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target: Don't override EXTENDED_COPY xcopy_pt_cmd SCSI status code
[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:
449a1378 1709 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
c66ac9db 1710 break;
de103c93
CH		 1711 case TCM_OUT_OF_RESOURCES:
1712 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1713 break;
03e98c9e 1714 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1715 /*
1716 * No SENSE Data payload for this case, set SCSI Status
1717 * and queue the response to $FABRIC_MOD.
1718 *
1719 * Uses linux/include/scsi/scsi.h SAM status codes defs
1720 */
1721 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1722 /*
1723 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1724 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1725 * CONFLICT STATUS.
1726 *
1727 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1728 */
e3d6f909 1729 if (cmd->se_sess &&
c51c8e7b
HR		 1730 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1731 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1732 cmd->orig_fe_lun, 0x2C,
1733 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1734 }
e5c0d6ad 1735 trace_target_cmd_complete(cmd);
c51c8e7b 1736 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1737 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1738 goto queue_full;
c66ac9db 1739 goto check_stop;
c66ac9db 1740 default:
6708bb27 1741 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1742 cmd->t_task_cdb[0], sense_reason);
1743 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1744 break;
1745 }
f3146437 1746
de103c93 1747 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1748 if (ret == -EAGAIN || ret == -ENOMEM)
1749 goto queue_full;
07bde79a 1750
c66ac9db
NB		 1751check_stop:
1752 transport_lun_remove_cmd(cmd);
06b967e4 1753 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1754 return;
1755
1756queue_full:
e057f533
CH		 1757 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1758 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1759}
2fbff127 1760EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1761
dff0ca9e 1762void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
c66ac9db 1763{
de103c93 1764 sense_reason_t ret;
5f41a31d 1765
dff0ca9e
NB		 1766 if (!cmd->execute_cmd) {
1767 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1768 goto err;
1769 }
1770 if (do_checks) {
1771 /*
1772 * Check for an existing UNIT ATTENTION condition after
1773 * target_handle_task_attr() has done SAM task attr
1774 * checking, and possibly have already defered execution
1775 * out to target_restart_delayed_cmds() context.
1776 */
1777 ret = target_scsi3_ua_check(cmd);
1778 if (ret)
1779 goto err;
1780
1781 ret = target_alua_state_check(cmd);
1782 if (ret)
1783 goto err;
5f41a31d 1784
dff0ca9e
NB		 1785 ret = target_check_reservation(cmd);
1786 if (ret) {
1787 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1788 goto err;
de103c93 1789 }
5f41a31d 1790 }
dff0ca9e
NB		 1791
1792 ret = cmd->execute_cmd(cmd);
1793 if (!ret)
1794 return;
1795err:
1796 spin_lock_irq(&cmd->t_state_lock);
1797 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1798 spin_unlock_irq(&cmd->t_state_lock);
1799
1800 transport_generic_request_failure(cmd, ret);
5f41a31d
CH		 1801}
1802
aa58b531
NB		 1803static int target_write_prot_action(struct se_cmd *cmd)
1804{
5132d1e6 1805 u32 sectors;
aa58b531
NB		 1806 /*
1807 * Perform WRITE_INSERT of PI using software emulation when backend
1808 * device has PI enabled, if the transport has not already generated
1809 * PI using hardware WRITE_INSERT offload.
1810 */
1811 switch (cmd->prot_op) {
1812 case TARGET_PROT_DOUT_INSERT:
1813 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1814 sbc_dif_generate(cmd);
1815 break;
5132d1e6
NB		 1816 case TARGET_PROT_DOUT_STRIP:
1817 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1818 break;
1819
1820 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1821 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1822 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1823 if (unlikely(cmd->pi_err)) {
1824 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1825 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1826 spin_unlock_irq(&cmd->t_state_lock);
1827 transport_generic_request_failure(cmd, cmd->pi_err);
1828 return -1;
1829 }
1830 break;
aa58b531
NB		 1831 default:
1832 break;
1833 }
1834
1835 return 0;
1836}
1837
019c4ca6 1838static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1839{
1840 struct se_device *dev = cmd->se_dev;
1841
a3541703 1842 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1843 return false;
5f41a31d 1844
410c29df
NB		 1845 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1846
c66ac9db 1847 /*
25985edc 1848 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1849 * to allow the passed struct se_cmd list of tasks to the front of the list.
1850 */
5f41a31d 1851 switch (cmd->sam_task_attr) {
68d81f40 1852 case TCM_HEAD_TAG:
9c31820b
RD		 1853 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1854 cmd->t_task_cdb[0]);
019c4ca6 1855 return false;
68d81f40 1856 case TCM_ORDERED_TAG:
33940d09 1857 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1858
9c31820b
RD		 1859 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1860 cmd->t_task_cdb[0]);
5f41a31d 1861
c66ac9db 1862 /*
5f41a31d
CH		 1863 * Execute an ORDERED command if no other older commands
1864 * exist that need to be completed first.
c66ac9db 1865 */
5f41a31d 1866 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1867 return false;
5f41a31d
CH		 1868 break;
1869 default:
c66ac9db
NB		 1870 /*
1871 * For SIMPLE and UNTAGGED Task Attribute commands
1872 */
33940d09 1873 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1874 break;
c66ac9db 1875 }
5f41a31d 1876
019c4ca6
CH		 1877 if (atomic_read(&dev->dev_ordered_sync) == 0)
1878 return false;
c66ac9db 1879
019c4ca6
CH		 1880 spin_lock(&dev->delayed_cmd_lock);
1881 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1882 spin_unlock(&dev->delayed_cmd_lock);
1883
9c31820b
RD		 1884 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1885 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1886 return true;
1887}
1888
310d3d31
NB		 1889static int __transport_check_aborted_status(struct se_cmd *, int);
1890
019c4ca6
CH		 1891void target_execute_cmd(struct se_cmd *cmd)
1892{
019c4ca6
CH		 1893 /*
1894 * Determine if frontend context caller is requesting the stopping of
1895 * this command for frontend exceptions.
310d3d31
NB		 1896 *
1897 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1898 */
4a9a6c8d 1899 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1900 if (__transport_check_aborted_status(cmd, 1)) {
1901 spin_unlock_irq(&cmd->t_state_lock);
1902 return;
1903 }
019c4ca6 1904 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1905 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1906 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1907
1908 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1909 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1910 return;
1911 }
1912
1913 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1914 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1915 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1916
1917 if (target_write_prot_action(cmd))
1918 return;
019c4ca6 1919
1a398b97
NB		 1920 if (target_handle_task_attr(cmd)) {
1921 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1922 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1923 spin_unlock_irq(&cmd->t_state_lock);
1924 return;
1925 }
1926
dff0ca9e 1927 __target_execute_cmd(cmd, true);
c66ac9db 1928}
70baf0ab 1929EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1930
5f41a31d
CH		 1931/*
1932 * Process all commands up to the last received ORDERED task attribute which
1933 * requires another blocking boundary
1934 */
1935static void target_restart_delayed_cmds(struct se_device *dev)
1936{
1937 for (;;) {
1938 struct se_cmd *cmd;
1939
1940 spin_lock(&dev->delayed_cmd_lock);
1941 if (list_empty(&dev->delayed_cmd_list)) {
1942 spin_unlock(&dev->delayed_cmd_lock);
1943 break;
1944 }
1945
1946 cmd = list_entry(dev->delayed_cmd_list.next,
1947 struct se_cmd, se_delayed_node);
1948 list_del(&cmd->se_delayed_node);
1949 spin_unlock(&dev->delayed_cmd_lock);
1950
dff0ca9e 1951 __target_execute_cmd(cmd, true);
5f41a31d 1952
68d81f40 1953 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1954 break;
1955 }
1956}
1957
c66ac9db 1958/*
35e0e757 1959 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1960 * and ordered cmds need to have their tasks added to the execution queue.
1961 */
1962static void transport_complete_task_attr(struct se_cmd *cmd)
1963{
5951146d 1964 struct se_device *dev = cmd->se_dev;
c66ac9db 1965
a3541703 1966 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1967 return;
1968
410c29df
NB		 1969 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
1970 goto restart;
1971
68d81f40 1972 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1973 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1974 dev->dev_cur_ordered_id++;
9c31820b
RD		 1975 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1976 dev->dev_cur_ordered_id);
68d81f40 1977 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1978 dev->dev_cur_ordered_id++;
9c31820b
RD		 1979 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1980 dev->dev_cur_ordered_id);
68d81f40 1981 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1982 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1983
1984 dev->dev_cur_ordered_id++;
9c31820b
RD		 1985 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1986 dev->dev_cur_ordered_id);
c66ac9db 1987 }
410c29df 1988restart:
5f41a31d 1989 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1990}
1991
e057f533 1992static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1993{
1994 int ret = 0;
1995
019c4ca6 1996 transport_complete_task_attr(cmd);
e057f533
CH		 1997
1998 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1999 trace_target_cmd_complete(cmd);
e057f533 2000 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 2001 goto out;
e057f533 2002 }
07bde79a
NB		 2003
2004 switch (cmd->data_direction) {
2005 case DMA_FROM_DEVICE:
4347ab5a
NB		 2006 if (cmd->scsi_status)
2007 goto queue_status;
2008
e5c0d6ad 2009 trace_target_cmd_complete(cmd);
07bde79a
NB		 2010 ret = cmd->se_tfo->queue_data_in(cmd);
2011 break;
2012 case DMA_TO_DEVICE:
64577407 2013 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 2014 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 2015 break;
07bde79a
NB		 2016 }
2017 /* Fall through for DMA_TO_DEVICE */
2018 case DMA_NONE:
4347ab5a 2019queue_status:
e5c0d6ad 2020 trace_target_cmd_complete(cmd);
07bde79a
NB		 2021 ret = cmd->se_tfo->queue_status(cmd);
2022 break;
2023 default:
2024 break;
2025 }
2026
e057f533
CH		 2027out:
2028 if (ret < 0) {
2029 transport_handle_queue_full(cmd, cmd->se_dev);
2030 return;
2031 }
2032 transport_lun_remove_cmd(cmd);
2033 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2034}
2035
2036static void transport_handle_queue_full(
2037 struct se_cmd *cmd,
e057f533 2038 struct se_device *dev)
07bde79a
NB		 2039{
2040 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2041 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2042 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2043 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2044
2045 schedule_work(&cmd->se_dev->qf_work_queue);
2046}
2047
fdeab852 2048static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2049{
fdeab852
NB		 2050 switch (cmd->prot_op) {
2051 case TARGET_PROT_DIN_STRIP:
2052 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2053 u32 sectors = cmd->data_length >>
2054 ilog2(cmd->se_dev->dev_attrib.block_size);
2055
2056 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2057 sectors, 0, cmd->t_prot_sg,
2058 0);
2059 if (cmd->pi_err)
fdeab852 2060 return true;
bc005869 2061 }
fdeab852 2062 break;
72c03850
NB		 2063 case TARGET_PROT_DIN_INSERT:
2064 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2065 break;
2066
2067 sbc_dif_generate(cmd);
2068 break;
fdeab852
NB		 2069 default:
2070 break;
bc005869
NB		 2071 }
2072
2073 return false;
2074}
2075
35e0e757 2076static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2077{
35e0e757 2078 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2079 int ret;
35e0e757 2080
c66ac9db
NB		 2081 /*
2082 * Check if we need to move delayed/dormant tasks from cmds on the
2083 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2084 * Attribute.
2085 */
019c4ca6
CH		 2086 transport_complete_task_attr(cmd);
2087
07bde79a
NB		 2088 /*
2089 * Check to schedule QUEUE_FULL work, or execute an existing
2090 * cmd->transport_qf_callback()
2091 */
2092 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2093 schedule_work(&cmd->se_dev->qf_work_queue);
2094
c66ac9db 2095 /*
d5829eac 2096 * Check if we need to send a sense buffer from
c66ac9db
NB		 2097 * the struct se_cmd in question.
2098 */
2099 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2100 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2101 ret = transport_send_check_condition_and_sense(
2102 cmd, 0, 1);
2103 if (ret == -EAGAIN || ret == -ENOMEM)
2104 goto queue_full;
2105
2106 transport_lun_remove_cmd(cmd);
2107 transport_cmd_check_stop_to_fabric(cmd);
2108 return;
c66ac9db
NB		 2109 }
2110 /*
25985edc 2111 * Check for a callback, used by amongst other things
a6b0133c 2112 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2113 */
a6b0133c
NB		 2114 if (cmd->transport_complete_callback) {
2115 sense_reason_t rc;
057085e5
NB		 2116 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2117 bool zero_dl = !(cmd->data_length);
2118 int post_ret = 0;
a6b0133c 2119
057085e5
NB		 2120 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2121 if (!rc && !post_ret) {
2122 if (caw && zero_dl)
c8e63985
NB		 2123 goto queue_rsp;
2124
a6b0133c 2125 return;
a2890087
NB		 2126 } else if (rc) {
2127 ret = transport_send_check_condition_and_sense(cmd,
2128 rc, 0);
2129 if (ret == -EAGAIN || ret == -ENOMEM)
2130 goto queue_full;
a6b0133c 2131
a2890087
NB		 2132 transport_lun_remove_cmd(cmd);
2133 transport_cmd_check_stop_to_fabric(cmd);
2134 return;
2135 }
a6b0133c 2136 }
c66ac9db 2137
c8e63985 2138queue_rsp:
c66ac9db
NB		 2139 switch (cmd->data_direction) {
2140 case DMA_FROM_DEVICE:
4347ab5a
NB		 2141 if (cmd->scsi_status)
2142 goto queue_status;
2143
4cc987ea
NB		 2144 atomic_long_add(cmd->data_length,
2145 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2146 /*
2147 * Perform READ_STRIP of PI using software emulation when
2148 * backend had PI enabled, if the transport will not be
2149 * performing hardware READ_STRIP offload.
2150 */
fdeab852 2151 if (target_read_prot_action(cmd)) {
bc005869
NB		 2152 ret = transport_send_check_condition_and_sense(cmd,
2153 cmd->pi_err, 0);
2154 if (ret == -EAGAIN || ret == -ENOMEM)
2155 goto queue_full;
2156
2157 transport_lun_remove_cmd(cmd);
2158 transport_cmd_check_stop_to_fabric(cmd);
2159 return;
2160 }
c66ac9db 2161
e5c0d6ad 2162 trace_target_cmd_complete(cmd);
07bde79a 2163 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2164 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2165 goto queue_full;
c66ac9db
NB		 2166 break;
2167 case DMA_TO_DEVICE:
4cc987ea
NB		 2168 atomic_long_add(cmd->data_length,
2169 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2170 /*
2171 * Check if we need to send READ payload for BIDI-COMMAND
2172 */
64577407 2173 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2174 atomic_long_add(cmd->data_length,
2175 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2176 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2177 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2178 goto queue_full;
c66ac9db
NB		 2179 break;
2180 }
2181 /* Fall through for DMA_TO_DEVICE */
2182 case DMA_NONE:
4347ab5a 2183queue_status:
e5c0d6ad 2184 trace_target_cmd_complete(cmd);
07bde79a 2185 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2186 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2187 goto queue_full;
c66ac9db
NB		 2188 break;
2189 default:
2190 break;
2191 }
2192
2193 transport_lun_remove_cmd(cmd);
2194 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2195 return;
2196
2197queue_full:
6708bb27 2198 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2199 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2200 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2201 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2202}
2203
e64aa657 2204void target_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2205{
ec98f782 2206 struct scatterlist *sg;
ec98f782 2207 int count;
c66ac9db 2208
6708bb27
AG		 2209 for_each_sg(sgl, sg, nents, count)
2210 __free_page(sg_page(sg));
c66ac9db 2211
6708bb27
AG		 2212 kfree(sgl);
2213}
e64aa657 2214EXPORT_SYMBOL(target_free_sgl);
c66ac9db 2215
47e459e6
NB		 2216static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2217{
2218 /*
2219 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2220 * emulation, and free + reset pointers if necessary..
2221 */
2222 if (!cmd->t_data_sg_orig)
2223 return;
2224
2225 kfree(cmd->t_data_sg);
2226 cmd->t_data_sg = cmd->t_data_sg_orig;
2227 cmd->t_data_sg_orig = NULL;
2228 cmd->t_data_nents = cmd->t_data_nents_orig;
2229 cmd->t_data_nents_orig = 0;
2230}
2231
6708bb27
AG		 2232static inline void transport_free_pages(struct se_cmd *cmd)
2233{
5835812f 2234 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
e64aa657 2235 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
5835812f
AM		 2236 cmd->t_prot_sg = NULL;
2237 cmd->t_prot_nents = 0;
2238 }
2239
47e459e6 2240 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2241 /*
2242 * Release special case READ buffer payload required for
2243 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2244 */
2245 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
e64aa657 2246 target_free_sgl(cmd->t_bidi_data_sg,
c8e63985
NB		 2247 cmd->t_bidi_data_nents);
2248 cmd->t_bidi_data_sg = NULL;
2249 cmd->t_bidi_data_nents = 0;
2250 }
47e459e6 2251 transport_reset_sgl_orig(cmd);
6708bb27 2252 return;
47e459e6
NB		 2253 }
2254 transport_reset_sgl_orig(cmd);
6708bb27 2255
e64aa657 2256 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2257 cmd->t_data_sg = NULL;
2258 cmd->t_data_nents = 0;
c66ac9db 2259
e64aa657 2260 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2261 cmd->t_bidi_data_sg = NULL;
2262 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2263}
2264
e26d99ae 2265/**
febe562c
NB		 2266 * transport_put_cmd - release a reference to a command
2267 * @cmd: command to release
e26d99ae 2268 *
febe562c 2269 * This routine releases our reference to the command and frees it if possible.
e26d99ae 2270 */
febe562c 2271static int transport_put_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2272{
2273 BUG_ON(!cmd->se_tfo);
e26d99ae 2274 /*
7481deb4
NB		 2275 * If this cmd has been setup with target_get_sess_cmd(), drop
2276 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2277 */
afc16604 2278 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2279}
2280
4949314c 2281void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2282{
ec98f782 2283 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2284 struct page **pages;
2285 int i;
05d1c7c0
AG		 2286
2287 /*
ec98f782
AG		 2288 * We need to take into account a possible offset here for fabrics like
2289 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2290 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2291 */
4949314c
AG		 2292 if (!cmd->t_data_nents)
2293 return NULL;
3717ef0c
PB		 2294
2295 BUG_ON(!sg);
2296 if (cmd->t_data_nents == 1)
4949314c
AG		 2297 return kmap(sg_page(sg)) + sg->offset;
2298
2299 /* >1 page. use vmap */
2300 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2301 if (!pages)
4949314c
AG		 2302 return NULL;
2303
2304 /* convert sg[] to pages[] */
2305 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2306 pages[i] = sg_page(sg);
2307 }
2308
2309 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2310 kfree(pages);
de103c93 2311 if (!cmd->t_data_vmap)
4949314c
AG		 2312 return NULL;
2313
2314 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2315}
4949314c 2316EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2317
4949314c 2318void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2319{
a1edf9cf 2320 if (!cmd->t_data_nents) {
4949314c 2321 return;
a1edf9cf 2322 } else if (cmd->t_data_nents == 1) {
4949314c 2323 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2324 return;
2325 }
4949314c
AG		 2326
2327 vunmap(cmd->t_data_vmap);
2328 cmd->t_data_vmap = NULL;
05d1c7c0 2329}
4949314c 2330EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2331
c5ff8d6b 2332int
20093994 2333target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
e64aa657 2334 bool zero_page, bool chainable)
c66ac9db 2335{
20093994 2336 struct scatterlist *sg;
ec98f782 2337 struct page *page;
20093994 2338 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
e64aa657 2339 unsigned int nalloc, nent;
ec98f782 2340 int i = 0;
c66ac9db 2341
e64aa657
CH		 2342 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2343 if (chainable)
2344 nalloc++;
2345 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
20093994 2346 if (!sg)
ec98f782 2347 return -ENOMEM;
c66ac9db 2348
e64aa657 2349 sg_init_table(sg, nalloc);
9db9da33 2350
ec98f782
AG		 2351 while (length) {
2352 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2353 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2354 if (!page)
2355 goto out;
c66ac9db 2356
20093994 2357 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2358 length -= page_len;
2359 i++;
c66ac9db 2360 }
20093994
NB		 2361 *sgl = sg;
2362 *nents = nent;
c66ac9db 2363 return 0;
c66ac9db 2364
ec98f782 2365out:
d0e27c88 2366 while (i > 0) {
ec98f782 2367 i--;
20093994 2368 __free_page(sg_page(&sg[i]));
c66ac9db 2369 }
20093994 2370 kfree(sg);
ec98f782 2371 return -ENOMEM;
c66ac9db 2372}
e64aa657 2373EXPORT_SYMBOL(target_alloc_sgl);
c66ac9db 2374
da0f7619 2375/*
b16a35b0
AG		 2376 * Allocate any required resources to execute the command. For writes we
2377 * might not have the payload yet, so notify the fabric via a call to
2378 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2379 */
de103c93
CH		 2380sense_reason_t
2381transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2382{
c66ac9db 2383 int ret = 0;
c8e63985 2384 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2385
5835812f
AM		 2386 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2387 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2388 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
e64aa657 2389 cmd->prot_length, true, false);
5835812f
AM		 2390 if (ret < 0)
2391 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2392 }
2393
c66ac9db
NB		 2394 /*
2395 * Determine is the TCM fabric module has already allocated physical
2396 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2397 * beforehand.
c66ac9db 2398 */
ec98f782
AG		 2399 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2400 cmd->data_length) {
20093994 2401
8cefe07b
NB		 2402 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2403 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2404 u32 bidi_length;
2405
2406 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2407 bidi_length = cmd->t_task_nolb *
2408 cmd->se_dev->dev_attrib.block_size;
2409 else
2410 bidi_length = cmd->data_length;
2411
2412 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2413 &cmd->t_bidi_data_nents,
e64aa657 2414 bidi_length, zero_flag, false);
8cefe07b
NB		 2415 if (ret < 0)
2416 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2417 }
2418
20093994 2419 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
e64aa657 2420 cmd->data_length, zero_flag, false);
c66ac9db 2421 if (ret < 0)
de103c93 2422 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2423 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2424 cmd->data_length) {
2425 /*
2426 * Special case for COMPARE_AND_WRITE with fabrics
2427 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2428 */
2429 u32 caw_length = cmd->t_task_nolb *
2430 cmd->se_dev->dev_attrib.block_size;
2431
2432 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2433 &cmd->t_bidi_data_nents,
e64aa657 2434 caw_length, zero_flag, false);
c8e63985
NB		 2435 if (ret < 0)
2436 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2437 }
c66ac9db 2438 /*
c3196f0c
CH		 2439 * If this command is not a write we can execute it right here,
2440 * for write buffers we need to notify the fabric driver first
2441 * and let it call back once the write buffers are ready.
c66ac9db 2442 */
5f41a31d 2443 target_add_to_state_list(cmd);
885e7b0e 2444 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2445 target_execute_cmd(cmd);
2446 return 0;
2447 }
862e6389 2448 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2449
2450 ret = cmd->se_tfo->write_pending(cmd);
2451 if (ret == -EAGAIN || ret == -ENOMEM)
2452 goto queue_full;
2453
de103c93
CH		 2454 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2455 WARN_ON(ret);
2456
b69c1fcf 2457 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2458
c3196f0c
CH		 2459queue_full:
2460 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2461 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2462 transport_handle_queue_full(cmd, cmd->se_dev);
2463 return 0;
c66ac9db 2464}
a1d8b49a 2465EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2466
e057f533 2467static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2468{
f147abb4
NB		 2469 int ret;
2470
2471 ret = cmd->se_tfo->write_pending(cmd);
2472 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2473 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2474 cmd);
2475 transport_handle_queue_full(cmd, cmd->se_dev);
2476 }
07bde79a
NB		 2477}
2478
0f4a9431
NB		 2479static bool
2480__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2481 unsigned long *flags);
2482
2483static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2484{
2485 unsigned long flags;
2486
2487 spin_lock_irqsave(&cmd->t_state_lock, flags);
2488 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2490}
2491
d5ddad41 2492int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2493{
d5ddad41 2494 int ret = 0;
0f4a9431 2495 bool aborted = false, tas = false;
d5ddad41 2496
d14921d6 2497 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2498 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2499 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2500
0f4a9431
NB		 2501 if (!aborted || tas)
2502 ret = transport_put_cmd(cmd);
d14921d6
NB		 2503 } else {
2504 if (wait_for_tasks)
0f4a9431 2505 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2506 /*
2507 * Handle WRITE failure case where transport_generic_new_cmd()
2508 * has already added se_cmd to state_list, but fabric has
2509 * failed command before I/O submission.
2510 */
febe562c 2511 if (cmd->state_active)
c130480b 2512 target_remove_from_state_list(cmd);
d14921d6 2513
82f1c8a4 2514 if (cmd->se_lun)
c66ac9db 2515 transport_lun_remove_cmd(cmd);
c66ac9db 2516
0f4a9431
NB		 2517 if (!aborted || tas)
2518 ret = transport_put_cmd(cmd);
2519 }
2520 /*
2521 * If the task has been internally aborted due to TMR ABORT_TASK
2522 * or LUN_RESET, target_core_tmr.c is responsible for performing
2523 * the remaining calls to target_put_sess_cmd(), and not the
2524 * callers of this function.
2525 */
2526 if (aborted) {
2527 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2528 wait_for_completion(&cmd->cmd_wait_comp);
2529 cmd->se_tfo->release_cmd(cmd);
2530 ret = 1;
c66ac9db 2531 }
d5ddad41 2532 return ret;
c66ac9db
NB		 2533}
2534EXPORT_SYMBOL(transport_generic_free_cmd);
2535
a17f091d 2536/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2537 * @se_cmd: command descriptor to add
a6360785 2538 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2539 */
afc16604 2540int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2541{
afc16604 2542 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2543 unsigned long flags;
bc187ea6 2544 int ret = 0;
a17f091d 2545
a6360785
NB		 2546 /*
2547 * Add a second kref if the fabric caller is expecting to handle
2548 * fabric acknowledgement that requires two target_put_sess_cmd()
2549 * invocations before se_cmd descriptor release.
2550 */
527268df 2551 if (ack_kref) {
a6360785 2552 kref_get(&se_cmd->cmd_kref);
527268df
NB		 2553 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2554 }
7481deb4 2555
a17f091d 2556 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2557 if (se_sess->sess_tearing_down) {
2558 ret = -ESHUTDOWN;
2559 goto out;
2560 }
a17f091d 2561 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2562out:
a17f091d 2563 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2564
2565 if (ret && ack_kref)
afc16604 2566 target_put_sess_cmd(se_cmd);
7544e597 2567
bc187ea6 2568 return ret;
a17f091d 2569}
20361e69 2570EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2571
febe562c
NB		 2572static void target_free_cmd_mem(struct se_cmd *cmd)
2573{
2574 transport_free_pages(cmd);
2575
2576 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2577 core_tmr_release_req(cmd->se_tmr_req);
2578 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2579 kfree(cmd->t_task_cdb);
2580}
2581
7481deb4 2582static void target_release_cmd_kref(struct kref *kref)
a17f091d 2583{
7481deb4
NB		 2584 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2585 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2586 unsigned long flags;
0f4a9431 2587 bool fabric_stop;
a17f091d 2588
9ff9d15e 2589 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
0f4a9431
NB		 2590
2591 spin_lock(&se_cmd->t_state_lock);
064cdd2d
NB		 2592 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2593 (se_cmd->transport_state & CMD_T_ABORTED);
0f4a9431
NB		 2594 spin_unlock(&se_cmd->t_state_lock);
2595
2596 if (se_cmd->cmd_wait_set || fabric_stop) {
2597 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2598 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
febe562c 2599 target_free_cmd_mem(se_cmd);
a17f091d 2600 complete(&se_cmd->cmd_wait_comp);
7481deb4 2601 return;
a17f091d 2602 }
0f4a9431 2603 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2604 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2605
febe562c 2606 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2607 se_cmd->se_tfo->release_cmd(se_cmd);
2608}
2609
2610/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2611 * @se_cmd: command descriptor to drop
2612 */
afc16604 2613int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2614{
afc16604
BVA		 2615 struct se_session *se_sess = se_cmd->se_sess;
2616
0ed6e189 2617 if (!se_sess) {
febe562c 2618 target_free_cmd_mem(se_cmd);
0ed6e189
NB		 2619 se_cmd->se_tfo->release_cmd(se_cmd);
2620 return 1;
2621 }
9ff9d15e 2622 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2623}
2624EXPORT_SYMBOL(target_put_sess_cmd);
2625
1c7b13fe
RD		 2626/* target_sess_cmd_list_set_waiting - Flag all commands in
2627 * sess_cmd_list to complete cmd_wait_comp. Set
2628 * sess_tearing_down so no more commands are queued.
2629 * @se_sess: session to flag
a17f091d 2630 */
1c7b13fe 2631void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2632{
2633 struct se_cmd *se_cmd;
2634 unsigned long flags;
0f4a9431 2635 int rc;
a17f091d 2636
a17f091d 2637 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2638 if (se_sess->sess_tearing_down) {
2639 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2640 return;
2641 }
1c7b13fe 2642 se_sess->sess_tearing_down = 1;
9b31a328 2643 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2644
0f4a9431
NB		 2645 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) {
2646 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2647 if (rc) {
2648 se_cmd->cmd_wait_set = 1;
2649 spin_lock(&se_cmd->t_state_lock);
2650 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2651 spin_unlock(&se_cmd->t_state_lock);
2652 }
2653 }
a17f091d
NB		 2654
2655 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2656}
1c7b13fe 2657EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2658
2659/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2660 * @se_sess: session to wait for active I/O
a17f091d 2661 */
be646c2d 2662void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2663{
2664 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2665 unsigned long flags;
0f4a9431 2666 bool tas;
a17f091d
NB		 2667
2668 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2669 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2670 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2671 " %d\n", se_cmd, se_cmd->t_state,
2672 se_cmd->se_tfo->get_cmd_state(se_cmd));
2673
0f4a9431
NB		 2674 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2675 tas = (se_cmd->transport_state & CMD_T_TAS);
2676 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2677
2678 if (!target_put_sess_cmd(se_cmd)) {
2679 if (tas)
2680 target_put_sess_cmd(se_cmd);
2681 }
2682
be646c2d
JE		 2683 wait_for_completion(&se_cmd->cmd_wait_comp);
2684 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2685 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2686 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2687
2688 se_cmd->se_tfo->release_cmd(se_cmd);
2689 }
9b31a328
NB		 2690
2691 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2692 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2693 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2694
a17f091d
NB		 2695}
2696EXPORT_SYMBOL(target_wait_for_sess_cmds);
2697
b3eeea66 2698void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2699{
5277797d 2700 percpu_ref_kill(&lun->lun_ref);
5277797d 2701 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2702}
2703
0f4a9431
NB		 2704static bool
2705__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2706 bool *aborted, bool *tas, unsigned long *flags)
2707 __releases(&cmd->t_state_lock)
2708 __acquires(&cmd->t_state_lock)
c66ac9db 2709{
c66ac9db 2710
0f4a9431
NB		 2711 assert_spin_locked(&cmd->t_state_lock);
2712 WARN_ON_ONCE(!irqs_disabled());
2713
2714 if (fabric_stop)
2715 cmd->transport_state |= CMD_T_FABRIC_STOP;
2716
2717 if (cmd->transport_state & CMD_T_ABORTED)
2718 *aborted = true;
2719
2720 if (cmd->transport_state & CMD_T_TAS)
2721 *tas = true;
2722
c8e31f26 2723 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2724 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2725 return false;
cb4f4d3c 2726
c8e31f26 2727 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2728 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2729 return false;
7d680f3b 2730
0f4a9431
NB		 2731 if (!(cmd->transport_state & CMD_T_ACTIVE))
2732 return false;
2733
2734 if (fabric_stop && *aborted)
a17f091d 2735 return false;
c66ac9db 2736
7d680f3b 2737 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2738
0f4a9431
NB		 2739 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2740 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2741 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2742
0f4a9431 2743 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2744
a1d8b49a 2745 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2746
0f4a9431 2747 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2748 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2749
0f4a9431
NB		 2750 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2751 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2752
0f4a9431
NB		 2753 return true;
2754}
2755
2756/**
2757 * transport_wait_for_tasks - wait for completion to occur
2758 * @cmd: command to wait
2759 *
2760 * Called from frontend fabric context to wait for storage engine
2761 * to pause and/or release frontend generated struct se_cmd.
2762 */
2763bool transport_wait_for_tasks(struct se_cmd *cmd)
2764{
2765 unsigned long flags;
2766 bool ret, aborted = false, tas = false;
2767
2768 spin_lock_irqsave(&cmd->t_state_lock, flags);
2769 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 2770 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2771
0f4a9431 2772 return ret;
c66ac9db 2773}
d14921d6 2774EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2775
ab78fef4
BVA		 2776struct sense_info {
2777 u8 key;
2778 u8 asc;
2779 u8 ascq;
2780 bool add_sector_info;
2781};
2782
2783static const struct sense_info sense_info_table[] = {
2784 [TCM_NO_SENSE] = {
2785 .key = NOT_READY
2786 },
2787 [TCM_NON_EXISTENT_LUN] = {
2788 .key = ILLEGAL_REQUEST,
2789 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2790 },
2791 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2792 .key = ILLEGAL_REQUEST,
2793 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2794 },
2795 [TCM_SECTOR_COUNT_TOO_MANY] = {
2796 .key = ILLEGAL_REQUEST,
2797 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2798 },
2799 [TCM_UNKNOWN_MODE_PAGE] = {
2800 .key = ILLEGAL_REQUEST,
2801 .asc = 0x24, /* INVALID FIELD IN CDB */
2802 },
2803 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2804 .key = ABORTED_COMMAND,
2805 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2806 .ascq = 0x03,
2807 },
2808 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2809 .key = ABORTED_COMMAND,
2810 .asc = 0x0c, /* WRITE ERROR */
2811 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2812 },
2813 [TCM_INVALID_CDB_FIELD] = {
2814 .key = ILLEGAL_REQUEST,
2815 .asc = 0x24, /* INVALID FIELD IN CDB */
2816 },
2817 [TCM_INVALID_PARAMETER_LIST] = {
2818 .key = ILLEGAL_REQUEST,
2819 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2820 },
2821 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2822 .key = ILLEGAL_REQUEST,
2823 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2824 },
2825 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2826 .key = ILLEGAL_REQUEST,
2827 .asc = 0x0c, /* WRITE ERROR */
2828 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2829 },
2830 [TCM_SERVICE_CRC_ERROR] = {
2831 .key = ABORTED_COMMAND,
2832 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2833 .ascq = 0x05, /* N/A */
2834 },
2835 [TCM_SNACK_REJECTED] = {
2836 .key = ABORTED_COMMAND,
2837 .asc = 0x11, /* READ ERROR */
2838 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2839 },
2840 [TCM_WRITE_PROTECTED] = {
2841 .key = DATA_PROTECT,
2842 .asc = 0x27, /* WRITE PROTECTED */
2843 },
2844 [TCM_ADDRESS_OUT_OF_RANGE] = {
2845 .key = ILLEGAL_REQUEST,
2846 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2847 },
2848 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2849 .key = UNIT_ATTENTION,
2850 },
2851 [TCM_CHECK_CONDITION_NOT_READY] = {
2852 .key = NOT_READY,
2853 },
2854 [TCM_MISCOMPARE_VERIFY] = {
2855 .key = MISCOMPARE,
2856 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2857 .ascq = 0x00,
2858 },
2859 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2860 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2861 .asc = 0x10,
2862 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2863 .add_sector_info = true,
2864 },
2865 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2866 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2867 .asc = 0x10,
2868 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2869 .add_sector_info = true,
2870 },
2871 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2872 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2873 .asc = 0x10,
2874 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2875 .add_sector_info = true,
2876 },
449a1378
NB		 2877 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
2878 .key = COPY_ABORTED,
2879 .asc = 0x0d,
2880 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
2881
2882 },
ab78fef4
BVA		 2883 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2884 /*
2885 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2886 * Solaris initiators. Returning NOT READY instead means the
2887 * operations will be retried a finite number of times and we
2888 * can survive intermittent errors.
2889 */
2890 .key = NOT_READY,
2891 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2892 },
2893};
2894
f5a8b3a7 2895static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2896{
2897 const struct sense_info *si;
2898 u8 *buffer = cmd->sense_buffer;
2899 int r = (__force int)reason;
2900 u8 asc, ascq;
4e4937e8 2901 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2902
2903 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2904 si = &sense_info_table[r];
2905 else
2906 si = &sense_info_table[(__force int)
2907 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2908
ab78fef4
BVA		 2909 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2910 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2911 WARN_ON_ONCE(asc == 0);
2912 } else if (si->asc == 0) {
2913 WARN_ON_ONCE(cmd->scsi_asc == 0);
2914 asc = cmd->scsi_asc;
2915 ascq = cmd->scsi_ascq;
2916 } else {
2917 asc = si->asc;
2918 ascq = si->ascq;
2919 }
9ec1e1ce 2920
4e4937e8 2921 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 2922 if (si->add_sector_info)
f5a8b3a7
SG		 2923 return scsi_set_sense_information(buffer,
2924 cmd->scsi_sense_length,
2925 cmd->bad_sector);
2926
2927 return 0;
ab78fef4
BVA		 2928}
2929
de103c93
CH		 2930int
2931transport_send_check_condition_and_sense(struct se_cmd *cmd,
2932 sense_reason_t reason, int from_transport)
c66ac9db 2933{
c66ac9db 2934 unsigned long flags;
c66ac9db 2935
a1d8b49a 2936 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2937 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2938 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2939 return 0;
2940 }
2941 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2942 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2943
ab78fef4 2944 if (!from_transport) {
f5a8b3a7
SG		 2945 int rc;
2946
c66ac9db 2947 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 2948 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2949 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 2950 rc = translate_sense_reason(cmd, reason);
2951 if (rc)
2952 return rc;
c66ac9db 2953 }
c66ac9db 2954
e5c0d6ad 2955 trace_target_cmd_complete(cmd);
07bde79a 2956 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2957}
2958EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2959
310d3d31
NB		 2960static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2961 __releases(&cmd->t_state_lock)
2962 __acquires(&cmd->t_state_lock)
c66ac9db 2963{
310d3d31
NB		 2964 assert_spin_locked(&cmd->t_state_lock);
2965 WARN_ON_ONCE(!irqs_disabled());
2966
c18bc7d8
RD		 2967 if (!(cmd->transport_state & CMD_T_ABORTED))
2968 return 0;
68259b5a
AL		 2969 /*
2970 * If cmd has been aborted but either no status is to be sent or it has
2971 * already been sent, just return
2972 */
310d3d31
NB		 2973 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
2974 if (send_status)
2975 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 2976 return 1;
310d3d31 2977 }
8b1e1244 2978
310d3d31
NB		 2979 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
2980 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2981
68259b5a 2982 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2983 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2984 trace_target_cmd_complete(cmd);
310d3d31
NB		 2985
2986 spin_unlock_irq(&cmd->t_state_lock);
c18bc7d8 2987 cmd->se_tfo->queue_status(cmd);
310d3d31 2988 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 2989
2990 return 1;
c66ac9db 2991}
310d3d31
NB		 2992
2993int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2994{
2995 int ret;
2996
2997 spin_lock_irq(&cmd->t_state_lock);
2998 ret = __transport_check_aborted_status(cmd, send_status);
2999 spin_unlock_irq(&cmd->t_state_lock);
3000
3001 return ret;
3002}
c66ac9db
NB		 3003EXPORT_SYMBOL(transport_check_aborted_status);
3004
3005void transport_send_task_abort(struct se_cmd *cmd)
3006{
c252f003
NB		 3007 unsigned long flags;
3008
3009 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 3010 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 3011 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3012 return;
3013 }
3014 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3015
c66ac9db
NB		 3016 /*
3017 * If there are still expected incoming fabric WRITEs, we wait
3018 * until until they have completed before sending a TASK_ABORTED
3019 * response. This response with TASK_ABORTED status will be
3020 * queued back to fabric module by transport_check_aborted_status().
3021 */
3022 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3023 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 3024 spin_lock_irqsave(&cmd->t_state_lock, flags);
3025 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3026 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3027 goto send_abort;
3028 }
68259b5a 3029 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 3030 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 3031 return;
c66ac9db
NB		 3032 }
3033 }
310d3d31 3034send_abort:
c66ac9db 3035 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3036
72b59d6e
RD		 3037 transport_lun_remove_cmd(cmd);
3038
649ee054
BVA		 3039 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3040 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3041
e5c0d6ad 3042 trace_target_cmd_complete(cmd);
e3d6f909 3043 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3044}
3045
af877292 3046static void target_tmr_work(struct work_struct *work)
c66ac9db 3047{
af877292 3048 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3049 struct se_device *dev = cmd->se_dev;
c66ac9db 3050 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 3051 unsigned long flags;
c66ac9db
NB		 3052 int ret;
3053
a6d9bb1c
NB		 3054 spin_lock_irqsave(&cmd->t_state_lock, flags);
3055 if (cmd->transport_state & CMD_T_ABORTED) {
3056 tmr->response = TMR_FUNCTION_REJECTED;
3057 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3058 goto check_stop;
3059 }
3060 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3061
c66ac9db 3062 switch (tmr->function) {
5c6cd613 3063 case TMR_ABORT_TASK:
3d28934a 3064 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3065 break;
5c6cd613
NB		 3066 case TMR_ABORT_TASK_SET:
3067 case TMR_CLEAR_ACA:
3068 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3069 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3070 break;
5c6cd613 3071 case TMR_LUN_RESET:
c66ac9db
NB		 3072 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3073 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3074 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3075 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3076 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3077 cmd->orig_fe_lun, 0x29,
3078 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3079 }
c66ac9db 3080 break;
5c6cd613 3081 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3082 tmr->response = TMR_FUNCTION_REJECTED;
3083 break;
5c6cd613 3084 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3085 tmr->response = TMR_FUNCTION_REJECTED;
3086 break;
c66ac9db 3087 default:
6708bb27 3088 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3089 tmr->function);
3090 tmr->response = TMR_FUNCTION_REJECTED;
3091 break;
3092 }
3093
a6d9bb1c
NB		 3094 spin_lock_irqsave(&cmd->t_state_lock, flags);
3095 if (cmd->transport_state & CMD_T_ABORTED) {
3096 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3097 goto check_stop;
3098 }
c66ac9db 3099 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
a6d9bb1c
NB		 3100 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3101
e3d6f909 3102 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3103
a6d9bb1c 3104check_stop:
b7b8bef7 3105 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3106}
3107
af877292
CH		 3108int transport_generic_handle_tmr(
3109 struct se_cmd *cmd)
c66ac9db 3110{
f15e9cd9
NB		 3111 unsigned long flags;
3112
3113 spin_lock_irqsave(&cmd->t_state_lock, flags);
3114 cmd->transport_state |= CMD_T_ACTIVE;
3115 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3116
af877292
CH		 3117 INIT_WORK(&cmd->work, target_tmr_work);
3118 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3119 return 0;
3120}
af877292 3121EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3122
3123bool
3124target_check_wce(struct se_device *dev)
3125{
3126 bool wce = false;
3127
3128 if (dev->transport->get_write_cache)
3129 wce = dev->transport->get_write_cache(dev);
3130 else if (dev->dev_attrib.emulate_write_cache > 0)
3131 wce = true;
3132
3133 return wce;
3134}
3135
3136bool
3137target_check_fua(struct se_device *dev)
3138{
3139 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3140}
Linux 6.x block layer and io_uring tree(s)