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 <linux/module.h>
40 #include <linux/ratelimit.h>
41 #include <asm/unaligned.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/scsi_tcq.h>
48 #include <target/target_core_base.h>
49 #include <target/target_core_backend.h>
50 #include <target/target_core_fabric.h>
51 #include <target/target_core_configfs.h>
53 #include "target_core_internal.h"
54 #include "target_core_alua.h"
55 #include "target_core_pr.h"
56 #include "target_core_ua.h"
58 static int sub_api_initialized
;
60 static struct workqueue_struct
*target_completion_wq
;
61 static struct kmem_cache
*se_sess_cache
;
62 struct kmem_cache
*se_ua_cache
;
63 struct kmem_cache
*t10_pr_reg_cache
;
64 struct kmem_cache
*t10_alua_lu_gp_cache
;
65 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
66 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
67 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
69 static void transport_complete_task_attr(struct se_cmd
*cmd
);
70 static void transport_handle_queue_full(struct se_cmd
*cmd
,
71 struct se_device
*dev
);
72 static int transport_generic_get_mem(struct se_cmd
*cmd
);
73 static int target_get_sess_cmd(struct se_session
*, struct se_cmd
*, bool);
74 static void transport_put_cmd(struct se_cmd
*cmd
);
75 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
76 static void target_complete_ok_work(struct work_struct
*work
);
78 int init_se_kmem_caches(void)
80 se_sess_cache
= kmem_cache_create("se_sess_cache",
81 sizeof(struct se_session
), __alignof__(struct se_session
),
84 pr_err("kmem_cache_create() for struct se_session"
88 se_ua_cache
= kmem_cache_create("se_ua_cache",
89 sizeof(struct se_ua
), __alignof__(struct se_ua
),
92 pr_err("kmem_cache_create() for struct se_ua failed\n");
93 goto out_free_sess_cache
;
95 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
96 sizeof(struct t10_pr_registration
),
97 __alignof__(struct t10_pr_registration
), 0, NULL
);
98 if (!t10_pr_reg_cache
) {
99 pr_err("kmem_cache_create() for struct t10_pr_registration"
101 goto out_free_ua_cache
;
103 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
104 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
106 if (!t10_alua_lu_gp_cache
) {
107 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
109 goto out_free_pr_reg_cache
;
111 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
112 sizeof(struct t10_alua_lu_gp_member
),
113 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
114 if (!t10_alua_lu_gp_mem_cache
) {
115 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
117 goto out_free_lu_gp_cache
;
119 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
120 sizeof(struct t10_alua_tg_pt_gp
),
121 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
122 if (!t10_alua_tg_pt_gp_cache
) {
123 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
125 goto out_free_lu_gp_mem_cache
;
127 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
128 "t10_alua_tg_pt_gp_mem_cache",
129 sizeof(struct t10_alua_tg_pt_gp_member
),
130 __alignof__(struct t10_alua_tg_pt_gp_member
),
132 if (!t10_alua_tg_pt_gp_mem_cache
) {
133 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
135 goto out_free_tg_pt_gp_cache
;
138 target_completion_wq
= alloc_workqueue("target_completion",
140 if (!target_completion_wq
)
141 goto out_free_tg_pt_gp_mem_cache
;
145 out_free_tg_pt_gp_mem_cache
:
146 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
147 out_free_tg_pt_gp_cache
:
148 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
149 out_free_lu_gp_mem_cache
:
150 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
151 out_free_lu_gp_cache
:
152 kmem_cache_destroy(t10_alua_lu_gp_cache
);
153 out_free_pr_reg_cache
:
154 kmem_cache_destroy(t10_pr_reg_cache
);
156 kmem_cache_destroy(se_ua_cache
);
158 kmem_cache_destroy(se_sess_cache
);
163 void release_se_kmem_caches(void)
165 destroy_workqueue(target_completion_wq
);
166 kmem_cache_destroy(se_sess_cache
);
167 kmem_cache_destroy(se_ua_cache
);
168 kmem_cache_destroy(t10_pr_reg_cache
);
169 kmem_cache_destroy(t10_alua_lu_gp_cache
);
170 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
171 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
172 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
175 /* This code ensures unique mib indexes are handed out. */
176 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
177 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
180 * Allocate a new row index for the entry type specified
182 u32
scsi_get_new_index(scsi_index_t type
)
186 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
188 spin_lock(&scsi_mib_index_lock
);
189 new_index
= ++scsi_mib_index
[type
];
190 spin_unlock(&scsi_mib_index_lock
);
195 void transport_subsystem_check_init(void)
199 if (sub_api_initialized
)
202 ret
= request_module("target_core_iblock");
204 pr_err("Unable to load target_core_iblock\n");
206 ret
= request_module("target_core_file");
208 pr_err("Unable to load target_core_file\n");
210 ret
= request_module("target_core_pscsi");
212 pr_err("Unable to load target_core_pscsi\n");
214 ret
= request_module("target_core_stgt");
216 pr_err("Unable to load target_core_stgt\n");
218 sub_api_initialized
= 1;
222 struct se_session
*transport_init_session(void)
224 struct se_session
*se_sess
;
226 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
228 pr_err("Unable to allocate struct se_session from"
230 return ERR_PTR(-ENOMEM
);
232 INIT_LIST_HEAD(&se_sess
->sess_list
);
233 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
234 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
235 spin_lock_init(&se_sess
->sess_cmd_lock
);
236 kref_init(&se_sess
->sess_kref
);
240 EXPORT_SYMBOL(transport_init_session
);
243 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
245 void __transport_register_session(
246 struct se_portal_group
*se_tpg
,
247 struct se_node_acl
*se_nacl
,
248 struct se_session
*se_sess
,
249 void *fabric_sess_ptr
)
251 unsigned char buf
[PR_REG_ISID_LEN
];
253 se_sess
->se_tpg
= se_tpg
;
254 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
256 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
258 * Only set for struct se_session's that will actually be moving I/O.
259 * eg: *NOT* discovery sessions.
263 * If the fabric module supports an ISID based TransportID,
264 * save this value in binary from the fabric I_T Nexus now.
266 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
267 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
268 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
269 &buf
[0], PR_REG_ISID_LEN
);
270 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
272 kref_get(&se_nacl
->acl_kref
);
274 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
276 * The se_nacl->nacl_sess pointer will be set to the
277 * last active I_T Nexus for each struct se_node_acl.
279 se_nacl
->nacl_sess
= se_sess
;
281 list_add_tail(&se_sess
->sess_acl_list
,
282 &se_nacl
->acl_sess_list
);
283 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
285 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
287 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
288 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
290 EXPORT_SYMBOL(__transport_register_session
);
292 void transport_register_session(
293 struct se_portal_group
*se_tpg
,
294 struct se_node_acl
*se_nacl
,
295 struct se_session
*se_sess
,
296 void *fabric_sess_ptr
)
300 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
301 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
302 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
304 EXPORT_SYMBOL(transport_register_session
);
306 void target_release_session(struct kref
*kref
)
308 struct se_session
*se_sess
= container_of(kref
,
309 struct se_session
, sess_kref
);
310 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
312 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
315 void target_get_session(struct se_session
*se_sess
)
317 kref_get(&se_sess
->sess_kref
);
319 EXPORT_SYMBOL(target_get_session
);
321 void target_put_session(struct se_session
*se_sess
)
323 struct se_portal_group
*tpg
= se_sess
->se_tpg
;
325 if (tpg
->se_tpg_tfo
->put_session
!= NULL
) {
326 tpg
->se_tpg_tfo
->put_session(se_sess
);
329 kref_put(&se_sess
->sess_kref
, target_release_session
);
331 EXPORT_SYMBOL(target_put_session
);
333 static void target_complete_nacl(struct kref
*kref
)
335 struct se_node_acl
*nacl
= container_of(kref
,
336 struct se_node_acl
, acl_kref
);
338 complete(&nacl
->acl_free_comp
);
341 void target_put_nacl(struct se_node_acl
*nacl
)
343 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
346 void transport_deregister_session_configfs(struct se_session
*se_sess
)
348 struct se_node_acl
*se_nacl
;
351 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
353 se_nacl
= se_sess
->se_node_acl
;
355 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
356 if (se_nacl
->acl_stop
== 0)
357 list_del(&se_sess
->sess_acl_list
);
359 * If the session list is empty, then clear the pointer.
360 * Otherwise, set the struct se_session pointer from the tail
361 * element of the per struct se_node_acl active session list.
363 if (list_empty(&se_nacl
->acl_sess_list
))
364 se_nacl
->nacl_sess
= NULL
;
366 se_nacl
->nacl_sess
= container_of(
367 se_nacl
->acl_sess_list
.prev
,
368 struct se_session
, sess_acl_list
);
370 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
373 EXPORT_SYMBOL(transport_deregister_session_configfs
);
375 void transport_free_session(struct se_session
*se_sess
)
377 kmem_cache_free(se_sess_cache
, se_sess
);
379 EXPORT_SYMBOL(transport_free_session
);
381 void transport_deregister_session(struct se_session
*se_sess
)
383 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
384 struct target_core_fabric_ops
*se_tfo
;
385 struct se_node_acl
*se_nacl
;
387 bool comp_nacl
= true;
390 transport_free_session(se_sess
);
393 se_tfo
= se_tpg
->se_tpg_tfo
;
395 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
396 list_del(&se_sess
->sess_list
);
397 se_sess
->se_tpg
= NULL
;
398 se_sess
->fabric_sess_ptr
= NULL
;
399 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
402 * Determine if we need to do extra work for this initiator node's
403 * struct se_node_acl if it had been previously dynamically generated.
405 se_nacl
= se_sess
->se_node_acl
;
407 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
408 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
409 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
410 list_del(&se_nacl
->acl_list
);
411 se_tpg
->num_node_acls
--;
412 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_tfo
->tpg_release_fabric_acl(se_tpg
, se_nacl
);
418 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
421 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
423 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
424 se_tpg
->se_tpg_tfo
->get_fabric_name());
426 * If last kref is dropping now for an explict NodeACL, awake sleeping
427 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
430 if (se_nacl
&& comp_nacl
== true)
431 target_put_nacl(se_nacl
);
433 transport_free_session(se_sess
);
435 EXPORT_SYMBOL(transport_deregister_session
);
438 * Called with cmd->t_state_lock held.
440 static void target_remove_from_state_list(struct se_cmd
*cmd
)
442 struct se_device
*dev
= cmd
->se_dev
;
448 if (cmd
->transport_state
& CMD_T_BUSY
)
451 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
452 if (cmd
->state_active
) {
453 list_del(&cmd
->state_list
);
454 cmd
->state_active
= false;
456 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
459 static int transport_cmd_check_stop(struct se_cmd
*cmd
, bool remove_from_lists
)
463 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
465 * Determine if IOCTL context caller in requesting the stopping of this
466 * command for LUN shutdown purposes.
468 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
469 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
470 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
472 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
473 if (remove_from_lists
)
474 target_remove_from_state_list(cmd
);
475 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
477 complete(&cmd
->transport_lun_stop_comp
);
481 if (remove_from_lists
) {
482 target_remove_from_state_list(cmd
);
485 * Clear struct se_cmd->se_lun before the handoff to FE.
491 * Determine if frontend context caller is requesting the stopping of
492 * this command for frontend exceptions.
494 if (cmd
->transport_state
& CMD_T_STOP
) {
495 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
497 cmd
->se_tfo
->get_task_tag(cmd
));
499 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
501 complete(&cmd
->t_transport_stop_comp
);
505 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
506 if (remove_from_lists
) {
508 * Some fabric modules like tcm_loop can release
509 * their internally allocated I/O reference now and
512 * Fabric modules are expected to return '1' here if the
513 * se_cmd being passed is released at this point,
514 * or zero if not being released.
516 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
517 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
518 return cmd
->se_tfo
->check_stop_free(cmd
);
522 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
526 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
528 return transport_cmd_check_stop(cmd
, true);
531 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
533 struct se_lun
*lun
= cmd
->se_lun
;
539 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
540 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
541 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
542 target_remove_from_state_list(cmd
);
544 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
546 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
547 if (!list_empty(&cmd
->se_lun_node
))
548 list_del_init(&cmd
->se_lun_node
);
549 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
552 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
554 if (!(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
555 transport_lun_remove_cmd(cmd
);
557 if (transport_cmd_check_stop_to_fabric(cmd
))
560 transport_put_cmd(cmd
);
563 static void target_complete_failure_work(struct work_struct
*work
)
565 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
567 transport_generic_request_failure(cmd
);
571 * Used when asking transport to copy Sense Data from the underlying
572 * Linux/SCSI struct scsi_cmnd
574 static unsigned char *transport_get_sense_buffer(struct se_cmd
*cmd
)
576 unsigned char *buffer
= cmd
->sense_buffer
;
577 struct se_device
*dev
= cmd
->se_dev
;
580 WARN_ON(!cmd
->se_lun
);
585 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
)
588 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
, TRANSPORT_SENSE_BUFFER
);
590 /* Automatically padded */
591 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
593 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
594 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
595 return &buffer
[offset
];
598 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
600 struct se_device
*dev
= cmd
->se_dev
;
601 int success
= scsi_status
== GOOD
;
604 cmd
->scsi_status
= scsi_status
;
607 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
608 cmd
->transport_state
&= ~CMD_T_BUSY
;
610 if (dev
&& dev
->transport
->transport_complete
) {
611 dev
->transport
->transport_complete(cmd
,
613 transport_get_sense_buffer(cmd
));
614 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
619 * See if we are waiting to complete for an exception condition.
621 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
622 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
623 complete(&cmd
->task_stop_comp
);
628 cmd
->transport_state
|= CMD_T_FAILED
;
631 * Check for case where an explict ABORT_TASK has been received
632 * and transport_wait_for_tasks() will be waiting for completion..
634 if (cmd
->transport_state
& CMD_T_ABORTED
&&
635 cmd
->transport_state
& CMD_T_STOP
) {
636 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
637 complete(&cmd
->t_transport_stop_comp
);
639 } else if (cmd
->transport_state
& CMD_T_FAILED
) {
640 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
641 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
643 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
646 cmd
->t_state
= TRANSPORT_COMPLETE
;
647 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
648 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
650 queue_work(target_completion_wq
, &cmd
->work
);
652 EXPORT_SYMBOL(target_complete_cmd
);
654 static void target_add_to_state_list(struct se_cmd
*cmd
)
656 struct se_device
*dev
= cmd
->se_dev
;
659 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
660 if (!cmd
->state_active
) {
661 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
662 cmd
->state_active
= true;
664 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
668 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
670 static void transport_write_pending_qf(struct se_cmd
*cmd
);
671 static void transport_complete_qf(struct se_cmd
*cmd
);
673 static void target_qf_do_work(struct work_struct
*work
)
675 struct se_device
*dev
= container_of(work
, struct se_device
,
677 LIST_HEAD(qf_cmd_list
);
678 struct se_cmd
*cmd
, *cmd_tmp
;
680 spin_lock_irq(&dev
->qf_cmd_lock
);
681 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
682 spin_unlock_irq(&dev
->qf_cmd_lock
);
684 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
685 list_del(&cmd
->se_qf_node
);
686 atomic_dec(&dev
->dev_qf_count
);
687 smp_mb__after_atomic_dec();
689 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
690 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
691 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
692 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
695 if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
)
696 transport_write_pending_qf(cmd
);
697 else if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
)
698 transport_complete_qf(cmd
);
702 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
704 switch (cmd
->data_direction
) {
707 case DMA_FROM_DEVICE
:
711 case DMA_BIDIRECTIONAL
:
720 void transport_dump_dev_state(
721 struct se_device
*dev
,
725 *bl
+= sprintf(b
+ *bl
, "Status: ");
726 switch (dev
->dev_status
) {
727 case TRANSPORT_DEVICE_ACTIVATED
:
728 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
730 case TRANSPORT_DEVICE_DEACTIVATED
:
731 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
733 case TRANSPORT_DEVICE_SHUTDOWN
:
734 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
736 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
737 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
738 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
741 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
745 *bl
+= sprintf(b
+ *bl
, " Max Queue Depth: %d", dev
->queue_depth
);
746 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u HwMaxSectors: %u\n",
747 dev
->se_sub_dev
->se_dev_attrib
.block_size
,
748 dev
->se_sub_dev
->se_dev_attrib
.hw_max_sectors
);
749 *bl
+= sprintf(b
+ *bl
, " ");
752 void transport_dump_vpd_proto_id(
754 unsigned char *p_buf
,
757 unsigned char buf
[VPD_TMP_BUF_SIZE
];
760 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
761 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
763 switch (vpd
->protocol_identifier
) {
765 sprintf(buf
+len
, "Fibre Channel\n");
768 sprintf(buf
+len
, "Parallel SCSI\n");
771 sprintf(buf
+len
, "SSA\n");
774 sprintf(buf
+len
, "IEEE 1394\n");
777 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
781 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
784 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
787 sprintf(buf
+len
, "Automation/Drive Interface Transport"
791 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
794 sprintf(buf
+len
, "Unknown 0x%02x\n",
795 vpd
->protocol_identifier
);
800 strncpy(p_buf
, buf
, p_buf_len
);
806 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
809 * Check if the Protocol Identifier Valid (PIV) bit is set..
811 * from spc3r23.pdf section 7.5.1
813 if (page_83
[1] & 0x80) {
814 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
815 vpd
->protocol_identifier_set
= 1;
816 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
819 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
821 int transport_dump_vpd_assoc(
823 unsigned char *p_buf
,
826 unsigned char buf
[VPD_TMP_BUF_SIZE
];
830 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
831 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
833 switch (vpd
->association
) {
835 sprintf(buf
+len
, "addressed logical unit\n");
838 sprintf(buf
+len
, "target port\n");
841 sprintf(buf
+len
, "SCSI target device\n");
844 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
850 strncpy(p_buf
, buf
, p_buf_len
);
857 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
860 * The VPD identification association..
862 * from spc3r23.pdf Section 7.6.3.1 Table 297
864 vpd
->association
= (page_83
[1] & 0x30);
865 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
867 EXPORT_SYMBOL(transport_set_vpd_assoc
);
869 int transport_dump_vpd_ident_type(
871 unsigned char *p_buf
,
874 unsigned char buf
[VPD_TMP_BUF_SIZE
];
878 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
879 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
881 switch (vpd
->device_identifier_type
) {
883 sprintf(buf
+len
, "Vendor specific\n");
886 sprintf(buf
+len
, "T10 Vendor ID based\n");
889 sprintf(buf
+len
, "EUI-64 based\n");
892 sprintf(buf
+len
, "NAA\n");
895 sprintf(buf
+len
, "Relative target port identifier\n");
898 sprintf(buf
+len
, "SCSI name string\n");
901 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
902 vpd
->device_identifier_type
);
908 if (p_buf_len
< strlen(buf
)+1)
910 strncpy(p_buf
, buf
, p_buf_len
);
918 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
921 * The VPD identifier type..
923 * from spc3r23.pdf Section 7.6.3.1 Table 298
925 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
926 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
928 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
930 int transport_dump_vpd_ident(
932 unsigned char *p_buf
,
935 unsigned char buf
[VPD_TMP_BUF_SIZE
];
938 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
940 switch (vpd
->device_identifier_code_set
) {
941 case 0x01: /* Binary */
942 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
943 &vpd
->device_identifier
[0]);
945 case 0x02: /* ASCII */
946 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
947 &vpd
->device_identifier
[0]);
949 case 0x03: /* UTF-8 */
950 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
951 &vpd
->device_identifier
[0]);
954 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
955 " 0x%02x", vpd
->device_identifier_code_set
);
961 strncpy(p_buf
, buf
, p_buf_len
);
969 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
971 static const char hex_str
[] = "0123456789abcdef";
972 int j
= 0, i
= 4; /* offset to start of the identifer */
975 * The VPD Code Set (encoding)
977 * from spc3r23.pdf Section 7.6.3.1 Table 296
979 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
980 switch (vpd
->device_identifier_code_set
) {
981 case 0x01: /* Binary */
982 vpd
->device_identifier
[j
++] =
983 hex_str
[vpd
->device_identifier_type
];
984 while (i
< (4 + page_83
[3])) {
985 vpd
->device_identifier
[j
++] =
986 hex_str
[(page_83
[i
] & 0xf0) >> 4];
987 vpd
->device_identifier
[j
++] =
988 hex_str
[page_83
[i
] & 0x0f];
992 case 0x02: /* ASCII */
993 case 0x03: /* UTF-8 */
994 while (i
< (4 + page_83
[3]))
995 vpd
->device_identifier
[j
++] = page_83
[i
++];
1001 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1003 EXPORT_SYMBOL(transport_set_vpd_ident
);
1005 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1008 * If this device is from Target_Core_Mod/pSCSI, disable the
1009 * SAM Task Attribute emulation.
1011 * This is currently not available in upsream Linux/SCSI Target
1012 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1014 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1015 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1019 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1020 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1021 " device\n", dev
->transport
->name
,
1022 dev
->transport
->get_device_rev(dev
));
1025 static void scsi_dump_inquiry(struct se_device
*dev
)
1027 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1031 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1033 for (i
= 0; i
< 8; i
++)
1034 if (wwn
->vendor
[i
] >= 0x20)
1035 buf
[i
] = wwn
->vendor
[i
];
1039 pr_debug(" Vendor: %s\n", buf
);
1041 for (i
= 0; i
< 16; i
++)
1042 if (wwn
->model
[i
] >= 0x20)
1043 buf
[i
] = wwn
->model
[i
];
1047 pr_debug(" Model: %s\n", buf
);
1049 for (i
= 0; i
< 4; i
++)
1050 if (wwn
->revision
[i
] >= 0x20)
1051 buf
[i
] = wwn
->revision
[i
];
1055 pr_debug(" Revision: %s\n", buf
);
1057 device_type
= dev
->transport
->get_device_type(dev
);
1058 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1059 pr_debug(" ANSI SCSI revision: %02x\n",
1060 dev
->transport
->get_device_rev(dev
));
1063 struct se_device
*transport_add_device_to_core_hba(
1065 struct se_subsystem_api
*transport
,
1066 struct se_subsystem_dev
*se_dev
,
1068 void *transport_dev
,
1069 struct se_dev_limits
*dev_limits
,
1070 const char *inquiry_prod
,
1071 const char *inquiry_rev
)
1074 struct se_device
*dev
;
1076 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1078 pr_err("Unable to allocate memory for se_dev_t\n");
1082 dev
->dev_flags
= device_flags
;
1083 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1084 dev
->dev_ptr
= transport_dev
;
1086 dev
->se_sub_dev
= se_dev
;
1087 dev
->transport
= transport
;
1088 INIT_LIST_HEAD(&dev
->dev_list
);
1089 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1090 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1091 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1092 INIT_LIST_HEAD(&dev
->state_list
);
1093 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1094 spin_lock_init(&dev
->execute_task_lock
);
1095 spin_lock_init(&dev
->delayed_cmd_lock
);
1096 spin_lock_init(&dev
->dev_reservation_lock
);
1097 spin_lock_init(&dev
->dev_status_lock
);
1098 spin_lock_init(&dev
->se_port_lock
);
1099 spin_lock_init(&dev
->se_tmr_lock
);
1100 spin_lock_init(&dev
->qf_cmd_lock
);
1101 atomic_set(&dev
->dev_ordered_id
, 0);
1103 se_dev_set_default_attribs(dev
, dev_limits
);
1105 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1106 dev
->creation_time
= get_jiffies_64();
1107 spin_lock_init(&dev
->stats_lock
);
1109 spin_lock(&hba
->device_lock
);
1110 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1112 spin_unlock(&hba
->device_lock
);
1114 * Setup the SAM Task Attribute emulation for struct se_device
1116 core_setup_task_attr_emulation(dev
);
1118 * Force PR and ALUA passthrough emulation with internal object use.
1120 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1122 * Setup the Reservations infrastructure for struct se_device
1124 core_setup_reservations(dev
, force_pt
);
1126 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1128 if (core_setup_alua(dev
, force_pt
) < 0)
1132 * Startup the struct se_device processing thread
1134 dev
->tmr_wq
= alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1,
1135 dev
->transport
->name
);
1137 pr_err("Unable to create tmr workqueue for %s\n",
1138 dev
->transport
->name
);
1142 * Setup work_queue for QUEUE_FULL
1144 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1146 * Preload the initial INQUIRY const values if we are doing
1147 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1148 * passthrough because this is being provided by the backend LLD.
1149 * This is required so that transport_get_inquiry() copies these
1150 * originals once back into DEV_T10_WWN(dev) for the virtual device
1153 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1154 if (!inquiry_prod
|| !inquiry_rev
) {
1155 pr_err("All non TCM/pSCSI plugins require"
1156 " INQUIRY consts\n");
1160 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1161 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1162 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1164 scsi_dump_inquiry(dev
);
1169 destroy_workqueue(dev
->tmr_wq
);
1171 spin_lock(&hba
->device_lock
);
1172 list_del(&dev
->dev_list
);
1174 spin_unlock(&hba
->device_lock
);
1176 se_release_vpd_for_dev(dev
);
1182 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1184 int target_cmd_size_check(struct se_cmd
*cmd
, unsigned int size
)
1186 struct se_device
*dev
= cmd
->se_dev
;
1188 if (cmd
->unknown_data_length
) {
1189 cmd
->data_length
= size
;
1190 } else if (size
!= cmd
->data_length
) {
1191 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1192 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1193 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
1194 cmd
->data_length
, size
, cmd
->t_task_cdb
[0]);
1196 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
1197 pr_err("Rejecting underflow/overflow"
1199 goto out_invalid_cdb_field
;
1202 * Reject READ_* or WRITE_* with overflow/underflow for
1203 * type SCF_SCSI_DATA_CDB.
1205 if (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512) {
1206 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1207 " CDB on non 512-byte sector setup subsystem"
1208 " plugin: %s\n", dev
->transport
->name
);
1209 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1210 goto out_invalid_cdb_field
;
1213 * For the overflow case keep the existing fabric provided
1214 * ->data_length. Otherwise for the underflow case, reset
1215 * ->data_length to the smaller SCSI expected data transfer
1218 if (size
> cmd
->data_length
) {
1219 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
1220 cmd
->residual_count
= (size
- cmd
->data_length
);
1222 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
1223 cmd
->residual_count
= (cmd
->data_length
- size
);
1224 cmd
->data_length
= size
;
1230 out_invalid_cdb_field
:
1231 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1232 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1237 * Used by fabric modules containing a local struct se_cmd within their
1238 * fabric dependent per I/O descriptor.
1240 void transport_init_se_cmd(
1242 struct target_core_fabric_ops
*tfo
,
1243 struct se_session
*se_sess
,
1247 unsigned char *sense_buffer
)
1249 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1250 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1251 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1252 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1253 INIT_LIST_HEAD(&cmd
->state_list
);
1254 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1255 init_completion(&cmd
->transport_lun_stop_comp
);
1256 init_completion(&cmd
->t_transport_stop_comp
);
1257 init_completion(&cmd
->cmd_wait_comp
);
1258 init_completion(&cmd
->task_stop_comp
);
1259 spin_lock_init(&cmd
->t_state_lock
);
1260 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1263 cmd
->se_sess
= se_sess
;
1264 cmd
->data_length
= data_length
;
1265 cmd
->data_direction
= data_direction
;
1266 cmd
->sam_task_attr
= task_attr
;
1267 cmd
->sense_buffer
= sense_buffer
;
1269 cmd
->state_active
= false;
1271 EXPORT_SYMBOL(transport_init_se_cmd
);
1273 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1276 * Check if SAM Task Attribute emulation is enabled for this
1277 * struct se_device storage object
1279 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1282 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1283 pr_debug("SAM Task Attribute ACA"
1284 " emulation is not supported\n");
1288 * Used to determine when ORDERED commands should go from
1289 * Dormant to Active status.
1291 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1292 smp_mb__after_atomic_inc();
1293 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1294 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1295 cmd
->se_dev
->transport
->name
);
1299 /* target_setup_cmd_from_cdb():
1301 * Called from fabric RX Thread.
1303 int target_setup_cmd_from_cdb(
1307 struct se_subsystem_dev
*su_dev
= cmd
->se_dev
->se_sub_dev
;
1308 u32 pr_reg_type
= 0;
1310 unsigned long flags
;
1314 * Ensure that the received CDB is less than the max (252 + 8) bytes
1315 * for VARIABLE_LENGTH_CMD
1317 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1318 pr_err("Received SCSI CDB with command_size: %d that"
1319 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1320 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1321 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1322 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1326 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1327 * allocate the additional extended CDB buffer now.. Otherwise
1328 * setup the pointer from __t_task_cdb to t_task_cdb.
1330 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1331 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1333 if (!cmd
->t_task_cdb
) {
1334 pr_err("Unable to allocate cmd->t_task_cdb"
1335 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1336 scsi_command_size(cdb
),
1337 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1338 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1339 cmd
->scsi_sense_reason
=
1340 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1344 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1346 * Copy the original CDB into cmd->
1348 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1351 * Check for an existing UNIT ATTENTION condition
1353 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
1354 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1355 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
1359 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
1362 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1363 * The ALUA additional sense code qualifier (ASCQ) is determined
1364 * by the ALUA primary or secondary access state..
1367 pr_debug("[%s]: ALUA TG Port not available, "
1368 "SenseKey: NOT_READY, ASC/ASCQ: "
1370 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
1372 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
1373 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1374 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
1377 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1378 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1383 * Check status for SPC-3 Persistent Reservations
1385 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
)) {
1386 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
1387 cmd
, cdb
, pr_reg_type
) != 0) {
1388 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1389 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
1390 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1391 cmd
->scsi_sense_reason
= TCM_RESERVATION_CONFLICT
;
1395 * This means the CDB is allowed for the SCSI Initiator port
1396 * when said port is *NOT* holding the legacy SPC-2 or
1397 * SPC-3 Persistent Reservation.
1401 ret
= cmd
->se_dev
->transport
->parse_cdb(cmd
);
1405 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1406 cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1407 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1410 * Check for SAM Task Attribute Emulation
1412 if (transport_check_alloc_task_attr(cmd
) < 0) {
1413 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1414 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1417 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1418 if (cmd
->se_lun
->lun_sep
)
1419 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1420 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1423 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1426 * Used by fabric module frontends to queue tasks directly.
1427 * Many only be used from process context only
1429 int transport_handle_cdb_direct(
1436 pr_err("cmd->se_lun is NULL\n");
1439 if (in_interrupt()) {
1441 pr_err("transport_generic_handle_cdb cannot be called"
1442 " from interrupt context\n");
1446 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1447 * outstanding descriptors are handled correctly during shutdown via
1448 * transport_wait_for_tasks()
1450 * Also, we don't take cmd->t_state_lock here as we only expect
1451 * this to be called for initial descriptor submission.
1453 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1454 cmd
->transport_state
|= CMD_T_ACTIVE
;
1457 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1458 * so follow TRANSPORT_NEW_CMD processing thread context usage
1459 * and call transport_generic_request_failure() if necessary..
1461 ret
= transport_generic_new_cmd(cmd
);
1463 transport_generic_request_failure(cmd
);
1467 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1470 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1472 * @se_cmd: command descriptor to submit
1473 * @se_sess: associated se_sess for endpoint
1474 * @cdb: pointer to SCSI CDB
1475 * @sense: pointer to SCSI sense buffer
1476 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1477 * @data_length: fabric expected data transfer length
1478 * @task_addr: SAM task attribute
1479 * @data_dir: DMA data direction
1480 * @flags: flags for command submission from target_sc_flags_tables
1482 * Returns non zero to signal active I/O shutdown failure. All other
1483 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1484 * but still return zero here.
1486 * This may only be called from process context, and also currently
1487 * assumes internal allocation of fabric payload buffer by target-core.
1489 int target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1490 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1491 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1493 struct se_portal_group
*se_tpg
;
1496 se_tpg
= se_sess
->se_tpg
;
1498 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1499 BUG_ON(in_interrupt());
1501 * Initialize se_cmd for target operation. From this point
1502 * exceptions are handled by sending exception status via
1503 * target_core_fabric_ops->queue_status() callback
1505 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1506 data_length
, data_dir
, task_attr
, sense
);
1507 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1508 se_cmd
->unknown_data_length
= 1;
1510 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1511 * se_sess->sess_cmd_list. A second kref_get here is necessary
1512 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1513 * kref_put() to happen during fabric packet acknowledgement.
1515 rc
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1519 * Signal bidirectional data payloads to target-core
1521 if (flags
& TARGET_SCF_BIDI_OP
)
1522 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1524 * Locate se_lun pointer and attach it to struct se_cmd
1526 if (transport_lookup_cmd_lun(se_cmd
, unpacked_lun
) < 0) {
1527 transport_send_check_condition_and_sense(se_cmd
,
1528 se_cmd
->scsi_sense_reason
, 0);
1529 target_put_sess_cmd(se_sess
, se_cmd
);
1533 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1535 transport_generic_request_failure(se_cmd
);
1540 * Check if we need to delay processing because of ALUA
1541 * Active/NonOptimized primary access state..
1543 core_alua_check_nonop_delay(se_cmd
);
1545 transport_handle_cdb_direct(se_cmd
);
1548 EXPORT_SYMBOL(target_submit_cmd
);
1550 static void target_complete_tmr_failure(struct work_struct
*work
)
1552 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1554 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1555 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1556 transport_generic_free_cmd(se_cmd
, 0);
1560 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1563 * @se_cmd: command descriptor to submit
1564 * @se_sess: associated se_sess for endpoint
1565 * @sense: pointer to SCSI sense buffer
1566 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1567 * @fabric_context: fabric context for TMR req
1568 * @tm_type: Type of TM request
1569 * @gfp: gfp type for caller
1570 * @tag: referenced task tag for TMR_ABORT_TASK
1571 * @flags: submit cmd flags
1573 * Callable from all contexts.
1576 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1577 unsigned char *sense
, u32 unpacked_lun
,
1578 void *fabric_tmr_ptr
, unsigned char tm_type
,
1579 gfp_t gfp
, unsigned int tag
, int flags
)
1581 struct se_portal_group
*se_tpg
;
1584 se_tpg
= se_sess
->se_tpg
;
1587 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1588 0, DMA_NONE
, MSG_SIMPLE_TAG
, sense
);
1590 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1591 * allocation failure.
1593 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1597 if (tm_type
== TMR_ABORT_TASK
)
1598 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1600 /* See target_submit_cmd for commentary */
1601 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1603 core_tmr_release_req(se_cmd
->se_tmr_req
);
1607 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1610 * For callback during failure handling, push this work off
1611 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1613 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1614 schedule_work(&se_cmd
->work
);
1617 transport_generic_handle_tmr(se_cmd
);
1620 EXPORT_SYMBOL(target_submit_tmr
);
1623 * If the cmd is active, request it to be stopped and sleep until it
1626 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1628 bool was_active
= false;
1630 if (cmd
->transport_state
& CMD_T_BUSY
) {
1631 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1632 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1634 pr_debug("cmd %p waiting to complete\n", cmd
);
1635 wait_for_completion(&cmd
->task_stop_comp
);
1636 pr_debug("cmd %p stopped successfully\n", cmd
);
1638 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1639 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1640 cmd
->transport_state
&= ~CMD_T_BUSY
;
1648 * Handle SAM-esque emulation for generic transport request failures.
1650 void transport_generic_request_failure(struct se_cmd
*cmd
)
1654 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1655 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1656 cmd
->t_task_cdb
[0]);
1657 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1658 cmd
->se_tfo
->get_cmd_state(cmd
),
1659 cmd
->t_state
, cmd
->scsi_sense_reason
);
1660 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1661 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1662 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1663 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1666 * For SAM Task Attribute emulation for failed struct se_cmd
1668 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1669 transport_complete_task_attr(cmd
);
1671 switch (cmd
->scsi_sense_reason
) {
1672 case TCM_NON_EXISTENT_LUN
:
1673 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1674 case TCM_INVALID_CDB_FIELD
:
1675 case TCM_INVALID_PARAMETER_LIST
:
1676 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1677 case TCM_UNKNOWN_MODE_PAGE
:
1678 case TCM_WRITE_PROTECTED
:
1679 case TCM_ADDRESS_OUT_OF_RANGE
:
1680 case TCM_CHECK_CONDITION_ABORT_CMD
:
1681 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1682 case TCM_CHECK_CONDITION_NOT_READY
:
1684 case TCM_RESERVATION_CONFLICT
:
1686 * No SENSE Data payload for this case, set SCSI Status
1687 * and queue the response to $FABRIC_MOD.
1689 * Uses linux/include/scsi/scsi.h SAM status codes defs
1691 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1693 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1694 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1697 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1700 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1701 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1702 cmd
->orig_fe_lun
, 0x2C,
1703 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1705 ret
= cmd
->se_tfo
->queue_status(cmd
);
1706 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1710 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1711 cmd
->t_task_cdb
[0], cmd
->scsi_sense_reason
);
1712 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1716 ret
= transport_send_check_condition_and_sense(cmd
,
1717 cmd
->scsi_sense_reason
, 0);
1718 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1722 transport_lun_remove_cmd(cmd
);
1723 if (!transport_cmd_check_stop_to_fabric(cmd
))
1728 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1729 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1731 EXPORT_SYMBOL(transport_generic_request_failure
);
1733 static void __target_execute_cmd(struct se_cmd
*cmd
)
1737 spin_lock_irq(&cmd
->t_state_lock
);
1738 cmd
->transport_state
|= (CMD_T_BUSY
|CMD_T_SENT
);
1739 spin_unlock_irq(&cmd
->t_state_lock
);
1741 if (cmd
->execute_cmd
)
1742 error
= cmd
->execute_cmd(cmd
);
1745 spin_lock_irq(&cmd
->t_state_lock
);
1746 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1747 spin_unlock_irq(&cmd
->t_state_lock
);
1749 transport_generic_request_failure(cmd
);
1753 void target_execute_cmd(struct se_cmd
*cmd
)
1755 struct se_device
*dev
= cmd
->se_dev
;
1758 * If the received CDB has aleady been aborted stop processing it here.
1760 if (transport_check_aborted_status(cmd
, 1))
1764 * Determine if IOCTL context caller in requesting the stopping of this
1765 * command for LUN shutdown purposes.
1767 spin_lock_irq(&cmd
->t_state_lock
);
1768 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
1769 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1770 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
1772 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
1773 spin_unlock_irq(&cmd
->t_state_lock
);
1774 complete(&cmd
->transport_lun_stop_comp
);
1778 * Determine if frontend context caller is requesting the stopping of
1779 * this command for frontend exceptions.
1781 if (cmd
->transport_state
& CMD_T_STOP
) {
1782 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1784 cmd
->se_tfo
->get_task_tag(cmd
));
1786 spin_unlock_irq(&cmd
->t_state_lock
);
1787 complete(&cmd
->t_transport_stop_comp
);
1791 cmd
->t_state
= TRANSPORT_PROCESSING
;
1792 spin_unlock_irq(&cmd
->t_state_lock
);
1794 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1798 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1799 * to allow the passed struct se_cmd list of tasks to the front of the list.
1801 switch (cmd
->sam_task_attr
) {
1803 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1804 "se_ordered_id: %u\n",
1805 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1807 case MSG_ORDERED_TAG
:
1808 atomic_inc(&dev
->dev_ordered_sync
);
1809 smp_mb__after_atomic_inc();
1811 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1812 " se_ordered_id: %u\n",
1813 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1816 * Execute an ORDERED command if no other older commands
1817 * exist that need to be completed first.
1819 if (!atomic_read(&dev
->simple_cmds
))
1824 * For SIMPLE and UNTAGGED Task Attribute commands
1826 atomic_inc(&dev
->simple_cmds
);
1827 smp_mb__after_atomic_inc();
1831 if (atomic_read(&dev
->dev_ordered_sync
) != 0) {
1832 spin_lock(&dev
->delayed_cmd_lock
);
1833 list_add_tail(&cmd
->se_delayed_node
, &dev
->delayed_cmd_list
);
1834 spin_unlock(&dev
->delayed_cmd_lock
);
1836 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1837 " delayed CMD list, se_ordered_id: %u\n",
1838 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1839 cmd
->se_ordered_id
);
1845 * Otherwise, no ORDERED task attributes exist..
1847 __target_execute_cmd(cmd
);
1849 EXPORT_SYMBOL(target_execute_cmd
);
1852 * Process all commands up to the last received ORDERED task attribute which
1853 * requires another blocking boundary
1855 static void target_restart_delayed_cmds(struct se_device
*dev
)
1860 spin_lock(&dev
->delayed_cmd_lock
);
1861 if (list_empty(&dev
->delayed_cmd_list
)) {
1862 spin_unlock(&dev
->delayed_cmd_lock
);
1866 cmd
= list_entry(dev
->delayed_cmd_list
.next
,
1867 struct se_cmd
, se_delayed_node
);
1868 list_del(&cmd
->se_delayed_node
);
1869 spin_unlock(&dev
->delayed_cmd_lock
);
1871 __target_execute_cmd(cmd
);
1873 if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
)
1879 * Called from I/O completion to determine which dormant/delayed
1880 * and ordered cmds need to have their tasks added to the execution queue.
1882 static void transport_complete_task_attr(struct se_cmd
*cmd
)
1884 struct se_device
*dev
= cmd
->se_dev
;
1886 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
1887 atomic_dec(&dev
->simple_cmds
);
1888 smp_mb__after_atomic_dec();
1889 dev
->dev_cur_ordered_id
++;
1890 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1891 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
1892 cmd
->se_ordered_id
);
1893 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1894 dev
->dev_cur_ordered_id
++;
1895 pr_debug("Incremented dev_cur_ordered_id: %u for"
1896 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
1897 cmd
->se_ordered_id
);
1898 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1899 atomic_dec(&dev
->dev_ordered_sync
);
1900 smp_mb__after_atomic_dec();
1902 dev
->dev_cur_ordered_id
++;
1903 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1904 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
1907 target_restart_delayed_cmds(dev
);
1910 static void transport_complete_qf(struct se_cmd
*cmd
)
1914 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1915 transport_complete_task_attr(cmd
);
1917 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1918 ret
= cmd
->se_tfo
->queue_status(cmd
);
1923 switch (cmd
->data_direction
) {
1924 case DMA_FROM_DEVICE
:
1925 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1928 if (cmd
->t_bidi_data_sg
) {
1929 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1933 /* Fall through for DMA_TO_DEVICE */
1935 ret
= cmd
->se_tfo
->queue_status(cmd
);
1943 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1946 transport_lun_remove_cmd(cmd
);
1947 transport_cmd_check_stop_to_fabric(cmd
);
1950 static void transport_handle_queue_full(
1952 struct se_device
*dev
)
1954 spin_lock_irq(&dev
->qf_cmd_lock
);
1955 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
1956 atomic_inc(&dev
->dev_qf_count
);
1957 smp_mb__after_atomic_inc();
1958 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
1960 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1963 static void target_complete_ok_work(struct work_struct
*work
)
1965 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
1969 * Check if we need to move delayed/dormant tasks from cmds on the
1970 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1973 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1974 transport_complete_task_attr(cmd
);
1976 * Check to schedule QUEUE_FULL work, or execute an existing
1977 * cmd->transport_qf_callback()
1979 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
1980 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1983 * Check if we need to send a sense buffer from
1984 * the struct se_cmd in question.
1986 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1987 WARN_ON(!cmd
->scsi_status
);
1988 ret
= transport_send_check_condition_and_sense(
1990 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1993 transport_lun_remove_cmd(cmd
);
1994 transport_cmd_check_stop_to_fabric(cmd
);
1998 * Check for a callback, used by amongst other things
1999 * XDWRITE_READ_10 emulation.
2001 if (cmd
->transport_complete_callback
)
2002 cmd
->transport_complete_callback(cmd
);
2004 switch (cmd
->data_direction
) {
2005 case DMA_FROM_DEVICE
:
2006 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2007 if (cmd
->se_lun
->lun_sep
) {
2008 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
2011 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2013 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2014 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2018 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2019 if (cmd
->se_lun
->lun_sep
) {
2020 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
2023 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2025 * Check if we need to send READ payload for BIDI-COMMAND
2027 if (cmd
->t_bidi_data_sg
) {
2028 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2029 if (cmd
->se_lun
->lun_sep
) {
2030 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
2033 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2034 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2035 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2039 /* Fall through for DMA_TO_DEVICE */
2041 ret
= cmd
->se_tfo
->queue_status(cmd
);
2042 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2049 transport_lun_remove_cmd(cmd
);
2050 transport_cmd_check_stop_to_fabric(cmd
);
2054 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2055 " data_direction: %d\n", cmd
, cmd
->data_direction
);
2056 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
2057 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2060 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
2062 struct scatterlist
*sg
;
2065 for_each_sg(sgl
, sg
, nents
, count
)
2066 __free_page(sg_page(sg
));
2071 static inline void transport_free_pages(struct se_cmd
*cmd
)
2073 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
2076 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
2077 cmd
->t_data_sg
= NULL
;
2078 cmd
->t_data_nents
= 0;
2080 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
2081 cmd
->t_bidi_data_sg
= NULL
;
2082 cmd
->t_bidi_data_nents
= 0;
2086 * transport_release_cmd - free a command
2087 * @cmd: command to free
2089 * This routine unconditionally frees a command, and reference counting
2090 * or list removal must be done in the caller.
2092 static void transport_release_cmd(struct se_cmd
*cmd
)
2094 BUG_ON(!cmd
->se_tfo
);
2096 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
2097 core_tmr_release_req(cmd
->se_tmr_req
);
2098 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
2099 kfree(cmd
->t_task_cdb
);
2101 * If this cmd has been setup with target_get_sess_cmd(), drop
2102 * the kref and call ->release_cmd() in kref callback.
2104 if (cmd
->check_release
!= 0) {
2105 target_put_sess_cmd(cmd
->se_sess
, cmd
);
2108 cmd
->se_tfo
->release_cmd(cmd
);
2112 * transport_put_cmd - release a reference to a command
2113 * @cmd: command to release
2115 * This routine releases our reference to the command and frees it if possible.
2117 static void transport_put_cmd(struct se_cmd
*cmd
)
2119 unsigned long flags
;
2121 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2122 if (atomic_read(&cmd
->t_fe_count
)) {
2123 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
2127 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
2128 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
2129 target_remove_from_state_list(cmd
);
2131 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2133 transport_free_pages(cmd
);
2134 transport_release_cmd(cmd
);
2137 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2141 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2142 * allocating in the core.
2143 * @cmd: Associated se_cmd descriptor
2144 * @mem: SGL style memory for TCM WRITE / READ
2145 * @sg_mem_num: Number of SGL elements
2146 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2147 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2149 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2152 int transport_generic_map_mem_to_cmd(
2154 struct scatterlist
*sgl
,
2156 struct scatterlist
*sgl_bidi
,
2159 if (!sgl
|| !sgl_count
)
2163 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2164 * scatterlists already have been set to follow what the fabric
2165 * passes for the original expected data transfer length.
2167 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2168 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2169 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2170 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2171 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
2175 cmd
->t_data_sg
= sgl
;
2176 cmd
->t_data_nents
= sgl_count
;
2178 if (sgl_bidi
&& sgl_bidi_count
) {
2179 cmd
->t_bidi_data_sg
= sgl_bidi
;
2180 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
2182 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
2185 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
2187 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
2189 struct scatterlist
*sg
= cmd
->t_data_sg
;
2190 struct page
**pages
;
2194 * We need to take into account a possible offset here for fabrics like
2195 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2196 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2198 if (!cmd
->t_data_nents
)
2202 if (cmd
->t_data_nents
== 1)
2203 return kmap(sg_page(sg
)) + sg
->offset
;
2205 /* >1 page. use vmap */
2206 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
2208 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2212 /* convert sg[] to pages[] */
2213 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
2214 pages
[i
] = sg_page(sg
);
2217 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
2219 if (!cmd
->t_data_vmap
) {
2220 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2224 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
2226 EXPORT_SYMBOL(transport_kmap_data_sg
);
2228 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
2230 if (!cmd
->t_data_nents
) {
2232 } else if (cmd
->t_data_nents
== 1) {
2233 kunmap(sg_page(cmd
->t_data_sg
));
2237 vunmap(cmd
->t_data_vmap
);
2238 cmd
->t_data_vmap
= NULL
;
2240 EXPORT_SYMBOL(transport_kunmap_data_sg
);
2243 transport_generic_get_mem(struct se_cmd
*cmd
)
2245 u32 length
= cmd
->data_length
;
2251 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
2252 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
2253 if (!cmd
->t_data_sg
)
2256 cmd
->t_data_nents
= nents
;
2257 sg_init_table(cmd
->t_data_sg
, nents
);
2259 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
? 0 : __GFP_ZERO
;
2262 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
2263 page
= alloc_page(GFP_KERNEL
| zero_flag
);
2267 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
2276 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
2278 kfree(cmd
->t_data_sg
);
2279 cmd
->t_data_sg
= NULL
;
2284 * Allocate any required resources to execute the command. For writes we
2285 * might not have the payload yet, so notify the fabric via a call to
2286 * ->write_pending instead. Otherwise place it on the execution queue.
2288 int transport_generic_new_cmd(struct se_cmd
*cmd
)
2293 * Determine is the TCM fabric module has already allocated physical
2294 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2297 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
2299 ret
= transport_generic_get_mem(cmd
);
2304 * If this command doesn't have any payload and we don't have to call
2305 * into the fabric for data transfers, go ahead and complete it right
2308 if (!cmd
->data_length
&&
2309 cmd
->t_task_cdb
[0] != REQUEST_SENSE
&&
2310 cmd
->se_dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
2311 spin_lock_irq(&cmd
->t_state_lock
);
2312 cmd
->t_state
= TRANSPORT_COMPLETE
;
2313 cmd
->transport_state
|= CMD_T_ACTIVE
;
2314 spin_unlock_irq(&cmd
->t_state_lock
);
2316 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
2317 queue_work(target_completion_wq
, &cmd
->work
);
2321 atomic_inc(&cmd
->t_fe_count
);
2324 * If this command is not a write we can execute it right here,
2325 * for write buffers we need to notify the fabric driver first
2326 * and let it call back once the write buffers are ready.
2328 target_add_to_state_list(cmd
);
2329 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
2330 target_execute_cmd(cmd
);
2334 spin_lock_irq(&cmd
->t_state_lock
);
2335 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
2336 spin_unlock_irq(&cmd
->t_state_lock
);
2338 transport_cmd_check_stop(cmd
, false);
2340 ret
= cmd
->se_tfo
->write_pending(cmd
);
2341 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2349 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2350 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2353 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
2354 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
2355 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2358 EXPORT_SYMBOL(transport_generic_new_cmd
);
2360 static void transport_write_pending_qf(struct se_cmd
*cmd
)
2364 ret
= cmd
->se_tfo
->write_pending(cmd
);
2365 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
2366 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2368 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2372 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
2374 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
2375 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
2376 transport_wait_for_tasks(cmd
);
2378 transport_release_cmd(cmd
);
2381 transport_wait_for_tasks(cmd
);
2383 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
2386 transport_lun_remove_cmd(cmd
);
2388 transport_put_cmd(cmd
);
2391 EXPORT_SYMBOL(transport_generic_free_cmd
);
2393 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2394 * @se_sess: session to reference
2395 * @se_cmd: command descriptor to add
2396 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2398 static int target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
2401 unsigned long flags
;
2404 kref_init(&se_cmd
->cmd_kref
);
2406 * Add a second kref if the fabric caller is expecting to handle
2407 * fabric acknowledgement that requires two target_put_sess_cmd()
2408 * invocations before se_cmd descriptor release.
2410 if (ack_kref
== true) {
2411 kref_get(&se_cmd
->cmd_kref
);
2412 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
2415 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2416 if (se_sess
->sess_tearing_down
) {
2420 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
2421 se_cmd
->check_release
= 1;
2424 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2428 static void target_release_cmd_kref(struct kref
*kref
)
2430 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
2431 struct se_session
*se_sess
= se_cmd
->se_sess
;
2432 unsigned long flags
;
2434 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2435 if (list_empty(&se_cmd
->se_cmd_list
)) {
2436 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2437 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2440 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
2441 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2442 complete(&se_cmd
->cmd_wait_comp
);
2445 list_del(&se_cmd
->se_cmd_list
);
2446 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2448 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2451 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2452 * @se_sess: session to reference
2453 * @se_cmd: command descriptor to drop
2455 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
2457 return kref_put(&se_cmd
->cmd_kref
, target_release_cmd_kref
);
2459 EXPORT_SYMBOL(target_put_sess_cmd
);
2461 /* target_sess_cmd_list_set_waiting - Flag all commands in
2462 * sess_cmd_list to complete cmd_wait_comp. Set
2463 * sess_tearing_down so no more commands are queued.
2464 * @se_sess: session to flag
2466 void target_sess_cmd_list_set_waiting(struct se_session
*se_sess
)
2468 struct se_cmd
*se_cmd
;
2469 unsigned long flags
;
2471 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2473 WARN_ON(se_sess
->sess_tearing_down
);
2474 se_sess
->sess_tearing_down
= 1;
2476 list_for_each_entry(se_cmd
, &se_sess
->sess_cmd_list
, se_cmd_list
)
2477 se_cmd
->cmd_wait_set
= 1;
2479 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2481 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting
);
2483 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2484 * @se_sess: session to wait for active I/O
2485 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2487 void target_wait_for_sess_cmds(
2488 struct se_session
*se_sess
,
2491 struct se_cmd
*se_cmd
, *tmp_cmd
;
2494 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
2495 &se_sess
->sess_cmd_list
, se_cmd_list
) {
2496 list_del(&se_cmd
->se_cmd_list
);
2498 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2499 " %d\n", se_cmd
, se_cmd
->t_state
,
2500 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2502 if (wait_for_tasks
) {
2503 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2504 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2505 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2507 rc
= transport_wait_for_tasks(se_cmd
);
2509 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2510 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2511 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2515 wait_for_completion(&se_cmd
->cmd_wait_comp
);
2516 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2517 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2518 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2521 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2524 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
2526 /* transport_lun_wait_for_tasks():
2528 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2529 * an struct se_lun to be successfully shutdown.
2531 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
2533 unsigned long flags
;
2537 * If the frontend has already requested this struct se_cmd to
2538 * be stopped, we can safely ignore this struct se_cmd.
2540 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2541 if (cmd
->transport_state
& CMD_T_STOP
) {
2542 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
2544 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2545 cmd
->se_tfo
->get_task_tag(cmd
));
2546 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2547 transport_cmd_check_stop(cmd
, false);
2550 cmd
->transport_state
|= CMD_T_LUN_FE_STOP
;
2551 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2553 // XXX: audit task_flags checks.
2554 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2555 if ((cmd
->transport_state
& CMD_T_BUSY
) &&
2556 (cmd
->transport_state
& CMD_T_SENT
)) {
2557 if (!target_stop_cmd(cmd
, &flags
))
2560 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2562 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2565 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2566 cmd
->se_tfo
->get_task_tag(cmd
));
2567 wait_for_completion(&cmd
->transport_lun_stop_comp
);
2568 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2569 cmd
->se_tfo
->get_task_tag(cmd
));
2575 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
2577 struct se_cmd
*cmd
= NULL
;
2578 unsigned long lun_flags
, cmd_flags
;
2580 * Do exception processing and return CHECK_CONDITION status to the
2583 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2584 while (!list_empty(&lun
->lun_cmd_list
)) {
2585 cmd
= list_first_entry(&lun
->lun_cmd_list
,
2586 struct se_cmd
, se_lun_node
);
2587 list_del_init(&cmd
->se_lun_node
);
2589 spin_lock(&cmd
->t_state_lock
);
2590 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2591 "_lun_stop for ITT: 0x%08x\n",
2592 cmd
->se_lun
->unpacked_lun
,
2593 cmd
->se_tfo
->get_task_tag(cmd
));
2594 cmd
->transport_state
|= CMD_T_LUN_STOP
;
2595 spin_unlock(&cmd
->t_state_lock
);
2597 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
2600 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2601 cmd
->se_tfo
->get_task_tag(cmd
),
2602 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2606 * If the Storage engine still owns the iscsi_cmd_t, determine
2607 * and/or stop its context.
2609 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2610 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
2611 cmd
->se_tfo
->get_task_tag(cmd
));
2613 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
2614 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2618 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2619 "_wait_for_tasks(): SUCCESS\n",
2620 cmd
->se_lun
->unpacked_lun
,
2621 cmd
->se_tfo
->get_task_tag(cmd
));
2623 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
2624 if (!(cmd
->transport_state
& CMD_T_DEV_ACTIVE
)) {
2625 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2628 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
2629 target_remove_from_state_list(cmd
);
2630 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2633 * The Storage engine stopped this struct se_cmd before it was
2634 * send to the fabric frontend for delivery back to the
2635 * Initiator Node. Return this SCSI CDB back with an
2636 * CHECK_CONDITION status.
2639 transport_send_check_condition_and_sense(cmd
,
2640 TCM_NON_EXISTENT_LUN
, 0);
2642 * If the fabric frontend is waiting for this iscsi_cmd_t to
2643 * be released, notify the waiting thread now that LU has
2644 * finished accessing it.
2646 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
2647 if (cmd
->transport_state
& CMD_T_LUN_FE_STOP
) {
2648 pr_debug("SE_LUN[%d] - Detected FE stop for"
2649 " struct se_cmd: %p ITT: 0x%08x\n",
2651 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
2653 spin_unlock_irqrestore(&cmd
->t_state_lock
,
2655 transport_cmd_check_stop(cmd
, false);
2656 complete(&cmd
->transport_lun_fe_stop_comp
);
2657 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2660 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2661 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
2663 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2664 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2666 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
2669 static int transport_clear_lun_thread(void *p
)
2671 struct se_lun
*lun
= p
;
2673 __transport_clear_lun_from_sessions(lun
);
2674 complete(&lun
->lun_shutdown_comp
);
2679 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
2681 struct task_struct
*kt
;
2683 kt
= kthread_run(transport_clear_lun_thread
, lun
,
2684 "tcm_cl_%u", lun
->unpacked_lun
);
2686 pr_err("Unable to start clear_lun thread\n");
2689 wait_for_completion(&lun
->lun_shutdown_comp
);
2695 * transport_wait_for_tasks - wait for completion to occur
2696 * @cmd: command to wait
2698 * Called from frontend fabric context to wait for storage engine
2699 * to pause and/or release frontend generated struct se_cmd.
2701 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
2703 unsigned long flags
;
2705 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2706 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
2707 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2708 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2712 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
2713 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2714 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2718 * If we are already stopped due to an external event (ie: LUN shutdown)
2719 * sleep until the connection can have the passed struct se_cmd back.
2720 * The cmd->transport_lun_stopped_sem will be upped by
2721 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2722 * has completed its operation on the struct se_cmd.
2724 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
2725 pr_debug("wait_for_tasks: Stopping"
2726 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2727 "_stop_comp); for ITT: 0x%08x\n",
2728 cmd
->se_tfo
->get_task_tag(cmd
));
2730 * There is a special case for WRITES where a FE exception +
2731 * LUN shutdown means ConfigFS context is still sleeping on
2732 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2733 * We go ahead and up transport_lun_stop_comp just to be sure
2736 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2737 complete(&cmd
->transport_lun_stop_comp
);
2738 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
2739 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2741 target_remove_from_state_list(cmd
);
2743 * At this point, the frontend who was the originator of this
2744 * struct se_cmd, now owns the structure and can be released through
2745 * normal means below.
2747 pr_debug("wait_for_tasks: Stopped"
2748 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2749 "stop_comp); for ITT: 0x%08x\n",
2750 cmd
->se_tfo
->get_task_tag(cmd
));
2752 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
2755 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
2756 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2760 cmd
->transport_state
|= CMD_T_STOP
;
2762 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2763 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2764 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
2765 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2767 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2769 wait_for_completion(&cmd
->t_transport_stop_comp
);
2771 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2772 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
2774 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
2775 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2776 cmd
->se_tfo
->get_task_tag(cmd
));
2778 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2782 EXPORT_SYMBOL(transport_wait_for_tasks
);
2784 static int transport_get_sense_codes(
2789 *asc
= cmd
->scsi_asc
;
2790 *ascq
= cmd
->scsi_ascq
;
2795 static int transport_set_sense_codes(
2800 cmd
->scsi_asc
= asc
;
2801 cmd
->scsi_ascq
= ascq
;
2806 int transport_send_check_condition_and_sense(
2811 unsigned char *buffer
= cmd
->sense_buffer
;
2812 unsigned long flags
;
2814 u8 asc
= 0, ascq
= 0;
2816 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2817 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2818 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2821 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
2822 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2824 if (!reason
&& from_transport
)
2827 if (!from_transport
)
2828 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
2830 * Data Segment and SenseLength of the fabric response PDU.
2832 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2833 * from include/scsi/scsi_cmnd.h
2835 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2836 TRANSPORT_SENSE_BUFFER
);
2838 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2839 * SENSE KEY values from include/scsi/scsi.h
2842 case TCM_NON_EXISTENT_LUN
:
2844 buffer
[offset
] = 0x70;
2845 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2846 /* ILLEGAL REQUEST */
2847 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2848 /* LOGICAL UNIT NOT SUPPORTED */
2849 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
2851 case TCM_UNSUPPORTED_SCSI_OPCODE
:
2852 case TCM_SECTOR_COUNT_TOO_MANY
:
2854 buffer
[offset
] = 0x70;
2855 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2856 /* ILLEGAL REQUEST */
2857 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2858 /* INVALID COMMAND OPERATION CODE */
2859 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
2861 case TCM_UNKNOWN_MODE_PAGE
:
2863 buffer
[offset
] = 0x70;
2864 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2865 /* ILLEGAL REQUEST */
2866 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2867 /* INVALID FIELD IN CDB */
2868 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
2870 case TCM_CHECK_CONDITION_ABORT_CMD
:
2872 buffer
[offset
] = 0x70;
2873 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2874 /* ABORTED COMMAND */
2875 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2876 /* BUS DEVICE RESET FUNCTION OCCURRED */
2877 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
2878 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
2880 case TCM_INCORRECT_AMOUNT_OF_DATA
:
2882 buffer
[offset
] = 0x70;
2883 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2884 /* ABORTED COMMAND */
2885 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2887 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
2888 /* NOT ENOUGH UNSOLICITED DATA */
2889 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
2891 case TCM_INVALID_CDB_FIELD
:
2893 buffer
[offset
] = 0x70;
2894 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2895 /* ILLEGAL REQUEST */
2896 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2897 /* INVALID FIELD IN CDB */
2898 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
2900 case TCM_INVALID_PARAMETER_LIST
:
2902 buffer
[offset
] = 0x70;
2903 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2904 /* ILLEGAL REQUEST */
2905 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2906 /* INVALID FIELD IN PARAMETER LIST */
2907 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
2909 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
2911 buffer
[offset
] = 0x70;
2912 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2913 /* ABORTED COMMAND */
2914 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2916 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
2917 /* UNEXPECTED_UNSOLICITED_DATA */
2918 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
2920 case TCM_SERVICE_CRC_ERROR
:
2922 buffer
[offset
] = 0x70;
2923 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2924 /* ABORTED COMMAND */
2925 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2926 /* PROTOCOL SERVICE CRC ERROR */
2927 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
2929 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
2931 case TCM_SNACK_REJECTED
:
2933 buffer
[offset
] = 0x70;
2934 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2935 /* ABORTED COMMAND */
2936 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2938 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
2939 /* FAILED RETRANSMISSION REQUEST */
2940 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
2942 case TCM_WRITE_PROTECTED
:
2944 buffer
[offset
] = 0x70;
2945 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2947 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
2948 /* WRITE PROTECTED */
2949 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
2951 case TCM_ADDRESS_OUT_OF_RANGE
:
2953 buffer
[offset
] = 0x70;
2954 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2955 /* ILLEGAL REQUEST */
2956 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2957 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2958 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x21;
2960 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
2962 buffer
[offset
] = 0x70;
2963 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2964 /* UNIT ATTENTION */
2965 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
2966 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
2967 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
2968 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
2970 case TCM_CHECK_CONDITION_NOT_READY
:
2972 buffer
[offset
] = 0x70;
2973 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2975 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
2976 transport_get_sense_codes(cmd
, &asc
, &ascq
);
2977 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
2978 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
2980 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
2983 buffer
[offset
] = 0x70;
2984 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2985 /* ILLEGAL REQUEST */
2986 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2987 /* LOGICAL UNIT COMMUNICATION FAILURE */
2988 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
2992 * This code uses linux/include/scsi/scsi.h SAM status codes!
2994 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
2996 * Automatically padded, this value is encoded in the fabric's
2997 * data_length response PDU containing the SCSI defined sense data.
2999 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
3002 return cmd
->se_tfo
->queue_status(cmd
);
3004 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
3006 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
3010 if (cmd
->transport_state
& CMD_T_ABORTED
) {
3012 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
3015 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3016 " status for CDB: 0x%02x ITT: 0x%08x\n",
3018 cmd
->se_tfo
->get_task_tag(cmd
));
3020 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
3021 cmd
->se_tfo
->queue_status(cmd
);
3026 EXPORT_SYMBOL(transport_check_aborted_status
);
3028 void transport_send_task_abort(struct se_cmd
*cmd
)
3030 unsigned long flags
;
3032 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3033 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
3034 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3037 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3040 * If there are still expected incoming fabric WRITEs, we wait
3041 * until until they have completed before sending a TASK_ABORTED
3042 * response. This response with TASK_ABORTED status will be
3043 * queued back to fabric module by transport_check_aborted_status().
3045 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3046 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
3047 cmd
->transport_state
|= CMD_T_ABORTED
;
3048 smp_mb__after_atomic_inc();
3051 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
3053 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3054 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
3055 cmd
->se_tfo
->get_task_tag(cmd
));
3057 cmd
->se_tfo
->queue_status(cmd
);
3060 static void target_tmr_work(struct work_struct
*work
)
3062 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3063 struct se_device
*dev
= cmd
->se_dev
;
3064 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
3067 switch (tmr
->function
) {
3068 case TMR_ABORT_TASK
:
3069 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
3071 case TMR_ABORT_TASK_SET
:
3073 case TMR_CLEAR_TASK_SET
:
3074 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
3077 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
3078 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
3079 TMR_FUNCTION_REJECTED
;
3081 case TMR_TARGET_WARM_RESET
:
3082 tmr
->response
= TMR_FUNCTION_REJECTED
;
3084 case TMR_TARGET_COLD_RESET
:
3085 tmr
->response
= TMR_FUNCTION_REJECTED
;
3088 pr_err("Uknown TMR function: 0x%02x.\n",
3090 tmr
->response
= TMR_FUNCTION_REJECTED
;
3094 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
3095 cmd
->se_tfo
->queue_tm_rsp(cmd
);
3097 transport_cmd_check_stop_to_fabric(cmd
);
3100 int transport_generic_handle_tmr(
3103 INIT_WORK(&cmd
->work
, target_tmr_work
);
3104 queue_work(cmd
->se_dev
->tmr_wq
, &cmd
->work
);
3107 EXPORT_SYMBOL(transport_generic_handle_tmr
);