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Merge tag 'for-linus-v3.6-rc7' of git://oss.sgi.com/xfs/xfs
[deliverable/linux.git] / drivers / target / target_core_transport.c
1 /*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
29 #include <linux/net.h>
30 #include <linux/delay.h>
31 #include <linux/string.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
37 #include <linux/in.h>
38 #include <linux/cdrom.h>
39 #include <linux/module.h>
40 #include <linux/ratelimit.h>
41 #include <asm/unaligned.h>
42 #include <net/sock.h>
43 #include <net/tcp.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/scsi_tcq.h>
47
48 #include <target/target_core_base.h>
49 #include <target/target_core_backend.h>
50 #include <target/target_core_fabric.h>
51 #include <target/target_core_configfs.h>
52
53 #include "target_core_internal.h"
54 #include "target_core_alua.h"
55 #include "target_core_pr.h"
56 #include "target_core_ua.h"
57
58 static int sub_api_initialized;
59
60 static struct workqueue_struct *target_completion_wq;
61 static struct kmem_cache *se_sess_cache;
62 struct kmem_cache *se_ua_cache;
63 struct kmem_cache *t10_pr_reg_cache;
64 struct kmem_cache *t10_alua_lu_gp_cache;
65 struct kmem_cache *t10_alua_lu_gp_mem_cache;
66 struct kmem_cache *t10_alua_tg_pt_gp_cache;
67 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
68
69 static void transport_complete_task_attr(struct se_cmd *cmd);
70 static void transport_handle_queue_full(struct se_cmd *cmd,
71 struct se_device *dev);
72 static int transport_generic_get_mem(struct se_cmd *cmd);
73 static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
74 static void transport_put_cmd(struct se_cmd *cmd);
75 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
76 static void target_complete_ok_work(struct work_struct *work);
77
78 int init_se_kmem_caches(void)
79 {
80 se_sess_cache = kmem_cache_create("se_sess_cache",
81 sizeof(struct se_session), __alignof__(struct se_session),
82 0, NULL);
83 if (!se_sess_cache) {
84 pr_err("kmem_cache_create() for struct se_session"
85 " failed\n");
86 goto out;
87 }
88 se_ua_cache = kmem_cache_create("se_ua_cache",
89 sizeof(struct se_ua), __alignof__(struct se_ua),
90 0, NULL);
91 if (!se_ua_cache) {
92 pr_err("kmem_cache_create() for struct se_ua failed\n");
93 goto out_free_sess_cache;
94 }
95 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
96 sizeof(struct t10_pr_registration),
97 __alignof__(struct t10_pr_registration), 0, NULL);
98 if (!t10_pr_reg_cache) {
99 pr_err("kmem_cache_create() for struct t10_pr_registration"
100 " failed\n");
101 goto out_free_ua_cache;
102 }
103 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
104 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
105 0, NULL);
106 if (!t10_alua_lu_gp_cache) {
107 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
108 " failed\n");
109 goto out_free_pr_reg_cache;
110 }
111 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
112 sizeof(struct t10_alua_lu_gp_member),
113 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
114 if (!t10_alua_lu_gp_mem_cache) {
115 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
116 "cache failed\n");
117 goto out_free_lu_gp_cache;
118 }
119 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
120 sizeof(struct t10_alua_tg_pt_gp),
121 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
122 if (!t10_alua_tg_pt_gp_cache) {
123 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
124 "cache failed\n");
125 goto out_free_lu_gp_mem_cache;
126 }
127 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
128 "t10_alua_tg_pt_gp_mem_cache",
129 sizeof(struct t10_alua_tg_pt_gp_member),
130 __alignof__(struct t10_alua_tg_pt_gp_member),
131 0, NULL);
132 if (!t10_alua_tg_pt_gp_mem_cache) {
133 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
134 "mem_t failed\n");
135 goto out_free_tg_pt_gp_cache;
136 }
137
138 target_completion_wq = alloc_workqueue("target_completion",
139 WQ_MEM_RECLAIM, 0);
140 if (!target_completion_wq)
141 goto out_free_tg_pt_gp_mem_cache;
142
143 return 0;
144
145 out_free_tg_pt_gp_mem_cache:
146 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
147 out_free_tg_pt_gp_cache:
148 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
149 out_free_lu_gp_mem_cache:
150 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
151 out_free_lu_gp_cache:
152 kmem_cache_destroy(t10_alua_lu_gp_cache);
153 out_free_pr_reg_cache:
154 kmem_cache_destroy(t10_pr_reg_cache);
155 out_free_ua_cache:
156 kmem_cache_destroy(se_ua_cache);
157 out_free_sess_cache:
158 kmem_cache_destroy(se_sess_cache);
159 out:
160 return -ENOMEM;
161 }
162
163 void release_se_kmem_caches(void)
164 {
165 destroy_workqueue(target_completion_wq);
166 kmem_cache_destroy(se_sess_cache);
167 kmem_cache_destroy(se_ua_cache);
168 kmem_cache_destroy(t10_pr_reg_cache);
169 kmem_cache_destroy(t10_alua_lu_gp_cache);
170 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
171 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
172 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
173 }
174
175 /* This code ensures unique mib indexes are handed out. */
176 static DEFINE_SPINLOCK(scsi_mib_index_lock);
177 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
178
179 /*
180 * Allocate a new row index for the entry type specified
181 */
182 u32 scsi_get_new_index(scsi_index_t type)
183 {
184 u32 new_index;
185
186 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
187
188 spin_lock(&scsi_mib_index_lock);
189 new_index = ++scsi_mib_index[type];
190 spin_unlock(&scsi_mib_index_lock);
191
192 return new_index;
193 }
194
195 void transport_subsystem_check_init(void)
196 {
197 int ret;
198
199 if (sub_api_initialized)
200 return;
201
202 ret = request_module("target_core_iblock");
203 if (ret != 0)
204 pr_err("Unable to load target_core_iblock\n");
205
206 ret = request_module("target_core_file");
207 if (ret != 0)
208 pr_err("Unable to load target_core_file\n");
209
210 ret = request_module("target_core_pscsi");
211 if (ret != 0)
212 pr_err("Unable to load target_core_pscsi\n");
213
214 ret = request_module("target_core_stgt");
215 if (ret != 0)
216 pr_err("Unable to load target_core_stgt\n");
217
218 sub_api_initialized = 1;
219 return;
220 }
221
222 struct se_session *transport_init_session(void)
223 {
224 struct se_session *se_sess;
225
226 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
227 if (!se_sess) {
228 pr_err("Unable to allocate struct se_session from"
229 " se_sess_cache\n");
230 return ERR_PTR(-ENOMEM);
231 }
232 INIT_LIST_HEAD(&se_sess->sess_list);
233 INIT_LIST_HEAD(&se_sess->sess_acl_list);
234 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
235 spin_lock_init(&se_sess->sess_cmd_lock);
236 kref_init(&se_sess->sess_kref);
237
238 return se_sess;
239 }
240 EXPORT_SYMBOL(transport_init_session);
241
242 /*
243 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
244 */
245 void __transport_register_session(
246 struct se_portal_group *se_tpg,
247 struct se_node_acl *se_nacl,
248 struct se_session *se_sess,
249 void *fabric_sess_ptr)
250 {
251 unsigned char buf[PR_REG_ISID_LEN];
252
253 se_sess->se_tpg = se_tpg;
254 se_sess->fabric_sess_ptr = fabric_sess_ptr;
255 /*
256 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
257 *
258 * Only set for struct se_session's that will actually be moving I/O.
259 * eg: *NOT* discovery sessions.
260 */
261 if (se_nacl) {
262 /*
263 * If the fabric module supports an ISID based TransportID,
264 * save this value in binary from the fabric I_T Nexus now.
265 */
266 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
267 memset(&buf[0], 0, PR_REG_ISID_LEN);
268 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
269 &buf[0], PR_REG_ISID_LEN);
270 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
271 }
272 kref_get(&se_nacl->acl_kref);
273
274 spin_lock_irq(&se_nacl->nacl_sess_lock);
275 /*
276 * The se_nacl->nacl_sess pointer will be set to the
277 * last active I_T Nexus for each struct se_node_acl.
278 */
279 se_nacl->nacl_sess = se_sess;
280
281 list_add_tail(&se_sess->sess_acl_list,
282 &se_nacl->acl_sess_list);
283 spin_unlock_irq(&se_nacl->nacl_sess_lock);
284 }
285 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
286
287 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
288 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
289 }
290 EXPORT_SYMBOL(__transport_register_session);
291
292 void transport_register_session(
293 struct se_portal_group *se_tpg,
294 struct se_node_acl *se_nacl,
295 struct se_session *se_sess,
296 void *fabric_sess_ptr)
297 {
298 unsigned long flags;
299
300 spin_lock_irqsave(&se_tpg->session_lock, flags);
301 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
302 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
303 }
304 EXPORT_SYMBOL(transport_register_session);
305
306 void target_release_session(struct kref *kref)
307 {
308 struct se_session *se_sess = container_of(kref,
309 struct se_session, sess_kref);
310 struct se_portal_group *se_tpg = se_sess->se_tpg;
311
312 se_tpg->se_tpg_tfo->close_session(se_sess);
313 }
314
315 void target_get_session(struct se_session *se_sess)
316 {
317 kref_get(&se_sess->sess_kref);
318 }
319 EXPORT_SYMBOL(target_get_session);
320
321 void target_put_session(struct se_session *se_sess)
322 {
323 struct se_portal_group *tpg = se_sess->se_tpg;
324
325 if (tpg->se_tpg_tfo->put_session != NULL) {
326 tpg->se_tpg_tfo->put_session(se_sess);
327 return;
328 }
329 kref_put(&se_sess->sess_kref, target_release_session);
330 }
331 EXPORT_SYMBOL(target_put_session);
332
333 static void target_complete_nacl(struct kref *kref)
334 {
335 struct se_node_acl *nacl = container_of(kref,
336 struct se_node_acl, acl_kref);
337
338 complete(&nacl->acl_free_comp);
339 }
340
341 void target_put_nacl(struct se_node_acl *nacl)
342 {
343 kref_put(&nacl->acl_kref, target_complete_nacl);
344 }
345
346 void transport_deregister_session_configfs(struct se_session *se_sess)
347 {
348 struct se_node_acl *se_nacl;
349 unsigned long flags;
350 /*
351 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
352 */
353 se_nacl = se_sess->se_node_acl;
354 if (se_nacl) {
355 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
356 if (se_nacl->acl_stop == 0)
357 list_del(&se_sess->sess_acl_list);
358 /*
359 * If the session list is empty, then clear the pointer.
360 * Otherwise, set the struct se_session pointer from the tail
361 * element of the per struct se_node_acl active session list.
362 */
363 if (list_empty(&se_nacl->acl_sess_list))
364 se_nacl->nacl_sess = NULL;
365 else {
366 se_nacl->nacl_sess = container_of(
367 se_nacl->acl_sess_list.prev,
368 struct se_session, sess_acl_list);
369 }
370 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
371 }
372 }
373 EXPORT_SYMBOL(transport_deregister_session_configfs);
374
375 void transport_free_session(struct se_session *se_sess)
376 {
377 kmem_cache_free(se_sess_cache, se_sess);
378 }
379 EXPORT_SYMBOL(transport_free_session);
380
381 void transport_deregister_session(struct se_session *se_sess)
382 {
383 struct se_portal_group *se_tpg = se_sess->se_tpg;
384 struct target_core_fabric_ops *se_tfo;
385 struct se_node_acl *se_nacl;
386 unsigned long flags;
387 bool comp_nacl = true;
388
389 if (!se_tpg) {
390 transport_free_session(se_sess);
391 return;
392 }
393 se_tfo = se_tpg->se_tpg_tfo;
394
395 spin_lock_irqsave(&se_tpg->session_lock, flags);
396 list_del(&se_sess->sess_list);
397 se_sess->se_tpg = NULL;
398 se_sess->fabric_sess_ptr = NULL;
399 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
400
401 /*
402 * Determine if we need to do extra work for this initiator node's
403 * struct se_node_acl if it had been previously dynamically generated.
404 */
405 se_nacl = se_sess->se_node_acl;
406
407 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
408 if (se_nacl && se_nacl->dynamic_node_acl) {
409 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
410 list_del(&se_nacl->acl_list);
411 se_tpg->num_node_acls--;
412 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
413 core_tpg_wait_for_nacl_pr_ref(se_nacl);
414 core_free_device_list_for_node(se_nacl, se_tpg);
415 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
416
417 comp_nacl = false;
418 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
419 }
420 }
421 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
422
423 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
424 se_tpg->se_tpg_tfo->get_fabric_name());
425 /*
426 * If last kref is dropping now for an explict NodeACL, awake sleeping
427 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
428 * removal context.
429 */
430 if (se_nacl && comp_nacl == true)
431 target_put_nacl(se_nacl);
432
433 transport_free_session(se_sess);
434 }
435 EXPORT_SYMBOL(transport_deregister_session);
436
437 /*
438 * Called with cmd->t_state_lock held.
439 */
440 static void target_remove_from_state_list(struct se_cmd *cmd)
441 {
442 struct se_device *dev = cmd->se_dev;
443 unsigned long flags;
444
445 if (!dev)
446 return;
447
448 if (cmd->transport_state & CMD_T_BUSY)
449 return;
450
451 spin_lock_irqsave(&dev->execute_task_lock, flags);
452 if (cmd->state_active) {
453 list_del(&cmd->state_list);
454 cmd->state_active = false;
455 }
456 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
457 }
458
459 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
460 {
461 unsigned long flags;
462
463 spin_lock_irqsave(&cmd->t_state_lock, flags);
464 /*
465 * Determine if IOCTL context caller in requesting the stopping of this
466 * command for LUN shutdown purposes.
467 */
468 if (cmd->transport_state & CMD_T_LUN_STOP) {
469 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
470 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
471
472 cmd->transport_state &= ~CMD_T_ACTIVE;
473 if (remove_from_lists)
474 target_remove_from_state_list(cmd);
475 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
476
477 complete(&cmd->transport_lun_stop_comp);
478 return 1;
479 }
480
481 if (remove_from_lists) {
482 target_remove_from_state_list(cmd);
483
484 /*
485 * Clear struct se_cmd->se_lun before the handoff to FE.
486 */
487 cmd->se_lun = NULL;
488 }
489
490 /*
491 * Determine if frontend context caller is requesting the stopping of
492 * this command for frontend exceptions.
493 */
494 if (cmd->transport_state & CMD_T_STOP) {
495 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
496 __func__, __LINE__,
497 cmd->se_tfo->get_task_tag(cmd));
498
499 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
500
501 complete(&cmd->t_transport_stop_comp);
502 return 1;
503 }
504
505 cmd->transport_state &= ~CMD_T_ACTIVE;
506 if (remove_from_lists) {
507 /*
508 * Some fabric modules like tcm_loop can release
509 * their internally allocated I/O reference now and
510 * struct se_cmd now.
511 *
512 * Fabric modules are expected to return '1' here if the
513 * se_cmd being passed is released at this point,
514 * or zero if not being released.
515 */
516 if (cmd->se_tfo->check_stop_free != NULL) {
517 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
518 return cmd->se_tfo->check_stop_free(cmd);
519 }
520 }
521
522 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
523 return 0;
524 }
525
526 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
527 {
528 return transport_cmd_check_stop(cmd, true);
529 }
530
531 static void transport_lun_remove_cmd(struct se_cmd *cmd)
532 {
533 struct se_lun *lun = cmd->se_lun;
534 unsigned long flags;
535
536 if (!lun)
537 return;
538
539 spin_lock_irqsave(&cmd->t_state_lock, flags);
540 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
541 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
542 target_remove_from_state_list(cmd);
543 }
544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
545
546 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
547 if (!list_empty(&cmd->se_lun_node))
548 list_del_init(&cmd->se_lun_node);
549 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
550 }
551
552 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
553 {
554 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
555 transport_lun_remove_cmd(cmd);
556
557 if (transport_cmd_check_stop_to_fabric(cmd))
558 return;
559 if (remove)
560 transport_put_cmd(cmd);
561 }
562
563 static void target_complete_failure_work(struct work_struct *work)
564 {
565 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
566
567 transport_generic_request_failure(cmd);
568 }
569
570 /*
571 * Used when asking transport to copy Sense Data from the underlying
572 * Linux/SCSI struct scsi_cmnd
573 */
574 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
575 {
576 unsigned char *buffer = cmd->sense_buffer;
577 struct se_device *dev = cmd->se_dev;
578 u32 offset = 0;
579
580 WARN_ON(!cmd->se_lun);
581
582 if (!dev)
583 return NULL;
584
585 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
586 return NULL;
587
588 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
589
590 /* Automatically padded */
591 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
592
593 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
594 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
595 return &buffer[offset];
596 }
597
598 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
599 {
600 struct se_device *dev = cmd->se_dev;
601 int success = scsi_status == GOOD;
602 unsigned long flags;
603
604 cmd->scsi_status = scsi_status;
605
606
607 spin_lock_irqsave(&cmd->t_state_lock, flags);
608 cmd->transport_state &= ~CMD_T_BUSY;
609
610 if (dev && dev->transport->transport_complete) {
611 dev->transport->transport_complete(cmd,
612 cmd->t_data_sg,
613 transport_get_sense_buffer(cmd));
614 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
615 success = 1;
616 }
617
618 /*
619 * See if we are waiting to complete for an exception condition.
620 */
621 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
622 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
623 complete(&cmd->task_stop_comp);
624 return;
625 }
626
627 if (!success)
628 cmd->transport_state |= CMD_T_FAILED;
629
630 /*
631 * Check for case where an explict ABORT_TASK has been received
632 * and transport_wait_for_tasks() will be waiting for completion..
633 */
634 if (cmd->transport_state & CMD_T_ABORTED &&
635 cmd->transport_state & CMD_T_STOP) {
636 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
637 complete(&cmd->t_transport_stop_comp);
638 return;
639 } else if (cmd->transport_state & CMD_T_FAILED) {
640 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
641 INIT_WORK(&cmd->work, target_complete_failure_work);
642 } else {
643 INIT_WORK(&cmd->work, target_complete_ok_work);
644 }
645
646 cmd->t_state = TRANSPORT_COMPLETE;
647 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
648 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
649
650 queue_work(target_completion_wq, &cmd->work);
651 }
652 EXPORT_SYMBOL(target_complete_cmd);
653
654 static void target_add_to_state_list(struct se_cmd *cmd)
655 {
656 struct se_device *dev = cmd->se_dev;
657 unsigned long flags;
658
659 spin_lock_irqsave(&dev->execute_task_lock, flags);
660 if (!cmd->state_active) {
661 list_add_tail(&cmd->state_list, &dev->state_list);
662 cmd->state_active = true;
663 }
664 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
665 }
666
667 /*
668 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
669 */
670 static void transport_write_pending_qf(struct se_cmd *cmd);
671 static void transport_complete_qf(struct se_cmd *cmd);
672
673 static void target_qf_do_work(struct work_struct *work)
674 {
675 struct se_device *dev = container_of(work, struct se_device,
676 qf_work_queue);
677 LIST_HEAD(qf_cmd_list);
678 struct se_cmd *cmd, *cmd_tmp;
679
680 spin_lock_irq(&dev->qf_cmd_lock);
681 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
682 spin_unlock_irq(&dev->qf_cmd_lock);
683
684 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
685 list_del(&cmd->se_qf_node);
686 atomic_dec(&dev->dev_qf_count);
687 smp_mb__after_atomic_dec();
688
689 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
690 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
691 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
692 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
693 : "UNKNOWN");
694
695 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
696 transport_write_pending_qf(cmd);
697 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
698 transport_complete_qf(cmd);
699 }
700 }
701
702 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
703 {
704 switch (cmd->data_direction) {
705 case DMA_NONE:
706 return "NONE";
707 case DMA_FROM_DEVICE:
708 return "READ";
709 case DMA_TO_DEVICE:
710 return "WRITE";
711 case DMA_BIDIRECTIONAL:
712 return "BIDI";
713 default:
714 break;
715 }
716
717 return "UNKNOWN";
718 }
719
720 void transport_dump_dev_state(
721 struct se_device *dev,
722 char *b,
723 int *bl)
724 {
725 *bl += sprintf(b + *bl, "Status: ");
726 switch (dev->dev_status) {
727 case TRANSPORT_DEVICE_ACTIVATED:
728 *bl += sprintf(b + *bl, "ACTIVATED");
729 break;
730 case TRANSPORT_DEVICE_DEACTIVATED:
731 *bl += sprintf(b + *bl, "DEACTIVATED");
732 break;
733 case TRANSPORT_DEVICE_SHUTDOWN:
734 *bl += sprintf(b + *bl, "SHUTDOWN");
735 break;
736 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
737 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
738 *bl += sprintf(b + *bl, "OFFLINE");
739 break;
740 default:
741 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
742 break;
743 }
744
745 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
746 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
747 dev->se_sub_dev->se_dev_attrib.block_size,
748 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
749 *bl += sprintf(b + *bl, " ");
750 }
751
752 void transport_dump_vpd_proto_id(
753 struct t10_vpd *vpd,
754 unsigned char *p_buf,
755 int p_buf_len)
756 {
757 unsigned char buf[VPD_TMP_BUF_SIZE];
758 int len;
759
760 memset(buf, 0, VPD_TMP_BUF_SIZE);
761 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
762
763 switch (vpd->protocol_identifier) {
764 case 0x00:
765 sprintf(buf+len, "Fibre Channel\n");
766 break;
767 case 0x10:
768 sprintf(buf+len, "Parallel SCSI\n");
769 break;
770 case 0x20:
771 sprintf(buf+len, "SSA\n");
772 break;
773 case 0x30:
774 sprintf(buf+len, "IEEE 1394\n");
775 break;
776 case 0x40:
777 sprintf(buf+len, "SCSI Remote Direct Memory Access"
778 " Protocol\n");
779 break;
780 case 0x50:
781 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
782 break;
783 case 0x60:
784 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
785 break;
786 case 0x70:
787 sprintf(buf+len, "Automation/Drive Interface Transport"
788 " Protocol\n");
789 break;
790 case 0x80:
791 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
792 break;
793 default:
794 sprintf(buf+len, "Unknown 0x%02x\n",
795 vpd->protocol_identifier);
796 break;
797 }
798
799 if (p_buf)
800 strncpy(p_buf, buf, p_buf_len);
801 else
802 pr_debug("%s", buf);
803 }
804
805 void
806 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
807 {
808 /*
809 * Check if the Protocol Identifier Valid (PIV) bit is set..
810 *
811 * from spc3r23.pdf section 7.5.1
812 */
813 if (page_83[1] & 0x80) {
814 vpd->protocol_identifier = (page_83[0] & 0xf0);
815 vpd->protocol_identifier_set = 1;
816 transport_dump_vpd_proto_id(vpd, NULL, 0);
817 }
818 }
819 EXPORT_SYMBOL(transport_set_vpd_proto_id);
820
821 int transport_dump_vpd_assoc(
822 struct t10_vpd *vpd,
823 unsigned char *p_buf,
824 int p_buf_len)
825 {
826 unsigned char buf[VPD_TMP_BUF_SIZE];
827 int ret = 0;
828 int len;
829
830 memset(buf, 0, VPD_TMP_BUF_SIZE);
831 len = sprintf(buf, "T10 VPD Identifier Association: ");
832
833 switch (vpd->association) {
834 case 0x00:
835 sprintf(buf+len, "addressed logical unit\n");
836 break;
837 case 0x10:
838 sprintf(buf+len, "target port\n");
839 break;
840 case 0x20:
841 sprintf(buf+len, "SCSI target device\n");
842 break;
843 default:
844 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
845 ret = -EINVAL;
846 break;
847 }
848
849 if (p_buf)
850 strncpy(p_buf, buf, p_buf_len);
851 else
852 pr_debug("%s", buf);
853
854 return ret;
855 }
856
857 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
858 {
859 /*
860 * The VPD identification association..
861 *
862 * from spc3r23.pdf Section 7.6.3.1 Table 297
863 */
864 vpd->association = (page_83[1] & 0x30);
865 return transport_dump_vpd_assoc(vpd, NULL, 0);
866 }
867 EXPORT_SYMBOL(transport_set_vpd_assoc);
868
869 int transport_dump_vpd_ident_type(
870 struct t10_vpd *vpd,
871 unsigned char *p_buf,
872 int p_buf_len)
873 {
874 unsigned char buf[VPD_TMP_BUF_SIZE];
875 int ret = 0;
876 int len;
877
878 memset(buf, 0, VPD_TMP_BUF_SIZE);
879 len = sprintf(buf, "T10 VPD Identifier Type: ");
880
881 switch (vpd->device_identifier_type) {
882 case 0x00:
883 sprintf(buf+len, "Vendor specific\n");
884 break;
885 case 0x01:
886 sprintf(buf+len, "T10 Vendor ID based\n");
887 break;
888 case 0x02:
889 sprintf(buf+len, "EUI-64 based\n");
890 break;
891 case 0x03:
892 sprintf(buf+len, "NAA\n");
893 break;
894 case 0x04:
895 sprintf(buf+len, "Relative target port identifier\n");
896 break;
897 case 0x08:
898 sprintf(buf+len, "SCSI name string\n");
899 break;
900 default:
901 sprintf(buf+len, "Unsupported: 0x%02x\n",
902 vpd->device_identifier_type);
903 ret = -EINVAL;
904 break;
905 }
906
907 if (p_buf) {
908 if (p_buf_len < strlen(buf)+1)
909 return -EINVAL;
910 strncpy(p_buf, buf, p_buf_len);
911 } else {
912 pr_debug("%s", buf);
913 }
914
915 return ret;
916 }
917
918 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
919 {
920 /*
921 * The VPD identifier type..
922 *
923 * from spc3r23.pdf Section 7.6.3.1 Table 298
924 */
925 vpd->device_identifier_type = (page_83[1] & 0x0f);
926 return transport_dump_vpd_ident_type(vpd, NULL, 0);
927 }
928 EXPORT_SYMBOL(transport_set_vpd_ident_type);
929
930 int transport_dump_vpd_ident(
931 struct t10_vpd *vpd,
932 unsigned char *p_buf,
933 int p_buf_len)
934 {
935 unsigned char buf[VPD_TMP_BUF_SIZE];
936 int ret = 0;
937
938 memset(buf, 0, VPD_TMP_BUF_SIZE);
939
940 switch (vpd->device_identifier_code_set) {
941 case 0x01: /* Binary */
942 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
943 &vpd->device_identifier[0]);
944 break;
945 case 0x02: /* ASCII */
946 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
947 &vpd->device_identifier[0]);
948 break;
949 case 0x03: /* UTF-8 */
950 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
951 &vpd->device_identifier[0]);
952 break;
953 default:
954 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
955 " 0x%02x", vpd->device_identifier_code_set);
956 ret = -EINVAL;
957 break;
958 }
959
960 if (p_buf)
961 strncpy(p_buf, buf, p_buf_len);
962 else
963 pr_debug("%s", buf);
964
965 return ret;
966 }
967
968 int
969 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
970 {
971 static const char hex_str[] = "0123456789abcdef";
972 int j = 0, i = 4; /* offset to start of the identifer */
973
974 /*
975 * The VPD Code Set (encoding)
976 *
977 * from spc3r23.pdf Section 7.6.3.1 Table 296
978 */
979 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
980 switch (vpd->device_identifier_code_set) {
981 case 0x01: /* Binary */
982 vpd->device_identifier[j++] =
983 hex_str[vpd->device_identifier_type];
984 while (i < (4 + page_83[3])) {
985 vpd->device_identifier[j++] =
986 hex_str[(page_83[i] & 0xf0) >> 4];
987 vpd->device_identifier[j++] =
988 hex_str[page_83[i] & 0x0f];
989 i++;
990 }
991 break;
992 case 0x02: /* ASCII */
993 case 0x03: /* UTF-8 */
994 while (i < (4 + page_83[3]))
995 vpd->device_identifier[j++] = page_83[i++];
996 break;
997 default:
998 break;
999 }
1000
1001 return transport_dump_vpd_ident(vpd, NULL, 0);
1002 }
1003 EXPORT_SYMBOL(transport_set_vpd_ident);
1004
1005 static void core_setup_task_attr_emulation(struct se_device *dev)
1006 {
1007 /*
1008 * If this device is from Target_Core_Mod/pSCSI, disable the
1009 * SAM Task Attribute emulation.
1010 *
1011 * This is currently not available in upsream Linux/SCSI Target
1012 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1013 */
1014 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1015 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1016 return;
1017 }
1018
1019 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1020 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1021 " device\n", dev->transport->name,
1022 dev->transport->get_device_rev(dev));
1023 }
1024
1025 static void scsi_dump_inquiry(struct se_device *dev)
1026 {
1027 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1028 char buf[17];
1029 int i, device_type;
1030 /*
1031 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1032 */
1033 for (i = 0; i < 8; i++)
1034 if (wwn->vendor[i] >= 0x20)
1035 buf[i] = wwn->vendor[i];
1036 else
1037 buf[i] = ' ';
1038 buf[i] = '\0';
1039 pr_debug(" Vendor: %s\n", buf);
1040
1041 for (i = 0; i < 16; i++)
1042 if (wwn->model[i] >= 0x20)
1043 buf[i] = wwn->model[i];
1044 else
1045 buf[i] = ' ';
1046 buf[i] = '\0';
1047 pr_debug(" Model: %s\n", buf);
1048
1049 for (i = 0; i < 4; i++)
1050 if (wwn->revision[i] >= 0x20)
1051 buf[i] = wwn->revision[i];
1052 else
1053 buf[i] = ' ';
1054 buf[i] = '\0';
1055 pr_debug(" Revision: %s\n", buf);
1056
1057 device_type = dev->transport->get_device_type(dev);
1058 pr_debug(" Type: %s ", scsi_device_type(device_type));
1059 pr_debug(" ANSI SCSI revision: %02x\n",
1060 dev->transport->get_device_rev(dev));
1061 }
1062
1063 struct se_device *transport_add_device_to_core_hba(
1064 struct se_hba *hba,
1065 struct se_subsystem_api *transport,
1066 struct se_subsystem_dev *se_dev,
1067 u32 device_flags,
1068 void *transport_dev,
1069 struct se_dev_limits *dev_limits,
1070 const char *inquiry_prod,
1071 const char *inquiry_rev)
1072 {
1073 int force_pt;
1074 struct se_device *dev;
1075
1076 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1077 if (!dev) {
1078 pr_err("Unable to allocate memory for se_dev_t\n");
1079 return NULL;
1080 }
1081
1082 dev->dev_flags = device_flags;
1083 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1084 dev->dev_ptr = transport_dev;
1085 dev->se_hba = hba;
1086 dev->se_sub_dev = se_dev;
1087 dev->transport = transport;
1088 INIT_LIST_HEAD(&dev->dev_list);
1089 INIT_LIST_HEAD(&dev->dev_sep_list);
1090 INIT_LIST_HEAD(&dev->dev_tmr_list);
1091 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1092 INIT_LIST_HEAD(&dev->state_list);
1093 INIT_LIST_HEAD(&dev->qf_cmd_list);
1094 spin_lock_init(&dev->execute_task_lock);
1095 spin_lock_init(&dev->delayed_cmd_lock);
1096 spin_lock_init(&dev->dev_reservation_lock);
1097 spin_lock_init(&dev->dev_status_lock);
1098 spin_lock_init(&dev->se_port_lock);
1099 spin_lock_init(&dev->se_tmr_lock);
1100 spin_lock_init(&dev->qf_cmd_lock);
1101 atomic_set(&dev->dev_ordered_id, 0);
1102
1103 se_dev_set_default_attribs(dev, dev_limits);
1104
1105 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1106 dev->creation_time = get_jiffies_64();
1107 spin_lock_init(&dev->stats_lock);
1108
1109 spin_lock(&hba->device_lock);
1110 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1111 hba->dev_count++;
1112 spin_unlock(&hba->device_lock);
1113 /*
1114 * Setup the SAM Task Attribute emulation for struct se_device
1115 */
1116 core_setup_task_attr_emulation(dev);
1117 /*
1118 * Force PR and ALUA passthrough emulation with internal object use.
1119 */
1120 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1121 /*
1122 * Setup the Reservations infrastructure for struct se_device
1123 */
1124 core_setup_reservations(dev, force_pt);
1125 /*
1126 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1127 */
1128 if (core_setup_alua(dev, force_pt) < 0)
1129 goto err_dev_list;
1130
1131 /*
1132 * Startup the struct se_device processing thread
1133 */
1134 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1135 dev->transport->name);
1136 if (!dev->tmr_wq) {
1137 pr_err("Unable to create tmr workqueue for %s\n",
1138 dev->transport->name);
1139 goto err_dev_list;
1140 }
1141 /*
1142 * Setup work_queue for QUEUE_FULL
1143 */
1144 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1145 /*
1146 * Preload the initial INQUIRY const values if we are doing
1147 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1148 * passthrough because this is being provided by the backend LLD.
1149 * This is required so that transport_get_inquiry() copies these
1150 * originals once back into DEV_T10_WWN(dev) for the virtual device
1151 * setup.
1152 */
1153 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1154 if (!inquiry_prod || !inquiry_rev) {
1155 pr_err("All non TCM/pSCSI plugins require"
1156 " INQUIRY consts\n");
1157 goto err_wq;
1158 }
1159
1160 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1161 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1162 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1163 }
1164 scsi_dump_inquiry(dev);
1165
1166 return dev;
1167
1168 err_wq:
1169 destroy_workqueue(dev->tmr_wq);
1170 err_dev_list:
1171 spin_lock(&hba->device_lock);
1172 list_del(&dev->dev_list);
1173 hba->dev_count--;
1174 spin_unlock(&hba->device_lock);
1175
1176 se_release_vpd_for_dev(dev);
1177
1178 kfree(dev);
1179
1180 return NULL;
1181 }
1182 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1183
1184 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1185 {
1186 struct se_device *dev = cmd->se_dev;
1187
1188 if (cmd->unknown_data_length) {
1189 cmd->data_length = size;
1190 } else if (size != cmd->data_length) {
1191 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1192 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1193 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1194 cmd->data_length, size, cmd->t_task_cdb[0]);
1195
1196 if (cmd->data_direction == DMA_TO_DEVICE) {
1197 pr_err("Rejecting underflow/overflow"
1198 " WRITE data\n");
1199 goto out_invalid_cdb_field;
1200 }
1201 /*
1202 * Reject READ_* or WRITE_* with overflow/underflow for
1203 * type SCF_SCSI_DATA_CDB.
1204 */
1205 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
1206 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1207 " CDB on non 512-byte sector setup subsystem"
1208 " plugin: %s\n", dev->transport->name);
1209 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1210 goto out_invalid_cdb_field;
1211 }
1212 /*
1213 * For the overflow case keep the existing fabric provided
1214 * ->data_length. Otherwise for the underflow case, reset
1215 * ->data_length to the smaller SCSI expected data transfer
1216 * length.
1217 */
1218 if (size > cmd->data_length) {
1219 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1220 cmd->residual_count = (size - cmd->data_length);
1221 } else {
1222 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1223 cmd->residual_count = (cmd->data_length - size);
1224 cmd->data_length = size;
1225 }
1226 }
1227
1228 return 0;
1229
1230 out_invalid_cdb_field:
1231 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1232 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1233 return -EINVAL;
1234 }
1235
1236 /*
1237 * Used by fabric modules containing a local struct se_cmd within their
1238 * fabric dependent per I/O descriptor.
1239 */
1240 void transport_init_se_cmd(
1241 struct se_cmd *cmd,
1242 struct target_core_fabric_ops *tfo,
1243 struct se_session *se_sess,
1244 u32 data_length,
1245 int data_direction,
1246 int task_attr,
1247 unsigned char *sense_buffer)
1248 {
1249 INIT_LIST_HEAD(&cmd->se_lun_node);
1250 INIT_LIST_HEAD(&cmd->se_delayed_node);
1251 INIT_LIST_HEAD(&cmd->se_qf_node);
1252 INIT_LIST_HEAD(&cmd->se_cmd_list);
1253 INIT_LIST_HEAD(&cmd->state_list);
1254 init_completion(&cmd->transport_lun_fe_stop_comp);
1255 init_completion(&cmd->transport_lun_stop_comp);
1256 init_completion(&cmd->t_transport_stop_comp);
1257 init_completion(&cmd->cmd_wait_comp);
1258 init_completion(&cmd->task_stop_comp);
1259 spin_lock_init(&cmd->t_state_lock);
1260 cmd->transport_state = CMD_T_DEV_ACTIVE;
1261
1262 cmd->se_tfo = tfo;
1263 cmd->se_sess = se_sess;
1264 cmd->data_length = data_length;
1265 cmd->data_direction = data_direction;
1266 cmd->sam_task_attr = task_attr;
1267 cmd->sense_buffer = sense_buffer;
1268
1269 cmd->state_active = false;
1270 }
1271 EXPORT_SYMBOL(transport_init_se_cmd);
1272
1273 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1274 {
1275 /*
1276 * Check if SAM Task Attribute emulation is enabled for this
1277 * struct se_device storage object
1278 */
1279 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1280 return 0;
1281
1282 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1283 pr_debug("SAM Task Attribute ACA"
1284 " emulation is not supported\n");
1285 return -EINVAL;
1286 }
1287 /*
1288 * Used to determine when ORDERED commands should go from
1289 * Dormant to Active status.
1290 */
1291 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1292 smp_mb__after_atomic_inc();
1293 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1294 cmd->se_ordered_id, cmd->sam_task_attr,
1295 cmd->se_dev->transport->name);
1296 return 0;
1297 }
1298
1299 /* target_setup_cmd_from_cdb():
1300 *
1301 * Called from fabric RX Thread.
1302 */
1303 int target_setup_cmd_from_cdb(
1304 struct se_cmd *cmd,
1305 unsigned char *cdb)
1306 {
1307 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1308 u32 pr_reg_type = 0;
1309 u8 alua_ascq = 0;
1310 unsigned long flags;
1311 int ret;
1312
1313 /*
1314 * Ensure that the received CDB is less than the max (252 + 8) bytes
1315 * for VARIABLE_LENGTH_CMD
1316 */
1317 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1318 pr_err("Received SCSI CDB with command_size: %d that"
1319 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1320 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1321 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1322 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1323 return -EINVAL;
1324 }
1325 /*
1326 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1327 * allocate the additional extended CDB buffer now.. Otherwise
1328 * setup the pointer from __t_task_cdb to t_task_cdb.
1329 */
1330 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1331 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1332 GFP_KERNEL);
1333 if (!cmd->t_task_cdb) {
1334 pr_err("Unable to allocate cmd->t_task_cdb"
1335 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1336 scsi_command_size(cdb),
1337 (unsigned long)sizeof(cmd->__t_task_cdb));
1338 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1339 cmd->scsi_sense_reason =
1340 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1341 return -ENOMEM;
1342 }
1343 } else
1344 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1345 /*
1346 * Copy the original CDB into cmd->
1347 */
1348 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1349
1350 /*
1351 * Check for an existing UNIT ATTENTION condition
1352 */
1353 if (core_scsi3_ua_check(cmd, cdb) < 0) {
1354 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1355 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1356 return -EINVAL;
1357 }
1358
1359 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1360 if (ret != 0) {
1361 /*
1362 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1363 * The ALUA additional sense code qualifier (ASCQ) is determined
1364 * by the ALUA primary or secondary access state..
1365 */
1366 if (ret > 0) {
1367 pr_debug("[%s]: ALUA TG Port not available, "
1368 "SenseKey: NOT_READY, ASC/ASCQ: "
1369 "0x04/0x%02x\n",
1370 cmd->se_tfo->get_fabric_name(), alua_ascq);
1371
1372 transport_set_sense_codes(cmd, 0x04, alua_ascq);
1373 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1374 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1375 return -EINVAL;
1376 }
1377 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1378 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1379 return -EINVAL;
1380 }
1381
1382 /*
1383 * Check status for SPC-3 Persistent Reservations
1384 */
1385 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1386 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1387 cmd, cdb, pr_reg_type) != 0) {
1388 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1389 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1390 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1391 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1392 return -EBUSY;
1393 }
1394 /*
1395 * This means the CDB is allowed for the SCSI Initiator port
1396 * when said port is *NOT* holding the legacy SPC-2 or
1397 * SPC-3 Persistent Reservation.
1398 */
1399 }
1400
1401 ret = cmd->se_dev->transport->parse_cdb(cmd);
1402 if (ret < 0)
1403 return ret;
1404
1405 spin_lock_irqsave(&cmd->t_state_lock, flags);
1406 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1407 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1408
1409 /*
1410 * Check for SAM Task Attribute Emulation
1411 */
1412 if (transport_check_alloc_task_attr(cmd) < 0) {
1413 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1414 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1415 return -EINVAL;
1416 }
1417 spin_lock(&cmd->se_lun->lun_sep_lock);
1418 if (cmd->se_lun->lun_sep)
1419 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1420 spin_unlock(&cmd->se_lun->lun_sep_lock);
1421 return 0;
1422 }
1423 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1424
1425 /*
1426 * Used by fabric module frontends to queue tasks directly.
1427 * Many only be used from process context only
1428 */
1429 int transport_handle_cdb_direct(
1430 struct se_cmd *cmd)
1431 {
1432 int ret;
1433
1434 if (!cmd->se_lun) {
1435 dump_stack();
1436 pr_err("cmd->se_lun is NULL\n");
1437 return -EINVAL;
1438 }
1439 if (in_interrupt()) {
1440 dump_stack();
1441 pr_err("transport_generic_handle_cdb cannot be called"
1442 " from interrupt context\n");
1443 return -EINVAL;
1444 }
1445 /*
1446 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1447 * outstanding descriptors are handled correctly during shutdown via
1448 * transport_wait_for_tasks()
1449 *
1450 * Also, we don't take cmd->t_state_lock here as we only expect
1451 * this to be called for initial descriptor submission.
1452 */
1453 cmd->t_state = TRANSPORT_NEW_CMD;
1454 cmd->transport_state |= CMD_T_ACTIVE;
1455
1456 /*
1457 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1458 * so follow TRANSPORT_NEW_CMD processing thread context usage
1459 * and call transport_generic_request_failure() if necessary..
1460 */
1461 ret = transport_generic_new_cmd(cmd);
1462 if (ret < 0)
1463 transport_generic_request_failure(cmd);
1464
1465 return 0;
1466 }
1467 EXPORT_SYMBOL(transport_handle_cdb_direct);
1468
1469 /**
1470 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1471 *
1472 * @se_cmd: command descriptor to submit
1473 * @se_sess: associated se_sess for endpoint
1474 * @cdb: pointer to SCSI CDB
1475 * @sense: pointer to SCSI sense buffer
1476 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1477 * @data_length: fabric expected data transfer length
1478 * @task_addr: SAM task attribute
1479 * @data_dir: DMA data direction
1480 * @flags: flags for command submission from target_sc_flags_tables
1481 *
1482 * Returns non zero to signal active I/O shutdown failure. All other
1483 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1484 * but still return zero here.
1485 *
1486 * This may only be called from process context, and also currently
1487 * assumes internal allocation of fabric payload buffer by target-core.
1488 **/
1489 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1490 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1491 u32 data_length, int task_attr, int data_dir, int flags)
1492 {
1493 struct se_portal_group *se_tpg;
1494 int rc;
1495
1496 se_tpg = se_sess->se_tpg;
1497 BUG_ON(!se_tpg);
1498 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1499 BUG_ON(in_interrupt());
1500 /*
1501 * Initialize se_cmd for target operation. From this point
1502 * exceptions are handled by sending exception status via
1503 * target_core_fabric_ops->queue_status() callback
1504 */
1505 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1506 data_length, data_dir, task_attr, sense);
1507 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1508 se_cmd->unknown_data_length = 1;
1509 /*
1510 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1511 * se_sess->sess_cmd_list. A second kref_get here is necessary
1512 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1513 * kref_put() to happen during fabric packet acknowledgement.
1514 */
1515 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1516 if (rc)
1517 return rc;
1518 /*
1519 * Signal bidirectional data payloads to target-core
1520 */
1521 if (flags & TARGET_SCF_BIDI_OP)
1522 se_cmd->se_cmd_flags |= SCF_BIDI;
1523 /*
1524 * Locate se_lun pointer and attach it to struct se_cmd
1525 */
1526 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1527 transport_send_check_condition_and_sense(se_cmd,
1528 se_cmd->scsi_sense_reason, 0);
1529 target_put_sess_cmd(se_sess, se_cmd);
1530 return 0;
1531 }
1532
1533 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1534 if (rc != 0) {
1535 transport_generic_request_failure(se_cmd);
1536 return 0;
1537 }
1538
1539 /*
1540 * Check if we need to delay processing because of ALUA
1541 * Active/NonOptimized primary access state..
1542 */
1543 core_alua_check_nonop_delay(se_cmd);
1544
1545 transport_handle_cdb_direct(se_cmd);
1546 return 0;
1547 }
1548 EXPORT_SYMBOL(target_submit_cmd);
1549
1550 static void target_complete_tmr_failure(struct work_struct *work)
1551 {
1552 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1553
1554 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1555 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1556 transport_generic_free_cmd(se_cmd, 0);
1557 }
1558
1559 /**
1560 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1561 * for TMR CDBs
1562 *
1563 * @se_cmd: command descriptor to submit
1564 * @se_sess: associated se_sess for endpoint
1565 * @sense: pointer to SCSI sense buffer
1566 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1567 * @fabric_context: fabric context for TMR req
1568 * @tm_type: Type of TM request
1569 * @gfp: gfp type for caller
1570 * @tag: referenced task tag for TMR_ABORT_TASK
1571 * @flags: submit cmd flags
1572 *
1573 * Callable from all contexts.
1574 **/
1575
1576 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1577 unsigned char *sense, u32 unpacked_lun,
1578 void *fabric_tmr_ptr, unsigned char tm_type,
1579 gfp_t gfp, unsigned int tag, int flags)
1580 {
1581 struct se_portal_group *se_tpg;
1582 int ret;
1583
1584 se_tpg = se_sess->se_tpg;
1585 BUG_ON(!se_tpg);
1586
1587 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1588 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1589 /*
1590 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1591 * allocation failure.
1592 */
1593 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1594 if (ret < 0)
1595 return -ENOMEM;
1596
1597 if (tm_type == TMR_ABORT_TASK)
1598 se_cmd->se_tmr_req->ref_task_tag = tag;
1599
1600 /* See target_submit_cmd for commentary */
1601 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1602 if (ret) {
1603 core_tmr_release_req(se_cmd->se_tmr_req);
1604 return ret;
1605 }
1606
1607 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1608 if (ret) {
1609 /*
1610 * For callback during failure handling, push this work off
1611 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1612 */
1613 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1614 schedule_work(&se_cmd->work);
1615 return 0;
1616 }
1617 transport_generic_handle_tmr(se_cmd);
1618 return 0;
1619 }
1620 EXPORT_SYMBOL(target_submit_tmr);
1621
1622 /*
1623 * If the cmd is active, request it to be stopped and sleep until it
1624 * has completed.
1625 */
1626 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1627 {
1628 bool was_active = false;
1629
1630 if (cmd->transport_state & CMD_T_BUSY) {
1631 cmd->transport_state |= CMD_T_REQUEST_STOP;
1632 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1633
1634 pr_debug("cmd %p waiting to complete\n", cmd);
1635 wait_for_completion(&cmd->task_stop_comp);
1636 pr_debug("cmd %p stopped successfully\n", cmd);
1637
1638 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1639 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1640 cmd->transport_state &= ~CMD_T_BUSY;
1641 was_active = true;
1642 }
1643
1644 return was_active;
1645 }
1646
1647 /*
1648 * Handle SAM-esque emulation for generic transport request failures.
1649 */
1650 void transport_generic_request_failure(struct se_cmd *cmd)
1651 {
1652 int ret = 0;
1653
1654 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1655 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1656 cmd->t_task_cdb[0]);
1657 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1658 cmd->se_tfo->get_cmd_state(cmd),
1659 cmd->t_state, cmd->scsi_sense_reason);
1660 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1661 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1662 (cmd->transport_state & CMD_T_STOP) != 0,
1663 (cmd->transport_state & CMD_T_SENT) != 0);
1664
1665 /*
1666 * For SAM Task Attribute emulation for failed struct se_cmd
1667 */
1668 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1669 transport_complete_task_attr(cmd);
1670
1671 switch (cmd->scsi_sense_reason) {
1672 case TCM_NON_EXISTENT_LUN:
1673 case TCM_UNSUPPORTED_SCSI_OPCODE:
1674 case TCM_INVALID_CDB_FIELD:
1675 case TCM_INVALID_PARAMETER_LIST:
1676 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1677 case TCM_UNKNOWN_MODE_PAGE:
1678 case TCM_WRITE_PROTECTED:
1679 case TCM_ADDRESS_OUT_OF_RANGE:
1680 case TCM_CHECK_CONDITION_ABORT_CMD:
1681 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1682 case TCM_CHECK_CONDITION_NOT_READY:
1683 break;
1684 case TCM_RESERVATION_CONFLICT:
1685 /*
1686 * No SENSE Data payload for this case, set SCSI Status
1687 * and queue the response to $FABRIC_MOD.
1688 *
1689 * Uses linux/include/scsi/scsi.h SAM status codes defs
1690 */
1691 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1692 /*
1693 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1694 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1695 * CONFLICT STATUS.
1696 *
1697 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1698 */
1699 if (cmd->se_sess &&
1700 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1701 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1702 cmd->orig_fe_lun, 0x2C,
1703 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1704
1705 ret = cmd->se_tfo->queue_status(cmd);
1706 if (ret == -EAGAIN || ret == -ENOMEM)
1707 goto queue_full;
1708 goto check_stop;
1709 default:
1710 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1711 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1712 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1713 break;
1714 }
1715
1716 ret = transport_send_check_condition_and_sense(cmd,
1717 cmd->scsi_sense_reason, 0);
1718 if (ret == -EAGAIN || ret == -ENOMEM)
1719 goto queue_full;
1720
1721 check_stop:
1722 transport_lun_remove_cmd(cmd);
1723 if (!transport_cmd_check_stop_to_fabric(cmd))
1724 ;
1725 return;
1726
1727 queue_full:
1728 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1729 transport_handle_queue_full(cmd, cmd->se_dev);
1730 }
1731 EXPORT_SYMBOL(transport_generic_request_failure);
1732
1733 static void __target_execute_cmd(struct se_cmd *cmd)
1734 {
1735 int error = 0;
1736
1737 spin_lock_irq(&cmd->t_state_lock);
1738 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1739 spin_unlock_irq(&cmd->t_state_lock);
1740
1741 if (cmd->execute_cmd)
1742 error = cmd->execute_cmd(cmd);
1743
1744 if (error) {
1745 spin_lock_irq(&cmd->t_state_lock);
1746 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1747 spin_unlock_irq(&cmd->t_state_lock);
1748
1749 transport_generic_request_failure(cmd);
1750 }
1751 }
1752
1753 void target_execute_cmd(struct se_cmd *cmd)
1754 {
1755 struct se_device *dev = cmd->se_dev;
1756
1757 /*
1758 * If the received CDB has aleady been aborted stop processing it here.
1759 */
1760 if (transport_check_aborted_status(cmd, 1))
1761 return;
1762
1763 /*
1764 * Determine if IOCTL context caller in requesting the stopping of this
1765 * command for LUN shutdown purposes.
1766 */
1767 spin_lock_irq(&cmd->t_state_lock);
1768 if (cmd->transport_state & CMD_T_LUN_STOP) {
1769 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1770 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1771
1772 cmd->transport_state &= ~CMD_T_ACTIVE;
1773 spin_unlock_irq(&cmd->t_state_lock);
1774 complete(&cmd->transport_lun_stop_comp);
1775 return;
1776 }
1777 /*
1778 * Determine if frontend context caller is requesting the stopping of
1779 * this command for frontend exceptions.
1780 */
1781 if (cmd->transport_state & CMD_T_STOP) {
1782 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1783 __func__, __LINE__,
1784 cmd->se_tfo->get_task_tag(cmd));
1785
1786 spin_unlock_irq(&cmd->t_state_lock);
1787 complete(&cmd->t_transport_stop_comp);
1788 return;
1789 }
1790
1791 cmd->t_state = TRANSPORT_PROCESSING;
1792 spin_unlock_irq(&cmd->t_state_lock);
1793
1794 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1795 goto execute;
1796
1797 /*
1798 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1799 * to allow the passed struct se_cmd list of tasks to the front of the list.
1800 */
1801 switch (cmd->sam_task_attr) {
1802 case MSG_HEAD_TAG:
1803 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1804 "se_ordered_id: %u\n",
1805 cmd->t_task_cdb[0], cmd->se_ordered_id);
1806 goto execute;
1807 case MSG_ORDERED_TAG:
1808 atomic_inc(&dev->dev_ordered_sync);
1809 smp_mb__after_atomic_inc();
1810
1811 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1812 " se_ordered_id: %u\n",
1813 cmd->t_task_cdb[0], cmd->se_ordered_id);
1814
1815 /*
1816 * Execute an ORDERED command if no other older commands
1817 * exist that need to be completed first.
1818 */
1819 if (!atomic_read(&dev->simple_cmds))
1820 goto execute;
1821 break;
1822 default:
1823 /*
1824 * For SIMPLE and UNTAGGED Task Attribute commands
1825 */
1826 atomic_inc(&dev->simple_cmds);
1827 smp_mb__after_atomic_inc();
1828 break;
1829 }
1830
1831 if (atomic_read(&dev->dev_ordered_sync) != 0) {
1832 spin_lock(&dev->delayed_cmd_lock);
1833 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1834 spin_unlock(&dev->delayed_cmd_lock);
1835
1836 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1837 " delayed CMD list, se_ordered_id: %u\n",
1838 cmd->t_task_cdb[0], cmd->sam_task_attr,
1839 cmd->se_ordered_id);
1840 return;
1841 }
1842
1843 execute:
1844 /*
1845 * Otherwise, no ORDERED task attributes exist..
1846 */
1847 __target_execute_cmd(cmd);
1848 }
1849 EXPORT_SYMBOL(target_execute_cmd);
1850
1851 /*
1852 * Process all commands up to the last received ORDERED task attribute which
1853 * requires another blocking boundary
1854 */
1855 static void target_restart_delayed_cmds(struct se_device *dev)
1856 {
1857 for (;;) {
1858 struct se_cmd *cmd;
1859
1860 spin_lock(&dev->delayed_cmd_lock);
1861 if (list_empty(&dev->delayed_cmd_list)) {
1862 spin_unlock(&dev->delayed_cmd_lock);
1863 break;
1864 }
1865
1866 cmd = list_entry(dev->delayed_cmd_list.next,
1867 struct se_cmd, se_delayed_node);
1868 list_del(&cmd->se_delayed_node);
1869 spin_unlock(&dev->delayed_cmd_lock);
1870
1871 __target_execute_cmd(cmd);
1872
1873 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1874 break;
1875 }
1876 }
1877
1878 /*
1879 * Called from I/O completion to determine which dormant/delayed
1880 * and ordered cmds need to have their tasks added to the execution queue.
1881 */
1882 static void transport_complete_task_attr(struct se_cmd *cmd)
1883 {
1884 struct se_device *dev = cmd->se_dev;
1885
1886 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1887 atomic_dec(&dev->simple_cmds);
1888 smp_mb__after_atomic_dec();
1889 dev->dev_cur_ordered_id++;
1890 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1891 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1892 cmd->se_ordered_id);
1893 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1894 dev->dev_cur_ordered_id++;
1895 pr_debug("Incremented dev_cur_ordered_id: %u for"
1896 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1897 cmd->se_ordered_id);
1898 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1899 atomic_dec(&dev->dev_ordered_sync);
1900 smp_mb__after_atomic_dec();
1901
1902 dev->dev_cur_ordered_id++;
1903 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1904 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1905 }
1906
1907 target_restart_delayed_cmds(dev);
1908 }
1909
1910 static void transport_complete_qf(struct se_cmd *cmd)
1911 {
1912 int ret = 0;
1913
1914 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1915 transport_complete_task_attr(cmd);
1916
1917 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1918 ret = cmd->se_tfo->queue_status(cmd);
1919 if (ret)
1920 goto out;
1921 }
1922
1923 switch (cmd->data_direction) {
1924 case DMA_FROM_DEVICE:
1925 ret = cmd->se_tfo->queue_data_in(cmd);
1926 break;
1927 case DMA_TO_DEVICE:
1928 if (cmd->t_bidi_data_sg) {
1929 ret = cmd->se_tfo->queue_data_in(cmd);
1930 if (ret < 0)
1931 break;
1932 }
1933 /* Fall through for DMA_TO_DEVICE */
1934 case DMA_NONE:
1935 ret = cmd->se_tfo->queue_status(cmd);
1936 break;
1937 default:
1938 break;
1939 }
1940
1941 out:
1942 if (ret < 0) {
1943 transport_handle_queue_full(cmd, cmd->se_dev);
1944 return;
1945 }
1946 transport_lun_remove_cmd(cmd);
1947 transport_cmd_check_stop_to_fabric(cmd);
1948 }
1949
1950 static void transport_handle_queue_full(
1951 struct se_cmd *cmd,
1952 struct se_device *dev)
1953 {
1954 spin_lock_irq(&dev->qf_cmd_lock);
1955 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1956 atomic_inc(&dev->dev_qf_count);
1957 smp_mb__after_atomic_inc();
1958 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1959
1960 schedule_work(&cmd->se_dev->qf_work_queue);
1961 }
1962
1963 static void target_complete_ok_work(struct work_struct *work)
1964 {
1965 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1966 int ret;
1967
1968 /*
1969 * Check if we need to move delayed/dormant tasks from cmds on the
1970 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1971 * Attribute.
1972 */
1973 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1974 transport_complete_task_attr(cmd);
1975 /*
1976 * Check to schedule QUEUE_FULL work, or execute an existing
1977 * cmd->transport_qf_callback()
1978 */
1979 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1980 schedule_work(&cmd->se_dev->qf_work_queue);
1981
1982 /*
1983 * Check if we need to send a sense buffer from
1984 * the struct se_cmd in question.
1985 */
1986 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1987 WARN_ON(!cmd->scsi_status);
1988 ret = transport_send_check_condition_and_sense(
1989 cmd, 0, 1);
1990 if (ret == -EAGAIN || ret == -ENOMEM)
1991 goto queue_full;
1992
1993 transport_lun_remove_cmd(cmd);
1994 transport_cmd_check_stop_to_fabric(cmd);
1995 return;
1996 }
1997 /*
1998 * Check for a callback, used by amongst other things
1999 * XDWRITE_READ_10 emulation.
2000 */
2001 if (cmd->transport_complete_callback)
2002 cmd->transport_complete_callback(cmd);
2003
2004 switch (cmd->data_direction) {
2005 case DMA_FROM_DEVICE:
2006 spin_lock(&cmd->se_lun->lun_sep_lock);
2007 if (cmd->se_lun->lun_sep) {
2008 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2009 cmd->data_length;
2010 }
2011 spin_unlock(&cmd->se_lun->lun_sep_lock);
2012
2013 ret = cmd->se_tfo->queue_data_in(cmd);
2014 if (ret == -EAGAIN || ret == -ENOMEM)
2015 goto queue_full;
2016 break;
2017 case DMA_TO_DEVICE:
2018 spin_lock(&cmd->se_lun->lun_sep_lock);
2019 if (cmd->se_lun->lun_sep) {
2020 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2021 cmd->data_length;
2022 }
2023 spin_unlock(&cmd->se_lun->lun_sep_lock);
2024 /*
2025 * Check if we need to send READ payload for BIDI-COMMAND
2026 */
2027 if (cmd->t_bidi_data_sg) {
2028 spin_lock(&cmd->se_lun->lun_sep_lock);
2029 if (cmd->se_lun->lun_sep) {
2030 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2031 cmd->data_length;
2032 }
2033 spin_unlock(&cmd->se_lun->lun_sep_lock);
2034 ret = cmd->se_tfo->queue_data_in(cmd);
2035 if (ret == -EAGAIN || ret == -ENOMEM)
2036 goto queue_full;
2037 break;
2038 }
2039 /* Fall through for DMA_TO_DEVICE */
2040 case DMA_NONE:
2041 ret = cmd->se_tfo->queue_status(cmd);
2042 if (ret == -EAGAIN || ret == -ENOMEM)
2043 goto queue_full;
2044 break;
2045 default:
2046 break;
2047 }
2048
2049 transport_lun_remove_cmd(cmd);
2050 transport_cmd_check_stop_to_fabric(cmd);
2051 return;
2052
2053 queue_full:
2054 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2055 " data_direction: %d\n", cmd, cmd->data_direction);
2056 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2057 transport_handle_queue_full(cmd, cmd->se_dev);
2058 }
2059
2060 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2061 {
2062 struct scatterlist *sg;
2063 int count;
2064
2065 for_each_sg(sgl, sg, nents, count)
2066 __free_page(sg_page(sg));
2067
2068 kfree(sgl);
2069 }
2070
2071 static inline void transport_free_pages(struct se_cmd *cmd)
2072 {
2073 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2074 return;
2075
2076 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2077 cmd->t_data_sg = NULL;
2078 cmd->t_data_nents = 0;
2079
2080 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2081 cmd->t_bidi_data_sg = NULL;
2082 cmd->t_bidi_data_nents = 0;
2083 }
2084
2085 /**
2086 * transport_release_cmd - free a command
2087 * @cmd: command to free
2088 *
2089 * This routine unconditionally frees a command, and reference counting
2090 * or list removal must be done in the caller.
2091 */
2092 static void transport_release_cmd(struct se_cmd *cmd)
2093 {
2094 BUG_ON(!cmd->se_tfo);
2095
2096 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2097 core_tmr_release_req(cmd->se_tmr_req);
2098 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2099 kfree(cmd->t_task_cdb);
2100 /*
2101 * If this cmd has been setup with target_get_sess_cmd(), drop
2102 * the kref and call ->release_cmd() in kref callback.
2103 */
2104 if (cmd->check_release != 0) {
2105 target_put_sess_cmd(cmd->se_sess, cmd);
2106 return;
2107 }
2108 cmd->se_tfo->release_cmd(cmd);
2109 }
2110
2111 /**
2112 * transport_put_cmd - release a reference to a command
2113 * @cmd: command to release
2114 *
2115 * This routine releases our reference to the command and frees it if possible.
2116 */
2117 static void transport_put_cmd(struct se_cmd *cmd)
2118 {
2119 unsigned long flags;
2120
2121 spin_lock_irqsave(&cmd->t_state_lock, flags);
2122 if (atomic_read(&cmd->t_fe_count)) {
2123 if (!atomic_dec_and_test(&cmd->t_fe_count))
2124 goto out_busy;
2125 }
2126
2127 if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2128 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2129 target_remove_from_state_list(cmd);
2130 }
2131 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2132
2133 transport_free_pages(cmd);
2134 transport_release_cmd(cmd);
2135 return;
2136 out_busy:
2137 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2138 }
2139
2140 /*
2141 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2142 * allocating in the core.
2143 * @cmd: Associated se_cmd descriptor
2144 * @mem: SGL style memory for TCM WRITE / READ
2145 * @sg_mem_num: Number of SGL elements
2146 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2147 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2148 *
2149 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2150 * of parameters.
2151 */
2152 int transport_generic_map_mem_to_cmd(
2153 struct se_cmd *cmd,
2154 struct scatterlist *sgl,
2155 u32 sgl_count,
2156 struct scatterlist *sgl_bidi,
2157 u32 sgl_bidi_count)
2158 {
2159 if (!sgl || !sgl_count)
2160 return 0;
2161
2162 /*
2163 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2164 * scatterlists already have been set to follow what the fabric
2165 * passes for the original expected data transfer length.
2166 */
2167 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2168 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2169 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2170 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2171 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2172 return -EINVAL;
2173 }
2174
2175 cmd->t_data_sg = sgl;
2176 cmd->t_data_nents = sgl_count;
2177
2178 if (sgl_bidi && sgl_bidi_count) {
2179 cmd->t_bidi_data_sg = sgl_bidi;
2180 cmd->t_bidi_data_nents = sgl_bidi_count;
2181 }
2182 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2183 return 0;
2184 }
2185 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2186
2187 void *transport_kmap_data_sg(struct se_cmd *cmd)
2188 {
2189 struct scatterlist *sg = cmd->t_data_sg;
2190 struct page **pages;
2191 int i;
2192
2193 /*
2194 * We need to take into account a possible offset here for fabrics like
2195 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2196 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2197 */
2198 if (!cmd->t_data_nents)
2199 return NULL;
2200
2201 BUG_ON(!sg);
2202 if (cmd->t_data_nents == 1)
2203 return kmap(sg_page(sg)) + sg->offset;
2204
2205 /* >1 page. use vmap */
2206 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2207 if (!pages) {
2208 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2209 return NULL;
2210 }
2211
2212 /* convert sg[] to pages[] */
2213 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2214 pages[i] = sg_page(sg);
2215 }
2216
2217 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2218 kfree(pages);
2219 if (!cmd->t_data_vmap) {
2220 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2221 return NULL;
2222 }
2223
2224 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2225 }
2226 EXPORT_SYMBOL(transport_kmap_data_sg);
2227
2228 void transport_kunmap_data_sg(struct se_cmd *cmd)
2229 {
2230 if (!cmd->t_data_nents) {
2231 return;
2232 } else if (cmd->t_data_nents == 1) {
2233 kunmap(sg_page(cmd->t_data_sg));
2234 return;
2235 }
2236
2237 vunmap(cmd->t_data_vmap);
2238 cmd->t_data_vmap = NULL;
2239 }
2240 EXPORT_SYMBOL(transport_kunmap_data_sg);
2241
2242 static int
2243 transport_generic_get_mem(struct se_cmd *cmd)
2244 {
2245 u32 length = cmd->data_length;
2246 unsigned int nents;
2247 struct page *page;
2248 gfp_t zero_flag;
2249 int i = 0;
2250
2251 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2252 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2253 if (!cmd->t_data_sg)
2254 return -ENOMEM;
2255
2256 cmd->t_data_nents = nents;
2257 sg_init_table(cmd->t_data_sg, nents);
2258
2259 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2260
2261 while (length) {
2262 u32 page_len = min_t(u32, length, PAGE_SIZE);
2263 page = alloc_page(GFP_KERNEL | zero_flag);
2264 if (!page)
2265 goto out;
2266
2267 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2268 length -= page_len;
2269 i++;
2270 }
2271 return 0;
2272
2273 out:
2274 while (i > 0) {
2275 i--;
2276 __free_page(sg_page(&cmd->t_data_sg[i]));
2277 }
2278 kfree(cmd->t_data_sg);
2279 cmd->t_data_sg = NULL;
2280 return -ENOMEM;
2281 }
2282
2283 /*
2284 * Allocate any required resources to execute the command. For writes we
2285 * might not have the payload yet, so notify the fabric via a call to
2286 * ->write_pending instead. Otherwise place it on the execution queue.
2287 */
2288 int transport_generic_new_cmd(struct se_cmd *cmd)
2289 {
2290 int ret = 0;
2291
2292 /*
2293 * Determine is the TCM fabric module has already allocated physical
2294 * memory, and is directly calling transport_generic_map_mem_to_cmd()
2295 * beforehand.
2296 */
2297 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2298 cmd->data_length) {
2299 ret = transport_generic_get_mem(cmd);
2300 if (ret < 0)
2301 goto out_fail;
2302 }
2303 /*
2304 * If this command doesn't have any payload and we don't have to call
2305 * into the fabric for data transfers, go ahead and complete it right
2306 * away.
2307 */
2308 if (!cmd->data_length &&
2309 cmd->t_task_cdb[0] != REQUEST_SENSE &&
2310 cmd->se_dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
2311 spin_lock_irq(&cmd->t_state_lock);
2312 cmd->t_state = TRANSPORT_COMPLETE;
2313 cmd->transport_state |= CMD_T_ACTIVE;
2314 spin_unlock_irq(&cmd->t_state_lock);
2315
2316 INIT_WORK(&cmd->work, target_complete_ok_work);
2317 queue_work(target_completion_wq, &cmd->work);
2318 return 0;
2319 }
2320
2321 atomic_inc(&cmd->t_fe_count);
2322
2323 /*
2324 * If this command is not a write we can execute it right here,
2325 * for write buffers we need to notify the fabric driver first
2326 * and let it call back once the write buffers are ready.
2327 */
2328 target_add_to_state_list(cmd);
2329 if (cmd->data_direction != DMA_TO_DEVICE) {
2330 target_execute_cmd(cmd);
2331 return 0;
2332 }
2333
2334 spin_lock_irq(&cmd->t_state_lock);
2335 cmd->t_state = TRANSPORT_WRITE_PENDING;
2336 spin_unlock_irq(&cmd->t_state_lock);
2337
2338 transport_cmd_check_stop(cmd, false);
2339
2340 ret = cmd->se_tfo->write_pending(cmd);
2341 if (ret == -EAGAIN || ret == -ENOMEM)
2342 goto queue_full;
2343
2344 if (ret < 0)
2345 return ret;
2346 return 1;
2347
2348 out_fail:
2349 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2350 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2351 return -EINVAL;
2352 queue_full:
2353 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2354 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2355 transport_handle_queue_full(cmd, cmd->se_dev);
2356 return 0;
2357 }
2358 EXPORT_SYMBOL(transport_generic_new_cmd);
2359
2360 static void transport_write_pending_qf(struct se_cmd *cmd)
2361 {
2362 int ret;
2363
2364 ret = cmd->se_tfo->write_pending(cmd);
2365 if (ret == -EAGAIN || ret == -ENOMEM) {
2366 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2367 cmd);
2368 transport_handle_queue_full(cmd, cmd->se_dev);
2369 }
2370 }
2371
2372 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2373 {
2374 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2375 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2376 transport_wait_for_tasks(cmd);
2377
2378 transport_release_cmd(cmd);
2379 } else {
2380 if (wait_for_tasks)
2381 transport_wait_for_tasks(cmd);
2382
2383 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2384
2385 if (cmd->se_lun)
2386 transport_lun_remove_cmd(cmd);
2387
2388 transport_put_cmd(cmd);
2389 }
2390 }
2391 EXPORT_SYMBOL(transport_generic_free_cmd);
2392
2393 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2394 * @se_sess: session to reference
2395 * @se_cmd: command descriptor to add
2396 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
2397 */
2398 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2399 bool ack_kref)
2400 {
2401 unsigned long flags;
2402 int ret = 0;
2403
2404 kref_init(&se_cmd->cmd_kref);
2405 /*
2406 * Add a second kref if the fabric caller is expecting to handle
2407 * fabric acknowledgement that requires two target_put_sess_cmd()
2408 * invocations before se_cmd descriptor release.
2409 */
2410 if (ack_kref == true) {
2411 kref_get(&se_cmd->cmd_kref);
2412 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2413 }
2414
2415 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2416 if (se_sess->sess_tearing_down) {
2417 ret = -ESHUTDOWN;
2418 goto out;
2419 }
2420 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2421 se_cmd->check_release = 1;
2422
2423 out:
2424 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2425 return ret;
2426 }
2427
2428 static void target_release_cmd_kref(struct kref *kref)
2429 {
2430 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2431 struct se_session *se_sess = se_cmd->se_sess;
2432 unsigned long flags;
2433
2434 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2435 if (list_empty(&se_cmd->se_cmd_list)) {
2436 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2437 se_cmd->se_tfo->release_cmd(se_cmd);
2438 return;
2439 }
2440 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2441 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2442 complete(&se_cmd->cmd_wait_comp);
2443 return;
2444 }
2445 list_del(&se_cmd->se_cmd_list);
2446 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2447
2448 se_cmd->se_tfo->release_cmd(se_cmd);
2449 }
2450
2451 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2452 * @se_sess: session to reference
2453 * @se_cmd: command descriptor to drop
2454 */
2455 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2456 {
2457 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2458 }
2459 EXPORT_SYMBOL(target_put_sess_cmd);
2460
2461 /* target_sess_cmd_list_set_waiting - Flag all commands in
2462 * sess_cmd_list to complete cmd_wait_comp. Set
2463 * sess_tearing_down so no more commands are queued.
2464 * @se_sess: session to flag
2465 */
2466 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2467 {
2468 struct se_cmd *se_cmd;
2469 unsigned long flags;
2470
2471 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2472
2473 WARN_ON(se_sess->sess_tearing_down);
2474 se_sess->sess_tearing_down = 1;
2475
2476 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2477 se_cmd->cmd_wait_set = 1;
2478
2479 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2480 }
2481 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2482
2483 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2484 * @se_sess: session to wait for active I/O
2485 * @wait_for_tasks: Make extra transport_wait_for_tasks call
2486 */
2487 void target_wait_for_sess_cmds(
2488 struct se_session *se_sess,
2489 int wait_for_tasks)
2490 {
2491 struct se_cmd *se_cmd, *tmp_cmd;
2492 bool rc = false;
2493
2494 list_for_each_entry_safe(se_cmd, tmp_cmd,
2495 &se_sess->sess_cmd_list, se_cmd_list) {
2496 list_del(&se_cmd->se_cmd_list);
2497
2498 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2499 " %d\n", se_cmd, se_cmd->t_state,
2500 se_cmd->se_tfo->get_cmd_state(se_cmd));
2501
2502 if (wait_for_tasks) {
2503 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2504 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2505 se_cmd->se_tfo->get_cmd_state(se_cmd));
2506
2507 rc = transport_wait_for_tasks(se_cmd);
2508
2509 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2510 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2511 se_cmd->se_tfo->get_cmd_state(se_cmd));
2512 }
2513
2514 if (!rc) {
2515 wait_for_completion(&se_cmd->cmd_wait_comp);
2516 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2517 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2518 se_cmd->se_tfo->get_cmd_state(se_cmd));
2519 }
2520
2521 se_cmd->se_tfo->release_cmd(se_cmd);
2522 }
2523 }
2524 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2525
2526 /* transport_lun_wait_for_tasks():
2527 *
2528 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2529 * an struct se_lun to be successfully shutdown.
2530 */
2531 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2532 {
2533 unsigned long flags;
2534 int ret = 0;
2535
2536 /*
2537 * If the frontend has already requested this struct se_cmd to
2538 * be stopped, we can safely ignore this struct se_cmd.
2539 */
2540 spin_lock_irqsave(&cmd->t_state_lock, flags);
2541 if (cmd->transport_state & CMD_T_STOP) {
2542 cmd->transport_state &= ~CMD_T_LUN_STOP;
2543
2544 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2545 cmd->se_tfo->get_task_tag(cmd));
2546 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2547 transport_cmd_check_stop(cmd, false);
2548 return -EPERM;
2549 }
2550 cmd->transport_state |= CMD_T_LUN_FE_STOP;
2551 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2552
2553 // XXX: audit task_flags checks.
2554 spin_lock_irqsave(&cmd->t_state_lock, flags);
2555 if ((cmd->transport_state & CMD_T_BUSY) &&
2556 (cmd->transport_state & CMD_T_SENT)) {
2557 if (!target_stop_cmd(cmd, &flags))
2558 ret++;
2559 }
2560 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2561
2562 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2563 " %d\n", cmd, ret);
2564 if (!ret) {
2565 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2566 cmd->se_tfo->get_task_tag(cmd));
2567 wait_for_completion(&cmd->transport_lun_stop_comp);
2568 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2569 cmd->se_tfo->get_task_tag(cmd));
2570 }
2571
2572 return 0;
2573 }
2574
2575 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2576 {
2577 struct se_cmd *cmd = NULL;
2578 unsigned long lun_flags, cmd_flags;
2579 /*
2580 * Do exception processing and return CHECK_CONDITION status to the
2581 * Initiator Port.
2582 */
2583 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2584 while (!list_empty(&lun->lun_cmd_list)) {
2585 cmd = list_first_entry(&lun->lun_cmd_list,
2586 struct se_cmd, se_lun_node);
2587 list_del_init(&cmd->se_lun_node);
2588
2589 spin_lock(&cmd->t_state_lock);
2590 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2591 "_lun_stop for ITT: 0x%08x\n",
2592 cmd->se_lun->unpacked_lun,
2593 cmd->se_tfo->get_task_tag(cmd));
2594 cmd->transport_state |= CMD_T_LUN_STOP;
2595 spin_unlock(&cmd->t_state_lock);
2596
2597 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2598
2599 if (!cmd->se_lun) {
2600 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2601 cmd->se_tfo->get_task_tag(cmd),
2602 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2603 BUG();
2604 }
2605 /*
2606 * If the Storage engine still owns the iscsi_cmd_t, determine
2607 * and/or stop its context.
2608 */
2609 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2610 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2611 cmd->se_tfo->get_task_tag(cmd));
2612
2613 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2614 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2615 continue;
2616 }
2617
2618 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2619 "_wait_for_tasks(): SUCCESS\n",
2620 cmd->se_lun->unpacked_lun,
2621 cmd->se_tfo->get_task_tag(cmd));
2622
2623 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2624 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2625 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2626 goto check_cond;
2627 }
2628 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2629 target_remove_from_state_list(cmd);
2630 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2631
2632 /*
2633 * The Storage engine stopped this struct se_cmd before it was
2634 * send to the fabric frontend for delivery back to the
2635 * Initiator Node. Return this SCSI CDB back with an
2636 * CHECK_CONDITION status.
2637 */
2638 check_cond:
2639 transport_send_check_condition_and_sense(cmd,
2640 TCM_NON_EXISTENT_LUN, 0);
2641 /*
2642 * If the fabric frontend is waiting for this iscsi_cmd_t to
2643 * be released, notify the waiting thread now that LU has
2644 * finished accessing it.
2645 */
2646 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2647 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2648 pr_debug("SE_LUN[%d] - Detected FE stop for"
2649 " struct se_cmd: %p ITT: 0x%08x\n",
2650 lun->unpacked_lun,
2651 cmd, cmd->se_tfo->get_task_tag(cmd));
2652
2653 spin_unlock_irqrestore(&cmd->t_state_lock,
2654 cmd_flags);
2655 transport_cmd_check_stop(cmd, false);
2656 complete(&cmd->transport_lun_fe_stop_comp);
2657 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2658 continue;
2659 }
2660 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2661 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2662
2663 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2664 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2665 }
2666 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2667 }
2668
2669 static int transport_clear_lun_thread(void *p)
2670 {
2671 struct se_lun *lun = p;
2672
2673 __transport_clear_lun_from_sessions(lun);
2674 complete(&lun->lun_shutdown_comp);
2675
2676 return 0;
2677 }
2678
2679 int transport_clear_lun_from_sessions(struct se_lun *lun)
2680 {
2681 struct task_struct *kt;
2682
2683 kt = kthread_run(transport_clear_lun_thread, lun,
2684 "tcm_cl_%u", lun->unpacked_lun);
2685 if (IS_ERR(kt)) {
2686 pr_err("Unable to start clear_lun thread\n");
2687 return PTR_ERR(kt);
2688 }
2689 wait_for_completion(&lun->lun_shutdown_comp);
2690
2691 return 0;
2692 }
2693
2694 /**
2695 * transport_wait_for_tasks - wait for completion to occur
2696 * @cmd: command to wait
2697 *
2698 * Called from frontend fabric context to wait for storage engine
2699 * to pause and/or release frontend generated struct se_cmd.
2700 */
2701 bool transport_wait_for_tasks(struct se_cmd *cmd)
2702 {
2703 unsigned long flags;
2704
2705 spin_lock_irqsave(&cmd->t_state_lock, flags);
2706 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2707 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2708 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2709 return false;
2710 }
2711
2712 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2713 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2715 return false;
2716 }
2717 /*
2718 * If we are already stopped due to an external event (ie: LUN shutdown)
2719 * sleep until the connection can have the passed struct se_cmd back.
2720 * The cmd->transport_lun_stopped_sem will be upped by
2721 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2722 * has completed its operation on the struct se_cmd.
2723 */
2724 if (cmd->transport_state & CMD_T_LUN_STOP) {
2725 pr_debug("wait_for_tasks: Stopping"
2726 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2727 "_stop_comp); for ITT: 0x%08x\n",
2728 cmd->se_tfo->get_task_tag(cmd));
2729 /*
2730 * There is a special case for WRITES where a FE exception +
2731 * LUN shutdown means ConfigFS context is still sleeping on
2732 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2733 * We go ahead and up transport_lun_stop_comp just to be sure
2734 * here.
2735 */
2736 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2737 complete(&cmd->transport_lun_stop_comp);
2738 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2739 spin_lock_irqsave(&cmd->t_state_lock, flags);
2740
2741 target_remove_from_state_list(cmd);
2742 /*
2743 * At this point, the frontend who was the originator of this
2744 * struct se_cmd, now owns the structure and can be released through
2745 * normal means below.
2746 */
2747 pr_debug("wait_for_tasks: Stopped"
2748 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2749 "stop_comp); for ITT: 0x%08x\n",
2750 cmd->se_tfo->get_task_tag(cmd));
2751
2752 cmd->transport_state &= ~CMD_T_LUN_STOP;
2753 }
2754
2755 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2756 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2757 return false;
2758 }
2759
2760 cmd->transport_state |= CMD_T_STOP;
2761
2762 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2763 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2764 cmd, cmd->se_tfo->get_task_tag(cmd),
2765 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2766
2767 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2768
2769 wait_for_completion(&cmd->t_transport_stop_comp);
2770
2771 spin_lock_irqsave(&cmd->t_state_lock, flags);
2772 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2773
2774 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
2775 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2776 cmd->se_tfo->get_task_tag(cmd));
2777
2778 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2779
2780 return true;
2781 }
2782 EXPORT_SYMBOL(transport_wait_for_tasks);
2783
2784 static int transport_get_sense_codes(
2785 struct se_cmd *cmd,
2786 u8 *asc,
2787 u8 *ascq)
2788 {
2789 *asc = cmd->scsi_asc;
2790 *ascq = cmd->scsi_ascq;
2791
2792 return 0;
2793 }
2794
2795 static int transport_set_sense_codes(
2796 struct se_cmd *cmd,
2797 u8 asc,
2798 u8 ascq)
2799 {
2800 cmd->scsi_asc = asc;
2801 cmd->scsi_ascq = ascq;
2802
2803 return 0;
2804 }
2805
2806 int transport_send_check_condition_and_sense(
2807 struct se_cmd *cmd,
2808 u8 reason,
2809 int from_transport)
2810 {
2811 unsigned char *buffer = cmd->sense_buffer;
2812 unsigned long flags;
2813 int offset;
2814 u8 asc = 0, ascq = 0;
2815
2816 spin_lock_irqsave(&cmd->t_state_lock, flags);
2817 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2818 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2819 return 0;
2820 }
2821 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2822 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2823
2824 if (!reason && from_transport)
2825 goto after_reason;
2826
2827 if (!from_transport)
2828 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2829 /*
2830 * Data Segment and SenseLength of the fabric response PDU.
2831 *
2832 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2833 * from include/scsi/scsi_cmnd.h
2834 */
2835 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2836 TRANSPORT_SENSE_BUFFER);
2837 /*
2838 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2839 * SENSE KEY values from include/scsi/scsi.h
2840 */
2841 switch (reason) {
2842 case TCM_NON_EXISTENT_LUN:
2843 /* CURRENT ERROR */
2844 buffer[offset] = 0x70;
2845 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2846 /* ILLEGAL REQUEST */
2847 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2848 /* LOGICAL UNIT NOT SUPPORTED */
2849 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2850 break;
2851 case TCM_UNSUPPORTED_SCSI_OPCODE:
2852 case TCM_SECTOR_COUNT_TOO_MANY:
2853 /* CURRENT ERROR */
2854 buffer[offset] = 0x70;
2855 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2856 /* ILLEGAL REQUEST */
2857 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2858 /* INVALID COMMAND OPERATION CODE */
2859 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2860 break;
2861 case TCM_UNKNOWN_MODE_PAGE:
2862 /* CURRENT ERROR */
2863 buffer[offset] = 0x70;
2864 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2865 /* ILLEGAL REQUEST */
2866 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2867 /* INVALID FIELD IN CDB */
2868 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2869 break;
2870 case TCM_CHECK_CONDITION_ABORT_CMD:
2871 /* CURRENT ERROR */
2872 buffer[offset] = 0x70;
2873 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2874 /* ABORTED COMMAND */
2875 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2876 /* BUS DEVICE RESET FUNCTION OCCURRED */
2877 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2878 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2879 break;
2880 case TCM_INCORRECT_AMOUNT_OF_DATA:
2881 /* CURRENT ERROR */
2882 buffer[offset] = 0x70;
2883 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2884 /* ABORTED COMMAND */
2885 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2886 /* WRITE ERROR */
2887 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2888 /* NOT ENOUGH UNSOLICITED DATA */
2889 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2890 break;
2891 case TCM_INVALID_CDB_FIELD:
2892 /* CURRENT ERROR */
2893 buffer[offset] = 0x70;
2894 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2895 /* ILLEGAL REQUEST */
2896 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2897 /* INVALID FIELD IN CDB */
2898 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2899 break;
2900 case TCM_INVALID_PARAMETER_LIST:
2901 /* CURRENT ERROR */
2902 buffer[offset] = 0x70;
2903 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2904 /* ILLEGAL REQUEST */
2905 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2906 /* INVALID FIELD IN PARAMETER LIST */
2907 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2908 break;
2909 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2910 /* CURRENT ERROR */
2911 buffer[offset] = 0x70;
2912 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2913 /* ABORTED COMMAND */
2914 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2915 /* WRITE ERROR */
2916 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2917 /* UNEXPECTED_UNSOLICITED_DATA */
2918 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2919 break;
2920 case TCM_SERVICE_CRC_ERROR:
2921 /* CURRENT ERROR */
2922 buffer[offset] = 0x70;
2923 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2924 /* ABORTED COMMAND */
2925 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2926 /* PROTOCOL SERVICE CRC ERROR */
2927 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2928 /* N/A */
2929 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2930 break;
2931 case TCM_SNACK_REJECTED:
2932 /* CURRENT ERROR */
2933 buffer[offset] = 0x70;
2934 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2935 /* ABORTED COMMAND */
2936 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2937 /* READ ERROR */
2938 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2939 /* FAILED RETRANSMISSION REQUEST */
2940 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2941 break;
2942 case TCM_WRITE_PROTECTED:
2943 /* CURRENT ERROR */
2944 buffer[offset] = 0x70;
2945 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2946 /* DATA PROTECT */
2947 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2948 /* WRITE PROTECTED */
2949 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2950 break;
2951 case TCM_ADDRESS_OUT_OF_RANGE:
2952 /* CURRENT ERROR */
2953 buffer[offset] = 0x70;
2954 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2955 /* ILLEGAL REQUEST */
2956 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2957 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2958 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
2959 break;
2960 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2961 /* CURRENT ERROR */
2962 buffer[offset] = 0x70;
2963 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2964 /* UNIT ATTENTION */
2965 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2966 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2967 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2968 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2969 break;
2970 case TCM_CHECK_CONDITION_NOT_READY:
2971 /* CURRENT ERROR */
2972 buffer[offset] = 0x70;
2973 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2974 /* Not Ready */
2975 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
2976 transport_get_sense_codes(cmd, &asc, &ascq);
2977 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2978 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2979 break;
2980 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2981 default:
2982 /* CURRENT ERROR */
2983 buffer[offset] = 0x70;
2984 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2985 /* ILLEGAL REQUEST */
2986 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2987 /* LOGICAL UNIT COMMUNICATION FAILURE */
2988 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
2989 break;
2990 }
2991 /*
2992 * This code uses linux/include/scsi/scsi.h SAM status codes!
2993 */
2994 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2995 /*
2996 * Automatically padded, this value is encoded in the fabric's
2997 * data_length response PDU containing the SCSI defined sense data.
2998 */
2999 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
3000
3001 after_reason:
3002 return cmd->se_tfo->queue_status(cmd);
3003 }
3004 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3005
3006 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3007 {
3008 int ret = 0;
3009
3010 if (cmd->transport_state & CMD_T_ABORTED) {
3011 if (!send_status ||
3012 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3013 return 1;
3014
3015 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3016 " status for CDB: 0x%02x ITT: 0x%08x\n",
3017 cmd->t_task_cdb[0],
3018 cmd->se_tfo->get_task_tag(cmd));
3019
3020 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3021 cmd->se_tfo->queue_status(cmd);
3022 ret = 1;
3023 }
3024 return ret;
3025 }
3026 EXPORT_SYMBOL(transport_check_aborted_status);
3027
3028 void transport_send_task_abort(struct se_cmd *cmd)
3029 {
3030 unsigned long flags;
3031
3032 spin_lock_irqsave(&cmd->t_state_lock, flags);
3033 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3034 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3035 return;
3036 }
3037 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3038
3039 /*
3040 * If there are still expected incoming fabric WRITEs, we wait
3041 * until until they have completed before sending a TASK_ABORTED
3042 * response. This response with TASK_ABORTED status will be
3043 * queued back to fabric module by transport_check_aborted_status().
3044 */
3045 if (cmd->data_direction == DMA_TO_DEVICE) {
3046 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3047 cmd->transport_state |= CMD_T_ABORTED;
3048 smp_mb__after_atomic_inc();
3049 }
3050 }
3051 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3052
3053 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3054 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3055 cmd->se_tfo->get_task_tag(cmd));
3056
3057 cmd->se_tfo->queue_status(cmd);
3058 }
3059
3060 static void target_tmr_work(struct work_struct *work)
3061 {
3062 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3063 struct se_device *dev = cmd->se_dev;
3064 struct se_tmr_req *tmr = cmd->se_tmr_req;
3065 int ret;
3066
3067 switch (tmr->function) {
3068 case TMR_ABORT_TASK:
3069 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3070 break;
3071 case TMR_ABORT_TASK_SET:
3072 case TMR_CLEAR_ACA:
3073 case TMR_CLEAR_TASK_SET:
3074 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3075 break;
3076 case TMR_LUN_RESET:
3077 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3078 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3079 TMR_FUNCTION_REJECTED;
3080 break;
3081 case TMR_TARGET_WARM_RESET:
3082 tmr->response = TMR_FUNCTION_REJECTED;
3083 break;
3084 case TMR_TARGET_COLD_RESET:
3085 tmr->response = TMR_FUNCTION_REJECTED;
3086 break;
3087 default:
3088 pr_err("Uknown TMR function: 0x%02x.\n",
3089 tmr->function);
3090 tmr->response = TMR_FUNCTION_REJECTED;
3091 break;
3092 }
3093
3094 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3095 cmd->se_tfo->queue_tm_rsp(cmd);
3096
3097 transport_cmd_check_stop_to_fabric(cmd);
3098 }
3099
3100 int transport_generic_handle_tmr(
3101 struct se_cmd *cmd)
3102 {
3103 INIT_WORK(&cmd->work, target_tmr_work);
3104 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3105 return 0;
3106 }
3107 EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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