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 <asm/unaligned.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_cmnd.h>
45 #include <scsi/scsi_tcq.h>
47 #include <target/target_core_base.h>
48 #include <target/target_core_backend.h>
49 #include <target/target_core_fabric.h>
50 #include <target/target_core_configfs.h>
52 #include "target_core_internal.h"
53 #include "target_core_alua.h"
54 #include "target_core_pr.h"
55 #include "target_core_ua.h"
57 static int sub_api_initialized
;
59 static struct workqueue_struct
*target_completion_wq
;
60 static struct kmem_cache
*se_sess_cache
;
61 struct kmem_cache
*se_tmr_req_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
);
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 void transport_free_dev_tasks(struct se_cmd
*cmd
);
76 static int transport_generic_get_mem(struct se_cmd
*cmd
);
77 static void transport_put_cmd(struct se_cmd
*cmd
);
78 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
);
79 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
80 static void transport_generic_request_failure(struct se_cmd
*);
81 static void target_complete_ok_work(struct work_struct
*work
);
83 int init_se_kmem_caches(void)
85 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
86 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
88 if (!se_tmr_req_cache
) {
89 pr_err("kmem_cache_create() for struct se_tmr_req"
93 se_sess_cache
= kmem_cache_create("se_sess_cache",
94 sizeof(struct se_session
), __alignof__(struct se_session
),
97 pr_err("kmem_cache_create() for struct se_session"
99 goto out_free_tmr_req_cache
;
101 se_ua_cache
= kmem_cache_create("se_ua_cache",
102 sizeof(struct se_ua
), __alignof__(struct se_ua
),
105 pr_err("kmem_cache_create() for struct se_ua failed\n");
106 goto out_free_sess_cache
;
108 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
109 sizeof(struct t10_pr_registration
),
110 __alignof__(struct t10_pr_registration
), 0, NULL
);
111 if (!t10_pr_reg_cache
) {
112 pr_err("kmem_cache_create() for struct t10_pr_registration"
114 goto out_free_ua_cache
;
116 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
117 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
119 if (!t10_alua_lu_gp_cache
) {
120 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
122 goto out_free_pr_reg_cache
;
124 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
125 sizeof(struct t10_alua_lu_gp_member
),
126 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
127 if (!t10_alua_lu_gp_mem_cache
) {
128 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
130 goto out_free_lu_gp_cache
;
132 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
133 sizeof(struct t10_alua_tg_pt_gp
),
134 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
135 if (!t10_alua_tg_pt_gp_cache
) {
136 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
138 goto out_free_lu_gp_mem_cache
;
140 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
141 "t10_alua_tg_pt_gp_mem_cache",
142 sizeof(struct t10_alua_tg_pt_gp_member
),
143 __alignof__(struct t10_alua_tg_pt_gp_member
),
145 if (!t10_alua_tg_pt_gp_mem_cache
) {
146 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
148 goto out_free_tg_pt_gp_cache
;
151 target_completion_wq
= alloc_workqueue("target_completion",
153 if (!target_completion_wq
)
154 goto out_free_tg_pt_gp_mem_cache
;
158 out_free_tg_pt_gp_mem_cache
:
159 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
160 out_free_tg_pt_gp_cache
:
161 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
162 out_free_lu_gp_mem_cache
:
163 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
164 out_free_lu_gp_cache
:
165 kmem_cache_destroy(t10_alua_lu_gp_cache
);
166 out_free_pr_reg_cache
:
167 kmem_cache_destroy(t10_pr_reg_cache
);
169 kmem_cache_destroy(se_ua_cache
);
171 kmem_cache_destroy(se_sess_cache
);
172 out_free_tmr_req_cache
:
173 kmem_cache_destroy(se_tmr_req_cache
);
178 void release_se_kmem_caches(void)
180 destroy_workqueue(target_completion_wq
);
181 kmem_cache_destroy(se_tmr_req_cache
);
182 kmem_cache_destroy(se_sess_cache
);
183 kmem_cache_destroy(se_ua_cache
);
184 kmem_cache_destroy(t10_pr_reg_cache
);
185 kmem_cache_destroy(t10_alua_lu_gp_cache
);
186 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
187 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
188 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
191 /* This code ensures unique mib indexes are handed out. */
192 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
193 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
196 * Allocate a new row index for the entry type specified
198 u32
scsi_get_new_index(scsi_index_t type
)
202 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
204 spin_lock(&scsi_mib_index_lock
);
205 new_index
= ++scsi_mib_index
[type
];
206 spin_unlock(&scsi_mib_index_lock
);
211 static void transport_init_queue_obj(struct se_queue_obj
*qobj
)
213 atomic_set(&qobj
->queue_cnt
, 0);
214 INIT_LIST_HEAD(&qobj
->qobj_list
);
215 init_waitqueue_head(&qobj
->thread_wq
);
216 spin_lock_init(&qobj
->cmd_queue_lock
);
219 void transport_subsystem_check_init(void)
223 if (sub_api_initialized
)
226 ret
= request_module("target_core_iblock");
228 pr_err("Unable to load target_core_iblock\n");
230 ret
= request_module("target_core_file");
232 pr_err("Unable to load target_core_file\n");
234 ret
= request_module("target_core_pscsi");
236 pr_err("Unable to load target_core_pscsi\n");
238 ret
= request_module("target_core_stgt");
240 pr_err("Unable to load target_core_stgt\n");
242 sub_api_initialized
= 1;
246 struct se_session
*transport_init_session(void)
248 struct se_session
*se_sess
;
250 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
252 pr_err("Unable to allocate struct se_session from"
254 return ERR_PTR(-ENOMEM
);
256 INIT_LIST_HEAD(&se_sess
->sess_list
);
257 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
258 INIT_LIST_HEAD(&se_sess
->sess_cmd_list
);
259 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
260 spin_lock_init(&se_sess
->sess_cmd_lock
);
264 EXPORT_SYMBOL(transport_init_session
);
267 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
269 void __transport_register_session(
270 struct se_portal_group
*se_tpg
,
271 struct se_node_acl
*se_nacl
,
272 struct se_session
*se_sess
,
273 void *fabric_sess_ptr
)
275 unsigned char buf
[PR_REG_ISID_LEN
];
277 se_sess
->se_tpg
= se_tpg
;
278 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
280 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
282 * Only set for struct se_session's that will actually be moving I/O.
283 * eg: *NOT* discovery sessions.
287 * If the fabric module supports an ISID based TransportID,
288 * save this value in binary from the fabric I_T Nexus now.
290 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
291 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
292 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
293 &buf
[0], PR_REG_ISID_LEN
);
294 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
296 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
298 * The se_nacl->nacl_sess pointer will be set to the
299 * last active I_T Nexus for each struct se_node_acl.
301 se_nacl
->nacl_sess
= se_sess
;
303 list_add_tail(&se_sess
->sess_acl_list
,
304 &se_nacl
->acl_sess_list
);
305 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
307 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
309 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
310 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
312 EXPORT_SYMBOL(__transport_register_session
);
314 void transport_register_session(
315 struct se_portal_group
*se_tpg
,
316 struct se_node_acl
*se_nacl
,
317 struct se_session
*se_sess
,
318 void *fabric_sess_ptr
)
320 spin_lock_bh(&se_tpg
->session_lock
);
321 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
322 spin_unlock_bh(&se_tpg
->session_lock
);
324 EXPORT_SYMBOL(transport_register_session
);
326 void transport_deregister_session_configfs(struct se_session
*se_sess
)
328 struct se_node_acl
*se_nacl
;
331 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
333 se_nacl
= se_sess
->se_node_acl
;
335 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
336 list_del(&se_sess
->sess_acl_list
);
338 * If the session list is empty, then clear the pointer.
339 * Otherwise, set the struct se_session pointer from the tail
340 * element of the per struct se_node_acl active session list.
342 if (list_empty(&se_nacl
->acl_sess_list
))
343 se_nacl
->nacl_sess
= NULL
;
345 se_nacl
->nacl_sess
= container_of(
346 se_nacl
->acl_sess_list
.prev
,
347 struct se_session
, sess_acl_list
);
349 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
352 EXPORT_SYMBOL(transport_deregister_session_configfs
);
354 void transport_free_session(struct se_session
*se_sess
)
356 kmem_cache_free(se_sess_cache
, se_sess
);
358 EXPORT_SYMBOL(transport_free_session
);
360 void transport_deregister_session(struct se_session
*se_sess
)
362 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
363 struct se_node_acl
*se_nacl
;
367 transport_free_session(se_sess
);
371 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
372 list_del(&se_sess
->sess_list
);
373 se_sess
->se_tpg
= NULL
;
374 se_sess
->fabric_sess_ptr
= NULL
;
375 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
378 * Determine if we need to do extra work for this initiator node's
379 * struct se_node_acl if it had been previously dynamically generated.
381 se_nacl
= se_sess
->se_node_acl
;
383 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
384 if (se_nacl
->dynamic_node_acl
) {
385 if (!se_tpg
->se_tpg_tfo
->tpg_check_demo_mode_cache(
387 list_del(&se_nacl
->acl_list
);
388 se_tpg
->num_node_acls
--;
389 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
391 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
392 core_free_device_list_for_node(se_nacl
, se_tpg
);
393 se_tpg
->se_tpg_tfo
->tpg_release_fabric_acl(se_tpg
,
395 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
398 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
401 transport_free_session(se_sess
);
403 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
404 se_tpg
->se_tpg_tfo
->get_fabric_name());
406 EXPORT_SYMBOL(transport_deregister_session
);
409 * Called with cmd->t_state_lock held.
411 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
413 struct se_device
*dev
= cmd
->se_dev
;
414 struct se_task
*task
;
420 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
421 if (task
->task_flags
& TF_ACTIVE
)
424 if (!atomic_read(&task
->task_state_active
))
427 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
428 list_del(&task
->t_state_list
);
429 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
430 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
431 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
433 atomic_set(&task
->task_state_active
, 0);
434 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
438 /* transport_cmd_check_stop():
440 * 'transport_off = 1' determines if t_transport_active should be cleared.
441 * 'transport_off = 2' determines if task_dev_state should be removed.
443 * A non-zero u8 t_state sets cmd->t_state.
444 * Returns 1 when command is stopped, else 0.
446 static int transport_cmd_check_stop(
453 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
455 * Determine if IOCTL context caller in requesting the stopping of this
456 * command for LUN shutdown purposes.
458 if (atomic_read(&cmd
->transport_lun_stop
)) {
459 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
460 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
461 cmd
->se_tfo
->get_task_tag(cmd
));
463 atomic_set(&cmd
->t_transport_active
, 0);
464 if (transport_off
== 2)
465 transport_all_task_dev_remove_state(cmd
);
466 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
468 complete(&cmd
->transport_lun_stop_comp
);
472 * Determine if frontend context caller is requesting the stopping of
473 * this command for frontend exceptions.
475 if (atomic_read(&cmd
->t_transport_stop
)) {
476 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
477 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
478 cmd
->se_tfo
->get_task_tag(cmd
));
480 if (transport_off
== 2)
481 transport_all_task_dev_remove_state(cmd
);
484 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
487 if (transport_off
== 2)
489 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
491 complete(&cmd
->t_transport_stop_comp
);
495 atomic_set(&cmd
->t_transport_active
, 0);
496 if (transport_off
== 2) {
497 transport_all_task_dev_remove_state(cmd
);
499 * Clear struct se_cmd->se_lun before the transport_off == 2
500 * handoff to fabric module.
504 * Some fabric modules like tcm_loop can release
505 * their internally allocated I/O reference now and
508 * Fabric modules are expected to return '1' here if the
509 * se_cmd being passed is released at this point,
510 * or zero if not being released.
512 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
513 spin_unlock_irqrestore(
514 &cmd
->t_state_lock
, flags
);
516 return cmd
->se_tfo
->check_stop_free(cmd
);
519 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
523 cmd
->t_state
= t_state
;
524 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
529 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
531 return transport_cmd_check_stop(cmd
, 2, 0);
534 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
536 struct se_lun
*lun
= cmd
->se_lun
;
542 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
543 if (!atomic_read(&cmd
->transport_dev_active
)) {
544 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
547 atomic_set(&cmd
->transport_dev_active
, 0);
548 transport_all_task_dev_remove_state(cmd
);
549 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
553 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
554 if (atomic_read(&cmd
->transport_lun_active
)) {
555 list_del(&cmd
->se_lun_node
);
556 atomic_set(&cmd
->transport_lun_active
, 0);
558 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
559 cmd
->se_tfo
->get_task_tag(cmd
), lun
->unpacked_lun
);
562 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
565 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
567 if (!cmd
->se_tmr_req
)
568 transport_lun_remove_cmd(cmd
);
570 if (transport_cmd_check_stop_to_fabric(cmd
))
573 transport_remove_cmd_from_queue(cmd
);
574 transport_put_cmd(cmd
);
578 static void transport_add_cmd_to_queue(struct se_cmd
*cmd
, int t_state
,
581 struct se_device
*dev
= cmd
->se_dev
;
582 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
586 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
587 cmd
->t_state
= t_state
;
588 atomic_set(&cmd
->t_transport_active
, 1);
589 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
592 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
594 /* If the cmd is already on the list, remove it before we add it */
595 if (!list_empty(&cmd
->se_queue_node
))
596 list_del(&cmd
->se_queue_node
);
598 atomic_inc(&qobj
->queue_cnt
);
601 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
603 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
604 atomic_set(&cmd
->t_transport_queue_active
, 1);
605 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
607 wake_up_interruptible(&qobj
->thread_wq
);
610 static struct se_cmd
*
611 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
616 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
617 if (list_empty(&qobj
->qobj_list
)) {
618 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
621 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
623 atomic_set(&cmd
->t_transport_queue_active
, 0);
625 list_del_init(&cmd
->se_queue_node
);
626 atomic_dec(&qobj
->queue_cnt
);
627 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
632 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
)
634 struct se_queue_obj
*qobj
= &cmd
->se_dev
->dev_queue_obj
;
637 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
638 if (!atomic_read(&cmd
->t_transport_queue_active
)) {
639 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
642 atomic_set(&cmd
->t_transport_queue_active
, 0);
643 atomic_dec(&qobj
->queue_cnt
);
644 list_del_init(&cmd
->se_queue_node
);
645 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
647 if (atomic_read(&cmd
->t_transport_queue_active
)) {
648 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
649 cmd
->se_tfo
->get_task_tag(cmd
),
650 atomic_read(&cmd
->t_transport_queue_active
));
655 * Completion function used by TCM subsystem plugins (such as FILEIO)
656 * for queueing up response from struct se_subsystem_api->do_task()
658 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
660 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
661 struct se_task
, t_list
);
664 cmd
->scsi_status
= SAM_STAT_GOOD
;
665 task
->task_scsi_status
= GOOD
;
667 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
668 task
->task_se_cmd
->scsi_sense_reason
=
669 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
673 transport_complete_task(task
, good
);
675 EXPORT_SYMBOL(transport_complete_sync_cache
);
677 static void target_complete_failure_work(struct work_struct
*work
)
679 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
681 transport_generic_request_failure(cmd
);
684 /* transport_complete_task():
686 * Called from interrupt and non interrupt context depending
687 * on the transport plugin.
689 void transport_complete_task(struct se_task
*task
, int success
)
691 struct se_cmd
*cmd
= task
->task_se_cmd
;
692 struct se_device
*dev
= cmd
->se_dev
;
695 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
696 cmd
->t_task_cdb
[0], dev
);
699 atomic_inc(&dev
->depth_left
);
701 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
702 task
->task_flags
&= ~TF_ACTIVE
;
705 * See if any sense data exists, if so set the TASK_SENSE flag.
706 * Also check for any other post completion work that needs to be
707 * done by the plugins.
709 if (dev
&& dev
->transport
->transport_complete
) {
710 if (dev
->transport
->transport_complete(task
) != 0) {
711 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
712 task
->task_sense
= 1;
718 * See if we are waiting for outstanding struct se_task
719 * to complete for an exception condition
721 if (task
->task_flags
& TF_REQUEST_STOP
) {
722 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
723 complete(&task
->task_stop_comp
);
728 cmd
->t_tasks_failed
= 1;
731 * Decrement the outstanding t_task_cdbs_left count. The last
732 * struct se_task from struct se_cmd will complete itself into the
733 * device queue depending upon int success.
735 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
736 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
740 if (cmd
->t_tasks_failed
) {
741 if (!task
->task_error_status
) {
742 task
->task_error_status
=
743 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
744 cmd
->scsi_sense_reason
=
745 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
748 INIT_WORK(&cmd
->work
, target_complete_failure_work
);
750 atomic_set(&cmd
->t_transport_complete
, 1);
751 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
754 cmd
->t_state
= TRANSPORT_COMPLETE
;
755 atomic_set(&cmd
->t_transport_active
, 1);
756 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
758 queue_work(target_completion_wq
, &cmd
->work
);
760 EXPORT_SYMBOL(transport_complete_task
);
763 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
764 * struct se_task list are ready to be added to the active execution list
767 * Called with se_dev_t->execute_task_lock called.
769 static inline int transport_add_task_check_sam_attr(
770 struct se_task
*task
,
771 struct se_task
*task_prev
,
772 struct se_device
*dev
)
775 * No SAM Task attribute emulation enabled, add to tail of
778 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
779 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
783 * HEAD_OF_QUEUE attribute for received CDB, which means
784 * the first task that is associated with a struct se_cmd goes to
785 * head of the struct se_device->execute_task_list, and task_prev
786 * after that for each subsequent task
788 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
789 list_add(&task
->t_execute_list
,
790 (task_prev
!= NULL
) ?
791 &task_prev
->t_execute_list
:
792 &dev
->execute_task_list
);
794 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
795 " in execution queue\n",
796 task
->task_se_cmd
->t_task_cdb
[0]);
800 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
801 * transitioned from Dermant -> Active state, and are added to the end
802 * of the struct se_device->execute_task_list
804 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
808 /* __transport_add_task_to_execute_queue():
810 * Called with se_dev_t->execute_task_lock called.
812 static void __transport_add_task_to_execute_queue(
813 struct se_task
*task
,
814 struct se_task
*task_prev
,
815 struct se_device
*dev
)
819 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
820 atomic_inc(&dev
->execute_tasks
);
822 if (atomic_read(&task
->task_state_active
))
825 * Determine if this task needs to go to HEAD_OF_QUEUE for the
826 * state list as well. Running with SAM Task Attribute emulation
827 * will always return head_of_queue == 0 here
830 list_add(&task
->t_state_list
, (task_prev
) ?
831 &task_prev
->t_state_list
:
832 &dev
->state_task_list
);
834 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
836 atomic_set(&task
->task_state_active
, 1);
838 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
839 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
843 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
845 struct se_device
*dev
= cmd
->se_dev
;
846 struct se_task
*task
;
849 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
850 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
851 if (atomic_read(&task
->task_state_active
))
854 spin_lock(&dev
->execute_task_lock
);
855 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
856 atomic_set(&task
->task_state_active
, 1);
858 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
859 task
->task_se_cmd
->se_tfo
->get_task_tag(
860 task
->task_se_cmd
), task
, dev
);
862 spin_unlock(&dev
->execute_task_lock
);
864 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
867 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
869 struct se_device
*dev
= cmd
->se_dev
;
870 struct se_task
*task
, *task_prev
= NULL
;
873 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
874 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
875 if (!list_empty(&task
->t_execute_list
))
878 * __transport_add_task_to_execute_queue() handles the
879 * SAM Task Attribute emulation if enabled
881 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
884 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
887 void __transport_remove_task_from_execute_queue(struct se_task
*task
,
888 struct se_device
*dev
)
890 list_del_init(&task
->t_execute_list
);
891 atomic_dec(&dev
->execute_tasks
);
894 static void transport_remove_task_from_execute_queue(
895 struct se_task
*task
,
896 struct se_device
*dev
)
900 if (WARN_ON(list_empty(&task
->t_execute_list
)))
903 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
904 __transport_remove_task_from_execute_queue(task
, dev
);
905 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
909 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
912 static void target_qf_do_work(struct work_struct
*work
)
914 struct se_device
*dev
= container_of(work
, struct se_device
,
916 LIST_HEAD(qf_cmd_list
);
917 struct se_cmd
*cmd
, *cmd_tmp
;
919 spin_lock_irq(&dev
->qf_cmd_lock
);
920 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
921 spin_unlock_irq(&dev
->qf_cmd_lock
);
923 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
924 list_del(&cmd
->se_qf_node
);
925 atomic_dec(&dev
->dev_qf_count
);
926 smp_mb__after_atomic_dec();
928 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
929 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
930 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_OK
) ? "COMPLETE_OK" :
931 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
934 transport_add_cmd_to_queue(cmd
, cmd
->t_state
, true);
938 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
940 switch (cmd
->data_direction
) {
943 case DMA_FROM_DEVICE
:
947 case DMA_BIDIRECTIONAL
:
956 void transport_dump_dev_state(
957 struct se_device
*dev
,
961 *bl
+= sprintf(b
+ *bl
, "Status: ");
962 switch (dev
->dev_status
) {
963 case TRANSPORT_DEVICE_ACTIVATED
:
964 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
966 case TRANSPORT_DEVICE_DEACTIVATED
:
967 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
969 case TRANSPORT_DEVICE_SHUTDOWN
:
970 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
972 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
973 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
974 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
977 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
981 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
982 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
984 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
985 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
986 *bl
+= sprintf(b
+ *bl
, " ");
989 void transport_dump_vpd_proto_id(
991 unsigned char *p_buf
,
994 unsigned char buf
[VPD_TMP_BUF_SIZE
];
997 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
998 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1000 switch (vpd
->protocol_identifier
) {
1002 sprintf(buf
+len
, "Fibre Channel\n");
1005 sprintf(buf
+len
, "Parallel SCSI\n");
1008 sprintf(buf
+len
, "SSA\n");
1011 sprintf(buf
+len
, "IEEE 1394\n");
1014 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1018 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1021 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1024 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1028 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1031 sprintf(buf
+len
, "Unknown 0x%02x\n",
1032 vpd
->protocol_identifier
);
1037 strncpy(p_buf
, buf
, p_buf_len
);
1039 pr_debug("%s", buf
);
1043 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1046 * Check if the Protocol Identifier Valid (PIV) bit is set..
1048 * from spc3r23.pdf section 7.5.1
1050 if (page_83
[1] & 0x80) {
1051 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1052 vpd
->protocol_identifier_set
= 1;
1053 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1056 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1058 int transport_dump_vpd_assoc(
1059 struct t10_vpd
*vpd
,
1060 unsigned char *p_buf
,
1063 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1067 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1068 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1070 switch (vpd
->association
) {
1072 sprintf(buf
+len
, "addressed logical unit\n");
1075 sprintf(buf
+len
, "target port\n");
1078 sprintf(buf
+len
, "SCSI target device\n");
1081 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1087 strncpy(p_buf
, buf
, p_buf_len
);
1089 pr_debug("%s", buf
);
1094 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1097 * The VPD identification association..
1099 * from spc3r23.pdf Section 7.6.3.1 Table 297
1101 vpd
->association
= (page_83
[1] & 0x30);
1102 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1104 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1106 int transport_dump_vpd_ident_type(
1107 struct t10_vpd
*vpd
,
1108 unsigned char *p_buf
,
1111 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1115 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1116 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1118 switch (vpd
->device_identifier_type
) {
1120 sprintf(buf
+len
, "Vendor specific\n");
1123 sprintf(buf
+len
, "T10 Vendor ID based\n");
1126 sprintf(buf
+len
, "EUI-64 based\n");
1129 sprintf(buf
+len
, "NAA\n");
1132 sprintf(buf
+len
, "Relative target port identifier\n");
1135 sprintf(buf
+len
, "SCSI name string\n");
1138 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1139 vpd
->device_identifier_type
);
1145 if (p_buf_len
< strlen(buf
)+1)
1147 strncpy(p_buf
, buf
, p_buf_len
);
1149 pr_debug("%s", buf
);
1155 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1158 * The VPD identifier type..
1160 * from spc3r23.pdf Section 7.6.3.1 Table 298
1162 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1163 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1165 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1167 int transport_dump_vpd_ident(
1168 struct t10_vpd
*vpd
,
1169 unsigned char *p_buf
,
1172 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1175 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1177 switch (vpd
->device_identifier_code_set
) {
1178 case 0x01: /* Binary */
1179 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1180 &vpd
->device_identifier
[0]);
1182 case 0x02: /* ASCII */
1183 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1184 &vpd
->device_identifier
[0]);
1186 case 0x03: /* UTF-8 */
1187 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1188 &vpd
->device_identifier
[0]);
1191 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1192 " 0x%02x", vpd
->device_identifier_code_set
);
1198 strncpy(p_buf
, buf
, p_buf_len
);
1200 pr_debug("%s", buf
);
1206 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1208 static const char hex_str
[] = "0123456789abcdef";
1209 int j
= 0, i
= 4; /* offset to start of the identifer */
1212 * The VPD Code Set (encoding)
1214 * from spc3r23.pdf Section 7.6.3.1 Table 296
1216 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1217 switch (vpd
->device_identifier_code_set
) {
1218 case 0x01: /* Binary */
1219 vpd
->device_identifier
[j
++] =
1220 hex_str
[vpd
->device_identifier_type
];
1221 while (i
< (4 + page_83
[3])) {
1222 vpd
->device_identifier
[j
++] =
1223 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1224 vpd
->device_identifier
[j
++] =
1225 hex_str
[page_83
[i
] & 0x0f];
1229 case 0x02: /* ASCII */
1230 case 0x03: /* UTF-8 */
1231 while (i
< (4 + page_83
[3]))
1232 vpd
->device_identifier
[j
++] = page_83
[i
++];
1238 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1240 EXPORT_SYMBOL(transport_set_vpd_ident
);
1242 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1245 * If this device is from Target_Core_Mod/pSCSI, disable the
1246 * SAM Task Attribute emulation.
1248 * This is currently not available in upsream Linux/SCSI Target
1249 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1251 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1252 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1256 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1257 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1258 " device\n", dev
->transport
->name
,
1259 dev
->transport
->get_device_rev(dev
));
1262 static void scsi_dump_inquiry(struct se_device
*dev
)
1264 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1267 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1269 pr_debug(" Vendor: ");
1270 for (i
= 0; i
< 8; i
++)
1271 if (wwn
->vendor
[i
] >= 0x20)
1272 pr_debug("%c", wwn
->vendor
[i
]);
1276 pr_debug(" Model: ");
1277 for (i
= 0; i
< 16; i
++)
1278 if (wwn
->model
[i
] >= 0x20)
1279 pr_debug("%c", wwn
->model
[i
]);
1283 pr_debug(" Revision: ");
1284 for (i
= 0; i
< 4; i
++)
1285 if (wwn
->revision
[i
] >= 0x20)
1286 pr_debug("%c", wwn
->revision
[i
]);
1292 device_type
= dev
->transport
->get_device_type(dev
);
1293 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1294 pr_debug(" ANSI SCSI revision: %02x\n",
1295 dev
->transport
->get_device_rev(dev
));
1298 struct se_device
*transport_add_device_to_core_hba(
1300 struct se_subsystem_api
*transport
,
1301 struct se_subsystem_dev
*se_dev
,
1303 void *transport_dev
,
1304 struct se_dev_limits
*dev_limits
,
1305 const char *inquiry_prod
,
1306 const char *inquiry_rev
)
1309 struct se_device
*dev
;
1311 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1313 pr_err("Unable to allocate memory for se_dev_t\n");
1317 transport_init_queue_obj(&dev
->dev_queue_obj
);
1318 dev
->dev_flags
= device_flags
;
1319 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1320 dev
->dev_ptr
= transport_dev
;
1322 dev
->se_sub_dev
= se_dev
;
1323 dev
->transport
= transport
;
1324 INIT_LIST_HEAD(&dev
->dev_list
);
1325 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1326 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1327 INIT_LIST_HEAD(&dev
->execute_task_list
);
1328 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1329 INIT_LIST_HEAD(&dev
->state_task_list
);
1330 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1331 spin_lock_init(&dev
->execute_task_lock
);
1332 spin_lock_init(&dev
->delayed_cmd_lock
);
1333 spin_lock_init(&dev
->dev_reservation_lock
);
1334 spin_lock_init(&dev
->dev_status_lock
);
1335 spin_lock_init(&dev
->se_port_lock
);
1336 spin_lock_init(&dev
->se_tmr_lock
);
1337 spin_lock_init(&dev
->qf_cmd_lock
);
1339 dev
->queue_depth
= dev_limits
->queue_depth
;
1340 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1341 atomic_set(&dev
->dev_ordered_id
, 0);
1343 se_dev_set_default_attribs(dev
, dev_limits
);
1345 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1346 dev
->creation_time
= get_jiffies_64();
1347 spin_lock_init(&dev
->stats_lock
);
1349 spin_lock(&hba
->device_lock
);
1350 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1352 spin_unlock(&hba
->device_lock
);
1354 * Setup the SAM Task Attribute emulation for struct se_device
1356 core_setup_task_attr_emulation(dev
);
1358 * Force PR and ALUA passthrough emulation with internal object use.
1360 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1362 * Setup the Reservations infrastructure for struct se_device
1364 core_setup_reservations(dev
, force_pt
);
1366 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1368 if (core_setup_alua(dev
, force_pt
) < 0)
1372 * Startup the struct se_device processing thread
1374 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1375 "LIO_%s", dev
->transport
->name
);
1376 if (IS_ERR(dev
->process_thread
)) {
1377 pr_err("Unable to create kthread: LIO_%s\n",
1378 dev
->transport
->name
);
1382 * Setup work_queue for QUEUE_FULL
1384 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1386 * Preload the initial INQUIRY const values if we are doing
1387 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1388 * passthrough because this is being provided by the backend LLD.
1389 * This is required so that transport_get_inquiry() copies these
1390 * originals once back into DEV_T10_WWN(dev) for the virtual device
1393 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1394 if (!inquiry_prod
|| !inquiry_rev
) {
1395 pr_err("All non TCM/pSCSI plugins require"
1396 " INQUIRY consts\n");
1400 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1401 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1402 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1404 scsi_dump_inquiry(dev
);
1408 kthread_stop(dev
->process_thread
);
1410 spin_lock(&hba
->device_lock
);
1411 list_del(&dev
->dev_list
);
1413 spin_unlock(&hba
->device_lock
);
1415 se_release_vpd_for_dev(dev
);
1421 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1423 /* transport_generic_prepare_cdb():
1425 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1426 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1427 * The point of this is since we are mapping iSCSI LUNs to
1428 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1429 * devices and HBAs for a loop.
1431 static inline void transport_generic_prepare_cdb(
1435 case READ_10
: /* SBC - RDProtect */
1436 case READ_12
: /* SBC - RDProtect */
1437 case READ_16
: /* SBC - RDProtect */
1438 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1439 case VERIFY
: /* SBC - VRProtect */
1440 case VERIFY_16
: /* SBC - VRProtect */
1441 case WRITE_VERIFY
: /* SBC - VRProtect */
1442 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1445 cdb
[1] &= 0x1f; /* clear logical unit number */
1450 static struct se_task
*
1451 transport_generic_get_task(struct se_cmd
*cmd
,
1452 enum dma_data_direction data_direction
)
1454 struct se_task
*task
;
1455 struct se_device
*dev
= cmd
->se_dev
;
1457 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1459 pr_err("Unable to allocate struct se_task\n");
1463 INIT_LIST_HEAD(&task
->t_list
);
1464 INIT_LIST_HEAD(&task
->t_execute_list
);
1465 INIT_LIST_HEAD(&task
->t_state_list
);
1466 init_completion(&task
->task_stop_comp
);
1467 task
->task_se_cmd
= cmd
;
1468 task
->task_data_direction
= data_direction
;
1473 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1476 * Used by fabric modules containing a local struct se_cmd within their
1477 * fabric dependent per I/O descriptor.
1479 void transport_init_se_cmd(
1481 struct target_core_fabric_ops
*tfo
,
1482 struct se_session
*se_sess
,
1486 unsigned char *sense_buffer
)
1488 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1489 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1490 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1491 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1492 INIT_LIST_HEAD(&cmd
->se_cmd_list
);
1493 INIT_LIST_HEAD(&cmd
->t_task_list
);
1494 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1495 init_completion(&cmd
->transport_lun_stop_comp
);
1496 init_completion(&cmd
->t_transport_stop_comp
);
1497 init_completion(&cmd
->cmd_wait_comp
);
1498 spin_lock_init(&cmd
->t_state_lock
);
1499 atomic_set(&cmd
->transport_dev_active
, 1);
1502 cmd
->se_sess
= se_sess
;
1503 cmd
->data_length
= data_length
;
1504 cmd
->data_direction
= data_direction
;
1505 cmd
->sam_task_attr
= task_attr
;
1506 cmd
->sense_buffer
= sense_buffer
;
1508 EXPORT_SYMBOL(transport_init_se_cmd
);
1510 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1513 * Check if SAM Task Attribute emulation is enabled for this
1514 * struct se_device storage object
1516 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1519 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1520 pr_debug("SAM Task Attribute ACA"
1521 " emulation is not supported\n");
1525 * Used to determine when ORDERED commands should go from
1526 * Dormant to Active status.
1528 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1529 smp_mb__after_atomic_inc();
1530 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1531 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1532 cmd
->se_dev
->transport
->name
);
1536 /* transport_generic_allocate_tasks():
1538 * Called from fabric RX Thread.
1540 int transport_generic_allocate_tasks(
1546 transport_generic_prepare_cdb(cdb
);
1548 * Ensure that the received CDB is less than the max (252 + 8) bytes
1549 * for VARIABLE_LENGTH_CMD
1551 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1552 pr_err("Received SCSI CDB with command_size: %d that"
1553 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1554 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1555 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1556 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1560 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1561 * allocate the additional extended CDB buffer now.. Otherwise
1562 * setup the pointer from __t_task_cdb to t_task_cdb.
1564 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1565 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1567 if (!cmd
->t_task_cdb
) {
1568 pr_err("Unable to allocate cmd->t_task_cdb"
1569 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1570 scsi_command_size(cdb
),
1571 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1572 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1573 cmd
->scsi_sense_reason
=
1574 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1578 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1580 * Copy the original CDB into cmd->
1582 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1584 * Setup the received CDB based on SCSI defined opcodes and
1585 * perform unit attention, persistent reservations and ALUA
1586 * checks for virtual device backends. The cmd->t_task_cdb
1587 * pointer is expected to be setup before we reach this point.
1589 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1593 * Check for SAM Task Attribute Emulation
1595 if (transport_check_alloc_task_attr(cmd
) < 0) {
1596 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1597 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1600 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1601 if (cmd
->se_lun
->lun_sep
)
1602 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1603 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1606 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1609 * Used by fabric module frontends to queue tasks directly.
1610 * Many only be used from process context only
1612 int transport_handle_cdb_direct(
1619 pr_err("cmd->se_lun is NULL\n");
1622 if (in_interrupt()) {
1624 pr_err("transport_generic_handle_cdb cannot be called"
1625 " from interrupt context\n");
1629 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1630 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1631 * in existing usage to ensure that outstanding descriptors are handled
1632 * correctly during shutdown via transport_wait_for_tasks()
1634 * Also, we don't take cmd->t_state_lock here as we only expect
1635 * this to be called for initial descriptor submission.
1637 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1638 atomic_set(&cmd
->t_transport_active
, 1);
1640 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1641 * so follow TRANSPORT_NEW_CMD processing thread context usage
1642 * and call transport_generic_request_failure() if necessary..
1644 ret
= transport_generic_new_cmd(cmd
);
1646 transport_generic_request_failure(cmd
);
1650 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1653 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1654 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1655 * complete setup in TCM process context w/ TFO->new_cmd_map().
1657 int transport_generic_handle_cdb_map(
1662 pr_err("cmd->se_lun is NULL\n");
1666 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
, false);
1669 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1671 /* transport_generic_handle_data():
1675 int transport_generic_handle_data(
1679 * For the software fabric case, then we assume the nexus is being
1680 * failed/shutdown when signals are pending from the kthread context
1681 * caller, so we return a failure. For the HW target mode case running
1682 * in interrupt code, the signal_pending() check is skipped.
1684 if (!in_interrupt() && signal_pending(current
))
1687 * If the received CDB has aleady been ABORTED by the generic
1688 * target engine, we now call transport_check_aborted_status()
1689 * to queue any delated TASK_ABORTED status for the received CDB to the
1690 * fabric module as we are expecting no further incoming DATA OUT
1691 * sequences at this point.
1693 if (transport_check_aborted_status(cmd
, 1) != 0)
1696 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
, false);
1699 EXPORT_SYMBOL(transport_generic_handle_data
);
1701 /* transport_generic_handle_tmr():
1705 int transport_generic_handle_tmr(
1708 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
, false);
1711 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1714 * If the task is active, request it to be stopped and sleep until it
1717 bool target_stop_task(struct se_task
*task
, unsigned long *flags
)
1719 struct se_cmd
*cmd
= task
->task_se_cmd
;
1720 bool was_active
= false;
1722 if (task
->task_flags
& TF_ACTIVE
) {
1723 task
->task_flags
|= TF_REQUEST_STOP
;
1724 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
1726 pr_debug("Task %p waiting to complete\n", task
);
1727 wait_for_completion(&task
->task_stop_comp
);
1728 pr_debug("Task %p stopped successfully\n", task
);
1730 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
1731 atomic_dec(&cmd
->t_task_cdbs_left
);
1732 task
->task_flags
&= ~(TF_ACTIVE
| TF_REQUEST_STOP
);
1739 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1741 struct se_task
*task
, *task_tmp
;
1742 unsigned long flags
;
1745 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1746 cmd
->se_tfo
->get_task_tag(cmd
));
1749 * No tasks remain in the execution queue
1751 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1752 list_for_each_entry_safe(task
, task_tmp
,
1753 &cmd
->t_task_list
, t_list
) {
1754 pr_debug("Processing task %p\n", task
);
1756 * If the struct se_task has not been sent and is not active,
1757 * remove the struct se_task from the execution queue.
1759 if (!(task
->task_flags
& (TF_ACTIVE
| TF_SENT
))) {
1760 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1762 transport_remove_task_from_execute_queue(task
,
1765 pr_debug("Task %p removed from execute queue\n", task
);
1766 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1770 if (!target_stop_task(task
, &flags
)) {
1771 pr_debug("Task %p - did nothing\n", task
);
1775 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1781 * Handle SAM-esque emulation for generic transport request failures.
1783 static void transport_generic_request_failure(struct se_cmd
*cmd
)
1787 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1788 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1789 cmd
->t_task_cdb
[0]);
1790 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1791 cmd
->se_tfo
->get_cmd_state(cmd
),
1792 cmd
->t_state
, cmd
->scsi_sense_reason
);
1793 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1794 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1795 " t_transport_active: %d t_transport_stop: %d"
1796 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1797 atomic_read(&cmd
->t_task_cdbs_left
),
1798 atomic_read(&cmd
->t_task_cdbs_sent
),
1799 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1800 atomic_read(&cmd
->t_transport_active
),
1801 atomic_read(&cmd
->t_transport_stop
),
1802 atomic_read(&cmd
->t_transport_sent
));
1805 * For SAM Task Attribute emulation for failed struct se_cmd
1807 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1808 transport_complete_task_attr(cmd
);
1810 switch (cmd
->scsi_sense_reason
) {
1811 case TCM_NON_EXISTENT_LUN
:
1812 case TCM_UNSUPPORTED_SCSI_OPCODE
:
1813 case TCM_INVALID_CDB_FIELD
:
1814 case TCM_INVALID_PARAMETER_LIST
:
1815 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
1816 case TCM_UNKNOWN_MODE_PAGE
:
1817 case TCM_WRITE_PROTECTED
:
1818 case TCM_CHECK_CONDITION_ABORT_CMD
:
1819 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
1820 case TCM_CHECK_CONDITION_NOT_READY
:
1822 case TCM_RESERVATION_CONFLICT
:
1824 * No SENSE Data payload for this case, set SCSI Status
1825 * and queue the response to $FABRIC_MOD.
1827 * Uses linux/include/scsi/scsi.h SAM status codes defs
1829 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1831 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1832 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1835 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1838 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1839 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1840 cmd
->orig_fe_lun
, 0x2C,
1841 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1843 ret
= cmd
->se_tfo
->queue_status(cmd
);
1844 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1848 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1849 cmd
->t_task_cdb
[0], cmd
->scsi_sense_reason
);
1850 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1854 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1855 * make the call to transport_send_check_condition_and_sense()
1856 * directly. Otherwise expect the fabric to make the call to
1857 * transport_send_check_condition_and_sense() after handling
1858 * possible unsoliticied write data payloads.
1860 ret
= transport_send_check_condition_and_sense(cmd
,
1861 cmd
->scsi_sense_reason
, 0);
1862 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
1866 transport_lun_remove_cmd(cmd
);
1867 if (!transport_cmd_check_stop_to_fabric(cmd
))
1872 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
1873 transport_handle_queue_full(cmd
, cmd
->se_dev
);
1876 static inline u32
transport_lba_21(unsigned char *cdb
)
1878 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
1881 static inline u32
transport_lba_32(unsigned char *cdb
)
1883 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1886 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
1888 unsigned int __v1
, __v2
;
1890 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
1891 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
1893 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1897 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1899 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
1901 unsigned int __v1
, __v2
;
1903 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
1904 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
1906 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
1909 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
1911 unsigned long flags
;
1913 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
1914 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
1915 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
1918 static inline int transport_tcq_window_closed(struct se_device
*dev
)
1920 if (dev
->dev_tcq_window_closed
++ <
1921 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
1922 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
1924 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
1926 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
1931 * Called from Fabric Module context from transport_execute_tasks()
1933 * The return of this function determins if the tasks from struct se_cmd
1934 * get added to the execution queue in transport_execute_tasks(),
1935 * or are added to the delayed or ordered lists here.
1937 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
1939 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1942 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1943 * to allow the passed struct se_cmd list of tasks to the front of the list.
1945 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
1946 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1947 " 0x%02x, se_ordered_id: %u\n",
1949 cmd
->se_ordered_id
);
1951 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
1952 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
1953 smp_mb__after_atomic_inc();
1955 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1956 " list, se_ordered_id: %u\n",
1958 cmd
->se_ordered_id
);
1960 * Add ORDERED command to tail of execution queue if
1961 * no other older commands exist that need to be
1964 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
1968 * For SIMPLE and UNTAGGED Task Attribute commands
1970 atomic_inc(&cmd
->se_dev
->simple_cmds
);
1971 smp_mb__after_atomic_inc();
1974 * Otherwise if one or more outstanding ORDERED task attribute exist,
1975 * add the dormant task(s) built for the passed struct se_cmd to the
1976 * execution queue and become in Active state for this struct se_device.
1978 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
1980 * Otherwise, add cmd w/ tasks to delayed cmd queue that
1981 * will be drained upon completion of HEAD_OF_QUEUE task.
1983 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
1984 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
1985 list_add_tail(&cmd
->se_delayed_node
,
1986 &cmd
->se_dev
->delayed_cmd_list
);
1987 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
1989 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1990 " delayed CMD list, se_ordered_id: %u\n",
1991 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
1992 cmd
->se_ordered_id
);
1994 * Return zero to let transport_execute_tasks() know
1995 * not to add the delayed tasks to the execution list.
2000 * Otherwise, no ORDERED task attributes exist..
2006 * Called from fabric module context in transport_generic_new_cmd() and
2007 * transport_generic_process_write()
2009 static int transport_execute_tasks(struct se_cmd
*cmd
)
2013 if (se_dev_check_online(cmd
->se_dev
) != 0) {
2014 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2015 transport_generic_request_failure(cmd
);
2020 * Call transport_cmd_check_stop() to see if a fabric exception
2021 * has occurred that prevents execution.
2023 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2025 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2026 * attribute for the tasks of the received struct se_cmd CDB
2028 add_tasks
= transport_execute_task_attr(cmd
);
2032 * This calls transport_add_tasks_from_cmd() to handle
2033 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2034 * (if enabled) in __transport_add_task_to_execute_queue() and
2035 * transport_add_task_check_sam_attr().
2037 transport_add_tasks_from_cmd(cmd
);
2040 * Kick the execution queue for the cmd associated struct se_device
2044 __transport_execute_tasks(cmd
->se_dev
);
2049 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2050 * from struct se_device->execute_task_list and
2052 * Called from transport_processing_thread()
2054 static int __transport_execute_tasks(struct se_device
*dev
)
2057 struct se_cmd
*cmd
= NULL
;
2058 struct se_task
*task
= NULL
;
2059 unsigned long flags
;
2062 * Check if there is enough room in the device and HBA queue to send
2063 * struct se_tasks to the selected transport.
2066 if (!atomic_read(&dev
->depth_left
))
2067 return transport_tcq_window_closed(dev
);
2069 dev
->dev_tcq_window_closed
= 0;
2071 spin_lock_irq(&dev
->execute_task_lock
);
2072 if (list_empty(&dev
->execute_task_list
)) {
2073 spin_unlock_irq(&dev
->execute_task_lock
);
2076 task
= list_first_entry(&dev
->execute_task_list
,
2077 struct se_task
, t_execute_list
);
2078 __transport_remove_task_from_execute_queue(task
, dev
);
2079 spin_unlock_irq(&dev
->execute_task_lock
);
2081 atomic_dec(&dev
->depth_left
);
2083 cmd
= task
->task_se_cmd
;
2085 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2086 task
->task_flags
|= (TF_ACTIVE
| TF_SENT
);
2087 atomic_inc(&cmd
->t_task_cdbs_sent
);
2089 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2090 cmd
->t_task_list_num
)
2091 atomic_set(&cmd
->t_transport_sent
, 1);
2093 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2095 if (cmd
->execute_task
)
2096 error
= cmd
->execute_task(task
);
2098 error
= dev
->transport
->do_task(task
);
2100 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2101 task
->task_flags
&= ~TF_ACTIVE
;
2102 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2103 atomic_set(&cmd
->t_transport_sent
, 0);
2104 transport_stop_tasks_for_cmd(cmd
);
2105 atomic_inc(&dev
->depth_left
);
2106 transport_generic_request_failure(cmd
);
2114 static inline u32
transport_get_sectors_6(
2119 struct se_device
*dev
= cmd
->se_dev
;
2122 * Assume TYPE_DISK for non struct se_device objects.
2123 * Use 8-bit sector value.
2129 * Use 24-bit allocation length for TYPE_TAPE.
2131 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2132 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2135 * Everything else assume TYPE_DISK Sector CDB location.
2136 * Use 8-bit sector value. SBC-3 says:
2138 * A TRANSFER LENGTH field set to zero specifies that 256
2139 * logical blocks shall be written. Any other value
2140 * specifies the number of logical blocks that shall be
2144 return cdb
[4] ? : 256;
2147 static inline u32
transport_get_sectors_10(
2152 struct se_device
*dev
= cmd
->se_dev
;
2155 * Assume TYPE_DISK for non struct se_device objects.
2156 * Use 16-bit sector value.
2162 * XXX_10 is not defined in SSC, throw an exception
2164 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2170 * Everything else assume TYPE_DISK Sector CDB location.
2171 * Use 16-bit sector value.
2174 return (u32
)(cdb
[7] << 8) + cdb
[8];
2177 static inline u32
transport_get_sectors_12(
2182 struct se_device
*dev
= cmd
->se_dev
;
2185 * Assume TYPE_DISK for non struct se_device objects.
2186 * Use 32-bit sector value.
2192 * XXX_12 is not defined in SSC, throw an exception
2194 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2200 * Everything else assume TYPE_DISK Sector CDB location.
2201 * Use 32-bit sector value.
2204 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2207 static inline u32
transport_get_sectors_16(
2212 struct se_device
*dev
= cmd
->se_dev
;
2215 * Assume TYPE_DISK for non struct se_device objects.
2216 * Use 32-bit sector value.
2222 * Use 24-bit allocation length for TYPE_TAPE.
2224 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2225 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2228 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2229 (cdb
[12] << 8) + cdb
[13];
2233 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2235 static inline u32
transport_get_sectors_32(
2241 * Assume TYPE_DISK for non struct se_device objects.
2242 * Use 32-bit sector value.
2244 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2245 (cdb
[30] << 8) + cdb
[31];
2249 static inline u32
transport_get_size(
2254 struct se_device
*dev
= cmd
->se_dev
;
2256 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2257 if (cdb
[1] & 1) { /* sectors */
2258 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2263 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2264 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2265 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2266 dev
->transport
->name
);
2268 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2271 static void transport_xor_callback(struct se_cmd
*cmd
)
2273 unsigned char *buf
, *addr
;
2274 struct scatterlist
*sg
;
2275 unsigned int offset
;
2279 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2281 * 1) read the specified logical block(s);
2282 * 2) transfer logical blocks from the data-out buffer;
2283 * 3) XOR the logical blocks transferred from the data-out buffer with
2284 * the logical blocks read, storing the resulting XOR data in a buffer;
2285 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2286 * blocks transferred from the data-out buffer; and
2287 * 5) transfer the resulting XOR data to the data-in buffer.
2289 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2291 pr_err("Unable to allocate xor_callback buf\n");
2295 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2296 * into the locally allocated *buf
2298 sg_copy_to_buffer(cmd
->t_data_sg
,
2304 * Now perform the XOR against the BIDI read memory located at
2305 * cmd->t_mem_bidi_list
2309 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2310 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2314 for (i
= 0; i
< sg
->length
; i
++)
2315 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2317 offset
+= sg
->length
;
2318 kunmap_atomic(addr
, KM_USER0
);
2326 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2328 static int transport_get_sense_data(struct se_cmd
*cmd
)
2330 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2331 struct se_device
*dev
= cmd
->se_dev
;
2332 struct se_task
*task
= NULL
, *task_tmp
;
2333 unsigned long flags
;
2336 WARN_ON(!cmd
->se_lun
);
2341 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2342 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2343 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2347 list_for_each_entry_safe(task
, task_tmp
,
2348 &cmd
->t_task_list
, t_list
) {
2349 if (!task
->task_sense
)
2352 if (!dev
->transport
->get_sense_buffer
) {
2353 pr_err("dev->transport->get_sense_buffer"
2358 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2359 if (!sense_buffer
) {
2360 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2361 " sense buffer for task with sense\n",
2362 cmd
->se_tfo
->get_task_tag(cmd
), task
);
2365 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2367 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2368 TRANSPORT_SENSE_BUFFER
);
2370 memcpy(&buffer
[offset
], sense_buffer
,
2371 TRANSPORT_SENSE_BUFFER
);
2372 cmd
->scsi_status
= task
->task_scsi_status
;
2373 /* Automatically padded */
2374 cmd
->scsi_sense_length
=
2375 (TRANSPORT_SENSE_BUFFER
+ offset
);
2377 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2379 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2383 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2388 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2390 return dev
->transport
->get_blocks(dev
) + 1;
2393 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2395 struct se_device
*dev
= cmd
->se_dev
;
2398 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2401 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2403 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2404 pr_err("LBA: %llu Sectors: %u exceeds"
2405 " transport_dev_end_lba(): %llu\n",
2406 cmd
->t_task_lba
, sectors
,
2407 transport_dev_end_lba(dev
));
2414 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2417 * Determine if the received WRITE_SAME is used to for direct
2418 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2419 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2420 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2422 int passthrough
= (dev
->transport
->transport_type
==
2423 TRANSPORT_PLUGIN_PHBA_PDEV
);
2426 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2427 pr_err("WRITE_SAME PBDATA and LBDATA"
2428 " bits not supported for Block Discard"
2433 * Currently for the emulated case we only accept
2434 * tpws with the UNMAP=1 bit set.
2436 if (!(flags
[0] & 0x08)) {
2437 pr_err("WRITE_SAME w/o UNMAP bit not"
2438 " supported for Block Discard Emulation\n");
2446 /* transport_generic_cmd_sequencer():
2448 * Generic Command Sequencer that should work for most DAS transport
2451 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2454 * FIXME: Need to support other SCSI OPCODES where as well.
2456 static int transport_generic_cmd_sequencer(
2460 struct se_device
*dev
= cmd
->se_dev
;
2461 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2462 int ret
= 0, sector_ret
= 0, passthrough
;
2463 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2467 * Check for an existing UNIT ATTENTION condition
2469 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2470 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2471 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2475 * Check status of Asymmetric Logical Unit Assignment port
2477 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2480 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2481 * The ALUA additional sense code qualifier (ASCQ) is determined
2482 * by the ALUA primary or secondary access state..
2486 pr_debug("[%s]: ALUA TG Port not available,"
2487 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2488 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2490 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2491 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2492 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2495 goto out_invalid_cdb_field
;
2498 * Check status for SPC-3 Persistent Reservations
2500 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2501 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2502 cmd
, cdb
, pr_reg_type
) != 0) {
2503 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2504 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2505 cmd
->scsi_sense_reason
= TCM_RESERVATION_CONFLICT
;
2509 * This means the CDB is allowed for the SCSI Initiator port
2510 * when said port is *NOT* holding the legacy SPC-2 or
2511 * SPC-3 Persistent Reservation.
2516 * If we operate in passthrough mode we skip most CDB emulation and
2517 * instead hand the commands down to the physical SCSI device.
2520 (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
);
2524 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2526 goto out_unsupported_cdb
;
2527 size
= transport_get_size(sectors
, cdb
, cmd
);
2528 cmd
->t_task_lba
= transport_lba_21(cdb
);
2529 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2532 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2534 goto out_unsupported_cdb
;
2535 size
= transport_get_size(sectors
, cdb
, cmd
);
2536 cmd
->t_task_lba
= transport_lba_32(cdb
);
2537 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2540 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2542 goto out_unsupported_cdb
;
2543 size
= transport_get_size(sectors
, cdb
, cmd
);
2544 cmd
->t_task_lba
= transport_lba_32(cdb
);
2545 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2548 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2550 goto out_unsupported_cdb
;
2551 size
= transport_get_size(sectors
, cdb
, cmd
);
2552 cmd
->t_task_lba
= transport_lba_64(cdb
);
2553 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2556 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2558 goto out_unsupported_cdb
;
2559 size
= transport_get_size(sectors
, cdb
, cmd
);
2560 cmd
->t_task_lba
= transport_lba_21(cdb
);
2561 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2564 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2566 goto out_unsupported_cdb
;
2567 size
= transport_get_size(sectors
, cdb
, cmd
);
2568 cmd
->t_task_lba
= transport_lba_32(cdb
);
2570 cmd
->se_cmd_flags
|= SCF_FUA
;
2571 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2574 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2576 goto out_unsupported_cdb
;
2577 size
= transport_get_size(sectors
, cdb
, cmd
);
2578 cmd
->t_task_lba
= transport_lba_32(cdb
);
2580 cmd
->se_cmd_flags
|= SCF_FUA
;
2581 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2584 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2586 goto out_unsupported_cdb
;
2587 size
= transport_get_size(sectors
, cdb
, cmd
);
2588 cmd
->t_task_lba
= transport_lba_64(cdb
);
2590 cmd
->se_cmd_flags
|= SCF_FUA
;
2591 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2593 case XDWRITEREAD_10
:
2594 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2595 !(cmd
->se_cmd_flags
& SCF_BIDI
))
2596 goto out_invalid_cdb_field
;
2597 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2599 goto out_unsupported_cdb
;
2600 size
= transport_get_size(sectors
, cdb
, cmd
);
2601 cmd
->t_task_lba
= transport_lba_32(cdb
);
2602 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2605 * Do now allow BIDI commands for passthrough mode.
2608 goto out_unsupported_cdb
;
2611 * Setup BIDI XOR callback to be run after I/O completion.
2613 cmd
->transport_complete_callback
= &transport_xor_callback
;
2615 cmd
->se_cmd_flags
|= SCF_FUA
;
2617 case VARIABLE_LENGTH_CMD
:
2618 service_action
= get_unaligned_be16(&cdb
[8]);
2619 switch (service_action
) {
2620 case XDWRITEREAD_32
:
2621 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2623 goto out_unsupported_cdb
;
2624 size
= transport_get_size(sectors
, cdb
, cmd
);
2626 * Use WRITE_32 and READ_32 opcodes for the emulated
2627 * XDWRITE_READ_32 logic.
2629 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2630 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2633 * Do now allow BIDI commands for passthrough mode.
2636 goto out_unsupported_cdb
;
2639 * Setup BIDI XOR callback to be run during after I/O
2642 cmd
->transport_complete_callback
= &transport_xor_callback
;
2644 cmd
->se_cmd_flags
|= SCF_FUA
;
2647 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2649 goto out_unsupported_cdb
;
2652 size
= transport_get_size(1, cdb
, cmd
);
2654 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2656 goto out_invalid_cdb_field
;
2659 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
2660 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2662 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
2663 goto out_invalid_cdb_field
;
2665 cmd
->execute_task
= target_emulate_write_same
;
2668 pr_err("VARIABLE_LENGTH_CMD service action"
2669 " 0x%04x not supported\n", service_action
);
2670 goto out_unsupported_cdb
;
2673 case MAINTENANCE_IN
:
2674 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2675 /* MAINTENANCE_IN from SCC-2 */
2677 * Check for emulated MI_REPORT_TARGET_PGS.
2679 if (cdb
[1] == MI_REPORT_TARGET_PGS
&&
2680 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2682 target_emulate_report_target_port_groups
;
2684 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2685 (cdb
[8] << 8) | cdb
[9];
2687 /* GPCMD_SEND_KEY from multi media commands */
2688 size
= (cdb
[8] << 8) + cdb
[9];
2690 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2694 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2696 case MODE_SELECT_10
:
2697 size
= (cdb
[7] << 8) + cdb
[8];
2698 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2702 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2704 cmd
->execute_task
= target_emulate_modesense
;
2707 size
= (cdb
[7] << 8) + cdb
[8];
2708 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2710 cmd
->execute_task
= target_emulate_modesense
;
2712 case GPCMD_READ_BUFFER_CAPACITY
:
2713 case GPCMD_SEND_OPC
:
2716 size
= (cdb
[7] << 8) + cdb
[8];
2717 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2719 case READ_BLOCK_LIMITS
:
2720 size
= READ_BLOCK_LEN
;
2721 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2723 case GPCMD_GET_CONFIGURATION
:
2724 case GPCMD_READ_FORMAT_CAPACITIES
:
2725 case GPCMD_READ_DISC_INFO
:
2726 case GPCMD_READ_TRACK_RZONE_INFO
:
2727 size
= (cdb
[7] << 8) + cdb
[8];
2728 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2730 case PERSISTENT_RESERVE_IN
:
2731 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2732 cmd
->execute_task
= target_scsi3_emulate_pr_in
;
2733 size
= (cdb
[7] << 8) + cdb
[8];
2734 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2736 case PERSISTENT_RESERVE_OUT
:
2737 if (su_dev
->t10_pr
.res_type
== SPC3_PERSISTENT_RESERVATIONS
)
2738 cmd
->execute_task
= target_scsi3_emulate_pr_out
;
2739 size
= (cdb
[7] << 8) + cdb
[8];
2740 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2742 case GPCMD_MECHANISM_STATUS
:
2743 case GPCMD_READ_DVD_STRUCTURE
:
2744 size
= (cdb
[8] << 8) + cdb
[9];
2745 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2748 size
= READ_POSITION_LEN
;
2749 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2751 case MAINTENANCE_OUT
:
2752 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
2753 /* MAINTENANCE_OUT from SCC-2
2755 * Check for emulated MO_SET_TARGET_PGS.
2757 if (cdb
[1] == MO_SET_TARGET_PGS
&&
2758 su_dev
->t10_alua
.alua_type
== SPC3_ALUA_EMULATED
) {
2760 target_emulate_set_target_port_groups
;
2763 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
2764 (cdb
[8] << 8) | cdb
[9];
2766 /* GPCMD_REPORT_KEY from multi media commands */
2767 size
= (cdb
[8] << 8) + cdb
[9];
2769 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2772 size
= (cdb
[3] << 8) + cdb
[4];
2774 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2775 * See spc4r17 section 5.3
2777 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
2778 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
2779 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2781 cmd
->execute_task
= target_emulate_inquiry
;
2784 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2785 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2788 size
= READ_CAP_LEN
;
2789 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2791 cmd
->execute_task
= target_emulate_readcapacity
;
2793 case READ_MEDIA_SERIAL_NUMBER
:
2794 case SECURITY_PROTOCOL_IN
:
2795 case SECURITY_PROTOCOL_OUT
:
2796 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2797 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2799 case SERVICE_ACTION_IN
:
2800 switch (cmd
->t_task_cdb
[1] & 0x1f) {
2801 case SAI_READ_CAPACITY_16
:
2804 target_emulate_readcapacity_16
;
2810 pr_err("Unsupported SA: 0x%02x\n",
2811 cmd
->t_task_cdb
[1] & 0x1f);
2812 goto out_unsupported_cdb
;
2815 case ACCESS_CONTROL_IN
:
2816 case ACCESS_CONTROL_OUT
:
2818 case READ_ATTRIBUTE
:
2819 case RECEIVE_COPY_RESULTS
:
2820 case WRITE_ATTRIBUTE
:
2821 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
2822 (cdb
[12] << 8) | cdb
[13];
2823 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2825 case RECEIVE_DIAGNOSTIC
:
2826 case SEND_DIAGNOSTIC
:
2827 size
= (cdb
[3] << 8) | cdb
[4];
2828 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2830 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2833 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2834 size
= (2336 * sectors
);
2835 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2840 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2844 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2846 cmd
->execute_task
= target_emulate_request_sense
;
2848 case READ_ELEMENT_STATUS
:
2849 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
2850 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2853 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
2854 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2859 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2860 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2862 if (cdb
[0] == RESERVE_10
)
2863 size
= (cdb
[7] << 8) | cdb
[8];
2865 size
= cmd
->data_length
;
2868 * Setup the legacy emulated handler for SPC-2 and
2869 * >= SPC-3 compatible reservation handling (CRH=1)
2870 * Otherwise, we assume the underlying SCSI logic is
2871 * is running in SPC_PASSTHROUGH, and wants reservations
2872 * emulation disabled.
2874 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2875 cmd
->execute_task
= target_scsi2_reservation_reserve
;
2876 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2881 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2882 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2884 if (cdb
[0] == RELEASE_10
)
2885 size
= (cdb
[7] << 8) | cdb
[8];
2887 size
= cmd
->data_length
;
2889 if (su_dev
->t10_pr
.res_type
!= SPC_PASSTHROUGH
)
2890 cmd
->execute_task
= target_scsi2_reservation_release
;
2891 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2893 case SYNCHRONIZE_CACHE
:
2894 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2896 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2898 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
2899 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2900 cmd
->t_task_lba
= transport_lba_32(cdb
);
2902 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2903 cmd
->t_task_lba
= transport_lba_64(cdb
);
2906 goto out_unsupported_cdb
;
2908 size
= transport_get_size(sectors
, cdb
, cmd
);
2909 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2915 * Check to ensure that LBA + Range does not exceed past end of
2916 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2918 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
2919 if (transport_cmd_get_valid_sectors(cmd
) < 0)
2920 goto out_invalid_cdb_field
;
2922 cmd
->execute_task
= target_emulate_synchronize_cache
;
2925 size
= get_unaligned_be16(&cdb
[7]);
2926 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2928 cmd
->execute_task
= target_emulate_unmap
;
2931 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2933 goto out_unsupported_cdb
;
2936 size
= transport_get_size(1, cdb
, cmd
);
2938 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2939 goto out_invalid_cdb_field
;
2942 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
2943 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2945 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2946 goto out_invalid_cdb_field
;
2948 cmd
->execute_task
= target_emulate_write_same
;
2951 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2953 goto out_unsupported_cdb
;
2956 size
= transport_get_size(1, cdb
, cmd
);
2958 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2959 goto out_invalid_cdb_field
;
2962 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
2963 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
2965 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2966 * of byte 1 bit 3 UNMAP instead of original reserved field
2968 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
2969 goto out_invalid_cdb_field
;
2971 cmd
->execute_task
= target_emulate_write_same
;
2973 case ALLOW_MEDIUM_REMOVAL
:
2979 case TEST_UNIT_READY
:
2981 case WRITE_FILEMARKS
:
2982 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2984 cmd
->execute_task
= target_emulate_noop
;
2986 case GPCMD_CLOSE_TRACK
:
2987 case INITIALIZE_ELEMENT_STATUS
:
2988 case GPCMD_LOAD_UNLOAD
:
2989 case GPCMD_SET_SPEED
:
2991 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
2994 cmd
->execute_task
= target_report_luns
;
2995 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2997 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2998 * See spc4r17 section 5.3
3000 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3001 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3002 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3005 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3006 " 0x%02x, sending CHECK_CONDITION.\n",
3007 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3008 goto out_unsupported_cdb
;
3011 if (size
!= cmd
->data_length
) {
3012 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3013 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3014 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3015 cmd
->data_length
, size
, cdb
[0]);
3017 cmd
->cmd_spdtl
= size
;
3019 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3020 pr_err("Rejecting underflow/overflow"
3022 goto out_invalid_cdb_field
;
3025 * Reject READ_* or WRITE_* with overflow/underflow for
3026 * type SCF_SCSI_DATA_SG_IO_CDB.
3028 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3029 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3030 " CDB on non 512-byte sector setup subsystem"
3031 " plugin: %s\n", dev
->transport
->name
);
3032 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3033 goto out_invalid_cdb_field
;
3036 if (size
> cmd
->data_length
) {
3037 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3038 cmd
->residual_count
= (size
- cmd
->data_length
);
3040 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3041 cmd
->residual_count
= (cmd
->data_length
- size
);
3043 cmd
->data_length
= size
;
3046 /* reject any command that we don't have a handler for */
3047 if (!(passthrough
|| cmd
->execute_task
||
3048 (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
3049 goto out_unsupported_cdb
;
3051 /* Let's limit control cdbs to a page, for simplicity's sake. */
3052 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3054 goto out_invalid_cdb_field
;
3056 transport_set_supported_SAM_opcode(cmd
);
3059 out_unsupported_cdb
:
3060 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3061 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3063 out_invalid_cdb_field
:
3064 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3065 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3070 * Called from I/O completion to determine which dormant/delayed
3071 * and ordered cmds need to have their tasks added to the execution queue.
3073 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3075 struct se_device
*dev
= cmd
->se_dev
;
3076 struct se_cmd
*cmd_p
, *cmd_tmp
;
3077 int new_active_tasks
= 0;
3079 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3080 atomic_dec(&dev
->simple_cmds
);
3081 smp_mb__after_atomic_dec();
3082 dev
->dev_cur_ordered_id
++;
3083 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3084 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3085 cmd
->se_ordered_id
);
3086 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3087 dev
->dev_cur_ordered_id
++;
3088 pr_debug("Incremented dev_cur_ordered_id: %u for"
3089 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3090 cmd
->se_ordered_id
);
3091 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3092 atomic_dec(&dev
->dev_ordered_sync
);
3093 smp_mb__after_atomic_dec();
3095 dev
->dev_cur_ordered_id
++;
3096 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3097 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3100 * Process all commands up to the last received
3101 * ORDERED task attribute which requires another blocking
3104 spin_lock(&dev
->delayed_cmd_lock
);
3105 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3106 &dev
->delayed_cmd_list
, se_delayed_node
) {
3108 list_del(&cmd_p
->se_delayed_node
);
3109 spin_unlock(&dev
->delayed_cmd_lock
);
3111 pr_debug("Calling add_tasks() for"
3112 " cmd_p: 0x%02x Task Attr: 0x%02x"
3113 " Dormant -> Active, se_ordered_id: %u\n",
3114 cmd_p
->t_task_cdb
[0],
3115 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3117 transport_add_tasks_from_cmd(cmd_p
);
3120 spin_lock(&dev
->delayed_cmd_lock
);
3121 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3124 spin_unlock(&dev
->delayed_cmd_lock
);
3126 * If new tasks have become active, wake up the transport thread
3127 * to do the processing of the Active tasks.
3129 if (new_active_tasks
!= 0)
3130 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3133 static void transport_complete_qf(struct se_cmd
*cmd
)
3137 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3138 transport_complete_task_attr(cmd
);
3140 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3141 ret
= cmd
->se_tfo
->queue_status(cmd
);
3146 switch (cmd
->data_direction
) {
3147 case DMA_FROM_DEVICE
:
3148 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3151 if (cmd
->t_bidi_data_sg
) {
3152 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3156 /* Fall through for DMA_TO_DEVICE */
3158 ret
= cmd
->se_tfo
->queue_status(cmd
);
3166 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3169 transport_lun_remove_cmd(cmd
);
3170 transport_cmd_check_stop_to_fabric(cmd
);
3173 static void transport_handle_queue_full(
3175 struct se_device
*dev
)
3177 spin_lock_irq(&dev
->qf_cmd_lock
);
3178 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3179 atomic_inc(&dev
->dev_qf_count
);
3180 smp_mb__after_atomic_inc();
3181 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3183 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3186 static void target_complete_ok_work(struct work_struct
*work
)
3188 struct se_cmd
*cmd
= container_of(work
, struct se_cmd
, work
);
3189 int reason
= 0, ret
;
3192 * Check if we need to move delayed/dormant tasks from cmds on the
3193 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3196 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3197 transport_complete_task_attr(cmd
);
3199 * Check to schedule QUEUE_FULL work, or execute an existing
3200 * cmd->transport_qf_callback()
3202 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3203 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3206 * Check if we need to retrieve a sense buffer from
3207 * the struct se_cmd in question.
3209 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3210 if (transport_get_sense_data(cmd
) < 0)
3211 reason
= TCM_NON_EXISTENT_LUN
;
3214 * Only set when an struct se_task->task_scsi_status returned
3215 * a non GOOD status.
3217 if (cmd
->scsi_status
) {
3218 ret
= transport_send_check_condition_and_sense(
3220 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3223 transport_lun_remove_cmd(cmd
);
3224 transport_cmd_check_stop_to_fabric(cmd
);
3229 * Check for a callback, used by amongst other things
3230 * XDWRITE_READ_10 emulation.
3232 if (cmd
->transport_complete_callback
)
3233 cmd
->transport_complete_callback(cmd
);
3235 switch (cmd
->data_direction
) {
3236 case DMA_FROM_DEVICE
:
3237 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3238 if (cmd
->se_lun
->lun_sep
) {
3239 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3242 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3244 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3245 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3249 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3250 if (cmd
->se_lun
->lun_sep
) {
3251 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3254 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3256 * Check if we need to send READ payload for BIDI-COMMAND
3258 if (cmd
->t_bidi_data_sg
) {
3259 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3260 if (cmd
->se_lun
->lun_sep
) {
3261 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3264 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3265 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3266 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3270 /* Fall through for DMA_TO_DEVICE */
3272 ret
= cmd
->se_tfo
->queue_status(cmd
);
3273 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3280 transport_lun_remove_cmd(cmd
);
3281 transport_cmd_check_stop_to_fabric(cmd
);
3285 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3286 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3287 cmd
->t_state
= TRANSPORT_COMPLETE_QF_OK
;
3288 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3291 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3293 struct se_task
*task
, *task_tmp
;
3294 unsigned long flags
;
3295 LIST_HEAD(dispose_list
);
3297 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3298 list_for_each_entry_safe(task
, task_tmp
,
3299 &cmd
->t_task_list
, t_list
) {
3300 if (!(task
->task_flags
& TF_ACTIVE
))
3301 list_move_tail(&task
->t_list
, &dispose_list
);
3303 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3305 while (!list_empty(&dispose_list
)) {
3306 task
= list_first_entry(&dispose_list
, struct se_task
, t_list
);
3308 if (task
->task_sg
!= cmd
->t_data_sg
&&
3309 task
->task_sg
!= cmd
->t_bidi_data_sg
)
3310 kfree(task
->task_sg
);
3312 list_del(&task
->t_list
);
3314 cmd
->se_dev
->transport
->free_task(task
);
3318 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3320 struct scatterlist
*sg
;
3323 for_each_sg(sgl
, sg
, nents
, count
)
3324 __free_page(sg_page(sg
));
3329 static inline void transport_free_pages(struct se_cmd
*cmd
)
3331 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3334 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3335 cmd
->t_data_sg
= NULL
;
3336 cmd
->t_data_nents
= 0;
3338 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3339 cmd
->t_bidi_data_sg
= NULL
;
3340 cmd
->t_bidi_data_nents
= 0;
3344 * transport_release_cmd - free a command
3345 * @cmd: command to free
3347 * This routine unconditionally frees a command, and reference counting
3348 * or list removal must be done in the caller.
3350 static void transport_release_cmd(struct se_cmd
*cmd
)
3352 BUG_ON(!cmd
->se_tfo
);
3354 if (cmd
->se_tmr_req
)
3355 core_tmr_release_req(cmd
->se_tmr_req
);
3356 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
3357 kfree(cmd
->t_task_cdb
);
3359 * Check if target_wait_for_sess_cmds() is expecting to
3360 * release se_cmd directly here..
3362 if (cmd
->check_release
!= 0 && cmd
->se_tfo
->check_release_cmd
)
3363 if (cmd
->se_tfo
->check_release_cmd(cmd
) != 0)
3366 cmd
->se_tfo
->release_cmd(cmd
);
3370 * transport_put_cmd - release a reference to a command
3371 * @cmd: command to release
3373 * This routine releases our reference to the command and frees it if possible.
3375 static void transport_put_cmd(struct se_cmd
*cmd
)
3377 unsigned long flags
;
3380 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3381 if (atomic_read(&cmd
->t_fe_count
)) {
3382 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3386 if (atomic_read(&cmd
->t_se_count
)) {
3387 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3391 if (atomic_read(&cmd
->transport_dev_active
)) {
3392 atomic_set(&cmd
->transport_dev_active
, 0);
3393 transport_all_task_dev_remove_state(cmd
);
3396 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3398 if (free_tasks
!= 0)
3399 transport_free_dev_tasks(cmd
);
3401 transport_free_pages(cmd
);
3402 transport_release_cmd(cmd
);
3405 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3409 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3410 * allocating in the core.
3411 * @cmd: Associated se_cmd descriptor
3412 * @mem: SGL style memory for TCM WRITE / READ
3413 * @sg_mem_num: Number of SGL elements
3414 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3415 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3417 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3420 int transport_generic_map_mem_to_cmd(
3422 struct scatterlist
*sgl
,
3424 struct scatterlist
*sgl_bidi
,
3427 if (!sgl
|| !sgl_count
)
3430 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3431 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3433 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3434 * scatterlists already have been set to follow what the fabric
3435 * passes for the original expected data transfer length.
3437 if (cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3438 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3439 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3440 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3441 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3445 cmd
->t_data_sg
= sgl
;
3446 cmd
->t_data_nents
= sgl_count
;
3448 if (sgl_bidi
&& sgl_bidi_count
) {
3449 cmd
->t_bidi_data_sg
= sgl_bidi
;
3450 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3452 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3457 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3459 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3461 struct scatterlist
*sg
= cmd
->t_data_sg
;
3465 * We need to take into account a possible offset here for fabrics like
3466 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3467 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3469 return kmap(sg_page(sg
)) + sg
->offset
;
3471 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3473 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3475 kunmap(sg_page(cmd
->t_data_sg
));
3477 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3480 transport_generic_get_mem(struct se_cmd
*cmd
)
3482 u32 length
= cmd
->data_length
;
3487 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3488 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3489 if (!cmd
->t_data_sg
)
3492 cmd
->t_data_nents
= nents
;
3493 sg_init_table(cmd
->t_data_sg
, nents
);
3496 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3497 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3501 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3509 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3512 kfree(cmd
->t_data_sg
);
3513 cmd
->t_data_sg
= NULL
;
3517 /* Reduce sectors if they are too long for the device */
3518 static inline sector_t
transport_limit_task_sectors(
3519 struct se_device
*dev
,
3520 unsigned long long lba
,
3523 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3525 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3526 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3527 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3534 * This function can be used by HW target mode drivers to create a linked
3535 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3536 * This is intended to be called during the completion path by TCM Core
3537 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3539 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3541 struct scatterlist
*sg_first
= NULL
;
3542 struct scatterlist
*sg_prev
= NULL
;
3543 int sg_prev_nents
= 0;
3544 struct scatterlist
*sg
;
3545 struct se_task
*task
;
3546 u32 chained_nents
= 0;
3549 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3552 * Walk the struct se_task list and setup scatterlist chains
3553 * for each contiguously allocated struct se_task->task_sg[].
3555 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3560 sg_first
= task
->task_sg
;
3561 chained_nents
= task
->task_sg_nents
;
3563 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3564 chained_nents
+= task
->task_sg_nents
;
3567 * For the padded tasks, use the extra SGL vector allocated
3568 * in transport_allocate_data_tasks() for the sg_prev_nents
3569 * offset into sg_chain() above.
3571 * We do not need the padding for the last task (or a single
3572 * task), but in that case we will never use the sg_prev_nents
3573 * value below which would be incorrect.
3575 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3576 sg_prev
= task
->task_sg
;
3579 * Setup the starting pointer and total t_tasks_sg_linked_no including
3580 * padding SGs for linking and to mark the end.
3582 cmd
->t_tasks_sg_chained
= sg_first
;
3583 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3585 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3586 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3587 cmd
->t_tasks_sg_chained_no
);
3589 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
3590 cmd
->t_tasks_sg_chained_no
, i
) {
3592 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3593 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
3594 if (sg_is_chain(sg
))
3595 pr_debug("SG: %p sg_is_chain=1\n", sg
);
3597 pr_debug("SG: %p sg_is_last=1\n", sg
);
3600 EXPORT_SYMBOL(transport_do_task_sg_chain
);
3603 * Break up cmd into chunks transport can handle
3606 transport_allocate_data_tasks(struct se_cmd
*cmd
,
3607 enum dma_data_direction data_direction
,
3608 struct scatterlist
*cmd_sg
, unsigned int sgl_nents
)
3610 struct se_device
*dev
= cmd
->se_dev
;
3612 unsigned long long lba
;
3613 sector_t sectors
, dev_max_sectors
;
3616 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3619 dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
3620 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
3622 WARN_ON(cmd
->data_length
% sector_size
);
3624 lba
= cmd
->t_task_lba
;
3625 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
3626 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
3629 * If we need just a single task reuse the SG list in the command
3630 * and avoid a lot of work.
3632 if (task_count
== 1) {
3633 struct se_task
*task
;
3634 unsigned long flags
;
3636 task
= transport_generic_get_task(cmd
, data_direction
);
3640 task
->task_sg
= cmd_sg
;
3641 task
->task_sg_nents
= sgl_nents
;
3643 task
->task_lba
= lba
;
3644 task
->task_sectors
= sectors
;
3645 task
->task_size
= task
->task_sectors
* sector_size
;
3647 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3648 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3649 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3654 for (i
= 0; i
< task_count
; i
++) {
3655 struct se_task
*task
;
3656 unsigned int task_size
, task_sg_nents_padded
;
3657 struct scatterlist
*sg
;
3658 unsigned long flags
;
3661 task
= transport_generic_get_task(cmd
, data_direction
);
3665 task
->task_lba
= lba
;
3666 task
->task_sectors
= min(sectors
, dev_max_sectors
);
3667 task
->task_size
= task
->task_sectors
* sector_size
;
3670 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3671 * in order to calculate the number per task SGL entries
3673 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
3675 * Check if the fabric module driver is requesting that all
3676 * struct se_task->task_sg[] be chained together.. If so,
3677 * then allocate an extra padding SG entry for linking and
3678 * marking the end of the chained SGL for every task except
3679 * the last one for (task_count > 1) operation, or skipping
3680 * the extra padding for the (task_count == 1) case.
3682 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
3683 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
3685 task_sg_nents_padded
= task
->task_sg_nents
;
3687 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
3688 task_sg_nents_padded
, GFP_KERNEL
);
3689 if (!task
->task_sg
) {
3690 cmd
->se_dev
->transport
->free_task(task
);
3694 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
3696 task_size
= task
->task_size
;
3698 /* Build new sgl, only up to task_size */
3699 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
3700 if (cmd_sg
->length
> task_size
)
3704 task_size
-= cmd_sg
->length
;
3705 cmd_sg
= sg_next(cmd_sg
);
3708 lba
+= task
->task_sectors
;
3709 sectors
-= task
->task_sectors
;
3711 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3712 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3713 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3720 transport_allocate_control_task(struct se_cmd
*cmd
)
3722 struct se_task
*task
;
3723 unsigned long flags
;
3725 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
3729 task
->task_sg
= cmd
->t_data_sg
;
3730 task
->task_size
= cmd
->data_length
;
3731 task
->task_sg_nents
= cmd
->t_data_nents
;
3733 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3734 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
3735 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3737 /* Success! Return number of tasks allocated */
3742 * Allocate any required ressources to execute the command, and either place
3743 * it on the execution queue if possible. For writes we might not have the
3744 * payload yet, thus notify the fabric via a call to ->write_pending instead.
3746 int transport_generic_new_cmd(struct se_cmd
*cmd
)
3748 struct se_device
*dev
= cmd
->se_dev
;
3749 int task_cdbs
, task_cdbs_bidi
= 0;
3754 * Determine is the TCM fabric module has already allocated physical
3755 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3758 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
3760 ret
= transport_generic_get_mem(cmd
);
3766 * For BIDI command set up the read tasks first.
3768 if (cmd
->t_bidi_data_sg
&&
3769 dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
3770 BUG_ON(!(cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
));
3772 task_cdbs_bidi
= transport_allocate_data_tasks(cmd
,
3773 DMA_FROM_DEVICE
, cmd
->t_bidi_data_sg
,
3774 cmd
->t_bidi_data_nents
);
3775 if (task_cdbs_bidi
<= 0)
3778 atomic_inc(&cmd
->t_fe_count
);
3779 atomic_inc(&cmd
->t_se_count
);
3783 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
3784 task_cdbs
= transport_allocate_data_tasks(cmd
,
3785 cmd
->data_direction
, cmd
->t_data_sg
,
3788 task_cdbs
= transport_allocate_control_task(cmd
);
3793 else if (!task_cdbs
&& (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)) {
3794 cmd
->t_state
= TRANSPORT_COMPLETE
;
3795 atomic_set(&cmd
->t_transport_active
, 1);
3796 INIT_WORK(&cmd
->work
, target_complete_ok_work
);
3797 queue_work(target_completion_wq
, &cmd
->work
);
3802 atomic_inc(&cmd
->t_fe_count
);
3803 atomic_inc(&cmd
->t_se_count
);
3806 cmd
->t_task_list_num
= (task_cdbs
+ task_cdbs_bidi
);
3807 atomic_set(&cmd
->t_task_cdbs_left
, cmd
->t_task_list_num
);
3808 atomic_set(&cmd
->t_task_cdbs_ex_left
, cmd
->t_task_list_num
);
3811 * For WRITEs, let the fabric know its buffer is ready..
3812 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3813 * will be added to the struct se_device execution queue after its WRITE
3814 * data has arrived. (ie: It gets handled by the transport processing
3815 * thread a second time)
3817 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3818 transport_add_tasks_to_state_queue(cmd
);
3819 return transport_generic_write_pending(cmd
);
3822 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3823 * to the execution queue.
3825 transport_execute_tasks(cmd
);
3829 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3830 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3833 EXPORT_SYMBOL(transport_generic_new_cmd
);
3835 /* transport_generic_process_write():
3839 void transport_generic_process_write(struct se_cmd
*cmd
)
3841 transport_execute_tasks(cmd
);
3843 EXPORT_SYMBOL(transport_generic_process_write
);
3845 static void transport_write_pending_qf(struct se_cmd
*cmd
)
3849 ret
= cmd
->se_tfo
->write_pending(cmd
);
3850 if (ret
== -EAGAIN
|| ret
== -ENOMEM
) {
3851 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3853 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3857 static int transport_generic_write_pending(struct se_cmd
*cmd
)
3859 unsigned long flags
;
3862 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3863 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
3864 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3867 * Clear the se_cmd for WRITE_PENDING status in order to set
3868 * cmd->t_transport_active=0 so that transport_generic_handle_data
3869 * can be called from HW target mode interrupt code. This is safe
3870 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
3871 * because the se_cmd->se_lun pointer is not being cleared.
3873 transport_cmd_check_stop(cmd
, 1, 0);
3876 * Call the fabric write_pending function here to let the
3877 * frontend know that WRITE buffers are ready.
3879 ret
= cmd
->se_tfo
->write_pending(cmd
);
3880 if (ret
== -EAGAIN
|| ret
== -ENOMEM
)
3888 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
3889 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
3890 transport_handle_queue_full(cmd
, cmd
->se_dev
);
3894 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
3896 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
3897 if (wait_for_tasks
&& cmd
->se_tmr_req
)
3898 transport_wait_for_tasks(cmd
);
3900 transport_release_cmd(cmd
);
3903 transport_wait_for_tasks(cmd
);
3905 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
3908 transport_lun_remove_cmd(cmd
);
3910 transport_free_dev_tasks(cmd
);
3912 transport_put_cmd(cmd
);
3915 EXPORT_SYMBOL(transport_generic_free_cmd
);
3917 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3918 * @se_sess: session to reference
3919 * @se_cmd: command descriptor to add
3921 void target_get_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
3923 unsigned long flags
;
3925 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3926 list_add_tail(&se_cmd
->se_cmd_list
, &se_sess
->sess_cmd_list
);
3927 se_cmd
->check_release
= 1;
3928 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3930 EXPORT_SYMBOL(target_get_sess_cmd
);
3932 /* target_put_sess_cmd - Check for active I/O shutdown or list delete
3933 * @se_sess: session to reference
3934 * @se_cmd: command descriptor to drop
3936 int target_put_sess_cmd(struct se_session
*se_sess
, struct se_cmd
*se_cmd
)
3938 unsigned long flags
;
3940 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3941 if (list_empty(&se_cmd
->se_cmd_list
)) {
3942 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3947 if (se_sess
->sess_tearing_down
&& se_cmd
->cmd_wait_set
) {
3948 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3949 complete(&se_cmd
->cmd_wait_comp
);
3952 list_del(&se_cmd
->se_cmd_list
);
3953 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3957 EXPORT_SYMBOL(target_put_sess_cmd
);
3959 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3960 * @se_sess: session to split
3962 void target_splice_sess_cmd_list(struct se_session
*se_sess
)
3964 struct se_cmd
*se_cmd
;
3965 unsigned long flags
;
3967 WARN_ON(!list_empty(&se_sess
->sess_wait_list
));
3968 INIT_LIST_HEAD(&se_sess
->sess_wait_list
);
3970 spin_lock_irqsave(&se_sess
->sess_cmd_lock
, flags
);
3971 se_sess
->sess_tearing_down
= 1;
3973 list_splice_init(&se_sess
->sess_cmd_list
, &se_sess
->sess_wait_list
);
3975 list_for_each_entry(se_cmd
, &se_sess
->sess_wait_list
, se_cmd_list
)
3976 se_cmd
->cmd_wait_set
= 1;
3978 spin_unlock_irqrestore(&se_sess
->sess_cmd_lock
, flags
);
3980 EXPORT_SYMBOL(target_splice_sess_cmd_list
);
3982 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
3983 * @se_sess: session to wait for active I/O
3984 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3986 void target_wait_for_sess_cmds(
3987 struct se_session
*se_sess
,
3990 struct se_cmd
*se_cmd
, *tmp_cmd
;
3993 list_for_each_entry_safe(se_cmd
, tmp_cmd
,
3994 &se_sess
->sess_wait_list
, se_cmd_list
) {
3995 list_del(&se_cmd
->se_cmd_list
);
3997 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3998 " %d\n", se_cmd
, se_cmd
->t_state
,
3999 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4001 if (wait_for_tasks
) {
4002 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4003 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4004 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4006 rc
= transport_wait_for_tasks(se_cmd
);
4008 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4009 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4010 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4014 wait_for_completion(&se_cmd
->cmd_wait_comp
);
4015 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4016 " fabric state: %d\n", se_cmd
, se_cmd
->t_state
,
4017 se_cmd
->se_tfo
->get_cmd_state(se_cmd
));
4020 se_cmd
->se_tfo
->release_cmd(se_cmd
);
4023 EXPORT_SYMBOL(target_wait_for_sess_cmds
);
4025 /* transport_lun_wait_for_tasks():
4027 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4028 * an struct se_lun to be successfully shutdown.
4030 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4032 unsigned long flags
;
4035 * If the frontend has already requested this struct se_cmd to
4036 * be stopped, we can safely ignore this struct se_cmd.
4038 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4039 if (atomic_read(&cmd
->t_transport_stop
)) {
4040 atomic_set(&cmd
->transport_lun_stop
, 0);
4041 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4042 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4043 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4044 transport_cmd_check_stop(cmd
, 1, 0);
4047 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4048 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4050 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4052 ret
= transport_stop_tasks_for_cmd(cmd
);
4054 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4055 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4057 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4058 cmd
->se_tfo
->get_task_tag(cmd
));
4059 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4060 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4061 cmd
->se_tfo
->get_task_tag(cmd
));
4063 transport_remove_cmd_from_queue(cmd
);
4068 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4070 struct se_cmd
*cmd
= NULL
;
4071 unsigned long lun_flags
, cmd_flags
;
4073 * Do exception processing and return CHECK_CONDITION status to the
4076 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4077 while (!list_empty(&lun
->lun_cmd_list
)) {
4078 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4079 struct se_cmd
, se_lun_node
);
4080 list_del(&cmd
->se_lun_node
);
4082 atomic_set(&cmd
->transport_lun_active
, 0);
4084 * This will notify iscsi_target_transport.c:
4085 * transport_cmd_check_stop() that a LUN shutdown is in
4086 * progress for the iscsi_cmd_t.
4088 spin_lock(&cmd
->t_state_lock
);
4089 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4090 "_lun_stop for ITT: 0x%08x\n",
4091 cmd
->se_lun
->unpacked_lun
,
4092 cmd
->se_tfo
->get_task_tag(cmd
));
4093 atomic_set(&cmd
->transport_lun_stop
, 1);
4094 spin_unlock(&cmd
->t_state_lock
);
4096 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4099 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4100 cmd
->se_tfo
->get_task_tag(cmd
),
4101 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4105 * If the Storage engine still owns the iscsi_cmd_t, determine
4106 * and/or stop its context.
4108 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4109 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4110 cmd
->se_tfo
->get_task_tag(cmd
));
4112 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4113 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4117 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4118 "_wait_for_tasks(): SUCCESS\n",
4119 cmd
->se_lun
->unpacked_lun
,
4120 cmd
->se_tfo
->get_task_tag(cmd
));
4122 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4123 if (!atomic_read(&cmd
->transport_dev_active
)) {
4124 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4127 atomic_set(&cmd
->transport_dev_active
, 0);
4128 transport_all_task_dev_remove_state(cmd
);
4129 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4131 transport_free_dev_tasks(cmd
);
4133 * The Storage engine stopped this struct se_cmd before it was
4134 * send to the fabric frontend for delivery back to the
4135 * Initiator Node. Return this SCSI CDB back with an
4136 * CHECK_CONDITION status.
4139 transport_send_check_condition_and_sense(cmd
,
4140 TCM_NON_EXISTENT_LUN
, 0);
4142 * If the fabric frontend is waiting for this iscsi_cmd_t to
4143 * be released, notify the waiting thread now that LU has
4144 * finished accessing it.
4146 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4147 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4148 pr_debug("SE_LUN[%d] - Detected FE stop for"
4149 " struct se_cmd: %p ITT: 0x%08x\n",
4151 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4153 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4155 transport_cmd_check_stop(cmd
, 1, 0);
4156 complete(&cmd
->transport_lun_fe_stop_comp
);
4157 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4160 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4161 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4163 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4164 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4166 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4169 static int transport_clear_lun_thread(void *p
)
4171 struct se_lun
*lun
= (struct se_lun
*)p
;
4173 __transport_clear_lun_from_sessions(lun
);
4174 complete(&lun
->lun_shutdown_comp
);
4179 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4181 struct task_struct
*kt
;
4183 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4184 "tcm_cl_%u", lun
->unpacked_lun
);
4186 pr_err("Unable to start clear_lun thread\n");
4189 wait_for_completion(&lun
->lun_shutdown_comp
);
4195 * transport_wait_for_tasks - wait for completion to occur
4196 * @cmd: command to wait
4198 * Called from frontend fabric context to wait for storage engine
4199 * to pause and/or release frontend generated struct se_cmd.
4201 bool transport_wait_for_tasks(struct se_cmd
*cmd
)
4203 unsigned long flags
;
4205 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4206 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
)) {
4207 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4211 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4212 * has been set in transport_set_supported_SAM_opcode().
4214 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) && !cmd
->se_tmr_req
) {
4215 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4219 * If we are already stopped due to an external event (ie: LUN shutdown)
4220 * sleep until the connection can have the passed struct se_cmd back.
4221 * The cmd->transport_lun_stopped_sem will be upped by
4222 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4223 * has completed its operation on the struct se_cmd.
4225 if (atomic_read(&cmd
->transport_lun_stop
)) {
4227 pr_debug("wait_for_tasks: Stopping"
4228 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4229 "_stop_comp); for ITT: 0x%08x\n",
4230 cmd
->se_tfo
->get_task_tag(cmd
));
4232 * There is a special case for WRITES where a FE exception +
4233 * LUN shutdown means ConfigFS context is still sleeping on
4234 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4235 * We go ahead and up transport_lun_stop_comp just to be sure
4238 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4239 complete(&cmd
->transport_lun_stop_comp
);
4240 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4241 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4243 transport_all_task_dev_remove_state(cmd
);
4245 * At this point, the frontend who was the originator of this
4246 * struct se_cmd, now owns the structure and can be released through
4247 * normal means below.
4249 pr_debug("wait_for_tasks: Stopped"
4250 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4251 "stop_comp); for ITT: 0x%08x\n",
4252 cmd
->se_tfo
->get_task_tag(cmd
));
4254 atomic_set(&cmd
->transport_lun_stop
, 0);
4256 if (!atomic_read(&cmd
->t_transport_active
) ||
4257 atomic_read(&cmd
->t_transport_aborted
)) {
4258 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4262 atomic_set(&cmd
->t_transport_stop
, 1);
4264 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4265 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4266 cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4267 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4269 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4271 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4273 wait_for_completion(&cmd
->t_transport_stop_comp
);
4275 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4276 atomic_set(&cmd
->t_transport_active
, 0);
4277 atomic_set(&cmd
->t_transport_stop
, 0);
4279 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4280 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4281 cmd
->se_tfo
->get_task_tag(cmd
));
4283 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4287 EXPORT_SYMBOL(transport_wait_for_tasks
);
4289 static int transport_get_sense_codes(
4294 *asc
= cmd
->scsi_asc
;
4295 *ascq
= cmd
->scsi_ascq
;
4300 static int transport_set_sense_codes(
4305 cmd
->scsi_asc
= asc
;
4306 cmd
->scsi_ascq
= ascq
;
4311 int transport_send_check_condition_and_sense(
4316 unsigned char *buffer
= cmd
->sense_buffer
;
4317 unsigned long flags
;
4319 u8 asc
= 0, ascq
= 0;
4321 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4322 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4323 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4326 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4327 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4329 if (!reason
&& from_transport
)
4332 if (!from_transport
)
4333 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4335 * Data Segment and SenseLength of the fabric response PDU.
4337 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4338 * from include/scsi/scsi_cmnd.h
4340 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4341 TRANSPORT_SENSE_BUFFER
);
4343 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4344 * SENSE KEY values from include/scsi/scsi.h
4347 case TCM_NON_EXISTENT_LUN
:
4349 buffer
[offset
] = 0x70;
4350 /* ILLEGAL REQUEST */
4351 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4352 /* LOGICAL UNIT NOT SUPPORTED */
4353 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4355 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4356 case TCM_SECTOR_COUNT_TOO_MANY
:
4358 buffer
[offset
] = 0x70;
4359 /* ILLEGAL REQUEST */
4360 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4361 /* INVALID COMMAND OPERATION CODE */
4362 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4364 case TCM_UNKNOWN_MODE_PAGE
:
4366 buffer
[offset
] = 0x70;
4367 /* ILLEGAL REQUEST */
4368 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4369 /* INVALID FIELD IN CDB */
4370 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4372 case TCM_CHECK_CONDITION_ABORT_CMD
:
4374 buffer
[offset
] = 0x70;
4375 /* ABORTED COMMAND */
4376 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4377 /* BUS DEVICE RESET FUNCTION OCCURRED */
4378 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4379 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4381 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4383 buffer
[offset
] = 0x70;
4384 /* ABORTED COMMAND */
4385 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4387 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4388 /* NOT ENOUGH UNSOLICITED DATA */
4389 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4391 case TCM_INVALID_CDB_FIELD
:
4393 buffer
[offset
] = 0x70;
4394 /* ABORTED COMMAND */
4395 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4396 /* INVALID FIELD IN CDB */
4397 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4399 case TCM_INVALID_PARAMETER_LIST
:
4401 buffer
[offset
] = 0x70;
4402 /* ABORTED COMMAND */
4403 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4404 /* INVALID FIELD IN PARAMETER LIST */
4405 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4407 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4409 buffer
[offset
] = 0x70;
4410 /* ABORTED COMMAND */
4411 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4413 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4414 /* UNEXPECTED_UNSOLICITED_DATA */
4415 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4417 case TCM_SERVICE_CRC_ERROR
:
4419 buffer
[offset
] = 0x70;
4420 /* ABORTED COMMAND */
4421 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4422 /* PROTOCOL SERVICE CRC ERROR */
4423 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4425 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4427 case TCM_SNACK_REJECTED
:
4429 buffer
[offset
] = 0x70;
4430 /* ABORTED COMMAND */
4431 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4433 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4434 /* FAILED RETRANSMISSION REQUEST */
4435 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4437 case TCM_WRITE_PROTECTED
:
4439 buffer
[offset
] = 0x70;
4441 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4442 /* WRITE PROTECTED */
4443 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4445 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4447 buffer
[offset
] = 0x70;
4448 /* UNIT ATTENTION */
4449 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4450 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4451 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4452 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4454 case TCM_CHECK_CONDITION_NOT_READY
:
4456 buffer
[offset
] = 0x70;
4458 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4459 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4460 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4461 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4463 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4466 buffer
[offset
] = 0x70;
4467 /* ILLEGAL REQUEST */
4468 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4469 /* LOGICAL UNIT COMMUNICATION FAILURE */
4470 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4474 * This code uses linux/include/scsi/scsi.h SAM status codes!
4476 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4478 * Automatically padded, this value is encoded in the fabric's
4479 * data_length response PDU containing the SCSI defined sense data.
4481 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4484 return cmd
->se_tfo
->queue_status(cmd
);
4486 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4488 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4492 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4494 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4497 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4498 " status for CDB: 0x%02x ITT: 0x%08x\n",
4500 cmd
->se_tfo
->get_task_tag(cmd
));
4502 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4503 cmd
->se_tfo
->queue_status(cmd
);
4508 EXPORT_SYMBOL(transport_check_aborted_status
);
4510 void transport_send_task_abort(struct se_cmd
*cmd
)
4512 unsigned long flags
;
4514 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4515 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4516 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4519 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4522 * If there are still expected incoming fabric WRITEs, we wait
4523 * until until they have completed before sending a TASK_ABORTED
4524 * response. This response with TASK_ABORTED status will be
4525 * queued back to fabric module by transport_check_aborted_status().
4527 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4528 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4529 atomic_inc(&cmd
->t_transport_aborted
);
4530 smp_mb__after_atomic_inc();
4533 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4535 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4536 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4537 cmd
->se_tfo
->get_task_tag(cmd
));
4539 cmd
->se_tfo
->queue_status(cmd
);
4542 static int transport_generic_do_tmr(struct se_cmd
*cmd
)
4544 struct se_device
*dev
= cmd
->se_dev
;
4545 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4548 switch (tmr
->function
) {
4549 case TMR_ABORT_TASK
:
4550 tmr
->response
= TMR_FUNCTION_REJECTED
;
4552 case TMR_ABORT_TASK_SET
:
4554 case TMR_CLEAR_TASK_SET
:
4555 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4558 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4559 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4560 TMR_FUNCTION_REJECTED
;
4562 case TMR_TARGET_WARM_RESET
:
4563 tmr
->response
= TMR_FUNCTION_REJECTED
;
4565 case TMR_TARGET_COLD_RESET
:
4566 tmr
->response
= TMR_FUNCTION_REJECTED
;
4569 pr_err("Uknown TMR function: 0x%02x.\n",
4571 tmr
->response
= TMR_FUNCTION_REJECTED
;
4575 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4576 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4578 transport_cmd_check_stop_to_fabric(cmd
);
4582 /* transport_processing_thread():
4586 static int transport_processing_thread(void *param
)
4590 struct se_device
*dev
= (struct se_device
*) param
;
4592 while (!kthread_should_stop()) {
4593 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4594 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4595 kthread_should_stop());
4600 __transport_execute_tasks(dev
);
4602 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4606 switch (cmd
->t_state
) {
4607 case TRANSPORT_NEW_CMD
:
4610 case TRANSPORT_NEW_CMD_MAP
:
4611 if (!cmd
->se_tfo
->new_cmd_map
) {
4612 pr_err("cmd->se_tfo->new_cmd_map is"
4613 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4616 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4618 transport_generic_request_failure(cmd
);
4621 ret
= transport_generic_new_cmd(cmd
);
4623 transport_generic_request_failure(cmd
);
4627 case TRANSPORT_PROCESS_WRITE
:
4628 transport_generic_process_write(cmd
);
4630 case TRANSPORT_PROCESS_TMR
:
4631 transport_generic_do_tmr(cmd
);
4633 case TRANSPORT_COMPLETE_QF_WP
:
4634 transport_write_pending_qf(cmd
);
4636 case TRANSPORT_COMPLETE_QF_OK
:
4637 transport_complete_qf(cmd
);
4640 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4641 "i_state: %d on SE LUN: %u\n",
4643 cmd
->se_tfo
->get_task_tag(cmd
),
4644 cmd
->se_tfo
->get_cmd_state(cmd
),
4645 cmd
->se_lun
->unpacked_lun
);
4653 WARN_ON(!list_empty(&dev
->state_task_list
));
4654 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4655 dev
->process_thread
= NULL
;