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target: remove the task_sg_bidi field se_task and pSCSI BIDI support
[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 <asm/unaligned.h>
40 #include <net/sock.h>
41 #include <net/tcp.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_tcq.h>
45
46 #include <target/target_core_base.h>
47 #include <target/target_core_device.h>
48 #include <target/target_core_tmr.h>
49 #include <target/target_core_tpg.h>
50 #include <target/target_core_transport.h>
51 #include <target/target_core_fabric_ops.h>
52 #include <target/target_core_configfs.h>
53
54 #include "target_core_alua.h"
55 #include "target_core_hba.h"
56 #include "target_core_pr.h"
57 #include "target_core_ua.h"
58
59 static int sub_api_initialized;
60
61 static struct workqueue_struct *target_completion_wq;
62 static struct kmem_cache *se_cmd_cache;
63 static struct kmem_cache *se_sess_cache;
64 struct kmem_cache *se_tmr_req_cache;
65 struct kmem_cache *se_ua_cache;
66 struct kmem_cache *t10_pr_reg_cache;
67 struct kmem_cache *t10_alua_lu_gp_cache;
68 struct kmem_cache *t10_alua_lu_gp_mem_cache;
69 struct kmem_cache *t10_alua_tg_pt_gp_cache;
70 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
71
72 static int transport_generic_write_pending(struct se_cmd *);
73 static int transport_processing_thread(void *param);
74 static int __transport_execute_tasks(struct se_device *dev);
75 static void transport_complete_task_attr(struct se_cmd *cmd);
76 static void transport_handle_queue_full(struct se_cmd *cmd,
77 struct se_device *dev);
78 static void transport_direct_request_timeout(struct se_cmd *cmd);
79 static void transport_free_dev_tasks(struct se_cmd *cmd);
80 static u32 transport_allocate_tasks(struct se_cmd *cmd,
81 unsigned long long starting_lba,
82 enum dma_data_direction data_direction,
83 struct scatterlist *sgl, unsigned int nents);
84 static int transport_generic_get_mem(struct se_cmd *cmd);
85 static void transport_put_cmd(struct se_cmd *cmd);
86 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
87 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
88 static void transport_generic_request_failure(struct se_cmd *, int, int);
89 static void target_complete_ok_work(struct work_struct *work);
90
91 int init_se_kmem_caches(void)
92 {
93 se_cmd_cache = kmem_cache_create("se_cmd_cache",
94 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
95 if (!se_cmd_cache) {
96 pr_err("kmem_cache_create for struct se_cmd failed\n");
97 goto out;
98 }
99 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
100 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
101 0, NULL);
102 if (!se_tmr_req_cache) {
103 pr_err("kmem_cache_create() for struct se_tmr_req"
104 " failed\n");
105 goto out_free_cmd_cache;
106 }
107 se_sess_cache = kmem_cache_create("se_sess_cache",
108 sizeof(struct se_session), __alignof__(struct se_session),
109 0, NULL);
110 if (!se_sess_cache) {
111 pr_err("kmem_cache_create() for struct se_session"
112 " failed\n");
113 goto out_free_tmr_req_cache;
114 }
115 se_ua_cache = kmem_cache_create("se_ua_cache",
116 sizeof(struct se_ua), __alignof__(struct se_ua),
117 0, NULL);
118 if (!se_ua_cache) {
119 pr_err("kmem_cache_create() for struct se_ua failed\n");
120 goto out_free_sess_cache;
121 }
122 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
123 sizeof(struct t10_pr_registration),
124 __alignof__(struct t10_pr_registration), 0, NULL);
125 if (!t10_pr_reg_cache) {
126 pr_err("kmem_cache_create() for struct t10_pr_registration"
127 " failed\n");
128 goto out_free_ua_cache;
129 }
130 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
131 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
132 0, NULL);
133 if (!t10_alua_lu_gp_cache) {
134 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
135 " failed\n");
136 goto out_free_pr_reg_cache;
137 }
138 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
139 sizeof(struct t10_alua_lu_gp_member),
140 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
141 if (!t10_alua_lu_gp_mem_cache) {
142 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
143 "cache failed\n");
144 goto out_free_lu_gp_cache;
145 }
146 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
147 sizeof(struct t10_alua_tg_pt_gp),
148 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
149 if (!t10_alua_tg_pt_gp_cache) {
150 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
151 "cache failed\n");
152 goto out_free_lu_gp_mem_cache;
153 }
154 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
155 "t10_alua_tg_pt_gp_mem_cache",
156 sizeof(struct t10_alua_tg_pt_gp_member),
157 __alignof__(struct t10_alua_tg_pt_gp_member),
158 0, NULL);
159 if (!t10_alua_tg_pt_gp_mem_cache) {
160 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
161 "mem_t failed\n");
162 goto out_free_tg_pt_gp_cache;
163 }
164
165 target_completion_wq = alloc_workqueue("target_completion",
166 WQ_MEM_RECLAIM, 0);
167 if (!target_completion_wq)
168 goto out_free_tg_pt_gp_mem_cache;
169
170 return 0;
171
172 out_free_tg_pt_gp_mem_cache:
173 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
174 out_free_tg_pt_gp_cache:
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
176 out_free_lu_gp_mem_cache:
177 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
178 out_free_lu_gp_cache:
179 kmem_cache_destroy(t10_alua_lu_gp_cache);
180 out_free_pr_reg_cache:
181 kmem_cache_destroy(t10_pr_reg_cache);
182 out_free_ua_cache:
183 kmem_cache_destroy(se_ua_cache);
184 out_free_sess_cache:
185 kmem_cache_destroy(se_sess_cache);
186 out_free_tmr_req_cache:
187 kmem_cache_destroy(se_tmr_req_cache);
188 out_free_cmd_cache:
189 kmem_cache_destroy(se_cmd_cache);
190 out:
191 return -ENOMEM;
192 }
193
194 void release_se_kmem_caches(void)
195 {
196 destroy_workqueue(target_completion_wq);
197 kmem_cache_destroy(se_cmd_cache);
198 kmem_cache_destroy(se_tmr_req_cache);
199 kmem_cache_destroy(se_sess_cache);
200 kmem_cache_destroy(se_ua_cache);
201 kmem_cache_destroy(t10_pr_reg_cache);
202 kmem_cache_destroy(t10_alua_lu_gp_cache);
203 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
205 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
206 }
207
208 /* This code ensures unique mib indexes are handed out. */
209 static DEFINE_SPINLOCK(scsi_mib_index_lock);
210 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
211
212 /*
213 * Allocate a new row index for the entry type specified
214 */
215 u32 scsi_get_new_index(scsi_index_t type)
216 {
217 u32 new_index;
218
219 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
220
221 spin_lock(&scsi_mib_index_lock);
222 new_index = ++scsi_mib_index[type];
223 spin_unlock(&scsi_mib_index_lock);
224
225 return new_index;
226 }
227
228 void transport_init_queue_obj(struct se_queue_obj *qobj)
229 {
230 atomic_set(&qobj->queue_cnt, 0);
231 INIT_LIST_HEAD(&qobj->qobj_list);
232 init_waitqueue_head(&qobj->thread_wq);
233 spin_lock_init(&qobj->cmd_queue_lock);
234 }
235 EXPORT_SYMBOL(transport_init_queue_obj);
236
237 void transport_subsystem_check_init(void)
238 {
239 int ret;
240
241 if (sub_api_initialized)
242 return;
243
244 ret = request_module("target_core_iblock");
245 if (ret != 0)
246 pr_err("Unable to load target_core_iblock\n");
247
248 ret = request_module("target_core_file");
249 if (ret != 0)
250 pr_err("Unable to load target_core_file\n");
251
252 ret = request_module("target_core_pscsi");
253 if (ret != 0)
254 pr_err("Unable to load target_core_pscsi\n");
255
256 ret = request_module("target_core_stgt");
257 if (ret != 0)
258 pr_err("Unable to load target_core_stgt\n");
259
260 sub_api_initialized = 1;
261 return;
262 }
263
264 struct se_session *transport_init_session(void)
265 {
266 struct se_session *se_sess;
267
268 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
269 if (!se_sess) {
270 pr_err("Unable to allocate struct se_session from"
271 " se_sess_cache\n");
272 return ERR_PTR(-ENOMEM);
273 }
274 INIT_LIST_HEAD(&se_sess->sess_list);
275 INIT_LIST_HEAD(&se_sess->sess_acl_list);
276
277 return se_sess;
278 }
279 EXPORT_SYMBOL(transport_init_session);
280
281 /*
282 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
283 */
284 void __transport_register_session(
285 struct se_portal_group *se_tpg,
286 struct se_node_acl *se_nacl,
287 struct se_session *se_sess,
288 void *fabric_sess_ptr)
289 {
290 unsigned char buf[PR_REG_ISID_LEN];
291
292 se_sess->se_tpg = se_tpg;
293 se_sess->fabric_sess_ptr = fabric_sess_ptr;
294 /*
295 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
296 *
297 * Only set for struct se_session's that will actually be moving I/O.
298 * eg: *NOT* discovery sessions.
299 */
300 if (se_nacl) {
301 /*
302 * If the fabric module supports an ISID based TransportID,
303 * save this value in binary from the fabric I_T Nexus now.
304 */
305 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
306 memset(&buf[0], 0, PR_REG_ISID_LEN);
307 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
308 &buf[0], PR_REG_ISID_LEN);
309 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
310 }
311 spin_lock_irq(&se_nacl->nacl_sess_lock);
312 /*
313 * The se_nacl->nacl_sess pointer will be set to the
314 * last active I_T Nexus for each struct se_node_acl.
315 */
316 se_nacl->nacl_sess = se_sess;
317
318 list_add_tail(&se_sess->sess_acl_list,
319 &se_nacl->acl_sess_list);
320 spin_unlock_irq(&se_nacl->nacl_sess_lock);
321 }
322 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
323
324 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
325 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
326 }
327 EXPORT_SYMBOL(__transport_register_session);
328
329 void transport_register_session(
330 struct se_portal_group *se_tpg,
331 struct se_node_acl *se_nacl,
332 struct se_session *se_sess,
333 void *fabric_sess_ptr)
334 {
335 spin_lock_bh(&se_tpg->session_lock);
336 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
337 spin_unlock_bh(&se_tpg->session_lock);
338 }
339 EXPORT_SYMBOL(transport_register_session);
340
341 void transport_deregister_session_configfs(struct se_session *se_sess)
342 {
343 struct se_node_acl *se_nacl;
344 unsigned long flags;
345 /*
346 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
347 */
348 se_nacl = se_sess->se_node_acl;
349 if (se_nacl) {
350 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
351 list_del(&se_sess->sess_acl_list);
352 /*
353 * If the session list is empty, then clear the pointer.
354 * Otherwise, set the struct se_session pointer from the tail
355 * element of the per struct se_node_acl active session list.
356 */
357 if (list_empty(&se_nacl->acl_sess_list))
358 se_nacl->nacl_sess = NULL;
359 else {
360 se_nacl->nacl_sess = container_of(
361 se_nacl->acl_sess_list.prev,
362 struct se_session, sess_acl_list);
363 }
364 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
365 }
366 }
367 EXPORT_SYMBOL(transport_deregister_session_configfs);
368
369 void transport_free_session(struct se_session *se_sess)
370 {
371 kmem_cache_free(se_sess_cache, se_sess);
372 }
373 EXPORT_SYMBOL(transport_free_session);
374
375 void transport_deregister_session(struct se_session *se_sess)
376 {
377 struct se_portal_group *se_tpg = se_sess->se_tpg;
378 struct se_node_acl *se_nacl;
379 unsigned long flags;
380
381 if (!se_tpg) {
382 transport_free_session(se_sess);
383 return;
384 }
385
386 spin_lock_irqsave(&se_tpg->session_lock, flags);
387 list_del(&se_sess->sess_list);
388 se_sess->se_tpg = NULL;
389 se_sess->fabric_sess_ptr = NULL;
390 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
391
392 /*
393 * Determine if we need to do extra work for this initiator node's
394 * struct se_node_acl if it had been previously dynamically generated.
395 */
396 se_nacl = se_sess->se_node_acl;
397 if (se_nacl) {
398 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
399 if (se_nacl->dynamic_node_acl) {
400 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
401 se_tpg)) {
402 list_del(&se_nacl->acl_list);
403 se_tpg->num_node_acls--;
404 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
405
406 core_tpg_wait_for_nacl_pr_ref(se_nacl);
407 core_free_device_list_for_node(se_nacl, se_tpg);
408 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
409 se_nacl);
410 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
411 }
412 }
413 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
414 }
415
416 transport_free_session(se_sess);
417
418 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
419 se_tpg->se_tpg_tfo->get_fabric_name());
420 }
421 EXPORT_SYMBOL(transport_deregister_session);
422
423 /*
424 * Called with cmd->t_state_lock held.
425 */
426 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
427 {
428 struct se_device *dev = cmd->se_dev;
429 struct se_task *task;
430 unsigned long flags;
431
432 if (!dev)
433 return;
434
435 list_for_each_entry(task, &cmd->t_task_list, t_list) {
436 if (task->task_flags & TF_ACTIVE)
437 continue;
438
439 if (!atomic_read(&task->task_state_active))
440 continue;
441
442 spin_lock_irqsave(&dev->execute_task_lock, flags);
443 list_del(&task->t_state_list);
444 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
445 cmd->se_tfo->get_task_tag(cmd), dev, task);
446 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
447
448 atomic_set(&task->task_state_active, 0);
449 atomic_dec(&cmd->t_task_cdbs_ex_left);
450 }
451 }
452
453 /* transport_cmd_check_stop():
454 *
455 * 'transport_off = 1' determines if t_transport_active should be cleared.
456 * 'transport_off = 2' determines if task_dev_state should be removed.
457 *
458 * A non-zero u8 t_state sets cmd->t_state.
459 * Returns 1 when command is stopped, else 0.
460 */
461 static int transport_cmd_check_stop(
462 struct se_cmd *cmd,
463 int transport_off,
464 u8 t_state)
465 {
466 unsigned long flags;
467
468 spin_lock_irqsave(&cmd->t_state_lock, flags);
469 /*
470 * Determine if IOCTL context caller in requesting the stopping of this
471 * command for LUN shutdown purposes.
472 */
473 if (atomic_read(&cmd->transport_lun_stop)) {
474 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
475 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
476 cmd->se_tfo->get_task_tag(cmd));
477
478 atomic_set(&cmd->t_transport_active, 0);
479 if (transport_off == 2)
480 transport_all_task_dev_remove_state(cmd);
481 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
482
483 complete(&cmd->transport_lun_stop_comp);
484 return 1;
485 }
486 /*
487 * Determine if frontend context caller is requesting the stopping of
488 * this command for frontend exceptions.
489 */
490 if (atomic_read(&cmd->t_transport_stop)) {
491 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
492 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
493 cmd->se_tfo->get_task_tag(cmd));
494
495 if (transport_off == 2)
496 transport_all_task_dev_remove_state(cmd);
497
498 /*
499 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
500 * to FE.
501 */
502 if (transport_off == 2)
503 cmd->se_lun = NULL;
504 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
505
506 complete(&cmd->t_transport_stop_comp);
507 return 1;
508 }
509 if (transport_off) {
510 atomic_set(&cmd->t_transport_active, 0);
511 if (transport_off == 2) {
512 transport_all_task_dev_remove_state(cmd);
513 /*
514 * Clear struct se_cmd->se_lun before the transport_off == 2
515 * handoff to fabric module.
516 */
517 cmd->se_lun = NULL;
518 /*
519 * Some fabric modules like tcm_loop can release
520 * their internally allocated I/O reference now and
521 * struct se_cmd now.
522 */
523 if (cmd->se_tfo->check_stop_free != NULL) {
524 spin_unlock_irqrestore(
525 &cmd->t_state_lock, flags);
526
527 cmd->se_tfo->check_stop_free(cmd);
528 return 1;
529 }
530 }
531 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
532
533 return 0;
534 } else if (t_state)
535 cmd->t_state = t_state;
536 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
537
538 return 0;
539 }
540
541 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
542 {
543 return transport_cmd_check_stop(cmd, 2, 0);
544 }
545
546 static void transport_lun_remove_cmd(struct se_cmd *cmd)
547 {
548 struct se_lun *lun = cmd->se_lun;
549 unsigned long flags;
550
551 if (!lun)
552 return;
553
554 spin_lock_irqsave(&cmd->t_state_lock, flags);
555 if (!atomic_read(&cmd->transport_dev_active)) {
556 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
557 goto check_lun;
558 }
559 atomic_set(&cmd->transport_dev_active, 0);
560 transport_all_task_dev_remove_state(cmd);
561 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
562
563
564 check_lun:
565 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
566 if (atomic_read(&cmd->transport_lun_active)) {
567 list_del(&cmd->se_lun_node);
568 atomic_set(&cmd->transport_lun_active, 0);
569 #if 0
570 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
571 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
572 #endif
573 }
574 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
575 }
576
577 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
578 {
579 if (!cmd->se_tmr_req)
580 transport_lun_remove_cmd(cmd);
581
582 if (transport_cmd_check_stop_to_fabric(cmd))
583 return;
584 if (remove) {
585 transport_remove_cmd_from_queue(cmd);
586 transport_put_cmd(cmd);
587 }
588 }
589
590 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
591 bool at_head)
592 {
593 struct se_device *dev = cmd->se_dev;
594 struct se_queue_obj *qobj = &dev->dev_queue_obj;
595 unsigned long flags;
596
597 if (t_state) {
598 spin_lock_irqsave(&cmd->t_state_lock, flags);
599 cmd->t_state = t_state;
600 atomic_set(&cmd->t_transport_active, 1);
601 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
602 }
603
604 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
605
606 /* If the cmd is already on the list, remove it before we add it */
607 if (!list_empty(&cmd->se_queue_node))
608 list_del(&cmd->se_queue_node);
609 else
610 atomic_inc(&qobj->queue_cnt);
611
612 if (at_head)
613 list_add(&cmd->se_queue_node, &qobj->qobj_list);
614 else
615 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
616 atomic_set(&cmd->t_transport_queue_active, 1);
617 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
618
619 wake_up_interruptible(&qobj->thread_wq);
620 }
621
622 static struct se_cmd *
623 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
624 {
625 struct se_cmd *cmd;
626 unsigned long flags;
627
628 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
629 if (list_empty(&qobj->qobj_list)) {
630 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
631 return NULL;
632 }
633 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
634
635 atomic_set(&cmd->t_transport_queue_active, 0);
636
637 list_del_init(&cmd->se_queue_node);
638 atomic_dec(&qobj->queue_cnt);
639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640
641 return cmd;
642 }
643
644 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
645 {
646 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
647 unsigned long flags;
648
649 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
650 if (!atomic_read(&cmd->t_transport_queue_active)) {
651 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
652 return;
653 }
654 atomic_set(&cmd->t_transport_queue_active, 0);
655 atomic_dec(&qobj->queue_cnt);
656 list_del_init(&cmd->se_queue_node);
657 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
658
659 if (atomic_read(&cmd->t_transport_queue_active)) {
660 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
661 cmd->se_tfo->get_task_tag(cmd),
662 atomic_read(&cmd->t_transport_queue_active));
663 }
664 }
665
666 /*
667 * Completion function used by TCM subsystem plugins (such as FILEIO)
668 * for queueing up response from struct se_subsystem_api->do_task()
669 */
670 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
671 {
672 struct se_task *task = list_entry(cmd->t_task_list.next,
673 struct se_task, t_list);
674
675 if (good) {
676 cmd->scsi_status = SAM_STAT_GOOD;
677 task->task_scsi_status = GOOD;
678 } else {
679 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
680 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
681 task->task_se_cmd->transport_error_status =
682 PYX_TRANSPORT_ILLEGAL_REQUEST;
683 }
684
685 transport_complete_task(task, good);
686 }
687 EXPORT_SYMBOL(transport_complete_sync_cache);
688
689 static void target_complete_timeout_work(struct work_struct *work)
690 {
691 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
692 unsigned long flags;
693
694 /*
695 * Reset cmd->t_se_count to allow transport_put_cmd()
696 * to allow last call to free memory resources.
697 */
698 spin_lock_irqsave(&cmd->t_state_lock, flags);
699 if (atomic_read(&cmd->t_transport_timeout) > 1) {
700 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
701
702 atomic_sub(tmp, &cmd->t_se_count);
703 }
704 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
705
706 transport_put_cmd(cmd);
707 }
708
709 static void target_complete_failure_work(struct work_struct *work)
710 {
711 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
712
713 transport_generic_request_failure(cmd, 1, 1);
714 }
715
716 /* transport_complete_task():
717 *
718 * Called from interrupt and non interrupt context depending
719 * on the transport plugin.
720 */
721 void transport_complete_task(struct se_task *task, int success)
722 {
723 struct se_cmd *cmd = task->task_se_cmd;
724 struct se_device *dev = cmd->se_dev;
725 unsigned long flags;
726 #if 0
727 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
728 cmd->t_task_cdb[0], dev);
729 #endif
730 if (dev)
731 atomic_inc(&dev->depth_left);
732
733 del_timer(&task->task_timer);
734
735 spin_lock_irqsave(&cmd->t_state_lock, flags);
736 task->task_flags &= ~TF_ACTIVE;
737
738 /*
739 * See if any sense data exists, if so set the TASK_SENSE flag.
740 * Also check for any other post completion work that needs to be
741 * done by the plugins.
742 */
743 if (dev && dev->transport->transport_complete) {
744 if (dev->transport->transport_complete(task) != 0) {
745 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
746 task->task_sense = 1;
747 success = 1;
748 }
749 }
750
751 /*
752 * See if we are waiting for outstanding struct se_task
753 * to complete for an exception condition
754 */
755 if (task->task_flags & TF_REQUEST_STOP) {
756 /*
757 * Decrement cmd->t_se_count if this task had
758 * previously thrown its timeout exception handler.
759 */
760 if (task->task_flags & TF_TIMEOUT) {
761 atomic_dec(&cmd->t_se_count);
762 task->task_flags &= ~TF_TIMEOUT;
763 }
764 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
765
766 complete(&task->task_stop_comp);
767 return;
768 }
769 /*
770 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
771 * left counter to determine when the struct se_cmd is ready to be queued to
772 * the processing thread.
773 */
774 if (task->task_flags & TF_TIMEOUT) {
775 if (!atomic_dec_and_test(&cmd->t_task_cdbs_timeout_left)) {
776 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
777 return;
778 }
779 INIT_WORK(&cmd->work, target_complete_timeout_work);
780 goto out_queue;
781 }
782 atomic_dec(&cmd->t_task_cdbs_timeout_left);
783
784 /*
785 * Decrement the outstanding t_task_cdbs_left count. The last
786 * struct se_task from struct se_cmd will complete itself into the
787 * device queue depending upon int success.
788 */
789 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
790 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
791 return;
792 }
793
794 if (!success || cmd->t_tasks_failed) {
795 if (!task->task_error_status) {
796 task->task_error_status =
797 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
798 cmd->transport_error_status =
799 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
800 }
801 INIT_WORK(&cmd->work, target_complete_failure_work);
802 } else {
803 atomic_set(&cmd->t_transport_complete, 1);
804 INIT_WORK(&cmd->work, target_complete_ok_work);
805 }
806
807 out_queue:
808 cmd->t_state = TRANSPORT_COMPLETE;
809 atomic_set(&cmd->t_transport_active, 1);
810 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
811
812 queue_work(target_completion_wq, &cmd->work);
813 }
814 EXPORT_SYMBOL(transport_complete_task);
815
816 /*
817 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
818 * struct se_task list are ready to be added to the active execution list
819 * struct se_device
820
821 * Called with se_dev_t->execute_task_lock called.
822 */
823 static inline int transport_add_task_check_sam_attr(
824 struct se_task *task,
825 struct se_task *task_prev,
826 struct se_device *dev)
827 {
828 /*
829 * No SAM Task attribute emulation enabled, add to tail of
830 * execution queue
831 */
832 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
833 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
834 return 0;
835 }
836 /*
837 * HEAD_OF_QUEUE attribute for received CDB, which means
838 * the first task that is associated with a struct se_cmd goes to
839 * head of the struct se_device->execute_task_list, and task_prev
840 * after that for each subsequent task
841 */
842 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
843 list_add(&task->t_execute_list,
844 (task_prev != NULL) ?
845 &task_prev->t_execute_list :
846 &dev->execute_task_list);
847
848 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
849 " in execution queue\n",
850 task->task_se_cmd->t_task_cdb[0]);
851 return 1;
852 }
853 /*
854 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
855 * transitioned from Dermant -> Active state, and are added to the end
856 * of the struct se_device->execute_task_list
857 */
858 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
859 return 0;
860 }
861
862 /* __transport_add_task_to_execute_queue():
863 *
864 * Called with se_dev_t->execute_task_lock called.
865 */
866 static void __transport_add_task_to_execute_queue(
867 struct se_task *task,
868 struct se_task *task_prev,
869 struct se_device *dev)
870 {
871 int head_of_queue;
872
873 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
874 atomic_inc(&dev->execute_tasks);
875
876 if (atomic_read(&task->task_state_active))
877 return;
878 /*
879 * Determine if this task needs to go to HEAD_OF_QUEUE for the
880 * state list as well. Running with SAM Task Attribute emulation
881 * will always return head_of_queue == 0 here
882 */
883 if (head_of_queue)
884 list_add(&task->t_state_list, (task_prev) ?
885 &task_prev->t_state_list :
886 &dev->state_task_list);
887 else
888 list_add_tail(&task->t_state_list, &dev->state_task_list);
889
890 atomic_set(&task->task_state_active, 1);
891
892 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
893 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
894 task, dev);
895 }
896
897 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
898 {
899 struct se_device *dev = cmd->se_dev;
900 struct se_task *task;
901 unsigned long flags;
902
903 spin_lock_irqsave(&cmd->t_state_lock, flags);
904 list_for_each_entry(task, &cmd->t_task_list, t_list) {
905 if (atomic_read(&task->task_state_active))
906 continue;
907
908 spin_lock(&dev->execute_task_lock);
909 list_add_tail(&task->t_state_list, &dev->state_task_list);
910 atomic_set(&task->task_state_active, 1);
911
912 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
913 task->task_se_cmd->se_tfo->get_task_tag(
914 task->task_se_cmd), task, dev);
915
916 spin_unlock(&dev->execute_task_lock);
917 }
918 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
919 }
920
921 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
922 {
923 struct se_device *dev = cmd->se_dev;
924 struct se_task *task, *task_prev = NULL;
925 unsigned long flags;
926
927 spin_lock_irqsave(&dev->execute_task_lock, flags);
928 list_for_each_entry(task, &cmd->t_task_list, t_list) {
929 if (!list_empty(&task->t_execute_list))
930 continue;
931 /*
932 * __transport_add_task_to_execute_queue() handles the
933 * SAM Task Attribute emulation if enabled
934 */
935 __transport_add_task_to_execute_queue(task, task_prev, dev);
936 task_prev = task;
937 }
938 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
939 }
940
941 void __transport_remove_task_from_execute_queue(struct se_task *task,
942 struct se_device *dev)
943 {
944 list_del_init(&task->t_execute_list);
945 atomic_dec(&dev->execute_tasks);
946 }
947
948 void transport_remove_task_from_execute_queue(
949 struct se_task *task,
950 struct se_device *dev)
951 {
952 unsigned long flags;
953
954 if (WARN_ON(list_empty(&task->t_execute_list)))
955 return;
956
957 spin_lock_irqsave(&dev->execute_task_lock, flags);
958 __transport_remove_task_from_execute_queue(task, dev);
959 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
960 }
961
962 /*
963 * Handle QUEUE_FULL / -EAGAIN status
964 */
965
966 static void target_qf_do_work(struct work_struct *work)
967 {
968 struct se_device *dev = container_of(work, struct se_device,
969 qf_work_queue);
970 LIST_HEAD(qf_cmd_list);
971 struct se_cmd *cmd, *cmd_tmp;
972
973 spin_lock_irq(&dev->qf_cmd_lock);
974 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
975 spin_unlock_irq(&dev->qf_cmd_lock);
976
977 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
978 list_del(&cmd->se_qf_node);
979 atomic_dec(&dev->dev_qf_count);
980 smp_mb__after_atomic_dec();
981
982 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
983 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
984 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
985 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
986 : "UNKNOWN");
987
988 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
989 }
990 }
991
992 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
993 {
994 switch (cmd->data_direction) {
995 case DMA_NONE:
996 return "NONE";
997 case DMA_FROM_DEVICE:
998 return "READ";
999 case DMA_TO_DEVICE:
1000 return "WRITE";
1001 case DMA_BIDIRECTIONAL:
1002 return "BIDI";
1003 default:
1004 break;
1005 }
1006
1007 return "UNKNOWN";
1008 }
1009
1010 void transport_dump_dev_state(
1011 struct se_device *dev,
1012 char *b,
1013 int *bl)
1014 {
1015 *bl += sprintf(b + *bl, "Status: ");
1016 switch (dev->dev_status) {
1017 case TRANSPORT_DEVICE_ACTIVATED:
1018 *bl += sprintf(b + *bl, "ACTIVATED");
1019 break;
1020 case TRANSPORT_DEVICE_DEACTIVATED:
1021 *bl += sprintf(b + *bl, "DEACTIVATED");
1022 break;
1023 case TRANSPORT_DEVICE_SHUTDOWN:
1024 *bl += sprintf(b + *bl, "SHUTDOWN");
1025 break;
1026 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1027 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1028 *bl += sprintf(b + *bl, "OFFLINE");
1029 break;
1030 default:
1031 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1032 break;
1033 }
1034
1035 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1036 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1037 dev->queue_depth);
1038 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
1039 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
1040 *bl += sprintf(b + *bl, " ");
1041 }
1042
1043 void transport_dump_vpd_proto_id(
1044 struct t10_vpd *vpd,
1045 unsigned char *p_buf,
1046 int p_buf_len)
1047 {
1048 unsigned char buf[VPD_TMP_BUF_SIZE];
1049 int len;
1050
1051 memset(buf, 0, VPD_TMP_BUF_SIZE);
1052 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1053
1054 switch (vpd->protocol_identifier) {
1055 case 0x00:
1056 sprintf(buf+len, "Fibre Channel\n");
1057 break;
1058 case 0x10:
1059 sprintf(buf+len, "Parallel SCSI\n");
1060 break;
1061 case 0x20:
1062 sprintf(buf+len, "SSA\n");
1063 break;
1064 case 0x30:
1065 sprintf(buf+len, "IEEE 1394\n");
1066 break;
1067 case 0x40:
1068 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1069 " Protocol\n");
1070 break;
1071 case 0x50:
1072 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1073 break;
1074 case 0x60:
1075 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1076 break;
1077 case 0x70:
1078 sprintf(buf+len, "Automation/Drive Interface Transport"
1079 " Protocol\n");
1080 break;
1081 case 0x80:
1082 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1083 break;
1084 default:
1085 sprintf(buf+len, "Unknown 0x%02x\n",
1086 vpd->protocol_identifier);
1087 break;
1088 }
1089
1090 if (p_buf)
1091 strncpy(p_buf, buf, p_buf_len);
1092 else
1093 pr_debug("%s", buf);
1094 }
1095
1096 void
1097 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1098 {
1099 /*
1100 * Check if the Protocol Identifier Valid (PIV) bit is set..
1101 *
1102 * from spc3r23.pdf section 7.5.1
1103 */
1104 if (page_83[1] & 0x80) {
1105 vpd->protocol_identifier = (page_83[0] & 0xf0);
1106 vpd->protocol_identifier_set = 1;
1107 transport_dump_vpd_proto_id(vpd, NULL, 0);
1108 }
1109 }
1110 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1111
1112 int transport_dump_vpd_assoc(
1113 struct t10_vpd *vpd,
1114 unsigned char *p_buf,
1115 int p_buf_len)
1116 {
1117 unsigned char buf[VPD_TMP_BUF_SIZE];
1118 int ret = 0;
1119 int len;
1120
1121 memset(buf, 0, VPD_TMP_BUF_SIZE);
1122 len = sprintf(buf, "T10 VPD Identifier Association: ");
1123
1124 switch (vpd->association) {
1125 case 0x00:
1126 sprintf(buf+len, "addressed logical unit\n");
1127 break;
1128 case 0x10:
1129 sprintf(buf+len, "target port\n");
1130 break;
1131 case 0x20:
1132 sprintf(buf+len, "SCSI target device\n");
1133 break;
1134 default:
1135 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1136 ret = -EINVAL;
1137 break;
1138 }
1139
1140 if (p_buf)
1141 strncpy(p_buf, buf, p_buf_len);
1142 else
1143 pr_debug("%s", buf);
1144
1145 return ret;
1146 }
1147
1148 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1149 {
1150 /*
1151 * The VPD identification association..
1152 *
1153 * from spc3r23.pdf Section 7.6.3.1 Table 297
1154 */
1155 vpd->association = (page_83[1] & 0x30);
1156 return transport_dump_vpd_assoc(vpd, NULL, 0);
1157 }
1158 EXPORT_SYMBOL(transport_set_vpd_assoc);
1159
1160 int transport_dump_vpd_ident_type(
1161 struct t10_vpd *vpd,
1162 unsigned char *p_buf,
1163 int p_buf_len)
1164 {
1165 unsigned char buf[VPD_TMP_BUF_SIZE];
1166 int ret = 0;
1167 int len;
1168
1169 memset(buf, 0, VPD_TMP_BUF_SIZE);
1170 len = sprintf(buf, "T10 VPD Identifier Type: ");
1171
1172 switch (vpd->device_identifier_type) {
1173 case 0x00:
1174 sprintf(buf+len, "Vendor specific\n");
1175 break;
1176 case 0x01:
1177 sprintf(buf+len, "T10 Vendor ID based\n");
1178 break;
1179 case 0x02:
1180 sprintf(buf+len, "EUI-64 based\n");
1181 break;
1182 case 0x03:
1183 sprintf(buf+len, "NAA\n");
1184 break;
1185 case 0x04:
1186 sprintf(buf+len, "Relative target port identifier\n");
1187 break;
1188 case 0x08:
1189 sprintf(buf+len, "SCSI name string\n");
1190 break;
1191 default:
1192 sprintf(buf+len, "Unsupported: 0x%02x\n",
1193 vpd->device_identifier_type);
1194 ret = -EINVAL;
1195 break;
1196 }
1197
1198 if (p_buf) {
1199 if (p_buf_len < strlen(buf)+1)
1200 return -EINVAL;
1201 strncpy(p_buf, buf, p_buf_len);
1202 } else {
1203 pr_debug("%s", buf);
1204 }
1205
1206 return ret;
1207 }
1208
1209 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1210 {
1211 /*
1212 * The VPD identifier type..
1213 *
1214 * from spc3r23.pdf Section 7.6.3.1 Table 298
1215 */
1216 vpd->device_identifier_type = (page_83[1] & 0x0f);
1217 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1218 }
1219 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1220
1221 int transport_dump_vpd_ident(
1222 struct t10_vpd *vpd,
1223 unsigned char *p_buf,
1224 int p_buf_len)
1225 {
1226 unsigned char buf[VPD_TMP_BUF_SIZE];
1227 int ret = 0;
1228
1229 memset(buf, 0, VPD_TMP_BUF_SIZE);
1230
1231 switch (vpd->device_identifier_code_set) {
1232 case 0x01: /* Binary */
1233 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1234 &vpd->device_identifier[0]);
1235 break;
1236 case 0x02: /* ASCII */
1237 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1238 &vpd->device_identifier[0]);
1239 break;
1240 case 0x03: /* UTF-8 */
1241 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1242 &vpd->device_identifier[0]);
1243 break;
1244 default:
1245 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1246 " 0x%02x", vpd->device_identifier_code_set);
1247 ret = -EINVAL;
1248 break;
1249 }
1250
1251 if (p_buf)
1252 strncpy(p_buf, buf, p_buf_len);
1253 else
1254 pr_debug("%s", buf);
1255
1256 return ret;
1257 }
1258
1259 int
1260 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1261 {
1262 static const char hex_str[] = "0123456789abcdef";
1263 int j = 0, i = 4; /* offset to start of the identifer */
1264
1265 /*
1266 * The VPD Code Set (encoding)
1267 *
1268 * from spc3r23.pdf Section 7.6.3.1 Table 296
1269 */
1270 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1271 switch (vpd->device_identifier_code_set) {
1272 case 0x01: /* Binary */
1273 vpd->device_identifier[j++] =
1274 hex_str[vpd->device_identifier_type];
1275 while (i < (4 + page_83[3])) {
1276 vpd->device_identifier[j++] =
1277 hex_str[(page_83[i] & 0xf0) >> 4];
1278 vpd->device_identifier[j++] =
1279 hex_str[page_83[i] & 0x0f];
1280 i++;
1281 }
1282 break;
1283 case 0x02: /* ASCII */
1284 case 0x03: /* UTF-8 */
1285 while (i < (4 + page_83[3]))
1286 vpd->device_identifier[j++] = page_83[i++];
1287 break;
1288 default:
1289 break;
1290 }
1291
1292 return transport_dump_vpd_ident(vpd, NULL, 0);
1293 }
1294 EXPORT_SYMBOL(transport_set_vpd_ident);
1295
1296 static void core_setup_task_attr_emulation(struct se_device *dev)
1297 {
1298 /*
1299 * If this device is from Target_Core_Mod/pSCSI, disable the
1300 * SAM Task Attribute emulation.
1301 *
1302 * This is currently not available in upsream Linux/SCSI Target
1303 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1304 */
1305 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1306 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1307 return;
1308 }
1309
1310 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1311 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1312 " device\n", dev->transport->name,
1313 dev->transport->get_device_rev(dev));
1314 }
1315
1316 static void scsi_dump_inquiry(struct se_device *dev)
1317 {
1318 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1319 int i, device_type;
1320 /*
1321 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1322 */
1323 pr_debug(" Vendor: ");
1324 for (i = 0; i < 8; i++)
1325 if (wwn->vendor[i] >= 0x20)
1326 pr_debug("%c", wwn->vendor[i]);
1327 else
1328 pr_debug(" ");
1329
1330 pr_debug(" Model: ");
1331 for (i = 0; i < 16; i++)
1332 if (wwn->model[i] >= 0x20)
1333 pr_debug("%c", wwn->model[i]);
1334 else
1335 pr_debug(" ");
1336
1337 pr_debug(" Revision: ");
1338 for (i = 0; i < 4; i++)
1339 if (wwn->revision[i] >= 0x20)
1340 pr_debug("%c", wwn->revision[i]);
1341 else
1342 pr_debug(" ");
1343
1344 pr_debug("\n");
1345
1346 device_type = dev->transport->get_device_type(dev);
1347 pr_debug(" Type: %s ", scsi_device_type(device_type));
1348 pr_debug(" ANSI SCSI revision: %02x\n",
1349 dev->transport->get_device_rev(dev));
1350 }
1351
1352 struct se_device *transport_add_device_to_core_hba(
1353 struct se_hba *hba,
1354 struct se_subsystem_api *transport,
1355 struct se_subsystem_dev *se_dev,
1356 u32 device_flags,
1357 void *transport_dev,
1358 struct se_dev_limits *dev_limits,
1359 const char *inquiry_prod,
1360 const char *inquiry_rev)
1361 {
1362 int force_pt;
1363 struct se_device *dev;
1364
1365 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1366 if (!dev) {
1367 pr_err("Unable to allocate memory for se_dev_t\n");
1368 return NULL;
1369 }
1370
1371 transport_init_queue_obj(&dev->dev_queue_obj);
1372 dev->dev_flags = device_flags;
1373 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1374 dev->dev_ptr = transport_dev;
1375 dev->se_hba = hba;
1376 dev->se_sub_dev = se_dev;
1377 dev->transport = transport;
1378 atomic_set(&dev->active_cmds, 0);
1379 INIT_LIST_HEAD(&dev->dev_list);
1380 INIT_LIST_HEAD(&dev->dev_sep_list);
1381 INIT_LIST_HEAD(&dev->dev_tmr_list);
1382 INIT_LIST_HEAD(&dev->execute_task_list);
1383 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1384 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1385 INIT_LIST_HEAD(&dev->state_task_list);
1386 INIT_LIST_HEAD(&dev->qf_cmd_list);
1387 spin_lock_init(&dev->execute_task_lock);
1388 spin_lock_init(&dev->delayed_cmd_lock);
1389 spin_lock_init(&dev->ordered_cmd_lock);
1390 spin_lock_init(&dev->state_task_lock);
1391 spin_lock_init(&dev->dev_alua_lock);
1392 spin_lock_init(&dev->dev_reservation_lock);
1393 spin_lock_init(&dev->dev_status_lock);
1394 spin_lock_init(&dev->dev_status_thr_lock);
1395 spin_lock_init(&dev->se_port_lock);
1396 spin_lock_init(&dev->se_tmr_lock);
1397 spin_lock_init(&dev->qf_cmd_lock);
1398
1399 dev->queue_depth = dev_limits->queue_depth;
1400 atomic_set(&dev->depth_left, dev->queue_depth);
1401 atomic_set(&dev->dev_ordered_id, 0);
1402
1403 se_dev_set_default_attribs(dev, dev_limits);
1404
1405 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1406 dev->creation_time = get_jiffies_64();
1407 spin_lock_init(&dev->stats_lock);
1408
1409 spin_lock(&hba->device_lock);
1410 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1411 hba->dev_count++;
1412 spin_unlock(&hba->device_lock);
1413 /*
1414 * Setup the SAM Task Attribute emulation for struct se_device
1415 */
1416 core_setup_task_attr_emulation(dev);
1417 /*
1418 * Force PR and ALUA passthrough emulation with internal object use.
1419 */
1420 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1421 /*
1422 * Setup the Reservations infrastructure for struct se_device
1423 */
1424 core_setup_reservations(dev, force_pt);
1425 /*
1426 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1427 */
1428 if (core_setup_alua(dev, force_pt) < 0)
1429 goto out;
1430
1431 /*
1432 * Startup the struct se_device processing thread
1433 */
1434 dev->process_thread = kthread_run(transport_processing_thread, dev,
1435 "LIO_%s", dev->transport->name);
1436 if (IS_ERR(dev->process_thread)) {
1437 pr_err("Unable to create kthread: LIO_%s\n",
1438 dev->transport->name);
1439 goto out;
1440 }
1441 /*
1442 * Setup work_queue for QUEUE_FULL
1443 */
1444 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1445 /*
1446 * Preload the initial INQUIRY const values if we are doing
1447 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1448 * passthrough because this is being provided by the backend LLD.
1449 * This is required so that transport_get_inquiry() copies these
1450 * originals once back into DEV_T10_WWN(dev) for the virtual device
1451 * setup.
1452 */
1453 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1454 if (!inquiry_prod || !inquiry_rev) {
1455 pr_err("All non TCM/pSCSI plugins require"
1456 " INQUIRY consts\n");
1457 goto out;
1458 }
1459
1460 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1461 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1462 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1463 }
1464 scsi_dump_inquiry(dev);
1465
1466 return dev;
1467 out:
1468 kthread_stop(dev->process_thread);
1469
1470 spin_lock(&hba->device_lock);
1471 list_del(&dev->dev_list);
1472 hba->dev_count--;
1473 spin_unlock(&hba->device_lock);
1474
1475 se_release_vpd_for_dev(dev);
1476
1477 kfree(dev);
1478
1479 return NULL;
1480 }
1481 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1482
1483 /* transport_generic_prepare_cdb():
1484 *
1485 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1486 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1487 * The point of this is since we are mapping iSCSI LUNs to
1488 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1489 * devices and HBAs for a loop.
1490 */
1491 static inline void transport_generic_prepare_cdb(
1492 unsigned char *cdb)
1493 {
1494 switch (cdb[0]) {
1495 case READ_10: /* SBC - RDProtect */
1496 case READ_12: /* SBC - RDProtect */
1497 case READ_16: /* SBC - RDProtect */
1498 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1499 case VERIFY: /* SBC - VRProtect */
1500 case VERIFY_16: /* SBC - VRProtect */
1501 case WRITE_VERIFY: /* SBC - VRProtect */
1502 case WRITE_VERIFY_12: /* SBC - VRProtect */
1503 break;
1504 default:
1505 cdb[1] &= 0x1f; /* clear logical unit number */
1506 break;
1507 }
1508 }
1509
1510 static struct se_task *
1511 transport_generic_get_task(struct se_cmd *cmd,
1512 enum dma_data_direction data_direction)
1513 {
1514 struct se_task *task;
1515 struct se_device *dev = cmd->se_dev;
1516
1517 task = dev->transport->alloc_task(cmd->t_task_cdb);
1518 if (!task) {
1519 pr_err("Unable to allocate struct se_task\n");
1520 return NULL;
1521 }
1522
1523 INIT_LIST_HEAD(&task->t_list);
1524 INIT_LIST_HEAD(&task->t_execute_list);
1525 INIT_LIST_HEAD(&task->t_state_list);
1526 init_timer(&task->task_timer);
1527 init_completion(&task->task_stop_comp);
1528 task->task_se_cmd = cmd;
1529 task->task_data_direction = data_direction;
1530
1531 return task;
1532 }
1533
1534 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1535
1536 /*
1537 * Used by fabric modules containing a local struct se_cmd within their
1538 * fabric dependent per I/O descriptor.
1539 */
1540 void transport_init_se_cmd(
1541 struct se_cmd *cmd,
1542 struct target_core_fabric_ops *tfo,
1543 struct se_session *se_sess,
1544 u32 data_length,
1545 int data_direction,
1546 int task_attr,
1547 unsigned char *sense_buffer)
1548 {
1549 INIT_LIST_HEAD(&cmd->se_lun_node);
1550 INIT_LIST_HEAD(&cmd->se_delayed_node);
1551 INIT_LIST_HEAD(&cmd->se_ordered_node);
1552 INIT_LIST_HEAD(&cmd->se_qf_node);
1553 INIT_LIST_HEAD(&cmd->se_queue_node);
1554
1555 INIT_LIST_HEAD(&cmd->t_task_list);
1556 init_completion(&cmd->transport_lun_fe_stop_comp);
1557 init_completion(&cmd->transport_lun_stop_comp);
1558 init_completion(&cmd->t_transport_stop_comp);
1559 spin_lock_init(&cmd->t_state_lock);
1560 atomic_set(&cmd->transport_dev_active, 1);
1561
1562 cmd->se_tfo = tfo;
1563 cmd->se_sess = se_sess;
1564 cmd->data_length = data_length;
1565 cmd->data_direction = data_direction;
1566 cmd->sam_task_attr = task_attr;
1567 cmd->sense_buffer = sense_buffer;
1568 }
1569 EXPORT_SYMBOL(transport_init_se_cmd);
1570
1571 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1572 {
1573 /*
1574 * Check if SAM Task Attribute emulation is enabled for this
1575 * struct se_device storage object
1576 */
1577 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1578 return 0;
1579
1580 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1581 pr_debug("SAM Task Attribute ACA"
1582 " emulation is not supported\n");
1583 return -EINVAL;
1584 }
1585 /*
1586 * Used to determine when ORDERED commands should go from
1587 * Dormant to Active status.
1588 */
1589 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1590 smp_mb__after_atomic_inc();
1591 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1592 cmd->se_ordered_id, cmd->sam_task_attr,
1593 cmd->se_dev->transport->name);
1594 return 0;
1595 }
1596
1597 /* transport_generic_allocate_tasks():
1598 *
1599 * Called from fabric RX Thread.
1600 */
1601 int transport_generic_allocate_tasks(
1602 struct se_cmd *cmd,
1603 unsigned char *cdb)
1604 {
1605 int ret;
1606
1607 transport_generic_prepare_cdb(cdb);
1608 /*
1609 * Ensure that the received CDB is less than the max (252 + 8) bytes
1610 * for VARIABLE_LENGTH_CMD
1611 */
1612 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1613 pr_err("Received SCSI CDB with command_size: %d that"
1614 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1615 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1616 return -EINVAL;
1617 }
1618 /*
1619 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1620 * allocate the additional extended CDB buffer now.. Otherwise
1621 * setup the pointer from __t_task_cdb to t_task_cdb.
1622 */
1623 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1624 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1625 GFP_KERNEL);
1626 if (!cmd->t_task_cdb) {
1627 pr_err("Unable to allocate cmd->t_task_cdb"
1628 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1629 scsi_command_size(cdb),
1630 (unsigned long)sizeof(cmd->__t_task_cdb));
1631 return -ENOMEM;
1632 }
1633 } else
1634 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1635 /*
1636 * Copy the original CDB into cmd->
1637 */
1638 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1639 /*
1640 * Setup the received CDB based on SCSI defined opcodes and
1641 * perform unit attention, persistent reservations and ALUA
1642 * checks for virtual device backends. The cmd->t_task_cdb
1643 * pointer is expected to be setup before we reach this point.
1644 */
1645 ret = transport_generic_cmd_sequencer(cmd, cdb);
1646 if (ret < 0)
1647 return ret;
1648 /*
1649 * Check for SAM Task Attribute Emulation
1650 */
1651 if (transport_check_alloc_task_attr(cmd) < 0) {
1652 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1653 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1654 return -EINVAL;
1655 }
1656 spin_lock(&cmd->se_lun->lun_sep_lock);
1657 if (cmd->se_lun->lun_sep)
1658 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1659 spin_unlock(&cmd->se_lun->lun_sep_lock);
1660 return 0;
1661 }
1662 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1663
1664 /*
1665 * Used by fabric module frontends to queue tasks directly.
1666 * Many only be used from process context only
1667 */
1668 int transport_handle_cdb_direct(
1669 struct se_cmd *cmd)
1670 {
1671 int ret;
1672
1673 if (!cmd->se_lun) {
1674 dump_stack();
1675 pr_err("cmd->se_lun is NULL\n");
1676 return -EINVAL;
1677 }
1678 if (in_interrupt()) {
1679 dump_stack();
1680 pr_err("transport_generic_handle_cdb cannot be called"
1681 " from interrupt context\n");
1682 return -EINVAL;
1683 }
1684 /*
1685 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1686 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1687 * in existing usage to ensure that outstanding descriptors are handled
1688 * correctly during shutdown via transport_wait_for_tasks()
1689 *
1690 * Also, we don't take cmd->t_state_lock here as we only expect
1691 * this to be called for initial descriptor submission.
1692 */
1693 cmd->t_state = TRANSPORT_NEW_CMD;
1694 atomic_set(&cmd->t_transport_active, 1);
1695 /*
1696 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1697 * so follow TRANSPORT_NEW_CMD processing thread context usage
1698 * and call transport_generic_request_failure() if necessary..
1699 */
1700 ret = transport_generic_new_cmd(cmd);
1701 if (ret == -EAGAIN)
1702 return 0;
1703 else if (ret < 0) {
1704 cmd->transport_error_status = ret;
1705 transport_generic_request_failure(cmd, 0,
1706 (cmd->data_direction != DMA_TO_DEVICE));
1707 }
1708 return 0;
1709 }
1710 EXPORT_SYMBOL(transport_handle_cdb_direct);
1711
1712 /*
1713 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1714 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1715 * complete setup in TCM process context w/ TFO->new_cmd_map().
1716 */
1717 int transport_generic_handle_cdb_map(
1718 struct se_cmd *cmd)
1719 {
1720 if (!cmd->se_lun) {
1721 dump_stack();
1722 pr_err("cmd->se_lun is NULL\n");
1723 return -EINVAL;
1724 }
1725
1726 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1727 return 0;
1728 }
1729 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1730
1731 /* transport_generic_handle_data():
1732 *
1733 *
1734 */
1735 int transport_generic_handle_data(
1736 struct se_cmd *cmd)
1737 {
1738 /*
1739 * For the software fabric case, then we assume the nexus is being
1740 * failed/shutdown when signals are pending from the kthread context
1741 * caller, so we return a failure. For the HW target mode case running
1742 * in interrupt code, the signal_pending() check is skipped.
1743 */
1744 if (!in_interrupt() && signal_pending(current))
1745 return -EPERM;
1746 /*
1747 * If the received CDB has aleady been ABORTED by the generic
1748 * target engine, we now call transport_check_aborted_status()
1749 * to queue any delated TASK_ABORTED status for the received CDB to the
1750 * fabric module as we are expecting no further incoming DATA OUT
1751 * sequences at this point.
1752 */
1753 if (transport_check_aborted_status(cmd, 1) != 0)
1754 return 0;
1755
1756 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1757 return 0;
1758 }
1759 EXPORT_SYMBOL(transport_generic_handle_data);
1760
1761 /* transport_generic_handle_tmr():
1762 *
1763 *
1764 */
1765 int transport_generic_handle_tmr(
1766 struct se_cmd *cmd)
1767 {
1768 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1769 return 0;
1770 }
1771 EXPORT_SYMBOL(transport_generic_handle_tmr);
1772
1773 void transport_generic_free_cmd_intr(
1774 struct se_cmd *cmd)
1775 {
1776 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
1777 }
1778 EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1779
1780 /*
1781 * If the task is active, request it to be stopped and sleep until it
1782 * has completed.
1783 */
1784 bool target_stop_task(struct se_task *task, unsigned long *flags)
1785 {
1786 struct se_cmd *cmd = task->task_se_cmd;
1787 bool was_active = false;
1788
1789 if (task->task_flags & TF_ACTIVE) {
1790 task->task_flags |= TF_REQUEST_STOP;
1791 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1792
1793 pr_debug("Task %p waiting to complete\n", task);
1794 del_timer_sync(&task->task_timer);
1795 wait_for_completion(&task->task_stop_comp);
1796 pr_debug("Task %p stopped successfully\n", task);
1797
1798 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1799 atomic_dec(&cmd->t_task_cdbs_left);
1800 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1801 was_active = true;
1802 }
1803
1804 return was_active;
1805 }
1806
1807 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1808 {
1809 struct se_task *task, *task_tmp;
1810 unsigned long flags;
1811 int ret = 0;
1812
1813 pr_debug("ITT[0x%08x] - Stopping tasks\n",
1814 cmd->se_tfo->get_task_tag(cmd));
1815
1816 /*
1817 * No tasks remain in the execution queue
1818 */
1819 spin_lock_irqsave(&cmd->t_state_lock, flags);
1820 list_for_each_entry_safe(task, task_tmp,
1821 &cmd->t_task_list, t_list) {
1822 pr_debug("Processing task %p\n", task);
1823 /*
1824 * If the struct se_task has not been sent and is not active,
1825 * remove the struct se_task from the execution queue.
1826 */
1827 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1828 spin_unlock_irqrestore(&cmd->t_state_lock,
1829 flags);
1830 transport_remove_task_from_execute_queue(task,
1831 cmd->se_dev);
1832
1833 pr_debug("Task %p removed from execute queue\n", task);
1834 spin_lock_irqsave(&cmd->t_state_lock, flags);
1835 continue;
1836 }
1837
1838 if (!target_stop_task(task, &flags)) {
1839 pr_debug("Task %p - did nothing\n", task);
1840 ret++;
1841 }
1842 }
1843 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1844
1845 return ret;
1846 }
1847
1848 /*
1849 * Handle SAM-esque emulation for generic transport request failures.
1850 */
1851 static void transport_generic_request_failure(
1852 struct se_cmd *cmd,
1853 int complete,
1854 int sc)
1855 {
1856 int ret = 0;
1857
1858 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1859 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1860 cmd->t_task_cdb[0]);
1861 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
1862 cmd->se_tfo->get_cmd_state(cmd),
1863 cmd->t_state,
1864 cmd->transport_error_status);
1865 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1866 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1867 " t_transport_active: %d t_transport_stop: %d"
1868 " t_transport_sent: %d\n", cmd->t_task_list_num,
1869 atomic_read(&cmd->t_task_cdbs_left),
1870 atomic_read(&cmd->t_task_cdbs_sent),
1871 atomic_read(&cmd->t_task_cdbs_ex_left),
1872 atomic_read(&cmd->t_transport_active),
1873 atomic_read(&cmd->t_transport_stop),
1874 atomic_read(&cmd->t_transport_sent));
1875
1876 /*
1877 * For SAM Task Attribute emulation for failed struct se_cmd
1878 */
1879 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1880 transport_complete_task_attr(cmd);
1881
1882 if (complete) {
1883 transport_direct_request_timeout(cmd);
1884 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1885 }
1886
1887 switch (cmd->transport_error_status) {
1888 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1889 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1890 break;
1891 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1892 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1893 break;
1894 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1895 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1896 break;
1897 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1898 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1899 break;
1900 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1901 if (!sc)
1902 transport_new_cmd_failure(cmd);
1903 /*
1904 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1905 * we force this session to fall back to session
1906 * recovery.
1907 */
1908 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1909 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1910
1911 goto check_stop;
1912 case PYX_TRANSPORT_LU_COMM_FAILURE:
1913 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1914 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1915 break;
1916 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1917 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1918 break;
1919 case PYX_TRANSPORT_WRITE_PROTECTED:
1920 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1921 break;
1922 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1923 /*
1924 * No SENSE Data payload for this case, set SCSI Status
1925 * and queue the response to $FABRIC_MOD.
1926 *
1927 * Uses linux/include/scsi/scsi.h SAM status codes defs
1928 */
1929 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1930 /*
1931 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1932 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1933 * CONFLICT STATUS.
1934 *
1935 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1936 */
1937 if (cmd->se_sess &&
1938 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1939 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1940 cmd->orig_fe_lun, 0x2C,
1941 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1942
1943 ret = cmd->se_tfo->queue_status(cmd);
1944 if (ret == -EAGAIN)
1945 goto queue_full;
1946 goto check_stop;
1947 case PYX_TRANSPORT_USE_SENSE_REASON:
1948 /*
1949 * struct se_cmd->scsi_sense_reason already set
1950 */
1951 break;
1952 default:
1953 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1954 cmd->t_task_cdb[0],
1955 cmd->transport_error_status);
1956 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1957 break;
1958 }
1959 /*
1960 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1961 * make the call to transport_send_check_condition_and_sense()
1962 * directly. Otherwise expect the fabric to make the call to
1963 * transport_send_check_condition_and_sense() after handling
1964 * possible unsoliticied write data payloads.
1965 */
1966 if (!sc && !cmd->se_tfo->new_cmd_map)
1967 transport_new_cmd_failure(cmd);
1968 else {
1969 ret = transport_send_check_condition_and_sense(cmd,
1970 cmd->scsi_sense_reason, 0);
1971 if (ret == -EAGAIN)
1972 goto queue_full;
1973 }
1974
1975 check_stop:
1976 transport_lun_remove_cmd(cmd);
1977 if (!transport_cmd_check_stop_to_fabric(cmd))
1978 ;
1979 return;
1980
1981 queue_full:
1982 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1983 transport_handle_queue_full(cmd, cmd->se_dev);
1984 }
1985
1986 static void transport_direct_request_timeout(struct se_cmd *cmd)
1987 {
1988 unsigned long flags;
1989
1990 spin_lock_irqsave(&cmd->t_state_lock, flags);
1991 if (!atomic_read(&cmd->t_transport_timeout)) {
1992 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1993 return;
1994 }
1995 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
1996 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1997 return;
1998 }
1999
2000 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2001 &cmd->t_se_count);
2002 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2003 }
2004
2005 static inline u32 transport_lba_21(unsigned char *cdb)
2006 {
2007 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2008 }
2009
2010 static inline u32 transport_lba_32(unsigned char *cdb)
2011 {
2012 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2013 }
2014
2015 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2016 {
2017 unsigned int __v1, __v2;
2018
2019 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2020 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2021
2022 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2023 }
2024
2025 /*
2026 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2027 */
2028 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2029 {
2030 unsigned int __v1, __v2;
2031
2032 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2033 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2034
2035 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2036 }
2037
2038 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2039 {
2040 unsigned long flags;
2041
2042 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2043 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2044 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2045 }
2046
2047 /*
2048 * Called from interrupt context.
2049 */
2050 static void transport_task_timeout_handler(unsigned long data)
2051 {
2052 struct se_task *task = (struct se_task *)data;
2053 struct se_cmd *cmd = task->task_se_cmd;
2054 unsigned long flags;
2055
2056 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2057
2058 spin_lock_irqsave(&cmd->t_state_lock, flags);
2059
2060 /*
2061 * Determine if transport_complete_task() has already been called.
2062 */
2063 if (!(task->task_flags & TF_ACTIVE)) {
2064 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2065 task, cmd);
2066 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2067 return;
2068 }
2069
2070 atomic_inc(&cmd->t_se_count);
2071 atomic_inc(&cmd->t_transport_timeout);
2072 cmd->t_tasks_failed = 1;
2073
2074 task->task_flags |= TF_TIMEOUT;
2075 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2076 task->task_scsi_status = 1;
2077
2078 if (task->task_flags & TF_REQUEST_STOP) {
2079 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2080 " == 1\n", task, cmd);
2081 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2082 complete(&task->task_stop_comp);
2083 return;
2084 }
2085
2086 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2087 pr_debug("transport task: %p cmd: %p timeout non zero"
2088 " t_task_cdbs_left\n", task, cmd);
2089 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2090 return;
2091 }
2092 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2093 task, cmd);
2094
2095 INIT_WORK(&cmd->work, target_complete_failure_work);
2096 cmd->t_state = TRANSPORT_COMPLETE;
2097 atomic_set(&cmd->t_transport_active, 1);
2098 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2099
2100 queue_work(target_completion_wq, &cmd->work);
2101 }
2102
2103 static void transport_start_task_timer(struct se_task *task)
2104 {
2105 struct se_device *dev = task->task_se_cmd->se_dev;
2106 int timeout;
2107
2108 /*
2109 * If the task_timeout is disabled, exit now.
2110 */
2111 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
2112 if (!timeout)
2113 return;
2114
2115 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2116 task->task_timer.data = (unsigned long) task;
2117 task->task_timer.function = transport_task_timeout_handler;
2118 add_timer(&task->task_timer);
2119 }
2120
2121 static inline int transport_tcq_window_closed(struct se_device *dev)
2122 {
2123 if (dev->dev_tcq_window_closed++ <
2124 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2125 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2126 } else
2127 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2128
2129 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
2130 return 0;
2131 }
2132
2133 /*
2134 * Called from Fabric Module context from transport_execute_tasks()
2135 *
2136 * The return of this function determins if the tasks from struct se_cmd
2137 * get added to the execution queue in transport_execute_tasks(),
2138 * or are added to the delayed or ordered lists here.
2139 */
2140 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2141 {
2142 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2143 return 1;
2144 /*
2145 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2146 * to allow the passed struct se_cmd list of tasks to the front of the list.
2147 */
2148 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2149 atomic_inc(&cmd->se_dev->dev_hoq_count);
2150 smp_mb__after_atomic_inc();
2151 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2152 " 0x%02x, se_ordered_id: %u\n",
2153 cmd->t_task_cdb[0],
2154 cmd->se_ordered_id);
2155 return 1;
2156 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2157 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2158 list_add_tail(&cmd->se_ordered_node,
2159 &cmd->se_dev->ordered_cmd_list);
2160 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2161
2162 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2163 smp_mb__after_atomic_inc();
2164
2165 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2166 " list, se_ordered_id: %u\n",
2167 cmd->t_task_cdb[0],
2168 cmd->se_ordered_id);
2169 /*
2170 * Add ORDERED command to tail of execution queue if
2171 * no other older commands exist that need to be
2172 * completed first.
2173 */
2174 if (!atomic_read(&cmd->se_dev->simple_cmds))
2175 return 1;
2176 } else {
2177 /*
2178 * For SIMPLE and UNTAGGED Task Attribute commands
2179 */
2180 atomic_inc(&cmd->se_dev->simple_cmds);
2181 smp_mb__after_atomic_inc();
2182 }
2183 /*
2184 * Otherwise if one or more outstanding ORDERED task attribute exist,
2185 * add the dormant task(s) built for the passed struct se_cmd to the
2186 * execution queue and become in Active state for this struct se_device.
2187 */
2188 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2189 /*
2190 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2191 * will be drained upon completion of HEAD_OF_QUEUE task.
2192 */
2193 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2194 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2195 list_add_tail(&cmd->se_delayed_node,
2196 &cmd->se_dev->delayed_cmd_list);
2197 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2198
2199 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2200 " delayed CMD list, se_ordered_id: %u\n",
2201 cmd->t_task_cdb[0], cmd->sam_task_attr,
2202 cmd->se_ordered_id);
2203 /*
2204 * Return zero to let transport_execute_tasks() know
2205 * not to add the delayed tasks to the execution list.
2206 */
2207 return 0;
2208 }
2209 /*
2210 * Otherwise, no ORDERED task attributes exist..
2211 */
2212 return 1;
2213 }
2214
2215 /*
2216 * Called from fabric module context in transport_generic_new_cmd() and
2217 * transport_generic_process_write()
2218 */
2219 static int transport_execute_tasks(struct se_cmd *cmd)
2220 {
2221 int add_tasks;
2222
2223 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2224 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2225 transport_generic_request_failure(cmd, 0, 1);
2226 return 0;
2227 }
2228
2229 /*
2230 * Call transport_cmd_check_stop() to see if a fabric exception
2231 * has occurred that prevents execution.
2232 */
2233 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2234 /*
2235 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2236 * attribute for the tasks of the received struct se_cmd CDB
2237 */
2238 add_tasks = transport_execute_task_attr(cmd);
2239 if (!add_tasks)
2240 goto execute_tasks;
2241 /*
2242 * This calls transport_add_tasks_from_cmd() to handle
2243 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2244 * (if enabled) in __transport_add_task_to_execute_queue() and
2245 * transport_add_task_check_sam_attr().
2246 */
2247 transport_add_tasks_from_cmd(cmd);
2248 }
2249 /*
2250 * Kick the execution queue for the cmd associated struct se_device
2251 * storage object.
2252 */
2253 execute_tasks:
2254 __transport_execute_tasks(cmd->se_dev);
2255 return 0;
2256 }
2257
2258 /*
2259 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2260 * from struct se_device->execute_task_list and
2261 *
2262 * Called from transport_processing_thread()
2263 */
2264 static int __transport_execute_tasks(struct se_device *dev)
2265 {
2266 int error;
2267 struct se_cmd *cmd = NULL;
2268 struct se_task *task = NULL;
2269 unsigned long flags;
2270
2271 /*
2272 * Check if there is enough room in the device and HBA queue to send
2273 * struct se_tasks to the selected transport.
2274 */
2275 check_depth:
2276 if (!atomic_read(&dev->depth_left))
2277 return transport_tcq_window_closed(dev);
2278
2279 dev->dev_tcq_window_closed = 0;
2280
2281 spin_lock_irq(&dev->execute_task_lock);
2282 if (list_empty(&dev->execute_task_list)) {
2283 spin_unlock_irq(&dev->execute_task_lock);
2284 return 0;
2285 }
2286 task = list_first_entry(&dev->execute_task_list,
2287 struct se_task, t_execute_list);
2288 __transport_remove_task_from_execute_queue(task, dev);
2289 spin_unlock_irq(&dev->execute_task_lock);
2290
2291 atomic_dec(&dev->depth_left);
2292
2293 cmd = task->task_se_cmd;
2294
2295 spin_lock_irqsave(&cmd->t_state_lock, flags);
2296 task->task_flags |= (TF_ACTIVE | TF_SENT);
2297 atomic_inc(&cmd->t_task_cdbs_sent);
2298
2299 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2300 cmd->t_task_list_num)
2301 atomic_set(&cmd->transport_sent, 1);
2302
2303 transport_start_task_timer(task);
2304 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2305 /*
2306 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2307 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2308 * struct se_subsystem_api->do_task() caller below.
2309 */
2310 if (cmd->transport_emulate_cdb) {
2311 error = cmd->transport_emulate_cdb(cmd);
2312 if (error != 0) {
2313 cmd->transport_error_status = error;
2314 spin_lock_irqsave(&cmd->t_state_lock, flags);
2315 task->task_flags &= ~TF_ACTIVE;
2316 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2317 del_timer_sync(&task->task_timer);
2318 atomic_set(&cmd->transport_sent, 0);
2319 transport_stop_tasks_for_cmd(cmd);
2320 atomic_inc(&dev->depth_left);
2321 transport_generic_request_failure(cmd, 0, 1);
2322 goto check_depth;
2323 }
2324 /*
2325 * Handle the successful completion for transport_emulate_cdb()
2326 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2327 * Otherwise the caller is expected to complete the task with
2328 * proper status.
2329 */
2330 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2331 cmd->scsi_status = SAM_STAT_GOOD;
2332 task->task_scsi_status = GOOD;
2333 transport_complete_task(task, 1);
2334 }
2335 } else {
2336 /*
2337 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2338 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2339 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2340 * LUN emulation code.
2341 *
2342 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2343 * call ->do_task() directly and let the underlying TCM subsystem plugin
2344 * code handle the CDB emulation.
2345 */
2346 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2347 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2348 error = transport_emulate_control_cdb(task);
2349 else
2350 error = dev->transport->do_task(task);
2351
2352 if (error != 0) {
2353 cmd->transport_error_status = error;
2354 spin_lock_irqsave(&cmd->t_state_lock, flags);
2355 task->task_flags &= ~TF_ACTIVE;
2356 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2357 del_timer_sync(&task->task_timer);
2358 atomic_set(&cmd->transport_sent, 0);
2359 transport_stop_tasks_for_cmd(cmd);
2360 atomic_inc(&dev->depth_left);
2361 transport_generic_request_failure(cmd, 0, 1);
2362 }
2363 }
2364
2365 goto check_depth;
2366
2367 return 0;
2368 }
2369
2370 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2371 {
2372 unsigned long flags;
2373 /*
2374 * Any unsolicited data will get dumped for failed command inside of
2375 * the fabric plugin
2376 */
2377 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2378 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2379 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2380 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2381 }
2382
2383 static inline u32 transport_get_sectors_6(
2384 unsigned char *cdb,
2385 struct se_cmd *cmd,
2386 int *ret)
2387 {
2388 struct se_device *dev = cmd->se_dev;
2389
2390 /*
2391 * Assume TYPE_DISK for non struct se_device objects.
2392 * Use 8-bit sector value.
2393 */
2394 if (!dev)
2395 goto type_disk;
2396
2397 /*
2398 * Use 24-bit allocation length for TYPE_TAPE.
2399 */
2400 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2401 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2402
2403 /*
2404 * Everything else assume TYPE_DISK Sector CDB location.
2405 * Use 8-bit sector value.
2406 */
2407 type_disk:
2408 return (u32)cdb[4];
2409 }
2410
2411 static inline u32 transport_get_sectors_10(
2412 unsigned char *cdb,
2413 struct se_cmd *cmd,
2414 int *ret)
2415 {
2416 struct se_device *dev = cmd->se_dev;
2417
2418 /*
2419 * Assume TYPE_DISK for non struct se_device objects.
2420 * Use 16-bit sector value.
2421 */
2422 if (!dev)
2423 goto type_disk;
2424
2425 /*
2426 * XXX_10 is not defined in SSC, throw an exception
2427 */
2428 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2429 *ret = -EINVAL;
2430 return 0;
2431 }
2432
2433 /*
2434 * Everything else assume TYPE_DISK Sector CDB location.
2435 * Use 16-bit sector value.
2436 */
2437 type_disk:
2438 return (u32)(cdb[7] << 8) + cdb[8];
2439 }
2440
2441 static inline u32 transport_get_sectors_12(
2442 unsigned char *cdb,
2443 struct se_cmd *cmd,
2444 int *ret)
2445 {
2446 struct se_device *dev = cmd->se_dev;
2447
2448 /*
2449 * Assume TYPE_DISK for non struct se_device objects.
2450 * Use 32-bit sector value.
2451 */
2452 if (!dev)
2453 goto type_disk;
2454
2455 /*
2456 * XXX_12 is not defined in SSC, throw an exception
2457 */
2458 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2459 *ret = -EINVAL;
2460 return 0;
2461 }
2462
2463 /*
2464 * Everything else assume TYPE_DISK Sector CDB location.
2465 * Use 32-bit sector value.
2466 */
2467 type_disk:
2468 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2469 }
2470
2471 static inline u32 transport_get_sectors_16(
2472 unsigned char *cdb,
2473 struct se_cmd *cmd,
2474 int *ret)
2475 {
2476 struct se_device *dev = cmd->se_dev;
2477
2478 /*
2479 * Assume TYPE_DISK for non struct se_device objects.
2480 * Use 32-bit sector value.
2481 */
2482 if (!dev)
2483 goto type_disk;
2484
2485 /*
2486 * Use 24-bit allocation length for TYPE_TAPE.
2487 */
2488 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2489 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2490
2491 type_disk:
2492 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2493 (cdb[12] << 8) + cdb[13];
2494 }
2495
2496 /*
2497 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2498 */
2499 static inline u32 transport_get_sectors_32(
2500 unsigned char *cdb,
2501 struct se_cmd *cmd,
2502 int *ret)
2503 {
2504 /*
2505 * Assume TYPE_DISK for non struct se_device objects.
2506 * Use 32-bit sector value.
2507 */
2508 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2509 (cdb[30] << 8) + cdb[31];
2510
2511 }
2512
2513 static inline u32 transport_get_size(
2514 u32 sectors,
2515 unsigned char *cdb,
2516 struct se_cmd *cmd)
2517 {
2518 struct se_device *dev = cmd->se_dev;
2519
2520 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2521 if (cdb[1] & 1) { /* sectors */
2522 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2523 } else /* bytes */
2524 return sectors;
2525 }
2526 #if 0
2527 pr_debug("Returning block_size: %u, sectors: %u == %u for"
2528 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2529 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2530 dev->transport->name);
2531 #endif
2532 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2533 }
2534
2535 static void transport_xor_callback(struct se_cmd *cmd)
2536 {
2537 unsigned char *buf, *addr;
2538 struct scatterlist *sg;
2539 unsigned int offset;
2540 int i;
2541 int count;
2542 /*
2543 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2544 *
2545 * 1) read the specified logical block(s);
2546 * 2) transfer logical blocks from the data-out buffer;
2547 * 3) XOR the logical blocks transferred from the data-out buffer with
2548 * the logical blocks read, storing the resulting XOR data in a buffer;
2549 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2550 * blocks transferred from the data-out buffer; and
2551 * 5) transfer the resulting XOR data to the data-in buffer.
2552 */
2553 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2554 if (!buf) {
2555 pr_err("Unable to allocate xor_callback buf\n");
2556 return;
2557 }
2558 /*
2559 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2560 * into the locally allocated *buf
2561 */
2562 sg_copy_to_buffer(cmd->t_data_sg,
2563 cmd->t_data_nents,
2564 buf,
2565 cmd->data_length);
2566
2567 /*
2568 * Now perform the XOR against the BIDI read memory located at
2569 * cmd->t_mem_bidi_list
2570 */
2571
2572 offset = 0;
2573 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2574 addr = kmap_atomic(sg_page(sg), KM_USER0);
2575 if (!addr)
2576 goto out;
2577
2578 for (i = 0; i < sg->length; i++)
2579 *(addr + sg->offset + i) ^= *(buf + offset + i);
2580
2581 offset += sg->length;
2582 kunmap_atomic(addr, KM_USER0);
2583 }
2584
2585 out:
2586 kfree(buf);
2587 }
2588
2589 /*
2590 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2591 */
2592 static int transport_get_sense_data(struct se_cmd *cmd)
2593 {
2594 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2595 struct se_device *dev = cmd->se_dev;
2596 struct se_task *task = NULL, *task_tmp;
2597 unsigned long flags;
2598 u32 offset = 0;
2599
2600 WARN_ON(!cmd->se_lun);
2601
2602 if (!dev)
2603 return 0;
2604
2605 spin_lock_irqsave(&cmd->t_state_lock, flags);
2606 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2607 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2608 return 0;
2609 }
2610
2611 list_for_each_entry_safe(task, task_tmp,
2612 &cmd->t_task_list, t_list) {
2613 if (!task->task_sense)
2614 continue;
2615
2616 if (!dev->transport->get_sense_buffer) {
2617 pr_err("dev->transport->get_sense_buffer"
2618 " is NULL\n");
2619 continue;
2620 }
2621
2622 sense_buffer = dev->transport->get_sense_buffer(task);
2623 if (!sense_buffer) {
2624 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2625 " sense buffer for task with sense\n",
2626 cmd->se_tfo->get_task_tag(cmd), task);
2627 continue;
2628 }
2629 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2630
2631 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2632 TRANSPORT_SENSE_BUFFER);
2633
2634 memcpy(&buffer[offset], sense_buffer,
2635 TRANSPORT_SENSE_BUFFER);
2636 cmd->scsi_status = task->task_scsi_status;
2637 /* Automatically padded */
2638 cmd->scsi_sense_length =
2639 (TRANSPORT_SENSE_BUFFER + offset);
2640
2641 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2642 " and sense\n",
2643 dev->se_hba->hba_id, dev->transport->name,
2644 cmd->scsi_status);
2645 return 0;
2646 }
2647 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2648
2649 return -1;
2650 }
2651
2652 static int
2653 transport_handle_reservation_conflict(struct se_cmd *cmd)
2654 {
2655 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2656 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2657 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2658 /*
2659 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2660 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2661 * CONFLICT STATUS.
2662 *
2663 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2664 */
2665 if (cmd->se_sess &&
2666 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2667 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2668 cmd->orig_fe_lun, 0x2C,
2669 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2670 return -EINVAL;
2671 }
2672
2673 static inline long long transport_dev_end_lba(struct se_device *dev)
2674 {
2675 return dev->transport->get_blocks(dev) + 1;
2676 }
2677
2678 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2679 {
2680 struct se_device *dev = cmd->se_dev;
2681 u32 sectors;
2682
2683 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2684 return 0;
2685
2686 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2687
2688 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2689 pr_err("LBA: %llu Sectors: %u exceeds"
2690 " transport_dev_end_lba(): %llu\n",
2691 cmd->t_task_lba, sectors,
2692 transport_dev_end_lba(dev));
2693 return -EINVAL;
2694 }
2695
2696 return 0;
2697 }
2698
2699 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2700 {
2701 /*
2702 * Determine if the received WRITE_SAME is used to for direct
2703 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2704 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2705 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2706 */
2707 int passthrough = (dev->transport->transport_type ==
2708 TRANSPORT_PLUGIN_PHBA_PDEV);
2709
2710 if (!passthrough) {
2711 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2712 pr_err("WRITE_SAME PBDATA and LBDATA"
2713 " bits not supported for Block Discard"
2714 " Emulation\n");
2715 return -ENOSYS;
2716 }
2717 /*
2718 * Currently for the emulated case we only accept
2719 * tpws with the UNMAP=1 bit set.
2720 */
2721 if (!(flags[0] & 0x08)) {
2722 pr_err("WRITE_SAME w/o UNMAP bit not"
2723 " supported for Block Discard Emulation\n");
2724 return -ENOSYS;
2725 }
2726 }
2727
2728 return 0;
2729 }
2730
2731 /* transport_generic_cmd_sequencer():
2732 *
2733 * Generic Command Sequencer that should work for most DAS transport
2734 * drivers.
2735 *
2736 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2737 * RX Thread.
2738 *
2739 * FIXME: Need to support other SCSI OPCODES where as well.
2740 */
2741 static int transport_generic_cmd_sequencer(
2742 struct se_cmd *cmd,
2743 unsigned char *cdb)
2744 {
2745 struct se_device *dev = cmd->se_dev;
2746 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2747 int ret = 0, sector_ret = 0, passthrough;
2748 u32 sectors = 0, size = 0, pr_reg_type = 0;
2749 u16 service_action;
2750 u8 alua_ascq = 0;
2751 /*
2752 * Check for an existing UNIT ATTENTION condition
2753 */
2754 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2755 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2756 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2757 return -EINVAL;
2758 }
2759 /*
2760 * Check status of Asymmetric Logical Unit Assignment port
2761 */
2762 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2763 if (ret != 0) {
2764 /*
2765 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2766 * The ALUA additional sense code qualifier (ASCQ) is determined
2767 * by the ALUA primary or secondary access state..
2768 */
2769 if (ret > 0) {
2770 #if 0
2771 pr_debug("[%s]: ALUA TG Port not available,"
2772 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2773 cmd->se_tfo->get_fabric_name(), alua_ascq);
2774 #endif
2775 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2776 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2777 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2778 return -EINVAL;
2779 }
2780 goto out_invalid_cdb_field;
2781 }
2782 /*
2783 * Check status for SPC-3 Persistent Reservations
2784 */
2785 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2786 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2787 cmd, cdb, pr_reg_type) != 0)
2788 return transport_handle_reservation_conflict(cmd);
2789 /*
2790 * This means the CDB is allowed for the SCSI Initiator port
2791 * when said port is *NOT* holding the legacy SPC-2 or
2792 * SPC-3 Persistent Reservation.
2793 */
2794 }
2795
2796 switch (cdb[0]) {
2797 case READ_6:
2798 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2799 if (sector_ret)
2800 goto out_unsupported_cdb;
2801 size = transport_get_size(sectors, cdb, cmd);
2802 cmd->t_task_lba = transport_lba_21(cdb);
2803 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2804 break;
2805 case READ_10:
2806 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2807 if (sector_ret)
2808 goto out_unsupported_cdb;
2809 size = transport_get_size(sectors, cdb, cmd);
2810 cmd->t_task_lba = transport_lba_32(cdb);
2811 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2812 break;
2813 case READ_12:
2814 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2815 if (sector_ret)
2816 goto out_unsupported_cdb;
2817 size = transport_get_size(sectors, cdb, cmd);
2818 cmd->t_task_lba = transport_lba_32(cdb);
2819 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2820 break;
2821 case READ_16:
2822 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2823 if (sector_ret)
2824 goto out_unsupported_cdb;
2825 size = transport_get_size(sectors, cdb, cmd);
2826 cmd->t_task_lba = transport_lba_64(cdb);
2827 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2828 break;
2829 case WRITE_6:
2830 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2831 if (sector_ret)
2832 goto out_unsupported_cdb;
2833 size = transport_get_size(sectors, cdb, cmd);
2834 cmd->t_task_lba = transport_lba_21(cdb);
2835 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2836 break;
2837 case WRITE_10:
2838 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2839 if (sector_ret)
2840 goto out_unsupported_cdb;
2841 size = transport_get_size(sectors, cdb, cmd);
2842 cmd->t_task_lba = transport_lba_32(cdb);
2843 cmd->t_tasks_fua = (cdb[1] & 0x8);
2844 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2845 break;
2846 case WRITE_12:
2847 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2848 if (sector_ret)
2849 goto out_unsupported_cdb;
2850 size = transport_get_size(sectors, cdb, cmd);
2851 cmd->t_task_lba = transport_lba_32(cdb);
2852 cmd->t_tasks_fua = (cdb[1] & 0x8);
2853 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2854 break;
2855 case WRITE_16:
2856 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2857 if (sector_ret)
2858 goto out_unsupported_cdb;
2859 size = transport_get_size(sectors, cdb, cmd);
2860 cmd->t_task_lba = transport_lba_64(cdb);
2861 cmd->t_tasks_fua = (cdb[1] & 0x8);
2862 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2863 break;
2864 case XDWRITEREAD_10:
2865 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2866 !(cmd->t_tasks_bidi))
2867 goto out_invalid_cdb_field;
2868 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2869 if (sector_ret)
2870 goto out_unsupported_cdb;
2871 size = transport_get_size(sectors, cdb, cmd);
2872 cmd->t_task_lba = transport_lba_32(cdb);
2873 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2874
2875 if (dev->transport->transport_type ==
2876 TRANSPORT_PLUGIN_PHBA_PDEV)
2877 goto out_unsupported_cdb;
2878 /*
2879 * Setup BIDI XOR callback to be run after I/O completion.
2880 */
2881 cmd->transport_complete_callback = &transport_xor_callback;
2882 cmd->t_tasks_fua = (cdb[1] & 0x8);
2883 break;
2884 case VARIABLE_LENGTH_CMD:
2885 service_action = get_unaligned_be16(&cdb[8]);
2886 /*
2887 * Determine if this is TCM/PSCSI device and we should disable
2888 * internal emulation for this CDB.
2889 */
2890 passthrough = (dev->transport->transport_type ==
2891 TRANSPORT_PLUGIN_PHBA_PDEV);
2892
2893 switch (service_action) {
2894 case XDWRITEREAD_32:
2895 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2896 if (sector_ret)
2897 goto out_unsupported_cdb;
2898 size = transport_get_size(sectors, cdb, cmd);
2899 /*
2900 * Use WRITE_32 and READ_32 opcodes for the emulated
2901 * XDWRITE_READ_32 logic.
2902 */
2903 cmd->t_task_lba = transport_lba_64_ext(cdb);
2904 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2905
2906 if (passthrough)
2907 goto out_unsupported_cdb;
2908 /*
2909 * Setup BIDI XOR callback to be run during after I/O
2910 * completion.
2911 */
2912 cmd->transport_complete_callback = &transport_xor_callback;
2913 cmd->t_tasks_fua = (cdb[10] & 0x8);
2914 break;
2915 case WRITE_SAME_32:
2916 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2917 if (sector_ret)
2918 goto out_unsupported_cdb;
2919
2920 if (sectors)
2921 size = transport_get_size(1, cdb, cmd);
2922 else {
2923 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2924 " supported\n");
2925 goto out_invalid_cdb_field;
2926 }
2927
2928 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2929 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2930
2931 if (target_check_write_same_discard(&cdb[10], dev) < 0)
2932 goto out_invalid_cdb_field;
2933
2934 break;
2935 default:
2936 pr_err("VARIABLE_LENGTH_CMD service action"
2937 " 0x%04x not supported\n", service_action);
2938 goto out_unsupported_cdb;
2939 }
2940 break;
2941 case MAINTENANCE_IN:
2942 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2943 /* MAINTENANCE_IN from SCC-2 */
2944 /*
2945 * Check for emulated MI_REPORT_TARGET_PGS.
2946 */
2947 if (cdb[1] == MI_REPORT_TARGET_PGS) {
2948 cmd->transport_emulate_cdb =
2949 (su_dev->t10_alua.alua_type ==
2950 SPC3_ALUA_EMULATED) ?
2951 core_emulate_report_target_port_groups :
2952 NULL;
2953 }
2954 size = (cdb[6] << 24) | (cdb[7] << 16) |
2955 (cdb[8] << 8) | cdb[9];
2956 } else {
2957 /* GPCMD_SEND_KEY from multi media commands */
2958 size = (cdb[8] << 8) + cdb[9];
2959 }
2960 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2961 break;
2962 case MODE_SELECT:
2963 size = cdb[4];
2964 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2965 break;
2966 case MODE_SELECT_10:
2967 size = (cdb[7] << 8) + cdb[8];
2968 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2969 break;
2970 case MODE_SENSE:
2971 size = cdb[4];
2972 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2973 break;
2974 case MODE_SENSE_10:
2975 case GPCMD_READ_BUFFER_CAPACITY:
2976 case GPCMD_SEND_OPC:
2977 case LOG_SELECT:
2978 case LOG_SENSE:
2979 size = (cdb[7] << 8) + cdb[8];
2980 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2981 break;
2982 case READ_BLOCK_LIMITS:
2983 size = READ_BLOCK_LEN;
2984 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2985 break;
2986 case GPCMD_GET_CONFIGURATION:
2987 case GPCMD_READ_FORMAT_CAPACITIES:
2988 case GPCMD_READ_DISC_INFO:
2989 case GPCMD_READ_TRACK_RZONE_INFO:
2990 size = (cdb[7] << 8) + cdb[8];
2991 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2992 break;
2993 case PERSISTENT_RESERVE_IN:
2994 case PERSISTENT_RESERVE_OUT:
2995 cmd->transport_emulate_cdb =
2996 (su_dev->t10_pr.res_type ==
2997 SPC3_PERSISTENT_RESERVATIONS) ?
2998 core_scsi3_emulate_pr : NULL;
2999 size = (cdb[7] << 8) + cdb[8];
3000 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3001 break;
3002 case GPCMD_MECHANISM_STATUS:
3003 case GPCMD_READ_DVD_STRUCTURE:
3004 size = (cdb[8] << 8) + cdb[9];
3005 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3006 break;
3007 case READ_POSITION:
3008 size = READ_POSITION_LEN;
3009 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3010 break;
3011 case MAINTENANCE_OUT:
3012 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3013 /* MAINTENANCE_OUT from SCC-2
3014 *
3015 * Check for emulated MO_SET_TARGET_PGS.
3016 */
3017 if (cdb[1] == MO_SET_TARGET_PGS) {
3018 cmd->transport_emulate_cdb =
3019 (su_dev->t10_alua.alua_type ==
3020 SPC3_ALUA_EMULATED) ?
3021 core_emulate_set_target_port_groups :
3022 NULL;
3023 }
3024
3025 size = (cdb[6] << 24) | (cdb[7] << 16) |
3026 (cdb[8] << 8) | cdb[9];
3027 } else {
3028 /* GPCMD_REPORT_KEY from multi media commands */
3029 size = (cdb[8] << 8) + cdb[9];
3030 }
3031 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3032 break;
3033 case INQUIRY:
3034 size = (cdb[3] << 8) + cdb[4];
3035 /*
3036 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3037 * See spc4r17 section 5.3
3038 */
3039 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3040 cmd->sam_task_attr = MSG_HEAD_TAG;
3041 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3042 break;
3043 case READ_BUFFER:
3044 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3045 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3046 break;
3047 case READ_CAPACITY:
3048 size = READ_CAP_LEN;
3049 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3050 break;
3051 case READ_MEDIA_SERIAL_NUMBER:
3052 case SECURITY_PROTOCOL_IN:
3053 case SECURITY_PROTOCOL_OUT:
3054 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3055 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3056 break;
3057 case SERVICE_ACTION_IN:
3058 case ACCESS_CONTROL_IN:
3059 case ACCESS_CONTROL_OUT:
3060 case EXTENDED_COPY:
3061 case READ_ATTRIBUTE:
3062 case RECEIVE_COPY_RESULTS:
3063 case WRITE_ATTRIBUTE:
3064 size = (cdb[10] << 24) | (cdb[11] << 16) |
3065 (cdb[12] << 8) | cdb[13];
3066 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3067 break;
3068 case RECEIVE_DIAGNOSTIC:
3069 case SEND_DIAGNOSTIC:
3070 size = (cdb[3] << 8) | cdb[4];
3071 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3072 break;
3073 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3074 #if 0
3075 case GPCMD_READ_CD:
3076 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3077 size = (2336 * sectors);
3078 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3079 break;
3080 #endif
3081 case READ_TOC:
3082 size = cdb[8];
3083 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3084 break;
3085 case REQUEST_SENSE:
3086 size = cdb[4];
3087 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3088 break;
3089 case READ_ELEMENT_STATUS:
3090 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3091 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3092 break;
3093 case WRITE_BUFFER:
3094 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3095 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3096 break;
3097 case RESERVE:
3098 case RESERVE_10:
3099 /*
3100 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3101 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3102 */
3103 if (cdb[0] == RESERVE_10)
3104 size = (cdb[7] << 8) | cdb[8];
3105 else
3106 size = cmd->data_length;
3107
3108 /*
3109 * Setup the legacy emulated handler for SPC-2 and
3110 * >= SPC-3 compatible reservation handling (CRH=1)
3111 * Otherwise, we assume the underlying SCSI logic is
3112 * is running in SPC_PASSTHROUGH, and wants reservations
3113 * emulation disabled.
3114 */
3115 cmd->transport_emulate_cdb =
3116 (su_dev->t10_pr.res_type !=
3117 SPC_PASSTHROUGH) ?
3118 core_scsi2_emulate_crh : NULL;
3119 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3120 break;
3121 case RELEASE:
3122 case RELEASE_10:
3123 /*
3124 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3125 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3126 */
3127 if (cdb[0] == RELEASE_10)
3128 size = (cdb[7] << 8) | cdb[8];
3129 else
3130 size = cmd->data_length;
3131
3132 cmd->transport_emulate_cdb =
3133 (su_dev->t10_pr.res_type !=
3134 SPC_PASSTHROUGH) ?
3135 core_scsi2_emulate_crh : NULL;
3136 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3137 break;
3138 case SYNCHRONIZE_CACHE:
3139 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3140 /*
3141 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3142 */
3143 if (cdb[0] == SYNCHRONIZE_CACHE) {
3144 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3145 cmd->t_task_lba = transport_lba_32(cdb);
3146 } else {
3147 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3148 cmd->t_task_lba = transport_lba_64(cdb);
3149 }
3150 if (sector_ret)
3151 goto out_unsupported_cdb;
3152
3153 size = transport_get_size(sectors, cdb, cmd);
3154 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3155
3156 /*
3157 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3158 */
3159 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3160 break;
3161 /*
3162 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3163 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3164 */
3165 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3166 /*
3167 * Check to ensure that LBA + Range does not exceed past end of
3168 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3169 */
3170 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3171 if (transport_cmd_get_valid_sectors(cmd) < 0)
3172 goto out_invalid_cdb_field;
3173 }
3174 break;
3175 case UNMAP:
3176 size = get_unaligned_be16(&cdb[7]);
3177 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3178 break;
3179 case WRITE_SAME_16:
3180 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3181 if (sector_ret)
3182 goto out_unsupported_cdb;
3183
3184 if (sectors)
3185 size = transport_get_size(1, cdb, cmd);
3186 else {
3187 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3188 goto out_invalid_cdb_field;
3189 }
3190
3191 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3192 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3193
3194 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3195 goto out_invalid_cdb_field;
3196 break;
3197 case WRITE_SAME:
3198 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3199 if (sector_ret)
3200 goto out_unsupported_cdb;
3201
3202 if (sectors)
3203 size = transport_get_size(1, cdb, cmd);
3204 else {
3205 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3206 goto out_invalid_cdb_field;
3207 }
3208
3209 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3210 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3211 /*
3212 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3213 * of byte 1 bit 3 UNMAP instead of original reserved field
3214 */
3215 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3216 goto out_invalid_cdb_field;
3217 break;
3218 case ALLOW_MEDIUM_REMOVAL:
3219 case GPCMD_CLOSE_TRACK:
3220 case ERASE:
3221 case INITIALIZE_ELEMENT_STATUS:
3222 case GPCMD_LOAD_UNLOAD:
3223 case REZERO_UNIT:
3224 case SEEK_10:
3225 case GPCMD_SET_SPEED:
3226 case SPACE:
3227 case START_STOP:
3228 case TEST_UNIT_READY:
3229 case VERIFY:
3230 case WRITE_FILEMARKS:
3231 case MOVE_MEDIUM:
3232 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3233 break;
3234 case REPORT_LUNS:
3235 cmd->transport_emulate_cdb =
3236 transport_core_report_lun_response;
3237 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3238 /*
3239 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3240 * See spc4r17 section 5.3
3241 */
3242 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3243 cmd->sam_task_attr = MSG_HEAD_TAG;
3244 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3245 break;
3246 default:
3247 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3248 " 0x%02x, sending CHECK_CONDITION.\n",
3249 cmd->se_tfo->get_fabric_name(), cdb[0]);
3250 goto out_unsupported_cdb;
3251 }
3252
3253 if (size != cmd->data_length) {
3254 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3255 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3256 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3257 cmd->data_length, size, cdb[0]);
3258
3259 cmd->cmd_spdtl = size;
3260
3261 if (cmd->data_direction == DMA_TO_DEVICE) {
3262 pr_err("Rejecting underflow/overflow"
3263 " WRITE data\n");
3264 goto out_invalid_cdb_field;
3265 }
3266 /*
3267 * Reject READ_* or WRITE_* with overflow/underflow for
3268 * type SCF_SCSI_DATA_SG_IO_CDB.
3269 */
3270 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3271 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3272 " CDB on non 512-byte sector setup subsystem"
3273 " plugin: %s\n", dev->transport->name);
3274 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3275 goto out_invalid_cdb_field;
3276 }
3277
3278 if (size > cmd->data_length) {
3279 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3280 cmd->residual_count = (size - cmd->data_length);
3281 } else {
3282 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3283 cmd->residual_count = (cmd->data_length - size);
3284 }
3285 cmd->data_length = size;
3286 }
3287
3288 /* Let's limit control cdbs to a page, for simplicity's sake. */
3289 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3290 size > PAGE_SIZE)
3291 goto out_invalid_cdb_field;
3292
3293 transport_set_supported_SAM_opcode(cmd);
3294 return ret;
3295
3296 out_unsupported_cdb:
3297 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3298 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3299 return -EINVAL;
3300 out_invalid_cdb_field:
3301 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3302 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3303 return -EINVAL;
3304 }
3305
3306 /*
3307 * Called from I/O completion to determine which dormant/delayed
3308 * and ordered cmds need to have their tasks added to the execution queue.
3309 */
3310 static void transport_complete_task_attr(struct se_cmd *cmd)
3311 {
3312 struct se_device *dev = cmd->se_dev;
3313 struct se_cmd *cmd_p, *cmd_tmp;
3314 int new_active_tasks = 0;
3315
3316 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3317 atomic_dec(&dev->simple_cmds);
3318 smp_mb__after_atomic_dec();
3319 dev->dev_cur_ordered_id++;
3320 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3321 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3322 cmd->se_ordered_id);
3323 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3324 atomic_dec(&dev->dev_hoq_count);
3325 smp_mb__after_atomic_dec();
3326 dev->dev_cur_ordered_id++;
3327 pr_debug("Incremented dev_cur_ordered_id: %u for"
3328 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3329 cmd->se_ordered_id);
3330 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3331 spin_lock(&dev->ordered_cmd_lock);
3332 list_del(&cmd->se_ordered_node);
3333 atomic_dec(&dev->dev_ordered_sync);
3334 smp_mb__after_atomic_dec();
3335 spin_unlock(&dev->ordered_cmd_lock);
3336
3337 dev->dev_cur_ordered_id++;
3338 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3339 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3340 }
3341 /*
3342 * Process all commands up to the last received
3343 * ORDERED task attribute which requires another blocking
3344 * boundary
3345 */
3346 spin_lock(&dev->delayed_cmd_lock);
3347 list_for_each_entry_safe(cmd_p, cmd_tmp,
3348 &dev->delayed_cmd_list, se_delayed_node) {
3349
3350 list_del(&cmd_p->se_delayed_node);
3351 spin_unlock(&dev->delayed_cmd_lock);
3352
3353 pr_debug("Calling add_tasks() for"
3354 " cmd_p: 0x%02x Task Attr: 0x%02x"
3355 " Dormant -> Active, se_ordered_id: %u\n",
3356 cmd_p->t_task_cdb[0],
3357 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3358
3359 transport_add_tasks_from_cmd(cmd_p);
3360 new_active_tasks++;
3361
3362 spin_lock(&dev->delayed_cmd_lock);
3363 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3364 break;
3365 }
3366 spin_unlock(&dev->delayed_cmd_lock);
3367 /*
3368 * If new tasks have become active, wake up the transport thread
3369 * to do the processing of the Active tasks.
3370 */
3371 if (new_active_tasks != 0)
3372 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3373 }
3374
3375 static void transport_complete_qf(struct se_cmd *cmd)
3376 {
3377 int ret = 0;
3378
3379 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3380 transport_complete_task_attr(cmd);
3381
3382 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3383 ret = cmd->se_tfo->queue_status(cmd);
3384 if (ret)
3385 goto out;
3386 }
3387
3388 switch (cmd->data_direction) {
3389 case DMA_FROM_DEVICE:
3390 ret = cmd->se_tfo->queue_data_in(cmd);
3391 break;
3392 case DMA_TO_DEVICE:
3393 if (cmd->t_bidi_data_sg) {
3394 ret = cmd->se_tfo->queue_data_in(cmd);
3395 if (ret < 0)
3396 break;
3397 }
3398 /* Fall through for DMA_TO_DEVICE */
3399 case DMA_NONE:
3400 ret = cmd->se_tfo->queue_status(cmd);
3401 break;
3402 default:
3403 break;
3404 }
3405
3406 out:
3407 if (ret < 0) {
3408 transport_handle_queue_full(cmd, cmd->se_dev);
3409 return;
3410 }
3411 transport_lun_remove_cmd(cmd);
3412 transport_cmd_check_stop_to_fabric(cmd);
3413 }
3414
3415 static void transport_handle_queue_full(
3416 struct se_cmd *cmd,
3417 struct se_device *dev)
3418 {
3419 spin_lock_irq(&dev->qf_cmd_lock);
3420 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3421 atomic_inc(&dev->dev_qf_count);
3422 smp_mb__after_atomic_inc();
3423 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3424
3425 schedule_work(&cmd->se_dev->qf_work_queue);
3426 }
3427
3428 static void target_complete_ok_work(struct work_struct *work)
3429 {
3430 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3431 int reason = 0, ret;
3432
3433 /*
3434 * Check if we need to move delayed/dormant tasks from cmds on the
3435 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3436 * Attribute.
3437 */
3438 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3439 transport_complete_task_attr(cmd);
3440 /*
3441 * Check to schedule QUEUE_FULL work, or execute an existing
3442 * cmd->transport_qf_callback()
3443 */
3444 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3445 schedule_work(&cmd->se_dev->qf_work_queue);
3446
3447 /*
3448 * Check if we need to retrieve a sense buffer from
3449 * the struct se_cmd in question.
3450 */
3451 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3452 if (transport_get_sense_data(cmd) < 0)
3453 reason = TCM_NON_EXISTENT_LUN;
3454
3455 /*
3456 * Only set when an struct se_task->task_scsi_status returned
3457 * a non GOOD status.
3458 */
3459 if (cmd->scsi_status) {
3460 ret = transport_send_check_condition_and_sense(
3461 cmd, reason, 1);
3462 if (ret == -EAGAIN)
3463 goto queue_full;
3464
3465 transport_lun_remove_cmd(cmd);
3466 transport_cmd_check_stop_to_fabric(cmd);
3467 return;
3468 }
3469 }
3470 /*
3471 * Check for a callback, used by amongst other things
3472 * XDWRITE_READ_10 emulation.
3473 */
3474 if (cmd->transport_complete_callback)
3475 cmd->transport_complete_callback(cmd);
3476
3477 switch (cmd->data_direction) {
3478 case DMA_FROM_DEVICE:
3479 spin_lock(&cmd->se_lun->lun_sep_lock);
3480 if (cmd->se_lun->lun_sep) {
3481 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3482 cmd->data_length;
3483 }
3484 spin_unlock(&cmd->se_lun->lun_sep_lock);
3485
3486 ret = cmd->se_tfo->queue_data_in(cmd);
3487 if (ret == -EAGAIN)
3488 goto queue_full;
3489 break;
3490 case DMA_TO_DEVICE:
3491 spin_lock(&cmd->se_lun->lun_sep_lock);
3492 if (cmd->se_lun->lun_sep) {
3493 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3494 cmd->data_length;
3495 }
3496 spin_unlock(&cmd->se_lun->lun_sep_lock);
3497 /*
3498 * Check if we need to send READ payload for BIDI-COMMAND
3499 */
3500 if (cmd->t_bidi_data_sg) {
3501 spin_lock(&cmd->se_lun->lun_sep_lock);
3502 if (cmd->se_lun->lun_sep) {
3503 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3504 cmd->data_length;
3505 }
3506 spin_unlock(&cmd->se_lun->lun_sep_lock);
3507 ret = cmd->se_tfo->queue_data_in(cmd);
3508 if (ret == -EAGAIN)
3509 goto queue_full;
3510 break;
3511 }
3512 /* Fall through for DMA_TO_DEVICE */
3513 case DMA_NONE:
3514 ret = cmd->se_tfo->queue_status(cmd);
3515 if (ret == -EAGAIN)
3516 goto queue_full;
3517 break;
3518 default:
3519 break;
3520 }
3521
3522 transport_lun_remove_cmd(cmd);
3523 transport_cmd_check_stop_to_fabric(cmd);
3524 return;
3525
3526 queue_full:
3527 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3528 " data_direction: %d\n", cmd, cmd->data_direction);
3529 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3530 transport_handle_queue_full(cmd, cmd->se_dev);
3531 }
3532
3533 static void transport_free_dev_tasks(struct se_cmd *cmd)
3534 {
3535 struct se_task *task, *task_tmp;
3536 unsigned long flags;
3537 LIST_HEAD(dispose_list);
3538
3539 spin_lock_irqsave(&cmd->t_state_lock, flags);
3540 list_for_each_entry_safe(task, task_tmp,
3541 &cmd->t_task_list, t_list) {
3542 if (!(task->task_flags & TF_ACTIVE))
3543 list_move_tail(&task->t_list, &dispose_list);
3544 }
3545 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3546
3547 while (!list_empty(&dispose_list)) {
3548 task = list_first_entry(&dispose_list, struct se_task, t_list);
3549
3550 /*
3551 * We already cancelled all pending timers in
3552 * transport_complete_task, but that was just a pure del_timer,
3553 * so do a full del_timer_sync here to make sure any handler
3554 * that was running at that point has finished execution.
3555 */
3556 del_timer_sync(&task->task_timer);
3557
3558 kfree(task->task_sg);
3559
3560 list_del(&task->t_list);
3561
3562 cmd->se_dev->transport->free_task(task);
3563 }
3564 }
3565
3566 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3567 {
3568 struct scatterlist *sg;
3569 int count;
3570
3571 for_each_sg(sgl, sg, nents, count)
3572 __free_page(sg_page(sg));
3573
3574 kfree(sgl);
3575 }
3576
3577 static inline void transport_free_pages(struct se_cmd *cmd)
3578 {
3579 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3580 return;
3581
3582 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3583 cmd->t_data_sg = NULL;
3584 cmd->t_data_nents = 0;
3585
3586 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3587 cmd->t_bidi_data_sg = NULL;
3588 cmd->t_bidi_data_nents = 0;
3589 }
3590
3591 /**
3592 * transport_put_cmd - release a reference to a command
3593 * @cmd: command to release
3594 *
3595 * This routine releases our reference to the command and frees it if possible.
3596 */
3597 static void transport_put_cmd(struct se_cmd *cmd)
3598 {
3599 unsigned long flags;
3600 int free_tasks = 0;
3601
3602 spin_lock_irqsave(&cmd->t_state_lock, flags);
3603 if (atomic_read(&cmd->t_fe_count)) {
3604 if (!atomic_dec_and_test(&cmd->t_fe_count))
3605 goto out_busy;
3606 }
3607
3608 if (atomic_read(&cmd->t_se_count)) {
3609 if (!atomic_dec_and_test(&cmd->t_se_count))
3610 goto out_busy;
3611 }
3612
3613 if (atomic_read(&cmd->transport_dev_active)) {
3614 atomic_set(&cmd->transport_dev_active, 0);
3615 transport_all_task_dev_remove_state(cmd);
3616 free_tasks = 1;
3617 }
3618 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3619
3620 if (free_tasks != 0)
3621 transport_free_dev_tasks(cmd);
3622
3623 transport_free_pages(cmd);
3624 transport_release_cmd(cmd);
3625 return;
3626 out_busy:
3627 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3628 }
3629
3630 /*
3631 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3632 * allocating in the core.
3633 * @cmd: Associated se_cmd descriptor
3634 * @mem: SGL style memory for TCM WRITE / READ
3635 * @sg_mem_num: Number of SGL elements
3636 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3637 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3638 *
3639 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3640 * of parameters.
3641 */
3642 int transport_generic_map_mem_to_cmd(
3643 struct se_cmd *cmd,
3644 struct scatterlist *sgl,
3645 u32 sgl_count,
3646 struct scatterlist *sgl_bidi,
3647 u32 sgl_bidi_count)
3648 {
3649 if (!sgl || !sgl_count)
3650 return 0;
3651
3652 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3653 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3654
3655 cmd->t_data_sg = sgl;
3656 cmd->t_data_nents = sgl_count;
3657
3658 if (sgl_bidi && sgl_bidi_count) {
3659 cmd->t_bidi_data_sg = sgl_bidi;
3660 cmd->t_bidi_data_nents = sgl_bidi_count;
3661 }
3662 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3663 }
3664
3665 return 0;
3666 }
3667 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3668
3669 static int transport_new_cmd_obj(struct se_cmd *cmd)
3670 {
3671 struct se_device *dev = cmd->se_dev;
3672 int set_counts = 1, rc, task_cdbs;
3673
3674 /*
3675 * Setup any BIDI READ tasks and memory from
3676 * cmd->t_mem_bidi_list so the READ struct se_tasks
3677 * are queued first for the non pSCSI passthrough case.
3678 */
3679 if (cmd->t_bidi_data_sg &&
3680 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3681 rc = transport_allocate_tasks(cmd,
3682 cmd->t_task_lba,
3683 DMA_FROM_DEVICE,
3684 cmd->t_bidi_data_sg,
3685 cmd->t_bidi_data_nents);
3686 if (rc <= 0) {
3687 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3688 cmd->scsi_sense_reason =
3689 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3690 return -EINVAL;
3691 }
3692 atomic_inc(&cmd->t_fe_count);
3693 atomic_inc(&cmd->t_se_count);
3694 set_counts = 0;
3695 }
3696 /*
3697 * Setup the tasks and memory from cmd->t_mem_list
3698 * Note for BIDI transfers this will contain the WRITE payload
3699 */
3700 task_cdbs = transport_allocate_tasks(cmd,
3701 cmd->t_task_lba,
3702 cmd->data_direction,
3703 cmd->t_data_sg,
3704 cmd->t_data_nents);
3705 if (task_cdbs <= 0) {
3706 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3707 cmd->scsi_sense_reason =
3708 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3709 return -EINVAL;
3710 }
3711
3712 if (set_counts) {
3713 atomic_inc(&cmd->t_fe_count);
3714 atomic_inc(&cmd->t_se_count);
3715 }
3716
3717 cmd->t_task_list_num = task_cdbs;
3718
3719 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3720 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3721 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
3722 return 0;
3723 }
3724
3725 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3726 {
3727 struct scatterlist *sg = cmd->t_data_sg;
3728
3729 BUG_ON(!sg);
3730 /*
3731 * We need to take into account a possible offset here for fabrics like
3732 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3733 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3734 */
3735 return kmap(sg_page(sg)) + sg->offset;
3736 }
3737 EXPORT_SYMBOL(transport_kmap_first_data_page);
3738
3739 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3740 {
3741 kunmap(sg_page(cmd->t_data_sg));
3742 }
3743 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3744
3745 static int
3746 transport_generic_get_mem(struct se_cmd *cmd)
3747 {
3748 u32 length = cmd->data_length;
3749 unsigned int nents;
3750 struct page *page;
3751 int i = 0;
3752
3753 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3754 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3755 if (!cmd->t_data_sg)
3756 return -ENOMEM;
3757
3758 cmd->t_data_nents = nents;
3759 sg_init_table(cmd->t_data_sg, nents);
3760
3761 while (length) {
3762 u32 page_len = min_t(u32, length, PAGE_SIZE);
3763 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3764 if (!page)
3765 goto out;
3766
3767 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3768 length -= page_len;
3769 i++;
3770 }
3771 return 0;
3772
3773 out:
3774 while (i >= 0) {
3775 __free_page(sg_page(&cmd->t_data_sg[i]));
3776 i--;
3777 }
3778 kfree(cmd->t_data_sg);
3779 cmd->t_data_sg = NULL;
3780 return -ENOMEM;
3781 }
3782
3783 /* Reduce sectors if they are too long for the device */
3784 static inline sector_t transport_limit_task_sectors(
3785 struct se_device *dev,
3786 unsigned long long lba,
3787 sector_t sectors)
3788 {
3789 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3790
3791 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3792 if ((lba + sectors) > transport_dev_end_lba(dev))
3793 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3794
3795 return sectors;
3796 }
3797
3798
3799 /*
3800 * This function can be used by HW target mode drivers to create a linked
3801 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3802 * This is intended to be called during the completion path by TCM Core
3803 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3804 */
3805 void transport_do_task_sg_chain(struct se_cmd *cmd)
3806 {
3807 struct scatterlist *sg_first = NULL;
3808 struct scatterlist *sg_prev = NULL;
3809 int sg_prev_nents = 0;
3810 struct scatterlist *sg;
3811 struct se_task *task;
3812 u32 chained_nents = 0;
3813 int i;
3814
3815 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3816
3817 /*
3818 * Walk the struct se_task list and setup scatterlist chains
3819 * for each contiguously allocated struct se_task->task_sg[].
3820 */
3821 list_for_each_entry(task, &cmd->t_task_list, t_list) {
3822 if (!task->task_sg)
3823 continue;
3824
3825 if (!sg_first) {
3826 sg_first = task->task_sg;
3827 chained_nents = task->task_sg_nents;
3828 } else {
3829 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3830 chained_nents += task->task_sg_nents;
3831 }
3832 /*
3833 * For the padded tasks, use the extra SGL vector allocated
3834 * in transport_allocate_data_tasks() for the sg_prev_nents
3835 * offset into sg_chain() above.
3836 *
3837 * We do not need the padding for the last task (or a single
3838 * task), but in that case we will never use the sg_prev_nents
3839 * value below which would be incorrect.
3840 */
3841 sg_prev_nents = (task->task_sg_nents + 1);
3842 sg_prev = task->task_sg;
3843 }
3844 /*
3845 * Setup the starting pointer and total t_tasks_sg_linked_no including
3846 * padding SGs for linking and to mark the end.
3847 */
3848 cmd->t_tasks_sg_chained = sg_first;
3849 cmd->t_tasks_sg_chained_no = chained_nents;
3850
3851 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3852 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3853 cmd->t_tasks_sg_chained_no);
3854
3855 for_each_sg(cmd->t_tasks_sg_chained, sg,
3856 cmd->t_tasks_sg_chained_no, i) {
3857
3858 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3859 i, sg, sg_page(sg), sg->length, sg->offset);
3860 if (sg_is_chain(sg))
3861 pr_debug("SG: %p sg_is_chain=1\n", sg);
3862 if (sg_is_last(sg))
3863 pr_debug("SG: %p sg_is_last=1\n", sg);
3864 }
3865 }
3866 EXPORT_SYMBOL(transport_do_task_sg_chain);
3867
3868 /*
3869 * Break up cmd into chunks transport can handle
3870 */
3871 static int transport_allocate_data_tasks(
3872 struct se_cmd *cmd,
3873 unsigned long long lba,
3874 enum dma_data_direction data_direction,
3875 struct scatterlist *sgl,
3876 unsigned int sgl_nents)
3877 {
3878 struct se_task *task;
3879 struct se_device *dev = cmd->se_dev;
3880 unsigned long flags;
3881 int task_count, i;
3882 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3883 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3884 struct scatterlist *sg;
3885 struct scatterlist *cmd_sg;
3886
3887 WARN_ON(cmd->data_length % sector_size);
3888 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3889 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3890
3891 cmd_sg = sgl;
3892 for (i = 0; i < task_count; i++) {
3893 unsigned int task_size, task_sg_nents_padded;
3894 int count;
3895
3896 task = transport_generic_get_task(cmd, data_direction);
3897 if (!task)
3898 return -ENOMEM;
3899
3900 task->task_lba = lba;
3901 task->task_sectors = min(sectors, dev_max_sectors);
3902 task->task_size = task->task_sectors * sector_size;
3903
3904 /*
3905 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3906 * in order to calculate the number per task SGL entries
3907 */
3908 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3909 /*
3910 * Check if the fabric module driver is requesting that all
3911 * struct se_task->task_sg[] be chained together.. If so,
3912 * then allocate an extra padding SG entry for linking and
3913 * marking the end of the chained SGL for every task except
3914 * the last one for (task_count > 1) operation, or skipping
3915 * the extra padding for the (task_count == 1) case.
3916 */
3917 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3918 task_sg_nents_padded = (task->task_sg_nents + 1);
3919 } else
3920 task_sg_nents_padded = task->task_sg_nents;
3921
3922 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3923 task_sg_nents_padded, GFP_KERNEL);
3924 if (!task->task_sg) {
3925 cmd->se_dev->transport->free_task(task);
3926 return -ENOMEM;
3927 }
3928
3929 sg_init_table(task->task_sg, task_sg_nents_padded);
3930
3931 task_size = task->task_size;
3932
3933 /* Build new sgl, only up to task_size */
3934 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3935 if (cmd_sg->length > task_size)
3936 break;
3937
3938 *sg = *cmd_sg;
3939 task_size -= cmd_sg->length;
3940 cmd_sg = sg_next(cmd_sg);
3941 }
3942
3943 lba += task->task_sectors;
3944 sectors -= task->task_sectors;
3945
3946 spin_lock_irqsave(&cmd->t_state_lock, flags);
3947 list_add_tail(&task->t_list, &cmd->t_task_list);
3948 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3949 }
3950
3951 return task_count;
3952 }
3953
3954 static int
3955 transport_allocate_control_task(struct se_cmd *cmd)
3956 {
3957 struct se_task *task;
3958 unsigned long flags;
3959
3960 task = transport_generic_get_task(cmd, cmd->data_direction);
3961 if (!task)
3962 return -ENOMEM;
3963
3964 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
3965 GFP_KERNEL);
3966 if (!task->task_sg) {
3967 cmd->se_dev->transport->free_task(task);
3968 return -ENOMEM;
3969 }
3970
3971 memcpy(task->task_sg, cmd->t_data_sg,
3972 sizeof(struct scatterlist) * cmd->t_data_nents);
3973 task->task_size = cmd->data_length;
3974 task->task_sg_nents = cmd->t_data_nents;
3975
3976 spin_lock_irqsave(&cmd->t_state_lock, flags);
3977 list_add_tail(&task->t_list, &cmd->t_task_list);
3978 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3979
3980 /* Success! Return number of tasks allocated */
3981 return 1;
3982 }
3983
3984 static u32 transport_allocate_tasks(
3985 struct se_cmd *cmd,
3986 unsigned long long lba,
3987 enum dma_data_direction data_direction,
3988 struct scatterlist *sgl,
3989 unsigned int sgl_nents)
3990 {
3991 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3992 if (transport_cmd_get_valid_sectors(cmd) < 0)
3993 return -EINVAL;
3994
3995 return transport_allocate_data_tasks(cmd, lba, data_direction,
3996 sgl, sgl_nents);
3997 } else
3998 return transport_allocate_control_task(cmd);
3999
4000 }
4001
4002
4003 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4004 *
4005 * Allocate storage transport resources from a set of values predefined
4006 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4007 * Any non zero return here is treated as an "out of resource' op here.
4008 */
4009 /*
4010 * Generate struct se_task(s) and/or their payloads for this CDB.
4011 */
4012 int transport_generic_new_cmd(struct se_cmd *cmd)
4013 {
4014 int ret = 0;
4015
4016 /*
4017 * Determine is the TCM fabric module has already allocated physical
4018 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4019 * beforehand.
4020 */
4021 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4022 cmd->data_length) {
4023 ret = transport_generic_get_mem(cmd);
4024 if (ret < 0)
4025 return ret;
4026 }
4027 /*
4028 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4029 * control or data CDB types, and perform the map to backend subsystem
4030 * code from SGL memory allocated here by transport_generic_get_mem(), or
4031 * via pre-existing SGL memory setup explictly by fabric module code with
4032 * transport_generic_map_mem_to_cmd().
4033 */
4034 ret = transport_new_cmd_obj(cmd);
4035 if (ret < 0)
4036 return ret;
4037 /*
4038 * For WRITEs, let the fabric know its buffer is ready..
4039 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4040 * will be added to the struct se_device execution queue after its WRITE
4041 * data has arrived. (ie: It gets handled by the transport processing
4042 * thread a second time)
4043 */
4044 if (cmd->data_direction == DMA_TO_DEVICE) {
4045 transport_add_tasks_to_state_queue(cmd);
4046 return transport_generic_write_pending(cmd);
4047 }
4048 /*
4049 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4050 * to the execution queue.
4051 */
4052 transport_execute_tasks(cmd);
4053 return 0;
4054 }
4055 EXPORT_SYMBOL(transport_generic_new_cmd);
4056
4057 /* transport_generic_process_write():
4058 *
4059 *
4060 */
4061 void transport_generic_process_write(struct se_cmd *cmd)
4062 {
4063 transport_execute_tasks(cmd);
4064 }
4065 EXPORT_SYMBOL(transport_generic_process_write);
4066
4067 static void transport_write_pending_qf(struct se_cmd *cmd)
4068 {
4069 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4070 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4071 cmd);
4072 transport_handle_queue_full(cmd, cmd->se_dev);
4073 }
4074 }
4075
4076 static int transport_generic_write_pending(struct se_cmd *cmd)
4077 {
4078 unsigned long flags;
4079 int ret;
4080
4081 spin_lock_irqsave(&cmd->t_state_lock, flags);
4082 cmd->t_state = TRANSPORT_WRITE_PENDING;
4083 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4084
4085 /*
4086 * Clear the se_cmd for WRITE_PENDING status in order to set
4087 * cmd->t_transport_active=0 so that transport_generic_handle_data
4088 * can be called from HW target mode interrupt code. This is safe
4089 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4090 * because the se_cmd->se_lun pointer is not being cleared.
4091 */
4092 transport_cmd_check_stop(cmd, 1, 0);
4093
4094 /*
4095 * Call the fabric write_pending function here to let the
4096 * frontend know that WRITE buffers are ready.
4097 */
4098 ret = cmd->se_tfo->write_pending(cmd);
4099 if (ret == -EAGAIN)
4100 goto queue_full;
4101 else if (ret < 0)
4102 return ret;
4103
4104 return PYX_TRANSPORT_WRITE_PENDING;
4105
4106 queue_full:
4107 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
4108 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4109 transport_handle_queue_full(cmd, cmd->se_dev);
4110 return ret;
4111 }
4112
4113 /**
4114 * transport_release_cmd - free a command
4115 * @cmd: command to free
4116 *
4117 * This routine unconditionally frees a command, and reference counting
4118 * or list removal must be done in the caller.
4119 */
4120 void transport_release_cmd(struct se_cmd *cmd)
4121 {
4122 BUG_ON(!cmd->se_tfo);
4123
4124 if (cmd->se_tmr_req)
4125 core_tmr_release_req(cmd->se_tmr_req);
4126 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4127 kfree(cmd->t_task_cdb);
4128 cmd->se_tfo->release_cmd(cmd);
4129 }
4130 EXPORT_SYMBOL(transport_release_cmd);
4131
4132 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
4133 {
4134 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4135 if (wait_for_tasks && cmd->se_tmr_req)
4136 transport_wait_for_tasks(cmd);
4137
4138 transport_release_cmd(cmd);
4139 } else {
4140 if (wait_for_tasks)
4141 transport_wait_for_tasks(cmd);
4142
4143 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4144
4145 if (cmd->se_lun)
4146 transport_lun_remove_cmd(cmd);
4147
4148 transport_free_dev_tasks(cmd);
4149
4150 transport_put_cmd(cmd);
4151 }
4152 }
4153 EXPORT_SYMBOL(transport_generic_free_cmd);
4154
4155 /* transport_lun_wait_for_tasks():
4156 *
4157 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4158 * an struct se_lun to be successfully shutdown.
4159 */
4160 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4161 {
4162 unsigned long flags;
4163 int ret;
4164 /*
4165 * If the frontend has already requested this struct se_cmd to
4166 * be stopped, we can safely ignore this struct se_cmd.
4167 */
4168 spin_lock_irqsave(&cmd->t_state_lock, flags);
4169 if (atomic_read(&cmd->t_transport_stop)) {
4170 atomic_set(&cmd->transport_lun_stop, 0);
4171 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4172 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4173 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4174 transport_cmd_check_stop(cmd, 1, 0);
4175 return -EPERM;
4176 }
4177 atomic_set(&cmd->transport_lun_fe_stop, 1);
4178 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4179
4180 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4181
4182 ret = transport_stop_tasks_for_cmd(cmd);
4183
4184 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4185 " %d\n", cmd, cmd->t_task_list_num, ret);
4186 if (!ret) {
4187 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4188 cmd->se_tfo->get_task_tag(cmd));
4189 wait_for_completion(&cmd->transport_lun_stop_comp);
4190 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4191 cmd->se_tfo->get_task_tag(cmd));
4192 }
4193 transport_remove_cmd_from_queue(cmd);
4194
4195 return 0;
4196 }
4197
4198 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4199 {
4200 struct se_cmd *cmd = NULL;
4201 unsigned long lun_flags, cmd_flags;
4202 /*
4203 * Do exception processing and return CHECK_CONDITION status to the
4204 * Initiator Port.
4205 */
4206 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4207 while (!list_empty(&lun->lun_cmd_list)) {
4208 cmd = list_first_entry(&lun->lun_cmd_list,
4209 struct se_cmd, se_lun_node);
4210 list_del(&cmd->se_lun_node);
4211
4212 atomic_set(&cmd->transport_lun_active, 0);
4213 /*
4214 * This will notify iscsi_target_transport.c:
4215 * transport_cmd_check_stop() that a LUN shutdown is in
4216 * progress for the iscsi_cmd_t.
4217 */
4218 spin_lock(&cmd->t_state_lock);
4219 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4220 "_lun_stop for ITT: 0x%08x\n",
4221 cmd->se_lun->unpacked_lun,
4222 cmd->se_tfo->get_task_tag(cmd));
4223 atomic_set(&cmd->transport_lun_stop, 1);
4224 spin_unlock(&cmd->t_state_lock);
4225
4226 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4227
4228 if (!cmd->se_lun) {
4229 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4230 cmd->se_tfo->get_task_tag(cmd),
4231 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4232 BUG();
4233 }
4234 /*
4235 * If the Storage engine still owns the iscsi_cmd_t, determine
4236 * and/or stop its context.
4237 */
4238 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4239 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4240 cmd->se_tfo->get_task_tag(cmd));
4241
4242 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4243 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4244 continue;
4245 }
4246
4247 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4248 "_wait_for_tasks(): SUCCESS\n",
4249 cmd->se_lun->unpacked_lun,
4250 cmd->se_tfo->get_task_tag(cmd));
4251
4252 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4253 if (!atomic_read(&cmd->transport_dev_active)) {
4254 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4255 goto check_cond;
4256 }
4257 atomic_set(&cmd->transport_dev_active, 0);
4258 transport_all_task_dev_remove_state(cmd);
4259 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4260
4261 transport_free_dev_tasks(cmd);
4262 /*
4263 * The Storage engine stopped this struct se_cmd before it was
4264 * send to the fabric frontend for delivery back to the
4265 * Initiator Node. Return this SCSI CDB back with an
4266 * CHECK_CONDITION status.
4267 */
4268 check_cond:
4269 transport_send_check_condition_and_sense(cmd,
4270 TCM_NON_EXISTENT_LUN, 0);
4271 /*
4272 * If the fabric frontend is waiting for this iscsi_cmd_t to
4273 * be released, notify the waiting thread now that LU has
4274 * finished accessing it.
4275 */
4276 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4277 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4278 pr_debug("SE_LUN[%d] - Detected FE stop for"
4279 " struct se_cmd: %p ITT: 0x%08x\n",
4280 lun->unpacked_lun,
4281 cmd, cmd->se_tfo->get_task_tag(cmd));
4282
4283 spin_unlock_irqrestore(&cmd->t_state_lock,
4284 cmd_flags);
4285 transport_cmd_check_stop(cmd, 1, 0);
4286 complete(&cmd->transport_lun_fe_stop_comp);
4287 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4288 continue;
4289 }
4290 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4291 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4292
4293 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4294 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4295 }
4296 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4297 }
4298
4299 static int transport_clear_lun_thread(void *p)
4300 {
4301 struct se_lun *lun = (struct se_lun *)p;
4302
4303 __transport_clear_lun_from_sessions(lun);
4304 complete(&lun->lun_shutdown_comp);
4305
4306 return 0;
4307 }
4308
4309 int transport_clear_lun_from_sessions(struct se_lun *lun)
4310 {
4311 struct task_struct *kt;
4312
4313 kt = kthread_run(transport_clear_lun_thread, lun,
4314 "tcm_cl_%u", lun->unpacked_lun);
4315 if (IS_ERR(kt)) {
4316 pr_err("Unable to start clear_lun thread\n");
4317 return PTR_ERR(kt);
4318 }
4319 wait_for_completion(&lun->lun_shutdown_comp);
4320
4321 return 0;
4322 }
4323
4324 /**
4325 * transport_wait_for_tasks - wait for completion to occur
4326 * @cmd: command to wait
4327 *
4328 * Called from frontend fabric context to wait for storage engine
4329 * to pause and/or release frontend generated struct se_cmd.
4330 */
4331 void transport_wait_for_tasks(struct se_cmd *cmd)
4332 {
4333 unsigned long flags;
4334
4335 spin_lock_irqsave(&cmd->t_state_lock, flags);
4336 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4337 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4338 return;
4339 }
4340 /*
4341 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4342 * has been set in transport_set_supported_SAM_opcode().
4343 */
4344 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4345 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4346 return;
4347 }
4348 /*
4349 * If we are already stopped due to an external event (ie: LUN shutdown)
4350 * sleep until the connection can have the passed struct se_cmd back.
4351 * The cmd->transport_lun_stopped_sem will be upped by
4352 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4353 * has completed its operation on the struct se_cmd.
4354 */
4355 if (atomic_read(&cmd->transport_lun_stop)) {
4356
4357 pr_debug("wait_for_tasks: Stopping"
4358 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4359 "_stop_comp); for ITT: 0x%08x\n",
4360 cmd->se_tfo->get_task_tag(cmd));
4361 /*
4362 * There is a special case for WRITES where a FE exception +
4363 * LUN shutdown means ConfigFS context is still sleeping on
4364 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4365 * We go ahead and up transport_lun_stop_comp just to be sure
4366 * here.
4367 */
4368 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4369 complete(&cmd->transport_lun_stop_comp);
4370 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4371 spin_lock_irqsave(&cmd->t_state_lock, flags);
4372
4373 transport_all_task_dev_remove_state(cmd);
4374 /*
4375 * At this point, the frontend who was the originator of this
4376 * struct se_cmd, now owns the structure and can be released through
4377 * normal means below.
4378 */
4379 pr_debug("wait_for_tasks: Stopped"
4380 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4381 "stop_comp); for ITT: 0x%08x\n",
4382 cmd->se_tfo->get_task_tag(cmd));
4383
4384 atomic_set(&cmd->transport_lun_stop, 0);
4385 }
4386 if (!atomic_read(&cmd->t_transport_active) ||
4387 atomic_read(&cmd->t_transport_aborted)) {
4388 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4389 return;
4390 }
4391
4392 atomic_set(&cmd->t_transport_stop, 1);
4393
4394 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4395 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4396 cmd, cmd->se_tfo->get_task_tag(cmd),
4397 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4398
4399 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4400
4401 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4402
4403 wait_for_completion(&cmd->t_transport_stop_comp);
4404
4405 spin_lock_irqsave(&cmd->t_state_lock, flags);
4406 atomic_set(&cmd->t_transport_active, 0);
4407 atomic_set(&cmd->t_transport_stop, 0);
4408
4409 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4410 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4411 cmd->se_tfo->get_task_tag(cmd));
4412
4413 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4414 }
4415 EXPORT_SYMBOL(transport_wait_for_tasks);
4416
4417 static int transport_get_sense_codes(
4418 struct se_cmd *cmd,
4419 u8 *asc,
4420 u8 *ascq)
4421 {
4422 *asc = cmd->scsi_asc;
4423 *ascq = cmd->scsi_ascq;
4424
4425 return 0;
4426 }
4427
4428 static int transport_set_sense_codes(
4429 struct se_cmd *cmd,
4430 u8 asc,
4431 u8 ascq)
4432 {
4433 cmd->scsi_asc = asc;
4434 cmd->scsi_ascq = ascq;
4435
4436 return 0;
4437 }
4438
4439 int transport_send_check_condition_and_sense(
4440 struct se_cmd *cmd,
4441 u8 reason,
4442 int from_transport)
4443 {
4444 unsigned char *buffer = cmd->sense_buffer;
4445 unsigned long flags;
4446 int offset;
4447 u8 asc = 0, ascq = 0;
4448
4449 spin_lock_irqsave(&cmd->t_state_lock, flags);
4450 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4451 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4452 return 0;
4453 }
4454 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4455 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4456
4457 if (!reason && from_transport)
4458 goto after_reason;
4459
4460 if (!from_transport)
4461 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4462 /*
4463 * Data Segment and SenseLength of the fabric response PDU.
4464 *
4465 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4466 * from include/scsi/scsi_cmnd.h
4467 */
4468 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4469 TRANSPORT_SENSE_BUFFER);
4470 /*
4471 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4472 * SENSE KEY values from include/scsi/scsi.h
4473 */
4474 switch (reason) {
4475 case TCM_NON_EXISTENT_LUN:
4476 /* CURRENT ERROR */
4477 buffer[offset] = 0x70;
4478 /* ILLEGAL REQUEST */
4479 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4480 /* LOGICAL UNIT NOT SUPPORTED */
4481 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4482 break;
4483 case TCM_UNSUPPORTED_SCSI_OPCODE:
4484 case TCM_SECTOR_COUNT_TOO_MANY:
4485 /* CURRENT ERROR */
4486 buffer[offset] = 0x70;
4487 /* ILLEGAL REQUEST */
4488 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4489 /* INVALID COMMAND OPERATION CODE */
4490 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4491 break;
4492 case TCM_UNKNOWN_MODE_PAGE:
4493 /* CURRENT ERROR */
4494 buffer[offset] = 0x70;
4495 /* ILLEGAL REQUEST */
4496 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4497 /* INVALID FIELD IN CDB */
4498 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4499 break;
4500 case TCM_CHECK_CONDITION_ABORT_CMD:
4501 /* CURRENT ERROR */
4502 buffer[offset] = 0x70;
4503 /* ABORTED COMMAND */
4504 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4505 /* BUS DEVICE RESET FUNCTION OCCURRED */
4506 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4507 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4508 break;
4509 case TCM_INCORRECT_AMOUNT_OF_DATA:
4510 /* CURRENT ERROR */
4511 buffer[offset] = 0x70;
4512 /* ABORTED COMMAND */
4513 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4514 /* WRITE ERROR */
4515 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4516 /* NOT ENOUGH UNSOLICITED DATA */
4517 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4518 break;
4519 case TCM_INVALID_CDB_FIELD:
4520 /* CURRENT ERROR */
4521 buffer[offset] = 0x70;
4522 /* ABORTED COMMAND */
4523 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4524 /* INVALID FIELD IN CDB */
4525 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4526 break;
4527 case TCM_INVALID_PARAMETER_LIST:
4528 /* CURRENT ERROR */
4529 buffer[offset] = 0x70;
4530 /* ABORTED COMMAND */
4531 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4532 /* INVALID FIELD IN PARAMETER LIST */
4533 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4534 break;
4535 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4536 /* CURRENT ERROR */
4537 buffer[offset] = 0x70;
4538 /* ABORTED COMMAND */
4539 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4540 /* WRITE ERROR */
4541 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4542 /* UNEXPECTED_UNSOLICITED_DATA */
4543 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4544 break;
4545 case TCM_SERVICE_CRC_ERROR:
4546 /* CURRENT ERROR */
4547 buffer[offset] = 0x70;
4548 /* ABORTED COMMAND */
4549 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4550 /* PROTOCOL SERVICE CRC ERROR */
4551 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4552 /* N/A */
4553 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4554 break;
4555 case TCM_SNACK_REJECTED:
4556 /* CURRENT ERROR */
4557 buffer[offset] = 0x70;
4558 /* ABORTED COMMAND */
4559 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4560 /* READ ERROR */
4561 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4562 /* FAILED RETRANSMISSION REQUEST */
4563 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4564 break;
4565 case TCM_WRITE_PROTECTED:
4566 /* CURRENT ERROR */
4567 buffer[offset] = 0x70;
4568 /* DATA PROTECT */
4569 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4570 /* WRITE PROTECTED */
4571 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4572 break;
4573 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4574 /* CURRENT ERROR */
4575 buffer[offset] = 0x70;
4576 /* UNIT ATTENTION */
4577 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4578 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4579 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4580 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4581 break;
4582 case TCM_CHECK_CONDITION_NOT_READY:
4583 /* CURRENT ERROR */
4584 buffer[offset] = 0x70;
4585 /* Not Ready */
4586 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4587 transport_get_sense_codes(cmd, &asc, &ascq);
4588 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4589 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4590 break;
4591 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4592 default:
4593 /* CURRENT ERROR */
4594 buffer[offset] = 0x70;
4595 /* ILLEGAL REQUEST */
4596 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4597 /* LOGICAL UNIT COMMUNICATION FAILURE */
4598 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4599 break;
4600 }
4601 /*
4602 * This code uses linux/include/scsi/scsi.h SAM status codes!
4603 */
4604 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4605 /*
4606 * Automatically padded, this value is encoded in the fabric's
4607 * data_length response PDU containing the SCSI defined sense data.
4608 */
4609 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4610
4611 after_reason:
4612 return cmd->se_tfo->queue_status(cmd);
4613 }
4614 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4615
4616 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4617 {
4618 int ret = 0;
4619
4620 if (atomic_read(&cmd->t_transport_aborted) != 0) {
4621 if (!send_status ||
4622 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4623 return 1;
4624 #if 0
4625 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4626 " status for CDB: 0x%02x ITT: 0x%08x\n",
4627 cmd->t_task_cdb[0],
4628 cmd->se_tfo->get_task_tag(cmd));
4629 #endif
4630 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4631 cmd->se_tfo->queue_status(cmd);
4632 ret = 1;
4633 }
4634 return ret;
4635 }
4636 EXPORT_SYMBOL(transport_check_aborted_status);
4637
4638 void transport_send_task_abort(struct se_cmd *cmd)
4639 {
4640 unsigned long flags;
4641
4642 spin_lock_irqsave(&cmd->t_state_lock, flags);
4643 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4644 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4645 return;
4646 }
4647 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4648
4649 /*
4650 * If there are still expected incoming fabric WRITEs, we wait
4651 * until until they have completed before sending a TASK_ABORTED
4652 * response. This response with TASK_ABORTED status will be
4653 * queued back to fabric module by transport_check_aborted_status().
4654 */
4655 if (cmd->data_direction == DMA_TO_DEVICE) {
4656 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4657 atomic_inc(&cmd->t_transport_aborted);
4658 smp_mb__after_atomic_inc();
4659 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4660 transport_new_cmd_failure(cmd);
4661 return;
4662 }
4663 }
4664 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4665 #if 0
4666 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4667 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4668 cmd->se_tfo->get_task_tag(cmd));
4669 #endif
4670 cmd->se_tfo->queue_status(cmd);
4671 }
4672
4673 /* transport_generic_do_tmr():
4674 *
4675 *
4676 */
4677 int transport_generic_do_tmr(struct se_cmd *cmd)
4678 {
4679 struct se_device *dev = cmd->se_dev;
4680 struct se_tmr_req *tmr = cmd->se_tmr_req;
4681 int ret;
4682
4683 switch (tmr->function) {
4684 case TMR_ABORT_TASK:
4685 tmr->response = TMR_FUNCTION_REJECTED;
4686 break;
4687 case TMR_ABORT_TASK_SET:
4688 case TMR_CLEAR_ACA:
4689 case TMR_CLEAR_TASK_SET:
4690 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4691 break;
4692 case TMR_LUN_RESET:
4693 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4694 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4695 TMR_FUNCTION_REJECTED;
4696 break;
4697 case TMR_TARGET_WARM_RESET:
4698 tmr->response = TMR_FUNCTION_REJECTED;
4699 break;
4700 case TMR_TARGET_COLD_RESET:
4701 tmr->response = TMR_FUNCTION_REJECTED;
4702 break;
4703 default:
4704 pr_err("Uknown TMR function: 0x%02x.\n",
4705 tmr->function);
4706 tmr->response = TMR_FUNCTION_REJECTED;
4707 break;
4708 }
4709
4710 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4711 cmd->se_tfo->queue_tm_rsp(cmd);
4712
4713 transport_cmd_check_stop_to_fabric(cmd);
4714 return 0;
4715 }
4716
4717 /* transport_processing_thread():
4718 *
4719 *
4720 */
4721 static int transport_processing_thread(void *param)
4722 {
4723 int ret;
4724 struct se_cmd *cmd;
4725 struct se_device *dev = (struct se_device *) param;
4726
4727 set_user_nice(current, -20);
4728
4729 while (!kthread_should_stop()) {
4730 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4731 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4732 kthread_should_stop());
4733 if (ret < 0)
4734 goto out;
4735
4736 get_cmd:
4737 __transport_execute_tasks(dev);
4738
4739 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4740 if (!cmd)
4741 continue;
4742
4743 switch (cmd->t_state) {
4744 case TRANSPORT_NEW_CMD:
4745 BUG();
4746 break;
4747 case TRANSPORT_NEW_CMD_MAP:
4748 if (!cmd->se_tfo->new_cmd_map) {
4749 pr_err("cmd->se_tfo->new_cmd_map is"
4750 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4751 BUG();
4752 }
4753 ret = cmd->se_tfo->new_cmd_map(cmd);
4754 if (ret < 0) {
4755 cmd->transport_error_status = ret;
4756 transport_generic_request_failure(cmd,
4757 0, (cmd->data_direction !=
4758 DMA_TO_DEVICE));
4759 break;
4760 }
4761 ret = transport_generic_new_cmd(cmd);
4762 if (ret == -EAGAIN)
4763 break;
4764 else if (ret < 0) {
4765 cmd->transport_error_status = ret;
4766 transport_generic_request_failure(cmd,
4767 0, (cmd->data_direction !=
4768 DMA_TO_DEVICE));
4769 }
4770 break;
4771 case TRANSPORT_PROCESS_WRITE:
4772 transport_generic_process_write(cmd);
4773 break;
4774 case TRANSPORT_FREE_CMD_INTR:
4775 transport_generic_free_cmd(cmd, 0);
4776 break;
4777 case TRANSPORT_PROCESS_TMR:
4778 transport_generic_do_tmr(cmd);
4779 break;
4780 case TRANSPORT_COMPLETE_QF_WP:
4781 transport_write_pending_qf(cmd);
4782 break;
4783 case TRANSPORT_COMPLETE_QF_OK:
4784 transport_complete_qf(cmd);
4785 break;
4786 default:
4787 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4788 "i_state: %d on SE LUN: %u\n",
4789 cmd->t_state,
4790 cmd->se_tfo->get_task_tag(cmd),
4791 cmd->se_tfo->get_cmd_state(cmd),
4792 cmd->se_lun->unpacked_lun);
4793 BUG();
4794 }
4795
4796 goto get_cmd;
4797 }
4798
4799 out:
4800 WARN_ON(!list_empty(&dev->state_task_list));
4801 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4802 dev->process_thread = NULL;
4803 return 0;
4804 }
Linux kernel - Deliverables
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