projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
percpu-refcount: Add percpu-refcount.o to obj-y
[GitHub/exynos8895/android_kernel_samsung_universal8895.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
238 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, GFP_KERNEL);
239 if (!se_sess->sess_cmd_map) {
240 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
241 return -ENOMEM;
242 }
243
244 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
245 if (rc < 0) {
246 pr_err("Unable to init se_sess->sess_tag_pool,"
247 " tag_num: %u\n", tag_num);
248 kfree(se_sess->sess_cmd_map);
249 se_sess->sess_cmd_map = NULL;
250 return -ENOMEM;
251 }
252
253 return 0;
254}
255EXPORT_SYMBOL(transport_alloc_session_tags);
256
257struct se_session *transport_init_session_tags(unsigned int tag_num,
258 unsigned int tag_size)
259{
260 struct se_session *se_sess;
261 int rc;
262
263 se_sess = transport_init_session();
264 if (IS_ERR(se_sess))
265 return se_sess;
266
267 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
268 if (rc < 0) {
269 transport_free_session(se_sess);
270 return ERR_PTR(-ENOMEM);
271 }
272
273 return se_sess;
274}
275EXPORT_SYMBOL(transport_init_session_tags);
276
c66ac9db 277/*
140854cb 278 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 279 */
280void __transport_register_session(
281 struct se_portal_group *se_tpg,
282 struct se_node_acl *se_nacl,
283 struct se_session *se_sess,
284 void *fabric_sess_ptr)
285{
286 unsigned char buf[PR_REG_ISID_LEN];
287
288 se_sess->se_tpg = se_tpg;
289 se_sess->fabric_sess_ptr = fabric_sess_ptr;
290 /*
291 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
292 *
293 * Only set for struct se_session's that will actually be moving I/O.
294 * eg: *NOT* discovery sessions.
295 */
296 if (se_nacl) {
297 /*
298 * If the fabric module supports an ISID based TransportID,
299 * save this value in binary from the fabric I_T Nexus now.
300 */
e3d6f909 301 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 302 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 303 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 304 &buf[0], PR_REG_ISID_LEN);
305 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
306 }
afb999ff
NB		 307 kref_get(&se_nacl->acl_kref);
308
c66ac9db
NB		 309 spin_lock_irq(&se_nacl->nacl_sess_lock);
310 /*
311 * The se_nacl->nacl_sess pointer will be set to the
312 * last active I_T Nexus for each struct se_node_acl.
313 */
314 se_nacl->nacl_sess = se_sess;
315
316 list_add_tail(&se_sess->sess_acl_list,
317 &se_nacl->acl_sess_list);
318 spin_unlock_irq(&se_nacl->nacl_sess_lock);
319 }
320 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
321
6708bb27 322 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 323 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 324}
325EXPORT_SYMBOL(__transport_register_session);
326
327void transport_register_session(
328 struct se_portal_group *se_tpg,
329 struct se_node_acl *se_nacl,
330 struct se_session *se_sess,
331 void *fabric_sess_ptr)
332{
140854cb
NB		 333 unsigned long flags;
334
335 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 336 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 337 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 338}
339EXPORT_SYMBOL(transport_register_session);
340
ecf0dd66 341static void target_release_session(struct kref *kref)
41ac82b6
NB		 342{
343 struct se_session *se_sess = container_of(kref,
344 struct se_session, sess_kref);
345 struct se_portal_group *se_tpg = se_sess->se_tpg;
346
347 se_tpg->se_tpg_tfo->close_session(se_sess);
348}
349
350void target_get_session(struct se_session *se_sess)
351{
352 kref_get(&se_sess->sess_kref);
353}
354EXPORT_SYMBOL(target_get_session);
355
33933a0e 356void target_put_session(struct se_session *se_sess)
41ac82b6 357{
4149268e
JE		 358 struct se_portal_group *tpg = se_sess->se_tpg;
359
360 if (tpg->se_tpg_tfo->put_session != NULL) {
361 tpg->se_tpg_tfo->put_session(se_sess);
362 return;
363 }
33933a0e 364 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 365}
366EXPORT_SYMBOL(target_put_session);
367
afb999ff
NB		 368static void target_complete_nacl(struct kref *kref)
369{
370 struct se_node_acl *nacl = container_of(kref,
371 struct se_node_acl, acl_kref);
372
373 complete(&nacl->acl_free_comp);
374}
375
376void target_put_nacl(struct se_node_acl *nacl)
377{
378 kref_put(&nacl->acl_kref, target_complete_nacl);
379}
380
c66ac9db
NB		 381void transport_deregister_session_configfs(struct se_session *se_sess)
382{
383 struct se_node_acl *se_nacl;
23388864 384 unsigned long flags;
c66ac9db
NB		 385 /*
386 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
387 */
388 se_nacl = se_sess->se_node_acl;
6708bb27 389 if (se_nacl) {
23388864 390 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 391 if (se_nacl->acl_stop == 0)
392 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 393 /*
394 * If the session list is empty, then clear the pointer.
395 * Otherwise, set the struct se_session pointer from the tail
396 * element of the per struct se_node_acl active session list.
397 */
398 if (list_empty(&se_nacl->acl_sess_list))
399 se_nacl->nacl_sess = NULL;
400 else {
401 se_nacl->nacl_sess = container_of(
402 se_nacl->acl_sess_list.prev,
403 struct se_session, sess_acl_list);
404 }
23388864 405 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 406 }
407}
408EXPORT_SYMBOL(transport_deregister_session_configfs);
409
410void transport_free_session(struct se_session *se_sess)
411{
c0add7fd
NB		 412 if (se_sess->sess_cmd_map) {
413 percpu_ida_destroy(&se_sess->sess_tag_pool);
414 kfree(se_sess->sess_cmd_map);
415 }
c66ac9db
NB		 416 kmem_cache_free(se_sess_cache, se_sess);
417}
418EXPORT_SYMBOL(transport_free_session);
419
420void transport_deregister_session(struct se_session *se_sess)
421{
422 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 423 struct target_core_fabric_ops *se_tfo;
c66ac9db 424 struct se_node_acl *se_nacl;
e63a8e19 425 unsigned long flags;
01468346 426 bool comp_nacl = true;
c66ac9db 427
6708bb27 428 if (!se_tpg) {
c66ac9db
NB		 429 transport_free_session(se_sess);
430 return;
431 }
01468346 432 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 433
e63a8e19 434 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 435 list_del(&se_sess->sess_list);
436 se_sess->se_tpg = NULL;
437 se_sess->fabric_sess_ptr = NULL;
e63a8e19 438 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 439
440 /*
441 * Determine if we need to do extra work for this initiator node's
442 * struct se_node_acl if it had been previously dynamically generated.
443 */
444 se_nacl = se_sess->se_node_acl;
01468346
NB		 445
446 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
447 if (se_nacl && se_nacl->dynamic_node_acl) {
448 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
449 list_del(&se_nacl->acl_list);
450 se_tpg->num_node_acls--;
451 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
452 core_tpg_wait_for_nacl_pr_ref(se_nacl);
453 core_free_device_list_for_node(se_nacl, se_tpg);
454 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
455
456 comp_nacl = false;
457 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 458 }
c66ac9db 459 }
01468346 460 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 461
6708bb27 462 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 463 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 464 /*
afb999ff
NB		 465 * If last kref is dropping now for an explict NodeACL, awake sleeping
466 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
467 * removal context.
01468346
NB		 468 */
469 if (se_nacl && comp_nacl == true)
afb999ff 470 target_put_nacl(se_nacl);
01468346 471
afb999ff 472 transport_free_session(se_sess);
c66ac9db
NB		 473}
474EXPORT_SYMBOL(transport_deregister_session);
475
476/*
a1d8b49a 477 * Called with cmd->t_state_lock held.
c66ac9db 478 */
cf572a96 479static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 480{
42bf829e 481 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 482 unsigned long flags;
483
42bf829e
CH		 484 if (!dev)
485 return;
c66ac9db 486
cf572a96
CH		 487 if (cmd->transport_state & CMD_T_BUSY)
488 return;
c66ac9db 489
cf572a96
CH		 490 spin_lock_irqsave(&dev->execute_task_lock, flags);
491 if (cmd->state_active) {
492 list_del(&cmd->state_list);
cf572a96 493 cmd->state_active = false;
c66ac9db 494 }
cf572a96 495 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 496}
497
862e6389
NB		 498static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
499 bool write_pending)
c66ac9db
NB		 500{
501 unsigned long flags;
502
a1d8b49a 503 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 504 if (write_pending)
505 cmd->t_state = TRANSPORT_WRITE_PENDING;
506
f7113a47
CH		 507 if (remove_from_lists) {
508 target_remove_from_state_list(cmd);
509
510 /*
511 * Clear struct se_cmd->se_lun before the handoff to FE.
512 */
513 cmd->se_lun = NULL;
514 }
515
c66ac9db
NB		 516 /*
517 * Determine if frontend context caller is requesting the stopping of
e3d6f909 518 * this command for frontend exceptions.
c66ac9db 519 */
7d680f3b
CH		 520 if (cmd->transport_state & CMD_T_STOP) {
521 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
522 __func__, __LINE__,
e3d6f909 523 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 524
a1d8b49a 525 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 526
a1d8b49a 527 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 528 return 1;
529 }
f7113a47
CH		 530
531 cmd->transport_state &= ~CMD_T_ACTIVE;
532 if (remove_from_lists) {
533 /*
534 * Some fabric modules like tcm_loop can release
535 * their internally allocated I/O reference now and
536 * struct se_cmd now.
537 *
538 * Fabric modules are expected to return '1' here if the
539 * se_cmd being passed is released at this point,
540 * or zero if not being released.
541 */
542 if (cmd->se_tfo->check_stop_free != NULL) {
543 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
544 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 545 }
f7113a47 546 }
c66ac9db 547
a1d8b49a 548 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 549 return 0;
550}
551
552static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
553{
862e6389 554 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 555}
556
557static void transport_lun_remove_cmd(struct se_cmd *cmd)
558{
e3d6f909 559 struct se_lun *lun = cmd->se_lun;
c66ac9db 560
5277797d 561 if (!lun || !cmd->lun_ref_active)
c66ac9db
NB		 562 return;
563
5277797d 564 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 565}
566
567void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
568{
c66ac9db
NB		 569 if (transport_cmd_check_stop_to_fabric(cmd))
570 return;
af877292 571 if (remove)
e6a2573f 572 transport_put_cmd(cmd);
c66ac9db
NB		 573}
574
35e0e757
CH		 575static void target_complete_failure_work(struct work_struct *work)
576{
577 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
578
de103c93
CH		 579 transport_generic_request_failure(cmd,
580 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 581}
582
6138ed2a 583/*
d5829eac
PB		 584 * Used when asking transport to copy Sense Data from the underlying
585 * Linux/SCSI struct scsi_cmnd
6138ed2a 586 */
d5829eac 587static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 588{
6138ed2a 589 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 590
591 WARN_ON(!cmd->se_lun);
592
593 if (!dev)
d5829eac 594 return NULL;
6138ed2a 595
d5829eac
PB		 596 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
597 return NULL;
6138ed2a 598
9c58b7dd 599 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 600
d5829eac 601 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 602 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 603 return cmd->sense_buffer;
6138ed2a
PB		 604}
605
5787cacd 606void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 607{
42bf829e 608 struct se_device *dev = cmd->se_dev;
5787cacd 609 int success = scsi_status == GOOD;
c66ac9db 610 unsigned long flags;
c66ac9db 611
5787cacd
CH		 612 cmd->scsi_status = scsi_status;
613
614
a1d8b49a 615 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 616 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 617
c66ac9db 618 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 619 dev->transport->transport_complete(cmd,
620 cmd->t_data_sg,
621 transport_get_sense_buffer(cmd));
622 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 623 success = 1;
c66ac9db
NB		 624 }
625
626 /*
5787cacd 627 * See if we are waiting to complete for an exception condition.
c66ac9db 628 */
cf572a96 629 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 631 complete(&cmd->task_stop_comp);
c66ac9db
NB		 632 return;
633 }
2235007c
CH		 634
635 if (!success)
7d680f3b 636 cmd->transport_state |= CMD_T_FAILED;
2235007c 637
3d28934a
NB		 638 /*
639 * Check for case where an explict ABORT_TASK has been received
640 * and transport_wait_for_tasks() will be waiting for completion..
641 */
642 if (cmd->transport_state & CMD_T_ABORTED &&
643 cmd->transport_state & CMD_T_STOP) {
644 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
645 complete(&cmd->t_transport_stop_comp);
646 return;
647 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 648 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 649 } else {
35e0e757 650 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 651 }
35e0e757 652
35e0e757 653 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 654 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 655 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 656
35e0e757 657 queue_work(target_completion_wq, &cmd->work);
c66ac9db 658}
6bb35e00
CH		 659EXPORT_SYMBOL(target_complete_cmd);
660
cf572a96 661static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 662{
cf572a96
CH		 663 struct se_device *dev = cmd->se_dev;
664 unsigned long flags;
c66ac9db 665
cf572a96
CH		 666 spin_lock_irqsave(&dev->execute_task_lock, flags);
667 if (!cmd->state_active) {
668 list_add_tail(&cmd->state_list, &dev->state_list);
669 cmd->state_active = true;
c66ac9db 670 }
cf572a96 671 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 672}
673
07bde79a 674/*
f147abb4 675 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 676 */
7a6f0a1e
CH		 677static void transport_write_pending_qf(struct se_cmd *cmd);
678static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 679
0fd97ccf 680void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 681{
682 struct se_device *dev = container_of(work, struct se_device,
683 qf_work_queue);
bcac364a 684 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 685 struct se_cmd *cmd, *cmd_tmp;
686
687 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 688 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
689 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 690
bcac364a 691 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 692 list_del(&cmd->se_qf_node);
693 atomic_dec(&dev->dev_qf_count);
694 smp_mb__after_atomic_dec();
07bde79a 695
6708bb27 696 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 697 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 698 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 699 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
700 : "UNKNOWN");
f7a5cc0b 701
7a6f0a1e
CH		 702 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
703 transport_write_pending_qf(cmd);
704 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
705 transport_complete_qf(cmd);
07bde79a 706 }
07bde79a
NB		 707}
708
c66ac9db
NB		 709unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
710{
711 switch (cmd->data_direction) {
712 case DMA_NONE:
713 return "NONE";
714 case DMA_FROM_DEVICE:
715 return "READ";
716 case DMA_TO_DEVICE:
717 return "WRITE";
718 case DMA_BIDIRECTIONAL:
719 return "BIDI";
720 default:
721 break;
722 }
723
724 return "UNKNOWN";
725}
726
727void transport_dump_dev_state(
728 struct se_device *dev,
729 char *b,
730 int *bl)
731{
732 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 733 if (dev->export_count)
c66ac9db 734 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 735 else
c66ac9db 736 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 737
5f41a31d 738 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 739 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 740 dev->dev_attrib.block_size,
741 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 742 *bl += sprintf(b + *bl, " ");
743}
744
c66ac9db
NB		 745void transport_dump_vpd_proto_id(
746 struct t10_vpd *vpd,
747 unsigned char *p_buf,
748 int p_buf_len)
749{
750 unsigned char buf[VPD_TMP_BUF_SIZE];
751 int len;
752
753 memset(buf, 0, VPD_TMP_BUF_SIZE);
754 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
755
756 switch (vpd->protocol_identifier) {
757 case 0x00:
758 sprintf(buf+len, "Fibre Channel\n");
759 break;
760 case 0x10:
761 sprintf(buf+len, "Parallel SCSI\n");
762 break;
763 case 0x20:
764 sprintf(buf+len, "SSA\n");
765 break;
766 case 0x30:
767 sprintf(buf+len, "IEEE 1394\n");
768 break;
769 case 0x40:
770 sprintf(buf+len, "SCSI Remote Direct Memory Access"
771 " Protocol\n");
772 break;
773 case 0x50:
774 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
775 break;
776 case 0x60:
777 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
778 break;
779 case 0x70:
780 sprintf(buf+len, "Automation/Drive Interface Transport"
781 " Protocol\n");
782 break;
783 case 0x80:
784 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
785 break;
786 default:
787 sprintf(buf+len, "Unknown 0x%02x\n",
788 vpd->protocol_identifier);
789 break;
790 }
791
792 if (p_buf)
793 strncpy(p_buf, buf, p_buf_len);
794 else
6708bb27 795 pr_debug("%s", buf);
c66ac9db
NB		 796}
797
798void
799transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
800{
801 /*
802 * Check if the Protocol Identifier Valid (PIV) bit is set..
803 *
804 * from spc3r23.pdf section 7.5.1
805 */
806 if (page_83[1] & 0x80) {
807 vpd->protocol_identifier = (page_83[0] & 0xf0);
808 vpd->protocol_identifier_set = 1;
809 transport_dump_vpd_proto_id(vpd, NULL, 0);
810 }
811}
812EXPORT_SYMBOL(transport_set_vpd_proto_id);
813
814int transport_dump_vpd_assoc(
815 struct t10_vpd *vpd,
816 unsigned char *p_buf,
817 int p_buf_len)
818{
819 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 820 int ret = 0;
821 int len;
c66ac9db
NB		 822
823 memset(buf, 0, VPD_TMP_BUF_SIZE);
824 len = sprintf(buf, "T10 VPD Identifier Association: ");
825
826 switch (vpd->association) {
827 case 0x00:
828 sprintf(buf+len, "addressed logical unit\n");
829 break;
830 case 0x10:
831 sprintf(buf+len, "target port\n");
832 break;
833 case 0x20:
834 sprintf(buf+len, "SCSI target device\n");
835 break;
836 default:
837 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 838 ret = -EINVAL;
c66ac9db
NB		 839 break;
840 }
841
842 if (p_buf)
843 strncpy(p_buf, buf, p_buf_len);
844 else
6708bb27 845 pr_debug("%s", buf);
c66ac9db
NB		 846
847 return ret;
848}
849
850int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
851{
852 /*
853 * The VPD identification association..
854 *
855 * from spc3r23.pdf Section 7.6.3.1 Table 297
856 */
857 vpd->association = (page_83[1] & 0x30);
858 return transport_dump_vpd_assoc(vpd, NULL, 0);
859}
860EXPORT_SYMBOL(transport_set_vpd_assoc);
861
862int transport_dump_vpd_ident_type(
863 struct t10_vpd *vpd,
864 unsigned char *p_buf,
865 int p_buf_len)
866{
867 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 868 int ret = 0;
869 int len;
c66ac9db
NB		 870
871 memset(buf, 0, VPD_TMP_BUF_SIZE);
872 len = sprintf(buf, "T10 VPD Identifier Type: ");
873
874 switch (vpd->device_identifier_type) {
875 case 0x00:
876 sprintf(buf+len, "Vendor specific\n");
877 break;
878 case 0x01:
879 sprintf(buf+len, "T10 Vendor ID based\n");
880 break;
881 case 0x02:
882 sprintf(buf+len, "EUI-64 based\n");
883 break;
884 case 0x03:
885 sprintf(buf+len, "NAA\n");
886 break;
887 case 0x04:
888 sprintf(buf+len, "Relative target port identifier\n");
889 break;
890 case 0x08:
891 sprintf(buf+len, "SCSI name string\n");
892 break;
893 default:
894 sprintf(buf+len, "Unsupported: 0x%02x\n",
895 vpd->device_identifier_type);
e3d6f909 896 ret = -EINVAL;
c66ac9db
NB		 897 break;
898 }
899
e3d6f909
AG		 900 if (p_buf) {
901 if (p_buf_len < strlen(buf)+1)
902 return -EINVAL;
c66ac9db 903 strncpy(p_buf, buf, p_buf_len);
e3d6f909 904 } else {
6708bb27 905 pr_debug("%s", buf);
e3d6f909 906 }
c66ac9db
NB		 907
908 return ret;
909}
910
911int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
912{
913 /*
914 * The VPD identifier type..
915 *
916 * from spc3r23.pdf Section 7.6.3.1 Table 298
917 */
918 vpd->device_identifier_type = (page_83[1] & 0x0f);
919 return transport_dump_vpd_ident_type(vpd, NULL, 0);
920}
921EXPORT_SYMBOL(transport_set_vpd_ident_type);
922
923int transport_dump_vpd_ident(
924 struct t10_vpd *vpd,
925 unsigned char *p_buf,
926 int p_buf_len)
927{
928 unsigned char buf[VPD_TMP_BUF_SIZE];
929 int ret = 0;
930
931 memset(buf, 0, VPD_TMP_BUF_SIZE);
932
933 switch (vpd->device_identifier_code_set) {
934 case 0x01: /* Binary */
703d641d
DC		 935 snprintf(buf, sizeof(buf),
936 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 937 &vpd->device_identifier[0]);
938 break;
939 case 0x02: /* ASCII */
703d641d
DC		 940 snprintf(buf, sizeof(buf),
941 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 942 &vpd->device_identifier[0]);
943 break;
944 case 0x03: /* UTF-8 */
703d641d
DC		 945 snprintf(buf, sizeof(buf),
946 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 947 &vpd->device_identifier[0]);
948 break;
949 default:
950 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
951 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 952 ret = -EINVAL;
c66ac9db
NB		 953 break;
954 }
955
956 if (p_buf)
957 strncpy(p_buf, buf, p_buf_len);
958 else
6708bb27 959 pr_debug("%s", buf);
c66ac9db
NB		 960
961 return ret;
962}
963
964int
965transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
966{
967 static const char hex_str[] = "0123456789abcdef";
35d1efe8 968 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 969
970 /*
971 * The VPD Code Set (encoding)
972 *
973 * from spc3r23.pdf Section 7.6.3.1 Table 296
974 */
975 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
976 switch (vpd->device_identifier_code_set) {
977 case 0x01: /* Binary */
978 vpd->device_identifier[j++] =
979 hex_str[vpd->device_identifier_type];
980 while (i < (4 + page_83[3])) {
981 vpd->device_identifier[j++] =
982 hex_str[(page_83[i] & 0xf0) >> 4];
983 vpd->device_identifier[j++] =
984 hex_str[page_83[i] & 0x0f];
985 i++;
986 }
987 break;
988 case 0x02: /* ASCII */
989 case 0x03: /* UTF-8 */
990 while (i < (4 + page_83[3]))
991 vpd->device_identifier[j++] = page_83[i++];
992 break;
993 default:
994 break;
995 }
996
997 return transport_dump_vpd_ident(vpd, NULL, 0);
998}
999EXPORT_SYMBOL(transport_set_vpd_ident);
1000
de103c93
CH		 1001sense_reason_t
1002target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1003{
1004 struct se_device *dev = cmd->se_dev;
1005
1006 if (cmd->unknown_data_length) {
1007 cmd->data_length = size;
1008 } else if (size != cmd->data_length) {
1009 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1010 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1011 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1012 cmd->data_length, size, cmd->t_task_cdb[0]);
1013
9b3b8041
CH		 1014 if (cmd->data_direction == DMA_TO_DEVICE) {
1015 pr_err("Rejecting underflow/overflow"
1016 " WRITE data\n");
de103c93 1017 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1018 }
1019 /*
1020 * Reject READ_* or WRITE_* with overflow/underflow for
1021 * type SCF_SCSI_DATA_CDB.
1022 */
0fd97ccf 1023 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1024 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1025 " CDB on non 512-byte sector setup subsystem"
1026 " plugin: %s\n", dev->transport->name);
1027 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1028 return TCM_INVALID_CDB_FIELD;
9b3b8041 1029 }
4c054ba6
NB		 1030 /*
1031 * For the overflow case keep the existing fabric provided
1032 * ->data_length. Otherwise for the underflow case, reset
1033 * ->data_length to the smaller SCSI expected data transfer
1034 * length.
1035 */
9b3b8041
CH		 1036 if (size > cmd->data_length) {
1037 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1038 cmd->residual_count = (size - cmd->data_length);
1039 } else {
1040 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1041 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1042 cmd->data_length = size;
9b3b8041 1043 }
9b3b8041
CH		 1044 }
1045
1046 return 0;
1047
9b3b8041
CH		 1048}
1049
c66ac9db
NB		 1050/*
1051 * Used by fabric modules containing a local struct se_cmd within their
1052 * fabric dependent per I/O descriptor.
1053 */
1054void transport_init_se_cmd(
1055 struct se_cmd *cmd,
1056 struct target_core_fabric_ops *tfo,
1057 struct se_session *se_sess,
1058 u32 data_length,
1059 int data_direction,
1060 int task_attr,
1061 unsigned char *sense_buffer)
1062{
5951146d 1063 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1064 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1065 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1066 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1067 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1068 init_completion(&cmd->cmd_wait_comp);
cf572a96 1069 init_completion(&cmd->task_stop_comp);
a1d8b49a 1070 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1071 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1072
1073 cmd->se_tfo = tfo;
1074 cmd->se_sess = se_sess;
1075 cmd->data_length = data_length;
1076 cmd->data_direction = data_direction;
1077 cmd->sam_task_attr = task_attr;
1078 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1079
1080 cmd->state_active = false;
c66ac9db
NB		 1081}
1082EXPORT_SYMBOL(transport_init_se_cmd);
1083
de103c93
CH		 1084static sense_reason_t
1085transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1086{
019c4ca6
CH		 1087 struct se_device *dev = cmd->se_dev;
1088
c66ac9db
NB		 1089 /*
1090 * Check if SAM Task Attribute emulation is enabled for this
1091 * struct se_device storage object
1092 */
019c4ca6 1093 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1094 return 0;
1095
e66ecd50 1096 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1097 pr_debug("SAM Task Attribute ACA"
c66ac9db 1098 " emulation is not supported\n");
de103c93 1099 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1100 }
1101 /*
1102 * Used to determine when ORDERED commands should go from
1103 * Dormant to Active status.
1104 */
019c4ca6 1105 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1106 smp_mb__after_atomic_inc();
6708bb27 1107 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1108 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1109 dev->transport->name);
c66ac9db
NB		 1110 return 0;
1111}
1112
de103c93
CH		 1113sense_reason_t
1114target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1115{
0fd97ccf 1116 struct se_device *dev = cmd->se_dev;
de103c93 1117 sense_reason_t ret;
c66ac9db 1118
c66ac9db
NB		 1119 /*
1120 * Ensure that the received CDB is less than the max (252 + 8) bytes
1121 * for VARIABLE_LENGTH_CMD
1122 */
1123 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1124 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1125 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1126 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1127 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1128 }
1129 /*
1130 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1131 * allocate the additional extended CDB buffer now.. Otherwise
1132 * setup the pointer from __t_task_cdb to t_task_cdb.
1133 */
a1d8b49a
AG		 1134 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1135 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1136 GFP_KERNEL);
6708bb27
AG		 1137 if (!cmd->t_task_cdb) {
1138 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1139 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1140 scsi_command_size(cdb),
a1d8b49a 1141 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1142 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1143 }
1144 } else
a1d8b49a 1145 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1146 /*
a1d8b49a 1147 * Copy the original CDB into cmd->
c66ac9db 1148 */
a1d8b49a 1149 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1150
e5c0d6ad
RD		 1151 trace_target_sequencer_start(cmd);
1152
cb4f4d3c
CH		 1153 /*
1154 * Check for an existing UNIT ATTENTION condition
1155 */
de103c93
CH		 1156 ret = target_scsi3_ua_check(cmd);
1157 if (ret)
1158 return ret;
cb4f4d3c 1159
c87fbd56 1160 ret = target_alua_state_check(cmd);
de103c93
CH		 1161 if (ret)
1162 return ret;
cb4f4d3c 1163
d977f437 1164 ret = target_check_reservation(cmd);
f85eda8d
NB		 1165 if (ret) {
1166 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1167 return ret;
f85eda8d 1168 }
cb4f4d3c 1169
0fd97ccf 1170 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1171 if (ret)
1172 return ret;
1173
1174 ret = transport_check_alloc_task_attr(cmd);
1175 if (ret)
c66ac9db 1176 return ret;
cb4f4d3c 1177
cb4f4d3c 1178 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1179
c66ac9db
NB		 1180 spin_lock(&cmd->se_lun->lun_sep_lock);
1181 if (cmd->se_lun->lun_sep)
1182 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1183 spin_unlock(&cmd->se_lun->lun_sep_lock);
1184 return 0;
1185}
a12f41f8 1186EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1187
695434e1
NB		 1188/*
1189 * Used by fabric module frontends to queue tasks directly.
1190 * Many only be used from process context only
1191 */
1192int transport_handle_cdb_direct(
1193 struct se_cmd *cmd)
1194{
de103c93 1195 sense_reason_t ret;
dd8ae59d 1196
695434e1
NB		 1197 if (!cmd->se_lun) {
1198 dump_stack();
6708bb27 1199 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1200 return -EINVAL;
1201 }
1202 if (in_interrupt()) {
1203 dump_stack();
6708bb27 1204 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1205 " from interrupt context\n");
1206 return -EINVAL;
1207 }
dd8ae59d 1208 /*
af877292
CH		 1209 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1210 * outstanding descriptors are handled correctly during shutdown via
1211 * transport_wait_for_tasks()
dd8ae59d
NB		 1212 *
1213 * Also, we don't take cmd->t_state_lock here as we only expect
1214 * this to be called for initial descriptor submission.
1215 */
1216 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1217 cmd->transport_state |= CMD_T_ACTIVE;
1218
dd8ae59d
NB		 1219 /*
1220 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1221 * so follow TRANSPORT_NEW_CMD processing thread context usage
1222 * and call transport_generic_request_failure() if necessary..
1223 */
1224 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1225 if (ret)
1226 transport_generic_request_failure(cmd, ret);
dd8ae59d 1227 return 0;
695434e1
NB		 1228}
1229EXPORT_SYMBOL(transport_handle_cdb_direct);
1230
c5ff8d6b 1231sense_reason_t
de103c93
CH		 1232transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1233 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1234{
1235 if (!sgl || !sgl_count)
1236 return 0;
1237
1238 /*
1239 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1240 * scatterlists already have been set to follow what the fabric
1241 * passes for the original expected data transfer length.
1242 */
1243 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1244 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1245 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1246 return TCM_INVALID_CDB_FIELD;
1247 }
1248
1249 cmd->t_data_sg = sgl;
1250 cmd->t_data_nents = sgl_count;
1251
1252 if (sgl_bidi && sgl_bidi_count) {
1253 cmd->t_bidi_data_sg = sgl_bidi;
1254 cmd->t_bidi_data_nents = sgl_bidi_count;
1255 }
1256 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1257 return 0;
1258}
1259
a026757f
NB		 1260/*
1261 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1262 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1263 *
1264 * @se_cmd: command descriptor to submit
1265 * @se_sess: associated se_sess for endpoint
1266 * @cdb: pointer to SCSI CDB
1267 * @sense: pointer to SCSI sense buffer
1268 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1269 * @data_length: fabric expected data transfer length
1270 * @task_addr: SAM task attribute
1271 * @data_dir: DMA data direction
1272 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1273 * @sgl: struct scatterlist memory for unidirectional mapping
1274 * @sgl_count: scatterlist count for unidirectional mapping
1275 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1276 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1277 *
d6dfc868
RD		 1278 * Returns non zero to signal active I/O shutdown failure. All other
1279 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1280 * but still return zero here.
1281 *
a6360785
NB		 1282 * This may only be called from process context, and also currently
1283 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1284 */
1285int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1286 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1287 u32 data_length, int task_attr, int data_dir, int flags,
1288 struct scatterlist *sgl, u32 sgl_count,
1289 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1290{
1291 struct se_portal_group *se_tpg;
de103c93
CH		 1292 sense_reason_t rc;
1293 int ret;
a6360785
NB		 1294
1295 se_tpg = se_sess->se_tpg;
1296 BUG_ON(!se_tpg);
1297 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1298 BUG_ON(in_interrupt());
1299 /*
1300 * Initialize se_cmd for target operation. From this point
1301 * exceptions are handled by sending exception status via
1302 * target_core_fabric_ops->queue_status() callback
1303 */
1304 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1305 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1306 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1307 se_cmd->unknown_data_length = 1;
a6360785
NB		 1308 /*
1309 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1310 * se_sess->sess_cmd_list. A second kref_get here is necessary
1311 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1312 * kref_put() to happen during fabric packet acknowledgement.
1313 */
de103c93
CH		 1314 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1315 if (ret)
1316 return ret;
a6360785
NB		 1317 /*
1318 * Signal bidirectional data payloads to target-core
1319 */
1320 if (flags & TARGET_SCF_BIDI_OP)
1321 se_cmd->se_cmd_flags |= SCF_BIDI;
1322 /*
1323 * Locate se_lun pointer and attach it to struct se_cmd
1324 */
de103c93
CH		 1325 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1326 if (rc) {
1327 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1328 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1329 return 0;
735703ca 1330 }
d6e0175c 1331
a12f41f8 1332 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1333 if (rc != 0) {
de103c93 1334 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1335 return 0;
735703ca 1336 }
a026757f
NB		 1337 /*
1338 * When a non zero sgl_count has been passed perform SGL passthrough
1339 * mapping for pre-allocated fabric memory instead of having target
1340 * core perform an internal SGL allocation..
1341 */
1342 if (sgl_count != 0) {
1343 BUG_ON(!sgl);
1344
944981c7
NB		 1345 /*
1346 * A work-around for tcm_loop as some userspace code via
1347 * scsi-generic do not memset their associated read buffers,
1348 * so go ahead and do that here for type non-data CDBs. Also
1349 * note that this is currently guaranteed to be a single SGL
1350 * for this case by target core in target_setup_cmd_from_cdb()
1351 * -> transport_generic_cmd_sequencer().
1352 */
1353 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1354 se_cmd->data_direction == DMA_FROM_DEVICE) {
1355 unsigned char *buf = NULL;
1356
1357 if (sgl)
1358 buf = kmap(sg_page(sgl)) + sgl->offset;
1359
1360 if (buf) {
1361 memset(buf, 0, sgl->length);
1362 kunmap(sg_page(sgl));
1363 }
1364 }
1365
a026757f
NB		 1366 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1367 sgl_bidi, sgl_bidi_count);
1368 if (rc != 0) {
de103c93 1369 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1370 return 0;
1371 }
1372 }
11e319ed
AG		 1373 /*
1374 * Check if we need to delay processing because of ALUA
1375 * Active/NonOptimized primary access state..
1376 */
1377 core_alua_check_nonop_delay(se_cmd);
1378
a6360785 1379 transport_handle_cdb_direct(se_cmd);
d6dfc868 1380 return 0;
a6360785 1381}
a026757f
NB		 1382EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1383
1384/*
1385 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1386 *
1387 * @se_cmd: command descriptor to submit
1388 * @se_sess: associated se_sess for endpoint
1389 * @cdb: pointer to SCSI CDB
1390 * @sense: pointer to SCSI sense buffer
1391 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1392 * @data_length: fabric expected data transfer length
1393 * @task_addr: SAM task attribute
1394 * @data_dir: DMA data direction
1395 * @flags: flags for command submission from target_sc_flags_tables
1396 *
1397 * Returns non zero to signal active I/O shutdown failure. All other
1398 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1399 * but still return zero here.
1400 *
1401 * This may only be called from process context, and also currently
1402 * assumes internal allocation of fabric payload buffer by target-core.
1403 *
1404 * It also assumes interal target core SGL memory allocation.
1405 */
1406int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1407 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1408 u32 data_length, int task_attr, int data_dir, int flags)
1409{
1410 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1411 unpacked_lun, data_length, task_attr, data_dir,
1412 flags, NULL, 0, NULL, 0);
1413}
a6360785
NB		 1414EXPORT_SYMBOL(target_submit_cmd);
1415
9f0d05c2
NB		 1416static void target_complete_tmr_failure(struct work_struct *work)
1417{
1418 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1419
1420 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1421 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1422
1423 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1424}
1425
ea98d7f9
AG		 1426/**
1427 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1428 * for TMR CDBs
1429 *
1430 * @se_cmd: command descriptor to submit
1431 * @se_sess: associated se_sess for endpoint
1432 * @sense: pointer to SCSI sense buffer
1433 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1434 * @fabric_context: fabric context for TMR req
1435 * @tm_type: Type of TM request
c0974f89
NB		 1436 * @gfp: gfp type for caller
1437 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1438 * @flags: submit cmd flags
ea98d7f9
AG		 1439 *
1440 * Callable from all contexts.
1441 **/
1442
c7042cae 1443int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1444 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1445 void *fabric_tmr_ptr, unsigned char tm_type,
1446 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1447{
1448 struct se_portal_group *se_tpg;
1449 int ret;
1450
1451 se_tpg = se_sess->se_tpg;
1452 BUG_ON(!se_tpg);
1453
1454 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1455 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1456 /*
1457 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1458 * allocation failure.
1459 */
c0974f89 1460 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1461 if (ret < 0)
1462 return -ENOMEM;
ea98d7f9 1463
c0974f89
NB		 1464 if (tm_type == TMR_ABORT_TASK)
1465 se_cmd->se_tmr_req->ref_task_tag = tag;
1466
ea98d7f9 1467 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1468 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1469 if (ret) {
1470 core_tmr_release_req(se_cmd->se_tmr_req);
1471 return ret;
1472 }
ea98d7f9 1473
ea98d7f9
AG		 1474 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1475 if (ret) {
9f0d05c2
NB		 1476 /*
1477 * For callback during failure handling, push this work off
1478 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1479 */
1480 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1481 schedule_work(&se_cmd->work);
c7042cae 1482 return 0;
ea98d7f9
AG		 1483 }
1484 transport_generic_handle_tmr(se_cmd);
c7042cae 1485 return 0;
ea98d7f9
AG		 1486}
1487EXPORT_SYMBOL(target_submit_tmr);
1488
cdbb70bb 1489/*
cf572a96 1490 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1491 * has completed.
1492 */
cf572a96 1493bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1494{
cdbb70bb
CH		 1495 bool was_active = false;
1496
cf572a96
CH		 1497 if (cmd->transport_state & CMD_T_BUSY) {
1498 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1499 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1500
cf572a96
CH		 1501 pr_debug("cmd %p waiting to complete\n", cmd);
1502 wait_for_completion(&cmd->task_stop_comp);
1503 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1504
1505 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1506 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1507 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1508 was_active = true;
1509 }
1510
cdbb70bb
CH		 1511 return was_active;
1512}
1513
c66ac9db
NB		 1514/*
1515 * Handle SAM-esque emulation for generic transport request failures.
1516 */
de103c93
CH		 1517void transport_generic_request_failure(struct se_cmd *cmd,
1518 sense_reason_t sense_reason)
c66ac9db 1519{
07bde79a
NB		 1520 int ret = 0;
1521
6708bb27 1522 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1523 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1524 cmd->t_task_cdb[0]);
de103c93 1525 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1526 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1527 cmd->t_state, sense_reason);
d43d6aea 1528 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1529 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1530 (cmd->transport_state & CMD_T_STOP) != 0,
1531 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1532
c66ac9db
NB		 1533 /*
1534 * For SAM Task Attribute emulation for failed struct se_cmd
1535 */
019c4ca6 1536 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1537 /*
1538 * Handle special case for COMPARE_AND_WRITE failure, where the
1539 * callback is expected to drop the per device ->caw_mutex.
1540 */
1541 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1542 cmd->transport_complete_callback)
1543 cmd->transport_complete_callback(cmd);
c66ac9db 1544
de103c93 1545 switch (sense_reason) {
03e98c9e
NB		 1546 case TCM_NON_EXISTENT_LUN:
1547 case TCM_UNSUPPORTED_SCSI_OPCODE:
1548 case TCM_INVALID_CDB_FIELD:
1549 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1550 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1551 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1552 case TCM_UNKNOWN_MODE_PAGE:
1553 case TCM_WRITE_PROTECTED:
e2397c70 1554 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1555 case TCM_CHECK_CONDITION_ABORT_CMD:
1556 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1557 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1558 break;
de103c93
CH		 1559 case TCM_OUT_OF_RESOURCES:
1560 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1561 break;
03e98c9e 1562 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1563 /*
1564 * No SENSE Data payload for this case, set SCSI Status
1565 * and queue the response to $FABRIC_MOD.
1566 *
1567 * Uses linux/include/scsi/scsi.h SAM status codes defs
1568 */
1569 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1570 /*
1571 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1572 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1573 * CONFLICT STATUS.
1574 *
1575 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1576 */
e3d6f909 1577 if (cmd->se_sess &&
0fd97ccf 1578 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1579 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1580 cmd->orig_fe_lun, 0x2C,
1581 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1582
e5c0d6ad
RD		 1583 trace_target_cmd_complete(cmd);
1584 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1585 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1586 goto queue_full;
c66ac9db 1587 goto check_stop;
c66ac9db 1588 default:
6708bb27 1589 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1590 cmd->t_task_cdb[0], sense_reason);
1591 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1592 break;
1593 }
f3146437 1594
de103c93 1595 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1596 if (ret == -EAGAIN || ret == -ENOMEM)
1597 goto queue_full;
07bde79a 1598
c66ac9db
NB		 1599check_stop:
1600 transport_lun_remove_cmd(cmd);
6708bb27 1601 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1602 ;
07bde79a
NB		 1603 return;
1604
1605queue_full:
e057f533
CH		 1606 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1607 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1608}
2fbff127 1609EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1610
76dde50e 1611void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1612{
de103c93 1613 sense_reason_t ret;
5f41a31d 1614
de103c93
CH		 1615 if (cmd->execute_cmd) {
1616 ret = cmd->execute_cmd(cmd);
1617 if (ret) {
1618 spin_lock_irq(&cmd->t_state_lock);
1619 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1620 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1621
de103c93
CH		 1622 transport_generic_request_failure(cmd, ret);
1623 }
5f41a31d
CH		 1624 }
1625}
1626
019c4ca6 1627static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1628{
1629 struct se_device *dev = cmd->se_dev;
1630
019c4ca6
CH		 1631 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1632 return false;
5f41a31d 1633
c66ac9db 1634 /*
25985edc 1635 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1636 * to allow the passed struct se_cmd list of tasks to the front of the list.
1637 */
5f41a31d
CH		 1638 switch (cmd->sam_task_attr) {
1639 case MSG_HEAD_TAG:
1640 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1641 "se_ordered_id: %u\n",
1642 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1643 return false;
5f41a31d
CH		 1644 case MSG_ORDERED_TAG:
1645 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1646 smp_mb__after_atomic_inc();
1647
5f41a31d
CH		 1648 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1649 " se_ordered_id: %u\n",
1650 cmd->t_task_cdb[0], cmd->se_ordered_id);
1651
c66ac9db 1652 /*
5f41a31d
CH		 1653 * Execute an ORDERED command if no other older commands
1654 * exist that need to be completed first.
c66ac9db 1655 */
5f41a31d 1656 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1657 return false;
5f41a31d
CH		 1658 break;
1659 default:
c66ac9db
NB		 1660 /*
1661 * For SIMPLE and UNTAGGED Task Attribute commands
1662 */
5f41a31d 1663 atomic_inc(&dev->simple_cmds);
c66ac9db 1664 smp_mb__after_atomic_inc();
5f41a31d 1665 break;
c66ac9db 1666 }
5f41a31d 1667
019c4ca6
CH		 1668 if (atomic_read(&dev->dev_ordered_sync) == 0)
1669 return false;
c66ac9db 1670
019c4ca6
CH		 1671 spin_lock(&dev->delayed_cmd_lock);
1672 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1673 spin_unlock(&dev->delayed_cmd_lock);
1674
1675 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1676 " delayed CMD list, se_ordered_id: %u\n",
1677 cmd->t_task_cdb[0], cmd->sam_task_attr,
1678 cmd->se_ordered_id);
1679 return true;
1680}
1681
1682void target_execute_cmd(struct se_cmd *cmd)
1683{
1684 /*
1685 * If the received CDB has aleady been aborted stop processing it here.
1686 */
4a9a6c8d 1687 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1688 return;
c66ac9db 1689
019c4ca6
CH		 1690 /*
1691 * Determine if frontend context caller is requesting the stopping of
1692 * this command for frontend exceptions.
1693 */
4a9a6c8d 1694 spin_lock_irq(&cmd->t_state_lock);
019c4ca6
CH		 1695 if (cmd->transport_state & CMD_T_STOP) {
1696 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1697 __func__, __LINE__,
1698 cmd->se_tfo->get_task_tag(cmd));
1699
1700 spin_unlock_irq(&cmd->t_state_lock);
1701 complete(&cmd->t_transport_stop_comp);
1702 return;
1703 }
1704
1705 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1706 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6
CH		 1707 spin_unlock_irq(&cmd->t_state_lock);
1708
1a398b97
NB		 1709 if (target_handle_task_attr(cmd)) {
1710 spin_lock_irq(&cmd->t_state_lock);
1711 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1712 spin_unlock_irq(&cmd->t_state_lock);
1713 return;
1714 }
1715
1716 __target_execute_cmd(cmd);
c66ac9db 1717}
70baf0ab 1718EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1719
5f41a31d
CH		 1720/*
1721 * Process all commands up to the last received ORDERED task attribute which
1722 * requires another blocking boundary
1723 */
1724static void target_restart_delayed_cmds(struct se_device *dev)
1725{
1726 for (;;) {
1727 struct se_cmd *cmd;
1728
1729 spin_lock(&dev->delayed_cmd_lock);
1730 if (list_empty(&dev->delayed_cmd_list)) {
1731 spin_unlock(&dev->delayed_cmd_lock);
1732 break;
1733 }
1734
1735 cmd = list_entry(dev->delayed_cmd_list.next,
1736 struct se_cmd, se_delayed_node);
1737 list_del(&cmd->se_delayed_node);
1738 spin_unlock(&dev->delayed_cmd_lock);
1739
1740 __target_execute_cmd(cmd);
1741
1742 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1743 break;
1744 }
1745}
1746
c66ac9db 1747/*
35e0e757 1748 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1749 * and ordered cmds need to have their tasks added to the execution queue.
1750 */
1751static void transport_complete_task_attr(struct se_cmd *cmd)
1752{
5951146d 1753 struct se_device *dev = cmd->se_dev;
c66ac9db 1754
019c4ca6
CH		 1755 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1756 return;
1757
e66ecd50 1758 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1759 atomic_dec(&dev->simple_cmds);
1760 smp_mb__after_atomic_dec();
1761 dev->dev_cur_ordered_id++;
6708bb27 1762 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1763 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1764 cmd->se_ordered_id);
e66ecd50 1765 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1766 dev->dev_cur_ordered_id++;
6708bb27 1767 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1768 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1769 cmd->se_ordered_id);
e66ecd50 1770 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1771 atomic_dec(&dev->dev_ordered_sync);
1772 smp_mb__after_atomic_dec();
c66ac9db
NB		 1773
1774 dev->dev_cur_ordered_id++;
6708bb27 1775 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1776 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1777 }
c66ac9db 1778
5f41a31d 1779 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1780}
1781
e057f533 1782static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1783{
1784 int ret = 0;
1785
019c4ca6 1786 transport_complete_task_attr(cmd);
e057f533
CH		 1787
1788 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1789 trace_target_cmd_complete(cmd);
e057f533
CH		 1790 ret = cmd->se_tfo->queue_status(cmd);
1791 if (ret)
1792 goto out;
1793 }
07bde79a
NB		 1794
1795 switch (cmd->data_direction) {
1796 case DMA_FROM_DEVICE:
e5c0d6ad 1797 trace_target_cmd_complete(cmd);
07bde79a
NB		 1798 ret = cmd->se_tfo->queue_data_in(cmd);
1799 break;
1800 case DMA_TO_DEVICE:
64577407 1801 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a
NB		 1802 ret = cmd->se_tfo->queue_data_in(cmd);
1803 if (ret < 0)
e057f533 1804 break;
07bde79a
NB		 1805 }
1806 /* Fall through for DMA_TO_DEVICE */
1807 case DMA_NONE:
e5c0d6ad 1808 trace_target_cmd_complete(cmd);
07bde79a
NB		 1809 ret = cmd->se_tfo->queue_status(cmd);
1810 break;
1811 default:
1812 break;
1813 }
1814
e057f533
CH		 1815out:
1816 if (ret < 0) {
1817 transport_handle_queue_full(cmd, cmd->se_dev);
1818 return;
1819 }
1820 transport_lun_remove_cmd(cmd);
1821 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1822}
1823
1824static void transport_handle_queue_full(
1825 struct se_cmd *cmd,
e057f533 1826 struct se_device *dev)
07bde79a
NB		 1827{
1828 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1829 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1830 atomic_inc(&dev->dev_qf_count);
1831 smp_mb__after_atomic_inc();
1832 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1833
1834 schedule_work(&cmd->se_dev->qf_work_queue);
1835}
1836
35e0e757 1837static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1838{
35e0e757 1839 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1840 int ret;
35e0e757 1841
c66ac9db
NB		 1842 /*
1843 * Check if we need to move delayed/dormant tasks from cmds on the
1844 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1845 * Attribute.
1846 */
019c4ca6
CH		 1847 transport_complete_task_attr(cmd);
1848
07bde79a
NB		 1849 /*
1850 * Check to schedule QUEUE_FULL work, or execute an existing
1851 * cmd->transport_qf_callback()
1852 */
1853 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1854 schedule_work(&cmd->se_dev->qf_work_queue);
1855
c66ac9db 1856 /*
d5829eac 1857 * Check if we need to send a sense buffer from
c66ac9db
NB		 1858 * the struct se_cmd in question.
1859 */
1860 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1861 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1862 ret = transport_send_check_condition_and_sense(
1863 cmd, 0, 1);
1864 if (ret == -EAGAIN || ret == -ENOMEM)
1865 goto queue_full;
1866
1867 transport_lun_remove_cmd(cmd);
1868 transport_cmd_check_stop_to_fabric(cmd);
1869 return;
c66ac9db
NB		 1870 }
1871 /*
25985edc 1872 * Check for a callback, used by amongst other things
a6b0133c 1873 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 1874 */
a6b0133c
NB		 1875 if (cmd->transport_complete_callback) {
1876 sense_reason_t rc;
1877
1878 rc = cmd->transport_complete_callback(cmd);
a2890087 1879 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
a6b0133c 1880 return;
a2890087
NB		 1881 } else if (rc) {
1882 ret = transport_send_check_condition_and_sense(cmd,
1883 rc, 0);
1884 if (ret == -EAGAIN || ret == -ENOMEM)
1885 goto queue_full;
a6b0133c 1886
a2890087
NB		 1887 transport_lun_remove_cmd(cmd);
1888 transport_cmd_check_stop_to_fabric(cmd);
1889 return;
1890 }
a6b0133c 1891 }
c66ac9db
NB		 1892
1893 switch (cmd->data_direction) {
1894 case DMA_FROM_DEVICE:
1895 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1896 if (cmd->se_lun->lun_sep) {
1897 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1898 cmd->data_length;
1899 }
1900 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1901
e5c0d6ad 1902 trace_target_cmd_complete(cmd);
07bde79a 1903 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1904 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1905 goto queue_full;
c66ac9db
NB		 1906 break;
1907 case DMA_TO_DEVICE:
1908 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1909 if (cmd->se_lun->lun_sep) {
1910 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1911 cmd->data_length;
1912 }
1913 spin_unlock(&cmd->se_lun->lun_sep_lock);
1914 /*
1915 * Check if we need to send READ payload for BIDI-COMMAND
1916 */
64577407 1917 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 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.tx_data_octets +=
c66ac9db
NB		 1921 cmd->data_length;
1922 }
1923 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1924 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1925 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1926 goto queue_full;
c66ac9db
NB		 1927 break;
1928 }
1929 /* Fall through for DMA_TO_DEVICE */
1930 case DMA_NONE:
e5c0d6ad 1931 trace_target_cmd_complete(cmd);
07bde79a 1932 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1933 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1934 goto queue_full;
c66ac9db
NB		 1935 break;
1936 default:
1937 break;
1938 }
1939
1940 transport_lun_remove_cmd(cmd);
1941 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1942 return;
1943
1944queue_full:
6708bb27 1945 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1946 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1947 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1948 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1949}
1950
6708bb27 1951static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1952{
ec98f782 1953 struct scatterlist *sg;
ec98f782 1954 int count;
c66ac9db 1955
6708bb27
AG		 1956 for_each_sg(sgl, sg, nents, count)
1957 __free_page(sg_page(sg));
c66ac9db 1958
6708bb27
AG		 1959 kfree(sgl);
1960}
c66ac9db 1961
47e459e6
NB		 1962static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
1963{
1964 /*
1965 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
1966 * emulation, and free + reset pointers if necessary..
1967 */
1968 if (!cmd->t_data_sg_orig)
1969 return;
1970
1971 kfree(cmd->t_data_sg);
1972 cmd->t_data_sg = cmd->t_data_sg_orig;
1973 cmd->t_data_sg_orig = NULL;
1974 cmd->t_data_nents = cmd->t_data_nents_orig;
1975 cmd->t_data_nents_orig = 0;
1976}
1977
6708bb27
AG		 1978static inline void transport_free_pages(struct se_cmd *cmd)
1979{
47e459e6
NB		 1980 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
1981 transport_reset_sgl_orig(cmd);
6708bb27 1982 return;
47e459e6
NB		 1983 }
1984 transport_reset_sgl_orig(cmd);
6708bb27
AG		 1985
1986 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 1987 cmd->t_data_sg = NULL;
1988 cmd->t_data_nents = 0;
c66ac9db 1989
6708bb27 1990 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 1991 cmd->t_bidi_data_sg = NULL;
1992 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 1993}
1994
e26d99ae
CH		 1995/**
1996 * transport_release_cmd - free a command
1997 * @cmd: command to free
1998 *
1999 * This routine unconditionally frees a command, and reference counting
2000 * or list removal must be done in the caller.
2001 */
d5ddad41 2002static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2003{
2004 BUG_ON(!cmd->se_tfo);
2005
c8e31f26 2006 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2007 core_tmr_release_req(cmd->se_tmr_req);
2008 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2009 kfree(cmd->t_task_cdb);
2010 /*
7481deb4
NB		 2011 * If this cmd has been setup with target_get_sess_cmd(), drop
2012 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2013 */
ca24976a 2014 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2015}
2016
d3df7825
CH		 2017/**
2018 * transport_put_cmd - release a reference to a command
2019 * @cmd: command to release
2020 *
2021 * This routine releases our reference to the command and frees it if possible.
2022 */
d5ddad41 2023static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2024{
c66ac9db 2025 transport_free_pages(cmd);
d5ddad41 2026 return transport_release_cmd(cmd);
c66ac9db 2027}
c66ac9db 2028
4949314c 2029void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2030{
ec98f782 2031 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2032 struct page **pages;
2033 int i;
05d1c7c0
AG		 2034
2035 /*
ec98f782
AG		 2036 * We need to take into account a possible offset here for fabrics like
2037 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2038 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2039 */
4949314c
AG		 2040 if (!cmd->t_data_nents)
2041 return NULL;
3717ef0c
PB		 2042
2043 BUG_ON(!sg);
2044 if (cmd->t_data_nents == 1)
4949314c
AG		 2045 return kmap(sg_page(sg)) + sg->offset;
2046
2047 /* >1 page. use vmap */
2048 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2049 if (!pages)
4949314c
AG		 2050 return NULL;
2051
2052 /* convert sg[] to pages[] */
2053 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2054 pages[i] = sg_page(sg);
2055 }
2056
2057 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2058 kfree(pages);
de103c93 2059 if (!cmd->t_data_vmap)
4949314c
AG		 2060 return NULL;
2061
2062 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2063}
4949314c 2064EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2065
4949314c 2066void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2067{
a1edf9cf 2068 if (!cmd->t_data_nents) {
4949314c 2069 return;
a1edf9cf 2070 } else if (cmd->t_data_nents == 1) {
4949314c 2071 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2072 return;
2073 }
4949314c
AG		 2074
2075 vunmap(cmd->t_data_vmap);
2076 cmd->t_data_vmap = NULL;
05d1c7c0 2077}
4949314c 2078EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2079
c5ff8d6b 2080int
20093994
NB		 2081target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2082 bool zero_page)
c66ac9db 2083{
20093994 2084 struct scatterlist *sg;
ec98f782 2085 struct page *page;
20093994
NB		 2086 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2087 unsigned int nent;
ec98f782 2088 int i = 0;
c66ac9db 2089
20093994
NB		 2090 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2091 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2092 if (!sg)
ec98f782 2093 return -ENOMEM;
c66ac9db 2094
20093994 2095 sg_init_table(sg, nent);
9db9da33 2096
ec98f782
AG		 2097 while (length) {
2098 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2099 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2100 if (!page)
2101 goto out;
c66ac9db 2102
20093994 2103 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2104 length -= page_len;
2105 i++;
c66ac9db 2106 }
20093994
NB		 2107 *sgl = sg;
2108 *nents = nent;
c66ac9db 2109 return 0;
c66ac9db 2110
ec98f782 2111out:
d0e27c88 2112 while (i > 0) {
ec98f782 2113 i--;
20093994 2114 __free_page(sg_page(&sg[i]));
c66ac9db 2115 }
20093994 2116 kfree(sg);
ec98f782 2117 return -ENOMEM;
c66ac9db
NB		 2118}
2119
da0f7619 2120/*
b16a35b0
AG		 2121 * Allocate any required resources to execute the command. For writes we
2122 * might not have the payload yet, so notify the fabric via a call to
2123 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2124 */
de103c93
CH		 2125sense_reason_t
2126transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2127{
c66ac9db
NB		 2128 int ret = 0;
2129
2130 /*
2131 * Determine is the TCM fabric module has already allocated physical
2132 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2133 * beforehand.
c66ac9db 2134 */
ec98f782
AG		 2135 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2136 cmd->data_length) {
20093994
NB		 2137 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2138
8cefe07b
NB		 2139 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2140 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2141 u32 bidi_length;
2142
2143 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2144 bidi_length = cmd->t_task_nolb *
2145 cmd->se_dev->dev_attrib.block_size;
2146 else
2147 bidi_length = cmd->data_length;
2148
2149 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2150 &cmd->t_bidi_data_nents,
2151 bidi_length, zero_flag);
2152 if (ret < 0)
2153 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2154 }
2155
20093994
NB		 2156 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2157 cmd->data_length, zero_flag);
c66ac9db 2158 if (ret < 0)
de103c93 2159 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2160 }
c66ac9db 2161 /*
c3196f0c
CH		 2162 * If this command is not a write we can execute it right here,
2163 * for write buffers we need to notify the fabric driver first
2164 * and let it call back once the write buffers are ready.
c66ac9db 2165 */
5f41a31d 2166 target_add_to_state_list(cmd);
c3196f0c
CH		 2167 if (cmd->data_direction != DMA_TO_DEVICE) {
2168 target_execute_cmd(cmd);
2169 return 0;
2170 }
862e6389 2171 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2172
2173 ret = cmd->se_tfo->write_pending(cmd);
2174 if (ret == -EAGAIN || ret == -ENOMEM)
2175 goto queue_full;
2176
de103c93
CH		 2177 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2178 WARN_ON(ret);
2179
b69c1fcf 2180 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2181
c3196f0c
CH		 2182queue_full:
2183 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2184 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2185 transport_handle_queue_full(cmd, cmd->se_dev);
2186 return 0;
c66ac9db 2187}
a1d8b49a 2188EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2189
e057f533 2190static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2191{
f147abb4
NB		 2192 int ret;
2193
2194 ret = cmd->se_tfo->write_pending(cmd);
2195 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2196 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2197 cmd);
2198 transport_handle_queue_full(cmd, cmd->se_dev);
2199 }
07bde79a
NB		 2200}
2201
d5ddad41 2202int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2203{
c130480b 2204 unsigned long flags;
d5ddad41
NB		 2205 int ret = 0;
2206
d14921d6 2207 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2208 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2209 transport_wait_for_tasks(cmd);
2210
d5ddad41 2211 ret = transport_release_cmd(cmd);
d14921d6
NB		 2212 } else {
2213 if (wait_for_tasks)
2214 transport_wait_for_tasks(cmd);
c130480b
NB		 2215 /*
2216 * Handle WRITE failure case where transport_generic_new_cmd()
2217 * has already added se_cmd to state_list, but fabric has
2218 * failed command before I/O submission.
2219 */
2220 if (cmd->state_active) {
2221 spin_lock_irqsave(&cmd->t_state_lock, flags);
2222 target_remove_from_state_list(cmd);
2223 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2224 }
d14921d6 2225
82f1c8a4 2226 if (cmd->se_lun)
c66ac9db 2227 transport_lun_remove_cmd(cmd);
c66ac9db 2228
d5ddad41 2229 ret = transport_put_cmd(cmd);
c66ac9db 2230 }
d5ddad41 2231 return ret;
c66ac9db
NB		 2232}
2233EXPORT_SYMBOL(transport_generic_free_cmd);
2234
a17f091d
NB		 2235/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2236 * @se_sess: session to reference
2237 * @se_cmd: command descriptor to add
a6360785 2238 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2239 */
20361e69 2240int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2241 bool ack_kref)
a17f091d
NB		 2242{
2243 unsigned long flags;
bc187ea6 2244 int ret = 0;
a17f091d 2245
7481deb4 2246 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2247 /*
2248 * Add a second kref if the fabric caller is expecting to handle
2249 * fabric acknowledgement that requires two target_put_sess_cmd()
2250 * invocations before se_cmd descriptor release.
2251 */
86715569 2252 if (ack_kref == true) {
a6360785 2253 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2254 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2255 }
7481deb4 2256
a17f091d 2257 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2258 if (se_sess->sess_tearing_down) {
2259 ret = -ESHUTDOWN;
2260 goto out;
2261 }
a17f091d 2262 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2263out:
a17f091d 2264 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2265 return ret;
a17f091d 2266}
20361e69 2267EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2268
7481deb4 2269static void target_release_cmd_kref(struct kref *kref)
a17f091d 2270{
7481deb4
NB		 2271 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2272 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2273
a17f091d 2274 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2275 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2276 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2277 return;
a17f091d 2278 }
a17f091d 2279 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2280 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2281 complete(&se_cmd->cmd_wait_comp);
7481deb4 2282 return;
a17f091d
NB		 2283 }
2284 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2285 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2286
7481deb4
NB		 2287 se_cmd->se_tfo->release_cmd(se_cmd);
2288}
2289
2290/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2291 * @se_sess: session to reference
2292 * @se_cmd: command descriptor to drop
2293 */
2294int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2295{
ccf5ae83
JE		 2296 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2297 &se_sess->sess_cmd_lock);
a17f091d
NB		 2298}
2299EXPORT_SYMBOL(target_put_sess_cmd);
2300
1c7b13fe
RD		 2301/* target_sess_cmd_list_set_waiting - Flag all commands in
2302 * sess_cmd_list to complete cmd_wait_comp. Set
2303 * sess_tearing_down so no more commands are queued.
2304 * @se_sess: session to flag
a17f091d 2305 */
1c7b13fe 2306void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2307{
2308 struct se_cmd *se_cmd;
2309 unsigned long flags;
2310
a17f091d 2311 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2312 if (se_sess->sess_tearing_down) {
2313 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2314 return;
2315 }
1c7b13fe 2316 se_sess->sess_tearing_down = 1;
9b31a328 2317 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2318
9b31a328 2319 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2320 se_cmd->cmd_wait_set = 1;
2321
2322 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2323}
1c7b13fe 2324EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2325
2326/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2327 * @se_sess: session to wait for active I/O
a17f091d 2328 */
be646c2d 2329void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2330{
2331 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2332 unsigned long flags;
a17f091d
NB		 2333
2334 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2335 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2336 list_del(&se_cmd->se_cmd_list);
2337
2338 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2339 " %d\n", se_cmd, se_cmd->t_state,
2340 se_cmd->se_tfo->get_cmd_state(se_cmd));
2341
be646c2d
JE		 2342 wait_for_completion(&se_cmd->cmd_wait_comp);
2343 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2344 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2345 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2346
2347 se_cmd->se_tfo->release_cmd(se_cmd);
2348 }
9b31a328
NB		 2349
2350 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2351 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2352 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2353
a17f091d
NB		 2354}
2355EXPORT_SYMBOL(target_wait_for_sess_cmds);
2356
5277797d 2357static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2358{
8359cf43 2359 struct se_lun *lun = p;
c66ac9db 2360
5277797d
NB		 2361 percpu_ref_kill(&lun->lun_ref);
2362
2363 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2364 complete(&lun->lun_shutdown_comp);
2365
2366 return 0;
2367}
2368
5277797d 2369int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2370{
2371 struct task_struct *kt;
2372
5277797d 2373 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2374 "tcm_cl_%u", lun->unpacked_lun);
2375 if (IS_ERR(kt)) {
6708bb27 2376 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2377 return PTR_ERR(kt);
c66ac9db
NB		 2378 }
2379 wait_for_completion(&lun->lun_shutdown_comp);
2380
2381 return 0;
2382}
2383
d14921d6
NB		 2384/**
2385 * transport_wait_for_tasks - wait for completion to occur
2386 * @cmd: command to wait
c66ac9db 2387 *
d14921d6
NB		 2388 * Called from frontend fabric context to wait for storage engine
2389 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2390 */
a17f091d 2391bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2392{
2393 unsigned long flags;
2394
a1d8b49a 2395 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2396 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2397 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2398 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2399 return false;
d14921d6 2400 }
cb4f4d3c 2401
c8e31f26
AG		 2402 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2403 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2404 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2405 return false;
d14921d6 2406 }
7d680f3b 2407
3d28934a 2408 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2409 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2410 return false;
d14921d6 2411 }
c66ac9db 2412
7d680f3b 2413 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2414
6708bb27 2415 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2416 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2417 cmd, cmd->se_tfo->get_task_tag(cmd),
2418 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2419
a1d8b49a 2420 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2421
a1d8b49a 2422 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2423
a1d8b49a 2424 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2425 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2426
35d1efe8 2427 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2428 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2429 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2430
d14921d6 2431 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2432
2433 return true;
c66ac9db 2434}
d14921d6 2435EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2436
2437static int transport_get_sense_codes(
2438 struct se_cmd *cmd,
2439 u8 *asc,
2440 u8 *ascq)
2441{
2442 *asc = cmd->scsi_asc;
2443 *ascq = cmd->scsi_ascq;
2444
2445 return 0;
2446}
2447
de103c93
CH		 2448int
2449transport_send_check_condition_and_sense(struct se_cmd *cmd,
2450 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2451{
2452 unsigned char *buffer = cmd->sense_buffer;
2453 unsigned long flags;
c66ac9db
NB		 2454 u8 asc = 0, ascq = 0;
2455
a1d8b49a 2456 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2457 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2458 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2459 return 0;
2460 }
2461 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2462 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2463
2464 if (!reason && from_transport)
2465 goto after_reason;
2466
2467 if (!from_transport)
2468 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2469
c66ac9db
NB		 2470 /*
2471 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2472 * SENSE KEY values from include/scsi/scsi.h
2473 */
2474 switch (reason) {
ba829137
HR		 2475 case TCM_NO_SENSE:
2476 /* CURRENT ERROR */
2477 buffer[0] = 0x70;
2478 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2479 /* Not Ready */
2480 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2481 /* NO ADDITIONAL SENSE INFORMATION */
2482 buffer[SPC_ASC_KEY_OFFSET] = 0;
2483 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2484 break;
c66ac9db 2485 case TCM_NON_EXISTENT_LUN:
eb39d340 2486 /* CURRENT ERROR */
9c58b7dd
RD		 2487 buffer[0] = 0x70;
2488 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2489 /* ILLEGAL REQUEST */
9c58b7dd 2490 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2491 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2492 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2493 break;
c66ac9db
NB		 2494 case TCM_UNSUPPORTED_SCSI_OPCODE:
2495 case TCM_SECTOR_COUNT_TOO_MANY:
2496 /* CURRENT ERROR */
9c58b7dd
RD		 2497 buffer[0] = 0x70;
2498 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2499 /* ILLEGAL REQUEST */
9c58b7dd 2500 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2501 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2502 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2503 break;
2504 case TCM_UNKNOWN_MODE_PAGE:
2505 /* CURRENT ERROR */
9c58b7dd
RD		 2506 buffer[0] = 0x70;
2507 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2508 /* ILLEGAL REQUEST */
9c58b7dd 2509 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2510 /* INVALID FIELD IN CDB */
9c58b7dd 2511 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2512 break;
2513 case TCM_CHECK_CONDITION_ABORT_CMD:
2514 /* CURRENT ERROR */
9c58b7dd
RD		 2515 buffer[0] = 0x70;
2516 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2517 /* ABORTED COMMAND */
9c58b7dd 2518 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2519 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2520 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2521 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2522 break;
2523 case TCM_INCORRECT_AMOUNT_OF_DATA:
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 /* WRITE ERROR */
9c58b7dd 2530 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2531 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2532 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2533 break;
2534 case TCM_INVALID_CDB_FIELD:
2535 /* CURRENT ERROR */
9c58b7dd
RD		 2536 buffer[0] = 0x70;
2537 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2538 /* ILLEGAL REQUEST */
9c58b7dd 2539 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2540 /* INVALID FIELD IN CDB */
9c58b7dd 2541 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2542 break;
2543 case TCM_INVALID_PARAMETER_LIST:
2544 /* CURRENT ERROR */
9c58b7dd
RD		 2545 buffer[0] = 0x70;
2546 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2547 /* ILLEGAL REQUEST */
9c58b7dd 2548 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2549 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2550 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2551 break;
bb992e72
RD		 2552 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2553 /* CURRENT ERROR */
2554 buffer[0] = 0x70;
2555 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2556 /* ILLEGAL REQUEST */
2557 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2558 /* PARAMETER LIST LENGTH ERROR */
2559 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2560 break;
c66ac9db
NB		 2561 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2562 /* CURRENT ERROR */
9c58b7dd
RD		 2563 buffer[0] = 0x70;
2564 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2565 /* ABORTED COMMAND */
9c58b7dd 2566 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2567 /* WRITE ERROR */
9c58b7dd 2568 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2569 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2570 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2571 break;
2572 case TCM_SERVICE_CRC_ERROR:
2573 /* CURRENT ERROR */
9c58b7dd
RD		 2574 buffer[0] = 0x70;
2575 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2576 /* ABORTED COMMAND */
9c58b7dd 2577 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2578 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2579 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2580 /* N/A */
9c58b7dd 2581 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2582 break;
2583 case TCM_SNACK_REJECTED:
2584 /* CURRENT ERROR */
9c58b7dd
RD		 2585 buffer[0] = 0x70;
2586 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2587 /* ABORTED COMMAND */
9c58b7dd 2588 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2589 /* READ ERROR */
9c58b7dd 2590 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2591 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2592 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2593 break;
2594 case TCM_WRITE_PROTECTED:
2595 /* CURRENT ERROR */
9c58b7dd
RD		 2596 buffer[0] = 0x70;
2597 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2598 /* DATA PROTECT */
9c58b7dd 2599 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2600 /* WRITE PROTECTED */
9c58b7dd 2601 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2602 break;
e2397c70
RD		 2603 case TCM_ADDRESS_OUT_OF_RANGE:
2604 /* CURRENT ERROR */
9c58b7dd
RD		 2605 buffer[0] = 0x70;
2606 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2607 /* ILLEGAL REQUEST */
9c58b7dd 2608 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2609 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2610 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2611 break;
c66ac9db
NB		 2612 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2613 /* CURRENT ERROR */
9c58b7dd
RD		 2614 buffer[0] = 0x70;
2615 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2616 /* UNIT ATTENTION */
9c58b7dd 2617 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2618 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2619 buffer[SPC_ASC_KEY_OFFSET] = asc;
2620 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2621 break;
2622 case TCM_CHECK_CONDITION_NOT_READY:
2623 /* CURRENT ERROR */
9c58b7dd
RD		 2624 buffer[0] = 0x70;
2625 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2626 /* Not Ready */
9c58b7dd 2627 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2628 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2629 buffer[SPC_ASC_KEY_OFFSET] = asc;
2630 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2631 break;
818b571c
NB		 2632 case TCM_MISCOMPARE_VERIFY:
2633 /* CURRENT ERROR */
2634 buffer[0] = 0x70;
2635 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2636 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2637 /* MISCOMPARE DURING VERIFY OPERATION */
2638 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2639 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2640 break;
c66ac9db
NB		 2641 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2642 default:
2643 /* CURRENT ERROR */
9c58b7dd
RD		 2644 buffer[0] = 0x70;
2645 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2646 /*
2647 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2648 * Solaris initiators. Returning NOT READY instead means the
2649 * operations will be retried a finite number of times and we
2650 * can survive intermittent errors.
2651 */
2652 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2653 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2654 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2655 break;
2656 }
2657 /*
2658 * This code uses linux/include/scsi/scsi.h SAM status codes!
2659 */
2660 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2661 /*
2662 * Automatically padded, this value is encoded in the fabric's
2663 * data_length response PDU containing the SCSI defined sense data.
2664 */
9c58b7dd 2665 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2666
2667after_reason:
e5c0d6ad 2668 trace_target_cmd_complete(cmd);
07bde79a 2669 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2670}
2671EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2672
2673int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2674{
c18bc7d8
RD		 2675 if (!(cmd->transport_state & CMD_T_ABORTED))
2676 return 0;
c66ac9db 2677
c18bc7d8
RD		 2678 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2679 return 1;
8b1e1244 2680
c18bc7d8
RD		 2681 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2682 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2683
c18bc7d8 2684 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
29f4c090 2685 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2686 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2687 cmd->se_tfo->queue_status(cmd);
2688
2689 return 1;
c66ac9db
NB		 2690}
2691EXPORT_SYMBOL(transport_check_aborted_status);
2692
2693void transport_send_task_abort(struct se_cmd *cmd)
2694{
c252f003
NB		 2695 unsigned long flags;
2696
2697 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2698 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2699 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2700 return;
2701 }
2702 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2703
c66ac9db
NB		 2704 /*
2705 * If there are still expected incoming fabric WRITEs, we wait
2706 * until until they have completed before sending a TASK_ABORTED
2707 * response. This response with TASK_ABORTED status will be
2708 * queued back to fabric module by transport_check_aborted_status().
2709 */
2710 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2711 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2712 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2713 smp_mb__after_atomic_inc();
29f4c090 2714 return;
c66ac9db
NB		 2715 }
2716 }
2717 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2718
72b59d6e
RD		 2719 transport_lun_remove_cmd(cmd);
2720
6708bb27 2721 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2722 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2723 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2724
e5c0d6ad 2725 trace_target_cmd_complete(cmd);
e3d6f909 2726 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2727}
2728
af877292 2729static void target_tmr_work(struct work_struct *work)
c66ac9db 2730{
af877292 2731 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2732 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2733 struct se_tmr_req *tmr = cmd->se_tmr_req;
2734 int ret;
2735
2736 switch (tmr->function) {
5c6cd613 2737 case TMR_ABORT_TASK:
3d28934a 2738 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2739 break;
5c6cd613
NB		 2740 case TMR_ABORT_TASK_SET:
2741 case TMR_CLEAR_ACA:
2742 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2743 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2744 break;
5c6cd613 2745 case TMR_LUN_RESET:
c66ac9db
NB		 2746 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2747 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2748 TMR_FUNCTION_REJECTED;
2749 break;
5c6cd613 2750 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2751 tmr->response = TMR_FUNCTION_REJECTED;
2752 break;
5c6cd613 2753 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2754 tmr->response = TMR_FUNCTION_REJECTED;
2755 break;
c66ac9db 2756 default:
6708bb27 2757 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2758 tmr->function);
2759 tmr->response = TMR_FUNCTION_REJECTED;
2760 break;
2761 }
2762
2763 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2764 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2765
b7b8bef7 2766 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2767}
2768
af877292
CH		 2769int transport_generic_handle_tmr(
2770 struct se_cmd *cmd)
c66ac9db 2771{
af877292
CH		 2772 INIT_WORK(&cmd->work, target_tmr_work);
2773 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2774 return 0;
2775}
af877292 2776EXPORT_SYMBOL(transport_generic_handle_tmr);