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target: Obtain se_node_acl->acl_kref during get_initiator_node_acl
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
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);
41ac82b6 242 kref_init(&se_sess->sess_kref);
e70beee7 243 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 244
245 return se_sess;
246}
247EXPORT_SYMBOL(transport_init_session);
248
c0add7fd
NB		 249int transport_alloc_session_tags(struct se_session *se_sess,
250 unsigned int tag_num, unsigned int tag_size)
251{
252 int rc;
253
8c7f6e9b
NB		 254 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
255 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 256 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 257 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
258 if (!se_sess->sess_cmd_map) {
259 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
260 return -ENOMEM;
261 }
c0add7fd
NB		 262 }
263
264 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
265 if (rc < 0) {
266 pr_err("Unable to init se_sess->sess_tag_pool,"
267 " tag_num: %u\n", tag_num);
de64d3a6 268 kvfree(se_sess->sess_cmd_map);
c0add7fd
NB		 269 se_sess->sess_cmd_map = NULL;
270 return -ENOMEM;
271 }
272
273 return 0;
274}
275EXPORT_SYMBOL(transport_alloc_session_tags);
276
277struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 278 unsigned int tag_size,
279 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 280{
281 struct se_session *se_sess;
282 int rc;
283
e70beee7 284 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 285 if (IS_ERR(se_sess))
286 return se_sess;
287
288 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
289 if (rc < 0) {
290 transport_free_session(se_sess);
291 return ERR_PTR(-ENOMEM);
292 }
293
294 return se_sess;
295}
296EXPORT_SYMBOL(transport_init_session_tags);
297
c66ac9db 298/*
140854cb 299 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 300 */
301void __transport_register_session(
302 struct se_portal_group *se_tpg,
303 struct se_node_acl *se_nacl,
304 struct se_session *se_sess,
305 void *fabric_sess_ptr)
306{
9ac8928e 307 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 308 unsigned char buf[PR_REG_ISID_LEN];
309
310 se_sess->se_tpg = se_tpg;
311 se_sess->fabric_sess_ptr = fabric_sess_ptr;
312 /*
313 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
314 *
315 * Only set for struct se_session's that will actually be moving I/O.
316 * eg: *NOT* discovery sessions.
317 */
318 if (se_nacl) {
bffb5128
NB		 319 /*
320 *
321 * Determine if fabric allows for T10-PI feature bits exposed to
322 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
323 *
324 * If so, then always save prot_type on a per se_node_acl node
325 * basis and re-instate the previous sess_prot_type to avoid
326 * disabling PI from below any previously initiator side
327 * registered LUNs.
328 */
329 if (se_nacl->saved_prot_type)
330 se_sess->sess_prot_type = se_nacl->saved_prot_type;
331 else if (tfo->tpg_check_prot_fabric_only)
332 se_sess->sess_prot_type = se_nacl->saved_prot_type =
333 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 334 /*
335 * If the fabric module supports an ISID based TransportID,
336 * save this value in binary from the fabric I_T Nexus now.
337 */
e3d6f909 338 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 339 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 340 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 341 &buf[0], PR_REG_ISID_LEN);
342 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
343 }
afb999ff 344
c66ac9db
NB		 345 spin_lock_irq(&se_nacl->nacl_sess_lock);
346 /*
347 * The se_nacl->nacl_sess pointer will be set to the
348 * last active I_T Nexus for each struct se_node_acl.
349 */
350 se_nacl->nacl_sess = se_sess;
351
352 list_add_tail(&se_sess->sess_acl_list,
353 &se_nacl->acl_sess_list);
354 spin_unlock_irq(&se_nacl->nacl_sess_lock);
355 }
356 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
357
6708bb27 358 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 359 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 360}
361EXPORT_SYMBOL(__transport_register_session);
362
363void transport_register_session(
364 struct se_portal_group *se_tpg,
365 struct se_node_acl *se_nacl,
366 struct se_session *se_sess,
367 void *fabric_sess_ptr)
368{
140854cb
NB		 369 unsigned long flags;
370
371 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 372 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 373 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 374}
375EXPORT_SYMBOL(transport_register_session);
376
ecf0dd66 377static void target_release_session(struct kref *kref)
41ac82b6
NB		 378{
379 struct se_session *se_sess = container_of(kref,
380 struct se_session, sess_kref);
381 struct se_portal_group *se_tpg = se_sess->se_tpg;
382
383 se_tpg->se_tpg_tfo->close_session(se_sess);
384}
385
386void target_get_session(struct se_session *se_sess)
387{
388 kref_get(&se_sess->sess_kref);
389}
390EXPORT_SYMBOL(target_get_session);
391
33933a0e 392void target_put_session(struct se_session *se_sess)
41ac82b6 393{
33933a0e 394 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 395}
396EXPORT_SYMBOL(target_put_session);
397
f8e471f9
NB		 398ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
399{
400 struct se_session *se_sess;
401 ssize_t len = 0;
402
403 spin_lock_bh(&se_tpg->session_lock);
404 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
405 if (!se_sess->se_node_acl)
406 continue;
407 if (!se_sess->se_node_acl->dynamic_node_acl)
408 continue;
409 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
410 break;
411
412 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
413 se_sess->se_node_acl->initiatorname);
414 len += 1; /* Include NULL terminator */
415 }
416 spin_unlock_bh(&se_tpg->session_lock);
417
418 return len;
419}
420EXPORT_SYMBOL(target_show_dynamic_sessions);
421
afb999ff
NB		 422static void target_complete_nacl(struct kref *kref)
423{
424 struct se_node_acl *nacl = container_of(kref,
425 struct se_node_acl, acl_kref);
426
427 complete(&nacl->acl_free_comp);
428}
429
430void target_put_nacl(struct se_node_acl *nacl)
431{
432 kref_put(&nacl->acl_kref, target_complete_nacl);
433}
4a3c526c 434EXPORT_SYMBOL(target_put_nacl);
afb999ff 435
c66ac9db
NB		 436void transport_deregister_session_configfs(struct se_session *se_sess)
437{
438 struct se_node_acl *se_nacl;
23388864 439 unsigned long flags;
c66ac9db
NB		 440 /*
441 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
442 */
443 se_nacl = se_sess->se_node_acl;
6708bb27 444 if (se_nacl) {
23388864 445 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 446 if (se_nacl->acl_stop == 0)
447 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 448 /*
449 * If the session list is empty, then clear the pointer.
450 * Otherwise, set the struct se_session pointer from the tail
451 * element of the per struct se_node_acl active session list.
452 */
453 if (list_empty(&se_nacl->acl_sess_list))
454 se_nacl->nacl_sess = NULL;
455 else {
456 se_nacl->nacl_sess = container_of(
457 se_nacl->acl_sess_list.prev,
458 struct se_session, sess_acl_list);
459 }
23388864 460 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 461 }
462}
463EXPORT_SYMBOL(transport_deregister_session_configfs);
464
465void transport_free_session(struct se_session *se_sess)
466{
4a3c526c
NB		 467 struct se_node_acl *se_nacl = se_sess->se_node_acl;
468 /*
469 * Drop the se_node_acl->nacl_kref obtained from within
470 * core_tpg_get_initiator_node_acl().
471 */
472 if (se_nacl) {
473 se_sess->se_node_acl = NULL;
474 target_put_nacl(se_nacl);
475 }
c0add7fd
NB		 476 if (se_sess->sess_cmd_map) {
477 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 478 kvfree(se_sess->sess_cmd_map);
c0add7fd 479 }
c66ac9db
NB		 480 kmem_cache_free(se_sess_cache, se_sess);
481}
482EXPORT_SYMBOL(transport_free_session);
483
484void transport_deregister_session(struct se_session *se_sess)
485{
486 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 487 const struct target_core_fabric_ops *se_tfo;
c66ac9db 488 struct se_node_acl *se_nacl;
e63a8e19 489 unsigned long flags;
4a3c526c 490 bool drop_nacl = false;
c66ac9db 491
6708bb27 492 if (!se_tpg) {
c66ac9db
NB		 493 transport_free_session(se_sess);
494 return;
495 }
01468346 496 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 497
e63a8e19 498 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 499 list_del(&se_sess->sess_list);
500 se_sess->se_tpg = NULL;
501 se_sess->fabric_sess_ptr = NULL;
e63a8e19 502 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 503
504 /*
505 * Determine if we need to do extra work for this initiator node's
506 * struct se_node_acl if it had been previously dynamically generated.
507 */
508 se_nacl = se_sess->se_node_acl;
01468346 509
403edd78 510 mutex_lock(&se_tpg->acl_node_mutex);
01468346
NB		 511 if (se_nacl && se_nacl->dynamic_node_acl) {
512 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
513 list_del(&se_nacl->acl_list);
514 se_tpg->num_node_acls--;
403edd78 515 drop_nacl = true;
c66ac9db 516 }
c66ac9db 517 }
403edd78 518 mutex_unlock(&se_tpg->acl_node_mutex);
c66ac9db 519
403edd78
NB		 520 if (drop_nacl) {
521 core_tpg_wait_for_nacl_pr_ref(se_nacl);
522 core_free_device_list_for_node(se_nacl, se_tpg);
4a3c526c 523 se_sess->se_node_acl = NULL;
403edd78 524 kfree(se_nacl);
403edd78 525 }
6708bb27 526 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 527 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 528 /*
125d0119 529 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff 530 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
4a3c526c 531 * removal context from within transport_free_session() code.
01468346 532 */
01468346 533
afb999ff 534 transport_free_session(se_sess);
c66ac9db
NB		 535}
536EXPORT_SYMBOL(transport_deregister_session);
537
cf572a96 538static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 539{
42bf829e 540 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 541 unsigned long flags;
542
42bf829e
CH		 543 if (!dev)
544 return;
c66ac9db 545
cf572a96
CH		 546 if (cmd->transport_state & CMD_T_BUSY)
547 return;
c66ac9db 548
cf572a96
CH		 549 spin_lock_irqsave(&dev->execute_task_lock, flags);
550 if (cmd->state_active) {
551 list_del(&cmd->state_list);
cf572a96 552 cmd->state_active = false;
c66ac9db 553 }
cf572a96 554 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 555}
556
862e6389
NB		 557static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
558 bool write_pending)
c66ac9db
NB		 559{
560 unsigned long flags;
561
f7113a47
CH		 562 if (remove_from_lists) {
563 target_remove_from_state_list(cmd);
564
565 /*
566 * Clear struct se_cmd->se_lun before the handoff to FE.
567 */
568 cmd->se_lun = NULL;
569 }
570
3b493f9f
NB		 571 spin_lock_irqsave(&cmd->t_state_lock, flags);
572 if (write_pending)
573 cmd->t_state = TRANSPORT_WRITE_PENDING;
574
c66ac9db
NB		 575 /*
576 * Determine if frontend context caller is requesting the stopping of
e3d6f909 577 * this command for frontend exceptions.
c66ac9db 578 */
7d680f3b 579 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 580 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
581 __func__, __LINE__, cmd->tag);
c66ac9db 582
a1d8b49a 583 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 584
a95d6511 585 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 586 return 1;
587 }
f7113a47
CH		 588
589 cmd->transport_state &= ~CMD_T_ACTIVE;
590 if (remove_from_lists) {
591 /*
592 * Some fabric modules like tcm_loop can release
593 * their internally allocated I/O reference now and
594 * struct se_cmd now.
595 *
596 * Fabric modules are expected to return '1' here if the
597 * se_cmd being passed is released at this point,
598 * or zero if not being released.
599 */
600 if (cmd->se_tfo->check_stop_free != NULL) {
601 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
602 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 603 }
f7113a47 604 }
c66ac9db 605
a1d8b49a 606 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 607 return 0;
608}
609
610static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
611{
862e6389 612 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 613}
614
615static void transport_lun_remove_cmd(struct se_cmd *cmd)
616{
e3d6f909 617 struct se_lun *lun = cmd->se_lun;
c66ac9db 618
5259a06e 619 if (!lun)
c66ac9db
NB		 620 return;
621
5259a06e
NB		 622 if (cmpxchg(&cmd->lun_ref_active, true, false))
623 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 624}
625
626void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
627{
3b493f9f
NB		 628 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
629
68259b5a
AL		 630 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
631 transport_lun_remove_cmd(cmd);
131e6abc
NB		 632 /*
633 * Allow the fabric driver to unmap any resources before
634 * releasing the descriptor via TFO->release_cmd()
635 */
636 if (remove)
637 cmd->se_tfo->aborted_task(cmd);
68259b5a 638
c66ac9db
NB		 639 if (transport_cmd_check_stop_to_fabric(cmd))
640 return;
3b493f9f 641 if (remove && ack_kref)
e6a2573f 642 transport_put_cmd(cmd);
c66ac9db
NB		 643}
644
35e0e757
CH		 645static void target_complete_failure_work(struct work_struct *work)
646{
647 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
648
de103c93
CH		 649 transport_generic_request_failure(cmd,
650 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 651}
652
6138ed2a 653/*
d5829eac
PB		 654 * Used when asking transport to copy Sense Data from the underlying
655 * Linux/SCSI struct scsi_cmnd
6138ed2a 656 */
d5829eac 657static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 658{
6138ed2a 659 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 660
661 WARN_ON(!cmd->se_lun);
662
663 if (!dev)
d5829eac 664 return NULL;
6138ed2a 665
d5829eac
PB		 666 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
667 return NULL;
6138ed2a 668
9c58b7dd 669 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 670
d5829eac 671 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 672 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 673 return cmd->sense_buffer;
6138ed2a
PB		 674}
675
5787cacd 676void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 677{
42bf829e 678 struct se_device *dev = cmd->se_dev;
5787cacd 679 int success = scsi_status == GOOD;
c66ac9db 680 unsigned long flags;
c66ac9db 681
5787cacd
CH		 682 cmd->scsi_status = scsi_status;
683
684
a1d8b49a 685 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 686 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 687
c66ac9db 688 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 689 dev->transport->transport_complete(cmd,
690 cmd->t_data_sg,
691 transport_get_sense_buffer(cmd));
692 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 693 success = 1;
c66ac9db
NB		 694 }
695
696 /*
5787cacd 697 * See if we are waiting to complete for an exception condition.
c66ac9db 698 */
cf572a96 699 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 700 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 701 complete(&cmd->task_stop_comp);
c66ac9db
NB		 702 return;
703 }
2235007c 704
3d28934a 705 /*
125d0119 706 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 707 * and transport_wait_for_tasks() will be waiting for completion..
708 */
3b493f9f 709 if (cmd->transport_state & CMD_T_ABORTED ||
3d28934a
NB		 710 cmd->transport_state & CMD_T_STOP) {
711 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 712 complete_all(&cmd->t_transport_stop_comp);
3d28934a 713 return;
3dca1471 714 } else if (!success) {
35e0e757 715 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 716 } else {
35e0e757 717 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 718 }
35e0e757 719
35e0e757 720 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 721 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 722 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 723
35e0e757 724 queue_work(target_completion_wq, &cmd->work);
c66ac9db 725}
6bb35e00
CH		 726EXPORT_SYMBOL(target_complete_cmd);
727
2426bd45
RD		 728void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
729{
730 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
731 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
732 cmd->residual_count += cmd->data_length - length;
733 } else {
734 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
735 cmd->residual_count = cmd->data_length - length;
736 }
737
738 cmd->data_length = length;
739 }
740
741 target_complete_cmd(cmd, scsi_status);
742}
743EXPORT_SYMBOL(target_complete_cmd_with_length);
744
cf572a96 745static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 746{
cf572a96
CH		 747 struct se_device *dev = cmd->se_dev;
748 unsigned long flags;
c66ac9db 749
cf572a96
CH		 750 spin_lock_irqsave(&dev->execute_task_lock, flags);
751 if (!cmd->state_active) {
752 list_add_tail(&cmd->state_list, &dev->state_list);
753 cmd->state_active = true;
c66ac9db 754 }
cf572a96 755 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 756}
757
07bde79a 758/*
f147abb4 759 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 760 */
7a6f0a1e
CH		 761static void transport_write_pending_qf(struct se_cmd *cmd);
762static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 763
0fd97ccf 764void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 765{
766 struct se_device *dev = container_of(work, struct se_device,
767 qf_work_queue);
bcac364a 768 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 769 struct se_cmd *cmd, *cmd_tmp;
770
771 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 772 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
773 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 774
bcac364a 775 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 776 list_del(&cmd->se_qf_node);
33940d09 777 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 778
6708bb27 779 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 780 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 781 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 782 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
783 : "UNKNOWN");
f7a5cc0b 784
7a6f0a1e
CH		 785 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
786 transport_write_pending_qf(cmd);
787 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
788 transport_complete_qf(cmd);
07bde79a 789 }
07bde79a
NB		 790}
791
c66ac9db
NB		 792unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
793{
794 switch (cmd->data_direction) {
795 case DMA_NONE:
796 return "NONE";
797 case DMA_FROM_DEVICE:
798 return "READ";
799 case DMA_TO_DEVICE:
800 return "WRITE";
801 case DMA_BIDIRECTIONAL:
802 return "BIDI";
803 default:
804 break;
805 }
806
807 return "UNKNOWN";
808}
809
810void transport_dump_dev_state(
811 struct se_device *dev,
812 char *b,
813 int *bl)
814{
815 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 816 if (dev->export_count)
c66ac9db 817 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 818 else
c66ac9db 819 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 820
5f41a31d 821 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 822 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 823 dev->dev_attrib.block_size,
824 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 825 *bl += sprintf(b + *bl, " ");
826}
827
c66ac9db
NB		 828void transport_dump_vpd_proto_id(
829 struct t10_vpd *vpd,
830 unsigned char *p_buf,
831 int p_buf_len)
832{
833 unsigned char buf[VPD_TMP_BUF_SIZE];
834 int len;
835
836 memset(buf, 0, VPD_TMP_BUF_SIZE);
837 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
838
839 switch (vpd->protocol_identifier) {
840 case 0x00:
841 sprintf(buf+len, "Fibre Channel\n");
842 break;
843 case 0x10:
844 sprintf(buf+len, "Parallel SCSI\n");
845 break;
846 case 0x20:
847 sprintf(buf+len, "SSA\n");
848 break;
849 case 0x30:
850 sprintf(buf+len, "IEEE 1394\n");
851 break;
852 case 0x40:
853 sprintf(buf+len, "SCSI Remote Direct Memory Access"
854 " Protocol\n");
855 break;
856 case 0x50:
857 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
858 break;
859 case 0x60:
860 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
861 break;
862 case 0x70:
863 sprintf(buf+len, "Automation/Drive Interface Transport"
864 " Protocol\n");
865 break;
866 case 0x80:
867 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
868 break;
869 default:
870 sprintf(buf+len, "Unknown 0x%02x\n",
871 vpd->protocol_identifier);
872 break;
873 }
874
875 if (p_buf)
876 strncpy(p_buf, buf, p_buf_len);
877 else
6708bb27 878 pr_debug("%s", buf);
c66ac9db
NB		 879}
880
881void
882transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
883{
884 /*
885 * Check if the Protocol Identifier Valid (PIV) bit is set..
886 *
887 * from spc3r23.pdf section 7.5.1
888 */
889 if (page_83[1] & 0x80) {
890 vpd->protocol_identifier = (page_83[0] & 0xf0);
891 vpd->protocol_identifier_set = 1;
892 transport_dump_vpd_proto_id(vpd, NULL, 0);
893 }
894}
895EXPORT_SYMBOL(transport_set_vpd_proto_id);
896
897int transport_dump_vpd_assoc(
898 struct t10_vpd *vpd,
899 unsigned char *p_buf,
900 int p_buf_len)
901{
902 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 903 int ret = 0;
904 int len;
c66ac9db
NB		 905
906 memset(buf, 0, VPD_TMP_BUF_SIZE);
907 len = sprintf(buf, "T10 VPD Identifier Association: ");
908
909 switch (vpd->association) {
910 case 0x00:
911 sprintf(buf+len, "addressed logical unit\n");
912 break;
913 case 0x10:
914 sprintf(buf+len, "target port\n");
915 break;
916 case 0x20:
917 sprintf(buf+len, "SCSI target device\n");
918 break;
919 default:
920 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 921 ret = -EINVAL;
c66ac9db
NB		 922 break;
923 }
924
925 if (p_buf)
926 strncpy(p_buf, buf, p_buf_len);
927 else
6708bb27 928 pr_debug("%s", buf);
c66ac9db
NB		 929
930 return ret;
931}
932
933int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
934{
935 /*
936 * The VPD identification association..
937 *
938 * from spc3r23.pdf Section 7.6.3.1 Table 297
939 */
940 vpd->association = (page_83[1] & 0x30);
941 return transport_dump_vpd_assoc(vpd, NULL, 0);
942}
943EXPORT_SYMBOL(transport_set_vpd_assoc);
944
945int transport_dump_vpd_ident_type(
946 struct t10_vpd *vpd,
947 unsigned char *p_buf,
948 int p_buf_len)
949{
950 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 951 int ret = 0;
952 int len;
c66ac9db
NB		 953
954 memset(buf, 0, VPD_TMP_BUF_SIZE);
955 len = sprintf(buf, "T10 VPD Identifier Type: ");
956
957 switch (vpd->device_identifier_type) {
958 case 0x00:
959 sprintf(buf+len, "Vendor specific\n");
960 break;
961 case 0x01:
962 sprintf(buf+len, "T10 Vendor ID based\n");
963 break;
964 case 0x02:
965 sprintf(buf+len, "EUI-64 based\n");
966 break;
967 case 0x03:
968 sprintf(buf+len, "NAA\n");
969 break;
970 case 0x04:
971 sprintf(buf+len, "Relative target port identifier\n");
972 break;
973 case 0x08:
974 sprintf(buf+len, "SCSI name string\n");
975 break;
976 default:
977 sprintf(buf+len, "Unsupported: 0x%02x\n",
978 vpd->device_identifier_type);
e3d6f909 979 ret = -EINVAL;
c66ac9db
NB		 980 break;
981 }
982
e3d6f909
AG		 983 if (p_buf) {
984 if (p_buf_len < strlen(buf)+1)
985 return -EINVAL;
c66ac9db 986 strncpy(p_buf, buf, p_buf_len);
e3d6f909 987 } else {
6708bb27 988 pr_debug("%s", buf);
e3d6f909 989 }
c66ac9db
NB		 990
991 return ret;
992}
993
994int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
995{
996 /*
997 * The VPD identifier type..
998 *
999 * from spc3r23.pdf Section 7.6.3.1 Table 298
1000 */
1001 vpd->device_identifier_type = (page_83[1] & 0x0f);
1002 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1003}
1004EXPORT_SYMBOL(transport_set_vpd_ident_type);
1005
1006int transport_dump_vpd_ident(
1007 struct t10_vpd *vpd,
1008 unsigned char *p_buf,
1009 int p_buf_len)
1010{
1011 unsigned char buf[VPD_TMP_BUF_SIZE];
1012 int ret = 0;
1013
1014 memset(buf, 0, VPD_TMP_BUF_SIZE);
1015
1016 switch (vpd->device_identifier_code_set) {
1017 case 0x01: /* Binary */
703d641d
DC		 1018 snprintf(buf, sizeof(buf),
1019 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1020 &vpd->device_identifier[0]);
1021 break;
1022 case 0x02: /* ASCII */
703d641d
DC		 1023 snprintf(buf, sizeof(buf),
1024 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1025 &vpd->device_identifier[0]);
1026 break;
1027 case 0x03: /* UTF-8 */
703d641d
DC		 1028 snprintf(buf, sizeof(buf),
1029 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1030 &vpd->device_identifier[0]);
1031 break;
1032 default:
1033 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1034 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1035 ret = -EINVAL;
c66ac9db
NB		 1036 break;
1037 }
1038
1039 if (p_buf)
1040 strncpy(p_buf, buf, p_buf_len);
1041 else
6708bb27 1042 pr_debug("%s", buf);
c66ac9db
NB		 1043
1044 return ret;
1045}
1046
1047int
1048transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1049{
1050 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1051 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1052
1053 /*
1054 * The VPD Code Set (encoding)
1055 *
1056 * from spc3r23.pdf Section 7.6.3.1 Table 296
1057 */
1058 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1059 switch (vpd->device_identifier_code_set) {
1060 case 0x01: /* Binary */
1061 vpd->device_identifier[j++] =
1062 hex_str[vpd->device_identifier_type];
1063 while (i < (4 + page_83[3])) {
1064 vpd->device_identifier[j++] =
1065 hex_str[(page_83[i] & 0xf0) >> 4];
1066 vpd->device_identifier[j++] =
1067 hex_str[page_83[i] & 0x0f];
1068 i++;
1069 }
1070 break;
1071 case 0x02: /* ASCII */
1072 case 0x03: /* UTF-8 */
1073 while (i < (4 + page_83[3]))
1074 vpd->device_identifier[j++] = page_83[i++];
1075 break;
1076 default:
1077 break;
1078 }
1079
1080 return transport_dump_vpd_ident(vpd, NULL, 0);
1081}
1082EXPORT_SYMBOL(transport_set_vpd_ident);
1083
8f9b5654
NB		 1084static sense_reason_t
1085target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1086 unsigned int size)
1087{
1088 u32 mtl;
1089
1090 if (!cmd->se_tfo->max_data_sg_nents)
1091 return TCM_NO_SENSE;
1092 /*
1093 * Check if fabric enforced maximum SGL entries per I/O descriptor
1094 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1095 * residual_count and reduce original cmd->data_length to maximum
1096 * length based on single PAGE_SIZE entry scatter-lists.
1097 */
1098 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1099 if (cmd->data_length > mtl) {
1100 /*
1101 * If an existing CDB overflow is present, calculate new residual
1102 * based on CDB size minus fabric maximum transfer length.
1103 *
1104 * If an existing CDB underflow is present, calculate new residual
1105 * based on original cmd->data_length minus fabric maximum transfer
1106 * length.
1107 *
1108 * Otherwise, set the underflow residual based on cmd->data_length
1109 * minus fabric maximum transfer length.
1110 */
1111 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1112 cmd->residual_count = (size - mtl);
1113 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1114 u32 orig_dl = size + cmd->residual_count;
1115 cmd->residual_count = (orig_dl - mtl);
1116 } else {
1117 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1118 cmd->residual_count = (cmd->data_length - mtl);
1119 }
1120 cmd->data_length = mtl;
1121 /*
1122 * Reset sbc_check_prot() calculated protection payload
1123 * length based upon the new smaller MTL.
1124 */
1125 if (cmd->prot_length) {
1126 u32 sectors = (mtl / dev->dev_attrib.block_size);
1127 cmd->prot_length = dev->prot_length * sectors;
1128 }
1129 }
1130 return TCM_NO_SENSE;
1131}
1132
de103c93
CH		 1133sense_reason_t
1134target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1135{
1136 struct se_device *dev = cmd->se_dev;
1137
1138 if (cmd->unknown_data_length) {
1139 cmd->data_length = size;
1140 } else if (size != cmd->data_length) {
1141 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1142 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1143 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1144 cmd->data_length, size, cmd->t_task_cdb[0]);
1145
c72c5250
RD		 1146 if (cmd->data_direction == DMA_TO_DEVICE &&
1147 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1148 pr_err("Rejecting underflow/overflow WRITE data\n");
de103c93 1149 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1150 }
1151 /*
1152 * Reject READ_* or WRITE_* with overflow/underflow for
1153 * type SCF_SCSI_DATA_CDB.
1154 */
0fd97ccf 1155 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1156 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1157 " CDB on non 512-byte sector setup subsystem"
1158 " plugin: %s\n", dev->transport->name);
1159 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1160 return TCM_INVALID_CDB_FIELD;
9b3b8041 1161 }
4c054ba6
NB		 1162 /*
1163 * For the overflow case keep the existing fabric provided
1164 * ->data_length. Otherwise for the underflow case, reset
1165 * ->data_length to the smaller SCSI expected data transfer
1166 * length.
1167 */
9b3b8041
CH		 1168 if (size > cmd->data_length) {
1169 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1170 cmd->residual_count = (size - cmd->data_length);
1171 } else {
1172 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1173 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1174 cmd->data_length = size;
9b3b8041 1175 }
9b3b8041
CH		 1176 }
1177
8f9b5654 1178 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1179
9b3b8041
CH		 1180}
1181
c66ac9db
NB		 1182/*
1183 * Used by fabric modules containing a local struct se_cmd within their
1184 * fabric dependent per I/O descriptor.
649ee054
BVA		 1185 *
1186 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1187 */
1188void transport_init_se_cmd(
1189 struct se_cmd *cmd,
9ac8928e 1190 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1191 struct se_session *se_sess,
1192 u32 data_length,
1193 int data_direction,
1194 int task_attr,
1195 unsigned char *sense_buffer)
1196{
5951146d 1197 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1198 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1199 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1200 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1201 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1202 init_completion(&cmd->cmd_wait_comp);
cf572a96 1203 init_completion(&cmd->task_stop_comp);
a1d8b49a 1204 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1205 kref_init(&cmd->cmd_kref);
7d680f3b 1206 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1207
1208 cmd->se_tfo = tfo;
1209 cmd->se_sess = se_sess;
1210 cmd->data_length = data_length;
1211 cmd->data_direction = data_direction;
1212 cmd->sam_task_attr = task_attr;
1213 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1214
1215 cmd->state_active = false;
c66ac9db
NB		 1216}
1217EXPORT_SYMBOL(transport_init_se_cmd);
1218
de103c93
CH		 1219static sense_reason_t
1220transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1221{
019c4ca6
CH		 1222 struct se_device *dev = cmd->se_dev;
1223
c66ac9db
NB		 1224 /*
1225 * Check if SAM Task Attribute emulation is enabled for this
1226 * struct se_device storage object
1227 */
a3541703 1228 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1229 return 0;
1230
68d81f40 1231 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1232 pr_debug("SAM Task Attribute ACA"
c66ac9db 1233 " emulation is not supported\n");
de103c93 1234 return TCM_INVALID_CDB_FIELD;
c66ac9db 1235 }
9c31820b 1236
c66ac9db
NB		 1237 return 0;
1238}
1239
de103c93
CH		 1240sense_reason_t
1241target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1242{
0fd97ccf 1243 struct se_device *dev = cmd->se_dev;
de103c93 1244 sense_reason_t ret;
c66ac9db 1245
c66ac9db
NB		 1246 /*
1247 * Ensure that the received CDB is less than the max (252 + 8) bytes
1248 * for VARIABLE_LENGTH_CMD
1249 */
1250 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1251 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1252 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1253 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1254 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1255 }
1256 /*
1257 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1258 * allocate the additional extended CDB buffer now.. Otherwise
1259 * setup the pointer from __t_task_cdb to t_task_cdb.
1260 */
a1d8b49a
AG		 1261 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1262 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1263 GFP_KERNEL);
6708bb27
AG		 1264 if (!cmd->t_task_cdb) {
1265 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1266 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1267 scsi_command_size(cdb),
a1d8b49a 1268 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1269 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1270 }
1271 } else
a1d8b49a 1272 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1273 /*
a1d8b49a 1274 * Copy the original CDB into cmd->
c66ac9db 1275 */
a1d8b49a 1276 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1277
e5c0d6ad
RD		 1278 trace_target_sequencer_start(cmd);
1279
0fd97ccf 1280 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1281 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1282 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1283 cmd->se_tfo->get_fabric_name(),
1284 cmd->se_sess->se_node_acl->initiatorname,
1285 cmd->t_task_cdb[0]);
de103c93
CH		 1286 if (ret)
1287 return ret;
1288
1289 ret = transport_check_alloc_task_attr(cmd);
1290 if (ret)
c66ac9db 1291 return ret;
cb4f4d3c 1292
cb4f4d3c 1293 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1294 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1295 return 0;
1296}
a12f41f8 1297EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1298
695434e1
NB		 1299/*
1300 * Used by fabric module frontends to queue tasks directly.
1301 * Many only be used from process context only
1302 */
1303int transport_handle_cdb_direct(
1304 struct se_cmd *cmd)
1305{
de103c93 1306 sense_reason_t ret;
dd8ae59d 1307
695434e1
NB		 1308 if (!cmd->se_lun) {
1309 dump_stack();
6708bb27 1310 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1311 return -EINVAL;
1312 }
1313 if (in_interrupt()) {
1314 dump_stack();
6708bb27 1315 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1316 " from interrupt context\n");
1317 return -EINVAL;
1318 }
dd8ae59d 1319 /*
af877292
CH		 1320 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1321 * outstanding descriptors are handled correctly during shutdown via
1322 * transport_wait_for_tasks()
dd8ae59d
NB		 1323 *
1324 * Also, we don't take cmd->t_state_lock here as we only expect
1325 * this to be called for initial descriptor submission.
1326 */
1327 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1328 cmd->transport_state |= CMD_T_ACTIVE;
1329
dd8ae59d
NB		 1330 /*
1331 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1332 * so follow TRANSPORT_NEW_CMD processing thread context usage
1333 * and call transport_generic_request_failure() if necessary..
1334 */
1335 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1336 if (ret)
1337 transport_generic_request_failure(cmd, ret);
dd8ae59d 1338 return 0;
695434e1
NB		 1339}
1340EXPORT_SYMBOL(transport_handle_cdb_direct);
1341
c5ff8d6b 1342sense_reason_t
de103c93
CH		 1343transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1344 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1345{
1346 if (!sgl || !sgl_count)
1347 return 0;
1348
1349 /*
1350 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1351 * scatterlists already have been set to follow what the fabric
1352 * passes for the original expected data transfer length.
1353 */
1354 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1355 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1356 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1357 return TCM_INVALID_CDB_FIELD;
1358 }
1359
1360 cmd->t_data_sg = sgl;
1361 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1362 cmd->t_bidi_data_sg = sgl_bidi;
1363 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1364
de103c93
CH		 1365 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1366 return 0;
1367}
1368
a026757f
NB		 1369/*
1370 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1371 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1372 *
1373 * @se_cmd: command descriptor to submit
1374 * @se_sess: associated se_sess for endpoint
1375 * @cdb: pointer to SCSI CDB
1376 * @sense: pointer to SCSI sense buffer
1377 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1378 * @data_length: fabric expected data transfer length
1379 * @task_addr: SAM task attribute
1380 * @data_dir: DMA data direction
1381 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1382 * @sgl: struct scatterlist memory for unidirectional mapping
1383 * @sgl_count: scatterlist count for unidirectional mapping
1384 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1385 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1386 * @sgl_prot: struct scatterlist memory protection information
1387 * @sgl_prot_count: scatterlist count for protection information
a6360785 1388 *
649ee054
BVA		 1389 * Task tags are supported if the caller has set @se_cmd->tag.
1390 *
d6dfc868
RD		 1391 * Returns non zero to signal active I/O shutdown failure. All other
1392 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1393 * but still return zero here.
1394 *
a6360785
NB		 1395 * This may only be called from process context, and also currently
1396 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1397 */
1398int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1399 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1400 u32 data_length, int task_attr, int data_dir, int flags,
1401 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1402 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1403 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1404{
1405 struct se_portal_group *se_tpg;
de103c93
CH		 1406 sense_reason_t rc;
1407 int ret;
a6360785
NB		 1408
1409 se_tpg = se_sess->se_tpg;
1410 BUG_ON(!se_tpg);
1411 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1412 BUG_ON(in_interrupt());
1413 /*
1414 * Initialize se_cmd for target operation. From this point
1415 * exceptions are handled by sending exception status via
1416 * target_core_fabric_ops->queue_status() callback
1417 */
1418 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1419 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1420 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1421 se_cmd->unknown_data_length = 1;
a6360785
NB		 1422 /*
1423 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1424 * se_sess->sess_cmd_list. A second kref_get here is necessary
1425 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1426 * kref_put() to happen during fabric packet acknowledgement.
1427 */
afc16604 1428 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1429 if (ret)
1430 return ret;
a6360785
NB		 1431 /*
1432 * Signal bidirectional data payloads to target-core
1433 */
1434 if (flags & TARGET_SCF_BIDI_OP)
1435 se_cmd->se_cmd_flags |= SCF_BIDI;
1436 /*
1437 * Locate se_lun pointer and attach it to struct se_cmd
1438 */
de103c93
CH		 1439 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1440 if (rc) {
1441 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1442 target_put_sess_cmd(se_cmd);
d6dfc868 1443 return 0;
735703ca 1444 }
b5b8e298
SG		 1445
1446 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1447 if (rc != 0) {
1448 transport_generic_request_failure(se_cmd, rc);
1449 return 0;
1450 }
1451
def2b339
NB		 1452 /*
1453 * Save pointers for SGLs containing protection information,
1454 * if present.
1455 */
1456 if (sgl_prot_count) {
1457 se_cmd->t_prot_sg = sgl_prot;
1458 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1459 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1460 }
d6e0175c 1461
a026757f
NB		 1462 /*
1463 * When a non zero sgl_count has been passed perform SGL passthrough
1464 * mapping for pre-allocated fabric memory instead of having target
1465 * core perform an internal SGL allocation..
1466 */
1467 if (sgl_count != 0) {
1468 BUG_ON(!sgl);
1469
944981c7
NB		 1470 /*
1471 * A work-around for tcm_loop as some userspace code via
1472 * scsi-generic do not memset their associated read buffers,
1473 * so go ahead and do that here for type non-data CDBs. Also
1474 * note that this is currently guaranteed to be a single SGL
1475 * for this case by target core in target_setup_cmd_from_cdb()
1476 * -> transport_generic_cmd_sequencer().
1477 */
1478 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1479 se_cmd->data_direction == DMA_FROM_DEVICE) {
1480 unsigned char *buf = NULL;
1481
1482 if (sgl)
1483 buf = kmap(sg_page(sgl)) + sgl->offset;
1484
1485 if (buf) {
1486 memset(buf, 0, sgl->length);
1487 kunmap(sg_page(sgl));
1488 }
1489 }
1490
a026757f
NB		 1491 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1492 sgl_bidi, sgl_bidi_count);
1493 if (rc != 0) {
de103c93 1494 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1495 return 0;
1496 }
1497 }
def2b339 1498
11e319ed
AG		 1499 /*
1500 * Check if we need to delay processing because of ALUA
1501 * Active/NonOptimized primary access state..
1502 */
1503 core_alua_check_nonop_delay(se_cmd);
1504
a6360785 1505 transport_handle_cdb_direct(se_cmd);
d6dfc868 1506 return 0;
a6360785 1507}
a026757f
NB		 1508EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1509
1510/*
1511 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1512 *
1513 * @se_cmd: command descriptor to submit
1514 * @se_sess: associated se_sess for endpoint
1515 * @cdb: pointer to SCSI CDB
1516 * @sense: pointer to SCSI sense buffer
1517 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1518 * @data_length: fabric expected data transfer length
1519 * @task_addr: SAM task attribute
1520 * @data_dir: DMA data direction
1521 * @flags: flags for command submission from target_sc_flags_tables
1522 *
649ee054
BVA		 1523 * Task tags are supported if the caller has set @se_cmd->tag.
1524 *
a026757f
NB		 1525 * Returns non zero to signal active I/O shutdown failure. All other
1526 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1527 * but still return zero here.
1528 *
1529 * This may only be called from process context, and also currently
1530 * assumes internal allocation of fabric payload buffer by target-core.
1531 *
1532 * It also assumes interal target core SGL memory allocation.
1533 */
1534int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1535 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1536 u32 data_length, int task_attr, int data_dir, int flags)
1537{
1538 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1539 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1540 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1541}
a6360785
NB		 1542EXPORT_SYMBOL(target_submit_cmd);
1543
9f0d05c2
NB		 1544static void target_complete_tmr_failure(struct work_struct *work)
1545{
1546 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1547
1548 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1549 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1550
1551 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1552}
1553
ea98d7f9
AG		 1554/**
1555 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1556 * for TMR CDBs
1557 *
1558 * @se_cmd: command descriptor to submit
1559 * @se_sess: associated se_sess for endpoint
1560 * @sense: pointer to SCSI sense buffer
1561 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1562 * @fabric_context: fabric context for TMR req
1563 * @tm_type: Type of TM request
c0974f89
NB		 1564 * @gfp: gfp type for caller
1565 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1566 * @flags: submit cmd flags
ea98d7f9
AG		 1567 *
1568 * Callable from all contexts.
1569 **/
1570
c7042cae 1571int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1572 unsigned char *sense, u64 unpacked_lun,
c0974f89
NB		 1573 void *fabric_tmr_ptr, unsigned char tm_type,
1574 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1575{
1576 struct se_portal_group *se_tpg;
1577 int ret;
1578
1579 se_tpg = se_sess->se_tpg;
1580 BUG_ON(!se_tpg);
1581
1582 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1583 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1584 /*
1585 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1586 * allocation failure.
1587 */
c0974f89 1588 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1589 if (ret < 0)
1590 return -ENOMEM;
ea98d7f9 1591
c0974f89
NB		 1592 if (tm_type == TMR_ABORT_TASK)
1593 se_cmd->se_tmr_req->ref_task_tag = tag;
1594
ea98d7f9 1595 /* See target_submit_cmd for commentary */
afc16604 1596 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1597 if (ret) {
1598 core_tmr_release_req(se_cmd->se_tmr_req);
1599 return ret;
1600 }
ea98d7f9 1601
ea98d7f9
AG		 1602 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1603 if (ret) {
9f0d05c2
NB		 1604 /*
1605 * For callback during failure handling, push this work off
1606 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1607 */
1608 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1609 schedule_work(&se_cmd->work);
c7042cae 1610 return 0;
ea98d7f9
AG		 1611 }
1612 transport_generic_handle_tmr(se_cmd);
c7042cae 1613 return 0;
ea98d7f9
AG		 1614}
1615EXPORT_SYMBOL(target_submit_tmr);
1616
cdbb70bb 1617/*
cf572a96 1618 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1619 * has completed.
1620 */
cf572a96 1621bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cb0df4d3
BVA		 1622 __releases(&cmd->t_state_lock)
1623 __acquires(&cmd->t_state_lock)
cdbb70bb 1624{
cdbb70bb
CH		 1625 bool was_active = false;
1626
cf572a96
CH		 1627 if (cmd->transport_state & CMD_T_BUSY) {
1628 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1629 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1630
cf572a96
CH		 1631 pr_debug("cmd %p waiting to complete\n", cmd);
1632 wait_for_completion(&cmd->task_stop_comp);
1633 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1634
1635 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1636 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1637 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1638 was_active = true;
1639 }
1640
cdbb70bb
CH		 1641 return was_active;
1642}
1643
c66ac9db
NB		 1644/*
1645 * Handle SAM-esque emulation for generic transport request failures.
1646 */
de103c93
CH		 1647void transport_generic_request_failure(struct se_cmd *cmd,
1648 sense_reason_t sense_reason)
c66ac9db 1649{
057085e5 1650 int ret = 0, post_ret = 0;
07bde79a 1651
649ee054
BVA		 1652 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1653 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1654 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1655 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1656 cmd->t_state, sense_reason);
d43d6aea 1657 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1658 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1659 (cmd->transport_state & CMD_T_STOP) != 0,
1660 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1661
c66ac9db
NB		 1662 /*
1663 * For SAM Task Attribute emulation for failed struct se_cmd
1664 */
019c4ca6 1665 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1666 /*
1667 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1668 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1669 */
1670 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1671 cmd->transport_complete_callback)
057085e5 1672 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1673
de103c93 1674 switch (sense_reason) {
03e98c9e
NB		 1675 case TCM_NON_EXISTENT_LUN:
1676 case TCM_UNSUPPORTED_SCSI_OPCODE:
1677 case TCM_INVALID_CDB_FIELD:
1678 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1679 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1680 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1681 case TCM_UNKNOWN_MODE_PAGE:
1682 case TCM_WRITE_PROTECTED:
e2397c70 1683 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1684 case TCM_CHECK_CONDITION_ABORT_CMD:
1685 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1686 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1687 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1688 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1689 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
f4186e0b 1690 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
c66ac9db 1691 break;
de103c93
CH		 1692 case TCM_OUT_OF_RESOURCES:
1693 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1694 break;
03e98c9e 1695 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1696 /*
1697 * No SENSE Data payload for this case, set SCSI Status
1698 * and queue the response to $FABRIC_MOD.
1699 *
1700 * Uses linux/include/scsi/scsi.h SAM status codes defs
1701 */
1702 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1703 /*
1704 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1705 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1706 * CONFLICT STATUS.
1707 *
1708 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1709 */
e3d6f909 1710 if (cmd->se_sess &&
c51c8e7b
HR		 1711 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1712 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1713 cmd->orig_fe_lun, 0x2C,
1714 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1715 }
e5c0d6ad 1716 trace_target_cmd_complete(cmd);
c51c8e7b 1717 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1718 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1719 goto queue_full;
c66ac9db 1720 goto check_stop;
c66ac9db 1721 default:
6708bb27 1722 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1723 cmd->t_task_cdb[0], sense_reason);
1724 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1725 break;
1726 }
f3146437 1727
de103c93 1728 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1729 if (ret == -EAGAIN || ret == -ENOMEM)
1730 goto queue_full;
07bde79a 1731
c66ac9db
NB		 1732check_stop:
1733 transport_lun_remove_cmd(cmd);
06b967e4 1734 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1735 return;
1736
1737queue_full:
e057f533
CH		 1738 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1739 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1740}
2fbff127 1741EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1742
6492c1c5 1743void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
c66ac9db 1744{
de103c93 1745 sense_reason_t ret;
5f41a31d 1746
6492c1c5
NB		 1747 if (!cmd->execute_cmd) {
1748 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1749 goto err;
1750 }
1751 if (do_checks) {
1752 /*
1753 * Check for an existing UNIT ATTENTION condition after
1754 * target_handle_task_attr() has done SAM task attr
1755 * checking, and possibly have already defered execution
1756 * out to target_restart_delayed_cmds() context.
1757 */
1758 ret = target_scsi3_ua_check(cmd);
1759 if (ret)
1760 goto err;
1761
1762 ret = target_alua_state_check(cmd);
1763 if (ret)
1764 goto err;
5f41a31d 1765
6492c1c5
NB		 1766 ret = target_check_reservation(cmd);
1767 if (ret) {
1768 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1769 goto err;
de103c93 1770 }
5f41a31d 1771 }
6492c1c5
NB		 1772
1773 ret = cmd->execute_cmd(cmd);
1774 if (!ret)
1775 return;
1776err:
1777 spin_lock_irq(&cmd->t_state_lock);
1778 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1779 spin_unlock_irq(&cmd->t_state_lock);
1780
1781 transport_generic_request_failure(cmd, ret);
5f41a31d
CH		 1782}
1783
aa58b531
NB		 1784static int target_write_prot_action(struct se_cmd *cmd)
1785{
5132d1e6 1786 u32 sectors;
aa58b531
NB		 1787 /*
1788 * Perform WRITE_INSERT of PI using software emulation when backend
1789 * device has PI enabled, if the transport has not already generated
1790 * PI using hardware WRITE_INSERT offload.
1791 */
1792 switch (cmd->prot_op) {
1793 case TARGET_PROT_DOUT_INSERT:
1794 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1795 sbc_dif_generate(cmd);
1796 break;
5132d1e6
NB		 1797 case TARGET_PROT_DOUT_STRIP:
1798 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1799 break;
1800
1801 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1802 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1803 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1804 if (unlikely(cmd->pi_err)) {
1805 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1806 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1807 spin_unlock_irq(&cmd->t_state_lock);
1808 transport_generic_request_failure(cmd, cmd->pi_err);
1809 return -1;
1810 }
1811 break;
aa58b531
NB		 1812 default:
1813 break;
1814 }
1815
1816 return 0;
1817}
1818
019c4ca6 1819static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1820{
1821 struct se_device *dev = cmd->se_dev;
1822
a3541703 1823 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1824 return false;
5f41a31d 1825
f5ba9a6e
NB		 1826 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1827
c66ac9db 1828 /*
25985edc 1829 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1830 * to allow the passed struct se_cmd list of tasks to the front of the list.
1831 */
5f41a31d 1832 switch (cmd->sam_task_attr) {
68d81f40 1833 case TCM_HEAD_TAG:
9c31820b
RD		 1834 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1835 cmd->t_task_cdb[0]);
019c4ca6 1836 return false;
68d81f40 1837 case TCM_ORDERED_TAG:
33940d09 1838 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1839
9c31820b
RD		 1840 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1841 cmd->t_task_cdb[0]);
5f41a31d 1842
c66ac9db 1843 /*
5f41a31d
CH		 1844 * Execute an ORDERED command if no other older commands
1845 * exist that need to be completed first.
c66ac9db 1846 */
5f41a31d 1847 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1848 return false;
5f41a31d
CH		 1849 break;
1850 default:
c66ac9db
NB		 1851 /*
1852 * For SIMPLE and UNTAGGED Task Attribute commands
1853 */
33940d09 1854 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1855 break;
c66ac9db 1856 }
5f41a31d 1857
019c4ca6
CH		 1858 if (atomic_read(&dev->dev_ordered_sync) == 0)
1859 return false;
c66ac9db 1860
019c4ca6
CH		 1861 spin_lock(&dev->delayed_cmd_lock);
1862 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1863 spin_unlock(&dev->delayed_cmd_lock);
1864
9c31820b
RD		 1865 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1866 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1867 return true;
1868}
1869
b9d99202
NB		 1870static int __transport_check_aborted_status(struct se_cmd *, int);
1871
019c4ca6
CH		 1872void target_execute_cmd(struct se_cmd *cmd)
1873{
019c4ca6
CH		 1874 /*
1875 * Determine if frontend context caller is requesting the stopping of
1876 * this command for frontend exceptions.
b9d99202
NB		 1877 *
1878 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1879 */
4a9a6c8d 1880 spin_lock_irq(&cmd->t_state_lock);
b9d99202
NB		 1881 if (__transport_check_aborted_status(cmd, 1)) {
1882 spin_unlock_irq(&cmd->t_state_lock);
1883 return;
1884 }
019c4ca6 1885 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1886 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1887 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1888
1889 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1890 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1891 return;
1892 }
1893
1894 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1895 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1896 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1897
1898 if (target_write_prot_action(cmd))
1899 return;
019c4ca6 1900
1a398b97
NB		 1901 if (target_handle_task_attr(cmd)) {
1902 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1903 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1904 spin_unlock_irq(&cmd->t_state_lock);
1905 return;
1906 }
1907
6492c1c5 1908 __target_execute_cmd(cmd, true);
c66ac9db 1909}
70baf0ab 1910EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1911
5f41a31d
CH		 1912/*
1913 * Process all commands up to the last received ORDERED task attribute which
1914 * requires another blocking boundary
1915 */
1916static void target_restart_delayed_cmds(struct se_device *dev)
1917{
1918 for (;;) {
1919 struct se_cmd *cmd;
1920
1921 spin_lock(&dev->delayed_cmd_lock);
1922 if (list_empty(&dev->delayed_cmd_list)) {
1923 spin_unlock(&dev->delayed_cmd_lock);
1924 break;
1925 }
1926
1927 cmd = list_entry(dev->delayed_cmd_list.next,
1928 struct se_cmd, se_delayed_node);
1929 list_del(&cmd->se_delayed_node);
1930 spin_unlock(&dev->delayed_cmd_lock);
1931
6492c1c5 1932 __target_execute_cmd(cmd, true);
5f41a31d 1933
68d81f40 1934 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1935 break;
1936 }
1937}
1938
c66ac9db 1939/*
35e0e757 1940 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1941 * and ordered cmds need to have their tasks added to the execution queue.
1942 */
1943static void transport_complete_task_attr(struct se_cmd *cmd)
1944{
5951146d 1945 struct se_device *dev = cmd->se_dev;
c66ac9db 1946
a3541703 1947 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1948 return;
1949
f5ba9a6e
NB		 1950 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
1951 goto restart;
1952
68d81f40 1953 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1954 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1955 dev->dev_cur_ordered_id++;
9c31820b
RD		 1956 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1957 dev->dev_cur_ordered_id);
68d81f40 1958 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1959 dev->dev_cur_ordered_id++;
9c31820b
RD		 1960 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1961 dev->dev_cur_ordered_id);
68d81f40 1962 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1963 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1964
1965 dev->dev_cur_ordered_id++;
9c31820b
RD		 1966 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1967 dev->dev_cur_ordered_id);
c66ac9db 1968 }
f5ba9a6e 1969restart:
5f41a31d 1970 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1971}
1972
e057f533 1973static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1974{
1975 int ret = 0;
1976
019c4ca6 1977 transport_complete_task_attr(cmd);
e057f533
CH		 1978
1979 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1980 trace_target_cmd_complete(cmd);
e057f533 1981 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1982 goto out;
e057f533 1983 }
07bde79a
NB		 1984
1985 switch (cmd->data_direction) {
1986 case DMA_FROM_DEVICE:
e5c0d6ad 1987 trace_target_cmd_complete(cmd);
07bde79a
NB		 1988 ret = cmd->se_tfo->queue_data_in(cmd);
1989 break;
1990 case DMA_TO_DEVICE:
64577407 1991 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1992 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1993 break;
07bde79a
NB		 1994 }
1995 /* Fall through for DMA_TO_DEVICE */
1996 case DMA_NONE:
e5c0d6ad 1997 trace_target_cmd_complete(cmd);
07bde79a
NB		 1998 ret = cmd->se_tfo->queue_status(cmd);
1999 break;
2000 default:
2001 break;
2002 }
2003
e057f533
CH		 2004out:
2005 if (ret < 0) {
2006 transport_handle_queue_full(cmd, cmd->se_dev);
2007 return;
2008 }
2009 transport_lun_remove_cmd(cmd);
2010 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2011}
2012
2013static void transport_handle_queue_full(
2014 struct se_cmd *cmd,
e057f533 2015 struct se_device *dev)
07bde79a
NB		 2016{
2017 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2018 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2019 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2020 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2021
2022 schedule_work(&cmd->se_dev->qf_work_queue);
2023}
2024
fdeab852 2025static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2026{
fdeab852
NB		 2027 switch (cmd->prot_op) {
2028 case TARGET_PROT_DIN_STRIP:
2029 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2030 u32 sectors = cmd->data_length >>
2031 ilog2(cmd->se_dev->dev_attrib.block_size);
2032
2033 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2034 sectors, 0, cmd->t_prot_sg,
2035 0);
2036 if (cmd->pi_err)
fdeab852 2037 return true;
bc005869 2038 }
fdeab852 2039 break;
72c03850
NB		 2040 case TARGET_PROT_DIN_INSERT:
2041 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2042 break;
2043
2044 sbc_dif_generate(cmd);
2045 break;
fdeab852
NB		 2046 default:
2047 break;
bc005869
NB		 2048 }
2049
2050 return false;
2051}
2052
35e0e757 2053static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2054{
35e0e757 2055 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2056 int ret;
35e0e757 2057
c66ac9db
NB		 2058 /*
2059 * Check if we need to move delayed/dormant tasks from cmds on the
2060 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2061 * Attribute.
2062 */
019c4ca6
CH		 2063 transport_complete_task_attr(cmd);
2064
07bde79a
NB		 2065 /*
2066 * Check to schedule QUEUE_FULL work, or execute an existing
2067 * cmd->transport_qf_callback()
2068 */
2069 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2070 schedule_work(&cmd->se_dev->qf_work_queue);
2071
c66ac9db 2072 /*
d5829eac 2073 * Check if we need to send a sense buffer from
c66ac9db
NB		 2074 * the struct se_cmd in question.
2075 */
2076 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2077 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2078 ret = transport_send_check_condition_and_sense(
2079 cmd, 0, 1);
2080 if (ret == -EAGAIN || ret == -ENOMEM)
2081 goto queue_full;
2082
2083 transport_lun_remove_cmd(cmd);
2084 transport_cmd_check_stop_to_fabric(cmd);
2085 return;
c66ac9db
NB		 2086 }
2087 /*
25985edc 2088 * Check for a callback, used by amongst other things
a6b0133c 2089 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2090 */
a6b0133c
NB		 2091 if (cmd->transport_complete_callback) {
2092 sense_reason_t rc;
057085e5
NB		 2093 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2094 bool zero_dl = !(cmd->data_length);
2095 int post_ret = 0;
a6b0133c 2096
057085e5
NB		 2097 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2098 if (!rc && !post_ret) {
2099 if (caw && zero_dl)
c8e63985
NB		 2100 goto queue_rsp;
2101
a6b0133c 2102 return;
a2890087
NB		 2103 } else if (rc) {
2104 ret = transport_send_check_condition_and_sense(cmd,
2105 rc, 0);
2106 if (ret == -EAGAIN || ret == -ENOMEM)
2107 goto queue_full;
a6b0133c 2108
a2890087
NB		 2109 transport_lun_remove_cmd(cmd);
2110 transport_cmd_check_stop_to_fabric(cmd);
2111 return;
2112 }
a6b0133c 2113 }
c66ac9db 2114
c8e63985 2115queue_rsp:
c66ac9db
NB		 2116 switch (cmd->data_direction) {
2117 case DMA_FROM_DEVICE:
4cc987ea
NB		 2118 atomic_long_add(cmd->data_length,
2119 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2120 /*
2121 * Perform READ_STRIP of PI using software emulation when
2122 * backend had PI enabled, if the transport will not be
2123 * performing hardware READ_STRIP offload.
2124 */
fdeab852 2125 if (target_read_prot_action(cmd)) {
bc005869
NB		 2126 ret = transport_send_check_condition_and_sense(cmd,
2127 cmd->pi_err, 0);
2128 if (ret == -EAGAIN || ret == -ENOMEM)
2129 goto queue_full;
2130
2131 transport_lun_remove_cmd(cmd);
2132 transport_cmd_check_stop_to_fabric(cmd);
2133 return;
2134 }
c66ac9db 2135
e5c0d6ad 2136 trace_target_cmd_complete(cmd);
07bde79a 2137 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2138 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2139 goto queue_full;
c66ac9db
NB		 2140 break;
2141 case DMA_TO_DEVICE:
4cc987ea
NB		 2142 atomic_long_add(cmd->data_length,
2143 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2144 /*
2145 * Check if we need to send READ payload for BIDI-COMMAND
2146 */
64577407 2147 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2148 atomic_long_add(cmd->data_length,
2149 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2150 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2151 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2152 goto queue_full;
c66ac9db
NB		 2153 break;
2154 }
2155 /* Fall through for DMA_TO_DEVICE */
2156 case DMA_NONE:
e5c0d6ad 2157 trace_target_cmd_complete(cmd);
07bde79a 2158 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2159 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2160 goto queue_full;
c66ac9db
NB		 2161 break;
2162 default:
2163 break;
2164 }
2165
2166 transport_lun_remove_cmd(cmd);
2167 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2168 return;
2169
2170queue_full:
6708bb27 2171 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2172 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2173 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2174 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2175}
2176
6708bb27 2177static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2178{
ec98f782 2179 struct scatterlist *sg;
ec98f782 2180 int count;
c66ac9db 2181
6708bb27
AG		 2182 for_each_sg(sgl, sg, nents, count)
2183 __free_page(sg_page(sg));
c66ac9db 2184
6708bb27
AG		 2185 kfree(sgl);
2186}
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
AM		 2206 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2207 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
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) {
2218 transport_free_sgl(cmd->t_bidi_data_sg,
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
AG		 2227
2228 transport_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
6708bb27 2232 transport_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/**
3b493f9f
NB		 2238 * transport_put_cmd - release a reference to a command
2239 * @cmd: command to release
e26d99ae 2240 *
3b493f9f 2241 * This routine releases our reference to the command and frees it if possible.
e26d99ae 2242 */
3b493f9f 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
NB		 2305target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2306 bool zero_page)
c66ac9db 2307{
20093994 2308 struct scatterlist *sg;
ec98f782 2309 struct page *page;
20093994
NB		 2310 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2311 unsigned int nent;
ec98f782 2312 int i = 0;
c66ac9db 2313
20093994
NB		 2314 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2315 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2316 if (!sg)
ec98f782 2317 return -ENOMEM;
c66ac9db 2318
20093994 2319 sg_init_table(sg, nent);
9db9da33 2320
ec98f782
AG		 2321 while (length) {
2322 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2323 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2324 if (!page)
2325 goto out;
c66ac9db 2326
20093994 2327 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2328 length -= page_len;
2329 i++;
c66ac9db 2330 }
20093994
NB		 2331 *sgl = sg;
2332 *nents = nent;
c66ac9db 2333 return 0;
c66ac9db 2334
ec98f782 2335out:
d0e27c88 2336 while (i > 0) {
ec98f782 2337 i--;
20093994 2338 __free_page(sg_page(&sg[i]));
c66ac9db 2339 }
20093994 2340 kfree(sg);
ec98f782 2341 return -ENOMEM;
c66ac9db
NB		 2342}
2343
da0f7619 2344/*
b16a35b0
AG		 2345 * Allocate any required resources to execute the command. For writes we
2346 * might not have the payload yet, so notify the fabric via a call to
2347 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2348 */
de103c93
CH		 2349sense_reason_t
2350transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2351{
c66ac9db 2352 int ret = 0;
c8e63985 2353 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2354
5835812f
AM		 2355 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2356 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2357 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2358 cmd->prot_length, true);
2359 if (ret < 0)
2360 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2361 }
2362
c66ac9db
NB		 2363 /*
2364 * Determine is the TCM fabric module has already allocated physical
2365 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2366 * beforehand.
c66ac9db 2367 */
ec98f782
AG		 2368 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2369 cmd->data_length) {
20093994 2370
8cefe07b
NB		 2371 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2372 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2373 u32 bidi_length;
2374
2375 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2376 bidi_length = cmd->t_task_nolb *
2377 cmd->se_dev->dev_attrib.block_size;
2378 else
2379 bidi_length = cmd->data_length;
2380
2381 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2382 &cmd->t_bidi_data_nents,
2383 bidi_length, zero_flag);
2384 if (ret < 0)
2385 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2386 }
2387
20093994
NB		 2388 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2389 cmd->data_length, zero_flag);
c66ac9db 2390 if (ret < 0)
de103c93 2391 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2392 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2393 cmd->data_length) {
2394 /*
2395 * Special case for COMPARE_AND_WRITE with fabrics
2396 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2397 */
2398 u32 caw_length = cmd->t_task_nolb *
2399 cmd->se_dev->dev_attrib.block_size;
2400
2401 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2402 &cmd->t_bidi_data_nents,
2403 caw_length, zero_flag);
2404 if (ret < 0)
2405 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2406 }
c66ac9db 2407 /*
c3196f0c
CH		 2408 * If this command is not a write we can execute it right here,
2409 * for write buffers we need to notify the fabric driver first
2410 * and let it call back once the write buffers are ready.
c66ac9db 2411 */
5f41a31d 2412 target_add_to_state_list(cmd);
885e7b0e 2413 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2414 target_execute_cmd(cmd);
2415 return 0;
2416 }
862e6389 2417 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2418
2419 ret = cmd->se_tfo->write_pending(cmd);
2420 if (ret == -EAGAIN || ret == -ENOMEM)
2421 goto queue_full;
2422
de103c93
CH		 2423 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2424 WARN_ON(ret);
2425
b69c1fcf 2426 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2427
c3196f0c
CH		 2428queue_full:
2429 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2430 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2431 transport_handle_queue_full(cmd, cmd->se_dev);
2432 return 0;
c66ac9db 2433}
a1d8b49a 2434EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2435
e057f533 2436static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2437{
f147abb4
NB		 2438 int ret;
2439
2440 ret = cmd->se_tfo->write_pending(cmd);
2441 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2442 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2443 cmd);
2444 transport_handle_queue_full(cmd, cmd->se_dev);
2445 }
07bde79a
NB		 2446}
2447
fb6a326e
NB		 2448static bool
2449__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2450 unsigned long *flags);
2451
2452static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2453{
2454 unsigned long flags;
2455
2456 spin_lock_irqsave(&cmd->t_state_lock, flags);
2457 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2458 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2459}
2460
d5ddad41 2461int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2462{
d5ddad41 2463 int ret = 0;
fb6a326e 2464 bool aborted = false, tas = false;
d5ddad41 2465
d14921d6 2466 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2467 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
fb6a326e 2468 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2469
fb6a326e
NB		 2470 if (!aborted || tas)
2471 ret = transport_put_cmd(cmd);
d14921d6
NB		 2472 } else {
2473 if (wait_for_tasks)
fb6a326e 2474 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2475 /*
2476 * Handle WRITE failure case where transport_generic_new_cmd()
2477 * has already added se_cmd to state_list, but fabric has
2478 * failed command before I/O submission.
2479 */
3b493f9f 2480 if (cmd->state_active)
c130480b 2481 target_remove_from_state_list(cmd);
d14921d6 2482
82f1c8a4 2483 if (cmd->se_lun)
c66ac9db 2484 transport_lun_remove_cmd(cmd);
c66ac9db 2485
fb6a326e
NB		 2486 if (!aborted || tas)
2487 ret = transport_put_cmd(cmd);
2488 }
2489 /*
2490 * If the task has been internally aborted due to TMR ABORT_TASK
2491 * or LUN_RESET, target_core_tmr.c is responsible for performing
2492 * the remaining calls to target_put_sess_cmd(), and not the
2493 * callers of this function.
2494 */
2495 if (aborted) {
2496 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2497 wait_for_completion(&cmd->cmd_wait_comp);
2498 cmd->se_tfo->release_cmd(cmd);
2499 ret = 1;
c66ac9db 2500 }
d5ddad41 2501 return ret;
c66ac9db
NB		 2502}
2503EXPORT_SYMBOL(transport_generic_free_cmd);
2504
a17f091d 2505/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2506 * @se_cmd: command descriptor to add
a6360785 2507 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2508 */
afc16604 2509int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2510{
afc16604 2511 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2512 unsigned long flags;
bc187ea6 2513 int ret = 0;
a17f091d 2514
a6360785
NB		 2515 /*
2516 * Add a second kref if the fabric caller is expecting to handle
2517 * fabric acknowledgement that requires two target_put_sess_cmd()
2518 * invocations before se_cmd descriptor release.
2519 */
56661d2b 2520 if (ack_kref) {
a6360785 2521 kref_get(&se_cmd->cmd_kref);
56661d2b
NB		 2522 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2523 }
7481deb4 2524
a17f091d 2525 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2526 if (se_sess->sess_tearing_down) {
2527 ret = -ESHUTDOWN;
2528 goto out;
2529 }
a17f091d 2530 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2531out:
a17f091d 2532 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2533
2534 if (ret && ack_kref)
afc16604 2535 target_put_sess_cmd(se_cmd);
7544e597 2536
bc187ea6 2537 return ret;
a17f091d 2538}
20361e69 2539EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2540
3b493f9f
NB		 2541static void target_free_cmd_mem(struct se_cmd *cmd)
2542{
2543 transport_free_pages(cmd);
2544
2545 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2546 core_tmr_release_req(cmd->se_tmr_req);
2547 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2548 kfree(cmd->t_task_cdb);
2549}
2550
7481deb4 2551static void target_release_cmd_kref(struct kref *kref)
a17f091d 2552{
7481deb4
NB		 2553 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2554 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2555 unsigned long flags;
fb6a326e 2556 bool fabric_stop;
a17f091d 2557
9ff9d15e 2558 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
fb6a326e
NB		 2559
2560 spin_lock(&se_cmd->t_state_lock);
f318588b
NB		 2561 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2562 (se_cmd->transport_state & CMD_T_ABORTED);
fb6a326e
NB		 2563 spin_unlock(&se_cmd->t_state_lock);
2564
2565 if (se_cmd->cmd_wait_set || fabric_stop) {
2566 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2567 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3b493f9f 2568 target_free_cmd_mem(se_cmd);
a17f091d 2569 complete(&se_cmd->cmd_wait_comp);
7481deb4 2570 return;
a17f091d 2571 }
fb6a326e 2572 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2573 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2574
3b493f9f 2575 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2576 se_cmd->se_tfo->release_cmd(se_cmd);
2577}
2578
2579/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2580 * @se_cmd: command descriptor to drop
2581 */
afc16604 2582int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2583{
afc16604
BVA		 2584 struct se_session *se_sess = se_cmd->se_sess;
2585
0ed6e189 2586 if (!se_sess) {
3b493f9f 2587 target_free_cmd_mem(se_cmd);
0ed6e189
NB		 2588 se_cmd->se_tfo->release_cmd(se_cmd);
2589 return 1;
2590 }
9ff9d15e 2591 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2592}
2593EXPORT_SYMBOL(target_put_sess_cmd);
2594
1c7b13fe
RD		 2595/* target_sess_cmd_list_set_waiting - Flag all commands in
2596 * sess_cmd_list to complete cmd_wait_comp. Set
2597 * sess_tearing_down so no more commands are queued.
2598 * @se_sess: session to flag
a17f091d 2599 */
1c7b13fe 2600void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2601{
2602 struct se_cmd *se_cmd;
2603 unsigned long flags;
fb6a326e 2604 int rc;
a17f091d 2605
a17f091d 2606 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2607 if (se_sess->sess_tearing_down) {
2608 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2609 return;
2610 }
1c7b13fe 2611 se_sess->sess_tearing_down = 1;
9b31a328 2612 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2613
fb6a326e
NB		 2614 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) {
2615 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2616 if (rc) {
2617 se_cmd->cmd_wait_set = 1;
2618 spin_lock(&se_cmd->t_state_lock);
2619 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2620 spin_unlock(&se_cmd->t_state_lock);
2621 }
2622 }
a17f091d
NB		 2623
2624 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2625}
1c7b13fe 2626EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2627
2628/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2629 * @se_sess: session to wait for active I/O
a17f091d 2630 */
be646c2d 2631void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2632{
2633 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2634 unsigned long flags;
fb6a326e 2635 bool tas;
a17f091d
NB		 2636
2637 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2638 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2639 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2640 " %d\n", se_cmd, se_cmd->t_state,
2641 se_cmd->se_tfo->get_cmd_state(se_cmd));
2642
fb6a326e
NB		 2643 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2644 tas = (se_cmd->transport_state & CMD_T_TAS);
2645 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2646
2647 if (!target_put_sess_cmd(se_cmd)) {
2648 if (tas)
2649 target_put_sess_cmd(se_cmd);
2650 }
2651
be646c2d
JE		 2652 wait_for_completion(&se_cmd->cmd_wait_comp);
2653 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2654 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2655 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2656
2657 se_cmd->se_tfo->release_cmd(se_cmd);
2658 }
9b31a328
NB		 2659
2660 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2661 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2662 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2663
a17f091d
NB		 2664}
2665EXPORT_SYMBOL(target_wait_for_sess_cmds);
2666
b3eeea66 2667void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2668{
5277797d 2669 percpu_ref_kill(&lun->lun_ref);
5277797d 2670 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2671}
2672
fb6a326e
NB		 2673static bool
2674__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2675 bool *aborted, bool *tas, unsigned long *flags)
2676 __releases(&cmd->t_state_lock)
2677 __acquires(&cmd->t_state_lock)
c66ac9db 2678{
c66ac9db 2679
fb6a326e
NB		 2680 assert_spin_locked(&cmd->t_state_lock);
2681 WARN_ON_ONCE(!irqs_disabled());
2682
2683 if (fabric_stop)
2684 cmd->transport_state |= CMD_T_FABRIC_STOP;
2685
2686 if (cmd->transport_state & CMD_T_ABORTED)
2687 *aborted = true;
2688
2689 if (cmd->transport_state & CMD_T_TAS)
2690 *tas = true;
2691
c8e31f26 2692 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
fb6a326e 2693 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2694 return false;
cb4f4d3c 2695
c8e31f26 2696 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
fb6a326e 2697 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2698 return false;
7d680f3b 2699
fb6a326e
NB		 2700 if (!(cmd->transport_state & CMD_T_ACTIVE))
2701 return false;
2702
2703 if (fabric_stop && *aborted)
a17f091d 2704 return false;
c66ac9db 2705
7d680f3b 2706 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2707
fb6a326e
NB		 2708 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2709 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2710 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2711
fb6a326e 2712 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2713
a1d8b49a 2714 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2715
fb6a326e 2716 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2717 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2718
fb6a326e
NB		 2719 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2720 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2721
fb6a326e
NB		 2722 return true;
2723}
2724
2725/**
2726 * transport_wait_for_tasks - wait for completion to occur
2727 * @cmd: command to wait
2728 *
2729 * Called from frontend fabric context to wait for storage engine
2730 * to pause and/or release frontend generated struct se_cmd.
2731 */
2732bool transport_wait_for_tasks(struct se_cmd *cmd)
2733{
2734 unsigned long flags;
2735 bool ret, aborted = false, tas = false;
2736
2737 spin_lock_irqsave(&cmd->t_state_lock, flags);
2738 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 2739 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2740
fb6a326e 2741 return ret;
c66ac9db 2742}
d14921d6 2743EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2744
ab78fef4
BVA		 2745struct sense_info {
2746 u8 key;
2747 u8 asc;
2748 u8 ascq;
2749 bool add_sector_info;
2750};
2751
2752static const struct sense_info sense_info_table[] = {
2753 [TCM_NO_SENSE] = {
2754 .key = NOT_READY
2755 },
2756 [TCM_NON_EXISTENT_LUN] = {
2757 .key = ILLEGAL_REQUEST,
2758 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2759 },
2760 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2761 .key = ILLEGAL_REQUEST,
2762 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2763 },
2764 [TCM_SECTOR_COUNT_TOO_MANY] = {
2765 .key = ILLEGAL_REQUEST,
2766 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2767 },
2768 [TCM_UNKNOWN_MODE_PAGE] = {
2769 .key = ILLEGAL_REQUEST,
2770 .asc = 0x24, /* INVALID FIELD IN CDB */
2771 },
2772 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2773 .key = ABORTED_COMMAND,
2774 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2775 .ascq = 0x03,
2776 },
2777 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2778 .key = ABORTED_COMMAND,
2779 .asc = 0x0c, /* WRITE ERROR */
2780 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2781 },
2782 [TCM_INVALID_CDB_FIELD] = {
2783 .key = ILLEGAL_REQUEST,
2784 .asc = 0x24, /* INVALID FIELD IN CDB */
2785 },
2786 [TCM_INVALID_PARAMETER_LIST] = {
2787 .key = ILLEGAL_REQUEST,
2788 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2789 },
2790 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2791 .key = ILLEGAL_REQUEST,
2792 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2793 },
2794 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2795 .key = ILLEGAL_REQUEST,
2796 .asc = 0x0c, /* WRITE ERROR */
2797 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2798 },
2799 [TCM_SERVICE_CRC_ERROR] = {
2800 .key = ABORTED_COMMAND,
2801 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2802 .ascq = 0x05, /* N/A */
2803 },
2804 [TCM_SNACK_REJECTED] = {
2805 .key = ABORTED_COMMAND,
2806 .asc = 0x11, /* READ ERROR */
2807 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2808 },
2809 [TCM_WRITE_PROTECTED] = {
2810 .key = DATA_PROTECT,
2811 .asc = 0x27, /* WRITE PROTECTED */
2812 },
2813 [TCM_ADDRESS_OUT_OF_RANGE] = {
2814 .key = ILLEGAL_REQUEST,
2815 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2816 },
2817 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2818 .key = UNIT_ATTENTION,
2819 },
2820 [TCM_CHECK_CONDITION_NOT_READY] = {
2821 .key = NOT_READY,
2822 },
2823 [TCM_MISCOMPARE_VERIFY] = {
2824 .key = MISCOMPARE,
2825 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2826 .ascq = 0x00,
2827 },
2828 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2829 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2830 .asc = 0x10,
2831 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2832 .add_sector_info = true,
2833 },
2834 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2835 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2836 .asc = 0x10,
2837 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2838 .add_sector_info = true,
2839 },
2840 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2841 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2842 .asc = 0x10,
2843 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2844 .add_sector_info = true,
2845 },
f4186e0b
NB		 2846 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
2847 .key = COPY_ABORTED,
2848 .asc = 0x0d,
2849 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
2850
2851 },
ab78fef4
BVA		 2852 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2853 /*
2854 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2855 * Solaris initiators. Returning NOT READY instead means the
2856 * operations will be retried a finite number of times and we
2857 * can survive intermittent errors.
2858 */
2859 .key = NOT_READY,
2860 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2861 },
2862};
2863
f5a8b3a7 2864static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2865{
2866 const struct sense_info *si;
2867 u8 *buffer = cmd->sense_buffer;
2868 int r = (__force int)reason;
2869 u8 asc, ascq;
4e4937e8 2870 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2871
2872 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2873 si = &sense_info_table[r];
2874 else
2875 si = &sense_info_table[(__force int)
2876 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2877
ab78fef4
BVA		 2878 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2879 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2880 WARN_ON_ONCE(asc == 0);
2881 } else if (si->asc == 0) {
2882 WARN_ON_ONCE(cmd->scsi_asc == 0);
2883 asc = cmd->scsi_asc;
2884 ascq = cmd->scsi_ascq;
2885 } else {
2886 asc = si->asc;
2887 ascq = si->ascq;
2888 }
9ec1e1ce 2889
4e4937e8 2890 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 2891 if (si->add_sector_info)
f5a8b3a7
SG		 2892 return scsi_set_sense_information(buffer,
2893 cmd->scsi_sense_length,
2894 cmd->bad_sector);
2895
2896 return 0;
ab78fef4
BVA		 2897}
2898
de103c93
CH		 2899int
2900transport_send_check_condition_and_sense(struct se_cmd *cmd,
2901 sense_reason_t reason, int from_transport)
c66ac9db 2902{
c66ac9db 2903 unsigned long flags;
c66ac9db 2904
a1d8b49a 2905 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2906 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2907 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2908 return 0;
2909 }
2910 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2911 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2912
ab78fef4 2913 if (!from_transport) {
f5a8b3a7
SG		 2914 int rc;
2915
c66ac9db 2916 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 2917 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2918 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 2919 rc = translate_sense_reason(cmd, reason);
2920 if (rc)
2921 return rc;
c66ac9db 2922 }
c66ac9db 2923
e5c0d6ad 2924 trace_target_cmd_complete(cmd);
07bde79a 2925 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2926}
2927EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2928
b9d99202
NB		 2929static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2930 __releases(&cmd->t_state_lock)
2931 __acquires(&cmd->t_state_lock)
c66ac9db 2932{
b9d99202
NB		 2933 assert_spin_locked(&cmd->t_state_lock);
2934 WARN_ON_ONCE(!irqs_disabled());
2935
c18bc7d8
RD		 2936 if (!(cmd->transport_state & CMD_T_ABORTED))
2937 return 0;
68259b5a
AL		 2938 /*
2939 * If cmd has been aborted but either no status is to be sent or it has
2940 * already been sent, just return
2941 */
b9d99202
NB		 2942 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
2943 if (send_status)
2944 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 2945 return 1;
b9d99202 2946 }
8b1e1244 2947
b9d99202
NB		 2948 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
2949 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2950
68259b5a 2951 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2952 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2953 trace_target_cmd_complete(cmd);
b9d99202
NB		 2954
2955 spin_unlock_irq(&cmd->t_state_lock);
c18bc7d8 2956 cmd->se_tfo->queue_status(cmd);
b9d99202 2957 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 2958
2959 return 1;
c66ac9db 2960}
b9d99202
NB		 2961
2962int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2963{
2964 int ret;
2965
2966 spin_lock_irq(&cmd->t_state_lock);
2967 ret = __transport_check_aborted_status(cmd, send_status);
2968 spin_unlock_irq(&cmd->t_state_lock);
2969
2970 return ret;
2971}
c66ac9db
NB		 2972EXPORT_SYMBOL(transport_check_aborted_status);
2973
2974void transport_send_task_abort(struct se_cmd *cmd)
2975{
c252f003
NB		 2976 unsigned long flags;
2977
2978 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2979 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2980 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2981 return;
2982 }
2983 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2984
c66ac9db
NB		 2985 /*
2986 * If there are still expected incoming fabric WRITEs, we wait
2987 * until until they have completed before sending a TASK_ABORTED
2988 * response. This response with TASK_ABORTED status will be
2989 * queued back to fabric module by transport_check_aborted_status().
2990 */
2991 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2992 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
b9d99202
NB		 2993 spin_lock_irqsave(&cmd->t_state_lock, flags);
2994 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
2995 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2996 goto send_abort;
2997 }
68259b5a 2998 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
b9d99202 2999 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 3000 return;
c66ac9db
NB		 3001 }
3002 }
b9d99202 3003send_abort:
c66ac9db 3004 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3005
72b59d6e
RD		 3006 transport_lun_remove_cmd(cmd);
3007
649ee054
BVA		 3008 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3009 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3010
e5c0d6ad 3011 trace_target_cmd_complete(cmd);
e3d6f909 3012 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3013}
3014
af877292 3015static void target_tmr_work(struct work_struct *work)
c66ac9db 3016{
af877292 3017 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3018 struct se_device *dev = cmd->se_dev;
c66ac9db 3019 struct se_tmr_req *tmr = cmd->se_tmr_req;
91583a21 3020 unsigned long flags;
c66ac9db
NB		 3021 int ret;
3022
91583a21
NB		 3023 spin_lock_irqsave(&cmd->t_state_lock, flags);
3024 if (cmd->transport_state & CMD_T_ABORTED) {
3025 tmr->response = TMR_FUNCTION_REJECTED;
3026 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3027 goto check_stop;
3028 }
3029 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3030
c66ac9db 3031 switch (tmr->function) {
5c6cd613 3032 case TMR_ABORT_TASK:
3d28934a 3033 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3034 break;
5c6cd613
NB		 3035 case TMR_ABORT_TASK_SET:
3036 case TMR_CLEAR_ACA:
3037 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3038 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3039 break;
5c6cd613 3040 case TMR_LUN_RESET:
c66ac9db
NB		 3041 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3042 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3043 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3044 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3045 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3046 cmd->orig_fe_lun, 0x29,
3047 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3048 }
c66ac9db 3049 break;
5c6cd613 3050 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3051 tmr->response = TMR_FUNCTION_REJECTED;
3052 break;
5c6cd613 3053 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3054 tmr->response = TMR_FUNCTION_REJECTED;
3055 break;
c66ac9db 3056 default:
6708bb27 3057 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3058 tmr->function);
3059 tmr->response = TMR_FUNCTION_REJECTED;
3060 break;
3061 }
3062
91583a21
NB		 3063 spin_lock_irqsave(&cmd->t_state_lock, flags);
3064 if (cmd->transport_state & CMD_T_ABORTED) {
3065 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3066 goto check_stop;
3067 }
91583a21
NB		 3068 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3069
e3d6f909 3070 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3071
91583a21 3072check_stop:
b7b8bef7 3073 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3074}
3075
af877292
CH		 3076int transport_generic_handle_tmr(
3077 struct se_cmd *cmd)
c66ac9db 3078{
f15e9cd9 3079 unsigned long flags;
0c863acc 3080 bool aborted = false;
f15e9cd9
NB		 3081
3082 spin_lock_irqsave(&cmd->t_state_lock, flags);
0c863acc
NB		 3083 if (cmd->transport_state & CMD_T_ABORTED) {
3084 aborted = true;
3085 } else {
3086 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3087 cmd->transport_state |= CMD_T_ACTIVE;
3088 }
f15e9cd9
NB		 3089 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3090
0c863acc
NB		 3091 if (aborted) {
3092 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
3093 "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
3094 cmd->se_tmr_req->ref_task_tag, cmd->tag);
3095 transport_cmd_check_stop_to_fabric(cmd);
3096 return 0;
3097 }
3098
af877292
CH		 3099 INIT_WORK(&cmd->work, target_tmr_work);
3100 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3101 return 0;
3102}
af877292 3103EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3104
3105bool
3106target_check_wce(struct se_device *dev)
3107{
3108 bool wce = false;
3109
3110 if (dev->transport->get_write_cache)
3111 wce = dev->transport->get_write_cache(dev);
3112 else if (dev->dev_attrib.emulate_write_cache > 0)
3113 wce = true;
3114
3115 return wce;
3116}
3117
3118bool
3119target_check_fua(struct se_device *dev)
3120{
3121 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3122}