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 /* Used for transport_dev_get_map_*() */
73 typedef int (*map_func_t
)(struct se_task
*, u32
);
75 static int transport_generic_write_pending(struct se_cmd
*);
76 static int transport_processing_thread(void *param
);
77 static int __transport_execute_tasks(struct se_device
*dev
);
78 static void transport_complete_task_attr(struct se_cmd
*cmd
);
79 static int transport_complete_qf(struct se_cmd
*cmd
);
80 static void transport_handle_queue_full(struct se_cmd
*cmd
,
81 struct se_device
*dev
, int (*qf_callback
)(struct se_cmd
*));
82 static void transport_direct_request_timeout(struct se_cmd
*cmd
);
83 static void transport_free_dev_tasks(struct se_cmd
*cmd
);
84 static u32
transport_allocate_tasks(struct se_cmd
*cmd
,
85 unsigned long long starting_lba
,
86 enum dma_data_direction data_direction
,
87 struct scatterlist
*sgl
, unsigned int nents
);
88 static int transport_generic_get_mem(struct se_cmd
*cmd
);
89 static int transport_generic_remove(struct se_cmd
*cmd
,
90 int session_reinstatement
);
91 static void transport_release_fe_cmd(struct se_cmd
*cmd
);
92 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
93 struct se_queue_obj
*qobj
);
94 static int transport_set_sense_codes(struct se_cmd
*cmd
, u8 asc
, u8 ascq
);
95 static void transport_stop_all_task_timers(struct se_cmd
*cmd
);
97 int init_se_kmem_caches(void)
99 se_cmd_cache
= kmem_cache_create("se_cmd_cache",
100 sizeof(struct se_cmd
), __alignof__(struct se_cmd
), 0, NULL
);
102 pr_err("kmem_cache_create for struct se_cmd failed\n");
105 se_tmr_req_cache
= kmem_cache_create("se_tmr_cache",
106 sizeof(struct se_tmr_req
), __alignof__(struct se_tmr_req
),
108 if (!se_tmr_req_cache
) {
109 pr_err("kmem_cache_create() for struct se_tmr_req"
113 se_sess_cache
= kmem_cache_create("se_sess_cache",
114 sizeof(struct se_session
), __alignof__(struct se_session
),
116 if (!se_sess_cache
) {
117 pr_err("kmem_cache_create() for struct se_session"
121 se_ua_cache
= kmem_cache_create("se_ua_cache",
122 sizeof(struct se_ua
), __alignof__(struct se_ua
),
125 pr_err("kmem_cache_create() for struct se_ua failed\n");
128 t10_pr_reg_cache
= kmem_cache_create("t10_pr_reg_cache",
129 sizeof(struct t10_pr_registration
),
130 __alignof__(struct t10_pr_registration
), 0, NULL
);
131 if (!t10_pr_reg_cache
) {
132 pr_err("kmem_cache_create() for struct t10_pr_registration"
136 t10_alua_lu_gp_cache
= kmem_cache_create("t10_alua_lu_gp_cache",
137 sizeof(struct t10_alua_lu_gp
), __alignof__(struct t10_alua_lu_gp
),
139 if (!t10_alua_lu_gp_cache
) {
140 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
144 t10_alua_lu_gp_mem_cache
= kmem_cache_create("t10_alua_lu_gp_mem_cache",
145 sizeof(struct t10_alua_lu_gp_member
),
146 __alignof__(struct t10_alua_lu_gp_member
), 0, NULL
);
147 if (!t10_alua_lu_gp_mem_cache
) {
148 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
152 t10_alua_tg_pt_gp_cache
= kmem_cache_create("t10_alua_tg_pt_gp_cache",
153 sizeof(struct t10_alua_tg_pt_gp
),
154 __alignof__(struct t10_alua_tg_pt_gp
), 0, NULL
);
155 if (!t10_alua_tg_pt_gp_cache
) {
156 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
160 t10_alua_tg_pt_gp_mem_cache
= kmem_cache_create(
161 "t10_alua_tg_pt_gp_mem_cache",
162 sizeof(struct t10_alua_tg_pt_gp_member
),
163 __alignof__(struct t10_alua_tg_pt_gp_member
),
165 if (!t10_alua_tg_pt_gp_mem_cache
) {
166 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
174 kmem_cache_destroy(se_cmd_cache
);
175 if (se_tmr_req_cache
)
176 kmem_cache_destroy(se_tmr_req_cache
);
178 kmem_cache_destroy(se_sess_cache
);
180 kmem_cache_destroy(se_ua_cache
);
181 if (t10_pr_reg_cache
)
182 kmem_cache_destroy(t10_pr_reg_cache
);
183 if (t10_alua_lu_gp_cache
)
184 kmem_cache_destroy(t10_alua_lu_gp_cache
);
185 if (t10_alua_lu_gp_mem_cache
)
186 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
187 if (t10_alua_tg_pt_gp_cache
)
188 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
189 if (t10_alua_tg_pt_gp_mem_cache
)
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
194 void release_se_kmem_caches(void)
196 kmem_cache_destroy(se_cmd_cache
);
197 kmem_cache_destroy(se_tmr_req_cache
);
198 kmem_cache_destroy(se_sess_cache
);
199 kmem_cache_destroy(se_ua_cache
);
200 kmem_cache_destroy(t10_pr_reg_cache
);
201 kmem_cache_destroy(t10_alua_lu_gp_cache
);
202 kmem_cache_destroy(t10_alua_lu_gp_mem_cache
);
203 kmem_cache_destroy(t10_alua_tg_pt_gp_cache
);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache
);
207 /* This code ensures unique mib indexes are handed out. */
208 static DEFINE_SPINLOCK(scsi_mib_index_lock
);
209 static u32 scsi_mib_index
[SCSI_INDEX_TYPE_MAX
];
212 * Allocate a new row index for the entry type specified
214 u32
scsi_get_new_index(scsi_index_t type
)
218 BUG_ON((type
< 0) || (type
>= SCSI_INDEX_TYPE_MAX
));
220 spin_lock(&scsi_mib_index_lock
);
221 new_index
= ++scsi_mib_index
[type
];
222 spin_unlock(&scsi_mib_index_lock
);
227 void transport_init_queue_obj(struct se_queue_obj
*qobj
)
229 atomic_set(&qobj
->queue_cnt
, 0);
230 INIT_LIST_HEAD(&qobj
->qobj_list
);
231 init_waitqueue_head(&qobj
->thread_wq
);
232 spin_lock_init(&qobj
->cmd_queue_lock
);
234 EXPORT_SYMBOL(transport_init_queue_obj
);
236 static int transport_subsystem_reqmods(void)
240 ret
= request_module("target_core_iblock");
242 pr_err("Unable to load target_core_iblock\n");
244 ret
= request_module("target_core_file");
246 pr_err("Unable to load target_core_file\n");
248 ret
= request_module("target_core_pscsi");
250 pr_err("Unable to load target_core_pscsi\n");
252 ret
= request_module("target_core_stgt");
254 pr_err("Unable to load target_core_stgt\n");
259 int transport_subsystem_check_init(void)
263 if (sub_api_initialized
)
266 * Request the loading of known TCM subsystem plugins..
268 ret
= transport_subsystem_reqmods();
272 sub_api_initialized
= 1;
276 struct se_session
*transport_init_session(void)
278 struct se_session
*se_sess
;
280 se_sess
= kmem_cache_zalloc(se_sess_cache
, GFP_KERNEL
);
282 pr_err("Unable to allocate struct se_session from"
284 return ERR_PTR(-ENOMEM
);
286 INIT_LIST_HEAD(&se_sess
->sess_list
);
287 INIT_LIST_HEAD(&se_sess
->sess_acl_list
);
291 EXPORT_SYMBOL(transport_init_session
);
294 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
296 void __transport_register_session(
297 struct se_portal_group
*se_tpg
,
298 struct se_node_acl
*se_nacl
,
299 struct se_session
*se_sess
,
300 void *fabric_sess_ptr
)
302 unsigned char buf
[PR_REG_ISID_LEN
];
304 se_sess
->se_tpg
= se_tpg
;
305 se_sess
->fabric_sess_ptr
= fabric_sess_ptr
;
307 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
309 * Only set for struct se_session's that will actually be moving I/O.
310 * eg: *NOT* discovery sessions.
314 * If the fabric module supports an ISID based TransportID,
315 * save this value in binary from the fabric I_T Nexus now.
317 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
318 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
319 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
,
320 &buf
[0], PR_REG_ISID_LEN
);
321 se_sess
->sess_bin_isid
= get_unaligned_be64(&buf
[0]);
323 spin_lock_irq(&se_nacl
->nacl_sess_lock
);
325 * The se_nacl->nacl_sess pointer will be set to the
326 * last active I_T Nexus for each struct se_node_acl.
328 se_nacl
->nacl_sess
= se_sess
;
330 list_add_tail(&se_sess
->sess_acl_list
,
331 &se_nacl
->acl_sess_list
);
332 spin_unlock_irq(&se_nacl
->nacl_sess_lock
);
334 list_add_tail(&se_sess
->sess_list
, &se_tpg
->tpg_sess_list
);
336 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
337 se_tpg
->se_tpg_tfo
->get_fabric_name(), se_sess
->fabric_sess_ptr
);
339 EXPORT_SYMBOL(__transport_register_session
);
341 void transport_register_session(
342 struct se_portal_group
*se_tpg
,
343 struct se_node_acl
*se_nacl
,
344 struct se_session
*se_sess
,
345 void *fabric_sess_ptr
)
347 spin_lock_bh(&se_tpg
->session_lock
);
348 __transport_register_session(se_tpg
, se_nacl
, se_sess
, fabric_sess_ptr
);
349 spin_unlock_bh(&se_tpg
->session_lock
);
351 EXPORT_SYMBOL(transport_register_session
);
353 void transport_deregister_session_configfs(struct se_session
*se_sess
)
355 struct se_node_acl
*se_nacl
;
358 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
360 se_nacl
= se_sess
->se_node_acl
;
362 spin_lock_irqsave(&se_nacl
->nacl_sess_lock
, flags
);
363 list_del(&se_sess
->sess_acl_list
);
365 * If the session list is empty, then clear the pointer.
366 * Otherwise, set the struct se_session pointer from the tail
367 * element of the per struct se_node_acl active session list.
369 if (list_empty(&se_nacl
->acl_sess_list
))
370 se_nacl
->nacl_sess
= NULL
;
372 se_nacl
->nacl_sess
= container_of(
373 se_nacl
->acl_sess_list
.prev
,
374 struct se_session
, sess_acl_list
);
376 spin_unlock_irqrestore(&se_nacl
->nacl_sess_lock
, flags
);
379 EXPORT_SYMBOL(transport_deregister_session_configfs
);
381 void transport_free_session(struct se_session
*se_sess
)
383 kmem_cache_free(se_sess_cache
, se_sess
);
385 EXPORT_SYMBOL(transport_free_session
);
387 void transport_deregister_session(struct se_session
*se_sess
)
389 struct se_portal_group
*se_tpg
= se_sess
->se_tpg
;
390 struct se_node_acl
*se_nacl
;
394 transport_free_session(se_sess
);
398 spin_lock_irqsave(&se_tpg
->session_lock
, flags
);
399 list_del(&se_sess
->sess_list
);
400 se_sess
->se_tpg
= NULL
;
401 se_sess
->fabric_sess_ptr
= NULL
;
402 spin_unlock_irqrestore(&se_tpg
->session_lock
, flags
);
405 * Determine if we need to do extra work for this initiator node's
406 * struct se_node_acl if it had been previously dynamically generated.
408 se_nacl
= se_sess
->se_node_acl
;
410 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
411 if (se_nacl
->dynamic_node_acl
) {
412 if (!se_tpg
->se_tpg_tfo
->tpg_check_demo_mode_cache(
414 list_del(&se_nacl
->acl_list
);
415 se_tpg
->num_node_acls
--;
416 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
418 core_tpg_wait_for_nacl_pr_ref(se_nacl
);
419 core_free_device_list_for_node(se_nacl
, se_tpg
);
420 se_tpg
->se_tpg_tfo
->tpg_release_fabric_acl(se_tpg
,
422 spin_lock_irqsave(&se_tpg
->acl_node_lock
, flags
);
425 spin_unlock_irqrestore(&se_tpg
->acl_node_lock
, flags
);
428 transport_free_session(se_sess
);
430 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
431 se_tpg
->se_tpg_tfo
->get_fabric_name());
433 EXPORT_SYMBOL(transport_deregister_session
);
436 * Called with cmd->t_state_lock held.
438 static void transport_all_task_dev_remove_state(struct se_cmd
*cmd
)
440 struct se_device
*dev
;
441 struct se_task
*task
;
444 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
449 if (atomic_read(&task
->task_active
))
452 if (!atomic_read(&task
->task_state_active
))
455 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
456 list_del(&task
->t_state_list
);
457 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
458 cmd
->se_tfo
->get_task_tag(cmd
), dev
, task
);
459 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
461 atomic_set(&task
->task_state_active
, 0);
462 atomic_dec(&cmd
->t_task_cdbs_ex_left
);
466 /* transport_cmd_check_stop():
468 * 'transport_off = 1' determines if t_transport_active should be cleared.
469 * 'transport_off = 2' determines if task_dev_state should be removed.
471 * A non-zero u8 t_state sets cmd->t_state.
472 * Returns 1 when command is stopped, else 0.
474 static int transport_cmd_check_stop(
481 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
483 * Determine if IOCTL context caller in requesting the stopping of this
484 * command for LUN shutdown purposes.
486 if (atomic_read(&cmd
->transport_lun_stop
)) {
487 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
488 " == TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
489 cmd
->se_tfo
->get_task_tag(cmd
));
491 cmd
->deferred_t_state
= cmd
->t_state
;
492 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
493 atomic_set(&cmd
->t_transport_active
, 0);
494 if (transport_off
== 2)
495 transport_all_task_dev_remove_state(cmd
);
496 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
498 complete(&cmd
->transport_lun_stop_comp
);
502 * Determine if frontend context caller is requesting the stopping of
503 * this command for frontend exceptions.
505 if (atomic_read(&cmd
->t_transport_stop
)) {
506 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
507 " TRUE for ITT: 0x%08x\n", __func__
, __LINE__
,
508 cmd
->se_tfo
->get_task_tag(cmd
));
510 cmd
->deferred_t_state
= cmd
->t_state
;
511 cmd
->t_state
= TRANSPORT_DEFERRED_CMD
;
512 if (transport_off
== 2)
513 transport_all_task_dev_remove_state(cmd
);
516 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
519 if (transport_off
== 2)
521 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
523 complete(&cmd
->t_transport_stop_comp
);
527 atomic_set(&cmd
->t_transport_active
, 0);
528 if (transport_off
== 2) {
529 transport_all_task_dev_remove_state(cmd
);
531 * Clear struct se_cmd->se_lun before the transport_off == 2
532 * handoff to fabric module.
536 * Some fabric modules like tcm_loop can release
537 * their internally allocated I/O reference now and
540 if (cmd
->se_tfo
->check_stop_free
!= NULL
) {
541 spin_unlock_irqrestore(
542 &cmd
->t_state_lock
, flags
);
544 cmd
->se_tfo
->check_stop_free(cmd
);
548 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
552 cmd
->t_state
= t_state
;
553 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
558 static int transport_cmd_check_stop_to_fabric(struct se_cmd
*cmd
)
560 return transport_cmd_check_stop(cmd
, 2, 0);
563 static void transport_lun_remove_cmd(struct se_cmd
*cmd
)
565 struct se_lun
*lun
= cmd
->se_lun
;
571 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
572 if (!atomic_read(&cmd
->transport_dev_active
)) {
573 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
576 atomic_set(&cmd
->transport_dev_active
, 0);
577 transport_all_task_dev_remove_state(cmd
);
578 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
582 spin_lock_irqsave(&lun
->lun_cmd_lock
, flags
);
583 if (atomic_read(&cmd
->transport_lun_active
)) {
584 list_del(&cmd
->se_lun_node
);
585 atomic_set(&cmd
->transport_lun_active
, 0);
587 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
588 cmd
->se_tfo
->get_task_tag(cmd
), lun
->unpacked_lun
);
591 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, flags
);
594 void transport_cmd_finish_abort(struct se_cmd
*cmd
, int remove
)
596 transport_lun_remove_cmd(cmd
);
598 if (transport_cmd_check_stop_to_fabric(cmd
))
601 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
602 transport_generic_remove(cmd
, 0);
606 void transport_cmd_finish_abort_tmr(struct se_cmd
*cmd
)
608 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
610 if (transport_cmd_check_stop_to_fabric(cmd
))
613 transport_generic_remove(cmd
, 0);
616 static void transport_add_cmd_to_queue(
620 struct se_device
*dev
= cmd
->se_dev
;
621 struct se_queue_obj
*qobj
= &dev
->dev_queue_obj
;
625 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
626 cmd
->t_state
= t_state
;
627 atomic_set(&cmd
->t_transport_active
, 1);
628 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
631 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
633 /* If the cmd is already on the list, remove it before we add it */
634 if (!list_empty(&cmd
->se_queue_node
))
635 list_del(&cmd
->se_queue_node
);
637 atomic_inc(&qobj
->queue_cnt
);
639 if (cmd
->se_cmd_flags
& SCF_EMULATE_QUEUE_FULL
) {
640 cmd
->se_cmd_flags
&= ~SCF_EMULATE_QUEUE_FULL
;
641 list_add(&cmd
->se_queue_node
, &qobj
->qobj_list
);
643 list_add_tail(&cmd
->se_queue_node
, &qobj
->qobj_list
);
644 atomic_set(&cmd
->t_transport_queue_active
, 1);
645 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
647 wake_up_interruptible(&qobj
->thread_wq
);
650 static struct se_cmd
*
651 transport_get_cmd_from_queue(struct se_queue_obj
*qobj
)
656 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
657 if (list_empty(&qobj
->qobj_list
)) {
658 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
661 cmd
= list_first_entry(&qobj
->qobj_list
, struct se_cmd
, se_queue_node
);
663 atomic_set(&cmd
->t_transport_queue_active
, 0);
665 list_del_init(&cmd
->se_queue_node
);
666 atomic_dec(&qobj
->queue_cnt
);
667 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
672 static void transport_remove_cmd_from_queue(struct se_cmd
*cmd
,
673 struct se_queue_obj
*qobj
)
677 spin_lock_irqsave(&qobj
->cmd_queue_lock
, flags
);
678 if (!atomic_read(&cmd
->t_transport_queue_active
)) {
679 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
682 atomic_set(&cmd
->t_transport_queue_active
, 0);
683 atomic_dec(&qobj
->queue_cnt
);
684 list_del_init(&cmd
->se_queue_node
);
685 spin_unlock_irqrestore(&qobj
->cmd_queue_lock
, flags
);
687 if (atomic_read(&cmd
->t_transport_queue_active
)) {
688 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
689 cmd
->se_tfo
->get_task_tag(cmd
),
690 atomic_read(&cmd
->t_transport_queue_active
));
695 * Completion function used by TCM subsystem plugins (such as FILEIO)
696 * for queueing up response from struct se_subsystem_api->do_task()
698 void transport_complete_sync_cache(struct se_cmd
*cmd
, int good
)
700 struct se_task
*task
= list_entry(cmd
->t_task_list
.next
,
701 struct se_task
, t_list
);
704 cmd
->scsi_status
= SAM_STAT_GOOD
;
705 task
->task_scsi_status
= GOOD
;
707 task
->task_scsi_status
= SAM_STAT_CHECK_CONDITION
;
708 task
->task_error_status
= PYX_TRANSPORT_ILLEGAL_REQUEST
;
709 task
->task_se_cmd
->transport_error_status
=
710 PYX_TRANSPORT_ILLEGAL_REQUEST
;
713 transport_complete_task(task
, good
);
715 EXPORT_SYMBOL(transport_complete_sync_cache
);
717 /* transport_complete_task():
719 * Called from interrupt and non interrupt context depending
720 * on the transport plugin.
722 void transport_complete_task(struct se_task
*task
, int success
)
724 struct se_cmd
*cmd
= task
->task_se_cmd
;
725 struct se_device
*dev
= task
->se_dev
;
729 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task
,
730 cmd
->t_task_cdb
[0], dev
);
733 atomic_inc(&dev
->depth_left
);
735 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
736 atomic_set(&task
->task_active
, 0);
739 * See if any sense data exists, if so set the TASK_SENSE flag.
740 * Also check for any other post completion work that needs to be
741 * done by the plugins.
743 if (dev
&& dev
->transport
->transport_complete
) {
744 if (dev
->transport
->transport_complete(task
) != 0) {
745 cmd
->se_cmd_flags
|= SCF_TRANSPORT_TASK_SENSE
;
746 task
->task_sense
= 1;
752 * See if we are waiting for outstanding struct se_task
753 * to complete for an exception condition
755 if (atomic_read(&task
->task_stop
)) {
757 * Decrement cmd->t_se_count if this task had
758 * previously thrown its timeout exception handler.
760 if (atomic_read(&task
->task_timeout
)) {
761 atomic_dec(&cmd
->t_se_count
);
762 atomic_set(&task
->task_timeout
, 0);
764 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
766 complete(&task
->task_stop_comp
);
770 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
771 * left counter to determine when the struct se_cmd is ready to be queued to
772 * the processing thread.
774 if (atomic_read(&task
->task_timeout
)) {
775 if (!atomic_dec_and_test(
776 &cmd
->t_task_cdbs_timeout_left
)) {
777 spin_unlock_irqrestore(&cmd
->t_state_lock
,
781 t_state
= TRANSPORT_COMPLETE_TIMEOUT
;
782 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
784 transport_add_cmd_to_queue(cmd
, t_state
);
787 atomic_dec(&cmd
->t_task_cdbs_timeout_left
);
790 * Decrement the outstanding t_task_cdbs_left count. The last
791 * struct se_task from struct se_cmd will complete itself into the
792 * device queue depending upon int success.
794 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
796 cmd
->t_tasks_failed
= 1;
798 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
802 if (!success
|| cmd
->t_tasks_failed
) {
803 t_state
= TRANSPORT_COMPLETE_FAILURE
;
804 if (!task
->task_error_status
) {
805 task
->task_error_status
=
806 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
807 cmd
->transport_error_status
=
808 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
811 atomic_set(&cmd
->t_transport_complete
, 1);
812 t_state
= TRANSPORT_COMPLETE_OK
;
814 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
816 transport_add_cmd_to_queue(cmd
, t_state
);
818 EXPORT_SYMBOL(transport_complete_task
);
821 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
822 * struct se_task list are ready to be added to the active execution list
825 * Called with se_dev_t->execute_task_lock called.
827 static inline int transport_add_task_check_sam_attr(
828 struct se_task
*task
,
829 struct se_task
*task_prev
,
830 struct se_device
*dev
)
833 * No SAM Task attribute emulation enabled, add to tail of
836 if (dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
) {
837 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
841 * HEAD_OF_QUEUE attribute for received CDB, which means
842 * the first task that is associated with a struct se_cmd goes to
843 * head of the struct se_device->execute_task_list, and task_prev
844 * after that for each subsequent task
846 if (task
->task_se_cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
847 list_add(&task
->t_execute_list
,
848 (task_prev
!= NULL
) ?
849 &task_prev
->t_execute_list
:
850 &dev
->execute_task_list
);
852 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
853 " in execution queue\n",
854 task
->task_se_cmd
->t_task_cdb
[0]);
858 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
859 * transitioned from Dermant -> Active state, and are added to the end
860 * of the struct se_device->execute_task_list
862 list_add_tail(&task
->t_execute_list
, &dev
->execute_task_list
);
866 /* __transport_add_task_to_execute_queue():
868 * Called with se_dev_t->execute_task_lock called.
870 static void __transport_add_task_to_execute_queue(
871 struct se_task
*task
,
872 struct se_task
*task_prev
,
873 struct se_device
*dev
)
877 head_of_queue
= transport_add_task_check_sam_attr(task
, task_prev
, dev
);
878 atomic_inc(&dev
->execute_tasks
);
880 if (atomic_read(&task
->task_state_active
))
883 * Determine if this task needs to go to HEAD_OF_QUEUE for the
884 * state list as well. Running with SAM Task Attribute emulation
885 * will always return head_of_queue == 0 here
888 list_add(&task
->t_state_list
, (task_prev
) ?
889 &task_prev
->t_state_list
:
890 &dev
->state_task_list
);
892 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
894 atomic_set(&task
->task_state_active
, 1);
896 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
897 task
->task_se_cmd
->se_tfo
->get_task_tag(task
->task_se_cmd
),
901 static void transport_add_tasks_to_state_queue(struct se_cmd
*cmd
)
903 struct se_device
*dev
;
904 struct se_task
*task
;
907 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
908 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
911 if (atomic_read(&task
->task_state_active
))
914 spin_lock(&dev
->execute_task_lock
);
915 list_add_tail(&task
->t_state_list
, &dev
->state_task_list
);
916 atomic_set(&task
->task_state_active
, 1);
918 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
919 task
->task_se_cmd
->se_tfo
->get_task_tag(
920 task
->task_se_cmd
), task
, dev
);
922 spin_unlock(&dev
->execute_task_lock
);
924 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
927 static void transport_add_tasks_from_cmd(struct se_cmd
*cmd
)
929 struct se_device
*dev
= cmd
->se_dev
;
930 struct se_task
*task
, *task_prev
= NULL
;
933 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
934 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
935 if (atomic_read(&task
->task_execute_queue
))
938 * __transport_add_task_to_execute_queue() handles the
939 * SAM Task Attribute emulation if enabled
941 __transport_add_task_to_execute_queue(task
, task_prev
, dev
);
942 atomic_set(&task
->task_execute_queue
, 1);
945 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
948 /* transport_remove_task_from_execute_queue():
952 void transport_remove_task_from_execute_queue(
953 struct se_task
*task
,
954 struct se_device
*dev
)
958 if (atomic_read(&task
->task_execute_queue
) == 0) {
963 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
964 list_del(&task
->t_execute_list
);
965 atomic_set(&task
->task_execute_queue
, 0);
966 atomic_dec(&dev
->execute_tasks
);
967 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
971 * Handle QUEUE_FULL / -EAGAIN status
974 static void target_qf_do_work(struct work_struct
*work
)
976 struct se_device
*dev
= container_of(work
, struct se_device
,
978 LIST_HEAD(qf_cmd_list
);
979 struct se_cmd
*cmd
, *cmd_tmp
;
981 spin_lock_irq(&dev
->qf_cmd_lock
);
982 list_splice_init(&dev
->qf_cmd_list
, &qf_cmd_list
);
983 spin_unlock_irq(&dev
->qf_cmd_lock
);
985 list_for_each_entry_safe(cmd
, cmd_tmp
, &qf_cmd_list
, se_qf_node
) {
986 list_del(&cmd
->se_qf_node
);
987 atomic_dec(&dev
->dev_qf_count
);
988 smp_mb__after_atomic_dec();
990 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
991 " context: %s\n", cmd
->se_tfo
->get_fabric_name(), cmd
,
992 (cmd
->t_state
== TRANSPORT_COMPLETE_OK
) ? "COMPLETE_OK" :
993 (cmd
->t_state
== TRANSPORT_COMPLETE_QF_WP
) ? "WRITE_PENDING"
996 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
997 * has been added to head of queue
999 transport_add_cmd_to_queue(cmd
, cmd
->t_state
);
1003 unsigned char *transport_dump_cmd_direction(struct se_cmd
*cmd
)
1005 switch (cmd
->data_direction
) {
1008 case DMA_FROM_DEVICE
:
1012 case DMA_BIDIRECTIONAL
:
1021 void transport_dump_dev_state(
1022 struct se_device
*dev
,
1026 *bl
+= sprintf(b
+ *bl
, "Status: ");
1027 switch (dev
->dev_status
) {
1028 case TRANSPORT_DEVICE_ACTIVATED
:
1029 *bl
+= sprintf(b
+ *bl
, "ACTIVATED");
1031 case TRANSPORT_DEVICE_DEACTIVATED
:
1032 *bl
+= sprintf(b
+ *bl
, "DEACTIVATED");
1034 case TRANSPORT_DEVICE_SHUTDOWN
:
1035 *bl
+= sprintf(b
+ *bl
, "SHUTDOWN");
1037 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED
:
1038 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED
:
1039 *bl
+= sprintf(b
+ *bl
, "OFFLINE");
1042 *bl
+= sprintf(b
+ *bl
, "UNKNOWN=%d", dev
->dev_status
);
1046 *bl
+= sprintf(b
+ *bl
, " Execute/Left/Max Queue Depth: %d/%d/%d",
1047 atomic_read(&dev
->execute_tasks
), atomic_read(&dev
->depth_left
),
1049 *bl
+= sprintf(b
+ *bl
, " SectorSize: %u MaxSectors: %u\n",
1050 dev
->se_sub_dev
->se_dev_attrib
.block_size
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
1051 *bl
+= sprintf(b
+ *bl
, " ");
1054 /* transport_release_all_cmds():
1058 static void transport_release_all_cmds(struct se_device
*dev
)
1060 struct se_cmd
*cmd
, *tcmd
;
1061 int bug_out
= 0, t_state
;
1062 unsigned long flags
;
1064 spin_lock_irqsave(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1065 list_for_each_entry_safe(cmd
, tcmd
, &dev
->dev_queue_obj
.qobj_list
,
1067 t_state
= cmd
->t_state
;
1068 list_del_init(&cmd
->se_queue_node
);
1069 spin_unlock_irqrestore(&dev
->dev_queue_obj
.cmd_queue_lock
,
1072 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
1073 " t_state: %u directly\n",
1074 cmd
->se_tfo
->get_task_tag(cmd
),
1075 cmd
->se_tfo
->get_cmd_state(cmd
), t_state
);
1077 transport_release_fe_cmd(cmd
);
1080 spin_lock_irqsave(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1082 spin_unlock_irqrestore(&dev
->dev_queue_obj
.cmd_queue_lock
, flags
);
1089 void transport_dump_vpd_proto_id(
1090 struct t10_vpd
*vpd
,
1091 unsigned char *p_buf
,
1094 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1097 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1098 len
= sprintf(buf
, "T10 VPD Protocol Identifier: ");
1100 switch (vpd
->protocol_identifier
) {
1102 sprintf(buf
+len
, "Fibre Channel\n");
1105 sprintf(buf
+len
, "Parallel SCSI\n");
1108 sprintf(buf
+len
, "SSA\n");
1111 sprintf(buf
+len
, "IEEE 1394\n");
1114 sprintf(buf
+len
, "SCSI Remote Direct Memory Access"
1118 sprintf(buf
+len
, "Internet SCSI (iSCSI)\n");
1121 sprintf(buf
+len
, "SAS Serial SCSI Protocol\n");
1124 sprintf(buf
+len
, "Automation/Drive Interface Transport"
1128 sprintf(buf
+len
, "AT Attachment Interface ATA/ATAPI\n");
1131 sprintf(buf
+len
, "Unknown 0x%02x\n",
1132 vpd
->protocol_identifier
);
1137 strncpy(p_buf
, buf
, p_buf_len
);
1139 pr_debug("%s", buf
);
1143 transport_set_vpd_proto_id(struct t10_vpd
*vpd
, unsigned char *page_83
)
1146 * Check if the Protocol Identifier Valid (PIV) bit is set..
1148 * from spc3r23.pdf section 7.5.1
1150 if (page_83
[1] & 0x80) {
1151 vpd
->protocol_identifier
= (page_83
[0] & 0xf0);
1152 vpd
->protocol_identifier_set
= 1;
1153 transport_dump_vpd_proto_id(vpd
, NULL
, 0);
1156 EXPORT_SYMBOL(transport_set_vpd_proto_id
);
1158 int transport_dump_vpd_assoc(
1159 struct t10_vpd
*vpd
,
1160 unsigned char *p_buf
,
1163 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1167 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1168 len
= sprintf(buf
, "T10 VPD Identifier Association: ");
1170 switch (vpd
->association
) {
1172 sprintf(buf
+len
, "addressed logical unit\n");
1175 sprintf(buf
+len
, "target port\n");
1178 sprintf(buf
+len
, "SCSI target device\n");
1181 sprintf(buf
+len
, "Unknown 0x%02x\n", vpd
->association
);
1187 strncpy(p_buf
, buf
, p_buf_len
);
1189 pr_debug("%s", buf
);
1194 int transport_set_vpd_assoc(struct t10_vpd
*vpd
, unsigned char *page_83
)
1197 * The VPD identification association..
1199 * from spc3r23.pdf Section 7.6.3.1 Table 297
1201 vpd
->association
= (page_83
[1] & 0x30);
1202 return transport_dump_vpd_assoc(vpd
, NULL
, 0);
1204 EXPORT_SYMBOL(transport_set_vpd_assoc
);
1206 int transport_dump_vpd_ident_type(
1207 struct t10_vpd
*vpd
,
1208 unsigned char *p_buf
,
1211 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1215 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1216 len
= sprintf(buf
, "T10 VPD Identifier Type: ");
1218 switch (vpd
->device_identifier_type
) {
1220 sprintf(buf
+len
, "Vendor specific\n");
1223 sprintf(buf
+len
, "T10 Vendor ID based\n");
1226 sprintf(buf
+len
, "EUI-64 based\n");
1229 sprintf(buf
+len
, "NAA\n");
1232 sprintf(buf
+len
, "Relative target port identifier\n");
1235 sprintf(buf
+len
, "SCSI name string\n");
1238 sprintf(buf
+len
, "Unsupported: 0x%02x\n",
1239 vpd
->device_identifier_type
);
1245 if (p_buf_len
< strlen(buf
)+1)
1247 strncpy(p_buf
, buf
, p_buf_len
);
1249 pr_debug("%s", buf
);
1255 int transport_set_vpd_ident_type(struct t10_vpd
*vpd
, unsigned char *page_83
)
1258 * The VPD identifier type..
1260 * from spc3r23.pdf Section 7.6.3.1 Table 298
1262 vpd
->device_identifier_type
= (page_83
[1] & 0x0f);
1263 return transport_dump_vpd_ident_type(vpd
, NULL
, 0);
1265 EXPORT_SYMBOL(transport_set_vpd_ident_type
);
1267 int transport_dump_vpd_ident(
1268 struct t10_vpd
*vpd
,
1269 unsigned char *p_buf
,
1272 unsigned char buf
[VPD_TMP_BUF_SIZE
];
1275 memset(buf
, 0, VPD_TMP_BUF_SIZE
);
1277 switch (vpd
->device_identifier_code_set
) {
1278 case 0x01: /* Binary */
1279 sprintf(buf
, "T10 VPD Binary Device Identifier: %s\n",
1280 &vpd
->device_identifier
[0]);
1282 case 0x02: /* ASCII */
1283 sprintf(buf
, "T10 VPD ASCII Device Identifier: %s\n",
1284 &vpd
->device_identifier
[0]);
1286 case 0x03: /* UTF-8 */
1287 sprintf(buf
, "T10 VPD UTF-8 Device Identifier: %s\n",
1288 &vpd
->device_identifier
[0]);
1291 sprintf(buf
, "T10 VPD Device Identifier encoding unsupported:"
1292 " 0x%02x", vpd
->device_identifier_code_set
);
1298 strncpy(p_buf
, buf
, p_buf_len
);
1300 pr_debug("%s", buf
);
1306 transport_set_vpd_ident(struct t10_vpd
*vpd
, unsigned char *page_83
)
1308 static const char hex_str
[] = "0123456789abcdef";
1309 int j
= 0, i
= 4; /* offset to start of the identifer */
1312 * The VPD Code Set (encoding)
1314 * from spc3r23.pdf Section 7.6.3.1 Table 296
1316 vpd
->device_identifier_code_set
= (page_83
[0] & 0x0f);
1317 switch (vpd
->device_identifier_code_set
) {
1318 case 0x01: /* Binary */
1319 vpd
->device_identifier
[j
++] =
1320 hex_str
[vpd
->device_identifier_type
];
1321 while (i
< (4 + page_83
[3])) {
1322 vpd
->device_identifier
[j
++] =
1323 hex_str
[(page_83
[i
] & 0xf0) >> 4];
1324 vpd
->device_identifier
[j
++] =
1325 hex_str
[page_83
[i
] & 0x0f];
1329 case 0x02: /* ASCII */
1330 case 0x03: /* UTF-8 */
1331 while (i
< (4 + page_83
[3]))
1332 vpd
->device_identifier
[j
++] = page_83
[i
++];
1338 return transport_dump_vpd_ident(vpd
, NULL
, 0);
1340 EXPORT_SYMBOL(transport_set_vpd_ident
);
1342 static void core_setup_task_attr_emulation(struct se_device
*dev
)
1345 * If this device is from Target_Core_Mod/pSCSI, disable the
1346 * SAM Task Attribute emulation.
1348 * This is currently not available in upsream Linux/SCSI Target
1349 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1351 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) {
1352 dev
->dev_task_attr_type
= SAM_TASK_ATTR_PASSTHROUGH
;
1356 dev
->dev_task_attr_type
= SAM_TASK_ATTR_EMULATED
;
1357 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1358 " device\n", dev
->transport
->name
,
1359 dev
->transport
->get_device_rev(dev
));
1362 static void scsi_dump_inquiry(struct se_device
*dev
)
1364 struct t10_wwn
*wwn
= &dev
->se_sub_dev
->t10_wwn
;
1367 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1369 pr_debug(" Vendor: ");
1370 for (i
= 0; i
< 8; i
++)
1371 if (wwn
->vendor
[i
] >= 0x20)
1372 pr_debug("%c", wwn
->vendor
[i
]);
1376 pr_debug(" Model: ");
1377 for (i
= 0; i
< 16; i
++)
1378 if (wwn
->model
[i
] >= 0x20)
1379 pr_debug("%c", wwn
->model
[i
]);
1383 pr_debug(" Revision: ");
1384 for (i
= 0; i
< 4; i
++)
1385 if (wwn
->revision
[i
] >= 0x20)
1386 pr_debug("%c", wwn
->revision
[i
]);
1392 device_type
= dev
->transport
->get_device_type(dev
);
1393 pr_debug(" Type: %s ", scsi_device_type(device_type
));
1394 pr_debug(" ANSI SCSI revision: %02x\n",
1395 dev
->transport
->get_device_rev(dev
));
1398 struct se_device
*transport_add_device_to_core_hba(
1400 struct se_subsystem_api
*transport
,
1401 struct se_subsystem_dev
*se_dev
,
1403 void *transport_dev
,
1404 struct se_dev_limits
*dev_limits
,
1405 const char *inquiry_prod
,
1406 const char *inquiry_rev
)
1409 struct se_device
*dev
;
1411 dev
= kzalloc(sizeof(struct se_device
), GFP_KERNEL
);
1413 pr_err("Unable to allocate memory for se_dev_t\n");
1417 transport_init_queue_obj(&dev
->dev_queue_obj
);
1418 dev
->dev_flags
= device_flags
;
1419 dev
->dev_status
|= TRANSPORT_DEVICE_DEACTIVATED
;
1420 dev
->dev_ptr
= transport_dev
;
1422 dev
->se_sub_dev
= se_dev
;
1423 dev
->transport
= transport
;
1424 atomic_set(&dev
->active_cmds
, 0);
1425 INIT_LIST_HEAD(&dev
->dev_list
);
1426 INIT_LIST_HEAD(&dev
->dev_sep_list
);
1427 INIT_LIST_HEAD(&dev
->dev_tmr_list
);
1428 INIT_LIST_HEAD(&dev
->execute_task_list
);
1429 INIT_LIST_HEAD(&dev
->delayed_cmd_list
);
1430 INIT_LIST_HEAD(&dev
->ordered_cmd_list
);
1431 INIT_LIST_HEAD(&dev
->state_task_list
);
1432 INIT_LIST_HEAD(&dev
->qf_cmd_list
);
1433 spin_lock_init(&dev
->execute_task_lock
);
1434 spin_lock_init(&dev
->delayed_cmd_lock
);
1435 spin_lock_init(&dev
->ordered_cmd_lock
);
1436 spin_lock_init(&dev
->state_task_lock
);
1437 spin_lock_init(&dev
->dev_alua_lock
);
1438 spin_lock_init(&dev
->dev_reservation_lock
);
1439 spin_lock_init(&dev
->dev_status_lock
);
1440 spin_lock_init(&dev
->dev_status_thr_lock
);
1441 spin_lock_init(&dev
->se_port_lock
);
1442 spin_lock_init(&dev
->se_tmr_lock
);
1443 spin_lock_init(&dev
->qf_cmd_lock
);
1445 dev
->queue_depth
= dev_limits
->queue_depth
;
1446 atomic_set(&dev
->depth_left
, dev
->queue_depth
);
1447 atomic_set(&dev
->dev_ordered_id
, 0);
1449 se_dev_set_default_attribs(dev
, dev_limits
);
1451 dev
->dev_index
= scsi_get_new_index(SCSI_DEVICE_INDEX
);
1452 dev
->creation_time
= get_jiffies_64();
1453 spin_lock_init(&dev
->stats_lock
);
1455 spin_lock(&hba
->device_lock
);
1456 list_add_tail(&dev
->dev_list
, &hba
->hba_dev_list
);
1458 spin_unlock(&hba
->device_lock
);
1460 * Setup the SAM Task Attribute emulation for struct se_device
1462 core_setup_task_attr_emulation(dev
);
1464 * Force PR and ALUA passthrough emulation with internal object use.
1466 force_pt
= (hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
);
1468 * Setup the Reservations infrastructure for struct se_device
1470 core_setup_reservations(dev
, force_pt
);
1472 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1474 if (core_setup_alua(dev
, force_pt
) < 0)
1478 * Startup the struct se_device processing thread
1480 dev
->process_thread
= kthread_run(transport_processing_thread
, dev
,
1481 "LIO_%s", dev
->transport
->name
);
1482 if (IS_ERR(dev
->process_thread
)) {
1483 pr_err("Unable to create kthread: LIO_%s\n",
1484 dev
->transport
->name
);
1488 * Setup work_queue for QUEUE_FULL
1490 INIT_WORK(&dev
->qf_work_queue
, target_qf_do_work
);
1492 * Preload the initial INQUIRY const values if we are doing
1493 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1494 * passthrough because this is being provided by the backend LLD.
1495 * This is required so that transport_get_inquiry() copies these
1496 * originals once back into DEV_T10_WWN(dev) for the virtual device
1499 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) {
1500 if (!inquiry_prod
|| !inquiry_rev
) {
1501 pr_err("All non TCM/pSCSI plugins require"
1502 " INQUIRY consts\n");
1506 strncpy(&dev
->se_sub_dev
->t10_wwn
.vendor
[0], "LIO-ORG", 8);
1507 strncpy(&dev
->se_sub_dev
->t10_wwn
.model
[0], inquiry_prod
, 16);
1508 strncpy(&dev
->se_sub_dev
->t10_wwn
.revision
[0], inquiry_rev
, 4);
1510 scsi_dump_inquiry(dev
);
1514 kthread_stop(dev
->process_thread
);
1516 spin_lock(&hba
->device_lock
);
1517 list_del(&dev
->dev_list
);
1519 spin_unlock(&hba
->device_lock
);
1521 se_release_vpd_for_dev(dev
);
1527 EXPORT_SYMBOL(transport_add_device_to_core_hba
);
1529 /* transport_generic_prepare_cdb():
1531 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1532 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1533 * The point of this is since we are mapping iSCSI LUNs to
1534 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1535 * devices and HBAs for a loop.
1537 static inline void transport_generic_prepare_cdb(
1541 case READ_10
: /* SBC - RDProtect */
1542 case READ_12
: /* SBC - RDProtect */
1543 case READ_16
: /* SBC - RDProtect */
1544 case SEND_DIAGNOSTIC
: /* SPC - SELF-TEST Code */
1545 case VERIFY
: /* SBC - VRProtect */
1546 case VERIFY_16
: /* SBC - VRProtect */
1547 case WRITE_VERIFY
: /* SBC - VRProtect */
1548 case WRITE_VERIFY_12
: /* SBC - VRProtect */
1551 cdb
[1] &= 0x1f; /* clear logical unit number */
1556 static struct se_task
*
1557 transport_generic_get_task(struct se_cmd
*cmd
,
1558 enum dma_data_direction data_direction
)
1560 struct se_task
*task
;
1561 struct se_device
*dev
= cmd
->se_dev
;
1563 task
= dev
->transport
->alloc_task(cmd
->t_task_cdb
);
1565 pr_err("Unable to allocate struct se_task\n");
1569 INIT_LIST_HEAD(&task
->t_list
);
1570 INIT_LIST_HEAD(&task
->t_execute_list
);
1571 INIT_LIST_HEAD(&task
->t_state_list
);
1572 init_completion(&task
->task_stop_comp
);
1573 task
->task_se_cmd
= cmd
;
1575 task
->task_data_direction
= data_direction
;
1580 static int transport_generic_cmd_sequencer(struct se_cmd
*, unsigned char *);
1583 * Used by fabric modules containing a local struct se_cmd within their
1584 * fabric dependent per I/O descriptor.
1586 void transport_init_se_cmd(
1588 struct target_core_fabric_ops
*tfo
,
1589 struct se_session
*se_sess
,
1593 unsigned char *sense_buffer
)
1595 INIT_LIST_HEAD(&cmd
->se_lun_node
);
1596 INIT_LIST_HEAD(&cmd
->se_delayed_node
);
1597 INIT_LIST_HEAD(&cmd
->se_ordered_node
);
1598 INIT_LIST_HEAD(&cmd
->se_qf_node
);
1599 INIT_LIST_HEAD(&cmd
->se_queue_node
);
1601 INIT_LIST_HEAD(&cmd
->t_task_list
);
1602 init_completion(&cmd
->transport_lun_fe_stop_comp
);
1603 init_completion(&cmd
->transport_lun_stop_comp
);
1604 init_completion(&cmd
->t_transport_stop_comp
);
1605 spin_lock_init(&cmd
->t_state_lock
);
1606 atomic_set(&cmd
->transport_dev_active
, 1);
1609 cmd
->se_sess
= se_sess
;
1610 cmd
->data_length
= data_length
;
1611 cmd
->data_direction
= data_direction
;
1612 cmd
->sam_task_attr
= task_attr
;
1613 cmd
->sense_buffer
= sense_buffer
;
1615 EXPORT_SYMBOL(transport_init_se_cmd
);
1617 static int transport_check_alloc_task_attr(struct se_cmd
*cmd
)
1620 * Check if SAM Task Attribute emulation is enabled for this
1621 * struct se_device storage object
1623 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
1626 if (cmd
->sam_task_attr
== MSG_ACA_TAG
) {
1627 pr_debug("SAM Task Attribute ACA"
1628 " emulation is not supported\n");
1632 * Used to determine when ORDERED commands should go from
1633 * Dormant to Active status.
1635 cmd
->se_ordered_id
= atomic_inc_return(&cmd
->se_dev
->dev_ordered_id
);
1636 smp_mb__after_atomic_inc();
1637 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1638 cmd
->se_ordered_id
, cmd
->sam_task_attr
,
1639 cmd
->se_dev
->transport
->name
);
1643 void transport_free_se_cmd(
1644 struct se_cmd
*se_cmd
)
1646 if (se_cmd
->se_tmr_req
)
1647 core_tmr_release_req(se_cmd
->se_tmr_req
);
1649 * Check and free any extended CDB buffer that was allocated
1651 if (se_cmd
->t_task_cdb
!= se_cmd
->__t_task_cdb
)
1652 kfree(se_cmd
->t_task_cdb
);
1654 EXPORT_SYMBOL(transport_free_se_cmd
);
1656 static void transport_generic_wait_for_tasks(struct se_cmd
*, int, int);
1658 /* transport_generic_allocate_tasks():
1660 * Called from fabric RX Thread.
1662 int transport_generic_allocate_tasks(
1668 transport_generic_prepare_cdb(cdb
);
1671 * This is needed for early exceptions.
1673 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
1676 * Ensure that the received CDB is less than the max (252 + 8) bytes
1677 * for VARIABLE_LENGTH_CMD
1679 if (scsi_command_size(cdb
) > SCSI_MAX_VARLEN_CDB_SIZE
) {
1680 pr_err("Received SCSI CDB with command_size: %d that"
1681 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1682 scsi_command_size(cdb
), SCSI_MAX_VARLEN_CDB_SIZE
);
1686 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1687 * allocate the additional extended CDB buffer now.. Otherwise
1688 * setup the pointer from __t_task_cdb to t_task_cdb.
1690 if (scsi_command_size(cdb
) > sizeof(cmd
->__t_task_cdb
)) {
1691 cmd
->t_task_cdb
= kzalloc(scsi_command_size(cdb
),
1693 if (!cmd
->t_task_cdb
) {
1694 pr_err("Unable to allocate cmd->t_task_cdb"
1695 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1696 scsi_command_size(cdb
),
1697 (unsigned long)sizeof(cmd
->__t_task_cdb
));
1701 cmd
->t_task_cdb
= &cmd
->__t_task_cdb
[0];
1703 * Copy the original CDB into cmd->
1705 memcpy(cmd
->t_task_cdb
, cdb
, scsi_command_size(cdb
));
1707 * Setup the received CDB based on SCSI defined opcodes and
1708 * perform unit attention, persistent reservations and ALUA
1709 * checks for virtual device backends. The cmd->t_task_cdb
1710 * pointer is expected to be setup before we reach this point.
1712 ret
= transport_generic_cmd_sequencer(cmd
, cdb
);
1716 * Check for SAM Task Attribute Emulation
1718 if (transport_check_alloc_task_attr(cmd
) < 0) {
1719 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1720 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1723 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
1724 if (cmd
->se_lun
->lun_sep
)
1725 cmd
->se_lun
->lun_sep
->sep_stats
.cmd_pdus
++;
1726 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
1729 EXPORT_SYMBOL(transport_generic_allocate_tasks
);
1731 static void transport_generic_request_failure(struct se_cmd
*,
1732 struct se_device
*, int, int);
1734 * Used by fabric module frontends to queue tasks directly.
1735 * Many only be used from process context only
1737 int transport_handle_cdb_direct(
1744 pr_err("cmd->se_lun is NULL\n");
1747 if (in_interrupt()) {
1749 pr_err("transport_generic_handle_cdb cannot be called"
1750 " from interrupt context\n");
1754 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1755 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1756 * in existing usage to ensure that outstanding descriptors are handled
1757 * correctly during shutdown via transport_generic_wait_for_tasks()
1759 * Also, we don't take cmd->t_state_lock here as we only expect
1760 * this to be called for initial descriptor submission.
1762 cmd
->t_state
= TRANSPORT_NEW_CMD
;
1763 atomic_set(&cmd
->t_transport_active
, 1);
1765 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1766 * so follow TRANSPORT_NEW_CMD processing thread context usage
1767 * and call transport_generic_request_failure() if necessary..
1769 ret
= transport_generic_new_cmd(cmd
);
1773 cmd
->transport_error_status
= ret
;
1774 transport_generic_request_failure(cmd
, NULL
, 0,
1775 (cmd
->data_direction
!= DMA_TO_DEVICE
));
1779 EXPORT_SYMBOL(transport_handle_cdb_direct
);
1782 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1783 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1784 * complete setup in TCM process context w/ TFO->new_cmd_map().
1786 int transport_generic_handle_cdb_map(
1791 pr_err("cmd->se_lun is NULL\n");
1795 transport_add_cmd_to_queue(cmd
, TRANSPORT_NEW_CMD_MAP
);
1798 EXPORT_SYMBOL(transport_generic_handle_cdb_map
);
1800 /* transport_generic_handle_data():
1804 int transport_generic_handle_data(
1808 * For the software fabric case, then we assume the nexus is being
1809 * failed/shutdown when signals are pending from the kthread context
1810 * caller, so we return a failure. For the HW target mode case running
1811 * in interrupt code, the signal_pending() check is skipped.
1813 if (!in_interrupt() && signal_pending(current
))
1816 * If the received CDB has aleady been ABORTED by the generic
1817 * target engine, we now call transport_check_aborted_status()
1818 * to queue any delated TASK_ABORTED status for the received CDB to the
1819 * fabric module as we are expecting no further incoming DATA OUT
1820 * sequences at this point.
1822 if (transport_check_aborted_status(cmd
, 1) != 0)
1825 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_WRITE
);
1828 EXPORT_SYMBOL(transport_generic_handle_data
);
1830 /* transport_generic_handle_tmr():
1834 int transport_generic_handle_tmr(
1838 * This is needed for early exceptions.
1840 cmd
->transport_wait_for_tasks
= &transport_generic_wait_for_tasks
;
1842 transport_add_cmd_to_queue(cmd
, TRANSPORT_PROCESS_TMR
);
1845 EXPORT_SYMBOL(transport_generic_handle_tmr
);
1847 void transport_generic_free_cmd_intr(
1850 transport_add_cmd_to_queue(cmd
, TRANSPORT_FREE_CMD_INTR
);
1852 EXPORT_SYMBOL(transport_generic_free_cmd_intr
);
1854 static int transport_stop_tasks_for_cmd(struct se_cmd
*cmd
)
1856 struct se_task
*task
, *task_tmp
;
1857 unsigned long flags
;
1860 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1861 cmd
->se_tfo
->get_task_tag(cmd
));
1864 * No tasks remain in the execution queue
1866 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1867 list_for_each_entry_safe(task
, task_tmp
,
1868 &cmd
->t_task_list
, t_list
) {
1869 pr_debug("task_no[%d] - Processing task %p\n",
1870 task
->task_no
, task
);
1872 * If the struct se_task has not been sent and is not active,
1873 * remove the struct se_task from the execution queue.
1875 if (!atomic_read(&task
->task_sent
) &&
1876 !atomic_read(&task
->task_active
)) {
1877 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1879 transport_remove_task_from_execute_queue(task
,
1882 pr_debug("task_no[%d] - Removed from execute queue\n",
1884 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1889 * If the struct se_task is active, sleep until it is returned
1892 if (atomic_read(&task
->task_active
)) {
1893 atomic_set(&task
->task_stop
, 1);
1894 spin_unlock_irqrestore(&cmd
->t_state_lock
,
1897 pr_debug("task_no[%d] - Waiting to complete\n",
1899 wait_for_completion(&task
->task_stop_comp
);
1900 pr_debug("task_no[%d] - Stopped successfully\n",
1903 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
1904 atomic_dec(&cmd
->t_task_cdbs_left
);
1906 atomic_set(&task
->task_active
, 0);
1907 atomic_set(&task
->task_stop
, 0);
1909 pr_debug("task_no[%d] - Did nothing\n", task
->task_no
);
1913 __transport_stop_task_timer(task
, &flags
);
1915 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
1921 * Handle SAM-esque emulation for generic transport request failures.
1923 static void transport_generic_request_failure(
1925 struct se_device
*dev
,
1931 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1932 " CDB: 0x%02x\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
1933 cmd
->t_task_cdb
[0]);
1934 pr_debug("-----[ i_state: %d t_state/def_t_state:"
1935 " %d/%d transport_error_status: %d\n",
1936 cmd
->se_tfo
->get_cmd_state(cmd
),
1937 cmd
->t_state
, cmd
->deferred_t_state
,
1938 cmd
->transport_error_status
);
1939 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1940 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1941 " t_transport_active: %d t_transport_stop: %d"
1942 " t_transport_sent: %d\n", cmd
->t_task_list_num
,
1943 atomic_read(&cmd
->t_task_cdbs_left
),
1944 atomic_read(&cmd
->t_task_cdbs_sent
),
1945 atomic_read(&cmd
->t_task_cdbs_ex_left
),
1946 atomic_read(&cmd
->t_transport_active
),
1947 atomic_read(&cmd
->t_transport_stop
),
1948 atomic_read(&cmd
->t_transport_sent
));
1950 transport_stop_all_task_timers(cmd
);
1953 atomic_inc(&dev
->depth_left
);
1955 * For SAM Task Attribute emulation for failed struct se_cmd
1957 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
1958 transport_complete_task_attr(cmd
);
1961 transport_direct_request_timeout(cmd
);
1962 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
1965 switch (cmd
->transport_error_status
) {
1966 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
:
1967 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
1969 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS
:
1970 cmd
->scsi_sense_reason
= TCM_SECTOR_COUNT_TOO_MANY
;
1972 case PYX_TRANSPORT_INVALID_CDB_FIELD
:
1973 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
1975 case PYX_TRANSPORT_INVALID_PARAMETER_LIST
:
1976 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
1978 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
:
1980 transport_new_cmd_failure(cmd
);
1982 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1983 * we force this session to fall back to session
1986 cmd
->se_tfo
->fall_back_to_erl0(cmd
->se_sess
);
1987 cmd
->se_tfo
->stop_session(cmd
->se_sess
, 0, 0);
1990 case PYX_TRANSPORT_LU_COMM_FAILURE
:
1991 case PYX_TRANSPORT_ILLEGAL_REQUEST
:
1992 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1994 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE
:
1995 cmd
->scsi_sense_reason
= TCM_UNKNOWN_MODE_PAGE
;
1997 case PYX_TRANSPORT_WRITE_PROTECTED
:
1998 cmd
->scsi_sense_reason
= TCM_WRITE_PROTECTED
;
2000 case PYX_TRANSPORT_RESERVATION_CONFLICT
:
2002 * No SENSE Data payload for this case, set SCSI Status
2003 * and queue the response to $FABRIC_MOD.
2005 * Uses linux/include/scsi/scsi.h SAM status codes defs
2007 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2009 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2010 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2013 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2016 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2017 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2018 cmd
->orig_fe_lun
, 0x2C,
2019 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2021 ret
= cmd
->se_tfo
->queue_status(cmd
);
2025 case PYX_TRANSPORT_USE_SENSE_REASON
:
2027 * struct se_cmd->scsi_sense_reason already set
2031 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
2033 cmd
->transport_error_status
);
2034 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
2038 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2039 * make the call to transport_send_check_condition_and_sense()
2040 * directly. Otherwise expect the fabric to make the call to
2041 * transport_send_check_condition_and_sense() after handling
2042 * possible unsoliticied write data payloads.
2044 if (!sc
&& !cmd
->se_tfo
->new_cmd_map
)
2045 transport_new_cmd_failure(cmd
);
2047 ret
= transport_send_check_condition_and_sense(cmd
,
2048 cmd
->scsi_sense_reason
, 0);
2054 transport_lun_remove_cmd(cmd
);
2055 if (!transport_cmd_check_stop_to_fabric(cmd
))
2060 cmd
->t_state
= TRANSPORT_COMPLETE_OK
;
2061 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
2064 static void transport_direct_request_timeout(struct se_cmd
*cmd
)
2066 unsigned long flags
;
2068 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2069 if (!atomic_read(&cmd
->t_transport_timeout
)) {
2070 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2073 if (atomic_read(&cmd
->t_task_cdbs_timeout_left
)) {
2074 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2078 atomic_sub(atomic_read(&cmd
->t_transport_timeout
),
2080 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2083 static void transport_generic_request_timeout(struct se_cmd
*cmd
)
2085 unsigned long flags
;
2088 * Reset cmd->t_se_count to allow transport_generic_remove()
2089 * to allow last call to free memory resources.
2091 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2092 if (atomic_read(&cmd
->t_transport_timeout
) > 1) {
2093 int tmp
= (atomic_read(&cmd
->t_transport_timeout
) - 1);
2095 atomic_sub(tmp
, &cmd
->t_se_count
);
2097 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2099 transport_generic_remove(cmd
, 0);
2102 static inline u32
transport_lba_21(unsigned char *cdb
)
2104 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
2107 static inline u32
transport_lba_32(unsigned char *cdb
)
2109 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2112 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
2114 unsigned int __v1
, __v2
;
2116 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
2117 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
2119 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2123 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2125 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
2127 unsigned int __v1
, __v2
;
2129 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
2130 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
2132 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
2135 static void transport_set_supported_SAM_opcode(struct se_cmd
*se_cmd
)
2137 unsigned long flags
;
2139 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2140 se_cmd
->se_cmd_flags
|= SCF_SUPPORTED_SAM_OPCODE
;
2141 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2145 * Called from interrupt context.
2147 static void transport_task_timeout_handler(unsigned long data
)
2149 struct se_task
*task
= (struct se_task
*)data
;
2150 struct se_cmd
*cmd
= task
->task_se_cmd
;
2151 unsigned long flags
;
2153 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task
, cmd
);
2155 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2156 if (task
->task_flags
& TF_STOP
) {
2157 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2160 task
->task_flags
&= ~TF_RUNNING
;
2163 * Determine if transport_complete_task() has already been called.
2165 if (!atomic_read(&task
->task_active
)) {
2166 pr_debug("transport task: %p cmd: %p timeout task_active"
2167 " == 0\n", task
, cmd
);
2168 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2172 atomic_inc(&cmd
->t_se_count
);
2173 atomic_inc(&cmd
->t_transport_timeout
);
2174 cmd
->t_tasks_failed
= 1;
2176 atomic_set(&task
->task_timeout
, 1);
2177 task
->task_error_status
= PYX_TRANSPORT_TASK_TIMEOUT
;
2178 task
->task_scsi_status
= 1;
2180 if (atomic_read(&task
->task_stop
)) {
2181 pr_debug("transport task: %p cmd: %p timeout task_stop"
2182 " == 1\n", task
, cmd
);
2183 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2184 complete(&task
->task_stop_comp
);
2188 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_left
)) {
2189 pr_debug("transport task: %p cmd: %p timeout non zero"
2190 " t_task_cdbs_left\n", task
, cmd
);
2191 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2194 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2197 cmd
->t_state
= TRANSPORT_COMPLETE_FAILURE
;
2198 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2200 transport_add_cmd_to_queue(cmd
, TRANSPORT_COMPLETE_FAILURE
);
2204 * Called with cmd->t_state_lock held.
2206 static void transport_start_task_timer(struct se_task
*task
)
2208 struct se_device
*dev
= task
->se_dev
;
2211 if (task
->task_flags
& TF_RUNNING
)
2214 * If the task_timeout is disabled, exit now.
2216 timeout
= dev
->se_sub_dev
->se_dev_attrib
.task_timeout
;
2220 init_timer(&task
->task_timer
);
2221 task
->task_timer
.expires
= (get_jiffies_64() + timeout
* HZ
);
2222 task
->task_timer
.data
= (unsigned long) task
;
2223 task
->task_timer
.function
= transport_task_timeout_handler
;
2225 task
->task_flags
|= TF_RUNNING
;
2226 add_timer(&task
->task_timer
);
2228 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2229 " %d\n", task
->task_se_cmd
, task
, timeout
);
2234 * Called with spin_lock_irq(&cmd->t_state_lock) held.
2236 void __transport_stop_task_timer(struct se_task
*task
, unsigned long *flags
)
2238 struct se_cmd
*cmd
= task
->task_se_cmd
;
2240 if (!task
->task_flags
& TF_RUNNING
)
2243 task
->task_flags
|= TF_STOP
;
2244 spin_unlock_irqrestore(&cmd
->t_state_lock
, *flags
);
2246 del_timer_sync(&task
->task_timer
);
2248 spin_lock_irqsave(&cmd
->t_state_lock
, *flags
);
2249 task
->task_flags
&= ~TF_RUNNING
;
2250 task
->task_flags
&= ~TF_STOP
;
2253 static void transport_stop_all_task_timers(struct se_cmd
*cmd
)
2255 struct se_task
*task
= NULL
, *task_tmp
;
2256 unsigned long flags
;
2258 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2259 list_for_each_entry_safe(task
, task_tmp
,
2260 &cmd
->t_task_list
, t_list
)
2261 __transport_stop_task_timer(task
, &flags
);
2262 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2265 static inline int transport_tcq_window_closed(struct se_device
*dev
)
2267 if (dev
->dev_tcq_window_closed
++ <
2268 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD
) {
2269 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT
);
2271 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG
);
2273 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
2278 * Called from Fabric Module context from transport_execute_tasks()
2280 * The return of this function determins if the tasks from struct se_cmd
2281 * get added to the execution queue in transport_execute_tasks(),
2282 * or are added to the delayed or ordered lists here.
2284 static inline int transport_execute_task_attr(struct se_cmd
*cmd
)
2286 if (cmd
->se_dev
->dev_task_attr_type
!= SAM_TASK_ATTR_EMULATED
)
2289 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2290 * to allow the passed struct se_cmd list of tasks to the front of the list.
2292 if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
2293 atomic_inc(&cmd
->se_dev
->dev_hoq_count
);
2294 smp_mb__after_atomic_inc();
2295 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2296 " 0x%02x, se_ordered_id: %u\n",
2298 cmd
->se_ordered_id
);
2300 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
2301 spin_lock(&cmd
->se_dev
->ordered_cmd_lock
);
2302 list_add_tail(&cmd
->se_ordered_node
,
2303 &cmd
->se_dev
->ordered_cmd_list
);
2304 spin_unlock(&cmd
->se_dev
->ordered_cmd_lock
);
2306 atomic_inc(&cmd
->se_dev
->dev_ordered_sync
);
2307 smp_mb__after_atomic_inc();
2309 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2310 " list, se_ordered_id: %u\n",
2312 cmd
->se_ordered_id
);
2314 * Add ORDERED command to tail of execution queue if
2315 * no other older commands exist that need to be
2318 if (!atomic_read(&cmd
->se_dev
->simple_cmds
))
2322 * For SIMPLE and UNTAGGED Task Attribute commands
2324 atomic_inc(&cmd
->se_dev
->simple_cmds
);
2325 smp_mb__after_atomic_inc();
2328 * Otherwise if one or more outstanding ORDERED task attribute exist,
2329 * add the dormant task(s) built for the passed struct se_cmd to the
2330 * execution queue and become in Active state for this struct se_device.
2332 if (atomic_read(&cmd
->se_dev
->dev_ordered_sync
) != 0) {
2334 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2335 * will be drained upon completion of HEAD_OF_QUEUE task.
2337 spin_lock(&cmd
->se_dev
->delayed_cmd_lock
);
2338 cmd
->se_cmd_flags
|= SCF_DELAYED_CMD_FROM_SAM_ATTR
;
2339 list_add_tail(&cmd
->se_delayed_node
,
2340 &cmd
->se_dev
->delayed_cmd_list
);
2341 spin_unlock(&cmd
->se_dev
->delayed_cmd_lock
);
2343 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2344 " delayed CMD list, se_ordered_id: %u\n",
2345 cmd
->t_task_cdb
[0], cmd
->sam_task_attr
,
2346 cmd
->se_ordered_id
);
2348 * Return zero to let transport_execute_tasks() know
2349 * not to add the delayed tasks to the execution list.
2354 * Otherwise, no ORDERED task attributes exist..
2360 * Called from fabric module context in transport_generic_new_cmd() and
2361 * transport_generic_process_write()
2363 static int transport_execute_tasks(struct se_cmd
*cmd
)
2367 if (se_dev_check_online(cmd
->se_orig_obj_ptr
) != 0) {
2368 cmd
->transport_error_status
= PYX_TRANSPORT_LU_COMM_FAILURE
;
2369 transport_generic_request_failure(cmd
, NULL
, 0, 1);
2374 * Call transport_cmd_check_stop() to see if a fabric exception
2375 * has occurred that prevents execution.
2377 if (!transport_cmd_check_stop(cmd
, 0, TRANSPORT_PROCESSING
)) {
2379 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2380 * attribute for the tasks of the received struct se_cmd CDB
2382 add_tasks
= transport_execute_task_attr(cmd
);
2386 * This calls transport_add_tasks_from_cmd() to handle
2387 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2388 * (if enabled) in __transport_add_task_to_execute_queue() and
2389 * transport_add_task_check_sam_attr().
2391 transport_add_tasks_from_cmd(cmd
);
2394 * Kick the execution queue for the cmd associated struct se_device
2398 __transport_execute_tasks(cmd
->se_dev
);
2403 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2404 * from struct se_device->execute_task_list and
2406 * Called from transport_processing_thread()
2408 static int __transport_execute_tasks(struct se_device
*dev
)
2411 struct se_cmd
*cmd
= NULL
;
2412 struct se_task
*task
= NULL
;
2413 unsigned long flags
;
2416 * Check if there is enough room in the device and HBA queue to send
2417 * struct se_tasks to the selected transport.
2420 if (!atomic_read(&dev
->depth_left
))
2421 return transport_tcq_window_closed(dev
);
2423 dev
->dev_tcq_window_closed
= 0;
2425 spin_lock_irq(&dev
->execute_task_lock
);
2426 if (list_empty(&dev
->execute_task_list
)) {
2427 spin_unlock_irq(&dev
->execute_task_lock
);
2430 task
= list_first_entry(&dev
->execute_task_list
,
2431 struct se_task
, t_execute_list
);
2432 list_del(&task
->t_execute_list
);
2433 atomic_set(&task
->task_execute_queue
, 0);
2434 atomic_dec(&dev
->execute_tasks
);
2435 spin_unlock_irq(&dev
->execute_task_lock
);
2437 atomic_dec(&dev
->depth_left
);
2439 cmd
= task
->task_se_cmd
;
2441 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2442 atomic_set(&task
->task_active
, 1);
2443 atomic_set(&task
->task_sent
, 1);
2444 atomic_inc(&cmd
->t_task_cdbs_sent
);
2446 if (atomic_read(&cmd
->t_task_cdbs_sent
) ==
2447 cmd
->t_task_list_num
)
2448 atomic_set(&cmd
->transport_sent
, 1);
2450 transport_start_task_timer(task
);
2451 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2453 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2454 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2455 * struct se_subsystem_api->do_task() caller below.
2457 if (cmd
->transport_emulate_cdb
) {
2458 error
= cmd
->transport_emulate_cdb(cmd
);
2460 cmd
->transport_error_status
= error
;
2461 atomic_set(&task
->task_active
, 0);
2462 atomic_set(&cmd
->transport_sent
, 0);
2463 transport_stop_tasks_for_cmd(cmd
);
2464 transport_generic_request_failure(cmd
, dev
, 0, 1);
2468 * Handle the successful completion for transport_emulate_cdb()
2469 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2470 * Otherwise the caller is expected to complete the task with
2473 if (!(cmd
->se_cmd_flags
& SCF_EMULATE_CDB_ASYNC
)) {
2474 cmd
->scsi_status
= SAM_STAT_GOOD
;
2475 task
->task_scsi_status
= GOOD
;
2476 transport_complete_task(task
, 1);
2480 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2481 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2482 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2483 * LUN emulation code.
2485 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2486 * call ->do_task() directly and let the underlying TCM subsystem plugin
2487 * code handle the CDB emulation.
2489 if ((dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2490 (!(task
->task_se_cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
)))
2491 error
= transport_emulate_control_cdb(task
);
2493 error
= dev
->transport
->do_task(task
);
2496 cmd
->transport_error_status
= error
;
2497 atomic_set(&task
->task_active
, 0);
2498 atomic_set(&cmd
->transport_sent
, 0);
2499 transport_stop_tasks_for_cmd(cmd
);
2500 transport_generic_request_failure(cmd
, dev
, 0, 1);
2509 void transport_new_cmd_failure(struct se_cmd
*se_cmd
)
2511 unsigned long flags
;
2513 * Any unsolicited data will get dumped for failed command inside of
2516 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
2517 se_cmd
->se_cmd_flags
|= SCF_SE_CMD_FAILED
;
2518 se_cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2519 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
2522 static void transport_nop_wait_for_tasks(struct se_cmd
*, int, int);
2524 static inline u32
transport_get_sectors_6(
2529 struct se_device
*dev
= cmd
->se_dev
;
2532 * Assume TYPE_DISK for non struct se_device objects.
2533 * Use 8-bit sector value.
2539 * Use 24-bit allocation length for TYPE_TAPE.
2541 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2542 return (u32
)(cdb
[2] << 16) + (cdb
[3] << 8) + cdb
[4];
2545 * Everything else assume TYPE_DISK Sector CDB location.
2546 * Use 8-bit sector value.
2552 static inline u32
transport_get_sectors_10(
2557 struct se_device
*dev
= cmd
->se_dev
;
2560 * Assume TYPE_DISK for non struct se_device objects.
2561 * Use 16-bit sector value.
2567 * XXX_10 is not defined in SSC, throw an exception
2569 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2575 * Everything else assume TYPE_DISK Sector CDB location.
2576 * Use 16-bit sector value.
2579 return (u32
)(cdb
[7] << 8) + cdb
[8];
2582 static inline u32
transport_get_sectors_12(
2587 struct se_device
*dev
= cmd
->se_dev
;
2590 * Assume TYPE_DISK for non struct se_device objects.
2591 * Use 32-bit sector value.
2597 * XXX_12 is not defined in SSC, throw an exception
2599 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2605 * Everything else assume TYPE_DISK Sector CDB location.
2606 * Use 32-bit sector value.
2609 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
2612 static inline u32
transport_get_sectors_16(
2617 struct se_device
*dev
= cmd
->se_dev
;
2620 * Assume TYPE_DISK for non struct se_device objects.
2621 * Use 32-bit sector value.
2627 * Use 24-bit allocation length for TYPE_TAPE.
2629 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
)
2630 return (u32
)(cdb
[12] << 16) + (cdb
[13] << 8) + cdb
[14];
2633 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
2634 (cdb
[12] << 8) + cdb
[13];
2638 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2640 static inline u32
transport_get_sectors_32(
2646 * Assume TYPE_DISK for non struct se_device objects.
2647 * Use 32-bit sector value.
2649 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
2650 (cdb
[30] << 8) + cdb
[31];
2654 static inline u32
transport_get_size(
2659 struct se_device
*dev
= cmd
->se_dev
;
2661 if (dev
->transport
->get_device_type(dev
) == TYPE_TAPE
) {
2662 if (cdb
[1] & 1) { /* sectors */
2663 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2668 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2669 " %s object\n", dev
->se_sub_dev
->se_dev_attrib
.block_size
, sectors
,
2670 dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
,
2671 dev
->transport
->name
);
2673 return dev
->se_sub_dev
->se_dev_attrib
.block_size
* sectors
;
2676 static void transport_xor_callback(struct se_cmd
*cmd
)
2678 unsigned char *buf
, *addr
;
2679 struct scatterlist
*sg
;
2680 unsigned int offset
;
2684 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2686 * 1) read the specified logical block(s);
2687 * 2) transfer logical blocks from the data-out buffer;
2688 * 3) XOR the logical blocks transferred from the data-out buffer with
2689 * the logical blocks read, storing the resulting XOR data in a buffer;
2690 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2691 * blocks transferred from the data-out buffer; and
2692 * 5) transfer the resulting XOR data to the data-in buffer.
2694 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
2696 pr_err("Unable to allocate xor_callback buf\n");
2700 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2701 * into the locally allocated *buf
2703 sg_copy_to_buffer(cmd
->t_data_sg
,
2709 * Now perform the XOR against the BIDI read memory located at
2710 * cmd->t_mem_bidi_list
2714 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
2715 addr
= kmap_atomic(sg_page(sg
), KM_USER0
);
2719 for (i
= 0; i
< sg
->length
; i
++)
2720 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
2722 offset
+= sg
->length
;
2723 kunmap_atomic(addr
, KM_USER0
);
2731 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2733 static int transport_get_sense_data(struct se_cmd
*cmd
)
2735 unsigned char *buffer
= cmd
->sense_buffer
, *sense_buffer
= NULL
;
2736 struct se_device
*dev
;
2737 struct se_task
*task
= NULL
, *task_tmp
;
2738 unsigned long flags
;
2741 WARN_ON(!cmd
->se_lun
);
2743 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
2744 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
2745 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2749 list_for_each_entry_safe(task
, task_tmp
,
2750 &cmd
->t_task_list
, t_list
) {
2752 if (!task
->task_sense
)
2759 if (!dev
->transport
->get_sense_buffer
) {
2760 pr_err("dev->transport->get_sense_buffer"
2765 sense_buffer
= dev
->transport
->get_sense_buffer(task
);
2766 if (!sense_buffer
) {
2767 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
2768 " sense buffer for task with sense\n",
2769 cmd
->se_tfo
->get_task_tag(cmd
), task
->task_no
);
2772 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2774 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
2775 TRANSPORT_SENSE_BUFFER
);
2777 memcpy(&buffer
[offset
], sense_buffer
,
2778 TRANSPORT_SENSE_BUFFER
);
2779 cmd
->scsi_status
= task
->task_scsi_status
;
2780 /* Automatically padded */
2781 cmd
->scsi_sense_length
=
2782 (TRANSPORT_SENSE_BUFFER
+ offset
);
2784 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2786 dev
->se_hba
->hba_id
, dev
->transport
->name
,
2790 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
2796 transport_handle_reservation_conflict(struct se_cmd
*cmd
)
2798 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
2799 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2800 cmd
->se_cmd_flags
|= SCF_SCSI_RESERVATION_CONFLICT
;
2801 cmd
->scsi_status
= SAM_STAT_RESERVATION_CONFLICT
;
2803 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2804 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2807 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2810 cmd
->se_dev
->se_sub_dev
->se_dev_attrib
.emulate_ua_intlck_ctrl
== 2)
2811 core_scsi3_ua_allocate(cmd
->se_sess
->se_node_acl
,
2812 cmd
->orig_fe_lun
, 0x2C,
2813 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS
);
2817 static inline long long transport_dev_end_lba(struct se_device
*dev
)
2819 return dev
->transport
->get_blocks(dev
) + 1;
2822 static int transport_cmd_get_valid_sectors(struct se_cmd
*cmd
)
2824 struct se_device
*dev
= cmd
->se_dev
;
2827 if (dev
->transport
->get_device_type(dev
) != TYPE_DISK
)
2830 sectors
= (cmd
->data_length
/ dev
->se_sub_dev
->se_dev_attrib
.block_size
);
2832 if ((cmd
->t_task_lba
+ sectors
) > transport_dev_end_lba(dev
)) {
2833 pr_err("LBA: %llu Sectors: %u exceeds"
2834 " transport_dev_end_lba(): %llu\n",
2835 cmd
->t_task_lba
, sectors
,
2836 transport_dev_end_lba(dev
));
2843 static int target_check_write_same_discard(unsigned char *flags
, struct se_device
*dev
)
2846 * Determine if the received WRITE_SAME is used to for direct
2847 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2848 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2849 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2851 int passthrough
= (dev
->transport
->transport_type
==
2852 TRANSPORT_PLUGIN_PHBA_PDEV
);
2855 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
2856 pr_err("WRITE_SAME PBDATA and LBDATA"
2857 " bits not supported for Block Discard"
2862 * Currently for the emulated case we only accept
2863 * tpws with the UNMAP=1 bit set.
2865 if (!(flags
[0] & 0x08)) {
2866 pr_err("WRITE_SAME w/o UNMAP bit not"
2867 " supported for Block Discard Emulation\n");
2875 /* transport_generic_cmd_sequencer():
2877 * Generic Command Sequencer that should work for most DAS transport
2880 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2883 * FIXME: Need to support other SCSI OPCODES where as well.
2885 static int transport_generic_cmd_sequencer(
2889 struct se_device
*dev
= cmd
->se_dev
;
2890 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2891 int ret
= 0, sector_ret
= 0, passthrough
;
2892 u32 sectors
= 0, size
= 0, pr_reg_type
= 0;
2896 * Check for an existing UNIT ATTENTION condition
2898 if (core_scsi3_ua_check(cmd
, cdb
) < 0) {
2899 cmd
->transport_wait_for_tasks
=
2900 &transport_nop_wait_for_tasks
;
2901 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2902 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_UNIT_ATTENTION
;
2906 * Check status of Asymmetric Logical Unit Assignment port
2908 ret
= su_dev
->t10_alua
.alua_state_check(cmd
, cdb
, &alua_ascq
);
2910 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
2912 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2913 * The ALUA additional sense code qualifier (ASCQ) is determined
2914 * by the ALUA primary or secondary access state..
2918 pr_debug("[%s]: ALUA TG Port not available,"
2919 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2920 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
2922 transport_set_sense_codes(cmd
, 0x04, alua_ascq
);
2923 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
2924 cmd
->scsi_sense_reason
= TCM_CHECK_CONDITION_NOT_READY
;
2927 goto out_invalid_cdb_field
;
2930 * Check status for SPC-3 Persistent Reservations
2932 if (su_dev
->t10_pr
.pr_ops
.t10_reservation_check(cmd
, &pr_reg_type
) != 0) {
2933 if (su_dev
->t10_pr
.pr_ops
.t10_seq_non_holder(
2934 cmd
, cdb
, pr_reg_type
) != 0)
2935 return transport_handle_reservation_conflict(cmd
);
2937 * This means the CDB is allowed for the SCSI Initiator port
2938 * when said port is *NOT* holding the legacy SPC-2 or
2939 * SPC-3 Persistent Reservation.
2945 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2947 goto out_unsupported_cdb
;
2948 size
= transport_get_size(sectors
, cdb
, cmd
);
2949 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
2950 cmd
->t_task_lba
= transport_lba_21(cdb
);
2951 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2954 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2956 goto out_unsupported_cdb
;
2957 size
= transport_get_size(sectors
, cdb
, cmd
);
2958 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2959 cmd
->t_task_lba
= transport_lba_32(cdb
);
2960 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2963 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
2965 goto out_unsupported_cdb
;
2966 size
= transport_get_size(sectors
, cdb
, cmd
);
2967 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
2968 cmd
->t_task_lba
= transport_lba_32(cdb
);
2969 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2972 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
2974 goto out_unsupported_cdb
;
2975 size
= transport_get_size(sectors
, cdb
, cmd
);
2976 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
2977 cmd
->t_task_lba
= transport_lba_64(cdb
);
2978 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2981 sectors
= transport_get_sectors_6(cdb
, cmd
, §or_ret
);
2983 goto out_unsupported_cdb
;
2984 size
= transport_get_size(sectors
, cdb
, cmd
);
2985 cmd
->transport_split_cdb
= &split_cdb_XX_6
;
2986 cmd
->t_task_lba
= transport_lba_21(cdb
);
2987 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
2990 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
2992 goto out_unsupported_cdb
;
2993 size
= transport_get_size(sectors
, cdb
, cmd
);
2994 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
2995 cmd
->t_task_lba
= transport_lba_32(cdb
);
2996 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
2997 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3000 sectors
= transport_get_sectors_12(cdb
, cmd
, §or_ret
);
3002 goto out_unsupported_cdb
;
3003 size
= transport_get_size(sectors
, cdb
, cmd
);
3004 cmd
->transport_split_cdb
= &split_cdb_XX_12
;
3005 cmd
->t_task_lba
= transport_lba_32(cdb
);
3006 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
3007 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3010 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3012 goto out_unsupported_cdb
;
3013 size
= transport_get_size(sectors
, cdb
, cmd
);
3014 cmd
->transport_split_cdb
= &split_cdb_XX_16
;
3015 cmd
->t_task_lba
= transport_lba_64(cdb
);
3016 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
3017 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3019 case XDWRITEREAD_10
:
3020 if ((cmd
->data_direction
!= DMA_TO_DEVICE
) ||
3021 !(cmd
->t_tasks_bidi
))
3022 goto out_invalid_cdb_field
;
3023 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3025 goto out_unsupported_cdb
;
3026 size
= transport_get_size(sectors
, cdb
, cmd
);
3027 cmd
->transport_split_cdb
= &split_cdb_XX_10
;
3028 cmd
->t_task_lba
= transport_lba_32(cdb
);
3029 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3030 passthrough
= (dev
->transport
->transport_type
==
3031 TRANSPORT_PLUGIN_PHBA_PDEV
);
3033 * Skip the remaining assignments for TCM/PSCSI passthrough
3038 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3040 cmd
->transport_complete_callback
= &transport_xor_callback
;
3041 cmd
->t_tasks_fua
= (cdb
[1] & 0x8);
3043 case VARIABLE_LENGTH_CMD
:
3044 service_action
= get_unaligned_be16(&cdb
[8]);
3046 * Determine if this is TCM/PSCSI device and we should disable
3047 * internal emulation for this CDB.
3049 passthrough
= (dev
->transport
->transport_type
==
3050 TRANSPORT_PLUGIN_PHBA_PDEV
);
3052 switch (service_action
) {
3053 case XDWRITEREAD_32
:
3054 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3056 goto out_unsupported_cdb
;
3057 size
= transport_get_size(sectors
, cdb
, cmd
);
3059 * Use WRITE_32 and READ_32 opcodes for the emulated
3060 * XDWRITE_READ_32 logic.
3062 cmd
->transport_split_cdb
= &split_cdb_XX_32
;
3063 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
3064 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_SG_IO_CDB
;
3067 * Skip the remaining assignments for TCM/PSCSI passthrough
3073 * Setup BIDI XOR callback to be run during
3074 * transport_generic_complete_ok()
3076 cmd
->transport_complete_callback
= &transport_xor_callback
;
3077 cmd
->t_tasks_fua
= (cdb
[10] & 0x8);
3080 sectors
= transport_get_sectors_32(cdb
, cmd
, §or_ret
);
3082 goto out_unsupported_cdb
;
3085 size
= transport_get_size(1, cdb
, cmd
);
3087 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3089 goto out_invalid_cdb_field
;
3092 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
3093 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3095 if (target_check_write_same_discard(&cdb
[10], dev
) < 0)
3096 goto out_invalid_cdb_field
;
3100 pr_err("VARIABLE_LENGTH_CMD service action"
3101 " 0x%04x not supported\n", service_action
);
3102 goto out_unsupported_cdb
;
3105 case MAINTENANCE_IN
:
3106 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3107 /* MAINTENANCE_IN from SCC-2 */
3109 * Check for emulated MI_REPORT_TARGET_PGS.
3111 if (cdb
[1] == MI_REPORT_TARGET_PGS
) {
3112 cmd
->transport_emulate_cdb
=
3113 (su_dev
->t10_alua
.alua_type
==
3114 SPC3_ALUA_EMULATED
) ?
3115 core_emulate_report_target_port_groups
:
3118 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3119 (cdb
[8] << 8) | cdb
[9];
3121 /* GPCMD_SEND_KEY from multi media commands */
3122 size
= (cdb
[8] << 8) + cdb
[9];
3124 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3128 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3130 case MODE_SELECT_10
:
3131 size
= (cdb
[7] << 8) + cdb
[8];
3132 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3136 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3139 case GPCMD_READ_BUFFER_CAPACITY
:
3140 case GPCMD_SEND_OPC
:
3143 size
= (cdb
[7] << 8) + cdb
[8];
3144 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3146 case READ_BLOCK_LIMITS
:
3147 size
= READ_BLOCK_LEN
;
3148 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3150 case GPCMD_GET_CONFIGURATION
:
3151 case GPCMD_READ_FORMAT_CAPACITIES
:
3152 case GPCMD_READ_DISC_INFO
:
3153 case GPCMD_READ_TRACK_RZONE_INFO
:
3154 size
= (cdb
[7] << 8) + cdb
[8];
3155 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3157 case PERSISTENT_RESERVE_IN
:
3158 case PERSISTENT_RESERVE_OUT
:
3159 cmd
->transport_emulate_cdb
=
3160 (su_dev
->t10_pr
.res_type
==
3161 SPC3_PERSISTENT_RESERVATIONS
) ?
3162 core_scsi3_emulate_pr
: NULL
;
3163 size
= (cdb
[7] << 8) + cdb
[8];
3164 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3166 case GPCMD_MECHANISM_STATUS
:
3167 case GPCMD_READ_DVD_STRUCTURE
:
3168 size
= (cdb
[8] << 8) + cdb
[9];
3169 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3172 size
= READ_POSITION_LEN
;
3173 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3175 case MAINTENANCE_OUT
:
3176 if (dev
->transport
->get_device_type(dev
) != TYPE_ROM
) {
3177 /* MAINTENANCE_OUT from SCC-2
3179 * Check for emulated MO_SET_TARGET_PGS.
3181 if (cdb
[1] == MO_SET_TARGET_PGS
) {
3182 cmd
->transport_emulate_cdb
=
3183 (su_dev
->t10_alua
.alua_type
==
3184 SPC3_ALUA_EMULATED
) ?
3185 core_emulate_set_target_port_groups
:
3189 size
= (cdb
[6] << 24) | (cdb
[7] << 16) |
3190 (cdb
[8] << 8) | cdb
[9];
3192 /* GPCMD_REPORT_KEY from multi media commands */
3193 size
= (cdb
[8] << 8) + cdb
[9];
3195 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3198 size
= (cdb
[3] << 8) + cdb
[4];
3200 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3201 * See spc4r17 section 5.3
3203 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3204 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3205 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3208 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3209 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3212 size
= READ_CAP_LEN
;
3213 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3215 case READ_MEDIA_SERIAL_NUMBER
:
3216 case SECURITY_PROTOCOL_IN
:
3217 case SECURITY_PROTOCOL_OUT
:
3218 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3219 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3221 case SERVICE_ACTION_IN
:
3222 case ACCESS_CONTROL_IN
:
3223 case ACCESS_CONTROL_OUT
:
3225 case READ_ATTRIBUTE
:
3226 case RECEIVE_COPY_RESULTS
:
3227 case WRITE_ATTRIBUTE
:
3228 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
3229 (cdb
[12] << 8) | cdb
[13];
3230 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3232 case RECEIVE_DIAGNOSTIC
:
3233 case SEND_DIAGNOSTIC
:
3234 size
= (cdb
[3] << 8) | cdb
[4];
3235 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3237 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3240 sectors
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3241 size
= (2336 * sectors
);
3242 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3247 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3251 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3253 case READ_ELEMENT_STATUS
:
3254 size
= 65536 * cdb
[7] + 256 * cdb
[8] + cdb
[9];
3255 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3258 size
= (cdb
[6] << 16) + (cdb
[7] << 8) + cdb
[8];
3259 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3264 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3265 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3267 if (cdb
[0] == RESERVE_10
)
3268 size
= (cdb
[7] << 8) | cdb
[8];
3270 size
= cmd
->data_length
;
3273 * Setup the legacy emulated handler for SPC-2 and
3274 * >= SPC-3 compatible reservation handling (CRH=1)
3275 * Otherwise, we assume the underlying SCSI logic is
3276 * is running in SPC_PASSTHROUGH, and wants reservations
3277 * emulation disabled.
3279 cmd
->transport_emulate_cdb
=
3280 (su_dev
->t10_pr
.res_type
!=
3282 core_scsi2_emulate_crh
: NULL
;
3283 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3288 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3289 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3291 if (cdb
[0] == RELEASE_10
)
3292 size
= (cdb
[7] << 8) | cdb
[8];
3294 size
= cmd
->data_length
;
3296 cmd
->transport_emulate_cdb
=
3297 (su_dev
->t10_pr
.res_type
!=
3299 core_scsi2_emulate_crh
: NULL
;
3300 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3302 case SYNCHRONIZE_CACHE
:
3303 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3305 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3307 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
3308 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3309 cmd
->t_task_lba
= transport_lba_32(cdb
);
3311 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3312 cmd
->t_task_lba
= transport_lba_64(cdb
);
3315 goto out_unsupported_cdb
;
3317 size
= transport_get_size(sectors
, cdb
, cmd
);
3318 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3321 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3323 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
3326 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3327 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3329 cmd
->se_cmd_flags
|= SCF_EMULATE_CDB_ASYNC
;
3331 * Check to ensure that LBA + Range does not exceed past end of
3332 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3334 if ((cmd
->t_task_lba
!= 0) || (sectors
!= 0)) {
3335 if (transport_cmd_get_valid_sectors(cmd
) < 0)
3336 goto out_invalid_cdb_field
;
3340 size
= get_unaligned_be16(&cdb
[7]);
3341 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3344 sectors
= transport_get_sectors_16(cdb
, cmd
, §or_ret
);
3346 goto out_unsupported_cdb
;
3349 size
= transport_get_size(1, cdb
, cmd
);
3351 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3352 goto out_invalid_cdb_field
;
3355 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
3356 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3358 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3359 goto out_invalid_cdb_field
;
3362 sectors
= transport_get_sectors_10(cdb
, cmd
, §or_ret
);
3364 goto out_unsupported_cdb
;
3367 size
= transport_get_size(1, cdb
, cmd
);
3369 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3370 goto out_invalid_cdb_field
;
3373 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
3374 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3376 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3377 * of byte 1 bit 3 UNMAP instead of original reserved field
3379 if (target_check_write_same_discard(&cdb
[1], dev
) < 0)
3380 goto out_invalid_cdb_field
;
3382 case ALLOW_MEDIUM_REMOVAL
:
3383 case GPCMD_CLOSE_TRACK
:
3385 case INITIALIZE_ELEMENT_STATUS
:
3386 case GPCMD_LOAD_UNLOAD
:
3389 case GPCMD_SET_SPEED
:
3392 case TEST_UNIT_READY
:
3394 case WRITE_FILEMARKS
:
3396 cmd
->se_cmd_flags
|= SCF_SCSI_NON_DATA_CDB
;
3399 cmd
->transport_emulate_cdb
=
3400 transport_core_report_lun_response
;
3401 size
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
3403 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3404 * See spc4r17 section 5.3
3406 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3407 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
3408 cmd
->se_cmd_flags
|= SCF_SCSI_CONTROL_SG_IO_CDB
;
3411 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3412 " 0x%02x, sending CHECK_CONDITION.\n",
3413 cmd
->se_tfo
->get_fabric_name(), cdb
[0]);
3414 cmd
->transport_wait_for_tasks
= &transport_nop_wait_for_tasks
;
3415 goto out_unsupported_cdb
;
3418 if (size
!= cmd
->data_length
) {
3419 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3420 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3421 " 0x%02x\n", cmd
->se_tfo
->get_fabric_name(),
3422 cmd
->data_length
, size
, cdb
[0]);
3424 cmd
->cmd_spdtl
= size
;
3426 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
3427 pr_err("Rejecting underflow/overflow"
3429 goto out_invalid_cdb_field
;
3432 * Reject READ_* or WRITE_* with overflow/underflow for
3433 * type SCF_SCSI_DATA_SG_IO_CDB.
3435 if (!ret
&& (dev
->se_sub_dev
->se_dev_attrib
.block_size
!= 512)) {
3436 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3437 " CDB on non 512-byte sector setup subsystem"
3438 " plugin: %s\n", dev
->transport
->name
);
3439 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3440 goto out_invalid_cdb_field
;
3443 if (size
> cmd
->data_length
) {
3444 cmd
->se_cmd_flags
|= SCF_OVERFLOW_BIT
;
3445 cmd
->residual_count
= (size
- cmd
->data_length
);
3447 cmd
->se_cmd_flags
|= SCF_UNDERFLOW_BIT
;
3448 cmd
->residual_count
= (cmd
->data_length
- size
);
3450 cmd
->data_length
= size
;
3453 /* Let's limit control cdbs to a page, for simplicity's sake. */
3454 if ((cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) &&
3456 goto out_invalid_cdb_field
;
3458 transport_set_supported_SAM_opcode(cmd
);
3461 out_unsupported_cdb
:
3462 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3463 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
3465 out_invalid_cdb_field
:
3466 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3467 cmd
->scsi_sense_reason
= TCM_INVALID_CDB_FIELD
;
3472 * Called from transport_generic_complete_ok() and
3473 * transport_generic_request_failure() to determine which dormant/delayed
3474 * and ordered cmds need to have their tasks added to the execution queue.
3476 static void transport_complete_task_attr(struct se_cmd
*cmd
)
3478 struct se_device
*dev
= cmd
->se_dev
;
3479 struct se_cmd
*cmd_p
, *cmd_tmp
;
3480 int new_active_tasks
= 0;
3482 if (cmd
->sam_task_attr
== MSG_SIMPLE_TAG
) {
3483 atomic_dec(&dev
->simple_cmds
);
3484 smp_mb__after_atomic_dec();
3485 dev
->dev_cur_ordered_id
++;
3486 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3487 " SIMPLE: %u\n", dev
->dev_cur_ordered_id
,
3488 cmd
->se_ordered_id
);
3489 } else if (cmd
->sam_task_attr
== MSG_HEAD_TAG
) {
3490 atomic_dec(&dev
->dev_hoq_count
);
3491 smp_mb__after_atomic_dec();
3492 dev
->dev_cur_ordered_id
++;
3493 pr_debug("Incremented dev_cur_ordered_id: %u for"
3494 " HEAD_OF_QUEUE: %u\n", dev
->dev_cur_ordered_id
,
3495 cmd
->se_ordered_id
);
3496 } else if (cmd
->sam_task_attr
== MSG_ORDERED_TAG
) {
3497 spin_lock(&dev
->ordered_cmd_lock
);
3498 list_del(&cmd
->se_ordered_node
);
3499 atomic_dec(&dev
->dev_ordered_sync
);
3500 smp_mb__after_atomic_dec();
3501 spin_unlock(&dev
->ordered_cmd_lock
);
3503 dev
->dev_cur_ordered_id
++;
3504 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3505 " %u\n", dev
->dev_cur_ordered_id
, cmd
->se_ordered_id
);
3508 * Process all commands up to the last received
3509 * ORDERED task attribute which requires another blocking
3512 spin_lock(&dev
->delayed_cmd_lock
);
3513 list_for_each_entry_safe(cmd_p
, cmd_tmp
,
3514 &dev
->delayed_cmd_list
, se_delayed_node
) {
3516 list_del(&cmd_p
->se_delayed_node
);
3517 spin_unlock(&dev
->delayed_cmd_lock
);
3519 pr_debug("Calling add_tasks() for"
3520 " cmd_p: 0x%02x Task Attr: 0x%02x"
3521 " Dormant -> Active, se_ordered_id: %u\n",
3522 cmd_p
->t_task_cdb
[0],
3523 cmd_p
->sam_task_attr
, cmd_p
->se_ordered_id
);
3525 transport_add_tasks_from_cmd(cmd_p
);
3528 spin_lock(&dev
->delayed_cmd_lock
);
3529 if (cmd_p
->sam_task_attr
== MSG_ORDERED_TAG
)
3532 spin_unlock(&dev
->delayed_cmd_lock
);
3534 * If new tasks have become active, wake up the transport thread
3535 * to do the processing of the Active tasks.
3537 if (new_active_tasks
!= 0)
3538 wake_up_interruptible(&dev
->dev_queue_obj
.thread_wq
);
3541 static int transport_complete_qf(struct se_cmd
*cmd
)
3545 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
)
3546 return cmd
->se_tfo
->queue_status(cmd
);
3548 switch (cmd
->data_direction
) {
3549 case DMA_FROM_DEVICE
:
3550 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3553 if (cmd
->t_bidi_data_sg
) {
3554 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3558 /* Fall through for DMA_TO_DEVICE */
3560 ret
= cmd
->se_tfo
->queue_status(cmd
);
3569 static void transport_handle_queue_full(
3571 struct se_device
*dev
,
3572 int (*qf_callback
)(struct se_cmd
*))
3574 spin_lock_irq(&dev
->qf_cmd_lock
);
3575 cmd
->se_cmd_flags
|= SCF_EMULATE_QUEUE_FULL
;
3576 cmd
->transport_qf_callback
= qf_callback
;
3577 list_add_tail(&cmd
->se_qf_node
, &cmd
->se_dev
->qf_cmd_list
);
3578 atomic_inc(&dev
->dev_qf_count
);
3579 smp_mb__after_atomic_inc();
3580 spin_unlock_irq(&cmd
->se_dev
->qf_cmd_lock
);
3582 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3585 static void transport_generic_complete_ok(struct se_cmd
*cmd
)
3587 int reason
= 0, ret
;
3589 * Check if we need to move delayed/dormant tasks from cmds on the
3590 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3593 if (cmd
->se_dev
->dev_task_attr_type
== SAM_TASK_ATTR_EMULATED
)
3594 transport_complete_task_attr(cmd
);
3596 * Check to schedule QUEUE_FULL work, or execute an existing
3597 * cmd->transport_qf_callback()
3599 if (atomic_read(&cmd
->se_dev
->dev_qf_count
) != 0)
3600 schedule_work(&cmd
->se_dev
->qf_work_queue
);
3602 if (cmd
->transport_qf_callback
) {
3603 ret
= cmd
->transport_qf_callback(cmd
);
3607 cmd
->transport_qf_callback
= NULL
;
3611 * Check if we need to retrieve a sense buffer from
3612 * the struct se_cmd in question.
3614 if (cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) {
3615 if (transport_get_sense_data(cmd
) < 0)
3616 reason
= TCM_NON_EXISTENT_LUN
;
3619 * Only set when an struct se_task->task_scsi_status returned
3620 * a non GOOD status.
3622 if (cmd
->scsi_status
) {
3623 ret
= transport_send_check_condition_and_sense(
3628 transport_lun_remove_cmd(cmd
);
3629 transport_cmd_check_stop_to_fabric(cmd
);
3634 * Check for a callback, used by amongst other things
3635 * XDWRITE_READ_10 emulation.
3637 if (cmd
->transport_complete_callback
)
3638 cmd
->transport_complete_callback(cmd
);
3640 switch (cmd
->data_direction
) {
3641 case DMA_FROM_DEVICE
:
3642 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3643 if (cmd
->se_lun
->lun_sep
) {
3644 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3647 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3649 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3654 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3655 if (cmd
->se_lun
->lun_sep
) {
3656 cmd
->se_lun
->lun_sep
->sep_stats
.rx_data_octets
+=
3659 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3661 * Check if we need to send READ payload for BIDI-COMMAND
3663 if (cmd
->t_bidi_data_sg
) {
3664 spin_lock(&cmd
->se_lun
->lun_sep_lock
);
3665 if (cmd
->se_lun
->lun_sep
) {
3666 cmd
->se_lun
->lun_sep
->sep_stats
.tx_data_octets
+=
3669 spin_unlock(&cmd
->se_lun
->lun_sep_lock
);
3670 ret
= cmd
->se_tfo
->queue_data_in(cmd
);
3675 /* Fall through for DMA_TO_DEVICE */
3677 ret
= cmd
->se_tfo
->queue_status(cmd
);
3686 transport_lun_remove_cmd(cmd
);
3687 transport_cmd_check_stop_to_fabric(cmd
);
3691 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3692 " data_direction: %d\n", cmd
, cmd
->data_direction
);
3693 transport_handle_queue_full(cmd
, cmd
->se_dev
, transport_complete_qf
);
3696 static void transport_free_dev_tasks(struct se_cmd
*cmd
)
3698 struct se_task
*task
, *task_tmp
;
3699 unsigned long flags
;
3701 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3702 list_for_each_entry_safe(task
, task_tmp
,
3703 &cmd
->t_task_list
, t_list
) {
3704 if (atomic_read(&task
->task_active
))
3707 kfree(task
->task_sg_bidi
);
3708 kfree(task
->task_sg
);
3710 list_del(&task
->t_list
);
3712 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3714 task
->se_dev
->transport
->free_task(task
);
3716 pr_err("task[%u] - task->se_dev is NULL\n",
3718 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3720 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3723 static inline void transport_free_sgl(struct scatterlist
*sgl
, int nents
)
3725 struct scatterlist
*sg
;
3728 for_each_sg(sgl
, sg
, nents
, count
)
3729 __free_page(sg_page(sg
));
3734 static inline void transport_free_pages(struct se_cmd
*cmd
)
3736 if (cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
)
3739 transport_free_sgl(cmd
->t_data_sg
, cmd
->t_data_nents
);
3740 cmd
->t_data_sg
= NULL
;
3741 cmd
->t_data_nents
= 0;
3743 transport_free_sgl(cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
);
3744 cmd
->t_bidi_data_sg
= NULL
;
3745 cmd
->t_bidi_data_nents
= 0;
3748 static inline void transport_release_tasks(struct se_cmd
*cmd
)
3750 transport_free_dev_tasks(cmd
);
3753 static inline int transport_dec_and_check(struct se_cmd
*cmd
)
3755 unsigned long flags
;
3757 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3758 if (atomic_read(&cmd
->t_fe_count
)) {
3759 if (!atomic_dec_and_test(&cmd
->t_fe_count
)) {
3760 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3766 if (atomic_read(&cmd
->t_se_count
)) {
3767 if (!atomic_dec_and_test(&cmd
->t_se_count
)) {
3768 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3773 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3778 static void transport_release_fe_cmd(struct se_cmd
*cmd
)
3780 unsigned long flags
;
3782 if (transport_dec_and_check(cmd
))
3785 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3786 if (!atomic_read(&cmd
->transport_dev_active
)) {
3787 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3790 atomic_set(&cmd
->transport_dev_active
, 0);
3791 transport_all_task_dev_remove_state(cmd
);
3792 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3794 transport_release_tasks(cmd
);
3796 transport_free_pages(cmd
);
3797 transport_release_cmd(cmd
);
3801 transport_generic_remove(struct se_cmd
*cmd
, int session_reinstatement
)
3803 unsigned long flags
;
3805 if (transport_dec_and_check(cmd
)) {
3806 if (session_reinstatement
) {
3807 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3808 transport_all_task_dev_remove_state(cmd
);
3809 spin_unlock_irqrestore(&cmd
->t_state_lock
,
3815 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
3816 if (!atomic_read(&cmd
->transport_dev_active
)) {
3817 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3820 atomic_set(&cmd
->transport_dev_active
, 0);
3821 transport_all_task_dev_remove_state(cmd
);
3822 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
3824 transport_release_tasks(cmd
);
3827 transport_free_pages(cmd
);
3828 transport_release_cmd(cmd
);
3833 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3834 * allocating in the core.
3835 * @cmd: Associated se_cmd descriptor
3836 * @mem: SGL style memory for TCM WRITE / READ
3837 * @sg_mem_num: Number of SGL elements
3838 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3839 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3841 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3844 int transport_generic_map_mem_to_cmd(
3846 struct scatterlist
*sgl
,
3848 struct scatterlist
*sgl_bidi
,
3851 if (!sgl
|| !sgl_count
)
3854 if ((cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) ||
3855 (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
)) {
3857 cmd
->t_data_sg
= sgl
;
3858 cmd
->t_data_nents
= sgl_count
;
3860 if (sgl_bidi
&& sgl_bidi_count
) {
3861 cmd
->t_bidi_data_sg
= sgl_bidi
;
3862 cmd
->t_bidi_data_nents
= sgl_bidi_count
;
3864 cmd
->se_cmd_flags
|= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
;
3869 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd
);
3871 static int transport_new_cmd_obj(struct se_cmd
*cmd
)
3873 struct se_device
*dev
= cmd
->se_dev
;
3874 int set_counts
= 1, rc
, task_cdbs
;
3877 * Setup any BIDI READ tasks and memory from
3878 * cmd->t_mem_bidi_list so the READ struct se_tasks
3879 * are queued first for the non pSCSI passthrough case.
3881 if (cmd
->t_bidi_data_sg
&&
3882 (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
)) {
3883 rc
= transport_allocate_tasks(cmd
,
3886 cmd
->t_bidi_data_sg
,
3887 cmd
->t_bidi_data_nents
);
3889 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3890 cmd
->scsi_sense_reason
=
3891 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3894 atomic_inc(&cmd
->t_fe_count
);
3895 atomic_inc(&cmd
->t_se_count
);
3899 * Setup the tasks and memory from cmd->t_mem_list
3900 * Note for BIDI transfers this will contain the WRITE payload
3902 task_cdbs
= transport_allocate_tasks(cmd
,
3904 cmd
->data_direction
,
3907 if (task_cdbs
<= 0) {
3908 cmd
->se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
3909 cmd
->scsi_sense_reason
=
3910 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3915 atomic_inc(&cmd
->t_fe_count
);
3916 atomic_inc(&cmd
->t_se_count
);
3919 cmd
->t_task_list_num
= task_cdbs
;
3921 atomic_set(&cmd
->t_task_cdbs_left
, task_cdbs
);
3922 atomic_set(&cmd
->t_task_cdbs_ex_left
, task_cdbs
);
3923 atomic_set(&cmd
->t_task_cdbs_timeout_left
, task_cdbs
);
3927 void *transport_kmap_first_data_page(struct se_cmd
*cmd
)
3929 struct scatterlist
*sg
= cmd
->t_data_sg
;
3933 * We need to take into account a possible offset here for fabrics like
3934 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3935 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3937 return kmap(sg_page(sg
)) + sg
->offset
;
3939 EXPORT_SYMBOL(transport_kmap_first_data_page
);
3941 void transport_kunmap_first_data_page(struct se_cmd
*cmd
)
3943 kunmap(sg_page(cmd
->t_data_sg
));
3945 EXPORT_SYMBOL(transport_kunmap_first_data_page
);
3948 transport_generic_get_mem(struct se_cmd
*cmd
)
3950 u32 length
= cmd
->data_length
;
3955 nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
3956 cmd
->t_data_sg
= kmalloc(sizeof(struct scatterlist
) * nents
, GFP_KERNEL
);
3957 if (!cmd
->t_data_sg
)
3960 cmd
->t_data_nents
= nents
;
3961 sg_init_table(cmd
->t_data_sg
, nents
);
3964 u32 page_len
= min_t(u32
, length
, PAGE_SIZE
);
3965 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3969 sg_set_page(&cmd
->t_data_sg
[i
], page
, page_len
, 0);
3977 __free_page(sg_page(&cmd
->t_data_sg
[i
]));
3980 kfree(cmd
->t_data_sg
);
3981 cmd
->t_data_sg
= NULL
;
3985 /* Reduce sectors if they are too long for the device */
3986 static inline sector_t
transport_limit_task_sectors(
3987 struct se_device
*dev
,
3988 unsigned long long lba
,
3991 sectors
= min_t(sector_t
, sectors
, dev
->se_sub_dev
->se_dev_attrib
.max_sectors
);
3993 if (dev
->transport
->get_device_type(dev
) == TYPE_DISK
)
3994 if ((lba
+ sectors
) > transport_dev_end_lba(dev
))
3995 sectors
= ((transport_dev_end_lba(dev
) - lba
) + 1);
4002 * This function can be used by HW target mode drivers to create a linked
4003 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4004 * This is intended to be called during the completion path by TCM Core
4005 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4007 void transport_do_task_sg_chain(struct se_cmd
*cmd
)
4009 struct scatterlist
*sg_first
= NULL
;
4010 struct scatterlist
*sg_prev
= NULL
;
4011 int sg_prev_nents
= 0;
4012 struct scatterlist
*sg
;
4013 struct se_task
*task
;
4014 u32 chained_nents
= 0;
4017 BUG_ON(!cmd
->se_tfo
->task_sg_chaining
);
4020 * Walk the struct se_task list and setup scatterlist chains
4021 * for each contiguously allocated struct se_task->task_sg[].
4023 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
4028 sg_first
= task
->task_sg
;
4029 chained_nents
= task
->task_sg_nents
;
4031 sg_chain(sg_prev
, sg_prev_nents
, task
->task_sg
);
4032 chained_nents
+= task
->task_sg_nents
;
4035 * For the padded tasks, use the extra SGL vector allocated
4036 * in transport_allocate_data_tasks() for the sg_prev_nents
4037 * offset into sg_chain() above.. The last task of a
4038 * multi-task list, or a single task will not have
4039 * task->task_sg_padded set..
4041 if (task
->task_padded_sg
)
4042 sg_prev_nents
= (task
->task_sg_nents
+ 1);
4044 sg_prev_nents
= task
->task_sg_nents
;
4046 sg_prev
= task
->task_sg
;
4049 * Setup the starting pointer and total t_tasks_sg_linked_no including
4050 * padding SGs for linking and to mark the end.
4052 cmd
->t_tasks_sg_chained
= sg_first
;
4053 cmd
->t_tasks_sg_chained_no
= chained_nents
;
4055 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
4056 " t_tasks_sg_chained_no: %u\n", cmd
, cmd
->t_tasks_sg_chained
,
4057 cmd
->t_tasks_sg_chained_no
);
4059 for_each_sg(cmd
->t_tasks_sg_chained
, sg
,
4060 cmd
->t_tasks_sg_chained_no
, i
) {
4062 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
4063 i
, sg
, sg_page(sg
), sg
->length
, sg
->offset
);
4064 if (sg_is_chain(sg
))
4065 pr_debug("SG: %p sg_is_chain=1\n", sg
);
4067 pr_debug("SG: %p sg_is_last=1\n", sg
);
4070 EXPORT_SYMBOL(transport_do_task_sg_chain
);
4073 * Break up cmd into chunks transport can handle
4075 static int transport_allocate_data_tasks(
4077 unsigned long long lba
,
4078 enum dma_data_direction data_direction
,
4079 struct scatterlist
*sgl
,
4080 unsigned int sgl_nents
)
4082 unsigned char *cdb
= NULL
;
4083 struct se_task
*task
;
4084 struct se_device
*dev
= cmd
->se_dev
;
4085 unsigned long flags
;
4086 int task_count
, i
, ret
;
4087 sector_t sectors
, dev_max_sectors
= dev
->se_sub_dev
->se_dev_attrib
.max_sectors
;
4088 u32 sector_size
= dev
->se_sub_dev
->se_dev_attrib
.block_size
;
4089 struct scatterlist
*sg
;
4090 struct scatterlist
*cmd_sg
;
4092 WARN_ON(cmd
->data_length
% sector_size
);
4093 sectors
= DIV_ROUND_UP(cmd
->data_length
, sector_size
);
4094 task_count
= DIV_ROUND_UP_SECTOR_T(sectors
, dev_max_sectors
);
4097 for (i
= 0; i
< task_count
; i
++) {
4098 unsigned int task_size
, task_sg_nents_padded
;
4101 task
= transport_generic_get_task(cmd
, data_direction
);
4105 task
->task_lba
= lba
;
4106 task
->task_sectors
= min(sectors
, dev_max_sectors
);
4107 task
->task_size
= task
->task_sectors
* sector_size
;
4109 cdb
= dev
->transport
->get_cdb(task
);
4112 memcpy(cdb
, cmd
->t_task_cdb
,
4113 scsi_command_size(cmd
->t_task_cdb
));
4115 /* Update new cdb with updated lba/sectors */
4116 cmd
->transport_split_cdb(task
->task_lba
, task
->task_sectors
, cdb
);
4118 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
4119 * in order to calculate the number per task SGL entries
4121 task
->task_sg_nents
= DIV_ROUND_UP(task
->task_size
, PAGE_SIZE
);
4123 * Check if the fabric module driver is requesting that all
4124 * struct se_task->task_sg[] be chained together.. If so,
4125 * then allocate an extra padding SG entry for linking and
4126 * marking the end of the chained SGL for every task except
4127 * the last one for (task_count > 1) operation, or skipping
4128 * the extra padding for the (task_count == 1) case.
4130 if (cmd
->se_tfo
->task_sg_chaining
&& (i
< (task_count
- 1))) {
4131 task_sg_nents_padded
= (task
->task_sg_nents
+ 1);
4132 task
->task_padded_sg
= 1;
4134 task_sg_nents_padded
= task
->task_sg_nents
;
4136 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) *
4137 task_sg_nents_padded
, GFP_KERNEL
);
4138 if (!task
->task_sg
) {
4139 cmd
->se_dev
->transport
->free_task(task
);
4143 sg_init_table(task
->task_sg
, task_sg_nents_padded
);
4145 task_size
= task
->task_size
;
4147 /* Build new sgl, only up to task_size */
4148 for_each_sg(task
->task_sg
, sg
, task
->task_sg_nents
, count
) {
4149 if (cmd_sg
->length
> task_size
)
4153 task_size
-= cmd_sg
->length
;
4154 cmd_sg
= sg_next(cmd_sg
);
4157 lba
+= task
->task_sectors
;
4158 sectors
-= task
->task_sectors
;
4160 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4161 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4162 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4165 * Now perform the memory map of task->task_sg[] into backend
4166 * subsystem memory..
4168 list_for_each_entry(task
, &cmd
->t_task_list
, t_list
) {
4169 if (atomic_read(&task
->task_sent
))
4171 if (!dev
->transport
->map_data_SG
)
4174 ret
= dev
->transport
->map_data_SG(task
);
4183 transport_allocate_control_task(struct se_cmd
*cmd
)
4185 struct se_device
*dev
= cmd
->se_dev
;
4187 struct se_task
*task
;
4188 unsigned long flags
;
4191 task
= transport_generic_get_task(cmd
, cmd
->data_direction
);
4195 cdb
= dev
->transport
->get_cdb(task
);
4197 memcpy(cdb
, cmd
->t_task_cdb
,
4198 scsi_command_size(cmd
->t_task_cdb
));
4200 task
->task_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
4202 if (!task
->task_sg
) {
4203 cmd
->se_dev
->transport
->free_task(task
);
4207 memcpy(task
->task_sg
, cmd
->t_data_sg
,
4208 sizeof(struct scatterlist
) * cmd
->t_data_nents
);
4209 task
->task_size
= cmd
->data_length
;
4210 task
->task_sg_nents
= cmd
->t_data_nents
;
4212 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4213 list_add_tail(&task
->t_list
, &cmd
->t_task_list
);
4214 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4216 if (cmd
->se_cmd_flags
& SCF_SCSI_CONTROL_SG_IO_CDB
) {
4217 if (dev
->transport
->map_control_SG
)
4218 ret
= dev
->transport
->map_control_SG(task
);
4219 } else if (cmd
->se_cmd_flags
& SCF_SCSI_NON_DATA_CDB
) {
4220 if (dev
->transport
->cdb_none
)
4221 ret
= dev
->transport
->cdb_none(task
);
4223 pr_err("target: Unknown control cmd type!\n");
4227 /* Success! Return number of tasks allocated */
4233 static u32
transport_allocate_tasks(
4235 unsigned long long lba
,
4236 enum dma_data_direction data_direction
,
4237 struct scatterlist
*sgl
,
4238 unsigned int sgl_nents
)
4240 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_SG_IO_CDB
) {
4241 if (transport_cmd_get_valid_sectors(cmd
) < 0)
4244 return transport_allocate_data_tasks(cmd
, lba
, data_direction
,
4247 return transport_allocate_control_task(cmd
);
4252 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4254 * Allocate storage transport resources from a set of values predefined
4255 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4256 * Any non zero return here is treated as an "out of resource' op here.
4259 * Generate struct se_task(s) and/or their payloads for this CDB.
4261 int transport_generic_new_cmd(struct se_cmd
*cmd
)
4266 * Determine is the TCM fabric module has already allocated physical
4267 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4270 if (!(cmd
->se_cmd_flags
& SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
) &&
4272 ret
= transport_generic_get_mem(cmd
);
4277 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4278 * control or data CDB types, and perform the map to backend subsystem
4279 * code from SGL memory allocated here by transport_generic_get_mem(), or
4280 * via pre-existing SGL memory setup explictly by fabric module code with
4281 * transport_generic_map_mem_to_cmd().
4283 ret
= transport_new_cmd_obj(cmd
);
4287 * For WRITEs, let the fabric know its buffer is ready..
4288 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4289 * will be added to the struct se_device execution queue after its WRITE
4290 * data has arrived. (ie: It gets handled by the transport processing
4291 * thread a second time)
4293 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4294 transport_add_tasks_to_state_queue(cmd
);
4295 return transport_generic_write_pending(cmd
);
4298 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4299 * to the execution queue.
4301 transport_execute_tasks(cmd
);
4304 EXPORT_SYMBOL(transport_generic_new_cmd
);
4306 /* transport_generic_process_write():
4310 void transport_generic_process_write(struct se_cmd
*cmd
)
4312 transport_execute_tasks(cmd
);
4314 EXPORT_SYMBOL(transport_generic_process_write
);
4316 static int transport_write_pending_qf(struct se_cmd
*cmd
)
4318 return cmd
->se_tfo
->write_pending(cmd
);
4321 /* transport_generic_write_pending():
4325 static int transport_generic_write_pending(struct se_cmd
*cmd
)
4327 unsigned long flags
;
4330 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4331 cmd
->t_state
= TRANSPORT_WRITE_PENDING
;
4332 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4334 if (cmd
->transport_qf_callback
) {
4335 ret
= cmd
->transport_qf_callback(cmd
);
4341 cmd
->transport_qf_callback
= NULL
;
4346 * Clear the se_cmd for WRITE_PENDING status in order to set
4347 * cmd->t_transport_active=0 so that transport_generic_handle_data
4348 * can be called from HW target mode interrupt code. This is safe
4349 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4350 * because the se_cmd->se_lun pointer is not being cleared.
4352 transport_cmd_check_stop(cmd
, 1, 0);
4355 * Call the fabric write_pending function here to let the
4356 * frontend know that WRITE buffers are ready.
4358 ret
= cmd
->se_tfo
->write_pending(cmd
);
4364 return PYX_TRANSPORT_WRITE_PENDING
;
4367 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd
);
4368 cmd
->t_state
= TRANSPORT_COMPLETE_QF_WP
;
4369 transport_handle_queue_full(cmd
, cmd
->se_dev
,
4370 transport_write_pending_qf
);
4374 void transport_release_cmd(struct se_cmd
*cmd
)
4376 BUG_ON(!cmd
->se_tfo
);
4378 transport_free_se_cmd(cmd
);
4379 cmd
->se_tfo
->release_cmd(cmd
);
4381 EXPORT_SYMBOL(transport_release_cmd
);
4383 /* transport_generic_free_cmd():
4385 * Called from processing frontend to release storage engine resources
4387 void transport_generic_free_cmd(
4390 int session_reinstatement
)
4392 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
))
4393 transport_release_cmd(cmd
);
4395 core_dec_lacl_count(cmd
->se_sess
->se_node_acl
, cmd
);
4399 pr_debug("cmd: %p ITT: 0x%08x contains"
4400 " cmd->se_lun\n", cmd
,
4401 cmd
->se_tfo
->get_task_tag(cmd
));
4403 transport_lun_remove_cmd(cmd
);
4406 if (wait_for_tasks
&& cmd
->transport_wait_for_tasks
)
4407 cmd
->transport_wait_for_tasks(cmd
, 0, 0);
4409 transport_free_dev_tasks(cmd
);
4411 transport_generic_remove(cmd
, session_reinstatement
);
4414 EXPORT_SYMBOL(transport_generic_free_cmd
);
4416 static void transport_nop_wait_for_tasks(
4419 int session_reinstatement
)
4424 /* transport_lun_wait_for_tasks():
4426 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4427 * an struct se_lun to be successfully shutdown.
4429 static int transport_lun_wait_for_tasks(struct se_cmd
*cmd
, struct se_lun
*lun
)
4431 unsigned long flags
;
4434 * If the frontend has already requested this struct se_cmd to
4435 * be stopped, we can safely ignore this struct se_cmd.
4437 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4438 if (atomic_read(&cmd
->t_transport_stop
)) {
4439 atomic_set(&cmd
->transport_lun_stop
, 0);
4440 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4441 " TRUE, skipping\n", cmd
->se_tfo
->get_task_tag(cmd
));
4442 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4443 transport_cmd_check_stop(cmd
, 1, 0);
4446 atomic_set(&cmd
->transport_lun_fe_stop
, 1);
4447 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4449 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4451 ret
= transport_stop_tasks_for_cmd(cmd
);
4453 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4454 " %d\n", cmd
, cmd
->t_task_list_num
, ret
);
4456 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4457 cmd
->se_tfo
->get_task_tag(cmd
));
4458 wait_for_completion(&cmd
->transport_lun_stop_comp
);
4459 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4460 cmd
->se_tfo
->get_task_tag(cmd
));
4462 transport_remove_cmd_from_queue(cmd
, &cmd
->se_dev
->dev_queue_obj
);
4467 static void __transport_clear_lun_from_sessions(struct se_lun
*lun
)
4469 struct se_cmd
*cmd
= NULL
;
4470 unsigned long lun_flags
, cmd_flags
;
4472 * Do exception processing and return CHECK_CONDITION status to the
4475 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4476 while (!list_empty(&lun
->lun_cmd_list
)) {
4477 cmd
= list_first_entry(&lun
->lun_cmd_list
,
4478 struct se_cmd
, se_lun_node
);
4479 list_del(&cmd
->se_lun_node
);
4481 atomic_set(&cmd
->transport_lun_active
, 0);
4483 * This will notify iscsi_target_transport.c:
4484 * transport_cmd_check_stop() that a LUN shutdown is in
4485 * progress for the iscsi_cmd_t.
4487 spin_lock(&cmd
->t_state_lock
);
4488 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4489 "_lun_stop for ITT: 0x%08x\n",
4490 cmd
->se_lun
->unpacked_lun
,
4491 cmd
->se_tfo
->get_task_tag(cmd
));
4492 atomic_set(&cmd
->transport_lun_stop
, 1);
4493 spin_unlock(&cmd
->t_state_lock
);
4495 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4498 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4499 cmd
->se_tfo
->get_task_tag(cmd
),
4500 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
);
4504 * If the Storage engine still owns the iscsi_cmd_t, determine
4505 * and/or stop its context.
4507 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4508 "_lun_wait_for_tasks()\n", cmd
->se_lun
->unpacked_lun
,
4509 cmd
->se_tfo
->get_task_tag(cmd
));
4511 if (transport_lun_wait_for_tasks(cmd
, cmd
->se_lun
) < 0) {
4512 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4516 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4517 "_wait_for_tasks(): SUCCESS\n",
4518 cmd
->se_lun
->unpacked_lun
,
4519 cmd
->se_tfo
->get_task_tag(cmd
));
4521 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4522 if (!atomic_read(&cmd
->transport_dev_active
)) {
4523 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4526 atomic_set(&cmd
->transport_dev_active
, 0);
4527 transport_all_task_dev_remove_state(cmd
);
4528 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4530 transport_free_dev_tasks(cmd
);
4532 * The Storage engine stopped this struct se_cmd before it was
4533 * send to the fabric frontend for delivery back to the
4534 * Initiator Node. Return this SCSI CDB back with an
4535 * CHECK_CONDITION status.
4538 transport_send_check_condition_and_sense(cmd
,
4539 TCM_NON_EXISTENT_LUN
, 0);
4541 * If the fabric frontend is waiting for this iscsi_cmd_t to
4542 * be released, notify the waiting thread now that LU has
4543 * finished accessing it.
4545 spin_lock_irqsave(&cmd
->t_state_lock
, cmd_flags
);
4546 if (atomic_read(&cmd
->transport_lun_fe_stop
)) {
4547 pr_debug("SE_LUN[%d] - Detected FE stop for"
4548 " struct se_cmd: %p ITT: 0x%08x\n",
4550 cmd
, cmd
->se_tfo
->get_task_tag(cmd
));
4552 spin_unlock_irqrestore(&cmd
->t_state_lock
,
4554 transport_cmd_check_stop(cmd
, 1, 0);
4555 complete(&cmd
->transport_lun_fe_stop_comp
);
4556 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4559 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4560 lun
->unpacked_lun
, cmd
->se_tfo
->get_task_tag(cmd
));
4562 spin_unlock_irqrestore(&cmd
->t_state_lock
, cmd_flags
);
4563 spin_lock_irqsave(&lun
->lun_cmd_lock
, lun_flags
);
4565 spin_unlock_irqrestore(&lun
->lun_cmd_lock
, lun_flags
);
4568 static int transport_clear_lun_thread(void *p
)
4570 struct se_lun
*lun
= (struct se_lun
*)p
;
4572 __transport_clear_lun_from_sessions(lun
);
4573 complete(&lun
->lun_shutdown_comp
);
4578 int transport_clear_lun_from_sessions(struct se_lun
*lun
)
4580 struct task_struct
*kt
;
4582 kt
= kthread_run(transport_clear_lun_thread
, lun
,
4583 "tcm_cl_%u", lun
->unpacked_lun
);
4585 pr_err("Unable to start clear_lun thread\n");
4588 wait_for_completion(&lun
->lun_shutdown_comp
);
4593 /* transport_generic_wait_for_tasks():
4595 * Called from frontend or passthrough context to wait for storage engine
4596 * to pause and/or release frontend generated struct se_cmd.
4598 static void transport_generic_wait_for_tasks(
4601 int session_reinstatement
)
4603 unsigned long flags
;
4605 if (!(cmd
->se_cmd_flags
& SCF_SE_LUN_CMD
) && !(cmd
->se_tmr_req
))
4608 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4610 * If we are already stopped due to an external event (ie: LUN shutdown)
4611 * sleep until the connection can have the passed struct se_cmd back.
4612 * The cmd->transport_lun_stopped_sem will be upped by
4613 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4614 * has completed its operation on the struct se_cmd.
4616 if (atomic_read(&cmd
->transport_lun_stop
)) {
4618 pr_debug("wait_for_tasks: Stopping"
4619 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4620 "_stop_comp); for ITT: 0x%08x\n",
4621 cmd
->se_tfo
->get_task_tag(cmd
));
4623 * There is a special case for WRITES where a FE exception +
4624 * LUN shutdown means ConfigFS context is still sleeping on
4625 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4626 * We go ahead and up transport_lun_stop_comp just to be sure
4629 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4630 complete(&cmd
->transport_lun_stop_comp
);
4631 wait_for_completion(&cmd
->transport_lun_fe_stop_comp
);
4632 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4634 transport_all_task_dev_remove_state(cmd
);
4636 * At this point, the frontend who was the originator of this
4637 * struct se_cmd, now owns the structure and can be released through
4638 * normal means below.
4640 pr_debug("wait_for_tasks: Stopped"
4641 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4642 "stop_comp); for ITT: 0x%08x\n",
4643 cmd
->se_tfo
->get_task_tag(cmd
));
4645 atomic_set(&cmd
->transport_lun_stop
, 0);
4647 if (!atomic_read(&cmd
->t_transport_active
) ||
4648 atomic_read(&cmd
->t_transport_aborted
))
4651 atomic_set(&cmd
->t_transport_stop
, 1);
4653 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4654 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4655 " = TRUE\n", cmd
, cmd
->se_tfo
->get_task_tag(cmd
),
4656 cmd
->se_tfo
->get_cmd_state(cmd
), cmd
->t_state
,
4657 cmd
->deferred_t_state
);
4659 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4661 wake_up_interruptible(&cmd
->se_dev
->dev_queue_obj
.thread_wq
);
4663 wait_for_completion(&cmd
->t_transport_stop_comp
);
4665 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4666 atomic_set(&cmd
->t_transport_active
, 0);
4667 atomic_set(&cmd
->t_transport_stop
, 0);
4669 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4670 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4671 cmd
->se_tfo
->get_task_tag(cmd
));
4673 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4677 transport_generic_free_cmd(cmd
, 0, session_reinstatement
);
4680 static int transport_get_sense_codes(
4685 *asc
= cmd
->scsi_asc
;
4686 *ascq
= cmd
->scsi_ascq
;
4691 static int transport_set_sense_codes(
4696 cmd
->scsi_asc
= asc
;
4697 cmd
->scsi_ascq
= ascq
;
4702 int transport_send_check_condition_and_sense(
4707 unsigned char *buffer
= cmd
->sense_buffer
;
4708 unsigned long flags
;
4710 u8 asc
= 0, ascq
= 0;
4712 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4713 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4714 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4717 cmd
->se_cmd_flags
|= SCF_SENT_CHECK_CONDITION
;
4718 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4720 if (!reason
&& from_transport
)
4723 if (!from_transport
)
4724 cmd
->se_cmd_flags
|= SCF_EMULATED_TASK_SENSE
;
4726 * Data Segment and SenseLength of the fabric response PDU.
4728 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4729 * from include/scsi/scsi_cmnd.h
4731 offset
= cmd
->se_tfo
->set_fabric_sense_len(cmd
,
4732 TRANSPORT_SENSE_BUFFER
);
4734 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4735 * SENSE KEY values from include/scsi/scsi.h
4738 case TCM_NON_EXISTENT_LUN
:
4740 buffer
[offset
] = 0x70;
4741 /* ILLEGAL REQUEST */
4742 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4743 /* LOGICAL UNIT NOT SUPPORTED */
4744 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x25;
4746 case TCM_UNSUPPORTED_SCSI_OPCODE
:
4747 case TCM_SECTOR_COUNT_TOO_MANY
:
4749 buffer
[offset
] = 0x70;
4750 /* ILLEGAL REQUEST */
4751 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4752 /* INVALID COMMAND OPERATION CODE */
4753 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x20;
4755 case TCM_UNKNOWN_MODE_PAGE
:
4757 buffer
[offset
] = 0x70;
4758 /* ILLEGAL REQUEST */
4759 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4760 /* INVALID FIELD IN CDB */
4761 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4763 case TCM_CHECK_CONDITION_ABORT_CMD
:
4765 buffer
[offset
] = 0x70;
4766 /* ABORTED COMMAND */
4767 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4768 /* BUS DEVICE RESET FUNCTION OCCURRED */
4769 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x29;
4770 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x03;
4772 case TCM_INCORRECT_AMOUNT_OF_DATA
:
4774 buffer
[offset
] = 0x70;
4775 /* ABORTED COMMAND */
4776 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4778 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4779 /* NOT ENOUGH UNSOLICITED DATA */
4780 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0d;
4782 case TCM_INVALID_CDB_FIELD
:
4784 buffer
[offset
] = 0x70;
4785 /* ABORTED COMMAND */
4786 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4787 /* INVALID FIELD IN CDB */
4788 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x24;
4790 case TCM_INVALID_PARAMETER_LIST
:
4792 buffer
[offset
] = 0x70;
4793 /* ABORTED COMMAND */
4794 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4795 /* INVALID FIELD IN PARAMETER LIST */
4796 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x26;
4798 case TCM_UNEXPECTED_UNSOLICITED_DATA
:
4800 buffer
[offset
] = 0x70;
4801 /* ABORTED COMMAND */
4802 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4804 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x0c;
4805 /* UNEXPECTED_UNSOLICITED_DATA */
4806 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x0c;
4808 case TCM_SERVICE_CRC_ERROR
:
4810 buffer
[offset
] = 0x70;
4811 /* ABORTED COMMAND */
4812 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4813 /* PROTOCOL SERVICE CRC ERROR */
4814 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x47;
4816 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x05;
4818 case TCM_SNACK_REJECTED
:
4820 buffer
[offset
] = 0x70;
4821 /* ABORTED COMMAND */
4822 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ABORTED_COMMAND
;
4824 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x11;
4825 /* FAILED RETRANSMISSION REQUEST */
4826 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = 0x13;
4828 case TCM_WRITE_PROTECTED
:
4830 buffer
[offset
] = 0x70;
4832 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = DATA_PROTECT
;
4833 /* WRITE PROTECTED */
4834 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x27;
4836 case TCM_CHECK_CONDITION_UNIT_ATTENTION
:
4838 buffer
[offset
] = 0x70;
4839 /* UNIT ATTENTION */
4840 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = UNIT_ATTENTION
;
4841 core_scsi3_ua_for_check_condition(cmd
, &asc
, &ascq
);
4842 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4843 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4845 case TCM_CHECK_CONDITION_NOT_READY
:
4847 buffer
[offset
] = 0x70;
4849 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = NOT_READY
;
4850 transport_get_sense_codes(cmd
, &asc
, &ascq
);
4851 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = asc
;
4852 buffer
[offset
+SPC_ASCQ_KEY_OFFSET
] = ascq
;
4854 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
:
4857 buffer
[offset
] = 0x70;
4858 /* ILLEGAL REQUEST */
4859 buffer
[offset
+SPC_SENSE_KEY_OFFSET
] = ILLEGAL_REQUEST
;
4860 /* LOGICAL UNIT COMMUNICATION FAILURE */
4861 buffer
[offset
+SPC_ASC_KEY_OFFSET
] = 0x80;
4865 * This code uses linux/include/scsi/scsi.h SAM status codes!
4867 cmd
->scsi_status
= SAM_STAT_CHECK_CONDITION
;
4869 * Automatically padded, this value is encoded in the fabric's
4870 * data_length response PDU containing the SCSI defined sense data.
4872 cmd
->scsi_sense_length
= TRANSPORT_SENSE_BUFFER
+ offset
;
4875 return cmd
->se_tfo
->queue_status(cmd
);
4877 EXPORT_SYMBOL(transport_send_check_condition_and_sense
);
4879 int transport_check_aborted_status(struct se_cmd
*cmd
, int send_status
)
4883 if (atomic_read(&cmd
->t_transport_aborted
) != 0) {
4885 (cmd
->se_cmd_flags
& SCF_SENT_DELAYED_TAS
))
4888 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4889 " status for CDB: 0x%02x ITT: 0x%08x\n",
4891 cmd
->se_tfo
->get_task_tag(cmd
));
4893 cmd
->se_cmd_flags
|= SCF_SENT_DELAYED_TAS
;
4894 cmd
->se_tfo
->queue_status(cmd
);
4899 EXPORT_SYMBOL(transport_check_aborted_status
);
4901 void transport_send_task_abort(struct se_cmd
*cmd
)
4903 unsigned long flags
;
4905 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
4906 if (cmd
->se_cmd_flags
& SCF_SENT_CHECK_CONDITION
) {
4907 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4910 spin_unlock_irqrestore(&cmd
->t_state_lock
, flags
);
4913 * If there are still expected incoming fabric WRITEs, we wait
4914 * until until they have completed before sending a TASK_ABORTED
4915 * response. This response with TASK_ABORTED status will be
4916 * queued back to fabric module by transport_check_aborted_status().
4918 if (cmd
->data_direction
== DMA_TO_DEVICE
) {
4919 if (cmd
->se_tfo
->write_pending_status(cmd
) != 0) {
4920 atomic_inc(&cmd
->t_transport_aborted
);
4921 smp_mb__after_atomic_inc();
4922 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4923 transport_new_cmd_failure(cmd
);
4927 cmd
->scsi_status
= SAM_STAT_TASK_ABORTED
;
4929 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4930 " ITT: 0x%08x\n", cmd
->t_task_cdb
[0],
4931 cmd
->se_tfo
->get_task_tag(cmd
));
4933 cmd
->se_tfo
->queue_status(cmd
);
4936 /* transport_generic_do_tmr():
4940 int transport_generic_do_tmr(struct se_cmd
*cmd
)
4942 struct se_device
*dev
= cmd
->se_dev
;
4943 struct se_tmr_req
*tmr
= cmd
->se_tmr_req
;
4946 switch (tmr
->function
) {
4947 case TMR_ABORT_TASK
:
4948 tmr
->response
= TMR_FUNCTION_REJECTED
;
4950 case TMR_ABORT_TASK_SET
:
4952 case TMR_CLEAR_TASK_SET
:
4953 tmr
->response
= TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
;
4956 ret
= core_tmr_lun_reset(dev
, tmr
, NULL
, NULL
);
4957 tmr
->response
= (!ret
) ? TMR_FUNCTION_COMPLETE
:
4958 TMR_FUNCTION_REJECTED
;
4960 case TMR_TARGET_WARM_RESET
:
4961 tmr
->response
= TMR_FUNCTION_REJECTED
;
4963 case TMR_TARGET_COLD_RESET
:
4964 tmr
->response
= TMR_FUNCTION_REJECTED
;
4967 pr_err("Uknown TMR function: 0x%02x.\n",
4969 tmr
->response
= TMR_FUNCTION_REJECTED
;
4973 cmd
->t_state
= TRANSPORT_ISTATE_PROCESSING
;
4974 cmd
->se_tfo
->queue_tm_rsp(cmd
);
4976 transport_cmd_check_stop(cmd
, 2, 0);
4981 * Called with spin_lock_irq(&dev->execute_task_lock); held
4984 static struct se_task
*
4985 transport_get_task_from_state_list(struct se_device
*dev
)
4987 struct se_task
*task
;
4989 if (list_empty(&dev
->state_task_list
))
4992 list_for_each_entry(task
, &dev
->state_task_list
, t_state_list
)
4995 list_del(&task
->t_state_list
);
4996 atomic_set(&task
->task_state_active
, 0);
5001 static void transport_processing_shutdown(struct se_device
*dev
)
5004 struct se_task
*task
;
5005 unsigned long flags
;
5007 * Empty the struct se_device's struct se_task state list.
5009 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5010 while ((task
= transport_get_task_from_state_list(dev
))) {
5011 if (!task
->task_se_cmd
) {
5012 pr_err("task->task_se_cmd is NULL!\n");
5015 cmd
= task
->task_se_cmd
;
5017 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
5019 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
5021 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
5022 " i_state: %d, t_state/def_t_state:"
5023 " %d/%d cdb: 0x%02x\n", cmd
, task
,
5024 cmd
->se_tfo
->get_task_tag(cmd
),
5025 cmd
->se_tfo
->get_cmd_state(cmd
),
5026 cmd
->t_state
, cmd
->deferred_t_state
,
5027 cmd
->t_task_cdb
[0]);
5028 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
5029 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5030 " t_transport_stop: %d t_transport_sent: %d\n",
5031 cmd
->se_tfo
->get_task_tag(cmd
),
5032 cmd
->t_task_list_num
,
5033 atomic_read(&cmd
->t_task_cdbs_left
),
5034 atomic_read(&cmd
->t_task_cdbs_sent
),
5035 atomic_read(&cmd
->t_transport_active
),
5036 atomic_read(&cmd
->t_transport_stop
),
5037 atomic_read(&cmd
->t_transport_sent
));
5039 if (atomic_read(&task
->task_active
)) {
5040 atomic_set(&task
->task_stop
, 1);
5041 spin_unlock_irqrestore(
5042 &cmd
->t_state_lock
, flags
);
5044 pr_debug("Waiting for task: %p to shutdown for dev:"
5045 " %p\n", task
, dev
);
5046 wait_for_completion(&task
->task_stop_comp
);
5047 pr_debug("Completed task: %p shutdown for dev: %p\n",
5050 spin_lock_irqsave(&cmd
->t_state_lock
, flags
);
5051 atomic_dec(&cmd
->t_task_cdbs_left
);
5053 atomic_set(&task
->task_active
, 0);
5054 atomic_set(&task
->task_stop
, 0);
5056 if (atomic_read(&task
->task_execute_queue
) != 0)
5057 transport_remove_task_from_execute_queue(task
, dev
);
5059 __transport_stop_task_timer(task
, &flags
);
5061 if (!atomic_dec_and_test(&cmd
->t_task_cdbs_ex_left
)) {
5062 spin_unlock_irqrestore(
5063 &cmd
->t_state_lock
, flags
);
5065 pr_debug("Skipping task: %p, dev: %p for"
5066 " t_task_cdbs_ex_left: %d\n", task
, dev
,
5067 atomic_read(&cmd
->t_task_cdbs_ex_left
));
5069 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5073 if (atomic_read(&cmd
->t_transport_active
)) {
5074 pr_debug("got t_transport_active = 1 for task: %p, dev:"
5075 " %p\n", task
, dev
);
5077 if (atomic_read(&cmd
->t_fe_count
)) {
5078 spin_unlock_irqrestore(
5079 &cmd
->t_state_lock
, flags
);
5080 transport_send_check_condition_and_sense(
5081 cmd
, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
,
5083 transport_remove_cmd_from_queue(cmd
,
5084 &cmd
->se_dev
->dev_queue_obj
);
5086 transport_lun_remove_cmd(cmd
);
5087 transport_cmd_check_stop(cmd
, 1, 0);
5089 spin_unlock_irqrestore(
5090 &cmd
->t_state_lock
, flags
);
5092 transport_remove_cmd_from_queue(cmd
,
5093 &cmd
->se_dev
->dev_queue_obj
);
5095 transport_lun_remove_cmd(cmd
);
5097 if (transport_cmd_check_stop(cmd
, 1, 0))
5098 transport_generic_remove(cmd
, 0);
5101 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5104 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
5107 if (atomic_read(&cmd
->t_fe_count
)) {
5108 spin_unlock_irqrestore(
5109 &cmd
->t_state_lock
, flags
);
5110 transport_send_check_condition_and_sense(cmd
,
5111 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
5112 transport_remove_cmd_from_queue(cmd
,
5113 &cmd
->se_dev
->dev_queue_obj
);
5115 transport_lun_remove_cmd(cmd
);
5116 transport_cmd_check_stop(cmd
, 1, 0);
5118 spin_unlock_irqrestore(
5119 &cmd
->t_state_lock
, flags
);
5121 transport_remove_cmd_from_queue(cmd
,
5122 &cmd
->se_dev
->dev_queue_obj
);
5123 transport_lun_remove_cmd(cmd
);
5125 if (transport_cmd_check_stop(cmd
, 1, 0))
5126 transport_generic_remove(cmd
, 0);
5129 spin_lock_irqsave(&dev
->execute_task_lock
, flags
);
5131 spin_unlock_irqrestore(&dev
->execute_task_lock
, flags
);
5133 * Empty the struct se_device's struct se_cmd list.
5135 while ((cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
))) {
5137 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5140 if (atomic_read(&cmd
->t_fe_count
)) {
5141 transport_send_check_condition_and_sense(cmd
,
5142 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
, 0);
5144 transport_lun_remove_cmd(cmd
);
5145 transport_cmd_check_stop(cmd
, 1, 0);
5147 transport_lun_remove_cmd(cmd
);
5148 if (transport_cmd_check_stop(cmd
, 1, 0))
5149 transport_generic_remove(cmd
, 0);
5154 /* transport_processing_thread():
5158 static int transport_processing_thread(void *param
)
5162 struct se_device
*dev
= (struct se_device
*) param
;
5164 set_user_nice(current
, -20);
5166 while (!kthread_should_stop()) {
5167 ret
= wait_event_interruptible(dev
->dev_queue_obj
.thread_wq
,
5168 atomic_read(&dev
->dev_queue_obj
.queue_cnt
) ||
5169 kthread_should_stop());
5173 spin_lock_irq(&dev
->dev_status_lock
);
5174 if (dev
->dev_status
& TRANSPORT_DEVICE_SHUTDOWN
) {
5175 spin_unlock_irq(&dev
->dev_status_lock
);
5176 transport_processing_shutdown(dev
);
5179 spin_unlock_irq(&dev
->dev_status_lock
);
5182 __transport_execute_tasks(dev
);
5184 cmd
= transport_get_cmd_from_queue(&dev
->dev_queue_obj
);
5188 switch (cmd
->t_state
) {
5189 case TRANSPORT_NEW_CMD
:
5192 case TRANSPORT_NEW_CMD_MAP
:
5193 if (!cmd
->se_tfo
->new_cmd_map
) {
5194 pr_err("cmd->se_tfo->new_cmd_map is"
5195 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5198 ret
= cmd
->se_tfo
->new_cmd_map(cmd
);
5200 cmd
->transport_error_status
= ret
;
5201 transport_generic_request_failure(cmd
, NULL
,
5202 0, (cmd
->data_direction
!=
5206 ret
= transport_generic_new_cmd(cmd
);
5210 cmd
->transport_error_status
= ret
;
5211 transport_generic_request_failure(cmd
, NULL
,
5212 0, (cmd
->data_direction
!=
5216 case TRANSPORT_PROCESS_WRITE
:
5217 transport_generic_process_write(cmd
);
5219 case TRANSPORT_COMPLETE_OK
:
5220 transport_stop_all_task_timers(cmd
);
5221 transport_generic_complete_ok(cmd
);
5223 case TRANSPORT_REMOVE
:
5224 transport_generic_remove(cmd
, 0);
5226 case TRANSPORT_FREE_CMD_INTR
:
5227 transport_generic_free_cmd(cmd
, 0, 0);
5229 case TRANSPORT_PROCESS_TMR
:
5230 transport_generic_do_tmr(cmd
);
5232 case TRANSPORT_COMPLETE_FAILURE
:
5233 transport_generic_request_failure(cmd
, NULL
, 1, 1);
5235 case TRANSPORT_COMPLETE_TIMEOUT
:
5236 transport_stop_all_task_timers(cmd
);
5237 transport_generic_request_timeout(cmd
);
5239 case TRANSPORT_COMPLETE_QF_WP
:
5240 transport_generic_write_pending(cmd
);
5243 pr_err("Unknown t_state: %d deferred_t_state:"
5244 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5245 " %u\n", cmd
->t_state
, cmd
->deferred_t_state
,
5246 cmd
->se_tfo
->get_task_tag(cmd
),
5247 cmd
->se_tfo
->get_cmd_state(cmd
),
5248 cmd
->se_lun
->unpacked_lun
);
5256 transport_release_all_cmds(dev
);
5257 dev
->process_thread
= NULL
;