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 kmem_cache
*se_cmd_cache
;
62 static struct kmem_cache
*se_sess_cache
;
63 struct kmem_cache
*se_tmr_req_cache
;
64 struct kmem_cache
*se_ua_cache
;
65 struct kmem_cache
*t10_pr_reg_cache
;
66 struct kmem_cache
*t10_alua_lu_gp_cache
;
67 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
68 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
69 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
71 static int transport_generic_write_pending(struct se_cmd
*);
72 static int transport_processing_thread(void *param
);
73 static int __transport_execute_tasks(struct se_device
*dev
);
74 static void transport_complete_task_attr(struct se_cmd
*cmd
);
75 static void transport_handle_queue_full(struct se_cmd
*cmd
,
76 struct se_device
*dev
);
77 static void transport_direct_request_timeout(struct se_cmd
*cmd
);
78 static void transport_free_dev_tasks(struct se_cmd
*cmd
);
79 static u32
transport_allocate_tasks(struct se_cmd
*cmd
,
80 unsigned long long starting_lba
,
81 enum dma_data_direction data_direction
,
82 struct scatterlist
*sgl
, unsigned int nents
);
83 static int transport_generic_get_mem(struct se_cmd
*cmd
);
84 static void transport_put_cmd(struct se_cmd
*cmd
);
85 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
);
86 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
87 static void transport_stop_all_task_timers(struct se_cmd
*cmd
);
89 int init_se_kmem_caches(void)
91 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
92 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
94 pr_err("kmem_cache_create for struct se_cmd failed\n");
97 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
98 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
100 if (!se_tmr_req_cache
) {
101 pr_err("kmem_cache_create() for struct se_tmr_req"
105 se_sess_cache
= kmem_cache_create("se_sess_cache",
106 sizeof(struct se_session
), __alignof__(struct se_session
),
108 if (!se_sess_cache
) {
109 pr_err("kmem_cache_create() for struct se_session"
113 se_ua_cache
= kmem_cache_create("se_ua_cache",
114 sizeof(struct se_ua
), __alignof__(struct se_ua
),
117 pr_err("kmem_cache_create() for struct se_ua failed\n");
120 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
121 sizeof(struct t10_pr_registration
),
122 __alignof__(struct t10_pr_registration
), 0, NULL
);
123 if (!t10_pr_reg_cache
) {
124 pr_err("kmem_cache_create() for struct t10_pr_registration"
128 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
129 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
131 if (!t10_alua_lu_gp_cache
) {
132 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
136 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
137 sizeof(struct t10_alua_lu_gp_member
),
138 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
139 if (!t10_alua_lu_gp_mem_cache
) {
140 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
144 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
145 sizeof(struct t10_alua_tg_pt_gp
),
146 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
147 if (!t10_alua_tg_pt_gp_cache
) {
148 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
152 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
153 "t10_alua_tg_pt_gp_mem_cache",
154 sizeof(struct t10_alua_tg_pt_gp_member
),
155 __alignof__(struct t10_alua_tg_pt_gp_member
),
157 if (!t10_alua_tg_pt_gp_mem_cache
) {
158 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
166 kmem_cache_destroy(se_cmd_cache
);
167 if (se_tmr_req_cache
)
168 kmem_cache_destroy(se_tmr_req_cache
);
170 kmem_cache_destroy(se_sess_cache
);
172 kmem_cache_destroy(se_ua_cache
);
173 if (t10_pr_reg_cache
)
174 kmem_cache_destroy(t10_pr_reg_cache
);
175 if (t10_alua_lu_gp_cache
)
176 kmem_cache_destroy(t10_alua_lu_gp_cache
);
177 if (t10_alua_lu_gp_mem_cache
)
178 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
179 if (t10_alua_tg_pt_gp_cache
)
180 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
181 if (t10_alua_tg_pt_gp_mem_cache
)
182 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
186 void release_se_kmem_caches(void)
188 kmem_cache_destroy(se_cmd_cache
);
189 kmem_cache_destroy(se_tmr_req_cache
);
190 kmem_cache_destroy(se_sess_cache
);
191 kmem_cache_destroy(se_ua_cache
);
192 kmem_cache_destroy(t10_pr_reg_cache
);
193 kmem_cache_destroy(t10_alua_lu_gp_cache
);
194 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
195 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
196 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
199 /* This code ensures unique mib indexes are handed out. */
200 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
201 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
204 * Allocate a new row index for the entry type specified
206 u32
scsi_get_new_index(scsi_index_t type
)
210 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
212 spin_lock(&scsi_mib_index_lock
);
213 new_index
= ++scsi_mib_index
[type
];
214 spin_unlock(&scsi_mib_index_lock
);
219 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
221 atomic_set(&qobj
->queue_cnt
, 0);
222 INIT_LIST_HEAD(&qobj
->qobj_list
);
223 init_waitqueue_head(&qobj
->thread_wq
);
224 spin_lock_init(&qobj
->cmd_queue_lock
);
226 EXPORT_SYMBOL(transport_init_queue_obj
);
228 static int transport_subsystem_reqmods(void)
232 ret
= request_module("target_core_iblock");
234 pr_err("Unable to load target_core_iblock\n");
236 ret
= request_module("target_core_file");
238 pr_err("Unable to load target_core_file\n");
240 ret
= request_module("target_core_pscsi");
242 pr_err("Unable to load target_core_pscsi\n");
244 ret
= request_module("target_core_stgt");
246 pr_err("Unable to load target_core_stgt\n");
251 int transport_subsystem_check_init(void)
255 if (sub_api_initialized
)
258 * Request the loading of known TCM subsystem plugins..
260 ret
= transport_subsystem_reqmods();
264 sub_api_initialized
= 1;
268 struct se_session
*transport_init_session(void)
270 struct se_session
*se_sess
;
272 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
274 pr_err("Unable to allocate struct se_session from"
276 return ERR_PTR(-ENOMEM
);
278 INIT_LIST_HEAD(&se_sess
->sess_list
);
279 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
283 EXPORT_SYMBOL(transport_init_session
);
286 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
288 void __transport_register_session(
289 struct se_portal_group
*se_tpg
,
290 struct se_node_acl
*se_nacl
,
291 struct se_session
*se_sess
,
292 void *fabric_sess_ptr
)
294 unsigned char buf
[PR_REG_ISID_LEN
];
296 se_sess
->se_tpg
= se_tpg
;
297 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
299 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
301 * Only set for struct se_session's that will actually be moving I/O.
302 * eg: *NOT* discovery sessions.
306 * If the fabric module supports an ISID based TransportID,
307 * save this value in binary from the fabric I_T Nexus now.
309 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
310 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
311 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
312 &buf
[0], PR_REG_ISID_LEN
);
313 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
315 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
317 * The se_nacl->nacl_sess pointer will be set to the
318 * last active I_T Nexus for each struct se_node_acl.
320 se_nacl
->nacl_sess
= se_sess
;
322 list_add_tail(&se_sess
->sess_acl_list
,
323 &se_nacl
->acl_sess_list
);
324 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
326 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
328 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
329 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
331 EXPORT_SYMBOL(__transport_register_session
);
333 void transport_register_session(
334 struct se_portal_group
*se_tpg
,
335 struct se_node_acl
*se_nacl
,
336 struct se_session
*se_sess
,
337 void *fabric_sess_ptr
)
339 spin_lock_bh(&se_tpg
->session_lock
);
340 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
341 spin_unlock_bh(&se_tpg
->session_lock
);
343 EXPORT_SYMBOL(transport_register_session
);
345 void transport_deregister_session_configfs(struct se_session
*se_sess
)
347 struct se_node_acl
*se_nacl
;
350 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
352 se_nacl
= se_sess
->se_node_acl
;
354 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
355 list_del(&se_sess
->sess_acl_list
);
357 * If the session list is empty, then clear the pointer.
358 * Otherwise, set the struct se_session pointer from the tail
359 * element of the per struct se_node_acl active session list.
361 if (list_empty(&se_nacl
->acl_sess_list
))
362 se_nacl
->nacl_sess
= NULL
;
364 se_nacl
->nacl_sess
= container_of(
365 se_nacl
->acl_sess_list
.prev
,
366 struct se_session
, sess_acl_list
);
368 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
371 EXPORT_SYMBOL(transport_deregister_session_configfs
);
373 void transport_free_session(struct se_session
*se_sess
)
375 kmem_cache_free(se_sess_cache
, se_sess
);
377 EXPORT_SYMBOL(transport_free_session
);
379 void transport_deregister_session(struct se_session
*se_sess
)
381 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
382 struct se_node_acl
*se_nacl
;
386 transport_free_session(se_sess
);
390 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
391 list_del(&se_sess
->sess_list
);
392 se_sess
->se_tpg
= NULL
;
393 se_sess
->fabric_sess_ptr
= NULL
;
394 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
397 * Determine if we need to do extra work for this initiator node's
398 * struct se_node_acl if it had been previously dynamically generated.
400 se_nacl
= se_sess
->se_node_acl
;
402 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
403 if (se_nacl
->dynamic_node_acl
) {
404 if (!se_tpg
->se_tpg_tfo
->tpg_check_demo_mode_cache(
406 list_del(&se_nacl
->acl_list
);
407 se_tpg
->num_node_acls
--;
408 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
410 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
411 core_free_device_list_for_node(se_nacl
, se_tpg
);
412 se_tpg
->se_tpg_tfo
->tpg_release_fabric_acl(se_tpg
,
414 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
417 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
420 transport_free_session(se_sess
);
422 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
423 se_tpg
->se_tpg_tfo
->get_fabric_name());
425 EXPORT_SYMBOL(transport_deregister_session
);
428 * Called with cmd->t_state_lock held.
430 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
432 struct se_device
*dev
= cmd
->se_dev
;
433 struct se_task
*task
;
439 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
440 if (task
->task_flags
& TF_ACTIVE
)
443 if (!atomic_read(&task
->task_state_active
))
446 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
447 list_del(&task
->t_state_list
);
448 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
449 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
450 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
452 atomic_set(&task
->task_state_active
, 0);
453 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
457 /* transport_cmd_check_stop():
459 * 'transport_off = 1' determines if t_transport_active should be cleared.
460 * 'transport_off = 2' determines if task_dev_state should be removed.
462 * A non-zero u8 t_state sets cmd->t_state.
463 * Returns 1 when command is stopped, else 0.
465 static int transport_cmd_check_stop(
472 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
474 * Determine if IOCTL context caller in requesting the stopping of this
475 * command for LUN shutdown purposes.
477 if (atomic_read(&cmd
->transport_lun_stop
)) {
478 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
479 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
480 cmd
->se_tfo
->get_task_tag(cmd
));
482 cmd
->deferred_t_state
= cmd
->t_state
;
483 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
484 atomic_set(&cmd
->t_transport_active
, 0);
485 if (transport_off
== 2)
486 transport_all_task_dev_remove_state(cmd
);
487 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
489 complete(&cmd
->transport_lun_stop_comp
);
493 * Determine if frontend context caller is requesting the stopping of
494 * this command for frontend exceptions.
496 if (atomic_read(&cmd
->t_transport_stop
)) {
497 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
498 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
499 cmd
->se_tfo
->get_task_tag(cmd
));
501 cmd
->deferred_t_state
= cmd
->t_state
;
502 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
503 if (transport_off
== 2)
504 transport_all_task_dev_remove_state(cmd
);
507 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
510 if (transport_off
== 2)
512 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
514 complete(&cmd
->t_transport_stop_comp
);
518 atomic_set(&cmd
->t_transport_active
, 0);
519 if (transport_off
== 2) {
520 transport_all_task_dev_remove_state(cmd
);
522 * Clear struct se_cmd->se_lun before the transport_off == 2
523 * handoff to fabric module.
527 * Some fabric modules like tcm_loop can release
528 * their internally allocated I/O reference now and
531 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
532 spin_unlock_irqrestore(
533 &cmd
->t_state_lock
, flags
);
535 cmd
->se_tfo
->check_stop_free(cmd
);
539 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
543 cmd
->t_state
= t_state
;
544 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
549 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
551 return transport_cmd_check_stop(cmd
, 2, 0);
554 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
556 struct se_lun
*lun
= cmd
->se_lun
;
562 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
563 if (!atomic_read(&cmd
->transport_dev_active
)) {
564 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
567 atomic_set(&cmd
->transport_dev_active
, 0);
568 transport_all_task_dev_remove_state(cmd
);
569 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
573 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
574 if (atomic_read(&cmd
->transport_lun_active
)) {
575 list_del(&cmd
->se_lun_node
);
576 atomic_set(&cmd
->transport_lun_active
, 0);
578 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
579 cmd
->se_tfo
->get_task_tag(cmd
), lun
->unpacked_lun
);
582 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
585 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
587 if (!cmd
->se_tmr_req
)
588 transport_lun_remove_cmd(cmd
);
590 if (transport_cmd_check_stop_to_fabric(cmd
))
593 transport_remove_cmd_from_queue(cmd
);
594 transport_put_cmd(cmd
);
598 static void transport_add_cmd_to_queue(struct se_cmd
*cmd
, int t_state
,
601 struct se_device
*dev
= cmd
->se_dev
;
602 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
606 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
607 cmd
->t_state
= t_state
;
608 atomic_set(&cmd
->t_transport_active
, 1);
609 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
612 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
614 /* If the cmd is already on the list, remove it before we add it */
615 if (!list_empty(&cmd
->se_queue_node
))
616 list_del(&cmd
->se_queue_node
);
618 atomic_inc(&qobj
->queue_cnt
);
621 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
623 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
624 atomic_set(&cmd
->t_transport_queue_active
, 1);
625 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
627 wake_up_interruptible(&qobj
->thread_wq
);
630 static struct se_cmd
*
631 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
636 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
637 if (list_empty(&qobj
->qobj_list
)) {
638 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
641 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
643 atomic_set(&cmd
->t_transport_queue_active
, 0);
645 list_del_init(&cmd
->se_queue_node
);
646 atomic_dec(&qobj
->queue_cnt
);
647 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
652 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
)
654 struct se_queue_obj
*qobj
= &cmd
->se_dev
->dev_queue_obj
;
657 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
658 if (!atomic_read(&cmd
->t_transport_queue_active
)) {
659 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
662 atomic_set(&cmd
->t_transport_queue_active
, 0);
663 atomic_dec(&qobj
->queue_cnt
);
664 list_del_init(&cmd
->se_queue_node
);
665 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
667 if (atomic_read(&cmd
->t_transport_queue_active
)) {
668 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
669 cmd
->se_tfo
->get_task_tag(cmd
),
670 atomic_read(&cmd
->t_transport_queue_active
));
675 * Completion function used by TCM subsystem plugins (such as FILEIO)
676 * for queueing up response from struct se_subsystem_api->do_task()
678 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
680 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
681 struct se_task
, t_list
);
684 cmd
->scsi_status
= SAM_STAT_GOOD
;
685 task
->task_scsi_status
= GOOD
;
687 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
688 task
->task_error_status
= PYX_TRANSPORT_ILLEGAL_REQUEST
;
689 task
->task_se_cmd
->transport_error_status
=
690 PYX_TRANSPORT_ILLEGAL_REQUEST
;
693 transport_complete_task(task
, good
);
695 EXPORT_SYMBOL(transport_complete_sync_cache
);
697 /* transport_complete_task():
699 * Called from interrupt and non interrupt context depending
700 * on the transport plugin.
702 void transport_complete_task(struct se_task
*task
, int success
)
704 struct se_cmd
*cmd
= task
->task_se_cmd
;
705 struct se_device
*dev
= cmd
->se_dev
;
709 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
710 cmd
->t_task_cdb
[0], dev
);
713 atomic_inc(&dev
->depth_left
);
715 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
716 task
->task_flags
&= ~TF_ACTIVE
;
719 * See if any sense data exists, if so set the TASK_SENSE flag.
720 * Also check for any other post completion work that needs to be
721 * done by the plugins.
723 if (dev
&& dev
->transport
->transport_complete
) {
724 if (dev
->transport
->transport_complete(task
) != 0) {
725 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
726 task
->task_sense
= 1;
732 * See if we are waiting for outstanding struct se_task
733 * to complete for an exception condition
735 if (task
->task_flags
& TF_REQUEST_STOP
) {
737 * Decrement cmd->t_se_count if this task had
738 * previously thrown its timeout exception handler.
740 if (task
->task_flags
& TF_TIMEOUT
) {
741 atomic_dec(&cmd
->t_se_count
);
742 task
->task_flags
&= ~TF_TIMEOUT
;
744 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
746 complete(&task
->task_stop_comp
);
750 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
751 * left counter to determine when the struct se_cmd is ready to be queued to
752 * the processing thread.
754 if (task
->task_flags
& TF_TIMEOUT
) {
755 if (!atomic_dec_and_test(
756 &cmd
->t_task_cdbs_timeout_left
)) {
757 spin_unlock_irqrestore(&cmd
->t_state_lock
,
761 t_state
= TRANSPORT_COMPLETE_TIMEOUT
;
762 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
764 transport_add_cmd_to_queue(cmd
, t_state
, false);
767 atomic_dec(&cmd
->t_task_cdbs_timeout_left
);
770 * Decrement the outstanding t_task_cdbs_left count. The last
771 * struct se_task from struct se_cmd will complete itself into the
772 * device queue depending upon int success.
774 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
776 cmd
->t_tasks_failed
= 1;
778 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
782 if (!success
|| cmd
->t_tasks_failed
) {
783 t_state
= TRANSPORT_COMPLETE_FAILURE
;
784 if (!task
->task_error_status
) {
785 task
->task_error_status
=
786 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
787 cmd
->transport_error_status
=
788 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
791 atomic_set(&cmd
->t_transport_complete
, 1);
792 t_state
= TRANSPORT_COMPLETE_OK
;
794 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
796 transport_add_cmd_to_queue(cmd
, t_state
, false);
798 EXPORT_SYMBOL(transport_complete_task
);
801 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
802 * struct se_task list are ready to be added to the active execution list
805 * Called with se_dev_t->execute_task_lock called.
807 static inline int transport_add_task_check_sam_attr(
808 struct se_task
*task
,
809 struct se_task
*task_prev
,
810 struct se_device
*dev
)
813 * No SAM Task attribute emulation enabled, add to tail of
816 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
817 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
821 * HEAD_OF_QUEUE attribute for received CDB, which means
822 * the first task that is associated with a struct se_cmd goes to
823 * head of the struct se_device->execute_task_list, and task_prev
824 * after that for each subsequent task
826 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
827 list_add(&task
->t_execute_list
,
828 (task_prev
!= NULL
) ?
829 &task_prev
->t_execute_list
:
830 &dev
->execute_task_list
);
832 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
833 " in execution queue\n",
834 task
->task_se_cmd
->t_task_cdb
[0]);
838 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
839 * transitioned from Dermant -> Active state, and are added to the end
840 * of the struct se_device->execute_task_list
842 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
846 /* __transport_add_task_to_execute_queue():
848 * Called with se_dev_t->execute_task_lock called.
850 static void __transport_add_task_to_execute_queue(
851 struct se_task
*task
,
852 struct se_task
*task_prev
,
853 struct se_device
*dev
)
857 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
858 atomic_inc(&dev
->execute_tasks
);
860 if (atomic_read(&task
->task_state_active
))
863 * Determine if this task needs to go to HEAD_OF_QUEUE for the
864 * state list as well. Running with SAM Task Attribute emulation
865 * will always return head_of_queue == 0 here
868 list_add(&task
->t_state_list
, (task_prev
) ?
869 &task_prev
->t_state_list
:
870 &dev
->state_task_list
);
872 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
874 atomic_set(&task
->task_state_active
, 1);
876 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
877 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
881 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
883 struct se_device
*dev
= cmd
->se_dev
;
884 struct se_task
*task
;
887 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
888 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
889 if (atomic_read(&task
->task_state_active
))
892 spin_lock(&dev
->execute_task_lock
);
893 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
894 atomic_set(&task
->task_state_active
, 1);
896 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
897 task
->task_se_cmd
->se_tfo
->get_task_tag(
898 task
->task_se_cmd
), task
, dev
);
900 spin_unlock(&dev
->execute_task_lock
);
902 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
905 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
907 struct se_device
*dev
= cmd
->se_dev
;
908 struct se_task
*task
, *task_prev
= NULL
;
911 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
912 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
913 if (!list_empty(&task
->t_execute_list
))
916 * __transport_add_task_to_execute_queue() handles the
917 * SAM Task Attribute emulation if enabled
919 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
922 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
925 void __transport_remove_task_from_execute_queue(struct se_task
*task
,
926 struct se_device
*dev
)
928 list_del_init(&task
->t_execute_list
);
929 atomic_dec(&dev
->execute_tasks
);
932 void transport_remove_task_from_execute_queue(
933 struct se_task
*task
,
934 struct se_device
*dev
)
938 if (WARN_ON(list_empty(&task
->t_execute_list
)))
941 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
942 __transport_remove_task_from_execute_queue(task
, dev
);
943 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
947 * Handle QUEUE_FULL / -EAGAIN status
950 static void target_qf_do_work(struct work_struct
*work
)
952 struct se_device
*dev
= container_of(work
, struct se_device
,
954 LIST_HEAD(qf_cmd_list
);
955 struct se_cmd
*cmd
, *cmd_tmp
;
957 spin_lock_irq(&dev
->qf_cmd_lock
);
958 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
959 spin_unlock_irq(&dev
->qf_cmd_lock
);
961 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
962 list_del(&cmd
->se_qf_node
);
963 atomic_dec(&dev
->dev_qf_count
);
964 smp_mb__after_atomic_dec();
966 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
967 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
968 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
969 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
972 transport_add_cmd_to_queue(cmd
, cmd
->t_state
, true);
976 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
978 switch (cmd
->data_direction
) {
981 case DMA_FROM_DEVICE
:
985 case DMA_BIDIRECTIONAL
:
994 void transport_dump_dev_state(
995 struct se_device
*dev
,
999 *bl
+= sprintf(b
+ *bl
, "Status: ");
1000 switch (dev
->dev_status
) {
1001 case TRANSPORT_DEVICE_ACTIVATED
:
1002 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1004 case TRANSPORT_DEVICE_DEACTIVATED
:
1005 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1007 case TRANSPORT_DEVICE_SHUTDOWN
:
1008 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1010 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1011 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1012 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1015 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1019 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1020 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1022 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1023 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
1024 *bl
+= sprintf(b
+ *bl
, " ");
1027 void transport_dump_vpd_proto_id(
1028 struct t10_vpd
*vpd
,
1029 unsigned char *p_buf
,
1032 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1035 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1036 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1038 switch (vpd
->protocol_identifier
) {
1040 sprintf(buf
+len
, "Fibre Channel\n");
1043 sprintf(buf
+len
, "Parallel SCSI\n");
1046 sprintf(buf
+len
, "SSA\n");
1049 sprintf(buf
+len
, "IEEE 1394\n");
1052 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1056 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1059 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1062 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1066 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1069 sprintf(buf
+len
, "Unknown 0x%02x\n",
1070 vpd
->protocol_identifier
);
1075 strncpy(p_buf
, buf
, p_buf_len
);
1077 pr_debug("%s", buf
);
1081 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1084 * Check if the Protocol Identifier Valid (PIV) bit is set..
1086 * from spc3r23.pdf section 7.5.1
1088 if (page_83
[1] & 0x80) {
1089 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1090 vpd
->protocol_identifier_set
= 1;
1091 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1094 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1096 int transport_dump_vpd_assoc(
1097 struct t10_vpd
*vpd
,
1098 unsigned char *p_buf
,
1101 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1105 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1106 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1108 switch (vpd
->association
) {
1110 sprintf(buf
+len
, "addressed logical unit\n");
1113 sprintf(buf
+len
, "target port\n");
1116 sprintf(buf
+len
, "SCSI target device\n");
1119 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1125 strncpy(p_buf
, buf
, p_buf_len
);
1127 pr_debug("%s", buf
);
1132 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1135 * The VPD identification association..
1137 * from spc3r23.pdf Section 7.6.3.1 Table 297
1139 vpd
->association
= (page_83
[1] & 0x30);
1140 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1142 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1144 int transport_dump_vpd_ident_type(
1145 struct t10_vpd
*vpd
,
1146 unsigned char *p_buf
,
1149 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1153 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1154 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1156 switch (vpd
->device_identifier_type
) {
1158 sprintf(buf
+len
, "Vendor specific\n");
1161 sprintf(buf
+len
, "T10 Vendor ID based\n");
1164 sprintf(buf
+len
, "EUI-64 based\n");
1167 sprintf(buf
+len
, "NAA\n");
1170 sprintf(buf
+len
, "Relative target port identifier\n");
1173 sprintf(buf
+len
, "SCSI name string\n");
1176 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1177 vpd
->device_identifier_type
);
1183 if (p_buf_len
< strlen(buf
)+1)
1185 strncpy(p_buf
, buf
, p_buf_len
);
1187 pr_debug("%s", buf
);
1193 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1196 * The VPD identifier type..
1198 * from spc3r23.pdf Section 7.6.3.1 Table 298
1200 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1201 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1203 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1205 int transport_dump_vpd_ident(
1206 struct t10_vpd
*vpd
,
1207 unsigned char *p_buf
,
1210 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1213 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1215 switch (vpd
->device_identifier_code_set
) {
1216 case 0x01: /* Binary */
1217 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1218 &vpd
->device_identifier
[0]);
1220 case 0x02: /* ASCII */
1221 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1222 &vpd
->device_identifier
[0]);
1224 case 0x03: /* UTF-8 */
1225 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1226 &vpd
->device_identifier
[0]);
1229 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1230 " 0x%02x", vpd
->device_identifier_code_set
);
1236 strncpy(p_buf
, buf
, p_buf_len
);
1238 pr_debug("%s", buf
);
1244 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1246 static const char hex_str
[] = "0123456789abcdef";
1247 int j
= 0, i
= 4; /* offset to start of the identifer */
1250 * The VPD Code Set (encoding)
1252 * from spc3r23.pdf Section 7.6.3.1 Table 296
1254 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1255 switch (vpd
->device_identifier_code_set
) {
1256 case 0x01: /* Binary */
1257 vpd
->device_identifier
[j
++] =
1258 hex_str
[vpd
->device_identifier_type
];
1259 while (i
< (4 + page_83
[3])) {
1260 vpd
->device_identifier
[j
++] =
1261 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1262 vpd
->device_identifier
[j
++] =
1263 hex_str
[page_83
[i
] & 0x0f];
1267 case 0x02: /* ASCII */
1268 case 0x03: /* UTF-8 */
1269 while (i
< (4 + page_83
[3]))
1270 vpd
->device_identifier
[j
++] = page_83
[i
++];
1276 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1278 EXPORT_SYMBOL(transport_set_vpd_ident
);
1280 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1283 * If this device is from Target_Core_Mod/pSCSI, disable the
1284 * SAM Task Attribute emulation.
1286 * This is currently not available in upsream Linux/SCSI Target
1287 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1289 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1290 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1294 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1295 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1296 " device\n", dev
->transport
->name
,
1297 dev
->transport
->get_device_rev(dev
));
1300 static void scsi_dump_inquiry(struct se_device
*dev
)
1302 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1305 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1307 pr_debug(" Vendor: ");
1308 for (i
= 0; i
< 8; i
++)
1309 if (wwn
->vendor
[i
] >= 0x20)
1310 pr_debug("%c", wwn
->vendor
[i
]);
1314 pr_debug(" Model: ");
1315 for (i
= 0; i
< 16; i
++)
1316 if (wwn
->model
[i
] >= 0x20)
1317 pr_debug("%c", wwn
->model
[i
]);
1321 pr_debug(" Revision: ");
1322 for (i
= 0; i
< 4; i
++)
1323 if (wwn
->revision
[i
] >= 0x20)
1324 pr_debug("%c", wwn
->revision
[i
]);
1330 device_type
= dev
->transport
->get_device_type(dev
);
1331 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1332 pr_debug(" ANSI SCSI revision: %02x\n",
1333 dev
->transport
->get_device_rev(dev
));
1336 struct se_device
*transport_add_device_to_core_hba(
1338 struct se_subsystem_api
*transport
,
1339 struct se_subsystem_dev
*se_dev
,
1341 void *transport_dev
,
1342 struct se_dev_limits
*dev_limits
,
1343 const char *inquiry_prod
,
1344 const char *inquiry_rev
)
1347 struct se_device
*dev
;
1349 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1351 pr_err("Unable to allocate memory for se_dev_t\n");
1355 transport_init_queue_obj(&dev
->dev_queue_obj
);
1356 dev
->dev_flags
= device_flags
;
1357 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1358 dev
->dev_ptr
= transport_dev
;
1360 dev
->se_sub_dev
= se_dev
;
1361 dev
->transport
= transport
;
1362 atomic_set(&dev
->active_cmds
, 0);
1363 INIT_LIST_HEAD(&dev
->dev_list
);
1364 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1365 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1366 INIT_LIST_HEAD(&dev
->execute_task_list
);
1367 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1368 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1369 INIT_LIST_HEAD(&dev
->state_task_list
);
1370 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1371 spin_lock_init(&dev
->execute_task_lock
);
1372 spin_lock_init(&dev
->delayed_cmd_lock
);
1373 spin_lock_init(&dev
->ordered_cmd_lock
);
1374 spin_lock_init(&dev
->state_task_lock
);
1375 spin_lock_init(&dev
->dev_alua_lock
);
1376 spin_lock_init(&dev
->dev_reservation_lock
);
1377 spin_lock_init(&dev
->dev_status_lock
);
1378 spin_lock_init(&dev
->dev_status_thr_lock
);
1379 spin_lock_init(&dev
->se_port_lock
);
1380 spin_lock_init(&dev
->se_tmr_lock
);
1381 spin_lock_init(&dev
->qf_cmd_lock
);
1383 dev
->queue_depth
= dev_limits
->queue_depth
;
1384 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1385 atomic_set(&dev
->dev_ordered_id
, 0);
1387 se_dev_set_default_attribs(dev
, dev_limits
);
1389 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1390 dev
->creation_time
= get_jiffies_64();
1391 spin_lock_init(&dev
->stats_lock
);
1393 spin_lock(&hba
->device_lock
);
1394 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1396 spin_unlock(&hba
->device_lock
);
1398 * Setup the SAM Task Attribute emulation for struct se_device
1400 core_setup_task_attr_emulation(dev
);
1402 * Force PR and ALUA passthrough emulation with internal object use.
1404 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1406 * Setup the Reservations infrastructure for struct se_device
1408 core_setup_reservations(dev
, force_pt
);
1410 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1412 if (core_setup_alua(dev
, force_pt
) < 0)
1416 * Startup the struct se_device processing thread
1418 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1419 "LIO_%s", dev
->transport
->name
);
1420 if (IS_ERR(dev
->process_thread
)) {
1421 pr_err("Unable to create kthread: LIO_%s\n",
1422 dev
->transport
->name
);
1426 * Setup work_queue for QUEUE_FULL
1428 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1430 * Preload the initial INQUIRY const values if we are doing
1431 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1432 * passthrough because this is being provided by the backend LLD.
1433 * This is required so that transport_get_inquiry() copies these
1434 * originals once back into DEV_T10_WWN(dev) for the virtual device
1437 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1438 if (!inquiry_prod
|| !inquiry_rev
) {
1439 pr_err("All non TCM/pSCSI plugins require"
1440 " INQUIRY consts\n");
1444 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1445 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1446 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1448 scsi_dump_inquiry(dev
);
1452 kthread_stop(dev
->process_thread
);
1454 spin_lock(&hba
->device_lock
);
1455 list_del(&dev
->dev_list
);
1457 spin_unlock(&hba
->device_lock
);
1459 se_release_vpd_for_dev(dev
);
1465 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1467 /* transport_generic_prepare_cdb():
1469 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1470 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1471 * The point of this is since we are mapping iSCSI LUNs to
1472 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1473 * devices and HBAs for a loop.
1475 static inline void transport_generic_prepare_cdb(
1479 case READ_10
: /* SBC - RDProtect */
1480 case READ_12
: /* SBC - RDProtect */
1481 case READ_16
: /* SBC - RDProtect */
1482 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1483 case VERIFY
: /* SBC - VRProtect */
1484 case VERIFY_16
: /* SBC - VRProtect */
1485 case WRITE_VERIFY
: /* SBC - VRProtect */
1486 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1489 cdb
[1] &= 0x1f; /* clear logical unit number */
1494 static struct se_task
*
1495 transport_generic_get_task(struct se_cmd
*cmd
,
1496 enum dma_data_direction data_direction
)
1498 struct se_task
*task
;
1499 struct se_device
*dev
= cmd
->se_dev
;
1501 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1503 pr_err("Unable to allocate struct se_task\n");
1507 INIT_LIST_HEAD(&task
->t_list
);
1508 INIT_LIST_HEAD(&task
->t_execute_list
);
1509 INIT_LIST_HEAD(&task
->t_state_list
);
1510 init_completion(&task
->task_stop_comp
);
1511 task
->task_se_cmd
= cmd
;
1512 task
->task_data_direction
= data_direction
;
1517 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1520 * Used by fabric modules containing a local struct se_cmd within their
1521 * fabric dependent per I/O descriptor.
1523 void transport_init_se_cmd(
1525 struct target_core_fabric_ops
*tfo
,
1526 struct se_session
*se_sess
,
1530 unsigned char *sense_buffer
)
1532 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1533 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1534 INIT_LIST_HEAD(&cmd
->se_ordered_node
);
1535 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1536 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1538 INIT_LIST_HEAD(&cmd
->t_task_list
);
1539 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1540 init_completion(&cmd
->transport_lun_stop_comp
);
1541 init_completion(&cmd
->t_transport_stop_comp
);
1542 spin_lock_init(&cmd
->t_state_lock
);
1543 atomic_set(&cmd
->transport_dev_active
, 1);
1546 cmd
->se_sess
= se_sess
;
1547 cmd
->data_length
= data_length
;
1548 cmd
->data_direction
= data_direction
;
1549 cmd
->sam_task_attr
= task_attr
;
1550 cmd
->sense_buffer
= sense_buffer
;
1552 EXPORT_SYMBOL(transport_init_se_cmd
);
1554 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1557 * Check if SAM Task Attribute emulation is enabled for this
1558 * struct se_device storage object
1560 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1563 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1564 pr_debug("SAM Task Attribute ACA"
1565 " emulation is not supported\n");
1569 * Used to determine when ORDERED commands should go from
1570 * Dormant to Active status.
1572 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1573 smp_mb__after_atomic_inc();
1574 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1575 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1576 cmd
->se_dev
->transport
->name
);
1580 /* transport_generic_allocate_tasks():
1582 * Called from fabric RX Thread.
1584 int transport_generic_allocate_tasks(
1590 transport_generic_prepare_cdb(cdb
);
1592 * Ensure that the received CDB is less than the max (252 + 8) bytes
1593 * for VARIABLE_LENGTH_CMD
1595 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1596 pr_err("Received SCSI CDB with command_size: %d that"
1597 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1598 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1602 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1603 * allocate the additional extended CDB buffer now.. Otherwise
1604 * setup the pointer from __t_task_cdb to t_task_cdb.
1606 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1607 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1609 if (!cmd
->t_task_cdb
) {
1610 pr_err("Unable to allocate cmd->t_task_cdb"
1611 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1612 scsi_command_size(cdb
),
1613 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1617 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1619 * Copy the original CDB into cmd->
1621 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1623 * Setup the received CDB based on SCSI defined opcodes and
1624 * perform unit attention, persistent reservations and ALUA
1625 * checks for virtual device backends. The cmd->t_task_cdb
1626 * pointer is expected to be setup before we reach this point.
1628 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1632 * Check for SAM Task Attribute Emulation
1634 if (transport_check_alloc_task_attr(cmd
) < 0) {
1635 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1636 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1639 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1640 if (cmd
->se_lun
->lun_sep
)
1641 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1642 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1645 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1647 static void transport_generic_request_failure(struct se_cmd
*,
1648 struct se_device
*, int, int);
1650 * Used by fabric module frontends to queue tasks directly.
1651 * Many only be used from process context only
1653 int transport_handle_cdb_direct(
1660 pr_err("cmd->se_lun is NULL\n");
1663 if (in_interrupt()) {
1665 pr_err("transport_generic_handle_cdb cannot be called"
1666 " from interrupt context\n");
1670 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1671 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1672 * in existing usage to ensure that outstanding descriptors are handled
1673 * correctly during shutdown via transport_wait_for_tasks()
1675 * Also, we don't take cmd->t_state_lock here as we only expect
1676 * this to be called for initial descriptor submission.
1678 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1679 atomic_set(&cmd
->t_transport_active
, 1);
1681 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1682 * so follow TRANSPORT_NEW_CMD processing thread context usage
1683 * and call transport_generic_request_failure() if necessary..
1685 ret
= transport_generic_new_cmd(cmd
);
1689 cmd
->transport_error_status
= ret
;
1690 transport_generic_request_failure(cmd
, NULL
, 0,
1691 (cmd
->data_direction
!= DMA_TO_DEVICE
));
1695 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1698 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1699 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1700 * complete setup in TCM process context w/ TFO->new_cmd_map().
1702 int transport_generic_handle_cdb_map(
1707 pr_err("cmd->se_lun is NULL\n");
1711 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
, false);
1714 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1716 /* transport_generic_handle_data():
1720 int transport_generic_handle_data(
1724 * For the software fabric case, then we assume the nexus is being
1725 * failed/shutdown when signals are pending from the kthread context
1726 * caller, so we return a failure. For the HW target mode case running
1727 * in interrupt code, the signal_pending() check is skipped.
1729 if (!in_interrupt() && signal_pending(current
))
1732 * If the received CDB has aleady been ABORTED by the generic
1733 * target engine, we now call transport_check_aborted_status()
1734 * to queue any delated TASK_ABORTED status for the received CDB to the
1735 * fabric module as we are expecting no further incoming DATA OUT
1736 * sequences at this point.
1738 if (transport_check_aborted_status(cmd
, 1) != 0)
1741 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
, false);
1744 EXPORT_SYMBOL(transport_generic_handle_data
);
1746 /* transport_generic_handle_tmr():
1750 int transport_generic_handle_tmr(
1753 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
, false);
1756 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1758 void transport_generic_free_cmd_intr(
1761 transport_add_cmd_to_queue(cmd
, TRANSPORT_FREE_CMD_INTR
, false);
1763 EXPORT_SYMBOL(transport_generic_free_cmd_intr
);
1765 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1767 struct se_task
*task
, *task_tmp
;
1768 unsigned long flags
;
1771 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1772 cmd
->se_tfo
->get_task_tag(cmd
));
1775 * No tasks remain in the execution queue
1777 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1778 list_for_each_entry_safe(task
, task_tmp
,
1779 &cmd
->t_task_list
, t_list
) {
1780 pr_debug("Processing task %p\n", task
);
1782 * If the struct se_task has not been sent and is not active,
1783 * remove the struct se_task from the execution queue.
1785 if (!(task
->task_flags
& (TF_ACTIVE
| TF_SENT
))) {
1786 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1788 transport_remove_task_from_execute_queue(task
,
1791 pr_debug("Task %p removed from execute queue\n", task
);
1792 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1797 * If the struct se_task is active, sleep until it is returned
1800 if (task
->task_flags
& TF_ACTIVE
) {
1801 task
->task_flags
|= TF_REQUEST_STOP
;
1802 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1805 pr_debug("Task %p waiting to complete\n", task
);
1806 wait_for_completion(&task
->task_stop_comp
);
1807 pr_debug("Task %p stopped successfully\n", task
);
1809 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1810 atomic_dec(&cmd
->t_task_cdbs_left
);
1811 task
->task_flags
&= ~(TF_ACTIVE
| TF_REQUEST_STOP
);
1813 pr_debug("Task %p - did nothing\n", task
);
1817 __transport_stop_task_timer(task
, &flags
);
1819 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1825 * Handle SAM-esque emulation for generic transport request failures.
1827 static void transport_generic_request_failure(
1829 struct se_device
*dev
,
1835 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1836 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1837 cmd
->t_task_cdb
[0]);
1838 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1839 " %d/%d transport_error_status: %d\n",
1840 cmd
->se_tfo
->get_cmd_state(cmd
),
1841 cmd
->t_state
, cmd
->deferred_t_state
,
1842 cmd
->transport_error_status
);
1843 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1844 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1845 " t_transport_active: %d t_transport_stop: %d"
1846 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1847 atomic_read(&cmd
->t_task_cdbs_left
),
1848 atomic_read(&cmd
->t_task_cdbs_sent
),
1849 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1850 atomic_read(&cmd
->t_transport_active
),
1851 atomic_read(&cmd
->t_transport_stop
),
1852 atomic_read(&cmd
->t_transport_sent
));
1854 transport_stop_all_task_timers(cmd
);
1857 atomic_inc(&dev
->depth_left
);
1859 * For SAM Task Attribute emulation for failed struct se_cmd
1861 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1862 transport_complete_task_attr(cmd
);
1865 transport_direct_request_timeout(cmd
);
1866 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
1869 switch (cmd
->transport_error_status
) {
1870 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
1871 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1873 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
1874 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
1876 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
1877 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1879 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
1880 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
1882 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
1884 transport_new_cmd_failure(cmd
);
1886 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1887 * we force this session to fall back to session
1890 cmd
->se_tfo
->fall_back_to_erl0(cmd
->se_sess
);
1891 cmd
->se_tfo
->stop_session(cmd
->se_sess
, 0, 0);
1894 case PYX_TRANSPORT_LU_COMM_FAILURE
:
1895 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
1896 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1898 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
1899 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
1901 case PYX_TRANSPORT_WRITE_PROTECTED
:
1902 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
1904 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
1906 * No SENSE Data payload for this case, set SCSI Status
1907 * and queue the response to $FABRIC_MOD.
1909 * Uses linux/include/scsi/scsi.h SAM status codes defs
1911 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1913 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1914 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1917 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1920 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1921 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1922 cmd
->orig_fe_lun
, 0x2C,
1923 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1925 ret
= cmd
->se_tfo
->queue_status(cmd
);
1929 case PYX_TRANSPORT_USE_SENSE_REASON
:
1931 * struct se_cmd->scsi_sense_reason already set
1935 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1937 cmd
->transport_error_status
);
1938 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1942 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1943 * make the call to transport_send_check_condition_and_sense()
1944 * directly. Otherwise expect the fabric to make the call to
1945 * transport_send_check_condition_and_sense() after handling
1946 * possible unsoliticied write data payloads.
1948 if (!sc
&& !cmd
->se_tfo
->new_cmd_map
)
1949 transport_new_cmd_failure(cmd
);
1951 ret
= transport_send_check_condition_and_sense(cmd
,
1952 cmd
->scsi_sense_reason
, 0);
1958 transport_lun_remove_cmd(cmd
);
1959 if (!transport_cmd_check_stop_to_fabric(cmd
))
1964 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1965 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1968 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
1970 unsigned long flags
;
1972 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1973 if (!atomic_read(&cmd
->t_transport_timeout
)) {
1974 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1977 if (atomic_read(&cmd
->t_task_cdbs_timeout_left
)) {
1978 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1982 atomic_sub(atomic_read(&cmd
->t_transport_timeout
),
1984 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1987 static void transport_generic_request_timeout(struct se_cmd
*cmd
)
1989 unsigned long flags
;
1992 * Reset cmd->t_se_count to allow transport_put_cmd()
1993 * to allow last call to free memory resources.
1995 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1996 if (atomic_read(&cmd
->t_transport_timeout
) > 1) {
1997 int tmp
= (atomic_read(&cmd
->t_transport_timeout
) - 1);
1999 atomic_sub(tmp
, &cmd
->t_se_count
);
2001 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2003 transport_put_cmd(cmd
);
2006 static inline u32
transport_lba_21(unsigned char *cdb
)
2008 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2011 static inline u32
transport_lba_32(unsigned char *cdb
)
2013 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2016 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2018 unsigned int __v1
, __v2
;
2020 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2021 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2023 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2027 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2029 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2031 unsigned int __v1
, __v2
;
2033 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2034 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2036 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2039 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2041 unsigned long flags
;
2043 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2044 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2045 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2049 * Called from interrupt context.
2051 static void transport_task_timeout_handler(unsigned long data
)
2053 struct se_task
*task
= (struct se_task
*)data
;
2054 struct se_cmd
*cmd
= task
->task_se_cmd
;
2055 unsigned long flags
;
2057 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2059 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2060 if (task
->task_flags
& TF_TIMER_STOP
) {
2061 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2064 task
->task_flags
&= ~TF_TIMER_RUNNING
;
2067 * Determine if transport_complete_task() has already been called.
2069 if (!(task
->task_flags
& TF_ACTIVE
)) {
2070 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2072 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2076 atomic_inc(&cmd
->t_se_count
);
2077 atomic_inc(&cmd
->t_transport_timeout
);
2078 cmd
->t_tasks_failed
= 1;
2080 task
->task_flags
|= TF_TIMEOUT
;
2081 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2082 task
->task_scsi_status
= 1;
2084 if (task
->task_flags
& TF_REQUEST_STOP
) {
2085 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2086 " == 1\n", task
, cmd
);
2087 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2088 complete(&task
->task_stop_comp
);
2092 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
2093 pr_debug("transport task: %p cmd: %p timeout non zero"
2094 " t_task_cdbs_left\n", task
, cmd
);
2095 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2098 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2101 cmd
->t_state
= TRANSPORT_COMPLETE_FAILURE
;
2102 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2104 transport_add_cmd_to_queue(cmd
, TRANSPORT_COMPLETE_FAILURE
, false);
2108 * Called with cmd->t_state_lock held.
2110 static void transport_start_task_timer(struct se_task
*task
)
2112 struct se_device
*dev
= task
->task_se_cmd
->se_dev
;
2115 if (task
->task_flags
& TF_TIMER_RUNNING
)
2118 * If the task_timeout is disabled, exit now.
2120 timeout
= dev
->se_sub_dev
->se_dev_attrib
.task_timeout
;
2124 init_timer(&task
->task_timer
);
2125 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2126 task
->task_timer
.data
= (unsigned long) task
;
2127 task
->task_timer
.function
= transport_task_timeout_handler
;
2129 task
->task_flags
|= TF_TIMER_RUNNING
;
2130 add_timer(&task
->task_timer
);
2132 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2133 " %d\n", task
->task_se_cmd
, task
, timeout
);
2138 * Called with spin_lock_irq(&cmd->t_state_lock) held.
2140 void __transport_stop_task_timer(struct se_task
*task
, unsigned long *flags
)
2142 struct se_cmd
*cmd
= task
->task_se_cmd
;
2144 if (!(task
->task_flags
& TF_TIMER_RUNNING
))
2147 task
->task_flags
|= TF_TIMER_STOP
;
2148 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
2150 del_timer_sync(&task
->task_timer
);
2152 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
2153 task
->task_flags
&= ~TF_TIMER_RUNNING
;
2154 task
->task_flags
&= ~TF_TIMER_STOP
;
2157 static void transport_stop_all_task_timers(struct se_cmd
*cmd
)
2159 struct se_task
*task
= NULL
, *task_tmp
;
2160 unsigned long flags
;
2162 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2163 list_for_each_entry_safe(task
, task_tmp
,
2164 &cmd
->t_task_list
, t_list
)
2165 __transport_stop_task_timer(task
, &flags
);
2166 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2169 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2171 if (dev
->dev_tcq_window_closed
++ <
2172 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2173 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2175 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2177 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
2182 * Called from Fabric Module context from transport_execute_tasks()
2184 * The return of this function determins if the tasks from struct se_cmd
2185 * get added to the execution queue in transport_execute_tasks(),
2186 * or are added to the delayed or ordered lists here.
2188 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2190 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2193 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2194 * to allow the passed struct se_cmd list of tasks to the front of the list.
2196 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2197 atomic_inc(&cmd
->se_dev
->dev_hoq_count
);
2198 smp_mb__after_atomic_inc();
2199 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2200 " 0x%02x, se_ordered_id: %u\n",
2202 cmd
->se_ordered_id
);
2204 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2205 spin_lock(&cmd
->se_dev
->ordered_cmd_lock
);
2206 list_add_tail(&cmd
->se_ordered_node
,
2207 &cmd
->se_dev
->ordered_cmd_list
);
2208 spin_unlock(&cmd
->se_dev
->ordered_cmd_lock
);
2210 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2211 smp_mb__after_atomic_inc();
2213 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2214 " list, se_ordered_id: %u\n",
2216 cmd
->se_ordered_id
);
2218 * Add ORDERED command to tail of execution queue if
2219 * no other older commands exist that need to be
2222 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2226 * For SIMPLE and UNTAGGED Task Attribute commands
2228 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2229 smp_mb__after_atomic_inc();
2232 * Otherwise if one or more outstanding ORDERED task attribute exist,
2233 * add the dormant task(s) built for the passed struct se_cmd to the
2234 * execution queue and become in Active state for this struct se_device.
2236 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2238 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2239 * will be drained upon completion of HEAD_OF_QUEUE task.
2241 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2242 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2243 list_add_tail(&cmd
->se_delayed_node
,
2244 &cmd
->se_dev
->delayed_cmd_list
);
2245 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2247 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2248 " delayed CMD list, se_ordered_id: %u\n",
2249 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2250 cmd
->se_ordered_id
);
2252 * Return zero to let transport_execute_tasks() know
2253 * not to add the delayed tasks to the execution list.
2258 * Otherwise, no ORDERED task attributes exist..
2264 * Called from fabric module context in transport_generic_new_cmd() and
2265 * transport_generic_process_write()
2267 static int transport_execute_tasks(struct se_cmd
*cmd
)
2271 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2272 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2273 transport_generic_request_failure(cmd
, NULL
, 0, 1);
2278 * Call transport_cmd_check_stop() to see if a fabric exception
2279 * has occurred that prevents execution.
2281 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2283 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2284 * attribute for the tasks of the received struct se_cmd CDB
2286 add_tasks
= transport_execute_task_attr(cmd
);
2290 * This calls transport_add_tasks_from_cmd() to handle
2291 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2292 * (if enabled) in __transport_add_task_to_execute_queue() and
2293 * transport_add_task_check_sam_attr().
2295 transport_add_tasks_from_cmd(cmd
);
2298 * Kick the execution queue for the cmd associated struct se_device
2302 __transport_execute_tasks(cmd
->se_dev
);
2307 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2308 * from struct se_device->execute_task_list and
2310 * Called from transport_processing_thread()
2312 static int __transport_execute_tasks(struct se_device
*dev
)
2315 struct se_cmd
*cmd
= NULL
;
2316 struct se_task
*task
= NULL
;
2317 unsigned long flags
;
2320 * Check if there is enough room in the device and HBA queue to send
2321 * struct se_tasks to the selected transport.
2324 if (!atomic_read(&dev
->depth_left
))
2325 return transport_tcq_window_closed(dev
);
2327 dev
->dev_tcq_window_closed
= 0;
2329 spin_lock_irq(&dev
->execute_task_lock
);
2330 if (list_empty(&dev
->execute_task_list
)) {
2331 spin_unlock_irq(&dev
->execute_task_lock
);
2334 task
= list_first_entry(&dev
->execute_task_list
,
2335 struct se_task
, t_execute_list
);
2336 __transport_remove_task_from_execute_queue(task
, dev
);
2337 spin_unlock_irq(&dev
->execute_task_lock
);
2339 atomic_dec(&dev
->depth_left
);
2341 cmd
= task
->task_se_cmd
;
2343 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2344 task
->task_flags
|= (TF_ACTIVE
| TF_SENT
);
2345 atomic_inc(&cmd
->t_task_cdbs_sent
);
2347 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2348 cmd
->t_task_list_num
)
2349 atomic_set(&cmd
->transport_sent
, 1);
2351 transport_start_task_timer(task
);
2352 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2354 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2355 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2356 * struct se_subsystem_api->do_task() caller below.
2358 if (cmd
->transport_emulate_cdb
) {
2359 error
= cmd
->transport_emulate_cdb(cmd
);
2361 cmd
->transport_error_status
= error
;
2362 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2363 task
->task_flags
&= ~TF_ACTIVE
;
2364 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2365 atomic_set(&cmd
->transport_sent
, 0);
2366 transport_stop_tasks_for_cmd(cmd
);
2367 transport_generic_request_failure(cmd
, dev
, 0, 1);
2371 * Handle the successful completion for transport_emulate_cdb()
2372 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2373 * Otherwise the caller is expected to complete the task with
2376 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2377 cmd
->scsi_status
= SAM_STAT_GOOD
;
2378 task
->task_scsi_status
= GOOD
;
2379 transport_complete_task(task
, 1);
2383 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2384 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2385 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2386 * LUN emulation code.
2388 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2389 * call ->do_task() directly and let the underlying TCM subsystem plugin
2390 * code handle the CDB emulation.
2392 if ((dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2393 (!(task
->task_se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2394 error
= transport_emulate_control_cdb(task
);
2396 error
= dev
->transport
->do_task(task
);
2399 cmd
->transport_error_status
= error
;
2400 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2401 task
->task_flags
&= ~TF_ACTIVE
;
2402 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2403 atomic_set(&cmd
->transport_sent
, 0);
2404 transport_stop_tasks_for_cmd(cmd
);
2405 transport_generic_request_failure(cmd
, dev
, 0, 1);
2414 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2416 unsigned long flags
;
2418 * Any unsolicited data will get dumped for failed command inside of
2421 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2422 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2423 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2424 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2427 static inline u32
transport_get_sectors_6(
2432 struct se_device
*dev
= cmd
->se_dev
;
2435 * Assume TYPE_DISK for non struct se_device objects.
2436 * Use 8-bit sector value.
2442 * Use 24-bit allocation length for TYPE_TAPE.
2444 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2445 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2448 * Everything else assume TYPE_DISK Sector CDB location.
2449 * Use 8-bit sector value.
2455 static inline u32
transport_get_sectors_10(
2460 struct se_device
*dev
= cmd
->se_dev
;
2463 * Assume TYPE_DISK for non struct se_device objects.
2464 * Use 16-bit sector value.
2470 * XXX_10 is not defined in SSC, throw an exception
2472 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2478 * Everything else assume TYPE_DISK Sector CDB location.
2479 * Use 16-bit sector value.
2482 return (u32
)(cdb
[7] << 8) + cdb
[8];
2485 static inline u32
transport_get_sectors_12(
2490 struct se_device
*dev
= cmd
->se_dev
;
2493 * Assume TYPE_DISK for non struct se_device objects.
2494 * Use 32-bit sector value.
2500 * XXX_12 is not defined in SSC, throw an exception
2502 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2508 * Everything else assume TYPE_DISK Sector CDB location.
2509 * Use 32-bit sector value.
2512 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2515 static inline u32
transport_get_sectors_16(
2520 struct se_device
*dev
= cmd
->se_dev
;
2523 * Assume TYPE_DISK for non struct se_device objects.
2524 * Use 32-bit sector value.
2530 * Use 24-bit allocation length for TYPE_TAPE.
2532 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2533 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2536 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2537 (cdb
[12] << 8) + cdb
[13];
2541 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2543 static inline u32
transport_get_sectors_32(
2549 * Assume TYPE_DISK for non struct se_device objects.
2550 * Use 32-bit sector value.
2552 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2553 (cdb
[30] << 8) + cdb
[31];
2557 static inline u32
transport_get_size(
2562 struct se_device
*dev
= cmd
->se_dev
;
2564 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2565 if (cdb
[1] & 1) { /* sectors */
2566 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2571 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2572 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2573 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2574 dev
->transport
->name
);
2576 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2579 static void transport_xor_callback(struct se_cmd
*cmd
)
2581 unsigned char *buf
, *addr
;
2582 struct scatterlist
*sg
;
2583 unsigned int offset
;
2587 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2589 * 1) read the specified logical block(s);
2590 * 2) transfer logical blocks from the data-out buffer;
2591 * 3) XOR the logical blocks transferred from the data-out buffer with
2592 * the logical blocks read, storing the resulting XOR data in a buffer;
2593 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2594 * blocks transferred from the data-out buffer; and
2595 * 5) transfer the resulting XOR data to the data-in buffer.
2597 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2599 pr_err("Unable to allocate xor_callback buf\n");
2603 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2604 * into the locally allocated *buf
2606 sg_copy_to_buffer(cmd
->t_data_sg
,
2612 * Now perform the XOR against the BIDI read memory located at
2613 * cmd->t_mem_bidi_list
2617 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2618 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2622 for (i
= 0; i
< sg
->length
; i
++)
2623 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2625 offset
+= sg
->length
;
2626 kunmap_atomic(addr
, KM_USER0
);
2634 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2636 static int transport_get_sense_data(struct se_cmd
*cmd
)
2638 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2639 struct se_device
*dev
= cmd
->se_dev
;
2640 struct se_task
*task
= NULL
, *task_tmp
;
2641 unsigned long flags
;
2644 WARN_ON(!cmd
->se_lun
);
2649 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2650 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2651 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2655 list_for_each_entry_safe(task
, task_tmp
,
2656 &cmd
->t_task_list
, t_list
) {
2657 if (!task
->task_sense
)
2660 if (!dev
->transport
->get_sense_buffer
) {
2661 pr_err("dev->transport->get_sense_buffer"
2666 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2667 if (!sense_buffer
) {
2668 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2669 " sense buffer for task with sense\n",
2670 cmd
->se_tfo
->get_task_tag(cmd
), task
);
2673 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2675 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2676 TRANSPORT_SENSE_BUFFER
);
2678 memcpy(&buffer
[offset
], sense_buffer
,
2679 TRANSPORT_SENSE_BUFFER
);
2680 cmd
->scsi_status
= task
->task_scsi_status
;
2681 /* Automatically padded */
2682 cmd
->scsi_sense_length
=
2683 (TRANSPORT_SENSE_BUFFER
+ offset
);
2685 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2687 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2691 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2697 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
2699 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2700 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2701 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2703 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2704 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2707 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2710 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2711 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2712 cmd
->orig_fe_lun
, 0x2C,
2713 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2717 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2719 return dev
->transport
->get_blocks(dev
) + 1;
2722 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2724 struct se_device
*dev
= cmd
->se_dev
;
2727 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2730 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2732 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2733 pr_err("LBA: %llu Sectors: %u exceeds"
2734 " transport_dev_end_lba(): %llu\n",
2735 cmd
->t_task_lba
, sectors
,
2736 transport_dev_end_lba(dev
));
2743 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2746 * Determine if the received WRITE_SAME is used to for direct
2747 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2748 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2749 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2751 int passthrough
= (dev
->transport
->transport_type
==
2752 TRANSPORT_PLUGIN_PHBA_PDEV
);
2755 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2756 pr_err("WRITE_SAME PBDATA and LBDATA"
2757 " bits not supported for Block Discard"
2762 * Currently for the emulated case we only accept
2763 * tpws with the UNMAP=1 bit set.
2765 if (!(flags
[0] & 0x08)) {
2766 pr_err("WRITE_SAME w/o UNMAP bit not"
2767 " supported for Block Discard Emulation\n");
2775 /* transport_generic_cmd_sequencer():
2777 * Generic Command Sequencer that should work for most DAS transport
2780 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2783 * FIXME: Need to support other SCSI OPCODES where as well.
2785 static int transport_generic_cmd_sequencer(
2789 struct se_device
*dev
= cmd
->se_dev
;
2790 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2791 int ret
= 0, sector_ret
= 0, passthrough
;
2792 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2796 * Check for an existing UNIT ATTENTION condition
2798 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2799 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2800 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2804 * Check status of Asymmetric Logical Unit Assignment port
2806 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2809 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2810 * The ALUA additional sense code qualifier (ASCQ) is determined
2811 * by the ALUA primary or secondary access state..
2815 pr_debug("[%s]: ALUA TG Port not available,"
2816 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2817 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2819 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2820 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2821 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2824 goto out_invalid_cdb_field
;
2827 * Check status for SPC-3 Persistent Reservations
2829 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2830 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2831 cmd
, cdb
, pr_reg_type
) != 0)
2832 return transport_handle_reservation_conflict(cmd
);
2834 * This means the CDB is allowed for the SCSI Initiator port
2835 * when said port is *NOT* holding the legacy SPC-2 or
2836 * SPC-3 Persistent Reservation.
2842 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2844 goto out_unsupported_cdb
;
2845 size
= transport_get_size(sectors
, cdb
, cmd
);
2846 cmd
->t_task_lba
= transport_lba_21(cdb
);
2847 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2850 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2852 goto out_unsupported_cdb
;
2853 size
= transport_get_size(sectors
, cdb
, cmd
);
2854 cmd
->t_task_lba
= transport_lba_32(cdb
);
2855 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2858 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2860 goto out_unsupported_cdb
;
2861 size
= transport_get_size(sectors
, cdb
, cmd
);
2862 cmd
->t_task_lba
= transport_lba_32(cdb
);
2863 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2866 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2868 goto out_unsupported_cdb
;
2869 size
= transport_get_size(sectors
, cdb
, cmd
);
2870 cmd
->t_task_lba
= transport_lba_64(cdb
);
2871 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2874 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2876 goto out_unsupported_cdb
;
2877 size
= transport_get_size(sectors
, cdb
, cmd
);
2878 cmd
->t_task_lba
= transport_lba_21(cdb
);
2879 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2882 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2884 goto out_unsupported_cdb
;
2885 size
= transport_get_size(sectors
, cdb
, cmd
);
2886 cmd
->t_task_lba
= transport_lba_32(cdb
);
2887 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2888 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2891 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2893 goto out_unsupported_cdb
;
2894 size
= transport_get_size(sectors
, cdb
, cmd
);
2895 cmd
->t_task_lba
= transport_lba_32(cdb
);
2896 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2897 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2900 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2902 goto out_unsupported_cdb
;
2903 size
= transport_get_size(sectors
, cdb
, cmd
);
2904 cmd
->t_task_lba
= transport_lba_64(cdb
);
2905 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2906 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2908 case XDWRITEREAD_10
:
2909 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2910 !(cmd
->t_tasks_bidi
))
2911 goto out_invalid_cdb_field
;
2912 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2914 goto out_unsupported_cdb
;
2915 size
= transport_get_size(sectors
, cdb
, cmd
);
2916 cmd
->t_task_lba
= transport_lba_32(cdb
);
2917 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2918 passthrough
= (dev
->transport
->transport_type
==
2919 TRANSPORT_PLUGIN_PHBA_PDEV
);
2921 * Skip the remaining assignments for TCM/PSCSI passthrough
2926 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2928 cmd
->transport_complete_callback
= &transport_xor_callback
;
2929 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2931 case VARIABLE_LENGTH_CMD
:
2932 service_action
= get_unaligned_be16(&cdb
[8]);
2934 * Determine if this is TCM/PSCSI device and we should disable
2935 * internal emulation for this CDB.
2937 passthrough
= (dev
->transport
->transport_type
==
2938 TRANSPORT_PLUGIN_PHBA_PDEV
);
2940 switch (service_action
) {
2941 case XDWRITEREAD_32
:
2942 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2944 goto out_unsupported_cdb
;
2945 size
= transport_get_size(sectors
, cdb
, cmd
);
2947 * Use WRITE_32 and READ_32 opcodes for the emulated
2948 * XDWRITE_READ_32 logic.
2950 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2951 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2954 * Skip the remaining assignments for TCM/PSCSI passthrough
2960 * Setup BIDI XOR callback to be run during
2961 * transport_generic_complete_ok()
2963 cmd
->transport_complete_callback
= &transport_xor_callback
;
2964 cmd
->t_tasks_fua
= (cdb
[10] & 0x8);
2967 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2969 goto out_unsupported_cdb
;
2972 size
= transport_get_size(1, cdb
, cmd
);
2974 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2976 goto out_invalid_cdb_field
;
2979 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2980 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2982 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2983 goto out_invalid_cdb_field
;
2987 pr_err("VARIABLE_LENGTH_CMD service action"
2988 " 0x%04x not supported\n", service_action
);
2989 goto out_unsupported_cdb
;
2992 case MAINTENANCE_IN
:
2993 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2994 /* MAINTENANCE_IN from SCC-2 */
2996 * Check for emulated MI_REPORT_TARGET_PGS.
2998 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
2999 cmd
->transport_emulate_cdb
=
3000 (su_dev
->t10_alua
.alua_type
==
3001 SPC3_ALUA_EMULATED
) ?
3002 core_emulate_report_target_port_groups
:
3005 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3006 (cdb
[8] << 8) | cdb
[9];
3008 /* GPCMD_SEND_KEY from multi media commands */
3009 size
= (cdb
[8] << 8) + cdb
[9];
3011 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3015 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3017 case MODE_SELECT_10
:
3018 size
= (cdb
[7] << 8) + cdb
[8];
3019 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3023 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3026 case GPCMD_READ_BUFFER_CAPACITY
:
3027 case GPCMD_SEND_OPC
:
3030 size
= (cdb
[7] << 8) + cdb
[8];
3031 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3033 case READ_BLOCK_LIMITS
:
3034 size
= READ_BLOCK_LEN
;
3035 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3037 case GPCMD_GET_CONFIGURATION
:
3038 case GPCMD_READ_FORMAT_CAPACITIES
:
3039 case GPCMD_READ_DISC_INFO
:
3040 case GPCMD_READ_TRACK_RZONE_INFO
:
3041 size
= (cdb
[7] << 8) + cdb
[8];
3042 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3044 case PERSISTENT_RESERVE_IN
:
3045 case PERSISTENT_RESERVE_OUT
:
3046 cmd
->transport_emulate_cdb
=
3047 (su_dev
->t10_pr
.res_type
==
3048 SPC3_PERSISTENT_RESERVATIONS
) ?
3049 core_scsi3_emulate_pr
: NULL
;
3050 size
= (cdb
[7] << 8) + cdb
[8];
3051 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3053 case GPCMD_MECHANISM_STATUS
:
3054 case GPCMD_READ_DVD_STRUCTURE
:
3055 size
= (cdb
[8] << 8) + cdb
[9];
3056 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3059 size
= READ_POSITION_LEN
;
3060 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3062 case MAINTENANCE_OUT
:
3063 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3064 /* MAINTENANCE_OUT from SCC-2
3066 * Check for emulated MO_SET_TARGET_PGS.
3068 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3069 cmd
->transport_emulate_cdb
=
3070 (su_dev
->t10_alua
.alua_type
==
3071 SPC3_ALUA_EMULATED
) ?
3072 core_emulate_set_target_port_groups
:
3076 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3077 (cdb
[8] << 8) | cdb
[9];
3079 /* GPCMD_REPORT_KEY from multi media commands */
3080 size
= (cdb
[8] << 8) + cdb
[9];
3082 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3085 size
= (cdb
[3] << 8) + cdb
[4];
3087 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3088 * See spc4r17 section 5.3
3090 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3091 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3092 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3095 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3096 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3099 size
= READ_CAP_LEN
;
3100 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3102 case READ_MEDIA_SERIAL_NUMBER
:
3103 case SECURITY_PROTOCOL_IN
:
3104 case SECURITY_PROTOCOL_OUT
:
3105 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3106 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3108 case SERVICE_ACTION_IN
:
3109 case ACCESS_CONTROL_IN
:
3110 case ACCESS_CONTROL_OUT
:
3112 case READ_ATTRIBUTE
:
3113 case RECEIVE_COPY_RESULTS
:
3114 case WRITE_ATTRIBUTE
:
3115 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3116 (cdb
[12] << 8) | cdb
[13];
3117 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3119 case RECEIVE_DIAGNOSTIC
:
3120 case SEND_DIAGNOSTIC
:
3121 size
= (cdb
[3] << 8) | cdb
[4];
3122 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3124 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3127 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3128 size
= (2336 * sectors
);
3129 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3134 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3138 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3140 case READ_ELEMENT_STATUS
:
3141 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3142 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3145 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3146 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3151 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3152 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3154 if (cdb
[0] == RESERVE_10
)
3155 size
= (cdb
[7] << 8) | cdb
[8];
3157 size
= cmd
->data_length
;
3160 * Setup the legacy emulated handler for SPC-2 and
3161 * >= SPC-3 compatible reservation handling (CRH=1)
3162 * Otherwise, we assume the underlying SCSI logic is
3163 * is running in SPC_PASSTHROUGH, and wants reservations
3164 * emulation disabled.
3166 cmd
->transport_emulate_cdb
=
3167 (su_dev
->t10_pr
.res_type
!=
3169 core_scsi2_emulate_crh
: NULL
;
3170 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3175 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3176 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3178 if (cdb
[0] == RELEASE_10
)
3179 size
= (cdb
[7] << 8) | cdb
[8];
3181 size
= cmd
->data_length
;
3183 cmd
->transport_emulate_cdb
=
3184 (su_dev
->t10_pr
.res_type
!=
3186 core_scsi2_emulate_crh
: NULL
;
3187 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3189 case SYNCHRONIZE_CACHE
:
3190 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3192 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3194 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3195 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3196 cmd
->t_task_lba
= transport_lba_32(cdb
);
3198 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3199 cmd
->t_task_lba
= transport_lba_64(cdb
);
3202 goto out_unsupported_cdb
;
3204 size
= transport_get_size(sectors
, cdb
, cmd
);
3205 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3208 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3210 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3213 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3214 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3216 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3218 * Check to ensure that LBA + Range does not exceed past end of
3219 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3221 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
3222 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3223 goto out_invalid_cdb_field
;
3227 size
= get_unaligned_be16(&cdb
[7]);
3228 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3231 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3233 goto out_unsupported_cdb
;
3236 size
= transport_get_size(1, cdb
, cmd
);
3238 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3239 goto out_invalid_cdb_field
;
3242 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
3243 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3245 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3246 goto out_invalid_cdb_field
;
3249 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3251 goto out_unsupported_cdb
;
3254 size
= transport_get_size(1, cdb
, cmd
);
3256 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3257 goto out_invalid_cdb_field
;
3260 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3261 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3263 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3264 * of byte 1 bit 3 UNMAP instead of original reserved field
3266 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3267 goto out_invalid_cdb_field
;
3269 case ALLOW_MEDIUM_REMOVAL
:
3270 case GPCMD_CLOSE_TRACK
:
3272 case INITIALIZE_ELEMENT_STATUS
:
3273 case GPCMD_LOAD_UNLOAD
:
3276 case GPCMD_SET_SPEED
:
3279 case TEST_UNIT_READY
:
3281 case WRITE_FILEMARKS
:
3283 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3286 cmd
->transport_emulate_cdb
=
3287 transport_core_report_lun_response
;
3288 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3290 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3291 * See spc4r17 section 5.3
3293 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3294 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3295 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3298 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3299 " 0x%02x, sending CHECK_CONDITION.\n",
3300 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3301 goto out_unsupported_cdb
;
3304 if (size
!= cmd
->data_length
) {
3305 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3306 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3307 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3308 cmd
->data_length
, size
, cdb
[0]);
3310 cmd
->cmd_spdtl
= size
;
3312 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3313 pr_err("Rejecting underflow/overflow"
3315 goto out_invalid_cdb_field
;
3318 * Reject READ_* or WRITE_* with overflow/underflow for
3319 * type SCF_SCSI_DATA_SG_IO_CDB.
3321 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3322 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3323 " CDB on non 512-byte sector setup subsystem"
3324 " plugin: %s\n", dev
->transport
->name
);
3325 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3326 goto out_invalid_cdb_field
;
3329 if (size
> cmd
->data_length
) {
3330 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3331 cmd
->residual_count
= (size
- cmd
->data_length
);
3333 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3334 cmd
->residual_count
= (cmd
->data_length
- size
);
3336 cmd
->data_length
= size
;
3339 /* Let's limit control cdbs to a page, for simplicity's sake. */
3340 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3342 goto out_invalid_cdb_field
;
3344 transport_set_supported_SAM_opcode(cmd
);
3347 out_unsupported_cdb
:
3348 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3349 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3351 out_invalid_cdb_field
:
3352 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3353 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3358 * Called from transport_generic_complete_ok() and
3359 * transport_generic_request_failure() to determine which dormant/delayed
3360 * and ordered cmds need to have their tasks added to the execution queue.
3362 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3364 struct se_device
*dev
= cmd
->se_dev
;
3365 struct se_cmd
*cmd_p
, *cmd_tmp
;
3366 int new_active_tasks
= 0;
3368 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3369 atomic_dec(&dev
->simple_cmds
);
3370 smp_mb__after_atomic_dec();
3371 dev
->dev_cur_ordered_id
++;
3372 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3373 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3374 cmd
->se_ordered_id
);
3375 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3376 atomic_dec(&dev
->dev_hoq_count
);
3377 smp_mb__after_atomic_dec();
3378 dev
->dev_cur_ordered_id
++;
3379 pr_debug("Incremented dev_cur_ordered_id: %u for"
3380 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3381 cmd
->se_ordered_id
);
3382 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3383 spin_lock(&dev
->ordered_cmd_lock
);
3384 list_del(&cmd
->se_ordered_node
);
3385 atomic_dec(&dev
->dev_ordered_sync
);
3386 smp_mb__after_atomic_dec();
3387 spin_unlock(&dev
->ordered_cmd_lock
);
3389 dev
->dev_cur_ordered_id
++;
3390 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3391 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3394 * Process all commands up to the last received
3395 * ORDERED task attribute which requires another blocking
3398 spin_lock(&dev
->delayed_cmd_lock
);
3399 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3400 &dev
->delayed_cmd_list
, se_delayed_node
) {
3402 list_del(&cmd_p
->se_delayed_node
);
3403 spin_unlock(&dev
->delayed_cmd_lock
);
3405 pr_debug("Calling add_tasks() for"
3406 " cmd_p: 0x%02x Task Attr: 0x%02x"
3407 " Dormant -> Active, se_ordered_id: %u\n",
3408 cmd_p
->t_task_cdb
[0],
3409 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3411 transport_add_tasks_from_cmd(cmd_p
);
3414 spin_lock(&dev
->delayed_cmd_lock
);
3415 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3418 spin_unlock(&dev
->delayed_cmd_lock
);
3420 * If new tasks have become active, wake up the transport thread
3421 * to do the processing of the Active tasks.
3423 if (new_active_tasks
!= 0)
3424 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3427 static void transport_complete_qf(struct se_cmd
*cmd
)
3431 transport_stop_all_task_timers(cmd
);
3432 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3433 transport_complete_task_attr(cmd
);
3435 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3436 ret
= cmd
->se_tfo
->queue_status(cmd
);
3441 switch (cmd
->data_direction
) {
3442 case DMA_FROM_DEVICE
:
3443 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3446 if (cmd
->t_bidi_data_sg
) {
3447 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3451 /* Fall through for DMA_TO_DEVICE */
3453 ret
= cmd
->se_tfo
->queue_status(cmd
);
3461 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3464 transport_lun_remove_cmd(cmd
);
3465 transport_cmd_check_stop_to_fabric(cmd
);
3468 static void transport_handle_queue_full(
3470 struct se_device
*dev
)
3472 spin_lock_irq(&dev
->qf_cmd_lock
);
3473 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3474 atomic_inc(&dev
->dev_qf_count
);
3475 smp_mb__after_atomic_inc();
3476 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3478 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3481 static void transport_generic_complete_ok(struct se_cmd
*cmd
)
3483 int reason
= 0, ret
;
3485 * Check if we need to move delayed/dormant tasks from cmds on the
3486 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3489 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3490 transport_complete_task_attr(cmd
);
3492 * Check to schedule QUEUE_FULL work, or execute an existing
3493 * cmd->transport_qf_callback()
3495 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3496 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3499 * Check if we need to retrieve a sense buffer from
3500 * the struct se_cmd in question.
3502 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3503 if (transport_get_sense_data(cmd
) < 0)
3504 reason
= TCM_NON_EXISTENT_LUN
;
3507 * Only set when an struct se_task->task_scsi_status returned
3508 * a non GOOD status.
3510 if (cmd
->scsi_status
) {
3511 ret
= transport_send_check_condition_and_sense(
3516 transport_lun_remove_cmd(cmd
);
3517 transport_cmd_check_stop_to_fabric(cmd
);
3522 * Check for a callback, used by amongst other things
3523 * XDWRITE_READ_10 emulation.
3525 if (cmd
->transport_complete_callback
)
3526 cmd
->transport_complete_callback(cmd
);
3528 switch (cmd
->data_direction
) {
3529 case DMA_FROM_DEVICE
:
3530 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3531 if (cmd
->se_lun
->lun_sep
) {
3532 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3535 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3537 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3542 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3543 if (cmd
->se_lun
->lun_sep
) {
3544 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3547 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3549 * Check if we need to send READ payload for BIDI-COMMAND
3551 if (cmd
->t_bidi_data_sg
) {
3552 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3553 if (cmd
->se_lun
->lun_sep
) {
3554 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3557 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3558 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3563 /* Fall through for DMA_TO_DEVICE */
3565 ret
= cmd
->se_tfo
->queue_status(cmd
);
3573 transport_lun_remove_cmd(cmd
);
3574 transport_cmd_check_stop_to_fabric(cmd
);
3578 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3579 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3580 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3581 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3584 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3586 struct se_task
*task
, *task_tmp
;
3587 unsigned long flags
;
3589 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3590 list_for_each_entry_safe(task
, task_tmp
,
3591 &cmd
->t_task_list
, t_list
) {
3592 if (task
->task_flags
& TF_ACTIVE
)
3595 kfree(task
->task_sg_bidi
);
3596 kfree(task
->task_sg
);
3598 list_del(&task
->t_list
);
3600 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3601 cmd
->se_dev
->transport
->free_task(task
);
3602 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3604 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3607 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3609 struct scatterlist
*sg
;
3612 for_each_sg(sgl
, sg
, nents
, count
)
3613 __free_page(sg_page(sg
));
3618 static inline void transport_free_pages(struct se_cmd
*cmd
)
3620 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3623 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3624 cmd
->t_data_sg
= NULL
;
3625 cmd
->t_data_nents
= 0;
3627 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3628 cmd
->t_bidi_data_sg
= NULL
;
3629 cmd
->t_bidi_data_nents
= 0;
3633 * transport_put_cmd - release a reference to a command
3634 * @cmd: command to release
3636 * This routine releases our reference to the command and frees it if possible.
3638 static void transport_put_cmd(struct se_cmd
*cmd
)
3640 unsigned long flags
;
3643 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3644 if (atomic_read(&cmd
->t_fe_count
)) {
3645 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3649 if (atomic_read(&cmd
->t_se_count
)) {
3650 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3654 if (atomic_read(&cmd
->transport_dev_active
)) {
3655 atomic_set(&cmd
->transport_dev_active
, 0);
3656 transport_all_task_dev_remove_state(cmd
);
3659 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3661 if (free_tasks
!= 0)
3662 transport_free_dev_tasks(cmd
);
3664 transport_free_pages(cmd
);
3665 transport_release_cmd(cmd
);
3668 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3672 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3673 * allocating in the core.
3674 * @cmd: Associated se_cmd descriptor
3675 * @mem: SGL style memory for TCM WRITE / READ
3676 * @sg_mem_num: Number of SGL elements
3677 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3678 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3680 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3683 int transport_generic_map_mem_to_cmd(
3685 struct scatterlist
*sgl
,
3687 struct scatterlist
*sgl_bidi
,
3690 if (!sgl
|| !sgl_count
)
3693 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3694 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3696 cmd
->t_data_sg
= sgl
;
3697 cmd
->t_data_nents
= sgl_count
;
3699 if (sgl_bidi
&& sgl_bidi_count
) {
3700 cmd
->t_bidi_data_sg
= sgl_bidi
;
3701 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3703 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3708 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3710 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
3712 struct se_device
*dev
= cmd
->se_dev
;
3713 int set_counts
= 1, rc
, task_cdbs
;
3716 * Setup any BIDI READ tasks and memory from
3717 * cmd->t_mem_bidi_list so the READ struct se_tasks
3718 * are queued first for the non pSCSI passthrough case.
3720 if (cmd
->t_bidi_data_sg
&&
3721 (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
3722 rc
= transport_allocate_tasks(cmd
,
3725 cmd
->t_bidi_data_sg
,
3726 cmd
->t_bidi_data_nents
);
3728 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3729 cmd
->scsi_sense_reason
=
3730 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3733 atomic_inc(&cmd
->t_fe_count
);
3734 atomic_inc(&cmd
->t_se_count
);
3738 * Setup the tasks and memory from cmd->t_mem_list
3739 * Note for BIDI transfers this will contain the WRITE payload
3741 task_cdbs
= transport_allocate_tasks(cmd
,
3743 cmd
->data_direction
,
3746 if (task_cdbs
<= 0) {
3747 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3748 cmd
->scsi_sense_reason
=
3749 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3754 atomic_inc(&cmd
->t_fe_count
);
3755 atomic_inc(&cmd
->t_se_count
);
3758 cmd
->t_task_list_num
= task_cdbs
;
3760 atomic_set(&cmd
->t_task_cdbs_left
, task_cdbs
);
3761 atomic_set(&cmd
->t_task_cdbs_ex_left
, task_cdbs
);
3762 atomic_set(&cmd
->t_task_cdbs_timeout_left
, task_cdbs
);
3766 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3768 struct scatterlist
*sg
= cmd
->t_data_sg
;
3772 * We need to take into account a possible offset here for fabrics like
3773 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3774 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3776 return kmap(sg_page(sg
)) + sg
->offset
;
3778 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3780 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3782 kunmap(sg_page(cmd
->t_data_sg
));
3784 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3787 transport_generic_get_mem(struct se_cmd
*cmd
)
3789 u32 length
= cmd
->data_length
;
3794 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3795 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3796 if (!cmd
->t_data_sg
)
3799 cmd
->t_data_nents
= nents
;
3800 sg_init_table(cmd
->t_data_sg
, nents
);
3803 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3804 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3808 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3816 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3819 kfree(cmd
->t_data_sg
);
3820 cmd
->t_data_sg
= NULL
;
3824 /* Reduce sectors if they are too long for the device */
3825 static inline sector_t
transport_limit_task_sectors(
3826 struct se_device
*dev
,
3827 unsigned long long lba
,
3830 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3832 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3833 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3834 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3841 * This function can be used by HW target mode drivers to create a linked
3842 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3843 * This is intended to be called during the completion path by TCM Core
3844 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3846 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3848 struct scatterlist
*sg_first
= NULL
;
3849 struct scatterlist
*sg_prev
= NULL
;
3850 int sg_prev_nents
= 0;
3851 struct scatterlist
*sg
;
3852 struct se_task
*task
;
3853 u32 chained_nents
= 0;
3856 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3859 * Walk the struct se_task list and setup scatterlist chains
3860 * for each contiguously allocated struct se_task->task_sg[].
3862 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3867 sg_first
= task
->task_sg
;
3868 chained_nents
= task
->task_sg_nents
;
3870 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3871 chained_nents
+= task
->task_sg_nents
;
3874 * For the padded tasks, use the extra SGL vector allocated
3875 * in transport_allocate_data_tasks() for the sg_prev_nents
3876 * offset into sg_chain() above.
3878 * We do not need the padding for the last task (or a single
3879 * task), but in that case we will never use the sg_prev_nents
3880 * value below which would be incorrect.
3882 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3883 sg_prev
= task
->task_sg
;
3886 * Setup the starting pointer and total t_tasks_sg_linked_no including
3887 * padding SGs for linking and to mark the end.
3889 cmd
->t_tasks_sg_chained
= sg_first
;
3890 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3892 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3893 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3894 cmd
->t_tasks_sg_chained_no
);
3896 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
3897 cmd
->t_tasks_sg_chained_no
, i
) {
3899 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3900 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
3901 if (sg_is_chain(sg
))
3902 pr_debug("SG: %p sg_is_chain=1\n", sg
);
3904 pr_debug("SG: %p sg_is_last=1\n", sg
);
3907 EXPORT_SYMBOL(transport_do_task_sg_chain
);
3910 * Break up cmd into chunks transport can handle
3912 static int transport_allocate_data_tasks(
3914 unsigned long long lba
,
3915 enum dma_data_direction data_direction
,
3916 struct scatterlist
*sgl
,
3917 unsigned int sgl_nents
)
3919 struct se_task
*task
;
3920 struct se_device
*dev
= cmd
->se_dev
;
3921 unsigned long flags
;
3923 sector_t sectors
, dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
3924 u32 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
3925 struct scatterlist
*sg
;
3926 struct scatterlist
*cmd_sg
;
3928 WARN_ON(cmd
->data_length
% sector_size
);
3929 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
3930 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
3933 for (i
= 0; i
< task_count
; i
++) {
3934 unsigned int task_size
, task_sg_nents_padded
;
3937 task
= transport_generic_get_task(cmd
, data_direction
);
3941 task
->task_lba
= lba
;
3942 task
->task_sectors
= min(sectors
, dev_max_sectors
);
3943 task
->task_size
= task
->task_sectors
* sector_size
;
3946 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3947 * in order to calculate the number per task SGL entries
3949 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
3951 * Check if the fabric module driver is requesting that all
3952 * struct se_task->task_sg[] be chained together.. If so,
3953 * then allocate an extra padding SG entry for linking and
3954 * marking the end of the chained SGL for every task except
3955 * the last one for (task_count > 1) operation, or skipping
3956 * the extra padding for the (task_count == 1) case.
3958 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
3959 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
3961 task_sg_nents_padded
= task
->task_sg_nents
;
3963 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
3964 task_sg_nents_padded
, GFP_KERNEL
);
3965 if (!task
->task_sg
) {
3966 cmd
->se_dev
->transport
->free_task(task
);
3970 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
3972 task_size
= task
->task_size
;
3974 /* Build new sgl, only up to task_size */
3975 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
3976 if (cmd_sg
->length
> task_size
)
3980 task_size
-= cmd_sg
->length
;
3981 cmd_sg
= sg_next(cmd_sg
);
3984 lba
+= task
->task_sectors
;
3985 sectors
-= task
->task_sectors
;
3987 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3988 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3989 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3996 transport_allocate_control_task(struct se_cmd
*cmd
)
3998 struct se_task
*task
;
3999 unsigned long flags
;
4001 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
4005 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
4007 if (!task
->task_sg
) {
4008 cmd
->se_dev
->transport
->free_task(task
);
4012 memcpy(task
->task_sg
, cmd
->t_data_sg
,
4013 sizeof(struct scatterlist
) * cmd
->t_data_nents
);
4014 task
->task_size
= cmd
->data_length
;
4015 task
->task_sg_nents
= cmd
->t_data_nents
;
4017 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4018 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4019 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4021 /* Success! Return number of tasks allocated */
4025 static u32
transport_allocate_tasks(
4027 unsigned long long lba
,
4028 enum dma_data_direction data_direction
,
4029 struct scatterlist
*sgl
,
4030 unsigned int sgl_nents
)
4032 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
4033 if (transport_cmd_get_valid_sectors(cmd
) < 0)
4036 return transport_allocate_data_tasks(cmd
, lba
, data_direction
,
4039 return transport_allocate_control_task(cmd
);
4044 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4046 * Allocate storage transport resources from a set of values predefined
4047 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4048 * Any non zero return here is treated as an "out of resource' op here.
4051 * Generate struct se_task(s) and/or their payloads for this CDB.
4053 int transport_generic_new_cmd(struct se_cmd
*cmd
)
4058 * Determine is the TCM fabric module has already allocated physical
4059 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4062 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
4064 ret
= transport_generic_get_mem(cmd
);
4069 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4070 * control or data CDB types, and perform the map to backend subsystem
4071 * code from SGL memory allocated here by transport_generic_get_mem(), or
4072 * via pre-existing SGL memory setup explictly by fabric module code with
4073 * transport_generic_map_mem_to_cmd().
4075 ret
= transport_new_cmd_obj(cmd
);
4079 * For WRITEs, let the fabric know its buffer is ready..
4080 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4081 * will be added to the struct se_device execution queue after its WRITE
4082 * data has arrived. (ie: It gets handled by the transport processing
4083 * thread a second time)
4085 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4086 transport_add_tasks_to_state_queue(cmd
);
4087 return transport_generic_write_pending(cmd
);
4090 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4091 * to the execution queue.
4093 transport_execute_tasks(cmd
);
4096 EXPORT_SYMBOL(transport_generic_new_cmd
);
4098 /* transport_generic_process_write():
4102 void transport_generic_process_write(struct se_cmd
*cmd
)
4104 transport_execute_tasks(cmd
);
4106 EXPORT_SYMBOL(transport_generic_process_write
);
4108 static void transport_write_pending_qf(struct se_cmd
*cmd
)
4110 if (cmd
->se_tfo
->write_pending(cmd
) == -EAGAIN
) {
4111 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4113 transport_handle_queue_full(cmd
, cmd
->se_dev
);
4117 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4119 unsigned long flags
;
4122 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4123 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4124 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4127 * Clear the se_cmd for WRITE_PENDING status in order to set
4128 * cmd->t_transport_active=0 so that transport_generic_handle_data
4129 * can be called from HW target mode interrupt code. This is safe
4130 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4131 * because the se_cmd->se_lun pointer is not being cleared.
4133 transport_cmd_check_stop(cmd
, 1, 0);
4136 * Call the fabric write_pending function here to let the
4137 * frontend know that WRITE buffers are ready.
4139 ret
= cmd
->se_tfo
->write_pending(cmd
);
4145 return PYX_TRANSPORT_WRITE_PENDING
;
4148 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4149 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4150 transport_handle_queue_full(cmd
, cmd
->se_dev
);
4155 * transport_release_cmd - free a command
4156 * @cmd: command to free
4158 * This routine unconditionally frees a command, and reference counting
4159 * or list removal must be done in the caller.
4161 void transport_release_cmd(struct se_cmd
*cmd
)
4163 BUG_ON(!cmd
->se_tfo
);
4165 if (cmd
->se_tmr_req
)
4166 core_tmr_release_req(cmd
->se_tmr_req
);
4167 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
4168 kfree(cmd
->t_task_cdb
);
4169 cmd
->se_tfo
->release_cmd(cmd
);
4171 EXPORT_SYMBOL(transport_release_cmd
);
4173 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
4175 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
4176 if (wait_for_tasks
&& cmd
->se_tmr_req
)
4177 transport_wait_for_tasks(cmd
);
4179 transport_release_cmd(cmd
);
4182 transport_wait_for_tasks(cmd
);
4184 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4187 transport_lun_remove_cmd(cmd
);
4189 transport_free_dev_tasks(cmd
);
4191 transport_put_cmd(cmd
);
4194 EXPORT_SYMBOL(transport_generic_free_cmd
);
4196 /* transport_lun_wait_for_tasks():
4198 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4199 * an struct se_lun to be successfully shutdown.
4201 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4203 unsigned long flags
;
4206 * If the frontend has already requested this struct se_cmd to
4207 * be stopped, we can safely ignore this struct se_cmd.
4209 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4210 if (atomic_read(&cmd
->t_transport_stop
)) {
4211 atomic_set(&cmd
->transport_lun_stop
, 0);
4212 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4213 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4214 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4215 transport_cmd_check_stop(cmd
, 1, 0);
4218 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4219 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4221 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4223 ret
= transport_stop_tasks_for_cmd(cmd
);
4225 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4226 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4228 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4229 cmd
->se_tfo
->get_task_tag(cmd
));
4230 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4231 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4232 cmd
->se_tfo
->get_task_tag(cmd
));
4234 transport_remove_cmd_from_queue(cmd
);
4239 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4241 struct se_cmd
*cmd
= NULL
;
4242 unsigned long lun_flags
, cmd_flags
;
4244 * Do exception processing and return CHECK_CONDITION status to the
4247 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4248 while (!list_empty(&lun
->lun_cmd_list
)) {
4249 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4250 struct se_cmd
, se_lun_node
);
4251 list_del(&cmd
->se_lun_node
);
4253 atomic_set(&cmd
->transport_lun_active
, 0);
4255 * This will notify iscsi_target_transport.c:
4256 * transport_cmd_check_stop() that a LUN shutdown is in
4257 * progress for the iscsi_cmd_t.
4259 spin_lock(&cmd
->t_state_lock
);
4260 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4261 "_lun_stop for ITT: 0x%08x\n",
4262 cmd
->se_lun
->unpacked_lun
,
4263 cmd
->se_tfo
->get_task_tag(cmd
));
4264 atomic_set(&cmd
->transport_lun_stop
, 1);
4265 spin_unlock(&cmd
->t_state_lock
);
4267 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4270 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4271 cmd
->se_tfo
->get_task_tag(cmd
),
4272 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4276 * If the Storage engine still owns the iscsi_cmd_t, determine
4277 * and/or stop its context.
4279 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4280 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4281 cmd
->se_tfo
->get_task_tag(cmd
));
4283 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4284 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4288 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4289 "_wait_for_tasks(): SUCCESS\n",
4290 cmd
->se_lun
->unpacked_lun
,
4291 cmd
->se_tfo
->get_task_tag(cmd
));
4293 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4294 if (!atomic_read(&cmd
->transport_dev_active
)) {
4295 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4298 atomic_set(&cmd
->transport_dev_active
, 0);
4299 transport_all_task_dev_remove_state(cmd
);
4300 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4302 transport_free_dev_tasks(cmd
);
4304 * The Storage engine stopped this struct se_cmd before it was
4305 * send to the fabric frontend for delivery back to the
4306 * Initiator Node. Return this SCSI CDB back with an
4307 * CHECK_CONDITION status.
4310 transport_send_check_condition_and_sense(cmd
,
4311 TCM_NON_EXISTENT_LUN
, 0);
4313 * If the fabric frontend is waiting for this iscsi_cmd_t to
4314 * be released, notify the waiting thread now that LU has
4315 * finished accessing it.
4317 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4318 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4319 pr_debug("SE_LUN[%d] - Detected FE stop for"
4320 " struct se_cmd: %p ITT: 0x%08x\n",
4322 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4324 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4326 transport_cmd_check_stop(cmd
, 1, 0);
4327 complete(&cmd
->transport_lun_fe_stop_comp
);
4328 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4331 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4332 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4334 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4335 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4337 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4340 static int transport_clear_lun_thread(void *p
)
4342 struct se_lun
*lun
= (struct se_lun
*)p
;
4344 __transport_clear_lun_from_sessions(lun
);
4345 complete(&lun
->lun_shutdown_comp
);
4350 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4352 struct task_struct
*kt
;
4354 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4355 "tcm_cl_%u", lun
->unpacked_lun
);
4357 pr_err("Unable to start clear_lun thread\n");
4360 wait_for_completion(&lun
->lun_shutdown_comp
);
4366 * transport_wait_for_tasks - wait for completion to occur
4367 * @cmd: command to wait
4369 * Called from frontend fabric context to wait for storage engine
4370 * to pause and/or release frontend generated struct se_cmd.
4372 void transport_wait_for_tasks(struct se_cmd
*cmd
)
4374 unsigned long flags
;
4376 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4377 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
)) {
4378 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4382 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4383 * has been set in transport_set_supported_SAM_opcode().
4385 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) && !cmd
->se_tmr_req
) {
4386 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4390 * If we are already stopped due to an external event (ie: LUN shutdown)
4391 * sleep until the connection can have the passed struct se_cmd back.
4392 * The cmd->transport_lun_stopped_sem will be upped by
4393 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4394 * has completed its operation on the struct se_cmd.
4396 if (atomic_read(&cmd
->transport_lun_stop
)) {
4398 pr_debug("wait_for_tasks: Stopping"
4399 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4400 "_stop_comp); for ITT: 0x%08x\n",
4401 cmd
->se_tfo
->get_task_tag(cmd
));
4403 * There is a special case for WRITES where a FE exception +
4404 * LUN shutdown means ConfigFS context is still sleeping on
4405 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4406 * We go ahead and up transport_lun_stop_comp just to be sure
4409 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4410 complete(&cmd
->transport_lun_stop_comp
);
4411 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4412 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4414 transport_all_task_dev_remove_state(cmd
);
4416 * At this point, the frontend who was the originator of this
4417 * struct se_cmd, now owns the structure and can be released through
4418 * normal means below.
4420 pr_debug("wait_for_tasks: Stopped"
4421 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4422 "stop_comp); for ITT: 0x%08x\n",
4423 cmd
->se_tfo
->get_task_tag(cmd
));
4425 atomic_set(&cmd
->transport_lun_stop
, 0);
4427 if (!atomic_read(&cmd
->t_transport_active
) ||
4428 atomic_read(&cmd
->t_transport_aborted
)) {
4429 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4433 atomic_set(&cmd
->t_transport_stop
, 1);
4435 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4436 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4437 " = TRUE\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4438 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
,
4439 cmd
->deferred_t_state
);
4441 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4443 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4445 wait_for_completion(&cmd
->t_transport_stop_comp
);
4447 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4448 atomic_set(&cmd
->t_transport_active
, 0);
4449 atomic_set(&cmd
->t_transport_stop
, 0);
4451 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4452 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4453 cmd
->se_tfo
->get_task_tag(cmd
));
4455 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4457 EXPORT_SYMBOL(transport_wait_for_tasks
);
4459 static int transport_get_sense_codes(
4464 *asc
= cmd
->scsi_asc
;
4465 *ascq
= cmd
->scsi_ascq
;
4470 static int transport_set_sense_codes(
4475 cmd
->scsi_asc
= asc
;
4476 cmd
->scsi_ascq
= ascq
;
4481 int transport_send_check_condition_and_sense(
4486 unsigned char *buffer
= cmd
->sense_buffer
;
4487 unsigned long flags
;
4489 u8 asc
= 0, ascq
= 0;
4491 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4492 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4493 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4496 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4497 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4499 if (!reason
&& from_transport
)
4502 if (!from_transport
)
4503 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4505 * Data Segment and SenseLength of the fabric response PDU.
4507 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4508 * from include/scsi/scsi_cmnd.h
4510 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4511 TRANSPORT_SENSE_BUFFER
);
4513 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4514 * SENSE KEY values from include/scsi/scsi.h
4517 case TCM_NON_EXISTENT_LUN
:
4519 buffer
[offset
] = 0x70;
4520 /* ILLEGAL REQUEST */
4521 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4522 /* LOGICAL UNIT NOT SUPPORTED */
4523 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4525 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4526 case TCM_SECTOR_COUNT_TOO_MANY
:
4528 buffer
[offset
] = 0x70;
4529 /* ILLEGAL REQUEST */
4530 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4531 /* INVALID COMMAND OPERATION CODE */
4532 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4534 case TCM_UNKNOWN_MODE_PAGE
:
4536 buffer
[offset
] = 0x70;
4537 /* ILLEGAL REQUEST */
4538 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4539 /* INVALID FIELD IN CDB */
4540 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4542 case TCM_CHECK_CONDITION_ABORT_CMD
:
4544 buffer
[offset
] = 0x70;
4545 /* ABORTED COMMAND */
4546 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4547 /* BUS DEVICE RESET FUNCTION OCCURRED */
4548 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4549 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4551 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4553 buffer
[offset
] = 0x70;
4554 /* ABORTED COMMAND */
4555 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4557 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4558 /* NOT ENOUGH UNSOLICITED DATA */
4559 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4561 case TCM_INVALID_CDB_FIELD
:
4563 buffer
[offset
] = 0x70;
4564 /* ABORTED COMMAND */
4565 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4566 /* INVALID FIELD IN CDB */
4567 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4569 case TCM_INVALID_PARAMETER_LIST
:
4571 buffer
[offset
] = 0x70;
4572 /* ABORTED COMMAND */
4573 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4574 /* INVALID FIELD IN PARAMETER LIST */
4575 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4577 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4579 buffer
[offset
] = 0x70;
4580 /* ABORTED COMMAND */
4581 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4583 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4584 /* UNEXPECTED_UNSOLICITED_DATA */
4585 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4587 case TCM_SERVICE_CRC_ERROR
:
4589 buffer
[offset
] = 0x70;
4590 /* ABORTED COMMAND */
4591 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4592 /* PROTOCOL SERVICE CRC ERROR */
4593 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4595 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4597 case TCM_SNACK_REJECTED
:
4599 buffer
[offset
] = 0x70;
4600 /* ABORTED COMMAND */
4601 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4603 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4604 /* FAILED RETRANSMISSION REQUEST */
4605 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4607 case TCM_WRITE_PROTECTED
:
4609 buffer
[offset
] = 0x70;
4611 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4612 /* WRITE PROTECTED */
4613 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4615 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4617 buffer
[offset
] = 0x70;
4618 /* UNIT ATTENTION */
4619 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4620 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4621 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4622 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4624 case TCM_CHECK_CONDITION_NOT_READY
:
4626 buffer
[offset
] = 0x70;
4628 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4629 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4630 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4631 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4633 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4636 buffer
[offset
] = 0x70;
4637 /* ILLEGAL REQUEST */
4638 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4639 /* LOGICAL UNIT COMMUNICATION FAILURE */
4640 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4644 * This code uses linux/include/scsi/scsi.h SAM status codes!
4646 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4648 * Automatically padded, this value is encoded in the fabric's
4649 * data_length response PDU containing the SCSI defined sense data.
4651 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4654 return cmd
->se_tfo
->queue_status(cmd
);
4656 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4658 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4662 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4664 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4667 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4668 " status for CDB: 0x%02x ITT: 0x%08x\n",
4670 cmd
->se_tfo
->get_task_tag(cmd
));
4672 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4673 cmd
->se_tfo
->queue_status(cmd
);
4678 EXPORT_SYMBOL(transport_check_aborted_status
);
4680 void transport_send_task_abort(struct se_cmd
*cmd
)
4682 unsigned long flags
;
4684 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4685 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4686 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4689 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4692 * If there are still expected incoming fabric WRITEs, we wait
4693 * until until they have completed before sending a TASK_ABORTED
4694 * response. This response with TASK_ABORTED status will be
4695 * queued back to fabric module by transport_check_aborted_status().
4697 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4698 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4699 atomic_inc(&cmd
->t_transport_aborted
);
4700 smp_mb__after_atomic_inc();
4701 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4702 transport_new_cmd_failure(cmd
);
4706 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4708 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4709 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4710 cmd
->se_tfo
->get_task_tag(cmd
));
4712 cmd
->se_tfo
->queue_status(cmd
);
4715 /* transport_generic_do_tmr():
4719 int transport_generic_do_tmr(struct se_cmd
*cmd
)
4721 struct se_device
*dev
= cmd
->se_dev
;
4722 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4725 switch (tmr
->function
) {
4726 case TMR_ABORT_TASK
:
4727 tmr
->response
= TMR_FUNCTION_REJECTED
;
4729 case TMR_ABORT_TASK_SET
:
4731 case TMR_CLEAR_TASK_SET
:
4732 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4735 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4736 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4737 TMR_FUNCTION_REJECTED
;
4739 case TMR_TARGET_WARM_RESET
:
4740 tmr
->response
= TMR_FUNCTION_REJECTED
;
4742 case TMR_TARGET_COLD_RESET
:
4743 tmr
->response
= TMR_FUNCTION_REJECTED
;
4746 pr_err("Uknown TMR function: 0x%02x.\n",
4748 tmr
->response
= TMR_FUNCTION_REJECTED
;
4752 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4753 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4755 transport_cmd_check_stop(cmd
, 2, 0);
4759 /* transport_processing_thread():
4763 static int transport_processing_thread(void *param
)
4767 struct se_device
*dev
= (struct se_device
*) param
;
4769 set_user_nice(current
, -20);
4771 while (!kthread_should_stop()) {
4772 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4773 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4774 kthread_should_stop());
4779 __transport_execute_tasks(dev
);
4781 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4785 switch (cmd
->t_state
) {
4786 case TRANSPORT_NEW_CMD
:
4789 case TRANSPORT_NEW_CMD_MAP
:
4790 if (!cmd
->se_tfo
->new_cmd_map
) {
4791 pr_err("cmd->se_tfo->new_cmd_map is"
4792 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4795 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4797 cmd
->transport_error_status
= ret
;
4798 transport_generic_request_failure(cmd
, NULL
,
4799 0, (cmd
->data_direction
!=
4803 ret
= transport_generic_new_cmd(cmd
);
4807 cmd
->transport_error_status
= ret
;
4808 transport_generic_request_failure(cmd
, NULL
,
4809 0, (cmd
->data_direction
!=
4813 case TRANSPORT_PROCESS_WRITE
:
4814 transport_generic_process_write(cmd
);
4816 case TRANSPORT_COMPLETE_OK
:
4817 transport_stop_all_task_timers(cmd
);
4818 transport_generic_complete_ok(cmd
);
4820 case TRANSPORT_REMOVE
:
4821 transport_put_cmd(cmd
);
4823 case TRANSPORT_FREE_CMD_INTR
:
4824 transport_generic_free_cmd(cmd
, 0);
4826 case TRANSPORT_PROCESS_TMR
:
4827 transport_generic_do_tmr(cmd
);
4829 case TRANSPORT_COMPLETE_FAILURE
:
4830 transport_generic_request_failure(cmd
, NULL
, 1, 1);
4832 case TRANSPORT_COMPLETE_TIMEOUT
:
4833 transport_stop_all_task_timers(cmd
);
4834 transport_generic_request_timeout(cmd
);
4836 case TRANSPORT_COMPLETE_QF_WP
:
4837 transport_write_pending_qf(cmd
);
4839 case TRANSPORT_COMPLETE_QF_OK
:
4840 transport_complete_qf(cmd
);
4843 pr_err("Unknown t_state: %d deferred_t_state:"
4844 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
4845 " %u\n", cmd
->t_state
, cmd
->deferred_t_state
,
4846 cmd
->se_tfo
->get_task_tag(cmd
),
4847 cmd
->se_tfo
->get_cmd_state(cmd
),
4848 cmd
->se_lun
->unpacked_lun
);
4856 WARN_ON(!list_empty(&dev
->state_task_list
));
4857 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4858 dev
->process_thread
= NULL
;