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Merge tag 'sound-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
[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 err_dev_list;
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 err_dev_list;
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 err_wq;
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
1140 err_wq:
1141 destroy_workqueue(dev->tmr_wq);
1142 err_dev_list:
1143 spin_lock(&hba->device_lock);
1144 list_del(&dev->dev_list);
1145 hba->dev_count--;
1146 spin_unlock(&hba->device_lock);
1147
1148 se_release_vpd_for_dev(dev);
1149
1150 kfree(dev);
1151
1152 return NULL;
1153 }
1154 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1155
1156 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1157 {
1158 struct se_device *dev = cmd->se_dev;
1159
1160 if (cmd->unknown_data_length) {
1161 cmd->data_length = size;
1162 } else if (size != cmd->data_length) {
1163 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1164 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1165 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1166 cmd->data_length, size, cmd->t_task_cdb[0]);
1167
1168 cmd->cmd_spdtl = size;
1169
1170 if (cmd->data_direction == DMA_TO_DEVICE) {
1171 pr_err("Rejecting underflow/overflow"
1172 " WRITE data\n");
1173 goto out_invalid_cdb_field;
1174 }
1175 /*
1176 * Reject READ_* or WRITE_* with overflow/underflow for
1177 * type SCF_SCSI_DATA_CDB.
1178 */
1179 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1180 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1181 " CDB on non 512-byte sector setup subsystem"
1182 " plugin: %s\n", dev->transport->name);
1183 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1184 goto out_invalid_cdb_field;
1185 }
1186
1187 if (size > cmd->data_length) {
1188 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1189 cmd->residual_count = (size - cmd->data_length);
1190 } else {
1191 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1192 cmd->residual_count = (cmd->data_length - size);
1193 }
1194 cmd->data_length = size;
1195 }
1196
1197 return 0;
1198
1199 out_invalid_cdb_field:
1200 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1201 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1202 return -EINVAL;
1203 }
1204
1205 /*
1206 * Used by fabric modules containing a local struct se_cmd within their
1207 * fabric dependent per I/O descriptor.
1208 */
1209 void transport_init_se_cmd(
1210 struct se_cmd *cmd,
1211 struct target_core_fabric_ops *tfo,
1212 struct se_session *se_sess,
1213 u32 data_length,
1214 int data_direction,
1215 int task_attr,
1216 unsigned char *sense_buffer)
1217 {
1218 INIT_LIST_HEAD(&cmd->se_lun_node);
1219 INIT_LIST_HEAD(&cmd->se_delayed_node);
1220 INIT_LIST_HEAD(&cmd->se_qf_node);
1221 INIT_LIST_HEAD(&cmd->se_cmd_list);
1222 INIT_LIST_HEAD(&cmd->state_list);
1223 init_completion(&cmd->transport_lun_fe_stop_comp);
1224 init_completion(&cmd->transport_lun_stop_comp);
1225 init_completion(&cmd->t_transport_stop_comp);
1226 init_completion(&cmd->cmd_wait_comp);
1227 init_completion(&cmd->task_stop_comp);
1228 spin_lock_init(&cmd->t_state_lock);
1229 cmd->transport_state = CMD_T_DEV_ACTIVE;
1230
1231 cmd->se_tfo = tfo;
1232 cmd->se_sess = se_sess;
1233 cmd->data_length = data_length;
1234 cmd->data_direction = data_direction;
1235 cmd->sam_task_attr = task_attr;
1236 cmd->sense_buffer = sense_buffer;
1237
1238 cmd->state_active = false;
1239 }
1240 EXPORT_SYMBOL(transport_init_se_cmd);
1241
1242 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1243 {
1244 /*
1245 * Check if SAM Task Attribute emulation is enabled for this
1246 * struct se_device storage object
1247 */
1248 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1249 return 0;
1250
1251 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1252 pr_debug("SAM Task Attribute ACA"
1253 " emulation is not supported\n");
1254 return -EINVAL;
1255 }
1256 /*
1257 * Used to determine when ORDERED commands should go from
1258 * Dormant to Active status.
1259 */
1260 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1261 smp_mb__after_atomic_inc();
1262 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1263 cmd->se_ordered_id, cmd->sam_task_attr,
1264 cmd->se_dev->transport->name);
1265 return 0;
1266 }
1267
1268 /* target_setup_cmd_from_cdb():
1269 *
1270 * Called from fabric RX Thread.
1271 */
1272 int target_setup_cmd_from_cdb(
1273 struct se_cmd *cmd,
1274 unsigned char *cdb)
1275 {
1276 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1277 u32 pr_reg_type = 0;
1278 u8 alua_ascq = 0;
1279 unsigned long flags;
1280 int ret;
1281
1282 /*
1283 * Ensure that the received CDB is less than the max (252 + 8) bytes
1284 * for VARIABLE_LENGTH_CMD
1285 */
1286 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1287 pr_err("Received SCSI CDB with command_size: %d that"
1288 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1289 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1290 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1291 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1292 return -EINVAL;
1293 }
1294 /*
1295 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1296 * allocate the additional extended CDB buffer now.. Otherwise
1297 * setup the pointer from __t_task_cdb to t_task_cdb.
1298 */
1299 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1300 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1301 GFP_KERNEL);
1302 if (!cmd->t_task_cdb) {
1303 pr_err("Unable to allocate cmd->t_task_cdb"
1304 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1305 scsi_command_size(cdb),
1306 (unsigned long)sizeof(cmd->__t_task_cdb));
1307 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1308 cmd->scsi_sense_reason =
1309 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1310 return -ENOMEM;
1311 }
1312 } else
1313 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1314 /*
1315 * Copy the original CDB into cmd->
1316 */
1317 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1318
1319 /*
1320 * Check for an existing UNIT ATTENTION condition
1321 */
1322 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1323 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1324 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1325 return -EINVAL;
1326 }
1327
1328 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1329 if (ret != 0) {
1330 /*
1331 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1332 * The ALUA additional sense code qualifier (ASCQ) is determined
1333 * by the ALUA primary or secondary access state..
1334 */
1335 if (ret > 0) {
1336 pr_debug("[%s]: ALUA TG Port not available, "
1337 "SenseKey: NOT_READY, ASC/ASCQ: "
1338 "0x04/0x%02x\n",
1339 cmd->se_tfo->get_fabric_name(), alua_ascq);
1340
1341 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1342 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1343 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1344 return -EINVAL;
1345 }
1346 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1347 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1348 return -EINVAL;
1349 }
1350
1351 /*
1352 * Check status for SPC-3 Persistent Reservations
1353 */
1354 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1355 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1356 cmd, cdb, pr_reg_type) != 0) {
1357 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1358 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1359 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1360 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1361 return -EBUSY;
1362 }
1363 /*
1364 * This means the CDB is allowed for the SCSI Initiator port
1365 * when said port is *NOT* holding the legacy SPC-2 or
1366 * SPC-3 Persistent Reservation.
1367 */
1368 }
1369
1370 ret = cmd->se_dev->transport->parse_cdb(cmd);
1371 if (ret < 0)
1372 return ret;
1373
1374 spin_lock_irqsave(&cmd->t_state_lock, flags);
1375 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1376 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1377
1378 /*
1379 * Check for SAM Task Attribute Emulation
1380 */
1381 if (transport_check_alloc_task_attr(cmd) < 0) {
1382 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1383 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1384 return -EINVAL;
1385 }
1386 spin_lock(&cmd->se_lun->lun_sep_lock);
1387 if (cmd->se_lun->lun_sep)
1388 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1389 spin_unlock(&cmd->se_lun->lun_sep_lock);
1390 return 0;
1391 }
1392 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1393
1394 /*
1395 * Used by fabric module frontends to queue tasks directly.
1396 * Many only be used from process context only
1397 */
1398 int transport_handle_cdb_direct(
1399 struct se_cmd *cmd)
1400 {
1401 int ret;
1402
1403 if (!cmd->se_lun) {
1404 dump_stack();
1405 pr_err("cmd->se_lun is NULL\n");
1406 return -EINVAL;
1407 }
1408 if (in_interrupt()) {
1409 dump_stack();
1410 pr_err("transport_generic_handle_cdb cannot be called"
1411 " from interrupt context\n");
1412 return -EINVAL;
1413 }
1414 /*
1415 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1416 * outstanding descriptors are handled correctly during shutdown via
1417 * transport_wait_for_tasks()
1418 *
1419 * Also, we don't take cmd->t_state_lock here as we only expect
1420 * this to be called for initial descriptor submission.
1421 */
1422 cmd->t_state = TRANSPORT_NEW_CMD;
1423 cmd->transport_state |= CMD_T_ACTIVE;
1424
1425 /*
1426 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1427 * so follow TRANSPORT_NEW_CMD processing thread context usage
1428 * and call transport_generic_request_failure() if necessary..
1429 */
1430 ret = transport_generic_new_cmd(cmd);
1431 if (ret < 0)
1432 transport_generic_request_failure(cmd);
1433
1434 return 0;
1435 }
1436 EXPORT_SYMBOL(transport_handle_cdb_direct);
1437
1438 /**
1439 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1440 *
1441 * @se_cmd: command descriptor to submit
1442 * @se_sess: associated se_sess for endpoint
1443 * @cdb: pointer to SCSI CDB
1444 * @sense: pointer to SCSI sense buffer
1445 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1446 * @data_length: fabric expected data transfer length
1447 * @task_addr: SAM task attribute
1448 * @data_dir: DMA data direction
1449 * @flags: flags for command submission from target_sc_flags_tables
1450 *
1451 * Returns non zero to signal active I/O shutdown failure. All other
1452 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1453 * but still return zero here.
1454 *
1455 * This may only be called from process context, and also currently
1456 * assumes internal allocation of fabric payload buffer by target-core.
1457 **/
1458 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1459 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1460 u32 data_length, int task_attr, int data_dir, int flags)
1461 {
1462 struct se_portal_group *se_tpg;
1463 int rc;
1464
1465 se_tpg = se_sess->se_tpg;
1466 BUG_ON(!se_tpg);
1467 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1468 BUG_ON(in_interrupt());
1469 /*
1470 * Initialize se_cmd for target operation. From this point
1471 * exceptions are handled by sending exception status via
1472 * target_core_fabric_ops->queue_status() callback
1473 */
1474 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1475 data_length, data_dir, task_attr, sense);
1476 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1477 se_cmd->unknown_data_length = 1;
1478 /*
1479 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1480 * se_sess->sess_cmd_list. A second kref_get here is necessary
1481 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1482 * kref_put() to happen during fabric packet acknowledgement.
1483 */
1484 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1485 if (rc)
1486 return rc;
1487 /*
1488 * Signal bidirectional data payloads to target-core
1489 */
1490 if (flags & TARGET_SCF_BIDI_OP)
1491 se_cmd->se_cmd_flags |= SCF_BIDI;
1492 /*
1493 * Locate se_lun pointer and attach it to struct se_cmd
1494 */
1495 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1496 transport_send_check_condition_and_sense(se_cmd,
1497 se_cmd->scsi_sense_reason, 0);
1498 target_put_sess_cmd(se_sess, se_cmd);
1499 return 0;
1500 }
1501
1502 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1503 if (rc != 0) {
1504 transport_generic_request_failure(se_cmd);
1505 return 0;
1506 }
1507
1508 /*
1509 * Check if we need to delay processing because of ALUA
1510 * Active/NonOptimized primary access state..
1511 */
1512 core_alua_check_nonop_delay(se_cmd);
1513
1514 transport_handle_cdb_direct(se_cmd);
1515 return 0;
1516 }
1517 EXPORT_SYMBOL(target_submit_cmd);
1518
1519 static void target_complete_tmr_failure(struct work_struct *work)
1520 {
1521 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1522
1523 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1524 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1525 transport_generic_free_cmd(se_cmd, 0);
1526 }
1527
1528 /**
1529 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1530 * for TMR CDBs
1531 *
1532 * @se_cmd: command descriptor to submit
1533 * @se_sess: associated se_sess for endpoint
1534 * @sense: pointer to SCSI sense buffer
1535 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1536 * @fabric_context: fabric context for TMR req
1537 * @tm_type: Type of TM request
1538 * @gfp: gfp type for caller
1539 * @tag: referenced task tag for TMR_ABORT_TASK
1540 * @flags: submit cmd flags
1541 *
1542 * Callable from all contexts.
1543 **/
1544
1545 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1546 unsigned char *sense, u32 unpacked_lun,
1547 void *fabric_tmr_ptr, unsigned char tm_type,
1548 gfp_t gfp, unsigned int tag, int flags)
1549 {
1550 struct se_portal_group *se_tpg;
1551 int ret;
1552
1553 se_tpg = se_sess->se_tpg;
1554 BUG_ON(!se_tpg);
1555
1556 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1557 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1558 /*
1559 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1560 * allocation failure.
1561 */
1562 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1563 if (ret < 0)
1564 return -ENOMEM;
1565
1566 if (tm_type == TMR_ABORT_TASK)
1567 se_cmd->se_tmr_req->ref_task_tag = tag;
1568
1569 /* See target_submit_cmd for commentary */
1570 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1571 if (ret) {
1572 core_tmr_release_req(se_cmd->se_tmr_req);
1573 return ret;
1574 }
1575
1576 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1577 if (ret) {
1578 /*
1579 * For callback during failure handling, push this work off
1580 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1581 */
1582 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1583 schedule_work(&se_cmd->work);
1584 return 0;
1585 }
1586 transport_generic_handle_tmr(se_cmd);
1587 return 0;
1588 }
1589 EXPORT_SYMBOL(target_submit_tmr);
1590
1591 /*
1592 * If the cmd is active, request it to be stopped and sleep until it
1593 * has completed.
1594 */
1595 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1596 {
1597 bool was_active = false;
1598
1599 if (cmd->transport_state & CMD_T_BUSY) {
1600 cmd->transport_state |= CMD_T_REQUEST_STOP;
1601 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1602
1603 pr_debug("cmd %p waiting to complete\n", cmd);
1604 wait_for_completion(&cmd->task_stop_comp);
1605 pr_debug("cmd %p stopped successfully\n", cmd);
1606
1607 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1608 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1609 cmd->transport_state &= ~CMD_T_BUSY;
1610 was_active = true;
1611 }
1612
1613 return was_active;
1614 }
1615
1616 /*
1617 * Handle SAM-esque emulation for generic transport request failures.
1618 */
1619 void transport_generic_request_failure(struct se_cmd *cmd)
1620 {
1621 int ret = 0;
1622
1623 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1624 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1625 cmd->t_task_cdb[0]);
1626 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1627 cmd->se_tfo->get_cmd_state(cmd),
1628 cmd->t_state, cmd->scsi_sense_reason);
1629 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1630 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1631 (cmd->transport_state & CMD_T_STOP) != 0,
1632 (cmd->transport_state & CMD_T_SENT) != 0);
1633
1634 /*
1635 * For SAM Task Attribute emulation for failed struct se_cmd
1636 */
1637 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1638 transport_complete_task_attr(cmd);
1639
1640 switch (cmd->scsi_sense_reason) {
1641 case TCM_NON_EXISTENT_LUN:
1642 case TCM_UNSUPPORTED_SCSI_OPCODE:
1643 case TCM_INVALID_CDB_FIELD:
1644 case TCM_INVALID_PARAMETER_LIST:
1645 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1646 case TCM_UNKNOWN_MODE_PAGE:
1647 case TCM_WRITE_PROTECTED:
1648 case TCM_ADDRESS_OUT_OF_RANGE:
1649 case TCM_CHECK_CONDITION_ABORT_CMD:
1650 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1651 case TCM_CHECK_CONDITION_NOT_READY:
1652 break;
1653 case TCM_RESERVATION_CONFLICT:
1654 /*
1655 * No SENSE Data payload for this case, set SCSI Status
1656 * and queue the response to $FABRIC_MOD.
1657 *
1658 * Uses linux/include/scsi/scsi.h SAM status codes defs
1659 */
1660 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1661 /*
1662 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1663 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1664 * CONFLICT STATUS.
1665 *
1666 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1667 */
1668 if (cmd->se_sess &&
1669 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1670 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1671 cmd->orig_fe_lun, 0x2C,
1672 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1673
1674 ret = cmd->se_tfo->queue_status(cmd);
1675 if (ret == -EAGAIN || ret == -ENOMEM)
1676 goto queue_full;
1677 goto check_stop;
1678 default:
1679 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1680 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1681 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1682 break;
1683 }
1684
1685 ret = transport_send_check_condition_and_sense(cmd,
1686 cmd->scsi_sense_reason, 0);
1687 if (ret == -EAGAIN || ret == -ENOMEM)
1688 goto queue_full;
1689
1690 check_stop:
1691 transport_lun_remove_cmd(cmd);
1692 if (!transport_cmd_check_stop_to_fabric(cmd))
1693 ;
1694 return;
1695
1696 queue_full:
1697 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1698 transport_handle_queue_full(cmd, cmd->se_dev);
1699 }
1700 EXPORT_SYMBOL(transport_generic_request_failure);
1701
1702 static void __target_execute_cmd(struct se_cmd *cmd)
1703 {
1704 int error = 0;
1705
1706 spin_lock_irq(&cmd->t_state_lock);
1707 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1708 spin_unlock_irq(&cmd->t_state_lock);
1709
1710 if (cmd->execute_cmd)
1711 error = cmd->execute_cmd(cmd);
1712
1713 if (error) {
1714 spin_lock_irq(&cmd->t_state_lock);
1715 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1716 spin_unlock_irq(&cmd->t_state_lock);
1717
1718 transport_generic_request_failure(cmd);
1719 }
1720 }
1721
1722 void target_execute_cmd(struct se_cmd *cmd)
1723 {
1724 struct se_device *dev = cmd->se_dev;
1725
1726 /*
1727 * If the received CDB has aleady been aborted stop processing it here.
1728 */
1729 if (transport_check_aborted_status(cmd, 1))
1730 return;
1731
1732 /*
1733 * Determine if IOCTL context caller in requesting the stopping of this
1734 * command for LUN shutdown purposes.
1735 */
1736 spin_lock_irq(&cmd->t_state_lock);
1737 if (cmd->transport_state & CMD_T_LUN_STOP) {
1738 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1739 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1740
1741 cmd->transport_state &= ~CMD_T_ACTIVE;
1742 spin_unlock_irq(&cmd->t_state_lock);
1743 complete(&cmd->transport_lun_stop_comp);
1744 return;
1745 }
1746 /*
1747 * Determine if frontend context caller is requesting the stopping of
1748 * this command for frontend exceptions.
1749 */
1750 if (cmd->transport_state & CMD_T_STOP) {
1751 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1752 __func__, __LINE__,
1753 cmd->se_tfo->get_task_tag(cmd));
1754
1755 spin_unlock_irq(&cmd->t_state_lock);
1756 complete(&cmd->t_transport_stop_comp);
1757 return;
1758 }
1759
1760 cmd->t_state = TRANSPORT_PROCESSING;
1761 spin_unlock_irq(&cmd->t_state_lock);
1762
1763 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1764 goto execute;
1765
1766 /*
1767 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1768 * to allow the passed struct se_cmd list of tasks to the front of the list.
1769 */
1770 switch (cmd->sam_task_attr) {
1771 case MSG_HEAD_TAG:
1772 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1773 "se_ordered_id: %u\n",
1774 cmd->t_task_cdb[0], cmd->se_ordered_id);
1775 goto execute;
1776 case MSG_ORDERED_TAG:
1777 atomic_inc(&dev->dev_ordered_sync);
1778 smp_mb__after_atomic_inc();
1779
1780 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1781 " se_ordered_id: %u\n",
1782 cmd->t_task_cdb[0], cmd->se_ordered_id);
1783
1784 /*
1785 * Execute an ORDERED command if no other older commands
1786 * exist that need to be completed first.
1787 */
1788 if (!atomic_read(&dev->simple_cmds))
1789 goto execute;
1790 break;
1791 default:
1792 /*
1793 * For SIMPLE and UNTAGGED Task Attribute commands
1794 */
1795 atomic_inc(&dev->simple_cmds);
1796 smp_mb__after_atomic_inc();
1797 break;
1798 }
1799
1800 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1801 spin_lock(&dev->delayed_cmd_lock);
1802 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1803 spin_unlock(&dev->delayed_cmd_lock);
1804
1805 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1806 " delayed CMD list, se_ordered_id: %u\n",
1807 cmd->t_task_cdb[0], cmd->sam_task_attr,
1808 cmd->se_ordered_id);
1809 return;
1810 }
1811
1812 execute:
1813 /*
1814 * Otherwise, no ORDERED task attributes exist..
1815 */
1816 __target_execute_cmd(cmd);
1817 }
1818 EXPORT_SYMBOL(target_execute_cmd);
1819
1820 /*
1821 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1822 */
1823 static int transport_get_sense_data(struct se_cmd *cmd)
1824 {
1825 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
1826 struct se_device *dev = cmd->se_dev;
1827 unsigned long flags;
1828 u32 offset = 0;
1829
1830 WARN_ON(!cmd->se_lun);
1831
1832 if (!dev)
1833 return 0;
1834
1835 spin_lock_irqsave(&cmd->t_state_lock, flags);
1836 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
1837 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1838 return 0;
1839 }
1840
1841 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
1842 goto out;
1843
1844 if (!dev->transport->get_sense_buffer) {
1845 pr_err("dev->transport->get_sense_buffer is NULL\n");
1846 goto out;
1847 }
1848
1849 sense_buffer = dev->transport->get_sense_buffer(cmd);
1850 if (!sense_buffer) {
1851 pr_err("ITT 0x%08x cmd %p: Unable to locate"
1852 " sense buffer for task with sense\n",
1853 cmd->se_tfo->get_task_tag(cmd), cmd);
1854 goto out;
1855 }
1856
1857 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1858
1859 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
1860
1861 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
1862
1863 /* Automatically padded */
1864 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
1865
1866 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
1867 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
1868 return 0;
1869
1870 out:
1871 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1872 return -1;
1873 }
1874
1875 /*
1876 * Process all commands up to the last received ORDERED task attribute which
1877 * requires another blocking boundary
1878 */
1879 static void target_restart_delayed_cmds(struct se_device *dev)
1880 {
1881 for (;;) {
1882 struct se_cmd *cmd;
1883
1884 spin_lock(&dev->delayed_cmd_lock);
1885 if (list_empty(&dev->delayed_cmd_list)) {
1886 spin_unlock(&dev->delayed_cmd_lock);
1887 break;
1888 }
1889
1890 cmd = list_entry(dev->delayed_cmd_list.next,
1891 struct se_cmd, se_delayed_node);
1892 list_del(&cmd->se_delayed_node);
1893 spin_unlock(&dev->delayed_cmd_lock);
1894
1895 __target_execute_cmd(cmd);
1896
1897 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1898 break;
1899 }
1900 }
1901
1902 /*
1903 * Called from I/O completion to determine which dormant/delayed
1904 * and ordered cmds need to have their tasks added to the execution queue.
1905 */
1906 static void transport_complete_task_attr(struct se_cmd *cmd)
1907 {
1908 struct se_device *dev = cmd->se_dev;
1909
1910 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1911 atomic_dec(&dev->simple_cmds);
1912 smp_mb__after_atomic_dec();
1913 dev->dev_cur_ordered_id++;
1914 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1915 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1916 cmd->se_ordered_id);
1917 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1918 dev->dev_cur_ordered_id++;
1919 pr_debug("Incremented dev_cur_ordered_id: %u for"
1920 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1921 cmd->se_ordered_id);
1922 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1923 atomic_dec(&dev->dev_ordered_sync);
1924 smp_mb__after_atomic_dec();
1925
1926 dev->dev_cur_ordered_id++;
1927 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1928 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1929 }
1930
1931 target_restart_delayed_cmds(dev);
1932 }
1933
1934 static void transport_complete_qf(struct se_cmd *cmd)
1935 {
1936 int ret = 0;
1937
1938 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1939 transport_complete_task_attr(cmd);
1940
1941 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1942 ret = cmd->se_tfo->queue_status(cmd);
1943 if (ret)
1944 goto out;
1945 }
1946
1947 switch (cmd->data_direction) {
1948 case DMA_FROM_DEVICE:
1949 ret = cmd->se_tfo->queue_data_in(cmd);
1950 break;
1951 case DMA_TO_DEVICE:
1952 if (cmd->t_bidi_data_sg) {
1953 ret = cmd->se_tfo->queue_data_in(cmd);
1954 if (ret < 0)
1955 break;
1956 }
1957 /* Fall through for DMA_TO_DEVICE */
1958 case DMA_NONE:
1959 ret = cmd->se_tfo->queue_status(cmd);
1960 break;
1961 default:
1962 break;
1963 }
1964
1965 out:
1966 if (ret < 0) {
1967 transport_handle_queue_full(cmd, cmd->se_dev);
1968 return;
1969 }
1970 transport_lun_remove_cmd(cmd);
1971 transport_cmd_check_stop_to_fabric(cmd);
1972 }
1973
1974 static void transport_handle_queue_full(
1975 struct se_cmd *cmd,
1976 struct se_device *dev)
1977 {
1978 spin_lock_irq(&dev->qf_cmd_lock);
1979 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1980 atomic_inc(&dev->dev_qf_count);
1981 smp_mb__after_atomic_inc();
1982 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1983
1984 schedule_work(&cmd->se_dev->qf_work_queue);
1985 }
1986
1987 static void target_complete_ok_work(struct work_struct *work)
1988 {
1989 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1990 int reason = 0, ret;
1991
1992 /*
1993 * Check if we need to move delayed/dormant tasks from cmds on the
1994 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1995 * Attribute.
1996 */
1997 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1998 transport_complete_task_attr(cmd);
1999 /*
2000 * Check to schedule QUEUE_FULL work, or execute an existing
2001 * cmd->transport_qf_callback()
2002 */
2003 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2004 schedule_work(&cmd->se_dev->qf_work_queue);
2005
2006 /*
2007 * Check if we need to retrieve a sense buffer from
2008 * the struct se_cmd in question.
2009 */
2010 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2011 if (transport_get_sense_data(cmd) < 0)
2012 reason = TCM_NON_EXISTENT_LUN;
2013
2014 if (cmd->scsi_status) {
2015 ret = transport_send_check_condition_and_sense(
2016 cmd, reason, 1);
2017 if (ret == -EAGAIN || ret == -ENOMEM)
2018 goto queue_full;
2019
2020 transport_lun_remove_cmd(cmd);
2021 transport_cmd_check_stop_to_fabric(cmd);
2022 return;
2023 }
2024 }
2025 /*
2026 * Check for a callback, used by amongst other things
2027 * XDWRITE_READ_10 emulation.
2028 */
2029 if (cmd->transport_complete_callback)
2030 cmd->transport_complete_callback(cmd);
2031
2032 switch (cmd->data_direction) {
2033 case DMA_FROM_DEVICE:
2034 spin_lock(&cmd->se_lun->lun_sep_lock);
2035 if (cmd->se_lun->lun_sep) {
2036 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2037 cmd->data_length;
2038 }
2039 spin_unlock(&cmd->se_lun->lun_sep_lock);
2040
2041 ret = cmd->se_tfo->queue_data_in(cmd);
2042 if (ret == -EAGAIN || ret == -ENOMEM)
2043 goto queue_full;
2044 break;
2045 case DMA_TO_DEVICE:
2046 spin_lock(&cmd->se_lun->lun_sep_lock);
2047 if (cmd->se_lun->lun_sep) {
2048 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2049 cmd->data_length;
2050 }
2051 spin_unlock(&cmd->se_lun->lun_sep_lock);
2052 /*
2053 * Check if we need to send READ payload for BIDI-COMMAND
2054 */
2055 if (cmd->t_bidi_data_sg) {
2056 spin_lock(&cmd->se_lun->lun_sep_lock);
2057 if (cmd->se_lun->lun_sep) {
2058 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2059 cmd->data_length;
2060 }
2061 spin_unlock(&cmd->se_lun->lun_sep_lock);
2062 ret = cmd->se_tfo->queue_data_in(cmd);
2063 if (ret == -EAGAIN || ret == -ENOMEM)
2064 goto queue_full;
2065 break;
2066 }
2067 /* Fall through for DMA_TO_DEVICE */
2068 case DMA_NONE:
2069 ret = cmd->se_tfo->queue_status(cmd);
2070 if (ret == -EAGAIN || ret == -ENOMEM)
2071 goto queue_full;
2072 break;
2073 default:
2074 break;
2075 }
2076
2077 transport_lun_remove_cmd(cmd);
2078 transport_cmd_check_stop_to_fabric(cmd);
2079 return;
2080
2081 queue_full:
2082 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2083 " data_direction: %d\n", cmd, cmd->data_direction);
2084 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2085 transport_handle_queue_full(cmd, cmd->se_dev);
2086 }
2087
2088 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2089 {
2090 struct scatterlist *sg;
2091 int count;
2092
2093 for_each_sg(sgl, sg, nents, count)
2094 __free_page(sg_page(sg));
2095
2096 kfree(sgl);
2097 }
2098
2099 static inline void transport_free_pages(struct se_cmd *cmd)
2100 {
2101 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2102 return;
2103
2104 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2105 cmd->t_data_sg = NULL;
2106 cmd->t_data_nents = 0;
2107
2108 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2109 cmd->t_bidi_data_sg = NULL;
2110 cmd->t_bidi_data_nents = 0;
2111 }
2112
2113 /**
2114 * transport_release_cmd - free a command
2115 * @cmd: command to free
2116 *
2117 * This routine unconditionally frees a command, and reference counting
2118 * or list removal must be done in the caller.
2119 */
2120 static void transport_release_cmd(struct se_cmd *cmd)
2121 {
2122 BUG_ON(!cmd->se_tfo);
2123
2124 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2125 core_tmr_release_req(cmd->se_tmr_req);
2126 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2127 kfree(cmd->t_task_cdb);
2128 /*
2129 * If this cmd has been setup with target_get_sess_cmd(), drop
2130 * the kref and call ->release_cmd() in kref callback.
2131 */
2132 if (cmd->check_release != 0) {
2133 target_put_sess_cmd(cmd->se_sess, cmd);
2134 return;
2135 }
2136 cmd->se_tfo->release_cmd(cmd);
2137 }
2138
2139 /**
2140 * transport_put_cmd - release a reference to a command
2141 * @cmd: command to release
2142 *
2143 * This routine releases our reference to the command and frees it if possible.
2144 */
2145 static void transport_put_cmd(struct se_cmd *cmd)
2146 {
2147 unsigned long flags;
2148
2149 spin_lock_irqsave(&cmd->t_state_lock, flags);
2150 if (atomic_read(&cmd->t_fe_count)) {
2151 if (!atomic_dec_and_test(&cmd->t_fe_count))
2152 goto out_busy;
2153 }
2154
2155 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2156 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2157 target_remove_from_state_list(cmd);
2158 }
2159 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2160
2161 transport_free_pages(cmd);
2162 transport_release_cmd(cmd);
2163 return;
2164 out_busy:
2165 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2166 }
2167
2168 /*
2169 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2170 * allocating in the core.
2171 * @cmd: Associated se_cmd descriptor
2172 * @mem: SGL style memory for TCM WRITE / READ
2173 * @sg_mem_num: Number of SGL elements
2174 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2175 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2176 *
2177 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2178 * of parameters.
2179 */
2180 int transport_generic_map_mem_to_cmd(
2181 struct se_cmd *cmd,
2182 struct scatterlist *sgl,
2183 u32 sgl_count,
2184 struct scatterlist *sgl_bidi,
2185 u32 sgl_bidi_count)
2186 {
2187 if (!sgl || !sgl_count)
2188 return 0;
2189
2190 /*
2191 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2192 * scatterlists already have been set to follow what the fabric
2193 * passes for the original expected data transfer length.
2194 */
2195 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2196 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2197 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2198 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2199 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2200 return -EINVAL;
2201 }
2202
2203 cmd->t_data_sg = sgl;
2204 cmd->t_data_nents = sgl_count;
2205
2206 if (sgl_bidi && sgl_bidi_count) {
2207 cmd->t_bidi_data_sg = sgl_bidi;
2208 cmd->t_bidi_data_nents = sgl_bidi_count;
2209 }
2210 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2211 return 0;
2212 }
2213 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2214
2215 void *transport_kmap_data_sg(struct se_cmd *cmd)
2216 {
2217 struct scatterlist *sg = cmd->t_data_sg;
2218 struct page **pages;
2219 int i;
2220
2221 BUG_ON(!sg);
2222 /*
2223 * We need to take into account a possible offset here for fabrics like
2224 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2225 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2226 */
2227 if (!cmd->t_data_nents)
2228 return NULL;
2229 else if (cmd->t_data_nents == 1)
2230 return kmap(sg_page(sg)) + sg->offset;
2231
2232 /* >1 page. use vmap */
2233 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2234 if (!pages)
2235 return NULL;
2236
2237 /* convert sg[] to pages[] */
2238 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2239 pages[i] = sg_page(sg);
2240 }
2241
2242 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2243 kfree(pages);
2244 if (!cmd->t_data_vmap)
2245 return NULL;
2246
2247 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2248 }
2249 EXPORT_SYMBOL(transport_kmap_data_sg);
2250
2251 void transport_kunmap_data_sg(struct se_cmd *cmd)
2252 {
2253 if (!cmd->t_data_nents) {
2254 return;
2255 } else if (cmd->t_data_nents == 1) {
2256 kunmap(sg_page(cmd->t_data_sg));
2257 return;
2258 }
2259
2260 vunmap(cmd->t_data_vmap);
2261 cmd->t_data_vmap = NULL;
2262 }
2263 EXPORT_SYMBOL(transport_kunmap_data_sg);
2264
2265 static int
2266 transport_generic_get_mem(struct se_cmd *cmd)
2267 {
2268 u32 length = cmd->data_length;
2269 unsigned int nents;
2270 struct page *page;
2271 gfp_t zero_flag;
2272 int i = 0;
2273
2274 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2275 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2276 if (!cmd->t_data_sg)
2277 return -ENOMEM;
2278
2279 cmd->t_data_nents = nents;
2280 sg_init_table(cmd->t_data_sg, nents);
2281
2282 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2283
2284 while (length) {
2285 u32 page_len = min_t(u32, length, PAGE_SIZE);
2286 page = alloc_page(GFP_KERNEL | zero_flag);
2287 if (!page)
2288 goto out;
2289
2290 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2291 length -= page_len;
2292 i++;
2293 }
2294 return 0;
2295
2296 out:
2297 while (i >= 0) {
2298 __free_page(sg_page(&cmd->t_data_sg[i]));
2299 i--;
2300 }
2301 kfree(cmd->t_data_sg);
2302 cmd->t_data_sg = NULL;
2303 return -ENOMEM;
2304 }
2305
2306 /*
2307 * Allocate any required resources to execute the command. For writes we
2308 * might not have the payload yet, so notify the fabric via a call to
2309 * ->write_pending instead. Otherwise place it on the execution queue.
2310 */
2311 int transport_generic_new_cmd(struct se_cmd *cmd)
2312 {
2313 int ret = 0;
2314
2315 /*
2316 * Determine is the TCM fabric module has already allocated physical
2317 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2318 * beforehand.
2319 */
2320 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2321 cmd->data_length) {
2322 ret = transport_generic_get_mem(cmd);
2323 if (ret < 0)
2324 goto out_fail;
2325 }
2326
2327 /* Workaround for handling zero-length control CDBs */
2328 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) {
2329 spin_lock_irq(&cmd->t_state_lock);
2330 cmd->t_state = TRANSPORT_COMPLETE;
2331 cmd->transport_state |= CMD_T_ACTIVE;
2332 spin_unlock_irq(&cmd->t_state_lock);
2333
2334 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2335 u8 ua_asc = 0, ua_ascq = 0;
2336
2337 core_scsi3_ua_clear_for_request_sense(cmd,
2338 &ua_asc, &ua_ascq);
2339 }
2340
2341 INIT_WORK(&cmd->work, target_complete_ok_work);
2342 queue_work(target_completion_wq, &cmd->work);
2343 return 0;
2344 }
2345
2346 atomic_inc(&cmd->t_fe_count);
2347
2348 /*
2349 * If this command is not a write we can execute it right here,
2350 * for write buffers we need to notify the fabric driver first
2351 * and let it call back once the write buffers are ready.
2352 */
2353 target_add_to_state_list(cmd);
2354 if (cmd->data_direction != DMA_TO_DEVICE) {
2355 target_execute_cmd(cmd);
2356 return 0;
2357 }
2358
2359 spin_lock_irq(&cmd->t_state_lock);
2360 cmd->t_state = TRANSPORT_WRITE_PENDING;
2361 spin_unlock_irq(&cmd->t_state_lock);
2362
2363 transport_cmd_check_stop(cmd, false);
2364
2365 ret = cmd->se_tfo->write_pending(cmd);
2366 if (ret == -EAGAIN || ret == -ENOMEM)
2367 goto queue_full;
2368
2369 if (ret < 0)
2370 return ret;
2371 return 1;
2372
2373 out_fail:
2374 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2375 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2376 return -EINVAL;
2377 queue_full:
2378 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2379 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2380 transport_handle_queue_full(cmd, cmd->se_dev);
2381 return 0;
2382 }
2383 EXPORT_SYMBOL(transport_generic_new_cmd);
2384
2385 static void transport_write_pending_qf(struct se_cmd *cmd)
2386 {
2387 int ret;
2388
2389 ret = cmd->se_tfo->write_pending(cmd);
2390 if (ret == -EAGAIN || ret == -ENOMEM) {
2391 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2392 cmd);
2393 transport_handle_queue_full(cmd, cmd->se_dev);
2394 }
2395 }
2396
2397 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2398 {
2399 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2400 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2401 transport_wait_for_tasks(cmd);
2402
2403 transport_release_cmd(cmd);
2404 } else {
2405 if (wait_for_tasks)
2406 transport_wait_for_tasks(cmd);
2407
2408 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2409
2410 if (cmd->se_lun)
2411 transport_lun_remove_cmd(cmd);
2412
2413 transport_put_cmd(cmd);
2414 }
2415 }
2416 EXPORT_SYMBOL(transport_generic_free_cmd);
2417
2418 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2419 * @se_sess: session to reference
2420 * @se_cmd: command descriptor to add
2421 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2422 */
2423 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2424 bool ack_kref)
2425 {
2426 unsigned long flags;
2427 int ret = 0;
2428
2429 kref_init(&se_cmd->cmd_kref);
2430 /*
2431 * Add a second kref if the fabric caller is expecting to handle
2432 * fabric acknowledgement that requires two target_put_sess_cmd()
2433 * invocations before se_cmd descriptor release.
2434 */
2435 if (ack_kref == true) {
2436 kref_get(&se_cmd->cmd_kref);
2437 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2438 }
2439
2440 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2441 if (se_sess->sess_tearing_down) {
2442 ret = -ESHUTDOWN;
2443 goto out;
2444 }
2445 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2446 se_cmd->check_release = 1;
2447
2448 out:
2449 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2450 return ret;
2451 }
2452
2453 static void target_release_cmd_kref(struct kref *kref)
2454 {
2455 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2456 struct se_session *se_sess = se_cmd->se_sess;
2457 unsigned long flags;
2458
2459 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2460 if (list_empty(&se_cmd->se_cmd_list)) {
2461 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2462 se_cmd->se_tfo->release_cmd(se_cmd);
2463 return;
2464 }
2465 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2466 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2467 complete(&se_cmd->cmd_wait_comp);
2468 return;
2469 }
2470 list_del(&se_cmd->se_cmd_list);
2471 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2472
2473 se_cmd->se_tfo->release_cmd(se_cmd);
2474 }
2475
2476 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2477 * @se_sess: session to reference
2478 * @se_cmd: command descriptor to drop
2479 */
2480 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2481 {
2482 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2483 }
2484 EXPORT_SYMBOL(target_put_sess_cmd);
2485
2486 /* target_sess_cmd_list_set_waiting - Flag all commands in
2487 * sess_cmd_list to complete cmd_wait_comp. Set
2488 * sess_tearing_down so no more commands are queued.
2489 * @se_sess: session to flag
2490 */
2491 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2492 {
2493 struct se_cmd *se_cmd;
2494 unsigned long flags;
2495
2496 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2497
2498 WARN_ON(se_sess->sess_tearing_down);
2499 se_sess->sess_tearing_down = 1;
2500
2501 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2502 se_cmd->cmd_wait_set = 1;
2503
2504 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2505 }
2506 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2507
2508 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2509 * @se_sess: session to wait for active I/O
2510 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2511 */
2512 void target_wait_for_sess_cmds(
2513 struct se_session *se_sess,
2514 int wait_for_tasks)
2515 {
2516 struct se_cmd *se_cmd, *tmp_cmd;
2517 bool rc = false;
2518
2519 list_for_each_entry_safe(se_cmd, tmp_cmd,
2520 &se_sess->sess_cmd_list, se_cmd_list) {
2521 list_del(&se_cmd->se_cmd_list);
2522
2523 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2524 " %d\n", se_cmd, se_cmd->t_state,
2525 se_cmd->se_tfo->get_cmd_state(se_cmd));
2526
2527 if (wait_for_tasks) {
2528 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2529 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2530 se_cmd->se_tfo->get_cmd_state(se_cmd));
2531
2532 rc = transport_wait_for_tasks(se_cmd);
2533
2534 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2535 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2536 se_cmd->se_tfo->get_cmd_state(se_cmd));
2537 }
2538
2539 if (!rc) {
2540 wait_for_completion(&se_cmd->cmd_wait_comp);
2541 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2542 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2543 se_cmd->se_tfo->get_cmd_state(se_cmd));
2544 }
2545
2546 se_cmd->se_tfo->release_cmd(se_cmd);
2547 }
2548 }
2549 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2550
2551 /* transport_lun_wait_for_tasks():
2552 *
2553 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2554 * an struct se_lun to be successfully shutdown.
2555 */
2556 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2557 {
2558 unsigned long flags;
2559 int ret = 0;
2560
2561 /*
2562 * If the frontend has already requested this struct se_cmd to
2563 * be stopped, we can safely ignore this struct se_cmd.
2564 */
2565 spin_lock_irqsave(&cmd->t_state_lock, flags);
2566 if (cmd->transport_state & CMD_T_STOP) {
2567 cmd->transport_state &= ~CMD_T_LUN_STOP;
2568
2569 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2570 cmd->se_tfo->get_task_tag(cmd));
2571 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2572 transport_cmd_check_stop(cmd, false);
2573 return -EPERM;
2574 }
2575 cmd->transport_state |= CMD_T_LUN_FE_STOP;
2576 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2577
2578 // XXX: audit task_flags checks.
2579 spin_lock_irqsave(&cmd->t_state_lock, flags);
2580 if ((cmd->transport_state & CMD_T_BUSY) &&
2581 (cmd->transport_state & CMD_T_SENT)) {
2582 if (!target_stop_cmd(cmd, &flags))
2583 ret++;
2584 }
2585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2586
2587 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2588 " %d\n", cmd, ret);
2589 if (!ret) {
2590 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2591 cmd->se_tfo->get_task_tag(cmd));
2592 wait_for_completion(&cmd->transport_lun_stop_comp);
2593 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2594 cmd->se_tfo->get_task_tag(cmd));
2595 }
2596
2597 return 0;
2598 }
2599
2600 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2601 {
2602 struct se_cmd *cmd = NULL;
2603 unsigned long lun_flags, cmd_flags;
2604 /*
2605 * Do exception processing and return CHECK_CONDITION status to the
2606 * Initiator Port.
2607 */
2608 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2609 while (!list_empty(&lun->lun_cmd_list)) {
2610 cmd = list_first_entry(&lun->lun_cmd_list,
2611 struct se_cmd, se_lun_node);
2612 list_del_init(&cmd->se_lun_node);
2613
2614 spin_lock(&cmd->t_state_lock);
2615 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2616 "_lun_stop for ITT: 0x%08x\n",
2617 cmd->se_lun->unpacked_lun,
2618 cmd->se_tfo->get_task_tag(cmd));
2619 cmd->transport_state |= CMD_T_LUN_STOP;
2620 spin_unlock(&cmd->t_state_lock);
2621
2622 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2623
2624 if (!cmd->se_lun) {
2625 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2626 cmd->se_tfo->get_task_tag(cmd),
2627 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2628 BUG();
2629 }
2630 /*
2631 * If the Storage engine still owns the iscsi_cmd_t, determine
2632 * and/or stop its context.
2633 */
2634 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2635 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2636 cmd->se_tfo->get_task_tag(cmd));
2637
2638 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2639 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2640 continue;
2641 }
2642
2643 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2644 "_wait_for_tasks(): SUCCESS\n",
2645 cmd->se_lun->unpacked_lun,
2646 cmd->se_tfo->get_task_tag(cmd));
2647
2648 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2649 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2650 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2651 goto check_cond;
2652 }
2653 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2654 target_remove_from_state_list(cmd);
2655 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2656
2657 /*
2658 * The Storage engine stopped this struct se_cmd before it was
2659 * send to the fabric frontend for delivery back to the
2660 * Initiator Node. Return this SCSI CDB back with an
2661 * CHECK_CONDITION status.
2662 */
2663 check_cond:
2664 transport_send_check_condition_and_sense(cmd,
2665 TCM_NON_EXISTENT_LUN, 0);
2666 /*
2667 * If the fabric frontend is waiting for this iscsi_cmd_t to
2668 * be released, notify the waiting thread now that LU has
2669 * finished accessing it.
2670 */
2671 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2672 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2673 pr_debug("SE_LUN[%d] - Detected FE stop for"
2674 " struct se_cmd: %p ITT: 0x%08x\n",
2675 lun->unpacked_lun,
2676 cmd, cmd->se_tfo->get_task_tag(cmd));
2677
2678 spin_unlock_irqrestore(&cmd->t_state_lock,
2679 cmd_flags);
2680 transport_cmd_check_stop(cmd, false);
2681 complete(&cmd->transport_lun_fe_stop_comp);
2682 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2683 continue;
2684 }
2685 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2686 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2687
2688 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2689 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2690 }
2691 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2692 }
2693
2694 static int transport_clear_lun_thread(void *p)
2695 {
2696 struct se_lun *lun = p;
2697
2698 __transport_clear_lun_from_sessions(lun);
2699 complete(&lun->lun_shutdown_comp);
2700
2701 return 0;
2702 }
2703
2704 int transport_clear_lun_from_sessions(struct se_lun *lun)
2705 {
2706 struct task_struct *kt;
2707
2708 kt = kthread_run(transport_clear_lun_thread, lun,
2709 "tcm_cl_%u", lun->unpacked_lun);
2710 if (IS_ERR(kt)) {
2711 pr_err("Unable to start clear_lun thread\n");
2712 return PTR_ERR(kt);
2713 }
2714 wait_for_completion(&lun->lun_shutdown_comp);
2715
2716 return 0;
2717 }
2718
2719 /**
2720 * transport_wait_for_tasks - wait for completion to occur
2721 * @cmd: command to wait
2722 *
2723 * Called from frontend fabric context to wait for storage engine
2724 * to pause and/or release frontend generated struct se_cmd.
2725 */
2726 bool transport_wait_for_tasks(struct se_cmd *cmd)
2727 {
2728 unsigned long flags;
2729
2730 spin_lock_irqsave(&cmd->t_state_lock, flags);
2731 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2732 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2733 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2734 return false;
2735 }
2736
2737 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2738 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2739 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2740 return false;
2741 }
2742 /*
2743 * If we are already stopped due to an external event (ie: LUN shutdown)
2744 * sleep until the connection can have the passed struct se_cmd back.
2745 * The cmd->transport_lun_stopped_sem will be upped by
2746 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2747 * has completed its operation on the struct se_cmd.
2748 */
2749 if (cmd->transport_state & CMD_T_LUN_STOP) {
2750 pr_debug("wait_for_tasks: Stopping"
2751 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2752 "_stop_comp); for ITT: 0x%08x\n",
2753 cmd->se_tfo->get_task_tag(cmd));
2754 /*
2755 * There is a special case for WRITES where a FE exception +
2756 * LUN shutdown means ConfigFS context is still sleeping on
2757 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2758 * We go ahead and up transport_lun_stop_comp just to be sure
2759 * here.
2760 */
2761 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2762 complete(&cmd->transport_lun_stop_comp);
2763 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2764 spin_lock_irqsave(&cmd->t_state_lock, flags);
2765
2766 target_remove_from_state_list(cmd);
2767 /*
2768 * At this point, the frontend who was the originator of this
2769 * struct se_cmd, now owns the structure and can be released through
2770 * normal means below.
2771 */
2772 pr_debug("wait_for_tasks: Stopped"
2773 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2774 "stop_comp); for ITT: 0x%08x\n",
2775 cmd->se_tfo->get_task_tag(cmd));
2776
2777 cmd->transport_state &= ~CMD_T_LUN_STOP;
2778 }
2779
2780 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2781 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2782 return false;
2783 }
2784
2785 cmd->transport_state |= CMD_T_STOP;
2786
2787 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2788 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2789 cmd, cmd->se_tfo->get_task_tag(cmd),
2790 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2791
2792 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2793
2794 wait_for_completion(&cmd->t_transport_stop_comp);
2795
2796 spin_lock_irqsave(&cmd->t_state_lock, flags);
2797 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2798
2799 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
2800 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2801 cmd->se_tfo->get_task_tag(cmd));
2802
2803 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2804
2805 return true;
2806 }
2807 EXPORT_SYMBOL(transport_wait_for_tasks);
2808
2809 static int transport_get_sense_codes(
2810 struct se_cmd *cmd,
2811 u8 *asc,
2812 u8 *ascq)
2813 {
2814 *asc = cmd->scsi_asc;
2815 *ascq = cmd->scsi_ascq;
2816
2817 return 0;
2818 }
2819
2820 static int transport_set_sense_codes(
2821 struct se_cmd *cmd,
2822 u8 asc,
2823 u8 ascq)
2824 {
2825 cmd->scsi_asc = asc;
2826 cmd->scsi_ascq = ascq;
2827
2828 return 0;
2829 }
2830
2831 int transport_send_check_condition_and_sense(
2832 struct se_cmd *cmd,
2833 u8 reason,
2834 int from_transport)
2835 {
2836 unsigned char *buffer = cmd->sense_buffer;
2837 unsigned long flags;
2838 int offset;
2839 u8 asc = 0, ascq = 0;
2840
2841 spin_lock_irqsave(&cmd->t_state_lock, flags);
2842 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2843 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2844 return 0;
2845 }
2846 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2847 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2848
2849 if (!reason && from_transport)
2850 goto after_reason;
2851
2852 if (!from_transport)
2853 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2854 /*
2855 * Data Segment and SenseLength of the fabric response PDU.
2856 *
2857 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2858 * from include/scsi/scsi_cmnd.h
2859 */
2860 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2861 TRANSPORT_SENSE_BUFFER);
2862 /*
2863 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2864 * SENSE KEY values from include/scsi/scsi.h
2865 */
2866 switch (reason) {
2867 case TCM_NON_EXISTENT_LUN:
2868 /* CURRENT ERROR */
2869 buffer[offset] = 0x70;
2870 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2871 /* ILLEGAL REQUEST */
2872 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2873 /* LOGICAL UNIT NOT SUPPORTED */
2874 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2875 break;
2876 case TCM_UNSUPPORTED_SCSI_OPCODE:
2877 case TCM_SECTOR_COUNT_TOO_MANY:
2878 /* CURRENT ERROR */
2879 buffer[offset] = 0x70;
2880 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2881 /* ILLEGAL REQUEST */
2882 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2883 /* INVALID COMMAND OPERATION CODE */
2884 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2885 break;
2886 case TCM_UNKNOWN_MODE_PAGE:
2887 /* CURRENT ERROR */
2888 buffer[offset] = 0x70;
2889 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2890 /* ILLEGAL REQUEST */
2891 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2892 /* INVALID FIELD IN CDB */
2893 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2894 break;
2895 case TCM_CHECK_CONDITION_ABORT_CMD:
2896 /* CURRENT ERROR */
2897 buffer[offset] = 0x70;
2898 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2899 /* ABORTED COMMAND */
2900 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2901 /* BUS DEVICE RESET FUNCTION OCCURRED */
2902 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2903 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2904 break;
2905 case TCM_INCORRECT_AMOUNT_OF_DATA:
2906 /* CURRENT ERROR */
2907 buffer[offset] = 0x70;
2908 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2909 /* ABORTED COMMAND */
2910 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2911 /* WRITE ERROR */
2912 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2913 /* NOT ENOUGH UNSOLICITED DATA */
2914 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2915 break;
2916 case TCM_INVALID_CDB_FIELD:
2917 /* CURRENT ERROR */
2918 buffer[offset] = 0x70;
2919 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2920 /* ILLEGAL REQUEST */
2921 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2922 /* INVALID FIELD IN CDB */
2923 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2924 break;
2925 case TCM_INVALID_PARAMETER_LIST:
2926 /* CURRENT ERROR */
2927 buffer[offset] = 0x70;
2928 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2929 /* ILLEGAL REQUEST */
2930 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2931 /* INVALID FIELD IN PARAMETER LIST */
2932 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2933 break;
2934 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2935 /* CURRENT ERROR */
2936 buffer[offset] = 0x70;
2937 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2938 /* ABORTED COMMAND */
2939 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2940 /* WRITE ERROR */
2941 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2942 /* UNEXPECTED_UNSOLICITED_DATA */
2943 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2944 break;
2945 case TCM_SERVICE_CRC_ERROR:
2946 /* CURRENT ERROR */
2947 buffer[offset] = 0x70;
2948 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2949 /* ABORTED COMMAND */
2950 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2951 /* PROTOCOL SERVICE CRC ERROR */
2952 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2953 /* N/A */
2954 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2955 break;
2956 case TCM_SNACK_REJECTED:
2957 /* CURRENT ERROR */
2958 buffer[offset] = 0x70;
2959 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2960 /* ABORTED COMMAND */
2961 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2962 /* READ ERROR */
2963 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2964 /* FAILED RETRANSMISSION REQUEST */
2965 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2966 break;
2967 case TCM_WRITE_PROTECTED:
2968 /* CURRENT ERROR */
2969 buffer[offset] = 0x70;
2970 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2971 /* DATA PROTECT */
2972 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2973 /* WRITE PROTECTED */
2974 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2975 break;
2976 case TCM_ADDRESS_OUT_OF_RANGE:
2977 /* CURRENT ERROR */
2978 buffer[offset] = 0x70;
2979 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2980 /* ILLEGAL REQUEST */
2981 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2982 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2983 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
2984 break;
2985 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2986 /* CURRENT ERROR */
2987 buffer[offset] = 0x70;
2988 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2989 /* UNIT ATTENTION */
2990 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2991 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2992 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2993 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2994 break;
2995 case TCM_CHECK_CONDITION_NOT_READY:
2996 /* CURRENT ERROR */
2997 buffer[offset] = 0x70;
2998 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2999 /* Not Ready */
3000 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3001 transport_get_sense_codes(cmd, &asc, &ascq);
3002 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3003 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3004 break;
3005 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3006 default:
3007 /* CURRENT ERROR */
3008 buffer[offset] = 0x70;
3009 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3010 /* ILLEGAL REQUEST */
3011 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3012 /* LOGICAL UNIT COMMUNICATION FAILURE */
3013 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3014 break;
3015 }
3016 /*
3017 * This code uses linux/include/scsi/scsi.h SAM status codes!
3018 */
3019 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3020 /*
3021 * Automatically padded, this value is encoded in the fabric's
3022 * data_length response PDU containing the SCSI defined sense data.
3023 */
3024 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
3025
3026 after_reason:
3027 return cmd->se_tfo->queue_status(cmd);
3028 }
3029 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3030
3031 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3032 {
3033 int ret = 0;
3034
3035 if (cmd->transport_state & CMD_T_ABORTED) {
3036 if (!send_status ||
3037 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3038 return 1;
3039
3040 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3041 " status for CDB: 0x%02x ITT: 0x%08x\n",
3042 cmd->t_task_cdb[0],
3043 cmd->se_tfo->get_task_tag(cmd));
3044
3045 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3046 cmd->se_tfo->queue_status(cmd);
3047 ret = 1;
3048 }
3049 return ret;
3050 }
3051 EXPORT_SYMBOL(transport_check_aborted_status);
3052
3053 void transport_send_task_abort(struct se_cmd *cmd)
3054 {
3055 unsigned long flags;
3056
3057 spin_lock_irqsave(&cmd->t_state_lock, flags);
3058 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3059 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3060 return;
3061 }
3062 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3063
3064 /*
3065 * If there are still expected incoming fabric WRITEs, we wait
3066 * until until they have completed before sending a TASK_ABORTED
3067 * response. This response with TASK_ABORTED status will be
3068 * queued back to fabric module by transport_check_aborted_status().
3069 */
3070 if (cmd->data_direction == DMA_TO_DEVICE) {
3071 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3072 cmd->transport_state |= CMD_T_ABORTED;
3073 smp_mb__after_atomic_inc();
3074 }
3075 }
3076 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3077
3078 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3079 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3080 cmd->se_tfo->get_task_tag(cmd));
3081
3082 cmd->se_tfo->queue_status(cmd);
3083 }
3084
3085 static void target_tmr_work(struct work_struct *work)
3086 {
3087 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3088 struct se_device *dev = cmd->se_dev;
3089 struct se_tmr_req *tmr = cmd->se_tmr_req;
3090 int ret;
3091
3092 switch (tmr->function) {
3093 case TMR_ABORT_TASK:
3094 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3095 break;
3096 case TMR_ABORT_TASK_SET:
3097 case TMR_CLEAR_ACA:
3098 case TMR_CLEAR_TASK_SET:
3099 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3100 break;
3101 case TMR_LUN_RESET:
3102 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3103 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3104 TMR_FUNCTION_REJECTED;
3105 break;
3106 case TMR_TARGET_WARM_RESET:
3107 tmr->response = TMR_FUNCTION_REJECTED;
3108 break;
3109 case TMR_TARGET_COLD_RESET:
3110 tmr->response = TMR_FUNCTION_REJECTED;
3111 break;
3112 default:
3113 pr_err("Uknown TMR function: 0x%02x.\n",
3114 tmr->function);
3115 tmr->response = TMR_FUNCTION_REJECTED;
3116 break;
3117 }
3118
3119 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3120 cmd->se_tfo->queue_tm_rsp(cmd);
3121
3122 transport_cmd_check_stop_to_fabric(cmd);
3123 }
3124
3125 int transport_generic_handle_tmr(
3126 struct se_cmd *cmd)
3127 {
3128 INIT_WORK(&cmd->work, target_tmr_work);
3129 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3130 return 0;
3131 }
3132 EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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