projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
target: Fix write payload exception handling with ->new_cmd_map
[linux-block.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 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>
c66ac9db
NB		 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>
e66ecd50 45#include <scsi/scsi_tcq.h>
c66ac9db
NB		 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
e3d6f909 61static int sub_api_initialized;
c66ac9db
NB		 62
63static struct kmem_cache *se_cmd_cache;
64static struct kmem_cache *se_sess_cache;
65struct kmem_cache *se_tmr_req_cache;
66struct kmem_cache *se_ua_cache;
c66ac9db
NB		 67struct kmem_cache *t10_pr_reg_cache;
68struct kmem_cache *t10_alua_lu_gp_cache;
69struct kmem_cache *t10_alua_lu_gp_mem_cache;
70struct kmem_cache *t10_alua_tg_pt_gp_cache;
71struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
72
73/* Used for transport_dev_get_map_*() */
74typedef int (*map_func_t)(struct se_task *, u32);
75
76static int transport_generic_write_pending(struct se_cmd *);
5951146d 77static int transport_processing_thread(void *param);
c66ac9db
NB		 78static int __transport_execute_tasks(struct se_device *dev);
79static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a
NB		 80static int transport_complete_qf(struct se_cmd *cmd);
81static void transport_handle_queue_full(struct se_cmd *cmd,
82 struct se_device *dev, int (*qf_callback)(struct se_cmd *));
c66ac9db
NB		 83static void transport_direct_request_timeout(struct se_cmd *cmd);
84static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 85static u32 transport_allocate_tasks(struct se_cmd *cmd,
ec98f782 86 unsigned long long starting_lba,
c66ac9db 87 enum dma_data_direction data_direction,
ec98f782 88 struct scatterlist *sgl, unsigned int nents);
05d1c7c0 89static int transport_generic_get_mem(struct se_cmd *cmd);
c66ac9db 90static int transport_generic_remove(struct se_cmd *cmd,
35462975 91 int session_reinstatement);
c66ac9db
NB		 92static void transport_release_fe_cmd(struct se_cmd *cmd);
93static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
94 struct se_queue_obj *qobj);
95static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
96static void transport_stop_all_task_timers(struct se_cmd *cmd);
97
e3d6f909 98int init_se_kmem_caches(void)
c66ac9db 99{
c66ac9db
NB		 100 se_cmd_cache = kmem_cache_create("se_cmd_cache",
101 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 102 if (!se_cmd_cache) {
103 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 104 goto out;
105 }
106 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
107 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
108 0, NULL);
6708bb27
AG		 109 if (!se_tmr_req_cache) {
110 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db
NB		 111 " failed\n");
112 goto out;
113 }
114 se_sess_cache = kmem_cache_create("se_sess_cache",
115 sizeof(struct se_session), __alignof__(struct se_session),
116 0, NULL);
6708bb27
AG		 117 if (!se_sess_cache) {
118 pr_err("kmem_cache_create() for struct se_session"
c66ac9db
NB		 119 " failed\n");
120 goto out;
121 }
122 se_ua_cache = kmem_cache_create("se_ua_cache",
123 sizeof(struct se_ua), __alignof__(struct se_ua),
124 0, NULL);
6708bb27
AG		 125 if (!se_ua_cache) {
126 pr_err("kmem_cache_create() for struct se_ua failed\n");
c66ac9db
NB		 127 goto out;
128 }
c66ac9db
NB		 129 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
130 sizeof(struct t10_pr_registration),
131 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 132 if (!t10_pr_reg_cache) {
133 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db
NB		 134 " failed\n");
135 goto out;
136 }
137 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
138 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
139 0, NULL);
6708bb27
AG		 140 if (!t10_alua_lu_gp_cache) {
141 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db
NB		 142 " failed\n");
143 goto out;
144 }
145 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
146 sizeof(struct t10_alua_lu_gp_member),
147 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 148 if (!t10_alua_lu_gp_mem_cache) {
149 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db
NB		 150 "cache failed\n");
151 goto out;
152 }
153 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
154 sizeof(struct t10_alua_tg_pt_gp),
155 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 156 if (!t10_alua_tg_pt_gp_cache) {
157 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 158 "cache failed\n");
159 goto out;
160 }
161 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
162 "t10_alua_tg_pt_gp_mem_cache",
163 sizeof(struct t10_alua_tg_pt_gp_member),
164 __alignof__(struct t10_alua_tg_pt_gp_member),
165 0, NULL);
6708bb27
AG		 166 if (!t10_alua_tg_pt_gp_mem_cache) {
167 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 168 "mem_t failed\n");
169 goto out;
170 }
171
c66ac9db
NB		 172 return 0;
173out:
174 if (se_cmd_cache)
175 kmem_cache_destroy(se_cmd_cache);
176 if (se_tmr_req_cache)
177 kmem_cache_destroy(se_tmr_req_cache);
178 if (se_sess_cache)
179 kmem_cache_destroy(se_sess_cache);
180 if (se_ua_cache)
181 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 182 if (t10_pr_reg_cache)
183 kmem_cache_destroy(t10_pr_reg_cache);
184 if (t10_alua_lu_gp_cache)
185 kmem_cache_destroy(t10_alua_lu_gp_cache);
186 if (t10_alua_lu_gp_mem_cache)
187 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
188 if (t10_alua_tg_pt_gp_cache)
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 if (t10_alua_tg_pt_gp_mem_cache)
191 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
e3d6f909 192 return -ENOMEM;
c66ac9db
NB		 193}
194
e3d6f909 195void release_se_kmem_caches(void)
c66ac9db 196{
c66ac9db
NB		 197 kmem_cache_destroy(se_cmd_cache);
198 kmem_cache_destroy(se_tmr_req_cache);
199 kmem_cache_destroy(se_sess_cache);
200 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 201 kmem_cache_destroy(t10_pr_reg_cache);
202 kmem_cache_destroy(t10_alua_lu_gp_cache);
203 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
205 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 206}
207
e3d6f909
AG		 208/* This code ensures unique mib indexes are handed out. */
209static DEFINE_SPINLOCK(scsi_mib_index_lock);
210static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 211
212/*
213 * Allocate a new row index for the entry type specified
214 */
215u32 scsi_get_new_index(scsi_index_t type)
216{
217 u32 new_index;
218
e3d6f909 219 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 220
e3d6f909
AG		 221 spin_lock(&scsi_mib_index_lock);
222 new_index = ++scsi_mib_index[type];
223 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 224
225 return new_index;
226}
227
c66ac9db
NB		 228void transport_init_queue_obj(struct se_queue_obj *qobj)
229{
230 atomic_set(&qobj->queue_cnt, 0);
231 INIT_LIST_HEAD(&qobj->qobj_list);
232 init_waitqueue_head(&qobj->thread_wq);
233 spin_lock_init(&qobj->cmd_queue_lock);
234}
235EXPORT_SYMBOL(transport_init_queue_obj);
236
237static int transport_subsystem_reqmods(void)
238{
239 int ret;
240
241 ret = request_module("target_core_iblock");
242 if (ret != 0)
6708bb27 243 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 244
245 ret = request_module("target_core_file");
246 if (ret != 0)
6708bb27 247 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 248
249 ret = request_module("target_core_pscsi");
250 if (ret != 0)
6708bb27 251 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 252
253 ret = request_module("target_core_stgt");
254 if (ret != 0)
6708bb27 255 pr_err("Unable to load target_core_stgt\n");
c66ac9db
NB		 256
257 return 0;
258}
259
260int transport_subsystem_check_init(void)
261{
e3d6f909
AG		 262 int ret;
263
264 if (sub_api_initialized)
c66ac9db
NB		 265 return 0;
266 /*
267 * Request the loading of known TCM subsystem plugins..
268 */
e3d6f909
AG		 269 ret = transport_subsystem_reqmods();
270 if (ret < 0)
271 return ret;
c66ac9db 272
e3d6f909 273 sub_api_initialized = 1;
c66ac9db
NB		 274 return 0;
275}
276
277struct se_session *transport_init_session(void)
278{
279 struct se_session *se_sess;
280
281 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 282 if (!se_sess) {
283 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 284 " se_sess_cache\n");
285 return ERR_PTR(-ENOMEM);
286 }
287 INIT_LIST_HEAD(&se_sess->sess_list);
288 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 289
290 return se_sess;
291}
292EXPORT_SYMBOL(transport_init_session);
293
294/*
295 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
296 */
297void __transport_register_session(
298 struct se_portal_group *se_tpg,
299 struct se_node_acl *se_nacl,
300 struct se_session *se_sess,
301 void *fabric_sess_ptr)
302{
303 unsigned char buf[PR_REG_ISID_LEN];
304
305 se_sess->se_tpg = se_tpg;
306 se_sess->fabric_sess_ptr = fabric_sess_ptr;
307 /*
308 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
309 *
310 * Only set for struct se_session's that will actually be moving I/O.
311 * eg: *NOT* discovery sessions.
312 */
313 if (se_nacl) {
314 /*
315 * If the fabric module supports an ISID based TransportID,
316 * save this value in binary from the fabric I_T Nexus now.
317 */
e3d6f909 318 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 319 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 320 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 321 &buf[0], PR_REG_ISID_LEN);
322 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
323 }
324 spin_lock_irq(&se_nacl->nacl_sess_lock);
325 /*
326 * The se_nacl->nacl_sess pointer will be set to the
327 * last active I_T Nexus for each struct se_node_acl.
328 */
329 se_nacl->nacl_sess = se_sess;
330
331 list_add_tail(&se_sess->sess_acl_list,
332 &se_nacl->acl_sess_list);
333 spin_unlock_irq(&se_nacl->nacl_sess_lock);
334 }
335 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
336
6708bb27 337 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 338 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 339}
340EXPORT_SYMBOL(__transport_register_session);
341
342void transport_register_session(
343 struct se_portal_group *se_tpg,
344 struct se_node_acl *se_nacl,
345 struct se_session *se_sess,
346 void *fabric_sess_ptr)
347{
348 spin_lock_bh(&se_tpg->session_lock);
349 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
350 spin_unlock_bh(&se_tpg->session_lock);
351}
352EXPORT_SYMBOL(transport_register_session);
353
354void transport_deregister_session_configfs(struct se_session *se_sess)
355{
356 struct se_node_acl *se_nacl;
23388864 357 unsigned long flags;
c66ac9db
NB		 358 /*
359 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
360 */
361 se_nacl = se_sess->se_node_acl;
6708bb27 362 if (se_nacl) {
23388864 363 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 364 list_del(&se_sess->sess_acl_list);
365 /*
366 * If the session list is empty, then clear the pointer.
367 * Otherwise, set the struct se_session pointer from the tail
368 * element of the per struct se_node_acl active session list.
369 */
370 if (list_empty(&se_nacl->acl_sess_list))
371 se_nacl->nacl_sess = NULL;
372 else {
373 se_nacl->nacl_sess = container_of(
374 se_nacl->acl_sess_list.prev,
375 struct se_session, sess_acl_list);
376 }
23388864 377 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 378 }
379}
380EXPORT_SYMBOL(transport_deregister_session_configfs);
381
382void transport_free_session(struct se_session *se_sess)
383{
384 kmem_cache_free(se_sess_cache, se_sess);
385}
386EXPORT_SYMBOL(transport_free_session);
387
388void transport_deregister_session(struct se_session *se_sess)
389{
390 struct se_portal_group *se_tpg = se_sess->se_tpg;
391 struct se_node_acl *se_nacl;
392
6708bb27 393 if (!se_tpg) {
c66ac9db
NB		 394 transport_free_session(se_sess);
395 return;
396 }
c66ac9db
NB		 397
398 spin_lock_bh(&se_tpg->session_lock);
399 list_del(&se_sess->sess_list);
400 se_sess->se_tpg = NULL;
401 se_sess->fabric_sess_ptr = NULL;
402 spin_unlock_bh(&se_tpg->session_lock);
403
404 /*
405 * Determine if we need to do extra work for this initiator node's
406 * struct se_node_acl if it had been previously dynamically generated.
407 */
408 se_nacl = se_sess->se_node_acl;
6708bb27 409 if (se_nacl) {
c66ac9db
NB		 410 spin_lock_bh(&se_tpg->acl_node_lock);
411 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 412 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
413 se_tpg)) {
c66ac9db
NB		 414 list_del(&se_nacl->acl_list);
415 se_tpg->num_node_acls--;
416 spin_unlock_bh(&se_tpg->acl_node_lock);
417
418 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 419 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 420 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db
NB		 421 se_nacl);
422 spin_lock_bh(&se_tpg->acl_node_lock);
423 }
424 }
425 spin_unlock_bh(&se_tpg->acl_node_lock);
426 }
427
428 transport_free_session(se_sess);
429
6708bb27 430 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 431 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 432}
433EXPORT_SYMBOL(transport_deregister_session);
434
435/*
a1d8b49a 436 * Called with cmd->t_state_lock held.
c66ac9db
NB		 437 */
438static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
439{
440 struct se_device *dev;
441 struct se_task *task;
442 unsigned long flags;
443
a1d8b49a 444 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db 445 dev = task->se_dev;
6708bb27 446 if (!dev)
c66ac9db
NB		 447 continue;
448
449 if (atomic_read(&task->task_active))
450 continue;
451
6708bb27 452 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 453 continue;
454
455 spin_lock_irqsave(&dev->execute_task_lock, flags);
456 list_del(&task->t_state_list);
6708bb27
AG		 457 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
458 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 459 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
460
461 atomic_set(&task->task_state_active, 0);
a1d8b49a 462 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 463 }
464}
465
466/* transport_cmd_check_stop():
467 *
468 * 'transport_off = 1' determines if t_transport_active should be cleared.
469 * 'transport_off = 2' determines if task_dev_state should be removed.
470 *
471 * A non-zero u8 t_state sets cmd->t_state.
472 * Returns 1 when command is stopped, else 0.
473 */
474static int transport_cmd_check_stop(
475 struct se_cmd *cmd,
476 int transport_off,
477 u8 t_state)
478{
479 unsigned long flags;
480
a1d8b49a 481 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 482 /*
483 * Determine if IOCTL context caller in requesting the stopping of this
484 * command for LUN shutdown purposes.
485 */
a1d8b49a 486 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 487 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 488 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 489 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 490
491 cmd->deferred_t_state = cmd->t_state;
492 cmd->t_state = TRANSPORT_DEFERRED_CMD;
a1d8b49a 493 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 494 if (transport_off == 2)
495 transport_all_task_dev_remove_state(cmd);
a1d8b49a 496 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 497
a1d8b49a 498 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 499 return 1;
500 }
501 /*
502 * Determine if frontend context caller is requesting the stopping of
e3d6f909 503 * this command for frontend exceptions.
c66ac9db 504 */
a1d8b49a 505 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 506 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 507 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 508 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 509
510 cmd->deferred_t_state = cmd->t_state;
511 cmd->t_state = TRANSPORT_DEFERRED_CMD;
512 if (transport_off == 2)
513 transport_all_task_dev_remove_state(cmd);
514
515 /*
516 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
517 * to FE.
518 */
519 if (transport_off == 2)
520 cmd->se_lun = NULL;
a1d8b49a 521 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 522
a1d8b49a 523 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 524 return 1;
525 }
526 if (transport_off) {
a1d8b49a 527 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 528 if (transport_off == 2) {
529 transport_all_task_dev_remove_state(cmd);
530 /*
531 * Clear struct se_cmd->se_lun before the transport_off == 2
532 * handoff to fabric module.
533 */
534 cmd->se_lun = NULL;
535 /*
536 * Some fabric modules like tcm_loop can release
25985edc 537 * their internally allocated I/O reference now and
c66ac9db
NB		 538 * struct se_cmd now.
539 */
e3d6f909 540 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 541 spin_unlock_irqrestore(
a1d8b49a 542 &cmd->t_state_lock, flags);
c66ac9db 543
e3d6f909 544 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 545 return 1;
546 }
547 }
a1d8b49a 548 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 549
550 return 0;
551 } else if (t_state)
552 cmd->t_state = t_state;
a1d8b49a 553 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 554
555 return 0;
556}
557
558static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
559{
560 return transport_cmd_check_stop(cmd, 2, 0);
561}
562
563static void transport_lun_remove_cmd(struct se_cmd *cmd)
564{
e3d6f909 565 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 566 unsigned long flags;
567
568 if (!lun)
569 return;
570
a1d8b49a 571 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 572 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 573 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 574 goto check_lun;
575 }
a1d8b49a 576 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 577 transport_all_task_dev_remove_state(cmd);
a1d8b49a 578 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 579
c66ac9db
NB		 580
581check_lun:
582 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 583 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 584 list_del(&cmd->se_lun_node);
a1d8b49a 585 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 586#if 0
6708bb27 587 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 588 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 589#endif
590 }
591 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
592}
593
594void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
595{
5951146d 596 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 597 transport_lun_remove_cmd(cmd);
598
599 if (transport_cmd_check_stop_to_fabric(cmd))
600 return;
601 if (remove)
35462975 602 transport_generic_remove(cmd, 0);
c66ac9db
NB		 603}
604
605void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
606{
5951146d 607 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 608
609 if (transport_cmd_check_stop_to_fabric(cmd))
610 return;
611
35462975 612 transport_generic_remove(cmd, 0);
c66ac9db
NB		 613}
614
5951146d 615static void transport_add_cmd_to_queue(
c66ac9db
NB		 616 struct se_cmd *cmd,
617 int t_state)
618{
619 struct se_device *dev = cmd->se_dev;
e3d6f909 620 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 621 unsigned long flags;
622
5951146d 623 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db
NB		 624
625 if (t_state) {
a1d8b49a 626 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 627 cmd->t_state = t_state;
a1d8b49a
AG		 628 atomic_set(&cmd->t_transport_active, 1);
629 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 630 }
631
632 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
07bde79a
NB		 633 if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
634 cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
635 list_add(&cmd->se_queue_node, &qobj->qobj_list);
636 } else
637 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
a1d8b49a 638 atomic_inc(&cmd->t_transport_queue_active);
c66ac9db
NB		 639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640
641 atomic_inc(&qobj->queue_cnt);
642 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 643}
644
5951146d
AG		 645static struct se_cmd *
646transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 647{
5951146d 648 struct se_cmd *cmd;
c66ac9db
NB		 649 unsigned long flags;
650
651 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
652 if (list_empty(&qobj->qobj_list)) {
653 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
654 return NULL;
655 }
5951146d 656 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 657
a1d8b49a 658 atomic_dec(&cmd->t_transport_queue_active);
c66ac9db 659
5951146d 660 list_del(&cmd->se_queue_node);
c66ac9db
NB		 661 atomic_dec(&qobj->queue_cnt);
662 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
663
5951146d 664 return cmd;
c66ac9db
NB		 665}
666
667static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
668 struct se_queue_obj *qobj)
669{
5951146d 670 struct se_cmd *t;
c66ac9db
NB		 671 unsigned long flags;
672
673 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 674 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 675 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
676 return;
677 }
678
5951146d
AG		 679 list_for_each_entry(t, &qobj->qobj_list, se_queue_node)
680 if (t == cmd) {
a1d8b49a 681 atomic_dec(&cmd->t_transport_queue_active);
5951146d
AG		 682 atomic_dec(&qobj->queue_cnt);
683 list_del(&cmd->se_queue_node);
684 break;
685 }
c66ac9db
NB		 686 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
687
a1d8b49a 688 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 689 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 690 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 691 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 692 }
693}
694
695/*
696 * Completion function used by TCM subsystem plugins (such as FILEIO)
697 * for queueing up response from struct se_subsystem_api->do_task()
698 */
699void transport_complete_sync_cache(struct se_cmd *cmd, int good)
700{
a1d8b49a 701 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 702 struct se_task, t_list);
703
704 if (good) {
705 cmd->scsi_status = SAM_STAT_GOOD;
706 task->task_scsi_status = GOOD;
707 } else {
708 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
709 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 710 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 711 PYX_TRANSPORT_ILLEGAL_REQUEST;
712 }
713
714 transport_complete_task(task, good);
715}
716EXPORT_SYMBOL(transport_complete_sync_cache);
717
718/* transport_complete_task():
719 *
720 * Called from interrupt and non interrupt context depending
721 * on the transport plugin.
722 */
723void transport_complete_task(struct se_task *task, int success)
724{
e3d6f909 725 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 726 struct se_device *dev = task->se_dev;
727 int t_state;
728 unsigned long flags;
729#if 0
6708bb27 730 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 731 cmd->t_task_cdb[0], dev);
c66ac9db 732#endif
e3d6f909 733 if (dev)
c66ac9db 734 atomic_inc(&dev->depth_left);
c66ac9db 735
a1d8b49a 736 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 737 atomic_set(&task->task_active, 0);
738
739 /*
740 * See if any sense data exists, if so set the TASK_SENSE flag.
741 * Also check for any other post completion work that needs to be
742 * done by the plugins.
743 */
744 if (dev && dev->transport->transport_complete) {
745 if (dev->transport->transport_complete(task) != 0) {
746 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
747 task->task_sense = 1;
748 success = 1;
749 }
750 }
751
752 /*
753 * See if we are waiting for outstanding struct se_task
754 * to complete for an exception condition
755 */
756 if (atomic_read(&task->task_stop)) {
757 /*
a1d8b49a 758 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 759 * previously thrown its timeout exception handler.
760 */
761 if (atomic_read(&task->task_timeout)) {
a1d8b49a 762 atomic_dec(&cmd->t_se_count);
c66ac9db
NB		 763 atomic_set(&task->task_timeout, 0);
764 }
a1d8b49a 765 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 766
767 complete(&task->task_stop_comp);
768 return;
769 }
770 /*
771 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
772 * left counter to determine when the struct se_cmd is ready to be queued to
773 * the processing thread.
774 */
775 if (atomic_read(&task->task_timeout)) {
6708bb27
AG		 776 if (!atomic_dec_and_test(
777 &cmd->t_task_cdbs_timeout_left)) {
a1d8b49a 778 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 779 flags);
780 return;
781 }
782 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 783 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 784
785 transport_add_cmd_to_queue(cmd, t_state);
786 return;
787 }
a1d8b49a 788 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 789
790 /*
791 * Decrement the outstanding t_task_cdbs_left count. The last
792 * struct se_task from struct se_cmd will complete itself into the
793 * device queue depending upon int success.
794 */
6708bb27 795 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
c66ac9db 796 if (!success)
a1d8b49a 797 cmd->t_tasks_failed = 1;
c66ac9db 798
a1d8b49a 799 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 800 return;
801 }
802
a1d8b49a 803 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 804 t_state = TRANSPORT_COMPLETE_FAILURE;
805 if (!task->task_error_status) {
806 task->task_error_status =
807 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
808 cmd->transport_error_status =
809 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
810 }
811 } else {
a1d8b49a 812 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 813 t_state = TRANSPORT_COMPLETE_OK;
814 }
a1d8b49a 815 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 816
817 transport_add_cmd_to_queue(cmd, t_state);
818}
819EXPORT_SYMBOL(transport_complete_task);
820
821/*
822 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
823 * struct se_task list are ready to be added to the active execution list
824 * struct se_device
825
826 * Called with se_dev_t->execute_task_lock called.
827 */
828static inline int transport_add_task_check_sam_attr(
829 struct se_task *task,
830 struct se_task *task_prev,
831 struct se_device *dev)
832{
833 /*
834 * No SAM Task attribute emulation enabled, add to tail of
835 * execution queue
836 */
837 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
838 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
839 return 0;
840 }
841 /*
842 * HEAD_OF_QUEUE attribute for received CDB, which means
843 * the first task that is associated with a struct se_cmd goes to
844 * head of the struct se_device->execute_task_list, and task_prev
845 * after that for each subsequent task
846 */
e66ecd50 847 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 848 list_add(&task->t_execute_list,
849 (task_prev != NULL) ?
850 &task_prev->t_execute_list :
851 &dev->execute_task_list);
852
6708bb27 853 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 854 " in execution queue\n",
6708bb27 855 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 856 return 1;
857 }
858 /*
859 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
860 * transitioned from Dermant -> Active state, and are added to the end
861 * of the struct se_device->execute_task_list
862 */
863 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
864 return 0;
865}
866
867/* __transport_add_task_to_execute_queue():
868 *
869 * Called with se_dev_t->execute_task_lock called.
870 */
871static void __transport_add_task_to_execute_queue(
872 struct se_task *task,
873 struct se_task *task_prev,
874 struct se_device *dev)
875{
876 int head_of_queue;
877
878 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
879 atomic_inc(&dev->execute_tasks);
880
881 if (atomic_read(&task->task_state_active))
882 return;
883 /*
884 * Determine if this task needs to go to HEAD_OF_QUEUE for the
885 * state list as well. Running with SAM Task Attribute emulation
886 * will always return head_of_queue == 0 here
887 */
888 if (head_of_queue)
889 list_add(&task->t_state_list, (task_prev) ?
890 &task_prev->t_state_list :
891 &dev->state_task_list);
892 else
893 list_add_tail(&task->t_state_list, &dev->state_task_list);
894
895 atomic_set(&task->task_state_active, 1);
896
6708bb27 897 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 898 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 899 task, dev);
900}
901
902static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
903{
904 struct se_device *dev;
905 struct se_task *task;
906 unsigned long flags;
907
a1d8b49a
AG		 908 spin_lock_irqsave(&cmd->t_state_lock, flags);
909 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 910 dev = task->se_dev;
911
912 if (atomic_read(&task->task_state_active))
913 continue;
914
915 spin_lock(&dev->execute_task_lock);
916 list_add_tail(&task->t_state_list, &dev->state_task_list);
917 atomic_set(&task->task_state_active, 1);
918
6708bb27
AG		 919 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
920 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 921 task->task_se_cmd), task, dev);
922
923 spin_unlock(&dev->execute_task_lock);
924 }
a1d8b49a 925 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 926}
927
928static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
929{
5951146d 930 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 931 struct se_task *task, *task_prev = NULL;
932 unsigned long flags;
933
934 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 935 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 936 if (atomic_read(&task->task_execute_queue))
937 continue;
938 /*
939 * __transport_add_task_to_execute_queue() handles the
940 * SAM Task Attribute emulation if enabled
941 */
942 __transport_add_task_to_execute_queue(task, task_prev, dev);
943 atomic_set(&task->task_execute_queue, 1);
944 task_prev = task;
945 }
946 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 947}
948
949/* transport_remove_task_from_execute_queue():
950 *
951 *
952 */
52208ae3 953void transport_remove_task_from_execute_queue(
c66ac9db
NB		 954 struct se_task *task,
955 struct se_device *dev)
956{
957 unsigned long flags;
958
af57c3ac
NB		 959 if (atomic_read(&task->task_execute_queue) == 0) {
960 dump_stack();
961 return;
962 }
963
c66ac9db
NB		 964 spin_lock_irqsave(&dev->execute_task_lock, flags);
965 list_del(&task->t_execute_list);
af57c3ac 966 atomic_set(&task->task_execute_queue, 0);
c66ac9db
NB		 967 atomic_dec(&dev->execute_tasks);
968 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
969}
970
07bde79a
NB		 971/*
972 * Handle QUEUE_FULL / -EAGAIN status
973 */
974
975static void target_qf_do_work(struct work_struct *work)
976{
977 struct se_device *dev = container_of(work, struct se_device,
978 qf_work_queue);
979 struct se_cmd *cmd, *cmd_tmp;
980
981 spin_lock_irq(&dev->qf_cmd_lock);
982 list_for_each_entry_safe(cmd, cmd_tmp, &dev->qf_cmd_list, se_qf_node) {
983
984 list_del(&cmd->se_qf_node);
985 atomic_dec(&dev->dev_qf_count);
986 smp_mb__after_atomic_dec();
987 spin_unlock_irq(&dev->qf_cmd_lock);
988
6708bb27 989 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a
NB		 990 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
991 (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" :
992 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
993 : "UNKNOWN");
994 /*
995 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
996 * has been added to head of queue
997 */
998 transport_add_cmd_to_queue(cmd, cmd->t_state);
999
1000 spin_lock_irq(&dev->qf_cmd_lock);
1001 }
1002 spin_unlock_irq(&dev->qf_cmd_lock);
1003}
1004
c66ac9db
NB		 1005unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1006{
1007 switch (cmd->data_direction) {
1008 case DMA_NONE:
1009 return "NONE";
1010 case DMA_FROM_DEVICE:
1011 return "READ";
1012 case DMA_TO_DEVICE:
1013 return "WRITE";
1014 case DMA_BIDIRECTIONAL:
1015 return "BIDI";
1016 default:
1017 break;
1018 }
1019
1020 return "UNKNOWN";
1021}
1022
1023void transport_dump_dev_state(
1024 struct se_device *dev,
1025 char *b,
1026 int *bl)
1027{
1028 *bl += sprintf(b + *bl, "Status: ");
1029 switch (dev->dev_status) {
1030 case TRANSPORT_DEVICE_ACTIVATED:
1031 *bl += sprintf(b + *bl, "ACTIVATED");
1032 break;
1033 case TRANSPORT_DEVICE_DEACTIVATED:
1034 *bl += sprintf(b + *bl, "DEACTIVATED");
1035 break;
1036 case TRANSPORT_DEVICE_SHUTDOWN:
1037 *bl += sprintf(b + *bl, "SHUTDOWN");
1038 break;
1039 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1040 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1041 *bl += sprintf(b + *bl, "OFFLINE");
1042 break;
1043 default:
1044 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1045 break;
1046 }
1047
1048 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1049 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1050 dev->queue_depth);
1051 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1052 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1053 *bl += sprintf(b + *bl, " ");
1054}
1055
1056/* transport_release_all_cmds():
1057 *
1058 *
1059 */
1060static void transport_release_all_cmds(struct se_device *dev)
1061{
5951146d 1062 struct se_cmd *cmd, *tcmd;
c66ac9db
NB		 1063 int bug_out = 0, t_state;
1064 unsigned long flags;
1065
e3d6f909 1066 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
5951146d
AG		 1067 list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1068 se_queue_node) {
1069 t_state = cmd->t_state;
1070 list_del(&cmd->se_queue_node);
e3d6f909 1071 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
c66ac9db
NB		 1072 flags);
1073
6708bb27 1074 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
c66ac9db 1075 " t_state: %u directly\n",
e3d6f909
AG		 1076 cmd->se_tfo->get_task_tag(cmd),
1077 cmd->se_tfo->get_cmd_state(cmd), t_state);
c66ac9db
NB		 1078
1079 transport_release_fe_cmd(cmd);
1080 bug_out = 1;
1081
e3d6f909 1082 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db 1083 }
e3d6f909 1084 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db
NB		 1085#if 0
1086 if (bug_out)
1087 BUG();
1088#endif
1089}
1090
1091void transport_dump_vpd_proto_id(
1092 struct t10_vpd *vpd,
1093 unsigned char *p_buf,
1094 int p_buf_len)
1095{
1096 unsigned char buf[VPD_TMP_BUF_SIZE];
1097 int len;
1098
1099 memset(buf, 0, VPD_TMP_BUF_SIZE);
1100 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1101
1102 switch (vpd->protocol_identifier) {
1103 case 0x00:
1104 sprintf(buf+len, "Fibre Channel\n");
1105 break;
1106 case 0x10:
1107 sprintf(buf+len, "Parallel SCSI\n");
1108 break;
1109 case 0x20:
1110 sprintf(buf+len, "SSA\n");
1111 break;
1112 case 0x30:
1113 sprintf(buf+len, "IEEE 1394\n");
1114 break;
1115 case 0x40:
1116 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1117 " Protocol\n");
1118 break;
1119 case 0x50:
1120 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1121 break;
1122 case 0x60:
1123 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1124 break;
1125 case 0x70:
1126 sprintf(buf+len, "Automation/Drive Interface Transport"
1127 " Protocol\n");
1128 break;
1129 case 0x80:
1130 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1131 break;
1132 default:
1133 sprintf(buf+len, "Unknown 0x%02x\n",
1134 vpd->protocol_identifier);
1135 break;
1136 }
1137
1138 if (p_buf)
1139 strncpy(p_buf, buf, p_buf_len);
1140 else
6708bb27 1141 pr_debug("%s", buf);
c66ac9db
NB		 1142}
1143
1144void
1145transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1146{
1147 /*
1148 * Check if the Protocol Identifier Valid (PIV) bit is set..
1149 *
1150 * from spc3r23.pdf section 7.5.1
1151 */
1152 if (page_83[1] & 0x80) {
1153 vpd->protocol_identifier = (page_83[0] & 0xf0);
1154 vpd->protocol_identifier_set = 1;
1155 transport_dump_vpd_proto_id(vpd, NULL, 0);
1156 }
1157}
1158EXPORT_SYMBOL(transport_set_vpd_proto_id);
1159
1160int transport_dump_vpd_assoc(
1161 struct t10_vpd *vpd,
1162 unsigned char *p_buf,
1163 int p_buf_len)
1164{
1165 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1166 int ret = 0;
1167 int len;
c66ac9db
NB		 1168
1169 memset(buf, 0, VPD_TMP_BUF_SIZE);
1170 len = sprintf(buf, "T10 VPD Identifier Association: ");
1171
1172 switch (vpd->association) {
1173 case 0x00:
1174 sprintf(buf+len, "addressed logical unit\n");
1175 break;
1176 case 0x10:
1177 sprintf(buf+len, "target port\n");
1178 break;
1179 case 0x20:
1180 sprintf(buf+len, "SCSI target device\n");
1181 break;
1182 default:
1183 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1184 ret = -EINVAL;
c66ac9db
NB		 1185 break;
1186 }
1187
1188 if (p_buf)
1189 strncpy(p_buf, buf, p_buf_len);
1190 else
6708bb27 1191 pr_debug("%s", buf);
c66ac9db
NB		 1192
1193 return ret;
1194}
1195
1196int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1197{
1198 /*
1199 * The VPD identification association..
1200 *
1201 * from spc3r23.pdf Section 7.6.3.1 Table 297
1202 */
1203 vpd->association = (page_83[1] & 0x30);
1204 return transport_dump_vpd_assoc(vpd, NULL, 0);
1205}
1206EXPORT_SYMBOL(transport_set_vpd_assoc);
1207
1208int transport_dump_vpd_ident_type(
1209 struct t10_vpd *vpd,
1210 unsigned char *p_buf,
1211 int p_buf_len)
1212{
1213 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1214 int ret = 0;
1215 int len;
c66ac9db
NB		 1216
1217 memset(buf, 0, VPD_TMP_BUF_SIZE);
1218 len = sprintf(buf, "T10 VPD Identifier Type: ");
1219
1220 switch (vpd->device_identifier_type) {
1221 case 0x00:
1222 sprintf(buf+len, "Vendor specific\n");
1223 break;
1224 case 0x01:
1225 sprintf(buf+len, "T10 Vendor ID based\n");
1226 break;
1227 case 0x02:
1228 sprintf(buf+len, "EUI-64 based\n");
1229 break;
1230 case 0x03:
1231 sprintf(buf+len, "NAA\n");
1232 break;
1233 case 0x04:
1234 sprintf(buf+len, "Relative target port identifier\n");
1235 break;
1236 case 0x08:
1237 sprintf(buf+len, "SCSI name string\n");
1238 break;
1239 default:
1240 sprintf(buf+len, "Unsupported: 0x%02x\n",
1241 vpd->device_identifier_type);
e3d6f909 1242 ret = -EINVAL;
c66ac9db
NB		 1243 break;
1244 }
1245
e3d6f909
AG		 1246 if (p_buf) {
1247 if (p_buf_len < strlen(buf)+1)
1248 return -EINVAL;
c66ac9db 1249 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1250 } else {
6708bb27 1251 pr_debug("%s", buf);
e3d6f909 1252 }
c66ac9db
NB		 1253
1254 return ret;
1255}
1256
1257int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1258{
1259 /*
1260 * The VPD identifier type..
1261 *
1262 * from spc3r23.pdf Section 7.6.3.1 Table 298
1263 */
1264 vpd->device_identifier_type = (page_83[1] & 0x0f);
1265 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1266}
1267EXPORT_SYMBOL(transport_set_vpd_ident_type);
1268
1269int transport_dump_vpd_ident(
1270 struct t10_vpd *vpd,
1271 unsigned char *p_buf,
1272 int p_buf_len)
1273{
1274 unsigned char buf[VPD_TMP_BUF_SIZE];
1275 int ret = 0;
1276
1277 memset(buf, 0, VPD_TMP_BUF_SIZE);
1278
1279 switch (vpd->device_identifier_code_set) {
1280 case 0x01: /* Binary */
1281 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1282 &vpd->device_identifier[0]);
1283 break;
1284 case 0x02: /* ASCII */
1285 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1286 &vpd->device_identifier[0]);
1287 break;
1288 case 0x03: /* UTF-8 */
1289 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1290 &vpd->device_identifier[0]);
1291 break;
1292 default:
1293 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1294 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1295 ret = -EINVAL;
c66ac9db
NB		 1296 break;
1297 }
1298
1299 if (p_buf)
1300 strncpy(p_buf, buf, p_buf_len);
1301 else
6708bb27 1302 pr_debug("%s", buf);
c66ac9db
NB		 1303
1304 return ret;
1305}
1306
1307int
1308transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1309{
1310 static const char hex_str[] = "0123456789abcdef";
1311 int j = 0, i = 4; /* offset to start of the identifer */
1312
1313 /*
1314 * The VPD Code Set (encoding)
1315 *
1316 * from spc3r23.pdf Section 7.6.3.1 Table 296
1317 */
1318 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1319 switch (vpd->device_identifier_code_set) {
1320 case 0x01: /* Binary */
1321 vpd->device_identifier[j++] =
1322 hex_str[vpd->device_identifier_type];
1323 while (i < (4 + page_83[3])) {
1324 vpd->device_identifier[j++] =
1325 hex_str[(page_83[i] & 0xf0) >> 4];
1326 vpd->device_identifier[j++] =
1327 hex_str[page_83[i] & 0x0f];
1328 i++;
1329 }
1330 break;
1331 case 0x02: /* ASCII */
1332 case 0x03: /* UTF-8 */
1333 while (i < (4 + page_83[3]))
1334 vpd->device_identifier[j++] = page_83[i++];
1335 break;
1336 default:
1337 break;
1338 }
1339
1340 return transport_dump_vpd_ident(vpd, NULL, 0);
1341}
1342EXPORT_SYMBOL(transport_set_vpd_ident);
1343
1344static void core_setup_task_attr_emulation(struct se_device *dev)
1345{
1346 /*
1347 * If this device is from Target_Core_Mod/pSCSI, disable the
1348 * SAM Task Attribute emulation.
1349 *
1350 * This is currently not available in upsream Linux/SCSI Target
1351 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1352 */
e3d6f909 1353 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1354 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1355 return;
1356 }
1357
1358 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1359 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1360 " device\n", dev->transport->name,
1361 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1362}
1363
1364static void scsi_dump_inquiry(struct se_device *dev)
1365{
e3d6f909 1366 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1367 int i, device_type;
1368 /*
1369 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1370 */
6708bb27 1371 pr_debug(" Vendor: ");
c66ac9db
NB		 1372 for (i = 0; i < 8; i++)
1373 if (wwn->vendor[i] >= 0x20)
6708bb27 1374 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1375 else
6708bb27 1376 pr_debug(" ");
c66ac9db 1377
6708bb27 1378 pr_debug(" Model: ");
c66ac9db
NB		 1379 for (i = 0; i < 16; i++)
1380 if (wwn->model[i] >= 0x20)
6708bb27 1381 pr_debug("%c", wwn->model[i]);
c66ac9db 1382 else
6708bb27 1383 pr_debug(" ");
c66ac9db 1384
6708bb27 1385 pr_debug(" Revision: ");
c66ac9db
NB		 1386 for (i = 0; i < 4; i++)
1387 if (wwn->revision[i] >= 0x20)
6708bb27 1388 pr_debug("%c", wwn->revision[i]);
c66ac9db 1389 else
6708bb27 1390 pr_debug(" ");
c66ac9db 1391
6708bb27 1392 pr_debug("\n");
c66ac9db 1393
e3d6f909 1394 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1395 pr_debug(" Type: %s ", scsi_device_type(device_type));
1396 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1397 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1398}
1399
1400struct se_device *transport_add_device_to_core_hba(
1401 struct se_hba *hba,
1402 struct se_subsystem_api *transport,
1403 struct se_subsystem_dev *se_dev,
1404 u32 device_flags,
1405 void *transport_dev,
1406 struct se_dev_limits *dev_limits,
1407 const char *inquiry_prod,
1408 const char *inquiry_rev)
1409{
12a18bdc 1410 int force_pt;
c66ac9db
NB		 1411 struct se_device *dev;
1412
1413 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1414 if (!dev) {
1415 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1416 return NULL;
1417 }
c66ac9db 1418
e3d6f909 1419 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1420 dev->dev_flags = device_flags;
1421 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1422 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1423 dev->se_hba = hba;
1424 dev->se_sub_dev = se_dev;
1425 dev->transport = transport;
1426 atomic_set(&dev->active_cmds, 0);
1427 INIT_LIST_HEAD(&dev->dev_list);
1428 INIT_LIST_HEAD(&dev->dev_sep_list);
1429 INIT_LIST_HEAD(&dev->dev_tmr_list);
1430 INIT_LIST_HEAD(&dev->execute_task_list);
1431 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1432 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1433 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1434 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1435 spin_lock_init(&dev->execute_task_lock);
1436 spin_lock_init(&dev->delayed_cmd_lock);
1437 spin_lock_init(&dev->ordered_cmd_lock);
1438 spin_lock_init(&dev->state_task_lock);
1439 spin_lock_init(&dev->dev_alua_lock);
1440 spin_lock_init(&dev->dev_reservation_lock);
1441 spin_lock_init(&dev->dev_status_lock);
1442 spin_lock_init(&dev->dev_status_thr_lock);
1443 spin_lock_init(&dev->se_port_lock);
1444 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1445 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1446
1447 dev->queue_depth = dev_limits->queue_depth;
1448 atomic_set(&dev->depth_left, dev->queue_depth);
1449 atomic_set(&dev->dev_ordered_id, 0);
1450
1451 se_dev_set_default_attribs(dev, dev_limits);
1452
1453 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1454 dev->creation_time = get_jiffies_64();
1455 spin_lock_init(&dev->stats_lock);
1456
1457 spin_lock(&hba->device_lock);
1458 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1459 hba->dev_count++;
1460 spin_unlock(&hba->device_lock);
1461 /*
1462 * Setup the SAM Task Attribute emulation for struct se_device
1463 */
1464 core_setup_task_attr_emulation(dev);
1465 /*
1466 * Force PR and ALUA passthrough emulation with internal object use.
1467 */
1468 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1469 /*
1470 * Setup the Reservations infrastructure for struct se_device
1471 */
1472 core_setup_reservations(dev, force_pt);
1473 /*
1474 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1475 */
1476 if (core_setup_alua(dev, force_pt) < 0)
1477 goto out;
1478
1479 /*
1480 * Startup the struct se_device processing thread
1481 */
1482 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1483 "LIO_%s", dev->transport->name);
c66ac9db 1484 if (IS_ERR(dev->process_thread)) {
6708bb27 1485 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1486 dev->transport->name);
c66ac9db
NB		 1487 goto out;
1488 }
07bde79a
NB		 1489 /*
1490 * Setup work_queue for QUEUE_FULL
1491 */
1492 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1493 /*
1494 * Preload the initial INQUIRY const values if we are doing
1495 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1496 * passthrough because this is being provided by the backend LLD.
1497 * This is required so that transport_get_inquiry() copies these
1498 * originals once back into DEV_T10_WWN(dev) for the virtual device
1499 * setup.
1500 */
e3d6f909 1501 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1502 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1503 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1504 " INQUIRY consts\n");
1505 goto out;
1506 }
1507
e3d6f909
AG		 1508 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1509 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1510 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1511 }
1512 scsi_dump_inquiry(dev);
1513
12a18bdc 1514 return dev;
c66ac9db 1515out:
c66ac9db
NB		 1516 kthread_stop(dev->process_thread);
1517
1518 spin_lock(&hba->device_lock);
1519 list_del(&dev->dev_list);
1520 hba->dev_count--;
1521 spin_unlock(&hba->device_lock);
1522
1523 se_release_vpd_for_dev(dev);
1524
c66ac9db
NB		 1525 kfree(dev);
1526
1527 return NULL;
1528}
1529EXPORT_SYMBOL(transport_add_device_to_core_hba);
1530
1531/* transport_generic_prepare_cdb():
1532 *
1533 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1534 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1535 * The point of this is since we are mapping iSCSI LUNs to
1536 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1537 * devices and HBAs for a loop.
1538 */
1539static inline void transport_generic_prepare_cdb(
1540 unsigned char *cdb)
1541{
1542 switch (cdb[0]) {
1543 case READ_10: /* SBC - RDProtect */
1544 case READ_12: /* SBC - RDProtect */
1545 case READ_16: /* SBC - RDProtect */
1546 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1547 case VERIFY: /* SBC - VRProtect */
1548 case VERIFY_16: /* SBC - VRProtect */
1549 case WRITE_VERIFY: /* SBC - VRProtect */
1550 case WRITE_VERIFY_12: /* SBC - VRProtect */
1551 break;
1552 default:
1553 cdb[1] &= 0x1f; /* clear logical unit number */
1554 break;
1555 }
1556}
1557
1558static struct se_task *
1559transport_generic_get_task(struct se_cmd *cmd,
1560 enum dma_data_direction data_direction)
1561{
1562 struct se_task *task;
5951146d 1563 struct se_device *dev = cmd->se_dev;
c66ac9db 1564
6708bb27 1565 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1566 if (!task) {
6708bb27 1567 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1568 return NULL;
1569 }
1570
1571 INIT_LIST_HEAD(&task->t_list);
1572 INIT_LIST_HEAD(&task->t_execute_list);
1573 INIT_LIST_HEAD(&task->t_state_list);
1574 init_completion(&task->task_stop_comp);
c66ac9db
NB		 1575 task->task_se_cmd = cmd;
1576 task->se_dev = dev;
1577 task->task_data_direction = data_direction;
1578
c66ac9db
NB		 1579 return task;
1580}
1581
1582static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1583
c66ac9db
NB		 1584/*
1585 * Used by fabric modules containing a local struct se_cmd within their
1586 * fabric dependent per I/O descriptor.
1587 */
1588void transport_init_se_cmd(
1589 struct se_cmd *cmd,
1590 struct target_core_fabric_ops *tfo,
1591 struct se_session *se_sess,
1592 u32 data_length,
1593 int data_direction,
1594 int task_attr,
1595 unsigned char *sense_buffer)
1596{
5951146d
AG		 1597 INIT_LIST_HEAD(&cmd->se_lun_node);
1598 INIT_LIST_HEAD(&cmd->se_delayed_node);
1599 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1600 INIT_LIST_HEAD(&cmd->se_qf_node);
c66ac9db 1601
a1d8b49a
AG		 1602 INIT_LIST_HEAD(&cmd->t_task_list);
1603 init_completion(&cmd->transport_lun_fe_stop_comp);
1604 init_completion(&cmd->transport_lun_stop_comp);
1605 init_completion(&cmd->t_transport_stop_comp);
1606 spin_lock_init(&cmd->t_state_lock);
1607 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1608
1609 cmd->se_tfo = tfo;
1610 cmd->se_sess = se_sess;
1611 cmd->data_length = data_length;
1612 cmd->data_direction = data_direction;
1613 cmd->sam_task_attr = task_attr;
1614 cmd->sense_buffer = sense_buffer;
1615}
1616EXPORT_SYMBOL(transport_init_se_cmd);
1617
1618static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1619{
1620 /*
1621 * Check if SAM Task Attribute emulation is enabled for this
1622 * struct se_device storage object
1623 */
5951146d 1624 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1625 return 0;
1626
e66ecd50 1627 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1628 pr_debug("SAM Task Attribute ACA"
c66ac9db 1629 " emulation is not supported\n");
e3d6f909 1630 return -EINVAL;
c66ac9db
NB		 1631 }
1632 /*
1633 * Used to determine when ORDERED commands should go from
1634 * Dormant to Active status.
1635 */
5951146d 1636 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1637 smp_mb__after_atomic_inc();
6708bb27 1638 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1639 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1640 cmd->se_dev->transport->name);
c66ac9db
NB		 1641 return 0;
1642}
1643
1644void transport_free_se_cmd(
1645 struct se_cmd *se_cmd)
1646{
1647 if (se_cmd->se_tmr_req)
1648 core_tmr_release_req(se_cmd->se_tmr_req);
1649 /*
1650 * Check and free any extended CDB buffer that was allocated
1651 */
a1d8b49a
AG		 1652 if (se_cmd->t_task_cdb != se_cmd->__t_task_cdb)
1653 kfree(se_cmd->t_task_cdb);
c66ac9db
NB		 1654}
1655EXPORT_SYMBOL(transport_free_se_cmd);
1656
1657static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1658
1659/* transport_generic_allocate_tasks():
1660 *
1661 * Called from fabric RX Thread.
1662 */
1663int transport_generic_allocate_tasks(
1664 struct se_cmd *cmd,
1665 unsigned char *cdb)
1666{
1667 int ret;
1668
1669 transport_generic_prepare_cdb(cdb);
1670
1671 /*
1672 * This is needed for early exceptions.
1673 */
1674 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1675
c66ac9db
NB		 1676 /*
1677 * Ensure that the received CDB is less than the max (252 + 8) bytes
1678 * for VARIABLE_LENGTH_CMD
1679 */
1680 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1681 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1682 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1683 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1684 return -EINVAL;
c66ac9db
NB		 1685 }
1686 /*
1687 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1688 * allocate the additional extended CDB buffer now.. Otherwise
1689 * setup the pointer from __t_task_cdb to t_task_cdb.
1690 */
a1d8b49a
AG		 1691 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1692 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1693 GFP_KERNEL);
6708bb27
AG		 1694 if (!cmd->t_task_cdb) {
1695 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1696 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1697 scsi_command_size(cdb),
a1d8b49a 1698 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1699 return -ENOMEM;
c66ac9db
NB		 1700 }
1701 } else
a1d8b49a 1702 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1703 /*
a1d8b49a 1704 * Copy the original CDB into cmd->
c66ac9db 1705 */
a1d8b49a 1706 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1707 /*
1708 * Setup the received CDB based on SCSI defined opcodes and
1709 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1710 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1711 * pointer is expected to be setup before we reach this point.
1712 */
1713 ret = transport_generic_cmd_sequencer(cmd, cdb);
1714 if (ret < 0)
1715 return ret;
1716 /*
1717 * Check for SAM Task Attribute Emulation
1718 */
1719 if (transport_check_alloc_task_attr(cmd) < 0) {
1720 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1721 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1722 return -EINVAL;
c66ac9db
NB		 1723 }
1724 spin_lock(&cmd->se_lun->lun_sep_lock);
1725 if (cmd->se_lun->lun_sep)
1726 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1727 spin_unlock(&cmd->se_lun->lun_sep_lock);
1728 return 0;
1729}
1730EXPORT_SYMBOL(transport_generic_allocate_tasks);
1731
1732/*
1733 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1734 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1735 */
1736int transport_generic_handle_cdb(
1737 struct se_cmd *cmd)
1738{
e3d6f909 1739 if (!cmd->se_lun) {
c66ac9db 1740 dump_stack();
6708bb27 1741 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1742 return -EINVAL;
c66ac9db 1743 }
695434e1 1744
c66ac9db
NB		 1745 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
1746 return 0;
1747}
1748EXPORT_SYMBOL(transport_generic_handle_cdb);
1749
dd8ae59d
NB		 1750static void transport_generic_request_failure(struct se_cmd *,
1751 struct se_device *, int, int);
695434e1
NB		 1752/*
1753 * Used by fabric module frontends to queue tasks directly.
1754 * Many only be used from process context only
1755 */
1756int transport_handle_cdb_direct(
1757 struct se_cmd *cmd)
1758{
dd8ae59d
NB		 1759 int ret;
1760
695434e1
NB		 1761 if (!cmd->se_lun) {
1762 dump_stack();
6708bb27 1763 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1764 return -EINVAL;
1765 }
1766 if (in_interrupt()) {
1767 dump_stack();
6708bb27 1768 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1769 " from interrupt context\n");
1770 return -EINVAL;
1771 }
dd8ae59d
NB		 1772 /*
1773 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1774 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1775 * in existing usage to ensure that outstanding descriptors are handled
1776 * correctly during shutdown via transport_generic_wait_for_tasks()
1777 *
1778 * Also, we don't take cmd->t_state_lock here as we only expect
1779 * this to be called for initial descriptor submission.
1780 */
1781 cmd->t_state = TRANSPORT_NEW_CMD;
1782 atomic_set(&cmd->t_transport_active, 1);
1783 /*
1784 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1785 * so follow TRANSPORT_NEW_CMD processing thread context usage
1786 * and call transport_generic_request_failure() if necessary..
1787 */
1788 ret = transport_generic_new_cmd(cmd);
1789 if (ret == -EAGAIN)
1790 return 0;
1791 else if (ret < 0) {
1792 cmd->transport_error_status = ret;
1793 transport_generic_request_failure(cmd, NULL, 0,
1794 (cmd->data_direction != DMA_TO_DEVICE));
1795 }
1796 return 0;
695434e1
NB		 1797}
1798EXPORT_SYMBOL(transport_handle_cdb_direct);
1799
c66ac9db
NB		 1800/*
1801 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1802 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1803 * complete setup in TCM process context w/ TFO->new_cmd_map().
1804 */
1805int transport_generic_handle_cdb_map(
1806 struct se_cmd *cmd)
1807{
e3d6f909 1808 if (!cmd->se_lun) {
c66ac9db 1809 dump_stack();
6708bb27 1810 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1811 return -EINVAL;
c66ac9db
NB		 1812 }
1813
1814 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1815 return 0;
1816}
1817EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1818
1819/* transport_generic_handle_data():
1820 *
1821 *
1822 */
1823int transport_generic_handle_data(
1824 struct se_cmd *cmd)
1825{
1826 /*
1827 * For the software fabric case, then we assume the nexus is being
1828 * failed/shutdown when signals are pending from the kthread context
1829 * caller, so we return a failure. For the HW target mode case running
1830 * in interrupt code, the signal_pending() check is skipped.
1831 */
1832 if (!in_interrupt() && signal_pending(current))
e3d6f909 1833 return -EPERM;
c66ac9db
NB		 1834 /*
1835 * If the received CDB has aleady been ABORTED by the generic
1836 * target engine, we now call transport_check_aborted_status()
1837 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1838 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1839 * sequences at this point.
1840 */
1841 if (transport_check_aborted_status(cmd, 1) != 0)
1842 return 0;
1843
1844 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1845 return 0;
1846}
1847EXPORT_SYMBOL(transport_generic_handle_data);
1848
1849/* transport_generic_handle_tmr():
1850 *
1851 *
1852 */
1853int transport_generic_handle_tmr(
1854 struct se_cmd *cmd)
1855{
1856 /*
1857 * This is needed for early exceptions.
1858 */
1859 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
c66ac9db
NB		 1860
1861 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1862 return 0;
1863}
1864EXPORT_SYMBOL(transport_generic_handle_tmr);
1865
f4366772
NB		 1866void transport_generic_free_cmd_intr(
1867 struct se_cmd *cmd)
1868{
1869 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1870}
1871EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1872
c66ac9db
NB		 1873static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1874{
1875 struct se_task *task, *task_tmp;
1876 unsigned long flags;
1877 int ret = 0;
1878
6708bb27 1879 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1880 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1881
1882 /*
1883 * No tasks remain in the execution queue
1884 */
a1d8b49a 1885 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1886 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1887 &cmd->t_task_list, t_list) {
6708bb27 1888 pr_debug("task_no[%d] - Processing task %p\n",
c66ac9db
NB		 1889 task->task_no, task);
1890 /*
1891 * If the struct se_task has not been sent and is not active,
1892 * remove the struct se_task from the execution queue.
1893 */
1894 if (!atomic_read(&task->task_sent) &&
1895 !atomic_read(&task->task_active)) {
a1d8b49a 1896 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1897 flags);
1898 transport_remove_task_from_execute_queue(task,
1899 task->se_dev);
1900
6708bb27 1901 pr_debug("task_no[%d] - Removed from execute queue\n",
c66ac9db 1902 task->task_no);
a1d8b49a 1903 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1904 continue;
1905 }
1906
1907 /*
1908 * If the struct se_task is active, sleep until it is returned
1909 * from the plugin.
1910 */
1911 if (atomic_read(&task->task_active)) {
1912 atomic_set(&task->task_stop, 1);
a1d8b49a 1913 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1914 flags);
1915
6708bb27 1916 pr_debug("task_no[%d] - Waiting to complete\n",
c66ac9db
NB		 1917 task->task_no);
1918 wait_for_completion(&task->task_stop_comp);
6708bb27 1919 pr_debug("task_no[%d] - Stopped successfully\n",
c66ac9db
NB		 1920 task->task_no);
1921
a1d8b49a
AG		 1922 spin_lock_irqsave(&cmd->t_state_lock, flags);
1923 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 1924
1925 atomic_set(&task->task_active, 0);
1926 atomic_set(&task->task_stop, 0);
1927 } else {
6708bb27 1928 pr_debug("task_no[%d] - Did nothing\n", task->task_no);
c66ac9db
NB		 1929 ret++;
1930 }
1931
1932 __transport_stop_task_timer(task, &flags);
1933 }
a1d8b49a 1934 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1935
1936 return ret;
1937}
1938
c66ac9db
NB		 1939/*
1940 * Handle SAM-esque emulation for generic transport request failures.
1941 */
1942static void transport_generic_request_failure(
1943 struct se_cmd *cmd,
1944 struct se_device *dev,
1945 int complete,
1946 int sc)
1947{
07bde79a
NB		 1948 int ret = 0;
1949
6708bb27 1950 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1951 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1952 cmd->t_task_cdb[0]);
6708bb27 1953 pr_debug("-----[ i_state: %d t_state/def_t_state:"
c66ac9db 1954 " %d/%d transport_error_status: %d\n",
e3d6f909 1955 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 1956 cmd->t_state, cmd->deferred_t_state,
1957 cmd->transport_error_status);
6708bb27 1958 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1959 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1960 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1961 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1962 atomic_read(&cmd->t_task_cdbs_left),
1963 atomic_read(&cmd->t_task_cdbs_sent),
1964 atomic_read(&cmd->t_task_cdbs_ex_left),
1965 atomic_read(&cmd->t_transport_active),
1966 atomic_read(&cmd->t_transport_stop),
1967 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 1968
1969 transport_stop_all_task_timers(cmd);
1970
1971 if (dev)
e3d6f909 1972 atomic_inc(&dev->depth_left);
c66ac9db
NB		 1973 /*
1974 * For SAM Task Attribute emulation for failed struct se_cmd
1975 */
1976 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1977 transport_complete_task_attr(cmd);
1978
1979 if (complete) {
1980 transport_direct_request_timeout(cmd);
1981 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1982 }
1983
1984 switch (cmd->transport_error_status) {
1985 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1986 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1987 break;
1988 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1989 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1990 break;
1991 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1992 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1993 break;
1994 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1995 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1996 break;
1997 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1998 if (!sc)
1999 transport_new_cmd_failure(cmd);
2000 /*
2001 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2002 * we force this session to fall back to session
2003 * recovery.
2004 */
e3d6f909
AG		 2005 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
2006 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 2007
2008 goto check_stop;
2009 case PYX_TRANSPORT_LU_COMM_FAILURE:
2010 case PYX_TRANSPORT_ILLEGAL_REQUEST:
2011 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2012 break;
2013 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
2014 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
2015 break;
2016 case PYX_TRANSPORT_WRITE_PROTECTED:
2017 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
2018 break;
2019 case PYX_TRANSPORT_RESERVATION_CONFLICT:
2020 /*
2021 * No SENSE Data payload for this case, set SCSI Status
2022 * and queue the response to $FABRIC_MOD.
2023 *
2024 * Uses linux/include/scsi/scsi.h SAM status codes defs
2025 */
2026 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2027 /*
2028 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2029 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2030 * CONFLICT STATUS.
2031 *
2032 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2033 */
e3d6f909
AG		 2034 if (cmd->se_sess &&
2035 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2036 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2037 cmd->orig_fe_lun, 0x2C,
2038 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2039
07bde79a
NB		 2040 ret = cmd->se_tfo->queue_status(cmd);
2041 if (ret == -EAGAIN)
2042 goto queue_full;
c66ac9db
NB		 2043 goto check_stop;
2044 case PYX_TRANSPORT_USE_SENSE_REASON:
2045 /*
2046 * struct se_cmd->scsi_sense_reason already set
2047 */
2048 break;
2049 default:
6708bb27 2050 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 2051 cmd->t_task_cdb[0],
c66ac9db
NB		 2052 cmd->transport_error_status);
2053 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2054 break;
2055 }
16ab8e60
NB		 2056 /*
2057 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2058 * make the call to transport_send_check_condition_and_sense()
2059 * directly. Otherwise expect the fabric to make the call to
2060 * transport_send_check_condition_and_sense() after handling
2061 * possible unsoliticied write data payloads.
2062 */
2063 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 2064 transport_new_cmd_failure(cmd);
07bde79a
NB		 2065 else {
2066 ret = transport_send_check_condition_and_sense(cmd,
2067 cmd->scsi_sense_reason, 0);
2068 if (ret == -EAGAIN)
2069 goto queue_full;
2070 }
2071
c66ac9db
NB		 2072check_stop:
2073 transport_lun_remove_cmd(cmd);
6708bb27 2074 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 2075 ;
07bde79a
NB		 2076 return;
2077
2078queue_full:
2079 cmd->t_state = TRANSPORT_COMPLETE_OK;
2080 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 2081}
2082
2083static void transport_direct_request_timeout(struct se_cmd *cmd)
2084{
2085 unsigned long flags;
2086
a1d8b49a 2087 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 2088 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 2089 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2090 return;
2091 }
a1d8b49a
AG		 2092 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2093 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2094 return;
2095 }
2096
a1d8b49a
AG		 2097 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2098 &cmd->t_se_count);
2099 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2100}
2101
2102static void transport_generic_request_timeout(struct se_cmd *cmd)
2103{
2104 unsigned long flags;
2105
2106 /*
a1d8b49a 2107 * Reset cmd->t_se_count to allow transport_generic_remove()
c66ac9db
NB		 2108 * to allow last call to free memory resources.
2109 */
a1d8b49a
AG		 2110 spin_lock_irqsave(&cmd->t_state_lock, flags);
2111 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2112 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2113
a1d8b49a 2114 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2115 }
a1d8b49a 2116 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2117
35462975 2118 transport_generic_remove(cmd, 0);
c66ac9db
NB		 2119}
2120
c66ac9db
NB		 2121static inline u32 transport_lba_21(unsigned char *cdb)
2122{
2123 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2124}
2125
2126static inline u32 transport_lba_32(unsigned char *cdb)
2127{
2128 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2129}
2130
2131static inline unsigned long long transport_lba_64(unsigned char *cdb)
2132{
2133 unsigned int __v1, __v2;
2134
2135 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2136 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2137
2138 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2139}
2140
2141/*
2142 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2143 */
2144static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2145{
2146 unsigned int __v1, __v2;
2147
2148 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2149 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2150
2151 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2152}
2153
2154static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2155{
2156 unsigned long flags;
2157
a1d8b49a 2158 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2159 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2160 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2161}
2162
2163/*
2164 * Called from interrupt context.
2165 */
2166static void transport_task_timeout_handler(unsigned long data)
2167{
2168 struct se_task *task = (struct se_task *)data;
e3d6f909 2169 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2170 unsigned long flags;
2171
6708bb27 2172 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2173
a1d8b49a 2174 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2175 if (task->task_flags & TF_STOP) {
a1d8b49a 2176 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2177 return;
2178 }
2179 task->task_flags &= ~TF_RUNNING;
2180
2181 /*
2182 * Determine if transport_complete_task() has already been called.
2183 */
6708bb27
AG		 2184 if (!atomic_read(&task->task_active)) {
2185 pr_debug("transport task: %p cmd: %p timeout task_active"
c66ac9db 2186 " == 0\n", task, cmd);
a1d8b49a 2187 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2188 return;
2189 }
2190
a1d8b49a
AG		 2191 atomic_inc(&cmd->t_se_count);
2192 atomic_inc(&cmd->t_transport_timeout);
2193 cmd->t_tasks_failed = 1;
c66ac9db
NB		 2194
2195 atomic_set(&task->task_timeout, 1);
2196 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2197 task->task_scsi_status = 1;
2198
2199 if (atomic_read(&task->task_stop)) {
6708bb27 2200 pr_debug("transport task: %p cmd: %p timeout task_stop"
c66ac9db 2201 " == 1\n", task, cmd);
a1d8b49a 2202 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2203 complete(&task->task_stop_comp);
2204 return;
2205 }
2206
6708bb27
AG		 2207 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2208 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2209 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2210 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2211 return;
2212 }
6708bb27 2213 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2214 task, cmd);
2215
2216 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2217 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2218
2219 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2220}
2221
2222/*
a1d8b49a 2223 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2224 */
2225static void transport_start_task_timer(struct se_task *task)
2226{
2227 struct se_device *dev = task->se_dev;
2228 int timeout;
2229
2230 if (task->task_flags & TF_RUNNING)
2231 return;
2232 /*
2233 * If the task_timeout is disabled, exit now.
2234 */
e3d6f909 2235 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2236 if (!timeout)
c66ac9db
NB		 2237 return;
2238
2239 init_timer(&task->task_timer);
2240 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2241 task->task_timer.data = (unsigned long) task;
2242 task->task_timer.function = transport_task_timeout_handler;
2243
2244 task->task_flags |= TF_RUNNING;
2245 add_timer(&task->task_timer);
2246#if 0
6708bb27 2247 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
c66ac9db
NB		 2248 " %d\n", task->task_se_cmd, task, timeout);
2249#endif
2250}
2251
2252/*
a1d8b49a 2253 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2254 */
2255void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2256{
e3d6f909 2257 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db 2258
6708bb27 2259 if (!task->task_flags & TF_RUNNING)
c66ac9db
NB		 2260 return;
2261
2262 task->task_flags |= TF_STOP;
a1d8b49a 2263 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2264
2265 del_timer_sync(&task->task_timer);
2266
a1d8b49a 2267 spin_lock_irqsave(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2268 task->task_flags &= ~TF_RUNNING;
2269 task->task_flags &= ~TF_STOP;
2270}
2271
2272static void transport_stop_all_task_timers(struct se_cmd *cmd)
2273{
2274 struct se_task *task = NULL, *task_tmp;
2275 unsigned long flags;
2276
a1d8b49a 2277 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2278 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2279 &cmd->t_task_list, t_list)
c66ac9db 2280 __transport_stop_task_timer(task, &flags);
a1d8b49a 2281 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2282}
2283
2284static inline int transport_tcq_window_closed(struct se_device *dev)
2285{
2286 if (dev->dev_tcq_window_closed++ <
2287 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2288 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2289 } else
2290 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2291
e3d6f909 2292 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2293 return 0;
2294}
2295
2296/*
2297 * Called from Fabric Module context from transport_execute_tasks()
2298 *
2299 * The return of this function determins if the tasks from struct se_cmd
2300 * get added to the execution queue in transport_execute_tasks(),
2301 * or are added to the delayed or ordered lists here.
2302 */
2303static inline int transport_execute_task_attr(struct se_cmd *cmd)
2304{
5951146d 2305 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2306 return 1;
2307 /*
25985edc 2308 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2309 * to allow the passed struct se_cmd list of tasks to the front of the list.
2310 */
e66ecd50 2311 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2312 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2313 smp_mb__after_atomic_inc();
6708bb27 2314 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2315 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2316 cmd->t_task_cdb[0],
c66ac9db
NB		 2317 cmd->se_ordered_id);
2318 return 1;
e66ecd50 2319 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2320 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2321 list_add_tail(&cmd->se_ordered_node,
2322 &cmd->se_dev->ordered_cmd_list);
2323 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2324
5951146d 2325 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2326 smp_mb__after_atomic_inc();
2327
6708bb27 2328 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2329 " list, se_ordered_id: %u\n",
a1d8b49a 2330 cmd->t_task_cdb[0],
c66ac9db
NB		 2331 cmd->se_ordered_id);
2332 /*
2333 * Add ORDERED command to tail of execution queue if
2334 * no other older commands exist that need to be
2335 * completed first.
2336 */
6708bb27 2337 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2338 return 1;
2339 } else {
2340 /*
2341 * For SIMPLE and UNTAGGED Task Attribute commands
2342 */
5951146d 2343 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2344 smp_mb__after_atomic_inc();
2345 }
2346 /*
2347 * Otherwise if one or more outstanding ORDERED task attribute exist,
2348 * add the dormant task(s) built for the passed struct se_cmd to the
2349 * execution queue and become in Active state for this struct se_device.
2350 */
5951146d 2351 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2352 /*
2353 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2354 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2355 */
5951146d 2356 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2357 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2358 list_add_tail(&cmd->se_delayed_node,
2359 &cmd->se_dev->delayed_cmd_list);
2360 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2361
6708bb27 2362 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2363 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2364 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2365 cmd->se_ordered_id);
2366 /*
2367 * Return zero to let transport_execute_tasks() know
2368 * not to add the delayed tasks to the execution list.
2369 */
2370 return 0;
2371 }
2372 /*
2373 * Otherwise, no ORDERED task attributes exist..
2374 */
2375 return 1;
2376}
2377
2378/*
2379 * Called from fabric module context in transport_generic_new_cmd() and
2380 * transport_generic_process_write()
2381 */
2382static int transport_execute_tasks(struct se_cmd *cmd)
2383{
2384 int add_tasks;
2385
db1620a2
CH		 2386 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2387 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2388 transport_generic_request_failure(cmd, NULL, 0, 1);
2389 return 0;
c66ac9db 2390 }
db1620a2 2391
c66ac9db
NB		 2392 /*
2393 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2394 * has occurred that prevents execution.
c66ac9db 2395 */
6708bb27 2396 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2397 /*
2398 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2399 * attribute for the tasks of the received struct se_cmd CDB
2400 */
2401 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2402 if (!add_tasks)
c66ac9db
NB		 2403 goto execute_tasks;
2404 /*
2405 * This calls transport_add_tasks_from_cmd() to handle
2406 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2407 * (if enabled) in __transport_add_task_to_execute_queue() and
2408 * transport_add_task_check_sam_attr().
2409 */
2410 transport_add_tasks_from_cmd(cmd);
2411 }
2412 /*
2413 * Kick the execution queue for the cmd associated struct se_device
2414 * storage object.
2415 */
2416execute_tasks:
5951146d 2417 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2418 return 0;
2419}
2420
2421/*
2422 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2423 * from struct se_device->execute_task_list and
2424 *
2425 * Called from transport_processing_thread()
2426 */
2427static int __transport_execute_tasks(struct se_device *dev)
2428{
2429 int error;
2430 struct se_cmd *cmd = NULL;
e3d6f909 2431 struct se_task *task = NULL;
c66ac9db
NB		 2432 unsigned long flags;
2433
2434 /*
2435 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2436 * struct se_tasks to the selected transport.
c66ac9db
NB		 2437 */
2438check_depth:
e3d6f909 2439 if (!atomic_read(&dev->depth_left))
c66ac9db 2440 return transport_tcq_window_closed(dev);
c66ac9db 2441
e3d6f909 2442 dev->dev_tcq_window_closed = 0;
c66ac9db 2443
e3d6f909
AG		 2444 spin_lock_irq(&dev->execute_task_lock);
2445 if (list_empty(&dev->execute_task_list)) {
2446 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2447 return 0;
2448 }
e3d6f909
AG		 2449 task = list_first_entry(&dev->execute_task_list,
2450 struct se_task, t_execute_list);
2451 list_del(&task->t_execute_list);
2452 atomic_set(&task->task_execute_queue, 0);
2453 atomic_dec(&dev->execute_tasks);
2454 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2455
2456 atomic_dec(&dev->depth_left);
c66ac9db 2457
e3d6f909 2458 cmd = task->task_se_cmd;
c66ac9db 2459
a1d8b49a 2460 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2461 atomic_set(&task->task_active, 1);
2462 atomic_set(&task->task_sent, 1);
a1d8b49a 2463 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2464
a1d8b49a
AG		 2465 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2466 cmd->t_task_list_num)
c66ac9db
NB		 2467 atomic_set(&cmd->transport_sent, 1);
2468
2469 transport_start_task_timer(task);
a1d8b49a 2470 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2471 /*
2472 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2473 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2474 * struct se_subsystem_api->do_task() caller below.
2475 */
2476 if (cmd->transport_emulate_cdb) {
2477 error = cmd->transport_emulate_cdb(cmd);
2478 if (error != 0) {
2479 cmd->transport_error_status = error;
2480 atomic_set(&task->task_active, 0);
2481 atomic_set(&cmd->transport_sent, 0);
2482 transport_stop_tasks_for_cmd(cmd);
2483 transport_generic_request_failure(cmd, dev, 0, 1);
2484 goto check_depth;
2485 }
2486 /*
2487 * Handle the successful completion for transport_emulate_cdb()
2488 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2489 * Otherwise the caller is expected to complete the task with
2490 * proper status.
2491 */
2492 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2493 cmd->scsi_status = SAM_STAT_GOOD;
2494 task->task_scsi_status = GOOD;
2495 transport_complete_task(task, 1);
2496 }
2497 } else {
2498 /*
2499 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2500 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2501 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2502 * LUN emulation code.
2503 *
2504 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2505 * call ->do_task() directly and let the underlying TCM subsystem plugin
2506 * code handle the CDB emulation.
2507 */
e3d6f909
AG		 2508 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2509 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2510 error = transport_emulate_control_cdb(task);
2511 else
e3d6f909 2512 error = dev->transport->do_task(task);
c66ac9db
NB		 2513
2514 if (error != 0) {
2515 cmd->transport_error_status = error;
2516 atomic_set(&task->task_active, 0);
2517 atomic_set(&cmd->transport_sent, 0);
2518 transport_stop_tasks_for_cmd(cmd);
2519 transport_generic_request_failure(cmd, dev, 0, 1);
2520 }
2521 }
2522
2523 goto check_depth;
2524
2525 return 0;
2526}
2527
2528void transport_new_cmd_failure(struct se_cmd *se_cmd)
2529{
2530 unsigned long flags;
2531 /*
2532 * Any unsolicited data will get dumped for failed command inside of
2533 * the fabric plugin
2534 */
a1d8b49a 2535 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2536 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2537 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2538 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2539}
2540
2541static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2542
2543static inline u32 transport_get_sectors_6(
2544 unsigned char *cdb,
2545 struct se_cmd *cmd,
2546 int *ret)
2547{
5951146d 2548 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2549
2550 /*
2551 * Assume TYPE_DISK for non struct se_device objects.
2552 * Use 8-bit sector value.
2553 */
2554 if (!dev)
2555 goto type_disk;
2556
2557 /*
2558 * Use 24-bit allocation length for TYPE_TAPE.
2559 */
e3d6f909 2560 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2561 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2562
2563 /*
2564 * Everything else assume TYPE_DISK Sector CDB location.
2565 * Use 8-bit sector value.
2566 */
2567type_disk:
2568 return (u32)cdb[4];
2569}
2570
2571static inline u32 transport_get_sectors_10(
2572 unsigned char *cdb,
2573 struct se_cmd *cmd,
2574 int *ret)
2575{
5951146d 2576 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2577
2578 /*
2579 * Assume TYPE_DISK for non struct se_device objects.
2580 * Use 16-bit sector value.
2581 */
2582 if (!dev)
2583 goto type_disk;
2584
2585 /*
2586 * XXX_10 is not defined in SSC, throw an exception
2587 */
e3d6f909
AG		 2588 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2589 *ret = -EINVAL;
c66ac9db
NB		 2590 return 0;
2591 }
2592
2593 /*
2594 * Everything else assume TYPE_DISK Sector CDB location.
2595 * Use 16-bit sector value.
2596 */
2597type_disk:
2598 return (u32)(cdb[7] << 8) + cdb[8];
2599}
2600
2601static inline u32 transport_get_sectors_12(
2602 unsigned char *cdb,
2603 struct se_cmd *cmd,
2604 int *ret)
2605{
5951146d 2606 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2607
2608 /*
2609 * Assume TYPE_DISK for non struct se_device objects.
2610 * Use 32-bit sector value.
2611 */
2612 if (!dev)
2613 goto type_disk;
2614
2615 /*
2616 * XXX_12 is not defined in SSC, throw an exception
2617 */
e3d6f909
AG		 2618 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2619 *ret = -EINVAL;
c66ac9db
NB		 2620 return 0;
2621 }
2622
2623 /*
2624 * Everything else assume TYPE_DISK Sector CDB location.
2625 * Use 32-bit sector value.
2626 */
2627type_disk:
2628 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2629}
2630
2631static inline u32 transport_get_sectors_16(
2632 unsigned char *cdb,
2633 struct se_cmd *cmd,
2634 int *ret)
2635{
5951146d 2636 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2637
2638 /*
2639 * Assume TYPE_DISK for non struct se_device objects.
2640 * Use 32-bit sector value.
2641 */
2642 if (!dev)
2643 goto type_disk;
2644
2645 /*
2646 * Use 24-bit allocation length for TYPE_TAPE.
2647 */
e3d6f909 2648 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2649 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2650
2651type_disk:
2652 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2653 (cdb[12] << 8) + cdb[13];
2654}
2655
2656/*
2657 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2658 */
2659static inline u32 transport_get_sectors_32(
2660 unsigned char *cdb,
2661 struct se_cmd *cmd,
2662 int *ret)
2663{
2664 /*
2665 * Assume TYPE_DISK for non struct se_device objects.
2666 * Use 32-bit sector value.
2667 */
2668 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2669 (cdb[30] << 8) + cdb[31];
2670
2671}
2672
2673static inline u32 transport_get_size(
2674 u32 sectors,
2675 unsigned char *cdb,
2676 struct se_cmd *cmd)
2677{
5951146d 2678 struct se_device *dev = cmd->se_dev;
c66ac9db 2679
e3d6f909 2680 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2681 if (cdb[1] & 1) { /* sectors */
e3d6f909 2682 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2683 } else /* bytes */
2684 return sectors;
2685 }
2686#if 0
6708bb27 2687 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2688 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2689 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2690 dev->transport->name);
c66ac9db 2691#endif
e3d6f909 2692 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2693}
2694
c66ac9db
NB		 2695static void transport_xor_callback(struct se_cmd *cmd)
2696{
2697 unsigned char *buf, *addr;
ec98f782 2698 struct scatterlist *sg;
c66ac9db
NB		 2699 unsigned int offset;
2700 int i;
ec98f782 2701 int count;
c66ac9db
NB		 2702 /*
2703 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2704 *
2705 * 1) read the specified logical block(s);
2706 * 2) transfer logical blocks from the data-out buffer;
2707 * 3) XOR the logical blocks transferred from the data-out buffer with
2708 * the logical blocks read, storing the resulting XOR data in a buffer;
2709 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2710 * blocks transferred from the data-out buffer; and
2711 * 5) transfer the resulting XOR data to the data-in buffer.
2712 */
2713 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2714 if (!buf) {
2715 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2716 return;
2717 }
2718 /*
ec98f782 2719 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2720 * into the locally allocated *buf
2721 */
ec98f782
AG		 2722 sg_copy_to_buffer(cmd->t_data_sg,
2723 cmd->t_data_nents,
2724 buf,
2725 cmd->data_length);
2726
c66ac9db
NB		 2727 /*
2728 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2729 * cmd->t_mem_bidi_list
c66ac9db
NB		 2730 */
2731
2732 offset = 0;
ec98f782
AG		 2733 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2734 addr = kmap_atomic(sg_page(sg), KM_USER0);
2735 if (!addr)
c66ac9db
NB		 2736 goto out;
2737
ec98f782
AG		 2738 for (i = 0; i < sg->length; i++)
2739 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2740
ec98f782 2741 offset += sg->length;
c66ac9db
NB		 2742 kunmap_atomic(addr, KM_USER0);
2743 }
ec98f782 2744
c66ac9db
NB		 2745out:
2746 kfree(buf);
2747}
2748
2749/*
2750 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2751 */
2752static int transport_get_sense_data(struct se_cmd *cmd)
2753{
2754 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2755 struct se_device *dev;
2756 struct se_task *task = NULL, *task_tmp;
2757 unsigned long flags;
2758 u32 offset = 0;
2759
e3d6f909
AG		 2760 WARN_ON(!cmd->se_lun);
2761
a1d8b49a 2762 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2763 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2764 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2765 return 0;
2766 }
2767
2768 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2769 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2770
2771 if (!task->task_sense)
2772 continue;
2773
2774 dev = task->se_dev;
6708bb27 2775 if (!dev)
c66ac9db
NB		 2776 continue;
2777
e3d6f909 2778 if (!dev->transport->get_sense_buffer) {
6708bb27 2779 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2780 " is NULL\n");
2781 continue;
2782 }
2783
e3d6f909 2784 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27
AG		 2785 if (!sense_buffer) {
2786 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
c66ac9db 2787 " sense buffer for task with sense\n",
e3d6f909 2788 cmd->se_tfo->get_task_tag(cmd), task->task_no);
c66ac9db
NB		 2789 continue;
2790 }
a1d8b49a 2791 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2792
e3d6f909 2793 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2794 TRANSPORT_SENSE_BUFFER);
2795
5951146d 2796 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2797 TRANSPORT_SENSE_BUFFER);
2798 cmd->scsi_status = task->task_scsi_status;
2799 /* Automatically padded */
2800 cmd->scsi_sense_length =
2801 (TRANSPORT_SENSE_BUFFER + offset);
2802
6708bb27 2803 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2804 " and sense\n",
e3d6f909 2805 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2806 cmd->scsi_status);
2807 return 0;
2808 }
a1d8b49a 2809 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2810
2811 return -1;
2812}
2813
c66ac9db
NB		 2814static int
2815transport_handle_reservation_conflict(struct se_cmd *cmd)
2816{
2817 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2818 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2819 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2820 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2821 /*
2822 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2823 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2824 * CONFLICT STATUS.
2825 *
2826 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2827 */
e3d6f909
AG		 2828 if (cmd->se_sess &&
2829 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2830 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2831 cmd->orig_fe_lun, 0x2C,
2832 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2833 return -EINVAL;
c66ac9db
NB		 2834}
2835
ec98f782
AG		 2836static inline long long transport_dev_end_lba(struct se_device *dev)
2837{
2838 return dev->transport->get_blocks(dev) + 1;
2839}
2840
2841static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2842{
2843 struct se_device *dev = cmd->se_dev;
2844 u32 sectors;
2845
2846 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2847 return 0;
2848
2849 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2850
6708bb27
AG		 2851 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2852 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2853 " transport_dev_end_lba(): %llu\n",
2854 cmd->t_task_lba, sectors,
2855 transport_dev_end_lba(dev));
6708bb27 2856 pr_err(" We should return CHECK_CONDITION"
ec98f782
AG		 2857 " but we don't yet\n");
2858 return 0;
2859 }
2860
2861 return sectors;
2862}
2863
c66ac9db
NB		 2864/* transport_generic_cmd_sequencer():
2865 *
2866 * Generic Command Sequencer that should work for most DAS transport
2867 * drivers.
2868 *
2869 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2870 * RX Thread.
2871 *
2872 * FIXME: Need to support other SCSI OPCODES where as well.
2873 */
2874static int transport_generic_cmd_sequencer(
2875 struct se_cmd *cmd,
2876 unsigned char *cdb)
2877{
5951146d 2878 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2879 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2880 int ret = 0, sector_ret = 0, passthrough;
2881 u32 sectors = 0, size = 0, pr_reg_type = 0;
2882 u16 service_action;
2883 u8 alua_ascq = 0;
2884 /*
2885 * Check for an existing UNIT ATTENTION condition
2886 */
2887 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2888 cmd->transport_wait_for_tasks =
2889 &transport_nop_wait_for_tasks;
2890 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2891 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2892 return -EINVAL;
c66ac9db
NB		 2893 }
2894 /*
2895 * Check status of Asymmetric Logical Unit Assignment port
2896 */
e3d6f909 2897 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db
NB		 2898 if (ret != 0) {
2899 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2900 /*
25985edc 2901 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2902 * The ALUA additional sense code qualifier (ASCQ) is determined
2903 * by the ALUA primary or secondary access state..
2904 */
2905 if (ret > 0) {
2906#if 0
6708bb27 2907 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2908 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2909 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2910#endif
2911 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2912 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2913 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2914 return -EINVAL;
c66ac9db
NB		 2915 }
2916 goto out_invalid_cdb_field;
2917 }
2918 /*
2919 * Check status for SPC-3 Persistent Reservations
2920 */
e3d6f909
AG		 2921 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2922 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2923 cmd, cdb, pr_reg_type) != 0)
2924 return transport_handle_reservation_conflict(cmd);
2925 /*
2926 * This means the CDB is allowed for the SCSI Initiator port
2927 * when said port is *NOT* holding the legacy SPC-2 or
2928 * SPC-3 Persistent Reservation.
2929 */
2930 }
2931
2932 switch (cdb[0]) {
2933 case READ_6:
2934 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2935 if (sector_ret)
2936 goto out_unsupported_cdb;
2937 size = transport_get_size(sectors, cdb, cmd);
2938 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2939 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2940 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2941 break;
2942 case READ_10:
2943 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2944 if (sector_ret)
2945 goto out_unsupported_cdb;
2946 size = transport_get_size(sectors, cdb, cmd);
2947 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 2948 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2949 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2950 break;
2951 case READ_12:
2952 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2953 if (sector_ret)
2954 goto out_unsupported_cdb;
2955 size = transport_get_size(sectors, cdb, cmd);
2956 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a 2957 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2958 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2959 break;
2960 case READ_16:
2961 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2962 if (sector_ret)
2963 goto out_unsupported_cdb;
2964 size = transport_get_size(sectors, cdb, cmd);
2965 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a 2966 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2967 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2968 break;
2969 case WRITE_6:
2970 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2971 if (sector_ret)
2972 goto out_unsupported_cdb;
2973 size = transport_get_size(sectors, cdb, cmd);
2974 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2975 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2976 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2977 break;
2978 case WRITE_10:
2979 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2980 if (sector_ret)
2981 goto out_unsupported_cdb;
2982 size = transport_get_size(sectors, cdb, cmd);
2983 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a
AG		 2984 cmd->t_task_lba = transport_lba_32(cdb);
2985 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2986 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2987 break;
2988 case WRITE_12:
2989 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2990 if (sector_ret)
2991 goto out_unsupported_cdb;
2992 size = transport_get_size(sectors, cdb, cmd);
2993 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a
AG		 2994 cmd->t_task_lba = transport_lba_32(cdb);
2995 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2996 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2997 break;
2998 case WRITE_16:
2999 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3000 if (sector_ret)
3001 goto out_unsupported_cdb;
3002 size = transport_get_size(sectors, cdb, cmd);
3003 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a
AG		 3004 cmd->t_task_lba = transport_lba_64(cdb);
3005 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3006 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3007 break;
3008 case XDWRITEREAD_10:
3009 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 3010 !(cmd->t_tasks_bidi))
c66ac9db
NB		 3011 goto out_invalid_cdb_field;
3012 sectors = transport_get_sectors_10(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_10;
a1d8b49a 3017 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 3018 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 3019 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3020 TRANSPORT_PLUGIN_PHBA_PDEV);
3021 /*
3022 * Skip the remaining assignments for TCM/PSCSI passthrough
3023 */
3024 if (passthrough)
3025 break;
3026 /*
3027 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3028 */
3029 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3030 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3031 break;
3032 case VARIABLE_LENGTH_CMD:
3033 service_action = get_unaligned_be16(&cdb[8]);
3034 /*
3035 * Determine if this is TCM/PSCSI device and we should disable
3036 * internal emulation for this CDB.
3037 */
e3d6f909 3038 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3039 TRANSPORT_PLUGIN_PHBA_PDEV);
3040
3041 switch (service_action) {
3042 case XDWRITEREAD_32:
3043 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3044 if (sector_ret)
3045 goto out_unsupported_cdb;
3046 size = transport_get_size(sectors, cdb, cmd);
3047 /*
3048 * Use WRITE_32 and READ_32 opcodes for the emulated
3049 * XDWRITE_READ_32 logic.
3050 */
3051 cmd->transport_split_cdb = &split_cdb_XX_32;
a1d8b49a 3052 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 3053 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3054
3055 /*
3056 * Skip the remaining assignments for TCM/PSCSI passthrough
3057 */
3058 if (passthrough)
3059 break;
3060
3061 /*
3062 * Setup BIDI XOR callback to be run during
3063 * transport_generic_complete_ok()
3064 */
3065 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3066 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 3067 break;
3068 case WRITE_SAME_32:
3069 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3070 if (sector_ret)
3071 goto out_unsupported_cdb;
dd3a5ad8 3072
6708bb27 3073 if (sectors)
dd3a5ad8 3074 size = transport_get_size(sectors, cdb, cmd);
6708bb27
AG		 3075 else {
3076 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3077 " supported\n");
3078 goto out_invalid_cdb_field;
3079 }
dd3a5ad8 3080
a1d8b49a 3081 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 3082 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3083
3084 /*
3085 * Skip the remaining assignments for TCM/PSCSI passthrough
3086 */
3087 if (passthrough)
3088 break;
3089
3090 if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) {
6708bb27 3091 pr_err("WRITE_SAME PBDATA and LBDATA"
c66ac9db
NB		 3092 " bits not supported for Block Discard"
3093 " Emulation\n");
3094 goto out_invalid_cdb_field;
3095 }
3096 /*
3097 * Currently for the emulated case we only accept
3098 * tpws with the UNMAP=1 bit set.
3099 */
3100 if (!(cdb[10] & 0x08)) {
6708bb27 3101 pr_err("WRITE_SAME w/o UNMAP bit not"
c66ac9db
NB		 3102 " supported for Block Discard Emulation\n");
3103 goto out_invalid_cdb_field;
3104 }
3105 break;
3106 default:
6708bb27 3107 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 3108 " 0x%04x not supported\n", service_action);
3109 goto out_unsupported_cdb;
3110 }
3111 break;
e434f1f1 3112 case MAINTENANCE_IN:
e3d6f909 3113 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3114 /* MAINTENANCE_IN from SCC-2 */
3115 /*
3116 * Check for emulated MI_REPORT_TARGET_PGS.
3117 */
3118 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3119 cmd->transport_emulate_cdb =
e3d6f909 3120 (su_dev->t10_alua.alua_type ==
c66ac9db 3121 SPC3_ALUA_EMULATED) ?
e3d6f909 3122 core_emulate_report_target_port_groups :
c66ac9db
NB		 3123 NULL;
3124 }
3125 size = (cdb[6] << 24) | (cdb[7] << 16) |
3126 (cdb[8] << 8) | cdb[9];
3127 } else {
3128 /* GPCMD_SEND_KEY from multi media commands */
3129 size = (cdb[8] << 8) + cdb[9];
3130 }
05d1c7c0 3131 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3132 break;
3133 case MODE_SELECT:
3134 size = cdb[4];
3135 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3136 break;
3137 case MODE_SELECT_10:
3138 size = (cdb[7] << 8) + cdb[8];
3139 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3140 break;
3141 case MODE_SENSE:
3142 size = cdb[4];
05d1c7c0 3143 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3144 break;
3145 case MODE_SENSE_10:
3146 case GPCMD_READ_BUFFER_CAPACITY:
3147 case GPCMD_SEND_OPC:
3148 case LOG_SELECT:
3149 case LOG_SENSE:
3150 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3151 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3152 break;
3153 case READ_BLOCK_LIMITS:
3154 size = READ_BLOCK_LEN;
05d1c7c0 3155 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3156 break;
3157 case GPCMD_GET_CONFIGURATION:
3158 case GPCMD_READ_FORMAT_CAPACITIES:
3159 case GPCMD_READ_DISC_INFO:
3160 case GPCMD_READ_TRACK_RZONE_INFO:
3161 size = (cdb[7] << 8) + cdb[8];
3162 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3163 break;
3164 case PERSISTENT_RESERVE_IN:
3165 case PERSISTENT_RESERVE_OUT:
3166 cmd->transport_emulate_cdb =
e3d6f909 3167 (su_dev->t10_pr.res_type ==
c66ac9db 3168 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3169 core_scsi3_emulate_pr : NULL;
c66ac9db 3170 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3171 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3172 break;
3173 case GPCMD_MECHANISM_STATUS:
3174 case GPCMD_READ_DVD_STRUCTURE:
3175 size = (cdb[8] << 8) + cdb[9];
3176 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3177 break;
3178 case READ_POSITION:
3179 size = READ_POSITION_LEN;
05d1c7c0 3180 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3181 break;
e434f1f1 3182 case MAINTENANCE_OUT:
e3d6f909 3183 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3184 /* MAINTENANCE_OUT from SCC-2
3185 *
3186 * Check for emulated MO_SET_TARGET_PGS.
3187 */
3188 if (cdb[1] == MO_SET_TARGET_PGS) {
3189 cmd->transport_emulate_cdb =
e3d6f909 3190 (su_dev->t10_alua.alua_type ==
c66ac9db 3191 SPC3_ALUA_EMULATED) ?
e3d6f909 3192 core_emulate_set_target_port_groups :
c66ac9db
NB		 3193 NULL;
3194 }
3195
3196 size = (cdb[6] << 24) | (cdb[7] << 16) |
3197 (cdb[8] << 8) | cdb[9];
3198 } else {
3199 /* GPCMD_REPORT_KEY from multi media commands */
3200 size = (cdb[8] << 8) + cdb[9];
3201 }
05d1c7c0 3202 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3203 break;
3204 case INQUIRY:
3205 size = (cdb[3] << 8) + cdb[4];
3206 /*
3207 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3208 * See spc4r17 section 5.3
3209 */
5951146d 3210 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3211 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3212 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3213 break;
3214 case READ_BUFFER:
3215 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3216 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3217 break;
3218 case READ_CAPACITY:
3219 size = READ_CAP_LEN;
05d1c7c0 3220 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3221 break;
3222 case READ_MEDIA_SERIAL_NUMBER:
3223 case SECURITY_PROTOCOL_IN:
3224 case SECURITY_PROTOCOL_OUT:
3225 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3226 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3227 break;
3228 case SERVICE_ACTION_IN:
3229 case ACCESS_CONTROL_IN:
3230 case ACCESS_CONTROL_OUT:
3231 case EXTENDED_COPY:
3232 case READ_ATTRIBUTE:
3233 case RECEIVE_COPY_RESULTS:
3234 case WRITE_ATTRIBUTE:
3235 size = (cdb[10] << 24) | (cdb[11] << 16) |
3236 (cdb[12] << 8) | cdb[13];
05d1c7c0 3237 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3238 break;
3239 case RECEIVE_DIAGNOSTIC:
3240 case SEND_DIAGNOSTIC:
3241 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3242 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3243 break;
3244/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3245#if 0
3246 case GPCMD_READ_CD:
3247 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3248 size = (2336 * sectors);
05d1c7c0 3249 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3250 break;
3251#endif
3252 case READ_TOC:
3253 size = cdb[8];
05d1c7c0 3254 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3255 break;
3256 case REQUEST_SENSE:
3257 size = cdb[4];
05d1c7c0 3258 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3259 break;
3260 case READ_ELEMENT_STATUS:
3261 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3262 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3263 break;
3264 case WRITE_BUFFER:
3265 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3266 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3267 break;
3268 case RESERVE:
3269 case RESERVE_10:
3270 /*
3271 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3272 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3273 */
3274 if (cdb[0] == RESERVE_10)
3275 size = (cdb[7] << 8) | cdb[8];
3276 else
3277 size = cmd->data_length;
3278
3279 /*
3280 * Setup the legacy emulated handler for SPC-2 and
3281 * >= SPC-3 compatible reservation handling (CRH=1)
3282 * Otherwise, we assume the underlying SCSI logic is
3283 * is running in SPC_PASSTHROUGH, and wants reservations
3284 * emulation disabled.
3285 */
3286 cmd->transport_emulate_cdb =
e3d6f909 3287 (su_dev->t10_pr.res_type !=
c66ac9db 3288 SPC_PASSTHROUGH) ?
e3d6f909 3289 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3290 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3291 break;
3292 case RELEASE:
3293 case RELEASE_10:
3294 /*
3295 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3296 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3297 */
3298 if (cdb[0] == RELEASE_10)
3299 size = (cdb[7] << 8) | cdb[8];
3300 else
3301 size = cmd->data_length;
3302
3303 cmd->transport_emulate_cdb =
e3d6f909 3304 (su_dev->t10_pr.res_type !=
c66ac9db 3305 SPC_PASSTHROUGH) ?
e3d6f909 3306 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3307 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3308 break;
3309 case SYNCHRONIZE_CACHE:
3310 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3311 /*
3312 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3313 */
3314 if (cdb[0] == SYNCHRONIZE_CACHE) {
3315 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3316 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3317 } else {
3318 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3319 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3320 }
3321 if (sector_ret)
3322 goto out_unsupported_cdb;
3323
3324 size = transport_get_size(sectors, cdb, cmd);
3325 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3326
3327 /*
3328 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3329 */
e3d6f909 3330 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3331 break;
3332 /*
3333 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3334 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3335 */
3336 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3337 /*
3338 * Check to ensure that LBA + Range does not exceed past end of
3339 * device.
3340 */
a1d8b49a 3341 if (!transport_cmd_get_valid_sectors(cmd))
c66ac9db
NB		 3342 goto out_invalid_cdb_field;
3343 break;
3344 case UNMAP:
3345 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3346 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3347 break;
3348 case WRITE_SAME_16:
3349 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3350 if (sector_ret)
3351 goto out_unsupported_cdb;
dd3a5ad8 3352
6708bb27 3353 if (sectors)
dd3a5ad8 3354 size = transport_get_size(sectors, cdb, cmd);
6708bb27
AG		 3355 else {
3356 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3357 goto out_invalid_cdb_field;
3358 }
dd3a5ad8 3359
5db0753b 3360 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
e3d6f909 3361 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3362 TRANSPORT_PLUGIN_PHBA_PDEV);
3363 /*
3364 * Determine if the received WRITE_SAME_16 is used to for direct
3365 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3366 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3367 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3368 * TCM/FILEIO subsystem plugin backstores.
3369 */
6708bb27 3370 if (!passthrough) {
c66ac9db 3371 if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) {
6708bb27 3372 pr_err("WRITE_SAME PBDATA and LBDATA"
c66ac9db
NB		 3373 " bits not supported for Block Discard"
3374 " Emulation\n");
3375 goto out_invalid_cdb_field;
3376 }
3377 /*
3378 * Currently for the emulated case we only accept
3379 * tpws with the UNMAP=1 bit set.
3380 */
3381 if (!(cdb[1] & 0x08)) {
6708bb27 3382 pr_err("WRITE_SAME w/o UNMAP bit not "
c66ac9db
NB		 3383 " supported for Block Discard Emulation\n");
3384 goto out_invalid_cdb_field;
3385 }
3386 }
3387 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3388 break;
3389 case ALLOW_MEDIUM_REMOVAL:
3390 case GPCMD_CLOSE_TRACK:
3391 case ERASE:
3392 case INITIALIZE_ELEMENT_STATUS:
3393 case GPCMD_LOAD_UNLOAD:
3394 case REZERO_UNIT:
3395 case SEEK_10:
3396 case GPCMD_SET_SPEED:
3397 case SPACE:
3398 case START_STOP:
3399 case TEST_UNIT_READY:
3400 case VERIFY:
3401 case WRITE_FILEMARKS:
3402 case MOVE_MEDIUM:
3403 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3404 break;
3405 case REPORT_LUNS:
3406 cmd->transport_emulate_cdb =
e3d6f909 3407 transport_core_report_lun_response;
c66ac9db
NB		 3408 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3409 /*
3410 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3411 * See spc4r17 section 5.3
3412 */
5951146d 3413 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3414 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3415 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3416 break;
3417 default:
6708bb27 3418 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3419 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3420 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3421 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3422 goto out_unsupported_cdb;
3423 }
3424
3425 if (size != cmd->data_length) {
6708bb27 3426 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3427 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3428 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3429 cmd->data_length, size, cdb[0]);
3430
3431 cmd->cmd_spdtl = size;
3432
3433 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3434 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3435 " WRITE data\n");
3436 goto out_invalid_cdb_field;
3437 }
3438 /*
3439 * Reject READ_* or WRITE_* with overflow/underflow for
3440 * type SCF_SCSI_DATA_SG_IO_CDB.
3441 */
6708bb27
AG		 3442 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3443 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3444 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3445 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3446 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3447 goto out_invalid_cdb_field;
3448 }
3449
3450 if (size > cmd->data_length) {
3451 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3452 cmd->residual_count = (size - cmd->data_length);
3453 } else {
3454 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3455 cmd->residual_count = (cmd->data_length - size);
3456 }
3457 cmd->data_length = size;
3458 }
3459
d0229ae3
AG		 3460 /* Let's limit control cdbs to a page, for simplicity's sake. */
3461 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3462 size > PAGE_SIZE)
3463 goto out_invalid_cdb_field;
3464
c66ac9db
NB		 3465 transport_set_supported_SAM_opcode(cmd);
3466 return ret;
3467
3468out_unsupported_cdb:
3469 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3470 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3471 return -EINVAL;
c66ac9db
NB		 3472out_invalid_cdb_field:
3473 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3474 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3475 return -EINVAL;
c66ac9db
NB		 3476}
3477
c66ac9db
NB		 3478/*
3479 * Called from transport_generic_complete_ok() and
3480 * transport_generic_request_failure() to determine which dormant/delayed
3481 * and ordered cmds need to have their tasks added to the execution queue.
3482 */
3483static void transport_complete_task_attr(struct se_cmd *cmd)
3484{
5951146d 3485 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3486 struct se_cmd *cmd_p, *cmd_tmp;
3487 int new_active_tasks = 0;
3488
e66ecd50 3489 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3490 atomic_dec(&dev->simple_cmds);
3491 smp_mb__after_atomic_dec();
3492 dev->dev_cur_ordered_id++;
6708bb27 3493 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3494 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3495 cmd->se_ordered_id);
e66ecd50 3496 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3497 atomic_dec(&dev->dev_hoq_count);
3498 smp_mb__after_atomic_dec();
3499 dev->dev_cur_ordered_id++;
6708bb27 3500 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3501 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3502 cmd->se_ordered_id);
e66ecd50 3503 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3504 spin_lock(&dev->ordered_cmd_lock);
5951146d 3505 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3506 atomic_dec(&dev->dev_ordered_sync);
3507 smp_mb__after_atomic_dec();
3508 spin_unlock(&dev->ordered_cmd_lock);
3509
3510 dev->dev_cur_ordered_id++;
6708bb27 3511 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3512 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3513 }
3514 /*
3515 * Process all commands up to the last received
3516 * ORDERED task attribute which requires another blocking
3517 * boundary
3518 */
3519 spin_lock(&dev->delayed_cmd_lock);
3520 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3521 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3522
5951146d 3523 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3524 spin_unlock(&dev->delayed_cmd_lock);
3525
6708bb27 3526 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3527 " cmd_p: 0x%02x Task Attr: 0x%02x"
3528 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3529 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3530 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3531
3532 transport_add_tasks_from_cmd(cmd_p);
3533 new_active_tasks++;
3534
3535 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3536 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3537 break;
3538 }
3539 spin_unlock(&dev->delayed_cmd_lock);
3540 /*
3541 * If new tasks have become active, wake up the transport thread
3542 * to do the processing of the Active tasks.
3543 */
3544 if (new_active_tasks != 0)
e3d6f909 3545 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3546}
3547
07bde79a
NB		 3548static int transport_complete_qf(struct se_cmd *cmd)
3549{
3550 int ret = 0;
3551
3552 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
3553 return cmd->se_tfo->queue_status(cmd);
3554
3555 switch (cmd->data_direction) {
3556 case DMA_FROM_DEVICE:
3557 ret = cmd->se_tfo->queue_data_in(cmd);
3558 break;
3559 case DMA_TO_DEVICE:
ec98f782 3560 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3561 ret = cmd->se_tfo->queue_data_in(cmd);
3562 if (ret < 0)
3563 return ret;
3564 }
3565 /* Fall through for DMA_TO_DEVICE */
3566 case DMA_NONE:
3567 ret = cmd->se_tfo->queue_status(cmd);
3568 break;
3569 default:
3570 break;
3571 }
3572
3573 return ret;
3574}
3575
3576static void transport_handle_queue_full(
3577 struct se_cmd *cmd,
3578 struct se_device *dev,
3579 int (*qf_callback)(struct se_cmd *))
3580{
3581 spin_lock_irq(&dev->qf_cmd_lock);
3582 cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL;
3583 cmd->transport_qf_callback = qf_callback;
3584 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3585 atomic_inc(&dev->dev_qf_count);
3586 smp_mb__after_atomic_inc();
3587 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3588
3589 schedule_work(&cmd->se_dev->qf_work_queue);
3590}
3591
c66ac9db
NB		 3592static void transport_generic_complete_ok(struct se_cmd *cmd)
3593{
07bde79a 3594 int reason = 0, ret;
c66ac9db
NB		 3595 /*
3596 * Check if we need to move delayed/dormant tasks from cmds on the
3597 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3598 * Attribute.
3599 */
5951146d 3600 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3601 transport_complete_task_attr(cmd);
07bde79a
NB		 3602 /*
3603 * Check to schedule QUEUE_FULL work, or execute an existing
3604 * cmd->transport_qf_callback()
3605 */
3606 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3607 schedule_work(&cmd->se_dev->qf_work_queue);
3608
3609 if (cmd->transport_qf_callback) {
3610 ret = cmd->transport_qf_callback(cmd);
3611 if (ret < 0)
3612 goto queue_full;
3613
3614 cmd->transport_qf_callback = NULL;
3615 goto done;
3616 }
c66ac9db
NB		 3617 /*
3618 * Check if we need to retrieve a sense buffer from
3619 * the struct se_cmd in question.
3620 */
3621 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3622 if (transport_get_sense_data(cmd) < 0)
3623 reason = TCM_NON_EXISTENT_LUN;
3624
3625 /*
3626 * Only set when an struct se_task->task_scsi_status returned
3627 * a non GOOD status.
3628 */
3629 if (cmd->scsi_status) {
07bde79a 3630 ret = transport_send_check_condition_and_sense(
c66ac9db 3631 cmd, reason, 1);
07bde79a
NB		 3632 if (ret == -EAGAIN)
3633 goto queue_full;
3634
c66ac9db
NB		 3635 transport_lun_remove_cmd(cmd);
3636 transport_cmd_check_stop_to_fabric(cmd);
3637 return;
3638 }
3639 }
3640 /*
25985edc 3641 * Check for a callback, used by amongst other things
c66ac9db
NB		 3642 * XDWRITE_READ_10 emulation.
3643 */
3644 if (cmd->transport_complete_callback)
3645 cmd->transport_complete_callback(cmd);
3646
3647 switch (cmd->data_direction) {
3648 case DMA_FROM_DEVICE:
3649 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3650 if (cmd->se_lun->lun_sep) {
3651 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3652 cmd->data_length;
3653 }
3654 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3655
07bde79a
NB		 3656 ret = cmd->se_tfo->queue_data_in(cmd);
3657 if (ret == -EAGAIN)
3658 goto queue_full;
c66ac9db
NB		 3659 break;
3660 case DMA_TO_DEVICE:
3661 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3662 if (cmd->se_lun->lun_sep) {
3663 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3664 cmd->data_length;
3665 }
3666 spin_unlock(&cmd->se_lun->lun_sep_lock);
3667 /*
3668 * Check if we need to send READ payload for BIDI-COMMAND
3669 */
ec98f782 3670 if (cmd->t_bidi_data_sg) {
c66ac9db 3671 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3672 if (cmd->se_lun->lun_sep) {
3673 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3674 cmd->data_length;
3675 }
3676 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3677 ret = cmd->se_tfo->queue_data_in(cmd);
3678 if (ret == -EAGAIN)
3679 goto queue_full;
c66ac9db
NB		 3680 break;
3681 }
3682 /* Fall through for DMA_TO_DEVICE */
3683 case DMA_NONE:
07bde79a
NB		 3684 ret = cmd->se_tfo->queue_status(cmd);
3685 if (ret == -EAGAIN)
3686 goto queue_full;
c66ac9db
NB		 3687 break;
3688 default:
3689 break;
3690 }
3691
07bde79a 3692done:
c66ac9db
NB		 3693 transport_lun_remove_cmd(cmd);
3694 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3695 return;
3696
3697queue_full:
6708bb27 3698 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a
NB		 3699 " data_direction: %d\n", cmd, cmd->data_direction);
3700 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 3701}
3702
3703static void transport_free_dev_tasks(struct se_cmd *cmd)
3704{
3705 struct se_task *task, *task_tmp;
3706 unsigned long flags;
3707
a1d8b49a 3708 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3709 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3710 &cmd->t_task_list, t_list) {
c66ac9db
NB		 3711 if (atomic_read(&task->task_active))
3712 continue;
3713
3714 kfree(task->task_sg_bidi);
3715 kfree(task->task_sg);
3716
3717 list_del(&task->t_list);
3718
a1d8b49a 3719 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3720 if (task->se_dev)
e3d6f909 3721 task->se_dev->transport->free_task(task);
c66ac9db 3722 else
6708bb27 3723 pr_err("task[%u] - task->se_dev is NULL\n",
c66ac9db 3724 task->task_no);
a1d8b49a 3725 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3726 }
a1d8b49a 3727 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3728}
3729
6708bb27 3730static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3731{
ec98f782 3732 struct scatterlist *sg;
ec98f782 3733 int count;
c66ac9db 3734
6708bb27
AG		 3735 for_each_sg(sgl, sg, nents, count)
3736 __free_page(sg_page(sg));
c66ac9db 3737
6708bb27
AG		 3738 kfree(sgl);
3739}
c66ac9db 3740
6708bb27
AG		 3741static inline void transport_free_pages(struct se_cmd *cmd)
3742{
3743 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3744 return;
3745
3746 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3747 cmd->t_data_sg = NULL;
3748 cmd->t_data_nents = 0;
c66ac9db 3749
6708bb27 3750 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3751 cmd->t_bidi_data_sg = NULL;
3752 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3753}
3754
3755static inline void transport_release_tasks(struct se_cmd *cmd)
3756{
3757 transport_free_dev_tasks(cmd);
3758}
3759
3760static inline int transport_dec_and_check(struct se_cmd *cmd)
3761{
3762 unsigned long flags;
3763
a1d8b49a
AG		 3764 spin_lock_irqsave(&cmd->t_state_lock, flags);
3765 if (atomic_read(&cmd->t_fe_count)) {
6708bb27 3766 if (!atomic_dec_and_test(&cmd->t_fe_count)) {
a1d8b49a 3767 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3768 flags);
3769 return 1;
3770 }
3771 }
3772
a1d8b49a 3773 if (atomic_read(&cmd->t_se_count)) {
6708bb27 3774 if (!atomic_dec_and_test(&cmd->t_se_count)) {
a1d8b49a 3775 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3776 flags);
3777 return 1;
3778 }
3779 }
a1d8b49a 3780 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3781
3782 return 0;
3783}
3784
3785static void transport_release_fe_cmd(struct se_cmd *cmd)
3786{
3787 unsigned long flags;
3788
3789 if (transport_dec_and_check(cmd))
3790 return;
3791
a1d8b49a 3792 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 3793 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 3794 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3795 goto free_pages;
3796 }
a1d8b49a 3797 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3798 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3799 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3800
3801 transport_release_tasks(cmd);
3802free_pages:
3803 transport_free_pages(cmd);
3804 transport_free_se_cmd(cmd);
35462975 3805 cmd->se_tfo->release_cmd(cmd);
c66ac9db
NB		 3806}
3807
35462975
CH		 3808static int
3809transport_generic_remove(struct se_cmd *cmd, int session_reinstatement)
c66ac9db
NB		 3810{
3811 unsigned long flags;
3812
c66ac9db
NB		 3813 if (transport_dec_and_check(cmd)) {
3814 if (session_reinstatement) {
a1d8b49a 3815 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3816 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3817 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3818 flags);
3819 }
3820 return 1;
3821 }
3822
a1d8b49a 3823 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 3824 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 3825 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3826 goto free_pages;
3827 }
a1d8b49a 3828 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3829 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3830 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3831
3832 transport_release_tasks(cmd);
5951146d 3833
c66ac9db
NB		 3834free_pages:
3835 transport_free_pages(cmd);
35462975 3836 transport_release_cmd(cmd);
c66ac9db
NB		 3837 return 0;
3838}
3839
3840/*
ec98f782
AG		 3841 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3842 * allocating in the core.
c66ac9db
NB		 3843 * @cmd: Associated se_cmd descriptor
3844 * @mem: SGL style memory for TCM WRITE / READ
3845 * @sg_mem_num: Number of SGL elements
3846 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3847 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3848 *
3849 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3850 * of parameters.
3851 */
3852int transport_generic_map_mem_to_cmd(
3853 struct se_cmd *cmd,
5951146d
AG		 3854 struct scatterlist *sgl,
3855 u32 sgl_count,
3856 struct scatterlist *sgl_bidi,
3857 u32 sgl_bidi_count)
c66ac9db 3858{
5951146d 3859 if (!sgl || !sgl_count)
c66ac9db 3860 return 0;
c66ac9db 3861
c66ac9db
NB		 3862 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3863 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3864
ec98f782
AG		 3865 cmd->t_data_sg = sgl;
3866 cmd->t_data_nents = sgl_count;
c66ac9db 3867
ec98f782
AG		 3868 if (sgl_bidi && sgl_bidi_count) {
3869 cmd->t_bidi_data_sg = sgl_bidi;
3870 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3871 }
3872 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3873 }
3874
3875 return 0;
3876}
3877EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3878
c66ac9db
NB		 3879static int transport_new_cmd_obj(struct se_cmd *cmd)
3880{
5951146d 3881 struct se_device *dev = cmd->se_dev;
a1d8b49a
AG		 3882 u32 task_cdbs;
3883 u32 rc;
ec98f782 3884 int set_counts = 1;
c66ac9db 3885
ec98f782
AG		 3886 /*
3887 * Setup any BIDI READ tasks and memory from
3888 * cmd->t_mem_bidi_list so the READ struct se_tasks
3889 * are queued first for the non pSCSI passthrough case.
3890 */
3891 if (cmd->t_bidi_data_sg &&
3892 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3893 rc = transport_allocate_tasks(cmd,
3894 cmd->t_task_lba,
3895 DMA_FROM_DEVICE,
3896 cmd->t_bidi_data_sg,
3897 cmd->t_bidi_data_nents);
6708bb27 3898 if (rc <= 0) {
c66ac9db
NB		 3899 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3900 cmd->scsi_sense_reason =
ec98f782 3901 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db
NB		 3902 return PYX_TRANSPORT_LU_COMM_FAILURE;
3903 }
ec98f782
AG		 3904 atomic_inc(&cmd->t_fe_count);
3905 atomic_inc(&cmd->t_se_count);
3906 set_counts = 0;
3907 }
3908 /*
3909 * Setup the tasks and memory from cmd->t_mem_list
3910 * Note for BIDI transfers this will contain the WRITE payload
3911 */
3912 task_cdbs = transport_allocate_tasks(cmd,
3913 cmd->t_task_lba,
3914 cmd->data_direction,
3915 cmd->t_data_sg,
3916 cmd->t_data_nents);
6708bb27 3917 if (task_cdbs <= 0) {
ec98f782
AG		 3918 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3919 cmd->scsi_sense_reason =
3920 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3921 return PYX_TRANSPORT_LU_COMM_FAILURE;
3922 }
c66ac9db 3923
ec98f782
AG		 3924 if (set_counts) {
3925 atomic_inc(&cmd->t_fe_count);
3926 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3927 }
3928
ec98f782
AG		 3929 cmd->t_task_list_num = task_cdbs;
3930
a1d8b49a
AG		 3931 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3932 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3933 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3934 return 0;
3935}
3936
05d1c7c0
AG		 3937void *transport_kmap_first_data_page(struct se_cmd *cmd)
3938{
ec98f782 3939 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3940
ec98f782 3941 BUG_ON(!sg);
05d1c7c0 3942 /*
ec98f782
AG		 3943 * We need to take into account a possible offset here for fabrics like
3944 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3945 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3946 */
ec98f782 3947 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3948}
3949EXPORT_SYMBOL(transport_kmap_first_data_page);
3950
3951void transport_kunmap_first_data_page(struct se_cmd *cmd)
3952{
ec98f782 3953 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3954}
3955EXPORT_SYMBOL(transport_kunmap_first_data_page);
3956
c66ac9db 3957static int
05d1c7c0 3958transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3959{
ec98f782
AG		 3960 u32 length = cmd->data_length;
3961 unsigned int nents;
3962 struct page *page;
3963 int i = 0;
c66ac9db 3964
ec98f782
AG		 3965 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3966 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3967 if (!cmd->t_data_sg)
3968 return -ENOMEM;
c66ac9db 3969
ec98f782
AG		 3970 cmd->t_data_nents = nents;
3971 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3972
ec98f782
AG		 3973 while (length) {
3974 u32 page_len = min_t(u32, length, PAGE_SIZE);
3975 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3976 if (!page)
3977 goto out;
c66ac9db 3978
ec98f782
AG		 3979 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3980 length -= page_len;
3981 i++;
c66ac9db 3982 }
c66ac9db 3983 return 0;
c66ac9db 3984
ec98f782
AG		 3985out:
3986 while (i >= 0) {
3987 __free_page(sg_page(&cmd->t_data_sg[i]));
3988 i--;
c66ac9db 3989 }
ec98f782
AG		 3990 kfree(cmd->t_data_sg);
3991 cmd->t_data_sg = NULL;
3992 return -ENOMEM;
c66ac9db
NB		 3993}
3994
a1d8b49a
AG		 3995/* Reduce sectors if they are too long for the device */
3996static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3997 struct se_device *dev,
3998 unsigned long long lba,
a1d8b49a 3999 sector_t sectors)
c66ac9db 4000{
a1d8b49a 4001 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 4002
a1d8b49a
AG		 4003 if (dev->transport->get_device_type(dev) == TYPE_DISK)
4004 if ((lba + sectors) > transport_dev_end_lba(dev))
4005 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 4006
a1d8b49a 4007 return sectors;
c66ac9db
NB		 4008}
4009
c66ac9db
NB		 4010
4011/*
4012 * This function can be used by HW target mode drivers to create a linked
4013 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4014 * This is intended to be called during the completion path by TCM Core
4015 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4016 */
4017void transport_do_task_sg_chain(struct se_cmd *cmd)
4018{
ec98f782
AG		 4019 struct scatterlist *sg_first = NULL;
4020 struct scatterlist *sg_prev = NULL;
4021 int sg_prev_nents = 0;
4022 struct scatterlist *sg;
c66ac9db 4023 struct se_task *task;
ec98f782 4024 u32 chained_nents = 0;
c66ac9db
NB		 4025 int i;
4026
ec98f782
AG		 4027 BUG_ON(!cmd->se_tfo->task_sg_chaining);
4028
c66ac9db
NB		 4029 /*
4030 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 4031 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 4032 */
a1d8b49a 4033 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 4034 if (!task->task_sg)
c66ac9db
NB		 4035 continue;
4036
ec98f782 4037 BUG_ON(!task->task_padded_sg);
c66ac9db 4038
ec98f782
AG		 4039 if (!sg_first) {
4040 sg_first = task->task_sg;
6708bb27 4041 chained_nents = task->task_sg_nents;
97868c89 4042 } else {
ec98f782 4043 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 4044 chained_nents += task->task_sg_nents;
97868c89 4045 }
ec98f782
AG		 4046
4047 sg_prev = task->task_sg;
6708bb27 4048 sg_prev_nents = task->task_sg_nents;
c66ac9db
NB		 4049 }
4050 /*
4051 * Setup the starting pointer and total t_tasks_sg_linked_no including
4052 * padding SGs for linking and to mark the end.
4053 */
a1d8b49a 4054 cmd->t_tasks_sg_chained = sg_first;
ec98f782 4055 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 4056
6708bb27 4057 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 4058 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
4059 cmd->t_tasks_sg_chained_no);
c66ac9db 4060
a1d8b49a
AG		 4061 for_each_sg(cmd->t_tasks_sg_chained, sg,
4062 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 4063
6708bb27 4064 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 4065 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 4066 if (sg_is_chain(sg))
6708bb27 4067 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 4068 if (sg_is_last(sg))
6708bb27 4069 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 4070 }
c66ac9db
NB		 4071}
4072EXPORT_SYMBOL(transport_do_task_sg_chain);
4073
a1d8b49a
AG		 4074/*
4075 * Break up cmd into chunks transport can handle
4076 */
ec98f782 4077static int transport_allocate_data_tasks(
c66ac9db
NB		 4078 struct se_cmd *cmd,
4079 unsigned long long lba,
c66ac9db 4080 enum dma_data_direction data_direction,
ec98f782
AG		 4081 struct scatterlist *sgl,
4082 unsigned int sgl_nents)
c66ac9db
NB		 4083{
4084 unsigned char *cdb = NULL;
4085 struct se_task *task;
5951146d 4086 struct se_device *dev = cmd->se_dev;
ec98f782 4087 unsigned long flags;
1d20bb61 4088 int task_count, i, ret;
277c5f27 4089 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 4090 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
4091 struct scatterlist *sg;
4092 struct scatterlist *cmd_sg;
a1d8b49a 4093
ec98f782
AG		 4094 WARN_ON(cmd->data_length % sector_size);
4095 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 4096 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
4097
ec98f782
AG		 4098 cmd_sg = sgl;
4099 for (i = 0; i < task_count; i++) {
4100 unsigned int task_size;
4101 int count;
a1d8b49a 4102
c66ac9db 4103 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 4104 if (!task)
ec98f782 4105 return -ENOMEM;
c66ac9db 4106
c66ac9db 4107 task->task_lba = lba;
ec98f782
AG		 4108 task->task_sectors = min(sectors, dev_max_sectors);
4109 task->task_size = task->task_sectors * sector_size;
c66ac9db 4110
e3d6f909 4111 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4112 BUG_ON(!cdb);
4113
4114 memcpy(cdb, cmd->t_task_cdb,
4115 scsi_command_size(cmd->t_task_cdb));
4116
4117 /* Update new cdb with updated lba/sectors */
3a867205 4118 cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
c66ac9db
NB		 4119
4120 /*
ec98f782
AG		 4121 * Check if the fabric module driver is requesting that all
4122 * struct se_task->task_sg[] be chained together.. If so,
4123 * then allocate an extra padding SG entry for linking and
4124 * marking the end of the chained SGL.
4125 * Possibly over-allocate task sgl size by using cmd sgl size.
4126 * It's so much easier and only a waste when task_count > 1.
4127 * That is extremely rare.
c66ac9db 4128 */
6708bb27 4129 task->task_sg_nents = sgl_nents;
ec98f782 4130 if (cmd->se_tfo->task_sg_chaining) {
6708bb27 4131 task->task_sg_nents++;
ec98f782
AG		 4132 task->task_padded_sg = 1;
4133 }
c66ac9db 4134
1d20bb61 4135 task->task_sg = kmalloc(sizeof(struct scatterlist) *
6708bb27 4136 task->task_sg_nents, GFP_KERNEL);
ec98f782
AG		 4137 if (!task->task_sg) {
4138 cmd->se_dev->transport->free_task(task);
4139 return -ENOMEM;
4140 }
4141
6708bb27 4142 sg_init_table(task->task_sg, task->task_sg_nents);
c66ac9db 4143
ec98f782
AG		 4144 task_size = task->task_size;
4145
4146 /* Build new sgl, only up to task_size */
6708bb27 4147 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 4148 if (cmd_sg->length > task_size)
4149 break;
4150
4151 *sg = *cmd_sg;
4152 task_size -= cmd_sg->length;
4153 cmd_sg = sg_next(cmd_sg);
c66ac9db 4154 }
c66ac9db 4155
ec98f782
AG		 4156 lba += task->task_sectors;
4157 sectors -= task->task_sectors;
c66ac9db 4158
ec98f782
AG		 4159 spin_lock_irqsave(&cmd->t_state_lock, flags);
4160 list_add_tail(&task->t_list, &cmd->t_task_list);
4161 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4162 }
1d20bb61
NB		 4163 /*
4164 * Now perform the memory map of task->task_sg[] into backend
4165 * subsystem memory..
4166 */
4167 list_for_each_entry(task, &cmd->t_task_list, t_list) {
4168 if (atomic_read(&task->task_sent))
4169 continue;
4170 if (!dev->transport->map_data_SG)
4171 continue;
4172
4173 ret = dev->transport->map_data_SG(task);
4174 if (ret < 0)
4175 return 0;
4176 }
c66ac9db 4177
ec98f782 4178 return task_count;
c66ac9db
NB		 4179}
4180
4181static int
ec98f782 4182transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 4183{
5951146d 4184 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4185 unsigned char *cdb;
4186 struct se_task *task;
ec98f782 4187 unsigned long flags;
6708bb27 4188 int ret = 0;
c66ac9db
NB		 4189
4190 task = transport_generic_get_task(cmd, cmd->data_direction);
4191 if (!task)
ec98f782 4192 return -ENOMEM;
c66ac9db 4193
e3d6f909 4194 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4195 BUG_ON(!cdb);
4196 memcpy(cdb, cmd->t_task_cdb,
4197 scsi_command_size(cmd->t_task_cdb));
c66ac9db 4198
ec98f782
AG		 4199 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4200 GFP_KERNEL);
4201 if (!task->task_sg) {
4202 cmd->se_dev->transport->free_task(task);
4203 return -ENOMEM;
4204 }
4205
4206 memcpy(task->task_sg, cmd->t_data_sg,
4207 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 4208 task->task_size = cmd->data_length;
6708bb27 4209 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 4210
ec98f782
AG		 4211 spin_lock_irqsave(&cmd->t_state_lock, flags);
4212 list_add_tail(&task->t_list, &cmd->t_task_list);
4213 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4214
4215 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
1d20bb61
NB		 4216 if (dev->transport->map_control_SG)
4217 ret = dev->transport->map_control_SG(task);
c66ac9db
NB		 4218 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4219 if (dev->transport->cdb_none)
6708bb27 4220 ret = dev->transport->cdb_none(task);
c66ac9db 4221 } else {
6708bb27 4222 pr_err("target: Unknown control cmd type!\n");
c66ac9db 4223 BUG();
ec98f782 4224 }
6708bb27
AG		 4225
4226 /* Success! Return number of tasks allocated */
4227 if (ret == 0)
4228 return 1;
4229 return ret;
ec98f782
AG		 4230}
4231
4232static u32 transport_allocate_tasks(
4233 struct se_cmd *cmd,
4234 unsigned long long lba,
4235 enum dma_data_direction data_direction,
4236 struct scatterlist *sgl,
4237 unsigned int sgl_nents)
4238{
6708bb27 4239 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)
ec98f782
AG		 4240 return transport_allocate_data_tasks(cmd, lba, data_direction,
4241 sgl, sgl_nents);
6708bb27
AG		 4242 else
4243 return transport_allocate_control_task(cmd);
4244
c66ac9db
NB		 4245}
4246
ec98f782 4247
c66ac9db
NB		 4248/* transport_generic_new_cmd(): Called from transport_processing_thread()
4249 *
4250 * Allocate storage transport resources from a set of values predefined
4251 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4252 * Any non zero return here is treated as an "out of resource' op here.
4253 */
4254 /*
4255 * Generate struct se_task(s) and/or their payloads for this CDB.
4256 */
a1d8b49a 4257int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4258{
c66ac9db
NB		 4259 int ret = 0;
4260
4261 /*
4262 * Determine is the TCM fabric module has already allocated physical
4263 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4264 * beforehand.
c66ac9db 4265 */
ec98f782
AG		 4266 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4267 cmd->data_length) {
05d1c7c0 4268 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4269 if (ret < 0)
4270 return ret;
4271 }
1d20bb61
NB		 4272 /*
4273 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4274 * control or data CDB types, and perform the map to backend subsystem
4275 * code from SGL memory allocated here by transport_generic_get_mem(), or
4276 * via pre-existing SGL memory setup explictly by fabric module code with
4277 * transport_generic_map_mem_to_cmd().
4278 */
c66ac9db
NB		 4279 ret = transport_new_cmd_obj(cmd);
4280 if (ret < 0)
4281 return ret;
c66ac9db 4282 /*
a1d8b49a 4283 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4284 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4285 * will be added to the struct se_device execution queue after its WRITE
4286 * data has arrived. (ie: It gets handled by the transport processing
4287 * thread a second time)
4288 */
4289 if (cmd->data_direction == DMA_TO_DEVICE) {
4290 transport_add_tasks_to_state_queue(cmd);
4291 return transport_generic_write_pending(cmd);
4292 }
4293 /*
4294 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4295 * to the execution queue.
4296 */
4297 transport_execute_tasks(cmd);
4298 return 0;
4299}
a1d8b49a 4300EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4301
4302/* transport_generic_process_write():
4303 *
4304 *
4305 */
4306void transport_generic_process_write(struct se_cmd *cmd)
4307{
c66ac9db
NB		 4308 transport_execute_tasks(cmd);
4309}
4310EXPORT_SYMBOL(transport_generic_process_write);
4311
07bde79a
NB		 4312static int transport_write_pending_qf(struct se_cmd *cmd)
4313{
4314 return cmd->se_tfo->write_pending(cmd);
4315}
4316
c66ac9db
NB		 4317/* transport_generic_write_pending():
4318 *
4319 *
4320 */
4321static int transport_generic_write_pending(struct se_cmd *cmd)
4322{
4323 unsigned long flags;
4324 int ret;
4325
a1d8b49a 4326 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4327 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4328 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a
NB		 4329
4330 if (cmd->transport_qf_callback) {
4331 ret = cmd->transport_qf_callback(cmd);
4332 if (ret == -EAGAIN)
4333 goto queue_full;
4334 else if (ret < 0)
4335 return ret;
4336
4337 cmd->transport_qf_callback = NULL;
4338 return 0;
4339 }
05d1c7c0 4340
c66ac9db
NB		 4341 /*
4342 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4343 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4344 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4345 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4346 * because the se_cmd->se_lun pointer is not being cleared.
4347 */
4348 transport_cmd_check_stop(cmd, 1, 0);
4349
4350 /*
4351 * Call the fabric write_pending function here to let the
4352 * frontend know that WRITE buffers are ready.
4353 */
e3d6f909 4354 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4355 if (ret == -EAGAIN)
4356 goto queue_full;
4357 else if (ret < 0)
c66ac9db
NB		 4358 return ret;
4359
4360 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4361
4362queue_full:
6708bb27 4363 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a
NB		 4364 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4365 transport_handle_queue_full(cmd, cmd->se_dev,
4366 transport_write_pending_qf);
4367 return ret;
c66ac9db
NB		 4368}
4369
35462975 4370void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4371{
e3d6f909 4372 BUG_ON(!cmd->se_tfo);
c66ac9db
NB		 4373
4374 transport_free_se_cmd(cmd);
35462975 4375 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4376}
35462975 4377EXPORT_SYMBOL(transport_release_cmd);
c66ac9db
NB		 4378
4379/* transport_generic_free_cmd():
4380 *
4381 * Called from processing frontend to release storage engine resources
4382 */
4383void transport_generic_free_cmd(
4384 struct se_cmd *cmd,
4385 int wait_for_tasks,
c66ac9db
NB		 4386 int session_reinstatement)
4387{
5951146d 4388 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
35462975 4389 transport_release_cmd(cmd);
c66ac9db
NB		 4390 else {
4391 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4392
e3d6f909 4393 if (cmd->se_lun) {
c66ac9db 4394#if 0
6708bb27 4395 pr_debug("cmd: %p ITT: 0x%08x contains"
e3d6f909
AG		 4396 " cmd->se_lun\n", cmd,
4397 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4398#endif
4399 transport_lun_remove_cmd(cmd);
4400 }
4401
4402 if (wait_for_tasks && cmd->transport_wait_for_tasks)
4403 cmd->transport_wait_for_tasks(cmd, 0, 0);
4404
f4366772
NB		 4405 transport_free_dev_tasks(cmd);
4406
35462975 4407 transport_generic_remove(cmd, session_reinstatement);
c66ac9db
NB		 4408 }
4409}
4410EXPORT_SYMBOL(transport_generic_free_cmd);
4411
4412static void transport_nop_wait_for_tasks(
4413 struct se_cmd *cmd,
4414 int remove_cmd,
4415 int session_reinstatement)
4416{
4417 return;
4418}
4419
4420/* transport_lun_wait_for_tasks():
4421 *
4422 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4423 * an struct se_lun to be successfully shutdown.
4424 */
4425static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4426{
4427 unsigned long flags;
4428 int ret;
4429 /*
4430 * If the frontend has already requested this struct se_cmd to
4431 * be stopped, we can safely ignore this struct se_cmd.
4432 */
a1d8b49a
AG		 4433 spin_lock_irqsave(&cmd->t_state_lock, flags);
4434 if (atomic_read(&cmd->t_transport_stop)) {
4435 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4436 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4437 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4438 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4439 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4440 return -EPERM;
c66ac9db 4441 }
a1d8b49a
AG		 4442 atomic_set(&cmd->transport_lun_fe_stop, 1);
4443 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4444
5951146d 4445 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4446
4447 ret = transport_stop_tasks_for_cmd(cmd);
4448
6708bb27
AG		 4449 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4450 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4451 if (!ret) {
6708bb27 4452 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4453 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4454 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4455 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4456 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4457 }
5951146d 4458 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4459
4460 return 0;
4461}
4462
c66ac9db
NB		 4463static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4464{
4465 struct se_cmd *cmd = NULL;
4466 unsigned long lun_flags, cmd_flags;
4467 /*
4468 * Do exception processing and return CHECK_CONDITION status to the
4469 * Initiator Port.
4470 */
4471 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4472 while (!list_empty(&lun->lun_cmd_list)) {
4473 cmd = list_first_entry(&lun->lun_cmd_list,
4474 struct se_cmd, se_lun_node);
4475 list_del(&cmd->se_lun_node);
4476
a1d8b49a 4477 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4478 /*
4479 * This will notify iscsi_target_transport.c:
4480 * transport_cmd_check_stop() that a LUN shutdown is in
4481 * progress for the iscsi_cmd_t.
4482 */
a1d8b49a 4483 spin_lock(&cmd->t_state_lock);
6708bb27 4484 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4485 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4486 cmd->se_lun->unpacked_lun,
4487 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4488 atomic_set(&cmd->transport_lun_stop, 1);
4489 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4490
4491 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4492
6708bb27
AG		 4493 if (!cmd->se_lun) {
4494 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4495 cmd->se_tfo->get_task_tag(cmd),
4496 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4497 BUG();
4498 }
4499 /*
4500 * If the Storage engine still owns the iscsi_cmd_t, determine
4501 * and/or stop its context.
4502 */
6708bb27 4503 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4504 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4505 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4506
e3d6f909 4507 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4508 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4509 continue;
4510 }
4511
6708bb27 4512 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4513 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4514 cmd->se_lun->unpacked_lun,
4515 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4516
a1d8b49a 4517 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4518 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4519 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4520 goto check_cond;
4521 }
a1d8b49a 4522 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4523 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4524 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4525
4526 transport_free_dev_tasks(cmd);
4527 /*
4528 * The Storage engine stopped this struct se_cmd before it was
4529 * send to the fabric frontend for delivery back to the
4530 * Initiator Node. Return this SCSI CDB back with an
4531 * CHECK_CONDITION status.
4532 */
4533check_cond:
4534 transport_send_check_condition_and_sense(cmd,
4535 TCM_NON_EXISTENT_LUN, 0);
4536 /*
4537 * If the fabric frontend is waiting for this iscsi_cmd_t to
4538 * be released, notify the waiting thread now that LU has
4539 * finished accessing it.
4540 */
a1d8b49a
AG		 4541 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4542 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4543 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4544 " struct se_cmd: %p ITT: 0x%08x\n",
4545 lun->unpacked_lun,
e3d6f909 4546 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4547
a1d8b49a 4548 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4549 cmd_flags);
4550 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4551 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4552 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4553 continue;
4554 }
6708bb27 4555 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4556 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4557
a1d8b49a 4558 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4559 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4560 }
4561 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4562}
4563
4564static int transport_clear_lun_thread(void *p)
4565{
4566 struct se_lun *lun = (struct se_lun *)p;
4567
4568 __transport_clear_lun_from_sessions(lun);
4569 complete(&lun->lun_shutdown_comp);
4570
4571 return 0;
4572}
4573
4574int transport_clear_lun_from_sessions(struct se_lun *lun)
4575{
4576 struct task_struct *kt;
4577
5951146d 4578 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4579 "tcm_cl_%u", lun->unpacked_lun);
4580 if (IS_ERR(kt)) {
6708bb27 4581 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4582 return PTR_ERR(kt);
c66ac9db
NB		 4583 }
4584 wait_for_completion(&lun->lun_shutdown_comp);
4585
4586 return 0;
4587}
4588
4589/* transport_generic_wait_for_tasks():
4590 *
4591 * Called from frontend or passthrough context to wait for storage engine
4592 * to pause and/or release frontend generated struct se_cmd.
4593 */
4594static void transport_generic_wait_for_tasks(
4595 struct se_cmd *cmd,
4596 int remove_cmd,
4597 int session_reinstatement)
4598{
4599 unsigned long flags;
4600
4601 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
4602 return;
4603
a1d8b49a 4604 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4605 /*
4606 * If we are already stopped due to an external event (ie: LUN shutdown)
4607 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4608 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4609 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4610 * has completed its operation on the struct se_cmd.
4611 */
a1d8b49a 4612 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4613
6708bb27 4614 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4615 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4616 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4617 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4618 /*
4619 * There is a special case for WRITES where a FE exception +
4620 * LUN shutdown means ConfigFS context is still sleeping on
4621 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4622 * We go ahead and up transport_lun_stop_comp just to be sure
4623 * here.
4624 */
a1d8b49a
AG		 4625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4626 complete(&cmd->transport_lun_stop_comp);
4627 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4628 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4629
4630 transport_all_task_dev_remove_state(cmd);
4631 /*
4632 * At this point, the frontend who was the originator of this
4633 * struct se_cmd, now owns the structure and can be released through
4634 * normal means below.
4635 */
6708bb27 4636 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4637 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4638 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4639 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4640
a1d8b49a 4641 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4642 }
a1d8b49a
AG		 4643 if (!atomic_read(&cmd->t_transport_active) ||
4644 atomic_read(&cmd->t_transport_aborted))
c66ac9db
NB		 4645 goto remove;
4646
a1d8b49a 4647 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4648
6708bb27 4649 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
c66ac9db 4650 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 4651 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4652 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 4653 cmd->deferred_t_state);
4654
a1d8b49a 4655 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4656
5951146d 4657 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4658
a1d8b49a 4659 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4660
a1d8b49a
AG		 4661 spin_lock_irqsave(&cmd->t_state_lock, flags);
4662 atomic_set(&cmd->t_transport_active, 0);
4663 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4664
6708bb27 4665 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4666 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4667 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4668remove:
a1d8b49a 4669 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4670 if (!remove_cmd)
4671 return;
4672
35462975 4673 transport_generic_free_cmd(cmd, 0, session_reinstatement);
c66ac9db
NB		 4674}
4675
4676static int transport_get_sense_codes(
4677 struct se_cmd *cmd,
4678 u8 *asc,
4679 u8 *ascq)
4680{
4681 *asc = cmd->scsi_asc;
4682 *ascq = cmd->scsi_ascq;
4683
4684 return 0;
4685}
4686
4687static int transport_set_sense_codes(
4688 struct se_cmd *cmd,
4689 u8 asc,
4690 u8 ascq)
4691{
4692 cmd->scsi_asc = asc;
4693 cmd->scsi_ascq = ascq;
4694
4695 return 0;
4696}
4697
4698int transport_send_check_condition_and_sense(
4699 struct se_cmd *cmd,
4700 u8 reason,
4701 int from_transport)
4702{
4703 unsigned char *buffer = cmd->sense_buffer;
4704 unsigned long flags;
4705 int offset;
4706 u8 asc = 0, ascq = 0;
4707
a1d8b49a 4708 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4709 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4710 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4711 return 0;
4712 }
4713 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4715
4716 if (!reason && from_transport)
4717 goto after_reason;
4718
4719 if (!from_transport)
4720 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4721 /*
4722 * Data Segment and SenseLength of the fabric response PDU.
4723 *
4724 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4725 * from include/scsi/scsi_cmnd.h
4726 */
e3d6f909 4727 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4728 TRANSPORT_SENSE_BUFFER);
4729 /*
4730 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4731 * SENSE KEY values from include/scsi/scsi.h
4732 */
4733 switch (reason) {
4734 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4735 /* CURRENT ERROR */
4736 buffer[offset] = 0x70;
4737 /* ILLEGAL REQUEST */
4738 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4739 /* LOGICAL UNIT NOT SUPPORTED */
4740 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4741 break;
c66ac9db
NB		 4742 case TCM_UNSUPPORTED_SCSI_OPCODE:
4743 case TCM_SECTOR_COUNT_TOO_MANY:
4744 /* CURRENT ERROR */
4745 buffer[offset] = 0x70;
4746 /* ILLEGAL REQUEST */
4747 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4748 /* INVALID COMMAND OPERATION CODE */
4749 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4750 break;
4751 case TCM_UNKNOWN_MODE_PAGE:
4752 /* CURRENT ERROR */
4753 buffer[offset] = 0x70;
4754 /* ILLEGAL REQUEST */
4755 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4756 /* INVALID FIELD IN CDB */
4757 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4758 break;
4759 case TCM_CHECK_CONDITION_ABORT_CMD:
4760 /* CURRENT ERROR */
4761 buffer[offset] = 0x70;
4762 /* ABORTED COMMAND */
4763 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4764 /* BUS DEVICE RESET FUNCTION OCCURRED */
4765 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4766 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4767 break;
4768 case TCM_INCORRECT_AMOUNT_OF_DATA:
4769 /* CURRENT ERROR */
4770 buffer[offset] = 0x70;
4771 /* ABORTED COMMAND */
4772 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4773 /* WRITE ERROR */
4774 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4775 /* NOT ENOUGH UNSOLICITED DATA */
4776 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4777 break;
4778 case TCM_INVALID_CDB_FIELD:
4779 /* CURRENT ERROR */
4780 buffer[offset] = 0x70;
4781 /* ABORTED COMMAND */
4782 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4783 /* INVALID FIELD IN CDB */
4784 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4785 break;
4786 case TCM_INVALID_PARAMETER_LIST:
4787 /* CURRENT ERROR */
4788 buffer[offset] = 0x70;
4789 /* ABORTED COMMAND */
4790 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4791 /* INVALID FIELD IN PARAMETER LIST */
4792 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4793 break;
4794 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4795 /* CURRENT ERROR */
4796 buffer[offset] = 0x70;
4797 /* ABORTED COMMAND */
4798 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4799 /* WRITE ERROR */
4800 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4801 /* UNEXPECTED_UNSOLICITED_DATA */
4802 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4803 break;
4804 case TCM_SERVICE_CRC_ERROR:
4805 /* CURRENT ERROR */
4806 buffer[offset] = 0x70;
4807 /* ABORTED COMMAND */
4808 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4809 /* PROTOCOL SERVICE CRC ERROR */
4810 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4811 /* N/A */
4812 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4813 break;
4814 case TCM_SNACK_REJECTED:
4815 /* CURRENT ERROR */
4816 buffer[offset] = 0x70;
4817 /* ABORTED COMMAND */
4818 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4819 /* READ ERROR */
4820 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4821 /* FAILED RETRANSMISSION REQUEST */
4822 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4823 break;
4824 case TCM_WRITE_PROTECTED:
4825 /* CURRENT ERROR */
4826 buffer[offset] = 0x70;
4827 /* DATA PROTECT */
4828 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4829 /* WRITE PROTECTED */
4830 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4831 break;
4832 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4833 /* CURRENT ERROR */
4834 buffer[offset] = 0x70;
4835 /* UNIT ATTENTION */
4836 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4837 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4838 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4839 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4840 break;
4841 case TCM_CHECK_CONDITION_NOT_READY:
4842 /* CURRENT ERROR */
4843 buffer[offset] = 0x70;
4844 /* Not Ready */
4845 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4846 transport_get_sense_codes(cmd, &asc, &ascq);
4847 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4848 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4849 break;
4850 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4851 default:
4852 /* CURRENT ERROR */
4853 buffer[offset] = 0x70;
4854 /* ILLEGAL REQUEST */
4855 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4856 /* LOGICAL UNIT COMMUNICATION FAILURE */
4857 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4858 break;
4859 }
4860 /*
4861 * This code uses linux/include/scsi/scsi.h SAM status codes!
4862 */
4863 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4864 /*
4865 * Automatically padded, this value is encoded in the fabric's
4866 * data_length response PDU containing the SCSI defined sense data.
4867 */
4868 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4869
4870after_reason:
07bde79a 4871 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4872}
4873EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4874
4875int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4876{
4877 int ret = 0;
4878
a1d8b49a 4879 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4880 if (!send_status ||
c66ac9db
NB		 4881 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4882 return 1;
4883#if 0
6708bb27 4884 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4885 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4886 cmd->t_task_cdb[0],
e3d6f909 4887 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4888#endif
4889 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4890 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4891 ret = 1;
4892 }
4893 return ret;
4894}
4895EXPORT_SYMBOL(transport_check_aborted_status);
4896
4897void transport_send_task_abort(struct se_cmd *cmd)
4898{
4899 /*
4900 * If there are still expected incoming fabric WRITEs, we wait
4901 * until until they have completed before sending a TASK_ABORTED
4902 * response. This response with TASK_ABORTED status will be
4903 * queued back to fabric module by transport_check_aborted_status().
4904 */
4905 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4906 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4907 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4908 smp_mb__after_atomic_inc();
4909 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4910 transport_new_cmd_failure(cmd);
4911 return;
4912 }
4913 }
4914 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4915#if 0
6708bb27 4916 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4917 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4918 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4919#endif
e3d6f909 4920 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4921}
4922
4923/* transport_generic_do_tmr():
4924 *
4925 *
4926 */
4927int transport_generic_do_tmr(struct se_cmd *cmd)
4928{
5951146d 4929 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4930 struct se_tmr_req *tmr = cmd->se_tmr_req;
4931 int ret;
4932
4933 switch (tmr->function) {
5c6cd613 4934 case TMR_ABORT_TASK:
c66ac9db
NB		 4935 tmr->response = TMR_FUNCTION_REJECTED;
4936 break;
5c6cd613
NB		 4937 case TMR_ABORT_TASK_SET:
4938 case TMR_CLEAR_ACA:
4939 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4940 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4941 break;
5c6cd613 4942 case TMR_LUN_RESET:
c66ac9db
NB		 4943 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4944 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4945 TMR_FUNCTION_REJECTED;
4946 break;
5c6cd613 4947 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4948 tmr->response = TMR_FUNCTION_REJECTED;
4949 break;
5c6cd613 4950 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4951 tmr->response = TMR_FUNCTION_REJECTED;
4952 break;
c66ac9db 4953 default:
6708bb27 4954 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4955 tmr->function);
4956 tmr->response = TMR_FUNCTION_REJECTED;
4957 break;
4958 }
4959
4960 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4961 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db
NB		 4962
4963 transport_cmd_check_stop(cmd, 2, 0);
4964 return 0;
4965}
4966
4967/*
4968 * Called with spin_lock_irq(&dev->execute_task_lock); held
4969 *
4970 */
4971static struct se_task *
4972transport_get_task_from_state_list(struct se_device *dev)
4973{
4974 struct se_task *task;
4975
4976 if (list_empty(&dev->state_task_list))
4977 return NULL;
4978
4979 list_for_each_entry(task, &dev->state_task_list, t_state_list)
4980 break;
4981
4982 list_del(&task->t_state_list);
4983 atomic_set(&task->task_state_active, 0);
4984
4985 return task;
4986}
4987
4988static void transport_processing_shutdown(struct se_device *dev)
4989{
4990 struct se_cmd *cmd;
c66ac9db 4991 struct se_task *task;
c66ac9db
NB		 4992 unsigned long flags;
4993 /*
4994 * Empty the struct se_device's struct se_task state list.
4995 */
4996 spin_lock_irqsave(&dev->execute_task_lock, flags);
4997 while ((task = transport_get_task_from_state_list(dev))) {
e3d6f909 4998 if (!task->task_se_cmd) {
6708bb27 4999 pr_err("task->task_se_cmd is NULL!\n");
c66ac9db
NB		 5000 continue;
5001 }
e3d6f909 5002 cmd = task->task_se_cmd;
c66ac9db 5003
c66ac9db
NB		 5004 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5005
a1d8b49a 5006 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 5007
6708bb27
AG		 5008 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
5009 " i_state: %d, t_state/def_t_state:"
c66ac9db 5010 " %d/%d cdb: 0x%02x\n", cmd, task,
6708bb27
AG		 5011 cmd->se_tfo->get_task_tag(cmd),
5012 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db 5013 cmd->t_state, cmd->deferred_t_state,
a1d8b49a 5014 cmd->t_task_cdb[0]);
6708bb27 5015 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
c66ac9db
NB		 5016 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5017 " t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909 5018 cmd->se_tfo->get_task_tag(cmd),
6708bb27 5019 cmd->t_task_list_num,
a1d8b49a
AG		 5020 atomic_read(&cmd->t_task_cdbs_left),
5021 atomic_read(&cmd->t_task_cdbs_sent),
5022 atomic_read(&cmd->t_transport_active),
5023 atomic_read(&cmd->t_transport_stop),
5024 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 5025
5026 if (atomic_read(&task->task_active)) {
5027 atomic_set(&task->task_stop, 1);
5028 spin_unlock_irqrestore(
a1d8b49a 5029 &cmd->t_state_lock, flags);
c66ac9db 5030
6708bb27 5031 pr_debug("Waiting for task: %p to shutdown for dev:"
c66ac9db
NB		 5032 " %p\n", task, dev);
5033 wait_for_completion(&task->task_stop_comp);
6708bb27 5034 pr_debug("Completed task: %p shutdown for dev: %p\n",
c66ac9db
NB		 5035 task, dev);
5036
a1d8b49a
AG		 5037 spin_lock_irqsave(&cmd->t_state_lock, flags);
5038 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 5039
5040 atomic_set(&task->task_active, 0);
5041 atomic_set(&task->task_stop, 0);
52208ae3
NB		 5042 } else {
5043 if (atomic_read(&task->task_execute_queue) != 0)
5044 transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 5045 }
5046 __transport_stop_task_timer(task, &flags);
5047
6708bb27 5048 if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
c66ac9db 5049 spin_unlock_irqrestore(
a1d8b49a 5050 &cmd->t_state_lock, flags);
c66ac9db 5051
6708bb27 5052 pr_debug("Skipping task: %p, dev: %p for"
c66ac9db 5053 " t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a 5054 atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db
NB		 5055
5056 spin_lock_irqsave(&dev->execute_task_lock, flags);
5057 continue;
5058 }
5059
a1d8b49a 5060 if (atomic_read(&cmd->t_transport_active)) {
6708bb27 5061 pr_debug("got t_transport_active = 1 for task: %p, dev:"
c66ac9db
NB		 5062 " %p\n", task, dev);
5063
a1d8b49a 5064 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5065 spin_unlock_irqrestore(
a1d8b49a 5066 &cmd->t_state_lock, flags);
c66ac9db
NB		 5067 transport_send_check_condition_and_sense(
5068 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5069 0);
5070 transport_remove_cmd_from_queue(cmd,
5951146d 5071 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5072
5073 transport_lun_remove_cmd(cmd);
5074 transport_cmd_check_stop(cmd, 1, 0);
5075 } else {
5076 spin_unlock_irqrestore(
a1d8b49a 5077 &cmd->t_state_lock, flags);
c66ac9db
NB		 5078
5079 transport_remove_cmd_from_queue(cmd,
5951146d 5080 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5081
5082 transport_lun_remove_cmd(cmd);
5083
5084 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5085 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5086 }
5087
5088 spin_lock_irqsave(&dev->execute_task_lock, flags);
5089 continue;
5090 }
6708bb27 5091 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
c66ac9db
NB		 5092 task, dev);
5093
a1d8b49a 5094 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5095 spin_unlock_irqrestore(
a1d8b49a 5096 &cmd->t_state_lock, flags);
c66ac9db
NB		 5097 transport_send_check_condition_and_sense(cmd,
5098 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5099 transport_remove_cmd_from_queue(cmd,
5951146d 5100 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5101
5102 transport_lun_remove_cmd(cmd);
5103 transport_cmd_check_stop(cmd, 1, 0);
5104 } else {
5105 spin_unlock_irqrestore(
a1d8b49a 5106 &cmd->t_state_lock, flags);
c66ac9db
NB		 5107
5108 transport_remove_cmd_from_queue(cmd,
5951146d 5109 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5110 transport_lun_remove_cmd(cmd);
5111
5112 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5113 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5114 }
5115
5116 spin_lock_irqsave(&dev->execute_task_lock, flags);
5117 }
5118 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5119 /*
5120 * Empty the struct se_device's struct se_cmd list.
5121 */
5951146d 5122 while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
c66ac9db 5123
6708bb27 5124 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5951146d 5125 cmd, cmd->t_state);
c66ac9db 5126
a1d8b49a 5127 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db
NB		 5128 transport_send_check_condition_and_sense(cmd,
5129 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5130
5131 transport_lun_remove_cmd(cmd);
5132 transport_cmd_check_stop(cmd, 1, 0);
5133 } else {
5134 transport_lun_remove_cmd(cmd);
5135 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5136 transport_generic_remove(cmd, 0);
c66ac9db 5137 }
c66ac9db 5138 }
c66ac9db
NB		 5139}
5140
5141/* transport_processing_thread():
5142 *
5143 *
5144 */
5145static int transport_processing_thread(void *param)
5146{
5951146d 5147 int ret;
c66ac9db
NB		 5148 struct se_cmd *cmd;
5149 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 5150
5151 set_user_nice(current, -20);
5152
5153 while (!kthread_should_stop()) {
e3d6f909
AG		 5154 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5155 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 5156 kthread_should_stop());
5157 if (ret < 0)
5158 goto out;
5159
5160 spin_lock_irq(&dev->dev_status_lock);
5161 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5162 spin_unlock_irq(&dev->dev_status_lock);
5163 transport_processing_shutdown(dev);
5164 continue;
5165 }
5166 spin_unlock_irq(&dev->dev_status_lock);
5167
5168get_cmd:
5169 __transport_execute_tasks(dev);
5170
5951146d
AG		 5171 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5172 if (!cmd)
c66ac9db
NB		 5173 continue;
5174
5951146d 5175 switch (cmd->t_state) {
c66ac9db 5176 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 5177 if (!cmd->se_tfo->new_cmd_map) {
5178 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 5179 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5180 BUG();
5181 }
e3d6f909 5182 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 5183 if (ret < 0) {
5184 cmd->transport_error_status = ret;
5185 transport_generic_request_failure(cmd, NULL,
5186 0, (cmd->data_direction !=
5187 DMA_TO_DEVICE));
5188 break;
5189 }
5190 /* Fall through */
5191 case TRANSPORT_NEW_CMD:
5192 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 5193 if (ret == -EAGAIN)
5194 break;
5195 else if (ret < 0) {
c66ac9db
NB		 5196 cmd->transport_error_status = ret;
5197 transport_generic_request_failure(cmd, NULL,
5198 0, (cmd->data_direction !=
5199 DMA_TO_DEVICE));
5200 }
5201 break;
5202 case TRANSPORT_PROCESS_WRITE:
5203 transport_generic_process_write(cmd);
5204 break;
5205 case TRANSPORT_COMPLETE_OK:
5206 transport_stop_all_task_timers(cmd);
5207 transport_generic_complete_ok(cmd);
5208 break;
5209 case TRANSPORT_REMOVE:
35462975 5210 transport_generic_remove(cmd, 0);
c66ac9db 5211 break;
f4366772 5212 case TRANSPORT_FREE_CMD_INTR:
35462975 5213 transport_generic_free_cmd(cmd, 0, 0);
f4366772 5214 break;
c66ac9db
NB		 5215 case TRANSPORT_PROCESS_TMR:
5216 transport_generic_do_tmr(cmd);
5217 break;
5218 case TRANSPORT_COMPLETE_FAILURE:
5219 transport_generic_request_failure(cmd, NULL, 1, 1);
5220 break;
5221 case TRANSPORT_COMPLETE_TIMEOUT:
5222 transport_stop_all_task_timers(cmd);
5223 transport_generic_request_timeout(cmd);
5224 break;
07bde79a
NB		 5225 case TRANSPORT_COMPLETE_QF_WP:
5226 transport_generic_write_pending(cmd);
5227 break;
c66ac9db 5228 default:
6708bb27 5229 pr_err("Unknown t_state: %d deferred_t_state:"
c66ac9db 5230 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 5231 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 5232 cmd->se_tfo->get_task_tag(cmd),
5233 cmd->se_tfo->get_cmd_state(cmd),
5234 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 5235 BUG();
5236 }
5237
5238 goto get_cmd;
5239 }
5240
5241out:
5242 transport_release_all_cmds(dev);
5243 dev->process_thread = NULL;
5244 return 0;
5245}
Linux 6.x block layer and io_uring tree(s)