target: remove transport_generic_handle_cdb
[linux-2.6.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_scdb.h"
58 #include "target_core_ua.h"
59
60 static int sub_api_initialized;
61
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 /* Used for transport_dev_get_map_*() */
73 typedef int (*map_func_t)(struct se_task *, u32);
74
75 static int transport_generic_write_pending(struct se_cmd *);
76 static int transport_processing_thread(void *param);
77 static int __transport_execute_tasks(struct se_device *dev);
78 static void transport_complete_task_attr(struct se_cmd *cmd);
79 static int transport_complete_qf(struct se_cmd *cmd);
80 static void transport_handle_queue_full(struct se_cmd *cmd,
81                 struct se_device *dev, int (*qf_callback)(struct se_cmd *));
82 static void transport_direct_request_timeout(struct se_cmd *cmd);
83 static void transport_free_dev_tasks(struct se_cmd *cmd);
84 static u32 transport_allocate_tasks(struct se_cmd *cmd,
85                 unsigned long long starting_lba,
86                 enum dma_data_direction data_direction,
87                 struct scatterlist *sgl, unsigned int nents);
88 static int transport_generic_get_mem(struct se_cmd *cmd);
89 static int transport_generic_remove(struct se_cmd *cmd,
90                 int session_reinstatement);
91 static void transport_release_fe_cmd(struct se_cmd *cmd);
92 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
93                 struct se_queue_obj *qobj);
94 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
95 static void transport_stop_all_task_timers(struct se_cmd *cmd);
96
97 int init_se_kmem_caches(void)
98 {
99         se_cmd_cache = kmem_cache_create("se_cmd_cache",
100                         sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
101         if (!se_cmd_cache) {
102                 pr_err("kmem_cache_create for struct se_cmd failed\n");
103                 goto out;
104         }
105         se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
106                         sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
107                         0, NULL);
108         if (!se_tmr_req_cache) {
109                 pr_err("kmem_cache_create() for struct se_tmr_req"
110                                 " failed\n");
111                 goto out;
112         }
113         se_sess_cache = kmem_cache_create("se_sess_cache",
114                         sizeof(struct se_session), __alignof__(struct se_session),
115                         0, NULL);
116         if (!se_sess_cache) {
117                 pr_err("kmem_cache_create() for struct se_session"
118                                 " failed\n");
119                 goto out;
120         }
121         se_ua_cache = kmem_cache_create("se_ua_cache",
122                         sizeof(struct se_ua), __alignof__(struct se_ua),
123                         0, NULL);
124         if (!se_ua_cache) {
125                 pr_err("kmem_cache_create() for struct se_ua failed\n");
126                 goto out;
127         }
128         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
129                         sizeof(struct t10_pr_registration),
130                         __alignof__(struct t10_pr_registration), 0, NULL);
131         if (!t10_pr_reg_cache) {
132                 pr_err("kmem_cache_create() for struct t10_pr_registration"
133                                 " failed\n");
134                 goto out;
135         }
136         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
137                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
138                         0, NULL);
139         if (!t10_alua_lu_gp_cache) {
140                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
141                                 " failed\n");
142                 goto out;
143         }
144         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
145                         sizeof(struct t10_alua_lu_gp_member),
146                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
147         if (!t10_alua_lu_gp_mem_cache) {
148                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
149                                 "cache failed\n");
150                 goto out;
151         }
152         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
153                         sizeof(struct t10_alua_tg_pt_gp),
154                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
155         if (!t10_alua_tg_pt_gp_cache) {
156                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
157                                 "cache failed\n");
158                 goto out;
159         }
160         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
161                         "t10_alua_tg_pt_gp_mem_cache",
162                         sizeof(struct t10_alua_tg_pt_gp_member),
163                         __alignof__(struct t10_alua_tg_pt_gp_member),
164                         0, NULL);
165         if (!t10_alua_tg_pt_gp_mem_cache) {
166                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
167                                 "mem_t failed\n");
168                 goto out;
169         }
170
171         return 0;
172 out:
173         if (se_cmd_cache)
174                 kmem_cache_destroy(se_cmd_cache);
175         if (se_tmr_req_cache)
176                 kmem_cache_destroy(se_tmr_req_cache);
177         if (se_sess_cache)
178                 kmem_cache_destroy(se_sess_cache);
179         if (se_ua_cache)
180                 kmem_cache_destroy(se_ua_cache);
181         if (t10_pr_reg_cache)
182                 kmem_cache_destroy(t10_pr_reg_cache);
183         if (t10_alua_lu_gp_cache)
184                 kmem_cache_destroy(t10_alua_lu_gp_cache);
185         if (t10_alua_lu_gp_mem_cache)
186                 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
187         if (t10_alua_tg_pt_gp_cache)
188                 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
189         if (t10_alua_tg_pt_gp_mem_cache)
190                 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
191         return -ENOMEM;
192 }
193
194 void release_se_kmem_caches(void)
195 {
196         kmem_cache_destroy(se_cmd_cache);
197         kmem_cache_destroy(se_tmr_req_cache);
198         kmem_cache_destroy(se_sess_cache);
199         kmem_cache_destroy(se_ua_cache);
200         kmem_cache_destroy(t10_pr_reg_cache);
201         kmem_cache_destroy(t10_alua_lu_gp_cache);
202         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
203         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
204         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
205 }
206
207 /* This code ensures unique mib indexes are handed out. */
208 static DEFINE_SPINLOCK(scsi_mib_index_lock);
209 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
210
211 /*
212  * Allocate a new row index for the entry type specified
213  */
214 u32 scsi_get_new_index(scsi_index_t type)
215 {
216         u32 new_index;
217
218         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
219
220         spin_lock(&scsi_mib_index_lock);
221         new_index = ++scsi_mib_index[type];
222         spin_unlock(&scsi_mib_index_lock);
223
224         return new_index;
225 }
226
227 void transport_init_queue_obj(struct se_queue_obj *qobj)
228 {
229         atomic_set(&qobj->queue_cnt, 0);
230         INIT_LIST_HEAD(&qobj->qobj_list);
231         init_waitqueue_head(&qobj->thread_wq);
232         spin_lock_init(&qobj->cmd_queue_lock);
233 }
234 EXPORT_SYMBOL(transport_init_queue_obj);
235
236 static int transport_subsystem_reqmods(void)
237 {
238         int ret;
239
240         ret = request_module("target_core_iblock");
241         if (ret != 0)
242                 pr_err("Unable to load target_core_iblock\n");
243
244         ret = request_module("target_core_file");
245         if (ret != 0)
246                 pr_err("Unable to load target_core_file\n");
247
248         ret = request_module("target_core_pscsi");
249         if (ret != 0)
250                 pr_err("Unable to load target_core_pscsi\n");
251
252         ret = request_module("target_core_stgt");
253         if (ret != 0)
254                 pr_err("Unable to load target_core_stgt\n");
255
256         return 0;
257 }
258
259 int transport_subsystem_check_init(void)
260 {
261         int ret;
262
263         if (sub_api_initialized)
264                 return 0;
265         /*
266          * Request the loading of known TCM subsystem plugins..
267          */
268         ret = transport_subsystem_reqmods();
269         if (ret < 0)
270                 return ret;
271
272         sub_api_initialized = 1;
273         return 0;
274 }
275
276 struct se_session *transport_init_session(void)
277 {
278         struct se_session *se_sess;
279
280         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
281         if (!se_sess) {
282                 pr_err("Unable to allocate struct se_session from"
283                                 " se_sess_cache\n");
284                 return ERR_PTR(-ENOMEM);
285         }
286         INIT_LIST_HEAD(&se_sess->sess_list);
287         INIT_LIST_HEAD(&se_sess->sess_acl_list);
288
289         return se_sess;
290 }
291 EXPORT_SYMBOL(transport_init_session);
292
293 /*
294  * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
295  */
296 void __transport_register_session(
297         struct se_portal_group *se_tpg,
298         struct se_node_acl *se_nacl,
299         struct se_session *se_sess,
300         void *fabric_sess_ptr)
301 {
302         unsigned char buf[PR_REG_ISID_LEN];
303
304         se_sess->se_tpg = se_tpg;
305         se_sess->fabric_sess_ptr = fabric_sess_ptr;
306         /*
307          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
308          *
309          * Only set for struct se_session's that will actually be moving I/O.
310          * eg: *NOT* discovery sessions.
311          */
312         if (se_nacl) {
313                 /*
314                  * If the fabric module supports an ISID based TransportID,
315                  * save this value in binary from the fabric I_T Nexus now.
316                  */
317                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
318                         memset(&buf[0], 0, PR_REG_ISID_LEN);
319                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
320                                         &buf[0], PR_REG_ISID_LEN);
321                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
322                 }
323                 spin_lock_irq(&se_nacl->nacl_sess_lock);
324                 /*
325                  * The se_nacl->nacl_sess pointer will be set to the
326                  * last active I_T Nexus for each struct se_node_acl.
327                  */
328                 se_nacl->nacl_sess = se_sess;
329
330                 list_add_tail(&se_sess->sess_acl_list,
331                               &se_nacl->acl_sess_list);
332                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
333         }
334         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
335
336         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
337                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
338 }
339 EXPORT_SYMBOL(__transport_register_session);
340
341 void transport_register_session(
342         struct se_portal_group *se_tpg,
343         struct se_node_acl *se_nacl,
344         struct se_session *se_sess,
345         void *fabric_sess_ptr)
346 {
347         spin_lock_bh(&se_tpg->session_lock);
348         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
349         spin_unlock_bh(&se_tpg->session_lock);
350 }
351 EXPORT_SYMBOL(transport_register_session);
352
353 void transport_deregister_session_configfs(struct se_session *se_sess)
354 {
355         struct se_node_acl *se_nacl;
356         unsigned long flags;
357         /*
358          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
359          */
360         se_nacl = se_sess->se_node_acl;
361         if (se_nacl) {
362                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
363                 list_del(&se_sess->sess_acl_list);
364                 /*
365                  * If the session list is empty, then clear the pointer.
366                  * Otherwise, set the struct se_session pointer from the tail
367                  * element of the per struct se_node_acl active session list.
368                  */
369                 if (list_empty(&se_nacl->acl_sess_list))
370                         se_nacl->nacl_sess = NULL;
371                 else {
372                         se_nacl->nacl_sess = container_of(
373                                         se_nacl->acl_sess_list.prev,
374                                         struct se_session, sess_acl_list);
375                 }
376                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
377         }
378 }
379 EXPORT_SYMBOL(transport_deregister_session_configfs);
380
381 void transport_free_session(struct se_session *se_sess)
382 {
383         kmem_cache_free(se_sess_cache, se_sess);
384 }
385 EXPORT_SYMBOL(transport_free_session);
386
387 void transport_deregister_session(struct se_session *se_sess)
388 {
389         struct se_portal_group *se_tpg = se_sess->se_tpg;
390         struct se_node_acl *se_nacl;
391         unsigned long flags;
392
393         if (!se_tpg) {
394                 transport_free_session(se_sess);
395                 return;
396         }
397
398         spin_lock_irqsave(&se_tpg->session_lock, flags);
399         list_del(&se_sess->sess_list);
400         se_sess->se_tpg = NULL;
401         se_sess->fabric_sess_ptr = NULL;
402         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
403
404         /*
405          * Determine if we need to do extra work for this initiator node's
406          * struct se_node_acl if it had been previously dynamically generated.
407          */
408         se_nacl = se_sess->se_node_acl;
409         if (se_nacl) {
410                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
411                 if (se_nacl->dynamic_node_acl) {
412                         if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
413                                         se_tpg)) {
414                                 list_del(&se_nacl->acl_list);
415                                 se_tpg->num_node_acls--;
416                                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
417
418                                 core_tpg_wait_for_nacl_pr_ref(se_nacl);
419                                 core_free_device_list_for_node(se_nacl, se_tpg);
420                                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
421                                                 se_nacl);
422                                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
423                         }
424                 }
425                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
426         }
427
428         transport_free_session(se_sess);
429
430         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
431                 se_tpg->se_tpg_tfo->get_fabric_name());
432 }
433 EXPORT_SYMBOL(transport_deregister_session);
434
435 /*
436  * Called with cmd->t_state_lock held.
437  */
438 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
439 {
440         struct se_device *dev;
441         struct se_task *task;
442         unsigned long flags;
443
444         list_for_each_entry(task, &cmd->t_task_list, t_list) {
445                 dev = task->se_dev;
446                 if (!dev)
447                         continue;
448
449                 if (atomic_read(&task->task_active))
450                         continue;
451
452                 if (!atomic_read(&task->task_state_active))
453                         continue;
454
455                 spin_lock_irqsave(&dev->execute_task_lock, flags);
456                 list_del(&task->t_state_list);
457                 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
458                         cmd->se_tfo->get_task_tag(cmd), dev, task);
459                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
460
461                 atomic_set(&task->task_state_active, 0);
462                 atomic_dec(&cmd->t_task_cdbs_ex_left);
463         }
464 }
465
466 /*      transport_cmd_check_stop():
467  *
468  *      'transport_off = 1' determines if t_transport_active should be cleared.
469  *      'transport_off = 2' determines if task_dev_state should be removed.
470  *
471  *      A non-zero u8 t_state sets cmd->t_state.
472  *      Returns 1 when command is stopped, else 0.
473  */
474 static int transport_cmd_check_stop(
475         struct se_cmd *cmd,
476         int transport_off,
477         u8 t_state)
478 {
479         unsigned long flags;
480
481         spin_lock_irqsave(&cmd->t_state_lock, flags);
482         /*
483          * Determine if IOCTL context caller in requesting the stopping of this
484          * command for LUN shutdown purposes.
485          */
486         if (atomic_read(&cmd->transport_lun_stop)) {
487                 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
488                         " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
489                         cmd->se_tfo->get_task_tag(cmd));
490
491                 cmd->deferred_t_state = cmd->t_state;
492                 cmd->t_state = TRANSPORT_DEFERRED_CMD;
493                 atomic_set(&cmd->t_transport_active, 0);
494                 if (transport_off == 2)
495                         transport_all_task_dev_remove_state(cmd);
496                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
497
498                 complete(&cmd->transport_lun_stop_comp);
499                 return 1;
500         }
501         /*
502          * Determine if frontend context caller is requesting the stopping of
503          * this command for frontend exceptions.
504          */
505         if (atomic_read(&cmd->t_transport_stop)) {
506                 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
507                         " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
508                         cmd->se_tfo->get_task_tag(cmd));
509
510                 cmd->deferred_t_state = cmd->t_state;
511                 cmd->t_state = TRANSPORT_DEFERRED_CMD;
512                 if (transport_off == 2)
513                         transport_all_task_dev_remove_state(cmd);
514
515                 /*
516                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
517                  * to FE.
518                  */
519                 if (transport_off == 2)
520                         cmd->se_lun = NULL;
521                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
522
523                 complete(&cmd->t_transport_stop_comp);
524                 return 1;
525         }
526         if (transport_off) {
527                 atomic_set(&cmd->t_transport_active, 0);
528                 if (transport_off == 2) {
529                         transport_all_task_dev_remove_state(cmd);
530                         /*
531                          * Clear struct se_cmd->se_lun before the transport_off == 2
532                          * handoff to fabric module.
533                          */
534                         cmd->se_lun = NULL;
535                         /*
536                          * Some fabric modules like tcm_loop can release
537                          * their internally allocated I/O reference now and
538                          * struct se_cmd now.
539                          */
540                         if (cmd->se_tfo->check_stop_free != NULL) {
541                                 spin_unlock_irqrestore(
542                                         &cmd->t_state_lock, flags);
543
544                                 cmd->se_tfo->check_stop_free(cmd);
545                                 return 1;
546                         }
547                 }
548                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
549
550                 return 0;
551         } else if (t_state)
552                 cmd->t_state = t_state;
553         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
554
555         return 0;
556 }
557
558 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
559 {
560         return transport_cmd_check_stop(cmd, 2, 0);
561 }
562
563 static void transport_lun_remove_cmd(struct se_cmd *cmd)
564 {
565         struct se_lun *lun = cmd->se_lun;
566         unsigned long flags;
567
568         if (!lun)
569                 return;
570
571         spin_lock_irqsave(&cmd->t_state_lock, flags);
572         if (!atomic_read(&cmd->transport_dev_active)) {
573                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
574                 goto check_lun;
575         }
576         atomic_set(&cmd->transport_dev_active, 0);
577         transport_all_task_dev_remove_state(cmd);
578         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
579
580
581 check_lun:
582         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
583         if (atomic_read(&cmd->transport_lun_active)) {
584                 list_del(&cmd->se_lun_node);
585                 atomic_set(&cmd->transport_lun_active, 0);
586 #if 0
587                 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
588                         cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
589 #endif
590         }
591         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
592 }
593
594 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
595 {
596         transport_lun_remove_cmd(cmd);
597
598         if (transport_cmd_check_stop_to_fabric(cmd))
599                 return;
600         if (remove) {
601                 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
602                 transport_generic_remove(cmd, 0);
603         }
604 }
605
606 void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
607 {
608         transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
609
610         if (transport_cmd_check_stop_to_fabric(cmd))
611                 return;
612
613         transport_generic_remove(cmd, 0);
614 }
615
616 static void transport_add_cmd_to_queue(
617         struct se_cmd *cmd,
618         int t_state)
619 {
620         struct se_device *dev = cmd->se_dev;
621         struct se_queue_obj *qobj = &dev->dev_queue_obj;
622         unsigned long flags;
623
624         if (t_state) {
625                 spin_lock_irqsave(&cmd->t_state_lock, flags);
626                 cmd->t_state = t_state;
627                 atomic_set(&cmd->t_transport_active, 1);
628                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
629         }
630
631         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
632
633         /* If the cmd is already on the list, remove it before we add it */
634         if (!list_empty(&cmd->se_queue_node))
635                 list_del(&cmd->se_queue_node);
636         else
637                 atomic_inc(&qobj->queue_cnt);
638
639         if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
640                 cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
641                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
642         } else
643                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
644         atomic_set(&cmd->t_transport_queue_active, 1);
645         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
646
647         wake_up_interruptible(&qobj->thread_wq);
648 }
649
650 static struct se_cmd *
651 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
652 {
653         struct se_cmd *cmd;
654         unsigned long flags;
655
656         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
657         if (list_empty(&qobj->qobj_list)) {
658                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
659                 return NULL;
660         }
661         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
662
663         atomic_set(&cmd->t_transport_queue_active, 0);
664
665         list_del_init(&cmd->se_queue_node);
666         atomic_dec(&qobj->queue_cnt);
667         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
668
669         return cmd;
670 }
671
672 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
673                 struct se_queue_obj *qobj)
674 {
675         unsigned long flags;
676
677         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
678         if (!atomic_read(&cmd->t_transport_queue_active)) {
679                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
680                 return;
681         }
682         atomic_set(&cmd->t_transport_queue_active, 0);
683         atomic_dec(&qobj->queue_cnt);
684         list_del_init(&cmd->se_queue_node);
685         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
686
687         if (atomic_read(&cmd->t_transport_queue_active)) {
688                 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
689                         cmd->se_tfo->get_task_tag(cmd),
690                         atomic_read(&cmd->t_transport_queue_active));
691         }
692 }
693
694 /*
695  * Completion function used by TCM subsystem plugins (such as FILEIO)
696  * for queueing up response from struct se_subsystem_api->do_task()
697  */
698 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
699 {
700         struct se_task *task = list_entry(cmd->t_task_list.next,
701                                 struct se_task, t_list);
702
703         if (good) {
704                 cmd->scsi_status = SAM_STAT_GOOD;
705                 task->task_scsi_status = GOOD;
706         } else {
707                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
708                 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
709                 task->task_se_cmd->transport_error_status =
710                                         PYX_TRANSPORT_ILLEGAL_REQUEST;
711         }
712
713         transport_complete_task(task, good);
714 }
715 EXPORT_SYMBOL(transport_complete_sync_cache);
716
717 /*      transport_complete_task():
718  *
719  *      Called from interrupt and non interrupt context depending
720  *      on the transport plugin.
721  */
722 void transport_complete_task(struct se_task *task, int success)
723 {
724         struct se_cmd *cmd = task->task_se_cmd;
725         struct se_device *dev = task->se_dev;
726         int t_state;
727         unsigned long flags;
728 #if 0
729         pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
730                         cmd->t_task_cdb[0], dev);
731 #endif
732         if (dev)
733                 atomic_inc(&dev->depth_left);
734
735         spin_lock_irqsave(&cmd->t_state_lock, flags);
736         atomic_set(&task->task_active, 0);
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 (atomic_read(&task->task_stop)) {
756                 /*
757                  * Decrement cmd->t_se_count if this task had
758                  * previously thrown its timeout exception handler.
759                  */
760                 if (atomic_read(&task->task_timeout)) {
761                         atomic_dec(&cmd->t_se_count);
762                         atomic_set(&task->task_timeout, 0);
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 (atomic_read(&task->task_timeout)) {
775                 if (!atomic_dec_and_test(
776                                 &cmd->t_task_cdbs_timeout_left)) {
777                         spin_unlock_irqrestore(&cmd->t_state_lock,
778                                 flags);
779                         return;
780                 }
781                 t_state = TRANSPORT_COMPLETE_TIMEOUT;
782                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
783
784                 transport_add_cmd_to_queue(cmd, t_state);
785                 return;
786         }
787         atomic_dec(&cmd->t_task_cdbs_timeout_left);
788
789         /*
790          * Decrement the outstanding t_task_cdbs_left count.  The last
791          * struct se_task from struct se_cmd will complete itself into the
792          * device queue depending upon int success.
793          */
794         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
795                 if (!success)
796                         cmd->t_tasks_failed = 1;
797
798                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
799                 return;
800         }
801
802         if (!success || cmd->t_tasks_failed) {
803                 t_state = TRANSPORT_COMPLETE_FAILURE;
804                 if (!task->task_error_status) {
805                         task->task_error_status =
806                                 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
807                         cmd->transport_error_status =
808                                 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
809                 }
810         } else {
811                 atomic_set(&cmd->t_transport_complete, 1);
812                 t_state = TRANSPORT_COMPLETE_OK;
813         }
814         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
815
816         transport_add_cmd_to_queue(cmd, t_state);
817 }
818 EXPORT_SYMBOL(transport_complete_task);
819
820 /*
821  * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
822  * struct se_task list are ready to be added to the active execution list
823  * struct se_device
824
825  * Called with se_dev_t->execute_task_lock called.
826  */
827 static inline int transport_add_task_check_sam_attr(
828         struct se_task *task,
829         struct se_task *task_prev,
830         struct se_device *dev)
831 {
832         /*
833          * No SAM Task attribute emulation enabled, add to tail of
834          * execution queue
835          */
836         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
837                 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
838                 return 0;
839         }
840         /*
841          * HEAD_OF_QUEUE attribute for received CDB, which means
842          * the first task that is associated with a struct se_cmd goes to
843          * head of the struct se_device->execute_task_list, and task_prev
844          * after that for each subsequent task
845          */
846         if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
847                 list_add(&task->t_execute_list,
848                                 (task_prev != NULL) ?
849                                 &task_prev->t_execute_list :
850                                 &dev->execute_task_list);
851
852                 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
853                                 " in execution queue\n",
854                                 task->task_se_cmd->t_task_cdb[0]);
855                 return 1;
856         }
857         /*
858          * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
859          * transitioned from Dermant -> Active state, and are added to the end
860          * of the struct se_device->execute_task_list
861          */
862         list_add_tail(&task->t_execute_list, &dev->execute_task_list);
863         return 0;
864 }
865
866 /*      __transport_add_task_to_execute_queue():
867  *
868  *      Called with se_dev_t->execute_task_lock called.
869  */
870 static void __transport_add_task_to_execute_queue(
871         struct se_task *task,
872         struct se_task *task_prev,
873         struct se_device *dev)
874 {
875         int head_of_queue;
876
877         head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
878         atomic_inc(&dev->execute_tasks);
879
880         if (atomic_read(&task->task_state_active))
881                 return;
882         /*
883          * Determine if this task needs to go to HEAD_OF_QUEUE for the
884          * state list as well.  Running with SAM Task Attribute emulation
885          * will always return head_of_queue == 0 here
886          */
887         if (head_of_queue)
888                 list_add(&task->t_state_list, (task_prev) ?
889                                 &task_prev->t_state_list :
890                                 &dev->state_task_list);
891         else
892                 list_add_tail(&task->t_state_list, &dev->state_task_list);
893
894         atomic_set(&task->task_state_active, 1);
895
896         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
897                 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
898                 task, dev);
899 }
900
901 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
902 {
903         struct se_device *dev;
904         struct se_task *task;
905         unsigned long flags;
906
907         spin_lock_irqsave(&cmd->t_state_lock, flags);
908         list_for_each_entry(task, &cmd->t_task_list, t_list) {
909                 dev = task->se_dev;
910
911                 if (atomic_read(&task->task_state_active))
912                         continue;
913
914                 spin_lock(&dev->execute_task_lock);
915                 list_add_tail(&task->t_state_list, &dev->state_task_list);
916                 atomic_set(&task->task_state_active, 1);
917
918                 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
919                         task->task_se_cmd->se_tfo->get_task_tag(
920                         task->task_se_cmd), task, dev);
921
922                 spin_unlock(&dev->execute_task_lock);
923         }
924         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
925 }
926
927 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
928 {
929         struct se_device *dev = cmd->se_dev;
930         struct se_task *task, *task_prev = NULL;
931         unsigned long flags;
932
933         spin_lock_irqsave(&dev->execute_task_lock, flags);
934         list_for_each_entry(task, &cmd->t_task_list, t_list) {
935                 if (atomic_read(&task->task_execute_queue))
936                         continue;
937                 /*
938                  * __transport_add_task_to_execute_queue() handles the
939                  * SAM Task Attribute emulation if enabled
940                  */
941                 __transport_add_task_to_execute_queue(task, task_prev, dev);
942                 atomic_set(&task->task_execute_queue, 1);
943                 task_prev = task;
944         }
945         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
946 }
947
948 /*      transport_remove_task_from_execute_queue():
949  *
950  *
951  */
952 void transport_remove_task_from_execute_queue(
953         struct se_task *task,
954         struct se_device *dev)
955 {
956         unsigned long flags;
957
958         if (atomic_read(&task->task_execute_queue) == 0) {
959                 dump_stack();
960                 return;
961         }
962
963         spin_lock_irqsave(&dev->execute_task_lock, flags);
964         list_del(&task->t_execute_list);
965         atomic_set(&task->task_execute_queue, 0);
966         atomic_dec(&dev->execute_tasks);
967         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
968 }
969
970 /*
971  * Handle QUEUE_FULL / -EAGAIN status
972  */
973
974 static void target_qf_do_work(struct work_struct *work)
975 {
976         struct se_device *dev = container_of(work, struct se_device,
977                                         qf_work_queue);
978         LIST_HEAD(qf_cmd_list);
979         struct se_cmd *cmd, *cmd_tmp;
980
981         spin_lock_irq(&dev->qf_cmd_lock);
982         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
983         spin_unlock_irq(&dev->qf_cmd_lock);
984
985         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
986                 list_del(&cmd->se_qf_node);
987                 atomic_dec(&dev->dev_qf_count);
988                 smp_mb__after_atomic_dec();
989
990                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
991                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
992                         (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" :
993                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
994                         : "UNKNOWN");
995                 /*
996                  * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
997                  * has been added to head of queue
998                  */
999                 transport_add_cmd_to_queue(cmd, cmd->t_state);
1000         }
1001 }
1002
1003 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1004 {
1005         switch (cmd->data_direction) {
1006         case DMA_NONE:
1007                 return "NONE";
1008         case DMA_FROM_DEVICE:
1009                 return "READ";
1010         case DMA_TO_DEVICE:
1011                 return "WRITE";
1012         case DMA_BIDIRECTIONAL:
1013                 return "BIDI";
1014         default:
1015                 break;
1016         }
1017
1018         return "UNKNOWN";
1019 }
1020
1021 void transport_dump_dev_state(
1022         struct se_device *dev,
1023         char *b,
1024         int *bl)
1025 {
1026         *bl += sprintf(b + *bl, "Status: ");
1027         switch (dev->dev_status) {
1028         case TRANSPORT_DEVICE_ACTIVATED:
1029                 *bl += sprintf(b + *bl, "ACTIVATED");
1030                 break;
1031         case TRANSPORT_DEVICE_DEACTIVATED:
1032                 *bl += sprintf(b + *bl, "DEACTIVATED");
1033                 break;
1034         case TRANSPORT_DEVICE_SHUTDOWN:
1035                 *bl += sprintf(b + *bl, "SHUTDOWN");
1036                 break;
1037         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1038         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1039                 *bl += sprintf(b + *bl, "OFFLINE");
1040                 break;
1041         default:
1042                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1043                 break;
1044         }
1045
1046         *bl += sprintf(b + *bl, "  Execute/Left/Max Queue Depth: %d/%d/%d",
1047                 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1048                 dev->queue_depth);
1049         *bl += sprintf(b + *bl, "  SectorSize: %u  MaxSectors: %u\n",
1050                 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
1051         *bl += sprintf(b + *bl, "        ");
1052 }
1053
1054 /*      transport_release_all_cmds():
1055  *
1056  *
1057  */
1058 static void transport_release_all_cmds(struct se_device *dev)
1059 {
1060         struct se_cmd *cmd, *tcmd;
1061         int bug_out = 0, t_state;
1062         unsigned long flags;
1063
1064         spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
1065         list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1066                                 se_queue_node) {
1067                 t_state = cmd->t_state;
1068                 list_del_init(&cmd->se_queue_node);
1069                 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
1070                                 flags);
1071
1072                 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
1073                         " t_state: %u directly\n",
1074                         cmd->se_tfo->get_task_tag(cmd),
1075                         cmd->se_tfo->get_cmd_state(cmd), t_state);
1076
1077                 transport_release_fe_cmd(cmd);
1078                 bug_out = 1;
1079
1080                 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
1081         }
1082         spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
1083 #if 0
1084         if (bug_out)
1085                 BUG();
1086 #endif
1087 }
1088
1089 void transport_dump_vpd_proto_id(
1090         struct t10_vpd *vpd,
1091         unsigned char *p_buf,
1092         int p_buf_len)
1093 {
1094         unsigned char buf[VPD_TMP_BUF_SIZE];
1095         int len;
1096
1097         memset(buf, 0, VPD_TMP_BUF_SIZE);
1098         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1099
1100         switch (vpd->protocol_identifier) {
1101         case 0x00:
1102                 sprintf(buf+len, "Fibre Channel\n");
1103                 break;
1104         case 0x10:
1105                 sprintf(buf+len, "Parallel SCSI\n");
1106                 break;
1107         case 0x20:
1108                 sprintf(buf+len, "SSA\n");
1109                 break;
1110         case 0x30:
1111                 sprintf(buf+len, "IEEE 1394\n");
1112                 break;
1113         case 0x40:
1114                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1115                                 " Protocol\n");
1116                 break;
1117         case 0x50:
1118                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1119                 break;
1120         case 0x60:
1121                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1122                 break;
1123         case 0x70:
1124                 sprintf(buf+len, "Automation/Drive Interface Transport"
1125                                 " Protocol\n");
1126                 break;
1127         case 0x80:
1128                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1129                 break;
1130         default:
1131                 sprintf(buf+len, "Unknown 0x%02x\n",
1132                                 vpd->protocol_identifier);
1133                 break;
1134         }
1135
1136         if (p_buf)
1137                 strncpy(p_buf, buf, p_buf_len);
1138         else
1139                 pr_debug("%s", buf);
1140 }
1141
1142 void
1143 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1144 {
1145         /*
1146          * Check if the Protocol Identifier Valid (PIV) bit is set..
1147          *
1148          * from spc3r23.pdf section 7.5.1
1149          */
1150          if (page_83[1] & 0x80) {
1151                 vpd->protocol_identifier = (page_83[0] & 0xf0);
1152                 vpd->protocol_identifier_set = 1;
1153                 transport_dump_vpd_proto_id(vpd, NULL, 0);
1154         }
1155 }
1156 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1157
1158 int transport_dump_vpd_assoc(
1159         struct t10_vpd *vpd,
1160         unsigned char *p_buf,
1161         int p_buf_len)
1162 {
1163         unsigned char buf[VPD_TMP_BUF_SIZE];
1164         int ret = 0;
1165         int len;
1166
1167         memset(buf, 0, VPD_TMP_BUF_SIZE);
1168         len = sprintf(buf, "T10 VPD Identifier Association: ");
1169
1170         switch (vpd->association) {
1171         case 0x00:
1172                 sprintf(buf+len, "addressed logical unit\n");
1173                 break;
1174         case 0x10:
1175                 sprintf(buf+len, "target port\n");
1176                 break;
1177         case 0x20:
1178                 sprintf(buf+len, "SCSI target device\n");
1179                 break;
1180         default:
1181                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1182                 ret = -EINVAL;
1183                 break;
1184         }
1185
1186         if (p_buf)
1187                 strncpy(p_buf, buf, p_buf_len);
1188         else
1189                 pr_debug("%s", buf);
1190
1191         return ret;
1192 }
1193
1194 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1195 {
1196         /*
1197          * The VPD identification association..
1198          *
1199          * from spc3r23.pdf Section 7.6.3.1 Table 297
1200          */
1201         vpd->association = (page_83[1] & 0x30);
1202         return transport_dump_vpd_assoc(vpd, NULL, 0);
1203 }
1204 EXPORT_SYMBOL(transport_set_vpd_assoc);
1205
1206 int transport_dump_vpd_ident_type(
1207         struct t10_vpd *vpd,
1208         unsigned char *p_buf,
1209         int p_buf_len)
1210 {
1211         unsigned char buf[VPD_TMP_BUF_SIZE];
1212         int ret = 0;
1213         int len;
1214
1215         memset(buf, 0, VPD_TMP_BUF_SIZE);
1216         len = sprintf(buf, "T10 VPD Identifier Type: ");
1217
1218         switch (vpd->device_identifier_type) {
1219         case 0x00:
1220                 sprintf(buf+len, "Vendor specific\n");
1221                 break;
1222         case 0x01:
1223                 sprintf(buf+len, "T10 Vendor ID based\n");
1224                 break;
1225         case 0x02:
1226                 sprintf(buf+len, "EUI-64 based\n");
1227                 break;
1228         case 0x03:
1229                 sprintf(buf+len, "NAA\n");
1230                 break;
1231         case 0x04:
1232                 sprintf(buf+len, "Relative target port identifier\n");
1233                 break;
1234         case 0x08:
1235                 sprintf(buf+len, "SCSI name string\n");
1236                 break;
1237         default:
1238                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1239                                 vpd->device_identifier_type);
1240                 ret = -EINVAL;
1241                 break;
1242         }
1243
1244         if (p_buf) {
1245                 if (p_buf_len < strlen(buf)+1)
1246                         return -EINVAL;
1247                 strncpy(p_buf, buf, p_buf_len);
1248         } else {
1249                 pr_debug("%s", buf);
1250         }
1251
1252         return ret;
1253 }
1254
1255 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1256 {
1257         /*
1258          * The VPD identifier type..
1259          *
1260          * from spc3r23.pdf Section 7.6.3.1 Table 298
1261          */
1262         vpd->device_identifier_type = (page_83[1] & 0x0f);
1263         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1264 }
1265 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1266
1267 int transport_dump_vpd_ident(
1268         struct t10_vpd *vpd,
1269         unsigned char *p_buf,
1270         int p_buf_len)
1271 {
1272         unsigned char buf[VPD_TMP_BUF_SIZE];
1273         int ret = 0;
1274
1275         memset(buf, 0, VPD_TMP_BUF_SIZE);
1276
1277         switch (vpd->device_identifier_code_set) {
1278         case 0x01: /* Binary */
1279                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1280                         &vpd->device_identifier[0]);
1281                 break;
1282         case 0x02: /* ASCII */
1283                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1284                         &vpd->device_identifier[0]);
1285                 break;
1286         case 0x03: /* UTF-8 */
1287                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1288                         &vpd->device_identifier[0]);
1289                 break;
1290         default:
1291                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1292                         " 0x%02x", vpd->device_identifier_code_set);
1293                 ret = -EINVAL;
1294                 break;
1295         }
1296
1297         if (p_buf)
1298                 strncpy(p_buf, buf, p_buf_len);
1299         else
1300                 pr_debug("%s", buf);
1301
1302         return ret;
1303 }
1304
1305 int
1306 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1307 {
1308         static const char hex_str[] = "0123456789abcdef";
1309         int j = 0, i = 4; /* offset to start of the identifer */
1310
1311         /*
1312          * The VPD Code Set (encoding)
1313          *
1314          * from spc3r23.pdf Section 7.6.3.1 Table 296
1315          */
1316         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1317         switch (vpd->device_identifier_code_set) {
1318         case 0x01: /* Binary */
1319                 vpd->device_identifier[j++] =
1320                                 hex_str[vpd->device_identifier_type];
1321                 while (i < (4 + page_83[3])) {
1322                         vpd->device_identifier[j++] =
1323                                 hex_str[(page_83[i] & 0xf0) >> 4];
1324                         vpd->device_identifier[j++] =
1325                                 hex_str[page_83[i] & 0x0f];
1326                         i++;
1327                 }
1328                 break;
1329         case 0x02: /* ASCII */
1330         case 0x03: /* UTF-8 */
1331                 while (i < (4 + page_83[3]))
1332                         vpd->device_identifier[j++] = page_83[i++];
1333                 break;
1334         default:
1335                 break;
1336         }
1337
1338         return transport_dump_vpd_ident(vpd, NULL, 0);
1339 }
1340 EXPORT_SYMBOL(transport_set_vpd_ident);
1341
1342 static void core_setup_task_attr_emulation(struct se_device *dev)
1343 {
1344         /*
1345          * If this device is from Target_Core_Mod/pSCSI, disable the
1346          * SAM Task Attribute emulation.
1347          *
1348          * This is currently not available in upsream Linux/SCSI Target
1349          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1350          */
1351         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1352                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1353                 return;
1354         }
1355
1356         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1357         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1358                 " device\n", dev->transport->name,
1359                 dev->transport->get_device_rev(dev));
1360 }
1361
1362 static void scsi_dump_inquiry(struct se_device *dev)
1363 {
1364         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1365         int i, device_type;
1366         /*
1367          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1368          */
1369         pr_debug("  Vendor: ");
1370         for (i = 0; i < 8; i++)
1371                 if (wwn->vendor[i] >= 0x20)
1372                         pr_debug("%c", wwn->vendor[i]);
1373                 else
1374                         pr_debug(" ");
1375
1376         pr_debug("  Model: ");
1377         for (i = 0; i < 16; i++)
1378                 if (wwn->model[i] >= 0x20)
1379                         pr_debug("%c", wwn->model[i]);
1380                 else
1381                         pr_debug(" ");
1382
1383         pr_debug("  Revision: ");
1384         for (i = 0; i < 4; i++)
1385                 if (wwn->revision[i] >= 0x20)
1386                         pr_debug("%c", wwn->revision[i]);
1387                 else
1388                         pr_debug(" ");
1389
1390         pr_debug("\n");
1391
1392         device_type = dev->transport->get_device_type(dev);
1393         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1394         pr_debug("                 ANSI SCSI revision: %02x\n",
1395                                 dev->transport->get_device_rev(dev));
1396 }
1397
1398 struct se_device *transport_add_device_to_core_hba(
1399         struct se_hba *hba,
1400         struct se_subsystem_api *transport,
1401         struct se_subsystem_dev *se_dev,
1402         u32 device_flags,
1403         void *transport_dev,
1404         struct se_dev_limits *dev_limits,
1405         const char *inquiry_prod,
1406         const char *inquiry_rev)
1407 {
1408         int force_pt;
1409         struct se_device  *dev;
1410
1411         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1412         if (!dev) {
1413                 pr_err("Unable to allocate memory for se_dev_t\n");
1414                 return NULL;
1415         }
1416
1417         transport_init_queue_obj(&dev->dev_queue_obj);
1418         dev->dev_flags          = device_flags;
1419         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1420         dev->dev_ptr            = transport_dev;
1421         dev->se_hba             = hba;
1422         dev->se_sub_dev         = se_dev;
1423         dev->transport          = transport;
1424         atomic_set(&dev->active_cmds, 0);
1425         INIT_LIST_HEAD(&dev->dev_list);
1426         INIT_LIST_HEAD(&dev->dev_sep_list);
1427         INIT_LIST_HEAD(&dev->dev_tmr_list);
1428         INIT_LIST_HEAD(&dev->execute_task_list);
1429         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1430         INIT_LIST_HEAD(&dev->ordered_cmd_list);
1431         INIT_LIST_HEAD(&dev->state_task_list);
1432         INIT_LIST_HEAD(&dev->qf_cmd_list);
1433         spin_lock_init(&dev->execute_task_lock);
1434         spin_lock_init(&dev->delayed_cmd_lock);
1435         spin_lock_init(&dev->ordered_cmd_lock);
1436         spin_lock_init(&dev->state_task_lock);
1437         spin_lock_init(&dev->dev_alua_lock);
1438         spin_lock_init(&dev->dev_reservation_lock);
1439         spin_lock_init(&dev->dev_status_lock);
1440         spin_lock_init(&dev->dev_status_thr_lock);
1441         spin_lock_init(&dev->se_port_lock);
1442         spin_lock_init(&dev->se_tmr_lock);
1443         spin_lock_init(&dev->qf_cmd_lock);
1444
1445         dev->queue_depth        = dev_limits->queue_depth;
1446         atomic_set(&dev->depth_left, dev->queue_depth);
1447         atomic_set(&dev->dev_ordered_id, 0);
1448
1449         se_dev_set_default_attribs(dev, dev_limits);
1450
1451         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1452         dev->creation_time = get_jiffies_64();
1453         spin_lock_init(&dev->stats_lock);
1454
1455         spin_lock(&hba->device_lock);
1456         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1457         hba->dev_count++;
1458         spin_unlock(&hba->device_lock);
1459         /*
1460          * Setup the SAM Task Attribute emulation for struct se_device
1461          */
1462         core_setup_task_attr_emulation(dev);
1463         /*
1464          * Force PR and ALUA passthrough emulation with internal object use.
1465          */
1466         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1467         /*
1468          * Setup the Reservations infrastructure for struct se_device
1469          */
1470         core_setup_reservations(dev, force_pt);
1471         /*
1472          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1473          */
1474         if (core_setup_alua(dev, force_pt) < 0)
1475                 goto out;
1476
1477         /*
1478          * Startup the struct se_device processing thread
1479          */
1480         dev->process_thread = kthread_run(transport_processing_thread, dev,
1481                                           "LIO_%s", dev->transport->name);
1482         if (IS_ERR(dev->process_thread)) {
1483                 pr_err("Unable to create kthread: LIO_%s\n",
1484                         dev->transport->name);
1485                 goto out;
1486         }
1487         /*
1488          * Setup work_queue for QUEUE_FULL
1489          */
1490         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1491         /*
1492          * Preload the initial INQUIRY const values if we are doing
1493          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1494          * passthrough because this is being provided by the backend LLD.
1495          * This is required so that transport_get_inquiry() copies these
1496          * originals once back into DEV_T10_WWN(dev) for the virtual device
1497          * setup.
1498          */
1499         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1500                 if (!inquiry_prod || !inquiry_rev) {
1501                         pr_err("All non TCM/pSCSI plugins require"
1502                                 " INQUIRY consts\n");
1503                         goto out;
1504                 }
1505
1506                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1507                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1508                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1509         }
1510         scsi_dump_inquiry(dev);
1511
1512         return dev;
1513 out:
1514         kthread_stop(dev->process_thread);
1515
1516         spin_lock(&hba->device_lock);
1517         list_del(&dev->dev_list);
1518         hba->dev_count--;
1519         spin_unlock(&hba->device_lock);
1520
1521         se_release_vpd_for_dev(dev);
1522
1523         kfree(dev);
1524
1525         return NULL;
1526 }
1527 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1528
1529 /*      transport_generic_prepare_cdb():
1530  *
1531  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1532  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1533  *      The point of this is since we are mapping iSCSI LUNs to
1534  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1535  *      devices and HBAs for a loop.
1536  */
1537 static inline void transport_generic_prepare_cdb(
1538         unsigned char *cdb)
1539 {
1540         switch (cdb[0]) {
1541         case READ_10: /* SBC - RDProtect */
1542         case READ_12: /* SBC - RDProtect */
1543         case READ_16: /* SBC - RDProtect */
1544         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1545         case VERIFY: /* SBC - VRProtect */
1546         case VERIFY_16: /* SBC - VRProtect */
1547         case WRITE_VERIFY: /* SBC - VRProtect */
1548         case WRITE_VERIFY_12: /* SBC - VRProtect */
1549                 break;
1550         default:
1551                 cdb[1] &= 0x1f; /* clear logical unit number */
1552                 break;
1553         }
1554 }
1555
1556 static struct se_task *
1557 transport_generic_get_task(struct se_cmd *cmd,
1558                 enum dma_data_direction data_direction)
1559 {
1560         struct se_task *task;
1561         struct se_device *dev = cmd->se_dev;
1562
1563         task = dev->transport->alloc_task(cmd->t_task_cdb);
1564         if (!task) {
1565                 pr_err("Unable to allocate struct se_task\n");
1566                 return NULL;
1567         }
1568
1569         INIT_LIST_HEAD(&task->t_list);
1570         INIT_LIST_HEAD(&task->t_execute_list);
1571         INIT_LIST_HEAD(&task->t_state_list);
1572         init_completion(&task->task_stop_comp);
1573         task->task_se_cmd = cmd;
1574         task->se_dev = dev;
1575         task->task_data_direction = data_direction;
1576
1577         return task;
1578 }
1579
1580 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1581
1582 /*
1583  * Used by fabric modules containing a local struct se_cmd within their
1584  * fabric dependent per I/O descriptor.
1585  */
1586 void transport_init_se_cmd(
1587         struct se_cmd *cmd,
1588         struct target_core_fabric_ops *tfo,
1589         struct se_session *se_sess,
1590         u32 data_length,
1591         int data_direction,
1592         int task_attr,
1593         unsigned char *sense_buffer)
1594 {
1595         INIT_LIST_HEAD(&cmd->se_lun_node);
1596         INIT_LIST_HEAD(&cmd->se_delayed_node);
1597         INIT_LIST_HEAD(&cmd->se_ordered_node);
1598         INIT_LIST_HEAD(&cmd->se_qf_node);
1599         INIT_LIST_HEAD(&cmd->se_queue_node);
1600
1601         INIT_LIST_HEAD(&cmd->t_task_list);
1602         init_completion(&cmd->transport_lun_fe_stop_comp);
1603         init_completion(&cmd->transport_lun_stop_comp);
1604         init_completion(&cmd->t_transport_stop_comp);
1605         spin_lock_init(&cmd->t_state_lock);
1606         atomic_set(&cmd->transport_dev_active, 1);
1607
1608         cmd->se_tfo = tfo;
1609         cmd->se_sess = se_sess;
1610         cmd->data_length = data_length;
1611         cmd->data_direction = data_direction;
1612         cmd->sam_task_attr = task_attr;
1613         cmd->sense_buffer = sense_buffer;
1614 }
1615 EXPORT_SYMBOL(transport_init_se_cmd);
1616
1617 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1618 {
1619         /*
1620          * Check if SAM Task Attribute emulation is enabled for this
1621          * struct se_device storage object
1622          */
1623         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1624                 return 0;
1625
1626         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1627                 pr_debug("SAM Task Attribute ACA"
1628                         " emulation is not supported\n");
1629                 return -EINVAL;
1630         }
1631         /*
1632          * Used to determine when ORDERED commands should go from
1633          * Dormant to Active status.
1634          */
1635         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1636         smp_mb__after_atomic_inc();
1637         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1638                         cmd->se_ordered_id, cmd->sam_task_attr,
1639                         cmd->se_dev->transport->name);
1640         return 0;
1641 }
1642
1643 void transport_free_se_cmd(
1644         struct se_cmd *se_cmd)
1645 {
1646         if (se_cmd->se_tmr_req)
1647                 core_tmr_release_req(se_cmd->se_tmr_req);
1648         /*
1649          * Check and free any extended CDB buffer that was allocated
1650          */
1651         if (se_cmd->t_task_cdb != se_cmd->__t_task_cdb)
1652                 kfree(se_cmd->t_task_cdb);
1653 }
1654 EXPORT_SYMBOL(transport_free_se_cmd);
1655
1656 static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1657
1658 /*      transport_generic_allocate_tasks():
1659  *
1660  *      Called from fabric RX Thread.
1661  */
1662 int transport_generic_allocate_tasks(
1663         struct se_cmd *cmd,
1664         unsigned char *cdb)
1665 {
1666         int ret;
1667
1668         transport_generic_prepare_cdb(cdb);
1669
1670         /*
1671          * This is needed for early exceptions.
1672          */
1673         cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1674
1675         /*
1676          * Ensure that the received CDB is less than the max (252 + 8) bytes
1677          * for VARIABLE_LENGTH_CMD
1678          */
1679         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1680                 pr_err("Received SCSI CDB with command_size: %d that"
1681                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1682                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1683                 return -EINVAL;
1684         }
1685         /*
1686          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1687          * allocate the additional extended CDB buffer now..  Otherwise
1688          * setup the pointer from __t_task_cdb to t_task_cdb.
1689          */
1690         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1691                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1692                                                 GFP_KERNEL);
1693                 if (!cmd->t_task_cdb) {
1694                         pr_err("Unable to allocate cmd->t_task_cdb"
1695                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1696                                 scsi_command_size(cdb),
1697                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1698                         return -ENOMEM;
1699                 }
1700         } else
1701                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1702         /*
1703          * Copy the original CDB into cmd->
1704          */
1705         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1706         /*
1707          * Setup the received CDB based on SCSI defined opcodes and
1708          * perform unit attention, persistent reservations and ALUA
1709          * checks for virtual device backends.  The cmd->t_task_cdb
1710          * pointer is expected to be setup before we reach this point.
1711          */
1712         ret = transport_generic_cmd_sequencer(cmd, cdb);
1713         if (ret < 0)
1714                 return ret;
1715         /*
1716          * Check for SAM Task Attribute Emulation
1717          */
1718         if (transport_check_alloc_task_attr(cmd) < 0) {
1719                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1720                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1721                 return -EINVAL;
1722         }
1723         spin_lock(&cmd->se_lun->lun_sep_lock);
1724         if (cmd->se_lun->lun_sep)
1725                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1726         spin_unlock(&cmd->se_lun->lun_sep_lock);
1727         return 0;
1728 }
1729 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1730
1731 static void transport_generic_request_failure(struct se_cmd *,
1732                         struct se_device *, int, int);
1733 /*
1734  * Used by fabric module frontends to queue tasks directly.
1735  * Many only be used from process context only
1736  */
1737 int transport_handle_cdb_direct(
1738         struct se_cmd *cmd)
1739 {
1740         int ret;
1741
1742         if (!cmd->se_lun) {
1743                 dump_stack();
1744                 pr_err("cmd->se_lun is NULL\n");
1745                 return -EINVAL;
1746         }
1747         if (in_interrupt()) {
1748                 dump_stack();
1749                 pr_err("transport_generic_handle_cdb cannot be called"
1750                                 " from interrupt context\n");
1751                 return -EINVAL;
1752         }
1753         /*
1754          * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1755          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1756          * in existing usage to ensure that outstanding descriptors are handled
1757          * correctly during shutdown via transport_generic_wait_for_tasks()
1758          *
1759          * Also, we don't take cmd->t_state_lock here as we only expect
1760          * this to be called for initial descriptor submission.
1761          */
1762         cmd->t_state = TRANSPORT_NEW_CMD;
1763         atomic_set(&cmd->t_transport_active, 1);
1764         /*
1765          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1766          * so follow TRANSPORT_NEW_CMD processing thread context usage
1767          * and call transport_generic_request_failure() if necessary..
1768          */
1769         ret = transport_generic_new_cmd(cmd);
1770         if (ret == -EAGAIN)
1771                 return 0;
1772         else if (ret < 0) {
1773                 cmd->transport_error_status = ret;
1774                 transport_generic_request_failure(cmd, NULL, 0,
1775                                 (cmd->data_direction != DMA_TO_DEVICE));
1776         }
1777         return 0;
1778 }
1779 EXPORT_SYMBOL(transport_handle_cdb_direct);
1780
1781 /*
1782  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1783  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1784  * complete setup in TCM process context w/ TFO->new_cmd_map().
1785  */
1786 int transport_generic_handle_cdb_map(
1787         struct se_cmd *cmd)
1788 {
1789         if (!cmd->se_lun) {
1790                 dump_stack();
1791                 pr_err("cmd->se_lun is NULL\n");
1792                 return -EINVAL;
1793         }
1794
1795         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1796         return 0;
1797 }
1798 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1799
1800 /*      transport_generic_handle_data():
1801  *
1802  *
1803  */
1804 int transport_generic_handle_data(
1805         struct se_cmd *cmd)
1806 {
1807         /*
1808          * For the software fabric case, then we assume the nexus is being
1809          * failed/shutdown when signals are pending from the kthread context
1810          * caller, so we return a failure.  For the HW target mode case running
1811          * in interrupt code, the signal_pending() check is skipped.
1812          */
1813         if (!in_interrupt() && signal_pending(current))
1814                 return -EPERM;
1815         /*
1816          * If the received CDB has aleady been ABORTED by the generic
1817          * target engine, we now call transport_check_aborted_status()
1818          * to queue any delated TASK_ABORTED status for the received CDB to the
1819          * fabric module as we are expecting no further incoming DATA OUT
1820          * sequences at this point.
1821          */
1822         if (transport_check_aborted_status(cmd, 1) != 0)
1823                 return 0;
1824
1825         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1826         return 0;
1827 }
1828 EXPORT_SYMBOL(transport_generic_handle_data);
1829
1830 /*      transport_generic_handle_tmr():
1831  *
1832  *
1833  */
1834 int transport_generic_handle_tmr(
1835         struct se_cmd *cmd)
1836 {
1837         /*
1838          * This is needed for early exceptions.
1839          */
1840         cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1841
1842         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1843         return 0;
1844 }
1845 EXPORT_SYMBOL(transport_generic_handle_tmr);
1846
1847 void transport_generic_free_cmd_intr(
1848         struct se_cmd *cmd)
1849 {
1850         transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1851 }
1852 EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1853
1854 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1855 {
1856         struct se_task *task, *task_tmp;
1857         unsigned long flags;
1858         int ret = 0;
1859
1860         pr_debug("ITT[0x%08x] - Stopping tasks\n",
1861                 cmd->se_tfo->get_task_tag(cmd));
1862
1863         /*
1864          * No tasks remain in the execution queue
1865          */
1866         spin_lock_irqsave(&cmd->t_state_lock, flags);
1867         list_for_each_entry_safe(task, task_tmp,
1868                                 &cmd->t_task_list, t_list) {
1869                 pr_debug("task_no[%d] - Processing task %p\n",
1870                                 task->task_no, task);
1871                 /*
1872                  * If the struct se_task has not been sent and is not active,
1873                  * remove the struct se_task from the execution queue.
1874                  */
1875                 if (!atomic_read(&task->task_sent) &&
1876                     !atomic_read(&task->task_active)) {
1877                         spin_unlock_irqrestore(&cmd->t_state_lock,
1878                                         flags);
1879                         transport_remove_task_from_execute_queue(task,
1880                                         task->se_dev);
1881
1882                         pr_debug("task_no[%d] - Removed from execute queue\n",
1883                                 task->task_no);
1884                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1885                         continue;
1886                 }
1887
1888                 /*
1889                  * If the struct se_task is active, sleep until it is returned
1890                  * from the plugin.
1891                  */
1892                 if (atomic_read(&task->task_active)) {
1893                         atomic_set(&task->task_stop, 1);
1894                         spin_unlock_irqrestore(&cmd->t_state_lock,
1895                                         flags);
1896
1897                         pr_debug("task_no[%d] - Waiting to complete\n",
1898                                 task->task_no);
1899                         wait_for_completion(&task->task_stop_comp);
1900                         pr_debug("task_no[%d] - Stopped successfully\n",
1901                                 task->task_no);
1902
1903                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1904                         atomic_dec(&cmd->t_task_cdbs_left);
1905
1906                         atomic_set(&task->task_active, 0);
1907                         atomic_set(&task->task_stop, 0);
1908                 } else {
1909                         pr_debug("task_no[%d] - Did nothing\n", task->task_no);
1910                         ret++;
1911                 }
1912
1913                 __transport_stop_task_timer(task, &flags);
1914         }
1915         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1916
1917         return ret;
1918 }
1919
1920 /*
1921  * Handle SAM-esque emulation for generic transport request failures.
1922  */
1923 static void transport_generic_request_failure(
1924         struct se_cmd *cmd,
1925         struct se_device *dev,
1926         int complete,
1927         int sc)
1928 {
1929         int ret = 0;
1930
1931         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1932                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1933                 cmd->t_task_cdb[0]);
1934         pr_debug("-----[ i_state: %d t_state/def_t_state:"
1935                 " %d/%d transport_error_status: %d\n",
1936                 cmd->se_tfo->get_cmd_state(cmd),
1937                 cmd->t_state, cmd->deferred_t_state,
1938                 cmd->transport_error_status);
1939         pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1940                 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1941                 " t_transport_active: %d t_transport_stop: %d"
1942                 " t_transport_sent: %d\n", cmd->t_task_list_num,
1943                 atomic_read(&cmd->t_task_cdbs_left),
1944                 atomic_read(&cmd->t_task_cdbs_sent),
1945                 atomic_read(&cmd->t_task_cdbs_ex_left),
1946                 atomic_read(&cmd->t_transport_active),
1947                 atomic_read(&cmd->t_transport_stop),
1948                 atomic_read(&cmd->t_transport_sent));
1949
1950         transport_stop_all_task_timers(cmd);
1951
1952         if (dev)
1953                 atomic_inc(&dev->depth_left);
1954         /*
1955          * For SAM Task Attribute emulation for failed struct se_cmd
1956          */
1957         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1958                 transport_complete_task_attr(cmd);
1959
1960         if (complete) {
1961                 transport_direct_request_timeout(cmd);
1962                 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1963         }
1964
1965         switch (cmd->transport_error_status) {
1966         case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1967                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1968                 break;
1969         case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1970                 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1971                 break;
1972         case PYX_TRANSPORT_INVALID_CDB_FIELD:
1973                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1974                 break;
1975         case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1976                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1977                 break;
1978         case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1979                 if (!sc)
1980                         transport_new_cmd_failure(cmd);
1981                 /*
1982                  * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1983                  * we force this session to fall back to session
1984                  * recovery.
1985                  */
1986                 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1987                 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1988
1989                 goto check_stop;
1990         case PYX_TRANSPORT_LU_COMM_FAILURE:
1991         case PYX_TRANSPORT_ILLEGAL_REQUEST:
1992                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1993                 break;
1994         case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1995                 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1996                 break;
1997         case PYX_TRANSPORT_WRITE_PROTECTED:
1998                 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1999                 break;
2000         case PYX_TRANSPORT_RESERVATION_CONFLICT:
2001                 /*
2002                  * No SENSE Data payload for this case, set SCSI Status
2003                  * and queue the response to $FABRIC_MOD.
2004                  *
2005                  * Uses linux/include/scsi/scsi.h SAM status codes defs
2006                  */
2007                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2008                 /*
2009                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2010                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2011                  * CONFLICT STATUS.
2012                  *
2013                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2014                  */
2015                 if (cmd->se_sess &&
2016                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2017                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2018                                 cmd->orig_fe_lun, 0x2C,
2019                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2020
2021                 ret = cmd->se_tfo->queue_status(cmd);
2022                 if (ret == -EAGAIN)
2023                         goto queue_full;
2024                 goto check_stop;
2025         case PYX_TRANSPORT_USE_SENSE_REASON:
2026                 /*
2027                  * struct se_cmd->scsi_sense_reason already set
2028                  */
2029                 break;
2030         default:
2031                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
2032                         cmd->t_task_cdb[0],
2033                         cmd->transport_error_status);
2034                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2035                 break;
2036         }
2037         /*
2038          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2039          * make the call to transport_send_check_condition_and_sense()
2040          * directly.  Otherwise expect the fabric to make the call to
2041          * transport_send_check_condition_and_sense() after handling
2042          * possible unsoliticied write data payloads.
2043          */
2044         if (!sc && !cmd->se_tfo->new_cmd_map)
2045                 transport_new_cmd_failure(cmd);
2046         else {
2047                 ret = transport_send_check_condition_and_sense(cmd,
2048                                 cmd->scsi_sense_reason, 0);
2049                 if (ret == -EAGAIN)
2050                         goto queue_full;
2051         }
2052
2053 check_stop:
2054         transport_lun_remove_cmd(cmd);
2055         if (!transport_cmd_check_stop_to_fabric(cmd))
2056                 ;
2057         return;
2058
2059 queue_full:
2060         cmd->t_state = TRANSPORT_COMPLETE_OK;
2061         transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
2062 }
2063
2064 static void transport_direct_request_timeout(struct se_cmd *cmd)
2065 {
2066         unsigned long flags;
2067
2068         spin_lock_irqsave(&cmd->t_state_lock, flags);
2069         if (!atomic_read(&cmd->t_transport_timeout)) {
2070                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2071                 return;
2072         }
2073         if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2074                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2075                 return;
2076         }
2077
2078         atomic_sub(atomic_read(&cmd->t_transport_timeout),
2079                    &cmd->t_se_count);
2080         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2081 }
2082
2083 static void transport_generic_request_timeout(struct se_cmd *cmd)
2084 {
2085         unsigned long flags;
2086
2087         /*
2088          * Reset cmd->t_se_count to allow transport_generic_remove()
2089          * to allow last call to free memory resources.
2090          */
2091         spin_lock_irqsave(&cmd->t_state_lock, flags);
2092         if (atomic_read(&cmd->t_transport_timeout) > 1) {
2093                 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
2094
2095                 atomic_sub(tmp, &cmd->t_se_count);
2096         }
2097         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2098
2099         transport_generic_remove(cmd, 0);
2100 }
2101
2102 static inline u32 transport_lba_21(unsigned char *cdb)
2103 {
2104         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2105 }
2106
2107 static inline u32 transport_lba_32(unsigned char *cdb)
2108 {
2109         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2110 }
2111
2112 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2113 {
2114         unsigned int __v1, __v2;
2115
2116         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2117         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2118
2119         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2120 }
2121
2122 /*
2123  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2124  */
2125 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2126 {
2127         unsigned int __v1, __v2;
2128
2129         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2130         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2131
2132         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2133 }
2134
2135 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2136 {
2137         unsigned long flags;
2138
2139         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2140         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2141         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2142 }
2143
2144 /*
2145  * Called from interrupt context.
2146  */
2147 static void transport_task_timeout_handler(unsigned long data)
2148 {
2149         struct se_task *task = (struct se_task *)data;
2150         struct se_cmd *cmd = task->task_se_cmd;
2151         unsigned long flags;
2152
2153         pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2154
2155         spin_lock_irqsave(&cmd->t_state_lock, flags);
2156         if (task->task_flags & TF_STOP) {
2157                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2158                 return;
2159         }
2160         task->task_flags &= ~TF_RUNNING;
2161
2162         /*
2163          * Determine if transport_complete_task() has already been called.
2164          */
2165         if (!atomic_read(&task->task_active)) {
2166                 pr_debug("transport task: %p cmd: %p timeout task_active"
2167                                 " == 0\n", task, cmd);
2168                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2169                 return;
2170         }
2171
2172         atomic_inc(&cmd->t_se_count);
2173         atomic_inc(&cmd->t_transport_timeout);
2174         cmd->t_tasks_failed = 1;
2175
2176         atomic_set(&task->task_timeout, 1);
2177         task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2178         task->task_scsi_status = 1;
2179
2180         if (atomic_read(&task->task_stop)) {
2181                 pr_debug("transport task: %p cmd: %p timeout task_stop"
2182                                 " == 1\n", task, cmd);
2183                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2184                 complete(&task->task_stop_comp);
2185                 return;
2186         }
2187
2188         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2189                 pr_debug("transport task: %p cmd: %p timeout non zero"
2190                                 " t_task_cdbs_left\n", task, cmd);
2191                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2192                 return;
2193         }
2194         pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2195                         task, cmd);
2196
2197         cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
2198         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2199
2200         transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2201 }
2202
2203 /*
2204  * Called with cmd->t_state_lock held.
2205  */
2206 static void transport_start_task_timer(struct se_task *task)
2207 {
2208         struct se_device *dev = task->se_dev;
2209         int timeout;
2210
2211         if (task->task_flags & TF_RUNNING)
2212                 return;
2213         /*
2214          * If the task_timeout is disabled, exit now.
2215          */
2216         timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
2217         if (!timeout)
2218                 return;
2219
2220         init_timer(&task->task_timer);
2221         task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2222         task->task_timer.data = (unsigned long) task;
2223         task->task_timer.function = transport_task_timeout_handler;
2224
2225         task->task_flags |= TF_RUNNING;
2226         add_timer(&task->task_timer);
2227 #if 0
2228         pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2229                 " %d\n", task->task_se_cmd, task, timeout);
2230 #endif
2231 }
2232
2233 /*
2234  * Called with spin_lock_irq(&cmd->t_state_lock) held.
2235  */
2236 void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2237 {
2238         struct se_cmd *cmd = task->task_se_cmd;
2239
2240         if (!task->task_flags & TF_RUNNING)
2241                 return;
2242
2243         task->task_flags |= TF_STOP;
2244         spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
2245
2246         del_timer_sync(&task->task_timer);
2247
2248         spin_lock_irqsave(&cmd->t_state_lock, *flags);
2249         task->task_flags &= ~TF_RUNNING;
2250         task->task_flags &= ~TF_STOP;
2251 }
2252
2253 static void transport_stop_all_task_timers(struct se_cmd *cmd)
2254 {
2255         struct se_task *task = NULL, *task_tmp;
2256         unsigned long flags;
2257
2258         spin_lock_irqsave(&cmd->t_state_lock, flags);
2259         list_for_each_entry_safe(task, task_tmp,
2260                                 &cmd->t_task_list, t_list)
2261                 __transport_stop_task_timer(task, &flags);
2262         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2263 }
2264
2265 static inline int transport_tcq_window_closed(struct se_device *dev)
2266 {
2267         if (dev->dev_tcq_window_closed++ <
2268                         PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2269                 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2270         } else
2271                 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2272
2273         wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
2274         return 0;
2275 }
2276
2277 /*
2278  * Called from Fabric Module context from transport_execute_tasks()
2279  *
2280  * The return of this function determins if the tasks from struct se_cmd
2281  * get added to the execution queue in transport_execute_tasks(),
2282  * or are added to the delayed or ordered lists here.
2283  */
2284 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2285 {
2286         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2287                 return 1;
2288         /*
2289          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2290          * to allow the passed struct se_cmd list of tasks to the front of the list.
2291          */
2292          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2293                 atomic_inc(&cmd->se_dev->dev_hoq_count);
2294                 smp_mb__after_atomic_inc();
2295                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2296                         " 0x%02x, se_ordered_id: %u\n",
2297                         cmd->t_task_cdb[0],
2298                         cmd->se_ordered_id);
2299                 return 1;
2300         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2301                 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2302                 list_add_tail(&cmd->se_ordered_node,
2303                                 &cmd->se_dev->ordered_cmd_list);
2304                 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2305
2306                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2307                 smp_mb__after_atomic_inc();
2308
2309                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2310                                 " list, se_ordered_id: %u\n",
2311                                 cmd->t_task_cdb[0],
2312                                 cmd->se_ordered_id);
2313                 /*
2314                  * Add ORDERED command to tail of execution queue if
2315                  * no other older commands exist that need to be
2316                  * completed first.
2317                  */
2318                 if (!atomic_read(&cmd->se_dev->simple_cmds))
2319                         return 1;
2320         } else {
2321                 /*
2322                  * For SIMPLE and UNTAGGED Task Attribute commands
2323                  */
2324                 atomic_inc(&cmd->se_dev->simple_cmds);
2325                 smp_mb__after_atomic_inc();
2326         }
2327         /*
2328          * Otherwise if one or more outstanding ORDERED task attribute exist,
2329          * add the dormant task(s) built for the passed struct se_cmd to the
2330          * execution queue and become in Active state for this struct se_device.
2331          */
2332         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2333                 /*
2334                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
2335                  * will be drained upon completion of HEAD_OF_QUEUE task.
2336                  */
2337                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2338                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2339                 list_add_tail(&cmd->se_delayed_node,
2340                                 &cmd->se_dev->delayed_cmd_list);
2341                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2342
2343                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2344                         " delayed CMD list, se_ordered_id: %u\n",
2345                         cmd->t_task_cdb[0], cmd->sam_task_attr,
2346                         cmd->se_ordered_id);
2347                 /*
2348                  * Return zero to let transport_execute_tasks() know
2349                  * not to add the delayed tasks to the execution list.
2350                  */
2351                 return 0;
2352         }
2353         /*
2354          * Otherwise, no ORDERED task attributes exist..
2355          */
2356         return 1;
2357 }
2358
2359 /*
2360  * Called from fabric module context in transport_generic_new_cmd() and
2361  * transport_generic_process_write()
2362  */
2363 static int transport_execute_tasks(struct se_cmd *cmd)
2364 {
2365         int add_tasks;
2366
2367         if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2368                 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2369                 transport_generic_request_failure(cmd, NULL, 0, 1);
2370                 return 0;
2371         }
2372
2373         /*
2374          * Call transport_cmd_check_stop() to see if a fabric exception
2375          * has occurred that prevents execution.
2376          */
2377         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2378                 /*
2379                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2380                  * attribute for the tasks of the received struct se_cmd CDB
2381                  */
2382                 add_tasks = transport_execute_task_attr(cmd);
2383                 if (!add_tasks)
2384                         goto execute_tasks;
2385                 /*
2386                  * This calls transport_add_tasks_from_cmd() to handle
2387                  * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2388                  * (if enabled) in __transport_add_task_to_execute_queue() and
2389                  * transport_add_task_check_sam_attr().
2390                  */
2391                 transport_add_tasks_from_cmd(cmd);
2392         }
2393         /*
2394          * Kick the execution queue for the cmd associated struct se_device
2395          * storage object.
2396          */
2397 execute_tasks:
2398         __transport_execute_tasks(cmd->se_dev);
2399         return 0;
2400 }
2401
2402 /*
2403  * Called to check struct se_device tcq depth window, and once open pull struct se_task
2404  * from struct se_device->execute_task_list and
2405  *
2406  * Called from transport_processing_thread()
2407  */
2408 static int __transport_execute_tasks(struct se_device *dev)
2409 {
2410         int error;
2411         struct se_cmd *cmd = NULL;
2412         struct se_task *task = NULL;
2413         unsigned long flags;
2414
2415         /*
2416          * Check if there is enough room in the device and HBA queue to send
2417          * struct se_tasks to the selected transport.
2418          */
2419 check_depth:
2420         if (!atomic_read(&dev->depth_left))
2421                 return transport_tcq_window_closed(dev);
2422
2423         dev->dev_tcq_window_closed = 0;
2424
2425         spin_lock_irq(&dev->execute_task_lock);
2426         if (list_empty(&dev->execute_task_list)) {
2427                 spin_unlock_irq(&dev->execute_task_lock);
2428                 return 0;
2429         }
2430         task = list_first_entry(&dev->execute_task_list,
2431                                 struct se_task, t_execute_list);
2432         list_del(&task->t_execute_list);
2433         atomic_set(&task->task_execute_queue, 0);
2434         atomic_dec(&dev->execute_tasks);
2435         spin_unlock_irq(&dev->execute_task_lock);
2436
2437         atomic_dec(&dev->depth_left);
2438
2439         cmd = task->task_se_cmd;
2440
2441         spin_lock_irqsave(&cmd->t_state_lock, flags);
2442         atomic_set(&task->task_active, 1);
2443         atomic_set(&task->task_sent, 1);
2444         atomic_inc(&cmd->t_task_cdbs_sent);
2445
2446         if (atomic_read(&cmd->t_task_cdbs_sent) ==
2447             cmd->t_task_list_num)
2448                 atomic_set(&cmd->transport_sent, 1);
2449
2450         transport_start_task_timer(task);
2451         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2452         /*
2453          * The struct se_cmd->transport_emulate_cdb() function pointer is used
2454          * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2455          * struct se_subsystem_api->do_task() caller below.
2456          */
2457         if (cmd->transport_emulate_cdb) {
2458                 error = cmd->transport_emulate_cdb(cmd);
2459                 if (error != 0) {
2460                         cmd->transport_error_status = error;
2461                         atomic_set(&task->task_active, 0);
2462                         atomic_set(&cmd->transport_sent, 0);
2463                         transport_stop_tasks_for_cmd(cmd);
2464                         transport_generic_request_failure(cmd, dev, 0, 1);
2465                         goto check_depth;
2466                 }
2467                 /*
2468                  * Handle the successful completion for transport_emulate_cdb()
2469                  * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2470                  * Otherwise the caller is expected to complete the task with
2471                  * proper status.
2472                  */
2473                 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2474                         cmd->scsi_status = SAM_STAT_GOOD;
2475                         task->task_scsi_status = GOOD;
2476                         transport_complete_task(task, 1);
2477                 }
2478         } else {
2479                 /*
2480                  * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2481                  * RAMDISK we use the internal transport_emulate_control_cdb() logic
2482                  * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2483                  * LUN emulation code.
2484                  *
2485                  * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2486                  * call ->do_task() directly and let the underlying TCM subsystem plugin
2487                  * code handle the CDB emulation.
2488                  */
2489                 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2490                     (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2491                         error = transport_emulate_control_cdb(task);
2492                 else
2493                         error = dev->transport->do_task(task);
2494
2495                 if (error != 0) {
2496                         cmd->transport_error_status = error;
2497                         atomic_set(&task->task_active, 0);
2498                         atomic_set(&cmd->transport_sent, 0);
2499                         transport_stop_tasks_for_cmd(cmd);
2500                         transport_generic_request_failure(cmd, dev, 0, 1);
2501                 }
2502         }
2503
2504         goto check_depth;
2505
2506         return 0;
2507 }
2508
2509 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2510 {
2511         unsigned long flags;
2512         /*
2513          * Any unsolicited data will get dumped for failed command inside of
2514          * the fabric plugin
2515          */
2516         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2517         se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2518         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2519         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2520 }
2521
2522 static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2523
2524 static inline u32 transport_get_sectors_6(
2525         unsigned char *cdb,
2526         struct se_cmd *cmd,
2527         int *ret)
2528 {
2529         struct se_device *dev = cmd->se_dev;
2530
2531         /*
2532          * Assume TYPE_DISK for non struct se_device objects.
2533          * Use 8-bit sector value.
2534          */
2535         if (!dev)
2536                 goto type_disk;
2537
2538         /*
2539          * Use 24-bit allocation length for TYPE_TAPE.
2540          */
2541         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2542                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2543
2544         /*
2545          * Everything else assume TYPE_DISK Sector CDB location.
2546          * Use 8-bit sector value.
2547          */
2548 type_disk:
2549         return (u32)cdb[4];
2550 }
2551
2552 static inline u32 transport_get_sectors_10(
2553         unsigned char *cdb,
2554         struct se_cmd *cmd,
2555         int *ret)
2556 {
2557         struct se_device *dev = cmd->se_dev;
2558
2559         /*
2560          * Assume TYPE_DISK for non struct se_device objects.
2561          * Use 16-bit sector value.
2562          */
2563         if (!dev)
2564                 goto type_disk;
2565
2566         /*
2567          * XXX_10 is not defined in SSC, throw an exception
2568          */
2569         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2570                 *ret = -EINVAL;
2571                 return 0;
2572         }
2573
2574         /*
2575          * Everything else assume TYPE_DISK Sector CDB location.
2576          * Use 16-bit sector value.
2577          */
2578 type_disk:
2579         return (u32)(cdb[7] << 8) + cdb[8];
2580 }
2581
2582 static inline u32 transport_get_sectors_12(
2583         unsigned char *cdb,
2584         struct se_cmd *cmd,
2585         int *ret)
2586 {
2587         struct se_device *dev = cmd->se_dev;
2588
2589         /*
2590          * Assume TYPE_DISK for non struct se_device objects.
2591          * Use 32-bit sector value.
2592          */
2593         if (!dev)
2594                 goto type_disk;
2595
2596         /*
2597          * XXX_12 is not defined in SSC, throw an exception
2598          */
2599         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2600                 *ret = -EINVAL;
2601                 return 0;
2602         }
2603
2604         /*
2605          * Everything else assume TYPE_DISK Sector CDB location.
2606          * Use 32-bit sector value.
2607          */
2608 type_disk:
2609         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2610 }
2611
2612 static inline u32 transport_get_sectors_16(
2613         unsigned char *cdb,
2614         struct se_cmd *cmd,
2615         int *ret)
2616 {
2617         struct se_device *dev = cmd->se_dev;
2618
2619         /*
2620          * Assume TYPE_DISK for non struct se_device objects.
2621          * Use 32-bit sector value.
2622          */
2623         if (!dev)
2624                 goto type_disk;
2625
2626         /*
2627          * Use 24-bit allocation length for TYPE_TAPE.
2628          */
2629         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2630                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2631
2632 type_disk:
2633         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2634                     (cdb[12] << 8) + cdb[13];
2635 }
2636
2637 /*
2638  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2639  */
2640 static inline u32 transport_get_sectors_32(
2641         unsigned char *cdb,
2642         struct se_cmd *cmd,
2643         int *ret)
2644 {
2645         /*
2646          * Assume TYPE_DISK for non struct se_device objects.
2647          * Use 32-bit sector value.
2648          */
2649         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2650                     (cdb[30] << 8) + cdb[31];
2651
2652 }
2653
2654 static inline u32 transport_get_size(
2655         u32 sectors,
2656         unsigned char *cdb,
2657         struct se_cmd *cmd)
2658 {
2659         struct se_device *dev = cmd->se_dev;
2660
2661         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2662                 if (cdb[1] & 1) { /* sectors */
2663                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2664                 } else /* bytes */
2665                         return sectors;
2666         }
2667 #if 0
2668         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2669                         " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2670                         dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2671                         dev->transport->name);
2672 #endif
2673         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2674 }
2675
2676 static void transport_xor_callback(struct se_cmd *cmd)
2677 {
2678         unsigned char *buf, *addr;
2679         struct scatterlist *sg;
2680         unsigned int offset;
2681         int i;
2682         int count;
2683         /*
2684          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2685          *
2686          * 1) read the specified logical block(s);
2687          * 2) transfer logical blocks from the data-out buffer;
2688          * 3) XOR the logical blocks transferred from the data-out buffer with
2689          *    the logical blocks read, storing the resulting XOR data in a buffer;
2690          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2691          *    blocks transferred from the data-out buffer; and
2692          * 5) transfer the resulting XOR data to the data-in buffer.
2693          */
2694         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2695         if (!buf) {
2696                 pr_err("Unable to allocate xor_callback buf\n");
2697                 return;
2698         }
2699         /*
2700          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2701          * into the locally allocated *buf
2702          */
2703         sg_copy_to_buffer(cmd->t_data_sg,
2704                           cmd->t_data_nents,
2705                           buf,
2706                           cmd->data_length);
2707
2708         /*
2709          * Now perform the XOR against the BIDI read memory located at
2710          * cmd->t_mem_bidi_list
2711          */
2712
2713         offset = 0;
2714         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2715                 addr = kmap_atomic(sg_page(sg), KM_USER0);
2716                 if (!addr)
2717                         goto out;
2718
2719                 for (i = 0; i < sg->length; i++)
2720                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2721
2722                 offset += sg->length;
2723                 kunmap_atomic(addr, KM_USER0);
2724         }
2725
2726 out:
2727         kfree(buf);
2728 }
2729
2730 /*
2731  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2732  */
2733 static int transport_get_sense_data(struct se_cmd *cmd)
2734 {
2735         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2736         struct se_device *dev;
2737         struct se_task *task = NULL, *task_tmp;
2738         unsigned long flags;
2739         u32 offset = 0;
2740
2741         WARN_ON(!cmd->se_lun);
2742
2743         spin_lock_irqsave(&cmd->t_state_lock, flags);
2744         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2745                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2746                 return 0;
2747         }
2748
2749         list_for_each_entry_safe(task, task_tmp,
2750                                 &cmd->t_task_list, t_list) {
2751
2752                 if (!task->task_sense)
2753                         continue;
2754
2755                 dev = task->se_dev;
2756                 if (!dev)
2757                         continue;
2758
2759                 if (!dev->transport->get_sense_buffer) {
2760                         pr_err("dev->transport->get_sense_buffer"
2761                                         " is NULL\n");
2762                         continue;
2763                 }
2764
2765                 sense_buffer = dev->transport->get_sense_buffer(task);
2766                 if (!sense_buffer) {
2767                         pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
2768                                 " sense buffer for task with sense\n",
2769                                 cmd->se_tfo->get_task_tag(cmd), task->task_no);
2770                         continue;
2771                 }
2772                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2773
2774                 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2775                                 TRANSPORT_SENSE_BUFFER);
2776
2777                 memcpy(&buffer[offset], sense_buffer,
2778                                 TRANSPORT_SENSE_BUFFER);
2779                 cmd->scsi_status = task->task_scsi_status;
2780                 /* Automatically padded */
2781                 cmd->scsi_sense_length =
2782                                 (TRANSPORT_SENSE_BUFFER + offset);
2783
2784                 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2785                                 " and sense\n",
2786                         dev->se_hba->hba_id, dev->transport->name,
2787                                 cmd->scsi_status);
2788                 return 0;
2789         }
2790         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2791
2792         return -1;
2793 }
2794
2795 static int
2796 transport_handle_reservation_conflict(struct se_cmd *cmd)
2797 {
2798         cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2799         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2800         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2801         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2802         /*
2803          * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2804          * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2805          * CONFLICT STATUS.
2806          *
2807          * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2808          */
2809         if (cmd->se_sess &&
2810             cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2811                 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2812                         cmd->orig_fe_lun, 0x2C,
2813                         ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2814         return -EINVAL;
2815 }
2816
2817 static inline long long transport_dev_end_lba(struct se_device *dev)
2818 {
2819         return dev->transport->get_blocks(dev) + 1;
2820 }
2821
2822 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2823 {
2824         struct se_device *dev = cmd->se_dev;
2825         u32 sectors;
2826
2827         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2828                 return 0;
2829
2830         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2831
2832         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2833                 pr_err("LBA: %llu Sectors: %u exceeds"
2834                         " transport_dev_end_lba(): %llu\n",
2835                         cmd->t_task_lba, sectors,
2836                         transport_dev_end_lba(dev));
2837                 return -EINVAL;
2838         }
2839
2840         return 0;
2841 }
2842
2843 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2844 {
2845         /*
2846          * Determine if the received WRITE_SAME is used to for direct
2847          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2848          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2849          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2850          */
2851         int passthrough = (dev->transport->transport_type ==
2852                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2853
2854         if (!passthrough) {
2855                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2856                         pr_err("WRITE_SAME PBDATA and LBDATA"
2857                                 " bits not supported for Block Discard"
2858                                 " Emulation\n");
2859                         return -ENOSYS;
2860                 }
2861                 /*
2862                  * Currently for the emulated case we only accept
2863                  * tpws with the UNMAP=1 bit set.
2864                  */
2865                 if (!(flags[0] & 0x08)) {
2866                         pr_err("WRITE_SAME w/o UNMAP bit not"
2867                                 " supported for Block Discard Emulation\n");
2868                         return -ENOSYS;
2869                 }
2870         }
2871
2872         return 0;
2873 }
2874
2875 /*      transport_generic_cmd_sequencer():
2876  *
2877  *      Generic Command Sequencer that should work for most DAS transport
2878  *      drivers.
2879  *
2880  *      Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2881  *      RX Thread.
2882  *
2883  *      FIXME: Need to support other SCSI OPCODES where as well.
2884  */
2885 static int transport_generic_cmd_sequencer(
2886         struct se_cmd *cmd,
2887         unsigned char *cdb)
2888 {
2889         struct se_device *dev = cmd->se_dev;
2890         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2891         int ret = 0, sector_ret = 0, passthrough;
2892         u32 sectors = 0, size = 0, pr_reg_type = 0;
2893         u16 service_action;
2894         u8 alua_ascq = 0;
2895         /*
2896          * Check for an existing UNIT ATTENTION condition
2897          */
2898         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2899                 cmd->transport_wait_for_tasks =
2900                                 &transport_nop_wait_for_tasks;
2901                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2902                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2903                 return -EINVAL;
2904         }
2905         /*
2906          * Check status of Asymmetric Logical Unit Assignment port
2907          */
2908         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2909         if (ret != 0) {
2910                 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2911                 /*
2912                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2913                  * The ALUA additional sense code qualifier (ASCQ) is determined
2914                  * by the ALUA primary or secondary access state..
2915                  */
2916                 if (ret > 0) {
2917 #if 0
2918                         pr_debug("[%s]: ALUA TG Port not available,"
2919                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2920                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2921 #endif
2922                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2923                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2924                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2925                         return -EINVAL;
2926                 }
2927                 goto out_invalid_cdb_field;
2928         }
2929         /*
2930          * Check status for SPC-3 Persistent Reservations
2931          */
2932         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2933                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2934                                         cmd, cdb, pr_reg_type) != 0)
2935                         return transport_handle_reservation_conflict(cmd);
2936                 /*
2937                  * This means the CDB is allowed for the SCSI Initiator port
2938                  * when said port is *NOT* holding the legacy SPC-2 or
2939                  * SPC-3 Persistent Reservation.
2940                  */
2941         }
2942
2943         switch (cdb[0]) {
2944         case READ_6:
2945                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2946                 if (sector_ret)
2947                         goto out_unsupported_cdb;
2948                 size = transport_get_size(sectors, cdb, cmd);
2949                 cmd->transport_split_cdb = &split_cdb_XX_6;
2950                 cmd->t_task_lba = transport_lba_21(cdb);
2951                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2952                 break;
2953         case READ_10:
2954                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2955                 if (sector_ret)
2956                         goto out_unsupported_cdb;
2957                 size = transport_get_size(sectors, cdb, cmd);
2958                 cmd->transport_split_cdb = &split_cdb_XX_10;
2959                 cmd->t_task_lba = transport_lba_32(cdb);
2960                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2961                 break;
2962         case READ_12:
2963                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2964                 if (sector_ret)
2965                         goto out_unsupported_cdb;
2966                 size = transport_get_size(sectors, cdb, cmd);
2967                 cmd->transport_split_cdb = &split_cdb_XX_12;
2968                 cmd->t_task_lba = transport_lba_32(cdb);
2969                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2970                 break;
2971         case READ_16:
2972                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2973                 if (sector_ret)
2974                         goto out_unsupported_cdb;
2975                 size = transport_get_size(sectors, cdb, cmd);
2976                 cmd->transport_split_cdb = &split_cdb_XX_16;
2977                 cmd->t_task_lba = transport_lba_64(cdb);
2978                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2979                 break;
2980         case WRITE_6:
2981                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2982                 if (sector_ret)
2983                         goto out_unsupported_cdb;
2984                 size = transport_get_size(sectors, cdb, cmd);
2985                 cmd->transport_split_cdb = &split_cdb_XX_6;
2986                 cmd->t_task_lba = transport_lba_21(cdb);
2987                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2988                 break;
2989         case WRITE_10:
2990                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2991                 if (sector_ret)
2992                         goto out_unsupported_cdb;
2993                 size = transport_get_size(sectors, cdb, cmd);
2994                 cmd->transport_split_cdb = &split_cdb_XX_10;
2995                 cmd->t_task_lba = transport_lba_32(cdb);
2996                 cmd->t_tasks_fua = (cdb[1] & 0x8);
2997                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2998                 break;
2999         case WRITE_12:
3000                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3001                 if (sector_ret)
3002                         goto out_unsupported_cdb;
3003                 size = transport_get_size(sectors, cdb, cmd);
3004                 cmd->transport_split_cdb = &split_cdb_XX_12;
3005                 cmd->t_task_lba = transport_lba_32(cdb);
3006                 cmd->t_tasks_fua = (cdb[1] & 0x8);
3007                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3008                 break;
3009         case WRITE_16:
3010                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3011                 if (sector_ret)
3012                         goto out_unsupported_cdb;
3013                 size = transport_get_size(sectors, cdb, cmd);
3014                 cmd->transport_split_cdb = &split_cdb_XX_16;
3015                 cmd->t_task_lba = transport_lba_64(cdb);
3016                 cmd->t_tasks_fua = (cdb[1] & 0x8);
3017                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3018                 break;
3019         case XDWRITEREAD_10:
3020                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
3021                     !(cmd->t_tasks_bidi))
3022                         goto out_invalid_cdb_field;
3023                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3024                 if (sector_ret)
3025                         goto out_unsupported_cdb;
3026                 size = transport_get_size(sectors, cdb, cmd);
3027                 cmd->transport_split_cdb = &split_cdb_XX_10;
3028                 cmd->t_task_lba = transport_lba_32(cdb);
3029                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3030                 passthrough = (dev->transport->transport_type ==
3031                                 TRANSPORT_PLUGIN_PHBA_PDEV);
3032                 /*
3033                  * Skip the remaining assignments for TCM/PSCSI passthrough
3034                  */
3035                 if (passthrough)
3036                         break;
3037                 /*
3038                  * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3039                  */
3040                 cmd->transport_complete_callback = &transport_xor_callback;
3041                 cmd->t_tasks_fua = (cdb[1] & 0x8);
3042                 break;
3043         case VARIABLE_LENGTH_CMD:
3044                 service_action = get_unaligned_be16(&cdb[8]);
3045                 /*
3046                  * Determine if this is TCM/PSCSI device and we should disable
3047                  * internal emulation for this CDB.
3048                  */
3049                 passthrough = (dev->transport->transport_type ==
3050                                         TRANSPORT_PLUGIN_PHBA_PDEV);
3051
3052                 switch (service_action) {
3053                 case XDWRITEREAD_32:
3054                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3055                         if (sector_ret)
3056                                 goto out_unsupported_cdb;
3057                         size = transport_get_size(sectors, cdb, cmd);
3058                         /*
3059                          * Use WRITE_32 and READ_32 opcodes for the emulated
3060                          * XDWRITE_READ_32 logic.
3061                          */
3062                         cmd->transport_split_cdb = &split_cdb_XX_32;
3063                         cmd->t_task_lba = transport_lba_64_ext(cdb);
3064                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3065
3066                         /*
3067                          * Skip the remaining assignments for TCM/PSCSI passthrough
3068                          */
3069                         if (passthrough)
3070                                 break;
3071
3072                         /*
3073                          * Setup BIDI XOR callback to be run during
3074                          * transport_generic_complete_ok()
3075                          */
3076                         cmd->transport_complete_callback = &transport_xor_callback;
3077                         cmd->t_tasks_fua = (cdb[10] & 0x8);
3078                         break;
3079                 case WRITE_SAME_32:
3080                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3081                         if (sector_ret)
3082                                 goto out_unsupported_cdb;
3083
3084                         if (sectors)
3085                                 size = transport_get_size(1, cdb, cmd);
3086                         else {
3087                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3088                                        " supported\n");
3089                                 goto out_invalid_cdb_field;
3090                         }
3091
3092                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
3093                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3094
3095                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
3096                                 goto out_invalid_cdb_field;
3097
3098                         break;
3099                 default:
3100                         pr_err("VARIABLE_LENGTH_CMD service action"
3101                                 " 0x%04x not supported\n", service_action);
3102                         goto out_unsupported_cdb;
3103                 }
3104                 break;
3105         case MAINTENANCE_IN:
3106                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3107                         /* MAINTENANCE_IN from SCC-2 */
3108                         /*
3109                          * Check for emulated MI_REPORT_TARGET_PGS.
3110                          */
3111                         if (cdb[1] == MI_REPORT_TARGET_PGS) {
3112                                 cmd->transport_emulate_cdb =
3113                                 (su_dev->t10_alua.alua_type ==
3114                                  SPC3_ALUA_EMULATED) ?
3115                                 core_emulate_report_target_port_groups :
3116                                 NULL;
3117                         }
3118                         size = (cdb[6] << 24) | (cdb[7] << 16) |
3119                                (cdb[8] << 8) | cdb[9];
3120                 } else {
3121                         /* GPCMD_SEND_KEY from multi media commands */
3122                         size = (cdb[8] << 8) + cdb[9];
3123                 }
3124                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3125                 break;
3126         case MODE_SELECT:
3127                 size = cdb[4];
3128                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3129                 break;
3130         case MODE_SELECT_10:
3131                 size = (cdb[7] << 8) + cdb[8];
3132                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3133                 break;
3134         case MODE_SENSE:
3135                 size = cdb[4];
3136                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3137                 break;
3138         case MODE_SENSE_10:
3139         case GPCMD_READ_BUFFER_CAPACITY:
3140         case GPCMD_SEND_OPC:
3141         case LOG_SELECT:
3142         case LOG_SENSE:
3143                 size = (cdb[7] << 8) + cdb[8];
3144                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3145                 break;
3146         case READ_BLOCK_LIMITS:
3147                 size = READ_BLOCK_LEN;
3148                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3149                 break;
3150         case GPCMD_GET_CONFIGURATION:
3151         case GPCMD_READ_FORMAT_CAPACITIES:
3152         case GPCMD_READ_DISC_INFO:
3153         case GPCMD_READ_TRACK_RZONE_INFO:
3154                 size = (cdb[7] << 8) + cdb[8];
3155                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3156                 break;
3157         case PERSISTENT_RESERVE_IN:
3158         case PERSISTENT_RESERVE_OUT:
3159                 cmd->transport_emulate_cdb =
3160                         (su_dev->t10_pr.res_type ==
3161                          SPC3_PERSISTENT_RESERVATIONS) ?
3162                         core_scsi3_emulate_pr : NULL;
3163                 size = (cdb[7] << 8) + cdb[8];
3164                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3165                 break;
3166         case GPCMD_MECHANISM_STATUS:
3167         case GPCMD_READ_DVD_STRUCTURE:
3168                 size = (cdb[8] << 8) + cdb[9];
3169                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3170                 break;
3171         case READ_POSITION:
3172                 size = READ_POSITION_LEN;
3173                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3174                 break;
3175         case MAINTENANCE_OUT:
3176                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3177                         /* MAINTENANCE_OUT from SCC-2
3178                          *
3179                          * Check for emulated MO_SET_TARGET_PGS.
3180                          */
3181                         if (cdb[1] == MO_SET_TARGET_PGS) {
3182                                 cmd->transport_emulate_cdb =
3183                                 (su_dev->t10_alua.alua_type ==
3184                                         SPC3_ALUA_EMULATED) ?
3185                                 core_emulate_set_target_port_groups :
3186                                 NULL;
3187                         }
3188
3189                         size = (cdb[6] << 24) | (cdb[7] << 16) |
3190                                (cdb[8] << 8) | cdb[9];
3191                 } else  {
3192                         /* GPCMD_REPORT_KEY from multi media commands */
3193                         size = (cdb[8] << 8) + cdb[9];
3194                 }
3195                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3196                 break;
3197         case INQUIRY:
3198                 size = (cdb[3] << 8) + cdb[4];
3199                 /*
3200                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3201                  * See spc4r17 section 5.3
3202                  */
3203                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3204                         cmd->sam_task_attr = MSG_HEAD_TAG;
3205                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3206                 break;
3207         case READ_BUFFER:
3208                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3209                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3210                 break;
3211         case READ_CAPACITY:
3212                 size = READ_CAP_LEN;
3213                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3214                 break;
3215         case READ_MEDIA_SERIAL_NUMBER:
3216         case SECURITY_PROTOCOL_IN:
3217         case SECURITY_PROTOCOL_OUT:
3218                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3219                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3220                 break;
3221         case SERVICE_ACTION_IN:
3222         case ACCESS_CONTROL_IN:
3223         case ACCESS_CONTROL_OUT:
3224         case EXTENDED_COPY:
3225         case READ_ATTRIBUTE:
3226         case RECEIVE_COPY_RESULTS:
3227         case WRITE_ATTRIBUTE:
3228                 size = (cdb[10] << 24) | (cdb[11] << 16) |
3229                        (cdb[12] << 8) | cdb[13];
3230                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3231                 break;
3232         case RECEIVE_DIAGNOSTIC:
3233         case SEND_DIAGNOSTIC:
3234                 size = (cdb[3] << 8) | cdb[4];
3235                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3236                 break;
3237 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3238 #if 0
3239         case GPCMD_READ_CD:
3240                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3241                 size = (2336 * sectors);
3242                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3243                 break;
3244 #endif
3245         case READ_TOC:
3246                 size = cdb[8];
3247                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3248                 break;
3249         case REQUEST_SENSE:
3250                 size = cdb[4];
3251                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3252                 break;
3253         case READ_ELEMENT_STATUS:
3254                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3255                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3256                 break;
3257         case WRITE_BUFFER:
3258                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3259                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3260                 break;
3261         case RESERVE:
3262         case RESERVE_10:
3263                 /*
3264                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3265                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
3266                  */
3267                 if (cdb[0] == RESERVE_10)
3268                         size = (cdb[7] << 8) | cdb[8];
3269                 else
3270                         size = cmd->data_length;
3271
3272                 /*
3273                  * Setup the legacy emulated handler for SPC-2 and
3274                  * >= SPC-3 compatible reservation handling (CRH=1)
3275                  * Otherwise, we assume the underlying SCSI logic is
3276                  * is running in SPC_PASSTHROUGH, and wants reservations
3277                  * emulation disabled.
3278                  */
3279                 cmd->transport_emulate_cdb =
3280                                 (su_dev->t10_pr.res_type !=
3281                                  SPC_PASSTHROUGH) ?
3282                                 core_scsi2_emulate_crh : NULL;
3283                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3284                 break;
3285         case RELEASE:
3286         case RELEASE_10:
3287                 /*
3288                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3289                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
3290                 */
3291                 if (cdb[0] == RELEASE_10)
3292                         size = (cdb[7] << 8) | cdb[8];
3293                 else
3294                         size = cmd->data_length;
3295
3296                 cmd->transport_emulate_cdb =
3297                                 (su_dev->t10_pr.res_type !=
3298                                  SPC_PASSTHROUGH) ?
3299                                 core_scsi2_emulate_crh : NULL;
3300                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3301                 break;
3302         case SYNCHRONIZE_CACHE:
3303         case 0x91: /* SYNCHRONIZE_CACHE_16: */
3304                 /*
3305                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3306                  */
3307                 if (cdb[0] == SYNCHRONIZE_CACHE) {
3308                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3309                         cmd->t_task_lba = transport_lba_32(cdb);
3310                 } else {
3311                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3312                         cmd->t_task_lba = transport_lba_64(cdb);
3313                 }
3314                 if (sector_ret)
3315                         goto out_unsupported_cdb;
3316
3317                 size = transport_get_size(sectors, cdb, cmd);
3318                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3319
3320                 /*
3321                  * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3322                  */
3323                 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3324                         break;
3325                 /*
3326                  * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3327                  * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3328                  */
3329                 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3330                 /*
3331                  * Check to ensure that LBA + Range does not exceed past end of
3332                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3333                  */
3334                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3335                         if (transport_cmd_get_valid_sectors(cmd) < 0)
3336                                 goto out_invalid_cdb_field;
3337                 }
3338                 break;
3339         case UNMAP:
3340                 size = get_unaligned_be16(&cdb[7]);
3341                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3342                 break;
3343         case WRITE_SAME_16:
3344                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3345                 if (sector_ret)
3346                         goto out_unsupported_cdb;
3347
3348                 if (sectors)
3349                         size = transport_get_size(1, cdb, cmd);
3350                 else {
3351                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3352                         goto out_invalid_cdb_field;
3353                 }
3354
3355                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3356                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3357
3358                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3359                         goto out_invalid_cdb_field;
3360                 break;
3361         case WRITE_SAME:
3362                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3363                 if (sector_ret)
3364                         goto out_unsupported_cdb;
3365
3366                 if (sectors)
3367                         size = transport_get_size(1, cdb, cmd);
3368                 else {
3369                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3370                         goto out_invalid_cdb_field;
3371                 }
3372
3373                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3374                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3375                 /*
3376                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3377                  * of byte 1 bit 3 UNMAP instead of original reserved field
3378                  */
3379                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3380                         goto out_invalid_cdb_field;
3381                 break;
3382         case ALLOW_MEDIUM_REMOVAL:
3383         case GPCMD_CLOSE_TRACK:
3384         case ERASE:
3385         case INITIALIZE_ELEMENT_STATUS:
3386         case GPCMD_LOAD_UNLOAD:
3387         case REZERO_UNIT:
3388         case SEEK_10:
3389         case GPCMD_SET_SPEED:
3390         case SPACE:
3391         case START_STOP:
3392         case TEST_UNIT_READY:
3393         case VERIFY:
3394         case WRITE_FILEMARKS:
3395         case MOVE_MEDIUM:
3396                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3397                 break;
3398         case REPORT_LUNS:
3399                 cmd->transport_emulate_cdb =
3400                                 transport_core_report_lun_response;
3401                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3402                 /*
3403                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3404                  * See spc4r17 section 5.3
3405                  */
3406                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3407                         cmd->sam_task_attr = MSG_HEAD_TAG;
3408                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3409                 break;
3410         default:
3411                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3412                         " 0x%02x, sending CHECK_CONDITION.\n",
3413                         cmd->se_tfo->get_fabric_name(), cdb[0]);
3414                 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3415                 goto out_unsupported_cdb;
3416         }
3417
3418         if (size != cmd->data_length) {
3419                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3420                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3421                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3422                                 cmd->data_length, size, cdb[0]);
3423
3424                 cmd->cmd_spdtl = size;
3425
3426                 if (cmd->data_direction == DMA_TO_DEVICE) {
3427                         pr_err("Rejecting underflow/overflow"
3428                                         " WRITE data\n");
3429                         goto out_invalid_cdb_field;
3430                 }
3431                 /*
3432                  * Reject READ_* or WRITE_* with overflow/underflow for
3433                  * type SCF_SCSI_DATA_SG_IO_CDB.
3434                  */
3435                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
3436                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3437                                 " CDB on non 512-byte sector setup subsystem"
3438                                 " plugin: %s\n", dev->transport->name);
3439                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3440                         goto out_invalid_cdb_field;
3441                 }
3442
3443                 if (size > cmd->data_length) {
3444                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3445                         cmd->residual_count = (size - cmd->data_length);
3446                 } else {
3447                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3448                         cmd->residual_count = (cmd->data_length - size);
3449                 }
3450                 cmd->data_length = size;
3451         }
3452
3453         /* Let's limit control cdbs to a page, for simplicity's sake. */
3454         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3455             size > PAGE_SIZE)
3456                 goto out_invalid_cdb_field;
3457
3458         transport_set_supported_SAM_opcode(cmd);
3459         return ret;
3460
3461 out_unsupported_cdb:
3462         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3463         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3464         return -EINVAL;
3465 out_invalid_cdb_field:
3466         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3467         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3468         return -EINVAL;
3469 }
3470
3471 /*
3472  * Called from transport_generic_complete_ok() and
3473  * transport_generic_request_failure() to determine which dormant/delayed
3474  * and ordered cmds need to have their tasks added to the execution queue.
3475  */
3476 static void transport_complete_task_attr(struct se_cmd *cmd)
3477 {
3478         struct se_device *dev = cmd->se_dev;
3479         struct se_cmd *cmd_p, *cmd_tmp;
3480         int new_active_tasks = 0;
3481
3482         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3483                 atomic_dec(&dev->simple_cmds);
3484                 smp_mb__after_atomic_dec();
3485                 dev->dev_cur_ordered_id++;
3486                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3487                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3488                         cmd->se_ordered_id);
3489         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3490                 atomic_dec(&dev->dev_hoq_count);
3491                 smp_mb__after_atomic_dec();
3492                 dev->dev_cur_ordered_id++;
3493                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3494                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3495                         cmd->se_ordered_id);
3496         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3497                 spin_lock(&dev->ordered_cmd_lock);
3498                 list_del(&cmd->se_ordered_node);
3499                 atomic_dec(&dev->dev_ordered_sync);
3500                 smp_mb__after_atomic_dec();
3501                 spin_unlock(&dev->ordered_cmd_lock);
3502
3503                 dev->dev_cur_ordered_id++;
3504                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3505                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3506         }
3507         /*
3508          * Process all commands up to the last received
3509          * ORDERED task attribute which requires another blocking
3510          * boundary
3511          */
3512         spin_lock(&dev->delayed_cmd_lock);
3513         list_for_each_entry_safe(cmd_p, cmd_tmp,
3514                         &dev->delayed_cmd_list, se_delayed_node) {
3515
3516                 list_del(&cmd_p->se_delayed_node);
3517                 spin_unlock(&dev->delayed_cmd_lock);
3518
3519                 pr_debug("Calling add_tasks() for"
3520                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3521                         " Dormant -> Active, se_ordered_id: %u\n",
3522                         cmd_p->t_task_cdb[0],
3523                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3524
3525                 transport_add_tasks_from_cmd(cmd_p);
3526                 new_active_tasks++;
3527
3528                 spin_lock(&dev->delayed_cmd_lock);
3529                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3530                         break;
3531         }
3532         spin_unlock(&dev->delayed_cmd_lock);
3533         /*
3534          * If new tasks have become active, wake up the transport thread
3535          * to do the processing of the Active tasks.
3536          */
3537         if (new_active_tasks != 0)
3538                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3539 }
3540
3541 static int transport_complete_qf(struct se_cmd *cmd)
3542 {
3543         int ret = 0;
3544
3545         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
3546                 return cmd->se_tfo->queue_status(cmd);
3547
3548         switch (cmd->data_direction) {
3549         case DMA_FROM_DEVICE:
3550                 ret = cmd->se_tfo->queue_data_in(cmd);
3551                 break;
3552         case DMA_TO_DEVICE:
3553                 if (cmd->t_bidi_data_sg) {
3554                         ret = cmd->se_tfo->queue_data_in(cmd);
3555                         if (ret < 0)
3556                                 return ret;
3557                 }
3558                 /* Fall through for DMA_TO_DEVICE */
3559         case DMA_NONE:
3560                 ret = cmd->se_tfo->queue_status(cmd);
3561                 break;
3562         default:
3563                 break;
3564         }
3565
3566         return ret;
3567 }
3568
3569 static void transport_handle_queue_full(
3570         struct se_cmd *cmd,
3571         struct se_device *dev,
3572         int (*qf_callback)(struct se_cmd *))
3573 {
3574         spin_lock_irq(&dev->qf_cmd_lock);
3575         cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL;
3576         cmd->transport_qf_callback = qf_callback;
3577         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3578         atomic_inc(&dev->dev_qf_count);
3579         smp_mb__after_atomic_inc();
3580         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3581
3582         schedule_work(&cmd->se_dev->qf_work_queue);
3583 }
3584
3585 static void transport_generic_complete_ok(struct se_cmd *cmd)
3586 {
3587         int reason = 0, ret;
3588         /*
3589          * Check if we need to move delayed/dormant tasks from cmds on the
3590          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3591          * Attribute.
3592          */
3593         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3594                 transport_complete_task_attr(cmd);
3595         /*
3596          * Check to schedule QUEUE_FULL work, or execute an existing
3597          * cmd->transport_qf_callback()
3598          */
3599         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3600                 schedule_work(&cmd->se_dev->qf_work_queue);
3601
3602         if (cmd->transport_qf_callback) {
3603                 ret = cmd->transport_qf_callback(cmd);
3604                 if (ret < 0)
3605                         goto queue_full;
3606
3607                 cmd->transport_qf_callback = NULL;
3608                 goto done;
3609         }
3610         /*
3611          * Check if we need to retrieve a sense buffer from
3612          * the struct se_cmd in question.
3613          */
3614         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3615                 if (transport_get_sense_data(cmd) < 0)
3616                         reason = TCM_NON_EXISTENT_LUN;
3617
3618                 /*
3619                  * Only set when an struct se_task->task_scsi_status returned
3620                  * a non GOOD status.
3621                  */
3622                 if (cmd->scsi_status) {
3623                         ret = transport_send_check_condition_and_sense(
3624                                         cmd, reason, 1);
3625                         if (ret == -EAGAIN)
3626                                 goto queue_full;
3627
3628                         transport_lun_remove_cmd(cmd);
3629                         transport_cmd_check_stop_to_fabric(cmd);
3630                         return;
3631                 }
3632         }
3633         /*
3634          * Check for a callback, used by amongst other things
3635          * XDWRITE_READ_10 emulation.
3636          */
3637         if (cmd->transport_complete_callback)
3638                 cmd->transport_complete_callback(cmd);
3639
3640         switch (cmd->data_direction) {
3641         case DMA_FROM_DEVICE:
3642                 spin_lock(&cmd->se_lun->lun_sep_lock);
3643                 if (cmd->se_lun->lun_sep) {
3644                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3645                                         cmd->data_length;
3646                 }
3647                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3648
3649                 ret = cmd->se_tfo->queue_data_in(cmd);
3650                 if (ret == -EAGAIN)
3651                         goto queue_full;
3652                 break;
3653         case DMA_TO_DEVICE:
3654                 spin_lock(&cmd->se_lun->lun_sep_lock);
3655                 if (cmd->se_lun->lun_sep) {
3656                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3657                                 cmd->data_length;
3658                 }
3659                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3660                 /*
3661                  * Check if we need to send READ payload for BIDI-COMMAND
3662                  */
3663                 if (cmd->t_bidi_data_sg) {
3664                         spin_lock(&cmd->se_lun->lun_sep_lock);
3665                         if (cmd->se_lun->lun_sep) {
3666                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3667                                         cmd->data_length;
3668                         }
3669                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3670                         ret = cmd->se_tfo->queue_data_in(cmd);
3671                         if (ret == -EAGAIN)
3672                                 goto queue_full;
3673                         break;
3674                 }
3675                 /* Fall through for DMA_TO_DEVICE */
3676         case DMA_NONE:
3677                 ret = cmd->se_tfo->queue_status(cmd);
3678                 if (ret == -EAGAIN)
3679                         goto queue_full;
3680                 break;
3681         default:
3682                 break;
3683         }
3684
3685 done:
3686         transport_lun_remove_cmd(cmd);
3687         transport_cmd_check_stop_to_fabric(cmd);
3688         return;
3689
3690 queue_full:
3691         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3692                 " data_direction: %d\n", cmd, cmd->data_direction);
3693         transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
3694 }
3695
3696 static void transport_free_dev_tasks(struct se_cmd *cmd)
3697 {
3698         struct se_task *task, *task_tmp;
3699         unsigned long flags;
3700
3701         spin_lock_irqsave(&cmd->t_state_lock, flags);
3702         list_for_each_entry_safe(task, task_tmp,
3703                                 &cmd->t_task_list, t_list) {
3704                 if (atomic_read(&task->task_active))
3705                         continue;
3706
3707                 kfree(task->task_sg_bidi);
3708                 kfree(task->task_sg);
3709
3710                 list_del(&task->t_list);
3711
3712                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3713                 if (task->se_dev)
3714                         task->se_dev->transport->free_task(task);
3715                 else
3716                         pr_err("task[%u] - task->se_dev is NULL\n",
3717                                 task->task_no);
3718                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3719         }
3720         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3721 }
3722
3723 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3724 {
3725         struct scatterlist *sg;
3726         int count;
3727
3728         for_each_sg(sgl, sg, nents, count)
3729                 __free_page(sg_page(sg));
3730
3731         kfree(sgl);
3732 }
3733
3734 static inline void transport_free_pages(struct se_cmd *cmd)
3735 {
3736         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3737                 return;
3738
3739         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3740         cmd->t_data_sg = NULL;
3741         cmd->t_data_nents = 0;
3742
3743         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3744         cmd->t_bidi_data_sg = NULL;
3745         cmd->t_bidi_data_nents = 0;
3746 }
3747
3748 static inline void transport_release_tasks(struct se_cmd *cmd)
3749 {
3750         transport_free_dev_tasks(cmd);
3751 }
3752
3753 static inline int transport_dec_and_check(struct se_cmd *cmd)
3754 {
3755         unsigned long flags;
3756
3757         spin_lock_irqsave(&cmd->t_state_lock, flags);
3758         if (atomic_read(&cmd->t_fe_count)) {
3759                 if (!atomic_dec_and_test(&cmd->t_fe_count)) {
3760                         spin_unlock_irqrestore(&cmd->t_state_lock,
3761                                         flags);
3762                         return 1;
3763                 }
3764         }
3765
3766         if (atomic_read(&cmd->t_se_count)) {
3767                 if (!atomic_dec_and_test(&cmd->t_se_count)) {
3768                         spin_unlock_irqrestore(&cmd->t_state_lock,
3769                                         flags);
3770                         return 1;
3771                 }
3772         }
3773         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3774
3775         return 0;
3776 }
3777
3778 static void transport_release_fe_cmd(struct se_cmd *cmd)
3779 {
3780         unsigned long flags;
3781
3782         if (transport_dec_and_check(cmd))
3783                 return;
3784
3785         spin_lock_irqsave(&cmd->t_state_lock, flags);
3786         if (!atomic_read(&cmd->transport_dev_active)) {
3787                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3788                 goto free_pages;
3789         }
3790         atomic_set(&cmd->transport_dev_active, 0);
3791         transport_all_task_dev_remove_state(cmd);
3792         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3793
3794         transport_release_tasks(cmd);
3795 free_pages:
3796         transport_free_pages(cmd);
3797         transport_free_se_cmd(cmd);
3798         cmd->se_tfo->release_cmd(cmd);
3799 }
3800
3801 static int
3802 transport_generic_remove(struct se_cmd *cmd, int session_reinstatement)
3803 {
3804         unsigned long flags;
3805
3806         if (transport_dec_and_check(cmd)) {
3807                 if (session_reinstatement) {
3808                         spin_lock_irqsave(&cmd->t_state_lock, flags);
3809                         transport_all_task_dev_remove_state(cmd);
3810                         spin_unlock_irqrestore(&cmd->t_state_lock,
3811                                         flags);
3812                 }
3813                 return 1;
3814         }
3815
3816         spin_lock_irqsave(&cmd->t_state_lock, flags);
3817         if (!atomic_read(&cmd->transport_dev_active)) {
3818                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3819                 goto free_pages;
3820         }
3821         atomic_set(&cmd->transport_dev_active, 0);
3822         transport_all_task_dev_remove_state(cmd);
3823         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3824
3825         transport_release_tasks(cmd);
3826
3827 free_pages:
3828         transport_free_pages(cmd);
3829         transport_release_cmd(cmd);
3830         return 0;
3831 }
3832
3833 /*
3834  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3835  * allocating in the core.
3836  * @cmd:  Associated se_cmd descriptor
3837  * @mem:  SGL style memory for TCM WRITE / READ
3838  * @sg_mem_num: Number of SGL elements
3839  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3840  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3841  *
3842  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3843  * of parameters.
3844  */
3845 int transport_generic_map_mem_to_cmd(
3846         struct se_cmd *cmd,
3847         struct scatterlist *sgl,
3848         u32 sgl_count,
3849         struct scatterlist *sgl_bidi,
3850         u32 sgl_bidi_count)
3851 {
3852         if (!sgl || !sgl_count)
3853                 return 0;
3854
3855         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3856             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3857
3858                 cmd->t_data_sg = sgl;
3859                 cmd->t_data_nents = sgl_count;
3860
3861                 if (sgl_bidi && sgl_bidi_count) {
3862                         cmd->t_bidi_data_sg = sgl_bidi;
3863                         cmd->t_bidi_data_nents = sgl_bidi_count;
3864                 }
3865                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3866         }
3867
3868         return 0;
3869 }
3870 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3871
3872 static int transport_new_cmd_obj(struct se_cmd *cmd)
3873 {
3874         struct se_device *dev = cmd->se_dev;
3875         int set_counts = 1, rc, task_cdbs;
3876
3877         /*
3878          * Setup any BIDI READ tasks and memory from
3879          * cmd->t_mem_bidi_list so the READ struct se_tasks
3880          * are queued first for the non pSCSI passthrough case.
3881          */
3882         if (cmd->t_bidi_data_sg &&
3883             (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3884                 rc = transport_allocate_tasks(cmd,
3885                                               cmd->t_task_lba,
3886                                               DMA_FROM_DEVICE,
3887                                               cmd->t_bidi_data_sg,
3888                                               cmd->t_bidi_data_nents);
3889                 if (rc <= 0) {
3890                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3891                         cmd->scsi_sense_reason =
3892                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3893                         return -EINVAL;
3894                 }
3895                 atomic_inc(&cmd->t_fe_count);
3896                 atomic_inc(&cmd->t_se_count);
3897                 set_counts = 0;
3898         }
3899         /*
3900          * Setup the tasks and memory from cmd->t_mem_list
3901          * Note for BIDI transfers this will contain the WRITE payload
3902          */
3903         task_cdbs = transport_allocate_tasks(cmd,
3904                                              cmd->t_task_lba,
3905                                              cmd->data_direction,
3906                                              cmd->t_data_sg,
3907                                              cmd->t_data_nents);
3908         if (task_cdbs <= 0) {
3909                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3910                 cmd->scsi_sense_reason =
3911                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3912                 return -EINVAL;
3913         }
3914
3915         if (set_counts) {
3916                 atomic_inc(&cmd->t_fe_count);
3917                 atomic_inc(&cmd->t_se_count);
3918         }
3919
3920         cmd->t_task_list_num = task_cdbs;
3921
3922         atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3923         atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3924         atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
3925         return 0;
3926 }
3927
3928 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3929 {
3930         struct scatterlist *sg = cmd->t_data_sg;
3931
3932         BUG_ON(!sg);
3933         /*
3934          * We need to take into account a possible offset here for fabrics like
3935          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3936          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3937          */
3938         return kmap(sg_page(sg)) + sg->offset;
3939 }
3940 EXPORT_SYMBOL(transport_kmap_first_data_page);
3941
3942 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3943 {
3944         kunmap(sg_page(cmd->t_data_sg));
3945 }
3946 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3947
3948 static int
3949 transport_generic_get_mem(struct se_cmd *cmd)
3950 {
3951         u32 length = cmd->data_length;
3952         unsigned int nents;
3953         struct page *page;
3954         int i = 0;
3955
3956         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3957         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3958         if (!cmd->t_data_sg)
3959                 return -ENOMEM;
3960
3961         cmd->t_data_nents = nents;
3962         sg_init_table(cmd->t_data_sg, nents);
3963
3964         while (length) {
3965                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3966                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3967                 if (!page)
3968                         goto out;
3969
3970                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3971                 length -= page_len;
3972                 i++;
3973         }
3974         return 0;
3975
3976 out:
3977         while (i >= 0) {
3978                 __free_page(sg_page(&cmd->t_data_sg[i]));
3979                 i--;
3980         }
3981         kfree(cmd->t_data_sg);
3982         cmd->t_data_sg = NULL;
3983         return -ENOMEM;
3984 }
3985
3986 /* Reduce sectors if they are too long for the device */
3987 static inline sector_t transport_limit_task_sectors(
3988         struct se_device *dev,
3989         unsigned long long lba,
3990         sector_t sectors)
3991 {
3992         sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3993
3994         if (dev->transport->get_device_type(dev) == TYPE_DISK)
3995                 if ((lba + sectors) > transport_dev_end_lba(dev))
3996                         sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3997
3998         return sectors;
3999 }
4000
4001
4002 /*
4003  * This function can be used by HW target mode drivers to create a linked
4004  * scatterlist from all contiguously allocated struct se_task->task_sg[].
4005  * This is intended to be called during the completion path by TCM Core
4006  * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4007  */
4008 void transport_do_task_sg_chain(struct se_cmd *cmd)
4009 {
4010         struct scatterlist *sg_first = NULL;
4011         struct scatterlist *sg_prev = NULL;
4012         int sg_prev_nents = 0;
4013         struct scatterlist *sg;
4014         struct se_task *task;
4015         u32 chained_nents = 0;
4016         int i;
4017
4018         BUG_ON(!cmd->se_tfo->task_sg_chaining);
4019
4020         /*
4021          * Walk the struct se_task list and setup scatterlist chains
4022          * for each contiguously allocated struct se_task->task_sg[].
4023          */
4024         list_for_each_entry(task, &cmd->t_task_list, t_list) {
4025                 if (!task->task_sg)
4026                         continue;
4027
4028                 if (!sg_first) {
4029                         sg_first = task->task_sg;
4030                         chained_nents = task->task_sg_nents;
4031                 } else {
4032                         sg_chain(sg_prev, sg_prev_nents, task->task_sg);
4033                         chained_nents += task->task_sg_nents;
4034                 }
4035                 /*
4036                  * For the padded tasks, use the extra SGL vector allocated
4037                  * in transport_allocate_data_tasks() for the sg_prev_nents
4038                  * offset into sg_chain() above..  The last task of a
4039                  * multi-task list, or a single task will not have
4040                  * task->task_sg_padded set..
4041                  */
4042                 if (task->task_padded_sg)
4043                         sg_prev_nents = (task->task_sg_nents + 1);
4044                 else
4045                         sg_prev_nents = task->task_sg_nents;
4046
4047                 sg_prev = task->task_sg;
4048         }
4049         /*
4050          * Setup the starting pointer and total t_tasks_sg_linked_no including
4051          * padding SGs for linking and to mark the end.
4052          */
4053         cmd->t_tasks_sg_chained = sg_first;
4054         cmd->t_tasks_sg_chained_no = chained_nents;
4055
4056         pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
4057                 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
4058                 cmd->t_tasks_sg_chained_no);
4059
4060         for_each_sg(cmd->t_tasks_sg_chained, sg,
4061                         cmd->t_tasks_sg_chained_no, i) {
4062
4063                 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
4064                         i, sg, sg_page(sg), sg->length, sg->offset);
4065                 if (sg_is_chain(sg))
4066                         pr_debug("SG: %p sg_is_chain=1\n", sg);
4067                 if (sg_is_last(sg))
4068                         pr_debug("SG: %p sg_is_last=1\n", sg);
4069         }
4070 }
4071 EXPORT_SYMBOL(transport_do_task_sg_chain);
4072
4073 /*
4074  * Break up cmd into chunks transport can handle
4075  */
4076 static int transport_allocate_data_tasks(
4077         struct se_cmd *cmd,
4078         unsigned long long lba,
4079         enum dma_data_direction data_direction,
4080         struct scatterlist *sgl,
4081         unsigned int sgl_nents)
4082 {
4083         unsigned char *cdb = NULL;
4084         struct se_task *task;
4085         struct se_device *dev = cmd->se_dev;
4086         unsigned long flags;
4087         int task_count, i, ret;
4088         sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
4089         u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
4090         struct scatterlist *sg;
4091         struct scatterlist *cmd_sg;
4092
4093         WARN_ON(cmd->data_length % sector_size);
4094         sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
4095         task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
4096         
4097         cmd_sg = sgl;
4098         for (i = 0; i < task_count; i++) {
4099                 unsigned int task_size, task_sg_nents_padded;
4100                 int count;
4101
4102                 task = transport_generic_get_task(cmd, data_direction);
4103                 if (!task)
4104                         return -ENOMEM;
4105
4106                 task->task_lba = lba;
4107                 task->task_sectors = min(sectors, dev_max_sectors);
4108                 task->task_size = task->task_sectors * sector_size;
4109
4110                 cdb = dev->transport->get_cdb(task);
4111                 BUG_ON(!cdb);
4112
4113                 memcpy(cdb, cmd->t_task_cdb,
4114                        scsi_command_size(cmd->t_task_cdb));
4115
4116                 /* Update new cdb with updated lba/sectors */
4117                 cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
4118                 /*
4119                  * This now assumes that passed sg_ents are in PAGE_SIZE chunks
4120                  * in order to calculate the number per task SGL entries
4121                  */
4122                 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
4123                 /*
4124                  * Check if the fabric module driver is requesting that all
4125                  * struct se_task->task_sg[] be chained together..  If so,
4126                  * then allocate an extra padding SG entry for linking and
4127                  * marking the end of the chained SGL for every task except
4128                  * the last one for (task_count > 1) operation, or skipping
4129                  * the extra padding for the (task_count == 1) case.
4130                  */
4131                 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
4132                         task_sg_nents_padded = (task->task_sg_nents + 1);
4133                         task->task_padded_sg = 1;
4134                 } else
4135                         task_sg_nents_padded = task->task_sg_nents;
4136
4137                 task->task_sg = kmalloc(sizeof(struct scatterlist) *
4138                                         task_sg_nents_padded, GFP_KERNEL);
4139                 if (!task->task_sg) {
4140                         cmd->se_dev->transport->free_task(task);
4141                         return -ENOMEM;
4142                 }
4143
4144                 sg_init_table(task->task_sg, task_sg_nents_padded);
4145
4146                 task_size = task->task_size;
4147
4148                 /* Build new sgl, only up to task_size */
4149                 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
4150                         if (cmd_sg->length > task_size)
4151                                 break;
4152
4153                         *sg = *cmd_sg;
4154                         task_size -= cmd_sg->length;
4155                         cmd_sg = sg_next(cmd_sg);
4156                 }
4157
4158                 lba += task->task_sectors;
4159                 sectors -= task->task_sectors;
4160
4161                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4162                 list_add_tail(&task->t_list, &cmd->t_task_list);
4163                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4164         }
4165         /*
4166          * Now perform the memory map of task->task_sg[] into backend
4167          * subsystem memory..
4168          */
4169         list_for_each_entry(task, &cmd->t_task_list, t_list) {
4170                 if (atomic_read(&task->task_sent))
4171                         continue;
4172                 if (!dev->transport->map_data_SG)
4173                         continue;
4174
4175                 ret = dev->transport->map_data_SG(task);
4176                 if (ret < 0)
4177                         return 0;
4178         }
4179
4180         return task_count;
4181 }
4182
4183 static int
4184 transport_allocate_control_task(struct se_cmd *cmd)
4185 {
4186         struct se_device *dev = cmd->se_dev;
4187         unsigned char *cdb;
4188         struct se_task *task;
4189         unsigned long flags;
4190         int ret = 0;
4191
4192         task = transport_generic_get_task(cmd, cmd->data_direction);
4193         if (!task)
4194                 return -ENOMEM;
4195
4196         cdb = dev->transport->get_cdb(task);
4197         BUG_ON(!cdb);
4198         memcpy(cdb, cmd->t_task_cdb,
4199                scsi_command_size(cmd->t_task_cdb));
4200
4201         task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4202                                 GFP_KERNEL);
4203         if (!task->task_sg) {
4204                 cmd->se_dev->transport->free_task(task);
4205                 return -ENOMEM;
4206         }
4207
4208         memcpy(task->task_sg, cmd->t_data_sg,
4209                sizeof(struct scatterlist) * cmd->t_data_nents);
4210         task->task_size = cmd->data_length;
4211         task->task_sg_nents = cmd->t_data_nents;
4212
4213         spin_lock_irqsave(&cmd->t_state_lock, flags);
4214         list_add_tail(&task->t_list, &cmd->t_task_list);
4215         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4216
4217         if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
4218                 if (dev->transport->map_control_SG)
4219                         ret = dev->transport->map_control_SG(task);
4220         } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4221                 if (dev->transport->cdb_none)
4222                         ret = dev->transport->cdb_none(task);
4223         } else {
4224                 pr_err("target: Unknown control cmd type!\n");
4225                 BUG();
4226         }
4227
4228         /* Success! Return number of tasks allocated */
4229         if (ret == 0)
4230                 return 1;
4231         return ret;
4232 }
4233
4234 static u32 transport_allocate_tasks(
4235         struct se_cmd *cmd,
4236         unsigned long long lba,
4237         enum dma_data_direction data_direction,
4238         struct scatterlist *sgl,
4239         unsigned int sgl_nents)
4240 {
4241         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4242                 if (transport_cmd_get_valid_sectors(cmd) < 0)
4243                         return -EINVAL;
4244
4245                 return transport_allocate_data_tasks(cmd, lba, data_direction,
4246                                                      sgl, sgl_nents);
4247         } else
4248                 return transport_allocate_control_task(cmd);
4249
4250 }
4251
4252
4253 /*       transport_generic_new_cmd(): Called from transport_processing_thread()
4254  *
4255  *       Allocate storage transport resources from a set of values predefined
4256  *       by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4257  *       Any non zero return here is treated as an "out of resource' op here.
4258  */
4259         /*
4260          * Generate struct se_task(s) and/or their payloads for this CDB.
4261          */
4262 int transport_generic_new_cmd(struct se_cmd *cmd)
4263 {
4264         int ret = 0;
4265
4266         /*
4267          * Determine is the TCM fabric module has already allocated physical
4268          * memory, and is directly calling transport_generic_map_mem_to_cmd()
4269          * beforehand.
4270          */
4271         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4272             cmd->data_length) {
4273                 ret = transport_generic_get_mem(cmd);
4274                 if (ret < 0)
4275                         return ret;
4276         }
4277         /*
4278          * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4279          * control or data CDB types, and perform the map to backend subsystem
4280          * code from SGL memory allocated here by transport_generic_get_mem(), or
4281          * via pre-existing SGL memory setup explictly by fabric module code with
4282          * transport_generic_map_mem_to_cmd().
4283          */
4284         ret = transport_new_cmd_obj(cmd);
4285         if (ret < 0)
4286                 return ret;
4287         /*
4288          * For WRITEs, let the fabric know its buffer is ready..
4289          * This WRITE struct se_cmd (and all of its associated struct se_task's)
4290          * will be added to the struct se_device execution queue after its WRITE
4291          * data has arrived. (ie: It gets handled by the transport processing
4292          * thread a second time)
4293          */
4294         if (cmd->data_direction == DMA_TO_DEVICE) {
4295                 transport_add_tasks_to_state_queue(cmd);
4296                 return transport_generic_write_pending(cmd);
4297         }
4298         /*
4299          * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4300          * to the execution queue.
4301          */
4302         transport_execute_tasks(cmd);
4303         return 0;
4304 }
4305 EXPORT_SYMBOL(transport_generic_new_cmd);
4306
4307 /*      transport_generic_process_write():
4308  *
4309  *
4310  */
4311 void transport_generic_process_write(struct se_cmd *cmd)
4312 {
4313         transport_execute_tasks(cmd);
4314 }
4315 EXPORT_SYMBOL(transport_generic_process_write);
4316
4317 static int transport_write_pending_qf(struct se_cmd *cmd)
4318 {
4319         return cmd->se_tfo->write_pending(cmd);
4320 }
4321
4322 /*      transport_generic_write_pending():
4323  *
4324  *
4325  */
4326 static int transport_generic_write_pending(struct se_cmd *cmd)
4327 {
4328         unsigned long flags;
4329         int ret;
4330
4331         spin_lock_irqsave(&cmd->t_state_lock, flags);
4332         cmd->t_state = TRANSPORT_WRITE_PENDING;
4333         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4334
4335         if (cmd->transport_qf_callback) {
4336                 ret = cmd->transport_qf_callback(cmd);
4337                 if (ret == -EAGAIN)
4338                         goto queue_full;
4339                 else if (ret < 0)
4340                         return ret;
4341
4342                 cmd->transport_qf_callback = NULL;
4343                 return 0;
4344         }
4345
4346         /*
4347          * Clear the se_cmd for WRITE_PENDING status in order to set
4348          * cmd->t_transport_active=0 so that transport_generic_handle_data
4349          * can be called from HW target mode interrupt code.  This is safe
4350          * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4351          * because the se_cmd->se_lun pointer is not being cleared.
4352          */
4353         transport_cmd_check_stop(cmd, 1, 0);
4354
4355         /*
4356          * Call the fabric write_pending function here to let the
4357          * frontend know that WRITE buffers are ready.
4358          */
4359         ret = cmd->se_tfo->write_pending(cmd);
4360         if (ret == -EAGAIN)
4361                 goto queue_full;
4362         else if (ret < 0)
4363                 return ret;
4364
4365         return PYX_TRANSPORT_WRITE_PENDING;
4366
4367 queue_full:
4368         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
4369         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4370         transport_handle_queue_full(cmd, cmd->se_dev,
4371                         transport_write_pending_qf);
4372         return ret;
4373 }
4374
4375 void transport_release_cmd(struct se_cmd *cmd)
4376 {
4377         BUG_ON(!cmd->se_tfo);
4378
4379         transport_free_se_cmd(cmd);
4380         cmd->se_tfo->release_cmd(cmd);
4381 }
4382 EXPORT_SYMBOL(transport_release_cmd);
4383
4384 /*      transport_generic_free_cmd():
4385  *
4386  *      Called from processing frontend to release storage engine resources
4387  */
4388 void transport_generic_free_cmd(
4389         struct se_cmd *cmd,
4390         int wait_for_tasks,
4391         int session_reinstatement)
4392 {
4393         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
4394                 transport_release_cmd(cmd);
4395         else {
4396                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4397
4398                 if (cmd->se_lun) {
4399 #if 0
4400                         pr_debug("cmd: %p ITT: 0x%08x contains"
4401                                 " cmd->se_lun\n", cmd,
4402                                 cmd->se_tfo->get_task_tag(cmd));
4403 #endif
4404                         transport_lun_remove_cmd(cmd);
4405                 }
4406
4407                 if (wait_for_tasks && cmd->transport_wait_for_tasks)
4408                         cmd->transport_wait_for_tasks(cmd, 0, 0);
4409
4410                 transport_free_dev_tasks(cmd);
4411
4412                 transport_generic_remove(cmd, session_reinstatement);
4413         }
4414 }
4415 EXPORT_SYMBOL(transport_generic_free_cmd);
4416
4417 static void transport_nop_wait_for_tasks(
4418         struct se_cmd *cmd,
4419         int remove_cmd,
4420         int session_reinstatement)
4421 {
4422         return;
4423 }
4424
4425 /*      transport_lun_wait_for_tasks():
4426  *
4427  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
4428  *      an struct se_lun to be successfully shutdown.
4429  */
4430 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4431 {
4432         unsigned long flags;
4433         int ret;
4434         /*
4435          * If the frontend has already requested this struct se_cmd to
4436          * be stopped, we can safely ignore this struct se_cmd.
4437          */
4438         spin_lock_irqsave(&cmd->t_state_lock, flags);
4439         if (atomic_read(&cmd->t_transport_stop)) {
4440                 atomic_set(&cmd->transport_lun_stop, 0);
4441                 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4442                         " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4443                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4444                 transport_cmd_check_stop(cmd, 1, 0);
4445                 return -EPERM;
4446         }
4447         atomic_set(&cmd->transport_lun_fe_stop, 1);
4448         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4449
4450         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4451
4452         ret = transport_stop_tasks_for_cmd(cmd);
4453
4454         pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4455                         " %d\n", cmd, cmd->t_task_list_num, ret);
4456         if (!ret) {
4457                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4458                                 cmd->se_tfo->get_task_tag(cmd));
4459                 wait_for_completion(&cmd->transport_lun_stop_comp);
4460                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4461                                 cmd->se_tfo->get_task_tag(cmd));
4462         }
4463         transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
4464
4465         return 0;
4466 }
4467
4468 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4469 {
4470         struct se_cmd *cmd = NULL;
4471         unsigned long lun_flags, cmd_flags;
4472         /*
4473          * Do exception processing and return CHECK_CONDITION status to the
4474          * Initiator Port.
4475          */
4476         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4477         while (!list_empty(&lun->lun_cmd_list)) {
4478                 cmd = list_first_entry(&lun->lun_cmd_list,
4479                        struct se_cmd, se_lun_node);
4480                 list_del(&cmd->se_lun_node);
4481
4482                 atomic_set(&cmd->transport_lun_active, 0);
4483                 /*
4484                  * This will notify iscsi_target_transport.c:
4485                  * transport_cmd_check_stop() that a LUN shutdown is in
4486                  * progress for the iscsi_cmd_t.
4487                  */
4488                 spin_lock(&cmd->t_state_lock);
4489                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4490                         "_lun_stop for  ITT: 0x%08x\n",
4491                         cmd->se_lun->unpacked_lun,
4492                         cmd->se_tfo->get_task_tag(cmd));
4493                 atomic_set(&cmd->transport_lun_stop, 1);
4494                 spin_unlock(&cmd->t_state_lock);
4495
4496                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4497
4498                 if (!cmd->se_lun) {
4499                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4500                                 cmd->se_tfo->get_task_tag(cmd),
4501                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4502                         BUG();
4503                 }
4504                 /*
4505                  * If the Storage engine still owns the iscsi_cmd_t, determine
4506                  * and/or stop its context.
4507                  */
4508                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4509                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4510                         cmd->se_tfo->get_task_tag(cmd));
4511
4512                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4513                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4514                         continue;
4515                 }
4516
4517                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4518                         "_wait_for_tasks(): SUCCESS\n",
4519                         cmd->se_lun->unpacked_lun,
4520                         cmd->se_tfo->get_task_tag(cmd));
4521
4522                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4523                 if (!atomic_read(&cmd->transport_dev_active)) {
4524                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4525                         goto check_cond;
4526                 }
4527                 atomic_set(&cmd->transport_dev_active, 0);
4528                 transport_all_task_dev_remove_state(cmd);
4529                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4530
4531                 transport_free_dev_tasks(cmd);
4532                 /*
4533                  * The Storage engine stopped this struct se_cmd before it was
4534                  * send to the fabric frontend for delivery back to the
4535                  * Initiator Node.  Return this SCSI CDB back with an
4536                  * CHECK_CONDITION status.
4537                  */
4538 check_cond:
4539                 transport_send_check_condition_and_sense(cmd,
4540                                 TCM_NON_EXISTENT_LUN, 0);
4541                 /*
4542                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
4543                  * be released, notify the waiting thread now that LU has
4544                  * finished accessing it.
4545                  */
4546                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4547                 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4548                         pr_debug("SE_LUN[%d] - Detected FE stop for"
4549                                 " struct se_cmd: %p ITT: 0x%08x\n",
4550                                 lun->unpacked_lun,
4551                                 cmd, cmd->se_tfo->get_task_tag(cmd));
4552
4553                         spin_unlock_irqrestore(&cmd->t_state_lock,
4554                                         cmd_flags);
4555                         transport_cmd_check_stop(cmd, 1, 0);
4556                         complete(&cmd->transport_lun_fe_stop_comp);
4557                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4558                         continue;
4559                 }
4560                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4561                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4562
4563                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4564                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4565         }
4566         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4567 }
4568
4569 static int transport_clear_lun_thread(void *p)
4570 {
4571         struct se_lun *lun = (struct se_lun *)p;
4572
4573         __transport_clear_lun_from_sessions(lun);
4574         complete(&lun->lun_shutdown_comp);
4575
4576         return 0;
4577 }
4578
4579 int transport_clear_lun_from_sessions(struct se_lun *lun)
4580 {
4581         struct task_struct *kt;
4582
4583         kt = kthread_run(transport_clear_lun_thread, lun,
4584                         "tcm_cl_%u", lun->unpacked_lun);
4585         if (IS_ERR(kt)) {
4586                 pr_err("Unable to start clear_lun thread\n");
4587                 return PTR_ERR(kt);
4588         }
4589         wait_for_completion(&lun->lun_shutdown_comp);
4590
4591         return 0;
4592 }
4593
4594 /*      transport_generic_wait_for_tasks():
4595  *
4596  *      Called from frontend or passthrough context to wait for storage engine
4597  *      to pause and/or release frontend generated struct se_cmd.
4598  */
4599 static void transport_generic_wait_for_tasks(
4600         struct se_cmd *cmd,
4601         int remove_cmd,
4602         int session_reinstatement)
4603 {
4604         unsigned long flags;
4605
4606         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
4607                 return;
4608
4609         spin_lock_irqsave(&cmd->t_state_lock, flags);
4610         /*
4611          * If we are already stopped due to an external event (ie: LUN shutdown)
4612          * sleep until the connection can have the passed struct se_cmd back.
4613          * The cmd->transport_lun_stopped_sem will be upped by
4614          * transport_clear_lun_from_sessions() once the ConfigFS context caller
4615          * has completed its operation on the struct se_cmd.
4616          */
4617         if (atomic_read(&cmd->transport_lun_stop)) {
4618
4619                 pr_debug("wait_for_tasks: Stopping"
4620                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4621                         "_stop_comp); for ITT: 0x%08x\n",
4622                         cmd->se_tfo->get_task_tag(cmd));
4623                 /*
4624                  * There is a special case for WRITES where a FE exception +
4625                  * LUN shutdown means ConfigFS context is still sleeping on
4626                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4627                  * We go ahead and up transport_lun_stop_comp just to be sure
4628                  * here.
4629                  */
4630                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4631                 complete(&cmd->transport_lun_stop_comp);
4632                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4633                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4634
4635                 transport_all_task_dev_remove_state(cmd);
4636                 /*
4637                  * At this point, the frontend who was the originator of this
4638                  * struct se_cmd, now owns the structure and can be released through
4639                  * normal means below.
4640                  */
4641                 pr_debug("wait_for_tasks: Stopped"
4642                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4643                         "stop_comp); for ITT: 0x%08x\n",
4644                         cmd->se_tfo->get_task_tag(cmd));
4645
4646                 atomic_set(&cmd->transport_lun_stop, 0);
4647         }
4648         if (!atomic_read(&cmd->t_transport_active) ||
4649              atomic_read(&cmd->t_transport_aborted))
4650                 goto remove;
4651
4652         atomic_set(&cmd->t_transport_stop, 1);
4653
4654         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4655                 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4656                 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4657                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
4658                 cmd->deferred_t_state);
4659
4660         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4661
4662         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4663
4664         wait_for_completion(&cmd->t_transport_stop_comp);
4665
4666         spin_lock_irqsave(&cmd->t_state_lock, flags);
4667         atomic_set(&cmd->t_transport_active, 0);
4668         atomic_set(&cmd->t_transport_stop, 0);
4669
4670         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4671                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4672                 cmd->se_tfo->get_task_tag(cmd));
4673 remove:
4674         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4675         if (!remove_cmd)
4676                 return;
4677
4678         transport_generic_free_cmd(cmd, 0, session_reinstatement);
4679 }
4680
4681 static int transport_get_sense_codes(
4682         struct se_cmd *cmd,
4683         u8 *asc,
4684         u8 *ascq)
4685 {
4686         *asc = cmd->scsi_asc;
4687         *ascq = cmd->scsi_ascq;
4688
4689         return 0;
4690 }
4691
4692 static int transport_set_sense_codes(
4693         struct se_cmd *cmd,
4694         u8 asc,
4695         u8 ascq)
4696 {
4697         cmd->scsi_asc = asc;
4698         cmd->scsi_ascq = ascq;
4699
4700         return 0;
4701 }
4702
4703 int transport_send_check_condition_and_sense(
4704         struct se_cmd *cmd,
4705         u8 reason,
4706         int from_transport)
4707 {
4708         unsigned char *buffer = cmd->sense_buffer;
4709         unsigned long flags;
4710         int offset;
4711         u8 asc = 0, ascq = 0;
4712
4713         spin_lock_irqsave(&cmd->t_state_lock, flags);
4714         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4715                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4716                 return 0;
4717         }
4718         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4719         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4720
4721         if (!reason && from_transport)
4722                 goto after_reason;
4723
4724         if (!from_transport)
4725                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4726         /*
4727          * Data Segment and SenseLength of the fabric response PDU.
4728          *
4729          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4730          * from include/scsi/scsi_cmnd.h
4731          */
4732         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4733                                 TRANSPORT_SENSE_BUFFER);
4734         /*
4735          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4736          * SENSE KEY values from include/scsi/scsi.h
4737          */
4738         switch (reason) {
4739         case TCM_NON_EXISTENT_LUN:
4740                 /* CURRENT ERROR */
4741                 buffer[offset] = 0x70;
4742                 /* ILLEGAL REQUEST */
4743                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4744                 /* LOGICAL UNIT NOT SUPPORTED */
4745                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4746                 break;
4747         case TCM_UNSUPPORTED_SCSI_OPCODE:
4748         case TCM_SECTOR_COUNT_TOO_MANY:
4749                 /* CURRENT ERROR */
4750                 buffer[offset] = 0x70;
4751                 /* ILLEGAL REQUEST */
4752                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4753                 /* INVALID COMMAND OPERATION CODE */
4754                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4755                 break;
4756         case TCM_UNKNOWN_MODE_PAGE:
4757                 /* CURRENT ERROR */
4758                 buffer[offset] = 0x70;
4759                 /* ILLEGAL REQUEST */
4760                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4761                 /* INVALID FIELD IN CDB */
4762                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4763                 break;
4764         case TCM_CHECK_CONDITION_ABORT_CMD:
4765                 /* CURRENT ERROR */
4766                 buffer[offset] = 0x70;
4767                 /* ABORTED COMMAND */
4768                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4769                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4770                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4771                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4772                 break;
4773         case TCM_INCORRECT_AMOUNT_OF_DATA:
4774                 /* CURRENT ERROR */
4775                 buffer[offset] = 0x70;
4776                 /* ABORTED COMMAND */
4777                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4778                 /* WRITE ERROR */
4779                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4780                 /* NOT ENOUGH UNSOLICITED DATA */
4781                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4782                 break;
4783         case TCM_INVALID_CDB_FIELD:
4784                 /* CURRENT ERROR */
4785                 buffer[offset] = 0x70;
4786                 /* ABORTED COMMAND */
4787                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4788                 /* INVALID FIELD IN CDB */
4789                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4790                 break;
4791         case TCM_INVALID_PARAMETER_LIST:
4792                 /* CURRENT ERROR */
4793                 buffer[offset] = 0x70;
4794                 /* ABORTED COMMAND */
4795                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4796                 /* INVALID FIELD IN PARAMETER LIST */
4797                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4798                 break;
4799         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4800                 /* CURRENT ERROR */
4801                 buffer[offset] = 0x70;
4802                 /* ABORTED COMMAND */
4803                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4804                 /* WRITE ERROR */
4805                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4806                 /* UNEXPECTED_UNSOLICITED_DATA */
4807                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4808                 break;
4809         case TCM_SERVICE_CRC_ERROR:
4810                 /* CURRENT ERROR */
4811                 buffer[offset] = 0x70;
4812                 /* ABORTED COMMAND */
4813                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4814                 /* PROTOCOL SERVICE CRC ERROR */
4815                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4816                 /* N/A */
4817                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4818                 break;
4819         case TCM_SNACK_REJECTED:
4820                 /* CURRENT ERROR */
4821                 buffer[offset] = 0x70;
4822                 /* ABORTED COMMAND */
4823                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4824                 /* READ ERROR */
4825                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4826                 /* FAILED RETRANSMISSION REQUEST */
4827                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4828                 break;
4829         case TCM_WRITE_PROTECTED:
4830                 /* CURRENT ERROR */
4831                 buffer[offset] = 0x70;
4832                 /* DATA PROTECT */
4833                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4834                 /* WRITE PROTECTED */
4835                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4836                 break;
4837         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4838                 /* CURRENT ERROR */
4839                 buffer[offset] = 0x70;
4840                 /* UNIT ATTENTION */
4841                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4842                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4843                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4844                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4845                 break;
4846         case TCM_CHECK_CONDITION_NOT_READY:
4847                 /* CURRENT ERROR */
4848                 buffer[offset] = 0x70;
4849                 /* Not Ready */
4850                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4851                 transport_get_sense_codes(cmd, &asc, &ascq);
4852                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4853                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4854                 break;
4855         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4856         default:
4857                 /* CURRENT ERROR */
4858                 buffer[offset] = 0x70;
4859                 /* ILLEGAL REQUEST */
4860                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4861                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4862                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4863                 break;
4864         }
4865         /*
4866          * This code uses linux/include/scsi/scsi.h SAM status codes!
4867          */
4868         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4869         /*
4870          * Automatically padded, this value is encoded in the fabric's
4871          * data_length response PDU containing the SCSI defined sense data.
4872          */
4873         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4874
4875 after_reason:
4876         return cmd->se_tfo->queue_status(cmd);
4877 }
4878 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4879
4880 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4881 {
4882         int ret = 0;
4883
4884         if (atomic_read(&cmd->t_transport_aborted) != 0) {
4885                 if (!send_status ||
4886                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4887                         return 1;
4888 #if 0
4889                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4890                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4891                         cmd->t_task_cdb[0],
4892                         cmd->se_tfo->get_task_tag(cmd));
4893 #endif
4894                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4895                 cmd->se_tfo->queue_status(cmd);
4896                 ret = 1;
4897         }
4898         return ret;
4899 }
4900 EXPORT_SYMBOL(transport_check_aborted_status);
4901
4902 void transport_send_task_abort(struct se_cmd *cmd)
4903 {
4904         unsigned long flags;
4905
4906         spin_lock_irqsave(&cmd->t_state_lock, flags);
4907         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4908                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4909                 return;
4910         }
4911         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4912
4913         /*
4914          * If there are still expected incoming fabric WRITEs, we wait
4915          * until until they have completed before sending a TASK_ABORTED
4916          * response.  This response with TASK_ABORTED status will be
4917          * queued back to fabric module by transport_check_aborted_status().
4918          */
4919         if (cmd->data_direction == DMA_TO_DEVICE) {
4920                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4921                         atomic_inc(&cmd->t_transport_aborted);
4922                         smp_mb__after_atomic_inc();
4923                         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4924                         transport_new_cmd_failure(cmd);
4925                         return;
4926                 }
4927         }
4928         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4929 #if 0
4930         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4931                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4932                 cmd->se_tfo->get_task_tag(cmd));
4933 #endif
4934         cmd->se_tfo->queue_status(cmd);
4935 }
4936
4937 /*      transport_generic_do_tmr():
4938  *
4939  *
4940  */
4941 int transport_generic_do_tmr(struct se_cmd *cmd)
4942 {
4943         struct se_device *dev = cmd->se_dev;
4944         struct se_tmr_req *tmr = cmd->se_tmr_req;
4945         int ret;
4946
4947         switch (tmr->function) {
4948         case TMR_ABORT_TASK:
4949                 tmr->response = TMR_FUNCTION_REJECTED;
4950                 break;
4951         case TMR_ABORT_TASK_SET:
4952         case TMR_CLEAR_ACA:
4953         case TMR_CLEAR_TASK_SET:
4954                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4955                 break;
4956         case TMR_LUN_RESET:
4957                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4958                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4959                                          TMR_FUNCTION_REJECTED;
4960                 break;
4961         case TMR_TARGET_WARM_RESET:
4962                 tmr->response = TMR_FUNCTION_REJECTED;
4963                 break;
4964         case TMR_TARGET_COLD_RESET:
4965                 tmr->response = TMR_FUNCTION_REJECTED;
4966                 break;
4967         default:
4968                 pr_err("Uknown TMR function: 0x%02x.\n",
4969                                 tmr->function);
4970                 tmr->response = TMR_FUNCTION_REJECTED;
4971                 break;
4972         }
4973
4974         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4975         cmd->se_tfo->queue_tm_rsp(cmd);
4976
4977         transport_cmd_check_stop(cmd, 2, 0);
4978         return 0;
4979 }
4980
4981 /*
4982  *      Called with spin_lock_irq(&dev->execute_task_lock); held
4983  *
4984  */
4985 static struct se_task *
4986 transport_get_task_from_state_list(struct se_device *dev)
4987 {
4988         struct se_task *task;
4989
4990         if (list_empty(&dev->state_task_list))
4991                 return NULL;
4992
4993         list_for_each_entry(task, &dev->state_task_list, t_state_list)
4994                 break;
4995
4996         list_del(&task->t_state_list);
4997         atomic_set(&task->task_state_active, 0);
4998
4999         return task;
5000 }
5001
5002 static void transport_processing_shutdown(struct se_device *dev)
5003 {
5004         struct se_cmd *cmd;
5005         struct se_task *task;
5006         unsigned long flags;
5007         /*
5008          * Empty the struct se_device's struct se_task state list.
5009          */
5010         spin_lock_irqsave(&dev->execute_task_lock, flags);
5011         while ((task = transport_get_task_from_state_list(dev))) {
5012                 if (!task->task_se_cmd) {
5013                         pr_err("task->task_se_cmd is NULL!\n");
5014                         continue;
5015                 }
5016                 cmd = task->task_se_cmd;
5017
5018                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5019
5020                 spin_lock_irqsave(&cmd->t_state_lock, flags);
5021
5022                 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
5023                         " i_state: %d, t_state/def_t_state:"
5024                         " %d/%d cdb: 0x%02x\n", cmd, task,
5025                         cmd->se_tfo->get_task_tag(cmd),
5026                         cmd->se_tfo->get_cmd_state(cmd),
5027                         cmd->t_state, cmd->deferred_t_state,
5028                         cmd->t_task_cdb[0]);
5029                 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
5030                         " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5031                         " t_transport_stop: %d t_transport_sent: %d\n",
5032                         cmd->se_tfo->get_task_tag(cmd),
5033                         cmd->t_task_list_num,
5034                         atomic_read(&cmd->t_task_cdbs_left),
5035                         atomic_read(&cmd->t_task_cdbs_sent),
5036                         atomic_read(&cmd->t_transport_active),
5037                         atomic_read(&cmd->t_transport_stop),
5038                         atomic_read(&cmd->t_transport_sent));
5039
5040                 if (atomic_read(&task->task_active)) {
5041                         atomic_set(&task->task_stop, 1);
5042                         spin_unlock_irqrestore(
5043                                 &cmd->t_state_lock, flags);
5044
5045                         pr_debug("Waiting for task: %p to shutdown for dev:"
5046                                 " %p\n", task, dev);
5047                         wait_for_completion(&task->task_stop_comp);
5048                         pr_debug("Completed task: %p shutdown for dev: %p\n",
5049                                 task, dev);
5050
5051                         spin_lock_irqsave(&cmd->t_state_lock, flags);
5052                         atomic_dec(&cmd->t_task_cdbs_left);
5053
5054                         atomic_set(&task->task_active, 0);
5055                         atomic_set(&task->task_stop, 0);
5056                 } else {
5057                         if (atomic_read(&task->task_execute_queue) != 0)
5058                                 transport_remove_task_from_execute_queue(task, dev);
5059                 }
5060                 __transport_stop_task_timer(task, &flags);
5061
5062                 if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
5063                         spin_unlock_irqrestore(
5064                                         &cmd->t_state_lock, flags);
5065
5066                         pr_debug("Skipping task: %p, dev: %p for"
5067                                 " t_task_cdbs_ex_left: %d\n", task, dev,
5068                                 atomic_read(&cmd->t_task_cdbs_ex_left));
5069
5070                         spin_lock_irqsave(&dev->execute_task_lock, flags);
5071                         continue;
5072                 }
5073
5074                 if (atomic_read(&cmd->t_transport_active)) {
5075                         pr_debug("got t_transport_active = 1 for task: %p, dev:"
5076                                         " %p\n", task, dev);
5077
5078                         if (atomic_read(&cmd->t_fe_count)) {
5079                                 spin_unlock_irqrestore(
5080                                         &cmd->t_state_lock, flags);
5081                                 transport_send_check_condition_and_sense(
5082                                         cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5083                                         0);
5084                                 transport_remove_cmd_from_queue(cmd,
5085                                         &cmd->se_dev->dev_queue_obj);
5086
5087                                 transport_lun_remove_cmd(cmd);
5088                                 transport_cmd_check_stop(cmd, 1, 0);
5089                         } else {
5090                                 spin_unlock_irqrestore(
5091                                         &cmd->t_state_lock, flags);
5092
5093                                 transport_remove_cmd_from_queue(cmd,
5094                                         &cmd->se_dev->dev_queue_obj);
5095
5096                                 transport_lun_remove_cmd(cmd);
5097
5098                                 if (transport_cmd_check_stop(cmd, 1, 0))
5099                                         transport_generic_remove(cmd, 0);
5100                         }
5101
5102                         spin_lock_irqsave(&dev->execute_task_lock, flags);
5103                         continue;
5104                 }
5105                 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
5106                                 task, dev);
5107
5108                 if (atomic_read(&cmd->t_fe_count)) {
5109                         spin_unlock_irqrestore(
5110                                 &cmd->t_state_lock, flags);
5111                         transport_send_check_condition_and_sense(cmd,
5112                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5113                         transport_remove_cmd_from_queue(cmd,
5114                                 &cmd->se_dev->dev_queue_obj);
5115
5116                         transport_lun_remove_cmd(cmd);
5117                         transport_cmd_check_stop(cmd, 1, 0);
5118                 } else {
5119                         spin_unlock_irqrestore(
5120                                 &cmd->t_state_lock, flags);
5121
5122                         transport_remove_cmd_from_queue(cmd,
5123                                 &cmd->se_dev->dev_queue_obj);
5124                         transport_lun_remove_cmd(cmd);
5125
5126                         if (transport_cmd_check_stop(cmd, 1, 0))
5127                                 transport_generic_remove(cmd, 0);
5128                 }
5129
5130                 spin_lock_irqsave(&dev->execute_task_lock, flags);
5131         }
5132         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5133         /*
5134          * Empty the struct se_device's struct se_cmd list.
5135          */
5136         while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
5137
5138                 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5139                                 cmd, cmd->t_state);
5140
5141                 if (atomic_read(&cmd->t_fe_count)) {
5142                         transport_send_check_condition_and_sense(cmd,
5143                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5144
5145                         transport_lun_remove_cmd(cmd);
5146                         transport_cmd_check_stop(cmd, 1, 0);
5147                 } else {
5148                         transport_lun_remove_cmd(cmd);
5149                         if (transport_cmd_check_stop(cmd, 1, 0))
5150                                 transport_generic_remove(cmd, 0);
5151                 }
5152         }
5153 }
5154
5155 /*      transport_processing_thread():
5156  *
5157  *
5158  */
5159 static int transport_processing_thread(void *param)
5160 {
5161         int ret;
5162         struct se_cmd *cmd;
5163         struct se_device *dev = (struct se_device *) param;
5164
5165         set_user_nice(current, -20);
5166
5167         while (!kthread_should_stop()) {
5168                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5169                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
5170                                 kthread_should_stop());
5171                 if (ret < 0)
5172                         goto out;
5173
5174                 spin_lock_irq(&dev->dev_status_lock);
5175                 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5176                         spin_unlock_irq(&dev->dev_status_lock);
5177                         transport_processing_shutdown(dev);
5178                         continue;
5179                 }
5180                 spin_unlock_irq(&dev->dev_status_lock);
5181
5182 get_cmd:
5183                 __transport_execute_tasks(dev);
5184
5185                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5186                 if (!cmd)
5187                         continue;
5188
5189                 switch (cmd->t_state) {
5190                 case TRANSPORT_NEW_CMD:
5191                         BUG();
5192                         break;
5193                 case TRANSPORT_NEW_CMD_MAP:
5194                         if (!cmd->se_tfo->new_cmd_map) {
5195                                 pr_err("cmd->se_tfo->new_cmd_map is"
5196                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
5197                                 BUG();
5198                         }
5199                         ret = cmd->se_tfo->new_cmd_map(cmd);
5200                         if (ret < 0) {
5201                                 cmd->transport_error_status = ret;
5202                                 transport_generic_request_failure(cmd, NULL,
5203                                                 0, (cmd->data_direction !=
5204                                                     DMA_TO_DEVICE));
5205                                 break;
5206                         }
5207                         ret = transport_generic_new_cmd(cmd);
5208                         if (ret == -EAGAIN)
5209                                 break;
5210                         else if (ret < 0) {
5211                                 cmd->transport_error_status = ret;
5212                                 transport_generic_request_failure(cmd, NULL,
5213                                         0, (cmd->data_direction !=
5214                                          DMA_TO_DEVICE));
5215                         }
5216                         break;
5217                 case TRANSPORT_PROCESS_WRITE:
5218                         transport_generic_process_write(cmd);
5219                         break;
5220                 case TRANSPORT_COMPLETE_OK:
5221                         transport_stop_all_task_timers(cmd);
5222                         transport_generic_complete_ok(cmd);
5223                         break;
5224                 case TRANSPORT_REMOVE:
5225                         transport_generic_remove(cmd, 0);
5226                         break;
5227                 case TRANSPORT_FREE_CMD_INTR:
5228                         transport_generic_free_cmd(cmd, 0, 0);
5229                         break;
5230                 case TRANSPORT_PROCESS_TMR:
5231                         transport_generic_do_tmr(cmd);
5232                         break;
5233                 case TRANSPORT_COMPLETE_FAILURE:
5234                         transport_generic_request_failure(cmd, NULL, 1, 1);
5235                         break;
5236                 case TRANSPORT_COMPLETE_TIMEOUT:
5237                         transport_stop_all_task_timers(cmd);
5238                         transport_generic_request_timeout(cmd);
5239                         break;
5240                 case TRANSPORT_COMPLETE_QF_WP:
5241                         transport_generic_write_pending(cmd);
5242                         break;
5243                 default:
5244                         pr_err("Unknown t_state: %d deferred_t_state:"
5245                                 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5246                                 " %u\n", cmd->t_state, cmd->deferred_t_state,
5247                                 cmd->se_tfo->get_task_tag(cmd),
5248                                 cmd->se_tfo->get_cmd_state(cmd),
5249                                 cmd->se_lun->unpacked_lun);
5250                         BUG();
5251                 }
5252
5253                 goto get_cmd;
5254         }
5255
5256 out:
5257         transport_release_all_cmds(dev);
5258         dev->process_thread = NULL;
5259         return 0;
5260 }