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target: Fix WRITE_SAME_[16,32] number of blocks=0 case
[deliverable/linux.git] / drivers / target / target_core_transport.c
1 /*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
29 #include <linux/version.h>
30 #include <linux/net.h>
31 #include <linux/delay.h>
32 #include <linux/string.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/blkdev.h>
36 #include <linux/spinlock.h>
37 #include <linux/kthread.h>
38 #include <linux/in.h>
39 #include <linux/cdrom.h>
40 #include <asm/unaligned.h>
41 #include <net/sock.h>
42 #include <net/tcp.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_cmnd.h>
45 #include <scsi/scsi_tcq.h>
46
47 #include <target/target_core_base.h>
48 #include <target/target_core_device.h>
49 #include <target/target_core_tmr.h>
50 #include <target/target_core_tpg.h>
51 #include <target/target_core_transport.h>
52 #include <target/target_core_fabric_ops.h>
53 #include <target/target_core_configfs.h>
54
55 #include "target_core_alua.h"
56 #include "target_core_hba.h"
57 #include "target_core_pr.h"
58 #include "target_core_scdb.h"
59 #include "target_core_ua.h"
60
61 /* #define DEBUG_CDB_HANDLER */
62 #ifdef DEBUG_CDB_HANDLER
63 #define DEBUG_CDB_H(x...) printk(KERN_INFO x)
64 #else
65 #define DEBUG_CDB_H(x...)
66 #endif
67
68 /* #define DEBUG_CMD_MAP */
69 #ifdef DEBUG_CMD_MAP
70 #define DEBUG_CMD_M(x...) printk(KERN_INFO x)
71 #else
72 #define DEBUG_CMD_M(x...)
73 #endif
74
75 /* #define DEBUG_MEM_ALLOC */
76 #ifdef DEBUG_MEM_ALLOC
77 #define DEBUG_MEM(x...) printk(KERN_INFO x)
78 #else
79 #define DEBUG_MEM(x...)
80 #endif
81
82 /* #define DEBUG_MEM2_ALLOC */
83 #ifdef DEBUG_MEM2_ALLOC
84 #define DEBUG_MEM2(x...) printk(KERN_INFO x)
85 #else
86 #define DEBUG_MEM2(x...)
87 #endif
88
89 /* #define DEBUG_SG_CALC */
90 #ifdef DEBUG_SG_CALC
91 #define DEBUG_SC(x...) printk(KERN_INFO x)
92 #else
93 #define DEBUG_SC(x...)
94 #endif
95
96 /* #define DEBUG_SE_OBJ */
97 #ifdef DEBUG_SE_OBJ
98 #define DEBUG_SO(x...) printk(KERN_INFO x)
99 #else
100 #define DEBUG_SO(x...)
101 #endif
102
103 /* #define DEBUG_CMD_VOL */
104 #ifdef DEBUG_CMD_VOL
105 #define DEBUG_VOL(x...) printk(KERN_INFO x)
106 #else
107 #define DEBUG_VOL(x...)
108 #endif
109
110 /* #define DEBUG_CMD_STOP */
111 #ifdef DEBUG_CMD_STOP
112 #define DEBUG_CS(x...) printk(KERN_INFO x)
113 #else
114 #define DEBUG_CS(x...)
115 #endif
116
117 /* #define DEBUG_PASSTHROUGH */
118 #ifdef DEBUG_PASSTHROUGH
119 #define DEBUG_PT(x...) printk(KERN_INFO x)
120 #else
121 #define DEBUG_PT(x...)
122 #endif
123
124 /* #define DEBUG_TASK_STOP */
125 #ifdef DEBUG_TASK_STOP
126 #define DEBUG_TS(x...) printk(KERN_INFO x)
127 #else
128 #define DEBUG_TS(x...)
129 #endif
130
131 /* #define DEBUG_TRANSPORT_STOP */
132 #ifdef DEBUG_TRANSPORT_STOP
133 #define DEBUG_TRANSPORT_S(x...) printk(KERN_INFO x)
134 #else
135 #define DEBUG_TRANSPORT_S(x...)
136 #endif
137
138 /* #define DEBUG_TASK_FAILURE */
139 #ifdef DEBUG_TASK_FAILURE
140 #define DEBUG_TF(x...) printk(KERN_INFO x)
141 #else
142 #define DEBUG_TF(x...)
143 #endif
144
145 /* #define DEBUG_DEV_OFFLINE */
146 #ifdef DEBUG_DEV_OFFLINE
147 #define DEBUG_DO(x...) printk(KERN_INFO x)
148 #else
149 #define DEBUG_DO(x...)
150 #endif
151
152 /* #define DEBUG_TASK_STATE */
153 #ifdef DEBUG_TASK_STATE
154 #define DEBUG_TSTATE(x...) printk(KERN_INFO x)
155 #else
156 #define DEBUG_TSTATE(x...)
157 #endif
158
159 /* #define DEBUG_STATUS_THR */
160 #ifdef DEBUG_STATUS_THR
161 #define DEBUG_ST(x...) printk(KERN_INFO x)
162 #else
163 #define DEBUG_ST(x...)
164 #endif
165
166 /* #define DEBUG_TASK_TIMEOUT */
167 #ifdef DEBUG_TASK_TIMEOUT
168 #define DEBUG_TT(x...) printk(KERN_INFO x)
169 #else
170 #define DEBUG_TT(x...)
171 #endif
172
173 /* #define DEBUG_GENERIC_REQUEST_FAILURE */
174 #ifdef DEBUG_GENERIC_REQUEST_FAILURE
175 #define DEBUG_GRF(x...) printk(KERN_INFO x)
176 #else
177 #define DEBUG_GRF(x...)
178 #endif
179
180 /* #define DEBUG_SAM_TASK_ATTRS */
181 #ifdef DEBUG_SAM_TASK_ATTRS
182 #define DEBUG_STA(x...) printk(KERN_INFO x)
183 #else
184 #define DEBUG_STA(x...)
185 #endif
186
187 static int sub_api_initialized;
188
189 static struct kmem_cache *se_cmd_cache;
190 static struct kmem_cache *se_sess_cache;
191 struct kmem_cache *se_tmr_req_cache;
192 struct kmem_cache *se_ua_cache;
193 struct kmem_cache *se_mem_cache;
194 struct kmem_cache *t10_pr_reg_cache;
195 struct kmem_cache *t10_alua_lu_gp_cache;
196 struct kmem_cache *t10_alua_lu_gp_mem_cache;
197 struct kmem_cache *t10_alua_tg_pt_gp_cache;
198 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
199
200 /* Used for transport_dev_get_map_*() */
201 typedef int (*map_func_t)(struct se_task *, u32);
202
203 static int transport_generic_write_pending(struct se_cmd *);
204 static int transport_processing_thread(void *param);
205 static int __transport_execute_tasks(struct se_device *dev);
206 static void transport_complete_task_attr(struct se_cmd *cmd);
207 static void transport_direct_request_timeout(struct se_cmd *cmd);
208 static void transport_free_dev_tasks(struct se_cmd *cmd);
209 static u32 transport_generic_get_cdb_count(struct se_cmd *cmd,
210 unsigned long long starting_lba, u32 sectors,
211 enum dma_data_direction data_direction,
212 struct list_head *mem_list, int set_counts);
213 static int transport_generic_get_mem(struct se_cmd *cmd, u32 length,
214 u32 dma_size);
215 static int transport_generic_remove(struct se_cmd *cmd,
216 int release_to_pool, int session_reinstatement);
217 static int transport_get_sectors(struct se_cmd *cmd);
218 static int transport_map_sg_to_mem(struct se_cmd *cmd,
219 struct list_head *se_mem_list, struct scatterlist *sgl,
220 u32 *se_mem_cnt);
221 static void transport_memcpy_se_mem_read_contig(struct se_cmd *cmd,
222 unsigned char *dst, struct list_head *se_mem_list);
223 static void transport_release_fe_cmd(struct se_cmd *cmd);
224 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
225 struct se_queue_obj *qobj);
226 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
227 static void transport_stop_all_task_timers(struct se_cmd *cmd);
228
229 int init_se_kmem_caches(void)
230 {
231 se_cmd_cache = kmem_cache_create("se_cmd_cache",
232 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
233 if (!(se_cmd_cache)) {
234 printk(KERN_ERR "kmem_cache_create for struct se_cmd failed\n");
235 goto out;
236 }
237 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
238 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
239 0, NULL);
240 if (!(se_tmr_req_cache)) {
241 printk(KERN_ERR "kmem_cache_create() for struct se_tmr_req"
242 " failed\n");
243 goto out;
244 }
245 se_sess_cache = kmem_cache_create("se_sess_cache",
246 sizeof(struct se_session), __alignof__(struct se_session),
247 0, NULL);
248 if (!(se_sess_cache)) {
249 printk(KERN_ERR "kmem_cache_create() for struct se_session"
250 " failed\n");
251 goto out;
252 }
253 se_ua_cache = kmem_cache_create("se_ua_cache",
254 sizeof(struct se_ua), __alignof__(struct se_ua),
255 0, NULL);
256 if (!(se_ua_cache)) {
257 printk(KERN_ERR "kmem_cache_create() for struct se_ua failed\n");
258 goto out;
259 }
260 se_mem_cache = kmem_cache_create("se_mem_cache",
261 sizeof(struct se_mem), __alignof__(struct se_mem), 0, NULL);
262 if (!(se_mem_cache)) {
263 printk(KERN_ERR "kmem_cache_create() for struct se_mem failed\n");
264 goto out;
265 }
266 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
267 sizeof(struct t10_pr_registration),
268 __alignof__(struct t10_pr_registration), 0, NULL);
269 if (!(t10_pr_reg_cache)) {
270 printk(KERN_ERR "kmem_cache_create() for struct t10_pr_registration"
271 " failed\n");
272 goto out;
273 }
274 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
275 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
276 0, NULL);
277 if (!(t10_alua_lu_gp_cache)) {
278 printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_cache"
279 " failed\n");
280 goto out;
281 }
282 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
283 sizeof(struct t10_alua_lu_gp_member),
284 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
285 if (!(t10_alua_lu_gp_mem_cache)) {
286 printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_mem_"
287 "cache failed\n");
288 goto out;
289 }
290 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
291 sizeof(struct t10_alua_tg_pt_gp),
292 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
293 if (!(t10_alua_tg_pt_gp_cache)) {
294 printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
295 "cache failed\n");
296 goto out;
297 }
298 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
299 "t10_alua_tg_pt_gp_mem_cache",
300 sizeof(struct t10_alua_tg_pt_gp_member),
301 __alignof__(struct t10_alua_tg_pt_gp_member),
302 0, NULL);
303 if (!(t10_alua_tg_pt_gp_mem_cache)) {
304 printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_"
305 "mem_t failed\n");
306 goto out;
307 }
308
309 return 0;
310 out:
311 if (se_cmd_cache)
312 kmem_cache_destroy(se_cmd_cache);
313 if (se_tmr_req_cache)
314 kmem_cache_destroy(se_tmr_req_cache);
315 if (se_sess_cache)
316 kmem_cache_destroy(se_sess_cache);
317 if (se_ua_cache)
318 kmem_cache_destroy(se_ua_cache);
319 if (se_mem_cache)
320 kmem_cache_destroy(se_mem_cache);
321 if (t10_pr_reg_cache)
322 kmem_cache_destroy(t10_pr_reg_cache);
323 if (t10_alua_lu_gp_cache)
324 kmem_cache_destroy(t10_alua_lu_gp_cache);
325 if (t10_alua_lu_gp_mem_cache)
326 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
327 if (t10_alua_tg_pt_gp_cache)
328 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
329 if (t10_alua_tg_pt_gp_mem_cache)
330 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
331 return -ENOMEM;
332 }
333
334 void release_se_kmem_caches(void)
335 {
336 kmem_cache_destroy(se_cmd_cache);
337 kmem_cache_destroy(se_tmr_req_cache);
338 kmem_cache_destroy(se_sess_cache);
339 kmem_cache_destroy(se_ua_cache);
340 kmem_cache_destroy(se_mem_cache);
341 kmem_cache_destroy(t10_pr_reg_cache);
342 kmem_cache_destroy(t10_alua_lu_gp_cache);
343 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
344 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
345 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
346 }
347
348 /* This code ensures unique mib indexes are handed out. */
349 static DEFINE_SPINLOCK(scsi_mib_index_lock);
350 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
351
352 /*
353 * Allocate a new row index for the entry type specified
354 */
355 u32 scsi_get_new_index(scsi_index_t type)
356 {
357 u32 new_index;
358
359 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
360
361 spin_lock(&scsi_mib_index_lock);
362 new_index = ++scsi_mib_index[type];
363 spin_unlock(&scsi_mib_index_lock);
364
365 return new_index;
366 }
367
368 void transport_init_queue_obj(struct se_queue_obj *qobj)
369 {
370 atomic_set(&qobj->queue_cnt, 0);
371 INIT_LIST_HEAD(&qobj->qobj_list);
372 init_waitqueue_head(&qobj->thread_wq);
373 spin_lock_init(&qobj->cmd_queue_lock);
374 }
375 EXPORT_SYMBOL(transport_init_queue_obj);
376
377 static int transport_subsystem_reqmods(void)
378 {
379 int ret;
380
381 ret = request_module("target_core_iblock");
382 if (ret != 0)
383 printk(KERN_ERR "Unable to load target_core_iblock\n");
384
385 ret = request_module("target_core_file");
386 if (ret != 0)
387 printk(KERN_ERR "Unable to load target_core_file\n");
388
389 ret = request_module("target_core_pscsi");
390 if (ret != 0)
391 printk(KERN_ERR "Unable to load target_core_pscsi\n");
392
393 ret = request_module("target_core_stgt");
394 if (ret != 0)
395 printk(KERN_ERR "Unable to load target_core_stgt\n");
396
397 return 0;
398 }
399
400 int transport_subsystem_check_init(void)
401 {
402 int ret;
403
404 if (sub_api_initialized)
405 return 0;
406 /*
407 * Request the loading of known TCM subsystem plugins..
408 */
409 ret = transport_subsystem_reqmods();
410 if (ret < 0)
411 return ret;
412
413 sub_api_initialized = 1;
414 return 0;
415 }
416
417 struct se_session *transport_init_session(void)
418 {
419 struct se_session *se_sess;
420
421 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
422 if (!(se_sess)) {
423 printk(KERN_ERR "Unable to allocate struct se_session from"
424 " se_sess_cache\n");
425 return ERR_PTR(-ENOMEM);
426 }
427 INIT_LIST_HEAD(&se_sess->sess_list);
428 INIT_LIST_HEAD(&se_sess->sess_acl_list);
429
430 return se_sess;
431 }
432 EXPORT_SYMBOL(transport_init_session);
433
434 /*
435 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
436 */
437 void __transport_register_session(
438 struct se_portal_group *se_tpg,
439 struct se_node_acl *se_nacl,
440 struct se_session *se_sess,
441 void *fabric_sess_ptr)
442 {
443 unsigned char buf[PR_REG_ISID_LEN];
444
445 se_sess->se_tpg = se_tpg;
446 se_sess->fabric_sess_ptr = fabric_sess_ptr;
447 /*
448 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
449 *
450 * Only set for struct se_session's that will actually be moving I/O.
451 * eg: *NOT* discovery sessions.
452 */
453 if (se_nacl) {
454 /*
455 * If the fabric module supports an ISID based TransportID,
456 * save this value in binary from the fabric I_T Nexus now.
457 */
458 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
459 memset(&buf[0], 0, PR_REG_ISID_LEN);
460 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
461 &buf[0], PR_REG_ISID_LEN);
462 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
463 }
464 spin_lock_irq(&se_nacl->nacl_sess_lock);
465 /*
466 * The se_nacl->nacl_sess pointer will be set to the
467 * last active I_T Nexus for each struct se_node_acl.
468 */
469 se_nacl->nacl_sess = se_sess;
470
471 list_add_tail(&se_sess->sess_acl_list,
472 &se_nacl->acl_sess_list);
473 spin_unlock_irq(&se_nacl->nacl_sess_lock);
474 }
475 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
476
477 printk(KERN_INFO "TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
478 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
479 }
480 EXPORT_SYMBOL(__transport_register_session);
481
482 void transport_register_session(
483 struct se_portal_group *se_tpg,
484 struct se_node_acl *se_nacl,
485 struct se_session *se_sess,
486 void *fabric_sess_ptr)
487 {
488 spin_lock_bh(&se_tpg->session_lock);
489 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
490 spin_unlock_bh(&se_tpg->session_lock);
491 }
492 EXPORT_SYMBOL(transport_register_session);
493
494 void transport_deregister_session_configfs(struct se_session *se_sess)
495 {
496 struct se_node_acl *se_nacl;
497 unsigned long flags;
498 /*
499 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
500 */
501 se_nacl = se_sess->se_node_acl;
502 if ((se_nacl)) {
503 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
504 list_del(&se_sess->sess_acl_list);
505 /*
506 * If the session list is empty, then clear the pointer.
507 * Otherwise, set the struct se_session pointer from the tail
508 * element of the per struct se_node_acl active session list.
509 */
510 if (list_empty(&se_nacl->acl_sess_list))
511 se_nacl->nacl_sess = NULL;
512 else {
513 se_nacl->nacl_sess = container_of(
514 se_nacl->acl_sess_list.prev,
515 struct se_session, sess_acl_list);
516 }
517 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
518 }
519 }
520 EXPORT_SYMBOL(transport_deregister_session_configfs);
521
522 void transport_free_session(struct se_session *se_sess)
523 {
524 kmem_cache_free(se_sess_cache, se_sess);
525 }
526 EXPORT_SYMBOL(transport_free_session);
527
528 void transport_deregister_session(struct se_session *se_sess)
529 {
530 struct se_portal_group *se_tpg = se_sess->se_tpg;
531 struct se_node_acl *se_nacl;
532
533 if (!(se_tpg)) {
534 transport_free_session(se_sess);
535 return;
536 }
537
538 spin_lock_bh(&se_tpg->session_lock);
539 list_del(&se_sess->sess_list);
540 se_sess->se_tpg = NULL;
541 se_sess->fabric_sess_ptr = NULL;
542 spin_unlock_bh(&se_tpg->session_lock);
543
544 /*
545 * Determine if we need to do extra work for this initiator node's
546 * struct se_node_acl if it had been previously dynamically generated.
547 */
548 se_nacl = se_sess->se_node_acl;
549 if ((se_nacl)) {
550 spin_lock_bh(&se_tpg->acl_node_lock);
551 if (se_nacl->dynamic_node_acl) {
552 if (!(se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
553 se_tpg))) {
554 list_del(&se_nacl->acl_list);
555 se_tpg->num_node_acls--;
556 spin_unlock_bh(&se_tpg->acl_node_lock);
557
558 core_tpg_wait_for_nacl_pr_ref(se_nacl);
559 core_free_device_list_for_node(se_nacl, se_tpg);
560 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
561 se_nacl);
562 spin_lock_bh(&se_tpg->acl_node_lock);
563 }
564 }
565 spin_unlock_bh(&se_tpg->acl_node_lock);
566 }
567
568 transport_free_session(se_sess);
569
570 printk(KERN_INFO "TARGET_CORE[%s]: Deregistered fabric_sess\n",
571 se_tpg->se_tpg_tfo->get_fabric_name());
572 }
573 EXPORT_SYMBOL(transport_deregister_session);
574
575 /*
576 * Called with cmd->t_task.t_state_lock held.
577 */
578 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
579 {
580 struct se_device *dev;
581 struct se_task *task;
582 unsigned long flags;
583
584 list_for_each_entry(task, &cmd->t_task.t_task_list, t_list) {
585 dev = task->se_dev;
586 if (!(dev))
587 continue;
588
589 if (atomic_read(&task->task_active))
590 continue;
591
592 if (!(atomic_read(&task->task_state_active)))
593 continue;
594
595 spin_lock_irqsave(&dev->execute_task_lock, flags);
596 list_del(&task->t_state_list);
597 DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n",
598 cmd->se_tfo->tfo_get_task_tag(cmd), dev, task);
599 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
600
601 atomic_set(&task->task_state_active, 0);
602 atomic_dec(&cmd->t_task.t_task_cdbs_ex_left);
603 }
604 }
605
606 /* transport_cmd_check_stop():
607 *
608 * 'transport_off = 1' determines if t_transport_active should be cleared.
609 * 'transport_off = 2' determines if task_dev_state should be removed.
610 *
611 * A non-zero u8 t_state sets cmd->t_state.
612 * Returns 1 when command is stopped, else 0.
613 */
614 static int transport_cmd_check_stop(
615 struct se_cmd *cmd,
616 int transport_off,
617 u8 t_state)
618 {
619 unsigned long flags;
620
621 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
622 /*
623 * Determine if IOCTL context caller in requesting the stopping of this
624 * command for LUN shutdown purposes.
625 */
626 if (atomic_read(&cmd->t_task.transport_lun_stop)) {
627 DEBUG_CS("%s:%d atomic_read(&cmd->t_task.transport_lun_stop)"
628 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
629 cmd->se_tfo->get_task_tag(cmd));
630
631 cmd->deferred_t_state = cmd->t_state;
632 cmd->t_state = TRANSPORT_DEFERRED_CMD;
633 atomic_set(&cmd->t_task.t_transport_active, 0);
634 if (transport_off == 2)
635 transport_all_task_dev_remove_state(cmd);
636 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
637
638 complete(&cmd->t_task.transport_lun_stop_comp);
639 return 1;
640 }
641 /*
642 * Determine if frontend context caller is requesting the stopping of
643 * this command for frontend exceptions.
644 */
645 if (atomic_read(&cmd->t_task.t_transport_stop)) {
646 DEBUG_CS("%s:%d atomic_read(&cmd->t_task.t_transport_stop) =="
647 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
648 cmd->se_tfo->get_task_tag(cmd));
649
650 cmd->deferred_t_state = cmd->t_state;
651 cmd->t_state = TRANSPORT_DEFERRED_CMD;
652 if (transport_off == 2)
653 transport_all_task_dev_remove_state(cmd);
654
655 /*
656 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
657 * to FE.
658 */
659 if (transport_off == 2)
660 cmd->se_lun = NULL;
661 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
662
663 complete(&cmd->t_task.t_transport_stop_comp);
664 return 1;
665 }
666 if (transport_off) {
667 atomic_set(&cmd->t_task.t_transport_active, 0);
668 if (transport_off == 2) {
669 transport_all_task_dev_remove_state(cmd);
670 /*
671 * Clear struct se_cmd->se_lun before the transport_off == 2
672 * handoff to fabric module.
673 */
674 cmd->se_lun = NULL;
675 /*
676 * Some fabric modules like tcm_loop can release
677 * their internally allocated I/O reference now and
678 * struct se_cmd now.
679 */
680 if (cmd->se_tfo->check_stop_free != NULL) {
681 spin_unlock_irqrestore(
682 &cmd->t_task.t_state_lock, flags);
683
684 cmd->se_tfo->check_stop_free(cmd);
685 return 1;
686 }
687 }
688 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
689
690 return 0;
691 } else if (t_state)
692 cmd->t_state = t_state;
693 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
694
695 return 0;
696 }
697
698 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
699 {
700 return transport_cmd_check_stop(cmd, 2, 0);
701 }
702
703 static void transport_lun_remove_cmd(struct se_cmd *cmd)
704 {
705 struct se_lun *lun = cmd->se_lun;
706 unsigned long flags;
707
708 if (!lun)
709 return;
710
711 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
712 if (!(atomic_read(&cmd->t_task.transport_dev_active))) {
713 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
714 goto check_lun;
715 }
716 atomic_set(&cmd->t_task.transport_dev_active, 0);
717 transport_all_task_dev_remove_state(cmd);
718 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
719
720
721 check_lun:
722 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
723 if (atomic_read(&cmd->t_task.transport_lun_active)) {
724 list_del(&cmd->se_lun_node);
725 atomic_set(&cmd->t_task.transport_lun_active, 0);
726 #if 0
727 printk(KERN_INFO "Removed ITT: 0x%08x from LUN LIST[%d]\n"
728 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
729 #endif
730 }
731 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
732 }
733
734 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
735 {
736 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
737 transport_lun_remove_cmd(cmd);
738
739 if (transport_cmd_check_stop_to_fabric(cmd))
740 return;
741 if (remove)
742 transport_generic_remove(cmd, 0, 0);
743 }
744
745 void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
746 {
747 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
748
749 if (transport_cmd_check_stop_to_fabric(cmd))
750 return;
751
752 transport_generic_remove(cmd, 0, 0);
753 }
754
755 static void transport_add_cmd_to_queue(
756 struct se_cmd *cmd,
757 int t_state)
758 {
759 struct se_device *dev = cmd->se_dev;
760 struct se_queue_obj *qobj = &dev->dev_queue_obj;
761 unsigned long flags;
762
763 INIT_LIST_HEAD(&cmd->se_queue_node);
764
765 if (t_state) {
766 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
767 cmd->t_state = t_state;
768 atomic_set(&cmd->t_task.t_transport_active, 1);
769 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
770 }
771
772 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
773 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
774 atomic_inc(&cmd->t_task.t_transport_queue_active);
775 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
776
777 atomic_inc(&qobj->queue_cnt);
778 wake_up_interruptible(&qobj->thread_wq);
779 }
780
781 static struct se_cmd *
782 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
783 {
784 struct se_cmd *cmd;
785 unsigned long flags;
786
787 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
788 if (list_empty(&qobj->qobj_list)) {
789 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
790 return NULL;
791 }
792 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
793
794 atomic_dec(&cmd->t_task.t_transport_queue_active);
795
796 list_del(&cmd->se_queue_node);
797 atomic_dec(&qobj->queue_cnt);
798 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
799
800 return cmd;
801 }
802
803 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
804 struct se_queue_obj *qobj)
805 {
806 struct se_cmd *t;
807 unsigned long flags;
808
809 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
810 if (!(atomic_read(&cmd->t_task.t_transport_queue_active))) {
811 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
812 return;
813 }
814
815 list_for_each_entry(t, &qobj->qobj_list, se_queue_node)
816 if (t == cmd) {
817 atomic_dec(&cmd->t_task.t_transport_queue_active);
818 atomic_dec(&qobj->queue_cnt);
819 list_del(&cmd->se_queue_node);
820 break;
821 }
822 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
823
824 if (atomic_read(&cmd->t_task.t_transport_queue_active)) {
825 printk(KERN_ERR "ITT: 0x%08x t_transport_queue_active: %d\n",
826 cmd->se_tfo->get_task_tag(cmd),
827 atomic_read(&cmd->t_task.t_transport_queue_active));
828 }
829 }
830
831 /*
832 * Completion function used by TCM subsystem plugins (such as FILEIO)
833 * for queueing up response from struct se_subsystem_api->do_task()
834 */
835 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
836 {
837 struct se_task *task = list_entry(cmd->t_task.t_task_list.next,
838 struct se_task, t_list);
839
840 if (good) {
841 cmd->scsi_status = SAM_STAT_GOOD;
842 task->task_scsi_status = GOOD;
843 } else {
844 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
845 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
846 task->task_se_cmd->transport_error_status =
847 PYX_TRANSPORT_ILLEGAL_REQUEST;
848 }
849
850 transport_complete_task(task, good);
851 }
852 EXPORT_SYMBOL(transport_complete_sync_cache);
853
854 /* transport_complete_task():
855 *
856 * Called from interrupt and non interrupt context depending
857 * on the transport plugin.
858 */
859 void transport_complete_task(struct se_task *task, int success)
860 {
861 struct se_cmd *cmd = task->task_se_cmd;
862 struct se_device *dev = task->se_dev;
863 int t_state;
864 unsigned long flags;
865 #if 0
866 printk(KERN_INFO "task: %p CDB: 0x%02x obj_ptr: %p\n", task,
867 cmd->t_task.t_task_cdb[0], dev);
868 #endif
869 if (dev)
870 atomic_inc(&dev->depth_left);
871
872 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
873 atomic_set(&task->task_active, 0);
874
875 /*
876 * See if any sense data exists, if so set the TASK_SENSE flag.
877 * Also check for any other post completion work that needs to be
878 * done by the plugins.
879 */
880 if (dev && dev->transport->transport_complete) {
881 if (dev->transport->transport_complete(task) != 0) {
882 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
883 task->task_sense = 1;
884 success = 1;
885 }
886 }
887
888 /*
889 * See if we are waiting for outstanding struct se_task
890 * to complete for an exception condition
891 */
892 if (atomic_read(&task->task_stop)) {
893 /*
894 * Decrement cmd->t_task.t_se_count if this task had
895 * previously thrown its timeout exception handler.
896 */
897 if (atomic_read(&task->task_timeout)) {
898 atomic_dec(&cmd->t_task.t_se_count);
899 atomic_set(&task->task_timeout, 0);
900 }
901 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
902
903 complete(&task->task_stop_comp);
904 return;
905 }
906 /*
907 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
908 * left counter to determine when the struct se_cmd is ready to be queued to
909 * the processing thread.
910 */
911 if (atomic_read(&task->task_timeout)) {
912 if (!(atomic_dec_and_test(
913 &cmd->t_task.t_task_cdbs_timeout_left))) {
914 spin_unlock_irqrestore(&cmd->t_task.t_state_lock,
915 flags);
916 return;
917 }
918 t_state = TRANSPORT_COMPLETE_TIMEOUT;
919 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
920
921 transport_add_cmd_to_queue(cmd, t_state);
922 return;
923 }
924 atomic_dec(&cmd->t_task.t_task_cdbs_timeout_left);
925
926 /*
927 * Decrement the outstanding t_task_cdbs_left count. The last
928 * struct se_task from struct se_cmd will complete itself into the
929 * device queue depending upon int success.
930 */
931 if (!(atomic_dec_and_test(&cmd->t_task.t_task_cdbs_left))) {
932 if (!success)
933 cmd->t_task.t_tasks_failed = 1;
934
935 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
936 return;
937 }
938
939 if (!success || cmd->t_task.t_tasks_failed) {
940 t_state = TRANSPORT_COMPLETE_FAILURE;
941 if (!task->task_error_status) {
942 task->task_error_status =
943 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
944 cmd->transport_error_status =
945 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
946 }
947 } else {
948 atomic_set(&cmd->t_task.t_transport_complete, 1);
949 t_state = TRANSPORT_COMPLETE_OK;
950 }
951 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
952
953 transport_add_cmd_to_queue(cmd, t_state);
954 }
955 EXPORT_SYMBOL(transport_complete_task);
956
957 /*
958 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
959 * struct se_task list are ready to be added to the active execution list
960 * struct se_device
961
962 * Called with se_dev_t->execute_task_lock called.
963 */
964 static inline int transport_add_task_check_sam_attr(
965 struct se_task *task,
966 struct se_task *task_prev,
967 struct se_device *dev)
968 {
969 /*
970 * No SAM Task attribute emulation enabled, add to tail of
971 * execution queue
972 */
973 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
974 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
975 return 0;
976 }
977 /*
978 * HEAD_OF_QUEUE attribute for received CDB, which means
979 * the first task that is associated with a struct se_cmd goes to
980 * head of the struct se_device->execute_task_list, and task_prev
981 * after that for each subsequent task
982 */
983 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
984 list_add(&task->t_execute_list,
985 (task_prev != NULL) ?
986 &task_prev->t_execute_list :
987 &dev->execute_task_list);
988
989 DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
990 " in execution queue\n",
991 T_TASK(task->task_se_cmd)->t_task_cdb[0]);
992 return 1;
993 }
994 /*
995 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
996 * transitioned from Dermant -> Active state, and are added to the end
997 * of the struct se_device->execute_task_list
998 */
999 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
1000 return 0;
1001 }
1002
1003 /* __transport_add_task_to_execute_queue():
1004 *
1005 * Called with se_dev_t->execute_task_lock called.
1006 */
1007 static void __transport_add_task_to_execute_queue(
1008 struct se_task *task,
1009 struct se_task *task_prev,
1010 struct se_device *dev)
1011 {
1012 int head_of_queue;
1013
1014 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
1015 atomic_inc(&dev->execute_tasks);
1016
1017 if (atomic_read(&task->task_state_active))
1018 return;
1019 /*
1020 * Determine if this task needs to go to HEAD_OF_QUEUE for the
1021 * state list as well. Running with SAM Task Attribute emulation
1022 * will always return head_of_queue == 0 here
1023 */
1024 if (head_of_queue)
1025 list_add(&task->t_state_list, (task_prev) ?
1026 &task_prev->t_state_list :
1027 &dev->state_task_list);
1028 else
1029 list_add_tail(&task->t_state_list, &dev->state_task_list);
1030
1031 atomic_set(&task->task_state_active, 1);
1032
1033 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
1034 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
1035 task, dev);
1036 }
1037
1038 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
1039 {
1040 struct se_device *dev;
1041 struct se_task *task;
1042 unsigned long flags;
1043
1044 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
1045 list_for_each_entry(task, &cmd->t_task.t_task_list, t_list) {
1046 dev = task->se_dev;
1047
1048 if (atomic_read(&task->task_state_active))
1049 continue;
1050
1051 spin_lock(&dev->execute_task_lock);
1052 list_add_tail(&task->t_state_list, &dev->state_task_list);
1053 atomic_set(&task->task_state_active, 1);
1054
1055 DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n",
1056 task->se_cmd->se_tfo->get_task_tag(
1057 task->task_se_cmd), task, dev);
1058
1059 spin_unlock(&dev->execute_task_lock);
1060 }
1061 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
1062 }
1063
1064 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
1065 {
1066 struct se_device *dev = cmd->se_dev;
1067 struct se_task *task, *task_prev = NULL;
1068 unsigned long flags;
1069
1070 spin_lock_irqsave(&dev->execute_task_lock, flags);
1071 list_for_each_entry(task, &cmd->t_task.t_task_list, t_list) {
1072 if (atomic_read(&task->task_execute_queue))
1073 continue;
1074 /*
1075 * __transport_add_task_to_execute_queue() handles the
1076 * SAM Task Attribute emulation if enabled
1077 */
1078 __transport_add_task_to_execute_queue(task, task_prev, dev);
1079 atomic_set(&task->task_execute_queue, 1);
1080 task_prev = task;
1081 }
1082 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
1083 }
1084
1085 /* transport_remove_task_from_execute_queue():
1086 *
1087 *
1088 */
1089 void transport_remove_task_from_execute_queue(
1090 struct se_task *task,
1091 struct se_device *dev)
1092 {
1093 unsigned long flags;
1094
1095 if (atomic_read(&task->task_execute_queue) == 0) {
1096 dump_stack();
1097 return;
1098 }
1099
1100 spin_lock_irqsave(&dev->execute_task_lock, flags);
1101 list_del(&task->t_execute_list);
1102 atomic_set(&task->task_execute_queue, 0);
1103 atomic_dec(&dev->execute_tasks);
1104 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
1105 }
1106
1107 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1108 {
1109 switch (cmd->data_direction) {
1110 case DMA_NONE:
1111 return "NONE";
1112 case DMA_FROM_DEVICE:
1113 return "READ";
1114 case DMA_TO_DEVICE:
1115 return "WRITE";
1116 case DMA_BIDIRECTIONAL:
1117 return "BIDI";
1118 default:
1119 break;
1120 }
1121
1122 return "UNKNOWN";
1123 }
1124
1125 void transport_dump_dev_state(
1126 struct se_device *dev,
1127 char *b,
1128 int *bl)
1129 {
1130 *bl += sprintf(b + *bl, "Status: ");
1131 switch (dev->dev_status) {
1132 case TRANSPORT_DEVICE_ACTIVATED:
1133 *bl += sprintf(b + *bl, "ACTIVATED");
1134 break;
1135 case TRANSPORT_DEVICE_DEACTIVATED:
1136 *bl += sprintf(b + *bl, "DEACTIVATED");
1137 break;
1138 case TRANSPORT_DEVICE_SHUTDOWN:
1139 *bl += sprintf(b + *bl, "SHUTDOWN");
1140 break;
1141 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1142 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1143 *bl += sprintf(b + *bl, "OFFLINE");
1144 break;
1145 default:
1146 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1147 break;
1148 }
1149
1150 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1151 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1152 dev->queue_depth);
1153 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
1154 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
1155 *bl += sprintf(b + *bl, " ");
1156 }
1157
1158 /* transport_release_all_cmds():
1159 *
1160 *
1161 */
1162 static void transport_release_all_cmds(struct se_device *dev)
1163 {
1164 struct se_cmd *cmd, *tcmd;
1165 int bug_out = 0, t_state;
1166 unsigned long flags;
1167
1168 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
1169 list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1170 se_queue_node) {
1171 t_state = cmd->t_state;
1172 list_del(&cmd->se_queue_node);
1173 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
1174 flags);
1175
1176 printk(KERN_ERR "Releasing ITT: 0x%08x, i_state: %u,"
1177 " t_state: %u directly\n",
1178 cmd->se_tfo->get_task_tag(cmd),
1179 cmd->se_tfo->get_cmd_state(cmd), t_state);
1180
1181 transport_release_fe_cmd(cmd);
1182 bug_out = 1;
1183
1184 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
1185 }
1186 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
1187 #if 0
1188 if (bug_out)
1189 BUG();
1190 #endif
1191 }
1192
1193 void transport_dump_vpd_proto_id(
1194 struct t10_vpd *vpd,
1195 unsigned char *p_buf,
1196 int p_buf_len)
1197 {
1198 unsigned char buf[VPD_TMP_BUF_SIZE];
1199 int len;
1200
1201 memset(buf, 0, VPD_TMP_BUF_SIZE);
1202 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1203
1204 switch (vpd->protocol_identifier) {
1205 case 0x00:
1206 sprintf(buf+len, "Fibre Channel\n");
1207 break;
1208 case 0x10:
1209 sprintf(buf+len, "Parallel SCSI\n");
1210 break;
1211 case 0x20:
1212 sprintf(buf+len, "SSA\n");
1213 break;
1214 case 0x30:
1215 sprintf(buf+len, "IEEE 1394\n");
1216 break;
1217 case 0x40:
1218 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1219 " Protocol\n");
1220 break;
1221 case 0x50:
1222 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1223 break;
1224 case 0x60:
1225 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1226 break;
1227 case 0x70:
1228 sprintf(buf+len, "Automation/Drive Interface Transport"
1229 " Protocol\n");
1230 break;
1231 case 0x80:
1232 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1233 break;
1234 default:
1235 sprintf(buf+len, "Unknown 0x%02x\n",
1236 vpd->protocol_identifier);
1237 break;
1238 }
1239
1240 if (p_buf)
1241 strncpy(p_buf, buf, p_buf_len);
1242 else
1243 printk(KERN_INFO "%s", buf);
1244 }
1245
1246 void
1247 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1248 {
1249 /*
1250 * Check if the Protocol Identifier Valid (PIV) bit is set..
1251 *
1252 * from spc3r23.pdf section 7.5.1
1253 */
1254 if (page_83[1] & 0x80) {
1255 vpd->protocol_identifier = (page_83[0] & 0xf0);
1256 vpd->protocol_identifier_set = 1;
1257 transport_dump_vpd_proto_id(vpd, NULL, 0);
1258 }
1259 }
1260 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1261
1262 int transport_dump_vpd_assoc(
1263 struct t10_vpd *vpd,
1264 unsigned char *p_buf,
1265 int p_buf_len)
1266 {
1267 unsigned char buf[VPD_TMP_BUF_SIZE];
1268 int ret = 0;
1269 int len;
1270
1271 memset(buf, 0, VPD_TMP_BUF_SIZE);
1272 len = sprintf(buf, "T10 VPD Identifier Association: ");
1273
1274 switch (vpd->association) {
1275 case 0x00:
1276 sprintf(buf+len, "addressed logical unit\n");
1277 break;
1278 case 0x10:
1279 sprintf(buf+len, "target port\n");
1280 break;
1281 case 0x20:
1282 sprintf(buf+len, "SCSI target device\n");
1283 break;
1284 default:
1285 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1286 ret = -EINVAL;
1287 break;
1288 }
1289
1290 if (p_buf)
1291 strncpy(p_buf, buf, p_buf_len);
1292 else
1293 printk("%s", buf);
1294
1295 return ret;
1296 }
1297
1298 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1299 {
1300 /*
1301 * The VPD identification association..
1302 *
1303 * from spc3r23.pdf Section 7.6.3.1 Table 297
1304 */
1305 vpd->association = (page_83[1] & 0x30);
1306 return transport_dump_vpd_assoc(vpd, NULL, 0);
1307 }
1308 EXPORT_SYMBOL(transport_set_vpd_assoc);
1309
1310 int transport_dump_vpd_ident_type(
1311 struct t10_vpd *vpd,
1312 unsigned char *p_buf,
1313 int p_buf_len)
1314 {
1315 unsigned char buf[VPD_TMP_BUF_SIZE];
1316 int ret = 0;
1317 int len;
1318
1319 memset(buf, 0, VPD_TMP_BUF_SIZE);
1320 len = sprintf(buf, "T10 VPD Identifier Type: ");
1321
1322 switch (vpd->device_identifier_type) {
1323 case 0x00:
1324 sprintf(buf+len, "Vendor specific\n");
1325 break;
1326 case 0x01:
1327 sprintf(buf+len, "T10 Vendor ID based\n");
1328 break;
1329 case 0x02:
1330 sprintf(buf+len, "EUI-64 based\n");
1331 break;
1332 case 0x03:
1333 sprintf(buf+len, "NAA\n");
1334 break;
1335 case 0x04:
1336 sprintf(buf+len, "Relative target port identifier\n");
1337 break;
1338 case 0x08:
1339 sprintf(buf+len, "SCSI name string\n");
1340 break;
1341 default:
1342 sprintf(buf+len, "Unsupported: 0x%02x\n",
1343 vpd->device_identifier_type);
1344 ret = -EINVAL;
1345 break;
1346 }
1347
1348 if (p_buf) {
1349 if (p_buf_len < strlen(buf)+1)
1350 return -EINVAL;
1351 strncpy(p_buf, buf, p_buf_len);
1352 } else {
1353 printk("%s", buf);
1354 }
1355
1356 return ret;
1357 }
1358
1359 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1360 {
1361 /*
1362 * The VPD identifier type..
1363 *
1364 * from spc3r23.pdf Section 7.6.3.1 Table 298
1365 */
1366 vpd->device_identifier_type = (page_83[1] & 0x0f);
1367 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1368 }
1369 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1370
1371 int transport_dump_vpd_ident(
1372 struct t10_vpd *vpd,
1373 unsigned char *p_buf,
1374 int p_buf_len)
1375 {
1376 unsigned char buf[VPD_TMP_BUF_SIZE];
1377 int ret = 0;
1378
1379 memset(buf, 0, VPD_TMP_BUF_SIZE);
1380
1381 switch (vpd->device_identifier_code_set) {
1382 case 0x01: /* Binary */
1383 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1384 &vpd->device_identifier[0]);
1385 break;
1386 case 0x02: /* ASCII */
1387 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1388 &vpd->device_identifier[0]);
1389 break;
1390 case 0x03: /* UTF-8 */
1391 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1392 &vpd->device_identifier[0]);
1393 break;
1394 default:
1395 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1396 " 0x%02x", vpd->device_identifier_code_set);
1397 ret = -EINVAL;
1398 break;
1399 }
1400
1401 if (p_buf)
1402 strncpy(p_buf, buf, p_buf_len);
1403 else
1404 printk("%s", buf);
1405
1406 return ret;
1407 }
1408
1409 int
1410 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1411 {
1412 static const char hex_str[] = "0123456789abcdef";
1413 int j = 0, i = 4; /* offset to start of the identifer */
1414
1415 /*
1416 * The VPD Code Set (encoding)
1417 *
1418 * from spc3r23.pdf Section 7.6.3.1 Table 296
1419 */
1420 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1421 switch (vpd->device_identifier_code_set) {
1422 case 0x01: /* Binary */
1423 vpd->device_identifier[j++] =
1424 hex_str[vpd->device_identifier_type];
1425 while (i < (4 + page_83[3])) {
1426 vpd->device_identifier[j++] =
1427 hex_str[(page_83[i] & 0xf0) >> 4];
1428 vpd->device_identifier[j++] =
1429 hex_str[page_83[i] & 0x0f];
1430 i++;
1431 }
1432 break;
1433 case 0x02: /* ASCII */
1434 case 0x03: /* UTF-8 */
1435 while (i < (4 + page_83[3]))
1436 vpd->device_identifier[j++] = page_83[i++];
1437 break;
1438 default:
1439 break;
1440 }
1441
1442 return transport_dump_vpd_ident(vpd, NULL, 0);
1443 }
1444 EXPORT_SYMBOL(transport_set_vpd_ident);
1445
1446 static void core_setup_task_attr_emulation(struct se_device *dev)
1447 {
1448 /*
1449 * If this device is from Target_Core_Mod/pSCSI, disable the
1450 * SAM Task Attribute emulation.
1451 *
1452 * This is currently not available in upsream Linux/SCSI Target
1453 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1454 */
1455 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1456 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1457 return;
1458 }
1459
1460 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1461 DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1462 " device\n", dev->transport->name,
1463 dev->transport->get_device_rev(dev));
1464 }
1465
1466 static void scsi_dump_inquiry(struct se_device *dev)
1467 {
1468 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1469 int i, device_type;
1470 /*
1471 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1472 */
1473 printk(" Vendor: ");
1474 for (i = 0; i < 8; i++)
1475 if (wwn->vendor[i] >= 0x20)
1476 printk("%c", wwn->vendor[i]);
1477 else
1478 printk(" ");
1479
1480 printk(" Model: ");
1481 for (i = 0; i < 16; i++)
1482 if (wwn->model[i] >= 0x20)
1483 printk("%c", wwn->model[i]);
1484 else
1485 printk(" ");
1486
1487 printk(" Revision: ");
1488 for (i = 0; i < 4; i++)
1489 if (wwn->revision[i] >= 0x20)
1490 printk("%c", wwn->revision[i]);
1491 else
1492 printk(" ");
1493
1494 printk("\n");
1495
1496 device_type = dev->transport->get_device_type(dev);
1497 printk(" Type: %s ", scsi_device_type(device_type));
1498 printk(" ANSI SCSI revision: %02x\n",
1499 dev->transport->get_device_rev(dev));
1500 }
1501
1502 struct se_device *transport_add_device_to_core_hba(
1503 struct se_hba *hba,
1504 struct se_subsystem_api *transport,
1505 struct se_subsystem_dev *se_dev,
1506 u32 device_flags,
1507 void *transport_dev,
1508 struct se_dev_limits *dev_limits,
1509 const char *inquiry_prod,
1510 const char *inquiry_rev)
1511 {
1512 int force_pt;
1513 struct se_device *dev;
1514
1515 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1516 if (!(dev)) {
1517 printk(KERN_ERR "Unable to allocate memory for se_dev_t\n");
1518 return NULL;
1519 }
1520
1521 transport_init_queue_obj(&dev->dev_queue_obj);
1522 dev->dev_flags = device_flags;
1523 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
1524 dev->dev_ptr = transport_dev;
1525 dev->se_hba = hba;
1526 dev->se_sub_dev = se_dev;
1527 dev->transport = transport;
1528 atomic_set(&dev->active_cmds, 0);
1529 INIT_LIST_HEAD(&dev->dev_list);
1530 INIT_LIST_HEAD(&dev->dev_sep_list);
1531 INIT_LIST_HEAD(&dev->dev_tmr_list);
1532 INIT_LIST_HEAD(&dev->execute_task_list);
1533 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1534 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1535 INIT_LIST_HEAD(&dev->state_task_list);
1536 spin_lock_init(&dev->execute_task_lock);
1537 spin_lock_init(&dev->delayed_cmd_lock);
1538 spin_lock_init(&dev->ordered_cmd_lock);
1539 spin_lock_init(&dev->state_task_lock);
1540 spin_lock_init(&dev->dev_alua_lock);
1541 spin_lock_init(&dev->dev_reservation_lock);
1542 spin_lock_init(&dev->dev_status_lock);
1543 spin_lock_init(&dev->dev_status_thr_lock);
1544 spin_lock_init(&dev->se_port_lock);
1545 spin_lock_init(&dev->se_tmr_lock);
1546
1547 dev->queue_depth = dev_limits->queue_depth;
1548 atomic_set(&dev->depth_left, dev->queue_depth);
1549 atomic_set(&dev->dev_ordered_id, 0);
1550
1551 se_dev_set_default_attribs(dev, dev_limits);
1552
1553 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1554 dev->creation_time = get_jiffies_64();
1555 spin_lock_init(&dev->stats_lock);
1556
1557 spin_lock(&hba->device_lock);
1558 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1559 hba->dev_count++;
1560 spin_unlock(&hba->device_lock);
1561 /*
1562 * Setup the SAM Task Attribute emulation for struct se_device
1563 */
1564 core_setup_task_attr_emulation(dev);
1565 /*
1566 * Force PR and ALUA passthrough emulation with internal object use.
1567 */
1568 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1569 /*
1570 * Setup the Reservations infrastructure for struct se_device
1571 */
1572 core_setup_reservations(dev, force_pt);
1573 /*
1574 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1575 */
1576 if (core_setup_alua(dev, force_pt) < 0)
1577 goto out;
1578
1579 /*
1580 * Startup the struct se_device processing thread
1581 */
1582 dev->process_thread = kthread_run(transport_processing_thread, dev,
1583 "LIO_%s", dev->transport->name);
1584 if (IS_ERR(dev->process_thread)) {
1585 printk(KERN_ERR "Unable to create kthread: LIO_%s\n",
1586 dev->transport->name);
1587 goto out;
1588 }
1589
1590 /*
1591 * Preload the initial INQUIRY const values if we are doing
1592 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1593 * passthrough because this is being provided by the backend LLD.
1594 * This is required so that transport_get_inquiry() copies these
1595 * originals once back into DEV_T10_WWN(dev) for the virtual device
1596 * setup.
1597 */
1598 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1599 if (!inquiry_prod || !inquiry_rev) {
1600 printk(KERN_ERR "All non TCM/pSCSI plugins require"
1601 " INQUIRY consts\n");
1602 goto out;
1603 }
1604
1605 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1606 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1607 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1608 }
1609 scsi_dump_inquiry(dev);
1610
1611 return dev;
1612 out:
1613 kthread_stop(dev->process_thread);
1614
1615 spin_lock(&hba->device_lock);
1616 list_del(&dev->dev_list);
1617 hba->dev_count--;
1618 spin_unlock(&hba->device_lock);
1619
1620 se_release_vpd_for_dev(dev);
1621
1622 kfree(dev);
1623
1624 return NULL;
1625 }
1626 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1627
1628 /* transport_generic_prepare_cdb():
1629 *
1630 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1631 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1632 * The point of this is since we are mapping iSCSI LUNs to
1633 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1634 * devices and HBAs for a loop.
1635 */
1636 static inline void transport_generic_prepare_cdb(
1637 unsigned char *cdb)
1638 {
1639 switch (cdb[0]) {
1640 case READ_10: /* SBC - RDProtect */
1641 case READ_12: /* SBC - RDProtect */
1642 case READ_16: /* SBC - RDProtect */
1643 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1644 case VERIFY: /* SBC - VRProtect */
1645 case VERIFY_16: /* SBC - VRProtect */
1646 case WRITE_VERIFY: /* SBC - VRProtect */
1647 case WRITE_VERIFY_12: /* SBC - VRProtect */
1648 break;
1649 default:
1650 cdb[1] &= 0x1f; /* clear logical unit number */
1651 break;
1652 }
1653 }
1654
1655 static struct se_task *
1656 transport_generic_get_task(struct se_cmd *cmd,
1657 enum dma_data_direction data_direction)
1658 {
1659 struct se_task *task;
1660 struct se_device *dev = cmd->se_dev;
1661 unsigned long flags;
1662
1663 task = dev->transport->alloc_task(cmd);
1664 if (!task) {
1665 printk(KERN_ERR "Unable to allocate struct se_task\n");
1666 return NULL;
1667 }
1668
1669 INIT_LIST_HEAD(&task->t_list);
1670 INIT_LIST_HEAD(&task->t_execute_list);
1671 INIT_LIST_HEAD(&task->t_state_list);
1672 init_completion(&task->task_stop_comp);
1673 task->task_no = cmd->t_task.t_tasks_no++;
1674 task->task_se_cmd = cmd;
1675 task->se_dev = dev;
1676 task->task_data_direction = data_direction;
1677
1678 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
1679 list_add_tail(&task->t_list, &cmd->t_task.t_task_list);
1680 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
1681
1682 return task;
1683 }
1684
1685 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1686
1687 /*
1688 * Used by fabric modules containing a local struct se_cmd within their
1689 * fabric dependent per I/O descriptor.
1690 */
1691 void transport_init_se_cmd(
1692 struct se_cmd *cmd,
1693 struct target_core_fabric_ops *tfo,
1694 struct se_session *se_sess,
1695 u32 data_length,
1696 int data_direction,
1697 int task_attr,
1698 unsigned char *sense_buffer)
1699 {
1700 INIT_LIST_HEAD(&cmd->se_lun_node);
1701 INIT_LIST_HEAD(&cmd->se_delayed_node);
1702 INIT_LIST_HEAD(&cmd->se_ordered_node);
1703
1704 INIT_LIST_HEAD(&cmd->t_task.t_mem_list);
1705 INIT_LIST_HEAD(&cmd->t_task.t_mem_bidi_list);
1706 INIT_LIST_HEAD(&cmd->t_task.t_task_list);
1707 init_completion(&cmd->t_task.transport_lun_fe_stop_comp);
1708 init_completion(&cmd->t_task.transport_lun_stop_comp);
1709 init_completion(&cmd->t_task.t_transport_stop_comp);
1710 spin_lock_init(&cmd->t_task.t_state_lock);
1711 atomic_set(&cmd->t_task.transport_dev_active, 1);
1712
1713 cmd->se_tfo = tfo;
1714 cmd->se_sess = se_sess;
1715 cmd->data_length = data_length;
1716 cmd->data_direction = data_direction;
1717 cmd->sam_task_attr = task_attr;
1718 cmd->sense_buffer = sense_buffer;
1719 }
1720 EXPORT_SYMBOL(transport_init_se_cmd);
1721
1722 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1723 {
1724 /*
1725 * Check if SAM Task Attribute emulation is enabled for this
1726 * struct se_device storage object
1727 */
1728 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1729 return 0;
1730
1731 if (cmd->sam_task_attr == MSG_ACA_TAG) {
1732 DEBUG_STA("SAM Task Attribute ACA"
1733 " emulation is not supported\n");
1734 return -EINVAL;
1735 }
1736 /*
1737 * Used to determine when ORDERED commands should go from
1738 * Dormant to Active status.
1739 */
1740 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1741 smp_mb__after_atomic_inc();
1742 DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1743 cmd->se_ordered_id, cmd->sam_task_attr,
1744 TRANSPORT(cmd->se_dev)->name);
1745 return 0;
1746 }
1747
1748 void transport_free_se_cmd(
1749 struct se_cmd *se_cmd)
1750 {
1751 if (se_cmd->se_tmr_req)
1752 core_tmr_release_req(se_cmd->se_tmr_req);
1753 /*
1754 * Check and free any extended CDB buffer that was allocated
1755 */
1756 if (se_cmd->t_task.t_task_cdb != se_cmd->t_task.__t_task_cdb)
1757 kfree(se_cmd->t_task.t_task_cdb);
1758 }
1759 EXPORT_SYMBOL(transport_free_se_cmd);
1760
1761 static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1762
1763 /* transport_generic_allocate_tasks():
1764 *
1765 * Called from fabric RX Thread.
1766 */
1767 int transport_generic_allocate_tasks(
1768 struct se_cmd *cmd,
1769 unsigned char *cdb)
1770 {
1771 int ret;
1772
1773 transport_generic_prepare_cdb(cdb);
1774
1775 /*
1776 * This is needed for early exceptions.
1777 */
1778 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1779
1780 /*
1781 * Ensure that the received CDB is less than the max (252 + 8) bytes
1782 * for VARIABLE_LENGTH_CMD
1783 */
1784 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1785 printk(KERN_ERR "Received SCSI CDB with command_size: %d that"
1786 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1787 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1788 return -EINVAL;
1789 }
1790 /*
1791 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1792 * allocate the additional extended CDB buffer now.. Otherwise
1793 * setup the pointer from __t_task_cdb to t_task_cdb.
1794 */
1795 if (scsi_command_size(cdb) > sizeof(cmd->t_task.__t_task_cdb)) {
1796 cmd->t_task.t_task_cdb = kzalloc(scsi_command_size(cdb),
1797 GFP_KERNEL);
1798 if (!(cmd->t_task.t_task_cdb)) {
1799 printk(KERN_ERR "Unable to allocate cmd->t_task.t_task_cdb"
1800 " %u > sizeof(cmd->t_task.__t_task_cdb): %lu ops\n",
1801 scsi_command_size(cdb),
1802 (unsigned long)sizeof(cmd->t_task.__t_task_cdb));
1803 return -ENOMEM;
1804 }
1805 } else
1806 cmd->t_task.t_task_cdb = &cmd->t_task.__t_task_cdb[0];
1807 /*
1808 * Copy the original CDB into cmd->t_task.
1809 */
1810 memcpy(cmd->t_task.t_task_cdb, cdb, scsi_command_size(cdb));
1811 /*
1812 * Setup the received CDB based on SCSI defined opcodes and
1813 * perform unit attention, persistent reservations and ALUA
1814 * checks for virtual device backends. The cmd->t_task.t_task_cdb
1815 * pointer is expected to be setup before we reach this point.
1816 */
1817 ret = transport_generic_cmd_sequencer(cmd, cdb);
1818 if (ret < 0)
1819 return ret;
1820 /*
1821 * Check for SAM Task Attribute Emulation
1822 */
1823 if (transport_check_alloc_task_attr(cmd) < 0) {
1824 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1825 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1826 return -EINVAL;
1827 }
1828 spin_lock(&cmd->se_lun->lun_sep_lock);
1829 if (cmd->se_lun->lun_sep)
1830 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1831 spin_unlock(&cmd->se_lun->lun_sep_lock);
1832 return 0;
1833 }
1834 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1835
1836 /*
1837 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1838 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1839 */
1840 int transport_generic_handle_cdb(
1841 struct se_cmd *cmd)
1842 {
1843 if (!cmd->se_lun) {
1844 dump_stack();
1845 printk(KERN_ERR "cmd->se_lun is NULL\n");
1846 return -EINVAL;
1847 }
1848
1849 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
1850 return 0;
1851 }
1852 EXPORT_SYMBOL(transport_generic_handle_cdb);
1853
1854 /*
1855 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1856 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1857 * complete setup in TCM process context w/ TFO->new_cmd_map().
1858 */
1859 int transport_generic_handle_cdb_map(
1860 struct se_cmd *cmd)
1861 {
1862 if (!cmd->se_lun) {
1863 dump_stack();
1864 printk(KERN_ERR "cmd->se_lun is NULL\n");
1865 return -EINVAL;
1866 }
1867
1868 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1869 return 0;
1870 }
1871 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1872
1873 /* transport_generic_handle_data():
1874 *
1875 *
1876 */
1877 int transport_generic_handle_data(
1878 struct se_cmd *cmd)
1879 {
1880 /*
1881 * For the software fabric case, then we assume the nexus is being
1882 * failed/shutdown when signals are pending from the kthread context
1883 * caller, so we return a failure. For the HW target mode case running
1884 * in interrupt code, the signal_pending() check is skipped.
1885 */
1886 if (!in_interrupt() && signal_pending(current))
1887 return -EPERM;
1888 /*
1889 * If the received CDB has aleady been ABORTED by the generic
1890 * target engine, we now call transport_check_aborted_status()
1891 * to queue any delated TASK_ABORTED status for the received CDB to the
1892 * fabric module as we are expecting no further incoming DATA OUT
1893 * sequences at this point.
1894 */
1895 if (transport_check_aborted_status(cmd, 1) != 0)
1896 return 0;
1897
1898 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1899 return 0;
1900 }
1901 EXPORT_SYMBOL(transport_generic_handle_data);
1902
1903 /* transport_generic_handle_tmr():
1904 *
1905 *
1906 */
1907 int transport_generic_handle_tmr(
1908 struct se_cmd *cmd)
1909 {
1910 /*
1911 * This is needed for early exceptions.
1912 */
1913 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1914
1915 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1916 return 0;
1917 }
1918 EXPORT_SYMBOL(transport_generic_handle_tmr);
1919
1920 void transport_generic_free_cmd_intr(
1921 struct se_cmd *cmd)
1922 {
1923 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1924 }
1925 EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1926
1927 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1928 {
1929 struct se_task *task, *task_tmp;
1930 unsigned long flags;
1931 int ret = 0;
1932
1933 DEBUG_TS("ITT[0x%08x] - Stopping tasks\n",
1934 cmd->se_tfo->get_task_tag(cmd));
1935
1936 /*
1937 * No tasks remain in the execution queue
1938 */
1939 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
1940 list_for_each_entry_safe(task, task_tmp,
1941 &cmd->t_task.t_task_list, t_list) {
1942 DEBUG_TS("task_no[%d] - Processing task %p\n",
1943 task->task_no, task);
1944 /*
1945 * If the struct se_task has not been sent and is not active,
1946 * remove the struct se_task from the execution queue.
1947 */
1948 if (!atomic_read(&task->task_sent) &&
1949 !atomic_read(&task->task_active)) {
1950 spin_unlock_irqrestore(&cmd->t_task.t_state_lock,
1951 flags);
1952 transport_remove_task_from_execute_queue(task,
1953 task->se_dev);
1954
1955 DEBUG_TS("task_no[%d] - Removed from execute queue\n",
1956 task->task_no);
1957 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
1958 continue;
1959 }
1960
1961 /*
1962 * If the struct se_task is active, sleep until it is returned
1963 * from the plugin.
1964 */
1965 if (atomic_read(&task->task_active)) {
1966 atomic_set(&task->task_stop, 1);
1967 spin_unlock_irqrestore(&cmd->t_task.t_state_lock,
1968 flags);
1969
1970 DEBUG_TS("task_no[%d] - Waiting to complete\n",
1971 task->task_no);
1972 wait_for_completion(&task->task_stop_comp);
1973 DEBUG_TS("task_no[%d] - Stopped successfully\n",
1974 task->task_no);
1975
1976 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
1977 atomic_dec(&cmd->t_task.t_task_cdbs_left);
1978
1979 atomic_set(&task->task_active, 0);
1980 atomic_set(&task->task_stop, 0);
1981 } else {
1982 DEBUG_TS("task_no[%d] - Did nothing\n", task->task_no);
1983 ret++;
1984 }
1985
1986 __transport_stop_task_timer(task, &flags);
1987 }
1988 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
1989
1990 return ret;
1991 }
1992
1993 /*
1994 * Handle SAM-esque emulation for generic transport request failures.
1995 */
1996 static void transport_generic_request_failure(
1997 struct se_cmd *cmd,
1998 struct se_device *dev,
1999 int complete,
2000 int sc)
2001 {
2002 DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
2003 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
2004 cmd->t_task.t_task_cdb[0]);
2005 DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:"
2006 " %d/%d transport_error_status: %d\n",
2007 cmd->se_tfo->get_cmd_state(cmd),
2008 cmd->t_state, cmd->deferred_t_state,
2009 cmd->transport_error_status);
2010 DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d"
2011 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
2012 " t_transport_active: %d t_transport_stop: %d"
2013 " t_transport_sent: %d\n", cmd->t_task.t_task_cdbs,
2014 atomic_read(&cmd->t_task.t_task_cdbs_left),
2015 atomic_read(&cmd->t_task.t_task_cdbs_sent),
2016 atomic_read(&cmd->t_task.t_task_cdbs_ex_left),
2017 atomic_read(&cmd->t_task.t_transport_active),
2018 atomic_read(&cmd->t_task.t_transport_stop),
2019 atomic_read(&cmd->t_task.t_transport_sent));
2020
2021 transport_stop_all_task_timers(cmd);
2022
2023 if (dev)
2024 atomic_inc(&dev->depth_left);
2025 /*
2026 * For SAM Task Attribute emulation for failed struct se_cmd
2027 */
2028 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2029 transport_complete_task_attr(cmd);
2030
2031 if (complete) {
2032 transport_direct_request_timeout(cmd);
2033 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2034 }
2035
2036 switch (cmd->transport_error_status) {
2037 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
2038 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2039 break;
2040 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
2041 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
2042 break;
2043 case PYX_TRANSPORT_INVALID_CDB_FIELD:
2044 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2045 break;
2046 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
2047 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
2048 break;
2049 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
2050 if (!sc)
2051 transport_new_cmd_failure(cmd);
2052 /*
2053 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2054 * we force this session to fall back to session
2055 * recovery.
2056 */
2057 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
2058 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
2059
2060 goto check_stop;
2061 case PYX_TRANSPORT_LU_COMM_FAILURE:
2062 case PYX_TRANSPORT_ILLEGAL_REQUEST:
2063 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2064 break;
2065 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
2066 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
2067 break;
2068 case PYX_TRANSPORT_WRITE_PROTECTED:
2069 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
2070 break;
2071 case PYX_TRANSPORT_RESERVATION_CONFLICT:
2072 /*
2073 * No SENSE Data payload for this case, set SCSI Status
2074 * and queue the response to $FABRIC_MOD.
2075 *
2076 * Uses linux/include/scsi/scsi.h SAM status codes defs
2077 */
2078 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2079 /*
2080 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2081 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2082 * CONFLICT STATUS.
2083 *
2084 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2085 */
2086 if (cmd->se_sess &&
2087 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2088 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2089 cmd->orig_fe_lun, 0x2C,
2090 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2091
2092 cmd->se_tfo->queue_status(cmd);
2093 goto check_stop;
2094 case PYX_TRANSPORT_USE_SENSE_REASON:
2095 /*
2096 * struct se_cmd->scsi_sense_reason already set
2097 */
2098 break;
2099 default:
2100 printk(KERN_ERR "Unknown transport error for CDB 0x%02x: %d\n",
2101 cmd->t_task.t_task_cdb[0],
2102 cmd->transport_error_status);
2103 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2104 break;
2105 }
2106
2107 if (!sc)
2108 transport_new_cmd_failure(cmd);
2109 else
2110 transport_send_check_condition_and_sense(cmd,
2111 cmd->scsi_sense_reason, 0);
2112 check_stop:
2113 transport_lun_remove_cmd(cmd);
2114 if (!(transport_cmd_check_stop_to_fabric(cmd)))
2115 ;
2116 }
2117
2118 static void transport_direct_request_timeout(struct se_cmd *cmd)
2119 {
2120 unsigned long flags;
2121
2122 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
2123 if (!(atomic_read(&cmd->t_task.t_transport_timeout))) {
2124 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2125 return;
2126 }
2127 if (atomic_read(&cmd->t_task.t_task_cdbs_timeout_left)) {
2128 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2129 return;
2130 }
2131
2132 atomic_sub(atomic_read(&cmd->t_task.t_transport_timeout),
2133 &cmd->t_task.t_se_count);
2134 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2135 }
2136
2137 static void transport_generic_request_timeout(struct se_cmd *cmd)
2138 {
2139 unsigned long flags;
2140
2141 /*
2142 * Reset cmd->t_task.t_se_count to allow transport_generic_remove()
2143 * to allow last call to free memory resources.
2144 */
2145 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
2146 if (atomic_read(&cmd->t_task.t_transport_timeout) > 1) {
2147 int tmp = (atomic_read(&cmd->t_task.t_transport_timeout) - 1);
2148
2149 atomic_sub(tmp, &cmd->t_task.t_se_count);
2150 }
2151 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2152
2153 transport_generic_remove(cmd, 0, 0);
2154 }
2155
2156 static int
2157 transport_generic_allocate_buf(struct se_cmd *cmd, u32 data_length)
2158 {
2159 unsigned char *buf;
2160
2161 buf = kzalloc(data_length, GFP_KERNEL);
2162 if (!(buf)) {
2163 printk(KERN_ERR "Unable to allocate memory for buffer\n");
2164 return -ENOMEM;
2165 }
2166
2167 cmd->t_task.t_tasks_se_num = 0;
2168 cmd->t_task.t_task_buf = buf;
2169
2170 return 0;
2171 }
2172
2173 static inline u32 transport_lba_21(unsigned char *cdb)
2174 {
2175 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2176 }
2177
2178 static inline u32 transport_lba_32(unsigned char *cdb)
2179 {
2180 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2181 }
2182
2183 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2184 {
2185 unsigned int __v1, __v2;
2186
2187 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2188 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2189
2190 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2191 }
2192
2193 /*
2194 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2195 */
2196 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2197 {
2198 unsigned int __v1, __v2;
2199
2200 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2201 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2202
2203 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2204 }
2205
2206 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2207 {
2208 unsigned long flags;
2209
2210 spin_lock_irqsave(&se_cmd->t_task.t_state_lock, flags);
2211 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2212 spin_unlock_irqrestore(&se_cmd->t_task.t_state_lock, flags);
2213 }
2214
2215 /*
2216 * Called from interrupt context.
2217 */
2218 static void transport_task_timeout_handler(unsigned long data)
2219 {
2220 struct se_task *task = (struct se_task *)data;
2221 struct se_cmd *cmd = task->task_se_cmd;
2222 unsigned long flags;
2223
2224 DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2225
2226 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
2227 if (task->task_flags & TF_STOP) {
2228 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2229 return;
2230 }
2231 task->task_flags &= ~TF_RUNNING;
2232
2233 /*
2234 * Determine if transport_complete_task() has already been called.
2235 */
2236 if (!(atomic_read(&task->task_active))) {
2237 DEBUG_TT("transport task: %p cmd: %p timeout task_active"
2238 " == 0\n", task, cmd);
2239 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2240 return;
2241 }
2242
2243 atomic_inc(&cmd->t_task.t_se_count);
2244 atomic_inc(&cmd->t_task.t_transport_timeout);
2245 cmd->t_task.t_tasks_failed = 1;
2246
2247 atomic_set(&task->task_timeout, 1);
2248 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2249 task->task_scsi_status = 1;
2250
2251 if (atomic_read(&task->task_stop)) {
2252 DEBUG_TT("transport task: %p cmd: %p timeout task_stop"
2253 " == 1\n", task, cmd);
2254 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2255 complete(&task->task_stop_comp);
2256 return;
2257 }
2258
2259 if (!(atomic_dec_and_test(&cmd->t_task.t_task_cdbs_left))) {
2260 DEBUG_TT("transport task: %p cmd: %p timeout non zero"
2261 " t_task_cdbs_left\n", task, cmd);
2262 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2263 return;
2264 }
2265 DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2266 task, cmd);
2267
2268 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
2269 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2270
2271 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2272 }
2273
2274 /*
2275 * Called with cmd->t_task.t_state_lock held.
2276 */
2277 static void transport_start_task_timer(struct se_task *task)
2278 {
2279 struct se_device *dev = task->se_dev;
2280 int timeout;
2281
2282 if (task->task_flags & TF_RUNNING)
2283 return;
2284 /*
2285 * If the task_timeout is disabled, exit now.
2286 */
2287 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
2288 if (!(timeout))
2289 return;
2290
2291 init_timer(&task->task_timer);
2292 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2293 task->task_timer.data = (unsigned long) task;
2294 task->task_timer.function = transport_task_timeout_handler;
2295
2296 task->task_flags |= TF_RUNNING;
2297 add_timer(&task->task_timer);
2298 #if 0
2299 printk(KERN_INFO "Starting task timer for cmd: %p task: %p seconds:"
2300 " %d\n", task->task_se_cmd, task, timeout);
2301 #endif
2302 }
2303
2304 /*
2305 * Called with spin_lock_irq(&cmd->t_task.t_state_lock) held.
2306 */
2307 void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2308 {
2309 struct se_cmd *cmd = task->task_se_cmd;
2310
2311 if (!(task->task_flags & TF_RUNNING))
2312 return;
2313
2314 task->task_flags |= TF_STOP;
2315 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, *flags);
2316
2317 del_timer_sync(&task->task_timer);
2318
2319 spin_lock_irqsave(&cmd->t_task.t_state_lock, *flags);
2320 task->task_flags &= ~TF_RUNNING;
2321 task->task_flags &= ~TF_STOP;
2322 }
2323
2324 static void transport_stop_all_task_timers(struct se_cmd *cmd)
2325 {
2326 struct se_task *task = NULL, *task_tmp;
2327 unsigned long flags;
2328
2329 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
2330 list_for_each_entry_safe(task, task_tmp,
2331 &cmd->t_task.t_task_list, t_list)
2332 __transport_stop_task_timer(task, &flags);
2333 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2334 }
2335
2336 static inline int transport_tcq_window_closed(struct se_device *dev)
2337 {
2338 if (dev->dev_tcq_window_closed++ <
2339 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2340 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2341 } else
2342 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2343
2344 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
2345 return 0;
2346 }
2347
2348 /*
2349 * Called from Fabric Module context from transport_execute_tasks()
2350 *
2351 * The return of this function determins if the tasks from struct se_cmd
2352 * get added to the execution queue in transport_execute_tasks(),
2353 * or are added to the delayed or ordered lists here.
2354 */
2355 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2356 {
2357 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2358 return 1;
2359 /*
2360 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2361 * to allow the passed struct se_cmd list of tasks to the front of the list.
2362 */
2363 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2364 atomic_inc(&cmd->se_dev->dev_hoq_count);
2365 smp_mb__after_atomic_inc();
2366 DEBUG_STA("Added HEAD_OF_QUEUE for CDB:"
2367 " 0x%02x, se_ordered_id: %u\n",
2368 cmd->t_task->t_task_cdb[0],
2369 cmd->se_ordered_id);
2370 return 1;
2371 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2372 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2373 list_add_tail(&cmd->se_ordered_node,
2374 &cmd->se_dev->ordered_cmd_list);
2375 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2376
2377 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2378 smp_mb__after_atomic_inc();
2379
2380 DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered"
2381 " list, se_ordered_id: %u\n",
2382 cmd->t_task.t_task_cdb[0],
2383 cmd->se_ordered_id);
2384 /*
2385 * Add ORDERED command to tail of execution queue if
2386 * no other older commands exist that need to be
2387 * completed first.
2388 */
2389 if (!(atomic_read(&cmd->se_dev->simple_cmds)))
2390 return 1;
2391 } else {
2392 /*
2393 * For SIMPLE and UNTAGGED Task Attribute commands
2394 */
2395 atomic_inc(&cmd->se_dev->simple_cmds);
2396 smp_mb__after_atomic_inc();
2397 }
2398 /*
2399 * Otherwise if one or more outstanding ORDERED task attribute exist,
2400 * add the dormant task(s) built for the passed struct se_cmd to the
2401 * execution queue and become in Active state for this struct se_device.
2402 */
2403 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2404 /*
2405 * Otherwise, add cmd w/ tasks to delayed cmd queue that
2406 * will be drained upon completion of HEAD_OF_QUEUE task.
2407 */
2408 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2409 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2410 list_add_tail(&cmd->se_delayed_node,
2411 &cmd->se_dev->delayed_cmd_list);
2412 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2413
2414 DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to"
2415 " delayed CMD list, se_ordered_id: %u\n",
2416 cmd->t_task.t_task_cdb[0], cmd->sam_task_attr,
2417 cmd->se_ordered_id);
2418 /*
2419 * Return zero to let transport_execute_tasks() know
2420 * not to add the delayed tasks to the execution list.
2421 */
2422 return 0;
2423 }
2424 /*
2425 * Otherwise, no ORDERED task attributes exist..
2426 */
2427 return 1;
2428 }
2429
2430 /*
2431 * Called from fabric module context in transport_generic_new_cmd() and
2432 * transport_generic_process_write()
2433 */
2434 static int transport_execute_tasks(struct se_cmd *cmd)
2435 {
2436 int add_tasks;
2437
2438 if (!(cmd->se_cmd_flags & SCF_SE_DISABLE_ONLINE_CHECK)) {
2439 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2440 cmd->transport_error_status =
2441 PYX_TRANSPORT_LU_COMM_FAILURE;
2442 transport_generic_request_failure(cmd, NULL, 0, 1);
2443 return 0;
2444 }
2445 }
2446 /*
2447 * Call transport_cmd_check_stop() to see if a fabric exception
2448 * has occurred that prevents execution.
2449 */
2450 if (!(transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))) {
2451 /*
2452 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2453 * attribute for the tasks of the received struct se_cmd CDB
2454 */
2455 add_tasks = transport_execute_task_attr(cmd);
2456 if (!add_tasks)
2457 goto execute_tasks;
2458 /*
2459 * This calls transport_add_tasks_from_cmd() to handle
2460 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2461 * (if enabled) in __transport_add_task_to_execute_queue() and
2462 * transport_add_task_check_sam_attr().
2463 */
2464 transport_add_tasks_from_cmd(cmd);
2465 }
2466 /*
2467 * Kick the execution queue for the cmd associated struct se_device
2468 * storage object.
2469 */
2470 execute_tasks:
2471 __transport_execute_tasks(cmd->se_dev);
2472 return 0;
2473 }
2474
2475 /*
2476 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2477 * from struct se_device->execute_task_list and
2478 *
2479 * Called from transport_processing_thread()
2480 */
2481 static int __transport_execute_tasks(struct se_device *dev)
2482 {
2483 int error;
2484 struct se_cmd *cmd = NULL;
2485 struct se_task *task = NULL;
2486 unsigned long flags;
2487
2488 /*
2489 * Check if there is enough room in the device and HBA queue to send
2490 * struct se_transport_task's to the selected transport.
2491 */
2492 check_depth:
2493 if (!atomic_read(&dev->depth_left))
2494 return transport_tcq_window_closed(dev);
2495
2496 dev->dev_tcq_window_closed = 0;
2497
2498 spin_lock_irq(&dev->execute_task_lock);
2499 if (list_empty(&dev->execute_task_list)) {
2500 spin_unlock_irq(&dev->execute_task_lock);
2501 return 0;
2502 }
2503 task = list_first_entry(&dev->execute_task_list,
2504 struct se_task, t_execute_list);
2505 list_del(&task->t_execute_list);
2506 atomic_set(&task->task_execute_queue, 0);
2507 atomic_dec(&dev->execute_tasks);
2508 spin_unlock_irq(&dev->execute_task_lock);
2509
2510 atomic_dec(&dev->depth_left);
2511
2512 cmd = task->task_se_cmd;
2513
2514 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
2515 atomic_set(&task->task_active, 1);
2516 atomic_set(&task->task_sent, 1);
2517 atomic_inc(&cmd->t_task.t_task_cdbs_sent);
2518
2519 if (atomic_read(&cmd->t_task.t_task_cdbs_sent) ==
2520 cmd->t_task.t_task_cdbs)
2521 atomic_set(&cmd->transport_sent, 1);
2522
2523 transport_start_task_timer(task);
2524 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2525 /*
2526 * The struct se_cmd->transport_emulate_cdb() function pointer is used
2527 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2528 * struct se_subsystem_api->do_task() caller below.
2529 */
2530 if (cmd->transport_emulate_cdb) {
2531 error = cmd->transport_emulate_cdb(cmd);
2532 if (error != 0) {
2533 cmd->transport_error_status = error;
2534 atomic_set(&task->task_active, 0);
2535 atomic_set(&cmd->transport_sent, 0);
2536 transport_stop_tasks_for_cmd(cmd);
2537 transport_generic_request_failure(cmd, dev, 0, 1);
2538 goto check_depth;
2539 }
2540 /*
2541 * Handle the successful completion for transport_emulate_cdb()
2542 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2543 * Otherwise the caller is expected to complete the task with
2544 * proper status.
2545 */
2546 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2547 cmd->scsi_status = SAM_STAT_GOOD;
2548 task->task_scsi_status = GOOD;
2549 transport_complete_task(task, 1);
2550 }
2551 } else {
2552 /*
2553 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2554 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2555 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2556 * LUN emulation code.
2557 *
2558 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2559 * call ->do_task() directly and let the underlying TCM subsystem plugin
2560 * code handle the CDB emulation.
2561 */
2562 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2563 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2564 error = transport_emulate_control_cdb(task);
2565 else
2566 error = dev->transport->do_task(task);
2567
2568 if (error != 0) {
2569 cmd->transport_error_status = error;
2570 atomic_set(&task->task_active, 0);
2571 atomic_set(&cmd->transport_sent, 0);
2572 transport_stop_tasks_for_cmd(cmd);
2573 transport_generic_request_failure(cmd, dev, 0, 1);
2574 }
2575 }
2576
2577 goto check_depth;
2578
2579 return 0;
2580 }
2581
2582 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2583 {
2584 unsigned long flags;
2585 /*
2586 * Any unsolicited data will get dumped for failed command inside of
2587 * the fabric plugin
2588 */
2589 spin_lock_irqsave(&se_cmd->t_task.t_state_lock, flags);
2590 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2591 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2592 spin_unlock_irqrestore(&se_cmd->t_task.t_state_lock, flags);
2593
2594 se_cmd->se_tfo->new_cmd_failure(se_cmd);
2595 }
2596
2597 static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2598
2599 static inline u32 transport_get_sectors_6(
2600 unsigned char *cdb,
2601 struct se_cmd *cmd,
2602 int *ret)
2603 {
2604 struct se_device *dev = cmd->se_dev;
2605
2606 /*
2607 * Assume TYPE_DISK for non struct se_device objects.
2608 * Use 8-bit sector value.
2609 */
2610 if (!dev)
2611 goto type_disk;
2612
2613 /*
2614 * Use 24-bit allocation length for TYPE_TAPE.
2615 */
2616 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2617 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2618
2619 /*
2620 * Everything else assume TYPE_DISK Sector CDB location.
2621 * Use 8-bit sector value.
2622 */
2623 type_disk:
2624 return (u32)cdb[4];
2625 }
2626
2627 static inline u32 transport_get_sectors_10(
2628 unsigned char *cdb,
2629 struct se_cmd *cmd,
2630 int *ret)
2631 {
2632 struct se_device *dev = cmd->se_dev;
2633
2634 /*
2635 * Assume TYPE_DISK for non struct se_device objects.
2636 * Use 16-bit sector value.
2637 */
2638 if (!dev)
2639 goto type_disk;
2640
2641 /*
2642 * XXX_10 is not defined in SSC, throw an exception
2643 */
2644 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2645 *ret = -EINVAL;
2646 return 0;
2647 }
2648
2649 /*
2650 * Everything else assume TYPE_DISK Sector CDB location.
2651 * Use 16-bit sector value.
2652 */
2653 type_disk:
2654 return (u32)(cdb[7] << 8) + cdb[8];
2655 }
2656
2657 static inline u32 transport_get_sectors_12(
2658 unsigned char *cdb,
2659 struct se_cmd *cmd,
2660 int *ret)
2661 {
2662 struct se_device *dev = cmd->se_dev;
2663
2664 /*
2665 * Assume TYPE_DISK for non struct se_device objects.
2666 * Use 32-bit sector value.
2667 */
2668 if (!dev)
2669 goto type_disk;
2670
2671 /*
2672 * XXX_12 is not defined in SSC, throw an exception
2673 */
2674 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2675 *ret = -EINVAL;
2676 return 0;
2677 }
2678
2679 /*
2680 * Everything else assume TYPE_DISK Sector CDB location.
2681 * Use 32-bit sector value.
2682 */
2683 type_disk:
2684 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2685 }
2686
2687 static inline u32 transport_get_sectors_16(
2688 unsigned char *cdb,
2689 struct se_cmd *cmd,
2690 int *ret)
2691 {
2692 struct se_device *dev = cmd->se_dev;
2693
2694 /*
2695 * Assume TYPE_DISK for non struct se_device objects.
2696 * Use 32-bit sector value.
2697 */
2698 if (!dev)
2699 goto type_disk;
2700
2701 /*
2702 * Use 24-bit allocation length for TYPE_TAPE.
2703 */
2704 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2705 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2706
2707 type_disk:
2708 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2709 (cdb[12] << 8) + cdb[13];
2710 }
2711
2712 /*
2713 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2714 */
2715 static inline u32 transport_get_sectors_32(
2716 unsigned char *cdb,
2717 struct se_cmd *cmd,
2718 int *ret)
2719 {
2720 /*
2721 * Assume TYPE_DISK for non struct se_device objects.
2722 * Use 32-bit sector value.
2723 */
2724 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2725 (cdb[30] << 8) + cdb[31];
2726
2727 }
2728
2729 static inline u32 transport_get_size(
2730 u32 sectors,
2731 unsigned char *cdb,
2732 struct se_cmd *cmd)
2733 {
2734 struct se_device *dev = cmd->se_dev;
2735
2736 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2737 if (cdb[1] & 1) { /* sectors */
2738 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2739 } else /* bytes */
2740 return sectors;
2741 }
2742 #if 0
2743 printk(KERN_INFO "Returning block_size: %u, sectors: %u == %u for"
2744 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2745 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2746 dev->transport->name);
2747 #endif
2748 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2749 }
2750
2751 unsigned char transport_asciihex_to_binaryhex(unsigned char val[2])
2752 {
2753 unsigned char result = 0;
2754 /*
2755 * MSB
2756 */
2757 if ((val[0] >= 'a') && (val[0] <= 'f'))
2758 result = ((val[0] - 'a' + 10) & 0xf) << 4;
2759 else
2760 if ((val[0] >= 'A') && (val[0] <= 'F'))
2761 result = ((val[0] - 'A' + 10) & 0xf) << 4;
2762 else /* digit */
2763 result = ((val[0] - '0') & 0xf) << 4;
2764 /*
2765 * LSB
2766 */
2767 if ((val[1] >= 'a') && (val[1] <= 'f'))
2768 result |= ((val[1] - 'a' + 10) & 0xf);
2769 else
2770 if ((val[1] >= 'A') && (val[1] <= 'F'))
2771 result |= ((val[1] - 'A' + 10) & 0xf);
2772 else /* digit */
2773 result |= ((val[1] - '0') & 0xf);
2774
2775 return result;
2776 }
2777 EXPORT_SYMBOL(transport_asciihex_to_binaryhex);
2778
2779 static void transport_xor_callback(struct se_cmd *cmd)
2780 {
2781 unsigned char *buf, *addr;
2782 struct se_mem *se_mem;
2783 unsigned int offset;
2784 int i;
2785 /*
2786 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2787 *
2788 * 1) read the specified logical block(s);
2789 * 2) transfer logical blocks from the data-out buffer;
2790 * 3) XOR the logical blocks transferred from the data-out buffer with
2791 * the logical blocks read, storing the resulting XOR data in a buffer;
2792 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2793 * blocks transferred from the data-out buffer; and
2794 * 5) transfer the resulting XOR data to the data-in buffer.
2795 */
2796 buf = kmalloc(cmd->data_length, GFP_KERNEL);
2797 if (!(buf)) {
2798 printk(KERN_ERR "Unable to allocate xor_callback buf\n");
2799 return;
2800 }
2801 /*
2802 * Copy the scatterlist WRITE buffer located at cmd->t_task.t_mem_list
2803 * into the locally allocated *buf
2804 */
2805 transport_memcpy_se_mem_read_contig(cmd, buf, &cmd->t_task.t_mem_list);
2806 /*
2807 * Now perform the XOR against the BIDI read memory located at
2808 * cmd->t_task.t_mem_bidi_list
2809 */
2810
2811 offset = 0;
2812 list_for_each_entry(se_mem, &cmd->t_task.t_mem_bidi_list, se_list) {
2813 addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0);
2814 if (!(addr))
2815 goto out;
2816
2817 for (i = 0; i < se_mem->se_len; i++)
2818 *(addr + se_mem->se_off + i) ^= *(buf + offset + i);
2819
2820 offset += se_mem->se_len;
2821 kunmap_atomic(addr, KM_USER0);
2822 }
2823 out:
2824 kfree(buf);
2825 }
2826
2827 /*
2828 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2829 */
2830 static int transport_get_sense_data(struct se_cmd *cmd)
2831 {
2832 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2833 struct se_device *dev;
2834 struct se_task *task = NULL, *task_tmp;
2835 unsigned long flags;
2836 u32 offset = 0;
2837
2838 WARN_ON(!cmd->se_lun);
2839
2840 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
2841 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2842 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2843 return 0;
2844 }
2845
2846 list_for_each_entry_safe(task, task_tmp,
2847 &cmd->t_task.t_task_list, t_list) {
2848
2849 if (!task->task_sense)
2850 continue;
2851
2852 dev = task->se_dev;
2853 if (!(dev))
2854 continue;
2855
2856 if (!dev->transport->get_sense_buffer) {
2857 printk(KERN_ERR "dev->transport->get_sense_buffer"
2858 " is NULL\n");
2859 continue;
2860 }
2861
2862 sense_buffer = dev->transport->get_sense_buffer(task);
2863 if (!(sense_buffer)) {
2864 printk(KERN_ERR "ITT[0x%08x]_TASK[%d]: Unable to locate"
2865 " sense buffer for task with sense\n",
2866 cmd->se_tfo->get_task_tag(cmd), task->task_no);
2867 continue;
2868 }
2869 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2870
2871 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2872 TRANSPORT_SENSE_BUFFER);
2873
2874 memcpy(&buffer[offset], sense_buffer,
2875 TRANSPORT_SENSE_BUFFER);
2876 cmd->scsi_status = task->task_scsi_status;
2877 /* Automatically padded */
2878 cmd->scsi_sense_length =
2879 (TRANSPORT_SENSE_BUFFER + offset);
2880
2881 printk(KERN_INFO "HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2882 " and sense\n",
2883 dev->se_hba->hba_id, dev->transport->name,
2884 cmd->scsi_status);
2885 return 0;
2886 }
2887 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
2888
2889 return -1;
2890 }
2891
2892 static int transport_allocate_resources(struct se_cmd *cmd)
2893 {
2894 u32 length = cmd->data_length;
2895
2896 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
2897 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB))
2898 return transport_generic_get_mem(cmd, length, PAGE_SIZE);
2899 else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB)
2900 return transport_generic_allocate_buf(cmd, length);
2901 else
2902 return 0;
2903 }
2904
2905 static int
2906 transport_handle_reservation_conflict(struct se_cmd *cmd)
2907 {
2908 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2909 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2910 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2911 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2912 /*
2913 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2914 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2915 * CONFLICT STATUS.
2916 *
2917 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2918 */
2919 if (cmd->se_sess &&
2920 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2921 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2922 cmd->orig_fe_lun, 0x2C,
2923 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2924 return -EINVAL;
2925 }
2926
2927 /* transport_generic_cmd_sequencer():
2928 *
2929 * Generic Command Sequencer that should work for most DAS transport
2930 * drivers.
2931 *
2932 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2933 * RX Thread.
2934 *
2935 * FIXME: Need to support other SCSI OPCODES where as well.
2936 */
2937 static int transport_generic_cmd_sequencer(
2938 struct se_cmd *cmd,
2939 unsigned char *cdb)
2940 {
2941 struct se_device *dev = cmd->se_dev;
2942 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2943 int ret = 0, sector_ret = 0, passthrough;
2944 u32 sectors = 0, size = 0, pr_reg_type = 0;
2945 u16 service_action;
2946 u8 alua_ascq = 0;
2947 /*
2948 * Check for an existing UNIT ATTENTION condition
2949 */
2950 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2951 cmd->transport_wait_for_tasks =
2952 &transport_nop_wait_for_tasks;
2953 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2954 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2955 return -EINVAL;
2956 }
2957 /*
2958 * Check status of Asymmetric Logical Unit Assignment port
2959 */
2960 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2961 if (ret != 0) {
2962 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2963 /*
2964 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2965 * The ALUA additional sense code qualifier (ASCQ) is determined
2966 * by the ALUA primary or secondary access state..
2967 */
2968 if (ret > 0) {
2969 #if 0
2970 printk(KERN_INFO "[%s]: ALUA TG Port not available,"
2971 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2972 cmd->se_tfo->get_fabric_name(), alua_ascq);
2973 #endif
2974 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2975 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2976 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2977 return -EINVAL;
2978 }
2979 goto out_invalid_cdb_field;
2980 }
2981 /*
2982 * Check status for SPC-3 Persistent Reservations
2983 */
2984 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2985 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2986 cmd, cdb, pr_reg_type) != 0)
2987 return transport_handle_reservation_conflict(cmd);
2988 /*
2989 * This means the CDB is allowed for the SCSI Initiator port
2990 * when said port is *NOT* holding the legacy SPC-2 or
2991 * SPC-3 Persistent Reservation.
2992 */
2993 }
2994
2995 switch (cdb[0]) {
2996 case READ_6:
2997 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2998 if (sector_ret)
2999 goto out_unsupported_cdb;
3000 size = transport_get_size(sectors, cdb, cmd);
3001 cmd->transport_split_cdb = &split_cdb_XX_6;
3002 cmd->t_task.t_task_lba = transport_lba_21(cdb);
3003 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3004 break;
3005 case READ_10:
3006 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3007 if (sector_ret)
3008 goto out_unsupported_cdb;
3009 size = transport_get_size(sectors, cdb, cmd);
3010 cmd->transport_split_cdb = &split_cdb_XX_10;
3011 cmd->t_task.t_task_lba = transport_lba_32(cdb);
3012 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3013 break;
3014 case READ_12:
3015 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3016 if (sector_ret)
3017 goto out_unsupported_cdb;
3018 size = transport_get_size(sectors, cdb, cmd);
3019 cmd->transport_split_cdb = &split_cdb_XX_12;
3020 cmd->t_task.t_task_lba = transport_lba_32(cdb);
3021 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3022 break;
3023 case READ_16:
3024 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3025 if (sector_ret)
3026 goto out_unsupported_cdb;
3027 size = transport_get_size(sectors, cdb, cmd);
3028 cmd->transport_split_cdb = &split_cdb_XX_16;
3029 cmd->t_task.t_task_lba = transport_lba_64(cdb);
3030 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3031 break;
3032 case WRITE_6:
3033 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
3034 if (sector_ret)
3035 goto out_unsupported_cdb;
3036 size = transport_get_size(sectors, cdb, cmd);
3037 cmd->transport_split_cdb = &split_cdb_XX_6;
3038 cmd->t_task.t_task_lba = transport_lba_21(cdb);
3039 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3040 break;
3041 case WRITE_10:
3042 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3043 if (sector_ret)
3044 goto out_unsupported_cdb;
3045 size = transport_get_size(sectors, cdb, cmd);
3046 cmd->transport_split_cdb = &split_cdb_XX_10;
3047 cmd->t_task.t_task_lba = transport_lba_32(cdb);
3048 cmd->t_task.t_tasks_fua = (cdb[1] & 0x8);
3049 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3050 break;
3051 case WRITE_12:
3052 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3053 if (sector_ret)
3054 goto out_unsupported_cdb;
3055 size = transport_get_size(sectors, cdb, cmd);
3056 cmd->transport_split_cdb = &split_cdb_XX_12;
3057 cmd->t_task.t_task_lba = transport_lba_32(cdb);
3058 cmd->t_task.t_tasks_fua = (cdb[1] & 0x8);
3059 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3060 break;
3061 case WRITE_16:
3062 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3063 if (sector_ret)
3064 goto out_unsupported_cdb;
3065 size = transport_get_size(sectors, cdb, cmd);
3066 cmd->transport_split_cdb = &split_cdb_XX_16;
3067 cmd->t_task.t_task_lba = transport_lba_64(cdb);
3068 cmd->t_task.t_tasks_fua = (cdb[1] & 0x8);
3069 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3070 break;
3071 case XDWRITEREAD_10:
3072 if ((cmd->data_direction != DMA_TO_DEVICE) ||
3073 !(cmd->t_task.t_tasks_bidi))
3074 goto out_invalid_cdb_field;
3075 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3076 if (sector_ret)
3077 goto out_unsupported_cdb;
3078 size = transport_get_size(sectors, cdb, cmd);
3079 cmd->transport_split_cdb = &split_cdb_XX_10;
3080 cmd->t_task.t_task_lba = transport_lba_32(cdb);
3081 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3082 passthrough = (dev->transport->transport_type ==
3083 TRANSPORT_PLUGIN_PHBA_PDEV);
3084 /*
3085 * Skip the remaining assignments for TCM/PSCSI passthrough
3086 */
3087 if (passthrough)
3088 break;
3089 /*
3090 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3091 */
3092 cmd->transport_complete_callback = &transport_xor_callback;
3093 cmd->t_task.t_tasks_fua = (cdb[1] & 0x8);
3094 break;
3095 case VARIABLE_LENGTH_CMD:
3096 service_action = get_unaligned_be16(&cdb[8]);
3097 /*
3098 * Determine if this is TCM/PSCSI device and we should disable
3099 * internal emulation for this CDB.
3100 */
3101 passthrough = (dev->transport->transport_type ==
3102 TRANSPORT_PLUGIN_PHBA_PDEV);
3103
3104 switch (service_action) {
3105 case XDWRITEREAD_32:
3106 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3107 if (sector_ret)
3108 goto out_unsupported_cdb;
3109 size = transport_get_size(sectors, cdb, cmd);
3110 /*
3111 * Use WRITE_32 and READ_32 opcodes for the emulated
3112 * XDWRITE_READ_32 logic.
3113 */
3114 cmd->transport_split_cdb = &split_cdb_XX_32;
3115 cmd->t_task.t_task_lba = transport_lba_64_ext(cdb);
3116 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3117
3118 /*
3119 * Skip the remaining assignments for TCM/PSCSI passthrough
3120 */
3121 if (passthrough)
3122 break;
3123
3124 /*
3125 * Setup BIDI XOR callback to be run during
3126 * transport_generic_complete_ok()
3127 */
3128 cmd->transport_complete_callback = &transport_xor_callback;
3129 cmd->t_task.t_tasks_fua = (cdb[10] & 0x8);
3130 break;
3131 case WRITE_SAME_32:
3132 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3133 if (sector_ret)
3134 goto out_unsupported_cdb;
3135
3136 if (sectors != 0)
3137 size = transport_get_size(sectors, cdb, cmd);
3138 else
3139 size = dev->se_sub_dev->se_dev_attrib.block_size;
3140
3141 cmd->t_task.t_task_lba = get_unaligned_be64(&cdb[12]);
3142 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3143
3144 /*
3145 * Skip the remaining assignments for TCM/PSCSI passthrough
3146 */
3147 if (passthrough)
3148 break;
3149
3150 if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) {
3151 printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
3152 " bits not supported for Block Discard"
3153 " Emulation\n");
3154 goto out_invalid_cdb_field;
3155 }
3156 /*
3157 * Currently for the emulated case we only accept
3158 * tpws with the UNMAP=1 bit set.
3159 */
3160 if (!(cdb[10] & 0x08)) {
3161 printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not"
3162 " supported for Block Discard Emulation\n");
3163 goto out_invalid_cdb_field;
3164 }
3165 break;
3166 default:
3167 printk(KERN_ERR "VARIABLE_LENGTH_CMD service action"
3168 " 0x%04x not supported\n", service_action);
3169 goto out_unsupported_cdb;
3170 }
3171 break;
3172 case MAINTENANCE_IN:
3173 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3174 /* MAINTENANCE_IN from SCC-2 */
3175 /*
3176 * Check for emulated MI_REPORT_TARGET_PGS.
3177 */
3178 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3179 cmd->transport_emulate_cdb =
3180 (su_dev->t10_alua.alua_type ==
3181 SPC3_ALUA_EMULATED) ?
3182 core_emulate_report_target_port_groups :
3183 NULL;
3184 }
3185 size = (cdb[6] << 24) | (cdb[7] << 16) |
3186 (cdb[8] << 8) | cdb[9];
3187 } else {
3188 /* GPCMD_SEND_KEY from multi media commands */
3189 size = (cdb[8] << 8) + cdb[9];
3190 }
3191 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3192 break;
3193 case MODE_SELECT:
3194 size = cdb[4];
3195 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3196 break;
3197 case MODE_SELECT_10:
3198 size = (cdb[7] << 8) + cdb[8];
3199 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3200 break;
3201 case MODE_SENSE:
3202 size = cdb[4];
3203 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3204 break;
3205 case MODE_SENSE_10:
3206 case GPCMD_READ_BUFFER_CAPACITY:
3207 case GPCMD_SEND_OPC:
3208 case LOG_SELECT:
3209 case LOG_SENSE:
3210 size = (cdb[7] << 8) + cdb[8];
3211 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3212 break;
3213 case READ_BLOCK_LIMITS:
3214 size = READ_BLOCK_LEN;
3215 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3216 break;
3217 case GPCMD_GET_CONFIGURATION:
3218 case GPCMD_READ_FORMAT_CAPACITIES:
3219 case GPCMD_READ_DISC_INFO:
3220 case GPCMD_READ_TRACK_RZONE_INFO:
3221 size = (cdb[7] << 8) + cdb[8];
3222 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3223 break;
3224 case PERSISTENT_RESERVE_IN:
3225 case PERSISTENT_RESERVE_OUT:
3226 cmd->transport_emulate_cdb =
3227 (su_dev->t10_pr.res_type ==
3228 SPC3_PERSISTENT_RESERVATIONS) ?
3229 core_scsi3_emulate_pr : NULL;
3230 size = (cdb[7] << 8) + cdb[8];
3231 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3232 break;
3233 case GPCMD_MECHANISM_STATUS:
3234 case GPCMD_READ_DVD_STRUCTURE:
3235 size = (cdb[8] << 8) + cdb[9];
3236 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3237 break;
3238 case READ_POSITION:
3239 size = READ_POSITION_LEN;
3240 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3241 break;
3242 case MAINTENANCE_OUT:
3243 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3244 /* MAINTENANCE_OUT from SCC-2
3245 *
3246 * Check for emulated MO_SET_TARGET_PGS.
3247 */
3248 if (cdb[1] == MO_SET_TARGET_PGS) {
3249 cmd->transport_emulate_cdb =
3250 (su_dev->t10_alua.alua_type ==
3251 SPC3_ALUA_EMULATED) ?
3252 core_emulate_set_target_port_groups :
3253 NULL;
3254 }
3255
3256 size = (cdb[6] << 24) | (cdb[7] << 16) |
3257 (cdb[8] << 8) | cdb[9];
3258 } else {
3259 /* GPCMD_REPORT_KEY from multi media commands */
3260 size = (cdb[8] << 8) + cdb[9];
3261 }
3262 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3263 break;
3264 case INQUIRY:
3265 size = (cdb[3] << 8) + cdb[4];
3266 /*
3267 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3268 * See spc4r17 section 5.3
3269 */
3270 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3271 cmd->sam_task_attr = MSG_HEAD_TAG;
3272 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3273 break;
3274 case READ_BUFFER:
3275 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3276 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3277 break;
3278 case READ_CAPACITY:
3279 size = READ_CAP_LEN;
3280 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3281 break;
3282 case READ_MEDIA_SERIAL_NUMBER:
3283 case SECURITY_PROTOCOL_IN:
3284 case SECURITY_PROTOCOL_OUT:
3285 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3286 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3287 break;
3288 case SERVICE_ACTION_IN:
3289 case ACCESS_CONTROL_IN:
3290 case ACCESS_CONTROL_OUT:
3291 case EXTENDED_COPY:
3292 case READ_ATTRIBUTE:
3293 case RECEIVE_COPY_RESULTS:
3294 case WRITE_ATTRIBUTE:
3295 size = (cdb[10] << 24) | (cdb[11] << 16) |
3296 (cdb[12] << 8) | cdb[13];
3297 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3298 break;
3299 case RECEIVE_DIAGNOSTIC:
3300 case SEND_DIAGNOSTIC:
3301 size = (cdb[3] << 8) | cdb[4];
3302 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3303 break;
3304 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3305 #if 0
3306 case GPCMD_READ_CD:
3307 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3308 size = (2336 * sectors);
3309 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3310 break;
3311 #endif
3312 case READ_TOC:
3313 size = cdb[8];
3314 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3315 break;
3316 case REQUEST_SENSE:
3317 size = cdb[4];
3318 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3319 break;
3320 case READ_ELEMENT_STATUS:
3321 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3322 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3323 break;
3324 case WRITE_BUFFER:
3325 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3326 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3327 break;
3328 case RESERVE:
3329 case RESERVE_10:
3330 /*
3331 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3332 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3333 */
3334 if (cdb[0] == RESERVE_10)
3335 size = (cdb[7] << 8) | cdb[8];
3336 else
3337 size = cmd->data_length;
3338
3339 /*
3340 * Setup the legacy emulated handler for SPC-2 and
3341 * >= SPC-3 compatible reservation handling (CRH=1)
3342 * Otherwise, we assume the underlying SCSI logic is
3343 * is running in SPC_PASSTHROUGH, and wants reservations
3344 * emulation disabled.
3345 */
3346 cmd->transport_emulate_cdb =
3347 (su_dev->t10_pr.res_type !=
3348 SPC_PASSTHROUGH) ?
3349 core_scsi2_emulate_crh : NULL;
3350 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3351 break;
3352 case RELEASE:
3353 case RELEASE_10:
3354 /*
3355 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3356 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3357 */
3358 if (cdb[0] == RELEASE_10)
3359 size = (cdb[7] << 8) | cdb[8];
3360 else
3361 size = cmd->data_length;
3362
3363 cmd->transport_emulate_cdb =
3364 (su_dev->t10_pr.res_type !=
3365 SPC_PASSTHROUGH) ?
3366 core_scsi2_emulate_crh : NULL;
3367 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3368 break;
3369 case SYNCHRONIZE_CACHE:
3370 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3371 /*
3372 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3373 */
3374 if (cdb[0] == SYNCHRONIZE_CACHE) {
3375 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3376 cmd->t_task.t_task_lba = transport_lba_32(cdb);
3377 } else {
3378 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3379 cmd->t_task.t_task_lba = transport_lba_64(cdb);
3380 }
3381 if (sector_ret)
3382 goto out_unsupported_cdb;
3383
3384 size = transport_get_size(sectors, cdb, cmd);
3385 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3386
3387 /*
3388 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3389 */
3390 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3391 break;
3392 /*
3393 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3394 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3395 */
3396 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3397 /*
3398 * Check to ensure that LBA + Range does not exceed past end of
3399 * device.
3400 */
3401 if (transport_get_sectors(cmd) < 0)
3402 goto out_invalid_cdb_field;
3403 break;
3404 case UNMAP:
3405 size = get_unaligned_be16(&cdb[7]);
3406 passthrough = (dev->transport->transport_type ==
3407 TRANSPORT_PLUGIN_PHBA_PDEV);
3408 /*
3409 * Determine if the received UNMAP used to for direct passthrough
3410 * into Linux/SCSI with struct request via TCM/pSCSI or we are
3411 * signaling the use of internal transport_generic_unmap() emulation
3412 * for UNMAP -> Linux/BLOCK disbard with TCM/IBLOCK and TCM/FILEIO
3413 * subsystem plugin backstores.
3414 */
3415 if (!(passthrough))
3416 cmd->se_cmd_flags |= SCF_EMULATE_SYNC_UNMAP;
3417
3418 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3419 break;
3420 case WRITE_SAME_16:
3421 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3422 if (sector_ret)
3423 goto out_unsupported_cdb;
3424
3425 if (sectors != 0)
3426 size = transport_get_size(sectors, cdb, cmd);
3427 else
3428 size = dev->se_sub_dev->se_dev_attrib.block_size;
3429
3430 cmd->t_task.t_task_lba = get_unaligned_be64(&cdb[2]);
3431 passthrough = (dev->transport->transport_type ==
3432 TRANSPORT_PLUGIN_PHBA_PDEV);
3433 /*
3434 * Determine if the received WRITE_SAME_16 is used to for direct
3435 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3436 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3437 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3438 * TCM/FILEIO subsystem plugin backstores.
3439 */
3440 if (!(passthrough)) {
3441 if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) {
3442 printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA"
3443 " bits not supported for Block Discard"
3444 " Emulation\n");
3445 goto out_invalid_cdb_field;
3446 }
3447 /*
3448 * Currently for the emulated case we only accept
3449 * tpws with the UNMAP=1 bit set.
3450 */
3451 if (!(cdb[1] & 0x08)) {
3452 printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not "
3453 " supported for Block Discard Emulation\n");
3454 goto out_invalid_cdb_field;
3455 }
3456 }
3457 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3458 break;
3459 case ALLOW_MEDIUM_REMOVAL:
3460 case GPCMD_CLOSE_TRACK:
3461 case ERASE:
3462 case INITIALIZE_ELEMENT_STATUS:
3463 case GPCMD_LOAD_UNLOAD:
3464 case REZERO_UNIT:
3465 case SEEK_10:
3466 case GPCMD_SET_SPEED:
3467 case SPACE:
3468 case START_STOP:
3469 case TEST_UNIT_READY:
3470 case VERIFY:
3471 case WRITE_FILEMARKS:
3472 case MOVE_MEDIUM:
3473 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3474 break;
3475 case REPORT_LUNS:
3476 cmd->transport_emulate_cdb =
3477 transport_core_report_lun_response;
3478 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3479 /*
3480 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3481 * See spc4r17 section 5.3
3482 */
3483 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3484 cmd->sam_task_attr = MSG_HEAD_TAG;
3485 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB;
3486 break;
3487 default:
3488 printk(KERN_WARNING "TARGET_CORE[%s]: Unsupported SCSI Opcode"
3489 " 0x%02x, sending CHECK_CONDITION.\n",
3490 cmd->se_tfo->get_fabric_name(), cdb[0]);
3491 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3492 goto out_unsupported_cdb;
3493 }
3494
3495 if (size != cmd->data_length) {
3496 printk(KERN_WARNING "TARGET_CORE[%s]: Expected Transfer Length:"
3497 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3498 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3499 cmd->data_length, size, cdb[0]);
3500
3501 cmd->cmd_spdtl = size;
3502
3503 if (cmd->data_direction == DMA_TO_DEVICE) {
3504 printk(KERN_ERR "Rejecting underflow/overflow"
3505 " WRITE data\n");
3506 goto out_invalid_cdb_field;
3507 }
3508 /*
3509 * Reject READ_* or WRITE_* with overflow/underflow for
3510 * type SCF_SCSI_DATA_SG_IO_CDB.
3511 */
3512 if (!(ret) && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3513 printk(KERN_ERR "Failing OVERFLOW/UNDERFLOW for LBA op"
3514 " CDB on non 512-byte sector setup subsystem"
3515 " plugin: %s\n", dev->transport->name);
3516 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3517 goto out_invalid_cdb_field;
3518 }
3519
3520 if (size > cmd->data_length) {
3521 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3522 cmd->residual_count = (size - cmd->data_length);
3523 } else {
3524 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3525 cmd->residual_count = (cmd->data_length - size);
3526 }
3527 cmd->data_length = size;
3528 }
3529
3530 transport_set_supported_SAM_opcode(cmd);
3531 return ret;
3532
3533 out_unsupported_cdb:
3534 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3535 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3536 return -EINVAL;
3537 out_invalid_cdb_field:
3538 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3539 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3540 return -EINVAL;
3541 }
3542
3543 static inline void transport_release_tasks(struct se_cmd *);
3544
3545 /*
3546 * This function will copy a contiguous *src buffer into a destination
3547 * struct scatterlist array.
3548 */
3549 static void transport_memcpy_write_contig(
3550 struct se_cmd *cmd,
3551 struct scatterlist *sg_d,
3552 unsigned char *src)
3553 {
3554 u32 i = 0, length = 0, total_length = cmd->data_length;
3555 void *dst;
3556
3557 while (total_length) {
3558 length = sg_d[i].length;
3559
3560 if (length > total_length)
3561 length = total_length;
3562
3563 dst = sg_virt(&sg_d[i]);
3564
3565 memcpy(dst, src, length);
3566
3567 if (!(total_length -= length))
3568 return;
3569
3570 src += length;
3571 i++;
3572 }
3573 }
3574
3575 /*
3576 * This function will copy a struct scatterlist array *sg_s into a destination
3577 * contiguous *dst buffer.
3578 */
3579 static void transport_memcpy_read_contig(
3580 struct se_cmd *cmd,
3581 unsigned char *dst,
3582 struct scatterlist *sg_s)
3583 {
3584 u32 i = 0, length = 0, total_length = cmd->data_length;
3585 void *src;
3586
3587 while (total_length) {
3588 length = sg_s[i].length;
3589
3590 if (length > total_length)
3591 length = total_length;
3592
3593 src = sg_virt(&sg_s[i]);
3594
3595 memcpy(dst, src, length);
3596
3597 if (!(total_length -= length))
3598 return;
3599
3600 dst += length;
3601 i++;
3602 }
3603 }
3604
3605 static void transport_memcpy_se_mem_read_contig(
3606 struct se_cmd *cmd,
3607 unsigned char *dst,
3608 struct list_head *se_mem_list)
3609 {
3610 struct se_mem *se_mem;
3611 void *src;
3612 u32 length = 0, total_length = cmd->data_length;
3613
3614 list_for_each_entry(se_mem, se_mem_list, se_list) {
3615 length = se_mem->se_len;
3616
3617 if (length > total_length)
3618 length = total_length;
3619
3620 src = page_address(se_mem->se_page) + se_mem->se_off;
3621
3622 memcpy(dst, src, length);
3623
3624 if (!(total_length -= length))
3625 return;
3626
3627 dst += length;
3628 }
3629 }
3630
3631 /*
3632 * Called from transport_generic_complete_ok() and
3633 * transport_generic_request_failure() to determine which dormant/delayed
3634 * and ordered cmds need to have their tasks added to the execution queue.
3635 */
3636 static void transport_complete_task_attr(struct se_cmd *cmd)
3637 {
3638 struct se_device *dev = cmd->se_dev;
3639 struct se_cmd *cmd_p, *cmd_tmp;
3640 int new_active_tasks = 0;
3641
3642 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3643 atomic_dec(&dev->simple_cmds);
3644 smp_mb__after_atomic_dec();
3645 dev->dev_cur_ordered_id++;
3646 DEBUG_STA("Incremented dev->dev_cur_ordered_id: %u for"
3647 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3648 cmd->se_ordered_id);
3649 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3650 atomic_dec(&dev->dev_hoq_count);
3651 smp_mb__after_atomic_dec();
3652 dev->dev_cur_ordered_id++;
3653 DEBUG_STA("Incremented dev_cur_ordered_id: %u for"
3654 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3655 cmd->se_ordered_id);
3656 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3657 spin_lock(&dev->ordered_cmd_lock);
3658 list_del(&cmd->se_ordered_node);
3659 atomic_dec(&dev->dev_ordered_sync);
3660 smp_mb__after_atomic_dec();
3661 spin_unlock(&dev->ordered_cmd_lock);
3662
3663 dev->dev_cur_ordered_id++;
3664 DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:"
3665 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3666 }
3667 /*
3668 * Process all commands up to the last received
3669 * ORDERED task attribute which requires another blocking
3670 * boundary
3671 */
3672 spin_lock(&dev->delayed_cmd_lock);
3673 list_for_each_entry_safe(cmd_p, cmd_tmp,
3674 &dev->delayed_cmd_list, se_delayed_node) {
3675
3676 list_del(&cmd_p->se_delayed_node);
3677 spin_unlock(&dev->delayed_cmd_lock);
3678
3679 DEBUG_STA("Calling add_tasks() for"
3680 " cmd_p: 0x%02x Task Attr: 0x%02x"
3681 " Dormant -> Active, se_ordered_id: %u\n",
3682 T_TASK(cmd_p)->t_task_cdb[0],
3683 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3684
3685 transport_add_tasks_from_cmd(cmd_p);
3686 new_active_tasks++;
3687
3688 spin_lock(&dev->delayed_cmd_lock);
3689 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3690 break;
3691 }
3692 spin_unlock(&dev->delayed_cmd_lock);
3693 /*
3694 * If new tasks have become active, wake up the transport thread
3695 * to do the processing of the Active tasks.
3696 */
3697 if (new_active_tasks != 0)
3698 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3699 }
3700
3701 static void transport_generic_complete_ok(struct se_cmd *cmd)
3702 {
3703 int reason = 0;
3704 /*
3705 * Check if we need to move delayed/dormant tasks from cmds on the
3706 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3707 * Attribute.
3708 */
3709 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3710 transport_complete_task_attr(cmd);
3711 /*
3712 * Check if we need to retrieve a sense buffer from
3713 * the struct se_cmd in question.
3714 */
3715 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3716 if (transport_get_sense_data(cmd) < 0)
3717 reason = TCM_NON_EXISTENT_LUN;
3718
3719 /*
3720 * Only set when an struct se_task->task_scsi_status returned
3721 * a non GOOD status.
3722 */
3723 if (cmd->scsi_status) {
3724 transport_send_check_condition_and_sense(
3725 cmd, reason, 1);
3726 transport_lun_remove_cmd(cmd);
3727 transport_cmd_check_stop_to_fabric(cmd);
3728 return;
3729 }
3730 }
3731 /*
3732 * Check for a callback, used by amongst other things
3733 * XDWRITE_READ_10 emulation.
3734 */
3735 if (cmd->transport_complete_callback)
3736 cmd->transport_complete_callback(cmd);
3737
3738 switch (cmd->data_direction) {
3739 case DMA_FROM_DEVICE:
3740 spin_lock(&cmd->se_lun->lun_sep_lock);
3741 if (cmd->se_lun->lun_sep) {
3742 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3743 cmd->data_length;
3744 }
3745 spin_unlock(&cmd->se_lun->lun_sep_lock);
3746 /*
3747 * If enabled by TCM fabirc module pre-registered SGL
3748 * memory, perform the memcpy() from the TCM internal
3749 * contigious buffer back to the original SGL.
3750 */
3751 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
3752 transport_memcpy_write_contig(cmd,
3753 cmd->t_task.t_task_pt_sgl,
3754 cmd->t_task.t_task_buf);
3755
3756 cmd->se_tfo->queue_data_in(cmd);
3757 break;
3758 case DMA_TO_DEVICE:
3759 spin_lock(&cmd->se_lun->lun_sep_lock);
3760 if (cmd->se_lun->lun_sep) {
3761 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3762 cmd->data_length;
3763 }
3764 spin_unlock(&cmd->se_lun->lun_sep_lock);
3765 /*
3766 * Check if we need to send READ payload for BIDI-COMMAND
3767 */
3768 if (!list_empty(&cmd->t_task.t_mem_bidi_list)) {
3769 spin_lock(&cmd->se_lun->lun_sep_lock);
3770 if (cmd->se_lun->lun_sep) {
3771 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3772 cmd->data_length;
3773 }
3774 spin_unlock(&cmd->se_lun->lun_sep_lock);
3775 cmd->se_tfo->queue_data_in(cmd);
3776 break;
3777 }
3778 /* Fall through for DMA_TO_DEVICE */
3779 case DMA_NONE:
3780 cmd->se_tfo->queue_status(cmd);
3781 break;
3782 default:
3783 break;
3784 }
3785
3786 transport_lun_remove_cmd(cmd);
3787 transport_cmd_check_stop_to_fabric(cmd);
3788 }
3789
3790 static void transport_free_dev_tasks(struct se_cmd *cmd)
3791 {
3792 struct se_task *task, *task_tmp;
3793 unsigned long flags;
3794
3795 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
3796 list_for_each_entry_safe(task, task_tmp,
3797 &cmd->t_task.t_task_list, t_list) {
3798 if (atomic_read(&task->task_active))
3799 continue;
3800
3801 kfree(task->task_sg_bidi);
3802 kfree(task->task_sg);
3803
3804 list_del(&task->t_list);
3805
3806 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
3807 if (task->se_dev)
3808 task->se_dev->transport->free_task(task);
3809 else
3810 printk(KERN_ERR "task[%u] - task->se_dev is NULL\n",
3811 task->task_no);
3812 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
3813 }
3814 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
3815 }
3816
3817 static inline void transport_free_pages(struct se_cmd *cmd)
3818 {
3819 struct se_mem *se_mem, *se_mem_tmp;
3820 int free_page = 1;
3821
3822 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3823 free_page = 0;
3824 if (cmd->se_dev->transport->do_se_mem_map)
3825 free_page = 0;
3826
3827 if (cmd->t_task.t_task_buf) {
3828 kfree(cmd->t_task.t_task_buf);
3829 cmd->t_task.t_task_buf = NULL;
3830 return;
3831 }
3832
3833 /*
3834 * Caller will handle releasing of struct se_mem.
3835 */
3836 if (cmd->se_cmd_flags & SCF_CMD_PASSTHROUGH_NOALLOC)
3837 return;
3838
3839 list_for_each_entry_safe(se_mem, se_mem_tmp,
3840 &cmd->t_task.t_mem_list, se_list) {
3841 /*
3842 * We only release call __free_page(struct se_mem->se_page) when
3843 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
3844 */
3845 if (free_page)
3846 __free_page(se_mem->se_page);
3847
3848 list_del(&se_mem->se_list);
3849 kmem_cache_free(se_mem_cache, se_mem);
3850 }
3851 cmd->t_task.t_tasks_se_num = 0;
3852
3853 list_for_each_entry_safe(se_mem, se_mem_tmp,
3854 &cmd->t_task.t_mem_bidi_list, se_list) {
3855 /*
3856 * We only release call __free_page(struct se_mem->se_page) when
3857 * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use,
3858 */
3859 if (free_page)
3860 __free_page(se_mem->se_page);
3861
3862 list_del(&se_mem->se_list);
3863 kmem_cache_free(se_mem_cache, se_mem);
3864 }
3865 cmd->t_task.t_tasks_se_bidi_num = 0;
3866 }
3867
3868 static inline void transport_release_tasks(struct se_cmd *cmd)
3869 {
3870 transport_free_dev_tasks(cmd);
3871 }
3872
3873 static inline int transport_dec_and_check(struct se_cmd *cmd)
3874 {
3875 unsigned long flags;
3876
3877 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
3878 if (atomic_read(&cmd->t_task.t_fe_count)) {
3879 if (!(atomic_dec_and_test(&cmd->t_task.t_fe_count))) {
3880 spin_unlock_irqrestore(&cmd->t_task.t_state_lock,
3881 flags);
3882 return 1;
3883 }
3884 }
3885
3886 if (atomic_read(&cmd->t_task.t_se_count)) {
3887 if (!(atomic_dec_and_test(&cmd->t_task.t_se_count))) {
3888 spin_unlock_irqrestore(&cmd->t_task.t_state_lock,
3889 flags);
3890 return 1;
3891 }
3892 }
3893 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
3894
3895 return 0;
3896 }
3897
3898 static void transport_release_fe_cmd(struct se_cmd *cmd)
3899 {
3900 unsigned long flags;
3901
3902 if (transport_dec_and_check(cmd))
3903 return;
3904
3905 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
3906 if (!(atomic_read(&cmd->t_task.transport_dev_active))) {
3907 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
3908 goto free_pages;
3909 }
3910 atomic_set(&cmd->t_task.transport_dev_active, 0);
3911 transport_all_task_dev_remove_state(cmd);
3912 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
3913
3914 transport_release_tasks(cmd);
3915 free_pages:
3916 transport_free_pages(cmd);
3917 transport_free_se_cmd(cmd);
3918 cmd->se_tfo->release_cmd_direct(cmd);
3919 }
3920
3921 static int transport_generic_remove(
3922 struct se_cmd *cmd,
3923 int release_to_pool,
3924 int session_reinstatement)
3925 {
3926 unsigned long flags;
3927
3928 if (transport_dec_and_check(cmd)) {
3929 if (session_reinstatement) {
3930 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
3931 transport_all_task_dev_remove_state(cmd);
3932 spin_unlock_irqrestore(&cmd->t_task.t_state_lock,
3933 flags);
3934 }
3935 return 1;
3936 }
3937
3938 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
3939 if (!(atomic_read(&cmd->t_task.transport_dev_active))) {
3940 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
3941 goto free_pages;
3942 }
3943 atomic_set(&cmd->t_task.transport_dev_active, 0);
3944 transport_all_task_dev_remove_state(cmd);
3945 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
3946
3947 transport_release_tasks(cmd);
3948
3949 free_pages:
3950 transport_free_pages(cmd);
3951
3952 if (release_to_pool) {
3953 transport_release_cmd_to_pool(cmd);
3954 } else {
3955 transport_free_se_cmd(cmd);
3956 cmd->se_tfo->release_cmd_direct(cmd);
3957 }
3958
3959 return 0;
3960 }
3961
3962 /*
3963 * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map
3964 * @cmd: Associated se_cmd descriptor
3965 * @mem: SGL style memory for TCM WRITE / READ
3966 * @sg_mem_num: Number of SGL elements
3967 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3968 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3969 *
3970 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3971 * of parameters.
3972 */
3973 int transport_generic_map_mem_to_cmd(
3974 struct se_cmd *cmd,
3975 struct scatterlist *sgl,
3976 u32 sgl_count,
3977 struct scatterlist *sgl_bidi,
3978 u32 sgl_bidi_count)
3979 {
3980 u32 mapped_sg_count = 0;
3981 int ret;
3982
3983 if (!sgl || !sgl_count)
3984 return 0;
3985
3986 /*
3987 * Convert sgls (sgl, sgl_bidi) to list of se_mems
3988 */
3989 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3990 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3991 /*
3992 * For CDB using TCM struct se_mem linked list scatterlist memory
3993 * processed into a TCM struct se_subsystem_dev, we do the mapping
3994 * from the passed physical memory to struct se_mem->se_page here.
3995 */
3996 ret = transport_map_sg_to_mem(cmd,
3997 &cmd->t_task.t_mem_list, sgl, &mapped_sg_count);
3998 if (ret < 0)
3999 return -ENOMEM;
4000
4001 cmd->t_task.t_tasks_se_num = mapped_sg_count;
4002 /*
4003 * Setup BIDI READ list of struct se_mem elements
4004 */
4005 if (sgl_bidi && sgl_bidi_count) {
4006 mapped_sg_count = 0;
4007 ret = transport_map_sg_to_mem(cmd,
4008 &cmd->t_task.t_mem_bidi_list, sgl_bidi,
4009 &mapped_sg_count);
4010 if (ret < 0)
4011 return -ENOMEM;
4012
4013 cmd->t_task.t_tasks_se_bidi_num = mapped_sg_count;
4014 }
4015 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
4016
4017 } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
4018 if (sgl_bidi || sgl_bidi_count) {
4019 printk(KERN_ERR "BIDI-Commands not supported using "
4020 "SCF_SCSI_CONTROL_NONSG_IO_CDB\n");
4021 return -ENOSYS;
4022 }
4023 /*
4024 * For incoming CDBs using a contiguous buffer internall with TCM,
4025 * save the passed struct scatterlist memory. After TCM storage object
4026 * processing has completed for this struct se_cmd, TCM core will call
4027 * transport_memcpy_[write,read]_contig() as necessary from
4028 * transport_generic_complete_ok() and transport_write_pending() in order
4029 * to copy the TCM buffer to/from the original passed *mem in SGL ->
4030 * struct scatterlist format.
4031 */
4032 cmd->se_cmd_flags |= SCF_PASSTHROUGH_CONTIG_TO_SG;
4033 cmd->t_task.t_task_pt_sgl = sgl;
4034 /* don't need sgl count? We assume it contains cmd->data_length data */
4035 }
4036
4037 return 0;
4038 }
4039 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
4040
4041
4042 static inline long long transport_dev_end_lba(struct se_device *dev)
4043 {
4044 return dev->transport->get_blocks(dev) + 1;
4045 }
4046
4047 static int transport_get_sectors(struct se_cmd *cmd)
4048 {
4049 struct se_device *dev = cmd->se_dev;
4050
4051 cmd->t_task.t_tasks_sectors =
4052 (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
4053 if (!(cmd->t_task.t_tasks_sectors))
4054 cmd->t_task.t_tasks_sectors = 1;
4055
4056 if (dev->transport->get_device_type(dev) != TYPE_DISK)
4057 return 0;
4058
4059 if ((cmd->t_task.t_task_lba + cmd->t_task.t_tasks_sectors) >
4060 transport_dev_end_lba(dev)) {
4061 printk(KERN_ERR "LBA: %llu Sectors: %u exceeds"
4062 " transport_dev_end_lba(): %llu\n",
4063 cmd->t_task.t_task_lba, cmd->t_task.t_tasks_sectors,
4064 transport_dev_end_lba(dev));
4065 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4066 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
4067 return PYX_TRANSPORT_REQ_TOO_MANY_SECTORS;
4068 }
4069
4070 return 0;
4071 }
4072
4073 static int transport_new_cmd_obj(struct se_cmd *cmd)
4074 {
4075 struct se_device *dev = cmd->se_dev;
4076 u32 task_cdbs = 0, rc;
4077
4078 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
4079 task_cdbs++;
4080 cmd->t_task.t_task_cdbs++;
4081 } else {
4082 int set_counts = 1;
4083
4084 /*
4085 * Setup any BIDI READ tasks and memory from
4086 * cmd->t_task.t_mem_bidi_list so the READ struct se_tasks
4087 * are queued first for the non pSCSI passthrough case.
4088 */
4089 if (!list_empty(&cmd->t_task.t_mem_bidi_list) &&
4090 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
4091 rc = transport_generic_get_cdb_count(cmd,
4092 cmd->t_task.t_task_lba,
4093 cmd->t_task.t_tasks_sectors,
4094 DMA_FROM_DEVICE, &cmd->t_task.t_mem_bidi_list,
4095 set_counts);
4096 if (!(rc)) {
4097 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4098 cmd->scsi_sense_reason =
4099 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4100 return PYX_TRANSPORT_LU_COMM_FAILURE;
4101 }
4102 set_counts = 0;
4103 }
4104 /*
4105 * Setup the tasks and memory from cmd->t_task.t_mem_list
4106 * Note for BIDI transfers this will contain the WRITE payload
4107 */
4108 task_cdbs = transport_generic_get_cdb_count(cmd,
4109 cmd->t_task.t_task_lba,
4110 cmd->t_task.t_tasks_sectors,
4111 cmd->data_direction, &cmd->t_task.t_mem_list,
4112 set_counts);
4113 if (!(task_cdbs)) {
4114 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
4115 cmd->scsi_sense_reason =
4116 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
4117 return PYX_TRANSPORT_LU_COMM_FAILURE;
4118 }
4119 cmd->t_task.t_task_cdbs += task_cdbs;
4120
4121 #if 0
4122 printk(KERN_INFO "data_length: %u, LBA: %llu t_tasks_sectors:"
4123 " %u, t_task_cdbs: %u\n", obj_ptr, cmd->data_length,
4124 cmd->t_task.t_task_lba, cmd->t_task.t_tasks_sectors,
4125 cmd->t_task.t_task_cdbs);
4126 #endif
4127 }
4128
4129 atomic_set(&cmd->t_task.t_task_cdbs_left, task_cdbs);
4130 atomic_set(&cmd->t_task.t_task_cdbs_ex_left, task_cdbs);
4131 atomic_set(&cmd->t_task.t_task_cdbs_timeout_left, task_cdbs);
4132 return 0;
4133 }
4134
4135 static int
4136 transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size)
4137 {
4138 unsigned char *buf;
4139 struct se_mem *se_mem;
4140
4141 /*
4142 * If the device uses memory mapping this is enough.
4143 */
4144 if (cmd->se_dev->transport->do_se_mem_map)
4145 return 0;
4146
4147 while (length) {
4148 se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
4149 if (!(se_mem)) {
4150 printk(KERN_ERR "Unable to allocate struct se_mem\n");
4151 goto out;
4152 }
4153
4154 /* #warning FIXME Allocate contigous pages for struct se_mem elements */
4155 se_mem->se_page = alloc_pages(GFP_KERNEL, 0);
4156 if (!(se_mem->se_page)) {
4157 printk(KERN_ERR "alloc_pages() failed\n");
4158 goto out;
4159 }
4160
4161 buf = kmap_atomic(se_mem->se_page, KM_IRQ0);
4162 if (!(buf)) {
4163 printk(KERN_ERR "kmap_atomic() failed\n");
4164 goto out;
4165 }
4166 INIT_LIST_HEAD(&se_mem->se_list);
4167 se_mem->se_len = (length > dma_size) ? dma_size : length;
4168 memset(buf, 0, se_mem->se_len);
4169 kunmap_atomic(buf, KM_IRQ0);
4170
4171 list_add_tail(&se_mem->se_list, &cmd->t_task.t_mem_list);
4172 cmd->t_task.t_tasks_se_num++;
4173
4174 DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)"
4175 " Offset(%u)\n", se_mem->se_page, se_mem->se_len,
4176 se_mem->se_off);
4177
4178 length -= se_mem->se_len;
4179 }
4180
4181 DEBUG_MEM("Allocated total struct se_mem elements(%u)\n",
4182 cmd->t_task.t_tasks_se_num);
4183
4184 return 0;
4185 out:
4186 if (se_mem)
4187 __free_pages(se_mem->se_page, 0);
4188 kmem_cache_free(se_mem_cache, se_mem);
4189 return -ENOMEM;
4190 }
4191
4192 int transport_init_task_sg(
4193 struct se_task *task,
4194 struct se_mem *in_se_mem,
4195 u32 task_offset)
4196 {
4197 struct se_cmd *se_cmd = task->task_se_cmd;
4198 struct se_device *se_dev = se_cmd->se_dev;
4199 struct se_mem *se_mem = in_se_mem;
4200 struct target_core_fabric_ops *tfo = se_cmd->se_tfo;
4201 u32 sg_length, task_size = task->task_size, task_sg_num_padded;
4202
4203 while (task_size != 0) {
4204 DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)"
4205 " se_mem->se_off(%u) task_offset(%u)\n",
4206 se_mem->se_page, se_mem->se_len,
4207 se_mem->se_off, task_offset);
4208
4209 if (task_offset == 0) {
4210 if (task_size >= se_mem->se_len) {
4211 sg_length = se_mem->se_len;
4212
4213 if (!(list_is_last(&se_mem->se_list,
4214 &se_cmd->t_task.t_mem_list)))
4215 se_mem = list_entry(se_mem->se_list.next,
4216 struct se_mem, se_list);
4217 } else {
4218 sg_length = task_size;
4219 task_size -= sg_length;
4220 goto next;
4221 }
4222
4223 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4224 sg_length, task_size);
4225 } else {
4226 if ((se_mem->se_len - task_offset) > task_size) {
4227 sg_length = task_size;
4228 task_size -= sg_length;
4229 goto next;
4230 } else {
4231 sg_length = (se_mem->se_len - task_offset);
4232
4233 if (!(list_is_last(&se_mem->se_list,
4234 &se_cmd->t_task.t_mem_list)))
4235 se_mem = list_entry(se_mem->se_list.next,
4236 struct se_mem, se_list);
4237 }
4238
4239 DEBUG_SC("sg_length(%u) task_size(%u)\n",
4240 sg_length, task_size);
4241
4242 task_offset = 0;
4243 }
4244 task_size -= sg_length;
4245 next:
4246 DEBUG_SC("task[%u] - Reducing task_size to(%u)\n",
4247 task->task_no, task_size);
4248
4249 task->task_sg_num++;
4250 }
4251 /*
4252 * Check if the fabric module driver is requesting that all
4253 * struct se_task->task_sg[] be chained together.. If so,
4254 * then allocate an extra padding SG entry for linking and
4255 * marking the end of the chained SGL.
4256 */
4257 if (tfo->task_sg_chaining) {
4258 task_sg_num_padded = (task->task_sg_num + 1);
4259 task->task_padded_sg = 1;
4260 } else
4261 task_sg_num_padded = task->task_sg_num;
4262
4263 task->task_sg = kzalloc(task_sg_num_padded *
4264 sizeof(struct scatterlist), GFP_KERNEL);
4265 if (!(task->task_sg)) {
4266 printk(KERN_ERR "Unable to allocate memory for"
4267 " task->task_sg\n");
4268 return -ENOMEM;
4269 }
4270 sg_init_table(&task->task_sg[0], task_sg_num_padded);
4271 /*
4272 * Setup task->task_sg_bidi for SCSI READ payload for
4273 * TCM/pSCSI passthrough if present for BIDI-COMMAND
4274 */
4275 if (!list_empty(&se_cmd->t_task.t_mem_bidi_list) &&
4276 (se_dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) {
4277 task->task_sg_bidi = kzalloc(task_sg_num_padded *
4278 sizeof(struct scatterlist), GFP_KERNEL);
4279 if (!(task->task_sg_bidi)) {
4280 kfree(task->task_sg);
4281 task->task_sg = NULL;
4282 printk(KERN_ERR "Unable to allocate memory for"
4283 " task->task_sg_bidi\n");
4284 return -ENOMEM;
4285 }
4286 sg_init_table(&task->task_sg_bidi[0], task_sg_num_padded);
4287 }
4288 /*
4289 * For the chaining case, setup the proper end of SGL for the
4290 * initial submission struct task into struct se_subsystem_api.
4291 * This will be cleared later by transport_do_task_sg_chain()
4292 */
4293 if (task->task_padded_sg) {
4294 sg_mark_end(&task->task_sg[task->task_sg_num - 1]);
4295 /*
4296 * Added the 'if' check before marking end of bi-directional
4297 * scatterlist (which gets created only in case of request
4298 * (RD + WR).
4299 */
4300 if (task->task_sg_bidi)
4301 sg_mark_end(&task->task_sg_bidi[task->task_sg_num - 1]);
4302 }
4303
4304 DEBUG_SC("Successfully allocated task->task_sg_num(%u),"
4305 " task_sg_num_padded(%u)\n", task->task_sg_num,
4306 task_sg_num_padded);
4307
4308 return task->task_sg_num;
4309 }
4310
4311 static inline int transport_set_tasks_sectors_disk(
4312 struct se_task *task,
4313 struct se_device *dev,
4314 unsigned long long lba,
4315 u32 sectors,
4316 int *max_sectors_set)
4317 {
4318 if ((lba + sectors) > transport_dev_end_lba(dev)) {
4319 task->task_sectors = ((transport_dev_end_lba(dev) - lba) + 1);
4320
4321 if (task->task_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
4322 task->task_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
4323 *max_sectors_set = 1;
4324 }
4325 } else {
4326 if (sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
4327 task->task_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
4328 *max_sectors_set = 1;
4329 } else
4330 task->task_sectors = sectors;
4331 }
4332
4333 return 0;
4334 }
4335
4336 static inline int transport_set_tasks_sectors_non_disk(
4337 struct se_task *task,
4338 struct se_device *dev,
4339 unsigned long long lba,
4340 u32 sectors,
4341 int *max_sectors_set)
4342 {
4343 if (sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
4344 task->task_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
4345 *max_sectors_set = 1;
4346 } else
4347 task->task_sectors = sectors;
4348
4349 return 0;
4350 }
4351
4352 static inline int transport_set_tasks_sectors(
4353 struct se_task *task,
4354 struct se_device *dev,
4355 unsigned long long lba,
4356 u32 sectors,
4357 int *max_sectors_set)
4358 {
4359 return (dev->transport->get_device_type(dev) == TYPE_DISK) ?
4360 transport_set_tasks_sectors_disk(task, dev, lba, sectors,
4361 max_sectors_set) :
4362 transport_set_tasks_sectors_non_disk(task, dev, lba, sectors,
4363 max_sectors_set);
4364 }
4365
4366 /*
4367 * Convert a sgl into a linked list of se_mems.
4368 */
4369 static int transport_map_sg_to_mem(
4370 struct se_cmd *cmd,
4371 struct list_head *se_mem_list,
4372 struct scatterlist *sg,
4373 u32 *sg_count)
4374 {
4375 struct se_mem *se_mem;
4376 u32 cmd_size = cmd->data_length;
4377
4378 WARN_ON(!sg);
4379
4380 while (cmd_size) {
4381 /*
4382 * NOTE: it is safe to return -ENOMEM at any time in creating this
4383 * list because transport_free_pages() will eventually be called, and is
4384 * smart enough to deallocate all list items for sg and sg_bidi lists.
4385 */
4386 se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
4387 if (!(se_mem)) {
4388 printk(KERN_ERR "Unable to allocate struct se_mem\n");
4389 return -ENOMEM;
4390 }
4391 INIT_LIST_HEAD(&se_mem->se_list);
4392 DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u"
4393 " sg_page: %p offset: %d length: %d\n", cmd_size,
4394 sg_page(sg), sg->offset, sg->length);
4395
4396 se_mem->se_page = sg_page(sg);
4397 se_mem->se_off = sg->offset;
4398
4399 if (cmd_size > sg->length) {
4400 se_mem->se_len = sg->length;
4401 sg = sg_next(sg);
4402 } else
4403 se_mem->se_len = cmd_size;
4404
4405 cmd_size -= se_mem->se_len;
4406 (*sg_count)++;
4407
4408 DEBUG_MEM("sg_to_mem: sg_count: %u cmd_size: %u\n",
4409 sg_count, cmd_size);
4410 DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n",
4411 se_mem->se_page, se_mem->se_off, se_mem->se_len);
4412
4413 list_add_tail(&se_mem->se_list, se_mem_list);
4414 }
4415
4416 DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments\n", sg_count);
4417
4418 return 0;
4419 }
4420
4421 /* transport_map_mem_to_sg():
4422 *
4423 *
4424 */
4425 int transport_map_mem_to_sg(
4426 struct se_task *task,
4427 struct list_head *se_mem_list,
4428 void *in_mem,
4429 struct se_mem *in_se_mem,
4430 struct se_mem **out_se_mem,
4431 u32 *se_mem_cnt,
4432 u32 *task_offset)
4433 {
4434 struct se_cmd *se_cmd = task->task_se_cmd;
4435 struct se_mem *se_mem = in_se_mem;
4436 struct scatterlist *sg = (struct scatterlist *)in_mem;
4437 u32 task_size = task->task_size, sg_no = 0;
4438
4439 if (!sg) {
4440 printk(KERN_ERR "Unable to locate valid struct"
4441 " scatterlist pointer\n");
4442 return -EINVAL;
4443 }
4444
4445 while (task_size != 0) {
4446 /*
4447 * Setup the contigious array of scatterlists for
4448 * this struct se_task.
4449 */
4450 sg_assign_page(sg, se_mem->se_page);
4451
4452 if (*task_offset == 0) {
4453 sg->offset = se_mem->se_off;
4454
4455 if (task_size >= se_mem->se_len) {
4456 sg->length = se_mem->se_len;
4457
4458 if (!(list_is_last(&se_mem->se_list,
4459 &se_cmd->t_task.t_mem_list))) {
4460 se_mem = list_entry(se_mem->se_list.next,
4461 struct se_mem, se_list);
4462 (*se_mem_cnt)++;
4463 }
4464 } else {
4465 sg->length = task_size;
4466 /*
4467 * Determine if we need to calculate an offset
4468 * into the struct se_mem on the next go around..
4469 */
4470 task_size -= sg->length;
4471 if (!(task_size))
4472 *task_offset = sg->length;
4473
4474 goto next;
4475 }
4476
4477 } else {
4478 sg->offset = (*task_offset + se_mem->se_off);
4479
4480 if ((se_mem->se_len - *task_offset) > task_size) {
4481 sg->length = task_size;
4482 /*
4483 * Determine if we need to calculate an offset
4484 * into the struct se_mem on the next go around..
4485 */
4486 task_size -= sg->length;
4487 if (!(task_size))
4488 *task_offset += sg->length;
4489
4490 goto next;
4491 } else {
4492 sg->length = (se_mem->se_len - *task_offset);
4493
4494 if (!(list_is_last(&se_mem->se_list,
4495 &se_cmd->t_task.t_mem_list))) {
4496 se_mem = list_entry(se_mem->se_list.next,
4497 struct se_mem, se_list);
4498 (*se_mem_cnt)++;
4499 }
4500 }
4501
4502 *task_offset = 0;
4503 }
4504 task_size -= sg->length;
4505 next:
4506 DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing"
4507 " task_size to(%u), task_offset: %u\n", task->task_no, sg_no,
4508 sg_page(sg), sg->length, sg->offset, task_size, *task_offset);
4509
4510 sg_no++;
4511 if (!(task_size))
4512 break;
4513
4514 sg = sg_next(sg);
4515
4516 if (task_size > se_cmd->data_length)
4517 BUG();
4518 }
4519 *out_se_mem = se_mem;
4520
4521 DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)"
4522 " SGs\n", task->task_no, *se_mem_cnt, sg_no);
4523
4524 return 0;
4525 }
4526
4527 /*
4528 * This function can be used by HW target mode drivers to create a linked
4529 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4530 * This is intended to be called during the completion path by TCM Core
4531 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4532 */
4533 void transport_do_task_sg_chain(struct se_cmd *cmd)
4534 {
4535 struct scatterlist *sg_head = NULL, *sg_link = NULL, *sg_first = NULL;
4536 struct scatterlist *sg_head_cur = NULL, *sg_link_cur = NULL;
4537 struct scatterlist *sg, *sg_end = NULL, *sg_end_cur = NULL;
4538 struct se_task *task;
4539 struct target_core_fabric_ops *tfo = cmd->se_tfo;
4540 u32 task_sg_num = 0, sg_count = 0;
4541 int i;
4542
4543 if (tfo->task_sg_chaining == 0) {
4544 printk(KERN_ERR "task_sg_chaining is diabled for fabric module:"
4545 " %s\n", tfo->get_fabric_name());
4546 dump_stack();
4547 return;
4548 }
4549 /*
4550 * Walk the struct se_task list and setup scatterlist chains
4551 * for each contiguosly allocated struct se_task->task_sg[].
4552 */
4553 list_for_each_entry(task, &cmd->t_task.t_task_list, t_list) {
4554 if (!(task->task_sg) || !(task->task_padded_sg))
4555 continue;
4556
4557 if (sg_head && sg_link) {
4558 sg_head_cur = &task->task_sg[0];
4559 sg_link_cur = &task->task_sg[task->task_sg_num];
4560 /*
4561 * Either add chain or mark end of scatterlist
4562 */
4563 if (!(list_is_last(&task->t_list,
4564 &cmd->t_task.t_task_list))) {
4565 /*
4566 * Clear existing SGL termination bit set in
4567 * transport_init_task_sg(), see sg_mark_end()
4568 */
4569 sg_end_cur = &task->task_sg[task->task_sg_num - 1];
4570 sg_end_cur->page_link &= ~0x02;
4571
4572 sg_chain(sg_head, task_sg_num, sg_head_cur);
4573 sg_count += task->task_sg_num;
4574 task_sg_num = (task->task_sg_num + 1);
4575 } else {
4576 sg_chain(sg_head, task_sg_num, sg_head_cur);
4577 sg_count += task->task_sg_num;
4578 task_sg_num = task->task_sg_num;
4579 }
4580
4581 sg_head = sg_head_cur;
4582 sg_link = sg_link_cur;
4583 continue;
4584 }
4585 sg_head = sg_first = &task->task_sg[0];
4586 sg_link = &task->task_sg[task->task_sg_num];
4587 /*
4588 * Check for single task..
4589 */
4590 if (!(list_is_last(&task->t_list, &cmd->t_task.t_task_list))) {
4591 /*
4592 * Clear existing SGL termination bit set in
4593 * transport_init_task_sg(), see sg_mark_end()
4594 */
4595 sg_end = &task->task_sg[task->task_sg_num - 1];
4596 sg_end->page_link &= ~0x02;
4597 sg_count += task->task_sg_num;
4598 task_sg_num = (task->task_sg_num + 1);
4599 } else {
4600 sg_count += task->task_sg_num;
4601 task_sg_num = task->task_sg_num;
4602 }
4603 }
4604 /*
4605 * Setup the starting pointer and total t_tasks_sg_linked_no including
4606 * padding SGs for linking and to mark the end.
4607 */
4608 cmd->t_task.t_tasks_sg_chained = sg_first;
4609 cmd->t_task.t_tasks_sg_chained_no = sg_count;
4610
4611 DEBUG_CMD_M("Setup cmd: %p cmd->t_task.t_tasks_sg_chained: %p and"
4612 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_task.t_tasks_sg_chained,
4613 cmd->t_task.t_tasks_sg_chained_no);
4614
4615 for_each_sg(cmd->t_task.t_tasks_sg_chained, sg,
4616 cmd->t_task.t_tasks_sg_chained_no, i) {
4617
4618 DEBUG_CMD_M("SG[%d]: %p page: %p length: %d offset: %d\n",
4619 i, sg, sg_page(sg), sg->length, sg->offset);
4620 if (sg_is_chain(sg))
4621 DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg);
4622 if (sg_is_last(sg))
4623 DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg);
4624 }
4625 }
4626 EXPORT_SYMBOL(transport_do_task_sg_chain);
4627
4628 static int transport_do_se_mem_map(
4629 struct se_device *dev,
4630 struct se_task *task,
4631 struct list_head *se_mem_list,
4632 void *in_mem,
4633 struct se_mem *in_se_mem,
4634 struct se_mem **out_se_mem,
4635 u32 *se_mem_cnt,
4636 u32 *task_offset_in)
4637 {
4638 u32 task_offset = *task_offset_in;
4639 int ret = 0;
4640 /*
4641 * se_subsystem_api_t->do_se_mem_map is used when internal allocation
4642 * has been done by the transport plugin.
4643 */
4644 if (dev->transport->do_se_mem_map) {
4645 ret = dev->transport->do_se_mem_map(task, se_mem_list,
4646 in_mem, in_se_mem, out_se_mem, se_mem_cnt,
4647 task_offset_in);
4648 if (ret == 0)
4649 task->task_se_cmd->t_task.t_tasks_se_num += *se_mem_cnt;
4650
4651 return ret;
4652 }
4653
4654 BUG_ON(list_empty(se_mem_list));
4655 /*
4656 * This is the normal path for all normal non BIDI and BIDI-COMMAND
4657 * WRITE payloads.. If we need to do BIDI READ passthrough for
4658 * TCM/pSCSI the first call to transport_do_se_mem_map ->
4659 * transport_init_task_sg() -> transport_map_mem_to_sg() will do the
4660 * allocation for task->task_sg_bidi, and the subsequent call to
4661 * transport_do_se_mem_map() from transport_generic_get_cdb_count()
4662 */
4663 if (!(task->task_sg_bidi)) {
4664 /*
4665 * Assume default that transport plugin speaks preallocated
4666 * scatterlists.
4667 */
4668 ret = transport_init_task_sg(task, in_se_mem, task_offset);
4669 if (ret <= 0)
4670 return ret;
4671 /*
4672 * struct se_task->task_sg now contains the struct scatterlist array.
4673 */
4674 return transport_map_mem_to_sg(task, se_mem_list, task->task_sg,
4675 in_se_mem, out_se_mem, se_mem_cnt,
4676 task_offset_in);
4677 }
4678 /*
4679 * Handle the se_mem_list -> struct task->task_sg_bidi
4680 * memory map for the extra BIDI READ payload
4681 */
4682 return transport_map_mem_to_sg(task, se_mem_list, task->task_sg_bidi,
4683 in_se_mem, out_se_mem, se_mem_cnt,
4684 task_offset_in);
4685 }
4686
4687 static u32 transport_generic_get_cdb_count(
4688 struct se_cmd *cmd,
4689 unsigned long long lba,
4690 u32 sectors,
4691 enum dma_data_direction data_direction,
4692 struct list_head *mem_list,
4693 int set_counts)
4694 {
4695 unsigned char *cdb = NULL;
4696 struct se_task *task;
4697 struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
4698 struct se_mem *se_mem_bidi = NULL, *se_mem_bidi_lout = NULL;
4699 struct se_device *dev = cmd->se_dev;
4700 int max_sectors_set = 0, ret;
4701 u32 task_offset_in = 0, se_mem_cnt = 0, se_mem_bidi_cnt = 0, task_cdbs = 0;
4702
4703 if (!mem_list) {
4704 printk(KERN_ERR "mem_list is NULL in transport_generic_get"
4705 "_cdb_count()\n");
4706 return 0;
4707 }
4708 /*
4709 * While using RAMDISK_DR backstores is the only case where
4710 * mem_list will ever be empty at this point.
4711 */
4712 if (!(list_empty(mem_list)))
4713 se_mem = list_first_entry(mem_list, struct se_mem, se_list);
4714 /*
4715 * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to
4716 * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation
4717 */
4718 if (!list_empty(&cmd->t_task.t_mem_bidi_list) &&
4719 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV))
4720 se_mem_bidi = list_first_entry(&cmd->t_task.t_mem_bidi_list,
4721 struct se_mem, se_list);
4722
4723 while (sectors) {
4724 DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n",
4725 cmd->se_tfo->get_task_tag(cmd), lba, sectors,
4726 transport_dev_end_lba(dev));
4727
4728 task = transport_generic_get_task(cmd, data_direction);
4729 if (!(task))
4730 goto out;
4731
4732 transport_set_tasks_sectors(task, dev, lba, sectors,
4733 &max_sectors_set);
4734
4735 task->task_lba = lba;
4736 lba += task->task_sectors;
4737 sectors -= task->task_sectors;
4738 task->task_size = (task->task_sectors *
4739 dev->se_sub_dev->se_dev_attrib.block_size);
4740
4741 cdb = dev->transport->get_cdb(task);
4742 if ((cdb)) {
4743 memcpy(cdb, cmd->t_task.t_task_cdb,
4744 scsi_command_size(cmd->t_task.t_task_cdb));
4745 cmd->transport_split_cdb(task->task_lba,
4746 &task->task_sectors, cdb);
4747 }
4748
4749 /*
4750 * Perform the SE OBJ plugin and/or Transport plugin specific
4751 * mapping for cmd->t_task.t_mem_list. And setup the
4752 * task->task_sg and if necessary task->task_sg_bidi
4753 */
4754 ret = transport_do_se_mem_map(dev, task, mem_list,
4755 NULL, se_mem, &se_mem_lout, &se_mem_cnt,
4756 &task_offset_in);
4757 if (ret < 0)
4758 goto out;
4759
4760 se_mem = se_mem_lout;
4761 /*
4762 * Setup the cmd->t_task.t_mem_bidi_list -> task->task_sg_bidi
4763 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI
4764 *
4765 * Note that the first call to transport_do_se_mem_map() above will
4766 * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map()
4767 * -> transport_init_task_sg(), and the second here will do the
4768 * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI.
4769 */
4770 if (task->task_sg_bidi != NULL) {
4771 ret = transport_do_se_mem_map(dev, task,
4772 &cmd->t_task.t_mem_bidi_list, NULL,
4773 se_mem_bidi, &se_mem_bidi_lout, &se_mem_bidi_cnt,
4774 &task_offset_in);
4775 if (ret < 0)
4776 goto out;
4777
4778 se_mem_bidi = se_mem_bidi_lout;
4779 }
4780 task_cdbs++;
4781
4782 DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n",
4783 task_cdbs, task->task_sg_num);
4784
4785 if (max_sectors_set) {
4786 max_sectors_set = 0;
4787 continue;
4788 }
4789
4790 if (!sectors)
4791 break;
4792 }
4793
4794 if (set_counts) {
4795 atomic_inc(&cmd->t_task.t_fe_count);
4796 atomic_inc(&cmd->t_task.t_se_count);
4797 }
4798
4799 DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n",
4800 cmd->se_tfo->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE)
4801 ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs);
4802
4803 return task_cdbs;
4804 out:
4805 return 0;
4806 }
4807
4808 static int
4809 transport_map_control_cmd_to_task(struct se_cmd *cmd)
4810 {
4811 struct se_device *dev = cmd->se_dev;
4812 unsigned char *cdb;
4813 struct se_task *task;
4814 int ret;
4815
4816 task = transport_generic_get_task(cmd, cmd->data_direction);
4817 if (!task)
4818 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
4819
4820 cdb = dev->transport->get_cdb(task);
4821 if (cdb)
4822 memcpy(cdb, cmd->t_task.t_task_cdb,
4823 scsi_command_size(cmd->t_task.t_task_cdb));
4824
4825 task->task_size = cmd->data_length;
4826 task->task_sg_num =
4827 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) ? 1 : 0;
4828
4829 atomic_inc(&cmd->t_task.t_fe_count);
4830 atomic_inc(&cmd->t_task.t_se_count);
4831
4832 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
4833 struct se_mem *se_mem = NULL, *se_mem_lout = NULL;
4834 u32 se_mem_cnt = 0, task_offset = 0;
4835
4836 if (!list_empty(&cmd->t_task.t_mem_list))
4837 se_mem = list_first_entry(&cmd->t_task.t_mem_list,
4838 struct se_mem, se_list);
4839
4840 ret = transport_do_se_mem_map(dev, task,
4841 &cmd->t_task.t_mem_list, NULL, se_mem,
4842 &se_mem_lout, &se_mem_cnt, &task_offset);
4843 if (ret < 0)
4844 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
4845
4846 if (dev->transport->map_task_SG)
4847 return dev->transport->map_task_SG(task);
4848 return 0;
4849 } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) {
4850 if (dev->transport->map_task_non_SG)
4851 return dev->transport->map_task_non_SG(task);
4852 return 0;
4853 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4854 if (dev->transport->cdb_none)
4855 return dev->transport->cdb_none(task);
4856 return 0;
4857 } else {
4858 BUG();
4859 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
4860 }
4861 }
4862
4863 /* transport_generic_new_cmd(): Called from transport_processing_thread()
4864 *
4865 * Allocate storage transport resources from a set of values predefined
4866 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4867 * Any non zero return here is treated as an "out of resource' op here.
4868 */
4869 /*
4870 * Generate struct se_task(s) and/or their payloads for this CDB.
4871 */
4872 static int transport_generic_new_cmd(struct se_cmd *cmd)
4873 {
4874 struct se_portal_group *se_tpg;
4875 struct se_task *task;
4876 struct se_device *dev = cmd->se_dev;
4877 int ret = 0;
4878
4879 /*
4880 * Determine is the TCM fabric module has already allocated physical
4881 * memory, and is directly calling transport_generic_map_mem_to_cmd()
4882 * to setup beforehand the linked list of physical memory at
4883 * cmd->t_task.t_mem_list of struct se_mem->se_page
4884 */
4885 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) {
4886 ret = transport_allocate_resources(cmd);
4887 if (ret < 0)
4888 return ret;
4889 }
4890
4891 ret = transport_get_sectors(cmd);
4892 if (ret < 0)
4893 return ret;
4894
4895 ret = transport_new_cmd_obj(cmd);
4896 if (ret < 0)
4897 return ret;
4898
4899 /*
4900 * Determine if the calling TCM fabric module is talking to
4901 * Linux/NET via kernel sockets and needs to allocate a
4902 * struct iovec array to complete the struct se_cmd
4903 */
4904 se_tpg = cmd->se_lun->lun_sep->sep_tpg;
4905 if (se_tpg->se_tpg_tfo->alloc_cmd_iovecs != NULL) {
4906 ret = se_tpg->se_tpg_tfo->alloc_cmd_iovecs(cmd);
4907 if (ret < 0)
4908 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
4909 }
4910
4911 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4912 list_for_each_entry(task, &cmd->t_task.t_task_list, t_list) {
4913 if (atomic_read(&task->task_sent))
4914 continue;
4915 if (!dev->transport->map_task_SG)
4916 continue;
4917
4918 ret = dev->transport->map_task_SG(task);
4919 if (ret < 0)
4920 return ret;
4921 }
4922 } else {
4923 ret = transport_map_control_cmd_to_task(cmd);
4924 if (ret < 0)
4925 return ret;
4926 }
4927
4928 /*
4929 * For WRITEs, let the iSCSI Target RX Thread know its buffer is ready..
4930 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4931 * will be added to the struct se_device execution queue after its WRITE
4932 * data has arrived. (ie: It gets handled by the transport processing
4933 * thread a second time)
4934 */
4935 if (cmd->data_direction == DMA_TO_DEVICE) {
4936 transport_add_tasks_to_state_queue(cmd);
4937 return transport_generic_write_pending(cmd);
4938 }
4939 /*
4940 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4941 * to the execution queue.
4942 */
4943 transport_execute_tasks(cmd);
4944 return 0;
4945 }
4946
4947 /* transport_generic_process_write():
4948 *
4949 *
4950 */
4951 void transport_generic_process_write(struct se_cmd *cmd)
4952 {
4953 #if 0
4954 /*
4955 * Copy SCSI Presented DTL sector(s) from received buffers allocated to
4956 * original EDTL
4957 */
4958 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
4959 if (!cmd->t_task.t_tasks_se_num) {
4960 unsigned char *dst, *buf =
4961 (unsigned char *)cmd->t_task.t_task_buf;
4962
4963 dst = kzalloc(cmd->cmd_spdtl), GFP_KERNEL);
4964 if (!(dst)) {
4965 printk(KERN_ERR "Unable to allocate memory for"
4966 " WRITE underflow\n");
4967 transport_generic_request_failure(cmd, NULL,
4968 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
4969 return;
4970 }
4971 memcpy(dst, buf, cmd->cmd_spdtl);
4972
4973 kfree(cmd->t_task.t_task_buf);
4974 cmd->t_task.t_task_buf = dst;
4975 } else {
4976 struct scatterlist *sg =
4977 (struct scatterlist *sg)cmd->t_task.t_task_buf;
4978 struct scatterlist *orig_sg;
4979
4980 orig_sg = kzalloc(sizeof(struct scatterlist) *
4981 cmd->t_task.t_tasks_se_num,
4982 GFP_KERNEL))) {
4983 if (!(orig_sg)) {
4984 printk(KERN_ERR "Unable to allocate memory"
4985 " for WRITE underflow\n");
4986 transport_generic_request_failure(cmd, NULL,
4987 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
4988 return;
4989 }
4990
4991 memcpy(orig_sg, cmd->t_task.t_task_buf,
4992 sizeof(struct scatterlist) *
4993 cmd->t_task.t_tasks_se_num);
4994
4995 cmd->data_length = cmd->cmd_spdtl;
4996 /*
4997 * FIXME, clear out original struct se_task and state
4998 * information.
4999 */
5000 if (transport_generic_new_cmd(cmd) < 0) {
5001 transport_generic_request_failure(cmd, NULL,
5002 PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1);
5003 kfree(orig_sg);
5004 return;
5005 }
5006
5007 transport_memcpy_write_sg(cmd, orig_sg);
5008 }
5009 }
5010 #endif
5011 transport_execute_tasks(cmd);
5012 }
5013 EXPORT_SYMBOL(transport_generic_process_write);
5014
5015 /* transport_generic_write_pending():
5016 *
5017 *
5018 */
5019 static int transport_generic_write_pending(struct se_cmd *cmd)
5020 {
5021 unsigned long flags;
5022 int ret;
5023
5024 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
5025 cmd->t_state = TRANSPORT_WRITE_PENDING;
5026 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
5027 /*
5028 * For the TCM control CDBs using a contiguous buffer, do the memcpy
5029 * from the passed Linux/SCSI struct scatterlist located at
5030 * se_cmd->t_task.t_task_pt_buf to the contiguous buffer at
5031 * se_cmd->t_task.t_task_buf.
5032 */
5033 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG)
5034 transport_memcpy_read_contig(cmd,
5035 cmd->t_task.t_task_buf,
5036 cmd->t_task.t_task_pt_sgl);
5037 /*
5038 * Clear the se_cmd for WRITE_PENDING status in order to set
5039 * cmd->t_task.t_transport_active=0 so that transport_generic_handle_data
5040 * can be called from HW target mode interrupt code. This is safe
5041 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
5042 * because the se_cmd->se_lun pointer is not being cleared.
5043 */
5044 transport_cmd_check_stop(cmd, 1, 0);
5045
5046 /*
5047 * Call the fabric write_pending function here to let the
5048 * frontend know that WRITE buffers are ready.
5049 */
5050 ret = cmd->se_tfo->write_pending(cmd);
5051 if (ret < 0)
5052 return ret;
5053
5054 return PYX_TRANSPORT_WRITE_PENDING;
5055 }
5056
5057 /* transport_release_cmd_to_pool():
5058 *
5059 *
5060 */
5061 void transport_release_cmd_to_pool(struct se_cmd *cmd)
5062 {
5063 BUG_ON(!cmd->se_tfo);
5064
5065 transport_free_se_cmd(cmd);
5066 cmd->se_tfo->release_cmd_to_pool(cmd);
5067 }
5068 EXPORT_SYMBOL(transport_release_cmd_to_pool);
5069
5070 /* transport_generic_free_cmd():
5071 *
5072 * Called from processing frontend to release storage engine resources
5073 */
5074 void transport_generic_free_cmd(
5075 struct se_cmd *cmd,
5076 int wait_for_tasks,
5077 int release_to_pool,
5078 int session_reinstatement)
5079 {
5080 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
5081 transport_release_cmd_to_pool(cmd);
5082 else {
5083 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
5084
5085 if (cmd->se_lun) {
5086 #if 0
5087 printk(KERN_INFO "cmd: %p ITT: 0x%08x contains"
5088 " cmd->se_lun\n", cmd,
5089 cmd->se_tfo->get_task_tag(cmd));
5090 #endif
5091 transport_lun_remove_cmd(cmd);
5092 }
5093
5094 if (wait_for_tasks && cmd->transport_wait_for_tasks)
5095 cmd->transport_wait_for_tasks(cmd, 0, 0);
5096
5097 transport_free_dev_tasks(cmd);
5098
5099 transport_generic_remove(cmd, release_to_pool,
5100 session_reinstatement);
5101 }
5102 }
5103 EXPORT_SYMBOL(transport_generic_free_cmd);
5104
5105 static void transport_nop_wait_for_tasks(
5106 struct se_cmd *cmd,
5107 int remove_cmd,
5108 int session_reinstatement)
5109 {
5110 return;
5111 }
5112
5113 /* transport_lun_wait_for_tasks():
5114 *
5115 * Called from ConfigFS context to stop the passed struct se_cmd to allow
5116 * an struct se_lun to be successfully shutdown.
5117 */
5118 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
5119 {
5120 unsigned long flags;
5121 int ret;
5122 /*
5123 * If the frontend has already requested this struct se_cmd to
5124 * be stopped, we can safely ignore this struct se_cmd.
5125 */
5126 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
5127 if (atomic_read(&cmd->t_task.t_transport_stop)) {
5128 atomic_set(&cmd->t_task.transport_lun_stop, 0);
5129 DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop =="
5130 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
5131 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
5132 transport_cmd_check_stop(cmd, 1, 0);
5133 return -EPERM;
5134 }
5135 atomic_set(&cmd->t_task.transport_lun_fe_stop, 1);
5136 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
5137
5138 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
5139
5140 ret = transport_stop_tasks_for_cmd(cmd);
5141
5142 DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:"
5143 " %d\n", cmd, cmd->t_task.t_task_cdbs, ret);
5144 if (!ret) {
5145 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
5146 cmd->se_tfo->get_task_tag(cmd));
5147 wait_for_completion(&cmd->t_task.transport_lun_stop_comp);
5148 DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
5149 cmd->se_tfo->get_task_tag(cmd));
5150 }
5151 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
5152
5153 return 0;
5154 }
5155
5156 /* #define DEBUG_CLEAR_LUN */
5157 #ifdef DEBUG_CLEAR_LUN
5158 #define DEBUG_CLEAR_L(x...) printk(KERN_INFO x)
5159 #else
5160 #define DEBUG_CLEAR_L(x...)
5161 #endif
5162
5163 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
5164 {
5165 struct se_cmd *cmd = NULL;
5166 unsigned long lun_flags, cmd_flags;
5167 /*
5168 * Do exception processing and return CHECK_CONDITION status to the
5169 * Initiator Port.
5170 */
5171 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5172 while (!list_empty(&lun->lun_cmd_list)) {
5173 cmd = list_first_entry(&lun->lun_cmd_list,
5174 struct se_cmd, se_lun_node);
5175 list_del(&cmd->se_lun_node);
5176
5177 atomic_set(&cmd->t_task.transport_lun_active, 0);
5178 /*
5179 * This will notify iscsi_target_transport.c:
5180 * transport_cmd_check_stop() that a LUN shutdown is in
5181 * progress for the iscsi_cmd_t.
5182 */
5183 spin_lock(&cmd->t_task.t_state_lock);
5184 DEBUG_CLEAR_L("SE_LUN[%d] - Setting cmd->t_task.transport"
5185 "_lun_stop for ITT: 0x%08x\n",
5186 cmd->se_lun->unpacked_lun,
5187 cmd->se_tfo->get_task_tag(cmd));
5188 atomic_set(&cmd->t_task.transport_lun_stop, 1);
5189 spin_unlock(&cmd->t_task.t_state_lock);
5190
5191 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
5192
5193 if (!(cmd->se_lun)) {
5194 printk(KERN_ERR "ITT: 0x%08x, [i,t]_state: %u/%u\n",
5195 cmd->se_tfo->get_task_tag(cmd),
5196 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
5197 BUG();
5198 }
5199 /*
5200 * If the Storage engine still owns the iscsi_cmd_t, determine
5201 * and/or stop its context.
5202 */
5203 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport"
5204 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
5205 cmd->se_tfo->get_task_tag(cmd));
5206
5207 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
5208 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5209 continue;
5210 }
5211
5212 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
5213 "_wait_for_tasks(): SUCCESS\n",
5214 cmd->se_lun->unpacked_lun,
5215 cmd->se_tfo->get_task_tag(cmd));
5216
5217 spin_lock_irqsave(&cmd->t_task.t_state_lock, cmd_flags);
5218 if (!(atomic_read(&cmd->t_task.transport_dev_active))) {
5219 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, cmd_flags);
5220 goto check_cond;
5221 }
5222 atomic_set(&cmd->t_task.transport_dev_active, 0);
5223 transport_all_task_dev_remove_state(cmd);
5224 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, cmd_flags);
5225
5226 transport_free_dev_tasks(cmd);
5227 /*
5228 * The Storage engine stopped this struct se_cmd before it was
5229 * send to the fabric frontend for delivery back to the
5230 * Initiator Node. Return this SCSI CDB back with an
5231 * CHECK_CONDITION status.
5232 */
5233 check_cond:
5234 transport_send_check_condition_and_sense(cmd,
5235 TCM_NON_EXISTENT_LUN, 0);
5236 /*
5237 * If the fabric frontend is waiting for this iscsi_cmd_t to
5238 * be released, notify the waiting thread now that LU has
5239 * finished accessing it.
5240 */
5241 spin_lock_irqsave(&cmd->t_task.t_state_lock, cmd_flags);
5242 if (atomic_read(&cmd->t_task.transport_lun_fe_stop)) {
5243 DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for"
5244 " struct se_cmd: %p ITT: 0x%08x\n",
5245 lun->unpacked_lun,
5246 cmd, cmd->se_tfo->get_task_tag(cmd));
5247
5248 spin_unlock_irqrestore(&cmd->t_task.t_state_lock,
5249 cmd_flags);
5250 transport_cmd_check_stop(cmd, 1, 0);
5251 complete(&cmd->t_task.transport_lun_fe_stop_comp);
5252 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5253 continue;
5254 }
5255 DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
5256 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
5257
5258 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, cmd_flags);
5259 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5260 }
5261 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
5262 }
5263
5264 static int transport_clear_lun_thread(void *p)
5265 {
5266 struct se_lun *lun = (struct se_lun *)p;
5267
5268 __transport_clear_lun_from_sessions(lun);
5269 complete(&lun->lun_shutdown_comp);
5270
5271 return 0;
5272 }
5273
5274 int transport_clear_lun_from_sessions(struct se_lun *lun)
5275 {
5276 struct task_struct *kt;
5277
5278 kt = kthread_run(transport_clear_lun_thread, lun,
5279 "tcm_cl_%u", lun->unpacked_lun);
5280 if (IS_ERR(kt)) {
5281 printk(KERN_ERR "Unable to start clear_lun thread\n");
5282 return PTR_ERR(kt);
5283 }
5284 wait_for_completion(&lun->lun_shutdown_comp);
5285
5286 return 0;
5287 }
5288
5289 /* transport_generic_wait_for_tasks():
5290 *
5291 * Called from frontend or passthrough context to wait for storage engine
5292 * to pause and/or release frontend generated struct se_cmd.
5293 */
5294 static void transport_generic_wait_for_tasks(
5295 struct se_cmd *cmd,
5296 int remove_cmd,
5297 int session_reinstatement)
5298 {
5299 unsigned long flags;
5300
5301 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
5302 return;
5303
5304 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
5305 /*
5306 * If we are already stopped due to an external event (ie: LUN shutdown)
5307 * sleep until the connection can have the passed struct se_cmd back.
5308 * The cmd->t_task.transport_lun_stopped_sem will be upped by
5309 * transport_clear_lun_from_sessions() once the ConfigFS context caller
5310 * has completed its operation on the struct se_cmd.
5311 */
5312 if (atomic_read(&cmd->t_task.transport_lun_stop)) {
5313
5314 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping"
5315 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
5316 "_stop_comp); for ITT: 0x%08x\n",
5317 cmd->se_tfo->get_task_tag(cmd));
5318 /*
5319 * There is a special case for WRITES where a FE exception +
5320 * LUN shutdown means ConfigFS context is still sleeping on
5321 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
5322 * We go ahead and up transport_lun_stop_comp just to be sure
5323 * here.
5324 */
5325 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
5326 complete(&cmd->t_task.transport_lun_stop_comp);
5327 wait_for_completion(&cmd->t_task.transport_lun_fe_stop_comp);
5328 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
5329
5330 transport_all_task_dev_remove_state(cmd);
5331 /*
5332 * At this point, the frontend who was the originator of this
5333 * struct se_cmd, now owns the structure and can be released through
5334 * normal means below.
5335 */
5336 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped"
5337 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
5338 "stop_comp); for ITT: 0x%08x\n",
5339 cmd->se_tfo->get_task_tag(cmd));
5340
5341 atomic_set(&cmd->t_task.transport_lun_stop, 0);
5342 }
5343 if (!atomic_read(&cmd->t_task.t_transport_active) ||
5344 atomic_read(&cmd->t_task.t_transport_aborted))
5345 goto remove;
5346
5347 atomic_set(&cmd->t_task.t_transport_stop, 1);
5348
5349 DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x"
5350 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
5351 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
5352 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
5353 cmd->deferred_t_state);
5354
5355 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
5356
5357 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
5358
5359 wait_for_completion(&cmd->t_task.t_transport_stop_comp);
5360
5361 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
5362 atomic_set(&cmd->t_task.t_transport_active, 0);
5363 atomic_set(&cmd->t_task.t_transport_stop, 0);
5364
5365 DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion("
5366 "&cmd->t_task.t_transport_stop_comp) for ITT: 0x%08x\n",
5367 cmd->se_tfo->get_task_tag(cmd));
5368 remove:
5369 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
5370 if (!remove_cmd)
5371 return;
5372
5373 transport_generic_free_cmd(cmd, 0, 0, session_reinstatement);
5374 }
5375
5376 static int transport_get_sense_codes(
5377 struct se_cmd *cmd,
5378 u8 *asc,
5379 u8 *ascq)
5380 {
5381 *asc = cmd->scsi_asc;
5382 *ascq = cmd->scsi_ascq;
5383
5384 return 0;
5385 }
5386
5387 static int transport_set_sense_codes(
5388 struct se_cmd *cmd,
5389 u8 asc,
5390 u8 ascq)
5391 {
5392 cmd->scsi_asc = asc;
5393 cmd->scsi_ascq = ascq;
5394
5395 return 0;
5396 }
5397
5398 int transport_send_check_condition_and_sense(
5399 struct se_cmd *cmd,
5400 u8 reason,
5401 int from_transport)
5402 {
5403 unsigned char *buffer = cmd->sense_buffer;
5404 unsigned long flags;
5405 int offset;
5406 u8 asc = 0, ascq = 0;
5407
5408 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
5409 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
5410 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
5411 return 0;
5412 }
5413 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
5414 spin_unlock_irqrestore(&cmd->t_task.t_state_lock, flags);
5415
5416 if (!reason && from_transport)
5417 goto after_reason;
5418
5419 if (!from_transport)
5420 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
5421 /*
5422 * Data Segment and SenseLength of the fabric response PDU.
5423 *
5424 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
5425 * from include/scsi/scsi_cmnd.h
5426 */
5427 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
5428 TRANSPORT_SENSE_BUFFER);
5429 /*
5430 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
5431 * SENSE KEY values from include/scsi/scsi.h
5432 */
5433 switch (reason) {
5434 case TCM_NON_EXISTENT_LUN:
5435 case TCM_UNSUPPORTED_SCSI_OPCODE:
5436 case TCM_SECTOR_COUNT_TOO_MANY:
5437 /* CURRENT ERROR */
5438 buffer[offset] = 0x70;
5439 /* ILLEGAL REQUEST */
5440 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5441 /* INVALID COMMAND OPERATION CODE */
5442 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
5443 break;
5444 case TCM_UNKNOWN_MODE_PAGE:
5445 /* CURRENT ERROR */
5446 buffer[offset] = 0x70;
5447 /* ILLEGAL REQUEST */
5448 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5449 /* INVALID FIELD IN CDB */
5450 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
5451 break;
5452 case TCM_CHECK_CONDITION_ABORT_CMD:
5453 /* CURRENT ERROR */
5454 buffer[offset] = 0x70;
5455 /* ABORTED COMMAND */
5456 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5457 /* BUS DEVICE RESET FUNCTION OCCURRED */
5458 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
5459 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
5460 break;
5461 case TCM_INCORRECT_AMOUNT_OF_DATA:
5462 /* CURRENT ERROR */
5463 buffer[offset] = 0x70;
5464 /* ABORTED COMMAND */
5465 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5466 /* WRITE ERROR */
5467 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
5468 /* NOT ENOUGH UNSOLICITED DATA */
5469 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
5470 break;
5471 case TCM_INVALID_CDB_FIELD:
5472 /* CURRENT ERROR */
5473 buffer[offset] = 0x70;
5474 /* ABORTED COMMAND */
5475 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5476 /* INVALID FIELD IN CDB */
5477 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
5478 break;
5479 case TCM_INVALID_PARAMETER_LIST:
5480 /* CURRENT ERROR */
5481 buffer[offset] = 0x70;
5482 /* ABORTED COMMAND */
5483 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5484 /* INVALID FIELD IN PARAMETER LIST */
5485 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
5486 break;
5487 case TCM_UNEXPECTED_UNSOLICITED_DATA:
5488 /* CURRENT ERROR */
5489 buffer[offset] = 0x70;
5490 /* ABORTED COMMAND */
5491 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5492 /* WRITE ERROR */
5493 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
5494 /* UNEXPECTED_UNSOLICITED_DATA */
5495 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
5496 break;
5497 case TCM_SERVICE_CRC_ERROR:
5498 /* CURRENT ERROR */
5499 buffer[offset] = 0x70;
5500 /* ABORTED COMMAND */
5501 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5502 /* PROTOCOL SERVICE CRC ERROR */
5503 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
5504 /* N/A */
5505 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
5506 break;
5507 case TCM_SNACK_REJECTED:
5508 /* CURRENT ERROR */
5509 buffer[offset] = 0x70;
5510 /* ABORTED COMMAND */
5511 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
5512 /* READ ERROR */
5513 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
5514 /* FAILED RETRANSMISSION REQUEST */
5515 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
5516 break;
5517 case TCM_WRITE_PROTECTED:
5518 /* CURRENT ERROR */
5519 buffer[offset] = 0x70;
5520 /* DATA PROTECT */
5521 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
5522 /* WRITE PROTECTED */
5523 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
5524 break;
5525 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
5526 /* CURRENT ERROR */
5527 buffer[offset] = 0x70;
5528 /* UNIT ATTENTION */
5529 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
5530 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
5531 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
5532 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
5533 break;
5534 case TCM_CHECK_CONDITION_NOT_READY:
5535 /* CURRENT ERROR */
5536 buffer[offset] = 0x70;
5537 /* Not Ready */
5538 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
5539 transport_get_sense_codes(cmd, &asc, &ascq);
5540 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
5541 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
5542 break;
5543 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
5544 default:
5545 /* CURRENT ERROR */
5546 buffer[offset] = 0x70;
5547 /* ILLEGAL REQUEST */
5548 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
5549 /* LOGICAL UNIT COMMUNICATION FAILURE */
5550 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
5551 break;
5552 }
5553 /*
5554 * This code uses linux/include/scsi/scsi.h SAM status codes!
5555 */
5556 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
5557 /*
5558 * Automatically padded, this value is encoded in the fabric's
5559 * data_length response PDU containing the SCSI defined sense data.
5560 */
5561 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
5562
5563 after_reason:
5564 cmd->se_tfo->queue_status(cmd);
5565 return 0;
5566 }
5567 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
5568
5569 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
5570 {
5571 int ret = 0;
5572
5573 if (atomic_read(&cmd->t_task.t_transport_aborted) != 0) {
5574 if (!(send_status) ||
5575 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
5576 return 1;
5577 #if 0
5578 printk(KERN_INFO "Sending delayed SAM_STAT_TASK_ABORTED"
5579 " status for CDB: 0x%02x ITT: 0x%08x\n",
5580 cmd->t_task.t_task_cdb[0],
5581 cmd->se_tfo->get_task_tag(cmd));
5582 #endif
5583 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
5584 cmd->se_tfo->queue_status(cmd);
5585 ret = 1;
5586 }
5587 return ret;
5588 }
5589 EXPORT_SYMBOL(transport_check_aborted_status);
5590
5591 void transport_send_task_abort(struct se_cmd *cmd)
5592 {
5593 /*
5594 * If there are still expected incoming fabric WRITEs, we wait
5595 * until until they have completed before sending a TASK_ABORTED
5596 * response. This response with TASK_ABORTED status will be
5597 * queued back to fabric module by transport_check_aborted_status().
5598 */
5599 if (cmd->data_direction == DMA_TO_DEVICE) {
5600 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
5601 atomic_inc(&cmd->t_task.t_transport_aborted);
5602 smp_mb__after_atomic_inc();
5603 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
5604 transport_new_cmd_failure(cmd);
5605 return;
5606 }
5607 }
5608 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
5609 #if 0
5610 printk(KERN_INFO "Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
5611 " ITT: 0x%08x\n", cmd->t_task.t_task_cdb[0],
5612 cmd->se_tfo->get_task_tag(cmd));
5613 #endif
5614 cmd->se_tfo->queue_status(cmd);
5615 }
5616
5617 /* transport_generic_do_tmr():
5618 *
5619 *
5620 */
5621 int transport_generic_do_tmr(struct se_cmd *cmd)
5622 {
5623 struct se_cmd *ref_cmd;
5624 struct se_device *dev = cmd->se_dev;
5625 struct se_tmr_req *tmr = cmd->se_tmr_req;
5626 int ret;
5627
5628 switch (tmr->function) {
5629 case TMR_ABORT_TASK:
5630 ref_cmd = tmr->ref_cmd;
5631 tmr->response = TMR_FUNCTION_REJECTED;
5632 break;
5633 case TMR_ABORT_TASK_SET:
5634 case TMR_CLEAR_ACA:
5635 case TMR_CLEAR_TASK_SET:
5636 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
5637 break;
5638 case TMR_LUN_RESET:
5639 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
5640 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
5641 TMR_FUNCTION_REJECTED;
5642 break;
5643 case TMR_TARGET_WARM_RESET:
5644 tmr->response = TMR_FUNCTION_REJECTED;
5645 break;
5646 case TMR_TARGET_COLD_RESET:
5647 tmr->response = TMR_FUNCTION_REJECTED;
5648 break;
5649 default:
5650 printk(KERN_ERR "Uknown TMR function: 0x%02x.\n",
5651 tmr->function);
5652 tmr->response = TMR_FUNCTION_REJECTED;
5653 break;
5654 }
5655
5656 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
5657 cmd->se_tfo->queue_tm_rsp(cmd);
5658
5659 transport_cmd_check_stop(cmd, 2, 0);
5660 return 0;
5661 }
5662
5663 /*
5664 * Called with spin_lock_irq(&dev->execute_task_lock); held
5665 *
5666 */
5667 static struct se_task *
5668 transport_get_task_from_state_list(struct se_device *dev)
5669 {
5670 struct se_task *task;
5671
5672 if (list_empty(&dev->state_task_list))
5673 return NULL;
5674
5675 list_for_each_entry(task, &dev->state_task_list, t_state_list)
5676 break;
5677
5678 list_del(&task->t_state_list);
5679 atomic_set(&task->task_state_active, 0);
5680
5681 return task;
5682 }
5683
5684 static void transport_processing_shutdown(struct se_device *dev)
5685 {
5686 struct se_cmd *cmd;
5687 struct se_task *task;
5688 unsigned long flags;
5689 /*
5690 * Empty the struct se_device's struct se_task state list.
5691 */
5692 spin_lock_irqsave(&dev->execute_task_lock, flags);
5693 while ((task = transport_get_task_from_state_list(dev))) {
5694 if (!task->task_se_cmd) {
5695 printk(KERN_ERR "task->task_se_cmd is NULL!\n");
5696 continue;
5697 }
5698 cmd = task->task_se_cmd;
5699
5700 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5701
5702 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
5703
5704 DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x,"
5705 " i_state/def_i_state: %d/%d, t_state/def_t_state:"
5706 " %d/%d cdb: 0x%02x\n", cmd, task,
5707 cmd->se_tfo->get_task_tag(cmd), cmd->cmd_sn,
5708 cmd->se_tfo->get_cmd_state(cmd), cmd->deferred_i_state,
5709 cmd->t_state, cmd->deferred_t_state,
5710 cmd->t_task.t_task_cdb[0]);
5711 DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:"
5712 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5713 " t_transport_stop: %d t_transport_sent: %d\n",
5714 cmd->se_tfo->get_task_tag(cmd),
5715 cmd->t_task.t_task_cdbs,
5716 atomic_read(&cmd->t_task.t_task_cdbs_left),
5717 atomic_read(&cmd->t_task.t_task_cdbs_sent),
5718 atomic_read(&cmd->t_task.t_transport_active),
5719 atomic_read(&cmd->t_task.t_transport_stop),
5720 atomic_read(&cmd->t_task.t_transport_sent));
5721
5722 if (atomic_read(&task->task_active)) {
5723 atomic_set(&task->task_stop, 1);
5724 spin_unlock_irqrestore(
5725 &cmd->t_task.t_state_lock, flags);
5726
5727 DEBUG_DO("Waiting for task: %p to shutdown for dev:"
5728 " %p\n", task, dev);
5729 wait_for_completion(&task->task_stop_comp);
5730 DEBUG_DO("Completed task: %p shutdown for dev: %p\n",
5731 task, dev);
5732
5733 spin_lock_irqsave(&cmd->t_task.t_state_lock, flags);
5734 atomic_dec(&cmd->t_task.t_task_cdbs_left);
5735
5736 atomic_set(&task->task_active, 0);
5737 atomic_set(&task->task_stop, 0);
5738 } else {
5739 if (atomic_read(&task->task_execute_queue) != 0)
5740 transport_remove_task_from_execute_queue(task, dev);
5741 }
5742 __transport_stop_task_timer(task, &flags);
5743
5744 if (!(atomic_dec_and_test(&cmd->t_task.t_task_cdbs_ex_left))) {
5745 spin_unlock_irqrestore(
5746 &cmd->t_task.t_state_lock, flags);
5747
5748 DEBUG_DO("Skipping task: %p, dev: %p for"
5749 " t_task_cdbs_ex_left: %d\n", task, dev,
5750 atomic_read(&cmd->t_task.t_task_cdbs_ex_left));
5751
5752 spin_lock_irqsave(&dev->execute_task_lock, flags);
5753 continue;
5754 }
5755
5756 if (atomic_read(&cmd->t_task.t_transport_active)) {
5757 DEBUG_DO("got t_transport_active = 1 for task: %p, dev:"
5758 " %p\n", task, dev);
5759
5760 if (atomic_read(&cmd->t_task.t_fe_count)) {
5761 spin_unlock_irqrestore(
5762 &cmd->t_task.t_state_lock, flags);
5763 transport_send_check_condition_and_sense(
5764 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5765 0);
5766 transport_remove_cmd_from_queue(cmd,
5767 &cmd->se_dev->dev_queue_obj);
5768
5769 transport_lun_remove_cmd(cmd);
5770 transport_cmd_check_stop(cmd, 1, 0);
5771 } else {
5772 spin_unlock_irqrestore(
5773 &cmd->t_task.t_state_lock, flags);
5774
5775 transport_remove_cmd_from_queue(cmd,
5776 &cmd->se_dev->dev_queue_obj);
5777
5778 transport_lun_remove_cmd(cmd);
5779
5780 if (transport_cmd_check_stop(cmd, 1, 0))
5781 transport_generic_remove(cmd, 0, 0);
5782 }
5783
5784 spin_lock_irqsave(&dev->execute_task_lock, flags);
5785 continue;
5786 }
5787 DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n",
5788 task, dev);
5789
5790 if (atomic_read(&cmd->t_task.t_fe_count)) {
5791 spin_unlock_irqrestore(
5792 &cmd->t_task.t_state_lock, flags);
5793 transport_send_check_condition_and_sense(cmd,
5794 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5795 transport_remove_cmd_from_queue(cmd,
5796 &cmd->se_dev->dev_queue_obj);
5797
5798 transport_lun_remove_cmd(cmd);
5799 transport_cmd_check_stop(cmd, 1, 0);
5800 } else {
5801 spin_unlock_irqrestore(
5802 &cmd->t_task.t_state_lock, flags);
5803
5804 transport_remove_cmd_from_queue(cmd,
5805 &cmd->se_dev->dev_queue_obj);
5806 transport_lun_remove_cmd(cmd);
5807
5808 if (transport_cmd_check_stop(cmd, 1, 0))
5809 transport_generic_remove(cmd, 0, 0);
5810 }
5811
5812 spin_lock_irqsave(&dev->execute_task_lock, flags);
5813 }
5814 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5815 /*
5816 * Empty the struct se_device's struct se_cmd list.
5817 */
5818 while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
5819
5820 DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n",
5821 cmd, cmd->t_state);
5822
5823 if (atomic_read(&cmd->t_task.t_fe_count)) {
5824 transport_send_check_condition_and_sense(cmd,
5825 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5826
5827 transport_lun_remove_cmd(cmd);
5828 transport_cmd_check_stop(cmd, 1, 0);
5829 } else {
5830 transport_lun_remove_cmd(cmd);
5831 if (transport_cmd_check_stop(cmd, 1, 0))
5832 transport_generic_remove(cmd, 0, 0);
5833 }
5834 }
5835 }
5836
5837 /* transport_processing_thread():
5838 *
5839 *
5840 */
5841 static int transport_processing_thread(void *param)
5842 {
5843 int ret;
5844 struct se_cmd *cmd;
5845 struct se_device *dev = (struct se_device *) param;
5846
5847 set_user_nice(current, -20);
5848
5849 while (!kthread_should_stop()) {
5850 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5851 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
5852 kthread_should_stop());
5853 if (ret < 0)
5854 goto out;
5855
5856 spin_lock_irq(&dev->dev_status_lock);
5857 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5858 spin_unlock_irq(&dev->dev_status_lock);
5859 transport_processing_shutdown(dev);
5860 continue;
5861 }
5862 spin_unlock_irq(&dev->dev_status_lock);
5863
5864 get_cmd:
5865 __transport_execute_tasks(dev);
5866
5867 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5868 if (!cmd)
5869 continue;
5870
5871 switch (cmd->t_state) {
5872 case TRANSPORT_NEW_CMD_MAP:
5873 if (!(cmd->se_tfo->new_cmd_map)) {
5874 printk(KERN_ERR "cmd->se_tfo->new_cmd_map is"
5875 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5876 BUG();
5877 }
5878 ret = cmd->se_tfo->new_cmd_map(cmd);
5879 if (ret < 0) {
5880 cmd->transport_error_status = ret;
5881 transport_generic_request_failure(cmd, NULL,
5882 0, (cmd->data_direction !=
5883 DMA_TO_DEVICE));
5884 break;
5885 }
5886 /* Fall through */
5887 case TRANSPORT_NEW_CMD:
5888 ret = transport_generic_new_cmd(cmd);
5889 if (ret < 0) {
5890 cmd->transport_error_status = ret;
5891 transport_generic_request_failure(cmd, NULL,
5892 0, (cmd->data_direction !=
5893 DMA_TO_DEVICE));
5894 }
5895 break;
5896 case TRANSPORT_PROCESS_WRITE:
5897 transport_generic_process_write(cmd);
5898 break;
5899 case TRANSPORT_COMPLETE_OK:
5900 transport_stop_all_task_timers(cmd);
5901 transport_generic_complete_ok(cmd);
5902 break;
5903 case TRANSPORT_REMOVE:
5904 transport_generic_remove(cmd, 1, 0);
5905 break;
5906 case TRANSPORT_FREE_CMD_INTR:
5907 transport_generic_free_cmd(cmd, 0, 1, 0);
5908 break;
5909 case TRANSPORT_PROCESS_TMR:
5910 transport_generic_do_tmr(cmd);
5911 break;
5912 case TRANSPORT_COMPLETE_FAILURE:
5913 transport_generic_request_failure(cmd, NULL, 1, 1);
5914 break;
5915 case TRANSPORT_COMPLETE_TIMEOUT:
5916 transport_stop_all_task_timers(cmd);
5917 transport_generic_request_timeout(cmd);
5918 break;
5919 default:
5920 printk(KERN_ERR "Unknown t_state: %d deferred_t_state:"
5921 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5922 " %u\n", cmd->t_state, cmd->deferred_t_state,
5923 cmd->se_tfo->get_task_tag(cmd),
5924 cmd->se_tfo->get_cmd_state(cmd),
5925 cmd->se_lun->unpacked_lun);
5926 BUG();
5927 }
5928
5929 goto get_cmd;
5930 }
5931
5932 out:
5933 transport_release_all_cmds(dev);
5934 dev->process_thread = NULL;
5935 return 0;
5936 }
Linux kernel - Deliverables
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