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Merge tag 'renesas-dt-fixes2-for-v3.14' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-bionic-kernel.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 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
c66ac9db
NB		 37#include <asm/unaligned.h>
38#include <net/sock.h>
39#include <net/tcp.h>
40#include <scsi/scsi.h>
41#include <scsi/scsi_cmnd.h>
e66ecd50 42#include <scsi/scsi_tcq.h>
c66ac9db
NB		 43
44#include <target/target_core_base.h>
c4795fb2
CH		 45#include <target/target_core_backend.h>
46#include <target/target_core_fabric.h>
c66ac9db
NB		 47#include <target/target_core_configfs.h>
48
e26d99ae 49#include "target_core_internal.h"
c66ac9db 50#include "target_core_alua.h"
c66ac9db 51#include "target_core_pr.h"
c66ac9db
NB		 52#include "target_core_ua.h"
53
e5c0d6ad
RD		 54#define CREATE_TRACE_POINTS
55#include <trace/events/target.h>
56
35e0e757 57static struct workqueue_struct *target_completion_wq;
c66ac9db 58static struct kmem_cache *se_sess_cache;
c66ac9db 59struct kmem_cache *se_ua_cache;
c66ac9db
NB		 60struct kmem_cache *t10_pr_reg_cache;
61struct kmem_cache *t10_alua_lu_gp_cache;
62struct kmem_cache *t10_alua_lu_gp_mem_cache;
63struct kmem_cache *t10_alua_tg_pt_gp_cache;
64struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
65
c66ac9db 66static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 67static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 68 struct se_device *dev);
d5ddad41 69static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 70static void target_complete_ok_work(struct work_struct *work);
c66ac9db 71
e3d6f909 72int init_se_kmem_caches(void)
c66ac9db 73{
c66ac9db
NB		 74 se_sess_cache = kmem_cache_create("se_sess_cache",
75 sizeof(struct se_session), __alignof__(struct se_session),
76 0, NULL);
6708bb27
AG		 77 if (!se_sess_cache) {
78 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 79 " failed\n");
c8e31f26 80 goto out;
c66ac9db
NB		 81 }
82 se_ua_cache = kmem_cache_create("se_ua_cache",
83 sizeof(struct se_ua), __alignof__(struct se_ua),
84 0, NULL);
6708bb27
AG		 85 if (!se_ua_cache) {
86 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 87 goto out_free_sess_cache;
c66ac9db 88 }
c66ac9db
NB		 89 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
90 sizeof(struct t10_pr_registration),
91 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 92 if (!t10_pr_reg_cache) {
93 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 94 " failed\n");
35e0e757 95 goto out_free_ua_cache;
c66ac9db
NB		 96 }
97 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
98 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
99 0, NULL);
6708bb27
AG		 100 if (!t10_alua_lu_gp_cache) {
101 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 102 " failed\n");
35e0e757 103 goto out_free_pr_reg_cache;
c66ac9db
NB		 104 }
105 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
106 sizeof(struct t10_alua_lu_gp_member),
107 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 108 if (!t10_alua_lu_gp_mem_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 110 "cache failed\n");
35e0e757 111 goto out_free_lu_gp_cache;
c66ac9db
NB		 112 }
113 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
114 sizeof(struct t10_alua_tg_pt_gp),
115 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 116 if (!t10_alua_tg_pt_gp_cache) {
117 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 118 "cache failed\n");
35e0e757 119 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 120 }
121 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
122 "t10_alua_tg_pt_gp_mem_cache",
123 sizeof(struct t10_alua_tg_pt_gp_member),
124 __alignof__(struct t10_alua_tg_pt_gp_member),
125 0, NULL);
6708bb27
AG		 126 if (!t10_alua_tg_pt_gp_mem_cache) {
127 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 128 "mem_t failed\n");
35e0e757 129 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 130 }
131
35e0e757
CH		 132 target_completion_wq = alloc_workqueue("target_completion",
133 WQ_MEM_RECLAIM, 0);
134 if (!target_completion_wq)
135 goto out_free_tg_pt_gp_mem_cache;
136
c66ac9db 137 return 0;
35e0e757
CH		 138
139out_free_tg_pt_gp_mem_cache:
140 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
141out_free_tg_pt_gp_cache:
142 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
143out_free_lu_gp_mem_cache:
144 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
145out_free_lu_gp_cache:
146 kmem_cache_destroy(t10_alua_lu_gp_cache);
147out_free_pr_reg_cache:
148 kmem_cache_destroy(t10_pr_reg_cache);
149out_free_ua_cache:
150 kmem_cache_destroy(se_ua_cache);
151out_free_sess_cache:
152 kmem_cache_destroy(se_sess_cache);
c66ac9db 153out:
e3d6f909 154 return -ENOMEM;
c66ac9db
NB		 155}
156
e3d6f909 157void release_se_kmem_caches(void)
c66ac9db 158{
35e0e757 159 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 160 kmem_cache_destroy(se_sess_cache);
161 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 162 kmem_cache_destroy(t10_pr_reg_cache);
163 kmem_cache_destroy(t10_alua_lu_gp_cache);
164 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
165 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
166 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 167}
168
e3d6f909
AG		 169/* This code ensures unique mib indexes are handed out. */
170static DEFINE_SPINLOCK(scsi_mib_index_lock);
171static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 172
173/*
174 * Allocate a new row index for the entry type specified
175 */
176u32 scsi_get_new_index(scsi_index_t type)
177{
178 u32 new_index;
179
e3d6f909 180 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 181
e3d6f909
AG		 182 spin_lock(&scsi_mib_index_lock);
183 new_index = ++scsi_mib_index[type];
184 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 185
186 return new_index;
187}
188
dbc5623e 189void transport_subsystem_check_init(void)
c66ac9db
NB		 190{
191 int ret;
283669d2 192 static int sub_api_initialized;
c66ac9db 193
dbc5623e
NB		 194 if (sub_api_initialized)
195 return;
196
c66ac9db
NB		 197 ret = request_module("target_core_iblock");
198 if (ret != 0)
6708bb27 199 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 200
201 ret = request_module("target_core_file");
202 if (ret != 0)
6708bb27 203 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 204
205 ret = request_module("target_core_pscsi");
206 if (ret != 0)
6708bb27 207 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 208
e3d6f909 209 sub_api_initialized = 1;
c66ac9db
NB		 210}
211
212struct se_session *transport_init_session(void)
213{
214 struct se_session *se_sess;
215
216 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 217 if (!se_sess) {
218 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 219 " se_sess_cache\n");
220 return ERR_PTR(-ENOMEM);
221 }
222 INIT_LIST_HEAD(&se_sess->sess_list);
223 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 224 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 225 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 226 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 227 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 228
229 return se_sess;
230}
231EXPORT_SYMBOL(transport_init_session);
232
c0add7fd
NB		 233int transport_alloc_session_tags(struct se_session *se_sess,
234 unsigned int tag_num, unsigned int tag_size)
235{
236 int rc;
237
8c7f6e9b
NB		 238 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
239 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 240 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 241 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
242 if (!se_sess->sess_cmd_map) {
243 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
244 return -ENOMEM;
245 }
c0add7fd
NB		 246 }
247
248 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
249 if (rc < 0) {
250 pr_err("Unable to init se_sess->sess_tag_pool,"
251 " tag_num: %u\n", tag_num);
8c7f6e9b
NB		 252 if (is_vmalloc_addr(se_sess->sess_cmd_map))
253 vfree(se_sess->sess_cmd_map);
254 else
255 kfree(se_sess->sess_cmd_map);
c0add7fd
NB		 256 se_sess->sess_cmd_map = NULL;
257 return -ENOMEM;
258 }
259
260 return 0;
261}
262EXPORT_SYMBOL(transport_alloc_session_tags);
263
264struct se_session *transport_init_session_tags(unsigned int tag_num,
265 unsigned int tag_size)
266{
267 struct se_session *se_sess;
268 int rc;
269
270 se_sess = transport_init_session();
271 if (IS_ERR(se_sess))
272 return se_sess;
273
274 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
275 if (rc < 0) {
276 transport_free_session(se_sess);
277 return ERR_PTR(-ENOMEM);
278 }
279
280 return se_sess;
281}
282EXPORT_SYMBOL(transport_init_session_tags);
283
c66ac9db 284/*
140854cb 285 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 286 */
287void __transport_register_session(
288 struct se_portal_group *se_tpg,
289 struct se_node_acl *se_nacl,
290 struct se_session *se_sess,
291 void *fabric_sess_ptr)
292{
293 unsigned char buf[PR_REG_ISID_LEN];
294
295 se_sess->se_tpg = se_tpg;
296 se_sess->fabric_sess_ptr = fabric_sess_ptr;
297 /*
298 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
299 *
300 * Only set for struct se_session's that will actually be moving I/O.
301 * eg: *NOT* discovery sessions.
302 */
303 if (se_nacl) {
304 /*
305 * If the fabric module supports an ISID based TransportID,
306 * save this value in binary from the fabric I_T Nexus now.
307 */
e3d6f909 308 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 309 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 310 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 311 &buf[0], PR_REG_ISID_LEN);
312 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
313 }
afb999ff
NB		 314 kref_get(&se_nacl->acl_kref);
315
c66ac9db
NB		 316 spin_lock_irq(&se_nacl->nacl_sess_lock);
317 /*
318 * The se_nacl->nacl_sess pointer will be set to the
319 * last active I_T Nexus for each struct se_node_acl.
320 */
321 se_nacl->nacl_sess = se_sess;
322
323 list_add_tail(&se_sess->sess_acl_list,
324 &se_nacl->acl_sess_list);
325 spin_unlock_irq(&se_nacl->nacl_sess_lock);
326 }
327 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
328
6708bb27 329 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 330 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 331}
332EXPORT_SYMBOL(__transport_register_session);
333
334void transport_register_session(
335 struct se_portal_group *se_tpg,
336 struct se_node_acl *se_nacl,
337 struct se_session *se_sess,
338 void *fabric_sess_ptr)
339{
140854cb
NB		 340 unsigned long flags;
341
342 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 343 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 344 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 345}
346EXPORT_SYMBOL(transport_register_session);
347
ecf0dd66 348static void target_release_session(struct kref *kref)
41ac82b6
NB		 349{
350 struct se_session *se_sess = container_of(kref,
351 struct se_session, sess_kref);
352 struct se_portal_group *se_tpg = se_sess->se_tpg;
353
354 se_tpg->se_tpg_tfo->close_session(se_sess);
355}
356
357void target_get_session(struct se_session *se_sess)
358{
359 kref_get(&se_sess->sess_kref);
360}
361EXPORT_SYMBOL(target_get_session);
362
33933a0e 363void target_put_session(struct se_session *se_sess)
41ac82b6 364{
4149268e
JE		 365 struct se_portal_group *tpg = se_sess->se_tpg;
366
367 if (tpg->se_tpg_tfo->put_session != NULL) {
368 tpg->se_tpg_tfo->put_session(se_sess);
369 return;
370 }
33933a0e 371 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 372}
373EXPORT_SYMBOL(target_put_session);
374
afb999ff
NB		 375static void target_complete_nacl(struct kref *kref)
376{
377 struct se_node_acl *nacl = container_of(kref,
378 struct se_node_acl, acl_kref);
379
380 complete(&nacl->acl_free_comp);
381}
382
383void target_put_nacl(struct se_node_acl *nacl)
384{
385 kref_put(&nacl->acl_kref, target_complete_nacl);
386}
387
c66ac9db
NB		 388void transport_deregister_session_configfs(struct se_session *se_sess)
389{
390 struct se_node_acl *se_nacl;
23388864 391 unsigned long flags;
c66ac9db
NB		 392 /*
393 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
394 */
395 se_nacl = se_sess->se_node_acl;
6708bb27 396 if (se_nacl) {
23388864 397 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 398 if (se_nacl->acl_stop == 0)
399 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 400 /*
401 * If the session list is empty, then clear the pointer.
402 * Otherwise, set the struct se_session pointer from the tail
403 * element of the per struct se_node_acl active session list.
404 */
405 if (list_empty(&se_nacl->acl_sess_list))
406 se_nacl->nacl_sess = NULL;
407 else {
408 se_nacl->nacl_sess = container_of(
409 se_nacl->acl_sess_list.prev,
410 struct se_session, sess_acl_list);
411 }
23388864 412 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 413 }
414}
415EXPORT_SYMBOL(transport_deregister_session_configfs);
416
417void transport_free_session(struct se_session *se_sess)
418{
c0add7fd
NB		 419 if (se_sess->sess_cmd_map) {
420 percpu_ida_destroy(&se_sess->sess_tag_pool);
8c7f6e9b
NB		 421 if (is_vmalloc_addr(se_sess->sess_cmd_map))
422 vfree(se_sess->sess_cmd_map);
423 else
424 kfree(se_sess->sess_cmd_map);
c0add7fd 425 }
c66ac9db
NB		 426 kmem_cache_free(se_sess_cache, se_sess);
427}
428EXPORT_SYMBOL(transport_free_session);
429
430void transport_deregister_session(struct se_session *se_sess)
431{
432 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 433 struct target_core_fabric_ops *se_tfo;
c66ac9db 434 struct se_node_acl *se_nacl;
e63a8e19 435 unsigned long flags;
01468346 436 bool comp_nacl = true;
c66ac9db 437
6708bb27 438 if (!se_tpg) {
c66ac9db
NB		 439 transport_free_session(se_sess);
440 return;
441 }
01468346 442 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 443
e63a8e19 444 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 445 list_del(&se_sess->sess_list);
446 se_sess->se_tpg = NULL;
447 se_sess->fabric_sess_ptr = NULL;
e63a8e19 448 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 449
450 /*
451 * Determine if we need to do extra work for this initiator node's
452 * struct se_node_acl if it had been previously dynamically generated.
453 */
454 se_nacl = se_sess->se_node_acl;
01468346
NB		 455
456 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
457 if (se_nacl && se_nacl->dynamic_node_acl) {
458 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
459 list_del(&se_nacl->acl_list);
460 se_tpg->num_node_acls--;
461 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
462 core_tpg_wait_for_nacl_pr_ref(se_nacl);
463 core_free_device_list_for_node(se_nacl, se_tpg);
464 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
465
466 comp_nacl = false;
467 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 468 }
c66ac9db 469 }
01468346 470 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 471
6708bb27 472 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 473 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 474 /*
125d0119 475 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 476 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
477 * removal context.
01468346
NB		 478 */
479 if (se_nacl && comp_nacl == true)
afb999ff 480 target_put_nacl(se_nacl);
01468346 481
afb999ff 482 transport_free_session(se_sess);
c66ac9db
NB		 483}
484EXPORT_SYMBOL(transport_deregister_session);
485
486/*
a1d8b49a 487 * Called with cmd->t_state_lock held.
c66ac9db 488 */
cf572a96 489static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 490{
42bf829e 491 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 492 unsigned long flags;
493
42bf829e
CH		 494 if (!dev)
495 return;
c66ac9db 496
cf572a96
CH		 497 if (cmd->transport_state & CMD_T_BUSY)
498 return;
c66ac9db 499
cf572a96
CH		 500 spin_lock_irqsave(&dev->execute_task_lock, flags);
501 if (cmd->state_active) {
502 list_del(&cmd->state_list);
cf572a96 503 cmd->state_active = false;
c66ac9db 504 }
cf572a96 505 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 506}
507
862e6389
NB		 508static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
509 bool write_pending)
c66ac9db
NB		 510{
511 unsigned long flags;
512
a1d8b49a 513 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 514 if (write_pending)
515 cmd->t_state = TRANSPORT_WRITE_PENDING;
516
f7113a47
CH		 517 if (remove_from_lists) {
518 target_remove_from_state_list(cmd);
519
520 /*
521 * Clear struct se_cmd->se_lun before the handoff to FE.
522 */
523 cmd->se_lun = NULL;
524 }
525
c66ac9db
NB		 526 /*
527 * Determine if frontend context caller is requesting the stopping of
e3d6f909 528 * this command for frontend exceptions.
c66ac9db 529 */
7d680f3b
CH		 530 if (cmd->transport_state & CMD_T_STOP) {
531 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
532 __func__, __LINE__,
e3d6f909 533 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 534
a1d8b49a 535 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 536
a1d8b49a 537 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 538 return 1;
539 }
f7113a47
CH		 540
541 cmd->transport_state &= ~CMD_T_ACTIVE;
542 if (remove_from_lists) {
543 /*
544 * Some fabric modules like tcm_loop can release
545 * their internally allocated I/O reference now and
546 * struct se_cmd now.
547 *
548 * Fabric modules are expected to return '1' here if the
549 * se_cmd being passed is released at this point,
550 * or zero if not being released.
551 */
552 if (cmd->se_tfo->check_stop_free != NULL) {
553 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
554 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 555 }
f7113a47 556 }
c66ac9db 557
a1d8b49a 558 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 559 return 0;
560}
561
562static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
563{
862e6389 564 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 565}
566
567static void transport_lun_remove_cmd(struct se_cmd *cmd)
568{
e3d6f909 569 struct se_lun *lun = cmd->se_lun;
c66ac9db 570
5277797d 571 if (!lun || !cmd->lun_ref_active)
c66ac9db
NB		 572 return;
573
5277797d 574 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 575}
576
577void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
578{
c66ac9db
NB		 579 if (transport_cmd_check_stop_to_fabric(cmd))
580 return;
af877292 581 if (remove)
e6a2573f 582 transport_put_cmd(cmd);
c66ac9db
NB		 583}
584
35e0e757
CH		 585static void target_complete_failure_work(struct work_struct *work)
586{
587 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
588
de103c93
CH		 589 transport_generic_request_failure(cmd,
590 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 591}
592
6138ed2a 593/*
d5829eac
PB		 594 * Used when asking transport to copy Sense Data from the underlying
595 * Linux/SCSI struct scsi_cmnd
6138ed2a 596 */
d5829eac 597static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 598{
6138ed2a 599 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 600
601 WARN_ON(!cmd->se_lun);
602
603 if (!dev)
d5829eac 604 return NULL;
6138ed2a 605
d5829eac
PB		 606 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
607 return NULL;
6138ed2a 608
9c58b7dd 609 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 610
d5829eac 611 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 612 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 613 return cmd->sense_buffer;
6138ed2a
PB		 614}
615
5787cacd 616void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 617{
42bf829e 618 struct se_device *dev = cmd->se_dev;
5787cacd 619 int success = scsi_status == GOOD;
c66ac9db 620 unsigned long flags;
c66ac9db 621
5787cacd
CH		 622 cmd->scsi_status = scsi_status;
623
624
a1d8b49a 625 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 626 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 627
c66ac9db 628 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 629 dev->transport->transport_complete(cmd,
630 cmd->t_data_sg,
631 transport_get_sense_buffer(cmd));
632 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 633 success = 1;
c66ac9db
NB		 634 }
635
636 /*
5787cacd 637 * See if we are waiting to complete for an exception condition.
c66ac9db 638 */
cf572a96 639 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 640 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 641 complete(&cmd->task_stop_comp);
c66ac9db
NB		 642 return;
643 }
2235007c
CH		 644
645 if (!success)
7d680f3b 646 cmd->transport_state |= CMD_T_FAILED;
2235007c 647
3d28934a 648 /*
125d0119 649 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 650 * and transport_wait_for_tasks() will be waiting for completion..
651 */
652 if (cmd->transport_state & CMD_T_ABORTED &&
653 cmd->transport_state & CMD_T_STOP) {
654 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
655 complete(&cmd->t_transport_stop_comp);
656 return;
657 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 658 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 659 } else {
35e0e757 660 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 661 }
35e0e757 662
35e0e757 663 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 664 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 665 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 666
35e0e757 667 queue_work(target_completion_wq, &cmd->work);
c66ac9db 668}
6bb35e00
CH		 669EXPORT_SYMBOL(target_complete_cmd);
670
cf572a96 671static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 672{
cf572a96
CH		 673 struct se_device *dev = cmd->se_dev;
674 unsigned long flags;
c66ac9db 675
cf572a96
CH		 676 spin_lock_irqsave(&dev->execute_task_lock, flags);
677 if (!cmd->state_active) {
678 list_add_tail(&cmd->state_list, &dev->state_list);
679 cmd->state_active = true;
c66ac9db 680 }
cf572a96 681 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 682}
683
07bde79a 684/*
f147abb4 685 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 686 */
7a6f0a1e
CH		 687static void transport_write_pending_qf(struct se_cmd *cmd);
688static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 689
0fd97ccf 690void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 691{
692 struct se_device *dev = container_of(work, struct se_device,
693 qf_work_queue);
bcac364a 694 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 695 struct se_cmd *cmd, *cmd_tmp;
696
697 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 698 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
699 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 700
bcac364a 701 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 702 list_del(&cmd->se_qf_node);
703 atomic_dec(&dev->dev_qf_count);
704 smp_mb__after_atomic_dec();
07bde79a 705
6708bb27 706 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 707 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 708 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 709 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
710 : "UNKNOWN");
f7a5cc0b 711
7a6f0a1e
CH		 712 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
713 transport_write_pending_qf(cmd);
714 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
715 transport_complete_qf(cmd);
07bde79a 716 }
07bde79a
NB		 717}
718
c66ac9db
NB		 719unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
720{
721 switch (cmd->data_direction) {
722 case DMA_NONE:
723 return "NONE";
724 case DMA_FROM_DEVICE:
725 return "READ";
726 case DMA_TO_DEVICE:
727 return "WRITE";
728 case DMA_BIDIRECTIONAL:
729 return "BIDI";
730 default:
731 break;
732 }
733
734 return "UNKNOWN";
735}
736
737void transport_dump_dev_state(
738 struct se_device *dev,
739 char *b,
740 int *bl)
741{
742 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 743 if (dev->export_count)
c66ac9db 744 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 745 else
c66ac9db 746 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 747
5f41a31d 748 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 749 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 750 dev->dev_attrib.block_size,
751 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 752 *bl += sprintf(b + *bl, " ");
753}
754
c66ac9db
NB		 755void transport_dump_vpd_proto_id(
756 struct t10_vpd *vpd,
757 unsigned char *p_buf,
758 int p_buf_len)
759{
760 unsigned char buf[VPD_TMP_BUF_SIZE];
761 int len;
762
763 memset(buf, 0, VPD_TMP_BUF_SIZE);
764 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
765
766 switch (vpd->protocol_identifier) {
767 case 0x00:
768 sprintf(buf+len, "Fibre Channel\n");
769 break;
770 case 0x10:
771 sprintf(buf+len, "Parallel SCSI\n");
772 break;
773 case 0x20:
774 sprintf(buf+len, "SSA\n");
775 break;
776 case 0x30:
777 sprintf(buf+len, "IEEE 1394\n");
778 break;
779 case 0x40:
780 sprintf(buf+len, "SCSI Remote Direct Memory Access"
781 " Protocol\n");
782 break;
783 case 0x50:
784 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
785 break;
786 case 0x60:
787 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
788 break;
789 case 0x70:
790 sprintf(buf+len, "Automation/Drive Interface Transport"
791 " Protocol\n");
792 break;
793 case 0x80:
794 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
795 break;
796 default:
797 sprintf(buf+len, "Unknown 0x%02x\n",
798 vpd->protocol_identifier);
799 break;
800 }
801
802 if (p_buf)
803 strncpy(p_buf, buf, p_buf_len);
804 else
6708bb27 805 pr_debug("%s", buf);
c66ac9db
NB		 806}
807
808void
809transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
810{
811 /*
812 * Check if the Protocol Identifier Valid (PIV) bit is set..
813 *
814 * from spc3r23.pdf section 7.5.1
815 */
816 if (page_83[1] & 0x80) {
817 vpd->protocol_identifier = (page_83[0] & 0xf0);
818 vpd->protocol_identifier_set = 1;
819 transport_dump_vpd_proto_id(vpd, NULL, 0);
820 }
821}
822EXPORT_SYMBOL(transport_set_vpd_proto_id);
823
824int transport_dump_vpd_assoc(
825 struct t10_vpd *vpd,
826 unsigned char *p_buf,
827 int p_buf_len)
828{
829 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 830 int ret = 0;
831 int len;
c66ac9db
NB		 832
833 memset(buf, 0, VPD_TMP_BUF_SIZE);
834 len = sprintf(buf, "T10 VPD Identifier Association: ");
835
836 switch (vpd->association) {
837 case 0x00:
838 sprintf(buf+len, "addressed logical unit\n");
839 break;
840 case 0x10:
841 sprintf(buf+len, "target port\n");
842 break;
843 case 0x20:
844 sprintf(buf+len, "SCSI target device\n");
845 break;
846 default:
847 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 848 ret = -EINVAL;
c66ac9db
NB		 849 break;
850 }
851
852 if (p_buf)
853 strncpy(p_buf, buf, p_buf_len);
854 else
6708bb27 855 pr_debug("%s", buf);
c66ac9db
NB		 856
857 return ret;
858}
859
860int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
861{
862 /*
863 * The VPD identification association..
864 *
865 * from spc3r23.pdf Section 7.6.3.1 Table 297
866 */
867 vpd->association = (page_83[1] & 0x30);
868 return transport_dump_vpd_assoc(vpd, NULL, 0);
869}
870EXPORT_SYMBOL(transport_set_vpd_assoc);
871
872int transport_dump_vpd_ident_type(
873 struct t10_vpd *vpd,
874 unsigned char *p_buf,
875 int p_buf_len)
876{
877 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 878 int ret = 0;
879 int len;
c66ac9db
NB		 880
881 memset(buf, 0, VPD_TMP_BUF_SIZE);
882 len = sprintf(buf, "T10 VPD Identifier Type: ");
883
884 switch (vpd->device_identifier_type) {
885 case 0x00:
886 sprintf(buf+len, "Vendor specific\n");
887 break;
888 case 0x01:
889 sprintf(buf+len, "T10 Vendor ID based\n");
890 break;
891 case 0x02:
892 sprintf(buf+len, "EUI-64 based\n");
893 break;
894 case 0x03:
895 sprintf(buf+len, "NAA\n");
896 break;
897 case 0x04:
898 sprintf(buf+len, "Relative target port identifier\n");
899 break;
900 case 0x08:
901 sprintf(buf+len, "SCSI name string\n");
902 break;
903 default:
904 sprintf(buf+len, "Unsupported: 0x%02x\n",
905 vpd->device_identifier_type);
e3d6f909 906 ret = -EINVAL;
c66ac9db
NB		 907 break;
908 }
909
e3d6f909
AG		 910 if (p_buf) {
911 if (p_buf_len < strlen(buf)+1)
912 return -EINVAL;
c66ac9db 913 strncpy(p_buf, buf, p_buf_len);
e3d6f909 914 } else {
6708bb27 915 pr_debug("%s", buf);
e3d6f909 916 }
c66ac9db
NB		 917
918 return ret;
919}
920
921int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
922{
923 /*
924 * The VPD identifier type..
925 *
926 * from spc3r23.pdf Section 7.6.3.1 Table 298
927 */
928 vpd->device_identifier_type = (page_83[1] & 0x0f);
929 return transport_dump_vpd_ident_type(vpd, NULL, 0);
930}
931EXPORT_SYMBOL(transport_set_vpd_ident_type);
932
933int transport_dump_vpd_ident(
934 struct t10_vpd *vpd,
935 unsigned char *p_buf,
936 int p_buf_len)
937{
938 unsigned char buf[VPD_TMP_BUF_SIZE];
939 int ret = 0;
940
941 memset(buf, 0, VPD_TMP_BUF_SIZE);
942
943 switch (vpd->device_identifier_code_set) {
944 case 0x01: /* Binary */
703d641d
DC		 945 snprintf(buf, sizeof(buf),
946 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 947 &vpd->device_identifier[0]);
948 break;
949 case 0x02: /* ASCII */
703d641d
DC		 950 snprintf(buf, sizeof(buf),
951 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 952 &vpd->device_identifier[0]);
953 break;
954 case 0x03: /* UTF-8 */
703d641d
DC		 955 snprintf(buf, sizeof(buf),
956 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 957 &vpd->device_identifier[0]);
958 break;
959 default:
960 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
961 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 962 ret = -EINVAL;
c66ac9db
NB		 963 break;
964 }
965
966 if (p_buf)
967 strncpy(p_buf, buf, p_buf_len);
968 else
6708bb27 969 pr_debug("%s", buf);
c66ac9db
NB		 970
971 return ret;
972}
973
974int
975transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
976{
977 static const char hex_str[] = "0123456789abcdef";
35d1efe8 978 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 979
980 /*
981 * The VPD Code Set (encoding)
982 *
983 * from spc3r23.pdf Section 7.6.3.1 Table 296
984 */
985 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
986 switch (vpd->device_identifier_code_set) {
987 case 0x01: /* Binary */
988 vpd->device_identifier[j++] =
989 hex_str[vpd->device_identifier_type];
990 while (i < (4 + page_83[3])) {
991 vpd->device_identifier[j++] =
992 hex_str[(page_83[i] & 0xf0) >> 4];
993 vpd->device_identifier[j++] =
994 hex_str[page_83[i] & 0x0f];
995 i++;
996 }
997 break;
998 case 0x02: /* ASCII */
999 case 0x03: /* UTF-8 */
1000 while (i < (4 + page_83[3]))
1001 vpd->device_identifier[j++] = page_83[i++];
1002 break;
1003 default:
1004 break;
1005 }
1006
1007 return transport_dump_vpd_ident(vpd, NULL, 0);
1008}
1009EXPORT_SYMBOL(transport_set_vpd_ident);
1010
de103c93
CH		 1011sense_reason_t
1012target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1013{
1014 struct se_device *dev = cmd->se_dev;
1015
1016 if (cmd->unknown_data_length) {
1017 cmd->data_length = size;
1018 } else if (size != cmd->data_length) {
1019 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1020 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1021 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1022 cmd->data_length, size, cmd->t_task_cdb[0]);
1023
9b3b8041
CH		 1024 if (cmd->data_direction == DMA_TO_DEVICE) {
1025 pr_err("Rejecting underflow/overflow"
1026 " WRITE data\n");
de103c93 1027 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1028 }
1029 /*
1030 * Reject READ_* or WRITE_* with overflow/underflow for
1031 * type SCF_SCSI_DATA_CDB.
1032 */
0fd97ccf 1033 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1034 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1035 " CDB on non 512-byte sector setup subsystem"
1036 " plugin: %s\n", dev->transport->name);
1037 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1038 return TCM_INVALID_CDB_FIELD;
9b3b8041 1039 }
4c054ba6
NB		 1040 /*
1041 * For the overflow case keep the existing fabric provided
1042 * ->data_length. Otherwise for the underflow case, reset
1043 * ->data_length to the smaller SCSI expected data transfer
1044 * length.
1045 */
9b3b8041
CH		 1046 if (size > cmd->data_length) {
1047 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1048 cmd->residual_count = (size - cmd->data_length);
1049 } else {
1050 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1051 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1052 cmd->data_length = size;
9b3b8041 1053 }
9b3b8041
CH		 1054 }
1055
1056 return 0;
1057
9b3b8041
CH		 1058}
1059
c66ac9db
NB		 1060/*
1061 * Used by fabric modules containing a local struct se_cmd within their
1062 * fabric dependent per I/O descriptor.
1063 */
1064void transport_init_se_cmd(
1065 struct se_cmd *cmd,
1066 struct target_core_fabric_ops *tfo,
1067 struct se_session *se_sess,
1068 u32 data_length,
1069 int data_direction,
1070 int task_attr,
1071 unsigned char *sense_buffer)
1072{
5951146d 1073 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1074 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1075 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1076 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1077 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1078 init_completion(&cmd->cmd_wait_comp);
cf572a96 1079 init_completion(&cmd->task_stop_comp);
a1d8b49a 1080 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1081 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1082
1083 cmd->se_tfo = tfo;
1084 cmd->se_sess = se_sess;
1085 cmd->data_length = data_length;
1086 cmd->data_direction = data_direction;
1087 cmd->sam_task_attr = task_attr;
1088 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1089
1090 cmd->state_active = false;
c66ac9db
NB		 1091}
1092EXPORT_SYMBOL(transport_init_se_cmd);
1093
de103c93
CH		 1094static sense_reason_t
1095transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1096{
019c4ca6
CH		 1097 struct se_device *dev = cmd->se_dev;
1098
c66ac9db
NB		 1099 /*
1100 * Check if SAM Task Attribute emulation is enabled for this
1101 * struct se_device storage object
1102 */
019c4ca6 1103 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1104 return 0;
1105
e66ecd50 1106 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1107 pr_debug("SAM Task Attribute ACA"
c66ac9db 1108 " emulation is not supported\n");
de103c93 1109 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1110 }
1111 /*
1112 * Used to determine when ORDERED commands should go from
1113 * Dormant to Active status.
1114 */
019c4ca6 1115 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1116 smp_mb__after_atomic_inc();
6708bb27 1117 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1118 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1119 dev->transport->name);
c66ac9db
NB		 1120 return 0;
1121}
1122
de103c93
CH		 1123sense_reason_t
1124target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1125{
0fd97ccf 1126 struct se_device *dev = cmd->se_dev;
de103c93 1127 sense_reason_t ret;
c66ac9db 1128
c66ac9db
NB		 1129 /*
1130 * Ensure that the received CDB is less than the max (252 + 8) bytes
1131 * for VARIABLE_LENGTH_CMD
1132 */
1133 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1134 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1135 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1136 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1137 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1138 }
1139 /*
1140 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1141 * allocate the additional extended CDB buffer now.. Otherwise
1142 * setup the pointer from __t_task_cdb to t_task_cdb.
1143 */
a1d8b49a
AG		 1144 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1145 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1146 GFP_KERNEL);
6708bb27
AG		 1147 if (!cmd->t_task_cdb) {
1148 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1149 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1150 scsi_command_size(cdb),
a1d8b49a 1151 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1152 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1153 }
1154 } else
a1d8b49a 1155 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1156 /*
a1d8b49a 1157 * Copy the original CDB into cmd->
c66ac9db 1158 */
a1d8b49a 1159 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1160
e5c0d6ad
RD		 1161 trace_target_sequencer_start(cmd);
1162
cb4f4d3c
CH		 1163 /*
1164 * Check for an existing UNIT ATTENTION condition
1165 */
de103c93
CH		 1166 ret = target_scsi3_ua_check(cmd);
1167 if (ret)
1168 return ret;
cb4f4d3c 1169
c87fbd56 1170 ret = target_alua_state_check(cmd);
de103c93
CH		 1171 if (ret)
1172 return ret;
cb4f4d3c 1173
d977f437 1174 ret = target_check_reservation(cmd);
f85eda8d
NB		 1175 if (ret) {
1176 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1177 return ret;
f85eda8d 1178 }
cb4f4d3c 1179
0fd97ccf 1180 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1181 if (ret)
1182 return ret;
1183
1184 ret = transport_check_alloc_task_attr(cmd);
1185 if (ret)
c66ac9db 1186 return ret;
cb4f4d3c 1187
cb4f4d3c 1188 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1189
c66ac9db
NB		 1190 spin_lock(&cmd->se_lun->lun_sep_lock);
1191 if (cmd->se_lun->lun_sep)
1192 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1193 spin_unlock(&cmd->se_lun->lun_sep_lock);
1194 return 0;
1195}
a12f41f8 1196EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1197
695434e1
NB		 1198/*
1199 * Used by fabric module frontends to queue tasks directly.
1200 * Many only be used from process context only
1201 */
1202int transport_handle_cdb_direct(
1203 struct se_cmd *cmd)
1204{
de103c93 1205 sense_reason_t ret;
dd8ae59d 1206
695434e1
NB		 1207 if (!cmd->se_lun) {
1208 dump_stack();
6708bb27 1209 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1210 return -EINVAL;
1211 }
1212 if (in_interrupt()) {
1213 dump_stack();
6708bb27 1214 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1215 " from interrupt context\n");
1216 return -EINVAL;
1217 }
dd8ae59d 1218 /*
af877292
CH		 1219 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1220 * outstanding descriptors are handled correctly during shutdown via
1221 * transport_wait_for_tasks()
dd8ae59d
NB		 1222 *
1223 * Also, we don't take cmd->t_state_lock here as we only expect
1224 * this to be called for initial descriptor submission.
1225 */
1226 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1227 cmd->transport_state |= CMD_T_ACTIVE;
1228
dd8ae59d
NB		 1229 /*
1230 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1231 * so follow TRANSPORT_NEW_CMD processing thread context usage
1232 * and call transport_generic_request_failure() if necessary..
1233 */
1234 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1235 if (ret)
1236 transport_generic_request_failure(cmd, ret);
dd8ae59d 1237 return 0;
695434e1
NB		 1238}
1239EXPORT_SYMBOL(transport_handle_cdb_direct);
1240
c5ff8d6b 1241sense_reason_t
de103c93
CH		 1242transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1243 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1244{
1245 if (!sgl || !sgl_count)
1246 return 0;
1247
1248 /*
1249 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1250 * scatterlists already have been set to follow what the fabric
1251 * passes for the original expected data transfer length.
1252 */
1253 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1254 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1255 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1256 return TCM_INVALID_CDB_FIELD;
1257 }
1258
1259 cmd->t_data_sg = sgl;
1260 cmd->t_data_nents = sgl_count;
1261
1262 if (sgl_bidi && sgl_bidi_count) {
1263 cmd->t_bidi_data_sg = sgl_bidi;
1264 cmd->t_bidi_data_nents = sgl_bidi_count;
1265 }
1266 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1267 return 0;
1268}
1269
a026757f
NB		 1270/*
1271 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1272 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1273 *
1274 * @se_cmd: command descriptor to submit
1275 * @se_sess: associated se_sess for endpoint
1276 * @cdb: pointer to SCSI CDB
1277 * @sense: pointer to SCSI sense buffer
1278 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1279 * @data_length: fabric expected data transfer length
1280 * @task_addr: SAM task attribute
1281 * @data_dir: DMA data direction
1282 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1283 * @sgl: struct scatterlist memory for unidirectional mapping
1284 * @sgl_count: scatterlist count for unidirectional mapping
1285 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1286 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1287 *
d6dfc868
RD		 1288 * Returns non zero to signal active I/O shutdown failure. All other
1289 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1290 * but still return zero here.
1291 *
a6360785
NB		 1292 * This may only be called from process context, and also currently
1293 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1294 */
1295int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1296 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1297 u32 data_length, int task_attr, int data_dir, int flags,
1298 struct scatterlist *sgl, u32 sgl_count,
1299 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1300{
1301 struct se_portal_group *se_tpg;
de103c93
CH		 1302 sense_reason_t rc;
1303 int ret;
a6360785
NB		 1304
1305 se_tpg = se_sess->se_tpg;
1306 BUG_ON(!se_tpg);
1307 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1308 BUG_ON(in_interrupt());
1309 /*
1310 * Initialize se_cmd for target operation. From this point
1311 * exceptions are handled by sending exception status via
1312 * target_core_fabric_ops->queue_status() callback
1313 */
1314 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1315 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1316 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1317 se_cmd->unknown_data_length = 1;
a6360785
NB		 1318 /*
1319 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1320 * se_sess->sess_cmd_list. A second kref_get here is necessary
1321 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1322 * kref_put() to happen during fabric packet acknowledgement.
1323 */
de103c93
CH		 1324 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1325 if (ret)
1326 return ret;
a6360785
NB		 1327 /*
1328 * Signal bidirectional data payloads to target-core
1329 */
1330 if (flags & TARGET_SCF_BIDI_OP)
1331 se_cmd->se_cmd_flags |= SCF_BIDI;
1332 /*
1333 * Locate se_lun pointer and attach it to struct se_cmd
1334 */
de103c93
CH		 1335 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1336 if (rc) {
1337 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1338 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1339 return 0;
735703ca 1340 }
d6e0175c 1341
a12f41f8 1342 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1343 if (rc != 0) {
de103c93 1344 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1345 return 0;
735703ca 1346 }
a026757f
NB		 1347 /*
1348 * When a non zero sgl_count has been passed perform SGL passthrough
1349 * mapping for pre-allocated fabric memory instead of having target
1350 * core perform an internal SGL allocation..
1351 */
1352 if (sgl_count != 0) {
1353 BUG_ON(!sgl);
1354
944981c7
NB		 1355 /*
1356 * A work-around for tcm_loop as some userspace code via
1357 * scsi-generic do not memset their associated read buffers,
1358 * so go ahead and do that here for type non-data CDBs. Also
1359 * note that this is currently guaranteed to be a single SGL
1360 * for this case by target core in target_setup_cmd_from_cdb()
1361 * -> transport_generic_cmd_sequencer().
1362 */
1363 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1364 se_cmd->data_direction == DMA_FROM_DEVICE) {
1365 unsigned char *buf = NULL;
1366
1367 if (sgl)
1368 buf = kmap(sg_page(sgl)) + sgl->offset;
1369
1370 if (buf) {
1371 memset(buf, 0, sgl->length);
1372 kunmap(sg_page(sgl));
1373 }
1374 }
1375
a026757f
NB		 1376 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1377 sgl_bidi, sgl_bidi_count);
1378 if (rc != 0) {
de103c93 1379 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1380 return 0;
1381 }
1382 }
11e319ed
AG		 1383 /*
1384 * Check if we need to delay processing because of ALUA
1385 * Active/NonOptimized primary access state..
1386 */
1387 core_alua_check_nonop_delay(se_cmd);
1388
a6360785 1389 transport_handle_cdb_direct(se_cmd);
d6dfc868 1390 return 0;
a6360785 1391}
a026757f
NB		 1392EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1393
1394/*
1395 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1396 *
1397 * @se_cmd: command descriptor to submit
1398 * @se_sess: associated se_sess for endpoint
1399 * @cdb: pointer to SCSI CDB
1400 * @sense: pointer to SCSI sense buffer
1401 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1402 * @data_length: fabric expected data transfer length
1403 * @task_addr: SAM task attribute
1404 * @data_dir: DMA data direction
1405 * @flags: flags for command submission from target_sc_flags_tables
1406 *
1407 * Returns non zero to signal active I/O shutdown failure. All other
1408 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1409 * but still return zero here.
1410 *
1411 * This may only be called from process context, and also currently
1412 * assumes internal allocation of fabric payload buffer by target-core.
1413 *
1414 * It also assumes interal target core SGL memory allocation.
1415 */
1416int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1417 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1418 u32 data_length, int task_attr, int data_dir, int flags)
1419{
1420 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1421 unpacked_lun, data_length, task_attr, data_dir,
1422 flags, NULL, 0, NULL, 0);
1423}
a6360785
NB		 1424EXPORT_SYMBOL(target_submit_cmd);
1425
9f0d05c2
NB		 1426static void target_complete_tmr_failure(struct work_struct *work)
1427{
1428 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1429
1430 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1431 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1432
1433 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1434}
1435
ea98d7f9
AG		 1436/**
1437 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1438 * for TMR CDBs
1439 *
1440 * @se_cmd: command descriptor to submit
1441 * @se_sess: associated se_sess for endpoint
1442 * @sense: pointer to SCSI sense buffer
1443 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1444 * @fabric_context: fabric context for TMR req
1445 * @tm_type: Type of TM request
c0974f89
NB		 1446 * @gfp: gfp type for caller
1447 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1448 * @flags: submit cmd flags
ea98d7f9
AG		 1449 *
1450 * Callable from all contexts.
1451 **/
1452
c7042cae 1453int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1454 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1455 void *fabric_tmr_ptr, unsigned char tm_type,
1456 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1457{
1458 struct se_portal_group *se_tpg;
1459 int ret;
1460
1461 se_tpg = se_sess->se_tpg;
1462 BUG_ON(!se_tpg);
1463
1464 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1465 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1466 /*
1467 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1468 * allocation failure.
1469 */
c0974f89 1470 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1471 if (ret < 0)
1472 return -ENOMEM;
ea98d7f9 1473
c0974f89
NB		 1474 if (tm_type == TMR_ABORT_TASK)
1475 se_cmd->se_tmr_req->ref_task_tag = tag;
1476
ea98d7f9 1477 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1478 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1479 if (ret) {
1480 core_tmr_release_req(se_cmd->se_tmr_req);
1481 return ret;
1482 }
ea98d7f9 1483
ea98d7f9
AG		 1484 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1485 if (ret) {
9f0d05c2
NB		 1486 /*
1487 * For callback during failure handling, push this work off
1488 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1489 */
1490 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1491 schedule_work(&se_cmd->work);
c7042cae 1492 return 0;
ea98d7f9
AG		 1493 }
1494 transport_generic_handle_tmr(se_cmd);
c7042cae 1495 return 0;
ea98d7f9
AG		 1496}
1497EXPORT_SYMBOL(target_submit_tmr);
1498
cdbb70bb 1499/*
cf572a96 1500 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1501 * has completed.
1502 */
cf572a96 1503bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1504{
cdbb70bb
CH		 1505 bool was_active = false;
1506
cf572a96
CH		 1507 if (cmd->transport_state & CMD_T_BUSY) {
1508 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1509 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1510
cf572a96
CH		 1511 pr_debug("cmd %p waiting to complete\n", cmd);
1512 wait_for_completion(&cmd->task_stop_comp);
1513 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1514
1515 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1516 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1517 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1518 was_active = true;
1519 }
1520
cdbb70bb
CH		 1521 return was_active;
1522}
1523
c66ac9db
NB		 1524/*
1525 * Handle SAM-esque emulation for generic transport request failures.
1526 */
de103c93
CH		 1527void transport_generic_request_failure(struct se_cmd *cmd,
1528 sense_reason_t sense_reason)
c66ac9db 1529{
07bde79a
NB		 1530 int ret = 0;
1531
6708bb27 1532 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1533 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1534 cmd->t_task_cdb[0]);
de103c93 1535 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1536 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1537 cmd->t_state, sense_reason);
d43d6aea 1538 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1539 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1540 (cmd->transport_state & CMD_T_STOP) != 0,
1541 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1542
c66ac9db
NB		 1543 /*
1544 * For SAM Task Attribute emulation for failed struct se_cmd
1545 */
019c4ca6 1546 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1547 /*
1548 * Handle special case for COMPARE_AND_WRITE failure, where the
1549 * callback is expected to drop the per device ->caw_mutex.
1550 */
1551 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1552 cmd->transport_complete_callback)
1553 cmd->transport_complete_callback(cmd);
c66ac9db 1554
de103c93 1555 switch (sense_reason) {
03e98c9e
NB		 1556 case TCM_NON_EXISTENT_LUN:
1557 case TCM_UNSUPPORTED_SCSI_OPCODE:
1558 case TCM_INVALID_CDB_FIELD:
1559 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1560 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1561 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1562 case TCM_UNKNOWN_MODE_PAGE:
1563 case TCM_WRITE_PROTECTED:
e2397c70 1564 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1565 case TCM_CHECK_CONDITION_ABORT_CMD:
1566 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1567 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1568 break;
de103c93
CH		 1569 case TCM_OUT_OF_RESOURCES:
1570 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1571 break;
03e98c9e 1572 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1573 /*
1574 * No SENSE Data payload for this case, set SCSI Status
1575 * and queue the response to $FABRIC_MOD.
1576 *
1577 * Uses linux/include/scsi/scsi.h SAM status codes defs
1578 */
1579 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1580 /*
1581 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1582 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1583 * CONFLICT STATUS.
1584 *
1585 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1586 */
e3d6f909 1587 if (cmd->se_sess &&
0fd97ccf 1588 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1589 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1590 cmd->orig_fe_lun, 0x2C,
1591 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1592
e5c0d6ad
RD		 1593 trace_target_cmd_complete(cmd);
1594 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1595 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1596 goto queue_full;
c66ac9db 1597 goto check_stop;
c66ac9db 1598 default:
6708bb27 1599 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1600 cmd->t_task_cdb[0], sense_reason);
1601 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1602 break;
1603 }
f3146437 1604
de103c93 1605 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1606 if (ret == -EAGAIN || ret == -ENOMEM)
1607 goto queue_full;
07bde79a 1608
c66ac9db
NB		 1609check_stop:
1610 transport_lun_remove_cmd(cmd);
6708bb27 1611 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1612 ;
07bde79a
NB		 1613 return;
1614
1615queue_full:
e057f533
CH		 1616 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1617 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1618}
2fbff127 1619EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1620
76dde50e 1621void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1622{
de103c93 1623 sense_reason_t ret;
5f41a31d 1624
de103c93
CH		 1625 if (cmd->execute_cmd) {
1626 ret = cmd->execute_cmd(cmd);
1627 if (ret) {
1628 spin_lock_irq(&cmd->t_state_lock);
1629 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1630 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1631
de103c93
CH		 1632 transport_generic_request_failure(cmd, ret);
1633 }
5f41a31d
CH		 1634 }
1635}
1636
019c4ca6 1637static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1638{
1639 struct se_device *dev = cmd->se_dev;
1640
019c4ca6
CH		 1641 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1642 return false;
5f41a31d 1643
c66ac9db 1644 /*
25985edc 1645 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1646 * to allow the passed struct se_cmd list of tasks to the front of the list.
1647 */
5f41a31d
CH		 1648 switch (cmd->sam_task_attr) {
1649 case MSG_HEAD_TAG:
1650 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1651 "se_ordered_id: %u\n",
1652 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1653 return false;
5f41a31d
CH		 1654 case MSG_ORDERED_TAG:
1655 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1656 smp_mb__after_atomic_inc();
1657
5f41a31d
CH		 1658 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1659 " se_ordered_id: %u\n",
1660 cmd->t_task_cdb[0], cmd->se_ordered_id);
1661
c66ac9db 1662 /*
5f41a31d
CH		 1663 * Execute an ORDERED command if no other older commands
1664 * exist that need to be completed first.
c66ac9db 1665 */
5f41a31d 1666 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1667 return false;
5f41a31d
CH		 1668 break;
1669 default:
c66ac9db
NB		 1670 /*
1671 * For SIMPLE and UNTAGGED Task Attribute commands
1672 */
5f41a31d 1673 atomic_inc(&dev->simple_cmds);
c66ac9db 1674 smp_mb__after_atomic_inc();
5f41a31d 1675 break;
c66ac9db 1676 }
5f41a31d 1677
019c4ca6
CH		 1678 if (atomic_read(&dev->dev_ordered_sync) == 0)
1679 return false;
c66ac9db 1680
019c4ca6
CH		 1681 spin_lock(&dev->delayed_cmd_lock);
1682 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1683 spin_unlock(&dev->delayed_cmd_lock);
1684
1685 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1686 " delayed CMD list, se_ordered_id: %u\n",
1687 cmd->t_task_cdb[0], cmd->sam_task_attr,
1688 cmd->se_ordered_id);
1689 return true;
1690}
1691
1692void target_execute_cmd(struct se_cmd *cmd)
1693{
1694 /*
1695 * If the received CDB has aleady been aborted stop processing it here.
1696 */
4a9a6c8d 1697 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1698 return;
c66ac9db 1699
019c4ca6
CH		 1700 /*
1701 * Determine if frontend context caller is requesting the stopping of
1702 * this command for frontend exceptions.
1703 */
4a9a6c8d 1704 spin_lock_irq(&cmd->t_state_lock);
019c4ca6
CH		 1705 if (cmd->transport_state & CMD_T_STOP) {
1706 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1707 __func__, __LINE__,
1708 cmd->se_tfo->get_task_tag(cmd));
1709
1710 spin_unlock_irq(&cmd->t_state_lock);
1711 complete(&cmd->t_transport_stop_comp);
1712 return;
1713 }
1714
1715 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1716 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6
CH		 1717 spin_unlock_irq(&cmd->t_state_lock);
1718
1a398b97
NB		 1719 if (target_handle_task_attr(cmd)) {
1720 spin_lock_irq(&cmd->t_state_lock);
1721 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1722 spin_unlock_irq(&cmd->t_state_lock);
1723 return;
1724 }
1725
1726 __target_execute_cmd(cmd);
c66ac9db 1727}
70baf0ab 1728EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1729
5f41a31d
CH		 1730/*
1731 * Process all commands up to the last received ORDERED task attribute which
1732 * requires another blocking boundary
1733 */
1734static void target_restart_delayed_cmds(struct se_device *dev)
1735{
1736 for (;;) {
1737 struct se_cmd *cmd;
1738
1739 spin_lock(&dev->delayed_cmd_lock);
1740 if (list_empty(&dev->delayed_cmd_list)) {
1741 spin_unlock(&dev->delayed_cmd_lock);
1742 break;
1743 }
1744
1745 cmd = list_entry(dev->delayed_cmd_list.next,
1746 struct se_cmd, se_delayed_node);
1747 list_del(&cmd->se_delayed_node);
1748 spin_unlock(&dev->delayed_cmd_lock);
1749
1750 __target_execute_cmd(cmd);
1751
1752 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1753 break;
1754 }
1755}
1756
c66ac9db 1757/*
35e0e757 1758 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1759 * and ordered cmds need to have their tasks added to the execution queue.
1760 */
1761static void transport_complete_task_attr(struct se_cmd *cmd)
1762{
5951146d 1763 struct se_device *dev = cmd->se_dev;
c66ac9db 1764
019c4ca6
CH		 1765 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1766 return;
1767
e66ecd50 1768 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1769 atomic_dec(&dev->simple_cmds);
1770 smp_mb__after_atomic_dec();
1771 dev->dev_cur_ordered_id++;
6708bb27 1772 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1773 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1774 cmd->se_ordered_id);
e66ecd50 1775 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1776 dev->dev_cur_ordered_id++;
6708bb27 1777 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1778 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1779 cmd->se_ordered_id);
e66ecd50 1780 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1781 atomic_dec(&dev->dev_ordered_sync);
1782 smp_mb__after_atomic_dec();
c66ac9db
NB		 1783
1784 dev->dev_cur_ordered_id++;
6708bb27 1785 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1786 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1787 }
c66ac9db 1788
5f41a31d 1789 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1790}
1791
e057f533 1792static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1793{
1794 int ret = 0;
1795
019c4ca6 1796 transport_complete_task_attr(cmd);
e057f533
CH		 1797
1798 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1799 trace_target_cmd_complete(cmd);
e057f533
CH		 1800 ret = cmd->se_tfo->queue_status(cmd);
1801 if (ret)
1802 goto out;
1803 }
07bde79a
NB		 1804
1805 switch (cmd->data_direction) {
1806 case DMA_FROM_DEVICE:
e5c0d6ad 1807 trace_target_cmd_complete(cmd);
07bde79a
NB		 1808 ret = cmd->se_tfo->queue_data_in(cmd);
1809 break;
1810 case DMA_TO_DEVICE:
64577407 1811 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a
NB		 1812 ret = cmd->se_tfo->queue_data_in(cmd);
1813 if (ret < 0)
e057f533 1814 break;
07bde79a
NB		 1815 }
1816 /* Fall through for DMA_TO_DEVICE */
1817 case DMA_NONE:
e5c0d6ad 1818 trace_target_cmd_complete(cmd);
07bde79a
NB		 1819 ret = cmd->se_tfo->queue_status(cmd);
1820 break;
1821 default:
1822 break;
1823 }
1824
e057f533
CH		 1825out:
1826 if (ret < 0) {
1827 transport_handle_queue_full(cmd, cmd->se_dev);
1828 return;
1829 }
1830 transport_lun_remove_cmd(cmd);
1831 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1832}
1833
1834static void transport_handle_queue_full(
1835 struct se_cmd *cmd,
e057f533 1836 struct se_device *dev)
07bde79a
NB		 1837{
1838 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1839 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1840 atomic_inc(&dev->dev_qf_count);
1841 smp_mb__after_atomic_inc();
1842 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1843
1844 schedule_work(&cmd->se_dev->qf_work_queue);
1845}
1846
35e0e757 1847static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1848{
35e0e757 1849 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1850 int ret;
35e0e757 1851
c66ac9db
NB		 1852 /*
1853 * Check if we need to move delayed/dormant tasks from cmds on the
1854 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1855 * Attribute.
1856 */
019c4ca6
CH		 1857 transport_complete_task_attr(cmd);
1858
07bde79a
NB		 1859 /*
1860 * Check to schedule QUEUE_FULL work, or execute an existing
1861 * cmd->transport_qf_callback()
1862 */
1863 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1864 schedule_work(&cmd->se_dev->qf_work_queue);
1865
c66ac9db 1866 /*
d5829eac 1867 * Check if we need to send a sense buffer from
c66ac9db
NB		 1868 * the struct se_cmd in question.
1869 */
1870 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1871 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1872 ret = transport_send_check_condition_and_sense(
1873 cmd, 0, 1);
1874 if (ret == -EAGAIN || ret == -ENOMEM)
1875 goto queue_full;
1876
1877 transport_lun_remove_cmd(cmd);
1878 transport_cmd_check_stop_to_fabric(cmd);
1879 return;
c66ac9db
NB		 1880 }
1881 /*
25985edc 1882 * Check for a callback, used by amongst other things
a6b0133c 1883 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 1884 */
a6b0133c
NB		 1885 if (cmd->transport_complete_callback) {
1886 sense_reason_t rc;
1887
1888 rc = cmd->transport_complete_callback(cmd);
a2890087 1889 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
a6b0133c 1890 return;
a2890087
NB		 1891 } else if (rc) {
1892 ret = transport_send_check_condition_and_sense(cmd,
1893 rc, 0);
1894 if (ret == -EAGAIN || ret == -ENOMEM)
1895 goto queue_full;
a6b0133c 1896
a2890087
NB		 1897 transport_lun_remove_cmd(cmd);
1898 transport_cmd_check_stop_to_fabric(cmd);
1899 return;
1900 }
a6b0133c 1901 }
c66ac9db
NB		 1902
1903 switch (cmd->data_direction) {
1904 case DMA_FROM_DEVICE:
1905 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1906 if (cmd->se_lun->lun_sep) {
1907 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1908 cmd->data_length;
1909 }
1910 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1911
e5c0d6ad 1912 trace_target_cmd_complete(cmd);
07bde79a 1913 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1914 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1915 goto queue_full;
c66ac9db
NB		 1916 break;
1917 case DMA_TO_DEVICE:
1918 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1919 if (cmd->se_lun->lun_sep) {
1920 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1921 cmd->data_length;
1922 }
1923 spin_unlock(&cmd->se_lun->lun_sep_lock);
1924 /*
1925 * Check if we need to send READ payload for BIDI-COMMAND
1926 */
64577407 1927 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 1928 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1929 if (cmd->se_lun->lun_sep) {
1930 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1931 cmd->data_length;
1932 }
1933 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1934 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1935 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1936 goto queue_full;
c66ac9db
NB		 1937 break;
1938 }
1939 /* Fall through for DMA_TO_DEVICE */
1940 case DMA_NONE:
e5c0d6ad 1941 trace_target_cmd_complete(cmd);
07bde79a 1942 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1943 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1944 goto queue_full;
c66ac9db
NB		 1945 break;
1946 default:
1947 break;
1948 }
1949
1950 transport_lun_remove_cmd(cmd);
1951 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1952 return;
1953
1954queue_full:
6708bb27 1955 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1956 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1957 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1958 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1959}
1960
6708bb27 1961static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1962{
ec98f782 1963 struct scatterlist *sg;
ec98f782 1964 int count;
c66ac9db 1965
6708bb27
AG		 1966 for_each_sg(sgl, sg, nents, count)
1967 __free_page(sg_page(sg));
c66ac9db 1968
6708bb27
AG		 1969 kfree(sgl);
1970}
c66ac9db 1971
47e459e6
NB		 1972static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
1973{
1974 /*
1975 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
1976 * emulation, and free + reset pointers if necessary..
1977 */
1978 if (!cmd->t_data_sg_orig)
1979 return;
1980
1981 kfree(cmd->t_data_sg);
1982 cmd->t_data_sg = cmd->t_data_sg_orig;
1983 cmd->t_data_sg_orig = NULL;
1984 cmd->t_data_nents = cmd->t_data_nents_orig;
1985 cmd->t_data_nents_orig = 0;
1986}
1987
6708bb27
AG		 1988static inline void transport_free_pages(struct se_cmd *cmd)
1989{
47e459e6
NB		 1990 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
1991 transport_reset_sgl_orig(cmd);
6708bb27 1992 return;
47e459e6
NB		 1993 }
1994 transport_reset_sgl_orig(cmd);
6708bb27
AG		 1995
1996 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 1997 cmd->t_data_sg = NULL;
1998 cmd->t_data_nents = 0;
c66ac9db 1999
6708bb27 2000 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2001 cmd->t_bidi_data_sg = NULL;
2002 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2003}
2004
e26d99ae
CH		 2005/**
2006 * transport_release_cmd - free a command
2007 * @cmd: command to free
2008 *
2009 * This routine unconditionally frees a command, and reference counting
2010 * or list removal must be done in the caller.
2011 */
d5ddad41 2012static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2013{
2014 BUG_ON(!cmd->se_tfo);
2015
c8e31f26 2016 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2017 core_tmr_release_req(cmd->se_tmr_req);
2018 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2019 kfree(cmd->t_task_cdb);
2020 /*
7481deb4
NB		 2021 * If this cmd has been setup with target_get_sess_cmd(), drop
2022 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2023 */
ca24976a 2024 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2025}
2026
d3df7825
CH		 2027/**
2028 * transport_put_cmd - release a reference to a command
2029 * @cmd: command to release
2030 *
2031 * This routine releases our reference to the command and frees it if possible.
2032 */
d5ddad41 2033static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2034{
c66ac9db 2035 transport_free_pages(cmd);
d5ddad41 2036 return transport_release_cmd(cmd);
c66ac9db 2037}
c66ac9db 2038
4949314c 2039void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2040{
ec98f782 2041 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2042 struct page **pages;
2043 int i;
05d1c7c0
AG		 2044
2045 /*
ec98f782
AG		 2046 * We need to take into account a possible offset here for fabrics like
2047 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2048 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2049 */
4949314c
AG		 2050 if (!cmd->t_data_nents)
2051 return NULL;
3717ef0c
PB		 2052
2053 BUG_ON(!sg);
2054 if (cmd->t_data_nents == 1)
4949314c
AG		 2055 return kmap(sg_page(sg)) + sg->offset;
2056
2057 /* >1 page. use vmap */
2058 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2059 if (!pages)
4949314c
AG		 2060 return NULL;
2061
2062 /* convert sg[] to pages[] */
2063 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2064 pages[i] = sg_page(sg);
2065 }
2066
2067 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2068 kfree(pages);
de103c93 2069 if (!cmd->t_data_vmap)
4949314c
AG		 2070 return NULL;
2071
2072 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2073}
4949314c 2074EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2075
4949314c 2076void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2077{
a1edf9cf 2078 if (!cmd->t_data_nents) {
4949314c 2079 return;
a1edf9cf 2080 } else if (cmd->t_data_nents == 1) {
4949314c 2081 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2082 return;
2083 }
4949314c
AG		 2084
2085 vunmap(cmd->t_data_vmap);
2086 cmd->t_data_vmap = NULL;
05d1c7c0 2087}
4949314c 2088EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2089
c5ff8d6b 2090int
20093994
NB		 2091target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2092 bool zero_page)
c66ac9db 2093{
20093994 2094 struct scatterlist *sg;
ec98f782 2095 struct page *page;
20093994
NB		 2096 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2097 unsigned int nent;
ec98f782 2098 int i = 0;
c66ac9db 2099
20093994
NB		 2100 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2101 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2102 if (!sg)
ec98f782 2103 return -ENOMEM;
c66ac9db 2104
20093994 2105 sg_init_table(sg, nent);
9db9da33 2106
ec98f782
AG		 2107 while (length) {
2108 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2109 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2110 if (!page)
2111 goto out;
c66ac9db 2112
20093994 2113 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2114 length -= page_len;
2115 i++;
c66ac9db 2116 }
20093994
NB		 2117 *sgl = sg;
2118 *nents = nent;
c66ac9db 2119 return 0;
c66ac9db 2120
ec98f782 2121out:
d0e27c88 2122 while (i > 0) {
ec98f782 2123 i--;
20093994 2124 __free_page(sg_page(&sg[i]));
c66ac9db 2125 }
20093994 2126 kfree(sg);
ec98f782 2127 return -ENOMEM;
c66ac9db
NB		 2128}
2129
da0f7619 2130/*
b16a35b0
AG		 2131 * Allocate any required resources to execute the command. For writes we
2132 * might not have the payload yet, so notify the fabric via a call to
2133 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2134 */
de103c93
CH		 2135sense_reason_t
2136transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2137{
c66ac9db
NB		 2138 int ret = 0;
2139
2140 /*
2141 * Determine is the TCM fabric module has already allocated physical
2142 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2143 * beforehand.
c66ac9db 2144 */
ec98f782
AG		 2145 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2146 cmd->data_length) {
20093994
NB		 2147 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2148
8cefe07b
NB		 2149 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2150 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2151 u32 bidi_length;
2152
2153 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2154 bidi_length = cmd->t_task_nolb *
2155 cmd->se_dev->dev_attrib.block_size;
2156 else
2157 bidi_length = cmd->data_length;
2158
2159 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2160 &cmd->t_bidi_data_nents,
2161 bidi_length, zero_flag);
2162 if (ret < 0)
2163 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2164 }
2165
20093994
NB		 2166 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2167 cmd->data_length, zero_flag);
c66ac9db 2168 if (ret < 0)
de103c93 2169 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2170 }
c66ac9db 2171 /*
c3196f0c
CH		 2172 * If this command is not a write we can execute it right here,
2173 * for write buffers we need to notify the fabric driver first
2174 * and let it call back once the write buffers are ready.
c66ac9db 2175 */
5f41a31d 2176 target_add_to_state_list(cmd);
c3196f0c
CH		 2177 if (cmd->data_direction != DMA_TO_DEVICE) {
2178 target_execute_cmd(cmd);
2179 return 0;
2180 }
862e6389 2181 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2182
2183 ret = cmd->se_tfo->write_pending(cmd);
2184 if (ret == -EAGAIN || ret == -ENOMEM)
2185 goto queue_full;
2186
de103c93
CH		 2187 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2188 WARN_ON(ret);
2189
b69c1fcf 2190 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2191
c3196f0c
CH		 2192queue_full:
2193 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2194 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2195 transport_handle_queue_full(cmd, cmd->se_dev);
2196 return 0;
c66ac9db 2197}
a1d8b49a 2198EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2199
e057f533 2200static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2201{
f147abb4
NB		 2202 int ret;
2203
2204 ret = cmd->se_tfo->write_pending(cmd);
2205 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2206 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2207 cmd);
2208 transport_handle_queue_full(cmd, cmd->se_dev);
2209 }
07bde79a
NB		 2210}
2211
d5ddad41 2212int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2213{
c130480b 2214 unsigned long flags;
d5ddad41
NB		 2215 int ret = 0;
2216
d14921d6 2217 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2218 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2219 transport_wait_for_tasks(cmd);
2220
d5ddad41 2221 ret = transport_release_cmd(cmd);
d14921d6
NB		 2222 } else {
2223 if (wait_for_tasks)
2224 transport_wait_for_tasks(cmd);
c130480b
NB		 2225 /*
2226 * Handle WRITE failure case where transport_generic_new_cmd()
2227 * has already added se_cmd to state_list, but fabric has
2228 * failed command before I/O submission.
2229 */
2230 if (cmd->state_active) {
2231 spin_lock_irqsave(&cmd->t_state_lock, flags);
2232 target_remove_from_state_list(cmd);
2233 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2234 }
d14921d6 2235
82f1c8a4 2236 if (cmd->se_lun)
c66ac9db 2237 transport_lun_remove_cmd(cmd);
c66ac9db 2238
d5ddad41 2239 ret = transport_put_cmd(cmd);
c66ac9db 2240 }
d5ddad41 2241 return ret;
c66ac9db
NB		 2242}
2243EXPORT_SYMBOL(transport_generic_free_cmd);
2244
a17f091d
NB		 2245/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2246 * @se_sess: session to reference
2247 * @se_cmd: command descriptor to add
a6360785 2248 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2249 */
20361e69 2250int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2251 bool ack_kref)
a17f091d
NB		 2252{
2253 unsigned long flags;
bc187ea6 2254 int ret = 0;
a17f091d 2255
7481deb4 2256 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2257 /*
2258 * Add a second kref if the fabric caller is expecting to handle
2259 * fabric acknowledgement that requires two target_put_sess_cmd()
2260 * invocations before se_cmd descriptor release.
2261 */
86715569 2262 if (ack_kref == true) {
a6360785 2263 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2264 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2265 }
7481deb4 2266
a17f091d 2267 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2268 if (se_sess->sess_tearing_down) {
2269 ret = -ESHUTDOWN;
2270 goto out;
2271 }
a17f091d 2272 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2273out:
a17f091d 2274 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2275 return ret;
a17f091d 2276}
20361e69 2277EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2278
7481deb4 2279static void target_release_cmd_kref(struct kref *kref)
a17f091d 2280{
7481deb4
NB		 2281 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2282 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2283
a17f091d 2284 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2285 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2286 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2287 return;
a17f091d 2288 }
a17f091d 2289 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2290 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2291 complete(&se_cmd->cmd_wait_comp);
7481deb4 2292 return;
a17f091d
NB		 2293 }
2294 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2295 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2296
7481deb4
NB		 2297 se_cmd->se_tfo->release_cmd(se_cmd);
2298}
2299
2300/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2301 * @se_sess: session to reference
2302 * @se_cmd: command descriptor to drop
2303 */
2304int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2305{
ccf5ae83
JE		 2306 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2307 &se_sess->sess_cmd_lock);
a17f091d
NB		 2308}
2309EXPORT_SYMBOL(target_put_sess_cmd);
2310
1c7b13fe
RD		 2311/* target_sess_cmd_list_set_waiting - Flag all commands in
2312 * sess_cmd_list to complete cmd_wait_comp. Set
2313 * sess_tearing_down so no more commands are queued.
2314 * @se_sess: session to flag
a17f091d 2315 */
1c7b13fe 2316void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2317{
2318 struct se_cmd *se_cmd;
2319 unsigned long flags;
2320
a17f091d 2321 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2322 if (se_sess->sess_tearing_down) {
2323 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2324 return;
2325 }
1c7b13fe 2326 se_sess->sess_tearing_down = 1;
9b31a328 2327 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2328
9b31a328 2329 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2330 se_cmd->cmd_wait_set = 1;
2331
2332 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2333}
1c7b13fe 2334EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2335
2336/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2337 * @se_sess: session to wait for active I/O
a17f091d 2338 */
be646c2d 2339void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2340{
2341 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2342 unsigned long flags;
a17f091d
NB		 2343
2344 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2345 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2346 list_del(&se_cmd->se_cmd_list);
2347
2348 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2349 " %d\n", se_cmd, se_cmd->t_state,
2350 se_cmd->se_tfo->get_cmd_state(se_cmd));
2351
be646c2d
JE		 2352 wait_for_completion(&se_cmd->cmd_wait_comp);
2353 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2354 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2355 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2356
2357 se_cmd->se_tfo->release_cmd(se_cmd);
2358 }
9b31a328
NB		 2359
2360 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2361 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2362 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2363
a17f091d
NB		 2364}
2365EXPORT_SYMBOL(target_wait_for_sess_cmds);
2366
5277797d 2367static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2368{
8359cf43 2369 struct se_lun *lun = p;
c66ac9db 2370
5277797d
NB		 2371 percpu_ref_kill(&lun->lun_ref);
2372
2373 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2374 complete(&lun->lun_shutdown_comp);
2375
2376 return 0;
2377}
2378
5277797d 2379int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2380{
2381 struct task_struct *kt;
2382
5277797d 2383 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2384 "tcm_cl_%u", lun->unpacked_lun);
2385 if (IS_ERR(kt)) {
6708bb27 2386 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2387 return PTR_ERR(kt);
c66ac9db
NB		 2388 }
2389 wait_for_completion(&lun->lun_shutdown_comp);
2390
2391 return 0;
2392}
2393
d14921d6
NB		 2394/**
2395 * transport_wait_for_tasks - wait for completion to occur
2396 * @cmd: command to wait
c66ac9db 2397 *
d14921d6
NB		 2398 * Called from frontend fabric context to wait for storage engine
2399 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2400 */
a17f091d 2401bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2402{
2403 unsigned long flags;
2404
a1d8b49a 2405 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2406 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2407 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2408 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2409 return false;
d14921d6 2410 }
cb4f4d3c 2411
c8e31f26
AG		 2412 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2413 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2414 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2415 return false;
d14921d6 2416 }
7d680f3b 2417
3d28934a 2418 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2419 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2420 return false;
d14921d6 2421 }
c66ac9db 2422
7d680f3b 2423 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2424
6708bb27 2425 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2426 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2427 cmd, cmd->se_tfo->get_task_tag(cmd),
2428 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2429
a1d8b49a 2430 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2431
a1d8b49a 2432 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2433
a1d8b49a 2434 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2435 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2436
35d1efe8 2437 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2438 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2439 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2440
d14921d6 2441 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2442
2443 return true;
c66ac9db 2444}
d14921d6 2445EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2446
2447static int transport_get_sense_codes(
2448 struct se_cmd *cmd,
2449 u8 *asc,
2450 u8 *ascq)
2451{
2452 *asc = cmd->scsi_asc;
2453 *ascq = cmd->scsi_ascq;
2454
2455 return 0;
2456}
2457
de103c93
CH		 2458int
2459transport_send_check_condition_and_sense(struct se_cmd *cmd,
2460 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2461{
2462 unsigned char *buffer = cmd->sense_buffer;
2463 unsigned long flags;
c66ac9db
NB		 2464 u8 asc = 0, ascq = 0;
2465
a1d8b49a 2466 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2467 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2468 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2469 return 0;
2470 }
2471 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2472 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2473
2474 if (!reason && from_transport)
2475 goto after_reason;
2476
2477 if (!from_transport)
2478 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2479
c66ac9db
NB		 2480 /*
2481 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2482 * SENSE KEY values from include/scsi/scsi.h
2483 */
2484 switch (reason) {
ba829137
HR		 2485 case TCM_NO_SENSE:
2486 /* CURRENT ERROR */
2487 buffer[0] = 0x70;
2488 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2489 /* Not Ready */
2490 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2491 /* NO ADDITIONAL SENSE INFORMATION */
2492 buffer[SPC_ASC_KEY_OFFSET] = 0;
2493 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2494 break;
c66ac9db 2495 case TCM_NON_EXISTENT_LUN:
eb39d340 2496 /* CURRENT ERROR */
9c58b7dd
RD		 2497 buffer[0] = 0x70;
2498 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2499 /* ILLEGAL REQUEST */
9c58b7dd 2500 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2501 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2502 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2503 break;
c66ac9db
NB		 2504 case TCM_UNSUPPORTED_SCSI_OPCODE:
2505 case TCM_SECTOR_COUNT_TOO_MANY:
2506 /* CURRENT ERROR */
9c58b7dd
RD		 2507 buffer[0] = 0x70;
2508 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2509 /* ILLEGAL REQUEST */
9c58b7dd 2510 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2511 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2512 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2513 break;
2514 case TCM_UNKNOWN_MODE_PAGE:
2515 /* CURRENT ERROR */
9c58b7dd
RD		 2516 buffer[0] = 0x70;
2517 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2518 /* ILLEGAL REQUEST */
9c58b7dd 2519 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2520 /* INVALID FIELD IN CDB */
9c58b7dd 2521 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2522 break;
2523 case TCM_CHECK_CONDITION_ABORT_CMD:
2524 /* CURRENT ERROR */
9c58b7dd
RD		 2525 buffer[0] = 0x70;
2526 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2527 /* ABORTED COMMAND */
9c58b7dd 2528 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2529 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2530 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2531 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2532 break;
2533 case TCM_INCORRECT_AMOUNT_OF_DATA:
2534 /* CURRENT ERROR */
9c58b7dd
RD		 2535 buffer[0] = 0x70;
2536 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2537 /* ABORTED COMMAND */
9c58b7dd 2538 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2539 /* WRITE ERROR */
9c58b7dd 2540 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2541 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2542 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2543 break;
2544 case TCM_INVALID_CDB_FIELD:
2545 /* CURRENT ERROR */
9c58b7dd
RD		 2546 buffer[0] = 0x70;
2547 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2548 /* ILLEGAL REQUEST */
9c58b7dd 2549 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2550 /* INVALID FIELD IN CDB */
9c58b7dd 2551 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2552 break;
2553 case TCM_INVALID_PARAMETER_LIST:
2554 /* CURRENT ERROR */
9c58b7dd
RD		 2555 buffer[0] = 0x70;
2556 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2557 /* ILLEGAL REQUEST */
9c58b7dd 2558 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2559 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2560 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2561 break;
bb992e72
RD		 2562 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2563 /* CURRENT ERROR */
2564 buffer[0] = 0x70;
2565 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2566 /* ILLEGAL REQUEST */
2567 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2568 /* PARAMETER LIST LENGTH ERROR */
2569 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2570 break;
c66ac9db
NB		 2571 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2572 /* CURRENT ERROR */
9c58b7dd
RD		 2573 buffer[0] = 0x70;
2574 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2575 /* ABORTED COMMAND */
9c58b7dd 2576 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2577 /* WRITE ERROR */
9c58b7dd 2578 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2579 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2580 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2581 break;
2582 case TCM_SERVICE_CRC_ERROR:
2583 /* CURRENT ERROR */
9c58b7dd
RD		 2584 buffer[0] = 0x70;
2585 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2586 /* ABORTED COMMAND */
9c58b7dd 2587 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2588 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2589 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2590 /* N/A */
9c58b7dd 2591 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2592 break;
2593 case TCM_SNACK_REJECTED:
2594 /* CURRENT ERROR */
9c58b7dd
RD		 2595 buffer[0] = 0x70;
2596 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2597 /* ABORTED COMMAND */
9c58b7dd 2598 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2599 /* READ ERROR */
9c58b7dd 2600 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2601 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2602 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2603 break;
2604 case TCM_WRITE_PROTECTED:
2605 /* CURRENT ERROR */
9c58b7dd
RD		 2606 buffer[0] = 0x70;
2607 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2608 /* DATA PROTECT */
9c58b7dd 2609 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2610 /* WRITE PROTECTED */
9c58b7dd 2611 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2612 break;
e2397c70
RD		 2613 case TCM_ADDRESS_OUT_OF_RANGE:
2614 /* CURRENT ERROR */
9c58b7dd
RD		 2615 buffer[0] = 0x70;
2616 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2617 /* ILLEGAL REQUEST */
9c58b7dd 2618 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2619 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2620 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2621 break;
c66ac9db
NB		 2622 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2623 /* CURRENT ERROR */
9c58b7dd
RD		 2624 buffer[0] = 0x70;
2625 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2626 /* UNIT ATTENTION */
9c58b7dd 2627 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2628 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2629 buffer[SPC_ASC_KEY_OFFSET] = asc;
2630 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2631 break;
2632 case TCM_CHECK_CONDITION_NOT_READY:
2633 /* CURRENT ERROR */
9c58b7dd
RD		 2634 buffer[0] = 0x70;
2635 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2636 /* Not Ready */
9c58b7dd 2637 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2638 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2639 buffer[SPC_ASC_KEY_OFFSET] = asc;
2640 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2641 break;
818b571c
NB		 2642 case TCM_MISCOMPARE_VERIFY:
2643 /* CURRENT ERROR */
2644 buffer[0] = 0x70;
2645 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2646 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2647 /* MISCOMPARE DURING VERIFY OPERATION */
2648 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2649 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2650 break;
c66ac9db
NB		 2651 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2652 default:
2653 /* CURRENT ERROR */
9c58b7dd
RD		 2654 buffer[0] = 0x70;
2655 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2656 /*
2657 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2658 * Solaris initiators. Returning NOT READY instead means the
2659 * operations will be retried a finite number of times and we
2660 * can survive intermittent errors.
2661 */
2662 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2663 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2664 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2665 break;
2666 }
2667 /*
2668 * This code uses linux/include/scsi/scsi.h SAM status codes!
2669 */
2670 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2671 /*
2672 * Automatically padded, this value is encoded in the fabric's
2673 * data_length response PDU containing the SCSI defined sense data.
2674 */
9c58b7dd 2675 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2676
2677after_reason:
e5c0d6ad 2678 trace_target_cmd_complete(cmd);
07bde79a 2679 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2680}
2681EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2682
2683int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2684{
c18bc7d8
RD		 2685 if (!(cmd->transport_state & CMD_T_ABORTED))
2686 return 0;
c66ac9db 2687
c18bc7d8
RD		 2688 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2689 return 1;
8b1e1244 2690
c18bc7d8
RD		 2691 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2692 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2693
c18bc7d8 2694 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
29f4c090 2695 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2696 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2697 cmd->se_tfo->queue_status(cmd);
2698
2699 return 1;
c66ac9db
NB		 2700}
2701EXPORT_SYMBOL(transport_check_aborted_status);
2702
2703void transport_send_task_abort(struct se_cmd *cmd)
2704{
c252f003
NB		 2705 unsigned long flags;
2706
2707 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2708 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2709 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2710 return;
2711 }
2712 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2713
c66ac9db
NB		 2714 /*
2715 * If there are still expected incoming fabric WRITEs, we wait
2716 * until until they have completed before sending a TASK_ABORTED
2717 * response. This response with TASK_ABORTED status will be
2718 * queued back to fabric module by transport_check_aborted_status().
2719 */
2720 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2721 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2722 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2723 smp_mb__after_atomic_inc();
29f4c090 2724 return;
c66ac9db
NB		 2725 }
2726 }
2727 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2728
72b59d6e
RD		 2729 transport_lun_remove_cmd(cmd);
2730
6708bb27 2731 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2732 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2733 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2734
e5c0d6ad 2735 trace_target_cmd_complete(cmd);
e3d6f909 2736 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2737}
2738
af877292 2739static void target_tmr_work(struct work_struct *work)
c66ac9db 2740{
af877292 2741 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2742 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2743 struct se_tmr_req *tmr = cmd->se_tmr_req;
2744 int ret;
2745
2746 switch (tmr->function) {
5c6cd613 2747 case TMR_ABORT_TASK:
3d28934a 2748 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2749 break;
5c6cd613
NB		 2750 case TMR_ABORT_TASK_SET:
2751 case TMR_CLEAR_ACA:
2752 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2753 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2754 break;
5c6cd613 2755 case TMR_LUN_RESET:
c66ac9db
NB		 2756 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2757 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2758 TMR_FUNCTION_REJECTED;
2759 break;
5c6cd613 2760 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2761 tmr->response = TMR_FUNCTION_REJECTED;
2762 break;
5c6cd613 2763 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2764 tmr->response = TMR_FUNCTION_REJECTED;
2765 break;
c66ac9db 2766 default:
6708bb27 2767 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2768 tmr->function);
2769 tmr->response = TMR_FUNCTION_REJECTED;
2770 break;
2771 }
2772
2773 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2774 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2775
b7b8bef7 2776 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2777}
2778
af877292
CH		 2779int transport_generic_handle_tmr(
2780 struct se_cmd *cmd)
c66ac9db 2781{
af877292
CH		 2782 INIT_WORK(&cmd->work, target_tmr_work);
2783 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2784 return 0;
2785}
af877292 2786EXPORT_SYMBOL(transport_generic_handle_tmr);
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