]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - drivers/target/target_core_transport.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
target: Fix max_unmap_lba_count calc overflow
[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
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{
757 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
758 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
759 cmd->residual_count += cmd->data_length - length;
760 } else {
761 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
762 cmd->residual_count = cmd->data_length - length;
763 }
764
765 cmd->data_length = length;
766 }
767
768 target_complete_cmd(cmd, scsi_status);
769}
770EXPORT_SYMBOL(target_complete_cmd_with_length);
771
cf572a96 772static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 773{
cf572a96
CH		 774 struct se_device *dev = cmd->se_dev;
775 unsigned long flags;
c66ac9db 776
cf572a96
CH		 777 spin_lock_irqsave(&dev->execute_task_lock, flags);
778 if (!cmd->state_active) {
779 list_add_tail(&cmd->state_list, &dev->state_list);
780 cmd->state_active = true;
c66ac9db 781 }
cf572a96 782 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 783}
784
07bde79a 785/*
f147abb4 786 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 787 */
7a6f0a1e
CH		 788static void transport_write_pending_qf(struct se_cmd *cmd);
789static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 790
0fd97ccf 791void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 792{
793 struct se_device *dev = container_of(work, struct se_device,
794 qf_work_queue);
bcac364a 795 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 796 struct se_cmd *cmd, *cmd_tmp;
797
798 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 799 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
800 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 801
bcac364a 802 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 803 list_del(&cmd->se_qf_node);
33940d09 804 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 805
6708bb27 806 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 807 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 808 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 809 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
810 : "UNKNOWN");
f7a5cc0b 811
7a6f0a1e
CH		 812 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
813 transport_write_pending_qf(cmd);
814 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
815 transport_complete_qf(cmd);
07bde79a 816 }
07bde79a
NB		 817}
818
c66ac9db
NB		 819unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
820{
821 switch (cmd->data_direction) {
822 case DMA_NONE:
823 return "NONE";
824 case DMA_FROM_DEVICE:
825 return "READ";
826 case DMA_TO_DEVICE:
827 return "WRITE";
828 case DMA_BIDIRECTIONAL:
829 return "BIDI";
830 default:
831 break;
832 }
833
834 return "UNKNOWN";
835}
836
837void transport_dump_dev_state(
838 struct se_device *dev,
839 char *b,
840 int *bl)
841{
842 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 843 if (dev->export_count)
c66ac9db 844 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 845 else
c66ac9db 846 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 847
5f41a31d 848 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 849 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 850 dev->dev_attrib.block_size,
851 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 852 *bl += sprintf(b + *bl, " ");
853}
854
c66ac9db
NB		 855void transport_dump_vpd_proto_id(
856 struct t10_vpd *vpd,
857 unsigned char *p_buf,
858 int p_buf_len)
859{
860 unsigned char buf[VPD_TMP_BUF_SIZE];
861 int len;
862
863 memset(buf, 0, VPD_TMP_BUF_SIZE);
864 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
865
866 switch (vpd->protocol_identifier) {
867 case 0x00:
868 sprintf(buf+len, "Fibre Channel\n");
869 break;
870 case 0x10:
871 sprintf(buf+len, "Parallel SCSI\n");
872 break;
873 case 0x20:
874 sprintf(buf+len, "SSA\n");
875 break;
876 case 0x30:
877 sprintf(buf+len, "IEEE 1394\n");
878 break;
879 case 0x40:
880 sprintf(buf+len, "SCSI Remote Direct Memory Access"
881 " Protocol\n");
882 break;
883 case 0x50:
884 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
885 break;
886 case 0x60:
887 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
888 break;
889 case 0x70:
890 sprintf(buf+len, "Automation/Drive Interface Transport"
891 " Protocol\n");
892 break;
893 case 0x80:
894 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
895 break;
896 default:
897 sprintf(buf+len, "Unknown 0x%02x\n",
898 vpd->protocol_identifier);
899 break;
900 }
901
902 if (p_buf)
903 strncpy(p_buf, buf, p_buf_len);
904 else
6708bb27 905 pr_debug("%s", buf);
c66ac9db
NB		 906}
907
908void
909transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
910{
911 /*
912 * Check if the Protocol Identifier Valid (PIV) bit is set..
913 *
914 * from spc3r23.pdf section 7.5.1
915 */
916 if (page_83[1] & 0x80) {
917 vpd->protocol_identifier = (page_83[0] & 0xf0);
918 vpd->protocol_identifier_set = 1;
919 transport_dump_vpd_proto_id(vpd, NULL, 0);
920 }
921}
922EXPORT_SYMBOL(transport_set_vpd_proto_id);
923
924int transport_dump_vpd_assoc(
925 struct t10_vpd *vpd,
926 unsigned char *p_buf,
927 int p_buf_len)
928{
929 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 930 int ret = 0;
931 int len;
c66ac9db
NB		 932
933 memset(buf, 0, VPD_TMP_BUF_SIZE);
934 len = sprintf(buf, "T10 VPD Identifier Association: ");
935
936 switch (vpd->association) {
937 case 0x00:
938 sprintf(buf+len, "addressed logical unit\n");
939 break;
940 case 0x10:
941 sprintf(buf+len, "target port\n");
942 break;
943 case 0x20:
944 sprintf(buf+len, "SCSI target device\n");
945 break;
946 default:
947 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 948 ret = -EINVAL;
c66ac9db
NB		 949 break;
950 }
951
952 if (p_buf)
953 strncpy(p_buf, buf, p_buf_len);
954 else
6708bb27 955 pr_debug("%s", buf);
c66ac9db
NB		 956
957 return ret;
958}
959
960int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
961{
962 /*
963 * The VPD identification association..
964 *
965 * from spc3r23.pdf Section 7.6.3.1 Table 297
966 */
967 vpd->association = (page_83[1] & 0x30);
968 return transport_dump_vpd_assoc(vpd, NULL, 0);
969}
970EXPORT_SYMBOL(transport_set_vpd_assoc);
971
972int transport_dump_vpd_ident_type(
973 struct t10_vpd *vpd,
974 unsigned char *p_buf,
975 int p_buf_len)
976{
977 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 978 int ret = 0;
979 int len;
c66ac9db
NB		 980
981 memset(buf, 0, VPD_TMP_BUF_SIZE);
982 len = sprintf(buf, "T10 VPD Identifier Type: ");
983
984 switch (vpd->device_identifier_type) {
985 case 0x00:
986 sprintf(buf+len, "Vendor specific\n");
987 break;
988 case 0x01:
989 sprintf(buf+len, "T10 Vendor ID based\n");
990 break;
991 case 0x02:
992 sprintf(buf+len, "EUI-64 based\n");
993 break;
994 case 0x03:
995 sprintf(buf+len, "NAA\n");
996 break;
997 case 0x04:
998 sprintf(buf+len, "Relative target port identifier\n");
999 break;
1000 case 0x08:
1001 sprintf(buf+len, "SCSI name string\n");
1002 break;
1003 default:
1004 sprintf(buf+len, "Unsupported: 0x%02x\n",
1005 vpd->device_identifier_type);
e3d6f909 1006 ret = -EINVAL;
c66ac9db
NB		 1007 break;
1008 }
1009
e3d6f909
AG		 1010 if (p_buf) {
1011 if (p_buf_len < strlen(buf)+1)
1012 return -EINVAL;
c66ac9db 1013 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1014 } else {
6708bb27 1015 pr_debug("%s", buf);
e3d6f909 1016 }
c66ac9db
NB		 1017
1018 return ret;
1019}
1020
1021int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1022{
1023 /*
1024 * The VPD identifier type..
1025 *
1026 * from spc3r23.pdf Section 7.6.3.1 Table 298
1027 */
1028 vpd->device_identifier_type = (page_83[1] & 0x0f);
1029 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1030}
1031EXPORT_SYMBOL(transport_set_vpd_ident_type);
1032
1033int transport_dump_vpd_ident(
1034 struct t10_vpd *vpd,
1035 unsigned char *p_buf,
1036 int p_buf_len)
1037{
1038 unsigned char buf[VPD_TMP_BUF_SIZE];
1039 int ret = 0;
1040
1041 memset(buf, 0, VPD_TMP_BUF_SIZE);
1042
1043 switch (vpd->device_identifier_code_set) {
1044 case 0x01: /* Binary */
703d641d
DC		 1045 snprintf(buf, sizeof(buf),
1046 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1047 &vpd->device_identifier[0]);
1048 break;
1049 case 0x02: /* ASCII */
703d641d
DC		 1050 snprintf(buf, sizeof(buf),
1051 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1052 &vpd->device_identifier[0]);
1053 break;
1054 case 0x03: /* UTF-8 */
703d641d
DC		 1055 snprintf(buf, sizeof(buf),
1056 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1057 &vpd->device_identifier[0]);
1058 break;
1059 default:
1060 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1061 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1062 ret = -EINVAL;
c66ac9db
NB		 1063 break;
1064 }
1065
1066 if (p_buf)
1067 strncpy(p_buf, buf, p_buf_len);
1068 else
6708bb27 1069 pr_debug("%s", buf);
c66ac9db
NB		 1070
1071 return ret;
1072}
1073
1074int
1075transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1076{
1077 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1078 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1079
1080 /*
1081 * The VPD Code Set (encoding)
1082 *
1083 * from spc3r23.pdf Section 7.6.3.1 Table 296
1084 */
1085 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1086 switch (vpd->device_identifier_code_set) {
1087 case 0x01: /* Binary */
1088 vpd->device_identifier[j++] =
1089 hex_str[vpd->device_identifier_type];
1090 while (i < (4 + page_83[3])) {
1091 vpd->device_identifier[j++] =
1092 hex_str[(page_83[i] & 0xf0) >> 4];
1093 vpd->device_identifier[j++] =
1094 hex_str[page_83[i] & 0x0f];
1095 i++;
1096 }
1097 break;
1098 case 0x02: /* ASCII */
1099 case 0x03: /* UTF-8 */
1100 while (i < (4 + page_83[3]))
1101 vpd->device_identifier[j++] = page_83[i++];
1102 break;
1103 default:
1104 break;
1105 }
1106
1107 return transport_dump_vpd_ident(vpd, NULL, 0);
1108}
1109EXPORT_SYMBOL(transport_set_vpd_ident);
1110
8f9b5654
NB		 1111static sense_reason_t
1112target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1113 unsigned int size)
1114{
1115 u32 mtl;
1116
1117 if (!cmd->se_tfo->max_data_sg_nents)
1118 return TCM_NO_SENSE;
1119 /*
1120 * Check if fabric enforced maximum SGL entries per I/O descriptor
1121 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1122 * residual_count and reduce original cmd->data_length to maximum
1123 * length based on single PAGE_SIZE entry scatter-lists.
1124 */
1125 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1126 if (cmd->data_length > mtl) {
1127 /*
1128 * If an existing CDB overflow is present, calculate new residual
1129 * based on CDB size minus fabric maximum transfer length.
1130 *
1131 * If an existing CDB underflow is present, calculate new residual
1132 * based on original cmd->data_length minus fabric maximum transfer
1133 * length.
1134 *
1135 * Otherwise, set the underflow residual based on cmd->data_length
1136 * minus fabric maximum transfer length.
1137 */
1138 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1139 cmd->residual_count = (size - mtl);
1140 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1141 u32 orig_dl = size + cmd->residual_count;
1142 cmd->residual_count = (orig_dl - mtl);
1143 } else {
1144 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1145 cmd->residual_count = (cmd->data_length - mtl);
1146 }
1147 cmd->data_length = mtl;
1148 /*
1149 * Reset sbc_check_prot() calculated protection payload
1150 * length based upon the new smaller MTL.
1151 */
1152 if (cmd->prot_length) {
1153 u32 sectors = (mtl / dev->dev_attrib.block_size);
1154 cmd->prot_length = dev->prot_length * sectors;
1155 }
1156 }
1157 return TCM_NO_SENSE;
1158}
1159
de103c93
CH		 1160sense_reason_t
1161target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1162{
1163 struct se_device *dev = cmd->se_dev;
1164
1165 if (cmd->unknown_data_length) {
1166 cmd->data_length = size;
1167 } else if (size != cmd->data_length) {
1168 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1169 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1170 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1171 cmd->data_length, size, cmd->t_task_cdb[0]);
1172
c72c5250
RD		 1173 if (cmd->data_direction == DMA_TO_DEVICE &&
1174 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1175 pr_err("Rejecting underflow/overflow WRITE data\n");
de103c93 1176 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1177 }
1178 /*
1179 * Reject READ_* or WRITE_* with overflow/underflow for
1180 * type SCF_SCSI_DATA_CDB.
1181 */
0fd97ccf 1182 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1183 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1184 " CDB on non 512-byte sector setup subsystem"
1185 " plugin: %s\n", dev->transport->name);
1186 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1187 return TCM_INVALID_CDB_FIELD;
9b3b8041 1188 }
4c054ba6
NB		 1189 /*
1190 * For the overflow case keep the existing fabric provided
1191 * ->data_length. Otherwise for the underflow case, reset
1192 * ->data_length to the smaller SCSI expected data transfer
1193 * length.
1194 */
9b3b8041
CH		 1195 if (size > cmd->data_length) {
1196 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1197 cmd->residual_count = (size - cmd->data_length);
1198 } else {
1199 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1200 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1201 cmd->data_length = size;
9b3b8041 1202 }
9b3b8041
CH		 1203 }
1204
8f9b5654 1205 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1206
9b3b8041
CH		 1207}
1208
c66ac9db
NB		 1209/*
1210 * Used by fabric modules containing a local struct se_cmd within their
1211 * fabric dependent per I/O descriptor.
649ee054
BVA		 1212 *
1213 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1214 */
1215void transport_init_se_cmd(
1216 struct se_cmd *cmd,
9ac8928e 1217 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1218 struct se_session *se_sess,
1219 u32 data_length,
1220 int data_direction,
1221 int task_attr,
1222 unsigned char *sense_buffer)
1223{
5951146d 1224 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1225 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1226 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1227 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1228 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1229 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1230 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1231 kref_init(&cmd->cmd_kref);
7d680f3b 1232 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1233
1234 cmd->se_tfo = tfo;
1235 cmd->se_sess = se_sess;
1236 cmd->data_length = data_length;
1237 cmd->data_direction = data_direction;
1238 cmd->sam_task_attr = task_attr;
1239 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1240
1241 cmd->state_active = false;
c66ac9db
NB		 1242}
1243EXPORT_SYMBOL(transport_init_se_cmd);
1244
de103c93
CH		 1245static sense_reason_t
1246transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1247{
019c4ca6
CH		 1248 struct se_device *dev = cmd->se_dev;
1249
c66ac9db
NB		 1250 /*
1251 * Check if SAM Task Attribute emulation is enabled for this
1252 * struct se_device storage object
1253 */
a3541703 1254 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1255 return 0;
1256
68d81f40 1257 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1258 pr_debug("SAM Task Attribute ACA"
c66ac9db 1259 " emulation is not supported\n");
de103c93 1260 return TCM_INVALID_CDB_FIELD;
c66ac9db 1261 }
9c31820b 1262
c66ac9db
NB		 1263 return 0;
1264}
1265
de103c93
CH		 1266sense_reason_t
1267target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1268{
0fd97ccf 1269 struct se_device *dev = cmd->se_dev;
de103c93 1270 sense_reason_t ret;
c66ac9db 1271
c66ac9db
NB		 1272 /*
1273 * Ensure that the received CDB is less than the max (252 + 8) bytes
1274 * for VARIABLE_LENGTH_CMD
1275 */
1276 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1277 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1278 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1279 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1280 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1281 }
1282 /*
1283 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1284 * allocate the additional extended CDB buffer now.. Otherwise
1285 * setup the pointer from __t_task_cdb to t_task_cdb.
1286 */
a1d8b49a
AG		 1287 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1288 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1289 GFP_KERNEL);
6708bb27
AG		 1290 if (!cmd->t_task_cdb) {
1291 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1292 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1293 scsi_command_size(cdb),
a1d8b49a 1294 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1295 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1296 }
1297 } else
a1d8b49a 1298 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1299 /*
a1d8b49a 1300 * Copy the original CDB into cmd->
c66ac9db 1301 */
a1d8b49a 1302 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1303
e5c0d6ad
RD		 1304 trace_target_sequencer_start(cmd);
1305
cb4f4d3c
CH		 1306 /*
1307 * Check for an existing UNIT ATTENTION condition
1308 */
de103c93
CH		 1309 ret = target_scsi3_ua_check(cmd);
1310 if (ret)
1311 return ret;
cb4f4d3c 1312
c87fbd56 1313 ret = target_alua_state_check(cmd);
de103c93
CH		 1314 if (ret)
1315 return ret;
cb4f4d3c 1316
d977f437 1317 ret = target_check_reservation(cmd);
f85eda8d
NB		 1318 if (ret) {
1319 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1320 return ret;
f85eda8d 1321 }
cb4f4d3c 1322
0fd97ccf 1323 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1324 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1325 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1326 cmd->se_tfo->get_fabric_name(),
1327 cmd->se_sess->se_node_acl->initiatorname,
1328 cmd->t_task_cdb[0]);
de103c93
CH		 1329 if (ret)
1330 return ret;
1331
1332 ret = transport_check_alloc_task_attr(cmd);
1333 if (ret)
c66ac9db 1334 return ret;
cb4f4d3c 1335
cb4f4d3c 1336 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1337 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1338 return 0;
1339}
a12f41f8 1340EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1341
695434e1
NB		 1342/*
1343 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1344 * May only be used from process context.
695434e1
NB		 1345 */
1346int transport_handle_cdb_direct(
1347 struct se_cmd *cmd)
1348{
de103c93 1349 sense_reason_t ret;
dd8ae59d 1350
695434e1
NB		 1351 if (!cmd->se_lun) {
1352 dump_stack();
6708bb27 1353 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1354 return -EINVAL;
1355 }
1356 if (in_interrupt()) {
1357 dump_stack();
6708bb27 1358 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1359 " from interrupt context\n");
1360 return -EINVAL;
1361 }
dd8ae59d 1362 /*
af877292
CH		 1363 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1364 * outstanding descriptors are handled correctly during shutdown via
1365 * transport_wait_for_tasks()
dd8ae59d
NB		 1366 *
1367 * Also, we don't take cmd->t_state_lock here as we only expect
1368 * this to be called for initial descriptor submission.
1369 */
1370 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1371 cmd->transport_state |= CMD_T_ACTIVE;
1372
dd8ae59d
NB		 1373 /*
1374 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1375 * so follow TRANSPORT_NEW_CMD processing thread context usage
1376 * and call transport_generic_request_failure() if necessary..
1377 */
1378 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1379 if (ret)
1380 transport_generic_request_failure(cmd, ret);
dd8ae59d 1381 return 0;
695434e1
NB		 1382}
1383EXPORT_SYMBOL(transport_handle_cdb_direct);
1384
c5ff8d6b 1385sense_reason_t
de103c93
CH		 1386transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1387 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1388{
1389 if (!sgl || !sgl_count)
1390 return 0;
1391
1392 /*
1393 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1394 * scatterlists already have been set to follow what the fabric
1395 * passes for the original expected data transfer length.
1396 */
1397 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1398 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1399 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1400 return TCM_INVALID_CDB_FIELD;
1401 }
1402
1403 cmd->t_data_sg = sgl;
1404 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1405 cmd->t_bidi_data_sg = sgl_bidi;
1406 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1407
de103c93
CH		 1408 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1409 return 0;
1410}
1411
a026757f
NB		 1412/*
1413 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1414 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1415 *
1416 * @se_cmd: command descriptor to submit
1417 * @se_sess: associated se_sess for endpoint
1418 * @cdb: pointer to SCSI CDB
1419 * @sense: pointer to SCSI sense buffer
1420 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1421 * @data_length: fabric expected data transfer length
1422 * @task_addr: SAM task attribute
1423 * @data_dir: DMA data direction
1424 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1425 * @sgl: struct scatterlist memory for unidirectional mapping
1426 * @sgl_count: scatterlist count for unidirectional mapping
1427 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1428 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1429 * @sgl_prot: struct scatterlist memory protection information
1430 * @sgl_prot_count: scatterlist count for protection information
a6360785 1431 *
649ee054
BVA		 1432 * Task tags are supported if the caller has set @se_cmd->tag.
1433 *
d6dfc868
RD		 1434 * Returns non zero to signal active I/O shutdown failure. All other
1435 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1436 * but still return zero here.
1437 *
a6360785
NB		 1438 * This may only be called from process context, and also currently
1439 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1440 */
1441int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1442 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1443 u32 data_length, int task_attr, int data_dir, int flags,
1444 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1445 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1446 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1447{
1448 struct se_portal_group *se_tpg;
de103c93
CH		 1449 sense_reason_t rc;
1450 int ret;
a6360785
NB		 1451
1452 se_tpg = se_sess->se_tpg;
1453 BUG_ON(!se_tpg);
1454 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1455 BUG_ON(in_interrupt());
1456 /*
1457 * Initialize se_cmd for target operation. From this point
1458 * exceptions are handled by sending exception status via
1459 * target_core_fabric_ops->queue_status() callback
1460 */
1461 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1462 data_length, data_dir, task_attr, sense);
9095adaa
QT		 1463
1464 if (flags & TARGET_SCF_USE_CPUID)
1465 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1466 else
1467 se_cmd->cpuid = WORK_CPU_UNBOUND;
1468
b0d79946
SAS		 1469 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1470 se_cmd->unknown_data_length = 1;
a6360785
NB		 1471 /*
1472 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1473 * se_sess->sess_cmd_list. A second kref_get here is necessary
1474 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1475 * kref_put() to happen during fabric packet acknowledgement.
1476 */
afc16604 1477 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1478 if (ret)
1479 return ret;
a6360785
NB		 1480 /*
1481 * Signal bidirectional data payloads to target-core
1482 */
1483 if (flags & TARGET_SCF_BIDI_OP)
1484 se_cmd->se_cmd_flags |= SCF_BIDI;
1485 /*
1486 * Locate se_lun pointer and attach it to struct se_cmd
1487 */
de103c93
CH		 1488 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1489 if (rc) {
1490 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1491 target_put_sess_cmd(se_cmd);
d6dfc868 1492 return 0;
735703ca 1493 }
b5b8e298
SG		 1494
1495 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1496 if (rc != 0) {
1497 transport_generic_request_failure(se_cmd, rc);
1498 return 0;
1499 }
1500
def2b339
NB		 1501 /*
1502 * Save pointers for SGLs containing protection information,
1503 * if present.
1504 */
1505 if (sgl_prot_count) {
1506 se_cmd->t_prot_sg = sgl_prot;
1507 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1508 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1509 }
d6e0175c 1510
a026757f
NB		 1511 /*
1512 * When a non zero sgl_count has been passed perform SGL passthrough
1513 * mapping for pre-allocated fabric memory instead of having target
1514 * core perform an internal SGL allocation..
1515 */
1516 if (sgl_count != 0) {
1517 BUG_ON(!sgl);
1518
944981c7
NB		 1519 /*
1520 * A work-around for tcm_loop as some userspace code via
1521 * scsi-generic do not memset their associated read buffers,
1522 * so go ahead and do that here for type non-data CDBs. Also
1523 * note that this is currently guaranteed to be a single SGL
1524 * for this case by target core in target_setup_cmd_from_cdb()
1525 * -> transport_generic_cmd_sequencer().
1526 */
1527 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1528 se_cmd->data_direction == DMA_FROM_DEVICE) {
1529 unsigned char *buf = NULL;
1530
1531 if (sgl)
1532 buf = kmap(sg_page(sgl)) + sgl->offset;
1533
1534 if (buf) {
1535 memset(buf, 0, sgl->length);
1536 kunmap(sg_page(sgl));
1537 }
1538 }
1539
a026757f
NB		 1540 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1541 sgl_bidi, sgl_bidi_count);
1542 if (rc != 0) {
de103c93 1543 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1544 return 0;
1545 }
1546 }
def2b339 1547
11e319ed
AG		 1548 /*
1549 * Check if we need to delay processing because of ALUA
1550 * Active/NonOptimized primary access state..
1551 */
1552 core_alua_check_nonop_delay(se_cmd);
1553
a6360785 1554 transport_handle_cdb_direct(se_cmd);
d6dfc868 1555 return 0;
a6360785 1556}
a026757f
NB		 1557EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1558
1559/*
1560 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1561 *
1562 * @se_cmd: command descriptor to submit
1563 * @se_sess: associated se_sess for endpoint
1564 * @cdb: pointer to SCSI CDB
1565 * @sense: pointer to SCSI sense buffer
1566 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1567 * @data_length: fabric expected data transfer length
1568 * @task_addr: SAM task attribute
1569 * @data_dir: DMA data direction
1570 * @flags: flags for command submission from target_sc_flags_tables
1571 *
649ee054
BVA		 1572 * Task tags are supported if the caller has set @se_cmd->tag.
1573 *
a026757f
NB		 1574 * Returns non zero to signal active I/O shutdown failure. All other
1575 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1576 * but still return zero here.
1577 *
1578 * This may only be called from process context, and also currently
1579 * assumes internal allocation of fabric payload buffer by target-core.
1580 *
1581 * It also assumes interal target core SGL memory allocation.
1582 */
1583int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1584 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1585 u32 data_length, int task_attr, int data_dir, int flags)
1586{
1587 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1588 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1589 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1590}
a6360785
NB		 1591EXPORT_SYMBOL(target_submit_cmd);
1592
9f0d05c2
NB		 1593static void target_complete_tmr_failure(struct work_struct *work)
1594{
1595 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1596
1597 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1598 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1599
1600 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1601}
1602
ea98d7f9
AG		 1603/**
1604 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1605 * for TMR CDBs
1606 *
1607 * @se_cmd: command descriptor to submit
1608 * @se_sess: associated se_sess for endpoint
1609 * @sense: pointer to SCSI sense buffer
1610 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1611 * @fabric_context: fabric context for TMR req
1612 * @tm_type: Type of TM request
c0974f89
NB		 1613 * @gfp: gfp type for caller
1614 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1615 * @flags: submit cmd flags
ea98d7f9
AG		 1616 *
1617 * Callable from all contexts.
1618 **/
1619
c7042cae 1620int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1621 unsigned char *sense, u64 unpacked_lun,
c0974f89 1622 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1623 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1624{
1625 struct se_portal_group *se_tpg;
1626 int ret;
1627
1628 se_tpg = se_sess->se_tpg;
1629 BUG_ON(!se_tpg);
1630
1631 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1632 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1633 /*
1634 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1635 * allocation failure.
1636 */
c0974f89 1637 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1638 if (ret < 0)
1639 return -ENOMEM;
ea98d7f9 1640
c0974f89
NB		 1641 if (tm_type == TMR_ABORT_TASK)
1642 se_cmd->se_tmr_req->ref_task_tag = tag;
1643
ea98d7f9 1644 /* See target_submit_cmd for commentary */
afc16604 1645 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1646 if (ret) {
1647 core_tmr_release_req(se_cmd->se_tmr_req);
1648 return ret;
1649 }
ea98d7f9 1650
ea98d7f9
AG		 1651 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1652 if (ret) {
9f0d05c2
NB		 1653 /*
1654 * For callback during failure handling, push this work off
1655 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1656 */
1657 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1658 schedule_work(&se_cmd->work);
c7042cae 1659 return 0;
ea98d7f9
AG		 1660 }
1661 transport_generic_handle_tmr(se_cmd);
c7042cae 1662 return 0;
ea98d7f9
AG		 1663}
1664EXPORT_SYMBOL(target_submit_tmr);
1665
c66ac9db
NB		 1666/*
1667 * Handle SAM-esque emulation for generic transport request failures.
1668 */
de103c93
CH		 1669void transport_generic_request_failure(struct se_cmd *cmd,
1670 sense_reason_t sense_reason)
c66ac9db 1671{
057085e5 1672 int ret = 0, post_ret = 0;
07bde79a 1673
649ee054
BVA		 1674 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1675 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1676 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1677 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1678 cmd->t_state, sense_reason);
d43d6aea 1679 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1680 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1681 (cmd->transport_state & CMD_T_STOP) != 0,
1682 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1683
c66ac9db
NB		 1684 /*
1685 * For SAM Task Attribute emulation for failed struct se_cmd
1686 */
019c4ca6 1687 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1688 /*
1689 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1690 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1691 */
1692 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1693 cmd->transport_complete_callback)
057085e5 1694 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1695
de103c93 1696 switch (sense_reason) {
03e98c9e
NB		 1697 case TCM_NON_EXISTENT_LUN:
1698 case TCM_UNSUPPORTED_SCSI_OPCODE:
1699 case TCM_INVALID_CDB_FIELD:
1700 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1701 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1702 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1703 case TCM_UNKNOWN_MODE_PAGE:
1704 case TCM_WRITE_PROTECTED:
e2397c70 1705 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1706 case TCM_CHECK_CONDITION_ABORT_CMD:
1707 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1708 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1709 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1710 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1711 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1712 break;
de103c93
CH		 1713 case TCM_OUT_OF_RESOURCES:
1714 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1715 break;
03e98c9e 1716 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1717 /*
1718 * No SENSE Data payload for this case, set SCSI Status
1719 * and queue the response to $FABRIC_MOD.
1720 *
1721 * Uses linux/include/scsi/scsi.h SAM status codes defs
1722 */
1723 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1724 /*
1725 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1726 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1727 * CONFLICT STATUS.
1728 *
1729 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1730 */
e3d6f909 1731 if (cmd->se_sess &&
c51c8e7b
HR		 1732 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1733 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1734 cmd->orig_fe_lun, 0x2C,
1735 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1736 }
e5c0d6ad 1737 trace_target_cmd_complete(cmd);
c51c8e7b 1738 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1739 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1740 goto queue_full;
c66ac9db 1741 goto check_stop;
c66ac9db 1742 default:
6708bb27 1743 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1744 cmd->t_task_cdb[0], sense_reason);
1745 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1746 break;
1747 }
f3146437 1748
de103c93 1749 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1750 if (ret == -EAGAIN || ret == -ENOMEM)
1751 goto queue_full;
07bde79a 1752
c66ac9db
NB		 1753check_stop:
1754 transport_lun_remove_cmd(cmd);
06b967e4 1755 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1756 return;
1757
1758queue_full:
e057f533
CH		 1759 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1760 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1761}
2fbff127 1762EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1763
76dde50e 1764void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1765{
de103c93 1766 sense_reason_t ret;
5f41a31d 1767
de103c93
CH		 1768 if (cmd->execute_cmd) {
1769 ret = cmd->execute_cmd(cmd);
1770 if (ret) {
1771 spin_lock_irq(&cmd->t_state_lock);
1772 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1773 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1774
de103c93
CH		 1775 transport_generic_request_failure(cmd, ret);
1776 }
5f41a31d
CH		 1777 }
1778}
1779
aa58b531
NB		 1780static int target_write_prot_action(struct se_cmd *cmd)
1781{
5132d1e6 1782 u32 sectors;
aa58b531
NB		 1783 /*
1784 * Perform WRITE_INSERT of PI using software emulation when backend
1785 * device has PI enabled, if the transport has not already generated
1786 * PI using hardware WRITE_INSERT offload.
1787 */
1788 switch (cmd->prot_op) {
1789 case TARGET_PROT_DOUT_INSERT:
1790 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1791 sbc_dif_generate(cmd);
1792 break;
5132d1e6
NB		 1793 case TARGET_PROT_DOUT_STRIP:
1794 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1795 break;
1796
1797 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1798 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1799 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1800 if (unlikely(cmd->pi_err)) {
1801 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1802 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1803 spin_unlock_irq(&cmd->t_state_lock);
1804 transport_generic_request_failure(cmd, cmd->pi_err);
1805 return -1;
1806 }
1807 break;
aa58b531
NB		 1808 default:
1809 break;
1810 }
1811
1812 return 0;
1813}
1814
019c4ca6 1815static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1816{
1817 struct se_device *dev = cmd->se_dev;
1818
a3541703 1819 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1820 return false;
5f41a31d 1821
c66ac9db 1822 /*
25985edc 1823 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1824 * to allow the passed struct se_cmd list of tasks to the front of the list.
1825 */
5f41a31d 1826 switch (cmd->sam_task_attr) {
68d81f40 1827 case TCM_HEAD_TAG:
9c31820b
RD		 1828 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1829 cmd->t_task_cdb[0]);
019c4ca6 1830 return false;
68d81f40 1831 case TCM_ORDERED_TAG:
33940d09 1832 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1833
9c31820b
RD		 1834 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1835 cmd->t_task_cdb[0]);
5f41a31d 1836
c66ac9db 1837 /*
5f41a31d
CH		 1838 * Execute an ORDERED command if no other older commands
1839 * exist that need to be completed first.
c66ac9db 1840 */
5f41a31d 1841 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1842 return false;
5f41a31d
CH		 1843 break;
1844 default:
c66ac9db
NB		 1845 /*
1846 * For SIMPLE and UNTAGGED Task Attribute commands
1847 */
33940d09 1848 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1849 break;
c66ac9db 1850 }
5f41a31d 1851
019c4ca6
CH		 1852 if (atomic_read(&dev->dev_ordered_sync) == 0)
1853 return false;
c66ac9db 1854
019c4ca6
CH		 1855 spin_lock(&dev->delayed_cmd_lock);
1856 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1857 spin_unlock(&dev->delayed_cmd_lock);
1858
9c31820b
RD		 1859 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1860 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1861 return true;
1862}
1863
310d3d31
NB		 1864static int __transport_check_aborted_status(struct se_cmd *, int);
1865
019c4ca6
CH		 1866void target_execute_cmd(struct se_cmd *cmd)
1867{
019c4ca6
CH		 1868 /*
1869 * Determine if frontend context caller is requesting the stopping of
1870 * this command for frontend exceptions.
310d3d31
NB		 1871 *
1872 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1873 */
4a9a6c8d 1874 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1875 if (__transport_check_aborted_status(cmd, 1)) {
1876 spin_unlock_irq(&cmd->t_state_lock);
1877 return;
1878 }
019c4ca6 1879 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1880 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1881 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1882
1883 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1884 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1885 return;
1886 }
1887
1888 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1889 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1890 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1891
1892 if (target_write_prot_action(cmd))
1893 return;
019c4ca6 1894
1a398b97
NB		 1895 if (target_handle_task_attr(cmd)) {
1896 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1897 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1898 spin_unlock_irq(&cmd->t_state_lock);
1899 return;
1900 }
1901
1902 __target_execute_cmd(cmd);
c66ac9db 1903}
70baf0ab 1904EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1905
5f41a31d
CH		 1906/*
1907 * Process all commands up to the last received ORDERED task attribute which
1908 * requires another blocking boundary
1909 */
1910static void target_restart_delayed_cmds(struct se_device *dev)
1911{
1912 for (;;) {
1913 struct se_cmd *cmd;
1914
1915 spin_lock(&dev->delayed_cmd_lock);
1916 if (list_empty(&dev->delayed_cmd_list)) {
1917 spin_unlock(&dev->delayed_cmd_lock);
1918 break;
1919 }
1920
1921 cmd = list_entry(dev->delayed_cmd_list.next,
1922 struct se_cmd, se_delayed_node);
1923 list_del(&cmd->se_delayed_node);
1924 spin_unlock(&dev->delayed_cmd_lock);
1925
1926 __target_execute_cmd(cmd);
1927
68d81f40 1928 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1929 break;
1930 }
1931}
1932
c66ac9db 1933/*
35e0e757 1934 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1935 * and ordered cmds need to have their tasks added to the execution queue.
1936 */
1937static void transport_complete_task_attr(struct se_cmd *cmd)
1938{
5951146d 1939 struct se_device *dev = cmd->se_dev;
c66ac9db 1940
a3541703 1941 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1942 return;
1943
68d81f40 1944 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1945 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1946 dev->dev_cur_ordered_id++;
9c31820b
RD		 1947 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1948 dev->dev_cur_ordered_id);
68d81f40 1949 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1950 dev->dev_cur_ordered_id++;
9c31820b
RD		 1951 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1952 dev->dev_cur_ordered_id);
68d81f40 1953 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1954 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1955
1956 dev->dev_cur_ordered_id++;
9c31820b
RD		 1957 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1958 dev->dev_cur_ordered_id);
c66ac9db 1959 }
c66ac9db 1960
5f41a31d 1961 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1962}
1963
e057f533 1964static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1965{
1966 int ret = 0;
1967
019c4ca6 1968 transport_complete_task_attr(cmd);
e057f533
CH		 1969
1970 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1971 trace_target_cmd_complete(cmd);
e057f533 1972 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1973 goto out;
e057f533 1974 }
07bde79a
NB		 1975
1976 switch (cmd->data_direction) {
1977 case DMA_FROM_DEVICE:
4347ab5a
NB		 1978 if (cmd->scsi_status)
1979 goto queue_status;
1980
e5c0d6ad 1981 trace_target_cmd_complete(cmd);
07bde79a
NB		 1982 ret = cmd->se_tfo->queue_data_in(cmd);
1983 break;
1984 case DMA_TO_DEVICE:
64577407 1985 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1986 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1987 break;
07bde79a
NB		 1988 }
1989 /* Fall through for DMA_TO_DEVICE */
1990 case DMA_NONE:
4347ab5a 1991queue_status:
e5c0d6ad 1992 trace_target_cmd_complete(cmd);
07bde79a
NB		 1993 ret = cmd->se_tfo->queue_status(cmd);
1994 break;
1995 default:
1996 break;
1997 }
1998
e057f533
CH		 1999out:
2000 if (ret < 0) {
2001 transport_handle_queue_full(cmd, cmd->se_dev);
2002 return;
2003 }
2004 transport_lun_remove_cmd(cmd);
2005 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2006}
2007
2008static void transport_handle_queue_full(
2009 struct se_cmd *cmd,
e057f533 2010 struct se_device *dev)
07bde79a
NB		 2011{
2012 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2013 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2014 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2015 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2016
2017 schedule_work(&cmd->se_dev->qf_work_queue);
2018}
2019
fdeab852 2020static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2021{
fdeab852
NB		 2022 switch (cmd->prot_op) {
2023 case TARGET_PROT_DIN_STRIP:
2024 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2025 u32 sectors = cmd->data_length >>
2026 ilog2(cmd->se_dev->dev_attrib.block_size);
2027
2028 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2029 sectors, 0, cmd->t_prot_sg,
2030 0);
2031 if (cmd->pi_err)
fdeab852 2032 return true;
bc005869 2033 }
fdeab852 2034 break;
72c03850
NB		 2035 case TARGET_PROT_DIN_INSERT:
2036 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2037 break;
2038
2039 sbc_dif_generate(cmd);
2040 break;
fdeab852
NB		 2041 default:
2042 break;
bc005869
NB		 2043 }
2044
2045 return false;
2046}
2047
35e0e757 2048static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2049{
35e0e757 2050 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2051 int ret;
35e0e757 2052
c66ac9db
NB		 2053 /*
2054 * Check if we need to move delayed/dormant tasks from cmds on the
2055 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2056 * Attribute.
2057 */
019c4ca6
CH		 2058 transport_complete_task_attr(cmd);
2059
07bde79a
NB		 2060 /*
2061 * Check to schedule QUEUE_FULL work, or execute an existing
2062 * cmd->transport_qf_callback()
2063 */
2064 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2065 schedule_work(&cmd->se_dev->qf_work_queue);
2066
c66ac9db 2067 /*
d5829eac 2068 * Check if we need to send a sense buffer from
c66ac9db
NB		 2069 * the struct se_cmd in question.
2070 */
2071 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2072 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2073 ret = transport_send_check_condition_and_sense(
2074 cmd, 0, 1);
2075 if (ret == -EAGAIN || ret == -ENOMEM)
2076 goto queue_full;
2077
2078 transport_lun_remove_cmd(cmd);
2079 transport_cmd_check_stop_to_fabric(cmd);
2080 return;
c66ac9db
NB		 2081 }
2082 /*
25985edc 2083 * Check for a callback, used by amongst other things
a6b0133c 2084 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2085 */
a6b0133c
NB		 2086 if (cmd->transport_complete_callback) {
2087 sense_reason_t rc;
057085e5
NB		 2088 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2089 bool zero_dl = !(cmd->data_length);
2090 int post_ret = 0;
a6b0133c 2091
057085e5
NB		 2092 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2093 if (!rc && !post_ret) {
2094 if (caw && zero_dl)
c8e63985
NB		 2095 goto queue_rsp;
2096
a6b0133c 2097 return;
a2890087
NB		 2098 } else if (rc) {
2099 ret = transport_send_check_condition_and_sense(cmd,
2100 rc, 0);
2101 if (ret == -EAGAIN || ret == -ENOMEM)
2102 goto queue_full;
a6b0133c 2103
a2890087
NB		 2104 transport_lun_remove_cmd(cmd);
2105 transport_cmd_check_stop_to_fabric(cmd);
2106 return;
2107 }
a6b0133c 2108 }
c66ac9db 2109
c8e63985 2110queue_rsp:
c66ac9db
NB		 2111 switch (cmd->data_direction) {
2112 case DMA_FROM_DEVICE:
4347ab5a
NB		 2113 if (cmd->scsi_status)
2114 goto queue_status;
2115
4cc987ea
NB		 2116 atomic_long_add(cmd->data_length,
2117 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2118 /*
2119 * Perform READ_STRIP of PI using software emulation when
2120 * backend had PI enabled, if the transport will not be
2121 * performing hardware READ_STRIP offload.
2122 */
fdeab852 2123 if (target_read_prot_action(cmd)) {
bc005869
NB		 2124 ret = transport_send_check_condition_and_sense(cmd,
2125 cmd->pi_err, 0);
2126 if (ret == -EAGAIN || ret == -ENOMEM)
2127 goto queue_full;
2128
2129 transport_lun_remove_cmd(cmd);
2130 transport_cmd_check_stop_to_fabric(cmd);
2131 return;
2132 }
c66ac9db 2133
e5c0d6ad 2134 trace_target_cmd_complete(cmd);
07bde79a 2135 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2136 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2137 goto queue_full;
c66ac9db
NB		 2138 break;
2139 case DMA_TO_DEVICE:
4cc987ea
NB		 2140 atomic_long_add(cmd->data_length,
2141 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2142 /*
2143 * Check if we need to send READ payload for BIDI-COMMAND
2144 */
64577407 2145 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2146 atomic_long_add(cmd->data_length,
2147 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2148 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2149 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2150 goto queue_full;
c66ac9db
NB		 2151 break;
2152 }
2153 /* Fall through for DMA_TO_DEVICE */
2154 case DMA_NONE:
4347ab5a 2155queue_status:
e5c0d6ad 2156 trace_target_cmd_complete(cmd);
07bde79a 2157 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2158 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2159 goto queue_full;
c66ac9db
NB		 2160 break;
2161 default:
2162 break;
2163 }
2164
2165 transport_lun_remove_cmd(cmd);
2166 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2167 return;
2168
2169queue_full:
6708bb27 2170 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2171 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2172 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2173 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2174}
2175
e64aa657 2176void target_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2177{
ec98f782 2178 struct scatterlist *sg;
ec98f782 2179 int count;
c66ac9db 2180
6708bb27
AG		 2181 for_each_sg(sgl, sg, nents, count)
2182 __free_page(sg_page(sg));
c66ac9db 2183
6708bb27
AG		 2184 kfree(sgl);
2185}
e64aa657 2186EXPORT_SYMBOL(target_free_sgl);
c66ac9db 2187
47e459e6
NB		 2188static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2189{
2190 /*
2191 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2192 * emulation, and free + reset pointers if necessary..
2193 */
2194 if (!cmd->t_data_sg_orig)
2195 return;
2196
2197 kfree(cmd->t_data_sg);
2198 cmd->t_data_sg = cmd->t_data_sg_orig;
2199 cmd->t_data_sg_orig = NULL;
2200 cmd->t_data_nents = cmd->t_data_nents_orig;
2201 cmd->t_data_nents_orig = 0;
2202}
2203
6708bb27
AG		 2204static inline void transport_free_pages(struct se_cmd *cmd)
2205{
5835812f 2206 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
e64aa657 2207 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
5835812f
AM		 2208 cmd->t_prot_sg = NULL;
2209 cmd->t_prot_nents = 0;
2210 }
2211
47e459e6 2212 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2213 /*
2214 * Release special case READ buffer payload required for
2215 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2216 */
2217 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
e64aa657 2218 target_free_sgl(cmd->t_bidi_data_sg,
c8e63985
NB		 2219 cmd->t_bidi_data_nents);
2220 cmd->t_bidi_data_sg = NULL;
2221 cmd->t_bidi_data_nents = 0;
2222 }
47e459e6 2223 transport_reset_sgl_orig(cmd);
6708bb27 2224 return;
47e459e6
NB		 2225 }
2226 transport_reset_sgl_orig(cmd);
6708bb27 2227
e64aa657 2228 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2229 cmd->t_data_sg = NULL;
2230 cmd->t_data_nents = 0;
c66ac9db 2231
e64aa657 2232 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2233 cmd->t_bidi_data_sg = NULL;
2234 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2235}
2236
e26d99ae 2237/**
febe562c
NB		 2238 * transport_put_cmd - release a reference to a command
2239 * @cmd: command to release
e26d99ae 2240 *
febe562c 2241 * This routine releases our reference to the command and frees it if possible.
e26d99ae 2242 */
febe562c 2243static int transport_put_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2244{
2245 BUG_ON(!cmd->se_tfo);
e26d99ae 2246 /*
7481deb4
NB		 2247 * If this cmd has been setup with target_get_sess_cmd(), drop
2248 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2249 */
afc16604 2250 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2251}
2252
4949314c 2253void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2254{
ec98f782 2255 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2256 struct page **pages;
2257 int i;
05d1c7c0
AG		 2258
2259 /*
ec98f782
AG		 2260 * We need to take into account a possible offset here for fabrics like
2261 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2262 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2263 */
4949314c
AG		 2264 if (!cmd->t_data_nents)
2265 return NULL;
3717ef0c
PB		 2266
2267 BUG_ON(!sg);
2268 if (cmd->t_data_nents == 1)
4949314c
AG		 2269 return kmap(sg_page(sg)) + sg->offset;
2270
2271 /* >1 page. use vmap */
2272 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2273 if (!pages)
4949314c
AG		 2274 return NULL;
2275
2276 /* convert sg[] to pages[] */
2277 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2278 pages[i] = sg_page(sg);
2279 }
2280
2281 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2282 kfree(pages);
de103c93 2283 if (!cmd->t_data_vmap)
4949314c
AG		 2284 return NULL;
2285
2286 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2287}
4949314c 2288EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2289
4949314c 2290void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2291{
a1edf9cf 2292 if (!cmd->t_data_nents) {
4949314c 2293 return;
a1edf9cf 2294 } else if (cmd->t_data_nents == 1) {
4949314c 2295 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2296 return;
2297 }
4949314c
AG		 2298
2299 vunmap(cmd->t_data_vmap);
2300 cmd->t_data_vmap = NULL;
05d1c7c0 2301}
4949314c 2302EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2303
c5ff8d6b 2304int
20093994 2305target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
e64aa657 2306 bool zero_page, bool chainable)
c66ac9db 2307{
20093994 2308 struct scatterlist *sg;
ec98f782 2309 struct page *page;
20093994 2310 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
e64aa657 2311 unsigned int nalloc, nent;
ec98f782 2312 int i = 0;
c66ac9db 2313
e64aa657
CH		 2314 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2315 if (chainable)
2316 nalloc++;
2317 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
20093994 2318 if (!sg)
ec98f782 2319 return -ENOMEM;
c66ac9db 2320
e64aa657 2321 sg_init_table(sg, nalloc);
9db9da33 2322
ec98f782
AG		 2323 while (length) {
2324 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2325 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2326 if (!page)
2327 goto out;
c66ac9db 2328
20093994 2329 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2330 length -= page_len;
2331 i++;
c66ac9db 2332 }
20093994
NB		 2333 *sgl = sg;
2334 *nents = nent;
c66ac9db 2335 return 0;
c66ac9db 2336
ec98f782 2337out:
d0e27c88 2338 while (i > 0) {
ec98f782 2339 i--;
20093994 2340 __free_page(sg_page(&sg[i]));
c66ac9db 2341 }
20093994 2342 kfree(sg);
ec98f782 2343 return -ENOMEM;
c66ac9db 2344}
e64aa657 2345EXPORT_SYMBOL(target_alloc_sgl);
c66ac9db 2346
da0f7619 2347/*
b16a35b0
AG		 2348 * Allocate any required resources to execute the command. For writes we
2349 * might not have the payload yet, so notify the fabric via a call to
2350 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2351 */
de103c93
CH		 2352sense_reason_t
2353transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2354{
c66ac9db 2355 int ret = 0;
c8e63985 2356 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2357
5835812f
AM		 2358 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2359 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2360 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
e64aa657 2361 cmd->prot_length, true, false);
5835812f
AM		 2362 if (ret < 0)
2363 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2364 }
2365
c66ac9db
NB		 2366 /*
2367 * Determine is the TCM fabric module has already allocated physical
2368 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2369 * beforehand.
c66ac9db 2370 */
ec98f782
AG		 2371 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2372 cmd->data_length) {
20093994 2373
8cefe07b
NB		 2374 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2375 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2376 u32 bidi_length;
2377
2378 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2379 bidi_length = cmd->t_task_nolb *
2380 cmd->se_dev->dev_attrib.block_size;
2381 else
2382 bidi_length = cmd->data_length;
2383
2384 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2385 &cmd->t_bidi_data_nents,
e64aa657 2386 bidi_length, zero_flag, false);
8cefe07b
NB		 2387 if (ret < 0)
2388 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2389 }
2390
20093994 2391 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
e64aa657 2392 cmd->data_length, zero_flag, false);
c66ac9db 2393 if (ret < 0)
de103c93 2394 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2395 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2396 cmd->data_length) {
2397 /*
2398 * Special case for COMPARE_AND_WRITE with fabrics
2399 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2400 */
2401 u32 caw_length = cmd->t_task_nolb *
2402 cmd->se_dev->dev_attrib.block_size;
2403
2404 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2405 &cmd->t_bidi_data_nents,
e64aa657 2406 caw_length, zero_flag, false);
c8e63985
NB		 2407 if (ret < 0)
2408 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2409 }
c66ac9db 2410 /*
c3196f0c
CH		 2411 * If this command is not a write we can execute it right here,
2412 * for write buffers we need to notify the fabric driver first
2413 * and let it call back once the write buffers are ready.
c66ac9db 2414 */
5f41a31d 2415 target_add_to_state_list(cmd);
885e7b0e 2416 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2417 target_execute_cmd(cmd);
2418 return 0;
2419 }
862e6389 2420 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2421
2422 ret = cmd->se_tfo->write_pending(cmd);
2423 if (ret == -EAGAIN || ret == -ENOMEM)
2424 goto queue_full;
2425
de103c93
CH		 2426 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2427 WARN_ON(ret);
2428
b69c1fcf 2429 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2430
c3196f0c
CH		 2431queue_full:
2432 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2433 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2434 transport_handle_queue_full(cmd, cmd->se_dev);
2435 return 0;
c66ac9db 2436}
a1d8b49a 2437EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2438
e057f533 2439static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2440{
f147abb4
NB		 2441 int ret;
2442
2443 ret = cmd->se_tfo->write_pending(cmd);
2444 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2445 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2446 cmd);
2447 transport_handle_queue_full(cmd, cmd->se_dev);
2448 }
07bde79a
NB		 2449}
2450
0f4a9431
NB		 2451static bool
2452__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2453 unsigned long *flags);
2454
2455static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2456{
2457 unsigned long flags;
2458
2459 spin_lock_irqsave(&cmd->t_state_lock, flags);
2460 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2461 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2462}
2463
d5ddad41 2464int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2465{
d5ddad41 2466 int ret = 0;
0f4a9431 2467 bool aborted = false, tas = false;
d5ddad41 2468
d14921d6 2469 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2470 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2471 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2472
0f4a9431
NB		 2473 if (!aborted || tas)
2474 ret = transport_put_cmd(cmd);
d14921d6
NB		 2475 } else {
2476 if (wait_for_tasks)
0f4a9431 2477 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2478 /*
2479 * Handle WRITE failure case where transport_generic_new_cmd()
2480 * has already added se_cmd to state_list, but fabric has
2481 * failed command before I/O submission.
2482 */
febe562c 2483 if (cmd->state_active)
c130480b 2484 target_remove_from_state_list(cmd);
d14921d6 2485
82f1c8a4 2486 if (cmd->se_lun)
c66ac9db 2487 transport_lun_remove_cmd(cmd);
c66ac9db 2488
0f4a9431
NB		 2489 if (!aborted || tas)
2490 ret = transport_put_cmd(cmd);
2491 }
2492 /*
2493 * If the task has been internally aborted due to TMR ABORT_TASK
2494 * or LUN_RESET, target_core_tmr.c is responsible for performing
2495 * the remaining calls to target_put_sess_cmd(), and not the
2496 * callers of this function.
2497 */
2498 if (aborted) {
2499 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2500 wait_for_completion(&cmd->cmd_wait_comp);
2501 cmd->se_tfo->release_cmd(cmd);
2502 ret = 1;
c66ac9db 2503 }
d5ddad41 2504 return ret;
c66ac9db
NB		 2505}
2506EXPORT_SYMBOL(transport_generic_free_cmd);
2507
a17f091d 2508/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2509 * @se_cmd: command descriptor to add
a6360785 2510 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2511 */
afc16604 2512int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2513{
afc16604 2514 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2515 unsigned long flags;
bc187ea6 2516 int ret = 0;
a17f091d 2517
a6360785
NB		 2518 /*
2519 * Add a second kref if the fabric caller is expecting to handle
2520 * fabric acknowledgement that requires two target_put_sess_cmd()
2521 * invocations before se_cmd descriptor release.
2522 */
054922bb 2523 if (ack_kref)
a6360785 2524 kref_get(&se_cmd->cmd_kref);
7481deb4 2525
a17f091d 2526 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2527 if (se_sess->sess_tearing_down) {
2528 ret = -ESHUTDOWN;
2529 goto out;
2530 }
a17f091d 2531 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2532out:
a17f091d 2533 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2534
2535 if (ret && ack_kref)
afc16604 2536 target_put_sess_cmd(se_cmd);
7544e597 2537
bc187ea6 2538 return ret;
a17f091d 2539}
20361e69 2540EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2541
febe562c
NB		 2542static void target_free_cmd_mem(struct se_cmd *cmd)
2543{
2544 transport_free_pages(cmd);
2545
2546 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2547 core_tmr_release_req(cmd->se_tmr_req);
2548 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2549 kfree(cmd->t_task_cdb);
2550}
2551
7481deb4 2552static void target_release_cmd_kref(struct kref *kref)
a17f091d 2553{
7481deb4
NB		 2554 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2555 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2556 unsigned long flags;
0f4a9431 2557 bool fabric_stop;
a17f091d 2558
9ff9d15e 2559 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
0f4a9431
NB		 2560
2561 spin_lock(&se_cmd->t_state_lock);
064cdd2d
NB		 2562 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2563 (se_cmd->transport_state & CMD_T_ABORTED);
0f4a9431
NB		 2564 spin_unlock(&se_cmd->t_state_lock);
2565
2566 if (se_cmd->cmd_wait_set || fabric_stop) {
2567 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2568 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
febe562c 2569 target_free_cmd_mem(se_cmd);
a17f091d 2570 complete(&se_cmd->cmd_wait_comp);
7481deb4 2571 return;
a17f091d 2572 }
0f4a9431 2573 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2574 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2575
febe562c 2576 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2577 se_cmd->se_tfo->release_cmd(se_cmd);
2578}
2579
2580/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2581 * @se_cmd: command descriptor to drop
2582 */
afc16604 2583int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2584{
afc16604
BVA		 2585 struct se_session *se_sess = se_cmd->se_sess;
2586
0ed6e189 2587 if (!se_sess) {
febe562c 2588 target_free_cmd_mem(se_cmd);
0ed6e189
NB		 2589 se_cmd->se_tfo->release_cmd(se_cmd);
2590 return 1;
2591 }
9ff9d15e 2592 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2593}
2594EXPORT_SYMBOL(target_put_sess_cmd);
2595
1c7b13fe
RD		 2596/* target_sess_cmd_list_set_waiting - Flag all commands in
2597 * sess_cmd_list to complete cmd_wait_comp. Set
2598 * sess_tearing_down so no more commands are queued.
2599 * @se_sess: session to flag
a17f091d 2600 */
1c7b13fe 2601void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2602{
2603 struct se_cmd *se_cmd;
2604 unsigned long flags;
0f4a9431 2605 int rc;
a17f091d 2606
a17f091d 2607 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2608 if (se_sess->sess_tearing_down) {
2609 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2610 return;
2611 }
1c7b13fe 2612 se_sess->sess_tearing_down = 1;
9b31a328 2613 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2614
0f4a9431
NB		 2615 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) {
2616 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2617 if (rc) {
2618 se_cmd->cmd_wait_set = 1;
2619 spin_lock(&se_cmd->t_state_lock);
2620 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2621 spin_unlock(&se_cmd->t_state_lock);
2622 }
2623 }
a17f091d
NB		 2624
2625 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2626}
1c7b13fe 2627EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2628
2629/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2630 * @se_sess: session to wait for active I/O
a17f091d 2631 */
be646c2d 2632void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2633{
2634 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2635 unsigned long flags;
0f4a9431 2636 bool tas;
a17f091d
NB		 2637
2638 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2639 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2640 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2641 " %d\n", se_cmd, se_cmd->t_state,
2642 se_cmd->se_tfo->get_cmd_state(se_cmd));
2643
0f4a9431
NB		 2644 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2645 tas = (se_cmd->transport_state & CMD_T_TAS);
2646 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2647
2648 if (!target_put_sess_cmd(se_cmd)) {
2649 if (tas)
2650 target_put_sess_cmd(se_cmd);
2651 }
2652
be646c2d
JE		 2653 wait_for_completion(&se_cmd->cmd_wait_comp);
2654 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2655 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2656 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2657
2658 se_cmd->se_tfo->release_cmd(se_cmd);
2659 }
9b31a328
NB		 2660
2661 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2662 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2663 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2664
a17f091d
NB		 2665}
2666EXPORT_SYMBOL(target_wait_for_sess_cmds);
2667
b3eeea66 2668void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2669{
5277797d 2670 percpu_ref_kill(&lun->lun_ref);
5277797d 2671 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2672}
2673
0f4a9431
NB		 2674static bool
2675__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2676 bool *aborted, bool *tas, unsigned long *flags)
2677 __releases(&cmd->t_state_lock)
2678 __acquires(&cmd->t_state_lock)
c66ac9db 2679{
c66ac9db 2680
0f4a9431
NB		 2681 assert_spin_locked(&cmd->t_state_lock);
2682 WARN_ON_ONCE(!irqs_disabled());
2683
2684 if (fabric_stop)
2685 cmd->transport_state |= CMD_T_FABRIC_STOP;
2686
2687 if (cmd->transport_state & CMD_T_ABORTED)
2688 *aborted = true;
2689
2690 if (cmd->transport_state & CMD_T_TAS)
2691 *tas = true;
2692
c8e31f26 2693 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2694 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2695 return false;
cb4f4d3c 2696
c8e31f26 2697 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2698 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2699 return false;
7d680f3b 2700
0f4a9431
NB		 2701 if (!(cmd->transport_state & CMD_T_ACTIVE))
2702 return false;
2703
2704 if (fabric_stop && *aborted)
a17f091d 2705 return false;
c66ac9db 2706
7d680f3b 2707 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2708
0f4a9431
NB		 2709 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2710 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2711 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2712
0f4a9431 2713 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2714
a1d8b49a 2715 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2716
0f4a9431 2717 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2718 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2719
0f4a9431
NB		 2720 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2721 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2722
0f4a9431
NB		 2723 return true;
2724}
2725
2726/**
2727 * transport_wait_for_tasks - wait for completion to occur
2728 * @cmd: command to wait
2729 *
2730 * Called from frontend fabric context to wait for storage engine
2731 * to pause and/or release frontend generated struct se_cmd.
2732 */
2733bool transport_wait_for_tasks(struct se_cmd *cmd)
2734{
2735 unsigned long flags;
2736 bool ret, aborted = false, tas = false;
2737
2738 spin_lock_irqsave(&cmd->t_state_lock, flags);
2739 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 2740 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2741
0f4a9431 2742 return ret;
c66ac9db 2743}
d14921d6 2744EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2745
ab78fef4
BVA		 2746struct sense_info {
2747 u8 key;
2748 u8 asc;
2749 u8 ascq;
2750 bool add_sector_info;
2751};
2752
2753static const struct sense_info sense_info_table[] = {
2754 [TCM_NO_SENSE] = {
2755 .key = NOT_READY
2756 },
2757 [TCM_NON_EXISTENT_LUN] = {
2758 .key = ILLEGAL_REQUEST,
2759 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2760 },
2761 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2762 .key = ILLEGAL_REQUEST,
2763 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2764 },
2765 [TCM_SECTOR_COUNT_TOO_MANY] = {
2766 .key = ILLEGAL_REQUEST,
2767 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2768 },
2769 [TCM_UNKNOWN_MODE_PAGE] = {
2770 .key = ILLEGAL_REQUEST,
2771 .asc = 0x24, /* INVALID FIELD IN CDB */
2772 },
2773 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2774 .key = ABORTED_COMMAND,
2775 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2776 .ascq = 0x03,
2777 },
2778 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2779 .key = ABORTED_COMMAND,
2780 .asc = 0x0c, /* WRITE ERROR */
2781 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2782 },
2783 [TCM_INVALID_CDB_FIELD] = {
2784 .key = ILLEGAL_REQUEST,
2785 .asc = 0x24, /* INVALID FIELD IN CDB */
2786 },
2787 [TCM_INVALID_PARAMETER_LIST] = {
2788 .key = ILLEGAL_REQUEST,
2789 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2790 },
2791 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2792 .key = ILLEGAL_REQUEST,
2793 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2794 },
2795 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2796 .key = ILLEGAL_REQUEST,
2797 .asc = 0x0c, /* WRITE ERROR */
2798 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2799 },
2800 [TCM_SERVICE_CRC_ERROR] = {
2801 .key = ABORTED_COMMAND,
2802 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2803 .ascq = 0x05, /* N/A */
2804 },
2805 [TCM_SNACK_REJECTED] = {
2806 .key = ABORTED_COMMAND,
2807 .asc = 0x11, /* READ ERROR */
2808 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2809 },
2810 [TCM_WRITE_PROTECTED] = {
2811 .key = DATA_PROTECT,
2812 .asc = 0x27, /* WRITE PROTECTED */
2813 },
2814 [TCM_ADDRESS_OUT_OF_RANGE] = {
2815 .key = ILLEGAL_REQUEST,
2816 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2817 },
2818 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2819 .key = UNIT_ATTENTION,
2820 },
2821 [TCM_CHECK_CONDITION_NOT_READY] = {
2822 .key = NOT_READY,
2823 },
2824 [TCM_MISCOMPARE_VERIFY] = {
2825 .key = MISCOMPARE,
2826 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2827 .ascq = 0x00,
2828 },
2829 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2830 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2831 .asc = 0x10,
2832 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2833 .add_sector_info = true,
2834 },
2835 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2836 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2837 .asc = 0x10,
2838 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2839 .add_sector_info = true,
2840 },
2841 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2842 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2843 .asc = 0x10,
2844 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2845 .add_sector_info = true,
2846 },
2847 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2848 /*
2849 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2850 * Solaris initiators. Returning NOT READY instead means the
2851 * operations will be retried a finite number of times and we
2852 * can survive intermittent errors.
2853 */
2854 .key = NOT_READY,
2855 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2856 },
2857};
2858
f5a8b3a7 2859static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2860{
2861 const struct sense_info *si;
2862 u8 *buffer = cmd->sense_buffer;
2863 int r = (__force int)reason;
2864 u8 asc, ascq;
4e4937e8 2865 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2866
2867 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2868 si = &sense_info_table[r];
2869 else
2870 si = &sense_info_table[(__force int)
2871 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2872
ab78fef4
BVA		 2873 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2874 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2875 WARN_ON_ONCE(asc == 0);
2876 } else if (si->asc == 0) {
2877 WARN_ON_ONCE(cmd->scsi_asc == 0);
2878 asc = cmd->scsi_asc;
2879 ascq = cmd->scsi_ascq;
2880 } else {
2881 asc = si->asc;
2882 ascq = si->ascq;
2883 }
9ec1e1ce 2884
4e4937e8 2885 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 2886 if (si->add_sector_info)
f5a8b3a7
SG		 2887 return scsi_set_sense_information(buffer,
2888 cmd->scsi_sense_length,
2889 cmd->bad_sector);
2890
2891 return 0;
ab78fef4
BVA		 2892}
2893
de103c93
CH		 2894int
2895transport_send_check_condition_and_sense(struct se_cmd *cmd,
2896 sense_reason_t reason, int from_transport)
c66ac9db 2897{
c66ac9db 2898 unsigned long flags;
c66ac9db 2899
a1d8b49a 2900 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2901 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2902 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2903 return 0;
2904 }
2905 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2906 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2907
ab78fef4 2908 if (!from_transport) {
f5a8b3a7
SG		 2909 int rc;
2910
c66ac9db 2911 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 2912 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2913 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 2914 rc = translate_sense_reason(cmd, reason);
2915 if (rc)
2916 return rc;
c66ac9db 2917 }
c66ac9db 2918
e5c0d6ad 2919 trace_target_cmd_complete(cmd);
07bde79a 2920 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2921}
2922EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2923
310d3d31
NB		 2924static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2925 __releases(&cmd->t_state_lock)
2926 __acquires(&cmd->t_state_lock)
c66ac9db 2927{
310d3d31
NB		 2928 assert_spin_locked(&cmd->t_state_lock);
2929 WARN_ON_ONCE(!irqs_disabled());
2930
c18bc7d8
RD		 2931 if (!(cmd->transport_state & CMD_T_ABORTED))
2932 return 0;
68259b5a
AL		 2933 /*
2934 * If cmd has been aborted but either no status is to be sent or it has
2935 * already been sent, just return
2936 */
310d3d31
NB		 2937 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
2938 if (send_status)
2939 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 2940 return 1;
310d3d31 2941 }
8b1e1244 2942
310d3d31
NB		 2943 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
2944 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2945
68259b5a 2946 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2947 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2948 trace_target_cmd_complete(cmd);
310d3d31
NB		 2949
2950 spin_unlock_irq(&cmd->t_state_lock);
c18bc7d8 2951 cmd->se_tfo->queue_status(cmd);
310d3d31 2952 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 2953
2954 return 1;
c66ac9db 2955}
310d3d31
NB		 2956
2957int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2958{
2959 int ret;
2960
2961 spin_lock_irq(&cmd->t_state_lock);
2962 ret = __transport_check_aborted_status(cmd, send_status);
2963 spin_unlock_irq(&cmd->t_state_lock);
2964
2965 return ret;
2966}
c66ac9db
NB		 2967EXPORT_SYMBOL(transport_check_aborted_status);
2968
2969void transport_send_task_abort(struct se_cmd *cmd)
2970{
c252f003
NB		 2971 unsigned long flags;
2972
2973 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2974 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2975 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2976 return;
2977 }
2978 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2979
c66ac9db
NB		 2980 /*
2981 * If there are still expected incoming fabric WRITEs, we wait
2982 * until until they have completed before sending a TASK_ABORTED
2983 * response. This response with TASK_ABORTED status will be
2984 * queued back to fabric module by transport_check_aborted_status().
2985 */
2986 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2987 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 2988 spin_lock_irqsave(&cmd->t_state_lock, flags);
2989 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
2990 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2991 goto send_abort;
2992 }
68259b5a 2993 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 2994 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 2995 return;
c66ac9db
NB		 2996 }
2997 }
310d3d31 2998send_abort:
c66ac9db 2999 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3000
72b59d6e
RD		 3001 transport_lun_remove_cmd(cmd);
3002
649ee054
BVA		 3003 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3004 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3005
e5c0d6ad 3006 trace_target_cmd_complete(cmd);
e3d6f909 3007 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3008}
3009
af877292 3010static void target_tmr_work(struct work_struct *work)
c66ac9db 3011{
af877292 3012 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3013 struct se_device *dev = cmd->se_dev;
c66ac9db 3014 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 3015 unsigned long flags;
c66ac9db
NB		 3016 int ret;
3017
a6d9bb1c
NB		 3018 spin_lock_irqsave(&cmd->t_state_lock, flags);
3019 if (cmd->transport_state & CMD_T_ABORTED) {
3020 tmr->response = TMR_FUNCTION_REJECTED;
3021 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3022 goto check_stop;
3023 }
3024 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3025
c66ac9db 3026 switch (tmr->function) {
5c6cd613 3027 case TMR_ABORT_TASK:
3d28934a 3028 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3029 break;
5c6cd613
NB		 3030 case TMR_ABORT_TASK_SET:
3031 case TMR_CLEAR_ACA:
3032 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3033 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3034 break;
5c6cd613 3035 case TMR_LUN_RESET:
c66ac9db
NB		 3036 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3037 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3038 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3039 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3040 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3041 cmd->orig_fe_lun, 0x29,
3042 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3043 }
c66ac9db 3044 break;
5c6cd613 3045 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3046 tmr->response = TMR_FUNCTION_REJECTED;
3047 break;
5c6cd613 3048 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3049 tmr->response = TMR_FUNCTION_REJECTED;
3050 break;
c66ac9db 3051 default:
6708bb27 3052 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3053 tmr->function);
3054 tmr->response = TMR_FUNCTION_REJECTED;
3055 break;
3056 }
3057
a6d9bb1c
NB		 3058 spin_lock_irqsave(&cmd->t_state_lock, flags);
3059 if (cmd->transport_state & CMD_T_ABORTED) {
3060 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3061 goto check_stop;
3062 }
c66ac9db 3063 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
a6d9bb1c
NB		 3064 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3065
e3d6f909 3066 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3067
a6d9bb1c 3068check_stop:
b7b8bef7 3069 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3070}
3071
af877292
CH		 3072int transport_generic_handle_tmr(
3073 struct se_cmd *cmd)
c66ac9db 3074{
f15e9cd9
NB		 3075 unsigned long flags;
3076
3077 spin_lock_irqsave(&cmd->t_state_lock, flags);
3078 cmd->transport_state |= CMD_T_ACTIVE;
3079 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3080
af877292
CH		 3081 INIT_WORK(&cmd->work, target_tmr_work);
3082 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3083 return 0;
3084}
af877292 3085EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3086
3087bool
3088target_check_wce(struct se_device *dev)
3089{
3090 bool wce = false;
3091
3092 if (dev->transport->get_write_cache)
3093 wce = dev->transport->get_write_cache(dev);
3094 else if (dev->dev_attrib.emulate_write_cache > 0)
3095 wce = true;
3096
3097 return wce;
3098}
3099
3100bool
3101target_check_fua(struct se_device *dev)
3102{
3103 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3104}
ubuntu-bionic-kernel mirror