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 int transport_generic_get_mem(struct se_cmd
*cmd
);
81 static void transport_put_cmd(struct se_cmd
*cmd
);
82 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
);
83 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
84 static void transport_generic_request_failure(struct se_cmd
*, int, int);
85 static void target_complete_ok_work(struct work_struct
*work
);
87 int init_se_kmem_caches(void)
89 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
90 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
92 pr_err("kmem_cache_create for struct se_cmd failed\n");
95 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
96 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
98 if (!se_tmr_req_cache
) {
99 pr_err("kmem_cache_create() for struct se_tmr_req"
101 goto out_free_cmd_cache
;
103 se_sess_cache
= kmem_cache_create("se_sess_cache",
104 sizeof(struct se_session
), __alignof__(struct se_session
),
106 if (!se_sess_cache
) {
107 pr_err("kmem_cache_create() for struct se_session"
109 goto out_free_tmr_req_cache
;
111 se_ua_cache
= kmem_cache_create("se_ua_cache",
112 sizeof(struct se_ua
), __alignof__(struct se_ua
),
115 pr_err("kmem_cache_create() for struct se_ua failed\n");
116 goto out_free_sess_cache
;
118 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
119 sizeof(struct t10_pr_registration
),
120 __alignof__(struct t10_pr_registration
), 0, NULL
);
121 if (!t10_pr_reg_cache
) {
122 pr_err("kmem_cache_create() for struct t10_pr_registration"
124 goto out_free_ua_cache
;
126 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
127 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
129 if (!t10_alua_lu_gp_cache
) {
130 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
132 goto out_free_pr_reg_cache
;
134 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
135 sizeof(struct t10_alua_lu_gp_member
),
136 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
137 if (!t10_alua_lu_gp_mem_cache
) {
138 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
140 goto out_free_lu_gp_cache
;
142 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
143 sizeof(struct t10_alua_tg_pt_gp
),
144 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
145 if (!t10_alua_tg_pt_gp_cache
) {
146 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
148 goto out_free_lu_gp_mem_cache
;
150 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
151 "t10_alua_tg_pt_gp_mem_cache",
152 sizeof(struct t10_alua_tg_pt_gp_member
),
153 __alignof__(struct t10_alua_tg_pt_gp_member
),
155 if (!t10_alua_tg_pt_gp_mem_cache
) {
156 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
158 goto out_free_tg_pt_gp_cache
;
161 target_completion_wq
= alloc_workqueue("target_completion",
163 if (!target_completion_wq
)
164 goto out_free_tg_pt_gp_mem_cache
;
168 out_free_tg_pt_gp_mem_cache
:
169 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
170 out_free_tg_pt_gp_cache
:
171 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
172 out_free_lu_gp_mem_cache
:
173 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
174 out_free_lu_gp_cache
:
175 kmem_cache_destroy(t10_alua_lu_gp_cache
);
176 out_free_pr_reg_cache
:
177 kmem_cache_destroy(t10_pr_reg_cache
);
179 kmem_cache_destroy(se_ua_cache
);
181 kmem_cache_destroy(se_sess_cache
);
182 out_free_tmr_req_cache
:
183 kmem_cache_destroy(se_tmr_req_cache
);
185 kmem_cache_destroy(se_cmd_cache
);
190 void release_se_kmem_caches(void)
192 destroy_workqueue(target_completion_wq
);
193 kmem_cache_destroy(se_cmd_cache
);
194 kmem_cache_destroy(se_tmr_req_cache
);
195 kmem_cache_destroy(se_sess_cache
);
196 kmem_cache_destroy(se_ua_cache
);
197 kmem_cache_destroy(t10_pr_reg_cache
);
198 kmem_cache_destroy(t10_alua_lu_gp_cache
);
199 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
200 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
201 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
204 /* This code ensures unique mib indexes are handed out. */
205 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
206 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
209 * Allocate a new row index for the entry type specified
211 u32
scsi_get_new_index(scsi_index_t type
)
215 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
217 spin_lock(&scsi_mib_index_lock
);
218 new_index
= ++scsi_mib_index
[type
];
219 spin_unlock(&scsi_mib_index_lock
);
224 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
226 atomic_set(&qobj
->queue_cnt
, 0);
227 INIT_LIST_HEAD(&qobj
->qobj_list
);
228 init_waitqueue_head(&qobj
->thread_wq
);
229 spin_lock_init(&qobj
->cmd_queue_lock
);
231 EXPORT_SYMBOL(transport_init_queue_obj
);
233 void transport_subsystem_check_init(void)
237 if (sub_api_initialized
)
240 ret
= request_module("target_core_iblock");
242 pr_err("Unable to load target_core_iblock\n");
244 ret
= request_module("target_core_file");
246 pr_err("Unable to load target_core_file\n");
248 ret
= request_module("target_core_pscsi");
250 pr_err("Unable to load target_core_pscsi\n");
252 ret
= request_module("target_core_stgt");
254 pr_err("Unable to load target_core_stgt\n");
256 sub_api_initialized
= 1;
260 struct se_session
*transport_init_session(void)
262 struct se_session
*se_sess
;
264 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
266 pr_err("Unable to allocate struct se_session from"
268 return ERR_PTR(-ENOMEM
);
270 INIT_LIST_HEAD(&se_sess
->sess_list
);
271 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
275 EXPORT_SYMBOL(transport_init_session
);
278 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
280 void __transport_register_session(
281 struct se_portal_group
*se_tpg
,
282 struct se_node_acl
*se_nacl
,
283 struct se_session
*se_sess
,
284 void *fabric_sess_ptr
)
286 unsigned char buf
[PR_REG_ISID_LEN
];
288 se_sess
->se_tpg
= se_tpg
;
289 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
291 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
293 * Only set for struct se_session's that will actually be moving I/O.
294 * eg: *NOT* discovery sessions.
298 * If the fabric module supports an ISID based TransportID,
299 * save this value in binary from the fabric I_T Nexus now.
301 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
302 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
303 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
304 &buf
[0], PR_REG_ISID_LEN
);
305 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
307 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
309 * The se_nacl->nacl_sess pointer will be set to the
310 * last active I_T Nexus for each struct se_node_acl.
312 se_nacl
->nacl_sess
= se_sess
;
314 list_add_tail(&se_sess
->sess_acl_list
,
315 &se_nacl
->acl_sess_list
);
316 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
318 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
320 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
321 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
323 EXPORT_SYMBOL(__transport_register_session
);
325 void transport_register_session(
326 struct se_portal_group
*se_tpg
,
327 struct se_node_acl
*se_nacl
,
328 struct se_session
*se_sess
,
329 void *fabric_sess_ptr
)
331 spin_lock_bh(&se_tpg
->session_lock
);
332 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
333 spin_unlock_bh(&se_tpg
->session_lock
);
335 EXPORT_SYMBOL(transport_register_session
);
337 void transport_deregister_session_configfs(struct se_session
*se_sess
)
339 struct se_node_acl
*se_nacl
;
342 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
344 se_nacl
= se_sess
->se_node_acl
;
346 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
347 list_del(&se_sess
->sess_acl_list
);
349 * If the session list is empty, then clear the pointer.
350 * Otherwise, set the struct se_session pointer from the tail
351 * element of the per struct se_node_acl active session list.
353 if (list_empty(&se_nacl
->acl_sess_list
))
354 se_nacl
->nacl_sess
= NULL
;
356 se_nacl
->nacl_sess
= container_of(
357 se_nacl
->acl_sess_list
.prev
,
358 struct se_session
, sess_acl_list
);
360 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
363 EXPORT_SYMBOL(transport_deregister_session_configfs
);
365 void transport_free_session(struct se_session
*se_sess
)
367 kmem_cache_free(se_sess_cache
, se_sess
);
369 EXPORT_SYMBOL(transport_free_session
);
371 void transport_deregister_session(struct se_session
*se_sess
)
373 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
374 struct se_node_acl
*se_nacl
;
378 transport_free_session(se_sess
);
382 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
383 list_del(&se_sess
->sess_list
);
384 se_sess
->se_tpg
= NULL
;
385 se_sess
->fabric_sess_ptr
= NULL
;
386 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
389 * Determine if we need to do extra work for this initiator node's
390 * struct se_node_acl if it had been previously dynamically generated.
392 se_nacl
= se_sess
->se_node_acl
;
394 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
395 if (se_nacl
->dynamic_node_acl
) {
396 if (!se_tpg
->se_tpg_tfo
->tpg_check_demo_mode_cache(
398 list_del(&se_nacl
->acl_list
);
399 se_tpg
->num_node_acls
--;
400 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
402 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
403 core_free_device_list_for_node(se_nacl
, se_tpg
);
404 se_tpg
->se_tpg_tfo
->tpg_release_fabric_acl(se_tpg
,
406 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
409 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
412 transport_free_session(se_sess
);
414 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
415 se_tpg
->se_tpg_tfo
->get_fabric_name());
417 EXPORT_SYMBOL(transport_deregister_session
);
420 * Called with cmd->t_state_lock held.
422 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
424 struct se_device
*dev
= cmd
->se_dev
;
425 struct se_task
*task
;
431 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
432 if (task
->task_flags
& TF_ACTIVE
)
435 if (!atomic_read(&task
->task_state_active
))
438 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
439 list_del(&task
->t_state_list
);
440 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
441 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
442 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
444 atomic_set(&task
->task_state_active
, 0);
445 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
449 /* transport_cmd_check_stop():
451 * 'transport_off = 1' determines if t_transport_active should be cleared.
452 * 'transport_off = 2' determines if task_dev_state should be removed.
454 * A non-zero u8 t_state sets cmd->t_state.
455 * Returns 1 when command is stopped, else 0.
457 static int transport_cmd_check_stop(
464 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
466 * Determine if IOCTL context caller in requesting the stopping of this
467 * command for LUN shutdown purposes.
469 if (atomic_read(&cmd
->transport_lun_stop
)) {
470 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
471 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
472 cmd
->se_tfo
->get_task_tag(cmd
));
474 atomic_set(&cmd
->t_transport_active
, 0);
475 if (transport_off
== 2)
476 transport_all_task_dev_remove_state(cmd
);
477 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
479 complete(&cmd
->transport_lun_stop_comp
);
483 * Determine if frontend context caller is requesting the stopping of
484 * this command for frontend exceptions.
486 if (atomic_read(&cmd
->t_transport_stop
)) {
487 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
488 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
489 cmd
->se_tfo
->get_task_tag(cmd
));
491 if (transport_off
== 2)
492 transport_all_task_dev_remove_state(cmd
);
495 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
498 if (transport_off
== 2)
500 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
502 complete(&cmd
->t_transport_stop_comp
);
506 atomic_set(&cmd
->t_transport_active
, 0);
507 if (transport_off
== 2) {
508 transport_all_task_dev_remove_state(cmd
);
510 * Clear struct se_cmd->se_lun before the transport_off == 2
511 * handoff to fabric module.
515 * Some fabric modules like tcm_loop can release
516 * their internally allocated I/O reference now and
519 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
520 spin_unlock_irqrestore(
521 &cmd
->t_state_lock
, flags
);
523 cmd
->se_tfo
->check_stop_free(cmd
);
527 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
531 cmd
->t_state
= t_state
;
532 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
537 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
539 return transport_cmd_check_stop(cmd
, 2, 0);
542 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
544 struct se_lun
*lun
= cmd
->se_lun
;
550 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
551 if (!atomic_read(&cmd
->transport_dev_active
)) {
552 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
555 atomic_set(&cmd
->transport_dev_active
, 0);
556 transport_all_task_dev_remove_state(cmd
);
557 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
561 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
562 if (atomic_read(&cmd
->transport_lun_active
)) {
563 list_del(&cmd
->se_lun_node
);
564 atomic_set(&cmd
->transport_lun_active
, 0);
566 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
567 cmd
->se_tfo
->get_task_tag(cmd
), lun
->unpacked_lun
);
570 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
573 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
575 if (!cmd
->se_tmr_req
)
576 transport_lun_remove_cmd(cmd
);
578 if (transport_cmd_check_stop_to_fabric(cmd
))
581 transport_remove_cmd_from_queue(cmd
);
582 transport_put_cmd(cmd
);
586 static void transport_add_cmd_to_queue(struct se_cmd
*cmd
, int t_state
,
589 struct se_device
*dev
= cmd
->se_dev
;
590 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
594 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
595 cmd
->t_state
= t_state
;
596 atomic_set(&cmd
->t_transport_active
, 1);
597 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
600 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
602 /* If the cmd is already on the list, remove it before we add it */
603 if (!list_empty(&cmd
->se_queue_node
))
604 list_del(&cmd
->se_queue_node
);
606 atomic_inc(&qobj
->queue_cnt
);
609 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
611 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
612 atomic_set(&cmd
->t_transport_queue_active
, 1);
613 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
615 wake_up_interruptible(&qobj
->thread_wq
);
618 static struct se_cmd
*
619 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
624 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
625 if (list_empty(&qobj
->qobj_list
)) {
626 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
629 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
631 atomic_set(&cmd
->t_transport_queue_active
, 0);
633 list_del_init(&cmd
->se_queue_node
);
634 atomic_dec(&qobj
->queue_cnt
);
635 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
640 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
)
642 struct se_queue_obj
*qobj
= &cmd
->se_dev
->dev_queue_obj
;
645 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
646 if (!atomic_read(&cmd
->t_transport_queue_active
)) {
647 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
650 atomic_set(&cmd
->t_transport_queue_active
, 0);
651 atomic_dec(&qobj
->queue_cnt
);
652 list_del_init(&cmd
->se_queue_node
);
653 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
655 if (atomic_read(&cmd
->t_transport_queue_active
)) {
656 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
657 cmd
->se_tfo
->get_task_tag(cmd
),
658 atomic_read(&cmd
->t_transport_queue_active
));
663 * Completion function used by TCM subsystem plugins (such as FILEIO)
664 * for queueing up response from struct se_subsystem_api->do_task()
666 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
668 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
669 struct se_task
, t_list
);
672 cmd
->scsi_status
= SAM_STAT_GOOD
;
673 task
->task_scsi_status
= GOOD
;
675 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
676 task
->task_error_status
= PYX_TRANSPORT_ILLEGAL_REQUEST
;
677 task
->task_se_cmd
->transport_error_status
=
678 PYX_TRANSPORT_ILLEGAL_REQUEST
;
681 transport_complete_task(task
, good
);
683 EXPORT_SYMBOL(transport_complete_sync_cache
);
685 static void target_complete_timeout_work(struct work_struct
*work
)
687 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
691 * Reset cmd->t_se_count to allow transport_put_cmd()
692 * to allow last call to free memory resources.
694 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
695 if (atomic_read(&cmd
->t_transport_timeout
) > 1) {
696 int tmp
= (atomic_read(&cmd
->t_transport_timeout
) - 1);
698 atomic_sub(tmp
, &cmd
->t_se_count
);
700 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
702 transport_put_cmd(cmd
);
705 static void target_complete_failure_work(struct work_struct
*work
)
707 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
709 transport_generic_request_failure(cmd
, 1, 1);
712 /* transport_complete_task():
714 * Called from interrupt and non interrupt context depending
715 * on the transport plugin.
717 void transport_complete_task(struct se_task
*task
, int success
)
719 struct se_cmd
*cmd
= task
->task_se_cmd
;
720 struct se_device
*dev
= cmd
->se_dev
;
723 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
724 cmd
->t_task_cdb
[0], dev
);
727 atomic_inc(&dev
->depth_left
);
729 del_timer(&task
->task_timer
);
731 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
732 task
->task_flags
&= ~TF_ACTIVE
;
735 * See if any sense data exists, if so set the TASK_SENSE flag.
736 * Also check for any other post completion work that needs to be
737 * done by the plugins.
739 if (dev
&& dev
->transport
->transport_complete
) {
740 if (dev
->transport
->transport_complete(task
) != 0) {
741 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
742 task
->task_sense
= 1;
748 * See if we are waiting for outstanding struct se_task
749 * to complete for an exception condition
751 if (task
->task_flags
& TF_REQUEST_STOP
) {
753 * Decrement cmd->t_se_count if this task had
754 * previously thrown its timeout exception handler.
756 if (task
->task_flags
& TF_TIMEOUT
) {
757 atomic_dec(&cmd
->t_se_count
);
758 task
->task_flags
&= ~TF_TIMEOUT
;
760 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
762 complete(&task
->task_stop_comp
);
766 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
767 * left counter to determine when the struct se_cmd is ready to be queued to
768 * the processing thread.
770 if (task
->task_flags
& TF_TIMEOUT
) {
771 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_timeout_left
)) {
772 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
775 INIT_WORK(&cmd
->work
, target_complete_timeout_work
);
778 atomic_dec(&cmd
->t_task_cdbs_timeout_left
);
781 * Decrement the outstanding t_task_cdbs_left count. The last
782 * struct se_task from struct se_cmd will complete itself into the
783 * device queue depending upon int success.
785 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
786 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
790 if (!success
|| cmd
->t_tasks_failed
) {
791 if (!task
->task_error_status
) {
792 task
->task_error_status
=
793 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
794 cmd
->transport_error_status
=
795 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
797 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
799 atomic_set(&cmd
->t_transport_complete
, 1);
800 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
804 cmd
->t_state
= TRANSPORT_COMPLETE
;
805 atomic_set(&cmd
->t_transport_active
, 1);
806 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
808 queue_work(target_completion_wq
, &cmd
->work
);
810 EXPORT_SYMBOL(transport_complete_task
);
813 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
814 * struct se_task list are ready to be added to the active execution list
817 * Called with se_dev_t->execute_task_lock called.
819 static inline int transport_add_task_check_sam_attr(
820 struct se_task
*task
,
821 struct se_task
*task_prev
,
822 struct se_device
*dev
)
825 * No SAM Task attribute emulation enabled, add to tail of
828 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
829 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
833 * HEAD_OF_QUEUE attribute for received CDB, which means
834 * the first task that is associated with a struct se_cmd goes to
835 * head of the struct se_device->execute_task_list, and task_prev
836 * after that for each subsequent task
838 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
839 list_add(&task
->t_execute_list
,
840 (task_prev
!= NULL
) ?
841 &task_prev
->t_execute_list
:
842 &dev
->execute_task_list
);
844 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
845 " in execution queue\n",
846 task
->task_se_cmd
->t_task_cdb
[0]);
850 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
851 * transitioned from Dermant -> Active state, and are added to the end
852 * of the struct se_device->execute_task_list
854 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
858 /* __transport_add_task_to_execute_queue():
860 * Called with se_dev_t->execute_task_lock called.
862 static void __transport_add_task_to_execute_queue(
863 struct se_task
*task
,
864 struct se_task
*task_prev
,
865 struct se_device
*dev
)
869 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
870 atomic_inc(&dev
->execute_tasks
);
872 if (atomic_read(&task
->task_state_active
))
875 * Determine if this task needs to go to HEAD_OF_QUEUE for the
876 * state list as well. Running with SAM Task Attribute emulation
877 * will always return head_of_queue == 0 here
880 list_add(&task
->t_state_list
, (task_prev
) ?
881 &task_prev
->t_state_list
:
882 &dev
->state_task_list
);
884 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
886 atomic_set(&task
->task_state_active
, 1);
888 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
889 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
893 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
895 struct se_device
*dev
= cmd
->se_dev
;
896 struct se_task
*task
;
899 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
900 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
901 if (atomic_read(&task
->task_state_active
))
904 spin_lock(&dev
->execute_task_lock
);
905 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
906 atomic_set(&task
->task_state_active
, 1);
908 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
909 task
->task_se_cmd
->se_tfo
->get_task_tag(
910 task
->task_se_cmd
), task
, dev
);
912 spin_unlock(&dev
->execute_task_lock
);
914 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
917 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
919 struct se_device
*dev
= cmd
->se_dev
;
920 struct se_task
*task
, *task_prev
= NULL
;
923 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
924 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
925 if (!list_empty(&task
->t_execute_list
))
928 * __transport_add_task_to_execute_queue() handles the
929 * SAM Task Attribute emulation if enabled
931 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
934 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
937 void __transport_remove_task_from_execute_queue(struct se_task
*task
,
938 struct se_device
*dev
)
940 list_del_init(&task
->t_execute_list
);
941 atomic_dec(&dev
->execute_tasks
);
944 void transport_remove_task_from_execute_queue(
945 struct se_task
*task
,
946 struct se_device
*dev
)
950 if (WARN_ON(list_empty(&task
->t_execute_list
)))
953 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
954 __transport_remove_task_from_execute_queue(task
, dev
);
955 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
959 * Handle QUEUE_FULL / -EAGAIN status
962 static void target_qf_do_work(struct work_struct
*work
)
964 struct se_device
*dev
= container_of(work
, struct se_device
,
966 LIST_HEAD(qf_cmd_list
);
967 struct se_cmd
*cmd
, *cmd_tmp
;
969 spin_lock_irq(&dev
->qf_cmd_lock
);
970 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
971 spin_unlock_irq(&dev
->qf_cmd_lock
);
973 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
974 list_del(&cmd
->se_qf_node
);
975 atomic_dec(&dev
->dev_qf_count
);
976 smp_mb__after_atomic_dec();
978 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
979 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
980 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
981 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
984 transport_add_cmd_to_queue(cmd
, cmd
->t_state
, true);
988 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
990 switch (cmd
->data_direction
) {
993 case DMA_FROM_DEVICE
:
997 case DMA_BIDIRECTIONAL
:
1006 void transport_dump_dev_state(
1007 struct se_device
*dev
,
1011 *bl
+= sprintf(b
+ *bl
, "Status: ");
1012 switch (dev
->dev_status
) {
1013 case TRANSPORT_DEVICE_ACTIVATED
:
1014 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1016 case TRANSPORT_DEVICE_DEACTIVATED
:
1017 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1019 case TRANSPORT_DEVICE_SHUTDOWN
:
1020 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1022 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1023 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1024 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1027 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1031 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1032 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1034 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1035 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
1036 *bl
+= sprintf(b
+ *bl
, " ");
1039 void transport_dump_vpd_proto_id(
1040 struct t10_vpd
*vpd
,
1041 unsigned char *p_buf
,
1044 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1047 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1048 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1050 switch (vpd
->protocol_identifier
) {
1052 sprintf(buf
+len
, "Fibre Channel\n");
1055 sprintf(buf
+len
, "Parallel SCSI\n");
1058 sprintf(buf
+len
, "SSA\n");
1061 sprintf(buf
+len
, "IEEE 1394\n");
1064 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1068 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1071 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1074 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1078 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1081 sprintf(buf
+len
, "Unknown 0x%02x\n",
1082 vpd
->protocol_identifier
);
1087 strncpy(p_buf
, buf
, p_buf_len
);
1089 pr_debug("%s", buf
);
1093 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1096 * Check if the Protocol Identifier Valid (PIV) bit is set..
1098 * from spc3r23.pdf section 7.5.1
1100 if (page_83
[1] & 0x80) {
1101 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1102 vpd
->protocol_identifier_set
= 1;
1103 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1106 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1108 int transport_dump_vpd_assoc(
1109 struct t10_vpd
*vpd
,
1110 unsigned char *p_buf
,
1113 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1117 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1118 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1120 switch (vpd
->association
) {
1122 sprintf(buf
+len
, "addressed logical unit\n");
1125 sprintf(buf
+len
, "target port\n");
1128 sprintf(buf
+len
, "SCSI target device\n");
1131 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1137 strncpy(p_buf
, buf
, p_buf_len
);
1139 pr_debug("%s", buf
);
1144 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1147 * The VPD identification association..
1149 * from spc3r23.pdf Section 7.6.3.1 Table 297
1151 vpd
->association
= (page_83
[1] & 0x30);
1152 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1154 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1156 int transport_dump_vpd_ident_type(
1157 struct t10_vpd
*vpd
,
1158 unsigned char *p_buf
,
1161 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1165 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1166 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1168 switch (vpd
->device_identifier_type
) {
1170 sprintf(buf
+len
, "Vendor specific\n");
1173 sprintf(buf
+len
, "T10 Vendor ID based\n");
1176 sprintf(buf
+len
, "EUI-64 based\n");
1179 sprintf(buf
+len
, "NAA\n");
1182 sprintf(buf
+len
, "Relative target port identifier\n");
1185 sprintf(buf
+len
, "SCSI name string\n");
1188 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1189 vpd
->device_identifier_type
);
1195 if (p_buf_len
< strlen(buf
)+1)
1197 strncpy(p_buf
, buf
, p_buf_len
);
1199 pr_debug("%s", buf
);
1205 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1208 * The VPD identifier type..
1210 * from spc3r23.pdf Section 7.6.3.1 Table 298
1212 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1213 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1215 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1217 int transport_dump_vpd_ident(
1218 struct t10_vpd
*vpd
,
1219 unsigned char *p_buf
,
1222 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1225 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1227 switch (vpd
->device_identifier_code_set
) {
1228 case 0x01: /* Binary */
1229 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1230 &vpd
->device_identifier
[0]);
1232 case 0x02: /* ASCII */
1233 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1234 &vpd
->device_identifier
[0]);
1236 case 0x03: /* UTF-8 */
1237 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1238 &vpd
->device_identifier
[0]);
1241 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1242 " 0x%02x", vpd
->device_identifier_code_set
);
1248 strncpy(p_buf
, buf
, p_buf_len
);
1250 pr_debug("%s", buf
);
1256 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1258 static const char hex_str
[] = "0123456789abcdef";
1259 int j
= 0, i
= 4; /* offset to start of the identifer */
1262 * The VPD Code Set (encoding)
1264 * from spc3r23.pdf Section 7.6.3.1 Table 296
1266 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1267 switch (vpd
->device_identifier_code_set
) {
1268 case 0x01: /* Binary */
1269 vpd
->device_identifier
[j
++] =
1270 hex_str
[vpd
->device_identifier_type
];
1271 while (i
< (4 + page_83
[3])) {
1272 vpd
->device_identifier
[j
++] =
1273 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1274 vpd
->device_identifier
[j
++] =
1275 hex_str
[page_83
[i
] & 0x0f];
1279 case 0x02: /* ASCII */
1280 case 0x03: /* UTF-8 */
1281 while (i
< (4 + page_83
[3]))
1282 vpd
->device_identifier
[j
++] = page_83
[i
++];
1288 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1290 EXPORT_SYMBOL(transport_set_vpd_ident
);
1292 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1295 * If this device is from Target_Core_Mod/pSCSI, disable the
1296 * SAM Task Attribute emulation.
1298 * This is currently not available in upsream Linux/SCSI Target
1299 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1301 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1302 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1306 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1307 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1308 " device\n", dev
->transport
->name
,
1309 dev
->transport
->get_device_rev(dev
));
1312 static void scsi_dump_inquiry(struct se_device
*dev
)
1314 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1317 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1319 pr_debug(" Vendor: ");
1320 for (i
= 0; i
< 8; i
++)
1321 if (wwn
->vendor
[i
] >= 0x20)
1322 pr_debug("%c", wwn
->vendor
[i
]);
1326 pr_debug(" Model: ");
1327 for (i
= 0; i
< 16; i
++)
1328 if (wwn
->model
[i
] >= 0x20)
1329 pr_debug("%c", wwn
->model
[i
]);
1333 pr_debug(" Revision: ");
1334 for (i
= 0; i
< 4; i
++)
1335 if (wwn
->revision
[i
] >= 0x20)
1336 pr_debug("%c", wwn
->revision
[i
]);
1342 device_type
= dev
->transport
->get_device_type(dev
);
1343 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1344 pr_debug(" ANSI SCSI revision: %02x\n",
1345 dev
->transport
->get_device_rev(dev
));
1348 struct se_device
*transport_add_device_to_core_hba(
1350 struct se_subsystem_api
*transport
,
1351 struct se_subsystem_dev
*se_dev
,
1353 void *transport_dev
,
1354 struct se_dev_limits
*dev_limits
,
1355 const char *inquiry_prod
,
1356 const char *inquiry_rev
)
1359 struct se_device
*dev
;
1361 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1363 pr_err("Unable to allocate memory for se_dev_t\n");
1367 transport_init_queue_obj(&dev
->dev_queue_obj
);
1368 dev
->dev_flags
= device_flags
;
1369 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1370 dev
->dev_ptr
= transport_dev
;
1372 dev
->se_sub_dev
= se_dev
;
1373 dev
->transport
= transport
;
1374 atomic_set(&dev
->active_cmds
, 0);
1375 INIT_LIST_HEAD(&dev
->dev_list
);
1376 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1377 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1378 INIT_LIST_HEAD(&dev
->execute_task_list
);
1379 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1380 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1381 INIT_LIST_HEAD(&dev
->state_task_list
);
1382 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1383 spin_lock_init(&dev
->execute_task_lock
);
1384 spin_lock_init(&dev
->delayed_cmd_lock
);
1385 spin_lock_init(&dev
->ordered_cmd_lock
);
1386 spin_lock_init(&dev
->state_task_lock
);
1387 spin_lock_init(&dev
->dev_alua_lock
);
1388 spin_lock_init(&dev
->dev_reservation_lock
);
1389 spin_lock_init(&dev
->dev_status_lock
);
1390 spin_lock_init(&dev
->dev_status_thr_lock
);
1391 spin_lock_init(&dev
->se_port_lock
);
1392 spin_lock_init(&dev
->se_tmr_lock
);
1393 spin_lock_init(&dev
->qf_cmd_lock
);
1395 dev
->queue_depth
= dev_limits
->queue_depth
;
1396 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1397 atomic_set(&dev
->dev_ordered_id
, 0);
1399 se_dev_set_default_attribs(dev
, dev_limits
);
1401 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1402 dev
->creation_time
= get_jiffies_64();
1403 spin_lock_init(&dev
->stats_lock
);
1405 spin_lock(&hba
->device_lock
);
1406 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1408 spin_unlock(&hba
->device_lock
);
1410 * Setup the SAM Task Attribute emulation for struct se_device
1412 core_setup_task_attr_emulation(dev
);
1414 * Force PR and ALUA passthrough emulation with internal object use.
1416 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1418 * Setup the Reservations infrastructure for struct se_device
1420 core_setup_reservations(dev
, force_pt
);
1422 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1424 if (core_setup_alua(dev
, force_pt
) < 0)
1428 * Startup the struct se_device processing thread
1430 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1431 "LIO_%s", dev
->transport
->name
);
1432 if (IS_ERR(dev
->process_thread
)) {
1433 pr_err("Unable to create kthread: LIO_%s\n",
1434 dev
->transport
->name
);
1438 * Setup work_queue for QUEUE_FULL
1440 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1442 * Preload the initial INQUIRY const values if we are doing
1443 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1444 * passthrough because this is being provided by the backend LLD.
1445 * This is required so that transport_get_inquiry() copies these
1446 * originals once back into DEV_T10_WWN(dev) for the virtual device
1449 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1450 if (!inquiry_prod
|| !inquiry_rev
) {
1451 pr_err("All non TCM/pSCSI plugins require"
1452 " INQUIRY consts\n");
1456 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1457 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1458 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1460 scsi_dump_inquiry(dev
);
1464 kthread_stop(dev
->process_thread
);
1466 spin_lock(&hba
->device_lock
);
1467 list_del(&dev
->dev_list
);
1469 spin_unlock(&hba
->device_lock
);
1471 se_release_vpd_for_dev(dev
);
1477 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1479 /* transport_generic_prepare_cdb():
1481 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1482 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1483 * The point of this is since we are mapping iSCSI LUNs to
1484 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1485 * devices and HBAs for a loop.
1487 static inline void transport_generic_prepare_cdb(
1491 case READ_10
: /* SBC - RDProtect */
1492 case READ_12
: /* SBC - RDProtect */
1493 case READ_16
: /* SBC - RDProtect */
1494 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1495 case VERIFY
: /* SBC - VRProtect */
1496 case VERIFY_16
: /* SBC - VRProtect */
1497 case WRITE_VERIFY
: /* SBC - VRProtect */
1498 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1501 cdb
[1] &= 0x1f; /* clear logical unit number */
1506 static struct se_task
*
1507 transport_generic_get_task(struct se_cmd
*cmd
,
1508 enum dma_data_direction data_direction
)
1510 struct se_task
*task
;
1511 struct se_device
*dev
= cmd
->se_dev
;
1513 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1515 pr_err("Unable to allocate struct se_task\n");
1519 INIT_LIST_HEAD(&task
->t_list
);
1520 INIT_LIST_HEAD(&task
->t_execute_list
);
1521 INIT_LIST_HEAD(&task
->t_state_list
);
1522 init_timer(&task
->task_timer
);
1523 init_completion(&task
->task_stop_comp
);
1524 task
->task_se_cmd
= cmd
;
1525 task
->task_data_direction
= data_direction
;
1530 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1533 * Used by fabric modules containing a local struct se_cmd within their
1534 * fabric dependent per I/O descriptor.
1536 void transport_init_se_cmd(
1538 struct target_core_fabric_ops
*tfo
,
1539 struct se_session
*se_sess
,
1543 unsigned char *sense_buffer
)
1545 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1546 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1547 INIT_LIST_HEAD(&cmd
->se_ordered_node
);
1548 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1549 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1551 INIT_LIST_HEAD(&cmd
->t_task_list
);
1552 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1553 init_completion(&cmd
->transport_lun_stop_comp
);
1554 init_completion(&cmd
->t_transport_stop_comp
);
1555 spin_lock_init(&cmd
->t_state_lock
);
1556 atomic_set(&cmd
->transport_dev_active
, 1);
1559 cmd
->se_sess
= se_sess
;
1560 cmd
->data_length
= data_length
;
1561 cmd
->data_direction
= data_direction
;
1562 cmd
->sam_task_attr
= task_attr
;
1563 cmd
->sense_buffer
= sense_buffer
;
1565 EXPORT_SYMBOL(transport_init_se_cmd
);
1567 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1570 * Check if SAM Task Attribute emulation is enabled for this
1571 * struct se_device storage object
1573 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1576 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1577 pr_debug("SAM Task Attribute ACA"
1578 " emulation is not supported\n");
1582 * Used to determine when ORDERED commands should go from
1583 * Dormant to Active status.
1585 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1586 smp_mb__after_atomic_inc();
1587 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1588 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1589 cmd
->se_dev
->transport
->name
);
1593 /* transport_generic_allocate_tasks():
1595 * Called from fabric RX Thread.
1597 int transport_generic_allocate_tasks(
1603 transport_generic_prepare_cdb(cdb
);
1605 * Ensure that the received CDB is less than the max (252 + 8) bytes
1606 * for VARIABLE_LENGTH_CMD
1608 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1609 pr_err("Received SCSI CDB with command_size: %d that"
1610 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1611 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1615 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1616 * allocate the additional extended CDB buffer now.. Otherwise
1617 * setup the pointer from __t_task_cdb to t_task_cdb.
1619 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1620 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1622 if (!cmd
->t_task_cdb
) {
1623 pr_err("Unable to allocate cmd->t_task_cdb"
1624 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1625 scsi_command_size(cdb
),
1626 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1630 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1632 * Copy the original CDB into cmd->
1634 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1636 * Setup the received CDB based on SCSI defined opcodes and
1637 * perform unit attention, persistent reservations and ALUA
1638 * checks for virtual device backends. The cmd->t_task_cdb
1639 * pointer is expected to be setup before we reach this point.
1641 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1645 * Check for SAM Task Attribute Emulation
1647 if (transport_check_alloc_task_attr(cmd
) < 0) {
1648 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1649 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1652 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1653 if (cmd
->se_lun
->lun_sep
)
1654 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1655 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1658 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1661 * Used by fabric module frontends to queue tasks directly.
1662 * Many only be used from process context only
1664 int transport_handle_cdb_direct(
1671 pr_err("cmd->se_lun is NULL\n");
1674 if (in_interrupt()) {
1676 pr_err("transport_generic_handle_cdb cannot be called"
1677 " from interrupt context\n");
1681 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1682 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1683 * in existing usage to ensure that outstanding descriptors are handled
1684 * correctly during shutdown via transport_wait_for_tasks()
1686 * Also, we don't take cmd->t_state_lock here as we only expect
1687 * this to be called for initial descriptor submission.
1689 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1690 atomic_set(&cmd
->t_transport_active
, 1);
1692 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1693 * so follow TRANSPORT_NEW_CMD processing thread context usage
1694 * and call transport_generic_request_failure() if necessary..
1696 ret
= transport_generic_new_cmd(cmd
);
1700 cmd
->transport_error_status
= ret
;
1701 transport_generic_request_failure(cmd
, 0,
1702 (cmd
->data_direction
!= DMA_TO_DEVICE
));
1706 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1709 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1710 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1711 * complete setup in TCM process context w/ TFO->new_cmd_map().
1713 int transport_generic_handle_cdb_map(
1718 pr_err("cmd->se_lun is NULL\n");
1722 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
, false);
1725 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1727 /* transport_generic_handle_data():
1731 int transport_generic_handle_data(
1735 * For the software fabric case, then we assume the nexus is being
1736 * failed/shutdown when signals are pending from the kthread context
1737 * caller, so we return a failure. For the HW target mode case running
1738 * in interrupt code, the signal_pending() check is skipped.
1740 if (!in_interrupt() && signal_pending(current
))
1743 * If the received CDB has aleady been ABORTED by the generic
1744 * target engine, we now call transport_check_aborted_status()
1745 * to queue any delated TASK_ABORTED status for the received CDB to the
1746 * fabric module as we are expecting no further incoming DATA OUT
1747 * sequences at this point.
1749 if (transport_check_aborted_status(cmd
, 1) != 0)
1752 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
, false);
1755 EXPORT_SYMBOL(transport_generic_handle_data
);
1757 /* transport_generic_handle_tmr():
1761 int transport_generic_handle_tmr(
1764 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
, false);
1767 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1769 void transport_generic_free_cmd_intr(
1772 transport_add_cmd_to_queue(cmd
, TRANSPORT_FREE_CMD_INTR
, false);
1774 EXPORT_SYMBOL(transport_generic_free_cmd_intr
);
1777 * If the task is active, request it to be stopped and sleep until it
1780 bool target_stop_task(struct se_task
*task
, unsigned long *flags
)
1782 struct se_cmd
*cmd
= task
->task_se_cmd
;
1783 bool was_active
= false;
1785 if (task
->task_flags
& TF_ACTIVE
) {
1786 task
->task_flags
|= TF_REQUEST_STOP
;
1787 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1789 pr_debug("Task %p waiting to complete\n", task
);
1790 del_timer_sync(&task
->task_timer
);
1791 wait_for_completion(&task
->task_stop_comp
);
1792 pr_debug("Task %p stopped successfully\n", task
);
1794 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1795 atomic_dec(&cmd
->t_task_cdbs_left
);
1796 task
->task_flags
&= ~(TF_ACTIVE
| TF_REQUEST_STOP
);
1803 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1805 struct se_task
*task
, *task_tmp
;
1806 unsigned long flags
;
1809 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1810 cmd
->se_tfo
->get_task_tag(cmd
));
1813 * No tasks remain in the execution queue
1815 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1816 list_for_each_entry_safe(task
, task_tmp
,
1817 &cmd
->t_task_list
, t_list
) {
1818 pr_debug("Processing task %p\n", task
);
1820 * If the struct se_task has not been sent and is not active,
1821 * remove the struct se_task from the execution queue.
1823 if (!(task
->task_flags
& (TF_ACTIVE
| TF_SENT
))) {
1824 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1826 transport_remove_task_from_execute_queue(task
,
1829 pr_debug("Task %p removed from execute queue\n", task
);
1830 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1834 if (!target_stop_task(task
, &flags
)) {
1835 pr_debug("Task %p - did nothing\n", task
);
1839 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1845 * Handle SAM-esque emulation for generic transport request failures.
1847 static void transport_generic_request_failure(
1854 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1855 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1856 cmd
->t_task_cdb
[0]);
1857 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
1858 cmd
->se_tfo
->get_cmd_state(cmd
),
1860 cmd
->transport_error_status
);
1861 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1862 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1863 " t_transport_active: %d t_transport_stop: %d"
1864 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1865 atomic_read(&cmd
->t_task_cdbs_left
),
1866 atomic_read(&cmd
->t_task_cdbs_sent
),
1867 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1868 atomic_read(&cmd
->t_transport_active
),
1869 atomic_read(&cmd
->t_transport_stop
),
1870 atomic_read(&cmd
->t_transport_sent
));
1873 * For SAM Task Attribute emulation for failed struct se_cmd
1875 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1876 transport_complete_task_attr(cmd
);
1879 transport_direct_request_timeout(cmd
);
1880 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
1883 switch (cmd
->transport_error_status
) {
1884 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
1885 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1887 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
1888 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
1890 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
1891 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1893 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
1894 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
1896 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
1898 transport_new_cmd_failure(cmd
);
1900 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1901 * we force this session to fall back to session
1904 cmd
->se_tfo
->fall_back_to_erl0(cmd
->se_sess
);
1905 cmd
->se_tfo
->stop_session(cmd
->se_sess
, 0, 0);
1908 case PYX_TRANSPORT_LU_COMM_FAILURE
:
1909 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
1910 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1912 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
1913 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
1915 case PYX_TRANSPORT_WRITE_PROTECTED
:
1916 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
1918 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
1920 * No SENSE Data payload for this case, set SCSI Status
1921 * and queue the response to $FABRIC_MOD.
1923 * Uses linux/include/scsi/scsi.h SAM status codes defs
1925 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1927 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1928 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1931 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1934 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1935 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1936 cmd
->orig_fe_lun
, 0x2C,
1937 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1939 ret
= cmd
->se_tfo
->queue_status(cmd
);
1943 case PYX_TRANSPORT_USE_SENSE_REASON
:
1945 * struct se_cmd->scsi_sense_reason already set
1949 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1951 cmd
->transport_error_status
);
1952 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1956 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1957 * make the call to transport_send_check_condition_and_sense()
1958 * directly. Otherwise expect the fabric to make the call to
1959 * transport_send_check_condition_and_sense() after handling
1960 * possible unsoliticied write data payloads.
1962 if (!sc
&& !cmd
->se_tfo
->new_cmd_map
)
1963 transport_new_cmd_failure(cmd
);
1965 ret
= transport_send_check_condition_and_sense(cmd
,
1966 cmd
->scsi_sense_reason
, 0);
1972 transport_lun_remove_cmd(cmd
);
1973 if (!transport_cmd_check_stop_to_fabric(cmd
))
1978 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1979 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1982 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
1984 unsigned long flags
;
1986 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1987 if (!atomic_read(&cmd
->t_transport_timeout
)) {
1988 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1991 if (atomic_read(&cmd
->t_task_cdbs_timeout_left
)) {
1992 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1996 atomic_sub(atomic_read(&cmd
->t_transport_timeout
),
1998 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2001 static inline u32
transport_lba_21(unsigned char *cdb
)
2003 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2006 static inline u32
transport_lba_32(unsigned char *cdb
)
2008 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2011 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2013 unsigned int __v1
, __v2
;
2015 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2016 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2018 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2022 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2024 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2026 unsigned int __v1
, __v2
;
2028 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2029 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2031 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2034 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2036 unsigned long flags
;
2038 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2039 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2040 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2044 * Called from interrupt context.
2046 static void transport_task_timeout_handler(unsigned long data
)
2048 struct se_task
*task
= (struct se_task
*)data
;
2049 struct se_cmd
*cmd
= task
->task_se_cmd
;
2050 unsigned long flags
;
2052 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2054 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2057 * Determine if transport_complete_task() has already been called.
2059 if (!(task
->task_flags
& TF_ACTIVE
)) {
2060 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2062 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2066 atomic_inc(&cmd
->t_se_count
);
2067 atomic_inc(&cmd
->t_transport_timeout
);
2068 cmd
->t_tasks_failed
= 1;
2070 task
->task_flags
|= TF_TIMEOUT
;
2071 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2072 task
->task_scsi_status
= 1;
2074 if (task
->task_flags
& TF_REQUEST_STOP
) {
2075 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2076 " == 1\n", task
, cmd
);
2077 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2078 complete(&task
->task_stop_comp
);
2082 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
2083 pr_debug("transport task: %p cmd: %p timeout non zero"
2084 " t_task_cdbs_left\n", task
, cmd
);
2085 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2088 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2091 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
2092 cmd
->t_state
= TRANSPORT_COMPLETE
;
2093 atomic_set(&cmd
->t_transport_active
, 1);
2094 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2096 queue_work(target_completion_wq
, &cmd
->work
);
2099 static void transport_start_task_timer(struct se_task
*task
)
2101 struct se_device
*dev
= task
->task_se_cmd
->se_dev
;
2105 * If the task_timeout is disabled, exit now.
2107 timeout
= dev
->se_sub_dev
->se_dev_attrib
.task_timeout
;
2111 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2112 task
->task_timer
.data
= (unsigned long) task
;
2113 task
->task_timer
.function
= transport_task_timeout_handler
;
2114 add_timer(&task
->task_timer
);
2117 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2119 if (dev
->dev_tcq_window_closed
++ <
2120 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2121 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2123 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2125 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
2130 * Called from Fabric Module context from transport_execute_tasks()
2132 * The return of this function determins if the tasks from struct se_cmd
2133 * get added to the execution queue in transport_execute_tasks(),
2134 * or are added to the delayed or ordered lists here.
2136 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2138 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2141 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2142 * to allow the passed struct se_cmd list of tasks to the front of the list.
2144 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2145 atomic_inc(&cmd
->se_dev
->dev_hoq_count
);
2146 smp_mb__after_atomic_inc();
2147 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2148 " 0x%02x, se_ordered_id: %u\n",
2150 cmd
->se_ordered_id
);
2152 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2153 spin_lock(&cmd
->se_dev
->ordered_cmd_lock
);
2154 list_add_tail(&cmd
->se_ordered_node
,
2155 &cmd
->se_dev
->ordered_cmd_list
);
2156 spin_unlock(&cmd
->se_dev
->ordered_cmd_lock
);
2158 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2159 smp_mb__after_atomic_inc();
2161 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2162 " list, se_ordered_id: %u\n",
2164 cmd
->se_ordered_id
);
2166 * Add ORDERED command to tail of execution queue if
2167 * no other older commands exist that need to be
2170 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2174 * For SIMPLE and UNTAGGED Task Attribute commands
2176 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2177 smp_mb__after_atomic_inc();
2180 * Otherwise if one or more outstanding ORDERED task attribute exist,
2181 * add the dormant task(s) built for the passed struct se_cmd to the
2182 * execution queue and become in Active state for this struct se_device.
2184 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2186 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2187 * will be drained upon completion of HEAD_OF_QUEUE task.
2189 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2190 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2191 list_add_tail(&cmd
->se_delayed_node
,
2192 &cmd
->se_dev
->delayed_cmd_list
);
2193 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2195 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2196 " delayed CMD list, se_ordered_id: %u\n",
2197 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2198 cmd
->se_ordered_id
);
2200 * Return zero to let transport_execute_tasks() know
2201 * not to add the delayed tasks to the execution list.
2206 * Otherwise, no ORDERED task attributes exist..
2212 * Called from fabric module context in transport_generic_new_cmd() and
2213 * transport_generic_process_write()
2215 static int transport_execute_tasks(struct se_cmd
*cmd
)
2219 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2220 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2221 transport_generic_request_failure(cmd
, 0, 1);
2226 * Call transport_cmd_check_stop() to see if a fabric exception
2227 * has occurred that prevents execution.
2229 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2231 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2232 * attribute for the tasks of the received struct se_cmd CDB
2234 add_tasks
= transport_execute_task_attr(cmd
);
2238 * This calls transport_add_tasks_from_cmd() to handle
2239 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2240 * (if enabled) in __transport_add_task_to_execute_queue() and
2241 * transport_add_task_check_sam_attr().
2243 transport_add_tasks_from_cmd(cmd
);
2246 * Kick the execution queue for the cmd associated struct se_device
2250 __transport_execute_tasks(cmd
->se_dev
);
2255 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2256 * from struct se_device->execute_task_list and
2258 * Called from transport_processing_thread()
2260 static int __transport_execute_tasks(struct se_device
*dev
)
2263 struct se_cmd
*cmd
= NULL
;
2264 struct se_task
*task
= NULL
;
2265 unsigned long flags
;
2268 * Check if there is enough room in the device and HBA queue to send
2269 * struct se_tasks to the selected transport.
2272 if (!atomic_read(&dev
->depth_left
))
2273 return transport_tcq_window_closed(dev
);
2275 dev
->dev_tcq_window_closed
= 0;
2277 spin_lock_irq(&dev
->execute_task_lock
);
2278 if (list_empty(&dev
->execute_task_list
)) {
2279 spin_unlock_irq(&dev
->execute_task_lock
);
2282 task
= list_first_entry(&dev
->execute_task_list
,
2283 struct se_task
, t_execute_list
);
2284 __transport_remove_task_from_execute_queue(task
, dev
);
2285 spin_unlock_irq(&dev
->execute_task_lock
);
2287 atomic_dec(&dev
->depth_left
);
2289 cmd
= task
->task_se_cmd
;
2291 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2292 task
->task_flags
|= (TF_ACTIVE
| TF_SENT
);
2293 atomic_inc(&cmd
->t_task_cdbs_sent
);
2295 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2296 cmd
->t_task_list_num
)
2297 atomic_set(&cmd
->transport_sent
, 1);
2299 transport_start_task_timer(task
);
2300 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2302 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2303 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2304 * struct se_subsystem_api->do_task() caller below.
2306 if (cmd
->transport_emulate_cdb
) {
2307 error
= cmd
->transport_emulate_cdb(cmd
);
2309 cmd
->transport_error_status
= error
;
2310 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2311 task
->task_flags
&= ~TF_ACTIVE
;
2312 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2313 del_timer_sync(&task
->task_timer
);
2314 atomic_set(&cmd
->transport_sent
, 0);
2315 transport_stop_tasks_for_cmd(cmd
);
2316 atomic_inc(&dev
->depth_left
);
2317 transport_generic_request_failure(cmd
, 0, 1);
2321 * Handle the successful completion for transport_emulate_cdb()
2322 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2323 * Otherwise the caller is expected to complete the task with
2326 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2327 cmd
->scsi_status
= SAM_STAT_GOOD
;
2328 task
->task_scsi_status
= GOOD
;
2329 transport_complete_task(task
, 1);
2333 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2334 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2335 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2336 * LUN emulation code.
2338 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2339 * call ->do_task() directly and let the underlying TCM subsystem plugin
2340 * code handle the CDB emulation.
2342 if ((dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2343 (!(task
->task_se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2344 error
= transport_emulate_control_cdb(task
);
2346 error
= dev
->transport
->do_task(task
);
2349 cmd
->transport_error_status
= error
;
2350 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2351 task
->task_flags
&= ~TF_ACTIVE
;
2352 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2353 del_timer_sync(&task
->task_timer
);
2354 atomic_set(&cmd
->transport_sent
, 0);
2355 transport_stop_tasks_for_cmd(cmd
);
2356 atomic_inc(&dev
->depth_left
);
2357 transport_generic_request_failure(cmd
, 0, 1);
2366 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2368 unsigned long flags
;
2370 * Any unsolicited data will get dumped for failed command inside of
2373 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2374 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2375 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2376 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2379 static inline u32
transport_get_sectors_6(
2384 struct se_device
*dev
= cmd
->se_dev
;
2387 * Assume TYPE_DISK for non struct se_device objects.
2388 * Use 8-bit sector value.
2394 * Use 24-bit allocation length for TYPE_TAPE.
2396 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2397 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2400 * Everything else assume TYPE_DISK Sector CDB location.
2401 * Use 8-bit sector value.
2407 static inline u32
transport_get_sectors_10(
2412 struct se_device
*dev
= cmd
->se_dev
;
2415 * Assume TYPE_DISK for non struct se_device objects.
2416 * Use 16-bit sector value.
2422 * XXX_10 is not defined in SSC, throw an exception
2424 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2430 * Everything else assume TYPE_DISK Sector CDB location.
2431 * Use 16-bit sector value.
2434 return (u32
)(cdb
[7] << 8) + cdb
[8];
2437 static inline u32
transport_get_sectors_12(
2442 struct se_device
*dev
= cmd
->se_dev
;
2445 * Assume TYPE_DISK for non struct se_device objects.
2446 * Use 32-bit sector value.
2452 * XXX_12 is not defined in SSC, throw an exception
2454 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2460 * Everything else assume TYPE_DISK Sector CDB location.
2461 * Use 32-bit sector value.
2464 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2467 static inline u32
transport_get_sectors_16(
2472 struct se_device
*dev
= cmd
->se_dev
;
2475 * Assume TYPE_DISK for non struct se_device objects.
2476 * Use 32-bit sector value.
2482 * Use 24-bit allocation length for TYPE_TAPE.
2484 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2485 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2488 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2489 (cdb
[12] << 8) + cdb
[13];
2493 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2495 static inline u32
transport_get_sectors_32(
2501 * Assume TYPE_DISK for non struct se_device objects.
2502 * Use 32-bit sector value.
2504 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2505 (cdb
[30] << 8) + cdb
[31];
2509 static inline u32
transport_get_size(
2514 struct se_device
*dev
= cmd
->se_dev
;
2516 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2517 if (cdb
[1] & 1) { /* sectors */
2518 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2523 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2524 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2525 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2526 dev
->transport
->name
);
2528 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2531 static void transport_xor_callback(struct se_cmd
*cmd
)
2533 unsigned char *buf
, *addr
;
2534 struct scatterlist
*sg
;
2535 unsigned int offset
;
2539 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2541 * 1) read the specified logical block(s);
2542 * 2) transfer logical blocks from the data-out buffer;
2543 * 3) XOR the logical blocks transferred from the data-out buffer with
2544 * the logical blocks read, storing the resulting XOR data in a buffer;
2545 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2546 * blocks transferred from the data-out buffer; and
2547 * 5) transfer the resulting XOR data to the data-in buffer.
2549 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2551 pr_err("Unable to allocate xor_callback buf\n");
2555 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2556 * into the locally allocated *buf
2558 sg_copy_to_buffer(cmd
->t_data_sg
,
2564 * Now perform the XOR against the BIDI read memory located at
2565 * cmd->t_mem_bidi_list
2569 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2570 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2574 for (i
= 0; i
< sg
->length
; i
++)
2575 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2577 offset
+= sg
->length
;
2578 kunmap_atomic(addr
, KM_USER0
);
2586 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2588 static int transport_get_sense_data(struct se_cmd
*cmd
)
2590 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2591 struct se_device
*dev
= cmd
->se_dev
;
2592 struct se_task
*task
= NULL
, *task_tmp
;
2593 unsigned long flags
;
2596 WARN_ON(!cmd
->se_lun
);
2601 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2602 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2603 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2607 list_for_each_entry_safe(task
, task_tmp
,
2608 &cmd
->t_task_list
, t_list
) {
2609 if (!task
->task_sense
)
2612 if (!dev
->transport
->get_sense_buffer
) {
2613 pr_err("dev->transport->get_sense_buffer"
2618 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2619 if (!sense_buffer
) {
2620 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2621 " sense buffer for task with sense\n",
2622 cmd
->se_tfo
->get_task_tag(cmd
), task
);
2625 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2627 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2628 TRANSPORT_SENSE_BUFFER
);
2630 memcpy(&buffer
[offset
], sense_buffer
,
2631 TRANSPORT_SENSE_BUFFER
);
2632 cmd
->scsi_status
= task
->task_scsi_status
;
2633 /* Automatically padded */
2634 cmd
->scsi_sense_length
=
2635 (TRANSPORT_SENSE_BUFFER
+ offset
);
2637 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2639 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2643 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2649 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
2651 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2652 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2653 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2655 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2656 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2659 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2662 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2663 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2664 cmd
->orig_fe_lun
, 0x2C,
2665 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2669 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2671 return dev
->transport
->get_blocks(dev
) + 1;
2674 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2676 struct se_device
*dev
= cmd
->se_dev
;
2679 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2682 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2684 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2685 pr_err("LBA: %llu Sectors: %u exceeds"
2686 " transport_dev_end_lba(): %llu\n",
2687 cmd
->t_task_lba
, sectors
,
2688 transport_dev_end_lba(dev
));
2695 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2698 * Determine if the received WRITE_SAME is used to for direct
2699 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2700 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2701 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2703 int passthrough
= (dev
->transport
->transport_type
==
2704 TRANSPORT_PLUGIN_PHBA_PDEV
);
2707 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2708 pr_err("WRITE_SAME PBDATA and LBDATA"
2709 " bits not supported for Block Discard"
2714 * Currently for the emulated case we only accept
2715 * tpws with the UNMAP=1 bit set.
2717 if (!(flags
[0] & 0x08)) {
2718 pr_err("WRITE_SAME w/o UNMAP bit not"
2719 " supported for Block Discard Emulation\n");
2727 /* transport_generic_cmd_sequencer():
2729 * Generic Command Sequencer that should work for most DAS transport
2732 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2735 * FIXME: Need to support other SCSI OPCODES where as well.
2737 static int transport_generic_cmd_sequencer(
2741 struct se_device
*dev
= cmd
->se_dev
;
2742 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2743 int ret
= 0, sector_ret
= 0, passthrough
;
2744 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2748 * Check for an existing UNIT ATTENTION condition
2750 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2751 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2752 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2756 * Check status of Asymmetric Logical Unit Assignment port
2758 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2761 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2762 * The ALUA additional sense code qualifier (ASCQ) is determined
2763 * by the ALUA primary or secondary access state..
2767 pr_debug("[%s]: ALUA TG Port not available,"
2768 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2769 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2771 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2772 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2773 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2776 goto out_invalid_cdb_field
;
2779 * Check status for SPC-3 Persistent Reservations
2781 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2782 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2783 cmd
, cdb
, pr_reg_type
) != 0)
2784 return transport_handle_reservation_conflict(cmd
);
2786 * This means the CDB is allowed for the SCSI Initiator port
2787 * when said port is *NOT* holding the legacy SPC-2 or
2788 * SPC-3 Persistent Reservation.
2794 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2796 goto out_unsupported_cdb
;
2797 size
= transport_get_size(sectors
, cdb
, cmd
);
2798 cmd
->t_task_lba
= transport_lba_21(cdb
);
2799 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2802 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2804 goto out_unsupported_cdb
;
2805 size
= transport_get_size(sectors
, cdb
, cmd
);
2806 cmd
->t_task_lba
= transport_lba_32(cdb
);
2807 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2810 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2812 goto out_unsupported_cdb
;
2813 size
= transport_get_size(sectors
, cdb
, cmd
);
2814 cmd
->t_task_lba
= transport_lba_32(cdb
);
2815 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2818 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2820 goto out_unsupported_cdb
;
2821 size
= transport_get_size(sectors
, cdb
, cmd
);
2822 cmd
->t_task_lba
= transport_lba_64(cdb
);
2823 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2826 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2828 goto out_unsupported_cdb
;
2829 size
= transport_get_size(sectors
, cdb
, cmd
);
2830 cmd
->t_task_lba
= transport_lba_21(cdb
);
2831 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2834 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2836 goto out_unsupported_cdb
;
2837 size
= transport_get_size(sectors
, cdb
, cmd
);
2838 cmd
->t_task_lba
= transport_lba_32(cdb
);
2839 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2840 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2843 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2845 goto out_unsupported_cdb
;
2846 size
= transport_get_size(sectors
, cdb
, cmd
);
2847 cmd
->t_task_lba
= transport_lba_32(cdb
);
2848 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2849 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2852 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2854 goto out_unsupported_cdb
;
2855 size
= transport_get_size(sectors
, cdb
, cmd
);
2856 cmd
->t_task_lba
= transport_lba_64(cdb
);
2857 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2858 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2860 case XDWRITEREAD_10
:
2861 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2862 !(cmd
->t_tasks_bidi
))
2863 goto out_invalid_cdb_field
;
2864 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2866 goto out_unsupported_cdb
;
2867 size
= transport_get_size(sectors
, cdb
, cmd
);
2868 cmd
->t_task_lba
= transport_lba_32(cdb
);
2869 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2871 if (dev
->transport
->transport_type
==
2872 TRANSPORT_PLUGIN_PHBA_PDEV
)
2873 goto out_unsupported_cdb
;
2875 * Setup BIDI XOR callback to be run after I/O completion.
2877 cmd
->transport_complete_callback
= &transport_xor_callback
;
2878 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2880 case VARIABLE_LENGTH_CMD
:
2881 service_action
= get_unaligned_be16(&cdb
[8]);
2883 * Determine if this is TCM/PSCSI device and we should disable
2884 * internal emulation for this CDB.
2886 passthrough
= (dev
->transport
->transport_type
==
2887 TRANSPORT_PLUGIN_PHBA_PDEV
);
2889 switch (service_action
) {
2890 case XDWRITEREAD_32
:
2891 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2893 goto out_unsupported_cdb
;
2894 size
= transport_get_size(sectors
, cdb
, cmd
);
2896 * Use WRITE_32 and READ_32 opcodes for the emulated
2897 * XDWRITE_READ_32 logic.
2899 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2900 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2903 goto out_unsupported_cdb
;
2905 * Setup BIDI XOR callback to be run during after I/O
2908 cmd
->transport_complete_callback
= &transport_xor_callback
;
2909 cmd
->t_tasks_fua
= (cdb
[10] & 0x8);
2912 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2914 goto out_unsupported_cdb
;
2917 size
= transport_get_size(1, cdb
, cmd
);
2919 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2921 goto out_invalid_cdb_field
;
2924 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2925 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2927 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2928 goto out_invalid_cdb_field
;
2932 pr_err("VARIABLE_LENGTH_CMD service action"
2933 " 0x%04x not supported\n", service_action
);
2934 goto out_unsupported_cdb
;
2937 case MAINTENANCE_IN
:
2938 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2939 /* MAINTENANCE_IN from SCC-2 */
2941 * Check for emulated MI_REPORT_TARGET_PGS.
2943 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
2944 cmd
->transport_emulate_cdb
=
2945 (su_dev
->t10_alua
.alua_type
==
2946 SPC3_ALUA_EMULATED
) ?
2947 core_emulate_report_target_port_groups
:
2950 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2951 (cdb
[8] << 8) | cdb
[9];
2953 /* GPCMD_SEND_KEY from multi media commands */
2954 size
= (cdb
[8] << 8) + cdb
[9];
2956 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2960 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2962 case MODE_SELECT_10
:
2963 size
= (cdb
[7] << 8) + cdb
[8];
2964 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2968 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2971 case GPCMD_READ_BUFFER_CAPACITY
:
2972 case GPCMD_SEND_OPC
:
2975 size
= (cdb
[7] << 8) + cdb
[8];
2976 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2978 case READ_BLOCK_LIMITS
:
2979 size
= READ_BLOCK_LEN
;
2980 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2982 case GPCMD_GET_CONFIGURATION
:
2983 case GPCMD_READ_FORMAT_CAPACITIES
:
2984 case GPCMD_READ_DISC_INFO
:
2985 case GPCMD_READ_TRACK_RZONE_INFO
:
2986 size
= (cdb
[7] << 8) + cdb
[8];
2987 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2989 case PERSISTENT_RESERVE_IN
:
2990 case PERSISTENT_RESERVE_OUT
:
2991 cmd
->transport_emulate_cdb
=
2992 (su_dev
->t10_pr
.res_type
==
2993 SPC3_PERSISTENT_RESERVATIONS
) ?
2994 core_scsi3_emulate_pr
: NULL
;
2995 size
= (cdb
[7] << 8) + cdb
[8];
2996 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2998 case GPCMD_MECHANISM_STATUS
:
2999 case GPCMD_READ_DVD_STRUCTURE
:
3000 size
= (cdb
[8] << 8) + cdb
[9];
3001 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3004 size
= READ_POSITION_LEN
;
3005 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3007 case MAINTENANCE_OUT
:
3008 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3009 /* MAINTENANCE_OUT from SCC-2
3011 * Check for emulated MO_SET_TARGET_PGS.
3013 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3014 cmd
->transport_emulate_cdb
=
3015 (su_dev
->t10_alua
.alua_type
==
3016 SPC3_ALUA_EMULATED
) ?
3017 core_emulate_set_target_port_groups
:
3021 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3022 (cdb
[8] << 8) | cdb
[9];
3024 /* GPCMD_REPORT_KEY from multi media commands */
3025 size
= (cdb
[8] << 8) + cdb
[9];
3027 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3030 size
= (cdb
[3] << 8) + cdb
[4];
3032 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3033 * See spc4r17 section 5.3
3035 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3036 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3037 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3040 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3041 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3044 size
= READ_CAP_LEN
;
3045 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3047 case READ_MEDIA_SERIAL_NUMBER
:
3048 case SECURITY_PROTOCOL_IN
:
3049 case SECURITY_PROTOCOL_OUT
:
3050 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3051 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3053 case SERVICE_ACTION_IN
:
3054 case ACCESS_CONTROL_IN
:
3055 case ACCESS_CONTROL_OUT
:
3057 case READ_ATTRIBUTE
:
3058 case RECEIVE_COPY_RESULTS
:
3059 case WRITE_ATTRIBUTE
:
3060 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3061 (cdb
[12] << 8) | cdb
[13];
3062 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3064 case RECEIVE_DIAGNOSTIC
:
3065 case SEND_DIAGNOSTIC
:
3066 size
= (cdb
[3] << 8) | cdb
[4];
3067 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3069 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3072 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3073 size
= (2336 * sectors
);
3074 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3079 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3083 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3085 case READ_ELEMENT_STATUS
:
3086 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3087 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3090 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3091 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3096 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3097 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3099 if (cdb
[0] == RESERVE_10
)
3100 size
= (cdb
[7] << 8) | cdb
[8];
3102 size
= cmd
->data_length
;
3105 * Setup the legacy emulated handler for SPC-2 and
3106 * >= SPC-3 compatible reservation handling (CRH=1)
3107 * Otherwise, we assume the underlying SCSI logic is
3108 * is running in SPC_PASSTHROUGH, and wants reservations
3109 * emulation disabled.
3111 cmd
->transport_emulate_cdb
=
3112 (su_dev
->t10_pr
.res_type
!=
3114 core_scsi2_emulate_crh
: NULL
;
3115 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3120 * The SPC-2 RELEASE 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] == RELEASE_10
)
3124 size
= (cdb
[7] << 8) | cdb
[8];
3126 size
= cmd
->data_length
;
3128 cmd
->transport_emulate_cdb
=
3129 (su_dev
->t10_pr
.res_type
!=
3131 core_scsi2_emulate_crh
: NULL
;
3132 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3134 case SYNCHRONIZE_CACHE
:
3135 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3137 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3139 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3140 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3141 cmd
->t_task_lba
= transport_lba_32(cdb
);
3143 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3144 cmd
->t_task_lba
= transport_lba_64(cdb
);
3147 goto out_unsupported_cdb
;
3149 size
= transport_get_size(sectors
, cdb
, cmd
);
3150 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3153 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3155 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3158 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3159 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3161 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3163 * Check to ensure that LBA + Range does not exceed past end of
3164 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3166 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
3167 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3168 goto out_invalid_cdb_field
;
3172 size
= get_unaligned_be16(&cdb
[7]);
3173 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3176 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3178 goto out_unsupported_cdb
;
3181 size
= transport_get_size(1, cdb
, cmd
);
3183 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3184 goto out_invalid_cdb_field
;
3187 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
3188 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3190 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3191 goto out_invalid_cdb_field
;
3194 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3196 goto out_unsupported_cdb
;
3199 size
= transport_get_size(1, cdb
, cmd
);
3201 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3202 goto out_invalid_cdb_field
;
3205 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3206 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3208 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3209 * of byte 1 bit 3 UNMAP instead of original reserved field
3211 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3212 goto out_invalid_cdb_field
;
3214 case ALLOW_MEDIUM_REMOVAL
:
3215 case GPCMD_CLOSE_TRACK
:
3217 case INITIALIZE_ELEMENT_STATUS
:
3218 case GPCMD_LOAD_UNLOAD
:
3221 case GPCMD_SET_SPEED
:
3224 case TEST_UNIT_READY
:
3226 case WRITE_FILEMARKS
:
3228 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3231 cmd
->transport_emulate_cdb
=
3232 transport_core_report_lun_response
;
3233 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3235 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3236 * See spc4r17 section 5.3
3238 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3239 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3240 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3243 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3244 " 0x%02x, sending CHECK_CONDITION.\n",
3245 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3246 goto out_unsupported_cdb
;
3249 if (size
!= cmd
->data_length
) {
3250 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3251 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3252 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3253 cmd
->data_length
, size
, cdb
[0]);
3255 cmd
->cmd_spdtl
= size
;
3257 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3258 pr_err("Rejecting underflow/overflow"
3260 goto out_invalid_cdb_field
;
3263 * Reject READ_* or WRITE_* with overflow/underflow for
3264 * type SCF_SCSI_DATA_SG_IO_CDB.
3266 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3267 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3268 " CDB on non 512-byte sector setup subsystem"
3269 " plugin: %s\n", dev
->transport
->name
);
3270 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3271 goto out_invalid_cdb_field
;
3274 if (size
> cmd
->data_length
) {
3275 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3276 cmd
->residual_count
= (size
- cmd
->data_length
);
3278 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3279 cmd
->residual_count
= (cmd
->data_length
- size
);
3281 cmd
->data_length
= size
;
3284 /* Let's limit control cdbs to a page, for simplicity's sake. */
3285 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3287 goto out_invalid_cdb_field
;
3289 transport_set_supported_SAM_opcode(cmd
);
3292 out_unsupported_cdb
:
3293 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3294 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3296 out_invalid_cdb_field
:
3297 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3298 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3303 * Called from I/O completion to determine which dormant/delayed
3304 * and ordered cmds need to have their tasks added to the execution queue.
3306 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3308 struct se_device
*dev
= cmd
->se_dev
;
3309 struct se_cmd
*cmd_p
, *cmd_tmp
;
3310 int new_active_tasks
= 0;
3312 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3313 atomic_dec(&dev
->simple_cmds
);
3314 smp_mb__after_atomic_dec();
3315 dev
->dev_cur_ordered_id
++;
3316 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3317 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3318 cmd
->se_ordered_id
);
3319 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3320 atomic_dec(&dev
->dev_hoq_count
);
3321 smp_mb__after_atomic_dec();
3322 dev
->dev_cur_ordered_id
++;
3323 pr_debug("Incremented dev_cur_ordered_id: %u for"
3324 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3325 cmd
->se_ordered_id
);
3326 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3327 spin_lock(&dev
->ordered_cmd_lock
);
3328 list_del(&cmd
->se_ordered_node
);
3329 atomic_dec(&dev
->dev_ordered_sync
);
3330 smp_mb__after_atomic_dec();
3331 spin_unlock(&dev
->ordered_cmd_lock
);
3333 dev
->dev_cur_ordered_id
++;
3334 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3335 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3338 * Process all commands up to the last received
3339 * ORDERED task attribute which requires another blocking
3342 spin_lock(&dev
->delayed_cmd_lock
);
3343 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3344 &dev
->delayed_cmd_list
, se_delayed_node
) {
3346 list_del(&cmd_p
->se_delayed_node
);
3347 spin_unlock(&dev
->delayed_cmd_lock
);
3349 pr_debug("Calling add_tasks() for"
3350 " cmd_p: 0x%02x Task Attr: 0x%02x"
3351 " Dormant -> Active, se_ordered_id: %u\n",
3352 cmd_p
->t_task_cdb
[0],
3353 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3355 transport_add_tasks_from_cmd(cmd_p
);
3358 spin_lock(&dev
->delayed_cmd_lock
);
3359 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3362 spin_unlock(&dev
->delayed_cmd_lock
);
3364 * If new tasks have become active, wake up the transport thread
3365 * to do the processing of the Active tasks.
3367 if (new_active_tasks
!= 0)
3368 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3371 static void transport_complete_qf(struct se_cmd
*cmd
)
3375 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3376 transport_complete_task_attr(cmd
);
3378 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3379 ret
= cmd
->se_tfo
->queue_status(cmd
);
3384 switch (cmd
->data_direction
) {
3385 case DMA_FROM_DEVICE
:
3386 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3389 if (cmd
->t_bidi_data_sg
) {
3390 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3394 /* Fall through for DMA_TO_DEVICE */
3396 ret
= cmd
->se_tfo
->queue_status(cmd
);
3404 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3407 transport_lun_remove_cmd(cmd
);
3408 transport_cmd_check_stop_to_fabric(cmd
);
3411 static void transport_handle_queue_full(
3413 struct se_device
*dev
)
3415 spin_lock_irq(&dev
->qf_cmd_lock
);
3416 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3417 atomic_inc(&dev
->dev_qf_count
);
3418 smp_mb__after_atomic_inc();
3419 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3421 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3424 static void target_complete_ok_work(struct work_struct
*work
)
3426 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3427 int reason
= 0, ret
;
3430 * Check if we need to move delayed/dormant tasks from cmds on the
3431 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3434 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3435 transport_complete_task_attr(cmd
);
3437 * Check to schedule QUEUE_FULL work, or execute an existing
3438 * cmd->transport_qf_callback()
3440 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3441 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3444 * Check if we need to retrieve a sense buffer from
3445 * the struct se_cmd in question.
3447 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3448 if (transport_get_sense_data(cmd
) < 0)
3449 reason
= TCM_NON_EXISTENT_LUN
;
3452 * Only set when an struct se_task->task_scsi_status returned
3453 * a non GOOD status.
3455 if (cmd
->scsi_status
) {
3456 ret
= transport_send_check_condition_and_sense(
3461 transport_lun_remove_cmd(cmd
);
3462 transport_cmd_check_stop_to_fabric(cmd
);
3467 * Check for a callback, used by amongst other things
3468 * XDWRITE_READ_10 emulation.
3470 if (cmd
->transport_complete_callback
)
3471 cmd
->transport_complete_callback(cmd
);
3473 switch (cmd
->data_direction
) {
3474 case DMA_FROM_DEVICE
:
3475 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3476 if (cmd
->se_lun
->lun_sep
) {
3477 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3480 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3482 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3487 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3488 if (cmd
->se_lun
->lun_sep
) {
3489 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3492 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3494 * Check if we need to send READ payload for BIDI-COMMAND
3496 if (cmd
->t_bidi_data_sg
) {
3497 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3498 if (cmd
->se_lun
->lun_sep
) {
3499 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3502 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3503 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3508 /* Fall through for DMA_TO_DEVICE */
3510 ret
= cmd
->se_tfo
->queue_status(cmd
);
3518 transport_lun_remove_cmd(cmd
);
3519 transport_cmd_check_stop_to_fabric(cmd
);
3523 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3524 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3525 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3526 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3529 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3531 struct se_task
*task
, *task_tmp
;
3532 unsigned long flags
;
3533 LIST_HEAD(dispose_list
);
3535 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3536 list_for_each_entry_safe(task
, task_tmp
,
3537 &cmd
->t_task_list
, t_list
) {
3538 if (!(task
->task_flags
& TF_ACTIVE
))
3539 list_move_tail(&task
->t_list
, &dispose_list
);
3541 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3543 while (!list_empty(&dispose_list
)) {
3544 task
= list_first_entry(&dispose_list
, struct se_task
, t_list
);
3547 * We already cancelled all pending timers in
3548 * transport_complete_task, but that was just a pure del_timer,
3549 * so do a full del_timer_sync here to make sure any handler
3550 * that was running at that point has finished execution.
3552 del_timer_sync(&task
->task_timer
);
3554 kfree(task
->task_sg
);
3556 list_del(&task
->t_list
);
3558 cmd
->se_dev
->transport
->free_task(task
);
3562 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3564 struct scatterlist
*sg
;
3567 for_each_sg(sgl
, sg
, nents
, count
)
3568 __free_page(sg_page(sg
));
3573 static inline void transport_free_pages(struct se_cmd
*cmd
)
3575 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3578 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3579 cmd
->t_data_sg
= NULL
;
3580 cmd
->t_data_nents
= 0;
3582 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3583 cmd
->t_bidi_data_sg
= NULL
;
3584 cmd
->t_bidi_data_nents
= 0;
3588 * transport_put_cmd - release a reference to a command
3589 * @cmd: command to release
3591 * This routine releases our reference to the command and frees it if possible.
3593 static void transport_put_cmd(struct se_cmd
*cmd
)
3595 unsigned long flags
;
3598 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3599 if (atomic_read(&cmd
->t_fe_count
)) {
3600 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3604 if (atomic_read(&cmd
->t_se_count
)) {
3605 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3609 if (atomic_read(&cmd
->transport_dev_active
)) {
3610 atomic_set(&cmd
->transport_dev_active
, 0);
3611 transport_all_task_dev_remove_state(cmd
);
3614 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3616 if (free_tasks
!= 0)
3617 transport_free_dev_tasks(cmd
);
3619 transport_free_pages(cmd
);
3620 transport_release_cmd(cmd
);
3623 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3627 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3628 * allocating in the core.
3629 * @cmd: Associated se_cmd descriptor
3630 * @mem: SGL style memory for TCM WRITE / READ
3631 * @sg_mem_num: Number of SGL elements
3632 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3633 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3635 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3638 int transport_generic_map_mem_to_cmd(
3640 struct scatterlist
*sgl
,
3642 struct scatterlist
*sgl_bidi
,
3645 if (!sgl
|| !sgl_count
)
3648 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3649 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3651 cmd
->t_data_sg
= sgl
;
3652 cmd
->t_data_nents
= sgl_count
;
3654 if (sgl_bidi
&& sgl_bidi_count
) {
3655 cmd
->t_bidi_data_sg
= sgl_bidi
;
3656 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3658 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3663 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3665 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3667 struct scatterlist
*sg
= cmd
->t_data_sg
;
3671 * We need to take into account a possible offset here for fabrics like
3672 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3673 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3675 return kmap(sg_page(sg
)) + sg
->offset
;
3677 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3679 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3681 kunmap(sg_page(cmd
->t_data_sg
));
3683 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3686 transport_generic_get_mem(struct se_cmd
*cmd
)
3688 u32 length
= cmd
->data_length
;
3693 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3694 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3695 if (!cmd
->t_data_sg
)
3698 cmd
->t_data_nents
= nents
;
3699 sg_init_table(cmd
->t_data_sg
, nents
);
3702 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3703 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3707 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3715 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3718 kfree(cmd
->t_data_sg
);
3719 cmd
->t_data_sg
= NULL
;
3723 /* Reduce sectors if they are too long for the device */
3724 static inline sector_t
transport_limit_task_sectors(
3725 struct se_device
*dev
,
3726 unsigned long long lba
,
3729 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3731 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3732 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3733 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3740 * This function can be used by HW target mode drivers to create a linked
3741 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3742 * This is intended to be called during the completion path by TCM Core
3743 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3745 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3747 struct scatterlist
*sg_first
= NULL
;
3748 struct scatterlist
*sg_prev
= NULL
;
3749 int sg_prev_nents
= 0;
3750 struct scatterlist
*sg
;
3751 struct se_task
*task
;
3752 u32 chained_nents
= 0;
3755 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3758 * Walk the struct se_task list and setup scatterlist chains
3759 * for each contiguously allocated struct se_task->task_sg[].
3761 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3766 sg_first
= task
->task_sg
;
3767 chained_nents
= task
->task_sg_nents
;
3769 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3770 chained_nents
+= task
->task_sg_nents
;
3773 * For the padded tasks, use the extra SGL vector allocated
3774 * in transport_allocate_data_tasks() for the sg_prev_nents
3775 * offset into sg_chain() above.
3777 * We do not need the padding for the last task (or a single
3778 * task), but in that case we will never use the sg_prev_nents
3779 * value below which would be incorrect.
3781 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3782 sg_prev
= task
->task_sg
;
3785 * Setup the starting pointer and total t_tasks_sg_linked_no including
3786 * padding SGs for linking and to mark the end.
3788 cmd
->t_tasks_sg_chained
= sg_first
;
3789 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3791 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3792 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3793 cmd
->t_tasks_sg_chained_no
);
3795 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
3796 cmd
->t_tasks_sg_chained_no
, i
) {
3798 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3799 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
3800 if (sg_is_chain(sg
))
3801 pr_debug("SG: %p sg_is_chain=1\n", sg
);
3803 pr_debug("SG: %p sg_is_last=1\n", sg
);
3806 EXPORT_SYMBOL(transport_do_task_sg_chain
);
3809 * Break up cmd into chunks transport can handle
3812 transport_allocate_data_tasks(struct se_cmd
*cmd
,
3813 enum dma_data_direction data_direction
,
3814 struct scatterlist
*cmd_sg
, unsigned int sgl_nents
)
3816 struct se_device
*dev
= cmd
->se_dev
;
3818 unsigned long long lba
;
3819 sector_t sectors
, dev_max_sectors
;
3822 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3825 dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
3826 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
3828 WARN_ON(cmd
->data_length
% sector_size
);
3830 lba
= cmd
->t_task_lba
;
3831 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
3832 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
3834 for (i
= 0; i
< task_count
; i
++) {
3835 struct se_task
*task
;
3836 unsigned int task_size
, task_sg_nents_padded
;
3837 struct scatterlist
*sg
;
3838 unsigned long flags
;
3841 task
= transport_generic_get_task(cmd
, data_direction
);
3845 task
->task_lba
= lba
;
3846 task
->task_sectors
= min(sectors
, dev_max_sectors
);
3847 task
->task_size
= task
->task_sectors
* sector_size
;
3850 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3851 * in order to calculate the number per task SGL entries
3853 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
3855 * Check if the fabric module driver is requesting that all
3856 * struct se_task->task_sg[] be chained together.. If so,
3857 * then allocate an extra padding SG entry for linking and
3858 * marking the end of the chained SGL for every task except
3859 * the last one for (task_count > 1) operation, or skipping
3860 * the extra padding for the (task_count == 1) case.
3862 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
3863 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
3865 task_sg_nents_padded
= task
->task_sg_nents
;
3867 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
3868 task_sg_nents_padded
, GFP_KERNEL
);
3869 if (!task
->task_sg
) {
3870 cmd
->se_dev
->transport
->free_task(task
);
3874 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
3876 task_size
= task
->task_size
;
3878 /* Build new sgl, only up to task_size */
3879 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
3880 if (cmd_sg
->length
> task_size
)
3884 task_size
-= cmd_sg
->length
;
3885 cmd_sg
= sg_next(cmd_sg
);
3888 lba
+= task
->task_sectors
;
3889 sectors
-= task
->task_sectors
;
3891 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3892 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3893 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3900 transport_allocate_control_task(struct se_cmd
*cmd
)
3902 struct se_task
*task
;
3903 unsigned long flags
;
3905 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
3909 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
3911 if (!task
->task_sg
) {
3912 cmd
->se_dev
->transport
->free_task(task
);
3916 memcpy(task
->task_sg
, cmd
->t_data_sg
,
3917 sizeof(struct scatterlist
) * cmd
->t_data_nents
);
3918 task
->task_size
= cmd
->data_length
;
3919 task
->task_sg_nents
= cmd
->t_data_nents
;
3921 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3922 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3923 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3925 /* Success! Return number of tasks allocated */
3930 * Allocate any required ressources to execute the command, and either place
3931 * it on the execution queue if possible. For writes we might not have the
3932 * payload yet, thus notify the fabric via a call to ->write_pending instead.
3934 int transport_generic_new_cmd(struct se_cmd
*cmd
)
3936 struct se_device
*dev
= cmd
->se_dev
;
3937 int task_cdbs
, task_cdbs_bidi
= 0;
3942 * Determine is the TCM fabric module has already allocated physical
3943 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3946 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
3948 ret
= transport_generic_get_mem(cmd
);
3954 * For BIDI command set up the read tasks first.
3956 if (cmd
->t_bidi_data_sg
&&
3957 dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
3958 BUG_ON(!(cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
));
3960 task_cdbs_bidi
= transport_allocate_data_tasks(cmd
,
3961 DMA_FROM_DEVICE
, cmd
->t_bidi_data_sg
,
3962 cmd
->t_bidi_data_nents
);
3963 if (task_cdbs_bidi
<= 0)
3966 atomic_inc(&cmd
->t_fe_count
);
3967 atomic_inc(&cmd
->t_se_count
);
3971 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
3972 task_cdbs
= transport_allocate_data_tasks(cmd
,
3973 cmd
->data_direction
, cmd
->t_data_sg
,
3976 task_cdbs
= transport_allocate_control_task(cmd
);
3983 atomic_inc(&cmd
->t_fe_count
);
3984 atomic_inc(&cmd
->t_se_count
);
3987 cmd
->t_task_list_num
= (task_cdbs
+ task_cdbs_bidi
);
3988 atomic_set(&cmd
->t_task_cdbs_left
, cmd
->t_task_list_num
);
3989 atomic_set(&cmd
->t_task_cdbs_ex_left
, cmd
->t_task_list_num
);
3990 atomic_set(&cmd
->t_task_cdbs_timeout_left
, cmd
->t_task_list_num
);
3993 * For WRITEs, let the fabric know its buffer is ready..
3994 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3995 * will be added to the struct se_device execution queue after its WRITE
3996 * data has arrived. (ie: It gets handled by the transport processing
3997 * thread a second time)
3999 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4000 transport_add_tasks_to_state_queue(cmd
);
4001 return transport_generic_write_pending(cmd
);
4004 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4005 * to the execution queue.
4007 transport_execute_tasks(cmd
);
4011 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
4012 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
4015 EXPORT_SYMBOL(transport_generic_new_cmd
);
4017 /* transport_generic_process_write():
4021 void transport_generic_process_write(struct se_cmd
*cmd
)
4023 transport_execute_tasks(cmd
);
4025 EXPORT_SYMBOL(transport_generic_process_write
);
4027 static void transport_write_pending_qf(struct se_cmd
*cmd
)
4029 if (cmd
->se_tfo
->write_pending(cmd
) == -EAGAIN
) {
4030 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4032 transport_handle_queue_full(cmd
, cmd
->se_dev
);
4036 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4038 unsigned long flags
;
4041 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4042 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4043 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4046 * Clear the se_cmd for WRITE_PENDING status in order to set
4047 * cmd->t_transport_active=0 so that transport_generic_handle_data
4048 * can be called from HW target mode interrupt code. This is safe
4049 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4050 * because the se_cmd->se_lun pointer is not being cleared.
4052 transport_cmd_check_stop(cmd
, 1, 0);
4055 * Call the fabric write_pending function here to let the
4056 * frontend know that WRITE buffers are ready.
4058 ret
= cmd
->se_tfo
->write_pending(cmd
);
4064 return PYX_TRANSPORT_WRITE_PENDING
;
4067 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4068 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4069 transport_handle_queue_full(cmd
, cmd
->se_dev
);
4074 * transport_release_cmd - free a command
4075 * @cmd: command to free
4077 * This routine unconditionally frees a command, and reference counting
4078 * or list removal must be done in the caller.
4080 void transport_release_cmd(struct se_cmd
*cmd
)
4082 BUG_ON(!cmd
->se_tfo
);
4084 if (cmd
->se_tmr_req
)
4085 core_tmr_release_req(cmd
->se_tmr_req
);
4086 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
4087 kfree(cmd
->t_task_cdb
);
4088 cmd
->se_tfo
->release_cmd(cmd
);
4090 EXPORT_SYMBOL(transport_release_cmd
);
4092 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
4094 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
4095 if (wait_for_tasks
&& cmd
->se_tmr_req
)
4096 transport_wait_for_tasks(cmd
);
4098 transport_release_cmd(cmd
);
4101 transport_wait_for_tasks(cmd
);
4103 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4106 transport_lun_remove_cmd(cmd
);
4108 transport_free_dev_tasks(cmd
);
4110 transport_put_cmd(cmd
);
4113 EXPORT_SYMBOL(transport_generic_free_cmd
);
4115 /* transport_lun_wait_for_tasks():
4117 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4118 * an struct se_lun to be successfully shutdown.
4120 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4122 unsigned long flags
;
4125 * If the frontend has already requested this struct se_cmd to
4126 * be stopped, we can safely ignore this struct se_cmd.
4128 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4129 if (atomic_read(&cmd
->t_transport_stop
)) {
4130 atomic_set(&cmd
->transport_lun_stop
, 0);
4131 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4132 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4133 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4134 transport_cmd_check_stop(cmd
, 1, 0);
4137 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4138 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4140 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4142 ret
= transport_stop_tasks_for_cmd(cmd
);
4144 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4145 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4147 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4148 cmd
->se_tfo
->get_task_tag(cmd
));
4149 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4150 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4151 cmd
->se_tfo
->get_task_tag(cmd
));
4153 transport_remove_cmd_from_queue(cmd
);
4158 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4160 struct se_cmd
*cmd
= NULL
;
4161 unsigned long lun_flags
, cmd_flags
;
4163 * Do exception processing and return CHECK_CONDITION status to the
4166 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4167 while (!list_empty(&lun
->lun_cmd_list
)) {
4168 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4169 struct se_cmd
, se_lun_node
);
4170 list_del(&cmd
->se_lun_node
);
4172 atomic_set(&cmd
->transport_lun_active
, 0);
4174 * This will notify iscsi_target_transport.c:
4175 * transport_cmd_check_stop() that a LUN shutdown is in
4176 * progress for the iscsi_cmd_t.
4178 spin_lock(&cmd
->t_state_lock
);
4179 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4180 "_lun_stop for ITT: 0x%08x\n",
4181 cmd
->se_lun
->unpacked_lun
,
4182 cmd
->se_tfo
->get_task_tag(cmd
));
4183 atomic_set(&cmd
->transport_lun_stop
, 1);
4184 spin_unlock(&cmd
->t_state_lock
);
4186 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4189 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4190 cmd
->se_tfo
->get_task_tag(cmd
),
4191 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4195 * If the Storage engine still owns the iscsi_cmd_t, determine
4196 * and/or stop its context.
4198 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4199 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4200 cmd
->se_tfo
->get_task_tag(cmd
));
4202 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4203 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4207 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4208 "_wait_for_tasks(): SUCCESS\n",
4209 cmd
->se_lun
->unpacked_lun
,
4210 cmd
->se_tfo
->get_task_tag(cmd
));
4212 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4213 if (!atomic_read(&cmd
->transport_dev_active
)) {
4214 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4217 atomic_set(&cmd
->transport_dev_active
, 0);
4218 transport_all_task_dev_remove_state(cmd
);
4219 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4221 transport_free_dev_tasks(cmd
);
4223 * The Storage engine stopped this struct se_cmd before it was
4224 * send to the fabric frontend for delivery back to the
4225 * Initiator Node. Return this SCSI CDB back with an
4226 * CHECK_CONDITION status.
4229 transport_send_check_condition_and_sense(cmd
,
4230 TCM_NON_EXISTENT_LUN
, 0);
4232 * If the fabric frontend is waiting for this iscsi_cmd_t to
4233 * be released, notify the waiting thread now that LU has
4234 * finished accessing it.
4236 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4237 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4238 pr_debug("SE_LUN[%d] - Detected FE stop for"
4239 " struct se_cmd: %p ITT: 0x%08x\n",
4241 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4243 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4245 transport_cmd_check_stop(cmd
, 1, 0);
4246 complete(&cmd
->transport_lun_fe_stop_comp
);
4247 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4250 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4251 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4253 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4254 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4256 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4259 static int transport_clear_lun_thread(void *p
)
4261 struct se_lun
*lun
= (struct se_lun
*)p
;
4263 __transport_clear_lun_from_sessions(lun
);
4264 complete(&lun
->lun_shutdown_comp
);
4269 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4271 struct task_struct
*kt
;
4273 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4274 "tcm_cl_%u", lun
->unpacked_lun
);
4276 pr_err("Unable to start clear_lun thread\n");
4279 wait_for_completion(&lun
->lun_shutdown_comp
);
4285 * transport_wait_for_tasks - wait for completion to occur
4286 * @cmd: command to wait
4288 * Called from frontend fabric context to wait for storage engine
4289 * to pause and/or release frontend generated struct se_cmd.
4291 void transport_wait_for_tasks(struct se_cmd
*cmd
)
4293 unsigned long flags
;
4295 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4296 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
)) {
4297 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4301 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4302 * has been set in transport_set_supported_SAM_opcode().
4304 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) && !cmd
->se_tmr_req
) {
4305 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4309 * If we are already stopped due to an external event (ie: LUN shutdown)
4310 * sleep until the connection can have the passed struct se_cmd back.
4311 * The cmd->transport_lun_stopped_sem will be upped by
4312 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4313 * has completed its operation on the struct se_cmd.
4315 if (atomic_read(&cmd
->transport_lun_stop
)) {
4317 pr_debug("wait_for_tasks: Stopping"
4318 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4319 "_stop_comp); for ITT: 0x%08x\n",
4320 cmd
->se_tfo
->get_task_tag(cmd
));
4322 * There is a special case for WRITES where a FE exception +
4323 * LUN shutdown means ConfigFS context is still sleeping on
4324 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4325 * We go ahead and up transport_lun_stop_comp just to be sure
4328 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4329 complete(&cmd
->transport_lun_stop_comp
);
4330 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4331 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4333 transport_all_task_dev_remove_state(cmd
);
4335 * At this point, the frontend who was the originator of this
4336 * struct se_cmd, now owns the structure and can be released through
4337 * normal means below.
4339 pr_debug("wait_for_tasks: Stopped"
4340 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4341 "stop_comp); for ITT: 0x%08x\n",
4342 cmd
->se_tfo
->get_task_tag(cmd
));
4344 atomic_set(&cmd
->transport_lun_stop
, 0);
4346 if (!atomic_read(&cmd
->t_transport_active
) ||
4347 atomic_read(&cmd
->t_transport_aborted
)) {
4348 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4352 atomic_set(&cmd
->t_transport_stop
, 1);
4354 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4355 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4356 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4357 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4359 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4361 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4363 wait_for_completion(&cmd
->t_transport_stop_comp
);
4365 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4366 atomic_set(&cmd
->t_transport_active
, 0);
4367 atomic_set(&cmd
->t_transport_stop
, 0);
4369 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4370 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4371 cmd
->se_tfo
->get_task_tag(cmd
));
4373 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4375 EXPORT_SYMBOL(transport_wait_for_tasks
);
4377 static int transport_get_sense_codes(
4382 *asc
= cmd
->scsi_asc
;
4383 *ascq
= cmd
->scsi_ascq
;
4388 static int transport_set_sense_codes(
4393 cmd
->scsi_asc
= asc
;
4394 cmd
->scsi_ascq
= ascq
;
4399 int transport_send_check_condition_and_sense(
4404 unsigned char *buffer
= cmd
->sense_buffer
;
4405 unsigned long flags
;
4407 u8 asc
= 0, ascq
= 0;
4409 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4410 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4411 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4414 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4415 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4417 if (!reason
&& from_transport
)
4420 if (!from_transport
)
4421 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4423 * Data Segment and SenseLength of the fabric response PDU.
4425 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4426 * from include/scsi/scsi_cmnd.h
4428 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4429 TRANSPORT_SENSE_BUFFER
);
4431 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4432 * SENSE KEY values from include/scsi/scsi.h
4435 case TCM_NON_EXISTENT_LUN
:
4437 buffer
[offset
] = 0x70;
4438 /* ILLEGAL REQUEST */
4439 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4440 /* LOGICAL UNIT NOT SUPPORTED */
4441 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4443 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4444 case TCM_SECTOR_COUNT_TOO_MANY
:
4446 buffer
[offset
] = 0x70;
4447 /* ILLEGAL REQUEST */
4448 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4449 /* INVALID COMMAND OPERATION CODE */
4450 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4452 case TCM_UNKNOWN_MODE_PAGE
:
4454 buffer
[offset
] = 0x70;
4455 /* ILLEGAL REQUEST */
4456 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4457 /* INVALID FIELD IN CDB */
4458 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4460 case TCM_CHECK_CONDITION_ABORT_CMD
:
4462 buffer
[offset
] = 0x70;
4463 /* ABORTED COMMAND */
4464 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4465 /* BUS DEVICE RESET FUNCTION OCCURRED */
4466 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4467 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4469 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4471 buffer
[offset
] = 0x70;
4472 /* ABORTED COMMAND */
4473 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4475 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4476 /* NOT ENOUGH UNSOLICITED DATA */
4477 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4479 case TCM_INVALID_CDB_FIELD
:
4481 buffer
[offset
] = 0x70;
4482 /* ABORTED COMMAND */
4483 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4484 /* INVALID FIELD IN CDB */
4485 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4487 case TCM_INVALID_PARAMETER_LIST
:
4489 buffer
[offset
] = 0x70;
4490 /* ABORTED COMMAND */
4491 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4492 /* INVALID FIELD IN PARAMETER LIST */
4493 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4495 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4497 buffer
[offset
] = 0x70;
4498 /* ABORTED COMMAND */
4499 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4501 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4502 /* UNEXPECTED_UNSOLICITED_DATA */
4503 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4505 case TCM_SERVICE_CRC_ERROR
:
4507 buffer
[offset
] = 0x70;
4508 /* ABORTED COMMAND */
4509 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4510 /* PROTOCOL SERVICE CRC ERROR */
4511 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4513 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4515 case TCM_SNACK_REJECTED
:
4517 buffer
[offset
] = 0x70;
4518 /* ABORTED COMMAND */
4519 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4521 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4522 /* FAILED RETRANSMISSION REQUEST */
4523 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4525 case TCM_WRITE_PROTECTED
:
4527 buffer
[offset
] = 0x70;
4529 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4530 /* WRITE PROTECTED */
4531 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4533 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4535 buffer
[offset
] = 0x70;
4536 /* UNIT ATTENTION */
4537 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4538 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4539 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4540 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4542 case TCM_CHECK_CONDITION_NOT_READY
:
4544 buffer
[offset
] = 0x70;
4546 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4547 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4548 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4549 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4551 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4554 buffer
[offset
] = 0x70;
4555 /* ILLEGAL REQUEST */
4556 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4557 /* LOGICAL UNIT COMMUNICATION FAILURE */
4558 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4562 * This code uses linux/include/scsi/scsi.h SAM status codes!
4564 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4566 * Automatically padded, this value is encoded in the fabric's
4567 * data_length response PDU containing the SCSI defined sense data.
4569 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4572 return cmd
->se_tfo
->queue_status(cmd
);
4574 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4576 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4580 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4582 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4585 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4586 " status for CDB: 0x%02x ITT: 0x%08x\n",
4588 cmd
->se_tfo
->get_task_tag(cmd
));
4590 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4591 cmd
->se_tfo
->queue_status(cmd
);
4596 EXPORT_SYMBOL(transport_check_aborted_status
);
4598 void transport_send_task_abort(struct se_cmd
*cmd
)
4600 unsigned long flags
;
4602 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4603 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4604 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4607 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4610 * If there are still expected incoming fabric WRITEs, we wait
4611 * until until they have completed before sending a TASK_ABORTED
4612 * response. This response with TASK_ABORTED status will be
4613 * queued back to fabric module by transport_check_aborted_status().
4615 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4616 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4617 atomic_inc(&cmd
->t_transport_aborted
);
4618 smp_mb__after_atomic_inc();
4619 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4620 transport_new_cmd_failure(cmd
);
4624 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4626 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4627 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4628 cmd
->se_tfo
->get_task_tag(cmd
));
4630 cmd
->se_tfo
->queue_status(cmd
);
4633 /* transport_generic_do_tmr():
4637 int transport_generic_do_tmr(struct se_cmd
*cmd
)
4639 struct se_device
*dev
= cmd
->se_dev
;
4640 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4643 switch (tmr
->function
) {
4644 case TMR_ABORT_TASK
:
4645 tmr
->response
= TMR_FUNCTION_REJECTED
;
4647 case TMR_ABORT_TASK_SET
:
4649 case TMR_CLEAR_TASK_SET
:
4650 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4653 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4654 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4655 TMR_FUNCTION_REJECTED
;
4657 case TMR_TARGET_WARM_RESET
:
4658 tmr
->response
= TMR_FUNCTION_REJECTED
;
4660 case TMR_TARGET_COLD_RESET
:
4661 tmr
->response
= TMR_FUNCTION_REJECTED
;
4664 pr_err("Uknown TMR function: 0x%02x.\n",
4666 tmr
->response
= TMR_FUNCTION_REJECTED
;
4670 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4671 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4673 transport_cmd_check_stop_to_fabric(cmd
);
4677 /* transport_processing_thread():
4681 static int transport_processing_thread(void *param
)
4685 struct se_device
*dev
= (struct se_device
*) param
;
4687 set_user_nice(current
, -20);
4689 while (!kthread_should_stop()) {
4690 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4691 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4692 kthread_should_stop());
4697 __transport_execute_tasks(dev
);
4699 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4703 switch (cmd
->t_state
) {
4704 case TRANSPORT_NEW_CMD
:
4707 case TRANSPORT_NEW_CMD_MAP
:
4708 if (!cmd
->se_tfo
->new_cmd_map
) {
4709 pr_err("cmd->se_tfo->new_cmd_map is"
4710 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4713 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4715 cmd
->transport_error_status
= ret
;
4716 transport_generic_request_failure(cmd
,
4717 0, (cmd
->data_direction
!=
4721 ret
= transport_generic_new_cmd(cmd
);
4725 cmd
->transport_error_status
= ret
;
4726 transport_generic_request_failure(cmd
,
4727 0, (cmd
->data_direction
!=
4731 case TRANSPORT_PROCESS_WRITE
:
4732 transport_generic_process_write(cmd
);
4734 case TRANSPORT_FREE_CMD_INTR
:
4735 transport_generic_free_cmd(cmd
, 0);
4737 case TRANSPORT_PROCESS_TMR
:
4738 transport_generic_do_tmr(cmd
);
4740 case TRANSPORT_COMPLETE_QF_WP
:
4741 transport_write_pending_qf(cmd
);
4743 case TRANSPORT_COMPLETE_QF_OK
:
4744 transport_complete_qf(cmd
);
4747 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4748 "i_state: %d on SE LUN: %u\n",
4750 cmd
->se_tfo
->get_task_tag(cmd
),
4751 cmd
->se_tfo
->get_cmd_state(cmd
),
4752 cmd
->se_lun
->unpacked_lun
);
4760 WARN_ON(!list_empty(&dev
->state_task_list
));
4761 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4762 dev
->process_thread
= NULL
;