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