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 <asm/unaligned.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_tcq.h>
46 #include <target/target_core_base.h>
47 #include <target/target_core_device.h>
48 #include <target/target_core_tmr.h>
49 #include <target/target_core_tpg.h>
50 #include <target/target_core_transport.h>
51 #include <target/target_core_fabric_ops.h>
52 #include <target/target_core_configfs.h>
54 #include "target_core_alua.h"
55 #include "target_core_hba.h"
56 #include "target_core_pr.h"
57 #include "target_core_ua.h"
59 static int sub_api_initialized
;
61 static struct workqueue_struct
*target_completion_wq
;
62 static struct kmem_cache
*se_cmd_cache
;
63 static struct kmem_cache
*se_sess_cache
;
64 struct kmem_cache
*se_tmr_req_cache
;
65 struct kmem_cache
*se_ua_cache
;
66 struct kmem_cache
*t10_pr_reg_cache
;
67 struct kmem_cache
*t10_alua_lu_gp_cache
;
68 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
69 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
70 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
72 static int transport_generic_write_pending(struct se_cmd
*);
73 static int transport_processing_thread(void *param
);
74 static int __transport_execute_tasks(struct se_device
*dev
);
75 static void transport_complete_task_attr(struct se_cmd
*cmd
);
76 static void transport_handle_queue_full(struct se_cmd
*cmd
,
77 struct se_device
*dev
);
78 static void transport_direct_request_timeout(struct se_cmd
*cmd
);
79 static void transport_free_dev_tasks(struct se_cmd
*cmd
);
80 static u32
transport_allocate_tasks(struct se_cmd
*cmd
,
81 unsigned long long starting_lba
,
82 enum dma_data_direction data_direction
,
83 struct scatterlist
*sgl
, unsigned int nents
);
84 static int transport_generic_get_mem(struct se_cmd
*cmd
);
85 static void transport_put_cmd(struct se_cmd
*cmd
);
86 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
);
87 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
88 static void transport_generic_request_failure(struct se_cmd
*, int, int);
89 static void target_complete_ok_work(struct work_struct
*work
);
91 int init_se_kmem_caches(void)
93 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
94 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
96 pr_err("kmem_cache_create for struct se_cmd failed\n");
99 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
100 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
102 if (!se_tmr_req_cache
) {
103 pr_err("kmem_cache_create() for struct se_tmr_req"
105 goto out_free_cmd_cache
;
107 se_sess_cache
= kmem_cache_create("se_sess_cache",
108 sizeof(struct se_session
), __alignof__(struct se_session
),
110 if (!se_sess_cache
) {
111 pr_err("kmem_cache_create() for struct se_session"
113 goto out_free_tmr_req_cache
;
115 se_ua_cache
= kmem_cache_create("se_ua_cache",
116 sizeof(struct se_ua
), __alignof__(struct se_ua
),
119 pr_err("kmem_cache_create() for struct se_ua failed\n");
120 goto out_free_sess_cache
;
122 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
123 sizeof(struct t10_pr_registration
),
124 __alignof__(struct t10_pr_registration
), 0, NULL
);
125 if (!t10_pr_reg_cache
) {
126 pr_err("kmem_cache_create() for struct t10_pr_registration"
128 goto out_free_ua_cache
;
130 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
131 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
133 if (!t10_alua_lu_gp_cache
) {
134 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
136 goto out_free_pr_reg_cache
;
138 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
139 sizeof(struct t10_alua_lu_gp_member
),
140 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
141 if (!t10_alua_lu_gp_mem_cache
) {
142 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
144 goto out_free_lu_gp_cache
;
146 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
147 sizeof(struct t10_alua_tg_pt_gp
),
148 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
149 if (!t10_alua_tg_pt_gp_cache
) {
150 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
152 goto out_free_lu_gp_mem_cache
;
154 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
155 "t10_alua_tg_pt_gp_mem_cache",
156 sizeof(struct t10_alua_tg_pt_gp_member
),
157 __alignof__(struct t10_alua_tg_pt_gp_member
),
159 if (!t10_alua_tg_pt_gp_mem_cache
) {
160 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
162 goto out_free_tg_pt_gp_cache
;
165 target_completion_wq
= alloc_workqueue("target_completion",
167 if (!target_completion_wq
)
168 goto out_free_tg_pt_gp_mem_cache
;
172 out_free_tg_pt_gp_mem_cache
:
173 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
174 out_free_tg_pt_gp_cache
:
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
176 out_free_lu_gp_mem_cache
:
177 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
178 out_free_lu_gp_cache
:
179 kmem_cache_destroy(t10_alua_lu_gp_cache
);
180 out_free_pr_reg_cache
:
181 kmem_cache_destroy(t10_pr_reg_cache
);
183 kmem_cache_destroy(se_ua_cache
);
185 kmem_cache_destroy(se_sess_cache
);
186 out_free_tmr_req_cache
:
187 kmem_cache_destroy(se_tmr_req_cache
);
189 kmem_cache_destroy(se_cmd_cache
);
194 void release_se_kmem_caches(void)
196 destroy_workqueue(target_completion_wq
);
197 kmem_cache_destroy(se_cmd_cache
);
198 kmem_cache_destroy(se_tmr_req_cache
);
199 kmem_cache_destroy(se_sess_cache
);
200 kmem_cache_destroy(se_ua_cache
);
201 kmem_cache_destroy(t10_pr_reg_cache
);
202 kmem_cache_destroy(t10_alua_lu_gp_cache
);
203 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
205 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
208 /* This code ensures unique mib indexes are handed out. */
209 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
210 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
213 * Allocate a new row index for the entry type specified
215 u32
scsi_get_new_index(scsi_index_t type
)
219 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
221 spin_lock(&scsi_mib_index_lock
);
222 new_index
= ++scsi_mib_index
[type
];
223 spin_unlock(&scsi_mib_index_lock
);
228 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
230 atomic_set(&qobj
->queue_cnt
, 0);
231 INIT_LIST_HEAD(&qobj
->qobj_list
);
232 init_waitqueue_head(&qobj
->thread_wq
);
233 spin_lock_init(&qobj
->cmd_queue_lock
);
235 EXPORT_SYMBOL(transport_init_queue_obj
);
237 static int transport_subsystem_reqmods(void)
241 ret
= request_module("target_core_iblock");
243 pr_err("Unable to load target_core_iblock\n");
245 ret
= request_module("target_core_file");
247 pr_err("Unable to load target_core_file\n");
249 ret
= request_module("target_core_pscsi");
251 pr_err("Unable to load target_core_pscsi\n");
253 ret
= request_module("target_core_stgt");
255 pr_err("Unable to load target_core_stgt\n");
260 int transport_subsystem_check_init(void)
264 if (sub_api_initialized
)
267 * Request the loading of known TCM subsystem plugins..
269 ret
= transport_subsystem_reqmods();
273 sub_api_initialized
= 1;
277 struct se_session
*transport_init_session(void)
279 struct se_session
*se_sess
;
281 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
283 pr_err("Unable to allocate struct se_session from"
285 return ERR_PTR(-ENOMEM
);
287 INIT_LIST_HEAD(&se_sess
->sess_list
);
288 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
292 EXPORT_SYMBOL(transport_init_session
);
295 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
297 void __transport_register_session(
298 struct se_portal_group
*se_tpg
,
299 struct se_node_acl
*se_nacl
,
300 struct se_session
*se_sess
,
301 void *fabric_sess_ptr
)
303 unsigned char buf
[PR_REG_ISID_LEN
];
305 se_sess
->se_tpg
= se_tpg
;
306 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
308 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
310 * Only set for struct se_session's that will actually be moving I/O.
311 * eg: *NOT* discovery sessions.
315 * If the fabric module supports an ISID based TransportID,
316 * save this value in binary from the fabric I_T Nexus now.
318 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
319 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
320 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
321 &buf
[0], PR_REG_ISID_LEN
);
322 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
324 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
326 * The se_nacl->nacl_sess pointer will be set to the
327 * last active I_T Nexus for each struct se_node_acl.
329 se_nacl
->nacl_sess
= se_sess
;
331 list_add_tail(&se_sess
->sess_acl_list
,
332 &se_nacl
->acl_sess_list
);
333 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
335 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
337 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
338 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
340 EXPORT_SYMBOL(__transport_register_session
);
342 void transport_register_session(
343 struct se_portal_group
*se_tpg
,
344 struct se_node_acl
*se_nacl
,
345 struct se_session
*se_sess
,
346 void *fabric_sess_ptr
)
348 spin_lock_bh(&se_tpg
->session_lock
);
349 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
350 spin_unlock_bh(&se_tpg
->session_lock
);
352 EXPORT_SYMBOL(transport_register_session
);
354 void transport_deregister_session_configfs(struct se_session
*se_sess
)
356 struct se_node_acl
*se_nacl
;
359 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
361 se_nacl
= se_sess
->se_node_acl
;
363 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
364 list_del(&se_sess
->sess_acl_list
);
366 * If the session list is empty, then clear the pointer.
367 * Otherwise, set the struct se_session pointer from the tail
368 * element of the per struct se_node_acl active session list.
370 if (list_empty(&se_nacl
->acl_sess_list
))
371 se_nacl
->nacl_sess
= NULL
;
373 se_nacl
->nacl_sess
= container_of(
374 se_nacl
->acl_sess_list
.prev
,
375 struct se_session
, sess_acl_list
);
377 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
380 EXPORT_SYMBOL(transport_deregister_session_configfs
);
382 void transport_free_session(struct se_session
*se_sess
)
384 kmem_cache_free(se_sess_cache
, se_sess
);
386 EXPORT_SYMBOL(transport_free_session
);
388 void transport_deregister_session(struct se_session
*se_sess
)
390 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
391 struct se_node_acl
*se_nacl
;
395 transport_free_session(se_sess
);
399 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
400 list_del(&se_sess
->sess_list
);
401 se_sess
->se_tpg
= NULL
;
402 se_sess
->fabric_sess_ptr
= NULL
;
403 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
406 * Determine if we need to do extra work for this initiator node's
407 * struct se_node_acl if it had been previously dynamically generated.
409 se_nacl
= se_sess
->se_node_acl
;
411 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
412 if (se_nacl
->dynamic_node_acl
) {
413 if (!se_tpg
->se_tpg_tfo
->tpg_check_demo_mode_cache(
415 list_del(&se_nacl
->acl_list
);
416 se_tpg
->num_node_acls
--;
417 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
419 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
420 core_free_device_list_for_node(se_nacl
, se_tpg
);
421 se_tpg
->se_tpg_tfo
->tpg_release_fabric_acl(se_tpg
,
423 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
426 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
429 transport_free_session(se_sess
);
431 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
432 se_tpg
->se_tpg_tfo
->get_fabric_name());
434 EXPORT_SYMBOL(transport_deregister_session
);
437 * Called with cmd->t_state_lock held.
439 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
441 struct se_device
*dev
= cmd
->se_dev
;
442 struct se_task
*task
;
448 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
449 if (task
->task_flags
& TF_ACTIVE
)
452 if (!atomic_read(&task
->task_state_active
))
455 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
456 list_del(&task
->t_state_list
);
457 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
458 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
459 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
461 atomic_set(&task
->task_state_active
, 0);
462 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
466 /* transport_cmd_check_stop():
468 * 'transport_off = 1' determines if t_transport_active should be cleared.
469 * 'transport_off = 2' determines if task_dev_state should be removed.
471 * A non-zero u8 t_state sets cmd->t_state.
472 * Returns 1 when command is stopped, else 0.
474 static int transport_cmd_check_stop(
481 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
483 * Determine if IOCTL context caller in requesting the stopping of this
484 * command for LUN shutdown purposes.
486 if (atomic_read(&cmd
->transport_lun_stop
)) {
487 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
488 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
489 cmd
->se_tfo
->get_task_tag(cmd
));
491 atomic_set(&cmd
->t_transport_active
, 0);
492 if (transport_off
== 2)
493 transport_all_task_dev_remove_state(cmd
);
494 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
496 complete(&cmd
->transport_lun_stop_comp
);
500 * Determine if frontend context caller is requesting the stopping of
501 * this command for frontend exceptions.
503 if (atomic_read(&cmd
->t_transport_stop
)) {
504 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
505 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
506 cmd
->se_tfo
->get_task_tag(cmd
));
508 if (transport_off
== 2)
509 transport_all_task_dev_remove_state(cmd
);
512 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
515 if (transport_off
== 2)
517 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
519 complete(&cmd
->t_transport_stop_comp
);
523 atomic_set(&cmd
->t_transport_active
, 0);
524 if (transport_off
== 2) {
525 transport_all_task_dev_remove_state(cmd
);
527 * Clear struct se_cmd->se_lun before the transport_off == 2
528 * handoff to fabric module.
532 * Some fabric modules like tcm_loop can release
533 * their internally allocated I/O reference now and
536 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
537 spin_unlock_irqrestore(
538 &cmd
->t_state_lock
, flags
);
540 cmd
->se_tfo
->check_stop_free(cmd
);
544 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
548 cmd
->t_state
= t_state
;
549 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
554 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
556 return transport_cmd_check_stop(cmd
, 2, 0);
559 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
561 struct se_lun
*lun
= cmd
->se_lun
;
567 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
568 if (!atomic_read(&cmd
->transport_dev_active
)) {
569 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
572 atomic_set(&cmd
->transport_dev_active
, 0);
573 transport_all_task_dev_remove_state(cmd
);
574 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
578 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
579 if (atomic_read(&cmd
->transport_lun_active
)) {
580 list_del(&cmd
->se_lun_node
);
581 atomic_set(&cmd
->transport_lun_active
, 0);
583 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
584 cmd
->se_tfo
->get_task_tag(cmd
), lun
->unpacked_lun
);
587 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
590 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
592 if (!cmd
->se_tmr_req
)
593 transport_lun_remove_cmd(cmd
);
595 if (transport_cmd_check_stop_to_fabric(cmd
))
598 transport_remove_cmd_from_queue(cmd
);
599 transport_put_cmd(cmd
);
603 static void transport_add_cmd_to_queue(struct se_cmd
*cmd
, int t_state
,
606 struct se_device
*dev
= cmd
->se_dev
;
607 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
611 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
612 cmd
->t_state
= t_state
;
613 atomic_set(&cmd
->t_transport_active
, 1);
614 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
617 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
619 /* If the cmd is already on the list, remove it before we add it */
620 if (!list_empty(&cmd
->se_queue_node
))
621 list_del(&cmd
->se_queue_node
);
623 atomic_inc(&qobj
->queue_cnt
);
626 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
628 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
629 atomic_set(&cmd
->t_transport_queue_active
, 1);
630 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
632 wake_up_interruptible(&qobj
->thread_wq
);
635 static struct se_cmd
*
636 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
641 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
642 if (list_empty(&qobj
->qobj_list
)) {
643 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
646 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
648 atomic_set(&cmd
->t_transport_queue_active
, 0);
650 list_del_init(&cmd
->se_queue_node
);
651 atomic_dec(&qobj
->queue_cnt
);
652 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
657 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
)
659 struct se_queue_obj
*qobj
= &cmd
->se_dev
->dev_queue_obj
;
662 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
663 if (!atomic_read(&cmd
->t_transport_queue_active
)) {
664 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
667 atomic_set(&cmd
->t_transport_queue_active
, 0);
668 atomic_dec(&qobj
->queue_cnt
);
669 list_del_init(&cmd
->se_queue_node
);
670 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
672 if (atomic_read(&cmd
->t_transport_queue_active
)) {
673 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
674 cmd
->se_tfo
->get_task_tag(cmd
),
675 atomic_read(&cmd
->t_transport_queue_active
));
680 * Completion function used by TCM subsystem plugins (such as FILEIO)
681 * for queueing up response from struct se_subsystem_api->do_task()
683 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
685 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
686 struct se_task
, t_list
);
689 cmd
->scsi_status
= SAM_STAT_GOOD
;
690 task
->task_scsi_status
= GOOD
;
692 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
693 task
->task_error_status
= PYX_TRANSPORT_ILLEGAL_REQUEST
;
694 task
->task_se_cmd
->transport_error_status
=
695 PYX_TRANSPORT_ILLEGAL_REQUEST
;
698 transport_complete_task(task
, good
);
700 EXPORT_SYMBOL(transport_complete_sync_cache
);
702 static void target_complete_timeout_work(struct work_struct
*work
)
704 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
708 * Reset cmd->t_se_count to allow transport_put_cmd()
709 * to allow last call to free memory resources.
711 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
712 if (atomic_read(&cmd
->t_transport_timeout
) > 1) {
713 int tmp
= (atomic_read(&cmd
->t_transport_timeout
) - 1);
715 atomic_sub(tmp
, &cmd
->t_se_count
);
717 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
719 transport_put_cmd(cmd
);
722 static void target_complete_failure_work(struct work_struct
*work
)
724 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
726 transport_generic_request_failure(cmd
, 1, 1);
729 /* transport_complete_task():
731 * Called from interrupt and non interrupt context depending
732 * on the transport plugin.
734 void transport_complete_task(struct se_task
*task
, int success
)
736 struct se_cmd
*cmd
= task
->task_se_cmd
;
737 struct se_device
*dev
= cmd
->se_dev
;
740 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
741 cmd
->t_task_cdb
[0], dev
);
744 atomic_inc(&dev
->depth_left
);
746 del_timer(&task
->task_timer
);
748 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
749 task
->task_flags
&= ~TF_ACTIVE
;
752 * See if any sense data exists, if so set the TASK_SENSE flag.
753 * Also check for any other post completion work that needs to be
754 * done by the plugins.
756 if (dev
&& dev
->transport
->transport_complete
) {
757 if (dev
->transport
->transport_complete(task
) != 0) {
758 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
759 task
->task_sense
= 1;
765 * See if we are waiting for outstanding struct se_task
766 * to complete for an exception condition
768 if (task
->task_flags
& TF_REQUEST_STOP
) {
770 * Decrement cmd->t_se_count if this task had
771 * previously thrown its timeout exception handler.
773 if (task
->task_flags
& TF_TIMEOUT
) {
774 atomic_dec(&cmd
->t_se_count
);
775 task
->task_flags
&= ~TF_TIMEOUT
;
777 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
779 complete(&task
->task_stop_comp
);
783 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
784 * left counter to determine when the struct se_cmd is ready to be queued to
785 * the processing thread.
787 if (task
->task_flags
& TF_TIMEOUT
) {
788 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_timeout_left
)) {
789 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
792 INIT_WORK(&cmd
->work
, target_complete_timeout_work
);
795 atomic_dec(&cmd
->t_task_cdbs_timeout_left
);
798 * Decrement the outstanding t_task_cdbs_left count. The last
799 * struct se_task from struct se_cmd will complete itself into the
800 * device queue depending upon int success.
802 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
803 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
807 if (!success
|| cmd
->t_tasks_failed
) {
808 if (!task
->task_error_status
) {
809 task
->task_error_status
=
810 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
811 cmd
->transport_error_status
=
812 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
814 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
816 atomic_set(&cmd
->t_transport_complete
, 1);
817 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
821 cmd
->t_state
= TRANSPORT_COMPLETE
;
822 atomic_set(&cmd
->t_transport_active
, 1);
823 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
825 queue_work(target_completion_wq
, &cmd
->work
);
827 EXPORT_SYMBOL(transport_complete_task
);
830 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
831 * struct se_task list are ready to be added to the active execution list
834 * Called with se_dev_t->execute_task_lock called.
836 static inline int transport_add_task_check_sam_attr(
837 struct se_task
*task
,
838 struct se_task
*task_prev
,
839 struct se_device
*dev
)
842 * No SAM Task attribute emulation enabled, add to tail of
845 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
846 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
850 * HEAD_OF_QUEUE attribute for received CDB, which means
851 * the first task that is associated with a struct se_cmd goes to
852 * head of the struct se_device->execute_task_list, and task_prev
853 * after that for each subsequent task
855 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
856 list_add(&task
->t_execute_list
,
857 (task_prev
!= NULL
) ?
858 &task_prev
->t_execute_list
:
859 &dev
->execute_task_list
);
861 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
862 " in execution queue\n",
863 task
->task_se_cmd
->t_task_cdb
[0]);
867 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
868 * transitioned from Dermant -> Active state, and are added to the end
869 * of the struct se_device->execute_task_list
871 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
875 /* __transport_add_task_to_execute_queue():
877 * Called with se_dev_t->execute_task_lock called.
879 static void __transport_add_task_to_execute_queue(
880 struct se_task
*task
,
881 struct se_task
*task_prev
,
882 struct se_device
*dev
)
886 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
887 atomic_inc(&dev
->execute_tasks
);
889 if (atomic_read(&task
->task_state_active
))
892 * Determine if this task needs to go to HEAD_OF_QUEUE for the
893 * state list as well. Running with SAM Task Attribute emulation
894 * will always return head_of_queue == 0 here
897 list_add(&task
->t_state_list
, (task_prev
) ?
898 &task_prev
->t_state_list
:
899 &dev
->state_task_list
);
901 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
903 atomic_set(&task
->task_state_active
, 1);
905 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
906 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
910 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
912 struct se_device
*dev
= cmd
->se_dev
;
913 struct se_task
*task
;
916 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
917 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
918 if (atomic_read(&task
->task_state_active
))
921 spin_lock(&dev
->execute_task_lock
);
922 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
923 atomic_set(&task
->task_state_active
, 1);
925 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
926 task
->task_se_cmd
->se_tfo
->get_task_tag(
927 task
->task_se_cmd
), task
, dev
);
929 spin_unlock(&dev
->execute_task_lock
);
931 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
934 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
936 struct se_device
*dev
= cmd
->se_dev
;
937 struct se_task
*task
, *task_prev
= NULL
;
940 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
941 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
942 if (!list_empty(&task
->t_execute_list
))
945 * __transport_add_task_to_execute_queue() handles the
946 * SAM Task Attribute emulation if enabled
948 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
951 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
954 void __transport_remove_task_from_execute_queue(struct se_task
*task
,
955 struct se_device
*dev
)
957 list_del_init(&task
->t_execute_list
);
958 atomic_dec(&dev
->execute_tasks
);
961 void transport_remove_task_from_execute_queue(
962 struct se_task
*task
,
963 struct se_device
*dev
)
967 if (WARN_ON(list_empty(&task
->t_execute_list
)))
970 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
971 __transport_remove_task_from_execute_queue(task
, dev
);
972 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
976 * Handle QUEUE_FULL / -EAGAIN status
979 static void target_qf_do_work(struct work_struct
*work
)
981 struct se_device
*dev
= container_of(work
, struct se_device
,
983 LIST_HEAD(qf_cmd_list
);
984 struct se_cmd
*cmd
, *cmd_tmp
;
986 spin_lock_irq(&dev
->qf_cmd_lock
);
987 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
988 spin_unlock_irq(&dev
->qf_cmd_lock
);
990 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
991 list_del(&cmd
->se_qf_node
);
992 atomic_dec(&dev
->dev_qf_count
);
993 smp_mb__after_atomic_dec();
995 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
996 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
997 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
998 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
1001 transport_add_cmd_to_queue(cmd
, cmd
->t_state
, true);
1005 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
1007 switch (cmd
->data_direction
) {
1010 case DMA_FROM_DEVICE
:
1014 case DMA_BIDIRECTIONAL
:
1023 void transport_dump_dev_state(
1024 struct se_device
*dev
,
1028 *bl
+= sprintf(b
+ *bl
, "Status: ");
1029 switch (dev
->dev_status
) {
1030 case TRANSPORT_DEVICE_ACTIVATED
:
1031 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1033 case TRANSPORT_DEVICE_DEACTIVATED
:
1034 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1036 case TRANSPORT_DEVICE_SHUTDOWN
:
1037 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1039 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1040 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1041 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1044 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1048 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1049 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1051 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1052 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
1053 *bl
+= sprintf(b
+ *bl
, " ");
1056 void transport_dump_vpd_proto_id(
1057 struct t10_vpd
*vpd
,
1058 unsigned char *p_buf
,
1061 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1064 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1065 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1067 switch (vpd
->protocol_identifier
) {
1069 sprintf(buf
+len
, "Fibre Channel\n");
1072 sprintf(buf
+len
, "Parallel SCSI\n");
1075 sprintf(buf
+len
, "SSA\n");
1078 sprintf(buf
+len
, "IEEE 1394\n");
1081 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1085 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1088 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1091 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1095 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1098 sprintf(buf
+len
, "Unknown 0x%02x\n",
1099 vpd
->protocol_identifier
);
1104 strncpy(p_buf
, buf
, p_buf_len
);
1106 pr_debug("%s", buf
);
1110 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1113 * Check if the Protocol Identifier Valid (PIV) bit is set..
1115 * from spc3r23.pdf section 7.5.1
1117 if (page_83
[1] & 0x80) {
1118 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1119 vpd
->protocol_identifier_set
= 1;
1120 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1123 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1125 int transport_dump_vpd_assoc(
1126 struct t10_vpd
*vpd
,
1127 unsigned char *p_buf
,
1130 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1134 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1135 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1137 switch (vpd
->association
) {
1139 sprintf(buf
+len
, "addressed logical unit\n");
1142 sprintf(buf
+len
, "target port\n");
1145 sprintf(buf
+len
, "SCSI target device\n");
1148 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1154 strncpy(p_buf
, buf
, p_buf_len
);
1156 pr_debug("%s", buf
);
1161 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1164 * The VPD identification association..
1166 * from spc3r23.pdf Section 7.6.3.1 Table 297
1168 vpd
->association
= (page_83
[1] & 0x30);
1169 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1171 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1173 int transport_dump_vpd_ident_type(
1174 struct t10_vpd
*vpd
,
1175 unsigned char *p_buf
,
1178 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1182 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1183 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1185 switch (vpd
->device_identifier_type
) {
1187 sprintf(buf
+len
, "Vendor specific\n");
1190 sprintf(buf
+len
, "T10 Vendor ID based\n");
1193 sprintf(buf
+len
, "EUI-64 based\n");
1196 sprintf(buf
+len
, "NAA\n");
1199 sprintf(buf
+len
, "Relative target port identifier\n");
1202 sprintf(buf
+len
, "SCSI name string\n");
1205 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1206 vpd
->device_identifier_type
);
1212 if (p_buf_len
< strlen(buf
)+1)
1214 strncpy(p_buf
, buf
, p_buf_len
);
1216 pr_debug("%s", buf
);
1222 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1225 * The VPD identifier type..
1227 * from spc3r23.pdf Section 7.6.3.1 Table 298
1229 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1230 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1232 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1234 int transport_dump_vpd_ident(
1235 struct t10_vpd
*vpd
,
1236 unsigned char *p_buf
,
1239 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1242 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1244 switch (vpd
->device_identifier_code_set
) {
1245 case 0x01: /* Binary */
1246 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1247 &vpd
->device_identifier
[0]);
1249 case 0x02: /* ASCII */
1250 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1251 &vpd
->device_identifier
[0]);
1253 case 0x03: /* UTF-8 */
1254 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1255 &vpd
->device_identifier
[0]);
1258 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1259 " 0x%02x", vpd
->device_identifier_code_set
);
1265 strncpy(p_buf
, buf
, p_buf_len
);
1267 pr_debug("%s", buf
);
1273 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1275 static const char hex_str
[] = "0123456789abcdef";
1276 int j
= 0, i
= 4; /* offset to start of the identifer */
1279 * The VPD Code Set (encoding)
1281 * from spc3r23.pdf Section 7.6.3.1 Table 296
1283 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1284 switch (vpd
->device_identifier_code_set
) {
1285 case 0x01: /* Binary */
1286 vpd
->device_identifier
[j
++] =
1287 hex_str
[vpd
->device_identifier_type
];
1288 while (i
< (4 + page_83
[3])) {
1289 vpd
->device_identifier
[j
++] =
1290 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1291 vpd
->device_identifier
[j
++] =
1292 hex_str
[page_83
[i
] & 0x0f];
1296 case 0x02: /* ASCII */
1297 case 0x03: /* UTF-8 */
1298 while (i
< (4 + page_83
[3]))
1299 vpd
->device_identifier
[j
++] = page_83
[i
++];
1305 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1307 EXPORT_SYMBOL(transport_set_vpd_ident
);
1309 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1312 * If this device is from Target_Core_Mod/pSCSI, disable the
1313 * SAM Task Attribute emulation.
1315 * This is currently not available in upsream Linux/SCSI Target
1316 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1318 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1319 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1323 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1324 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1325 " device\n", dev
->transport
->name
,
1326 dev
->transport
->get_device_rev(dev
));
1329 static void scsi_dump_inquiry(struct se_device
*dev
)
1331 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1334 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1336 pr_debug(" Vendor: ");
1337 for (i
= 0; i
< 8; i
++)
1338 if (wwn
->vendor
[i
] >= 0x20)
1339 pr_debug("%c", wwn
->vendor
[i
]);
1343 pr_debug(" Model: ");
1344 for (i
= 0; i
< 16; i
++)
1345 if (wwn
->model
[i
] >= 0x20)
1346 pr_debug("%c", wwn
->model
[i
]);
1350 pr_debug(" Revision: ");
1351 for (i
= 0; i
< 4; i
++)
1352 if (wwn
->revision
[i
] >= 0x20)
1353 pr_debug("%c", wwn
->revision
[i
]);
1359 device_type
= dev
->transport
->get_device_type(dev
);
1360 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1361 pr_debug(" ANSI SCSI revision: %02x\n",
1362 dev
->transport
->get_device_rev(dev
));
1365 struct se_device
*transport_add_device_to_core_hba(
1367 struct se_subsystem_api
*transport
,
1368 struct se_subsystem_dev
*se_dev
,
1370 void *transport_dev
,
1371 struct se_dev_limits
*dev_limits
,
1372 const char *inquiry_prod
,
1373 const char *inquiry_rev
)
1376 struct se_device
*dev
;
1378 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1380 pr_err("Unable to allocate memory for se_dev_t\n");
1384 transport_init_queue_obj(&dev
->dev_queue_obj
);
1385 dev
->dev_flags
= device_flags
;
1386 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1387 dev
->dev_ptr
= transport_dev
;
1389 dev
->se_sub_dev
= se_dev
;
1390 dev
->transport
= transport
;
1391 atomic_set(&dev
->active_cmds
, 0);
1392 INIT_LIST_HEAD(&dev
->dev_list
);
1393 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1394 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1395 INIT_LIST_HEAD(&dev
->execute_task_list
);
1396 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1397 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1398 INIT_LIST_HEAD(&dev
->state_task_list
);
1399 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1400 spin_lock_init(&dev
->execute_task_lock
);
1401 spin_lock_init(&dev
->delayed_cmd_lock
);
1402 spin_lock_init(&dev
->ordered_cmd_lock
);
1403 spin_lock_init(&dev
->state_task_lock
);
1404 spin_lock_init(&dev
->dev_alua_lock
);
1405 spin_lock_init(&dev
->dev_reservation_lock
);
1406 spin_lock_init(&dev
->dev_status_lock
);
1407 spin_lock_init(&dev
->dev_status_thr_lock
);
1408 spin_lock_init(&dev
->se_port_lock
);
1409 spin_lock_init(&dev
->se_tmr_lock
);
1410 spin_lock_init(&dev
->qf_cmd_lock
);
1412 dev
->queue_depth
= dev_limits
->queue_depth
;
1413 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1414 atomic_set(&dev
->dev_ordered_id
, 0);
1416 se_dev_set_default_attribs(dev
, dev_limits
);
1418 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1419 dev
->creation_time
= get_jiffies_64();
1420 spin_lock_init(&dev
->stats_lock
);
1422 spin_lock(&hba
->device_lock
);
1423 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1425 spin_unlock(&hba
->device_lock
);
1427 * Setup the SAM Task Attribute emulation for struct se_device
1429 core_setup_task_attr_emulation(dev
);
1431 * Force PR and ALUA passthrough emulation with internal object use.
1433 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1435 * Setup the Reservations infrastructure for struct se_device
1437 core_setup_reservations(dev
, force_pt
);
1439 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1441 if (core_setup_alua(dev
, force_pt
) < 0)
1445 * Startup the struct se_device processing thread
1447 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1448 "LIO_%s", dev
->transport
->name
);
1449 if (IS_ERR(dev
->process_thread
)) {
1450 pr_err("Unable to create kthread: LIO_%s\n",
1451 dev
->transport
->name
);
1455 * Setup work_queue for QUEUE_FULL
1457 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1459 * Preload the initial INQUIRY const values if we are doing
1460 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1461 * passthrough because this is being provided by the backend LLD.
1462 * This is required so that transport_get_inquiry() copies these
1463 * originals once back into DEV_T10_WWN(dev) for the virtual device
1466 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1467 if (!inquiry_prod
|| !inquiry_rev
) {
1468 pr_err("All non TCM/pSCSI plugins require"
1469 " INQUIRY consts\n");
1473 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1474 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1475 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1477 scsi_dump_inquiry(dev
);
1481 kthread_stop(dev
->process_thread
);
1483 spin_lock(&hba
->device_lock
);
1484 list_del(&dev
->dev_list
);
1486 spin_unlock(&hba
->device_lock
);
1488 se_release_vpd_for_dev(dev
);
1494 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1496 /* transport_generic_prepare_cdb():
1498 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1499 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1500 * The point of this is since we are mapping iSCSI LUNs to
1501 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1502 * devices and HBAs for a loop.
1504 static inline void transport_generic_prepare_cdb(
1508 case READ_10
: /* SBC - RDProtect */
1509 case READ_12
: /* SBC - RDProtect */
1510 case READ_16
: /* SBC - RDProtect */
1511 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1512 case VERIFY
: /* SBC - VRProtect */
1513 case VERIFY_16
: /* SBC - VRProtect */
1514 case WRITE_VERIFY
: /* SBC - VRProtect */
1515 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1518 cdb
[1] &= 0x1f; /* clear logical unit number */
1523 static struct se_task
*
1524 transport_generic_get_task(struct se_cmd
*cmd
,
1525 enum dma_data_direction data_direction
)
1527 struct se_task
*task
;
1528 struct se_device
*dev
= cmd
->se_dev
;
1530 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1532 pr_err("Unable to allocate struct se_task\n");
1536 INIT_LIST_HEAD(&task
->t_list
);
1537 INIT_LIST_HEAD(&task
->t_execute_list
);
1538 INIT_LIST_HEAD(&task
->t_state_list
);
1539 init_timer(&task
->task_timer
);
1540 init_completion(&task
->task_stop_comp
);
1541 task
->task_se_cmd
= cmd
;
1542 task
->task_data_direction
= data_direction
;
1547 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1550 * Used by fabric modules containing a local struct se_cmd within their
1551 * fabric dependent per I/O descriptor.
1553 void transport_init_se_cmd(
1555 struct target_core_fabric_ops
*tfo
,
1556 struct se_session
*se_sess
,
1560 unsigned char *sense_buffer
)
1562 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1563 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1564 INIT_LIST_HEAD(&cmd
->se_ordered_node
);
1565 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1566 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1568 INIT_LIST_HEAD(&cmd
->t_task_list
);
1569 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1570 init_completion(&cmd
->transport_lun_stop_comp
);
1571 init_completion(&cmd
->t_transport_stop_comp
);
1572 spin_lock_init(&cmd
->t_state_lock
);
1573 atomic_set(&cmd
->transport_dev_active
, 1);
1576 cmd
->se_sess
= se_sess
;
1577 cmd
->data_length
= data_length
;
1578 cmd
->data_direction
= data_direction
;
1579 cmd
->sam_task_attr
= task_attr
;
1580 cmd
->sense_buffer
= sense_buffer
;
1582 EXPORT_SYMBOL(transport_init_se_cmd
);
1584 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1587 * Check if SAM Task Attribute emulation is enabled for this
1588 * struct se_device storage object
1590 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1593 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1594 pr_debug("SAM Task Attribute ACA"
1595 " emulation is not supported\n");
1599 * Used to determine when ORDERED commands should go from
1600 * Dormant to Active status.
1602 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1603 smp_mb__after_atomic_inc();
1604 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1605 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1606 cmd
->se_dev
->transport
->name
);
1610 /* transport_generic_allocate_tasks():
1612 * Called from fabric RX Thread.
1614 int transport_generic_allocate_tasks(
1620 transport_generic_prepare_cdb(cdb
);
1622 * Ensure that the received CDB is less than the max (252 + 8) bytes
1623 * for VARIABLE_LENGTH_CMD
1625 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1626 pr_err("Received SCSI CDB with command_size: %d that"
1627 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1628 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1632 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1633 * allocate the additional extended CDB buffer now.. Otherwise
1634 * setup the pointer from __t_task_cdb to t_task_cdb.
1636 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1637 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1639 if (!cmd
->t_task_cdb
) {
1640 pr_err("Unable to allocate cmd->t_task_cdb"
1641 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1642 scsi_command_size(cdb
),
1643 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1647 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1649 * Copy the original CDB into cmd->
1651 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1653 * Setup the received CDB based on SCSI defined opcodes and
1654 * perform unit attention, persistent reservations and ALUA
1655 * checks for virtual device backends. The cmd->t_task_cdb
1656 * pointer is expected to be setup before we reach this point.
1658 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1662 * Check for SAM Task Attribute Emulation
1664 if (transport_check_alloc_task_attr(cmd
) < 0) {
1665 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1666 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1669 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1670 if (cmd
->se_lun
->lun_sep
)
1671 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1672 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1675 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1678 * Used by fabric module frontends to queue tasks directly.
1679 * Many only be used from process context only
1681 int transport_handle_cdb_direct(
1688 pr_err("cmd->se_lun is NULL\n");
1691 if (in_interrupt()) {
1693 pr_err("transport_generic_handle_cdb cannot be called"
1694 " from interrupt context\n");
1698 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1699 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1700 * in existing usage to ensure that outstanding descriptors are handled
1701 * correctly during shutdown via transport_wait_for_tasks()
1703 * Also, we don't take cmd->t_state_lock here as we only expect
1704 * this to be called for initial descriptor submission.
1706 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1707 atomic_set(&cmd
->t_transport_active
, 1);
1709 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1710 * so follow TRANSPORT_NEW_CMD processing thread context usage
1711 * and call transport_generic_request_failure() if necessary..
1713 ret
= transport_generic_new_cmd(cmd
);
1717 cmd
->transport_error_status
= ret
;
1718 transport_generic_request_failure(cmd
, 0,
1719 (cmd
->data_direction
!= DMA_TO_DEVICE
));
1723 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1726 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1727 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1728 * complete setup in TCM process context w/ TFO->new_cmd_map().
1730 int transport_generic_handle_cdb_map(
1735 pr_err("cmd->se_lun is NULL\n");
1739 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
, false);
1742 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1744 /* transport_generic_handle_data():
1748 int transport_generic_handle_data(
1752 * For the software fabric case, then we assume the nexus is being
1753 * failed/shutdown when signals are pending from the kthread context
1754 * caller, so we return a failure. For the HW target mode case running
1755 * in interrupt code, the signal_pending() check is skipped.
1757 if (!in_interrupt() && signal_pending(current
))
1760 * If the received CDB has aleady been ABORTED by the generic
1761 * target engine, we now call transport_check_aborted_status()
1762 * to queue any delated TASK_ABORTED status for the received CDB to the
1763 * fabric module as we are expecting no further incoming DATA OUT
1764 * sequences at this point.
1766 if (transport_check_aborted_status(cmd
, 1) != 0)
1769 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
, false);
1772 EXPORT_SYMBOL(transport_generic_handle_data
);
1774 /* transport_generic_handle_tmr():
1778 int transport_generic_handle_tmr(
1781 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
, false);
1784 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1786 void transport_generic_free_cmd_intr(
1789 transport_add_cmd_to_queue(cmd
, TRANSPORT_FREE_CMD_INTR
, false);
1791 EXPORT_SYMBOL(transport_generic_free_cmd_intr
);
1794 * If the task is active, request it to be stopped and sleep until it
1797 bool target_stop_task(struct se_task
*task
, unsigned long *flags
)
1799 struct se_cmd
*cmd
= task
->task_se_cmd
;
1800 bool was_active
= false;
1802 if (task
->task_flags
& TF_ACTIVE
) {
1803 task
->task_flags
|= TF_REQUEST_STOP
;
1804 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1806 pr_debug("Task %p waiting to complete\n", task
);
1807 del_timer_sync(&task
->task_timer
);
1808 wait_for_completion(&task
->task_stop_comp
);
1809 pr_debug("Task %p stopped successfully\n", task
);
1811 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1812 atomic_dec(&cmd
->t_task_cdbs_left
);
1813 task
->task_flags
&= ~(TF_ACTIVE
| TF_REQUEST_STOP
);
1820 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1822 struct se_task
*task
, *task_tmp
;
1823 unsigned long flags
;
1826 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1827 cmd
->se_tfo
->get_task_tag(cmd
));
1830 * No tasks remain in the execution queue
1832 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1833 list_for_each_entry_safe(task
, task_tmp
,
1834 &cmd
->t_task_list
, t_list
) {
1835 pr_debug("Processing task %p\n", task
);
1837 * If the struct se_task has not been sent and is not active,
1838 * remove the struct se_task from the execution queue.
1840 if (!(task
->task_flags
& (TF_ACTIVE
| TF_SENT
))) {
1841 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1843 transport_remove_task_from_execute_queue(task
,
1846 pr_debug("Task %p removed from execute queue\n", task
);
1847 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1851 if (!target_stop_task(task
, &flags
)) {
1852 pr_debug("Task %p - did nothing\n", task
);
1856 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1862 * Handle SAM-esque emulation for generic transport request failures.
1864 static void transport_generic_request_failure(
1871 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1872 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1873 cmd
->t_task_cdb
[0]);
1874 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
1875 cmd
->se_tfo
->get_cmd_state(cmd
),
1877 cmd
->transport_error_status
);
1878 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1879 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1880 " t_transport_active: %d t_transport_stop: %d"
1881 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1882 atomic_read(&cmd
->t_task_cdbs_left
),
1883 atomic_read(&cmd
->t_task_cdbs_sent
),
1884 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1885 atomic_read(&cmd
->t_transport_active
),
1886 atomic_read(&cmd
->t_transport_stop
),
1887 atomic_read(&cmd
->t_transport_sent
));
1890 * For SAM Task Attribute emulation for failed struct se_cmd
1892 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1893 transport_complete_task_attr(cmd
);
1896 transport_direct_request_timeout(cmd
);
1897 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
1900 switch (cmd
->transport_error_status
) {
1901 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
1902 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1904 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
1905 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
1907 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
1908 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1910 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
1911 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
1913 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
1915 transport_new_cmd_failure(cmd
);
1917 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1918 * we force this session to fall back to session
1921 cmd
->se_tfo
->fall_back_to_erl0(cmd
->se_sess
);
1922 cmd
->se_tfo
->stop_session(cmd
->se_sess
, 0, 0);
1925 case PYX_TRANSPORT_LU_COMM_FAILURE
:
1926 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
1927 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1929 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
1930 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
1932 case PYX_TRANSPORT_WRITE_PROTECTED
:
1933 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
1935 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
1937 * No SENSE Data payload for this case, set SCSI Status
1938 * and queue the response to $FABRIC_MOD.
1940 * Uses linux/include/scsi/scsi.h SAM status codes defs
1942 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1944 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1945 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1948 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1951 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1952 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1953 cmd
->orig_fe_lun
, 0x2C,
1954 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1956 ret
= cmd
->se_tfo
->queue_status(cmd
);
1960 case PYX_TRANSPORT_USE_SENSE_REASON
:
1962 * struct se_cmd->scsi_sense_reason already set
1966 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1968 cmd
->transport_error_status
);
1969 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1973 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1974 * make the call to transport_send_check_condition_and_sense()
1975 * directly. Otherwise expect the fabric to make the call to
1976 * transport_send_check_condition_and_sense() after handling
1977 * possible unsoliticied write data payloads.
1979 if (!sc
&& !cmd
->se_tfo
->new_cmd_map
)
1980 transport_new_cmd_failure(cmd
);
1982 ret
= transport_send_check_condition_and_sense(cmd
,
1983 cmd
->scsi_sense_reason
, 0);
1989 transport_lun_remove_cmd(cmd
);
1990 if (!transport_cmd_check_stop_to_fabric(cmd
))
1995 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1996 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1999 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
2001 unsigned long flags
;
2003 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2004 if (!atomic_read(&cmd
->t_transport_timeout
)) {
2005 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2008 if (atomic_read(&cmd
->t_task_cdbs_timeout_left
)) {
2009 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2013 atomic_sub(atomic_read(&cmd
->t_transport_timeout
),
2015 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2018 static inline u32
transport_lba_21(unsigned char *cdb
)
2020 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2023 static inline u32
transport_lba_32(unsigned char *cdb
)
2025 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2028 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2030 unsigned int __v1
, __v2
;
2032 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2033 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2035 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2039 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2041 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2043 unsigned int __v1
, __v2
;
2045 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2046 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2048 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2051 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2053 unsigned long flags
;
2055 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2056 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2057 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2061 * Called from interrupt context.
2063 static void transport_task_timeout_handler(unsigned long data
)
2065 struct se_task
*task
= (struct se_task
*)data
;
2066 struct se_cmd
*cmd
= task
->task_se_cmd
;
2067 unsigned long flags
;
2069 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2071 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2074 * Determine if transport_complete_task() has already been called.
2076 if (!(task
->task_flags
& TF_ACTIVE
)) {
2077 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2079 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2083 atomic_inc(&cmd
->t_se_count
);
2084 atomic_inc(&cmd
->t_transport_timeout
);
2085 cmd
->t_tasks_failed
= 1;
2087 task
->task_flags
|= TF_TIMEOUT
;
2088 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2089 task
->task_scsi_status
= 1;
2091 if (task
->task_flags
& TF_REQUEST_STOP
) {
2092 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2093 " == 1\n", task
, cmd
);
2094 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2095 complete(&task
->task_stop_comp
);
2099 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
2100 pr_debug("transport task: %p cmd: %p timeout non zero"
2101 " t_task_cdbs_left\n", task
, cmd
);
2102 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2105 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2108 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
2109 cmd
->t_state
= TRANSPORT_COMPLETE
;
2110 atomic_set(&cmd
->t_transport_active
, 1);
2111 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2113 queue_work(target_completion_wq
, &cmd
->work
);
2116 static void transport_start_task_timer(struct se_task
*task
)
2118 struct se_device
*dev
= task
->task_se_cmd
->se_dev
;
2122 * If the task_timeout is disabled, exit now.
2124 timeout
= dev
->se_sub_dev
->se_dev_attrib
.task_timeout
;
2128 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2129 task
->task_timer
.data
= (unsigned long) task
;
2130 task
->task_timer
.function
= transport_task_timeout_handler
;
2131 add_timer(&task
->task_timer
);
2134 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2136 if (dev
->dev_tcq_window_closed
++ <
2137 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2138 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2140 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2142 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
2147 * Called from Fabric Module context from transport_execute_tasks()
2149 * The return of this function determins if the tasks from struct se_cmd
2150 * get added to the execution queue in transport_execute_tasks(),
2151 * or are added to the delayed or ordered lists here.
2153 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2155 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2158 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2159 * to allow the passed struct se_cmd list of tasks to the front of the list.
2161 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2162 atomic_inc(&cmd
->se_dev
->dev_hoq_count
);
2163 smp_mb__after_atomic_inc();
2164 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2165 " 0x%02x, se_ordered_id: %u\n",
2167 cmd
->se_ordered_id
);
2169 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2170 spin_lock(&cmd
->se_dev
->ordered_cmd_lock
);
2171 list_add_tail(&cmd
->se_ordered_node
,
2172 &cmd
->se_dev
->ordered_cmd_list
);
2173 spin_unlock(&cmd
->se_dev
->ordered_cmd_lock
);
2175 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2176 smp_mb__after_atomic_inc();
2178 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2179 " list, se_ordered_id: %u\n",
2181 cmd
->se_ordered_id
);
2183 * Add ORDERED command to tail of execution queue if
2184 * no other older commands exist that need to be
2187 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2191 * For SIMPLE and UNTAGGED Task Attribute commands
2193 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2194 smp_mb__after_atomic_inc();
2197 * Otherwise if one or more outstanding ORDERED task attribute exist,
2198 * add the dormant task(s) built for the passed struct se_cmd to the
2199 * execution queue and become in Active state for this struct se_device.
2201 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2203 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2204 * will be drained upon completion of HEAD_OF_QUEUE task.
2206 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2207 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2208 list_add_tail(&cmd
->se_delayed_node
,
2209 &cmd
->se_dev
->delayed_cmd_list
);
2210 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2212 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2213 " delayed CMD list, se_ordered_id: %u\n",
2214 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2215 cmd
->se_ordered_id
);
2217 * Return zero to let transport_execute_tasks() know
2218 * not to add the delayed tasks to the execution list.
2223 * Otherwise, no ORDERED task attributes exist..
2229 * Called from fabric module context in transport_generic_new_cmd() and
2230 * transport_generic_process_write()
2232 static int transport_execute_tasks(struct se_cmd
*cmd
)
2236 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2237 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2238 transport_generic_request_failure(cmd
, 0, 1);
2243 * Call transport_cmd_check_stop() to see if a fabric exception
2244 * has occurred that prevents execution.
2246 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2248 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2249 * attribute for the tasks of the received struct se_cmd CDB
2251 add_tasks
= transport_execute_task_attr(cmd
);
2255 * This calls transport_add_tasks_from_cmd() to handle
2256 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2257 * (if enabled) in __transport_add_task_to_execute_queue() and
2258 * transport_add_task_check_sam_attr().
2260 transport_add_tasks_from_cmd(cmd
);
2263 * Kick the execution queue for the cmd associated struct se_device
2267 __transport_execute_tasks(cmd
->se_dev
);
2272 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2273 * from struct se_device->execute_task_list and
2275 * Called from transport_processing_thread()
2277 static int __transport_execute_tasks(struct se_device
*dev
)
2280 struct se_cmd
*cmd
= NULL
;
2281 struct se_task
*task
= NULL
;
2282 unsigned long flags
;
2285 * Check if there is enough room in the device and HBA queue to send
2286 * struct se_tasks to the selected transport.
2289 if (!atomic_read(&dev
->depth_left
))
2290 return transport_tcq_window_closed(dev
);
2292 dev
->dev_tcq_window_closed
= 0;
2294 spin_lock_irq(&dev
->execute_task_lock
);
2295 if (list_empty(&dev
->execute_task_list
)) {
2296 spin_unlock_irq(&dev
->execute_task_lock
);
2299 task
= list_first_entry(&dev
->execute_task_list
,
2300 struct se_task
, t_execute_list
);
2301 __transport_remove_task_from_execute_queue(task
, dev
);
2302 spin_unlock_irq(&dev
->execute_task_lock
);
2304 atomic_dec(&dev
->depth_left
);
2306 cmd
= task
->task_se_cmd
;
2308 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2309 task
->task_flags
|= (TF_ACTIVE
| TF_SENT
);
2310 atomic_inc(&cmd
->t_task_cdbs_sent
);
2312 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2313 cmd
->t_task_list_num
)
2314 atomic_set(&cmd
->transport_sent
, 1);
2316 transport_start_task_timer(task
);
2317 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2319 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2320 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2321 * struct se_subsystem_api->do_task() caller below.
2323 if (cmd
->transport_emulate_cdb
) {
2324 error
= cmd
->transport_emulate_cdb(cmd
);
2326 cmd
->transport_error_status
= error
;
2327 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2328 task
->task_flags
&= ~TF_ACTIVE
;
2329 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2330 del_timer_sync(&task
->task_timer
);
2331 atomic_set(&cmd
->transport_sent
, 0);
2332 transport_stop_tasks_for_cmd(cmd
);
2333 atomic_inc(&dev
->depth_left
);
2334 transport_generic_request_failure(cmd
, 0, 1);
2338 * Handle the successful completion for transport_emulate_cdb()
2339 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2340 * Otherwise the caller is expected to complete the task with
2343 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2344 cmd
->scsi_status
= SAM_STAT_GOOD
;
2345 task
->task_scsi_status
= GOOD
;
2346 transport_complete_task(task
, 1);
2350 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2351 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2352 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2353 * LUN emulation code.
2355 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2356 * call ->do_task() directly and let the underlying TCM subsystem plugin
2357 * code handle the CDB emulation.
2359 if ((dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2360 (!(task
->task_se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2361 error
= transport_emulate_control_cdb(task
);
2363 error
= dev
->transport
->do_task(task
);
2366 cmd
->transport_error_status
= error
;
2367 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2368 task
->task_flags
&= ~TF_ACTIVE
;
2369 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2370 del_timer_sync(&task
->task_timer
);
2371 atomic_set(&cmd
->transport_sent
, 0);
2372 transport_stop_tasks_for_cmd(cmd
);
2373 atomic_inc(&dev
->depth_left
);
2374 transport_generic_request_failure(cmd
, 0, 1);
2383 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2385 unsigned long flags
;
2387 * Any unsolicited data will get dumped for failed command inside of
2390 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2391 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2392 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2393 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2396 static inline u32
transport_get_sectors_6(
2401 struct se_device
*dev
= cmd
->se_dev
;
2404 * Assume TYPE_DISK for non struct se_device objects.
2405 * Use 8-bit sector value.
2411 * Use 24-bit allocation length for TYPE_TAPE.
2413 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2414 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2417 * Everything else assume TYPE_DISK Sector CDB location.
2418 * Use 8-bit sector value.
2424 static inline u32
transport_get_sectors_10(
2429 struct se_device
*dev
= cmd
->se_dev
;
2432 * Assume TYPE_DISK for non struct se_device objects.
2433 * Use 16-bit sector value.
2439 * XXX_10 is not defined in SSC, throw an exception
2441 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2447 * Everything else assume TYPE_DISK Sector CDB location.
2448 * Use 16-bit sector value.
2451 return (u32
)(cdb
[7] << 8) + cdb
[8];
2454 static inline u32
transport_get_sectors_12(
2459 struct se_device
*dev
= cmd
->se_dev
;
2462 * Assume TYPE_DISK for non struct se_device objects.
2463 * Use 32-bit sector value.
2469 * XXX_12 is not defined in SSC, throw an exception
2471 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2477 * Everything else assume TYPE_DISK Sector CDB location.
2478 * Use 32-bit sector value.
2481 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2484 static inline u32
transport_get_sectors_16(
2489 struct se_device
*dev
= cmd
->se_dev
;
2492 * Assume TYPE_DISK for non struct se_device objects.
2493 * Use 32-bit sector value.
2499 * Use 24-bit allocation length for TYPE_TAPE.
2501 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2502 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2505 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2506 (cdb
[12] << 8) + cdb
[13];
2510 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2512 static inline u32
transport_get_sectors_32(
2518 * Assume TYPE_DISK for non struct se_device objects.
2519 * Use 32-bit sector value.
2521 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2522 (cdb
[30] << 8) + cdb
[31];
2526 static inline u32
transport_get_size(
2531 struct se_device
*dev
= cmd
->se_dev
;
2533 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2534 if (cdb
[1] & 1) { /* sectors */
2535 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2540 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2541 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2542 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2543 dev
->transport
->name
);
2545 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2548 static void transport_xor_callback(struct se_cmd
*cmd
)
2550 unsigned char *buf
, *addr
;
2551 struct scatterlist
*sg
;
2552 unsigned int offset
;
2556 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2558 * 1) read the specified logical block(s);
2559 * 2) transfer logical blocks from the data-out buffer;
2560 * 3) XOR the logical blocks transferred from the data-out buffer with
2561 * the logical blocks read, storing the resulting XOR data in a buffer;
2562 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2563 * blocks transferred from the data-out buffer; and
2564 * 5) transfer the resulting XOR data to the data-in buffer.
2566 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2568 pr_err("Unable to allocate xor_callback buf\n");
2572 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2573 * into the locally allocated *buf
2575 sg_copy_to_buffer(cmd
->t_data_sg
,
2581 * Now perform the XOR against the BIDI read memory located at
2582 * cmd->t_mem_bidi_list
2586 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2587 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2591 for (i
= 0; i
< sg
->length
; i
++)
2592 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2594 offset
+= sg
->length
;
2595 kunmap_atomic(addr
, KM_USER0
);
2603 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2605 static int transport_get_sense_data(struct se_cmd
*cmd
)
2607 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2608 struct se_device
*dev
= cmd
->se_dev
;
2609 struct se_task
*task
= NULL
, *task_tmp
;
2610 unsigned long flags
;
2613 WARN_ON(!cmd
->se_lun
);
2618 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2619 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2620 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2624 list_for_each_entry_safe(task
, task_tmp
,
2625 &cmd
->t_task_list
, t_list
) {
2626 if (!task
->task_sense
)
2629 if (!dev
->transport
->get_sense_buffer
) {
2630 pr_err("dev->transport->get_sense_buffer"
2635 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2636 if (!sense_buffer
) {
2637 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2638 " sense buffer for task with sense\n",
2639 cmd
->se_tfo
->get_task_tag(cmd
), task
);
2642 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2644 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2645 TRANSPORT_SENSE_BUFFER
);
2647 memcpy(&buffer
[offset
], sense_buffer
,
2648 TRANSPORT_SENSE_BUFFER
);
2649 cmd
->scsi_status
= task
->task_scsi_status
;
2650 /* Automatically padded */
2651 cmd
->scsi_sense_length
=
2652 (TRANSPORT_SENSE_BUFFER
+ offset
);
2654 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2656 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2660 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2666 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
2668 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2669 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2670 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2672 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2673 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2676 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2679 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2680 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2681 cmd
->orig_fe_lun
, 0x2C,
2682 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2686 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2688 return dev
->transport
->get_blocks(dev
) + 1;
2691 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2693 struct se_device
*dev
= cmd
->se_dev
;
2696 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2699 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2701 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2702 pr_err("LBA: %llu Sectors: %u exceeds"
2703 " transport_dev_end_lba(): %llu\n",
2704 cmd
->t_task_lba
, sectors
,
2705 transport_dev_end_lba(dev
));
2712 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2715 * Determine if the received WRITE_SAME is used to for direct
2716 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2717 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2718 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2720 int passthrough
= (dev
->transport
->transport_type
==
2721 TRANSPORT_PLUGIN_PHBA_PDEV
);
2724 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2725 pr_err("WRITE_SAME PBDATA and LBDATA"
2726 " bits not supported for Block Discard"
2731 * Currently for the emulated case we only accept
2732 * tpws with the UNMAP=1 bit set.
2734 if (!(flags
[0] & 0x08)) {
2735 pr_err("WRITE_SAME w/o UNMAP bit not"
2736 " supported for Block Discard Emulation\n");
2744 /* transport_generic_cmd_sequencer():
2746 * Generic Command Sequencer that should work for most DAS transport
2749 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2752 * FIXME: Need to support other SCSI OPCODES where as well.
2754 static int transport_generic_cmd_sequencer(
2758 struct se_device
*dev
= cmd
->se_dev
;
2759 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2760 int ret
= 0, sector_ret
= 0, passthrough
;
2761 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2765 * Check for an existing UNIT ATTENTION condition
2767 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2768 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2769 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2773 * Check status of Asymmetric Logical Unit Assignment port
2775 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2778 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2779 * The ALUA additional sense code qualifier (ASCQ) is determined
2780 * by the ALUA primary or secondary access state..
2784 pr_debug("[%s]: ALUA TG Port not available,"
2785 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2786 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2788 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2789 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2790 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2793 goto out_invalid_cdb_field
;
2796 * Check status for SPC-3 Persistent Reservations
2798 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2799 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2800 cmd
, cdb
, pr_reg_type
) != 0)
2801 return transport_handle_reservation_conflict(cmd
);
2803 * This means the CDB is allowed for the SCSI Initiator port
2804 * when said port is *NOT* holding the legacy SPC-2 or
2805 * SPC-3 Persistent Reservation.
2811 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2813 goto out_unsupported_cdb
;
2814 size
= transport_get_size(sectors
, cdb
, cmd
);
2815 cmd
->t_task_lba
= transport_lba_21(cdb
);
2816 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2819 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2821 goto out_unsupported_cdb
;
2822 size
= transport_get_size(sectors
, cdb
, cmd
);
2823 cmd
->t_task_lba
= transport_lba_32(cdb
);
2824 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2827 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2829 goto out_unsupported_cdb
;
2830 size
= transport_get_size(sectors
, cdb
, cmd
);
2831 cmd
->t_task_lba
= transport_lba_32(cdb
);
2832 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2835 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2837 goto out_unsupported_cdb
;
2838 size
= transport_get_size(sectors
, cdb
, cmd
);
2839 cmd
->t_task_lba
= transport_lba_64(cdb
);
2840 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2843 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2845 goto out_unsupported_cdb
;
2846 size
= transport_get_size(sectors
, cdb
, cmd
);
2847 cmd
->t_task_lba
= transport_lba_21(cdb
);
2848 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2851 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2853 goto out_unsupported_cdb
;
2854 size
= transport_get_size(sectors
, cdb
, cmd
);
2855 cmd
->t_task_lba
= transport_lba_32(cdb
);
2856 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2857 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2860 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2862 goto out_unsupported_cdb
;
2863 size
= transport_get_size(sectors
, cdb
, cmd
);
2864 cmd
->t_task_lba
= transport_lba_32(cdb
);
2865 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2866 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2869 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2871 goto out_unsupported_cdb
;
2872 size
= transport_get_size(sectors
, cdb
, cmd
);
2873 cmd
->t_task_lba
= transport_lba_64(cdb
);
2874 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2875 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2877 case XDWRITEREAD_10
:
2878 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2879 !(cmd
->t_tasks_bidi
))
2880 goto out_invalid_cdb_field
;
2881 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2883 goto out_unsupported_cdb
;
2884 size
= transport_get_size(sectors
, cdb
, cmd
);
2885 cmd
->t_task_lba
= transport_lba_32(cdb
);
2886 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2887 passthrough
= (dev
->transport
->transport_type
==
2888 TRANSPORT_PLUGIN_PHBA_PDEV
);
2890 * Skip the remaining assignments for TCM/PSCSI passthrough
2895 * Setup BIDI XOR callback to be run after I/O completion.
2897 cmd
->transport_complete_callback
= &transport_xor_callback
;
2898 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2900 case VARIABLE_LENGTH_CMD
:
2901 service_action
= get_unaligned_be16(&cdb
[8]);
2903 * Determine if this is TCM/PSCSI device and we should disable
2904 * internal emulation for this CDB.
2906 passthrough
= (dev
->transport
->transport_type
==
2907 TRANSPORT_PLUGIN_PHBA_PDEV
);
2909 switch (service_action
) {
2910 case XDWRITEREAD_32
:
2911 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2913 goto out_unsupported_cdb
;
2914 size
= transport_get_size(sectors
, cdb
, cmd
);
2916 * Use WRITE_32 and READ_32 opcodes for the emulated
2917 * XDWRITE_READ_32 logic.
2919 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2920 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2923 * Skip the remaining assignments for TCM/PSCSI passthrough
2929 * Setup BIDI XOR callback to be run during after I/O
2932 cmd
->transport_complete_callback
= &transport_xor_callback
;
2933 cmd
->t_tasks_fua
= (cdb
[10] & 0x8);
2936 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2938 goto out_unsupported_cdb
;
2941 size
= transport_get_size(1, cdb
, cmd
);
2943 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2945 goto out_invalid_cdb_field
;
2948 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2949 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2951 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2952 goto out_invalid_cdb_field
;
2956 pr_err("VARIABLE_LENGTH_CMD service action"
2957 " 0x%04x not supported\n", service_action
);
2958 goto out_unsupported_cdb
;
2961 case MAINTENANCE_IN
:
2962 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2963 /* MAINTENANCE_IN from SCC-2 */
2965 * Check for emulated MI_REPORT_TARGET_PGS.
2967 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
2968 cmd
->transport_emulate_cdb
=
2969 (su_dev
->t10_alua
.alua_type
==
2970 SPC3_ALUA_EMULATED
) ?
2971 core_emulate_report_target_port_groups
:
2974 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2975 (cdb
[8] << 8) | cdb
[9];
2977 /* GPCMD_SEND_KEY from multi media commands */
2978 size
= (cdb
[8] << 8) + cdb
[9];
2980 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2984 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2986 case MODE_SELECT_10
:
2987 size
= (cdb
[7] << 8) + cdb
[8];
2988 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2992 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2995 case GPCMD_READ_BUFFER_CAPACITY
:
2996 case GPCMD_SEND_OPC
:
2999 size
= (cdb
[7] << 8) + cdb
[8];
3000 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3002 case READ_BLOCK_LIMITS
:
3003 size
= READ_BLOCK_LEN
;
3004 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3006 case GPCMD_GET_CONFIGURATION
:
3007 case GPCMD_READ_FORMAT_CAPACITIES
:
3008 case GPCMD_READ_DISC_INFO
:
3009 case GPCMD_READ_TRACK_RZONE_INFO
:
3010 size
= (cdb
[7] << 8) + cdb
[8];
3011 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3013 case PERSISTENT_RESERVE_IN
:
3014 case PERSISTENT_RESERVE_OUT
:
3015 cmd
->transport_emulate_cdb
=
3016 (su_dev
->t10_pr
.res_type
==
3017 SPC3_PERSISTENT_RESERVATIONS
) ?
3018 core_scsi3_emulate_pr
: NULL
;
3019 size
= (cdb
[7] << 8) + cdb
[8];
3020 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3022 case GPCMD_MECHANISM_STATUS
:
3023 case GPCMD_READ_DVD_STRUCTURE
:
3024 size
= (cdb
[8] << 8) + cdb
[9];
3025 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3028 size
= READ_POSITION_LEN
;
3029 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3031 case MAINTENANCE_OUT
:
3032 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3033 /* MAINTENANCE_OUT from SCC-2
3035 * Check for emulated MO_SET_TARGET_PGS.
3037 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3038 cmd
->transport_emulate_cdb
=
3039 (su_dev
->t10_alua
.alua_type
==
3040 SPC3_ALUA_EMULATED
) ?
3041 core_emulate_set_target_port_groups
:
3045 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3046 (cdb
[8] << 8) | cdb
[9];
3048 /* GPCMD_REPORT_KEY from multi media commands */
3049 size
= (cdb
[8] << 8) + cdb
[9];
3051 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3054 size
= (cdb
[3] << 8) + cdb
[4];
3056 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3057 * See spc4r17 section 5.3
3059 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3060 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3061 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3064 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3065 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3068 size
= READ_CAP_LEN
;
3069 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3071 case READ_MEDIA_SERIAL_NUMBER
:
3072 case SECURITY_PROTOCOL_IN
:
3073 case SECURITY_PROTOCOL_OUT
:
3074 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3075 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3077 case SERVICE_ACTION_IN
:
3078 case ACCESS_CONTROL_IN
:
3079 case ACCESS_CONTROL_OUT
:
3081 case READ_ATTRIBUTE
:
3082 case RECEIVE_COPY_RESULTS
:
3083 case WRITE_ATTRIBUTE
:
3084 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3085 (cdb
[12] << 8) | cdb
[13];
3086 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3088 case RECEIVE_DIAGNOSTIC
:
3089 case SEND_DIAGNOSTIC
:
3090 size
= (cdb
[3] << 8) | cdb
[4];
3091 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3093 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3096 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3097 size
= (2336 * sectors
);
3098 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3103 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3107 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3109 case READ_ELEMENT_STATUS
:
3110 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3111 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3114 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3115 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3120 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3121 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3123 if (cdb
[0] == RESERVE_10
)
3124 size
= (cdb
[7] << 8) | cdb
[8];
3126 size
= cmd
->data_length
;
3129 * Setup the legacy emulated handler for SPC-2 and
3130 * >= SPC-3 compatible reservation handling (CRH=1)
3131 * Otherwise, we assume the underlying SCSI logic is
3132 * is running in SPC_PASSTHROUGH, and wants reservations
3133 * emulation disabled.
3135 cmd
->transport_emulate_cdb
=
3136 (su_dev
->t10_pr
.res_type
!=
3138 core_scsi2_emulate_crh
: NULL
;
3139 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3144 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3145 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3147 if (cdb
[0] == RELEASE_10
)
3148 size
= (cdb
[7] << 8) | cdb
[8];
3150 size
= cmd
->data_length
;
3152 cmd
->transport_emulate_cdb
=
3153 (su_dev
->t10_pr
.res_type
!=
3155 core_scsi2_emulate_crh
: NULL
;
3156 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3158 case SYNCHRONIZE_CACHE
:
3159 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3161 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3163 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3164 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3165 cmd
->t_task_lba
= transport_lba_32(cdb
);
3167 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3168 cmd
->t_task_lba
= transport_lba_64(cdb
);
3171 goto out_unsupported_cdb
;
3173 size
= transport_get_size(sectors
, cdb
, cmd
);
3174 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3177 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3179 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3182 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3183 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3185 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3187 * Check to ensure that LBA + Range does not exceed past end of
3188 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3190 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
3191 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3192 goto out_invalid_cdb_field
;
3196 size
= get_unaligned_be16(&cdb
[7]);
3197 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3200 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3202 goto out_unsupported_cdb
;
3205 size
= transport_get_size(1, cdb
, cmd
);
3207 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3208 goto out_invalid_cdb_field
;
3211 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
3212 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3214 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3215 goto out_invalid_cdb_field
;
3218 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3220 goto out_unsupported_cdb
;
3223 size
= transport_get_size(1, cdb
, cmd
);
3225 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3226 goto out_invalid_cdb_field
;
3229 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3230 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3232 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3233 * of byte 1 bit 3 UNMAP instead of original reserved field
3235 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3236 goto out_invalid_cdb_field
;
3238 case ALLOW_MEDIUM_REMOVAL
:
3239 case GPCMD_CLOSE_TRACK
:
3241 case INITIALIZE_ELEMENT_STATUS
:
3242 case GPCMD_LOAD_UNLOAD
:
3245 case GPCMD_SET_SPEED
:
3248 case TEST_UNIT_READY
:
3250 case WRITE_FILEMARKS
:
3252 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3255 cmd
->transport_emulate_cdb
=
3256 transport_core_report_lun_response
;
3257 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3259 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3260 * See spc4r17 section 5.3
3262 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3263 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3264 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3267 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3268 " 0x%02x, sending CHECK_CONDITION.\n",
3269 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3270 goto out_unsupported_cdb
;
3273 if (size
!= cmd
->data_length
) {
3274 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3275 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3276 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3277 cmd
->data_length
, size
, cdb
[0]);
3279 cmd
->cmd_spdtl
= size
;
3281 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3282 pr_err("Rejecting underflow/overflow"
3284 goto out_invalid_cdb_field
;
3287 * Reject READ_* or WRITE_* with overflow/underflow for
3288 * type SCF_SCSI_DATA_SG_IO_CDB.
3290 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3291 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3292 " CDB on non 512-byte sector setup subsystem"
3293 " plugin: %s\n", dev
->transport
->name
);
3294 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3295 goto out_invalid_cdb_field
;
3298 if (size
> cmd
->data_length
) {
3299 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3300 cmd
->residual_count
= (size
- cmd
->data_length
);
3302 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3303 cmd
->residual_count
= (cmd
->data_length
- size
);
3305 cmd
->data_length
= size
;
3308 /* Let's limit control cdbs to a page, for simplicity's sake. */
3309 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3311 goto out_invalid_cdb_field
;
3313 transport_set_supported_SAM_opcode(cmd
);
3316 out_unsupported_cdb
:
3317 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3318 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3320 out_invalid_cdb_field
:
3321 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3322 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3327 * Called from I/O completion to determine which dormant/delayed
3328 * and ordered cmds need to have their tasks added to the execution queue.
3330 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3332 struct se_device
*dev
= cmd
->se_dev
;
3333 struct se_cmd
*cmd_p
, *cmd_tmp
;
3334 int new_active_tasks
= 0;
3336 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3337 atomic_dec(&dev
->simple_cmds
);
3338 smp_mb__after_atomic_dec();
3339 dev
->dev_cur_ordered_id
++;
3340 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3341 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3342 cmd
->se_ordered_id
);
3343 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3344 atomic_dec(&dev
->dev_hoq_count
);
3345 smp_mb__after_atomic_dec();
3346 dev
->dev_cur_ordered_id
++;
3347 pr_debug("Incremented dev_cur_ordered_id: %u for"
3348 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3349 cmd
->se_ordered_id
);
3350 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3351 spin_lock(&dev
->ordered_cmd_lock
);
3352 list_del(&cmd
->se_ordered_node
);
3353 atomic_dec(&dev
->dev_ordered_sync
);
3354 smp_mb__after_atomic_dec();
3355 spin_unlock(&dev
->ordered_cmd_lock
);
3357 dev
->dev_cur_ordered_id
++;
3358 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3359 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3362 * Process all commands up to the last received
3363 * ORDERED task attribute which requires another blocking
3366 spin_lock(&dev
->delayed_cmd_lock
);
3367 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3368 &dev
->delayed_cmd_list
, se_delayed_node
) {
3370 list_del(&cmd_p
->se_delayed_node
);
3371 spin_unlock(&dev
->delayed_cmd_lock
);
3373 pr_debug("Calling add_tasks() for"
3374 " cmd_p: 0x%02x Task Attr: 0x%02x"
3375 " Dormant -> Active, se_ordered_id: %u\n",
3376 cmd_p
->t_task_cdb
[0],
3377 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3379 transport_add_tasks_from_cmd(cmd_p
);
3382 spin_lock(&dev
->delayed_cmd_lock
);
3383 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3386 spin_unlock(&dev
->delayed_cmd_lock
);
3388 * If new tasks have become active, wake up the transport thread
3389 * to do the processing of the Active tasks.
3391 if (new_active_tasks
!= 0)
3392 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3395 static void transport_complete_qf(struct se_cmd
*cmd
)
3399 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3400 transport_complete_task_attr(cmd
);
3402 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3403 ret
= cmd
->se_tfo
->queue_status(cmd
);
3408 switch (cmd
->data_direction
) {
3409 case DMA_FROM_DEVICE
:
3410 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3413 if (cmd
->t_bidi_data_sg
) {
3414 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3418 /* Fall through for DMA_TO_DEVICE */
3420 ret
= cmd
->se_tfo
->queue_status(cmd
);
3428 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3431 transport_lun_remove_cmd(cmd
);
3432 transport_cmd_check_stop_to_fabric(cmd
);
3435 static void transport_handle_queue_full(
3437 struct se_device
*dev
)
3439 spin_lock_irq(&dev
->qf_cmd_lock
);
3440 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3441 atomic_inc(&dev
->dev_qf_count
);
3442 smp_mb__after_atomic_inc();
3443 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3445 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3448 static void target_complete_ok_work(struct work_struct
*work
)
3450 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3451 int reason
= 0, ret
;
3454 * Check if we need to move delayed/dormant tasks from cmds on the
3455 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3458 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3459 transport_complete_task_attr(cmd
);
3461 * Check to schedule QUEUE_FULL work, or execute an existing
3462 * cmd->transport_qf_callback()
3464 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3465 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3468 * Check if we need to retrieve a sense buffer from
3469 * the struct se_cmd in question.
3471 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3472 if (transport_get_sense_data(cmd
) < 0)
3473 reason
= TCM_NON_EXISTENT_LUN
;
3476 * Only set when an struct se_task->task_scsi_status returned
3477 * a non GOOD status.
3479 if (cmd
->scsi_status
) {
3480 ret
= transport_send_check_condition_and_sense(
3485 transport_lun_remove_cmd(cmd
);
3486 transport_cmd_check_stop_to_fabric(cmd
);
3491 * Check for a callback, used by amongst other things
3492 * XDWRITE_READ_10 emulation.
3494 if (cmd
->transport_complete_callback
)
3495 cmd
->transport_complete_callback(cmd
);
3497 switch (cmd
->data_direction
) {
3498 case DMA_FROM_DEVICE
:
3499 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3500 if (cmd
->se_lun
->lun_sep
) {
3501 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3504 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3506 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3511 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3512 if (cmd
->se_lun
->lun_sep
) {
3513 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3516 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3518 * Check if we need to send READ payload for BIDI-COMMAND
3520 if (cmd
->t_bidi_data_sg
) {
3521 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3522 if (cmd
->se_lun
->lun_sep
) {
3523 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3526 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3527 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3532 /* Fall through for DMA_TO_DEVICE */
3534 ret
= cmd
->se_tfo
->queue_status(cmd
);
3542 transport_lun_remove_cmd(cmd
);
3543 transport_cmd_check_stop_to_fabric(cmd
);
3547 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3548 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3549 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3550 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3553 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3555 struct se_task
*task
, *task_tmp
;
3556 unsigned long flags
;
3557 LIST_HEAD(dispose_list
);
3559 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3560 list_for_each_entry_safe(task
, task_tmp
,
3561 &cmd
->t_task_list
, t_list
) {
3562 if (!(task
->task_flags
& TF_ACTIVE
))
3563 list_move_tail(&task
->t_list
, &dispose_list
);
3565 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3567 while (!list_empty(&dispose_list
)) {
3568 task
= list_first_entry(&dispose_list
, struct se_task
, t_list
);
3571 * We already cancelled all pending timers in
3572 * transport_complete_task, but that was just a pure del_timer,
3573 * so do a full del_timer_sync here to make sure any handler
3574 * that was running at that point has finished execution.
3576 del_timer_sync(&task
->task_timer
);
3578 kfree(task
->task_sg_bidi
);
3579 kfree(task
->task_sg
);
3581 list_del(&task
->t_list
);
3583 cmd
->se_dev
->transport
->free_task(task
);
3587 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3589 struct scatterlist
*sg
;
3592 for_each_sg(sgl
, sg
, nents
, count
)
3593 __free_page(sg_page(sg
));
3598 static inline void transport_free_pages(struct se_cmd
*cmd
)
3600 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3603 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3604 cmd
->t_data_sg
= NULL
;
3605 cmd
->t_data_nents
= 0;
3607 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3608 cmd
->t_bidi_data_sg
= NULL
;
3609 cmd
->t_bidi_data_nents
= 0;
3613 * transport_put_cmd - release a reference to a command
3614 * @cmd: command to release
3616 * This routine releases our reference to the command and frees it if possible.
3618 static void transport_put_cmd(struct se_cmd
*cmd
)
3620 unsigned long flags
;
3623 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3624 if (atomic_read(&cmd
->t_fe_count
)) {
3625 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3629 if (atomic_read(&cmd
->t_se_count
)) {
3630 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3634 if (atomic_read(&cmd
->transport_dev_active
)) {
3635 atomic_set(&cmd
->transport_dev_active
, 0);
3636 transport_all_task_dev_remove_state(cmd
);
3639 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3641 if (free_tasks
!= 0)
3642 transport_free_dev_tasks(cmd
);
3644 transport_free_pages(cmd
);
3645 transport_release_cmd(cmd
);
3648 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3652 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3653 * allocating in the core.
3654 * @cmd: Associated se_cmd descriptor
3655 * @mem: SGL style memory for TCM WRITE / READ
3656 * @sg_mem_num: Number of SGL elements
3657 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3658 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3660 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3663 int transport_generic_map_mem_to_cmd(
3665 struct scatterlist
*sgl
,
3667 struct scatterlist
*sgl_bidi
,
3670 if (!sgl
|| !sgl_count
)
3673 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3674 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3676 cmd
->t_data_sg
= sgl
;
3677 cmd
->t_data_nents
= sgl_count
;
3679 if (sgl_bidi
&& sgl_bidi_count
) {
3680 cmd
->t_bidi_data_sg
= sgl_bidi
;
3681 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3683 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3688 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3690 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
3692 struct se_device
*dev
= cmd
->se_dev
;
3693 int set_counts
= 1, rc
, task_cdbs
;
3696 * Setup any BIDI READ tasks and memory from
3697 * cmd->t_mem_bidi_list so the READ struct se_tasks
3698 * are queued first for the non pSCSI passthrough case.
3700 if (cmd
->t_bidi_data_sg
&&
3701 (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
3702 rc
= transport_allocate_tasks(cmd
,
3705 cmd
->t_bidi_data_sg
,
3706 cmd
->t_bidi_data_nents
);
3708 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3709 cmd
->scsi_sense_reason
=
3710 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3713 atomic_inc(&cmd
->t_fe_count
);
3714 atomic_inc(&cmd
->t_se_count
);
3718 * Setup the tasks and memory from cmd->t_mem_list
3719 * Note for BIDI transfers this will contain the WRITE payload
3721 task_cdbs
= transport_allocate_tasks(cmd
,
3723 cmd
->data_direction
,
3726 if (task_cdbs
<= 0) {
3727 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3728 cmd
->scsi_sense_reason
=
3729 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3734 atomic_inc(&cmd
->t_fe_count
);
3735 atomic_inc(&cmd
->t_se_count
);
3738 cmd
->t_task_list_num
= task_cdbs
;
3740 atomic_set(&cmd
->t_task_cdbs_left
, task_cdbs
);
3741 atomic_set(&cmd
->t_task_cdbs_ex_left
, task_cdbs
);
3742 atomic_set(&cmd
->t_task_cdbs_timeout_left
, task_cdbs
);
3746 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3748 struct scatterlist
*sg
= cmd
->t_data_sg
;
3752 * We need to take into account a possible offset here for fabrics like
3753 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3754 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3756 return kmap(sg_page(sg
)) + sg
->offset
;
3758 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3760 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3762 kunmap(sg_page(cmd
->t_data_sg
));
3764 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3767 transport_generic_get_mem(struct se_cmd
*cmd
)
3769 u32 length
= cmd
->data_length
;
3774 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3775 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3776 if (!cmd
->t_data_sg
)
3779 cmd
->t_data_nents
= nents
;
3780 sg_init_table(cmd
->t_data_sg
, nents
);
3783 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3784 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3788 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3796 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3799 kfree(cmd
->t_data_sg
);
3800 cmd
->t_data_sg
= NULL
;
3804 /* Reduce sectors if they are too long for the device */
3805 static inline sector_t
transport_limit_task_sectors(
3806 struct se_device
*dev
,
3807 unsigned long long lba
,
3810 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3812 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3813 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3814 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3821 * This function can be used by HW target mode drivers to create a linked
3822 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3823 * This is intended to be called during the completion path by TCM Core
3824 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3826 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3828 struct scatterlist
*sg_first
= NULL
;
3829 struct scatterlist
*sg_prev
= NULL
;
3830 int sg_prev_nents
= 0;
3831 struct scatterlist
*sg
;
3832 struct se_task
*task
;
3833 u32 chained_nents
= 0;
3836 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3839 * Walk the struct se_task list and setup scatterlist chains
3840 * for each contiguously allocated struct se_task->task_sg[].
3842 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3847 sg_first
= task
->task_sg
;
3848 chained_nents
= task
->task_sg_nents
;
3850 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3851 chained_nents
+= task
->task_sg_nents
;
3854 * For the padded tasks, use the extra SGL vector allocated
3855 * in transport_allocate_data_tasks() for the sg_prev_nents
3856 * offset into sg_chain() above.
3858 * We do not need the padding for the last task (or a single
3859 * task), but in that case we will never use the sg_prev_nents
3860 * value below which would be incorrect.
3862 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3863 sg_prev
= task
->task_sg
;
3866 * Setup the starting pointer and total t_tasks_sg_linked_no including
3867 * padding SGs for linking and to mark the end.
3869 cmd
->t_tasks_sg_chained
= sg_first
;
3870 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3872 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3873 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3874 cmd
->t_tasks_sg_chained_no
);
3876 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
3877 cmd
->t_tasks_sg_chained_no
, i
) {
3879 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3880 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
3881 if (sg_is_chain(sg
))
3882 pr_debug("SG: %p sg_is_chain=1\n", sg
);
3884 pr_debug("SG: %p sg_is_last=1\n", sg
);
3887 EXPORT_SYMBOL(transport_do_task_sg_chain
);
3890 * Break up cmd into chunks transport can handle
3892 static int transport_allocate_data_tasks(
3894 unsigned long long lba
,
3895 enum dma_data_direction data_direction
,
3896 struct scatterlist
*sgl
,
3897 unsigned int sgl_nents
)
3899 struct se_task
*task
;
3900 struct se_device
*dev
= cmd
->se_dev
;
3901 unsigned long flags
;
3903 sector_t sectors
, dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
3904 u32 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
3905 struct scatterlist
*sg
;
3906 struct scatterlist
*cmd_sg
;
3908 WARN_ON(cmd
->data_length
% sector_size
);
3909 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
3910 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
3913 for (i
= 0; i
< task_count
; i
++) {
3914 unsigned int task_size
, task_sg_nents_padded
;
3917 task
= transport_generic_get_task(cmd
, data_direction
);
3921 task
->task_lba
= lba
;
3922 task
->task_sectors
= min(sectors
, dev_max_sectors
);
3923 task
->task_size
= task
->task_sectors
* sector_size
;
3926 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3927 * in order to calculate the number per task SGL entries
3929 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
3931 * Check if the fabric module driver is requesting that all
3932 * struct se_task->task_sg[] be chained together.. If so,
3933 * then allocate an extra padding SG entry for linking and
3934 * marking the end of the chained SGL for every task except
3935 * the last one for (task_count > 1) operation, or skipping
3936 * the extra padding for the (task_count == 1) case.
3938 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
3939 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
3941 task_sg_nents_padded
= task
->task_sg_nents
;
3943 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
3944 task_sg_nents_padded
, GFP_KERNEL
);
3945 if (!task
->task_sg
) {
3946 cmd
->se_dev
->transport
->free_task(task
);
3950 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
3952 task_size
= task
->task_size
;
3954 /* Build new sgl, only up to task_size */
3955 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
3956 if (cmd_sg
->length
> task_size
)
3960 task_size
-= cmd_sg
->length
;
3961 cmd_sg
= sg_next(cmd_sg
);
3964 lba
+= task
->task_sectors
;
3965 sectors
-= task
->task_sectors
;
3967 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3968 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3969 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3976 transport_allocate_control_task(struct se_cmd
*cmd
)
3978 struct se_task
*task
;
3979 unsigned long flags
;
3981 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
3985 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
3987 if (!task
->task_sg
) {
3988 cmd
->se_dev
->transport
->free_task(task
);
3992 memcpy(task
->task_sg
, cmd
->t_data_sg
,
3993 sizeof(struct scatterlist
) * cmd
->t_data_nents
);
3994 task
->task_size
= cmd
->data_length
;
3995 task
->task_sg_nents
= cmd
->t_data_nents
;
3997 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3998 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3999 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4001 /* Success! Return number of tasks allocated */
4005 static u32
transport_allocate_tasks(
4007 unsigned long long lba
,
4008 enum dma_data_direction data_direction
,
4009 struct scatterlist
*sgl
,
4010 unsigned int sgl_nents
)
4012 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
4013 if (transport_cmd_get_valid_sectors(cmd
) < 0)
4016 return transport_allocate_data_tasks(cmd
, lba
, data_direction
,
4019 return transport_allocate_control_task(cmd
);
4024 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4026 * Allocate storage transport resources from a set of values predefined
4027 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4028 * Any non zero return here is treated as an "out of resource' op here.
4031 * Generate struct se_task(s) and/or their payloads for this CDB.
4033 int transport_generic_new_cmd(struct se_cmd
*cmd
)
4038 * Determine is the TCM fabric module has already allocated physical
4039 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4042 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
4044 ret
= transport_generic_get_mem(cmd
);
4049 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4050 * control or data CDB types, and perform the map to backend subsystem
4051 * code from SGL memory allocated here by transport_generic_get_mem(), or
4052 * via pre-existing SGL memory setup explictly by fabric module code with
4053 * transport_generic_map_mem_to_cmd().
4055 ret
= transport_new_cmd_obj(cmd
);
4059 * For WRITEs, let the fabric know its buffer is ready..
4060 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4061 * will be added to the struct se_device execution queue after its WRITE
4062 * data has arrived. (ie: It gets handled by the transport processing
4063 * thread a second time)
4065 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4066 transport_add_tasks_to_state_queue(cmd
);
4067 return transport_generic_write_pending(cmd
);
4070 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4071 * to the execution queue.
4073 transport_execute_tasks(cmd
);
4076 EXPORT_SYMBOL(transport_generic_new_cmd
);
4078 /* transport_generic_process_write():
4082 void transport_generic_process_write(struct se_cmd
*cmd
)
4084 transport_execute_tasks(cmd
);
4086 EXPORT_SYMBOL(transport_generic_process_write
);
4088 static void transport_write_pending_qf(struct se_cmd
*cmd
)
4090 if (cmd
->se_tfo
->write_pending(cmd
) == -EAGAIN
) {
4091 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4093 transport_handle_queue_full(cmd
, cmd
->se_dev
);
4097 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4099 unsigned long flags
;
4102 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4103 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4104 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4107 * Clear the se_cmd for WRITE_PENDING status in order to set
4108 * cmd->t_transport_active=0 so that transport_generic_handle_data
4109 * can be called from HW target mode interrupt code. This is safe
4110 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4111 * because the se_cmd->se_lun pointer is not being cleared.
4113 transport_cmd_check_stop(cmd
, 1, 0);
4116 * Call the fabric write_pending function here to let the
4117 * frontend know that WRITE buffers are ready.
4119 ret
= cmd
->se_tfo
->write_pending(cmd
);
4125 return PYX_TRANSPORT_WRITE_PENDING
;
4128 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4129 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4130 transport_handle_queue_full(cmd
, cmd
->se_dev
);
4135 * transport_release_cmd - free a command
4136 * @cmd: command to free
4138 * This routine unconditionally frees a command, and reference counting
4139 * or list removal must be done in the caller.
4141 void transport_release_cmd(struct se_cmd
*cmd
)
4143 BUG_ON(!cmd
->se_tfo
);
4145 if (cmd
->se_tmr_req
)
4146 core_tmr_release_req(cmd
->se_tmr_req
);
4147 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
4148 kfree(cmd
->t_task_cdb
);
4149 cmd
->se_tfo
->release_cmd(cmd
);
4151 EXPORT_SYMBOL(transport_release_cmd
);
4153 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
4155 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
4156 if (wait_for_tasks
&& cmd
->se_tmr_req
)
4157 transport_wait_for_tasks(cmd
);
4159 transport_release_cmd(cmd
);
4162 transport_wait_for_tasks(cmd
);
4164 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4167 transport_lun_remove_cmd(cmd
);
4169 transport_free_dev_tasks(cmd
);
4171 transport_put_cmd(cmd
);
4174 EXPORT_SYMBOL(transport_generic_free_cmd
);
4176 /* transport_lun_wait_for_tasks():
4178 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4179 * an struct se_lun to be successfully shutdown.
4181 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4183 unsigned long flags
;
4186 * If the frontend has already requested this struct se_cmd to
4187 * be stopped, we can safely ignore this struct se_cmd.
4189 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4190 if (atomic_read(&cmd
->t_transport_stop
)) {
4191 atomic_set(&cmd
->transport_lun_stop
, 0);
4192 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4193 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4194 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4195 transport_cmd_check_stop(cmd
, 1, 0);
4198 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4199 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4201 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4203 ret
= transport_stop_tasks_for_cmd(cmd
);
4205 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4206 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4208 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4209 cmd
->se_tfo
->get_task_tag(cmd
));
4210 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4211 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4212 cmd
->se_tfo
->get_task_tag(cmd
));
4214 transport_remove_cmd_from_queue(cmd
);
4219 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4221 struct se_cmd
*cmd
= NULL
;
4222 unsigned long lun_flags
, cmd_flags
;
4224 * Do exception processing and return CHECK_CONDITION status to the
4227 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4228 while (!list_empty(&lun
->lun_cmd_list
)) {
4229 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4230 struct se_cmd
, se_lun_node
);
4231 list_del(&cmd
->se_lun_node
);
4233 atomic_set(&cmd
->transport_lun_active
, 0);
4235 * This will notify iscsi_target_transport.c:
4236 * transport_cmd_check_stop() that a LUN shutdown is in
4237 * progress for the iscsi_cmd_t.
4239 spin_lock(&cmd
->t_state_lock
);
4240 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4241 "_lun_stop for ITT: 0x%08x\n",
4242 cmd
->se_lun
->unpacked_lun
,
4243 cmd
->se_tfo
->get_task_tag(cmd
));
4244 atomic_set(&cmd
->transport_lun_stop
, 1);
4245 spin_unlock(&cmd
->t_state_lock
);
4247 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4250 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4251 cmd
->se_tfo
->get_task_tag(cmd
),
4252 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4256 * If the Storage engine still owns the iscsi_cmd_t, determine
4257 * and/or stop its context.
4259 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4260 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4261 cmd
->se_tfo
->get_task_tag(cmd
));
4263 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4264 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4268 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4269 "_wait_for_tasks(): SUCCESS\n",
4270 cmd
->se_lun
->unpacked_lun
,
4271 cmd
->se_tfo
->get_task_tag(cmd
));
4273 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4274 if (!atomic_read(&cmd
->transport_dev_active
)) {
4275 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4278 atomic_set(&cmd
->transport_dev_active
, 0);
4279 transport_all_task_dev_remove_state(cmd
);
4280 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4282 transport_free_dev_tasks(cmd
);
4284 * The Storage engine stopped this struct se_cmd before it was
4285 * send to the fabric frontend for delivery back to the
4286 * Initiator Node. Return this SCSI CDB back with an
4287 * CHECK_CONDITION status.
4290 transport_send_check_condition_and_sense(cmd
,
4291 TCM_NON_EXISTENT_LUN
, 0);
4293 * If the fabric frontend is waiting for this iscsi_cmd_t to
4294 * be released, notify the waiting thread now that LU has
4295 * finished accessing it.
4297 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4298 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4299 pr_debug("SE_LUN[%d] - Detected FE stop for"
4300 " struct se_cmd: %p ITT: 0x%08x\n",
4302 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4304 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4306 transport_cmd_check_stop(cmd
, 1, 0);
4307 complete(&cmd
->transport_lun_fe_stop_comp
);
4308 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4311 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4312 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4314 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4315 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4317 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4320 static int transport_clear_lun_thread(void *p
)
4322 struct se_lun
*lun
= (struct se_lun
*)p
;
4324 __transport_clear_lun_from_sessions(lun
);
4325 complete(&lun
->lun_shutdown_comp
);
4330 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4332 struct task_struct
*kt
;
4334 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4335 "tcm_cl_%u", lun
->unpacked_lun
);
4337 pr_err("Unable to start clear_lun thread\n");
4340 wait_for_completion(&lun
->lun_shutdown_comp
);
4346 * transport_wait_for_tasks - wait for completion to occur
4347 * @cmd: command to wait
4349 * Called from frontend fabric context to wait for storage engine
4350 * to pause and/or release frontend generated struct se_cmd.
4352 void transport_wait_for_tasks(struct se_cmd
*cmd
)
4354 unsigned long flags
;
4356 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4357 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
)) {
4358 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4362 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4363 * has been set in transport_set_supported_SAM_opcode().
4365 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) && !cmd
->se_tmr_req
) {
4366 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4370 * If we are already stopped due to an external event (ie: LUN shutdown)
4371 * sleep until the connection can have the passed struct se_cmd back.
4372 * The cmd->transport_lun_stopped_sem will be upped by
4373 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4374 * has completed its operation on the struct se_cmd.
4376 if (atomic_read(&cmd
->transport_lun_stop
)) {
4378 pr_debug("wait_for_tasks: Stopping"
4379 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4380 "_stop_comp); for ITT: 0x%08x\n",
4381 cmd
->se_tfo
->get_task_tag(cmd
));
4383 * There is a special case for WRITES where a FE exception +
4384 * LUN shutdown means ConfigFS context is still sleeping on
4385 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4386 * We go ahead and up transport_lun_stop_comp just to be sure
4389 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4390 complete(&cmd
->transport_lun_stop_comp
);
4391 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4392 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4394 transport_all_task_dev_remove_state(cmd
);
4396 * At this point, the frontend who was the originator of this
4397 * struct se_cmd, now owns the structure and can be released through
4398 * normal means below.
4400 pr_debug("wait_for_tasks: Stopped"
4401 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4402 "stop_comp); for ITT: 0x%08x\n",
4403 cmd
->se_tfo
->get_task_tag(cmd
));
4405 atomic_set(&cmd
->transport_lun_stop
, 0);
4407 if (!atomic_read(&cmd
->t_transport_active
) ||
4408 atomic_read(&cmd
->t_transport_aborted
)) {
4409 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4413 atomic_set(&cmd
->t_transport_stop
, 1);
4415 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4416 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4417 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4418 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4420 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4422 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4424 wait_for_completion(&cmd
->t_transport_stop_comp
);
4426 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4427 atomic_set(&cmd
->t_transport_active
, 0);
4428 atomic_set(&cmd
->t_transport_stop
, 0);
4430 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4431 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4432 cmd
->se_tfo
->get_task_tag(cmd
));
4434 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4436 EXPORT_SYMBOL(transport_wait_for_tasks
);
4438 static int transport_get_sense_codes(
4443 *asc
= cmd
->scsi_asc
;
4444 *ascq
= cmd
->scsi_ascq
;
4449 static int transport_set_sense_codes(
4454 cmd
->scsi_asc
= asc
;
4455 cmd
->scsi_ascq
= ascq
;
4460 int transport_send_check_condition_and_sense(
4465 unsigned char *buffer
= cmd
->sense_buffer
;
4466 unsigned long flags
;
4468 u8 asc
= 0, ascq
= 0;
4470 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4471 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4472 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4475 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4476 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4478 if (!reason
&& from_transport
)
4481 if (!from_transport
)
4482 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4484 * Data Segment and SenseLength of the fabric response PDU.
4486 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4487 * from include/scsi/scsi_cmnd.h
4489 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4490 TRANSPORT_SENSE_BUFFER
);
4492 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4493 * SENSE KEY values from include/scsi/scsi.h
4496 case TCM_NON_EXISTENT_LUN
:
4498 buffer
[offset
] = 0x70;
4499 /* ILLEGAL REQUEST */
4500 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4501 /* LOGICAL UNIT NOT SUPPORTED */
4502 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4504 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4505 case TCM_SECTOR_COUNT_TOO_MANY
:
4507 buffer
[offset
] = 0x70;
4508 /* ILLEGAL REQUEST */
4509 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4510 /* INVALID COMMAND OPERATION CODE */
4511 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4513 case TCM_UNKNOWN_MODE_PAGE
:
4515 buffer
[offset
] = 0x70;
4516 /* ILLEGAL REQUEST */
4517 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4518 /* INVALID FIELD IN CDB */
4519 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4521 case TCM_CHECK_CONDITION_ABORT_CMD
:
4523 buffer
[offset
] = 0x70;
4524 /* ABORTED COMMAND */
4525 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4526 /* BUS DEVICE RESET FUNCTION OCCURRED */
4527 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4528 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4530 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4532 buffer
[offset
] = 0x70;
4533 /* ABORTED COMMAND */
4534 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4536 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4537 /* NOT ENOUGH UNSOLICITED DATA */
4538 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4540 case TCM_INVALID_CDB_FIELD
:
4542 buffer
[offset
] = 0x70;
4543 /* ABORTED COMMAND */
4544 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4545 /* INVALID FIELD IN CDB */
4546 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4548 case TCM_INVALID_PARAMETER_LIST
:
4550 buffer
[offset
] = 0x70;
4551 /* ABORTED COMMAND */
4552 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4553 /* INVALID FIELD IN PARAMETER LIST */
4554 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4556 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4558 buffer
[offset
] = 0x70;
4559 /* ABORTED COMMAND */
4560 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4562 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4563 /* UNEXPECTED_UNSOLICITED_DATA */
4564 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4566 case TCM_SERVICE_CRC_ERROR
:
4568 buffer
[offset
] = 0x70;
4569 /* ABORTED COMMAND */
4570 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4571 /* PROTOCOL SERVICE CRC ERROR */
4572 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4574 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4576 case TCM_SNACK_REJECTED
:
4578 buffer
[offset
] = 0x70;
4579 /* ABORTED COMMAND */
4580 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4582 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4583 /* FAILED RETRANSMISSION REQUEST */
4584 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4586 case TCM_WRITE_PROTECTED
:
4588 buffer
[offset
] = 0x70;
4590 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4591 /* WRITE PROTECTED */
4592 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4594 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4596 buffer
[offset
] = 0x70;
4597 /* UNIT ATTENTION */
4598 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4599 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4600 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4601 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4603 case TCM_CHECK_CONDITION_NOT_READY
:
4605 buffer
[offset
] = 0x70;
4607 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4608 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4609 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4610 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4612 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4615 buffer
[offset
] = 0x70;
4616 /* ILLEGAL REQUEST */
4617 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4618 /* LOGICAL UNIT COMMUNICATION FAILURE */
4619 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4623 * This code uses linux/include/scsi/scsi.h SAM status codes!
4625 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4627 * Automatically padded, this value is encoded in the fabric's
4628 * data_length response PDU containing the SCSI defined sense data.
4630 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4633 return cmd
->se_tfo
->queue_status(cmd
);
4635 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4637 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4641 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4643 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4646 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4647 " status for CDB: 0x%02x ITT: 0x%08x\n",
4649 cmd
->se_tfo
->get_task_tag(cmd
));
4651 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4652 cmd
->se_tfo
->queue_status(cmd
);
4657 EXPORT_SYMBOL(transport_check_aborted_status
);
4659 void transport_send_task_abort(struct se_cmd
*cmd
)
4661 unsigned long flags
;
4663 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4664 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4665 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4668 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4671 * If there are still expected incoming fabric WRITEs, we wait
4672 * until until they have completed before sending a TASK_ABORTED
4673 * response. This response with TASK_ABORTED status will be
4674 * queued back to fabric module by transport_check_aborted_status().
4676 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4677 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4678 atomic_inc(&cmd
->t_transport_aborted
);
4679 smp_mb__after_atomic_inc();
4680 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4681 transport_new_cmd_failure(cmd
);
4685 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4687 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4688 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4689 cmd
->se_tfo
->get_task_tag(cmd
));
4691 cmd
->se_tfo
->queue_status(cmd
);
4694 /* transport_generic_do_tmr():
4698 int transport_generic_do_tmr(struct se_cmd
*cmd
)
4700 struct se_device
*dev
= cmd
->se_dev
;
4701 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4704 switch (tmr
->function
) {
4705 case TMR_ABORT_TASK
:
4706 tmr
->response
= TMR_FUNCTION_REJECTED
;
4708 case TMR_ABORT_TASK_SET
:
4710 case TMR_CLEAR_TASK_SET
:
4711 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4714 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4715 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4716 TMR_FUNCTION_REJECTED
;
4718 case TMR_TARGET_WARM_RESET
:
4719 tmr
->response
= TMR_FUNCTION_REJECTED
;
4721 case TMR_TARGET_COLD_RESET
:
4722 tmr
->response
= TMR_FUNCTION_REJECTED
;
4725 pr_err("Uknown TMR function: 0x%02x.\n",
4727 tmr
->response
= TMR_FUNCTION_REJECTED
;
4731 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4732 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4734 transport_cmd_check_stop_to_fabric(cmd
);
4738 /* transport_processing_thread():
4742 static int transport_processing_thread(void *param
)
4746 struct se_device
*dev
= (struct se_device
*) param
;
4748 set_user_nice(current
, -20);
4750 while (!kthread_should_stop()) {
4751 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4752 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4753 kthread_should_stop());
4758 __transport_execute_tasks(dev
);
4760 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4764 switch (cmd
->t_state
) {
4765 case TRANSPORT_NEW_CMD
:
4768 case TRANSPORT_NEW_CMD_MAP
:
4769 if (!cmd
->se_tfo
->new_cmd_map
) {
4770 pr_err("cmd->se_tfo->new_cmd_map is"
4771 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4774 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4776 cmd
->transport_error_status
= ret
;
4777 transport_generic_request_failure(cmd
,
4778 0, (cmd
->data_direction
!=
4782 ret
= transport_generic_new_cmd(cmd
);
4786 cmd
->transport_error_status
= ret
;
4787 transport_generic_request_failure(cmd
,
4788 0, (cmd
->data_direction
!=
4792 case TRANSPORT_PROCESS_WRITE
:
4793 transport_generic_process_write(cmd
);
4795 case TRANSPORT_FREE_CMD_INTR
:
4796 transport_generic_free_cmd(cmd
, 0);
4798 case TRANSPORT_PROCESS_TMR
:
4799 transport_generic_do_tmr(cmd
);
4801 case TRANSPORT_COMPLETE_QF_WP
:
4802 transport_write_pending_qf(cmd
);
4804 case TRANSPORT_COMPLETE_QF_OK
:
4805 transport_complete_qf(cmd
);
4808 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4809 "i_state: %d on SE LUN: %u\n",
4811 cmd
->se_tfo
->get_task_tag(cmd
),
4812 cmd
->se_tfo
->get_cmd_state(cmd
),
4813 cmd
->se_lun
->unpacked_lun
);
4821 WARN_ON(!list_empty(&dev
->state_task_list
));
4822 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4823 dev
->process_thread
= NULL
;