projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
target: Simplify LUN shutdown code
[linux-2.6-block.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
c66ac9db
NB		 37#include <asm/unaligned.h>
38#include <net/sock.h>
39#include <net/tcp.h>
40#include <scsi/scsi.h>
41#include <scsi/scsi_cmnd.h>
e66ecd50 42#include <scsi/scsi_tcq.h>
c66ac9db
NB		 43
44#include <target/target_core_base.h>
c4795fb2
CH		 45#include <target/target_core_backend.h>
46#include <target/target_core_fabric.h>
c66ac9db 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;
63struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
229d4f11
HR		 64struct kmem_cache *t10_alua_lba_map_cache;
65struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 66
c66ac9db 67static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 68static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 69 struct se_device *dev);
d5ddad41 70static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 71static void target_complete_ok_work(struct work_struct *work);
c66ac9db 72
e3d6f909 73int init_se_kmem_caches(void)
c66ac9db 74{
c66ac9db
NB		 75 se_sess_cache = kmem_cache_create("se_sess_cache",
76 sizeof(struct se_session), __alignof__(struct se_session),
77 0, NULL);
6708bb27
AG		 78 if (!se_sess_cache) {
79 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 80 " failed\n");
c8e31f26 81 goto out;
c66ac9db
NB		 82 }
83 se_ua_cache = kmem_cache_create("se_ua_cache",
84 sizeof(struct se_ua), __alignof__(struct se_ua),
85 0, NULL);
6708bb27
AG		 86 if (!se_ua_cache) {
87 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 88 goto out_free_sess_cache;
c66ac9db 89 }
c66ac9db
NB		 90 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
91 sizeof(struct t10_pr_registration),
92 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 93 if (!t10_pr_reg_cache) {
94 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 95 " failed\n");
35e0e757 96 goto out_free_ua_cache;
c66ac9db
NB		 97 }
98 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
99 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
100 0, NULL);
6708bb27
AG		 101 if (!t10_alua_lu_gp_cache) {
102 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 103 " failed\n");
35e0e757 104 goto out_free_pr_reg_cache;
c66ac9db
NB		 105 }
106 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
107 sizeof(struct t10_alua_lu_gp_member),
108 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 109 if (!t10_alua_lu_gp_mem_cache) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 111 "cache failed\n");
35e0e757 112 goto out_free_lu_gp_cache;
c66ac9db
NB		 113 }
114 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
115 sizeof(struct t10_alua_tg_pt_gp),
116 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 117 if (!t10_alua_tg_pt_gp_cache) {
118 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 119 "cache failed\n");
35e0e757 120 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 121 }
122 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
123 "t10_alua_tg_pt_gp_mem_cache",
124 sizeof(struct t10_alua_tg_pt_gp_member),
125 __alignof__(struct t10_alua_tg_pt_gp_member),
126 0, NULL);
6708bb27
AG		 127 if (!t10_alua_tg_pt_gp_mem_cache) {
128 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 129 "mem_t failed\n");
35e0e757 130 goto out_free_tg_pt_gp_cache;
c66ac9db 131 }
229d4f11
HR		 132 t10_alua_lba_map_cache = kmem_cache_create(
133 "t10_alua_lba_map_cache",
134 sizeof(struct t10_alua_lba_map),
135 __alignof__(struct t10_alua_lba_map), 0, NULL);
136 if (!t10_alua_lba_map_cache) {
137 pr_err("kmem_cache_create() for t10_alua_lba_map_"
138 "cache failed\n");
139 goto out_free_tg_pt_gp_mem_cache;
140 }
141 t10_alua_lba_map_mem_cache = kmem_cache_create(
142 "t10_alua_lba_map_mem_cache",
143 sizeof(struct t10_alua_lba_map_member),
144 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
145 if (!t10_alua_lba_map_mem_cache) {
146 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
147 "cache failed\n");
148 goto out_free_lba_map_cache;
149 }
c66ac9db 150
35e0e757
CH		 151 target_completion_wq = alloc_workqueue("target_completion",
152 WQ_MEM_RECLAIM, 0);
153 if (!target_completion_wq)
229d4f11 154 goto out_free_lba_map_mem_cache;
35e0e757 155
c66ac9db 156 return 0;
35e0e757 157
229d4f11
HR		 158out_free_lba_map_mem_cache:
159 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
160out_free_lba_map_cache:
161 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 162out_free_tg_pt_gp_mem_cache:
163 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
164out_free_tg_pt_gp_cache:
165 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
166out_free_lu_gp_mem_cache:
167 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
168out_free_lu_gp_cache:
169 kmem_cache_destroy(t10_alua_lu_gp_cache);
170out_free_pr_reg_cache:
171 kmem_cache_destroy(t10_pr_reg_cache);
172out_free_ua_cache:
173 kmem_cache_destroy(se_ua_cache);
174out_free_sess_cache:
175 kmem_cache_destroy(se_sess_cache);
c66ac9db 176out:
e3d6f909 177 return -ENOMEM;
c66ac9db
NB		 178}
179
e3d6f909 180void release_se_kmem_caches(void)
c66ac9db 181{
35e0e757 182 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 183 kmem_cache_destroy(se_sess_cache);
184 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 185 kmem_cache_destroy(t10_pr_reg_cache);
186 kmem_cache_destroy(t10_alua_lu_gp_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
188 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
229d4f11
HR		 190 kmem_cache_destroy(t10_alua_lba_map_cache);
191 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 192}
193
e3d6f909
AG		 194/* This code ensures unique mib indexes are handed out. */
195static DEFINE_SPINLOCK(scsi_mib_index_lock);
196static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 197
198/*
199 * Allocate a new row index for the entry type specified
200 */
201u32 scsi_get_new_index(scsi_index_t type)
202{
203 u32 new_index;
204
e3d6f909 205 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 206
e3d6f909
AG		 207 spin_lock(&scsi_mib_index_lock);
208 new_index = ++scsi_mib_index[type];
209 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 210
211 return new_index;
212}
213
dbc5623e 214void transport_subsystem_check_init(void)
c66ac9db
NB		 215{
216 int ret;
283669d2 217 static int sub_api_initialized;
c66ac9db 218
dbc5623e
NB		 219 if (sub_api_initialized)
220 return;
221
c66ac9db
NB		 222 ret = request_module("target_core_iblock");
223 if (ret != 0)
6708bb27 224 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 225
226 ret = request_module("target_core_file");
227 if (ret != 0)
6708bb27 228 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 229
230 ret = request_module("target_core_pscsi");
231 if (ret != 0)
6708bb27 232 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 233
7c9e7a6f
AG		 234 ret = request_module("target_core_user");
235 if (ret != 0)
236 pr_err("Unable to load target_core_user\n");
237
e3d6f909 238 sub_api_initialized = 1;
c66ac9db
NB		 239}
240
e70beee7 241struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 242{
243 struct se_session *se_sess;
244
245 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 246 if (!se_sess) {
247 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 248 " se_sess_cache\n");
249 return ERR_PTR(-ENOMEM);
250 }
251 INIT_LIST_HEAD(&se_sess->sess_list);
252 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 253 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 254 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 255 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 256 kref_init(&se_sess->sess_kref);
e70beee7 257 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 258
259 return se_sess;
260}
261EXPORT_SYMBOL(transport_init_session);
262
c0add7fd
NB		 263int transport_alloc_session_tags(struct se_session *se_sess,
264 unsigned int tag_num, unsigned int tag_size)
265{
266 int rc;
267
8c7f6e9b
NB		 268 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
269 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 270 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 271 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
272 if (!se_sess->sess_cmd_map) {
273 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
274 return -ENOMEM;
275 }
c0add7fd
NB		 276 }
277
278 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
279 if (rc < 0) {
280 pr_err("Unable to init se_sess->sess_tag_pool,"
281 " tag_num: %u\n", tag_num);
8c7f6e9b
NB		 282 if (is_vmalloc_addr(se_sess->sess_cmd_map))
283 vfree(se_sess->sess_cmd_map);
284 else
285 kfree(se_sess->sess_cmd_map);
c0add7fd
NB		 286 se_sess->sess_cmd_map = NULL;
287 return -ENOMEM;
288 }
289
290 return 0;
291}
292EXPORT_SYMBOL(transport_alloc_session_tags);
293
294struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 295 unsigned int tag_size,
296 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 297{
298 struct se_session *se_sess;
299 int rc;
300
e70beee7 301 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 302 if (IS_ERR(se_sess))
303 return se_sess;
304
305 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
306 if (rc < 0) {
307 transport_free_session(se_sess);
308 return ERR_PTR(-ENOMEM);
309 }
310
311 return se_sess;
312}
313EXPORT_SYMBOL(transport_init_session_tags);
314
c66ac9db 315/*
140854cb 316 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 317 */
318void __transport_register_session(
319 struct se_portal_group *se_tpg,
320 struct se_node_acl *se_nacl,
321 struct se_session *se_sess,
322 void *fabric_sess_ptr)
323{
9ac8928e 324 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 325 unsigned char buf[PR_REG_ISID_LEN];
326
327 se_sess->se_tpg = se_tpg;
328 se_sess->fabric_sess_ptr = fabric_sess_ptr;
329 /*
330 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
331 *
332 * Only set for struct se_session's that will actually be moving I/O.
333 * eg: *NOT* discovery sessions.
334 */
335 if (se_nacl) {
bffb5128
NB		 336 /*
337 *
338 * Determine if fabric allows for T10-PI feature bits exposed to
339 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
340 *
341 * If so, then always save prot_type on a per se_node_acl node
342 * basis and re-instate the previous sess_prot_type to avoid
343 * disabling PI from below any previously initiator side
344 * registered LUNs.
345 */
346 if (se_nacl->saved_prot_type)
347 se_sess->sess_prot_type = se_nacl->saved_prot_type;
348 else if (tfo->tpg_check_prot_fabric_only)
349 se_sess->sess_prot_type = se_nacl->saved_prot_type =
350 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 351 /*
352 * If the fabric module supports an ISID based TransportID,
353 * save this value in binary from the fabric I_T Nexus now.
354 */
e3d6f909 355 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 356 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 357 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 358 &buf[0], PR_REG_ISID_LEN);
359 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
360 }
afb999ff
NB		 361 kref_get(&se_nacl->acl_kref);
362
c66ac9db
NB		 363 spin_lock_irq(&se_nacl->nacl_sess_lock);
364 /*
365 * The se_nacl->nacl_sess pointer will be set to the
366 * last active I_T Nexus for each struct se_node_acl.
367 */
368 se_nacl->nacl_sess = se_sess;
369
370 list_add_tail(&se_sess->sess_acl_list,
371 &se_nacl->acl_sess_list);
372 spin_unlock_irq(&se_nacl->nacl_sess_lock);
373 }
374 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
375
6708bb27 376 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 377 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 378}
379EXPORT_SYMBOL(__transport_register_session);
380
381void transport_register_session(
382 struct se_portal_group *se_tpg,
383 struct se_node_acl *se_nacl,
384 struct se_session *se_sess,
385 void *fabric_sess_ptr)
386{
140854cb
NB		 387 unsigned long flags;
388
389 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 390 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 391 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 392}
393EXPORT_SYMBOL(transport_register_session);
394
ecf0dd66 395static void target_release_session(struct kref *kref)
41ac82b6
NB		 396{
397 struct se_session *se_sess = container_of(kref,
398 struct se_session, sess_kref);
399 struct se_portal_group *se_tpg = se_sess->se_tpg;
400
401 se_tpg->se_tpg_tfo->close_session(se_sess);
402}
403
404void target_get_session(struct se_session *se_sess)
405{
406 kref_get(&se_sess->sess_kref);
407}
408EXPORT_SYMBOL(target_get_session);
409
33933a0e 410void target_put_session(struct se_session *se_sess)
41ac82b6 411{
33933a0e 412 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 413}
414EXPORT_SYMBOL(target_put_session);
415
f8e471f9
NB		 416ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
417{
418 struct se_session *se_sess;
419 ssize_t len = 0;
420
421 spin_lock_bh(&se_tpg->session_lock);
422 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
423 if (!se_sess->se_node_acl)
424 continue;
425 if (!se_sess->se_node_acl->dynamic_node_acl)
426 continue;
427 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
428 break;
429
430 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
431 se_sess->se_node_acl->initiatorname);
432 len += 1; /* Include NULL terminator */
433 }
434 spin_unlock_bh(&se_tpg->session_lock);
435
436 return len;
437}
438EXPORT_SYMBOL(target_show_dynamic_sessions);
439
afb999ff
NB		 440static void target_complete_nacl(struct kref *kref)
441{
442 struct se_node_acl *nacl = container_of(kref,
443 struct se_node_acl, acl_kref);
444
445 complete(&nacl->acl_free_comp);
446}
447
448void target_put_nacl(struct se_node_acl *nacl)
449{
450 kref_put(&nacl->acl_kref, target_complete_nacl);
451}
452
c66ac9db
NB		 453void transport_deregister_session_configfs(struct se_session *se_sess)
454{
455 struct se_node_acl *se_nacl;
23388864 456 unsigned long flags;
c66ac9db
NB		 457 /*
458 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
459 */
460 se_nacl = se_sess->se_node_acl;
6708bb27 461 if (se_nacl) {
23388864 462 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 463 if (se_nacl->acl_stop == 0)
464 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 465 /*
466 * If the session list is empty, then clear the pointer.
467 * Otherwise, set the struct se_session pointer from the tail
468 * element of the per struct se_node_acl active session list.
469 */
470 if (list_empty(&se_nacl->acl_sess_list))
471 se_nacl->nacl_sess = NULL;
472 else {
473 se_nacl->nacl_sess = container_of(
474 se_nacl->acl_sess_list.prev,
475 struct se_session, sess_acl_list);
476 }
23388864 477 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 478 }
479}
480EXPORT_SYMBOL(transport_deregister_session_configfs);
481
482void transport_free_session(struct se_session *se_sess)
483{
c0add7fd
NB		 484 if (se_sess->sess_cmd_map) {
485 percpu_ida_destroy(&se_sess->sess_tag_pool);
8c7f6e9b
NB		 486 if (is_vmalloc_addr(se_sess->sess_cmd_map))
487 vfree(se_sess->sess_cmd_map);
488 else
489 kfree(se_sess->sess_cmd_map);
c0add7fd 490 }
c66ac9db
NB		 491 kmem_cache_free(se_sess_cache, se_sess);
492}
493EXPORT_SYMBOL(transport_free_session);
494
495void transport_deregister_session(struct se_session *se_sess)
496{
497 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 498 const struct target_core_fabric_ops *se_tfo;
c66ac9db 499 struct se_node_acl *se_nacl;
e63a8e19 500 unsigned long flags;
403edd78 501 bool comp_nacl = true, drop_nacl = false;
c66ac9db 502
6708bb27 503 if (!se_tpg) {
c66ac9db
NB		 504 transport_free_session(se_sess);
505 return;
506 }
01468346 507 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 508
e63a8e19 509 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 510 list_del(&se_sess->sess_list);
511 se_sess->se_tpg = NULL;
512 se_sess->fabric_sess_ptr = NULL;
e63a8e19 513 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 514
515 /*
516 * Determine if we need to do extra work for this initiator node's
517 * struct se_node_acl if it had been previously dynamically generated.
518 */
519 se_nacl = se_sess->se_node_acl;
01468346 520
403edd78 521 mutex_lock(&se_tpg->acl_node_mutex);
01468346
NB		 522 if (se_nacl && se_nacl->dynamic_node_acl) {
523 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
524 list_del(&se_nacl->acl_list);
525 se_tpg->num_node_acls--;
403edd78 526 drop_nacl = true;
c66ac9db 527 }
c66ac9db 528 }
403edd78 529 mutex_unlock(&se_tpg->acl_node_mutex);
c66ac9db 530
403edd78
NB		 531 if (drop_nacl) {
532 core_tpg_wait_for_nacl_pr_ref(se_nacl);
533 core_free_device_list_for_node(se_nacl, se_tpg);
534 kfree(se_nacl);
535 comp_nacl = false;
536 }
6708bb27 537 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 538 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 539 /*
125d0119 540 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 541 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
542 * removal context.
01468346 543 */
0bcc297e 544 if (se_nacl && comp_nacl)
afb999ff 545 target_put_nacl(se_nacl);
01468346 546
afb999ff 547 transport_free_session(se_sess);
c66ac9db
NB		 548}
549EXPORT_SYMBOL(transport_deregister_session);
550
551/*
a1d8b49a 552 * Called with cmd->t_state_lock held.
c66ac9db 553 */
cf572a96 554static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 555{
42bf829e 556 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 557 unsigned long flags;
558
42bf829e
CH		 559 if (!dev)
560 return;
c66ac9db 561
cf572a96
CH		 562 if (cmd->transport_state & CMD_T_BUSY)
563 return;
c66ac9db 564
cf572a96
CH		 565 spin_lock_irqsave(&dev->execute_task_lock, flags);
566 if (cmd->state_active) {
567 list_del(&cmd->state_list);
cf572a96 568 cmd->state_active = false;
c66ac9db 569 }
cf572a96 570 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 571}
572
862e6389
NB		 573static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
574 bool write_pending)
c66ac9db
NB		 575{
576 unsigned long flags;
577
a1d8b49a 578 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 579 if (write_pending)
580 cmd->t_state = TRANSPORT_WRITE_PENDING;
581
f7113a47
CH		 582 if (remove_from_lists) {
583 target_remove_from_state_list(cmd);
584
585 /*
586 * Clear struct se_cmd->se_lun before the handoff to FE.
587 */
588 cmd->se_lun = NULL;
589 }
590
c66ac9db
NB		 591 /*
592 * Determine if frontend context caller is requesting the stopping of
e3d6f909 593 * this command for frontend exceptions.
c66ac9db 594 */
7d680f3b 595 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 596 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
597 __func__, __LINE__, cmd->tag);
c66ac9db 598
a1d8b49a 599 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 600
a95d6511 601 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 602 return 1;
603 }
f7113a47
CH		 604
605 cmd->transport_state &= ~CMD_T_ACTIVE;
606 if (remove_from_lists) {
607 /*
608 * Some fabric modules like tcm_loop can release
609 * their internally allocated I/O reference now and
610 * struct se_cmd now.
611 *
612 * Fabric modules are expected to return '1' here if the
613 * se_cmd being passed is released at this point,
614 * or zero if not being released.
615 */
616 if (cmd->se_tfo->check_stop_free != NULL) {
617 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
618 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 619 }
f7113a47 620 }
c66ac9db 621
a1d8b49a 622 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 623 return 0;
624}
625
626static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
627{
862e6389 628 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 629}
630
631static void transport_lun_remove_cmd(struct se_cmd *cmd)
632{
e3d6f909 633 struct se_lun *lun = cmd->se_lun;
c66ac9db 634
5259a06e 635 if (!lun)
c66ac9db
NB		 636 return;
637
5259a06e
NB		 638 if (cmpxchg(&cmd->lun_ref_active, true, false))
639 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 640}
641
642void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
643{
68259b5a
AL		 644 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
645 transport_lun_remove_cmd(cmd);
131e6abc
NB		 646 /*
647 * Allow the fabric driver to unmap any resources before
648 * releasing the descriptor via TFO->release_cmd()
649 */
650 if (remove)
651 cmd->se_tfo->aborted_task(cmd);
68259b5a 652
c66ac9db
NB		 653 if (transport_cmd_check_stop_to_fabric(cmd))
654 return;
af877292 655 if (remove)
e6a2573f 656 transport_put_cmd(cmd);
c66ac9db
NB		 657}
658
35e0e757
CH		 659static void target_complete_failure_work(struct work_struct *work)
660{
661 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
662
de103c93
CH		 663 transport_generic_request_failure(cmd,
664 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 665}
666
6138ed2a 667/*
d5829eac
PB		 668 * Used when asking transport to copy Sense Data from the underlying
669 * Linux/SCSI struct scsi_cmnd
6138ed2a 670 */
d5829eac 671static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 672{
6138ed2a 673 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 674
675 WARN_ON(!cmd->se_lun);
676
677 if (!dev)
d5829eac 678 return NULL;
6138ed2a 679
d5829eac
PB		 680 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
681 return NULL;
6138ed2a 682
9c58b7dd 683 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 684
d5829eac 685 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 686 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 687 return cmd->sense_buffer;
6138ed2a
PB		 688}
689
5787cacd 690void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 691{
42bf829e 692 struct se_device *dev = cmd->se_dev;
5787cacd 693 int success = scsi_status == GOOD;
c66ac9db 694 unsigned long flags;
c66ac9db 695
5787cacd
CH		 696 cmd->scsi_status = scsi_status;
697
698
a1d8b49a 699 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 700 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 701
c66ac9db 702 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 703 dev->transport->transport_complete(cmd,
704 cmd->t_data_sg,
705 transport_get_sense_buffer(cmd));
706 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 707 success = 1;
c66ac9db
NB		 708 }
709
710 /*
5787cacd 711 * See if we are waiting to complete for an exception condition.
c66ac9db 712 */
cf572a96 713 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 715 complete(&cmd->task_stop_comp);
c66ac9db
NB		 716 return;
717 }
2235007c 718
3d28934a 719 /*
125d0119 720 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 721 * and transport_wait_for_tasks() will be waiting for completion..
722 */
723 if (cmd->transport_state & CMD_T_ABORTED &&
724 cmd->transport_state & CMD_T_STOP) {
725 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 726 complete_all(&cmd->t_transport_stop_comp);
3d28934a 727 return;
3dca1471 728 } else if (!success) {
35e0e757 729 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 730 } else {
35e0e757 731 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 732 }
35e0e757 733
35e0e757 734 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 735 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 736 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 737
35e0e757 738 queue_work(target_completion_wq, &cmd->work);
c66ac9db 739}
6bb35e00
CH		 740EXPORT_SYMBOL(target_complete_cmd);
741
2426bd45
RD		 742void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
743{
744 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
745 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
746 cmd->residual_count += cmd->data_length - length;
747 } else {
748 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
749 cmd->residual_count = cmd->data_length - length;
750 }
751
752 cmd->data_length = length;
753 }
754
755 target_complete_cmd(cmd, scsi_status);
756}
757EXPORT_SYMBOL(target_complete_cmd_with_length);
758
cf572a96 759static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 760{
cf572a96
CH		 761 struct se_device *dev = cmd->se_dev;
762 unsigned long flags;
c66ac9db 763
cf572a96
CH		 764 spin_lock_irqsave(&dev->execute_task_lock, flags);
765 if (!cmd->state_active) {
766 list_add_tail(&cmd->state_list, &dev->state_list);
767 cmd->state_active = true;
c66ac9db 768 }
cf572a96 769 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 770}
771
07bde79a 772/*
f147abb4 773 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 774 */
7a6f0a1e
CH		 775static void transport_write_pending_qf(struct se_cmd *cmd);
776static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 777
0fd97ccf 778void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 779{
780 struct se_device *dev = container_of(work, struct se_device,
781 qf_work_queue);
bcac364a 782 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 783 struct se_cmd *cmd, *cmd_tmp;
784
785 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 786 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
787 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 788
bcac364a 789 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 790 list_del(&cmd->se_qf_node);
33940d09 791 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 792
6708bb27 793 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 794 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 795 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 796 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
797 : "UNKNOWN");
f7a5cc0b 798
7a6f0a1e
CH		 799 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
800 transport_write_pending_qf(cmd);
801 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
802 transport_complete_qf(cmd);
07bde79a 803 }
07bde79a
NB		 804}
805
c66ac9db
NB		 806unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
807{
808 switch (cmd->data_direction) {
809 case DMA_NONE:
810 return "NONE";
811 case DMA_FROM_DEVICE:
812 return "READ";
813 case DMA_TO_DEVICE:
814 return "WRITE";
815 case DMA_BIDIRECTIONAL:
816 return "BIDI";
817 default:
818 break;
819 }
820
821 return "UNKNOWN";
822}
823
824void transport_dump_dev_state(
825 struct se_device *dev,
826 char *b,
827 int *bl)
828{
829 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 830 if (dev->export_count)
c66ac9db 831 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 832 else
c66ac9db 833 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 834
5f41a31d 835 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 836 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 837 dev->dev_attrib.block_size,
838 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 839 *bl += sprintf(b + *bl, " ");
840}
841
c66ac9db
NB		 842void transport_dump_vpd_proto_id(
843 struct t10_vpd *vpd,
844 unsigned char *p_buf,
845 int p_buf_len)
846{
847 unsigned char buf[VPD_TMP_BUF_SIZE];
848 int len;
849
850 memset(buf, 0, VPD_TMP_BUF_SIZE);
851 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
852
853 switch (vpd->protocol_identifier) {
854 case 0x00:
855 sprintf(buf+len, "Fibre Channel\n");
856 break;
857 case 0x10:
858 sprintf(buf+len, "Parallel SCSI\n");
859 break;
860 case 0x20:
861 sprintf(buf+len, "SSA\n");
862 break;
863 case 0x30:
864 sprintf(buf+len, "IEEE 1394\n");
865 break;
866 case 0x40:
867 sprintf(buf+len, "SCSI Remote Direct Memory Access"
868 " Protocol\n");
869 break;
870 case 0x50:
871 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
872 break;
873 case 0x60:
874 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
875 break;
876 case 0x70:
877 sprintf(buf+len, "Automation/Drive Interface Transport"
878 " Protocol\n");
879 break;
880 case 0x80:
881 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
882 break;
883 default:
884 sprintf(buf+len, "Unknown 0x%02x\n",
885 vpd->protocol_identifier);
886 break;
887 }
888
889 if (p_buf)
890 strncpy(p_buf, buf, p_buf_len);
891 else
6708bb27 892 pr_debug("%s", buf);
c66ac9db
NB		 893}
894
895void
896transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
897{
898 /*
899 * Check if the Protocol Identifier Valid (PIV) bit is set..
900 *
901 * from spc3r23.pdf section 7.5.1
902 */
903 if (page_83[1] & 0x80) {
904 vpd->protocol_identifier = (page_83[0] & 0xf0);
905 vpd->protocol_identifier_set = 1;
906 transport_dump_vpd_proto_id(vpd, NULL, 0);
907 }
908}
909EXPORT_SYMBOL(transport_set_vpd_proto_id);
910
911int transport_dump_vpd_assoc(
912 struct t10_vpd *vpd,
913 unsigned char *p_buf,
914 int p_buf_len)
915{
916 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 917 int ret = 0;
918 int len;
c66ac9db
NB		 919
920 memset(buf, 0, VPD_TMP_BUF_SIZE);
921 len = sprintf(buf, "T10 VPD Identifier Association: ");
922
923 switch (vpd->association) {
924 case 0x00:
925 sprintf(buf+len, "addressed logical unit\n");
926 break;
927 case 0x10:
928 sprintf(buf+len, "target port\n");
929 break;
930 case 0x20:
931 sprintf(buf+len, "SCSI target device\n");
932 break;
933 default:
934 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 935 ret = -EINVAL;
c66ac9db
NB		 936 break;
937 }
938
939 if (p_buf)
940 strncpy(p_buf, buf, p_buf_len);
941 else
6708bb27 942 pr_debug("%s", buf);
c66ac9db
NB		 943
944 return ret;
945}
946
947int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
948{
949 /*
950 * The VPD identification association..
951 *
952 * from spc3r23.pdf Section 7.6.3.1 Table 297
953 */
954 vpd->association = (page_83[1] & 0x30);
955 return transport_dump_vpd_assoc(vpd, NULL, 0);
956}
957EXPORT_SYMBOL(transport_set_vpd_assoc);
958
959int transport_dump_vpd_ident_type(
960 struct t10_vpd *vpd,
961 unsigned char *p_buf,
962 int p_buf_len)
963{
964 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 965 int ret = 0;
966 int len;
c66ac9db
NB		 967
968 memset(buf, 0, VPD_TMP_BUF_SIZE);
969 len = sprintf(buf, "T10 VPD Identifier Type: ");
970
971 switch (vpd->device_identifier_type) {
972 case 0x00:
973 sprintf(buf+len, "Vendor specific\n");
974 break;
975 case 0x01:
976 sprintf(buf+len, "T10 Vendor ID based\n");
977 break;
978 case 0x02:
979 sprintf(buf+len, "EUI-64 based\n");
980 break;
981 case 0x03:
982 sprintf(buf+len, "NAA\n");
983 break;
984 case 0x04:
985 sprintf(buf+len, "Relative target port identifier\n");
986 break;
987 case 0x08:
988 sprintf(buf+len, "SCSI name string\n");
989 break;
990 default:
991 sprintf(buf+len, "Unsupported: 0x%02x\n",
992 vpd->device_identifier_type);
e3d6f909 993 ret = -EINVAL;
c66ac9db
NB		 994 break;
995 }
996
e3d6f909
AG		 997 if (p_buf) {
998 if (p_buf_len < strlen(buf)+1)
999 return -EINVAL;
c66ac9db 1000 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1001 } else {
6708bb27 1002 pr_debug("%s", buf);
e3d6f909 1003 }
c66ac9db
NB		 1004
1005 return ret;
1006}
1007
1008int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1009{
1010 /*
1011 * The VPD identifier type..
1012 *
1013 * from spc3r23.pdf Section 7.6.3.1 Table 298
1014 */
1015 vpd->device_identifier_type = (page_83[1] & 0x0f);
1016 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1017}
1018EXPORT_SYMBOL(transport_set_vpd_ident_type);
1019
1020int transport_dump_vpd_ident(
1021 struct t10_vpd *vpd,
1022 unsigned char *p_buf,
1023 int p_buf_len)
1024{
1025 unsigned char buf[VPD_TMP_BUF_SIZE];
1026 int ret = 0;
1027
1028 memset(buf, 0, VPD_TMP_BUF_SIZE);
1029
1030 switch (vpd->device_identifier_code_set) {
1031 case 0x01: /* Binary */
703d641d
DC		 1032 snprintf(buf, sizeof(buf),
1033 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1034 &vpd->device_identifier[0]);
1035 break;
1036 case 0x02: /* ASCII */
703d641d
DC		 1037 snprintf(buf, sizeof(buf),
1038 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1039 &vpd->device_identifier[0]);
1040 break;
1041 case 0x03: /* UTF-8 */
703d641d
DC		 1042 snprintf(buf, sizeof(buf),
1043 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1044 &vpd->device_identifier[0]);
1045 break;
1046 default:
1047 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1048 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1049 ret = -EINVAL;
c66ac9db
NB		 1050 break;
1051 }
1052
1053 if (p_buf)
1054 strncpy(p_buf, buf, p_buf_len);
1055 else
6708bb27 1056 pr_debug("%s", buf);
c66ac9db
NB		 1057
1058 return ret;
1059}
1060
1061int
1062transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1063{
1064 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1065 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1066
1067 /*
1068 * The VPD Code Set (encoding)
1069 *
1070 * from spc3r23.pdf Section 7.6.3.1 Table 296
1071 */
1072 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1073 switch (vpd->device_identifier_code_set) {
1074 case 0x01: /* Binary */
1075 vpd->device_identifier[j++] =
1076 hex_str[vpd->device_identifier_type];
1077 while (i < (4 + page_83[3])) {
1078 vpd->device_identifier[j++] =
1079 hex_str[(page_83[i] & 0xf0) >> 4];
1080 vpd->device_identifier[j++] =
1081 hex_str[page_83[i] & 0x0f];
1082 i++;
1083 }
1084 break;
1085 case 0x02: /* ASCII */
1086 case 0x03: /* UTF-8 */
1087 while (i < (4 + page_83[3]))
1088 vpd->device_identifier[j++] = page_83[i++];
1089 break;
1090 default:
1091 break;
1092 }
1093
1094 return transport_dump_vpd_ident(vpd, NULL, 0);
1095}
1096EXPORT_SYMBOL(transport_set_vpd_ident);
1097
de103c93
CH		 1098sense_reason_t
1099target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1100{
1101 struct se_device *dev = cmd->se_dev;
1102
1103 if (cmd->unknown_data_length) {
1104 cmd->data_length = size;
1105 } else if (size != cmd->data_length) {
1106 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1107 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1108 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1109 cmd->data_length, size, cmd->t_task_cdb[0]);
1110
9b3b8041
CH		 1111 if (cmd->data_direction == DMA_TO_DEVICE) {
1112 pr_err("Rejecting underflow/overflow"
1113 " WRITE data\n");
de103c93 1114 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1115 }
1116 /*
1117 * Reject READ_* or WRITE_* with overflow/underflow for
1118 * type SCF_SCSI_DATA_CDB.
1119 */
0fd97ccf 1120 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1121 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1122 " CDB on non 512-byte sector setup subsystem"
1123 " plugin: %s\n", dev->transport->name);
1124 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1125 return TCM_INVALID_CDB_FIELD;
9b3b8041 1126 }
4c054ba6
NB		 1127 /*
1128 * For the overflow case keep the existing fabric provided
1129 * ->data_length. Otherwise for the underflow case, reset
1130 * ->data_length to the smaller SCSI expected data transfer
1131 * length.
1132 */
9b3b8041
CH		 1133 if (size > cmd->data_length) {
1134 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1135 cmd->residual_count = (size - cmd->data_length);
1136 } else {
1137 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1138 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1139 cmd->data_length = size;
9b3b8041 1140 }
9b3b8041
CH		 1141 }
1142
1143 return 0;
1144
9b3b8041
CH		 1145}
1146
c66ac9db
NB		 1147/*
1148 * Used by fabric modules containing a local struct se_cmd within their
1149 * fabric dependent per I/O descriptor.
649ee054
BVA		 1150 *
1151 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1152 */
1153void transport_init_se_cmd(
1154 struct se_cmd *cmd,
9ac8928e 1155 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1156 struct se_session *se_sess,
1157 u32 data_length,
1158 int data_direction,
1159 int task_attr,
1160 unsigned char *sense_buffer)
1161{
5951146d 1162 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1163 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1164 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1165 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1166 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1167 init_completion(&cmd->cmd_wait_comp);
cf572a96 1168 init_completion(&cmd->task_stop_comp);
a1d8b49a 1169 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1170 kref_init(&cmd->cmd_kref);
7d680f3b 1171 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1172
1173 cmd->se_tfo = tfo;
1174 cmd->se_sess = se_sess;
1175 cmd->data_length = data_length;
1176 cmd->data_direction = data_direction;
1177 cmd->sam_task_attr = task_attr;
1178 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1179
1180 cmd->state_active = false;
c66ac9db
NB		 1181}
1182EXPORT_SYMBOL(transport_init_se_cmd);
1183
de103c93
CH		 1184static sense_reason_t
1185transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1186{
019c4ca6
CH		 1187 struct se_device *dev = cmd->se_dev;
1188
c66ac9db
NB		 1189 /*
1190 * Check if SAM Task Attribute emulation is enabled for this
1191 * struct se_device storage object
1192 */
a3541703 1193 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1194 return 0;
1195
68d81f40 1196 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1197 pr_debug("SAM Task Attribute ACA"
c66ac9db 1198 " emulation is not supported\n");
de103c93 1199 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1200 }
1201 /*
1202 * Used to determine when ORDERED commands should go from
1203 * Dormant to Active status.
1204 */
019c4ca6 1205 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
6708bb27 1206 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1207 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1208 dev->transport->name);
c66ac9db
NB		 1209 return 0;
1210}
1211
de103c93
CH		 1212sense_reason_t
1213target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1214{
0fd97ccf 1215 struct se_device *dev = cmd->se_dev;
de103c93 1216 sense_reason_t ret;
c66ac9db 1217
c66ac9db
NB		 1218 /*
1219 * Ensure that the received CDB is less than the max (252 + 8) bytes
1220 * for VARIABLE_LENGTH_CMD
1221 */
1222 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1223 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1224 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1225 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1226 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1227 }
1228 /*
1229 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1230 * allocate the additional extended CDB buffer now.. Otherwise
1231 * setup the pointer from __t_task_cdb to t_task_cdb.
1232 */
a1d8b49a
AG		 1233 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1234 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1235 GFP_KERNEL);
6708bb27
AG		 1236 if (!cmd->t_task_cdb) {
1237 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1238 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1239 scsi_command_size(cdb),
a1d8b49a 1240 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1241 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1242 }
1243 } else
a1d8b49a 1244 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1245 /*
a1d8b49a 1246 * Copy the original CDB into cmd->
c66ac9db 1247 */
a1d8b49a 1248 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1249
e5c0d6ad
RD		 1250 trace_target_sequencer_start(cmd);
1251
cb4f4d3c
CH		 1252 /*
1253 * Check for an existing UNIT ATTENTION condition
1254 */
de103c93
CH		 1255 ret = target_scsi3_ua_check(cmd);
1256 if (ret)
1257 return ret;
cb4f4d3c 1258
c87fbd56 1259 ret = target_alua_state_check(cmd);
de103c93
CH		 1260 if (ret)
1261 return ret;
cb4f4d3c 1262
d977f437 1263 ret = target_check_reservation(cmd);
f85eda8d
NB		 1264 if (ret) {
1265 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1266 return ret;
f85eda8d 1267 }
cb4f4d3c 1268
0fd97ccf 1269 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1270 if (ret)
1271 return ret;
1272
1273 ret = transport_check_alloc_task_attr(cmd);
1274 if (ret)
c66ac9db 1275 return ret;
cb4f4d3c 1276
cb4f4d3c 1277 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1278
c66ac9db
NB		 1279 spin_lock(&cmd->se_lun->lun_sep_lock);
1280 if (cmd->se_lun->lun_sep)
1281 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1282 spin_unlock(&cmd->se_lun->lun_sep_lock);
1283 return 0;
1284}
a12f41f8 1285EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1286
695434e1
NB		 1287/*
1288 * Used by fabric module frontends to queue tasks directly.
1289 * Many only be used from process context only
1290 */
1291int transport_handle_cdb_direct(
1292 struct se_cmd *cmd)
1293{
de103c93 1294 sense_reason_t ret;
dd8ae59d 1295
695434e1
NB		 1296 if (!cmd->se_lun) {
1297 dump_stack();
6708bb27 1298 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1299 return -EINVAL;
1300 }
1301 if (in_interrupt()) {
1302 dump_stack();
6708bb27 1303 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1304 " from interrupt context\n");
1305 return -EINVAL;
1306 }
dd8ae59d 1307 /*
af877292
CH		 1308 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1309 * outstanding descriptors are handled correctly during shutdown via
1310 * transport_wait_for_tasks()
dd8ae59d
NB		 1311 *
1312 * Also, we don't take cmd->t_state_lock here as we only expect
1313 * this to be called for initial descriptor submission.
1314 */
1315 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1316 cmd->transport_state |= CMD_T_ACTIVE;
1317
dd8ae59d
NB		 1318 /*
1319 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1320 * so follow TRANSPORT_NEW_CMD processing thread context usage
1321 * and call transport_generic_request_failure() if necessary..
1322 */
1323 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1324 if (ret)
1325 transport_generic_request_failure(cmd, ret);
dd8ae59d 1326 return 0;
695434e1
NB		 1327}
1328EXPORT_SYMBOL(transport_handle_cdb_direct);
1329
c5ff8d6b 1330sense_reason_t
de103c93
CH		 1331transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1332 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1333{
1334 if (!sgl || !sgl_count)
1335 return 0;
1336
1337 /*
1338 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1339 * scatterlists already have been set to follow what the fabric
1340 * passes for the original expected data transfer length.
1341 */
1342 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1343 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1344 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1345 return TCM_INVALID_CDB_FIELD;
1346 }
1347
1348 cmd->t_data_sg = sgl;
1349 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1350 cmd->t_bidi_data_sg = sgl_bidi;
1351 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1352
de103c93
CH		 1353 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1354 return 0;
1355}
1356
a026757f
NB		 1357/*
1358 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1359 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1360 *
1361 * @se_cmd: command descriptor to submit
1362 * @se_sess: associated se_sess for endpoint
1363 * @cdb: pointer to SCSI CDB
1364 * @sense: pointer to SCSI sense buffer
1365 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1366 * @data_length: fabric expected data transfer length
1367 * @task_addr: SAM task attribute
1368 * @data_dir: DMA data direction
1369 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1370 * @sgl: struct scatterlist memory for unidirectional mapping
1371 * @sgl_count: scatterlist count for unidirectional mapping
1372 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1373 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1374 * @sgl_prot: struct scatterlist memory protection information
1375 * @sgl_prot_count: scatterlist count for protection information
a6360785 1376 *
649ee054
BVA		 1377 * Task tags are supported if the caller has set @se_cmd->tag.
1378 *
d6dfc868
RD		 1379 * Returns non zero to signal active I/O shutdown failure. All other
1380 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1381 * but still return zero here.
1382 *
a6360785
NB		 1383 * This may only be called from process context, and also currently
1384 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1385 */
1386int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1387 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1388 u32 data_length, int task_attr, int data_dir, int flags,
1389 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1390 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1391 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1392{
1393 struct se_portal_group *se_tpg;
de103c93
CH		 1394 sense_reason_t rc;
1395 int ret;
a6360785
NB		 1396
1397 se_tpg = se_sess->se_tpg;
1398 BUG_ON(!se_tpg);
1399 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1400 BUG_ON(in_interrupt());
1401 /*
1402 * Initialize se_cmd for target operation. From this point
1403 * exceptions are handled by sending exception status via
1404 * target_core_fabric_ops->queue_status() callback
1405 */
1406 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1407 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1408 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1409 se_cmd->unknown_data_length = 1;
a6360785
NB		 1410 /*
1411 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1412 * se_sess->sess_cmd_list. A second kref_get here is necessary
1413 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1414 * kref_put() to happen during fabric packet acknowledgement.
1415 */
afc16604 1416 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1417 if (ret)
1418 return ret;
a6360785
NB		 1419 /*
1420 * Signal bidirectional data payloads to target-core
1421 */
1422 if (flags & TARGET_SCF_BIDI_OP)
1423 se_cmd->se_cmd_flags |= SCF_BIDI;
1424 /*
1425 * Locate se_lun pointer and attach it to struct se_cmd
1426 */
de103c93
CH		 1427 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1428 if (rc) {
1429 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1430 target_put_sess_cmd(se_cmd);
d6dfc868 1431 return 0;
735703ca 1432 }
b5b8e298
SG		 1433
1434 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1435 if (rc != 0) {
1436 transport_generic_request_failure(se_cmd, rc);
1437 return 0;
1438 }
1439
def2b339
NB		 1440 /*
1441 * Save pointers for SGLs containing protection information,
1442 * if present.
1443 */
1444 if (sgl_prot_count) {
1445 se_cmd->t_prot_sg = sgl_prot;
1446 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1447 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1448 }
d6e0175c 1449
a026757f
NB		 1450 /*
1451 * When a non zero sgl_count has been passed perform SGL passthrough
1452 * mapping for pre-allocated fabric memory instead of having target
1453 * core perform an internal SGL allocation..
1454 */
1455 if (sgl_count != 0) {
1456 BUG_ON(!sgl);
1457
944981c7
NB		 1458 /*
1459 * A work-around for tcm_loop as some userspace code via
1460 * scsi-generic do not memset their associated read buffers,
1461 * so go ahead and do that here for type non-data CDBs. Also
1462 * note that this is currently guaranteed to be a single SGL
1463 * for this case by target core in target_setup_cmd_from_cdb()
1464 * -> transport_generic_cmd_sequencer().
1465 */
1466 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1467 se_cmd->data_direction == DMA_FROM_DEVICE) {
1468 unsigned char *buf = NULL;
1469
1470 if (sgl)
1471 buf = kmap(sg_page(sgl)) + sgl->offset;
1472
1473 if (buf) {
1474 memset(buf, 0, sgl->length);
1475 kunmap(sg_page(sgl));
1476 }
1477 }
1478
a026757f
NB		 1479 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1480 sgl_bidi, sgl_bidi_count);
1481 if (rc != 0) {
de103c93 1482 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1483 return 0;
1484 }
1485 }
def2b339 1486
11e319ed
AG		 1487 /*
1488 * Check if we need to delay processing because of ALUA
1489 * Active/NonOptimized primary access state..
1490 */
1491 core_alua_check_nonop_delay(se_cmd);
1492
a6360785 1493 transport_handle_cdb_direct(se_cmd);
d6dfc868 1494 return 0;
a6360785 1495}
a026757f
NB		 1496EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1497
1498/*
1499 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1500 *
1501 * @se_cmd: command descriptor to submit
1502 * @se_sess: associated se_sess for endpoint
1503 * @cdb: pointer to SCSI CDB
1504 * @sense: pointer to SCSI sense buffer
1505 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1506 * @data_length: fabric expected data transfer length
1507 * @task_addr: SAM task attribute
1508 * @data_dir: DMA data direction
1509 * @flags: flags for command submission from target_sc_flags_tables
1510 *
649ee054
BVA		 1511 * Task tags are supported if the caller has set @se_cmd->tag.
1512 *
a026757f
NB		 1513 * Returns non zero to signal active I/O shutdown failure. All other
1514 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1515 * but still return zero here.
1516 *
1517 * This may only be called from process context, and also currently
1518 * assumes internal allocation of fabric payload buffer by target-core.
1519 *
1520 * It also assumes interal target core SGL memory allocation.
1521 */
1522int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1523 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1524 u32 data_length, int task_attr, int data_dir, int flags)
1525{
1526 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1527 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1528 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1529}
a6360785
NB		 1530EXPORT_SYMBOL(target_submit_cmd);
1531
9f0d05c2
NB		 1532static void target_complete_tmr_failure(struct work_struct *work)
1533{
1534 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1535
1536 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1537 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1538
1539 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1540}
1541
ea98d7f9
AG		 1542/**
1543 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1544 * for TMR CDBs
1545 *
1546 * @se_cmd: command descriptor to submit
1547 * @se_sess: associated se_sess for endpoint
1548 * @sense: pointer to SCSI sense buffer
1549 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1550 * @fabric_context: fabric context for TMR req
1551 * @tm_type: Type of TM request
c0974f89
NB		 1552 * @gfp: gfp type for caller
1553 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1554 * @flags: submit cmd flags
ea98d7f9
AG		 1555 *
1556 * Callable from all contexts.
1557 **/
1558
c7042cae 1559int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1560 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1561 void *fabric_tmr_ptr, unsigned char tm_type,
1562 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1563{
1564 struct se_portal_group *se_tpg;
1565 int ret;
1566
1567 se_tpg = se_sess->se_tpg;
1568 BUG_ON(!se_tpg);
1569
1570 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1571 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1572 /*
1573 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1574 * allocation failure.
1575 */
c0974f89 1576 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1577 if (ret < 0)
1578 return -ENOMEM;
ea98d7f9 1579
c0974f89
NB		 1580 if (tm_type == TMR_ABORT_TASK)
1581 se_cmd->se_tmr_req->ref_task_tag = tag;
1582
ea98d7f9 1583 /* See target_submit_cmd for commentary */
afc16604 1584 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1585 if (ret) {
1586 core_tmr_release_req(se_cmd->se_tmr_req);
1587 return ret;
1588 }
ea98d7f9 1589
ea98d7f9
AG		 1590 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1591 if (ret) {
9f0d05c2
NB		 1592 /*
1593 * For callback during failure handling, push this work off
1594 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1595 */
1596 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1597 schedule_work(&se_cmd->work);
c7042cae 1598 return 0;
ea98d7f9
AG		 1599 }
1600 transport_generic_handle_tmr(se_cmd);
c7042cae 1601 return 0;
ea98d7f9
AG		 1602}
1603EXPORT_SYMBOL(target_submit_tmr);
1604
cdbb70bb 1605/*
cf572a96 1606 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1607 * has completed.
1608 */
cf572a96 1609bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cb0df4d3
BVA		 1610 __releases(&cmd->t_state_lock)
1611 __acquires(&cmd->t_state_lock)
cdbb70bb 1612{
cdbb70bb
CH		 1613 bool was_active = false;
1614
cf572a96
CH		 1615 if (cmd->transport_state & CMD_T_BUSY) {
1616 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1617 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1618
cf572a96
CH		 1619 pr_debug("cmd %p waiting to complete\n", cmd);
1620 wait_for_completion(&cmd->task_stop_comp);
1621 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1622
1623 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1624 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1625 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1626 was_active = true;
1627 }
1628
cdbb70bb
CH		 1629 return was_active;
1630}
1631
c66ac9db
NB		 1632/*
1633 * Handle SAM-esque emulation for generic transport request failures.
1634 */
de103c93
CH		 1635void transport_generic_request_failure(struct se_cmd *cmd,
1636 sense_reason_t sense_reason)
c66ac9db 1637{
07bde79a
NB		 1638 int ret = 0;
1639
649ee054
BVA		 1640 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1641 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1642 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1643 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1644 cmd->t_state, sense_reason);
d43d6aea 1645 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1646 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1647 (cmd->transport_state & CMD_T_STOP) != 0,
1648 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1649
c66ac9db
NB		 1650 /*
1651 * For SAM Task Attribute emulation for failed struct se_cmd
1652 */
019c4ca6 1653 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1654 /*
1655 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1656 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1657 */
1658 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1659 cmd->transport_complete_callback)
c8e63985 1660 cmd->transport_complete_callback(cmd, false);
c66ac9db 1661
de103c93 1662 switch (sense_reason) {
03e98c9e
NB		 1663 case TCM_NON_EXISTENT_LUN:
1664 case TCM_UNSUPPORTED_SCSI_OPCODE:
1665 case TCM_INVALID_CDB_FIELD:
1666 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1667 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1668 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1669 case TCM_UNKNOWN_MODE_PAGE:
1670 case TCM_WRITE_PROTECTED:
e2397c70 1671 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1672 case TCM_CHECK_CONDITION_ABORT_CMD:
1673 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1674 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1675 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1676 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1677 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1678 break;
de103c93
CH		 1679 case TCM_OUT_OF_RESOURCES:
1680 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1681 break;
03e98c9e 1682 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1683 /*
1684 * No SENSE Data payload for this case, set SCSI Status
1685 * and queue the response to $FABRIC_MOD.
1686 *
1687 * Uses linux/include/scsi/scsi.h SAM status codes defs
1688 */
1689 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1690 /*
1691 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1692 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1693 * CONFLICT STATUS.
1694 *
1695 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1696 */
e3d6f909 1697 if (cmd->se_sess &&
0fd97ccf 1698 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1699 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1700 cmd->orig_fe_lun, 0x2C,
1701 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1702
e5c0d6ad
RD		 1703 trace_target_cmd_complete(cmd);
1704 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1705 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1706 goto queue_full;
c66ac9db 1707 goto check_stop;
c66ac9db 1708 default:
6708bb27 1709 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1710 cmd->t_task_cdb[0], sense_reason);
1711 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1712 break;
1713 }
f3146437 1714
de103c93 1715 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1716 if (ret == -EAGAIN || ret == -ENOMEM)
1717 goto queue_full;
07bde79a 1718
c66ac9db
NB		 1719check_stop:
1720 transport_lun_remove_cmd(cmd);
6708bb27 1721 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1722 ;
07bde79a
NB		 1723 return;
1724
1725queue_full:
e057f533
CH		 1726 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1727 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1728}
2fbff127 1729EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1730
76dde50e 1731void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1732{
de103c93 1733 sense_reason_t ret;
5f41a31d 1734
de103c93
CH		 1735 if (cmd->execute_cmd) {
1736 ret = cmd->execute_cmd(cmd);
1737 if (ret) {
1738 spin_lock_irq(&cmd->t_state_lock);
1739 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1740 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1741
de103c93
CH		 1742 transport_generic_request_failure(cmd, ret);
1743 }
5f41a31d
CH		 1744 }
1745}
1746
aa58b531
NB		 1747static int target_write_prot_action(struct se_cmd *cmd)
1748{
5132d1e6 1749 u32 sectors;
aa58b531
NB		 1750 /*
1751 * Perform WRITE_INSERT of PI using software emulation when backend
1752 * device has PI enabled, if the transport has not already generated
1753 * PI using hardware WRITE_INSERT offload.
1754 */
1755 switch (cmd->prot_op) {
1756 case TARGET_PROT_DOUT_INSERT:
1757 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1758 sbc_dif_generate(cmd);
1759 break;
5132d1e6
NB		 1760 case TARGET_PROT_DOUT_STRIP:
1761 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1762 break;
1763
1764 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1765 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1766 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1767 if (unlikely(cmd->pi_err)) {
1768 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1769 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1770 spin_unlock_irq(&cmd->t_state_lock);
1771 transport_generic_request_failure(cmd, cmd->pi_err);
1772 return -1;
1773 }
1774 break;
aa58b531
NB		 1775 default:
1776 break;
1777 }
1778
1779 return 0;
1780}
1781
019c4ca6 1782static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1783{
1784 struct se_device *dev = cmd->se_dev;
1785
a3541703 1786 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1787 return false;
5f41a31d 1788
c66ac9db 1789 /*
25985edc 1790 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1791 * to allow the passed struct se_cmd list of tasks to the front of the list.
1792 */
5f41a31d 1793 switch (cmd->sam_task_attr) {
68d81f40 1794 case TCM_HEAD_TAG:
5f41a31d
CH		 1795 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1796 "se_ordered_id: %u\n",
1797 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1798 return false;
68d81f40 1799 case TCM_ORDERED_TAG:
33940d09 1800 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1801
5f41a31d
CH		 1802 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1803 " se_ordered_id: %u\n",
1804 cmd->t_task_cdb[0], cmd->se_ordered_id);
1805
c66ac9db 1806 /*
5f41a31d
CH		 1807 * Execute an ORDERED command if no other older commands
1808 * exist that need to be completed first.
c66ac9db 1809 */
5f41a31d 1810 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1811 return false;
5f41a31d
CH		 1812 break;
1813 default:
c66ac9db
NB		 1814 /*
1815 * For SIMPLE and UNTAGGED Task Attribute commands
1816 */
33940d09 1817 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1818 break;
c66ac9db 1819 }
5f41a31d 1820
019c4ca6
CH		 1821 if (atomic_read(&dev->dev_ordered_sync) == 0)
1822 return false;
c66ac9db 1823
019c4ca6
CH		 1824 spin_lock(&dev->delayed_cmd_lock);
1825 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1826 spin_unlock(&dev->delayed_cmd_lock);
1827
1828 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1829 " delayed CMD list, se_ordered_id: %u\n",
1830 cmd->t_task_cdb[0], cmd->sam_task_attr,
1831 cmd->se_ordered_id);
1832 return true;
1833}
1834
1835void target_execute_cmd(struct se_cmd *cmd)
1836{
1837 /*
1838 * If the received CDB has aleady been aborted stop processing it here.
1839 */
4a9a6c8d 1840 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1841 return;
c66ac9db 1842
019c4ca6
CH		 1843 /*
1844 * Determine if frontend context caller is requesting the stopping of
1845 * this command for frontend exceptions.
1846 */
4a9a6c8d 1847 spin_lock_irq(&cmd->t_state_lock);
019c4ca6 1848 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1849 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1850 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1851
1852 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1853 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1854 return;
1855 }
1856
1857 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1858 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1859 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1860
1861 if (target_write_prot_action(cmd))
1862 return;
019c4ca6 1863
1a398b97
NB		 1864 if (target_handle_task_attr(cmd)) {
1865 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1866 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1867 spin_unlock_irq(&cmd->t_state_lock);
1868 return;
1869 }
1870
1871 __target_execute_cmd(cmd);
c66ac9db 1872}
70baf0ab 1873EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1874
5f41a31d
CH		 1875/*
1876 * Process all commands up to the last received ORDERED task attribute which
1877 * requires another blocking boundary
1878 */
1879static void target_restart_delayed_cmds(struct se_device *dev)
1880{
1881 for (;;) {
1882 struct se_cmd *cmd;
1883
1884 spin_lock(&dev->delayed_cmd_lock);
1885 if (list_empty(&dev->delayed_cmd_list)) {
1886 spin_unlock(&dev->delayed_cmd_lock);
1887 break;
1888 }
1889
1890 cmd = list_entry(dev->delayed_cmd_list.next,
1891 struct se_cmd, se_delayed_node);
1892 list_del(&cmd->se_delayed_node);
1893 spin_unlock(&dev->delayed_cmd_lock);
1894
1895 __target_execute_cmd(cmd);
1896
68d81f40 1897 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1898 break;
1899 }
1900}
1901
c66ac9db 1902/*
35e0e757 1903 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1904 * and ordered cmds need to have their tasks added to the execution queue.
1905 */
1906static void transport_complete_task_attr(struct se_cmd *cmd)
1907{
5951146d 1908 struct se_device *dev = cmd->se_dev;
c66ac9db 1909
a3541703 1910 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1911 return;
1912
68d81f40 1913 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1914 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1915 dev->dev_cur_ordered_id++;
6708bb27 1916 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1917 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1918 cmd->se_ordered_id);
68d81f40 1919 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1920 dev->dev_cur_ordered_id++;
6708bb27 1921 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1922 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1923 cmd->se_ordered_id);
68d81f40 1924 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1925 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1926
1927 dev->dev_cur_ordered_id++;
6708bb27 1928 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1929 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1930 }
c66ac9db 1931
5f41a31d 1932 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1933}
1934
e057f533 1935static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1936{
1937 int ret = 0;
1938
019c4ca6 1939 transport_complete_task_attr(cmd);
e057f533
CH		 1940
1941 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1942 trace_target_cmd_complete(cmd);
e057f533 1943 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1944 goto out;
e057f533 1945 }
07bde79a
NB		 1946
1947 switch (cmd->data_direction) {
1948 case DMA_FROM_DEVICE:
e5c0d6ad 1949 trace_target_cmd_complete(cmd);
07bde79a
NB		 1950 ret = cmd->se_tfo->queue_data_in(cmd);
1951 break;
1952 case DMA_TO_DEVICE:
64577407 1953 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1954 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1955 break;
07bde79a
NB		 1956 }
1957 /* Fall through for DMA_TO_DEVICE */
1958 case DMA_NONE:
e5c0d6ad 1959 trace_target_cmd_complete(cmd);
07bde79a
NB		 1960 ret = cmd->se_tfo->queue_status(cmd);
1961 break;
1962 default:
1963 break;
1964 }
1965
e057f533
CH		 1966out:
1967 if (ret < 0) {
1968 transport_handle_queue_full(cmd, cmd->se_dev);
1969 return;
1970 }
1971 transport_lun_remove_cmd(cmd);
1972 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1973}
1974
1975static void transport_handle_queue_full(
1976 struct se_cmd *cmd,
e057f533 1977 struct se_device *dev)
07bde79a
NB		 1978{
1979 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 1980 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 1981 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 1982 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1983
1984 schedule_work(&cmd->se_dev->qf_work_queue);
1985}
1986
fdeab852 1987static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 1988{
fdeab852
NB		 1989 switch (cmd->prot_op) {
1990 case TARGET_PROT_DIN_STRIP:
1991 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 1992 u32 sectors = cmd->data_length >>
1993 ilog2(cmd->se_dev->dev_attrib.block_size);
1994
1995 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1996 sectors, 0, cmd->t_prot_sg,
1997 0);
1998 if (cmd->pi_err)
fdeab852 1999 return true;
bc005869 2000 }
fdeab852 2001 break;
72c03850
NB		 2002 case TARGET_PROT_DIN_INSERT:
2003 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2004 break;
2005
2006 sbc_dif_generate(cmd);
2007 break;
fdeab852
NB		 2008 default:
2009 break;
bc005869
NB		 2010 }
2011
2012 return false;
2013}
2014
35e0e757 2015static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2016{
35e0e757 2017 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2018 int ret;
35e0e757 2019
c66ac9db
NB		 2020 /*
2021 * Check if we need to move delayed/dormant tasks from cmds on the
2022 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2023 * Attribute.
2024 */
019c4ca6
CH		 2025 transport_complete_task_attr(cmd);
2026
07bde79a
NB		 2027 /*
2028 * Check to schedule QUEUE_FULL work, or execute an existing
2029 * cmd->transport_qf_callback()
2030 */
2031 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2032 schedule_work(&cmd->se_dev->qf_work_queue);
2033
c66ac9db 2034 /*
d5829eac 2035 * Check if we need to send a sense buffer from
c66ac9db
NB		 2036 * the struct se_cmd in question.
2037 */
2038 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2039 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2040 ret = transport_send_check_condition_and_sense(
2041 cmd, 0, 1);
2042 if (ret == -EAGAIN || ret == -ENOMEM)
2043 goto queue_full;
2044
2045 transport_lun_remove_cmd(cmd);
2046 transport_cmd_check_stop_to_fabric(cmd);
2047 return;
c66ac9db
NB		 2048 }
2049 /*
25985edc 2050 * Check for a callback, used by amongst other things
a6b0133c 2051 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2052 */
a6b0133c
NB		 2053 if (cmd->transport_complete_callback) {
2054 sense_reason_t rc;
2055
c8e63985 2056 rc = cmd->transport_complete_callback(cmd, true);
a2890087 2057 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
c8e63985
NB		 2058 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2059 !cmd->data_length)
2060 goto queue_rsp;
2061
a6b0133c 2062 return;
a2890087
NB		 2063 } else if (rc) {
2064 ret = transport_send_check_condition_and_sense(cmd,
2065 rc, 0);
2066 if (ret == -EAGAIN || ret == -ENOMEM)
2067 goto queue_full;
a6b0133c 2068
a2890087
NB		 2069 transport_lun_remove_cmd(cmd);
2070 transport_cmd_check_stop_to_fabric(cmd);
2071 return;
2072 }
a6b0133c 2073 }
c66ac9db 2074
c8e63985 2075queue_rsp:
c66ac9db
NB		 2076 switch (cmd->data_direction) {
2077 case DMA_FROM_DEVICE:
2078 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2079 if (cmd->se_lun->lun_sep) {
2080 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2081 cmd->data_length;
2082 }
2083 spin_unlock(&cmd->se_lun->lun_sep_lock);
bc005869
NB		 2084 /*
2085 * Perform READ_STRIP of PI using software emulation when
2086 * backend had PI enabled, if the transport will not be
2087 * performing hardware READ_STRIP offload.
2088 */
fdeab852 2089 if (target_read_prot_action(cmd)) {
bc005869
NB		 2090 ret = transport_send_check_condition_and_sense(cmd,
2091 cmd->pi_err, 0);
2092 if (ret == -EAGAIN || ret == -ENOMEM)
2093 goto queue_full;
2094
2095 transport_lun_remove_cmd(cmd);
2096 transport_cmd_check_stop_to_fabric(cmd);
2097 return;
2098 }
c66ac9db 2099
e5c0d6ad 2100 trace_target_cmd_complete(cmd);
07bde79a 2101 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2102 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2103 goto queue_full;
c66ac9db
NB		 2104 break;
2105 case DMA_TO_DEVICE:
2106 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2107 if (cmd->se_lun->lun_sep) {
2108 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2109 cmd->data_length;
2110 }
2111 spin_unlock(&cmd->se_lun->lun_sep_lock);
2112 /*
2113 * Check if we need to send READ payload for BIDI-COMMAND
2114 */
64577407 2115 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 2116 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2117 if (cmd->se_lun->lun_sep) {
2118 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2119 cmd->data_length;
2120 }
2121 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2122 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2123 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2124 goto queue_full;
c66ac9db
NB		 2125 break;
2126 }
2127 /* Fall through for DMA_TO_DEVICE */
2128 case DMA_NONE:
e5c0d6ad 2129 trace_target_cmd_complete(cmd);
07bde79a 2130 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2131 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2132 goto queue_full;
c66ac9db
NB		 2133 break;
2134 default:
2135 break;
2136 }
2137
2138 transport_lun_remove_cmd(cmd);
2139 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2140 return;
2141
2142queue_full:
6708bb27 2143 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2144 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2145 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2146 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2147}
2148
6708bb27 2149static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2150{
ec98f782 2151 struct scatterlist *sg;
ec98f782 2152 int count;
c66ac9db 2153
6708bb27
AG		 2154 for_each_sg(sgl, sg, nents, count)
2155 __free_page(sg_page(sg));
c66ac9db 2156
6708bb27
AG		 2157 kfree(sgl);
2158}
c66ac9db 2159
47e459e6
NB		 2160static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2161{
2162 /*
2163 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2164 * emulation, and free + reset pointers if necessary..
2165 */
2166 if (!cmd->t_data_sg_orig)
2167 return;
2168
2169 kfree(cmd->t_data_sg);
2170 cmd->t_data_sg = cmd->t_data_sg_orig;
2171 cmd->t_data_sg_orig = NULL;
2172 cmd->t_data_nents = cmd->t_data_nents_orig;
2173 cmd->t_data_nents_orig = 0;
2174}
2175
6708bb27
AG		 2176static inline void transport_free_pages(struct se_cmd *cmd)
2177{
5835812f
AM		 2178 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2179 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2180 cmd->t_prot_sg = NULL;
2181 cmd->t_prot_nents = 0;
2182 }
2183
47e459e6 2184 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2185 /*
2186 * Release special case READ buffer payload required for
2187 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2188 */
2189 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2190 transport_free_sgl(cmd->t_bidi_data_sg,
2191 cmd->t_bidi_data_nents);
2192 cmd->t_bidi_data_sg = NULL;
2193 cmd->t_bidi_data_nents = 0;
2194 }
47e459e6 2195 transport_reset_sgl_orig(cmd);
6708bb27 2196 return;
47e459e6
NB		 2197 }
2198 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2199
2200 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2201 cmd->t_data_sg = NULL;
2202 cmd->t_data_nents = 0;
c66ac9db 2203
6708bb27 2204 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2205 cmd->t_bidi_data_sg = NULL;
2206 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2207}
2208
e26d99ae
CH		 2209/**
2210 * transport_release_cmd - free a command
2211 * @cmd: command to free
2212 *
2213 * This routine unconditionally frees a command, and reference counting
2214 * or list removal must be done in the caller.
2215 */
d5ddad41 2216static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2217{
2218 BUG_ON(!cmd->se_tfo);
2219
c8e31f26 2220 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2221 core_tmr_release_req(cmd->se_tmr_req);
2222 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2223 kfree(cmd->t_task_cdb);
2224 /*
7481deb4
NB		 2225 * If this cmd has been setup with target_get_sess_cmd(), drop
2226 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2227 */
afc16604 2228 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2229}
2230
d3df7825
CH		 2231/**
2232 * transport_put_cmd - release a reference to a command
2233 * @cmd: command to release
2234 *
2235 * This routine releases our reference to the command and frees it if possible.
2236 */
d5ddad41 2237static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2238{
c66ac9db 2239 transport_free_pages(cmd);
d5ddad41 2240 return transport_release_cmd(cmd);
c66ac9db 2241}
c66ac9db 2242
4949314c 2243void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2244{
ec98f782 2245 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2246 struct page **pages;
2247 int i;
05d1c7c0
AG		 2248
2249 /*
ec98f782
AG		 2250 * We need to take into account a possible offset here for fabrics like
2251 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2252 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2253 */
4949314c
AG		 2254 if (!cmd->t_data_nents)
2255 return NULL;
3717ef0c
PB		 2256
2257 BUG_ON(!sg);
2258 if (cmd->t_data_nents == 1)
4949314c
AG		 2259 return kmap(sg_page(sg)) + sg->offset;
2260
2261 /* >1 page. use vmap */
2262 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2263 if (!pages)
4949314c
AG		 2264 return NULL;
2265
2266 /* convert sg[] to pages[] */
2267 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2268 pages[i] = sg_page(sg);
2269 }
2270
2271 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2272 kfree(pages);
de103c93 2273 if (!cmd->t_data_vmap)
4949314c
AG		 2274 return NULL;
2275
2276 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2277}
4949314c 2278EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2279
4949314c 2280void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2281{
a1edf9cf 2282 if (!cmd->t_data_nents) {
4949314c 2283 return;
a1edf9cf 2284 } else if (cmd->t_data_nents == 1) {
4949314c 2285 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2286 return;
2287 }
4949314c
AG		 2288
2289 vunmap(cmd->t_data_vmap);
2290 cmd->t_data_vmap = NULL;
05d1c7c0 2291}
4949314c 2292EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2293
c5ff8d6b 2294int
20093994
NB		 2295target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2296 bool zero_page)
c66ac9db 2297{
20093994 2298 struct scatterlist *sg;
ec98f782 2299 struct page *page;
20093994
NB		 2300 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2301 unsigned int nent;
ec98f782 2302 int i = 0;
c66ac9db 2303
20093994
NB		 2304 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2305 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2306 if (!sg)
ec98f782 2307 return -ENOMEM;
c66ac9db 2308
20093994 2309 sg_init_table(sg, nent);
9db9da33 2310
ec98f782
AG		 2311 while (length) {
2312 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2313 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2314 if (!page)
2315 goto out;
c66ac9db 2316
20093994 2317 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2318 length -= page_len;
2319 i++;
c66ac9db 2320 }
20093994
NB		 2321 *sgl = sg;
2322 *nents = nent;
c66ac9db 2323 return 0;
c66ac9db 2324
ec98f782 2325out:
d0e27c88 2326 while (i > 0) {
ec98f782 2327 i--;
20093994 2328 __free_page(sg_page(&sg[i]));
c66ac9db 2329 }
20093994 2330 kfree(sg);
ec98f782 2331 return -ENOMEM;
c66ac9db
NB		 2332}
2333
da0f7619 2334/*
b16a35b0
AG		 2335 * Allocate any required resources to execute the command. For writes we
2336 * might not have the payload yet, so notify the fabric via a call to
2337 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2338 */
de103c93
CH		 2339sense_reason_t
2340transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2341{
c66ac9db 2342 int ret = 0;
c8e63985 2343 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2344
5835812f
AM		 2345 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2346 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2347 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2348 cmd->prot_length, true);
2349 if (ret < 0)
2350 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2351 }
2352
c66ac9db
NB		 2353 /*
2354 * Determine is the TCM fabric module has already allocated physical
2355 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2356 * beforehand.
c66ac9db 2357 */
ec98f782
AG		 2358 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2359 cmd->data_length) {
20093994 2360
8cefe07b
NB		 2361 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2362 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2363 u32 bidi_length;
2364
2365 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2366 bidi_length = cmd->t_task_nolb *
2367 cmd->se_dev->dev_attrib.block_size;
2368 else
2369 bidi_length = cmd->data_length;
2370
2371 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2372 &cmd->t_bidi_data_nents,
2373 bidi_length, zero_flag);
2374 if (ret < 0)
2375 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2376 }
2377
20093994
NB		 2378 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2379 cmd->data_length, zero_flag);
c66ac9db 2380 if (ret < 0)
de103c93 2381 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2382 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2383 cmd->data_length) {
2384 /*
2385 * Special case for COMPARE_AND_WRITE with fabrics
2386 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2387 */
2388 u32 caw_length = cmd->t_task_nolb *
2389 cmd->se_dev->dev_attrib.block_size;
2390
2391 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2392 &cmd->t_bidi_data_nents,
2393 caw_length, zero_flag);
2394 if (ret < 0)
2395 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2396 }
c66ac9db 2397 /*
c3196f0c
CH		 2398 * If this command is not a write we can execute it right here,
2399 * for write buffers we need to notify the fabric driver first
2400 * and let it call back once the write buffers are ready.
c66ac9db 2401 */
5f41a31d 2402 target_add_to_state_list(cmd);
885e7b0e 2403 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2404 target_execute_cmd(cmd);
2405 return 0;
2406 }
862e6389 2407 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2408
2409 ret = cmd->se_tfo->write_pending(cmd);
2410 if (ret == -EAGAIN || ret == -ENOMEM)
2411 goto queue_full;
2412
de103c93
CH		 2413 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2414 WARN_ON(ret);
2415
b69c1fcf 2416 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2417
c3196f0c
CH		 2418queue_full:
2419 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2420 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2421 transport_handle_queue_full(cmd, cmd->se_dev);
2422 return 0;
c66ac9db 2423}
a1d8b49a 2424EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2425
e057f533 2426static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2427{
f147abb4
NB		 2428 int ret;
2429
2430 ret = cmd->se_tfo->write_pending(cmd);
2431 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2432 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2433 cmd);
2434 transport_handle_queue_full(cmd, cmd->se_dev);
2435 }
07bde79a
NB		 2436}
2437
d5ddad41 2438int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2439{
c130480b 2440 unsigned long flags;
d5ddad41
NB		 2441 int ret = 0;
2442
d14921d6 2443 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2444 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2445 transport_wait_for_tasks(cmd);
2446
d5ddad41 2447 ret = transport_release_cmd(cmd);
d14921d6
NB		 2448 } else {
2449 if (wait_for_tasks)
2450 transport_wait_for_tasks(cmd);
c130480b
NB		 2451 /*
2452 * Handle WRITE failure case where transport_generic_new_cmd()
2453 * has already added se_cmd to state_list, but fabric has
2454 * failed command before I/O submission.
2455 */
2456 if (cmd->state_active) {
2457 spin_lock_irqsave(&cmd->t_state_lock, flags);
2458 target_remove_from_state_list(cmd);
2459 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2460 }
d14921d6 2461
82f1c8a4 2462 if (cmd->se_lun)
c66ac9db 2463 transport_lun_remove_cmd(cmd);
c66ac9db 2464
d5ddad41 2465 ret = transport_put_cmd(cmd);
c66ac9db 2466 }
d5ddad41 2467 return ret;
c66ac9db
NB		 2468}
2469EXPORT_SYMBOL(transport_generic_free_cmd);
2470
a17f091d 2471/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2472 * @se_cmd: command descriptor to add
a6360785 2473 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2474 */
afc16604 2475int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2476{
afc16604 2477 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2478 unsigned long flags;
bc187ea6 2479 int ret = 0;
a17f091d 2480
a6360785
NB		 2481 /*
2482 * Add a second kref if the fabric caller is expecting to handle
2483 * fabric acknowledgement that requires two target_put_sess_cmd()
2484 * invocations before se_cmd descriptor release.
2485 */
054922bb 2486 if (ack_kref)
a6360785 2487 kref_get(&se_cmd->cmd_kref);
7481deb4 2488
a17f091d 2489 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2490 if (se_sess->sess_tearing_down) {
2491 ret = -ESHUTDOWN;
2492 goto out;
2493 }
a17f091d 2494 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2495out:
a17f091d 2496 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2497
2498 if (ret && ack_kref)
afc16604 2499 target_put_sess_cmd(se_cmd);
7544e597 2500
bc187ea6 2501 return ret;
a17f091d 2502}
20361e69 2503EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2504
7481deb4 2505static void target_release_cmd_kref(struct kref *kref)
077aa3b2 2506 __releases(&se_cmd->se_sess->sess_cmd_lock)
a17f091d 2507{
7481deb4
NB		 2508 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2509 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2510
a17f091d 2511 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2512 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2513 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2514 return;
a17f091d 2515 }
a17f091d 2516 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2517 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2518 complete(&se_cmd->cmd_wait_comp);
7481deb4 2519 return;
a17f091d
NB		 2520 }
2521 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2522 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2523
7481deb4
NB		 2524 se_cmd->se_tfo->release_cmd(se_cmd);
2525}
2526
2527/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2528 * @se_cmd: command descriptor to drop
2529 */
afc16604 2530int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2531{
afc16604
BVA		 2532 struct se_session *se_sess = se_cmd->se_sess;
2533
0ed6e189
NB		 2534 if (!se_sess) {
2535 se_cmd->se_tfo->release_cmd(se_cmd);
2536 return 1;
2537 }
ccf5ae83
JE		 2538 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2539 &se_sess->sess_cmd_lock);
a17f091d
NB		 2540}
2541EXPORT_SYMBOL(target_put_sess_cmd);
2542
1c7b13fe
RD		 2543/* target_sess_cmd_list_set_waiting - Flag all commands in
2544 * sess_cmd_list to complete cmd_wait_comp. Set
2545 * sess_tearing_down so no more commands are queued.
2546 * @se_sess: session to flag
a17f091d 2547 */
1c7b13fe 2548void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2549{
2550 struct se_cmd *se_cmd;
2551 unsigned long flags;
2552
a17f091d 2553 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2554 if (se_sess->sess_tearing_down) {
2555 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2556 return;
2557 }
1c7b13fe 2558 se_sess->sess_tearing_down = 1;
9b31a328 2559 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2560
9b31a328 2561 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2562 se_cmd->cmd_wait_set = 1;
2563
2564 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2565}
1c7b13fe 2566EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2567
2568/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2569 * @se_sess: session to wait for active I/O
a17f091d 2570 */
be646c2d 2571void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2572{
2573 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2574 unsigned long flags;
a17f091d
NB		 2575
2576 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2577 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2578 list_del(&se_cmd->se_cmd_list);
2579
2580 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2581 " %d\n", se_cmd, se_cmd->t_state,
2582 se_cmd->se_tfo->get_cmd_state(se_cmd));
2583
be646c2d
JE		 2584 wait_for_completion(&se_cmd->cmd_wait_comp);
2585 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2586 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2587 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2588
2589 se_cmd->se_tfo->release_cmd(se_cmd);
2590 }
9b31a328
NB		 2591
2592 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2593 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2594 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2595
a17f091d
NB		 2596}
2597EXPORT_SYMBOL(target_wait_for_sess_cmds);
2598
b3eeea66 2599void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2600{
5277797d 2601 percpu_ref_kill(&lun->lun_ref);
5277797d 2602 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2603}
2604
d14921d6
NB		 2605/**
2606 * transport_wait_for_tasks - wait for completion to occur
2607 * @cmd: command to wait
c66ac9db 2608 *
d14921d6
NB		 2609 * Called from frontend fabric context to wait for storage engine
2610 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2611 */
a17f091d 2612bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2613{
2614 unsigned long flags;
2615
a1d8b49a 2616 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2617 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2618 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2619 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2620 return false;
d14921d6 2621 }
cb4f4d3c 2622
c8e31f26
AG		 2623 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2624 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2626 return false;
d14921d6 2627 }
7d680f3b 2628
3d28934a 2629 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2631 return false;
d14921d6 2632 }
c66ac9db 2633
7d680f3b 2634 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2635
649ee054
BVA		 2636 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n",
2637 cmd, cmd->tag, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2638
a1d8b49a 2639 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2640
a1d8b49a 2641 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2642
a1d8b49a 2643 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2644 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2645
649ee054
BVA		 2646 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n",
2647 cmd->tag);
c66ac9db 2648
d14921d6 2649 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2650
2651 return true;
c66ac9db 2652}
d14921d6 2653EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2654
2655static int transport_get_sense_codes(
2656 struct se_cmd *cmd,
2657 u8 *asc,
2658 u8 *ascq)
2659{
2660 *asc = cmd->scsi_asc;
2661 *ascq = cmd->scsi_ascq;
2662
2663 return 0;
2664}
2665
76736db3
SG		 2666static
2667void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2668{
2669 /* Place failed LBA in sense data information descriptor 0. */
2670 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2671 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2672 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2673 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2674
2675 /* Descriptor Information: failing sector */
2676 put_unaligned_be64(bad_sector, &buffer[12]);
2677}
2678
de103c93
CH		 2679int
2680transport_send_check_condition_and_sense(struct se_cmd *cmd,
2681 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2682{
2683 unsigned char *buffer = cmd->sense_buffer;
2684 unsigned long flags;
c66ac9db
NB		 2685 u8 asc = 0, ascq = 0;
2686
a1d8b49a 2687 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2688 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2689 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2690 return 0;
2691 }
2692 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2693 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2694
2695 if (!reason && from_transport)
2696 goto after_reason;
2697
2698 if (!from_transport)
2699 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2700
c66ac9db
NB		 2701 /*
2702 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2703 * SENSE KEY values from include/scsi/scsi.h
2704 */
2705 switch (reason) {
ba829137
HR		 2706 case TCM_NO_SENSE:
2707 /* CURRENT ERROR */
2708 buffer[0] = 0x70;
2709 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2710 /* Not Ready */
2711 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2712 /* NO ADDITIONAL SENSE INFORMATION */
2713 buffer[SPC_ASC_KEY_OFFSET] = 0;
2714 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2715 break;
c66ac9db 2716 case TCM_NON_EXISTENT_LUN:
eb39d340 2717 /* CURRENT ERROR */
9c58b7dd
RD		 2718 buffer[0] = 0x70;
2719 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2720 /* ILLEGAL REQUEST */
9c58b7dd 2721 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2722 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2723 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2724 break;
c66ac9db
NB		 2725 case TCM_UNSUPPORTED_SCSI_OPCODE:
2726 case TCM_SECTOR_COUNT_TOO_MANY:
2727 /* CURRENT ERROR */
9c58b7dd
RD		 2728 buffer[0] = 0x70;
2729 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2730 /* ILLEGAL REQUEST */
9c58b7dd 2731 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2732 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2733 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2734 break;
2735 case TCM_UNKNOWN_MODE_PAGE:
2736 /* CURRENT ERROR */
9c58b7dd
RD		 2737 buffer[0] = 0x70;
2738 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2739 /* ILLEGAL REQUEST */
9c58b7dd 2740 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2741 /* INVALID FIELD IN CDB */
9c58b7dd 2742 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2743 break;
2744 case TCM_CHECK_CONDITION_ABORT_CMD:
2745 /* CURRENT ERROR */
9c58b7dd
RD		 2746 buffer[0] = 0x70;
2747 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2748 /* ABORTED COMMAND */
9c58b7dd 2749 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2750 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2751 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2752 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2753 break;
2754 case TCM_INCORRECT_AMOUNT_OF_DATA:
2755 /* CURRENT ERROR */
9c58b7dd
RD		 2756 buffer[0] = 0x70;
2757 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2758 /* ABORTED COMMAND */
9c58b7dd 2759 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2760 /* WRITE ERROR */
9c58b7dd 2761 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2762 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2763 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2764 break;
2765 case TCM_INVALID_CDB_FIELD:
2766 /* CURRENT ERROR */
9c58b7dd
RD		 2767 buffer[0] = 0x70;
2768 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2769 /* ILLEGAL REQUEST */
9c58b7dd 2770 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2771 /* INVALID FIELD IN CDB */
9c58b7dd 2772 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2773 break;
2774 case TCM_INVALID_PARAMETER_LIST:
2775 /* CURRENT ERROR */
9c58b7dd
RD		 2776 buffer[0] = 0x70;
2777 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2778 /* ILLEGAL REQUEST */
9c58b7dd 2779 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2780 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2781 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2782 break;
bb992e72
RD		 2783 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2784 /* CURRENT ERROR */
2785 buffer[0] = 0x70;
2786 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2787 /* ILLEGAL REQUEST */
2788 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2789 /* PARAMETER LIST LENGTH ERROR */
2790 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2791 break;
c66ac9db
NB		 2792 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2793 /* CURRENT ERROR */
9c58b7dd
RD		 2794 buffer[0] = 0x70;
2795 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2796 /* ABORTED COMMAND */
9c58b7dd 2797 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2798 /* WRITE ERROR */
9c58b7dd 2799 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2800 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2801 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2802 break;
2803 case TCM_SERVICE_CRC_ERROR:
2804 /* CURRENT ERROR */
9c58b7dd
RD		 2805 buffer[0] = 0x70;
2806 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2807 /* ABORTED COMMAND */
9c58b7dd 2808 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2809 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2810 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2811 /* N/A */
9c58b7dd 2812 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2813 break;
2814 case TCM_SNACK_REJECTED:
2815 /* CURRENT ERROR */
9c58b7dd
RD		 2816 buffer[0] = 0x70;
2817 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2818 /* ABORTED COMMAND */
9c58b7dd 2819 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2820 /* READ ERROR */
9c58b7dd 2821 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2822 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2823 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2824 break;
2825 case TCM_WRITE_PROTECTED:
2826 /* CURRENT ERROR */
9c58b7dd
RD		 2827 buffer[0] = 0x70;
2828 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2829 /* DATA PROTECT */
9c58b7dd 2830 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2831 /* WRITE PROTECTED */
9c58b7dd 2832 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2833 break;
e2397c70
RD		 2834 case TCM_ADDRESS_OUT_OF_RANGE:
2835 /* CURRENT ERROR */
9c58b7dd
RD		 2836 buffer[0] = 0x70;
2837 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2838 /* ILLEGAL REQUEST */
9c58b7dd 2839 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2840 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2841 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2842 break;
c66ac9db
NB		 2843 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2844 /* CURRENT ERROR */
9c58b7dd
RD		 2845 buffer[0] = 0x70;
2846 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2847 /* UNIT ATTENTION */
9c58b7dd 2848 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2849 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2850 buffer[SPC_ASC_KEY_OFFSET] = asc;
2851 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2852 break;
2853 case TCM_CHECK_CONDITION_NOT_READY:
2854 /* CURRENT ERROR */
9c58b7dd
RD		 2855 buffer[0] = 0x70;
2856 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2857 /* Not Ready */
9c58b7dd 2858 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2859 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2860 buffer[SPC_ASC_KEY_OFFSET] = asc;
2861 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2862 break;
818b571c
NB		 2863 case TCM_MISCOMPARE_VERIFY:
2864 /* CURRENT ERROR */
2865 buffer[0] = 0x70;
2866 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2867 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2868 /* MISCOMPARE DURING VERIFY OPERATION */
2869 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2870 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2871 break;
fcc4f17b
NB		 2872 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2873 /* CURRENT ERROR */
2874 buffer[0] = 0x70;
2875 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2876 /* ILLEGAL REQUEST */
2877 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2878 /* LOGICAL BLOCK GUARD CHECK FAILED */
2879 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2880 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
76736db3 2881 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2882 break;
2883 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2884 /* CURRENT ERROR */
2885 buffer[0] = 0x70;
2886 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2887 /* ILLEGAL REQUEST */
2888 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2889 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2890 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2891 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
76736db3 2892 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2893 break;
2894 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2895 /* CURRENT ERROR */
2896 buffer[0] = 0x70;
2897 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2898 /* ILLEGAL REQUEST */
2899 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2900 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2901 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2902 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
76736db3 2903 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b 2904 break;
c66ac9db
NB		 2905 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2906 default:
2907 /* CURRENT ERROR */
9c58b7dd
RD		 2908 buffer[0] = 0x70;
2909 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2910 /*
2911 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2912 * Solaris initiators. Returning NOT READY instead means the
2913 * operations will be retried a finite number of times and we
2914 * can survive intermittent errors.
2915 */
2916 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2917 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2918 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2919 break;
2920 }
2921 /*
2922 * This code uses linux/include/scsi/scsi.h SAM status codes!
2923 */
2924 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2925 /*
2926 * Automatically padded, this value is encoded in the fabric's
2927 * data_length response PDU containing the SCSI defined sense data.
2928 */
9c58b7dd 2929 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2930
2931after_reason:
e5c0d6ad 2932 trace_target_cmd_complete(cmd);
07bde79a 2933 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2934}
2935EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2936
2937int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2938{
c18bc7d8
RD		 2939 if (!(cmd->transport_state & CMD_T_ABORTED))
2940 return 0;
c66ac9db 2941
68259b5a
AL		 2942 /*
2943 * If cmd has been aborted but either no status is to be sent or it has
2944 * already been sent, just return
2945 */
2946 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2947 return 1;
8b1e1244 2948
649ee054
BVA		 2949 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n",
2950 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2951
68259b5a 2952 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2953 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2954 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2955 cmd->se_tfo->queue_status(cmd);
2956
2957 return 1;
c66ac9db
NB		 2958}
2959EXPORT_SYMBOL(transport_check_aborted_status);
2960
2961void transport_send_task_abort(struct se_cmd *cmd)
2962{
c252f003
NB		 2963 unsigned long flags;
2964
2965 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2966 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2967 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2968 return;
2969 }
2970 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2971
c66ac9db
NB		 2972 /*
2973 * If there are still expected incoming fabric WRITEs, we wait
2974 * until until they have completed before sending a TASK_ABORTED
2975 * response. This response with TASK_ABORTED status will be
2976 * queued back to fabric module by transport_check_aborted_status().
2977 */
2978 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2979 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2980 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 2981 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
29f4c090 2982 return;
c66ac9db
NB		 2983 }
2984 }
2985 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2986
72b59d6e
RD		 2987 transport_lun_remove_cmd(cmd);
2988
649ee054
BVA		 2989 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
2990 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2991
e5c0d6ad 2992 trace_target_cmd_complete(cmd);
e3d6f909 2993 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2994}
2995
af877292 2996static void target_tmr_work(struct work_struct *work)
c66ac9db 2997{
af877292 2998 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2999 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3000 struct se_tmr_req *tmr = cmd->se_tmr_req;
3001 int ret;
3002
3003 switch (tmr->function) {
5c6cd613 3004 case TMR_ABORT_TASK:
3d28934a 3005 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3006 break;
5c6cd613
NB		 3007 case TMR_ABORT_TASK_SET:
3008 case TMR_CLEAR_ACA:
3009 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3010 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3011 break;
5c6cd613 3012 case TMR_LUN_RESET:
c66ac9db
NB		 3013 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3014 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3015 TMR_FUNCTION_REJECTED;
3016 break;
5c6cd613 3017 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3018 tmr->response = TMR_FUNCTION_REJECTED;
3019 break;
5c6cd613 3020 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3021 tmr->response = TMR_FUNCTION_REJECTED;
3022 break;
c66ac9db 3023 default:
6708bb27 3024 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3025 tmr->function);
3026 tmr->response = TMR_FUNCTION_REJECTED;
3027 break;
3028 }
3029
3030 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3031 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3032
b7b8bef7 3033 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3034}
3035
af877292
CH		 3036int transport_generic_handle_tmr(
3037 struct se_cmd *cmd)
c66ac9db 3038{
f15e9cd9
NB		 3039 unsigned long flags;
3040
3041 spin_lock_irqsave(&cmd->t_state_lock, flags);
3042 cmd->transport_state |= CMD_T_ACTIVE;
3043 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3044
af877292
CH		 3045 INIT_WORK(&cmd->work, target_tmr_work);
3046 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3047 return 0;
3048}
af877292 3049EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3050
3051bool
3052target_check_wce(struct se_device *dev)
3053{
3054 bool wce = false;
3055
3056 if (dev->transport->get_write_cache)
3057 wce = dev->transport->get_write_cache(dev);
3058 else if (dev->dev_attrib.emulate_write_cache > 0)
3059 wce = true;
3060
3061 return wce;
3062}
3063
3064bool
3065target_check_fua(struct se_device *dev)
3066{
3067 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3068}
Linux 6.x block layer and io_uring tree(s)