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_scdb.h"
58 #include "target_core_ua.h"
60 static int sub_api_initialized
;
62 static struct kmem_cache
*se_cmd_cache
;
63 static struct kmem_cache
*se_sess_cache
;
64 struct kmem_cache
*se_tmr_req_cache
;
65 struct kmem_cache
*se_ua_cache
;
66 struct kmem_cache
*t10_pr_reg_cache
;
67 struct kmem_cache
*t10_alua_lu_gp_cache
;
68 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
69 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
70 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
72 static int transport_generic_write_pending(struct se_cmd
*);
73 static int transport_processing_thread(void *param
);
74 static int __transport_execute_tasks(struct se_device
*dev
);
75 static void transport_complete_task_attr(struct se_cmd
*cmd
);
76 static int transport_complete_qf(struct se_cmd
*cmd
);
77 static void transport_handle_queue_full(struct se_cmd
*cmd
,
78 struct se_device
*dev
, int (*qf_callback
)(struct se_cmd
*));
79 static void transport_direct_request_timeout(struct se_cmd
*cmd
);
80 static void transport_free_dev_tasks(struct se_cmd
*cmd
);
81 static u32
transport_allocate_tasks(struct se_cmd
*cmd
,
82 unsigned long long starting_lba
,
83 enum dma_data_direction data_direction
,
84 struct scatterlist
*sgl
, unsigned int nents
);
85 static int transport_generic_get_mem(struct se_cmd
*cmd
);
86 static void transport_put_cmd(struct se_cmd
*cmd
);
87 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
88 struct se_queue_obj
*qobj
);
89 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
90 static void transport_stop_all_task_timers(struct se_cmd
*cmd
);
92 int init_se_kmem_caches(void)
94 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
95 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
97 pr_err("kmem_cache_create for struct se_cmd failed\n");
100 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
101 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
103 if (!se_tmr_req_cache
) {
104 pr_err("kmem_cache_create() for struct se_tmr_req"
108 se_sess_cache
= kmem_cache_create("se_sess_cache",
109 sizeof(struct se_session
), __alignof__(struct se_session
),
111 if (!se_sess_cache
) {
112 pr_err("kmem_cache_create() for struct se_session"
116 se_ua_cache
= kmem_cache_create("se_ua_cache",
117 sizeof(struct se_ua
), __alignof__(struct se_ua
),
120 pr_err("kmem_cache_create() for struct se_ua failed\n");
123 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
124 sizeof(struct t10_pr_registration
),
125 __alignof__(struct t10_pr_registration
), 0, NULL
);
126 if (!t10_pr_reg_cache
) {
127 pr_err("kmem_cache_create() for struct t10_pr_registration"
131 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
132 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
134 if (!t10_alua_lu_gp_cache
) {
135 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
139 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
140 sizeof(struct t10_alua_lu_gp_member
),
141 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
142 if (!t10_alua_lu_gp_mem_cache
) {
143 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
147 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
148 sizeof(struct t10_alua_tg_pt_gp
),
149 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
150 if (!t10_alua_tg_pt_gp_cache
) {
151 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
155 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
156 "t10_alua_tg_pt_gp_mem_cache",
157 sizeof(struct t10_alua_tg_pt_gp_member
),
158 __alignof__(struct t10_alua_tg_pt_gp_member
),
160 if (!t10_alua_tg_pt_gp_mem_cache
) {
161 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
169 kmem_cache_destroy(se_cmd_cache
);
170 if (se_tmr_req_cache
)
171 kmem_cache_destroy(se_tmr_req_cache
);
173 kmem_cache_destroy(se_sess_cache
);
175 kmem_cache_destroy(se_ua_cache
);
176 if (t10_pr_reg_cache
)
177 kmem_cache_destroy(t10_pr_reg_cache
);
178 if (t10_alua_lu_gp_cache
)
179 kmem_cache_destroy(t10_alua_lu_gp_cache
);
180 if (t10_alua_lu_gp_mem_cache
)
181 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
182 if (t10_alua_tg_pt_gp_cache
)
183 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
184 if (t10_alua_tg_pt_gp_mem_cache
)
185 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
189 void release_se_kmem_caches(void)
191 kmem_cache_destroy(se_cmd_cache
);
192 kmem_cache_destroy(se_tmr_req_cache
);
193 kmem_cache_destroy(se_sess_cache
);
194 kmem_cache_destroy(se_ua_cache
);
195 kmem_cache_destroy(t10_pr_reg_cache
);
196 kmem_cache_destroy(t10_alua_lu_gp_cache
);
197 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
198 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
199 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
202 /* This code ensures unique mib indexes are handed out. */
203 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
204 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
207 * Allocate a new row index for the entry type specified
209 u32
scsi_get_new_index(scsi_index_t type
)
213 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
215 spin_lock(&scsi_mib_index_lock
);
216 new_index
= ++scsi_mib_index
[type
];
217 spin_unlock(&scsi_mib_index_lock
);
222 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
224 atomic_set(&qobj
->queue_cnt
, 0);
225 INIT_LIST_HEAD(&qobj
->qobj_list
);
226 init_waitqueue_head(&qobj
->thread_wq
);
227 spin_lock_init(&qobj
->cmd_queue_lock
);
229 EXPORT_SYMBOL(transport_init_queue_obj
);
231 static int transport_subsystem_reqmods(void)
235 ret
= request_module("target_core_iblock");
237 pr_err("Unable to load target_core_iblock\n");
239 ret
= request_module("target_core_file");
241 pr_err("Unable to load target_core_file\n");
243 ret
= request_module("target_core_pscsi");
245 pr_err("Unable to load target_core_pscsi\n");
247 ret
= request_module("target_core_stgt");
249 pr_err("Unable to load target_core_stgt\n");
254 int transport_subsystem_check_init(void)
258 if (sub_api_initialized
)
261 * Request the loading of known TCM subsystem plugins..
263 ret
= transport_subsystem_reqmods();
267 sub_api_initialized
= 1;
271 struct se_session
*transport_init_session(void)
273 struct se_session
*se_sess
;
275 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
277 pr_err("Unable to allocate struct se_session from"
279 return ERR_PTR(-ENOMEM
);
281 INIT_LIST_HEAD(&se_sess
->sess_list
);
282 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
286 EXPORT_SYMBOL(transport_init_session
);
289 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
291 void __transport_register_session(
292 struct se_portal_group
*se_tpg
,
293 struct se_node_acl
*se_nacl
,
294 struct se_session
*se_sess
,
295 void *fabric_sess_ptr
)
297 unsigned char buf
[PR_REG_ISID_LEN
];
299 se_sess
->se_tpg
= se_tpg
;
300 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
302 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
304 * Only set for struct se_session's that will actually be moving I/O.
305 * eg: *NOT* discovery sessions.
309 * If the fabric module supports an ISID based TransportID,
310 * save this value in binary from the fabric I_T Nexus now.
312 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
313 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
314 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
315 &buf
[0], PR_REG_ISID_LEN
);
316 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
318 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
320 * The se_nacl->nacl_sess pointer will be set to the
321 * last active I_T Nexus for each struct se_node_acl.
323 se_nacl
->nacl_sess
= se_sess
;
325 list_add_tail(&se_sess
->sess_acl_list
,
326 &se_nacl
->acl_sess_list
);
327 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
329 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
331 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
332 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
334 EXPORT_SYMBOL(__transport_register_session
);
336 void transport_register_session(
337 struct se_portal_group
*se_tpg
,
338 struct se_node_acl
*se_nacl
,
339 struct se_session
*se_sess
,
340 void *fabric_sess_ptr
)
342 spin_lock_bh(&se_tpg
->session_lock
);
343 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
344 spin_unlock_bh(&se_tpg
->session_lock
);
346 EXPORT_SYMBOL(transport_register_session
);
348 void transport_deregister_session_configfs(struct se_session
*se_sess
)
350 struct se_node_acl
*se_nacl
;
353 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
355 se_nacl
= se_sess
->se_node_acl
;
357 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
358 list_del(&se_sess
->sess_acl_list
);
360 * If the session list is empty, then clear the pointer.
361 * Otherwise, set the struct se_session pointer from the tail
362 * element of the per struct se_node_acl active session list.
364 if (list_empty(&se_nacl
->acl_sess_list
))
365 se_nacl
->nacl_sess
= NULL
;
367 se_nacl
->nacl_sess
= container_of(
368 se_nacl
->acl_sess_list
.prev
,
369 struct se_session
, sess_acl_list
);
371 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
374 EXPORT_SYMBOL(transport_deregister_session_configfs
);
376 void transport_free_session(struct se_session
*se_sess
)
378 kmem_cache_free(se_sess_cache
, se_sess
);
380 EXPORT_SYMBOL(transport_free_session
);
382 void transport_deregister_session(struct se_session
*se_sess
)
384 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
385 struct se_node_acl
*se_nacl
;
389 transport_free_session(se_sess
);
393 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
394 list_del(&se_sess
->sess_list
);
395 se_sess
->se_tpg
= NULL
;
396 se_sess
->fabric_sess_ptr
= NULL
;
397 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
400 * Determine if we need to do extra work for this initiator node's
401 * struct se_node_acl if it had been previously dynamically generated.
403 se_nacl
= se_sess
->se_node_acl
;
405 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
406 if (se_nacl
->dynamic_node_acl
) {
407 if (!se_tpg
->se_tpg_tfo
->tpg_check_demo_mode_cache(
409 list_del(&se_nacl
->acl_list
);
410 se_tpg
->num_node_acls
--;
411 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
413 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
414 core_free_device_list_for_node(se_nacl
, se_tpg
);
415 se_tpg
->se_tpg_tfo
->tpg_release_fabric_acl(se_tpg
,
417 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
420 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
423 transport_free_session(se_sess
);
425 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
426 se_tpg
->se_tpg_tfo
->get_fabric_name());
428 EXPORT_SYMBOL(transport_deregister_session
);
431 * Called with cmd->t_state_lock held.
433 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
435 struct se_device
*dev
= cmd
->se_dev
;
436 struct se_task
*task
;
442 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
443 if (task
->task_flags
& TF_ACTIVE
)
446 if (!atomic_read(&task
->task_state_active
))
449 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
450 list_del(&task
->t_state_list
);
451 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
452 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
453 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
455 atomic_set(&task
->task_state_active
, 0);
456 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
460 /* transport_cmd_check_stop():
462 * 'transport_off = 1' determines if t_transport_active should be cleared.
463 * 'transport_off = 2' determines if task_dev_state should be removed.
465 * A non-zero u8 t_state sets cmd->t_state.
466 * Returns 1 when command is stopped, else 0.
468 static int transport_cmd_check_stop(
475 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
477 * Determine if IOCTL context caller in requesting the stopping of this
478 * command for LUN shutdown purposes.
480 if (atomic_read(&cmd
->transport_lun_stop
)) {
481 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
482 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
483 cmd
->se_tfo
->get_task_tag(cmd
));
485 cmd
->deferred_t_state
= cmd
->t_state
;
486 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
487 atomic_set(&cmd
->t_transport_active
, 0);
488 if (transport_off
== 2)
489 transport_all_task_dev_remove_state(cmd
);
490 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
492 complete(&cmd
->transport_lun_stop_comp
);
496 * Determine if frontend context caller is requesting the stopping of
497 * this command for frontend exceptions.
499 if (atomic_read(&cmd
->t_transport_stop
)) {
500 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
501 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
502 cmd
->se_tfo
->get_task_tag(cmd
));
504 cmd
->deferred_t_state
= cmd
->t_state
;
505 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
506 if (transport_off
== 2)
507 transport_all_task_dev_remove_state(cmd
);
510 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
513 if (transport_off
== 2)
515 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
517 complete(&cmd
->t_transport_stop_comp
);
521 atomic_set(&cmd
->t_transport_active
, 0);
522 if (transport_off
== 2) {
523 transport_all_task_dev_remove_state(cmd
);
525 * Clear struct se_cmd->se_lun before the transport_off == 2
526 * handoff to fabric module.
530 * Some fabric modules like tcm_loop can release
531 * their internally allocated I/O reference now and
534 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
535 spin_unlock_irqrestore(
536 &cmd
->t_state_lock
, flags
);
538 cmd
->se_tfo
->check_stop_free(cmd
);
542 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
546 cmd
->t_state
= t_state
;
547 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
552 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
554 return transport_cmd_check_stop(cmd
, 2, 0);
557 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
559 struct se_lun
*lun
= cmd
->se_lun
;
565 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
566 if (!atomic_read(&cmd
->transport_dev_active
)) {
567 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
570 atomic_set(&cmd
->transport_dev_active
, 0);
571 transport_all_task_dev_remove_state(cmd
);
572 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
576 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
577 if (atomic_read(&cmd
->transport_lun_active
)) {
578 list_del(&cmd
->se_lun_node
);
579 atomic_set(&cmd
->transport_lun_active
, 0);
581 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
582 cmd
->se_tfo
->get_task_tag(cmd
), lun
->unpacked_lun
);
585 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
588 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
590 if (!cmd
->se_tmr_req
)
591 transport_lun_remove_cmd(cmd
);
593 if (transport_cmd_check_stop_to_fabric(cmd
))
596 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
597 transport_put_cmd(cmd
);
601 static void transport_add_cmd_to_queue(
605 struct se_device
*dev
= cmd
->se_dev
;
606 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
610 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
611 cmd
->t_state
= t_state
;
612 atomic_set(&cmd
->t_transport_active
, 1);
613 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
616 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
618 /* If the cmd is already on the list, remove it before we add it */
619 if (!list_empty(&cmd
->se_queue_node
))
620 list_del(&cmd
->se_queue_node
);
622 atomic_inc(&qobj
->queue_cnt
);
624 if (cmd
->se_cmd_flags
& SCF_EMULATE_QUEUE_FULL
) {
625 cmd
->se_cmd_flags
&= ~SCF_EMULATE_QUEUE_FULL
;
626 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
628 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
629 atomic_set(&cmd
->t_transport_queue_active
, 1);
630 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
632 wake_up_interruptible(&qobj
->thread_wq
);
635 static struct se_cmd
*
636 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
641 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
642 if (list_empty(&qobj
->qobj_list
)) {
643 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
646 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
648 atomic_set(&cmd
->t_transport_queue_active
, 0);
650 list_del_init(&cmd
->se_queue_node
);
651 atomic_dec(&qobj
->queue_cnt
);
652 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
657 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
658 struct se_queue_obj
*qobj
)
662 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
663 if (!atomic_read(&cmd
->t_transport_queue_active
)) {
664 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
667 atomic_set(&cmd
->t_transport_queue_active
, 0);
668 atomic_dec(&qobj
->queue_cnt
);
669 list_del_init(&cmd
->se_queue_node
);
670 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
672 if (atomic_read(&cmd
->t_transport_queue_active
)) {
673 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
674 cmd
->se_tfo
->get_task_tag(cmd
),
675 atomic_read(&cmd
->t_transport_queue_active
));
680 * Completion function used by TCM subsystem plugins (such as FILEIO)
681 * for queueing up response from struct se_subsystem_api->do_task()
683 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
685 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
686 struct se_task
, t_list
);
689 cmd
->scsi_status
= SAM_STAT_GOOD
;
690 task
->task_scsi_status
= GOOD
;
692 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
693 task
->task_error_status
= PYX_TRANSPORT_ILLEGAL_REQUEST
;
694 task
->task_se_cmd
->transport_error_status
=
695 PYX_TRANSPORT_ILLEGAL_REQUEST
;
698 transport_complete_task(task
, good
);
700 EXPORT_SYMBOL(transport_complete_sync_cache
);
702 /* transport_complete_task():
704 * Called from interrupt and non interrupt context depending
705 * on the transport plugin.
707 void transport_complete_task(struct se_task
*task
, int success
)
709 struct se_cmd
*cmd
= task
->task_se_cmd
;
710 struct se_device
*dev
= cmd
->se_dev
;
714 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
715 cmd
->t_task_cdb
[0], dev
);
718 atomic_inc(&dev
->depth_left
);
720 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
721 task
->task_flags
&= ~TF_ACTIVE
;
724 * See if any sense data exists, if so set the TASK_SENSE flag.
725 * Also check for any other post completion work that needs to be
726 * done by the plugins.
728 if (dev
&& dev
->transport
->transport_complete
) {
729 if (dev
->transport
->transport_complete(task
) != 0) {
730 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
731 task
->task_sense
= 1;
737 * See if we are waiting for outstanding struct se_task
738 * to complete for an exception condition
740 if (task
->task_flags
& TF_REQUEST_STOP
) {
742 * Decrement cmd->t_se_count if this task had
743 * previously thrown its timeout exception handler.
745 if (task
->task_flags
& TF_TIMEOUT
) {
746 atomic_dec(&cmd
->t_se_count
);
747 task
->task_flags
&= ~TF_TIMEOUT
;
749 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
751 complete(&task
->task_stop_comp
);
755 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
756 * left counter to determine when the struct se_cmd is ready to be queued to
757 * the processing thread.
759 if (task
->task_flags
& TF_TIMEOUT
) {
760 if (!atomic_dec_and_test(
761 &cmd
->t_task_cdbs_timeout_left
)) {
762 spin_unlock_irqrestore(&cmd
->t_state_lock
,
766 t_state
= TRANSPORT_COMPLETE_TIMEOUT
;
767 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
769 transport_add_cmd_to_queue(cmd
, t_state
);
772 atomic_dec(&cmd
->t_task_cdbs_timeout_left
);
775 * Decrement the outstanding t_task_cdbs_left count. The last
776 * struct se_task from struct se_cmd will complete itself into the
777 * device queue depending upon int success.
779 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
781 cmd
->t_tasks_failed
= 1;
783 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
787 if (!success
|| cmd
->t_tasks_failed
) {
788 t_state
= TRANSPORT_COMPLETE_FAILURE
;
789 if (!task
->task_error_status
) {
790 task
->task_error_status
=
791 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
792 cmd
->transport_error_status
=
793 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
796 atomic_set(&cmd
->t_transport_complete
, 1);
797 t_state
= TRANSPORT_COMPLETE_OK
;
799 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
801 transport_add_cmd_to_queue(cmd
, t_state
);
803 EXPORT_SYMBOL(transport_complete_task
);
806 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
807 * struct se_task list are ready to be added to the active execution list
810 * Called with se_dev_t->execute_task_lock called.
812 static inline int transport_add_task_check_sam_attr(
813 struct se_task
*task
,
814 struct se_task
*task_prev
,
815 struct se_device
*dev
)
818 * No SAM Task attribute emulation enabled, add to tail of
821 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
822 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
826 * HEAD_OF_QUEUE attribute for received CDB, which means
827 * the first task that is associated with a struct se_cmd goes to
828 * head of the struct se_device->execute_task_list, and task_prev
829 * after that for each subsequent task
831 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
832 list_add(&task
->t_execute_list
,
833 (task_prev
!= NULL
) ?
834 &task_prev
->t_execute_list
:
835 &dev
->execute_task_list
);
837 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
838 " in execution queue\n",
839 task
->task_se_cmd
->t_task_cdb
[0]);
843 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
844 * transitioned from Dermant -> Active state, and are added to the end
845 * of the struct se_device->execute_task_list
847 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
851 /* __transport_add_task_to_execute_queue():
853 * Called with se_dev_t->execute_task_lock called.
855 static void __transport_add_task_to_execute_queue(
856 struct se_task
*task
,
857 struct se_task
*task_prev
,
858 struct se_device
*dev
)
862 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
863 atomic_inc(&dev
->execute_tasks
);
865 if (atomic_read(&task
->task_state_active
))
868 * Determine if this task needs to go to HEAD_OF_QUEUE for the
869 * state list as well. Running with SAM Task Attribute emulation
870 * will always return head_of_queue == 0 here
873 list_add(&task
->t_state_list
, (task_prev
) ?
874 &task_prev
->t_state_list
:
875 &dev
->state_task_list
);
877 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
879 atomic_set(&task
->task_state_active
, 1);
881 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
882 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
886 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
888 struct se_device
*dev
= cmd
->se_dev
;
889 struct se_task
*task
;
892 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
893 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
894 if (atomic_read(&task
->task_state_active
))
897 spin_lock(&dev
->execute_task_lock
);
898 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
899 atomic_set(&task
->task_state_active
, 1);
901 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
902 task
->task_se_cmd
->se_tfo
->get_task_tag(
903 task
->task_se_cmd
), task
, dev
);
905 spin_unlock(&dev
->execute_task_lock
);
907 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
910 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
912 struct se_device
*dev
= cmd
->se_dev
;
913 struct se_task
*task
, *task_prev
= NULL
;
916 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
917 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
918 if (!list_empty(&task
->t_execute_list
))
921 * __transport_add_task_to_execute_queue() handles the
922 * SAM Task Attribute emulation if enabled
924 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
927 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
930 void __transport_remove_task_from_execute_queue(struct se_task
*task
,
931 struct se_device
*dev
)
933 list_del_init(&task
->t_execute_list
);
934 atomic_dec(&dev
->execute_tasks
);
937 void transport_remove_task_from_execute_queue(
938 struct se_task
*task
,
939 struct se_device
*dev
)
943 if (WARN_ON(list_empty(&task
->t_execute_list
)))
946 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
947 __transport_remove_task_from_execute_queue(task
, dev
);
948 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
952 * Handle QUEUE_FULL / -EAGAIN status
955 static void target_qf_do_work(struct work_struct
*work
)
957 struct se_device
*dev
= container_of(work
, struct se_device
,
959 LIST_HEAD(qf_cmd_list
);
960 struct se_cmd
*cmd
, *cmd_tmp
;
962 spin_lock_irq(&dev
->qf_cmd_lock
);
963 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
964 spin_unlock_irq(&dev
->qf_cmd_lock
);
966 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
967 list_del(&cmd
->se_qf_node
);
968 atomic_dec(&dev
->dev_qf_count
);
969 smp_mb__after_atomic_dec();
971 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
972 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
973 (cmd
->t_state
== TRANSPORT_COMPLETE_OK
) ? "COMPLETE_OK" :
974 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
977 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
978 * has been added to head of queue
980 transport_add_cmd_to_queue(cmd
, cmd
->t_state
);
984 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
986 switch (cmd
->data_direction
) {
989 case DMA_FROM_DEVICE
:
993 case DMA_BIDIRECTIONAL
:
1002 void transport_dump_dev_state(
1003 struct se_device
*dev
,
1007 *bl
+= sprintf(b
+ *bl
, "Status: ");
1008 switch (dev
->dev_status
) {
1009 case TRANSPORT_DEVICE_ACTIVATED
:
1010 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1012 case TRANSPORT_DEVICE_DEACTIVATED
:
1013 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1015 case TRANSPORT_DEVICE_SHUTDOWN
:
1016 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1018 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1019 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1020 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1023 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1027 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1028 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1030 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1031 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
1032 *bl
+= sprintf(b
+ *bl
, " ");
1035 void transport_dump_vpd_proto_id(
1036 struct t10_vpd
*vpd
,
1037 unsigned char *p_buf
,
1040 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1043 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1044 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1046 switch (vpd
->protocol_identifier
) {
1048 sprintf(buf
+len
, "Fibre Channel\n");
1051 sprintf(buf
+len
, "Parallel SCSI\n");
1054 sprintf(buf
+len
, "SSA\n");
1057 sprintf(buf
+len
, "IEEE 1394\n");
1060 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1064 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1067 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1070 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1074 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1077 sprintf(buf
+len
, "Unknown 0x%02x\n",
1078 vpd
->protocol_identifier
);
1083 strncpy(p_buf
, buf
, p_buf_len
);
1085 pr_debug("%s", buf
);
1089 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1092 * Check if the Protocol Identifier Valid (PIV) bit is set..
1094 * from spc3r23.pdf section 7.5.1
1096 if (page_83
[1] & 0x80) {
1097 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1098 vpd
->protocol_identifier_set
= 1;
1099 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1102 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1104 int transport_dump_vpd_assoc(
1105 struct t10_vpd
*vpd
,
1106 unsigned char *p_buf
,
1109 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1113 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1114 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1116 switch (vpd
->association
) {
1118 sprintf(buf
+len
, "addressed logical unit\n");
1121 sprintf(buf
+len
, "target port\n");
1124 sprintf(buf
+len
, "SCSI target device\n");
1127 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1133 strncpy(p_buf
, buf
, p_buf_len
);
1135 pr_debug("%s", buf
);
1140 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1143 * The VPD identification association..
1145 * from spc3r23.pdf Section 7.6.3.1 Table 297
1147 vpd
->association
= (page_83
[1] & 0x30);
1148 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1150 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1152 int transport_dump_vpd_ident_type(
1153 struct t10_vpd
*vpd
,
1154 unsigned char *p_buf
,
1157 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1161 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1162 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1164 switch (vpd
->device_identifier_type
) {
1166 sprintf(buf
+len
, "Vendor specific\n");
1169 sprintf(buf
+len
, "T10 Vendor ID based\n");
1172 sprintf(buf
+len
, "EUI-64 based\n");
1175 sprintf(buf
+len
, "NAA\n");
1178 sprintf(buf
+len
, "Relative target port identifier\n");
1181 sprintf(buf
+len
, "SCSI name string\n");
1184 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1185 vpd
->device_identifier_type
);
1191 if (p_buf_len
< strlen(buf
)+1)
1193 strncpy(p_buf
, buf
, p_buf_len
);
1195 pr_debug("%s", buf
);
1201 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1204 * The VPD identifier type..
1206 * from spc3r23.pdf Section 7.6.3.1 Table 298
1208 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1209 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1211 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1213 int transport_dump_vpd_ident(
1214 struct t10_vpd
*vpd
,
1215 unsigned char *p_buf
,
1218 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1221 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1223 switch (vpd
->device_identifier_code_set
) {
1224 case 0x01: /* Binary */
1225 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1226 &vpd
->device_identifier
[0]);
1228 case 0x02: /* ASCII */
1229 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1230 &vpd
->device_identifier
[0]);
1232 case 0x03: /* UTF-8 */
1233 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1234 &vpd
->device_identifier
[0]);
1237 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1238 " 0x%02x", vpd
->device_identifier_code_set
);
1244 strncpy(p_buf
, buf
, p_buf_len
);
1246 pr_debug("%s", buf
);
1252 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1254 static const char hex_str
[] = "0123456789abcdef";
1255 int j
= 0, i
= 4; /* offset to start of the identifer */
1258 * The VPD Code Set (encoding)
1260 * from spc3r23.pdf Section 7.6.3.1 Table 296
1262 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1263 switch (vpd
->device_identifier_code_set
) {
1264 case 0x01: /* Binary */
1265 vpd
->device_identifier
[j
++] =
1266 hex_str
[vpd
->device_identifier_type
];
1267 while (i
< (4 + page_83
[3])) {
1268 vpd
->device_identifier
[j
++] =
1269 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1270 vpd
->device_identifier
[j
++] =
1271 hex_str
[page_83
[i
] & 0x0f];
1275 case 0x02: /* ASCII */
1276 case 0x03: /* UTF-8 */
1277 while (i
< (4 + page_83
[3]))
1278 vpd
->device_identifier
[j
++] = page_83
[i
++];
1284 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1286 EXPORT_SYMBOL(transport_set_vpd_ident
);
1288 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1291 * If this device is from Target_Core_Mod/pSCSI, disable the
1292 * SAM Task Attribute emulation.
1294 * This is currently not available in upsream Linux/SCSI Target
1295 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1297 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1298 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1302 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1303 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1304 " device\n", dev
->transport
->name
,
1305 dev
->transport
->get_device_rev(dev
));
1308 static void scsi_dump_inquiry(struct se_device
*dev
)
1310 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1313 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1315 pr_debug(" Vendor: ");
1316 for (i
= 0; i
< 8; i
++)
1317 if (wwn
->vendor
[i
] >= 0x20)
1318 pr_debug("%c", wwn
->vendor
[i
]);
1322 pr_debug(" Model: ");
1323 for (i
= 0; i
< 16; i
++)
1324 if (wwn
->model
[i
] >= 0x20)
1325 pr_debug("%c", wwn
->model
[i
]);
1329 pr_debug(" Revision: ");
1330 for (i
= 0; i
< 4; i
++)
1331 if (wwn
->revision
[i
] >= 0x20)
1332 pr_debug("%c", wwn
->revision
[i
]);
1338 device_type
= dev
->transport
->get_device_type(dev
);
1339 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1340 pr_debug(" ANSI SCSI revision: %02x\n",
1341 dev
->transport
->get_device_rev(dev
));
1344 struct se_device
*transport_add_device_to_core_hba(
1346 struct se_subsystem_api
*transport
,
1347 struct se_subsystem_dev
*se_dev
,
1349 void *transport_dev
,
1350 struct se_dev_limits
*dev_limits
,
1351 const char *inquiry_prod
,
1352 const char *inquiry_rev
)
1355 struct se_device
*dev
;
1357 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1359 pr_err("Unable to allocate memory for se_dev_t\n");
1363 transport_init_queue_obj(&dev
->dev_queue_obj
);
1364 dev
->dev_flags
= device_flags
;
1365 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1366 dev
->dev_ptr
= transport_dev
;
1368 dev
->se_sub_dev
= se_dev
;
1369 dev
->transport
= transport
;
1370 atomic_set(&dev
->active_cmds
, 0);
1371 INIT_LIST_HEAD(&dev
->dev_list
);
1372 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1373 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1374 INIT_LIST_HEAD(&dev
->execute_task_list
);
1375 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1376 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1377 INIT_LIST_HEAD(&dev
->state_task_list
);
1378 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1379 spin_lock_init(&dev
->execute_task_lock
);
1380 spin_lock_init(&dev
->delayed_cmd_lock
);
1381 spin_lock_init(&dev
->ordered_cmd_lock
);
1382 spin_lock_init(&dev
->state_task_lock
);
1383 spin_lock_init(&dev
->dev_alua_lock
);
1384 spin_lock_init(&dev
->dev_reservation_lock
);
1385 spin_lock_init(&dev
->dev_status_lock
);
1386 spin_lock_init(&dev
->dev_status_thr_lock
);
1387 spin_lock_init(&dev
->se_port_lock
);
1388 spin_lock_init(&dev
->se_tmr_lock
);
1389 spin_lock_init(&dev
->qf_cmd_lock
);
1391 dev
->queue_depth
= dev_limits
->queue_depth
;
1392 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1393 atomic_set(&dev
->dev_ordered_id
, 0);
1395 se_dev_set_default_attribs(dev
, dev_limits
);
1397 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1398 dev
->creation_time
= get_jiffies_64();
1399 spin_lock_init(&dev
->stats_lock
);
1401 spin_lock(&hba
->device_lock
);
1402 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1404 spin_unlock(&hba
->device_lock
);
1406 * Setup the SAM Task Attribute emulation for struct se_device
1408 core_setup_task_attr_emulation(dev
);
1410 * Force PR and ALUA passthrough emulation with internal object use.
1412 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1414 * Setup the Reservations infrastructure for struct se_device
1416 core_setup_reservations(dev
, force_pt
);
1418 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1420 if (core_setup_alua(dev
, force_pt
) < 0)
1424 * Startup the struct se_device processing thread
1426 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1427 "LIO_%s", dev
->transport
->name
);
1428 if (IS_ERR(dev
->process_thread
)) {
1429 pr_err("Unable to create kthread: LIO_%s\n",
1430 dev
->transport
->name
);
1434 * Setup work_queue for QUEUE_FULL
1436 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1438 * Preload the initial INQUIRY const values if we are doing
1439 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1440 * passthrough because this is being provided by the backend LLD.
1441 * This is required so that transport_get_inquiry() copies these
1442 * originals once back into DEV_T10_WWN(dev) for the virtual device
1445 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1446 if (!inquiry_prod
|| !inquiry_rev
) {
1447 pr_err("All non TCM/pSCSI plugins require"
1448 " INQUIRY consts\n");
1452 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1453 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1454 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1456 scsi_dump_inquiry(dev
);
1460 kthread_stop(dev
->process_thread
);
1462 spin_lock(&hba
->device_lock
);
1463 list_del(&dev
->dev_list
);
1465 spin_unlock(&hba
->device_lock
);
1467 se_release_vpd_for_dev(dev
);
1473 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1475 /* transport_generic_prepare_cdb():
1477 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1478 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1479 * The point of this is since we are mapping iSCSI LUNs to
1480 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1481 * devices and HBAs for a loop.
1483 static inline void transport_generic_prepare_cdb(
1487 case READ_10
: /* SBC - RDProtect */
1488 case READ_12
: /* SBC - RDProtect */
1489 case READ_16
: /* SBC - RDProtect */
1490 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1491 case VERIFY
: /* SBC - VRProtect */
1492 case VERIFY_16
: /* SBC - VRProtect */
1493 case WRITE_VERIFY
: /* SBC - VRProtect */
1494 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1497 cdb
[1] &= 0x1f; /* clear logical unit number */
1502 static struct se_task
*
1503 transport_generic_get_task(struct se_cmd
*cmd
,
1504 enum dma_data_direction data_direction
)
1506 struct se_task
*task
;
1507 struct se_device
*dev
= cmd
->se_dev
;
1509 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1511 pr_err("Unable to allocate struct se_task\n");
1515 INIT_LIST_HEAD(&task
->t_list
);
1516 INIT_LIST_HEAD(&task
->t_execute_list
);
1517 INIT_LIST_HEAD(&task
->t_state_list
);
1518 init_completion(&task
->task_stop_comp
);
1519 task
->task_se_cmd
= cmd
;
1520 task
->task_data_direction
= data_direction
;
1525 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1528 * Used by fabric modules containing a local struct se_cmd within their
1529 * fabric dependent per I/O descriptor.
1531 void transport_init_se_cmd(
1533 struct target_core_fabric_ops
*tfo
,
1534 struct se_session
*se_sess
,
1538 unsigned char *sense_buffer
)
1540 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1541 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1542 INIT_LIST_HEAD(&cmd
->se_ordered_node
);
1543 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1544 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1546 INIT_LIST_HEAD(&cmd
->t_task_list
);
1547 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1548 init_completion(&cmd
->transport_lun_stop_comp
);
1549 init_completion(&cmd
->t_transport_stop_comp
);
1550 spin_lock_init(&cmd
->t_state_lock
);
1551 atomic_set(&cmd
->transport_dev_active
, 1);
1554 cmd
->se_sess
= se_sess
;
1555 cmd
->data_length
= data_length
;
1556 cmd
->data_direction
= data_direction
;
1557 cmd
->sam_task_attr
= task_attr
;
1558 cmd
->sense_buffer
= sense_buffer
;
1560 EXPORT_SYMBOL(transport_init_se_cmd
);
1562 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1565 * Check if SAM Task Attribute emulation is enabled for this
1566 * struct se_device storage object
1568 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1571 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1572 pr_debug("SAM Task Attribute ACA"
1573 " emulation is not supported\n");
1577 * Used to determine when ORDERED commands should go from
1578 * Dormant to Active status.
1580 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1581 smp_mb__after_atomic_inc();
1582 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1583 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1584 cmd
->se_dev
->transport
->name
);
1588 /* transport_generic_allocate_tasks():
1590 * Called from fabric RX Thread.
1592 int transport_generic_allocate_tasks(
1598 transport_generic_prepare_cdb(cdb
);
1600 * Ensure that the received CDB is less than the max (252 + 8) bytes
1601 * for VARIABLE_LENGTH_CMD
1603 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1604 pr_err("Received SCSI CDB with command_size: %d that"
1605 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1606 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1610 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1611 * allocate the additional extended CDB buffer now.. Otherwise
1612 * setup the pointer from __t_task_cdb to t_task_cdb.
1614 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1615 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1617 if (!cmd
->t_task_cdb
) {
1618 pr_err("Unable to allocate cmd->t_task_cdb"
1619 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1620 scsi_command_size(cdb
),
1621 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1625 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1627 * Copy the original CDB into cmd->
1629 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1631 * Setup the received CDB based on SCSI defined opcodes and
1632 * perform unit attention, persistent reservations and ALUA
1633 * checks for virtual device backends. The cmd->t_task_cdb
1634 * pointer is expected to be setup before we reach this point.
1636 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1640 * Check for SAM Task Attribute Emulation
1642 if (transport_check_alloc_task_attr(cmd
) < 0) {
1643 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1644 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1647 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1648 if (cmd
->se_lun
->lun_sep
)
1649 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1650 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1653 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1655 static void transport_generic_request_failure(struct se_cmd
*,
1656 struct se_device
*, int, int);
1658 * Used by fabric module frontends to queue tasks directly.
1659 * Many only be used from process context only
1661 int transport_handle_cdb_direct(
1668 pr_err("cmd->se_lun is NULL\n");
1671 if (in_interrupt()) {
1673 pr_err("transport_generic_handle_cdb cannot be called"
1674 " from interrupt context\n");
1678 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1679 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1680 * in existing usage to ensure that outstanding descriptors are handled
1681 * correctly during shutdown via transport_wait_for_tasks()
1683 * Also, we don't take cmd->t_state_lock here as we only expect
1684 * this to be called for initial descriptor submission.
1686 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1687 atomic_set(&cmd
->t_transport_active
, 1);
1689 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1690 * so follow TRANSPORT_NEW_CMD processing thread context usage
1691 * and call transport_generic_request_failure() if necessary..
1693 ret
= transport_generic_new_cmd(cmd
);
1697 cmd
->transport_error_status
= ret
;
1698 transport_generic_request_failure(cmd
, NULL
, 0,
1699 (cmd
->data_direction
!= DMA_TO_DEVICE
));
1703 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1706 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1707 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1708 * complete setup in TCM process context w/ TFO->new_cmd_map().
1710 int transport_generic_handle_cdb_map(
1715 pr_err("cmd->se_lun is NULL\n");
1719 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
);
1722 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1724 /* transport_generic_handle_data():
1728 int transport_generic_handle_data(
1732 * For the software fabric case, then we assume the nexus is being
1733 * failed/shutdown when signals are pending from the kthread context
1734 * caller, so we return a failure. For the HW target mode case running
1735 * in interrupt code, the signal_pending() check is skipped.
1737 if (!in_interrupt() && signal_pending(current
))
1740 * If the received CDB has aleady been ABORTED by the generic
1741 * target engine, we now call transport_check_aborted_status()
1742 * to queue any delated TASK_ABORTED status for the received CDB to the
1743 * fabric module as we are expecting no further incoming DATA OUT
1744 * sequences at this point.
1746 if (transport_check_aborted_status(cmd
, 1) != 0)
1749 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
);
1752 EXPORT_SYMBOL(transport_generic_handle_data
);
1754 /* transport_generic_handle_tmr():
1758 int transport_generic_handle_tmr(
1761 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
);
1764 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1766 void transport_generic_free_cmd_intr(
1769 transport_add_cmd_to_queue(cmd
, TRANSPORT_FREE_CMD_INTR
);
1771 EXPORT_SYMBOL(transport_generic_free_cmd_intr
);
1773 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1775 struct se_task
*task
, *task_tmp
;
1776 unsigned long flags
;
1779 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1780 cmd
->se_tfo
->get_task_tag(cmd
));
1783 * No tasks remain in the execution queue
1785 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1786 list_for_each_entry_safe(task
, task_tmp
,
1787 &cmd
->t_task_list
, t_list
) {
1788 pr_debug("Processing task %p\n", task
);
1790 * If the struct se_task has not been sent and is not active,
1791 * remove the struct se_task from the execution queue.
1793 if (!(task
->task_flags
& (TF_ACTIVE
| TF_SENT
))) {
1794 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1796 transport_remove_task_from_execute_queue(task
,
1799 pr_debug("Task %p removed from execute queue\n", task
);
1800 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1805 * If the struct se_task is active, sleep until it is returned
1808 if (task
->task_flags
& TF_ACTIVE
) {
1809 task
->task_flags
|= TF_REQUEST_STOP
;
1810 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1813 pr_debug("Task %p waiting to complete\n", task
);
1814 wait_for_completion(&task
->task_stop_comp
);
1815 pr_debug("Task %p stopped successfully\n", task
);
1817 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1818 atomic_dec(&cmd
->t_task_cdbs_left
);
1819 task
->task_flags
&= ~(TF_ACTIVE
| TF_REQUEST_STOP
);
1821 pr_debug("Task %p - did nothing\n", task
);
1825 __transport_stop_task_timer(task
, &flags
);
1827 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1833 * Handle SAM-esque emulation for generic transport request failures.
1835 static void transport_generic_request_failure(
1837 struct se_device
*dev
,
1843 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1844 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1845 cmd
->t_task_cdb
[0]);
1846 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1847 " %d/%d transport_error_status: %d\n",
1848 cmd
->se_tfo
->get_cmd_state(cmd
),
1849 cmd
->t_state
, cmd
->deferred_t_state
,
1850 cmd
->transport_error_status
);
1851 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1852 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1853 " t_transport_active: %d t_transport_stop: %d"
1854 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1855 atomic_read(&cmd
->t_task_cdbs_left
),
1856 atomic_read(&cmd
->t_task_cdbs_sent
),
1857 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1858 atomic_read(&cmd
->t_transport_active
),
1859 atomic_read(&cmd
->t_transport_stop
),
1860 atomic_read(&cmd
->t_transport_sent
));
1862 transport_stop_all_task_timers(cmd
);
1865 atomic_inc(&dev
->depth_left
);
1867 * For SAM Task Attribute emulation for failed struct se_cmd
1869 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1870 transport_complete_task_attr(cmd
);
1873 transport_direct_request_timeout(cmd
);
1874 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
1877 switch (cmd
->transport_error_status
) {
1878 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
1879 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1881 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
1882 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
1884 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
1885 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1887 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
1888 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
1890 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
1892 transport_new_cmd_failure(cmd
);
1894 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1895 * we force this session to fall back to session
1898 cmd
->se_tfo
->fall_back_to_erl0(cmd
->se_sess
);
1899 cmd
->se_tfo
->stop_session(cmd
->se_sess
, 0, 0);
1902 case PYX_TRANSPORT_LU_COMM_FAILURE
:
1903 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
1904 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1906 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
1907 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
1909 case PYX_TRANSPORT_WRITE_PROTECTED
:
1910 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
1912 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
1914 * No SENSE Data payload for this case, set SCSI Status
1915 * and queue the response to $FABRIC_MOD.
1917 * Uses linux/include/scsi/scsi.h SAM status codes defs
1919 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1921 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1922 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1925 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1928 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1929 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1930 cmd
->orig_fe_lun
, 0x2C,
1931 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1933 ret
= cmd
->se_tfo
->queue_status(cmd
);
1937 case PYX_TRANSPORT_USE_SENSE_REASON
:
1939 * struct se_cmd->scsi_sense_reason already set
1943 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1945 cmd
->transport_error_status
);
1946 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1950 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1951 * make the call to transport_send_check_condition_and_sense()
1952 * directly. Otherwise expect the fabric to make the call to
1953 * transport_send_check_condition_and_sense() after handling
1954 * possible unsoliticied write data payloads.
1956 if (!sc
&& !cmd
->se_tfo
->new_cmd_map
)
1957 transport_new_cmd_failure(cmd
);
1959 ret
= transport_send_check_condition_and_sense(cmd
,
1960 cmd
->scsi_sense_reason
, 0);
1966 transport_lun_remove_cmd(cmd
);
1967 if (!transport_cmd_check_stop_to_fabric(cmd
))
1972 cmd
->t_state
= TRANSPORT_COMPLETE_OK
;
1973 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
1976 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
1978 unsigned long flags
;
1980 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1981 if (!atomic_read(&cmd
->t_transport_timeout
)) {
1982 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1985 if (atomic_read(&cmd
->t_task_cdbs_timeout_left
)) {
1986 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1990 atomic_sub(atomic_read(&cmd
->t_transport_timeout
),
1992 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1995 static void transport_generic_request_timeout(struct se_cmd
*cmd
)
1997 unsigned long flags
;
2000 * Reset cmd->t_se_count to allow transport_put_cmd()
2001 * to allow last call to free memory resources.
2003 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2004 if (atomic_read(&cmd
->t_transport_timeout
) > 1) {
2005 int tmp
= (atomic_read(&cmd
->t_transport_timeout
) - 1);
2007 atomic_sub(tmp
, &cmd
->t_se_count
);
2009 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2011 transport_put_cmd(cmd
);
2014 static inline u32
transport_lba_21(unsigned char *cdb
)
2016 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2019 static inline u32
transport_lba_32(unsigned char *cdb
)
2021 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2024 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2026 unsigned int __v1
, __v2
;
2028 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2029 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2031 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2035 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2037 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2039 unsigned int __v1
, __v2
;
2041 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2042 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2044 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2047 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2049 unsigned long flags
;
2051 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2052 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2053 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2057 * Called from interrupt context.
2059 static void transport_task_timeout_handler(unsigned long data
)
2061 struct se_task
*task
= (struct se_task
*)data
;
2062 struct se_cmd
*cmd
= task
->task_se_cmd
;
2063 unsigned long flags
;
2065 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2067 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2068 if (task
->task_flags
& TF_TIMER_STOP
) {
2069 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2072 task
->task_flags
&= ~TF_TIMER_RUNNING
;
2075 * Determine if transport_complete_task() has already been called.
2077 if (!(task
->task_flags
& TF_ACTIVE
)) {
2078 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2080 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2084 atomic_inc(&cmd
->t_se_count
);
2085 atomic_inc(&cmd
->t_transport_timeout
);
2086 cmd
->t_tasks_failed
= 1;
2088 task
->task_flags
|= TF_TIMEOUT
;
2089 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2090 task
->task_scsi_status
= 1;
2092 if (task
->task_flags
& TF_REQUEST_STOP
) {
2093 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2094 " == 1\n", task
, cmd
);
2095 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2096 complete(&task
->task_stop_comp
);
2100 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
2101 pr_debug("transport task: %p cmd: %p timeout non zero"
2102 " t_task_cdbs_left\n", task
, cmd
);
2103 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2106 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2109 cmd
->t_state
= TRANSPORT_COMPLETE_FAILURE
;
2110 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2112 transport_add_cmd_to_queue(cmd
, TRANSPORT_COMPLETE_FAILURE
);
2116 * Called with cmd->t_state_lock held.
2118 static void transport_start_task_timer(struct se_task
*task
)
2120 struct se_device
*dev
= task
->task_se_cmd
->se_dev
;
2123 if (task
->task_flags
& TF_TIMER_RUNNING
)
2126 * If the task_timeout is disabled, exit now.
2128 timeout
= dev
->se_sub_dev
->se_dev_attrib
.task_timeout
;
2132 init_timer(&task
->task_timer
);
2133 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2134 task
->task_timer
.data
= (unsigned long) task
;
2135 task
->task_timer
.function
= transport_task_timeout_handler
;
2137 task
->task_flags
|= TF_TIMER_RUNNING
;
2138 add_timer(&task
->task_timer
);
2140 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2141 " %d\n", task
->task_se_cmd
, task
, timeout
);
2146 * Called with spin_lock_irq(&cmd->t_state_lock) held.
2148 void __transport_stop_task_timer(struct se_task
*task
, unsigned long *flags
)
2150 struct se_cmd
*cmd
= task
->task_se_cmd
;
2152 if (!(task
->task_flags
& TF_TIMER_RUNNING
))
2155 task
->task_flags
|= TF_TIMER_STOP
;
2156 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
2158 del_timer_sync(&task
->task_timer
);
2160 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
2161 task
->task_flags
&= ~TF_TIMER_RUNNING
;
2162 task
->task_flags
&= ~TF_TIMER_STOP
;
2165 static void transport_stop_all_task_timers(struct se_cmd
*cmd
)
2167 struct se_task
*task
= NULL
, *task_tmp
;
2168 unsigned long flags
;
2170 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2171 list_for_each_entry_safe(task
, task_tmp
,
2172 &cmd
->t_task_list
, t_list
)
2173 __transport_stop_task_timer(task
, &flags
);
2174 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2177 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2179 if (dev
->dev_tcq_window_closed
++ <
2180 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2181 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2183 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2185 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
2190 * Called from Fabric Module context from transport_execute_tasks()
2192 * The return of this function determins if the tasks from struct se_cmd
2193 * get added to the execution queue in transport_execute_tasks(),
2194 * or are added to the delayed or ordered lists here.
2196 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2198 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2201 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2202 * to allow the passed struct se_cmd list of tasks to the front of the list.
2204 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2205 atomic_inc(&cmd
->se_dev
->dev_hoq_count
);
2206 smp_mb__after_atomic_inc();
2207 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2208 " 0x%02x, se_ordered_id: %u\n",
2210 cmd
->se_ordered_id
);
2212 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2213 spin_lock(&cmd
->se_dev
->ordered_cmd_lock
);
2214 list_add_tail(&cmd
->se_ordered_node
,
2215 &cmd
->se_dev
->ordered_cmd_list
);
2216 spin_unlock(&cmd
->se_dev
->ordered_cmd_lock
);
2218 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2219 smp_mb__after_atomic_inc();
2221 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2222 " list, se_ordered_id: %u\n",
2224 cmd
->se_ordered_id
);
2226 * Add ORDERED command to tail of execution queue if
2227 * no other older commands exist that need to be
2230 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2234 * For SIMPLE and UNTAGGED Task Attribute commands
2236 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2237 smp_mb__after_atomic_inc();
2240 * Otherwise if one or more outstanding ORDERED task attribute exist,
2241 * add the dormant task(s) built for the passed struct se_cmd to the
2242 * execution queue and become in Active state for this struct se_device.
2244 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2246 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2247 * will be drained upon completion of HEAD_OF_QUEUE task.
2249 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2250 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2251 list_add_tail(&cmd
->se_delayed_node
,
2252 &cmd
->se_dev
->delayed_cmd_list
);
2253 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2255 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2256 " delayed CMD list, se_ordered_id: %u\n",
2257 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2258 cmd
->se_ordered_id
);
2260 * Return zero to let transport_execute_tasks() know
2261 * not to add the delayed tasks to the execution list.
2266 * Otherwise, no ORDERED task attributes exist..
2272 * Called from fabric module context in transport_generic_new_cmd() and
2273 * transport_generic_process_write()
2275 static int transport_execute_tasks(struct se_cmd
*cmd
)
2279 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2280 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2281 transport_generic_request_failure(cmd
, NULL
, 0, 1);
2286 * Call transport_cmd_check_stop() to see if a fabric exception
2287 * has occurred that prevents execution.
2289 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2291 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2292 * attribute for the tasks of the received struct se_cmd CDB
2294 add_tasks
= transport_execute_task_attr(cmd
);
2298 * This calls transport_add_tasks_from_cmd() to handle
2299 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2300 * (if enabled) in __transport_add_task_to_execute_queue() and
2301 * transport_add_task_check_sam_attr().
2303 transport_add_tasks_from_cmd(cmd
);
2306 * Kick the execution queue for the cmd associated struct se_device
2310 __transport_execute_tasks(cmd
->se_dev
);
2315 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2316 * from struct se_device->execute_task_list and
2318 * Called from transport_processing_thread()
2320 static int __transport_execute_tasks(struct se_device
*dev
)
2323 struct se_cmd
*cmd
= NULL
;
2324 struct se_task
*task
= NULL
;
2325 unsigned long flags
;
2328 * Check if there is enough room in the device and HBA queue to send
2329 * struct se_tasks to the selected transport.
2332 if (!atomic_read(&dev
->depth_left
))
2333 return transport_tcq_window_closed(dev
);
2335 dev
->dev_tcq_window_closed
= 0;
2337 spin_lock_irq(&dev
->execute_task_lock
);
2338 if (list_empty(&dev
->execute_task_list
)) {
2339 spin_unlock_irq(&dev
->execute_task_lock
);
2342 task
= list_first_entry(&dev
->execute_task_list
,
2343 struct se_task
, t_execute_list
);
2344 __transport_remove_task_from_execute_queue(task
, dev
);
2345 spin_unlock_irq(&dev
->execute_task_lock
);
2347 atomic_dec(&dev
->depth_left
);
2349 cmd
= task
->task_se_cmd
;
2351 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2352 task
->task_flags
|= (TF_ACTIVE
| TF_SENT
);
2353 atomic_inc(&cmd
->t_task_cdbs_sent
);
2355 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2356 cmd
->t_task_list_num
)
2357 atomic_set(&cmd
->transport_sent
, 1);
2359 transport_start_task_timer(task
);
2360 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2362 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2363 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2364 * struct se_subsystem_api->do_task() caller below.
2366 if (cmd
->transport_emulate_cdb
) {
2367 error
= cmd
->transport_emulate_cdb(cmd
);
2369 cmd
->transport_error_status
= error
;
2370 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2371 task
->task_flags
&= ~TF_ACTIVE
;
2372 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2373 atomic_set(&cmd
->transport_sent
, 0);
2374 transport_stop_tasks_for_cmd(cmd
);
2375 transport_generic_request_failure(cmd
, dev
, 0, 1);
2379 * Handle the successful completion for transport_emulate_cdb()
2380 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2381 * Otherwise the caller is expected to complete the task with
2384 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2385 cmd
->scsi_status
= SAM_STAT_GOOD
;
2386 task
->task_scsi_status
= GOOD
;
2387 transport_complete_task(task
, 1);
2391 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2392 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2393 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2394 * LUN emulation code.
2396 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2397 * call ->do_task() directly and let the underlying TCM subsystem plugin
2398 * code handle the CDB emulation.
2400 if ((dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2401 (!(task
->task_se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2402 error
= transport_emulate_control_cdb(task
);
2404 error
= dev
->transport
->do_task(task
);
2407 cmd
->transport_error_status
= error
;
2408 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2409 task
->task_flags
&= ~TF_ACTIVE
;
2410 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2411 atomic_set(&cmd
->transport_sent
, 0);
2412 transport_stop_tasks_for_cmd(cmd
);
2413 transport_generic_request_failure(cmd
, dev
, 0, 1);
2422 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2424 unsigned long flags
;
2426 * Any unsolicited data will get dumped for failed command inside of
2429 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2430 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2431 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2432 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2435 static inline u32
transport_get_sectors_6(
2440 struct se_device
*dev
= cmd
->se_dev
;
2443 * Assume TYPE_DISK for non struct se_device objects.
2444 * Use 8-bit sector value.
2450 * Use 24-bit allocation length for TYPE_TAPE.
2452 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2453 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2456 * Everything else assume TYPE_DISK Sector CDB location.
2457 * Use 8-bit sector value.
2463 static inline u32
transport_get_sectors_10(
2468 struct se_device
*dev
= cmd
->se_dev
;
2471 * Assume TYPE_DISK for non struct se_device objects.
2472 * Use 16-bit sector value.
2478 * XXX_10 is not defined in SSC, throw an exception
2480 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2486 * Everything else assume TYPE_DISK Sector CDB location.
2487 * Use 16-bit sector value.
2490 return (u32
)(cdb
[7] << 8) + cdb
[8];
2493 static inline u32
transport_get_sectors_12(
2498 struct se_device
*dev
= cmd
->se_dev
;
2501 * Assume TYPE_DISK for non struct se_device objects.
2502 * Use 32-bit sector value.
2508 * XXX_12 is not defined in SSC, throw an exception
2510 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2516 * Everything else assume TYPE_DISK Sector CDB location.
2517 * Use 32-bit sector value.
2520 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2523 static inline u32
transport_get_sectors_16(
2528 struct se_device
*dev
= cmd
->se_dev
;
2531 * Assume TYPE_DISK for non struct se_device objects.
2532 * Use 32-bit sector value.
2538 * Use 24-bit allocation length for TYPE_TAPE.
2540 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2541 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2544 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2545 (cdb
[12] << 8) + cdb
[13];
2549 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2551 static inline u32
transport_get_sectors_32(
2557 * Assume TYPE_DISK for non struct se_device objects.
2558 * Use 32-bit sector value.
2560 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2561 (cdb
[30] << 8) + cdb
[31];
2565 static inline u32
transport_get_size(
2570 struct se_device
*dev
= cmd
->se_dev
;
2572 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2573 if (cdb
[1] & 1) { /* sectors */
2574 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2579 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2580 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2581 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2582 dev
->transport
->name
);
2584 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2587 static void transport_xor_callback(struct se_cmd
*cmd
)
2589 unsigned char *buf
, *addr
;
2590 struct scatterlist
*sg
;
2591 unsigned int offset
;
2595 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2597 * 1) read the specified logical block(s);
2598 * 2) transfer logical blocks from the data-out buffer;
2599 * 3) XOR the logical blocks transferred from the data-out buffer with
2600 * the logical blocks read, storing the resulting XOR data in a buffer;
2601 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2602 * blocks transferred from the data-out buffer; and
2603 * 5) transfer the resulting XOR data to the data-in buffer.
2605 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2607 pr_err("Unable to allocate xor_callback buf\n");
2611 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2612 * into the locally allocated *buf
2614 sg_copy_to_buffer(cmd
->t_data_sg
,
2620 * Now perform the XOR against the BIDI read memory located at
2621 * cmd->t_mem_bidi_list
2625 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2626 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2630 for (i
= 0; i
< sg
->length
; i
++)
2631 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2633 offset
+= sg
->length
;
2634 kunmap_atomic(addr
, KM_USER0
);
2642 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2644 static int transport_get_sense_data(struct se_cmd
*cmd
)
2646 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2647 struct se_device
*dev
= cmd
->se_dev
;
2648 struct se_task
*task
= NULL
, *task_tmp
;
2649 unsigned long flags
;
2652 WARN_ON(!cmd
->se_lun
);
2657 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2658 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2659 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2663 list_for_each_entry_safe(task
, task_tmp
,
2664 &cmd
->t_task_list
, t_list
) {
2665 if (!task
->task_sense
)
2668 if (!dev
->transport
->get_sense_buffer
) {
2669 pr_err("dev->transport->get_sense_buffer"
2674 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2675 if (!sense_buffer
) {
2676 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2677 " sense buffer for task with sense\n",
2678 cmd
->se_tfo
->get_task_tag(cmd
), task
);
2681 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2683 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2684 TRANSPORT_SENSE_BUFFER
);
2686 memcpy(&buffer
[offset
], sense_buffer
,
2687 TRANSPORT_SENSE_BUFFER
);
2688 cmd
->scsi_status
= task
->task_scsi_status
;
2689 /* Automatically padded */
2690 cmd
->scsi_sense_length
=
2691 (TRANSPORT_SENSE_BUFFER
+ offset
);
2693 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2695 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2699 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2705 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
2707 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2708 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2709 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2711 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2712 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2715 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2718 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2719 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2720 cmd
->orig_fe_lun
, 0x2C,
2721 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2725 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2727 return dev
->transport
->get_blocks(dev
) + 1;
2730 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2732 struct se_device
*dev
= cmd
->se_dev
;
2735 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2738 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2740 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2741 pr_err("LBA: %llu Sectors: %u exceeds"
2742 " transport_dev_end_lba(): %llu\n",
2743 cmd
->t_task_lba
, sectors
,
2744 transport_dev_end_lba(dev
));
2751 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2754 * Determine if the received WRITE_SAME is used to for direct
2755 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2756 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2757 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2759 int passthrough
= (dev
->transport
->transport_type
==
2760 TRANSPORT_PLUGIN_PHBA_PDEV
);
2763 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2764 pr_err("WRITE_SAME PBDATA and LBDATA"
2765 " bits not supported for Block Discard"
2770 * Currently for the emulated case we only accept
2771 * tpws with the UNMAP=1 bit set.
2773 if (!(flags
[0] & 0x08)) {
2774 pr_err("WRITE_SAME w/o UNMAP bit not"
2775 " supported for Block Discard Emulation\n");
2783 /* transport_generic_cmd_sequencer():
2785 * Generic Command Sequencer that should work for most DAS transport
2788 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2791 * FIXME: Need to support other SCSI OPCODES where as well.
2793 static int transport_generic_cmd_sequencer(
2797 struct se_device
*dev
= cmd
->se_dev
;
2798 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2799 int ret
= 0, sector_ret
= 0, passthrough
;
2800 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2804 * Check for an existing UNIT ATTENTION condition
2806 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2807 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2808 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2812 * Check status of Asymmetric Logical Unit Assignment port
2814 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2817 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2818 * The ALUA additional sense code qualifier (ASCQ) is determined
2819 * by the ALUA primary or secondary access state..
2823 pr_debug("[%s]: ALUA TG Port not available,"
2824 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2825 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2827 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2828 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2829 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2832 goto out_invalid_cdb_field
;
2835 * Check status for SPC-3 Persistent Reservations
2837 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2838 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2839 cmd
, cdb
, pr_reg_type
) != 0)
2840 return transport_handle_reservation_conflict(cmd
);
2842 * This means the CDB is allowed for the SCSI Initiator port
2843 * when said port is *NOT* holding the legacy SPC-2 or
2844 * SPC-3 Persistent Reservation.
2850 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2852 goto out_unsupported_cdb
;
2853 size
= transport_get_size(sectors
, cdb
, cmd
);
2854 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
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
->transport_split_cdb
= &split_cdb_XX_10
;
2864 cmd
->t_task_lba
= transport_lba_32(cdb
);
2865 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2868 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2870 goto out_unsupported_cdb
;
2871 size
= transport_get_size(sectors
, cdb
, cmd
);
2872 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
2873 cmd
->t_task_lba
= transport_lba_32(cdb
);
2874 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2877 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2879 goto out_unsupported_cdb
;
2880 size
= transport_get_size(sectors
, cdb
, cmd
);
2881 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
2882 cmd
->t_task_lba
= transport_lba_64(cdb
);
2883 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2886 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2888 goto out_unsupported_cdb
;
2889 size
= transport_get_size(sectors
, cdb
, cmd
);
2890 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
2891 cmd
->t_task_lba
= transport_lba_21(cdb
);
2892 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2895 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2897 goto out_unsupported_cdb
;
2898 size
= transport_get_size(sectors
, cdb
, cmd
);
2899 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2900 cmd
->t_task_lba
= transport_lba_32(cdb
);
2901 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2902 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2905 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2907 goto out_unsupported_cdb
;
2908 size
= transport_get_size(sectors
, cdb
, cmd
);
2909 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
2910 cmd
->t_task_lba
= transport_lba_32(cdb
);
2911 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2912 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2915 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2917 goto out_unsupported_cdb
;
2918 size
= transport_get_size(sectors
, cdb
, cmd
);
2919 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
2920 cmd
->t_task_lba
= transport_lba_64(cdb
);
2921 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2922 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2924 case XDWRITEREAD_10
:
2925 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2926 !(cmd
->t_tasks_bidi
))
2927 goto out_invalid_cdb_field
;
2928 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2930 goto out_unsupported_cdb
;
2931 size
= transport_get_size(sectors
, cdb
, cmd
);
2932 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2933 cmd
->t_task_lba
= transport_lba_32(cdb
);
2934 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2935 passthrough
= (dev
->transport
->transport_type
==
2936 TRANSPORT_PLUGIN_PHBA_PDEV
);
2938 * Skip the remaining assignments for TCM/PSCSI passthrough
2943 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2945 cmd
->transport_complete_callback
= &transport_xor_callback
;
2946 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2948 case VARIABLE_LENGTH_CMD
:
2949 service_action
= get_unaligned_be16(&cdb
[8]);
2951 * Determine if this is TCM/PSCSI device and we should disable
2952 * internal emulation for this CDB.
2954 passthrough
= (dev
->transport
->transport_type
==
2955 TRANSPORT_PLUGIN_PHBA_PDEV
);
2957 switch (service_action
) {
2958 case XDWRITEREAD_32
:
2959 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2961 goto out_unsupported_cdb
;
2962 size
= transport_get_size(sectors
, cdb
, cmd
);
2964 * Use WRITE_32 and READ_32 opcodes for the emulated
2965 * XDWRITE_READ_32 logic.
2967 cmd
->transport_split_cdb
= &split_cdb_XX_32
;
2968 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2969 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2972 * Skip the remaining assignments for TCM/PSCSI passthrough
2978 * Setup BIDI XOR callback to be run during
2979 * transport_generic_complete_ok()
2981 cmd
->transport_complete_callback
= &transport_xor_callback
;
2982 cmd
->t_tasks_fua
= (cdb
[10] & 0x8);
2985 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2987 goto out_unsupported_cdb
;
2990 size
= transport_get_size(1, cdb
, cmd
);
2992 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2994 goto out_invalid_cdb_field
;
2997 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2998 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3000 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
3001 goto out_invalid_cdb_field
;
3005 pr_err("VARIABLE_LENGTH_CMD service action"
3006 " 0x%04x not supported\n", service_action
);
3007 goto out_unsupported_cdb
;
3010 case MAINTENANCE_IN
:
3011 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3012 /* MAINTENANCE_IN from SCC-2 */
3014 * Check for emulated MI_REPORT_TARGET_PGS.
3016 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
3017 cmd
->transport_emulate_cdb
=
3018 (su_dev
->t10_alua
.alua_type
==
3019 SPC3_ALUA_EMULATED
) ?
3020 core_emulate_report_target_port_groups
:
3023 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3024 (cdb
[8] << 8) | cdb
[9];
3026 /* GPCMD_SEND_KEY from multi media commands */
3027 size
= (cdb
[8] << 8) + cdb
[9];
3029 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3033 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3035 case MODE_SELECT_10
:
3036 size
= (cdb
[7] << 8) + cdb
[8];
3037 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3041 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3044 case GPCMD_READ_BUFFER_CAPACITY
:
3045 case GPCMD_SEND_OPC
:
3048 size
= (cdb
[7] << 8) + cdb
[8];
3049 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3051 case READ_BLOCK_LIMITS
:
3052 size
= READ_BLOCK_LEN
;
3053 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3055 case GPCMD_GET_CONFIGURATION
:
3056 case GPCMD_READ_FORMAT_CAPACITIES
:
3057 case GPCMD_READ_DISC_INFO
:
3058 case GPCMD_READ_TRACK_RZONE_INFO
:
3059 size
= (cdb
[7] << 8) + cdb
[8];
3060 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3062 case PERSISTENT_RESERVE_IN
:
3063 case PERSISTENT_RESERVE_OUT
:
3064 cmd
->transport_emulate_cdb
=
3065 (su_dev
->t10_pr
.res_type
==
3066 SPC3_PERSISTENT_RESERVATIONS
) ?
3067 core_scsi3_emulate_pr
: NULL
;
3068 size
= (cdb
[7] << 8) + cdb
[8];
3069 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3071 case GPCMD_MECHANISM_STATUS
:
3072 case GPCMD_READ_DVD_STRUCTURE
:
3073 size
= (cdb
[8] << 8) + cdb
[9];
3074 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3077 size
= READ_POSITION_LEN
;
3078 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3080 case MAINTENANCE_OUT
:
3081 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3082 /* MAINTENANCE_OUT from SCC-2
3084 * Check for emulated MO_SET_TARGET_PGS.
3086 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3087 cmd
->transport_emulate_cdb
=
3088 (su_dev
->t10_alua
.alua_type
==
3089 SPC3_ALUA_EMULATED
) ?
3090 core_emulate_set_target_port_groups
:
3094 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3095 (cdb
[8] << 8) | cdb
[9];
3097 /* GPCMD_REPORT_KEY from multi media commands */
3098 size
= (cdb
[8] << 8) + cdb
[9];
3100 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3103 size
= (cdb
[3] << 8) + cdb
[4];
3105 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3106 * See spc4r17 section 5.3
3108 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3109 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3110 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3113 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3114 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3117 size
= READ_CAP_LEN
;
3118 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3120 case READ_MEDIA_SERIAL_NUMBER
:
3121 case SECURITY_PROTOCOL_IN
:
3122 case SECURITY_PROTOCOL_OUT
:
3123 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3124 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3126 case SERVICE_ACTION_IN
:
3127 case ACCESS_CONTROL_IN
:
3128 case ACCESS_CONTROL_OUT
:
3130 case READ_ATTRIBUTE
:
3131 case RECEIVE_COPY_RESULTS
:
3132 case WRITE_ATTRIBUTE
:
3133 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3134 (cdb
[12] << 8) | cdb
[13];
3135 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3137 case RECEIVE_DIAGNOSTIC
:
3138 case SEND_DIAGNOSTIC
:
3139 size
= (cdb
[3] << 8) | cdb
[4];
3140 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3142 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3145 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3146 size
= (2336 * sectors
);
3147 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3152 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3156 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3158 case READ_ELEMENT_STATUS
:
3159 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3160 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3163 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3164 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3169 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3170 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3172 if (cdb
[0] == RESERVE_10
)
3173 size
= (cdb
[7] << 8) | cdb
[8];
3175 size
= cmd
->data_length
;
3178 * Setup the legacy emulated handler for SPC-2 and
3179 * >= SPC-3 compatible reservation handling (CRH=1)
3180 * Otherwise, we assume the underlying SCSI logic is
3181 * is running in SPC_PASSTHROUGH, and wants reservations
3182 * emulation disabled.
3184 cmd
->transport_emulate_cdb
=
3185 (su_dev
->t10_pr
.res_type
!=
3187 core_scsi2_emulate_crh
: NULL
;
3188 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3193 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3194 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3196 if (cdb
[0] == RELEASE_10
)
3197 size
= (cdb
[7] << 8) | cdb
[8];
3199 size
= cmd
->data_length
;
3201 cmd
->transport_emulate_cdb
=
3202 (su_dev
->t10_pr
.res_type
!=
3204 core_scsi2_emulate_crh
: NULL
;
3205 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3207 case SYNCHRONIZE_CACHE
:
3208 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3210 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3212 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3213 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3214 cmd
->t_task_lba
= transport_lba_32(cdb
);
3216 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3217 cmd
->t_task_lba
= transport_lba_64(cdb
);
3220 goto out_unsupported_cdb
;
3222 size
= transport_get_size(sectors
, cdb
, cmd
);
3223 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3226 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3228 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3231 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3232 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3234 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3236 * Check to ensure that LBA + Range does not exceed past end of
3237 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3239 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
3240 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3241 goto out_invalid_cdb_field
;
3245 size
= get_unaligned_be16(&cdb
[7]);
3246 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3249 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3251 goto out_unsupported_cdb
;
3254 size
= transport_get_size(1, cdb
, cmd
);
3256 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3257 goto out_invalid_cdb_field
;
3260 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
3261 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3263 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3264 goto out_invalid_cdb_field
;
3267 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3269 goto out_unsupported_cdb
;
3272 size
= transport_get_size(1, cdb
, cmd
);
3274 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3275 goto out_invalid_cdb_field
;
3278 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3279 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3281 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3282 * of byte 1 bit 3 UNMAP instead of original reserved field
3284 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3285 goto out_invalid_cdb_field
;
3287 case ALLOW_MEDIUM_REMOVAL
:
3288 case GPCMD_CLOSE_TRACK
:
3290 case INITIALIZE_ELEMENT_STATUS
:
3291 case GPCMD_LOAD_UNLOAD
:
3294 case GPCMD_SET_SPEED
:
3297 case TEST_UNIT_READY
:
3299 case WRITE_FILEMARKS
:
3301 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3304 cmd
->transport_emulate_cdb
=
3305 transport_core_report_lun_response
;
3306 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3308 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3309 * See spc4r17 section 5.3
3311 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3312 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3313 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3316 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3317 " 0x%02x, sending CHECK_CONDITION.\n",
3318 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3319 goto out_unsupported_cdb
;
3322 if (size
!= cmd
->data_length
) {
3323 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3324 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3325 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3326 cmd
->data_length
, size
, cdb
[0]);
3328 cmd
->cmd_spdtl
= size
;
3330 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3331 pr_err("Rejecting underflow/overflow"
3333 goto out_invalid_cdb_field
;
3336 * Reject READ_* or WRITE_* with overflow/underflow for
3337 * type SCF_SCSI_DATA_SG_IO_CDB.
3339 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3340 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3341 " CDB on non 512-byte sector setup subsystem"
3342 " plugin: %s\n", dev
->transport
->name
);
3343 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3344 goto out_invalid_cdb_field
;
3347 if (size
> cmd
->data_length
) {
3348 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3349 cmd
->residual_count
= (size
- cmd
->data_length
);
3351 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3352 cmd
->residual_count
= (cmd
->data_length
- size
);
3354 cmd
->data_length
= size
;
3357 /* Let's limit control cdbs to a page, for simplicity's sake. */
3358 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3360 goto out_invalid_cdb_field
;
3362 transport_set_supported_SAM_opcode(cmd
);
3365 out_unsupported_cdb
:
3366 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3367 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3369 out_invalid_cdb_field
:
3370 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3371 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3376 * Called from transport_generic_complete_ok() and
3377 * transport_generic_request_failure() to determine which dormant/delayed
3378 * and ordered cmds need to have their tasks added to the execution queue.
3380 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3382 struct se_device
*dev
= cmd
->se_dev
;
3383 struct se_cmd
*cmd_p
, *cmd_tmp
;
3384 int new_active_tasks
= 0;
3386 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3387 atomic_dec(&dev
->simple_cmds
);
3388 smp_mb__after_atomic_dec();
3389 dev
->dev_cur_ordered_id
++;
3390 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3391 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3392 cmd
->se_ordered_id
);
3393 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3394 atomic_dec(&dev
->dev_hoq_count
);
3395 smp_mb__after_atomic_dec();
3396 dev
->dev_cur_ordered_id
++;
3397 pr_debug("Incremented dev_cur_ordered_id: %u for"
3398 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3399 cmd
->se_ordered_id
);
3400 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3401 spin_lock(&dev
->ordered_cmd_lock
);
3402 list_del(&cmd
->se_ordered_node
);
3403 atomic_dec(&dev
->dev_ordered_sync
);
3404 smp_mb__after_atomic_dec();
3405 spin_unlock(&dev
->ordered_cmd_lock
);
3407 dev
->dev_cur_ordered_id
++;
3408 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3409 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3412 * Process all commands up to the last received
3413 * ORDERED task attribute which requires another blocking
3416 spin_lock(&dev
->delayed_cmd_lock
);
3417 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3418 &dev
->delayed_cmd_list
, se_delayed_node
) {
3420 list_del(&cmd_p
->se_delayed_node
);
3421 spin_unlock(&dev
->delayed_cmd_lock
);
3423 pr_debug("Calling add_tasks() for"
3424 " cmd_p: 0x%02x Task Attr: 0x%02x"
3425 " Dormant -> Active, se_ordered_id: %u\n",
3426 cmd_p
->t_task_cdb
[0],
3427 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3429 transport_add_tasks_from_cmd(cmd_p
);
3432 spin_lock(&dev
->delayed_cmd_lock
);
3433 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3436 spin_unlock(&dev
->delayed_cmd_lock
);
3438 * If new tasks have become active, wake up the transport thread
3439 * to do the processing of the Active tasks.
3441 if (new_active_tasks
!= 0)
3442 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3445 static int transport_complete_qf(struct se_cmd
*cmd
)
3449 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
3450 return cmd
->se_tfo
->queue_status(cmd
);
3452 switch (cmd
->data_direction
) {
3453 case DMA_FROM_DEVICE
:
3454 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3457 if (cmd
->t_bidi_data_sg
) {
3458 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3462 /* Fall through for DMA_TO_DEVICE */
3464 ret
= cmd
->se_tfo
->queue_status(cmd
);
3473 static void transport_handle_queue_full(
3475 struct se_device
*dev
,
3476 int (*qf_callback
)(struct se_cmd
*))
3478 spin_lock_irq(&dev
->qf_cmd_lock
);
3479 cmd
->se_cmd_flags
|= SCF_EMULATE_QUEUE_FULL
;
3480 cmd
->transport_qf_callback
= qf_callback
;
3481 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3482 atomic_inc(&dev
->dev_qf_count
);
3483 smp_mb__after_atomic_inc();
3484 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3486 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3489 static void transport_generic_complete_ok(struct se_cmd
*cmd
)
3491 int reason
= 0, ret
;
3493 * Check if we need to move delayed/dormant tasks from cmds on the
3494 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3497 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3498 transport_complete_task_attr(cmd
);
3500 * Check to schedule QUEUE_FULL work, or execute an existing
3501 * cmd->transport_qf_callback()
3503 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3504 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3506 if (cmd
->transport_qf_callback
) {
3507 ret
= cmd
->transport_qf_callback(cmd
);
3511 cmd
->transport_qf_callback
= NULL
;
3515 * Check if we need to retrieve a sense buffer from
3516 * the struct se_cmd in question.
3518 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3519 if (transport_get_sense_data(cmd
) < 0)
3520 reason
= TCM_NON_EXISTENT_LUN
;
3523 * Only set when an struct se_task->task_scsi_status returned
3524 * a non GOOD status.
3526 if (cmd
->scsi_status
) {
3527 ret
= transport_send_check_condition_and_sense(
3532 transport_lun_remove_cmd(cmd
);
3533 transport_cmd_check_stop_to_fabric(cmd
);
3538 * Check for a callback, used by amongst other things
3539 * XDWRITE_READ_10 emulation.
3541 if (cmd
->transport_complete_callback
)
3542 cmd
->transport_complete_callback(cmd
);
3544 switch (cmd
->data_direction
) {
3545 case DMA_FROM_DEVICE
:
3546 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3547 if (cmd
->se_lun
->lun_sep
) {
3548 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3551 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3553 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3558 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3559 if (cmd
->se_lun
->lun_sep
) {
3560 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3563 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3565 * Check if we need to send READ payload for BIDI-COMMAND
3567 if (cmd
->t_bidi_data_sg
) {
3568 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3569 if (cmd
->se_lun
->lun_sep
) {
3570 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3573 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3574 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3579 /* Fall through for DMA_TO_DEVICE */
3581 ret
= cmd
->se_tfo
->queue_status(cmd
);
3590 transport_lun_remove_cmd(cmd
);
3591 transport_cmd_check_stop_to_fabric(cmd
);
3595 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3596 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3597 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
3600 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3602 struct se_task
*task
, *task_tmp
;
3603 unsigned long flags
;
3605 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3606 list_for_each_entry_safe(task
, task_tmp
,
3607 &cmd
->t_task_list
, t_list
) {
3608 if (task
->task_flags
& TF_ACTIVE
)
3611 kfree(task
->task_sg_bidi
);
3612 kfree(task
->task_sg
);
3614 list_del(&task
->t_list
);
3616 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3617 cmd
->se_dev
->transport
->free_task(task
);
3618 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3620 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3623 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3625 struct scatterlist
*sg
;
3628 for_each_sg(sgl
, sg
, nents
, count
)
3629 __free_page(sg_page(sg
));
3634 static inline void transport_free_pages(struct se_cmd
*cmd
)
3636 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3639 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3640 cmd
->t_data_sg
= NULL
;
3641 cmd
->t_data_nents
= 0;
3643 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3644 cmd
->t_bidi_data_sg
= NULL
;
3645 cmd
->t_bidi_data_nents
= 0;
3649 * transport_put_cmd - release a reference to a command
3650 * @cmd: command to release
3652 * This routine releases our reference to the command and frees it if possible.
3654 static void transport_put_cmd(struct se_cmd
*cmd
)
3656 unsigned long flags
;
3659 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3660 if (atomic_read(&cmd
->t_fe_count
)) {
3661 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3665 if (atomic_read(&cmd
->t_se_count
)) {
3666 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3670 if (atomic_read(&cmd
->transport_dev_active
)) {
3671 atomic_set(&cmd
->transport_dev_active
, 0);
3672 transport_all_task_dev_remove_state(cmd
);
3675 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3677 if (free_tasks
!= 0)
3678 transport_free_dev_tasks(cmd
);
3680 transport_free_pages(cmd
);
3681 transport_release_cmd(cmd
);
3684 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3688 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3689 * allocating in the core.
3690 * @cmd: Associated se_cmd descriptor
3691 * @mem: SGL style memory for TCM WRITE / READ
3692 * @sg_mem_num: Number of SGL elements
3693 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3694 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3696 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3699 int transport_generic_map_mem_to_cmd(
3701 struct scatterlist
*sgl
,
3703 struct scatterlist
*sgl_bidi
,
3706 if (!sgl
|| !sgl_count
)
3709 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3710 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3712 cmd
->t_data_sg
= sgl
;
3713 cmd
->t_data_nents
= sgl_count
;
3715 if (sgl_bidi
&& sgl_bidi_count
) {
3716 cmd
->t_bidi_data_sg
= sgl_bidi
;
3717 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3719 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3724 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3726 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
3728 struct se_device
*dev
= cmd
->se_dev
;
3729 int set_counts
= 1, rc
, task_cdbs
;
3732 * Setup any BIDI READ tasks and memory from
3733 * cmd->t_mem_bidi_list so the READ struct se_tasks
3734 * are queued first for the non pSCSI passthrough case.
3736 if (cmd
->t_bidi_data_sg
&&
3737 (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
3738 rc
= transport_allocate_tasks(cmd
,
3741 cmd
->t_bidi_data_sg
,
3742 cmd
->t_bidi_data_nents
);
3744 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3745 cmd
->scsi_sense_reason
=
3746 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3749 atomic_inc(&cmd
->t_fe_count
);
3750 atomic_inc(&cmd
->t_se_count
);
3754 * Setup the tasks and memory from cmd->t_mem_list
3755 * Note for BIDI transfers this will contain the WRITE payload
3757 task_cdbs
= transport_allocate_tasks(cmd
,
3759 cmd
->data_direction
,
3762 if (task_cdbs
<= 0) {
3763 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3764 cmd
->scsi_sense_reason
=
3765 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3770 atomic_inc(&cmd
->t_fe_count
);
3771 atomic_inc(&cmd
->t_se_count
);
3774 cmd
->t_task_list_num
= task_cdbs
;
3776 atomic_set(&cmd
->t_task_cdbs_left
, task_cdbs
);
3777 atomic_set(&cmd
->t_task_cdbs_ex_left
, task_cdbs
);
3778 atomic_set(&cmd
->t_task_cdbs_timeout_left
, task_cdbs
);
3782 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3784 struct scatterlist
*sg
= cmd
->t_data_sg
;
3788 * We need to take into account a possible offset here for fabrics like
3789 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3790 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3792 return kmap(sg_page(sg
)) + sg
->offset
;
3794 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3796 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3798 kunmap(sg_page(cmd
->t_data_sg
));
3800 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3803 transport_generic_get_mem(struct se_cmd
*cmd
)
3805 u32 length
= cmd
->data_length
;
3810 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3811 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3812 if (!cmd
->t_data_sg
)
3815 cmd
->t_data_nents
= nents
;
3816 sg_init_table(cmd
->t_data_sg
, nents
);
3819 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3820 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3824 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3832 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3835 kfree(cmd
->t_data_sg
);
3836 cmd
->t_data_sg
= NULL
;
3840 /* Reduce sectors if they are too long for the device */
3841 static inline sector_t
transport_limit_task_sectors(
3842 struct se_device
*dev
,
3843 unsigned long long lba
,
3846 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3848 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3849 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3850 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3857 * This function can be used by HW target mode drivers to create a linked
3858 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3859 * This is intended to be called during the completion path by TCM Core
3860 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3862 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3864 struct scatterlist
*sg_first
= NULL
;
3865 struct scatterlist
*sg_prev
= NULL
;
3866 int sg_prev_nents
= 0;
3867 struct scatterlist
*sg
;
3868 struct se_task
*task
;
3869 u32 chained_nents
= 0;
3872 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3875 * Walk the struct se_task list and setup scatterlist chains
3876 * for each contiguously allocated struct se_task->task_sg[].
3878 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3883 sg_first
= task
->task_sg
;
3884 chained_nents
= task
->task_sg_nents
;
3886 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3887 chained_nents
+= task
->task_sg_nents
;
3890 * For the padded tasks, use the extra SGL vector allocated
3891 * in transport_allocate_data_tasks() for the sg_prev_nents
3892 * offset into sg_chain() above.
3894 * We do not need the padding for the last task (or a single
3895 * task), but in that case we will never use the sg_prev_nents
3896 * value below which would be incorrect.
3898 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3899 sg_prev
= task
->task_sg
;
3902 * Setup the starting pointer and total t_tasks_sg_linked_no including
3903 * padding SGs for linking and to mark the end.
3905 cmd
->t_tasks_sg_chained
= sg_first
;
3906 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3908 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3909 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3910 cmd
->t_tasks_sg_chained_no
);
3912 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
3913 cmd
->t_tasks_sg_chained_no
, i
) {
3915 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3916 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
3917 if (sg_is_chain(sg
))
3918 pr_debug("SG: %p sg_is_chain=1\n", sg
);
3920 pr_debug("SG: %p sg_is_last=1\n", sg
);
3923 EXPORT_SYMBOL(transport_do_task_sg_chain
);
3926 * Break up cmd into chunks transport can handle
3928 static int transport_allocate_data_tasks(
3930 unsigned long long lba
,
3931 enum dma_data_direction data_direction
,
3932 struct scatterlist
*sgl
,
3933 unsigned int sgl_nents
)
3935 unsigned char *cdb
= NULL
;
3936 struct se_task
*task
;
3937 struct se_device
*dev
= cmd
->se_dev
;
3938 unsigned long flags
;
3940 sector_t sectors
, dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
3941 u32 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
3942 struct scatterlist
*sg
;
3943 struct scatterlist
*cmd_sg
;
3945 WARN_ON(cmd
->data_length
% sector_size
);
3946 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
3947 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
3950 for (i
= 0; i
< task_count
; i
++) {
3951 unsigned int task_size
, task_sg_nents_padded
;
3954 task
= transport_generic_get_task(cmd
, data_direction
);
3958 task
->task_lba
= lba
;
3959 task
->task_sectors
= min(sectors
, dev_max_sectors
);
3960 task
->task_size
= task
->task_sectors
* sector_size
;
3962 cdb
= dev
->transport
->get_cdb(task
);
3965 memcpy(cdb
, cmd
->t_task_cdb
,
3966 scsi_command_size(cmd
->t_task_cdb
));
3968 /* Update new cdb with updated lba/sectors */
3969 cmd
->transport_split_cdb(task
->task_lba
, task
->task_sectors
, cdb
);
3971 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3972 * in order to calculate the number per task SGL entries
3974 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
3976 * Check if the fabric module driver is requesting that all
3977 * struct se_task->task_sg[] be chained together.. If so,
3978 * then allocate an extra padding SG entry for linking and
3979 * marking the end of the chained SGL for every task except
3980 * the last one for (task_count > 1) operation, or skipping
3981 * the extra padding for the (task_count == 1) case.
3983 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
3984 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
3986 task_sg_nents_padded
= task
->task_sg_nents
;
3988 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
3989 task_sg_nents_padded
, GFP_KERNEL
);
3990 if (!task
->task_sg
) {
3991 cmd
->se_dev
->transport
->free_task(task
);
3995 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
3997 task_size
= task
->task_size
;
3999 /* Build new sgl, only up to task_size */
4000 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
4001 if (cmd_sg
->length
> task_size
)
4005 task_size
-= cmd_sg
->length
;
4006 cmd_sg
= sg_next(cmd_sg
);
4009 lba
+= task
->task_sectors
;
4010 sectors
-= task
->task_sectors
;
4012 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4013 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4014 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4021 transport_allocate_control_task(struct se_cmd
*cmd
)
4023 struct se_device
*dev
= cmd
->se_dev
;
4025 struct se_task
*task
;
4026 unsigned long flags
;
4028 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
4032 cdb
= dev
->transport
->get_cdb(task
);
4034 memcpy(cdb
, cmd
->t_task_cdb
,
4035 scsi_command_size(cmd
->t_task_cdb
));
4037 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
4039 if (!task
->task_sg
) {
4040 cmd
->se_dev
->transport
->free_task(task
);
4044 memcpy(task
->task_sg
, cmd
->t_data_sg
,
4045 sizeof(struct scatterlist
) * cmd
->t_data_nents
);
4046 task
->task_size
= cmd
->data_length
;
4047 task
->task_sg_nents
= cmd
->t_data_nents
;
4049 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4050 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4051 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4053 /* Success! Return number of tasks allocated */
4057 static u32
transport_allocate_tasks(
4059 unsigned long long lba
,
4060 enum dma_data_direction data_direction
,
4061 struct scatterlist
*sgl
,
4062 unsigned int sgl_nents
)
4064 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
4065 if (transport_cmd_get_valid_sectors(cmd
) < 0)
4068 return transport_allocate_data_tasks(cmd
, lba
, data_direction
,
4071 return transport_allocate_control_task(cmd
);
4076 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4078 * Allocate storage transport resources from a set of values predefined
4079 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4080 * Any non zero return here is treated as an "out of resource' op here.
4083 * Generate struct se_task(s) and/or their payloads for this CDB.
4085 int transport_generic_new_cmd(struct se_cmd
*cmd
)
4090 * Determine is the TCM fabric module has already allocated physical
4091 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4094 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
4096 ret
= transport_generic_get_mem(cmd
);
4101 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4102 * control or data CDB types, and perform the map to backend subsystem
4103 * code from SGL memory allocated here by transport_generic_get_mem(), or
4104 * via pre-existing SGL memory setup explictly by fabric module code with
4105 * transport_generic_map_mem_to_cmd().
4107 ret
= transport_new_cmd_obj(cmd
);
4111 * For WRITEs, let the fabric know its buffer is ready..
4112 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4113 * will be added to the struct se_device execution queue after its WRITE
4114 * data has arrived. (ie: It gets handled by the transport processing
4115 * thread a second time)
4117 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4118 transport_add_tasks_to_state_queue(cmd
);
4119 return transport_generic_write_pending(cmd
);
4122 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4123 * to the execution queue.
4125 transport_execute_tasks(cmd
);
4128 EXPORT_SYMBOL(transport_generic_new_cmd
);
4130 /* transport_generic_process_write():
4134 void transport_generic_process_write(struct se_cmd
*cmd
)
4136 transport_execute_tasks(cmd
);
4138 EXPORT_SYMBOL(transport_generic_process_write
);
4140 static int transport_write_pending_qf(struct se_cmd
*cmd
)
4142 return cmd
->se_tfo
->write_pending(cmd
);
4145 /* transport_generic_write_pending():
4149 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4151 unsigned long flags
;
4154 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4155 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4156 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4158 if (cmd
->transport_qf_callback
) {
4159 ret
= cmd
->transport_qf_callback(cmd
);
4165 cmd
->transport_qf_callback
= NULL
;
4170 * Clear the se_cmd for WRITE_PENDING status in order to set
4171 * cmd->t_transport_active=0 so that transport_generic_handle_data
4172 * can be called from HW target mode interrupt code. This is safe
4173 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4174 * because the se_cmd->se_lun pointer is not being cleared.
4176 transport_cmd_check_stop(cmd
, 1, 0);
4179 * Call the fabric write_pending function here to let the
4180 * frontend know that WRITE buffers are ready.
4182 ret
= cmd
->se_tfo
->write_pending(cmd
);
4188 return PYX_TRANSPORT_WRITE_PENDING
;
4191 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4192 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4193 transport_handle_queue_full(cmd
, cmd
->se_dev
,
4194 transport_write_pending_qf
);
4199 * transport_release_cmd - free a command
4200 * @cmd: command to free
4202 * This routine unconditionally frees a command, and reference counting
4203 * or list removal must be done in the caller.
4205 void transport_release_cmd(struct se_cmd
*cmd
)
4207 BUG_ON(!cmd
->se_tfo
);
4209 if (cmd
->se_tmr_req
)
4210 core_tmr_release_req(cmd
->se_tmr_req
);
4211 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
4212 kfree(cmd
->t_task_cdb
);
4213 cmd
->se_tfo
->release_cmd(cmd
);
4215 EXPORT_SYMBOL(transport_release_cmd
);
4217 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
4219 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
4220 if (wait_for_tasks
&& cmd
->se_tmr_req
)
4221 transport_wait_for_tasks(cmd
);
4223 transport_release_cmd(cmd
);
4226 transport_wait_for_tasks(cmd
);
4228 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4231 transport_lun_remove_cmd(cmd
);
4233 transport_free_dev_tasks(cmd
);
4235 transport_put_cmd(cmd
);
4238 EXPORT_SYMBOL(transport_generic_free_cmd
);
4240 /* transport_lun_wait_for_tasks():
4242 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4243 * an struct se_lun to be successfully shutdown.
4245 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4247 unsigned long flags
;
4250 * If the frontend has already requested this struct se_cmd to
4251 * be stopped, we can safely ignore this struct se_cmd.
4253 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4254 if (atomic_read(&cmd
->t_transport_stop
)) {
4255 atomic_set(&cmd
->transport_lun_stop
, 0);
4256 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4257 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4258 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4259 transport_cmd_check_stop(cmd
, 1, 0);
4262 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4263 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4265 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4267 ret
= transport_stop_tasks_for_cmd(cmd
);
4269 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4270 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4272 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4273 cmd
->se_tfo
->get_task_tag(cmd
));
4274 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4275 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4276 cmd
->se_tfo
->get_task_tag(cmd
));
4278 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
4283 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4285 struct se_cmd
*cmd
= NULL
;
4286 unsigned long lun_flags
, cmd_flags
;
4288 * Do exception processing and return CHECK_CONDITION status to the
4291 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4292 while (!list_empty(&lun
->lun_cmd_list
)) {
4293 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4294 struct se_cmd
, se_lun_node
);
4295 list_del(&cmd
->se_lun_node
);
4297 atomic_set(&cmd
->transport_lun_active
, 0);
4299 * This will notify iscsi_target_transport.c:
4300 * transport_cmd_check_stop() that a LUN shutdown is in
4301 * progress for the iscsi_cmd_t.
4303 spin_lock(&cmd
->t_state_lock
);
4304 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4305 "_lun_stop for ITT: 0x%08x\n",
4306 cmd
->se_lun
->unpacked_lun
,
4307 cmd
->se_tfo
->get_task_tag(cmd
));
4308 atomic_set(&cmd
->transport_lun_stop
, 1);
4309 spin_unlock(&cmd
->t_state_lock
);
4311 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4314 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4315 cmd
->se_tfo
->get_task_tag(cmd
),
4316 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4320 * If the Storage engine still owns the iscsi_cmd_t, determine
4321 * and/or stop its context.
4323 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4324 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4325 cmd
->se_tfo
->get_task_tag(cmd
));
4327 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4328 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4332 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4333 "_wait_for_tasks(): SUCCESS\n",
4334 cmd
->se_lun
->unpacked_lun
,
4335 cmd
->se_tfo
->get_task_tag(cmd
));
4337 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4338 if (!atomic_read(&cmd
->transport_dev_active
)) {
4339 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4342 atomic_set(&cmd
->transport_dev_active
, 0);
4343 transport_all_task_dev_remove_state(cmd
);
4344 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4346 transport_free_dev_tasks(cmd
);
4348 * The Storage engine stopped this struct se_cmd before it was
4349 * send to the fabric frontend for delivery back to the
4350 * Initiator Node. Return this SCSI CDB back with an
4351 * CHECK_CONDITION status.
4354 transport_send_check_condition_and_sense(cmd
,
4355 TCM_NON_EXISTENT_LUN
, 0);
4357 * If the fabric frontend is waiting for this iscsi_cmd_t to
4358 * be released, notify the waiting thread now that LU has
4359 * finished accessing it.
4361 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4362 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4363 pr_debug("SE_LUN[%d] - Detected FE stop for"
4364 " struct se_cmd: %p ITT: 0x%08x\n",
4366 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4368 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4370 transport_cmd_check_stop(cmd
, 1, 0);
4371 complete(&cmd
->transport_lun_fe_stop_comp
);
4372 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4375 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4376 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4378 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4379 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4381 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4384 static int transport_clear_lun_thread(void *p
)
4386 struct se_lun
*lun
= (struct se_lun
*)p
;
4388 __transport_clear_lun_from_sessions(lun
);
4389 complete(&lun
->lun_shutdown_comp
);
4394 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4396 struct task_struct
*kt
;
4398 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4399 "tcm_cl_%u", lun
->unpacked_lun
);
4401 pr_err("Unable to start clear_lun thread\n");
4404 wait_for_completion(&lun
->lun_shutdown_comp
);
4410 * transport_wait_for_tasks - wait for completion to occur
4411 * @cmd: command to wait
4413 * Called from frontend fabric context to wait for storage engine
4414 * to pause and/or release frontend generated struct se_cmd.
4416 void transport_wait_for_tasks(struct se_cmd
*cmd
)
4418 unsigned long flags
;
4420 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4421 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
)) {
4422 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4426 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4427 * has been set in transport_set_supported_SAM_opcode().
4429 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) && !cmd
->se_tmr_req
) {
4430 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4434 * If we are already stopped due to an external event (ie: LUN shutdown)
4435 * sleep until the connection can have the passed struct se_cmd back.
4436 * The cmd->transport_lun_stopped_sem will be upped by
4437 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4438 * has completed its operation on the struct se_cmd.
4440 if (atomic_read(&cmd
->transport_lun_stop
)) {
4442 pr_debug("wait_for_tasks: Stopping"
4443 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4444 "_stop_comp); for ITT: 0x%08x\n",
4445 cmd
->se_tfo
->get_task_tag(cmd
));
4447 * There is a special case for WRITES where a FE exception +
4448 * LUN shutdown means ConfigFS context is still sleeping on
4449 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4450 * We go ahead and up transport_lun_stop_comp just to be sure
4453 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4454 complete(&cmd
->transport_lun_stop_comp
);
4455 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4456 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4458 transport_all_task_dev_remove_state(cmd
);
4460 * At this point, the frontend who was the originator of this
4461 * struct se_cmd, now owns the structure and can be released through
4462 * normal means below.
4464 pr_debug("wait_for_tasks: Stopped"
4465 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4466 "stop_comp); for ITT: 0x%08x\n",
4467 cmd
->se_tfo
->get_task_tag(cmd
));
4469 atomic_set(&cmd
->transport_lun_stop
, 0);
4471 if (!atomic_read(&cmd
->t_transport_active
) ||
4472 atomic_read(&cmd
->t_transport_aborted
)) {
4473 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4477 atomic_set(&cmd
->t_transport_stop
, 1);
4479 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4480 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4481 " = TRUE\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4482 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
,
4483 cmd
->deferred_t_state
);
4485 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4487 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4489 wait_for_completion(&cmd
->t_transport_stop_comp
);
4491 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4492 atomic_set(&cmd
->t_transport_active
, 0);
4493 atomic_set(&cmd
->t_transport_stop
, 0);
4495 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4496 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4497 cmd
->se_tfo
->get_task_tag(cmd
));
4499 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4501 EXPORT_SYMBOL(transport_wait_for_tasks
);
4503 static int transport_get_sense_codes(
4508 *asc
= cmd
->scsi_asc
;
4509 *ascq
= cmd
->scsi_ascq
;
4514 static int transport_set_sense_codes(
4519 cmd
->scsi_asc
= asc
;
4520 cmd
->scsi_ascq
= ascq
;
4525 int transport_send_check_condition_and_sense(
4530 unsigned char *buffer
= cmd
->sense_buffer
;
4531 unsigned long flags
;
4533 u8 asc
= 0, ascq
= 0;
4535 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4536 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4537 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4540 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4541 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4543 if (!reason
&& from_transport
)
4546 if (!from_transport
)
4547 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4549 * Data Segment and SenseLength of the fabric response PDU.
4551 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4552 * from include/scsi/scsi_cmnd.h
4554 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4555 TRANSPORT_SENSE_BUFFER
);
4557 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4558 * SENSE KEY values from include/scsi/scsi.h
4561 case TCM_NON_EXISTENT_LUN
:
4563 buffer
[offset
] = 0x70;
4564 /* ILLEGAL REQUEST */
4565 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4566 /* LOGICAL UNIT NOT SUPPORTED */
4567 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4569 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4570 case TCM_SECTOR_COUNT_TOO_MANY
:
4572 buffer
[offset
] = 0x70;
4573 /* ILLEGAL REQUEST */
4574 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4575 /* INVALID COMMAND OPERATION CODE */
4576 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4578 case TCM_UNKNOWN_MODE_PAGE
:
4580 buffer
[offset
] = 0x70;
4581 /* ILLEGAL REQUEST */
4582 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4583 /* INVALID FIELD IN CDB */
4584 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4586 case TCM_CHECK_CONDITION_ABORT_CMD
:
4588 buffer
[offset
] = 0x70;
4589 /* ABORTED COMMAND */
4590 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4591 /* BUS DEVICE RESET FUNCTION OCCURRED */
4592 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4593 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4595 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4597 buffer
[offset
] = 0x70;
4598 /* ABORTED COMMAND */
4599 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4601 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4602 /* NOT ENOUGH UNSOLICITED DATA */
4603 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4605 case TCM_INVALID_CDB_FIELD
:
4607 buffer
[offset
] = 0x70;
4608 /* ABORTED COMMAND */
4609 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4610 /* INVALID FIELD IN CDB */
4611 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4613 case TCM_INVALID_PARAMETER_LIST
:
4615 buffer
[offset
] = 0x70;
4616 /* ABORTED COMMAND */
4617 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4618 /* INVALID FIELD IN PARAMETER LIST */
4619 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4621 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4623 buffer
[offset
] = 0x70;
4624 /* ABORTED COMMAND */
4625 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4627 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4628 /* UNEXPECTED_UNSOLICITED_DATA */
4629 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4631 case TCM_SERVICE_CRC_ERROR
:
4633 buffer
[offset
] = 0x70;
4634 /* ABORTED COMMAND */
4635 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4636 /* PROTOCOL SERVICE CRC ERROR */
4637 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4639 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4641 case TCM_SNACK_REJECTED
:
4643 buffer
[offset
] = 0x70;
4644 /* ABORTED COMMAND */
4645 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4647 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4648 /* FAILED RETRANSMISSION REQUEST */
4649 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4651 case TCM_WRITE_PROTECTED
:
4653 buffer
[offset
] = 0x70;
4655 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4656 /* WRITE PROTECTED */
4657 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4659 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4661 buffer
[offset
] = 0x70;
4662 /* UNIT ATTENTION */
4663 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4664 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4665 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4666 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4668 case TCM_CHECK_CONDITION_NOT_READY
:
4670 buffer
[offset
] = 0x70;
4672 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4673 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4674 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4675 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4677 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4680 buffer
[offset
] = 0x70;
4681 /* ILLEGAL REQUEST */
4682 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4683 /* LOGICAL UNIT COMMUNICATION FAILURE */
4684 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4688 * This code uses linux/include/scsi/scsi.h SAM status codes!
4690 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4692 * Automatically padded, this value is encoded in the fabric's
4693 * data_length response PDU containing the SCSI defined sense data.
4695 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4698 return cmd
->se_tfo
->queue_status(cmd
);
4700 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4702 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4706 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4708 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4711 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4712 " status for CDB: 0x%02x ITT: 0x%08x\n",
4714 cmd
->se_tfo
->get_task_tag(cmd
));
4716 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4717 cmd
->se_tfo
->queue_status(cmd
);
4722 EXPORT_SYMBOL(transport_check_aborted_status
);
4724 void transport_send_task_abort(struct se_cmd
*cmd
)
4726 unsigned long flags
;
4728 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4729 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4730 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4733 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4736 * If there are still expected incoming fabric WRITEs, we wait
4737 * until until they have completed before sending a TASK_ABORTED
4738 * response. This response with TASK_ABORTED status will be
4739 * queued back to fabric module by transport_check_aborted_status().
4741 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4742 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4743 atomic_inc(&cmd
->t_transport_aborted
);
4744 smp_mb__after_atomic_inc();
4745 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4746 transport_new_cmd_failure(cmd
);
4750 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4752 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4753 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4754 cmd
->se_tfo
->get_task_tag(cmd
));
4756 cmd
->se_tfo
->queue_status(cmd
);
4759 /* transport_generic_do_tmr():
4763 int transport_generic_do_tmr(struct se_cmd
*cmd
)
4765 struct se_device
*dev
= cmd
->se_dev
;
4766 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4769 switch (tmr
->function
) {
4770 case TMR_ABORT_TASK
:
4771 tmr
->response
= TMR_FUNCTION_REJECTED
;
4773 case TMR_ABORT_TASK_SET
:
4775 case TMR_CLEAR_TASK_SET
:
4776 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4779 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4780 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4781 TMR_FUNCTION_REJECTED
;
4783 case TMR_TARGET_WARM_RESET
:
4784 tmr
->response
= TMR_FUNCTION_REJECTED
;
4786 case TMR_TARGET_COLD_RESET
:
4787 tmr
->response
= TMR_FUNCTION_REJECTED
;
4790 pr_err("Uknown TMR function: 0x%02x.\n",
4792 tmr
->response
= TMR_FUNCTION_REJECTED
;
4796 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4797 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4799 transport_cmd_check_stop(cmd
, 2, 0);
4803 /* transport_processing_thread():
4807 static int transport_processing_thread(void *param
)
4811 struct se_device
*dev
= (struct se_device
*) param
;
4813 set_user_nice(current
, -20);
4815 while (!kthread_should_stop()) {
4816 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4817 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4818 kthread_should_stop());
4823 __transport_execute_tasks(dev
);
4825 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4829 switch (cmd
->t_state
) {
4830 case TRANSPORT_NEW_CMD
:
4833 case TRANSPORT_NEW_CMD_MAP
:
4834 if (!cmd
->se_tfo
->new_cmd_map
) {
4835 pr_err("cmd->se_tfo->new_cmd_map is"
4836 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4839 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4841 cmd
->transport_error_status
= ret
;
4842 transport_generic_request_failure(cmd
, NULL
,
4843 0, (cmd
->data_direction
!=
4847 ret
= transport_generic_new_cmd(cmd
);
4851 cmd
->transport_error_status
= ret
;
4852 transport_generic_request_failure(cmd
, NULL
,
4853 0, (cmd
->data_direction
!=
4857 case TRANSPORT_PROCESS_WRITE
:
4858 transport_generic_process_write(cmd
);
4860 case TRANSPORT_COMPLETE_OK
:
4861 transport_stop_all_task_timers(cmd
);
4862 transport_generic_complete_ok(cmd
);
4864 case TRANSPORT_REMOVE
:
4865 transport_put_cmd(cmd
);
4867 case TRANSPORT_FREE_CMD_INTR
:
4868 transport_generic_free_cmd(cmd
, 0);
4870 case TRANSPORT_PROCESS_TMR
:
4871 transport_generic_do_tmr(cmd
);
4873 case TRANSPORT_COMPLETE_FAILURE
:
4874 transport_generic_request_failure(cmd
, NULL
, 1, 1);
4876 case TRANSPORT_COMPLETE_TIMEOUT
:
4877 transport_stop_all_task_timers(cmd
);
4878 transport_generic_request_timeout(cmd
);
4880 case TRANSPORT_COMPLETE_QF_WP
:
4881 transport_generic_write_pending(cmd
);
4884 pr_err("Unknown t_state: %d deferred_t_state:"
4885 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
4886 " %u\n", cmd
->t_state
, cmd
->deferred_t_state
,
4887 cmd
->se_tfo
->get_task_tag(cmd
),
4888 cmd
->se_tfo
->get_cmd_state(cmd
),
4889 cmd
->se_lun
->unpacked_lun
);
4897 WARN_ON(!list_empty(&dev
->state_task_list
));
4898 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4899 dev
->process_thread
= NULL
;