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 int transport_generic_write_pending(struct se_cmd
*);
70 static int transport_processing_thread(void *param
);
71 static int __transport_execute_tasks(struct se_device
*dev
, struct se_cmd
*);
72 static void transport_complete_task_attr(struct se_cmd
*cmd
);
73 static void transport_handle_queue_full(struct se_cmd
*cmd
,
74 struct se_device
*dev
);
75 static int transport_generic_get_mem(struct se_cmd
*cmd
);
76 static void transport_put_cmd(struct se_cmd
*cmd
);
77 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
);
78 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
79 static void target_complete_ok_work(struct work_struct
*work
);
81 int init_se_kmem_caches(void)
83 se_sess_cache
= kmem_cache_create("se_sess_cache",
84 sizeof(struct se_session
), __alignof__(struct se_session
),
87 pr_err("kmem_cache_create() for struct se_session"
91 se_ua_cache
= kmem_cache_create("se_ua_cache",
92 sizeof(struct se_ua
), __alignof__(struct se_ua
),
95 pr_err("kmem_cache_create() for struct se_ua failed\n");
96 goto out_free_sess_cache
;
98 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
99 sizeof(struct t10_pr_registration
),
100 __alignof__(struct t10_pr_registration
), 0, NULL
);
101 if (!t10_pr_reg_cache
) {
102 pr_err("kmem_cache_create() for struct t10_pr_registration"
104 goto out_free_ua_cache
;
106 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
107 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
109 if (!t10_alua_lu_gp_cache
) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
112 goto out_free_pr_reg_cache
;
114 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
115 sizeof(struct t10_alua_lu_gp_member
),
116 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
117 if (!t10_alua_lu_gp_mem_cache
) {
118 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
120 goto out_free_lu_gp_cache
;
122 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
123 sizeof(struct t10_alua_tg_pt_gp
),
124 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
125 if (!t10_alua_tg_pt_gp_cache
) {
126 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
128 goto out_free_lu_gp_mem_cache
;
130 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
131 "t10_alua_tg_pt_gp_mem_cache",
132 sizeof(struct t10_alua_tg_pt_gp_member
),
133 __alignof__(struct t10_alua_tg_pt_gp_member
),
135 if (!t10_alua_tg_pt_gp_mem_cache
) {
136 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
138 goto out_free_tg_pt_gp_cache
;
141 target_completion_wq
= alloc_workqueue("target_completion",
143 if (!target_completion_wq
)
144 goto out_free_tg_pt_gp_mem_cache
;
148 out_free_tg_pt_gp_mem_cache
:
149 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
150 out_free_tg_pt_gp_cache
:
151 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
152 out_free_lu_gp_mem_cache
:
153 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
154 out_free_lu_gp_cache
:
155 kmem_cache_destroy(t10_alua_lu_gp_cache
);
156 out_free_pr_reg_cache
:
157 kmem_cache_destroy(t10_pr_reg_cache
);
159 kmem_cache_destroy(se_ua_cache
);
161 kmem_cache_destroy(se_sess_cache
);
166 void release_se_kmem_caches(void)
168 destroy_workqueue(target_completion_wq
);
169 kmem_cache_destroy(se_sess_cache
);
170 kmem_cache_destroy(se_ua_cache
);
171 kmem_cache_destroy(t10_pr_reg_cache
);
172 kmem_cache_destroy(t10_alua_lu_gp_cache
);
173 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
174 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
178 /* This code ensures unique mib indexes are handed out. */
179 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
180 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
183 * Allocate a new row index for the entry type specified
185 u32
scsi_get_new_index(scsi_index_t type
)
189 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
191 spin_lock(&scsi_mib_index_lock
);
192 new_index
= ++scsi_mib_index
[type
];
193 spin_unlock(&scsi_mib_index_lock
);
198 static void transport_init_queue_obj(struct se_queue_obj
*qobj
)
200 atomic_set(&qobj
->queue_cnt
, 0);
201 INIT_LIST_HEAD(&qobj
->qobj_list
);
202 init_waitqueue_head(&qobj
->thread_wq
);
203 spin_lock_init(&qobj
->cmd_queue_lock
);
206 void transport_subsystem_check_init(void)
210 if (sub_api_initialized
)
213 ret
= request_module("target_core_iblock");
215 pr_err("Unable to load target_core_iblock\n");
217 ret
= request_module("target_core_file");
219 pr_err("Unable to load target_core_file\n");
221 ret
= request_module("target_core_pscsi");
223 pr_err("Unable to load target_core_pscsi\n");
225 ret
= request_module("target_core_stgt");
227 pr_err("Unable to load target_core_stgt\n");
229 sub_api_initialized
= 1;
233 struct se_session
*transport_init_session(void)
235 struct se_session
*se_sess
;
237 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
239 pr_err("Unable to allocate struct se_session from"
241 return ERR_PTR(-ENOMEM
);
243 INIT_LIST_HEAD(&se_sess
->sess_list
);
244 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
245 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
246 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
247 spin_lock_init(&se_sess
->sess_cmd_lock
);
248 kref_init(&se_sess
->sess_kref
);
252 EXPORT_SYMBOL(transport_init_session
);
255 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
257 void __transport_register_session(
258 struct se_portal_group
*se_tpg
,
259 struct se_node_acl
*se_nacl
,
260 struct se_session
*se_sess
,
261 void *fabric_sess_ptr
)
263 unsigned char buf
[PR_REG_ISID_LEN
];
265 se_sess
->se_tpg
= se_tpg
;
266 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
268 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
270 * Only set for struct se_session's that will actually be moving I/O.
271 * eg: *NOT* discovery sessions.
275 * If the fabric module supports an ISID based TransportID,
276 * save this value in binary from the fabric I_T Nexus now.
278 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
279 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
280 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
281 &buf
[0], PR_REG_ISID_LEN
);
282 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
284 kref_get(&se_nacl
->acl_kref
);
286 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
288 * The se_nacl->nacl_sess pointer will be set to the
289 * last active I_T Nexus for each struct se_node_acl.
291 se_nacl
->nacl_sess
= se_sess
;
293 list_add_tail(&se_sess
->sess_acl_list
,
294 &se_nacl
->acl_sess_list
);
295 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
297 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
299 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
300 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
302 EXPORT_SYMBOL(__transport_register_session
);
304 void transport_register_session(
305 struct se_portal_group
*se_tpg
,
306 struct se_node_acl
*se_nacl
,
307 struct se_session
*se_sess
,
308 void *fabric_sess_ptr
)
312 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
313 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
314 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
316 EXPORT_SYMBOL(transport_register_session
);
318 static void target_release_session(struct kref
*kref
)
320 struct se_session
*se_sess
= container_of(kref
,
321 struct se_session
, sess_kref
);
322 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
324 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
327 void target_get_session(struct se_session
*se_sess
)
329 kref_get(&se_sess
->sess_kref
);
331 EXPORT_SYMBOL(target_get_session
);
333 void target_put_session(struct se_session
*se_sess
)
335 kref_put(&se_sess
->sess_kref
, target_release_session
);
337 EXPORT_SYMBOL(target_put_session
);
339 static void target_complete_nacl(struct kref
*kref
)
341 struct se_node_acl
*nacl
= container_of(kref
,
342 struct se_node_acl
, acl_kref
);
344 complete(&nacl
->acl_free_comp
);
347 void target_put_nacl(struct se_node_acl
*nacl
)
349 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
352 void transport_deregister_session_configfs(struct se_session
*se_sess
)
354 struct se_node_acl
*se_nacl
;
357 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
359 se_nacl
= se_sess
->se_node_acl
;
361 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
362 if (se_nacl
->acl_stop
== 0)
363 list_del(&se_sess
->sess_acl_list
);
365 * If the session list is empty, then clear the pointer.
366 * Otherwise, set the struct se_session pointer from the tail
367 * element of the per struct se_node_acl active session list.
369 if (list_empty(&se_nacl
->acl_sess_list
))
370 se_nacl
->nacl_sess
= NULL
;
372 se_nacl
->nacl_sess
= container_of(
373 se_nacl
->acl_sess_list
.prev
,
374 struct se_session
, sess_acl_list
);
376 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
379 EXPORT_SYMBOL(transport_deregister_session_configfs
);
381 void transport_free_session(struct se_session
*se_sess
)
383 kmem_cache_free(se_sess_cache
, se_sess
);
385 EXPORT_SYMBOL(transport_free_session
);
387 void transport_deregister_session(struct se_session
*se_sess
)
389 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
390 struct target_core_fabric_ops
*se_tfo
;
391 struct se_node_acl
*se_nacl
;
393 bool comp_nacl
= true;
396 transport_free_session(se_sess
);
399 se_tfo
= se_tpg
->se_tpg_tfo
;
401 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
402 list_del(&se_sess
->sess_list
);
403 se_sess
->se_tpg
= NULL
;
404 se_sess
->fabric_sess_ptr
= NULL
;
405 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
408 * Determine if we need to do extra work for this initiator node's
409 * struct se_node_acl if it had been previously dynamically generated.
411 se_nacl
= se_sess
->se_node_acl
;
413 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
414 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
415 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
416 list_del(&se_nacl
->acl_list
);
417 se_tpg
->num_node_acls
--;
418 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
419 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
420 core_free_device_list_for_node(se_nacl
, se_tpg
);
421 se_tfo
->tpg_release_fabric_acl(se_tpg
, se_nacl
);
424 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
427 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
429 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
430 se_tpg
->se_tpg_tfo
->get_fabric_name());
432 * If last kref is dropping now for an explict NodeACL, awake sleeping
433 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
436 if (se_nacl
&& comp_nacl
== true)
437 target_put_nacl(se_nacl
);
439 transport_free_session(se_sess
);
441 EXPORT_SYMBOL(transport_deregister_session
);
444 * Called with cmd->t_state_lock held.
446 static void target_remove_from_state_list(struct se_cmd
*cmd
)
448 struct se_device
*dev
= cmd
->se_dev
;
454 if (cmd
->transport_state
& CMD_T_BUSY
)
457 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
458 if (cmd
->state_active
) {
459 list_del(&cmd
->state_list
);
460 cmd
->state_active
= false;
462 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
465 /* transport_cmd_check_stop():
467 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
468 * 'transport_off = 2' determines if task_dev_state should be removed.
470 * A non-zero u8 t_state sets cmd->t_state.
471 * Returns 1 when command is stopped, else 0.
473 static int transport_cmd_check_stop(
480 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
482 * Determine if IOCTL context caller in requesting the stopping of this
483 * command for LUN shutdown purposes.
485 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
486 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
487 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
489 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
490 if (transport_off
== 2)
491 target_remove_from_state_list(cmd
);
492 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
494 complete(&cmd
->transport_lun_stop_comp
);
498 * Determine if frontend context caller is requesting the stopping of
499 * this command for frontend exceptions.
501 if (cmd
->transport_state
& CMD_T_STOP
) {
502 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
504 cmd
->se_tfo
->get_task_tag(cmd
));
506 if (transport_off
== 2)
507 target_remove_from_state_list(cmd
);
510 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
513 if (transport_off
== 2)
515 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
517 complete(&cmd
->t_transport_stop_comp
);
521 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
522 if (transport_off
== 2) {
523 target_remove_from_state_list(cmd
);
525 * Clear struct se_cmd->se_lun before the transport_off == 2
526 * handoff to fabric module.
530 * Some fabric modules like tcm_loop can release
531 * their internally allocated I/O reference now and
534 * Fabric modules are expected to return '1' here if the
535 * se_cmd being passed is released at this point,
536 * or zero if not being released.
538 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
539 spin_unlock_irqrestore(
540 &cmd
->t_state_lock
, flags
);
542 return cmd
->se_tfo
->check_stop_free(cmd
);
545 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
549 cmd
->t_state
= t_state
;
550 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
555 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
557 return transport_cmd_check_stop(cmd
, 2, 0);
560 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
562 struct se_lun
*lun
= cmd
->se_lun
;
568 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
569 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
570 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
571 target_remove_from_state_list(cmd
);
573 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
575 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
576 if (!list_empty(&cmd
->se_lun_node
))
577 list_del_init(&cmd
->se_lun_node
);
578 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
581 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
583 if (!(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
584 transport_lun_remove_cmd(cmd
);
586 if (transport_cmd_check_stop_to_fabric(cmd
))
589 transport_remove_cmd_from_queue(cmd
);
590 transport_put_cmd(cmd
);
594 static void transport_add_cmd_to_queue(struct se_cmd
*cmd
, int t_state
,
597 struct se_device
*dev
= cmd
->se_dev
;
598 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
602 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
603 cmd
->t_state
= t_state
;
604 cmd
->transport_state
|= CMD_T_ACTIVE
;
605 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
608 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
610 /* If the cmd is already on the list, remove it before we add it */
611 if (!list_empty(&cmd
->se_queue_node
))
612 list_del(&cmd
->se_queue_node
);
614 atomic_inc(&qobj
->queue_cnt
);
617 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
619 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
620 cmd
->transport_state
|= CMD_T_QUEUED
;
621 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
623 wake_up_interruptible(&qobj
->thread_wq
);
626 static struct se_cmd
*
627 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
632 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
633 if (list_empty(&qobj
->qobj_list
)) {
634 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
637 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
639 cmd
->transport_state
&= ~CMD_T_QUEUED
;
640 list_del_init(&cmd
->se_queue_node
);
641 atomic_dec(&qobj
->queue_cnt
);
642 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
647 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
)
649 struct se_queue_obj
*qobj
= &cmd
->se_dev
->dev_queue_obj
;
652 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
653 if (!(cmd
->transport_state
& CMD_T_QUEUED
)) {
654 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
657 cmd
->transport_state
&= ~CMD_T_QUEUED
;
658 atomic_dec(&qobj
->queue_cnt
);
659 list_del_init(&cmd
->se_queue_node
);
660 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
663 static void target_complete_failure_work(struct work_struct
*work
)
665 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
667 transport_generic_request_failure(cmd
);
670 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
672 struct se_device
*dev
= cmd
->se_dev
;
673 int success
= scsi_status
== GOOD
;
676 cmd
->scsi_status
= scsi_status
;
679 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
680 cmd
->transport_state
&= ~CMD_T_BUSY
;
682 if (dev
&& dev
->transport
->transport_complete
) {
683 if (dev
->transport
->transport_complete(cmd
,
684 cmd
->t_data_sg
) != 0) {
685 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
691 * See if we are waiting to complete for an exception condition.
693 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
694 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
695 complete(&cmd
->task_stop_comp
);
700 cmd
->transport_state
|= CMD_T_FAILED
;
703 * Check for case where an explict ABORT_TASK has been received
704 * and transport_wait_for_tasks() will be waiting for completion..
706 if (cmd
->transport_state
& CMD_T_ABORTED
&&
707 cmd
->transport_state
& CMD_T_STOP
) {
708 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
709 complete(&cmd
->t_transport_stop_comp
);
711 } else if (cmd
->transport_state
& CMD_T_FAILED
) {
712 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
713 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
715 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
718 cmd
->t_state
= TRANSPORT_COMPLETE
;
719 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
720 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
722 queue_work(target_completion_wq
, &cmd
->work
);
724 EXPORT_SYMBOL(target_complete_cmd
);
726 static void target_add_to_state_list(struct se_cmd
*cmd
)
728 struct se_device
*dev
= cmd
->se_dev
;
731 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
732 if (!cmd
->state_active
) {
733 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
734 cmd
->state_active
= true;
736 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
739 static void __target_add_to_execute_list(struct se_cmd
*cmd
)
741 struct se_device
*dev
= cmd
->se_dev
;
742 bool head_of_queue
= false;
744 if (!list_empty(&cmd
->execute_list
))
747 if (dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
&&
748 cmd
->sam_task_attr
== MSG_HEAD_TAG
)
749 head_of_queue
= true;
752 list_add(&cmd
->execute_list
, &dev
->execute_list
);
754 list_add_tail(&cmd
->execute_list
, &dev
->execute_list
);
756 atomic_inc(&dev
->execute_tasks
);
758 if (cmd
->state_active
)
762 list_add(&cmd
->state_list
, &dev
->state_list
);
764 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
766 cmd
->state_active
= true;
769 static void target_add_to_execute_list(struct se_cmd
*cmd
)
772 struct se_device
*dev
= cmd
->se_dev
;
774 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
775 __target_add_to_execute_list(cmd
);
776 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
779 void __target_remove_from_execute_list(struct se_cmd
*cmd
)
781 list_del_init(&cmd
->execute_list
);
782 atomic_dec(&cmd
->se_dev
->execute_tasks
);
785 static void target_remove_from_execute_list(struct se_cmd
*cmd
)
787 struct se_device
*dev
= cmd
->se_dev
;
790 if (WARN_ON(list_empty(&cmd
->execute_list
)))
793 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
794 __target_remove_from_execute_list(cmd
);
795 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
799 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
802 static void target_qf_do_work(struct work_struct
*work
)
804 struct se_device
*dev
= container_of(work
, struct se_device
,
806 LIST_HEAD(qf_cmd_list
);
807 struct se_cmd
*cmd
, *cmd_tmp
;
809 spin_lock_irq(&dev
->qf_cmd_lock
);
810 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
811 spin_unlock_irq(&dev
->qf_cmd_lock
);
813 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
814 list_del(&cmd
->se_qf_node
);
815 atomic_dec(&dev
->dev_qf_count
);
816 smp_mb__after_atomic_dec();
818 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
819 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
820 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
821 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
824 transport_add_cmd_to_queue(cmd
, cmd
->t_state
, true);
828 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
830 switch (cmd
->data_direction
) {
833 case DMA_FROM_DEVICE
:
837 case DMA_BIDIRECTIONAL
:
846 void transport_dump_dev_state(
847 struct se_device
*dev
,
851 *bl
+= sprintf(b
+ *bl
, "Status: ");
852 switch (dev
->dev_status
) {
853 case TRANSPORT_DEVICE_ACTIVATED
:
854 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
856 case TRANSPORT_DEVICE_DEACTIVATED
:
857 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
859 case TRANSPORT_DEVICE_SHUTDOWN
:
860 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
862 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
863 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
864 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
867 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
871 *bl
+= sprintf(b
+ *bl
, " Execute/Max Queue Depth: %d/%d",
872 atomic_read(&dev
->execute_tasks
), dev
->queue_depth
);
873 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u HwMaxSectors: %u\n",
874 dev
->se_sub_dev
->se_dev_attrib
.block_size
,
875 dev
->se_sub_dev
->se_dev_attrib
.hw_max_sectors
);
876 *bl
+= sprintf(b
+ *bl
, " ");
879 void transport_dump_vpd_proto_id(
881 unsigned char *p_buf
,
884 unsigned char buf
[VPD_TMP_BUF_SIZE
];
887 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
888 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
890 switch (vpd
->protocol_identifier
) {
892 sprintf(buf
+len
, "Fibre Channel\n");
895 sprintf(buf
+len
, "Parallel SCSI\n");
898 sprintf(buf
+len
, "SSA\n");
901 sprintf(buf
+len
, "IEEE 1394\n");
904 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
908 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
911 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
914 sprintf(buf
+len
, "Automation/Drive Interface Transport"
918 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
921 sprintf(buf
+len
, "Unknown 0x%02x\n",
922 vpd
->protocol_identifier
);
927 strncpy(p_buf
, buf
, p_buf_len
);
933 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
936 * Check if the Protocol Identifier Valid (PIV) bit is set..
938 * from spc3r23.pdf section 7.5.1
940 if (page_83
[1] & 0x80) {
941 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
942 vpd
->protocol_identifier_set
= 1;
943 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
946 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
948 int transport_dump_vpd_assoc(
950 unsigned char *p_buf
,
953 unsigned char buf
[VPD_TMP_BUF_SIZE
];
957 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
958 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
960 switch (vpd
->association
) {
962 sprintf(buf
+len
, "addressed logical unit\n");
965 sprintf(buf
+len
, "target port\n");
968 sprintf(buf
+len
, "SCSI target device\n");
971 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
977 strncpy(p_buf
, buf
, p_buf_len
);
984 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
987 * The VPD identification association..
989 * from spc3r23.pdf Section 7.6.3.1 Table 297
991 vpd
->association
= (page_83
[1] & 0x30);
992 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
994 EXPORT_SYMBOL(transport_set_vpd_assoc
);
996 int transport_dump_vpd_ident_type(
998 unsigned char *p_buf
,
1001 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1005 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1006 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1008 switch (vpd
->device_identifier_type
) {
1010 sprintf(buf
+len
, "Vendor specific\n");
1013 sprintf(buf
+len
, "T10 Vendor ID based\n");
1016 sprintf(buf
+len
, "EUI-64 based\n");
1019 sprintf(buf
+len
, "NAA\n");
1022 sprintf(buf
+len
, "Relative target port identifier\n");
1025 sprintf(buf
+len
, "SCSI name string\n");
1028 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1029 vpd
->device_identifier_type
);
1035 if (p_buf_len
< strlen(buf
)+1)
1037 strncpy(p_buf
, buf
, p_buf_len
);
1039 pr_debug("%s", buf
);
1045 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1048 * The VPD identifier type..
1050 * from spc3r23.pdf Section 7.6.3.1 Table 298
1052 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1053 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1055 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1057 int transport_dump_vpd_ident(
1058 struct t10_vpd
*vpd
,
1059 unsigned char *p_buf
,
1062 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1065 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1067 switch (vpd
->device_identifier_code_set
) {
1068 case 0x01: /* Binary */
1069 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1070 &vpd
->device_identifier
[0]);
1072 case 0x02: /* ASCII */
1073 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1074 &vpd
->device_identifier
[0]);
1076 case 0x03: /* UTF-8 */
1077 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1078 &vpd
->device_identifier
[0]);
1081 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1082 " 0x%02x", vpd
->device_identifier_code_set
);
1088 strncpy(p_buf
, buf
, p_buf_len
);
1090 pr_debug("%s", buf
);
1096 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1098 static const char hex_str
[] = "0123456789abcdef";
1099 int j
= 0, i
= 4; /* offset to start of the identifer */
1102 * The VPD Code Set (encoding)
1104 * from spc3r23.pdf Section 7.6.3.1 Table 296
1106 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1107 switch (vpd
->device_identifier_code_set
) {
1108 case 0x01: /* Binary */
1109 vpd
->device_identifier
[j
++] =
1110 hex_str
[vpd
->device_identifier_type
];
1111 while (i
< (4 + page_83
[3])) {
1112 vpd
->device_identifier
[j
++] =
1113 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1114 vpd
->device_identifier
[j
++] =
1115 hex_str
[page_83
[i
] & 0x0f];
1119 case 0x02: /* ASCII */
1120 case 0x03: /* UTF-8 */
1121 while (i
< (4 + page_83
[3]))
1122 vpd
->device_identifier
[j
++] = page_83
[i
++];
1128 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1130 EXPORT_SYMBOL(transport_set_vpd_ident
);
1132 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1135 * If this device is from Target_Core_Mod/pSCSI, disable the
1136 * SAM Task Attribute emulation.
1138 * This is currently not available in upsream Linux/SCSI Target
1139 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1141 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1142 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1146 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1147 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1148 " device\n", dev
->transport
->name
,
1149 dev
->transport
->get_device_rev(dev
));
1152 static void scsi_dump_inquiry(struct se_device
*dev
)
1154 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1158 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1160 for (i
= 0; i
< 8; i
++)
1161 if (wwn
->vendor
[i
] >= 0x20)
1162 buf
[i
] = wwn
->vendor
[i
];
1166 pr_debug(" Vendor: %s\n", buf
);
1168 for (i
= 0; i
< 16; i
++)
1169 if (wwn
->model
[i
] >= 0x20)
1170 buf
[i
] = wwn
->model
[i
];
1174 pr_debug(" Model: %s\n", buf
);
1176 for (i
= 0; i
< 4; i
++)
1177 if (wwn
->revision
[i
] >= 0x20)
1178 buf
[i
] = wwn
->revision
[i
];
1182 pr_debug(" Revision: %s\n", buf
);
1184 device_type
= dev
->transport
->get_device_type(dev
);
1185 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1186 pr_debug(" ANSI SCSI revision: %02x\n",
1187 dev
->transport
->get_device_rev(dev
));
1190 struct se_device
*transport_add_device_to_core_hba(
1192 struct se_subsystem_api
*transport
,
1193 struct se_subsystem_dev
*se_dev
,
1195 void *transport_dev
,
1196 struct se_dev_limits
*dev_limits
,
1197 const char *inquiry_prod
,
1198 const char *inquiry_rev
)
1201 struct se_device
*dev
;
1203 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1205 pr_err("Unable to allocate memory for se_dev_t\n");
1209 transport_init_queue_obj(&dev
->dev_queue_obj
);
1210 dev
->dev_flags
= device_flags
;
1211 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1212 dev
->dev_ptr
= transport_dev
;
1214 dev
->se_sub_dev
= se_dev
;
1215 dev
->transport
= transport
;
1216 INIT_LIST_HEAD(&dev
->dev_list
);
1217 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1218 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1219 INIT_LIST_HEAD(&dev
->execute_list
);
1220 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1221 INIT_LIST_HEAD(&dev
->state_list
);
1222 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1223 spin_lock_init(&dev
->execute_task_lock
);
1224 spin_lock_init(&dev
->delayed_cmd_lock
);
1225 spin_lock_init(&dev
->dev_reservation_lock
);
1226 spin_lock_init(&dev
->dev_status_lock
);
1227 spin_lock_init(&dev
->se_port_lock
);
1228 spin_lock_init(&dev
->se_tmr_lock
);
1229 spin_lock_init(&dev
->qf_cmd_lock
);
1230 atomic_set(&dev
->dev_ordered_id
, 0);
1232 se_dev_set_default_attribs(dev
, dev_limits
);
1234 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1235 dev
->creation_time
= get_jiffies_64();
1236 spin_lock_init(&dev
->stats_lock
);
1238 spin_lock(&hba
->device_lock
);
1239 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1241 spin_unlock(&hba
->device_lock
);
1243 * Setup the SAM Task Attribute emulation for struct se_device
1245 core_setup_task_attr_emulation(dev
);
1247 * Force PR and ALUA passthrough emulation with internal object use.
1249 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1251 * Setup the Reservations infrastructure for struct se_device
1253 core_setup_reservations(dev
, force_pt
);
1255 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1257 if (core_setup_alua(dev
, force_pt
) < 0)
1261 * Startup the struct se_device processing thread
1263 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1264 "LIO_%s", dev
->transport
->name
);
1265 if (IS_ERR(dev
->process_thread
)) {
1266 pr_err("Unable to create kthread: LIO_%s\n",
1267 dev
->transport
->name
);
1271 * Setup work_queue for QUEUE_FULL
1273 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1275 * Preload the initial INQUIRY const values if we are doing
1276 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1277 * passthrough because this is being provided by the backend LLD.
1278 * This is required so that transport_get_inquiry() copies these
1279 * originals once back into DEV_T10_WWN(dev) for the virtual device
1282 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1283 if (!inquiry_prod
|| !inquiry_rev
) {
1284 pr_err("All non TCM/pSCSI plugins require"
1285 " INQUIRY consts\n");
1289 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1290 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1291 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1293 scsi_dump_inquiry(dev
);
1297 kthread_stop(dev
->process_thread
);
1299 spin_lock(&hba
->device_lock
);
1300 list_del(&dev
->dev_list
);
1302 spin_unlock(&hba
->device_lock
);
1304 se_release_vpd_for_dev(dev
);
1310 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1312 /* transport_generic_prepare_cdb():
1314 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1315 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1316 * The point of this is since we are mapping iSCSI LUNs to
1317 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1318 * devices and HBAs for a loop.
1320 static inline void transport_generic_prepare_cdb(
1324 case READ_10
: /* SBC - RDProtect */
1325 case READ_12
: /* SBC - RDProtect */
1326 case READ_16
: /* SBC - RDProtect */
1327 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1328 case VERIFY
: /* SBC - VRProtect */
1329 case VERIFY_16
: /* SBC - VRProtect */
1330 case WRITE_VERIFY
: /* SBC - VRProtect */
1331 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1332 case MAINTENANCE_IN
: /* SPC - Parameter Data Format for SA RTPG */
1335 cdb
[1] &= 0x1f; /* clear logical unit number */
1340 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1343 * Used by fabric modules containing a local struct se_cmd within their
1344 * fabric dependent per I/O descriptor.
1346 void transport_init_se_cmd(
1348 struct target_core_fabric_ops
*tfo
,
1349 struct se_session
*se_sess
,
1353 unsigned char *sense_buffer
)
1355 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1356 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1357 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1358 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1359 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1360 INIT_LIST_HEAD(&cmd
->execute_list
);
1361 INIT_LIST_HEAD(&cmd
->state_list
);
1362 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1363 init_completion(&cmd
->transport_lun_stop_comp
);
1364 init_completion(&cmd
->t_transport_stop_comp
);
1365 init_completion(&cmd
->cmd_wait_comp
);
1366 init_completion(&cmd
->task_stop_comp
);
1367 spin_lock_init(&cmd
->t_state_lock
);
1368 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1371 cmd
->se_sess
= se_sess
;
1372 cmd
->data_length
= data_length
;
1373 cmd
->data_direction
= data_direction
;
1374 cmd
->sam_task_attr
= task_attr
;
1375 cmd
->sense_buffer
= sense_buffer
;
1377 cmd
->state_active
= false;
1379 EXPORT_SYMBOL(transport_init_se_cmd
);
1381 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1384 * Check if SAM Task Attribute emulation is enabled for this
1385 * struct se_device storage object
1387 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1390 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1391 pr_debug("SAM Task Attribute ACA"
1392 " emulation is not supported\n");
1396 * Used to determine when ORDERED commands should go from
1397 * Dormant to Active status.
1399 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1400 smp_mb__after_atomic_inc();
1401 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1402 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1403 cmd
->se_dev
->transport
->name
);
1407 /* target_setup_cmd_from_cdb():
1409 * Called from fabric RX Thread.
1411 int target_setup_cmd_from_cdb(
1417 transport_generic_prepare_cdb(cdb
);
1419 * Ensure that the received CDB is less than the max (252 + 8) bytes
1420 * for VARIABLE_LENGTH_CMD
1422 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1423 pr_err("Received SCSI CDB with command_size: %d that"
1424 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1425 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1426 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1427 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1431 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1432 * allocate the additional extended CDB buffer now.. Otherwise
1433 * setup the pointer from __t_task_cdb to t_task_cdb.
1435 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1436 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1438 if (!cmd
->t_task_cdb
) {
1439 pr_err("Unable to allocate cmd->t_task_cdb"
1440 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1441 scsi_command_size(cdb
),
1442 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1443 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1444 cmd
->scsi_sense_reason
=
1445 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1449 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1451 * Copy the original CDB into cmd->
1453 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1455 * Setup the received CDB based on SCSI defined opcodes and
1456 * perform unit attention, persistent reservations and ALUA
1457 * checks for virtual device backends. The cmd->t_task_cdb
1458 * pointer is expected to be setup before we reach this point.
1460 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1464 * Check for SAM Task Attribute Emulation
1466 if (transport_check_alloc_task_attr(cmd
) < 0) {
1467 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1468 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1471 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1472 if (cmd
->se_lun
->lun_sep
)
1473 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1474 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1477 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1480 * Used by fabric module frontends to queue tasks directly.
1481 * Many only be used from process context only
1483 int transport_handle_cdb_direct(
1490 pr_err("cmd->se_lun is NULL\n");
1493 if (in_interrupt()) {
1495 pr_err("transport_generic_handle_cdb cannot be called"
1496 " from interrupt context\n");
1500 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1501 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1502 * in existing usage to ensure that outstanding descriptors are handled
1503 * correctly during shutdown via transport_wait_for_tasks()
1505 * Also, we don't take cmd->t_state_lock here as we only expect
1506 * this to be called for initial descriptor submission.
1508 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1509 cmd
->transport_state
|= CMD_T_ACTIVE
;
1512 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1513 * so follow TRANSPORT_NEW_CMD processing thread context usage
1514 * and call transport_generic_request_failure() if necessary..
1516 ret
= transport_generic_new_cmd(cmd
);
1518 transport_generic_request_failure(cmd
);
1522 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1525 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1527 * @se_cmd: command descriptor to submit
1528 * @se_sess: associated se_sess for endpoint
1529 * @cdb: pointer to SCSI CDB
1530 * @sense: pointer to SCSI sense buffer
1531 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1532 * @data_length: fabric expected data transfer length
1533 * @task_addr: SAM task attribute
1534 * @data_dir: DMA data direction
1535 * @flags: flags for command submission from target_sc_flags_tables
1537 * This may only be called from process context, and also currently
1538 * assumes internal allocation of fabric payload buffer by target-core.
1540 void target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1541 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1542 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1544 struct se_portal_group
*se_tpg
;
1547 se_tpg
= se_sess
->se_tpg
;
1549 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1550 BUG_ON(in_interrupt());
1552 * Initialize se_cmd for target operation. From this point
1553 * exceptions are handled by sending exception status via
1554 * target_core_fabric_ops->queue_status() callback
1556 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1557 data_length
, data_dir
, task_attr
, sense
);
1558 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1559 se_cmd
->unknown_data_length
= 1;
1561 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1562 * se_sess->sess_cmd_list. A second kref_get here is necessary
1563 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1564 * kref_put() to happen during fabric packet acknowledgement.
1566 target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1568 * Signal bidirectional data payloads to target-core
1570 if (flags
& TARGET_SCF_BIDI_OP
)
1571 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1573 * Locate se_lun pointer and attach it to struct se_cmd
1575 if (transport_lookup_cmd_lun(se_cmd
, unpacked_lun
) < 0) {
1576 transport_send_check_condition_and_sense(se_cmd
,
1577 se_cmd
->scsi_sense_reason
, 0);
1578 target_put_sess_cmd(se_sess
, se_cmd
);
1582 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1583 * allocate the necessary tasks to complete the received CDB+data
1585 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1587 transport_generic_request_failure(se_cmd
);
1592 * Check if we need to delay processing because of ALUA
1593 * Active/NonOptimized primary access state..
1595 core_alua_check_nonop_delay(se_cmd
);
1598 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1599 * for immediate execution of READs, otherwise wait for
1600 * transport_generic_handle_data() to be called for WRITEs
1601 * when fabric has filled the incoming buffer.
1603 transport_handle_cdb_direct(se_cmd
);
1606 EXPORT_SYMBOL(target_submit_cmd
);
1608 static void target_complete_tmr_failure(struct work_struct
*work
)
1610 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1612 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1613 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1614 transport_generic_free_cmd(se_cmd
, 0);
1618 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1621 * @se_cmd: command descriptor to submit
1622 * @se_sess: associated se_sess for endpoint
1623 * @sense: pointer to SCSI sense buffer
1624 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1625 * @fabric_context: fabric context for TMR req
1626 * @tm_type: Type of TM request
1627 * @gfp: gfp type for caller
1628 * @tag: referenced task tag for TMR_ABORT_TASK
1629 * @flags: submit cmd flags
1631 * Callable from all contexts.
1634 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1635 unsigned char *sense
, u32 unpacked_lun
,
1636 void *fabric_tmr_ptr
, unsigned char tm_type
,
1637 gfp_t gfp
, unsigned int tag
, int flags
)
1639 struct se_portal_group
*se_tpg
;
1642 se_tpg
= se_sess
->se_tpg
;
1645 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1646 0, DMA_NONE
, MSG_SIMPLE_TAG
, sense
);
1648 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1649 * allocation failure.
1651 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1655 if (tm_type
== TMR_ABORT_TASK
)
1656 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1658 /* See target_submit_cmd for commentary */
1659 target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1661 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1664 * For callback during failure handling, push this work off
1665 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1667 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1668 schedule_work(&se_cmd
->work
);
1671 transport_generic_handle_tmr(se_cmd
);
1674 EXPORT_SYMBOL(target_submit_tmr
);
1677 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1678 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1679 * complete setup in TCM process context w/ TFO->new_cmd_map().
1681 int transport_generic_handle_cdb_map(
1686 pr_err("cmd->se_lun is NULL\n");
1690 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
, false);
1693 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1695 /* transport_generic_handle_data():
1699 int transport_generic_handle_data(
1703 * For the software fabric case, then we assume the nexus is being
1704 * failed/shutdown when signals are pending from the kthread context
1705 * caller, so we return a failure. For the HW target mode case running
1706 * in interrupt code, the signal_pending() check is skipped.
1708 if (!in_interrupt() && signal_pending(current
))
1711 * If the received CDB has aleady been ABORTED by the generic
1712 * target engine, we now call transport_check_aborted_status()
1713 * to queue any delated TASK_ABORTED status for the received CDB to the
1714 * fabric module as we are expecting no further incoming DATA OUT
1715 * sequences at this point.
1717 if (transport_check_aborted_status(cmd
, 1) != 0)
1720 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
, false);
1723 EXPORT_SYMBOL(transport_generic_handle_data
);
1725 /* transport_generic_handle_tmr():
1729 int transport_generic_handle_tmr(
1732 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
, false);
1735 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1738 * If the cmd is active, request it to be stopped and sleep until it
1741 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1743 bool was_active
= false;
1745 if (cmd
->transport_state
& CMD_T_BUSY
) {
1746 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1747 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1749 pr_debug("cmd %p waiting to complete\n", cmd
);
1750 wait_for_completion(&cmd
->task_stop_comp
);
1751 pr_debug("cmd %p stopped successfully\n", cmd
);
1753 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1754 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1755 cmd
->transport_state
&= ~CMD_T_BUSY
;
1763 * Handle SAM-esque emulation for generic transport request failures.
1765 void transport_generic_request_failure(struct se_cmd
*cmd
)
1769 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1770 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1771 cmd
->t_task_cdb
[0]);
1772 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1773 cmd
->se_tfo
->get_cmd_state(cmd
),
1774 cmd
->t_state
, cmd
->scsi_sense_reason
);
1775 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1776 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1777 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1778 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1781 * For SAM Task Attribute emulation for failed struct se_cmd
1783 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1784 transport_complete_task_attr(cmd
);
1786 switch (cmd
->scsi_sense_reason
) {
1787 case TCM_NON_EXISTENT_LUN
:
1788 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1789 case TCM_INVALID_CDB_FIELD
:
1790 case TCM_INVALID_PARAMETER_LIST
:
1791 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1792 case TCM_UNKNOWN_MODE_PAGE
:
1793 case TCM_WRITE_PROTECTED
:
1794 case TCM_CHECK_CONDITION_ABORT_CMD
:
1795 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1796 case TCM_CHECK_CONDITION_NOT_READY
:
1798 case TCM_RESERVATION_CONFLICT
:
1800 * No SENSE Data payload for this case, set SCSI Status
1801 * and queue the response to $FABRIC_MOD.
1803 * Uses linux/include/scsi/scsi.h SAM status codes defs
1805 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1807 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1808 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1811 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1814 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1815 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1816 cmd
->orig_fe_lun
, 0x2C,
1817 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1819 ret
= cmd
->se_tfo
->queue_status(cmd
);
1820 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1824 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1825 cmd
->t_task_cdb
[0], cmd
->scsi_sense_reason
);
1826 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1830 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1831 * make the call to transport_send_check_condition_and_sense()
1832 * directly. Otherwise expect the fabric to make the call to
1833 * transport_send_check_condition_and_sense() after handling
1834 * possible unsoliticied write data payloads.
1836 ret
= transport_send_check_condition_and_sense(cmd
,
1837 cmd
->scsi_sense_reason
, 0);
1838 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1842 transport_lun_remove_cmd(cmd
);
1843 if (!transport_cmd_check_stop_to_fabric(cmd
))
1848 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1849 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1851 EXPORT_SYMBOL(transport_generic_request_failure
);
1853 static inline u32
transport_lba_21(unsigned char *cdb
)
1855 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
1858 static inline u32
transport_lba_32(unsigned char *cdb
)
1860 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1863 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
1865 unsigned int __v1
, __v2
;
1867 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1868 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1870 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1874 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1876 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
1878 unsigned int __v1
, __v2
;
1880 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
1881 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
1883 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1886 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
1888 unsigned long flags
;
1890 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
1891 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1892 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
1896 * Called from Fabric Module context from transport_execute_tasks()
1898 * The return of this function determins if the tasks from struct se_cmd
1899 * get added to the execution queue in transport_execute_tasks(),
1900 * or are added to the delayed or ordered lists here.
1902 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
1904 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1907 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1908 * to allow the passed struct se_cmd list of tasks to the front of the list.
1910 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1911 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1912 " 0x%02x, se_ordered_id: %u\n",
1914 cmd
->se_ordered_id
);
1916 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1917 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
1918 smp_mb__after_atomic_inc();
1920 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1921 " list, se_ordered_id: %u\n",
1923 cmd
->se_ordered_id
);
1925 * Add ORDERED command to tail of execution queue if
1926 * no other older commands exist that need to be
1929 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
1933 * For SIMPLE and UNTAGGED Task Attribute commands
1935 atomic_inc(&cmd
->se_dev
->simple_cmds
);
1936 smp_mb__after_atomic_inc();
1939 * Otherwise if one or more outstanding ORDERED task attribute exist,
1940 * add the dormant task(s) built for the passed struct se_cmd to the
1941 * execution queue and become in Active state for this struct se_device.
1943 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
1945 * Otherwise, add cmd w/ tasks to delayed cmd queue that
1946 * will be drained upon completion of HEAD_OF_QUEUE task.
1948 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
1949 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
1950 list_add_tail(&cmd
->se_delayed_node
,
1951 &cmd
->se_dev
->delayed_cmd_list
);
1952 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
1954 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1955 " delayed CMD list, se_ordered_id: %u\n",
1956 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1957 cmd
->se_ordered_id
);
1959 * Return zero to let transport_execute_tasks() know
1960 * not to add the delayed tasks to the execution list.
1965 * Otherwise, no ORDERED task attributes exist..
1971 * Called from fabric module context in transport_generic_new_cmd() and
1972 * transport_generic_process_write()
1974 static void transport_execute_tasks(struct se_cmd
*cmd
)
1977 struct se_device
*se_dev
= cmd
->se_dev
;
1979 * Call transport_cmd_check_stop() to see if a fabric exception
1980 * has occurred that prevents execution.
1982 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
1984 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
1985 * attribute for the tasks of the received struct se_cmd CDB
1987 add_tasks
= transport_execute_task_attr(cmd
);
1989 __transport_execute_tasks(se_dev
, cmd
);
1993 __transport_execute_tasks(se_dev
, NULL
);
1996 static int __transport_execute_tasks(struct se_device
*dev
, struct se_cmd
*new_cmd
)
1999 struct se_cmd
*cmd
= NULL
;
2000 unsigned long flags
;
2003 spin_lock_irq(&dev
->execute_task_lock
);
2004 if (new_cmd
!= NULL
)
2005 __target_add_to_execute_list(new_cmd
);
2007 if (list_empty(&dev
->execute_list
)) {
2008 spin_unlock_irq(&dev
->execute_task_lock
);
2011 cmd
= list_first_entry(&dev
->execute_list
, struct se_cmd
, execute_list
);
2012 __target_remove_from_execute_list(cmd
);
2013 spin_unlock_irq(&dev
->execute_task_lock
);
2015 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2016 cmd
->transport_state
|= CMD_T_BUSY
;
2017 cmd
->transport_state
|= CMD_T_SENT
;
2019 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2021 if (cmd
->execute_cmd
)
2022 error
= cmd
->execute_cmd(cmd
);
2024 error
= dev
->transport
->execute_cmd(cmd
, cmd
->t_data_sg
,
2025 cmd
->t_data_nents
, cmd
->data_direction
);
2029 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2030 cmd
->transport_state
&= ~CMD_T_BUSY
;
2031 cmd
->transport_state
&= ~CMD_T_SENT
;
2032 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2034 transport_generic_request_failure(cmd
);
2043 static inline u32
transport_get_sectors_6(
2048 struct se_device
*dev
= cmd
->se_dev
;
2051 * Assume TYPE_DISK for non struct se_device objects.
2052 * Use 8-bit sector value.
2058 * Use 24-bit allocation length for TYPE_TAPE.
2060 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2061 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2064 * Everything else assume TYPE_DISK Sector CDB location.
2065 * Use 8-bit sector value. SBC-3 says:
2067 * A TRANSFER LENGTH field set to zero specifies that 256
2068 * logical blocks shall be written. Any other value
2069 * specifies the number of logical blocks that shall be
2073 return cdb
[4] ? : 256;
2076 static inline u32
transport_get_sectors_10(
2081 struct se_device
*dev
= cmd
->se_dev
;
2084 * Assume TYPE_DISK for non struct se_device objects.
2085 * Use 16-bit sector value.
2091 * XXX_10 is not defined in SSC, throw an exception
2093 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2099 * Everything else assume TYPE_DISK Sector CDB location.
2100 * Use 16-bit sector value.
2103 return (u32
)(cdb
[7] << 8) + cdb
[8];
2106 static inline u32
transport_get_sectors_12(
2111 struct se_device
*dev
= cmd
->se_dev
;
2114 * Assume TYPE_DISK for non struct se_device objects.
2115 * Use 32-bit sector value.
2121 * XXX_12 is not defined in SSC, throw an exception
2123 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2129 * Everything else assume TYPE_DISK Sector CDB location.
2130 * Use 32-bit sector value.
2133 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2136 static inline u32
transport_get_sectors_16(
2141 struct se_device
*dev
= cmd
->se_dev
;
2144 * Assume TYPE_DISK for non struct se_device objects.
2145 * Use 32-bit sector value.
2151 * Use 24-bit allocation length for TYPE_TAPE.
2153 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2154 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2157 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2158 (cdb
[12] << 8) + cdb
[13];
2162 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2164 static inline u32
transport_get_sectors_32(
2170 * Assume TYPE_DISK for non struct se_device objects.
2171 * Use 32-bit sector value.
2173 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2174 (cdb
[30] << 8) + cdb
[31];
2178 static inline u32
transport_get_size(
2183 struct se_device
*dev
= cmd
->se_dev
;
2185 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2186 if (cdb
[1] & 1) { /* sectors */
2187 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2192 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2193 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
,
2194 sectors
, dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2195 dev
->transport
->name
);
2197 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2200 static void transport_xor_callback(struct se_cmd
*cmd
)
2202 unsigned char *buf
, *addr
;
2203 struct scatterlist
*sg
;
2204 unsigned int offset
;
2208 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2210 * 1) read the specified logical block(s);
2211 * 2) transfer logical blocks from the data-out buffer;
2212 * 3) XOR the logical blocks transferred from the data-out buffer with
2213 * the logical blocks read, storing the resulting XOR data in a buffer;
2214 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2215 * blocks transferred from the data-out buffer; and
2216 * 5) transfer the resulting XOR data to the data-in buffer.
2218 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2220 pr_err("Unable to allocate xor_callback buf\n");
2224 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2225 * into the locally allocated *buf
2227 sg_copy_to_buffer(cmd
->t_data_sg
,
2233 * Now perform the XOR against the BIDI read memory located at
2234 * cmd->t_mem_bidi_list
2238 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2239 addr
= kmap_atomic(sg_page(sg
));
2243 for (i
= 0; i
< sg
->length
; i
++)
2244 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2246 offset
+= sg
->length
;
2247 kunmap_atomic(addr
);
2255 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2257 static int transport_get_sense_data(struct se_cmd
*cmd
)
2259 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2260 struct se_device
*dev
= cmd
->se_dev
;
2261 unsigned long flags
;
2264 WARN_ON(!cmd
->se_lun
);
2269 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2270 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2271 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2275 if (!(cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2278 if (!dev
->transport
->get_sense_buffer
) {
2279 pr_err("dev->transport->get_sense_buffer is NULL\n");
2283 sense_buffer
= dev
->transport
->get_sense_buffer(cmd
);
2284 if (!sense_buffer
) {
2285 pr_err("ITT 0x%08x cmd %p: Unable to locate"
2286 " sense buffer for task with sense\n",
2287 cmd
->se_tfo
->get_task_tag(cmd
), cmd
);
2291 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2293 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
, TRANSPORT_SENSE_BUFFER
);
2295 memcpy(&buffer
[offset
], sense_buffer
, TRANSPORT_SENSE_BUFFER
);
2297 /* Automatically padded */
2298 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
2300 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2301 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
2305 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2309 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2311 return dev
->transport
->get_blocks(dev
) + 1;
2314 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2316 struct se_device
*dev
= cmd
->se_dev
;
2319 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2322 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2324 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2325 pr_err("LBA: %llu Sectors: %u exceeds"
2326 " transport_dev_end_lba(): %llu\n",
2327 cmd
->t_task_lba
, sectors
,
2328 transport_dev_end_lba(dev
));
2335 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2338 * Determine if the received WRITE_SAME is used to for direct
2339 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2340 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2341 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2343 int passthrough
= (dev
->transport
->transport_type
==
2344 TRANSPORT_PLUGIN_PHBA_PDEV
);
2347 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2348 pr_err("WRITE_SAME PBDATA and LBDATA"
2349 " bits not supported for Block Discard"
2354 * Currently for the emulated case we only accept
2355 * tpws with the UNMAP=1 bit set.
2357 if (!(flags
[0] & 0x08)) {
2358 pr_err("WRITE_SAME w/o UNMAP bit not"
2359 " supported for Block Discard Emulation\n");
2367 /* transport_generic_cmd_sequencer():
2369 * Generic Command Sequencer that should work for most DAS transport
2372 * Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
2375 * FIXME: Need to support other SCSI OPCODES where as well.
2377 static int transport_generic_cmd_sequencer(
2381 struct se_device
*dev
= cmd
->se_dev
;
2382 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2383 int ret
= 0, sector_ret
= 0, passthrough
;
2384 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2388 * Check for an existing UNIT ATTENTION condition
2390 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2391 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2392 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2396 * Check status of Asymmetric Logical Unit Assignment port
2398 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2401 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2402 * The ALUA additional sense code qualifier (ASCQ) is determined
2403 * by the ALUA primary or secondary access state..
2406 pr_debug("[%s]: ALUA TG Port not available,"
2407 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2408 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2410 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2411 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2412 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2415 goto out_invalid_cdb_field
;
2418 * Check status for SPC-3 Persistent Reservations
2420 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2421 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2422 cmd
, cdb
, pr_reg_type
) != 0) {
2423 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2424 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2425 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2426 cmd
->scsi_sense_reason
= TCM_RESERVATION_CONFLICT
;
2430 * This means the CDB is allowed for the SCSI Initiator port
2431 * when said port is *NOT* holding the legacy SPC-2 or
2432 * SPC-3 Persistent Reservation.
2437 * If we operate in passthrough mode we skip most CDB emulation and
2438 * instead hand the commands down to the physical SCSI device.
2441 (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
);
2445 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2447 goto out_unsupported_cdb
;
2448 size
= transport_get_size(sectors
, cdb
, cmd
);
2449 cmd
->t_task_lba
= transport_lba_21(cdb
);
2450 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2453 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2455 goto out_unsupported_cdb
;
2456 size
= transport_get_size(sectors
, cdb
, cmd
);
2457 cmd
->t_task_lba
= transport_lba_32(cdb
);
2458 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2461 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2463 goto out_unsupported_cdb
;
2464 size
= transport_get_size(sectors
, cdb
, cmd
);
2465 cmd
->t_task_lba
= transport_lba_32(cdb
);
2466 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2469 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2471 goto out_unsupported_cdb
;
2472 size
= transport_get_size(sectors
, cdb
, cmd
);
2473 cmd
->t_task_lba
= transport_lba_64(cdb
);
2474 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2477 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2479 goto out_unsupported_cdb
;
2480 size
= transport_get_size(sectors
, cdb
, cmd
);
2481 cmd
->t_task_lba
= transport_lba_21(cdb
);
2482 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2486 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2488 goto out_unsupported_cdb
;
2489 size
= transport_get_size(sectors
, cdb
, cmd
);
2490 cmd
->t_task_lba
= transport_lba_32(cdb
);
2492 cmd
->se_cmd_flags
|= SCF_FUA
;
2493 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2496 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2498 goto out_unsupported_cdb
;
2499 size
= transport_get_size(sectors
, cdb
, cmd
);
2500 cmd
->t_task_lba
= transport_lba_32(cdb
);
2502 cmd
->se_cmd_flags
|= SCF_FUA
;
2503 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2506 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2508 goto out_unsupported_cdb
;
2509 size
= transport_get_size(sectors
, cdb
, cmd
);
2510 cmd
->t_task_lba
= transport_lba_64(cdb
);
2512 cmd
->se_cmd_flags
|= SCF_FUA
;
2513 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2515 case XDWRITEREAD_10
:
2516 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2517 !(cmd
->se_cmd_flags
& SCF_BIDI
))
2518 goto out_invalid_cdb_field
;
2519 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2521 goto out_unsupported_cdb
;
2522 size
= transport_get_size(sectors
, cdb
, cmd
);
2523 cmd
->t_task_lba
= transport_lba_32(cdb
);
2524 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2527 * Do now allow BIDI commands for passthrough mode.
2530 goto out_unsupported_cdb
;
2533 * Setup BIDI XOR callback to be run after I/O completion.
2535 cmd
->transport_complete_callback
= &transport_xor_callback
;
2537 cmd
->se_cmd_flags
|= SCF_FUA
;
2539 case VARIABLE_LENGTH_CMD
:
2540 service_action
= get_unaligned_be16(&cdb
[8]);
2541 switch (service_action
) {
2542 case XDWRITEREAD_32
:
2543 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2545 goto out_unsupported_cdb
;
2546 size
= transport_get_size(sectors
, cdb
, cmd
);
2548 * Use WRITE_32 and READ_32 opcodes for the emulated
2549 * XDWRITE_READ_32 logic.
2551 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2552 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2555 * Do now allow BIDI commands for passthrough mode.
2558 goto out_unsupported_cdb
;
2561 * Setup BIDI XOR callback to be run during after I/O
2564 cmd
->transport_complete_callback
= &transport_xor_callback
;
2566 cmd
->se_cmd_flags
|= SCF_FUA
;
2569 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2571 goto out_unsupported_cdb
;
2574 size
= transport_get_size(1, cdb
, cmd
);
2576 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2578 goto out_invalid_cdb_field
;
2581 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2582 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2584 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2585 goto out_unsupported_cdb
;
2587 cmd
->execute_cmd
= target_emulate_write_same
;
2590 pr_err("VARIABLE_LENGTH_CMD service action"
2591 " 0x%04x not supported\n", service_action
);
2592 goto out_unsupported_cdb
;
2595 case MAINTENANCE_IN
:
2596 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2597 /* MAINTENANCE_IN from SCC-2 */
2599 * Check for emulated MI_REPORT_TARGET_PGS.
2601 if ((cdb
[1] & 0x1f) == MI_REPORT_TARGET_PGS
&&
2602 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2604 target_emulate_report_target_port_groups
;
2606 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2607 (cdb
[8] << 8) | cdb
[9];
2609 /* GPCMD_SEND_KEY from multi media commands */
2610 size
= (cdb
[8] << 8) + cdb
[9];
2612 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2616 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2618 case MODE_SELECT_10
:
2619 size
= (cdb
[7] << 8) + cdb
[8];
2620 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2624 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2626 cmd
->execute_cmd
= target_emulate_modesense
;
2629 size
= (cdb
[7] << 8) + cdb
[8];
2630 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2632 cmd
->execute_cmd
= target_emulate_modesense
;
2634 case GPCMD_READ_BUFFER_CAPACITY
:
2635 case GPCMD_SEND_OPC
:
2638 size
= (cdb
[7] << 8) + cdb
[8];
2639 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2641 case READ_BLOCK_LIMITS
:
2642 size
= READ_BLOCK_LEN
;
2643 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2645 case GPCMD_GET_CONFIGURATION
:
2646 case GPCMD_READ_FORMAT_CAPACITIES
:
2647 case GPCMD_READ_DISC_INFO
:
2648 case GPCMD_READ_TRACK_RZONE_INFO
:
2649 size
= (cdb
[7] << 8) + cdb
[8];
2650 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2652 case PERSISTENT_RESERVE_IN
:
2653 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2654 cmd
->execute_cmd
= target_scsi3_emulate_pr_in
;
2655 size
= (cdb
[7] << 8) + cdb
[8];
2656 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2658 case PERSISTENT_RESERVE_OUT
:
2659 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2660 cmd
->execute_cmd
= target_scsi3_emulate_pr_out
;
2661 size
= (cdb
[7] << 8) + cdb
[8];
2662 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2664 case GPCMD_MECHANISM_STATUS
:
2665 case GPCMD_READ_DVD_STRUCTURE
:
2666 size
= (cdb
[8] << 8) + cdb
[9];
2667 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2670 size
= READ_POSITION_LEN
;
2671 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2673 case MAINTENANCE_OUT
:
2674 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2675 /* MAINTENANCE_OUT from SCC-2
2677 * Check for emulated MO_SET_TARGET_PGS.
2679 if (cdb
[1] == MO_SET_TARGET_PGS
&&
2680 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2682 target_emulate_set_target_port_groups
;
2685 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2686 (cdb
[8] << 8) | cdb
[9];
2688 /* GPCMD_REPORT_KEY from multi media commands */
2689 size
= (cdb
[8] << 8) + cdb
[9];
2691 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2694 size
= (cdb
[3] << 8) + cdb
[4];
2696 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2697 * See spc4r17 section 5.3
2699 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2700 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
2701 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2703 cmd
->execute_cmd
= target_emulate_inquiry
;
2706 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2707 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2710 size
= READ_CAP_LEN
;
2711 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2713 cmd
->execute_cmd
= target_emulate_readcapacity
;
2715 case READ_MEDIA_SERIAL_NUMBER
:
2716 case SECURITY_PROTOCOL_IN
:
2717 case SECURITY_PROTOCOL_OUT
:
2718 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2719 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2721 case SERVICE_ACTION_IN
:
2722 switch (cmd
->t_task_cdb
[1] & 0x1f) {
2723 case SAI_READ_CAPACITY_16
:
2726 target_emulate_readcapacity_16
;
2732 pr_err("Unsupported SA: 0x%02x\n",
2733 cmd
->t_task_cdb
[1] & 0x1f);
2734 goto out_invalid_cdb_field
;
2737 case ACCESS_CONTROL_IN
:
2738 case ACCESS_CONTROL_OUT
:
2740 case READ_ATTRIBUTE
:
2741 case RECEIVE_COPY_RESULTS
:
2742 case WRITE_ATTRIBUTE
:
2743 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
2744 (cdb
[12] << 8) | cdb
[13];
2745 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2747 case RECEIVE_DIAGNOSTIC
:
2748 case SEND_DIAGNOSTIC
:
2749 size
= (cdb
[3] << 8) | cdb
[4];
2750 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2752 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2755 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2756 size
= (2336 * sectors
);
2757 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2762 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2766 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2768 cmd
->execute_cmd
= target_emulate_request_sense
;
2770 case READ_ELEMENT_STATUS
:
2771 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
2772 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2775 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2776 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2781 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2782 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2784 if (cdb
[0] == RESERVE_10
)
2785 size
= (cdb
[7] << 8) | cdb
[8];
2787 size
= cmd
->data_length
;
2790 * Setup the legacy emulated handler for SPC-2 and
2791 * >= SPC-3 compatible reservation handling (CRH=1)
2792 * Otherwise, we assume the underlying SCSI logic is
2793 * is running in SPC_PASSTHROUGH, and wants reservations
2794 * emulation disabled.
2796 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2797 cmd
->execute_cmd
= target_scsi2_reservation_reserve
;
2798 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2803 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2804 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2806 if (cdb
[0] == RELEASE_10
)
2807 size
= (cdb
[7] << 8) | cdb
[8];
2809 size
= cmd
->data_length
;
2811 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2812 cmd
->execute_cmd
= target_scsi2_reservation_release
;
2813 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2815 case SYNCHRONIZE_CACHE
:
2816 case SYNCHRONIZE_CACHE_16
:
2818 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2820 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
2821 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2822 cmd
->t_task_lba
= transport_lba_32(cdb
);
2824 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2825 cmd
->t_task_lba
= transport_lba_64(cdb
);
2828 goto out_unsupported_cdb
;
2830 size
= transport_get_size(sectors
, cdb
, cmd
);
2831 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2837 * Check to ensure that LBA + Range does not exceed past end of
2838 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2840 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
2841 if (transport_cmd_get_valid_sectors(cmd
) < 0)
2842 goto out_invalid_cdb_field
;
2844 cmd
->execute_cmd
= target_emulate_synchronize_cache
;
2847 size
= get_unaligned_be16(&cdb
[7]);
2848 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2850 cmd
->execute_cmd
= target_emulate_unmap
;
2853 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2855 goto out_unsupported_cdb
;
2858 size
= transport_get_size(1, cdb
, cmd
);
2860 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2861 goto out_invalid_cdb_field
;
2864 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
2865 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2867 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2868 goto out_unsupported_cdb
;
2870 cmd
->execute_cmd
= target_emulate_write_same
;
2873 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2875 goto out_unsupported_cdb
;
2878 size
= transport_get_size(1, cdb
, cmd
);
2880 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2881 goto out_invalid_cdb_field
;
2884 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
2885 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2887 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2888 * of byte 1 bit 3 UNMAP instead of original reserved field
2890 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2891 goto out_unsupported_cdb
;
2893 cmd
->execute_cmd
= target_emulate_write_same
;
2895 case ALLOW_MEDIUM_REMOVAL
:
2901 case TEST_UNIT_READY
:
2903 case WRITE_FILEMARKS
:
2904 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2906 cmd
->execute_cmd
= target_emulate_noop
;
2908 case GPCMD_CLOSE_TRACK
:
2909 case INITIALIZE_ELEMENT_STATUS
:
2910 case GPCMD_LOAD_UNLOAD
:
2911 case GPCMD_SET_SPEED
:
2913 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2916 cmd
->execute_cmd
= target_report_luns
;
2917 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2919 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2920 * See spc4r17 section 5.3
2922 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2923 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
2924 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2926 case GET_EVENT_STATUS_NOTIFICATION
:
2927 size
= (cdb
[7] << 8) | cdb
[8];
2928 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2931 /* Only support ATA passthrough to pSCSI backends.. */
2933 goto out_unsupported_cdb
;
2936 switch (cdb
[2] & 0x3) {
2941 sectors
= (((cdb
[1] & 0x1) ? cdb
[3] : 0) << 8) | cdb
[4];
2944 sectors
= (((cdb
[1] & 0x1) ? cdb
[5] : 0) << 8) | cdb
[6];
2947 pr_err("T_LENGTH=0x3 not supported for ATA_16\n");
2948 goto out_invalid_cdb_field
;
2953 /* BLOCK T_TYPE: 512 or sector */
2954 size
= sectors
* ((cdb
[2] & 0x10) ?
2955 dev
->se_sub_dev
->se_dev_attrib
.block_size
: 512);
2960 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2963 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
2964 " 0x%02x, sending CHECK_CONDITION.\n",
2965 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
2966 goto out_unsupported_cdb
;
2969 if (cmd
->unknown_data_length
)
2970 cmd
->data_length
= size
;
2972 if (size
!= cmd
->data_length
) {
2973 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
2974 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
2975 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
2976 cmd
->data_length
, size
, cdb
[0]);
2978 cmd
->cmd_spdtl
= size
;
2980 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
2981 pr_err("Rejecting underflow/overflow"
2983 goto out_invalid_cdb_field
;
2986 * Reject READ_* or WRITE_* with overflow/underflow for
2987 * type SCF_SCSI_DATA_SG_IO_CDB.
2989 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
2990 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
2991 " CDB on non 512-byte sector setup subsystem"
2992 " plugin: %s\n", dev
->transport
->name
);
2993 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
2994 goto out_invalid_cdb_field
;
2997 if (size
> cmd
->data_length
) {
2998 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
2999 cmd
->residual_count
= (size
- cmd
->data_length
);
3001 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3002 cmd
->residual_count
= (cmd
->data_length
- size
);
3004 cmd
->data_length
= size
;
3007 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
3008 if (sectors
> su_dev
->se_dev_attrib
.fabric_max_sectors
) {
3009 printk_ratelimited(KERN_ERR
"SCSI OP %02xh with too"
3010 " big sectors %u exceeds fabric_max_sectors:"
3011 " %u\n", cdb
[0], sectors
,
3012 su_dev
->se_dev_attrib
.fabric_max_sectors
);
3013 goto out_invalid_cdb_field
;
3015 if (sectors
> su_dev
->se_dev_attrib
.hw_max_sectors
) {
3016 printk_ratelimited(KERN_ERR
"SCSI OP %02xh with too"
3017 " big sectors %u exceeds backend hw_max_sectors:"
3018 " %u\n", cdb
[0], sectors
,
3019 su_dev
->se_dev_attrib
.hw_max_sectors
);
3020 goto out_invalid_cdb_field
;
3024 /* reject any command that we don't have a handler for */
3025 if (!(passthrough
|| cmd
->execute_cmd
||
3026 (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
3027 goto out_unsupported_cdb
;
3029 transport_set_supported_SAM_opcode(cmd
);
3032 out_unsupported_cdb
:
3033 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3034 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3036 out_invalid_cdb_field
:
3037 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3038 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3043 * Called from I/O completion to determine which dormant/delayed
3044 * and ordered cmds need to have their tasks added to the execution queue.
3046 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3048 struct se_device
*dev
= cmd
->se_dev
;
3049 struct se_cmd
*cmd_p
, *cmd_tmp
;
3050 int new_active_tasks
= 0;
3052 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3053 atomic_dec(&dev
->simple_cmds
);
3054 smp_mb__after_atomic_dec();
3055 dev
->dev_cur_ordered_id
++;
3056 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3057 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3058 cmd
->se_ordered_id
);
3059 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3060 dev
->dev_cur_ordered_id
++;
3061 pr_debug("Incremented dev_cur_ordered_id: %u for"
3062 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3063 cmd
->se_ordered_id
);
3064 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3065 atomic_dec(&dev
->dev_ordered_sync
);
3066 smp_mb__after_atomic_dec();
3068 dev
->dev_cur_ordered_id
++;
3069 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3070 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3073 * Process all commands up to the last received
3074 * ORDERED task attribute which requires another blocking
3077 spin_lock(&dev
->delayed_cmd_lock
);
3078 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3079 &dev
->delayed_cmd_list
, se_delayed_node
) {
3081 list_del(&cmd_p
->se_delayed_node
);
3082 spin_unlock(&dev
->delayed_cmd_lock
);
3084 pr_debug("Calling add_tasks() for"
3085 " cmd_p: 0x%02x Task Attr: 0x%02x"
3086 " Dormant -> Active, se_ordered_id: %u\n",
3087 cmd_p
->t_task_cdb
[0],
3088 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3090 target_add_to_execute_list(cmd_p
);
3093 spin_lock(&dev
->delayed_cmd_lock
);
3094 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3097 spin_unlock(&dev
->delayed_cmd_lock
);
3099 * If new tasks have become active, wake up the transport thread
3100 * to do the processing of the Active tasks.
3102 if (new_active_tasks
!= 0)
3103 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3106 static void transport_complete_qf(struct se_cmd
*cmd
)
3110 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3111 transport_complete_task_attr(cmd
);
3113 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3114 ret
= cmd
->se_tfo
->queue_status(cmd
);
3119 switch (cmd
->data_direction
) {
3120 case DMA_FROM_DEVICE
:
3121 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3124 if (cmd
->t_bidi_data_sg
) {
3125 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3129 /* Fall through for DMA_TO_DEVICE */
3131 ret
= cmd
->se_tfo
->queue_status(cmd
);
3139 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3142 transport_lun_remove_cmd(cmd
);
3143 transport_cmd_check_stop_to_fabric(cmd
);
3146 static void transport_handle_queue_full(
3148 struct se_device
*dev
)
3150 spin_lock_irq(&dev
->qf_cmd_lock
);
3151 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3152 atomic_inc(&dev
->dev_qf_count
);
3153 smp_mb__after_atomic_inc();
3154 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3156 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3159 static void target_complete_ok_work(struct work_struct
*work
)
3161 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3162 int reason
= 0, ret
;
3165 * Check if we need to move delayed/dormant tasks from cmds on the
3166 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3169 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3170 transport_complete_task_attr(cmd
);
3172 * Check to schedule QUEUE_FULL work, or execute an existing
3173 * cmd->transport_qf_callback()
3175 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3176 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3179 * Check if we need to retrieve a sense buffer from
3180 * the struct se_cmd in question.
3182 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3183 if (transport_get_sense_data(cmd
) < 0)
3184 reason
= TCM_NON_EXISTENT_LUN
;
3186 if (cmd
->scsi_status
) {
3187 ret
= transport_send_check_condition_and_sense(
3189 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3192 transport_lun_remove_cmd(cmd
);
3193 transport_cmd_check_stop_to_fabric(cmd
);
3198 * Check for a callback, used by amongst other things
3199 * XDWRITE_READ_10 emulation.
3201 if (cmd
->transport_complete_callback
)
3202 cmd
->transport_complete_callback(cmd
);
3204 switch (cmd
->data_direction
) {
3205 case DMA_FROM_DEVICE
:
3206 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3207 if (cmd
->se_lun
->lun_sep
) {
3208 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3211 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3213 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3214 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3218 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3219 if (cmd
->se_lun
->lun_sep
) {
3220 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3223 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3225 * Check if we need to send READ payload for BIDI-COMMAND
3227 if (cmd
->t_bidi_data_sg
) {
3228 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3229 if (cmd
->se_lun
->lun_sep
) {
3230 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3233 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3234 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3235 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3239 /* Fall through for DMA_TO_DEVICE */
3241 ret
= cmd
->se_tfo
->queue_status(cmd
);
3242 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3249 transport_lun_remove_cmd(cmd
);
3250 transport_cmd_check_stop_to_fabric(cmd
);
3254 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3255 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3256 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3257 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3260 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3262 struct scatterlist
*sg
;
3265 for_each_sg(sgl
, sg
, nents
, count
)
3266 __free_page(sg_page(sg
));
3271 static inline void transport_free_pages(struct se_cmd
*cmd
)
3273 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3276 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3277 cmd
->t_data_sg
= NULL
;
3278 cmd
->t_data_nents
= 0;
3280 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3281 cmd
->t_bidi_data_sg
= NULL
;
3282 cmd
->t_bidi_data_nents
= 0;
3286 * transport_release_cmd - free a command
3287 * @cmd: command to free
3289 * This routine unconditionally frees a command, and reference counting
3290 * or list removal must be done in the caller.
3292 static void transport_release_cmd(struct se_cmd
*cmd
)
3294 BUG_ON(!cmd
->se_tfo
);
3296 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
3297 core_tmr_release_req(cmd
->se_tmr_req
);
3298 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
3299 kfree(cmd
->t_task_cdb
);
3301 * If this cmd has been setup with target_get_sess_cmd(), drop
3302 * the kref and call ->release_cmd() in kref callback.
3304 if (cmd
->check_release
!= 0) {
3305 target_put_sess_cmd(cmd
->se_sess
, cmd
);
3308 cmd
->se_tfo
->release_cmd(cmd
);
3312 * transport_put_cmd - release a reference to a command
3313 * @cmd: command to release
3315 * This routine releases our reference to the command and frees it if possible.
3317 static void transport_put_cmd(struct se_cmd
*cmd
)
3319 unsigned long flags
;
3321 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3322 if (atomic_read(&cmd
->t_fe_count
)) {
3323 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3327 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
3328 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
3329 target_remove_from_state_list(cmd
);
3331 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3333 transport_free_pages(cmd
);
3334 transport_release_cmd(cmd
);
3337 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3341 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3342 * allocating in the core.
3343 * @cmd: Associated se_cmd descriptor
3344 * @mem: SGL style memory for TCM WRITE / READ
3345 * @sg_mem_num: Number of SGL elements
3346 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3347 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3349 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3352 int transport_generic_map_mem_to_cmd(
3354 struct scatterlist
*sgl
,
3356 struct scatterlist
*sgl_bidi
,
3359 if (!sgl
|| !sgl_count
)
3362 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3363 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3365 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3366 * scatterlists already have been set to follow what the fabric
3367 * passes for the original expected data transfer length.
3369 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3370 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3371 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3372 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3373 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3377 cmd
->t_data_sg
= sgl
;
3378 cmd
->t_data_nents
= sgl_count
;
3380 if (sgl_bidi
&& sgl_bidi_count
) {
3381 cmd
->t_bidi_data_sg
= sgl_bidi
;
3382 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3384 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3389 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3391 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
3393 struct scatterlist
*sg
= cmd
->t_data_sg
;
3394 struct page
**pages
;
3399 * We need to take into account a possible offset here for fabrics like
3400 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3401 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3403 if (!cmd
->t_data_nents
)
3405 else if (cmd
->t_data_nents
== 1)
3406 return kmap(sg_page(sg
)) + sg
->offset
;
3408 /* >1 page. use vmap */
3409 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
3413 /* convert sg[] to pages[] */
3414 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
3415 pages
[i
] = sg_page(sg
);
3418 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
3420 if (!cmd
->t_data_vmap
)
3423 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
3425 EXPORT_SYMBOL(transport_kmap_data_sg
);
3427 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
3429 if (!cmd
->t_data_nents
) {
3431 } else if (cmd
->t_data_nents
== 1) {
3432 kunmap(sg_page(cmd
->t_data_sg
));
3436 vunmap(cmd
->t_data_vmap
);
3437 cmd
->t_data_vmap
= NULL
;
3439 EXPORT_SYMBOL(transport_kunmap_data_sg
);
3442 transport_generic_get_mem(struct se_cmd
*cmd
)
3444 u32 length
= cmd
->data_length
;
3450 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3451 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3452 if (!cmd
->t_data_sg
)
3455 cmd
->t_data_nents
= nents
;
3456 sg_init_table(cmd
->t_data_sg
, nents
);
3458 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
? 0 : __GFP_ZERO
;
3461 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3462 page
= alloc_page(GFP_KERNEL
| zero_flag
);
3466 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3474 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3477 kfree(cmd
->t_data_sg
);
3478 cmd
->t_data_sg
= NULL
;
3483 * Allocate any required resources to execute the command. For writes we
3484 * might not have the payload yet, so notify the fabric via a call to
3485 * ->write_pending instead. Otherwise place it on the execution queue.
3487 int transport_generic_new_cmd(struct se_cmd
*cmd
)
3489 struct se_device
*dev
= cmd
->se_dev
;
3493 * Determine is the TCM fabric module has already allocated physical
3494 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3497 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
3499 ret
= transport_generic_get_mem(cmd
);
3504 /* Workaround for handling zero-length control CDBs */
3505 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3506 !cmd
->data_length
) {
3507 spin_lock_irq(&cmd
->t_state_lock
);
3508 cmd
->t_state
= TRANSPORT_COMPLETE
;
3509 cmd
->transport_state
|= CMD_T_ACTIVE
;
3510 spin_unlock_irq(&cmd
->t_state_lock
);
3512 if (cmd
->t_task_cdb
[0] == REQUEST_SENSE
) {
3513 u8 ua_asc
= 0, ua_ascq
= 0;
3515 core_scsi3_ua_clear_for_request_sense(cmd
,
3519 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
3520 queue_work(target_completion_wq
, &cmd
->work
);
3524 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
3525 struct se_dev_attrib
*attr
= &dev
->se_sub_dev
->se_dev_attrib
;
3527 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3530 BUG_ON(cmd
->data_length
% attr
->block_size
);
3531 BUG_ON(DIV_ROUND_UP(cmd
->data_length
, attr
->block_size
) >
3532 attr
->hw_max_sectors
);
3535 atomic_inc(&cmd
->t_fe_count
);
3538 * For WRITEs, let the fabric know its buffer is ready.
3540 * The command will be added to the execution queue after its write
3543 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3544 target_add_to_state_list(cmd
);
3545 return transport_generic_write_pending(cmd
);
3548 * Everything else but a WRITE, add the command to the execution queue.
3550 transport_execute_tasks(cmd
);
3554 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3555 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3558 EXPORT_SYMBOL(transport_generic_new_cmd
);
3560 /* transport_generic_process_write():
3564 void transport_generic_process_write(struct se_cmd
*cmd
)
3566 transport_execute_tasks(cmd
);
3568 EXPORT_SYMBOL(transport_generic_process_write
);
3570 static void transport_write_pending_qf(struct se_cmd
*cmd
)
3574 ret
= cmd
->se_tfo
->write_pending(cmd
);
3575 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
3576 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3578 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3582 static int transport_generic_write_pending(struct se_cmd
*cmd
)
3584 unsigned long flags
;
3587 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3588 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
3589 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3592 * Clear the se_cmd for WRITE_PENDING status in order to set
3593 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3594 * from HW target mode interrupt code. This is safe to be called
3595 * with transport_off=1 before the cmd->se_tfo->write_pending
3596 * because the se_cmd->se_lun pointer is not being cleared.
3598 transport_cmd_check_stop(cmd
, 1, 0);
3601 * Call the fabric write_pending function here to let the
3602 * frontend know that WRITE buffers are ready.
3604 ret
= cmd
->se_tfo
->write_pending(cmd
);
3605 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3613 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
3614 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
3615 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3619 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
3621 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
3622 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
3623 transport_wait_for_tasks(cmd
);
3625 transport_release_cmd(cmd
);
3628 transport_wait_for_tasks(cmd
);
3630 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
3633 transport_lun_remove_cmd(cmd
);
3635 transport_put_cmd(cmd
);
3638 EXPORT_SYMBOL(transport_generic_free_cmd
);
3640 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3641 * @se_sess: session to reference
3642 * @se_cmd: command descriptor to add
3643 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
3645 void target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
3648 unsigned long flags
;
3650 kref_init(&se_cmd
->cmd_kref
);
3652 * Add a second kref if the fabric caller is expecting to handle
3653 * fabric acknowledgement that requires two target_put_sess_cmd()
3654 * invocations before se_cmd descriptor release.
3656 if (ack_kref
== true) {
3657 kref_get(&se_cmd
->cmd_kref
);
3658 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
3661 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3662 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
3663 se_cmd
->check_release
= 1;
3664 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3666 EXPORT_SYMBOL(target_get_sess_cmd
);
3668 static void target_release_cmd_kref(struct kref
*kref
)
3670 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
3671 struct se_session
*se_sess
= se_cmd
->se_sess
;
3672 unsigned long flags
;
3674 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3675 if (list_empty(&se_cmd
->se_cmd_list
)) {
3676 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3677 se_cmd
->se_tfo
->release_cmd(se_cmd
);
3680 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
3681 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3682 complete(&se_cmd
->cmd_wait_comp
);
3685 list_del(&se_cmd
->se_cmd_list
);
3686 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3688 se_cmd
->se_tfo
->release_cmd(se_cmd
);
3691 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3692 * @se_sess: session to reference
3693 * @se_cmd: command descriptor to drop
3695 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
3697 return kref_put(&se_cmd
->cmd_kref
, target_release_cmd_kref
);
3699 EXPORT_SYMBOL(target_put_sess_cmd
);
3701 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3702 * @se_sess: session to split
3704 void target_splice_sess_cmd_list(struct se_session
*se_sess
)
3706 struct se_cmd
*se_cmd
;
3707 unsigned long flags
;
3709 WARN_ON(!list_empty(&se_sess
->sess_wait_list
));
3710 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
3712 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3713 se_sess
->sess_tearing_down
= 1;
3715 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
3717 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
3718 se_cmd
->cmd_wait_set
= 1;
3720 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3722 EXPORT_SYMBOL(target_splice_sess_cmd_list
);
3724 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
3725 * @se_sess: session to wait for active I/O
3726 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3728 void target_wait_for_sess_cmds(
3729 struct se_session
*se_sess
,
3732 struct se_cmd
*se_cmd
, *tmp_cmd
;
3735 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
3736 &se_sess
->sess_wait_list
, se_cmd_list
) {
3737 list_del(&se_cmd
->se_cmd_list
);
3739 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3740 " %d\n", se_cmd
, se_cmd
->t_state
,
3741 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3743 if (wait_for_tasks
) {
3744 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3745 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
3746 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3748 rc
= transport_wait_for_tasks(se_cmd
);
3750 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3751 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
3752 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3756 wait_for_completion(&se_cmd
->cmd_wait_comp
);
3757 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3758 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
3759 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3762 se_cmd
->se_tfo
->release_cmd(se_cmd
);
3765 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
3767 /* transport_lun_wait_for_tasks():
3769 * Called from ConfigFS context to stop the passed struct se_cmd to allow
3770 * an struct se_lun to be successfully shutdown.
3772 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
3774 unsigned long flags
;
3778 * If the frontend has already requested this struct se_cmd to
3779 * be stopped, we can safely ignore this struct se_cmd.
3781 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3782 if (cmd
->transport_state
& CMD_T_STOP
) {
3783 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
3785 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3786 cmd
->se_tfo
->get_task_tag(cmd
));
3787 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3788 transport_cmd_check_stop(cmd
, 1, 0);
3791 cmd
->transport_state
|= CMD_T_LUN_FE_STOP
;
3792 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3794 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
3796 // XXX: audit task_flags checks.
3797 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3798 if ((cmd
->transport_state
& CMD_T_BUSY
) &&
3799 (cmd
->transport_state
& CMD_T_SENT
)) {
3800 if (!target_stop_cmd(cmd
, &flags
))
3802 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3804 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3806 target_remove_from_execute_list(cmd
);
3809 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3812 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
3813 cmd
->se_tfo
->get_task_tag(cmd
));
3814 wait_for_completion(&cmd
->transport_lun_stop_comp
);
3815 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
3816 cmd
->se_tfo
->get_task_tag(cmd
));
3818 transport_remove_cmd_from_queue(cmd
);
3823 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
3825 struct se_cmd
*cmd
= NULL
;
3826 unsigned long lun_flags
, cmd_flags
;
3828 * Do exception processing and return CHECK_CONDITION status to the
3831 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3832 while (!list_empty(&lun
->lun_cmd_list
)) {
3833 cmd
= list_first_entry(&lun
->lun_cmd_list
,
3834 struct se_cmd
, se_lun_node
);
3835 list_del_init(&cmd
->se_lun_node
);
3838 * This will notify iscsi_target_transport.c:
3839 * transport_cmd_check_stop() that a LUN shutdown is in
3840 * progress for the iscsi_cmd_t.
3842 spin_lock(&cmd
->t_state_lock
);
3843 pr_debug("SE_LUN[%d] - Setting cmd->transport"
3844 "_lun_stop for ITT: 0x%08x\n",
3845 cmd
->se_lun
->unpacked_lun
,
3846 cmd
->se_tfo
->get_task_tag(cmd
));
3847 cmd
->transport_state
|= CMD_T_LUN_STOP
;
3848 spin_unlock(&cmd
->t_state_lock
);
3850 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
3853 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
3854 cmd
->se_tfo
->get_task_tag(cmd
),
3855 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
3859 * If the Storage engine still owns the iscsi_cmd_t, determine
3860 * and/or stop its context.
3862 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
3863 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
3864 cmd
->se_tfo
->get_task_tag(cmd
));
3866 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
3867 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3871 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
3872 "_wait_for_tasks(): SUCCESS\n",
3873 cmd
->se_lun
->unpacked_lun
,
3874 cmd
->se_tfo
->get_task_tag(cmd
));
3876 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
3877 if (!(cmd
->transport_state
& CMD_T_DEV_ACTIVE
)) {
3878 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
3881 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
3882 target_remove_from_state_list(cmd
);
3883 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
3886 * The Storage engine stopped this struct se_cmd before it was
3887 * send to the fabric frontend for delivery back to the
3888 * Initiator Node. Return this SCSI CDB back with an
3889 * CHECK_CONDITION status.
3892 transport_send_check_condition_and_sense(cmd
,
3893 TCM_NON_EXISTENT_LUN
, 0);
3895 * If the fabric frontend is waiting for this iscsi_cmd_t to
3896 * be released, notify the waiting thread now that LU has
3897 * finished accessing it.
3899 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
3900 if (cmd
->transport_state
& CMD_T_LUN_FE_STOP
) {
3901 pr_debug("SE_LUN[%d] - Detected FE stop for"
3902 " struct se_cmd: %p ITT: 0x%08x\n",
3904 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
3906 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3908 transport_cmd_check_stop(cmd
, 1, 0);
3909 complete(&cmd
->transport_lun_fe_stop_comp
);
3910 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3913 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
3914 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
3916 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
3917 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3919 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
3922 static int transport_clear_lun_thread(void *p
)
3924 struct se_lun
*lun
= p
;
3926 __transport_clear_lun_from_sessions(lun
);
3927 complete(&lun
->lun_shutdown_comp
);
3932 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
3934 struct task_struct
*kt
;
3936 kt
= kthread_run(transport_clear_lun_thread
, lun
,
3937 "tcm_cl_%u", lun
->unpacked_lun
);
3939 pr_err("Unable to start clear_lun thread\n");
3942 wait_for_completion(&lun
->lun_shutdown_comp
);
3948 * transport_wait_for_tasks - wait for completion to occur
3949 * @cmd: command to wait
3951 * Called from frontend fabric context to wait for storage engine
3952 * to pause and/or release frontend generated struct se_cmd.
3954 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
3956 unsigned long flags
;
3958 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3959 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
3960 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
3961 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3965 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3966 * has been set in transport_set_supported_SAM_opcode().
3968 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
3969 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
3970 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3974 * If we are already stopped due to an external event (ie: LUN shutdown)
3975 * sleep until the connection can have the passed struct se_cmd back.
3976 * The cmd->transport_lun_stopped_sem will be upped by
3977 * transport_clear_lun_from_sessions() once the ConfigFS context caller
3978 * has completed its operation on the struct se_cmd.
3980 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
3981 pr_debug("wait_for_tasks: Stopping"
3982 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
3983 "_stop_comp); for ITT: 0x%08x\n",
3984 cmd
->se_tfo
->get_task_tag(cmd
));
3986 * There is a special case for WRITES where a FE exception +
3987 * LUN shutdown means ConfigFS context is still sleeping on
3988 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3989 * We go ahead and up transport_lun_stop_comp just to be sure
3992 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3993 complete(&cmd
->transport_lun_stop_comp
);
3994 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
3995 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3997 target_remove_from_state_list(cmd
);
3999 * At this point, the frontend who was the originator of this
4000 * struct se_cmd, now owns the structure and can be released through
4001 * normal means below.
4003 pr_debug("wait_for_tasks: Stopped"
4004 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4005 "stop_comp); for ITT: 0x%08x\n",
4006 cmd
->se_tfo
->get_task_tag(cmd
));
4008 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
4011 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
4012 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4016 cmd
->transport_state
|= CMD_T_STOP
;
4018 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4019 " i_state: %d, t_state: %d, CMD_T_STOP\n",
4020 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4021 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4023 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4025 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4027 wait_for_completion(&cmd
->t_transport_stop_comp
);
4029 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4030 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
4032 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4033 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4034 cmd
->se_tfo
->get_task_tag(cmd
));
4036 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4040 EXPORT_SYMBOL(transport_wait_for_tasks
);
4042 static int transport_get_sense_codes(
4047 *asc
= cmd
->scsi_asc
;
4048 *ascq
= cmd
->scsi_ascq
;
4053 static int transport_set_sense_codes(
4058 cmd
->scsi_asc
= asc
;
4059 cmd
->scsi_ascq
= ascq
;
4064 int transport_send_check_condition_and_sense(
4069 unsigned char *buffer
= cmd
->sense_buffer
;
4070 unsigned long flags
;
4072 u8 asc
= 0, ascq
= 0;
4074 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4075 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4076 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4079 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4080 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4082 if (!reason
&& from_transport
)
4085 if (!from_transport
)
4086 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4088 * Data Segment and SenseLength of the fabric response PDU.
4090 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4091 * from include/scsi/scsi_cmnd.h
4093 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4094 TRANSPORT_SENSE_BUFFER
);
4096 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4097 * SENSE KEY values from include/scsi/scsi.h
4100 case TCM_NON_EXISTENT_LUN
:
4102 buffer
[offset
] = 0x70;
4103 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4104 /* ILLEGAL REQUEST */
4105 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4106 /* LOGICAL UNIT NOT SUPPORTED */
4107 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4109 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4110 case TCM_SECTOR_COUNT_TOO_MANY
:
4112 buffer
[offset
] = 0x70;
4113 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4114 /* ILLEGAL REQUEST */
4115 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4116 /* INVALID COMMAND OPERATION CODE */
4117 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4119 case TCM_UNKNOWN_MODE_PAGE
:
4121 buffer
[offset
] = 0x70;
4122 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4123 /* ILLEGAL REQUEST */
4124 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4125 /* INVALID FIELD IN CDB */
4126 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4128 case TCM_CHECK_CONDITION_ABORT_CMD
:
4130 buffer
[offset
] = 0x70;
4131 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4132 /* ABORTED COMMAND */
4133 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4134 /* BUS DEVICE RESET FUNCTION OCCURRED */
4135 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4136 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4138 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4140 buffer
[offset
] = 0x70;
4141 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4142 /* ABORTED COMMAND */
4143 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4145 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4146 /* NOT ENOUGH UNSOLICITED DATA */
4147 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4149 case TCM_INVALID_CDB_FIELD
:
4151 buffer
[offset
] = 0x70;
4152 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4153 /* ILLEGAL REQUEST */
4154 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4155 /* INVALID FIELD IN CDB */
4156 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4158 case TCM_INVALID_PARAMETER_LIST
:
4160 buffer
[offset
] = 0x70;
4161 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4162 /* ILLEGAL REQUEST */
4163 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4164 /* INVALID FIELD IN PARAMETER LIST */
4165 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4167 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4169 buffer
[offset
] = 0x70;
4170 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4171 /* ABORTED COMMAND */
4172 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4174 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4175 /* UNEXPECTED_UNSOLICITED_DATA */
4176 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4178 case TCM_SERVICE_CRC_ERROR
:
4180 buffer
[offset
] = 0x70;
4181 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4182 /* ABORTED COMMAND */
4183 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4184 /* PROTOCOL SERVICE CRC ERROR */
4185 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4187 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4189 case TCM_SNACK_REJECTED
:
4191 buffer
[offset
] = 0x70;
4192 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4193 /* ABORTED COMMAND */
4194 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4196 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4197 /* FAILED RETRANSMISSION REQUEST */
4198 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4200 case TCM_WRITE_PROTECTED
:
4202 buffer
[offset
] = 0x70;
4203 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4205 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4206 /* WRITE PROTECTED */
4207 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4209 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4211 buffer
[offset
] = 0x70;
4212 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4213 /* UNIT ATTENTION */
4214 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4215 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4216 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4217 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4219 case TCM_CHECK_CONDITION_NOT_READY
:
4221 buffer
[offset
] = 0x70;
4222 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4224 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4225 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4226 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4227 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4229 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4232 buffer
[offset
] = 0x70;
4233 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4234 /* ILLEGAL REQUEST */
4235 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4236 /* LOGICAL UNIT COMMUNICATION FAILURE */
4237 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4241 * This code uses linux/include/scsi/scsi.h SAM status codes!
4243 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4245 * Automatically padded, this value is encoded in the fabric's
4246 * data_length response PDU containing the SCSI defined sense data.
4248 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4251 return cmd
->se_tfo
->queue_status(cmd
);
4253 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4255 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4259 if (cmd
->transport_state
& CMD_T_ABORTED
) {
4261 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4264 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4265 " status for CDB: 0x%02x ITT: 0x%08x\n",
4267 cmd
->se_tfo
->get_task_tag(cmd
));
4269 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4270 cmd
->se_tfo
->queue_status(cmd
);
4275 EXPORT_SYMBOL(transport_check_aborted_status
);
4277 void transport_send_task_abort(struct se_cmd
*cmd
)
4279 unsigned long flags
;
4281 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4282 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4283 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4286 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4289 * If there are still expected incoming fabric WRITEs, we wait
4290 * until until they have completed before sending a TASK_ABORTED
4291 * response. This response with TASK_ABORTED status will be
4292 * queued back to fabric module by transport_check_aborted_status().
4294 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4295 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4296 cmd
->transport_state
|= CMD_T_ABORTED
;
4297 smp_mb__after_atomic_inc();
4300 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4302 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4303 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4304 cmd
->se_tfo
->get_task_tag(cmd
));
4306 cmd
->se_tfo
->queue_status(cmd
);
4309 static int transport_generic_do_tmr(struct se_cmd
*cmd
)
4311 struct se_device
*dev
= cmd
->se_dev
;
4312 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4315 switch (tmr
->function
) {
4316 case TMR_ABORT_TASK
:
4317 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
4319 case TMR_ABORT_TASK_SET
:
4321 case TMR_CLEAR_TASK_SET
:
4322 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4325 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4326 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4327 TMR_FUNCTION_REJECTED
;
4329 case TMR_TARGET_WARM_RESET
:
4330 tmr
->response
= TMR_FUNCTION_REJECTED
;
4332 case TMR_TARGET_COLD_RESET
:
4333 tmr
->response
= TMR_FUNCTION_REJECTED
;
4336 pr_err("Uknown TMR function: 0x%02x.\n",
4338 tmr
->response
= TMR_FUNCTION_REJECTED
;
4342 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4343 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4345 transport_cmd_check_stop_to_fabric(cmd
);
4349 /* transport_processing_thread():
4353 static int transport_processing_thread(void *param
)
4357 struct se_device
*dev
= param
;
4359 while (!kthread_should_stop()) {
4360 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4361 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4362 kthread_should_stop());
4367 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4371 switch (cmd
->t_state
) {
4372 case TRANSPORT_NEW_CMD
:
4375 case TRANSPORT_NEW_CMD_MAP
:
4376 if (!cmd
->se_tfo
->new_cmd_map
) {
4377 pr_err("cmd->se_tfo->new_cmd_map is"
4378 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4381 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4383 transport_generic_request_failure(cmd
);
4386 ret
= transport_generic_new_cmd(cmd
);
4388 transport_generic_request_failure(cmd
);
4392 case TRANSPORT_PROCESS_WRITE
:
4393 transport_generic_process_write(cmd
);
4395 case TRANSPORT_PROCESS_TMR
:
4396 transport_generic_do_tmr(cmd
);
4398 case TRANSPORT_COMPLETE_QF_WP
:
4399 transport_write_pending_qf(cmd
);
4401 case TRANSPORT_COMPLETE_QF_OK
:
4402 transport_complete_qf(cmd
);
4405 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4406 "i_state: %d on SE LUN: %u\n",
4408 cmd
->se_tfo
->get_task_tag(cmd
),
4409 cmd
->se_tfo
->get_cmd_state(cmd
),
4410 cmd
->se_lun
->unpacked_lun
);
4418 WARN_ON(!list_empty(&dev
->state_list
));
4419 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4420 dev
->process_thread
= NULL
;