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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/renesas...
[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 if (cmd->data_direction == DMA_TO_DEVICE) {
1169 pr_err("Rejecting underflow/overflow"
1170 " WRITE data\n");
1171 goto out_invalid_cdb_field;
1172 }
1173 /*
1174 * Reject READ_* or WRITE_* with overflow/underflow for
1175 * type SCF_SCSI_DATA_CDB.
1176 */
1177 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1178 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1179 " CDB on non 512-byte sector setup subsystem"
1180 " plugin: %s\n", dev->transport->name);
1181 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1182 goto out_invalid_cdb_field;
1183 }
1184
1185 if (size > cmd->data_length) {
1186 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1187 cmd->residual_count = (size - cmd->data_length);
1188 } else {
1189 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1190 cmd->residual_count = (cmd->data_length - size);
1191 }
1192 cmd->data_length = size;
1193 }
1194
1195 return 0;
1196
1197 out_invalid_cdb_field:
1198 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1199 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1200 return -EINVAL;
1201 }
1202
1203 /*
1204 * Used by fabric modules containing a local struct se_cmd within their
1205 * fabric dependent per I/O descriptor.
1206 */
1207 void transport_init_se_cmd(
1208 struct se_cmd *cmd,
1209 struct target_core_fabric_ops *tfo,
1210 struct se_session *se_sess,
1211 u32 data_length,
1212 int data_direction,
1213 int task_attr,
1214 unsigned char *sense_buffer)
1215 {
1216 INIT_LIST_HEAD(&cmd->se_lun_node);
1217 INIT_LIST_HEAD(&cmd->se_delayed_node);
1218 INIT_LIST_HEAD(&cmd->se_qf_node);
1219 INIT_LIST_HEAD(&cmd->se_cmd_list);
1220 INIT_LIST_HEAD(&cmd->state_list);
1221 init_completion(&cmd->transport_lun_fe_stop_comp);
1222 init_completion(&cmd->transport_lun_stop_comp);
1223 init_completion(&cmd->t_transport_stop_comp);
1224 init_completion(&cmd->cmd_wait_comp);
1225 init_completion(&cmd->task_stop_comp);
1226 spin_lock_init(&cmd->t_state_lock);
1227 cmd->transport_state = CMD_T_DEV_ACTIVE;
1228
1229 cmd->se_tfo = tfo;
1230 cmd->se_sess = se_sess;
1231 cmd->data_length = data_length;
1232 cmd->data_direction = data_direction;
1233 cmd->sam_task_attr = task_attr;
1234 cmd->sense_buffer = sense_buffer;
1235
1236 cmd->state_active = false;
1237 }
1238 EXPORT_SYMBOL(transport_init_se_cmd);
1239
1240 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1241 {
1242 /*
1243 * Check if SAM Task Attribute emulation is enabled for this
1244 * struct se_device storage object
1245 */
1246 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1247 return 0;
1248
1249 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1250 pr_debug("SAM Task Attribute ACA"
1251 " emulation is not supported\n");
1252 return -EINVAL;
1253 }
1254 /*
1255 * Used to determine when ORDERED commands should go from
1256 * Dormant to Active status.
1257 */
1258 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1259 smp_mb__after_atomic_inc();
1260 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1261 cmd->se_ordered_id, cmd->sam_task_attr,
1262 cmd->se_dev->transport->name);
1263 return 0;
1264 }
1265
1266 /* target_setup_cmd_from_cdb():
1267 *
1268 * Called from fabric RX Thread.
1269 */
1270 int target_setup_cmd_from_cdb(
1271 struct se_cmd *cmd,
1272 unsigned char *cdb)
1273 {
1274 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1275 u32 pr_reg_type = 0;
1276 u8 alua_ascq = 0;
1277 unsigned long flags;
1278 int ret;
1279
1280 /*
1281 * Ensure that the received CDB is less than the max (252 + 8) bytes
1282 * for VARIABLE_LENGTH_CMD
1283 */
1284 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1285 pr_err("Received SCSI CDB with command_size: %d that"
1286 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1287 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1288 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1289 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1290 return -EINVAL;
1291 }
1292 /*
1293 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1294 * allocate the additional extended CDB buffer now.. Otherwise
1295 * setup the pointer from __t_task_cdb to t_task_cdb.
1296 */
1297 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1298 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1299 GFP_KERNEL);
1300 if (!cmd->t_task_cdb) {
1301 pr_err("Unable to allocate cmd->t_task_cdb"
1302 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1303 scsi_command_size(cdb),
1304 (unsigned long)sizeof(cmd->__t_task_cdb));
1305 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1306 cmd->scsi_sense_reason =
1307 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1308 return -ENOMEM;
1309 }
1310 } else
1311 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1312 /*
1313 * Copy the original CDB into cmd->
1314 */
1315 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1316
1317 /*
1318 * Check for an existing UNIT ATTENTION condition
1319 */
1320 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1321 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1322 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1323 return -EINVAL;
1324 }
1325
1326 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1327 if (ret != 0) {
1328 /*
1329 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1330 * The ALUA additional sense code qualifier (ASCQ) is determined
1331 * by the ALUA primary or secondary access state..
1332 */
1333 if (ret > 0) {
1334 pr_debug("[%s]: ALUA TG Port not available, "
1335 "SenseKey: NOT_READY, ASC/ASCQ: "
1336 "0x04/0x%02x\n",
1337 cmd->se_tfo->get_fabric_name(), alua_ascq);
1338
1339 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1340 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1341 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1342 return -EINVAL;
1343 }
1344 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1345 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1346 return -EINVAL;
1347 }
1348
1349 /*
1350 * Check status for SPC-3 Persistent Reservations
1351 */
1352 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1353 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1354 cmd, cdb, pr_reg_type) != 0) {
1355 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1356 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1357 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1358 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1359 return -EBUSY;
1360 }
1361 /*
1362 * This means the CDB is allowed for the SCSI Initiator port
1363 * when said port is *NOT* holding the legacy SPC-2 or
1364 * SPC-3 Persistent Reservation.
1365 */
1366 }
1367
1368 ret = cmd->se_dev->transport->parse_cdb(cmd);
1369 if (ret < 0)
1370 return ret;
1371
1372 spin_lock_irqsave(&cmd->t_state_lock, flags);
1373 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1374 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1375
1376 /*
1377 * Check for SAM Task Attribute Emulation
1378 */
1379 if (transport_check_alloc_task_attr(cmd) < 0) {
1380 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1381 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1382 return -EINVAL;
1383 }
1384 spin_lock(&cmd->se_lun->lun_sep_lock);
1385 if (cmd->se_lun->lun_sep)
1386 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1387 spin_unlock(&cmd->se_lun->lun_sep_lock);
1388 return 0;
1389 }
1390 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1391
1392 /*
1393 * Used by fabric module frontends to queue tasks directly.
1394 * Many only be used from process context only
1395 */
1396 int transport_handle_cdb_direct(
1397 struct se_cmd *cmd)
1398 {
1399 int ret;
1400
1401 if (!cmd->se_lun) {
1402 dump_stack();
1403 pr_err("cmd->se_lun is NULL\n");
1404 return -EINVAL;
1405 }
1406 if (in_interrupt()) {
1407 dump_stack();
1408 pr_err("transport_generic_handle_cdb cannot be called"
1409 " from interrupt context\n");
1410 return -EINVAL;
1411 }
1412 /*
1413 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1414 * outstanding descriptors are handled correctly during shutdown via
1415 * transport_wait_for_tasks()
1416 *
1417 * Also, we don't take cmd->t_state_lock here as we only expect
1418 * this to be called for initial descriptor submission.
1419 */
1420 cmd->t_state = TRANSPORT_NEW_CMD;
1421 cmd->transport_state |= CMD_T_ACTIVE;
1422
1423 /*
1424 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1425 * so follow TRANSPORT_NEW_CMD processing thread context usage
1426 * and call transport_generic_request_failure() if necessary..
1427 */
1428 ret = transport_generic_new_cmd(cmd);
1429 if (ret < 0)
1430 transport_generic_request_failure(cmd);
1431
1432 return 0;
1433 }
1434 EXPORT_SYMBOL(transport_handle_cdb_direct);
1435
1436 /**
1437 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1438 *
1439 * @se_cmd: command descriptor to submit
1440 * @se_sess: associated se_sess for endpoint
1441 * @cdb: pointer to SCSI CDB
1442 * @sense: pointer to SCSI sense buffer
1443 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1444 * @data_length: fabric expected data transfer length
1445 * @task_addr: SAM task attribute
1446 * @data_dir: DMA data direction
1447 * @flags: flags for command submission from target_sc_flags_tables
1448 *
1449 * Returns non zero to signal active I/O shutdown failure. All other
1450 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1451 * but still return zero here.
1452 *
1453 * This may only be called from process context, and also currently
1454 * assumes internal allocation of fabric payload buffer by target-core.
1455 **/
1456 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1457 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1458 u32 data_length, int task_attr, int data_dir, int flags)
1459 {
1460 struct se_portal_group *se_tpg;
1461 int rc;
1462
1463 se_tpg = se_sess->se_tpg;
1464 BUG_ON(!se_tpg);
1465 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1466 BUG_ON(in_interrupt());
1467 /*
1468 * Initialize se_cmd for target operation. From this point
1469 * exceptions are handled by sending exception status via
1470 * target_core_fabric_ops->queue_status() callback
1471 */
1472 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1473 data_length, data_dir, task_attr, sense);
1474 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1475 se_cmd->unknown_data_length = 1;
1476 /*
1477 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1478 * se_sess->sess_cmd_list. A second kref_get here is necessary
1479 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1480 * kref_put() to happen during fabric packet acknowledgement.
1481 */
1482 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1483 if (rc)
1484 return rc;
1485 /*
1486 * Signal bidirectional data payloads to target-core
1487 */
1488 if (flags & TARGET_SCF_BIDI_OP)
1489 se_cmd->se_cmd_flags |= SCF_BIDI;
1490 /*
1491 * Locate se_lun pointer and attach it to struct se_cmd
1492 */
1493 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1494 transport_send_check_condition_and_sense(se_cmd,
1495 se_cmd->scsi_sense_reason, 0);
1496 target_put_sess_cmd(se_sess, se_cmd);
1497 return 0;
1498 }
1499
1500 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1501 if (rc != 0) {
1502 transport_generic_request_failure(se_cmd);
1503 return 0;
1504 }
1505
1506 /*
1507 * Check if we need to delay processing because of ALUA
1508 * Active/NonOptimized primary access state..
1509 */
1510 core_alua_check_nonop_delay(se_cmd);
1511
1512 transport_handle_cdb_direct(se_cmd);
1513 return 0;
1514 }
1515 EXPORT_SYMBOL(target_submit_cmd);
1516
1517 static void target_complete_tmr_failure(struct work_struct *work)
1518 {
1519 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1520
1521 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1522 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1523 transport_generic_free_cmd(se_cmd, 0);
1524 }
1525
1526 /**
1527 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1528 * for TMR CDBs
1529 *
1530 * @se_cmd: command descriptor to submit
1531 * @se_sess: associated se_sess for endpoint
1532 * @sense: pointer to SCSI sense buffer
1533 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1534 * @fabric_context: fabric context for TMR req
1535 * @tm_type: Type of TM request
1536 * @gfp: gfp type for caller
1537 * @tag: referenced task tag for TMR_ABORT_TASK
1538 * @flags: submit cmd flags
1539 *
1540 * Callable from all contexts.
1541 **/
1542
1543 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1544 unsigned char *sense, u32 unpacked_lun,
1545 void *fabric_tmr_ptr, unsigned char tm_type,
1546 gfp_t gfp, unsigned int tag, int flags)
1547 {
1548 struct se_portal_group *se_tpg;
1549 int ret;
1550
1551 se_tpg = se_sess->se_tpg;
1552 BUG_ON(!se_tpg);
1553
1554 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1555 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1556 /*
1557 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1558 * allocation failure.
1559 */
1560 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1561 if (ret < 0)
1562 return -ENOMEM;
1563
1564 if (tm_type == TMR_ABORT_TASK)
1565 se_cmd->se_tmr_req->ref_task_tag = tag;
1566
1567 /* See target_submit_cmd for commentary */
1568 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1569 if (ret) {
1570 core_tmr_release_req(se_cmd->se_tmr_req);
1571 return ret;
1572 }
1573
1574 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1575 if (ret) {
1576 /*
1577 * For callback during failure handling, push this work off
1578 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1579 */
1580 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1581 schedule_work(&se_cmd->work);
1582 return 0;
1583 }
1584 transport_generic_handle_tmr(se_cmd);
1585 return 0;
1586 }
1587 EXPORT_SYMBOL(target_submit_tmr);
1588
1589 /*
1590 * If the cmd is active, request it to be stopped and sleep until it
1591 * has completed.
1592 */
1593 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1594 {
1595 bool was_active = false;
1596
1597 if (cmd->transport_state & CMD_T_BUSY) {
1598 cmd->transport_state |= CMD_T_REQUEST_STOP;
1599 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1600
1601 pr_debug("cmd %p waiting to complete\n", cmd);
1602 wait_for_completion(&cmd->task_stop_comp);
1603 pr_debug("cmd %p stopped successfully\n", cmd);
1604
1605 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1606 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1607 cmd->transport_state &= ~CMD_T_BUSY;
1608 was_active = true;
1609 }
1610
1611 return was_active;
1612 }
1613
1614 /*
1615 * Handle SAM-esque emulation for generic transport request failures.
1616 */
1617 void transport_generic_request_failure(struct se_cmd *cmd)
1618 {
1619 int ret = 0;
1620
1621 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1622 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1623 cmd->t_task_cdb[0]);
1624 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1625 cmd->se_tfo->get_cmd_state(cmd),
1626 cmd->t_state, cmd->scsi_sense_reason);
1627 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1628 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1629 (cmd->transport_state & CMD_T_STOP) != 0,
1630 (cmd->transport_state & CMD_T_SENT) != 0);
1631
1632 /*
1633 * For SAM Task Attribute emulation for failed struct se_cmd
1634 */
1635 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1636 transport_complete_task_attr(cmd);
1637
1638 switch (cmd->scsi_sense_reason) {
1639 case TCM_NON_EXISTENT_LUN:
1640 case TCM_UNSUPPORTED_SCSI_OPCODE:
1641 case TCM_INVALID_CDB_FIELD:
1642 case TCM_INVALID_PARAMETER_LIST:
1643 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1644 case TCM_UNKNOWN_MODE_PAGE:
1645 case TCM_WRITE_PROTECTED:
1646 case TCM_ADDRESS_OUT_OF_RANGE:
1647 case TCM_CHECK_CONDITION_ABORT_CMD:
1648 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1649 case TCM_CHECK_CONDITION_NOT_READY:
1650 break;
1651 case TCM_RESERVATION_CONFLICT:
1652 /*
1653 * No SENSE Data payload for this case, set SCSI Status
1654 * and queue the response to $FABRIC_MOD.
1655 *
1656 * Uses linux/include/scsi/scsi.h SAM status codes defs
1657 */
1658 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1659 /*
1660 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1661 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1662 * CONFLICT STATUS.
1663 *
1664 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1665 */
1666 if (cmd->se_sess &&
1667 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1668 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1669 cmd->orig_fe_lun, 0x2C,
1670 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1671
1672 ret = cmd->se_tfo->queue_status(cmd);
1673 if (ret == -EAGAIN || ret == -ENOMEM)
1674 goto queue_full;
1675 goto check_stop;
1676 default:
1677 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1678 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1679 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1680 break;
1681 }
1682
1683 ret = transport_send_check_condition_and_sense(cmd,
1684 cmd->scsi_sense_reason, 0);
1685 if (ret == -EAGAIN || ret == -ENOMEM)
1686 goto queue_full;
1687
1688 check_stop:
1689 transport_lun_remove_cmd(cmd);
1690 if (!transport_cmd_check_stop_to_fabric(cmd))
1691 ;
1692 return;
1693
1694 queue_full:
1695 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1696 transport_handle_queue_full(cmd, cmd->se_dev);
1697 }
1698 EXPORT_SYMBOL(transport_generic_request_failure);
1699
1700 static void __target_execute_cmd(struct se_cmd *cmd)
1701 {
1702 int error = 0;
1703
1704 spin_lock_irq(&cmd->t_state_lock);
1705 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1706 spin_unlock_irq(&cmd->t_state_lock);
1707
1708 if (cmd->execute_cmd)
1709 error = cmd->execute_cmd(cmd);
1710
1711 if (error) {
1712 spin_lock_irq(&cmd->t_state_lock);
1713 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1714 spin_unlock_irq(&cmd->t_state_lock);
1715
1716 transport_generic_request_failure(cmd);
1717 }
1718 }
1719
1720 void target_execute_cmd(struct se_cmd *cmd)
1721 {
1722 struct se_device *dev = cmd->se_dev;
1723
1724 /*
1725 * If the received CDB has aleady been aborted stop processing it here.
1726 */
1727 if (transport_check_aborted_status(cmd, 1))
1728 return;
1729
1730 /*
1731 * Determine if IOCTL context caller in requesting the stopping of this
1732 * command for LUN shutdown purposes.
1733 */
1734 spin_lock_irq(&cmd->t_state_lock);
1735 if (cmd->transport_state & CMD_T_LUN_STOP) {
1736 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1737 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1738
1739 cmd->transport_state &= ~CMD_T_ACTIVE;
1740 spin_unlock_irq(&cmd->t_state_lock);
1741 complete(&cmd->transport_lun_stop_comp);
1742 return;
1743 }
1744 /*
1745 * Determine if frontend context caller is requesting the stopping of
1746 * this command for frontend exceptions.
1747 */
1748 if (cmd->transport_state & CMD_T_STOP) {
1749 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1750 __func__, __LINE__,
1751 cmd->se_tfo->get_task_tag(cmd));
1752
1753 spin_unlock_irq(&cmd->t_state_lock);
1754 complete(&cmd->t_transport_stop_comp);
1755 return;
1756 }
1757
1758 cmd->t_state = TRANSPORT_PROCESSING;
1759 spin_unlock_irq(&cmd->t_state_lock);
1760
1761 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1762 goto execute;
1763
1764 /*
1765 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1766 * to allow the passed struct se_cmd list of tasks to the front of the list.
1767 */
1768 switch (cmd->sam_task_attr) {
1769 case MSG_HEAD_TAG:
1770 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1771 "se_ordered_id: %u\n",
1772 cmd->t_task_cdb[0], cmd->se_ordered_id);
1773 goto execute;
1774 case MSG_ORDERED_TAG:
1775 atomic_inc(&dev->dev_ordered_sync);
1776 smp_mb__after_atomic_inc();
1777
1778 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1779 " se_ordered_id: %u\n",
1780 cmd->t_task_cdb[0], cmd->se_ordered_id);
1781
1782 /*
1783 * Execute an ORDERED command if no other older commands
1784 * exist that need to be completed first.
1785 */
1786 if (!atomic_read(&dev->simple_cmds))
1787 goto execute;
1788 break;
1789 default:
1790 /*
1791 * For SIMPLE and UNTAGGED Task Attribute commands
1792 */
1793 atomic_inc(&dev->simple_cmds);
1794 smp_mb__after_atomic_inc();
1795 break;
1796 }
1797
1798 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1799 spin_lock(&dev->delayed_cmd_lock);
1800 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1801 spin_unlock(&dev->delayed_cmd_lock);
1802
1803 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1804 " delayed CMD list, se_ordered_id: %u\n",
1805 cmd->t_task_cdb[0], cmd->sam_task_attr,
1806 cmd->se_ordered_id);
1807 return;
1808 }
1809
1810 execute:
1811 /*
1812 * Otherwise, no ORDERED task attributes exist..
1813 */
1814 __target_execute_cmd(cmd);
1815 }
1816 EXPORT_SYMBOL(target_execute_cmd);
1817
1818 /*
1819 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1820 */
1821 static int transport_get_sense_data(struct se_cmd *cmd)
1822 {
1823 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
1824 struct se_device *dev = cmd->se_dev;
1825 unsigned long flags;
1826 u32 offset = 0;
1827
1828 WARN_ON(!cmd->se_lun);
1829
1830 if (!dev)
1831 return 0;
1832
1833 spin_lock_irqsave(&cmd->t_state_lock, flags);
1834 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
1835 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1836 return 0;
1837 }
1838
1839 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
1840 goto out;
1841
1842 if (!dev->transport->get_sense_buffer) {
1843 pr_err("dev->transport->get_sense_buffer is NULL\n");
1844 goto out;
1845 }
1846
1847 sense_buffer = dev->transport->get_sense_buffer(cmd);
1848 if (!sense_buffer) {
1849 pr_err("ITT 0x%08x cmd %p: Unable to locate"
1850 " sense buffer for task with sense\n",
1851 cmd->se_tfo->get_task_tag(cmd), cmd);
1852 goto out;
1853 }
1854
1855 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1856
1857 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
1858
1859 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
1860
1861 /* Automatically padded */
1862 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
1863
1864 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
1865 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
1866 return 0;
1867
1868 out:
1869 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1870 return -1;
1871 }
1872
1873 /*
1874 * Process all commands up to the last received ORDERED task attribute which
1875 * requires another blocking boundary
1876 */
1877 static void target_restart_delayed_cmds(struct se_device *dev)
1878 {
1879 for (;;) {
1880 struct se_cmd *cmd;
1881
1882 spin_lock(&dev->delayed_cmd_lock);
1883 if (list_empty(&dev->delayed_cmd_list)) {
1884 spin_unlock(&dev->delayed_cmd_lock);
1885 break;
1886 }
1887
1888 cmd = list_entry(dev->delayed_cmd_list.next,
1889 struct se_cmd, se_delayed_node);
1890 list_del(&cmd->se_delayed_node);
1891 spin_unlock(&dev->delayed_cmd_lock);
1892
1893 __target_execute_cmd(cmd);
1894
1895 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1896 break;
1897 }
1898 }
1899
1900 /*
1901 * Called from I/O completion to determine which dormant/delayed
1902 * and ordered cmds need to have their tasks added to the execution queue.
1903 */
1904 static void transport_complete_task_attr(struct se_cmd *cmd)
1905 {
1906 struct se_device *dev = cmd->se_dev;
1907
1908 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1909 atomic_dec(&dev->simple_cmds);
1910 smp_mb__after_atomic_dec();
1911 dev->dev_cur_ordered_id++;
1912 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1913 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1914 cmd->se_ordered_id);
1915 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1916 dev->dev_cur_ordered_id++;
1917 pr_debug("Incremented dev_cur_ordered_id: %u for"
1918 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1919 cmd->se_ordered_id);
1920 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1921 atomic_dec(&dev->dev_ordered_sync);
1922 smp_mb__after_atomic_dec();
1923
1924 dev->dev_cur_ordered_id++;
1925 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1926 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1927 }
1928
1929 target_restart_delayed_cmds(dev);
1930 }
1931
1932 static void transport_complete_qf(struct se_cmd *cmd)
1933 {
1934 int ret = 0;
1935
1936 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1937 transport_complete_task_attr(cmd);
1938
1939 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1940 ret = cmd->se_tfo->queue_status(cmd);
1941 if (ret)
1942 goto out;
1943 }
1944
1945 switch (cmd->data_direction) {
1946 case DMA_FROM_DEVICE:
1947 ret = cmd->se_tfo->queue_data_in(cmd);
1948 break;
1949 case DMA_TO_DEVICE:
1950 if (cmd->t_bidi_data_sg) {
1951 ret = cmd->se_tfo->queue_data_in(cmd);
1952 if (ret < 0)
1953 break;
1954 }
1955 /* Fall through for DMA_TO_DEVICE */
1956 case DMA_NONE:
1957 ret = cmd->se_tfo->queue_status(cmd);
1958 break;
1959 default:
1960 break;
1961 }
1962
1963 out:
1964 if (ret < 0) {
1965 transport_handle_queue_full(cmd, cmd->se_dev);
1966 return;
1967 }
1968 transport_lun_remove_cmd(cmd);
1969 transport_cmd_check_stop_to_fabric(cmd);
1970 }
1971
1972 static void transport_handle_queue_full(
1973 struct se_cmd *cmd,
1974 struct se_device *dev)
1975 {
1976 spin_lock_irq(&dev->qf_cmd_lock);
1977 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1978 atomic_inc(&dev->dev_qf_count);
1979 smp_mb__after_atomic_inc();
1980 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1981
1982 schedule_work(&cmd->se_dev->qf_work_queue);
1983 }
1984
1985 static void target_complete_ok_work(struct work_struct *work)
1986 {
1987 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1988 int reason = 0, ret;
1989
1990 /*
1991 * Check if we need to move delayed/dormant tasks from cmds on the
1992 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1993 * Attribute.
1994 */
1995 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1996 transport_complete_task_attr(cmd);
1997 /*
1998 * Check to schedule QUEUE_FULL work, or execute an existing
1999 * cmd->transport_qf_callback()
2000 */
2001 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2002 schedule_work(&cmd->se_dev->qf_work_queue);
2003
2004 /*
2005 * Check if we need to retrieve a sense buffer from
2006 * the struct se_cmd in question.
2007 */
2008 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2009 if (transport_get_sense_data(cmd) < 0)
2010 reason = TCM_NON_EXISTENT_LUN;
2011
2012 if (cmd->scsi_status) {
2013 ret = transport_send_check_condition_and_sense(
2014 cmd, reason, 1);
2015 if (ret == -EAGAIN || ret == -ENOMEM)
2016 goto queue_full;
2017
2018 transport_lun_remove_cmd(cmd);
2019 transport_cmd_check_stop_to_fabric(cmd);
2020 return;
2021 }
2022 }
2023 /*
2024 * Check for a callback, used by amongst other things
2025 * XDWRITE_READ_10 emulation.
2026 */
2027 if (cmd->transport_complete_callback)
2028 cmd->transport_complete_callback(cmd);
2029
2030 switch (cmd->data_direction) {
2031 case DMA_FROM_DEVICE:
2032 spin_lock(&cmd->se_lun->lun_sep_lock);
2033 if (cmd->se_lun->lun_sep) {
2034 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2035 cmd->data_length;
2036 }
2037 spin_unlock(&cmd->se_lun->lun_sep_lock);
2038
2039 ret = cmd->se_tfo->queue_data_in(cmd);
2040 if (ret == -EAGAIN || ret == -ENOMEM)
2041 goto queue_full;
2042 break;
2043 case DMA_TO_DEVICE:
2044 spin_lock(&cmd->se_lun->lun_sep_lock);
2045 if (cmd->se_lun->lun_sep) {
2046 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2047 cmd->data_length;
2048 }
2049 spin_unlock(&cmd->se_lun->lun_sep_lock);
2050 /*
2051 * Check if we need to send READ payload for BIDI-COMMAND
2052 */
2053 if (cmd->t_bidi_data_sg) {
2054 spin_lock(&cmd->se_lun->lun_sep_lock);
2055 if (cmd->se_lun->lun_sep) {
2056 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2057 cmd->data_length;
2058 }
2059 spin_unlock(&cmd->se_lun->lun_sep_lock);
2060 ret = cmd->se_tfo->queue_data_in(cmd);
2061 if (ret == -EAGAIN || ret == -ENOMEM)
2062 goto queue_full;
2063 break;
2064 }
2065 /* Fall through for DMA_TO_DEVICE */
2066 case DMA_NONE:
2067 ret = cmd->se_tfo->queue_status(cmd);
2068 if (ret == -EAGAIN || ret == -ENOMEM)
2069 goto queue_full;
2070 break;
2071 default:
2072 break;
2073 }
2074
2075 transport_lun_remove_cmd(cmd);
2076 transport_cmd_check_stop_to_fabric(cmd);
2077 return;
2078
2079 queue_full:
2080 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2081 " data_direction: %d\n", cmd, cmd->data_direction);
2082 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2083 transport_handle_queue_full(cmd, cmd->se_dev);
2084 }
2085
2086 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2087 {
2088 struct scatterlist *sg;
2089 int count;
2090
2091 for_each_sg(sgl, sg, nents, count)
2092 __free_page(sg_page(sg));
2093
2094 kfree(sgl);
2095 }
2096
2097 static inline void transport_free_pages(struct se_cmd *cmd)
2098 {
2099 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2100 return;
2101
2102 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2103 cmd->t_data_sg = NULL;
2104 cmd->t_data_nents = 0;
2105
2106 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2107 cmd->t_bidi_data_sg = NULL;
2108 cmd->t_bidi_data_nents = 0;
2109 }
2110
2111 /**
2112 * transport_release_cmd - free a command
2113 * @cmd: command to free
2114 *
2115 * This routine unconditionally frees a command, and reference counting
2116 * or list removal must be done in the caller.
2117 */
2118 static void transport_release_cmd(struct se_cmd *cmd)
2119 {
2120 BUG_ON(!cmd->se_tfo);
2121
2122 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2123 core_tmr_release_req(cmd->se_tmr_req);
2124 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2125 kfree(cmd->t_task_cdb);
2126 /*
2127 * If this cmd has been setup with target_get_sess_cmd(), drop
2128 * the kref and call ->release_cmd() in kref callback.
2129 */
2130 if (cmd->check_release != 0) {
2131 target_put_sess_cmd(cmd->se_sess, cmd);
2132 return;
2133 }
2134 cmd->se_tfo->release_cmd(cmd);
2135 }
2136
2137 /**
2138 * transport_put_cmd - release a reference to a command
2139 * @cmd: command to release
2140 *
2141 * This routine releases our reference to the command and frees it if possible.
2142 */
2143 static void transport_put_cmd(struct se_cmd *cmd)
2144 {
2145 unsigned long flags;
2146
2147 spin_lock_irqsave(&cmd->t_state_lock, flags);
2148 if (atomic_read(&cmd->t_fe_count)) {
2149 if (!atomic_dec_and_test(&cmd->t_fe_count))
2150 goto out_busy;
2151 }
2152
2153 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2154 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2155 target_remove_from_state_list(cmd);
2156 }
2157 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2158
2159 transport_free_pages(cmd);
2160 transport_release_cmd(cmd);
2161 return;
2162 out_busy:
2163 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2164 }
2165
2166 /*
2167 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2168 * allocating in the core.
2169 * @cmd: Associated se_cmd descriptor
2170 * @mem: SGL style memory for TCM WRITE / READ
2171 * @sg_mem_num: Number of SGL elements
2172 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2173 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2174 *
2175 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2176 * of parameters.
2177 */
2178 int transport_generic_map_mem_to_cmd(
2179 struct se_cmd *cmd,
2180 struct scatterlist *sgl,
2181 u32 sgl_count,
2182 struct scatterlist *sgl_bidi,
2183 u32 sgl_bidi_count)
2184 {
2185 if (!sgl || !sgl_count)
2186 return 0;
2187
2188 /*
2189 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2190 * scatterlists already have been set to follow what the fabric
2191 * passes for the original expected data transfer length.
2192 */
2193 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2194 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2195 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2196 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2197 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2198 return -EINVAL;
2199 }
2200
2201 cmd->t_data_sg = sgl;
2202 cmd->t_data_nents = sgl_count;
2203
2204 if (sgl_bidi && sgl_bidi_count) {
2205 cmd->t_bidi_data_sg = sgl_bidi;
2206 cmd->t_bidi_data_nents = sgl_bidi_count;
2207 }
2208 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2209 return 0;
2210 }
2211 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2212
2213 void *transport_kmap_data_sg(struct se_cmd *cmd)
2214 {
2215 struct scatterlist *sg = cmd->t_data_sg;
2216 struct page **pages;
2217 int i;
2218
2219 BUG_ON(!sg);
2220 /*
2221 * We need to take into account a possible offset here for fabrics like
2222 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2223 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2224 */
2225 if (!cmd->t_data_nents)
2226 return NULL;
2227 else if (cmd->t_data_nents == 1)
2228 return kmap(sg_page(sg)) + sg->offset;
2229
2230 /* >1 page. use vmap */
2231 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2232 if (!pages)
2233 return NULL;
2234
2235 /* convert sg[] to pages[] */
2236 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2237 pages[i] = sg_page(sg);
2238 }
2239
2240 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2241 kfree(pages);
2242 if (!cmd->t_data_vmap)
2243 return NULL;
2244
2245 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2246 }
2247 EXPORT_SYMBOL(transport_kmap_data_sg);
2248
2249 void transport_kunmap_data_sg(struct se_cmd *cmd)
2250 {
2251 if (!cmd->t_data_nents) {
2252 return;
2253 } else if (cmd->t_data_nents == 1) {
2254 kunmap(sg_page(cmd->t_data_sg));
2255 return;
2256 }
2257
2258 vunmap(cmd->t_data_vmap);
2259 cmd->t_data_vmap = NULL;
2260 }
2261 EXPORT_SYMBOL(transport_kunmap_data_sg);
2262
2263 static int
2264 transport_generic_get_mem(struct se_cmd *cmd)
2265 {
2266 u32 length = cmd->data_length;
2267 unsigned int nents;
2268 struct page *page;
2269 gfp_t zero_flag;
2270 int i = 0;
2271
2272 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2273 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2274 if (!cmd->t_data_sg)
2275 return -ENOMEM;
2276
2277 cmd->t_data_nents = nents;
2278 sg_init_table(cmd->t_data_sg, nents);
2279
2280 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2281
2282 while (length) {
2283 u32 page_len = min_t(u32, length, PAGE_SIZE);
2284 page = alloc_page(GFP_KERNEL | zero_flag);
2285 if (!page)
2286 goto out;
2287
2288 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2289 length -= page_len;
2290 i++;
2291 }
2292 return 0;
2293
2294 out:
2295 while (i > 0) {
2296 i--;
2297 __free_page(sg_page(&cmd->t_data_sg[i]));
2298 }
2299 kfree(cmd->t_data_sg);
2300 cmd->t_data_sg = NULL;
2301 return -ENOMEM;
2302 }
2303
2304 /*
2305 * Allocate any required resources to execute the command. For writes we
2306 * might not have the payload yet, so notify the fabric via a call to
2307 * ->write_pending instead. Otherwise place it on the execution queue.
2308 */
2309 int transport_generic_new_cmd(struct se_cmd *cmd)
2310 {
2311 int ret = 0;
2312
2313 /*
2314 * Determine is the TCM fabric module has already allocated physical
2315 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2316 * beforehand.
2317 */
2318 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2319 cmd->data_length) {
2320 ret = transport_generic_get_mem(cmd);
2321 if (ret < 0)
2322 goto out_fail;
2323 }
2324 /*
2325 * If this command doesn't have any payload and we don't have to call
2326 * into the fabric for data transfers, go ahead and complete it right
2327 * away.
2328 */
2329 if (!cmd->data_length) {
2330 spin_lock_irq(&cmd->t_state_lock);
2331 cmd->t_state = TRANSPORT_COMPLETE;
2332 cmd->transport_state |= CMD_T_ACTIVE;
2333 spin_unlock_irq(&cmd->t_state_lock);
2334
2335 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2336 u8 ua_asc = 0, ua_ascq = 0;
2337
2338 core_scsi3_ua_clear_for_request_sense(cmd,
2339 &ua_asc, &ua_ascq);
2340 }
2341
2342 INIT_WORK(&cmd->work, target_complete_ok_work);
2343 queue_work(target_completion_wq, &cmd->work);
2344 return 0;
2345 }
2346
2347 atomic_inc(&cmd->t_fe_count);
2348
2349 /*
2350 * If this command is not a write we can execute it right here,
2351 * for write buffers we need to notify the fabric driver first
2352 * and let it call back once the write buffers are ready.
2353 */
2354 target_add_to_state_list(cmd);
2355 if (cmd->data_direction != DMA_TO_DEVICE) {
2356 target_execute_cmd(cmd);
2357 return 0;
2358 }
2359
2360 spin_lock_irq(&cmd->t_state_lock);
2361 cmd->t_state = TRANSPORT_WRITE_PENDING;
2362 spin_unlock_irq(&cmd->t_state_lock);
2363
2364 transport_cmd_check_stop(cmd, false);
2365
2366 ret = cmd->se_tfo->write_pending(cmd);
2367 if (ret == -EAGAIN || ret == -ENOMEM)
2368 goto queue_full;
2369
2370 if (ret < 0)
2371 return ret;
2372 return 1;
2373
2374 out_fail:
2375 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2376 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2377 return -EINVAL;
2378 queue_full:
2379 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2380 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2381 transport_handle_queue_full(cmd, cmd->se_dev);
2382 return 0;
2383 }
2384 EXPORT_SYMBOL(transport_generic_new_cmd);
2385
2386 static void transport_write_pending_qf(struct se_cmd *cmd)
2387 {
2388 int ret;
2389
2390 ret = cmd->se_tfo->write_pending(cmd);
2391 if (ret == -EAGAIN || ret == -ENOMEM) {
2392 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2393 cmd);
2394 transport_handle_queue_full(cmd, cmd->se_dev);
2395 }
2396 }
2397
2398 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2399 {
2400 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2401 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2402 transport_wait_for_tasks(cmd);
2403
2404 transport_release_cmd(cmd);
2405 } else {
2406 if (wait_for_tasks)
2407 transport_wait_for_tasks(cmd);
2408
2409 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2410
2411 if (cmd->se_lun)
2412 transport_lun_remove_cmd(cmd);
2413
2414 transport_put_cmd(cmd);
2415 }
2416 }
2417 EXPORT_SYMBOL(transport_generic_free_cmd);
2418
2419 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2420 * @se_sess: session to reference
2421 * @se_cmd: command descriptor to add
2422 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2423 */
2424 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2425 bool ack_kref)
2426 {
2427 unsigned long flags;
2428 int ret = 0;
2429
2430 kref_init(&se_cmd->cmd_kref);
2431 /*
2432 * Add a second kref if the fabric caller is expecting to handle
2433 * fabric acknowledgement that requires two target_put_sess_cmd()
2434 * invocations before se_cmd descriptor release.
2435 */
2436 if (ack_kref == true) {
2437 kref_get(&se_cmd->cmd_kref);
2438 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2439 }
2440
2441 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2442 if (se_sess->sess_tearing_down) {
2443 ret = -ESHUTDOWN;
2444 goto out;
2445 }
2446 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2447 se_cmd->check_release = 1;
2448
2449 out:
2450 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2451 return ret;
2452 }
2453
2454 static void target_release_cmd_kref(struct kref *kref)
2455 {
2456 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2457 struct se_session *se_sess = se_cmd->se_sess;
2458 unsigned long flags;
2459
2460 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2461 if (list_empty(&se_cmd->se_cmd_list)) {
2462 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2463 se_cmd->se_tfo->release_cmd(se_cmd);
2464 return;
2465 }
2466 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2467 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2468 complete(&se_cmd->cmd_wait_comp);
2469 return;
2470 }
2471 list_del(&se_cmd->se_cmd_list);
2472 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2473
2474 se_cmd->se_tfo->release_cmd(se_cmd);
2475 }
2476
2477 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2478 * @se_sess: session to reference
2479 * @se_cmd: command descriptor to drop
2480 */
2481 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2482 {
2483 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2484 }
2485 EXPORT_SYMBOL(target_put_sess_cmd);
2486
2487 /* target_sess_cmd_list_set_waiting - Flag all commands in
2488 * sess_cmd_list to complete cmd_wait_comp. Set
2489 * sess_tearing_down so no more commands are queued.
2490 * @se_sess: session to flag
2491 */
2492 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2493 {
2494 struct se_cmd *se_cmd;
2495 unsigned long flags;
2496
2497 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2498
2499 WARN_ON(se_sess->sess_tearing_down);
2500 se_sess->sess_tearing_down = 1;
2501
2502 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2503 se_cmd->cmd_wait_set = 1;
2504
2505 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2506 }
2507 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2508
2509 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2510 * @se_sess: session to wait for active I/O
2511 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2512 */
2513 void target_wait_for_sess_cmds(
2514 struct se_session *se_sess,
2515 int wait_for_tasks)
2516 {
2517 struct se_cmd *se_cmd, *tmp_cmd;
2518 bool rc = false;
2519
2520 list_for_each_entry_safe(se_cmd, tmp_cmd,
2521 &se_sess->sess_cmd_list, se_cmd_list) {
2522 list_del(&se_cmd->se_cmd_list);
2523
2524 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2525 " %d\n", se_cmd, se_cmd->t_state,
2526 se_cmd->se_tfo->get_cmd_state(se_cmd));
2527
2528 if (wait_for_tasks) {
2529 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2530 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2531 se_cmd->se_tfo->get_cmd_state(se_cmd));
2532
2533 rc = transport_wait_for_tasks(se_cmd);
2534
2535 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2536 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2537 se_cmd->se_tfo->get_cmd_state(se_cmd));
2538 }
2539
2540 if (!rc) {
2541 wait_for_completion(&se_cmd->cmd_wait_comp);
2542 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2543 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2544 se_cmd->se_tfo->get_cmd_state(se_cmd));
2545 }
2546
2547 se_cmd->se_tfo->release_cmd(se_cmd);
2548 }
2549 }
2550 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2551
2552 /* transport_lun_wait_for_tasks():
2553 *
2554 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2555 * an struct se_lun to be successfully shutdown.
2556 */
2557 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2558 {
2559 unsigned long flags;
2560 int ret = 0;
2561
2562 /*
2563 * If the frontend has already requested this struct se_cmd to
2564 * be stopped, we can safely ignore this struct se_cmd.
2565 */
2566 spin_lock_irqsave(&cmd->t_state_lock, flags);
2567 if (cmd->transport_state & CMD_T_STOP) {
2568 cmd->transport_state &= ~CMD_T_LUN_STOP;
2569
2570 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2571 cmd->se_tfo->get_task_tag(cmd));
2572 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2573 transport_cmd_check_stop(cmd, false);
2574 return -EPERM;
2575 }
2576 cmd->transport_state |= CMD_T_LUN_FE_STOP;
2577 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2578
2579 // XXX: audit task_flags checks.
2580 spin_lock_irqsave(&cmd->t_state_lock, flags);
2581 if ((cmd->transport_state & CMD_T_BUSY) &&
2582 (cmd->transport_state & CMD_T_SENT)) {
2583 if (!target_stop_cmd(cmd, &flags))
2584 ret++;
2585 }
2586 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2587
2588 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2589 " %d\n", cmd, ret);
2590 if (!ret) {
2591 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2592 cmd->se_tfo->get_task_tag(cmd));
2593 wait_for_completion(&cmd->transport_lun_stop_comp);
2594 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2595 cmd->se_tfo->get_task_tag(cmd));
2596 }
2597
2598 return 0;
2599 }
2600
2601 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2602 {
2603 struct se_cmd *cmd = NULL;
2604 unsigned long lun_flags, cmd_flags;
2605 /*
2606 * Do exception processing and return CHECK_CONDITION status to the
2607 * Initiator Port.
2608 */
2609 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2610 while (!list_empty(&lun->lun_cmd_list)) {
2611 cmd = list_first_entry(&lun->lun_cmd_list,
2612 struct se_cmd, se_lun_node);
2613 list_del_init(&cmd->se_lun_node);
2614
2615 spin_lock(&cmd->t_state_lock);
2616 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2617 "_lun_stop for ITT: 0x%08x\n",
2618 cmd->se_lun->unpacked_lun,
2619 cmd->se_tfo->get_task_tag(cmd));
2620 cmd->transport_state |= CMD_T_LUN_STOP;
2621 spin_unlock(&cmd->t_state_lock);
2622
2623 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2624
2625 if (!cmd->se_lun) {
2626 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2627 cmd->se_tfo->get_task_tag(cmd),
2628 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2629 BUG();
2630 }
2631 /*
2632 * If the Storage engine still owns the iscsi_cmd_t, determine
2633 * and/or stop its context.
2634 */
2635 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2636 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2637 cmd->se_tfo->get_task_tag(cmd));
2638
2639 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2640 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2641 continue;
2642 }
2643
2644 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2645 "_wait_for_tasks(): SUCCESS\n",
2646 cmd->se_lun->unpacked_lun,
2647 cmd->se_tfo->get_task_tag(cmd));
2648
2649 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2650 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2651 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2652 goto check_cond;
2653 }
2654 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2655 target_remove_from_state_list(cmd);
2656 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2657
2658 /*
2659 * The Storage engine stopped this struct se_cmd before it was
2660 * send to the fabric frontend for delivery back to the
2661 * Initiator Node. Return this SCSI CDB back with an
2662 * CHECK_CONDITION status.
2663 */
2664 check_cond:
2665 transport_send_check_condition_and_sense(cmd,
2666 TCM_NON_EXISTENT_LUN, 0);
2667 /*
2668 * If the fabric frontend is waiting for this iscsi_cmd_t to
2669 * be released, notify the waiting thread now that LU has
2670 * finished accessing it.
2671 */
2672 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2673 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2674 pr_debug("SE_LUN[%d] - Detected FE stop for"
2675 " struct se_cmd: %p ITT: 0x%08x\n",
2676 lun->unpacked_lun,
2677 cmd, cmd->se_tfo->get_task_tag(cmd));
2678
2679 spin_unlock_irqrestore(&cmd->t_state_lock,
2680 cmd_flags);
2681 transport_cmd_check_stop(cmd, false);
2682 complete(&cmd->transport_lun_fe_stop_comp);
2683 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2684 continue;
2685 }
2686 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2687 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2688
2689 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2690 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2691 }
2692 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2693 }
2694
2695 static int transport_clear_lun_thread(void *p)
2696 {
2697 struct se_lun *lun = p;
2698
2699 __transport_clear_lun_from_sessions(lun);
2700 complete(&lun->lun_shutdown_comp);
2701
2702 return 0;
2703 }
2704
2705 int transport_clear_lun_from_sessions(struct se_lun *lun)
2706 {
2707 struct task_struct *kt;
2708
2709 kt = kthread_run(transport_clear_lun_thread, lun,
2710 "tcm_cl_%u", lun->unpacked_lun);
2711 if (IS_ERR(kt)) {
2712 pr_err("Unable to start clear_lun thread\n");
2713 return PTR_ERR(kt);
2714 }
2715 wait_for_completion(&lun->lun_shutdown_comp);
2716
2717 return 0;
2718 }
2719
2720 /**
2721 * transport_wait_for_tasks - wait for completion to occur
2722 * @cmd: command to wait
2723 *
2724 * Called from frontend fabric context to wait for storage engine
2725 * to pause and/or release frontend generated struct se_cmd.
2726 */
2727 bool transport_wait_for_tasks(struct se_cmd *cmd)
2728 {
2729 unsigned long flags;
2730
2731 spin_lock_irqsave(&cmd->t_state_lock, flags);
2732 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2733 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2734 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2735 return false;
2736 }
2737
2738 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2739 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2740 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2741 return false;
2742 }
2743 /*
2744 * If we are already stopped due to an external event (ie: LUN shutdown)
2745 * sleep until the connection can have the passed struct se_cmd back.
2746 * The cmd->transport_lun_stopped_sem will be upped by
2747 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2748 * has completed its operation on the struct se_cmd.
2749 */
2750 if (cmd->transport_state & CMD_T_LUN_STOP) {
2751 pr_debug("wait_for_tasks: Stopping"
2752 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2753 "_stop_comp); for ITT: 0x%08x\n",
2754 cmd->se_tfo->get_task_tag(cmd));
2755 /*
2756 * There is a special case for WRITES where a FE exception +
2757 * LUN shutdown means ConfigFS context is still sleeping on
2758 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2759 * We go ahead and up transport_lun_stop_comp just to be sure
2760 * here.
2761 */
2762 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2763 complete(&cmd->transport_lun_stop_comp);
2764 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2765 spin_lock_irqsave(&cmd->t_state_lock, flags);
2766
2767 target_remove_from_state_list(cmd);
2768 /*
2769 * At this point, the frontend who was the originator of this
2770 * struct se_cmd, now owns the structure and can be released through
2771 * normal means below.
2772 */
2773 pr_debug("wait_for_tasks: Stopped"
2774 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2775 "stop_comp); for ITT: 0x%08x\n",
2776 cmd->se_tfo->get_task_tag(cmd));
2777
2778 cmd->transport_state &= ~CMD_T_LUN_STOP;
2779 }
2780
2781 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2782 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2783 return false;
2784 }
2785
2786 cmd->transport_state |= CMD_T_STOP;
2787
2788 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2789 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2790 cmd, cmd->se_tfo->get_task_tag(cmd),
2791 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2792
2793 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2794
2795 wait_for_completion(&cmd->t_transport_stop_comp);
2796
2797 spin_lock_irqsave(&cmd->t_state_lock, flags);
2798 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2799
2800 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
2801 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2802 cmd->se_tfo->get_task_tag(cmd));
2803
2804 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2805
2806 return true;
2807 }
2808 EXPORT_SYMBOL(transport_wait_for_tasks);
2809
2810 static int transport_get_sense_codes(
2811 struct se_cmd *cmd,
2812 u8 *asc,
2813 u8 *ascq)
2814 {
2815 *asc = cmd->scsi_asc;
2816 *ascq = cmd->scsi_ascq;
2817
2818 return 0;
2819 }
2820
2821 static int transport_set_sense_codes(
2822 struct se_cmd *cmd,
2823 u8 asc,
2824 u8 ascq)
2825 {
2826 cmd->scsi_asc = asc;
2827 cmd->scsi_ascq = ascq;
2828
2829 return 0;
2830 }
2831
2832 int transport_send_check_condition_and_sense(
2833 struct se_cmd *cmd,
2834 u8 reason,
2835 int from_transport)
2836 {
2837 unsigned char *buffer = cmd->sense_buffer;
2838 unsigned long flags;
2839 int offset;
2840 u8 asc = 0, ascq = 0;
2841
2842 spin_lock_irqsave(&cmd->t_state_lock, flags);
2843 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2844 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2845 return 0;
2846 }
2847 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2848 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2849
2850 if (!reason && from_transport)
2851 goto after_reason;
2852
2853 if (!from_transport)
2854 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2855 /*
2856 * Data Segment and SenseLength of the fabric response PDU.
2857 *
2858 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2859 * from include/scsi/scsi_cmnd.h
2860 */
2861 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2862 TRANSPORT_SENSE_BUFFER);
2863 /*
2864 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2865 * SENSE KEY values from include/scsi/scsi.h
2866 */
2867 switch (reason) {
2868 case TCM_NON_EXISTENT_LUN:
2869 /* CURRENT ERROR */
2870 buffer[offset] = 0x70;
2871 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2872 /* ILLEGAL REQUEST */
2873 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2874 /* LOGICAL UNIT NOT SUPPORTED */
2875 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2876 break;
2877 case TCM_UNSUPPORTED_SCSI_OPCODE:
2878 case TCM_SECTOR_COUNT_TOO_MANY:
2879 /* CURRENT ERROR */
2880 buffer[offset] = 0x70;
2881 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2882 /* ILLEGAL REQUEST */
2883 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2884 /* INVALID COMMAND OPERATION CODE */
2885 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2886 break;
2887 case TCM_UNKNOWN_MODE_PAGE:
2888 /* CURRENT ERROR */
2889 buffer[offset] = 0x70;
2890 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2891 /* ILLEGAL REQUEST */
2892 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2893 /* INVALID FIELD IN CDB */
2894 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2895 break;
2896 case TCM_CHECK_CONDITION_ABORT_CMD:
2897 /* CURRENT ERROR */
2898 buffer[offset] = 0x70;
2899 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2900 /* ABORTED COMMAND */
2901 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2902 /* BUS DEVICE RESET FUNCTION OCCURRED */
2903 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2904 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2905 break;
2906 case TCM_INCORRECT_AMOUNT_OF_DATA:
2907 /* CURRENT ERROR */
2908 buffer[offset] = 0x70;
2909 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2910 /* ABORTED COMMAND */
2911 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2912 /* WRITE ERROR */
2913 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2914 /* NOT ENOUGH UNSOLICITED DATA */
2915 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2916 break;
2917 case TCM_INVALID_CDB_FIELD:
2918 /* CURRENT ERROR */
2919 buffer[offset] = 0x70;
2920 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2921 /* ILLEGAL REQUEST */
2922 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2923 /* INVALID FIELD IN CDB */
2924 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2925 break;
2926 case TCM_INVALID_PARAMETER_LIST:
2927 /* CURRENT ERROR */
2928 buffer[offset] = 0x70;
2929 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2930 /* ILLEGAL REQUEST */
2931 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2932 /* INVALID FIELD IN PARAMETER LIST */
2933 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2934 break;
2935 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2936 /* CURRENT ERROR */
2937 buffer[offset] = 0x70;
2938 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2939 /* ABORTED COMMAND */
2940 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2941 /* WRITE ERROR */
2942 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2943 /* UNEXPECTED_UNSOLICITED_DATA */
2944 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2945 break;
2946 case TCM_SERVICE_CRC_ERROR:
2947 /* CURRENT ERROR */
2948 buffer[offset] = 0x70;
2949 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2950 /* ABORTED COMMAND */
2951 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2952 /* PROTOCOL SERVICE CRC ERROR */
2953 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2954 /* N/A */
2955 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2956 break;
2957 case TCM_SNACK_REJECTED:
2958 /* CURRENT ERROR */
2959 buffer[offset] = 0x70;
2960 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2961 /* ABORTED COMMAND */
2962 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2963 /* READ ERROR */
2964 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2965 /* FAILED RETRANSMISSION REQUEST */
2966 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2967 break;
2968 case TCM_WRITE_PROTECTED:
2969 /* CURRENT ERROR */
2970 buffer[offset] = 0x70;
2971 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2972 /* DATA PROTECT */
2973 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2974 /* WRITE PROTECTED */
2975 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2976 break;
2977 case TCM_ADDRESS_OUT_OF_RANGE:
2978 /* CURRENT ERROR */
2979 buffer[offset] = 0x70;
2980 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2981 /* ILLEGAL REQUEST */
2982 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2983 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2984 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
2985 break;
2986 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2987 /* CURRENT ERROR */
2988 buffer[offset] = 0x70;
2989 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2990 /* UNIT ATTENTION */
2991 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2992 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2993 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2994 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2995 break;
2996 case TCM_CHECK_CONDITION_NOT_READY:
2997 /* CURRENT ERROR */
2998 buffer[offset] = 0x70;
2999 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3000 /* Not Ready */
3001 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3002 transport_get_sense_codes(cmd, &asc, &ascq);
3003 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3004 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3005 break;
3006 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3007 default:
3008 /* CURRENT ERROR */
3009 buffer[offset] = 0x70;
3010 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3011 /* ILLEGAL REQUEST */
3012 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3013 /* LOGICAL UNIT COMMUNICATION FAILURE */
3014 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3015 break;
3016 }
3017 /*
3018 * This code uses linux/include/scsi/scsi.h SAM status codes!
3019 */
3020 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3021 /*
3022 * Automatically padded, this value is encoded in the fabric's
3023 * data_length response PDU containing the SCSI defined sense data.
3024 */
3025 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
3026
3027 after_reason:
3028 return cmd->se_tfo->queue_status(cmd);
3029 }
3030 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3031
3032 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3033 {
3034 int ret = 0;
3035
3036 if (cmd->transport_state & CMD_T_ABORTED) {
3037 if (!send_status ||
3038 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3039 return 1;
3040
3041 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3042 " status for CDB: 0x%02x ITT: 0x%08x\n",
3043 cmd->t_task_cdb[0],
3044 cmd->se_tfo->get_task_tag(cmd));
3045
3046 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3047 cmd->se_tfo->queue_status(cmd);
3048 ret = 1;
3049 }
3050 return ret;
3051 }
3052 EXPORT_SYMBOL(transport_check_aborted_status);
3053
3054 void transport_send_task_abort(struct se_cmd *cmd)
3055 {
3056 unsigned long flags;
3057
3058 spin_lock_irqsave(&cmd->t_state_lock, flags);
3059 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3060 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3061 return;
3062 }
3063 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3064
3065 /*
3066 * If there are still expected incoming fabric WRITEs, we wait
3067 * until until they have completed before sending a TASK_ABORTED
3068 * response. This response with TASK_ABORTED status will be
3069 * queued back to fabric module by transport_check_aborted_status().
3070 */
3071 if (cmd->data_direction == DMA_TO_DEVICE) {
3072 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3073 cmd->transport_state |= CMD_T_ABORTED;
3074 smp_mb__after_atomic_inc();
3075 }
3076 }
3077 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3078
3079 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3080 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3081 cmd->se_tfo->get_task_tag(cmd));
3082
3083 cmd->se_tfo->queue_status(cmd);
3084 }
3085
3086 static void target_tmr_work(struct work_struct *work)
3087 {
3088 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3089 struct se_device *dev = cmd->se_dev;
3090 struct se_tmr_req *tmr = cmd->se_tmr_req;
3091 int ret;
3092
3093 switch (tmr->function) {
3094 case TMR_ABORT_TASK:
3095 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3096 break;
3097 case TMR_ABORT_TASK_SET:
3098 case TMR_CLEAR_ACA:
3099 case TMR_CLEAR_TASK_SET:
3100 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3101 break;
3102 case TMR_LUN_RESET:
3103 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3104 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3105 TMR_FUNCTION_REJECTED;
3106 break;
3107 case TMR_TARGET_WARM_RESET:
3108 tmr->response = TMR_FUNCTION_REJECTED;
3109 break;
3110 case TMR_TARGET_COLD_RESET:
3111 tmr->response = TMR_FUNCTION_REJECTED;
3112 break;
3113 default:
3114 pr_err("Uknown TMR function: 0x%02x.\n",
3115 tmr->function);
3116 tmr->response = TMR_FUNCTION_REJECTED;
3117 break;
3118 }
3119
3120 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3121 cmd->se_tfo->queue_tm_rsp(cmd);
3122
3123 transport_cmd_check_stop_to_fabric(cmd);
3124 }
3125
3126 int transport_generic_handle_tmr(
3127 struct se_cmd *cmd)
3128 {
3129 INIT_WORK(&cmd->work, target_tmr_work);
3130 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3131 return 0;
3132 }
3133 EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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