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 void target_release_session(struct kref
*kref
)
320 struct se_session
*se_sess
= container_of(kref
,
321 struct se_session
, sess_kref
);
322 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
324 se_tpg
->se_tpg_tfo
->close_session(se_sess
);
327 void target_get_session(struct se_session
*se_sess
)
329 kref_get(&se_sess
->sess_kref
);
331 EXPORT_SYMBOL(target_get_session
);
333 void target_put_session(struct se_session
*se_sess
)
335 struct se_portal_group
*tpg
= se_sess
->se_tpg
;
337 if (tpg
->se_tpg_tfo
->put_session
!= NULL
) {
338 tpg
->se_tpg_tfo
->put_session(se_sess
);
341 kref_put(&se_sess
->sess_kref
, target_release_session
);
343 EXPORT_SYMBOL(target_put_session
);
345 static void target_complete_nacl(struct kref
*kref
)
347 struct se_node_acl
*nacl
= container_of(kref
,
348 struct se_node_acl
, acl_kref
);
350 complete(&nacl
->acl_free_comp
);
353 void target_put_nacl(struct se_node_acl
*nacl
)
355 kref_put(&nacl
->acl_kref
, target_complete_nacl
);
358 void transport_deregister_session_configfs(struct se_session
*se_sess
)
360 struct se_node_acl
*se_nacl
;
363 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
365 se_nacl
= se_sess
->se_node_acl
;
367 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
368 if (se_nacl
->acl_stop
== 0)
369 list_del(&se_sess
->sess_acl_list
);
371 * If the session list is empty, then clear the pointer.
372 * Otherwise, set the struct se_session pointer from the tail
373 * element of the per struct se_node_acl active session list.
375 if (list_empty(&se_nacl
->acl_sess_list
))
376 se_nacl
->nacl_sess
= NULL
;
378 se_nacl
->nacl_sess
= container_of(
379 se_nacl
->acl_sess_list
.prev
,
380 struct se_session
, sess_acl_list
);
382 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
385 EXPORT_SYMBOL(transport_deregister_session_configfs
);
387 void transport_free_session(struct se_session
*se_sess
)
389 kmem_cache_free(se_sess_cache
, se_sess
);
391 EXPORT_SYMBOL(transport_free_session
);
393 void transport_deregister_session(struct se_session
*se_sess
)
395 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
396 struct target_core_fabric_ops
*se_tfo
;
397 struct se_node_acl
*se_nacl
;
399 bool comp_nacl
= true;
402 transport_free_session(se_sess
);
405 se_tfo
= se_tpg
->se_tpg_tfo
;
407 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
408 list_del(&se_sess
->sess_list
);
409 se_sess
->se_tpg
= NULL
;
410 se_sess
->fabric_sess_ptr
= NULL
;
411 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
414 * Determine if we need to do extra work for this initiator node's
415 * struct se_node_acl if it had been previously dynamically generated.
417 se_nacl
= se_sess
->se_node_acl
;
419 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
420 if (se_nacl
&& se_nacl
->dynamic_node_acl
) {
421 if (!se_tfo
->tpg_check_demo_mode_cache(se_tpg
)) {
422 list_del(&se_nacl
->acl_list
);
423 se_tpg
->num_node_acls
--;
424 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
425 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
426 core_free_device_list_for_node(se_nacl
, se_tpg
);
427 se_tfo
->tpg_release_fabric_acl(se_tpg
, se_nacl
);
430 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
433 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
435 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
436 se_tpg
->se_tpg_tfo
->get_fabric_name());
438 * If last kref is dropping now for an explict NodeACL, awake sleeping
439 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
442 if (se_nacl
&& comp_nacl
== true)
443 target_put_nacl(se_nacl
);
445 transport_free_session(se_sess
);
447 EXPORT_SYMBOL(transport_deregister_session
);
450 * Called with cmd->t_state_lock held.
452 static void target_remove_from_state_list(struct se_cmd
*cmd
)
454 struct se_device
*dev
= cmd
->se_dev
;
460 if (cmd
->transport_state
& CMD_T_BUSY
)
463 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
464 if (cmd
->state_active
) {
465 list_del(&cmd
->state_list
);
466 cmd
->state_active
= false;
468 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
471 /* transport_cmd_check_stop():
473 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
474 * 'transport_off = 2' determines if task_dev_state should be removed.
476 * A non-zero u8 t_state sets cmd->t_state.
477 * Returns 1 when command is stopped, else 0.
479 static int transport_cmd_check_stop(
486 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
488 * Determine if IOCTL context caller in requesting the stopping of this
489 * command for LUN shutdown purposes.
491 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
492 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
493 __func__
, __LINE__
, cmd
->se_tfo
->get_task_tag(cmd
));
495 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
496 if (transport_off
== 2)
497 target_remove_from_state_list(cmd
);
498 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
500 complete(&cmd
->transport_lun_stop_comp
);
504 * Determine if frontend context caller is requesting the stopping of
505 * this command for frontend exceptions.
507 if (cmd
->transport_state
& CMD_T_STOP
) {
508 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
510 cmd
->se_tfo
->get_task_tag(cmd
));
512 if (transport_off
== 2)
513 target_remove_from_state_list(cmd
);
516 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
519 if (transport_off
== 2)
521 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
523 complete(&cmd
->t_transport_stop_comp
);
527 cmd
->transport_state
&= ~CMD_T_ACTIVE
;
528 if (transport_off
== 2) {
529 target_remove_from_state_list(cmd
);
531 * Clear struct se_cmd->se_lun before the transport_off == 2
532 * handoff to fabric module.
536 * Some fabric modules like tcm_loop can release
537 * their internally allocated I/O reference now and
540 * Fabric modules are expected to return '1' here if the
541 * se_cmd being passed is released at this point,
542 * or zero if not being released.
544 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
545 spin_unlock_irqrestore(
546 &cmd
->t_state_lock
, flags
);
548 return cmd
->se_tfo
->check_stop_free(cmd
);
551 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
555 cmd
->t_state
= t_state
;
556 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
561 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
563 return transport_cmd_check_stop(cmd
, 2, 0);
566 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
568 struct se_lun
*lun
= cmd
->se_lun
;
574 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
575 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
576 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
577 target_remove_from_state_list(cmd
);
579 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
581 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
582 if (!list_empty(&cmd
->se_lun_node
))
583 list_del_init(&cmd
->se_lun_node
);
584 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
587 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
589 if (!(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
590 transport_lun_remove_cmd(cmd
);
592 if (transport_cmd_check_stop_to_fabric(cmd
))
595 transport_remove_cmd_from_queue(cmd
);
596 transport_put_cmd(cmd
);
600 static void transport_add_cmd_to_queue(struct se_cmd
*cmd
, int t_state
,
603 struct se_device
*dev
= cmd
->se_dev
;
604 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
608 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
609 cmd
->t_state
= t_state
;
610 cmd
->transport_state
|= CMD_T_ACTIVE
;
611 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
614 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
616 /* If the cmd is already on the list, remove it before we add it */
617 if (!list_empty(&cmd
->se_queue_node
))
618 list_del(&cmd
->se_queue_node
);
620 atomic_inc(&qobj
->queue_cnt
);
623 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
625 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
626 cmd
->transport_state
|= CMD_T_QUEUED
;
627 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
629 wake_up_interruptible(&qobj
->thread_wq
);
632 static struct se_cmd
*
633 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
638 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
639 if (list_empty(&qobj
->qobj_list
)) {
640 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
643 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
645 cmd
->transport_state
&= ~CMD_T_QUEUED
;
646 list_del_init(&cmd
->se_queue_node
);
647 atomic_dec(&qobj
->queue_cnt
);
648 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
653 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
)
655 struct se_queue_obj
*qobj
= &cmd
->se_dev
->dev_queue_obj
;
658 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
659 if (!(cmd
->transport_state
& CMD_T_QUEUED
)) {
660 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
663 cmd
->transport_state
&= ~CMD_T_QUEUED
;
664 atomic_dec(&qobj
->queue_cnt
);
665 list_del_init(&cmd
->se_queue_node
);
666 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
669 static void target_complete_failure_work(struct work_struct
*work
)
671 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
673 transport_generic_request_failure(cmd
);
676 void target_complete_cmd(struct se_cmd
*cmd
, u8 scsi_status
)
678 struct se_device
*dev
= cmd
->se_dev
;
679 int success
= scsi_status
== GOOD
;
682 cmd
->scsi_status
= scsi_status
;
685 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
686 cmd
->transport_state
&= ~CMD_T_BUSY
;
688 if (dev
&& dev
->transport
->transport_complete
) {
689 if (dev
->transport
->transport_complete(cmd
,
690 cmd
->t_data_sg
) != 0) {
691 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
697 * See if we are waiting to complete for an exception condition.
699 if (cmd
->transport_state
& CMD_T_REQUEST_STOP
) {
700 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
701 complete(&cmd
->task_stop_comp
);
706 cmd
->transport_state
|= CMD_T_FAILED
;
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 HwMaxSectors: %u\n",
880 dev
->se_sub_dev
->se_dev_attrib
.block_size
,
881 dev
->se_sub_dev
->se_dev_attrib
.hw_max_sectors
);
882 *bl
+= sprintf(b
+ *bl
, " ");
885 void transport_dump_vpd_proto_id(
887 unsigned char *p_buf
,
890 unsigned char buf
[VPD_TMP_BUF_SIZE
];
893 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
894 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
896 switch (vpd
->protocol_identifier
) {
898 sprintf(buf
+len
, "Fibre Channel\n");
901 sprintf(buf
+len
, "Parallel SCSI\n");
904 sprintf(buf
+len
, "SSA\n");
907 sprintf(buf
+len
, "IEEE 1394\n");
910 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
914 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
917 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
920 sprintf(buf
+len
, "Automation/Drive Interface Transport"
924 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
927 sprintf(buf
+len
, "Unknown 0x%02x\n",
928 vpd
->protocol_identifier
);
933 strncpy(p_buf
, buf
, p_buf_len
);
939 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
942 * Check if the Protocol Identifier Valid (PIV) bit is set..
944 * from spc3r23.pdf section 7.5.1
946 if (page_83
[1] & 0x80) {
947 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
948 vpd
->protocol_identifier_set
= 1;
949 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
952 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
954 int transport_dump_vpd_assoc(
956 unsigned char *p_buf
,
959 unsigned char buf
[VPD_TMP_BUF_SIZE
];
963 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
964 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
966 switch (vpd
->association
) {
968 sprintf(buf
+len
, "addressed logical unit\n");
971 sprintf(buf
+len
, "target port\n");
974 sprintf(buf
+len
, "SCSI target device\n");
977 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
983 strncpy(p_buf
, buf
, p_buf_len
);
990 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
993 * The VPD identification association..
995 * from spc3r23.pdf Section 7.6.3.1 Table 297
997 vpd
->association
= (page_83
[1] & 0x30);
998 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1000 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1002 int transport_dump_vpd_ident_type(
1003 struct t10_vpd
*vpd
,
1004 unsigned char *p_buf
,
1007 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1011 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1012 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1014 switch (vpd
->device_identifier_type
) {
1016 sprintf(buf
+len
, "Vendor specific\n");
1019 sprintf(buf
+len
, "T10 Vendor ID based\n");
1022 sprintf(buf
+len
, "EUI-64 based\n");
1025 sprintf(buf
+len
, "NAA\n");
1028 sprintf(buf
+len
, "Relative target port identifier\n");
1031 sprintf(buf
+len
, "SCSI name string\n");
1034 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1035 vpd
->device_identifier_type
);
1041 if (p_buf_len
< strlen(buf
)+1)
1043 strncpy(p_buf
, buf
, p_buf_len
);
1045 pr_debug("%s", buf
);
1051 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1054 * The VPD identifier type..
1056 * from spc3r23.pdf Section 7.6.3.1 Table 298
1058 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1059 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1061 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1063 int transport_dump_vpd_ident(
1064 struct t10_vpd
*vpd
,
1065 unsigned char *p_buf
,
1068 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1071 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1073 switch (vpd
->device_identifier_code_set
) {
1074 case 0x01: /* Binary */
1075 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1076 &vpd
->device_identifier
[0]);
1078 case 0x02: /* ASCII */
1079 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1080 &vpd
->device_identifier
[0]);
1082 case 0x03: /* UTF-8 */
1083 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1084 &vpd
->device_identifier
[0]);
1087 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1088 " 0x%02x", vpd
->device_identifier_code_set
);
1094 strncpy(p_buf
, buf
, p_buf_len
);
1096 pr_debug("%s", buf
);
1102 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1104 static const char hex_str
[] = "0123456789abcdef";
1105 int j
= 0, i
= 4; /* offset to start of the identifer */
1108 * The VPD Code Set (encoding)
1110 * from spc3r23.pdf Section 7.6.3.1 Table 296
1112 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1113 switch (vpd
->device_identifier_code_set
) {
1114 case 0x01: /* Binary */
1115 vpd
->device_identifier
[j
++] =
1116 hex_str
[vpd
->device_identifier_type
];
1117 while (i
< (4 + page_83
[3])) {
1118 vpd
->device_identifier
[j
++] =
1119 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1120 vpd
->device_identifier
[j
++] =
1121 hex_str
[page_83
[i
] & 0x0f];
1125 case 0x02: /* ASCII */
1126 case 0x03: /* UTF-8 */
1127 while (i
< (4 + page_83
[3]))
1128 vpd
->device_identifier
[j
++] = page_83
[i
++];
1134 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1136 EXPORT_SYMBOL(transport_set_vpd_ident
);
1138 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1141 * If this device is from Target_Core_Mod/pSCSI, disable the
1142 * SAM Task Attribute emulation.
1144 * This is currently not available in upsream Linux/SCSI Target
1145 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1147 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1148 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1152 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1153 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1154 " device\n", dev
->transport
->name
,
1155 dev
->transport
->get_device_rev(dev
));
1158 static void scsi_dump_inquiry(struct se_device
*dev
)
1160 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1164 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1166 for (i
= 0; i
< 8; i
++)
1167 if (wwn
->vendor
[i
] >= 0x20)
1168 buf
[i
] = wwn
->vendor
[i
];
1172 pr_debug(" Vendor: %s\n", buf
);
1174 for (i
= 0; i
< 16; i
++)
1175 if (wwn
->model
[i
] >= 0x20)
1176 buf
[i
] = wwn
->model
[i
];
1180 pr_debug(" Model: %s\n", buf
);
1182 for (i
= 0; i
< 4; i
++)
1183 if (wwn
->revision
[i
] >= 0x20)
1184 buf
[i
] = wwn
->revision
[i
];
1188 pr_debug(" Revision: %s\n", buf
);
1190 device_type
= dev
->transport
->get_device_type(dev
);
1191 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1192 pr_debug(" ANSI SCSI revision: %02x\n",
1193 dev
->transport
->get_device_rev(dev
));
1196 struct se_device
*transport_add_device_to_core_hba(
1198 struct se_subsystem_api
*transport
,
1199 struct se_subsystem_dev
*se_dev
,
1201 void *transport_dev
,
1202 struct se_dev_limits
*dev_limits
,
1203 const char *inquiry_prod
,
1204 const char *inquiry_rev
)
1207 struct se_device
*dev
;
1209 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1211 pr_err("Unable to allocate memory for se_dev_t\n");
1215 transport_init_queue_obj(&dev
->dev_queue_obj
);
1216 dev
->dev_flags
= device_flags
;
1217 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1218 dev
->dev_ptr
= transport_dev
;
1220 dev
->se_sub_dev
= se_dev
;
1221 dev
->transport
= transport
;
1222 INIT_LIST_HEAD(&dev
->dev_list
);
1223 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1224 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1225 INIT_LIST_HEAD(&dev
->execute_list
);
1226 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1227 INIT_LIST_HEAD(&dev
->state_list
);
1228 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1229 spin_lock_init(&dev
->execute_task_lock
);
1230 spin_lock_init(&dev
->delayed_cmd_lock
);
1231 spin_lock_init(&dev
->dev_reservation_lock
);
1232 spin_lock_init(&dev
->dev_status_lock
);
1233 spin_lock_init(&dev
->se_port_lock
);
1234 spin_lock_init(&dev
->se_tmr_lock
);
1235 spin_lock_init(&dev
->qf_cmd_lock
);
1236 atomic_set(&dev
->dev_ordered_id
, 0);
1238 se_dev_set_default_attribs(dev
, dev_limits
);
1240 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1241 dev
->creation_time
= get_jiffies_64();
1242 spin_lock_init(&dev
->stats_lock
);
1244 spin_lock(&hba
->device_lock
);
1245 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1247 spin_unlock(&hba
->device_lock
);
1249 * Setup the SAM Task Attribute emulation for struct se_device
1251 core_setup_task_attr_emulation(dev
);
1253 * Force PR and ALUA passthrough emulation with internal object use.
1255 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1257 * Setup the Reservations infrastructure for struct se_device
1259 core_setup_reservations(dev
, force_pt
);
1261 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1263 if (core_setup_alua(dev
, force_pt
) < 0)
1267 * Startup the struct se_device processing thread
1269 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1270 "LIO_%s", dev
->transport
->name
);
1271 if (IS_ERR(dev
->process_thread
)) {
1272 pr_err("Unable to create kthread: LIO_%s\n",
1273 dev
->transport
->name
);
1277 * Setup work_queue for QUEUE_FULL
1279 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1281 * Preload the initial INQUIRY const values if we are doing
1282 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1283 * passthrough because this is being provided by the backend LLD.
1284 * This is required so that transport_get_inquiry() copies these
1285 * originals once back into DEV_T10_WWN(dev) for the virtual device
1288 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1289 if (!inquiry_prod
|| !inquiry_rev
) {
1290 pr_err("All non TCM/pSCSI plugins require"
1291 " INQUIRY consts\n");
1295 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1296 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1297 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1299 scsi_dump_inquiry(dev
);
1303 kthread_stop(dev
->process_thread
);
1305 spin_lock(&hba
->device_lock
);
1306 list_del(&dev
->dev_list
);
1308 spin_unlock(&hba
->device_lock
);
1310 se_release_vpd_for_dev(dev
);
1316 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1318 /* transport_generic_prepare_cdb():
1320 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1321 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1322 * The point of this is since we are mapping iSCSI LUNs to
1323 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1324 * devices and HBAs for a loop.
1326 static inline void transport_generic_prepare_cdb(
1330 case READ_10
: /* SBC - RDProtect */
1331 case READ_12
: /* SBC - RDProtect */
1332 case READ_16
: /* SBC - RDProtect */
1333 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1334 case VERIFY
: /* SBC - VRProtect */
1335 case VERIFY_16
: /* SBC - VRProtect */
1336 case WRITE_VERIFY
: /* SBC - VRProtect */
1337 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1338 case MAINTENANCE_IN
: /* SPC - Parameter Data Format for SA RTPG */
1341 cdb
[1] &= 0x1f; /* clear logical unit number */
1346 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1349 * Used by fabric modules containing a local struct se_cmd within their
1350 * fabric dependent per I/O descriptor.
1352 void transport_init_se_cmd(
1354 struct target_core_fabric_ops
*tfo
,
1355 struct se_session
*se_sess
,
1359 unsigned char *sense_buffer
)
1361 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1362 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1363 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1364 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1365 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1366 INIT_LIST_HEAD(&cmd
->execute_list
);
1367 INIT_LIST_HEAD(&cmd
->state_list
);
1368 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1369 init_completion(&cmd
->transport_lun_stop_comp
);
1370 init_completion(&cmd
->t_transport_stop_comp
);
1371 init_completion(&cmd
->cmd_wait_comp
);
1372 init_completion(&cmd
->task_stop_comp
);
1373 spin_lock_init(&cmd
->t_state_lock
);
1374 cmd
->transport_state
= CMD_T_DEV_ACTIVE
;
1377 cmd
->se_sess
= se_sess
;
1378 cmd
->data_length
= data_length
;
1379 cmd
->data_direction
= data_direction
;
1380 cmd
->sam_task_attr
= task_attr
;
1381 cmd
->sense_buffer
= sense_buffer
;
1383 cmd
->state_active
= false;
1385 EXPORT_SYMBOL(transport_init_se_cmd
);
1387 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1390 * Check if SAM Task Attribute emulation is enabled for this
1391 * struct se_device storage object
1393 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1396 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1397 pr_debug("SAM Task Attribute ACA"
1398 " emulation is not supported\n");
1402 * Used to determine when ORDERED commands should go from
1403 * Dormant to Active status.
1405 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1406 smp_mb__after_atomic_inc();
1407 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1408 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1409 cmd
->se_dev
->transport
->name
);
1413 /* target_setup_cmd_from_cdb():
1415 * Called from fabric RX Thread.
1417 int target_setup_cmd_from_cdb(
1423 transport_generic_prepare_cdb(cdb
);
1425 * Ensure that the received CDB is less than the max (252 + 8) bytes
1426 * for VARIABLE_LENGTH_CMD
1428 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1429 pr_err("Received SCSI CDB with command_size: %d that"
1430 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1431 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1432 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1433 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1437 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1438 * allocate the additional extended CDB buffer now.. Otherwise
1439 * setup the pointer from __t_task_cdb to t_task_cdb.
1441 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1442 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1444 if (!cmd
->t_task_cdb
) {
1445 pr_err("Unable to allocate cmd->t_task_cdb"
1446 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1447 scsi_command_size(cdb
),
1448 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1449 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1450 cmd
->scsi_sense_reason
=
1451 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1455 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1457 * Copy the original CDB into cmd->
1459 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1461 * Setup the received CDB based on SCSI defined opcodes and
1462 * perform unit attention, persistent reservations and ALUA
1463 * checks for virtual device backends. The cmd->t_task_cdb
1464 * pointer is expected to be setup before we reach this point.
1466 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1470 * Check for SAM Task Attribute Emulation
1472 if (transport_check_alloc_task_attr(cmd
) < 0) {
1473 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1474 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1477 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1478 if (cmd
->se_lun
->lun_sep
)
1479 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1480 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1483 EXPORT_SYMBOL(target_setup_cmd_from_cdb
);
1486 * Used by fabric module frontends to queue tasks directly.
1487 * Many only be used from process context only
1489 int transport_handle_cdb_direct(
1496 pr_err("cmd->se_lun is NULL\n");
1499 if (in_interrupt()) {
1501 pr_err("transport_generic_handle_cdb cannot be called"
1502 " from interrupt context\n");
1506 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1507 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1508 * in existing usage to ensure that outstanding descriptors are handled
1509 * correctly during shutdown via transport_wait_for_tasks()
1511 * Also, we don't take cmd->t_state_lock here as we only expect
1512 * this to be called for initial descriptor submission.
1514 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1515 cmd
->transport_state
|= CMD_T_ACTIVE
;
1518 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1519 * so follow TRANSPORT_NEW_CMD processing thread context usage
1520 * and call transport_generic_request_failure() if necessary..
1522 ret
= transport_generic_new_cmd(cmd
);
1524 transport_generic_request_failure(cmd
);
1528 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1531 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1533 * @se_cmd: command descriptor to submit
1534 * @se_sess: associated se_sess for endpoint
1535 * @cdb: pointer to SCSI CDB
1536 * @sense: pointer to SCSI sense buffer
1537 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1538 * @data_length: fabric expected data transfer length
1539 * @task_addr: SAM task attribute
1540 * @data_dir: DMA data direction
1541 * @flags: flags for command submission from target_sc_flags_tables
1543 * This may only be called from process context, and also currently
1544 * assumes internal allocation of fabric payload buffer by target-core.
1546 void target_submit_cmd(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1547 unsigned char *cdb
, unsigned char *sense
, u32 unpacked_lun
,
1548 u32 data_length
, int task_attr
, int data_dir
, int flags
)
1550 struct se_portal_group
*se_tpg
;
1553 se_tpg
= se_sess
->se_tpg
;
1555 BUG_ON(se_cmd
->se_tfo
|| se_cmd
->se_sess
);
1556 BUG_ON(in_interrupt());
1558 * Initialize se_cmd for target operation. From this point
1559 * exceptions are handled by sending exception status via
1560 * target_core_fabric_ops->queue_status() callback
1562 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1563 data_length
, data_dir
, task_attr
, sense
);
1564 if (flags
& TARGET_SCF_UNKNOWN_SIZE
)
1565 se_cmd
->unknown_data_length
= 1;
1567 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1568 * se_sess->sess_cmd_list. A second kref_get here is necessary
1569 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1570 * kref_put() to happen during fabric packet acknowledgement.
1572 target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1574 * Signal bidirectional data payloads to target-core
1576 if (flags
& TARGET_SCF_BIDI_OP
)
1577 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
1579 * Locate se_lun pointer and attach it to struct se_cmd
1581 if (transport_lookup_cmd_lun(se_cmd
, unpacked_lun
) < 0) {
1582 transport_send_check_condition_and_sense(se_cmd
,
1583 se_cmd
->scsi_sense_reason
, 0);
1584 target_put_sess_cmd(se_sess
, se_cmd
);
1588 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1589 * allocate the necessary tasks to complete the received CDB+data
1591 rc
= target_setup_cmd_from_cdb(se_cmd
, cdb
);
1593 transport_generic_request_failure(se_cmd
);
1598 * Check if we need to delay processing because of ALUA
1599 * Active/NonOptimized primary access state..
1601 core_alua_check_nonop_delay(se_cmd
);
1604 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1605 * for immediate execution of READs, otherwise wait for
1606 * transport_generic_handle_data() to be called for WRITEs
1607 * when fabric has filled the incoming buffer.
1609 transport_handle_cdb_direct(se_cmd
);
1612 EXPORT_SYMBOL(target_submit_cmd
);
1614 static void target_complete_tmr_failure(struct work_struct
*work
)
1616 struct se_cmd
*se_cmd
= container_of(work
, struct se_cmd
, work
);
1618 se_cmd
->se_tmr_req
->response
= TMR_LUN_DOES_NOT_EXIST
;
1619 se_cmd
->se_tfo
->queue_tm_rsp(se_cmd
);
1620 transport_generic_free_cmd(se_cmd
, 0);
1624 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1627 * @se_cmd: command descriptor to submit
1628 * @se_sess: associated se_sess for endpoint
1629 * @sense: pointer to SCSI sense buffer
1630 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1631 * @fabric_context: fabric context for TMR req
1632 * @tm_type: Type of TM request
1633 * @gfp: gfp type for caller
1634 * @tag: referenced task tag for TMR_ABORT_TASK
1635 * @flags: submit cmd flags
1637 * Callable from all contexts.
1640 int target_submit_tmr(struct se_cmd
*se_cmd
, struct se_session
*se_sess
,
1641 unsigned char *sense
, u32 unpacked_lun
,
1642 void *fabric_tmr_ptr
, unsigned char tm_type
,
1643 gfp_t gfp
, unsigned int tag
, int flags
)
1645 struct se_portal_group
*se_tpg
;
1648 se_tpg
= se_sess
->se_tpg
;
1651 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
,
1652 0, DMA_NONE
, MSG_SIMPLE_TAG
, sense
);
1654 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1655 * allocation failure.
1657 ret
= core_tmr_alloc_req(se_cmd
, fabric_tmr_ptr
, tm_type
, gfp
);
1661 if (tm_type
== TMR_ABORT_TASK
)
1662 se_cmd
->se_tmr_req
->ref_task_tag
= tag
;
1664 /* See target_submit_cmd for commentary */
1665 target_get_sess_cmd(se_sess
, se_cmd
, (flags
& TARGET_SCF_ACK_KREF
));
1667 ret
= transport_lookup_tmr_lun(se_cmd
, unpacked_lun
);
1670 * For callback during failure handling, push this work off
1671 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1673 INIT_WORK(&se_cmd
->work
, target_complete_tmr_failure
);
1674 schedule_work(&se_cmd
->work
);
1677 transport_generic_handle_tmr(se_cmd
);
1680 EXPORT_SYMBOL(target_submit_tmr
);
1683 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1684 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1685 * complete setup in TCM process context w/ TFO->new_cmd_map().
1687 int transport_generic_handle_cdb_map(
1692 pr_err("cmd->se_lun is NULL\n");
1696 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
, false);
1699 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1701 /* transport_generic_handle_data():
1705 int transport_generic_handle_data(
1709 * For the software fabric case, then we assume the nexus is being
1710 * failed/shutdown when signals are pending from the kthread context
1711 * caller, so we return a failure. For the HW target mode case running
1712 * in interrupt code, the signal_pending() check is skipped.
1714 if (!in_interrupt() && signal_pending(current
))
1717 * If the received CDB has aleady been ABORTED by the generic
1718 * target engine, we now call transport_check_aborted_status()
1719 * to queue any delated TASK_ABORTED status for the received CDB to the
1720 * fabric module as we are expecting no further incoming DATA OUT
1721 * sequences at this point.
1723 if (transport_check_aborted_status(cmd
, 1) != 0)
1726 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
, false);
1729 EXPORT_SYMBOL(transport_generic_handle_data
);
1731 /* transport_generic_handle_tmr():
1735 int transport_generic_handle_tmr(
1738 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
, false);
1741 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1744 * If the cmd is active, request it to be stopped and sleep until it
1747 bool target_stop_cmd(struct se_cmd
*cmd
, unsigned long *flags
)
1749 bool was_active
= false;
1751 if (cmd
->transport_state
& CMD_T_BUSY
) {
1752 cmd
->transport_state
|= CMD_T_REQUEST_STOP
;
1753 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1755 pr_debug("cmd %p waiting to complete\n", cmd
);
1756 wait_for_completion(&cmd
->task_stop_comp
);
1757 pr_debug("cmd %p stopped successfully\n", cmd
);
1759 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1760 cmd
->transport_state
&= ~CMD_T_REQUEST_STOP
;
1761 cmd
->transport_state
&= ~CMD_T_BUSY
;
1769 * Handle SAM-esque emulation for generic transport request failures.
1771 void transport_generic_request_failure(struct se_cmd
*cmd
)
1775 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1776 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1777 cmd
->t_task_cdb
[0]);
1778 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1779 cmd
->se_tfo
->get_cmd_state(cmd
),
1780 cmd
->t_state
, cmd
->scsi_sense_reason
);
1781 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1782 (cmd
->transport_state
& CMD_T_ACTIVE
) != 0,
1783 (cmd
->transport_state
& CMD_T_STOP
) != 0,
1784 (cmd
->transport_state
& CMD_T_SENT
) != 0);
1787 * For SAM Task Attribute emulation for failed struct se_cmd
1789 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1790 transport_complete_task_attr(cmd
);
1792 switch (cmd
->scsi_sense_reason
) {
1793 case TCM_NON_EXISTENT_LUN
:
1794 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1795 case TCM_INVALID_CDB_FIELD
:
1796 case TCM_INVALID_PARAMETER_LIST
:
1797 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1798 case TCM_UNKNOWN_MODE_PAGE
:
1799 case TCM_WRITE_PROTECTED
:
1800 case TCM_CHECK_CONDITION_ABORT_CMD
:
1801 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1802 case TCM_CHECK_CONDITION_NOT_READY
:
1804 case TCM_RESERVATION_CONFLICT
:
1806 * No SENSE Data payload for this case, set SCSI Status
1807 * and queue the response to $FABRIC_MOD.
1809 * Uses linux/include/scsi/scsi.h SAM status codes defs
1811 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1813 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1814 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1817 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1820 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1821 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1822 cmd
->orig_fe_lun
, 0x2C,
1823 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1825 ret
= cmd
->se_tfo
->queue_status(cmd
);
1826 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1830 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1831 cmd
->t_task_cdb
[0], cmd
->scsi_sense_reason
);
1832 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1836 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1837 * make the call to transport_send_check_condition_and_sense()
1838 * directly. Otherwise expect the fabric to make the call to
1839 * transport_send_check_condition_and_sense() after handling
1840 * possible unsoliticied write data payloads.
1842 ret
= transport_send_check_condition_and_sense(cmd
,
1843 cmd
->scsi_sense_reason
, 0);
1844 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1848 transport_lun_remove_cmd(cmd
);
1849 if (!transport_cmd_check_stop_to_fabric(cmd
))
1854 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1855 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1857 EXPORT_SYMBOL(transport_generic_request_failure
);
1859 static inline u32
transport_lba_21(unsigned char *cdb
)
1861 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
1864 static inline u32
transport_lba_32(unsigned char *cdb
)
1866 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1869 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
1871 unsigned int __v1
, __v2
;
1873 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1874 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1876 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1880 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1882 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
1884 unsigned int __v1
, __v2
;
1886 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
1887 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
1889 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1892 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
1894 unsigned long flags
;
1896 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
1897 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1898 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
1902 * Called from Fabric Module context from transport_execute_tasks()
1904 * The return of this function determins if the tasks from struct se_cmd
1905 * get added to the execution queue in transport_execute_tasks(),
1906 * or are added to the delayed or ordered lists here.
1908 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
1910 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1913 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1914 * to allow the passed struct se_cmd list of tasks to the front of the list.
1916 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1917 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1918 " 0x%02x, se_ordered_id: %u\n",
1920 cmd
->se_ordered_id
);
1922 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1923 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
1924 smp_mb__after_atomic_inc();
1926 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1927 " list, se_ordered_id: %u\n",
1929 cmd
->se_ordered_id
);
1931 * Add ORDERED command to tail of execution queue if
1932 * no other older commands exist that need to be
1935 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
1939 * For SIMPLE and UNTAGGED Task Attribute commands
1941 atomic_inc(&cmd
->se_dev
->simple_cmds
);
1942 smp_mb__after_atomic_inc();
1945 * Otherwise if one or more outstanding ORDERED task attribute exist,
1946 * add the dormant task(s) built for the passed struct se_cmd to the
1947 * execution queue and become in Active state for this struct se_device.
1949 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
1951 * Otherwise, add cmd w/ tasks to delayed cmd queue that
1952 * will be drained upon completion of HEAD_OF_QUEUE task.
1954 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
1955 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
1956 list_add_tail(&cmd
->se_delayed_node
,
1957 &cmd
->se_dev
->delayed_cmd_list
);
1958 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
1960 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1961 " delayed CMD list, se_ordered_id: %u\n",
1962 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1963 cmd
->se_ordered_id
);
1965 * Return zero to let transport_execute_tasks() know
1966 * not to add the delayed tasks to the execution list.
1971 * Otherwise, no ORDERED task attributes exist..
1977 * Called from fabric module context in transport_generic_new_cmd() and
1978 * transport_generic_process_write()
1980 static void transport_execute_tasks(struct se_cmd
*cmd
)
1983 struct se_device
*se_dev
= cmd
->se_dev
;
1985 * Call transport_cmd_check_stop() to see if a fabric exception
1986 * has occurred that prevents execution.
1988 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
1990 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
1991 * attribute for the tasks of the received struct se_cmd CDB
1993 add_tasks
= transport_execute_task_attr(cmd
);
1995 __transport_execute_tasks(se_dev
, cmd
);
1999 __transport_execute_tasks(se_dev
, NULL
);
2002 static int __transport_execute_tasks(struct se_device
*dev
, struct se_cmd
*new_cmd
)
2005 struct se_cmd
*cmd
= NULL
;
2006 unsigned long flags
;
2009 spin_lock_irq(&dev
->execute_task_lock
);
2010 if (new_cmd
!= NULL
)
2011 __target_add_to_execute_list(new_cmd
);
2013 if (list_empty(&dev
->execute_list
)) {
2014 spin_unlock_irq(&dev
->execute_task_lock
);
2017 cmd
= list_first_entry(&dev
->execute_list
, struct se_cmd
, execute_list
);
2018 __target_remove_from_execute_list(cmd
);
2019 spin_unlock_irq(&dev
->execute_task_lock
);
2021 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2022 cmd
->transport_state
|= CMD_T_BUSY
;
2023 cmd
->transport_state
|= CMD_T_SENT
;
2025 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2027 if (cmd
->execute_cmd
)
2028 error
= cmd
->execute_cmd(cmd
);
2030 error
= dev
->transport
->execute_cmd(cmd
, cmd
->t_data_sg
,
2031 cmd
->t_data_nents
, cmd
->data_direction
);
2035 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2036 cmd
->transport_state
&= ~CMD_T_BUSY
;
2037 cmd
->transport_state
&= ~CMD_T_SENT
;
2038 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2040 transport_generic_request_failure(cmd
);
2049 static inline u32
transport_get_sectors_6(
2054 struct se_device
*dev
= cmd
->se_dev
;
2057 * Assume TYPE_DISK for non struct se_device objects.
2058 * Use 8-bit sector value.
2064 * Use 24-bit allocation length for TYPE_TAPE.
2066 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2067 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2070 * Everything else assume TYPE_DISK Sector CDB location.
2071 * Use 8-bit sector value. SBC-3 says:
2073 * A TRANSFER LENGTH field set to zero specifies that 256
2074 * logical blocks shall be written. Any other value
2075 * specifies the number of logical blocks that shall be
2079 return cdb
[4] ? : 256;
2082 static inline u32
transport_get_sectors_10(
2087 struct se_device
*dev
= cmd
->se_dev
;
2090 * Assume TYPE_DISK for non struct se_device objects.
2091 * Use 16-bit sector value.
2097 * XXX_10 is not defined in SSC, throw an exception
2099 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2105 * Everything else assume TYPE_DISK Sector CDB location.
2106 * Use 16-bit sector value.
2109 return (u32
)(cdb
[7] << 8) + cdb
[8];
2112 static inline u32
transport_get_sectors_12(
2117 struct se_device
*dev
= cmd
->se_dev
;
2120 * Assume TYPE_DISK for non struct se_device objects.
2121 * Use 32-bit sector value.
2127 * XXX_12 is not defined in SSC, throw an exception
2129 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2135 * Everything else assume TYPE_DISK Sector CDB location.
2136 * Use 32-bit sector value.
2139 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2142 static inline u32
transport_get_sectors_16(
2147 struct se_device
*dev
= cmd
->se_dev
;
2150 * Assume TYPE_DISK for non struct se_device objects.
2151 * Use 32-bit sector value.
2157 * Use 24-bit allocation length for TYPE_TAPE.
2159 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2160 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2163 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2164 (cdb
[12] << 8) + cdb
[13];
2168 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2170 static inline u32
transport_get_sectors_32(
2176 * Assume TYPE_DISK for non struct se_device objects.
2177 * Use 32-bit sector value.
2179 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2180 (cdb
[30] << 8) + cdb
[31];
2184 static inline u32
transport_get_size(
2189 struct se_device
*dev
= cmd
->se_dev
;
2191 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2192 if (cdb
[1] & 1) { /* sectors */
2193 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2198 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2199 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
,
2200 sectors
, dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2201 dev
->transport
->name
);
2203 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2206 static void transport_xor_callback(struct se_cmd
*cmd
)
2208 unsigned char *buf
, *addr
;
2209 struct scatterlist
*sg
;
2210 unsigned int offset
;
2214 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2216 * 1) read the specified logical block(s);
2217 * 2) transfer logical blocks from the data-out buffer;
2218 * 3) XOR the logical blocks transferred from the data-out buffer with
2219 * the logical blocks read, storing the resulting XOR data in a buffer;
2220 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2221 * blocks transferred from the data-out buffer; and
2222 * 5) transfer the resulting XOR data to the data-in buffer.
2224 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2226 pr_err("Unable to allocate xor_callback buf\n");
2230 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2231 * into the locally allocated *buf
2233 sg_copy_to_buffer(cmd
->t_data_sg
,
2239 * Now perform the XOR against the BIDI read memory located at
2240 * cmd->t_mem_bidi_list
2244 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2245 addr
= kmap_atomic(sg_page(sg
));
2249 for (i
= 0; i
< sg
->length
; i
++)
2250 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2252 offset
+= sg
->length
;
2253 kunmap_atomic(addr
);
2261 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2263 static int transport_get_sense_data(struct se_cmd
*cmd
)
2265 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2266 struct se_device
*dev
= cmd
->se_dev
;
2267 unsigned long flags
;
2270 WARN_ON(!cmd
->se_lun
);
2275 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2276 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2277 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2281 if (!(cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2284 if (!dev
->transport
->get_sense_buffer
) {
2285 pr_err("dev->transport->get_sense_buffer is NULL\n");
2289 sense_buffer
= dev
->transport
->get_sense_buffer(cmd
);
2290 if (!sense_buffer
) {
2291 pr_err("ITT 0x%08x cmd %p: Unable to locate"
2292 " sense buffer for task with sense\n",
2293 cmd
->se_tfo
->get_task_tag(cmd
), cmd
);
2297 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2299 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
, TRANSPORT_SENSE_BUFFER
);
2301 memcpy(&buffer
[offset
], sense_buffer
, TRANSPORT_SENSE_BUFFER
);
2303 /* Automatically padded */
2304 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
2306 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2307 dev
->se_hba
->hba_id
, dev
->transport
->name
, cmd
->scsi_status
);
2311 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2315 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2317 return dev
->transport
->get_blocks(dev
) + 1;
2320 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2322 struct se_device
*dev
= cmd
->se_dev
;
2325 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2328 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2330 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2331 pr_err("LBA: %llu Sectors: %u exceeds"
2332 " transport_dev_end_lba(): %llu\n",
2333 cmd
->t_task_lba
, sectors
,
2334 transport_dev_end_lba(dev
));
2341 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2344 * Determine if the received WRITE_SAME is used to for direct
2345 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2346 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2347 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2349 int passthrough
= (dev
->transport
->transport_type
==
2350 TRANSPORT_PLUGIN_PHBA_PDEV
);
2353 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2354 pr_err("WRITE_SAME PBDATA and LBDATA"
2355 " bits not supported for Block Discard"
2360 * Currently for the emulated case we only accept
2361 * tpws with the UNMAP=1 bit set.
2363 if (!(flags
[0] & 0x08)) {
2364 pr_err("WRITE_SAME w/o UNMAP bit not"
2365 " supported for Block Discard Emulation\n");
2373 /* transport_generic_cmd_sequencer():
2375 * Generic Command Sequencer that should work for most DAS transport
2378 * Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
2381 * FIXME: Need to support other SCSI OPCODES where as well.
2383 static int transport_generic_cmd_sequencer(
2387 struct se_device
*dev
= cmd
->se_dev
;
2388 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2389 int ret
= 0, sector_ret
= 0, passthrough
;
2390 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2394 * Check for an existing UNIT ATTENTION condition
2396 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2397 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2398 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2402 * Check status of Asymmetric Logical Unit Assignment port
2404 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2407 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2408 * The ALUA additional sense code qualifier (ASCQ) is determined
2409 * by the ALUA primary or secondary access state..
2412 pr_debug("[%s]: ALUA TG Port not available,"
2413 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2414 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2416 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2417 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2418 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2421 goto out_invalid_cdb_field
;
2424 * Check status for SPC-3 Persistent Reservations
2426 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2427 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2428 cmd
, cdb
, pr_reg_type
) != 0) {
2429 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2430 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2431 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2432 cmd
->scsi_sense_reason
= TCM_RESERVATION_CONFLICT
;
2436 * This means the CDB is allowed for the SCSI Initiator port
2437 * when said port is *NOT* holding the legacy SPC-2 or
2438 * SPC-3 Persistent Reservation.
2443 * If we operate in passthrough mode we skip most CDB emulation and
2444 * instead hand the commands down to the physical SCSI device.
2447 (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
);
2451 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2453 goto out_unsupported_cdb
;
2454 size
= transport_get_size(sectors
, cdb
, cmd
);
2455 cmd
->t_task_lba
= transport_lba_21(cdb
);
2456 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2459 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2461 goto out_unsupported_cdb
;
2462 size
= transport_get_size(sectors
, cdb
, cmd
);
2463 cmd
->t_task_lba
= transport_lba_32(cdb
);
2464 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2467 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2469 goto out_unsupported_cdb
;
2470 size
= transport_get_size(sectors
, cdb
, cmd
);
2471 cmd
->t_task_lba
= transport_lba_32(cdb
);
2472 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2475 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2477 goto out_unsupported_cdb
;
2478 size
= transport_get_size(sectors
, cdb
, cmd
);
2479 cmd
->t_task_lba
= transport_lba_64(cdb
);
2480 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2483 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2485 goto out_unsupported_cdb
;
2486 size
= transport_get_size(sectors
, cdb
, cmd
);
2487 cmd
->t_task_lba
= transport_lba_21(cdb
);
2488 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2492 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2494 goto out_unsupported_cdb
;
2495 size
= transport_get_size(sectors
, cdb
, cmd
);
2496 cmd
->t_task_lba
= transport_lba_32(cdb
);
2498 cmd
->se_cmd_flags
|= SCF_FUA
;
2499 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2502 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2504 goto out_unsupported_cdb
;
2505 size
= transport_get_size(sectors
, cdb
, cmd
);
2506 cmd
->t_task_lba
= transport_lba_32(cdb
);
2508 cmd
->se_cmd_flags
|= SCF_FUA
;
2509 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2512 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2514 goto out_unsupported_cdb
;
2515 size
= transport_get_size(sectors
, cdb
, cmd
);
2516 cmd
->t_task_lba
= transport_lba_64(cdb
);
2518 cmd
->se_cmd_flags
|= SCF_FUA
;
2519 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2521 case XDWRITEREAD_10
:
2522 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2523 !(cmd
->se_cmd_flags
& SCF_BIDI
))
2524 goto out_invalid_cdb_field
;
2525 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2527 goto out_unsupported_cdb
;
2528 size
= transport_get_size(sectors
, cdb
, cmd
);
2529 cmd
->t_task_lba
= transport_lba_32(cdb
);
2530 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2533 * Do now allow BIDI commands for passthrough mode.
2536 goto out_unsupported_cdb
;
2539 * Setup BIDI XOR callback to be run after I/O completion.
2541 cmd
->transport_complete_callback
= &transport_xor_callback
;
2543 cmd
->se_cmd_flags
|= SCF_FUA
;
2545 case VARIABLE_LENGTH_CMD
:
2546 service_action
= get_unaligned_be16(&cdb
[8]);
2547 switch (service_action
) {
2548 case XDWRITEREAD_32
:
2549 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2551 goto out_unsupported_cdb
;
2552 size
= transport_get_size(sectors
, cdb
, cmd
);
2554 * Use WRITE_32 and READ_32 opcodes for the emulated
2555 * XDWRITE_READ_32 logic.
2557 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2558 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2561 * Do now allow BIDI commands for passthrough mode.
2564 goto out_unsupported_cdb
;
2567 * Setup BIDI XOR callback to be run during after I/O
2570 cmd
->transport_complete_callback
= &transport_xor_callback
;
2572 cmd
->se_cmd_flags
|= SCF_FUA
;
2575 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2577 goto out_unsupported_cdb
;
2580 size
= transport_get_size(1, cdb
, cmd
);
2582 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2584 goto out_invalid_cdb_field
;
2587 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2588 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2590 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2591 goto out_unsupported_cdb
;
2593 cmd
->execute_cmd
= target_emulate_write_same
;
2596 pr_err("VARIABLE_LENGTH_CMD service action"
2597 " 0x%04x not supported\n", service_action
);
2598 goto out_unsupported_cdb
;
2601 case MAINTENANCE_IN
:
2602 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2603 /* MAINTENANCE_IN from SCC-2 */
2605 * Check for emulated MI_REPORT_TARGET_PGS.
2607 if ((cdb
[1] & 0x1f) == MI_REPORT_TARGET_PGS
&&
2608 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2610 target_emulate_report_target_port_groups
;
2612 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2613 (cdb
[8] << 8) | cdb
[9];
2615 /* GPCMD_SEND_KEY from multi media commands */
2616 size
= (cdb
[8] << 8) + cdb
[9];
2618 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2622 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2624 case MODE_SELECT_10
:
2625 size
= (cdb
[7] << 8) + cdb
[8];
2626 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2630 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2632 cmd
->execute_cmd
= target_emulate_modesense
;
2635 size
= (cdb
[7] << 8) + cdb
[8];
2636 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2638 cmd
->execute_cmd
= target_emulate_modesense
;
2640 case GPCMD_READ_BUFFER_CAPACITY
:
2641 case GPCMD_SEND_OPC
:
2644 size
= (cdb
[7] << 8) + cdb
[8];
2645 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2647 case READ_BLOCK_LIMITS
:
2648 size
= READ_BLOCK_LEN
;
2649 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2651 case GPCMD_GET_CONFIGURATION
:
2652 case GPCMD_READ_FORMAT_CAPACITIES
:
2653 case GPCMD_READ_DISC_INFO
:
2654 case GPCMD_READ_TRACK_RZONE_INFO
:
2655 size
= (cdb
[7] << 8) + cdb
[8];
2656 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2658 case PERSISTENT_RESERVE_IN
:
2659 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2660 cmd
->execute_cmd
= target_scsi3_emulate_pr_in
;
2661 size
= (cdb
[7] << 8) + cdb
[8];
2662 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2664 case PERSISTENT_RESERVE_OUT
:
2665 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2666 cmd
->execute_cmd
= target_scsi3_emulate_pr_out
;
2667 size
= (cdb
[7] << 8) + cdb
[8];
2668 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2670 case GPCMD_MECHANISM_STATUS
:
2671 case GPCMD_READ_DVD_STRUCTURE
:
2672 size
= (cdb
[8] << 8) + cdb
[9];
2673 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2676 size
= READ_POSITION_LEN
;
2677 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2679 case MAINTENANCE_OUT
:
2680 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2681 /* MAINTENANCE_OUT from SCC-2
2683 * Check for emulated MO_SET_TARGET_PGS.
2685 if (cdb
[1] == MO_SET_TARGET_PGS
&&
2686 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2688 target_emulate_set_target_port_groups
;
2691 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2692 (cdb
[8] << 8) | cdb
[9];
2694 /* GPCMD_REPORT_KEY from multi media commands */
2695 size
= (cdb
[8] << 8) + cdb
[9];
2697 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2700 size
= (cdb
[3] << 8) + cdb
[4];
2702 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2703 * See spc4r17 section 5.3
2705 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2706 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
2707 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2709 cmd
->execute_cmd
= target_emulate_inquiry
;
2712 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2713 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2716 size
= READ_CAP_LEN
;
2717 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2719 cmd
->execute_cmd
= target_emulate_readcapacity
;
2721 case READ_MEDIA_SERIAL_NUMBER
:
2722 case SECURITY_PROTOCOL_IN
:
2723 case SECURITY_PROTOCOL_OUT
:
2724 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2725 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2727 case SERVICE_ACTION_IN
:
2728 switch (cmd
->t_task_cdb
[1] & 0x1f) {
2729 case SAI_READ_CAPACITY_16
:
2732 target_emulate_readcapacity_16
;
2738 pr_err("Unsupported SA: 0x%02x\n",
2739 cmd
->t_task_cdb
[1] & 0x1f);
2740 goto out_invalid_cdb_field
;
2743 case ACCESS_CONTROL_IN
:
2744 case ACCESS_CONTROL_OUT
:
2746 case READ_ATTRIBUTE
:
2747 case RECEIVE_COPY_RESULTS
:
2748 case WRITE_ATTRIBUTE
:
2749 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
2750 (cdb
[12] << 8) | cdb
[13];
2751 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2753 case RECEIVE_DIAGNOSTIC
:
2754 case SEND_DIAGNOSTIC
:
2755 size
= (cdb
[3] << 8) | cdb
[4];
2756 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2758 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2761 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2762 size
= (2336 * sectors
);
2763 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2768 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2772 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2774 cmd
->execute_cmd
= target_emulate_request_sense
;
2776 case READ_ELEMENT_STATUS
:
2777 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
2778 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2781 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2782 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2787 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2788 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2790 if (cdb
[0] == RESERVE_10
)
2791 size
= (cdb
[7] << 8) | cdb
[8];
2793 size
= cmd
->data_length
;
2796 * Setup the legacy emulated handler for SPC-2 and
2797 * >= SPC-3 compatible reservation handling (CRH=1)
2798 * Otherwise, we assume the underlying SCSI logic is
2799 * is running in SPC_PASSTHROUGH, and wants reservations
2800 * emulation disabled.
2802 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2803 cmd
->execute_cmd
= target_scsi2_reservation_reserve
;
2804 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2809 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2810 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2812 if (cdb
[0] == RELEASE_10
)
2813 size
= (cdb
[7] << 8) | cdb
[8];
2815 size
= cmd
->data_length
;
2817 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2818 cmd
->execute_cmd
= target_scsi2_reservation_release
;
2819 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2821 case SYNCHRONIZE_CACHE
:
2822 case SYNCHRONIZE_CACHE_16
:
2824 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2826 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
2827 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2828 cmd
->t_task_lba
= transport_lba_32(cdb
);
2830 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2831 cmd
->t_task_lba
= transport_lba_64(cdb
);
2834 goto out_unsupported_cdb
;
2836 size
= transport_get_size(sectors
, cdb
, cmd
);
2837 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2843 * Check to ensure that LBA + Range does not exceed past end of
2844 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2846 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
2847 if (transport_cmd_get_valid_sectors(cmd
) < 0)
2848 goto out_invalid_cdb_field
;
2850 cmd
->execute_cmd
= target_emulate_synchronize_cache
;
2853 size
= get_unaligned_be16(&cdb
[7]);
2854 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2856 cmd
->execute_cmd
= target_emulate_unmap
;
2859 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2861 goto out_unsupported_cdb
;
2864 size
= transport_get_size(1, cdb
, cmd
);
2866 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2867 goto out_invalid_cdb_field
;
2870 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
2871 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2873 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2874 goto out_unsupported_cdb
;
2876 cmd
->execute_cmd
= target_emulate_write_same
;
2879 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2881 goto out_unsupported_cdb
;
2884 size
= transport_get_size(1, cdb
, cmd
);
2886 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2887 goto out_invalid_cdb_field
;
2890 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
2891 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2893 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2894 * of byte 1 bit 3 UNMAP instead of original reserved field
2896 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2897 goto out_unsupported_cdb
;
2899 cmd
->execute_cmd
= target_emulate_write_same
;
2901 case ALLOW_MEDIUM_REMOVAL
:
2907 case TEST_UNIT_READY
:
2909 case WRITE_FILEMARKS
:
2910 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2912 cmd
->execute_cmd
= target_emulate_noop
;
2914 case GPCMD_CLOSE_TRACK
:
2915 case INITIALIZE_ELEMENT_STATUS
:
2916 case GPCMD_LOAD_UNLOAD
:
2917 case GPCMD_SET_SPEED
:
2919 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2922 cmd
->execute_cmd
= target_report_luns
;
2923 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2925 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2926 * See spc4r17 section 5.3
2928 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2929 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
2930 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2932 case GET_EVENT_STATUS_NOTIFICATION
:
2933 size
= (cdb
[7] << 8) | cdb
[8];
2934 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2937 /* Only support ATA passthrough to pSCSI backends.. */
2939 goto out_unsupported_cdb
;
2942 switch (cdb
[2] & 0x3) {
2947 sectors
= (((cdb
[1] & 0x1) ? cdb
[3] : 0) << 8) | cdb
[4];
2950 sectors
= (((cdb
[1] & 0x1) ? cdb
[5] : 0) << 8) | cdb
[6];
2953 pr_err("T_LENGTH=0x3 not supported for ATA_16\n");
2954 goto out_invalid_cdb_field
;
2959 /* BLOCK T_TYPE: 512 or sector */
2960 size
= sectors
* ((cdb
[2] & 0x10) ?
2961 dev
->se_sub_dev
->se_dev_attrib
.block_size
: 512);
2966 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2969 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
2970 " 0x%02x, sending CHECK_CONDITION.\n",
2971 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
2972 goto out_unsupported_cdb
;
2975 if (cmd
->unknown_data_length
)
2976 cmd
->data_length
= size
;
2978 if (size
!= cmd
->data_length
) {
2979 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
2980 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
2981 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
2982 cmd
->data_length
, size
, cdb
[0]);
2984 cmd
->cmd_spdtl
= size
;
2986 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
2987 pr_err("Rejecting underflow/overflow"
2989 goto out_invalid_cdb_field
;
2992 * Reject READ_* or WRITE_* with overflow/underflow for
2993 * type SCF_SCSI_DATA_SG_IO_CDB.
2995 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
2996 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
2997 " CDB on non 512-byte sector setup subsystem"
2998 " plugin: %s\n", dev
->transport
->name
);
2999 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3000 goto out_invalid_cdb_field
;
3003 if (size
> cmd
->data_length
) {
3004 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3005 cmd
->residual_count
= (size
- cmd
->data_length
);
3007 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3008 cmd
->residual_count
= (cmd
->data_length
- size
);
3010 cmd
->data_length
= size
;
3013 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
3014 if (sectors
> su_dev
->se_dev_attrib
.fabric_max_sectors
) {
3015 printk_ratelimited(KERN_ERR
"SCSI OP %02xh with too"
3016 " big sectors %u exceeds fabric_max_sectors:"
3017 " %u\n", cdb
[0], sectors
,
3018 su_dev
->se_dev_attrib
.fabric_max_sectors
);
3019 goto out_invalid_cdb_field
;
3021 if (sectors
> su_dev
->se_dev_attrib
.hw_max_sectors
) {
3022 printk_ratelimited(KERN_ERR
"SCSI OP %02xh with too"
3023 " big sectors %u exceeds backend hw_max_sectors:"
3024 " %u\n", cdb
[0], sectors
,
3025 su_dev
->se_dev_attrib
.hw_max_sectors
);
3026 goto out_invalid_cdb_field
;
3030 /* reject any command that we don't have a handler for */
3031 if (!(passthrough
|| cmd
->execute_cmd
||
3032 (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
3033 goto out_unsupported_cdb
;
3035 transport_set_supported_SAM_opcode(cmd
);
3038 out_unsupported_cdb
:
3039 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3040 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3042 out_invalid_cdb_field
:
3043 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3044 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3049 * Called from I/O completion to determine which dormant/delayed
3050 * and ordered cmds need to have their tasks added to the execution queue.
3052 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3054 struct se_device
*dev
= cmd
->se_dev
;
3055 struct se_cmd
*cmd_p
, *cmd_tmp
;
3056 int new_active_tasks
= 0;
3058 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3059 atomic_dec(&dev
->simple_cmds
);
3060 smp_mb__after_atomic_dec();
3061 dev
->dev_cur_ordered_id
++;
3062 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3063 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3064 cmd
->se_ordered_id
);
3065 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3066 dev
->dev_cur_ordered_id
++;
3067 pr_debug("Incremented dev_cur_ordered_id: %u for"
3068 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3069 cmd
->se_ordered_id
);
3070 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3071 atomic_dec(&dev
->dev_ordered_sync
);
3072 smp_mb__after_atomic_dec();
3074 dev
->dev_cur_ordered_id
++;
3075 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3076 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3079 * Process all commands up to the last received
3080 * ORDERED task attribute which requires another blocking
3083 spin_lock(&dev
->delayed_cmd_lock
);
3084 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3085 &dev
->delayed_cmd_list
, se_delayed_node
) {
3087 list_del(&cmd_p
->se_delayed_node
);
3088 spin_unlock(&dev
->delayed_cmd_lock
);
3090 pr_debug("Calling add_tasks() for"
3091 " cmd_p: 0x%02x Task Attr: 0x%02x"
3092 " Dormant -> Active, se_ordered_id: %u\n",
3093 cmd_p
->t_task_cdb
[0],
3094 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3096 target_add_to_execute_list(cmd_p
);
3099 spin_lock(&dev
->delayed_cmd_lock
);
3100 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3103 spin_unlock(&dev
->delayed_cmd_lock
);
3105 * If new tasks have become active, wake up the transport thread
3106 * to do the processing of the Active tasks.
3108 if (new_active_tasks
!= 0)
3109 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3112 static void transport_complete_qf(struct se_cmd
*cmd
)
3116 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3117 transport_complete_task_attr(cmd
);
3119 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3120 ret
= cmd
->se_tfo
->queue_status(cmd
);
3125 switch (cmd
->data_direction
) {
3126 case DMA_FROM_DEVICE
:
3127 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3130 if (cmd
->t_bidi_data_sg
) {
3131 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3135 /* Fall through for DMA_TO_DEVICE */
3137 ret
= cmd
->se_tfo
->queue_status(cmd
);
3145 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3148 transport_lun_remove_cmd(cmd
);
3149 transport_cmd_check_stop_to_fabric(cmd
);
3152 static void transport_handle_queue_full(
3154 struct se_device
*dev
)
3156 spin_lock_irq(&dev
->qf_cmd_lock
);
3157 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3158 atomic_inc(&dev
->dev_qf_count
);
3159 smp_mb__after_atomic_inc();
3160 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3162 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3165 static void target_complete_ok_work(struct work_struct
*work
)
3167 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3168 int reason
= 0, ret
;
3171 * Check if we need to move delayed/dormant tasks from cmds on the
3172 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3175 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3176 transport_complete_task_attr(cmd
);
3178 * Check to schedule QUEUE_FULL work, or execute an existing
3179 * cmd->transport_qf_callback()
3181 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3182 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3185 * Check if we need to retrieve a sense buffer from
3186 * the struct se_cmd in question.
3188 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3189 if (transport_get_sense_data(cmd
) < 0)
3190 reason
= TCM_NON_EXISTENT_LUN
;
3192 if (cmd
->scsi_status
) {
3193 ret
= transport_send_check_condition_and_sense(
3195 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3198 transport_lun_remove_cmd(cmd
);
3199 transport_cmd_check_stop_to_fabric(cmd
);
3204 * Check for a callback, used by amongst other things
3205 * XDWRITE_READ_10 emulation.
3207 if (cmd
->transport_complete_callback
)
3208 cmd
->transport_complete_callback(cmd
);
3210 switch (cmd
->data_direction
) {
3211 case DMA_FROM_DEVICE
:
3212 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3213 if (cmd
->se_lun
->lun_sep
) {
3214 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3217 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3219 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3220 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3224 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3225 if (cmd
->se_lun
->lun_sep
) {
3226 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3229 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3231 * Check if we need to send READ payload for BIDI-COMMAND
3233 if (cmd
->t_bidi_data_sg
) {
3234 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3235 if (cmd
->se_lun
->lun_sep
) {
3236 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3239 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3240 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3241 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3245 /* Fall through for DMA_TO_DEVICE */
3247 ret
= cmd
->se_tfo
->queue_status(cmd
);
3248 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3255 transport_lun_remove_cmd(cmd
);
3256 transport_cmd_check_stop_to_fabric(cmd
);
3260 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3261 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3262 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3263 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3266 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3268 struct scatterlist
*sg
;
3271 for_each_sg(sgl
, sg
, nents
, count
)
3272 __free_page(sg_page(sg
));
3277 static inline void transport_free_pages(struct se_cmd
*cmd
)
3279 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3282 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3283 cmd
->t_data_sg
= NULL
;
3284 cmd
->t_data_nents
= 0;
3286 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3287 cmd
->t_bidi_data_sg
= NULL
;
3288 cmd
->t_bidi_data_nents
= 0;
3292 * transport_release_cmd - free a command
3293 * @cmd: command to free
3295 * This routine unconditionally frees a command, and reference counting
3296 * or list removal must be done in the caller.
3298 static void transport_release_cmd(struct se_cmd
*cmd
)
3300 BUG_ON(!cmd
->se_tfo
);
3302 if (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
3303 core_tmr_release_req(cmd
->se_tmr_req
);
3304 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
3305 kfree(cmd
->t_task_cdb
);
3307 * If this cmd has been setup with target_get_sess_cmd(), drop
3308 * the kref and call ->release_cmd() in kref callback.
3310 if (cmd
->check_release
!= 0) {
3311 target_put_sess_cmd(cmd
->se_sess
, cmd
);
3314 cmd
->se_tfo
->release_cmd(cmd
);
3318 * transport_put_cmd - release a reference to a command
3319 * @cmd: command to release
3321 * This routine releases our reference to the command and frees it if possible.
3323 static void transport_put_cmd(struct se_cmd
*cmd
)
3325 unsigned long flags
;
3327 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3328 if (atomic_read(&cmd
->t_fe_count
)) {
3329 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3333 if (cmd
->transport_state
& CMD_T_DEV_ACTIVE
) {
3334 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
3335 target_remove_from_state_list(cmd
);
3337 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3339 transport_free_pages(cmd
);
3340 transport_release_cmd(cmd
);
3343 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3347 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3348 * allocating in the core.
3349 * @cmd: Associated se_cmd descriptor
3350 * @mem: SGL style memory for TCM WRITE / READ
3351 * @sg_mem_num: Number of SGL elements
3352 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3353 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3355 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3358 int transport_generic_map_mem_to_cmd(
3360 struct scatterlist
*sgl
,
3362 struct scatterlist
*sgl_bidi
,
3365 if (!sgl
|| !sgl_count
)
3368 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3369 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3371 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3372 * scatterlists already have been set to follow what the fabric
3373 * passes for the original expected data transfer length.
3375 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3376 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3377 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3378 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3379 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3383 cmd
->t_data_sg
= sgl
;
3384 cmd
->t_data_nents
= sgl_count
;
3386 if (sgl_bidi
&& sgl_bidi_count
) {
3387 cmd
->t_bidi_data_sg
= sgl_bidi
;
3388 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3390 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3395 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3397 void *transport_kmap_data_sg(struct se_cmd
*cmd
)
3399 struct scatterlist
*sg
= cmd
->t_data_sg
;
3400 struct page
**pages
;
3405 * We need to take into account a possible offset here for fabrics like
3406 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3407 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3409 if (!cmd
->t_data_nents
)
3411 else if (cmd
->t_data_nents
== 1)
3412 return kmap(sg_page(sg
)) + sg
->offset
;
3414 /* >1 page. use vmap */
3415 pages
= kmalloc(sizeof(*pages
) * cmd
->t_data_nents
, GFP_KERNEL
);
3419 /* convert sg[] to pages[] */
3420 for_each_sg(cmd
->t_data_sg
, sg
, cmd
->t_data_nents
, i
) {
3421 pages
[i
] = sg_page(sg
);
3424 cmd
->t_data_vmap
= vmap(pages
, cmd
->t_data_nents
, VM_MAP
, PAGE_KERNEL
);
3426 if (!cmd
->t_data_vmap
)
3429 return cmd
->t_data_vmap
+ cmd
->t_data_sg
[0].offset
;
3431 EXPORT_SYMBOL(transport_kmap_data_sg
);
3433 void transport_kunmap_data_sg(struct se_cmd
*cmd
)
3435 if (!cmd
->t_data_nents
) {
3437 } else if (cmd
->t_data_nents
== 1) {
3438 kunmap(sg_page(cmd
->t_data_sg
));
3442 vunmap(cmd
->t_data_vmap
);
3443 cmd
->t_data_vmap
= NULL
;
3445 EXPORT_SYMBOL(transport_kunmap_data_sg
);
3448 transport_generic_get_mem(struct se_cmd
*cmd
)
3450 u32 length
= cmd
->data_length
;
3456 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3457 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3458 if (!cmd
->t_data_sg
)
3461 cmd
->t_data_nents
= nents
;
3462 sg_init_table(cmd
->t_data_sg
, nents
);
3464 zero_flag
= cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
? 0 : __GFP_ZERO
;
3467 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3468 page
= alloc_page(GFP_KERNEL
| zero_flag
);
3472 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3480 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3483 kfree(cmd
->t_data_sg
);
3484 cmd
->t_data_sg
= NULL
;
3489 * Allocate any required resources to execute the command. For writes we
3490 * might not have the payload yet, so notify the fabric via a call to
3491 * ->write_pending instead. Otherwise place it on the execution queue.
3493 int transport_generic_new_cmd(struct se_cmd
*cmd
)
3495 struct se_device
*dev
= cmd
->se_dev
;
3499 * Determine is the TCM fabric module has already allocated physical
3500 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3503 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
3505 ret
= transport_generic_get_mem(cmd
);
3510 /* Workaround for handling zero-length control CDBs */
3511 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3512 !cmd
->data_length
) {
3513 spin_lock_irq(&cmd
->t_state_lock
);
3514 cmd
->t_state
= TRANSPORT_COMPLETE
;
3515 cmd
->transport_state
|= CMD_T_ACTIVE
;
3516 spin_unlock_irq(&cmd
->t_state_lock
);
3518 if (cmd
->t_task_cdb
[0] == REQUEST_SENSE
) {
3519 u8 ua_asc
= 0, ua_ascq
= 0;
3521 core_scsi3_ua_clear_for_request_sense(cmd
,
3525 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
3526 queue_work(target_completion_wq
, &cmd
->work
);
3530 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
3531 struct se_dev_attrib
*attr
= &dev
->se_sub_dev
->se_dev_attrib
;
3533 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3536 BUG_ON(cmd
->data_length
% attr
->block_size
);
3537 BUG_ON(DIV_ROUND_UP(cmd
->data_length
, attr
->block_size
) >
3538 attr
->hw_max_sectors
);
3541 atomic_inc(&cmd
->t_fe_count
);
3544 * For WRITEs, let the fabric know its buffer is ready.
3546 * The command will be added to the execution queue after its write
3549 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3550 target_add_to_state_list(cmd
);
3551 return transport_generic_write_pending(cmd
);
3554 * Everything else but a WRITE, add the command to the execution queue.
3556 transport_execute_tasks(cmd
);
3560 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3561 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3564 EXPORT_SYMBOL(transport_generic_new_cmd
);
3566 /* transport_generic_process_write():
3570 void transport_generic_process_write(struct se_cmd
*cmd
)
3572 transport_execute_tasks(cmd
);
3574 EXPORT_SYMBOL(transport_generic_process_write
);
3576 static void transport_write_pending_qf(struct se_cmd
*cmd
)
3580 ret
= cmd
->se_tfo
->write_pending(cmd
);
3581 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
3582 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3584 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3588 static int transport_generic_write_pending(struct se_cmd
*cmd
)
3590 unsigned long flags
;
3593 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3594 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
3595 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3598 * Clear the se_cmd for WRITE_PENDING status in order to set
3599 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3600 * from HW target mode interrupt code. This is safe to be called
3601 * with transport_off=1 before the cmd->se_tfo->write_pending
3602 * because the se_cmd->se_lun pointer is not being cleared.
3604 transport_cmd_check_stop(cmd
, 1, 0);
3607 * Call the fabric write_pending function here to let the
3608 * frontend know that WRITE buffers are ready.
3610 ret
= cmd
->se_tfo
->write_pending(cmd
);
3611 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3619 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
3620 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
3621 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3625 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
3627 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
3628 if (wait_for_tasks
&& (cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
))
3629 transport_wait_for_tasks(cmd
);
3631 transport_release_cmd(cmd
);
3634 transport_wait_for_tasks(cmd
);
3636 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
3639 transport_lun_remove_cmd(cmd
);
3641 transport_put_cmd(cmd
);
3644 EXPORT_SYMBOL(transport_generic_free_cmd
);
3646 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3647 * @se_sess: session to reference
3648 * @se_cmd: command descriptor to add
3649 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
3651 void target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
,
3654 unsigned long flags
;
3656 kref_init(&se_cmd
->cmd_kref
);
3658 * Add a second kref if the fabric caller is expecting to handle
3659 * fabric acknowledgement that requires two target_put_sess_cmd()
3660 * invocations before se_cmd descriptor release.
3662 if (ack_kref
== true) {
3663 kref_get(&se_cmd
->cmd_kref
);
3664 se_cmd
->se_cmd_flags
|= SCF_ACK_KREF
;
3667 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3668 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
3669 se_cmd
->check_release
= 1;
3670 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3672 EXPORT_SYMBOL(target_get_sess_cmd
);
3674 static void target_release_cmd_kref(struct kref
*kref
)
3676 struct se_cmd
*se_cmd
= container_of(kref
, struct se_cmd
, cmd_kref
);
3677 struct se_session
*se_sess
= se_cmd
->se_sess
;
3678 unsigned long flags
;
3680 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3681 if (list_empty(&se_cmd
->se_cmd_list
)) {
3682 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3683 se_cmd
->se_tfo
->release_cmd(se_cmd
);
3686 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
3687 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3688 complete(&se_cmd
->cmd_wait_comp
);
3691 list_del(&se_cmd
->se_cmd_list
);
3692 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3694 se_cmd
->se_tfo
->release_cmd(se_cmd
);
3697 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3698 * @se_sess: session to reference
3699 * @se_cmd: command descriptor to drop
3701 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
3703 return kref_put(&se_cmd
->cmd_kref
, target_release_cmd_kref
);
3705 EXPORT_SYMBOL(target_put_sess_cmd
);
3707 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3708 * @se_sess: session to split
3710 void target_splice_sess_cmd_list(struct se_session
*se_sess
)
3712 struct se_cmd
*se_cmd
;
3713 unsigned long flags
;
3715 WARN_ON(!list_empty(&se_sess
->sess_wait_list
));
3716 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
3718 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3719 se_sess
->sess_tearing_down
= 1;
3721 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
3723 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
3724 se_cmd
->cmd_wait_set
= 1;
3726 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3728 EXPORT_SYMBOL(target_splice_sess_cmd_list
);
3730 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
3731 * @se_sess: session to wait for active I/O
3732 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3734 void target_wait_for_sess_cmds(
3735 struct se_session
*se_sess
,
3738 struct se_cmd
*se_cmd
, *tmp_cmd
;
3741 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
3742 &se_sess
->sess_wait_list
, se_cmd_list
) {
3743 list_del(&se_cmd
->se_cmd_list
);
3745 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3746 " %d\n", se_cmd
, se_cmd
->t_state
,
3747 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3749 if (wait_for_tasks
) {
3750 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3751 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
3752 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3754 rc
= transport_wait_for_tasks(se_cmd
);
3756 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3757 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
3758 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3762 wait_for_completion(&se_cmd
->cmd_wait_comp
);
3763 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3764 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
3765 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
3768 se_cmd
->se_tfo
->release_cmd(se_cmd
);
3771 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
3773 /* transport_lun_wait_for_tasks():
3775 * Called from ConfigFS context to stop the passed struct se_cmd to allow
3776 * an struct se_lun to be successfully shutdown.
3778 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
3780 unsigned long flags
;
3784 * If the frontend has already requested this struct se_cmd to
3785 * be stopped, we can safely ignore this struct se_cmd.
3787 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3788 if (cmd
->transport_state
& CMD_T_STOP
) {
3789 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
3791 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3792 cmd
->se_tfo
->get_task_tag(cmd
));
3793 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3794 transport_cmd_check_stop(cmd
, 1, 0);
3797 cmd
->transport_state
|= CMD_T_LUN_FE_STOP
;
3798 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3800 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
3802 // XXX: audit task_flags checks.
3803 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3804 if ((cmd
->transport_state
& CMD_T_BUSY
) &&
3805 (cmd
->transport_state
& CMD_T_SENT
)) {
3806 if (!target_stop_cmd(cmd
, &flags
))
3808 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3810 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3812 target_remove_from_execute_list(cmd
);
3815 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3818 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
3819 cmd
->se_tfo
->get_task_tag(cmd
));
3820 wait_for_completion(&cmd
->transport_lun_stop_comp
);
3821 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
3822 cmd
->se_tfo
->get_task_tag(cmd
));
3824 transport_remove_cmd_from_queue(cmd
);
3829 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
3831 struct se_cmd
*cmd
= NULL
;
3832 unsigned long lun_flags
, cmd_flags
;
3834 * Do exception processing and return CHECK_CONDITION status to the
3837 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3838 while (!list_empty(&lun
->lun_cmd_list
)) {
3839 cmd
= list_first_entry(&lun
->lun_cmd_list
,
3840 struct se_cmd
, se_lun_node
);
3841 list_del_init(&cmd
->se_lun_node
);
3844 * This will notify iscsi_target_transport.c:
3845 * transport_cmd_check_stop() that a LUN shutdown is in
3846 * progress for the iscsi_cmd_t.
3848 spin_lock(&cmd
->t_state_lock
);
3849 pr_debug("SE_LUN[%d] - Setting cmd->transport"
3850 "_lun_stop for ITT: 0x%08x\n",
3851 cmd
->se_lun
->unpacked_lun
,
3852 cmd
->se_tfo
->get_task_tag(cmd
));
3853 cmd
->transport_state
|= CMD_T_LUN_STOP
;
3854 spin_unlock(&cmd
->t_state_lock
);
3856 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
3859 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
3860 cmd
->se_tfo
->get_task_tag(cmd
),
3861 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
3865 * If the Storage engine still owns the iscsi_cmd_t, determine
3866 * and/or stop its context.
3868 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
3869 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
3870 cmd
->se_tfo
->get_task_tag(cmd
));
3872 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
3873 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3877 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
3878 "_wait_for_tasks(): SUCCESS\n",
3879 cmd
->se_lun
->unpacked_lun
,
3880 cmd
->se_tfo
->get_task_tag(cmd
));
3882 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
3883 if (!(cmd
->transport_state
& CMD_T_DEV_ACTIVE
)) {
3884 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
3887 cmd
->transport_state
&= ~CMD_T_DEV_ACTIVE
;
3888 target_remove_from_state_list(cmd
);
3889 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
3892 * The Storage engine stopped this struct se_cmd before it was
3893 * send to the fabric frontend for delivery back to the
3894 * Initiator Node. Return this SCSI CDB back with an
3895 * CHECK_CONDITION status.
3898 transport_send_check_condition_and_sense(cmd
,
3899 TCM_NON_EXISTENT_LUN
, 0);
3901 * If the fabric frontend is waiting for this iscsi_cmd_t to
3902 * be released, notify the waiting thread now that LU has
3903 * finished accessing it.
3905 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
3906 if (cmd
->transport_state
& CMD_T_LUN_FE_STOP
) {
3907 pr_debug("SE_LUN[%d] - Detected FE stop for"
3908 " struct se_cmd: %p ITT: 0x%08x\n",
3910 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
3912 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3914 transport_cmd_check_stop(cmd
, 1, 0);
3915 complete(&cmd
->transport_lun_fe_stop_comp
);
3916 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3919 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
3920 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
3922 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
3923 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
3925 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
3928 static int transport_clear_lun_thread(void *p
)
3930 struct se_lun
*lun
= p
;
3932 __transport_clear_lun_from_sessions(lun
);
3933 complete(&lun
->lun_shutdown_comp
);
3938 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
3940 struct task_struct
*kt
;
3942 kt
= kthread_run(transport_clear_lun_thread
, lun
,
3943 "tcm_cl_%u", lun
->unpacked_lun
);
3945 pr_err("Unable to start clear_lun thread\n");
3948 wait_for_completion(&lun
->lun_shutdown_comp
);
3954 * transport_wait_for_tasks - wait for completion to occur
3955 * @cmd: command to wait
3957 * Called from frontend fabric context to wait for storage engine
3958 * to pause and/or release frontend generated struct se_cmd.
3960 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
3962 unsigned long flags
;
3964 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3965 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) &&
3966 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
3967 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3971 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3972 * has been set in transport_set_supported_SAM_opcode().
3974 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) &&
3975 !(cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)) {
3976 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3980 * If we are already stopped due to an external event (ie: LUN shutdown)
3981 * sleep until the connection can have the passed struct se_cmd back.
3982 * The cmd->transport_lun_stopped_sem will be upped by
3983 * transport_clear_lun_from_sessions() once the ConfigFS context caller
3984 * has completed its operation on the struct se_cmd.
3986 if (cmd
->transport_state
& CMD_T_LUN_STOP
) {
3987 pr_debug("wait_for_tasks: Stopping"
3988 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
3989 "_stop_comp); for ITT: 0x%08x\n",
3990 cmd
->se_tfo
->get_task_tag(cmd
));
3992 * There is a special case for WRITES where a FE exception +
3993 * LUN shutdown means ConfigFS context is still sleeping on
3994 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3995 * We go ahead and up transport_lun_stop_comp just to be sure
3998 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3999 complete(&cmd
->transport_lun_stop_comp
);
4000 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4001 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4003 target_remove_from_state_list(cmd
);
4005 * At this point, the frontend who was the originator of this
4006 * struct se_cmd, now owns the structure and can be released through
4007 * normal means below.
4009 pr_debug("wait_for_tasks: Stopped"
4010 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4011 "stop_comp); for ITT: 0x%08x\n",
4012 cmd
->se_tfo
->get_task_tag(cmd
));
4014 cmd
->transport_state
&= ~CMD_T_LUN_STOP
;
4017 if (!(cmd
->transport_state
& CMD_T_ACTIVE
)) {
4018 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4022 cmd
->transport_state
|= CMD_T_STOP
;
4024 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4025 " i_state: %d, t_state: %d, CMD_T_STOP\n",
4026 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4027 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4029 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4031 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4033 wait_for_completion(&cmd
->t_transport_stop_comp
);
4035 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4036 cmd
->transport_state
&= ~(CMD_T_ACTIVE
| CMD_T_STOP
);
4038 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4039 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4040 cmd
->se_tfo
->get_task_tag(cmd
));
4042 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4046 EXPORT_SYMBOL(transport_wait_for_tasks
);
4048 static int transport_get_sense_codes(
4053 *asc
= cmd
->scsi_asc
;
4054 *ascq
= cmd
->scsi_ascq
;
4059 static int transport_set_sense_codes(
4064 cmd
->scsi_asc
= asc
;
4065 cmd
->scsi_ascq
= ascq
;
4070 int transport_send_check_condition_and_sense(
4075 unsigned char *buffer
= cmd
->sense_buffer
;
4076 unsigned long flags
;
4078 u8 asc
= 0, ascq
= 0;
4080 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4081 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4082 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4085 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4086 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4088 if (!reason
&& from_transport
)
4091 if (!from_transport
)
4092 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4094 * Data Segment and SenseLength of the fabric response PDU.
4096 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4097 * from include/scsi/scsi_cmnd.h
4099 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4100 TRANSPORT_SENSE_BUFFER
);
4102 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4103 * SENSE KEY values from include/scsi/scsi.h
4106 case TCM_NON_EXISTENT_LUN
:
4108 buffer
[offset
] = 0x70;
4109 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4110 /* ILLEGAL REQUEST */
4111 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4112 /* LOGICAL UNIT NOT SUPPORTED */
4113 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4115 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4116 case TCM_SECTOR_COUNT_TOO_MANY
:
4118 buffer
[offset
] = 0x70;
4119 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4120 /* ILLEGAL REQUEST */
4121 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4122 /* INVALID COMMAND OPERATION CODE */
4123 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4125 case TCM_UNKNOWN_MODE_PAGE
:
4127 buffer
[offset
] = 0x70;
4128 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4129 /* ILLEGAL REQUEST */
4130 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4131 /* INVALID FIELD IN CDB */
4132 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4134 case TCM_CHECK_CONDITION_ABORT_CMD
:
4136 buffer
[offset
] = 0x70;
4137 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4138 /* ABORTED COMMAND */
4139 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4140 /* BUS DEVICE RESET FUNCTION OCCURRED */
4141 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4142 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4144 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4146 buffer
[offset
] = 0x70;
4147 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4148 /* ABORTED COMMAND */
4149 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4151 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4152 /* NOT ENOUGH UNSOLICITED DATA */
4153 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4155 case TCM_INVALID_CDB_FIELD
:
4157 buffer
[offset
] = 0x70;
4158 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4159 /* ILLEGAL REQUEST */
4160 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4161 /* INVALID FIELD IN CDB */
4162 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4164 case TCM_INVALID_PARAMETER_LIST
:
4166 buffer
[offset
] = 0x70;
4167 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4168 /* ILLEGAL REQUEST */
4169 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4170 /* INVALID FIELD IN PARAMETER LIST */
4171 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4173 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4175 buffer
[offset
] = 0x70;
4176 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4177 /* ABORTED COMMAND */
4178 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4180 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4181 /* UNEXPECTED_UNSOLICITED_DATA */
4182 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4184 case TCM_SERVICE_CRC_ERROR
:
4186 buffer
[offset
] = 0x70;
4187 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4188 /* ABORTED COMMAND */
4189 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4190 /* PROTOCOL SERVICE CRC ERROR */
4191 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4193 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4195 case TCM_SNACK_REJECTED
:
4197 buffer
[offset
] = 0x70;
4198 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4199 /* ABORTED COMMAND */
4200 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4202 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4203 /* FAILED RETRANSMISSION REQUEST */
4204 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4206 case TCM_WRITE_PROTECTED
:
4208 buffer
[offset
] = 0x70;
4209 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4211 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4212 /* WRITE PROTECTED */
4213 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4215 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4217 buffer
[offset
] = 0x70;
4218 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4219 /* UNIT ATTENTION */
4220 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4221 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4222 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4223 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4225 case TCM_CHECK_CONDITION_NOT_READY
:
4227 buffer
[offset
] = 0x70;
4228 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4230 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4231 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4232 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4233 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4235 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4238 buffer
[offset
] = 0x70;
4239 buffer
[offset
+SPC_ADD_SENSE_LEN_OFFSET
] = 10;
4240 /* ILLEGAL REQUEST */
4241 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4242 /* LOGICAL UNIT COMMUNICATION FAILURE */
4243 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4247 * This code uses linux/include/scsi/scsi.h SAM status codes!
4249 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4251 * Automatically padded, this value is encoded in the fabric's
4252 * data_length response PDU containing the SCSI defined sense data.
4254 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4257 return cmd
->se_tfo
->queue_status(cmd
);
4259 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4261 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4265 if (cmd
->transport_state
& CMD_T_ABORTED
) {
4267 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4270 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4271 " status for CDB: 0x%02x ITT: 0x%08x\n",
4273 cmd
->se_tfo
->get_task_tag(cmd
));
4275 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4276 cmd
->se_tfo
->queue_status(cmd
);
4281 EXPORT_SYMBOL(transport_check_aborted_status
);
4283 void transport_send_task_abort(struct se_cmd
*cmd
)
4285 unsigned long flags
;
4287 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4288 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4289 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4292 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4295 * If there are still expected incoming fabric WRITEs, we wait
4296 * until until they have completed before sending a TASK_ABORTED
4297 * response. This response with TASK_ABORTED status will be
4298 * queued back to fabric module by transport_check_aborted_status().
4300 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4301 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4302 cmd
->transport_state
|= CMD_T_ABORTED
;
4303 smp_mb__after_atomic_inc();
4306 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4308 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4309 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4310 cmd
->se_tfo
->get_task_tag(cmd
));
4312 cmd
->se_tfo
->queue_status(cmd
);
4315 static int transport_generic_do_tmr(struct se_cmd
*cmd
)
4317 struct se_device
*dev
= cmd
->se_dev
;
4318 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4321 switch (tmr
->function
) {
4322 case TMR_ABORT_TASK
:
4323 core_tmr_abort_task(dev
, tmr
, cmd
->se_sess
);
4325 case TMR_ABORT_TASK_SET
:
4327 case TMR_CLEAR_TASK_SET
:
4328 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4331 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4332 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4333 TMR_FUNCTION_REJECTED
;
4335 case TMR_TARGET_WARM_RESET
:
4336 tmr
->response
= TMR_FUNCTION_REJECTED
;
4338 case TMR_TARGET_COLD_RESET
:
4339 tmr
->response
= TMR_FUNCTION_REJECTED
;
4342 pr_err("Uknown TMR function: 0x%02x.\n",
4344 tmr
->response
= TMR_FUNCTION_REJECTED
;
4348 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4349 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4351 transport_cmd_check_stop_to_fabric(cmd
);
4355 /* transport_processing_thread():
4359 static int transport_processing_thread(void *param
)
4363 struct se_device
*dev
= param
;
4365 while (!kthread_should_stop()) {
4366 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4367 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4368 kthread_should_stop());
4373 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4377 switch (cmd
->t_state
) {
4378 case TRANSPORT_NEW_CMD
:
4381 case TRANSPORT_NEW_CMD_MAP
:
4382 if (!cmd
->se_tfo
->new_cmd_map
) {
4383 pr_err("cmd->se_tfo->new_cmd_map is"
4384 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4387 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4389 transport_generic_request_failure(cmd
);
4392 ret
= transport_generic_new_cmd(cmd
);
4394 transport_generic_request_failure(cmd
);
4398 case TRANSPORT_PROCESS_WRITE
:
4399 transport_generic_process_write(cmd
);
4401 case TRANSPORT_PROCESS_TMR
:
4402 transport_generic_do_tmr(cmd
);
4404 case TRANSPORT_COMPLETE_QF_WP
:
4405 transport_write_pending_qf(cmd
);
4407 case TRANSPORT_COMPLETE_QF_OK
:
4408 transport_complete_qf(cmd
);
4411 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4412 "i_state: %d on SE LUN: %u\n",
4414 cmd
->se_tfo
->get_task_tag(cmd
),
4415 cmd
->se_tfo
->get_cmd_state(cmd
),
4416 cmd
->se_lun
->unpacked_lun
);
4424 WARN_ON(!list_empty(&dev
->state_list
));
4425 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4426 dev
->process_thread
= NULL
;