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
);
1766 * If the task is active, request it to be stopped and sleep until it
1769 bool target_stop_task(struct se_task
*task
, unsigned long *flags
)
1771 struct se_cmd
*cmd
= task
->task_se_cmd
;
1772 bool was_active
= false;
1774 if (task
->task_flags
& TF_ACTIVE
) {
1775 task
->task_flags
|= TF_REQUEST_STOP
;
1776 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1778 pr_debug("Task %p waiting to complete\n", task
);
1779 wait_for_completion(&task
->task_stop_comp
);
1780 pr_debug("Task %p stopped successfully\n", task
);
1782 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1783 atomic_dec(&cmd
->t_task_cdbs_left
);
1784 task
->task_flags
&= ~(TF_ACTIVE
| TF_REQUEST_STOP
);
1788 __transport_stop_task_timer(task
, flags
);
1792 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1794 struct se_task
*task
, *task_tmp
;
1795 unsigned long flags
;
1798 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1799 cmd
->se_tfo
->get_task_tag(cmd
));
1802 * No tasks remain in the execution queue
1804 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1805 list_for_each_entry_safe(task
, task_tmp
,
1806 &cmd
->t_task_list
, t_list
) {
1807 pr_debug("Processing task %p\n", task
);
1809 * If the struct se_task has not been sent and is not active,
1810 * remove the struct se_task from the execution queue.
1812 if (!(task
->task_flags
& (TF_ACTIVE
| TF_SENT
))) {
1813 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1815 transport_remove_task_from_execute_queue(task
,
1818 pr_debug("Task %p removed from execute queue\n", task
);
1819 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1823 if (!target_stop_task(task
, &flags
)) {
1824 pr_debug("Task %p - did nothing\n", task
);
1828 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1834 * Handle SAM-esque emulation for generic transport request failures.
1836 static void transport_generic_request_failure(
1838 struct se_device
*dev
,
1844 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1845 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1846 cmd
->t_task_cdb
[0]);
1847 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1848 " %d/%d transport_error_status: %d\n",
1849 cmd
->se_tfo
->get_cmd_state(cmd
),
1850 cmd
->t_state
, cmd
->deferred_t_state
,
1851 cmd
->transport_error_status
);
1852 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1853 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1854 " t_transport_active: %d t_transport_stop: %d"
1855 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1856 atomic_read(&cmd
->t_task_cdbs_left
),
1857 atomic_read(&cmd
->t_task_cdbs_sent
),
1858 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1859 atomic_read(&cmd
->t_transport_active
),
1860 atomic_read(&cmd
->t_transport_stop
),
1861 atomic_read(&cmd
->t_transport_sent
));
1863 transport_stop_all_task_timers(cmd
);
1866 atomic_inc(&dev
->depth_left
);
1868 * For SAM Task Attribute emulation for failed struct se_cmd
1870 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1871 transport_complete_task_attr(cmd
);
1874 transport_direct_request_timeout(cmd
);
1875 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
1878 switch (cmd
->transport_error_status
) {
1879 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
1880 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1882 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
1883 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
1885 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
1886 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1888 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
1889 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
1891 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
1893 transport_new_cmd_failure(cmd
);
1895 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1896 * we force this session to fall back to session
1899 cmd
->se_tfo
->fall_back_to_erl0(cmd
->se_sess
);
1900 cmd
->se_tfo
->stop_session(cmd
->se_sess
, 0, 0);
1903 case PYX_TRANSPORT_LU_COMM_FAILURE
:
1904 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
1905 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1907 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
1908 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
1910 case PYX_TRANSPORT_WRITE_PROTECTED
:
1911 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
1913 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
1915 * No SENSE Data payload for this case, set SCSI Status
1916 * and queue the response to $FABRIC_MOD.
1918 * Uses linux/include/scsi/scsi.h SAM status codes defs
1920 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1922 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1923 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1926 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1929 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1930 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1931 cmd
->orig_fe_lun
, 0x2C,
1932 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1934 ret
= cmd
->se_tfo
->queue_status(cmd
);
1938 case PYX_TRANSPORT_USE_SENSE_REASON
:
1940 * struct se_cmd->scsi_sense_reason already set
1944 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1946 cmd
->transport_error_status
);
1947 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1951 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1952 * make the call to transport_send_check_condition_and_sense()
1953 * directly. Otherwise expect the fabric to make the call to
1954 * transport_send_check_condition_and_sense() after handling
1955 * possible unsoliticied write data payloads.
1957 if (!sc
&& !cmd
->se_tfo
->new_cmd_map
)
1958 transport_new_cmd_failure(cmd
);
1960 ret
= transport_send_check_condition_and_sense(cmd
,
1961 cmd
->scsi_sense_reason
, 0);
1967 transport_lun_remove_cmd(cmd
);
1968 if (!transport_cmd_check_stop_to_fabric(cmd
))
1973 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1974 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1977 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
1979 unsigned long flags
;
1981 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1982 if (!atomic_read(&cmd
->t_transport_timeout
)) {
1983 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1986 if (atomic_read(&cmd
->t_task_cdbs_timeout_left
)) {
1987 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1991 atomic_sub(atomic_read(&cmd
->t_transport_timeout
),
1993 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1996 static void transport_generic_request_timeout(struct se_cmd
*cmd
)
1998 unsigned long flags
;
2001 * Reset cmd->t_se_count to allow transport_put_cmd()
2002 * to allow last call to free memory resources.
2004 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2005 if (atomic_read(&cmd
->t_transport_timeout
) > 1) {
2006 int tmp
= (atomic_read(&cmd
->t_transport_timeout
) - 1);
2008 atomic_sub(tmp
, &cmd
->t_se_count
);
2010 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2012 transport_put_cmd(cmd
);
2015 static inline u32
transport_lba_21(unsigned char *cdb
)
2017 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2020 static inline u32
transport_lba_32(unsigned char *cdb
)
2022 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2025 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2027 unsigned int __v1
, __v2
;
2029 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2030 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2032 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2036 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2038 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2040 unsigned int __v1
, __v2
;
2042 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2043 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2045 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2048 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2050 unsigned long flags
;
2052 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2053 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2054 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2058 * Called from interrupt context.
2060 static void transport_task_timeout_handler(unsigned long data
)
2062 struct se_task
*task
= (struct se_task
*)data
;
2063 struct se_cmd
*cmd
= task
->task_se_cmd
;
2064 unsigned long flags
;
2066 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2068 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2069 if (task
->task_flags
& TF_TIMER_STOP
) {
2070 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2073 task
->task_flags
&= ~TF_TIMER_RUNNING
;
2076 * Determine if transport_complete_task() has already been called.
2078 if (!(task
->task_flags
& TF_ACTIVE
)) {
2079 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2081 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2085 atomic_inc(&cmd
->t_se_count
);
2086 atomic_inc(&cmd
->t_transport_timeout
);
2087 cmd
->t_tasks_failed
= 1;
2089 task
->task_flags
|= TF_TIMEOUT
;
2090 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2091 task
->task_scsi_status
= 1;
2093 if (task
->task_flags
& TF_REQUEST_STOP
) {
2094 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2095 " == 1\n", task
, cmd
);
2096 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2097 complete(&task
->task_stop_comp
);
2101 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
2102 pr_debug("transport task: %p cmd: %p timeout non zero"
2103 " t_task_cdbs_left\n", task
, cmd
);
2104 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2107 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2110 cmd
->t_state
= TRANSPORT_COMPLETE_FAILURE
;
2111 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2113 transport_add_cmd_to_queue(cmd
, TRANSPORT_COMPLETE_FAILURE
, false);
2117 * Called with cmd->t_state_lock held.
2119 static void transport_start_task_timer(struct se_task
*task
)
2121 struct se_device
*dev
= task
->task_se_cmd
->se_dev
;
2124 if (task
->task_flags
& TF_TIMER_RUNNING
)
2127 * If the task_timeout is disabled, exit now.
2129 timeout
= dev
->se_sub_dev
->se_dev_attrib
.task_timeout
;
2133 init_timer(&task
->task_timer
);
2134 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2135 task
->task_timer
.data
= (unsigned long) task
;
2136 task
->task_timer
.function
= transport_task_timeout_handler
;
2138 task
->task_flags
|= TF_TIMER_RUNNING
;
2139 add_timer(&task
->task_timer
);
2141 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2142 " %d\n", task
->task_se_cmd
, task
, timeout
);
2147 * Called with spin_lock_irq(&cmd->t_state_lock) held.
2149 void __transport_stop_task_timer(struct se_task
*task
, unsigned long *flags
)
2151 struct se_cmd
*cmd
= task
->task_se_cmd
;
2153 if (!(task
->task_flags
& TF_TIMER_RUNNING
))
2156 task
->task_flags
|= TF_TIMER_STOP
;
2157 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
2159 del_timer_sync(&task
->task_timer
);
2161 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
2162 task
->task_flags
&= ~TF_TIMER_RUNNING
;
2163 task
->task_flags
&= ~TF_TIMER_STOP
;
2166 static void transport_stop_all_task_timers(struct se_cmd
*cmd
)
2168 struct se_task
*task
= NULL
, *task_tmp
;
2169 unsigned long flags
;
2171 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2172 list_for_each_entry_safe(task
, task_tmp
,
2173 &cmd
->t_task_list
, t_list
)
2174 __transport_stop_task_timer(task
, &flags
);
2175 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2178 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2180 if (dev
->dev_tcq_window_closed
++ <
2181 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2182 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2184 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2186 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
2191 * Called from Fabric Module context from transport_execute_tasks()
2193 * The return of this function determins if the tasks from struct se_cmd
2194 * get added to the execution queue in transport_execute_tasks(),
2195 * or are added to the delayed or ordered lists here.
2197 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2199 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2202 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2203 * to allow the passed struct se_cmd list of tasks to the front of the list.
2205 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2206 atomic_inc(&cmd
->se_dev
->dev_hoq_count
);
2207 smp_mb__after_atomic_inc();
2208 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2209 " 0x%02x, se_ordered_id: %u\n",
2211 cmd
->se_ordered_id
);
2213 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2214 spin_lock(&cmd
->se_dev
->ordered_cmd_lock
);
2215 list_add_tail(&cmd
->se_ordered_node
,
2216 &cmd
->se_dev
->ordered_cmd_list
);
2217 spin_unlock(&cmd
->se_dev
->ordered_cmd_lock
);
2219 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2220 smp_mb__after_atomic_inc();
2222 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2223 " list, se_ordered_id: %u\n",
2225 cmd
->se_ordered_id
);
2227 * Add ORDERED command to tail of execution queue if
2228 * no other older commands exist that need to be
2231 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2235 * For SIMPLE and UNTAGGED Task Attribute commands
2237 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2238 smp_mb__after_atomic_inc();
2241 * Otherwise if one or more outstanding ORDERED task attribute exist,
2242 * add the dormant task(s) built for the passed struct se_cmd to the
2243 * execution queue and become in Active state for this struct se_device.
2245 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2247 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2248 * will be drained upon completion of HEAD_OF_QUEUE task.
2250 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2251 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2252 list_add_tail(&cmd
->se_delayed_node
,
2253 &cmd
->se_dev
->delayed_cmd_list
);
2254 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2256 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2257 " delayed CMD list, se_ordered_id: %u\n",
2258 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2259 cmd
->se_ordered_id
);
2261 * Return zero to let transport_execute_tasks() know
2262 * not to add the delayed tasks to the execution list.
2267 * Otherwise, no ORDERED task attributes exist..
2273 * Called from fabric module context in transport_generic_new_cmd() and
2274 * transport_generic_process_write()
2276 static int transport_execute_tasks(struct se_cmd
*cmd
)
2280 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2281 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2282 transport_generic_request_failure(cmd
, NULL
, 0, 1);
2287 * Call transport_cmd_check_stop() to see if a fabric exception
2288 * has occurred that prevents execution.
2290 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2292 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2293 * attribute for the tasks of the received struct se_cmd CDB
2295 add_tasks
= transport_execute_task_attr(cmd
);
2299 * This calls transport_add_tasks_from_cmd() to handle
2300 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2301 * (if enabled) in __transport_add_task_to_execute_queue() and
2302 * transport_add_task_check_sam_attr().
2304 transport_add_tasks_from_cmd(cmd
);
2307 * Kick the execution queue for the cmd associated struct se_device
2311 __transport_execute_tasks(cmd
->se_dev
);
2316 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2317 * from struct se_device->execute_task_list and
2319 * Called from transport_processing_thread()
2321 static int __transport_execute_tasks(struct se_device
*dev
)
2324 struct se_cmd
*cmd
= NULL
;
2325 struct se_task
*task
= NULL
;
2326 unsigned long flags
;
2329 * Check if there is enough room in the device and HBA queue to send
2330 * struct se_tasks to the selected transport.
2333 if (!atomic_read(&dev
->depth_left
))
2334 return transport_tcq_window_closed(dev
);
2336 dev
->dev_tcq_window_closed
= 0;
2338 spin_lock_irq(&dev
->execute_task_lock
);
2339 if (list_empty(&dev
->execute_task_list
)) {
2340 spin_unlock_irq(&dev
->execute_task_lock
);
2343 task
= list_first_entry(&dev
->execute_task_list
,
2344 struct se_task
, t_execute_list
);
2345 __transport_remove_task_from_execute_queue(task
, dev
);
2346 spin_unlock_irq(&dev
->execute_task_lock
);
2348 atomic_dec(&dev
->depth_left
);
2350 cmd
= task
->task_se_cmd
;
2352 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2353 task
->task_flags
|= (TF_ACTIVE
| TF_SENT
);
2354 atomic_inc(&cmd
->t_task_cdbs_sent
);
2356 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2357 cmd
->t_task_list_num
)
2358 atomic_set(&cmd
->transport_sent
, 1);
2360 transport_start_task_timer(task
);
2361 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2363 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2364 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2365 * struct se_subsystem_api->do_task() caller below.
2367 if (cmd
->transport_emulate_cdb
) {
2368 error
= cmd
->transport_emulate_cdb(cmd
);
2370 cmd
->transport_error_status
= error
;
2371 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2372 task
->task_flags
&= ~TF_ACTIVE
;
2373 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2374 atomic_set(&cmd
->transport_sent
, 0);
2375 transport_stop_tasks_for_cmd(cmd
);
2376 transport_generic_request_failure(cmd
, dev
, 0, 1);
2380 * Handle the successful completion for transport_emulate_cdb()
2381 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2382 * Otherwise the caller is expected to complete the task with
2385 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2386 cmd
->scsi_status
= SAM_STAT_GOOD
;
2387 task
->task_scsi_status
= GOOD
;
2388 transport_complete_task(task
, 1);
2392 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2393 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2394 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2395 * LUN emulation code.
2397 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2398 * call ->do_task() directly and let the underlying TCM subsystem plugin
2399 * code handle the CDB emulation.
2401 if ((dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2402 (!(task
->task_se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2403 error
= transport_emulate_control_cdb(task
);
2405 error
= dev
->transport
->do_task(task
);
2408 cmd
->transport_error_status
= error
;
2409 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2410 task
->task_flags
&= ~TF_ACTIVE
;
2411 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2412 atomic_set(&cmd
->transport_sent
, 0);
2413 transport_stop_tasks_for_cmd(cmd
);
2414 transport_generic_request_failure(cmd
, dev
, 0, 1);
2423 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2425 unsigned long flags
;
2427 * Any unsolicited data will get dumped for failed command inside of
2430 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2431 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2432 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2433 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2436 static inline u32
transport_get_sectors_6(
2441 struct se_device
*dev
= cmd
->se_dev
;
2444 * Assume TYPE_DISK for non struct se_device objects.
2445 * Use 8-bit sector value.
2451 * Use 24-bit allocation length for TYPE_TAPE.
2453 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2454 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2457 * Everything else assume TYPE_DISK Sector CDB location.
2458 * Use 8-bit sector value.
2464 static inline u32
transport_get_sectors_10(
2469 struct se_device
*dev
= cmd
->se_dev
;
2472 * Assume TYPE_DISK for non struct se_device objects.
2473 * Use 16-bit sector value.
2479 * XXX_10 is not defined in SSC, throw an exception
2481 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2487 * Everything else assume TYPE_DISK Sector CDB location.
2488 * Use 16-bit sector value.
2491 return (u32
)(cdb
[7] << 8) + cdb
[8];
2494 static inline u32
transport_get_sectors_12(
2499 struct se_device
*dev
= cmd
->se_dev
;
2502 * Assume TYPE_DISK for non struct se_device objects.
2503 * Use 32-bit sector value.
2509 * XXX_12 is not defined in SSC, throw an exception
2511 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2517 * Everything else assume TYPE_DISK Sector CDB location.
2518 * Use 32-bit sector value.
2521 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2524 static inline u32
transport_get_sectors_16(
2529 struct se_device
*dev
= cmd
->se_dev
;
2532 * Assume TYPE_DISK for non struct se_device objects.
2533 * Use 32-bit sector value.
2539 * Use 24-bit allocation length for TYPE_TAPE.
2541 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2542 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2545 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2546 (cdb
[12] << 8) + cdb
[13];
2550 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2552 static inline u32
transport_get_sectors_32(
2558 * Assume TYPE_DISK for non struct se_device objects.
2559 * Use 32-bit sector value.
2561 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2562 (cdb
[30] << 8) + cdb
[31];
2566 static inline u32
transport_get_size(
2571 struct se_device
*dev
= cmd
->se_dev
;
2573 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2574 if (cdb
[1] & 1) { /* sectors */
2575 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2580 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2581 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2582 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2583 dev
->transport
->name
);
2585 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2588 static void transport_xor_callback(struct se_cmd
*cmd
)
2590 unsigned char *buf
, *addr
;
2591 struct scatterlist
*sg
;
2592 unsigned int offset
;
2596 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2598 * 1) read the specified logical block(s);
2599 * 2) transfer logical blocks from the data-out buffer;
2600 * 3) XOR the logical blocks transferred from the data-out buffer with
2601 * the logical blocks read, storing the resulting XOR data in a buffer;
2602 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2603 * blocks transferred from the data-out buffer; and
2604 * 5) transfer the resulting XOR data to the data-in buffer.
2606 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2608 pr_err("Unable to allocate xor_callback buf\n");
2612 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2613 * into the locally allocated *buf
2615 sg_copy_to_buffer(cmd
->t_data_sg
,
2621 * Now perform the XOR against the BIDI read memory located at
2622 * cmd->t_mem_bidi_list
2626 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2627 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2631 for (i
= 0; i
< sg
->length
; i
++)
2632 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2634 offset
+= sg
->length
;
2635 kunmap_atomic(addr
, KM_USER0
);
2643 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2645 static int transport_get_sense_data(struct se_cmd
*cmd
)
2647 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2648 struct se_device
*dev
= cmd
->se_dev
;
2649 struct se_task
*task
= NULL
, *task_tmp
;
2650 unsigned long flags
;
2653 WARN_ON(!cmd
->se_lun
);
2658 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2659 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2660 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2664 list_for_each_entry_safe(task
, task_tmp
,
2665 &cmd
->t_task_list
, t_list
) {
2666 if (!task
->task_sense
)
2669 if (!dev
->transport
->get_sense_buffer
) {
2670 pr_err("dev->transport->get_sense_buffer"
2675 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2676 if (!sense_buffer
) {
2677 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2678 " sense buffer for task with sense\n",
2679 cmd
->se_tfo
->get_task_tag(cmd
), task
);
2682 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2684 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2685 TRANSPORT_SENSE_BUFFER
);
2687 memcpy(&buffer
[offset
], sense_buffer
,
2688 TRANSPORT_SENSE_BUFFER
);
2689 cmd
->scsi_status
= task
->task_scsi_status
;
2690 /* Automatically padded */
2691 cmd
->scsi_sense_length
=
2692 (TRANSPORT_SENSE_BUFFER
+ offset
);
2694 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2696 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2700 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2706 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
2708 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2709 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2710 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2712 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2713 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2716 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2719 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2720 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2721 cmd
->orig_fe_lun
, 0x2C,
2722 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2726 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2728 return dev
->transport
->get_blocks(dev
) + 1;
2731 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2733 struct se_device
*dev
= cmd
->se_dev
;
2736 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2739 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2741 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2742 pr_err("LBA: %llu Sectors: %u exceeds"
2743 " transport_dev_end_lba(): %llu\n",
2744 cmd
->t_task_lba
, sectors
,
2745 transport_dev_end_lba(dev
));
2752 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2755 * Determine if the received WRITE_SAME is used to for direct
2756 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2757 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2758 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2760 int passthrough
= (dev
->transport
->transport_type
==
2761 TRANSPORT_PLUGIN_PHBA_PDEV
);
2764 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2765 pr_err("WRITE_SAME PBDATA and LBDATA"
2766 " bits not supported for Block Discard"
2771 * Currently for the emulated case we only accept
2772 * tpws with the UNMAP=1 bit set.
2774 if (!(flags
[0] & 0x08)) {
2775 pr_err("WRITE_SAME w/o UNMAP bit not"
2776 " supported for Block Discard Emulation\n");
2784 /* transport_generic_cmd_sequencer():
2786 * Generic Command Sequencer that should work for most DAS transport
2789 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2792 * FIXME: Need to support other SCSI OPCODES where as well.
2794 static int transport_generic_cmd_sequencer(
2798 struct se_device
*dev
= cmd
->se_dev
;
2799 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2800 int ret
= 0, sector_ret
= 0, passthrough
;
2801 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2805 * Check for an existing UNIT ATTENTION condition
2807 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2808 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2809 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2813 * Check status of Asymmetric Logical Unit Assignment port
2815 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2818 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2819 * The ALUA additional sense code qualifier (ASCQ) is determined
2820 * by the ALUA primary or secondary access state..
2824 pr_debug("[%s]: ALUA TG Port not available,"
2825 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2826 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2828 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2829 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2830 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2833 goto out_invalid_cdb_field
;
2836 * Check status for SPC-3 Persistent Reservations
2838 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2839 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2840 cmd
, cdb
, pr_reg_type
) != 0)
2841 return transport_handle_reservation_conflict(cmd
);
2843 * This means the CDB is allowed for the SCSI Initiator port
2844 * when said port is *NOT* holding the legacy SPC-2 or
2845 * SPC-3 Persistent Reservation.
2851 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2853 goto out_unsupported_cdb
;
2854 size
= transport_get_size(sectors
, cdb
, cmd
);
2855 cmd
->t_task_lba
= transport_lba_21(cdb
);
2856 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2859 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2861 goto out_unsupported_cdb
;
2862 size
= transport_get_size(sectors
, cdb
, cmd
);
2863 cmd
->t_task_lba
= transport_lba_32(cdb
);
2864 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2867 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2869 goto out_unsupported_cdb
;
2870 size
= transport_get_size(sectors
, cdb
, cmd
);
2871 cmd
->t_task_lba
= transport_lba_32(cdb
);
2872 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2875 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2877 goto out_unsupported_cdb
;
2878 size
= transport_get_size(sectors
, cdb
, cmd
);
2879 cmd
->t_task_lba
= transport_lba_64(cdb
);
2880 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2883 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2885 goto out_unsupported_cdb
;
2886 size
= transport_get_size(sectors
, cdb
, cmd
);
2887 cmd
->t_task_lba
= transport_lba_21(cdb
);
2888 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2891 sectors
= transport_get_sectors_10(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_12(cdb
, cmd
, §or_ret
);
2902 goto out_unsupported_cdb
;
2903 size
= transport_get_size(sectors
, cdb
, cmd
);
2904 cmd
->t_task_lba
= transport_lba_32(cdb
);
2905 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2906 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2909 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2911 goto out_unsupported_cdb
;
2912 size
= transport_get_size(sectors
, cdb
, cmd
);
2913 cmd
->t_task_lba
= transport_lba_64(cdb
);
2914 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2915 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2917 case XDWRITEREAD_10
:
2918 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2919 !(cmd
->t_tasks_bidi
))
2920 goto out_invalid_cdb_field
;
2921 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2923 goto out_unsupported_cdb
;
2924 size
= transport_get_size(sectors
, cdb
, cmd
);
2925 cmd
->t_task_lba
= transport_lba_32(cdb
);
2926 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2927 passthrough
= (dev
->transport
->transport_type
==
2928 TRANSPORT_PLUGIN_PHBA_PDEV
);
2930 * Skip the remaining assignments for TCM/PSCSI passthrough
2935 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2937 cmd
->transport_complete_callback
= &transport_xor_callback
;
2938 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2940 case VARIABLE_LENGTH_CMD
:
2941 service_action
= get_unaligned_be16(&cdb
[8]);
2943 * Determine if this is TCM/PSCSI device and we should disable
2944 * internal emulation for this CDB.
2946 passthrough
= (dev
->transport
->transport_type
==
2947 TRANSPORT_PLUGIN_PHBA_PDEV
);
2949 switch (service_action
) {
2950 case XDWRITEREAD_32
:
2951 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2953 goto out_unsupported_cdb
;
2954 size
= transport_get_size(sectors
, cdb
, cmd
);
2956 * Use WRITE_32 and READ_32 opcodes for the emulated
2957 * XDWRITE_READ_32 logic.
2959 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2960 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2963 * Skip the remaining assignments for TCM/PSCSI passthrough
2969 * Setup BIDI XOR callback to be run during
2970 * transport_generic_complete_ok()
2972 cmd
->transport_complete_callback
= &transport_xor_callback
;
2973 cmd
->t_tasks_fua
= (cdb
[10] & 0x8);
2976 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2978 goto out_unsupported_cdb
;
2981 size
= transport_get_size(1, cdb
, cmd
);
2983 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2985 goto out_invalid_cdb_field
;
2988 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2989 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2991 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2992 goto out_invalid_cdb_field
;
2996 pr_err("VARIABLE_LENGTH_CMD service action"
2997 " 0x%04x not supported\n", service_action
);
2998 goto out_unsupported_cdb
;
3001 case MAINTENANCE_IN
:
3002 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3003 /* MAINTENANCE_IN from SCC-2 */
3005 * Check for emulated MI_REPORT_TARGET_PGS.
3007 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
3008 cmd
->transport_emulate_cdb
=
3009 (su_dev
->t10_alua
.alua_type
==
3010 SPC3_ALUA_EMULATED
) ?
3011 core_emulate_report_target_port_groups
:
3014 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3015 (cdb
[8] << 8) | cdb
[9];
3017 /* GPCMD_SEND_KEY from multi media commands */
3018 size
= (cdb
[8] << 8) + cdb
[9];
3020 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3024 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3026 case MODE_SELECT_10
:
3027 size
= (cdb
[7] << 8) + cdb
[8];
3028 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3032 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3035 case GPCMD_READ_BUFFER_CAPACITY
:
3036 case GPCMD_SEND_OPC
:
3039 size
= (cdb
[7] << 8) + cdb
[8];
3040 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3042 case READ_BLOCK_LIMITS
:
3043 size
= READ_BLOCK_LEN
;
3044 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3046 case GPCMD_GET_CONFIGURATION
:
3047 case GPCMD_READ_FORMAT_CAPACITIES
:
3048 case GPCMD_READ_DISC_INFO
:
3049 case GPCMD_READ_TRACK_RZONE_INFO
:
3050 size
= (cdb
[7] << 8) + cdb
[8];
3051 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3053 case PERSISTENT_RESERVE_IN
:
3054 case PERSISTENT_RESERVE_OUT
:
3055 cmd
->transport_emulate_cdb
=
3056 (su_dev
->t10_pr
.res_type
==
3057 SPC3_PERSISTENT_RESERVATIONS
) ?
3058 core_scsi3_emulate_pr
: NULL
;
3059 size
= (cdb
[7] << 8) + cdb
[8];
3060 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3062 case GPCMD_MECHANISM_STATUS
:
3063 case GPCMD_READ_DVD_STRUCTURE
:
3064 size
= (cdb
[8] << 8) + cdb
[9];
3065 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3068 size
= READ_POSITION_LEN
;
3069 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3071 case MAINTENANCE_OUT
:
3072 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3073 /* MAINTENANCE_OUT from SCC-2
3075 * Check for emulated MO_SET_TARGET_PGS.
3077 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3078 cmd
->transport_emulate_cdb
=
3079 (su_dev
->t10_alua
.alua_type
==
3080 SPC3_ALUA_EMULATED
) ?
3081 core_emulate_set_target_port_groups
:
3085 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3086 (cdb
[8] << 8) | cdb
[9];
3088 /* GPCMD_REPORT_KEY from multi media commands */
3089 size
= (cdb
[8] << 8) + cdb
[9];
3091 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3094 size
= (cdb
[3] << 8) + cdb
[4];
3096 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3097 * See spc4r17 section 5.3
3099 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3100 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3101 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3104 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3105 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3108 size
= READ_CAP_LEN
;
3109 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3111 case READ_MEDIA_SERIAL_NUMBER
:
3112 case SECURITY_PROTOCOL_IN
:
3113 case SECURITY_PROTOCOL_OUT
:
3114 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3115 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3117 case SERVICE_ACTION_IN
:
3118 case ACCESS_CONTROL_IN
:
3119 case ACCESS_CONTROL_OUT
:
3121 case READ_ATTRIBUTE
:
3122 case RECEIVE_COPY_RESULTS
:
3123 case WRITE_ATTRIBUTE
:
3124 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3125 (cdb
[12] << 8) | cdb
[13];
3126 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3128 case RECEIVE_DIAGNOSTIC
:
3129 case SEND_DIAGNOSTIC
:
3130 size
= (cdb
[3] << 8) | cdb
[4];
3131 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3133 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3136 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3137 size
= (2336 * sectors
);
3138 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3143 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3147 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3149 case READ_ELEMENT_STATUS
:
3150 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3151 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3154 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3155 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3160 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3161 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3163 if (cdb
[0] == RESERVE_10
)
3164 size
= (cdb
[7] << 8) | cdb
[8];
3166 size
= cmd
->data_length
;
3169 * Setup the legacy emulated handler for SPC-2 and
3170 * >= SPC-3 compatible reservation handling (CRH=1)
3171 * Otherwise, we assume the underlying SCSI logic is
3172 * is running in SPC_PASSTHROUGH, and wants reservations
3173 * emulation disabled.
3175 cmd
->transport_emulate_cdb
=
3176 (su_dev
->t10_pr
.res_type
!=
3178 core_scsi2_emulate_crh
: NULL
;
3179 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3184 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3185 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3187 if (cdb
[0] == RELEASE_10
)
3188 size
= (cdb
[7] << 8) | cdb
[8];
3190 size
= cmd
->data_length
;
3192 cmd
->transport_emulate_cdb
=
3193 (su_dev
->t10_pr
.res_type
!=
3195 core_scsi2_emulate_crh
: NULL
;
3196 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3198 case SYNCHRONIZE_CACHE
:
3199 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3201 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3203 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3204 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3205 cmd
->t_task_lba
= transport_lba_32(cdb
);
3207 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3208 cmd
->t_task_lba
= transport_lba_64(cdb
);
3211 goto out_unsupported_cdb
;
3213 size
= transport_get_size(sectors
, cdb
, cmd
);
3214 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3217 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3219 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3222 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3223 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3225 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3227 * Check to ensure that LBA + Range does not exceed past end of
3228 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3230 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
3231 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3232 goto out_invalid_cdb_field
;
3236 size
= get_unaligned_be16(&cdb
[7]);
3237 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3240 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3242 goto out_unsupported_cdb
;
3245 size
= transport_get_size(1, cdb
, cmd
);
3247 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3248 goto out_invalid_cdb_field
;
3251 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
3252 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3254 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3255 goto out_invalid_cdb_field
;
3258 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3260 goto out_unsupported_cdb
;
3263 size
= transport_get_size(1, cdb
, cmd
);
3265 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3266 goto out_invalid_cdb_field
;
3269 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3270 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3272 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3273 * of byte 1 bit 3 UNMAP instead of original reserved field
3275 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3276 goto out_invalid_cdb_field
;
3278 case ALLOW_MEDIUM_REMOVAL
:
3279 case GPCMD_CLOSE_TRACK
:
3281 case INITIALIZE_ELEMENT_STATUS
:
3282 case GPCMD_LOAD_UNLOAD
:
3285 case GPCMD_SET_SPEED
:
3288 case TEST_UNIT_READY
:
3290 case WRITE_FILEMARKS
:
3292 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3295 cmd
->transport_emulate_cdb
=
3296 transport_core_report_lun_response
;
3297 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3299 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3300 * See spc4r17 section 5.3
3302 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3303 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3304 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3307 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3308 " 0x%02x, sending CHECK_CONDITION.\n",
3309 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3310 goto out_unsupported_cdb
;
3313 if (size
!= cmd
->data_length
) {
3314 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3315 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3316 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3317 cmd
->data_length
, size
, cdb
[0]);
3319 cmd
->cmd_spdtl
= size
;
3321 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3322 pr_err("Rejecting underflow/overflow"
3324 goto out_invalid_cdb_field
;
3327 * Reject READ_* or WRITE_* with overflow/underflow for
3328 * type SCF_SCSI_DATA_SG_IO_CDB.
3330 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3331 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3332 " CDB on non 512-byte sector setup subsystem"
3333 " plugin: %s\n", dev
->transport
->name
);
3334 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3335 goto out_invalid_cdb_field
;
3338 if (size
> cmd
->data_length
) {
3339 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3340 cmd
->residual_count
= (size
- cmd
->data_length
);
3342 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3343 cmd
->residual_count
= (cmd
->data_length
- size
);
3345 cmd
->data_length
= size
;
3348 /* Let's limit control cdbs to a page, for simplicity's sake. */
3349 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3351 goto out_invalid_cdb_field
;
3353 transport_set_supported_SAM_opcode(cmd
);
3356 out_unsupported_cdb
:
3357 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3358 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3360 out_invalid_cdb_field
:
3361 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3362 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3367 * Called from transport_generic_complete_ok() and
3368 * transport_generic_request_failure() to determine which dormant/delayed
3369 * and ordered cmds need to have their tasks added to the execution queue.
3371 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3373 struct se_device
*dev
= cmd
->se_dev
;
3374 struct se_cmd
*cmd_p
, *cmd_tmp
;
3375 int new_active_tasks
= 0;
3377 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3378 atomic_dec(&dev
->simple_cmds
);
3379 smp_mb__after_atomic_dec();
3380 dev
->dev_cur_ordered_id
++;
3381 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3382 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3383 cmd
->se_ordered_id
);
3384 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3385 atomic_dec(&dev
->dev_hoq_count
);
3386 smp_mb__after_atomic_dec();
3387 dev
->dev_cur_ordered_id
++;
3388 pr_debug("Incremented dev_cur_ordered_id: %u for"
3389 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3390 cmd
->se_ordered_id
);
3391 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3392 spin_lock(&dev
->ordered_cmd_lock
);
3393 list_del(&cmd
->se_ordered_node
);
3394 atomic_dec(&dev
->dev_ordered_sync
);
3395 smp_mb__after_atomic_dec();
3396 spin_unlock(&dev
->ordered_cmd_lock
);
3398 dev
->dev_cur_ordered_id
++;
3399 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3400 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3403 * Process all commands up to the last received
3404 * ORDERED task attribute which requires another blocking
3407 spin_lock(&dev
->delayed_cmd_lock
);
3408 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3409 &dev
->delayed_cmd_list
, se_delayed_node
) {
3411 list_del(&cmd_p
->se_delayed_node
);
3412 spin_unlock(&dev
->delayed_cmd_lock
);
3414 pr_debug("Calling add_tasks() for"
3415 " cmd_p: 0x%02x Task Attr: 0x%02x"
3416 " Dormant -> Active, se_ordered_id: %u\n",
3417 cmd_p
->t_task_cdb
[0],
3418 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3420 transport_add_tasks_from_cmd(cmd_p
);
3423 spin_lock(&dev
->delayed_cmd_lock
);
3424 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3427 spin_unlock(&dev
->delayed_cmd_lock
);
3429 * If new tasks have become active, wake up the transport thread
3430 * to do the processing of the Active tasks.
3432 if (new_active_tasks
!= 0)
3433 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3436 static void transport_complete_qf(struct se_cmd
*cmd
)
3440 transport_stop_all_task_timers(cmd
);
3441 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3442 transport_complete_task_attr(cmd
);
3444 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3445 ret
= cmd
->se_tfo
->queue_status(cmd
);
3450 switch (cmd
->data_direction
) {
3451 case DMA_FROM_DEVICE
:
3452 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3455 if (cmd
->t_bidi_data_sg
) {
3456 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3460 /* Fall through for DMA_TO_DEVICE */
3462 ret
= cmd
->se_tfo
->queue_status(cmd
);
3470 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3473 transport_lun_remove_cmd(cmd
);
3474 transport_cmd_check_stop_to_fabric(cmd
);
3477 static void transport_handle_queue_full(
3479 struct se_device
*dev
)
3481 spin_lock_irq(&dev
->qf_cmd_lock
);
3482 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3483 atomic_inc(&dev
->dev_qf_count
);
3484 smp_mb__after_atomic_inc();
3485 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3487 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3490 static void transport_generic_complete_ok(struct se_cmd
*cmd
)
3492 int reason
= 0, ret
;
3494 * Check if we need to move delayed/dormant tasks from cmds on the
3495 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3498 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3499 transport_complete_task_attr(cmd
);
3501 * Check to schedule QUEUE_FULL work, or execute an existing
3502 * cmd->transport_qf_callback()
3504 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3505 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3508 * Check if we need to retrieve a sense buffer from
3509 * the struct se_cmd in question.
3511 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3512 if (transport_get_sense_data(cmd
) < 0)
3513 reason
= TCM_NON_EXISTENT_LUN
;
3516 * Only set when an struct se_task->task_scsi_status returned
3517 * a non GOOD status.
3519 if (cmd
->scsi_status
) {
3520 ret
= transport_send_check_condition_and_sense(
3525 transport_lun_remove_cmd(cmd
);
3526 transport_cmd_check_stop_to_fabric(cmd
);
3531 * Check for a callback, used by amongst other things
3532 * XDWRITE_READ_10 emulation.
3534 if (cmd
->transport_complete_callback
)
3535 cmd
->transport_complete_callback(cmd
);
3537 switch (cmd
->data_direction
) {
3538 case DMA_FROM_DEVICE
:
3539 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3540 if (cmd
->se_lun
->lun_sep
) {
3541 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3544 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3546 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3551 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3552 if (cmd
->se_lun
->lun_sep
) {
3553 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3556 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3558 * Check if we need to send READ payload for BIDI-COMMAND
3560 if (cmd
->t_bidi_data_sg
) {
3561 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3562 if (cmd
->se_lun
->lun_sep
) {
3563 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3566 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3567 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3572 /* Fall through for DMA_TO_DEVICE */
3574 ret
= cmd
->se_tfo
->queue_status(cmd
);
3582 transport_lun_remove_cmd(cmd
);
3583 transport_cmd_check_stop_to_fabric(cmd
);
3587 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3588 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3589 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3590 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3593 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3595 struct se_task
*task
, *task_tmp
;
3596 unsigned long flags
;
3597 LIST_HEAD(dispose_list
);
3599 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3600 list_for_each_entry_safe(task
, task_tmp
,
3601 &cmd
->t_task_list
, t_list
) {
3602 if (!(task
->task_flags
& TF_ACTIVE
))
3603 list_move_tail(&task
->t_list
, &dispose_list
);
3605 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3607 while (!list_empty(&dispose_list
)) {
3608 task
= list_first_entry(&dispose_list
, struct se_task
, t_list
);
3610 kfree(task
->task_sg_bidi
);
3611 kfree(task
->task_sg
);
3613 list_del(&task
->t_list
);
3615 cmd
->se_dev
->transport
->free_task(task
);
3619 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3621 struct scatterlist
*sg
;
3624 for_each_sg(sgl
, sg
, nents
, count
)
3625 __free_page(sg_page(sg
));
3630 static inline void transport_free_pages(struct se_cmd
*cmd
)
3632 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3635 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3636 cmd
->t_data_sg
= NULL
;
3637 cmd
->t_data_nents
= 0;
3639 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3640 cmd
->t_bidi_data_sg
= NULL
;
3641 cmd
->t_bidi_data_nents
= 0;
3645 * transport_put_cmd - release a reference to a command
3646 * @cmd: command to release
3648 * This routine releases our reference to the command and frees it if possible.
3650 static void transport_put_cmd(struct se_cmd
*cmd
)
3652 unsigned long flags
;
3655 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3656 if (atomic_read(&cmd
->t_fe_count
)) {
3657 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3661 if (atomic_read(&cmd
->t_se_count
)) {
3662 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3666 if (atomic_read(&cmd
->transport_dev_active
)) {
3667 atomic_set(&cmd
->transport_dev_active
, 0);
3668 transport_all_task_dev_remove_state(cmd
);
3671 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3673 if (free_tasks
!= 0)
3674 transport_free_dev_tasks(cmd
);
3676 transport_free_pages(cmd
);
3677 transport_release_cmd(cmd
);
3680 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3684 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3685 * allocating in the core.
3686 * @cmd: Associated se_cmd descriptor
3687 * @mem: SGL style memory for TCM WRITE / READ
3688 * @sg_mem_num: Number of SGL elements
3689 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3690 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3692 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3695 int transport_generic_map_mem_to_cmd(
3697 struct scatterlist
*sgl
,
3699 struct scatterlist
*sgl_bidi
,
3702 if (!sgl
|| !sgl_count
)
3705 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3706 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3708 cmd
->t_data_sg
= sgl
;
3709 cmd
->t_data_nents
= sgl_count
;
3711 if (sgl_bidi
&& sgl_bidi_count
) {
3712 cmd
->t_bidi_data_sg
= sgl_bidi
;
3713 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3715 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3720 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3722 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
3724 struct se_device
*dev
= cmd
->se_dev
;
3725 int set_counts
= 1, rc
, task_cdbs
;
3728 * Setup any BIDI READ tasks and memory from
3729 * cmd->t_mem_bidi_list so the READ struct se_tasks
3730 * are queued first for the non pSCSI passthrough case.
3732 if (cmd
->t_bidi_data_sg
&&
3733 (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
3734 rc
= transport_allocate_tasks(cmd
,
3737 cmd
->t_bidi_data_sg
,
3738 cmd
->t_bidi_data_nents
);
3740 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3741 cmd
->scsi_sense_reason
=
3742 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3745 atomic_inc(&cmd
->t_fe_count
);
3746 atomic_inc(&cmd
->t_se_count
);
3750 * Setup the tasks and memory from cmd->t_mem_list
3751 * Note for BIDI transfers this will contain the WRITE payload
3753 task_cdbs
= transport_allocate_tasks(cmd
,
3755 cmd
->data_direction
,
3758 if (task_cdbs
<= 0) {
3759 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3760 cmd
->scsi_sense_reason
=
3761 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3766 atomic_inc(&cmd
->t_fe_count
);
3767 atomic_inc(&cmd
->t_se_count
);
3770 cmd
->t_task_list_num
= task_cdbs
;
3772 atomic_set(&cmd
->t_task_cdbs_left
, task_cdbs
);
3773 atomic_set(&cmd
->t_task_cdbs_ex_left
, task_cdbs
);
3774 atomic_set(&cmd
->t_task_cdbs_timeout_left
, task_cdbs
);
3778 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3780 struct scatterlist
*sg
= cmd
->t_data_sg
;
3784 * We need to take into account a possible offset here for fabrics like
3785 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3786 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3788 return kmap(sg_page(sg
)) + sg
->offset
;
3790 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3792 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3794 kunmap(sg_page(cmd
->t_data_sg
));
3796 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3799 transport_generic_get_mem(struct se_cmd
*cmd
)
3801 u32 length
= cmd
->data_length
;
3806 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3807 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3808 if (!cmd
->t_data_sg
)
3811 cmd
->t_data_nents
= nents
;
3812 sg_init_table(cmd
->t_data_sg
, nents
);
3815 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3816 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3820 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3828 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3831 kfree(cmd
->t_data_sg
);
3832 cmd
->t_data_sg
= NULL
;
3836 /* Reduce sectors if they are too long for the device */
3837 static inline sector_t
transport_limit_task_sectors(
3838 struct se_device
*dev
,
3839 unsigned long long lba
,
3842 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3844 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3845 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3846 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3853 * This function can be used by HW target mode drivers to create a linked
3854 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3855 * This is intended to be called during the completion path by TCM Core
3856 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3858 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3860 struct scatterlist
*sg_first
= NULL
;
3861 struct scatterlist
*sg_prev
= NULL
;
3862 int sg_prev_nents
= 0;
3863 struct scatterlist
*sg
;
3864 struct se_task
*task
;
3865 u32 chained_nents
= 0;
3868 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3871 * Walk the struct se_task list and setup scatterlist chains
3872 * for each contiguously allocated struct se_task->task_sg[].
3874 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3879 sg_first
= task
->task_sg
;
3880 chained_nents
= task
->task_sg_nents
;
3882 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3883 chained_nents
+= task
->task_sg_nents
;
3886 * For the padded tasks, use the extra SGL vector allocated
3887 * in transport_allocate_data_tasks() for the sg_prev_nents
3888 * offset into sg_chain() above.
3890 * We do not need the padding for the last task (or a single
3891 * task), but in that case we will never use the sg_prev_nents
3892 * value below which would be incorrect.
3894 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3895 sg_prev
= task
->task_sg
;
3898 * Setup the starting pointer and total t_tasks_sg_linked_no including
3899 * padding SGs for linking and to mark the end.
3901 cmd
->t_tasks_sg_chained
= sg_first
;
3902 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3904 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3905 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3906 cmd
->t_tasks_sg_chained_no
);
3908 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
3909 cmd
->t_tasks_sg_chained_no
, i
) {
3911 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3912 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
3913 if (sg_is_chain(sg
))
3914 pr_debug("SG: %p sg_is_chain=1\n", sg
);
3916 pr_debug("SG: %p sg_is_last=1\n", sg
);
3919 EXPORT_SYMBOL(transport_do_task_sg_chain
);
3922 * Break up cmd into chunks transport can handle
3924 static int transport_allocate_data_tasks(
3926 unsigned long long lba
,
3927 enum dma_data_direction data_direction
,
3928 struct scatterlist
*sgl
,
3929 unsigned int sgl_nents
)
3931 struct se_task
*task
;
3932 struct se_device
*dev
= cmd
->se_dev
;
3933 unsigned long flags
;
3935 sector_t sectors
, dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
3936 u32 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
3937 struct scatterlist
*sg
;
3938 struct scatterlist
*cmd_sg
;
3940 WARN_ON(cmd
->data_length
% sector_size
);
3941 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
3942 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
3945 for (i
= 0; i
< task_count
; i
++) {
3946 unsigned int task_size
, task_sg_nents_padded
;
3949 task
= transport_generic_get_task(cmd
, data_direction
);
3953 task
->task_lba
= lba
;
3954 task
->task_sectors
= min(sectors
, dev_max_sectors
);
3955 task
->task_size
= task
->task_sectors
* sector_size
;
3958 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3959 * in order to calculate the number per task SGL entries
3961 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
3963 * Check if the fabric module driver is requesting that all
3964 * struct se_task->task_sg[] be chained together.. If so,
3965 * then allocate an extra padding SG entry for linking and
3966 * marking the end of the chained SGL for every task except
3967 * the last one for (task_count > 1) operation, or skipping
3968 * the extra padding for the (task_count == 1) case.
3970 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
3971 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
3973 task_sg_nents_padded
= task
->task_sg_nents
;
3975 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
3976 task_sg_nents_padded
, GFP_KERNEL
);
3977 if (!task
->task_sg
) {
3978 cmd
->se_dev
->transport
->free_task(task
);
3982 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
3984 task_size
= task
->task_size
;
3986 /* Build new sgl, only up to task_size */
3987 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
3988 if (cmd_sg
->length
> task_size
)
3992 task_size
-= cmd_sg
->length
;
3993 cmd_sg
= sg_next(cmd_sg
);
3996 lba
+= task
->task_sectors
;
3997 sectors
-= task
->task_sectors
;
3999 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4000 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4001 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4008 transport_allocate_control_task(struct se_cmd
*cmd
)
4010 struct se_task
*task
;
4011 unsigned long flags
;
4013 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
4017 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
4019 if (!task
->task_sg
) {
4020 cmd
->se_dev
->transport
->free_task(task
);
4024 memcpy(task
->task_sg
, cmd
->t_data_sg
,
4025 sizeof(struct scatterlist
) * cmd
->t_data_nents
);
4026 task
->task_size
= cmd
->data_length
;
4027 task
->task_sg_nents
= cmd
->t_data_nents
;
4029 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4030 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4031 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4033 /* Success! Return number of tasks allocated */
4037 static u32
transport_allocate_tasks(
4039 unsigned long long lba
,
4040 enum dma_data_direction data_direction
,
4041 struct scatterlist
*sgl
,
4042 unsigned int sgl_nents
)
4044 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
4045 if (transport_cmd_get_valid_sectors(cmd
) < 0)
4048 return transport_allocate_data_tasks(cmd
, lba
, data_direction
,
4051 return transport_allocate_control_task(cmd
);
4056 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4058 * Allocate storage transport resources from a set of values predefined
4059 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4060 * Any non zero return here is treated as an "out of resource' op here.
4063 * Generate struct se_task(s) and/or their payloads for this CDB.
4065 int transport_generic_new_cmd(struct se_cmd
*cmd
)
4070 * Determine is the TCM fabric module has already allocated physical
4071 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4074 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
4076 ret
= transport_generic_get_mem(cmd
);
4081 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4082 * control or data CDB types, and perform the map to backend subsystem
4083 * code from SGL memory allocated here by transport_generic_get_mem(), or
4084 * via pre-existing SGL memory setup explictly by fabric module code with
4085 * transport_generic_map_mem_to_cmd().
4087 ret
= transport_new_cmd_obj(cmd
);
4091 * For WRITEs, let the fabric know its buffer is ready..
4092 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4093 * will be added to the struct se_device execution queue after its WRITE
4094 * data has arrived. (ie: It gets handled by the transport processing
4095 * thread a second time)
4097 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4098 transport_add_tasks_to_state_queue(cmd
);
4099 return transport_generic_write_pending(cmd
);
4102 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4103 * to the execution queue.
4105 transport_execute_tasks(cmd
);
4108 EXPORT_SYMBOL(transport_generic_new_cmd
);
4110 /* transport_generic_process_write():
4114 void transport_generic_process_write(struct se_cmd
*cmd
)
4116 transport_execute_tasks(cmd
);
4118 EXPORT_SYMBOL(transport_generic_process_write
);
4120 static void transport_write_pending_qf(struct se_cmd
*cmd
)
4122 if (cmd
->se_tfo
->write_pending(cmd
) == -EAGAIN
) {
4123 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4125 transport_handle_queue_full(cmd
, cmd
->se_dev
);
4129 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4131 unsigned long flags
;
4134 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4135 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4136 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4139 * Clear the se_cmd for WRITE_PENDING status in order to set
4140 * cmd->t_transport_active=0 so that transport_generic_handle_data
4141 * can be called from HW target mode interrupt code. This is safe
4142 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4143 * because the se_cmd->se_lun pointer is not being cleared.
4145 transport_cmd_check_stop(cmd
, 1, 0);
4148 * Call the fabric write_pending function here to let the
4149 * frontend know that WRITE buffers are ready.
4151 ret
= cmd
->se_tfo
->write_pending(cmd
);
4157 return PYX_TRANSPORT_WRITE_PENDING
;
4160 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4161 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4162 transport_handle_queue_full(cmd
, cmd
->se_dev
);
4167 * transport_release_cmd - free a command
4168 * @cmd: command to free
4170 * This routine unconditionally frees a command, and reference counting
4171 * or list removal must be done in the caller.
4173 void transport_release_cmd(struct se_cmd
*cmd
)
4175 BUG_ON(!cmd
->se_tfo
);
4177 if (cmd
->se_tmr_req
)
4178 core_tmr_release_req(cmd
->se_tmr_req
);
4179 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
4180 kfree(cmd
->t_task_cdb
);
4181 cmd
->se_tfo
->release_cmd(cmd
);
4183 EXPORT_SYMBOL(transport_release_cmd
);
4185 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
4187 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
4188 if (wait_for_tasks
&& cmd
->se_tmr_req
)
4189 transport_wait_for_tasks(cmd
);
4191 transport_release_cmd(cmd
);
4194 transport_wait_for_tasks(cmd
);
4196 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4199 transport_lun_remove_cmd(cmd
);
4201 transport_free_dev_tasks(cmd
);
4203 transport_put_cmd(cmd
);
4206 EXPORT_SYMBOL(transport_generic_free_cmd
);
4208 /* transport_lun_wait_for_tasks():
4210 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4211 * an struct se_lun to be successfully shutdown.
4213 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4215 unsigned long flags
;
4218 * If the frontend has already requested this struct se_cmd to
4219 * be stopped, we can safely ignore this struct se_cmd.
4221 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4222 if (atomic_read(&cmd
->t_transport_stop
)) {
4223 atomic_set(&cmd
->transport_lun_stop
, 0);
4224 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4225 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4226 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4227 transport_cmd_check_stop(cmd
, 1, 0);
4230 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4231 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4233 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4235 ret
= transport_stop_tasks_for_cmd(cmd
);
4237 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4238 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4240 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4241 cmd
->se_tfo
->get_task_tag(cmd
));
4242 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4243 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4244 cmd
->se_tfo
->get_task_tag(cmd
));
4246 transport_remove_cmd_from_queue(cmd
);
4251 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4253 struct se_cmd
*cmd
= NULL
;
4254 unsigned long lun_flags
, cmd_flags
;
4256 * Do exception processing and return CHECK_CONDITION status to the
4259 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4260 while (!list_empty(&lun
->lun_cmd_list
)) {
4261 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4262 struct se_cmd
, se_lun_node
);
4263 list_del(&cmd
->se_lun_node
);
4265 atomic_set(&cmd
->transport_lun_active
, 0);
4267 * This will notify iscsi_target_transport.c:
4268 * transport_cmd_check_stop() that a LUN shutdown is in
4269 * progress for the iscsi_cmd_t.
4271 spin_lock(&cmd
->t_state_lock
);
4272 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4273 "_lun_stop for ITT: 0x%08x\n",
4274 cmd
->se_lun
->unpacked_lun
,
4275 cmd
->se_tfo
->get_task_tag(cmd
));
4276 atomic_set(&cmd
->transport_lun_stop
, 1);
4277 spin_unlock(&cmd
->t_state_lock
);
4279 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4282 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4283 cmd
->se_tfo
->get_task_tag(cmd
),
4284 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4288 * If the Storage engine still owns the iscsi_cmd_t, determine
4289 * and/or stop its context.
4291 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4292 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4293 cmd
->se_tfo
->get_task_tag(cmd
));
4295 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4296 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4300 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4301 "_wait_for_tasks(): SUCCESS\n",
4302 cmd
->se_lun
->unpacked_lun
,
4303 cmd
->se_tfo
->get_task_tag(cmd
));
4305 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4306 if (!atomic_read(&cmd
->transport_dev_active
)) {
4307 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4310 atomic_set(&cmd
->transport_dev_active
, 0);
4311 transport_all_task_dev_remove_state(cmd
);
4312 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4314 transport_free_dev_tasks(cmd
);
4316 * The Storage engine stopped this struct se_cmd before it was
4317 * send to the fabric frontend for delivery back to the
4318 * Initiator Node. Return this SCSI CDB back with an
4319 * CHECK_CONDITION status.
4322 transport_send_check_condition_and_sense(cmd
,
4323 TCM_NON_EXISTENT_LUN
, 0);
4325 * If the fabric frontend is waiting for this iscsi_cmd_t to
4326 * be released, notify the waiting thread now that LU has
4327 * finished accessing it.
4329 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4330 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4331 pr_debug("SE_LUN[%d] - Detected FE stop for"
4332 " struct se_cmd: %p ITT: 0x%08x\n",
4334 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4336 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4338 transport_cmd_check_stop(cmd
, 1, 0);
4339 complete(&cmd
->transport_lun_fe_stop_comp
);
4340 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4343 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4344 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4346 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4347 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4349 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4352 static int transport_clear_lun_thread(void *p
)
4354 struct se_lun
*lun
= (struct se_lun
*)p
;
4356 __transport_clear_lun_from_sessions(lun
);
4357 complete(&lun
->lun_shutdown_comp
);
4362 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4364 struct task_struct
*kt
;
4366 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4367 "tcm_cl_%u", lun
->unpacked_lun
);
4369 pr_err("Unable to start clear_lun thread\n");
4372 wait_for_completion(&lun
->lun_shutdown_comp
);
4378 * transport_wait_for_tasks - wait for completion to occur
4379 * @cmd: command to wait
4381 * Called from frontend fabric context to wait for storage engine
4382 * to pause and/or release frontend generated struct se_cmd.
4384 void transport_wait_for_tasks(struct se_cmd
*cmd
)
4386 unsigned long flags
;
4388 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4389 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
)) {
4390 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4394 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4395 * has been set in transport_set_supported_SAM_opcode().
4397 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) && !cmd
->se_tmr_req
) {
4398 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4402 * If we are already stopped due to an external event (ie: LUN shutdown)
4403 * sleep until the connection can have the passed struct se_cmd back.
4404 * The cmd->transport_lun_stopped_sem will be upped by
4405 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4406 * has completed its operation on the struct se_cmd.
4408 if (atomic_read(&cmd
->transport_lun_stop
)) {
4410 pr_debug("wait_for_tasks: Stopping"
4411 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4412 "_stop_comp); for ITT: 0x%08x\n",
4413 cmd
->se_tfo
->get_task_tag(cmd
));
4415 * There is a special case for WRITES where a FE exception +
4416 * LUN shutdown means ConfigFS context is still sleeping on
4417 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4418 * We go ahead and up transport_lun_stop_comp just to be sure
4421 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4422 complete(&cmd
->transport_lun_stop_comp
);
4423 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4424 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4426 transport_all_task_dev_remove_state(cmd
);
4428 * At this point, the frontend who was the originator of this
4429 * struct se_cmd, now owns the structure and can be released through
4430 * normal means below.
4432 pr_debug("wait_for_tasks: Stopped"
4433 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4434 "stop_comp); for ITT: 0x%08x\n",
4435 cmd
->se_tfo
->get_task_tag(cmd
));
4437 atomic_set(&cmd
->transport_lun_stop
, 0);
4439 if (!atomic_read(&cmd
->t_transport_active
) ||
4440 atomic_read(&cmd
->t_transport_aborted
)) {
4441 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4445 atomic_set(&cmd
->t_transport_stop
, 1);
4447 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4448 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4449 " = TRUE\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4450 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
,
4451 cmd
->deferred_t_state
);
4453 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4455 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4457 wait_for_completion(&cmd
->t_transport_stop_comp
);
4459 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4460 atomic_set(&cmd
->t_transport_active
, 0);
4461 atomic_set(&cmd
->t_transport_stop
, 0);
4463 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4464 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4465 cmd
->se_tfo
->get_task_tag(cmd
));
4467 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4469 EXPORT_SYMBOL(transport_wait_for_tasks
);
4471 static int transport_get_sense_codes(
4476 *asc
= cmd
->scsi_asc
;
4477 *ascq
= cmd
->scsi_ascq
;
4482 static int transport_set_sense_codes(
4487 cmd
->scsi_asc
= asc
;
4488 cmd
->scsi_ascq
= ascq
;
4493 int transport_send_check_condition_and_sense(
4498 unsigned char *buffer
= cmd
->sense_buffer
;
4499 unsigned long flags
;
4501 u8 asc
= 0, ascq
= 0;
4503 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4504 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4505 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4508 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4509 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4511 if (!reason
&& from_transport
)
4514 if (!from_transport
)
4515 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4517 * Data Segment and SenseLength of the fabric response PDU.
4519 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4520 * from include/scsi/scsi_cmnd.h
4522 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4523 TRANSPORT_SENSE_BUFFER
);
4525 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4526 * SENSE KEY values from include/scsi/scsi.h
4529 case TCM_NON_EXISTENT_LUN
:
4531 buffer
[offset
] = 0x70;
4532 /* ILLEGAL REQUEST */
4533 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4534 /* LOGICAL UNIT NOT SUPPORTED */
4535 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4537 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4538 case TCM_SECTOR_COUNT_TOO_MANY
:
4540 buffer
[offset
] = 0x70;
4541 /* ILLEGAL REQUEST */
4542 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4543 /* INVALID COMMAND OPERATION CODE */
4544 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4546 case TCM_UNKNOWN_MODE_PAGE
:
4548 buffer
[offset
] = 0x70;
4549 /* ILLEGAL REQUEST */
4550 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4551 /* INVALID FIELD IN CDB */
4552 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4554 case TCM_CHECK_CONDITION_ABORT_CMD
:
4556 buffer
[offset
] = 0x70;
4557 /* ABORTED COMMAND */
4558 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4559 /* BUS DEVICE RESET FUNCTION OCCURRED */
4560 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4561 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4563 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4565 buffer
[offset
] = 0x70;
4566 /* ABORTED COMMAND */
4567 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4569 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4570 /* NOT ENOUGH UNSOLICITED DATA */
4571 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4573 case TCM_INVALID_CDB_FIELD
:
4575 buffer
[offset
] = 0x70;
4576 /* ABORTED COMMAND */
4577 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4578 /* INVALID FIELD IN CDB */
4579 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4581 case TCM_INVALID_PARAMETER_LIST
:
4583 buffer
[offset
] = 0x70;
4584 /* ABORTED COMMAND */
4585 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4586 /* INVALID FIELD IN PARAMETER LIST */
4587 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4589 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4591 buffer
[offset
] = 0x70;
4592 /* ABORTED COMMAND */
4593 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4595 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4596 /* UNEXPECTED_UNSOLICITED_DATA */
4597 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4599 case TCM_SERVICE_CRC_ERROR
:
4601 buffer
[offset
] = 0x70;
4602 /* ABORTED COMMAND */
4603 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4604 /* PROTOCOL SERVICE CRC ERROR */
4605 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4607 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4609 case TCM_SNACK_REJECTED
:
4611 buffer
[offset
] = 0x70;
4612 /* ABORTED COMMAND */
4613 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4615 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4616 /* FAILED RETRANSMISSION REQUEST */
4617 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4619 case TCM_WRITE_PROTECTED
:
4621 buffer
[offset
] = 0x70;
4623 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4624 /* WRITE PROTECTED */
4625 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4627 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4629 buffer
[offset
] = 0x70;
4630 /* UNIT ATTENTION */
4631 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4632 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4633 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4634 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4636 case TCM_CHECK_CONDITION_NOT_READY
:
4638 buffer
[offset
] = 0x70;
4640 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4641 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4642 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4643 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4645 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4648 buffer
[offset
] = 0x70;
4649 /* ILLEGAL REQUEST */
4650 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4651 /* LOGICAL UNIT COMMUNICATION FAILURE */
4652 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4656 * This code uses linux/include/scsi/scsi.h SAM status codes!
4658 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4660 * Automatically padded, this value is encoded in the fabric's
4661 * data_length response PDU containing the SCSI defined sense data.
4663 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4666 return cmd
->se_tfo
->queue_status(cmd
);
4668 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4670 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4674 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4676 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4679 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4680 " status for CDB: 0x%02x ITT: 0x%08x\n",
4682 cmd
->se_tfo
->get_task_tag(cmd
));
4684 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4685 cmd
->se_tfo
->queue_status(cmd
);
4690 EXPORT_SYMBOL(transport_check_aborted_status
);
4692 void transport_send_task_abort(struct se_cmd
*cmd
)
4694 unsigned long flags
;
4696 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4697 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4698 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4701 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4704 * If there are still expected incoming fabric WRITEs, we wait
4705 * until until they have completed before sending a TASK_ABORTED
4706 * response. This response with TASK_ABORTED status will be
4707 * queued back to fabric module by transport_check_aborted_status().
4709 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4710 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4711 atomic_inc(&cmd
->t_transport_aborted
);
4712 smp_mb__after_atomic_inc();
4713 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4714 transport_new_cmd_failure(cmd
);
4718 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4720 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4721 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4722 cmd
->se_tfo
->get_task_tag(cmd
));
4724 cmd
->se_tfo
->queue_status(cmd
);
4727 /* transport_generic_do_tmr():
4731 int transport_generic_do_tmr(struct se_cmd
*cmd
)
4733 struct se_device
*dev
= cmd
->se_dev
;
4734 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4737 switch (tmr
->function
) {
4738 case TMR_ABORT_TASK
:
4739 tmr
->response
= TMR_FUNCTION_REJECTED
;
4741 case TMR_ABORT_TASK_SET
:
4743 case TMR_CLEAR_TASK_SET
:
4744 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4747 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4748 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4749 TMR_FUNCTION_REJECTED
;
4751 case TMR_TARGET_WARM_RESET
:
4752 tmr
->response
= TMR_FUNCTION_REJECTED
;
4754 case TMR_TARGET_COLD_RESET
:
4755 tmr
->response
= TMR_FUNCTION_REJECTED
;
4758 pr_err("Uknown TMR function: 0x%02x.\n",
4760 tmr
->response
= TMR_FUNCTION_REJECTED
;
4764 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4765 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4767 transport_cmd_check_stop_to_fabric(cmd
);
4771 /* transport_processing_thread():
4775 static int transport_processing_thread(void *param
)
4779 struct se_device
*dev
= (struct se_device
*) param
;
4781 set_user_nice(current
, -20);
4783 while (!kthread_should_stop()) {
4784 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4785 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4786 kthread_should_stop());
4791 __transport_execute_tasks(dev
);
4793 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4797 switch (cmd
->t_state
) {
4798 case TRANSPORT_NEW_CMD
:
4801 case TRANSPORT_NEW_CMD_MAP
:
4802 if (!cmd
->se_tfo
->new_cmd_map
) {
4803 pr_err("cmd->se_tfo->new_cmd_map is"
4804 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4807 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4809 cmd
->transport_error_status
= ret
;
4810 transport_generic_request_failure(cmd
, NULL
,
4811 0, (cmd
->data_direction
!=
4815 ret
= transport_generic_new_cmd(cmd
);
4819 cmd
->transport_error_status
= ret
;
4820 transport_generic_request_failure(cmd
, NULL
,
4821 0, (cmd
->data_direction
!=
4825 case TRANSPORT_PROCESS_WRITE
:
4826 transport_generic_process_write(cmd
);
4828 case TRANSPORT_COMPLETE_OK
:
4829 transport_stop_all_task_timers(cmd
);
4830 transport_generic_complete_ok(cmd
);
4832 case TRANSPORT_REMOVE
:
4833 transport_put_cmd(cmd
);
4835 case TRANSPORT_FREE_CMD_INTR
:
4836 transport_generic_free_cmd(cmd
, 0);
4838 case TRANSPORT_PROCESS_TMR
:
4839 transport_generic_do_tmr(cmd
);
4841 case TRANSPORT_COMPLETE_FAILURE
:
4842 transport_generic_request_failure(cmd
, NULL
, 1, 1);
4844 case TRANSPORT_COMPLETE_TIMEOUT
:
4845 transport_stop_all_task_timers(cmd
);
4846 transport_generic_request_timeout(cmd
);
4848 case TRANSPORT_COMPLETE_QF_WP
:
4849 transport_write_pending_qf(cmd
);
4851 case TRANSPORT_COMPLETE_QF_OK
:
4852 transport_complete_qf(cmd
);
4855 pr_err("Unknown t_state: %d deferred_t_state:"
4856 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
4857 " %u\n", cmd
->t_state
, cmd
->deferred_t_state
,
4858 cmd
->se_tfo
->get_task_tag(cmd
),
4859 cmd
->se_tfo
->get_cmd_state(cmd
),
4860 cmd
->se_lun
->unpacked_lun
);
4868 WARN_ON(!list_empty(&dev
->state_task_list
));
4869 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4870 dev
->process_thread
= NULL
;