1 /*******************************************************************************
2 * Filename: target_core_transport.c
4 * This file contains the Generic Target Engine Core.
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 * Nicholas A. Bellinger <nab@kernel.org>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 ******************************************************************************/
29 #include <linux/net.h>
30 #include <linux/delay.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
38 #include <linux/cdrom.h>
39 #include <linux/module.h>
40 #include <linux/ratelimit.h>
41 #include <asm/unaligned.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/scsi_tcq.h>
48 #include <target/target_core_base.h>
49 #include <target/target_core_backend.h>
50 #include <target/target_core_fabric.h>
51 #include <target/target_core_configfs.h>
53 #include "target_core_internal.h"
54 #include "target_core_alua.h"
55 #include "target_core_pr.h"
56 #include "target_core_ua.h"
58 static int sub_api_initialized;
60 static struct workqueue_struct *target_completion_wq;
61 static struct kmem_cache *se_sess_cache;
62 struct kmem_cache *se_ua_cache;
63 struct kmem_cache *t10_pr_reg_cache;
64 struct kmem_cache *t10_alua_lu_gp_cache;
65 struct kmem_cache *t10_alua_lu_gp_mem_cache;
66 struct kmem_cache *t10_alua_tg_pt_gp_cache;
67 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
69 static int transport_generic_write_pending(struct se_cmd *);
70 static int transport_processing_thread(void *param);
71 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
72 static void transport_complete_task_attr(struct se_cmd *cmd);
73 static void transport_handle_queue_full(struct se_cmd *cmd,
74 struct se_device *dev);
75 static int transport_generic_get_mem(struct se_cmd *cmd);
76 static void transport_put_cmd(struct se_cmd *cmd);
77 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
78 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
79 static void target_complete_ok_work(struct work_struct *work);
81 int init_se_kmem_caches(void)
83 se_sess_cache = kmem_cache_create("se_sess_cache",
84 sizeof(struct se_session), __alignof__(struct se_session),
87 pr_err("kmem_cache_create() for struct se_session"
91 se_ua_cache = kmem_cache_create("se_ua_cache",
92 sizeof(struct se_ua), __alignof__(struct se_ua),
95 pr_err("kmem_cache_create() for struct se_ua failed\n");
96 goto out_free_sess_cache;
98 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
99 sizeof(struct t10_pr_registration),
100 __alignof__(struct t10_pr_registration), 0, NULL);
101 if (!t10_pr_reg_cache) {
102 pr_err("kmem_cache_create() for struct t10_pr_registration"
104 goto out_free_ua_cache;
106 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
107 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
109 if (!t10_alua_lu_gp_cache) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
112 goto out_free_pr_reg_cache;
114 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
115 sizeof(struct t10_alua_lu_gp_member),
116 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
117 if (!t10_alua_lu_gp_mem_cache) {
118 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
120 goto out_free_lu_gp_cache;
122 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
123 sizeof(struct t10_alua_tg_pt_gp),
124 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
125 if (!t10_alua_tg_pt_gp_cache) {
126 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
128 goto out_free_lu_gp_mem_cache;
130 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
131 "t10_alua_tg_pt_gp_mem_cache",
132 sizeof(struct t10_alua_tg_pt_gp_member),
133 __alignof__(struct t10_alua_tg_pt_gp_member),
135 if (!t10_alua_tg_pt_gp_mem_cache) {
136 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
138 goto out_free_tg_pt_gp_cache;
141 target_completion_wq = alloc_workqueue("target_completion",
143 if (!target_completion_wq)
144 goto out_free_tg_pt_gp_mem_cache;
148 out_free_tg_pt_gp_mem_cache:
149 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
150 out_free_tg_pt_gp_cache:
151 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
152 out_free_lu_gp_mem_cache:
153 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
154 out_free_lu_gp_cache:
155 kmem_cache_destroy(t10_alua_lu_gp_cache);
156 out_free_pr_reg_cache:
157 kmem_cache_destroy(t10_pr_reg_cache);
159 kmem_cache_destroy(se_ua_cache);
161 kmem_cache_destroy(se_sess_cache);
166 void release_se_kmem_caches(void)
168 destroy_workqueue(target_completion_wq);
169 kmem_cache_destroy(se_sess_cache);
170 kmem_cache_destroy(se_ua_cache);
171 kmem_cache_destroy(t10_pr_reg_cache);
172 kmem_cache_destroy(t10_alua_lu_gp_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
174 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
178 /* This code ensures unique mib indexes are handed out. */
179 static DEFINE_SPINLOCK(scsi_mib_index_lock);
180 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
183 * Allocate a new row index for the entry type specified
185 u32 scsi_get_new_index(scsi_index_t type)
189 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
191 spin_lock(&scsi_mib_index_lock);
192 new_index = ++scsi_mib_index[type];
193 spin_unlock(&scsi_mib_index_lock);
198 static void transport_init_queue_obj(struct se_queue_obj *qobj)
200 atomic_set(&qobj->queue_cnt, 0);
201 INIT_LIST_HEAD(&qobj->qobj_list);
202 init_waitqueue_head(&qobj->thread_wq);
203 spin_lock_init(&qobj->cmd_queue_lock);
206 void transport_subsystem_check_init(void)
210 if (sub_api_initialized)
213 ret = request_module("target_core_iblock");
215 pr_err("Unable to load target_core_iblock\n");
217 ret = request_module("target_core_file");
219 pr_err("Unable to load target_core_file\n");
221 ret = request_module("target_core_pscsi");
223 pr_err("Unable to load target_core_pscsi\n");
225 ret = request_module("target_core_stgt");
227 pr_err("Unable to load target_core_stgt\n");
229 sub_api_initialized = 1;
233 struct se_session *transport_init_session(void)
235 struct se_session *se_sess;
237 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
239 pr_err("Unable to allocate struct se_session from"
241 return ERR_PTR(-ENOMEM);
243 INIT_LIST_HEAD(&se_sess->sess_list);
244 INIT_LIST_HEAD(&se_sess->sess_acl_list);
245 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
246 INIT_LIST_HEAD(&se_sess->sess_wait_list);
247 spin_lock_init(&se_sess->sess_cmd_lock);
248 kref_init(&se_sess->sess_kref);
252 EXPORT_SYMBOL(transport_init_session);
255 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
257 void __transport_register_session(
258 struct se_portal_group *se_tpg,
259 struct se_node_acl *se_nacl,
260 struct se_session *se_sess,
261 void *fabric_sess_ptr)
263 unsigned char buf[PR_REG_ISID_LEN];
265 se_sess->se_tpg = se_tpg;
266 se_sess->fabric_sess_ptr = fabric_sess_ptr;
268 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
270 * Only set for struct se_session's that will actually be moving I/O.
271 * eg: *NOT* discovery sessions.
275 * If the fabric module supports an ISID based TransportID,
276 * save this value in binary from the fabric I_T Nexus now.
278 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
279 memset(&buf[0], 0, PR_REG_ISID_LEN);
280 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
281 &buf[0], PR_REG_ISID_LEN);
282 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
284 kref_get(&se_nacl->acl_kref);
286 spin_lock_irq(&se_nacl->nacl_sess_lock);
288 * The se_nacl->nacl_sess pointer will be set to the
289 * last active I_T Nexus for each struct se_node_acl.
291 se_nacl->nacl_sess = se_sess;
293 list_add_tail(&se_sess->sess_acl_list,
294 &se_nacl->acl_sess_list);
295 spin_unlock_irq(&se_nacl->nacl_sess_lock);
297 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
299 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
300 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
302 EXPORT_SYMBOL(__transport_register_session);
304 void transport_register_session(
305 struct se_portal_group *se_tpg,
306 struct se_node_acl *se_nacl,
307 struct se_session *se_sess,
308 void *fabric_sess_ptr)
312 spin_lock_irqsave(&se_tpg->session_lock, flags);
313 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
314 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
316 EXPORT_SYMBOL(transport_register_session);
318 void target_release_session(struct kref *kref)
320 struct se_session *se_sess = container_of(kref,
321 struct se_session, sess_kref);
322 struct se_portal_group *se_tpg = se_sess->se_tpg;
324 se_tpg->se_tpg_tfo->close_session(se_sess);
327 void target_get_session(struct se_session *se_sess)
329 kref_get(&se_sess->sess_kref);
331 EXPORT_SYMBOL(target_get_session);
333 void target_put_session(struct se_session *se_sess)
335 struct se_portal_group *tpg = se_sess->se_tpg;
337 if (tpg->se_tpg_tfo->put_session != NULL) {
338 tpg->se_tpg_tfo->put_session(se_sess);
341 kref_put(&se_sess->sess_kref, target_release_session);
343 EXPORT_SYMBOL(target_put_session);
345 static void target_complete_nacl(struct kref *kref)
347 struct se_node_acl *nacl = container_of(kref,
348 struct se_node_acl, acl_kref);
350 complete(&nacl->acl_free_comp);
353 void target_put_nacl(struct se_node_acl *nacl)
355 kref_put(&nacl->acl_kref, target_complete_nacl);
358 void transport_deregister_session_configfs(struct se_session *se_sess)
360 struct se_node_acl *se_nacl;
363 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
365 se_nacl = se_sess->se_node_acl;
367 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
368 if (se_nacl->acl_stop == 0)
369 list_del(&se_sess->sess_acl_list);
371 * If the session list is empty, then clear the pointer.
372 * Otherwise, set the struct se_session pointer from the tail
373 * element of the per struct se_node_acl active session list.
375 if (list_empty(&se_nacl->acl_sess_list))
376 se_nacl->nacl_sess = NULL;
378 se_nacl->nacl_sess = container_of(
379 se_nacl->acl_sess_list.prev,
380 struct se_session, sess_acl_list);
382 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
385 EXPORT_SYMBOL(transport_deregister_session_configfs);
387 void transport_free_session(struct se_session *se_sess)
389 kmem_cache_free(se_sess_cache, se_sess);
391 EXPORT_SYMBOL(transport_free_session);
393 void transport_deregister_session(struct se_session *se_sess)
395 struct se_portal_group *se_tpg = se_sess->se_tpg;
396 struct target_core_fabric_ops *se_tfo;
397 struct se_node_acl *se_nacl;
399 bool comp_nacl = true;
402 transport_free_session(se_sess);
405 se_tfo = se_tpg->se_tpg_tfo;
407 spin_lock_irqsave(&se_tpg->session_lock, flags);
408 list_del(&se_sess->sess_list);
409 se_sess->se_tpg = NULL;
410 se_sess->fabric_sess_ptr = NULL;
411 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
414 * Determine if we need to do extra work for this initiator node's
415 * struct se_node_acl if it had been previously dynamically generated.
417 se_nacl = se_sess->se_node_acl;
419 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
420 if (se_nacl && se_nacl->dynamic_node_acl) {
421 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
422 list_del(&se_nacl->acl_list);
423 se_tpg->num_node_acls--;
424 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
425 core_tpg_wait_for_nacl_pr_ref(se_nacl);
426 core_free_device_list_for_node(se_nacl, se_tpg);
427 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
430 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
433 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
435 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
436 se_tpg->se_tpg_tfo->get_fabric_name());
438 * If last kref is dropping now for an explict NodeACL, awake sleeping
439 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
442 if (se_nacl && comp_nacl == true)
443 target_put_nacl(se_nacl);
445 transport_free_session(se_sess);
447 EXPORT_SYMBOL(transport_deregister_session);
450 * Called with cmd->t_state_lock held.
452 static void target_remove_from_state_list(struct se_cmd *cmd)
454 struct se_device *dev = cmd->se_dev;
460 if (cmd->transport_state & CMD_T_BUSY)
463 spin_lock_irqsave(&dev->execute_task_lock, flags);
464 if (cmd->state_active) {
465 list_del(&cmd->state_list);
466 cmd->state_active = false;
468 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
471 /* transport_cmd_check_stop():
473 * 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
474 * 'transport_off = 2' determines if task_dev_state should be removed.
476 * A non-zero u8 t_state sets cmd->t_state.
477 * Returns 1 when command is stopped, else 0.
479 static int transport_cmd_check_stop(
486 spin_lock_irqsave(&cmd->t_state_lock, flags);
488 * Determine if IOCTL context caller in requesting the stopping of this
489 * command for LUN shutdown purposes.
491 if (cmd->transport_state & CMD_T_LUN_STOP) {
492 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
493 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
495 cmd->transport_state &= ~CMD_T_ACTIVE;
496 if (transport_off == 2)
497 target_remove_from_state_list(cmd);
498 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
500 complete(&cmd->transport_lun_stop_comp);
504 * Determine if frontend context caller is requesting the stopping of
505 * this command for frontend exceptions.
507 if (cmd->transport_state & CMD_T_STOP) {
508 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
510 cmd->se_tfo->get_task_tag(cmd));
512 if (transport_off == 2)
513 target_remove_from_state_list(cmd);
516 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
519 if (transport_off == 2)
521 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
523 complete(&cmd->t_transport_stop_comp);
527 cmd->transport_state &= ~CMD_T_ACTIVE;
528 if (transport_off == 2) {
529 target_remove_from_state_list(cmd);
531 * Clear struct se_cmd->se_lun before the transport_off == 2
532 * handoff to fabric module.
536 * Some fabric modules like tcm_loop can release
537 * their internally allocated I/O reference now and
540 * Fabric modules are expected to return '1' here if the
541 * se_cmd being passed is released at this point,
542 * or zero if not being released.
544 if (cmd->se_tfo->check_stop_free != NULL) {
545 spin_unlock_irqrestore(
546 &cmd->t_state_lock, flags);
548 return cmd->se_tfo->check_stop_free(cmd);
551 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
555 cmd->t_state = t_state;
556 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
561 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
563 return transport_cmd_check_stop(cmd, 2, 0);
566 static void transport_lun_remove_cmd(struct se_cmd *cmd)
568 struct se_lun *lun = cmd->se_lun;
574 spin_lock_irqsave(&cmd->t_state_lock, flags);
575 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
576 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
577 target_remove_from_state_list(cmd);
579 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
581 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
582 if (!list_empty(&cmd->se_lun_node))
583 list_del_init(&cmd->se_lun_node);
584 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
587 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
589 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
590 transport_lun_remove_cmd(cmd);
592 if (transport_cmd_check_stop_to_fabric(cmd))
595 transport_remove_cmd_from_queue(cmd);
596 transport_put_cmd(cmd);
600 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
603 struct se_device *dev = cmd->se_dev;
604 struct se_queue_obj *qobj = &dev->dev_queue_obj;
608 spin_lock_irqsave(&cmd->t_state_lock, flags);
609 cmd->t_state = t_state;
610 cmd->transport_state |= CMD_T_ACTIVE;
611 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
614 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
616 /* If the cmd is already on the list, remove it before we add it */
617 if (!list_empty(&cmd->se_queue_node))
618 list_del(&cmd->se_queue_node);
620 atomic_inc(&qobj->queue_cnt);
623 list_add(&cmd->se_queue_node, &qobj->qobj_list);
625 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
626 cmd->transport_state |= CMD_T_QUEUED;
627 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
629 wake_up_interruptible(&qobj->thread_wq);
632 static struct se_cmd *
633 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
638 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
639 if (list_empty(&qobj->qobj_list)) {
640 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
643 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
645 cmd->transport_state &= ~CMD_T_QUEUED;
646 list_del_init(&cmd->se_queue_node);
647 atomic_dec(&qobj->queue_cnt);
648 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
653 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
655 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
658 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
659 if (!(cmd->transport_state & CMD_T_QUEUED)) {
660 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
663 cmd->transport_state &= ~CMD_T_QUEUED;
664 atomic_dec(&qobj->queue_cnt);
665 list_del_init(&cmd->se_queue_node);
666 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
669 static void target_complete_failure_work(struct work_struct *work)
671 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
673 transport_generic_request_failure(cmd);
676 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
678 struct se_device *dev = cmd->se_dev;
679 int success = scsi_status == GOOD;
682 cmd->scsi_status = scsi_status;
685 spin_lock_irqsave(&cmd->t_state_lock, flags);
686 cmd->transport_state &= ~CMD_T_BUSY;
688 if (dev && dev->transport->transport_complete) {
689 if (dev->transport->transport_complete(cmd,
690 cmd->t_data_sg) != 0) {
691 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
697 * See if we are waiting to complete for an exception condition.
699 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
700 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
701 complete(&cmd->task_stop_comp);
706 cmd->transport_state |= CMD_T_FAILED;
709 * Check for case where an explict ABORT_TASK has been received
710 * and transport_wait_for_tasks() will be waiting for completion..
712 if (cmd->transport_state & CMD_T_ABORTED &&
713 cmd->transport_state & CMD_T_STOP) {
714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
715 complete(&cmd->t_transport_stop_comp);
717 } else if (cmd->transport_state & CMD_T_FAILED) {
718 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
719 INIT_WORK(&cmd->work, target_complete_failure_work);
721 INIT_WORK(&cmd->work, target_complete_ok_work);
724 cmd->t_state = TRANSPORT_COMPLETE;
725 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
726 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
728 queue_work(target_completion_wq, &cmd->work);
730 EXPORT_SYMBOL(target_complete_cmd);
732 static void target_add_to_state_list(struct se_cmd *cmd)
734 struct se_device *dev = cmd->se_dev;
737 spin_lock_irqsave(&dev->execute_task_lock, flags);
738 if (!cmd->state_active) {
739 list_add_tail(&cmd->state_list, &dev->state_list);
740 cmd->state_active = true;
742 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
745 static void __target_add_to_execute_list(struct se_cmd *cmd)
747 struct se_device *dev = cmd->se_dev;
748 bool head_of_queue = false;
750 if (!list_empty(&cmd->execute_list))
753 if (dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED &&
754 cmd->sam_task_attr == MSG_HEAD_TAG)
755 head_of_queue = true;
758 list_add(&cmd->execute_list, &dev->execute_list);
760 list_add_tail(&cmd->execute_list, &dev->execute_list);
762 atomic_inc(&dev->execute_tasks);
764 if (cmd->state_active)
768 list_add(&cmd->state_list, &dev->state_list);
770 list_add_tail(&cmd->state_list, &dev->state_list);
772 cmd->state_active = true;
775 static void target_add_to_execute_list(struct se_cmd *cmd)
778 struct se_device *dev = cmd->se_dev;
780 spin_lock_irqsave(&dev->execute_task_lock, flags);
781 __target_add_to_execute_list(cmd);
782 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
785 void __target_remove_from_execute_list(struct se_cmd *cmd)
787 list_del_init(&cmd->execute_list);
788 atomic_dec(&cmd->se_dev->execute_tasks);
791 static void target_remove_from_execute_list(struct se_cmd *cmd)
793 struct se_device *dev = cmd->se_dev;
796 if (WARN_ON(list_empty(&cmd->execute_list)))
799 spin_lock_irqsave(&dev->execute_task_lock, flags);
800 __target_remove_from_execute_list(cmd);
801 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
805 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
808 static void target_qf_do_work(struct work_struct *work)
810 struct se_device *dev = container_of(work, struct se_device,
812 LIST_HEAD(qf_cmd_list);
813 struct se_cmd *cmd, *cmd_tmp;
815 spin_lock_irq(&dev->qf_cmd_lock);
816 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
817 spin_unlock_irq(&dev->qf_cmd_lock);
819 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
820 list_del(&cmd->se_qf_node);
821 atomic_dec(&dev->dev_qf_count);
822 smp_mb__after_atomic_dec();
824 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
825 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
826 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
827 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
830 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
834 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
836 switch (cmd->data_direction) {
839 case DMA_FROM_DEVICE:
843 case DMA_BIDIRECTIONAL:
852 void transport_dump_dev_state(
853 struct se_device *dev,
857 *bl += sprintf(b + *bl, "Status: ");
858 switch (dev->dev_status) {
859 case TRANSPORT_DEVICE_ACTIVATED:
860 *bl += sprintf(b + *bl, "ACTIVATED");
862 case TRANSPORT_DEVICE_DEACTIVATED:
863 *bl += sprintf(b + *bl, "DEACTIVATED");
865 case TRANSPORT_DEVICE_SHUTDOWN:
866 *bl += sprintf(b + *bl, "SHUTDOWN");
868 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
869 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
870 *bl += sprintf(b + *bl, "OFFLINE");
873 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
877 *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
878 atomic_read(&dev->execute_tasks), dev->queue_depth);
879 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
880 dev->se_sub_dev->se_dev_attrib.block_size,
881 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
882 *bl += sprintf(b + *bl, " ");
885 void transport_dump_vpd_proto_id(
887 unsigned char *p_buf,
890 unsigned char buf[VPD_TMP_BUF_SIZE];
893 memset(buf, 0, VPD_TMP_BUF_SIZE);
894 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
896 switch (vpd->protocol_identifier) {
898 sprintf(buf+len, "Fibre Channel\n");
901 sprintf(buf+len, "Parallel SCSI\n");
904 sprintf(buf+len, "SSA\n");
907 sprintf(buf+len, "IEEE 1394\n");
910 sprintf(buf+len, "SCSI Remote Direct Memory Access"
914 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
917 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
920 sprintf(buf+len, "Automation/Drive Interface Transport"
924 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
927 sprintf(buf+len, "Unknown 0x%02x\n",
928 vpd->protocol_identifier);
933 strncpy(p_buf, buf, p_buf_len);
939 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
942 * Check if the Protocol Identifier Valid (PIV) bit is set..
944 * from spc3r23.pdf section 7.5.1
946 if (page_83[1] & 0x80) {
947 vpd->protocol_identifier = (page_83[0] & 0xf0);
948 vpd->protocol_identifier_set = 1;
949 transport_dump_vpd_proto_id(vpd, NULL, 0);
952 EXPORT_SYMBOL(transport_set_vpd_proto_id);
954 int transport_dump_vpd_assoc(
956 unsigned char *p_buf,
959 unsigned char buf[VPD_TMP_BUF_SIZE];
963 memset(buf, 0, VPD_TMP_BUF_SIZE);
964 len = sprintf(buf, "T10 VPD Identifier Association: ");
966 switch (vpd->association) {
968 sprintf(buf+len, "addressed logical unit\n");
971 sprintf(buf+len, "target port\n");
974 sprintf(buf+len, "SCSI target device\n");
977 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
983 strncpy(p_buf, buf, p_buf_len);
990 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
993 * The VPD identification association..
995 * from spc3r23.pdf Section 7.6.3.1 Table 297
997 vpd->association = (page_83[1] & 0x30);
998 return transport_dump_vpd_assoc(vpd, NULL, 0);
1000 EXPORT_SYMBOL(transport_set_vpd_assoc);
1002 int transport_dump_vpd_ident_type(
1003 struct t10_vpd *vpd,
1004 unsigned char *p_buf,
1007 unsigned char buf[VPD_TMP_BUF_SIZE];
1011 memset(buf, 0, VPD_TMP_BUF_SIZE);
1012 len = sprintf(buf, "T10 VPD Identifier Type: ");
1014 switch (vpd->device_identifier_type) {
1016 sprintf(buf+len, "Vendor specific\n");
1019 sprintf(buf+len, "T10 Vendor ID based\n");
1022 sprintf(buf+len, "EUI-64 based\n");
1025 sprintf(buf+len, "NAA\n");
1028 sprintf(buf+len, "Relative target port identifier\n");
1031 sprintf(buf+len, "SCSI name string\n");
1034 sprintf(buf+len, "Unsupported: 0x%02x\n",
1035 vpd->device_identifier_type);
1041 if (p_buf_len < strlen(buf)+1)
1043 strncpy(p_buf, buf, p_buf_len);
1045 pr_debug("%s", buf);
1051 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1054 * The VPD identifier type..
1056 * from spc3r23.pdf Section 7.6.3.1 Table 298
1058 vpd->device_identifier_type = (page_83[1] & 0x0f);
1059 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1061 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1063 int transport_dump_vpd_ident(
1064 struct t10_vpd *vpd,
1065 unsigned char *p_buf,
1068 unsigned char buf[VPD_TMP_BUF_SIZE];
1071 memset(buf, 0, VPD_TMP_BUF_SIZE);
1073 switch (vpd->device_identifier_code_set) {
1074 case 0x01: /* Binary */
1075 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1076 &vpd->device_identifier[0]);
1078 case 0x02: /* ASCII */
1079 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1080 &vpd->device_identifier[0]);
1082 case 0x03: /* UTF-8 */
1083 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1084 &vpd->device_identifier[0]);
1087 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1088 " 0x%02x", vpd->device_identifier_code_set);
1094 strncpy(p_buf, buf, p_buf_len);
1096 pr_debug("%s", buf);
1102 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1104 static const char hex_str[] = "0123456789abcdef";
1105 int j = 0, i = 4; /* offset to start of the identifer */
1108 * The VPD Code Set (encoding)
1110 * from spc3r23.pdf Section 7.6.3.1 Table 296
1112 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1113 switch (vpd->device_identifier_code_set) {
1114 case 0x01: /* Binary */
1115 vpd->device_identifier[j++] =
1116 hex_str[vpd->device_identifier_type];
1117 while (i < (4 + page_83[3])) {
1118 vpd->device_identifier[j++] =
1119 hex_str[(page_83[i] & 0xf0) >> 4];
1120 vpd->device_identifier[j++] =
1121 hex_str[page_83[i] & 0x0f];
1125 case 0x02: /* ASCII */
1126 case 0x03: /* UTF-8 */
1127 while (i < (4 + page_83[3]))
1128 vpd->device_identifier[j++] = page_83[i++];
1134 return transport_dump_vpd_ident(vpd, NULL, 0);
1136 EXPORT_SYMBOL(transport_set_vpd_ident);
1138 static void core_setup_task_attr_emulation(struct se_device *dev)
1141 * If this device is from Target_Core_Mod/pSCSI, disable the
1142 * SAM Task Attribute emulation.
1144 * This is currently not available in upsream Linux/SCSI Target
1145 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1147 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1148 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1152 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1153 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1154 " device\n", dev->transport->name,
1155 dev->transport->get_device_rev(dev));
1158 static void scsi_dump_inquiry(struct se_device *dev)
1160 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1164 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1166 for (i = 0; i < 8; i++)
1167 if (wwn->vendor[i] >= 0x20)
1168 buf[i] = wwn->vendor[i];
1172 pr_debug(" Vendor: %s\n", buf);
1174 for (i = 0; i < 16; i++)
1175 if (wwn->model[i] >= 0x20)
1176 buf[i] = wwn->model[i];
1180 pr_debug(" Model: %s\n", buf);
1182 for (i = 0; i < 4; i++)
1183 if (wwn->revision[i] >= 0x20)
1184 buf[i] = wwn->revision[i];
1188 pr_debug(" Revision: %s\n", buf);
1190 device_type = dev->transport->get_device_type(dev);
1191 pr_debug(" Type: %s ", scsi_device_type(device_type));
1192 pr_debug(" ANSI SCSI revision: %02x\n",
1193 dev->transport->get_device_rev(dev));
1196 struct se_device *transport_add_device_to_core_hba(
1198 struct se_subsystem_api *transport,
1199 struct se_subsystem_dev *se_dev,
1201 void *transport_dev,
1202 struct se_dev_limits *dev_limits,
1203 const char *inquiry_prod,
1204 const char *inquiry_rev)
1207 struct se_device *dev;
1209 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1211 pr_err("Unable to allocate memory for se_dev_t\n");
1215 transport_init_queue_obj(&dev->dev_queue_obj);
1216 dev->dev_flags = device_flags;
1217 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1218 dev->dev_ptr = transport_dev;
1220 dev->se_sub_dev = se_dev;
1221 dev->transport = transport;
1222 INIT_LIST_HEAD(&dev->dev_list);
1223 INIT_LIST_HEAD(&dev->dev_sep_list);
1224 INIT_LIST_HEAD(&dev->dev_tmr_list);
1225 INIT_LIST_HEAD(&dev->execute_list);
1226 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1227 INIT_LIST_HEAD(&dev->state_list);
1228 INIT_LIST_HEAD(&dev->qf_cmd_list);
1229 spin_lock_init(&dev->execute_task_lock);
1230 spin_lock_init(&dev->delayed_cmd_lock);
1231 spin_lock_init(&dev->dev_reservation_lock);
1232 spin_lock_init(&dev->dev_status_lock);
1233 spin_lock_init(&dev->se_port_lock);
1234 spin_lock_init(&dev->se_tmr_lock);
1235 spin_lock_init(&dev->qf_cmd_lock);
1236 atomic_set(&dev->dev_ordered_id, 0);
1238 se_dev_set_default_attribs(dev, dev_limits);
1240 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1241 dev->creation_time = get_jiffies_64();
1242 spin_lock_init(&dev->stats_lock);
1244 spin_lock(&hba->device_lock);
1245 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1247 spin_unlock(&hba->device_lock);
1249 * Setup the SAM Task Attribute emulation for struct se_device
1251 core_setup_task_attr_emulation(dev);
1253 * Force PR and ALUA passthrough emulation with internal object use.
1255 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1257 * Setup the Reservations infrastructure for struct se_device
1259 core_setup_reservations(dev, force_pt);
1261 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1263 if (core_setup_alua(dev, force_pt) < 0)
1267 * Startup the struct se_device processing thread
1269 dev->process_thread = kthread_run(transport_processing_thread, dev,
1270 "LIO_%s", dev->transport->name);
1271 if (IS_ERR(dev->process_thread)) {
1272 pr_err("Unable to create kthread: LIO_%s\n",
1273 dev->transport->name);
1277 * Setup work_queue for QUEUE_FULL
1279 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1281 * Preload the initial INQUIRY const values if we are doing
1282 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1283 * passthrough because this is being provided by the backend LLD.
1284 * This is required so that transport_get_inquiry() copies these
1285 * originals once back into DEV_T10_WWN(dev) for the virtual device
1288 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1289 if (!inquiry_prod || !inquiry_rev) {
1290 pr_err("All non TCM/pSCSI plugins require"
1291 " INQUIRY consts\n");
1295 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1296 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1297 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1299 scsi_dump_inquiry(dev);
1303 kthread_stop(dev->process_thread);
1305 spin_lock(&hba->device_lock);
1306 list_del(&dev->dev_list);
1308 spin_unlock(&hba->device_lock);
1310 se_release_vpd_for_dev(dev);
1316 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1318 /* transport_generic_prepare_cdb():
1320 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1321 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1322 * The point of this is since we are mapping iSCSI LUNs to
1323 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1324 * devices and HBAs for a loop.
1326 static inline void transport_generic_prepare_cdb(
1330 case READ_10: /* SBC - RDProtect */
1331 case READ_12: /* SBC - RDProtect */
1332 case READ_16: /* SBC - RDProtect */
1333 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1334 case VERIFY: /* SBC - VRProtect */
1335 case VERIFY_16: /* SBC - VRProtect */
1336 case WRITE_VERIFY: /* SBC - VRProtect */
1337 case WRITE_VERIFY_12: /* SBC - VRProtect */
1338 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1341 cdb[1] &= 0x1f; /* clear logical unit number */
1346 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1349 * Used by fabric modules containing a local struct se_cmd within their
1350 * fabric dependent per I/O descriptor.
1352 void transport_init_se_cmd(
1354 struct target_core_fabric_ops *tfo,
1355 struct se_session *se_sess,
1359 unsigned char *sense_buffer)
1361 INIT_LIST_HEAD(&cmd->se_lun_node);
1362 INIT_LIST_HEAD(&cmd->se_delayed_node);
1363 INIT_LIST_HEAD(&cmd->se_qf_node);
1364 INIT_LIST_HEAD(&cmd->se_queue_node);
1365 INIT_LIST_HEAD(&cmd->se_cmd_list);
1366 INIT_LIST_HEAD(&cmd->execute_list);
1367 INIT_LIST_HEAD(&cmd->state_list);
1368 init_completion(&cmd->transport_lun_fe_stop_comp);
1369 init_completion(&cmd->transport_lun_stop_comp);
1370 init_completion(&cmd->t_transport_stop_comp);
1371 init_completion(&cmd->cmd_wait_comp);
1372 init_completion(&cmd->task_stop_comp);
1373 spin_lock_init(&cmd->t_state_lock);
1374 cmd->transport_state = CMD_T_DEV_ACTIVE;
1377 cmd->se_sess = se_sess;
1378 cmd->data_length = data_length;
1379 cmd->data_direction = data_direction;
1380 cmd->sam_task_attr = task_attr;
1381 cmd->sense_buffer = sense_buffer;
1383 cmd->state_active = false;
1385 EXPORT_SYMBOL(transport_init_se_cmd);
1387 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1390 * Check if SAM Task Attribute emulation is enabled for this
1391 * struct se_device storage object
1393 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1396 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1397 pr_debug("SAM Task Attribute ACA"
1398 " emulation is not supported\n");
1402 * Used to determine when ORDERED commands should go from
1403 * Dormant to Active status.
1405 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1406 smp_mb__after_atomic_inc();
1407 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1408 cmd->se_ordered_id, cmd->sam_task_attr,
1409 cmd->se_dev->transport->name);
1413 /* target_setup_cmd_from_cdb():
1415 * Called from fabric RX Thread.
1417 int target_setup_cmd_from_cdb(
1423 transport_generic_prepare_cdb(cdb);
1425 * Ensure that the received CDB is less than the max (252 + 8) bytes
1426 * for VARIABLE_LENGTH_CMD
1428 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1429 pr_err("Received SCSI CDB with command_size: %d that"
1430 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1431 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1432 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1433 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1437 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1438 * allocate the additional extended CDB buffer now.. Otherwise
1439 * setup the pointer from __t_task_cdb to t_task_cdb.
1441 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1442 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1444 if (!cmd->t_task_cdb) {
1445 pr_err("Unable to allocate cmd->t_task_cdb"
1446 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1447 scsi_command_size(cdb),
1448 (unsigned long)sizeof(cmd->__t_task_cdb));
1449 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1450 cmd->scsi_sense_reason =
1451 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1455 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1457 * Copy the original CDB into cmd->
1459 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1461 * Setup the received CDB based on SCSI defined opcodes and
1462 * perform unit attention, persistent reservations and ALUA
1463 * checks for virtual device backends. The cmd->t_task_cdb
1464 * pointer is expected to be setup before we reach this point.
1466 ret = transport_generic_cmd_sequencer(cmd, cdb);
1470 * Check for SAM Task Attribute Emulation
1472 if (transport_check_alloc_task_attr(cmd) < 0) {
1473 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1474 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1477 spin_lock(&cmd->se_lun->lun_sep_lock);
1478 if (cmd->se_lun->lun_sep)
1479 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1480 spin_unlock(&cmd->se_lun->lun_sep_lock);
1483 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1486 * Used by fabric module frontends to queue tasks directly.
1487 * Many only be used from process context only
1489 int transport_handle_cdb_direct(
1496 pr_err("cmd->se_lun is NULL\n");
1499 if (in_interrupt()) {
1501 pr_err("transport_generic_handle_cdb cannot be called"
1502 " from interrupt context\n");
1506 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1507 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1508 * in existing usage to ensure that outstanding descriptors are handled
1509 * correctly during shutdown via transport_wait_for_tasks()
1511 * Also, we don't take cmd->t_state_lock here as we only expect
1512 * this to be called for initial descriptor submission.
1514 cmd->t_state = TRANSPORT_NEW_CMD;
1515 cmd->transport_state |= CMD_T_ACTIVE;
1518 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1519 * so follow TRANSPORT_NEW_CMD processing thread context usage
1520 * and call transport_generic_request_failure() if necessary..
1522 ret = transport_generic_new_cmd(cmd);
1524 transport_generic_request_failure(cmd);
1528 EXPORT_SYMBOL(transport_handle_cdb_direct);
1531 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1533 * @se_cmd: command descriptor to submit
1534 * @se_sess: associated se_sess for endpoint
1535 * @cdb: pointer to SCSI CDB
1536 * @sense: pointer to SCSI sense buffer
1537 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1538 * @data_length: fabric expected data transfer length
1539 * @task_addr: SAM task attribute
1540 * @data_dir: DMA data direction
1541 * @flags: flags for command submission from target_sc_flags_tables
1543 * This may only be called from process context, and also currently
1544 * assumes internal allocation of fabric payload buffer by target-core.
1546 void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1547 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1548 u32 data_length, int task_attr, int data_dir, int flags)
1550 struct se_portal_group *se_tpg;
1553 se_tpg = se_sess->se_tpg;
1555 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1556 BUG_ON(in_interrupt());
1558 * Initialize se_cmd for target operation. From this point
1559 * exceptions are handled by sending exception status via
1560 * target_core_fabric_ops->queue_status() callback
1562 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1563 data_length, data_dir, task_attr, sense);
1564 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1565 se_cmd->unknown_data_length = 1;
1567 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1568 * se_sess->sess_cmd_list. A second kref_get here is necessary
1569 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1570 * kref_put() to happen during fabric packet acknowledgement.
1572 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1574 * Signal bidirectional data payloads to target-core
1576 if (flags & TARGET_SCF_BIDI_OP)
1577 se_cmd->se_cmd_flags |= SCF_BIDI;
1579 * Locate se_lun pointer and attach it to struct se_cmd
1581 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1582 transport_send_check_condition_and_sense(se_cmd,
1583 se_cmd->scsi_sense_reason, 0);
1584 target_put_sess_cmd(se_sess, se_cmd);
1588 * Sanitize CDBs via transport_generic_cmd_sequencer() and
1589 * allocate the necessary tasks to complete the received CDB+data
1591 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1593 transport_generic_request_failure(se_cmd);
1598 * Check if we need to delay processing because of ALUA
1599 * Active/NonOptimized primary access state..
1601 core_alua_check_nonop_delay(se_cmd);
1604 * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1605 * for immediate execution of READs, otherwise wait for
1606 * transport_generic_handle_data() to be called for WRITEs
1607 * when fabric has filled the incoming buffer.
1609 transport_handle_cdb_direct(se_cmd);
1612 EXPORT_SYMBOL(target_submit_cmd);
1614 static void target_complete_tmr_failure(struct work_struct *work)
1616 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1618 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1619 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1620 transport_generic_free_cmd(se_cmd, 0);
1624 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1627 * @se_cmd: command descriptor to submit
1628 * @se_sess: associated se_sess for endpoint
1629 * @sense: pointer to SCSI sense buffer
1630 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1631 * @fabric_context: fabric context for TMR req
1632 * @tm_type: Type of TM request
1633 * @gfp: gfp type for caller
1634 * @tag: referenced task tag for TMR_ABORT_TASK
1635 * @flags: submit cmd flags
1637 * Callable from all contexts.
1640 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1641 unsigned char *sense, u32 unpacked_lun,
1642 void *fabric_tmr_ptr, unsigned char tm_type,
1643 gfp_t gfp, unsigned int tag, int flags)
1645 struct se_portal_group *se_tpg;
1648 se_tpg = se_sess->se_tpg;
1651 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1652 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1654 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1655 * allocation failure.
1657 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1661 if (tm_type == TMR_ABORT_TASK)
1662 se_cmd->se_tmr_req->ref_task_tag = tag;
1664 /* See target_submit_cmd for commentary */
1665 target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1667 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1670 * For callback during failure handling, push this work off
1671 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1673 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1674 schedule_work(&se_cmd->work);
1677 transport_generic_handle_tmr(se_cmd);
1680 EXPORT_SYMBOL(target_submit_tmr);
1683 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1684 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1685 * complete setup in TCM process context w/ TFO->new_cmd_map().
1687 int transport_generic_handle_cdb_map(
1692 pr_err("cmd->se_lun is NULL\n");
1696 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1699 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1701 /* transport_generic_handle_data():
1705 int transport_generic_handle_data(
1709 * For the software fabric case, then we assume the nexus is being
1710 * failed/shutdown when signals are pending from the kthread context
1711 * caller, so we return a failure. For the HW target mode case running
1712 * in interrupt code, the signal_pending() check is skipped.
1714 if (!in_interrupt() && signal_pending(current))
1717 * If the received CDB has aleady been ABORTED by the generic
1718 * target engine, we now call transport_check_aborted_status()
1719 * to queue any delated TASK_ABORTED status for the received CDB to the
1720 * fabric module as we are expecting no further incoming DATA OUT
1721 * sequences at this point.
1723 if (transport_check_aborted_status(cmd, 1) != 0)
1726 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1729 EXPORT_SYMBOL(transport_generic_handle_data);
1731 /* transport_generic_handle_tmr():
1735 int transport_generic_handle_tmr(
1738 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1741 EXPORT_SYMBOL(transport_generic_handle_tmr);
1744 * If the cmd is active, request it to be stopped and sleep until it
1747 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1749 bool was_active = false;
1751 if (cmd->transport_state & CMD_T_BUSY) {
1752 cmd->transport_state |= CMD_T_REQUEST_STOP;
1753 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1755 pr_debug("cmd %p waiting to complete\n", cmd);
1756 wait_for_completion(&cmd->task_stop_comp);
1757 pr_debug("cmd %p stopped successfully\n", cmd);
1759 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1760 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1761 cmd->transport_state &= ~CMD_T_BUSY;
1769 * Handle SAM-esque emulation for generic transport request failures.
1771 void transport_generic_request_failure(struct se_cmd *cmd)
1775 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1776 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1777 cmd->t_task_cdb[0]);
1778 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1779 cmd->se_tfo->get_cmd_state(cmd),
1780 cmd->t_state, cmd->scsi_sense_reason);
1781 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1782 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1783 (cmd->transport_state & CMD_T_STOP) != 0,
1784 (cmd->transport_state & CMD_T_SENT) != 0);
1787 * For SAM Task Attribute emulation for failed struct se_cmd
1789 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1790 transport_complete_task_attr(cmd);
1792 switch (cmd->scsi_sense_reason) {
1793 case TCM_NON_EXISTENT_LUN:
1794 case TCM_UNSUPPORTED_SCSI_OPCODE:
1795 case TCM_INVALID_CDB_FIELD:
1796 case TCM_INVALID_PARAMETER_LIST:
1797 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1798 case TCM_UNKNOWN_MODE_PAGE:
1799 case TCM_WRITE_PROTECTED:
1800 case TCM_CHECK_CONDITION_ABORT_CMD:
1801 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1802 case TCM_CHECK_CONDITION_NOT_READY:
1804 case TCM_RESERVATION_CONFLICT:
1806 * No SENSE Data payload for this case, set SCSI Status
1807 * and queue the response to $FABRIC_MOD.
1809 * Uses linux/include/scsi/scsi.h SAM status codes defs
1811 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1813 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1814 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1817 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1820 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1821 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1822 cmd->orig_fe_lun, 0x2C,
1823 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1825 ret = cmd->se_tfo->queue_status(cmd);
1826 if (ret == -EAGAIN || ret == -ENOMEM)
1830 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1831 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1832 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1836 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1837 * make the call to transport_send_check_condition_and_sense()
1838 * directly. Otherwise expect the fabric to make the call to
1839 * transport_send_check_condition_and_sense() after handling
1840 * possible unsoliticied write data payloads.
1842 ret = transport_send_check_condition_and_sense(cmd,
1843 cmd->scsi_sense_reason, 0);
1844 if (ret == -EAGAIN || ret == -ENOMEM)
1848 transport_lun_remove_cmd(cmd);
1849 if (!transport_cmd_check_stop_to_fabric(cmd))
1854 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1855 transport_handle_queue_full(cmd, cmd->se_dev);
1857 EXPORT_SYMBOL(transport_generic_request_failure);
1859 static inline u32 transport_lba_21(unsigned char *cdb)
1861 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1864 static inline u32 transport_lba_32(unsigned char *cdb)
1866 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1869 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1871 unsigned int __v1, __v2;
1873 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1874 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1876 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1880 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1882 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1884 unsigned int __v1, __v2;
1886 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1887 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1889 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1892 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1894 unsigned long flags;
1896 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1897 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1898 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1902 * Called from Fabric Module context from transport_execute_tasks()
1904 * The return of this function determins if the tasks from struct se_cmd
1905 * get added to the execution queue in transport_execute_tasks(),
1906 * or are added to the delayed or ordered lists here.
1908 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1910 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1913 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1914 * to allow the passed struct se_cmd list of tasks to the front of the list.
1916 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1917 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1918 " 0x%02x, se_ordered_id: %u\n",
1920 cmd->se_ordered_id);
1922 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1923 atomic_inc(&cmd->se_dev->dev_ordered_sync);
1924 smp_mb__after_atomic_inc();
1926 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1927 " list, se_ordered_id: %u\n",
1929 cmd->se_ordered_id);
1931 * Add ORDERED command to tail of execution queue if
1932 * no other older commands exist that need to be
1935 if (!atomic_read(&cmd->se_dev->simple_cmds))
1939 * For SIMPLE and UNTAGGED Task Attribute commands
1941 atomic_inc(&cmd->se_dev->simple_cmds);
1942 smp_mb__after_atomic_inc();
1945 * Otherwise if one or more outstanding ORDERED task attribute exist,
1946 * add the dormant task(s) built for the passed struct se_cmd to the
1947 * execution queue and become in Active state for this struct se_device.
1949 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
1951 * Otherwise, add cmd w/ tasks to delayed cmd queue that
1952 * will be drained upon completion of HEAD_OF_QUEUE task.
1954 spin_lock(&cmd->se_dev->delayed_cmd_lock);
1955 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
1956 list_add_tail(&cmd->se_delayed_node,
1957 &cmd->se_dev->delayed_cmd_list);
1958 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
1960 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1961 " delayed CMD list, se_ordered_id: %u\n",
1962 cmd->t_task_cdb[0], cmd->sam_task_attr,
1963 cmd->se_ordered_id);
1965 * Return zero to let transport_execute_tasks() know
1966 * not to add the delayed tasks to the execution list.
1971 * Otherwise, no ORDERED task attributes exist..
1977 * Called from fabric module context in transport_generic_new_cmd() and
1978 * transport_generic_process_write()
1980 static void transport_execute_tasks(struct se_cmd *cmd)
1983 struct se_device *se_dev = cmd->se_dev;
1985 * Call transport_cmd_check_stop() to see if a fabric exception
1986 * has occurred that prevents execution.
1988 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
1990 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
1991 * attribute for the tasks of the received struct se_cmd CDB
1993 add_tasks = transport_execute_task_attr(cmd);
1995 __transport_execute_tasks(se_dev, cmd);
1999 __transport_execute_tasks(se_dev, NULL);
2002 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
2005 struct se_cmd *cmd = NULL;
2006 unsigned long flags;
2009 spin_lock_irq(&dev->execute_task_lock);
2010 if (new_cmd != NULL)
2011 __target_add_to_execute_list(new_cmd);
2013 if (list_empty(&dev->execute_list)) {
2014 spin_unlock_irq(&dev->execute_task_lock);
2017 cmd = list_first_entry(&dev->execute_list, struct se_cmd, execute_list);
2018 __target_remove_from_execute_list(cmd);
2019 spin_unlock_irq(&dev->execute_task_lock);
2021 spin_lock_irqsave(&cmd->t_state_lock, flags);
2022 cmd->transport_state |= CMD_T_BUSY;
2023 cmd->transport_state |= CMD_T_SENT;
2025 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2027 if (cmd->execute_cmd)
2028 error = cmd->execute_cmd(cmd);
2030 error = dev->transport->execute_cmd(cmd, cmd->t_data_sg,
2031 cmd->t_data_nents, cmd->data_direction);
2035 spin_lock_irqsave(&cmd->t_state_lock, flags);
2036 cmd->transport_state &= ~CMD_T_BUSY;
2037 cmd->transport_state &= ~CMD_T_SENT;
2038 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2040 transport_generic_request_failure(cmd);
2049 static inline u32 transport_get_sectors_6(
2054 struct se_device *dev = cmd->se_dev;
2057 * Assume TYPE_DISK for non struct se_device objects.
2058 * Use 8-bit sector value.
2064 * Use 24-bit allocation length for TYPE_TAPE.
2066 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2067 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2070 * Everything else assume TYPE_DISK Sector CDB location.
2071 * Use 8-bit sector value. SBC-3 says:
2073 * A TRANSFER LENGTH field set to zero specifies that 256
2074 * logical blocks shall be written. Any other value
2075 * specifies the number of logical blocks that shall be
2079 return cdb[4] ? : 256;
2082 static inline u32 transport_get_sectors_10(
2087 struct se_device *dev = cmd->se_dev;
2090 * Assume TYPE_DISK for non struct se_device objects.
2091 * Use 16-bit sector value.
2097 * XXX_10 is not defined in SSC, throw an exception
2099 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2105 * Everything else assume TYPE_DISK Sector CDB location.
2106 * Use 16-bit sector value.
2109 return (u32)(cdb[7] << 8) + cdb[8];
2112 static inline u32 transport_get_sectors_12(
2117 struct se_device *dev = cmd->se_dev;
2120 * Assume TYPE_DISK for non struct se_device objects.
2121 * Use 32-bit sector value.
2127 * XXX_12 is not defined in SSC, throw an exception
2129 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2135 * Everything else assume TYPE_DISK Sector CDB location.
2136 * Use 32-bit sector value.
2139 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2142 static inline u32 transport_get_sectors_16(
2147 struct se_device *dev = cmd->se_dev;
2150 * Assume TYPE_DISK for non struct se_device objects.
2151 * Use 32-bit sector value.
2157 * Use 24-bit allocation length for TYPE_TAPE.
2159 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2160 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2163 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2164 (cdb[12] << 8) + cdb[13];
2168 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2170 static inline u32 transport_get_sectors_32(
2176 * Assume TYPE_DISK for non struct se_device objects.
2177 * Use 32-bit sector value.
2179 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2180 (cdb[30] << 8) + cdb[31];
2184 static inline u32 transport_get_size(
2189 struct se_device *dev = cmd->se_dev;
2191 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2192 if (cdb[1] & 1) { /* sectors */
2193 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2198 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2199 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
2200 sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2201 dev->transport->name);
2203 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2206 static void transport_xor_callback(struct se_cmd *cmd)
2208 unsigned char *buf, *addr;
2209 struct scatterlist *sg;
2210 unsigned int offset;
2214 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2216 * 1) read the specified logical block(s);
2217 * 2) transfer logical blocks from the data-out buffer;
2218 * 3) XOR the logical blocks transferred from the data-out buffer with
2219 * the logical blocks read, storing the resulting XOR data in a buffer;
2220 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2221 * blocks transferred from the data-out buffer; and
2222 * 5) transfer the resulting XOR data to the data-in buffer.
2224 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2226 pr_err("Unable to allocate xor_callback buf\n");
2230 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2231 * into the locally allocated *buf
2233 sg_copy_to_buffer(cmd->t_data_sg,
2239 * Now perform the XOR against the BIDI read memory located at
2240 * cmd->t_mem_bidi_list
2244 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2245 addr = kmap_atomic(sg_page(sg));
2249 for (i = 0; i < sg->length; i++)
2250 *(addr + sg->offset + i) ^= *(buf + offset + i);
2252 offset += sg->length;
2253 kunmap_atomic(addr);
2261 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2263 static int transport_get_sense_data(struct se_cmd *cmd)
2265 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2266 struct se_device *dev = cmd->se_dev;
2267 unsigned long flags;
2270 WARN_ON(!cmd->se_lun);
2275 spin_lock_irqsave(&cmd->t_state_lock, flags);
2276 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2277 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2281 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2284 if (!dev->transport->get_sense_buffer) {
2285 pr_err("dev->transport->get_sense_buffer is NULL\n");
2289 sense_buffer = dev->transport->get_sense_buffer(cmd);
2290 if (!sense_buffer) {
2291 pr_err("ITT 0x%08x cmd %p: Unable to locate"
2292 " sense buffer for task with sense\n",
2293 cmd->se_tfo->get_task_tag(cmd), cmd);
2297 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2299 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
2301 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
2303 /* Automatically padded */
2304 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
2306 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2307 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
2311 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2315 static inline long long transport_dev_end_lba(struct se_device *dev)
2317 return dev->transport->get_blocks(dev) + 1;
2320 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2322 struct se_device *dev = cmd->se_dev;
2325 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2328 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2330 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2331 pr_err("LBA: %llu Sectors: %u exceeds"
2332 " transport_dev_end_lba(): %llu\n",
2333 cmd->t_task_lba, sectors,
2334 transport_dev_end_lba(dev));
2341 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2344 * Determine if the received WRITE_SAME is used to for direct
2345 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2346 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2347 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2349 int passthrough = (dev->transport->transport_type ==
2350 TRANSPORT_PLUGIN_PHBA_PDEV);
2353 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2354 pr_err("WRITE_SAME PBDATA and LBDATA"
2355 " bits not supported for Block Discard"
2360 * Currently for the emulated case we only accept
2361 * tpws with the UNMAP=1 bit set.
2363 if (!(flags[0] & 0x08)) {
2364 pr_err("WRITE_SAME w/o UNMAP bit not"
2365 " supported for Block Discard Emulation\n");
2373 /* transport_generic_cmd_sequencer():
2375 * Generic Command Sequencer that should work for most DAS transport
2378 * Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
2381 * FIXME: Need to support other SCSI OPCODES where as well.
2383 static int transport_generic_cmd_sequencer(
2387 struct se_device *dev = cmd->se_dev;
2388 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2389 int ret = 0, sector_ret = 0, passthrough;
2390 u32 sectors = 0, size = 0, pr_reg_type = 0;
2394 * Check for an existing UNIT ATTENTION condition
2396 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2397 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2398 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2402 * Check status of Asymmetric Logical Unit Assignment port
2404 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2407 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2408 * The ALUA additional sense code qualifier (ASCQ) is determined
2409 * by the ALUA primary or secondary access state..
2412 pr_debug("[%s]: ALUA TG Port not available,"
2413 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2414 cmd->se_tfo->get_fabric_name(), alua_ascq);
2416 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2417 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2418 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2421 goto out_invalid_cdb_field;
2424 * Check status for SPC-3 Persistent Reservations
2426 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2427 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2428 cmd, cdb, pr_reg_type) != 0) {
2429 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2430 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2431 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2432 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2436 * This means the CDB is allowed for the SCSI Initiator port
2437 * when said port is *NOT* holding the legacy SPC-2 or
2438 * SPC-3 Persistent Reservation.
2443 * If we operate in passthrough mode we skip most CDB emulation and
2444 * instead hand the commands down to the physical SCSI device.
2447 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2451 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2453 goto out_unsupported_cdb;
2454 size = transport_get_size(sectors, cdb, cmd);
2455 cmd->t_task_lba = transport_lba_21(cdb);
2456 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2459 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2461 goto out_unsupported_cdb;
2462 size = transport_get_size(sectors, cdb, cmd);
2463 cmd->t_task_lba = transport_lba_32(cdb);
2464 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2467 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2469 goto out_unsupported_cdb;
2470 size = transport_get_size(sectors, cdb, cmd);
2471 cmd->t_task_lba = transport_lba_32(cdb);
2472 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2475 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2477 goto out_unsupported_cdb;
2478 size = transport_get_size(sectors, cdb, cmd);
2479 cmd->t_task_lba = transport_lba_64(cdb);
2480 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2483 sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
2485 goto out_unsupported_cdb;
2486 size = transport_get_size(sectors, cdb, cmd);
2487 cmd->t_task_lba = transport_lba_21(cdb);
2488 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2492 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2494 goto out_unsupported_cdb;
2495 size = transport_get_size(sectors, cdb, cmd);
2496 cmd->t_task_lba = transport_lba_32(cdb);
2498 cmd->se_cmd_flags |= SCF_FUA;
2499 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2502 sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
2504 goto out_unsupported_cdb;
2505 size = transport_get_size(sectors, cdb, cmd);
2506 cmd->t_task_lba = transport_lba_32(cdb);
2508 cmd->se_cmd_flags |= SCF_FUA;
2509 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2512 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2514 goto out_unsupported_cdb;
2515 size = transport_get_size(sectors, cdb, cmd);
2516 cmd->t_task_lba = transport_lba_64(cdb);
2518 cmd->se_cmd_flags |= SCF_FUA;
2519 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2521 case XDWRITEREAD_10:
2522 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2523 !(cmd->se_cmd_flags & SCF_BIDI))
2524 goto out_invalid_cdb_field;
2525 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2527 goto out_unsupported_cdb;
2528 size = transport_get_size(sectors, cdb, cmd);
2529 cmd->t_task_lba = transport_lba_32(cdb);
2530 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2533 * Do now allow BIDI commands for passthrough mode.
2536 goto out_unsupported_cdb;
2539 * Setup BIDI XOR callback to be run after I/O completion.
2541 cmd->transport_complete_callback = &transport_xor_callback;
2543 cmd->se_cmd_flags |= SCF_FUA;
2545 case VARIABLE_LENGTH_CMD:
2546 service_action = get_unaligned_be16(&cdb[8]);
2547 switch (service_action) {
2548 case XDWRITEREAD_32:
2549 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2551 goto out_unsupported_cdb;
2552 size = transport_get_size(sectors, cdb, cmd);
2554 * Use WRITE_32 and READ_32 opcodes for the emulated
2555 * XDWRITE_READ_32 logic.
2557 cmd->t_task_lba = transport_lba_64_ext(cdb);
2558 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2561 * Do now allow BIDI commands for passthrough mode.
2564 goto out_unsupported_cdb;
2567 * Setup BIDI XOR callback to be run during after I/O
2570 cmd->transport_complete_callback = &transport_xor_callback;
2572 cmd->se_cmd_flags |= SCF_FUA;
2575 sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
2577 goto out_unsupported_cdb;
2580 size = transport_get_size(1, cdb, cmd);
2582 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2584 goto out_invalid_cdb_field;
2587 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2588 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2590 if (target_check_write_same_discard(&cdb[10], dev) < 0)
2591 goto out_unsupported_cdb;
2593 cmd->execute_cmd = target_emulate_write_same;
2596 pr_err("VARIABLE_LENGTH_CMD service action"
2597 " 0x%04x not supported\n", service_action);
2598 goto out_unsupported_cdb;
2601 case MAINTENANCE_IN:
2602 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2603 /* MAINTENANCE_IN from SCC-2 */
2605 * Check for emulated MI_REPORT_TARGET_PGS.
2607 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS &&
2608 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2610 target_emulate_report_target_port_groups;
2612 size = (cdb[6] << 24) | (cdb[7] << 16) |
2613 (cdb[8] << 8) | cdb[9];
2615 /* GPCMD_SEND_KEY from multi media commands */
2616 size = (cdb[8] << 8) + cdb[9];
2618 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2622 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2624 case MODE_SELECT_10:
2625 size = (cdb[7] << 8) + cdb[8];
2626 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2630 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2632 cmd->execute_cmd = target_emulate_modesense;
2635 size = (cdb[7] << 8) + cdb[8];
2636 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2638 cmd->execute_cmd = target_emulate_modesense;
2640 case GPCMD_READ_BUFFER_CAPACITY:
2641 case GPCMD_SEND_OPC:
2644 size = (cdb[7] << 8) + cdb[8];
2645 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2647 case READ_BLOCK_LIMITS:
2648 size = READ_BLOCK_LEN;
2649 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2651 case GPCMD_GET_CONFIGURATION:
2652 case GPCMD_READ_FORMAT_CAPACITIES:
2653 case GPCMD_READ_DISC_INFO:
2654 case GPCMD_READ_TRACK_RZONE_INFO:
2655 size = (cdb[7] << 8) + cdb[8];
2656 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2658 case PERSISTENT_RESERVE_IN:
2659 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2660 cmd->execute_cmd = target_scsi3_emulate_pr_in;
2661 size = (cdb[7] << 8) + cdb[8];
2662 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2664 case PERSISTENT_RESERVE_OUT:
2665 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2666 cmd->execute_cmd = target_scsi3_emulate_pr_out;
2667 size = (cdb[7] << 8) + cdb[8];
2668 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2670 case GPCMD_MECHANISM_STATUS:
2671 case GPCMD_READ_DVD_STRUCTURE:
2672 size = (cdb[8] << 8) + cdb[9];
2673 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2676 size = READ_POSITION_LEN;
2677 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2679 case MAINTENANCE_OUT:
2680 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2681 /* MAINTENANCE_OUT from SCC-2
2683 * Check for emulated MO_SET_TARGET_PGS.
2685 if (cdb[1] == MO_SET_TARGET_PGS &&
2686 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2688 target_emulate_set_target_port_groups;
2691 size = (cdb[6] << 24) | (cdb[7] << 16) |
2692 (cdb[8] << 8) | cdb[9];
2694 /* GPCMD_REPORT_KEY from multi media commands */
2695 size = (cdb[8] << 8) + cdb[9];
2697 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2700 size = (cdb[3] << 8) + cdb[4];
2702 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2703 * See spc4r17 section 5.3
2705 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2706 cmd->sam_task_attr = MSG_HEAD_TAG;
2707 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2709 cmd->execute_cmd = target_emulate_inquiry;
2712 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2713 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2716 size = READ_CAP_LEN;
2717 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2719 cmd->execute_cmd = target_emulate_readcapacity;
2721 case READ_MEDIA_SERIAL_NUMBER:
2722 case SECURITY_PROTOCOL_IN:
2723 case SECURITY_PROTOCOL_OUT:
2724 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2725 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2727 case SERVICE_ACTION_IN:
2728 switch (cmd->t_task_cdb[1] & 0x1f) {
2729 case SAI_READ_CAPACITY_16:
2732 target_emulate_readcapacity_16;
2738 pr_err("Unsupported SA: 0x%02x\n",
2739 cmd->t_task_cdb[1] & 0x1f);
2740 goto out_invalid_cdb_field;
2743 case ACCESS_CONTROL_IN:
2744 case ACCESS_CONTROL_OUT:
2746 case READ_ATTRIBUTE:
2747 case RECEIVE_COPY_RESULTS:
2748 case WRITE_ATTRIBUTE:
2749 size = (cdb[10] << 24) | (cdb[11] << 16) |
2750 (cdb[12] << 8) | cdb[13];
2751 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2753 case RECEIVE_DIAGNOSTIC:
2754 case SEND_DIAGNOSTIC:
2755 size = (cdb[3] << 8) | cdb[4];
2756 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2758 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2761 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2762 size = (2336 * sectors);
2763 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2768 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2772 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2774 cmd->execute_cmd = target_emulate_request_sense;
2776 case READ_ELEMENT_STATUS:
2777 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2778 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2781 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2782 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2787 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2788 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2790 if (cdb[0] == RESERVE_10)
2791 size = (cdb[7] << 8) | cdb[8];
2793 size = cmd->data_length;
2796 * Setup the legacy emulated handler for SPC-2 and
2797 * >= SPC-3 compatible reservation handling (CRH=1)
2798 * Otherwise, we assume the underlying SCSI logic is
2799 * is running in SPC_PASSTHROUGH, and wants reservations
2800 * emulation disabled.
2802 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2803 cmd->execute_cmd = target_scsi2_reservation_reserve;
2804 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2809 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2810 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2812 if (cdb[0] == RELEASE_10)
2813 size = (cdb[7] << 8) | cdb[8];
2815 size = cmd->data_length;
2817 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2818 cmd->execute_cmd = target_scsi2_reservation_release;
2819 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2821 case SYNCHRONIZE_CACHE:
2822 case SYNCHRONIZE_CACHE_16:
2824 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2826 if (cdb[0] == SYNCHRONIZE_CACHE) {
2827 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2828 cmd->t_task_lba = transport_lba_32(cdb);
2830 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2831 cmd->t_task_lba = transport_lba_64(cdb);
2834 goto out_unsupported_cdb;
2836 size = transport_get_size(sectors, cdb, cmd);
2837 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2843 * Check to ensure that LBA + Range does not exceed past end of
2844 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2846 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2847 if (transport_cmd_get_valid_sectors(cmd) < 0)
2848 goto out_invalid_cdb_field;
2850 cmd->execute_cmd = target_emulate_synchronize_cache;
2853 size = get_unaligned_be16(&cdb[7]);
2854 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2856 cmd->execute_cmd = target_emulate_unmap;
2859 sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
2861 goto out_unsupported_cdb;
2864 size = transport_get_size(1, cdb, cmd);
2866 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2867 goto out_invalid_cdb_field;
2870 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
2871 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2873 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2874 goto out_unsupported_cdb;
2876 cmd->execute_cmd = target_emulate_write_same;
2879 sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
2881 goto out_unsupported_cdb;
2884 size = transport_get_size(1, cdb, cmd);
2886 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2887 goto out_invalid_cdb_field;
2890 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
2891 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2893 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2894 * of byte 1 bit 3 UNMAP instead of original reserved field
2896 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2897 goto out_unsupported_cdb;
2899 cmd->execute_cmd = target_emulate_write_same;
2901 case ALLOW_MEDIUM_REMOVAL:
2907 case TEST_UNIT_READY:
2909 case WRITE_FILEMARKS:
2910 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2912 cmd->execute_cmd = target_emulate_noop;
2914 case GPCMD_CLOSE_TRACK:
2915 case INITIALIZE_ELEMENT_STATUS:
2916 case GPCMD_LOAD_UNLOAD:
2917 case GPCMD_SET_SPEED:
2919 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2922 cmd->execute_cmd = target_report_luns;
2923 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2925 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2926 * See spc4r17 section 5.3
2928 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2929 cmd->sam_task_attr = MSG_HEAD_TAG;
2930 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2932 case GET_EVENT_STATUS_NOTIFICATION:
2933 size = (cdb[7] << 8) | cdb[8];
2934 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2937 /* Only support ATA passthrough to pSCSI backends.. */
2939 goto out_unsupported_cdb;
2942 switch (cdb[2] & 0x3) {
2947 sectors = (((cdb[1] & 0x1) ? cdb[3] : 0) << 8) | cdb[4];
2950 sectors = (((cdb[1] & 0x1) ? cdb[5] : 0) << 8) | cdb[6];
2953 pr_err("T_LENGTH=0x3 not supported for ATA_16\n");
2954 goto out_invalid_cdb_field;
2959 /* BLOCK T_TYPE: 512 or sector */
2960 size = sectors * ((cdb[2] & 0x10) ?
2961 dev->se_sub_dev->se_dev_attrib.block_size : 512);
2966 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2969 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
2970 " 0x%02x, sending CHECK_CONDITION.\n",
2971 cmd->se_tfo->get_fabric_name(), cdb[0]);
2972 goto out_unsupported_cdb;
2975 if (cmd->unknown_data_length)
2976 cmd->data_length = size;
2978 if (size != cmd->data_length) {
2979 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
2980 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
2981 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
2982 cmd->data_length, size, cdb[0]);
2984 cmd->cmd_spdtl = size;
2986 if (cmd->data_direction == DMA_TO_DEVICE) {
2987 pr_err("Rejecting underflow/overflow"
2989 goto out_invalid_cdb_field;
2992 * Reject READ_* or WRITE_* with overflow/underflow for
2993 * type SCF_SCSI_DATA_SG_IO_CDB.
2995 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
2996 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
2997 " CDB on non 512-byte sector setup subsystem"
2998 " plugin: %s\n", dev->transport->name);
2999 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3000 goto out_invalid_cdb_field;
3003 if (size > cmd->data_length) {
3004 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3005 cmd->residual_count = (size - cmd->data_length);
3007 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3008 cmd->residual_count = (cmd->data_length - size);
3010 cmd->data_length = size;
3013 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3014 if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
3015 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
3016 " big sectors %u exceeds fabric_max_sectors:"
3017 " %u\n", cdb[0], sectors,
3018 su_dev->se_dev_attrib.fabric_max_sectors);
3019 goto out_invalid_cdb_field;
3021 if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
3022 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
3023 " big sectors %u exceeds backend hw_max_sectors:"
3024 " %u\n", cdb[0], sectors,
3025 su_dev->se_dev_attrib.hw_max_sectors);
3026 goto out_invalid_cdb_field;
3030 /* reject any command that we don't have a handler for */
3031 if (!(passthrough || cmd->execute_cmd ||
3032 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3033 goto out_unsupported_cdb;
3035 transport_set_supported_SAM_opcode(cmd);
3038 out_unsupported_cdb:
3039 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3040 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3042 out_invalid_cdb_field:
3043 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3044 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3049 * Called from I/O completion to determine which dormant/delayed
3050 * and ordered cmds need to have their tasks added to the execution queue.
3052 static void transport_complete_task_attr(struct se_cmd *cmd)
3054 struct se_device *dev = cmd->se_dev;
3055 struct se_cmd *cmd_p, *cmd_tmp;
3056 int new_active_tasks = 0;
3058 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3059 atomic_dec(&dev->simple_cmds);
3060 smp_mb__after_atomic_dec();
3061 dev->dev_cur_ordered_id++;
3062 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3063 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3064 cmd->se_ordered_id);
3065 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3066 dev->dev_cur_ordered_id++;
3067 pr_debug("Incremented dev_cur_ordered_id: %u for"
3068 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3069 cmd->se_ordered_id);
3070 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3071 atomic_dec(&dev->dev_ordered_sync);
3072 smp_mb__after_atomic_dec();
3074 dev->dev_cur_ordered_id++;
3075 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3076 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3079 * Process all commands up to the last received
3080 * ORDERED task attribute which requires another blocking
3083 spin_lock(&dev->delayed_cmd_lock);
3084 list_for_each_entry_safe(cmd_p, cmd_tmp,
3085 &dev->delayed_cmd_list, se_delayed_node) {
3087 list_del(&cmd_p->se_delayed_node);
3088 spin_unlock(&dev->delayed_cmd_lock);
3090 pr_debug("Calling add_tasks() for"
3091 " cmd_p: 0x%02x Task Attr: 0x%02x"
3092 " Dormant -> Active, se_ordered_id: %u\n",
3093 cmd_p->t_task_cdb[0],
3094 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3096 target_add_to_execute_list(cmd_p);
3099 spin_lock(&dev->delayed_cmd_lock);
3100 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3103 spin_unlock(&dev->delayed_cmd_lock);
3105 * If new tasks have become active, wake up the transport thread
3106 * to do the processing of the Active tasks.
3108 if (new_active_tasks != 0)
3109 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3112 static void transport_complete_qf(struct se_cmd *cmd)
3116 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3117 transport_complete_task_attr(cmd);
3119 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3120 ret = cmd->se_tfo->queue_status(cmd);
3125 switch (cmd->data_direction) {
3126 case DMA_FROM_DEVICE:
3127 ret = cmd->se_tfo->queue_data_in(cmd);
3130 if (cmd->t_bidi_data_sg) {
3131 ret = cmd->se_tfo->queue_data_in(cmd);
3135 /* Fall through for DMA_TO_DEVICE */
3137 ret = cmd->se_tfo->queue_status(cmd);
3145 transport_handle_queue_full(cmd, cmd->se_dev);
3148 transport_lun_remove_cmd(cmd);
3149 transport_cmd_check_stop_to_fabric(cmd);
3152 static void transport_handle_queue_full(
3154 struct se_device *dev)
3156 spin_lock_irq(&dev->qf_cmd_lock);
3157 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3158 atomic_inc(&dev->dev_qf_count);
3159 smp_mb__after_atomic_inc();
3160 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3162 schedule_work(&cmd->se_dev->qf_work_queue);
3165 static void target_complete_ok_work(struct work_struct *work)
3167 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3168 int reason = 0, ret;
3171 * Check if we need to move delayed/dormant tasks from cmds on the
3172 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3175 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3176 transport_complete_task_attr(cmd);
3178 * Check to schedule QUEUE_FULL work, or execute an existing
3179 * cmd->transport_qf_callback()
3181 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3182 schedule_work(&cmd->se_dev->qf_work_queue);
3185 * Check if we need to retrieve a sense buffer from
3186 * the struct se_cmd in question.
3188 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3189 if (transport_get_sense_data(cmd) < 0)
3190 reason = TCM_NON_EXISTENT_LUN;
3192 if (cmd->scsi_status) {
3193 ret = transport_send_check_condition_and_sense(
3195 if (ret == -EAGAIN || ret == -ENOMEM)
3198 transport_lun_remove_cmd(cmd);
3199 transport_cmd_check_stop_to_fabric(cmd);
3204 * Check for a callback, used by amongst other things
3205 * XDWRITE_READ_10 emulation.
3207 if (cmd->transport_complete_callback)
3208 cmd->transport_complete_callback(cmd);
3210 switch (cmd->data_direction) {
3211 case DMA_FROM_DEVICE:
3212 spin_lock(&cmd->se_lun->lun_sep_lock);
3213 if (cmd->se_lun->lun_sep) {
3214 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3217 spin_unlock(&cmd->se_lun->lun_sep_lock);
3219 ret = cmd->se_tfo->queue_data_in(cmd);
3220 if (ret == -EAGAIN || ret == -ENOMEM)
3224 spin_lock(&cmd->se_lun->lun_sep_lock);
3225 if (cmd->se_lun->lun_sep) {
3226 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3229 spin_unlock(&cmd->se_lun->lun_sep_lock);
3231 * Check if we need to send READ payload for BIDI-COMMAND
3233 if (cmd->t_bidi_data_sg) {
3234 spin_lock(&cmd->se_lun->lun_sep_lock);
3235 if (cmd->se_lun->lun_sep) {
3236 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3239 spin_unlock(&cmd->se_lun->lun_sep_lock);
3240 ret = cmd->se_tfo->queue_data_in(cmd);
3241 if (ret == -EAGAIN || ret == -ENOMEM)
3245 /* Fall through for DMA_TO_DEVICE */
3247 ret = cmd->se_tfo->queue_status(cmd);
3248 if (ret == -EAGAIN || ret == -ENOMEM)
3255 transport_lun_remove_cmd(cmd);
3256 transport_cmd_check_stop_to_fabric(cmd);
3260 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3261 " data_direction: %d\n", cmd, cmd->data_direction);
3262 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3263 transport_handle_queue_full(cmd, cmd->se_dev);
3266 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3268 struct scatterlist *sg;
3271 for_each_sg(sgl, sg, nents, count)
3272 __free_page(sg_page(sg));
3277 static inline void transport_free_pages(struct se_cmd *cmd)
3279 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3282 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3283 cmd->t_data_sg = NULL;
3284 cmd->t_data_nents = 0;
3286 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3287 cmd->t_bidi_data_sg = NULL;
3288 cmd->t_bidi_data_nents = 0;
3292 * transport_release_cmd - free a command
3293 * @cmd: command to free
3295 * This routine unconditionally frees a command, and reference counting
3296 * or list removal must be done in the caller.
3298 static void transport_release_cmd(struct se_cmd *cmd)
3300 BUG_ON(!cmd->se_tfo);
3302 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
3303 core_tmr_release_req(cmd->se_tmr_req);
3304 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3305 kfree(cmd->t_task_cdb);
3307 * If this cmd has been setup with target_get_sess_cmd(), drop
3308 * the kref and call ->release_cmd() in kref callback.
3310 if (cmd->check_release != 0) {
3311 target_put_sess_cmd(cmd->se_sess, cmd);
3314 cmd->se_tfo->release_cmd(cmd);
3318 * transport_put_cmd - release a reference to a command
3319 * @cmd: command to release
3321 * This routine releases our reference to the command and frees it if possible.
3323 static void transport_put_cmd(struct se_cmd *cmd)
3325 unsigned long flags;
3327 spin_lock_irqsave(&cmd->t_state_lock, flags);
3328 if (atomic_read(&cmd->t_fe_count)) {
3329 if (!atomic_dec_and_test(&cmd->t_fe_count))
3333 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3334 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3335 target_remove_from_state_list(cmd);
3337 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3339 transport_free_pages(cmd);
3340 transport_release_cmd(cmd);
3343 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3347 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3348 * allocating in the core.
3349 * @cmd: Associated se_cmd descriptor
3350 * @mem: SGL style memory for TCM WRITE / READ
3351 * @sg_mem_num: Number of SGL elements
3352 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3353 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3355 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3358 int transport_generic_map_mem_to_cmd(
3360 struct scatterlist *sgl,
3362 struct scatterlist *sgl_bidi,
3365 if (!sgl || !sgl_count)
3368 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3369 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3371 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3372 * scatterlists already have been set to follow what the fabric
3373 * passes for the original expected data transfer length.
3375 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3376 pr_warn("Rejecting SCSI DATA overflow for fabric using"
3377 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3378 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3379 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3383 cmd->t_data_sg = sgl;
3384 cmd->t_data_nents = sgl_count;
3386 if (sgl_bidi && sgl_bidi_count) {
3387 cmd->t_bidi_data_sg = sgl_bidi;
3388 cmd->t_bidi_data_nents = sgl_bidi_count;
3390 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3395 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3397 void *transport_kmap_data_sg(struct se_cmd *cmd)
3399 struct scatterlist *sg = cmd->t_data_sg;
3400 struct page **pages;
3405 * We need to take into account a possible offset here for fabrics like
3406 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3407 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3409 if (!cmd->t_data_nents)
3411 else if (cmd->t_data_nents == 1)
3412 return kmap(sg_page(sg)) + sg->offset;
3414 /* >1 page. use vmap */
3415 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3419 /* convert sg[] to pages[] */
3420 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3421 pages[i] = sg_page(sg);
3424 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
3426 if (!cmd->t_data_vmap)
3429 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
3431 EXPORT_SYMBOL(transport_kmap_data_sg);
3433 void transport_kunmap_data_sg(struct se_cmd *cmd)
3435 if (!cmd->t_data_nents) {
3437 } else if (cmd->t_data_nents == 1) {
3438 kunmap(sg_page(cmd->t_data_sg));
3442 vunmap(cmd->t_data_vmap);
3443 cmd->t_data_vmap = NULL;
3445 EXPORT_SYMBOL(transport_kunmap_data_sg);
3448 transport_generic_get_mem(struct se_cmd *cmd)
3450 u32 length = cmd->data_length;
3456 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3457 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3458 if (!cmd->t_data_sg)
3461 cmd->t_data_nents = nents;
3462 sg_init_table(cmd->t_data_sg, nents);
3464 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3467 u32 page_len = min_t(u32, length, PAGE_SIZE);
3468 page = alloc_page(GFP_KERNEL | zero_flag);
3472 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3480 __free_page(sg_page(&cmd->t_data_sg[i]));
3483 kfree(cmd->t_data_sg);
3484 cmd->t_data_sg = NULL;
3489 * Allocate any required resources to execute the command. For writes we
3490 * might not have the payload yet, so notify the fabric via a call to
3491 * ->write_pending instead. Otherwise place it on the execution queue.
3493 int transport_generic_new_cmd(struct se_cmd *cmd)
3495 struct se_device *dev = cmd->se_dev;
3499 * Determine is the TCM fabric module has already allocated physical
3500 * memory, and is directly calling transport_generic_map_mem_to_cmd()
3503 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3505 ret = transport_generic_get_mem(cmd);
3510 /* Workaround for handling zero-length control CDBs */
3511 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3512 !cmd->data_length) {
3513 spin_lock_irq(&cmd->t_state_lock);
3514 cmd->t_state = TRANSPORT_COMPLETE;
3515 cmd->transport_state |= CMD_T_ACTIVE;
3516 spin_unlock_irq(&cmd->t_state_lock);
3518 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3519 u8 ua_asc = 0, ua_ascq = 0;
3521 core_scsi3_ua_clear_for_request_sense(cmd,
3525 INIT_WORK(&cmd->work, target_complete_ok_work);
3526 queue_work(target_completion_wq, &cmd->work);
3530 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3531 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
3533 if (transport_cmd_get_valid_sectors(cmd) < 0)
3536 BUG_ON(cmd->data_length % attr->block_size);
3537 BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
3538 attr->hw_max_sectors);
3541 atomic_inc(&cmd->t_fe_count);
3544 * For WRITEs, let the fabric know its buffer is ready.
3546 * The command will be added to the execution queue after its write
3549 if (cmd->data_direction == DMA_TO_DEVICE) {
3550 target_add_to_state_list(cmd);
3551 return transport_generic_write_pending(cmd);
3554 * Everything else but a WRITE, add the command to the execution queue.
3556 transport_execute_tasks(cmd);
3560 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3561 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3564 EXPORT_SYMBOL(transport_generic_new_cmd);
3566 /* transport_generic_process_write():
3570 void transport_generic_process_write(struct se_cmd *cmd)
3572 transport_execute_tasks(cmd);
3574 EXPORT_SYMBOL(transport_generic_process_write);
3576 static void transport_write_pending_qf(struct se_cmd *cmd)
3580 ret = cmd->se_tfo->write_pending(cmd);
3581 if (ret == -EAGAIN || ret == -ENOMEM) {
3582 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3584 transport_handle_queue_full(cmd, cmd->se_dev);
3588 static int transport_generic_write_pending(struct se_cmd *cmd)
3590 unsigned long flags;
3593 spin_lock_irqsave(&cmd->t_state_lock, flags);
3594 cmd->t_state = TRANSPORT_WRITE_PENDING;
3595 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3598 * Clear the se_cmd for WRITE_PENDING status in order to set
3599 * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3600 * from HW target mode interrupt code. This is safe to be called
3601 * with transport_off=1 before the cmd->se_tfo->write_pending
3602 * because the se_cmd->se_lun pointer is not being cleared.
3604 transport_cmd_check_stop(cmd, 1, 0);
3607 * Call the fabric write_pending function here to let the
3608 * frontend know that WRITE buffers are ready.
3610 ret = cmd->se_tfo->write_pending(cmd);
3611 if (ret == -EAGAIN || ret == -ENOMEM)
3619 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3620 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3621 transport_handle_queue_full(cmd, cmd->se_dev);
3625 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3627 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3628 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
3629 transport_wait_for_tasks(cmd);
3631 transport_release_cmd(cmd);
3634 transport_wait_for_tasks(cmd);
3636 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3639 transport_lun_remove_cmd(cmd);
3641 transport_put_cmd(cmd);
3644 EXPORT_SYMBOL(transport_generic_free_cmd);
3646 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3647 * @se_sess: session to reference
3648 * @se_cmd: command descriptor to add
3649 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
3651 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3654 unsigned long flags;
3656 kref_init(&se_cmd->cmd_kref);
3658 * Add a second kref if the fabric caller is expecting to handle
3659 * fabric acknowledgement that requires two target_put_sess_cmd()
3660 * invocations before se_cmd descriptor release.
3662 if (ack_kref == true) {
3663 kref_get(&se_cmd->cmd_kref);
3664 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
3667 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3668 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3669 se_cmd->check_release = 1;
3670 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3672 EXPORT_SYMBOL(target_get_sess_cmd);
3674 static void target_release_cmd_kref(struct kref *kref)
3676 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3677 struct se_session *se_sess = se_cmd->se_sess;
3678 unsigned long flags;
3680 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3681 if (list_empty(&se_cmd->se_cmd_list)) {
3682 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3683 se_cmd->se_tfo->release_cmd(se_cmd);
3686 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3687 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3688 complete(&se_cmd->cmd_wait_comp);
3691 list_del(&se_cmd->se_cmd_list);
3692 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3694 se_cmd->se_tfo->release_cmd(se_cmd);
3697 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3698 * @se_sess: session to reference
3699 * @se_cmd: command descriptor to drop
3701 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3703 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
3705 EXPORT_SYMBOL(target_put_sess_cmd);
3707 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3708 * @se_sess: session to split
3710 void target_splice_sess_cmd_list(struct se_session *se_sess)
3712 struct se_cmd *se_cmd;
3713 unsigned long flags;
3715 WARN_ON(!list_empty(&se_sess->sess_wait_list));
3716 INIT_LIST_HEAD(&se_sess->sess_wait_list);
3718 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3719 se_sess->sess_tearing_down = 1;
3721 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3723 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3724 se_cmd->cmd_wait_set = 1;
3726 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3728 EXPORT_SYMBOL(target_splice_sess_cmd_list);
3730 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
3731 * @se_sess: session to wait for active I/O
3732 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3734 void target_wait_for_sess_cmds(
3735 struct se_session *se_sess,
3738 struct se_cmd *se_cmd, *tmp_cmd;
3741 list_for_each_entry_safe(se_cmd, tmp_cmd,
3742 &se_sess->sess_wait_list, se_cmd_list) {
3743 list_del(&se_cmd->se_cmd_list);
3745 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3746 " %d\n", se_cmd, se_cmd->t_state,
3747 se_cmd->se_tfo->get_cmd_state(se_cmd));
3749 if (wait_for_tasks) {
3750 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3751 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3752 se_cmd->se_tfo->get_cmd_state(se_cmd));
3754 rc = transport_wait_for_tasks(se_cmd);
3756 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3757 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3758 se_cmd->se_tfo->get_cmd_state(se_cmd));
3762 wait_for_completion(&se_cmd->cmd_wait_comp);
3763 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3764 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3765 se_cmd->se_tfo->get_cmd_state(se_cmd));
3768 se_cmd->se_tfo->release_cmd(se_cmd);
3771 EXPORT_SYMBOL(target_wait_for_sess_cmds);
3773 /* transport_lun_wait_for_tasks():
3775 * Called from ConfigFS context to stop the passed struct se_cmd to allow
3776 * an struct se_lun to be successfully shutdown.
3778 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
3780 unsigned long flags;
3784 * If the frontend has already requested this struct se_cmd to
3785 * be stopped, we can safely ignore this struct se_cmd.
3787 spin_lock_irqsave(&cmd->t_state_lock, flags);
3788 if (cmd->transport_state & CMD_T_STOP) {
3789 cmd->transport_state &= ~CMD_T_LUN_STOP;
3791 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3792 cmd->se_tfo->get_task_tag(cmd));
3793 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3794 transport_cmd_check_stop(cmd, 1, 0);
3797 cmd->transport_state |= CMD_T_LUN_FE_STOP;
3798 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3800 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
3802 // XXX: audit task_flags checks.
3803 spin_lock_irqsave(&cmd->t_state_lock, flags);
3804 if ((cmd->transport_state & CMD_T_BUSY) &&
3805 (cmd->transport_state & CMD_T_SENT)) {
3806 if (!target_stop_cmd(cmd, &flags))
3808 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3810 spin_unlock_irqrestore(&cmd->t_state_lock,
3812 target_remove_from_execute_list(cmd);
3815 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3818 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
3819 cmd->se_tfo->get_task_tag(cmd));
3820 wait_for_completion(&cmd->transport_lun_stop_comp);
3821 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
3822 cmd->se_tfo->get_task_tag(cmd));
3824 transport_remove_cmd_from_queue(cmd);
3829 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
3831 struct se_cmd *cmd = NULL;
3832 unsigned long lun_flags, cmd_flags;
3834 * Do exception processing and return CHECK_CONDITION status to the
3837 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3838 while (!list_empty(&lun->lun_cmd_list)) {
3839 cmd = list_first_entry(&lun->lun_cmd_list,
3840 struct se_cmd, se_lun_node);
3841 list_del_init(&cmd->se_lun_node);
3844 * This will notify iscsi_target_transport.c:
3845 * transport_cmd_check_stop() that a LUN shutdown is in
3846 * progress for the iscsi_cmd_t.
3848 spin_lock(&cmd->t_state_lock);
3849 pr_debug("SE_LUN[%d] - Setting cmd->transport"
3850 "_lun_stop for ITT: 0x%08x\n",
3851 cmd->se_lun->unpacked_lun,
3852 cmd->se_tfo->get_task_tag(cmd));
3853 cmd->transport_state |= CMD_T_LUN_STOP;
3854 spin_unlock(&cmd->t_state_lock);
3856 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3859 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
3860 cmd->se_tfo->get_task_tag(cmd),
3861 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
3865 * If the Storage engine still owns the iscsi_cmd_t, determine
3866 * and/or stop its context.
3868 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
3869 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
3870 cmd->se_tfo->get_task_tag(cmd));
3872 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
3873 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3877 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
3878 "_wait_for_tasks(): SUCCESS\n",
3879 cmd->se_lun->unpacked_lun,
3880 cmd->se_tfo->get_task_tag(cmd));
3882 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3883 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
3884 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3887 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3888 target_remove_from_state_list(cmd);
3889 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3892 * The Storage engine stopped this struct se_cmd before it was
3893 * send to the fabric frontend for delivery back to the
3894 * Initiator Node. Return this SCSI CDB back with an
3895 * CHECK_CONDITION status.
3898 transport_send_check_condition_and_sense(cmd,
3899 TCM_NON_EXISTENT_LUN, 0);
3901 * If the fabric frontend is waiting for this iscsi_cmd_t to
3902 * be released, notify the waiting thread now that LU has
3903 * finished accessing it.
3905 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3906 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
3907 pr_debug("SE_LUN[%d] - Detected FE stop for"
3908 " struct se_cmd: %p ITT: 0x%08x\n",
3910 cmd, cmd->se_tfo->get_task_tag(cmd));
3912 spin_unlock_irqrestore(&cmd->t_state_lock,
3914 transport_cmd_check_stop(cmd, 1, 0);
3915 complete(&cmd->transport_lun_fe_stop_comp);
3916 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3919 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
3920 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
3922 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3923 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3925 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3928 static int transport_clear_lun_thread(void *p)
3930 struct se_lun *lun = p;
3932 __transport_clear_lun_from_sessions(lun);
3933 complete(&lun->lun_shutdown_comp);
3938 int transport_clear_lun_from_sessions(struct se_lun *lun)
3940 struct task_struct *kt;
3942 kt = kthread_run(transport_clear_lun_thread, lun,
3943 "tcm_cl_%u", lun->unpacked_lun);
3945 pr_err("Unable to start clear_lun thread\n");
3948 wait_for_completion(&lun->lun_shutdown_comp);
3954 * transport_wait_for_tasks - wait for completion to occur
3955 * @cmd: command to wait
3957 * Called from frontend fabric context to wait for storage engine
3958 * to pause and/or release frontend generated struct se_cmd.
3960 bool transport_wait_for_tasks(struct se_cmd *cmd)
3962 unsigned long flags;
3964 spin_lock_irqsave(&cmd->t_state_lock, flags);
3965 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
3966 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3967 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3971 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3972 * has been set in transport_set_supported_SAM_opcode().
3974 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
3975 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3976 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3980 * If we are already stopped due to an external event (ie: LUN shutdown)
3981 * sleep until the connection can have the passed struct se_cmd back.
3982 * The cmd->transport_lun_stopped_sem will be upped by
3983 * transport_clear_lun_from_sessions() once the ConfigFS context caller
3984 * has completed its operation on the struct se_cmd.
3986 if (cmd->transport_state & CMD_T_LUN_STOP) {
3987 pr_debug("wait_for_tasks: Stopping"
3988 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
3989 "_stop_comp); for ITT: 0x%08x\n",
3990 cmd->se_tfo->get_task_tag(cmd));
3992 * There is a special case for WRITES where a FE exception +
3993 * LUN shutdown means ConfigFS context is still sleeping on
3994 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3995 * We go ahead and up transport_lun_stop_comp just to be sure
3998 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3999 complete(&cmd->transport_lun_stop_comp);
4000 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4001 spin_lock_irqsave(&cmd->t_state_lock, flags);
4003 target_remove_from_state_list(cmd);
4005 * At this point, the frontend who was the originator of this
4006 * struct se_cmd, now owns the structure and can be released through
4007 * normal means below.
4009 pr_debug("wait_for_tasks: Stopped"
4010 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4011 "stop_comp); for ITT: 0x%08x\n",
4012 cmd->se_tfo->get_task_tag(cmd));
4014 cmd->transport_state &= ~CMD_T_LUN_STOP;
4017 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
4018 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4022 cmd->transport_state |= CMD_T_STOP;
4024 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4025 " i_state: %d, t_state: %d, CMD_T_STOP\n",
4026 cmd, cmd->se_tfo->get_task_tag(cmd),
4027 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4029 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4031 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4033 wait_for_completion(&cmd->t_transport_stop_comp);
4035 spin_lock_irqsave(&cmd->t_state_lock, flags);
4036 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
4038 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4039 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4040 cmd->se_tfo->get_task_tag(cmd));
4042 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4046 EXPORT_SYMBOL(transport_wait_for_tasks);
4048 static int transport_get_sense_codes(
4053 *asc = cmd->scsi_asc;
4054 *ascq = cmd->scsi_ascq;
4059 static int transport_set_sense_codes(
4064 cmd->scsi_asc = asc;
4065 cmd->scsi_ascq = ascq;
4070 int transport_send_check_condition_and_sense(
4075 unsigned char *buffer = cmd->sense_buffer;
4076 unsigned long flags;
4078 u8 asc = 0, ascq = 0;
4080 spin_lock_irqsave(&cmd->t_state_lock, flags);
4081 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4082 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4085 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4086 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4088 if (!reason && from_transport)
4091 if (!from_transport)
4092 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4094 * Data Segment and SenseLength of the fabric response PDU.
4096 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4097 * from include/scsi/scsi_cmnd.h
4099 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4100 TRANSPORT_SENSE_BUFFER);
4102 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4103 * SENSE KEY values from include/scsi/scsi.h
4106 case TCM_NON_EXISTENT_LUN:
4108 buffer[offset] = 0x70;
4109 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4110 /* ILLEGAL REQUEST */
4111 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4112 /* LOGICAL UNIT NOT SUPPORTED */
4113 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4115 case TCM_UNSUPPORTED_SCSI_OPCODE:
4116 case TCM_SECTOR_COUNT_TOO_MANY:
4118 buffer[offset] = 0x70;
4119 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4120 /* ILLEGAL REQUEST */
4121 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4122 /* INVALID COMMAND OPERATION CODE */
4123 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4125 case TCM_UNKNOWN_MODE_PAGE:
4127 buffer[offset] = 0x70;
4128 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4129 /* ILLEGAL REQUEST */
4130 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4131 /* INVALID FIELD IN CDB */
4132 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4134 case TCM_CHECK_CONDITION_ABORT_CMD:
4136 buffer[offset] = 0x70;
4137 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4138 /* ABORTED COMMAND */
4139 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4140 /* BUS DEVICE RESET FUNCTION OCCURRED */
4141 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4142 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4144 case TCM_INCORRECT_AMOUNT_OF_DATA:
4146 buffer[offset] = 0x70;
4147 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4148 /* ABORTED COMMAND */
4149 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4151 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4152 /* NOT ENOUGH UNSOLICITED DATA */
4153 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4155 case TCM_INVALID_CDB_FIELD:
4157 buffer[offset] = 0x70;
4158 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4159 /* ILLEGAL REQUEST */
4160 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4161 /* INVALID FIELD IN CDB */
4162 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4164 case TCM_INVALID_PARAMETER_LIST:
4166 buffer[offset] = 0x70;
4167 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4168 /* ILLEGAL REQUEST */
4169 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4170 /* INVALID FIELD IN PARAMETER LIST */
4171 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4173 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4175 buffer[offset] = 0x70;
4176 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4177 /* ABORTED COMMAND */
4178 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4180 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4181 /* UNEXPECTED_UNSOLICITED_DATA */
4182 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4184 case TCM_SERVICE_CRC_ERROR:
4186 buffer[offset] = 0x70;
4187 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4188 /* ABORTED COMMAND */
4189 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4190 /* PROTOCOL SERVICE CRC ERROR */
4191 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4193 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4195 case TCM_SNACK_REJECTED:
4197 buffer[offset] = 0x70;
4198 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4199 /* ABORTED COMMAND */
4200 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4202 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4203 /* FAILED RETRANSMISSION REQUEST */
4204 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4206 case TCM_WRITE_PROTECTED:
4208 buffer[offset] = 0x70;
4209 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4211 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4212 /* WRITE PROTECTED */
4213 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4215 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4217 buffer[offset] = 0x70;
4218 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4219 /* UNIT ATTENTION */
4220 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4221 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4222 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4223 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4225 case TCM_CHECK_CONDITION_NOT_READY:
4227 buffer[offset] = 0x70;
4228 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4230 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4231 transport_get_sense_codes(cmd, &asc, &ascq);
4232 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4233 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4235 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4238 buffer[offset] = 0x70;
4239 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4240 /* ILLEGAL REQUEST */
4241 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4242 /* LOGICAL UNIT COMMUNICATION FAILURE */
4243 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4247 * This code uses linux/include/scsi/scsi.h SAM status codes!
4249 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4251 * Automatically padded, this value is encoded in the fabric's
4252 * data_length response PDU containing the SCSI defined sense data.
4254 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4257 return cmd->se_tfo->queue_status(cmd);
4259 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4261 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4265 if (cmd->transport_state & CMD_T_ABORTED) {
4267 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4270 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4271 " status for CDB: 0x%02x ITT: 0x%08x\n",
4273 cmd->se_tfo->get_task_tag(cmd));
4275 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4276 cmd->se_tfo->queue_status(cmd);
4281 EXPORT_SYMBOL(transport_check_aborted_status);
4283 void transport_send_task_abort(struct se_cmd *cmd)
4285 unsigned long flags;
4287 spin_lock_irqsave(&cmd->t_state_lock, flags);
4288 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4289 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4292 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4295 * If there are still expected incoming fabric WRITEs, we wait
4296 * until until they have completed before sending a TASK_ABORTED
4297 * response. This response with TASK_ABORTED status will be
4298 * queued back to fabric module by transport_check_aborted_status().
4300 if (cmd->data_direction == DMA_TO_DEVICE) {
4301 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4302 cmd->transport_state |= CMD_T_ABORTED;
4303 smp_mb__after_atomic_inc();
4306 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4308 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4309 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4310 cmd->se_tfo->get_task_tag(cmd));
4312 cmd->se_tfo->queue_status(cmd);
4315 static int transport_generic_do_tmr(struct se_cmd *cmd)
4317 struct se_device *dev = cmd->se_dev;
4318 struct se_tmr_req *tmr = cmd->se_tmr_req;
4321 switch (tmr->function) {
4322 case TMR_ABORT_TASK:
4323 core_tmr_abort_task(dev, tmr, cmd->se_sess);
4325 case TMR_ABORT_TASK_SET:
4327 case TMR_CLEAR_TASK_SET:
4328 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4331 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4332 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4333 TMR_FUNCTION_REJECTED;
4335 case TMR_TARGET_WARM_RESET:
4336 tmr->response = TMR_FUNCTION_REJECTED;
4338 case TMR_TARGET_COLD_RESET:
4339 tmr->response = TMR_FUNCTION_REJECTED;
4342 pr_err("Uknown TMR function: 0x%02x.\n",
4344 tmr->response = TMR_FUNCTION_REJECTED;
4348 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4349 cmd->se_tfo->queue_tm_rsp(cmd);
4351 transport_cmd_check_stop_to_fabric(cmd);
4355 /* transport_processing_thread():
4359 static int transport_processing_thread(void *param)
4363 struct se_device *dev = param;
4365 while (!kthread_should_stop()) {
4366 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4367 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4368 kthread_should_stop());
4373 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4377 switch (cmd->t_state) {
4378 case TRANSPORT_NEW_CMD:
4381 case TRANSPORT_NEW_CMD_MAP:
4382 if (!cmd->se_tfo->new_cmd_map) {
4383 pr_err("cmd->se_tfo->new_cmd_map is"
4384 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4387 ret = cmd->se_tfo->new_cmd_map(cmd);
4389 transport_generic_request_failure(cmd);
4392 ret = transport_generic_new_cmd(cmd);
4394 transport_generic_request_failure(cmd);
4398 case TRANSPORT_PROCESS_WRITE:
4399 transport_generic_process_write(cmd);
4401 case TRANSPORT_PROCESS_TMR:
4402 transport_generic_do_tmr(cmd);
4404 case TRANSPORT_COMPLETE_QF_WP:
4405 transport_write_pending_qf(cmd);
4407 case TRANSPORT_COMPLETE_QF_OK:
4408 transport_complete_qf(cmd);
4411 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4412 "i_state: %d on SE LUN: %u\n",
4414 cmd->se_tfo->get_task_tag(cmd),
4415 cmd->se_tfo->get_cmd_state(cmd),
4416 cmd->se_lun->unpacked_lun);
4424 WARN_ON(!list_empty(&dev->state_list));
4425 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4426 dev->process_thread = NULL;