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target: Allow for target_submit_cmd() returning errors
[deliverable/linux.git] / drivers / target / target_core_transport.c
1 /*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
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
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
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.
17 *
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.
22 *
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.
26 *
27 ******************************************************************************/
28
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>
37 #include <linux/in.h>
38 #include <linux/cdrom.h>
39 #include <linux/module.h>
40 #include <linux/ratelimit.h>
41 #include <asm/unaligned.h>
42 #include <net/sock.h>
43 #include <net/tcp.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/scsi_tcq.h>
47
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>
52
53 #include "target_core_internal.h"
54 #include "target_core_alua.h"
55 #include "target_core_pr.h"
56 #include "target_core_ua.h"
57
58 static int sub_api_initialized;
59
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;
68
69 static void transport_complete_task_attr(struct se_cmd *cmd);
70 static void transport_handle_queue_full(struct se_cmd *cmd,
71 struct se_device *dev);
72 static int transport_generic_get_mem(struct se_cmd *cmd);
73 static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
74 static void transport_put_cmd(struct se_cmd *cmd);
75 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
76 static void target_complete_ok_work(struct work_struct *work);
77
78 int init_se_kmem_caches(void)
79 {
80 se_sess_cache = kmem_cache_create("se_sess_cache",
81 sizeof(struct se_session), __alignof__(struct se_session),
82 0, NULL);
83 if (!se_sess_cache) {
84 pr_err("kmem_cache_create() for struct se_session"
85 " failed\n");
86 goto out;
87 }
88 se_ua_cache = kmem_cache_create("se_ua_cache",
89 sizeof(struct se_ua), __alignof__(struct se_ua),
90 0, NULL);
91 if (!se_ua_cache) {
92 pr_err("kmem_cache_create() for struct se_ua failed\n");
93 goto out_free_sess_cache;
94 }
95 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
96 sizeof(struct t10_pr_registration),
97 __alignof__(struct t10_pr_registration), 0, NULL);
98 if (!t10_pr_reg_cache) {
99 pr_err("kmem_cache_create() for struct t10_pr_registration"
100 " failed\n");
101 goto out_free_ua_cache;
102 }
103 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
104 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
105 0, NULL);
106 if (!t10_alua_lu_gp_cache) {
107 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
108 " failed\n");
109 goto out_free_pr_reg_cache;
110 }
111 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
112 sizeof(struct t10_alua_lu_gp_member),
113 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
114 if (!t10_alua_lu_gp_mem_cache) {
115 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
116 "cache failed\n");
117 goto out_free_lu_gp_cache;
118 }
119 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
120 sizeof(struct t10_alua_tg_pt_gp),
121 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
122 if (!t10_alua_tg_pt_gp_cache) {
123 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
124 "cache failed\n");
125 goto out_free_lu_gp_mem_cache;
126 }
127 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
128 "t10_alua_tg_pt_gp_mem_cache",
129 sizeof(struct t10_alua_tg_pt_gp_member),
130 __alignof__(struct t10_alua_tg_pt_gp_member),
131 0, NULL);
132 if (!t10_alua_tg_pt_gp_mem_cache) {
133 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
134 "mem_t failed\n");
135 goto out_free_tg_pt_gp_cache;
136 }
137
138 target_completion_wq = alloc_workqueue("target_completion",
139 WQ_MEM_RECLAIM, 0);
140 if (!target_completion_wq)
141 goto out_free_tg_pt_gp_mem_cache;
142
143 return 0;
144
145 out_free_tg_pt_gp_mem_cache:
146 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
147 out_free_tg_pt_gp_cache:
148 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
149 out_free_lu_gp_mem_cache:
150 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
151 out_free_lu_gp_cache:
152 kmem_cache_destroy(t10_alua_lu_gp_cache);
153 out_free_pr_reg_cache:
154 kmem_cache_destroy(t10_pr_reg_cache);
155 out_free_ua_cache:
156 kmem_cache_destroy(se_ua_cache);
157 out_free_sess_cache:
158 kmem_cache_destroy(se_sess_cache);
159 out:
160 return -ENOMEM;
161 }
162
163 void release_se_kmem_caches(void)
164 {
165 destroy_workqueue(target_completion_wq);
166 kmem_cache_destroy(se_sess_cache);
167 kmem_cache_destroy(se_ua_cache);
168 kmem_cache_destroy(t10_pr_reg_cache);
169 kmem_cache_destroy(t10_alua_lu_gp_cache);
170 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
171 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
172 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
173 }
174
175 /* This code ensures unique mib indexes are handed out. */
176 static DEFINE_SPINLOCK(scsi_mib_index_lock);
177 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
178
179 /*
180 * Allocate a new row index for the entry type specified
181 */
182 u32 scsi_get_new_index(scsi_index_t type)
183 {
184 u32 new_index;
185
186 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
187
188 spin_lock(&scsi_mib_index_lock);
189 new_index = ++scsi_mib_index[type];
190 spin_unlock(&scsi_mib_index_lock);
191
192 return new_index;
193 }
194
195 void transport_subsystem_check_init(void)
196 {
197 int ret;
198
199 if (sub_api_initialized)
200 return;
201
202 ret = request_module("target_core_iblock");
203 if (ret != 0)
204 pr_err("Unable to load target_core_iblock\n");
205
206 ret = request_module("target_core_file");
207 if (ret != 0)
208 pr_err("Unable to load target_core_file\n");
209
210 ret = request_module("target_core_pscsi");
211 if (ret != 0)
212 pr_err("Unable to load target_core_pscsi\n");
213
214 ret = request_module("target_core_stgt");
215 if (ret != 0)
216 pr_err("Unable to load target_core_stgt\n");
217
218 sub_api_initialized = 1;
219 return;
220 }
221
222 struct se_session *transport_init_session(void)
223 {
224 struct se_session *se_sess;
225
226 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
227 if (!se_sess) {
228 pr_err("Unable to allocate struct se_session from"
229 " se_sess_cache\n");
230 return ERR_PTR(-ENOMEM);
231 }
232 INIT_LIST_HEAD(&se_sess->sess_list);
233 INIT_LIST_HEAD(&se_sess->sess_acl_list);
234 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
235 spin_lock_init(&se_sess->sess_cmd_lock);
236 kref_init(&se_sess->sess_kref);
237
238 return se_sess;
239 }
240 EXPORT_SYMBOL(transport_init_session);
241
242 /*
243 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
244 */
245 void __transport_register_session(
246 struct se_portal_group *se_tpg,
247 struct se_node_acl *se_nacl,
248 struct se_session *se_sess,
249 void *fabric_sess_ptr)
250 {
251 unsigned char buf[PR_REG_ISID_LEN];
252
253 se_sess->se_tpg = se_tpg;
254 se_sess->fabric_sess_ptr = fabric_sess_ptr;
255 /*
256 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
257 *
258 * Only set for struct se_session's that will actually be moving I/O.
259 * eg: *NOT* discovery sessions.
260 */
261 if (se_nacl) {
262 /*
263 * If the fabric module supports an ISID based TransportID,
264 * save this value in binary from the fabric I_T Nexus now.
265 */
266 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
267 memset(&buf[0], 0, PR_REG_ISID_LEN);
268 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
269 &buf[0], PR_REG_ISID_LEN);
270 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
271 }
272 kref_get(&se_nacl->acl_kref);
273
274 spin_lock_irq(&se_nacl->nacl_sess_lock);
275 /*
276 * The se_nacl->nacl_sess pointer will be set to the
277 * last active I_T Nexus for each struct se_node_acl.
278 */
279 se_nacl->nacl_sess = se_sess;
280
281 list_add_tail(&se_sess->sess_acl_list,
282 &se_nacl->acl_sess_list);
283 spin_unlock_irq(&se_nacl->nacl_sess_lock);
284 }
285 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
286
287 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
288 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
289 }
290 EXPORT_SYMBOL(__transport_register_session);
291
292 void transport_register_session(
293 struct se_portal_group *se_tpg,
294 struct se_node_acl *se_nacl,
295 struct se_session *se_sess,
296 void *fabric_sess_ptr)
297 {
298 unsigned long flags;
299
300 spin_lock_irqsave(&se_tpg->session_lock, flags);
301 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
302 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
303 }
304 EXPORT_SYMBOL(transport_register_session);
305
306 void target_release_session(struct kref *kref)
307 {
308 struct se_session *se_sess = container_of(kref,
309 struct se_session, sess_kref);
310 struct se_portal_group *se_tpg = se_sess->se_tpg;
311
312 se_tpg->se_tpg_tfo->close_session(se_sess);
313 }
314
315 void target_get_session(struct se_session *se_sess)
316 {
317 kref_get(&se_sess->sess_kref);
318 }
319 EXPORT_SYMBOL(target_get_session);
320
321 void target_put_session(struct se_session *se_sess)
322 {
323 struct se_portal_group *tpg = se_sess->se_tpg;
324
325 if (tpg->se_tpg_tfo->put_session != NULL) {
326 tpg->se_tpg_tfo->put_session(se_sess);
327 return;
328 }
329 kref_put(&se_sess->sess_kref, target_release_session);
330 }
331 EXPORT_SYMBOL(target_put_session);
332
333 static void target_complete_nacl(struct kref *kref)
334 {
335 struct se_node_acl *nacl = container_of(kref,
336 struct se_node_acl, acl_kref);
337
338 complete(&nacl->acl_free_comp);
339 }
340
341 void target_put_nacl(struct se_node_acl *nacl)
342 {
343 kref_put(&nacl->acl_kref, target_complete_nacl);
344 }
345
346 void transport_deregister_session_configfs(struct se_session *se_sess)
347 {
348 struct se_node_acl *se_nacl;
349 unsigned long flags;
350 /*
351 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
352 */
353 se_nacl = se_sess->se_node_acl;
354 if (se_nacl) {
355 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
356 if (se_nacl->acl_stop == 0)
357 list_del(&se_sess->sess_acl_list);
358 /*
359 * If the session list is empty, then clear the pointer.
360 * Otherwise, set the struct se_session pointer from the tail
361 * element of the per struct se_node_acl active session list.
362 */
363 if (list_empty(&se_nacl->acl_sess_list))
364 se_nacl->nacl_sess = NULL;
365 else {
366 se_nacl->nacl_sess = container_of(
367 se_nacl->acl_sess_list.prev,
368 struct se_session, sess_acl_list);
369 }
370 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
371 }
372 }
373 EXPORT_SYMBOL(transport_deregister_session_configfs);
374
375 void transport_free_session(struct se_session *se_sess)
376 {
377 kmem_cache_free(se_sess_cache, se_sess);
378 }
379 EXPORT_SYMBOL(transport_free_session);
380
381 void transport_deregister_session(struct se_session *se_sess)
382 {
383 struct se_portal_group *se_tpg = se_sess->se_tpg;
384 struct target_core_fabric_ops *se_tfo;
385 struct se_node_acl *se_nacl;
386 unsigned long flags;
387 bool comp_nacl = true;
388
389 if (!se_tpg) {
390 transport_free_session(se_sess);
391 return;
392 }
393 se_tfo = se_tpg->se_tpg_tfo;
394
395 spin_lock_irqsave(&se_tpg->session_lock, flags);
396 list_del(&se_sess->sess_list);
397 se_sess->se_tpg = NULL;
398 se_sess->fabric_sess_ptr = NULL;
399 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
400
401 /*
402 * Determine if we need to do extra work for this initiator node's
403 * struct se_node_acl if it had been previously dynamically generated.
404 */
405 se_nacl = se_sess->se_node_acl;
406
407 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
408 if (se_nacl && se_nacl->dynamic_node_acl) {
409 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
410 list_del(&se_nacl->acl_list);
411 se_tpg->num_node_acls--;
412 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
413 core_tpg_wait_for_nacl_pr_ref(se_nacl);
414 core_free_device_list_for_node(se_nacl, se_tpg);
415 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
416
417 comp_nacl = false;
418 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
419 }
420 }
421 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
422
423 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
424 se_tpg->se_tpg_tfo->get_fabric_name());
425 /*
426 * If last kref is dropping now for an explict NodeACL, awake sleeping
427 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
428 * removal context.
429 */
430 if (se_nacl && comp_nacl == true)
431 target_put_nacl(se_nacl);
432
433 transport_free_session(se_sess);
434 }
435 EXPORT_SYMBOL(transport_deregister_session);
436
437 /*
438 * Called with cmd->t_state_lock held.
439 */
440 static void target_remove_from_state_list(struct se_cmd *cmd)
441 {
442 struct se_device *dev = cmd->se_dev;
443 unsigned long flags;
444
445 if (!dev)
446 return;
447
448 if (cmd->transport_state & CMD_T_BUSY)
449 return;
450
451 spin_lock_irqsave(&dev->execute_task_lock, flags);
452 if (cmd->state_active) {
453 list_del(&cmd->state_list);
454 cmd->state_active = false;
455 }
456 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
457 }
458
459 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
460 {
461 unsigned long flags;
462
463 spin_lock_irqsave(&cmd->t_state_lock, flags);
464 /*
465 * Determine if IOCTL context caller in requesting the stopping of this
466 * command for LUN shutdown purposes.
467 */
468 if (cmd->transport_state & CMD_T_LUN_STOP) {
469 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
470 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
471
472 cmd->transport_state &= ~CMD_T_ACTIVE;
473 if (remove_from_lists)
474 target_remove_from_state_list(cmd);
475 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
476
477 complete(&cmd->transport_lun_stop_comp);
478 return 1;
479 }
480
481 if (remove_from_lists) {
482 target_remove_from_state_list(cmd);
483
484 /*
485 * Clear struct se_cmd->se_lun before the handoff to FE.
486 */
487 cmd->se_lun = NULL;
488 }
489
490 /*
491 * Determine if frontend context caller is requesting the stopping of
492 * this command for frontend exceptions.
493 */
494 if (cmd->transport_state & CMD_T_STOP) {
495 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
496 __func__, __LINE__,
497 cmd->se_tfo->get_task_tag(cmd));
498
499 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
500
501 complete(&cmd->t_transport_stop_comp);
502 return 1;
503 }
504
505 cmd->transport_state &= ~CMD_T_ACTIVE;
506 if (remove_from_lists) {
507 /*
508 * Some fabric modules like tcm_loop can release
509 * their internally allocated I/O reference now and
510 * struct se_cmd now.
511 *
512 * Fabric modules are expected to return '1' here if the
513 * se_cmd being passed is released at this point,
514 * or zero if not being released.
515 */
516 if (cmd->se_tfo->check_stop_free != NULL) {
517 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
518 return cmd->se_tfo->check_stop_free(cmd);
519 }
520 }
521
522 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
523 return 0;
524 }
525
526 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
527 {
528 return transport_cmd_check_stop(cmd, true);
529 }
530
531 static void transport_lun_remove_cmd(struct se_cmd *cmd)
532 {
533 struct se_lun *lun = cmd->se_lun;
534 unsigned long flags;
535
536 if (!lun)
537 return;
538
539 spin_lock_irqsave(&cmd->t_state_lock, flags);
540 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
541 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
542 target_remove_from_state_list(cmd);
543 }
544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
545
546 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
547 if (!list_empty(&cmd->se_lun_node))
548 list_del_init(&cmd->se_lun_node);
549 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
550 }
551
552 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
553 {
554 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
555 transport_lun_remove_cmd(cmd);
556
557 if (transport_cmd_check_stop_to_fabric(cmd))
558 return;
559 if (remove)
560 transport_put_cmd(cmd);
561 }
562
563 static void target_complete_failure_work(struct work_struct *work)
564 {
565 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
566
567 transport_generic_request_failure(cmd);
568 }
569
570 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
571 {
572 struct se_device *dev = cmd->se_dev;
573 int success = scsi_status == GOOD;
574 unsigned long flags;
575
576 cmd->scsi_status = scsi_status;
577
578
579 spin_lock_irqsave(&cmd->t_state_lock, flags);
580 cmd->transport_state &= ~CMD_T_BUSY;
581
582 if (dev && dev->transport->transport_complete) {
583 if (dev->transport->transport_complete(cmd,
584 cmd->t_data_sg) != 0) {
585 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
586 success = 1;
587 }
588 }
589
590 /*
591 * See if we are waiting to complete for an exception condition.
592 */
593 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
594 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
595 complete(&cmd->task_stop_comp);
596 return;
597 }
598
599 if (!success)
600 cmd->transport_state |= CMD_T_FAILED;
601
602 /*
603 * Check for case where an explict ABORT_TASK has been received
604 * and transport_wait_for_tasks() will be waiting for completion..
605 */
606 if (cmd->transport_state & CMD_T_ABORTED &&
607 cmd->transport_state & CMD_T_STOP) {
608 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
609 complete(&cmd->t_transport_stop_comp);
610 return;
611 } else if (cmd->transport_state & CMD_T_FAILED) {
612 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
613 INIT_WORK(&cmd->work, target_complete_failure_work);
614 } else {
615 INIT_WORK(&cmd->work, target_complete_ok_work);
616 }
617
618 cmd->t_state = TRANSPORT_COMPLETE;
619 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
620 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
621
622 queue_work(target_completion_wq, &cmd->work);
623 }
624 EXPORT_SYMBOL(target_complete_cmd);
625
626 static void target_add_to_state_list(struct se_cmd *cmd)
627 {
628 struct se_device *dev = cmd->se_dev;
629 unsigned long flags;
630
631 spin_lock_irqsave(&dev->execute_task_lock, flags);
632 if (!cmd->state_active) {
633 list_add_tail(&cmd->state_list, &dev->state_list);
634 cmd->state_active = true;
635 }
636 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
637 }
638
639 /*
640 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
641 */
642 static void transport_write_pending_qf(struct se_cmd *cmd);
643 static void transport_complete_qf(struct se_cmd *cmd);
644
645 static void target_qf_do_work(struct work_struct *work)
646 {
647 struct se_device *dev = container_of(work, struct se_device,
648 qf_work_queue);
649 LIST_HEAD(qf_cmd_list);
650 struct se_cmd *cmd, *cmd_tmp;
651
652 spin_lock_irq(&dev->qf_cmd_lock);
653 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
654 spin_unlock_irq(&dev->qf_cmd_lock);
655
656 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
657 list_del(&cmd->se_qf_node);
658 atomic_dec(&dev->dev_qf_count);
659 smp_mb__after_atomic_dec();
660
661 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
662 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
663 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
664 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
665 : "UNKNOWN");
666
667 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
668 transport_write_pending_qf(cmd);
669 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
670 transport_complete_qf(cmd);
671 }
672 }
673
674 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
675 {
676 switch (cmd->data_direction) {
677 case DMA_NONE:
678 return "NONE";
679 case DMA_FROM_DEVICE:
680 return "READ";
681 case DMA_TO_DEVICE:
682 return "WRITE";
683 case DMA_BIDIRECTIONAL:
684 return "BIDI";
685 default:
686 break;
687 }
688
689 return "UNKNOWN";
690 }
691
692 void transport_dump_dev_state(
693 struct se_device *dev,
694 char *b,
695 int *bl)
696 {
697 *bl += sprintf(b + *bl, "Status: ");
698 switch (dev->dev_status) {
699 case TRANSPORT_DEVICE_ACTIVATED:
700 *bl += sprintf(b + *bl, "ACTIVATED");
701 break;
702 case TRANSPORT_DEVICE_DEACTIVATED:
703 *bl += sprintf(b + *bl, "DEACTIVATED");
704 break;
705 case TRANSPORT_DEVICE_SHUTDOWN:
706 *bl += sprintf(b + *bl, "SHUTDOWN");
707 break;
708 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
709 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
710 *bl += sprintf(b + *bl, "OFFLINE");
711 break;
712 default:
713 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
714 break;
715 }
716
717 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
718 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
719 dev->se_sub_dev->se_dev_attrib.block_size,
720 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
721 *bl += sprintf(b + *bl, " ");
722 }
723
724 void transport_dump_vpd_proto_id(
725 struct t10_vpd *vpd,
726 unsigned char *p_buf,
727 int p_buf_len)
728 {
729 unsigned char buf[VPD_TMP_BUF_SIZE];
730 int len;
731
732 memset(buf, 0, VPD_TMP_BUF_SIZE);
733 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
734
735 switch (vpd->protocol_identifier) {
736 case 0x00:
737 sprintf(buf+len, "Fibre Channel\n");
738 break;
739 case 0x10:
740 sprintf(buf+len, "Parallel SCSI\n");
741 break;
742 case 0x20:
743 sprintf(buf+len, "SSA\n");
744 break;
745 case 0x30:
746 sprintf(buf+len, "IEEE 1394\n");
747 break;
748 case 0x40:
749 sprintf(buf+len, "SCSI Remote Direct Memory Access"
750 " Protocol\n");
751 break;
752 case 0x50:
753 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
754 break;
755 case 0x60:
756 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
757 break;
758 case 0x70:
759 sprintf(buf+len, "Automation/Drive Interface Transport"
760 " Protocol\n");
761 break;
762 case 0x80:
763 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
764 break;
765 default:
766 sprintf(buf+len, "Unknown 0x%02x\n",
767 vpd->protocol_identifier);
768 break;
769 }
770
771 if (p_buf)
772 strncpy(p_buf, buf, p_buf_len);
773 else
774 pr_debug("%s", buf);
775 }
776
777 void
778 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
779 {
780 /*
781 * Check if the Protocol Identifier Valid (PIV) bit is set..
782 *
783 * from spc3r23.pdf section 7.5.1
784 */
785 if (page_83[1] & 0x80) {
786 vpd->protocol_identifier = (page_83[0] & 0xf0);
787 vpd->protocol_identifier_set = 1;
788 transport_dump_vpd_proto_id(vpd, NULL, 0);
789 }
790 }
791 EXPORT_SYMBOL(transport_set_vpd_proto_id);
792
793 int transport_dump_vpd_assoc(
794 struct t10_vpd *vpd,
795 unsigned char *p_buf,
796 int p_buf_len)
797 {
798 unsigned char buf[VPD_TMP_BUF_SIZE];
799 int ret = 0;
800 int len;
801
802 memset(buf, 0, VPD_TMP_BUF_SIZE);
803 len = sprintf(buf, "T10 VPD Identifier Association: ");
804
805 switch (vpd->association) {
806 case 0x00:
807 sprintf(buf+len, "addressed logical unit\n");
808 break;
809 case 0x10:
810 sprintf(buf+len, "target port\n");
811 break;
812 case 0x20:
813 sprintf(buf+len, "SCSI target device\n");
814 break;
815 default:
816 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
817 ret = -EINVAL;
818 break;
819 }
820
821 if (p_buf)
822 strncpy(p_buf, buf, p_buf_len);
823 else
824 pr_debug("%s", buf);
825
826 return ret;
827 }
828
829 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
830 {
831 /*
832 * The VPD identification association..
833 *
834 * from spc3r23.pdf Section 7.6.3.1 Table 297
835 */
836 vpd->association = (page_83[1] & 0x30);
837 return transport_dump_vpd_assoc(vpd, NULL, 0);
838 }
839 EXPORT_SYMBOL(transport_set_vpd_assoc);
840
841 int transport_dump_vpd_ident_type(
842 struct t10_vpd *vpd,
843 unsigned char *p_buf,
844 int p_buf_len)
845 {
846 unsigned char buf[VPD_TMP_BUF_SIZE];
847 int ret = 0;
848 int len;
849
850 memset(buf, 0, VPD_TMP_BUF_SIZE);
851 len = sprintf(buf, "T10 VPD Identifier Type: ");
852
853 switch (vpd->device_identifier_type) {
854 case 0x00:
855 sprintf(buf+len, "Vendor specific\n");
856 break;
857 case 0x01:
858 sprintf(buf+len, "T10 Vendor ID based\n");
859 break;
860 case 0x02:
861 sprintf(buf+len, "EUI-64 based\n");
862 break;
863 case 0x03:
864 sprintf(buf+len, "NAA\n");
865 break;
866 case 0x04:
867 sprintf(buf+len, "Relative target port identifier\n");
868 break;
869 case 0x08:
870 sprintf(buf+len, "SCSI name string\n");
871 break;
872 default:
873 sprintf(buf+len, "Unsupported: 0x%02x\n",
874 vpd->device_identifier_type);
875 ret = -EINVAL;
876 break;
877 }
878
879 if (p_buf) {
880 if (p_buf_len < strlen(buf)+1)
881 return -EINVAL;
882 strncpy(p_buf, buf, p_buf_len);
883 } else {
884 pr_debug("%s", buf);
885 }
886
887 return ret;
888 }
889
890 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
891 {
892 /*
893 * The VPD identifier type..
894 *
895 * from spc3r23.pdf Section 7.6.3.1 Table 298
896 */
897 vpd->device_identifier_type = (page_83[1] & 0x0f);
898 return transport_dump_vpd_ident_type(vpd, NULL, 0);
899 }
900 EXPORT_SYMBOL(transport_set_vpd_ident_type);
901
902 int transport_dump_vpd_ident(
903 struct t10_vpd *vpd,
904 unsigned char *p_buf,
905 int p_buf_len)
906 {
907 unsigned char buf[VPD_TMP_BUF_SIZE];
908 int ret = 0;
909
910 memset(buf, 0, VPD_TMP_BUF_SIZE);
911
912 switch (vpd->device_identifier_code_set) {
913 case 0x01: /* Binary */
914 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
915 &vpd->device_identifier[0]);
916 break;
917 case 0x02: /* ASCII */
918 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
919 &vpd->device_identifier[0]);
920 break;
921 case 0x03: /* UTF-8 */
922 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
923 &vpd->device_identifier[0]);
924 break;
925 default:
926 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
927 " 0x%02x", vpd->device_identifier_code_set);
928 ret = -EINVAL;
929 break;
930 }
931
932 if (p_buf)
933 strncpy(p_buf, buf, p_buf_len);
934 else
935 pr_debug("%s", buf);
936
937 return ret;
938 }
939
940 int
941 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
942 {
943 static const char hex_str[] = "0123456789abcdef";
944 int j = 0, i = 4; /* offset to start of the identifer */
945
946 /*
947 * The VPD Code Set (encoding)
948 *
949 * from spc3r23.pdf Section 7.6.3.1 Table 296
950 */
951 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
952 switch (vpd->device_identifier_code_set) {
953 case 0x01: /* Binary */
954 vpd->device_identifier[j++] =
955 hex_str[vpd->device_identifier_type];
956 while (i < (4 + page_83[3])) {
957 vpd->device_identifier[j++] =
958 hex_str[(page_83[i] & 0xf0) >> 4];
959 vpd->device_identifier[j++] =
960 hex_str[page_83[i] & 0x0f];
961 i++;
962 }
963 break;
964 case 0x02: /* ASCII */
965 case 0x03: /* UTF-8 */
966 while (i < (4 + page_83[3]))
967 vpd->device_identifier[j++] = page_83[i++];
968 break;
969 default:
970 break;
971 }
972
973 return transport_dump_vpd_ident(vpd, NULL, 0);
974 }
975 EXPORT_SYMBOL(transport_set_vpd_ident);
976
977 static void core_setup_task_attr_emulation(struct se_device *dev)
978 {
979 /*
980 * If this device is from Target_Core_Mod/pSCSI, disable the
981 * SAM Task Attribute emulation.
982 *
983 * This is currently not available in upsream Linux/SCSI Target
984 * mode code, and is assumed to be disabled while using TCM/pSCSI.
985 */
986 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
987 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
988 return;
989 }
990
991 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
992 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
993 " device\n", dev->transport->name,
994 dev->transport->get_device_rev(dev));
995 }
996
997 static void scsi_dump_inquiry(struct se_device *dev)
998 {
999 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1000 char buf[17];
1001 int i, device_type;
1002 /*
1003 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1004 */
1005 for (i = 0; i < 8; i++)
1006 if (wwn->vendor[i] >= 0x20)
1007 buf[i] = wwn->vendor[i];
1008 else
1009 buf[i] = ' ';
1010 buf[i] = '\0';
1011 pr_debug(" Vendor: %s\n", buf);
1012
1013 for (i = 0; i < 16; i++)
1014 if (wwn->model[i] >= 0x20)
1015 buf[i] = wwn->model[i];
1016 else
1017 buf[i] = ' ';
1018 buf[i] = '\0';
1019 pr_debug(" Model: %s\n", buf);
1020
1021 for (i = 0; i < 4; i++)
1022 if (wwn->revision[i] >= 0x20)
1023 buf[i] = wwn->revision[i];
1024 else
1025 buf[i] = ' ';
1026 buf[i] = '\0';
1027 pr_debug(" Revision: %s\n", buf);
1028
1029 device_type = dev->transport->get_device_type(dev);
1030 pr_debug(" Type: %s ", scsi_device_type(device_type));
1031 pr_debug(" ANSI SCSI revision: %02x\n",
1032 dev->transport->get_device_rev(dev));
1033 }
1034
1035 struct se_device *transport_add_device_to_core_hba(
1036 struct se_hba *hba,
1037 struct se_subsystem_api *transport,
1038 struct se_subsystem_dev *se_dev,
1039 u32 device_flags,
1040 void *transport_dev,
1041 struct se_dev_limits *dev_limits,
1042 const char *inquiry_prod,
1043 const char *inquiry_rev)
1044 {
1045 int force_pt;
1046 struct se_device *dev;
1047
1048 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1049 if (!dev) {
1050 pr_err("Unable to allocate memory for se_dev_t\n");
1051 return NULL;
1052 }
1053
1054 dev->dev_flags = device_flags;
1055 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1056 dev->dev_ptr = transport_dev;
1057 dev->se_hba = hba;
1058 dev->se_sub_dev = se_dev;
1059 dev->transport = transport;
1060 INIT_LIST_HEAD(&dev->dev_list);
1061 INIT_LIST_HEAD(&dev->dev_sep_list);
1062 INIT_LIST_HEAD(&dev->dev_tmr_list);
1063 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1064 INIT_LIST_HEAD(&dev->state_list);
1065 INIT_LIST_HEAD(&dev->qf_cmd_list);
1066 spin_lock_init(&dev->execute_task_lock);
1067 spin_lock_init(&dev->delayed_cmd_lock);
1068 spin_lock_init(&dev->dev_reservation_lock);
1069 spin_lock_init(&dev->dev_status_lock);
1070 spin_lock_init(&dev->se_port_lock);
1071 spin_lock_init(&dev->se_tmr_lock);
1072 spin_lock_init(&dev->qf_cmd_lock);
1073 atomic_set(&dev->dev_ordered_id, 0);
1074
1075 se_dev_set_default_attribs(dev, dev_limits);
1076
1077 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1078 dev->creation_time = get_jiffies_64();
1079 spin_lock_init(&dev->stats_lock);
1080
1081 spin_lock(&hba->device_lock);
1082 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1083 hba->dev_count++;
1084 spin_unlock(&hba->device_lock);
1085 /*
1086 * Setup the SAM Task Attribute emulation for struct se_device
1087 */
1088 core_setup_task_attr_emulation(dev);
1089 /*
1090 * Force PR and ALUA passthrough emulation with internal object use.
1091 */
1092 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1093 /*
1094 * Setup the Reservations infrastructure for struct se_device
1095 */
1096 core_setup_reservations(dev, force_pt);
1097 /*
1098 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1099 */
1100 if (core_setup_alua(dev, force_pt) < 0)
1101 goto out;
1102
1103 /*
1104 * Startup the struct se_device processing thread
1105 */
1106 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1107 dev->transport->name);
1108 if (!dev->tmr_wq) {
1109 pr_err("Unable to create tmr workqueue for %s\n",
1110 dev->transport->name);
1111 goto out;
1112 }
1113 /*
1114 * Setup work_queue for QUEUE_FULL
1115 */
1116 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1117 /*
1118 * Preload the initial INQUIRY const values if we are doing
1119 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1120 * passthrough because this is being provided by the backend LLD.
1121 * This is required so that transport_get_inquiry() copies these
1122 * originals once back into DEV_T10_WWN(dev) for the virtual device
1123 * setup.
1124 */
1125 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1126 if (!inquiry_prod || !inquiry_rev) {
1127 pr_err("All non TCM/pSCSI plugins require"
1128 " INQUIRY consts\n");
1129 goto out;
1130 }
1131
1132 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1133 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1134 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1135 }
1136 scsi_dump_inquiry(dev);
1137
1138 return dev;
1139 out:
1140 destroy_workqueue(dev->tmr_wq);
1141
1142 spin_lock(&hba->device_lock);
1143 list_del(&dev->dev_list);
1144 hba->dev_count--;
1145 spin_unlock(&hba->device_lock);
1146
1147 se_release_vpd_for_dev(dev);
1148
1149 kfree(dev);
1150
1151 return NULL;
1152 }
1153 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1154
1155 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1156 {
1157 struct se_device *dev = cmd->se_dev;
1158
1159 if (cmd->unknown_data_length) {
1160 cmd->data_length = size;
1161 } else if (size != cmd->data_length) {
1162 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1163 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1164 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1165 cmd->data_length, size, cmd->t_task_cdb[0]);
1166
1167 cmd->cmd_spdtl = size;
1168
1169 if (cmd->data_direction == DMA_TO_DEVICE) {
1170 pr_err("Rejecting underflow/overflow"
1171 " WRITE data\n");
1172 goto out_invalid_cdb_field;
1173 }
1174 /*
1175 * Reject READ_* or WRITE_* with overflow/underflow for
1176 * type SCF_SCSI_DATA_CDB.
1177 */
1178 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1179 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1180 " CDB on non 512-byte sector setup subsystem"
1181 " plugin: %s\n", dev->transport->name);
1182 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1183 goto out_invalid_cdb_field;
1184 }
1185
1186 if (size > cmd->data_length) {
1187 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1188 cmd->residual_count = (size - cmd->data_length);
1189 } else {
1190 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1191 cmd->residual_count = (cmd->data_length - size);
1192 }
1193 cmd->data_length = size;
1194 }
1195
1196 return 0;
1197
1198 out_invalid_cdb_field:
1199 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1200 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1201 return -EINVAL;
1202 }
1203
1204 /*
1205 * Used by fabric modules containing a local struct se_cmd within their
1206 * fabric dependent per I/O descriptor.
1207 */
1208 void transport_init_se_cmd(
1209 struct se_cmd *cmd,
1210 struct target_core_fabric_ops *tfo,
1211 struct se_session *se_sess,
1212 u32 data_length,
1213 int data_direction,
1214 int task_attr,
1215 unsigned char *sense_buffer)
1216 {
1217 INIT_LIST_HEAD(&cmd->se_lun_node);
1218 INIT_LIST_HEAD(&cmd->se_delayed_node);
1219 INIT_LIST_HEAD(&cmd->se_qf_node);
1220 INIT_LIST_HEAD(&cmd->se_cmd_list);
1221 INIT_LIST_HEAD(&cmd->state_list);
1222 init_completion(&cmd->transport_lun_fe_stop_comp);
1223 init_completion(&cmd->transport_lun_stop_comp);
1224 init_completion(&cmd->t_transport_stop_comp);
1225 init_completion(&cmd->cmd_wait_comp);
1226 init_completion(&cmd->task_stop_comp);
1227 spin_lock_init(&cmd->t_state_lock);
1228 cmd->transport_state = CMD_T_DEV_ACTIVE;
1229
1230 cmd->se_tfo = tfo;
1231 cmd->se_sess = se_sess;
1232 cmd->data_length = data_length;
1233 cmd->data_direction = data_direction;
1234 cmd->sam_task_attr = task_attr;
1235 cmd->sense_buffer = sense_buffer;
1236
1237 cmd->state_active = false;
1238 }
1239 EXPORT_SYMBOL(transport_init_se_cmd);
1240
1241 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1242 {
1243 /*
1244 * Check if SAM Task Attribute emulation is enabled for this
1245 * struct se_device storage object
1246 */
1247 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1248 return 0;
1249
1250 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1251 pr_debug("SAM Task Attribute ACA"
1252 " emulation is not supported\n");
1253 return -EINVAL;
1254 }
1255 /*
1256 * Used to determine when ORDERED commands should go from
1257 * Dormant to Active status.
1258 */
1259 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1260 smp_mb__after_atomic_inc();
1261 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1262 cmd->se_ordered_id, cmd->sam_task_attr,
1263 cmd->se_dev->transport->name);
1264 return 0;
1265 }
1266
1267 /* target_setup_cmd_from_cdb():
1268 *
1269 * Called from fabric RX Thread.
1270 */
1271 int target_setup_cmd_from_cdb(
1272 struct se_cmd *cmd,
1273 unsigned char *cdb)
1274 {
1275 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1276 u32 pr_reg_type = 0;
1277 u8 alua_ascq = 0;
1278 unsigned long flags;
1279 int ret;
1280
1281 /*
1282 * Ensure that the received CDB is less than the max (252 + 8) bytes
1283 * for VARIABLE_LENGTH_CMD
1284 */
1285 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1286 pr_err("Received SCSI CDB with command_size: %d that"
1287 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1288 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1289 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1290 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1291 return -EINVAL;
1292 }
1293 /*
1294 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1295 * allocate the additional extended CDB buffer now.. Otherwise
1296 * setup the pointer from __t_task_cdb to t_task_cdb.
1297 */
1298 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1299 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1300 GFP_KERNEL);
1301 if (!cmd->t_task_cdb) {
1302 pr_err("Unable to allocate cmd->t_task_cdb"
1303 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1304 scsi_command_size(cdb),
1305 (unsigned long)sizeof(cmd->__t_task_cdb));
1306 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1307 cmd->scsi_sense_reason =
1308 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1309 return -ENOMEM;
1310 }
1311 } else
1312 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1313 /*
1314 * Copy the original CDB into cmd->
1315 */
1316 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1317
1318 /*
1319 * Check for an existing UNIT ATTENTION condition
1320 */
1321 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1322 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1323 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1324 return -EINVAL;
1325 }
1326
1327 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1328 if (ret != 0) {
1329 /*
1330 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1331 * The ALUA additional sense code qualifier (ASCQ) is determined
1332 * by the ALUA primary or secondary access state..
1333 */
1334 if (ret > 0) {
1335 pr_debug("[%s]: ALUA TG Port not available, "
1336 "SenseKey: NOT_READY, ASC/ASCQ: "
1337 "0x04/0x%02x\n",
1338 cmd->se_tfo->get_fabric_name(), alua_ascq);
1339
1340 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1341 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1342 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1343 return -EINVAL;
1344 }
1345 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1346 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1347 return -EINVAL;
1348 }
1349
1350 /*
1351 * Check status for SPC-3 Persistent Reservations
1352 */
1353 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1354 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1355 cmd, cdb, pr_reg_type) != 0) {
1356 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1357 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1358 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1359 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1360 return -EBUSY;
1361 }
1362 /*
1363 * This means the CDB is allowed for the SCSI Initiator port
1364 * when said port is *NOT* holding the legacy SPC-2 or
1365 * SPC-3 Persistent Reservation.
1366 */
1367 }
1368
1369 ret = cmd->se_dev->transport->parse_cdb(cmd);
1370 if (ret < 0)
1371 return ret;
1372
1373 spin_lock_irqsave(&cmd->t_state_lock, flags);
1374 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1375 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1376
1377 /*
1378 * Check for SAM Task Attribute Emulation
1379 */
1380 if (transport_check_alloc_task_attr(cmd) < 0) {
1381 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1382 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1383 return -EINVAL;
1384 }
1385 spin_lock(&cmd->se_lun->lun_sep_lock);
1386 if (cmd->se_lun->lun_sep)
1387 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1388 spin_unlock(&cmd->se_lun->lun_sep_lock);
1389 return 0;
1390 }
1391 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1392
1393 /*
1394 * Used by fabric module frontends to queue tasks directly.
1395 * Many only be used from process context only
1396 */
1397 int transport_handle_cdb_direct(
1398 struct se_cmd *cmd)
1399 {
1400 int ret;
1401
1402 if (!cmd->se_lun) {
1403 dump_stack();
1404 pr_err("cmd->se_lun is NULL\n");
1405 return -EINVAL;
1406 }
1407 if (in_interrupt()) {
1408 dump_stack();
1409 pr_err("transport_generic_handle_cdb cannot be called"
1410 " from interrupt context\n");
1411 return -EINVAL;
1412 }
1413 /*
1414 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1415 * outstanding descriptors are handled correctly during shutdown via
1416 * transport_wait_for_tasks()
1417 *
1418 * Also, we don't take cmd->t_state_lock here as we only expect
1419 * this to be called for initial descriptor submission.
1420 */
1421 cmd->t_state = TRANSPORT_NEW_CMD;
1422 cmd->transport_state |= CMD_T_ACTIVE;
1423
1424 /*
1425 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1426 * so follow TRANSPORT_NEW_CMD processing thread context usage
1427 * and call transport_generic_request_failure() if necessary..
1428 */
1429 ret = transport_generic_new_cmd(cmd);
1430 if (ret < 0)
1431 transport_generic_request_failure(cmd);
1432
1433 return 0;
1434 }
1435 EXPORT_SYMBOL(transport_handle_cdb_direct);
1436
1437 /**
1438 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1439 *
1440 * @se_cmd: command descriptor to submit
1441 * @se_sess: associated se_sess for endpoint
1442 * @cdb: pointer to SCSI CDB
1443 * @sense: pointer to SCSI sense buffer
1444 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1445 * @data_length: fabric expected data transfer length
1446 * @task_addr: SAM task attribute
1447 * @data_dir: DMA data direction
1448 * @flags: flags for command submission from target_sc_flags_tables
1449 *
1450 * Returns non zero to signal active I/O shutdown failure. All other
1451 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1452 * but still return zero here.
1453 *
1454 * This may only be called from process context, and also currently
1455 * assumes internal allocation of fabric payload buffer by target-core.
1456 **/
1457 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1458 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1459 u32 data_length, int task_attr, int data_dir, int flags)
1460 {
1461 struct se_portal_group *se_tpg;
1462 int rc;
1463
1464 se_tpg = se_sess->se_tpg;
1465 BUG_ON(!se_tpg);
1466 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1467 BUG_ON(in_interrupt());
1468 /*
1469 * Initialize se_cmd for target operation. From this point
1470 * exceptions are handled by sending exception status via
1471 * target_core_fabric_ops->queue_status() callback
1472 */
1473 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1474 data_length, data_dir, task_attr, sense);
1475 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1476 se_cmd->unknown_data_length = 1;
1477 /*
1478 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1479 * se_sess->sess_cmd_list. A second kref_get here is necessary
1480 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1481 * kref_put() to happen during fabric packet acknowledgement.
1482 */
1483 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1484 if (rc)
1485 return rc;
1486 /*
1487 * Signal bidirectional data payloads to target-core
1488 */
1489 if (flags & TARGET_SCF_BIDI_OP)
1490 se_cmd->se_cmd_flags |= SCF_BIDI;
1491 /*
1492 * Locate se_lun pointer and attach it to struct se_cmd
1493 */
1494 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1495 transport_send_check_condition_and_sense(se_cmd,
1496 se_cmd->scsi_sense_reason, 0);
1497 target_put_sess_cmd(se_sess, se_cmd);
1498 return 0;
1499 }
1500
1501 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1502 if (rc != 0) {
1503 transport_generic_request_failure(se_cmd);
1504 return 0;
1505 }
1506
1507 /*
1508 * Check if we need to delay processing because of ALUA
1509 * Active/NonOptimized primary access state..
1510 */
1511 core_alua_check_nonop_delay(se_cmd);
1512
1513 transport_handle_cdb_direct(se_cmd);
1514 return 0;
1515 }
1516 EXPORT_SYMBOL(target_submit_cmd);
1517
1518 static void target_complete_tmr_failure(struct work_struct *work)
1519 {
1520 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1521
1522 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1523 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1524 transport_generic_free_cmd(se_cmd, 0);
1525 }
1526
1527 /**
1528 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1529 * for TMR CDBs
1530 *
1531 * @se_cmd: command descriptor to submit
1532 * @se_sess: associated se_sess for endpoint
1533 * @sense: pointer to SCSI sense buffer
1534 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1535 * @fabric_context: fabric context for TMR req
1536 * @tm_type: Type of TM request
1537 * @gfp: gfp type for caller
1538 * @tag: referenced task tag for TMR_ABORT_TASK
1539 * @flags: submit cmd flags
1540 *
1541 * Callable from all contexts.
1542 **/
1543
1544 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1545 unsigned char *sense, u32 unpacked_lun,
1546 void *fabric_tmr_ptr, unsigned char tm_type,
1547 gfp_t gfp, unsigned int tag, int flags)
1548 {
1549 struct se_portal_group *se_tpg;
1550 int ret;
1551
1552 se_tpg = se_sess->se_tpg;
1553 BUG_ON(!se_tpg);
1554
1555 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1556 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1557 /*
1558 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1559 * allocation failure.
1560 */
1561 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1562 if (ret < 0)
1563 return -ENOMEM;
1564
1565 if (tm_type == TMR_ABORT_TASK)
1566 se_cmd->se_tmr_req->ref_task_tag = tag;
1567
1568 /* See target_submit_cmd for commentary */
1569 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1570 if (ret) {
1571 core_tmr_release_req(se_cmd->se_tmr_req);
1572 return ret;
1573 }
1574
1575 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1576 if (ret) {
1577 /*
1578 * For callback during failure handling, push this work off
1579 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1580 */
1581 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1582 schedule_work(&se_cmd->work);
1583 return 0;
1584 }
1585 transport_generic_handle_tmr(se_cmd);
1586 return 0;
1587 }
1588 EXPORT_SYMBOL(target_submit_tmr);
1589
1590 /*
1591 * If the cmd is active, request it to be stopped and sleep until it
1592 * has completed.
1593 */
1594 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1595 {
1596 bool was_active = false;
1597
1598 if (cmd->transport_state & CMD_T_BUSY) {
1599 cmd->transport_state |= CMD_T_REQUEST_STOP;
1600 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1601
1602 pr_debug("cmd %p waiting to complete\n", cmd);
1603 wait_for_completion(&cmd->task_stop_comp);
1604 pr_debug("cmd %p stopped successfully\n", cmd);
1605
1606 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1607 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1608 cmd->transport_state &= ~CMD_T_BUSY;
1609 was_active = true;
1610 }
1611
1612 return was_active;
1613 }
1614
1615 /*
1616 * Handle SAM-esque emulation for generic transport request failures.
1617 */
1618 void transport_generic_request_failure(struct se_cmd *cmd)
1619 {
1620 int ret = 0;
1621
1622 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1623 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1624 cmd->t_task_cdb[0]);
1625 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1626 cmd->se_tfo->get_cmd_state(cmd),
1627 cmd->t_state, cmd->scsi_sense_reason);
1628 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1629 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1630 (cmd->transport_state & CMD_T_STOP) != 0,
1631 (cmd->transport_state & CMD_T_SENT) != 0);
1632
1633 /*
1634 * For SAM Task Attribute emulation for failed struct se_cmd
1635 */
1636 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1637 transport_complete_task_attr(cmd);
1638
1639 switch (cmd->scsi_sense_reason) {
1640 case TCM_NON_EXISTENT_LUN:
1641 case TCM_UNSUPPORTED_SCSI_OPCODE:
1642 case TCM_INVALID_CDB_FIELD:
1643 case TCM_INVALID_PARAMETER_LIST:
1644 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1645 case TCM_UNKNOWN_MODE_PAGE:
1646 case TCM_WRITE_PROTECTED:
1647 case TCM_ADDRESS_OUT_OF_RANGE:
1648 case TCM_CHECK_CONDITION_ABORT_CMD:
1649 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1650 case TCM_CHECK_CONDITION_NOT_READY:
1651 break;
1652 case TCM_RESERVATION_CONFLICT:
1653 /*
1654 * No SENSE Data payload for this case, set SCSI Status
1655 * and queue the response to $FABRIC_MOD.
1656 *
1657 * Uses linux/include/scsi/scsi.h SAM status codes defs
1658 */
1659 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1660 /*
1661 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1662 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1663 * CONFLICT STATUS.
1664 *
1665 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1666 */
1667 if (cmd->se_sess &&
1668 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1669 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1670 cmd->orig_fe_lun, 0x2C,
1671 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1672
1673 ret = cmd->se_tfo->queue_status(cmd);
1674 if (ret == -EAGAIN || ret == -ENOMEM)
1675 goto queue_full;
1676 goto check_stop;
1677 default:
1678 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1679 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1680 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1681 break;
1682 }
1683
1684 ret = transport_send_check_condition_and_sense(cmd,
1685 cmd->scsi_sense_reason, 0);
1686 if (ret == -EAGAIN || ret == -ENOMEM)
1687 goto queue_full;
1688
1689 check_stop:
1690 transport_lun_remove_cmd(cmd);
1691 if (!transport_cmd_check_stop_to_fabric(cmd))
1692 ;
1693 return;
1694
1695 queue_full:
1696 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1697 transport_handle_queue_full(cmd, cmd->se_dev);
1698 }
1699 EXPORT_SYMBOL(transport_generic_request_failure);
1700
1701 static void __target_execute_cmd(struct se_cmd *cmd)
1702 {
1703 int error = 0;
1704
1705 spin_lock_irq(&cmd->t_state_lock);
1706 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1707 spin_unlock_irq(&cmd->t_state_lock);
1708
1709 if (cmd->execute_cmd)
1710 error = cmd->execute_cmd(cmd);
1711
1712 if (error) {
1713 spin_lock_irq(&cmd->t_state_lock);
1714 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1715 spin_unlock_irq(&cmd->t_state_lock);
1716
1717 transport_generic_request_failure(cmd);
1718 }
1719 }
1720
1721 void target_execute_cmd(struct se_cmd *cmd)
1722 {
1723 struct se_device *dev = cmd->se_dev;
1724
1725 /*
1726 * If the received CDB has aleady been aborted stop processing it here.
1727 */
1728 if (transport_check_aborted_status(cmd, 1))
1729 return;
1730
1731 /*
1732 * Determine if IOCTL context caller in requesting the stopping of this
1733 * command for LUN shutdown purposes.
1734 */
1735 spin_lock_irq(&cmd->t_state_lock);
1736 if (cmd->transport_state & CMD_T_LUN_STOP) {
1737 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1738 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1739
1740 cmd->transport_state &= ~CMD_T_ACTIVE;
1741 spin_unlock_irq(&cmd->t_state_lock);
1742 complete(&cmd->transport_lun_stop_comp);
1743 return;
1744 }
1745 /*
1746 * Determine if frontend context caller is requesting the stopping of
1747 * this command for frontend exceptions.
1748 */
1749 if (cmd->transport_state & CMD_T_STOP) {
1750 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1751 __func__, __LINE__,
1752 cmd->se_tfo->get_task_tag(cmd));
1753
1754 spin_unlock_irq(&cmd->t_state_lock);
1755 complete(&cmd->t_transport_stop_comp);
1756 return;
1757 }
1758
1759 cmd->t_state = TRANSPORT_PROCESSING;
1760 spin_unlock_irq(&cmd->t_state_lock);
1761
1762 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1763 goto execute;
1764
1765 /*
1766 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1767 * to allow the passed struct se_cmd list of tasks to the front of the list.
1768 */
1769 switch (cmd->sam_task_attr) {
1770 case MSG_HEAD_TAG:
1771 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1772 "se_ordered_id: %u\n",
1773 cmd->t_task_cdb[0], cmd->se_ordered_id);
1774 goto execute;
1775 case MSG_ORDERED_TAG:
1776 atomic_inc(&dev->dev_ordered_sync);
1777 smp_mb__after_atomic_inc();
1778
1779 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1780 " se_ordered_id: %u\n",
1781 cmd->t_task_cdb[0], cmd->se_ordered_id);
1782
1783 /*
1784 * Execute an ORDERED command if no other older commands
1785 * exist that need to be completed first.
1786 */
1787 if (!atomic_read(&dev->simple_cmds))
1788 goto execute;
1789 break;
1790 default:
1791 /*
1792 * For SIMPLE and UNTAGGED Task Attribute commands
1793 */
1794 atomic_inc(&dev->simple_cmds);
1795 smp_mb__after_atomic_inc();
1796 break;
1797 }
1798
1799 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1800 spin_lock(&dev->delayed_cmd_lock);
1801 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1802 spin_unlock(&dev->delayed_cmd_lock);
1803
1804 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1805 " delayed CMD list, se_ordered_id: %u\n",
1806 cmd->t_task_cdb[0], cmd->sam_task_attr,
1807 cmd->se_ordered_id);
1808 return;
1809 }
1810
1811 execute:
1812 /*
1813 * Otherwise, no ORDERED task attributes exist..
1814 */
1815 __target_execute_cmd(cmd);
1816 }
1817 EXPORT_SYMBOL(target_execute_cmd);
1818
1819 /*
1820 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1821 */
1822 static int transport_get_sense_data(struct se_cmd *cmd)
1823 {
1824 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
1825 struct se_device *dev = cmd->se_dev;
1826 unsigned long flags;
1827 u32 offset = 0;
1828
1829 WARN_ON(!cmd->se_lun);
1830
1831 if (!dev)
1832 return 0;
1833
1834 spin_lock_irqsave(&cmd->t_state_lock, flags);
1835 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
1836 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1837 return 0;
1838 }
1839
1840 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
1841 goto out;
1842
1843 if (!dev->transport->get_sense_buffer) {
1844 pr_err("dev->transport->get_sense_buffer is NULL\n");
1845 goto out;
1846 }
1847
1848 sense_buffer = dev->transport->get_sense_buffer(cmd);
1849 if (!sense_buffer) {
1850 pr_err("ITT 0x%08x cmd %p: Unable to locate"
1851 " sense buffer for task with sense\n",
1852 cmd->se_tfo->get_task_tag(cmd), cmd);
1853 goto out;
1854 }
1855
1856 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1857
1858 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
1859
1860 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
1861
1862 /* Automatically padded */
1863 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
1864
1865 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
1866 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
1867 return 0;
1868
1869 out:
1870 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1871 return -1;
1872 }
1873
1874 /*
1875 * Process all commands up to the last received ORDERED task attribute which
1876 * requires another blocking boundary
1877 */
1878 static void target_restart_delayed_cmds(struct se_device *dev)
1879 {
1880 for (;;) {
1881 struct se_cmd *cmd;
1882
1883 spin_lock(&dev->delayed_cmd_lock);
1884 if (list_empty(&dev->delayed_cmd_list)) {
1885 spin_unlock(&dev->delayed_cmd_lock);
1886 break;
1887 }
1888
1889 cmd = list_entry(dev->delayed_cmd_list.next,
1890 struct se_cmd, se_delayed_node);
1891 list_del(&cmd->se_delayed_node);
1892 spin_unlock(&dev->delayed_cmd_lock);
1893
1894 __target_execute_cmd(cmd);
1895
1896 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1897 break;
1898 }
1899 }
1900
1901 /*
1902 * Called from I/O completion to determine which dormant/delayed
1903 * and ordered cmds need to have their tasks added to the execution queue.
1904 */
1905 static void transport_complete_task_attr(struct se_cmd *cmd)
1906 {
1907 struct se_device *dev = cmd->se_dev;
1908
1909 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1910 atomic_dec(&dev->simple_cmds);
1911 smp_mb__after_atomic_dec();
1912 dev->dev_cur_ordered_id++;
1913 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1914 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1915 cmd->se_ordered_id);
1916 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1917 dev->dev_cur_ordered_id++;
1918 pr_debug("Incremented dev_cur_ordered_id: %u for"
1919 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1920 cmd->se_ordered_id);
1921 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1922 atomic_dec(&dev->dev_ordered_sync);
1923 smp_mb__after_atomic_dec();
1924
1925 dev->dev_cur_ordered_id++;
1926 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1927 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1928 }
1929
1930 target_restart_delayed_cmds(dev);
1931 }
1932
1933 static void transport_complete_qf(struct se_cmd *cmd)
1934 {
1935 int ret = 0;
1936
1937 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1938 transport_complete_task_attr(cmd);
1939
1940 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1941 ret = cmd->se_tfo->queue_status(cmd);
1942 if (ret)
1943 goto out;
1944 }
1945
1946 switch (cmd->data_direction) {
1947 case DMA_FROM_DEVICE:
1948 ret = cmd->se_tfo->queue_data_in(cmd);
1949 break;
1950 case DMA_TO_DEVICE:
1951 if (cmd->t_bidi_data_sg) {
1952 ret = cmd->se_tfo->queue_data_in(cmd);
1953 if (ret < 0)
1954 break;
1955 }
1956 /* Fall through for DMA_TO_DEVICE */
1957 case DMA_NONE:
1958 ret = cmd->se_tfo->queue_status(cmd);
1959 break;
1960 default:
1961 break;
1962 }
1963
1964 out:
1965 if (ret < 0) {
1966 transport_handle_queue_full(cmd, cmd->se_dev);
1967 return;
1968 }
1969 transport_lun_remove_cmd(cmd);
1970 transport_cmd_check_stop_to_fabric(cmd);
1971 }
1972
1973 static void transport_handle_queue_full(
1974 struct se_cmd *cmd,
1975 struct se_device *dev)
1976 {
1977 spin_lock_irq(&dev->qf_cmd_lock);
1978 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1979 atomic_inc(&dev->dev_qf_count);
1980 smp_mb__after_atomic_inc();
1981 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1982
1983 schedule_work(&cmd->se_dev->qf_work_queue);
1984 }
1985
1986 static void target_complete_ok_work(struct work_struct *work)
1987 {
1988 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1989 int reason = 0, ret;
1990
1991 /*
1992 * Check if we need to move delayed/dormant tasks from cmds on the
1993 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1994 * Attribute.
1995 */
1996 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1997 transport_complete_task_attr(cmd);
1998 /*
1999 * Check to schedule QUEUE_FULL work, or execute an existing
2000 * cmd->transport_qf_callback()
2001 */
2002 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2003 schedule_work(&cmd->se_dev->qf_work_queue);
2004
2005 /*
2006 * Check if we need to retrieve a sense buffer from
2007 * the struct se_cmd in question.
2008 */
2009 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2010 if (transport_get_sense_data(cmd) < 0)
2011 reason = TCM_NON_EXISTENT_LUN;
2012
2013 if (cmd->scsi_status) {
2014 ret = transport_send_check_condition_and_sense(
2015 cmd, reason, 1);
2016 if (ret == -EAGAIN || ret == -ENOMEM)
2017 goto queue_full;
2018
2019 transport_lun_remove_cmd(cmd);
2020 transport_cmd_check_stop_to_fabric(cmd);
2021 return;
2022 }
2023 }
2024 /*
2025 * Check for a callback, used by amongst other things
2026 * XDWRITE_READ_10 emulation.
2027 */
2028 if (cmd->transport_complete_callback)
2029 cmd->transport_complete_callback(cmd);
2030
2031 switch (cmd->data_direction) {
2032 case DMA_FROM_DEVICE:
2033 spin_lock(&cmd->se_lun->lun_sep_lock);
2034 if (cmd->se_lun->lun_sep) {
2035 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2036 cmd->data_length;
2037 }
2038 spin_unlock(&cmd->se_lun->lun_sep_lock);
2039
2040 ret = cmd->se_tfo->queue_data_in(cmd);
2041 if (ret == -EAGAIN || ret == -ENOMEM)
2042 goto queue_full;
2043 break;
2044 case DMA_TO_DEVICE:
2045 spin_lock(&cmd->se_lun->lun_sep_lock);
2046 if (cmd->se_lun->lun_sep) {
2047 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2048 cmd->data_length;
2049 }
2050 spin_unlock(&cmd->se_lun->lun_sep_lock);
2051 /*
2052 * Check if we need to send READ payload for BIDI-COMMAND
2053 */
2054 if (cmd->t_bidi_data_sg) {
2055 spin_lock(&cmd->se_lun->lun_sep_lock);
2056 if (cmd->se_lun->lun_sep) {
2057 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2058 cmd->data_length;
2059 }
2060 spin_unlock(&cmd->se_lun->lun_sep_lock);
2061 ret = cmd->se_tfo->queue_data_in(cmd);
2062 if (ret == -EAGAIN || ret == -ENOMEM)
2063 goto queue_full;
2064 break;
2065 }
2066 /* Fall through for DMA_TO_DEVICE */
2067 case DMA_NONE:
2068 ret = cmd->se_tfo->queue_status(cmd);
2069 if (ret == -EAGAIN || ret == -ENOMEM)
2070 goto queue_full;
2071 break;
2072 default:
2073 break;
2074 }
2075
2076 transport_lun_remove_cmd(cmd);
2077 transport_cmd_check_stop_to_fabric(cmd);
2078 return;
2079
2080 queue_full:
2081 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2082 " data_direction: %d\n", cmd, cmd->data_direction);
2083 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2084 transport_handle_queue_full(cmd, cmd->se_dev);
2085 }
2086
2087 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2088 {
2089 struct scatterlist *sg;
2090 int count;
2091
2092 for_each_sg(sgl, sg, nents, count)
2093 __free_page(sg_page(sg));
2094
2095 kfree(sgl);
2096 }
2097
2098 static inline void transport_free_pages(struct se_cmd *cmd)
2099 {
2100 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2101 return;
2102
2103 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2104 cmd->t_data_sg = NULL;
2105 cmd->t_data_nents = 0;
2106
2107 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2108 cmd->t_bidi_data_sg = NULL;
2109 cmd->t_bidi_data_nents = 0;
2110 }
2111
2112 /**
2113 * transport_release_cmd - free a command
2114 * @cmd: command to free
2115 *
2116 * This routine unconditionally frees a command, and reference counting
2117 * or list removal must be done in the caller.
2118 */
2119 static void transport_release_cmd(struct se_cmd *cmd)
2120 {
2121 BUG_ON(!cmd->se_tfo);
2122
2123 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2124 core_tmr_release_req(cmd->se_tmr_req);
2125 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2126 kfree(cmd->t_task_cdb);
2127 /*
2128 * If this cmd has been setup with target_get_sess_cmd(), drop
2129 * the kref and call ->release_cmd() in kref callback.
2130 */
2131 if (cmd->check_release != 0) {
2132 target_put_sess_cmd(cmd->se_sess, cmd);
2133 return;
2134 }
2135 cmd->se_tfo->release_cmd(cmd);
2136 }
2137
2138 /**
2139 * transport_put_cmd - release a reference to a command
2140 * @cmd: command to release
2141 *
2142 * This routine releases our reference to the command and frees it if possible.
2143 */
2144 static void transport_put_cmd(struct se_cmd *cmd)
2145 {
2146 unsigned long flags;
2147
2148 spin_lock_irqsave(&cmd->t_state_lock, flags);
2149 if (atomic_read(&cmd->t_fe_count)) {
2150 if (!atomic_dec_and_test(&cmd->t_fe_count))
2151 goto out_busy;
2152 }
2153
2154 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2155 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2156 target_remove_from_state_list(cmd);
2157 }
2158 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2159
2160 transport_free_pages(cmd);
2161 transport_release_cmd(cmd);
2162 return;
2163 out_busy:
2164 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2165 }
2166
2167 /*
2168 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2169 * allocating in the core.
2170 * @cmd: Associated se_cmd descriptor
2171 * @mem: SGL style memory for TCM WRITE / READ
2172 * @sg_mem_num: Number of SGL elements
2173 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2174 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2175 *
2176 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2177 * of parameters.
2178 */
2179 int transport_generic_map_mem_to_cmd(
2180 struct se_cmd *cmd,
2181 struct scatterlist *sgl,
2182 u32 sgl_count,
2183 struct scatterlist *sgl_bidi,
2184 u32 sgl_bidi_count)
2185 {
2186 if (!sgl || !sgl_count)
2187 return 0;
2188
2189 /*
2190 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2191 * scatterlists already have been set to follow what the fabric
2192 * passes for the original expected data transfer length.
2193 */
2194 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2195 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2196 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2197 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2198 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2199 return -EINVAL;
2200 }
2201
2202 cmd->t_data_sg = sgl;
2203 cmd->t_data_nents = sgl_count;
2204
2205 if (sgl_bidi && sgl_bidi_count) {
2206 cmd->t_bidi_data_sg = sgl_bidi;
2207 cmd->t_bidi_data_nents = sgl_bidi_count;
2208 }
2209 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2210 return 0;
2211 }
2212 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2213
2214 void *transport_kmap_data_sg(struct se_cmd *cmd)
2215 {
2216 struct scatterlist *sg = cmd->t_data_sg;
2217 struct page **pages;
2218 int i;
2219
2220 BUG_ON(!sg);
2221 /*
2222 * We need to take into account a possible offset here for fabrics like
2223 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2224 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2225 */
2226 if (!cmd->t_data_nents)
2227 return NULL;
2228 else if (cmd->t_data_nents == 1)
2229 return kmap(sg_page(sg)) + sg->offset;
2230
2231 /* >1 page. use vmap */
2232 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2233 if (!pages)
2234 return NULL;
2235
2236 /* convert sg[] to pages[] */
2237 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2238 pages[i] = sg_page(sg);
2239 }
2240
2241 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2242 kfree(pages);
2243 if (!cmd->t_data_vmap)
2244 return NULL;
2245
2246 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2247 }
2248 EXPORT_SYMBOL(transport_kmap_data_sg);
2249
2250 void transport_kunmap_data_sg(struct se_cmd *cmd)
2251 {
2252 if (!cmd->t_data_nents) {
2253 return;
2254 } else if (cmd->t_data_nents == 1) {
2255 kunmap(sg_page(cmd->t_data_sg));
2256 return;
2257 }
2258
2259 vunmap(cmd->t_data_vmap);
2260 cmd->t_data_vmap = NULL;
2261 }
2262 EXPORT_SYMBOL(transport_kunmap_data_sg);
2263
2264 static int
2265 transport_generic_get_mem(struct se_cmd *cmd)
2266 {
2267 u32 length = cmd->data_length;
2268 unsigned int nents;
2269 struct page *page;
2270 gfp_t zero_flag;
2271 int i = 0;
2272
2273 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2274 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2275 if (!cmd->t_data_sg)
2276 return -ENOMEM;
2277
2278 cmd->t_data_nents = nents;
2279 sg_init_table(cmd->t_data_sg, nents);
2280
2281 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2282
2283 while (length) {
2284 u32 page_len = min_t(u32, length, PAGE_SIZE);
2285 page = alloc_page(GFP_KERNEL | zero_flag);
2286 if (!page)
2287 goto out;
2288
2289 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2290 length -= page_len;
2291 i++;
2292 }
2293 return 0;
2294
2295 out:
2296 while (i >= 0) {
2297 __free_page(sg_page(&cmd->t_data_sg[i]));
2298 i--;
2299 }
2300 kfree(cmd->t_data_sg);
2301 cmd->t_data_sg = NULL;
2302 return -ENOMEM;
2303 }
2304
2305 /*
2306 * Allocate any required resources to execute the command. For writes we
2307 * might not have the payload yet, so notify the fabric via a call to
2308 * ->write_pending instead. Otherwise place it on the execution queue.
2309 */
2310 int transport_generic_new_cmd(struct se_cmd *cmd)
2311 {
2312 int ret = 0;
2313
2314 /*
2315 * Determine is the TCM fabric module has already allocated physical
2316 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2317 * beforehand.
2318 */
2319 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2320 cmd->data_length) {
2321 ret = transport_generic_get_mem(cmd);
2322 if (ret < 0)
2323 goto out_fail;
2324 }
2325
2326 /* Workaround for handling zero-length control CDBs */
2327 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) {
2328 spin_lock_irq(&cmd->t_state_lock);
2329 cmd->t_state = TRANSPORT_COMPLETE;
2330 cmd->transport_state |= CMD_T_ACTIVE;
2331 spin_unlock_irq(&cmd->t_state_lock);
2332
2333 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2334 u8 ua_asc = 0, ua_ascq = 0;
2335
2336 core_scsi3_ua_clear_for_request_sense(cmd,
2337 &ua_asc, &ua_ascq);
2338 }
2339
2340 INIT_WORK(&cmd->work, target_complete_ok_work);
2341 queue_work(target_completion_wq, &cmd->work);
2342 return 0;
2343 }
2344
2345 atomic_inc(&cmd->t_fe_count);
2346
2347 /*
2348 * If this command is not a write we can execute it right here,
2349 * for write buffers we need to notify the fabric driver first
2350 * and let it call back once the write buffers are ready.
2351 */
2352 target_add_to_state_list(cmd);
2353 if (cmd->data_direction != DMA_TO_DEVICE) {
2354 target_execute_cmd(cmd);
2355 return 0;
2356 }
2357
2358 spin_lock_irq(&cmd->t_state_lock);
2359 cmd->t_state = TRANSPORT_WRITE_PENDING;
2360 spin_unlock_irq(&cmd->t_state_lock);
2361
2362 transport_cmd_check_stop(cmd, false);
2363
2364 ret = cmd->se_tfo->write_pending(cmd);
2365 if (ret == -EAGAIN || ret == -ENOMEM)
2366 goto queue_full;
2367
2368 if (ret < 0)
2369 return ret;
2370 return 1;
2371
2372 out_fail:
2373 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2374 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2375 return -EINVAL;
2376 queue_full:
2377 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2378 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2379 transport_handle_queue_full(cmd, cmd->se_dev);
2380 return 0;
2381 }
2382 EXPORT_SYMBOL(transport_generic_new_cmd);
2383
2384 static void transport_write_pending_qf(struct se_cmd *cmd)
2385 {
2386 int ret;
2387
2388 ret = cmd->se_tfo->write_pending(cmd);
2389 if (ret == -EAGAIN || ret == -ENOMEM) {
2390 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2391 cmd);
2392 transport_handle_queue_full(cmd, cmd->se_dev);
2393 }
2394 }
2395
2396 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2397 {
2398 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2399 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2400 transport_wait_for_tasks(cmd);
2401
2402 transport_release_cmd(cmd);
2403 } else {
2404 if (wait_for_tasks)
2405 transport_wait_for_tasks(cmd);
2406
2407 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2408
2409 if (cmd->se_lun)
2410 transport_lun_remove_cmd(cmd);
2411
2412 transport_put_cmd(cmd);
2413 }
2414 }
2415 EXPORT_SYMBOL(transport_generic_free_cmd);
2416
2417 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2418 * @se_sess: session to reference
2419 * @se_cmd: command descriptor to add
2420 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2421 */
2422 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2423 bool ack_kref)
2424 {
2425 unsigned long flags;
2426 int ret = 0;
2427
2428 kref_init(&se_cmd->cmd_kref);
2429 /*
2430 * Add a second kref if the fabric caller is expecting to handle
2431 * fabric acknowledgement that requires two target_put_sess_cmd()
2432 * invocations before se_cmd descriptor release.
2433 */
2434 if (ack_kref == true) {
2435 kref_get(&se_cmd->cmd_kref);
2436 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2437 }
2438
2439 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2440 if (se_sess->sess_tearing_down) {
2441 ret = -ESHUTDOWN;
2442 goto out;
2443 }
2444 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2445 se_cmd->check_release = 1;
2446
2447 out:
2448 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2449 return ret;
2450 }
2451
2452 static void target_release_cmd_kref(struct kref *kref)
2453 {
2454 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2455 struct se_session *se_sess = se_cmd->se_sess;
2456 unsigned long flags;
2457
2458 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2459 if (list_empty(&se_cmd->se_cmd_list)) {
2460 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2461 se_cmd->se_tfo->release_cmd(se_cmd);
2462 return;
2463 }
2464 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2465 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2466 complete(&se_cmd->cmd_wait_comp);
2467 return;
2468 }
2469 list_del(&se_cmd->se_cmd_list);
2470 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2471
2472 se_cmd->se_tfo->release_cmd(se_cmd);
2473 }
2474
2475 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2476 * @se_sess: session to reference
2477 * @se_cmd: command descriptor to drop
2478 */
2479 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2480 {
2481 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2482 }
2483 EXPORT_SYMBOL(target_put_sess_cmd);
2484
2485 /* target_sess_cmd_list_set_waiting - Flag all commands in
2486 * sess_cmd_list to complete cmd_wait_comp. Set
2487 * sess_tearing_down so no more commands are queued.
2488 * @se_sess: session to flag
2489 */
2490 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2491 {
2492 struct se_cmd *se_cmd;
2493 unsigned long flags;
2494
2495 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2496
2497 WARN_ON(se_sess->sess_tearing_down);
2498 se_sess->sess_tearing_down = 1;
2499
2500 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2501 se_cmd->cmd_wait_set = 1;
2502
2503 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2504 }
2505 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2506
2507 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2508 * @se_sess: session to wait for active I/O
2509 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2510 */
2511 void target_wait_for_sess_cmds(
2512 struct se_session *se_sess,
2513 int wait_for_tasks)
2514 {
2515 struct se_cmd *se_cmd, *tmp_cmd;
2516 bool rc = false;
2517
2518 list_for_each_entry_safe(se_cmd, tmp_cmd,
2519 &se_sess->sess_cmd_list, se_cmd_list) {
2520 list_del(&se_cmd->se_cmd_list);
2521
2522 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2523 " %d\n", se_cmd, se_cmd->t_state,
2524 se_cmd->se_tfo->get_cmd_state(se_cmd));
2525
2526 if (wait_for_tasks) {
2527 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2528 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2529 se_cmd->se_tfo->get_cmd_state(se_cmd));
2530
2531 rc = transport_wait_for_tasks(se_cmd);
2532
2533 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2534 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2535 se_cmd->se_tfo->get_cmd_state(se_cmd));
2536 }
2537
2538 if (!rc) {
2539 wait_for_completion(&se_cmd->cmd_wait_comp);
2540 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2541 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2542 se_cmd->se_tfo->get_cmd_state(se_cmd));
2543 }
2544
2545 se_cmd->se_tfo->release_cmd(se_cmd);
2546 }
2547 }
2548 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2549
2550 /* transport_lun_wait_for_tasks():
2551 *
2552 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2553 * an struct se_lun to be successfully shutdown.
2554 */
2555 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2556 {
2557 unsigned long flags;
2558 int ret = 0;
2559
2560 /*
2561 * If the frontend has already requested this struct se_cmd to
2562 * be stopped, we can safely ignore this struct se_cmd.
2563 */
2564 spin_lock_irqsave(&cmd->t_state_lock, flags);
2565 if (cmd->transport_state & CMD_T_STOP) {
2566 cmd->transport_state &= ~CMD_T_LUN_STOP;
2567
2568 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2569 cmd->se_tfo->get_task_tag(cmd));
2570 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2571 transport_cmd_check_stop(cmd, false);
2572 return -EPERM;
2573 }
2574 cmd->transport_state |= CMD_T_LUN_FE_STOP;
2575 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2576
2577 // XXX: audit task_flags checks.
2578 spin_lock_irqsave(&cmd->t_state_lock, flags);
2579 if ((cmd->transport_state & CMD_T_BUSY) &&
2580 (cmd->transport_state & CMD_T_SENT)) {
2581 if (!target_stop_cmd(cmd, &flags))
2582 ret++;
2583 }
2584 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2585
2586 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2587 " %d\n", cmd, ret);
2588 if (!ret) {
2589 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2590 cmd->se_tfo->get_task_tag(cmd));
2591 wait_for_completion(&cmd->transport_lun_stop_comp);
2592 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2593 cmd->se_tfo->get_task_tag(cmd));
2594 }
2595
2596 return 0;
2597 }
2598
2599 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2600 {
2601 struct se_cmd *cmd = NULL;
2602 unsigned long lun_flags, cmd_flags;
2603 /*
2604 * Do exception processing and return CHECK_CONDITION status to the
2605 * Initiator Port.
2606 */
2607 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2608 while (!list_empty(&lun->lun_cmd_list)) {
2609 cmd = list_first_entry(&lun->lun_cmd_list,
2610 struct se_cmd, se_lun_node);
2611 list_del_init(&cmd->se_lun_node);
2612
2613 spin_lock(&cmd->t_state_lock);
2614 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2615 "_lun_stop for ITT: 0x%08x\n",
2616 cmd->se_lun->unpacked_lun,
2617 cmd->se_tfo->get_task_tag(cmd));
2618 cmd->transport_state |= CMD_T_LUN_STOP;
2619 spin_unlock(&cmd->t_state_lock);
2620
2621 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2622
2623 if (!cmd->se_lun) {
2624 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2625 cmd->se_tfo->get_task_tag(cmd),
2626 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2627 BUG();
2628 }
2629 /*
2630 * If the Storage engine still owns the iscsi_cmd_t, determine
2631 * and/or stop its context.
2632 */
2633 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2634 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2635 cmd->se_tfo->get_task_tag(cmd));
2636
2637 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2638 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2639 continue;
2640 }
2641
2642 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2643 "_wait_for_tasks(): SUCCESS\n",
2644 cmd->se_lun->unpacked_lun,
2645 cmd->se_tfo->get_task_tag(cmd));
2646
2647 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2648 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2649 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2650 goto check_cond;
2651 }
2652 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2653 target_remove_from_state_list(cmd);
2654 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2655
2656 /*
2657 * The Storage engine stopped this struct se_cmd before it was
2658 * send to the fabric frontend for delivery back to the
2659 * Initiator Node. Return this SCSI CDB back with an
2660 * CHECK_CONDITION status.
2661 */
2662 check_cond:
2663 transport_send_check_condition_and_sense(cmd,
2664 TCM_NON_EXISTENT_LUN, 0);
2665 /*
2666 * If the fabric frontend is waiting for this iscsi_cmd_t to
2667 * be released, notify the waiting thread now that LU has
2668 * finished accessing it.
2669 */
2670 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2671 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2672 pr_debug("SE_LUN[%d] - Detected FE stop for"
2673 " struct se_cmd: %p ITT: 0x%08x\n",
2674 lun->unpacked_lun,
2675 cmd, cmd->se_tfo->get_task_tag(cmd));
2676
2677 spin_unlock_irqrestore(&cmd->t_state_lock,
2678 cmd_flags);
2679 transport_cmd_check_stop(cmd, false);
2680 complete(&cmd->transport_lun_fe_stop_comp);
2681 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2682 continue;
2683 }
2684 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2685 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2686
2687 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2688 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2689 }
2690 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2691 }
2692
2693 static int transport_clear_lun_thread(void *p)
2694 {
2695 struct se_lun *lun = p;
2696
2697 __transport_clear_lun_from_sessions(lun);
2698 complete(&lun->lun_shutdown_comp);
2699
2700 return 0;
2701 }
2702
2703 int transport_clear_lun_from_sessions(struct se_lun *lun)
2704 {
2705 struct task_struct *kt;
2706
2707 kt = kthread_run(transport_clear_lun_thread, lun,
2708 "tcm_cl_%u", lun->unpacked_lun);
2709 if (IS_ERR(kt)) {
2710 pr_err("Unable to start clear_lun thread\n");
2711 return PTR_ERR(kt);
2712 }
2713 wait_for_completion(&lun->lun_shutdown_comp);
2714
2715 return 0;
2716 }
2717
2718 /**
2719 * transport_wait_for_tasks - wait for completion to occur
2720 * @cmd: command to wait
2721 *
2722 * Called from frontend fabric context to wait for storage engine
2723 * to pause and/or release frontend generated struct se_cmd.
2724 */
2725 bool transport_wait_for_tasks(struct se_cmd *cmd)
2726 {
2727 unsigned long flags;
2728
2729 spin_lock_irqsave(&cmd->t_state_lock, flags);
2730 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2731 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2732 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2733 return false;
2734 }
2735
2736 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2737 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2738 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2739 return false;
2740 }
2741 /*
2742 * If we are already stopped due to an external event (ie: LUN shutdown)
2743 * sleep until the connection can have the passed struct se_cmd back.
2744 * The cmd->transport_lun_stopped_sem will be upped by
2745 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2746 * has completed its operation on the struct se_cmd.
2747 */
2748 if (cmd->transport_state & CMD_T_LUN_STOP) {
2749 pr_debug("wait_for_tasks: Stopping"
2750 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2751 "_stop_comp); for ITT: 0x%08x\n",
2752 cmd->se_tfo->get_task_tag(cmd));
2753 /*
2754 * There is a special case for WRITES where a FE exception +
2755 * LUN shutdown means ConfigFS context is still sleeping on
2756 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2757 * We go ahead and up transport_lun_stop_comp just to be sure
2758 * here.
2759 */
2760 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2761 complete(&cmd->transport_lun_stop_comp);
2762 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2763 spin_lock_irqsave(&cmd->t_state_lock, flags);
2764
2765 target_remove_from_state_list(cmd);
2766 /*
2767 * At this point, the frontend who was the originator of this
2768 * struct se_cmd, now owns the structure and can be released through
2769 * normal means below.
2770 */
2771 pr_debug("wait_for_tasks: Stopped"
2772 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2773 "stop_comp); for ITT: 0x%08x\n",
2774 cmd->se_tfo->get_task_tag(cmd));
2775
2776 cmd->transport_state &= ~CMD_T_LUN_STOP;
2777 }
2778
2779 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2780 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2781 return false;
2782 }
2783
2784 cmd->transport_state |= CMD_T_STOP;
2785
2786 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2787 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2788 cmd, cmd->se_tfo->get_task_tag(cmd),
2789 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2790
2791 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2792
2793 wait_for_completion(&cmd->t_transport_stop_comp);
2794
2795 spin_lock_irqsave(&cmd->t_state_lock, flags);
2796 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2797
2798 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
2799 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2800 cmd->se_tfo->get_task_tag(cmd));
2801
2802 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2803
2804 return true;
2805 }
2806 EXPORT_SYMBOL(transport_wait_for_tasks);
2807
2808 static int transport_get_sense_codes(
2809 struct se_cmd *cmd,
2810 u8 *asc,
2811 u8 *ascq)
2812 {
2813 *asc = cmd->scsi_asc;
2814 *ascq = cmd->scsi_ascq;
2815
2816 return 0;
2817 }
2818
2819 static int transport_set_sense_codes(
2820 struct se_cmd *cmd,
2821 u8 asc,
2822 u8 ascq)
2823 {
2824 cmd->scsi_asc = asc;
2825 cmd->scsi_ascq = ascq;
2826
2827 return 0;
2828 }
2829
2830 int transport_send_check_condition_and_sense(
2831 struct se_cmd *cmd,
2832 u8 reason,
2833 int from_transport)
2834 {
2835 unsigned char *buffer = cmd->sense_buffer;
2836 unsigned long flags;
2837 int offset;
2838 u8 asc = 0, ascq = 0;
2839
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);
2843 return 0;
2844 }
2845 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2846 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2847
2848 if (!reason && from_transport)
2849 goto after_reason;
2850
2851 if (!from_transport)
2852 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2853 /*
2854 * Data Segment and SenseLength of the fabric response PDU.
2855 *
2856 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2857 * from include/scsi/scsi_cmnd.h
2858 */
2859 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2860 TRANSPORT_SENSE_BUFFER);
2861 /*
2862 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2863 * SENSE KEY values from include/scsi/scsi.h
2864 */
2865 switch (reason) {
2866 case TCM_NON_EXISTENT_LUN:
2867 /* CURRENT ERROR */
2868 buffer[offset] = 0x70;
2869 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2870 /* ILLEGAL REQUEST */
2871 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2872 /* LOGICAL UNIT NOT SUPPORTED */
2873 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2874 break;
2875 case TCM_UNSUPPORTED_SCSI_OPCODE:
2876 case TCM_SECTOR_COUNT_TOO_MANY:
2877 /* CURRENT ERROR */
2878 buffer[offset] = 0x70;
2879 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2880 /* ILLEGAL REQUEST */
2881 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2882 /* INVALID COMMAND OPERATION CODE */
2883 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2884 break;
2885 case TCM_UNKNOWN_MODE_PAGE:
2886 /* CURRENT ERROR */
2887 buffer[offset] = 0x70;
2888 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2889 /* ILLEGAL REQUEST */
2890 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2891 /* INVALID FIELD IN CDB */
2892 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2893 break;
2894 case TCM_CHECK_CONDITION_ABORT_CMD:
2895 /* CURRENT ERROR */
2896 buffer[offset] = 0x70;
2897 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2898 /* ABORTED COMMAND */
2899 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2900 /* BUS DEVICE RESET FUNCTION OCCURRED */
2901 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2902 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2903 break;
2904 case TCM_INCORRECT_AMOUNT_OF_DATA:
2905 /* CURRENT ERROR */
2906 buffer[offset] = 0x70;
2907 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2908 /* ABORTED COMMAND */
2909 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2910 /* WRITE ERROR */
2911 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2912 /* NOT ENOUGH UNSOLICITED DATA */
2913 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2914 break;
2915 case TCM_INVALID_CDB_FIELD:
2916 /* CURRENT ERROR */
2917 buffer[offset] = 0x70;
2918 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2919 /* ILLEGAL REQUEST */
2920 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2921 /* INVALID FIELD IN CDB */
2922 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2923 break;
2924 case TCM_INVALID_PARAMETER_LIST:
2925 /* CURRENT ERROR */
2926 buffer[offset] = 0x70;
2927 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2928 /* ILLEGAL REQUEST */
2929 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2930 /* INVALID FIELD IN PARAMETER LIST */
2931 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2932 break;
2933 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2934 /* CURRENT ERROR */
2935 buffer[offset] = 0x70;
2936 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2937 /* ABORTED COMMAND */
2938 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2939 /* WRITE ERROR */
2940 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2941 /* UNEXPECTED_UNSOLICITED_DATA */
2942 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2943 break;
2944 case TCM_SERVICE_CRC_ERROR:
2945 /* CURRENT ERROR */
2946 buffer[offset] = 0x70;
2947 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2948 /* ABORTED COMMAND */
2949 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2950 /* PROTOCOL SERVICE CRC ERROR */
2951 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2952 /* N/A */
2953 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2954 break;
2955 case TCM_SNACK_REJECTED:
2956 /* CURRENT ERROR */
2957 buffer[offset] = 0x70;
2958 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2959 /* ABORTED COMMAND */
2960 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2961 /* READ ERROR */
2962 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2963 /* FAILED RETRANSMISSION REQUEST */
2964 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2965 break;
2966 case TCM_WRITE_PROTECTED:
2967 /* CURRENT ERROR */
2968 buffer[offset] = 0x70;
2969 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2970 /* DATA PROTECT */
2971 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2972 /* WRITE PROTECTED */
2973 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2974 break;
2975 case TCM_ADDRESS_OUT_OF_RANGE:
2976 /* CURRENT ERROR */
2977 buffer[offset] = 0x70;
2978 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2979 /* ILLEGAL REQUEST */
2980 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2981 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2982 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
2983 break;
2984 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2985 /* CURRENT ERROR */
2986 buffer[offset] = 0x70;
2987 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2988 /* UNIT ATTENTION */
2989 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2990 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2991 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2992 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2993 break;
2994 case TCM_CHECK_CONDITION_NOT_READY:
2995 /* CURRENT ERROR */
2996 buffer[offset] = 0x70;
2997 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2998 /* Not Ready */
2999 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3000 transport_get_sense_codes(cmd, &asc, &ascq);
3001 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3002 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3003 break;
3004 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3005 default:
3006 /* CURRENT ERROR */
3007 buffer[offset] = 0x70;
3008 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3009 /* ILLEGAL REQUEST */
3010 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3011 /* LOGICAL UNIT COMMUNICATION FAILURE */
3012 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3013 break;
3014 }
3015 /*
3016 * This code uses linux/include/scsi/scsi.h SAM status codes!
3017 */
3018 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3019 /*
3020 * Automatically padded, this value is encoded in the fabric's
3021 * data_length response PDU containing the SCSI defined sense data.
3022 */
3023 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
3024
3025 after_reason:
3026 return cmd->se_tfo->queue_status(cmd);
3027 }
3028 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3029
3030 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3031 {
3032 int ret = 0;
3033
3034 if (cmd->transport_state & CMD_T_ABORTED) {
3035 if (!send_status ||
3036 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3037 return 1;
3038
3039 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3040 " status for CDB: 0x%02x ITT: 0x%08x\n",
3041 cmd->t_task_cdb[0],
3042 cmd->se_tfo->get_task_tag(cmd));
3043
3044 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3045 cmd->se_tfo->queue_status(cmd);
3046 ret = 1;
3047 }
3048 return ret;
3049 }
3050 EXPORT_SYMBOL(transport_check_aborted_status);
3051
3052 void transport_send_task_abort(struct se_cmd *cmd)
3053 {
3054 unsigned long flags;
3055
3056 spin_lock_irqsave(&cmd->t_state_lock, flags);
3057 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3058 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3059 return;
3060 }
3061 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3062
3063 /*
3064 * If there are still expected incoming fabric WRITEs, we wait
3065 * until until they have completed before sending a TASK_ABORTED
3066 * response. This response with TASK_ABORTED status will be
3067 * queued back to fabric module by transport_check_aborted_status().
3068 */
3069 if (cmd->data_direction == DMA_TO_DEVICE) {
3070 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3071 cmd->transport_state |= CMD_T_ABORTED;
3072 smp_mb__after_atomic_inc();
3073 }
3074 }
3075 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3076
3077 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3078 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3079 cmd->se_tfo->get_task_tag(cmd));
3080
3081 cmd->se_tfo->queue_status(cmd);
3082 }
3083
3084 static void target_tmr_work(struct work_struct *work)
3085 {
3086 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3087 struct se_device *dev = cmd->se_dev;
3088 struct se_tmr_req *tmr = cmd->se_tmr_req;
3089 int ret;
3090
3091 switch (tmr->function) {
3092 case TMR_ABORT_TASK:
3093 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3094 break;
3095 case TMR_ABORT_TASK_SET:
3096 case TMR_CLEAR_ACA:
3097 case TMR_CLEAR_TASK_SET:
3098 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3099 break;
3100 case TMR_LUN_RESET:
3101 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3102 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3103 TMR_FUNCTION_REJECTED;
3104 break;
3105 case TMR_TARGET_WARM_RESET:
3106 tmr->response = TMR_FUNCTION_REJECTED;
3107 break;
3108 case TMR_TARGET_COLD_RESET:
3109 tmr->response = TMR_FUNCTION_REJECTED;
3110 break;
3111 default:
3112 pr_err("Uknown TMR function: 0x%02x.\n",
3113 tmr->function);
3114 tmr->response = TMR_FUNCTION_REJECTED;
3115 break;
3116 }
3117
3118 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3119 cmd->se_tfo->queue_tm_rsp(cmd);
3120
3121 transport_cmd_check_stop_to_fabric(cmd);
3122 }
3123
3124 int transport_generic_handle_tmr(
3125 struct se_cmd *cmd)
3126 {
3127 INIT_WORK(&cmd->work, target_tmr_work);
3128 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3129 return 0;
3130 }
3131 EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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