cmd->se_lun is NULL\n");
1733 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
, false);
1736 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1738 /* transport_generic_handle_data():
1742 int transport_generic_handle_data(
1746 * For the software fabric case, then we assume the nexus is being
1747 * failed/shutdown when signals are pending from the kthread context
1748 * caller, so we return a failure. For the HW target mode case running
1749 * in interrupt code, the signal_pending() check is skipped.
1751 if (!in_interrupt() && signal_pending(current
))
1754 * If the received CDB has aleady been ABORTED by the generic
1755 * target engine, we now call transport_check_aborted_status()
1756 * to queue any delated TASK_ABORTED status for the received CDB to the
1757 * fabric module as we are expecting no further incoming DATA OUT
1758 * sequences at this point.
1760 if (transport_check_aborted_status(cmd
, 1) != 0)
1763 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
, false);
1766 EXPORT_SYMBOL(transport_generic_handle_data
);
1768 /* transport_generic_handle_tmr():
1772 int transport_generic_handle_tmr(
1775 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
, false);
1778 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1781 * If the task is active, request it to be stopped and sleep until it
1784 bool target_stop_task(struct se_task
*task
, unsigned long *flags
)
1786 struct se_cmd
*cmd
= task
->task_se_cmd
;
1787 bool was_active
= false;
1789 if (task
->task_flags
& TF_ACTIVE
) {
1790 task
->task_flags
|= TF_REQUEST_STOP
;
1791 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1793 pr_debug("Task %p waiting to complete\n", task
);
1794 wait_for_completion(&task
->task_stop_comp
);
1795 pr_debug("Task %p stopped successfully\n", task
);
1797 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1798 atomic_dec(&cmd
->t_task_cdbs_left
);
1799 task
->task_flags
&= ~(TF_ACTIVE
| TF_REQUEST_STOP
);
1806 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1808 struct se_task
*task
, *task_tmp
;
1809 unsigned long flags
;
1812 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1813 cmd
->se_tfo
->get_task_tag(cmd
));
1816 * No tasks remain in the execution queue
1818 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1819 list_for_each_entry_safe(task
, task_tmp
,
1820 &cmd
->t_task_list
, t_list
) {
1821 pr_debug("Processing task %p\n", task
);
1823 * If the struct se_task has not been sent and is not active,
1824 * remove the struct se_task from the execution queue.
1826 if (!(task
->task_flags
& (TF_ACTIVE
| TF_SENT
))) {
1827 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1829 transport_remove_task_from_execute_queue(task
,
1832 pr_debug("Task %p removed from execute queue\n", task
);
1833 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1837 if (!target_stop_task(task
, &flags
)) {
1838 pr_debug("Task %p - did nothing\n", task
);
1842 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1848 * Handle SAM-esque emulation for generic transport request failures.
1850 static void transport_generic_request_failure(struct se_cmd
*cmd
)
1854 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1855 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1856 cmd
->t_task_cdb
[0]);
1857 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1858 cmd
->se_tfo
->get_cmd_state(cmd
),
1859 cmd
->t_state
, cmd
->scsi_sense_reason
);
1860 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1861 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1862 " t_transport_active: %d t_transport_stop: %d"
1863 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1864 atomic_read(&cmd
->t_task_cdbs_left
),
1865 atomic_read(&cmd
->t_task_cdbs_sent
),
1866 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1867 atomic_read(&cmd
->t_transport_active
),
1868 atomic_read(&cmd
->t_transport_stop
),
1869 atomic_read(&cmd
->t_transport_sent
));
1872 * For SAM Task Attribute emulation for failed struct se_cmd
1874 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1875 transport_complete_task_attr(cmd
);
1877 switch (cmd
->scsi_sense_reason
) {
1878 case TCM_NON_EXISTENT_LUN
:
1879 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1880 case TCM_INVALID_CDB_FIELD
:
1881 case TCM_INVALID_PARAMETER_LIST
:
1882 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1883 case TCM_UNKNOWN_MODE_PAGE
:
1884 case TCM_WRITE_PROTECTED
:
1885 case TCM_CHECK_CONDITION_ABORT_CMD
:
1886 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1887 case TCM_CHECK_CONDITION_NOT_READY
:
1889 case TCM_RESERVATION_CONFLICT
:
1891 * No SENSE Data payload for this case, set SCSI Status
1892 * and queue the response to $FABRIC_MOD.
1894 * Uses linux/include/scsi/scsi.h SAM status codes defs
1896 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1898 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1899 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1902 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1905 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1906 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1907 cmd
->orig_fe_lun
, 0x2C,
1908 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1910 ret
= cmd
->se_tfo
->queue_status(cmd
);
1911 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1915 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1916 cmd
->t_task_cdb
[0], cmd
->scsi_sense_reason
);
1917 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1921 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1922 * make the call to transport_send_check_condition_and_sense()
1923 * directly. Otherwise expect the fabric to make the call to
1924 * transport_send_check_condition_and_sense() after handling
1925 * possible unsoliticied write data payloads.
1927 ret
= transport_send_check_condition_and_sense(cmd
,
1928 cmd
->scsi_sense_reason
, 0);
1929 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1933 transport_lun_remove_cmd(cmd
);
1934 if (!transport_cmd_check_stop_to_fabric(cmd
))
1939 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1940 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1943 static inline u32
transport_lba_21(unsigned char *cdb
)
1945 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
1948 static inline u32
transport_lba_32(unsigned char *cdb
)
1950 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1953 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
1955 unsigned int __v1
, __v2
;
1957 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1958 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1960 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1964 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1966 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
1968 unsigned int __v1
, __v2
;
1970 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
1971 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
1973 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1976 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
1978 unsigned long flags
;
1980 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
1981 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1982 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
1986 * Called from Fabric Module context from transport_execute_tasks()
1988 * The return of this function determins if the tasks from struct se_cmd
1989 * get added to the execution queue in transport_execute_tasks(),
1990 * or are added to the delayed or ordered lists here.
1992 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
1994 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1997 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1998 * to allow the passed struct se_cmd list of tasks to the front of the list.
2000 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2001 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2002 " 0x%02x, se_ordered_id: %u\n",
2004 cmd
->se_ordered_id
);
2006 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2007 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2008 smp_mb__after_atomic_inc();
2010 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2011 " list, se_ordered_id: %u\n",
2013 cmd
->se_ordered_id
);
2015 * Add ORDERED command to tail of execution queue if
2016 * no other older commands exist that need to be
2019 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2023 * For SIMPLE and UNTAGGED Task Attribute commands
2025 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2026 smp_mb__after_atomic_inc();
2029 * Otherwise if one or more outstanding ORDERED task attribute exist,
2030 * add the dormant task(s) built for the passed struct se_cmd to the
2031 * execution queue and become in Active state for this struct se_device.
2033 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2035 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2036 * will be drained upon completion of HEAD_OF_QUEUE task.
2038 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2039 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2040 list_add_tail(&cmd
->se_delayed_node
,
2041 &cmd
->se_dev
->delayed_cmd_list
);
2042 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2044 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2045 " delayed CMD list, se_ordered_id: %u\n",
2046 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2047 cmd
->se_ordered_id
);
2049 * Return zero to let transport_execute_tasks() know
2050 * not to add the delayed tasks to the execution list.
2055 * Otherwise, no ORDERED task attributes exist..
2061 * Called from fabric module context in transport_generic_new_cmd() and
2062 * transport_generic_process_write()
2064 static int transport_execute_tasks(struct se_cmd
*cmd
)
2067 struct se_device
*se_dev
= cmd
->se_dev
;
2069 * Call transport_cmd_check_stop() to see if a fabric exception
2070 * has occurred that prevents execution.
2072 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2074 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2075 * attribute for the tasks of the received struct se_cmd CDB
2077 add_tasks
= transport_execute_task_attr(cmd
);
2081 * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2082 * adds associated se_tasks while holding dev->execute_task_lock
2083 * before I/O dispath to avoid a double spinlock access.
2085 __transport_execute_tasks(se_dev
, cmd
);
2090 __transport_execute_tasks(se_dev
, NULL
);
2095 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2096 * from struct se_device->execute_task_list and
2098 * Called from transport_processing_thread()
2100 static int __transport_execute_tasks(struct se_device
*dev
, struct se_cmd
*new_cmd
)
2103 struct se_cmd
*cmd
= NULL
;
2104 struct se_task
*task
= NULL
;
2105 unsigned long flags
;
2108 spin_lock_irq(&dev
->execute_task_lock
);
2109 if (new_cmd
!= NULL
)
2110 __transport_add_tasks_from_cmd(new_cmd
);
2112 if (list_empty(&dev
->execute_task_list
)) {
2113 spin_unlock_irq(&dev
->execute_task_lock
);
2116 task
= list_first_entry(&dev
->execute_task_list
,
2117 struct se_task
, t_execute_list
);
2118 __transport_remove_task_from_execute_queue(task
, dev
);
2119 spin_unlock_irq(&dev
->execute_task_lock
);
2121 cmd
= task
->task_se_cmd
;
2122 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2123 task
->task_flags
|= (TF_ACTIVE
| TF_SENT
);
2124 atomic_inc(&cmd
->t_task_cdbs_sent
);
2126 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2127 cmd
->t_task_list_num
)
2128 atomic_set(&cmd
->t_transport_sent
, 1);
2130 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2132 if (cmd
->execute_task
)
2133 error
= cmd
->execute_task(task
);
2135 error
= dev
->transport
->do_task(task
);
2137 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2138 task
->task_flags
&= ~TF_ACTIVE
;
2139 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2140 atomic_set(&cmd
->t_transport_sent
, 0);
2141 transport_stop_tasks_for_cmd(cmd
);
2142 transport_generic_request_failure(cmd
);
2151 static inline u32
transport_get_sectors_6(
2156 struct se_device
*dev
= cmd
->se_dev
;
2159 * Assume TYPE_DISK for non struct se_device objects.
2160 * Use 8-bit sector value.
2166 * Use 24-bit allocation length for TYPE_TAPE.
2168 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2169 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2172 * Everything else assume TYPE_DISK Sector CDB location.
2173 * Use 8-bit sector value. SBC-3 says:
2175 * A TRANSFER LENGTH field set to zero specifies that 256
2176 * logical blocks shall be written. Any other value
2177 * specifies the number of logical blocks that shall be
2181 return cdb
[4] ? : 256;
2184 static inline u32
transport_get_sectors_10(
2189 struct se_device
*dev
= cmd
->se_dev
;
2192 * Assume TYPE_DISK for non struct se_device objects.
2193 * Use 16-bit sector value.
2199 * XXX_10 is not defined in SSC, throw an exception
2201 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2207 * Everything else assume TYPE_DISK Sector CDB location.
2208 * Use 16-bit sector value.
2211 return (u32
)(cdb
[7] << 8) + cdb
[8];
2214 static inline u32
transport_get_sectors_12(
2219 struct se_device
*dev
= cmd
->se_dev
;
2222 * Assume TYPE_DISK for non struct se_device objects.
2223 * Use 32-bit sector value.
2229 * XXX_12 is not defined in SSC, throw an exception
2231 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2237 * Everything else assume TYPE_DISK Sector CDB location.
2238 * Use 32-bit sector value.
2241 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2244 static inline u32
transport_get_sectors_16(
2249 struct se_device
*dev
= cmd
->se_dev
;
2252 * Assume TYPE_DISK for non struct se_device objects.
2253 * Use 32-bit sector value.
2259 * Use 24-bit allocation length for TYPE_TAPE.
2261 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2262 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2265 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2266 (cdb
[12] << 8) + cdb
[13];
2270 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2272 static inline u32
transport_get_sectors_32(
2278 * Assume TYPE_DISK for non struct se_device objects.
2279 * Use 32-bit sector value.
2281 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2282 (cdb
[30] << 8) + cdb
[31];
2286 static inline u32
transport_get_size(
2291 struct se_device
*dev
= cmd
->se_dev
;
2293 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2294 if (cdb
[1] & 1) { /* sectors */
2295 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2300 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2301 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2302 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2303 dev
->transport
->name
);
2305 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2308 static void transport_xor_callback(struct se_cmd
*cmd
)
2310 unsigned char *buf
, *addr
;
2311 struct scatterlist
*sg
;
2312 unsigned int offset
;
2316 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2318 * 1) read the specified logical block(s);
2319 * 2) transfer logical blocks from the data-out buffer;
2320 * 3) XOR the logical blocks transferred from the data-out buffer with
2321 * the logical blocks read, storing the resulting XOR data in a buffer;
2322 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2323 * blocks transferred from the data-out buffer; and
2324 * 5) transfer the resulting XOR data to the data-in buffer.
2326 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2328 pr_err("Unable to allocate xor_callback buf\n");
2332 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2333 * into the locally allocated *buf
2335 sg_copy_to_buffer(cmd
->t_data_sg
,
2341 * Now perform the XOR against the BIDI read memory located at
2342 * cmd->t_mem_bidi_list
2346 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2347 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2351 for (i
= 0; i
< sg
->length
; i
++)
2352 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2354 offset
+= sg
->length
;
2355 kunmap_atomic(addr
, KM_USER0
);
2363 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2365 static int transport_get_sense_data(struct se_cmd
*cmd
)
2367 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2368 struct se_device
*dev
= cmd
->se_dev
;
2369 struct se_task
*task
= NULL
, *task_tmp
;
2370 unsigned long flags
;
2373 WARN_ON(!cmd
->se_lun
);
2378 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2379 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2380 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2384 list_for_each_entry_safe(task
, task_tmp
,
2385 &cmd
->t_task_list
, t_list
) {
2386 if (!(task
->task_flags
& TF_HAS_SENSE
))
2389 if (!dev
->transport
->get_sense_buffer
) {
2390 pr_err("dev->transport->get_sense_buffer"
2395 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2396 if (!sense_buffer
) {
2397 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2398 " sense buffer for task with sense\n",
2399 cmd
->se_tfo
->get_task_tag(cmd
), task
);
2402 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2404 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2405 TRANSPORT_SENSE_BUFFER
);
2407 memcpy(&buffer
[offset
], sense_buffer
,
2408 TRANSPORT_SENSE_BUFFER
);
2409 cmd
->scsi_status
= task
->task_scsi_status
;
2410 /* Automatically padded */
2411 cmd
->scsi_sense_length
=
2412 (TRANSPORT_SENSE_BUFFER
+ offset
);
2414 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2416 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2420 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2425 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2427 return dev
->transport
->get_blocks(dev
) + 1;
2430 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2432 struct se_device
*dev
= cmd
->se_dev
;
2435 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2438 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2440 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2441 pr_err("LBA: %llu Sectors: %u exceeds"
2442 " transport_dev_end_lba(): %llu\n",
2443 cmd
->t_task_lba
, sectors
,
2444 transport_dev_end_lba(dev
));
2451 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2454 * Determine if the received WRITE_SAME is used to for direct
2455 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2456 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2457 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2459 int passthrough
= (dev
->transport
->transport_type
==
2460 TRANSPORT_PLUGIN_PHBA_PDEV
);
2463 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2464 pr_err("WRITE_SAME PBDATA and LBDATA"
2465 " bits not supported for Block Discard"
2470 * Currently for the emulated case we only accept
2471 * tpws with the UNMAP=1 bit set.
2473 if (!(flags
[0] & 0x08)) {
2474 pr_err("WRITE_SAME w/o UNMAP bit not"
2475 " supported for Block Discard Emulation\n");
2483 /* transport_generic_cmd_sequencer():
2485 * Generic Command Sequencer that should work for most DAS transport
2488 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2491 * FIXME: Need to support other SCSI OPCODES where as well.
2493 static int transport_generic_cmd_sequencer(
2497 struct se_device
*dev
= cmd
->se_dev
;
2498 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2499 int ret
= 0, sector_ret
= 0, passthrough
;
2500 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2504 * Check for an existing UNIT ATTENTION condition
2506 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2507 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2508 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2512 * Check status of Asymmetric Logical Unit Assignment port
2514 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2517 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2518 * The ALUA additional sense code qualifier (ASCQ) is determined
2519 * by the ALUA primary or secondary access state..
2523 pr_debug("[%s]: ALUA TG Port not available,"
2524 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2525 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2527 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2528 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2529 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2532 goto out_invalid_cdb_field
;
2535 * Check status for SPC-3 Persistent Reservations
2537 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2538 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2539 cmd
, cdb
, pr_reg_type
) != 0) {
2540 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2541 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2542 cmd
->scsi_sense_reason
= TCM_RESERVATION_CONFLICT
;
2546 * This means the CDB is allowed for the SCSI Initiator port
2547 * when said port is *NOT* holding the legacy SPC-2 or
2548 * SPC-3 Persistent Reservation.
2553 * If we operate in passthrough mode we skip most CDB emulation and
2554 * instead hand the commands down to the physical SCSI device.
2557 (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
);
2561 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2563 goto out_unsupported_cdb
;
2564 size
= transport_get_size(sectors
, cdb
, cmd
);
2565 cmd
->t_task_lba
= transport_lba_21(cdb
);
2566 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2569 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2571 goto out_unsupported_cdb
;
2572 size
= transport_get_size(sectors
, cdb
, cmd
);
2573 cmd
->t_task_lba
= transport_lba_32(cdb
);
2574 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2577 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2579 goto out_unsupported_cdb
;
2580 size
= transport_get_size(sectors
, cdb
, cmd
);
2581 cmd
->t_task_lba
= transport_lba_32(cdb
);
2582 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2585 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2587 goto out_unsupported_cdb
;
2588 size
= transport_get_size(sectors
, cdb
, cmd
);
2589 cmd
->t_task_lba
= transport_lba_64(cdb
);
2590 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2593 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2595 goto out_unsupported_cdb
;
2596 size
= transport_get_size(sectors
, cdb
, cmd
);
2597 cmd
->t_task_lba
= transport_lba_21(cdb
);
2598 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2601 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2603 goto out_unsupported_cdb
;
2604 size
= transport_get_size(sectors
, cdb
, cmd
);
2605 cmd
->t_task_lba
= transport_lba_32(cdb
);
2607 cmd
->se_cmd_flags
|= SCF_FUA
;
2608 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2611 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2613 goto out_unsupported_cdb
;
2614 size
= transport_get_size(sectors
, cdb
, cmd
);
2615 cmd
->t_task_lba
= transport_lba_32(cdb
);
2617 cmd
->se_cmd_flags
|= SCF_FUA
;
2618 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2621 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2623 goto out_unsupported_cdb
;
2624 size
= transport_get_size(sectors
, cdb
, cmd
);
2625 cmd
->t_task_lba
= transport_lba_64(cdb
);
2627 cmd
->se_cmd_flags
|= SCF_FUA
;
2628 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2630 case XDWRITEREAD_10
:
2631 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2632 !(cmd
->se_cmd_flags
& SCF_BIDI
))
2633 goto out_invalid_cdb_field
;
2634 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2636 goto out_unsupported_cdb
;
2637 size
= transport_get_size(sectors
, cdb
, cmd
);
2638 cmd
->t_task_lba
= transport_lba_32(cdb
);
2639 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2642 * Do now allow BIDI commands for passthrough mode.
2645 goto out_unsupported_cdb
;
2648 * Setup BIDI XOR callback to be run after I/O completion.
2650 cmd
->transport_complete_callback
= &transport_xor_callback
;
2652 cmd
->se_cmd_flags
|= SCF_FUA
;
2654 case VARIABLE_LENGTH_CMD
:
2655 service_action
= get_unaligned_be16(&cdb
[8]);
2656 switch (service_action
) {
2657 case XDWRITEREAD_32
:
2658 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2660 goto out_unsupported_cdb
;
2661 size
= transport_get_size(sectors
, cdb
, cmd
);
2663 * Use WRITE_32 and READ_32 opcodes for the emulated
2664 * XDWRITE_READ_32 logic.
2666 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2667 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2670 * Do now allow BIDI commands for passthrough mode.
2673 goto out_unsupported_cdb
;
2676 * Setup BIDI XOR callback to be run during after I/O
2679 cmd
->transport_complete_callback
= &transport_xor_callback
;
2681 cmd
->se_cmd_flags
|= SCF_FUA
;
2684 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2686 goto out_unsupported_cdb
;
2689 size
= transport_get_size(1, cdb
, cmd
);
2691 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2693 goto out_invalid_cdb_field
;
2696 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2697 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2699 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2700 goto out_unsupported_cdb
;
2702 cmd
->execute_task
= target_emulate_write_same
;
2705 pr_err("VARIABLE_LENGTH_CMD service action"
2706 " 0x%04x not supported\n", service_action
);
2707 goto out_unsupported_cdb
;
2710 case MAINTENANCE_IN
:
2711 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2712 /* MAINTENANCE_IN from SCC-2 */
2714 * Check for emulated MI_REPORT_TARGET_PGS.
2716 if (cdb
[1] == MI_REPORT_TARGET_PGS
&&
2717 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2719 target_emulate_report_target_port_groups
;
2721 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2722 (cdb
[8] << 8) | cdb
[9];
2724 /* GPCMD_SEND_KEY from multi media commands */
2725 size
= (cdb
[8] << 8) + cdb
[9];
2727 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2731 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2733 case MODE_SELECT_10
:
2734 size
= (cdb
[7] << 8) + cdb
[8];
2735 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2739 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2741 cmd
->execute_task
= target_emulate_modesense
;
2744 size
= (cdb
[7] << 8) + cdb
[8];
2745 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2747 cmd
->execute_task
= target_emulate_modesense
;
2749 case GPCMD_READ_BUFFER_CAPACITY
:
2750 case GPCMD_SEND_OPC
:
2753 size
= (cdb
[7] << 8) + cdb
[8];
2754 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2756 case READ_BLOCK_LIMITS
:
2757 size
= READ_BLOCK_LEN
;
2758 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2760 case GPCMD_GET_CONFIGURATION
:
2761 case GPCMD_READ_FORMAT_CAPACITIES
:
2762 case GPCMD_READ_DISC_INFO
:
2763 case GPCMD_READ_TRACK_RZONE_INFO
:
2764 size
= (cdb
[7] << 8) + cdb
[8];
2765 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2767 case PERSISTENT_RESERVE_IN
:
2768 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2769 cmd
->execute_task
= target_scsi3_emulate_pr_in
;
2770 size
= (cdb
[7] << 8) + cdb
[8];
2771 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2773 case PERSISTENT_RESERVE_OUT
:
2774 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2775 cmd
->execute_task
= target_scsi3_emulate_pr_out
;
2776 size
= (cdb
[7] << 8) + cdb
[8];
2777 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2779 case GPCMD_MECHANISM_STATUS
:
2780 case GPCMD_READ_DVD_STRUCTURE
:
2781 size
= (cdb
[8] << 8) + cdb
[9];
2782 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2785 size
= READ_POSITION_LEN
;
2786 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2788 case MAINTENANCE_OUT
:
2789 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2790 /* MAINTENANCE_OUT from SCC-2
2792 * Check for emulated MO_SET_TARGET_PGS.
2794 if (cdb
[1] == MO_SET_TARGET_PGS
&&
2795 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2797 target_emulate_set_target_port_groups
;
2800 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2801 (cdb
[8] << 8) | cdb
[9];
2803 /* GPCMD_REPORT_KEY from multi media commands */
2804 size
= (cdb
[8] << 8) + cdb
[9];
2806 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2809 size
= (cdb
[3] << 8) + cdb
[4];
2811 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2812 * See spc4r17 section 5.3
2814 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2815 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
2816 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2818 cmd
->execute_task
= target_emulate_inquiry
;
2821 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2822 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2825 size
= READ_CAP_LEN
;
2826 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2828 cmd
->execute_task
= target_emulate_readcapacity
;
2830 case READ_MEDIA_SERIAL_NUMBER
:
2831 case SECURITY_PROTOCOL_IN
:
2832 case SECURITY_PROTOCOL_OUT
:
2833 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2834 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2836 case SERVICE_ACTION_IN
:
2837 switch (cmd
->t_task_cdb
[1] & 0x1f) {
2838 case SAI_READ_CAPACITY_16
:
2841 target_emulate_readcapacity_16
;
2847 pr_err("Unsupported SA: 0x%02x\n",
2848 cmd
->t_task_cdb
[1] & 0x1f);
2849 goto out_unsupported_cdb
;
2852 case ACCESS_CONTROL_IN
:
2853 case ACCESS_CONTROL_OUT
:
2855 case READ_ATTRIBUTE
:
2856 case RECEIVE_COPY_RESULTS
:
2857 case WRITE_ATTRIBUTE
:
2858 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
2859 (cdb
[12] << 8) | cdb
[13];
2860 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2862 case RECEIVE_DIAGNOSTIC
:
2863 case SEND_DIAGNOSTIC
:
2864 size
= (cdb
[3] << 8) | cdb
[4];
2865 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2867 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2870 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2871 size
= (2336 * sectors
);
2872 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2877 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2881 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2883 cmd
->execute_task
= target_emulate_request_sense
;
2885 case READ_ELEMENT_STATUS
:
2886 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
2887 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2890 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2891 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2896 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2897 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2899 if (cdb
[0] == RESERVE_10
)
2900 size
= (cdb
[7] << 8) | cdb
[8];
2902 size
= cmd
->data_length
;
2905 * Setup the legacy emulated handler for SPC-2 and
2906 * >= SPC-3 compatible reservation handling (CRH=1)
2907 * Otherwise, we assume the underlying SCSI logic is
2908 * is running in SPC_PASSTHROUGH, and wants reservations
2909 * emulation disabled.
2911 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2912 cmd
->execute_task
= target_scsi2_reservation_reserve
;
2913 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2918 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2919 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2921 if (cdb
[0] == RELEASE_10
)
2922 size
= (cdb
[7] << 8) | cdb
[8];
2924 size
= cmd
->data_length
;
2926 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2927 cmd
->execute_task
= target_scsi2_reservation_release
;
2928 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2930 case SYNCHRONIZE_CACHE
:
2931 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2933 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2935 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
2936 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2937 cmd
->t_task_lba
= transport_lba_32(cdb
);
2939 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2940 cmd
->t_task_lba
= transport_lba_64(cdb
);
2943 goto out_unsupported_cdb
;
2945 size
= transport_get_size(sectors
, cdb
, cmd
);
2946 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2952 * Check to ensure that LBA + Range does not exceed past end of
2953 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2955 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
2956 if (transport_cmd_get_valid_sectors(cmd
) < 0)
2957 goto out_invalid_cdb_field
;
2959 cmd
->execute_task
= target_emulate_synchronize_cache
;
2962 size
= get_unaligned_be16(&cdb
[7]);
2963 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2965 cmd
->execute_task
= target_emulate_unmap
;
2968 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2970 goto out_unsupported_cdb
;
2973 size
= transport_get_size(1, cdb
, cmd
);
2975 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2976 goto out_invalid_cdb_field
;
2979 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
2980 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2982 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2983 goto out_unsupported_cdb
;
2985 cmd
->execute_task
= target_emulate_write_same
;
2988 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2990 goto out_unsupported_cdb
;
2993 size
= transport_get_size(1, cdb
, cmd
);
2995 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2996 goto out_invalid_cdb_field
;
2999 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3000 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3002 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3003 * of byte 1 bit 3 UNMAP instead of original reserved field
3005 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3006 goto out_unsupported_cdb
;
3008 cmd
->execute_task
= target_emulate_write_same
;
3010 case ALLOW_MEDIUM_REMOVAL
:
3016 case TEST_UNIT_READY
:
3018 case WRITE_FILEMARKS
:
3019 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3021 cmd
->execute_task
= target_emulate_noop
;
3023 case GPCMD_CLOSE_TRACK
:
3024 case INITIALIZE_ELEMENT_STATUS
:
3025 case GPCMD_LOAD_UNLOAD
:
3026 case GPCMD_SET_SPEED
:
3028 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3031 cmd
->execute_task
= target_report_luns
;
3032 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3034 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3035 * See spc4r17 section 5.3
3037 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3038 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3039 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3042 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3043 " 0x%02x, sending CHECK_CONDITION.\n",
3044 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3045 goto out_unsupported_cdb
;
3048 if (size
!= cmd
->data_length
) {
3049 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3050 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3051 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3052 cmd
->data_length
, size
, cdb
[0]);
3054 cmd
->cmd_spdtl
= size
;
3056 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3057 pr_err("Rejecting underflow/overflow"
3059 goto out_invalid_cdb_field
;
3062 * Reject READ_* or WRITE_* with overflow/underflow for
3063 * type SCF_SCSI_DATA_SG_IO_CDB.
3065 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3066 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3067 " CDB on non 512-byte sector setup subsystem"
3068 " plugin: %s\n", dev
->transport
->name
);
3069 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3070 goto out_invalid_cdb_field
;
3073 if (size
> cmd
->data_length
) {
3074 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3075 cmd
->residual_count
= (size
- cmd
->data_length
);
3077 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3078 cmd
->residual_count
= (cmd
->data_length
- size
);
3080 cmd
->data_length
= size
;
3083 /* reject any command that we don't have a handler for */
3084 if (!(passthrough
|| cmd
->execute_task
||
3085 (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
3086 goto out_unsupported_cdb
;
3088 transport_set_supported_SAM_opcode(cmd
);
3091 out_unsupported_cdb
:
3092 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3093 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3095 out_invalid_cdb_field
:
3096 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3097 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3102 * Called from I/O completion to determine which dormant/delayed
3103 * and ordered cmds need to have their tasks added to the execution queue.
3105 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3107 struct se_device
*dev
= cmd
->se_dev
;
3108 struct se_cmd
*cmd_p
, *cmd_tmp
;
3109 int new_active_tasks
= 0;
3111 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3112 atomic_dec(&dev
->simple_cmds
);
3113 smp_mb__after_atomic_dec();
3114 dev
->dev_cur_ordered_id
++;
3115 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3116 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3117 cmd
->se_ordered_id
);
3118 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3119 dev
->dev_cur_ordered_id
++;
3120 pr_debug("Incremented dev_cur_ordered_id: %u for"
3121 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3122 cmd
->se_ordered_id
);
3123 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3124 atomic_dec(&dev
->dev_ordered_sync
);
3125 smp_mb__after_atomic_dec();
3127 dev
->dev_cur_ordered_id
++;
3128 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3129 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3132 * Process all commands up to the last received
3133 * ORDERED task attribute which requires another blocking
3136 spin_lock(&dev
->delayed_cmd_lock
);
3137 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3138 &dev
->delayed_cmd_list
, se_delayed_node
) {
3140 list_del(&cmd_p
->se_delayed_node
);
3141 spin_unlock(&dev
->delayed_cmd_lock
);
3143 pr_debug("Calling add_tasks() for"
3144 " cmd_p: 0x%02x Task Attr: 0x%02x"
3145 " Dormant -> Active, se_ordered_id: %u\n",
3146 cmd_p
->t_task_cdb
[0],
3147 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3149 transport_add_tasks_from_cmd(cmd_p
);
3152 spin_lock(&dev
->delayed_cmd_lock
);
3153 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3156 spin_unlock(&dev
->delayed_cmd_lock
);
3158 * If new tasks have become active, wake up the transport thread
3159 * to do the processing of the Active tasks.
3161 if (new_active_tasks
!= 0)
3162 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3165 static void transport_complete_qf(struct se_cmd
*cmd
)
3169 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3170 transport_complete_task_attr(cmd
);
3172 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3173 ret
= cmd
->se_tfo
->queue_status(cmd
);
3178 switch (cmd
->data_direction
) {
3179 case DMA_FROM_DEVICE
:
3180 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3183 if (cmd
->t_bidi_data_sg
) {
3184 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3188 /* Fall through for DMA_TO_DEVICE */
3190 ret
= cmd
->se_tfo
->queue_status(cmd
);
3198 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3201 transport_lun_remove_cmd(cmd
);
3202 transport_cmd_check_stop_to_fabric(cmd
);
3205 static void transport_handle_queue_full(
3207 struct se_device
*dev
)
3209 spin_lock_irq(&dev
->qf_cmd_lock
);
3210 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3211 atomic_inc(&dev
->dev_qf_count
);
3212 smp_mb__after_atomic_inc();
3213 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3215 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3218 static void target_complete_ok_work(struct work_struct
*work
)
3220 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3221 int reason
= 0, ret
;
3224 * Check if we need to move delayed/dormant tasks from cmds on the
3225 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3228 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3229 transport_complete_task_attr(cmd
);
3231 * Check to schedule QUEUE_FULL work, or execute an existing
3232 * cmd->transport_qf_callback()
3234 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3235 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3238 * Check if we need to retrieve a sense buffer from
3239 * the struct se_cmd in question.
3241 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3242 if (transport_get_sense_data(cmd
) < 0)
3243 reason
= TCM_NON_EXISTENT_LUN
;
3246 * Only set when an struct se_task->task_scsi_status returned
3247 * a non GOOD status.
3249 if (cmd
->scsi_status
) {
3250 ret
= transport_send_check_condition_and_sense(
3252 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3255 transport_lun_remove_cmd(cmd
);
3256 transport_cmd_check_stop_to_fabric(cmd
);
3261 * Check for a callback, used by amongst other things
3262 * XDWRITE_READ_10 emulation.
3264 if (cmd
->transport_complete_callback
)
3265 cmd
->transport_complete_callback(cmd
);
3267 switch (cmd
->data_direction
) {
3268 case DMA_FROM_DEVICE
:
3269 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3270 if (cmd
->se_lun
->lun_sep
) {
3271 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3274 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3276 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3277 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3281 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3282 if (cmd
->se_lun
->lun_sep
) {
3283 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3286 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3288 * Check if we need to send READ payload for BIDI-COMMAND
3290 if (cmd
->t_bidi_data_sg
) {
3291 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3292 if (cmd
->se_lun
->lun_sep
) {
3293 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3296 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3297 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3298 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3302 /* Fall through for DMA_TO_DEVICE */
3304 ret
= cmd
->se_tfo
->queue_status(cmd
);
3305 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3312 transport_lun_remove_cmd(cmd
);
3313 transport_cmd_check_stop_to_fabric(cmd
);
3317 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3318 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3319 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3320 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3323 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3325 struct se_task
*task
, *task_tmp
;
3326 unsigned long flags
;
3327 LIST_HEAD(dispose_list
);
3329 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3330 list_for_each_entry_safe(task
, task_tmp
,
3331 &cmd
->t_task_list
, t_list
) {
3332 if (!(task
->task_flags
& TF_ACTIVE
))
3333 list_move_tail(&task
->t_list
, &dispose_list
);
3335 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3337 while (!list_empty(&dispose_list
)) {
3338 task
= list_first_entry(&dispose_list
, struct se_task
, t_list
);
3340 if (task
->task_sg
!= cmd
->t_data_sg
&&
3341 task
->task_sg
!= cmd
->t_bidi_data_sg
)
3342 kfree(task
->task_sg
);
3344 list_del(&task
->t_list
);
3346 cmd
->se_dev
->transport
->free_task(task
);
3350 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3352 struct scatterlist
*sg
;
3355 for_each_sg(sgl
, sg
, nents
, count
)
3356 __free_page(sg_page(sg
));
3361 static inline void transport_free_pages(struct se_cmd
*cmd
)
3363 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3366 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3367 cmd
->t_data_sg
= NULL
;
3368 cmd
->t_data_nents
= 0;
3370 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3371 cmd
->t_bidi_data_sg
= NULL
;
3372 cmd
->t_bidi_data_nents
= 0;
3376 * transport_release_cmd - free a command
3377 * @cmd: command to free
3379 * This routine unconditionally frees a command, and reference counting
3380 * or list removal must be done in the caller.
3382 static void transport_release_cmd(struct se_cmd
*cmd
)
3384 BUG_ON(!cmd
->se_tfo
);
3386 if (cmd
->se_tmr_req
)
3387 core_tmr_release_req(cmd
->se_tmr_req
);
3388 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
3389 kfree(cmd
->t_task_cdb
);
3391 * If this cmd has been setup with target_get_sess_cmd(), drop
3392 * the kref and call ->release_cmd() in kref callback.
3394 if (cmd
->check_release
!= 0) {
3395 target_put_sess_cmd(cmd
->se_sess
, cmd
);
3398 cmd
->se_tfo
->release_cmd(cmd
);
3402 * transport_put_cmd - release a reference to a command
3403 * @cmd: command to release
3405 * This routine releases our reference to the command and frees it if possible.
3407 static void transport_put_cmd(struct se_cmd
*cmd
)
3409 unsigned long flags
;
3412 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3413 if (atomic_read(&cmd
->t_fe_count
)) {
3414 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3418 if (atomic_read(&cmd
->t_se_count
)) {
3419 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3423 if (atomic_read(&cmd
->transport_dev_active
)) {
3424 atomic_set(&cmd
->transport_dev_active
, 0);
3425 transport_all_task_dev_remove_state(cmd
);
3428 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3430 if (free_tasks
!= 0)
3431 transport_free_dev_tasks(cmd
);
3433 transport_free_pages(cmd
);
3434 transport_release_cmd(cmd
);
3437 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3441 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3442 * allocating in the core.
3443 * @cmd: Associated se_cmd descriptor
3444 * @mem: SGL style memory for TCM WRITE / READ
3445 * @sg_mem_num: Number of SGL elements
3446 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3447 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3449 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3452 int transport_generic_map_mem_to_cmd(
3454 struct scatterlist
*sgl
,
3456 struct scatterlist
*sgl_bidi
,
3459 if (!sgl
|| !sgl_count
)
3462 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3463 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3465 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3466 * scatterlists already have been set to follow what the fabric
3467 * passes for the original expected data transfer length.
3469 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3470 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3471 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3472 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3473 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3477 cmd
->t_data_sg
= sgl
;
3478 cmd
->t_data_nents
= sgl_count
;
3480 if (sgl_bidi
&& sgl_bidi_count
) {
3481 cmd
->t_bidi_data_sg
= sgl_bidi
;
3482 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3484 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3489 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3491 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
3493 struct scatterlist
*sg
= cmd
->t_data_sg
;
3494 struct page
**pages
;
3499 * We need to take into account a possible offset here for fabrics like
3500 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3501 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3503 if (!cmd
->t_data_nents
)
3505 else if (cmd
->t_data_nents
== 1)
3506 return kmap(sg_page(sg
)) + sg
->offset
;
3508 /* >1 page. use vmap */
3509 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
3513 /* convert sg[] to pages[] */
3514 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
3515 pages
[i
] = sg_page(sg
);
3518 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
3520 if (!cmd
->t_data_vmap
)
3523 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
3525 EXPORT_SYMBOL(transport_kmap_data_sg
);
3527 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
3529 if (!cmd
->t_data_nents
)
3531 else if (cmd
->t_data_nents
== 1)
3532 kunmap(sg_page(cmd
->t_data_sg
));
3534 vunmap(cmd
->t_data_vmap
);
3535 cmd
->t_data_vmap
= NULL
;
3537 EXPORT_SYMBOL(transport_kunmap_data_sg
);
3540 transport_generic_get_mem(struct se_cmd
*cmd
)
3542 u32 length
= cmd
->data_length
;
3548 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3549 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3550 if (!cmd
->t_data_sg
)
3553 cmd
->t_data_nents
= nents
;
3554 sg_init_table(cmd
->t_data_sg
, nents
);
3556 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
? 0 : __GFP_ZERO
;
3559 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3560 page
= alloc_page(GFP_KERNEL
| zero_flag
);
3564 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3572 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3575 kfree(cmd
->t_data_sg
);
3576 cmd
->t_data_sg
= NULL
;
3580 /* Reduce sectors if they are too long for the device */
3581 static inline sector_t
transport_limit_task_sectors(
3582 struct se_device
*dev
,
3583 unsigned long long lba
,
3586 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3588 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3589 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3590 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3597 * This function can be used by HW target mode drivers to create a linked
3598 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3599 * This is intended to be called during the completion path by TCM Core
3600 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3602 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3604 struct scatterlist
*sg_first
= NULL
;
3605 struct scatterlist
*sg_prev
= NULL
;
3606 int sg_prev_nents
= 0;
3607 struct scatterlist
*sg
;
3608 struct se_task
*task
;
3609 u32 chained_nents
= 0;
3612 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3615 * Walk the struct se_task list and setup scatterlist chains
3616 * for each contiguously allocated struct se_task->task_sg[].
3618 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3623 sg_first
= task
->task_sg
;
3624 chained_nents
= task
->task_sg_nents
;
3626 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3627 chained_nents
+= task
->task_sg_nents
;
3630 * For the padded tasks, use the extra SGL vector allocated
3631 * in transport_allocate_data_tasks() for the sg_prev_nents
3632 * offset into sg_chain() above.
3634 * We do not need the padding for the last task (or a single
3635 * task), but in that case we will never use the sg_prev_nents
3636 * value below which would be incorrect.
3638 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3639 sg_prev
= task
->task_sg
;
3642 * Setup the starting pointer and total t_tasks_sg_linked_no including
3643 * padding SGs for linking and to mark the end.
3645 cmd
->t_tasks_sg_chained
= sg_first
;
3646 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3648 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3649 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3650 cmd
->t_tasks_sg_chained_no
);
3652 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
3653 cmd
->t_tasks_sg_chained_no
, i
) {
3655 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3656 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
3657 if (sg_is_chain(sg
))
3658 pr_debug("SG: %p sg_is_chain=1\n", sg
);
3660 pr_debug("SG: %p sg_is_last=1\n", sg
);
3663 EXPORT_SYMBOL(transport_do_task_sg_chain
);
3666 * Break up cmd into chunks transport can handle
3669 transport_allocate_data_tasks(struct se_cmd
*cmd
,
3670 enum dma_data_direction data_direction
,
3671 struct scatterlist
*cmd_sg
, unsigned int sgl_nents
)
3673 struct se_device
*dev
= cmd
->se_dev
;
3675 unsigned long long lba
;
3676 sector_t sectors
, dev_max_sectors
;
3679 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3682 dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
3683 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
3685 WARN_ON(cmd
->data_length
% sector_size
);
3687 lba
= cmd
->t_task_lba
;
3688 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
3689 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
3692 * If we need just a single task reuse the SG list in the command
3693 * and avoid a lot of work.
3695 if (task_count
== 1) {
3696 struct se_task
*task
;
3697 unsigned long flags
;
3699 task
= transport_generic_get_task(cmd
, data_direction
);
3703 task
->task_sg
= cmd_sg
;
3704 task
->task_sg_nents
= sgl_nents
;
3706 task
->task_lba
= lba
;
3707 task
->task_sectors
= sectors
;
3708 task
->task_size
= task
->task_sectors
* sector_size
;
3710 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3711 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3712 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3717 for (i
= 0; i
< task_count
; i
++) {
3718 struct se_task
*task
;
3719 unsigned int task_size
, task_sg_nents_padded
;
3720 struct scatterlist
*sg
;
3721 unsigned long flags
;
3724 task
= transport_generic_get_task(cmd
, data_direction
);
3728 task
->task_lba
= lba
;
3729 task
->task_sectors
= min(sectors
, dev_max_sectors
);
3730 task
->task_size
= task
->task_sectors
* sector_size
;
3733 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3734 * in order to calculate the number per task SGL entries
3736 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
3738 * Check if the fabric module driver is requesting that all
3739 * struct se_task->task_sg[] be chained together.. If so,
3740 * then allocate an extra padding SG entry for linking and
3741 * marking the end of the chained SGL for every task except
3742 * the last one for (task_count > 1) operation, or skipping
3743 * the extra padding for the (task_count == 1) case.
3745 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
3746 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
3748 task_sg_nents_padded
= task
->task_sg_nents
;
3750 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
3751 task_sg_nents_padded
, GFP_KERNEL
);
3752 if (!task
->task_sg
) {
3753 cmd
->se_dev
->transport
->free_task(task
);
3757 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
3759 task_size
= task
->task_size
;
3761 /* Build new sgl, only up to task_size */
3762 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
3763 if (cmd_sg
->length
> task_size
)
3767 task_size
-= cmd_sg
->length
;
3768 cmd_sg
= sg_next(cmd_sg
);
3771 lba
+= task
->task_sectors
;
3772 sectors
-= task
->task_sectors
;
3774 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3775 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3776 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3783 transport_allocate_control_task(struct se_cmd
*cmd
)
3785 struct se_task
*task
;
3786 unsigned long flags
;
3788 /* Workaround for handling zero-length control CDBs */
3789 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3793 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
3797 task
->task_sg
= cmd
->t_data_sg
;
3798 task
->task_size
= cmd
->data_length
;
3799 task
->task_sg_nents
= cmd
->t_data_nents
;
3801 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3802 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3803 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3805 /* Success! Return number of tasks allocated */
3810 * Allocate any required ressources to execute the command, and either place
3811 * it on the execution queue if possible. For writes we might not have the
3812 * payload yet, thus notify the fabric via a call to ->write_pending instead.
3814 int transport_generic_new_cmd(struct se_cmd
*cmd
)
3816 struct se_device
*dev
= cmd
->se_dev
;
3817 int task_cdbs
, task_cdbs_bidi
= 0;
3822 * Determine is the TCM fabric module has already allocated physical
3823 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3826 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
3828 ret
= transport_generic_get_mem(cmd
);
3834 * For BIDI command set up the read tasks first.
3836 if (cmd
->t_bidi_data_sg
&&
3837 dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
3838 BUG_ON(!(cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
));
3840 task_cdbs_bidi
= transport_allocate_data_tasks(cmd
,
3841 DMA_FROM_DEVICE
, cmd
->t_bidi_data_sg
,
3842 cmd
->t_bidi_data_nents
);
3843 if (task_cdbs_bidi
<= 0)
3846 atomic_inc(&cmd
->t_fe_count
);
3847 atomic_inc(&cmd
->t_se_count
);
3851 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
3852 task_cdbs
= transport_allocate_data_tasks(cmd
,
3853 cmd
->data_direction
, cmd
->t_data_sg
,
3856 task_cdbs
= transport_allocate_control_task(cmd
);
3861 else if (!task_cdbs
&& (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)) {
3862 cmd
->t_state
= TRANSPORT_COMPLETE
;
3863 atomic_set(&cmd
->t_transport_active
, 1);
3865 if (cmd
->t_task_cdb
[0] == REQUEST_SENSE
) {
3866 u8 ua_asc
= 0, ua_ascq
= 0;
3868 core_scsi3_ua_clear_for_request_sense(cmd
,
3872 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
3873 queue_work(target_completion_wq
, &cmd
->work
);
3878 atomic_inc(&cmd
->t_fe_count
);
3879 atomic_inc(&cmd
->t_se_count
);
3882 cmd
->t_task_list_num
= (task_cdbs
+ task_cdbs_bidi
);
3883 atomic_set(&cmd
->t_task_cdbs_left
, cmd
->t_task_list_num
);
3884 atomic_set(&cmd
->t_task_cdbs_ex_left
, cmd
->t_task_list_num
);
3887 * For WRITEs, let the fabric know its buffer is ready..
3888 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3889 * will be added to the struct se_device execution queue after its WRITE
3890 * data has arrived. (ie: It gets handled by the transport processing
3891 * thread a second time)
3893 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3894 transport_add_tasks_to_state_queue(cmd
);
3895 return transport_generic_write_pending(cmd
);
3898 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3899 * to the execution queue.
3901 transport_execute_tasks(cmd
);
3905 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3906 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3909 EXPORT_SYMBOL(transport_generic_new_cmd
);
3911 /* transport_generic_process_write():
3915 void transport_generic_process_write(struct se_cmd
*cmd
)
3917 transport_execute_tasks(cmd
);
3919 EXPORT_SYMBOL(transport_generic_process_write
);
3921 static void transport_write_pending_qf(struct se_cmd
*cmd
)
3925 ret
= cmd
->se_tfo
->write_pending(cmd
);
3926 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
3927 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3929 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3933 static int transport_generic_write_pending(struct se_cmd
*cmd
)
3935 unsigned long flags
;
3938 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3939 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
3940 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3943 * Clear the se_cmd for WRITE_PENDING status in order to set
3944 * cmd->t_transport_active=0 so that transport_generic_handle_data
3945 * can be called from HW target mode interrupt code. This is safe
3946 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
3947 * because the se_cmd->se_lun pointer is not being cleared.
3949 transport_cmd_check_stop(cmd
, 1, 0);
3952 * Call the fabric write_pending function here to let the
3953 * frontend know that WRITE buffers are ready.
3955 ret
= cmd
->se_tfo
->write_pending(cmd
);
3956 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3964 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
3965 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
3966 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3970 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
3972 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
3973 if (wait_for_tasks
&& cmd
->se_tmr_req
)
3974 transport_wait_for_tasks(cmd
);
3976 transport_release_cmd(cmd
);
3979 transport_wait_for_tasks(cmd
);
3981 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
3984 transport_lun_remove_cmd(cmd
);
3986 transport_free_dev_tasks(cmd
);
3988 transport_put_cmd(cmd
);
3991 EXPORT_SYMBOL(transport_generic_free_cmd
);
3993 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3994 * @se_sess: session to reference
3995 * @se_cmd: command descriptor to add
3996 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
3998 void target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
4001 unsigned long flags
;
4003 kref_init(&se_cmd
->cmd_kref
);
4005 * Add a second kref if the fabric caller is expecting to handle
4006 * fabric acknowledgement that requires two target_put_sess_cmd()
4007 * invocations before se_cmd descriptor release.
4009 if (ack_kref
== true)
4010 kref_get(&se_cmd
->cmd_kref
);
4012 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
4013 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
4014 se_cmd
->check_release
= 1;
4015 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4017 EXPORT_SYMBOL(target_get_sess_cmd
);
4019 static void target_release_cmd_kref(struct kref
*kref
)
4021 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
4022 struct se_session
*se_sess
= se_cmd
->se_sess
;
4023 unsigned long flags
;
4025 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
4026 if (list_empty(&se_cmd
->se_cmd_list
)) {
4027 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4031 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
4032 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4033 complete(&se_cmd
->cmd_wait_comp
);
4036 list_del(&se_cmd
->se_cmd_list
);
4037 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4039 se_cmd
->se_tfo
->release_cmd(se_cmd
);
4042 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4043 * @se_sess: session to reference
4044 * @se_cmd: command descriptor to drop
4046 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
4048 return kref_put(&se_cmd
->cmd_kref
, target_release_cmd_kref
);
4050 EXPORT_SYMBOL(target_put_sess_cmd
);
4052 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4053 * @se_sess: session to split
4055 void target_splice_sess_cmd_list(struct se_session
*se_sess
)
4057 struct se_cmd
*se_cmd
;
4058 unsigned long flags
;
4060 WARN_ON(!list_empty(&se_sess
->sess_wait_list
));
4061 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
4063 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
4064 se_sess
->sess_tearing_down
= 1;
4066 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
4068 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
4069 se_cmd
->cmd_wait_set
= 1;
4071 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
4073 EXPORT_SYMBOL(target_splice_sess_cmd_list
);
4075 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4076 * @se_sess: session to wait for active I/O
4077 * @wait_for_tasks: Make extra transport_wait_for_tasks call
4079 void target_wait_for_sess_cmds(
4080 struct se_session
*se_sess
,
4083 struct se_cmd
*se_cmd
, *tmp_cmd
;
4086 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
4087 &se_sess
->sess_wait_list
, se_cmd_list
) {
4088 list_del(&se_cmd
->se_cmd_list
);
4090 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4091 " %d\n", se_cmd
, se_cmd
->t_state
,
4092 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4094 if (wait_for_tasks
) {
4095 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4096 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4097 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4099 rc
= transport_wait_for_tasks(se_cmd
);
4101 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4102 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4103 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4107 wait_for_completion(&se_cmd
->cmd_wait_comp
);
4108 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4109 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4110 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4113 se_cmd
->se_tfo
->release_cmd(se_cmd
);
4116 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
4118 /* transport_lun_wait_for_tasks():
4120 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4121 * an struct se_lun to be successfully shutdown.
4123 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4125 unsigned long flags
;
4128 * If the frontend has already requested this struct se_cmd to
4129 * be stopped, we can safely ignore this struct se_cmd.
4131 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4132 if (atomic_read(&cmd
->t_transport_stop
)) {
4133 atomic_set(&cmd
->transport_lun_stop
, 0);
4134 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4135 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4136 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4137 transport_cmd_check_stop(cmd
, 1, 0);
4140 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4141 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4143 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4145 ret
= transport_stop_tasks_for_cmd(cmd
);
4147 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4148 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4150 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4151 cmd
->se_tfo
->get_task_tag(cmd
));
4152 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4153 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4154 cmd
->se_tfo
->get_task_tag(cmd
));
4156 transport_remove_cmd_from_queue(cmd
);
4161 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4163 struct se_cmd
*cmd
= NULL
;
4164 unsigned long lun_flags
, cmd_flags
;
4166 * Do exception processing and return CHECK_CONDITION status to the
4169 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4170 while (!list_empty(&lun
->lun_cmd_list
)) {
4171 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4172 struct se_cmd
, se_lun_node
);
4173 list_del(&cmd
->se_lun_node
);
4175 atomic_set(&cmd
->transport_lun_active
, 0);
4177 * This will notify iscsi_target_transport.c:
4178 * transport_cmd_check_stop() that a LUN shutdown is in
4179 * progress for the iscsi_cmd_t.
4181 spin_lock(&cmd
->t_state_lock
);
4182 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4183 "_lun_stop for ITT: 0x%08x\n",
4184 cmd
->se_lun
->unpacked_lun
,
4185 cmd
->se_tfo
->get_task_tag(cmd
));
4186 atomic_set(&cmd
->transport_lun_stop
, 1);
4187 spin_unlock(&cmd
->t_state_lock
);
4189 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4192 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4193 cmd
->se_tfo
->get_task_tag(cmd
),
4194 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4198 * If the Storage engine still owns the iscsi_cmd_t, determine
4199 * and/or stop its context.
4201 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4202 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4203 cmd
->se_tfo
->get_task_tag(cmd
));
4205 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4206 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4210 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4211 "_wait_for_tasks(): SUCCESS\n",
4212 cmd
->se_lun
->unpacked_lun
,
4213 cmd
->se_tfo
->get_task_tag(cmd
));
4215 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4216 if (!atomic_read(&cmd
->transport_dev_active
)) {
4217 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4220 atomic_set(&cmd
->transport_dev_active
, 0);
4221 transport_all_task_dev_remove_state(cmd
);
4222 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4224 transport_free_dev_tasks(cmd
);
4226 * The Storage engine stopped this struct se_cmd before it was
4227 * send to the fabric frontend for delivery back to the
4228 * Initiator Node. Return this SCSI CDB back with an
4229 * CHECK_CONDITION status.
4232 transport_send_check_condition_and_sense(cmd
,
4233 TCM_NON_EXISTENT_LUN
, 0);
4235 * If the fabric frontend is waiting for this iscsi_cmd_t to
4236 * be released, notify the waiting thread now that LU has
4237 * finished accessing it.
4239 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4240 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4241 pr_debug("SE_LUN[%d] - Detected FE stop for"
4242 " struct se_cmd: %p ITT: 0x%08x\n",
4244 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4246 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4248 transport_cmd_check_stop(cmd
, 1, 0);
4249 complete(&cmd
->transport_lun_fe_stop_comp
);
4250 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4253 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4254 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4256 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4257 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4259 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4262 static int transport_clear_lun_thread(void *p
)
4264 struct se_lun
*lun
= p
;
4266 __transport_clear_lun_from_sessions(lun
);
4267 complete(&lun
->lun_shutdown_comp
);
4272 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4274 struct task_struct
*kt
;
4276 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4277 "tcm_cl_%u", lun
->unpacked_lun
);
4279 pr_err("Unable to start clear_lun thread\n");
4282 wait_for_completion(&lun
->lun_shutdown_comp
);
4288 * transport_wait_for_tasks - wait for completion to occur
4289 * @cmd: command to wait
4291 * Called from frontend fabric context to wait for storage engine
4292 * to pause and/or release frontend generated struct se_cmd.
4294 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
4296 unsigned long flags
;
4298 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4299 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
)) {
4300 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4304 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4305 * has been set in transport_set_supported_SAM_opcode().
4307 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) && !cmd
->se_tmr_req
) {
4308 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4312 * If we are already stopped due to an external event (ie: LUN shutdown)
4313 * sleep until the connection can have the passed struct se_cmd back.
4314 * The cmd->transport_lun_stopped_sem will be upped by
4315 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4316 * has completed its operation on the struct se_cmd.
4318 if (atomic_read(&cmd
->transport_lun_stop
)) {
4320 pr_debug("wait_for_tasks: Stopping"
4321 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4322 "_stop_comp); for ITT: 0x%08x\n",
4323 cmd
->se_tfo
->get_task_tag(cmd
));
4325 * There is a special case for WRITES where a FE exception +
4326 * LUN shutdown means ConfigFS context is still sleeping on
4327 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4328 * We go ahead and up transport_lun_stop_comp just to be sure
4331 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4332 complete(&cmd
->transport_lun_stop_comp
);
4333 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4334 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4336 transport_all_task_dev_remove_state(cmd
);
4338 * At this point, the frontend who was the originator of this
4339 * struct se_cmd, now owns the structure and can be released through
4340 * normal means below.
4342 pr_debug("wait_for_tasks: Stopped"
4343 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4344 "stop_comp); for ITT: 0x%08x\n",
4345 cmd
->se_tfo
->get_task_tag(cmd
));
4347 atomic_set(&cmd
->transport_lun_stop
, 0);
4349 if (!atomic_read(&cmd
->t_transport_active
) ||
4350 atomic_read(&cmd
->t_transport_aborted
)) {
4351 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4355 atomic_set(&cmd
->t_transport_stop
, 1);
4357 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4358 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4359 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4360 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4362 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4364 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4366 wait_for_completion(&cmd
->t_transport_stop_comp
);
4368 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4369 atomic_set(&cmd
->t_transport_active
, 0);
4370 atomic_set(&cmd
->t_transport_stop
, 0);
4372 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4373 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4374 cmd
->se_tfo
->get_task_tag(cmd
));
4376 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4380 EXPORT_SYMBOL(transport_wait_for_tasks
);
4382 static int transport_get_sense_codes(
4387 *asc
= cmd
->scsi_asc
;
4388 *ascq
= cmd
->scsi_ascq
;
4393 static int transport_set_sense_codes(
4398 cmd
->scsi_asc
= asc
;
4399 cmd
->scsi_ascq
= ascq
;
4404 int transport_send_check_condition_and_sense(
4409 unsigned char *buffer
= cmd
->sense_buffer
;
4410 unsigned long flags
;
4412 u8 asc
= 0, ascq
= 0;
4414 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4415 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4416 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4419 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4420 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4422 if (!reason
&& from_transport
)
4425 if (!from_transport
)
4426 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4428 * Data Segment and SenseLength of the fabric response PDU.
4430 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4431 * from include/scsi/scsi_cmnd.h
4433 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4434 TRANSPORT_SENSE_BUFFER
);
4436 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4437 * SENSE KEY values from include/scsi/scsi.h
4440 case TCM_NON_EXISTENT_LUN
:
4442 buffer
[offset
] = 0x70;
4443 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4444 /* ILLEGAL REQUEST */
4445 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4446 /* LOGICAL UNIT NOT SUPPORTED */
4447 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4449 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4450 case TCM_SECTOR_COUNT_TOO_MANY
:
4452 buffer
[offset
] = 0x70;
4453 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4454 /* ILLEGAL REQUEST */
4455 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4456 /* INVALID COMMAND OPERATION CODE */
4457 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4459 case TCM_UNKNOWN_MODE_PAGE
:
4461 buffer
[offset
] = 0x70;
4462 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4463 /* ILLEGAL REQUEST */
4464 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4465 /* INVALID FIELD IN CDB */
4466 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4468 case TCM_CHECK_CONDITION_ABORT_CMD
:
4470 buffer
[offset
] = 0x70;
4471 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4472 /* ABORTED COMMAND */
4473 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4474 /* BUS DEVICE RESET FUNCTION OCCURRED */
4475 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4476 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4478 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4480 buffer
[offset
] = 0x70;
4481 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4482 /* ABORTED COMMAND */
4483 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4485 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4486 /* NOT ENOUGH UNSOLICITED DATA */
4487 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4489 case TCM_INVALID_CDB_FIELD
:
4491 buffer
[offset
] = 0x70;
4492 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4493 /* ILLEGAL REQUEST */
4494 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4495 /* INVALID FIELD IN CDB */
4496 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4498 case TCM_INVALID_PARAMETER_LIST
:
4500 buffer
[offset
] = 0x70;
4501 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4502 /* ILLEGAL REQUEST */
4503 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4504 /* INVALID FIELD IN PARAMETER LIST */
4505 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4507 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4509 buffer
[offset
] = 0x70;
4510 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4511 /* ABORTED COMMAND */
4512 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4514 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4515 /* UNEXPECTED_UNSOLICITED_DATA */
4516 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4518 case TCM_SERVICE_CRC_ERROR
:
4520 buffer
[offset
] = 0x70;
4521 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4522 /* ABORTED COMMAND */
4523 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4524 /* PROTOCOL SERVICE CRC ERROR */
4525 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4527 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4529 case TCM_SNACK_REJECTED
:
4531 buffer
[offset
] = 0x70;
4532 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4533 /* ABORTED COMMAND */
4534 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4536 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4537 /* FAILED RETRANSMISSION REQUEST */
4538 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4540 case TCM_WRITE_PROTECTED
:
4542 buffer
[offset
] = 0x70;
4543 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4545 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4546 /* WRITE PROTECTED */
4547 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4549 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4551 buffer
[offset
] = 0x70;
4552 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4553 /* UNIT ATTENTION */
4554 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4555 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4556 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4557 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4559 case TCM_CHECK_CONDITION_NOT_READY
:
4561 buffer
[offset
] = 0x70;
4562 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4564 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4565 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4566 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4567 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4569 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4572 buffer
[offset
] = 0x70;
4573 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4574 /* ILLEGAL REQUEST */
4575 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4576 /* LOGICAL UNIT COMMUNICATION FAILURE */
4577 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4581 * This code uses linux/include/scsi/scsi.h SAM status codes!
4583 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4585 * Automatically padded, this value is encoded in the fabric's
4586 * data_length response PDU containing the SCSI defined sense data.
4588 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4591 return cmd
->se_tfo
->queue_status(cmd
);
4593 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4595 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4599 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4601 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4604 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4605 " status for CDB: 0x%02x ITT: 0x%08x\n",
4607 cmd
->se_tfo
->get_task_tag(cmd
));
4609 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4610 cmd
->se_tfo
->queue_status(cmd
);
4615 EXPORT_SYMBOL(transport_check_aborted_status
);
4617 void transport_send_task_abort(struct se_cmd
*cmd
)
4619 unsigned long flags
;
4621 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4622 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4623 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4626 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4629 * If there are still expected incoming fabric WRITEs, we wait
4630 * until until they have completed before sending a TASK_ABORTED
4631 * response. This response with TASK_ABORTED status will be
4632 * queued back to fabric module by transport_check_aborted_status().
4634 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4635 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4636 atomic_inc(&cmd
->t_transport_aborted
);
4637 smp_mb__after_atomic_inc();
4640 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4642 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4643 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4644 cmd
->se_tfo
->get_task_tag(cmd
));
4646 cmd
->se_tfo
->queue_status(cmd
);
4649 static int transport_generic_do_tmr(struct se_cmd
*cmd
)
4651 struct se_device
*dev
= cmd
->se_dev
;
4652 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4655 switch (tmr
->function
) {
4656 case TMR_ABORT_TASK
:
4657 tmr
->response
= TMR_FUNCTION_REJECTED
;
4659 case TMR_ABORT_TASK_SET
:
4661 case TMR_CLEAR_TASK_SET
:
4662 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4665 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4666 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4667 TMR_FUNCTION_REJECTED
;
4669 case TMR_TARGET_WARM_RESET
:
4670 tmr
->response
= TMR_FUNCTION_REJECTED
;
4672 case TMR_TARGET_COLD_RESET
:
4673 tmr
->response
= TMR_FUNCTION_REJECTED
;
4676 pr_err("Uknown TMR function: 0x%02x.\n",
4678 tmr
->response
= TMR_FUNCTION_REJECTED
;
4682 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4683 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4685 transport_cmd_check_stop_to_fabric(cmd
);
4689 /* transport_processing_thread():
4693 static int transport_processing_thread(void *param
)
4697 struct se_device
*dev
= param
;
4699 while (!kthread_should_stop()) {
4700 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4701 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4702 kthread_should_stop());
4707 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4711 switch (cmd
->t_state
) {
4712 case TRANSPORT_NEW_CMD
:
4715 case TRANSPORT_NEW_CMD_MAP
:
4716 if (!cmd
->se_tfo
->new_cmd_map
) {
4717 pr_err("cmd->se_tfo->new_cmd_map is"
4718 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4721 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4723 transport_generic_request_failure(cmd
);
4726 ret
= transport_generic_new_cmd(cmd
);
4728 transport_generic_request_failure(cmd
);
4732 case TRANSPORT_PROCESS_WRITE
:
4733 transport_generic_process_write(cmd
);
4735 case TRANSPORT_PROCESS_TMR
:
4736 transport_generic_do_tmr(cmd
);
4738 case TRANSPORT_COMPLETE_QF_WP
:
4739 transport_write_pending_qf(cmd
);
4741 case TRANSPORT_COMPLETE_QF_OK
:
4742 transport_complete_qf(cmd
);
4745 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4746 "i_state: %d on SE LUN: %u\n",
4748 cmd
->se_tfo
->get_task_tag(cmd
),
4749 cmd
->se_tfo
->get_cmd_state(cmd
),
4750 cmd
->se_lun
->unpacked_lun
);
4758 WARN_ON(!list_empty(&dev
->state_task_list
));
4759 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4760 dev
->process_thread
= NULL
;