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 struct workqueue_struct *target_completion_wq;
59 static struct kmem_cache *se_sess_cache;
60 struct kmem_cache *se_ua_cache;
61 struct kmem_cache *t10_pr_reg_cache;
62 struct kmem_cache *t10_alua_lu_gp_cache;
63 struct kmem_cache *t10_alua_lu_gp_mem_cache;
64 struct kmem_cache *t10_alua_tg_pt_gp_cache;
65 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
67 static void transport_complete_task_attr(struct se_cmd *cmd);
68 static void transport_handle_queue_full(struct se_cmd *cmd,
69 struct se_device *dev);
70 static int transport_generic_get_mem(struct se_cmd *cmd);
71 static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
72 static void transport_put_cmd(struct se_cmd *cmd);
73 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
74 static void target_complete_ok_work(struct work_struct *work);
76 int init_se_kmem_caches(void)
78 se_sess_cache = kmem_cache_create("se_sess_cache",
79 sizeof(struct se_session), __alignof__(struct se_session),
82 pr_err("kmem_cache_create() for struct se_session"
86 se_ua_cache = kmem_cache_create("se_ua_cache",
87 sizeof(struct se_ua), __alignof__(struct se_ua),
90 pr_err("kmem_cache_create() for struct se_ua failed\n");
91 goto out_free_sess_cache;
93 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
94 sizeof(struct t10_pr_registration),
95 __alignof__(struct t10_pr_registration), 0, NULL);
96 if (!t10_pr_reg_cache) {
97 pr_err("kmem_cache_create() for struct t10_pr_registration"
99 goto out_free_ua_cache;
101 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
102 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
104 if (!t10_alua_lu_gp_cache) {
105 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
107 goto out_free_pr_reg_cache;
109 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
110 sizeof(struct t10_alua_lu_gp_member),
111 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
112 if (!t10_alua_lu_gp_mem_cache) {
113 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
115 goto out_free_lu_gp_cache;
117 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
118 sizeof(struct t10_alua_tg_pt_gp),
119 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
120 if (!t10_alua_tg_pt_gp_cache) {
121 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
123 goto out_free_lu_gp_mem_cache;
125 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
126 "t10_alua_tg_pt_gp_mem_cache",
127 sizeof(struct t10_alua_tg_pt_gp_member),
128 __alignof__(struct t10_alua_tg_pt_gp_member),
130 if (!t10_alua_tg_pt_gp_mem_cache) {
131 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
133 goto out_free_tg_pt_gp_cache;
136 target_completion_wq = alloc_workqueue("target_completion",
138 if (!target_completion_wq)
139 goto out_free_tg_pt_gp_mem_cache;
143 out_free_tg_pt_gp_mem_cache:
144 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
145 out_free_tg_pt_gp_cache:
146 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
147 out_free_lu_gp_mem_cache:
148 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
149 out_free_lu_gp_cache:
150 kmem_cache_destroy(t10_alua_lu_gp_cache);
151 out_free_pr_reg_cache:
152 kmem_cache_destroy(t10_pr_reg_cache);
154 kmem_cache_destroy(se_ua_cache);
156 kmem_cache_destroy(se_sess_cache);
161 void release_se_kmem_caches(void)
163 destroy_workqueue(target_completion_wq);
164 kmem_cache_destroy(se_sess_cache);
165 kmem_cache_destroy(se_ua_cache);
166 kmem_cache_destroy(t10_pr_reg_cache);
167 kmem_cache_destroy(t10_alua_lu_gp_cache);
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
170 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
173 /* This code ensures unique mib indexes are handed out. */
174 static DEFINE_SPINLOCK(scsi_mib_index_lock);
175 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
178 * Allocate a new row index for the entry type specified
180 u32 scsi_get_new_index(scsi_index_t type)
184 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
186 spin_lock(&scsi_mib_index_lock);
187 new_index = ++scsi_mib_index[type];
188 spin_unlock(&scsi_mib_index_lock);
193 void transport_subsystem_check_init(void)
196 static int sub_api_initialized;
198 if (sub_api_initialized)
201 ret = request_module("target_core_iblock");
203 pr_err("Unable to load target_core_iblock\n");
205 ret = request_module("target_core_file");
207 pr_err("Unable to load target_core_file\n");
209 ret = request_module("target_core_pscsi");
211 pr_err("Unable to load target_core_pscsi\n");
213 sub_api_initialized = 1;
216 struct se_session *transport_init_session(void)
218 struct se_session *se_sess;
220 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
222 pr_err("Unable to allocate struct se_session from"
224 return ERR_PTR(-ENOMEM);
226 INIT_LIST_HEAD(&se_sess->sess_list);
227 INIT_LIST_HEAD(&se_sess->sess_acl_list);
228 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
229 spin_lock_init(&se_sess->sess_cmd_lock);
230 kref_init(&se_sess->sess_kref);
234 EXPORT_SYMBOL(transport_init_session);
237 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
239 void __transport_register_session(
240 struct se_portal_group *se_tpg,
241 struct se_node_acl *se_nacl,
242 struct se_session *se_sess,
243 void *fabric_sess_ptr)
245 unsigned char buf[PR_REG_ISID_LEN];
247 se_sess->se_tpg = se_tpg;
248 se_sess->fabric_sess_ptr = fabric_sess_ptr;
250 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
252 * Only set for struct se_session's that will actually be moving I/O.
253 * eg: *NOT* discovery sessions.
257 * If the fabric module supports an ISID based TransportID,
258 * save this value in binary from the fabric I_T Nexus now.
260 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
261 memset(&buf[0], 0, PR_REG_ISID_LEN);
262 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
263 &buf[0], PR_REG_ISID_LEN);
264 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
266 kref_get(&se_nacl->acl_kref);
268 spin_lock_irq(&se_nacl->nacl_sess_lock);
270 * The se_nacl->nacl_sess pointer will be set to the
271 * last active I_T Nexus for each struct se_node_acl.
273 se_nacl->nacl_sess = se_sess;
275 list_add_tail(&se_sess->sess_acl_list,
276 &se_nacl->acl_sess_list);
277 spin_unlock_irq(&se_nacl->nacl_sess_lock);
279 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
281 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
282 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
284 EXPORT_SYMBOL(__transport_register_session);
286 void transport_register_session(
287 struct se_portal_group *se_tpg,
288 struct se_node_acl *se_nacl,
289 struct se_session *se_sess,
290 void *fabric_sess_ptr)
294 spin_lock_irqsave(&se_tpg->session_lock, flags);
295 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
296 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
298 EXPORT_SYMBOL(transport_register_session);
300 void target_release_session(struct kref *kref)
302 struct se_session *se_sess = container_of(kref,
303 struct se_session, sess_kref);
304 struct se_portal_group *se_tpg = se_sess->se_tpg;
306 se_tpg->se_tpg_tfo->close_session(se_sess);
309 void target_get_session(struct se_session *se_sess)
311 kref_get(&se_sess->sess_kref);
313 EXPORT_SYMBOL(target_get_session);
315 void target_put_session(struct se_session *se_sess)
317 struct se_portal_group *tpg = se_sess->se_tpg;
319 if (tpg->se_tpg_tfo->put_session != NULL) {
320 tpg->se_tpg_tfo->put_session(se_sess);
323 kref_put(&se_sess->sess_kref, target_release_session);
325 EXPORT_SYMBOL(target_put_session);
327 static void target_complete_nacl(struct kref *kref)
329 struct se_node_acl *nacl = container_of(kref,
330 struct se_node_acl, acl_kref);
332 complete(&nacl->acl_free_comp);
335 void target_put_nacl(struct se_node_acl *nacl)
337 kref_put(&nacl->acl_kref, target_complete_nacl);
340 void transport_deregister_session_configfs(struct se_session *se_sess)
342 struct se_node_acl *se_nacl;
345 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
347 se_nacl = se_sess->se_node_acl;
349 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
350 if (se_nacl->acl_stop == 0)
351 list_del(&se_sess->sess_acl_list);
353 * If the session list is empty, then clear the pointer.
354 * Otherwise, set the struct se_session pointer from the tail
355 * element of the per struct se_node_acl active session list.
357 if (list_empty(&se_nacl->acl_sess_list))
358 se_nacl->nacl_sess = NULL;
360 se_nacl->nacl_sess = container_of(
361 se_nacl->acl_sess_list.prev,
362 struct se_session, sess_acl_list);
364 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
367 EXPORT_SYMBOL(transport_deregister_session_configfs);
369 void transport_free_session(struct se_session *se_sess)
371 kmem_cache_free(se_sess_cache, se_sess);
373 EXPORT_SYMBOL(transport_free_session);
375 void transport_deregister_session(struct se_session *se_sess)
377 struct se_portal_group *se_tpg = se_sess->se_tpg;
378 struct target_core_fabric_ops *se_tfo;
379 struct se_node_acl *se_nacl;
381 bool comp_nacl = true;
384 transport_free_session(se_sess);
387 se_tfo = se_tpg->se_tpg_tfo;
389 spin_lock_irqsave(&se_tpg->session_lock, flags);
390 list_del(&se_sess->sess_list);
391 se_sess->se_tpg = NULL;
392 se_sess->fabric_sess_ptr = NULL;
393 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
396 * Determine if we need to do extra work for this initiator node's
397 * struct se_node_acl if it had been previously dynamically generated.
399 se_nacl = se_sess->se_node_acl;
401 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
402 if (se_nacl && se_nacl->dynamic_node_acl) {
403 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
404 list_del(&se_nacl->acl_list);
405 se_tpg->num_node_acls--;
406 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
407 core_tpg_wait_for_nacl_pr_ref(se_nacl);
408 core_free_device_list_for_node(se_nacl, se_tpg);
409 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
412 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
415 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
417 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
418 se_tpg->se_tpg_tfo->get_fabric_name());
420 * If last kref is dropping now for an explict NodeACL, awake sleeping
421 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
424 if (se_nacl && comp_nacl == true)
425 target_put_nacl(se_nacl);
427 transport_free_session(se_sess);
429 EXPORT_SYMBOL(transport_deregister_session);
432 * Called with cmd->t_state_lock held.
434 static void target_remove_from_state_list(struct se_cmd *cmd)
436 struct se_device *dev = cmd->se_dev;
442 if (cmd->transport_state & CMD_T_BUSY)
445 spin_lock_irqsave(&dev->execute_task_lock, flags);
446 if (cmd->state_active) {
447 list_del(&cmd->state_list);
448 cmd->state_active = false;
450 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
453 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
457 spin_lock_irqsave(&cmd->t_state_lock, flags);
459 * Determine if IOCTL context caller in requesting the stopping of this
460 * command for LUN shutdown purposes.
462 if (cmd->transport_state & CMD_T_LUN_STOP) {
463 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
464 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
466 cmd->transport_state &= ~CMD_T_ACTIVE;
467 if (remove_from_lists)
468 target_remove_from_state_list(cmd);
469 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
471 complete(&cmd->transport_lun_stop_comp);
475 if (remove_from_lists) {
476 target_remove_from_state_list(cmd);
479 * Clear struct se_cmd->se_lun before the handoff to FE.
485 * Determine if frontend context caller is requesting the stopping of
486 * this command for frontend exceptions.
488 if (cmd->transport_state & CMD_T_STOP) {
489 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
491 cmd->se_tfo->get_task_tag(cmd));
493 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
495 complete(&cmd->t_transport_stop_comp);
499 cmd->transport_state &= ~CMD_T_ACTIVE;
500 if (remove_from_lists) {
502 * Some fabric modules like tcm_loop can release
503 * their internally allocated I/O reference now and
506 * Fabric modules are expected to return '1' here if the
507 * se_cmd being passed is released at this point,
508 * or zero if not being released.
510 if (cmd->se_tfo->check_stop_free != NULL) {
511 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
512 return cmd->se_tfo->check_stop_free(cmd);
516 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
520 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
522 return transport_cmd_check_stop(cmd, true);
525 static void transport_lun_remove_cmd(struct se_cmd *cmd)
527 struct se_lun *lun = cmd->se_lun;
533 spin_lock_irqsave(&cmd->t_state_lock, flags);
534 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
535 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
536 target_remove_from_state_list(cmd);
538 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
540 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
541 if (!list_empty(&cmd->se_lun_node))
542 list_del_init(&cmd->se_lun_node);
543 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
546 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
548 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
549 transport_lun_remove_cmd(cmd);
551 if (transport_cmd_check_stop_to_fabric(cmd))
554 transport_put_cmd(cmd);
557 static void target_complete_failure_work(struct work_struct *work)
559 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
561 transport_generic_request_failure(cmd);
565 * Used when asking transport to copy Sense Data from the underlying
566 * Linux/SCSI struct scsi_cmnd
568 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
570 struct se_device *dev = cmd->se_dev;
572 WARN_ON(!cmd->se_lun);
577 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
580 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
582 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
583 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
584 return cmd->sense_buffer;
587 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
589 struct se_device *dev = cmd->se_dev;
590 int success = scsi_status == GOOD;
593 cmd->scsi_status = scsi_status;
596 spin_lock_irqsave(&cmd->t_state_lock, flags);
597 cmd->transport_state &= ~CMD_T_BUSY;
599 if (dev && dev->transport->transport_complete) {
600 dev->transport->transport_complete(cmd,
602 transport_get_sense_buffer(cmd));
603 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
608 * See if we are waiting to complete for an exception condition.
610 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
611 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
612 complete(&cmd->task_stop_comp);
617 cmd->transport_state |= CMD_T_FAILED;
620 * Check for case where an explict ABORT_TASK has been received
621 * and transport_wait_for_tasks() will be waiting for completion..
623 if (cmd->transport_state & CMD_T_ABORTED &&
624 cmd->transport_state & CMD_T_STOP) {
625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
626 complete(&cmd->t_transport_stop_comp);
628 } else if (cmd->transport_state & CMD_T_FAILED) {
629 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
630 INIT_WORK(&cmd->work, target_complete_failure_work);
632 INIT_WORK(&cmd->work, target_complete_ok_work);
635 cmd->t_state = TRANSPORT_COMPLETE;
636 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
637 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
639 queue_work(target_completion_wq, &cmd->work);
641 EXPORT_SYMBOL(target_complete_cmd);
643 static void target_add_to_state_list(struct se_cmd *cmd)
645 struct se_device *dev = cmd->se_dev;
648 spin_lock_irqsave(&dev->execute_task_lock, flags);
649 if (!cmd->state_active) {
650 list_add_tail(&cmd->state_list, &dev->state_list);
651 cmd->state_active = true;
653 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
657 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
659 static void transport_write_pending_qf(struct se_cmd *cmd);
660 static void transport_complete_qf(struct se_cmd *cmd);
662 static void target_qf_do_work(struct work_struct *work)
664 struct se_device *dev = container_of(work, struct se_device,
666 LIST_HEAD(qf_cmd_list);
667 struct se_cmd *cmd, *cmd_tmp;
669 spin_lock_irq(&dev->qf_cmd_lock);
670 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
671 spin_unlock_irq(&dev->qf_cmd_lock);
673 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
674 list_del(&cmd->se_qf_node);
675 atomic_dec(&dev->dev_qf_count);
676 smp_mb__after_atomic_dec();
678 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
679 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
680 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
681 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
684 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
685 transport_write_pending_qf(cmd);
686 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
687 transport_complete_qf(cmd);
691 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
693 switch (cmd->data_direction) {
696 case DMA_FROM_DEVICE:
700 case DMA_BIDIRECTIONAL:
709 void transport_dump_dev_state(
710 struct se_device *dev,
714 *bl += sprintf(b + *bl, "Status: ");
715 switch (dev->dev_status) {
716 case TRANSPORT_DEVICE_ACTIVATED:
717 *bl += sprintf(b + *bl, "ACTIVATED");
719 case TRANSPORT_DEVICE_DEACTIVATED:
720 *bl += sprintf(b + *bl, "DEACTIVATED");
722 case TRANSPORT_DEVICE_SHUTDOWN:
723 *bl += sprintf(b + *bl, "SHUTDOWN");
725 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
726 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
727 *bl += sprintf(b + *bl, "OFFLINE");
730 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
734 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
735 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
736 dev->se_sub_dev->se_dev_attrib.block_size,
737 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
738 *bl += sprintf(b + *bl, " ");
741 void transport_dump_vpd_proto_id(
743 unsigned char *p_buf,
746 unsigned char buf[VPD_TMP_BUF_SIZE];
749 memset(buf, 0, VPD_TMP_BUF_SIZE);
750 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
752 switch (vpd->protocol_identifier) {
754 sprintf(buf+len, "Fibre Channel\n");
757 sprintf(buf+len, "Parallel SCSI\n");
760 sprintf(buf+len, "SSA\n");
763 sprintf(buf+len, "IEEE 1394\n");
766 sprintf(buf+len, "SCSI Remote Direct Memory Access"
770 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
773 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
776 sprintf(buf+len, "Automation/Drive Interface Transport"
780 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
783 sprintf(buf+len, "Unknown 0x%02x\n",
784 vpd->protocol_identifier);
789 strncpy(p_buf, buf, p_buf_len);
795 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
798 * Check if the Protocol Identifier Valid (PIV) bit is set..
800 * from spc3r23.pdf section 7.5.1
802 if (page_83[1] & 0x80) {
803 vpd->protocol_identifier = (page_83[0] & 0xf0);
804 vpd->protocol_identifier_set = 1;
805 transport_dump_vpd_proto_id(vpd, NULL, 0);
808 EXPORT_SYMBOL(transport_set_vpd_proto_id);
810 int transport_dump_vpd_assoc(
812 unsigned char *p_buf,
815 unsigned char buf[VPD_TMP_BUF_SIZE];
819 memset(buf, 0, VPD_TMP_BUF_SIZE);
820 len = sprintf(buf, "T10 VPD Identifier Association: ");
822 switch (vpd->association) {
824 sprintf(buf+len, "addressed logical unit\n");
827 sprintf(buf+len, "target port\n");
830 sprintf(buf+len, "SCSI target device\n");
833 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
839 strncpy(p_buf, buf, p_buf_len);
846 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
849 * The VPD identification association..
851 * from spc3r23.pdf Section 7.6.3.1 Table 297
853 vpd->association = (page_83[1] & 0x30);
854 return transport_dump_vpd_assoc(vpd, NULL, 0);
856 EXPORT_SYMBOL(transport_set_vpd_assoc);
858 int transport_dump_vpd_ident_type(
860 unsigned char *p_buf,
863 unsigned char buf[VPD_TMP_BUF_SIZE];
867 memset(buf, 0, VPD_TMP_BUF_SIZE);
868 len = sprintf(buf, "T10 VPD Identifier Type: ");
870 switch (vpd->device_identifier_type) {
872 sprintf(buf+len, "Vendor specific\n");
875 sprintf(buf+len, "T10 Vendor ID based\n");
878 sprintf(buf+len, "EUI-64 based\n");
881 sprintf(buf+len, "NAA\n");
884 sprintf(buf+len, "Relative target port identifier\n");
887 sprintf(buf+len, "SCSI name string\n");
890 sprintf(buf+len, "Unsupported: 0x%02x\n",
891 vpd->device_identifier_type);
897 if (p_buf_len < strlen(buf)+1)
899 strncpy(p_buf, buf, p_buf_len);
907 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
910 * The VPD identifier type..
912 * from spc3r23.pdf Section 7.6.3.1 Table 298
914 vpd->device_identifier_type = (page_83[1] & 0x0f);
915 return transport_dump_vpd_ident_type(vpd, NULL, 0);
917 EXPORT_SYMBOL(transport_set_vpd_ident_type);
919 int transport_dump_vpd_ident(
921 unsigned char *p_buf,
924 unsigned char buf[VPD_TMP_BUF_SIZE];
927 memset(buf, 0, VPD_TMP_BUF_SIZE);
929 switch (vpd->device_identifier_code_set) {
930 case 0x01: /* Binary */
931 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
932 &vpd->device_identifier[0]);
934 case 0x02: /* ASCII */
935 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
936 &vpd->device_identifier[0]);
938 case 0x03: /* UTF-8 */
939 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
940 &vpd->device_identifier[0]);
943 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
944 " 0x%02x", vpd->device_identifier_code_set);
950 strncpy(p_buf, buf, p_buf_len);
958 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
960 static const char hex_str[] = "0123456789abcdef";
961 int j = 0, i = 4; /* offset to start of the identifier */
964 * The VPD Code Set (encoding)
966 * from spc3r23.pdf Section 7.6.3.1 Table 296
968 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
969 switch (vpd->device_identifier_code_set) {
970 case 0x01: /* Binary */
971 vpd->device_identifier[j++] =
972 hex_str[vpd->device_identifier_type];
973 while (i < (4 + page_83[3])) {
974 vpd->device_identifier[j++] =
975 hex_str[(page_83[i] & 0xf0) >> 4];
976 vpd->device_identifier[j++] =
977 hex_str[page_83[i] & 0x0f];
981 case 0x02: /* ASCII */
982 case 0x03: /* UTF-8 */
983 while (i < (4 + page_83[3]))
984 vpd->device_identifier[j++] = page_83[i++];
990 return transport_dump_vpd_ident(vpd, NULL, 0);
992 EXPORT_SYMBOL(transport_set_vpd_ident);
994 static void core_setup_task_attr_emulation(struct se_device *dev)
997 * If this device is from Target_Core_Mod/pSCSI, disable the
998 * SAM Task Attribute emulation.
1000 * This is currently not available in upsream Linux/SCSI Target
1001 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1003 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1004 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1008 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1009 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1010 " device\n", dev->transport->name,
1011 dev->transport->get_device_rev(dev));
1014 static void scsi_dump_inquiry(struct se_device *dev)
1016 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1020 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1022 for (i = 0; i < 8; i++)
1023 if (wwn->vendor[i] >= 0x20)
1024 buf[i] = wwn->vendor[i];
1028 pr_debug(" Vendor: %s\n", buf);
1030 for (i = 0; i < 16; i++)
1031 if (wwn->model[i] >= 0x20)
1032 buf[i] = wwn->model[i];
1036 pr_debug(" Model: %s\n", buf);
1038 for (i = 0; i < 4; i++)
1039 if (wwn->revision[i] >= 0x20)
1040 buf[i] = wwn->revision[i];
1044 pr_debug(" Revision: %s\n", buf);
1046 device_type = dev->transport->get_device_type(dev);
1047 pr_debug(" Type: %s ", scsi_device_type(device_type));
1048 pr_debug(" ANSI SCSI revision: %02x\n",
1049 dev->transport->get_device_rev(dev));
1052 struct se_device *transport_add_device_to_core_hba(
1054 struct se_subsystem_api *transport,
1055 struct se_subsystem_dev *se_dev,
1057 void *transport_dev,
1058 struct se_dev_limits *dev_limits,
1059 const char *inquiry_prod,
1060 const char *inquiry_rev)
1063 struct se_device *dev;
1065 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1067 pr_err("Unable to allocate memory for se_dev_t\n");
1071 dev->dev_flags = device_flags;
1072 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1073 dev->dev_ptr = transport_dev;
1075 dev->se_sub_dev = se_dev;
1076 dev->transport = transport;
1077 INIT_LIST_HEAD(&dev->dev_list);
1078 INIT_LIST_HEAD(&dev->dev_sep_list);
1079 INIT_LIST_HEAD(&dev->dev_tmr_list);
1080 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1081 INIT_LIST_HEAD(&dev->state_list);
1082 INIT_LIST_HEAD(&dev->qf_cmd_list);
1083 spin_lock_init(&dev->execute_task_lock);
1084 spin_lock_init(&dev->delayed_cmd_lock);
1085 spin_lock_init(&dev->dev_reservation_lock);
1086 spin_lock_init(&dev->dev_status_lock);
1087 spin_lock_init(&dev->se_port_lock);
1088 spin_lock_init(&dev->se_tmr_lock);
1089 spin_lock_init(&dev->qf_cmd_lock);
1090 atomic_set(&dev->dev_ordered_id, 0);
1092 se_dev_set_default_attribs(dev, dev_limits);
1094 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1095 dev->creation_time = get_jiffies_64();
1096 spin_lock_init(&dev->stats_lock);
1098 spin_lock(&hba->device_lock);
1099 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1101 spin_unlock(&hba->device_lock);
1103 * Setup the SAM Task Attribute emulation for struct se_device
1105 core_setup_task_attr_emulation(dev);
1107 * Force PR and ALUA passthrough emulation with internal object use.
1109 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1111 * Setup the Reservations infrastructure for struct se_device
1113 core_setup_reservations(dev, force_pt);
1115 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1117 if (core_setup_alua(dev, force_pt) < 0)
1121 * Startup the struct se_device processing thread
1123 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1124 dev->transport->name);
1126 pr_err("Unable to create tmr workqueue for %s\n",
1127 dev->transport->name);
1131 * Setup work_queue for QUEUE_FULL
1133 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1135 * Preload the initial INQUIRY const values if we are doing
1136 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1137 * passthrough because this is being provided by the backend LLD.
1138 * This is required so that transport_get_inquiry() copies these
1139 * originals once back into DEV_T10_WWN(dev) for the virtual device
1142 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1143 if (!inquiry_prod || !inquiry_rev) {
1144 pr_err("All non TCM/pSCSI plugins require"
1145 " INQUIRY consts\n");
1149 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1150 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1151 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1153 scsi_dump_inquiry(dev);
1158 destroy_workqueue(dev->tmr_wq);
1160 spin_lock(&hba->device_lock);
1161 list_del(&dev->dev_list);
1163 spin_unlock(&hba->device_lock);
1165 se_release_vpd_for_dev(dev);
1171 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1173 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1175 struct se_device *dev = cmd->se_dev;
1177 if (cmd->unknown_data_length) {
1178 cmd->data_length = size;
1179 } else if (size != cmd->data_length) {
1180 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1181 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1182 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1183 cmd->data_length, size, cmd->t_task_cdb[0]);
1185 if (cmd->data_direction == DMA_TO_DEVICE) {
1186 pr_err("Rejecting underflow/overflow"
1188 goto out_invalid_cdb_field;
1191 * Reject READ_* or WRITE_* with overflow/underflow for
1192 * type SCF_SCSI_DATA_CDB.
1194 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1195 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1196 " CDB on non 512-byte sector setup subsystem"
1197 " plugin: %s\n", dev->transport->name);
1198 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1199 goto out_invalid_cdb_field;
1202 * For the overflow case keep the existing fabric provided
1203 * ->data_length. Otherwise for the underflow case, reset
1204 * ->data_length to the smaller SCSI expected data transfer
1207 if (size > cmd->data_length) {
1208 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1209 cmd->residual_count = (size - cmd->data_length);
1211 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1212 cmd->residual_count = (cmd->data_length - size);
1213 cmd->data_length = size;
1219 out_invalid_cdb_field:
1220 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1221 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1226 * Used by fabric modules containing a local struct se_cmd within their
1227 * fabric dependent per I/O descriptor.
1229 void transport_init_se_cmd(
1231 struct target_core_fabric_ops *tfo,
1232 struct se_session *se_sess,
1236 unsigned char *sense_buffer)
1238 INIT_LIST_HEAD(&cmd->se_lun_node);
1239 INIT_LIST_HEAD(&cmd->se_delayed_node);
1240 INIT_LIST_HEAD(&cmd->se_qf_node);
1241 INIT_LIST_HEAD(&cmd->se_cmd_list);
1242 INIT_LIST_HEAD(&cmd->state_list);
1243 init_completion(&cmd->transport_lun_fe_stop_comp);
1244 init_completion(&cmd->transport_lun_stop_comp);
1245 init_completion(&cmd->t_transport_stop_comp);
1246 init_completion(&cmd->cmd_wait_comp);
1247 init_completion(&cmd->task_stop_comp);
1248 spin_lock_init(&cmd->t_state_lock);
1249 cmd->transport_state = CMD_T_DEV_ACTIVE;
1252 cmd->se_sess = se_sess;
1253 cmd->data_length = data_length;
1254 cmd->data_direction = data_direction;
1255 cmd->sam_task_attr = task_attr;
1256 cmd->sense_buffer = sense_buffer;
1258 cmd->state_active = false;
1260 EXPORT_SYMBOL(transport_init_se_cmd);
1262 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1265 * Check if SAM Task Attribute emulation is enabled for this
1266 * struct se_device storage object
1268 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1271 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1272 pr_debug("SAM Task Attribute ACA"
1273 " emulation is not supported\n");
1277 * Used to determine when ORDERED commands should go from
1278 * Dormant to Active status.
1280 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1281 smp_mb__after_atomic_inc();
1282 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1283 cmd->se_ordered_id, cmd->sam_task_attr,
1284 cmd->se_dev->transport->name);
1288 /* target_setup_cmd_from_cdb():
1290 * Called from fabric RX Thread.
1292 int target_setup_cmd_from_cdb(
1296 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1297 u32 pr_reg_type = 0;
1299 unsigned long flags;
1303 * Ensure that the received CDB is less than the max (252 + 8) bytes
1304 * for VARIABLE_LENGTH_CMD
1306 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1307 pr_err("Received SCSI CDB with command_size: %d that"
1308 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1309 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1310 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1311 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1315 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1316 * allocate the additional extended CDB buffer now.. Otherwise
1317 * setup the pointer from __t_task_cdb to t_task_cdb.
1319 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1320 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1322 if (!cmd->t_task_cdb) {
1323 pr_err("Unable to allocate cmd->t_task_cdb"
1324 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1325 scsi_command_size(cdb),
1326 (unsigned long)sizeof(cmd->__t_task_cdb));
1327 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1328 cmd->scsi_sense_reason =
1329 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1333 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1335 * Copy the original CDB into cmd->
1337 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1340 * Check for an existing UNIT ATTENTION condition
1342 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1343 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1344 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1348 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1351 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1352 * The ALUA additional sense code qualifier (ASCQ) is determined
1353 * by the ALUA primary or secondary access state..
1356 pr_debug("[%s]: ALUA TG Port not available, "
1357 "SenseKey: NOT_READY, ASC/ASCQ: "
1359 cmd->se_tfo->get_fabric_name(), alua_ascq);
1361 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1362 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1363 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1366 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1367 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1372 * Check status for SPC-3 Persistent Reservations
1374 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1375 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1376 cmd, cdb, pr_reg_type) != 0) {
1377 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1378 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1379 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1380 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1384 * This means the CDB is allowed for the SCSI Initiator port
1385 * when said port is *NOT* holding the legacy SPC-2 or
1386 * SPC-3 Persistent Reservation.
1390 ret = cmd->se_dev->transport->parse_cdb(cmd);
1394 spin_lock_irqsave(&cmd->t_state_lock, flags);
1395 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1396 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1399 * Check for SAM Task Attribute Emulation
1401 if (transport_check_alloc_task_attr(cmd) < 0) {
1402 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1403 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1406 spin_lock(&cmd->se_lun->lun_sep_lock);
1407 if (cmd->se_lun->lun_sep)
1408 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1409 spin_unlock(&cmd->se_lun->lun_sep_lock);
1412 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1415 * Used by fabric module frontends to queue tasks directly.
1416 * Many only be used from process context only
1418 int transport_handle_cdb_direct(
1425 pr_err("cmd->se_lun is NULL\n");
1428 if (in_interrupt()) {
1430 pr_err("transport_generic_handle_cdb cannot be called"
1431 " from interrupt context\n");
1435 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1436 * outstanding descriptors are handled correctly during shutdown via
1437 * transport_wait_for_tasks()
1439 * Also, we don't take cmd->t_state_lock here as we only expect
1440 * this to be called for initial descriptor submission.
1442 cmd->t_state = TRANSPORT_NEW_CMD;
1443 cmd->transport_state |= CMD_T_ACTIVE;
1446 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1447 * so follow TRANSPORT_NEW_CMD processing thread context usage
1448 * and call transport_generic_request_failure() if necessary..
1450 ret = transport_generic_new_cmd(cmd);
1452 transport_generic_request_failure(cmd);
1456 EXPORT_SYMBOL(transport_handle_cdb_direct);
1459 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1460 * se_cmd + use pre-allocated SGL memory.
1462 * @se_cmd: command descriptor to submit
1463 * @se_sess: associated se_sess for endpoint
1464 * @cdb: pointer to SCSI CDB
1465 * @sense: pointer to SCSI sense buffer
1466 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1467 * @data_length: fabric expected data transfer length
1468 * @task_addr: SAM task attribute
1469 * @data_dir: DMA data direction
1470 * @flags: flags for command submission from target_sc_flags_tables
1471 * @sgl: struct scatterlist memory for unidirectional mapping
1472 * @sgl_count: scatterlist count for unidirectional mapping
1473 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1474 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1476 * Returns non zero to signal active I/O shutdown failure. All other
1477 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1478 * but still return zero here.
1480 * This may only be called from process context, and also currently
1481 * assumes internal allocation of fabric payload buffer by target-core.
1483 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1484 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1485 u32 data_length, int task_attr, int data_dir, int flags,
1486 struct scatterlist *sgl, u32 sgl_count,
1487 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1489 struct se_portal_group *se_tpg;
1492 se_tpg = se_sess->se_tpg;
1494 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1495 BUG_ON(in_interrupt());
1497 * Initialize se_cmd for target operation. From this point
1498 * exceptions are handled by sending exception status via
1499 * target_core_fabric_ops->queue_status() callback
1501 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1502 data_length, data_dir, task_attr, sense);
1503 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1504 se_cmd->unknown_data_length = 1;
1506 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1507 * se_sess->sess_cmd_list. A second kref_get here is necessary
1508 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1509 * kref_put() to happen during fabric packet acknowledgement.
1511 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1515 * Signal bidirectional data payloads to target-core
1517 if (flags & TARGET_SCF_BIDI_OP)
1518 se_cmd->se_cmd_flags |= SCF_BIDI;
1520 * Locate se_lun pointer and attach it to struct se_cmd
1522 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1523 transport_send_check_condition_and_sense(se_cmd,
1524 se_cmd->scsi_sense_reason, 0);
1525 target_put_sess_cmd(se_sess, se_cmd);
1529 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1531 transport_generic_request_failure(se_cmd);
1535 * When a non zero sgl_count has been passed perform SGL passthrough
1536 * mapping for pre-allocated fabric memory instead of having target
1537 * core perform an internal SGL allocation..
1539 if (sgl_count != 0) {
1542 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1543 sgl_bidi, sgl_bidi_count);
1545 transport_generic_request_failure(se_cmd);
1550 * Check if we need to delay processing because of ALUA
1551 * Active/NonOptimized primary access state..
1553 core_alua_check_nonop_delay(se_cmd);
1555 transport_handle_cdb_direct(se_cmd);
1558 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1561 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1563 * @se_cmd: command descriptor to submit
1564 * @se_sess: associated se_sess for endpoint
1565 * @cdb: pointer to SCSI CDB
1566 * @sense: pointer to SCSI sense buffer
1567 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1568 * @data_length: fabric expected data transfer length
1569 * @task_addr: SAM task attribute
1570 * @data_dir: DMA data direction
1571 * @flags: flags for command submission from target_sc_flags_tables
1573 * Returns non zero to signal active I/O shutdown failure. All other
1574 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1575 * but still return zero here.
1577 * This may only be called from process context, and also currently
1578 * assumes internal allocation of fabric payload buffer by target-core.
1580 * It also assumes interal target core SGL memory allocation.
1582 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1583 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1584 u32 data_length, int task_attr, int data_dir, int flags)
1586 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1587 unpacked_lun, data_length, task_attr, data_dir,
1588 flags, NULL, 0, NULL, 0);
1590 EXPORT_SYMBOL(target_submit_cmd);
1592 static void target_complete_tmr_failure(struct work_struct *work)
1594 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1596 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1597 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1598 transport_generic_free_cmd(se_cmd, 0);
1602 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1605 * @se_cmd: command descriptor to submit
1606 * @se_sess: associated se_sess for endpoint
1607 * @sense: pointer to SCSI sense buffer
1608 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1609 * @fabric_context: fabric context for TMR req
1610 * @tm_type: Type of TM request
1611 * @gfp: gfp type for caller
1612 * @tag: referenced task tag for TMR_ABORT_TASK
1613 * @flags: submit cmd flags
1615 * Callable from all contexts.
1618 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1619 unsigned char *sense, u32 unpacked_lun,
1620 void *fabric_tmr_ptr, unsigned char tm_type,
1621 gfp_t gfp, unsigned int tag, int flags)
1623 struct se_portal_group *se_tpg;
1626 se_tpg = se_sess->se_tpg;
1629 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1630 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1632 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1633 * allocation failure.
1635 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1639 if (tm_type == TMR_ABORT_TASK)
1640 se_cmd->se_tmr_req->ref_task_tag = tag;
1642 /* See target_submit_cmd for commentary */
1643 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1645 core_tmr_release_req(se_cmd->se_tmr_req);
1649 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1652 * For callback during failure handling, push this work off
1653 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1655 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1656 schedule_work(&se_cmd->work);
1659 transport_generic_handle_tmr(se_cmd);
1662 EXPORT_SYMBOL(target_submit_tmr);
1665 * If the cmd is active, request it to be stopped and sleep until it
1668 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1670 bool was_active = false;
1672 if (cmd->transport_state & CMD_T_BUSY) {
1673 cmd->transport_state |= CMD_T_REQUEST_STOP;
1674 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1676 pr_debug("cmd %p waiting to complete\n", cmd);
1677 wait_for_completion(&cmd->task_stop_comp);
1678 pr_debug("cmd %p stopped successfully\n", cmd);
1680 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1681 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1682 cmd->transport_state &= ~CMD_T_BUSY;
1690 * Handle SAM-esque emulation for generic transport request failures.
1692 void transport_generic_request_failure(struct se_cmd *cmd)
1696 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1697 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1698 cmd->t_task_cdb[0]);
1699 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1700 cmd->se_tfo->get_cmd_state(cmd),
1701 cmd->t_state, cmd->scsi_sense_reason);
1702 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1703 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1704 (cmd->transport_state & CMD_T_STOP) != 0,
1705 (cmd->transport_state & CMD_T_SENT) != 0);
1708 * For SAM Task Attribute emulation for failed struct se_cmd
1710 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1711 transport_complete_task_attr(cmd);
1713 switch (cmd->scsi_sense_reason) {
1714 case TCM_NON_EXISTENT_LUN:
1715 case TCM_UNSUPPORTED_SCSI_OPCODE:
1716 case TCM_INVALID_CDB_FIELD:
1717 case TCM_INVALID_PARAMETER_LIST:
1718 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1719 case TCM_UNKNOWN_MODE_PAGE:
1720 case TCM_WRITE_PROTECTED:
1721 case TCM_ADDRESS_OUT_OF_RANGE:
1722 case TCM_CHECK_CONDITION_ABORT_CMD:
1723 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1724 case TCM_CHECK_CONDITION_NOT_READY:
1726 case TCM_RESERVATION_CONFLICT:
1728 * No SENSE Data payload for this case, set SCSI Status
1729 * and queue the response to $FABRIC_MOD.
1731 * Uses linux/include/scsi/scsi.h SAM status codes defs
1733 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1735 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1736 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1739 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1742 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1743 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1744 cmd->orig_fe_lun, 0x2C,
1745 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1747 ret = cmd->se_tfo->queue_status(cmd);
1748 if (ret == -EAGAIN || ret == -ENOMEM)
1752 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1753 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1754 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1758 ret = transport_send_check_condition_and_sense(cmd,
1759 cmd->scsi_sense_reason, 0);
1760 if (ret == -EAGAIN || ret == -ENOMEM)
1764 transport_lun_remove_cmd(cmd);
1765 if (!transport_cmd_check_stop_to_fabric(cmd))
1770 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1771 transport_handle_queue_full(cmd, cmd->se_dev);
1773 EXPORT_SYMBOL(transport_generic_request_failure);
1775 static void __target_execute_cmd(struct se_cmd *cmd)
1779 spin_lock_irq(&cmd->t_state_lock);
1780 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1781 spin_unlock_irq(&cmd->t_state_lock);
1783 if (cmd->execute_cmd)
1784 error = cmd->execute_cmd(cmd);
1787 spin_lock_irq(&cmd->t_state_lock);
1788 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1789 spin_unlock_irq(&cmd->t_state_lock);
1791 transport_generic_request_failure(cmd);
1795 void target_execute_cmd(struct se_cmd *cmd)
1797 struct se_device *dev = cmd->se_dev;
1800 * If the received CDB has aleady been aborted stop processing it here.
1802 if (transport_check_aborted_status(cmd, 1))
1806 * Determine if IOCTL context caller in requesting the stopping of this
1807 * command for LUN shutdown purposes.
1809 spin_lock_irq(&cmd->t_state_lock);
1810 if (cmd->transport_state & CMD_T_LUN_STOP) {
1811 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1812 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1814 cmd->transport_state &= ~CMD_T_ACTIVE;
1815 spin_unlock_irq(&cmd->t_state_lock);
1816 complete(&cmd->transport_lun_stop_comp);
1820 * Determine if frontend context caller is requesting the stopping of
1821 * this command for frontend exceptions.
1823 if (cmd->transport_state & CMD_T_STOP) {
1824 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1826 cmd->se_tfo->get_task_tag(cmd));
1828 spin_unlock_irq(&cmd->t_state_lock);
1829 complete(&cmd->t_transport_stop_comp);
1833 cmd->t_state = TRANSPORT_PROCESSING;
1834 spin_unlock_irq(&cmd->t_state_lock);
1836 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1840 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1841 * to allow the passed struct se_cmd list of tasks to the front of the list.
1843 switch (cmd->sam_task_attr) {
1845 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1846 "se_ordered_id: %u\n",
1847 cmd->t_task_cdb[0], cmd->se_ordered_id);
1849 case MSG_ORDERED_TAG:
1850 atomic_inc(&dev->dev_ordered_sync);
1851 smp_mb__after_atomic_inc();
1853 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1854 " se_ordered_id: %u\n",
1855 cmd->t_task_cdb[0], cmd->se_ordered_id);
1858 * Execute an ORDERED command if no other older commands
1859 * exist that need to be completed first.
1861 if (!atomic_read(&dev->simple_cmds))
1866 * For SIMPLE and UNTAGGED Task Attribute commands
1868 atomic_inc(&dev->simple_cmds);
1869 smp_mb__after_atomic_inc();
1873 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1874 spin_lock(&dev->delayed_cmd_lock);
1875 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1876 spin_unlock(&dev->delayed_cmd_lock);
1878 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1879 " delayed CMD list, se_ordered_id: %u\n",
1880 cmd->t_task_cdb[0], cmd->sam_task_attr,
1881 cmd->se_ordered_id);
1887 * Otherwise, no ORDERED task attributes exist..
1889 __target_execute_cmd(cmd);
1891 EXPORT_SYMBOL(target_execute_cmd);
1894 * Process all commands up to the last received ORDERED task attribute which
1895 * requires another blocking boundary
1897 static void target_restart_delayed_cmds(struct se_device *dev)
1902 spin_lock(&dev->delayed_cmd_lock);
1903 if (list_empty(&dev->delayed_cmd_list)) {
1904 spin_unlock(&dev->delayed_cmd_lock);
1908 cmd = list_entry(dev->delayed_cmd_list.next,
1909 struct se_cmd, se_delayed_node);
1910 list_del(&cmd->se_delayed_node);
1911 spin_unlock(&dev->delayed_cmd_lock);
1913 __target_execute_cmd(cmd);
1915 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1921 * Called from I/O completion to determine which dormant/delayed
1922 * and ordered cmds need to have their tasks added to the execution queue.
1924 static void transport_complete_task_attr(struct se_cmd *cmd)
1926 struct se_device *dev = cmd->se_dev;
1928 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1929 atomic_dec(&dev->simple_cmds);
1930 smp_mb__after_atomic_dec();
1931 dev->dev_cur_ordered_id++;
1932 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1933 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1934 cmd->se_ordered_id);
1935 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1936 dev->dev_cur_ordered_id++;
1937 pr_debug("Incremented dev_cur_ordered_id: %u for"
1938 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1939 cmd->se_ordered_id);
1940 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1941 atomic_dec(&dev->dev_ordered_sync);
1942 smp_mb__after_atomic_dec();
1944 dev->dev_cur_ordered_id++;
1945 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1946 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1949 target_restart_delayed_cmds(dev);
1952 static void transport_complete_qf(struct se_cmd *cmd)
1956 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1957 transport_complete_task_attr(cmd);
1959 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1960 ret = cmd->se_tfo->queue_status(cmd);
1965 switch (cmd->data_direction) {
1966 case DMA_FROM_DEVICE:
1967 ret = cmd->se_tfo->queue_data_in(cmd);
1970 if (cmd->t_bidi_data_sg) {
1971 ret = cmd->se_tfo->queue_data_in(cmd);
1975 /* Fall through for DMA_TO_DEVICE */
1977 ret = cmd->se_tfo->queue_status(cmd);
1985 transport_handle_queue_full(cmd, cmd->se_dev);
1988 transport_lun_remove_cmd(cmd);
1989 transport_cmd_check_stop_to_fabric(cmd);
1992 static void transport_handle_queue_full(
1994 struct se_device *dev)
1996 spin_lock_irq(&dev->qf_cmd_lock);
1997 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1998 atomic_inc(&dev->dev_qf_count);
1999 smp_mb__after_atomic_inc();
2000 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2002 schedule_work(&cmd->se_dev->qf_work_queue);
2005 static void target_complete_ok_work(struct work_struct *work)
2007 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2011 * Check if we need to move delayed/dormant tasks from cmds on the
2012 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2015 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2016 transport_complete_task_attr(cmd);
2018 * Check to schedule QUEUE_FULL work, or execute an existing
2019 * cmd->transport_qf_callback()
2021 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2022 schedule_work(&cmd->se_dev->qf_work_queue);
2025 * Check if we need to send a sense buffer from
2026 * the struct se_cmd in question.
2028 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2029 WARN_ON(!cmd->scsi_status);
2030 ret = transport_send_check_condition_and_sense(
2032 if (ret == -EAGAIN || ret == -ENOMEM)
2035 transport_lun_remove_cmd(cmd);
2036 transport_cmd_check_stop_to_fabric(cmd);
2040 * Check for a callback, used by amongst other things
2041 * XDWRITE_READ_10 emulation.
2043 if (cmd->transport_complete_callback)
2044 cmd->transport_complete_callback(cmd);
2046 switch (cmd->data_direction) {
2047 case DMA_FROM_DEVICE:
2048 spin_lock(&cmd->se_lun->lun_sep_lock);
2049 if (cmd->se_lun->lun_sep) {
2050 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2053 spin_unlock(&cmd->se_lun->lun_sep_lock);
2055 ret = cmd->se_tfo->queue_data_in(cmd);
2056 if (ret == -EAGAIN || ret == -ENOMEM)
2060 spin_lock(&cmd->se_lun->lun_sep_lock);
2061 if (cmd->se_lun->lun_sep) {
2062 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2065 spin_unlock(&cmd->se_lun->lun_sep_lock);
2067 * Check if we need to send READ payload for BIDI-COMMAND
2069 if (cmd->t_bidi_data_sg) {
2070 spin_lock(&cmd->se_lun->lun_sep_lock);
2071 if (cmd->se_lun->lun_sep) {
2072 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2075 spin_unlock(&cmd->se_lun->lun_sep_lock);
2076 ret = cmd->se_tfo->queue_data_in(cmd);
2077 if (ret == -EAGAIN || ret == -ENOMEM)
2081 /* Fall through for DMA_TO_DEVICE */
2083 ret = cmd->se_tfo->queue_status(cmd);
2084 if (ret == -EAGAIN || ret == -ENOMEM)
2091 transport_lun_remove_cmd(cmd);
2092 transport_cmd_check_stop_to_fabric(cmd);
2096 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2097 " data_direction: %d\n", cmd, cmd->data_direction);
2098 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2099 transport_handle_queue_full(cmd, cmd->se_dev);
2102 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2104 struct scatterlist *sg;
2107 for_each_sg(sgl, sg, nents, count)
2108 __free_page(sg_page(sg));
2113 static inline void transport_free_pages(struct se_cmd *cmd)
2115 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2118 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2119 cmd->t_data_sg = NULL;
2120 cmd->t_data_nents = 0;
2122 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2123 cmd->t_bidi_data_sg = NULL;
2124 cmd->t_bidi_data_nents = 0;
2128 * transport_release_cmd - free a command
2129 * @cmd: command to free
2131 * This routine unconditionally frees a command, and reference counting
2132 * or list removal must be done in the caller.
2134 static void transport_release_cmd(struct se_cmd *cmd)
2136 BUG_ON(!cmd->se_tfo);
2138 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2139 core_tmr_release_req(cmd->se_tmr_req);
2140 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2141 kfree(cmd->t_task_cdb);
2143 * If this cmd has been setup with target_get_sess_cmd(), drop
2144 * the kref and call ->release_cmd() in kref callback.
2146 if (cmd->check_release != 0) {
2147 target_put_sess_cmd(cmd->se_sess, cmd);
2150 cmd->se_tfo->release_cmd(cmd);
2154 * transport_put_cmd - release a reference to a command
2155 * @cmd: command to release
2157 * This routine releases our reference to the command and frees it if possible.
2159 static void transport_put_cmd(struct se_cmd *cmd)
2161 unsigned long flags;
2163 spin_lock_irqsave(&cmd->t_state_lock, flags);
2164 if (atomic_read(&cmd->t_fe_count)) {
2165 if (!atomic_dec_and_test(&cmd->t_fe_count))
2169 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2170 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2171 target_remove_from_state_list(cmd);
2173 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2175 transport_free_pages(cmd);
2176 transport_release_cmd(cmd);
2179 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2183 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2184 * allocating in the core.
2185 * @cmd: Associated se_cmd descriptor
2186 * @mem: SGL style memory for TCM WRITE / READ
2187 * @sg_mem_num: Number of SGL elements
2188 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2189 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2191 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2194 int transport_generic_map_mem_to_cmd(
2196 struct scatterlist *sgl,
2198 struct scatterlist *sgl_bidi,
2201 if (!sgl || !sgl_count)
2205 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2206 * scatterlists already have been set to follow what the fabric
2207 * passes for the original expected data transfer length.
2209 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2210 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2211 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2212 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2213 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2217 cmd->t_data_sg = sgl;
2218 cmd->t_data_nents = sgl_count;
2220 if (sgl_bidi && sgl_bidi_count) {
2221 cmd->t_bidi_data_sg = sgl_bidi;
2222 cmd->t_bidi_data_nents = sgl_bidi_count;
2224 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2227 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2229 void *transport_kmap_data_sg(struct se_cmd *cmd)
2231 struct scatterlist *sg = cmd->t_data_sg;
2232 struct page **pages;
2236 * We need to take into account a possible offset here for fabrics like
2237 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2238 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2240 if (!cmd->t_data_nents)
2244 if (cmd->t_data_nents == 1)
2245 return kmap(sg_page(sg)) + sg->offset;
2247 /* >1 page. use vmap */
2248 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2250 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2254 /* convert sg[] to pages[] */
2255 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2256 pages[i] = sg_page(sg);
2259 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2261 if (!cmd->t_data_vmap) {
2262 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2266 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2268 EXPORT_SYMBOL(transport_kmap_data_sg);
2270 void transport_kunmap_data_sg(struct se_cmd *cmd)
2272 if (!cmd->t_data_nents) {
2274 } else if (cmd->t_data_nents == 1) {
2275 kunmap(sg_page(cmd->t_data_sg));
2279 vunmap(cmd->t_data_vmap);
2280 cmd->t_data_vmap = NULL;
2282 EXPORT_SYMBOL(transport_kunmap_data_sg);
2285 transport_generic_get_mem(struct se_cmd *cmd)
2287 u32 length = cmd->data_length;
2293 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2294 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2295 if (!cmd->t_data_sg)
2298 cmd->t_data_nents = nents;
2299 sg_init_table(cmd->t_data_sg, nents);
2301 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2304 u32 page_len = min_t(u32, length, PAGE_SIZE);
2305 page = alloc_page(GFP_KERNEL | zero_flag);
2309 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2318 __free_page(sg_page(&cmd->t_data_sg[i]));
2320 kfree(cmd->t_data_sg);
2321 cmd->t_data_sg = NULL;
2326 * Allocate any required resources to execute the command. For writes we
2327 * might not have the payload yet, so notify the fabric via a call to
2328 * ->write_pending instead. Otherwise place it on the execution queue.
2330 int transport_generic_new_cmd(struct se_cmd *cmd)
2335 * Determine is the TCM fabric module has already allocated physical
2336 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2339 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2341 ret = transport_generic_get_mem(cmd);
2346 atomic_inc(&cmd->t_fe_count);
2349 * If this command is not a write we can execute it right here,
2350 * for write buffers we need to notify the fabric driver first
2351 * and let it call back once the write buffers are ready.
2353 target_add_to_state_list(cmd);
2354 if (cmd->data_direction != DMA_TO_DEVICE) {
2355 target_execute_cmd(cmd);
2359 spin_lock_irq(&cmd->t_state_lock);
2360 cmd->t_state = TRANSPORT_WRITE_PENDING;
2361 spin_unlock_irq(&cmd->t_state_lock);
2363 transport_cmd_check_stop(cmd, false);
2365 ret = cmd->se_tfo->write_pending(cmd);
2366 if (ret == -EAGAIN || ret == -ENOMEM)
2374 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2375 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2378 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2379 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2380 transport_handle_queue_full(cmd, cmd->se_dev);
2383 EXPORT_SYMBOL(transport_generic_new_cmd);
2385 static void transport_write_pending_qf(struct se_cmd *cmd)
2389 ret = cmd->se_tfo->write_pending(cmd);
2390 if (ret == -EAGAIN || ret == -ENOMEM) {
2391 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2393 transport_handle_queue_full(cmd, cmd->se_dev);
2397 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2399 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2400 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2401 transport_wait_for_tasks(cmd);
2403 transport_release_cmd(cmd);
2406 transport_wait_for_tasks(cmd);
2408 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2411 transport_lun_remove_cmd(cmd);
2413 transport_put_cmd(cmd);
2416 EXPORT_SYMBOL(transport_generic_free_cmd);
2418 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2419 * @se_sess: session to reference
2420 * @se_cmd: command descriptor to add
2421 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2423 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2426 unsigned long flags;
2429 kref_init(&se_cmd->cmd_kref);
2431 * Add a second kref if the fabric caller is expecting to handle
2432 * fabric acknowledgement that requires two target_put_sess_cmd()
2433 * invocations before se_cmd descriptor release.
2435 if (ack_kref == true) {
2436 kref_get(&se_cmd->cmd_kref);
2437 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2440 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2441 if (se_sess->sess_tearing_down) {
2445 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2446 se_cmd->check_release = 1;
2449 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2453 static void target_release_cmd_kref(struct kref *kref)
2455 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2456 struct se_session *se_sess = se_cmd->se_sess;
2457 unsigned long flags;
2459 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2460 if (list_empty(&se_cmd->se_cmd_list)) {
2461 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2462 se_cmd->se_tfo->release_cmd(se_cmd);
2465 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2466 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2467 complete(&se_cmd->cmd_wait_comp);
2470 list_del(&se_cmd->se_cmd_list);
2471 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2473 se_cmd->se_tfo->release_cmd(se_cmd);
2476 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2477 * @se_sess: session to reference
2478 * @se_cmd: command descriptor to drop
2480 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2482 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2484 EXPORT_SYMBOL(target_put_sess_cmd);
2486 /* target_sess_cmd_list_set_waiting - Flag all commands in
2487 * sess_cmd_list to complete cmd_wait_comp. Set
2488 * sess_tearing_down so no more commands are queued.
2489 * @se_sess: session to flag
2491 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2493 struct se_cmd *se_cmd;
2494 unsigned long flags;
2496 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2498 WARN_ON(se_sess->sess_tearing_down);
2499 se_sess->sess_tearing_down = 1;
2501 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2502 se_cmd->cmd_wait_set = 1;
2504 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2506 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2508 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2509 * @se_sess: session to wait for active I/O
2510 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2512 void target_wait_for_sess_cmds(
2513 struct se_session *se_sess,
2516 struct se_cmd *se_cmd, *tmp_cmd;
2519 list_for_each_entry_safe(se_cmd, tmp_cmd,
2520 &se_sess->sess_cmd_list, se_cmd_list) {
2521 list_del(&se_cmd->se_cmd_list);
2523 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2524 " %d\n", se_cmd, se_cmd->t_state,
2525 se_cmd->se_tfo->get_cmd_state(se_cmd));
2527 if (wait_for_tasks) {
2528 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2529 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2530 se_cmd->se_tfo->get_cmd_state(se_cmd));
2532 rc = transport_wait_for_tasks(se_cmd);
2534 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2535 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2536 se_cmd->se_tfo->get_cmd_state(se_cmd));
2540 wait_for_completion(&se_cmd->cmd_wait_comp);
2541 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2542 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2543 se_cmd->se_tfo->get_cmd_state(se_cmd));
2546 se_cmd->se_tfo->release_cmd(se_cmd);
2549 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2551 /* transport_lun_wait_for_tasks():
2553 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2554 * an struct se_lun to be successfully shutdown.
2556 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2558 unsigned long flags;
2562 * If the frontend has already requested this struct se_cmd to
2563 * be stopped, we can safely ignore this struct se_cmd.
2565 spin_lock_irqsave(&cmd->t_state_lock, flags);
2566 if (cmd->transport_state & CMD_T_STOP) {
2567 cmd->transport_state &= ~CMD_T_LUN_STOP;
2569 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2570 cmd->se_tfo->get_task_tag(cmd));
2571 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2572 transport_cmd_check_stop(cmd, false);
2575 cmd->transport_state |= CMD_T_LUN_FE_STOP;
2576 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2578 // XXX: audit task_flags checks.
2579 spin_lock_irqsave(&cmd->t_state_lock, flags);
2580 if ((cmd->transport_state & CMD_T_BUSY) &&
2581 (cmd->transport_state & CMD_T_SENT)) {
2582 if (!target_stop_cmd(cmd, &flags))
2585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2587 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2590 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2591 cmd->se_tfo->get_task_tag(cmd));
2592 wait_for_completion(&cmd->transport_lun_stop_comp);
2593 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2594 cmd->se_tfo->get_task_tag(cmd));
2600 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2602 struct se_cmd *cmd = NULL;
2603 unsigned long lun_flags, cmd_flags;
2605 * Do exception processing and return CHECK_CONDITION status to the
2608 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2609 while (!list_empty(&lun->lun_cmd_list)) {
2610 cmd = list_first_entry(&lun->lun_cmd_list,
2611 struct se_cmd, se_lun_node);
2612 list_del_init(&cmd->se_lun_node);
2614 spin_lock(&cmd->t_state_lock);
2615 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2616 "_lun_stop for ITT: 0x%08x\n",
2617 cmd->se_lun->unpacked_lun,
2618 cmd->se_tfo->get_task_tag(cmd));
2619 cmd->transport_state |= CMD_T_LUN_STOP;
2620 spin_unlock(&cmd->t_state_lock);
2622 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2625 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2626 cmd->se_tfo->get_task_tag(cmd),
2627 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2631 * If the Storage engine still owns the iscsi_cmd_t, determine
2632 * and/or stop its context.
2634 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2635 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2636 cmd->se_tfo->get_task_tag(cmd));
2638 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2639 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2643 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2644 "_wait_for_tasks(): SUCCESS\n",
2645 cmd->se_lun->unpacked_lun,
2646 cmd->se_tfo->get_task_tag(cmd));
2648 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2649 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2650 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2653 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2654 target_remove_from_state_list(cmd);
2655 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2658 * The Storage engine stopped this struct se_cmd before it was
2659 * send to the fabric frontend for delivery back to the
2660 * Initiator Node. Return this SCSI CDB back with an
2661 * CHECK_CONDITION status.
2664 transport_send_check_condition_and_sense(cmd,
2665 TCM_NON_EXISTENT_LUN, 0);
2667 * If the fabric frontend is waiting for this iscsi_cmd_t to
2668 * be released, notify the waiting thread now that LU has
2669 * finished accessing it.
2671 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2672 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2673 pr_debug("SE_LUN[%d] - Detected FE stop for"
2674 " struct se_cmd: %p ITT: 0x%08x\n",
2676 cmd, cmd->se_tfo->get_task_tag(cmd));
2678 spin_unlock_irqrestore(&cmd->t_state_lock,
2680 transport_cmd_check_stop(cmd, false);
2681 complete(&cmd->transport_lun_fe_stop_comp);
2682 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2685 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2686 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2688 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2689 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2691 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2694 static int transport_clear_lun_thread(void *p)
2696 struct se_lun *lun = p;
2698 __transport_clear_lun_from_sessions(lun);
2699 complete(&lun->lun_shutdown_comp);
2704 int transport_clear_lun_from_sessions(struct se_lun *lun)
2706 struct task_struct *kt;
2708 kt = kthread_run(transport_clear_lun_thread, lun,
2709 "tcm_cl_%u", lun->unpacked_lun);
2711 pr_err("Unable to start clear_lun thread\n");
2714 wait_for_completion(&lun->lun_shutdown_comp);
2720 * transport_wait_for_tasks - wait for completion to occur
2721 * @cmd: command to wait
2723 * Called from frontend fabric context to wait for storage engine
2724 * to pause and/or release frontend generated struct se_cmd.
2726 bool transport_wait_for_tasks(struct se_cmd *cmd)
2728 unsigned long flags;
2730 spin_lock_irqsave(&cmd->t_state_lock, flags);
2731 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2732 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2733 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2737 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2738 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2739 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2743 * If we are already stopped due to an external event (ie: LUN shutdown)
2744 * sleep until the connection can have the passed struct se_cmd back.
2745 * The cmd->transport_lun_stopped_sem will be upped by
2746 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2747 * has completed its operation on the struct se_cmd.
2749 if (cmd->transport_state & CMD_T_LUN_STOP) {
2750 pr_debug("wait_for_tasks: Stopping"
2751 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2752 "_stop_comp); for ITT: 0x%08x\n",
2753 cmd->se_tfo->get_task_tag(cmd));
2755 * There is a special case for WRITES where a FE exception +
2756 * LUN shutdown means ConfigFS context is still sleeping on
2757 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2758 * We go ahead and up transport_lun_stop_comp just to be sure
2761 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2762 complete(&cmd->transport_lun_stop_comp);
2763 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2764 spin_lock_irqsave(&cmd->t_state_lock, flags);
2766 target_remove_from_state_list(cmd);
2768 * At this point, the frontend who was the originator of this
2769 * struct se_cmd, now owns the structure and can be released through
2770 * normal means below.
2772 pr_debug("wait_for_tasks: Stopped"
2773 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2774 "stop_comp); for ITT: 0x%08x\n",
2775 cmd->se_tfo->get_task_tag(cmd));
2777 cmd->transport_state &= ~CMD_T_LUN_STOP;
2780 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2781 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2785 cmd->transport_state |= CMD_T_STOP;
2787 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2788 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2789 cmd, cmd->se_tfo->get_task_tag(cmd),
2790 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2792 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2794 wait_for_completion(&cmd->t_transport_stop_comp);
2796 spin_lock_irqsave(&cmd->t_state_lock, flags);
2797 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2799 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2800 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2801 cmd->se_tfo->get_task_tag(cmd));
2803 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2807 EXPORT_SYMBOL(transport_wait_for_tasks);
2809 static int transport_get_sense_codes(
2814 *asc = cmd->scsi_asc;
2815 *ascq = cmd->scsi_ascq;
2820 static int transport_set_sense_codes(
2825 cmd->scsi_asc = asc;
2826 cmd->scsi_ascq = ascq;
2831 int transport_send_check_condition_and_sense(
2836 unsigned char *buffer = cmd->sense_buffer;
2837 unsigned long flags;
2838 u8 asc = 0, ascq = 0;
2840 spin_lock_irqsave(&cmd->t_state_lock, flags);
2841 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2842 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2845 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2846 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2848 if (!reason && from_transport)
2851 if (!from_transport)
2852 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2855 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2856 * SENSE KEY values from include/scsi/scsi.h
2859 case TCM_NON_EXISTENT_LUN:
2862 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2863 /* ILLEGAL REQUEST */
2864 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2865 /* LOGICAL UNIT NOT SUPPORTED */
2866 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2868 case TCM_UNSUPPORTED_SCSI_OPCODE:
2869 case TCM_SECTOR_COUNT_TOO_MANY:
2872 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2873 /* ILLEGAL REQUEST */
2874 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2875 /* INVALID COMMAND OPERATION CODE */
2876 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2878 case TCM_UNKNOWN_MODE_PAGE:
2881 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2882 /* ILLEGAL REQUEST */
2883 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2884 /* INVALID FIELD IN CDB */
2885 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2887 case TCM_CHECK_CONDITION_ABORT_CMD:
2890 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2891 /* ABORTED COMMAND */
2892 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2893 /* BUS DEVICE RESET FUNCTION OCCURRED */
2894 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2895 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2897 case TCM_INCORRECT_AMOUNT_OF_DATA:
2900 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2901 /* ABORTED COMMAND */
2902 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2904 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2905 /* NOT ENOUGH UNSOLICITED DATA */
2906 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2908 case TCM_INVALID_CDB_FIELD:
2911 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2912 /* ILLEGAL REQUEST */
2913 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2914 /* INVALID FIELD IN CDB */
2915 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2917 case TCM_INVALID_PARAMETER_LIST:
2920 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2921 /* ILLEGAL REQUEST */
2922 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2923 /* INVALID FIELD IN PARAMETER LIST */
2924 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2926 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2929 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2930 /* ABORTED COMMAND */
2931 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2933 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2934 /* UNEXPECTED_UNSOLICITED_DATA */
2935 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2937 case TCM_SERVICE_CRC_ERROR:
2940 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2941 /* ABORTED COMMAND */
2942 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2943 /* PROTOCOL SERVICE CRC ERROR */
2944 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2946 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2948 case TCM_SNACK_REJECTED:
2951 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2952 /* ABORTED COMMAND */
2953 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2955 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2956 /* FAILED RETRANSMISSION REQUEST */
2957 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2959 case TCM_WRITE_PROTECTED:
2962 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2964 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2965 /* WRITE PROTECTED */
2966 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2968 case TCM_ADDRESS_OUT_OF_RANGE:
2971 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2972 /* ILLEGAL REQUEST */
2973 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2974 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2975 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2977 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2980 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2981 /* UNIT ATTENTION */
2982 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2983 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2984 buffer[SPC_ASC_KEY_OFFSET] = asc;
2985 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2987 case TCM_CHECK_CONDITION_NOT_READY:
2990 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2992 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2993 transport_get_sense_codes(cmd, &asc, &ascq);
2994 buffer[SPC_ASC_KEY_OFFSET] = asc;
2995 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2997 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3001 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
3002 /* ILLEGAL REQUEST */
3003 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3004 /* LOGICAL UNIT COMMUNICATION FAILURE */
3005 buffer[SPC_ASC_KEY_OFFSET] = 0x80;
3009 * This code uses linux/include/scsi/scsi.h SAM status codes!
3011 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3013 * Automatically padded, this value is encoded in the fabric's
3014 * data_length response PDU containing the SCSI defined sense data.
3016 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
3019 return cmd->se_tfo->queue_status(cmd);
3021 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3023 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3027 if (cmd->transport_state & CMD_T_ABORTED) {
3029 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3032 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3033 " status for CDB: 0x%02x ITT: 0x%08x\n",
3035 cmd->se_tfo->get_task_tag(cmd));
3037 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3038 cmd->se_tfo->queue_status(cmd);
3043 EXPORT_SYMBOL(transport_check_aborted_status);
3045 void transport_send_task_abort(struct se_cmd *cmd)
3047 unsigned long flags;
3049 spin_lock_irqsave(&cmd->t_state_lock, flags);
3050 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3051 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3054 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3057 * If there are still expected incoming fabric WRITEs, we wait
3058 * until until they have completed before sending a TASK_ABORTED
3059 * response. This response with TASK_ABORTED status will be
3060 * queued back to fabric module by transport_check_aborted_status().
3062 if (cmd->data_direction == DMA_TO_DEVICE) {
3063 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3064 cmd->transport_state |= CMD_T_ABORTED;
3065 smp_mb__after_atomic_inc();
3068 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3070 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3071 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3072 cmd->se_tfo->get_task_tag(cmd));
3074 cmd->se_tfo->queue_status(cmd);
3077 static void target_tmr_work(struct work_struct *work)
3079 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3080 struct se_device *dev = cmd->se_dev;
3081 struct se_tmr_req *tmr = cmd->se_tmr_req;
3084 switch (tmr->function) {
3085 case TMR_ABORT_TASK:
3086 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3088 case TMR_ABORT_TASK_SET:
3090 case TMR_CLEAR_TASK_SET:
3091 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3094 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3095 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3096 TMR_FUNCTION_REJECTED;
3098 case TMR_TARGET_WARM_RESET:
3099 tmr->response = TMR_FUNCTION_REJECTED;
3101 case TMR_TARGET_COLD_RESET:
3102 tmr->response = TMR_FUNCTION_REJECTED;
3105 pr_err("Uknown TMR function: 0x%02x.\n",
3107 tmr->response = TMR_FUNCTION_REJECTED;
3111 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3112 cmd->se_tfo->queue_tm_rsp(cmd);
3114 transport_cmd_check_stop_to_fabric(cmd);
3117 int transport_generic_handle_tmr(
3120 INIT_WORK(&cmd->work, target_tmr_work);
3121 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3124 EXPORT_SYMBOL(transport_generic_handle_tmr);