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
);
570 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
572 struct se_device
*dev
= cmd
->se_dev
;
573 int success
= scsi_status
== GOOD
;
576 cmd
->scsi_status
= scsi_status
;
579 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
580 cmd
->transport_state
&= ~CMD_T_BUSY
;
582 if (dev
&& dev
->transport
->transport_complete
) {
583 if (dev
->transport
->transport_complete(cmd
,
584 cmd
->t_data_sg
) != 0) {
585 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
591 * See if we are waiting to complete for an exception condition.
593 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
594 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
595 complete(&cmd
->task_stop_comp
);
600 cmd
->transport_state
|= CMD_T_FAILED
;
603 * Check for case where an explict ABORT_TASK has been received
604 * and transport_wait_for_tasks() will be waiting for completion..
606 if (cmd
->transport_state
& CMD_T_ABORTED
&&
607 cmd
->transport_state
& CMD_T_STOP
) {
608 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
609 complete(&cmd
->t_transport_stop_comp
);
611 } else if (cmd
->transport_state
& CMD_T_FAILED
) {
612 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
613 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
615 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
618 cmd
->t_state
= TRANSPORT_COMPLETE
;
619 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
620 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
622 queue_work(target_completion_wq
, &cmd
->work
);
624 EXPORT_SYMBOL(target_complete_cmd
);
626 static void target_add_to_state_list(struct se_cmd
*cmd
)
628 struct se_device
*dev
= cmd
->se_dev
;
631 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
632 if (!cmd
->state_active
) {
633 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
634 cmd
->state_active
= true;
636 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
640 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
642 static void transport_write_pending_qf(struct se_cmd
*cmd
);
643 static void transport_complete_qf(struct se_cmd
*cmd
);
645 static void target_qf_do_work(struct work_struct
*work
)
647 struct se_device
*dev
= container_of(work
, struct se_device
,
649 LIST_HEAD(qf_cmd_list
);
650 struct se_cmd
*cmd
, *cmd_tmp
;
652 spin_lock_irq(&dev
->qf_cmd_lock
);
653 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
654 spin_unlock_irq(&dev
->qf_cmd_lock
);
656 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
657 list_del(&cmd
->se_qf_node
);
658 atomic_dec(&dev
->dev_qf_count
);
659 smp_mb__after_atomic_dec();
661 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
662 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
663 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
664 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
667 if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
)
668 transport_write_pending_qf(cmd
);
669 else if (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
)
670 transport_complete_qf(cmd
);
674 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
676 switch (cmd
->data_direction
) {
679 case DMA_FROM_DEVICE
:
683 case DMA_BIDIRECTIONAL
:
692 void transport_dump_dev_state(
693 struct se_device
*dev
,
697 *bl
+= sprintf(b
+ *bl
, "Status: ");
698 switch (dev
->dev_status
) {
699 case TRANSPORT_DEVICE_ACTIVATED
:
700 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
702 case TRANSPORT_DEVICE_DEACTIVATED
:
703 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
705 case TRANSPORT_DEVICE_SHUTDOWN
:
706 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
708 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
709 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
710 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
713 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
717 *bl
+= sprintf(b
+ *bl
, " Max Queue Depth: %d", dev
->queue_depth
);
718 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u HwMaxSectors: %u\n",
719 dev
->se_sub_dev
->se_dev_attrib
.block_size
,
720 dev
->se_sub_dev
->se_dev_attrib
.hw_max_sectors
);
721 *bl
+= sprintf(b
+ *bl
, " ");
724 void transport_dump_vpd_proto_id(
726 unsigned char *p_buf
,
729 unsigned char buf
[VPD_TMP_BUF_SIZE
];
732 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
733 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
735 switch (vpd
->protocol_identifier
) {
737 sprintf(buf
+len
, "Fibre Channel\n");
740 sprintf(buf
+len
, "Parallel SCSI\n");
743 sprintf(buf
+len
, "SSA\n");
746 sprintf(buf
+len
, "IEEE 1394\n");
749 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
753 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
756 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
759 sprintf(buf
+len
, "Automation/Drive Interface Transport"
763 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
766 sprintf(buf
+len
, "Unknown 0x%02x\n",
767 vpd
->protocol_identifier
);
772 strncpy(p_buf
, buf
, p_buf_len
);
778 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
781 * Check if the Protocol Identifier Valid (PIV) bit is set..
783 * from spc3r23.pdf section 7.5.1
785 if (page_83
[1] & 0x80) {
786 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
787 vpd
->protocol_identifier_set
= 1;
788 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
791 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
793 int transport_dump_vpd_assoc(
795 unsigned char *p_buf
,
798 unsigned char buf
[VPD_TMP_BUF_SIZE
];
802 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
803 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
805 switch (vpd
->association
) {
807 sprintf(buf
+len
, "addressed logical unit\n");
810 sprintf(buf
+len
, "target port\n");
813 sprintf(buf
+len
, "SCSI target device\n");
816 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
822 strncpy(p_buf
, buf
, p_buf_len
);
829 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
832 * The VPD identification association..
834 * from spc3r23.pdf Section 7.6.3.1 Table 297
836 vpd
->association
= (page_83
[1] & 0x30);
837 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
839 EXPORT_SYMBOL(transport_set_vpd_assoc
);
841 int transport_dump_vpd_ident_type(
843 unsigned char *p_buf
,
846 unsigned char buf
[VPD_TMP_BUF_SIZE
];
850 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
851 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
853 switch (vpd
->device_identifier_type
) {
855 sprintf(buf
+len
, "Vendor specific\n");
858 sprintf(buf
+len
, "T10 Vendor ID based\n");
861 sprintf(buf
+len
, "EUI-64 based\n");
864 sprintf(buf
+len
, "NAA\n");
867 sprintf(buf
+len
, "Relative target port identifier\n");
870 sprintf(buf
+len
, "SCSI name string\n");
873 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
874 vpd
->device_identifier_type
);
880 if (p_buf_len
< strlen(buf
)+1)
882 strncpy(p_buf
, buf
, p_buf_len
);
890 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
893 * The VPD identifier type..
895 * from spc3r23.pdf Section 7.6.3.1 Table 298
897 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
898 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
900 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
902 int transport_dump_vpd_ident(
904 unsigned char *p_buf
,
907 unsigned char buf
[VPD_TMP_BUF_SIZE
];
910 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
912 switch (vpd
->device_identifier_code_set
) {
913 case 0x01: /* Binary */
914 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
915 &vpd
->device_identifier
[0]);
917 case 0x02: /* ASCII */
918 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
919 &vpd
->device_identifier
[0]);
921 case 0x03: /* UTF-8 */
922 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
923 &vpd
->device_identifier
[0]);
926 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
927 " 0x%02x", vpd
->device_identifier_code_set
);
933 strncpy(p_buf
, buf
, p_buf_len
);
941 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
943 static const char hex_str
[] = "0123456789abcdef";
944 int j
= 0, i
= 4; /* offset to start of the identifer */
947 * The VPD Code Set (encoding)
949 * from spc3r23.pdf Section 7.6.3.1 Table 296
951 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
952 switch (vpd
->device_identifier_code_set
) {
953 case 0x01: /* Binary */
954 vpd
->device_identifier
[j
++] =
955 hex_str
[vpd
->device_identifier_type
];
956 while (i
< (4 + page_83
[3])) {
957 vpd
->device_identifier
[j
++] =
958 hex_str
[(page_83
[i
] & 0xf0) >> 4];
959 vpd
->device_identifier
[j
++] =
960 hex_str
[page_83
[i
] & 0x0f];
964 case 0x02: /* ASCII */
965 case 0x03: /* UTF-8 */
966 while (i
< (4 + page_83
[3]))
967 vpd
->device_identifier
[j
++] = page_83
[i
++];
973 return transport_dump_vpd_ident(vpd
, NULL
, 0);
975 EXPORT_SYMBOL(transport_set_vpd_ident
);
977 static void core_setup_task_attr_emulation(struct se_device
*dev
)
980 * If this device is from Target_Core_Mod/pSCSI, disable the
981 * SAM Task Attribute emulation.
983 * This is currently not available in upsream Linux/SCSI Target
984 * mode code, and is assumed to be disabled while using TCM/pSCSI.
986 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
987 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
991 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
992 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
993 " device\n", dev
->transport
->name
,
994 dev
->transport
->get_device_rev(dev
));
997 static void scsi_dump_inquiry(struct se_device
*dev
)
999 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1003 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1005 for (i
= 0; i
< 8; i
++)
1006 if (wwn
->vendor
[i
] >= 0x20)
1007 buf
[i
] = wwn
->vendor
[i
];
1011 pr_debug(" Vendor: %s\n", buf
);
1013 for (i
= 0; i
< 16; i
++)
1014 if (wwn
->model
[i
] >= 0x20)
1015 buf
[i
] = wwn
->model
[i
];
1019 pr_debug(" Model: %s\n", buf
);
1021 for (i
= 0; i
< 4; i
++)
1022 if (wwn
->revision
[i
] >= 0x20)
1023 buf
[i
] = wwn
->revision
[i
];
1027 pr_debug(" Revision: %s\n", buf
);
1029 device_type
= dev
->transport
->get_device_type(dev
);
1030 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1031 pr_debug(" ANSI SCSI revision: %02x\n",
1032 dev
->transport
->get_device_rev(dev
));
1035 struct se_device
*transport_add_device_to_core_hba(
1037 struct se_subsystem_api
*transport
,
1038 struct se_subsystem_dev
*se_dev
,
1040 void *transport_dev
,
1041 struct se_dev_limits
*dev_limits
,
1042 const char *inquiry_prod
,
1043 const char *inquiry_rev
)
1046 struct se_device
*dev
;
1048 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1050 pr_err("Unable to allocate memory for se_dev_t\n");
1054 dev
->dev_flags
= device_flags
;
1055 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1056 dev
->dev_ptr
= transport_dev
;
1058 dev
->se_sub_dev
= se_dev
;
1059 dev
->transport
= transport
;
1060 INIT_LIST_HEAD(&dev
->dev_list
);
1061 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1062 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1063 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1064 INIT_LIST_HEAD(&dev
->state_list
);
1065 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1066 spin_lock_init(&dev
->execute_task_lock
);
1067 spin_lock_init(&dev
->delayed_cmd_lock
);
1068 spin_lock_init(&dev
->dev_reservation_lock
);
1069 spin_lock_init(&dev
->dev_status_lock
);
1070 spin_lock_init(&dev
->se_port_lock
);
1071 spin_lock_init(&dev
->se_tmr_lock
);
1072 spin_lock_init(&dev
->qf_cmd_lock
);
1073 atomic_set(&dev
->dev_ordered_id
, 0);
1075 se_dev_set_default_attribs(dev
, dev_limits
);
1077 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1078 dev
->creation_time
= get_jiffies_64();
1079 spin_lock_init(&dev
->stats_lock
);
1081 spin_lock(&hba
->device_lock
);
1082 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1084 spin_unlock(&hba
->device_lock
);
1086 * Setup the SAM Task Attribute emulation for struct se_device
1088 core_setup_task_attr_emulation(dev
);
1090 * Force PR and ALUA passthrough emulation with internal object use.
1092 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1094 * Setup the Reservations infrastructure for struct se_device
1096 core_setup_reservations(dev
, force_pt
);
1098 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1100 if (core_setup_alua(dev
, force_pt
) < 0)
1104 * Startup the struct se_device processing thread
1106 dev
->tmr_wq
= alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1,
1107 dev
->transport
->name
);
1109 pr_err("Unable to create tmr workqueue for %s\n",
1110 dev
->transport
->name
);
1114 * Setup work_queue for QUEUE_FULL
1116 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1118 * Preload the initial INQUIRY const values if we are doing
1119 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1120 * passthrough because this is being provided by the backend LLD.
1121 * This is required so that transport_get_inquiry() copies these
1122 * originals once back into DEV_T10_WWN(dev) for the virtual device
1125 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1126 if (!inquiry_prod
|| !inquiry_rev
) {
1127 pr_err("All non TCM/pSCSI plugins require"
1128 " INQUIRY consts\n");
1132 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1133 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1134 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1136 scsi_dump_inquiry(dev
);
1141 destroy_workqueue(dev
->tmr_wq
);
1143 spin_lock(&hba
->device_lock
);
1144 list_del(&dev
->dev_list
);
1146 spin_unlock(&hba
->device_lock
);
1148 se_release_vpd_for_dev(dev
);
1154 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1156 int target_cmd_size_check(struct se_cmd
*cmd
, unsigned int size
)
1158 struct se_device
*dev
= cmd
->se_dev
;
1160 if (cmd
->unknown_data_length
) {
1161 cmd
->data_length
= size
;
1162 } else if (size
!= cmd
->data_length
) {
1163 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1164 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1165 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
1166 cmd
->data_length
, size
, cmd
->t_task_cdb
[0]);
1168 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
1169 pr_err("Rejecting underflow/overflow"
1171 goto out_invalid_cdb_field
;
1174 * Reject READ_* or WRITE_* with overflow/underflow for
1175 * type SCF_SCSI_DATA_CDB.
1177 if (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512) {
1178 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1179 " CDB on non 512-byte sector setup subsystem"
1180 " plugin: %s\n", dev
->transport
->name
);
1181 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1182 goto out_invalid_cdb_field
;
1185 if (size
> cmd
->data_length
) {
1186 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
1187 cmd
->residual_count
= (size
- cmd
->data_length
);
1189 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
1190 cmd
->residual_count
= (cmd
->data_length
- size
);
1192 cmd
->data_length
= size
;
1197 out_invalid_cdb_field
:
1198 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1199 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1204 * Used by fabric modules containing a local struct se_cmd within their
1205 * fabric dependent per I/O descriptor.
1207 void transport_init_se_cmd(
1209 struct target_core_fabric_ops
*tfo
,
1210 struct se_session
*se_sess
,
1214 unsigned char *sense_buffer
)
1216 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1217 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1218 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1219 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1220 INIT_LIST_HEAD(&cmd
->state_list
);
1221 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1222 init_completion(&cmd
->transport_lun_stop_comp
);
1223 init_completion(&cmd
->t_transport_stop_comp
);
1224 init_completion(&cmd
->cmd_wait_comp
);
1225 init_completion(&cmd
->task_stop_comp
);
1226 spin_lock_init(&cmd
->t_state_lock
);
1227 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1230 cmd
->se_sess
= se_sess
;
1231 cmd
->data_length
= data_length
;
1232 cmd
->data_direction
= data_direction
;
1233 cmd
->sam_task_attr
= task_attr
;
1234 cmd
->sense_buffer
= sense_buffer
;
1236 cmd
->state_active
= false;
1238 EXPORT_SYMBOL(transport_init_se_cmd
);
1240 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1243 * Check if SAM Task Attribute emulation is enabled for this
1244 * struct se_device storage object
1246 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1249 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1250 pr_debug("SAM Task Attribute ACA"
1251 " emulation is not supported\n");
1255 * Used to determine when ORDERED commands should go from
1256 * Dormant to Active status.
1258 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1259 smp_mb__after_atomic_inc();
1260 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1261 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1262 cmd
->se_dev
->transport
->name
);
1266 /* target_setup_cmd_from_cdb():
1268 * Called from fabric RX Thread.
1270 int target_setup_cmd_from_cdb(
1274 struct se_subsystem_dev
*su_dev
= cmd
->se_dev
->se_sub_dev
;
1275 u32 pr_reg_type
= 0;
1277 unsigned long flags
;
1281 * Ensure that the received CDB is less than the max (252 + 8) bytes
1282 * for VARIABLE_LENGTH_CMD
1284 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1285 pr_err("Received SCSI CDB with command_size: %d that"
1286 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1287 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1288 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1289 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1293 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1294 * allocate the additional extended CDB buffer now.. Otherwise
1295 * setup the pointer from __t_task_cdb to t_task_cdb.
1297 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1298 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1300 if (!cmd
->t_task_cdb
) {
1301 pr_err("Unable to allocate cmd->t_task_cdb"
1302 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1303 scsi_command_size(cdb
),
1304 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1305 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1306 cmd
->scsi_sense_reason
=
1307 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1311 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1313 * Copy the original CDB into cmd->
1315 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1318 * Check for an existing UNIT ATTENTION condition
1320 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
1321 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1322 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
1326 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
1329 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1330 * The ALUA additional sense code qualifier (ASCQ) is determined
1331 * by the ALUA primary or secondary access state..
1334 pr_debug("[%s]: ALUA TG Port not available, "
1335 "SenseKey: NOT_READY, ASC/ASCQ: "
1337 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
1339 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
1340 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1341 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
1344 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1345 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1350 * Check status for SPC-3 Persistent Reservations
1352 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
)) {
1353 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
1354 cmd
, cdb
, pr_reg_type
) != 0) {
1355 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1356 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
1357 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1358 cmd
->scsi_sense_reason
= TCM_RESERVATION_CONFLICT
;
1362 * This means the CDB is allowed for the SCSI Initiator port
1363 * when said port is *NOT* holding the legacy SPC-2 or
1364 * SPC-3 Persistent Reservation.
1368 ret
= cmd
->se_dev
->transport
->parse_cdb(cmd
);
1372 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1373 cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1374 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1377 * Check for SAM Task Attribute Emulation
1379 if (transport_check_alloc_task_attr(cmd
) < 0) {
1380 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1381 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1384 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1385 if (cmd
->se_lun
->lun_sep
)
1386 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1387 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1390 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1393 * Used by fabric module frontends to queue tasks directly.
1394 * Many only be used from process context only
1396 int transport_handle_cdb_direct(
1403 pr_err("cmd->se_lun is NULL\n");
1406 if (in_interrupt()) {
1408 pr_err("transport_generic_handle_cdb cannot be called"
1409 " from interrupt context\n");
1413 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1414 * outstanding descriptors are handled correctly during shutdown via
1415 * transport_wait_for_tasks()
1417 * Also, we don't take cmd->t_state_lock here as we only expect
1418 * this to be called for initial descriptor submission.
1420 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1421 cmd
->transport_state
|= CMD_T_ACTIVE
;
1424 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1425 * so follow TRANSPORT_NEW_CMD processing thread context usage
1426 * and call transport_generic_request_failure() if necessary..
1428 ret
= transport_generic_new_cmd(cmd
);
1430 transport_generic_request_failure(cmd
);
1434 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1437 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1439 * @se_cmd: command descriptor to submit
1440 * @se_sess: associated se_sess for endpoint
1441 * @cdb: pointer to SCSI CDB
1442 * @sense: pointer to SCSI sense buffer
1443 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1444 * @data_length: fabric expected data transfer length
1445 * @task_addr: SAM task attribute
1446 * @data_dir: DMA data direction
1447 * @flags: flags for command submission from target_sc_flags_tables
1449 * Returns non zero to signal active I/O shutdown failure. All other
1450 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1451 * but still return zero here.
1453 * This may only be called from process context, and also currently
1454 * assumes internal allocation of fabric payload buffer by target-core.
1456 int target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1457 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1458 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1460 struct se_portal_group
*se_tpg
;
1463 se_tpg
= se_sess
->se_tpg
;
1465 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1466 BUG_ON(in_interrupt());
1468 * Initialize se_cmd for target operation. From this point
1469 * exceptions are handled by sending exception status via
1470 * target_core_fabric_ops->queue_status() callback
1472 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1473 data_length
, data_dir
, task_attr
, sense
);
1474 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1475 se_cmd
->unknown_data_length
= 1;
1477 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1478 * se_sess->sess_cmd_list. A second kref_get here is necessary
1479 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1480 * kref_put() to happen during fabric packet acknowledgement.
1482 rc
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1486 * Signal bidirectional data payloads to target-core
1488 if (flags
& TARGET_SCF_BIDI_OP
)
1489 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1491 * Locate se_lun pointer and attach it to struct se_cmd
1493 if (transport_lookup_cmd_lun(se_cmd
, unpacked_lun
) < 0) {
1494 transport_send_check_condition_and_sense(se_cmd
,
1495 se_cmd
->scsi_sense_reason
, 0);
1496 target_put_sess_cmd(se_sess
, se_cmd
);
1500 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1502 transport_generic_request_failure(se_cmd
);
1507 * Check if we need to delay processing because of ALUA
1508 * Active/NonOptimized primary access state..
1510 core_alua_check_nonop_delay(se_cmd
);
1512 transport_handle_cdb_direct(se_cmd
);
1515 EXPORT_SYMBOL(target_submit_cmd
);
1517 static void target_complete_tmr_failure(struct work_struct
*work
)
1519 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1521 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1522 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1523 transport_generic_free_cmd(se_cmd
, 0);
1527 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1530 * @se_cmd: command descriptor to submit
1531 * @se_sess: associated se_sess for endpoint
1532 * @sense: pointer to SCSI sense buffer
1533 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1534 * @fabric_context: fabric context for TMR req
1535 * @tm_type: Type of TM request
1536 * @gfp: gfp type for caller
1537 * @tag: referenced task tag for TMR_ABORT_TASK
1538 * @flags: submit cmd flags
1540 * Callable from all contexts.
1543 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1544 unsigned char *sense
, u32 unpacked_lun
,
1545 void *fabric_tmr_ptr
, unsigned char tm_type
,
1546 gfp_t gfp
, unsigned int tag
, int flags
)
1548 struct se_portal_group
*se_tpg
;
1551 se_tpg
= se_sess
->se_tpg
;
1554 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1555 0, DMA_NONE
, MSG_SIMPLE_TAG
, sense
);
1557 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1558 * allocation failure.
1560 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1564 if (tm_type
== TMR_ABORT_TASK
)
1565 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1567 /* See target_submit_cmd for commentary */
1568 ret
= target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1570 core_tmr_release_req(se_cmd
->se_tmr_req
);
1574 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1577 * For callback during failure handling, push this work off
1578 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1580 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1581 schedule_work(&se_cmd
->work
);
1584 transport_generic_handle_tmr(se_cmd
);
1587 EXPORT_SYMBOL(target_submit_tmr
);
1590 * If the cmd is active, request it to be stopped and sleep until it
1593 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1595 bool was_active
= false;
1597 if (cmd
->transport_state
& CMD_T_BUSY
) {
1598 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1599 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1601 pr_debug("cmd %p waiting to complete\n", cmd
);
1602 wait_for_completion(&cmd
->task_stop_comp
);
1603 pr_debug("cmd %p stopped successfully\n", cmd
);
1605 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1606 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1607 cmd
->transport_state
&= ~CMD_T_BUSY
;
1615 * Handle SAM-esque emulation for generic transport request failures.
1617 void transport_generic_request_failure(struct se_cmd
*cmd
)
1621 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1622 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1623 cmd
->t_task_cdb
[0]);
1624 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1625 cmd
->se_tfo
->get_cmd_state(cmd
),
1626 cmd
->t_state
, cmd
->scsi_sense_reason
);
1627 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1628 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1629 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1630 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1633 * For SAM Task Attribute emulation for failed struct se_cmd
1635 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1636 transport_complete_task_attr(cmd
);
1638 switch (cmd
->scsi_sense_reason
) {
1639 case TCM_NON_EXISTENT_LUN
:
1640 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1641 case TCM_INVALID_CDB_FIELD
:
1642 case TCM_INVALID_PARAMETER_LIST
:
1643 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1644 case TCM_UNKNOWN_MODE_PAGE
:
1645 case TCM_WRITE_PROTECTED
:
1646 case TCM_ADDRESS_OUT_OF_RANGE
:
1647 case TCM_CHECK_CONDITION_ABORT_CMD
:
1648 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1649 case TCM_CHECK_CONDITION_NOT_READY
:
1651 case TCM_RESERVATION_CONFLICT
:
1653 * No SENSE Data payload for this case, set SCSI Status
1654 * and queue the response to $FABRIC_MOD.
1656 * Uses linux/include/scsi/scsi.h SAM status codes defs
1658 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1660 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1661 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1664 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1667 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1668 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1669 cmd
->orig_fe_lun
, 0x2C,
1670 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1672 ret
= cmd
->se_tfo
->queue_status(cmd
);
1673 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1677 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1678 cmd
->t_task_cdb
[0], cmd
->scsi_sense_reason
);
1679 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1683 ret
= transport_send_check_condition_and_sense(cmd
,
1684 cmd
->scsi_sense_reason
, 0);
1685 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1689 transport_lun_remove_cmd(cmd
);
1690 if (!transport_cmd_check_stop_to_fabric(cmd
))
1695 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1696 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1698 EXPORT_SYMBOL(transport_generic_request_failure
);
1700 static void __target_execute_cmd(struct se_cmd
*cmd
)
1704 spin_lock_irq(&cmd
->t_state_lock
);
1705 cmd
->transport_state
|= (CMD_T_BUSY
|CMD_T_SENT
);
1706 spin_unlock_irq(&cmd
->t_state_lock
);
1708 if (cmd
->execute_cmd
)
1709 error
= cmd
->execute_cmd(cmd
);
1712 spin_lock_irq(&cmd
->t_state_lock
);
1713 cmd
->transport_state
&= ~(CMD_T_BUSY
|CMD_T_SENT
);
1714 spin_unlock_irq(&cmd
->t_state_lock
);
1716 transport_generic_request_failure(cmd
);
1720 void target_execute_cmd(struct se_cmd
*cmd
)
1722 struct se_device
*dev
= cmd
->se_dev
;
1725 * If the received CDB has aleady been aborted stop processing it here.
1727 if (transport_check_aborted_status(cmd
, 1))
1731 * Determine if IOCTL context caller in requesting the stopping of this
1732 * command for LUN shutdown purposes.
1734 spin_lock_irq(&cmd
->t_state_lock
);
1735 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
1736 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1737 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
1739 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
1740 spin_unlock_irq(&cmd
->t_state_lock
);
1741 complete(&cmd
->transport_lun_stop_comp
);
1745 * Determine if frontend context caller is requesting the stopping of
1746 * this command for frontend exceptions.
1748 if (cmd
->transport_state
& CMD_T_STOP
) {
1749 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1751 cmd
->se_tfo
->get_task_tag(cmd
));
1753 spin_unlock_irq(&cmd
->t_state_lock
);
1754 complete(&cmd
->t_transport_stop_comp
);
1758 cmd
->t_state
= TRANSPORT_PROCESSING
;
1759 spin_unlock_irq(&cmd
->t_state_lock
);
1761 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1765 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1766 * to allow the passed struct se_cmd list of tasks to the front of the list.
1768 switch (cmd
->sam_task_attr
) {
1770 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1771 "se_ordered_id: %u\n",
1772 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1774 case MSG_ORDERED_TAG
:
1775 atomic_inc(&dev
->dev_ordered_sync
);
1776 smp_mb__after_atomic_inc();
1778 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1779 " se_ordered_id: %u\n",
1780 cmd
->t_task_cdb
[0], cmd
->se_ordered_id
);
1783 * Execute an ORDERED command if no other older commands
1784 * exist that need to be completed first.
1786 if (!atomic_read(&dev
->simple_cmds
))
1791 * For SIMPLE and UNTAGGED Task Attribute commands
1793 atomic_inc(&dev
->simple_cmds
);
1794 smp_mb__after_atomic_inc();
1798 if (atomic_read(&dev
->dev_ordered_sync
) != 0) {
1799 spin_lock(&dev
->delayed_cmd_lock
);
1800 list_add_tail(&cmd
->se_delayed_node
, &dev
->delayed_cmd_list
);
1801 spin_unlock(&dev
->delayed_cmd_lock
);
1803 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1804 " delayed CMD list, se_ordered_id: %u\n",
1805 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1806 cmd
->se_ordered_id
);
1812 * Otherwise, no ORDERED task attributes exist..
1814 __target_execute_cmd(cmd
);
1816 EXPORT_SYMBOL(target_execute_cmd
);
1819 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1821 static int transport_get_sense_data(struct se_cmd
*cmd
)
1823 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
1824 struct se_device
*dev
= cmd
->se_dev
;
1825 unsigned long flags
;
1828 WARN_ON(!cmd
->se_lun
);
1833 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1834 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
1835 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1839 if (!(cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
1842 if (!dev
->transport
->get_sense_buffer
) {
1843 pr_err("dev->transport->get_sense_buffer is NULL\n");
1847 sense_buffer
= dev
->transport
->get_sense_buffer(cmd
);
1848 if (!sense_buffer
) {
1849 pr_err("ITT 0x%08x cmd %p: Unable to locate"
1850 " sense buffer for task with sense\n",
1851 cmd
->se_tfo
->get_task_tag(cmd
), cmd
);
1855 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1857 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
, TRANSPORT_SENSE_BUFFER
);
1859 memcpy(&buffer
[offset
], sense_buffer
, TRANSPORT_SENSE_BUFFER
);
1861 /* Automatically padded */
1862 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
1864 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
1865 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
1869 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1874 * Process all commands up to the last received ORDERED task attribute which
1875 * requires another blocking boundary
1877 static void target_restart_delayed_cmds(struct se_device
*dev
)
1882 spin_lock(&dev
->delayed_cmd_lock
);
1883 if (list_empty(&dev
->delayed_cmd_list
)) {
1884 spin_unlock(&dev
->delayed_cmd_lock
);
1888 cmd
= list_entry(dev
->delayed_cmd_list
.next
,
1889 struct se_cmd
, se_delayed_node
);
1890 list_del(&cmd
->se_delayed_node
);
1891 spin_unlock(&dev
->delayed_cmd_lock
);
1893 __target_execute_cmd(cmd
);
1895 if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
)
1901 * Called from I/O completion to determine which dormant/delayed
1902 * and ordered cmds need to have their tasks added to the execution queue.
1904 static void transport_complete_task_attr(struct se_cmd
*cmd
)
1906 struct se_device
*dev
= cmd
->se_dev
;
1908 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
1909 atomic_dec(&dev
->simple_cmds
);
1910 smp_mb__after_atomic_dec();
1911 dev
->dev_cur_ordered_id
++;
1912 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1913 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
1914 cmd
->se_ordered_id
);
1915 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1916 dev
->dev_cur_ordered_id
++;
1917 pr_debug("Incremented dev_cur_ordered_id: %u for"
1918 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
1919 cmd
->se_ordered_id
);
1920 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1921 atomic_dec(&dev
->dev_ordered_sync
);
1922 smp_mb__after_atomic_dec();
1924 dev
->dev_cur_ordered_id
++;
1925 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1926 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
1929 target_restart_delayed_cmds(dev
);
1932 static void transport_complete_qf(struct se_cmd
*cmd
)
1936 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1937 transport_complete_task_attr(cmd
);
1939 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
1940 ret
= cmd
->se_tfo
->queue_status(cmd
);
1945 switch (cmd
->data_direction
) {
1946 case DMA_FROM_DEVICE
:
1947 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1950 if (cmd
->t_bidi_data_sg
) {
1951 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
1955 /* Fall through for DMA_TO_DEVICE */
1957 ret
= cmd
->se_tfo
->queue_status(cmd
);
1965 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1968 transport_lun_remove_cmd(cmd
);
1969 transport_cmd_check_stop_to_fabric(cmd
);
1972 static void transport_handle_queue_full(
1974 struct se_device
*dev
)
1976 spin_lock_irq(&dev
->qf_cmd_lock
);
1977 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
1978 atomic_inc(&dev
->dev_qf_count
);
1979 smp_mb__after_atomic_inc();
1980 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
1982 schedule_work(&cmd
->se_dev
->qf_work_queue
);
1985 static void target_complete_ok_work(struct work_struct
*work
)
1987 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
1988 int reason
= 0, ret
;
1991 * Check if we need to move delayed/dormant tasks from cmds on the
1992 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1995 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1996 transport_complete_task_attr(cmd
);
1998 * Check to schedule QUEUE_FULL work, or execute an existing
1999 * cmd->transport_qf_callback()
2001 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
2002 schedule_work(&cmd
->se_dev
->qf_work_queue
);
2005 * Check if we need to retrieve a sense buffer from
2006 * the struct se_cmd in question.
2008 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
2009 if (transport_get_sense_data(cmd
) < 0)
2010 reason
= TCM_NON_EXISTENT_LUN
;
2012 if (cmd
->scsi_status
) {
2013 ret
= transport_send_check_condition_and_sense(
2015 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2018 transport_lun_remove_cmd(cmd
);
2019 transport_cmd_check_stop_to_fabric(cmd
);
2024 * Check for a callback, used by amongst other things
2025 * XDWRITE_READ_10 emulation.
2027 if (cmd
->transport_complete_callback
)
2028 cmd
->transport_complete_callback(cmd
);
2030 switch (cmd
->data_direction
) {
2031 case DMA_FROM_DEVICE
:
2032 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2033 if (cmd
->se_lun
->lun_sep
) {
2034 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
2037 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2039 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2040 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2044 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2045 if (cmd
->se_lun
->lun_sep
) {
2046 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
2049 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2051 * Check if we need to send READ payload for BIDI-COMMAND
2053 if (cmd
->t_bidi_data_sg
) {
2054 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
2055 if (cmd
->se_lun
->lun_sep
) {
2056 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
2059 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
2060 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
2061 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2065 /* Fall through for DMA_TO_DEVICE */
2067 ret
= cmd
->se_tfo
->queue_status(cmd
);
2068 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2075 transport_lun_remove_cmd(cmd
);
2076 transport_cmd_check_stop_to_fabric(cmd
);
2080 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2081 " data_direction: %d\n", cmd
, cmd
->data_direction
);
2082 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
2083 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2086 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
2088 struct scatterlist
*sg
;
2091 for_each_sg(sgl
, sg
, nents
, count
)
2092 __free_page(sg_page(sg
));
2097 static inline void transport_free_pages(struct se_cmd
*cmd
)
2099 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
2102 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
2103 cmd
->t_data_sg
= NULL
;
2104 cmd
->t_data_nents
= 0;
2106 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
2107 cmd
->t_bidi_data_sg
= NULL
;
2108 cmd
->t_bidi_data_nents
= 0;
2112 * transport_release_cmd - free a command
2113 * @cmd: command to free
2115 * This routine unconditionally frees a command, and reference counting
2116 * or list removal must be done in the caller.
2118 static void transport_release_cmd(struct se_cmd
*cmd
)
2120 BUG_ON(!cmd
->se_tfo
);
2122 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
2123 core_tmr_release_req(cmd
->se_tmr_req
);
2124 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
2125 kfree(cmd
->t_task_cdb
);
2127 * If this cmd has been setup with target_get_sess_cmd(), drop
2128 * the kref and call ->release_cmd() in kref callback.
2130 if (cmd
->check_release
!= 0) {
2131 target_put_sess_cmd(cmd
->se_sess
, cmd
);
2134 cmd
->se_tfo
->release_cmd(cmd
);
2138 * transport_put_cmd - release a reference to a command
2139 * @cmd: command to release
2141 * This routine releases our reference to the command and frees it if possible.
2143 static void transport_put_cmd(struct se_cmd
*cmd
)
2145 unsigned long flags
;
2147 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2148 if (atomic_read(&cmd
->t_fe_count
)) {
2149 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
2153 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
2154 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
2155 target_remove_from_state_list(cmd
);
2157 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2159 transport_free_pages(cmd
);
2160 transport_release_cmd(cmd
);
2163 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2167 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2168 * allocating in the core.
2169 * @cmd: Associated se_cmd descriptor
2170 * @mem: SGL style memory for TCM WRITE / READ
2171 * @sg_mem_num: Number of SGL elements
2172 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2173 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2175 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2178 int transport_generic_map_mem_to_cmd(
2180 struct scatterlist
*sgl
,
2182 struct scatterlist
*sgl_bidi
,
2185 if (!sgl
|| !sgl_count
)
2189 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2190 * scatterlists already have been set to follow what the fabric
2191 * passes for the original expected data transfer length.
2193 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2194 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2195 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2196 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2197 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
2201 cmd
->t_data_sg
= sgl
;
2202 cmd
->t_data_nents
= sgl_count
;
2204 if (sgl_bidi
&& sgl_bidi_count
) {
2205 cmd
->t_bidi_data_sg
= sgl_bidi
;
2206 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
2208 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
2211 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
2213 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
2215 struct scatterlist
*sg
= cmd
->t_data_sg
;
2216 struct page
**pages
;
2221 * We need to take into account a possible offset here for fabrics like
2222 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2223 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2225 if (!cmd
->t_data_nents
)
2227 else if (cmd
->t_data_nents
== 1)
2228 return kmap(sg_page(sg
)) + sg
->offset
;
2230 /* >1 page. use vmap */
2231 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
2235 /* convert sg[] to pages[] */
2236 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
2237 pages
[i
] = sg_page(sg
);
2240 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
2242 if (!cmd
->t_data_vmap
)
2245 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
2247 EXPORT_SYMBOL(transport_kmap_data_sg
);
2249 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
2251 if (!cmd
->t_data_nents
) {
2253 } else if (cmd
->t_data_nents
== 1) {
2254 kunmap(sg_page(cmd
->t_data_sg
));
2258 vunmap(cmd
->t_data_vmap
);
2259 cmd
->t_data_vmap
= NULL
;
2261 EXPORT_SYMBOL(transport_kunmap_data_sg
);
2264 transport_generic_get_mem(struct se_cmd
*cmd
)
2266 u32 length
= cmd
->data_length
;
2272 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
2273 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
2274 if (!cmd
->t_data_sg
)
2277 cmd
->t_data_nents
= nents
;
2278 sg_init_table(cmd
->t_data_sg
, nents
);
2280 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
? 0 : __GFP_ZERO
;
2283 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
2284 page
= alloc_page(GFP_KERNEL
| zero_flag
);
2288 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
2297 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
2299 kfree(cmd
->t_data_sg
);
2300 cmd
->t_data_sg
= NULL
;
2305 * Allocate any required resources to execute the command. For writes we
2306 * might not have the payload yet, so notify the fabric via a call to
2307 * ->write_pending instead. Otherwise place it on the execution queue.
2309 int transport_generic_new_cmd(struct se_cmd
*cmd
)
2314 * Determine is the TCM fabric module has already allocated physical
2315 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2318 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
2320 ret
= transport_generic_get_mem(cmd
);
2325 * If this command doesn't have any payload and we don't have to call
2326 * into the fabric for data transfers, go ahead and complete it right
2329 if (!cmd
->data_length
) {
2330 spin_lock_irq(&cmd
->t_state_lock
);
2331 cmd
->t_state
= TRANSPORT_COMPLETE
;
2332 cmd
->transport_state
|= CMD_T_ACTIVE
;
2333 spin_unlock_irq(&cmd
->t_state_lock
);
2335 if (cmd
->t_task_cdb
[0] == REQUEST_SENSE
) {
2336 u8 ua_asc
= 0, ua_ascq
= 0;
2338 core_scsi3_ua_clear_for_request_sense(cmd
,
2342 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
2343 queue_work(target_completion_wq
, &cmd
->work
);
2347 atomic_inc(&cmd
->t_fe_count
);
2350 * If this command is not a write we can execute it right here,
2351 * for write buffers we need to notify the fabric driver first
2352 * and let it call back once the write buffers are ready.
2354 target_add_to_state_list(cmd
);
2355 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
2356 target_execute_cmd(cmd
);
2360 spin_lock_irq(&cmd
->t_state_lock
);
2361 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
2362 spin_unlock_irq(&cmd
->t_state_lock
);
2364 transport_cmd_check_stop(cmd
, false);
2366 ret
= cmd
->se_tfo
->write_pending(cmd
);
2367 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
2375 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2376 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2379 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
2380 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
2381 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2384 EXPORT_SYMBOL(transport_generic_new_cmd
);
2386 static void transport_write_pending_qf(struct se_cmd
*cmd
)
2390 ret
= cmd
->se_tfo
->write_pending(cmd
);
2391 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
2392 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2394 transport_handle_queue_full(cmd
, cmd
->se_dev
);
2398 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
2400 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
2401 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
2402 transport_wait_for_tasks(cmd
);
2404 transport_release_cmd(cmd
);
2407 transport_wait_for_tasks(cmd
);
2409 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
2412 transport_lun_remove_cmd(cmd
);
2414 transport_put_cmd(cmd
);
2417 EXPORT_SYMBOL(transport_generic_free_cmd
);
2419 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2420 * @se_sess: session to reference
2421 * @se_cmd: command descriptor to add
2422 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2424 static int target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
2427 unsigned long flags
;
2430 kref_init(&se_cmd
->cmd_kref
);
2432 * Add a second kref if the fabric caller is expecting to handle
2433 * fabric acknowledgement that requires two target_put_sess_cmd()
2434 * invocations before se_cmd descriptor release.
2436 if (ack_kref
== true) {
2437 kref_get(&se_cmd
->cmd_kref
);
2438 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
2441 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2442 if (se_sess
->sess_tearing_down
) {
2446 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
2447 se_cmd
->check_release
= 1;
2450 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2454 static void target_release_cmd_kref(struct kref
*kref
)
2456 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
2457 struct se_session
*se_sess
= se_cmd
->se_sess
;
2458 unsigned long flags
;
2460 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2461 if (list_empty(&se_cmd
->se_cmd_list
)) {
2462 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2463 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2466 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
2467 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2468 complete(&se_cmd
->cmd_wait_comp
);
2471 list_del(&se_cmd
->se_cmd_list
);
2472 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2474 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2477 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2478 * @se_sess: session to reference
2479 * @se_cmd: command descriptor to drop
2481 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
2483 return kref_put(&se_cmd
->cmd_kref
, target_release_cmd_kref
);
2485 EXPORT_SYMBOL(target_put_sess_cmd
);
2487 /* target_sess_cmd_list_set_waiting - Flag all commands in
2488 * sess_cmd_list to complete cmd_wait_comp. Set
2489 * sess_tearing_down so no more commands are queued.
2490 * @se_sess: session to flag
2492 void target_sess_cmd_list_set_waiting(struct se_session
*se_sess
)
2494 struct se_cmd
*se_cmd
;
2495 unsigned long flags
;
2497 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
2499 WARN_ON(se_sess
->sess_tearing_down
);
2500 se_sess
->sess_tearing_down
= 1;
2502 list_for_each_entry(se_cmd
, &se_sess
->sess_cmd_list
, se_cmd_list
)
2503 se_cmd
->cmd_wait_set
= 1;
2505 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
2507 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting
);
2509 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2510 * @se_sess: session to wait for active I/O
2511 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2513 void target_wait_for_sess_cmds(
2514 struct se_session
*se_sess
,
2517 struct se_cmd
*se_cmd
, *tmp_cmd
;
2520 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
2521 &se_sess
->sess_cmd_list
, se_cmd_list
) {
2522 list_del(&se_cmd
->se_cmd_list
);
2524 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2525 " %d\n", se_cmd
, se_cmd
->t_state
,
2526 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2528 if (wait_for_tasks
) {
2529 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2530 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2531 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2533 rc
= transport_wait_for_tasks(se_cmd
);
2535 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2536 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2537 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2541 wait_for_completion(&se_cmd
->cmd_wait_comp
);
2542 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2543 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
2544 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
2547 se_cmd
->se_tfo
->release_cmd(se_cmd
);
2550 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
2552 /* transport_lun_wait_for_tasks():
2554 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2555 * an struct se_lun to be successfully shutdown.
2557 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
2559 unsigned long flags
;
2563 * If the frontend has already requested this struct se_cmd to
2564 * be stopped, we can safely ignore this struct se_cmd.
2566 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2567 if (cmd
->transport_state
& CMD_T_STOP
) {
2568 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
2570 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2571 cmd
->se_tfo
->get_task_tag(cmd
));
2572 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2573 transport_cmd_check_stop(cmd
, false);
2576 cmd
->transport_state
|= CMD_T_LUN_FE_STOP
;
2577 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2579 // XXX: audit task_flags checks.
2580 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2581 if ((cmd
->transport_state
& CMD_T_BUSY
) &&
2582 (cmd
->transport_state
& CMD_T_SENT
)) {
2583 if (!target_stop_cmd(cmd
, &flags
))
2586 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2588 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2591 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2592 cmd
->se_tfo
->get_task_tag(cmd
));
2593 wait_for_completion(&cmd
->transport_lun_stop_comp
);
2594 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2595 cmd
->se_tfo
->get_task_tag(cmd
));
2601 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
2603 struct se_cmd
*cmd
= NULL
;
2604 unsigned long lun_flags
, cmd_flags
;
2606 * Do exception processing and return CHECK_CONDITION status to the
2609 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2610 while (!list_empty(&lun
->lun_cmd_list
)) {
2611 cmd
= list_first_entry(&lun
->lun_cmd_list
,
2612 struct se_cmd
, se_lun_node
);
2613 list_del_init(&cmd
->se_lun_node
);
2615 spin_lock(&cmd
->t_state_lock
);
2616 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2617 "_lun_stop for ITT: 0x%08x\n",
2618 cmd
->se_lun
->unpacked_lun
,
2619 cmd
->se_tfo
->get_task_tag(cmd
));
2620 cmd
->transport_state
|= CMD_T_LUN_STOP
;
2621 spin_unlock(&cmd
->t_state_lock
);
2623 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
2626 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2627 cmd
->se_tfo
->get_task_tag(cmd
),
2628 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2632 * If the Storage engine still owns the iscsi_cmd_t, determine
2633 * and/or stop its context.
2635 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2636 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
2637 cmd
->se_tfo
->get_task_tag(cmd
));
2639 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
2640 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2644 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2645 "_wait_for_tasks(): SUCCESS\n",
2646 cmd
->se_lun
->unpacked_lun
,
2647 cmd
->se_tfo
->get_task_tag(cmd
));
2649 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
2650 if (!(cmd
->transport_state
& CMD_T_DEV_ACTIVE
)) {
2651 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2654 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
2655 target_remove_from_state_list(cmd
);
2656 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2659 * The Storage engine stopped this struct se_cmd before it was
2660 * send to the fabric frontend for delivery back to the
2661 * Initiator Node. Return this SCSI CDB back with an
2662 * CHECK_CONDITION status.
2665 transport_send_check_condition_and_sense(cmd
,
2666 TCM_NON_EXISTENT_LUN
, 0);
2668 * If the fabric frontend is waiting for this iscsi_cmd_t to
2669 * be released, notify the waiting thread now that LU has
2670 * finished accessing it.
2672 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
2673 if (cmd
->transport_state
& CMD_T_LUN_FE_STOP
) {
2674 pr_debug("SE_LUN[%d] - Detected FE stop for"
2675 " struct se_cmd: %p ITT: 0x%08x\n",
2677 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
2679 spin_unlock_irqrestore(&cmd
->t_state_lock
,
2681 transport_cmd_check_stop(cmd
, false);
2682 complete(&cmd
->transport_lun_fe_stop_comp
);
2683 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2686 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2687 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
2689 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
2690 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
2692 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
2695 static int transport_clear_lun_thread(void *p
)
2697 struct se_lun
*lun
= p
;
2699 __transport_clear_lun_from_sessions(lun
);
2700 complete(&lun
->lun_shutdown_comp
);
2705 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
2707 struct task_struct
*kt
;
2709 kt
= kthread_run(transport_clear_lun_thread
, lun
,
2710 "tcm_cl_%u", lun
->unpacked_lun
);
2712 pr_err("Unable to start clear_lun thread\n");
2715 wait_for_completion(&lun
->lun_shutdown_comp
);
2721 * transport_wait_for_tasks - wait for completion to occur
2722 * @cmd: command to wait
2724 * Called from frontend fabric context to wait for storage engine
2725 * to pause and/or release frontend generated struct se_cmd.
2727 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
2729 unsigned long flags
;
2731 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2732 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
2733 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2734 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2738 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
2739 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
2740 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2744 * If we are already stopped due to an external event (ie: LUN shutdown)
2745 * sleep until the connection can have the passed struct se_cmd back.
2746 * The cmd->transport_lun_stopped_sem will be upped by
2747 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2748 * has completed its operation on the struct se_cmd.
2750 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
2751 pr_debug("wait_for_tasks: Stopping"
2752 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2753 "_stop_comp); for ITT: 0x%08x\n",
2754 cmd
->se_tfo
->get_task_tag(cmd
));
2756 * There is a special case for WRITES where a FE exception +
2757 * LUN shutdown means ConfigFS context is still sleeping on
2758 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2759 * We go ahead and up transport_lun_stop_comp just to be sure
2762 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2763 complete(&cmd
->transport_lun_stop_comp
);
2764 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
2765 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2767 target_remove_from_state_list(cmd
);
2769 * At this point, the frontend who was the originator of this
2770 * struct se_cmd, now owns the structure and can be released through
2771 * normal means below.
2773 pr_debug("wait_for_tasks: Stopped"
2774 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2775 "stop_comp); for ITT: 0x%08x\n",
2776 cmd
->se_tfo
->get_task_tag(cmd
));
2778 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
2781 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
2782 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2786 cmd
->transport_state
|= CMD_T_STOP
;
2788 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2789 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2790 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
2791 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
2793 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2795 wait_for_completion(&cmd
->t_transport_stop_comp
);
2797 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2798 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
2800 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
2801 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2802 cmd
->se_tfo
->get_task_tag(cmd
));
2804 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2808 EXPORT_SYMBOL(transport_wait_for_tasks
);
2810 static int transport_get_sense_codes(
2815 *asc
= cmd
->scsi_asc
;
2816 *ascq
= cmd
->scsi_ascq
;
2821 static int transport_set_sense_codes(
2826 cmd
->scsi_asc
= asc
;
2827 cmd
->scsi_ascq
= ascq
;
2832 int transport_send_check_condition_and_sense(
2837 unsigned char *buffer
= cmd
->sense_buffer
;
2838 unsigned long flags
;
2840 u8 asc
= 0, ascq
= 0;
2842 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2843 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2844 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2847 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
2848 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2850 if (!reason
&& from_transport
)
2853 if (!from_transport
)
2854 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
2856 * Data Segment and SenseLength of the fabric response PDU.
2858 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2859 * from include/scsi/scsi_cmnd.h
2861 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2862 TRANSPORT_SENSE_BUFFER
);
2864 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2865 * SENSE KEY values from include/scsi/scsi.h
2868 case TCM_NON_EXISTENT_LUN
:
2870 buffer
[offset
] = 0x70;
2871 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2872 /* ILLEGAL REQUEST */
2873 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2874 /* LOGICAL UNIT NOT SUPPORTED */
2875 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
2877 case TCM_UNSUPPORTED_SCSI_OPCODE
:
2878 case TCM_SECTOR_COUNT_TOO_MANY
:
2880 buffer
[offset
] = 0x70;
2881 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2882 /* ILLEGAL REQUEST */
2883 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2884 /* INVALID COMMAND OPERATION CODE */
2885 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
2887 case TCM_UNKNOWN_MODE_PAGE
:
2889 buffer
[offset
] = 0x70;
2890 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2891 /* ILLEGAL REQUEST */
2892 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2893 /* INVALID FIELD IN CDB */
2894 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
2896 case TCM_CHECK_CONDITION_ABORT_CMD
:
2898 buffer
[offset
] = 0x70;
2899 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2900 /* ABORTED COMMAND */
2901 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2902 /* BUS DEVICE RESET FUNCTION OCCURRED */
2903 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
2904 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
2906 case TCM_INCORRECT_AMOUNT_OF_DATA
:
2908 buffer
[offset
] = 0x70;
2909 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2910 /* ABORTED COMMAND */
2911 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2913 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
2914 /* NOT ENOUGH UNSOLICITED DATA */
2915 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
2917 case TCM_INVALID_CDB_FIELD
:
2919 buffer
[offset
] = 0x70;
2920 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2921 /* ILLEGAL REQUEST */
2922 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2923 /* INVALID FIELD IN CDB */
2924 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
2926 case TCM_INVALID_PARAMETER_LIST
:
2928 buffer
[offset
] = 0x70;
2929 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2930 /* ILLEGAL REQUEST */
2931 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2932 /* INVALID FIELD IN PARAMETER LIST */
2933 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
2935 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
2937 buffer
[offset
] = 0x70;
2938 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2939 /* ABORTED COMMAND */
2940 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2942 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
2943 /* UNEXPECTED_UNSOLICITED_DATA */
2944 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
2946 case TCM_SERVICE_CRC_ERROR
:
2948 buffer
[offset
] = 0x70;
2949 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2950 /* ABORTED COMMAND */
2951 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2952 /* PROTOCOL SERVICE CRC ERROR */
2953 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
2955 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
2957 case TCM_SNACK_REJECTED
:
2959 buffer
[offset
] = 0x70;
2960 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2961 /* ABORTED COMMAND */
2962 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
2964 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
2965 /* FAILED RETRANSMISSION REQUEST */
2966 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
2968 case TCM_WRITE_PROTECTED
:
2970 buffer
[offset
] = 0x70;
2971 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2973 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
2974 /* WRITE PROTECTED */
2975 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
2977 case TCM_ADDRESS_OUT_OF_RANGE
:
2979 buffer
[offset
] = 0x70;
2980 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2981 /* ILLEGAL REQUEST */
2982 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
2983 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2984 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x21;
2986 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
2988 buffer
[offset
] = 0x70;
2989 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
2990 /* UNIT ATTENTION */
2991 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
2992 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
2993 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
2994 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
2996 case TCM_CHECK_CONDITION_NOT_READY
:
2998 buffer
[offset
] = 0x70;
2999 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
3001 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
3002 transport_get_sense_codes(cmd
, &asc
, &ascq
);
3003 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
3004 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
3006 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
3009 buffer
[offset
] = 0x70;
3010 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
3011 /* ILLEGAL REQUEST */
3012 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
3013 /* LOGICAL UNIT COMMUNICATION FAILURE */
3014 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
3018 * This code uses linux/include/scsi/scsi.h SAM status codes!
3020 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
3022 * Automatically padded, this value is encoded in the fabric's
3023 * data_length response PDU containing the SCSI defined sense data.
3025 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
3028 return cmd
->se_tfo
->queue_status(cmd
);
3030 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
3032 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
3036 if (cmd
->transport_state
& CMD_T_ABORTED
) {
3038 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
3041 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3042 " status for CDB: 0x%02x ITT: 0x%08x\n",
3044 cmd
->se_tfo
->get_task_tag(cmd
));
3046 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
3047 cmd
->se_tfo
->queue_status(cmd
);
3052 EXPORT_SYMBOL(transport_check_aborted_status
);
3054 void transport_send_task_abort(struct se_cmd
*cmd
)
3056 unsigned long flags
;
3058 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3059 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
3060 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3063 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3066 * If there are still expected incoming fabric WRITEs, we wait
3067 * until until they have completed before sending a TASK_ABORTED
3068 * response. This response with TASK_ABORTED status will be
3069 * queued back to fabric module by transport_check_aborted_status().
3071 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3072 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
3073 cmd
->transport_state
|= CMD_T_ABORTED
;
3074 smp_mb__after_atomic_inc();
3077 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
3079 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3080 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
3081 cmd
->se_tfo
->get_task_tag(cmd
));
3083 cmd
->se_tfo
->queue_status(cmd
);
3086 static void target_tmr_work(struct work_struct
*work
)
3088 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3089 struct se_device
*dev
= cmd
->se_dev
;
3090 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
3093 switch (tmr
->function
) {
3094 case TMR_ABORT_TASK
:
3095 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
3097 case TMR_ABORT_TASK_SET
:
3099 case TMR_CLEAR_TASK_SET
:
3100 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
3103 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
3104 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
3105 TMR_FUNCTION_REJECTED
;
3107 case TMR_TARGET_WARM_RESET
:
3108 tmr
->response
= TMR_FUNCTION_REJECTED
;
3110 case TMR_TARGET_COLD_RESET
:
3111 tmr
->response
= TMR_FUNCTION_REJECTED
;
3114 pr_err("Uknown TMR function: 0x%02x.\n",
3116 tmr
->response
= TMR_FUNCTION_REJECTED
;
3120 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
3121 cmd
->se_tfo
->queue_tm_rsp(cmd
);
3123 transport_cmd_check_stop_to_fabric(cmd
);
3126 int transport_generic_handle_tmr(
3129 INIT_WORK(&cmd
->work
, target_tmr_work
);
3130 queue_work(cmd
->se_dev
->tmr_wq
, &cmd
->work
);
3133 EXPORT_SYMBOL(transport_generic_handle_tmr
);