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Merge tag 'clk-for-linus-3.15' of git://git.linaro.org/people/mike.turquette/linux
[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_transport.c
1 /*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * (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(void)
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
255 return se_sess;
256 }
257 EXPORT_SYMBOL(transport_init_session);
258
259 int transport_alloc_session_tags(struct se_session *se_sess,
260 unsigned int tag_num, unsigned int tag_size)
261 {
262 int rc;
263
264 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
265 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
266 if (!se_sess->sess_cmd_map) {
267 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
268 if (!se_sess->sess_cmd_map) {
269 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
270 return -ENOMEM;
271 }
272 }
273
274 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
275 if (rc < 0) {
276 pr_err("Unable to init se_sess->sess_tag_pool,"
277 " tag_num: %u\n", tag_num);
278 if (is_vmalloc_addr(se_sess->sess_cmd_map))
279 vfree(se_sess->sess_cmd_map);
280 else
281 kfree(se_sess->sess_cmd_map);
282 se_sess->sess_cmd_map = NULL;
283 return -ENOMEM;
284 }
285
286 return 0;
287 }
288 EXPORT_SYMBOL(transport_alloc_session_tags);
289
290 struct se_session *transport_init_session_tags(unsigned int tag_num,
291 unsigned int tag_size)
292 {
293 struct se_session *se_sess;
294 int rc;
295
296 se_sess = transport_init_session();
297 if (IS_ERR(se_sess))
298 return se_sess;
299
300 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
301 if (rc < 0) {
302 transport_free_session(se_sess);
303 return ERR_PTR(-ENOMEM);
304 }
305
306 return se_sess;
307 }
308 EXPORT_SYMBOL(transport_init_session_tags);
309
310 /*
311 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
312 */
313 void __transport_register_session(
314 struct se_portal_group *se_tpg,
315 struct se_node_acl *se_nacl,
316 struct se_session *se_sess,
317 void *fabric_sess_ptr)
318 {
319 unsigned char buf[PR_REG_ISID_LEN];
320
321 se_sess->se_tpg = se_tpg;
322 se_sess->fabric_sess_ptr = fabric_sess_ptr;
323 /*
324 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
325 *
326 * Only set for struct se_session's that will actually be moving I/O.
327 * eg: *NOT* discovery sessions.
328 */
329 if (se_nacl) {
330 /*
331 * If the fabric module supports an ISID based TransportID,
332 * save this value in binary from the fabric I_T Nexus now.
333 */
334 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
335 memset(&buf[0], 0, PR_REG_ISID_LEN);
336 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
337 &buf[0], PR_REG_ISID_LEN);
338 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
339 }
340 kref_get(&se_nacl->acl_kref);
341
342 spin_lock_irq(&se_nacl->nacl_sess_lock);
343 /*
344 * The se_nacl->nacl_sess pointer will be set to the
345 * last active I_T Nexus for each struct se_node_acl.
346 */
347 se_nacl->nacl_sess = se_sess;
348
349 list_add_tail(&se_sess->sess_acl_list,
350 &se_nacl->acl_sess_list);
351 spin_unlock_irq(&se_nacl->nacl_sess_lock);
352 }
353 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
354
355 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
356 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
357 }
358 EXPORT_SYMBOL(__transport_register_session);
359
360 void transport_register_session(
361 struct se_portal_group *se_tpg,
362 struct se_node_acl *se_nacl,
363 struct se_session *se_sess,
364 void *fabric_sess_ptr)
365 {
366 unsigned long flags;
367
368 spin_lock_irqsave(&se_tpg->session_lock, flags);
369 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
370 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
371 }
372 EXPORT_SYMBOL(transport_register_session);
373
374 static void target_release_session(struct kref *kref)
375 {
376 struct se_session *se_sess = container_of(kref,
377 struct se_session, sess_kref);
378 struct se_portal_group *se_tpg = se_sess->se_tpg;
379
380 se_tpg->se_tpg_tfo->close_session(se_sess);
381 }
382
383 void target_get_session(struct se_session *se_sess)
384 {
385 kref_get(&se_sess->sess_kref);
386 }
387 EXPORT_SYMBOL(target_get_session);
388
389 void target_put_session(struct se_session *se_sess)
390 {
391 struct se_portal_group *tpg = se_sess->se_tpg;
392
393 if (tpg->se_tpg_tfo->put_session != NULL) {
394 tpg->se_tpg_tfo->put_session(se_sess);
395 return;
396 }
397 kref_put(&se_sess->sess_kref, target_release_session);
398 }
399 EXPORT_SYMBOL(target_put_session);
400
401 static void target_complete_nacl(struct kref *kref)
402 {
403 struct se_node_acl *nacl = container_of(kref,
404 struct se_node_acl, acl_kref);
405
406 complete(&nacl->acl_free_comp);
407 }
408
409 void target_put_nacl(struct se_node_acl *nacl)
410 {
411 kref_put(&nacl->acl_kref, target_complete_nacl);
412 }
413
414 void transport_deregister_session_configfs(struct se_session *se_sess)
415 {
416 struct se_node_acl *se_nacl;
417 unsigned long flags;
418 /*
419 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
420 */
421 se_nacl = se_sess->se_node_acl;
422 if (se_nacl) {
423 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
424 if (se_nacl->acl_stop == 0)
425 list_del(&se_sess->sess_acl_list);
426 /*
427 * If the session list is empty, then clear the pointer.
428 * Otherwise, set the struct se_session pointer from the tail
429 * element of the per struct se_node_acl active session list.
430 */
431 if (list_empty(&se_nacl->acl_sess_list))
432 se_nacl->nacl_sess = NULL;
433 else {
434 se_nacl->nacl_sess = container_of(
435 se_nacl->acl_sess_list.prev,
436 struct se_session, sess_acl_list);
437 }
438 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
439 }
440 }
441 EXPORT_SYMBOL(transport_deregister_session_configfs);
442
443 void transport_free_session(struct se_session *se_sess)
444 {
445 if (se_sess->sess_cmd_map) {
446 percpu_ida_destroy(&se_sess->sess_tag_pool);
447 if (is_vmalloc_addr(se_sess->sess_cmd_map))
448 vfree(se_sess->sess_cmd_map);
449 else
450 kfree(se_sess->sess_cmd_map);
451 }
452 kmem_cache_free(se_sess_cache, se_sess);
453 }
454 EXPORT_SYMBOL(transport_free_session);
455
456 void transport_deregister_session(struct se_session *se_sess)
457 {
458 struct se_portal_group *se_tpg = se_sess->se_tpg;
459 struct target_core_fabric_ops *se_tfo;
460 struct se_node_acl *se_nacl;
461 unsigned long flags;
462 bool comp_nacl = true;
463
464 if (!se_tpg) {
465 transport_free_session(se_sess);
466 return;
467 }
468 se_tfo = se_tpg->se_tpg_tfo;
469
470 spin_lock_irqsave(&se_tpg->session_lock, flags);
471 list_del(&se_sess->sess_list);
472 se_sess->se_tpg = NULL;
473 se_sess->fabric_sess_ptr = NULL;
474 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
475
476 /*
477 * Determine if we need to do extra work for this initiator node's
478 * struct se_node_acl if it had been previously dynamically generated.
479 */
480 se_nacl = se_sess->se_node_acl;
481
482 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
483 if (se_nacl && se_nacl->dynamic_node_acl) {
484 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
485 list_del(&se_nacl->acl_list);
486 se_tpg->num_node_acls--;
487 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
488 core_tpg_wait_for_nacl_pr_ref(se_nacl);
489 core_free_device_list_for_node(se_nacl, se_tpg);
490 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
491
492 comp_nacl = false;
493 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
494 }
495 }
496 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
497
498 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
499 se_tpg->se_tpg_tfo->get_fabric_name());
500 /*
501 * If last kref is dropping now for an explicit NodeACL, awake sleeping
502 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
503 * removal context.
504 */
505 if (se_nacl && comp_nacl == true)
506 target_put_nacl(se_nacl);
507
508 transport_free_session(se_sess);
509 }
510 EXPORT_SYMBOL(transport_deregister_session);
511
512 /*
513 * Called with cmd->t_state_lock held.
514 */
515 static void target_remove_from_state_list(struct se_cmd *cmd)
516 {
517 struct se_device *dev = cmd->se_dev;
518 unsigned long flags;
519
520 if (!dev)
521 return;
522
523 if (cmd->transport_state & CMD_T_BUSY)
524 return;
525
526 spin_lock_irqsave(&dev->execute_task_lock, flags);
527 if (cmd->state_active) {
528 list_del(&cmd->state_list);
529 cmd->state_active = false;
530 }
531 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
532 }
533
534 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
535 bool write_pending)
536 {
537 unsigned long flags;
538
539 spin_lock_irqsave(&cmd->t_state_lock, flags);
540 if (write_pending)
541 cmd->t_state = TRANSPORT_WRITE_PENDING;
542
543 if (remove_from_lists) {
544 target_remove_from_state_list(cmd);
545
546 /*
547 * Clear struct se_cmd->se_lun before the handoff to FE.
548 */
549 cmd->se_lun = NULL;
550 }
551
552 /*
553 * Determine if frontend context caller is requesting the stopping of
554 * this command for frontend exceptions.
555 */
556 if (cmd->transport_state & CMD_T_STOP) {
557 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
558 __func__, __LINE__,
559 cmd->se_tfo->get_task_tag(cmd));
560
561 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
562
563 complete(&cmd->t_transport_stop_comp);
564 return 1;
565 }
566
567 cmd->transport_state &= ~CMD_T_ACTIVE;
568 if (remove_from_lists) {
569 /*
570 * Some fabric modules like tcm_loop can release
571 * their internally allocated I/O reference now and
572 * struct se_cmd now.
573 *
574 * Fabric modules are expected to return '1' here if the
575 * se_cmd being passed is released at this point,
576 * or zero if not being released.
577 */
578 if (cmd->se_tfo->check_stop_free != NULL) {
579 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
580 return cmd->se_tfo->check_stop_free(cmd);
581 }
582 }
583
584 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
585 return 0;
586 }
587
588 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
589 {
590 return transport_cmd_check_stop(cmd, true, false);
591 }
592
593 static void transport_lun_remove_cmd(struct se_cmd *cmd)
594 {
595 struct se_lun *lun = cmd->se_lun;
596
597 if (!lun)
598 return;
599
600 if (cmpxchg(&cmd->lun_ref_active, true, false))
601 percpu_ref_put(&lun->lun_ref);
602 }
603
604 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
605 {
606 if (transport_cmd_check_stop_to_fabric(cmd))
607 return;
608 if (remove)
609 transport_put_cmd(cmd);
610 }
611
612 static void target_complete_failure_work(struct work_struct *work)
613 {
614 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
615
616 transport_generic_request_failure(cmd,
617 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
618 }
619
620 /*
621 * Used when asking transport to copy Sense Data from the underlying
622 * Linux/SCSI struct scsi_cmnd
623 */
624 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
625 {
626 struct se_device *dev = cmd->se_dev;
627
628 WARN_ON(!cmd->se_lun);
629
630 if (!dev)
631 return NULL;
632
633 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
634 return NULL;
635
636 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
637
638 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
639 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
640 return cmd->sense_buffer;
641 }
642
643 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
644 {
645 struct se_device *dev = cmd->se_dev;
646 int success = scsi_status == GOOD;
647 unsigned long flags;
648
649 cmd->scsi_status = scsi_status;
650
651
652 spin_lock_irqsave(&cmd->t_state_lock, flags);
653 cmd->transport_state &= ~CMD_T_BUSY;
654
655 if (dev && dev->transport->transport_complete) {
656 dev->transport->transport_complete(cmd,
657 cmd->t_data_sg,
658 transport_get_sense_buffer(cmd));
659 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
660 success = 1;
661 }
662
663 /*
664 * See if we are waiting to complete for an exception condition.
665 */
666 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
667 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
668 complete(&cmd->task_stop_comp);
669 return;
670 }
671
672 /*
673 * Check for case where an explicit ABORT_TASK has been received
674 * and transport_wait_for_tasks() will be waiting for completion..
675 */
676 if (cmd->transport_state & CMD_T_ABORTED &&
677 cmd->transport_state & CMD_T_STOP) {
678 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
679 complete(&cmd->t_transport_stop_comp);
680 return;
681 } else if (!success) {
682 INIT_WORK(&cmd->work, target_complete_failure_work);
683 } else {
684 INIT_WORK(&cmd->work, target_complete_ok_work);
685 }
686
687 cmd->t_state = TRANSPORT_COMPLETE;
688 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
689 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
690
691 queue_work(target_completion_wq, &cmd->work);
692 }
693 EXPORT_SYMBOL(target_complete_cmd);
694
695 static void target_add_to_state_list(struct se_cmd *cmd)
696 {
697 struct se_device *dev = cmd->se_dev;
698 unsigned long flags;
699
700 spin_lock_irqsave(&dev->execute_task_lock, flags);
701 if (!cmd->state_active) {
702 list_add_tail(&cmd->state_list, &dev->state_list);
703 cmd->state_active = true;
704 }
705 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
706 }
707
708 /*
709 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
710 */
711 static void transport_write_pending_qf(struct se_cmd *cmd);
712 static void transport_complete_qf(struct se_cmd *cmd);
713
714 void target_qf_do_work(struct work_struct *work)
715 {
716 struct se_device *dev = container_of(work, struct se_device,
717 qf_work_queue);
718 LIST_HEAD(qf_cmd_list);
719 struct se_cmd *cmd, *cmd_tmp;
720
721 spin_lock_irq(&dev->qf_cmd_lock);
722 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
723 spin_unlock_irq(&dev->qf_cmd_lock);
724
725 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
726 list_del(&cmd->se_qf_node);
727 atomic_dec(&dev->dev_qf_count);
728 smp_mb__after_atomic_dec();
729
730 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
731 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
732 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
733 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
734 : "UNKNOWN");
735
736 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
737 transport_write_pending_qf(cmd);
738 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
739 transport_complete_qf(cmd);
740 }
741 }
742
743 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
744 {
745 switch (cmd->data_direction) {
746 case DMA_NONE:
747 return "NONE";
748 case DMA_FROM_DEVICE:
749 return "READ";
750 case DMA_TO_DEVICE:
751 return "WRITE";
752 case DMA_BIDIRECTIONAL:
753 return "BIDI";
754 default:
755 break;
756 }
757
758 return "UNKNOWN";
759 }
760
761 void transport_dump_dev_state(
762 struct se_device *dev,
763 char *b,
764 int *bl)
765 {
766 *bl += sprintf(b + *bl, "Status: ");
767 if (dev->export_count)
768 *bl += sprintf(b + *bl, "ACTIVATED");
769 else
770 *bl += sprintf(b + *bl, "DEACTIVATED");
771
772 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
773 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
774 dev->dev_attrib.block_size,
775 dev->dev_attrib.hw_max_sectors);
776 *bl += sprintf(b + *bl, " ");
777 }
778
779 void transport_dump_vpd_proto_id(
780 struct t10_vpd *vpd,
781 unsigned char *p_buf,
782 int p_buf_len)
783 {
784 unsigned char buf[VPD_TMP_BUF_SIZE];
785 int len;
786
787 memset(buf, 0, VPD_TMP_BUF_SIZE);
788 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
789
790 switch (vpd->protocol_identifier) {
791 case 0x00:
792 sprintf(buf+len, "Fibre Channel\n");
793 break;
794 case 0x10:
795 sprintf(buf+len, "Parallel SCSI\n");
796 break;
797 case 0x20:
798 sprintf(buf+len, "SSA\n");
799 break;
800 case 0x30:
801 sprintf(buf+len, "IEEE 1394\n");
802 break;
803 case 0x40:
804 sprintf(buf+len, "SCSI Remote Direct Memory Access"
805 " Protocol\n");
806 break;
807 case 0x50:
808 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
809 break;
810 case 0x60:
811 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
812 break;
813 case 0x70:
814 sprintf(buf+len, "Automation/Drive Interface Transport"
815 " Protocol\n");
816 break;
817 case 0x80:
818 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
819 break;
820 default:
821 sprintf(buf+len, "Unknown 0x%02x\n",
822 vpd->protocol_identifier);
823 break;
824 }
825
826 if (p_buf)
827 strncpy(p_buf, buf, p_buf_len);
828 else
829 pr_debug("%s", buf);
830 }
831
832 void
833 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
834 {
835 /*
836 * Check if the Protocol Identifier Valid (PIV) bit is set..
837 *
838 * from spc3r23.pdf section 7.5.1
839 */
840 if (page_83[1] & 0x80) {
841 vpd->protocol_identifier = (page_83[0] & 0xf0);
842 vpd->protocol_identifier_set = 1;
843 transport_dump_vpd_proto_id(vpd, NULL, 0);
844 }
845 }
846 EXPORT_SYMBOL(transport_set_vpd_proto_id);
847
848 int transport_dump_vpd_assoc(
849 struct t10_vpd *vpd,
850 unsigned char *p_buf,
851 int p_buf_len)
852 {
853 unsigned char buf[VPD_TMP_BUF_SIZE];
854 int ret = 0;
855 int len;
856
857 memset(buf, 0, VPD_TMP_BUF_SIZE);
858 len = sprintf(buf, "T10 VPD Identifier Association: ");
859
860 switch (vpd->association) {
861 case 0x00:
862 sprintf(buf+len, "addressed logical unit\n");
863 break;
864 case 0x10:
865 sprintf(buf+len, "target port\n");
866 break;
867 case 0x20:
868 sprintf(buf+len, "SCSI target device\n");
869 break;
870 default:
871 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
872 ret = -EINVAL;
873 break;
874 }
875
876 if (p_buf)
877 strncpy(p_buf, buf, p_buf_len);
878 else
879 pr_debug("%s", buf);
880
881 return ret;
882 }
883
884 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
885 {
886 /*
887 * The VPD identification association..
888 *
889 * from spc3r23.pdf Section 7.6.3.1 Table 297
890 */
891 vpd->association = (page_83[1] & 0x30);
892 return transport_dump_vpd_assoc(vpd, NULL, 0);
893 }
894 EXPORT_SYMBOL(transport_set_vpd_assoc);
895
896 int transport_dump_vpd_ident_type(
897 struct t10_vpd *vpd,
898 unsigned char *p_buf,
899 int p_buf_len)
900 {
901 unsigned char buf[VPD_TMP_BUF_SIZE];
902 int ret = 0;
903 int len;
904
905 memset(buf, 0, VPD_TMP_BUF_SIZE);
906 len = sprintf(buf, "T10 VPD Identifier Type: ");
907
908 switch (vpd->device_identifier_type) {
909 case 0x00:
910 sprintf(buf+len, "Vendor specific\n");
911 break;
912 case 0x01:
913 sprintf(buf+len, "T10 Vendor ID based\n");
914 break;
915 case 0x02:
916 sprintf(buf+len, "EUI-64 based\n");
917 break;
918 case 0x03:
919 sprintf(buf+len, "NAA\n");
920 break;
921 case 0x04:
922 sprintf(buf+len, "Relative target port identifier\n");
923 break;
924 case 0x08:
925 sprintf(buf+len, "SCSI name string\n");
926 break;
927 default:
928 sprintf(buf+len, "Unsupported: 0x%02x\n",
929 vpd->device_identifier_type);
930 ret = -EINVAL;
931 break;
932 }
933
934 if (p_buf) {
935 if (p_buf_len < strlen(buf)+1)
936 return -EINVAL;
937 strncpy(p_buf, buf, p_buf_len);
938 } else {
939 pr_debug("%s", buf);
940 }
941
942 return ret;
943 }
944
945 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
946 {
947 /*
948 * The VPD identifier type..
949 *
950 * from spc3r23.pdf Section 7.6.3.1 Table 298
951 */
952 vpd->device_identifier_type = (page_83[1] & 0x0f);
953 return transport_dump_vpd_ident_type(vpd, NULL, 0);
954 }
955 EXPORT_SYMBOL(transport_set_vpd_ident_type);
956
957 int transport_dump_vpd_ident(
958 struct t10_vpd *vpd,
959 unsigned char *p_buf,
960 int p_buf_len)
961 {
962 unsigned char buf[VPD_TMP_BUF_SIZE];
963 int ret = 0;
964
965 memset(buf, 0, VPD_TMP_BUF_SIZE);
966
967 switch (vpd->device_identifier_code_set) {
968 case 0x01: /* Binary */
969 snprintf(buf, sizeof(buf),
970 "T10 VPD Binary Device Identifier: %s\n",
971 &vpd->device_identifier[0]);
972 break;
973 case 0x02: /* ASCII */
974 snprintf(buf, sizeof(buf),
975 "T10 VPD ASCII Device Identifier: %s\n",
976 &vpd->device_identifier[0]);
977 break;
978 case 0x03: /* UTF-8 */
979 snprintf(buf, sizeof(buf),
980 "T10 VPD UTF-8 Device Identifier: %s\n",
981 &vpd->device_identifier[0]);
982 break;
983 default:
984 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
985 " 0x%02x", vpd->device_identifier_code_set);
986 ret = -EINVAL;
987 break;
988 }
989
990 if (p_buf)
991 strncpy(p_buf, buf, p_buf_len);
992 else
993 pr_debug("%s", buf);
994
995 return ret;
996 }
997
998 int
999 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1000 {
1001 static const char hex_str[] = "0123456789abcdef";
1002 int j = 0, i = 4; /* offset to start of the identifier */
1003
1004 /*
1005 * The VPD Code Set (encoding)
1006 *
1007 * from spc3r23.pdf Section 7.6.3.1 Table 296
1008 */
1009 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1010 switch (vpd->device_identifier_code_set) {
1011 case 0x01: /* Binary */
1012 vpd->device_identifier[j++] =
1013 hex_str[vpd->device_identifier_type];
1014 while (i < (4 + page_83[3])) {
1015 vpd->device_identifier[j++] =
1016 hex_str[(page_83[i] & 0xf0) >> 4];
1017 vpd->device_identifier[j++] =
1018 hex_str[page_83[i] & 0x0f];
1019 i++;
1020 }
1021 break;
1022 case 0x02: /* ASCII */
1023 case 0x03: /* UTF-8 */
1024 while (i < (4 + page_83[3]))
1025 vpd->device_identifier[j++] = page_83[i++];
1026 break;
1027 default:
1028 break;
1029 }
1030
1031 return transport_dump_vpd_ident(vpd, NULL, 0);
1032 }
1033 EXPORT_SYMBOL(transport_set_vpd_ident);
1034
1035 sense_reason_t
1036 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1037 {
1038 struct se_device *dev = cmd->se_dev;
1039
1040 if (cmd->unknown_data_length) {
1041 cmd->data_length = size;
1042 } else if (size != cmd->data_length) {
1043 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1044 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1045 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1046 cmd->data_length, size, cmd->t_task_cdb[0]);
1047
1048 if (cmd->data_direction == DMA_TO_DEVICE) {
1049 pr_err("Rejecting underflow/overflow"
1050 " WRITE data\n");
1051 return TCM_INVALID_CDB_FIELD;
1052 }
1053 /*
1054 * Reject READ_* or WRITE_* with overflow/underflow for
1055 * type SCF_SCSI_DATA_CDB.
1056 */
1057 if (dev->dev_attrib.block_size != 512) {
1058 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1059 " CDB on non 512-byte sector setup subsystem"
1060 " plugin: %s\n", dev->transport->name);
1061 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1062 return TCM_INVALID_CDB_FIELD;
1063 }
1064 /*
1065 * For the overflow case keep the existing fabric provided
1066 * ->data_length. Otherwise for the underflow case, reset
1067 * ->data_length to the smaller SCSI expected data transfer
1068 * length.
1069 */
1070 if (size > cmd->data_length) {
1071 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1072 cmd->residual_count = (size - cmd->data_length);
1073 } else {
1074 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1075 cmd->residual_count = (cmd->data_length - size);
1076 cmd->data_length = size;
1077 }
1078 }
1079
1080 return 0;
1081
1082 }
1083
1084 /*
1085 * Used by fabric modules containing a local struct se_cmd within their
1086 * fabric dependent per I/O descriptor.
1087 */
1088 void transport_init_se_cmd(
1089 struct se_cmd *cmd,
1090 struct target_core_fabric_ops *tfo,
1091 struct se_session *se_sess,
1092 u32 data_length,
1093 int data_direction,
1094 int task_attr,
1095 unsigned char *sense_buffer)
1096 {
1097 INIT_LIST_HEAD(&cmd->se_delayed_node);
1098 INIT_LIST_HEAD(&cmd->se_qf_node);
1099 INIT_LIST_HEAD(&cmd->se_cmd_list);
1100 INIT_LIST_HEAD(&cmd->state_list);
1101 init_completion(&cmd->t_transport_stop_comp);
1102 init_completion(&cmd->cmd_wait_comp);
1103 init_completion(&cmd->task_stop_comp);
1104 spin_lock_init(&cmd->t_state_lock);
1105 cmd->transport_state = CMD_T_DEV_ACTIVE;
1106
1107 cmd->se_tfo = tfo;
1108 cmd->se_sess = se_sess;
1109 cmd->data_length = data_length;
1110 cmd->data_direction = data_direction;
1111 cmd->sam_task_attr = task_attr;
1112 cmd->sense_buffer = sense_buffer;
1113
1114 cmd->state_active = false;
1115 }
1116 EXPORT_SYMBOL(transport_init_se_cmd);
1117
1118 static sense_reason_t
1119 transport_check_alloc_task_attr(struct se_cmd *cmd)
1120 {
1121 struct se_device *dev = cmd->se_dev;
1122
1123 /*
1124 * Check if SAM Task Attribute emulation is enabled for this
1125 * struct se_device storage object
1126 */
1127 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1128 return 0;
1129
1130 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1131 pr_debug("SAM Task Attribute ACA"
1132 " emulation is not supported\n");
1133 return TCM_INVALID_CDB_FIELD;
1134 }
1135 /*
1136 * Used to determine when ORDERED commands should go from
1137 * Dormant to Active status.
1138 */
1139 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1140 smp_mb__after_atomic_inc();
1141 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1142 cmd->se_ordered_id, cmd->sam_task_attr,
1143 dev->transport->name);
1144 return 0;
1145 }
1146
1147 sense_reason_t
1148 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1149 {
1150 struct se_device *dev = cmd->se_dev;
1151 sense_reason_t ret;
1152
1153 /*
1154 * Ensure that the received CDB is less than the max (252 + 8) bytes
1155 * for VARIABLE_LENGTH_CMD
1156 */
1157 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1158 pr_err("Received SCSI CDB with command_size: %d that"
1159 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1160 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1161 return TCM_INVALID_CDB_FIELD;
1162 }
1163 /*
1164 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1165 * allocate the additional extended CDB buffer now.. Otherwise
1166 * setup the pointer from __t_task_cdb to t_task_cdb.
1167 */
1168 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1169 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1170 GFP_KERNEL);
1171 if (!cmd->t_task_cdb) {
1172 pr_err("Unable to allocate cmd->t_task_cdb"
1173 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1174 scsi_command_size(cdb),
1175 (unsigned long)sizeof(cmd->__t_task_cdb));
1176 return TCM_OUT_OF_RESOURCES;
1177 }
1178 } else
1179 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1180 /*
1181 * Copy the original CDB into cmd->
1182 */
1183 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1184
1185 trace_target_sequencer_start(cmd);
1186
1187 /*
1188 * Check for an existing UNIT ATTENTION condition
1189 */
1190 ret = target_scsi3_ua_check(cmd);
1191 if (ret)
1192 return ret;
1193
1194 ret = target_alua_state_check(cmd);
1195 if (ret)
1196 return ret;
1197
1198 ret = target_check_reservation(cmd);
1199 if (ret) {
1200 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1201 return ret;
1202 }
1203
1204 ret = dev->transport->parse_cdb(cmd);
1205 if (ret)
1206 return ret;
1207
1208 ret = transport_check_alloc_task_attr(cmd);
1209 if (ret)
1210 return ret;
1211
1212 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1213
1214 spin_lock(&cmd->se_lun->lun_sep_lock);
1215 if (cmd->se_lun->lun_sep)
1216 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1217 spin_unlock(&cmd->se_lun->lun_sep_lock);
1218 return 0;
1219 }
1220 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1221
1222 /*
1223 * Used by fabric module frontends to queue tasks directly.
1224 * Many only be used from process context only
1225 */
1226 int transport_handle_cdb_direct(
1227 struct se_cmd *cmd)
1228 {
1229 sense_reason_t ret;
1230
1231 if (!cmd->se_lun) {
1232 dump_stack();
1233 pr_err("cmd->se_lun is NULL\n");
1234 return -EINVAL;
1235 }
1236 if (in_interrupt()) {
1237 dump_stack();
1238 pr_err("transport_generic_handle_cdb cannot be called"
1239 " from interrupt context\n");
1240 return -EINVAL;
1241 }
1242 /*
1243 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1244 * outstanding descriptors are handled correctly during shutdown via
1245 * transport_wait_for_tasks()
1246 *
1247 * Also, we don't take cmd->t_state_lock here as we only expect
1248 * this to be called for initial descriptor submission.
1249 */
1250 cmd->t_state = TRANSPORT_NEW_CMD;
1251 cmd->transport_state |= CMD_T_ACTIVE;
1252
1253 /*
1254 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1255 * so follow TRANSPORT_NEW_CMD processing thread context usage
1256 * and call transport_generic_request_failure() if necessary..
1257 */
1258 ret = transport_generic_new_cmd(cmd);
1259 if (ret)
1260 transport_generic_request_failure(cmd, ret);
1261 return 0;
1262 }
1263 EXPORT_SYMBOL(transport_handle_cdb_direct);
1264
1265 sense_reason_t
1266 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1267 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1268 {
1269 if (!sgl || !sgl_count)
1270 return 0;
1271
1272 /*
1273 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1274 * scatterlists already have been set to follow what the fabric
1275 * passes for the original expected data transfer length.
1276 */
1277 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1278 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1279 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1280 return TCM_INVALID_CDB_FIELD;
1281 }
1282
1283 cmd->t_data_sg = sgl;
1284 cmd->t_data_nents = sgl_count;
1285
1286 if (sgl_bidi && sgl_bidi_count) {
1287 cmd->t_bidi_data_sg = sgl_bidi;
1288 cmd->t_bidi_data_nents = sgl_bidi_count;
1289 }
1290 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1291 return 0;
1292 }
1293
1294 /*
1295 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1296 * se_cmd + use pre-allocated SGL memory.
1297 *
1298 * @se_cmd: command descriptor to submit
1299 * @se_sess: associated se_sess for endpoint
1300 * @cdb: pointer to SCSI CDB
1301 * @sense: pointer to SCSI sense buffer
1302 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1303 * @data_length: fabric expected data transfer length
1304 * @task_addr: SAM task attribute
1305 * @data_dir: DMA data direction
1306 * @flags: flags for command submission from target_sc_flags_tables
1307 * @sgl: struct scatterlist memory for unidirectional mapping
1308 * @sgl_count: scatterlist count for unidirectional mapping
1309 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1310 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1311 * @sgl_prot: struct scatterlist memory protection information
1312 * @sgl_prot_count: scatterlist count for protection information
1313 *
1314 * Returns non zero to signal active I/O shutdown failure. All other
1315 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1316 * but still return zero here.
1317 *
1318 * This may only be called from process context, and also currently
1319 * assumes internal allocation of fabric payload buffer by target-core.
1320 */
1321 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1322 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1323 u32 data_length, int task_attr, int data_dir, int flags,
1324 struct scatterlist *sgl, u32 sgl_count,
1325 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1326 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1327 {
1328 struct se_portal_group *se_tpg;
1329 sense_reason_t rc;
1330 int ret;
1331
1332 se_tpg = se_sess->se_tpg;
1333 BUG_ON(!se_tpg);
1334 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1335 BUG_ON(in_interrupt());
1336 /*
1337 * Initialize se_cmd for target operation. From this point
1338 * exceptions are handled by sending exception status via
1339 * target_core_fabric_ops->queue_status() callback
1340 */
1341 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1342 data_length, data_dir, task_attr, sense);
1343 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1344 se_cmd->unknown_data_length = 1;
1345 /*
1346 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1347 * se_sess->sess_cmd_list. A second kref_get here is necessary
1348 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1349 * kref_put() to happen during fabric packet acknowledgement.
1350 */
1351 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1352 if (ret)
1353 return ret;
1354 /*
1355 * Signal bidirectional data payloads to target-core
1356 */
1357 if (flags & TARGET_SCF_BIDI_OP)
1358 se_cmd->se_cmd_flags |= SCF_BIDI;
1359 /*
1360 * Locate se_lun pointer and attach it to struct se_cmd
1361 */
1362 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1363 if (rc) {
1364 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1365 target_put_sess_cmd(se_sess, se_cmd);
1366 return 0;
1367 }
1368 /*
1369 * Save pointers for SGLs containing protection information,
1370 * if present.
1371 */
1372 if (sgl_prot_count) {
1373 se_cmd->t_prot_sg = sgl_prot;
1374 se_cmd->t_prot_nents = sgl_prot_count;
1375 }
1376
1377 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1378 if (rc != 0) {
1379 transport_generic_request_failure(se_cmd, rc);
1380 return 0;
1381 }
1382 /*
1383 * When a non zero sgl_count has been passed perform SGL passthrough
1384 * mapping for pre-allocated fabric memory instead of having target
1385 * core perform an internal SGL allocation..
1386 */
1387 if (sgl_count != 0) {
1388 BUG_ON(!sgl);
1389
1390 /*
1391 * A work-around for tcm_loop as some userspace code via
1392 * scsi-generic do not memset their associated read buffers,
1393 * so go ahead and do that here for type non-data CDBs. Also
1394 * note that this is currently guaranteed to be a single SGL
1395 * for this case by target core in target_setup_cmd_from_cdb()
1396 * -> transport_generic_cmd_sequencer().
1397 */
1398 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1399 se_cmd->data_direction == DMA_FROM_DEVICE) {
1400 unsigned char *buf = NULL;
1401
1402 if (sgl)
1403 buf = kmap(sg_page(sgl)) + sgl->offset;
1404
1405 if (buf) {
1406 memset(buf, 0, sgl->length);
1407 kunmap(sg_page(sgl));
1408 }
1409 }
1410
1411 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1412 sgl_bidi, sgl_bidi_count);
1413 if (rc != 0) {
1414 transport_generic_request_failure(se_cmd, rc);
1415 return 0;
1416 }
1417 }
1418
1419 /*
1420 * Check if we need to delay processing because of ALUA
1421 * Active/NonOptimized primary access state..
1422 */
1423 core_alua_check_nonop_delay(se_cmd);
1424
1425 transport_handle_cdb_direct(se_cmd);
1426 return 0;
1427 }
1428 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1429
1430 /*
1431 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1432 *
1433 * @se_cmd: command descriptor to submit
1434 * @se_sess: associated se_sess for endpoint
1435 * @cdb: pointer to SCSI CDB
1436 * @sense: pointer to SCSI sense buffer
1437 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1438 * @data_length: fabric expected data transfer length
1439 * @task_addr: SAM task attribute
1440 * @data_dir: DMA data direction
1441 * @flags: flags for command submission from target_sc_flags_tables
1442 *
1443 * Returns non zero to signal active I/O shutdown failure. All other
1444 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1445 * but still return zero here.
1446 *
1447 * This may only be called from process context, and also currently
1448 * assumes internal allocation of fabric payload buffer by target-core.
1449 *
1450 * It also assumes interal target core SGL memory allocation.
1451 */
1452 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1453 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1454 u32 data_length, int task_attr, int data_dir, int flags)
1455 {
1456 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1457 unpacked_lun, data_length, task_attr, data_dir,
1458 flags, NULL, 0, NULL, 0, NULL, 0);
1459 }
1460 EXPORT_SYMBOL(target_submit_cmd);
1461
1462 static void target_complete_tmr_failure(struct work_struct *work)
1463 {
1464 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1465
1466 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1467 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1468
1469 transport_cmd_check_stop_to_fabric(se_cmd);
1470 }
1471
1472 /**
1473 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1474 * for TMR CDBs
1475 *
1476 * @se_cmd: command descriptor to submit
1477 * @se_sess: associated se_sess for endpoint
1478 * @sense: pointer to SCSI sense buffer
1479 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1480 * @fabric_context: fabric context for TMR req
1481 * @tm_type: Type of TM request
1482 * @gfp: gfp type for caller
1483 * @tag: referenced task tag for TMR_ABORT_TASK
1484 * @flags: submit cmd flags
1485 *
1486 * Callable from all contexts.
1487 **/
1488
1489 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1490 unsigned char *sense, u32 unpacked_lun,
1491 void *fabric_tmr_ptr, unsigned char tm_type,
1492 gfp_t gfp, unsigned int tag, int flags)
1493 {
1494 struct se_portal_group *se_tpg;
1495 int ret;
1496
1497 se_tpg = se_sess->se_tpg;
1498 BUG_ON(!se_tpg);
1499
1500 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1501 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1502 /*
1503 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1504 * allocation failure.
1505 */
1506 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1507 if (ret < 0)
1508 return -ENOMEM;
1509
1510 if (tm_type == TMR_ABORT_TASK)
1511 se_cmd->se_tmr_req->ref_task_tag = tag;
1512
1513 /* See target_submit_cmd for commentary */
1514 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1515 if (ret) {
1516 core_tmr_release_req(se_cmd->se_tmr_req);
1517 return ret;
1518 }
1519
1520 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1521 if (ret) {
1522 /*
1523 * For callback during failure handling, push this work off
1524 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1525 */
1526 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1527 schedule_work(&se_cmd->work);
1528 return 0;
1529 }
1530 transport_generic_handle_tmr(se_cmd);
1531 return 0;
1532 }
1533 EXPORT_SYMBOL(target_submit_tmr);
1534
1535 /*
1536 * If the cmd is active, request it to be stopped and sleep until it
1537 * has completed.
1538 */
1539 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1540 {
1541 bool was_active = false;
1542
1543 if (cmd->transport_state & CMD_T_BUSY) {
1544 cmd->transport_state |= CMD_T_REQUEST_STOP;
1545 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1546
1547 pr_debug("cmd %p waiting to complete\n", cmd);
1548 wait_for_completion(&cmd->task_stop_comp);
1549 pr_debug("cmd %p stopped successfully\n", cmd);
1550
1551 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1552 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1553 cmd->transport_state &= ~CMD_T_BUSY;
1554 was_active = true;
1555 }
1556
1557 return was_active;
1558 }
1559
1560 /*
1561 * Handle SAM-esque emulation for generic transport request failures.
1562 */
1563 void transport_generic_request_failure(struct se_cmd *cmd,
1564 sense_reason_t sense_reason)
1565 {
1566 int ret = 0;
1567
1568 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1569 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1570 cmd->t_task_cdb[0]);
1571 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1572 cmd->se_tfo->get_cmd_state(cmd),
1573 cmd->t_state, sense_reason);
1574 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1575 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1576 (cmd->transport_state & CMD_T_STOP) != 0,
1577 (cmd->transport_state & CMD_T_SENT) != 0);
1578
1579 /*
1580 * For SAM Task Attribute emulation for failed struct se_cmd
1581 */
1582 transport_complete_task_attr(cmd);
1583 /*
1584 * Handle special case for COMPARE_AND_WRITE failure, where the
1585 * callback is expected to drop the per device ->caw_mutex.
1586 */
1587 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1588 cmd->transport_complete_callback)
1589 cmd->transport_complete_callback(cmd);
1590
1591 switch (sense_reason) {
1592 case TCM_NON_EXISTENT_LUN:
1593 case TCM_UNSUPPORTED_SCSI_OPCODE:
1594 case TCM_INVALID_CDB_FIELD:
1595 case TCM_INVALID_PARAMETER_LIST:
1596 case TCM_PARAMETER_LIST_LENGTH_ERROR:
1597 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1598 case TCM_UNKNOWN_MODE_PAGE:
1599 case TCM_WRITE_PROTECTED:
1600 case TCM_ADDRESS_OUT_OF_RANGE:
1601 case TCM_CHECK_CONDITION_ABORT_CMD:
1602 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1603 case TCM_CHECK_CONDITION_NOT_READY:
1604 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1605 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1606 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1607 break;
1608 case TCM_OUT_OF_RESOURCES:
1609 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1610 break;
1611 case TCM_RESERVATION_CONFLICT:
1612 /*
1613 * No SENSE Data payload for this case, set SCSI Status
1614 * and queue the response to $FABRIC_MOD.
1615 *
1616 * Uses linux/include/scsi/scsi.h SAM status codes defs
1617 */
1618 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1619 /*
1620 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1621 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1622 * CONFLICT STATUS.
1623 *
1624 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1625 */
1626 if (cmd->se_sess &&
1627 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1628 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1629 cmd->orig_fe_lun, 0x2C,
1630 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1631
1632 trace_target_cmd_complete(cmd);
1633 ret = cmd->se_tfo-> queue_status(cmd);
1634 if (ret == -EAGAIN || ret == -ENOMEM)
1635 goto queue_full;
1636 goto check_stop;
1637 default:
1638 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1639 cmd->t_task_cdb[0], sense_reason);
1640 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1641 break;
1642 }
1643
1644 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1645 if (ret == -EAGAIN || ret == -ENOMEM)
1646 goto queue_full;
1647
1648 check_stop:
1649 transport_lun_remove_cmd(cmd);
1650 if (!transport_cmd_check_stop_to_fabric(cmd))
1651 ;
1652 return;
1653
1654 queue_full:
1655 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1656 transport_handle_queue_full(cmd, cmd->se_dev);
1657 }
1658 EXPORT_SYMBOL(transport_generic_request_failure);
1659
1660 void __target_execute_cmd(struct se_cmd *cmd)
1661 {
1662 sense_reason_t ret;
1663
1664 if (cmd->execute_cmd) {
1665 ret = cmd->execute_cmd(cmd);
1666 if (ret) {
1667 spin_lock_irq(&cmd->t_state_lock);
1668 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1669 spin_unlock_irq(&cmd->t_state_lock);
1670
1671 transport_generic_request_failure(cmd, ret);
1672 }
1673 }
1674 }
1675
1676 static bool target_handle_task_attr(struct se_cmd *cmd)
1677 {
1678 struct se_device *dev = cmd->se_dev;
1679
1680 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1681 return false;
1682
1683 /*
1684 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1685 * to allow the passed struct se_cmd list of tasks to the front of the list.
1686 */
1687 switch (cmd->sam_task_attr) {
1688 case MSG_HEAD_TAG:
1689 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1690 "se_ordered_id: %u\n",
1691 cmd->t_task_cdb[0], cmd->se_ordered_id);
1692 return false;
1693 case MSG_ORDERED_TAG:
1694 atomic_inc(&dev->dev_ordered_sync);
1695 smp_mb__after_atomic_inc();
1696
1697 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1698 " se_ordered_id: %u\n",
1699 cmd->t_task_cdb[0], cmd->se_ordered_id);
1700
1701 /*
1702 * Execute an ORDERED command if no other older commands
1703 * exist that need to be completed first.
1704 */
1705 if (!atomic_read(&dev->simple_cmds))
1706 return false;
1707 break;
1708 default:
1709 /*
1710 * For SIMPLE and UNTAGGED Task Attribute commands
1711 */
1712 atomic_inc(&dev->simple_cmds);
1713 smp_mb__after_atomic_inc();
1714 break;
1715 }
1716
1717 if (atomic_read(&dev->dev_ordered_sync) == 0)
1718 return false;
1719
1720 spin_lock(&dev->delayed_cmd_lock);
1721 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1722 spin_unlock(&dev->delayed_cmd_lock);
1723
1724 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1725 " delayed CMD list, se_ordered_id: %u\n",
1726 cmd->t_task_cdb[0], cmd->sam_task_attr,
1727 cmd->se_ordered_id);
1728 return true;
1729 }
1730
1731 void target_execute_cmd(struct se_cmd *cmd)
1732 {
1733 /*
1734 * If the received CDB has aleady been aborted stop processing it here.
1735 */
1736 if (transport_check_aborted_status(cmd, 1))
1737 return;
1738
1739 /*
1740 * Determine if frontend context caller is requesting the stopping of
1741 * this command for frontend exceptions.
1742 */
1743 spin_lock_irq(&cmd->t_state_lock);
1744 if (cmd->transport_state & CMD_T_STOP) {
1745 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1746 __func__, __LINE__,
1747 cmd->se_tfo->get_task_tag(cmd));
1748
1749 spin_unlock_irq(&cmd->t_state_lock);
1750 complete(&cmd->t_transport_stop_comp);
1751 return;
1752 }
1753
1754 cmd->t_state = TRANSPORT_PROCESSING;
1755 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1756 spin_unlock_irq(&cmd->t_state_lock);
1757
1758 if (target_handle_task_attr(cmd)) {
1759 spin_lock_irq(&cmd->t_state_lock);
1760 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1761 spin_unlock_irq(&cmd->t_state_lock);
1762 return;
1763 }
1764
1765 __target_execute_cmd(cmd);
1766 }
1767 EXPORT_SYMBOL(target_execute_cmd);
1768
1769 /*
1770 * Process all commands up to the last received ORDERED task attribute which
1771 * requires another blocking boundary
1772 */
1773 static void target_restart_delayed_cmds(struct se_device *dev)
1774 {
1775 for (;;) {
1776 struct se_cmd *cmd;
1777
1778 spin_lock(&dev->delayed_cmd_lock);
1779 if (list_empty(&dev->delayed_cmd_list)) {
1780 spin_unlock(&dev->delayed_cmd_lock);
1781 break;
1782 }
1783
1784 cmd = list_entry(dev->delayed_cmd_list.next,
1785 struct se_cmd, se_delayed_node);
1786 list_del(&cmd->se_delayed_node);
1787 spin_unlock(&dev->delayed_cmd_lock);
1788
1789 __target_execute_cmd(cmd);
1790
1791 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1792 break;
1793 }
1794 }
1795
1796 /*
1797 * Called from I/O completion to determine which dormant/delayed
1798 * and ordered cmds need to have their tasks added to the execution queue.
1799 */
1800 static void transport_complete_task_attr(struct se_cmd *cmd)
1801 {
1802 struct se_device *dev = cmd->se_dev;
1803
1804 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1805 return;
1806
1807 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1808 atomic_dec(&dev->simple_cmds);
1809 smp_mb__after_atomic_dec();
1810 dev->dev_cur_ordered_id++;
1811 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1812 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1813 cmd->se_ordered_id);
1814 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1815 dev->dev_cur_ordered_id++;
1816 pr_debug("Incremented dev_cur_ordered_id: %u for"
1817 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1818 cmd->se_ordered_id);
1819 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1820 atomic_dec(&dev->dev_ordered_sync);
1821 smp_mb__after_atomic_dec();
1822
1823 dev->dev_cur_ordered_id++;
1824 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1825 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1826 }
1827
1828 target_restart_delayed_cmds(dev);
1829 }
1830
1831 static void transport_complete_qf(struct se_cmd *cmd)
1832 {
1833 int ret = 0;
1834
1835 transport_complete_task_attr(cmd);
1836
1837 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1838 trace_target_cmd_complete(cmd);
1839 ret = cmd->se_tfo->queue_status(cmd);
1840 if (ret)
1841 goto out;
1842 }
1843
1844 switch (cmd->data_direction) {
1845 case DMA_FROM_DEVICE:
1846 trace_target_cmd_complete(cmd);
1847 ret = cmd->se_tfo->queue_data_in(cmd);
1848 break;
1849 case DMA_TO_DEVICE:
1850 if (cmd->se_cmd_flags & SCF_BIDI) {
1851 ret = cmd->se_tfo->queue_data_in(cmd);
1852 if (ret < 0)
1853 break;
1854 }
1855 /* Fall through for DMA_TO_DEVICE */
1856 case DMA_NONE:
1857 trace_target_cmd_complete(cmd);
1858 ret = cmd->se_tfo->queue_status(cmd);
1859 break;
1860 default:
1861 break;
1862 }
1863
1864 out:
1865 if (ret < 0) {
1866 transport_handle_queue_full(cmd, cmd->se_dev);
1867 return;
1868 }
1869 transport_lun_remove_cmd(cmd);
1870 transport_cmd_check_stop_to_fabric(cmd);
1871 }
1872
1873 static void transport_handle_queue_full(
1874 struct se_cmd *cmd,
1875 struct se_device *dev)
1876 {
1877 spin_lock_irq(&dev->qf_cmd_lock);
1878 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1879 atomic_inc(&dev->dev_qf_count);
1880 smp_mb__after_atomic_inc();
1881 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1882
1883 schedule_work(&cmd->se_dev->qf_work_queue);
1884 }
1885
1886 static void target_complete_ok_work(struct work_struct *work)
1887 {
1888 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1889 int ret;
1890
1891 /*
1892 * Check if we need to move delayed/dormant tasks from cmds on the
1893 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1894 * Attribute.
1895 */
1896 transport_complete_task_attr(cmd);
1897
1898 /*
1899 * Check to schedule QUEUE_FULL work, or execute an existing
1900 * cmd->transport_qf_callback()
1901 */
1902 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1903 schedule_work(&cmd->se_dev->qf_work_queue);
1904
1905 /*
1906 * Check if we need to send a sense buffer from
1907 * the struct se_cmd in question.
1908 */
1909 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1910 WARN_ON(!cmd->scsi_status);
1911 ret = transport_send_check_condition_and_sense(
1912 cmd, 0, 1);
1913 if (ret == -EAGAIN || ret == -ENOMEM)
1914 goto queue_full;
1915
1916 transport_lun_remove_cmd(cmd);
1917 transport_cmd_check_stop_to_fabric(cmd);
1918 return;
1919 }
1920 /*
1921 * Check for a callback, used by amongst other things
1922 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
1923 */
1924 if (cmd->transport_complete_callback) {
1925 sense_reason_t rc;
1926
1927 rc = cmd->transport_complete_callback(cmd);
1928 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
1929 return;
1930 } else if (rc) {
1931 ret = transport_send_check_condition_and_sense(cmd,
1932 rc, 0);
1933 if (ret == -EAGAIN || ret == -ENOMEM)
1934 goto queue_full;
1935
1936 transport_lun_remove_cmd(cmd);
1937 transport_cmd_check_stop_to_fabric(cmd);
1938 return;
1939 }
1940 }
1941
1942 switch (cmd->data_direction) {
1943 case DMA_FROM_DEVICE:
1944 spin_lock(&cmd->se_lun->lun_sep_lock);
1945 if (cmd->se_lun->lun_sep) {
1946 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1947 cmd->data_length;
1948 }
1949 spin_unlock(&cmd->se_lun->lun_sep_lock);
1950
1951 trace_target_cmd_complete(cmd);
1952 ret = cmd->se_tfo->queue_data_in(cmd);
1953 if (ret == -EAGAIN || ret == -ENOMEM)
1954 goto queue_full;
1955 break;
1956 case DMA_TO_DEVICE:
1957 spin_lock(&cmd->se_lun->lun_sep_lock);
1958 if (cmd->se_lun->lun_sep) {
1959 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
1960 cmd->data_length;
1961 }
1962 spin_unlock(&cmd->se_lun->lun_sep_lock);
1963 /*
1964 * Check if we need to send READ payload for BIDI-COMMAND
1965 */
1966 if (cmd->se_cmd_flags & SCF_BIDI) {
1967 spin_lock(&cmd->se_lun->lun_sep_lock);
1968 if (cmd->se_lun->lun_sep) {
1969 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1970 cmd->data_length;
1971 }
1972 spin_unlock(&cmd->se_lun->lun_sep_lock);
1973 ret = cmd->se_tfo->queue_data_in(cmd);
1974 if (ret == -EAGAIN || ret == -ENOMEM)
1975 goto queue_full;
1976 break;
1977 }
1978 /* Fall through for DMA_TO_DEVICE */
1979 case DMA_NONE:
1980 trace_target_cmd_complete(cmd);
1981 ret = cmd->se_tfo->queue_status(cmd);
1982 if (ret == -EAGAIN || ret == -ENOMEM)
1983 goto queue_full;
1984 break;
1985 default:
1986 break;
1987 }
1988
1989 transport_lun_remove_cmd(cmd);
1990 transport_cmd_check_stop_to_fabric(cmd);
1991 return;
1992
1993 queue_full:
1994 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
1995 " data_direction: %d\n", cmd, cmd->data_direction);
1996 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1997 transport_handle_queue_full(cmd, cmd->se_dev);
1998 }
1999
2000 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2001 {
2002 struct scatterlist *sg;
2003 int count;
2004
2005 for_each_sg(sgl, sg, nents, count)
2006 __free_page(sg_page(sg));
2007
2008 kfree(sgl);
2009 }
2010
2011 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2012 {
2013 /*
2014 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2015 * emulation, and free + reset pointers if necessary..
2016 */
2017 if (!cmd->t_data_sg_orig)
2018 return;
2019
2020 kfree(cmd->t_data_sg);
2021 cmd->t_data_sg = cmd->t_data_sg_orig;
2022 cmd->t_data_sg_orig = NULL;
2023 cmd->t_data_nents = cmd->t_data_nents_orig;
2024 cmd->t_data_nents_orig = 0;
2025 }
2026
2027 static inline void transport_free_pages(struct se_cmd *cmd)
2028 {
2029 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2030 transport_reset_sgl_orig(cmd);
2031 return;
2032 }
2033 transport_reset_sgl_orig(cmd);
2034
2035 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2036 cmd->t_data_sg = NULL;
2037 cmd->t_data_nents = 0;
2038
2039 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2040 cmd->t_bidi_data_sg = NULL;
2041 cmd->t_bidi_data_nents = 0;
2042 }
2043
2044 /**
2045 * transport_release_cmd - free a command
2046 * @cmd: command to free
2047 *
2048 * This routine unconditionally frees a command, and reference counting
2049 * or list removal must be done in the caller.
2050 */
2051 static int transport_release_cmd(struct se_cmd *cmd)
2052 {
2053 BUG_ON(!cmd->se_tfo);
2054
2055 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2056 core_tmr_release_req(cmd->se_tmr_req);
2057 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2058 kfree(cmd->t_task_cdb);
2059 /*
2060 * If this cmd has been setup with target_get_sess_cmd(), drop
2061 * the kref and call ->release_cmd() in kref callback.
2062 */
2063 return target_put_sess_cmd(cmd->se_sess, cmd);
2064 }
2065
2066 /**
2067 * transport_put_cmd - release a reference to a command
2068 * @cmd: command to release
2069 *
2070 * This routine releases our reference to the command and frees it if possible.
2071 */
2072 static int transport_put_cmd(struct se_cmd *cmd)
2073 {
2074 transport_free_pages(cmd);
2075 return transport_release_cmd(cmd);
2076 }
2077
2078 void *transport_kmap_data_sg(struct se_cmd *cmd)
2079 {
2080 struct scatterlist *sg = cmd->t_data_sg;
2081 struct page **pages;
2082 int i;
2083
2084 /*
2085 * We need to take into account a possible offset here for fabrics like
2086 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2087 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2088 */
2089 if (!cmd->t_data_nents)
2090 return NULL;
2091
2092 BUG_ON(!sg);
2093 if (cmd->t_data_nents == 1)
2094 return kmap(sg_page(sg)) + sg->offset;
2095
2096 /* >1 page. use vmap */
2097 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2098 if (!pages)
2099 return NULL;
2100
2101 /* convert sg[] to pages[] */
2102 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2103 pages[i] = sg_page(sg);
2104 }
2105
2106 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2107 kfree(pages);
2108 if (!cmd->t_data_vmap)
2109 return NULL;
2110
2111 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2112 }
2113 EXPORT_SYMBOL(transport_kmap_data_sg);
2114
2115 void transport_kunmap_data_sg(struct se_cmd *cmd)
2116 {
2117 if (!cmd->t_data_nents) {
2118 return;
2119 } else if (cmd->t_data_nents == 1) {
2120 kunmap(sg_page(cmd->t_data_sg));
2121 return;
2122 }
2123
2124 vunmap(cmd->t_data_vmap);
2125 cmd->t_data_vmap = NULL;
2126 }
2127 EXPORT_SYMBOL(transport_kunmap_data_sg);
2128
2129 int
2130 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2131 bool zero_page)
2132 {
2133 struct scatterlist *sg;
2134 struct page *page;
2135 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2136 unsigned int nent;
2137 int i = 0;
2138
2139 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2140 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2141 if (!sg)
2142 return -ENOMEM;
2143
2144 sg_init_table(sg, nent);
2145
2146 while (length) {
2147 u32 page_len = min_t(u32, length, PAGE_SIZE);
2148 page = alloc_page(GFP_KERNEL | zero_flag);
2149 if (!page)
2150 goto out;
2151
2152 sg_set_page(&sg[i], page, page_len, 0);
2153 length -= page_len;
2154 i++;
2155 }
2156 *sgl = sg;
2157 *nents = nent;
2158 return 0;
2159
2160 out:
2161 while (i > 0) {
2162 i--;
2163 __free_page(sg_page(&sg[i]));
2164 }
2165 kfree(sg);
2166 return -ENOMEM;
2167 }
2168
2169 /*
2170 * Allocate any required resources to execute the command. For writes we
2171 * might not have the payload yet, so notify the fabric via a call to
2172 * ->write_pending instead. Otherwise place it on the execution queue.
2173 */
2174 sense_reason_t
2175 transport_generic_new_cmd(struct se_cmd *cmd)
2176 {
2177 int ret = 0;
2178
2179 /*
2180 * Determine is the TCM fabric module has already allocated physical
2181 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2182 * beforehand.
2183 */
2184 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2185 cmd->data_length) {
2186 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2187
2188 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2189 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2190 u32 bidi_length;
2191
2192 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2193 bidi_length = cmd->t_task_nolb *
2194 cmd->se_dev->dev_attrib.block_size;
2195 else
2196 bidi_length = cmd->data_length;
2197
2198 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2199 &cmd->t_bidi_data_nents,
2200 bidi_length, zero_flag);
2201 if (ret < 0)
2202 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2203 }
2204
2205 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2206 cmd->data_length, zero_flag);
2207 if (ret < 0)
2208 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2209 }
2210 /*
2211 * If this command is not a write we can execute it right here,
2212 * for write buffers we need to notify the fabric driver first
2213 * and let it call back once the write buffers are ready.
2214 */
2215 target_add_to_state_list(cmd);
2216 if (cmd->data_direction != DMA_TO_DEVICE) {
2217 target_execute_cmd(cmd);
2218 return 0;
2219 }
2220 transport_cmd_check_stop(cmd, false, true);
2221
2222 ret = cmd->se_tfo->write_pending(cmd);
2223 if (ret == -EAGAIN || ret == -ENOMEM)
2224 goto queue_full;
2225
2226 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2227 WARN_ON(ret);
2228
2229 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2230
2231 queue_full:
2232 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2233 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2234 transport_handle_queue_full(cmd, cmd->se_dev);
2235 return 0;
2236 }
2237 EXPORT_SYMBOL(transport_generic_new_cmd);
2238
2239 static void transport_write_pending_qf(struct se_cmd *cmd)
2240 {
2241 int ret;
2242
2243 ret = cmd->se_tfo->write_pending(cmd);
2244 if (ret == -EAGAIN || ret == -ENOMEM) {
2245 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2246 cmd);
2247 transport_handle_queue_full(cmd, cmd->se_dev);
2248 }
2249 }
2250
2251 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2252 {
2253 unsigned long flags;
2254 int ret = 0;
2255
2256 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2257 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2258 transport_wait_for_tasks(cmd);
2259
2260 ret = transport_release_cmd(cmd);
2261 } else {
2262 if (wait_for_tasks)
2263 transport_wait_for_tasks(cmd);
2264 /*
2265 * Handle WRITE failure case where transport_generic_new_cmd()
2266 * has already added se_cmd to state_list, but fabric has
2267 * failed command before I/O submission.
2268 */
2269 if (cmd->state_active) {
2270 spin_lock_irqsave(&cmd->t_state_lock, flags);
2271 target_remove_from_state_list(cmd);
2272 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2273 }
2274
2275 if (cmd->se_lun)
2276 transport_lun_remove_cmd(cmd);
2277
2278 ret = transport_put_cmd(cmd);
2279 }
2280 return ret;
2281 }
2282 EXPORT_SYMBOL(transport_generic_free_cmd);
2283
2284 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2285 * @se_sess: session to reference
2286 * @se_cmd: command descriptor to add
2287 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2288 */
2289 int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2290 bool ack_kref)
2291 {
2292 unsigned long flags;
2293 int ret = 0;
2294
2295 kref_init(&se_cmd->cmd_kref);
2296 /*
2297 * Add a second kref if the fabric caller is expecting to handle
2298 * fabric acknowledgement that requires two target_put_sess_cmd()
2299 * invocations before se_cmd descriptor release.
2300 */
2301 if (ack_kref == true) {
2302 kref_get(&se_cmd->cmd_kref);
2303 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2304 }
2305
2306 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2307 if (se_sess->sess_tearing_down) {
2308 ret = -ESHUTDOWN;
2309 goto out;
2310 }
2311 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2312 out:
2313 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2314 return ret;
2315 }
2316 EXPORT_SYMBOL(target_get_sess_cmd);
2317
2318 static void target_release_cmd_kref(struct kref *kref)
2319 {
2320 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2321 struct se_session *se_sess = se_cmd->se_sess;
2322
2323 if (list_empty(&se_cmd->se_cmd_list)) {
2324 spin_unlock(&se_sess->sess_cmd_lock);
2325 se_cmd->se_tfo->release_cmd(se_cmd);
2326 return;
2327 }
2328 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2329 spin_unlock(&se_sess->sess_cmd_lock);
2330 complete(&se_cmd->cmd_wait_comp);
2331 return;
2332 }
2333 list_del(&se_cmd->se_cmd_list);
2334 spin_unlock(&se_sess->sess_cmd_lock);
2335
2336 se_cmd->se_tfo->release_cmd(se_cmd);
2337 }
2338
2339 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2340 * @se_sess: session to reference
2341 * @se_cmd: command descriptor to drop
2342 */
2343 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2344 {
2345 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2346 &se_sess->sess_cmd_lock);
2347 }
2348 EXPORT_SYMBOL(target_put_sess_cmd);
2349
2350 /* target_sess_cmd_list_set_waiting - Flag all commands in
2351 * sess_cmd_list to complete cmd_wait_comp. Set
2352 * sess_tearing_down so no more commands are queued.
2353 * @se_sess: session to flag
2354 */
2355 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2356 {
2357 struct se_cmd *se_cmd;
2358 unsigned long flags;
2359
2360 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2361 if (se_sess->sess_tearing_down) {
2362 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2363 return;
2364 }
2365 se_sess->sess_tearing_down = 1;
2366 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2367
2368 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2369 se_cmd->cmd_wait_set = 1;
2370
2371 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2372 }
2373 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2374
2375 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2376 * @se_sess: session to wait for active I/O
2377 */
2378 void target_wait_for_sess_cmds(struct se_session *se_sess)
2379 {
2380 struct se_cmd *se_cmd, *tmp_cmd;
2381 unsigned long flags;
2382
2383 list_for_each_entry_safe(se_cmd, tmp_cmd,
2384 &se_sess->sess_wait_list, se_cmd_list) {
2385 list_del(&se_cmd->se_cmd_list);
2386
2387 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2388 " %d\n", se_cmd, se_cmd->t_state,
2389 se_cmd->se_tfo->get_cmd_state(se_cmd));
2390
2391 wait_for_completion(&se_cmd->cmd_wait_comp);
2392 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2393 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2394 se_cmd->se_tfo->get_cmd_state(se_cmd));
2395
2396 se_cmd->se_tfo->release_cmd(se_cmd);
2397 }
2398
2399 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2400 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2401 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2402
2403 }
2404 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2405
2406 static int transport_clear_lun_ref_thread(void *p)
2407 {
2408 struct se_lun *lun = p;
2409
2410 percpu_ref_kill(&lun->lun_ref);
2411
2412 wait_for_completion(&lun->lun_ref_comp);
2413 complete(&lun->lun_shutdown_comp);
2414
2415 return 0;
2416 }
2417
2418 int transport_clear_lun_ref(struct se_lun *lun)
2419 {
2420 struct task_struct *kt;
2421
2422 kt = kthread_run(transport_clear_lun_ref_thread, lun,
2423 "tcm_cl_%u", lun->unpacked_lun);
2424 if (IS_ERR(kt)) {
2425 pr_err("Unable to start clear_lun thread\n");
2426 return PTR_ERR(kt);
2427 }
2428 wait_for_completion(&lun->lun_shutdown_comp);
2429
2430 return 0;
2431 }
2432
2433 /**
2434 * transport_wait_for_tasks - wait for completion to occur
2435 * @cmd: command to wait
2436 *
2437 * Called from frontend fabric context to wait for storage engine
2438 * to pause and/or release frontend generated struct se_cmd.
2439 */
2440 bool transport_wait_for_tasks(struct se_cmd *cmd)
2441 {
2442 unsigned long flags;
2443
2444 spin_lock_irqsave(&cmd->t_state_lock, flags);
2445 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2446 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2447 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2448 return false;
2449 }
2450
2451 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2452 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2453 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2454 return false;
2455 }
2456
2457 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2458 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2459 return false;
2460 }
2461
2462 cmd->transport_state |= CMD_T_STOP;
2463
2464 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2465 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2466 cmd, cmd->se_tfo->get_task_tag(cmd),
2467 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2468
2469 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2470
2471 wait_for_completion(&cmd->t_transport_stop_comp);
2472
2473 spin_lock_irqsave(&cmd->t_state_lock, flags);
2474 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2475
2476 pr_debug("wait_for_tasks: Stopped wait_for_completion("
2477 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2478 cmd->se_tfo->get_task_tag(cmd));
2479
2480 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2481
2482 return true;
2483 }
2484 EXPORT_SYMBOL(transport_wait_for_tasks);
2485
2486 static int transport_get_sense_codes(
2487 struct se_cmd *cmd,
2488 u8 *asc,
2489 u8 *ascq)
2490 {
2491 *asc = cmd->scsi_asc;
2492 *ascq = cmd->scsi_ascq;
2493
2494 return 0;
2495 }
2496
2497 static
2498 void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2499 {
2500 /* Place failed LBA in sense data information descriptor 0. */
2501 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2502 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2503 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2504 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2505
2506 /* Descriptor Information: failing sector */
2507 put_unaligned_be64(bad_sector, &buffer[12]);
2508 }
2509
2510 int
2511 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2512 sense_reason_t reason, int from_transport)
2513 {
2514 unsigned char *buffer = cmd->sense_buffer;
2515 unsigned long flags;
2516 u8 asc = 0, ascq = 0;
2517
2518 spin_lock_irqsave(&cmd->t_state_lock, flags);
2519 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2520 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2521 return 0;
2522 }
2523 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2524 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2525
2526 if (!reason && from_transport)
2527 goto after_reason;
2528
2529 if (!from_transport)
2530 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2531
2532 /*
2533 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2534 * SENSE KEY values from include/scsi/scsi.h
2535 */
2536 switch (reason) {
2537 case TCM_NO_SENSE:
2538 /* CURRENT ERROR */
2539 buffer[0] = 0x70;
2540 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2541 /* Not Ready */
2542 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2543 /* NO ADDITIONAL SENSE INFORMATION */
2544 buffer[SPC_ASC_KEY_OFFSET] = 0;
2545 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2546 break;
2547 case TCM_NON_EXISTENT_LUN:
2548 /* CURRENT ERROR */
2549 buffer[0] = 0x70;
2550 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2551 /* ILLEGAL REQUEST */
2552 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2553 /* LOGICAL UNIT NOT SUPPORTED */
2554 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2555 break;
2556 case TCM_UNSUPPORTED_SCSI_OPCODE:
2557 case TCM_SECTOR_COUNT_TOO_MANY:
2558 /* CURRENT ERROR */
2559 buffer[0] = 0x70;
2560 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2561 /* ILLEGAL REQUEST */
2562 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2563 /* INVALID COMMAND OPERATION CODE */
2564 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2565 break;
2566 case TCM_UNKNOWN_MODE_PAGE:
2567 /* CURRENT ERROR */
2568 buffer[0] = 0x70;
2569 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2570 /* ILLEGAL REQUEST */
2571 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2572 /* INVALID FIELD IN CDB */
2573 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2574 break;
2575 case TCM_CHECK_CONDITION_ABORT_CMD:
2576 /* CURRENT ERROR */
2577 buffer[0] = 0x70;
2578 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2579 /* ABORTED COMMAND */
2580 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2581 /* BUS DEVICE RESET FUNCTION OCCURRED */
2582 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2583 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2584 break;
2585 case TCM_INCORRECT_AMOUNT_OF_DATA:
2586 /* CURRENT ERROR */
2587 buffer[0] = 0x70;
2588 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2589 /* ABORTED COMMAND */
2590 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2591 /* WRITE ERROR */
2592 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2593 /* NOT ENOUGH UNSOLICITED DATA */
2594 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2595 break;
2596 case TCM_INVALID_CDB_FIELD:
2597 /* CURRENT ERROR */
2598 buffer[0] = 0x70;
2599 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2600 /* ILLEGAL REQUEST */
2601 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2602 /* INVALID FIELD IN CDB */
2603 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2604 break;
2605 case TCM_INVALID_PARAMETER_LIST:
2606 /* CURRENT ERROR */
2607 buffer[0] = 0x70;
2608 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2609 /* ILLEGAL REQUEST */
2610 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2611 /* INVALID FIELD IN PARAMETER LIST */
2612 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2613 break;
2614 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2615 /* CURRENT ERROR */
2616 buffer[0] = 0x70;
2617 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2618 /* ILLEGAL REQUEST */
2619 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2620 /* PARAMETER LIST LENGTH ERROR */
2621 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2622 break;
2623 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2624 /* CURRENT ERROR */
2625 buffer[0] = 0x70;
2626 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2627 /* ABORTED COMMAND */
2628 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2629 /* WRITE ERROR */
2630 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2631 /* UNEXPECTED_UNSOLICITED_DATA */
2632 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2633 break;
2634 case TCM_SERVICE_CRC_ERROR:
2635 /* CURRENT ERROR */
2636 buffer[0] = 0x70;
2637 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2638 /* ABORTED COMMAND */
2639 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2640 /* PROTOCOL SERVICE CRC ERROR */
2641 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2642 /* N/A */
2643 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2644 break;
2645 case TCM_SNACK_REJECTED:
2646 /* CURRENT ERROR */
2647 buffer[0] = 0x70;
2648 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2649 /* ABORTED COMMAND */
2650 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2651 /* READ ERROR */
2652 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2653 /* FAILED RETRANSMISSION REQUEST */
2654 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2655 break;
2656 case TCM_WRITE_PROTECTED:
2657 /* CURRENT ERROR */
2658 buffer[0] = 0x70;
2659 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2660 /* DATA PROTECT */
2661 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2662 /* WRITE PROTECTED */
2663 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2664 break;
2665 case TCM_ADDRESS_OUT_OF_RANGE:
2666 /* CURRENT ERROR */
2667 buffer[0] = 0x70;
2668 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2669 /* ILLEGAL REQUEST */
2670 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2671 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2672 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2673 break;
2674 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2675 /* CURRENT ERROR */
2676 buffer[0] = 0x70;
2677 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2678 /* UNIT ATTENTION */
2679 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2680 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2681 buffer[SPC_ASC_KEY_OFFSET] = asc;
2682 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2683 break;
2684 case TCM_CHECK_CONDITION_NOT_READY:
2685 /* CURRENT ERROR */
2686 buffer[0] = 0x70;
2687 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2688 /* Not Ready */
2689 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2690 transport_get_sense_codes(cmd, &asc, &ascq);
2691 buffer[SPC_ASC_KEY_OFFSET] = asc;
2692 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2693 break;
2694 case TCM_MISCOMPARE_VERIFY:
2695 /* CURRENT ERROR */
2696 buffer[0] = 0x70;
2697 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2698 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2699 /* MISCOMPARE DURING VERIFY OPERATION */
2700 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2701 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2702 break;
2703 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2704 /* CURRENT ERROR */
2705 buffer[0] = 0x70;
2706 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2707 /* ILLEGAL REQUEST */
2708 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2709 /* LOGICAL BLOCK GUARD CHECK FAILED */
2710 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2711 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
2712 transport_err_sector_info(buffer, cmd->bad_sector);
2713 break;
2714 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2715 /* CURRENT ERROR */
2716 buffer[0] = 0x70;
2717 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2718 /* ILLEGAL REQUEST */
2719 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2720 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2721 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2722 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
2723 transport_err_sector_info(buffer, cmd->bad_sector);
2724 break;
2725 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2726 /* CURRENT ERROR */
2727 buffer[0] = 0x70;
2728 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2729 /* ILLEGAL REQUEST */
2730 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2731 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2732 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2733 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2734 transport_err_sector_info(buffer, cmd->bad_sector);
2735 break;
2736 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2737 default:
2738 /* CURRENT ERROR */
2739 buffer[0] = 0x70;
2740 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2741 /*
2742 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2743 * Solaris initiators. Returning NOT READY instead means the
2744 * operations will be retried a finite number of times and we
2745 * can survive intermittent errors.
2746 */
2747 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2748 /* LOGICAL UNIT COMMUNICATION FAILURE */
2749 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2750 break;
2751 }
2752 /*
2753 * This code uses linux/include/scsi/scsi.h SAM status codes!
2754 */
2755 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2756 /*
2757 * Automatically padded, this value is encoded in the fabric's
2758 * data_length response PDU containing the SCSI defined sense data.
2759 */
2760 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2761
2762 after_reason:
2763 trace_target_cmd_complete(cmd);
2764 return cmd->se_tfo->queue_status(cmd);
2765 }
2766 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2767
2768 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2769 {
2770 if (!(cmd->transport_state & CMD_T_ABORTED))
2771 return 0;
2772
2773 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2774 return 1;
2775
2776 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2777 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
2778
2779 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
2780 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2781 trace_target_cmd_complete(cmd);
2782 cmd->se_tfo->queue_status(cmd);
2783
2784 return 1;
2785 }
2786 EXPORT_SYMBOL(transport_check_aborted_status);
2787
2788 void transport_send_task_abort(struct se_cmd *cmd)
2789 {
2790 unsigned long flags;
2791
2792 spin_lock_irqsave(&cmd->t_state_lock, flags);
2793 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
2794 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2795 return;
2796 }
2797 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2798
2799 /*
2800 * If there are still expected incoming fabric WRITEs, we wait
2801 * until until they have completed before sending a TASK_ABORTED
2802 * response. This response with TASK_ABORTED status will be
2803 * queued back to fabric module by transport_check_aborted_status().
2804 */
2805 if (cmd->data_direction == DMA_TO_DEVICE) {
2806 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2807 cmd->transport_state |= CMD_T_ABORTED;
2808 smp_mb__after_atomic_inc();
2809 return;
2810 }
2811 }
2812 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2813
2814 transport_lun_remove_cmd(cmd);
2815
2816 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2817 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
2818 cmd->se_tfo->get_task_tag(cmd));
2819
2820 trace_target_cmd_complete(cmd);
2821 cmd->se_tfo->queue_status(cmd);
2822 }
2823
2824 static void target_tmr_work(struct work_struct *work)
2825 {
2826 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2827 struct se_device *dev = cmd->se_dev;
2828 struct se_tmr_req *tmr = cmd->se_tmr_req;
2829 int ret;
2830
2831 switch (tmr->function) {
2832 case TMR_ABORT_TASK:
2833 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2834 break;
2835 case TMR_ABORT_TASK_SET:
2836 case TMR_CLEAR_ACA:
2837 case TMR_CLEAR_TASK_SET:
2838 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2839 break;
2840 case TMR_LUN_RESET:
2841 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2842 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2843 TMR_FUNCTION_REJECTED;
2844 break;
2845 case TMR_TARGET_WARM_RESET:
2846 tmr->response = TMR_FUNCTION_REJECTED;
2847 break;
2848 case TMR_TARGET_COLD_RESET:
2849 tmr->response = TMR_FUNCTION_REJECTED;
2850 break;
2851 default:
2852 pr_err("Uknown TMR function: 0x%02x.\n",
2853 tmr->function);
2854 tmr->response = TMR_FUNCTION_REJECTED;
2855 break;
2856 }
2857
2858 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
2859 cmd->se_tfo->queue_tm_rsp(cmd);
2860
2861 transport_cmd_check_stop_to_fabric(cmd);
2862 }
2863
2864 int transport_generic_handle_tmr(
2865 struct se_cmd *cmd)
2866 {
2867 INIT_WORK(&cmd->work, target_tmr_work);
2868 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
2869 return 0;
2870 }
2871 EXPORT_SYMBOL(transport_generic_handle_tmr);
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