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 int target_put_session(struct se_session
*se_sess
)
335 return 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 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
461 cmd
->state_active
= false;
463 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
466 /* transport_cmd_check_stop():
468 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
469 * 'transport_off = 2' determines if task_dev_state should be removed.
471 * A non-zero u8 t_state sets cmd->t_state.
472 * Returns 1 when command is stopped, else 0.
474 static int transport_cmd_check_stop(
481 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
483 * Determine if IOCTL context caller in requesting the stopping of this
484 * command for LUN shutdown purposes.
486 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
487 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
488 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
490 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
491 if (transport_off
== 2)
492 target_remove_from_state_list(cmd
);
493 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
495 complete(&cmd
->transport_lun_stop_comp
);
499 * Determine if frontend context caller is requesting the stopping of
500 * this command for frontend exceptions.
502 if (cmd
->transport_state
& CMD_T_STOP
) {
503 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
505 cmd
->se_tfo
->get_task_tag(cmd
));
507 if (transport_off
== 2)
508 target_remove_from_state_list(cmd
);
511 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
514 if (transport_off
== 2)
516 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
518 complete(&cmd
->t_transport_stop_comp
);
522 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
523 if (transport_off
== 2) {
524 target_remove_from_state_list(cmd
);
526 * Clear struct se_cmd->se_lun before the transport_off == 2
527 * handoff to fabric module.
531 * Some fabric modules like tcm_loop can release
532 * their internally allocated I/O reference now and
535 * Fabric modules are expected to return '1' here if the
536 * se_cmd being passed is released at this point,
537 * or zero if not being released.
539 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
540 spin_unlock_irqrestore(
541 &cmd
->t_state_lock
, flags
);
543 return cmd
->se_tfo
->check_stop_free(cmd
);
546 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
550 cmd
->t_state
= t_state
;
551 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
556 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
558 return transport_cmd_check_stop(cmd
, 2, 0);
561 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
563 struct se_lun
*lun
= cmd
->se_lun
;
569 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
570 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
571 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
572 target_remove_from_state_list(cmd
);
574 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
576 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
577 if (!list_empty(&cmd
->se_lun_node
))
578 list_del_init(&cmd
->se_lun_node
);
579 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
582 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
584 if (!(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
585 transport_lun_remove_cmd(cmd
);
587 if (transport_cmd_check_stop_to_fabric(cmd
))
590 transport_remove_cmd_from_queue(cmd
);
591 transport_put_cmd(cmd
);
595 static void transport_add_cmd_to_queue(struct se_cmd
*cmd
, int t_state
,
598 struct se_device
*dev
= cmd
->se_dev
;
599 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
603 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
604 cmd
->t_state
= t_state
;
605 cmd
->transport_state
|= CMD_T_ACTIVE
;
606 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
609 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
611 /* If the cmd is already on the list, remove it before we add it */
612 if (!list_empty(&cmd
->se_queue_node
))
613 list_del(&cmd
->se_queue_node
);
615 atomic_inc(&qobj
->queue_cnt
);
618 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
620 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
621 cmd
->transport_state
|= CMD_T_QUEUED
;
622 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
624 wake_up_interruptible(&qobj
->thread_wq
);
627 static struct se_cmd
*
628 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
633 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
634 if (list_empty(&qobj
->qobj_list
)) {
635 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
638 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
640 cmd
->transport_state
&= ~CMD_T_QUEUED
;
641 list_del_init(&cmd
->se_queue_node
);
642 atomic_dec(&qobj
->queue_cnt
);
643 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
648 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
)
650 struct se_queue_obj
*qobj
= &cmd
->se_dev
->dev_queue_obj
;
653 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
654 if (!(cmd
->transport_state
& CMD_T_QUEUED
)) {
655 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
658 cmd
->transport_state
&= ~CMD_T_QUEUED
;
659 atomic_dec(&qobj
->queue_cnt
);
660 list_del_init(&cmd
->se_queue_node
);
661 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
664 static void target_complete_failure_work(struct work_struct
*work
)
666 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
668 transport_generic_request_failure(cmd
);
671 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
673 struct se_device
*dev
= cmd
->se_dev
;
674 int success
= scsi_status
== GOOD
;
677 cmd
->scsi_status
= scsi_status
;
680 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
681 cmd
->transport_state
&= ~CMD_T_BUSY
;
683 if (dev
&& dev
->transport
->transport_complete
) {
684 if (dev
->transport
->transport_complete(cmd
,
685 cmd
->t_data_sg
) != 0) {
686 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
692 * See if we are waiting to complete for an exception condition.
694 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
695 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
696 complete(&cmd
->task_stop_comp
);
701 cmd
->transport_state
|= CMD_T_FAILED
;
703 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
704 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
709 * Check for case where an explict ABORT_TASK has been received
710 * and transport_wait_for_tasks() will be waiting for completion..
712 if (cmd
->transport_state
& CMD_T_ABORTED
&&
713 cmd
->transport_state
& CMD_T_STOP
) {
714 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
715 complete(&cmd
->t_transport_stop_comp
);
717 } else if (cmd
->transport_state
& CMD_T_FAILED
) {
718 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
719 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
721 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
724 cmd
->t_state
= TRANSPORT_COMPLETE
;
725 cmd
->transport_state
|= (CMD_T_COMPLETE
| CMD_T_ACTIVE
);
726 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
728 queue_work(target_completion_wq
, &cmd
->work
);
730 EXPORT_SYMBOL(target_complete_cmd
);
732 static void target_add_to_state_list(struct se_cmd
*cmd
)
734 struct se_device
*dev
= cmd
->se_dev
;
737 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
738 if (!cmd
->state_active
) {
739 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
740 cmd
->state_active
= true;
742 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
745 static void __target_add_to_execute_list(struct se_cmd
*cmd
)
747 struct se_device
*dev
= cmd
->se_dev
;
748 bool head_of_queue
= false;
750 if (!list_empty(&cmd
->execute_list
))
753 if (dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
&&
754 cmd
->sam_task_attr
== MSG_HEAD_TAG
)
755 head_of_queue
= true;
758 list_add(&cmd
->execute_list
, &dev
->execute_list
);
760 list_add_tail(&cmd
->execute_list
, &dev
->execute_list
);
762 atomic_inc(&dev
->execute_tasks
);
764 if (cmd
->state_active
)
768 list_add(&cmd
->state_list
, &dev
->state_list
);
770 list_add_tail(&cmd
->state_list
, &dev
->state_list
);
772 cmd
->state_active
= true;
775 static void target_add_to_execute_list(struct se_cmd
*cmd
)
778 struct se_device
*dev
= cmd
->se_dev
;
780 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
781 __target_add_to_execute_list(cmd
);
782 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
785 void __target_remove_from_execute_list(struct se_cmd
*cmd
)
787 list_del_init(&cmd
->execute_list
);
788 atomic_dec(&cmd
->se_dev
->execute_tasks
);
791 static void target_remove_from_execute_list(struct se_cmd
*cmd
)
793 struct se_device
*dev
= cmd
->se_dev
;
796 if (WARN_ON(list_empty(&cmd
->execute_list
)))
799 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
800 __target_remove_from_execute_list(cmd
);
801 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
805 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
808 static void target_qf_do_work(struct work_struct
*work
)
810 struct se_device
*dev
= container_of(work
, struct se_device
,
812 LIST_HEAD(qf_cmd_list
);
813 struct se_cmd
*cmd
, *cmd_tmp
;
815 spin_lock_irq(&dev
->qf_cmd_lock
);
816 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
817 spin_unlock_irq(&dev
->qf_cmd_lock
);
819 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
820 list_del(&cmd
->se_qf_node
);
821 atomic_dec(&dev
->dev_qf_count
);
822 smp_mb__after_atomic_dec();
824 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
825 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
826 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
827 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
830 transport_add_cmd_to_queue(cmd
, cmd
->t_state
, true);
834 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
836 switch (cmd
->data_direction
) {
839 case DMA_FROM_DEVICE
:
843 case DMA_BIDIRECTIONAL
:
852 void transport_dump_dev_state(
853 struct se_device
*dev
,
857 *bl
+= sprintf(b
+ *bl
, "Status: ");
858 switch (dev
->dev_status
) {
859 case TRANSPORT_DEVICE_ACTIVATED
:
860 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
862 case TRANSPORT_DEVICE_DEACTIVATED
:
863 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
865 case TRANSPORT_DEVICE_SHUTDOWN
:
866 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
868 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
869 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
870 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
873 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
877 *bl
+= sprintf(b
+ *bl
, " Execute/Max Queue Depth: %d/%d",
878 atomic_read(&dev
->execute_tasks
), dev
->queue_depth
);
879 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
880 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
881 *bl
+= sprintf(b
+ *bl
, " ");
884 void transport_dump_vpd_proto_id(
886 unsigned char *p_buf
,
889 unsigned char buf
[VPD_TMP_BUF_SIZE
];
892 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
893 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
895 switch (vpd
->protocol_identifier
) {
897 sprintf(buf
+len
, "Fibre Channel\n");
900 sprintf(buf
+len
, "Parallel SCSI\n");
903 sprintf(buf
+len
, "SSA\n");
906 sprintf(buf
+len
, "IEEE 1394\n");
909 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
913 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
916 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
919 sprintf(buf
+len
, "Automation/Drive Interface Transport"
923 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
926 sprintf(buf
+len
, "Unknown 0x%02x\n",
927 vpd
->protocol_identifier
);
932 strncpy(p_buf
, buf
, p_buf_len
);
938 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
941 * Check if the Protocol Identifier Valid (PIV) bit is set..
943 * from spc3r23.pdf section 7.5.1
945 if (page_83
[1] & 0x80) {
946 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
947 vpd
->protocol_identifier_set
= 1;
948 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
951 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
953 int transport_dump_vpd_assoc(
955 unsigned char *p_buf
,
958 unsigned char buf
[VPD_TMP_BUF_SIZE
];
962 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
963 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
965 switch (vpd
->association
) {
967 sprintf(buf
+len
, "addressed logical unit\n");
970 sprintf(buf
+len
, "target port\n");
973 sprintf(buf
+len
, "SCSI target device\n");
976 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
982 strncpy(p_buf
, buf
, p_buf_len
);
989 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
992 * The VPD identification association..
994 * from spc3r23.pdf Section 7.6.3.1 Table 297
996 vpd
->association
= (page_83
[1] & 0x30);
997 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
999 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1001 int transport_dump_vpd_ident_type(
1002 struct t10_vpd
*vpd
,
1003 unsigned char *p_buf
,
1006 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1010 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1011 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1013 switch (vpd
->device_identifier_type
) {
1015 sprintf(buf
+len
, "Vendor specific\n");
1018 sprintf(buf
+len
, "T10 Vendor ID based\n");
1021 sprintf(buf
+len
, "EUI-64 based\n");
1024 sprintf(buf
+len
, "NAA\n");
1027 sprintf(buf
+len
, "Relative target port identifier\n");
1030 sprintf(buf
+len
, "SCSI name string\n");
1033 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1034 vpd
->device_identifier_type
);
1040 if (p_buf_len
< strlen(buf
)+1)
1042 strncpy(p_buf
, buf
, p_buf_len
);
1044 pr_debug("%s", buf
);
1050 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1053 * The VPD identifier type..
1055 * from spc3r23.pdf Section 7.6.3.1 Table 298
1057 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1058 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1060 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1062 int transport_dump_vpd_ident(
1063 struct t10_vpd
*vpd
,
1064 unsigned char *p_buf
,
1067 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1070 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1072 switch (vpd
->device_identifier_code_set
) {
1073 case 0x01: /* Binary */
1074 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1075 &vpd
->device_identifier
[0]);
1077 case 0x02: /* ASCII */
1078 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1079 &vpd
->device_identifier
[0]);
1081 case 0x03: /* UTF-8 */
1082 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1083 &vpd
->device_identifier
[0]);
1086 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1087 " 0x%02x", vpd
->device_identifier_code_set
);
1093 strncpy(p_buf
, buf
, p_buf_len
);
1095 pr_debug("%s", buf
);
1101 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1103 static const char hex_str
[] = "0123456789abcdef";
1104 int j
= 0, i
= 4; /* offset to start of the identifer */
1107 * The VPD Code Set (encoding)
1109 * from spc3r23.pdf Section 7.6.3.1 Table 296
1111 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1112 switch (vpd
->device_identifier_code_set
) {
1113 case 0x01: /* Binary */
1114 vpd
->device_identifier
[j
++] =
1115 hex_str
[vpd
->device_identifier_type
];
1116 while (i
< (4 + page_83
[3])) {
1117 vpd
->device_identifier
[j
++] =
1118 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1119 vpd
->device_identifier
[j
++] =
1120 hex_str
[page_83
[i
] & 0x0f];
1124 case 0x02: /* ASCII */
1125 case 0x03: /* UTF-8 */
1126 while (i
< (4 + page_83
[3]))
1127 vpd
->device_identifier
[j
++] = page_83
[i
++];
1133 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1135 EXPORT_SYMBOL(transport_set_vpd_ident
);
1137 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1140 * If this device is from Target_Core_Mod/pSCSI, disable the
1141 * SAM Task Attribute emulation.
1143 * This is currently not available in upsream Linux/SCSI Target
1144 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1146 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1147 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1151 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1152 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1153 " device\n", dev
->transport
->name
,
1154 dev
->transport
->get_device_rev(dev
));
1157 static void scsi_dump_inquiry(struct se_device
*dev
)
1159 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1163 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1165 for (i
= 0; i
< 8; i
++)
1166 if (wwn
->vendor
[i
] >= 0x20)
1167 buf
[i
] = wwn
->vendor
[i
];
1171 pr_debug(" Vendor: %s\n", buf
);
1173 for (i
= 0; i
< 16; i
++)
1174 if (wwn
->model
[i
] >= 0x20)
1175 buf
[i
] = wwn
->model
[i
];
1179 pr_debug(" Model: %s\n", buf
);
1181 for (i
= 0; i
< 4; i
++)
1182 if (wwn
->revision
[i
] >= 0x20)
1183 buf
[i
] = wwn
->revision
[i
];
1187 pr_debug(" Revision: %s\n", buf
);
1189 device_type
= dev
->transport
->get_device_type(dev
);
1190 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1191 pr_debug(" ANSI SCSI revision: %02x\n",
1192 dev
->transport
->get_device_rev(dev
));
1195 struct se_device
*transport_add_device_to_core_hba(
1197 struct se_subsystem_api
*transport
,
1198 struct se_subsystem_dev
*se_dev
,
1200 void *transport_dev
,
1201 struct se_dev_limits
*dev_limits
,
1202 const char *inquiry_prod
,
1203 const char *inquiry_rev
)
1206 struct se_device
*dev
;
1208 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1210 pr_err("Unable to allocate memory for se_dev_t\n");
1214 transport_init_queue_obj(&dev
->dev_queue_obj
);
1215 dev
->dev_flags
= device_flags
;
1216 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1217 dev
->dev_ptr
= transport_dev
;
1219 dev
->se_sub_dev
= se_dev
;
1220 dev
->transport
= transport
;
1221 INIT_LIST_HEAD(&dev
->dev_list
);
1222 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1223 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1224 INIT_LIST_HEAD(&dev
->execute_list
);
1225 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1226 INIT_LIST_HEAD(&dev
->state_list
);
1227 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1228 spin_lock_init(&dev
->execute_task_lock
);
1229 spin_lock_init(&dev
->delayed_cmd_lock
);
1230 spin_lock_init(&dev
->dev_reservation_lock
);
1231 spin_lock_init(&dev
->dev_status_lock
);
1232 spin_lock_init(&dev
->se_port_lock
);
1233 spin_lock_init(&dev
->se_tmr_lock
);
1234 spin_lock_init(&dev
->qf_cmd_lock
);
1235 atomic_set(&dev
->dev_ordered_id
, 0);
1237 se_dev_set_default_attribs(dev
, dev_limits
);
1239 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1240 dev
->creation_time
= get_jiffies_64();
1241 spin_lock_init(&dev
->stats_lock
);
1243 spin_lock(&hba
->device_lock
);
1244 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1246 spin_unlock(&hba
->device_lock
);
1248 * Setup the SAM Task Attribute emulation for struct se_device
1250 core_setup_task_attr_emulation(dev
);
1252 * Force PR and ALUA passthrough emulation with internal object use.
1254 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1256 * Setup the Reservations infrastructure for struct se_device
1258 core_setup_reservations(dev
, force_pt
);
1260 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1262 if (core_setup_alua(dev
, force_pt
) < 0)
1266 * Startup the struct se_device processing thread
1268 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1269 "LIO_%s", dev
->transport
->name
);
1270 if (IS_ERR(dev
->process_thread
)) {
1271 pr_err("Unable to create kthread: LIO_%s\n",
1272 dev
->transport
->name
);
1276 * Setup work_queue for QUEUE_FULL
1278 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1280 * Preload the initial INQUIRY const values if we are doing
1281 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1282 * passthrough because this is being provided by the backend LLD.
1283 * This is required so that transport_get_inquiry() copies these
1284 * originals once back into DEV_T10_WWN(dev) for the virtual device
1287 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1288 if (!inquiry_prod
|| !inquiry_rev
) {
1289 pr_err("All non TCM/pSCSI plugins require"
1290 " INQUIRY consts\n");
1294 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1295 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1296 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1298 scsi_dump_inquiry(dev
);
1302 kthread_stop(dev
->process_thread
);
1304 spin_lock(&hba
->device_lock
);
1305 list_del(&dev
->dev_list
);
1307 spin_unlock(&hba
->device_lock
);
1309 se_release_vpd_for_dev(dev
);
1315 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1317 /* transport_generic_prepare_cdb():
1319 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1320 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1321 * The point of this is since we are mapping iSCSI LUNs to
1322 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1323 * devices and HBAs for a loop.
1325 static inline void transport_generic_prepare_cdb(
1329 case READ_10
: /* SBC - RDProtect */
1330 case READ_12
: /* SBC - RDProtect */
1331 case READ_16
: /* SBC - RDProtect */
1332 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1333 case VERIFY
: /* SBC - VRProtect */
1334 case VERIFY_16
: /* SBC - VRProtect */
1335 case WRITE_VERIFY
: /* SBC - VRProtect */
1336 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1339 cdb
[1] &= 0x1f; /* clear logical unit number */
1344 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1347 * Used by fabric modules containing a local struct se_cmd within their
1348 * fabric dependent per I/O descriptor.
1350 void transport_init_se_cmd(
1352 struct target_core_fabric_ops
*tfo
,
1353 struct se_session
*se_sess
,
1357 unsigned char *sense_buffer
)
1359 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1360 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1361 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1362 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1363 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1364 INIT_LIST_HEAD(&cmd
->execute_list
);
1365 INIT_LIST_HEAD(&cmd
->state_list
);
1366 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1367 init_completion(&cmd
->transport_lun_stop_comp
);
1368 init_completion(&cmd
->t_transport_stop_comp
);
1369 init_completion(&cmd
->cmd_wait_comp
);
1370 init_completion(&cmd
->task_stop_comp
);
1371 spin_lock_init(&cmd
->t_state_lock
);
1372 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1375 cmd
->se_sess
= se_sess
;
1376 cmd
->data_length
= data_length
;
1377 cmd
->data_direction
= data_direction
;
1378 cmd
->sam_task_attr
= task_attr
;
1379 cmd
->sense_buffer
= sense_buffer
;
1381 cmd
->state_active
= false;
1383 EXPORT_SYMBOL(transport_init_se_cmd
);
1385 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1388 * Check if SAM Task Attribute emulation is enabled for this
1389 * struct se_device storage object
1391 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1394 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1395 pr_debug("SAM Task Attribute ACA"
1396 " emulation is not supported\n");
1400 * Used to determine when ORDERED commands should go from
1401 * Dormant to Active status.
1403 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1404 smp_mb__after_atomic_inc();
1405 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1406 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1407 cmd
->se_dev
->transport
->name
);
1411 /* target_setup_cmd_from_cdb():
1413 * Called from fabric RX Thread.
1415 int target_setup_cmd_from_cdb(
1421 transport_generic_prepare_cdb(cdb
);
1423 * Ensure that the received CDB is less than the max (252 + 8) bytes
1424 * for VARIABLE_LENGTH_CMD
1426 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1427 pr_err("Received SCSI CDB with command_size: %d that"
1428 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1429 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1430 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1431 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1435 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1436 * allocate the additional extended CDB buffer now.. Otherwise
1437 * setup the pointer from __t_task_cdb to t_task_cdb.
1439 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1440 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1442 if (!cmd
->t_task_cdb
) {
1443 pr_err("Unable to allocate cmd->t_task_cdb"
1444 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1445 scsi_command_size(cdb
),
1446 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1447 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1448 cmd
->scsi_sense_reason
=
1449 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1453 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1455 * Copy the original CDB into cmd->
1457 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1459 * Setup the received CDB based on SCSI defined opcodes and
1460 * perform unit attention, persistent reservations and ALUA
1461 * checks for virtual device backends. The cmd->t_task_cdb
1462 * pointer is expected to be setup before we reach this point.
1464 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1468 * Check for SAM Task Attribute Emulation
1470 if (transport_check_alloc_task_attr(cmd
) < 0) {
1471 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1472 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1475 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1476 if (cmd
->se_lun
->lun_sep
)
1477 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1478 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1481 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1484 * Used by fabric module frontends to queue tasks directly.
1485 * Many only be used from process context only
1487 int transport_handle_cdb_direct(
1494 pr_err("cmd->se_lun is NULL\n");
1497 if (in_interrupt()) {
1499 pr_err("transport_generic_handle_cdb cannot be called"
1500 " from interrupt context\n");
1504 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1505 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1506 * in existing usage to ensure that outstanding descriptors are handled
1507 * correctly during shutdown via transport_wait_for_tasks()
1509 * Also, we don't take cmd->t_state_lock here as we only expect
1510 * this to be called for initial descriptor submission.
1512 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1513 cmd
->transport_state
|= CMD_T_ACTIVE
;
1516 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1517 * so follow TRANSPORT_NEW_CMD processing thread context usage
1518 * and call transport_generic_request_failure() if necessary..
1520 ret
= transport_generic_new_cmd(cmd
);
1522 transport_generic_request_failure(cmd
);
1526 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1529 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1531 * @se_cmd: command descriptor to submit
1532 * @se_sess: associated se_sess for endpoint
1533 * @cdb: pointer to SCSI CDB
1534 * @sense: pointer to SCSI sense buffer
1535 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1536 * @data_length: fabric expected data transfer length
1537 * @task_addr: SAM task attribute
1538 * @data_dir: DMA data direction
1539 * @flags: flags for command submission from target_sc_flags_tables
1541 * This may only be called from process context, and also currently
1542 * assumes internal allocation of fabric payload buffer by target-core.
1544 void target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1545 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1546 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1548 struct se_portal_group
*se_tpg
;
1551 se_tpg
= se_sess
->se_tpg
;
1553 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1554 BUG_ON(in_interrupt());
1556 * Initialize se_cmd for target operation. From this point
1557 * exceptions are handled by sending exception status via
1558 * target_core_fabric_ops->queue_status() callback
1560 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1561 data_length
, data_dir
, task_attr
, sense
);
1562 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1563 se_cmd
->unknown_data_length
= 1;
1565 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1566 * se_sess->sess_cmd_list. A second kref_get here is necessary
1567 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1568 * kref_put() to happen during fabric packet acknowledgement.
1570 target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1572 * Signal bidirectional data payloads to target-core
1574 if (flags
& TARGET_SCF_BIDI_OP
)
1575 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1577 * Locate se_lun pointer and attach it to struct se_cmd
1579 if (transport_lookup_cmd_lun(se_cmd
, unpacked_lun
) < 0) {
1580 transport_send_check_condition_and_sense(se_cmd
,
1581 se_cmd
->scsi_sense_reason
, 0);
1582 target_put_sess_cmd(se_sess
, se_cmd
);
1586 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1587 * allocate the necessary tasks to complete the received CDB+data
1589 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1591 transport_generic_request_failure(se_cmd
);
1596 * Check if we need to delay processing because of ALUA
1597 * Active/NonOptimized primary access state..
1599 core_alua_check_nonop_delay(se_cmd
);
1602 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1603 * for immediate execution of READs, otherwise wait for
1604 * transport_generic_handle_data() to be called for WRITEs
1605 * when fabric has filled the incoming buffer.
1607 transport_handle_cdb_direct(se_cmd
);
1610 EXPORT_SYMBOL(target_submit_cmd
);
1612 static void target_complete_tmr_failure(struct work_struct
*work
)
1614 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1616 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1617 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1618 transport_generic_free_cmd(se_cmd
, 0);
1622 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1625 * @se_cmd: command descriptor to submit
1626 * @se_sess: associated se_sess for endpoint
1627 * @sense: pointer to SCSI sense buffer
1628 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1629 * @fabric_context: fabric context for TMR req
1630 * @tm_type: Type of TM request
1631 * @gfp: gfp type for caller
1632 * @tag: referenced task tag for TMR_ABORT_TASK
1633 * @flags: submit cmd flags
1635 * Callable from all contexts.
1638 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1639 unsigned char *sense
, u32 unpacked_lun
,
1640 void *fabric_tmr_ptr
, unsigned char tm_type
,
1641 gfp_t gfp
, unsigned int tag
, int flags
)
1643 struct se_portal_group
*se_tpg
;
1646 se_tpg
= se_sess
->se_tpg
;
1649 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1650 0, DMA_NONE
, MSG_SIMPLE_TAG
, sense
);
1652 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1653 * allocation failure.
1655 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1659 if (tm_type
== TMR_ABORT_TASK
)
1660 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1662 /* See target_submit_cmd for commentary */
1663 target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1665 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1668 * For callback during failure handling, push this work off
1669 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1671 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1672 schedule_work(&se_cmd
->work
);
1675 transport_generic_handle_tmr(se_cmd
);
1678 EXPORT_SYMBOL(target_submit_tmr
);
1681 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1682 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1683 * complete setup in TCM process context w/ TFO->new_cmd_map().
1685 int transport_generic_handle_cdb_map(
1690 pr_err("cmd->se_lun is NULL\n");
1694 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
, false);
1697 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1699 /* transport_generic_handle_data():
1703 int transport_generic_handle_data(
1707 * For the software fabric case, then we assume the nexus is being
1708 * failed/shutdown when signals are pending from the kthread context
1709 * caller, so we return a failure. For the HW target mode case running
1710 * in interrupt code, the signal_pending() check is skipped.
1712 if (!in_interrupt() && signal_pending(current
))
1715 * If the received CDB has aleady been ABORTED by the generic
1716 * target engine, we now call transport_check_aborted_status()
1717 * to queue any delated TASK_ABORTED status for the received CDB to the
1718 * fabric module as we are expecting no further incoming DATA OUT
1719 * sequences at this point.
1721 if (transport_check_aborted_status(cmd
, 1) != 0)
1724 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
, false);
1727 EXPORT_SYMBOL(transport_generic_handle_data
);
1729 /* transport_generic_handle_tmr():
1733 int transport_generic_handle_tmr(
1736 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
, false);
1739 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1742 * If the cmd is active, request it to be stopped and sleep until it
1745 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1747 bool was_active
= false;
1749 if (cmd
->transport_state
& CMD_T_BUSY
) {
1750 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1751 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1753 pr_debug("cmd %p waiting to complete\n", cmd
);
1754 wait_for_completion(&cmd
->task_stop_comp
);
1755 pr_debug("cmd %p stopped successfully\n", cmd
);
1757 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1758 atomic_dec(&cmd
->t_task_cdbs_left
);
1759 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1760 cmd
->transport_state
&= ~CMD_T_BUSY
;
1768 * Handle SAM-esque emulation for generic transport request failures.
1770 void transport_generic_request_failure(struct se_cmd
*cmd
)
1774 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1775 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1776 cmd
->t_task_cdb
[0]);
1777 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1778 cmd
->se_tfo
->get_cmd_state(cmd
),
1779 cmd
->t_state
, cmd
->scsi_sense_reason
);
1780 pr_debug("-----[ t_task_cdbs_left: %d"
1781 " t_task_cdbs_ex_left: %d --"
1782 " CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1783 atomic_read(&cmd
->t_task_cdbs_left
),
1784 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1785 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1786 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1787 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1790 * For SAM Task Attribute emulation for failed struct se_cmd
1792 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1793 transport_complete_task_attr(cmd
);
1795 switch (cmd
->scsi_sense_reason
) {
1796 case TCM_NON_EXISTENT_LUN
:
1797 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1798 case TCM_INVALID_CDB_FIELD
:
1799 case TCM_INVALID_PARAMETER_LIST
:
1800 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1801 case TCM_UNKNOWN_MODE_PAGE
:
1802 case TCM_WRITE_PROTECTED
:
1803 case TCM_CHECK_CONDITION_ABORT_CMD
:
1804 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1805 case TCM_CHECK_CONDITION_NOT_READY
:
1807 case TCM_RESERVATION_CONFLICT
:
1809 * No SENSE Data payload for this case, set SCSI Status
1810 * and queue the response to $FABRIC_MOD.
1812 * Uses linux/include/scsi/scsi.h SAM status codes defs
1814 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1816 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1817 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1820 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1823 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1824 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1825 cmd
->orig_fe_lun
, 0x2C,
1826 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1828 ret
= cmd
->se_tfo
->queue_status(cmd
);
1829 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1833 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1834 cmd
->t_task_cdb
[0], cmd
->scsi_sense_reason
);
1835 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1839 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1840 * make the call to transport_send_check_condition_and_sense()
1841 * directly. Otherwise expect the fabric to make the call to
1842 * transport_send_check_condition_and_sense() after handling
1843 * possible unsoliticied write data payloads.
1845 ret
= transport_send_check_condition_and_sense(cmd
,
1846 cmd
->scsi_sense_reason
, 0);
1847 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1851 transport_lun_remove_cmd(cmd
);
1852 if (!transport_cmd_check_stop_to_fabric(cmd
))
1857 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1858 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1860 EXPORT_SYMBOL(transport_generic_request_failure
);
1862 static inline u32
transport_lba_21(unsigned char *cdb
)
1864 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
1867 static inline u32
transport_lba_32(unsigned char *cdb
)
1869 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1872 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
1874 unsigned int __v1
, __v2
;
1876 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1877 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1879 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1883 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1885 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
1887 unsigned int __v1
, __v2
;
1889 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
1890 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
1892 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1895 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
1897 unsigned long flags
;
1899 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
1900 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1901 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
1905 * Called from Fabric Module context from transport_execute_tasks()
1907 * The return of this function determins if the tasks from struct se_cmd
1908 * get added to the execution queue in transport_execute_tasks(),
1909 * or are added to the delayed or ordered lists here.
1911 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
1913 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1916 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1917 * to allow the passed struct se_cmd list of tasks to the front of the list.
1919 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1920 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1921 " 0x%02x, se_ordered_id: %u\n",
1923 cmd
->se_ordered_id
);
1925 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1926 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
1927 smp_mb__after_atomic_inc();
1929 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1930 " list, se_ordered_id: %u\n",
1932 cmd
->se_ordered_id
);
1934 * Add ORDERED command to tail of execution queue if
1935 * no other older commands exist that need to be
1938 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
1942 * For SIMPLE and UNTAGGED Task Attribute commands
1944 atomic_inc(&cmd
->se_dev
->simple_cmds
);
1945 smp_mb__after_atomic_inc();
1948 * Otherwise if one or more outstanding ORDERED task attribute exist,
1949 * add the dormant task(s) built for the passed struct se_cmd to the
1950 * execution queue and become in Active state for this struct se_device.
1952 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
1954 * Otherwise, add cmd w/ tasks to delayed cmd queue that
1955 * will be drained upon completion of HEAD_OF_QUEUE task.
1957 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
1958 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
1959 list_add_tail(&cmd
->se_delayed_node
,
1960 &cmd
->se_dev
->delayed_cmd_list
);
1961 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
1963 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1964 " delayed CMD list, se_ordered_id: %u\n",
1965 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1966 cmd
->se_ordered_id
);
1968 * Return zero to let transport_execute_tasks() know
1969 * not to add the delayed tasks to the execution list.
1974 * Otherwise, no ORDERED task attributes exist..
1980 * Called from fabric module context in transport_generic_new_cmd() and
1981 * transport_generic_process_write()
1983 static int transport_execute_tasks(struct se_cmd
*cmd
)
1986 struct se_device
*se_dev
= cmd
->se_dev
;
1988 * Call transport_cmd_check_stop() to see if a fabric exception
1989 * has occurred that prevents execution.
1991 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
1993 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
1994 * attribute for the tasks of the received struct se_cmd CDB
1996 add_tasks
= transport_execute_task_attr(cmd
);
2000 __transport_execute_tasks(se_dev
, cmd
);
2005 __transport_execute_tasks(se_dev
, NULL
);
2009 static int __transport_execute_tasks(struct se_device
*dev
, struct se_cmd
*new_cmd
)
2012 struct se_cmd
*cmd
= NULL
;
2013 unsigned long flags
;
2016 spin_lock_irq(&dev
->execute_task_lock
);
2017 if (new_cmd
!= NULL
)
2018 __target_add_to_execute_list(new_cmd
);
2020 if (list_empty(&dev
->execute_list
)) {
2021 spin_unlock_irq(&dev
->execute_task_lock
);
2024 cmd
= list_first_entry(&dev
->execute_list
, struct se_cmd
, execute_list
);
2025 __target_remove_from_execute_list(cmd
);
2026 spin_unlock_irq(&dev
->execute_task_lock
);
2028 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2029 cmd
->transport_state
|= CMD_T_BUSY
;
2030 cmd
->transport_state
|= CMD_T_SENT
;
2032 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2034 if (cmd
->execute_cmd
)
2035 error
= cmd
->execute_cmd(cmd
);
2037 error
= dev
->transport
->execute_cmd(cmd
, cmd
->t_data_sg
,
2038 cmd
->t_data_nents
, cmd
->data_direction
);
2042 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2043 cmd
->transport_state
&= ~CMD_T_BUSY
;
2044 cmd
->transport_state
&= ~CMD_T_SENT
;
2045 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2047 transport_generic_request_failure(cmd
);
2056 static inline u32
transport_get_sectors_6(
2061 struct se_device
*dev
= cmd
->se_dev
;
2064 * Assume TYPE_DISK for non struct se_device objects.
2065 * Use 8-bit sector value.
2071 * Use 24-bit allocation length for TYPE_TAPE.
2073 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2074 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2077 * Everything else assume TYPE_DISK Sector CDB location.
2078 * Use 8-bit sector value. SBC-3 says:
2080 * A TRANSFER LENGTH field set to zero specifies that 256
2081 * logical blocks shall be written. Any other value
2082 * specifies the number of logical blocks that shall be
2086 return cdb
[4] ? : 256;
2089 static inline u32
transport_get_sectors_10(
2094 struct se_device
*dev
= cmd
->se_dev
;
2097 * Assume TYPE_DISK for non struct se_device objects.
2098 * Use 16-bit sector value.
2104 * XXX_10 is not defined in SSC, throw an exception
2106 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2112 * Everything else assume TYPE_DISK Sector CDB location.
2113 * Use 16-bit sector value.
2116 return (u32
)(cdb
[7] << 8) + cdb
[8];
2119 static inline u32
transport_get_sectors_12(
2124 struct se_device
*dev
= cmd
->se_dev
;
2127 * Assume TYPE_DISK for non struct se_device objects.
2128 * Use 32-bit sector value.
2134 * XXX_12 is not defined in SSC, throw an exception
2136 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2142 * Everything else assume TYPE_DISK Sector CDB location.
2143 * Use 32-bit sector value.
2146 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2149 static inline u32
transport_get_sectors_16(
2154 struct se_device
*dev
= cmd
->se_dev
;
2157 * Assume TYPE_DISK for non struct se_device objects.
2158 * Use 32-bit sector value.
2164 * Use 24-bit allocation length for TYPE_TAPE.
2166 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2167 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2170 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2171 (cdb
[12] << 8) + cdb
[13];
2175 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2177 static inline u32
transport_get_sectors_32(
2183 * Assume TYPE_DISK for non struct se_device objects.
2184 * Use 32-bit sector value.
2186 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2187 (cdb
[30] << 8) + cdb
[31];
2191 static inline u32
transport_get_size(
2196 struct se_device
*dev
= cmd
->se_dev
;
2198 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2199 if (cdb
[1] & 1) { /* sectors */
2200 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2205 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2206 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
,
2207 sectors
, dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2208 dev
->transport
->name
);
2210 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2213 static void transport_xor_callback(struct se_cmd
*cmd
)
2215 unsigned char *buf
, *addr
;
2216 struct scatterlist
*sg
;
2217 unsigned int offset
;
2221 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2223 * 1) read the specified logical block(s);
2224 * 2) transfer logical blocks from the data-out buffer;
2225 * 3) XOR the logical blocks transferred from the data-out buffer with
2226 * the logical blocks read, storing the resulting XOR data in a buffer;
2227 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2228 * blocks transferred from the data-out buffer; and
2229 * 5) transfer the resulting XOR data to the data-in buffer.
2231 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2233 pr_err("Unable to allocate xor_callback buf\n");
2237 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2238 * into the locally allocated *buf
2240 sg_copy_to_buffer(cmd
->t_data_sg
,
2246 * Now perform the XOR against the BIDI read memory located at
2247 * cmd->t_mem_bidi_list
2251 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2252 addr
= kmap_atomic(sg_page(sg
));
2256 for (i
= 0; i
< sg
->length
; i
++)
2257 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2259 offset
+= sg
->length
;
2260 kunmap_atomic(addr
);
2268 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2270 static int transport_get_sense_data(struct se_cmd
*cmd
)
2272 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2273 struct se_device
*dev
= cmd
->se_dev
;
2274 unsigned long flags
;
2277 WARN_ON(!cmd
->se_lun
);
2282 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2283 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2284 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2288 if (!(cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2291 if (!dev
->transport
->get_sense_buffer
) {
2292 pr_err("dev->transport->get_sense_buffer is NULL\n");
2296 sense_buffer
= dev
->transport
->get_sense_buffer(cmd
);
2297 if (!sense_buffer
) {
2298 pr_err("ITT 0x%08x cmd %p: Unable to locate"
2299 " sense buffer for task with sense\n",
2300 cmd
->se_tfo
->get_task_tag(cmd
), cmd
);
2304 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2306 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
, TRANSPORT_SENSE_BUFFER
);
2308 memcpy(&buffer
[offset
], sense_buffer
, TRANSPORT_SENSE_BUFFER
);
2310 /* Automatically padded */
2311 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
2313 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2314 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
2318 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2322 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2324 return dev
->transport
->get_blocks(dev
) + 1;
2327 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2329 struct se_device
*dev
= cmd
->se_dev
;
2332 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2335 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2337 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2338 pr_err("LBA: %llu Sectors: %u exceeds"
2339 " transport_dev_end_lba(): %llu\n",
2340 cmd
->t_task_lba
, sectors
,
2341 transport_dev_end_lba(dev
));
2348 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2351 * Determine if the received WRITE_SAME is used to for direct
2352 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2353 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2354 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2356 int passthrough
= (dev
->transport
->transport_type
==
2357 TRANSPORT_PLUGIN_PHBA_PDEV
);
2360 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2361 pr_err("WRITE_SAME PBDATA and LBDATA"
2362 " bits not supported for Block Discard"
2367 * Currently for the emulated case we only accept
2368 * tpws with the UNMAP=1 bit set.
2370 if (!(flags
[0] & 0x08)) {
2371 pr_err("WRITE_SAME w/o UNMAP bit not"
2372 " supported for Block Discard Emulation\n");
2380 /* transport_generic_cmd_sequencer():
2382 * Generic Command Sequencer that should work for most DAS transport
2385 * Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
2388 * FIXME: Need to support other SCSI OPCODES where as well.
2390 static int transport_generic_cmd_sequencer(
2394 struct se_device
*dev
= cmd
->se_dev
;
2395 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2396 int ret
= 0, sector_ret
= 0, passthrough
;
2397 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2401 * Check for an existing UNIT ATTENTION condition
2403 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2404 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2405 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2409 * Check status of Asymmetric Logical Unit Assignment port
2411 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2414 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2415 * The ALUA additional sense code qualifier (ASCQ) is determined
2416 * by the ALUA primary or secondary access state..
2419 pr_debug("[%s]: ALUA TG Port not available,"
2420 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2421 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2423 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2424 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2425 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2428 goto out_invalid_cdb_field
;
2431 * Check status for SPC-3 Persistent Reservations
2433 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2434 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2435 cmd
, cdb
, pr_reg_type
) != 0) {
2436 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2437 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2438 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2439 cmd
->scsi_sense_reason
= TCM_RESERVATION_CONFLICT
;
2443 * This means the CDB is allowed for the SCSI Initiator port
2444 * when said port is *NOT* holding the legacy SPC-2 or
2445 * SPC-3 Persistent Reservation.
2450 * If we operate in passthrough mode we skip most CDB emulation and
2451 * instead hand the commands down to the physical SCSI device.
2454 (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
);
2458 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2460 goto out_unsupported_cdb
;
2461 size
= transport_get_size(sectors
, cdb
, cmd
);
2462 cmd
->t_task_lba
= transport_lba_21(cdb
);
2463 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2466 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2468 goto out_unsupported_cdb
;
2469 size
= transport_get_size(sectors
, cdb
, cmd
);
2470 cmd
->t_task_lba
= transport_lba_32(cdb
);
2471 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2474 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2476 goto out_unsupported_cdb
;
2477 size
= transport_get_size(sectors
, cdb
, cmd
);
2478 cmd
->t_task_lba
= transport_lba_32(cdb
);
2479 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2482 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2484 goto out_unsupported_cdb
;
2485 size
= transport_get_size(sectors
, cdb
, cmd
);
2486 cmd
->t_task_lba
= transport_lba_64(cdb
);
2487 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2490 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2492 goto out_unsupported_cdb
;
2493 size
= transport_get_size(sectors
, cdb
, cmd
);
2494 cmd
->t_task_lba
= transport_lba_21(cdb
);
2495 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2498 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2500 goto out_unsupported_cdb
;
2501 size
= transport_get_size(sectors
, cdb
, cmd
);
2502 cmd
->t_task_lba
= transport_lba_32(cdb
);
2504 cmd
->se_cmd_flags
|= SCF_FUA
;
2505 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2508 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2510 goto out_unsupported_cdb
;
2511 size
= transport_get_size(sectors
, cdb
, cmd
);
2512 cmd
->t_task_lba
= transport_lba_32(cdb
);
2514 cmd
->se_cmd_flags
|= SCF_FUA
;
2515 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2518 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2520 goto out_unsupported_cdb
;
2521 size
= transport_get_size(sectors
, cdb
, cmd
);
2522 cmd
->t_task_lba
= transport_lba_64(cdb
);
2524 cmd
->se_cmd_flags
|= SCF_FUA
;
2525 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2527 case XDWRITEREAD_10
:
2528 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2529 !(cmd
->se_cmd_flags
& SCF_BIDI
))
2530 goto out_invalid_cdb_field
;
2531 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2533 goto out_unsupported_cdb
;
2534 size
= transport_get_size(sectors
, cdb
, cmd
);
2535 cmd
->t_task_lba
= transport_lba_32(cdb
);
2536 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2539 * Do now allow BIDI commands for passthrough mode.
2542 goto out_unsupported_cdb
;
2545 * Setup BIDI XOR callback to be run after I/O completion.
2547 cmd
->transport_complete_callback
= &transport_xor_callback
;
2549 cmd
->se_cmd_flags
|= SCF_FUA
;
2551 case VARIABLE_LENGTH_CMD
:
2552 service_action
= get_unaligned_be16(&cdb
[8]);
2553 switch (service_action
) {
2554 case XDWRITEREAD_32
:
2555 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2557 goto out_unsupported_cdb
;
2558 size
= transport_get_size(sectors
, cdb
, cmd
);
2560 * Use WRITE_32 and READ_32 opcodes for the emulated
2561 * XDWRITE_READ_32 logic.
2563 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2564 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2567 * Do now allow BIDI commands for passthrough mode.
2570 goto out_unsupported_cdb
;
2573 * Setup BIDI XOR callback to be run during after I/O
2576 cmd
->transport_complete_callback
= &transport_xor_callback
;
2578 cmd
->se_cmd_flags
|= SCF_FUA
;
2581 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2583 goto out_unsupported_cdb
;
2586 size
= transport_get_size(1, cdb
, cmd
);
2588 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2590 goto out_invalid_cdb_field
;
2593 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2594 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2596 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2597 goto out_unsupported_cdb
;
2599 cmd
->execute_cmd
= target_emulate_write_same
;
2602 pr_err("VARIABLE_LENGTH_CMD service action"
2603 " 0x%04x not supported\n", service_action
);
2604 goto out_unsupported_cdb
;
2607 case MAINTENANCE_IN
:
2608 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2609 /* MAINTENANCE_IN from SCC-2 */
2611 * Check for emulated MI_REPORT_TARGET_PGS.
2613 if (cdb
[1] == MI_REPORT_TARGET_PGS
&&
2614 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2616 target_emulate_report_target_port_groups
;
2618 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2619 (cdb
[8] << 8) | cdb
[9];
2621 /* GPCMD_SEND_KEY from multi media commands */
2622 size
= (cdb
[8] << 8) + cdb
[9];
2624 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2628 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2630 case MODE_SELECT_10
:
2631 size
= (cdb
[7] << 8) + cdb
[8];
2632 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2636 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2638 cmd
->execute_cmd
= target_emulate_modesense
;
2641 size
= (cdb
[7] << 8) + cdb
[8];
2642 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2644 cmd
->execute_cmd
= target_emulate_modesense
;
2646 case GPCMD_READ_BUFFER_CAPACITY
:
2647 case GPCMD_SEND_OPC
:
2650 size
= (cdb
[7] << 8) + cdb
[8];
2651 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2653 case READ_BLOCK_LIMITS
:
2654 size
= READ_BLOCK_LEN
;
2655 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2657 case GPCMD_GET_CONFIGURATION
:
2658 case GPCMD_READ_FORMAT_CAPACITIES
:
2659 case GPCMD_READ_DISC_INFO
:
2660 case GPCMD_READ_TRACK_RZONE_INFO
:
2661 size
= (cdb
[7] << 8) + cdb
[8];
2662 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2664 case PERSISTENT_RESERVE_IN
:
2665 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2666 cmd
->execute_cmd
= target_scsi3_emulate_pr_in
;
2667 size
= (cdb
[7] << 8) + cdb
[8];
2668 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2670 case PERSISTENT_RESERVE_OUT
:
2671 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2672 cmd
->execute_cmd
= target_scsi3_emulate_pr_out
;
2673 size
= (cdb
[7] << 8) + cdb
[8];
2674 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2676 case GPCMD_MECHANISM_STATUS
:
2677 case GPCMD_READ_DVD_STRUCTURE
:
2678 size
= (cdb
[8] << 8) + cdb
[9];
2679 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2682 size
= READ_POSITION_LEN
;
2683 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2685 case MAINTENANCE_OUT
:
2686 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2687 /* MAINTENANCE_OUT from SCC-2
2689 * Check for emulated MO_SET_TARGET_PGS.
2691 if (cdb
[1] == MO_SET_TARGET_PGS
&&
2692 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2694 target_emulate_set_target_port_groups
;
2697 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2698 (cdb
[8] << 8) | cdb
[9];
2700 /* GPCMD_REPORT_KEY from multi media commands */
2701 size
= (cdb
[8] << 8) + cdb
[9];
2703 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2706 size
= (cdb
[3] << 8) + cdb
[4];
2708 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2709 * See spc4r17 section 5.3
2711 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2712 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
2713 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2715 cmd
->execute_cmd
= target_emulate_inquiry
;
2718 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2719 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2722 size
= READ_CAP_LEN
;
2723 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2725 cmd
->execute_cmd
= target_emulate_readcapacity
;
2727 case READ_MEDIA_SERIAL_NUMBER
:
2728 case SECURITY_PROTOCOL_IN
:
2729 case SECURITY_PROTOCOL_OUT
:
2730 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2731 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2733 case SERVICE_ACTION_IN
:
2734 switch (cmd
->t_task_cdb
[1] & 0x1f) {
2735 case SAI_READ_CAPACITY_16
:
2738 target_emulate_readcapacity_16
;
2744 pr_err("Unsupported SA: 0x%02x\n",
2745 cmd
->t_task_cdb
[1] & 0x1f);
2746 goto out_invalid_cdb_field
;
2749 case ACCESS_CONTROL_IN
:
2750 case ACCESS_CONTROL_OUT
:
2752 case READ_ATTRIBUTE
:
2753 case RECEIVE_COPY_RESULTS
:
2754 case WRITE_ATTRIBUTE
:
2755 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
2756 (cdb
[12] << 8) | cdb
[13];
2757 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2759 case RECEIVE_DIAGNOSTIC
:
2760 case SEND_DIAGNOSTIC
:
2761 size
= (cdb
[3] << 8) | cdb
[4];
2762 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2764 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2767 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2768 size
= (2336 * sectors
);
2769 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2774 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2778 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2780 cmd
->execute_cmd
= target_emulate_request_sense
;
2782 case READ_ELEMENT_STATUS
:
2783 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
2784 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2787 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2788 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2793 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2794 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2796 if (cdb
[0] == RESERVE_10
)
2797 size
= (cdb
[7] << 8) | cdb
[8];
2799 size
= cmd
->data_length
;
2802 * Setup the legacy emulated handler for SPC-2 and
2803 * >= SPC-3 compatible reservation handling (CRH=1)
2804 * Otherwise, we assume the underlying SCSI logic is
2805 * is running in SPC_PASSTHROUGH, and wants reservations
2806 * emulation disabled.
2808 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2809 cmd
->execute_cmd
= target_scsi2_reservation_reserve
;
2810 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2815 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2816 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2818 if (cdb
[0] == RELEASE_10
)
2819 size
= (cdb
[7] << 8) | cdb
[8];
2821 size
= cmd
->data_length
;
2823 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2824 cmd
->execute_cmd
= target_scsi2_reservation_release
;
2825 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2827 case SYNCHRONIZE_CACHE
:
2828 case SYNCHRONIZE_CACHE_16
:
2830 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2832 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
2833 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2834 cmd
->t_task_lba
= transport_lba_32(cdb
);
2836 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2837 cmd
->t_task_lba
= transport_lba_64(cdb
);
2840 goto out_unsupported_cdb
;
2842 size
= transport_get_size(sectors
, cdb
, cmd
);
2843 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2849 * Check to ensure that LBA + Range does not exceed past end of
2850 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2852 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
2853 if (transport_cmd_get_valid_sectors(cmd
) < 0)
2854 goto out_invalid_cdb_field
;
2856 cmd
->execute_cmd
= target_emulate_synchronize_cache
;
2859 size
= get_unaligned_be16(&cdb
[7]);
2860 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2862 cmd
->execute_cmd
= target_emulate_unmap
;
2865 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2867 goto out_unsupported_cdb
;
2870 size
= transport_get_size(1, cdb
, cmd
);
2872 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2873 goto out_invalid_cdb_field
;
2876 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
2877 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2879 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2880 goto out_unsupported_cdb
;
2882 cmd
->execute_cmd
= target_emulate_write_same
;
2885 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2887 goto out_unsupported_cdb
;
2890 size
= transport_get_size(1, cdb
, cmd
);
2892 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2893 goto out_invalid_cdb_field
;
2896 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
2897 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2899 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2900 * of byte 1 bit 3 UNMAP instead of original reserved field
2902 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2903 goto out_unsupported_cdb
;
2905 cmd
->execute_cmd
= target_emulate_write_same
;
2907 case ALLOW_MEDIUM_REMOVAL
:
2913 case TEST_UNIT_READY
:
2915 case WRITE_FILEMARKS
:
2916 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2918 cmd
->execute_cmd
= target_emulate_noop
;
2920 case GPCMD_CLOSE_TRACK
:
2921 case INITIALIZE_ELEMENT_STATUS
:
2922 case GPCMD_LOAD_UNLOAD
:
2923 case GPCMD_SET_SPEED
:
2925 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2928 cmd
->execute_cmd
= target_report_luns
;
2929 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2931 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2932 * See spc4r17 section 5.3
2934 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2935 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
2936 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2938 case GET_EVENT_STATUS_NOTIFICATION
:
2939 size
= (cdb
[7] << 8) | cdb
[8];
2940 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2943 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
2944 " 0x%02x, sending CHECK_CONDITION.\n",
2945 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
2946 goto out_unsupported_cdb
;
2949 if (cmd
->unknown_data_length
)
2950 cmd
->data_length
= size
;
2952 if (size
!= cmd
->data_length
) {
2953 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
2954 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
2955 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
2956 cmd
->data_length
, size
, cdb
[0]);
2958 cmd
->cmd_spdtl
= size
;
2960 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
2961 pr_err("Rejecting underflow/overflow"
2963 goto out_invalid_cdb_field
;
2966 * Reject READ_* or WRITE_* with overflow/underflow for
2967 * type SCF_SCSI_DATA_SG_IO_CDB.
2969 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
2970 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
2971 " CDB on non 512-byte sector setup subsystem"
2972 " plugin: %s\n", dev
->transport
->name
);
2973 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
2974 goto out_invalid_cdb_field
;
2977 if (size
> cmd
->data_length
) {
2978 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
2979 cmd
->residual_count
= (size
- cmd
->data_length
);
2981 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
2982 cmd
->residual_count
= (cmd
->data_length
- size
);
2984 cmd
->data_length
= size
;
2987 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
&&
2988 (sectors
> dev
->se_sub_dev
->se_dev_attrib
.fabric_max_sectors
||
2989 sectors
> dev
->se_sub_dev
->se_dev_attrib
.max_sectors
)) {
2990 printk_ratelimited(KERN_ERR
"SCSI OP %02xh with too big sectors %u\n",
2992 goto out_invalid_cdb_field
;
2995 /* reject any command that we don't have a handler for */
2996 if (!(passthrough
|| cmd
->execute_cmd
||
2997 (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2998 goto out_unsupported_cdb
;
3000 transport_set_supported_SAM_opcode(cmd
);
3003 out_unsupported_cdb
:
3004 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3005 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3007 out_invalid_cdb_field
:
3008 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3009 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3014 * Called from I/O completion to determine which dormant/delayed
3015 * and ordered cmds need to have their tasks added to the execution queue.
3017 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3019 struct se_device
*dev
= cmd
->se_dev
;
3020 struct se_cmd
*cmd_p
, *cmd_tmp
;
3021 int new_active_tasks
= 0;
3023 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3024 atomic_dec(&dev
->simple_cmds
);
3025 smp_mb__after_atomic_dec();
3026 dev
->dev_cur_ordered_id
++;
3027 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3028 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3029 cmd
->se_ordered_id
);
3030 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3031 dev
->dev_cur_ordered_id
++;
3032 pr_debug("Incremented dev_cur_ordered_id: %u for"
3033 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3034 cmd
->se_ordered_id
);
3035 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3036 atomic_dec(&dev
->dev_ordered_sync
);
3037 smp_mb__after_atomic_dec();
3039 dev
->dev_cur_ordered_id
++;
3040 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3041 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3044 * Process all commands up to the last received
3045 * ORDERED task attribute which requires another blocking
3048 spin_lock(&dev
->delayed_cmd_lock
);
3049 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3050 &dev
->delayed_cmd_list
, se_delayed_node
) {
3052 list_del(&cmd_p
->se_delayed_node
);
3053 spin_unlock(&dev
->delayed_cmd_lock
);
3055 pr_debug("Calling add_tasks() for"
3056 " cmd_p: 0x%02x Task Attr: 0x%02x"
3057 " Dormant -> Active, se_ordered_id: %u\n",
3058 cmd_p
->t_task_cdb
[0],
3059 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3061 target_add_to_execute_list(cmd_p
);
3064 spin_lock(&dev
->delayed_cmd_lock
);
3065 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3068 spin_unlock(&dev
->delayed_cmd_lock
);
3070 * If new tasks have become active, wake up the transport thread
3071 * to do the processing of the Active tasks.
3073 if (new_active_tasks
!= 0)
3074 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3077 static void transport_complete_qf(struct se_cmd
*cmd
)
3081 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3082 transport_complete_task_attr(cmd
);
3084 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3085 ret
= cmd
->se_tfo
->queue_status(cmd
);
3090 switch (cmd
->data_direction
) {
3091 case DMA_FROM_DEVICE
:
3092 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3095 if (cmd
->t_bidi_data_sg
) {
3096 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3100 /* Fall through for DMA_TO_DEVICE */
3102 ret
= cmd
->se_tfo
->queue_status(cmd
);
3110 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3113 transport_lun_remove_cmd(cmd
);
3114 transport_cmd_check_stop_to_fabric(cmd
);
3117 static void transport_handle_queue_full(
3119 struct se_device
*dev
)
3121 spin_lock_irq(&dev
->qf_cmd_lock
);
3122 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3123 atomic_inc(&dev
->dev_qf_count
);
3124 smp_mb__after_atomic_inc();
3125 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3127 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3130 static void target_complete_ok_work(struct work_struct
*work
)
3132 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3133 int reason
= 0, ret
;
3136 * Check if we need to move delayed/dormant tasks from cmds on the
3137 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3140 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3141 transport_complete_task_attr(cmd
);
3143 * Check to schedule QUEUE_FULL work, or execute an existing
3144 * cmd->transport_qf_callback()
3146 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3147 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3150 * Check if we need to retrieve a sense buffer from
3151 * the struct se_cmd in question.
3153 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3154 if (transport_get_sense_data(cmd
) < 0)
3155 reason
= TCM_NON_EXISTENT_LUN
;
3157 if (cmd
->scsi_status
) {
3158 ret
= transport_send_check_condition_and_sense(
3160 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3163 transport_lun_remove_cmd(cmd
);
3164 transport_cmd_check_stop_to_fabric(cmd
);
3169 * Check for a callback, used by amongst other things
3170 * XDWRITE_READ_10 emulation.
3172 if (cmd
->transport_complete_callback
)
3173 cmd
->transport_complete_callback(cmd
);
3175 switch (cmd
->data_direction
) {
3176 case DMA_FROM_DEVICE
:
3177 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3178 if (cmd
->se_lun
->lun_sep
) {
3179 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3182 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3184 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3185 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3189 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3190 if (cmd
->se_lun
->lun_sep
) {
3191 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3194 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3196 * Check if we need to send READ payload for BIDI-COMMAND
3198 if (cmd
->t_bidi_data_sg
) {
3199 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3200 if (cmd
->se_lun
->lun_sep
) {
3201 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3204 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3205 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3206 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3210 /* Fall through for DMA_TO_DEVICE */
3212 ret
= cmd
->se_tfo
->queue_status(cmd
);
3213 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3220 transport_lun_remove_cmd(cmd
);
3221 transport_cmd_check_stop_to_fabric(cmd
);
3225 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3226 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3227 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3228 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3231 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3233 struct scatterlist
*sg
;
3236 for_each_sg(sgl
, sg
, nents
, count
)
3237 __free_page(sg_page(sg
));
3242 static inline void transport_free_pages(struct se_cmd
*cmd
)
3244 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3247 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3248 cmd
->t_data_sg
= NULL
;
3249 cmd
->t_data_nents
= 0;
3251 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3252 cmd
->t_bidi_data_sg
= NULL
;
3253 cmd
->t_bidi_data_nents
= 0;
3257 * transport_release_cmd - free a command
3258 * @cmd: command to free
3260 * This routine unconditionally frees a command, and reference counting
3261 * or list removal must be done in the caller.
3263 static void transport_release_cmd(struct se_cmd
*cmd
)
3265 BUG_ON(!cmd
->se_tfo
);
3267 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
3268 core_tmr_release_req(cmd
->se_tmr_req
);
3269 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
3270 kfree(cmd
->t_task_cdb
);
3272 * If this cmd has been setup with target_get_sess_cmd(), drop
3273 * the kref and call ->release_cmd() in kref callback.
3275 if (cmd
->check_release
!= 0) {
3276 target_put_sess_cmd(cmd
->se_sess
, cmd
);
3279 cmd
->se_tfo
->release_cmd(cmd
);
3283 * transport_put_cmd - release a reference to a command
3284 * @cmd: command to release
3286 * This routine releases our reference to the command and frees it if possible.
3288 static void transport_put_cmd(struct se_cmd
*cmd
)
3290 unsigned long flags
;
3292 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3293 if (atomic_read(&cmd
->t_fe_count
)) {
3294 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3298 if (atomic_read(&cmd
->t_se_count
)) {
3299 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3303 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
3304 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
3305 target_remove_from_state_list(cmd
);
3307 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3309 transport_free_pages(cmd
);
3310 transport_release_cmd(cmd
);
3313 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3317 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3318 * allocating in the core.
3319 * @cmd: Associated se_cmd descriptor
3320 * @mem: SGL style memory for TCM WRITE / READ
3321 * @sg_mem_num: Number of SGL elements
3322 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3323 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3325 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3328 int transport_generic_map_mem_to_cmd(
3330 struct scatterlist
*sgl
,
3332 struct scatterlist
*sgl_bidi
,
3335 if (!sgl
|| !sgl_count
)
3338 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3339 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3341 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3342 * scatterlists already have been set to follow what the fabric
3343 * passes for the original expected data transfer length.
3345 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3346 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3347 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3348 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3349 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3353 cmd
->t_data_sg
= sgl
;
3354 cmd
->t_data_nents
= sgl_count
;
3356 if (sgl_bidi
&& sgl_bidi_count
) {
3357 cmd
->t_bidi_data_sg
= sgl_bidi
;
3358 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3360 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3365 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3367 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
3369 struct scatterlist
*sg
= cmd
->t_data_sg
;
3370 struct page
**pages
;
3375 * We need to take into account a possible offset here for fabrics like
3376 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3377 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3379 if (!cmd
->t_data_nents
)
3381 else if (cmd
->t_data_nents
== 1)
3382 return kmap(sg_page(sg
)) + sg
->offset
;
3384 /* >1 page. use vmap */
3385 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
3389 /* convert sg[] to pages[] */
3390 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
3391 pages
[i
] = sg_page(sg
);
3394 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
3396 if (!cmd
->t_data_vmap
)
3399 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
3401 EXPORT_SYMBOL(transport_kmap_data_sg
);
3403 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
3405 if (!cmd
->t_data_nents
) {
3407 } else if (cmd
->t_data_nents
== 1) {
3408 kunmap(sg_page(cmd
->t_data_sg
));
3412 vunmap(cmd
->t_data_vmap
);
3413 cmd
->t_data_vmap
= NULL
;
3415 EXPORT_SYMBOL(transport_kunmap_data_sg
);
3418 transport_generic_get_mem(struct se_cmd
*cmd
)
3420 u32 length
= cmd
->data_length
;
3426 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3427 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3428 if (!cmd
->t_data_sg
)
3431 cmd
->t_data_nents
= nents
;
3432 sg_init_table(cmd
->t_data_sg
, nents
);
3434 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
? 0 : __GFP_ZERO
;
3437 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3438 page
= alloc_page(GFP_KERNEL
| zero_flag
);
3442 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3450 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3453 kfree(cmd
->t_data_sg
);
3454 cmd
->t_data_sg
= NULL
;
3459 * Allocate any required resources to execute the command. For writes we
3460 * might not have the payload yet, so notify the fabric via a call to
3461 * ->write_pending instead. Otherwise place it on the execution queue.
3463 int transport_generic_new_cmd(struct se_cmd
*cmd
)
3465 struct se_device
*dev
= cmd
->se_dev
;
3469 * Determine is the TCM fabric module has already allocated physical
3470 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3473 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
3475 ret
= transport_generic_get_mem(cmd
);
3480 /* Workaround for handling zero-length control CDBs */
3481 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3482 !cmd
->data_length
) {
3483 spin_lock_irq(&cmd
->t_state_lock
);
3484 cmd
->t_state
= TRANSPORT_COMPLETE
;
3485 cmd
->transport_state
|= CMD_T_ACTIVE
;
3486 spin_unlock_irq(&cmd
->t_state_lock
);
3488 if (cmd
->t_task_cdb
[0] == REQUEST_SENSE
) {
3489 u8 ua_asc
= 0, ua_ascq
= 0;
3491 core_scsi3_ua_clear_for_request_sense(cmd
,
3495 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
3496 queue_work(target_completion_wq
, &cmd
->work
);
3500 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
3501 struct se_dev_attrib
*attr
= &dev
->se_sub_dev
->se_dev_attrib
;
3503 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3506 BUG_ON(cmd
->data_length
% attr
->block_size
);
3507 BUG_ON(DIV_ROUND_UP(cmd
->data_length
, attr
->block_size
) >
3511 atomic_inc(&cmd
->t_fe_count
);
3512 atomic_inc(&cmd
->t_se_count
);
3514 atomic_set(&cmd
->t_task_cdbs_left
, 1);
3515 atomic_set(&cmd
->t_task_cdbs_ex_left
, 1);
3518 * For WRITEs, let the fabric know its buffer is ready.
3520 * The command will be added to the execution queue after its write
3523 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3524 target_add_to_state_list(cmd
);
3525 return transport_generic_write_pending(cmd
);
3528 * Everything else but a WRITE, add the command to the execution queue.
3530 transport_execute_tasks(cmd
);
3534 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3535 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3538 EXPORT_SYMBOL(transport_generic_new_cmd
);
3540 /* transport_generic_process_write():
3544 void transport_generic_process_write(struct se_cmd
*cmd
)
3546 transport_execute_tasks(cmd
);
3548 EXPORT_SYMBOL(transport_generic_process_write
);
3550 static void transport_write_pending_qf(struct se_cmd
*cmd
)
3554 ret
= cmd
->se_tfo
->write_pending(cmd
);
3555 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
3556 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3558 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3562 static int transport_generic_write_pending(struct se_cmd
*cmd
)
3564 unsigned long flags
;
3567 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3568 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
3569 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3572 * Clear the se_cmd for WRITE_PENDING status in order to set
3573 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3574 * from HW target mode interrupt code. This is safe to be called
3575 * with transport_off=1 before the cmd->se_tfo->write_pending
3576 * because the se_cmd->se_lun pointer is not being cleared.
3578 transport_cmd_check_stop(cmd
, 1, 0);
3581 * Call the fabric write_pending function here to let the
3582 * frontend know that WRITE buffers are ready.
3584 ret
= cmd
->se_tfo
->write_pending(cmd
);
3585 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3593 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
3594 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
3595 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3599 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
3601 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
3602 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
3603 transport_wait_for_tasks(cmd
);
3605 transport_release_cmd(cmd
);
3608 transport_wait_for_tasks(cmd
);
3610 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
3613 transport_lun_remove_cmd(cmd
);
3615 transport_put_cmd(cmd
);
3618 EXPORT_SYMBOL(transport_generic_free_cmd
);
3620 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3621 * @se_sess: session to reference
3622 * @se_cmd: command descriptor to add
3623 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
3625 void target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
3628 unsigned long flags
;
3630 kref_init(&se_cmd
->cmd_kref
);
3632 * Add a second kref if the fabric caller is expecting to handle
3633 * fabric acknowledgement that requires two target_put_sess_cmd()
3634 * invocations before se_cmd descriptor release.
3636 if (ack_kref
== true) {
3637 kref_get(&se_cmd
->cmd_kref
);
3638 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
3641 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3642 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
3643 se_cmd
->check_release
= 1;
3644 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3646 EXPORT_SYMBOL(target_get_sess_cmd
);
3648 static void target_release_cmd_kref(struct kref
*kref
)
3650 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
3651 struct se_session
*se_sess
= se_cmd
->se_sess
;
3652 unsigned long flags
;
3654 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3655 if (list_empty(&se_cmd
->se_cmd_list
)) {
3656 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3657 se_cmd
->se_tfo
->release_cmd(se_cmd
);
3660 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
3661 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3662 complete(&se_cmd
->cmd_wait_comp
);
3665 list_del(&se_cmd
->se_cmd_list
);
3666 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3668 se_cmd
->se_tfo
->release_cmd(se_cmd
);
3671 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3672 * @se_sess: session to reference
3673 * @se_cmd: command descriptor to drop
3675 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
3677 return kref_put(&se_cmd
->cmd_kref
, target_release_cmd_kref
);
3679 EXPORT_SYMBOL(target_put_sess_cmd
);
3681 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3682 * @se_sess: session to split
3684 void target_splice_sess_cmd_list(struct se_session
*se_sess
)
3686 struct se_cmd
*se_cmd
;
3687 unsigned long flags
;
3689 WARN_ON(!list_empty(&se_sess
->sess_wait_list
));
3690 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
3692 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3693 se_sess
->sess_tearing_down
= 1;
3695 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
3697 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
3698 se_cmd
->cmd_wait_set
= 1;
3700 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3702 EXPORT_SYMBOL(target_splice_sess_cmd_list
);
3704 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
3705 * @se_sess: session to wait for active I/O
3706 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3708 void target_wait_for_sess_cmds(
3709 struct se_session
*se_sess
,
3712 struct se_cmd
*se_cmd
, *tmp_cmd
;
3715 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
3716 &se_sess
->sess_wait_list
, se_cmd_list
) {
3717 list_del(&se_cmd
->se_cmd_list
);
3719 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3720 " %d\n", se_cmd
, se_cmd
->t_state
,
3721 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3723 if (wait_for_tasks
) {
3724 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3725 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
3726 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3728 rc
= transport_wait_for_tasks(se_cmd
);
3730 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3731 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
3732 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3736 wait_for_completion(&se_cmd
->cmd_wait_comp
);
3737 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3738 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
3739 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3742 se_cmd
->se_tfo
->release_cmd(se_cmd
);
3745 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
3747 /* transport_lun_wait_for_tasks():
3749 * Called from ConfigFS context to stop the passed struct se_cmd to allow
3750 * an struct se_lun to be successfully shutdown.
3752 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
3754 unsigned long flags
;
3758 * If the frontend has already requested this struct se_cmd to
3759 * be stopped, we can safely ignore this struct se_cmd.
3761 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3762 if (cmd
->transport_state
& CMD_T_STOP
) {
3763 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
3765 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3766 cmd
->se_tfo
->get_task_tag(cmd
));
3767 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3768 transport_cmd_check_stop(cmd
, 1, 0);
3771 cmd
->transport_state
|= CMD_T_LUN_FE_STOP
;
3772 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3774 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
3776 // XXX: audit task_flags checks.
3777 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3778 if ((cmd
->transport_state
& CMD_T_BUSY
) &&
3779 (cmd
->transport_state
& CMD_T_SENT
)) {
3780 if (!target_stop_cmd(cmd
, &flags
))
3782 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3784 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3786 target_remove_from_execute_list(cmd
);
3789 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3792 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
3793 cmd
->se_tfo
->get_task_tag(cmd
));
3794 wait_for_completion(&cmd
->transport_lun_stop_comp
);
3795 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
3796 cmd
->se_tfo
->get_task_tag(cmd
));
3798 transport_remove_cmd_from_queue(cmd
);
3803 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
3805 struct se_cmd
*cmd
= NULL
;
3806 unsigned long lun_flags
, cmd_flags
;
3808 * Do exception processing and return CHECK_CONDITION status to the
3811 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3812 while (!list_empty(&lun
->lun_cmd_list
)) {
3813 cmd
= list_first_entry(&lun
->lun_cmd_list
,
3814 struct se_cmd
, se_lun_node
);
3815 list_del_init(&cmd
->se_lun_node
);
3818 * This will notify iscsi_target_transport.c:
3819 * transport_cmd_check_stop() that a LUN shutdown is in
3820 * progress for the iscsi_cmd_t.
3822 spin_lock(&cmd
->t_state_lock
);
3823 pr_debug("SE_LUN[%d] - Setting cmd->transport"
3824 "_lun_stop for ITT: 0x%08x\n",
3825 cmd
->se_lun
->unpacked_lun
,
3826 cmd
->se_tfo
->get_task_tag(cmd
));
3827 cmd
->transport_state
|= CMD_T_LUN_STOP
;
3828 spin_unlock(&cmd
->t_state_lock
);
3830 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
3833 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
3834 cmd
->se_tfo
->get_task_tag(cmd
),
3835 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
3839 * If the Storage engine still owns the iscsi_cmd_t, determine
3840 * and/or stop its context.
3842 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
3843 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
3844 cmd
->se_tfo
->get_task_tag(cmd
));
3846 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
3847 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3851 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
3852 "_wait_for_tasks(): SUCCESS\n",
3853 cmd
->se_lun
->unpacked_lun
,
3854 cmd
->se_tfo
->get_task_tag(cmd
));
3856 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
3857 if (!(cmd
->transport_state
& CMD_T_DEV_ACTIVE
)) {
3858 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
3861 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
3862 target_remove_from_state_list(cmd
);
3863 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
3866 * The Storage engine stopped this struct se_cmd before it was
3867 * send to the fabric frontend for delivery back to the
3868 * Initiator Node. Return this SCSI CDB back with an
3869 * CHECK_CONDITION status.
3872 transport_send_check_condition_and_sense(cmd
,
3873 TCM_NON_EXISTENT_LUN
, 0);
3875 * If the fabric frontend is waiting for this iscsi_cmd_t to
3876 * be released, notify the waiting thread now that LU has
3877 * finished accessing it.
3879 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
3880 if (cmd
->transport_state
& CMD_T_LUN_FE_STOP
) {
3881 pr_debug("SE_LUN[%d] - Detected FE stop for"
3882 " struct se_cmd: %p ITT: 0x%08x\n",
3884 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
3886 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3888 transport_cmd_check_stop(cmd
, 1, 0);
3889 complete(&cmd
->transport_lun_fe_stop_comp
);
3890 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3893 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
3894 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
3896 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
3897 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3899 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
3902 static int transport_clear_lun_thread(void *p
)
3904 struct se_lun
*lun
= p
;
3906 __transport_clear_lun_from_sessions(lun
);
3907 complete(&lun
->lun_shutdown_comp
);
3912 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
3914 struct task_struct
*kt
;
3916 kt
= kthread_run(transport_clear_lun_thread
, lun
,
3917 "tcm_cl_%u", lun
->unpacked_lun
);
3919 pr_err("Unable to start clear_lun thread\n");
3922 wait_for_completion(&lun
->lun_shutdown_comp
);
3928 * transport_wait_for_tasks - wait for completion to occur
3929 * @cmd: command to wait
3931 * Called from frontend fabric context to wait for storage engine
3932 * to pause and/or release frontend generated struct se_cmd.
3934 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
3936 unsigned long flags
;
3938 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3939 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
3940 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
3941 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3945 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3946 * has been set in transport_set_supported_SAM_opcode().
3948 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
3949 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
3950 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3954 * If we are already stopped due to an external event (ie: LUN shutdown)
3955 * sleep until the connection can have the passed struct se_cmd back.
3956 * The cmd->transport_lun_stopped_sem will be upped by
3957 * transport_clear_lun_from_sessions() once the ConfigFS context caller
3958 * has completed its operation on the struct se_cmd.
3960 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
3961 pr_debug("wait_for_tasks: Stopping"
3962 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
3963 "_stop_comp); for ITT: 0x%08x\n",
3964 cmd
->se_tfo
->get_task_tag(cmd
));
3966 * There is a special case for WRITES where a FE exception +
3967 * LUN shutdown means ConfigFS context is still sleeping on
3968 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3969 * We go ahead and up transport_lun_stop_comp just to be sure
3972 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3973 complete(&cmd
->transport_lun_stop_comp
);
3974 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
3975 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3977 target_remove_from_state_list(cmd
);
3979 * At this point, the frontend who was the originator of this
3980 * struct se_cmd, now owns the structure and can be released through
3981 * normal means below.
3983 pr_debug("wait_for_tasks: Stopped"
3984 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
3985 "stop_comp); for ITT: 0x%08x\n",
3986 cmd
->se_tfo
->get_task_tag(cmd
));
3988 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
3991 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
3992 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3996 cmd
->transport_state
|= CMD_T_STOP
;
3998 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
3999 " i_state: %d, t_state: %d, CMD_T_STOP\n",
4000 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4001 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4003 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4005 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4007 wait_for_completion(&cmd
->t_transport_stop_comp
);
4009 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4010 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
4012 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4013 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4014 cmd
->se_tfo
->get_task_tag(cmd
));
4016 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4020 EXPORT_SYMBOL(transport_wait_for_tasks
);
4022 static int transport_get_sense_codes(
4027 *asc
= cmd
->scsi_asc
;
4028 *ascq
= cmd
->scsi_ascq
;
4033 static int transport_set_sense_codes(
4038 cmd
->scsi_asc
= asc
;
4039 cmd
->scsi_ascq
= ascq
;
4044 int transport_send_check_condition_and_sense(
4049 unsigned char *buffer
= cmd
->sense_buffer
;
4050 unsigned long flags
;
4052 u8 asc
= 0, ascq
= 0;
4054 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4055 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4056 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4059 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4060 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4062 if (!reason
&& from_transport
)
4065 if (!from_transport
)
4066 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4068 * Data Segment and SenseLength of the fabric response PDU.
4070 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4071 * from include/scsi/scsi_cmnd.h
4073 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4074 TRANSPORT_SENSE_BUFFER
);
4076 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4077 * SENSE KEY values from include/scsi/scsi.h
4080 case TCM_NON_EXISTENT_LUN
:
4082 buffer
[offset
] = 0x70;
4083 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4084 /* ILLEGAL REQUEST */
4085 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4086 /* LOGICAL UNIT NOT SUPPORTED */
4087 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4089 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4090 case TCM_SECTOR_COUNT_TOO_MANY
:
4092 buffer
[offset
] = 0x70;
4093 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4094 /* ILLEGAL REQUEST */
4095 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4096 /* INVALID COMMAND OPERATION CODE */
4097 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4099 case TCM_UNKNOWN_MODE_PAGE
:
4101 buffer
[offset
] = 0x70;
4102 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4103 /* ILLEGAL REQUEST */
4104 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4105 /* INVALID FIELD IN CDB */
4106 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4108 case TCM_CHECK_CONDITION_ABORT_CMD
:
4110 buffer
[offset
] = 0x70;
4111 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4112 /* ABORTED COMMAND */
4113 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4114 /* BUS DEVICE RESET FUNCTION OCCURRED */
4115 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4116 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4118 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4120 buffer
[offset
] = 0x70;
4121 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4122 /* ABORTED COMMAND */
4123 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4125 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4126 /* NOT ENOUGH UNSOLICITED DATA */
4127 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4129 case TCM_INVALID_CDB_FIELD
:
4131 buffer
[offset
] = 0x70;
4132 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4133 /* ILLEGAL REQUEST */
4134 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4135 /* INVALID FIELD IN CDB */
4136 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4138 case TCM_INVALID_PARAMETER_LIST
:
4140 buffer
[offset
] = 0x70;
4141 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4142 /* ILLEGAL REQUEST */
4143 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4144 /* INVALID FIELD IN PARAMETER LIST */
4145 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4147 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4149 buffer
[offset
] = 0x70;
4150 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4151 /* ABORTED COMMAND */
4152 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4154 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4155 /* UNEXPECTED_UNSOLICITED_DATA */
4156 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4158 case TCM_SERVICE_CRC_ERROR
:
4160 buffer
[offset
] = 0x70;
4161 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4162 /* ABORTED COMMAND */
4163 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4164 /* PROTOCOL SERVICE CRC ERROR */
4165 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4167 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4169 case TCM_SNACK_REJECTED
:
4171 buffer
[offset
] = 0x70;
4172 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4173 /* ABORTED COMMAND */
4174 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4176 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4177 /* FAILED RETRANSMISSION REQUEST */
4178 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4180 case TCM_WRITE_PROTECTED
:
4182 buffer
[offset
] = 0x70;
4183 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4185 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4186 /* WRITE PROTECTED */
4187 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4189 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4191 buffer
[offset
] = 0x70;
4192 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4193 /* UNIT ATTENTION */
4194 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4195 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4196 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4197 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4199 case TCM_CHECK_CONDITION_NOT_READY
:
4201 buffer
[offset
] = 0x70;
4202 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4204 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4205 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4206 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4207 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4209 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4212 buffer
[offset
] = 0x70;
4213 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4214 /* ILLEGAL REQUEST */
4215 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4216 /* LOGICAL UNIT COMMUNICATION FAILURE */
4217 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4221 * This code uses linux/include/scsi/scsi.h SAM status codes!
4223 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4225 * Automatically padded, this value is encoded in the fabric's
4226 * data_length response PDU containing the SCSI defined sense data.
4228 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4231 return cmd
->se_tfo
->queue_status(cmd
);
4233 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4235 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4239 if (cmd
->transport_state
& CMD_T_ABORTED
) {
4241 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4244 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4245 " status for CDB: 0x%02x ITT: 0x%08x\n",
4247 cmd
->se_tfo
->get_task_tag(cmd
));
4249 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4250 cmd
->se_tfo
->queue_status(cmd
);
4255 EXPORT_SYMBOL(transport_check_aborted_status
);
4257 void transport_send_task_abort(struct se_cmd
*cmd
)
4259 unsigned long flags
;
4261 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4262 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4263 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4266 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4269 * If there are still expected incoming fabric WRITEs, we wait
4270 * until until they have completed before sending a TASK_ABORTED
4271 * response. This response with TASK_ABORTED status will be
4272 * queued back to fabric module by transport_check_aborted_status().
4274 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4275 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4276 cmd
->transport_state
|= CMD_T_ABORTED
;
4277 smp_mb__after_atomic_inc();
4280 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4282 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4283 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4284 cmd
->se_tfo
->get_task_tag(cmd
));
4286 cmd
->se_tfo
->queue_status(cmd
);
4289 static int transport_generic_do_tmr(struct se_cmd
*cmd
)
4291 struct se_device
*dev
= cmd
->se_dev
;
4292 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4295 switch (tmr
->function
) {
4296 case TMR_ABORT_TASK
:
4297 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
4299 case TMR_ABORT_TASK_SET
:
4301 case TMR_CLEAR_TASK_SET
:
4302 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4305 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4306 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4307 TMR_FUNCTION_REJECTED
;
4309 case TMR_TARGET_WARM_RESET
:
4310 tmr
->response
= TMR_FUNCTION_REJECTED
;
4312 case TMR_TARGET_COLD_RESET
:
4313 tmr
->response
= TMR_FUNCTION_REJECTED
;
4316 pr_err("Uknown TMR function: 0x%02x.\n",
4318 tmr
->response
= TMR_FUNCTION_REJECTED
;
4322 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4323 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4325 transport_cmd_check_stop_to_fabric(cmd
);
4329 /* transport_processing_thread():
4333 static int transport_processing_thread(void *param
)
4337 struct se_device
*dev
= param
;
4339 while (!kthread_should_stop()) {
4340 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4341 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4342 kthread_should_stop());
4347 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4351 switch (cmd
->t_state
) {
4352 case TRANSPORT_NEW_CMD
:
4355 case TRANSPORT_NEW_CMD_MAP
:
4356 if (!cmd
->se_tfo
->new_cmd_map
) {
4357 pr_err("cmd->se_tfo->new_cmd_map is"
4358 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4361 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4363 transport_generic_request_failure(cmd
);
4366 ret
= transport_generic_new_cmd(cmd
);
4368 transport_generic_request_failure(cmd
);
4372 case TRANSPORT_PROCESS_WRITE
:
4373 transport_generic_process_write(cmd
);
4375 case TRANSPORT_PROCESS_TMR
:
4376 transport_generic_do_tmr(cmd
);
4378 case TRANSPORT_COMPLETE_QF_WP
:
4379 transport_write_pending_qf(cmd
);
4381 case TRANSPORT_COMPLETE_QF_OK
:
4382 transport_complete_qf(cmd
);
4385 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4386 "i_state: %d on SE LUN: %u\n",
4388 cmd
->se_tfo
->get_task_tag(cmd
),
4389 cmd
->se_tfo
->get_cmd_state(cmd
),
4390 cmd
->se_lun
->unpacked_lun
);
4398 WARN_ON(!list_empty(&dev
->state_list
));
4399 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4400 dev
->process_thread
= NULL
;