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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
[linux-2.6-block.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
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>
5538d294 37#include <linux/vmalloc.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
ba929992 41#include <scsi/scsi_proto.h>
9ec1e1ce 42#include <scsi/scsi_common.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 47
e26d99ae 48#include "target_core_internal.h"
c66ac9db 49#include "target_core_alua.h"
c66ac9db 50#include "target_core_pr.h"
c66ac9db
NB		 51#include "target_core_ua.h"
52
e5c0d6ad
RD		 53#define CREATE_TRACE_POINTS
54#include <trace/events/target.h>
55
35e0e757 56static struct workqueue_struct *target_completion_wq;
c66ac9db 57static struct kmem_cache *se_sess_cache;
c66ac9db 58struct kmem_cache *se_ua_cache;
c66ac9db
NB		 59struct kmem_cache *t10_pr_reg_cache;
60struct kmem_cache *t10_alua_lu_gp_cache;
61struct kmem_cache *t10_alua_lu_gp_mem_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_cache;
229d4f11
HR		 63struct kmem_cache *t10_alua_lba_map_cache;
64struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 65
c66ac9db 66static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 67static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 68 struct se_device *dev);
d5ddad41 69static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 70static void target_complete_ok_work(struct work_struct *work);
c66ac9db 71
e3d6f909 72int init_se_kmem_caches(void)
c66ac9db 73{
c66ac9db
NB		 74 se_sess_cache = kmem_cache_create("se_sess_cache",
75 sizeof(struct se_session), __alignof__(struct se_session),
76 0, NULL);
6708bb27
AG		 77 if (!se_sess_cache) {
78 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 79 " failed\n");
c8e31f26 80 goto out;
c66ac9db
NB		 81 }
82 se_ua_cache = kmem_cache_create("se_ua_cache",
83 sizeof(struct se_ua), __alignof__(struct se_ua),
84 0, NULL);
6708bb27
AG		 85 if (!se_ua_cache) {
86 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 87 goto out_free_sess_cache;
c66ac9db 88 }
c66ac9db
NB		 89 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
90 sizeof(struct t10_pr_registration),
91 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 92 if (!t10_pr_reg_cache) {
93 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 94 " failed\n");
35e0e757 95 goto out_free_ua_cache;
c66ac9db
NB		 96 }
97 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
98 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
99 0, NULL);
6708bb27
AG		 100 if (!t10_alua_lu_gp_cache) {
101 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 102 " failed\n");
35e0e757 103 goto out_free_pr_reg_cache;
c66ac9db
NB		 104 }
105 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
106 sizeof(struct t10_alua_lu_gp_member),
107 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 108 if (!t10_alua_lu_gp_mem_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 110 "cache failed\n");
35e0e757 111 goto out_free_lu_gp_cache;
c66ac9db
NB		 112 }
113 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
114 sizeof(struct t10_alua_tg_pt_gp),
115 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 116 if (!t10_alua_tg_pt_gp_cache) {
117 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 118 "cache failed\n");
35e0e757 119 goto out_free_lu_gp_mem_cache;
c66ac9db 120 }
229d4f11
HR		 121 t10_alua_lba_map_cache = kmem_cache_create(
122 "t10_alua_lba_map_cache",
123 sizeof(struct t10_alua_lba_map),
124 __alignof__(struct t10_alua_lba_map), 0, NULL);
125 if (!t10_alua_lba_map_cache) {
126 pr_err("kmem_cache_create() for t10_alua_lba_map_"
127 "cache failed\n");
adf653f9 128 goto out_free_tg_pt_gp_cache;
229d4f11
HR		 129 }
130 t10_alua_lba_map_mem_cache = kmem_cache_create(
131 "t10_alua_lba_map_mem_cache",
132 sizeof(struct t10_alua_lba_map_member),
133 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
134 if (!t10_alua_lba_map_mem_cache) {
135 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
136 "cache failed\n");
137 goto out_free_lba_map_cache;
138 }
c66ac9db 139
35e0e757
CH		 140 target_completion_wq = alloc_workqueue("target_completion",
141 WQ_MEM_RECLAIM, 0);
142 if (!target_completion_wq)
229d4f11 143 goto out_free_lba_map_mem_cache;
35e0e757 144
c66ac9db 145 return 0;
35e0e757 146
229d4f11
HR		 147out_free_lba_map_mem_cache:
148 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
149out_free_lba_map_cache:
150 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 151out_free_tg_pt_gp_cache:
152 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
153out_free_lu_gp_mem_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
155out_free_lu_gp_cache:
156 kmem_cache_destroy(t10_alua_lu_gp_cache);
157out_free_pr_reg_cache:
158 kmem_cache_destroy(t10_pr_reg_cache);
159out_free_ua_cache:
160 kmem_cache_destroy(se_ua_cache);
161out_free_sess_cache:
162 kmem_cache_destroy(se_sess_cache);
c66ac9db 163out:
e3d6f909 164 return -ENOMEM;
c66ac9db
NB		 165}
166
e3d6f909 167void release_se_kmem_caches(void)
c66ac9db 168{
35e0e757 169 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 170 kmem_cache_destroy(se_sess_cache);
171 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 172 kmem_cache_destroy(t10_pr_reg_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
229d4f11
HR		 176 kmem_cache_destroy(t10_alua_lba_map_cache);
177 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 178}
179
e3d6f909
AG		 180/* This code ensures unique mib indexes are handed out. */
181static DEFINE_SPINLOCK(scsi_mib_index_lock);
182static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 183
184/*
185 * Allocate a new row index for the entry type specified
186 */
187u32 scsi_get_new_index(scsi_index_t type)
188{
189 u32 new_index;
190
e3d6f909 191 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 192
e3d6f909
AG		 193 spin_lock(&scsi_mib_index_lock);
194 new_index = ++scsi_mib_index[type];
195 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 196
197 return new_index;
198}
199
dbc5623e 200void transport_subsystem_check_init(void)
c66ac9db
NB		 201{
202 int ret;
283669d2 203 static int sub_api_initialized;
c66ac9db 204
dbc5623e
NB		 205 if (sub_api_initialized)
206 return;
207
c66ac9db
NB		 208 ret = request_module("target_core_iblock");
209 if (ret != 0)
6708bb27 210 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 211
212 ret = request_module("target_core_file");
213 if (ret != 0)
6708bb27 214 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 215
216 ret = request_module("target_core_pscsi");
217 if (ret != 0)
6708bb27 218 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 219
7c9e7a6f
AG		 220 ret = request_module("target_core_user");
221 if (ret != 0)
222 pr_err("Unable to load target_core_user\n");
223
e3d6f909 224 sub_api_initialized = 1;
c66ac9db
NB		 225}
226
e70beee7 227struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 228{
229 struct se_session *se_sess;
230
231 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 232 if (!se_sess) {
233 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 234 " se_sess_cache\n");
235 return ERR_PTR(-ENOMEM);
236 }
237 INIT_LIST_HEAD(&se_sess->sess_list);
238 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 239 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 240 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 241 spin_lock_init(&se_sess->sess_cmd_lock);
e70beee7 242 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 243
244 return se_sess;
245}
246EXPORT_SYMBOL(transport_init_session);
247
c0add7fd
NB		 248int transport_alloc_session_tags(struct se_session *se_sess,
249 unsigned int tag_num, unsigned int tag_size)
250{
251 int rc;
252
8c7f6e9b
NB		 253 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
254 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 255 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 256 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
257 if (!se_sess->sess_cmd_map) {
258 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
259 return -ENOMEM;
260 }
c0add7fd
NB		 261 }
262
263 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
264 if (rc < 0) {
265 pr_err("Unable to init se_sess->sess_tag_pool,"
266 " tag_num: %u\n", tag_num);
de64d3a6 267 kvfree(se_sess->sess_cmd_map);
c0add7fd
NB		 268 se_sess->sess_cmd_map = NULL;
269 return -ENOMEM;
270 }
271
272 return 0;
273}
274EXPORT_SYMBOL(transport_alloc_session_tags);
275
276struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 277 unsigned int tag_size,
278 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 279{
280 struct se_session *se_sess;
281 int rc;
282
7861728d
NB		 283 if (tag_num != 0 && !tag_size) {
284 pr_err("init_session_tags called with percpu-ida tag_num:"
285 " %u, but zero tag_size\n", tag_num);
286 return ERR_PTR(-EINVAL);
287 }
288 if (!tag_num && tag_size) {
289 pr_err("init_session_tags called with percpu-ida tag_size:"
290 " %u, but zero tag_num\n", tag_size);
291 return ERR_PTR(-EINVAL);
292 }
293
e70beee7 294 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 295 if (IS_ERR(se_sess))
296 return se_sess;
297
298 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
299 if (rc < 0) {
300 transport_free_session(se_sess);
301 return ERR_PTR(-ENOMEM);
302 }
303
304 return se_sess;
305}
306EXPORT_SYMBOL(transport_init_session_tags);
307
c66ac9db 308/*
140854cb 309 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 310 */
311void __transport_register_session(
312 struct se_portal_group *se_tpg,
313 struct se_node_acl *se_nacl,
314 struct se_session *se_sess,
315 void *fabric_sess_ptr)
316{
9ac8928e 317 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 318 unsigned char buf[PR_REG_ISID_LEN];
319
320 se_sess->se_tpg = se_tpg;
321 se_sess->fabric_sess_ptr = fabric_sess_ptr;
322 /*
323 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
324 *
325 * Only set for struct se_session's that will actually be moving I/O.
326 * eg: *NOT* discovery sessions.
327 */
328 if (se_nacl) {
bffb5128
NB		 329 /*
330 *
331 * Determine if fabric allows for T10-PI feature bits exposed to
332 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
333 *
334 * If so, then always save prot_type on a per se_node_acl node
335 * basis and re-instate the previous sess_prot_type to avoid
336 * disabling PI from below any previously initiator side
337 * registered LUNs.
338 */
339 if (se_nacl->saved_prot_type)
340 se_sess->sess_prot_type = se_nacl->saved_prot_type;
341 else if (tfo->tpg_check_prot_fabric_only)
342 se_sess->sess_prot_type = se_nacl->saved_prot_type =
343 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 344 /*
345 * If the fabric module supports an ISID based TransportID,
346 * save this value in binary from the fabric I_T Nexus now.
347 */
e3d6f909 348 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 349 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 350 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 351 &buf[0], PR_REG_ISID_LEN);
352 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
353 }
afb999ff 354
c66ac9db
NB		 355 spin_lock_irq(&se_nacl->nacl_sess_lock);
356 /*
357 * The se_nacl->nacl_sess pointer will be set to the
358 * last active I_T Nexus for each struct se_node_acl.
359 */
360 se_nacl->nacl_sess = se_sess;
361
362 list_add_tail(&se_sess->sess_acl_list,
363 &se_nacl->acl_sess_list);
364 spin_unlock_irq(&se_nacl->nacl_sess_lock);
365 }
366 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
367
6708bb27 368 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 369 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 370}
371EXPORT_SYMBOL(__transport_register_session);
372
373void transport_register_session(
374 struct se_portal_group *se_tpg,
375 struct se_node_acl *se_nacl,
376 struct se_session *se_sess,
377 void *fabric_sess_ptr)
378{
140854cb
NB		 379 unsigned long flags;
380
381 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 382 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 383 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 384}
385EXPORT_SYMBOL(transport_register_session);
386
7861728d
NB		 387struct se_session *
388target_alloc_session(struct se_portal_group *tpg,
389 unsigned int tag_num, unsigned int tag_size,
390 enum target_prot_op prot_op,
391 const char *initiatorname, void *private,
392 int (*callback)(struct se_portal_group *,
393 struct se_session *, void *))
394{
395 struct se_session *sess;
396
397 /*
398 * If the fabric driver is using percpu-ida based pre allocation
399 * of I/O descriptor tags, go ahead and perform that setup now..
400 */
401 if (tag_num != 0)
402 sess = transport_init_session_tags(tag_num, tag_size, prot_op);
403 else
404 sess = transport_init_session(prot_op);
405
406 if (IS_ERR(sess))
407 return sess;
408
409 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
410 (unsigned char *)initiatorname);
411 if (!sess->se_node_acl) {
412 transport_free_session(sess);
413 return ERR_PTR(-EACCES);
414 }
415 /*
416 * Go ahead and perform any remaining fabric setup that is
417 * required before transport_register_session().
418 */
419 if (callback != NULL) {
420 int rc = callback(tpg, sess, private);
421 if (rc) {
422 transport_free_session(sess);
423 return ERR_PTR(rc);
424 }
425 }
426
427 transport_register_session(tpg, sess->se_node_acl, sess, private);
428 return sess;
429}
430EXPORT_SYMBOL(target_alloc_session);
431
f8e471f9
NB		 432ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
433{
434 struct se_session *se_sess;
435 ssize_t len = 0;
436
437 spin_lock_bh(&se_tpg->session_lock);
438 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
439 if (!se_sess->se_node_acl)
440 continue;
441 if (!se_sess->se_node_acl->dynamic_node_acl)
442 continue;
443 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
444 break;
445
446 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
447 se_sess->se_node_acl->initiatorname);
448 len += 1; /* Include NULL terminator */
449 }
450 spin_unlock_bh(&se_tpg->session_lock);
451
452 return len;
453}
454EXPORT_SYMBOL(target_show_dynamic_sessions);
455
afb999ff
NB		 456static void target_complete_nacl(struct kref *kref)
457{
458 struct se_node_acl *nacl = container_of(kref,
459 struct se_node_acl, acl_kref);
460
461 complete(&nacl->acl_free_comp);
462}
463
464void target_put_nacl(struct se_node_acl *nacl)
465{
466 kref_put(&nacl->acl_kref, target_complete_nacl);
467}
21aaa23b 468EXPORT_SYMBOL(target_put_nacl);
afb999ff 469
c66ac9db
NB		 470void transport_deregister_session_configfs(struct se_session *se_sess)
471{
472 struct se_node_acl *se_nacl;
23388864 473 unsigned long flags;
c66ac9db
NB		 474 /*
475 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
476 */
477 se_nacl = se_sess->se_node_acl;
6708bb27 478 if (se_nacl) {
23388864 479 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
fba81f88
CH		 480 if (!list_empty(&se_sess->sess_acl_list))
481 list_del_init(&se_sess->sess_acl_list);
c66ac9db
NB		 482 /*
483 * If the session list is empty, then clear the pointer.
484 * Otherwise, set the struct se_session pointer from the tail
485 * element of the per struct se_node_acl active session list.
486 */
487 if (list_empty(&se_nacl->acl_sess_list))
488 se_nacl->nacl_sess = NULL;
489 else {
490 se_nacl->nacl_sess = container_of(
491 se_nacl->acl_sess_list.prev,
492 struct se_session, sess_acl_list);
493 }
23388864 494 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 495 }
496}
497EXPORT_SYMBOL(transport_deregister_session_configfs);
498
499void transport_free_session(struct se_session *se_sess)
500{
21aaa23b
NB		 501 struct se_node_acl *se_nacl = se_sess->se_node_acl;
502 /*
503 * Drop the se_node_acl->nacl_kref obtained from within
504 * core_tpg_get_initiator_node_acl().
505 */
506 if (se_nacl) {
507 se_sess->se_node_acl = NULL;
508 target_put_nacl(se_nacl);
509 }
c0add7fd
NB		 510 if (se_sess->sess_cmd_map) {
511 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 512 kvfree(se_sess->sess_cmd_map);
c0add7fd 513 }
c66ac9db
NB		 514 kmem_cache_free(se_sess_cache, se_sess);
515}
516EXPORT_SYMBOL(transport_free_session);
517
518void transport_deregister_session(struct se_session *se_sess)
519{
520 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 521 const struct target_core_fabric_ops *se_tfo;
c66ac9db 522 struct se_node_acl *se_nacl;
e63a8e19 523 unsigned long flags;
21aaa23b 524 bool drop_nacl = false;
c66ac9db 525
6708bb27 526 if (!se_tpg) {
c66ac9db
NB		 527 transport_free_session(se_sess);
528 return;
529 }
01468346 530 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 531
e63a8e19 532 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 533 list_del(&se_sess->sess_list);
534 se_sess->se_tpg = NULL;
535 se_sess->fabric_sess_ptr = NULL;
e63a8e19 536 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 537
538 /*
539 * Determine if we need to do extra work for this initiator node's
540 * struct se_node_acl if it had been previously dynamically generated.
541 */
542 se_nacl = se_sess->se_node_acl;
01468346 543
403edd78 544 mutex_lock(&se_tpg->acl_node_mutex);
01468346
NB		 545 if (se_nacl && se_nacl->dynamic_node_acl) {
546 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
547 list_del(&se_nacl->acl_list);
403edd78 548 drop_nacl = true;
c66ac9db 549 }
c66ac9db 550 }
403edd78 551 mutex_unlock(&se_tpg->acl_node_mutex);
c66ac9db 552
403edd78
NB		 553 if (drop_nacl) {
554 core_tpg_wait_for_nacl_pr_ref(se_nacl);
555 core_free_device_list_for_node(se_nacl, se_tpg);
21aaa23b 556 se_sess->se_node_acl = NULL;
403edd78 557 kfree(se_nacl);
403edd78 558 }
6708bb27 559 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 560 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 561 /*
125d0119 562 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff 563 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
21aaa23b 564 * removal context from within transport_free_session() code.
01468346 565 */
01468346 566
afb999ff 567 transport_free_session(se_sess);
c66ac9db
NB		 568}
569EXPORT_SYMBOL(transport_deregister_session);
570
cf572a96 571static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 572{
42bf829e 573 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 574 unsigned long flags;
575
42bf829e
CH		 576 if (!dev)
577 return;
c66ac9db 578
cf572a96
CH		 579 if (cmd->transport_state & CMD_T_BUSY)
580 return;
c66ac9db 581
cf572a96
CH		 582 spin_lock_irqsave(&dev->execute_task_lock, flags);
583 if (cmd->state_active) {
584 list_del(&cmd->state_list);
cf572a96 585 cmd->state_active = false;
c66ac9db 586 }
cf572a96 587 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 588}
589
862e6389
NB		 590static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
591 bool write_pending)
c66ac9db
NB		 592{
593 unsigned long flags;
594
f7113a47
CH		 595 if (remove_from_lists) {
596 target_remove_from_state_list(cmd);
597
598 /*
599 * Clear struct se_cmd->se_lun before the handoff to FE.
600 */
601 cmd->se_lun = NULL;
602 }
603
febe562c
NB		 604 spin_lock_irqsave(&cmd->t_state_lock, flags);
605 if (write_pending)
606 cmd->t_state = TRANSPORT_WRITE_PENDING;
607
c66ac9db
NB		 608 /*
609 * Determine if frontend context caller is requesting the stopping of
e3d6f909 610 * this command for frontend exceptions.
c66ac9db 611 */
7d680f3b 612 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 613 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
614 __func__, __LINE__, cmd->tag);
c66ac9db 615
a1d8b49a 616 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 617
a95d6511 618 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 619 return 1;
620 }
f7113a47
CH		 621
622 cmd->transport_state &= ~CMD_T_ACTIVE;
623 if (remove_from_lists) {
624 /*
625 * Some fabric modules like tcm_loop can release
626 * their internally allocated I/O reference now and
627 * struct se_cmd now.
628 *
629 * Fabric modules are expected to return '1' here if the
630 * se_cmd being passed is released at this point,
631 * or zero if not being released.
632 */
633 if (cmd->se_tfo->check_stop_free != NULL) {
634 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
635 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 636 }
f7113a47 637 }
c66ac9db 638
a1d8b49a 639 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 640 return 0;
641}
642
643static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
644{
862e6389 645 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 646}
647
648static void transport_lun_remove_cmd(struct se_cmd *cmd)
649{
e3d6f909 650 struct se_lun *lun = cmd->se_lun;
c66ac9db 651
5259a06e 652 if (!lun)
c66ac9db
NB		 653 return;
654
5259a06e
NB		 655 if (cmpxchg(&cmd->lun_ref_active, true, false))
656 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 657}
658
659void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
660{
febe562c
NB		 661 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
662
68259b5a
AL		 663 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
664 transport_lun_remove_cmd(cmd);
131e6abc
NB		 665 /*
666 * Allow the fabric driver to unmap any resources before
667 * releasing the descriptor via TFO->release_cmd()
668 */
669 if (remove)
670 cmd->se_tfo->aborted_task(cmd);
68259b5a 671
c66ac9db
NB		 672 if (transport_cmd_check_stop_to_fabric(cmd))
673 return;
febe562c 674 if (remove && ack_kref)
e6a2573f 675 transport_put_cmd(cmd);
c66ac9db
NB		 676}
677
35e0e757
CH		 678static void target_complete_failure_work(struct work_struct *work)
679{
680 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
681
de103c93
CH		 682 transport_generic_request_failure(cmd,
683 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 684}
685
6138ed2a 686/*
d5829eac
PB		 687 * Used when asking transport to copy Sense Data from the underlying
688 * Linux/SCSI struct scsi_cmnd
6138ed2a 689 */
d5829eac 690static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 691{
6138ed2a 692 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 693
694 WARN_ON(!cmd->se_lun);
695
696 if (!dev)
d5829eac 697 return NULL;
6138ed2a 698
d5829eac
PB		 699 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
700 return NULL;
6138ed2a 701
9c58b7dd 702 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 703
d5829eac 704 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 705 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 706 return cmd->sense_buffer;
6138ed2a
PB		 707}
708
5787cacd 709void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 710{
42bf829e 711 struct se_device *dev = cmd->se_dev;
5787cacd 712 int success = scsi_status == GOOD;
c66ac9db 713 unsigned long flags;
c66ac9db 714
5787cacd
CH		 715 cmd->scsi_status = scsi_status;
716
717
a1d8b49a 718 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 719 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 720
c66ac9db 721 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 722 dev->transport->transport_complete(cmd,
723 cmd->t_data_sg,
724 transport_get_sense_buffer(cmd));
725 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 726 success = 1;
c66ac9db
NB		 727 }
728
3d28934a 729 /*
125d0119 730 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 731 * and transport_wait_for_tasks() will be waiting for completion..
732 */
febe562c 733 if (cmd->transport_state & CMD_T_ABORTED ||
3d28934a
NB		 734 cmd->transport_state & CMD_T_STOP) {
735 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 736 complete_all(&cmd->t_transport_stop_comp);
3d28934a 737 return;
3dca1471 738 } else if (!success) {
35e0e757 739 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 740 } else {
35e0e757 741 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 742 }
35e0e757 743
35e0e757 744 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 745 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 746 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 747
9095adaa 748 if (cmd->se_cmd_flags & SCF_USE_CPUID)
fb3269ba 749 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
9095adaa
QT		 750 else
751 queue_work(target_completion_wq, &cmd->work);
c66ac9db 752}
6bb35e00
CH		 753EXPORT_SYMBOL(target_complete_cmd);
754
2426bd45
RD		 755void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
756{
c1ccbfe0
SR		 757 if (scsi_status != SAM_STAT_GOOD) {
758 return;
759 }
760
761 /*
762 * Calculate new residual count based upon length of SCSI data
763 * transferred.
764 */
765 if (length < cmd->data_length) {
2426bd45
RD		 766 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
767 cmd->residual_count += cmd->data_length - length;
768 } else {
769 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
770 cmd->residual_count = cmd->data_length - length;
771 }
772
773 cmd->data_length = length;
c1ccbfe0
SR		 774 } else if (length > cmd->data_length) {
775 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
776 cmd->residual_count = length - cmd->data_length;
777 } else {
778 cmd->se_cmd_flags &= ~(SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT);
779 cmd->residual_count = 0;
2426bd45
RD		 780 }
781
782 target_complete_cmd(cmd, scsi_status);
783}
784EXPORT_SYMBOL(target_complete_cmd_with_length);
785
cf572a96 786static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 787{
cf572a96
CH		 788 struct se_device *dev = cmd->se_dev;
789 unsigned long flags;
c66ac9db 790
cf572a96
CH		 791 spin_lock_irqsave(&dev->execute_task_lock, flags);
792 if (!cmd->state_active) {
793 list_add_tail(&cmd->state_list, &dev->state_list);
794 cmd->state_active = true;
c66ac9db 795 }
cf572a96 796 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 797}
798
07bde79a 799/*
f147abb4 800 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 801 */
7a6f0a1e
CH		 802static void transport_write_pending_qf(struct se_cmd *cmd);
803static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 804
0fd97ccf 805void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 806{
807 struct se_device *dev = container_of(work, struct se_device,
808 qf_work_queue);
bcac364a 809 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 810 struct se_cmd *cmd, *cmd_tmp;
811
812 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 813 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
814 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 815
bcac364a 816 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 817 list_del(&cmd->se_qf_node);
33940d09 818 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 819
6708bb27 820 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 821 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 822 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 823 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
824 : "UNKNOWN");
f7a5cc0b 825
7a6f0a1e
CH		 826 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
827 transport_write_pending_qf(cmd);
828 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
829 transport_complete_qf(cmd);
07bde79a 830 }
07bde79a
NB		 831}
832
c66ac9db
NB		 833unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
834{
835 switch (cmd->data_direction) {
836 case DMA_NONE:
837 return "NONE";
838 case DMA_FROM_DEVICE:
839 return "READ";
840 case DMA_TO_DEVICE:
841 return "WRITE";
842 case DMA_BIDIRECTIONAL:
843 return "BIDI";
844 default:
845 break;
846 }
847
848 return "UNKNOWN";
849}
850
851void transport_dump_dev_state(
852 struct se_device *dev,
853 char *b,
854 int *bl)
855{
856 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 857 if (dev->export_count)
c66ac9db 858 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 859 else
c66ac9db 860 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 861
5f41a31d 862 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 863 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 864 dev->dev_attrib.block_size,
865 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 866 *bl += sprintf(b + *bl, " ");
867}
868
c66ac9db
NB		 869void transport_dump_vpd_proto_id(
870 struct t10_vpd *vpd,
871 unsigned char *p_buf,
872 int p_buf_len)
873{
874 unsigned char buf[VPD_TMP_BUF_SIZE];
875 int len;
876
877 memset(buf, 0, VPD_TMP_BUF_SIZE);
878 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
879
880 switch (vpd->protocol_identifier) {
881 case 0x00:
882 sprintf(buf+len, "Fibre Channel\n");
883 break;
884 case 0x10:
885 sprintf(buf+len, "Parallel SCSI\n");
886 break;
887 case 0x20:
888 sprintf(buf+len, "SSA\n");
889 break;
890 case 0x30:
891 sprintf(buf+len, "IEEE 1394\n");
892 break;
893 case 0x40:
894 sprintf(buf+len, "SCSI Remote Direct Memory Access"
895 " Protocol\n");
896 break;
897 case 0x50:
898 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
899 break;
900 case 0x60:
901 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
902 break;
903 case 0x70:
904 sprintf(buf+len, "Automation/Drive Interface Transport"
905 " Protocol\n");
906 break;
907 case 0x80:
908 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
909 break;
910 default:
911 sprintf(buf+len, "Unknown 0x%02x\n",
912 vpd->protocol_identifier);
913 break;
914 }
915
916 if (p_buf)
917 strncpy(p_buf, buf, p_buf_len);
918 else
6708bb27 919 pr_debug("%s", buf);
c66ac9db
NB		 920}
921
922void
923transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
924{
925 /*
926 * Check if the Protocol Identifier Valid (PIV) bit is set..
927 *
928 * from spc3r23.pdf section 7.5.1
929 */
930 if (page_83[1] & 0x80) {
931 vpd->protocol_identifier = (page_83[0] & 0xf0);
932 vpd->protocol_identifier_set = 1;
933 transport_dump_vpd_proto_id(vpd, NULL, 0);
934 }
935}
936EXPORT_SYMBOL(transport_set_vpd_proto_id);
937
938int transport_dump_vpd_assoc(
939 struct t10_vpd *vpd,
940 unsigned char *p_buf,
941 int p_buf_len)
942{
943 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 944 int ret = 0;
945 int len;
c66ac9db
NB		 946
947 memset(buf, 0, VPD_TMP_BUF_SIZE);
948 len = sprintf(buf, "T10 VPD Identifier Association: ");
949
950 switch (vpd->association) {
951 case 0x00:
952 sprintf(buf+len, "addressed logical unit\n");
953 break;
954 case 0x10:
955 sprintf(buf+len, "target port\n");
956 break;
957 case 0x20:
958 sprintf(buf+len, "SCSI target device\n");
959 break;
960 default:
961 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 962 ret = -EINVAL;
c66ac9db
NB		 963 break;
964 }
965
966 if (p_buf)
967 strncpy(p_buf, buf, p_buf_len);
968 else
6708bb27 969 pr_debug("%s", buf);
c66ac9db
NB		 970
971 return ret;
972}
973
974int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
975{
976 /*
977 * The VPD identification association..
978 *
979 * from spc3r23.pdf Section 7.6.3.1 Table 297
980 */
981 vpd->association = (page_83[1] & 0x30);
982 return transport_dump_vpd_assoc(vpd, NULL, 0);
983}
984EXPORT_SYMBOL(transport_set_vpd_assoc);
985
986int transport_dump_vpd_ident_type(
987 struct t10_vpd *vpd,
988 unsigned char *p_buf,
989 int p_buf_len)
990{
991 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 992 int ret = 0;
993 int len;
c66ac9db
NB		 994
995 memset(buf, 0, VPD_TMP_BUF_SIZE);
996 len = sprintf(buf, "T10 VPD Identifier Type: ");
997
998 switch (vpd->device_identifier_type) {
999 case 0x00:
1000 sprintf(buf+len, "Vendor specific\n");
1001 break;
1002 case 0x01:
1003 sprintf(buf+len, "T10 Vendor ID based\n");
1004 break;
1005 case 0x02:
1006 sprintf(buf+len, "EUI-64 based\n");
1007 break;
1008 case 0x03:
1009 sprintf(buf+len, "NAA\n");
1010 break;
1011 case 0x04:
1012 sprintf(buf+len, "Relative target port identifier\n");
1013 break;
1014 case 0x08:
1015 sprintf(buf+len, "SCSI name string\n");
1016 break;
1017 default:
1018 sprintf(buf+len, "Unsupported: 0x%02x\n",
1019 vpd->device_identifier_type);
e3d6f909 1020 ret = -EINVAL;
c66ac9db
NB		 1021 break;
1022 }
1023
e3d6f909
AG		 1024 if (p_buf) {
1025 if (p_buf_len < strlen(buf)+1)
1026 return -EINVAL;
c66ac9db 1027 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1028 } else {
6708bb27 1029 pr_debug("%s", buf);
e3d6f909 1030 }
c66ac9db
NB		 1031
1032 return ret;
1033}
1034
1035int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1036{
1037 /*
1038 * The VPD identifier type..
1039 *
1040 * from spc3r23.pdf Section 7.6.3.1 Table 298
1041 */
1042 vpd->device_identifier_type = (page_83[1] & 0x0f);
1043 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1044}
1045EXPORT_SYMBOL(transport_set_vpd_ident_type);
1046
1047int transport_dump_vpd_ident(
1048 struct t10_vpd *vpd,
1049 unsigned char *p_buf,
1050 int p_buf_len)
1051{
1052 unsigned char buf[VPD_TMP_BUF_SIZE];
1053 int ret = 0;
1054
1055 memset(buf, 0, VPD_TMP_BUF_SIZE);
1056
1057 switch (vpd->device_identifier_code_set) {
1058 case 0x01: /* Binary */
703d641d
DC		 1059 snprintf(buf, sizeof(buf),
1060 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1061 &vpd->device_identifier[0]);
1062 break;
1063 case 0x02: /* ASCII */
703d641d
DC		 1064 snprintf(buf, sizeof(buf),
1065 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1066 &vpd->device_identifier[0]);
1067 break;
1068 case 0x03: /* UTF-8 */
703d641d
DC		 1069 snprintf(buf, sizeof(buf),
1070 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1071 &vpd->device_identifier[0]);
1072 break;
1073 default:
1074 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1075 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1076 ret = -EINVAL;
c66ac9db
NB		 1077 break;
1078 }
1079
1080 if (p_buf)
1081 strncpy(p_buf, buf, p_buf_len);
1082 else
6708bb27 1083 pr_debug("%s", buf);
c66ac9db
NB		 1084
1085 return ret;
1086}
1087
1088int
1089transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1090{
1091 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1092 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1093
1094 /*
1095 * The VPD Code Set (encoding)
1096 *
1097 * from spc3r23.pdf Section 7.6.3.1 Table 296
1098 */
1099 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1100 switch (vpd->device_identifier_code_set) {
1101 case 0x01: /* Binary */
1102 vpd->device_identifier[j++] =
1103 hex_str[vpd->device_identifier_type];
1104 while (i < (4 + page_83[3])) {
1105 vpd->device_identifier[j++] =
1106 hex_str[(page_83[i] & 0xf0) >> 4];
1107 vpd->device_identifier[j++] =
1108 hex_str[page_83[i] & 0x0f];
1109 i++;
1110 }
1111 break;
1112 case 0x02: /* ASCII */
1113 case 0x03: /* UTF-8 */
1114 while (i < (4 + page_83[3]))
1115 vpd->device_identifier[j++] = page_83[i++];
1116 break;
1117 default:
1118 break;
1119 }
1120
1121 return transport_dump_vpd_ident(vpd, NULL, 0);
1122}
1123EXPORT_SYMBOL(transport_set_vpd_ident);
1124
8f9b5654
NB		 1125static sense_reason_t
1126target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1127 unsigned int size)
1128{
1129 u32 mtl;
1130
1131 if (!cmd->se_tfo->max_data_sg_nents)
1132 return TCM_NO_SENSE;
1133 /*
1134 * Check if fabric enforced maximum SGL entries per I/O descriptor
1135 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1136 * residual_count and reduce original cmd->data_length to maximum
1137 * length based on single PAGE_SIZE entry scatter-lists.
1138 */
1139 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1140 if (cmd->data_length > mtl) {
1141 /*
1142 * If an existing CDB overflow is present, calculate new residual
1143 * based on CDB size minus fabric maximum transfer length.
1144 *
1145 * If an existing CDB underflow is present, calculate new residual
1146 * based on original cmd->data_length minus fabric maximum transfer
1147 * length.
1148 *
1149 * Otherwise, set the underflow residual based on cmd->data_length
1150 * minus fabric maximum transfer length.
1151 */
1152 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1153 cmd->residual_count = (size - mtl);
1154 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1155 u32 orig_dl = size + cmd->residual_count;
1156 cmd->residual_count = (orig_dl - mtl);
1157 } else {
1158 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1159 cmd->residual_count = (cmd->data_length - mtl);
1160 }
1161 cmd->data_length = mtl;
1162 /*
1163 * Reset sbc_check_prot() calculated protection payload
1164 * length based upon the new smaller MTL.
1165 */
1166 if (cmd->prot_length) {
1167 u32 sectors = (mtl / dev->dev_attrib.block_size);
1168 cmd->prot_length = dev->prot_length * sectors;
1169 }
1170 }
1171 return TCM_NO_SENSE;
1172}
1173
de103c93
CH		 1174sense_reason_t
1175target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1176{
1177 struct se_device *dev = cmd->se_dev;
1178
1179 if (cmd->unknown_data_length) {
1180 cmd->data_length = size;
1181 } else if (size != cmd->data_length) {
1182 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1183 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1184 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1185 cmd->data_length, size, cmd->t_task_cdb[0]);
1186
c72c5250
RD		 1187 if (cmd->data_direction == DMA_TO_DEVICE &&
1188 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1189 pr_err("Rejecting underflow/overflow WRITE data\n");
de103c93 1190 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1191 }
1192 /*
1193 * Reject READ_* or WRITE_* with overflow/underflow for
1194 * type SCF_SCSI_DATA_CDB.
1195 */
0fd97ccf 1196 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1197 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1198 " CDB on non 512-byte sector setup subsystem"
1199 " plugin: %s\n", dev->transport->name);
1200 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1201 return TCM_INVALID_CDB_FIELD;
9b3b8041 1202 }
4c054ba6
NB		 1203 /*
1204 * For the overflow case keep the existing fabric provided
1205 * ->data_length. Otherwise for the underflow case, reset
1206 * ->data_length to the smaller SCSI expected data transfer
1207 * length.
1208 */
9b3b8041
CH		 1209 if (size > cmd->data_length) {
1210 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1211 cmd->residual_count = (size - cmd->data_length);
1212 } else {
1213 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1214 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1215 cmd->data_length = size;
9b3b8041 1216 }
9b3b8041
CH		 1217 }
1218
8f9b5654 1219 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1220
9b3b8041
CH		 1221}
1222
c66ac9db
NB		 1223/*
1224 * Used by fabric modules containing a local struct se_cmd within their
1225 * fabric dependent per I/O descriptor.
649ee054
BVA		 1226 *
1227 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1228 */
1229void transport_init_se_cmd(
1230 struct se_cmd *cmd,
9ac8928e 1231 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1232 struct se_session *se_sess,
1233 u32 data_length,
1234 int data_direction,
1235 int task_attr,
1236 unsigned char *sense_buffer)
1237{
5951146d 1238 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1239 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1240 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1241 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1242 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1243 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1244 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1245 kref_init(&cmd->cmd_kref);
7d680f3b 1246 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1247
1248 cmd->se_tfo = tfo;
1249 cmd->se_sess = se_sess;
1250 cmd->data_length = data_length;
1251 cmd->data_direction = data_direction;
1252 cmd->sam_task_attr = task_attr;
1253 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1254
1255 cmd->state_active = false;
c66ac9db
NB		 1256}
1257EXPORT_SYMBOL(transport_init_se_cmd);
1258
de103c93
CH		 1259static sense_reason_t
1260transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1261{
019c4ca6
CH		 1262 struct se_device *dev = cmd->se_dev;
1263
c66ac9db
NB		 1264 /*
1265 * Check if SAM Task Attribute emulation is enabled for this
1266 * struct se_device storage object
1267 */
a3541703 1268 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1269 return 0;
1270
68d81f40 1271 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1272 pr_debug("SAM Task Attribute ACA"
c66ac9db 1273 " emulation is not supported\n");
de103c93 1274 return TCM_INVALID_CDB_FIELD;
c66ac9db 1275 }
9c31820b 1276
c66ac9db
NB		 1277 return 0;
1278}
1279
de103c93
CH		 1280sense_reason_t
1281target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1282{
0fd97ccf 1283 struct se_device *dev = cmd->se_dev;
de103c93 1284 sense_reason_t ret;
c66ac9db 1285
c66ac9db
NB		 1286 /*
1287 * Ensure that the received CDB is less than the max (252 + 8) bytes
1288 * for VARIABLE_LENGTH_CMD
1289 */
1290 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1291 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1292 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1293 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1294 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1295 }
1296 /*
1297 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1298 * allocate the additional extended CDB buffer now.. Otherwise
1299 * setup the pointer from __t_task_cdb to t_task_cdb.
1300 */
a1d8b49a
AG		 1301 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1302 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1303 GFP_KERNEL);
6708bb27
AG		 1304 if (!cmd->t_task_cdb) {
1305 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1306 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1307 scsi_command_size(cdb),
a1d8b49a 1308 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1309 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1310 }
1311 } else
a1d8b49a 1312 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1313 /*
a1d8b49a 1314 * Copy the original CDB into cmd->
c66ac9db 1315 */
a1d8b49a 1316 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1317
e5c0d6ad
RD		 1318 trace_target_sequencer_start(cmd);
1319
0fd97ccf 1320 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1321 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1322 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1323 cmd->se_tfo->get_fabric_name(),
1324 cmd->se_sess->se_node_acl->initiatorname,
1325 cmd->t_task_cdb[0]);
de103c93
CH		 1326 if (ret)
1327 return ret;
1328
1329 ret = transport_check_alloc_task_attr(cmd);
1330 if (ret)
c66ac9db 1331 return ret;
cb4f4d3c 1332
cb4f4d3c 1333 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1334 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1335 return 0;
1336}
a12f41f8 1337EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1338
695434e1
NB		 1339/*
1340 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1341 * May only be used from process context.
695434e1
NB		 1342 */
1343int transport_handle_cdb_direct(
1344 struct se_cmd *cmd)
1345{
de103c93 1346 sense_reason_t ret;
dd8ae59d 1347
695434e1
NB		 1348 if (!cmd->se_lun) {
1349 dump_stack();
6708bb27 1350 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1351 return -EINVAL;
1352 }
1353 if (in_interrupt()) {
1354 dump_stack();
6708bb27 1355 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1356 " from interrupt context\n");
1357 return -EINVAL;
1358 }
dd8ae59d 1359 /*
af877292
CH		 1360 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1361 * outstanding descriptors are handled correctly during shutdown via
1362 * transport_wait_for_tasks()
dd8ae59d
NB		 1363 *
1364 * Also, we don't take cmd->t_state_lock here as we only expect
1365 * this to be called for initial descriptor submission.
1366 */
1367 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1368 cmd->transport_state |= CMD_T_ACTIVE;
1369
dd8ae59d
NB		 1370 /*
1371 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1372 * so follow TRANSPORT_NEW_CMD processing thread context usage
1373 * and call transport_generic_request_failure() if necessary..
1374 */
1375 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1376 if (ret)
1377 transport_generic_request_failure(cmd, ret);
dd8ae59d 1378 return 0;
695434e1
NB		 1379}
1380EXPORT_SYMBOL(transport_handle_cdb_direct);
1381
c5ff8d6b 1382sense_reason_t
de103c93
CH		 1383transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1384 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1385{
1386 if (!sgl || !sgl_count)
1387 return 0;
1388
1389 /*
1390 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1391 * scatterlists already have been set to follow what the fabric
1392 * passes for the original expected data transfer length.
1393 */
1394 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1395 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1396 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1397 return TCM_INVALID_CDB_FIELD;
1398 }
1399
1400 cmd->t_data_sg = sgl;
1401 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1402 cmd->t_bidi_data_sg = sgl_bidi;
1403 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1404
de103c93
CH		 1405 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1406 return 0;
1407}
1408
a026757f
NB		 1409/*
1410 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1411 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1412 *
1413 * @se_cmd: command descriptor to submit
1414 * @se_sess: associated se_sess for endpoint
1415 * @cdb: pointer to SCSI CDB
1416 * @sense: pointer to SCSI sense buffer
1417 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1418 * @data_length: fabric expected data transfer length
1419 * @task_addr: SAM task attribute
1420 * @data_dir: DMA data direction
1421 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1422 * @sgl: struct scatterlist memory for unidirectional mapping
1423 * @sgl_count: scatterlist count for unidirectional mapping
1424 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1425 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1426 * @sgl_prot: struct scatterlist memory protection information
1427 * @sgl_prot_count: scatterlist count for protection information
a6360785 1428 *
649ee054
BVA		 1429 * Task tags are supported if the caller has set @se_cmd->tag.
1430 *
d6dfc868
RD		 1431 * Returns non zero to signal active I/O shutdown failure. All other
1432 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1433 * but still return zero here.
1434 *
a6360785
NB		 1435 * This may only be called from process context, and also currently
1436 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1437 */
1438int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1439 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1440 u32 data_length, int task_attr, int data_dir, int flags,
1441 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1442 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1443 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1444{
1445 struct se_portal_group *se_tpg;
de103c93
CH		 1446 sense_reason_t rc;
1447 int ret;
a6360785
NB		 1448
1449 se_tpg = se_sess->se_tpg;
1450 BUG_ON(!se_tpg);
1451 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1452 BUG_ON(in_interrupt());
1453 /*
1454 * Initialize se_cmd for target operation. From this point
1455 * exceptions are handled by sending exception status via
1456 * target_core_fabric_ops->queue_status() callback
1457 */
1458 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1459 data_length, data_dir, task_attr, sense);
9095adaa
QT		 1460
1461 if (flags & TARGET_SCF_USE_CPUID)
1462 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1463 else
1464 se_cmd->cpuid = WORK_CPU_UNBOUND;
1465
b0d79946
SAS		 1466 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1467 se_cmd->unknown_data_length = 1;
a6360785
NB		 1468 /*
1469 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1470 * se_sess->sess_cmd_list. A second kref_get here is necessary
1471 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1472 * kref_put() to happen during fabric packet acknowledgement.
1473 */
afc16604 1474 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1475 if (ret)
1476 return ret;
a6360785
NB		 1477 /*
1478 * Signal bidirectional data payloads to target-core
1479 */
1480 if (flags & TARGET_SCF_BIDI_OP)
1481 se_cmd->se_cmd_flags |= SCF_BIDI;
1482 /*
1483 * Locate se_lun pointer and attach it to struct se_cmd
1484 */
de103c93
CH		 1485 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1486 if (rc) {
1487 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1488 target_put_sess_cmd(se_cmd);
d6dfc868 1489 return 0;
735703ca 1490 }
b5b8e298
SG		 1491
1492 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1493 if (rc != 0) {
1494 transport_generic_request_failure(se_cmd, rc);
1495 return 0;
1496 }
1497
def2b339
NB		 1498 /*
1499 * Save pointers for SGLs containing protection information,
1500 * if present.
1501 */
1502 if (sgl_prot_count) {
1503 se_cmd->t_prot_sg = sgl_prot;
1504 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1505 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1506 }
d6e0175c 1507
a026757f
NB		 1508 /*
1509 * When a non zero sgl_count has been passed perform SGL passthrough
1510 * mapping for pre-allocated fabric memory instead of having target
1511 * core perform an internal SGL allocation..
1512 */
1513 if (sgl_count != 0) {
1514 BUG_ON(!sgl);
1515
944981c7
NB		 1516 /*
1517 * A work-around for tcm_loop as some userspace code via
1518 * scsi-generic do not memset their associated read buffers,
1519 * so go ahead and do that here for type non-data CDBs. Also
1520 * note that this is currently guaranteed to be a single SGL
1521 * for this case by target core in target_setup_cmd_from_cdb()
1522 * -> transport_generic_cmd_sequencer().
1523 */
1524 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1525 se_cmd->data_direction == DMA_FROM_DEVICE) {
1526 unsigned char *buf = NULL;
1527
1528 if (sgl)
1529 buf = kmap(sg_page(sgl)) + sgl->offset;
1530
1531 if (buf) {
1532 memset(buf, 0, sgl->length);
1533 kunmap(sg_page(sgl));
1534 }
1535 }
1536
a026757f
NB		 1537 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1538 sgl_bidi, sgl_bidi_count);
1539 if (rc != 0) {
de103c93 1540 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1541 return 0;
1542 }
1543 }
def2b339 1544
11e319ed
AG		 1545 /*
1546 * Check if we need to delay processing because of ALUA
1547 * Active/NonOptimized primary access state..
1548 */
1549 core_alua_check_nonop_delay(se_cmd);
1550
a6360785 1551 transport_handle_cdb_direct(se_cmd);
d6dfc868 1552 return 0;
a6360785 1553}
a026757f
NB		 1554EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1555
1556/*
1557 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1558 *
1559 * @se_cmd: command descriptor to submit
1560 * @se_sess: associated se_sess for endpoint
1561 * @cdb: pointer to SCSI CDB
1562 * @sense: pointer to SCSI sense buffer
1563 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1564 * @data_length: fabric expected data transfer length
1565 * @task_addr: SAM task attribute
1566 * @data_dir: DMA data direction
1567 * @flags: flags for command submission from target_sc_flags_tables
1568 *
649ee054
BVA		 1569 * Task tags are supported if the caller has set @se_cmd->tag.
1570 *
a026757f
NB		 1571 * Returns non zero to signal active I/O shutdown failure. All other
1572 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1573 * but still return zero here.
1574 *
1575 * This may only be called from process context, and also currently
1576 * assumes internal allocation of fabric payload buffer by target-core.
1577 *
1578 * It also assumes interal target core SGL memory allocation.
1579 */
1580int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1581 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1582 u32 data_length, int task_attr, int data_dir, int flags)
1583{
1584 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1585 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1586 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1587}
a6360785
NB		 1588EXPORT_SYMBOL(target_submit_cmd);
1589
9f0d05c2
NB		 1590static void target_complete_tmr_failure(struct work_struct *work)
1591{
1592 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1593
1594 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1595 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1596
1597 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1598}
1599
ea98d7f9
AG		 1600/**
1601 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1602 * for TMR CDBs
1603 *
1604 * @se_cmd: command descriptor to submit
1605 * @se_sess: associated se_sess for endpoint
1606 * @sense: pointer to SCSI sense buffer
1607 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1608 * @fabric_context: fabric context for TMR req
1609 * @tm_type: Type of TM request
c0974f89
NB		 1610 * @gfp: gfp type for caller
1611 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1612 * @flags: submit cmd flags
ea98d7f9
AG		 1613 *
1614 * Callable from all contexts.
1615 **/
1616
c7042cae 1617int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1618 unsigned char *sense, u64 unpacked_lun,
c0974f89 1619 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1620 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1621{
1622 struct se_portal_group *se_tpg;
1623 int ret;
1624
1625 se_tpg = se_sess->se_tpg;
1626 BUG_ON(!se_tpg);
1627
1628 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1629 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1630 /*
1631 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1632 * allocation failure.
1633 */
c0974f89 1634 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1635 if (ret < 0)
1636 return -ENOMEM;
ea98d7f9 1637
c0974f89
NB		 1638 if (tm_type == TMR_ABORT_TASK)
1639 se_cmd->se_tmr_req->ref_task_tag = tag;
1640
ea98d7f9 1641 /* See target_submit_cmd for commentary */
afc16604 1642 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1643 if (ret) {
1644 core_tmr_release_req(se_cmd->se_tmr_req);
1645 return ret;
1646 }
ea98d7f9 1647
ea98d7f9
AG		 1648 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1649 if (ret) {
9f0d05c2
NB		 1650 /*
1651 * For callback during failure handling, push this work off
1652 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1653 */
1654 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1655 schedule_work(&se_cmd->work);
c7042cae 1656 return 0;
ea98d7f9
AG		 1657 }
1658 transport_generic_handle_tmr(se_cmd);
c7042cae 1659 return 0;
ea98d7f9
AG		 1660}
1661EXPORT_SYMBOL(target_submit_tmr);
1662
c66ac9db
NB		 1663/*
1664 * Handle SAM-esque emulation for generic transport request failures.
1665 */
de103c93
CH		 1666void transport_generic_request_failure(struct se_cmd *cmd,
1667 sense_reason_t sense_reason)
c66ac9db 1668{
057085e5 1669 int ret = 0, post_ret = 0;
07bde79a 1670
649ee054
BVA		 1671 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1672 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1673 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1674 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1675 cmd->t_state, sense_reason);
d43d6aea 1676 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1677 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1678 (cmd->transport_state & CMD_T_STOP) != 0,
1679 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1680
c66ac9db
NB		 1681 /*
1682 * For SAM Task Attribute emulation for failed struct se_cmd
1683 */
019c4ca6 1684 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1685 /*
1686 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1687 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1688 */
1689 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1690 cmd->transport_complete_callback)
057085e5 1691 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1692
de103c93 1693 switch (sense_reason) {
03e98c9e
NB		 1694 case TCM_NON_EXISTENT_LUN:
1695 case TCM_UNSUPPORTED_SCSI_OPCODE:
1696 case TCM_INVALID_CDB_FIELD:
1697 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1698 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1699 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1700 case TCM_UNKNOWN_MODE_PAGE:
1701 case TCM_WRITE_PROTECTED:
e2397c70 1702 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1703 case TCM_CHECK_CONDITION_ABORT_CMD:
1704 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1705 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1706 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1707 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1708 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1709 break;
de103c93
CH		 1710 case TCM_OUT_OF_RESOURCES:
1711 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1712 break;
03e98c9e 1713 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1714 /*
1715 * No SENSE Data payload for this case, set SCSI Status
1716 * and queue the response to $FABRIC_MOD.
1717 *
1718 * Uses linux/include/scsi/scsi.h SAM status codes defs
1719 */
1720 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1721 /*
1722 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1723 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1724 * CONFLICT STATUS.
1725 *
1726 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1727 */
e3d6f909 1728 if (cmd->se_sess &&
c51c8e7b
HR		 1729 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1730 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1731 cmd->orig_fe_lun, 0x2C,
1732 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1733 }
e5c0d6ad 1734 trace_target_cmd_complete(cmd);
c51c8e7b 1735 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1736 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1737 goto queue_full;
c66ac9db 1738 goto check_stop;
c66ac9db 1739 default:
6708bb27 1740 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1741 cmd->t_task_cdb[0], sense_reason);
1742 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1743 break;
1744 }
f3146437 1745
de103c93 1746 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1747 if (ret == -EAGAIN || ret == -ENOMEM)
1748 goto queue_full;
07bde79a 1749
c66ac9db
NB		 1750check_stop:
1751 transport_lun_remove_cmd(cmd);
06b967e4 1752 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1753 return;
1754
1755queue_full:
e057f533
CH		 1756 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1757 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1758}
2fbff127 1759EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1760
dff0ca9e 1761void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
c66ac9db 1762{
de103c93 1763 sense_reason_t ret;
5f41a31d 1764
dff0ca9e
NB		 1765 if (!cmd->execute_cmd) {
1766 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1767 goto err;
1768 }
1769 if (do_checks) {
1770 /*
1771 * Check for an existing UNIT ATTENTION condition after
1772 * target_handle_task_attr() has done SAM task attr
1773 * checking, and possibly have already defered execution
1774 * out to target_restart_delayed_cmds() context.
1775 */
1776 ret = target_scsi3_ua_check(cmd);
1777 if (ret)
1778 goto err;
1779
1780 ret = target_alua_state_check(cmd);
1781 if (ret)
1782 goto err;
5f41a31d 1783
dff0ca9e
NB		 1784 ret = target_check_reservation(cmd);
1785 if (ret) {
1786 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1787 goto err;
de103c93 1788 }
5f41a31d 1789 }
dff0ca9e
NB		 1790
1791 ret = cmd->execute_cmd(cmd);
1792 if (!ret)
1793 return;
1794err:
1795 spin_lock_irq(&cmd->t_state_lock);
1796 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1797 spin_unlock_irq(&cmd->t_state_lock);
1798
1799 transport_generic_request_failure(cmd, ret);
5f41a31d
CH		 1800}
1801
aa58b531
NB		 1802static int target_write_prot_action(struct se_cmd *cmd)
1803{
5132d1e6 1804 u32 sectors;
aa58b531
NB		 1805 /*
1806 * Perform WRITE_INSERT of PI using software emulation when backend
1807 * device has PI enabled, if the transport has not already generated
1808 * PI using hardware WRITE_INSERT offload.
1809 */
1810 switch (cmd->prot_op) {
1811 case TARGET_PROT_DOUT_INSERT:
1812 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1813 sbc_dif_generate(cmd);
1814 break;
5132d1e6
NB		 1815 case TARGET_PROT_DOUT_STRIP:
1816 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1817 break;
1818
1819 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1820 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1821 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1822 if (unlikely(cmd->pi_err)) {
1823 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1824 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1825 spin_unlock_irq(&cmd->t_state_lock);
1826 transport_generic_request_failure(cmd, cmd->pi_err);
1827 return -1;
1828 }
1829 break;
aa58b531
NB		 1830 default:
1831 break;
1832 }
1833
1834 return 0;
1835}
1836
019c4ca6 1837static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1838{
1839 struct se_device *dev = cmd->se_dev;
1840
a3541703 1841 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1842 return false;
5f41a31d 1843
410c29df
NB		 1844 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1845
c66ac9db 1846 /*
25985edc 1847 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1848 * to allow the passed struct se_cmd list of tasks to the front of the list.
1849 */
5f41a31d 1850 switch (cmd->sam_task_attr) {
68d81f40 1851 case TCM_HEAD_TAG:
9c31820b
RD		 1852 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1853 cmd->t_task_cdb[0]);
019c4ca6 1854 return false;
68d81f40 1855 case TCM_ORDERED_TAG:
33940d09 1856 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1857
9c31820b
RD		 1858 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1859 cmd->t_task_cdb[0]);
5f41a31d 1860
c66ac9db 1861 /*
5f41a31d
CH		 1862 * Execute an ORDERED command if no other older commands
1863 * exist that need to be completed first.
c66ac9db 1864 */
5f41a31d 1865 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1866 return false;
5f41a31d
CH		 1867 break;
1868 default:
c66ac9db
NB		 1869 /*
1870 * For SIMPLE and UNTAGGED Task Attribute commands
1871 */
33940d09 1872 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1873 break;
c66ac9db 1874 }
5f41a31d 1875
019c4ca6
CH		 1876 if (atomic_read(&dev->dev_ordered_sync) == 0)
1877 return false;
c66ac9db 1878
019c4ca6
CH		 1879 spin_lock(&dev->delayed_cmd_lock);
1880 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1881 spin_unlock(&dev->delayed_cmd_lock);
1882
9c31820b
RD		 1883 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1884 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1885 return true;
1886}
1887
310d3d31
NB		 1888static int __transport_check_aborted_status(struct se_cmd *, int);
1889
019c4ca6
CH		 1890void target_execute_cmd(struct se_cmd *cmd)
1891{
019c4ca6
CH		 1892 /*
1893 * Determine if frontend context caller is requesting the stopping of
1894 * this command for frontend exceptions.
310d3d31
NB		 1895 *
1896 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1897 */
4a9a6c8d 1898 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1899 if (__transport_check_aborted_status(cmd, 1)) {
1900 spin_unlock_irq(&cmd->t_state_lock);
1901 return;
1902 }
019c4ca6 1903 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1904 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1905 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1906
1907 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1908 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1909 return;
1910 }
1911
1912 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1913 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1914 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1915
1916 if (target_write_prot_action(cmd))
1917 return;
019c4ca6 1918
1a398b97
NB		 1919 if (target_handle_task_attr(cmd)) {
1920 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1921 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1922 spin_unlock_irq(&cmd->t_state_lock);
1923 return;
1924 }
1925
dff0ca9e 1926 __target_execute_cmd(cmd, true);
c66ac9db 1927}
70baf0ab 1928EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1929
5f41a31d
CH		 1930/*
1931 * Process all commands up to the last received ORDERED task attribute which
1932 * requires another blocking boundary
1933 */
1934static void target_restart_delayed_cmds(struct se_device *dev)
1935{
1936 for (;;) {
1937 struct se_cmd *cmd;
1938
1939 spin_lock(&dev->delayed_cmd_lock);
1940 if (list_empty(&dev->delayed_cmd_list)) {
1941 spin_unlock(&dev->delayed_cmd_lock);
1942 break;
1943 }
1944
1945 cmd = list_entry(dev->delayed_cmd_list.next,
1946 struct se_cmd, se_delayed_node);
1947 list_del(&cmd->se_delayed_node);
1948 spin_unlock(&dev->delayed_cmd_lock);
1949
dff0ca9e 1950 __target_execute_cmd(cmd, true);
5f41a31d 1951
68d81f40 1952 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1953 break;
1954 }
1955}
1956
c66ac9db 1957/*
35e0e757 1958 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1959 * and ordered cmds need to have their tasks added to the execution queue.
1960 */
1961static void transport_complete_task_attr(struct se_cmd *cmd)
1962{
5951146d 1963 struct se_device *dev = cmd->se_dev;
c66ac9db 1964
a3541703 1965 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1966 return;
1967
410c29df
NB		 1968 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
1969 goto restart;
1970
68d81f40 1971 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1972 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1973 dev->dev_cur_ordered_id++;
9c31820b
RD		 1974 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1975 dev->dev_cur_ordered_id);
68d81f40 1976 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1977 dev->dev_cur_ordered_id++;
9c31820b
RD		 1978 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1979 dev->dev_cur_ordered_id);
68d81f40 1980 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1981 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1982
1983 dev->dev_cur_ordered_id++;
9c31820b
RD		 1984 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1985 dev->dev_cur_ordered_id);
c66ac9db 1986 }
410c29df 1987restart:
5f41a31d 1988 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1989}
1990
e057f533 1991static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1992{
1993 int ret = 0;
1994
019c4ca6 1995 transport_complete_task_attr(cmd);
e057f533
CH		 1996
1997 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1998 trace_target_cmd_complete(cmd);
e057f533 1999 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 2000 goto out;
e057f533 2001 }
07bde79a
NB		 2002
2003 switch (cmd->data_direction) {
2004 case DMA_FROM_DEVICE:
4347ab5a
NB		 2005 if (cmd->scsi_status)
2006 goto queue_status;
2007
e5c0d6ad 2008 trace_target_cmd_complete(cmd);
07bde79a
NB		 2009 ret = cmd->se_tfo->queue_data_in(cmd);
2010 break;
2011 case DMA_TO_DEVICE:
64577407 2012 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 2013 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 2014 break;
07bde79a
NB		 2015 }
2016 /* Fall through for DMA_TO_DEVICE */
2017 case DMA_NONE:
4347ab5a 2018queue_status:
e5c0d6ad 2019 trace_target_cmd_complete(cmd);
07bde79a
NB		 2020 ret = cmd->se_tfo->queue_status(cmd);
2021 break;
2022 default:
2023 break;
2024 }
2025
e057f533
CH		 2026out:
2027 if (ret < 0) {
2028 transport_handle_queue_full(cmd, cmd->se_dev);
2029 return;
2030 }
2031 transport_lun_remove_cmd(cmd);
2032 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2033}
2034
2035static void transport_handle_queue_full(
2036 struct se_cmd *cmd,
e057f533 2037 struct se_device *dev)
07bde79a
NB		 2038{
2039 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2040 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2041 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2042 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2043
2044 schedule_work(&cmd->se_dev->qf_work_queue);
2045}
2046
fdeab852 2047static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2048{
fdeab852
NB		 2049 switch (cmd->prot_op) {
2050 case TARGET_PROT_DIN_STRIP:
2051 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2052 u32 sectors = cmd->data_length >>
2053 ilog2(cmd->se_dev->dev_attrib.block_size);
2054
2055 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2056 sectors, 0, cmd->t_prot_sg,
2057 0);
2058 if (cmd->pi_err)
fdeab852 2059 return true;
bc005869 2060 }
fdeab852 2061 break;
72c03850
NB		 2062 case TARGET_PROT_DIN_INSERT:
2063 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2064 break;
2065
2066 sbc_dif_generate(cmd);
2067 break;
fdeab852
NB		 2068 default:
2069 break;
bc005869
NB		 2070 }
2071
2072 return false;
2073}
2074
35e0e757 2075static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2076{
35e0e757 2077 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2078 int ret;
35e0e757 2079
c66ac9db
NB		 2080 /*
2081 * Check if we need to move delayed/dormant tasks from cmds on the
2082 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2083 * Attribute.
2084 */
019c4ca6
CH		 2085 transport_complete_task_attr(cmd);
2086
07bde79a
NB		 2087 /*
2088 * Check to schedule QUEUE_FULL work, or execute an existing
2089 * cmd->transport_qf_callback()
2090 */
2091 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2092 schedule_work(&cmd->se_dev->qf_work_queue);
2093
c66ac9db 2094 /*
d5829eac 2095 * Check if we need to send a sense buffer from
c66ac9db
NB		 2096 * the struct se_cmd in question.
2097 */
2098 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2099 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2100 ret = transport_send_check_condition_and_sense(
2101 cmd, 0, 1);
2102 if (ret == -EAGAIN || ret == -ENOMEM)
2103 goto queue_full;
2104
2105 transport_lun_remove_cmd(cmd);
2106 transport_cmd_check_stop_to_fabric(cmd);
2107 return;
c66ac9db
NB		 2108 }
2109 /*
25985edc 2110 * Check for a callback, used by amongst other things
a6b0133c 2111 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2112 */
a6b0133c
NB		 2113 if (cmd->transport_complete_callback) {
2114 sense_reason_t rc;
057085e5
NB		 2115 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2116 bool zero_dl = !(cmd->data_length);
2117 int post_ret = 0;
a6b0133c 2118
057085e5
NB		 2119 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2120 if (!rc && !post_ret) {
2121 if (caw && zero_dl)
c8e63985
NB		 2122 goto queue_rsp;
2123
a6b0133c 2124 return;
a2890087
NB		 2125 } else if (rc) {
2126 ret = transport_send_check_condition_and_sense(cmd,
2127 rc, 0);
2128 if (ret == -EAGAIN || ret == -ENOMEM)
2129 goto queue_full;
a6b0133c 2130
a2890087
NB		 2131 transport_lun_remove_cmd(cmd);
2132 transport_cmd_check_stop_to_fabric(cmd);
2133 return;
2134 }
a6b0133c 2135 }
c66ac9db 2136
c8e63985 2137queue_rsp:
c66ac9db
NB		 2138 switch (cmd->data_direction) {
2139 case DMA_FROM_DEVICE:
4347ab5a
NB		 2140 if (cmd->scsi_status)
2141 goto queue_status;
2142
4cc987ea
NB		 2143 atomic_long_add(cmd->data_length,
2144 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2145 /*
2146 * Perform READ_STRIP of PI using software emulation when
2147 * backend had PI enabled, if the transport will not be
2148 * performing hardware READ_STRIP offload.
2149 */
fdeab852 2150 if (target_read_prot_action(cmd)) {
bc005869
NB		 2151 ret = transport_send_check_condition_and_sense(cmd,
2152 cmd->pi_err, 0);
2153 if (ret == -EAGAIN || ret == -ENOMEM)
2154 goto queue_full;
2155
2156 transport_lun_remove_cmd(cmd);
2157 transport_cmd_check_stop_to_fabric(cmd);
2158 return;
2159 }
c66ac9db 2160
e5c0d6ad 2161 trace_target_cmd_complete(cmd);
07bde79a 2162 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2163 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2164 goto queue_full;
c66ac9db
NB		 2165 break;
2166 case DMA_TO_DEVICE:
4cc987ea
NB		 2167 atomic_long_add(cmd->data_length,
2168 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2169 /*
2170 * Check if we need to send READ payload for BIDI-COMMAND
2171 */
64577407 2172 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2173 atomic_long_add(cmd->data_length,
2174 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2175 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2176 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2177 goto queue_full;
c66ac9db
NB		 2178 break;
2179 }
2180 /* Fall through for DMA_TO_DEVICE */
2181 case DMA_NONE:
4347ab5a 2182queue_status:
e5c0d6ad 2183 trace_target_cmd_complete(cmd);
07bde79a 2184 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2185 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2186 goto queue_full;
c66ac9db
NB		 2187 break;
2188 default:
2189 break;
2190 }
2191
2192 transport_lun_remove_cmd(cmd);
2193 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2194 return;
2195
2196queue_full:
6708bb27 2197 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2198 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2199 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2200 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2201}
2202
e64aa657 2203void target_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2204{
ec98f782 2205 struct scatterlist *sg;
ec98f782 2206 int count;
c66ac9db 2207
6708bb27
AG		 2208 for_each_sg(sgl, sg, nents, count)
2209 __free_page(sg_page(sg));
c66ac9db 2210
6708bb27
AG		 2211 kfree(sgl);
2212}
e64aa657 2213EXPORT_SYMBOL(target_free_sgl);
c66ac9db 2214
47e459e6
NB		 2215static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2216{
2217 /*
2218 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2219 * emulation, and free + reset pointers if necessary..
2220 */
2221 if (!cmd->t_data_sg_orig)
2222 return;
2223
2224 kfree(cmd->t_data_sg);
2225 cmd->t_data_sg = cmd->t_data_sg_orig;
2226 cmd->t_data_sg_orig = NULL;
2227 cmd->t_data_nents = cmd->t_data_nents_orig;
2228 cmd->t_data_nents_orig = 0;
2229}
2230
6708bb27
AG		 2231static inline void transport_free_pages(struct se_cmd *cmd)
2232{
5835812f 2233 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
e64aa657 2234 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
5835812f
AM		 2235 cmd->t_prot_sg = NULL;
2236 cmd->t_prot_nents = 0;
2237 }
2238
47e459e6 2239 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2240 /*
2241 * Release special case READ buffer payload required for
2242 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2243 */
2244 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
e64aa657 2245 target_free_sgl(cmd->t_bidi_data_sg,
c8e63985
NB		 2246 cmd->t_bidi_data_nents);
2247 cmd->t_bidi_data_sg = NULL;
2248 cmd->t_bidi_data_nents = 0;
2249 }
47e459e6 2250 transport_reset_sgl_orig(cmd);
6708bb27 2251 return;
47e459e6
NB		 2252 }
2253 transport_reset_sgl_orig(cmd);
6708bb27 2254
e64aa657 2255 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2256 cmd->t_data_sg = NULL;
2257 cmd->t_data_nents = 0;
c66ac9db 2258
e64aa657 2259 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2260 cmd->t_bidi_data_sg = NULL;
2261 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2262}
2263
e26d99ae 2264/**
febe562c
NB		 2265 * transport_put_cmd - release a reference to a command
2266 * @cmd: command to release
e26d99ae 2267 *
febe562c 2268 * This routine releases our reference to the command and frees it if possible.
e26d99ae 2269 */
febe562c 2270static int transport_put_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2271{
2272 BUG_ON(!cmd->se_tfo);
e26d99ae 2273 /*
7481deb4
NB		 2274 * If this cmd has been setup with target_get_sess_cmd(), drop
2275 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2276 */
afc16604 2277 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2278}
2279
4949314c 2280void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2281{
ec98f782 2282 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2283 struct page **pages;
2284 int i;
05d1c7c0
AG		 2285
2286 /*
ec98f782
AG		 2287 * We need to take into account a possible offset here for fabrics like
2288 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2289 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2290 */
4949314c
AG		 2291 if (!cmd->t_data_nents)
2292 return NULL;
3717ef0c
PB		 2293
2294 BUG_ON(!sg);
2295 if (cmd->t_data_nents == 1)
4949314c
AG		 2296 return kmap(sg_page(sg)) + sg->offset;
2297
2298 /* >1 page. use vmap */
2299 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2300 if (!pages)
4949314c
AG		 2301 return NULL;
2302
2303 /* convert sg[] to pages[] */
2304 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2305 pages[i] = sg_page(sg);
2306 }
2307
2308 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2309 kfree(pages);
de103c93 2310 if (!cmd->t_data_vmap)
4949314c
AG		 2311 return NULL;
2312
2313 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2314}
4949314c 2315EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2316
4949314c 2317void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2318{
a1edf9cf 2319 if (!cmd->t_data_nents) {
4949314c 2320 return;
a1edf9cf 2321 } else if (cmd->t_data_nents == 1) {
4949314c 2322 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2323 return;
2324 }
4949314c
AG		 2325
2326 vunmap(cmd->t_data_vmap);
2327 cmd->t_data_vmap = NULL;
05d1c7c0 2328}
4949314c 2329EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2330
c5ff8d6b 2331int
20093994 2332target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
e64aa657 2333 bool zero_page, bool chainable)
c66ac9db 2334{
20093994 2335 struct scatterlist *sg;
ec98f782 2336 struct page *page;
20093994 2337 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
e64aa657 2338 unsigned int nalloc, nent;
ec98f782 2339 int i = 0;
c66ac9db 2340
e64aa657
CH		 2341 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2342 if (chainable)
2343 nalloc++;
2344 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
20093994 2345 if (!sg)
ec98f782 2346 return -ENOMEM;
c66ac9db 2347
e64aa657 2348 sg_init_table(sg, nalloc);
9db9da33 2349
ec98f782
AG		 2350 while (length) {
2351 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2352 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2353 if (!page)
2354 goto out;
c66ac9db 2355
20093994 2356 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2357 length -= page_len;
2358 i++;
c66ac9db 2359 }
20093994
NB		 2360 *sgl = sg;
2361 *nents = nent;
c66ac9db 2362 return 0;
c66ac9db 2363
ec98f782 2364out:
d0e27c88 2365 while (i > 0) {
ec98f782 2366 i--;
20093994 2367 __free_page(sg_page(&sg[i]));
c66ac9db 2368 }
20093994 2369 kfree(sg);
ec98f782 2370 return -ENOMEM;
c66ac9db 2371}
e64aa657 2372EXPORT_SYMBOL(target_alloc_sgl);
c66ac9db 2373
da0f7619 2374/*
b16a35b0
AG		 2375 * Allocate any required resources to execute the command. For writes we
2376 * might not have the payload yet, so notify the fabric via a call to
2377 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2378 */
de103c93
CH		 2379sense_reason_t
2380transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2381{
c66ac9db 2382 int ret = 0;
c8e63985 2383 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2384
5835812f
AM		 2385 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2386 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2387 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
e64aa657 2388 cmd->prot_length, true, false);
5835812f
AM		 2389 if (ret < 0)
2390 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2391 }
2392
c66ac9db
NB		 2393 /*
2394 * Determine is the TCM fabric module has already allocated physical
2395 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2396 * beforehand.
c66ac9db 2397 */
ec98f782
AG		 2398 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2399 cmd->data_length) {
20093994 2400
8cefe07b
NB		 2401 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2402 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2403 u32 bidi_length;
2404
2405 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2406 bidi_length = cmd->t_task_nolb *
2407 cmd->se_dev->dev_attrib.block_size;
2408 else
2409 bidi_length = cmd->data_length;
2410
2411 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2412 &cmd->t_bidi_data_nents,
e64aa657 2413 bidi_length, zero_flag, false);
8cefe07b
NB		 2414 if (ret < 0)
2415 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2416 }
2417
20093994 2418 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
e64aa657 2419 cmd->data_length, zero_flag, false);
c66ac9db 2420 if (ret < 0)
de103c93 2421 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2422 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2423 cmd->data_length) {
2424 /*
2425 * Special case for COMPARE_AND_WRITE with fabrics
2426 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2427 */
2428 u32 caw_length = cmd->t_task_nolb *
2429 cmd->se_dev->dev_attrib.block_size;
2430
2431 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2432 &cmd->t_bidi_data_nents,
e64aa657 2433 caw_length, zero_flag, false);
c8e63985
NB		 2434 if (ret < 0)
2435 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2436 }
c66ac9db 2437 /*
c3196f0c
CH		 2438 * If this command is not a write we can execute it right here,
2439 * for write buffers we need to notify the fabric driver first
2440 * and let it call back once the write buffers are ready.
c66ac9db 2441 */
5f41a31d 2442 target_add_to_state_list(cmd);
885e7b0e 2443 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2444 target_execute_cmd(cmd);
2445 return 0;
2446 }
862e6389 2447 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2448
2449 ret = cmd->se_tfo->write_pending(cmd);
2450 if (ret == -EAGAIN || ret == -ENOMEM)
2451 goto queue_full;
2452
de103c93
CH		 2453 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2454 WARN_ON(ret);
2455
b69c1fcf 2456 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2457
c3196f0c
CH		 2458queue_full:
2459 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2460 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2461 transport_handle_queue_full(cmd, cmd->se_dev);
2462 return 0;
c66ac9db 2463}
a1d8b49a 2464EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2465
e057f533 2466static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2467{
f147abb4
NB		 2468 int ret;
2469
2470 ret = cmd->se_tfo->write_pending(cmd);
2471 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2472 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2473 cmd);
2474 transport_handle_queue_full(cmd, cmd->se_dev);
2475 }
07bde79a
NB		 2476}
2477
0f4a9431
NB		 2478static bool
2479__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2480 unsigned long *flags);
2481
2482static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2483{
2484 unsigned long flags;
2485
2486 spin_lock_irqsave(&cmd->t_state_lock, flags);
2487 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2488 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2489}
2490
d5ddad41 2491int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2492{
d5ddad41 2493 int ret = 0;
0f4a9431 2494 bool aborted = false, tas = false;
d5ddad41 2495
d14921d6 2496 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2497 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2498 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2499
0f4a9431
NB		 2500 if (!aborted || tas)
2501 ret = transport_put_cmd(cmd);
d14921d6
NB		 2502 } else {
2503 if (wait_for_tasks)
0f4a9431 2504 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2505 /*
2506 * Handle WRITE failure case where transport_generic_new_cmd()
2507 * has already added se_cmd to state_list, but fabric has
2508 * failed command before I/O submission.
2509 */
febe562c 2510 if (cmd->state_active)
c130480b 2511 target_remove_from_state_list(cmd);
d14921d6 2512
82f1c8a4 2513 if (cmd->se_lun)
c66ac9db 2514 transport_lun_remove_cmd(cmd);
c66ac9db 2515
0f4a9431
NB		 2516 if (!aborted || tas)
2517 ret = transport_put_cmd(cmd);
2518 }
2519 /*
2520 * If the task has been internally aborted due to TMR ABORT_TASK
2521 * or LUN_RESET, target_core_tmr.c is responsible for performing
2522 * the remaining calls to target_put_sess_cmd(), and not the
2523 * callers of this function.
2524 */
2525 if (aborted) {
2526 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2527 wait_for_completion(&cmd->cmd_wait_comp);
2528 cmd->se_tfo->release_cmd(cmd);
2529 ret = 1;
c66ac9db 2530 }
d5ddad41 2531 return ret;
c66ac9db
NB		 2532}
2533EXPORT_SYMBOL(transport_generic_free_cmd);
2534
a17f091d 2535/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2536 * @se_cmd: command descriptor to add
a6360785 2537 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2538 */
afc16604 2539int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2540{
afc16604 2541 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2542 unsigned long flags;
bc187ea6 2543 int ret = 0;
a17f091d 2544
a6360785
NB		 2545 /*
2546 * Add a second kref if the fabric caller is expecting to handle
2547 * fabric acknowledgement that requires two target_put_sess_cmd()
2548 * invocations before se_cmd descriptor release.
2549 */
054922bb 2550 if (ack_kref)
a6360785 2551 kref_get(&se_cmd->cmd_kref);
7481deb4 2552
a17f091d 2553 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2554 if (se_sess->sess_tearing_down) {
2555 ret = -ESHUTDOWN;
2556 goto out;
2557 }
a17f091d 2558 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2559out:
a17f091d 2560 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2561
2562 if (ret && ack_kref)
afc16604 2563 target_put_sess_cmd(se_cmd);
7544e597 2564
bc187ea6 2565 return ret;
a17f091d 2566}
20361e69 2567EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2568
febe562c
NB		 2569static void target_free_cmd_mem(struct se_cmd *cmd)
2570{
2571 transport_free_pages(cmd);
2572
2573 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2574 core_tmr_release_req(cmd->se_tmr_req);
2575 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2576 kfree(cmd->t_task_cdb);
2577}
2578
7481deb4 2579static void target_release_cmd_kref(struct kref *kref)
a17f091d 2580{
7481deb4
NB		 2581 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2582 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2583 unsigned long flags;
0f4a9431 2584 bool fabric_stop;
a17f091d 2585
9ff9d15e 2586 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
0f4a9431
NB		 2587
2588 spin_lock(&se_cmd->t_state_lock);
064cdd2d
NB		 2589 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2590 (se_cmd->transport_state & CMD_T_ABORTED);
0f4a9431
NB		 2591 spin_unlock(&se_cmd->t_state_lock);
2592
2593 if (se_cmd->cmd_wait_set || fabric_stop) {
2594 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2595 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
febe562c 2596 target_free_cmd_mem(se_cmd);
a17f091d 2597 complete(&se_cmd->cmd_wait_comp);
7481deb4 2598 return;
a17f091d 2599 }
0f4a9431 2600 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2601 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2602
febe562c 2603 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2604 se_cmd->se_tfo->release_cmd(se_cmd);
2605}
2606
2607/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2608 * @se_cmd: command descriptor to drop
2609 */
afc16604 2610int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2611{
afc16604
BVA		 2612 struct se_session *se_sess = se_cmd->se_sess;
2613
0ed6e189 2614 if (!se_sess) {
febe562c 2615 target_free_cmd_mem(se_cmd);
0ed6e189
NB		 2616 se_cmd->se_tfo->release_cmd(se_cmd);
2617 return 1;
2618 }
9ff9d15e 2619 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2620}
2621EXPORT_SYMBOL(target_put_sess_cmd);
2622
1c7b13fe
RD		 2623/* target_sess_cmd_list_set_waiting - Flag all commands in
2624 * sess_cmd_list to complete cmd_wait_comp. Set
2625 * sess_tearing_down so no more commands are queued.
2626 * @se_sess: session to flag
a17f091d 2627 */
1c7b13fe 2628void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2629{
2630 struct se_cmd *se_cmd;
2631 unsigned long flags;
0f4a9431 2632 int rc;
a17f091d 2633
a17f091d 2634 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2635 if (se_sess->sess_tearing_down) {
2636 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2637 return;
2638 }
1c7b13fe 2639 se_sess->sess_tearing_down = 1;
9b31a328 2640 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2641
0f4a9431
NB		 2642 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) {
2643 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2644 if (rc) {
2645 se_cmd->cmd_wait_set = 1;
2646 spin_lock(&se_cmd->t_state_lock);
2647 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2648 spin_unlock(&se_cmd->t_state_lock);
2649 }
2650 }
a17f091d
NB		 2651
2652 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2653}
1c7b13fe 2654EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2655
2656/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2657 * @se_sess: session to wait for active I/O
a17f091d 2658 */
be646c2d 2659void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2660{
2661 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2662 unsigned long flags;
0f4a9431 2663 bool tas;
a17f091d
NB		 2664
2665 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2666 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2667 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2668 " %d\n", se_cmd, se_cmd->t_state,
2669 se_cmd->se_tfo->get_cmd_state(se_cmd));
2670
0f4a9431
NB		 2671 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2672 tas = (se_cmd->transport_state & CMD_T_TAS);
2673 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2674
2675 if (!target_put_sess_cmd(se_cmd)) {
2676 if (tas)
2677 target_put_sess_cmd(se_cmd);
2678 }
2679
be646c2d
JE		 2680 wait_for_completion(&se_cmd->cmd_wait_comp);
2681 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2682 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2683 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2684
2685 se_cmd->se_tfo->release_cmd(se_cmd);
2686 }
9b31a328
NB		 2687
2688 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2689 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2690 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2691
a17f091d
NB		 2692}
2693EXPORT_SYMBOL(target_wait_for_sess_cmds);
2694
b3eeea66 2695void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2696{
5277797d 2697 percpu_ref_kill(&lun->lun_ref);
5277797d 2698 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2699}
2700
0f4a9431
NB		 2701static bool
2702__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2703 bool *aborted, bool *tas, unsigned long *flags)
2704 __releases(&cmd->t_state_lock)
2705 __acquires(&cmd->t_state_lock)
c66ac9db 2706{
c66ac9db 2707
0f4a9431
NB		 2708 assert_spin_locked(&cmd->t_state_lock);
2709 WARN_ON_ONCE(!irqs_disabled());
2710
2711 if (fabric_stop)
2712 cmd->transport_state |= CMD_T_FABRIC_STOP;
2713
2714 if (cmd->transport_state & CMD_T_ABORTED)
2715 *aborted = true;
2716
2717 if (cmd->transport_state & CMD_T_TAS)
2718 *tas = true;
2719
c8e31f26 2720 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2721 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2722 return false;
cb4f4d3c 2723
c8e31f26 2724 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2725 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2726 return false;
7d680f3b 2727
0f4a9431
NB		 2728 if (!(cmd->transport_state & CMD_T_ACTIVE))
2729 return false;
2730
2731 if (fabric_stop && *aborted)
a17f091d 2732 return false;
c66ac9db 2733
7d680f3b 2734 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2735
0f4a9431
NB		 2736 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2737 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2738 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2739
0f4a9431 2740 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2741
a1d8b49a 2742 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2743
0f4a9431 2744 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2745 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2746
0f4a9431
NB		 2747 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2748 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2749
0f4a9431
NB		 2750 return true;
2751}
2752
2753/**
2754 * transport_wait_for_tasks - wait for completion to occur
2755 * @cmd: command to wait
2756 *
2757 * Called from frontend fabric context to wait for storage engine
2758 * to pause and/or release frontend generated struct se_cmd.
2759 */
2760bool transport_wait_for_tasks(struct se_cmd *cmd)
2761{
2762 unsigned long flags;
2763 bool ret, aborted = false, tas = false;
2764
2765 spin_lock_irqsave(&cmd->t_state_lock, flags);
2766 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 2767 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2768
0f4a9431 2769 return ret;
c66ac9db 2770}
d14921d6 2771EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2772
ab78fef4
BVA		 2773struct sense_info {
2774 u8 key;
2775 u8 asc;
2776 u8 ascq;
2777 bool add_sector_info;
2778};
2779
2780static const struct sense_info sense_info_table[] = {
2781 [TCM_NO_SENSE] = {
2782 .key = NOT_READY
2783 },
2784 [TCM_NON_EXISTENT_LUN] = {
2785 .key = ILLEGAL_REQUEST,
2786 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2787 },
2788 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2789 .key = ILLEGAL_REQUEST,
2790 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2791 },
2792 [TCM_SECTOR_COUNT_TOO_MANY] = {
2793 .key = ILLEGAL_REQUEST,
2794 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2795 },
2796 [TCM_UNKNOWN_MODE_PAGE] = {
2797 .key = ILLEGAL_REQUEST,
2798 .asc = 0x24, /* INVALID FIELD IN CDB */
2799 },
2800 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2801 .key = ABORTED_COMMAND,
2802 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2803 .ascq = 0x03,
2804 },
2805 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2806 .key = ABORTED_COMMAND,
2807 .asc = 0x0c, /* WRITE ERROR */
2808 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2809 },
2810 [TCM_INVALID_CDB_FIELD] = {
2811 .key = ILLEGAL_REQUEST,
2812 .asc = 0x24, /* INVALID FIELD IN CDB */
2813 },
2814 [TCM_INVALID_PARAMETER_LIST] = {
2815 .key = ILLEGAL_REQUEST,
2816 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2817 },
2818 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2819 .key = ILLEGAL_REQUEST,
2820 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2821 },
2822 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2823 .key = ILLEGAL_REQUEST,
2824 .asc = 0x0c, /* WRITE ERROR */
2825 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2826 },
2827 [TCM_SERVICE_CRC_ERROR] = {
2828 .key = ABORTED_COMMAND,
2829 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2830 .ascq = 0x05, /* N/A */
2831 },
2832 [TCM_SNACK_REJECTED] = {
2833 .key = ABORTED_COMMAND,
2834 .asc = 0x11, /* READ ERROR */
2835 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2836 },
2837 [TCM_WRITE_PROTECTED] = {
2838 .key = DATA_PROTECT,
2839 .asc = 0x27, /* WRITE PROTECTED */
2840 },
2841 [TCM_ADDRESS_OUT_OF_RANGE] = {
2842 .key = ILLEGAL_REQUEST,
2843 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2844 },
2845 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2846 .key = UNIT_ATTENTION,
2847 },
2848 [TCM_CHECK_CONDITION_NOT_READY] = {
2849 .key = NOT_READY,
2850 },
2851 [TCM_MISCOMPARE_VERIFY] = {
2852 .key = MISCOMPARE,
2853 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2854 .ascq = 0x00,
2855 },
2856 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2857 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2858 .asc = 0x10,
2859 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2860 .add_sector_info = true,
2861 },
2862 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2863 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2864 .asc = 0x10,
2865 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2866 .add_sector_info = true,
2867 },
2868 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2869 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2870 .asc = 0x10,
2871 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2872 .add_sector_info = true,
2873 },
2874 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2875 /*
2876 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2877 * Solaris initiators. Returning NOT READY instead means the
2878 * operations will be retried a finite number of times and we
2879 * can survive intermittent errors.
2880 */
2881 .key = NOT_READY,
2882 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2883 },
2884};
2885
f5a8b3a7 2886static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2887{
2888 const struct sense_info *si;
2889 u8 *buffer = cmd->sense_buffer;
2890 int r = (__force int)reason;
2891 u8 asc, ascq;
4e4937e8 2892 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2893
2894 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2895 si = &sense_info_table[r];
2896 else
2897 si = &sense_info_table[(__force int)
2898 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2899
ab78fef4
BVA		 2900 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2901 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2902 WARN_ON_ONCE(asc == 0);
2903 } else if (si->asc == 0) {
2904 WARN_ON_ONCE(cmd->scsi_asc == 0);
2905 asc = cmd->scsi_asc;
2906 ascq = cmd->scsi_ascq;
2907 } else {
2908 asc = si->asc;
2909 ascq = si->ascq;
2910 }
9ec1e1ce 2911
4e4937e8 2912 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 2913 if (si->add_sector_info)
f5a8b3a7
SG		 2914 return scsi_set_sense_information(buffer,
2915 cmd->scsi_sense_length,
2916 cmd->bad_sector);
2917
2918 return 0;
ab78fef4
BVA		 2919}
2920
de103c93
CH		 2921int
2922transport_send_check_condition_and_sense(struct se_cmd *cmd,
2923 sense_reason_t reason, int from_transport)
c66ac9db 2924{
c66ac9db 2925 unsigned long flags;
c66ac9db 2926
a1d8b49a 2927 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2928 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2929 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2930 return 0;
2931 }
2932 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2933 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2934
ab78fef4 2935 if (!from_transport) {
f5a8b3a7
SG		 2936 int rc;
2937
c66ac9db 2938 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 2939 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2940 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 2941 rc = translate_sense_reason(cmd, reason);
2942 if (rc)
2943 return rc;
c66ac9db 2944 }
c66ac9db 2945
e5c0d6ad 2946 trace_target_cmd_complete(cmd);
07bde79a 2947 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2948}
2949EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2950
310d3d31
NB		 2951static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2952 __releases(&cmd->t_state_lock)
2953 __acquires(&cmd->t_state_lock)
c66ac9db 2954{
310d3d31
NB		 2955 assert_spin_locked(&cmd->t_state_lock);
2956 WARN_ON_ONCE(!irqs_disabled());
2957
c18bc7d8
RD		 2958 if (!(cmd->transport_state & CMD_T_ABORTED))
2959 return 0;
68259b5a
AL		 2960 /*
2961 * If cmd has been aborted but either no status is to be sent or it has
2962 * already been sent, just return
2963 */
310d3d31
NB		 2964 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
2965 if (send_status)
2966 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 2967 return 1;
310d3d31 2968 }
8b1e1244 2969
310d3d31
NB		 2970 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
2971 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2972
68259b5a 2973 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2974 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2975 trace_target_cmd_complete(cmd);
310d3d31
NB		 2976
2977 spin_unlock_irq(&cmd->t_state_lock);
c18bc7d8 2978 cmd->se_tfo->queue_status(cmd);
310d3d31 2979 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 2980
2981 return 1;
c66ac9db 2982}
310d3d31
NB		 2983
2984int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2985{
2986 int ret;
2987
2988 spin_lock_irq(&cmd->t_state_lock);
2989 ret = __transport_check_aborted_status(cmd, send_status);
2990 spin_unlock_irq(&cmd->t_state_lock);
2991
2992 return ret;
2993}
c66ac9db
NB		 2994EXPORT_SYMBOL(transport_check_aborted_status);
2995
2996void transport_send_task_abort(struct se_cmd *cmd)
2997{
c252f003
NB		 2998 unsigned long flags;
2999
3000 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 3001 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 3002 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3003 return;
3004 }
3005 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3006
c66ac9db
NB		 3007 /*
3008 * If there are still expected incoming fabric WRITEs, we wait
3009 * until until they have completed before sending a TASK_ABORTED
3010 * response. This response with TASK_ABORTED status will be
3011 * queued back to fabric module by transport_check_aborted_status().
3012 */
3013 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3014 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 3015 spin_lock_irqsave(&cmd->t_state_lock, flags);
3016 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3017 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3018 goto send_abort;
3019 }
68259b5a 3020 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 3021 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 3022 return;
c66ac9db
NB		 3023 }
3024 }
310d3d31 3025send_abort:
c66ac9db 3026 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3027
72b59d6e
RD		 3028 transport_lun_remove_cmd(cmd);
3029
649ee054
BVA		 3030 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3031 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3032
e5c0d6ad 3033 trace_target_cmd_complete(cmd);
e3d6f909 3034 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3035}
3036
af877292 3037static void target_tmr_work(struct work_struct *work)
c66ac9db 3038{
af877292 3039 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3040 struct se_device *dev = cmd->se_dev;
c66ac9db 3041 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 3042 unsigned long flags;
c66ac9db
NB		 3043 int ret;
3044
a6d9bb1c
NB		 3045 spin_lock_irqsave(&cmd->t_state_lock, flags);
3046 if (cmd->transport_state & CMD_T_ABORTED) {
3047 tmr->response = TMR_FUNCTION_REJECTED;
3048 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3049 goto check_stop;
3050 }
3051 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3052
c66ac9db 3053 switch (tmr->function) {
5c6cd613 3054 case TMR_ABORT_TASK:
3d28934a 3055 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3056 break;
5c6cd613
NB		 3057 case TMR_ABORT_TASK_SET:
3058 case TMR_CLEAR_ACA:
3059 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3060 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3061 break;
5c6cd613 3062 case TMR_LUN_RESET:
c66ac9db
NB		 3063 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3064 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3065 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3066 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3067 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3068 cmd->orig_fe_lun, 0x29,
3069 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3070 }
c66ac9db 3071 break;
5c6cd613 3072 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3073 tmr->response = TMR_FUNCTION_REJECTED;
3074 break;
5c6cd613 3075 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3076 tmr->response = TMR_FUNCTION_REJECTED;
3077 break;
c66ac9db 3078 default:
6708bb27 3079 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3080 tmr->function);
3081 tmr->response = TMR_FUNCTION_REJECTED;
3082 break;
3083 }
3084
a6d9bb1c
NB		 3085 spin_lock_irqsave(&cmd->t_state_lock, flags);
3086 if (cmd->transport_state & CMD_T_ABORTED) {
3087 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3088 goto check_stop;
3089 }
c66ac9db 3090 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
a6d9bb1c
NB		 3091 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3092
e3d6f909 3093 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3094
a6d9bb1c 3095check_stop:
b7b8bef7 3096 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3097}
3098
af877292
CH		 3099int transport_generic_handle_tmr(
3100 struct se_cmd *cmd)
c66ac9db 3101{
f15e9cd9
NB		 3102 unsigned long flags;
3103
3104 spin_lock_irqsave(&cmd->t_state_lock, flags);
3105 cmd->transport_state |= CMD_T_ACTIVE;
3106 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3107
af877292
CH		 3108 INIT_WORK(&cmd->work, target_tmr_work);
3109 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3110 return 0;
3111}
af877292 3112EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3113
3114bool
3115target_check_wce(struct se_device *dev)
3116{
3117 bool wce = false;
3118
3119 if (dev->transport->get_write_cache)
3120 wce = dev->transport->get_write_cache(dev);
3121 else if (dev->dev_attrib.emulate_write_cache > 0)
3122 wce = true;
3123
3124 return wce;
3125}
3126
3127bool
3128target_check_fua(struct se_device *dev)
3129{
3130 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3131}
Linux 6.x block layer and io_uring tree(s)