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ext4: reduce contention on s_orphan_lock
[linux/fpc-iii.git] / drivers / target / target_core_transport.c
blobd4b98690a73680244676b6e608ede6c85ff724cb
1 /*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * (c) Copyright 2002-2013 Datera, Inc.
7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
26 #include <linux/net.h>
27 #include <linux/delay.h>
28 #include <linux/string.h>
29 #include <linux/timer.h>
30 #include <linux/slab.h>
31 #include <linux/spinlock.h>
32 #include <linux/kthread.h>
33 #include <linux/in.h>
34 #include <linux/cdrom.h>
35 #include <linux/module.h>
36 #include <linux/ratelimit.h>
37 #include <asm/unaligned.h>
38 #include <net/sock.h>
39 #include <net/tcp.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_tcq.h>
43
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
47 #include <target/target_core_configfs.h>
48
49 #include "target_core_internal.h"
50 #include "target_core_alua.h"
51 #include "target_core_pr.h"
52 #include "target_core_ua.h"
53
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/target.h>
56
57 static struct workqueue_struct *target_completion_wq;
58 static struct kmem_cache *se_sess_cache;
59 struct kmem_cache *se_ua_cache;
60 struct kmem_cache *t10_pr_reg_cache;
61 struct kmem_cache *t10_alua_lu_gp_cache;
62 struct kmem_cache *t10_alua_lu_gp_mem_cache;
63 struct kmem_cache *t10_alua_tg_pt_gp_cache;
64 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
65 struct kmem_cache *t10_alua_lba_map_cache;
66 struct kmem_cache *t10_alua_lba_map_mem_cache;
67
68 static void transport_complete_task_attr(struct se_cmd *cmd);
69 static void transport_handle_queue_full(struct se_cmd *cmd,
70 struct se_device *dev);
71 static int transport_put_cmd(struct se_cmd *cmd);
72 static void target_complete_ok_work(struct work_struct *work);
73
74 int init_se_kmem_caches(void)
75 {
76 se_sess_cache = kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session), __alignof__(struct se_session),
78 0, NULL);
79 if (!se_sess_cache) {
80 pr_err("kmem_cache_create() for struct se_session"
81 " failed\n");
82 goto out;
83 }
84 se_ua_cache = kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua), __alignof__(struct se_ua),
86 0, NULL);
87 if (!se_ua_cache) {
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
89 goto out_free_sess_cache;
90 }
91 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration),
93 __alignof__(struct t10_pr_registration), 0, NULL);
94 if (!t10_pr_reg_cache) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
96 " failed\n");
97 goto out_free_ua_cache;
98 }
99 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
101 0, NULL);
102 if (!t10_alua_lu_gp_cache) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
104 " failed\n");
105 goto out_free_pr_reg_cache;
106 }
107 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member),
109 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
110 if (!t10_alua_lu_gp_mem_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
112 "cache failed\n");
113 goto out_free_lu_gp_cache;
114 }
115 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp),
117 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
118 if (!t10_alua_tg_pt_gp_cache) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
120 "cache failed\n");
121 goto out_free_lu_gp_mem_cache;
122 }
123 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member),
126 __alignof__(struct t10_alua_tg_pt_gp_member),
127 0, NULL);
128 if (!t10_alua_tg_pt_gp_mem_cache) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
130 "mem_t failed\n");
131 goto out_free_tg_pt_gp_cache;
132 }
133 t10_alua_lba_map_cache = kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map),
136 __alignof__(struct t10_alua_lba_map), 0, NULL);
137 if (!t10_alua_lba_map_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
139 "cache failed\n");
140 goto out_free_tg_pt_gp_mem_cache;
141 }
142 t10_alua_lba_map_mem_cache = kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member),
145 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
146 if (!t10_alua_lba_map_mem_cache) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
148 "cache failed\n");
149 goto out_free_lba_map_cache;
150 }
151
152 target_completion_wq = alloc_workqueue("target_completion",
153 WQ_MEM_RECLAIM, 0);
154 if (!target_completion_wq)
155 goto out_free_lba_map_mem_cache;
156
157 return 0;
158
159 out_free_lba_map_mem_cache:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
161 out_free_lba_map_cache:
162 kmem_cache_destroy(t10_alua_lba_map_cache);
163 out_free_tg_pt_gp_mem_cache:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
165 out_free_tg_pt_gp_cache:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167 out_free_lu_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169 out_free_lu_gp_cache:
170 kmem_cache_destroy(t10_alua_lu_gp_cache);
171 out_free_pr_reg_cache:
172 kmem_cache_destroy(t10_pr_reg_cache);
173 out_free_ua_cache:
174 kmem_cache_destroy(se_ua_cache);
175 out_free_sess_cache:
176 kmem_cache_destroy(se_sess_cache);
177 out:
178 return -ENOMEM;
179 }
180
181 void release_se_kmem_caches(void)
182 {
183 destroy_workqueue(target_completion_wq);
184 kmem_cache_destroy(se_sess_cache);
185 kmem_cache_destroy(se_ua_cache);
186 kmem_cache_destroy(t10_pr_reg_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_cache);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
191 kmem_cache_destroy(t10_alua_lba_map_cache);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
193 }
194
195 /* This code ensures unique mib indexes are handed out. */
196 static DEFINE_SPINLOCK(scsi_mib_index_lock);
197 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
198
199 /*
200 * Allocate a new row index for the entry type specified
201 */
202 u32 scsi_get_new_index(scsi_index_t type)
203 {
204 u32 new_index;
205
206 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
207
208 spin_lock(&scsi_mib_index_lock);
209 new_index = ++scsi_mib_index[type];
210 spin_unlock(&scsi_mib_index_lock);
211
212 return new_index;
213 }
214
215 void transport_subsystem_check_init(void)
216 {
217 int ret;
218 static int sub_api_initialized;
219
220 if (sub_api_initialized)
221 return;
222
223 ret = request_module("target_core_iblock");
224 if (ret != 0)
225 pr_err("Unable to load target_core_iblock\n");
226
227 ret = request_module("target_core_file");
228 if (ret != 0)
229 pr_err("Unable to load target_core_file\n");
230
231 ret = request_module("target_core_pscsi");
232 if (ret != 0)
233 pr_err("Unable to load target_core_pscsi\n");
234
235 sub_api_initialized = 1;
236 }
237
238 struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
239 {
240 struct se_session *se_sess;
241
242 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
243 if (!se_sess) {
244 pr_err("Unable to allocate struct se_session from"
245 " se_sess_cache\n");
246 return ERR_PTR(-ENOMEM);
247 }
248 INIT_LIST_HEAD(&se_sess->sess_list);
249 INIT_LIST_HEAD(&se_sess->sess_acl_list);
250 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
251 INIT_LIST_HEAD(&se_sess->sess_wait_list);
252 spin_lock_init(&se_sess->sess_cmd_lock);
253 kref_init(&se_sess->sess_kref);
254 se_sess->sup_prot_ops = sup_prot_ops;
255
256 return se_sess;
257 }
258 EXPORT_SYMBOL(transport_init_session);
259
260 int transport_alloc_session_tags(struct se_session *se_sess,
261 unsigned int tag_num, unsigned int tag_size)
262 {
263 int rc;
264
265 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
266 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
267 if (!se_sess->sess_cmd_map) {
268 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
269 if (!se_sess->sess_cmd_map) {
270 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
271 return -ENOMEM;
272 }
273 }
274
275 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
276 if (rc < 0) {
277 pr_err("Unable to init se_sess->sess_tag_pool,"
278 " tag_num: %u\n", tag_num);
279 if (is_vmalloc_addr(se_sess->sess_cmd_map))
280 vfree(se_sess->sess_cmd_map);
281 else
282 kfree(se_sess->sess_cmd_map);
283 se_sess->sess_cmd_map = NULL;
284 return -ENOMEM;
285 }
286
287 return 0;
288 }
289 EXPORT_SYMBOL(transport_alloc_session_tags);
290
291 struct se_session *transport_init_session_tags(unsigned int tag_num,
292 unsigned int tag_size,
293 enum target_prot_op sup_prot_ops)
294 {
295 struct se_session *se_sess;
296 int rc;
297
298 se_sess = transport_init_session(sup_prot_ops);
299 if (IS_ERR(se_sess))
300 return se_sess;
301
302 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
303 if (rc < 0) {
304 transport_free_session(se_sess);
305 return ERR_PTR(-ENOMEM);
306 }
307
308 return se_sess;
309 }
310 EXPORT_SYMBOL(transport_init_session_tags);
311
312 /*
313 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
314 */
315 void __transport_register_session(
316 struct se_portal_group *se_tpg,
317 struct se_node_acl *se_nacl,
318 struct se_session *se_sess,
319 void *fabric_sess_ptr)
320 {
321 unsigned char buf[PR_REG_ISID_LEN];
322
323 se_sess->se_tpg = se_tpg;
324 se_sess->fabric_sess_ptr = fabric_sess_ptr;
325 /*
326 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
327 *
328 * Only set for struct se_session's that will actually be moving I/O.
329 * eg: *NOT* discovery sessions.
330 */
331 if (se_nacl) {
332 /*
333 * If the fabric module supports an ISID based TransportID,
334 * save this value in binary from the fabric I_T Nexus now.
335 */
336 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
337 memset(&buf[0], 0, PR_REG_ISID_LEN);
338 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
339 &buf[0], PR_REG_ISID_LEN);
340 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
341 }
342 kref_get(&se_nacl->acl_kref);
343
344 spin_lock_irq(&se_nacl->nacl_sess_lock);
345 /*
346 * The se_nacl->nacl_sess pointer will be set to the
347 * last active I_T Nexus for each struct se_node_acl.
348 */
349 se_nacl->nacl_sess = se_sess;
350
351 list_add_tail(&se_sess->sess_acl_list,
352 &se_nacl->acl_sess_list);
353 spin_unlock_irq(&se_nacl->nacl_sess_lock);
354 }
355 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
356
357 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
358 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
359 }
360 EXPORT_SYMBOL(__transport_register_session);
361
362 void transport_register_session(
363 struct se_portal_group *se_tpg,
364 struct se_node_acl *se_nacl,
365 struct se_session *se_sess,
366 void *fabric_sess_ptr)
367 {
368 unsigned long flags;
369
370 spin_lock_irqsave(&se_tpg->session_lock, flags);
371 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
372 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
373 }
374 EXPORT_SYMBOL(transport_register_session);
375
376 static void target_release_session(struct kref *kref)
377 {
378 struct se_session *se_sess = container_of(kref,
379 struct se_session, sess_kref);
380 struct se_portal_group *se_tpg = se_sess->se_tpg;
381
382 se_tpg->se_tpg_tfo->close_session(se_sess);
383 }
384
385 void target_get_session(struct se_session *se_sess)
386 {
387 kref_get(&se_sess->sess_kref);
388 }
389 EXPORT_SYMBOL(target_get_session);
390
391 void target_put_session(struct se_session *se_sess)
392 {
393 struct se_portal_group *tpg = se_sess->se_tpg;
394
395 if (tpg->se_tpg_tfo->put_session != NULL) {
396 tpg->se_tpg_tfo->put_session(se_sess);
397 return;
398 }
399 kref_put(&se_sess->sess_kref, target_release_session);
400 }
401 EXPORT_SYMBOL(target_put_session);
402
403 static void target_complete_nacl(struct kref *kref)
404 {
405 struct se_node_acl *nacl = container_of(kref,
406 struct se_node_acl, acl_kref);
407
408 complete(&nacl->acl_free_comp);
409 }
410
411 void target_put_nacl(struct se_node_acl *nacl)
412 {
413 kref_put(&nacl->acl_kref, target_complete_nacl);
414 }
415
416 void transport_deregister_session_configfs(struct se_session *se_sess)
417 {
418 struct se_node_acl *se_nacl;
419 unsigned long flags;
420 /*
421 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
422 */
423 se_nacl = se_sess->se_node_acl;
424 if (se_nacl) {
425 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
426 if (se_nacl->acl_stop == 0)
427 list_del(&se_sess->sess_acl_list);
428 /*
429 * If the session list is empty, then clear the pointer.
430 * Otherwise, set the struct se_session pointer from the tail
431 * element of the per struct se_node_acl active session list.
432 */
433 if (list_empty(&se_nacl->acl_sess_list))
434 se_nacl->nacl_sess = NULL;
435 else {
436 se_nacl->nacl_sess = container_of(
437 se_nacl->acl_sess_list.prev,
438 struct se_session, sess_acl_list);
439 }
440 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
441 }
442 }
443 EXPORT_SYMBOL(transport_deregister_session_configfs);
444
445 void transport_free_session(struct se_session *se_sess)
446 {
447 if (se_sess->sess_cmd_map) {
448 percpu_ida_destroy(&se_sess->sess_tag_pool);
449 if (is_vmalloc_addr(se_sess->sess_cmd_map))
450 vfree(se_sess->sess_cmd_map);
451 else
452 kfree(se_sess->sess_cmd_map);
453 }
454 kmem_cache_free(se_sess_cache, se_sess);
455 }
456 EXPORT_SYMBOL(transport_free_session);
457
458 void transport_deregister_session(struct se_session *se_sess)
459 {
460 struct se_portal_group *se_tpg = se_sess->se_tpg;
461 struct target_core_fabric_ops *se_tfo;
462 struct se_node_acl *se_nacl;
463 unsigned long flags;
464 bool comp_nacl = true;
465
466 if (!se_tpg) {
467 transport_free_session(se_sess);
468 return;
469 }
470 se_tfo = se_tpg->se_tpg_tfo;
471
472 spin_lock_irqsave(&se_tpg->session_lock, flags);
473 list_del(&se_sess->sess_list);
474 se_sess->se_tpg = NULL;
475 se_sess->fabric_sess_ptr = NULL;
476 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
477
478 /*
479 * Determine if we need to do extra work for this initiator node's
480 * struct se_node_acl if it had been previously dynamically generated.
481 */
482 se_nacl = se_sess->se_node_acl;
483
484 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
485 if (se_nacl && se_nacl->dynamic_node_acl) {
486 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
487 list_del(&se_nacl->acl_list);
488 se_tpg->num_node_acls--;
489 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
490 core_tpg_wait_for_nacl_pr_ref(se_nacl);
491 core_free_device_list_for_node(se_nacl, se_tpg);
492 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
493
494 comp_nacl = false;
495 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
496 }
497 }
498 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
499
500 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
501 se_tpg->se_tpg_tfo->get_fabric_name());
502 /*
503 * If last kref is dropping now for an explicit NodeACL, awake sleeping
504 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
505 * removal context.
506 */
507 if (se_nacl && comp_nacl == true)
508 target_put_nacl(se_nacl);
509
510 transport_free_session(se_sess);
511 }
512 EXPORT_SYMBOL(transport_deregister_session);
513
514 /*
515 * Called with cmd->t_state_lock held.
516 */
517 static void target_remove_from_state_list(struct se_cmd *cmd)
518 {
519 struct se_device *dev = cmd->se_dev;
520 unsigned long flags;
521
522 if (!dev)
523 return;
524
525 if (cmd->transport_state & CMD_T_BUSY)
526 return;
527
528 spin_lock_irqsave(&dev->execute_task_lock, flags);
529 if (cmd->state_active) {
530 list_del(&cmd->state_list);
531 cmd->state_active = false;
532 }
533 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
534 }
535
536 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
537 bool write_pending)
538 {
539 unsigned long flags;
540
541 spin_lock_irqsave(&cmd->t_state_lock, flags);
542 if (write_pending)
543 cmd->t_state = TRANSPORT_WRITE_PENDING;
544
545 if (remove_from_lists) {
546 target_remove_from_state_list(cmd);
547
548 /*
549 * Clear struct se_cmd->se_lun before the handoff to FE.
550 */
551 cmd->se_lun = NULL;
552 }
553
554 /*
555 * Determine if frontend context caller is requesting the stopping of
556 * this command for frontend exceptions.
557 */
558 if (cmd->transport_state & CMD_T_STOP) {
559 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
560 __func__, __LINE__,
561 cmd->se_tfo->get_task_tag(cmd));
562
563 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
564
565 complete(&cmd->t_transport_stop_comp);
566 return 1;
567 }
568
569 cmd->transport_state &= ~CMD_T_ACTIVE;
570 if (remove_from_lists) {
571 /*
572 * Some fabric modules like tcm_loop can release
573 * their internally allocated I/O reference now and
574 * struct se_cmd now.
575 *
576 * Fabric modules are expected to return '1' here if the
577 * se_cmd being passed is released at this point,
578 * or zero if not being released.
579 */
580 if (cmd->se_tfo->check_stop_free != NULL) {
581 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
582 return cmd->se_tfo->check_stop_free(cmd);
583 }
584 }
585
586 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
587 return 0;
588 }
589
590 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
591 {
592 return transport_cmd_check_stop(cmd, true, false);
593 }
594
595 static void transport_lun_remove_cmd(struct se_cmd *cmd)
596 {
597 struct se_lun *lun = cmd->se_lun;
598
599 if (!lun)
600 return;
601
602 if (cmpxchg(&cmd->lun_ref_active, true, false))
603 percpu_ref_put(&lun->lun_ref);
604 }
605
606 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
607 {
608 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
609 transport_lun_remove_cmd(cmd);
610 /*
611 * Allow the fabric driver to unmap any resources before
612 * releasing the descriptor via TFO->release_cmd()
613 */
614 if (remove)
615 cmd->se_tfo->aborted_task(cmd);
616
617 if (transport_cmd_check_stop_to_fabric(cmd))
618 return;
619 if (remove)
620 transport_put_cmd(cmd);
621 }
622
623 static void target_complete_failure_work(struct work_struct *work)
624 {
625 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
626
627 transport_generic_request_failure(cmd,
628 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
629 }
630
631 /*
632 * Used when asking transport to copy Sense Data from the underlying
633 * Linux/SCSI struct scsi_cmnd
634 */
635 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
636 {
637 struct se_device *dev = cmd->se_dev;
638
639 WARN_ON(!cmd->se_lun);
640
641 if (!dev)
642 return NULL;
643
644 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
645 return NULL;
646
647 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
648
649 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
650 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
651 return cmd->sense_buffer;
652 }
653
654 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
655 {
656 struct se_device *dev = cmd->se_dev;
657 int success = scsi_status == GOOD;
658 unsigned long flags;
659
660 cmd->scsi_status = scsi_status;
661
662
663 spin_lock_irqsave(&cmd->t_state_lock, flags);
664 cmd->transport_state &= ~CMD_T_BUSY;
665
666 if (dev && dev->transport->transport_complete) {
667 dev->transport->transport_complete(cmd,
668 cmd->t_data_sg,
669 transport_get_sense_buffer(cmd));
670 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
671 success = 1;
672 }
673
674 /*
675 * See if we are waiting to complete for an exception condition.
676 */
677 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
678 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
679 complete(&cmd->task_stop_comp);
680 return;
681 }
682
683 /*
684 * Check for case where an explicit ABORT_TASK has been received
685 * and transport_wait_for_tasks() will be waiting for completion..
686 */
687 if (cmd->transport_state & CMD_T_ABORTED &&
688 cmd->transport_state & CMD_T_STOP) {
689 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
690 complete(&cmd->t_transport_stop_comp);
691 return;
692 } else if (!success) {
693 INIT_WORK(&cmd->work, target_complete_failure_work);
694 } else {
695 INIT_WORK(&cmd->work, target_complete_ok_work);
696 }
697
698 cmd->t_state = TRANSPORT_COMPLETE;
699 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
700 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
701
702 queue_work(target_completion_wq, &cmd->work);
703 }
704 EXPORT_SYMBOL(target_complete_cmd);
705
706 static void target_add_to_state_list(struct se_cmd *cmd)
707 {
708 struct se_device *dev = cmd->se_dev;
709 unsigned long flags;
710
711 spin_lock_irqsave(&dev->execute_task_lock, flags);
712 if (!cmd->state_active) {
713 list_add_tail(&cmd->state_list, &dev->state_list);
714 cmd->state_active = true;
715 }
716 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
717 }
718
719 /*
720 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
721 */
722 static void transport_write_pending_qf(struct se_cmd *cmd);
723 static void transport_complete_qf(struct se_cmd *cmd);
724
725 void target_qf_do_work(struct work_struct *work)
726 {
727 struct se_device *dev = container_of(work, struct se_device,
728 qf_work_queue);
729 LIST_HEAD(qf_cmd_list);
730 struct se_cmd *cmd, *cmd_tmp;
731
732 spin_lock_irq(&dev->qf_cmd_lock);
733 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
734 spin_unlock_irq(&dev->qf_cmd_lock);
735
736 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
737 list_del(&cmd->se_qf_node);
738 atomic_dec(&dev->dev_qf_count);
739 smp_mb__after_atomic_dec();
740
741 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
742 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
743 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
744 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
745 : "UNKNOWN");
746
747 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
748 transport_write_pending_qf(cmd);
749 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
750 transport_complete_qf(cmd);
751 }
752 }
753
754 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
755 {
756 switch (cmd->data_direction) {
757 case DMA_NONE:
758 return "NONE";
759 case DMA_FROM_DEVICE:
760 return "READ";
761 case DMA_TO_DEVICE:
762 return "WRITE";
763 case DMA_BIDIRECTIONAL:
764 return "BIDI";
765 default:
766 break;
767 }
768
769 return "UNKNOWN";
770 }
771
772 void transport_dump_dev_state(
773 struct se_device *dev,
774 char *b,
775 int *bl)
776 {
777 *bl += sprintf(b + *bl, "Status: ");
778 if (dev->export_count)
779 *bl += sprintf(b + *bl, "ACTIVATED");
780 else
781 *bl += sprintf(b + *bl, "DEACTIVATED");
782
783 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
784 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
785 dev->dev_attrib.block_size,
786 dev->dev_attrib.hw_max_sectors);
787 *bl += sprintf(b + *bl, " ");
788 }
789
790 void transport_dump_vpd_proto_id(
791 struct t10_vpd *vpd,
792 unsigned char *p_buf,
793 int p_buf_len)
794 {
795 unsigned char buf[VPD_TMP_BUF_SIZE];
796 int len;
797
798 memset(buf, 0, VPD_TMP_BUF_SIZE);
799 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
800
801 switch (vpd->protocol_identifier) {
802 case 0x00:
803 sprintf(buf+len, "Fibre Channel\n");
804 break;
805 case 0x10:
806 sprintf(buf+len, "Parallel SCSI\n");
807 break;
808 case 0x20:
809 sprintf(buf+len, "SSA\n");
810 break;
811 case 0x30:
812 sprintf(buf+len, "IEEE 1394\n");
813 break;
814 case 0x40:
815 sprintf(buf+len, "SCSI Remote Direct Memory Access"
816 " Protocol\n");
817 break;
818 case 0x50:
819 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
820 break;
821 case 0x60:
822 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
823 break;
824 case 0x70:
825 sprintf(buf+len, "Automation/Drive Interface Transport"
826 " Protocol\n");
827 break;
828 case 0x80:
829 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
830 break;
831 default:
832 sprintf(buf+len, "Unknown 0x%02x\n",
833 vpd->protocol_identifier);
834 break;
835 }
836
837 if (p_buf)
838 strncpy(p_buf, buf, p_buf_len);
839 else
840 pr_debug("%s", buf);
841 }
842
843 void
844 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
845 {
846 /*
847 * Check if the Protocol Identifier Valid (PIV) bit is set..
848 *
849 * from spc3r23.pdf section 7.5.1
850 */
851 if (page_83[1] & 0x80) {
852 vpd->protocol_identifier = (page_83[0] & 0xf0);
853 vpd->protocol_identifier_set = 1;
854 transport_dump_vpd_proto_id(vpd, NULL, 0);
855 }
856 }
857 EXPORT_SYMBOL(transport_set_vpd_proto_id);
858
859 int transport_dump_vpd_assoc(
860 struct t10_vpd *vpd,
861 unsigned char *p_buf,
862 int p_buf_len)
863 {
864 unsigned char buf[VPD_TMP_BUF_SIZE];
865 int ret = 0;
866 int len;
867
868 memset(buf, 0, VPD_TMP_BUF_SIZE);
869 len = sprintf(buf, "T10 VPD Identifier Association: ");
870
871 switch (vpd->association) {
872 case 0x00:
873 sprintf(buf+len, "addressed logical unit\n");
874 break;
875 case 0x10:
876 sprintf(buf+len, "target port\n");
877 break;
878 case 0x20:
879 sprintf(buf+len, "SCSI target device\n");
880 break;
881 default:
882 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
883 ret = -EINVAL;
884 break;
885 }
886
887 if (p_buf)
888 strncpy(p_buf, buf, p_buf_len);
889 else
890 pr_debug("%s", buf);
891
892 return ret;
893 }
894
895 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
896 {
897 /*
898 * The VPD identification association..
899 *
900 * from spc3r23.pdf Section 7.6.3.1 Table 297
901 */
902 vpd->association = (page_83[1] & 0x30);
903 return transport_dump_vpd_assoc(vpd, NULL, 0);
904 }
905 EXPORT_SYMBOL(transport_set_vpd_assoc);
906
907 int transport_dump_vpd_ident_type(
908 struct t10_vpd *vpd,
909 unsigned char *p_buf,
910 int p_buf_len)
911 {
912 unsigned char buf[VPD_TMP_BUF_SIZE];
913 int ret = 0;
914 int len;
915
916 memset(buf, 0, VPD_TMP_BUF_SIZE);
917 len = sprintf(buf, "T10 VPD Identifier Type: ");
918
919 switch (vpd->device_identifier_type) {
920 case 0x00:
921 sprintf(buf+len, "Vendor specific\n");
922 break;
923 case 0x01:
924 sprintf(buf+len, "T10 Vendor ID based\n");
925 break;
926 case 0x02:
927 sprintf(buf+len, "EUI-64 based\n");
928 break;
929 case 0x03:
930 sprintf(buf+len, "NAA\n");
931 break;
932 case 0x04:
933 sprintf(buf+len, "Relative target port identifier\n");
934 break;
935 case 0x08:
936 sprintf(buf+len, "SCSI name string\n");
937 break;
938 default:
939 sprintf(buf+len, "Unsupported: 0x%02x\n",
940 vpd->device_identifier_type);
941 ret = -EINVAL;
942 break;
943 }
944
945 if (p_buf) {
946 if (p_buf_len < strlen(buf)+1)
947 return -EINVAL;
948 strncpy(p_buf, buf, p_buf_len);
949 } else {
950 pr_debug("%s", buf);
951 }
952
953 return ret;
954 }
955
956 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
957 {
958 /*
959 * The VPD identifier type..
960 *
961 * from spc3r23.pdf Section 7.6.3.1 Table 298
962 */
963 vpd->device_identifier_type = (page_83[1] & 0x0f);
964 return transport_dump_vpd_ident_type(vpd, NULL, 0);
965 }
966 EXPORT_SYMBOL(transport_set_vpd_ident_type);
967
968 int transport_dump_vpd_ident(
969 struct t10_vpd *vpd,
970 unsigned char *p_buf,
971 int p_buf_len)
972 {
973 unsigned char buf[VPD_TMP_BUF_SIZE];
974 int ret = 0;
975
976 memset(buf, 0, VPD_TMP_BUF_SIZE);
977
978 switch (vpd->device_identifier_code_set) {
979 case 0x01: /* Binary */
980 snprintf(buf, sizeof(buf),
981 "T10 VPD Binary Device Identifier: %s\n",
982 &vpd->device_identifier[0]);
983 break;
984 case 0x02: /* ASCII */
985 snprintf(buf, sizeof(buf),
986 "T10 VPD ASCII Device Identifier: %s\n",
987 &vpd->device_identifier[0]);
988 break;
989 case 0x03: /* UTF-8 */
990 snprintf(buf, sizeof(buf),
991 "T10 VPD UTF-8 Device Identifier: %s\n",
992 &vpd->device_identifier[0]);
993 break;
994 default:
995 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
996 " 0x%02x", vpd->device_identifier_code_set);
997 ret = -EINVAL;
998 break;
999 }
1000
1001 if (p_buf)
1002 strncpy(p_buf, buf, p_buf_len);
1003 else
1004 pr_debug("%s", buf);
1005
1006 return ret;
1007 }
1008
1009 int
1010 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1011 {
1012 static const char hex_str[] = "0123456789abcdef";
1013 int j = 0, i = 4; /* offset to start of the identifier */
1014
1015 /*
1016 * The VPD Code Set (encoding)
1017 *
1018 * from spc3r23.pdf Section 7.6.3.1 Table 296
1019 */
1020 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1021 switch (vpd->device_identifier_code_set) {
1022 case 0x01: /* Binary */
1023 vpd->device_identifier[j++] =
1024 hex_str[vpd->device_identifier_type];
1025 while (i < (4 + page_83[3])) {
1026 vpd->device_identifier[j++] =
1027 hex_str[(page_83[i] & 0xf0) >> 4];
1028 vpd->device_identifier[j++] =
1029 hex_str[page_83[i] & 0x0f];
1030 i++;
1031 }
1032 break;
1033 case 0x02: /* ASCII */
1034 case 0x03: /* UTF-8 */
1035 while (i < (4 + page_83[3]))
1036 vpd->device_identifier[j++] = page_83[i++];
1037 break;
1038 default:
1039 break;
1040 }
1041
1042 return transport_dump_vpd_ident(vpd, NULL, 0);
1043 }
1044 EXPORT_SYMBOL(transport_set_vpd_ident);
1045
1046 sense_reason_t
1047 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1048 {
1049 struct se_device *dev = cmd->se_dev;
1050
1051 if (cmd->unknown_data_length) {
1052 cmd->data_length = size;
1053 } else if (size != cmd->data_length) {
1054 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1055 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1056 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1057 cmd->data_length, size, cmd->t_task_cdb[0]);
1058
1059 if (cmd->data_direction == DMA_TO_DEVICE) {
1060 pr_err("Rejecting underflow/overflow"
1061 " WRITE data\n");
1062 return TCM_INVALID_CDB_FIELD;
1063 }
1064 /*
1065 * Reject READ_* or WRITE_* with overflow/underflow for
1066 * type SCF_SCSI_DATA_CDB.
1067 */
1068 if (dev->dev_attrib.block_size != 512) {
1069 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1070 " CDB on non 512-byte sector setup subsystem"
1071 " plugin: %s\n", dev->transport->name);
1072 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1073 return TCM_INVALID_CDB_FIELD;
1074 }
1075 /*
1076 * For the overflow case keep the existing fabric provided
1077 * ->data_length. Otherwise for the underflow case, reset
1078 * ->data_length to the smaller SCSI expected data transfer
1079 * length.
1080 */
1081 if (size > cmd->data_length) {
1082 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1083 cmd->residual_count = (size - cmd->data_length);
1084 } else {
1085 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1086 cmd->residual_count = (cmd->data_length - size);
1087 cmd->data_length = size;
1088 }
1089 }
1090
1091 return 0;
1092
1093 }
1094
1095 /*
1096 * Used by fabric modules containing a local struct se_cmd within their
1097 * fabric dependent per I/O descriptor.
1098 */
1099 void transport_init_se_cmd(
1100 struct se_cmd *cmd,
1101 struct target_core_fabric_ops *tfo,
1102 struct se_session *se_sess,
1103 u32 data_length,
1104 int data_direction,
1105 int task_attr,
1106 unsigned char *sense_buffer)
1107 {
1108 INIT_LIST_HEAD(&cmd->se_delayed_node);
1109 INIT_LIST_HEAD(&cmd->se_qf_node);
1110 INIT_LIST_HEAD(&cmd->se_cmd_list);
1111 INIT_LIST_HEAD(&cmd->state_list);
1112 init_completion(&cmd->t_transport_stop_comp);
1113 init_completion(&cmd->cmd_wait_comp);
1114 init_completion(&cmd->task_stop_comp);
1115 spin_lock_init(&cmd->t_state_lock);
1116 cmd->transport_state = CMD_T_DEV_ACTIVE;
1117
1118 cmd->se_tfo = tfo;
1119 cmd->se_sess = se_sess;
1120 cmd->data_length = data_length;
1121 cmd->data_direction = data_direction;
1122 cmd->sam_task_attr = task_attr;
1123 cmd->sense_buffer = sense_buffer;
1124
1125 cmd->state_active = false;
1126 }
1127 EXPORT_SYMBOL(transport_init_se_cmd);
1128
1129 static sense_reason_t
1130 transport_check_alloc_task_attr(struct se_cmd *cmd)
1131 {
1132 struct se_device *dev = cmd->se_dev;
1133
1134 /*
1135 * Check if SAM Task Attribute emulation is enabled for this
1136 * struct se_device storage object
1137 */
1138 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1139 return 0;
1140
1141 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1142 pr_debug("SAM Task Attribute ACA"
1143 " emulation is not supported\n");
1144 return TCM_INVALID_CDB_FIELD;
1145 }
1146 /*
1147 * Used to determine when ORDERED commands should go from
1148 * Dormant to Active status.
1149 */
1150 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1151 smp_mb__after_atomic_inc();
1152 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1153 cmd->se_ordered_id, cmd->sam_task_attr,
1154 dev->transport->name);
1155 return 0;
1156 }
1157
1158 sense_reason_t
1159 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1160 {
1161 struct se_device *dev = cmd->se_dev;
1162 sense_reason_t ret;
1163
1164 /*
1165 * Ensure that the received CDB is less than the max (252 + 8) bytes
1166 * for VARIABLE_LENGTH_CMD
1167 */
1168 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1169 pr_err("Received SCSI CDB with command_size: %d that"
1170 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1171 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1172 return TCM_INVALID_CDB_FIELD;
1173 }
1174 /*
1175 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1176 * allocate the additional extended CDB buffer now.. Otherwise
1177 * setup the pointer from __t_task_cdb to t_task_cdb.
1178 */
1179 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1180 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1181 GFP_KERNEL);
1182 if (!cmd->t_task_cdb) {
1183 pr_err("Unable to allocate cmd->t_task_cdb"
1184 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1185 scsi_command_size(cdb),
1186 (unsigned long)sizeof(cmd->__t_task_cdb));
1187 return TCM_OUT_OF_RESOURCES;
1188 }
1189 } else
1190 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1191 /*
1192 * Copy the original CDB into cmd->
1193 */
1194 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1195
1196 trace_target_sequencer_start(cmd);
1197
1198 /*
1199 * Check for an existing UNIT ATTENTION condition
1200 */
1201 ret = target_scsi3_ua_check(cmd);
1202 if (ret)
1203 return ret;
1204
1205 ret = target_alua_state_check(cmd);
1206 if (ret)
1207 return ret;
1208
1209 ret = target_check_reservation(cmd);
1210 if (ret) {
1211 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1212 return ret;
1213 }
1214
1215 ret = dev->transport->parse_cdb(cmd);
1216 if (ret)
1217 return ret;
1218
1219 ret = transport_check_alloc_task_attr(cmd);
1220 if (ret)
1221 return ret;
1222
1223 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1224
1225 spin_lock(&cmd->se_lun->lun_sep_lock);
1226 if (cmd->se_lun->lun_sep)
1227 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1228 spin_unlock(&cmd->se_lun->lun_sep_lock);
1229 return 0;
1230 }
1231 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1232
1233 /*
1234 * Used by fabric module frontends to queue tasks directly.
1235 * Many only be used from process context only
1236 */
1237 int transport_handle_cdb_direct(
1238 struct se_cmd *cmd)
1239 {
1240 sense_reason_t ret;
1241
1242 if (!cmd->se_lun) {
1243 dump_stack();
1244 pr_err("cmd->se_lun is NULL\n");
1245 return -EINVAL;
1246 }
1247 if (in_interrupt()) {
1248 dump_stack();
1249 pr_err("transport_generic_handle_cdb cannot be called"
1250 " from interrupt context\n");
1251 return -EINVAL;
1252 }
1253 /*
1254 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1255 * outstanding descriptors are handled correctly during shutdown via
1256 * transport_wait_for_tasks()
1257 *
1258 * Also, we don't take cmd->t_state_lock here as we only expect
1259 * this to be called for initial descriptor submission.
1260 */
1261 cmd->t_state = TRANSPORT_NEW_CMD;
1262 cmd->transport_state |= CMD_T_ACTIVE;
1263
1264 /*
1265 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1266 * so follow TRANSPORT_NEW_CMD processing thread context usage
1267 * and call transport_generic_request_failure() if necessary..
1268 */
1269 ret = transport_generic_new_cmd(cmd);
1270 if (ret)
1271 transport_generic_request_failure(cmd, ret);
1272 return 0;
1273 }
1274 EXPORT_SYMBOL(transport_handle_cdb_direct);
1275
1276 sense_reason_t
1277 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1278 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1279 {
1280 if (!sgl || !sgl_count)
1281 return 0;
1282
1283 /*
1284 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1285 * scatterlists already have been set to follow what the fabric
1286 * passes for the original expected data transfer length.
1287 */
1288 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1289 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1290 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1291 return TCM_INVALID_CDB_FIELD;
1292 }
1293
1294 cmd->t_data_sg = sgl;
1295 cmd->t_data_nents = sgl_count;
1296
1297 if (sgl_bidi && sgl_bidi_count) {
1298 cmd->t_bidi_data_sg = sgl_bidi;
1299 cmd->t_bidi_data_nents = sgl_bidi_count;
1300 }
1301 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1302 return 0;
1303 }
1304
1305 /*
1306 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1307 * se_cmd + use pre-allocated SGL memory.
1308 *
1309 * @se_cmd: command descriptor to submit
1310 * @se_sess: associated se_sess for endpoint
1311 * @cdb: pointer to SCSI CDB
1312 * @sense: pointer to SCSI sense buffer
1313 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1314 * @data_length: fabric expected data transfer length
1315 * @task_addr: SAM task attribute
1316 * @data_dir: DMA data direction
1317 * @flags: flags for command submission from target_sc_flags_tables
1318 * @sgl: struct scatterlist memory for unidirectional mapping
1319 * @sgl_count: scatterlist count for unidirectional mapping
1320 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1321 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1322 * @sgl_prot: struct scatterlist memory protection information
1323 * @sgl_prot_count: scatterlist count for protection information
1324 *
1325 * Returns non zero to signal active I/O shutdown failure. All other
1326 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1327 * but still return zero here.
1328 *
1329 * This may only be called from process context, and also currently
1330 * assumes internal allocation of fabric payload buffer by target-core.
1331 */
1332 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1333 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1334 u32 data_length, int task_attr, int data_dir, int flags,
1335 struct scatterlist *sgl, u32 sgl_count,
1336 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1337 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1338 {
1339 struct se_portal_group *se_tpg;
1340 sense_reason_t rc;
1341 int ret;
1342
1343 se_tpg = se_sess->se_tpg;
1344 BUG_ON(!se_tpg);
1345 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1346 BUG_ON(in_interrupt());
1347 /*
1348 * Initialize se_cmd for target operation. From this point
1349 * exceptions are handled by sending exception status via
1350 * target_core_fabric_ops->queue_status() callback
1351 */
1352 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1353 data_length, data_dir, task_attr, sense);
1354 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1355 se_cmd->unknown_data_length = 1;
1356 /*
1357 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1358 * se_sess->sess_cmd_list. A second kref_get here is necessary
1359 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1360 * kref_put() to happen during fabric packet acknowledgement.
1361 */
1362 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1363 if (ret)
1364 return ret;
1365 /*
1366 * Signal bidirectional data payloads to target-core
1367 */
1368 if (flags & TARGET_SCF_BIDI_OP)
1369 se_cmd->se_cmd_flags |= SCF_BIDI;
1370 /*
1371 * Locate se_lun pointer and attach it to struct se_cmd
1372 */
1373 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1374 if (rc) {
1375 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1376 target_put_sess_cmd(se_sess, se_cmd);
1377 return 0;
1378 }
1379
1380 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1381 if (rc != 0) {
1382 transport_generic_request_failure(se_cmd, rc);
1383 return 0;
1384 }
1385
1386 /*
1387 * Save pointers for SGLs containing protection information,
1388 * if present.
1389 */
1390 if (sgl_prot_count) {
1391 se_cmd->t_prot_sg = sgl_prot;
1392 se_cmd->t_prot_nents = sgl_prot_count;
1393 }
1394
1395 /*
1396 * When a non zero sgl_count has been passed perform SGL passthrough
1397 * mapping for pre-allocated fabric memory instead of having target
1398 * core perform an internal SGL allocation..
1399 */
1400 if (sgl_count != 0) {
1401 BUG_ON(!sgl);
1402
1403 /*
1404 * A work-around for tcm_loop as some userspace code via
1405 * scsi-generic do not memset their associated read buffers,
1406 * so go ahead and do that here for type non-data CDBs. Also
1407 * note that this is currently guaranteed to be a single SGL
1408 * for this case by target core in target_setup_cmd_from_cdb()
1409 * -> transport_generic_cmd_sequencer().
1410 */
1411 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1412 se_cmd->data_direction == DMA_FROM_DEVICE) {
1413 unsigned char *buf = NULL;
1414
1415 if (sgl)
1416 buf = kmap(sg_page(sgl)) + sgl->offset;
1417
1418 if (buf) {
1419 memset(buf, 0, sgl->length);
1420 kunmap(sg_page(sgl));
1421 }
1422 }
1423
1424 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1425 sgl_bidi, sgl_bidi_count);
1426 if (rc != 0) {
1427 transport_generic_request_failure(se_cmd, rc);
1428 return 0;
1429 }
1430 }
1431
1432 /*
1433 * Check if we need to delay processing because of ALUA
1434 * Active/NonOptimized primary access state..
1435 */
1436 core_alua_check_nonop_delay(se_cmd);
1437
1438 transport_handle_cdb_direct(se_cmd);
1439 return 0;
1440 }
1441 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1442
1443 /*
1444 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1445 *
1446 * @se_cmd: command descriptor to submit
1447 * @se_sess: associated se_sess for endpoint
1448 * @cdb: pointer to SCSI CDB
1449 * @sense: pointer to SCSI sense buffer
1450 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1451 * @data_length: fabric expected data transfer length
1452 * @task_addr: SAM task attribute
1453 * @data_dir: DMA data direction
1454 * @flags: flags for command submission from target_sc_flags_tables
1455 *
1456 * Returns non zero to signal active I/O shutdown failure. All other
1457 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1458 * but still return zero here.
1459 *
1460 * This may only be called from process context, and also currently
1461 * assumes internal allocation of fabric payload buffer by target-core.
1462 *
1463 * It also assumes interal target core SGL memory allocation.
1464 */
1465 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1466 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1467 u32 data_length, int task_attr, int data_dir, int flags)
1468 {
1469 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1470 unpacked_lun, data_length, task_attr, data_dir,
1471 flags, NULL, 0, NULL, 0, NULL, 0);
1472 }
1473 EXPORT_SYMBOL(target_submit_cmd);
1474
1475 static void target_complete_tmr_failure(struct work_struct *work)
1476 {
1477 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1478
1479 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1480 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1481
1482 transport_cmd_check_stop_to_fabric(se_cmd);
1483 }
1484
1485 /**
1486 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1487 * for TMR CDBs
1488 *
1489 * @se_cmd: command descriptor to submit
1490 * @se_sess: associated se_sess for endpoint
1491 * @sense: pointer to SCSI sense buffer
1492 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1493 * @fabric_context: fabric context for TMR req
1494 * @tm_type: Type of TM request
1495 * @gfp: gfp type for caller
1496 * @tag: referenced task tag for TMR_ABORT_TASK
1497 * @flags: submit cmd flags
1498 *
1499 * Callable from all contexts.
1500 **/
1501
1502 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1503 unsigned char *sense, u32 unpacked_lun,
1504 void *fabric_tmr_ptr, unsigned char tm_type,
1505 gfp_t gfp, unsigned int tag, int flags)
1506 {
1507 struct se_portal_group *se_tpg;
1508 int ret;
1509
1510 se_tpg = se_sess->se_tpg;
1511 BUG_ON(!se_tpg);
1512
1513 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1514 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1515 /*
1516 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1517 * allocation failure.
1518 */
1519 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1520 if (ret < 0)
1521 return -ENOMEM;
1522
1523 if (tm_type == TMR_ABORT_TASK)
1524 se_cmd->se_tmr_req->ref_task_tag = tag;
1525
1526 /* See target_submit_cmd for commentary */
1527 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1528 if (ret) {
1529 core_tmr_release_req(se_cmd->se_tmr_req);
1530 return ret;
1531 }
1532
1533 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1534 if (ret) {
1535 /*
1536 * For callback during failure handling, push this work off
1537 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1538 */
1539 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1540 schedule_work(&se_cmd->work);
1541 return 0;
1542 }
1543 transport_generic_handle_tmr(se_cmd);
1544 return 0;
1545 }
1546 EXPORT_SYMBOL(target_submit_tmr);
1547
1548 /*
1549 * If the cmd is active, request it to be stopped and sleep until it
1550 * has completed.
1551 */
1552 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1553 {
1554 bool was_active = false;
1555
1556 if (cmd->transport_state & CMD_T_BUSY) {
1557 cmd->transport_state |= CMD_T_REQUEST_STOP;
1558 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1559
1560 pr_debug("cmd %p waiting to complete\n", cmd);
1561 wait_for_completion(&cmd->task_stop_comp);
1562 pr_debug("cmd %p stopped successfully\n", cmd);
1563
1564 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1565 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1566 cmd->transport_state &= ~CMD_T_BUSY;
1567 was_active = true;
1568 }
1569
1570 return was_active;
1571 }
1572
1573 /*
1574 * Handle SAM-esque emulation for generic transport request failures.
1575 */
1576 void transport_generic_request_failure(struct se_cmd *cmd,
1577 sense_reason_t sense_reason)
1578 {
1579 int ret = 0;
1580
1581 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1582 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1583 cmd->t_task_cdb[0]);
1584 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1585 cmd->se_tfo->get_cmd_state(cmd),
1586 cmd->t_state, sense_reason);
1587 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1588 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1589 (cmd->transport_state & CMD_T_STOP) != 0,
1590 (cmd->transport_state & CMD_T_SENT) != 0);
1591
1592 /*
1593 * For SAM Task Attribute emulation for failed struct se_cmd
1594 */
1595 transport_complete_task_attr(cmd);
1596 /*
1597 * Handle special case for COMPARE_AND_WRITE failure, where the
1598 * callback is expected to drop the per device ->caw_mutex.
1599 */
1600 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1601 cmd->transport_complete_callback)
1602 cmd->transport_complete_callback(cmd);
1603
1604 switch (sense_reason) {
1605 case TCM_NON_EXISTENT_LUN:
1606 case TCM_UNSUPPORTED_SCSI_OPCODE:
1607 case TCM_INVALID_CDB_FIELD:
1608 case TCM_INVALID_PARAMETER_LIST:
1609 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1610 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1611 case TCM_UNKNOWN_MODE_PAGE:
1612 case TCM_WRITE_PROTECTED:
1613 case TCM_ADDRESS_OUT_OF_RANGE:
1614 case TCM_CHECK_CONDITION_ABORT_CMD:
1615 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1616 case TCM_CHECK_CONDITION_NOT_READY:
1617 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1618 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1619 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1620 break;
1621 case TCM_OUT_OF_RESOURCES:
1622 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1623 break;
1624 case TCM_RESERVATION_CONFLICT:
1625 /*
1626 * No SENSE Data payload for this case, set SCSI Status
1627 * and queue the response to $FABRIC_MOD.
1628 *
1629 * Uses linux/include/scsi/scsi.h SAM status codes defs
1630 */
1631 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1632 /*
1633 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1634 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1635 * CONFLICT STATUS.
1636 *
1637 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1638 */
1639 if (cmd->se_sess &&
1640 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1641 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1642 cmd->orig_fe_lun, 0x2C,
1643 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1644
1645 trace_target_cmd_complete(cmd);
1646 ret = cmd->se_tfo-> queue_status(cmd);
1647 if (ret == -EAGAIN || ret == -ENOMEM)
1648 goto queue_full;
1649 goto check_stop;
1650 default:
1651 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1652 cmd->t_task_cdb[0], sense_reason);
1653 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1654 break;
1655 }
1656
1657 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1658 if (ret == -EAGAIN || ret == -ENOMEM)
1659 goto queue_full;
1660
1661 check_stop:
1662 transport_lun_remove_cmd(cmd);
1663 if (!transport_cmd_check_stop_to_fabric(cmd))
1664 ;
1665 return;
1666
1667 queue_full:
1668 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1669 transport_handle_queue_full(cmd, cmd->se_dev);
1670 }
1671 EXPORT_SYMBOL(transport_generic_request_failure);
1672
1673 void __target_execute_cmd(struct se_cmd *cmd)
1674 {
1675 sense_reason_t ret;
1676
1677 if (cmd->execute_cmd) {
1678 ret = cmd->execute_cmd(cmd);
1679 if (ret) {
1680 spin_lock_irq(&cmd->t_state_lock);
1681 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1682 spin_unlock_irq(&cmd->t_state_lock);
1683
1684 transport_generic_request_failure(cmd, ret);
1685 }
1686 }
1687 }
1688
1689 static bool target_handle_task_attr(struct se_cmd *cmd)
1690 {
1691 struct se_device *dev = cmd->se_dev;
1692
1693 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1694 return false;
1695
1696 /*
1697 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1698 * to allow the passed struct se_cmd list of tasks to the front of the list.
1699 */
1700 switch (cmd->sam_task_attr) {
1701 case MSG_HEAD_TAG:
1702 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1703 "se_ordered_id: %u\n",
1704 cmd->t_task_cdb[0], cmd->se_ordered_id);
1705 return false;
1706 case MSG_ORDERED_TAG:
1707 atomic_inc(&dev->dev_ordered_sync);
1708 smp_mb__after_atomic_inc();
1709
1710 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1711 " se_ordered_id: %u\n",
1712 cmd->t_task_cdb[0], cmd->se_ordered_id);
1713
1714 /*
1715 * Execute an ORDERED command if no other older commands
1716 * exist that need to be completed first.
1717 */
1718 if (!atomic_read(&dev->simple_cmds))
1719 return false;
1720 break;
1721 default:
1722 /*
1723 * For SIMPLE and UNTAGGED Task Attribute commands
1724 */
1725 atomic_inc(&dev->simple_cmds);
1726 smp_mb__after_atomic_inc();
1727 break;
1728 }
1729
1730 if (atomic_read(&dev->dev_ordered_sync) == 0)
1731 return false;
1732
1733 spin_lock(&dev->delayed_cmd_lock);
1734 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1735 spin_unlock(&dev->delayed_cmd_lock);
1736
1737 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1738 " delayed CMD list, se_ordered_id: %u\n",
1739 cmd->t_task_cdb[0], cmd->sam_task_attr,
1740 cmd->se_ordered_id);
1741 return true;
1742 }
1743
1744 void target_execute_cmd(struct se_cmd *cmd)
1745 {
1746 /*
1747 * If the received CDB has aleady been aborted stop processing it here.
1748 */
1749 if (transport_check_aborted_status(cmd, 1))
1750 return;
1751
1752 /*
1753 * Determine if frontend context caller is requesting the stopping of
1754 * this command for frontend exceptions.
1755 */
1756 spin_lock_irq(&cmd->t_state_lock);
1757 if (cmd->transport_state & CMD_T_STOP) {
1758 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1759 __func__, __LINE__,
1760 cmd->se_tfo->get_task_tag(cmd));
1761
1762 spin_unlock_irq(&cmd->t_state_lock);
1763 complete(&cmd->t_transport_stop_comp);
1764 return;
1765 }
1766
1767 cmd->t_state = TRANSPORT_PROCESSING;
1768 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1769 spin_unlock_irq(&cmd->t_state_lock);
1770 /*
1771 * Perform WRITE_INSERT of PI using software emulation when backend
1772 * device has PI enabled, if the transport has not already generated
1773 * PI using hardware WRITE_INSERT offload.
1774 */
1775 if (cmd->prot_op == TARGET_PROT_DOUT_INSERT) {
1776 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1777 sbc_dif_generate(cmd);
1778 }
1779
1780 if (target_handle_task_attr(cmd)) {
1781 spin_lock_irq(&cmd->t_state_lock);
1782 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1783 spin_unlock_irq(&cmd->t_state_lock);
1784 return;
1785 }
1786
1787 __target_execute_cmd(cmd);
1788 }
1789 EXPORT_SYMBOL(target_execute_cmd);
1790
1791 /*
1792 * Process all commands up to the last received ORDERED task attribute which
1793 * requires another blocking boundary
1794 */
1795 static void target_restart_delayed_cmds(struct se_device *dev)
1796 {
1797 for (;;) {
1798 struct se_cmd *cmd;
1799
1800 spin_lock(&dev->delayed_cmd_lock);
1801 if (list_empty(&dev->delayed_cmd_list)) {
1802 spin_unlock(&dev->delayed_cmd_lock);
1803 break;
1804 }
1805
1806 cmd = list_entry(dev->delayed_cmd_list.next,
1807 struct se_cmd, se_delayed_node);
1808 list_del(&cmd->se_delayed_node);
1809 spin_unlock(&dev->delayed_cmd_lock);
1810
1811 __target_execute_cmd(cmd);
1812
1813 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1814 break;
1815 }
1816 }
1817
1818 /*
1819 * Called from I/O completion to determine which dormant/delayed
1820 * and ordered cmds need to have their tasks added to the execution queue.
1821 */
1822 static void transport_complete_task_attr(struct se_cmd *cmd)
1823 {
1824 struct se_device *dev = cmd->se_dev;
1825
1826 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1827 return;
1828
1829 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1830 atomic_dec(&dev->simple_cmds);
1831 smp_mb__after_atomic_dec();
1832 dev->dev_cur_ordered_id++;
1833 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1834 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1835 cmd->se_ordered_id);
1836 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1837 dev->dev_cur_ordered_id++;
1838 pr_debug("Incremented dev_cur_ordered_id: %u for"
1839 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1840 cmd->se_ordered_id);
1841 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1842 atomic_dec(&dev->dev_ordered_sync);
1843 smp_mb__after_atomic_dec();
1844
1845 dev->dev_cur_ordered_id++;
1846 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1847 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1848 }
1849
1850 target_restart_delayed_cmds(dev);
1851 }
1852
1853 static void transport_complete_qf(struct se_cmd *cmd)
1854 {
1855 int ret = 0;
1856
1857 transport_complete_task_attr(cmd);
1858
1859 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1860 trace_target_cmd_complete(cmd);
1861 ret = cmd->se_tfo->queue_status(cmd);
1862 if (ret)
1863 goto out;
1864 }
1865
1866 switch (cmd->data_direction) {
1867 case DMA_FROM_DEVICE:
1868 trace_target_cmd_complete(cmd);
1869 ret = cmd->se_tfo->queue_data_in(cmd);
1870 break;
1871 case DMA_TO_DEVICE:
1872 if (cmd->se_cmd_flags & SCF_BIDI) {
1873 ret = cmd->se_tfo->queue_data_in(cmd);
1874 if (ret < 0)
1875 break;
1876 }
1877 /* Fall through for DMA_TO_DEVICE */
1878 case DMA_NONE:
1879 trace_target_cmd_complete(cmd);
1880 ret = cmd->se_tfo->queue_status(cmd);
1881 break;
1882 default:
1883 break;
1884 }
1885
1886 out:
1887 if (ret < 0) {
1888 transport_handle_queue_full(cmd, cmd->se_dev);
1889 return;
1890 }
1891 transport_lun_remove_cmd(cmd);
1892 transport_cmd_check_stop_to_fabric(cmd);
1893 }
1894
1895 static void transport_handle_queue_full(
1896 struct se_cmd *cmd,
1897 struct se_device *dev)
1898 {
1899 spin_lock_irq(&dev->qf_cmd_lock);
1900 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1901 atomic_inc(&dev->dev_qf_count);
1902 smp_mb__after_atomic_inc();
1903 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1904
1905 schedule_work(&cmd->se_dev->qf_work_queue);
1906 }
1907
1908 static bool target_check_read_strip(struct se_cmd *cmd)
1909 {
1910 sense_reason_t rc;
1911
1912 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
1913 rc = sbc_dif_read_strip(cmd);
1914 if (rc) {
1915 cmd->pi_err = rc;
1916 return true;
1917 }
1918 }
1919
1920 return false;
1921 }
1922
1923 static void target_complete_ok_work(struct work_struct *work)
1924 {
1925 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1926 int ret;
1927
1928 /*
1929 * Check if we need to move delayed/dormant tasks from cmds on the
1930 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1931 * Attribute.
1932 */
1933 transport_complete_task_attr(cmd);
1934
1935 /*
1936 * Check to schedule QUEUE_FULL work, or execute an existing
1937 * cmd->transport_qf_callback()
1938 */
1939 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1940 schedule_work(&cmd->se_dev->qf_work_queue);
1941
1942 /*
1943 * Check if we need to send a sense buffer from
1944 * the struct se_cmd in question.
1945 */
1946 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1947 WARN_ON(!cmd->scsi_status);
1948 ret = transport_send_check_condition_and_sense(
1949 cmd, 0, 1);
1950 if (ret == -EAGAIN || ret == -ENOMEM)
1951 goto queue_full;
1952
1953 transport_lun_remove_cmd(cmd);
1954 transport_cmd_check_stop_to_fabric(cmd);
1955 return;
1956 }
1957 /*
1958 * Check for a callback, used by amongst other things
1959 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
1960 */
1961 if (cmd->transport_complete_callback) {
1962 sense_reason_t rc;
1963
1964 rc = cmd->transport_complete_callback(cmd);
1965 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
1966 return;
1967 } else if (rc) {
1968 ret = transport_send_check_condition_and_sense(cmd,
1969 rc, 0);
1970 if (ret == -EAGAIN || ret == -ENOMEM)
1971 goto queue_full;
1972
1973 transport_lun_remove_cmd(cmd);
1974 transport_cmd_check_stop_to_fabric(cmd);
1975 return;
1976 }
1977 }
1978
1979 switch (cmd->data_direction) {
1980 case DMA_FROM_DEVICE:
1981 spin_lock(&cmd->se_lun->lun_sep_lock);
1982 if (cmd->se_lun->lun_sep) {
1983 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1984 cmd->data_length;
1985 }
1986 spin_unlock(&cmd->se_lun->lun_sep_lock);
1987 /*
1988 * Perform READ_STRIP of PI using software emulation when
1989 * backend had PI enabled, if the transport will not be
1990 * performing hardware READ_STRIP offload.
1991 */
1992 if (cmd->prot_op == TARGET_PROT_DIN_STRIP &&
1993 target_check_read_strip(cmd)) {
1994 ret = transport_send_check_condition_and_sense(cmd,
1995 cmd->pi_err, 0);
1996 if (ret == -EAGAIN || ret == -ENOMEM)
1997 goto queue_full;
1998
1999 transport_lun_remove_cmd(cmd);
2000 transport_cmd_check_stop_to_fabric(cmd);
2001 return;
2002 }
2003
2004 trace_target_cmd_complete(cmd);
2005 ret = cmd->se_tfo->queue_data_in(cmd);
2006 if (ret == -EAGAIN || ret == -ENOMEM)
2007 goto queue_full;
2008 break;
2009 case DMA_TO_DEVICE:
2010 spin_lock(&cmd->se_lun->lun_sep_lock);
2011 if (cmd->se_lun->lun_sep) {
2012 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2013 cmd->data_length;
2014 }
2015 spin_unlock(&cmd->se_lun->lun_sep_lock);
2016 /*
2017 * Check if we need to send READ payload for BIDI-COMMAND
2018 */
2019 if (cmd->se_cmd_flags & SCF_BIDI) {
2020 spin_lock(&cmd->se_lun->lun_sep_lock);
2021 if (cmd->se_lun->lun_sep) {
2022 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2023 cmd->data_length;
2024 }
2025 spin_unlock(&cmd->se_lun->lun_sep_lock);
2026 ret = cmd->se_tfo->queue_data_in(cmd);
2027 if (ret == -EAGAIN || ret == -ENOMEM)
2028 goto queue_full;
2029 break;
2030 }
2031 /* Fall through for DMA_TO_DEVICE */
2032 case DMA_NONE:
2033 trace_target_cmd_complete(cmd);
2034 ret = cmd->se_tfo->queue_status(cmd);
2035 if (ret == -EAGAIN || ret == -ENOMEM)
2036 goto queue_full;
2037 break;
2038 default:
2039 break;
2040 }
2041
2042 transport_lun_remove_cmd(cmd);
2043 transport_cmd_check_stop_to_fabric(cmd);
2044 return;
2045
2046 queue_full:
2047 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2048 " data_direction: %d\n", cmd, cmd->data_direction);
2049 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2050 transport_handle_queue_full(cmd, cmd->se_dev);
2051 }
2052
2053 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2054 {
2055 struct scatterlist *sg;
2056 int count;
2057
2058 for_each_sg(sgl, sg, nents, count)
2059 __free_page(sg_page(sg));
2060
2061 kfree(sgl);
2062 }
2063
2064 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2065 {
2066 /*
2067 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2068 * emulation, and free + reset pointers if necessary..
2069 */
2070 if (!cmd->t_data_sg_orig)
2071 return;
2072
2073 kfree(cmd->t_data_sg);
2074 cmd->t_data_sg = cmd->t_data_sg_orig;
2075 cmd->t_data_sg_orig = NULL;
2076 cmd->t_data_nents = cmd->t_data_nents_orig;
2077 cmd->t_data_nents_orig = 0;
2078 }
2079
2080 static inline void transport_free_pages(struct se_cmd *cmd)
2081 {
2082 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2083 transport_reset_sgl_orig(cmd);
2084 return;
2085 }
2086 transport_reset_sgl_orig(cmd);
2087
2088 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2089 cmd->t_data_sg = NULL;
2090 cmd->t_data_nents = 0;
2091
2092 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2093 cmd->t_bidi_data_sg = NULL;
2094 cmd->t_bidi_data_nents = 0;
2095
2096 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2097 cmd->t_prot_sg = NULL;
2098 cmd->t_prot_nents = 0;
2099 }
2100
2101 /**
2102 * transport_release_cmd - free a command
2103 * @cmd: command to free
2104 *
2105 * This routine unconditionally frees a command, and reference counting
2106 * or list removal must be done in the caller.
2107 */
2108 static int transport_release_cmd(struct se_cmd *cmd)
2109 {
2110 BUG_ON(!cmd->se_tfo);
2111
2112 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2113 core_tmr_release_req(cmd->se_tmr_req);
2114 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2115 kfree(cmd->t_task_cdb);
2116 /*
2117 * If this cmd has been setup with target_get_sess_cmd(), drop
2118 * the kref and call ->release_cmd() in kref callback.
2119 */
2120 return target_put_sess_cmd(cmd->se_sess, cmd);
2121 }
2122
2123 /**
2124 * transport_put_cmd - release a reference to a command
2125 * @cmd: command to release
2126 *
2127 * This routine releases our reference to the command and frees it if possible.
2128 */
2129 static int transport_put_cmd(struct se_cmd *cmd)
2130 {
2131 transport_free_pages(cmd);
2132 return transport_release_cmd(cmd);
2133 }
2134
2135 void *transport_kmap_data_sg(struct se_cmd *cmd)
2136 {
2137 struct scatterlist *sg = cmd->t_data_sg;
2138 struct page **pages;
2139 int i;
2140
2141 /*
2142 * We need to take into account a possible offset here for fabrics like
2143 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2144 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2145 */
2146 if (!cmd->t_data_nents)
2147 return NULL;
2148
2149 BUG_ON(!sg);
2150 if (cmd->t_data_nents == 1)
2151 return kmap(sg_page(sg)) + sg->offset;
2152
2153 /* >1 page. use vmap */
2154 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2155 if (!pages)
2156 return NULL;
2157
2158 /* convert sg[] to pages[] */
2159 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2160 pages[i] = sg_page(sg);
2161 }
2162
2163 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2164 kfree(pages);
2165 if (!cmd->t_data_vmap)
2166 return NULL;
2167
2168 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2169 }
2170 EXPORT_SYMBOL(transport_kmap_data_sg);
2171
2172 void transport_kunmap_data_sg(struct se_cmd *cmd)
2173 {
2174 if (!cmd->t_data_nents) {
2175 return;
2176 } else if (cmd->t_data_nents == 1) {
2177 kunmap(sg_page(cmd->t_data_sg));
2178 return;
2179 }
2180
2181 vunmap(cmd->t_data_vmap);
2182 cmd->t_data_vmap = NULL;
2183 }
2184 EXPORT_SYMBOL(transport_kunmap_data_sg);
2185
2186 int
2187 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2188 bool zero_page)
2189 {
2190 struct scatterlist *sg;
2191 struct page *page;
2192 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2193 unsigned int nent;
2194 int i = 0;
2195
2196 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2197 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2198 if (!sg)
2199 return -ENOMEM;
2200
2201 sg_init_table(sg, nent);
2202
2203 while (length) {
2204 u32 page_len = min_t(u32, length, PAGE_SIZE);
2205 page = alloc_page(GFP_KERNEL | zero_flag);
2206 if (!page)
2207 goto out;
2208
2209 sg_set_page(&sg[i], page, page_len, 0);
2210 length -= page_len;
2211 i++;
2212 }
2213 *sgl = sg;
2214 *nents = nent;
2215 return 0;
2216
2217 out:
2218 while (i > 0) {
2219 i--;
2220 __free_page(sg_page(&sg[i]));
2221 }
2222 kfree(sg);
2223 return -ENOMEM;
2224 }
2225
2226 /*
2227 * Allocate any required resources to execute the command. For writes we
2228 * might not have the payload yet, so notify the fabric via a call to
2229 * ->write_pending instead. Otherwise place it on the execution queue.
2230 */
2231 sense_reason_t
2232 transport_generic_new_cmd(struct se_cmd *cmd)
2233 {
2234 int ret = 0;
2235
2236 /*
2237 * Determine is the TCM fabric module has already allocated physical
2238 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2239 * beforehand.
2240 */
2241 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2242 cmd->data_length) {
2243 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2244
2245 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2246 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2247 u32 bidi_length;
2248
2249 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2250 bidi_length = cmd->t_task_nolb *
2251 cmd->se_dev->dev_attrib.block_size;
2252 else
2253 bidi_length = cmd->data_length;
2254
2255 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2256 &cmd->t_bidi_data_nents,
2257 bidi_length, zero_flag);
2258 if (ret < 0)
2259 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2260 }
2261
2262 if (cmd->prot_op != TARGET_PROT_NORMAL) {
2263 ret = target_alloc_sgl(&cmd->t_prot_sg,
2264 &cmd->t_prot_nents,
2265 cmd->prot_length, true);
2266 if (ret < 0)
2267 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2268 }
2269
2270 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2271 cmd->data_length, zero_flag);
2272 if (ret < 0)
2273 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2274 }
2275 /*
2276 * If this command is not a write we can execute it right here,
2277 * for write buffers we need to notify the fabric driver first
2278 * and let it call back once the write buffers are ready.
2279 */
2280 target_add_to_state_list(cmd);
2281 if (cmd->data_direction != DMA_TO_DEVICE) {
2282 target_execute_cmd(cmd);
2283 return 0;
2284 }
2285 transport_cmd_check_stop(cmd, false, true);
2286
2287 ret = cmd->se_tfo->write_pending(cmd);
2288 if (ret == -EAGAIN || ret == -ENOMEM)
2289 goto queue_full;
2290
2291 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2292 WARN_ON(ret);
2293
2294 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2295
2296 queue_full:
2297 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2298 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2299 transport_handle_queue_full(cmd, cmd->se_dev);
2300 return 0;
2301 }
2302 EXPORT_SYMBOL(transport_generic_new_cmd);
2303
2304 static void transport_write_pending_qf(struct se_cmd *cmd)
2305 {
2306 int ret;
2307
2308 ret = cmd->se_tfo->write_pending(cmd);
2309 if (ret == -EAGAIN || ret == -ENOMEM) {
2310 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2311 cmd);
2312 transport_handle_queue_full(cmd, cmd->se_dev);
2313 }
2314 }
2315
2316 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2317 {
2318 unsigned long flags;
2319 int ret = 0;
2320
2321 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2322 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2323 transport_wait_for_tasks(cmd);
2324
2325 ret = transport_release_cmd(cmd);
2326 } else {
2327 if (wait_for_tasks)
2328 transport_wait_for_tasks(cmd);
2329 /*
2330 * Handle WRITE failure case where transport_generic_new_cmd()
2331 * has already added se_cmd to state_list, but fabric has
2332 * failed command before I/O submission.
2333 */
2334 if (cmd->state_active) {
2335 spin_lock_irqsave(&cmd->t_state_lock, flags);
2336 target_remove_from_state_list(cmd);
2337 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2338 }
2339
2340 if (cmd->se_lun)
2341 transport_lun_remove_cmd(cmd);
2342
2343 ret = transport_put_cmd(cmd);
2344 }
2345 return ret;
2346 }
2347 EXPORT_SYMBOL(transport_generic_free_cmd);
2348
2349 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2350 * @se_sess: session to reference
2351 * @se_cmd: command descriptor to add
2352 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2353 */
2354 int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2355 bool ack_kref)
2356 {
2357 unsigned long flags;
2358 int ret = 0;
2359
2360 kref_init(&se_cmd->cmd_kref);
2361 /*
2362 * Add a second kref if the fabric caller is expecting to handle
2363 * fabric acknowledgement that requires two target_put_sess_cmd()
2364 * invocations before se_cmd descriptor release.
2365 */
2366 if (ack_kref == true) {
2367 kref_get(&se_cmd->cmd_kref);
2368 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2369 }
2370
2371 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2372 if (se_sess->sess_tearing_down) {
2373 ret = -ESHUTDOWN;
2374 goto out;
2375 }
2376 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2377 out:
2378 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2379 return ret;
2380 }
2381 EXPORT_SYMBOL(target_get_sess_cmd);
2382
2383 static void target_release_cmd_kref(struct kref *kref)
2384 {
2385 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2386 struct se_session *se_sess = se_cmd->se_sess;
2387
2388 if (list_empty(&se_cmd->se_cmd_list)) {
2389 spin_unlock(&se_sess->sess_cmd_lock);
2390 se_cmd->se_tfo->release_cmd(se_cmd);
2391 return;
2392 }
2393 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2394 spin_unlock(&se_sess->sess_cmd_lock);
2395 complete(&se_cmd->cmd_wait_comp);
2396 return;
2397 }
2398 list_del(&se_cmd->se_cmd_list);
2399 spin_unlock(&se_sess->sess_cmd_lock);
2400
2401 se_cmd->se_tfo->release_cmd(se_cmd);
2402 }
2403
2404 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2405 * @se_sess: session to reference
2406 * @se_cmd: command descriptor to drop
2407 */
2408 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2409 {
2410 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2411 &se_sess->sess_cmd_lock);
2412 }
2413 EXPORT_SYMBOL(target_put_sess_cmd);
2414
2415 /* target_sess_cmd_list_set_waiting - Flag all commands in
2416 * sess_cmd_list to complete cmd_wait_comp. Set
2417 * sess_tearing_down so no more commands are queued.
2418 * @se_sess: session to flag
2419 */
2420 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2421 {
2422 struct se_cmd *se_cmd;
2423 unsigned long flags;
2424
2425 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2426 if (se_sess->sess_tearing_down) {
2427 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2428 return;
2429 }
2430 se_sess->sess_tearing_down = 1;
2431 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2432
2433 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2434 se_cmd->cmd_wait_set = 1;
2435
2436 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2437 }
2438 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2439
2440 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2441 * @se_sess: session to wait for active I/O
2442 */
2443 void target_wait_for_sess_cmds(struct se_session *se_sess)
2444 {
2445 struct se_cmd *se_cmd, *tmp_cmd;
2446 unsigned long flags;
2447
2448 list_for_each_entry_safe(se_cmd, tmp_cmd,
2449 &se_sess->sess_wait_list, se_cmd_list) {
2450 list_del(&se_cmd->se_cmd_list);
2451
2452 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2453 " %d\n", se_cmd, se_cmd->t_state,
2454 se_cmd->se_tfo->get_cmd_state(se_cmd));
2455
2456 wait_for_completion(&se_cmd->cmd_wait_comp);
2457 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2458 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2459 se_cmd->se_tfo->get_cmd_state(se_cmd));
2460
2461 se_cmd->se_tfo->release_cmd(se_cmd);
2462 }
2463
2464 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2465 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2466 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2467
2468 }
2469 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2470
2471 static int transport_clear_lun_ref_thread(void *p)
2472 {
2473 struct se_lun *lun = p;
2474
2475 percpu_ref_kill(&lun->lun_ref);
2476
2477 wait_for_completion(&lun->lun_ref_comp);
2478 complete(&lun->lun_shutdown_comp);
2479
2480 return 0;
2481 }
2482
2483 int transport_clear_lun_ref(struct se_lun *lun)
2484 {
2485 struct task_struct *kt;
2486
2487 kt = kthread_run(transport_clear_lun_ref_thread, lun,
2488 "tcm_cl_%u", lun->unpacked_lun);
2489 if (IS_ERR(kt)) {
2490 pr_err("Unable to start clear_lun thread\n");
2491 return PTR_ERR(kt);
2492 }
2493 wait_for_completion(&lun->lun_shutdown_comp);
2494
2495 return 0;
2496 }
2497
2498 /**
2499 * transport_wait_for_tasks - wait for completion to occur
2500 * @cmd: command to wait
2501 *
2502 * Called from frontend fabric context to wait for storage engine
2503 * to pause and/or release frontend generated struct se_cmd.
2504 */
2505 bool transport_wait_for_tasks(struct se_cmd *cmd)
2506 {
2507 unsigned long flags;
2508
2509 spin_lock_irqsave(&cmd->t_state_lock, flags);
2510 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2511 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2513 return false;
2514 }
2515
2516 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2517 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2518 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2519 return false;
2520 }
2521
2522 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2523 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2524 return false;
2525 }
2526
2527 cmd->transport_state |= CMD_T_STOP;
2528
2529 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2530 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2531 cmd, cmd->se_tfo->get_task_tag(cmd),
2532 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2533
2534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2535
2536 wait_for_completion(&cmd->t_transport_stop_comp);
2537
2538 spin_lock_irqsave(&cmd->t_state_lock, flags);
2539 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2540
2541 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2542 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2543 cmd->se_tfo->get_task_tag(cmd));
2544
2545 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2546
2547 return true;
2548 }
2549 EXPORT_SYMBOL(transport_wait_for_tasks);
2550
2551 static int transport_get_sense_codes(
2552 struct se_cmd *cmd,
2553 u8 *asc,
2554 u8 *ascq)
2555 {
2556 *asc = cmd->scsi_asc;
2557 *ascq = cmd->scsi_ascq;
2558
2559 return 0;
2560 }
2561
2562 static
2563 void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2564 {
2565 /* Place failed LBA in sense data information descriptor 0. */
2566 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2567 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2568 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2569 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2570
2571 /* Descriptor Information: failing sector */
2572 put_unaligned_be64(bad_sector, &buffer[12]);
2573 }
2574
2575 int
2576 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2577 sense_reason_t reason, int from_transport)
2578 {
2579 unsigned char *buffer = cmd->sense_buffer;
2580 unsigned long flags;
2581 u8 asc = 0, ascq = 0;
2582
2583 spin_lock_irqsave(&cmd->t_state_lock, flags);
2584 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2586 return 0;
2587 }
2588 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2590
2591 if (!reason && from_transport)
2592 goto after_reason;
2593
2594 if (!from_transport)
2595 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2596
2597 /*
2598 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2599 * SENSE KEY values from include/scsi/scsi.h
2600 */
2601 switch (reason) {
2602 case TCM_NO_SENSE:
2603 /* CURRENT ERROR */
2604 buffer[0] = 0x70;
2605 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2606 /* Not Ready */
2607 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2608 /* NO ADDITIONAL SENSE INFORMATION */
2609 buffer[SPC_ASC_KEY_OFFSET] = 0;
2610 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2611 break;
2612 case TCM_NON_EXISTENT_LUN:
2613 /* CURRENT ERROR */
2614 buffer[0] = 0x70;
2615 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2616 /* ILLEGAL REQUEST */
2617 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2618 /* LOGICAL UNIT NOT SUPPORTED */
2619 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2620 break;
2621 case TCM_UNSUPPORTED_SCSI_OPCODE:
2622 case TCM_SECTOR_COUNT_TOO_MANY:
2623 /* CURRENT ERROR */
2624 buffer[0] = 0x70;
2625 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2626 /* ILLEGAL REQUEST */
2627 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2628 /* INVALID COMMAND OPERATION CODE */
2629 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2630 break;
2631 case TCM_UNKNOWN_MODE_PAGE:
2632 /* CURRENT ERROR */
2633 buffer[0] = 0x70;
2634 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2635 /* ILLEGAL REQUEST */
2636 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2637 /* INVALID FIELD IN CDB */
2638 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2639 break;
2640 case TCM_CHECK_CONDITION_ABORT_CMD:
2641 /* CURRENT ERROR */
2642 buffer[0] = 0x70;
2643 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2644 /* ABORTED COMMAND */
2645 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2646 /* BUS DEVICE RESET FUNCTION OCCURRED */
2647 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2648 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2649 break;
2650 case TCM_INCORRECT_AMOUNT_OF_DATA:
2651 /* CURRENT ERROR */
2652 buffer[0] = 0x70;
2653 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2654 /* ABORTED COMMAND */
2655 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2656 /* WRITE ERROR */
2657 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2658 /* NOT ENOUGH UNSOLICITED DATA */
2659 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2660 break;
2661 case TCM_INVALID_CDB_FIELD:
2662 /* CURRENT ERROR */
2663 buffer[0] = 0x70;
2664 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2665 /* ILLEGAL REQUEST */
2666 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2667 /* INVALID FIELD IN CDB */
2668 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2669 break;
2670 case TCM_INVALID_PARAMETER_LIST:
2671 /* CURRENT ERROR */
2672 buffer[0] = 0x70;
2673 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2674 /* ILLEGAL REQUEST */
2675 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2676 /* INVALID FIELD IN PARAMETER LIST */
2677 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2678 break;
2679 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2680 /* CURRENT ERROR */
2681 buffer[0] = 0x70;
2682 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2683 /* ILLEGAL REQUEST */
2684 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2685 /* PARAMETER LIST LENGTH ERROR */
2686 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2687 break;
2688 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2689 /* CURRENT ERROR */
2690 buffer[0] = 0x70;
2691 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2692 /* ABORTED COMMAND */
2693 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2694 /* WRITE ERROR */
2695 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2696 /* UNEXPECTED_UNSOLICITED_DATA */
2697 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2698 break;
2699 case TCM_SERVICE_CRC_ERROR:
2700 /* CURRENT ERROR */
2701 buffer[0] = 0x70;
2702 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2703 /* ABORTED COMMAND */
2704 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2705 /* PROTOCOL SERVICE CRC ERROR */
2706 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2707 /* N/A */
2708 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2709 break;
2710 case TCM_SNACK_REJECTED:
2711 /* CURRENT ERROR */
2712 buffer[0] = 0x70;
2713 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2714 /* ABORTED COMMAND */
2715 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2716 /* READ ERROR */
2717 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2718 /* FAILED RETRANSMISSION REQUEST */
2719 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2720 break;
2721 case TCM_WRITE_PROTECTED:
2722 /* CURRENT ERROR */
2723 buffer[0] = 0x70;
2724 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2725 /* DATA PROTECT */
2726 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2727 /* WRITE PROTECTED */
2728 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2729 break;
2730 case TCM_ADDRESS_OUT_OF_RANGE:
2731 /* CURRENT ERROR */
2732 buffer[0] = 0x70;
2733 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2734 /* ILLEGAL REQUEST */
2735 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2736 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2737 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2738 break;
2739 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2740 /* CURRENT ERROR */
2741 buffer[0] = 0x70;
2742 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2743 /* UNIT ATTENTION */
2744 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2745 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2746 buffer[SPC_ASC_KEY_OFFSET] = asc;
2747 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2748 break;
2749 case TCM_CHECK_CONDITION_NOT_READY:
2750 /* CURRENT ERROR */
2751 buffer[0] = 0x70;
2752 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2753 /* Not Ready */
2754 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2755 transport_get_sense_codes(cmd, &asc, &ascq);
2756 buffer[SPC_ASC_KEY_OFFSET] = asc;
2757 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2758 break;
2759 case TCM_MISCOMPARE_VERIFY:
2760 /* CURRENT ERROR */
2761 buffer[0] = 0x70;
2762 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2763 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2764 /* MISCOMPARE DURING VERIFY OPERATION */
2765 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2766 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2767 break;
2768 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2769 /* CURRENT ERROR */
2770 buffer[0] = 0x70;
2771 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2772 /* ILLEGAL REQUEST */
2773 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2774 /* LOGICAL BLOCK GUARD CHECK FAILED */
2775 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2776 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
2777 transport_err_sector_info(buffer, cmd->bad_sector);
2778 break;
2779 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2780 /* CURRENT ERROR */
2781 buffer[0] = 0x70;
2782 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2783 /* ILLEGAL REQUEST */
2784 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2785 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2786 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2787 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
2788 transport_err_sector_info(buffer, cmd->bad_sector);
2789 break;
2790 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2791 /* CURRENT ERROR */
2792 buffer[0] = 0x70;
2793 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2794 /* ILLEGAL REQUEST */
2795 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2796 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2797 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2798 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2799 transport_err_sector_info(buffer, cmd->bad_sector);
2800 break;
2801 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2802 default:
2803 /* CURRENT ERROR */
2804 buffer[0] = 0x70;
2805 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2806 /*
2807 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2808 * Solaris initiators. Returning NOT READY instead means the
2809 * operations will be retried a finite number of times and we
2810 * can survive intermittent errors.
2811 */
2812 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2813 /* LOGICAL UNIT COMMUNICATION FAILURE */
2814 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2815 break;
2816 }
2817 /*
2818 * This code uses linux/include/scsi/scsi.h SAM status codes!
2819 */
2820 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2821 /*
2822 * Automatically padded, this value is encoded in the fabric's
2823 * data_length response PDU containing the SCSI defined sense data.
2824 */
2825 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2826
2827 after_reason:
2828 trace_target_cmd_complete(cmd);
2829 return cmd->se_tfo->queue_status(cmd);
2830 }
2831 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2832
2833 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2834 {
2835 if (!(cmd->transport_state & CMD_T_ABORTED))
2836 return 0;
2837
2838 /*
2839 * If cmd has been aborted but either no status is to be sent or it has
2840 * already been sent, just return
2841 */
2842 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
2843 return 1;
2844
2845 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2846 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
2847
2848 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
2849 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2850 trace_target_cmd_complete(cmd);
2851 cmd->se_tfo->queue_status(cmd);
2852
2853 return 1;
2854 }
2855 EXPORT_SYMBOL(transport_check_aborted_status);
2856
2857 void transport_send_task_abort(struct se_cmd *cmd)
2858 {
2859 unsigned long flags;
2860
2861 spin_lock_irqsave(&cmd->t_state_lock, flags);
2862 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
2863 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2864 return;
2865 }
2866 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2867
2868 /*
2869 * If there are still expected incoming fabric WRITEs, we wait
2870 * until until they have completed before sending a TASK_ABORTED
2871 * response. This response with TASK_ABORTED status will be
2872 * queued back to fabric module by transport_check_aborted_status().
2873 */
2874 if (cmd->data_direction == DMA_TO_DEVICE) {
2875 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2876 cmd->transport_state |= CMD_T_ABORTED;
2877 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
2878 smp_mb__after_atomic_inc();
2879 return;
2880 }
2881 }
2882 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2883
2884 transport_lun_remove_cmd(cmd);
2885
2886 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2887 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
2888 cmd->se_tfo->get_task_tag(cmd));
2889
2890 trace_target_cmd_complete(cmd);
2891 cmd->se_tfo->queue_status(cmd);
2892 }
2893
2894 static void target_tmr_work(struct work_struct *work)
2895 {
2896 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2897 struct se_device *dev = cmd->se_dev;
2898 struct se_tmr_req *tmr = cmd->se_tmr_req;
2899 int ret;
2900
2901 switch (tmr->function) {
2902 case TMR_ABORT_TASK:
2903 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2904 break;
2905 case TMR_ABORT_TASK_SET:
2906 case TMR_CLEAR_ACA:
2907 case TMR_CLEAR_TASK_SET:
2908 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2909 break;
2910 case TMR_LUN_RESET:
2911 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2912 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2913 TMR_FUNCTION_REJECTED;
2914 break;
2915 case TMR_TARGET_WARM_RESET:
2916 tmr->response = TMR_FUNCTION_REJECTED;
2917 break;
2918 case TMR_TARGET_COLD_RESET:
2919 tmr->response = TMR_FUNCTION_REJECTED;
2920 break;
2921 default:
2922 pr_err("Uknown TMR function: 0x%02x.\n",
2923 tmr->function);
2924 tmr->response = TMR_FUNCTION_REJECTED;
2925 break;
2926 }
2927
2928 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
2929 cmd->se_tfo->queue_tm_rsp(cmd);
2930
2931 transport_cmd_check_stop_to_fabric(cmd);
2932 }
2933
2934 int transport_generic_handle_tmr(
2935 struct se_cmd *cmd)
2936 {
2937 INIT_WORK(&cmd->work, target_tmr_work);
2938 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
2939 return 0;
2940 }
2941 EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux with added FPC-III support