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target/loop: Enable VARLEN CDB support
[deliverable/linux.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;
229d4f11
HR		 65struct kmem_cache *t10_alua_lba_map_cache;
66struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 67
c66ac9db 68static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 69static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 70 struct se_device *dev);
d5ddad41 71static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 72static void target_complete_ok_work(struct work_struct *work);
c66ac9db 73
e3d6f909 74int init_se_kmem_caches(void)
c66ac9db 75{
c66ac9db
NB		 76 se_sess_cache = kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session), __alignof__(struct se_session),
78 0, NULL);
6708bb27
AG		 79 if (!se_sess_cache) {
80 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 81 " failed\n");
c8e31f26 82 goto out;
c66ac9db
NB		 83 }
84 se_ua_cache = kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua), __alignof__(struct se_ua),
86 0, NULL);
6708bb27
AG		 87 if (!se_ua_cache) {
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 89 goto out_free_sess_cache;
c66ac9db 90 }
c66ac9db
NB		 91 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration),
93 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 94 if (!t10_pr_reg_cache) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 96 " failed\n");
35e0e757 97 goto out_free_ua_cache;
c66ac9db
NB		 98 }
99 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
101 0, NULL);
6708bb27
AG		 102 if (!t10_alua_lu_gp_cache) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 104 " failed\n");
35e0e757 105 goto out_free_pr_reg_cache;
c66ac9db
NB		 106 }
107 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member),
109 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 110 if (!t10_alua_lu_gp_mem_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 112 "cache failed\n");
35e0e757 113 goto out_free_lu_gp_cache;
c66ac9db
NB		 114 }
115 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp),
117 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 118 if (!t10_alua_tg_pt_gp_cache) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 120 "cache failed\n");
35e0e757 121 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 122 }
123 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member),
126 __alignof__(struct t10_alua_tg_pt_gp_member),
127 0, NULL);
6708bb27
AG		 128 if (!t10_alua_tg_pt_gp_mem_cache) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 130 "mem_t failed\n");
35e0e757 131 goto out_free_tg_pt_gp_cache;
c66ac9db 132 }
229d4f11
HR		 133 t10_alua_lba_map_cache = kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map),
136 __alignof__(struct t10_alua_lba_map), 0, NULL);
137 if (!t10_alua_lba_map_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
139 "cache failed\n");
140 goto out_free_tg_pt_gp_mem_cache;
141 }
142 t10_alua_lba_map_mem_cache = kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member),
145 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
146 if (!t10_alua_lba_map_mem_cache) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
148 "cache failed\n");
149 goto out_free_lba_map_cache;
150 }
c66ac9db 151
35e0e757
CH		 152 target_completion_wq = alloc_workqueue("target_completion",
153 WQ_MEM_RECLAIM, 0);
154 if (!target_completion_wq)
229d4f11 155 goto out_free_lba_map_mem_cache;
35e0e757 156
c66ac9db 157 return 0;
35e0e757 158
229d4f11
HR		 159out_free_lba_map_mem_cache:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
161out_free_lba_map_cache:
162 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 163out_free_tg_pt_gp_mem_cache:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
165out_free_tg_pt_gp_cache:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167out_free_lu_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169out_free_lu_gp_cache:
170 kmem_cache_destroy(t10_alua_lu_gp_cache);
171out_free_pr_reg_cache:
172 kmem_cache_destroy(t10_pr_reg_cache);
173out_free_ua_cache:
174 kmem_cache_destroy(se_ua_cache);
175out_free_sess_cache:
176 kmem_cache_destroy(se_sess_cache);
c66ac9db 177out:
e3d6f909 178 return -ENOMEM;
c66ac9db
NB		 179}
180
e3d6f909 181void release_se_kmem_caches(void)
c66ac9db 182{
35e0e757 183 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 184 kmem_cache_destroy(se_sess_cache);
185 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 186 kmem_cache_destroy(t10_pr_reg_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_cache);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
229d4f11
HR		 191 kmem_cache_destroy(t10_alua_lba_map_cache);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 193}
194
e3d6f909
AG		 195/* This code ensures unique mib indexes are handed out. */
196static DEFINE_SPINLOCK(scsi_mib_index_lock);
197static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 198
199/*
200 * Allocate a new row index for the entry type specified
201 */
202u32 scsi_get_new_index(scsi_index_t type)
203{
204 u32 new_index;
205
e3d6f909 206 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 207
e3d6f909
AG		 208 spin_lock(&scsi_mib_index_lock);
209 new_index = ++scsi_mib_index[type];
210 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 211
212 return new_index;
213}
214
dbc5623e 215void transport_subsystem_check_init(void)
c66ac9db
NB		 216{
217 int ret;
283669d2 218 static int sub_api_initialized;
c66ac9db 219
dbc5623e
NB		 220 if (sub_api_initialized)
221 return;
222
c66ac9db
NB		 223 ret = request_module("target_core_iblock");
224 if (ret != 0)
6708bb27 225 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 226
227 ret = request_module("target_core_file");
228 if (ret != 0)
6708bb27 229 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 230
231 ret = request_module("target_core_pscsi");
232 if (ret != 0)
6708bb27 233 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 234
7c9e7a6f
AG		 235 ret = request_module("target_core_user");
236 if (ret != 0)
237 pr_err("Unable to load target_core_user\n");
238
e3d6f909 239 sub_api_initialized = 1;
c66ac9db
NB		 240}
241
e70beee7 242struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 243{
244 struct se_session *se_sess;
245
246 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 247 if (!se_sess) {
248 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 249 " se_sess_cache\n");
250 return ERR_PTR(-ENOMEM);
251 }
252 INIT_LIST_HEAD(&se_sess->sess_list);
253 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 254 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 255 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 256 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 257 kref_init(&se_sess->sess_kref);
e70beee7 258 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 259
260 return se_sess;
261}
262EXPORT_SYMBOL(transport_init_session);
263
c0add7fd
NB		 264int transport_alloc_session_tags(struct se_session *se_sess,
265 unsigned int tag_num, unsigned int tag_size)
266{
267 int rc;
268
8c7f6e9b
NB		 269 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
270 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 271 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 272 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
273 if (!se_sess->sess_cmd_map) {
274 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
275 return -ENOMEM;
276 }
c0add7fd
NB		 277 }
278
279 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
280 if (rc < 0) {
281 pr_err("Unable to init se_sess->sess_tag_pool,"
282 " tag_num: %u\n", tag_num);
8c7f6e9b
NB		 283 if (is_vmalloc_addr(se_sess->sess_cmd_map))
284 vfree(se_sess->sess_cmd_map);
285 else
286 kfree(se_sess->sess_cmd_map);
c0add7fd
NB		 287 se_sess->sess_cmd_map = NULL;
288 return -ENOMEM;
289 }
290
291 return 0;
292}
293EXPORT_SYMBOL(transport_alloc_session_tags);
294
295struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 296 unsigned int tag_size,
297 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 298{
299 struct se_session *se_sess;
300 int rc;
301
e70beee7 302 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 303 if (IS_ERR(se_sess))
304 return se_sess;
305
306 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
307 if (rc < 0) {
308 transport_free_session(se_sess);
309 return ERR_PTR(-ENOMEM);
310 }
311
312 return se_sess;
313}
314EXPORT_SYMBOL(transport_init_session_tags);
315
c66ac9db 316/*
140854cb 317 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 318 */
319void __transport_register_session(
320 struct se_portal_group *se_tpg,
321 struct se_node_acl *se_nacl,
322 struct se_session *se_sess,
323 void *fabric_sess_ptr)
324{
9ac8928e 325 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 326 unsigned char buf[PR_REG_ISID_LEN];
327
328 se_sess->se_tpg = se_tpg;
329 se_sess->fabric_sess_ptr = fabric_sess_ptr;
330 /*
331 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
332 *
333 * Only set for struct se_session's that will actually be moving I/O.
334 * eg: *NOT* discovery sessions.
335 */
336 if (se_nacl) {
bffb5128
NB		 337 /*
338 *
339 * Determine if fabric allows for T10-PI feature bits exposed to
340 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
341 *
342 * If so, then always save prot_type on a per se_node_acl node
343 * basis and re-instate the previous sess_prot_type to avoid
344 * disabling PI from below any previously initiator side
345 * registered LUNs.
346 */
347 if (se_nacl->saved_prot_type)
348 se_sess->sess_prot_type = se_nacl->saved_prot_type;
349 else if (tfo->tpg_check_prot_fabric_only)
350 se_sess->sess_prot_type = se_nacl->saved_prot_type =
351 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 352 /*
353 * If the fabric module supports an ISID based TransportID,
354 * save this value in binary from the fabric I_T Nexus now.
355 */
e3d6f909 356 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 357 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 358 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 359 &buf[0], PR_REG_ISID_LEN);
360 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
361 }
afb999ff
NB		 362 kref_get(&se_nacl->acl_kref);
363
c66ac9db
NB		 364 spin_lock_irq(&se_nacl->nacl_sess_lock);
365 /*
366 * The se_nacl->nacl_sess pointer will be set to the
367 * last active I_T Nexus for each struct se_node_acl.
368 */
369 se_nacl->nacl_sess = se_sess;
370
371 list_add_tail(&se_sess->sess_acl_list,
372 &se_nacl->acl_sess_list);
373 spin_unlock_irq(&se_nacl->nacl_sess_lock);
374 }
375 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
376
6708bb27 377 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 378 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 379}
380EXPORT_SYMBOL(__transport_register_session);
381
382void transport_register_session(
383 struct se_portal_group *se_tpg,
384 struct se_node_acl *se_nacl,
385 struct se_session *se_sess,
386 void *fabric_sess_ptr)
387{
140854cb
NB		 388 unsigned long flags;
389
390 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 391 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 392 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 393}
394EXPORT_SYMBOL(transport_register_session);
395
ecf0dd66 396static void target_release_session(struct kref *kref)
41ac82b6
NB		 397{
398 struct se_session *se_sess = container_of(kref,
399 struct se_session, sess_kref);
400 struct se_portal_group *se_tpg = se_sess->se_tpg;
401
402 se_tpg->se_tpg_tfo->close_session(se_sess);
403}
404
405void target_get_session(struct se_session *se_sess)
406{
407 kref_get(&se_sess->sess_kref);
408}
409EXPORT_SYMBOL(target_get_session);
410
33933a0e 411void target_put_session(struct se_session *se_sess)
41ac82b6 412{
4149268e
JE		 413 struct se_portal_group *tpg = se_sess->se_tpg;
414
415 if (tpg->se_tpg_tfo->put_session != NULL) {
416 tpg->se_tpg_tfo->put_session(se_sess);
417 return;
418 }
33933a0e 419 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 420}
421EXPORT_SYMBOL(target_put_session);
422
f8e471f9
NB		 423ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
424{
425 struct se_session *se_sess;
426 ssize_t len = 0;
427
428 spin_lock_bh(&se_tpg->session_lock);
429 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
430 if (!se_sess->se_node_acl)
431 continue;
432 if (!se_sess->se_node_acl->dynamic_node_acl)
433 continue;
434 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
435 break;
436
437 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
438 se_sess->se_node_acl->initiatorname);
439 len += 1; /* Include NULL terminator */
440 }
441 spin_unlock_bh(&se_tpg->session_lock);
442
443 return len;
444}
445EXPORT_SYMBOL(target_show_dynamic_sessions);
446
afb999ff
NB		 447static void target_complete_nacl(struct kref *kref)
448{
449 struct se_node_acl *nacl = container_of(kref,
450 struct se_node_acl, acl_kref);
451
452 complete(&nacl->acl_free_comp);
453}
454
455void target_put_nacl(struct se_node_acl *nacl)
456{
457 kref_put(&nacl->acl_kref, target_complete_nacl);
458}
459
c66ac9db
NB		 460void transport_deregister_session_configfs(struct se_session *se_sess)
461{
462 struct se_node_acl *se_nacl;
23388864 463 unsigned long flags;
c66ac9db
NB		 464 /*
465 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
466 */
467 se_nacl = se_sess->se_node_acl;
6708bb27 468 if (se_nacl) {
23388864 469 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 470 if (se_nacl->acl_stop == 0)
471 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 472 /*
473 * If the session list is empty, then clear the pointer.
474 * Otherwise, set the struct se_session pointer from the tail
475 * element of the per struct se_node_acl active session list.
476 */
477 if (list_empty(&se_nacl->acl_sess_list))
478 se_nacl->nacl_sess = NULL;
479 else {
480 se_nacl->nacl_sess = container_of(
481 se_nacl->acl_sess_list.prev,
482 struct se_session, sess_acl_list);
483 }
23388864 484 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 485 }
486}
487EXPORT_SYMBOL(transport_deregister_session_configfs);
488
489void transport_free_session(struct se_session *se_sess)
490{
c0add7fd
NB		 491 if (se_sess->sess_cmd_map) {
492 percpu_ida_destroy(&se_sess->sess_tag_pool);
8c7f6e9b
NB		 493 if (is_vmalloc_addr(se_sess->sess_cmd_map))
494 vfree(se_sess->sess_cmd_map);
495 else
496 kfree(se_sess->sess_cmd_map);
c0add7fd 497 }
c66ac9db
NB		 498 kmem_cache_free(se_sess_cache, se_sess);
499}
500EXPORT_SYMBOL(transport_free_session);
501
502void transport_deregister_session(struct se_session *se_sess)
503{
504 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 505 const struct target_core_fabric_ops *se_tfo;
c66ac9db 506 struct se_node_acl *se_nacl;
e63a8e19 507 unsigned long flags;
01468346 508 bool comp_nacl = true;
c66ac9db 509
6708bb27 510 if (!se_tpg) {
c66ac9db
NB		 511 transport_free_session(se_sess);
512 return;
513 }
01468346 514 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 515
e63a8e19 516 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 517 list_del(&se_sess->sess_list);
518 se_sess->se_tpg = NULL;
519 se_sess->fabric_sess_ptr = NULL;
e63a8e19 520 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 521
522 /*
523 * Determine if we need to do extra work for this initiator node's
524 * struct se_node_acl if it had been previously dynamically generated.
525 */
526 se_nacl = se_sess->se_node_acl;
01468346
NB		 527
528 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
529 if (se_nacl && se_nacl->dynamic_node_acl) {
530 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
531 list_del(&se_nacl->acl_list);
532 se_tpg->num_node_acls--;
533 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
534 core_tpg_wait_for_nacl_pr_ref(se_nacl);
535 core_free_device_list_for_node(se_nacl, se_tpg);
536 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
537
538 comp_nacl = false;
539 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 540 }
c66ac9db 541 }
01468346 542 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 543
6708bb27 544 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 545 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 546 /*
125d0119 547 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 548 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
549 * removal context.
01468346 550 */
0bcc297e 551 if (se_nacl && comp_nacl)
afb999ff 552 target_put_nacl(se_nacl);
01468346 553
afb999ff 554 transport_free_session(se_sess);
c66ac9db
NB		 555}
556EXPORT_SYMBOL(transport_deregister_session);
557
558/*
a1d8b49a 559 * Called with cmd->t_state_lock held.
c66ac9db 560 */
cf572a96 561static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 562{
42bf829e 563 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 564 unsigned long flags;
565
42bf829e
CH		 566 if (!dev)
567 return;
c66ac9db 568
cf572a96
CH		 569 if (cmd->transport_state & CMD_T_BUSY)
570 return;
c66ac9db 571
cf572a96
CH		 572 spin_lock_irqsave(&dev->execute_task_lock, flags);
573 if (cmd->state_active) {
574 list_del(&cmd->state_list);
cf572a96 575 cmd->state_active = false;
c66ac9db 576 }
cf572a96 577 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 578}
579
862e6389
NB		 580static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
581 bool write_pending)
c66ac9db
NB		 582{
583 unsigned long flags;
584
a1d8b49a 585 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 586 if (write_pending)
587 cmd->t_state = TRANSPORT_WRITE_PENDING;
588
f7113a47
CH		 589 if (remove_from_lists) {
590 target_remove_from_state_list(cmd);
591
592 /*
593 * Clear struct se_cmd->se_lun before the handoff to FE.
594 */
595 cmd->se_lun = NULL;
596 }
597
c66ac9db
NB		 598 /*
599 * Determine if frontend context caller is requesting the stopping of
e3d6f909 600 * this command for frontend exceptions.
c66ac9db 601 */
7d680f3b
CH		 602 if (cmd->transport_state & CMD_T_STOP) {
603 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
604 __func__, __LINE__,
e3d6f909 605 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 606
a1d8b49a 607 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 608
a95d6511 609 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 610 return 1;
611 }
f7113a47
CH		 612
613 cmd->transport_state &= ~CMD_T_ACTIVE;
614 if (remove_from_lists) {
615 /*
616 * Some fabric modules like tcm_loop can release
617 * their internally allocated I/O reference now and
618 * struct se_cmd now.
619 *
620 * Fabric modules are expected to return '1' here if the
621 * se_cmd being passed is released at this point,
622 * or zero if not being released.
623 */
624 if (cmd->se_tfo->check_stop_free != NULL) {
625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
626 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 627 }
f7113a47 628 }
c66ac9db 629
a1d8b49a 630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 631 return 0;
632}
633
634static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
635{
862e6389 636 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 637}
638
639static void transport_lun_remove_cmd(struct se_cmd *cmd)
640{
e3d6f909 641 struct se_lun *lun = cmd->se_lun;
c66ac9db 642
5259a06e 643 if (!lun)
c66ac9db
NB		 644 return;
645
5259a06e
NB		 646 if (cmpxchg(&cmd->lun_ref_active, true, false))
647 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 648}
649
650void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
651{
68259b5a
AL		 652 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
653 transport_lun_remove_cmd(cmd);
131e6abc
NB		 654 /*
655 * Allow the fabric driver to unmap any resources before
656 * releasing the descriptor via TFO->release_cmd()
657 */
658 if (remove)
659 cmd->se_tfo->aborted_task(cmd);
68259b5a 660
c66ac9db
NB		 661 if (transport_cmd_check_stop_to_fabric(cmd))
662 return;
af877292 663 if (remove)
e6a2573f 664 transport_put_cmd(cmd);
c66ac9db
NB		 665}
666
35e0e757
CH		 667static void target_complete_failure_work(struct work_struct *work)
668{
669 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
670
de103c93
CH		 671 transport_generic_request_failure(cmd,
672 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 673}
674
6138ed2a 675/*
d5829eac
PB		 676 * Used when asking transport to copy Sense Data from the underlying
677 * Linux/SCSI struct scsi_cmnd
6138ed2a 678 */
d5829eac 679static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 680{
6138ed2a 681 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 682
683 WARN_ON(!cmd->se_lun);
684
685 if (!dev)
d5829eac 686 return NULL;
6138ed2a 687
d5829eac
PB		 688 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
689 return NULL;
6138ed2a 690
9c58b7dd 691 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 692
d5829eac 693 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 694 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 695 return cmd->sense_buffer;
6138ed2a
PB		 696}
697
5787cacd 698void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 699{
42bf829e 700 struct se_device *dev = cmd->se_dev;
5787cacd 701 int success = scsi_status == GOOD;
c66ac9db 702 unsigned long flags;
c66ac9db 703
5787cacd
CH		 704 cmd->scsi_status = scsi_status;
705
706
a1d8b49a 707 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 708 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 709
c66ac9db 710 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 711 dev->transport->transport_complete(cmd,
712 cmd->t_data_sg,
713 transport_get_sense_buffer(cmd));
714 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 715 success = 1;
c66ac9db
NB		 716 }
717
718 /*
5787cacd 719 * See if we are waiting to complete for an exception condition.
c66ac9db 720 */
cf572a96 721 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 722 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 723 complete(&cmd->task_stop_comp);
c66ac9db
NB		 724 return;
725 }
2235007c 726
3d28934a 727 /*
125d0119 728 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 729 * and transport_wait_for_tasks() will be waiting for completion..
730 */
731 if (cmd->transport_state & CMD_T_ABORTED &&
732 cmd->transport_state & CMD_T_STOP) {
733 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 734 complete_all(&cmd->t_transport_stop_comp);
3d28934a 735 return;
3dca1471 736 } else if (!success) {
35e0e757 737 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 738 } else {
35e0e757 739 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 740 }
35e0e757 741
35e0e757 742 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 743 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 744 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 745
35e0e757 746 queue_work(target_completion_wq, &cmd->work);
c66ac9db 747}
6bb35e00
CH		 748EXPORT_SYMBOL(target_complete_cmd);
749
2426bd45
RD		 750void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
751{
752 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
753 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
754 cmd->residual_count += cmd->data_length - length;
755 } else {
756 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
757 cmd->residual_count = cmd->data_length - length;
758 }
759
760 cmd->data_length = length;
761 }
762
763 target_complete_cmd(cmd, scsi_status);
764}
765EXPORT_SYMBOL(target_complete_cmd_with_length);
766
cf572a96 767static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 768{
cf572a96
CH		 769 struct se_device *dev = cmd->se_dev;
770 unsigned long flags;
c66ac9db 771
cf572a96
CH		 772 spin_lock_irqsave(&dev->execute_task_lock, flags);
773 if (!cmd->state_active) {
774 list_add_tail(&cmd->state_list, &dev->state_list);
775 cmd->state_active = true;
c66ac9db 776 }
cf572a96 777 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 778}
779
07bde79a 780/*
f147abb4 781 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 782 */
7a6f0a1e
CH		 783static void transport_write_pending_qf(struct se_cmd *cmd);
784static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 785
0fd97ccf 786void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 787{
788 struct se_device *dev = container_of(work, struct se_device,
789 qf_work_queue);
bcac364a 790 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 791 struct se_cmd *cmd, *cmd_tmp;
792
793 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 794 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
795 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 796
bcac364a 797 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 798 list_del(&cmd->se_qf_node);
33940d09 799 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 800
6708bb27 801 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 802 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 803 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 804 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
805 : "UNKNOWN");
f7a5cc0b 806
7a6f0a1e
CH		 807 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
808 transport_write_pending_qf(cmd);
809 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
810 transport_complete_qf(cmd);
07bde79a 811 }
07bde79a
NB		 812}
813
c66ac9db
NB		 814unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
815{
816 switch (cmd->data_direction) {
817 case DMA_NONE:
818 return "NONE";
819 case DMA_FROM_DEVICE:
820 return "READ";
821 case DMA_TO_DEVICE:
822 return "WRITE";
823 case DMA_BIDIRECTIONAL:
824 return "BIDI";
825 default:
826 break;
827 }
828
829 return "UNKNOWN";
830}
831
832void transport_dump_dev_state(
833 struct se_device *dev,
834 char *b,
835 int *bl)
836{
837 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 838 if (dev->export_count)
c66ac9db 839 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 840 else
c66ac9db 841 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 842
5f41a31d 843 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 844 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 845 dev->dev_attrib.block_size,
846 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 847 *bl += sprintf(b + *bl, " ");
848}
849
c66ac9db
NB		 850void transport_dump_vpd_proto_id(
851 struct t10_vpd *vpd,
852 unsigned char *p_buf,
853 int p_buf_len)
854{
855 unsigned char buf[VPD_TMP_BUF_SIZE];
856 int len;
857
858 memset(buf, 0, VPD_TMP_BUF_SIZE);
859 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
860
861 switch (vpd->protocol_identifier) {
862 case 0x00:
863 sprintf(buf+len, "Fibre Channel\n");
864 break;
865 case 0x10:
866 sprintf(buf+len, "Parallel SCSI\n");
867 break;
868 case 0x20:
869 sprintf(buf+len, "SSA\n");
870 break;
871 case 0x30:
872 sprintf(buf+len, "IEEE 1394\n");
873 break;
874 case 0x40:
875 sprintf(buf+len, "SCSI Remote Direct Memory Access"
876 " Protocol\n");
877 break;
878 case 0x50:
879 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
880 break;
881 case 0x60:
882 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
883 break;
884 case 0x70:
885 sprintf(buf+len, "Automation/Drive Interface Transport"
886 " Protocol\n");
887 break;
888 case 0x80:
889 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
890 break;
891 default:
892 sprintf(buf+len, "Unknown 0x%02x\n",
893 vpd->protocol_identifier);
894 break;
895 }
896
897 if (p_buf)
898 strncpy(p_buf, buf, p_buf_len);
899 else
6708bb27 900 pr_debug("%s", buf);
c66ac9db
NB		 901}
902
903void
904transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
905{
906 /*
907 * Check if the Protocol Identifier Valid (PIV) bit is set..
908 *
909 * from spc3r23.pdf section 7.5.1
910 */
911 if (page_83[1] & 0x80) {
912 vpd->protocol_identifier = (page_83[0] & 0xf0);
913 vpd->protocol_identifier_set = 1;
914 transport_dump_vpd_proto_id(vpd, NULL, 0);
915 }
916}
917EXPORT_SYMBOL(transport_set_vpd_proto_id);
918
919int transport_dump_vpd_assoc(
920 struct t10_vpd *vpd,
921 unsigned char *p_buf,
922 int p_buf_len)
923{
924 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 925 int ret = 0;
926 int len;
c66ac9db
NB		 927
928 memset(buf, 0, VPD_TMP_BUF_SIZE);
929 len = sprintf(buf, "T10 VPD Identifier Association: ");
930
931 switch (vpd->association) {
932 case 0x00:
933 sprintf(buf+len, "addressed logical unit\n");
934 break;
935 case 0x10:
936 sprintf(buf+len, "target port\n");
937 break;
938 case 0x20:
939 sprintf(buf+len, "SCSI target device\n");
940 break;
941 default:
942 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 943 ret = -EINVAL;
c66ac9db
NB		 944 break;
945 }
946
947 if (p_buf)
948 strncpy(p_buf, buf, p_buf_len);
949 else
6708bb27 950 pr_debug("%s", buf);
c66ac9db
NB		 951
952 return ret;
953}
954
955int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
956{
957 /*
958 * The VPD identification association..
959 *
960 * from spc3r23.pdf Section 7.6.3.1 Table 297
961 */
962 vpd->association = (page_83[1] & 0x30);
963 return transport_dump_vpd_assoc(vpd, NULL, 0);
964}
965EXPORT_SYMBOL(transport_set_vpd_assoc);
966
967int transport_dump_vpd_ident_type(
968 struct t10_vpd *vpd,
969 unsigned char *p_buf,
970 int p_buf_len)
971{
972 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 973 int ret = 0;
974 int len;
c66ac9db
NB		 975
976 memset(buf, 0, VPD_TMP_BUF_SIZE);
977 len = sprintf(buf, "T10 VPD Identifier Type: ");
978
979 switch (vpd->device_identifier_type) {
980 case 0x00:
981 sprintf(buf+len, "Vendor specific\n");
982 break;
983 case 0x01:
984 sprintf(buf+len, "T10 Vendor ID based\n");
985 break;
986 case 0x02:
987 sprintf(buf+len, "EUI-64 based\n");
988 break;
989 case 0x03:
990 sprintf(buf+len, "NAA\n");
991 break;
992 case 0x04:
993 sprintf(buf+len, "Relative target port identifier\n");
994 break;
995 case 0x08:
996 sprintf(buf+len, "SCSI name string\n");
997 break;
998 default:
999 sprintf(buf+len, "Unsupported: 0x%02x\n",
1000 vpd->device_identifier_type);
e3d6f909 1001 ret = -EINVAL;
c66ac9db
NB		 1002 break;
1003 }
1004
e3d6f909
AG		 1005 if (p_buf) {
1006 if (p_buf_len < strlen(buf)+1)
1007 return -EINVAL;
c66ac9db 1008 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1009 } else {
6708bb27 1010 pr_debug("%s", buf);
e3d6f909 1011 }
c66ac9db
NB		 1012
1013 return ret;
1014}
1015
1016int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1017{
1018 /*
1019 * The VPD identifier type..
1020 *
1021 * from spc3r23.pdf Section 7.6.3.1 Table 298
1022 */
1023 vpd->device_identifier_type = (page_83[1] & 0x0f);
1024 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1025}
1026EXPORT_SYMBOL(transport_set_vpd_ident_type);
1027
1028int transport_dump_vpd_ident(
1029 struct t10_vpd *vpd,
1030 unsigned char *p_buf,
1031 int p_buf_len)
1032{
1033 unsigned char buf[VPD_TMP_BUF_SIZE];
1034 int ret = 0;
1035
1036 memset(buf, 0, VPD_TMP_BUF_SIZE);
1037
1038 switch (vpd->device_identifier_code_set) {
1039 case 0x01: /* Binary */
703d641d
DC		 1040 snprintf(buf, sizeof(buf),
1041 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1042 &vpd->device_identifier[0]);
1043 break;
1044 case 0x02: /* ASCII */
703d641d
DC		 1045 snprintf(buf, sizeof(buf),
1046 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1047 &vpd->device_identifier[0]);
1048 break;
1049 case 0x03: /* UTF-8 */
703d641d
DC		 1050 snprintf(buf, sizeof(buf),
1051 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1052 &vpd->device_identifier[0]);
1053 break;
1054 default:
1055 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1056 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1057 ret = -EINVAL;
c66ac9db
NB		 1058 break;
1059 }
1060
1061 if (p_buf)
1062 strncpy(p_buf, buf, p_buf_len);
1063 else
6708bb27 1064 pr_debug("%s", buf);
c66ac9db
NB		 1065
1066 return ret;
1067}
1068
1069int
1070transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1071{
1072 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1073 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1074
1075 /*
1076 * The VPD Code Set (encoding)
1077 *
1078 * from spc3r23.pdf Section 7.6.3.1 Table 296
1079 */
1080 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1081 switch (vpd->device_identifier_code_set) {
1082 case 0x01: /* Binary */
1083 vpd->device_identifier[j++] =
1084 hex_str[vpd->device_identifier_type];
1085 while (i < (4 + page_83[3])) {
1086 vpd->device_identifier[j++] =
1087 hex_str[(page_83[i] & 0xf0) >> 4];
1088 vpd->device_identifier[j++] =
1089 hex_str[page_83[i] & 0x0f];
1090 i++;
1091 }
1092 break;
1093 case 0x02: /* ASCII */
1094 case 0x03: /* UTF-8 */
1095 while (i < (4 + page_83[3]))
1096 vpd->device_identifier[j++] = page_83[i++];
1097 break;
1098 default:
1099 break;
1100 }
1101
1102 return transport_dump_vpd_ident(vpd, NULL, 0);
1103}
1104EXPORT_SYMBOL(transport_set_vpd_ident);
1105
de103c93
CH		 1106sense_reason_t
1107target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1108{
1109 struct se_device *dev = cmd->se_dev;
1110
1111 if (cmd->unknown_data_length) {
1112 cmd->data_length = size;
1113 } else if (size != cmd->data_length) {
1114 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1115 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1116 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1117 cmd->data_length, size, cmd->t_task_cdb[0]);
1118
9b3b8041
CH		 1119 if (cmd->data_direction == DMA_TO_DEVICE) {
1120 pr_err("Rejecting underflow/overflow"
1121 " WRITE data\n");
de103c93 1122 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1123 }
1124 /*
1125 * Reject READ_* or WRITE_* with overflow/underflow for
1126 * type SCF_SCSI_DATA_CDB.
1127 */
0fd97ccf 1128 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1129 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1130 " CDB on non 512-byte sector setup subsystem"
1131 " plugin: %s\n", dev->transport->name);
1132 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1133 return TCM_INVALID_CDB_FIELD;
9b3b8041 1134 }
4c054ba6
NB		 1135 /*
1136 * For the overflow case keep the existing fabric provided
1137 * ->data_length. Otherwise for the underflow case, reset
1138 * ->data_length to the smaller SCSI expected data transfer
1139 * length.
1140 */
9b3b8041
CH		 1141 if (size > cmd->data_length) {
1142 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1143 cmd->residual_count = (size - cmd->data_length);
1144 } else {
1145 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1146 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1147 cmd->data_length = size;
9b3b8041 1148 }
9b3b8041
CH		 1149 }
1150
1151 return 0;
1152
9b3b8041
CH		 1153}
1154
c66ac9db
NB		 1155/*
1156 * Used by fabric modules containing a local struct se_cmd within their
1157 * fabric dependent per I/O descriptor.
1158 */
1159void transport_init_se_cmd(
1160 struct se_cmd *cmd,
9ac8928e 1161 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1162 struct se_session *se_sess,
1163 u32 data_length,
1164 int data_direction,
1165 int task_attr,
1166 unsigned char *sense_buffer)
1167{
5951146d 1168 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1169 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1170 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1171 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1172 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1173 init_completion(&cmd->cmd_wait_comp);
cf572a96 1174 init_completion(&cmd->task_stop_comp);
a1d8b49a 1175 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1176 kref_init(&cmd->cmd_kref);
7d680f3b 1177 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1178
1179 cmd->se_tfo = tfo;
1180 cmd->se_sess = se_sess;
1181 cmd->data_length = data_length;
1182 cmd->data_direction = data_direction;
1183 cmd->sam_task_attr = task_attr;
1184 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1185
1186 cmd->state_active = false;
c66ac9db
NB		 1187}
1188EXPORT_SYMBOL(transport_init_se_cmd);
1189
de103c93
CH		 1190static sense_reason_t
1191transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1192{
019c4ca6
CH		 1193 struct se_device *dev = cmd->se_dev;
1194
c66ac9db
NB		 1195 /*
1196 * Check if SAM Task Attribute emulation is enabled for this
1197 * struct se_device storage object
1198 */
a3541703 1199 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1200 return 0;
1201
68d81f40 1202 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1203 pr_debug("SAM Task Attribute ACA"
c66ac9db 1204 " emulation is not supported\n");
de103c93 1205 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1206 }
1207 /*
1208 * Used to determine when ORDERED commands should go from
1209 * Dormant to Active status.
1210 */
019c4ca6 1211 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
6708bb27 1212 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1213 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1214 dev->transport->name);
c66ac9db
NB		 1215 return 0;
1216}
1217
de103c93
CH		 1218sense_reason_t
1219target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1220{
0fd97ccf 1221 struct se_device *dev = cmd->se_dev;
de103c93 1222 sense_reason_t ret;
c66ac9db 1223
c66ac9db
NB		 1224 /*
1225 * Ensure that the received CDB is less than the max (252 + 8) bytes
1226 * for VARIABLE_LENGTH_CMD
1227 */
1228 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1229 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1230 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1231 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1232 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1233 }
1234 /*
1235 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1236 * allocate the additional extended CDB buffer now.. Otherwise
1237 * setup the pointer from __t_task_cdb to t_task_cdb.
1238 */
a1d8b49a
AG		 1239 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1240 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1241 GFP_KERNEL);
6708bb27
AG		 1242 if (!cmd->t_task_cdb) {
1243 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1244 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1245 scsi_command_size(cdb),
a1d8b49a 1246 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1247 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1248 }
1249 } else
a1d8b49a 1250 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1251 /*
a1d8b49a 1252 * Copy the original CDB into cmd->
c66ac9db 1253 */
a1d8b49a 1254 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1255
e5c0d6ad
RD		 1256 trace_target_sequencer_start(cmd);
1257
cb4f4d3c
CH		 1258 /*
1259 * Check for an existing UNIT ATTENTION condition
1260 */
de103c93
CH		 1261 ret = target_scsi3_ua_check(cmd);
1262 if (ret)
1263 return ret;
cb4f4d3c 1264
c87fbd56 1265 ret = target_alua_state_check(cmd);
de103c93
CH		 1266 if (ret)
1267 return ret;
cb4f4d3c 1268
d977f437 1269 ret = target_check_reservation(cmd);
f85eda8d
NB		 1270 if (ret) {
1271 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1272 return ret;
f85eda8d 1273 }
cb4f4d3c 1274
0fd97ccf 1275 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1276 if (ret)
1277 return ret;
1278
1279 ret = transport_check_alloc_task_attr(cmd);
1280 if (ret)
c66ac9db 1281 return ret;
cb4f4d3c 1282
cb4f4d3c 1283 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1284
c66ac9db
NB		 1285 spin_lock(&cmd->se_lun->lun_sep_lock);
1286 if (cmd->se_lun->lun_sep)
1287 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1288 spin_unlock(&cmd->se_lun->lun_sep_lock);
1289 return 0;
1290}
a12f41f8 1291EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1292
695434e1
NB		 1293/*
1294 * Used by fabric module frontends to queue tasks directly.
1295 * Many only be used from process context only
1296 */
1297int transport_handle_cdb_direct(
1298 struct se_cmd *cmd)
1299{
de103c93 1300 sense_reason_t ret;
dd8ae59d 1301
695434e1
NB		 1302 if (!cmd->se_lun) {
1303 dump_stack();
6708bb27 1304 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1305 return -EINVAL;
1306 }
1307 if (in_interrupt()) {
1308 dump_stack();
6708bb27 1309 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1310 " from interrupt context\n");
1311 return -EINVAL;
1312 }
dd8ae59d 1313 /*
af877292
CH		 1314 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1315 * outstanding descriptors are handled correctly during shutdown via
1316 * transport_wait_for_tasks()
dd8ae59d
NB		 1317 *
1318 * Also, we don't take cmd->t_state_lock here as we only expect
1319 * this to be called for initial descriptor submission.
1320 */
1321 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1322 cmd->transport_state |= CMD_T_ACTIVE;
1323
dd8ae59d
NB		 1324 /*
1325 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1326 * so follow TRANSPORT_NEW_CMD processing thread context usage
1327 * and call transport_generic_request_failure() if necessary..
1328 */
1329 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1330 if (ret)
1331 transport_generic_request_failure(cmd, ret);
dd8ae59d 1332 return 0;
695434e1
NB		 1333}
1334EXPORT_SYMBOL(transport_handle_cdb_direct);
1335
c5ff8d6b 1336sense_reason_t
de103c93
CH		 1337transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1338 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1339{
1340 if (!sgl || !sgl_count)
1341 return 0;
1342
1343 /*
1344 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1345 * scatterlists already have been set to follow what the fabric
1346 * passes for the original expected data transfer length.
1347 */
1348 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1349 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1350 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1351 return TCM_INVALID_CDB_FIELD;
1352 }
1353
1354 cmd->t_data_sg = sgl;
1355 cmd->t_data_nents = sgl_count;
1356
1357 if (sgl_bidi && sgl_bidi_count) {
1358 cmd->t_bidi_data_sg = sgl_bidi;
1359 cmd->t_bidi_data_nents = sgl_bidi_count;
1360 }
1361 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1362 return 0;
1363}
1364
a026757f
NB		 1365/*
1366 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1367 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1368 *
1369 * @se_cmd: command descriptor to submit
1370 * @se_sess: associated se_sess for endpoint
1371 * @cdb: pointer to SCSI CDB
1372 * @sense: pointer to SCSI sense buffer
1373 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1374 * @data_length: fabric expected data transfer length
1375 * @task_addr: SAM task attribute
1376 * @data_dir: DMA data direction
1377 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1378 * @sgl: struct scatterlist memory for unidirectional mapping
1379 * @sgl_count: scatterlist count for unidirectional mapping
1380 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1381 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1382 * @sgl_prot: struct scatterlist memory protection information
1383 * @sgl_prot_count: scatterlist count for protection information
a6360785 1384 *
d6dfc868
RD		 1385 * Returns non zero to signal active I/O shutdown failure. All other
1386 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1387 * but still return zero here.
1388 *
a6360785
NB		 1389 * This may only be called from process context, and also currently
1390 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1391 */
1392int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1393 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1394 u32 data_length, int task_attr, int data_dir, int flags,
1395 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1396 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1397 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1398{
1399 struct se_portal_group *se_tpg;
de103c93
CH		 1400 sense_reason_t rc;
1401 int ret;
a6360785
NB		 1402
1403 se_tpg = se_sess->se_tpg;
1404 BUG_ON(!se_tpg);
1405 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1406 BUG_ON(in_interrupt());
1407 /*
1408 * Initialize se_cmd for target operation. From this point
1409 * exceptions are handled by sending exception status via
1410 * target_core_fabric_ops->queue_status() callback
1411 */
1412 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1413 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1414 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1415 se_cmd->unknown_data_length = 1;
a6360785
NB		 1416 /*
1417 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1418 * se_sess->sess_cmd_list. A second kref_get here is necessary
1419 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1420 * kref_put() to happen during fabric packet acknowledgement.
1421 */
de103c93
CH		 1422 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1423 if (ret)
1424 return ret;
a6360785
NB		 1425 /*
1426 * Signal bidirectional data payloads to target-core
1427 */
1428 if (flags & TARGET_SCF_BIDI_OP)
1429 se_cmd->se_cmd_flags |= SCF_BIDI;
1430 /*
1431 * Locate se_lun pointer and attach it to struct se_cmd
1432 */
de103c93
CH		 1433 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1434 if (rc) {
1435 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1436 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1437 return 0;
735703ca 1438 }
b5b8e298
SG		 1439
1440 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1441 if (rc != 0) {
1442 transport_generic_request_failure(se_cmd, rc);
1443 return 0;
1444 }
1445
def2b339
NB		 1446 /*
1447 * Save pointers for SGLs containing protection information,
1448 * if present.
1449 */
1450 if (sgl_prot_count) {
1451 se_cmd->t_prot_sg = sgl_prot;
1452 se_cmd->t_prot_nents = sgl_prot_count;
1453 }
d6e0175c 1454
a026757f
NB		 1455 /*
1456 * When a non zero sgl_count has been passed perform SGL passthrough
1457 * mapping for pre-allocated fabric memory instead of having target
1458 * core perform an internal SGL allocation..
1459 */
1460 if (sgl_count != 0) {
1461 BUG_ON(!sgl);
1462
944981c7
NB		 1463 /*
1464 * A work-around for tcm_loop as some userspace code via
1465 * scsi-generic do not memset their associated read buffers,
1466 * so go ahead and do that here for type non-data CDBs. Also
1467 * note that this is currently guaranteed to be a single SGL
1468 * for this case by target core in target_setup_cmd_from_cdb()
1469 * -> transport_generic_cmd_sequencer().
1470 */
1471 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1472 se_cmd->data_direction == DMA_FROM_DEVICE) {
1473 unsigned char *buf = NULL;
1474
1475 if (sgl)
1476 buf = kmap(sg_page(sgl)) + sgl->offset;
1477
1478 if (buf) {
1479 memset(buf, 0, sgl->length);
1480 kunmap(sg_page(sgl));
1481 }
1482 }
1483
a026757f
NB		 1484 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1485 sgl_bidi, sgl_bidi_count);
1486 if (rc != 0) {
de103c93 1487 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1488 return 0;
1489 }
1490 }
def2b339 1491
11e319ed
AG		 1492 /*
1493 * Check if we need to delay processing because of ALUA
1494 * Active/NonOptimized primary access state..
1495 */
1496 core_alua_check_nonop_delay(se_cmd);
1497
a6360785 1498 transport_handle_cdb_direct(se_cmd);
d6dfc868 1499 return 0;
a6360785 1500}
a026757f
NB		 1501EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1502
1503/*
1504 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1505 *
1506 * @se_cmd: command descriptor to submit
1507 * @se_sess: associated se_sess for endpoint
1508 * @cdb: pointer to SCSI CDB
1509 * @sense: pointer to SCSI sense buffer
1510 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1511 * @data_length: fabric expected data transfer length
1512 * @task_addr: SAM task attribute
1513 * @data_dir: DMA data direction
1514 * @flags: flags for command submission from target_sc_flags_tables
1515 *
1516 * Returns non zero to signal active I/O shutdown failure. All other
1517 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1518 * but still return zero here.
1519 *
1520 * This may only be called from process context, and also currently
1521 * assumes internal allocation of fabric payload buffer by target-core.
1522 *
1523 * It also assumes interal target core SGL memory allocation.
1524 */
1525int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1526 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1527 u32 data_length, int task_attr, int data_dir, int flags)
1528{
1529 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1530 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1531 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1532}
a6360785
NB		 1533EXPORT_SYMBOL(target_submit_cmd);
1534
9f0d05c2
NB		 1535static void target_complete_tmr_failure(struct work_struct *work)
1536{
1537 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1538
1539 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1540 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1541
1542 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1543}
1544
ea98d7f9
AG		 1545/**
1546 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1547 * for TMR CDBs
1548 *
1549 * @se_cmd: command descriptor to submit
1550 * @se_sess: associated se_sess for endpoint
1551 * @sense: pointer to SCSI sense buffer
1552 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1553 * @fabric_context: fabric context for TMR req
1554 * @tm_type: Type of TM request
c0974f89
NB		 1555 * @gfp: gfp type for caller
1556 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1557 * @flags: submit cmd flags
ea98d7f9
AG		 1558 *
1559 * Callable from all contexts.
1560 **/
1561
c7042cae 1562int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1563 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1564 void *fabric_tmr_ptr, unsigned char tm_type,
1565 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1566{
1567 struct se_portal_group *se_tpg;
1568 int ret;
1569
1570 se_tpg = se_sess->se_tpg;
1571 BUG_ON(!se_tpg);
1572
1573 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1574 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1575 /*
1576 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1577 * allocation failure.
1578 */
c0974f89 1579 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1580 if (ret < 0)
1581 return -ENOMEM;
ea98d7f9 1582
c0974f89
NB		 1583 if (tm_type == TMR_ABORT_TASK)
1584 se_cmd->se_tmr_req->ref_task_tag = tag;
1585
ea98d7f9 1586 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1587 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1588 if (ret) {
1589 core_tmr_release_req(se_cmd->se_tmr_req);
1590 return ret;
1591 }
ea98d7f9 1592
ea98d7f9
AG		 1593 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1594 if (ret) {
9f0d05c2
NB		 1595 /*
1596 * For callback during failure handling, push this work off
1597 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1598 */
1599 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1600 schedule_work(&se_cmd->work);
c7042cae 1601 return 0;
ea98d7f9
AG		 1602 }
1603 transport_generic_handle_tmr(se_cmd);
c7042cae 1604 return 0;
ea98d7f9
AG		 1605}
1606EXPORT_SYMBOL(target_submit_tmr);
1607
cdbb70bb 1608/*
cf572a96 1609 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1610 * has completed.
1611 */
cf572a96 1612bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cb0df4d3
BVA		 1613 __releases(&cmd->t_state_lock)
1614 __acquires(&cmd->t_state_lock)
cdbb70bb 1615{
cdbb70bb
CH		 1616 bool was_active = false;
1617
cf572a96
CH		 1618 if (cmd->transport_state & CMD_T_BUSY) {
1619 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1620 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1621
cf572a96
CH		 1622 pr_debug("cmd %p waiting to complete\n", cmd);
1623 wait_for_completion(&cmd->task_stop_comp);
1624 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1625
1626 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1627 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1628 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1629 was_active = true;
1630 }
1631
cdbb70bb
CH		 1632 return was_active;
1633}
1634
c66ac9db
NB		 1635/*
1636 * Handle SAM-esque emulation for generic transport request failures.
1637 */
de103c93
CH		 1638void transport_generic_request_failure(struct se_cmd *cmd,
1639 sense_reason_t sense_reason)
c66ac9db 1640{
07bde79a
NB		 1641 int ret = 0;
1642
6708bb27 1643 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1644 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1645 cmd->t_task_cdb[0]);
de103c93 1646 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1647 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1648 cmd->t_state, sense_reason);
d43d6aea 1649 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1650 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1651 (cmd->transport_state & CMD_T_STOP) != 0,
1652 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1653
c66ac9db
NB		 1654 /*
1655 * For SAM Task Attribute emulation for failed struct se_cmd
1656 */
019c4ca6 1657 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1658 /*
1659 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1660 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1661 */
1662 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1663 cmd->transport_complete_callback)
c8e63985 1664 cmd->transport_complete_callback(cmd, false);
c66ac9db 1665
de103c93 1666 switch (sense_reason) {
03e98c9e
NB		 1667 case TCM_NON_EXISTENT_LUN:
1668 case TCM_UNSUPPORTED_SCSI_OPCODE:
1669 case TCM_INVALID_CDB_FIELD:
1670 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1671 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1672 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1673 case TCM_UNKNOWN_MODE_PAGE:
1674 case TCM_WRITE_PROTECTED:
e2397c70 1675 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1676 case TCM_CHECK_CONDITION_ABORT_CMD:
1677 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1678 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1679 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1680 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1681 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1682 break;
de103c93
CH		 1683 case TCM_OUT_OF_RESOURCES:
1684 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1685 break;
03e98c9e 1686 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1687 /*
1688 * No SENSE Data payload for this case, set SCSI Status
1689 * and queue the response to $FABRIC_MOD.
1690 *
1691 * Uses linux/include/scsi/scsi.h SAM status codes defs
1692 */
1693 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1694 /*
1695 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1696 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1697 * CONFLICT STATUS.
1698 *
1699 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1700 */
e3d6f909 1701 if (cmd->se_sess &&
0fd97ccf 1702 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1703 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1704 cmd->orig_fe_lun, 0x2C,
1705 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1706
e5c0d6ad
RD		 1707 trace_target_cmd_complete(cmd);
1708 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1709 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1710 goto queue_full;
c66ac9db 1711 goto check_stop;
c66ac9db 1712 default:
6708bb27 1713 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1714 cmd->t_task_cdb[0], sense_reason);
1715 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1716 break;
1717 }
f3146437 1718
de103c93 1719 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1720 if (ret == -EAGAIN || ret == -ENOMEM)
1721 goto queue_full;
07bde79a 1722
c66ac9db
NB		 1723check_stop:
1724 transport_lun_remove_cmd(cmd);
6708bb27 1725 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1726 ;
07bde79a
NB		 1727 return;
1728
1729queue_full:
e057f533
CH		 1730 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1731 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1732}
2fbff127 1733EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1734
76dde50e 1735void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1736{
de103c93 1737 sense_reason_t ret;
5f41a31d 1738
de103c93
CH		 1739 if (cmd->execute_cmd) {
1740 ret = cmd->execute_cmd(cmd);
1741 if (ret) {
1742 spin_lock_irq(&cmd->t_state_lock);
1743 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1744 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1745
de103c93
CH		 1746 transport_generic_request_failure(cmd, ret);
1747 }
5f41a31d
CH		 1748 }
1749}
1750
aa58b531
NB		 1751static int target_write_prot_action(struct se_cmd *cmd)
1752{
5132d1e6 1753 u32 sectors;
aa58b531
NB		 1754 /*
1755 * Perform WRITE_INSERT of PI using software emulation when backend
1756 * device has PI enabled, if the transport has not already generated
1757 * PI using hardware WRITE_INSERT offload.
1758 */
1759 switch (cmd->prot_op) {
1760 case TARGET_PROT_DOUT_INSERT:
1761 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1762 sbc_dif_generate(cmd);
1763 break;
5132d1e6
NB		 1764 case TARGET_PROT_DOUT_STRIP:
1765 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1766 break;
1767
1768 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1769 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1770 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1771 if (unlikely(cmd->pi_err)) {
1772 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1773 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1774 spin_unlock_irq(&cmd->t_state_lock);
1775 transport_generic_request_failure(cmd, cmd->pi_err);
1776 return -1;
1777 }
1778 break;
aa58b531
NB		 1779 default:
1780 break;
1781 }
1782
1783 return 0;
1784}
1785
019c4ca6 1786static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1787{
1788 struct se_device *dev = cmd->se_dev;
1789
a3541703 1790 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1791 return false;
5f41a31d 1792
c66ac9db 1793 /*
25985edc 1794 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1795 * to allow the passed struct se_cmd list of tasks to the front of the list.
1796 */
5f41a31d 1797 switch (cmd->sam_task_attr) {
68d81f40 1798 case TCM_HEAD_TAG:
5f41a31d
CH		 1799 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1800 "se_ordered_id: %u\n",
1801 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1802 return false;
68d81f40 1803 case TCM_ORDERED_TAG:
33940d09 1804 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1805
5f41a31d
CH		 1806 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1807 " se_ordered_id: %u\n",
1808 cmd->t_task_cdb[0], cmd->se_ordered_id);
1809
c66ac9db 1810 /*
5f41a31d
CH		 1811 * Execute an ORDERED command if no other older commands
1812 * exist that need to be completed first.
c66ac9db 1813 */
5f41a31d 1814 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1815 return false;
5f41a31d
CH		 1816 break;
1817 default:
c66ac9db
NB		 1818 /*
1819 * For SIMPLE and UNTAGGED Task Attribute commands
1820 */
33940d09 1821 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1822 break;
c66ac9db 1823 }
5f41a31d 1824
019c4ca6
CH		 1825 if (atomic_read(&dev->dev_ordered_sync) == 0)
1826 return false;
c66ac9db 1827
019c4ca6
CH		 1828 spin_lock(&dev->delayed_cmd_lock);
1829 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1830 spin_unlock(&dev->delayed_cmd_lock);
1831
1832 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1833 " delayed CMD list, se_ordered_id: %u\n",
1834 cmd->t_task_cdb[0], cmd->sam_task_attr,
1835 cmd->se_ordered_id);
1836 return true;
1837}
1838
1839void target_execute_cmd(struct se_cmd *cmd)
1840{
1841 /*
1842 * If the received CDB has aleady been aborted stop processing it here.
1843 */
4a9a6c8d 1844 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1845 return;
c66ac9db 1846
019c4ca6
CH		 1847 /*
1848 * Determine if frontend context caller is requesting the stopping of
1849 * this command for frontend exceptions.
1850 */
4a9a6c8d 1851 spin_lock_irq(&cmd->t_state_lock);
019c4ca6
CH		 1852 if (cmd->transport_state & CMD_T_STOP) {
1853 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1854 __func__, __LINE__,
1855 cmd->se_tfo->get_task_tag(cmd));
1856
1857 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1858 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1859 return;
1860 }
1861
1862 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1863 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1864 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1865
1866 if (target_write_prot_action(cmd))
1867 return;
019c4ca6 1868
1a398b97
NB		 1869 if (target_handle_task_attr(cmd)) {
1870 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1871 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1872 spin_unlock_irq(&cmd->t_state_lock);
1873 return;
1874 }
1875
1876 __target_execute_cmd(cmd);
c66ac9db 1877}
70baf0ab 1878EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1879
5f41a31d
CH		 1880/*
1881 * Process all commands up to the last received ORDERED task attribute which
1882 * requires another blocking boundary
1883 */
1884static void target_restart_delayed_cmds(struct se_device *dev)
1885{
1886 for (;;) {
1887 struct se_cmd *cmd;
1888
1889 spin_lock(&dev->delayed_cmd_lock);
1890 if (list_empty(&dev->delayed_cmd_list)) {
1891 spin_unlock(&dev->delayed_cmd_lock);
1892 break;
1893 }
1894
1895 cmd = list_entry(dev->delayed_cmd_list.next,
1896 struct se_cmd, se_delayed_node);
1897 list_del(&cmd->se_delayed_node);
1898 spin_unlock(&dev->delayed_cmd_lock);
1899
1900 __target_execute_cmd(cmd);
1901
68d81f40 1902 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1903 break;
1904 }
1905}
1906
c66ac9db 1907/*
35e0e757 1908 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1909 * and ordered cmds need to have their tasks added to the execution queue.
1910 */
1911static void transport_complete_task_attr(struct se_cmd *cmd)
1912{
5951146d 1913 struct se_device *dev = cmd->se_dev;
c66ac9db 1914
a3541703 1915 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1916 return;
1917
68d81f40 1918 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1919 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1920 dev->dev_cur_ordered_id++;
6708bb27 1921 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1922 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1923 cmd->se_ordered_id);
68d81f40 1924 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1925 dev->dev_cur_ordered_id++;
6708bb27 1926 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1927 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1928 cmd->se_ordered_id);
68d81f40 1929 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1930 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1931
1932 dev->dev_cur_ordered_id++;
6708bb27 1933 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1934 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1935 }
c66ac9db 1936
5f41a31d 1937 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1938}
1939
e057f533 1940static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1941{
1942 int ret = 0;
1943
019c4ca6 1944 transport_complete_task_attr(cmd);
e057f533
CH		 1945
1946 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1947 trace_target_cmd_complete(cmd);
e057f533 1948 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1949 goto out;
e057f533 1950 }
07bde79a
NB		 1951
1952 switch (cmd->data_direction) {
1953 case DMA_FROM_DEVICE:
e5c0d6ad 1954 trace_target_cmd_complete(cmd);
07bde79a
NB		 1955 ret = cmd->se_tfo->queue_data_in(cmd);
1956 break;
1957 case DMA_TO_DEVICE:
64577407 1958 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1959 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1960 break;
07bde79a
NB		 1961 }
1962 /* Fall through for DMA_TO_DEVICE */
1963 case DMA_NONE:
e5c0d6ad 1964 trace_target_cmd_complete(cmd);
07bde79a
NB		 1965 ret = cmd->se_tfo->queue_status(cmd);
1966 break;
1967 default:
1968 break;
1969 }
1970
e057f533
CH		 1971out:
1972 if (ret < 0) {
1973 transport_handle_queue_full(cmd, cmd->se_dev);
1974 return;
1975 }
1976 transport_lun_remove_cmd(cmd);
1977 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1978}
1979
1980static void transport_handle_queue_full(
1981 struct se_cmd *cmd,
e057f533 1982 struct se_device *dev)
07bde79a
NB		 1983{
1984 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 1985 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 1986 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 1987 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1988
1989 schedule_work(&cmd->se_dev->qf_work_queue);
1990}
1991
fdeab852 1992static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 1993{
fdeab852
NB		 1994 switch (cmd->prot_op) {
1995 case TARGET_PROT_DIN_STRIP:
1996 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 1997 u32 sectors = cmd->data_length >>
1998 ilog2(cmd->se_dev->dev_attrib.block_size);
1999
2000 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2001 sectors, 0, cmd->t_prot_sg,
2002 0);
2003 if (cmd->pi_err)
fdeab852 2004 return true;
bc005869 2005 }
fdeab852 2006 break;
72c03850
NB		 2007 case TARGET_PROT_DIN_INSERT:
2008 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2009 break;
2010
2011 sbc_dif_generate(cmd);
2012 break;
fdeab852
NB		 2013 default:
2014 break;
bc005869
NB		 2015 }
2016
2017 return false;
2018}
2019
35e0e757 2020static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2021{
35e0e757 2022 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2023 int ret;
35e0e757 2024
c66ac9db
NB		 2025 /*
2026 * Check if we need to move delayed/dormant tasks from cmds on the
2027 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2028 * Attribute.
2029 */
019c4ca6
CH		 2030 transport_complete_task_attr(cmd);
2031
07bde79a
NB		 2032 /*
2033 * Check to schedule QUEUE_FULL work, or execute an existing
2034 * cmd->transport_qf_callback()
2035 */
2036 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2037 schedule_work(&cmd->se_dev->qf_work_queue);
2038
c66ac9db 2039 /*
d5829eac 2040 * Check if we need to send a sense buffer from
c66ac9db
NB		 2041 * the struct se_cmd in question.
2042 */
2043 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2044 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2045 ret = transport_send_check_condition_and_sense(
2046 cmd, 0, 1);
2047 if (ret == -EAGAIN || ret == -ENOMEM)
2048 goto queue_full;
2049
2050 transport_lun_remove_cmd(cmd);
2051 transport_cmd_check_stop_to_fabric(cmd);
2052 return;
c66ac9db
NB		 2053 }
2054 /*
25985edc 2055 * Check for a callback, used by amongst other things
a6b0133c 2056 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2057 */
a6b0133c
NB		 2058 if (cmd->transport_complete_callback) {
2059 sense_reason_t rc;
2060
c8e63985 2061 rc = cmd->transport_complete_callback(cmd, true);
a2890087 2062 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
c8e63985
NB		 2063 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2064 !cmd->data_length)
2065 goto queue_rsp;
2066
a6b0133c 2067 return;
a2890087
NB		 2068 } else if (rc) {
2069 ret = transport_send_check_condition_and_sense(cmd,
2070 rc, 0);
2071 if (ret == -EAGAIN || ret == -ENOMEM)
2072 goto queue_full;
a6b0133c 2073
a2890087
NB		 2074 transport_lun_remove_cmd(cmd);
2075 transport_cmd_check_stop_to_fabric(cmd);
2076 return;
2077 }
a6b0133c 2078 }
c66ac9db 2079
c8e63985 2080queue_rsp:
c66ac9db
NB		 2081 switch (cmd->data_direction) {
2082 case DMA_FROM_DEVICE:
2083 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2084 if (cmd->se_lun->lun_sep) {
2085 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2086 cmd->data_length;
2087 }
2088 spin_unlock(&cmd->se_lun->lun_sep_lock);
bc005869
NB		 2089 /*
2090 * Perform READ_STRIP of PI using software emulation when
2091 * backend had PI enabled, if the transport will not be
2092 * performing hardware READ_STRIP offload.
2093 */
fdeab852 2094 if (target_read_prot_action(cmd)) {
bc005869
NB		 2095 ret = transport_send_check_condition_and_sense(cmd,
2096 cmd->pi_err, 0);
2097 if (ret == -EAGAIN || ret == -ENOMEM)
2098 goto queue_full;
2099
2100 transport_lun_remove_cmd(cmd);
2101 transport_cmd_check_stop_to_fabric(cmd);
2102 return;
2103 }
c66ac9db 2104
e5c0d6ad 2105 trace_target_cmd_complete(cmd);
07bde79a 2106 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2107 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2108 goto queue_full;
c66ac9db
NB		 2109 break;
2110 case DMA_TO_DEVICE:
2111 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2112 if (cmd->se_lun->lun_sep) {
2113 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2114 cmd->data_length;
2115 }
2116 spin_unlock(&cmd->se_lun->lun_sep_lock);
2117 /*
2118 * Check if we need to send READ payload for BIDI-COMMAND
2119 */
64577407 2120 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 2121 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2122 if (cmd->se_lun->lun_sep) {
2123 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2124 cmd->data_length;
2125 }
2126 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2127 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2128 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2129 goto queue_full;
c66ac9db
NB		 2130 break;
2131 }
2132 /* Fall through for DMA_TO_DEVICE */
2133 case DMA_NONE:
e5c0d6ad 2134 trace_target_cmd_complete(cmd);
07bde79a 2135 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2136 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2137 goto queue_full;
c66ac9db
NB		 2138 break;
2139 default:
2140 break;
2141 }
2142
2143 transport_lun_remove_cmd(cmd);
2144 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2145 return;
2146
2147queue_full:
6708bb27 2148 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2149 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2150 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2151 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2152}
2153
6708bb27 2154static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2155{
ec98f782 2156 struct scatterlist *sg;
ec98f782 2157 int count;
c66ac9db 2158
6708bb27
AG		 2159 for_each_sg(sgl, sg, nents, count)
2160 __free_page(sg_page(sg));
c66ac9db 2161
6708bb27
AG		 2162 kfree(sgl);
2163}
c66ac9db 2164
47e459e6
NB		 2165static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2166{
2167 /*
2168 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2169 * emulation, and free + reset pointers if necessary..
2170 */
2171 if (!cmd->t_data_sg_orig)
2172 return;
2173
2174 kfree(cmd->t_data_sg);
2175 cmd->t_data_sg = cmd->t_data_sg_orig;
2176 cmd->t_data_sg_orig = NULL;
2177 cmd->t_data_nents = cmd->t_data_nents_orig;
2178 cmd->t_data_nents_orig = 0;
2179}
2180
6708bb27
AG		 2181static inline void transport_free_pages(struct se_cmd *cmd)
2182{
47e459e6 2183 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2184 /*
2185 * Release special case READ buffer payload required for
2186 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2187 */
2188 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2189 transport_free_sgl(cmd->t_bidi_data_sg,
2190 cmd->t_bidi_data_nents);
2191 cmd->t_bidi_data_sg = NULL;
2192 cmd->t_bidi_data_nents = 0;
2193 }
47e459e6 2194 transport_reset_sgl_orig(cmd);
6708bb27 2195 return;
47e459e6
NB		 2196 }
2197 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2198
2199 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2200 cmd->t_data_sg = NULL;
2201 cmd->t_data_nents = 0;
c66ac9db 2202
6708bb27 2203 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2204 cmd->t_bidi_data_sg = NULL;
2205 cmd->t_bidi_data_nents = 0;
acb2bde3
SG		 2206
2207 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2208 cmd->t_prot_sg = NULL;
2209 cmd->t_prot_nents = 0;
c66ac9db
NB		 2210}
2211
e26d99ae
CH		 2212/**
2213 * transport_release_cmd - free a command
2214 * @cmd: command to free
2215 *
2216 * This routine unconditionally frees a command, and reference counting
2217 * or list removal must be done in the caller.
2218 */
d5ddad41 2219static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2220{
2221 BUG_ON(!cmd->se_tfo);
2222
c8e31f26 2223 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2224 core_tmr_release_req(cmd->se_tmr_req);
2225 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2226 kfree(cmd->t_task_cdb);
2227 /*
7481deb4
NB		 2228 * If this cmd has been setup with target_get_sess_cmd(), drop
2229 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2230 */
ca24976a 2231 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2232}
2233
d3df7825
CH		 2234/**
2235 * transport_put_cmd - release a reference to a command
2236 * @cmd: command to release
2237 *
2238 * This routine releases our reference to the command and frees it if possible.
2239 */
d5ddad41 2240static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2241{
c66ac9db 2242 transport_free_pages(cmd);
d5ddad41 2243 return transport_release_cmd(cmd);
c66ac9db 2244}
c66ac9db 2245
4949314c 2246void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2247{
ec98f782 2248 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2249 struct page **pages;
2250 int i;
05d1c7c0
AG		 2251
2252 /*
ec98f782
AG		 2253 * We need to take into account a possible offset here for fabrics like
2254 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2255 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2256 */
4949314c
AG		 2257 if (!cmd->t_data_nents)
2258 return NULL;
3717ef0c
PB		 2259
2260 BUG_ON(!sg);
2261 if (cmd->t_data_nents == 1)
4949314c
AG		 2262 return kmap(sg_page(sg)) + sg->offset;
2263
2264 /* >1 page. use vmap */
2265 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2266 if (!pages)
4949314c
AG		 2267 return NULL;
2268
2269 /* convert sg[] to pages[] */
2270 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2271 pages[i] = sg_page(sg);
2272 }
2273
2274 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2275 kfree(pages);
de103c93 2276 if (!cmd->t_data_vmap)
4949314c
AG		 2277 return NULL;
2278
2279 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2280}
4949314c 2281EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2282
4949314c 2283void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2284{
a1edf9cf 2285 if (!cmd->t_data_nents) {
4949314c 2286 return;
a1edf9cf 2287 } else if (cmd->t_data_nents == 1) {
4949314c 2288 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2289 return;
2290 }
4949314c
AG		 2291
2292 vunmap(cmd->t_data_vmap);
2293 cmd->t_data_vmap = NULL;
05d1c7c0 2294}
4949314c 2295EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2296
c5ff8d6b 2297int
20093994
NB		 2298target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2299 bool zero_page)
c66ac9db 2300{
20093994 2301 struct scatterlist *sg;
ec98f782 2302 struct page *page;
20093994
NB		 2303 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2304 unsigned int nent;
ec98f782 2305 int i = 0;
c66ac9db 2306
20093994
NB		 2307 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2308 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2309 if (!sg)
ec98f782 2310 return -ENOMEM;
c66ac9db 2311
20093994 2312 sg_init_table(sg, nent);
9db9da33 2313
ec98f782
AG		 2314 while (length) {
2315 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2316 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2317 if (!page)
2318 goto out;
c66ac9db 2319
20093994 2320 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2321 length -= page_len;
2322 i++;
c66ac9db 2323 }
20093994
NB		 2324 *sgl = sg;
2325 *nents = nent;
c66ac9db 2326 return 0;
c66ac9db 2327
ec98f782 2328out:
d0e27c88 2329 while (i > 0) {
ec98f782 2330 i--;
20093994 2331 __free_page(sg_page(&sg[i]));
c66ac9db 2332 }
20093994 2333 kfree(sg);
ec98f782 2334 return -ENOMEM;
c66ac9db
NB		 2335}
2336
da0f7619 2337/*
b16a35b0
AG		 2338 * Allocate any required resources to execute the command. For writes we
2339 * might not have the payload yet, so notify the fabric via a call to
2340 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2341 */
de103c93
CH		 2342sense_reason_t
2343transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2344{
c66ac9db 2345 int ret = 0;
c8e63985 2346 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db
NB		 2347
2348 /*
2349 * Determine is the TCM fabric module has already allocated physical
2350 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2351 * beforehand.
c66ac9db 2352 */
ec98f782
AG		 2353 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2354 cmd->data_length) {
20093994 2355
8cefe07b
NB		 2356 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2357 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2358 u32 bidi_length;
2359
2360 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2361 bidi_length = cmd->t_task_nolb *
2362 cmd->se_dev->dev_attrib.block_size;
2363 else
2364 bidi_length = cmd->data_length;
2365
2366 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2367 &cmd->t_bidi_data_nents,
2368 bidi_length, zero_flag);
2369 if (ret < 0)
2370 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2371 }
2372
19f9361a 2373 if (cmd->prot_op != TARGET_PROT_NORMAL) {
acb2bde3
SG		 2374 ret = target_alloc_sgl(&cmd->t_prot_sg,
2375 &cmd->t_prot_nents,
2376 cmd->prot_length, true);
2377 if (ret < 0)
2378 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2379 }
2380
20093994
NB		 2381 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2382 cmd->data_length, zero_flag);
c66ac9db 2383 if (ret < 0)
de103c93 2384 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2385 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2386 cmd->data_length) {
2387 /*
2388 * Special case for COMPARE_AND_WRITE with fabrics
2389 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2390 */
2391 u32 caw_length = cmd->t_task_nolb *
2392 cmd->se_dev->dev_attrib.block_size;
2393
2394 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2395 &cmd->t_bidi_data_nents,
2396 caw_length, zero_flag);
2397 if (ret < 0)
2398 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2399 }
c66ac9db 2400 /*
c3196f0c
CH		 2401 * If this command is not a write we can execute it right here,
2402 * for write buffers we need to notify the fabric driver first
2403 * and let it call back once the write buffers are ready.
c66ac9db 2404 */
5f41a31d 2405 target_add_to_state_list(cmd);
885e7b0e 2406 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2407 target_execute_cmd(cmd);
2408 return 0;
2409 }
862e6389 2410 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2411
2412 ret = cmd->se_tfo->write_pending(cmd);
2413 if (ret == -EAGAIN || ret == -ENOMEM)
2414 goto queue_full;
2415
de103c93
CH		 2416 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2417 WARN_ON(ret);
2418
b69c1fcf 2419 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2420
c3196f0c
CH		 2421queue_full:
2422 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2423 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2424 transport_handle_queue_full(cmd, cmd->se_dev);
2425 return 0;
c66ac9db 2426}
a1d8b49a 2427EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2428
e057f533 2429static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2430{
f147abb4
NB		 2431 int ret;
2432
2433 ret = cmd->se_tfo->write_pending(cmd);
2434 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2435 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2436 cmd);
2437 transport_handle_queue_full(cmd, cmd->se_dev);
2438 }
07bde79a
NB		 2439}
2440
d5ddad41 2441int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2442{
c130480b 2443 unsigned long flags;
d5ddad41
NB		 2444 int ret = 0;
2445
d14921d6 2446 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2447 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2448 transport_wait_for_tasks(cmd);
2449
d5ddad41 2450 ret = transport_release_cmd(cmd);
d14921d6
NB		 2451 } else {
2452 if (wait_for_tasks)
2453 transport_wait_for_tasks(cmd);
c130480b
NB		 2454 /*
2455 * Handle WRITE failure case where transport_generic_new_cmd()
2456 * has already added se_cmd to state_list, but fabric has
2457 * failed command before I/O submission.
2458 */
2459 if (cmd->state_active) {
2460 spin_lock_irqsave(&cmd->t_state_lock, flags);
2461 target_remove_from_state_list(cmd);
2462 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2463 }
d14921d6 2464
82f1c8a4 2465 if (cmd->se_lun)
c66ac9db 2466 transport_lun_remove_cmd(cmd);
c66ac9db 2467
d5ddad41 2468 ret = transport_put_cmd(cmd);
c66ac9db 2469 }
d5ddad41 2470 return ret;
c66ac9db
NB		 2471}
2472EXPORT_SYMBOL(transport_generic_free_cmd);
2473
a17f091d
NB		 2474/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2475 * @se_sess: session to reference
2476 * @se_cmd: command descriptor to add
a6360785 2477 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2478 */
20361e69 2479int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2480 bool ack_kref)
a17f091d
NB		 2481{
2482 unsigned long flags;
bc187ea6 2483 int ret = 0;
a17f091d 2484
a6360785
NB		 2485 /*
2486 * Add a second kref if the fabric caller is expecting to handle
2487 * fabric acknowledgement that requires two target_put_sess_cmd()
2488 * invocations before se_cmd descriptor release.
2489 */
054922bb 2490 if (ack_kref)
a6360785 2491 kref_get(&se_cmd->cmd_kref);
7481deb4 2492
a17f091d 2493 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2494 if (se_sess->sess_tearing_down) {
2495 ret = -ESHUTDOWN;
2496 goto out;
2497 }
a17f091d 2498 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2499out:
a17f091d 2500 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2501
2502 if (ret && ack_kref)
2503 target_put_sess_cmd(se_sess, se_cmd);
2504
bc187ea6 2505 return ret;
a17f091d 2506}
20361e69 2507EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2508
7481deb4 2509static void target_release_cmd_kref(struct kref *kref)
077aa3b2 2510 __releases(&se_cmd->se_sess->sess_cmd_lock)
a17f091d 2511{
7481deb4
NB		 2512 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2513 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2514
a17f091d 2515 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2516 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2517 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2518 return;
a17f091d 2519 }
a17f091d 2520 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2521 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2522 complete(&se_cmd->cmd_wait_comp);
7481deb4 2523 return;
a17f091d
NB		 2524 }
2525 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2526 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2527
7481deb4
NB		 2528 se_cmd->se_tfo->release_cmd(se_cmd);
2529}
2530
2531/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2532 * @se_sess: session to reference
2533 * @se_cmd: command descriptor to drop
2534 */
2535int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2536{
0ed6e189
NB		 2537 if (!se_sess) {
2538 se_cmd->se_tfo->release_cmd(se_cmd);
2539 return 1;
2540 }
ccf5ae83
JE		 2541 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2542 &se_sess->sess_cmd_lock);
a17f091d
NB		 2543}
2544EXPORT_SYMBOL(target_put_sess_cmd);
2545
1c7b13fe
RD		 2546/* target_sess_cmd_list_set_waiting - Flag all commands in
2547 * sess_cmd_list to complete cmd_wait_comp. Set
2548 * sess_tearing_down so no more commands are queued.
2549 * @se_sess: session to flag
a17f091d 2550 */
1c7b13fe 2551void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2552{
2553 struct se_cmd *se_cmd;
2554 unsigned long flags;
2555
a17f091d 2556 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2557 if (se_sess->sess_tearing_down) {
2558 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2559 return;
2560 }
1c7b13fe 2561 se_sess->sess_tearing_down = 1;
9b31a328 2562 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2563
9b31a328 2564 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2565 se_cmd->cmd_wait_set = 1;
2566
2567 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2568}
1c7b13fe 2569EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2570
2571/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2572 * @se_sess: session to wait for active I/O
a17f091d 2573 */
be646c2d 2574void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2575{
2576 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2577 unsigned long flags;
a17f091d
NB		 2578
2579 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2580 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2581 list_del(&se_cmd->se_cmd_list);
2582
2583 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2584 " %d\n", se_cmd, se_cmd->t_state,
2585 se_cmd->se_tfo->get_cmd_state(se_cmd));
2586
be646c2d
JE		 2587 wait_for_completion(&se_cmd->cmd_wait_comp);
2588 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2589 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2590 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2591
2592 se_cmd->se_tfo->release_cmd(se_cmd);
2593 }
9b31a328
NB		 2594
2595 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2596 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2597 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2598
a17f091d
NB		 2599}
2600EXPORT_SYMBOL(target_wait_for_sess_cmds);
2601
5277797d 2602static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2603{
8359cf43 2604 struct se_lun *lun = p;
c66ac9db 2605
5277797d
NB		 2606 percpu_ref_kill(&lun->lun_ref);
2607
2608 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2609 complete(&lun->lun_shutdown_comp);
2610
2611 return 0;
2612}
2613
5277797d 2614int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2615{
2616 struct task_struct *kt;
2617
5277797d 2618 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2619 "tcm_cl_%u", lun->unpacked_lun);
2620 if (IS_ERR(kt)) {
6708bb27 2621 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2622 return PTR_ERR(kt);
c66ac9db
NB		 2623 }
2624 wait_for_completion(&lun->lun_shutdown_comp);
2625
2626 return 0;
2627}
2628
d14921d6
NB		 2629/**
2630 * transport_wait_for_tasks - wait for completion to occur
2631 * @cmd: command to wait
c66ac9db 2632 *
d14921d6
NB		 2633 * Called from frontend fabric context to wait for storage engine
2634 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2635 */
a17f091d 2636bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2637{
2638 unsigned long flags;
2639
a1d8b49a 2640 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2641 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2642 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2643 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2644 return false;
d14921d6 2645 }
cb4f4d3c 2646
c8e31f26
AG		 2647 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2648 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2649 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2650 return false;
d14921d6 2651 }
7d680f3b 2652
3d28934a 2653 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2654 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2655 return false;
d14921d6 2656 }
c66ac9db 2657
7d680f3b 2658 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2659
6708bb27 2660 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2661 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2662 cmd, cmd->se_tfo->get_task_tag(cmd),
2663 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2664
a1d8b49a 2665 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2666
a1d8b49a 2667 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2668
a1d8b49a 2669 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2670 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2671
35d1efe8 2672 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2673 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2674 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2675
d14921d6 2676 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2677
2678 return true;
c66ac9db 2679}
d14921d6 2680EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2681
2682static int transport_get_sense_codes(
2683 struct se_cmd *cmd,
2684 u8 *asc,
2685 u8 *ascq)
2686{
2687 *asc = cmd->scsi_asc;
2688 *ascq = cmd->scsi_ascq;
2689
2690 return 0;
2691}
2692
76736db3
SG		 2693static
2694void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2695{
2696 /* Place failed LBA in sense data information descriptor 0. */
2697 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2698 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2699 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2700 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2701
2702 /* Descriptor Information: failing sector */
2703 put_unaligned_be64(bad_sector, &buffer[12]);
2704}
2705
de103c93
CH		 2706int
2707transport_send_check_condition_and_sense(struct se_cmd *cmd,
2708 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2709{
2710 unsigned char *buffer = cmd->sense_buffer;
2711 unsigned long flags;
c66ac9db
NB		 2712 u8 asc = 0, ascq = 0;
2713
a1d8b49a 2714 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2715 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2716 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2717 return 0;
2718 }
2719 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2720 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2721
2722 if (!reason && from_transport)
2723 goto after_reason;
2724
2725 if (!from_transport)
2726 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2727
c66ac9db
NB		 2728 /*
2729 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2730 * SENSE KEY values from include/scsi/scsi.h
2731 */
2732 switch (reason) {
ba829137
HR		 2733 case TCM_NO_SENSE:
2734 /* CURRENT ERROR */
2735 buffer[0] = 0x70;
2736 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2737 /* Not Ready */
2738 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2739 /* NO ADDITIONAL SENSE INFORMATION */
2740 buffer[SPC_ASC_KEY_OFFSET] = 0;
2741 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2742 break;
c66ac9db 2743 case TCM_NON_EXISTENT_LUN:
eb39d340 2744 /* CURRENT ERROR */
9c58b7dd
RD		 2745 buffer[0] = 0x70;
2746 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2747 /* ILLEGAL REQUEST */
9c58b7dd 2748 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2749 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2750 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2751 break;
c66ac9db
NB		 2752 case TCM_UNSUPPORTED_SCSI_OPCODE:
2753 case TCM_SECTOR_COUNT_TOO_MANY:
2754 /* CURRENT ERROR */
9c58b7dd
RD		 2755 buffer[0] = 0x70;
2756 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2757 /* ILLEGAL REQUEST */
9c58b7dd 2758 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2759 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2760 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2761 break;
2762 case TCM_UNKNOWN_MODE_PAGE:
2763 /* CURRENT ERROR */
9c58b7dd
RD		 2764 buffer[0] = 0x70;
2765 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2766 /* ILLEGAL REQUEST */
9c58b7dd 2767 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2768 /* INVALID FIELD IN CDB */
9c58b7dd 2769 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2770 break;
2771 case TCM_CHECK_CONDITION_ABORT_CMD:
2772 /* CURRENT ERROR */
9c58b7dd
RD		 2773 buffer[0] = 0x70;
2774 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2775 /* ABORTED COMMAND */
9c58b7dd 2776 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2777 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2778 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2779 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2780 break;
2781 case TCM_INCORRECT_AMOUNT_OF_DATA:
2782 /* CURRENT ERROR */
9c58b7dd
RD		 2783 buffer[0] = 0x70;
2784 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2785 /* ABORTED COMMAND */
9c58b7dd 2786 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2787 /* WRITE ERROR */
9c58b7dd 2788 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2789 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2790 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2791 break;
2792 case TCM_INVALID_CDB_FIELD:
2793 /* CURRENT ERROR */
9c58b7dd
RD		 2794 buffer[0] = 0x70;
2795 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2796 /* ILLEGAL REQUEST */
9c58b7dd 2797 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2798 /* INVALID FIELD IN CDB */
9c58b7dd 2799 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2800 break;
2801 case TCM_INVALID_PARAMETER_LIST:
2802 /* CURRENT ERROR */
9c58b7dd
RD		 2803 buffer[0] = 0x70;
2804 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2805 /* ILLEGAL REQUEST */
9c58b7dd 2806 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2807 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2808 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2809 break;
bb992e72
RD		 2810 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2811 /* CURRENT ERROR */
2812 buffer[0] = 0x70;
2813 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2814 /* ILLEGAL REQUEST */
2815 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2816 /* PARAMETER LIST LENGTH ERROR */
2817 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2818 break;
c66ac9db
NB		 2819 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2820 /* CURRENT ERROR */
9c58b7dd
RD		 2821 buffer[0] = 0x70;
2822 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2823 /* ABORTED COMMAND */
9c58b7dd 2824 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2825 /* WRITE ERROR */
9c58b7dd 2826 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2827 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2828 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2829 break;
2830 case TCM_SERVICE_CRC_ERROR:
2831 /* CURRENT ERROR */
9c58b7dd
RD		 2832 buffer[0] = 0x70;
2833 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2834 /* ABORTED COMMAND */
9c58b7dd 2835 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2836 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2837 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2838 /* N/A */
9c58b7dd 2839 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2840 break;
2841 case TCM_SNACK_REJECTED:
2842 /* CURRENT ERROR */
9c58b7dd
RD		 2843 buffer[0] = 0x70;
2844 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2845 /* ABORTED COMMAND */
9c58b7dd 2846 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2847 /* READ ERROR */
9c58b7dd 2848 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2849 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2850 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2851 break;
2852 case TCM_WRITE_PROTECTED:
2853 /* CURRENT ERROR */
9c58b7dd
RD		 2854 buffer[0] = 0x70;
2855 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2856 /* DATA PROTECT */
9c58b7dd 2857 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2858 /* WRITE PROTECTED */
9c58b7dd 2859 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2860 break;
e2397c70
RD		 2861 case TCM_ADDRESS_OUT_OF_RANGE:
2862 /* CURRENT ERROR */
9c58b7dd
RD		 2863 buffer[0] = 0x70;
2864 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2865 /* ILLEGAL REQUEST */
9c58b7dd 2866 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2867 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2868 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2869 break;
c66ac9db
NB		 2870 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2871 /* CURRENT ERROR */
9c58b7dd
RD		 2872 buffer[0] = 0x70;
2873 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2874 /* UNIT ATTENTION */
9c58b7dd 2875 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2876 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2877 buffer[SPC_ASC_KEY_OFFSET] = asc;
2878 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2879 break;
2880 case TCM_CHECK_CONDITION_NOT_READY:
2881 /* CURRENT ERROR */
9c58b7dd
RD		 2882 buffer[0] = 0x70;
2883 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2884 /* Not Ready */
9c58b7dd 2885 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2886 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2887 buffer[SPC_ASC_KEY_OFFSET] = asc;
2888 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2889 break;
818b571c
NB		 2890 case TCM_MISCOMPARE_VERIFY:
2891 /* CURRENT ERROR */
2892 buffer[0] = 0x70;
2893 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2894 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2895 /* MISCOMPARE DURING VERIFY OPERATION */
2896 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2897 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2898 break;
fcc4f17b
NB		 2899 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2900 /* CURRENT ERROR */
2901 buffer[0] = 0x70;
2902 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2903 /* ILLEGAL REQUEST */
2904 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2905 /* LOGICAL BLOCK GUARD CHECK FAILED */
2906 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2907 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
76736db3 2908 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2909 break;
2910 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2911 /* CURRENT ERROR */
2912 buffer[0] = 0x70;
2913 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2914 /* ILLEGAL REQUEST */
2915 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2916 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2917 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2918 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
76736db3 2919 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2920 break;
2921 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2922 /* CURRENT ERROR */
2923 buffer[0] = 0x70;
2924 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2925 /* ILLEGAL REQUEST */
2926 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2927 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2928 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2929 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
76736db3 2930 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b 2931 break;
c66ac9db
NB		 2932 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2933 default:
2934 /* CURRENT ERROR */
9c58b7dd
RD		 2935 buffer[0] = 0x70;
2936 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2937 /*
2938 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2939 * Solaris initiators. Returning NOT READY instead means the
2940 * operations will be retried a finite number of times and we
2941 * can survive intermittent errors.
2942 */
2943 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2944 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2945 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2946 break;
2947 }
2948 /*
2949 * This code uses linux/include/scsi/scsi.h SAM status codes!
2950 */
2951 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2952 /*
2953 * Automatically padded, this value is encoded in the fabric's
2954 * data_length response PDU containing the SCSI defined sense data.
2955 */
9c58b7dd 2956 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2957
2958after_reason:
e5c0d6ad 2959 trace_target_cmd_complete(cmd);
07bde79a 2960 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2961}
2962EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2963
2964int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2965{
c18bc7d8
RD		 2966 if (!(cmd->transport_state & CMD_T_ABORTED))
2967 return 0;
c66ac9db 2968
68259b5a
AL		 2969 /*
2970 * If cmd has been aborted but either no status is to be sent or it has
2971 * already been sent, just return
2972 */
2973 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2974 return 1;
8b1e1244 2975
c18bc7d8
RD		 2976 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2977 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2978
68259b5a 2979 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2980 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2981 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2982 cmd->se_tfo->queue_status(cmd);
2983
2984 return 1;
c66ac9db
NB		 2985}
2986EXPORT_SYMBOL(transport_check_aborted_status);
2987
2988void transport_send_task_abort(struct se_cmd *cmd)
2989{
c252f003
NB		 2990 unsigned long flags;
2991
2992 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2993 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2994 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2995 return;
2996 }
2997 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2998
c66ac9db
NB		 2999 /*
3000 * If there are still expected incoming fabric WRITEs, we wait
3001 * until until they have completed before sending a TASK_ABORTED
3002 * response. This response with TASK_ABORTED status will be
3003 * queued back to fabric module by transport_check_aborted_status().
3004 */
3005 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3006 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 3007 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 3008 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
29f4c090 3009 return;
c66ac9db
NB		 3010 }
3011 }
3012 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3013
72b59d6e
RD		 3014 transport_lun_remove_cmd(cmd);
3015
6708bb27 3016 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 3017 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 3018 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3019
e5c0d6ad 3020 trace_target_cmd_complete(cmd);
e3d6f909 3021 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3022}
3023
af877292 3024static void target_tmr_work(struct work_struct *work)
c66ac9db 3025{
af877292 3026 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3027 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3028 struct se_tmr_req *tmr = cmd->se_tmr_req;
3029 int ret;
3030
3031 switch (tmr->function) {
5c6cd613 3032 case TMR_ABORT_TASK:
3d28934a 3033 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3034 break;
5c6cd613
NB		 3035 case TMR_ABORT_TASK_SET:
3036 case TMR_CLEAR_ACA:
3037 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3038 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3039 break;
5c6cd613 3040 case TMR_LUN_RESET:
c66ac9db
NB		 3041 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3042 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3043 TMR_FUNCTION_REJECTED;
3044 break;
5c6cd613 3045 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3046 tmr->response = TMR_FUNCTION_REJECTED;
3047 break;
5c6cd613 3048 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3049 tmr->response = TMR_FUNCTION_REJECTED;
3050 break;
c66ac9db 3051 default:
6708bb27 3052 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3053 tmr->function);
3054 tmr->response = TMR_FUNCTION_REJECTED;
3055 break;
3056 }
3057
3058 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3059 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3060
b7b8bef7 3061 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3062}
3063
af877292
CH		 3064int transport_generic_handle_tmr(
3065 struct se_cmd *cmd)
c66ac9db 3066{
f15e9cd9
NB		 3067 unsigned long flags;
3068
3069 spin_lock_irqsave(&cmd->t_state_lock, flags);
3070 cmd->transport_state |= CMD_T_ACTIVE;
3071 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3072
af877292
CH		 3073 INIT_WORK(&cmd->work, target_tmr_work);
3074 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3075 return 0;
3076}
af877292 3077EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3078
3079bool
3080target_check_wce(struct se_device *dev)
3081{
3082 bool wce = false;
3083
3084 if (dev->transport->get_write_cache)
3085 wce = dev->transport->get_write_cache(dev);
3086 else if (dev->dev_attrib.emulate_write_cache > 0)
3087 wce = true;
3088
3089 return wce;
3090}
3091
3092bool
3093target_check_fua(struct se_device *dev)
3094{
3095 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3096}
Linux kernel - Deliverables
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