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13#include <linux/net.h>
14#include <linux/delay.h>
15#include <linux/string.h>
16#include <linux/timer.h>
17#include <linux/slab.h>
18#include <linux/spinlock.h>
19#include <linux/kthread.h>
20#include <linux/in.h>
21#include <linux/cdrom.h>
22#include <linux/module.h>
23#include <linux/ratelimit.h>
24#include <linux/vmalloc.h>
25#include <asm/unaligned.h>
26#include <net/sock.h>
27#include <net/tcp.h>
28#include <scsi/scsi_proto.h>
29#include <scsi/scsi_common.h>
30
31#include <target/target_core_base.h>
32#include <target/target_core_backend.h>
33#include <target/target_core_fabric.h>
34
35#include "target_core_internal.h"
36#include "target_core_alua.h"
37#include "target_core_pr.h"
38#include "target_core_ua.h"
39
40#define CREATE_TRACE_POINTS
41#include <trace/events/target.h>
42
43static struct workqueue_struct *target_completion_wq;
44static struct workqueue_struct *target_submission_wq;
45static struct kmem_cache *se_sess_cache;
46struct kmem_cache *se_ua_cache;
47struct kmem_cache *t10_pr_reg_cache;
48struct kmem_cache *t10_alua_lu_gp_cache;
49struct kmem_cache *t10_alua_lu_gp_mem_cache;
50struct kmem_cache *t10_alua_tg_pt_gp_cache;
51struct kmem_cache *t10_alua_lba_map_cache;
52struct kmem_cache *t10_alua_lba_map_mem_cache;
53
54static void transport_complete_task_attr(struct se_cmd *cmd);
55static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason);
56static void transport_handle_queue_full(struct se_cmd *cmd,
57 struct se_device *dev, int err, bool write_pending);
58static void target_complete_ok_work(struct work_struct *work);
59
60int init_se_kmem_caches(void)
61{
62 se_sess_cache = kmem_cache_create("se_sess_cache",
63 sizeof(struct se_session), __alignof__(struct se_session),
64 0, NULL);
65 if (!se_sess_cache) {
66 pr_err("kmem_cache_create() for struct se_session"
67 " failed\n");
68 goto out;
69 }
70 se_ua_cache = kmem_cache_create("se_ua_cache",
71 sizeof(struct se_ua), __alignof__(struct se_ua),
72 0, NULL);
73 if (!se_ua_cache) {
74 pr_err("kmem_cache_create() for struct se_ua failed\n");
75 goto out_free_sess_cache;
76 }
77 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
78 sizeof(struct t10_pr_registration),
79 __alignof__(struct t10_pr_registration), 0, NULL);
80 if (!t10_pr_reg_cache) {
81 pr_err("kmem_cache_create() for struct t10_pr_registration"
82 " failed\n");
83 goto out_free_ua_cache;
84 }
85 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
86 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
87 0, NULL);
88 if (!t10_alua_lu_gp_cache) {
89 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
90 " failed\n");
91 goto out_free_pr_reg_cache;
92 }
93 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
94 sizeof(struct t10_alua_lu_gp_member),
95 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
96 if (!t10_alua_lu_gp_mem_cache) {
97 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
98 "cache failed\n");
99 goto out_free_lu_gp_cache;
100 }
101 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
102 sizeof(struct t10_alua_tg_pt_gp),
103 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
104 if (!t10_alua_tg_pt_gp_cache) {
105 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
106 "cache failed\n");
107 goto out_free_lu_gp_mem_cache;
108 }
109 t10_alua_lba_map_cache = kmem_cache_create(
110 "t10_alua_lba_map_cache",
111 sizeof(struct t10_alua_lba_map),
112 __alignof__(struct t10_alua_lba_map), 0, NULL);
113 if (!t10_alua_lba_map_cache) {
114 pr_err("kmem_cache_create() for t10_alua_lba_map_"
115 "cache failed\n");
116 goto out_free_tg_pt_gp_cache;
117 }
118 t10_alua_lba_map_mem_cache = kmem_cache_create(
119 "t10_alua_lba_map_mem_cache",
120 sizeof(struct t10_alua_lba_map_member),
121 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
122 if (!t10_alua_lba_map_mem_cache) {
123 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
124 "cache failed\n");
125 goto out_free_lba_map_cache;
126 }
127
128 target_completion_wq = alloc_workqueue("target_completion",
129 WQ_MEM_RECLAIM, 0);
130 if (!target_completion_wq)
131 goto out_free_lba_map_mem_cache;
132
133 target_submission_wq = alloc_workqueue("target_submission",
134 WQ_MEM_RECLAIM, 0);
135 if (!target_submission_wq)
136 goto out_free_completion_wq;
137
138 return 0;
139
140out_free_completion_wq:
141 destroy_workqueue(target_completion_wq);
142out_free_lba_map_mem_cache:
143 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
144out_free_lba_map_cache:
145 kmem_cache_destroy(t10_alua_lba_map_cache);
146out_free_tg_pt_gp_cache:
147 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
148out_free_lu_gp_mem_cache:
149 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
150out_free_lu_gp_cache:
151 kmem_cache_destroy(t10_alua_lu_gp_cache);
152out_free_pr_reg_cache:
153 kmem_cache_destroy(t10_pr_reg_cache);
154out_free_ua_cache:
155 kmem_cache_destroy(se_ua_cache);
156out_free_sess_cache:
157 kmem_cache_destroy(se_sess_cache);
158out:
159 return -ENOMEM;
160}
161
162void release_se_kmem_caches(void)
163{
164 destroy_workqueue(target_submission_wq);
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_lba_map_cache);
173 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
174}
175
176
177static DEFINE_SPINLOCK(scsi_mib_index_lock);
178static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
179
180
181
182
183u32 scsi_get_new_index(scsi_index_t type)
184{
185 u32 new_index;
186
187 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
188
189 spin_lock(&scsi_mib_index_lock);
190 new_index = ++scsi_mib_index[type];
191 spin_unlock(&scsi_mib_index_lock);
192
193 return new_index;
194}
195
196void transport_subsystem_check_init(void)
197{
198 int ret;
199 static int sub_api_initialized;
200
201 if (sub_api_initialized)
202 return;
203
204 ret = IS_ENABLED(CONFIG_TCM_IBLOCK) && request_module("target_core_iblock");
205 if (ret != 0)
206 pr_err("Unable to load target_core_iblock\n");
207
208 ret = IS_ENABLED(CONFIG_TCM_FILEIO) && request_module("target_core_file");
209 if (ret != 0)
210 pr_err("Unable to load target_core_file\n");
211
212 ret = IS_ENABLED(CONFIG_TCM_PSCSI) && request_module("target_core_pscsi");
213 if (ret != 0)
214 pr_err("Unable to load target_core_pscsi\n");
215
216 ret = IS_ENABLED(CONFIG_TCM_USER2) && request_module("target_core_user");
217 if (ret != 0)
218 pr_err("Unable to load target_core_user\n");
219
220 sub_api_initialized = 1;
221}
222
223static void target_release_sess_cmd_refcnt(struct percpu_ref *ref)
224{
225 struct se_session *sess = container_of(ref, typeof(*sess), cmd_count);
226
227 wake_up(&sess->cmd_count_wq);
228}
229
230
231
232
233
234
235
236int transport_init_session(struct se_session *se_sess)
237{
238 INIT_LIST_HEAD(&se_sess->sess_list);
239 INIT_LIST_HEAD(&se_sess->sess_acl_list);
240 spin_lock_init(&se_sess->sess_cmd_lock);
241 init_waitqueue_head(&se_sess->cmd_count_wq);
242 init_completion(&se_sess->stop_done);
243 atomic_set(&se_sess->stopped, 0);
244 return percpu_ref_init(&se_sess->cmd_count,
245 target_release_sess_cmd_refcnt, 0, GFP_KERNEL);
246}
247EXPORT_SYMBOL(transport_init_session);
248
249void transport_uninit_session(struct se_session *se_sess)
250{
251
252
253
254
255
256 if (!atomic_read(&se_sess->stopped))
257 percpu_ref_put(&se_sess->cmd_count);
258
259 percpu_ref_exit(&se_sess->cmd_count);
260}
261
262
263
264
265
266struct se_session *transport_alloc_session(enum target_prot_op sup_prot_ops)
267{
268 struct se_session *se_sess;
269 int ret;
270
271 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
272 if (!se_sess) {
273 pr_err("Unable to allocate struct se_session from"
274 " se_sess_cache\n");
275 return ERR_PTR(-ENOMEM);
276 }
277 ret = transport_init_session(se_sess);
278 if (ret < 0) {
279 kmem_cache_free(se_sess_cache, se_sess);
280 return ERR_PTR(ret);
281 }
282 se_sess->sup_prot_ops = sup_prot_ops;
283
284 return se_sess;
285}
286EXPORT_SYMBOL(transport_alloc_session);
287
288
289
290
291
292
293
294
295int transport_alloc_session_tags(struct se_session *se_sess,
296 unsigned int tag_num, unsigned int tag_size)
297{
298 int rc;
299
300 se_sess->sess_cmd_map = kvcalloc(tag_size, tag_num,
301 GFP_KERNEL | __GFP_RETRY_MAYFAIL);
302 if (!se_sess->sess_cmd_map) {
303 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
304 return -ENOMEM;
305 }
306
307 rc = sbitmap_queue_init_node(&se_sess->sess_tag_pool, tag_num, -1,
308 false, GFP_KERNEL, NUMA_NO_NODE);
309 if (rc < 0) {
310 pr_err("Unable to init se_sess->sess_tag_pool,"
311 " tag_num: %u\n", tag_num);
312 kvfree(se_sess->sess_cmd_map);
313 se_sess->sess_cmd_map = NULL;
314 return -ENOMEM;
315 }
316
317 return 0;
318}
319EXPORT_SYMBOL(transport_alloc_session_tags);
320
321
322
323
324
325
326
327
328static struct se_session *
329transport_init_session_tags(unsigned int tag_num, unsigned int tag_size,
330 enum target_prot_op sup_prot_ops)
331{
332 struct se_session *se_sess;
333 int rc;
334
335 if (tag_num != 0 && !tag_size) {
336 pr_err("init_session_tags called with percpu-ida tag_num:"
337 " %u, but zero tag_size\n", tag_num);
338 return ERR_PTR(-EINVAL);
339 }
340 if (!tag_num && tag_size) {
341 pr_err("init_session_tags called with percpu-ida tag_size:"
342 " %u, but zero tag_num\n", tag_size);
343 return ERR_PTR(-EINVAL);
344 }
345
346 se_sess = transport_alloc_session(sup_prot_ops);
347 if (IS_ERR(se_sess))
348 return se_sess;
349
350 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
351 if (rc < 0) {
352 transport_free_session(se_sess);
353 return ERR_PTR(-ENOMEM);
354 }
355
356 return se_sess;
357}
358
359
360
361
362void __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 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
369 unsigned char buf[PR_REG_ISID_LEN];
370 unsigned long flags;
371
372 se_sess->se_tpg = se_tpg;
373 se_sess->fabric_sess_ptr = fabric_sess_ptr;
374
375
376
377
378
379
380 if (se_nacl) {
381
382
383
384
385
386
387
388
389
390
391 if (se_nacl->saved_prot_type)
392 se_sess->sess_prot_type = se_nacl->saved_prot_type;
393 else if (tfo->tpg_check_prot_fabric_only)
394 se_sess->sess_prot_type = se_nacl->saved_prot_type =
395 tfo->tpg_check_prot_fabric_only(se_tpg);
396
397
398
399
400 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
401 memset(&buf[0], 0, PR_REG_ISID_LEN);
402 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
403 &buf[0], PR_REG_ISID_LEN);
404 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
405 }
406
407 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
408
409
410
411
412 se_nacl->nacl_sess = se_sess;
413
414 list_add_tail(&se_sess->sess_acl_list,
415 &se_nacl->acl_sess_list);
416 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
417 }
418 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
419
420 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
421 se_tpg->se_tpg_tfo->fabric_name, se_sess->fabric_sess_ptr);
422}
423EXPORT_SYMBOL(__transport_register_session);
424
425void transport_register_session(
426 struct se_portal_group *se_tpg,
427 struct se_node_acl *se_nacl,
428 struct se_session *se_sess,
429 void *fabric_sess_ptr)
430{
431 unsigned long flags;
432
433 spin_lock_irqsave(&se_tpg->session_lock, flags);
434 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
435 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
436}
437EXPORT_SYMBOL(transport_register_session);
438
439struct se_session *
440target_setup_session(struct se_portal_group *tpg,
441 unsigned int tag_num, unsigned int tag_size,
442 enum target_prot_op prot_op,
443 const char *initiatorname, void *private,
444 int (*callback)(struct se_portal_group *,
445 struct se_session *, void *))
446{
447 struct se_session *sess;
448
449
450
451
452
453 if (tag_num != 0)
454 sess = transport_init_session_tags(tag_num, tag_size, prot_op);
455 else
456 sess = transport_alloc_session(prot_op);
457
458 if (IS_ERR(sess))
459 return sess;
460
461 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
462 (unsigned char *)initiatorname);
463 if (!sess->se_node_acl) {
464 transport_free_session(sess);
465 return ERR_PTR(-EACCES);
466 }
467
468
469
470
471 if (callback != NULL) {
472 int rc = callback(tpg, sess, private);
473 if (rc) {
474 transport_free_session(sess);
475 return ERR_PTR(rc);
476 }
477 }
478
479 transport_register_session(tpg, sess->se_node_acl, sess, private);
480 return sess;
481}
482EXPORT_SYMBOL(target_setup_session);
483
484ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
485{
486 struct se_session *se_sess;
487 ssize_t len = 0;
488
489 spin_lock_bh(&se_tpg->session_lock);
490 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
491 if (!se_sess->se_node_acl)
492 continue;
493 if (!se_sess->se_node_acl->dynamic_node_acl)
494 continue;
495 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
496 break;
497
498 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
499 se_sess->se_node_acl->initiatorname);
500 len += 1;
501 }
502 spin_unlock_bh(&se_tpg->session_lock);
503
504 return len;
505}
506EXPORT_SYMBOL(target_show_dynamic_sessions);
507
508static void target_complete_nacl(struct kref *kref)
509{
510 struct se_node_acl *nacl = container_of(kref,
511 struct se_node_acl, acl_kref);
512 struct se_portal_group *se_tpg = nacl->se_tpg;
513
514 if (!nacl->dynamic_stop) {
515 complete(&nacl->acl_free_comp);
516 return;
517 }
518
519 mutex_lock(&se_tpg->acl_node_mutex);
520 list_del_init(&nacl->acl_list);
521 mutex_unlock(&se_tpg->acl_node_mutex);
522
523 core_tpg_wait_for_nacl_pr_ref(nacl);
524 core_free_device_list_for_node(nacl, se_tpg);
525 kfree(nacl);
526}
527
528void target_put_nacl(struct se_node_acl *nacl)
529{
530 kref_put(&nacl->acl_kref, target_complete_nacl);
531}
532EXPORT_SYMBOL(target_put_nacl);
533
534void transport_deregister_session_configfs(struct se_session *se_sess)
535{
536 struct se_node_acl *se_nacl;
537 unsigned long flags;
538
539
540
541 se_nacl = se_sess->se_node_acl;
542 if (se_nacl) {
543 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
544 if (!list_empty(&se_sess->sess_acl_list))
545 list_del_init(&se_sess->sess_acl_list);
546
547
548
549
550
551 if (list_empty(&se_nacl->acl_sess_list))
552 se_nacl->nacl_sess = NULL;
553 else {
554 se_nacl->nacl_sess = container_of(
555 se_nacl->acl_sess_list.prev,
556 struct se_session, sess_acl_list);
557 }
558 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
559 }
560}
561EXPORT_SYMBOL(transport_deregister_session_configfs);
562
563void transport_free_session(struct se_session *se_sess)
564{
565 struct se_node_acl *se_nacl = se_sess->se_node_acl;
566
567
568
569
570
571 if (se_nacl) {
572 struct se_portal_group *se_tpg = se_nacl->se_tpg;
573 const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo;
574 unsigned long flags;
575
576 se_sess->se_node_acl = NULL;
577
578
579
580
581
582
583 mutex_lock(&se_tpg->acl_node_mutex);
584 if (se_nacl->dynamic_node_acl &&
585 !se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
586 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
587 if (list_empty(&se_nacl->acl_sess_list))
588 se_nacl->dynamic_stop = true;
589 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
590
591 if (se_nacl->dynamic_stop)
592 list_del_init(&se_nacl->acl_list);
593 }
594 mutex_unlock(&se_tpg->acl_node_mutex);
595
596 if (se_nacl->dynamic_stop)
597 target_put_nacl(se_nacl);
598
599 target_put_nacl(se_nacl);
600 }
601 if (se_sess->sess_cmd_map) {
602 sbitmap_queue_free(&se_sess->sess_tag_pool);
603 kvfree(se_sess->sess_cmd_map);
604 }
605 transport_uninit_session(se_sess);
606 kmem_cache_free(se_sess_cache, se_sess);
607}
608EXPORT_SYMBOL(transport_free_session);
609
610static int target_release_res(struct se_device *dev, void *data)
611{
612 struct se_session *sess = data;
613
614 if (dev->reservation_holder == sess)
615 target_release_reservation(dev);
616 return 0;
617}
618
619void transport_deregister_session(struct se_session *se_sess)
620{
621 struct se_portal_group *se_tpg = se_sess->se_tpg;
622 unsigned long flags;
623
624 if (!se_tpg) {
625 transport_free_session(se_sess);
626 return;
627 }
628
629 spin_lock_irqsave(&se_tpg->session_lock, flags);
630 list_del(&se_sess->sess_list);
631 se_sess->se_tpg = NULL;
632 se_sess->fabric_sess_ptr = NULL;
633 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
634
635
636
637
638
639 target_for_each_device(target_release_res, se_sess);
640
641 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
642 se_tpg->se_tpg_tfo->fabric_name);
643
644
645
646
647
648
649
650
651
652 transport_free_session(se_sess);
653}
654EXPORT_SYMBOL(transport_deregister_session);
655
656void target_remove_session(struct se_session *se_sess)
657{
658 transport_deregister_session_configfs(se_sess);
659 transport_deregister_session(se_sess);
660}
661EXPORT_SYMBOL(target_remove_session);
662
663static void target_remove_from_state_list(struct se_cmd *cmd)
664{
665 struct se_device *dev = cmd->se_dev;
666 unsigned long flags;
667
668 if (!dev)
669 return;
670
671 spin_lock_irqsave(&dev->queues[cmd->cpuid].lock, flags);
672 if (cmd->state_active) {
673 list_del(&cmd->state_list);
674 cmd->state_active = false;
675 }
676 spin_unlock_irqrestore(&dev->queues[cmd->cpuid].lock, flags);
677}
678
679static void target_remove_from_tmr_list(struct se_cmd *cmd)
680{
681 struct se_device *dev = NULL;
682 unsigned long flags;
683
684 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
685 dev = cmd->se_tmr_req->tmr_dev;
686
687 if (dev) {
688 spin_lock_irqsave(&dev->se_tmr_lock, flags);
689 if (cmd->se_tmr_req->tmr_dev)
690 list_del_init(&cmd->se_tmr_req->tmr_list);
691 spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
692 }
693}
694
695
696
697
698
699
700
701static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
702{
703 unsigned long flags;
704
705 spin_lock_irqsave(&cmd->t_state_lock, flags);
706
707
708
709
710 if (cmd->transport_state & CMD_T_STOP) {
711 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
712 __func__, __LINE__, cmd->tag);
713
714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
715
716 complete_all(&cmd->t_transport_stop_comp);
717 return 1;
718 }
719 cmd->transport_state &= ~CMD_T_ACTIVE;
720 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
721
722
723
724
725
726
727
728
729 return cmd->se_tfo->check_stop_free(cmd);
730}
731
732static void transport_lun_remove_cmd(struct se_cmd *cmd)
733{
734 struct se_lun *lun = cmd->se_lun;
735
736 if (!lun)
737 return;
738
739 target_remove_from_state_list(cmd);
740 target_remove_from_tmr_list(cmd);
741
742 if (cmpxchg(&cmd->lun_ref_active, true, false))
743 percpu_ref_put(&lun->lun_ref);
744
745
746
747
748 cmd->se_lun = NULL;
749}
750
751static void target_complete_failure_work(struct work_struct *work)
752{
753 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
754
755 transport_generic_request_failure(cmd, cmd->sense_reason);
756}
757
758
759
760
761
762static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
763{
764 struct se_device *dev = cmd->se_dev;
765
766 WARN_ON(!cmd->se_lun);
767
768 if (!dev)
769 return NULL;
770
771 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
772 return NULL;
773
774 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
775
776 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
777 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
778 return cmd->sense_buffer;
779}
780
781void transport_copy_sense_to_cmd(struct se_cmd *cmd, unsigned char *sense)
782{
783 unsigned char *cmd_sense_buf;
784 unsigned long flags;
785
786 spin_lock_irqsave(&cmd->t_state_lock, flags);
787 cmd_sense_buf = transport_get_sense_buffer(cmd);
788 if (!cmd_sense_buf) {
789 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
790 return;
791 }
792
793 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
794 memcpy(cmd_sense_buf, sense, cmd->scsi_sense_length);
795 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
796}
797EXPORT_SYMBOL(transport_copy_sense_to_cmd);
798
799static void target_handle_abort(struct se_cmd *cmd)
800{
801 bool tas = cmd->transport_state & CMD_T_TAS;
802 bool ack_kref = cmd->se_cmd_flags & SCF_ACK_KREF;
803 int ret;
804
805 pr_debug("tag %#llx: send_abort_response = %d\n", cmd->tag, tas);
806
807 if (tas) {
808 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
809 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
810 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
811 cmd->t_task_cdb[0], cmd->tag);
812 trace_target_cmd_complete(cmd);
813 ret = cmd->se_tfo->queue_status(cmd);
814 if (ret) {
815 transport_handle_queue_full(cmd, cmd->se_dev,
816 ret, false);
817 return;
818 }
819 } else {
820 cmd->se_tmr_req->response = TMR_FUNCTION_REJECTED;
821 cmd->se_tfo->queue_tm_rsp(cmd);
822 }
823 } else {
824
825
826
827
828 cmd->se_tfo->aborted_task(cmd);
829 if (ack_kref)
830 WARN_ON_ONCE(target_put_sess_cmd(cmd) != 0);
831
832
833
834
835
836 }
837
838 WARN_ON_ONCE(kref_read(&cmd->cmd_kref) == 0);
839
840 transport_lun_remove_cmd(cmd);
841
842 transport_cmd_check_stop_to_fabric(cmd);
843}
844
845static void target_abort_work(struct work_struct *work)
846{
847 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
848
849 target_handle_abort(cmd);
850}
851
852static bool target_cmd_interrupted(struct se_cmd *cmd)
853{
854 int post_ret;
855
856 if (cmd->transport_state & CMD_T_ABORTED) {
857 if (cmd->transport_complete_callback)
858 cmd->transport_complete_callback(cmd, false, &post_ret);
859 INIT_WORK(&cmd->work, target_abort_work);
860 queue_work(target_completion_wq, &cmd->work);
861 return true;
862 } else if (cmd->transport_state & CMD_T_STOP) {
863 if (cmd->transport_complete_callback)
864 cmd->transport_complete_callback(cmd, false, &post_ret);
865 complete_all(&cmd->t_transport_stop_comp);
866 return true;
867 }
868
869 return false;
870}
871
872
873void target_complete_cmd_with_sense(struct se_cmd *cmd, u8 scsi_status,
874 sense_reason_t sense_reason)
875{
876 struct se_wwn *wwn = cmd->se_sess->se_tpg->se_tpg_wwn;
877 int success, cpu;
878 unsigned long flags;
879
880 if (target_cmd_interrupted(cmd))
881 return;
882
883 cmd->scsi_status = scsi_status;
884 cmd->sense_reason = sense_reason;
885
886 spin_lock_irqsave(&cmd->t_state_lock, flags);
887 switch (cmd->scsi_status) {
888 case SAM_STAT_CHECK_CONDITION:
889 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
890 success = 1;
891 else
892 success = 0;
893 break;
894 default:
895 success = 1;
896 break;
897 }
898
899 cmd->t_state = TRANSPORT_COMPLETE;
900 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
901 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
902
903 INIT_WORK(&cmd->work, success ? target_complete_ok_work :
904 target_complete_failure_work);
905
906 if (!wwn || wwn->cmd_compl_affinity == SE_COMPL_AFFINITY_CPUID)
907 cpu = cmd->cpuid;
908 else
909 cpu = wwn->cmd_compl_affinity;
910
911 queue_work_on(cpu, target_completion_wq, &cmd->work);
912}
913EXPORT_SYMBOL(target_complete_cmd_with_sense);
914
915void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
916{
917 target_complete_cmd_with_sense(cmd, scsi_status, scsi_status ?
918 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE :
919 TCM_NO_SENSE);
920}
921EXPORT_SYMBOL(target_complete_cmd);
922
923void target_set_cmd_data_length(struct se_cmd *cmd, int length)
924{
925 if (length < cmd->data_length) {
926 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
927 cmd->residual_count += cmd->data_length - length;
928 } else {
929 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
930 cmd->residual_count = cmd->data_length - length;
931 }
932
933 cmd->data_length = length;
934 }
935}
936EXPORT_SYMBOL(target_set_cmd_data_length);
937
938void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
939{
940 if (scsi_status == SAM_STAT_GOOD ||
941 cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) {
942 target_set_cmd_data_length(cmd, length);
943 }
944
945 target_complete_cmd(cmd, scsi_status);
946}
947EXPORT_SYMBOL(target_complete_cmd_with_length);
948
949static void target_add_to_state_list(struct se_cmd *cmd)
950{
951 struct se_device *dev = cmd->se_dev;
952 unsigned long flags;
953
954 spin_lock_irqsave(&dev->queues[cmd->cpuid].lock, flags);
955 if (!cmd->state_active) {
956 list_add_tail(&cmd->state_list,
957 &dev->queues[cmd->cpuid].state_list);
958 cmd->state_active = true;
959 }
960 spin_unlock_irqrestore(&dev->queues[cmd->cpuid].lock, flags);
961}
962
963
964
965
966static void transport_write_pending_qf(struct se_cmd *cmd);
967static void transport_complete_qf(struct se_cmd *cmd);
968
969void target_qf_do_work(struct work_struct *work)
970{
971 struct se_device *dev = container_of(work, struct se_device,
972 qf_work_queue);
973 LIST_HEAD(qf_cmd_list);
974 struct se_cmd *cmd, *cmd_tmp;
975
976 spin_lock_irq(&dev->qf_cmd_lock);
977 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
978 spin_unlock_irq(&dev->qf_cmd_lock);
979
980 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
981 list_del(&cmd->se_qf_node);
982 atomic_dec_mb(&dev->dev_qf_count);
983
984 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
985 " context: %s\n", cmd->se_tfo->fabric_name, cmd,
986 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
987 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
988 : "UNKNOWN");
989
990 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
991 transport_write_pending_qf(cmd);
992 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK ||
993 cmd->t_state == TRANSPORT_COMPLETE_QF_ERR)
994 transport_complete_qf(cmd);
995 }
996}
997
998unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
999{
1000 switch (cmd->data_direction) {
1001 case DMA_NONE:
1002 return "NONE";
1003 case DMA_FROM_DEVICE:
1004 return "READ";
1005 case DMA_TO_DEVICE:
1006 return "WRITE";
1007 case DMA_BIDIRECTIONAL:
1008 return "BIDI";
1009 default:
1010 break;
1011 }
1012
1013 return "UNKNOWN";
1014}
1015
1016void transport_dump_dev_state(
1017 struct se_device *dev,
1018 char *b,
1019 int *bl)
1020{
1021 *bl += sprintf(b + *bl, "Status: ");
1022 if (dev->export_count)
1023 *bl += sprintf(b + *bl, "ACTIVATED");
1024 else
1025 *bl += sprintf(b + *bl, "DEACTIVATED");
1026
1027 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
1028 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
1029 dev->dev_attrib.block_size,
1030 dev->dev_attrib.hw_max_sectors);
1031 *bl += sprintf(b + *bl, " ");
1032}
1033
1034void transport_dump_vpd_proto_id(
1035 struct t10_vpd *vpd,
1036 unsigned char *p_buf,
1037 int p_buf_len)
1038{
1039 unsigned char buf[VPD_TMP_BUF_SIZE];
1040 int len;
1041
1042 memset(buf, 0, VPD_TMP_BUF_SIZE);
1043 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1044
1045 switch (vpd->protocol_identifier) {
1046 case 0x00:
1047 sprintf(buf+len, "Fibre Channel\n");
1048 break;
1049 case 0x10:
1050 sprintf(buf+len, "Parallel SCSI\n");
1051 break;
1052 case 0x20:
1053 sprintf(buf+len, "SSA\n");
1054 break;
1055 case 0x30:
1056 sprintf(buf+len, "IEEE 1394\n");
1057 break;
1058 case 0x40:
1059 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1060 " Protocol\n");
1061 break;
1062 case 0x50:
1063 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1064 break;
1065 case 0x60:
1066 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1067 break;
1068 case 0x70:
1069 sprintf(buf+len, "Automation/Drive Interface Transport"
1070 " Protocol\n");
1071 break;
1072 case 0x80:
1073 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1074 break;
1075 default:
1076 sprintf(buf+len, "Unknown 0x%02x\n",
1077 vpd->protocol_identifier);
1078 break;
1079 }
1080
1081 if (p_buf)
1082 strncpy(p_buf, buf, p_buf_len);
1083 else
1084 pr_debug("%s", buf);
1085}
1086
1087void
1088transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1089{
1090
1091
1092
1093
1094
1095 if (page_83[1] & 0x80) {
1096 vpd->protocol_identifier = (page_83[0] & 0xf0);
1097 vpd->protocol_identifier_set = 1;
1098 transport_dump_vpd_proto_id(vpd, NULL, 0);
1099 }
1100}
1101EXPORT_SYMBOL(transport_set_vpd_proto_id);
1102
1103int transport_dump_vpd_assoc(
1104 struct t10_vpd *vpd,
1105 unsigned char *p_buf,
1106 int p_buf_len)
1107{
1108 unsigned char buf[VPD_TMP_BUF_SIZE];
1109 int ret = 0;
1110 int len;
1111
1112 memset(buf, 0, VPD_TMP_BUF_SIZE);
1113 len = sprintf(buf, "T10 VPD Identifier Association: ");
1114
1115 switch (vpd->association) {
1116 case 0x00:
1117 sprintf(buf+len, "addressed logical unit\n");
1118 break;
1119 case 0x10:
1120 sprintf(buf+len, "target port\n");
1121 break;
1122 case 0x20:
1123 sprintf(buf+len, "SCSI target device\n");
1124 break;
1125 default:
1126 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1127 ret = -EINVAL;
1128 break;
1129 }
1130
1131 if (p_buf)
1132 strncpy(p_buf, buf, p_buf_len);
1133 else
1134 pr_debug("%s", buf);
1135
1136 return ret;
1137}
1138
1139int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1140{
1141
1142
1143
1144
1145
1146 vpd->association = (page_83[1] & 0x30);
1147 return transport_dump_vpd_assoc(vpd, NULL, 0);
1148}
1149EXPORT_SYMBOL(transport_set_vpd_assoc);
1150
1151int transport_dump_vpd_ident_type(
1152 struct t10_vpd *vpd,
1153 unsigned char *p_buf,
1154 int p_buf_len)
1155{
1156 unsigned char buf[VPD_TMP_BUF_SIZE];
1157 int ret = 0;
1158 int len;
1159
1160 memset(buf, 0, VPD_TMP_BUF_SIZE);
1161 len = sprintf(buf, "T10 VPD Identifier Type: ");
1162
1163 switch (vpd->device_identifier_type) {
1164 case 0x00:
1165 sprintf(buf+len, "Vendor specific\n");
1166 break;
1167 case 0x01:
1168 sprintf(buf+len, "T10 Vendor ID based\n");
1169 break;
1170 case 0x02:
1171 sprintf(buf+len, "EUI-64 based\n");
1172 break;
1173 case 0x03:
1174 sprintf(buf+len, "NAA\n");
1175 break;
1176 case 0x04:
1177 sprintf(buf+len, "Relative target port identifier\n");
1178 break;
1179 case 0x08:
1180 sprintf(buf+len, "SCSI name string\n");
1181 break;
1182 default:
1183 sprintf(buf+len, "Unsupported: 0x%02x\n",
1184 vpd->device_identifier_type);
1185 ret = -EINVAL;
1186 break;
1187 }
1188
1189 if (p_buf) {
1190 if (p_buf_len < strlen(buf)+1)
1191 return -EINVAL;
1192 strncpy(p_buf, buf, p_buf_len);
1193 } else {
1194 pr_debug("%s", buf);
1195 }
1196
1197 return ret;
1198}
1199
1200int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1201{
1202
1203
1204
1205
1206
1207 vpd->device_identifier_type = (page_83[1] & 0x0f);
1208 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1209}
1210EXPORT_SYMBOL(transport_set_vpd_ident_type);
1211
1212int transport_dump_vpd_ident(
1213 struct t10_vpd *vpd,
1214 unsigned char *p_buf,
1215 int p_buf_len)
1216{
1217 unsigned char buf[VPD_TMP_BUF_SIZE];
1218 int ret = 0;
1219
1220 memset(buf, 0, VPD_TMP_BUF_SIZE);
1221
1222 switch (vpd->device_identifier_code_set) {
1223 case 0x01:
1224 snprintf(buf, sizeof(buf),
1225 "T10 VPD Binary Device Identifier: %s\n",
1226 &vpd->device_identifier[0]);
1227 break;
1228 case 0x02:
1229 snprintf(buf, sizeof(buf),
1230 "T10 VPD ASCII Device Identifier: %s\n",
1231 &vpd->device_identifier[0]);
1232 break;
1233 case 0x03:
1234 snprintf(buf, sizeof(buf),
1235 "T10 VPD UTF-8 Device Identifier: %s\n",
1236 &vpd->device_identifier[0]);
1237 break;
1238 default:
1239 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1240 " 0x%02x", vpd->device_identifier_code_set);
1241 ret = -EINVAL;
1242 break;
1243 }
1244
1245 if (p_buf)
1246 strncpy(p_buf, buf, p_buf_len);
1247 else
1248 pr_debug("%s", buf);
1249
1250 return ret;
1251}
1252
1253int
1254transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1255{
1256 static const char hex_str[] = "0123456789abcdef";
1257 int j = 0, i = 4;
1258
1259
1260
1261
1262
1263
1264 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1265 switch (vpd->device_identifier_code_set) {
1266 case 0x01:
1267 vpd->device_identifier[j++] =
1268 hex_str[vpd->device_identifier_type];
1269 while (i < (4 + page_83[3])) {
1270 vpd->device_identifier[j++] =
1271 hex_str[(page_83[i] & 0xf0) >> 4];
1272 vpd->device_identifier[j++] =
1273 hex_str[page_83[i] & 0x0f];
1274 i++;
1275 }
1276 break;
1277 case 0x02:
1278 case 0x03:
1279 while (i < (4 + page_83[3]))
1280 vpd->device_identifier[j++] = page_83[i++];
1281 break;
1282 default:
1283 break;
1284 }
1285
1286 return transport_dump_vpd_ident(vpd, NULL, 0);
1287}
1288EXPORT_SYMBOL(transport_set_vpd_ident);
1289
1290static sense_reason_t
1291target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1292 unsigned int size)
1293{
1294 u32 mtl;
1295
1296 if (!cmd->se_tfo->max_data_sg_nents)
1297 return TCM_NO_SENSE;
1298
1299
1300
1301
1302
1303
1304 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1305 if (cmd->data_length > mtl) {
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1318 cmd->residual_count = (size - mtl);
1319 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1320 u32 orig_dl = size + cmd->residual_count;
1321 cmd->residual_count = (orig_dl - mtl);
1322 } else {
1323 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1324 cmd->residual_count = (cmd->data_length - mtl);
1325 }
1326 cmd->data_length = mtl;
1327
1328
1329
1330
1331 if (cmd->prot_length) {
1332 u32 sectors = (mtl / dev->dev_attrib.block_size);
1333 cmd->prot_length = dev->prot_length * sectors;
1334 }
1335 }
1336 return TCM_NO_SENSE;
1337}
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352sense_reason_t
1353target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1354{
1355 struct se_device *dev = cmd->se_dev;
1356
1357 if (cmd->unknown_data_length) {
1358 cmd->data_length = size;
1359 } else if (size != cmd->data_length) {
1360 pr_warn_ratelimited("TARGET_CORE[%s]: Expected Transfer Length:"
1361 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1362 " 0x%02x\n", cmd->se_tfo->fabric_name,
1363 cmd->data_length, size, cmd->t_task_cdb[0]);
1364
1365
1366
1367
1368
1369
1370 if (size > cmd->data_length) {
1371 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1372 cmd->residual_count = (size - cmd->data_length);
1373 } else {
1374 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1375 cmd->residual_count = (cmd->data_length - size);
1376
1377
1378
1379
1380 if (cmd->data_direction == DMA_FROM_DEVICE) {
1381 cmd->data_length = size;
1382 }
1383 }
1384
1385 if (cmd->data_direction == DMA_TO_DEVICE) {
1386 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1387 pr_err_ratelimited("Rejecting underflow/overflow"
1388 " for WRITE data CDB\n");
1389 return TCM_INVALID_FIELD_IN_COMMAND_IU;
1390 }
1391
1392
1393
1394
1395
1396
1397 if (size > cmd->data_length) {
1398 pr_err_ratelimited("Rejecting overflow for"
1399 " WRITE control CDB\n");
1400 return TCM_INVALID_CDB_FIELD;
1401 }
1402 }
1403 }
1404
1405 return target_check_max_data_sg_nents(cmd, dev, size);
1406
1407}
1408
1409
1410
1411
1412
1413
1414
1415void __target_init_cmd(
1416 struct se_cmd *cmd,
1417 const struct target_core_fabric_ops *tfo,
1418 struct se_session *se_sess,
1419 u32 data_length,
1420 int data_direction,
1421 int task_attr,
1422 unsigned char *sense_buffer, u64 unpacked_lun)
1423{
1424 INIT_LIST_HEAD(&cmd->se_delayed_node);
1425 INIT_LIST_HEAD(&cmd->se_qf_node);
1426 INIT_LIST_HEAD(&cmd->state_list);
1427 init_completion(&cmd->t_transport_stop_comp);
1428 cmd->free_compl = NULL;
1429 cmd->abrt_compl = NULL;
1430 spin_lock_init(&cmd->t_state_lock);
1431 INIT_WORK(&cmd->work, NULL);
1432 kref_init(&cmd->cmd_kref);
1433
1434 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1435 cmd->se_tfo = tfo;
1436 cmd->se_sess = se_sess;
1437 cmd->data_length = data_length;
1438 cmd->data_direction = data_direction;
1439 cmd->sam_task_attr = task_attr;
1440 cmd->sense_buffer = sense_buffer;
1441 cmd->orig_fe_lun = unpacked_lun;
1442
1443 if (!(cmd->se_cmd_flags & SCF_USE_CPUID))
1444 cmd->cpuid = raw_smp_processor_id();
1445
1446 cmd->state_active = false;
1447}
1448EXPORT_SYMBOL(__target_init_cmd);
1449
1450static sense_reason_t
1451transport_check_alloc_task_attr(struct se_cmd *cmd)
1452{
1453 struct se_device *dev = cmd->se_dev;
1454
1455
1456
1457
1458
1459 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
1460 return 0;
1461
1462 if (cmd->sam_task_attr == TCM_ACA_TAG) {
1463 pr_debug("SAM Task Attribute ACA"
1464 " emulation is not supported\n");
1465 return TCM_INVALID_CDB_FIELD;
1466 }
1467
1468 return 0;
1469}
1470
1471sense_reason_t
1472target_cmd_init_cdb(struct se_cmd *cmd, unsigned char *cdb, gfp_t gfp)
1473{
1474 sense_reason_t ret;
1475
1476
1477
1478
1479
1480 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1481 pr_err("Received SCSI CDB with command_size: %d that"
1482 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1483 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1484 ret = TCM_INVALID_CDB_FIELD;
1485 goto err;
1486 }
1487
1488
1489
1490
1491
1492 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1493 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), gfp);
1494 if (!cmd->t_task_cdb) {
1495 pr_err("Unable to allocate cmd->t_task_cdb"
1496 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1497 scsi_command_size(cdb),
1498 (unsigned long)sizeof(cmd->__t_task_cdb));
1499 ret = TCM_OUT_OF_RESOURCES;
1500 goto err;
1501 }
1502 }
1503
1504
1505
1506 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1507
1508 trace_target_sequencer_start(cmd);
1509 return 0;
1510
1511err:
1512
1513
1514
1515
1516 memcpy(cmd->t_task_cdb, cdb, min(scsi_command_size(cdb),
1517 (unsigned int)TCM_MAX_COMMAND_SIZE));
1518 return ret;
1519}
1520EXPORT_SYMBOL(target_cmd_init_cdb);
1521
1522sense_reason_t
1523target_cmd_parse_cdb(struct se_cmd *cmd)
1524{
1525 struct se_device *dev = cmd->se_dev;
1526 sense_reason_t ret;
1527
1528 ret = dev->transport->parse_cdb(cmd);
1529 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1530 pr_debug_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1531 cmd->se_tfo->fabric_name,
1532 cmd->se_sess->se_node_acl->initiatorname,
1533 cmd->t_task_cdb[0]);
1534 if (ret)
1535 return ret;
1536
1537 ret = transport_check_alloc_task_attr(cmd);
1538 if (ret)
1539 return ret;
1540
1541 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1542 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
1543 return 0;
1544}
1545EXPORT_SYMBOL(target_cmd_parse_cdb);
1546
1547
1548
1549
1550
1551int transport_handle_cdb_direct(
1552 struct se_cmd *cmd)
1553{
1554 sense_reason_t ret;
1555
1556 might_sleep();
1557
1558 if (!cmd->se_lun) {
1559 dump_stack();
1560 pr_err("cmd->se_lun is NULL\n");
1561 return -EINVAL;
1562 }
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572 cmd->t_state = TRANSPORT_NEW_CMD;
1573 cmd->transport_state |= CMD_T_ACTIVE;
1574
1575
1576
1577
1578
1579
1580 ret = transport_generic_new_cmd(cmd);
1581 if (ret)
1582 transport_generic_request_failure(cmd, ret);
1583 return 0;
1584}
1585EXPORT_SYMBOL(transport_handle_cdb_direct);
1586
1587sense_reason_t
1588transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1589 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1590{
1591 if (!sgl || !sgl_count)
1592 return 0;
1593
1594
1595
1596
1597
1598
1599 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1600 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1601 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1602 return TCM_INVALID_CDB_FIELD;
1603 }
1604
1605 cmd->t_data_sg = sgl;
1606 cmd->t_data_nents = sgl_count;
1607 cmd->t_bidi_data_sg = sgl_bidi;
1608 cmd->t_bidi_data_nents = sgl_bidi_count;
1609
1610 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1611 return 0;
1612}
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635int target_init_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1636 unsigned char *sense, u64 unpacked_lun,
1637 u32 data_length, int task_attr, int data_dir, int flags)
1638{
1639 struct se_portal_group *se_tpg;
1640
1641 se_tpg = se_sess->se_tpg;
1642 BUG_ON(!se_tpg);
1643 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1644
1645 if (flags & TARGET_SCF_USE_CPUID)
1646 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1647
1648
1649
1650 if (flags & TARGET_SCF_BIDI_OP)
1651 se_cmd->se_cmd_flags |= SCF_BIDI;
1652
1653 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1654 se_cmd->unknown_data_length = 1;
1655
1656
1657
1658
1659
1660 __target_init_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, data_length,
1661 data_dir, task_attr, sense, unpacked_lun);
1662
1663
1664
1665
1666
1667
1668 return target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1669}
1670EXPORT_SYMBOL_GPL(target_init_cmd);
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691int target_submit_prep(struct se_cmd *se_cmd, unsigned char *cdb,
1692 struct scatterlist *sgl, u32 sgl_count,
1693 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1694 struct scatterlist *sgl_prot, u32 sgl_prot_count,
1695 gfp_t gfp)
1696{
1697 sense_reason_t rc;
1698
1699 rc = target_cmd_init_cdb(se_cmd, cdb, gfp);
1700 if (rc)
1701 goto send_cc_direct;
1702
1703
1704
1705
1706 rc = transport_lookup_cmd_lun(se_cmd);
1707 if (rc)
1708 goto send_cc_direct;
1709
1710 rc = target_cmd_parse_cdb(se_cmd);
1711 if (rc != 0)
1712 goto generic_fail;
1713
1714
1715
1716
1717
1718 if (sgl_prot_count) {
1719 se_cmd->t_prot_sg = sgl_prot;
1720 se_cmd->t_prot_nents = sgl_prot_count;
1721 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
1722 }
1723
1724
1725
1726
1727
1728
1729 if (sgl_count != 0) {
1730 BUG_ON(!sgl);
1731
1732 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1733 sgl_bidi, sgl_bidi_count);
1734 if (rc != 0)
1735 goto generic_fail;
1736 }
1737
1738 return 0;
1739
1740send_cc_direct:
1741 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1742 target_put_sess_cmd(se_cmd);
1743 return -EIO;
1744
1745generic_fail:
1746 transport_generic_request_failure(se_cmd, rc);
1747 return -EIO;
1748}
1749EXPORT_SYMBOL_GPL(target_submit_prep);
1750
1751
1752
1753
1754
1755
1756
1757
1758void target_submit(struct se_cmd *se_cmd)
1759{
1760 struct scatterlist *sgl = se_cmd->t_data_sg;
1761 unsigned char *buf = NULL;
1762
1763 might_sleep();
1764
1765 if (se_cmd->t_data_nents != 0) {
1766 BUG_ON(!sgl);
1767
1768
1769
1770
1771
1772
1773
1774
1775 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1776 se_cmd->data_direction == DMA_FROM_DEVICE) {
1777 if (sgl)
1778 buf = kmap(sg_page(sgl)) + sgl->offset;
1779
1780 if (buf) {
1781 memset(buf, 0, sgl->length);
1782 kunmap(sg_page(sgl));
1783 }
1784 }
1785
1786 }
1787
1788
1789
1790
1791
1792 core_alua_check_nonop_delay(se_cmd);
1793
1794 transport_handle_cdb_direct(se_cmd);
1795}
1796EXPORT_SYMBOL_GPL(target_submit);
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1824 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
1825 u32 data_length, int task_attr, int data_dir, int flags)
1826{
1827 int rc;
1828
1829 rc = target_init_cmd(se_cmd, se_sess, sense, unpacked_lun, data_length,
1830 task_attr, data_dir, flags);
1831 WARN(rc, "Invalid target_submit_cmd use. Driver must not use target_stop_session or call target_init_cmd directly.\n");
1832 if (rc)
1833 return;
1834
1835 if (target_submit_prep(se_cmd, cdb, NULL, 0, NULL, 0, NULL, 0,
1836 GFP_KERNEL))
1837 return;
1838
1839 target_submit(se_cmd);
1840}
1841EXPORT_SYMBOL(target_submit_cmd);
1842
1843
1844static struct se_dev_plug *target_plug_device(struct se_device *se_dev)
1845{
1846 struct se_dev_plug *se_plug;
1847
1848 if (!se_dev->transport->plug_device)
1849 return NULL;
1850
1851 se_plug = se_dev->transport->plug_device(se_dev);
1852 if (!se_plug)
1853 return NULL;
1854
1855 se_plug->se_dev = se_dev;
1856
1857
1858
1859
1860
1861 config_group_get(&se_dev->dev_group);
1862 return se_plug;
1863}
1864
1865static void target_unplug_device(struct se_dev_plug *se_plug)
1866{
1867 struct se_device *se_dev = se_plug->se_dev;
1868
1869 se_dev->transport->unplug_device(se_plug);
1870 config_group_put(&se_dev->dev_group);
1871}
1872
1873void target_queued_submit_work(struct work_struct *work)
1874{
1875 struct se_cmd_queue *sq = container_of(work, struct se_cmd_queue, work);
1876 struct se_cmd *se_cmd, *next_cmd;
1877 struct se_dev_plug *se_plug = NULL;
1878 struct se_device *se_dev = NULL;
1879 struct llist_node *cmd_list;
1880
1881 cmd_list = llist_del_all(&sq->cmd_list);
1882 if (!cmd_list)
1883
1884 return;
1885
1886 cmd_list = llist_reverse_order(cmd_list);
1887 llist_for_each_entry_safe(se_cmd, next_cmd, cmd_list, se_cmd_list) {
1888 if (!se_dev) {
1889 se_dev = se_cmd->se_dev;
1890 se_plug = target_plug_device(se_dev);
1891 }
1892
1893 target_submit(se_cmd);
1894 }
1895
1896 if (se_plug)
1897 target_unplug_device(se_plug);
1898}
1899
1900
1901
1902
1903
1904void target_queue_submission(struct se_cmd *se_cmd)
1905{
1906 struct se_device *se_dev = se_cmd->se_dev;
1907 int cpu = se_cmd->cpuid;
1908 struct se_cmd_queue *sq;
1909
1910 sq = &se_dev->queues[cpu].sq;
1911 llist_add(&se_cmd->se_cmd_list, &sq->cmd_list);
1912 queue_work_on(cpu, target_submission_wq, &sq->work);
1913}
1914EXPORT_SYMBOL_GPL(target_queue_submission);
1915
1916static void target_complete_tmr_failure(struct work_struct *work)
1917{
1918 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1919
1920 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1921 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1922
1923 transport_lun_remove_cmd(se_cmd);
1924 transport_cmd_check_stop_to_fabric(se_cmd);
1925}
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1945 unsigned char *sense, u64 unpacked_lun,
1946 void *fabric_tmr_ptr, unsigned char tm_type,
1947 gfp_t gfp, u64 tag, int flags)
1948{
1949 struct se_portal_group *se_tpg;
1950 int ret;
1951
1952 se_tpg = se_sess->se_tpg;
1953 BUG_ON(!se_tpg);
1954
1955 __target_init_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1956 0, DMA_NONE, TCM_SIMPLE_TAG, sense, unpacked_lun);
1957
1958
1959
1960
1961 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1962 if (ret < 0)
1963 return -ENOMEM;
1964
1965 if (tm_type == TMR_ABORT_TASK)
1966 se_cmd->se_tmr_req->ref_task_tag = tag;
1967
1968
1969 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
1970 if (ret) {
1971 core_tmr_release_req(se_cmd->se_tmr_req);
1972 return ret;
1973 }
1974
1975 ret = transport_lookup_tmr_lun(se_cmd);
1976 if (ret)
1977 goto failure;
1978
1979 transport_generic_handle_tmr(se_cmd);
1980 return 0;
1981
1982
1983
1984
1985
1986failure:
1987 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1988 schedule_work(&se_cmd->work);
1989 return 0;
1990}
1991EXPORT_SYMBOL(target_submit_tmr);
1992
1993
1994
1995
1996void transport_generic_request_failure(struct se_cmd *cmd,
1997 sense_reason_t sense_reason)
1998{
1999 int ret = 0, post_ret;
2000
2001 pr_debug("-----[ Storage Engine Exception; sense_reason %d\n",
2002 sense_reason);
2003 target_show_cmd("-----[ ", cmd);
2004
2005
2006
2007
2008 transport_complete_task_attr(cmd);
2009
2010 if (cmd->transport_complete_callback)
2011 cmd->transport_complete_callback(cmd, false, &post_ret);
2012
2013 if (cmd->transport_state & CMD_T_ABORTED) {
2014 INIT_WORK(&cmd->work, target_abort_work);
2015 queue_work(target_completion_wq, &cmd->work);
2016 return;
2017 }
2018
2019 switch (sense_reason) {
2020 case TCM_NON_EXISTENT_LUN:
2021 case TCM_UNSUPPORTED_SCSI_OPCODE:
2022 case TCM_INVALID_CDB_FIELD:
2023 case TCM_INVALID_PARAMETER_LIST:
2024 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2025 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2026 case TCM_UNKNOWN_MODE_PAGE:
2027 case TCM_WRITE_PROTECTED:
2028 case TCM_ADDRESS_OUT_OF_RANGE:
2029 case TCM_CHECK_CONDITION_ABORT_CMD:
2030 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2031 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2032 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2033 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2034 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
2035 case TCM_TOO_MANY_TARGET_DESCS:
2036 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE:
2037 case TCM_TOO_MANY_SEGMENT_DESCS:
2038 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE:
2039 case TCM_INVALID_FIELD_IN_COMMAND_IU:
2040 case TCM_ALUA_TG_PT_STANDBY:
2041 case TCM_ALUA_TG_PT_UNAVAILABLE:
2042 case TCM_ALUA_STATE_TRANSITION:
2043 case TCM_ALUA_OFFLINE:
2044 break;
2045 case TCM_OUT_OF_RESOURCES:
2046 cmd->scsi_status = SAM_STAT_TASK_SET_FULL;
2047 goto queue_status;
2048 case TCM_LUN_BUSY:
2049 cmd->scsi_status = SAM_STAT_BUSY;
2050 goto queue_status;
2051 case TCM_RESERVATION_CONFLICT:
2052
2053
2054
2055
2056
2057
2058 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2059
2060
2061
2062
2063
2064
2065
2066 if (cmd->se_sess &&
2067 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl
2068 == TARGET_UA_INTLCK_CTRL_ESTABLISH_UA) {
2069 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
2070 cmd->orig_fe_lun, 0x2C,
2071 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2072 }
2073
2074 goto queue_status;
2075 default:
2076 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
2077 cmd->t_task_cdb[0], sense_reason);
2078 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2079 break;
2080 }
2081
2082 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
2083 if (ret)
2084 goto queue_full;
2085
2086check_stop:
2087 transport_lun_remove_cmd(cmd);
2088 transport_cmd_check_stop_to_fabric(cmd);
2089 return;
2090
2091queue_status:
2092 trace_target_cmd_complete(cmd);
2093 ret = cmd->se_tfo->queue_status(cmd);
2094 if (!ret)
2095 goto check_stop;
2096queue_full:
2097 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
2098}
2099EXPORT_SYMBOL(transport_generic_request_failure);
2100
2101void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
2102{
2103 sense_reason_t ret;
2104
2105 if (!cmd->execute_cmd) {
2106 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2107 goto err;
2108 }
2109 if (do_checks) {
2110
2111
2112
2113
2114
2115
2116 ret = target_scsi3_ua_check(cmd);
2117 if (ret)
2118 goto err;
2119
2120 ret = target_alua_state_check(cmd);
2121 if (ret)
2122 goto err;
2123
2124 ret = target_check_reservation(cmd);
2125 if (ret) {
2126 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2127 goto err;
2128 }
2129 }
2130
2131 ret = cmd->execute_cmd(cmd);
2132 if (!ret)
2133 return;
2134err:
2135 spin_lock_irq(&cmd->t_state_lock);
2136 cmd->transport_state &= ~CMD_T_SENT;
2137 spin_unlock_irq(&cmd->t_state_lock);
2138
2139 transport_generic_request_failure(cmd, ret);
2140}
2141
2142static int target_write_prot_action(struct se_cmd *cmd)
2143{
2144 u32 sectors;
2145
2146
2147
2148
2149
2150 switch (cmd->prot_op) {
2151 case TARGET_PROT_DOUT_INSERT:
2152 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
2153 sbc_dif_generate(cmd);
2154 break;
2155 case TARGET_PROT_DOUT_STRIP:
2156 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
2157 break;
2158
2159 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
2160 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2161 sectors, 0, cmd->t_prot_sg, 0);
2162 if (unlikely(cmd->pi_err)) {
2163 spin_lock_irq(&cmd->t_state_lock);
2164 cmd->transport_state &= ~CMD_T_SENT;
2165 spin_unlock_irq(&cmd->t_state_lock);
2166 transport_generic_request_failure(cmd, cmd->pi_err);
2167 return -1;
2168 }
2169 break;
2170 default:
2171 break;
2172 }
2173
2174 return 0;
2175}
2176
2177static bool target_handle_task_attr(struct se_cmd *cmd)
2178{
2179 struct se_device *dev = cmd->se_dev;
2180
2181 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
2182 return false;
2183
2184 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
2185
2186
2187
2188
2189
2190 switch (cmd->sam_task_attr) {
2191 case TCM_HEAD_TAG:
2192 atomic_inc_mb(&dev->non_ordered);
2193 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
2194 cmd->t_task_cdb[0]);
2195 return false;
2196 case TCM_ORDERED_TAG:
2197 atomic_inc_mb(&dev->delayed_cmd_count);
2198
2199 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
2200 cmd->t_task_cdb[0]);
2201 break;
2202 default:
2203
2204
2205
2206 atomic_inc_mb(&dev->non_ordered);
2207
2208 if (atomic_read(&dev->delayed_cmd_count) == 0)
2209 return false;
2210 break;
2211 }
2212
2213 if (cmd->sam_task_attr != TCM_ORDERED_TAG) {
2214 atomic_inc_mb(&dev->delayed_cmd_count);
2215
2216
2217
2218
2219 atomic_dec_mb(&dev->non_ordered);
2220 }
2221
2222 spin_lock_irq(&cmd->t_state_lock);
2223 cmd->transport_state &= ~CMD_T_SENT;
2224 spin_unlock_irq(&cmd->t_state_lock);
2225
2226 spin_lock(&dev->delayed_cmd_lock);
2227 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
2228 spin_unlock(&dev->delayed_cmd_lock);
2229
2230 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
2231 cmd->t_task_cdb[0], cmd->sam_task_attr);
2232
2233
2234
2235
2236
2237 schedule_work(&dev->delayed_cmd_work);
2238 return true;
2239}
2240
2241void target_execute_cmd(struct se_cmd *cmd)
2242{
2243
2244
2245
2246
2247
2248
2249 if (target_cmd_interrupted(cmd))
2250 return;
2251
2252 spin_lock_irq(&cmd->t_state_lock);
2253 cmd->t_state = TRANSPORT_PROCESSING;
2254 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
2255 spin_unlock_irq(&cmd->t_state_lock);
2256
2257 if (target_write_prot_action(cmd))
2258 return;
2259
2260 if (target_handle_task_attr(cmd))
2261 return;
2262
2263 __target_execute_cmd(cmd, true);
2264}
2265EXPORT_SYMBOL(target_execute_cmd);
2266
2267
2268
2269
2270
2271void target_do_delayed_work(struct work_struct *work)
2272{
2273 struct se_device *dev = container_of(work, struct se_device,
2274 delayed_cmd_work);
2275
2276 spin_lock(&dev->delayed_cmd_lock);
2277 while (!dev->ordered_sync_in_progress) {
2278 struct se_cmd *cmd;
2279
2280 if (list_empty(&dev->delayed_cmd_list))
2281 break;
2282
2283 cmd = list_entry(dev->delayed_cmd_list.next,
2284 struct se_cmd, se_delayed_node);
2285
2286 if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
2287
2288
2289
2290
2291
2292
2293 if (atomic_read(&dev->non_ordered) > 0)
2294 break;
2295
2296 dev->ordered_sync_in_progress = true;
2297 }
2298
2299 list_del(&cmd->se_delayed_node);
2300 atomic_dec_mb(&dev->delayed_cmd_count);
2301 spin_unlock(&dev->delayed_cmd_lock);
2302
2303 if (cmd->sam_task_attr != TCM_ORDERED_TAG)
2304 atomic_inc_mb(&dev->non_ordered);
2305
2306 cmd->transport_state |= CMD_T_SENT;
2307
2308 __target_execute_cmd(cmd, true);
2309
2310 spin_lock(&dev->delayed_cmd_lock);
2311 }
2312 spin_unlock(&dev->delayed_cmd_lock);
2313}
2314
2315
2316
2317
2318
2319static void transport_complete_task_attr(struct se_cmd *cmd)
2320{
2321 struct se_device *dev = cmd->se_dev;
2322
2323 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
2324 return;
2325
2326 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
2327 goto restart;
2328
2329 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
2330 atomic_dec_mb(&dev->non_ordered);
2331 dev->dev_cur_ordered_id++;
2332 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
2333 atomic_dec_mb(&dev->non_ordered);
2334 dev->dev_cur_ordered_id++;
2335 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
2336 dev->dev_cur_ordered_id);
2337 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
2338 spin_lock(&dev->delayed_cmd_lock);
2339 dev->ordered_sync_in_progress = false;
2340 spin_unlock(&dev->delayed_cmd_lock);
2341
2342 dev->dev_cur_ordered_id++;
2343 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
2344 dev->dev_cur_ordered_id);
2345 }
2346 cmd->se_cmd_flags &= ~SCF_TASK_ATTR_SET;
2347
2348restart:
2349 if (atomic_read(&dev->delayed_cmd_count) > 0)
2350 schedule_work(&dev->delayed_cmd_work);
2351}
2352
2353static void transport_complete_qf(struct se_cmd *cmd)
2354{
2355 int ret = 0;
2356
2357 transport_complete_task_attr(cmd);
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367 if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) {
2368 if (cmd->scsi_status)
2369 goto queue_status;
2370
2371 translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
2372 goto queue_status;
2373 }
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384 if (!(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) &&
2385 cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
2386 goto queue_status;
2387
2388 switch (cmd->data_direction) {
2389 case DMA_FROM_DEVICE:
2390
2391 if (cmd->scsi_status &&
2392 !(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL))
2393 goto queue_status;
2394
2395 trace_target_cmd_complete(cmd);
2396 ret = cmd->se_tfo->queue_data_in(cmd);
2397 break;
2398 case DMA_TO_DEVICE:
2399 if (cmd->se_cmd_flags & SCF_BIDI) {
2400 ret = cmd->se_tfo->queue_data_in(cmd);
2401 break;
2402 }
2403 fallthrough;
2404 case DMA_NONE:
2405queue_status:
2406 trace_target_cmd_complete(cmd);
2407 ret = cmd->se_tfo->queue_status(cmd);
2408 break;
2409 default:
2410 break;
2411 }
2412
2413 if (ret < 0) {
2414 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
2415 return;
2416 }
2417 transport_lun_remove_cmd(cmd);
2418 transport_cmd_check_stop_to_fabric(cmd);
2419}
2420
2421static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev,
2422 int err, bool write_pending)
2423{
2424
2425
2426
2427
2428
2429
2430
2431
2432 if (err == -EAGAIN || err == -ENOMEM) {
2433 cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP :
2434 TRANSPORT_COMPLETE_QF_OK;
2435 } else {
2436 pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err);
2437 cmd->t_state = TRANSPORT_COMPLETE_QF_ERR;
2438 }
2439
2440 spin_lock_irq(&dev->qf_cmd_lock);
2441 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2442 atomic_inc_mb(&dev->dev_qf_count);
2443 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2444
2445 schedule_work(&cmd->se_dev->qf_work_queue);
2446}
2447
2448static bool target_read_prot_action(struct se_cmd *cmd)
2449{
2450 switch (cmd->prot_op) {
2451 case TARGET_PROT_DIN_STRIP:
2452 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
2453 u32 sectors = cmd->data_length >>
2454 ilog2(cmd->se_dev->dev_attrib.block_size);
2455
2456 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2457 sectors, 0, cmd->t_prot_sg,
2458 0);
2459 if (cmd->pi_err)
2460 return true;
2461 }
2462 break;
2463 case TARGET_PROT_DIN_INSERT:
2464 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2465 break;
2466
2467 sbc_dif_generate(cmd);
2468 break;
2469 default:
2470 break;
2471 }
2472
2473 return false;
2474}
2475
2476static void target_complete_ok_work(struct work_struct *work)
2477{
2478 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2479 int ret;
2480
2481
2482
2483
2484
2485
2486 transport_complete_task_attr(cmd);
2487
2488
2489
2490
2491
2492 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2493 schedule_work(&cmd->se_dev->qf_work_queue);
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504 if (!(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) &&
2505 cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2506 WARN_ON(!cmd->scsi_status);
2507 ret = transport_send_check_condition_and_sense(
2508 cmd, 0, 1);
2509 if (ret)
2510 goto queue_full;
2511
2512 transport_lun_remove_cmd(cmd);
2513 transport_cmd_check_stop_to_fabric(cmd);
2514 return;
2515 }
2516
2517
2518
2519
2520 if (cmd->transport_complete_callback) {
2521 sense_reason_t rc;
2522 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2523 bool zero_dl = !(cmd->data_length);
2524 int post_ret = 0;
2525
2526 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2527 if (!rc && !post_ret) {
2528 if (caw && zero_dl)
2529 goto queue_rsp;
2530
2531 return;
2532 } else if (rc) {
2533 ret = transport_send_check_condition_and_sense(cmd,
2534 rc, 0);
2535 if (ret)
2536 goto queue_full;
2537
2538 transport_lun_remove_cmd(cmd);
2539 transport_cmd_check_stop_to_fabric(cmd);
2540 return;
2541 }
2542 }
2543
2544queue_rsp:
2545 switch (cmd->data_direction) {
2546 case DMA_FROM_DEVICE:
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557 if (cmd->scsi_status &&
2558 !(cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL))
2559 goto queue_status;
2560
2561 atomic_long_add(cmd->data_length,
2562 &cmd->se_lun->lun_stats.tx_data_octets);
2563
2564
2565
2566
2567
2568 if (target_read_prot_action(cmd)) {
2569 ret = transport_send_check_condition_and_sense(cmd,
2570 cmd->pi_err, 0);
2571 if (ret)
2572 goto queue_full;
2573
2574 transport_lun_remove_cmd(cmd);
2575 transport_cmd_check_stop_to_fabric(cmd);
2576 return;
2577 }
2578
2579 trace_target_cmd_complete(cmd);
2580 ret = cmd->se_tfo->queue_data_in(cmd);
2581 if (ret)
2582 goto queue_full;
2583 break;
2584 case DMA_TO_DEVICE:
2585 atomic_long_add(cmd->data_length,
2586 &cmd->se_lun->lun_stats.rx_data_octets);
2587
2588
2589
2590 if (cmd->se_cmd_flags & SCF_BIDI) {
2591 atomic_long_add(cmd->data_length,
2592 &cmd->se_lun->lun_stats.tx_data_octets);
2593 ret = cmd->se_tfo->queue_data_in(cmd);
2594 if (ret)
2595 goto queue_full;
2596 break;
2597 }
2598 fallthrough;
2599 case DMA_NONE:
2600queue_status:
2601 trace_target_cmd_complete(cmd);
2602 ret = cmd->se_tfo->queue_status(cmd);
2603 if (ret)
2604 goto queue_full;
2605 break;
2606 default:
2607 break;
2608 }
2609
2610 transport_lun_remove_cmd(cmd);
2611 transport_cmd_check_stop_to_fabric(cmd);
2612 return;
2613
2614queue_full:
2615 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2616 " data_direction: %d\n", cmd, cmd->data_direction);
2617
2618 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
2619}
2620
2621void target_free_sgl(struct scatterlist *sgl, int nents)
2622{
2623 sgl_free_n_order(sgl, nents, 0);
2624}
2625EXPORT_SYMBOL(target_free_sgl);
2626
2627static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2628{
2629
2630
2631
2632
2633 if (!cmd->t_data_sg_orig)
2634 return;
2635
2636 kfree(cmd->t_data_sg);
2637 cmd->t_data_sg = cmd->t_data_sg_orig;
2638 cmd->t_data_sg_orig = NULL;
2639 cmd->t_data_nents = cmd->t_data_nents_orig;
2640 cmd->t_data_nents_orig = 0;
2641}
2642
2643static inline void transport_free_pages(struct se_cmd *cmd)
2644{
2645 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2646 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2647 cmd->t_prot_sg = NULL;
2648 cmd->t_prot_nents = 0;
2649 }
2650
2651 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2652
2653
2654
2655
2656 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2657 target_free_sgl(cmd->t_bidi_data_sg,
2658 cmd->t_bidi_data_nents);
2659 cmd->t_bidi_data_sg = NULL;
2660 cmd->t_bidi_data_nents = 0;
2661 }
2662 transport_reset_sgl_orig(cmd);
2663 return;
2664 }
2665 transport_reset_sgl_orig(cmd);
2666
2667 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2668 cmd->t_data_sg = NULL;
2669 cmd->t_data_nents = 0;
2670
2671 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2672 cmd->t_bidi_data_sg = NULL;
2673 cmd->t_bidi_data_nents = 0;
2674}
2675
2676void *transport_kmap_data_sg(struct se_cmd *cmd)
2677{
2678 struct scatterlist *sg = cmd->t_data_sg;
2679 struct page **pages;
2680 int i;
2681
2682
2683
2684
2685
2686
2687 if (!cmd->t_data_nents)
2688 return NULL;
2689
2690 BUG_ON(!sg);
2691 if (cmd->t_data_nents == 1)
2692 return kmap(sg_page(sg)) + sg->offset;
2693
2694
2695 pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL);
2696 if (!pages)
2697 return NULL;
2698
2699
2700 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2701 pages[i] = sg_page(sg);
2702 }
2703
2704 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2705 kfree(pages);
2706 if (!cmd->t_data_vmap)
2707 return NULL;
2708
2709 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2710}
2711EXPORT_SYMBOL(transport_kmap_data_sg);
2712
2713void transport_kunmap_data_sg(struct se_cmd *cmd)
2714{
2715 if (!cmd->t_data_nents) {
2716 return;
2717 } else if (cmd->t_data_nents == 1) {
2718 kunmap(sg_page(cmd->t_data_sg));
2719 return;
2720 }
2721
2722 vunmap(cmd->t_data_vmap);
2723 cmd->t_data_vmap = NULL;
2724}
2725EXPORT_SYMBOL(transport_kunmap_data_sg);
2726
2727int
2728target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2729 bool zero_page, bool chainable)
2730{
2731 gfp_t gfp = GFP_KERNEL | (zero_page ? __GFP_ZERO : 0);
2732
2733 *sgl = sgl_alloc_order(length, 0, chainable, gfp, nents);
2734 return *sgl ? 0 : -ENOMEM;
2735}
2736EXPORT_SYMBOL(target_alloc_sgl);
2737
2738
2739
2740
2741
2742
2743sense_reason_t
2744transport_generic_new_cmd(struct se_cmd *cmd)
2745{
2746 unsigned long flags;
2747 int ret = 0;
2748 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2749
2750 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2751 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2752 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2753 cmd->prot_length, true, false);
2754 if (ret < 0)
2755 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2756 }
2757
2758
2759
2760
2761
2762
2763 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2764 cmd->data_length) {
2765
2766 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2767 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2768 u32 bidi_length;
2769
2770 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2771 bidi_length = cmd->t_task_nolb *
2772 cmd->se_dev->dev_attrib.block_size;
2773 else
2774 bidi_length = cmd->data_length;
2775
2776 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2777 &cmd->t_bidi_data_nents,
2778 bidi_length, zero_flag, false);
2779 if (ret < 0)
2780 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2781 }
2782
2783 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2784 cmd->data_length, zero_flag, false);
2785 if (ret < 0)
2786 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2787 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2788 cmd->data_length) {
2789
2790
2791
2792
2793 u32 caw_length = cmd->t_task_nolb *
2794 cmd->se_dev->dev_attrib.block_size;
2795
2796 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2797 &cmd->t_bidi_data_nents,
2798 caw_length, zero_flag, false);
2799 if (ret < 0)
2800 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2801 }
2802
2803
2804
2805
2806
2807 target_add_to_state_list(cmd);
2808 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
2809 target_execute_cmd(cmd);
2810 return 0;
2811 }
2812
2813 spin_lock_irqsave(&cmd->t_state_lock, flags);
2814 cmd->t_state = TRANSPORT_WRITE_PENDING;
2815
2816
2817
2818
2819 if (cmd->transport_state & CMD_T_STOP &&
2820 !cmd->se_tfo->write_pending_must_be_called) {
2821 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
2822 __func__, __LINE__, cmd->tag);
2823
2824 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2825
2826 complete_all(&cmd->t_transport_stop_comp);
2827 return 0;
2828 }
2829 cmd->transport_state &= ~CMD_T_ACTIVE;
2830 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2831
2832 ret = cmd->se_tfo->write_pending(cmd);
2833 if (ret)
2834 goto queue_full;
2835
2836 return 0;
2837
2838queue_full:
2839 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2840 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
2841 return 0;
2842}
2843EXPORT_SYMBOL(transport_generic_new_cmd);
2844
2845static void transport_write_pending_qf(struct se_cmd *cmd)
2846{
2847 unsigned long flags;
2848 int ret;
2849 bool stop;
2850
2851 spin_lock_irqsave(&cmd->t_state_lock, flags);
2852 stop = (cmd->transport_state & (CMD_T_STOP | CMD_T_ABORTED));
2853 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2854
2855 if (stop) {
2856 pr_debug("%s:%d CMD_T_STOP|CMD_T_ABORTED for ITT: 0x%08llx\n",
2857 __func__, __LINE__, cmd->tag);
2858 complete_all(&cmd->t_transport_stop_comp);
2859 return;
2860 }
2861
2862 ret = cmd->se_tfo->write_pending(cmd);
2863 if (ret) {
2864 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2865 cmd);
2866 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
2867 }
2868}
2869
2870static bool
2871__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2872 unsigned long *flags);
2873
2874static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2875{
2876 unsigned long flags;
2877
2878 spin_lock_irqsave(&cmd->t_state_lock, flags);
2879 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2880 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2881}
2882
2883
2884
2885
2886
2887void target_put_cmd_and_wait(struct se_cmd *cmd)
2888{
2889 DECLARE_COMPLETION_ONSTACK(compl);
2890
2891 WARN_ON_ONCE(cmd->abrt_compl);
2892 cmd->abrt_compl = &compl;
2893 target_put_sess_cmd(cmd);
2894 wait_for_completion(&compl);
2895}
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2921{
2922 DECLARE_COMPLETION_ONSTACK(compl);
2923 int ret = 0;
2924 bool aborted = false, tas = false;
2925
2926 if (wait_for_tasks)
2927 target_wait_free_cmd(cmd, &aborted, &tas);
2928
2929 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) {
2930
2931
2932
2933
2934
2935 if (cmd->state_active)
2936 target_remove_from_state_list(cmd);
2937
2938 if (cmd->se_lun)
2939 transport_lun_remove_cmd(cmd);
2940 }
2941 if (aborted)
2942 cmd->free_compl = &compl;
2943 ret = target_put_sess_cmd(cmd);
2944 if (aborted) {
2945 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2946 wait_for_completion(&compl);
2947 ret = 1;
2948 }
2949 return ret;
2950}
2951EXPORT_SYMBOL(transport_generic_free_cmd);
2952
2953
2954
2955
2956
2957
2958int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
2959{
2960 struct se_session *se_sess = se_cmd->se_sess;
2961 int ret = 0;
2962
2963
2964
2965
2966
2967
2968 if (ack_kref) {
2969 kref_get(&se_cmd->cmd_kref);
2970 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2971 }
2972
2973 if (!percpu_ref_tryget_live(&se_sess->cmd_count))
2974 ret = -ESHUTDOWN;
2975
2976 if (ret && ack_kref)
2977 target_put_sess_cmd(se_cmd);
2978
2979 return ret;
2980}
2981EXPORT_SYMBOL(target_get_sess_cmd);
2982
2983static void target_free_cmd_mem(struct se_cmd *cmd)
2984{
2985 transport_free_pages(cmd);
2986
2987 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2988 core_tmr_release_req(cmd->se_tmr_req);
2989 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2990 kfree(cmd->t_task_cdb);
2991}
2992
2993static void target_release_cmd_kref(struct kref *kref)
2994{
2995 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2996 struct se_session *se_sess = se_cmd->se_sess;
2997 struct completion *free_compl = se_cmd->free_compl;
2998 struct completion *abrt_compl = se_cmd->abrt_compl;
2999
3000 target_free_cmd_mem(se_cmd);
3001 se_cmd->se_tfo->release_cmd(se_cmd);
3002 if (free_compl)
3003 complete(free_compl);
3004 if (abrt_compl)
3005 complete(abrt_compl);
3006
3007 percpu_ref_put(&se_sess->cmd_count);
3008}
3009
3010
3011
3012
3013
3014
3015
3016
3017int target_put_sess_cmd(struct se_cmd *se_cmd)
3018{
3019 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
3020}
3021EXPORT_SYMBOL(target_put_sess_cmd);
3022
3023static const char *data_dir_name(enum dma_data_direction d)
3024{
3025 switch (d) {
3026 case DMA_BIDIRECTIONAL: return "BIDI";
3027 case DMA_TO_DEVICE: return "WRITE";
3028 case DMA_FROM_DEVICE: return "READ";
3029 case DMA_NONE: return "NONE";
3030 }
3031
3032 return "(?)";
3033}
3034
3035static const char *cmd_state_name(enum transport_state_table t)
3036{
3037 switch (t) {
3038 case TRANSPORT_NO_STATE: return "NO_STATE";
3039 case TRANSPORT_NEW_CMD: return "NEW_CMD";
3040 case TRANSPORT_WRITE_PENDING: return "WRITE_PENDING";
3041 case TRANSPORT_PROCESSING: return "PROCESSING";
3042 case TRANSPORT_COMPLETE: return "COMPLETE";
3043 case TRANSPORT_ISTATE_PROCESSING:
3044 return "ISTATE_PROCESSING";
3045 case TRANSPORT_COMPLETE_QF_WP: return "COMPLETE_QF_WP";
3046 case TRANSPORT_COMPLETE_QF_OK: return "COMPLETE_QF_OK";
3047 case TRANSPORT_COMPLETE_QF_ERR: return "COMPLETE_QF_ERR";
3048 }
3049
3050 return "(?)";
3051}
3052
3053static void target_append_str(char **str, const char *txt)
3054{
3055 char *prev = *str;
3056
3057 *str = *str ? kasprintf(GFP_ATOMIC, "%s,%s", *str, txt) :
3058 kstrdup(txt, GFP_ATOMIC);
3059 kfree(prev);
3060}
3061
3062
3063
3064
3065
3066static char *target_ts_to_str(u32 ts)
3067{
3068 char *str = NULL;
3069
3070 if (ts & CMD_T_ABORTED)
3071 target_append_str(&str, "aborted");
3072 if (ts & CMD_T_ACTIVE)
3073 target_append_str(&str, "active");
3074 if (ts & CMD_T_COMPLETE)
3075 target_append_str(&str, "complete");
3076 if (ts & CMD_T_SENT)
3077 target_append_str(&str, "sent");
3078 if (ts & CMD_T_STOP)
3079 target_append_str(&str, "stop");
3080 if (ts & CMD_T_FABRIC_STOP)
3081 target_append_str(&str, "fabric_stop");
3082
3083 return str;
3084}
3085
3086static const char *target_tmf_name(enum tcm_tmreq_table tmf)
3087{
3088 switch (tmf) {
3089 case TMR_ABORT_TASK: return "ABORT_TASK";
3090 case TMR_ABORT_TASK_SET: return "ABORT_TASK_SET";
3091 case TMR_CLEAR_ACA: return "CLEAR_ACA";
3092 case TMR_CLEAR_TASK_SET: return "CLEAR_TASK_SET";
3093 case TMR_LUN_RESET: return "LUN_RESET";
3094 case TMR_TARGET_WARM_RESET: return "TARGET_WARM_RESET";
3095 case TMR_TARGET_COLD_RESET: return "TARGET_COLD_RESET";
3096 case TMR_LUN_RESET_PRO: return "LUN_RESET_PRO";
3097 case TMR_UNKNOWN: break;
3098 }
3099 return "(?)";
3100}
3101
3102void target_show_cmd(const char *pfx, struct se_cmd *cmd)
3103{
3104 char *ts_str = target_ts_to_str(cmd->transport_state);
3105 const u8 *cdb = cmd->t_task_cdb;
3106 struct se_tmr_req *tmf = cmd->se_tmr_req;
3107
3108 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3109 pr_debug("%scmd %#02x:%#02x with tag %#llx dir %s i_state %d t_state %s len %d refcnt %d transport_state %s\n",
3110 pfx, cdb[0], cdb[1], cmd->tag,
3111 data_dir_name(cmd->data_direction),
3112 cmd->se_tfo->get_cmd_state(cmd),
3113 cmd_state_name(cmd->t_state), cmd->data_length,
3114 kref_read(&cmd->cmd_kref), ts_str);
3115 } else {
3116 pr_debug("%stmf %s with tag %#llx ref_task_tag %#llx i_state %d t_state %s refcnt %d transport_state %s\n",
3117 pfx, target_tmf_name(tmf->function), cmd->tag,
3118 tmf->ref_task_tag, cmd->se_tfo->get_cmd_state(cmd),
3119 cmd_state_name(cmd->t_state),
3120 kref_read(&cmd->cmd_kref), ts_str);
3121 }
3122 kfree(ts_str);
3123}
3124EXPORT_SYMBOL(target_show_cmd);
3125
3126static void target_stop_session_confirm(struct percpu_ref *ref)
3127{
3128 struct se_session *se_sess = container_of(ref, struct se_session,
3129 cmd_count);
3130 complete_all(&se_sess->stop_done);
3131}
3132
3133
3134
3135
3136
3137void target_stop_session(struct se_session *se_sess)
3138{
3139 pr_debug("Stopping session queue.\n");
3140 if (atomic_cmpxchg(&se_sess->stopped, 0, 1) == 0)
3141 percpu_ref_kill_and_confirm(&se_sess->cmd_count,
3142 target_stop_session_confirm);
3143}
3144EXPORT_SYMBOL(target_stop_session);
3145
3146
3147
3148
3149
3150void target_wait_for_sess_cmds(struct se_session *se_sess)
3151{
3152 int ret;
3153
3154 WARN_ON_ONCE(!atomic_read(&se_sess->stopped));
3155
3156 do {
3157 pr_debug("Waiting for running cmds to complete.\n");
3158 ret = wait_event_timeout(se_sess->cmd_count_wq,
3159 percpu_ref_is_zero(&se_sess->cmd_count),
3160 180 * HZ);
3161 } while (ret <= 0);
3162
3163 wait_for_completion(&se_sess->stop_done);
3164 pr_debug("Waiting for cmds done.\n");
3165}
3166EXPORT_SYMBOL(target_wait_for_sess_cmds);
3167
3168
3169
3170
3171
3172void transport_clear_lun_ref(struct se_lun *lun)
3173{
3174 percpu_ref_kill(&lun->lun_ref);
3175 wait_for_completion(&lun->lun_shutdown_comp);
3176}
3177
3178static bool
3179__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
3180 bool *aborted, bool *tas, unsigned long *flags)
3181 __releases(&cmd->t_state_lock)
3182 __acquires(&cmd->t_state_lock)
3183{
3184 lockdep_assert_held(&cmd->t_state_lock);
3185
3186 if (fabric_stop)
3187 cmd->transport_state |= CMD_T_FABRIC_STOP;
3188
3189 if (cmd->transport_state & CMD_T_ABORTED)
3190 *aborted = true;
3191
3192 if (cmd->transport_state & CMD_T_TAS)
3193 *tas = true;
3194
3195 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
3196 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
3197 return false;
3198
3199 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
3200 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
3201 return false;
3202
3203 if (!(cmd->transport_state & CMD_T_ACTIVE))
3204 return false;
3205
3206 if (fabric_stop && *aborted)
3207 return false;
3208
3209 cmd->transport_state |= CMD_T_STOP;
3210
3211 target_show_cmd("wait_for_tasks: Stopping ", cmd);
3212
3213 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
3214
3215 while (!wait_for_completion_timeout(&cmd->t_transport_stop_comp,
3216 180 * HZ))
3217 target_show_cmd("wait for tasks: ", cmd);
3218
3219 spin_lock_irqsave(&cmd->t_state_lock, *flags);
3220 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
3221
3222 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
3223 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
3224
3225 return true;
3226}
3227
3228
3229
3230
3231
3232bool transport_wait_for_tasks(struct se_cmd *cmd)
3233{
3234 unsigned long flags;
3235 bool ret, aborted = false, tas = false;
3236
3237 spin_lock_irqsave(&cmd->t_state_lock, flags);
3238 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
3239 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3240
3241 return ret;
3242}
3243EXPORT_SYMBOL(transport_wait_for_tasks);
3244
3245struct sense_detail {
3246 u8 key;
3247 u8 asc;
3248 u8 ascq;
3249 bool add_sense_info;
3250};
3251
3252static const struct sense_detail sense_detail_table[] = {
3253 [TCM_NO_SENSE] = {
3254 .key = NOT_READY
3255 },
3256 [TCM_NON_EXISTENT_LUN] = {
3257 .key = ILLEGAL_REQUEST,
3258 .asc = 0x25
3259 },
3260 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
3261 .key = ILLEGAL_REQUEST,
3262 .asc = 0x20,
3263 },
3264 [TCM_SECTOR_COUNT_TOO_MANY] = {
3265 .key = ILLEGAL_REQUEST,
3266 .asc = 0x20,
3267 },
3268 [TCM_UNKNOWN_MODE_PAGE] = {
3269 .key = ILLEGAL_REQUEST,
3270 .asc = 0x24,
3271 },
3272 [TCM_CHECK_CONDITION_ABORT_CMD] = {
3273 .key = ABORTED_COMMAND,
3274 .asc = 0x29,
3275 .ascq = 0x03,
3276 },
3277 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
3278 .key = ABORTED_COMMAND,
3279 .asc = 0x0c,
3280 .ascq = 0x0d,
3281 },
3282 [TCM_INVALID_CDB_FIELD] = {
3283 .key = ILLEGAL_REQUEST,
3284 .asc = 0x24,
3285 },
3286 [TCM_INVALID_PARAMETER_LIST] = {
3287 .key = ILLEGAL_REQUEST,
3288 .asc = 0x26,
3289 },
3290 [TCM_TOO_MANY_TARGET_DESCS] = {
3291 .key = ILLEGAL_REQUEST,
3292 .asc = 0x26,
3293 .ascq = 0x06,
3294 },
3295 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = {
3296 .key = ILLEGAL_REQUEST,
3297 .asc = 0x26,
3298 .ascq = 0x07,
3299 },
3300 [TCM_TOO_MANY_SEGMENT_DESCS] = {
3301 .key = ILLEGAL_REQUEST,
3302 .asc = 0x26,
3303 .ascq = 0x08,
3304 },
3305 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = {
3306 .key = ILLEGAL_REQUEST,
3307 .asc = 0x26,
3308 .ascq = 0x09,
3309 },
3310 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
3311 .key = ILLEGAL_REQUEST,
3312 .asc = 0x1a,
3313 },
3314 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
3315 .key = ILLEGAL_REQUEST,
3316 .asc = 0x0c,
3317 .ascq = 0x0c,
3318 },
3319 [TCM_SERVICE_CRC_ERROR] = {
3320 .key = ABORTED_COMMAND,
3321 .asc = 0x47,
3322 .ascq = 0x05,
3323 },
3324 [TCM_SNACK_REJECTED] = {
3325 .key = ABORTED_COMMAND,
3326 .asc = 0x11,
3327 .ascq = 0x13,
3328 },
3329 [TCM_WRITE_PROTECTED] = {
3330 .key = DATA_PROTECT,
3331 .asc = 0x27,
3332 },
3333 [TCM_ADDRESS_OUT_OF_RANGE] = {
3334 .key = ILLEGAL_REQUEST,
3335 .asc = 0x21,
3336 },
3337 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
3338 .key = UNIT_ATTENTION,
3339 },
3340 [TCM_MISCOMPARE_VERIFY] = {
3341 .key = MISCOMPARE,
3342 .asc = 0x1d,
3343 .ascq = 0x00,
3344 .add_sense_info = true,
3345 },
3346 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
3347 .key = ABORTED_COMMAND,
3348 .asc = 0x10,
3349 .ascq = 0x01,
3350 .add_sense_info = true,
3351 },
3352 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
3353 .key = ABORTED_COMMAND,
3354 .asc = 0x10,
3355 .ascq = 0x02,
3356 .add_sense_info = true,
3357 },
3358 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
3359 .key = ABORTED_COMMAND,
3360 .asc = 0x10,
3361 .ascq = 0x03,
3362 .add_sense_info = true,
3363 },
3364 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
3365 .key = COPY_ABORTED,
3366 .asc = 0x0d,
3367 .ascq = 0x02,
3368
3369 },
3370 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
3371
3372
3373
3374
3375
3376
3377 .key = NOT_READY,
3378 .asc = 0x08,
3379 },
3380 [TCM_INSUFFICIENT_REGISTRATION_RESOURCES] = {
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391 .key = ILLEGAL_REQUEST,
3392 .asc = 0x55,
3393 .ascq = 0x04,
3394 },
3395 [TCM_INVALID_FIELD_IN_COMMAND_IU] = {
3396 .key = ILLEGAL_REQUEST,
3397 .asc = 0x0e,
3398 .ascq = 0x03,
3399 },
3400 [TCM_ALUA_TG_PT_STANDBY] = {
3401 .key = NOT_READY,
3402 .asc = 0x04,
3403 .ascq = ASCQ_04H_ALUA_TG_PT_STANDBY,
3404 },
3405 [TCM_ALUA_TG_PT_UNAVAILABLE] = {
3406 .key = NOT_READY,
3407 .asc = 0x04,
3408 .ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE,
3409 },
3410 [TCM_ALUA_STATE_TRANSITION] = {
3411 .key = NOT_READY,
3412 .asc = 0x04,
3413 .ascq = ASCQ_04H_ALUA_STATE_TRANSITION,
3414 },
3415 [TCM_ALUA_OFFLINE] = {
3416 .key = NOT_READY,
3417 .asc = 0x04,
3418 .ascq = ASCQ_04H_ALUA_OFFLINE,
3419 },
3420};
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433static void translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
3434{
3435 const struct sense_detail *sd;
3436 u8 *buffer = cmd->sense_buffer;
3437 int r = (__force int)reason;
3438 u8 key, asc, ascq;
3439 bool desc_format = target_sense_desc_format(cmd->se_dev);
3440
3441 if (r < ARRAY_SIZE(sense_detail_table) && sense_detail_table[r].key)
3442 sd = &sense_detail_table[r];
3443 else
3444 sd = &sense_detail_table[(__force int)
3445 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
3446
3447 key = sd->key;
3448 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
3449 if (!core_scsi3_ua_for_check_condition(cmd, &key, &asc,
3450 &ascq)) {
3451 cmd->scsi_status = SAM_STAT_BUSY;
3452 return;
3453 }
3454 } else {
3455 WARN_ON_ONCE(sd->asc == 0);
3456 asc = sd->asc;
3457 ascq = sd->ascq;
3458 }
3459
3460 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
3461 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3462 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
3463 scsi_build_sense_buffer(desc_format, buffer, key, asc, ascq);
3464 if (sd->add_sense_info)
3465 WARN_ON_ONCE(scsi_set_sense_information(buffer,
3466 cmd->scsi_sense_length,
3467 cmd->sense_info) < 0);
3468}
3469
3470int
3471transport_send_check_condition_and_sense(struct se_cmd *cmd,
3472 sense_reason_t reason, int from_transport)
3473{
3474 unsigned long flags;
3475
3476 WARN_ON_ONCE(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB);
3477
3478 spin_lock_irqsave(&cmd->t_state_lock, flags);
3479 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3480 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3481 return 0;
3482 }
3483 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
3484 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3485
3486 if (!from_transport)
3487 translate_sense_reason(cmd, reason);
3488
3489 trace_target_cmd_complete(cmd);
3490 return cmd->se_tfo->queue_status(cmd);
3491}
3492EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3493
3494
3495
3496
3497
3498
3499
3500int target_send_busy(struct se_cmd *cmd)
3501{
3502 WARN_ON_ONCE(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB);
3503
3504 cmd->scsi_status = SAM_STAT_BUSY;
3505 trace_target_cmd_complete(cmd);
3506 return cmd->se_tfo->queue_status(cmd);
3507}
3508EXPORT_SYMBOL(target_send_busy);
3509
3510static void target_tmr_work(struct work_struct *work)
3511{
3512 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3513 struct se_device *dev = cmd->se_dev;
3514 struct se_tmr_req *tmr = cmd->se_tmr_req;
3515 int ret;
3516
3517 if (cmd->transport_state & CMD_T_ABORTED)
3518 goto aborted;
3519
3520 switch (tmr->function) {
3521 case TMR_ABORT_TASK:
3522 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3523 break;
3524 case TMR_ABORT_TASK_SET:
3525 case TMR_CLEAR_ACA:
3526 case TMR_CLEAR_TASK_SET:
3527 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3528 break;
3529 case TMR_LUN_RESET:
3530 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3531 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3532 TMR_FUNCTION_REJECTED;
3533 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3534 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3535 cmd->orig_fe_lun, 0x29,
3536 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3537 }
3538 break;
3539 case TMR_TARGET_WARM_RESET:
3540 tmr->response = TMR_FUNCTION_REJECTED;
3541 break;
3542 case TMR_TARGET_COLD_RESET:
3543 tmr->response = TMR_FUNCTION_REJECTED;
3544 break;
3545 default:
3546 pr_err("Unknown TMR function: 0x%02x.\n",
3547 tmr->function);
3548 tmr->response = TMR_FUNCTION_REJECTED;
3549 break;
3550 }
3551
3552 if (cmd->transport_state & CMD_T_ABORTED)
3553 goto aborted;
3554
3555 cmd->se_tfo->queue_tm_rsp(cmd);
3556
3557 transport_lun_remove_cmd(cmd);
3558 transport_cmd_check_stop_to_fabric(cmd);
3559 return;
3560
3561aborted:
3562 target_handle_abort(cmd);
3563}
3564
3565int transport_generic_handle_tmr(
3566 struct se_cmd *cmd)
3567{
3568 unsigned long flags;
3569 bool aborted = false;
3570
3571 spin_lock_irqsave(&cmd->t_state_lock, flags);
3572 if (cmd->transport_state & CMD_T_ABORTED) {
3573 aborted = true;
3574 } else {
3575 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3576 cmd->transport_state |= CMD_T_ACTIVE;
3577 }
3578 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3579
3580 if (aborted) {
3581 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d ref_tag: %llu tag: %llu\n",
3582 cmd->se_tmr_req->function,
3583 cmd->se_tmr_req->ref_task_tag, cmd->tag);
3584 target_handle_abort(cmd);
3585 return 0;
3586 }
3587
3588 INIT_WORK(&cmd->work, target_tmr_work);
3589 schedule_work(&cmd->work);
3590 return 0;
3591}
3592EXPORT_SYMBOL(transport_generic_handle_tmr);
3593
3594bool
3595target_check_wce(struct se_device *dev)
3596{
3597 bool wce = false;
3598
3599 if (dev->transport->get_write_cache)
3600 wce = dev->transport->get_write_cache(dev);
3601 else if (dev->dev_attrib.emulate_write_cache > 0)
3602 wce = true;
3603
3604 return wce;
3605}
3606
3607bool
3608target_check_fua(struct se_device *dev)
3609{
3610 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3611}
3612