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 <asm/unaligned.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_tcq.h>
46 #include <target/target_core_base.h>
47 #include <target/target_core_device.h>
48 #include <target/target_core_tmr.h>
49 #include <target/target_core_tpg.h>
50 #include <target/target_core_transport.h>
51 #include <target/target_core_fabric_ops.h>
52 #include <target/target_core_configfs.h>
54 #include "target_core_alua.h"
55 #include "target_core_hba.h"
56 #include "target_core_pr.h"
57 #include "target_core_scdb.h"
58 #include "target_core_ua.h"
60 static int sub_api_initialized
;
62 static struct kmem_cache
*se_cmd_cache
;
63 static struct kmem_cache
*se_sess_cache
;
64 struct kmem_cache
*se_tmr_req_cache
;
65 struct kmem_cache
*se_ua_cache
;
66 struct kmem_cache
*t10_pr_reg_cache
;
67 struct kmem_cache
*t10_alua_lu_gp_cache
;
68 struct kmem_cache
*t10_alua_lu_gp_mem_cache
;
69 struct kmem_cache
*t10_alua_tg_pt_gp_cache
;
70 struct kmem_cache
*t10_alua_tg_pt_gp_mem_cache
;
72 static int transport_generic_write_pending(struct se_cmd
*);
73 static int transport_processing_thread(void *param
);
74 static int __transport_execute_tasks(struct se_device
*dev
);
75 static void transport_complete_task_attr(struct se_cmd
*cmd
);
76 static int transport_complete_qf(struct se_cmd
*cmd
);
77 static void transport_handle_queue_full(struct se_cmd
*cmd
,
78 struct se_device
*dev
, int (*qf_callback
)(struct se_cmd
*));
79 static void transport_direct_request_timeout(struct se_cmd
*cmd
);
80 static void transport_free_dev_tasks(struct se_cmd
*cmd
);
81 static u32
transport_allocate_tasks(struct se_cmd
*cmd
,
82 unsigned long long starting_lba
,
83 enum dma_data_direction data_direction
,
84 struct scatterlist
*sgl
, unsigned int nents
);
85 static int transport_generic_get_mem(struct se_cmd
*cmd
);
86 static void transport_put_cmd(struct se_cmd
*cmd
);
87 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
88 struct se_queue_obj
*qobj
);
89 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
90 static void transport_stop_all_task_timers(struct se_cmd
*cmd
);
92 int init_se_kmem_caches(void)
94 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
95 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
97 pr_err("kmem_cache_create for struct se_cmd failed\n");
100 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
101 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
103 if (!se_tmr_req_cache
) {
104 pr_err("kmem_cache_create() for struct se_tmr_req"
108 se_sess_cache
= kmem_cache_create("se_sess_cache",
109 sizeof(struct se_session
), __alignof__(struct se_session
),
111 if (!se_sess_cache
) {
112 pr_err("kmem_cache_create() for struct se_session"
116 se_ua_cache
= kmem_cache_create("se_ua_cache",
117 sizeof(struct se_ua
), __alignof__(struct se_ua
),
120 pr_err("kmem_cache_create() for struct se_ua failed\n");
123 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
124 sizeof(struct t10_pr_registration
),
125 __alignof__(struct t10_pr_registration
), 0, NULL
);
126 if (!t10_pr_reg_cache
) {
127 pr_err("kmem_cache_create() for struct t10_pr_registration"
131 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
132 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
134 if (!t10_alua_lu_gp_cache
) {
135 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
139 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
140 sizeof(struct t10_alua_lu_gp_member
),
141 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
142 if (!t10_alua_lu_gp_mem_cache
) {
143 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
147 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
148 sizeof(struct t10_alua_tg_pt_gp
),
149 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
150 if (!t10_alua_tg_pt_gp_cache
) {
151 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
155 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
156 "t10_alua_tg_pt_gp_mem_cache",
157 sizeof(struct t10_alua_tg_pt_gp_member
),
158 __alignof__(struct t10_alua_tg_pt_gp_member
),
160 if (!t10_alua_tg_pt_gp_mem_cache
) {
161 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
169 kmem_cache_destroy(se_cmd_cache
);
170 if (se_tmr_req_cache
)
171 kmem_cache_destroy(se_tmr_req_cache
);
173 kmem_cache_destroy(se_sess_cache
);
175 kmem_cache_destroy(se_ua_cache
);
176 if (t10_pr_reg_cache
)
177 kmem_cache_destroy(t10_pr_reg_cache
);
178 if (t10_alua_lu_gp_cache
)
179 kmem_cache_destroy(t10_alua_lu_gp_cache
);
180 if (t10_alua_lu_gp_mem_cache
)
181 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
182 if (t10_alua_tg_pt_gp_cache
)
183 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
184 if (t10_alua_tg_pt_gp_mem_cache
)
185 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
189 void release_se_kmem_caches(void)
191 kmem_cache_destroy(se_cmd_cache
);
192 kmem_cache_destroy(se_tmr_req_cache
);
193 kmem_cache_destroy(se_sess_cache
);
194 kmem_cache_destroy(se_ua_cache
);
195 kmem_cache_destroy(t10_pr_reg_cache
);
196 kmem_cache_destroy(t10_alua_lu_gp_cache
);
197 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
198 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
199 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
202 /* This code ensures unique mib indexes are handed out. */
203 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
204 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
207 * Allocate a new row index for the entry type specified
209 u32
scsi_get_new_index(scsi_index_t type
)
213 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
215 spin_lock(&scsi_mib_index_lock
);
216 new_index
= ++scsi_mib_index
[type
];
217 spin_unlock(&scsi_mib_index_lock
);
222 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
224 atomic_set(&qobj
->queue_cnt
, 0);
225 INIT_LIST_HEAD(&qobj
->qobj_list
);
226 init_waitqueue_head(&qobj
->thread_wq
);
227 spin_lock_init(&qobj
->cmd_queue_lock
);
229 EXPORT_SYMBOL(transport_init_queue_obj
);
231 static int transport_subsystem_reqmods(void)
235 ret
= request_module("target_core_iblock");
237 pr_err("Unable to load target_core_iblock\n");
239 ret
= request_module("target_core_file");
241 pr_err("Unable to load target_core_file\n");
243 ret
= request_module("target_core_pscsi");
245 pr_err("Unable to load target_core_pscsi\n");
247 ret
= request_module("target_core_stgt");
249 pr_err("Unable to load target_core_stgt\n");
254 int transport_subsystem_check_init(void)
258 if (sub_api_initialized
)
261 * Request the loading of known TCM subsystem plugins..
263 ret
= transport_subsystem_reqmods();
267 sub_api_initialized
= 1;
271 struct se_session
*transport_init_session(void)
273 struct se_session
*se_sess
;
275 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
277 pr_err("Unable to allocate struct se_session from"
279 return ERR_PTR(-ENOMEM
);
281 INIT_LIST_HEAD(&se_sess
->sess_list
);
282 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
286 EXPORT_SYMBOL(transport_init_session
);
289 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
291 void __transport_register_session(
292 struct se_portal_group
*se_tpg
,
293 struct se_node_acl
*se_nacl
,
294 struct se_session
*se_sess
,
295 void *fabric_sess_ptr
)
297 unsigned char buf
[PR_REG_ISID_LEN
];
299 se_sess
->se_tpg
= se_tpg
;
300 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
302 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
304 * Only set for struct se_session's that will actually be moving I/O.
305 * eg: *NOT* discovery sessions.
309 * If the fabric module supports an ISID based TransportID,
310 * save this value in binary from the fabric I_T Nexus now.
312 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
313 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
314 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
315 &buf
[0], PR_REG_ISID_LEN
);
316 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
318 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
320 * The se_nacl->nacl_sess pointer will be set to the
321 * last active I_T Nexus for each struct se_node_acl.
323 se_nacl
->nacl_sess
= se_sess
;
325 list_add_tail(&se_sess
->sess_acl_list
,
326 &se_nacl
->acl_sess_list
);
327 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
329 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
331 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
332 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
334 EXPORT_SYMBOL(__transport_register_session
);
336 void transport_register_session(
337 struct se_portal_group
*se_tpg
,
338 struct se_node_acl
*se_nacl
,
339 struct se_session
*se_sess
,
340 void *fabric_sess_ptr
)
342 spin_lock_bh(&se_tpg
->session_lock
);
343 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
344 spin_unlock_bh(&se_tpg
->session_lock
);
346 EXPORT_SYMBOL(transport_register_session
);
348 void transport_deregister_session_configfs(struct se_session
*se_sess
)
350 struct se_node_acl
*se_nacl
;
353 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
355 se_nacl
= se_sess
->se_node_acl
;
357 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
358 list_del(&se_sess
->sess_acl_list
);
360 * If the session list is empty, then clear the pointer.
361 * Otherwise, set the struct se_session pointer from the tail
362 * element of the per struct se_node_acl active session list.
364 if (list_empty(&se_nacl
->acl_sess_list
))
365 se_nacl
->nacl_sess
= NULL
;
367 se_nacl
->nacl_sess
= container_of(
368 se_nacl
->acl_sess_list
.prev
,
369 struct se_session
, sess_acl_list
);
371 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
374 EXPORT_SYMBOL(transport_deregister_session_configfs
);
376 void transport_free_session(struct se_session
*se_sess
)
378 kmem_cache_free(se_sess_cache
, se_sess
);
380 EXPORT_SYMBOL(transport_free_session
);
382 void transport_deregister_session(struct se_session
*se_sess
)
384 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
385 struct se_node_acl
*se_nacl
;
389 transport_free_session(se_sess
);
393 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
394 list_del(&se_sess
->sess_list
);
395 se_sess
->se_tpg
= NULL
;
396 se_sess
->fabric_sess_ptr
= NULL
;
397 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
400 * Determine if we need to do extra work for this initiator node's
401 * struct se_node_acl if it had been previously dynamically generated.
403 se_nacl
= se_sess
->se_node_acl
;
405 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
406 if (se_nacl
->dynamic_node_acl
) {
407 if (!se_tpg
->se_tpg_tfo
->tpg_check_demo_mode_cache(
409 list_del(&se_nacl
->acl_list
);
410 se_tpg
->num_node_acls
--;
411 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
413 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
414 core_free_device_list_for_node(se_nacl
, se_tpg
);
415 se_tpg
->se_tpg_tfo
->tpg_release_fabric_acl(se_tpg
,
417 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
420 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
423 transport_free_session(se_sess
);
425 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
426 se_tpg
->se_tpg_tfo
->get_fabric_name());
428 EXPORT_SYMBOL(transport_deregister_session
);
431 * Called with cmd->t_state_lock held.
433 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
435 struct se_device
*dev
= cmd
->se_dev
;
436 struct se_task
*task
;
442 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
443 if (task
->task_flags
& TF_ACTIVE
)
446 if (!atomic_read(&task
->task_state_active
))
449 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
450 list_del(&task
->t_state_list
);
451 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
452 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
453 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
455 atomic_set(&task
->task_state_active
, 0);
456 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
460 /* transport_cmd_check_stop():
462 * 'transport_off = 1' determines if t_transport_active should be cleared.
463 * 'transport_off = 2' determines if task_dev_state should be removed.
465 * A non-zero u8 t_state sets cmd->t_state.
466 * Returns 1 when command is stopped, else 0.
468 static int transport_cmd_check_stop(
475 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
477 * Determine if IOCTL context caller in requesting the stopping of this
478 * command for LUN shutdown purposes.
480 if (atomic_read(&cmd
->transport_lun_stop
)) {
481 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
482 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
483 cmd
->se_tfo
->get_task_tag(cmd
));
485 cmd
->deferred_t_state
= cmd
->t_state
;
486 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
487 atomic_set(&cmd
->t_transport_active
, 0);
488 if (transport_off
== 2)
489 transport_all_task_dev_remove_state(cmd
);
490 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
492 complete(&cmd
->transport_lun_stop_comp
);
496 * Determine if frontend context caller is requesting the stopping of
497 * this command for frontend exceptions.
499 if (atomic_read(&cmd
->t_transport_stop
)) {
500 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
501 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
502 cmd
->se_tfo
->get_task_tag(cmd
));
504 cmd
->deferred_t_state
= cmd
->t_state
;
505 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
506 if (transport_off
== 2)
507 transport_all_task_dev_remove_state(cmd
);
510 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
513 if (transport_off
== 2)
515 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
517 complete(&cmd
->t_transport_stop_comp
);
521 atomic_set(&cmd
->t_transport_active
, 0);
522 if (transport_off
== 2) {
523 transport_all_task_dev_remove_state(cmd
);
525 * Clear struct se_cmd->se_lun before the transport_off == 2
526 * handoff to fabric module.
530 * Some fabric modules like tcm_loop can release
531 * their internally allocated I/O reference now and
534 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
535 spin_unlock_irqrestore(
536 &cmd
->t_state_lock
, flags
);
538 cmd
->se_tfo
->check_stop_free(cmd
);
542 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
546 cmd
->t_state
= t_state
;
547 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
552 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
554 return transport_cmd_check_stop(cmd
, 2, 0);
557 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
559 struct se_lun
*lun
= cmd
->se_lun
;
565 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
566 if (!atomic_read(&cmd
->transport_dev_active
)) {
567 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
570 atomic_set(&cmd
->transport_dev_active
, 0);
571 transport_all_task_dev_remove_state(cmd
);
572 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
576 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
577 if (atomic_read(&cmd
->transport_lun_active
)) {
578 list_del(&cmd
->se_lun_node
);
579 atomic_set(&cmd
->transport_lun_active
, 0);
581 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
582 cmd
->se_tfo
->get_task_tag(cmd
), lun
->unpacked_lun
);
585 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
588 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
590 if (!cmd
->se_tmr_req
)
591 transport_lun_remove_cmd(cmd
);
593 if (transport_cmd_check_stop_to_fabric(cmd
))
596 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
597 transport_put_cmd(cmd
);
601 static void transport_add_cmd_to_queue(
605 struct se_device
*dev
= cmd
->se_dev
;
606 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
610 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
611 cmd
->t_state
= t_state
;
612 atomic_set(&cmd
->t_transport_active
, 1);
613 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
616 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
618 /* If the cmd is already on the list, remove it before we add it */
619 if (!list_empty(&cmd
->se_queue_node
))
620 list_del(&cmd
->se_queue_node
);
622 atomic_inc(&qobj
->queue_cnt
);
624 if (cmd
->se_cmd_flags
& SCF_EMULATE_QUEUE_FULL
) {
625 cmd
->se_cmd_flags
&= ~SCF_EMULATE_QUEUE_FULL
;
626 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
628 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
629 atomic_set(&cmd
->t_transport_queue_active
, 1);
630 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
632 wake_up_interruptible(&qobj
->thread_wq
);
635 static struct se_cmd
*
636 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
641 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
642 if (list_empty(&qobj
->qobj_list
)) {
643 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
646 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
648 atomic_set(&cmd
->t_transport_queue_active
, 0);
650 list_del_init(&cmd
->se_queue_node
);
651 atomic_dec(&qobj
->queue_cnt
);
652 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
657 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
658 struct se_queue_obj
*qobj
)
662 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
663 if (!atomic_read(&cmd
->t_transport_queue_active
)) {
664 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
667 atomic_set(&cmd
->t_transport_queue_active
, 0);
668 atomic_dec(&qobj
->queue_cnt
);
669 list_del_init(&cmd
->se_queue_node
);
670 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
672 if (atomic_read(&cmd
->t_transport_queue_active
)) {
673 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
674 cmd
->se_tfo
->get_task_tag(cmd
),
675 atomic_read(&cmd
->t_transport_queue_active
));
680 * Completion function used by TCM subsystem plugins (such as FILEIO)
681 * for queueing up response from struct se_subsystem_api->do_task()
683 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
685 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
686 struct se_task
, t_list
);
689 cmd
->scsi_status
= SAM_STAT_GOOD
;
690 task
->task_scsi_status
= GOOD
;
692 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
693 task
->task_error_status
= PYX_TRANSPORT_ILLEGAL_REQUEST
;
694 task
->task_se_cmd
->transport_error_status
=
695 PYX_TRANSPORT_ILLEGAL_REQUEST
;
698 transport_complete_task(task
, good
);
700 EXPORT_SYMBOL(transport_complete_sync_cache
);
702 /* transport_complete_task():
704 * Called from interrupt and non interrupt context depending
705 * on the transport plugin.
707 void transport_complete_task(struct se_task
*task
, int success
)
709 struct se_cmd
*cmd
= task
->task_se_cmd
;
710 struct se_device
*dev
= cmd
->se_dev
;
714 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
715 cmd
->t_task_cdb
[0], dev
);
718 atomic_inc(&dev
->depth_left
);
720 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
721 task
->task_flags
&= ~TF_ACTIVE
;
724 * See if any sense data exists, if so set the TASK_SENSE flag.
725 * Also check for any other post completion work that needs to be
726 * done by the plugins.
728 if (dev
&& dev
->transport
->transport_complete
) {
729 if (dev
->transport
->transport_complete(task
) != 0) {
730 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
731 task
->task_sense
= 1;
737 * See if we are waiting for outstanding struct se_task
738 * to complete for an exception condition
740 if (task
->task_flags
& TF_REQUEST_STOP
) {
742 * Decrement cmd->t_se_count if this task had
743 * previously thrown its timeout exception handler.
745 if (task
->task_flags
& TF_TIMEOUT
) {
746 atomic_dec(&cmd
->t_se_count
);
747 task
->task_flags
&= ~TF_TIMEOUT
;
749 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
751 complete(&task
->task_stop_comp
);
755 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
756 * left counter to determine when the struct se_cmd is ready to be queued to
757 * the processing thread.
759 if (task
->task_flags
& TF_TIMEOUT
) {
760 if (!atomic_dec_and_test(
761 &cmd
->t_task_cdbs_timeout_left
)) {
762 spin_unlock_irqrestore(&cmd
->t_state_lock
,
766 t_state
= TRANSPORT_COMPLETE_TIMEOUT
;
767 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
769 transport_add_cmd_to_queue(cmd
, t_state
);
772 atomic_dec(&cmd
->t_task_cdbs_timeout_left
);
775 * Decrement the outstanding t_task_cdbs_left count. The last
776 * struct se_task from struct se_cmd will complete itself into the
777 * device queue depending upon int success.
779 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
781 cmd
->t_tasks_failed
= 1;
783 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
787 if (!success
|| cmd
->t_tasks_failed
) {
788 t_state
= TRANSPORT_COMPLETE_FAILURE
;
789 if (!task
->task_error_status
) {
790 task
->task_error_status
=
791 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
792 cmd
->transport_error_status
=
793 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
796 atomic_set(&cmd
->t_transport_complete
, 1);
797 t_state
= TRANSPORT_COMPLETE_OK
;
799 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
801 transport_add_cmd_to_queue(cmd
, t_state
);
803 EXPORT_SYMBOL(transport_complete_task
);
806 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
807 * struct se_task list are ready to be added to the active execution list
810 * Called with se_dev_t->execute_task_lock called.
812 static inline int transport_add_task_check_sam_attr(
813 struct se_task
*task
,
814 struct se_task
*task_prev
,
815 struct se_device
*dev
)
818 * No SAM Task attribute emulation enabled, add to tail of
821 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
822 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
826 * HEAD_OF_QUEUE attribute for received CDB, which means
827 * the first task that is associated with a struct se_cmd goes to
828 * head of the struct se_device->execute_task_list, and task_prev
829 * after that for each subsequent task
831 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
832 list_add(&task
->t_execute_list
,
833 (task_prev
!= NULL
) ?
834 &task_prev
->t_execute_list
:
835 &dev
->execute_task_list
);
837 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
838 " in execution queue\n",
839 task
->task_se_cmd
->t_task_cdb
[0]);
843 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
844 * transitioned from Dermant -> Active state, and are added to the end
845 * of the struct se_device->execute_task_list
847 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
851 /* __transport_add_task_to_execute_queue():
853 * Called with se_dev_t->execute_task_lock called.
855 static void __transport_add_task_to_execute_queue(
856 struct se_task
*task
,
857 struct se_task
*task_prev
,
858 struct se_device
*dev
)
862 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
863 atomic_inc(&dev
->execute_tasks
);
865 if (atomic_read(&task
->task_state_active
))
868 * Determine if this task needs to go to HEAD_OF_QUEUE for the
869 * state list as well. Running with SAM Task Attribute emulation
870 * will always return head_of_queue == 0 here
873 list_add(&task
->t_state_list
, (task_prev
) ?
874 &task_prev
->t_state_list
:
875 &dev
->state_task_list
);
877 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
879 atomic_set(&task
->task_state_active
, 1);
881 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
882 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
886 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
888 struct se_device
*dev
= cmd
->se_dev
;
889 struct se_task
*task
;
892 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
893 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
894 if (atomic_read(&task
->task_state_active
))
897 spin_lock(&dev
->execute_task_lock
);
898 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
899 atomic_set(&task
->task_state_active
, 1);
901 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
902 task
->task_se_cmd
->se_tfo
->get_task_tag(
903 task
->task_se_cmd
), task
, dev
);
905 spin_unlock(&dev
->execute_task_lock
);
907 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
910 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
912 struct se_device
*dev
= cmd
->se_dev
;
913 struct se_task
*task
, *task_prev
= NULL
;
916 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
917 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
918 if (atomic_read(&task
->task_execute_queue
))
921 * __transport_add_task_to_execute_queue() handles the
922 * SAM Task Attribute emulation if enabled
924 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
925 atomic_set(&task
->task_execute_queue
, 1);
928 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
931 /* transport_remove_task_from_execute_queue():
935 void transport_remove_task_from_execute_queue(
936 struct se_task
*task
,
937 struct se_device
*dev
)
941 if (atomic_read(&task
->task_execute_queue
) == 0) {
946 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
947 list_del(&task
->t_execute_list
);
948 atomic_set(&task
->task_execute_queue
, 0);
949 atomic_dec(&dev
->execute_tasks
);
950 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
954 * Handle QUEUE_FULL / -EAGAIN status
957 static void target_qf_do_work(struct work_struct
*work
)
959 struct se_device
*dev
= container_of(work
, struct se_device
,
961 LIST_HEAD(qf_cmd_list
);
962 struct se_cmd
*cmd
, *cmd_tmp
;
964 spin_lock_irq(&dev
->qf_cmd_lock
);
965 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
966 spin_unlock_irq(&dev
->qf_cmd_lock
);
968 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
969 list_del(&cmd
->se_qf_node
);
970 atomic_dec(&dev
->dev_qf_count
);
971 smp_mb__after_atomic_dec();
973 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
974 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
975 (cmd
->t_state
== TRANSPORT_COMPLETE_OK
) ? "COMPLETE_OK" :
976 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
979 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
980 * has been added to head of queue
982 transport_add_cmd_to_queue(cmd
, cmd
->t_state
);
986 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
988 switch (cmd
->data_direction
) {
991 case DMA_FROM_DEVICE
:
995 case DMA_BIDIRECTIONAL
:
1004 void transport_dump_dev_state(
1005 struct se_device
*dev
,
1009 *bl
+= sprintf(b
+ *bl
, "Status: ");
1010 switch (dev
->dev_status
) {
1011 case TRANSPORT_DEVICE_ACTIVATED
:
1012 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1014 case TRANSPORT_DEVICE_DEACTIVATED
:
1015 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1017 case TRANSPORT_DEVICE_SHUTDOWN
:
1018 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1020 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1021 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1022 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1025 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1029 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1030 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1032 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1033 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
1034 *bl
+= sprintf(b
+ *bl
, " ");
1037 void transport_dump_vpd_proto_id(
1038 struct t10_vpd
*vpd
,
1039 unsigned char *p_buf
,
1042 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1045 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1046 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1048 switch (vpd
->protocol_identifier
) {
1050 sprintf(buf
+len
, "Fibre Channel\n");
1053 sprintf(buf
+len
, "Parallel SCSI\n");
1056 sprintf(buf
+len
, "SSA\n");
1059 sprintf(buf
+len
, "IEEE 1394\n");
1062 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1066 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1069 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1072 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1076 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1079 sprintf(buf
+len
, "Unknown 0x%02x\n",
1080 vpd
->protocol_identifier
);
1085 strncpy(p_buf
, buf
, p_buf_len
);
1087 pr_debug("%s", buf
);
1091 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1094 * Check if the Protocol Identifier Valid (PIV) bit is set..
1096 * from spc3r23.pdf section 7.5.1
1098 if (page_83
[1] & 0x80) {
1099 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1100 vpd
->protocol_identifier_set
= 1;
1101 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1104 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1106 int transport_dump_vpd_assoc(
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 Association: ");
1118 switch (vpd
->association
) {
1120 sprintf(buf
+len
, "addressed logical unit\n");
1123 sprintf(buf
+len
, "target port\n");
1126 sprintf(buf
+len
, "SCSI target device\n");
1129 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1135 strncpy(p_buf
, buf
, p_buf_len
);
1137 pr_debug("%s", buf
);
1142 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1145 * The VPD identification association..
1147 * from spc3r23.pdf Section 7.6.3.1 Table 297
1149 vpd
->association
= (page_83
[1] & 0x30);
1150 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1152 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1154 int transport_dump_vpd_ident_type(
1155 struct t10_vpd
*vpd
,
1156 unsigned char *p_buf
,
1159 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1163 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1164 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1166 switch (vpd
->device_identifier_type
) {
1168 sprintf(buf
+len
, "Vendor specific\n");
1171 sprintf(buf
+len
, "T10 Vendor ID based\n");
1174 sprintf(buf
+len
, "EUI-64 based\n");
1177 sprintf(buf
+len
, "NAA\n");
1180 sprintf(buf
+len
, "Relative target port identifier\n");
1183 sprintf(buf
+len
, "SCSI name string\n");
1186 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1187 vpd
->device_identifier_type
);
1193 if (p_buf_len
< strlen(buf
)+1)
1195 strncpy(p_buf
, buf
, p_buf_len
);
1197 pr_debug("%s", buf
);
1203 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1206 * The VPD identifier type..
1208 * from spc3r23.pdf Section 7.6.3.1 Table 298
1210 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1211 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1213 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1215 int transport_dump_vpd_ident(
1216 struct t10_vpd
*vpd
,
1217 unsigned char *p_buf
,
1220 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1223 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1225 switch (vpd
->device_identifier_code_set
) {
1226 case 0x01: /* Binary */
1227 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1228 &vpd
->device_identifier
[0]);
1230 case 0x02: /* ASCII */
1231 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1232 &vpd
->device_identifier
[0]);
1234 case 0x03: /* UTF-8 */
1235 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1236 &vpd
->device_identifier
[0]);
1239 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1240 " 0x%02x", vpd
->device_identifier_code_set
);
1246 strncpy(p_buf
, buf
, p_buf_len
);
1248 pr_debug("%s", buf
);
1254 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1256 static const char hex_str
[] = "0123456789abcdef";
1257 int j
= 0, i
= 4; /* offset to start of the identifer */
1260 * The VPD Code Set (encoding)
1262 * from spc3r23.pdf Section 7.6.3.1 Table 296
1264 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1265 switch (vpd
->device_identifier_code_set
) {
1266 case 0x01: /* Binary */
1267 vpd
->device_identifier
[j
++] =
1268 hex_str
[vpd
->device_identifier_type
];
1269 while (i
< (4 + page_83
[3])) {
1270 vpd
->device_identifier
[j
++] =
1271 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1272 vpd
->device_identifier
[j
++] =
1273 hex_str
[page_83
[i
] & 0x0f];
1277 case 0x02: /* ASCII */
1278 case 0x03: /* UTF-8 */
1279 while (i
< (4 + page_83
[3]))
1280 vpd
->device_identifier
[j
++] = page_83
[i
++];
1286 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1288 EXPORT_SYMBOL(transport_set_vpd_ident
);
1290 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1293 * If this device is from Target_Core_Mod/pSCSI, disable the
1294 * SAM Task Attribute emulation.
1296 * This is currently not available in upsream Linux/SCSI Target
1297 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1299 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1300 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1304 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1305 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1306 " device\n", dev
->transport
->name
,
1307 dev
->transport
->get_device_rev(dev
));
1310 static void scsi_dump_inquiry(struct se_device
*dev
)
1312 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1315 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1317 pr_debug(" Vendor: ");
1318 for (i
= 0; i
< 8; i
++)
1319 if (wwn
->vendor
[i
] >= 0x20)
1320 pr_debug("%c", wwn
->vendor
[i
]);
1324 pr_debug(" Model: ");
1325 for (i
= 0; i
< 16; i
++)
1326 if (wwn
->model
[i
] >= 0x20)
1327 pr_debug("%c", wwn
->model
[i
]);
1331 pr_debug(" Revision: ");
1332 for (i
= 0; i
< 4; i
++)
1333 if (wwn
->revision
[i
] >= 0x20)
1334 pr_debug("%c", wwn
->revision
[i
]);
1340 device_type
= dev
->transport
->get_device_type(dev
);
1341 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1342 pr_debug(" ANSI SCSI revision: %02x\n",
1343 dev
->transport
->get_device_rev(dev
));
1346 struct se_device
*transport_add_device_to_core_hba(
1348 struct se_subsystem_api
*transport
,
1349 struct se_subsystem_dev
*se_dev
,
1351 void *transport_dev
,
1352 struct se_dev_limits
*dev_limits
,
1353 const char *inquiry_prod
,
1354 const char *inquiry_rev
)
1357 struct se_device
*dev
;
1359 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1361 pr_err("Unable to allocate memory for se_dev_t\n");
1365 transport_init_queue_obj(&dev
->dev_queue_obj
);
1366 dev
->dev_flags
= device_flags
;
1367 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1368 dev
->dev_ptr
= transport_dev
;
1370 dev
->se_sub_dev
= se_dev
;
1371 dev
->transport
= transport
;
1372 atomic_set(&dev
->active_cmds
, 0);
1373 INIT_LIST_HEAD(&dev
->dev_list
);
1374 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1375 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1376 INIT_LIST_HEAD(&dev
->execute_task_list
);
1377 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1378 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1379 INIT_LIST_HEAD(&dev
->state_task_list
);
1380 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1381 spin_lock_init(&dev
->execute_task_lock
);
1382 spin_lock_init(&dev
->delayed_cmd_lock
);
1383 spin_lock_init(&dev
->ordered_cmd_lock
);
1384 spin_lock_init(&dev
->state_task_lock
);
1385 spin_lock_init(&dev
->dev_alua_lock
);
1386 spin_lock_init(&dev
->dev_reservation_lock
);
1387 spin_lock_init(&dev
->dev_status_lock
);
1388 spin_lock_init(&dev
->dev_status_thr_lock
);
1389 spin_lock_init(&dev
->se_port_lock
);
1390 spin_lock_init(&dev
->se_tmr_lock
);
1391 spin_lock_init(&dev
->qf_cmd_lock
);
1393 dev
->queue_depth
= dev_limits
->queue_depth
;
1394 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1395 atomic_set(&dev
->dev_ordered_id
, 0);
1397 se_dev_set_default_attribs(dev
, dev_limits
);
1399 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1400 dev
->creation_time
= get_jiffies_64();
1401 spin_lock_init(&dev
->stats_lock
);
1403 spin_lock(&hba
->device_lock
);
1404 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1406 spin_unlock(&hba
->device_lock
);
1408 * Setup the SAM Task Attribute emulation for struct se_device
1410 core_setup_task_attr_emulation(dev
);
1412 * Force PR and ALUA passthrough emulation with internal object use.
1414 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1416 * Setup the Reservations infrastructure for struct se_device
1418 core_setup_reservations(dev
, force_pt
);
1420 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1422 if (core_setup_alua(dev
, force_pt
) < 0)
1426 * Startup the struct se_device processing thread
1428 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1429 "LIO_%s", dev
->transport
->name
);
1430 if (IS_ERR(dev
->process_thread
)) {
1431 pr_err("Unable to create kthread: LIO_%s\n",
1432 dev
->transport
->name
);
1436 * Setup work_queue for QUEUE_FULL
1438 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1440 * Preload the initial INQUIRY const values if we are doing
1441 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1442 * passthrough because this is being provided by the backend LLD.
1443 * This is required so that transport_get_inquiry() copies these
1444 * originals once back into DEV_T10_WWN(dev) for the virtual device
1447 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1448 if (!inquiry_prod
|| !inquiry_rev
) {
1449 pr_err("All non TCM/pSCSI plugins require"
1450 " INQUIRY consts\n");
1454 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1455 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1456 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1458 scsi_dump_inquiry(dev
);
1462 kthread_stop(dev
->process_thread
);
1464 spin_lock(&hba
->device_lock
);
1465 list_del(&dev
->dev_list
);
1467 spin_unlock(&hba
->device_lock
);
1469 se_release_vpd_for_dev(dev
);
1475 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1477 /* transport_generic_prepare_cdb():
1479 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1480 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1481 * The point of this is since we are mapping iSCSI LUNs to
1482 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1483 * devices and HBAs for a loop.
1485 static inline void transport_generic_prepare_cdb(
1489 case READ_10
: /* SBC - RDProtect */
1490 case READ_12
: /* SBC - RDProtect */
1491 case READ_16
: /* SBC - RDProtect */
1492 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1493 case VERIFY
: /* SBC - VRProtect */
1494 case VERIFY_16
: /* SBC - VRProtect */
1495 case WRITE_VERIFY
: /* SBC - VRProtect */
1496 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1499 cdb
[1] &= 0x1f; /* clear logical unit number */
1504 static struct se_task
*
1505 transport_generic_get_task(struct se_cmd
*cmd
,
1506 enum dma_data_direction data_direction
)
1508 struct se_task
*task
;
1509 struct se_device
*dev
= cmd
->se_dev
;
1511 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1513 pr_err("Unable to allocate struct se_task\n");
1517 INIT_LIST_HEAD(&task
->t_list
);
1518 INIT_LIST_HEAD(&task
->t_execute_list
);
1519 INIT_LIST_HEAD(&task
->t_state_list
);
1520 init_completion(&task
->task_stop_comp
);
1521 task
->task_se_cmd
= cmd
;
1522 task
->task_data_direction
= data_direction
;
1527 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1530 * Used by fabric modules containing a local struct se_cmd within their
1531 * fabric dependent per I/O descriptor.
1533 void transport_init_se_cmd(
1535 struct target_core_fabric_ops
*tfo
,
1536 struct se_session
*se_sess
,
1540 unsigned char *sense_buffer
)
1542 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1543 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1544 INIT_LIST_HEAD(&cmd
->se_ordered_node
);
1545 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1546 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1548 INIT_LIST_HEAD(&cmd
->t_task_list
);
1549 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1550 init_completion(&cmd
->transport_lun_stop_comp
);
1551 init_completion(&cmd
->t_transport_stop_comp
);
1552 spin_lock_init(&cmd
->t_state_lock
);
1553 atomic_set(&cmd
->transport_dev_active
, 1);
1556 cmd
->se_sess
= se_sess
;
1557 cmd
->data_length
= data_length
;
1558 cmd
->data_direction
= data_direction
;
1559 cmd
->sam_task_attr
= task_attr
;
1560 cmd
->sense_buffer
= sense_buffer
;
1562 EXPORT_SYMBOL(transport_init_se_cmd
);
1564 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1567 * Check if SAM Task Attribute emulation is enabled for this
1568 * struct se_device storage object
1570 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1573 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1574 pr_debug("SAM Task Attribute ACA"
1575 " emulation is not supported\n");
1579 * Used to determine when ORDERED commands should go from
1580 * Dormant to Active status.
1582 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1583 smp_mb__after_atomic_inc();
1584 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1585 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1586 cmd
->se_dev
->transport
->name
);
1590 /* transport_generic_allocate_tasks():
1592 * Called from fabric RX Thread.
1594 int transport_generic_allocate_tasks(
1600 transport_generic_prepare_cdb(cdb
);
1602 * Ensure that the received CDB is less than the max (252 + 8) bytes
1603 * for VARIABLE_LENGTH_CMD
1605 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1606 pr_err("Received SCSI CDB with command_size: %d that"
1607 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1608 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1612 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1613 * allocate the additional extended CDB buffer now.. Otherwise
1614 * setup the pointer from __t_task_cdb to t_task_cdb.
1616 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1617 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1619 if (!cmd
->t_task_cdb
) {
1620 pr_err("Unable to allocate cmd->t_task_cdb"
1621 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1622 scsi_command_size(cdb
),
1623 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1627 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1629 * Copy the original CDB into cmd->
1631 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1633 * Setup the received CDB based on SCSI defined opcodes and
1634 * perform unit attention, persistent reservations and ALUA
1635 * checks for virtual device backends. The cmd->t_task_cdb
1636 * pointer is expected to be setup before we reach this point.
1638 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1642 * Check for SAM Task Attribute Emulation
1644 if (transport_check_alloc_task_attr(cmd
) < 0) {
1645 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1646 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1649 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1650 if (cmd
->se_lun
->lun_sep
)
1651 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1652 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1655 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1657 static void transport_generic_request_failure(struct se_cmd
*,
1658 struct se_device
*, int, int);
1660 * Used by fabric module frontends to queue tasks directly.
1661 * Many only be used from process context only
1663 int transport_handle_cdb_direct(
1670 pr_err("cmd->se_lun is NULL\n");
1673 if (in_interrupt()) {
1675 pr_err("transport_generic_handle_cdb cannot be called"
1676 " from interrupt context\n");
1680 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1681 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1682 * in existing usage to ensure that outstanding descriptors are handled
1683 * correctly during shutdown via transport_wait_for_tasks()
1685 * Also, we don't take cmd->t_state_lock here as we only expect
1686 * this to be called for initial descriptor submission.
1688 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1689 atomic_set(&cmd
->t_transport_active
, 1);
1691 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1692 * so follow TRANSPORT_NEW_CMD processing thread context usage
1693 * and call transport_generic_request_failure() if necessary..
1695 ret
= transport_generic_new_cmd(cmd
);
1699 cmd
->transport_error_status
= ret
;
1700 transport_generic_request_failure(cmd
, NULL
, 0,
1701 (cmd
->data_direction
!= DMA_TO_DEVICE
));
1705 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1708 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1709 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1710 * complete setup in TCM process context w/ TFO->new_cmd_map().
1712 int transport_generic_handle_cdb_map(
1717 pr_err("cmd->se_lun is NULL\n");
1721 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
);
1724 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1726 /* transport_generic_handle_data():
1730 int transport_generic_handle_data(
1734 * For the software fabric case, then we assume the nexus is being
1735 * failed/shutdown when signals are pending from the kthread context
1736 * caller, so we return a failure. For the HW target mode case running
1737 * in interrupt code, the signal_pending() check is skipped.
1739 if (!in_interrupt() && signal_pending(current
))
1742 * If the received CDB has aleady been ABORTED by the generic
1743 * target engine, we now call transport_check_aborted_status()
1744 * to queue any delated TASK_ABORTED status for the received CDB to the
1745 * fabric module as we are expecting no further incoming DATA OUT
1746 * sequences at this point.
1748 if (transport_check_aborted_status(cmd
, 1) != 0)
1751 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
);
1754 EXPORT_SYMBOL(transport_generic_handle_data
);
1756 /* transport_generic_handle_tmr():
1760 int transport_generic_handle_tmr(
1763 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
);
1766 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1768 void transport_generic_free_cmd_intr(
1771 transport_add_cmd_to_queue(cmd
, TRANSPORT_FREE_CMD_INTR
);
1773 EXPORT_SYMBOL(transport_generic_free_cmd_intr
);
1775 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1777 struct se_task
*task
, *task_tmp
;
1778 unsigned long flags
;
1781 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1782 cmd
->se_tfo
->get_task_tag(cmd
));
1785 * No tasks remain in the execution queue
1787 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1788 list_for_each_entry_safe(task
, task_tmp
,
1789 &cmd
->t_task_list
, t_list
) {
1790 pr_debug("task_no[%d] - Processing task %p\n",
1791 task
->task_no
, task
);
1793 * If the struct se_task has not been sent and is not active,
1794 * remove the struct se_task from the execution queue.
1796 if (!(task
->task_flags
& (TF_ACTIVE
| TF_SENT
))) {
1797 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1799 transport_remove_task_from_execute_queue(task
,
1802 pr_debug("task_no[%d] - Removed from execute queue\n",
1804 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1809 * If the struct se_task is active, sleep until it is returned
1812 if (task
->task_flags
& TF_ACTIVE
) {
1813 task
->task_flags
|= TF_REQUEST_STOP
;
1814 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1817 pr_debug("task_no[%d] - Waiting to complete\n",
1819 wait_for_completion(&task
->task_stop_comp
);
1820 pr_debug("task_no[%d] - Stopped successfully\n",
1823 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1824 atomic_dec(&cmd
->t_task_cdbs_left
);
1825 task
->task_flags
&= ~(TF_ACTIVE
| TF_REQUEST_STOP
);
1827 pr_debug("task_no[%d] - Did nothing\n", task
->task_no
);
1831 __transport_stop_task_timer(task
, &flags
);
1833 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1839 * Handle SAM-esque emulation for generic transport request failures.
1841 static void transport_generic_request_failure(
1843 struct se_device
*dev
,
1849 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1850 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1851 cmd
->t_task_cdb
[0]);
1852 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1853 " %d/%d transport_error_status: %d\n",
1854 cmd
->se_tfo
->get_cmd_state(cmd
),
1855 cmd
->t_state
, cmd
->deferred_t_state
,
1856 cmd
->transport_error_status
);
1857 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1858 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1859 " t_transport_active: %d t_transport_stop: %d"
1860 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1861 atomic_read(&cmd
->t_task_cdbs_left
),
1862 atomic_read(&cmd
->t_task_cdbs_sent
),
1863 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1864 atomic_read(&cmd
->t_transport_active
),
1865 atomic_read(&cmd
->t_transport_stop
),
1866 atomic_read(&cmd
->t_transport_sent
));
1868 transport_stop_all_task_timers(cmd
);
1871 atomic_inc(&dev
->depth_left
);
1873 * For SAM Task Attribute emulation for failed struct se_cmd
1875 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1876 transport_complete_task_attr(cmd
);
1879 transport_direct_request_timeout(cmd
);
1880 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
1883 switch (cmd
->transport_error_status
) {
1884 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
1885 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1887 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
1888 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
1890 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
1891 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1893 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
1894 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
1896 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
1898 transport_new_cmd_failure(cmd
);
1900 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1901 * we force this session to fall back to session
1904 cmd
->se_tfo
->fall_back_to_erl0(cmd
->se_sess
);
1905 cmd
->se_tfo
->stop_session(cmd
->se_sess
, 0, 0);
1908 case PYX_TRANSPORT_LU_COMM_FAILURE
:
1909 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
1910 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1912 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
1913 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
1915 case PYX_TRANSPORT_WRITE_PROTECTED
:
1916 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
1918 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
1920 * No SENSE Data payload for this case, set SCSI Status
1921 * and queue the response to $FABRIC_MOD.
1923 * Uses linux/include/scsi/scsi.h SAM status codes defs
1925 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
1927 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1928 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1931 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1934 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
1935 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
1936 cmd
->orig_fe_lun
, 0x2C,
1937 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
1939 ret
= cmd
->se_tfo
->queue_status(cmd
);
1943 case PYX_TRANSPORT_USE_SENSE_REASON
:
1945 * struct se_cmd->scsi_sense_reason already set
1949 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1951 cmd
->transport_error_status
);
1952 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1956 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1957 * make the call to transport_send_check_condition_and_sense()
1958 * directly. Otherwise expect the fabric to make the call to
1959 * transport_send_check_condition_and_sense() after handling
1960 * possible unsoliticied write data payloads.
1962 if (!sc
&& !cmd
->se_tfo
->new_cmd_map
)
1963 transport_new_cmd_failure(cmd
);
1965 ret
= transport_send_check_condition_and_sense(cmd
,
1966 cmd
->scsi_sense_reason
, 0);
1972 transport_lun_remove_cmd(cmd
);
1973 if (!transport_cmd_check_stop_to_fabric(cmd
))
1978 cmd
->t_state
= TRANSPORT_COMPLETE_OK
;
1979 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
1982 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
1984 unsigned long flags
;
1986 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1987 if (!atomic_read(&cmd
->t_transport_timeout
)) {
1988 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1991 if (atomic_read(&cmd
->t_task_cdbs_timeout_left
)) {
1992 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1996 atomic_sub(atomic_read(&cmd
->t_transport_timeout
),
1998 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2001 static void transport_generic_request_timeout(struct se_cmd
*cmd
)
2003 unsigned long flags
;
2006 * Reset cmd->t_se_count to allow transport_put_cmd()
2007 * to allow last call to free memory resources.
2009 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2010 if (atomic_read(&cmd
->t_transport_timeout
) > 1) {
2011 int tmp
= (atomic_read(&cmd
->t_transport_timeout
) - 1);
2013 atomic_sub(tmp
, &cmd
->t_se_count
);
2015 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2017 transport_put_cmd(cmd
);
2020 static inline u32
transport_lba_21(unsigned char *cdb
)
2022 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2025 static inline u32
transport_lba_32(unsigned char *cdb
)
2027 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2030 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2032 unsigned int __v1
, __v2
;
2034 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2035 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2037 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2041 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2043 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2045 unsigned int __v1
, __v2
;
2047 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2048 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2050 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2053 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2055 unsigned long flags
;
2057 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2058 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2059 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2063 * Called from interrupt context.
2065 static void transport_task_timeout_handler(unsigned long data
)
2067 struct se_task
*task
= (struct se_task
*)data
;
2068 struct se_cmd
*cmd
= task
->task_se_cmd
;
2069 unsigned long flags
;
2071 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2073 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2074 if (task
->task_flags
& TF_TIMER_STOP
) {
2075 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2078 task
->task_flags
&= ~TF_TIMER_RUNNING
;
2081 * Determine if transport_complete_task() has already been called.
2083 if (!(task
->task_flags
& TF_ACTIVE
)) {
2084 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2086 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2090 atomic_inc(&cmd
->t_se_count
);
2091 atomic_inc(&cmd
->t_transport_timeout
);
2092 cmd
->t_tasks_failed
= 1;
2094 task
->task_flags
|= TF_TIMEOUT
;
2095 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2096 task
->task_scsi_status
= 1;
2098 if (task
->task_flags
& TF_REQUEST_STOP
) {
2099 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2100 " == 1\n", task
, cmd
);
2101 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2102 complete(&task
->task_stop_comp
);
2106 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
2107 pr_debug("transport task: %p cmd: %p timeout non zero"
2108 " t_task_cdbs_left\n", task
, cmd
);
2109 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2112 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2115 cmd
->t_state
= TRANSPORT_COMPLETE_FAILURE
;
2116 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2118 transport_add_cmd_to_queue(cmd
, TRANSPORT_COMPLETE_FAILURE
);
2122 * Called with cmd->t_state_lock held.
2124 static void transport_start_task_timer(struct se_task
*task
)
2126 struct se_device
*dev
= task
->task_se_cmd
->se_dev
;
2129 if (task
->task_flags
& TF_TIMER_RUNNING
)
2132 * If the task_timeout is disabled, exit now.
2134 timeout
= dev
->se_sub_dev
->se_dev_attrib
.task_timeout
;
2138 init_timer(&task
->task_timer
);
2139 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2140 task
->task_timer
.data
= (unsigned long) task
;
2141 task
->task_timer
.function
= transport_task_timeout_handler
;
2143 task
->task_flags
|= TF_TIMER_RUNNING
;
2144 add_timer(&task
->task_timer
);
2146 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2147 " %d\n", task
->task_se_cmd
, task
, timeout
);
2152 * Called with spin_lock_irq(&cmd->t_state_lock) held.
2154 void __transport_stop_task_timer(struct se_task
*task
, unsigned long *flags
)
2156 struct se_cmd
*cmd
= task
->task_se_cmd
;
2158 if (!(task
->task_flags
& TF_TIMER_RUNNING
))
2161 task
->task_flags
|= TF_TIMER_STOP
;
2162 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
2164 del_timer_sync(&task
->task_timer
);
2166 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
2167 task
->task_flags
&= ~TF_TIMER_RUNNING
;
2168 task
->task_flags
&= ~TF_TIMER_STOP
;
2171 static void transport_stop_all_task_timers(struct se_cmd
*cmd
)
2173 struct se_task
*task
= NULL
, *task_tmp
;
2174 unsigned long flags
;
2176 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2177 list_for_each_entry_safe(task
, task_tmp
,
2178 &cmd
->t_task_list
, t_list
)
2179 __transport_stop_task_timer(task
, &flags
);
2180 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2183 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2185 if (dev
->dev_tcq_window_closed
++ <
2186 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2187 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2189 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2191 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
2196 * Called from Fabric Module context from transport_execute_tasks()
2198 * The return of this function determins if the tasks from struct se_cmd
2199 * get added to the execution queue in transport_execute_tasks(),
2200 * or are added to the delayed or ordered lists here.
2202 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2204 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2207 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2208 * to allow the passed struct se_cmd list of tasks to the front of the list.
2210 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2211 atomic_inc(&cmd
->se_dev
->dev_hoq_count
);
2212 smp_mb__after_atomic_inc();
2213 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2214 " 0x%02x, se_ordered_id: %u\n",
2216 cmd
->se_ordered_id
);
2218 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2219 spin_lock(&cmd
->se_dev
->ordered_cmd_lock
);
2220 list_add_tail(&cmd
->se_ordered_node
,
2221 &cmd
->se_dev
->ordered_cmd_list
);
2222 spin_unlock(&cmd
->se_dev
->ordered_cmd_lock
);
2224 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2225 smp_mb__after_atomic_inc();
2227 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2228 " list, se_ordered_id: %u\n",
2230 cmd
->se_ordered_id
);
2232 * Add ORDERED command to tail of execution queue if
2233 * no other older commands exist that need to be
2236 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2240 * For SIMPLE and UNTAGGED Task Attribute commands
2242 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2243 smp_mb__after_atomic_inc();
2246 * Otherwise if one or more outstanding ORDERED task attribute exist,
2247 * add the dormant task(s) built for the passed struct se_cmd to the
2248 * execution queue and become in Active state for this struct se_device.
2250 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2252 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2253 * will be drained upon completion of HEAD_OF_QUEUE task.
2255 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2256 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2257 list_add_tail(&cmd
->se_delayed_node
,
2258 &cmd
->se_dev
->delayed_cmd_list
);
2259 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2261 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2262 " delayed CMD list, se_ordered_id: %u\n",
2263 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2264 cmd
->se_ordered_id
);
2266 * Return zero to let transport_execute_tasks() know
2267 * not to add the delayed tasks to the execution list.
2272 * Otherwise, no ORDERED task attributes exist..
2278 * Called from fabric module context in transport_generic_new_cmd() and
2279 * transport_generic_process_write()
2281 static int transport_execute_tasks(struct se_cmd
*cmd
)
2285 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2286 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2287 transport_generic_request_failure(cmd
, NULL
, 0, 1);
2292 * Call transport_cmd_check_stop() to see if a fabric exception
2293 * has occurred that prevents execution.
2295 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2297 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2298 * attribute for the tasks of the received struct se_cmd CDB
2300 add_tasks
= transport_execute_task_attr(cmd
);
2304 * This calls transport_add_tasks_from_cmd() to handle
2305 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2306 * (if enabled) in __transport_add_task_to_execute_queue() and
2307 * transport_add_task_check_sam_attr().
2309 transport_add_tasks_from_cmd(cmd
);
2312 * Kick the execution queue for the cmd associated struct se_device
2316 __transport_execute_tasks(cmd
->se_dev
);
2321 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2322 * from struct se_device->execute_task_list and
2324 * Called from transport_processing_thread()
2326 static int __transport_execute_tasks(struct se_device
*dev
)
2329 struct se_cmd
*cmd
= NULL
;
2330 struct se_task
*task
= NULL
;
2331 unsigned long flags
;
2334 * Check if there is enough room in the device and HBA queue to send
2335 * struct se_tasks to the selected transport.
2338 if (!atomic_read(&dev
->depth_left
))
2339 return transport_tcq_window_closed(dev
);
2341 dev
->dev_tcq_window_closed
= 0;
2343 spin_lock_irq(&dev
->execute_task_lock
);
2344 if (list_empty(&dev
->execute_task_list
)) {
2345 spin_unlock_irq(&dev
->execute_task_lock
);
2348 task
= list_first_entry(&dev
->execute_task_list
,
2349 struct se_task
, t_execute_list
);
2350 list_del(&task
->t_execute_list
);
2351 atomic_set(&task
->task_execute_queue
, 0);
2352 atomic_dec(&dev
->execute_tasks
);
2353 spin_unlock_irq(&dev
->execute_task_lock
);
2355 atomic_dec(&dev
->depth_left
);
2357 cmd
= task
->task_se_cmd
;
2359 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2360 task
->task_flags
|= (TF_ACTIVE
| TF_SENT
);
2361 atomic_inc(&cmd
->t_task_cdbs_sent
);
2363 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2364 cmd
->t_task_list_num
)
2365 atomic_set(&cmd
->transport_sent
, 1);
2367 transport_start_task_timer(task
);
2368 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2370 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2371 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2372 * struct se_subsystem_api->do_task() caller below.
2374 if (cmd
->transport_emulate_cdb
) {
2375 error
= cmd
->transport_emulate_cdb(cmd
);
2377 cmd
->transport_error_status
= error
;
2378 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2379 task
->task_flags
&= ~TF_ACTIVE
;
2380 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2381 atomic_set(&cmd
->transport_sent
, 0);
2382 transport_stop_tasks_for_cmd(cmd
);
2383 transport_generic_request_failure(cmd
, dev
, 0, 1);
2387 * Handle the successful completion for transport_emulate_cdb()
2388 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2389 * Otherwise the caller is expected to complete the task with
2392 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2393 cmd
->scsi_status
= SAM_STAT_GOOD
;
2394 task
->task_scsi_status
= GOOD
;
2395 transport_complete_task(task
, 1);
2399 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2400 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2401 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2402 * LUN emulation code.
2404 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2405 * call ->do_task() directly and let the underlying TCM subsystem plugin
2406 * code handle the CDB emulation.
2408 if ((dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2409 (!(task
->task_se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2410 error
= transport_emulate_control_cdb(task
);
2412 error
= dev
->transport
->do_task(task
);
2415 cmd
->transport_error_status
= error
;
2416 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2417 task
->task_flags
&= ~TF_ACTIVE
;
2418 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2419 atomic_set(&cmd
->transport_sent
, 0);
2420 transport_stop_tasks_for_cmd(cmd
);
2421 transport_generic_request_failure(cmd
, dev
, 0, 1);
2430 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2432 unsigned long flags
;
2434 * Any unsolicited data will get dumped for failed command inside of
2437 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2438 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2439 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2440 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2443 static inline u32
transport_get_sectors_6(
2448 struct se_device
*dev
= cmd
->se_dev
;
2451 * Assume TYPE_DISK for non struct se_device objects.
2452 * Use 8-bit sector value.
2458 * Use 24-bit allocation length for TYPE_TAPE.
2460 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2461 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2464 * Everything else assume TYPE_DISK Sector CDB location.
2465 * Use 8-bit sector value.
2471 static inline u32
transport_get_sectors_10(
2476 struct se_device
*dev
= cmd
->se_dev
;
2479 * Assume TYPE_DISK for non struct se_device objects.
2480 * Use 16-bit sector value.
2486 * XXX_10 is not defined in SSC, throw an exception
2488 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2494 * Everything else assume TYPE_DISK Sector CDB location.
2495 * Use 16-bit sector value.
2498 return (u32
)(cdb
[7] << 8) + cdb
[8];
2501 static inline u32
transport_get_sectors_12(
2506 struct se_device
*dev
= cmd
->se_dev
;
2509 * Assume TYPE_DISK for non struct se_device objects.
2510 * Use 32-bit sector value.
2516 * XXX_12 is not defined in SSC, throw an exception
2518 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2524 * Everything else assume TYPE_DISK Sector CDB location.
2525 * Use 32-bit sector value.
2528 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2531 static inline u32
transport_get_sectors_16(
2536 struct se_device
*dev
= cmd
->se_dev
;
2539 * Assume TYPE_DISK for non struct se_device objects.
2540 * Use 32-bit sector value.
2546 * Use 24-bit allocation length for TYPE_TAPE.
2548 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2549 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2552 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2553 (cdb
[12] << 8) + cdb
[13];
2557 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2559 static inline u32
transport_get_sectors_32(
2565 * Assume TYPE_DISK for non struct se_device objects.
2566 * Use 32-bit sector value.
2568 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2569 (cdb
[30] << 8) + cdb
[31];
2573 static inline u32
transport_get_size(
2578 struct se_device
*dev
= cmd
->se_dev
;
2580 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2581 if (cdb
[1] & 1) { /* sectors */
2582 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2587 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2588 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2589 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2590 dev
->transport
->name
);
2592 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2595 static void transport_xor_callback(struct se_cmd
*cmd
)
2597 unsigned char *buf
, *addr
;
2598 struct scatterlist
*sg
;
2599 unsigned int offset
;
2603 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2605 * 1) read the specified logical block(s);
2606 * 2) transfer logical blocks from the data-out buffer;
2607 * 3) XOR the logical blocks transferred from the data-out buffer with
2608 * the logical blocks read, storing the resulting XOR data in a buffer;
2609 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2610 * blocks transferred from the data-out buffer; and
2611 * 5) transfer the resulting XOR data to the data-in buffer.
2613 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2615 pr_err("Unable to allocate xor_callback buf\n");
2619 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2620 * into the locally allocated *buf
2622 sg_copy_to_buffer(cmd
->t_data_sg
,
2628 * Now perform the XOR against the BIDI read memory located at
2629 * cmd->t_mem_bidi_list
2633 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2634 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2638 for (i
= 0; i
< sg
->length
; i
++)
2639 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2641 offset
+= sg
->length
;
2642 kunmap_atomic(addr
, KM_USER0
);
2650 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2652 static int transport_get_sense_data(struct se_cmd
*cmd
)
2654 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2655 struct se_device
*dev
= cmd
->se_dev
;
2656 struct se_task
*task
= NULL
, *task_tmp
;
2657 unsigned long flags
;
2660 WARN_ON(!cmd
->se_lun
);
2665 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2666 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2667 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2671 list_for_each_entry_safe(task
, task_tmp
,
2672 &cmd
->t_task_list
, t_list
) {
2673 if (!task
->task_sense
)
2676 if (!dev
->transport
->get_sense_buffer
) {
2677 pr_err("dev->transport->get_sense_buffer"
2682 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2683 if (!sense_buffer
) {
2684 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
2685 " sense buffer for task with sense\n",
2686 cmd
->se_tfo
->get_task_tag(cmd
), task
->task_no
);
2689 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2691 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2692 TRANSPORT_SENSE_BUFFER
);
2694 memcpy(&buffer
[offset
], sense_buffer
,
2695 TRANSPORT_SENSE_BUFFER
);
2696 cmd
->scsi_status
= task
->task_scsi_status
;
2697 /* Automatically padded */
2698 cmd
->scsi_sense_length
=
2699 (TRANSPORT_SENSE_BUFFER
+ offset
);
2701 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2703 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2707 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2713 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
2715 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2716 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2717 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2719 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2720 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2723 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2726 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2727 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2728 cmd
->orig_fe_lun
, 0x2C,
2729 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2733 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2735 return dev
->transport
->get_blocks(dev
) + 1;
2738 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2740 struct se_device
*dev
= cmd
->se_dev
;
2743 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2746 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2748 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2749 pr_err("LBA: %llu Sectors: %u exceeds"
2750 " transport_dev_end_lba(): %llu\n",
2751 cmd
->t_task_lba
, sectors
,
2752 transport_dev_end_lba(dev
));
2759 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2762 * Determine if the received WRITE_SAME is used to for direct
2763 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2764 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2765 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2767 int passthrough
= (dev
->transport
->transport_type
==
2768 TRANSPORT_PLUGIN_PHBA_PDEV
);
2771 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2772 pr_err("WRITE_SAME PBDATA and LBDATA"
2773 " bits not supported for Block Discard"
2778 * Currently for the emulated case we only accept
2779 * tpws with the UNMAP=1 bit set.
2781 if (!(flags
[0] & 0x08)) {
2782 pr_err("WRITE_SAME w/o UNMAP bit not"
2783 " supported for Block Discard Emulation\n");
2791 /* transport_generic_cmd_sequencer():
2793 * Generic Command Sequencer that should work for most DAS transport
2796 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2799 * FIXME: Need to support other SCSI OPCODES where as well.
2801 static int transport_generic_cmd_sequencer(
2805 struct se_device
*dev
= cmd
->se_dev
;
2806 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2807 int ret
= 0, sector_ret
= 0, passthrough
;
2808 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2812 * Check for an existing UNIT ATTENTION condition
2814 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2815 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2816 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2820 * Check status of Asymmetric Logical Unit Assignment port
2822 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2825 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2826 * The ALUA additional sense code qualifier (ASCQ) is determined
2827 * by the ALUA primary or secondary access state..
2831 pr_debug("[%s]: ALUA TG Port not available,"
2832 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2833 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2835 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2836 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2837 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2840 goto out_invalid_cdb_field
;
2843 * Check status for SPC-3 Persistent Reservations
2845 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2846 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2847 cmd
, cdb
, pr_reg_type
) != 0)
2848 return transport_handle_reservation_conflict(cmd
);
2850 * This means the CDB is allowed for the SCSI Initiator port
2851 * when said port is *NOT* holding the legacy SPC-2 or
2852 * SPC-3 Persistent Reservation.
2858 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2860 goto out_unsupported_cdb
;
2861 size
= transport_get_size(sectors
, cdb
, cmd
);
2862 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
2863 cmd
->t_task_lba
= transport_lba_21(cdb
);
2864 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2867 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2869 goto out_unsupported_cdb
;
2870 size
= transport_get_size(sectors
, cdb
, cmd
);
2871 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2872 cmd
->t_task_lba
= transport_lba_32(cdb
);
2873 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2876 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2878 goto out_unsupported_cdb
;
2879 size
= transport_get_size(sectors
, cdb
, cmd
);
2880 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
2881 cmd
->t_task_lba
= transport_lba_32(cdb
);
2882 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2885 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2887 goto out_unsupported_cdb
;
2888 size
= transport_get_size(sectors
, cdb
, cmd
);
2889 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
2890 cmd
->t_task_lba
= transport_lba_64(cdb
);
2891 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2894 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2896 goto out_unsupported_cdb
;
2897 size
= transport_get_size(sectors
, cdb
, cmd
);
2898 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
2899 cmd
->t_task_lba
= transport_lba_21(cdb
);
2900 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2903 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2905 goto out_unsupported_cdb
;
2906 size
= transport_get_size(sectors
, cdb
, cmd
);
2907 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2908 cmd
->t_task_lba
= transport_lba_32(cdb
);
2909 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2910 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2913 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2915 goto out_unsupported_cdb
;
2916 size
= transport_get_size(sectors
, cdb
, cmd
);
2917 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
2918 cmd
->t_task_lba
= transport_lba_32(cdb
);
2919 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2920 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2923 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2925 goto out_unsupported_cdb
;
2926 size
= transport_get_size(sectors
, cdb
, cmd
);
2927 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
2928 cmd
->t_task_lba
= transport_lba_64(cdb
);
2929 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2930 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2932 case XDWRITEREAD_10
:
2933 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
2934 !(cmd
->t_tasks_bidi
))
2935 goto out_invalid_cdb_field
;
2936 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2938 goto out_unsupported_cdb
;
2939 size
= transport_get_size(sectors
, cdb
, cmd
);
2940 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2941 cmd
->t_task_lba
= transport_lba_32(cdb
);
2942 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2943 passthrough
= (dev
->transport
->transport_type
==
2944 TRANSPORT_PLUGIN_PHBA_PDEV
);
2946 * Skip the remaining assignments for TCM/PSCSI passthrough
2951 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2953 cmd
->transport_complete_callback
= &transport_xor_callback
;
2954 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2956 case VARIABLE_LENGTH_CMD
:
2957 service_action
= get_unaligned_be16(&cdb
[8]);
2959 * Determine if this is TCM/PSCSI device and we should disable
2960 * internal emulation for this CDB.
2962 passthrough
= (dev
->transport
->transport_type
==
2963 TRANSPORT_PLUGIN_PHBA_PDEV
);
2965 switch (service_action
) {
2966 case XDWRITEREAD_32
:
2967 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2969 goto out_unsupported_cdb
;
2970 size
= transport_get_size(sectors
, cdb
, cmd
);
2972 * Use WRITE_32 and READ_32 opcodes for the emulated
2973 * XDWRITE_READ_32 logic.
2975 cmd
->transport_split_cdb
= &split_cdb_XX_32
;
2976 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
2977 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2980 * Skip the remaining assignments for TCM/PSCSI passthrough
2986 * Setup BIDI XOR callback to be run during
2987 * transport_generic_complete_ok()
2989 cmd
->transport_complete_callback
= &transport_xor_callback
;
2990 cmd
->t_tasks_fua
= (cdb
[10] & 0x8);
2993 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
2995 goto out_unsupported_cdb
;
2998 size
= transport_get_size(1, cdb
, cmd
);
3000 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3002 goto out_invalid_cdb_field
;
3005 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
3006 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3008 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
3009 goto out_invalid_cdb_field
;
3013 pr_err("VARIABLE_LENGTH_CMD service action"
3014 " 0x%04x not supported\n", service_action
);
3015 goto out_unsupported_cdb
;
3018 case MAINTENANCE_IN
:
3019 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3020 /* MAINTENANCE_IN from SCC-2 */
3022 * Check for emulated MI_REPORT_TARGET_PGS.
3024 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
3025 cmd
->transport_emulate_cdb
=
3026 (su_dev
->t10_alua
.alua_type
==
3027 SPC3_ALUA_EMULATED
) ?
3028 core_emulate_report_target_port_groups
:
3031 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3032 (cdb
[8] << 8) | cdb
[9];
3034 /* GPCMD_SEND_KEY from multi media commands */
3035 size
= (cdb
[8] << 8) + cdb
[9];
3037 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3041 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3043 case MODE_SELECT_10
:
3044 size
= (cdb
[7] << 8) + cdb
[8];
3045 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3049 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3052 case GPCMD_READ_BUFFER_CAPACITY
:
3053 case GPCMD_SEND_OPC
:
3056 size
= (cdb
[7] << 8) + cdb
[8];
3057 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3059 case READ_BLOCK_LIMITS
:
3060 size
= READ_BLOCK_LEN
;
3061 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3063 case GPCMD_GET_CONFIGURATION
:
3064 case GPCMD_READ_FORMAT_CAPACITIES
:
3065 case GPCMD_READ_DISC_INFO
:
3066 case GPCMD_READ_TRACK_RZONE_INFO
:
3067 size
= (cdb
[7] << 8) + cdb
[8];
3068 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3070 case PERSISTENT_RESERVE_IN
:
3071 case PERSISTENT_RESERVE_OUT
:
3072 cmd
->transport_emulate_cdb
=
3073 (su_dev
->t10_pr
.res_type
==
3074 SPC3_PERSISTENT_RESERVATIONS
) ?
3075 core_scsi3_emulate_pr
: NULL
;
3076 size
= (cdb
[7] << 8) + cdb
[8];
3077 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3079 case GPCMD_MECHANISM_STATUS
:
3080 case GPCMD_READ_DVD_STRUCTURE
:
3081 size
= (cdb
[8] << 8) + cdb
[9];
3082 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3085 size
= READ_POSITION_LEN
;
3086 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3088 case MAINTENANCE_OUT
:
3089 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3090 /* MAINTENANCE_OUT from SCC-2
3092 * Check for emulated MO_SET_TARGET_PGS.
3094 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3095 cmd
->transport_emulate_cdb
=
3096 (su_dev
->t10_alua
.alua_type
==
3097 SPC3_ALUA_EMULATED
) ?
3098 core_emulate_set_target_port_groups
:
3102 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3103 (cdb
[8] << 8) | cdb
[9];
3105 /* GPCMD_REPORT_KEY from multi media commands */
3106 size
= (cdb
[8] << 8) + cdb
[9];
3108 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3111 size
= (cdb
[3] << 8) + cdb
[4];
3113 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3114 * See spc4r17 section 5.3
3116 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3117 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3118 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3121 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3122 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3125 size
= READ_CAP_LEN
;
3126 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3128 case READ_MEDIA_SERIAL_NUMBER
:
3129 case SECURITY_PROTOCOL_IN
:
3130 case SECURITY_PROTOCOL_OUT
:
3131 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3132 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3134 case SERVICE_ACTION_IN
:
3135 case ACCESS_CONTROL_IN
:
3136 case ACCESS_CONTROL_OUT
:
3138 case READ_ATTRIBUTE
:
3139 case RECEIVE_COPY_RESULTS
:
3140 case WRITE_ATTRIBUTE
:
3141 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3142 (cdb
[12] << 8) | cdb
[13];
3143 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3145 case RECEIVE_DIAGNOSTIC
:
3146 case SEND_DIAGNOSTIC
:
3147 size
= (cdb
[3] << 8) | cdb
[4];
3148 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3150 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3153 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3154 size
= (2336 * sectors
);
3155 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3160 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3164 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3166 case READ_ELEMENT_STATUS
:
3167 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3168 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3171 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3172 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3177 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3178 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3180 if (cdb
[0] == RESERVE_10
)
3181 size
= (cdb
[7] << 8) | cdb
[8];
3183 size
= cmd
->data_length
;
3186 * Setup the legacy emulated handler for SPC-2 and
3187 * >= SPC-3 compatible reservation handling (CRH=1)
3188 * Otherwise, we assume the underlying SCSI logic is
3189 * is running in SPC_PASSTHROUGH, and wants reservations
3190 * emulation disabled.
3192 cmd
->transport_emulate_cdb
=
3193 (su_dev
->t10_pr
.res_type
!=
3195 core_scsi2_emulate_crh
: NULL
;
3196 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3201 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3202 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3204 if (cdb
[0] == RELEASE_10
)
3205 size
= (cdb
[7] << 8) | cdb
[8];
3207 size
= cmd
->data_length
;
3209 cmd
->transport_emulate_cdb
=
3210 (su_dev
->t10_pr
.res_type
!=
3212 core_scsi2_emulate_crh
: NULL
;
3213 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3215 case SYNCHRONIZE_CACHE
:
3216 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3218 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3220 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3221 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3222 cmd
->t_task_lba
= transport_lba_32(cdb
);
3224 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3225 cmd
->t_task_lba
= transport_lba_64(cdb
);
3228 goto out_unsupported_cdb
;
3230 size
= transport_get_size(sectors
, cdb
, cmd
);
3231 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3234 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3236 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3239 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3240 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3242 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3244 * Check to ensure that LBA + Range does not exceed past end of
3245 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3247 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
3248 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3249 goto out_invalid_cdb_field
;
3253 size
= get_unaligned_be16(&cdb
[7]);
3254 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3257 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3259 goto out_unsupported_cdb
;
3262 size
= transport_get_size(1, cdb
, cmd
);
3264 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3265 goto out_invalid_cdb_field
;
3268 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
3269 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3271 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3272 goto out_invalid_cdb_field
;
3275 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3277 goto out_unsupported_cdb
;
3280 size
= transport_get_size(1, cdb
, cmd
);
3282 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3283 goto out_invalid_cdb_field
;
3286 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3287 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3289 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3290 * of byte 1 bit 3 UNMAP instead of original reserved field
3292 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3293 goto out_invalid_cdb_field
;
3295 case ALLOW_MEDIUM_REMOVAL
:
3296 case GPCMD_CLOSE_TRACK
:
3298 case INITIALIZE_ELEMENT_STATUS
:
3299 case GPCMD_LOAD_UNLOAD
:
3302 case GPCMD_SET_SPEED
:
3305 case TEST_UNIT_READY
:
3307 case WRITE_FILEMARKS
:
3309 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3312 cmd
->transport_emulate_cdb
=
3313 transport_core_report_lun_response
;
3314 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3316 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3317 * See spc4r17 section 5.3
3319 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3320 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3321 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3324 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3325 " 0x%02x, sending CHECK_CONDITION.\n",
3326 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3327 goto out_unsupported_cdb
;
3330 if (size
!= cmd
->data_length
) {
3331 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3332 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3333 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3334 cmd
->data_length
, size
, cdb
[0]);
3336 cmd
->cmd_spdtl
= size
;
3338 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3339 pr_err("Rejecting underflow/overflow"
3341 goto out_invalid_cdb_field
;
3344 * Reject READ_* or WRITE_* with overflow/underflow for
3345 * type SCF_SCSI_DATA_SG_IO_CDB.
3347 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3348 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3349 " CDB on non 512-byte sector setup subsystem"
3350 " plugin: %s\n", dev
->transport
->name
);
3351 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3352 goto out_invalid_cdb_field
;
3355 if (size
> cmd
->data_length
) {
3356 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3357 cmd
->residual_count
= (size
- cmd
->data_length
);
3359 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3360 cmd
->residual_count
= (cmd
->data_length
- size
);
3362 cmd
->data_length
= size
;
3365 /* Let's limit control cdbs to a page, for simplicity's sake. */
3366 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3368 goto out_invalid_cdb_field
;
3370 transport_set_supported_SAM_opcode(cmd
);
3373 out_unsupported_cdb
:
3374 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3375 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3377 out_invalid_cdb_field
:
3378 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3379 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3384 * Called from transport_generic_complete_ok() and
3385 * transport_generic_request_failure() to determine which dormant/delayed
3386 * and ordered cmds need to have their tasks added to the execution queue.
3388 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3390 struct se_device
*dev
= cmd
->se_dev
;
3391 struct se_cmd
*cmd_p
, *cmd_tmp
;
3392 int new_active_tasks
= 0;
3394 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3395 atomic_dec(&dev
->simple_cmds
);
3396 smp_mb__after_atomic_dec();
3397 dev
->dev_cur_ordered_id
++;
3398 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3399 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3400 cmd
->se_ordered_id
);
3401 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3402 atomic_dec(&dev
->dev_hoq_count
);
3403 smp_mb__after_atomic_dec();
3404 dev
->dev_cur_ordered_id
++;
3405 pr_debug("Incremented dev_cur_ordered_id: %u for"
3406 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3407 cmd
->se_ordered_id
);
3408 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3409 spin_lock(&dev
->ordered_cmd_lock
);
3410 list_del(&cmd
->se_ordered_node
);
3411 atomic_dec(&dev
->dev_ordered_sync
);
3412 smp_mb__after_atomic_dec();
3413 spin_unlock(&dev
->ordered_cmd_lock
);
3415 dev
->dev_cur_ordered_id
++;
3416 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3417 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3420 * Process all commands up to the last received
3421 * ORDERED task attribute which requires another blocking
3424 spin_lock(&dev
->delayed_cmd_lock
);
3425 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3426 &dev
->delayed_cmd_list
, se_delayed_node
) {
3428 list_del(&cmd_p
->se_delayed_node
);
3429 spin_unlock(&dev
->delayed_cmd_lock
);
3431 pr_debug("Calling add_tasks() for"
3432 " cmd_p: 0x%02x Task Attr: 0x%02x"
3433 " Dormant -> Active, se_ordered_id: %u\n",
3434 cmd_p
->t_task_cdb
[0],
3435 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3437 transport_add_tasks_from_cmd(cmd_p
);
3440 spin_lock(&dev
->delayed_cmd_lock
);
3441 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3444 spin_unlock(&dev
->delayed_cmd_lock
);
3446 * If new tasks have become active, wake up the transport thread
3447 * to do the processing of the Active tasks.
3449 if (new_active_tasks
!= 0)
3450 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3453 static int transport_complete_qf(struct se_cmd
*cmd
)
3457 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
3458 return cmd
->se_tfo
->queue_status(cmd
);
3460 switch (cmd
->data_direction
) {
3461 case DMA_FROM_DEVICE
:
3462 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3465 if (cmd
->t_bidi_data_sg
) {
3466 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3470 /* Fall through for DMA_TO_DEVICE */
3472 ret
= cmd
->se_tfo
->queue_status(cmd
);
3481 static void transport_handle_queue_full(
3483 struct se_device
*dev
,
3484 int (*qf_callback
)(struct se_cmd
*))
3486 spin_lock_irq(&dev
->qf_cmd_lock
);
3487 cmd
->se_cmd_flags
|= SCF_EMULATE_QUEUE_FULL
;
3488 cmd
->transport_qf_callback
= qf_callback
;
3489 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3490 atomic_inc(&dev
->dev_qf_count
);
3491 smp_mb__after_atomic_inc();
3492 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3494 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3497 static void transport_generic_complete_ok(struct se_cmd
*cmd
)
3499 int reason
= 0, ret
;
3501 * Check if we need to move delayed/dormant tasks from cmds on the
3502 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3505 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3506 transport_complete_task_attr(cmd
);
3508 * Check to schedule QUEUE_FULL work, or execute an existing
3509 * cmd->transport_qf_callback()
3511 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3512 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3514 if (cmd
->transport_qf_callback
) {
3515 ret
= cmd
->transport_qf_callback(cmd
);
3519 cmd
->transport_qf_callback
= NULL
;
3523 * Check if we need to retrieve a sense buffer from
3524 * the struct se_cmd in question.
3526 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3527 if (transport_get_sense_data(cmd
) < 0)
3528 reason
= TCM_NON_EXISTENT_LUN
;
3531 * Only set when an struct se_task->task_scsi_status returned
3532 * a non GOOD status.
3534 if (cmd
->scsi_status
) {
3535 ret
= transport_send_check_condition_and_sense(
3540 transport_lun_remove_cmd(cmd
);
3541 transport_cmd_check_stop_to_fabric(cmd
);
3546 * Check for a callback, used by amongst other things
3547 * XDWRITE_READ_10 emulation.
3549 if (cmd
->transport_complete_callback
)
3550 cmd
->transport_complete_callback(cmd
);
3552 switch (cmd
->data_direction
) {
3553 case DMA_FROM_DEVICE
:
3554 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3555 if (cmd
->se_lun
->lun_sep
) {
3556 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3559 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3561 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3566 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3567 if (cmd
->se_lun
->lun_sep
) {
3568 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3571 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3573 * Check if we need to send READ payload for BIDI-COMMAND
3575 if (cmd
->t_bidi_data_sg
) {
3576 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3577 if (cmd
->se_lun
->lun_sep
) {
3578 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3581 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3582 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3587 /* Fall through for DMA_TO_DEVICE */
3589 ret
= cmd
->se_tfo
->queue_status(cmd
);
3598 transport_lun_remove_cmd(cmd
);
3599 transport_cmd_check_stop_to_fabric(cmd
);
3603 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3604 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3605 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
3608 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3610 struct se_task
*task
, *task_tmp
;
3611 unsigned long flags
;
3613 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3614 list_for_each_entry_safe(task
, task_tmp
,
3615 &cmd
->t_task_list
, t_list
) {
3616 if (task
->task_flags
& TF_ACTIVE
)
3619 kfree(task
->task_sg_bidi
);
3620 kfree(task
->task_sg
);
3622 list_del(&task
->t_list
);
3624 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3625 cmd
->se_dev
->transport
->free_task(task
);
3626 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3628 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3631 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3633 struct scatterlist
*sg
;
3636 for_each_sg(sgl
, sg
, nents
, count
)
3637 __free_page(sg_page(sg
));
3642 static inline void transport_free_pages(struct se_cmd
*cmd
)
3644 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3647 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3648 cmd
->t_data_sg
= NULL
;
3649 cmd
->t_data_nents
= 0;
3651 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3652 cmd
->t_bidi_data_sg
= NULL
;
3653 cmd
->t_bidi_data_nents
= 0;
3657 * transport_put_cmd - release a reference to a command
3658 * @cmd: command to release
3660 * This routine releases our reference to the command and frees it if possible.
3662 static void transport_put_cmd(struct se_cmd
*cmd
)
3664 unsigned long flags
;
3667 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3668 if (atomic_read(&cmd
->t_fe_count
)) {
3669 if (!atomic_dec_and_test(&cmd
->t_fe_count
))
3673 if (atomic_read(&cmd
->t_se_count
)) {
3674 if (!atomic_dec_and_test(&cmd
->t_se_count
))
3678 if (atomic_read(&cmd
->transport_dev_active
)) {
3679 atomic_set(&cmd
->transport_dev_active
, 0);
3680 transport_all_task_dev_remove_state(cmd
);
3683 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3685 if (free_tasks
!= 0)
3686 transport_free_dev_tasks(cmd
);
3688 transport_free_pages(cmd
);
3689 transport_release_cmd(cmd
);
3692 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3696 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3697 * allocating in the core.
3698 * @cmd: Associated se_cmd descriptor
3699 * @mem: SGL style memory for TCM WRITE / READ
3700 * @sg_mem_num: Number of SGL elements
3701 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3702 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3704 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3707 int transport_generic_map_mem_to_cmd(
3709 struct scatterlist
*sgl
,
3711 struct scatterlist
*sgl_bidi
,
3714 if (!sgl
|| !sgl_count
)
3717 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3718 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3720 cmd
->t_data_sg
= sgl
;
3721 cmd
->t_data_nents
= sgl_count
;
3723 if (sgl_bidi
&& sgl_bidi_count
) {
3724 cmd
->t_bidi_data_sg
= sgl_bidi
;
3725 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3727 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3732 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3734 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
3736 struct se_device
*dev
= cmd
->se_dev
;
3737 int set_counts
= 1, rc
, task_cdbs
;
3740 * Setup any BIDI READ tasks and memory from
3741 * cmd->t_mem_bidi_list so the READ struct se_tasks
3742 * are queued first for the non pSCSI passthrough case.
3744 if (cmd
->t_bidi_data_sg
&&
3745 (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
3746 rc
= transport_allocate_tasks(cmd
,
3749 cmd
->t_bidi_data_sg
,
3750 cmd
->t_bidi_data_nents
);
3752 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3753 cmd
->scsi_sense_reason
=
3754 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3757 atomic_inc(&cmd
->t_fe_count
);
3758 atomic_inc(&cmd
->t_se_count
);
3762 * Setup the tasks and memory from cmd->t_mem_list
3763 * Note for BIDI transfers this will contain the WRITE payload
3765 task_cdbs
= transport_allocate_tasks(cmd
,
3767 cmd
->data_direction
,
3770 if (task_cdbs
<= 0) {
3771 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3772 cmd
->scsi_sense_reason
=
3773 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3778 atomic_inc(&cmd
->t_fe_count
);
3779 atomic_inc(&cmd
->t_se_count
);
3782 cmd
->t_task_list_num
= task_cdbs
;
3784 atomic_set(&cmd
->t_task_cdbs_left
, task_cdbs
);
3785 atomic_set(&cmd
->t_task_cdbs_ex_left
, task_cdbs
);
3786 atomic_set(&cmd
->t_task_cdbs_timeout_left
, task_cdbs
);
3790 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3792 struct scatterlist
*sg
= cmd
->t_data_sg
;
3796 * We need to take into account a possible offset here for fabrics like
3797 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3798 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3800 return kmap(sg_page(sg
)) + sg
->offset
;
3802 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3804 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3806 kunmap(sg_page(cmd
->t_data_sg
));
3808 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3811 transport_generic_get_mem(struct se_cmd
*cmd
)
3813 u32 length
= cmd
->data_length
;
3818 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3819 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3820 if (!cmd
->t_data_sg
)
3823 cmd
->t_data_nents
= nents
;
3824 sg_init_table(cmd
->t_data_sg
, nents
);
3827 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3828 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3832 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3840 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3843 kfree(cmd
->t_data_sg
);
3844 cmd
->t_data_sg
= NULL
;
3848 /* Reduce sectors if they are too long for the device */
3849 static inline sector_t
transport_limit_task_sectors(
3850 struct se_device
*dev
,
3851 unsigned long long lba
,
3854 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3856 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3857 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3858 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
3865 * This function can be used by HW target mode drivers to create a linked
3866 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3867 * This is intended to be called during the completion path by TCM Core
3868 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3870 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
3872 struct scatterlist
*sg_first
= NULL
;
3873 struct scatterlist
*sg_prev
= NULL
;
3874 int sg_prev_nents
= 0;
3875 struct scatterlist
*sg
;
3876 struct se_task
*task
;
3877 u32 chained_nents
= 0;
3880 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
3883 * Walk the struct se_task list and setup scatterlist chains
3884 * for each contiguously allocated struct se_task->task_sg[].
3886 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
3891 sg_first
= task
->task_sg
;
3892 chained_nents
= task
->task_sg_nents
;
3894 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
3895 chained_nents
+= task
->task_sg_nents
;
3898 * For the padded tasks, use the extra SGL vector allocated
3899 * in transport_allocate_data_tasks() for the sg_prev_nents
3900 * offset into sg_chain() above.. The last task of a
3901 * multi-task list, or a single task will not have
3902 * task->task_sg_padded set..
3904 if (task
->task_padded_sg
)
3905 sg_prev_nents
= (task
->task_sg_nents
+ 1);
3907 sg_prev_nents
= task
->task_sg_nents
;
3909 sg_prev
= task
->task_sg
;
3912 * Setup the starting pointer and total t_tasks_sg_linked_no including
3913 * padding SGs for linking and to mark the end.
3915 cmd
->t_tasks_sg_chained
= sg_first
;
3916 cmd
->t_tasks_sg_chained_no
= chained_nents
;
3918 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3919 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
3920 cmd
->t_tasks_sg_chained_no
);
3922 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
3923 cmd
->t_tasks_sg_chained_no
, i
) {
3925 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3926 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
3927 if (sg_is_chain(sg
))
3928 pr_debug("SG: %p sg_is_chain=1\n", sg
);
3930 pr_debug("SG: %p sg_is_last=1\n", sg
);
3933 EXPORT_SYMBOL(transport_do_task_sg_chain
);
3936 * Break up cmd into chunks transport can handle
3938 static int transport_allocate_data_tasks(
3940 unsigned long long lba
,
3941 enum dma_data_direction data_direction
,
3942 struct scatterlist
*sgl
,
3943 unsigned int sgl_nents
)
3945 unsigned char *cdb
= NULL
;
3946 struct se_task
*task
;
3947 struct se_device
*dev
= cmd
->se_dev
;
3948 unsigned long flags
;
3950 sector_t sectors
, dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
3951 u32 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
3952 struct scatterlist
*sg
;
3953 struct scatterlist
*cmd_sg
;
3955 WARN_ON(cmd
->data_length
% sector_size
);
3956 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
3957 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
3960 for (i
= 0; i
< task_count
; i
++) {
3961 unsigned int task_size
, task_sg_nents_padded
;
3964 task
= transport_generic_get_task(cmd
, data_direction
);
3968 task
->task_lba
= lba
;
3969 task
->task_sectors
= min(sectors
, dev_max_sectors
);
3970 task
->task_size
= task
->task_sectors
* sector_size
;
3972 cdb
= dev
->transport
->get_cdb(task
);
3975 memcpy(cdb
, cmd
->t_task_cdb
,
3976 scsi_command_size(cmd
->t_task_cdb
));
3978 /* Update new cdb with updated lba/sectors */
3979 cmd
->transport_split_cdb(task
->task_lba
, task
->task_sectors
, cdb
);
3981 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3982 * in order to calculate the number per task SGL entries
3984 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
3986 * Check if the fabric module driver is requesting that all
3987 * struct se_task->task_sg[] be chained together.. If so,
3988 * then allocate an extra padding SG entry for linking and
3989 * marking the end of the chained SGL for every task except
3990 * the last one for (task_count > 1) operation, or skipping
3991 * the extra padding for the (task_count == 1) case.
3993 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
3994 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
3995 task
->task_padded_sg
= 1;
3997 task_sg_nents_padded
= task
->task_sg_nents
;
3999 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
4000 task_sg_nents_padded
, GFP_KERNEL
);
4001 if (!task
->task_sg
) {
4002 cmd
->se_dev
->transport
->free_task(task
);
4006 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
4008 task_size
= task
->task_size
;
4010 /* Build new sgl, only up to task_size */
4011 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
4012 if (cmd_sg
->length
> task_size
)
4016 task_size
-= cmd_sg
->length
;
4017 cmd_sg
= sg_next(cmd_sg
);
4020 lba
+= task
->task_sectors
;
4021 sectors
-= task
->task_sectors
;
4023 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4024 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4025 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4032 transport_allocate_control_task(struct se_cmd
*cmd
)
4034 struct se_device
*dev
= cmd
->se_dev
;
4036 struct se_task
*task
;
4037 unsigned long flags
;
4039 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
4043 cdb
= dev
->transport
->get_cdb(task
);
4045 memcpy(cdb
, cmd
->t_task_cdb
,
4046 scsi_command_size(cmd
->t_task_cdb
));
4048 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
4050 if (!task
->task_sg
) {
4051 cmd
->se_dev
->transport
->free_task(task
);
4055 memcpy(task
->task_sg
, cmd
->t_data_sg
,
4056 sizeof(struct scatterlist
) * cmd
->t_data_nents
);
4057 task
->task_size
= cmd
->data_length
;
4058 task
->task_sg_nents
= cmd
->t_data_nents
;
4060 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4061 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4062 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4064 /* Success! Return number of tasks allocated */
4068 static u32
transport_allocate_tasks(
4070 unsigned long long lba
,
4071 enum dma_data_direction data_direction
,
4072 struct scatterlist
*sgl
,
4073 unsigned int sgl_nents
)
4075 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
4076 if (transport_cmd_get_valid_sectors(cmd
) < 0)
4079 return transport_allocate_data_tasks(cmd
, lba
, data_direction
,
4082 return transport_allocate_control_task(cmd
);
4087 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4089 * Allocate storage transport resources from a set of values predefined
4090 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4091 * Any non zero return here is treated as an "out of resource' op here.
4094 * Generate struct se_task(s) and/or their payloads for this CDB.
4096 int transport_generic_new_cmd(struct se_cmd
*cmd
)
4101 * Determine is the TCM fabric module has already allocated physical
4102 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4105 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
4107 ret
= transport_generic_get_mem(cmd
);
4112 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4113 * control or data CDB types, and perform the map to backend subsystem
4114 * code from SGL memory allocated here by transport_generic_get_mem(), or
4115 * via pre-existing SGL memory setup explictly by fabric module code with
4116 * transport_generic_map_mem_to_cmd().
4118 ret
= transport_new_cmd_obj(cmd
);
4122 * For WRITEs, let the fabric know its buffer is ready..
4123 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4124 * will be added to the struct se_device execution queue after its WRITE
4125 * data has arrived. (ie: It gets handled by the transport processing
4126 * thread a second time)
4128 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4129 transport_add_tasks_to_state_queue(cmd
);
4130 return transport_generic_write_pending(cmd
);
4133 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4134 * to the execution queue.
4136 transport_execute_tasks(cmd
);
4139 EXPORT_SYMBOL(transport_generic_new_cmd
);
4141 /* transport_generic_process_write():
4145 void transport_generic_process_write(struct se_cmd
*cmd
)
4147 transport_execute_tasks(cmd
);
4149 EXPORT_SYMBOL(transport_generic_process_write
);
4151 static int transport_write_pending_qf(struct se_cmd
*cmd
)
4153 return cmd
->se_tfo
->write_pending(cmd
);
4156 /* transport_generic_write_pending():
4160 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4162 unsigned long flags
;
4165 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4166 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4167 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4169 if (cmd
->transport_qf_callback
) {
4170 ret
= cmd
->transport_qf_callback(cmd
);
4176 cmd
->transport_qf_callback
= NULL
;
4181 * Clear the se_cmd for WRITE_PENDING status in order to set
4182 * cmd->t_transport_active=0 so that transport_generic_handle_data
4183 * can be called from HW target mode interrupt code. This is safe
4184 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4185 * because the se_cmd->se_lun pointer is not being cleared.
4187 transport_cmd_check_stop(cmd
, 1, 0);
4190 * Call the fabric write_pending function here to let the
4191 * frontend know that WRITE buffers are ready.
4193 ret
= cmd
->se_tfo
->write_pending(cmd
);
4199 return PYX_TRANSPORT_WRITE_PENDING
;
4202 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4203 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4204 transport_handle_queue_full(cmd
, cmd
->se_dev
,
4205 transport_write_pending_qf
);
4210 * transport_release_cmd - free a command
4211 * @cmd: command to free
4213 * This routine unconditionally frees a command, and reference counting
4214 * or list removal must be done in the caller.
4216 void transport_release_cmd(struct se_cmd
*cmd
)
4218 BUG_ON(!cmd
->se_tfo
);
4220 if (cmd
->se_tmr_req
)
4221 core_tmr_release_req(cmd
->se_tmr_req
);
4222 if (cmd
->t_task_cdb
!= cmd
->__t_task_cdb
)
4223 kfree(cmd
->t_task_cdb
);
4224 cmd
->se_tfo
->release_cmd(cmd
);
4226 EXPORT_SYMBOL(transport_release_cmd
);
4228 void transport_generic_free_cmd(struct se_cmd
*cmd
, int wait_for_tasks
)
4230 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
)) {
4231 if (wait_for_tasks
&& cmd
->se_tmr_req
)
4232 transport_wait_for_tasks(cmd
);
4234 transport_release_cmd(cmd
);
4237 transport_wait_for_tasks(cmd
);
4239 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4242 transport_lun_remove_cmd(cmd
);
4244 transport_free_dev_tasks(cmd
);
4246 transport_put_cmd(cmd
);
4249 EXPORT_SYMBOL(transport_generic_free_cmd
);
4251 /* transport_lun_wait_for_tasks():
4253 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4254 * an struct se_lun to be successfully shutdown.
4256 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4258 unsigned long flags
;
4261 * If the frontend has already requested this struct se_cmd to
4262 * be stopped, we can safely ignore this struct se_cmd.
4264 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4265 if (atomic_read(&cmd
->t_transport_stop
)) {
4266 atomic_set(&cmd
->transport_lun_stop
, 0);
4267 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4268 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4269 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4270 transport_cmd_check_stop(cmd
, 1, 0);
4273 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4274 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4276 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4278 ret
= transport_stop_tasks_for_cmd(cmd
);
4280 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4281 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4283 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4284 cmd
->se_tfo
->get_task_tag(cmd
));
4285 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4286 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4287 cmd
->se_tfo
->get_task_tag(cmd
));
4289 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
4294 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4296 struct se_cmd
*cmd
= NULL
;
4297 unsigned long lun_flags
, cmd_flags
;
4299 * Do exception processing and return CHECK_CONDITION status to the
4302 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4303 while (!list_empty(&lun
->lun_cmd_list
)) {
4304 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4305 struct se_cmd
, se_lun_node
);
4306 list_del(&cmd
->se_lun_node
);
4308 atomic_set(&cmd
->transport_lun_active
, 0);
4310 * This will notify iscsi_target_transport.c:
4311 * transport_cmd_check_stop() that a LUN shutdown is in
4312 * progress for the iscsi_cmd_t.
4314 spin_lock(&cmd
->t_state_lock
);
4315 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4316 "_lun_stop for ITT: 0x%08x\n",
4317 cmd
->se_lun
->unpacked_lun
,
4318 cmd
->se_tfo
->get_task_tag(cmd
));
4319 atomic_set(&cmd
->transport_lun_stop
, 1);
4320 spin_unlock(&cmd
->t_state_lock
);
4322 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4325 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4326 cmd
->se_tfo
->get_task_tag(cmd
),
4327 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4331 * If the Storage engine still owns the iscsi_cmd_t, determine
4332 * and/or stop its context.
4334 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4335 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4336 cmd
->se_tfo
->get_task_tag(cmd
));
4338 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4339 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4343 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4344 "_wait_for_tasks(): SUCCESS\n",
4345 cmd
->se_lun
->unpacked_lun
,
4346 cmd
->se_tfo
->get_task_tag(cmd
));
4348 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4349 if (!atomic_read(&cmd
->transport_dev_active
)) {
4350 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4353 atomic_set(&cmd
->transport_dev_active
, 0);
4354 transport_all_task_dev_remove_state(cmd
);
4355 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4357 transport_free_dev_tasks(cmd
);
4359 * The Storage engine stopped this struct se_cmd before it was
4360 * send to the fabric frontend for delivery back to the
4361 * Initiator Node. Return this SCSI CDB back with an
4362 * CHECK_CONDITION status.
4365 transport_send_check_condition_and_sense(cmd
,
4366 TCM_NON_EXISTENT_LUN
, 0);
4368 * If the fabric frontend is waiting for this iscsi_cmd_t to
4369 * be released, notify the waiting thread now that LU has
4370 * finished accessing it.
4372 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4373 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4374 pr_debug("SE_LUN[%d] - Detected FE stop for"
4375 " struct se_cmd: %p ITT: 0x%08x\n",
4377 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4379 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4381 transport_cmd_check_stop(cmd
, 1, 0);
4382 complete(&cmd
->transport_lun_fe_stop_comp
);
4383 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4386 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4387 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4389 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4390 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4392 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4395 static int transport_clear_lun_thread(void *p
)
4397 struct se_lun
*lun
= (struct se_lun
*)p
;
4399 __transport_clear_lun_from_sessions(lun
);
4400 complete(&lun
->lun_shutdown_comp
);
4405 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4407 struct task_struct
*kt
;
4409 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4410 "tcm_cl_%u", lun
->unpacked_lun
);
4412 pr_err("Unable to start clear_lun thread\n");
4415 wait_for_completion(&lun
->lun_shutdown_comp
);
4421 * transport_wait_for_tasks - wait for completion to occur
4422 * @cmd: command to wait
4424 * Called from frontend fabric context to wait for storage engine
4425 * to pause and/or release frontend generated struct se_cmd.
4427 void transport_wait_for_tasks(struct se_cmd
*cmd
)
4429 unsigned long flags
;
4431 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4432 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
)) {
4433 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4437 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4438 * has been set in transport_set_supported_SAM_opcode().
4440 if (!(cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) && !cmd
->se_tmr_req
) {
4441 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4445 * If we are already stopped due to an external event (ie: LUN shutdown)
4446 * sleep until the connection can have the passed struct se_cmd back.
4447 * The cmd->transport_lun_stopped_sem will be upped by
4448 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4449 * has completed its operation on the struct se_cmd.
4451 if (atomic_read(&cmd
->transport_lun_stop
)) {
4453 pr_debug("wait_for_tasks: Stopping"
4454 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4455 "_stop_comp); for ITT: 0x%08x\n",
4456 cmd
->se_tfo
->get_task_tag(cmd
));
4458 * There is a special case for WRITES where a FE exception +
4459 * LUN shutdown means ConfigFS context is still sleeping on
4460 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4461 * We go ahead and up transport_lun_stop_comp just to be sure
4464 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4465 complete(&cmd
->transport_lun_stop_comp
);
4466 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4467 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4469 transport_all_task_dev_remove_state(cmd
);
4471 * At this point, the frontend who was the originator of this
4472 * struct se_cmd, now owns the structure and can be released through
4473 * normal means below.
4475 pr_debug("wait_for_tasks: Stopped"
4476 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4477 "stop_comp); for ITT: 0x%08x\n",
4478 cmd
->se_tfo
->get_task_tag(cmd
));
4480 atomic_set(&cmd
->transport_lun_stop
, 0);
4482 if (!atomic_read(&cmd
->t_transport_active
) ||
4483 atomic_read(&cmd
->t_transport_aborted
)) {
4484 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4488 atomic_set(&cmd
->t_transport_stop
, 1);
4490 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4491 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4492 " = TRUE\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4493 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
,
4494 cmd
->deferred_t_state
);
4496 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4498 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4500 wait_for_completion(&cmd
->t_transport_stop_comp
);
4502 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4503 atomic_set(&cmd
->t_transport_active
, 0);
4504 atomic_set(&cmd
->t_transport_stop
, 0);
4506 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4507 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4508 cmd
->se_tfo
->get_task_tag(cmd
));
4510 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4512 EXPORT_SYMBOL(transport_wait_for_tasks
);
4514 static int transport_get_sense_codes(
4519 *asc
= cmd
->scsi_asc
;
4520 *ascq
= cmd
->scsi_ascq
;
4525 static int transport_set_sense_codes(
4530 cmd
->scsi_asc
= asc
;
4531 cmd
->scsi_ascq
= ascq
;
4536 int transport_send_check_condition_and_sense(
4541 unsigned char *buffer
= cmd
->sense_buffer
;
4542 unsigned long flags
;
4544 u8 asc
= 0, ascq
= 0;
4546 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4547 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4548 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4551 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4552 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4554 if (!reason
&& from_transport
)
4557 if (!from_transport
)
4558 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4560 * Data Segment and SenseLength of the fabric response PDU.
4562 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4563 * from include/scsi/scsi_cmnd.h
4565 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4566 TRANSPORT_SENSE_BUFFER
);
4568 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4569 * SENSE KEY values from include/scsi/scsi.h
4572 case TCM_NON_EXISTENT_LUN
:
4574 buffer
[offset
] = 0x70;
4575 /* ILLEGAL REQUEST */
4576 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4577 /* LOGICAL UNIT NOT SUPPORTED */
4578 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4580 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4581 case TCM_SECTOR_COUNT_TOO_MANY
:
4583 buffer
[offset
] = 0x70;
4584 /* ILLEGAL REQUEST */
4585 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4586 /* INVALID COMMAND OPERATION CODE */
4587 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4589 case TCM_UNKNOWN_MODE_PAGE
:
4591 buffer
[offset
] = 0x70;
4592 /* ILLEGAL REQUEST */
4593 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4594 /* INVALID FIELD IN CDB */
4595 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4597 case TCM_CHECK_CONDITION_ABORT_CMD
:
4599 buffer
[offset
] = 0x70;
4600 /* ABORTED COMMAND */
4601 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4602 /* BUS DEVICE RESET FUNCTION OCCURRED */
4603 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4604 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4606 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4608 buffer
[offset
] = 0x70;
4609 /* ABORTED COMMAND */
4610 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4612 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4613 /* NOT ENOUGH UNSOLICITED DATA */
4614 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4616 case TCM_INVALID_CDB_FIELD
:
4618 buffer
[offset
] = 0x70;
4619 /* ABORTED COMMAND */
4620 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4621 /* INVALID FIELD IN CDB */
4622 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4624 case TCM_INVALID_PARAMETER_LIST
:
4626 buffer
[offset
] = 0x70;
4627 /* ABORTED COMMAND */
4628 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4629 /* INVALID FIELD IN PARAMETER LIST */
4630 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4632 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4634 buffer
[offset
] = 0x70;
4635 /* ABORTED COMMAND */
4636 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4638 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4639 /* UNEXPECTED_UNSOLICITED_DATA */
4640 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4642 case TCM_SERVICE_CRC_ERROR
:
4644 buffer
[offset
] = 0x70;
4645 /* ABORTED COMMAND */
4646 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4647 /* PROTOCOL SERVICE CRC ERROR */
4648 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4650 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4652 case TCM_SNACK_REJECTED
:
4654 buffer
[offset
] = 0x70;
4655 /* ABORTED COMMAND */
4656 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4658 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4659 /* FAILED RETRANSMISSION REQUEST */
4660 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4662 case TCM_WRITE_PROTECTED
:
4664 buffer
[offset
] = 0x70;
4666 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4667 /* WRITE PROTECTED */
4668 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4670 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4672 buffer
[offset
] = 0x70;
4673 /* UNIT ATTENTION */
4674 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4675 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4676 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4677 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4679 case TCM_CHECK_CONDITION_NOT_READY
:
4681 buffer
[offset
] = 0x70;
4683 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4684 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4685 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4686 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4688 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4691 buffer
[offset
] = 0x70;
4692 /* ILLEGAL REQUEST */
4693 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4694 /* LOGICAL UNIT COMMUNICATION FAILURE */
4695 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4699 * This code uses linux/include/scsi/scsi.h SAM status codes!
4701 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4703 * Automatically padded, this value is encoded in the fabric's
4704 * data_length response PDU containing the SCSI defined sense data.
4706 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4709 return cmd
->se_tfo
->queue_status(cmd
);
4711 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4713 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4717 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4719 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4722 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4723 " status for CDB: 0x%02x ITT: 0x%08x\n",
4725 cmd
->se_tfo
->get_task_tag(cmd
));
4727 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4728 cmd
->se_tfo
->queue_status(cmd
);
4733 EXPORT_SYMBOL(transport_check_aborted_status
);
4735 void transport_send_task_abort(struct se_cmd
*cmd
)
4737 unsigned long flags
;
4739 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4740 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4741 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4744 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4747 * If there are still expected incoming fabric WRITEs, we wait
4748 * until until they have completed before sending a TASK_ABORTED
4749 * response. This response with TASK_ABORTED status will be
4750 * queued back to fabric module by transport_check_aborted_status().
4752 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4753 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4754 atomic_inc(&cmd
->t_transport_aborted
);
4755 smp_mb__after_atomic_inc();
4756 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4757 transport_new_cmd_failure(cmd
);
4761 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4763 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4764 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4765 cmd
->se_tfo
->get_task_tag(cmd
));
4767 cmd
->se_tfo
->queue_status(cmd
);
4770 /* transport_generic_do_tmr():
4774 int transport_generic_do_tmr(struct se_cmd
*cmd
)
4776 struct se_device
*dev
= cmd
->se_dev
;
4777 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4780 switch (tmr
->function
) {
4781 case TMR_ABORT_TASK
:
4782 tmr
->response
= TMR_FUNCTION_REJECTED
;
4784 case TMR_ABORT_TASK_SET
:
4786 case TMR_CLEAR_TASK_SET
:
4787 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4790 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4791 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4792 TMR_FUNCTION_REJECTED
;
4794 case TMR_TARGET_WARM_RESET
:
4795 tmr
->response
= TMR_FUNCTION_REJECTED
;
4797 case TMR_TARGET_COLD_RESET
:
4798 tmr
->response
= TMR_FUNCTION_REJECTED
;
4801 pr_err("Uknown TMR function: 0x%02x.\n",
4803 tmr
->response
= TMR_FUNCTION_REJECTED
;
4807 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4808 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4810 transport_cmd_check_stop(cmd
, 2, 0);
4814 /* transport_processing_thread():
4818 static int transport_processing_thread(void *param
)
4822 struct se_device
*dev
= (struct se_device
*) param
;
4824 set_user_nice(current
, -20);
4826 while (!kthread_should_stop()) {
4827 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
4828 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
4829 kthread_should_stop());
4834 __transport_execute_tasks(dev
);
4836 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
4840 switch (cmd
->t_state
) {
4841 case TRANSPORT_NEW_CMD
:
4844 case TRANSPORT_NEW_CMD_MAP
:
4845 if (!cmd
->se_tfo
->new_cmd_map
) {
4846 pr_err("cmd->se_tfo->new_cmd_map is"
4847 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4850 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
4852 cmd
->transport_error_status
= ret
;
4853 transport_generic_request_failure(cmd
, NULL
,
4854 0, (cmd
->data_direction
!=
4858 ret
= transport_generic_new_cmd(cmd
);
4862 cmd
->transport_error_status
= ret
;
4863 transport_generic_request_failure(cmd
, NULL
,
4864 0, (cmd
->data_direction
!=
4868 case TRANSPORT_PROCESS_WRITE
:
4869 transport_generic_process_write(cmd
);
4871 case TRANSPORT_COMPLETE_OK
:
4872 transport_stop_all_task_timers(cmd
);
4873 transport_generic_complete_ok(cmd
);
4875 case TRANSPORT_REMOVE
:
4876 transport_put_cmd(cmd
);
4878 case TRANSPORT_FREE_CMD_INTR
:
4879 transport_generic_free_cmd(cmd
, 0);
4881 case TRANSPORT_PROCESS_TMR
:
4882 transport_generic_do_tmr(cmd
);
4884 case TRANSPORT_COMPLETE_FAILURE
:
4885 transport_generic_request_failure(cmd
, NULL
, 1, 1);
4887 case TRANSPORT_COMPLETE_TIMEOUT
:
4888 transport_stop_all_task_timers(cmd
);
4889 transport_generic_request_timeout(cmd
);
4891 case TRANSPORT_COMPLETE_QF_WP
:
4892 transport_generic_write_pending(cmd
);
4895 pr_err("Unknown t_state: %d deferred_t_state:"
4896 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
4897 " %u\n", cmd
->t_state
, cmd
->deferred_t_state
,
4898 cmd
->se_tfo
->get_task_tag(cmd
),
4899 cmd
->se_tfo
->get_cmd_state(cmd
),
4900 cmd
->se_lun
->unpacked_lun
);
4908 WARN_ON(!list_empty(&dev
->state_task_list
));
4909 WARN_ON(!list_empty(&dev
->dev_queue_obj
.qobj_list
));
4910 dev
->process_thread
= NULL
;