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target: Move task tag into struct se_cmd + support 64-bit tags
[deliverable/linux.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
NB		 47#include <target/target_core_configfs.h>
48
e26d99ae 49#include "target_core_internal.h"
c66ac9db 50#include "target_core_alua.h"
c66ac9db 51#include "target_core_pr.h"
c66ac9db
NB		 52#include "target_core_ua.h"
53
e5c0d6ad
RD		 54#define CREATE_TRACE_POINTS
55#include <trace/events/target.h>
56
35e0e757 57static struct workqueue_struct *target_completion_wq;
c66ac9db 58static struct kmem_cache *se_sess_cache;
c66ac9db 59struct kmem_cache *se_ua_cache;
c66ac9db
NB		 60struct kmem_cache *t10_pr_reg_cache;
61struct kmem_cache *t10_alua_lu_gp_cache;
62struct kmem_cache *t10_alua_lu_gp_mem_cache;
63struct kmem_cache *t10_alua_tg_pt_gp_cache;
64struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
229d4f11
HR		 65struct kmem_cache *t10_alua_lba_map_cache;
66struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 67
c66ac9db 68static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 69static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 70 struct se_device *dev);
d5ddad41 71static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 72static void target_complete_ok_work(struct work_struct *work);
c66ac9db 73
e3d6f909 74int init_se_kmem_caches(void)
c66ac9db 75{
c66ac9db
NB		 76 se_sess_cache = kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session), __alignof__(struct se_session),
78 0, NULL);
6708bb27
AG		 79 if (!se_sess_cache) {
80 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 81 " failed\n");
c8e31f26 82 goto out;
c66ac9db
NB		 83 }
84 se_ua_cache = kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua), __alignof__(struct se_ua),
86 0, NULL);
6708bb27
AG		 87 if (!se_ua_cache) {
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 89 goto out_free_sess_cache;
c66ac9db 90 }
c66ac9db
NB		 91 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration),
93 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 94 if (!t10_pr_reg_cache) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 96 " failed\n");
35e0e757 97 goto out_free_ua_cache;
c66ac9db
NB		 98 }
99 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
101 0, NULL);
6708bb27
AG		 102 if (!t10_alua_lu_gp_cache) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 104 " failed\n");
35e0e757 105 goto out_free_pr_reg_cache;
c66ac9db
NB		 106 }
107 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member),
109 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 110 if (!t10_alua_lu_gp_mem_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 112 "cache failed\n");
35e0e757 113 goto out_free_lu_gp_cache;
c66ac9db
NB		 114 }
115 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp),
117 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 118 if (!t10_alua_tg_pt_gp_cache) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 120 "cache failed\n");
35e0e757 121 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 122 }
123 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member),
126 __alignof__(struct t10_alua_tg_pt_gp_member),
127 0, NULL);
6708bb27
AG		 128 if (!t10_alua_tg_pt_gp_mem_cache) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 130 "mem_t failed\n");
35e0e757 131 goto out_free_tg_pt_gp_cache;
c66ac9db 132 }
229d4f11
HR		 133 t10_alua_lba_map_cache = kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map),
136 __alignof__(struct t10_alua_lba_map), 0, NULL);
137 if (!t10_alua_lba_map_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
139 "cache failed\n");
140 goto out_free_tg_pt_gp_mem_cache;
141 }
142 t10_alua_lba_map_mem_cache = kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member),
145 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
146 if (!t10_alua_lba_map_mem_cache) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
148 "cache failed\n");
149 goto out_free_lba_map_cache;
150 }
c66ac9db 151
35e0e757
CH		 152 target_completion_wq = alloc_workqueue("target_completion",
153 WQ_MEM_RECLAIM, 0);
154 if (!target_completion_wq)
229d4f11 155 goto out_free_lba_map_mem_cache;
35e0e757 156
c66ac9db 157 return 0;
35e0e757 158
229d4f11
HR		 159out_free_lba_map_mem_cache:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
161out_free_lba_map_cache:
162 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 163out_free_tg_pt_gp_mem_cache:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
165out_free_tg_pt_gp_cache:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167out_free_lu_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169out_free_lu_gp_cache:
170 kmem_cache_destroy(t10_alua_lu_gp_cache);
171out_free_pr_reg_cache:
172 kmem_cache_destroy(t10_pr_reg_cache);
173out_free_ua_cache:
174 kmem_cache_destroy(se_ua_cache);
175out_free_sess_cache:
176 kmem_cache_destroy(se_sess_cache);
c66ac9db 177out:
e3d6f909 178 return -ENOMEM;
c66ac9db
NB		 179}
180
e3d6f909 181void release_se_kmem_caches(void)
c66ac9db 182{
35e0e757 183 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 184 kmem_cache_destroy(se_sess_cache);
185 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 186 kmem_cache_destroy(t10_pr_reg_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_cache);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
229d4f11
HR		 191 kmem_cache_destroy(t10_alua_lba_map_cache);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 193}
194
e3d6f909
AG		 195/* This code ensures unique mib indexes are handed out. */
196static DEFINE_SPINLOCK(scsi_mib_index_lock);
197static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 198
199/*
200 * Allocate a new row index for the entry type specified
201 */
202u32 scsi_get_new_index(scsi_index_t type)
203{
204 u32 new_index;
205
e3d6f909 206 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 207
e3d6f909
AG		 208 spin_lock(&scsi_mib_index_lock);
209 new_index = ++scsi_mib_index[type];
210 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 211
212 return new_index;
213}
214
dbc5623e 215void transport_subsystem_check_init(void)
c66ac9db
NB		 216{
217 int ret;
283669d2 218 static int sub_api_initialized;
c66ac9db 219
dbc5623e
NB		 220 if (sub_api_initialized)
221 return;
222
c66ac9db
NB		 223 ret = request_module("target_core_iblock");
224 if (ret != 0)
6708bb27 225 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 226
227 ret = request_module("target_core_file");
228 if (ret != 0)
6708bb27 229 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 230
231 ret = request_module("target_core_pscsi");
232 if (ret != 0)
6708bb27 233 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 234
7c9e7a6f
AG		 235 ret = request_module("target_core_user");
236 if (ret != 0)
237 pr_err("Unable to load target_core_user\n");
238
e3d6f909 239 sub_api_initialized = 1;
c66ac9db
NB		 240}
241
e70beee7 242struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 243{
244 struct se_session *se_sess;
245
246 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 247 if (!se_sess) {
248 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 249 " se_sess_cache\n");
250 return ERR_PTR(-ENOMEM);
251 }
252 INIT_LIST_HEAD(&se_sess->sess_list);
253 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 254 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 255 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 256 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 257 kref_init(&se_sess->sess_kref);
e70beee7 258 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 259
260 return se_sess;
261}
262EXPORT_SYMBOL(transport_init_session);
263
c0add7fd
NB		 264int transport_alloc_session_tags(struct se_session *se_sess,
265 unsigned int tag_num, unsigned int tag_size)
266{
267 int rc;
268
8c7f6e9b
NB		 269 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
270 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 271 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 272 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
273 if (!se_sess->sess_cmd_map) {
274 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
275 return -ENOMEM;
276 }
c0add7fd
NB		 277 }
278
279 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
280 if (rc < 0) {
281 pr_err("Unable to init se_sess->sess_tag_pool,"
282 " tag_num: %u\n", tag_num);
8c7f6e9b
NB		 283 if (is_vmalloc_addr(se_sess->sess_cmd_map))
284 vfree(se_sess->sess_cmd_map);
285 else
286 kfree(se_sess->sess_cmd_map);
c0add7fd
NB		 287 se_sess->sess_cmd_map = NULL;
288 return -ENOMEM;
289 }
290
291 return 0;
292}
293EXPORT_SYMBOL(transport_alloc_session_tags);
294
295struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 296 unsigned int tag_size,
297 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 298{
299 struct se_session *se_sess;
300 int rc;
301
e70beee7 302 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 303 if (IS_ERR(se_sess))
304 return se_sess;
305
306 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
307 if (rc < 0) {
308 transport_free_session(se_sess);
309 return ERR_PTR(-ENOMEM);
310 }
311
312 return se_sess;
313}
314EXPORT_SYMBOL(transport_init_session_tags);
315
c66ac9db 316/*
140854cb 317 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 318 */
319void __transport_register_session(
320 struct se_portal_group *se_tpg,
321 struct se_node_acl *se_nacl,
322 struct se_session *se_sess,
323 void *fabric_sess_ptr)
324{
9ac8928e 325 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 326 unsigned char buf[PR_REG_ISID_LEN];
327
328 se_sess->se_tpg = se_tpg;
329 se_sess->fabric_sess_ptr = fabric_sess_ptr;
330 /*
331 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
332 *
333 * Only set for struct se_session's that will actually be moving I/O.
334 * eg: *NOT* discovery sessions.
335 */
336 if (se_nacl) {
bffb5128
NB		 337 /*
338 *
339 * Determine if fabric allows for T10-PI feature bits exposed to
340 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
341 *
342 * If so, then always save prot_type on a per se_node_acl node
343 * basis and re-instate the previous sess_prot_type to avoid
344 * disabling PI from below any previously initiator side
345 * registered LUNs.
346 */
347 if (se_nacl->saved_prot_type)
348 se_sess->sess_prot_type = se_nacl->saved_prot_type;
349 else if (tfo->tpg_check_prot_fabric_only)
350 se_sess->sess_prot_type = se_nacl->saved_prot_type =
351 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 352 /*
353 * If the fabric module supports an ISID based TransportID,
354 * save this value in binary from the fabric I_T Nexus now.
355 */
e3d6f909 356 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 357 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 358 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 359 &buf[0], PR_REG_ISID_LEN);
360 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
361 }
afb999ff
NB		 362 kref_get(&se_nacl->acl_kref);
363
c66ac9db
NB		 364 spin_lock_irq(&se_nacl->nacl_sess_lock);
365 /*
366 * The se_nacl->nacl_sess pointer will be set to the
367 * last active I_T Nexus for each struct se_node_acl.
368 */
369 se_nacl->nacl_sess = se_sess;
370
371 list_add_tail(&se_sess->sess_acl_list,
372 &se_nacl->acl_sess_list);
373 spin_unlock_irq(&se_nacl->nacl_sess_lock);
374 }
375 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
376
6708bb27 377 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 378 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 379}
380EXPORT_SYMBOL(__transport_register_session);
381
382void transport_register_session(
383 struct se_portal_group *se_tpg,
384 struct se_node_acl *se_nacl,
385 struct se_session *se_sess,
386 void *fabric_sess_ptr)
387{
140854cb
NB		 388 unsigned long flags;
389
390 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 391 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 392 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 393}
394EXPORT_SYMBOL(transport_register_session);
395
ecf0dd66 396static void target_release_session(struct kref *kref)
41ac82b6
NB		 397{
398 struct se_session *se_sess = container_of(kref,
399 struct se_session, sess_kref);
400 struct se_portal_group *se_tpg = se_sess->se_tpg;
401
402 se_tpg->se_tpg_tfo->close_session(se_sess);
403}
404
405void target_get_session(struct se_session *se_sess)
406{
407 kref_get(&se_sess->sess_kref);
408}
409EXPORT_SYMBOL(target_get_session);
410
33933a0e 411void target_put_session(struct se_session *se_sess)
41ac82b6 412{
4149268e
JE		 413 struct se_portal_group *tpg = se_sess->se_tpg;
414
415 if (tpg->se_tpg_tfo->put_session != NULL) {
416 tpg->se_tpg_tfo->put_session(se_sess);
417 return;
418 }
33933a0e 419 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 420}
421EXPORT_SYMBOL(target_put_session);
422
f8e471f9
NB		 423ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
424{
425 struct se_session *se_sess;
426 ssize_t len = 0;
427
428 spin_lock_bh(&se_tpg->session_lock);
429 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
430 if (!se_sess->se_node_acl)
431 continue;
432 if (!se_sess->se_node_acl->dynamic_node_acl)
433 continue;
434 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
435 break;
436
437 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
438 se_sess->se_node_acl->initiatorname);
439 len += 1; /* Include NULL terminator */
440 }
441 spin_unlock_bh(&se_tpg->session_lock);
442
443 return len;
444}
445EXPORT_SYMBOL(target_show_dynamic_sessions);
446
afb999ff
NB		 447static void target_complete_nacl(struct kref *kref)
448{
449 struct se_node_acl *nacl = container_of(kref,
450 struct se_node_acl, acl_kref);
451
452 complete(&nacl->acl_free_comp);
453}
454
455void target_put_nacl(struct se_node_acl *nacl)
456{
457 kref_put(&nacl->acl_kref, target_complete_nacl);
458}
459
c66ac9db
NB		 460void transport_deregister_session_configfs(struct se_session *se_sess)
461{
462 struct se_node_acl *se_nacl;
23388864 463 unsigned long flags;
c66ac9db
NB		 464 /*
465 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
466 */
467 se_nacl = se_sess->se_node_acl;
6708bb27 468 if (se_nacl) {
23388864 469 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 470 if (se_nacl->acl_stop == 0)
471 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 472 /*
473 * If the session list is empty, then clear the pointer.
474 * Otherwise, set the struct se_session pointer from the tail
475 * element of the per struct se_node_acl active session list.
476 */
477 if (list_empty(&se_nacl->acl_sess_list))
478 se_nacl->nacl_sess = NULL;
479 else {
480 se_nacl->nacl_sess = container_of(
481 se_nacl->acl_sess_list.prev,
482 struct se_session, sess_acl_list);
483 }
23388864 484 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 485 }
486}
487EXPORT_SYMBOL(transport_deregister_session_configfs);
488
489void transport_free_session(struct se_session *se_sess)
490{
c0add7fd
NB		 491 if (se_sess->sess_cmd_map) {
492 percpu_ida_destroy(&se_sess->sess_tag_pool);
8c7f6e9b
NB		 493 if (is_vmalloc_addr(se_sess->sess_cmd_map))
494 vfree(se_sess->sess_cmd_map);
495 else
496 kfree(se_sess->sess_cmd_map);
c0add7fd 497 }
c66ac9db
NB		 498 kmem_cache_free(se_sess_cache, se_sess);
499}
500EXPORT_SYMBOL(transport_free_session);
501
502void transport_deregister_session(struct se_session *se_sess)
503{
504 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 505 const struct target_core_fabric_ops *se_tfo;
c66ac9db 506 struct se_node_acl *se_nacl;
e63a8e19 507 unsigned long flags;
01468346 508 bool comp_nacl = true;
c66ac9db 509
6708bb27 510 if (!se_tpg) {
c66ac9db
NB		 511 transport_free_session(se_sess);
512 return;
513 }
01468346 514 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 515
e63a8e19 516 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 517 list_del(&se_sess->sess_list);
518 se_sess->se_tpg = NULL;
519 se_sess->fabric_sess_ptr = NULL;
e63a8e19 520 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 521
522 /*
523 * Determine if we need to do extra work for this initiator node's
524 * struct se_node_acl if it had been previously dynamically generated.
525 */
526 se_nacl = se_sess->se_node_acl;
01468346
NB		 527
528 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
529 if (se_nacl && se_nacl->dynamic_node_acl) {
530 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
531 list_del(&se_nacl->acl_list);
532 se_tpg->num_node_acls--;
533 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
534 core_tpg_wait_for_nacl_pr_ref(se_nacl);
535 core_free_device_list_for_node(se_nacl, se_tpg);
144bc4c2 536 kfree(se_nacl);
01468346
NB		 537
538 comp_nacl = false;
539 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 540 }
c66ac9db 541 }
01468346 542 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 543
6708bb27 544 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 545 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 546 /*
125d0119 547 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 548 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
549 * removal context.
01468346 550 */
0bcc297e 551 if (se_nacl && comp_nacl)
afb999ff 552 target_put_nacl(se_nacl);
01468346 553
afb999ff 554 transport_free_session(se_sess);
c66ac9db
NB		 555}
556EXPORT_SYMBOL(transport_deregister_session);
557
558/*
a1d8b49a 559 * Called with cmd->t_state_lock held.
c66ac9db 560 */
cf572a96 561static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 562{
42bf829e 563 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 564 unsigned long flags;
565
42bf829e
CH		 566 if (!dev)
567 return;
c66ac9db 568
cf572a96
CH		 569 if (cmd->transport_state & CMD_T_BUSY)
570 return;
c66ac9db 571
cf572a96
CH		 572 spin_lock_irqsave(&dev->execute_task_lock, flags);
573 if (cmd->state_active) {
574 list_del(&cmd->state_list);
cf572a96 575 cmd->state_active = false;
c66ac9db 576 }
cf572a96 577 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 578}
579
862e6389
NB		 580static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
581 bool write_pending)
c66ac9db
NB		 582{
583 unsigned long flags;
584
a1d8b49a 585 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 586 if (write_pending)
587 cmd->t_state = TRANSPORT_WRITE_PENDING;
588
f7113a47
CH		 589 if (remove_from_lists) {
590 target_remove_from_state_list(cmd);
591
592 /*
593 * Clear struct se_cmd->se_lun before the handoff to FE.
594 */
595 cmd->se_lun = NULL;
596 }
597
c66ac9db
NB		 598 /*
599 * Determine if frontend context caller is requesting the stopping of
e3d6f909 600 * this command for frontend exceptions.
c66ac9db 601 */
7d680f3b 602 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 603 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
604 __func__, __LINE__, cmd->tag);
c66ac9db 605
a1d8b49a 606 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 607
a95d6511 608 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 609 return 1;
610 }
f7113a47
CH		 611
612 cmd->transport_state &= ~CMD_T_ACTIVE;
613 if (remove_from_lists) {
614 /*
615 * Some fabric modules like tcm_loop can release
616 * their internally allocated I/O reference now and
617 * struct se_cmd now.
618 *
619 * Fabric modules are expected to return '1' here if the
620 * se_cmd being passed is released at this point,
621 * or zero if not being released.
622 */
623 if (cmd->se_tfo->check_stop_free != NULL) {
624 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
625 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 626 }
f7113a47 627 }
c66ac9db 628
a1d8b49a 629 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 630 return 0;
631}
632
633static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
634{
862e6389 635 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 636}
637
638static void transport_lun_remove_cmd(struct se_cmd *cmd)
639{
e3d6f909 640 struct se_lun *lun = cmd->se_lun;
c66ac9db 641
5259a06e 642 if (!lun)
c66ac9db
NB		 643 return;
644
5259a06e
NB		 645 if (cmpxchg(&cmd->lun_ref_active, true, false))
646 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 647}
648
649void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
650{
68259b5a
AL		 651 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
652 transport_lun_remove_cmd(cmd);
131e6abc
NB		 653 /*
654 * Allow the fabric driver to unmap any resources before
655 * releasing the descriptor via TFO->release_cmd()
656 */
657 if (remove)
658 cmd->se_tfo->aborted_task(cmd);
68259b5a 659
c66ac9db
NB		 660 if (transport_cmd_check_stop_to_fabric(cmd))
661 return;
af877292 662 if (remove)
e6a2573f 663 transport_put_cmd(cmd);
c66ac9db
NB		 664}
665
35e0e757
CH		 666static void target_complete_failure_work(struct work_struct *work)
667{
668 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
669
de103c93
CH		 670 transport_generic_request_failure(cmd,
671 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 672}
673
6138ed2a 674/*
d5829eac
PB		 675 * Used when asking transport to copy Sense Data from the underlying
676 * Linux/SCSI struct scsi_cmnd
6138ed2a 677 */
d5829eac 678static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 679{
6138ed2a 680 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 681
682 WARN_ON(!cmd->se_lun);
683
684 if (!dev)
d5829eac 685 return NULL;
6138ed2a 686
d5829eac
PB		 687 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
688 return NULL;
6138ed2a 689
9c58b7dd 690 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 691
d5829eac 692 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 693 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 694 return cmd->sense_buffer;
6138ed2a
PB		 695}
696
5787cacd 697void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 698{
42bf829e 699 struct se_device *dev = cmd->se_dev;
5787cacd 700 int success = scsi_status == GOOD;
c66ac9db 701 unsigned long flags;
c66ac9db 702
5787cacd
CH		 703 cmd->scsi_status = scsi_status;
704
705
a1d8b49a 706 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 707 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 708
c66ac9db 709 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 710 dev->transport->transport_complete(cmd,
711 cmd->t_data_sg,
712 transport_get_sense_buffer(cmd));
713 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 714 success = 1;
c66ac9db
NB		 715 }
716
717 /*
5787cacd 718 * See if we are waiting to complete for an exception condition.
c66ac9db 719 */
cf572a96 720 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 721 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 722 complete(&cmd->task_stop_comp);
c66ac9db
NB		 723 return;
724 }
2235007c 725
3d28934a 726 /*
125d0119 727 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 728 * and transport_wait_for_tasks() will be waiting for completion..
729 */
730 if (cmd->transport_state & CMD_T_ABORTED &&
731 cmd->transport_state & CMD_T_STOP) {
732 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 733 complete_all(&cmd->t_transport_stop_comp);
3d28934a 734 return;
3dca1471 735 } else if (!success) {
35e0e757 736 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 737 } else {
35e0e757 738 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 739 }
35e0e757 740
35e0e757 741 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 742 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 743 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 744
35e0e757 745 queue_work(target_completion_wq, &cmd->work);
c66ac9db 746}
6bb35e00
CH		 747EXPORT_SYMBOL(target_complete_cmd);
748
2426bd45
RD		 749void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
750{
751 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
752 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
753 cmd->residual_count += cmd->data_length - length;
754 } else {
755 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
756 cmd->residual_count = cmd->data_length - length;
757 }
758
759 cmd->data_length = length;
760 }
761
762 target_complete_cmd(cmd, scsi_status);
763}
764EXPORT_SYMBOL(target_complete_cmd_with_length);
765
cf572a96 766static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 767{
cf572a96
CH		 768 struct se_device *dev = cmd->se_dev;
769 unsigned long flags;
c66ac9db 770
cf572a96
CH		 771 spin_lock_irqsave(&dev->execute_task_lock, flags);
772 if (!cmd->state_active) {
773 list_add_tail(&cmd->state_list, &dev->state_list);
774 cmd->state_active = true;
c66ac9db 775 }
cf572a96 776 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 777}
778
07bde79a 779/*
f147abb4 780 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 781 */
7a6f0a1e
CH		 782static void transport_write_pending_qf(struct se_cmd *cmd);
783static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 784
0fd97ccf 785void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 786{
787 struct se_device *dev = container_of(work, struct se_device,
788 qf_work_queue);
bcac364a 789 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 790 struct se_cmd *cmd, *cmd_tmp;
791
792 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 793 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
794 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 795
bcac364a 796 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 797 list_del(&cmd->se_qf_node);
33940d09 798 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 799
6708bb27 800 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 801 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 802 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 803 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
804 : "UNKNOWN");
f7a5cc0b 805
7a6f0a1e
CH		 806 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
807 transport_write_pending_qf(cmd);
808 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
809 transport_complete_qf(cmd);
07bde79a 810 }
07bde79a
NB		 811}
812
c66ac9db
NB		 813unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
814{
815 switch (cmd->data_direction) {
816 case DMA_NONE:
817 return "NONE";
818 case DMA_FROM_DEVICE:
819 return "READ";
820 case DMA_TO_DEVICE:
821 return "WRITE";
822 case DMA_BIDIRECTIONAL:
823 return "BIDI";
824 default:
825 break;
826 }
827
828 return "UNKNOWN";
829}
830
831void transport_dump_dev_state(
832 struct se_device *dev,
833 char *b,
834 int *bl)
835{
836 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 837 if (dev->export_count)
c66ac9db 838 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 839 else
c66ac9db 840 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 841
5f41a31d 842 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 843 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 844 dev->dev_attrib.block_size,
845 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 846 *bl += sprintf(b + *bl, " ");
847}
848
c66ac9db
NB		 849void transport_dump_vpd_proto_id(
850 struct t10_vpd *vpd,
851 unsigned char *p_buf,
852 int p_buf_len)
853{
854 unsigned char buf[VPD_TMP_BUF_SIZE];
855 int len;
856
857 memset(buf, 0, VPD_TMP_BUF_SIZE);
858 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
859
860 switch (vpd->protocol_identifier) {
861 case 0x00:
862 sprintf(buf+len, "Fibre Channel\n");
863 break;
864 case 0x10:
865 sprintf(buf+len, "Parallel SCSI\n");
866 break;
867 case 0x20:
868 sprintf(buf+len, "SSA\n");
869 break;
870 case 0x30:
871 sprintf(buf+len, "IEEE 1394\n");
872 break;
873 case 0x40:
874 sprintf(buf+len, "SCSI Remote Direct Memory Access"
875 " Protocol\n");
876 break;
877 case 0x50:
878 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
879 break;
880 case 0x60:
881 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
882 break;
883 case 0x70:
884 sprintf(buf+len, "Automation/Drive Interface Transport"
885 " Protocol\n");
886 break;
887 case 0x80:
888 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
889 break;
890 default:
891 sprintf(buf+len, "Unknown 0x%02x\n",
892 vpd->protocol_identifier);
893 break;
894 }
895
896 if (p_buf)
897 strncpy(p_buf, buf, p_buf_len);
898 else
6708bb27 899 pr_debug("%s", buf);
c66ac9db
NB		 900}
901
902void
903transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
904{
905 /*
906 * Check if the Protocol Identifier Valid (PIV) bit is set..
907 *
908 * from spc3r23.pdf section 7.5.1
909 */
910 if (page_83[1] & 0x80) {
911 vpd->protocol_identifier = (page_83[0] & 0xf0);
912 vpd->protocol_identifier_set = 1;
913 transport_dump_vpd_proto_id(vpd, NULL, 0);
914 }
915}
916EXPORT_SYMBOL(transport_set_vpd_proto_id);
917
918int transport_dump_vpd_assoc(
919 struct t10_vpd *vpd,
920 unsigned char *p_buf,
921 int p_buf_len)
922{
923 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 924 int ret = 0;
925 int len;
c66ac9db
NB		 926
927 memset(buf, 0, VPD_TMP_BUF_SIZE);
928 len = sprintf(buf, "T10 VPD Identifier Association: ");
929
930 switch (vpd->association) {
931 case 0x00:
932 sprintf(buf+len, "addressed logical unit\n");
933 break;
934 case 0x10:
935 sprintf(buf+len, "target port\n");
936 break;
937 case 0x20:
938 sprintf(buf+len, "SCSI target device\n");
939 break;
940 default:
941 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 942 ret = -EINVAL;
c66ac9db
NB		 943 break;
944 }
945
946 if (p_buf)
947 strncpy(p_buf, buf, p_buf_len);
948 else
6708bb27 949 pr_debug("%s", buf);
c66ac9db
NB		 950
951 return ret;
952}
953
954int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
955{
956 /*
957 * The VPD identification association..
958 *
959 * from spc3r23.pdf Section 7.6.3.1 Table 297
960 */
961 vpd->association = (page_83[1] & 0x30);
962 return transport_dump_vpd_assoc(vpd, NULL, 0);
963}
964EXPORT_SYMBOL(transport_set_vpd_assoc);
965
966int transport_dump_vpd_ident_type(
967 struct t10_vpd *vpd,
968 unsigned char *p_buf,
969 int p_buf_len)
970{
971 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 972 int ret = 0;
973 int len;
c66ac9db
NB		 974
975 memset(buf, 0, VPD_TMP_BUF_SIZE);
976 len = sprintf(buf, "T10 VPD Identifier Type: ");
977
978 switch (vpd->device_identifier_type) {
979 case 0x00:
980 sprintf(buf+len, "Vendor specific\n");
981 break;
982 case 0x01:
983 sprintf(buf+len, "T10 Vendor ID based\n");
984 break;
985 case 0x02:
986 sprintf(buf+len, "EUI-64 based\n");
987 break;
988 case 0x03:
989 sprintf(buf+len, "NAA\n");
990 break;
991 case 0x04:
992 sprintf(buf+len, "Relative target port identifier\n");
993 break;
994 case 0x08:
995 sprintf(buf+len, "SCSI name string\n");
996 break;
997 default:
998 sprintf(buf+len, "Unsupported: 0x%02x\n",
999 vpd->device_identifier_type);
e3d6f909 1000 ret = -EINVAL;
c66ac9db
NB		 1001 break;
1002 }
1003
e3d6f909
AG		 1004 if (p_buf) {
1005 if (p_buf_len < strlen(buf)+1)
1006 return -EINVAL;
c66ac9db 1007 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1008 } else {
6708bb27 1009 pr_debug("%s", buf);
e3d6f909 1010 }
c66ac9db
NB		 1011
1012 return ret;
1013}
1014
1015int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1016{
1017 /*
1018 * The VPD identifier type..
1019 *
1020 * from spc3r23.pdf Section 7.6.3.1 Table 298
1021 */
1022 vpd->device_identifier_type = (page_83[1] & 0x0f);
1023 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1024}
1025EXPORT_SYMBOL(transport_set_vpd_ident_type);
1026
1027int transport_dump_vpd_ident(
1028 struct t10_vpd *vpd,
1029 unsigned char *p_buf,
1030 int p_buf_len)
1031{
1032 unsigned char buf[VPD_TMP_BUF_SIZE];
1033 int ret = 0;
1034
1035 memset(buf, 0, VPD_TMP_BUF_SIZE);
1036
1037 switch (vpd->device_identifier_code_set) {
1038 case 0x01: /* Binary */
703d641d
DC		 1039 snprintf(buf, sizeof(buf),
1040 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1041 &vpd->device_identifier[0]);
1042 break;
1043 case 0x02: /* ASCII */
703d641d
DC		 1044 snprintf(buf, sizeof(buf),
1045 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1046 &vpd->device_identifier[0]);
1047 break;
1048 case 0x03: /* UTF-8 */
703d641d
DC		 1049 snprintf(buf, sizeof(buf),
1050 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1051 &vpd->device_identifier[0]);
1052 break;
1053 default:
1054 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1055 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1056 ret = -EINVAL;
c66ac9db
NB		 1057 break;
1058 }
1059
1060 if (p_buf)
1061 strncpy(p_buf, buf, p_buf_len);
1062 else
6708bb27 1063 pr_debug("%s", buf);
c66ac9db
NB		 1064
1065 return ret;
1066}
1067
1068int
1069transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1070{
1071 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1072 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1073
1074 /*
1075 * The VPD Code Set (encoding)
1076 *
1077 * from spc3r23.pdf Section 7.6.3.1 Table 296
1078 */
1079 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1080 switch (vpd->device_identifier_code_set) {
1081 case 0x01: /* Binary */
1082 vpd->device_identifier[j++] =
1083 hex_str[vpd->device_identifier_type];
1084 while (i < (4 + page_83[3])) {
1085 vpd->device_identifier[j++] =
1086 hex_str[(page_83[i] & 0xf0) >> 4];
1087 vpd->device_identifier[j++] =
1088 hex_str[page_83[i] & 0x0f];
1089 i++;
1090 }
1091 break;
1092 case 0x02: /* ASCII */
1093 case 0x03: /* UTF-8 */
1094 while (i < (4 + page_83[3]))
1095 vpd->device_identifier[j++] = page_83[i++];
1096 break;
1097 default:
1098 break;
1099 }
1100
1101 return transport_dump_vpd_ident(vpd, NULL, 0);
1102}
1103EXPORT_SYMBOL(transport_set_vpd_ident);
1104
de103c93
CH		 1105sense_reason_t
1106target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1107{
1108 struct se_device *dev = cmd->se_dev;
1109
1110 if (cmd->unknown_data_length) {
1111 cmd->data_length = size;
1112 } else if (size != cmd->data_length) {
1113 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1114 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1115 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1116 cmd->data_length, size, cmd->t_task_cdb[0]);
1117
9b3b8041
CH		 1118 if (cmd->data_direction == DMA_TO_DEVICE) {
1119 pr_err("Rejecting underflow/overflow"
1120 " WRITE data\n");
de103c93 1121 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1122 }
1123 /*
1124 * Reject READ_* or WRITE_* with overflow/underflow for
1125 * type SCF_SCSI_DATA_CDB.
1126 */
0fd97ccf 1127 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1128 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1129 " CDB on non 512-byte sector setup subsystem"
1130 " plugin: %s\n", dev->transport->name);
1131 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1132 return TCM_INVALID_CDB_FIELD;
9b3b8041 1133 }
4c054ba6
NB		 1134 /*
1135 * For the overflow case keep the existing fabric provided
1136 * ->data_length. Otherwise for the underflow case, reset
1137 * ->data_length to the smaller SCSI expected data transfer
1138 * length.
1139 */
9b3b8041
CH		 1140 if (size > cmd->data_length) {
1141 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1142 cmd->residual_count = (size - cmd->data_length);
1143 } else {
1144 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1145 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1146 cmd->data_length = size;
9b3b8041 1147 }
9b3b8041
CH		 1148 }
1149
1150 return 0;
1151
9b3b8041
CH		 1152}
1153
c66ac9db
NB		 1154/*
1155 * Used by fabric modules containing a local struct se_cmd within their
1156 * fabric dependent per I/O descriptor.
649ee054
BVA		 1157 *
1158 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1159 */
1160void transport_init_se_cmd(
1161 struct se_cmd *cmd,
9ac8928e 1162 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1163 struct se_session *se_sess,
1164 u32 data_length,
1165 int data_direction,
1166 int task_attr,
1167 unsigned char *sense_buffer)
1168{
5951146d 1169 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1170 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1171 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1172 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1173 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1174 init_completion(&cmd->cmd_wait_comp);
cf572a96 1175 init_completion(&cmd->task_stop_comp);
a1d8b49a 1176 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1177 kref_init(&cmd->cmd_kref);
7d680f3b 1178 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1179
1180 cmd->se_tfo = tfo;
1181 cmd->se_sess = se_sess;
1182 cmd->data_length = data_length;
1183 cmd->data_direction = data_direction;
1184 cmd->sam_task_attr = task_attr;
1185 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1186
1187 cmd->state_active = false;
c66ac9db
NB		 1188}
1189EXPORT_SYMBOL(transport_init_se_cmd);
1190
de103c93
CH		 1191static sense_reason_t
1192transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1193{
019c4ca6
CH		 1194 struct se_device *dev = cmd->se_dev;
1195
c66ac9db
NB		 1196 /*
1197 * Check if SAM Task Attribute emulation is enabled for this
1198 * struct se_device storage object
1199 */
a3541703 1200 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1201 return 0;
1202
68d81f40 1203 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1204 pr_debug("SAM Task Attribute ACA"
c66ac9db 1205 " emulation is not supported\n");
de103c93 1206 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1207 }
1208 /*
1209 * Used to determine when ORDERED commands should go from
1210 * Dormant to Active status.
1211 */
019c4ca6 1212 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
6708bb27 1213 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1214 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1215 dev->transport->name);
c66ac9db
NB		 1216 return 0;
1217}
1218
de103c93
CH		 1219sense_reason_t
1220target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1221{
0fd97ccf 1222 struct se_device *dev = cmd->se_dev;
de103c93 1223 sense_reason_t ret;
c66ac9db 1224
c66ac9db
NB		 1225 /*
1226 * Ensure that the received CDB is less than the max (252 + 8) bytes
1227 * for VARIABLE_LENGTH_CMD
1228 */
1229 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1230 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1231 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1232 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1233 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1234 }
1235 /*
1236 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1237 * allocate the additional extended CDB buffer now.. Otherwise
1238 * setup the pointer from __t_task_cdb to t_task_cdb.
1239 */
a1d8b49a
AG		 1240 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1241 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1242 GFP_KERNEL);
6708bb27
AG		 1243 if (!cmd->t_task_cdb) {
1244 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1245 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1246 scsi_command_size(cdb),
a1d8b49a 1247 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1248 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1249 }
1250 } else
a1d8b49a 1251 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1252 /*
a1d8b49a 1253 * Copy the original CDB into cmd->
c66ac9db 1254 */
a1d8b49a 1255 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1256
e5c0d6ad
RD		 1257 trace_target_sequencer_start(cmd);
1258
cb4f4d3c
CH		 1259 /*
1260 * Check for an existing UNIT ATTENTION condition
1261 */
de103c93
CH		 1262 ret = target_scsi3_ua_check(cmd);
1263 if (ret)
1264 return ret;
cb4f4d3c 1265
c87fbd56 1266 ret = target_alua_state_check(cmd);
de103c93
CH		 1267 if (ret)
1268 return ret;
cb4f4d3c 1269
d977f437 1270 ret = target_check_reservation(cmd);
f85eda8d
NB		 1271 if (ret) {
1272 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1273 return ret;
f85eda8d 1274 }
cb4f4d3c 1275
0fd97ccf 1276 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1277 if (ret)
1278 return ret;
1279
1280 ret = transport_check_alloc_task_attr(cmd);
1281 if (ret)
c66ac9db 1282 return ret;
cb4f4d3c 1283
cb4f4d3c 1284 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1285
c66ac9db
NB		 1286 spin_lock(&cmd->se_lun->lun_sep_lock);
1287 if (cmd->se_lun->lun_sep)
1288 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1289 spin_unlock(&cmd->se_lun->lun_sep_lock);
1290 return 0;
1291}
a12f41f8 1292EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1293
695434e1
NB		 1294/*
1295 * Used by fabric module frontends to queue tasks directly.
1296 * Many only be used from process context only
1297 */
1298int transport_handle_cdb_direct(
1299 struct se_cmd *cmd)
1300{
de103c93 1301 sense_reason_t ret;
dd8ae59d 1302
695434e1
NB		 1303 if (!cmd->se_lun) {
1304 dump_stack();
6708bb27 1305 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1306 return -EINVAL;
1307 }
1308 if (in_interrupt()) {
1309 dump_stack();
6708bb27 1310 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1311 " from interrupt context\n");
1312 return -EINVAL;
1313 }
dd8ae59d 1314 /*
af877292
CH		 1315 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1316 * outstanding descriptors are handled correctly during shutdown via
1317 * transport_wait_for_tasks()
dd8ae59d
NB		 1318 *
1319 * Also, we don't take cmd->t_state_lock here as we only expect
1320 * this to be called for initial descriptor submission.
1321 */
1322 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1323 cmd->transport_state |= CMD_T_ACTIVE;
1324
dd8ae59d
NB		 1325 /*
1326 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1327 * so follow TRANSPORT_NEW_CMD processing thread context usage
1328 * and call transport_generic_request_failure() if necessary..
1329 */
1330 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1331 if (ret)
1332 transport_generic_request_failure(cmd, ret);
dd8ae59d 1333 return 0;
695434e1
NB		 1334}
1335EXPORT_SYMBOL(transport_handle_cdb_direct);
1336
c5ff8d6b 1337sense_reason_t
de103c93
CH		 1338transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1339 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1340{
1341 if (!sgl || !sgl_count)
1342 return 0;
1343
1344 /*
1345 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1346 * scatterlists already have been set to follow what the fabric
1347 * passes for the original expected data transfer length.
1348 */
1349 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1350 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1351 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1352 return TCM_INVALID_CDB_FIELD;
1353 }
1354
1355 cmd->t_data_sg = sgl;
1356 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1357 cmd->t_bidi_data_sg = sgl_bidi;
1358 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1359
de103c93
CH		 1360 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1361 return 0;
1362}
1363
a026757f
NB		 1364/*
1365 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1366 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1367 *
1368 * @se_cmd: command descriptor to submit
1369 * @se_sess: associated se_sess for endpoint
1370 * @cdb: pointer to SCSI CDB
1371 * @sense: pointer to SCSI sense buffer
1372 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1373 * @data_length: fabric expected data transfer length
1374 * @task_addr: SAM task attribute
1375 * @data_dir: DMA data direction
1376 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1377 * @sgl: struct scatterlist memory for unidirectional mapping
1378 * @sgl_count: scatterlist count for unidirectional mapping
1379 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1380 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1381 * @sgl_prot: struct scatterlist memory protection information
1382 * @sgl_prot_count: scatterlist count for protection information
a6360785 1383 *
649ee054
BVA		 1384 * Task tags are supported if the caller has set @se_cmd->tag.
1385 *
d6dfc868
RD		 1386 * Returns non zero to signal active I/O shutdown failure. All other
1387 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1388 * but still return zero here.
1389 *
a6360785
NB		 1390 * This may only be called from process context, and also currently
1391 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1392 */
1393int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1394 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1395 u32 data_length, int task_attr, int data_dir, int flags,
1396 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1397 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1398 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1399{
1400 struct se_portal_group *se_tpg;
de103c93
CH		 1401 sense_reason_t rc;
1402 int ret;
a6360785
NB		 1403
1404 se_tpg = se_sess->se_tpg;
1405 BUG_ON(!se_tpg);
1406 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1407 BUG_ON(in_interrupt());
1408 /*
1409 * Initialize se_cmd for target operation. From this point
1410 * exceptions are handled by sending exception status via
1411 * target_core_fabric_ops->queue_status() callback
1412 */
1413 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1414 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1415 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1416 se_cmd->unknown_data_length = 1;
a6360785
NB		 1417 /*
1418 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1419 * se_sess->sess_cmd_list. A second kref_get here is necessary
1420 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1421 * kref_put() to happen during fabric packet acknowledgement.
1422 */
afc16604 1423 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1424 if (ret)
1425 return ret;
a6360785
NB		 1426 /*
1427 * Signal bidirectional data payloads to target-core
1428 */
1429 if (flags & TARGET_SCF_BIDI_OP)
1430 se_cmd->se_cmd_flags |= SCF_BIDI;
1431 /*
1432 * Locate se_lun pointer and attach it to struct se_cmd
1433 */
de103c93
CH		 1434 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1435 if (rc) {
1436 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1437 target_put_sess_cmd(se_cmd);
d6dfc868 1438 return 0;
735703ca 1439 }
b5b8e298
SG		 1440
1441 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1442 if (rc != 0) {
1443 transport_generic_request_failure(se_cmd, rc);
1444 return 0;
1445 }
1446
def2b339
NB		 1447 /*
1448 * Save pointers for SGLs containing protection information,
1449 * if present.
1450 */
1451 if (sgl_prot_count) {
1452 se_cmd->t_prot_sg = sgl_prot;
1453 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1454 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1455 }
d6e0175c 1456
a026757f
NB		 1457 /*
1458 * When a non zero sgl_count has been passed perform SGL passthrough
1459 * mapping for pre-allocated fabric memory instead of having target
1460 * core perform an internal SGL allocation..
1461 */
1462 if (sgl_count != 0) {
1463 BUG_ON(!sgl);
1464
944981c7
NB		 1465 /*
1466 * A work-around for tcm_loop as some userspace code via
1467 * scsi-generic do not memset their associated read buffers,
1468 * so go ahead and do that here for type non-data CDBs. Also
1469 * note that this is currently guaranteed to be a single SGL
1470 * for this case by target core in target_setup_cmd_from_cdb()
1471 * -> transport_generic_cmd_sequencer().
1472 */
1473 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1474 se_cmd->data_direction == DMA_FROM_DEVICE) {
1475 unsigned char *buf = NULL;
1476
1477 if (sgl)
1478 buf = kmap(sg_page(sgl)) + sgl->offset;
1479
1480 if (buf) {
1481 memset(buf, 0, sgl->length);
1482 kunmap(sg_page(sgl));
1483 }
1484 }
1485
a026757f
NB		 1486 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1487 sgl_bidi, sgl_bidi_count);
1488 if (rc != 0) {
de103c93 1489 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1490 return 0;
1491 }
1492 }
def2b339 1493
11e319ed
AG		 1494 /*
1495 * Check if we need to delay processing because of ALUA
1496 * Active/NonOptimized primary access state..
1497 */
1498 core_alua_check_nonop_delay(se_cmd);
1499
a6360785 1500 transport_handle_cdb_direct(se_cmd);
d6dfc868 1501 return 0;
a6360785 1502}
a026757f
NB		 1503EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1504
1505/*
1506 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1507 *
1508 * @se_cmd: command descriptor to submit
1509 * @se_sess: associated se_sess for endpoint
1510 * @cdb: pointer to SCSI CDB
1511 * @sense: pointer to SCSI sense buffer
1512 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1513 * @data_length: fabric expected data transfer length
1514 * @task_addr: SAM task attribute
1515 * @data_dir: DMA data direction
1516 * @flags: flags for command submission from target_sc_flags_tables
1517 *
649ee054
BVA		 1518 * Task tags are supported if the caller has set @se_cmd->tag.
1519 *
a026757f
NB		 1520 * Returns non zero to signal active I/O shutdown failure. All other
1521 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1522 * but still return zero here.
1523 *
1524 * This may only be called from process context, and also currently
1525 * assumes internal allocation of fabric payload buffer by target-core.
1526 *
1527 * It also assumes interal target core SGL memory allocation.
1528 */
1529int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1530 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1531 u32 data_length, int task_attr, int data_dir, int flags)
1532{
1533 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1534 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1535 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1536}
a6360785
NB		 1537EXPORT_SYMBOL(target_submit_cmd);
1538
9f0d05c2
NB		 1539static void target_complete_tmr_failure(struct work_struct *work)
1540{
1541 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1542
1543 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1544 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1545
1546 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1547}
1548
ea98d7f9
AG		 1549/**
1550 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1551 * for TMR CDBs
1552 *
1553 * @se_cmd: command descriptor to submit
1554 * @se_sess: associated se_sess for endpoint
1555 * @sense: pointer to SCSI sense buffer
1556 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1557 * @fabric_context: fabric context for TMR req
1558 * @tm_type: Type of TM request
c0974f89
NB		 1559 * @gfp: gfp type for caller
1560 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1561 * @flags: submit cmd flags
ea98d7f9
AG		 1562 *
1563 * Callable from all contexts.
1564 **/
1565
c7042cae 1566int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1567 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1568 void *fabric_tmr_ptr, unsigned char tm_type,
1569 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1570{
1571 struct se_portal_group *se_tpg;
1572 int ret;
1573
1574 se_tpg = se_sess->se_tpg;
1575 BUG_ON(!se_tpg);
1576
1577 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1578 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1579 /*
1580 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1581 * allocation failure.
1582 */
c0974f89 1583 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1584 if (ret < 0)
1585 return -ENOMEM;
ea98d7f9 1586
c0974f89
NB		 1587 if (tm_type == TMR_ABORT_TASK)
1588 se_cmd->se_tmr_req->ref_task_tag = tag;
1589
ea98d7f9 1590 /* See target_submit_cmd for commentary */
afc16604 1591 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1592 if (ret) {
1593 core_tmr_release_req(se_cmd->se_tmr_req);
1594 return ret;
1595 }
ea98d7f9 1596
ea98d7f9
AG		 1597 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1598 if (ret) {
9f0d05c2
NB		 1599 /*
1600 * For callback during failure handling, push this work off
1601 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1602 */
1603 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1604 schedule_work(&se_cmd->work);
c7042cae 1605 return 0;
ea98d7f9
AG		 1606 }
1607 transport_generic_handle_tmr(se_cmd);
c7042cae 1608 return 0;
ea98d7f9
AG		 1609}
1610EXPORT_SYMBOL(target_submit_tmr);
1611
cdbb70bb 1612/*
cf572a96 1613 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1614 * has completed.
1615 */
cf572a96 1616bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cb0df4d3
BVA		 1617 __releases(&cmd->t_state_lock)
1618 __acquires(&cmd->t_state_lock)
cdbb70bb 1619{
cdbb70bb
CH		 1620 bool was_active = false;
1621
cf572a96
CH		 1622 if (cmd->transport_state & CMD_T_BUSY) {
1623 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1624 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1625
cf572a96
CH		 1626 pr_debug("cmd %p waiting to complete\n", cmd);
1627 wait_for_completion(&cmd->task_stop_comp);
1628 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1629
1630 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1631 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1632 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1633 was_active = true;
1634 }
1635
cdbb70bb
CH		 1636 return was_active;
1637}
1638
c66ac9db
NB		 1639/*
1640 * Handle SAM-esque emulation for generic transport request failures.
1641 */
de103c93
CH		 1642void transport_generic_request_failure(struct se_cmd *cmd,
1643 sense_reason_t sense_reason)
c66ac9db 1644{
07bde79a
NB		 1645 int ret = 0;
1646
649ee054
BVA		 1647 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1648 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1649 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1650 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1651 cmd->t_state, sense_reason);
d43d6aea 1652 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1653 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1654 (cmd->transport_state & CMD_T_STOP) != 0,
1655 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1656
c66ac9db
NB		 1657 /*
1658 * For SAM Task Attribute emulation for failed struct se_cmd
1659 */
019c4ca6 1660 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1661 /*
1662 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1663 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1664 */
1665 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1666 cmd->transport_complete_callback)
c8e63985 1667 cmd->transport_complete_callback(cmd, false);
c66ac9db 1668
de103c93 1669 switch (sense_reason) {
03e98c9e
NB		 1670 case TCM_NON_EXISTENT_LUN:
1671 case TCM_UNSUPPORTED_SCSI_OPCODE:
1672 case TCM_INVALID_CDB_FIELD:
1673 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1674 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1675 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1676 case TCM_UNKNOWN_MODE_PAGE:
1677 case TCM_WRITE_PROTECTED:
e2397c70 1678 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1679 case TCM_CHECK_CONDITION_ABORT_CMD:
1680 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1681 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1682 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1683 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1684 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1685 break;
de103c93
CH		 1686 case TCM_OUT_OF_RESOURCES:
1687 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1688 break;
03e98c9e 1689 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1690 /*
1691 * No SENSE Data payload for this case, set SCSI Status
1692 * and queue the response to $FABRIC_MOD.
1693 *
1694 * Uses linux/include/scsi/scsi.h SAM status codes defs
1695 */
1696 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1697 /*
1698 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1699 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1700 * CONFLICT STATUS.
1701 *
1702 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1703 */
e3d6f909 1704 if (cmd->se_sess &&
0fd97ccf 1705 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1706 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1707 cmd->orig_fe_lun, 0x2C,
1708 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1709
e5c0d6ad
RD		 1710 trace_target_cmd_complete(cmd);
1711 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1712 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1713 goto queue_full;
c66ac9db 1714 goto check_stop;
c66ac9db 1715 default:
6708bb27 1716 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1717 cmd->t_task_cdb[0], sense_reason);
1718 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1719 break;
1720 }
f3146437 1721
de103c93 1722 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1723 if (ret == -EAGAIN || ret == -ENOMEM)
1724 goto queue_full;
07bde79a 1725
c66ac9db
NB		 1726check_stop:
1727 transport_lun_remove_cmd(cmd);
6708bb27 1728 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1729 ;
07bde79a
NB		 1730 return;
1731
1732queue_full:
e057f533
CH		 1733 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1734 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1735}
2fbff127 1736EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1737
76dde50e 1738void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1739{
de103c93 1740 sense_reason_t ret;
5f41a31d 1741
de103c93
CH		 1742 if (cmd->execute_cmd) {
1743 ret = cmd->execute_cmd(cmd);
1744 if (ret) {
1745 spin_lock_irq(&cmd->t_state_lock);
1746 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1747 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1748
de103c93
CH		 1749 transport_generic_request_failure(cmd, ret);
1750 }
5f41a31d
CH		 1751 }
1752}
1753
aa58b531
NB		 1754static int target_write_prot_action(struct se_cmd *cmd)
1755{
5132d1e6 1756 u32 sectors;
aa58b531
NB		 1757 /*
1758 * Perform WRITE_INSERT of PI using software emulation when backend
1759 * device has PI enabled, if the transport has not already generated
1760 * PI using hardware WRITE_INSERT offload.
1761 */
1762 switch (cmd->prot_op) {
1763 case TARGET_PROT_DOUT_INSERT:
1764 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1765 sbc_dif_generate(cmd);
1766 break;
5132d1e6
NB		 1767 case TARGET_PROT_DOUT_STRIP:
1768 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1769 break;
1770
1771 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1772 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1773 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1774 if (unlikely(cmd->pi_err)) {
1775 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1776 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1777 spin_unlock_irq(&cmd->t_state_lock);
1778 transport_generic_request_failure(cmd, cmd->pi_err);
1779 return -1;
1780 }
1781 break;
aa58b531
NB		 1782 default:
1783 break;
1784 }
1785
1786 return 0;
1787}
1788
019c4ca6 1789static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1790{
1791 struct se_device *dev = cmd->se_dev;
1792
a3541703 1793 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1794 return false;
5f41a31d 1795
c66ac9db 1796 /*
25985edc 1797 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1798 * to allow the passed struct se_cmd list of tasks to the front of the list.
1799 */
5f41a31d 1800 switch (cmd->sam_task_attr) {
68d81f40 1801 case TCM_HEAD_TAG:
5f41a31d
CH		 1802 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1803 "se_ordered_id: %u\n",
1804 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1805 return false;
68d81f40 1806 case TCM_ORDERED_TAG:
33940d09 1807 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1808
5f41a31d
CH		 1809 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1810 " se_ordered_id: %u\n",
1811 cmd->t_task_cdb[0], cmd->se_ordered_id);
1812
c66ac9db 1813 /*
5f41a31d
CH		 1814 * Execute an ORDERED command if no other older commands
1815 * exist that need to be completed first.
c66ac9db 1816 */
5f41a31d 1817 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1818 return false;
5f41a31d
CH		 1819 break;
1820 default:
c66ac9db
NB		 1821 /*
1822 * For SIMPLE and UNTAGGED Task Attribute commands
1823 */
33940d09 1824 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1825 break;
c66ac9db 1826 }
5f41a31d 1827
019c4ca6
CH		 1828 if (atomic_read(&dev->dev_ordered_sync) == 0)
1829 return false;
c66ac9db 1830
019c4ca6
CH		 1831 spin_lock(&dev->delayed_cmd_lock);
1832 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1833 spin_unlock(&dev->delayed_cmd_lock);
1834
1835 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1836 " delayed CMD list, se_ordered_id: %u\n",
1837 cmd->t_task_cdb[0], cmd->sam_task_attr,
1838 cmd->se_ordered_id);
1839 return true;
1840}
1841
1842void target_execute_cmd(struct se_cmd *cmd)
1843{
1844 /*
1845 * If the received CDB has aleady been aborted stop processing it here.
1846 */
4a9a6c8d 1847 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1848 return;
c66ac9db 1849
019c4ca6
CH		 1850 /*
1851 * Determine if frontend context caller is requesting the stopping of
1852 * this command for frontend exceptions.
1853 */
4a9a6c8d 1854 spin_lock_irq(&cmd->t_state_lock);
019c4ca6 1855 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1856 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1857 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1858
1859 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1860 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1861 return;
1862 }
1863
1864 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1865 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1866 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1867
1868 if (target_write_prot_action(cmd))
1869 return;
019c4ca6 1870
1a398b97
NB		 1871 if (target_handle_task_attr(cmd)) {
1872 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1873 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1874 spin_unlock_irq(&cmd->t_state_lock);
1875 return;
1876 }
1877
1878 __target_execute_cmd(cmd);
c66ac9db 1879}
70baf0ab 1880EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1881
5f41a31d
CH		 1882/*
1883 * Process all commands up to the last received ORDERED task attribute which
1884 * requires another blocking boundary
1885 */
1886static void target_restart_delayed_cmds(struct se_device *dev)
1887{
1888 for (;;) {
1889 struct se_cmd *cmd;
1890
1891 spin_lock(&dev->delayed_cmd_lock);
1892 if (list_empty(&dev->delayed_cmd_list)) {
1893 spin_unlock(&dev->delayed_cmd_lock);
1894 break;
1895 }
1896
1897 cmd = list_entry(dev->delayed_cmd_list.next,
1898 struct se_cmd, se_delayed_node);
1899 list_del(&cmd->se_delayed_node);
1900 spin_unlock(&dev->delayed_cmd_lock);
1901
1902 __target_execute_cmd(cmd);
1903
68d81f40 1904 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1905 break;
1906 }
1907}
1908
c66ac9db 1909/*
35e0e757 1910 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1911 * and ordered cmds need to have their tasks added to the execution queue.
1912 */
1913static void transport_complete_task_attr(struct se_cmd *cmd)
1914{
5951146d 1915 struct se_device *dev = cmd->se_dev;
c66ac9db 1916
a3541703 1917 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1918 return;
1919
68d81f40 1920 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1921 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1922 dev->dev_cur_ordered_id++;
6708bb27 1923 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1924 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1925 cmd->se_ordered_id);
68d81f40 1926 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1927 dev->dev_cur_ordered_id++;
6708bb27 1928 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1929 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1930 cmd->se_ordered_id);
68d81f40 1931 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1932 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1933
1934 dev->dev_cur_ordered_id++;
6708bb27 1935 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1936 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1937 }
c66ac9db 1938
5f41a31d 1939 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1940}
1941
e057f533 1942static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1943{
1944 int ret = 0;
1945
019c4ca6 1946 transport_complete_task_attr(cmd);
e057f533
CH		 1947
1948 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1949 trace_target_cmd_complete(cmd);
e057f533 1950 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1951 goto out;
e057f533 1952 }
07bde79a
NB		 1953
1954 switch (cmd->data_direction) {
1955 case DMA_FROM_DEVICE:
e5c0d6ad 1956 trace_target_cmd_complete(cmd);
07bde79a
NB		 1957 ret = cmd->se_tfo->queue_data_in(cmd);
1958 break;
1959 case DMA_TO_DEVICE:
64577407 1960 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1961 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1962 break;
07bde79a
NB		 1963 }
1964 /* Fall through for DMA_TO_DEVICE */
1965 case DMA_NONE:
e5c0d6ad 1966 trace_target_cmd_complete(cmd);
07bde79a
NB		 1967 ret = cmd->se_tfo->queue_status(cmd);
1968 break;
1969 default:
1970 break;
1971 }
1972
e057f533
CH		 1973out:
1974 if (ret < 0) {
1975 transport_handle_queue_full(cmd, cmd->se_dev);
1976 return;
1977 }
1978 transport_lun_remove_cmd(cmd);
1979 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1980}
1981
1982static void transport_handle_queue_full(
1983 struct se_cmd *cmd,
e057f533 1984 struct se_device *dev)
07bde79a
NB		 1985{
1986 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 1987 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 1988 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 1989 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1990
1991 schedule_work(&cmd->se_dev->qf_work_queue);
1992}
1993
fdeab852 1994static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 1995{
fdeab852
NB		 1996 switch (cmd->prot_op) {
1997 case TARGET_PROT_DIN_STRIP:
1998 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 1999 u32 sectors = cmd->data_length >>
2000 ilog2(cmd->se_dev->dev_attrib.block_size);
2001
2002 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2003 sectors, 0, cmd->t_prot_sg,
2004 0);
2005 if (cmd->pi_err)
fdeab852 2006 return true;
bc005869 2007 }
fdeab852 2008 break;
72c03850
NB		 2009 case TARGET_PROT_DIN_INSERT:
2010 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2011 break;
2012
2013 sbc_dif_generate(cmd);
2014 break;
fdeab852
NB		 2015 default:
2016 break;
bc005869
NB		 2017 }
2018
2019 return false;
2020}
2021
35e0e757 2022static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2023{
35e0e757 2024 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2025 int ret;
35e0e757 2026
c66ac9db
NB		 2027 /*
2028 * Check if we need to move delayed/dormant tasks from cmds on the
2029 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2030 * Attribute.
2031 */
019c4ca6
CH		 2032 transport_complete_task_attr(cmd);
2033
07bde79a
NB		 2034 /*
2035 * Check to schedule QUEUE_FULL work, or execute an existing
2036 * cmd->transport_qf_callback()
2037 */
2038 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2039 schedule_work(&cmd->se_dev->qf_work_queue);
2040
c66ac9db 2041 /*
d5829eac 2042 * Check if we need to send a sense buffer from
c66ac9db
NB		 2043 * the struct se_cmd in question.
2044 */
2045 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2046 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2047 ret = transport_send_check_condition_and_sense(
2048 cmd, 0, 1);
2049 if (ret == -EAGAIN || ret == -ENOMEM)
2050 goto queue_full;
2051
2052 transport_lun_remove_cmd(cmd);
2053 transport_cmd_check_stop_to_fabric(cmd);
2054 return;
c66ac9db
NB		 2055 }
2056 /*
25985edc 2057 * Check for a callback, used by amongst other things
a6b0133c 2058 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2059 */
a6b0133c
NB		 2060 if (cmd->transport_complete_callback) {
2061 sense_reason_t rc;
2062
c8e63985 2063 rc = cmd->transport_complete_callback(cmd, true);
a2890087 2064 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
c8e63985
NB		 2065 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2066 !cmd->data_length)
2067 goto queue_rsp;
2068
a6b0133c 2069 return;
a2890087
NB		 2070 } else if (rc) {
2071 ret = transport_send_check_condition_and_sense(cmd,
2072 rc, 0);
2073 if (ret == -EAGAIN || ret == -ENOMEM)
2074 goto queue_full;
a6b0133c 2075
a2890087
NB		 2076 transport_lun_remove_cmd(cmd);
2077 transport_cmd_check_stop_to_fabric(cmd);
2078 return;
2079 }
a6b0133c 2080 }
c66ac9db 2081
c8e63985 2082queue_rsp:
c66ac9db
NB		 2083 switch (cmd->data_direction) {
2084 case DMA_FROM_DEVICE:
2085 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2086 if (cmd->se_lun->lun_sep) {
2087 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2088 cmd->data_length;
2089 }
2090 spin_unlock(&cmd->se_lun->lun_sep_lock);
bc005869
NB		 2091 /*
2092 * Perform READ_STRIP of PI using software emulation when
2093 * backend had PI enabled, if the transport will not be
2094 * performing hardware READ_STRIP offload.
2095 */
fdeab852 2096 if (target_read_prot_action(cmd)) {
bc005869
NB		 2097 ret = transport_send_check_condition_and_sense(cmd,
2098 cmd->pi_err, 0);
2099 if (ret == -EAGAIN || ret == -ENOMEM)
2100 goto queue_full;
2101
2102 transport_lun_remove_cmd(cmd);
2103 transport_cmd_check_stop_to_fabric(cmd);
2104 return;
2105 }
c66ac9db 2106
e5c0d6ad 2107 trace_target_cmd_complete(cmd);
07bde79a 2108 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2109 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2110 goto queue_full;
c66ac9db
NB		 2111 break;
2112 case DMA_TO_DEVICE:
2113 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2114 if (cmd->se_lun->lun_sep) {
2115 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2116 cmd->data_length;
2117 }
2118 spin_unlock(&cmd->se_lun->lun_sep_lock);
2119 /*
2120 * Check if we need to send READ payload for BIDI-COMMAND
2121 */
64577407 2122 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 2123 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2124 if (cmd->se_lun->lun_sep) {
2125 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2126 cmd->data_length;
2127 }
2128 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2129 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2130 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2131 goto queue_full;
c66ac9db
NB		 2132 break;
2133 }
2134 /* Fall through for DMA_TO_DEVICE */
2135 case DMA_NONE:
e5c0d6ad 2136 trace_target_cmd_complete(cmd);
07bde79a 2137 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2138 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2139 goto queue_full;
c66ac9db
NB		 2140 break;
2141 default:
2142 break;
2143 }
2144
2145 transport_lun_remove_cmd(cmd);
2146 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2147 return;
2148
2149queue_full:
6708bb27 2150 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2151 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2152 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2153 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2154}
2155
6708bb27 2156static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2157{
ec98f782 2158 struct scatterlist *sg;
ec98f782 2159 int count;
c66ac9db 2160
6708bb27
AG		 2161 for_each_sg(sgl, sg, nents, count)
2162 __free_page(sg_page(sg));
c66ac9db 2163
6708bb27
AG		 2164 kfree(sgl);
2165}
c66ac9db 2166
47e459e6
NB		 2167static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2168{
2169 /*
2170 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2171 * emulation, and free + reset pointers if necessary..
2172 */
2173 if (!cmd->t_data_sg_orig)
2174 return;
2175
2176 kfree(cmd->t_data_sg);
2177 cmd->t_data_sg = cmd->t_data_sg_orig;
2178 cmd->t_data_sg_orig = NULL;
2179 cmd->t_data_nents = cmd->t_data_nents_orig;
2180 cmd->t_data_nents_orig = 0;
2181}
2182
6708bb27
AG		 2183static inline void transport_free_pages(struct se_cmd *cmd)
2184{
5835812f
AM		 2185 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2186 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2187 cmd->t_prot_sg = NULL;
2188 cmd->t_prot_nents = 0;
2189 }
2190
47e459e6 2191 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2192 /*
2193 * Release special case READ buffer payload required for
2194 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2195 */
2196 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2197 transport_free_sgl(cmd->t_bidi_data_sg,
2198 cmd->t_bidi_data_nents);
2199 cmd->t_bidi_data_sg = NULL;
2200 cmd->t_bidi_data_nents = 0;
2201 }
47e459e6 2202 transport_reset_sgl_orig(cmd);
6708bb27 2203 return;
47e459e6
NB		 2204 }
2205 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2206
2207 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2208 cmd->t_data_sg = NULL;
2209 cmd->t_data_nents = 0;
c66ac9db 2210
6708bb27 2211 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2212 cmd->t_bidi_data_sg = NULL;
2213 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2214}
2215
e26d99ae
CH		 2216/**
2217 * transport_release_cmd - free a command
2218 * @cmd: command to free
2219 *
2220 * This routine unconditionally frees a command, and reference counting
2221 * or list removal must be done in the caller.
2222 */
d5ddad41 2223static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2224{
2225 BUG_ON(!cmd->se_tfo);
2226
c8e31f26 2227 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2228 core_tmr_release_req(cmd->se_tmr_req);
2229 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2230 kfree(cmd->t_task_cdb);
2231 /*
7481deb4
NB		 2232 * If this cmd has been setup with target_get_sess_cmd(), drop
2233 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2234 */
afc16604 2235 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2236}
2237
d3df7825
CH		 2238/**
2239 * transport_put_cmd - release a reference to a command
2240 * @cmd: command to release
2241 *
2242 * This routine releases our reference to the command and frees it if possible.
2243 */
d5ddad41 2244static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2245{
c66ac9db 2246 transport_free_pages(cmd);
d5ddad41 2247 return transport_release_cmd(cmd);
c66ac9db 2248}
c66ac9db 2249
4949314c 2250void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2251{
ec98f782 2252 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2253 struct page **pages;
2254 int i;
05d1c7c0
AG		 2255
2256 /*
ec98f782
AG		 2257 * We need to take into account a possible offset here for fabrics like
2258 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2259 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2260 */
4949314c
AG		 2261 if (!cmd->t_data_nents)
2262 return NULL;
3717ef0c
PB		 2263
2264 BUG_ON(!sg);
2265 if (cmd->t_data_nents == 1)
4949314c
AG		 2266 return kmap(sg_page(sg)) + sg->offset;
2267
2268 /* >1 page. use vmap */
2269 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2270 if (!pages)
4949314c
AG		 2271 return NULL;
2272
2273 /* convert sg[] to pages[] */
2274 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2275 pages[i] = sg_page(sg);
2276 }
2277
2278 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2279 kfree(pages);
de103c93 2280 if (!cmd->t_data_vmap)
4949314c
AG		 2281 return NULL;
2282
2283 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2284}
4949314c 2285EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2286
4949314c 2287void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2288{
a1edf9cf 2289 if (!cmd->t_data_nents) {
4949314c 2290 return;
a1edf9cf 2291 } else if (cmd->t_data_nents == 1) {
4949314c 2292 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2293 return;
2294 }
4949314c
AG		 2295
2296 vunmap(cmd->t_data_vmap);
2297 cmd->t_data_vmap = NULL;
05d1c7c0 2298}
4949314c 2299EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2300
c5ff8d6b 2301int
20093994
NB		 2302target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2303 bool zero_page)
c66ac9db 2304{
20093994 2305 struct scatterlist *sg;
ec98f782 2306 struct page *page;
20093994
NB		 2307 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2308 unsigned int nent;
ec98f782 2309 int i = 0;
c66ac9db 2310
20093994
NB		 2311 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2312 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2313 if (!sg)
ec98f782 2314 return -ENOMEM;
c66ac9db 2315
20093994 2316 sg_init_table(sg, nent);
9db9da33 2317
ec98f782
AG		 2318 while (length) {
2319 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2320 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2321 if (!page)
2322 goto out;
c66ac9db 2323
20093994 2324 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2325 length -= page_len;
2326 i++;
c66ac9db 2327 }
20093994
NB		 2328 *sgl = sg;
2329 *nents = nent;
c66ac9db 2330 return 0;
c66ac9db 2331
ec98f782 2332out:
d0e27c88 2333 while (i > 0) {
ec98f782 2334 i--;
20093994 2335 __free_page(sg_page(&sg[i]));
c66ac9db 2336 }
20093994 2337 kfree(sg);
ec98f782 2338 return -ENOMEM;
c66ac9db
NB		 2339}
2340
da0f7619 2341/*
b16a35b0
AG		 2342 * Allocate any required resources to execute the command. For writes we
2343 * might not have the payload yet, so notify the fabric via a call to
2344 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2345 */
de103c93
CH		 2346sense_reason_t
2347transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2348{
c66ac9db 2349 int ret = 0;
c8e63985 2350 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2351
5835812f
AM		 2352 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2353 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2354 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2355 cmd->prot_length, true);
2356 if (ret < 0)
2357 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2358 }
2359
c66ac9db
NB		 2360 /*
2361 * Determine is the TCM fabric module has already allocated physical
2362 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2363 * beforehand.
c66ac9db 2364 */
ec98f782
AG		 2365 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2366 cmd->data_length) {
20093994 2367
8cefe07b
NB		 2368 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2369 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2370 u32 bidi_length;
2371
2372 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2373 bidi_length = cmd->t_task_nolb *
2374 cmd->se_dev->dev_attrib.block_size;
2375 else
2376 bidi_length = cmd->data_length;
2377
2378 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2379 &cmd->t_bidi_data_nents,
2380 bidi_length, zero_flag);
2381 if (ret < 0)
2382 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2383 }
2384
20093994
NB		 2385 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2386 cmd->data_length, zero_flag);
c66ac9db 2387 if (ret < 0)
de103c93 2388 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2389 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2390 cmd->data_length) {
2391 /*
2392 * Special case for COMPARE_AND_WRITE with fabrics
2393 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2394 */
2395 u32 caw_length = cmd->t_task_nolb *
2396 cmd->se_dev->dev_attrib.block_size;
2397
2398 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2399 &cmd->t_bidi_data_nents,
2400 caw_length, zero_flag);
2401 if (ret < 0)
2402 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2403 }
c66ac9db 2404 /*
c3196f0c
CH		 2405 * If this command is not a write we can execute it right here,
2406 * for write buffers we need to notify the fabric driver first
2407 * and let it call back once the write buffers are ready.
c66ac9db 2408 */
5f41a31d 2409 target_add_to_state_list(cmd);
885e7b0e 2410 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2411 target_execute_cmd(cmd);
2412 return 0;
2413 }
862e6389 2414 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2415
2416 ret = cmd->se_tfo->write_pending(cmd);
2417 if (ret == -EAGAIN || ret == -ENOMEM)
2418 goto queue_full;
2419
de103c93
CH		 2420 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2421 WARN_ON(ret);
2422
b69c1fcf 2423 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2424
c3196f0c
CH		 2425queue_full:
2426 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2427 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2428 transport_handle_queue_full(cmd, cmd->se_dev);
2429 return 0;
c66ac9db 2430}
a1d8b49a 2431EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2432
e057f533 2433static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2434{
f147abb4
NB		 2435 int ret;
2436
2437 ret = cmd->se_tfo->write_pending(cmd);
2438 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2439 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2440 cmd);
2441 transport_handle_queue_full(cmd, cmd->se_dev);
2442 }
07bde79a
NB		 2443}
2444
d5ddad41 2445int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2446{
c130480b 2447 unsigned long flags;
d5ddad41
NB		 2448 int ret = 0;
2449
d14921d6 2450 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2451 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2452 transport_wait_for_tasks(cmd);
2453
d5ddad41 2454 ret = transport_release_cmd(cmd);
d14921d6
NB		 2455 } else {
2456 if (wait_for_tasks)
2457 transport_wait_for_tasks(cmd);
c130480b
NB		 2458 /*
2459 * Handle WRITE failure case where transport_generic_new_cmd()
2460 * has already added se_cmd to state_list, but fabric has
2461 * failed command before I/O submission.
2462 */
2463 if (cmd->state_active) {
2464 spin_lock_irqsave(&cmd->t_state_lock, flags);
2465 target_remove_from_state_list(cmd);
2466 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2467 }
d14921d6 2468
82f1c8a4 2469 if (cmd->se_lun)
c66ac9db 2470 transport_lun_remove_cmd(cmd);
c66ac9db 2471
d5ddad41 2472 ret = transport_put_cmd(cmd);
c66ac9db 2473 }
d5ddad41 2474 return ret;
c66ac9db
NB		 2475}
2476EXPORT_SYMBOL(transport_generic_free_cmd);
2477
a17f091d 2478/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2479 * @se_cmd: command descriptor to add
a6360785 2480 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2481 */
afc16604 2482int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2483{
afc16604 2484 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2485 unsigned long flags;
bc187ea6 2486 int ret = 0;
a17f091d 2487
a6360785
NB		 2488 /*
2489 * Add a second kref if the fabric caller is expecting to handle
2490 * fabric acknowledgement that requires two target_put_sess_cmd()
2491 * invocations before se_cmd descriptor release.
2492 */
054922bb 2493 if (ack_kref)
a6360785 2494 kref_get(&se_cmd->cmd_kref);
7481deb4 2495
a17f091d 2496 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2497 if (se_sess->sess_tearing_down) {
2498 ret = -ESHUTDOWN;
2499 goto out;
2500 }
a17f091d 2501 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2502out:
a17f091d 2503 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2504
2505 if (ret && ack_kref)
afc16604 2506 target_put_sess_cmd(se_cmd);
7544e597 2507
bc187ea6 2508 return ret;
a17f091d 2509}
20361e69 2510EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2511
7481deb4 2512static void target_release_cmd_kref(struct kref *kref)
077aa3b2 2513 __releases(&se_cmd->se_sess->sess_cmd_lock)
a17f091d 2514{
7481deb4
NB		 2515 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2516 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2517
a17f091d 2518 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2519 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2520 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2521 return;
a17f091d 2522 }
a17f091d 2523 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2524 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2525 complete(&se_cmd->cmd_wait_comp);
7481deb4 2526 return;
a17f091d
NB		 2527 }
2528 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2529 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2530
7481deb4
NB		 2531 se_cmd->se_tfo->release_cmd(se_cmd);
2532}
2533
2534/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2535 * @se_cmd: command descriptor to drop
2536 */
afc16604 2537int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2538{
afc16604
BVA		 2539 struct se_session *se_sess = se_cmd->se_sess;
2540
0ed6e189
NB		 2541 if (!se_sess) {
2542 se_cmd->se_tfo->release_cmd(se_cmd);
2543 return 1;
2544 }
ccf5ae83
JE		 2545 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2546 &se_sess->sess_cmd_lock);
a17f091d
NB		 2547}
2548EXPORT_SYMBOL(target_put_sess_cmd);
2549
1c7b13fe
RD		 2550/* target_sess_cmd_list_set_waiting - Flag all commands in
2551 * sess_cmd_list to complete cmd_wait_comp. Set
2552 * sess_tearing_down so no more commands are queued.
2553 * @se_sess: session to flag
a17f091d 2554 */
1c7b13fe 2555void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2556{
2557 struct se_cmd *se_cmd;
2558 unsigned long flags;
2559
a17f091d 2560 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2561 if (se_sess->sess_tearing_down) {
2562 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2563 return;
2564 }
1c7b13fe 2565 se_sess->sess_tearing_down = 1;
9b31a328 2566 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2567
9b31a328 2568 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2569 se_cmd->cmd_wait_set = 1;
2570
2571 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2572}
1c7b13fe 2573EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2574
2575/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2576 * @se_sess: session to wait for active I/O
a17f091d 2577 */
be646c2d 2578void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2579{
2580 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2581 unsigned long flags;
a17f091d
NB		 2582
2583 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2584 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2585 list_del(&se_cmd->se_cmd_list);
2586
2587 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2588 " %d\n", se_cmd, se_cmd->t_state,
2589 se_cmd->se_tfo->get_cmd_state(se_cmd));
2590
be646c2d
JE		 2591 wait_for_completion(&se_cmd->cmd_wait_comp);
2592 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2593 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2594 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2595
2596 se_cmd->se_tfo->release_cmd(se_cmd);
2597 }
9b31a328
NB		 2598
2599 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2600 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2601 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2602
a17f091d
NB		 2603}
2604EXPORT_SYMBOL(target_wait_for_sess_cmds);
2605
5277797d 2606static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2607{
8359cf43 2608 struct se_lun *lun = p;
c66ac9db 2609
5277797d
NB		 2610 percpu_ref_kill(&lun->lun_ref);
2611
2612 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2613 complete(&lun->lun_shutdown_comp);
2614
2615 return 0;
2616}
2617
5277797d 2618int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2619{
2620 struct task_struct *kt;
2621
5277797d 2622 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2623 "tcm_cl_%u", lun->unpacked_lun);
2624 if (IS_ERR(kt)) {
6708bb27 2625 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2626 return PTR_ERR(kt);
c66ac9db
NB		 2627 }
2628 wait_for_completion(&lun->lun_shutdown_comp);
2629
2630 return 0;
2631}
2632
d14921d6
NB		 2633/**
2634 * transport_wait_for_tasks - wait for completion to occur
2635 * @cmd: command to wait
c66ac9db 2636 *
d14921d6
NB		 2637 * Called from frontend fabric context to wait for storage engine
2638 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2639 */
a17f091d 2640bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2641{
2642 unsigned long flags;
2643
a1d8b49a 2644 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2645 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2646 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2647 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2648 return false;
d14921d6 2649 }
cb4f4d3c 2650
c8e31f26
AG		 2651 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2652 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2653 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2654 return false;
d14921d6 2655 }
7d680f3b 2656
3d28934a 2657 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2658 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2659 return false;
d14921d6 2660 }
c66ac9db 2661
7d680f3b 2662 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2663
649ee054
BVA		 2664 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n",
2665 cmd, cmd->tag, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2666
a1d8b49a 2667 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2668
a1d8b49a 2669 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2670
a1d8b49a 2671 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2672 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2673
649ee054
BVA		 2674 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n",
2675 cmd->tag);
c66ac9db 2676
d14921d6 2677 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2678
2679 return true;
c66ac9db 2680}
d14921d6 2681EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2682
2683static int transport_get_sense_codes(
2684 struct se_cmd *cmd,
2685 u8 *asc,
2686 u8 *ascq)
2687{
2688 *asc = cmd->scsi_asc;
2689 *ascq = cmd->scsi_ascq;
2690
2691 return 0;
2692}
2693
76736db3
SG		 2694static
2695void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2696{
2697 /* Place failed LBA in sense data information descriptor 0. */
2698 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2699 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2700 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2701 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2702
2703 /* Descriptor Information: failing sector */
2704 put_unaligned_be64(bad_sector, &buffer[12]);
2705}
2706
de103c93
CH		 2707int
2708transport_send_check_condition_and_sense(struct se_cmd *cmd,
2709 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2710{
2711 unsigned char *buffer = cmd->sense_buffer;
2712 unsigned long flags;
c66ac9db
NB		 2713 u8 asc = 0, ascq = 0;
2714
a1d8b49a 2715 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2716 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2717 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2718 return 0;
2719 }
2720 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2721 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2722
2723 if (!reason && from_transport)
2724 goto after_reason;
2725
2726 if (!from_transport)
2727 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2728
c66ac9db
NB		 2729 /*
2730 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2731 * SENSE KEY values from include/scsi/scsi.h
2732 */
2733 switch (reason) {
ba829137
HR		 2734 case TCM_NO_SENSE:
2735 /* CURRENT ERROR */
2736 buffer[0] = 0x70;
2737 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2738 /* Not Ready */
2739 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2740 /* NO ADDITIONAL SENSE INFORMATION */
2741 buffer[SPC_ASC_KEY_OFFSET] = 0;
2742 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2743 break;
c66ac9db 2744 case TCM_NON_EXISTENT_LUN:
eb39d340 2745 /* CURRENT ERROR */
9c58b7dd
RD		 2746 buffer[0] = 0x70;
2747 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2748 /* ILLEGAL REQUEST */
9c58b7dd 2749 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2750 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2751 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2752 break;
c66ac9db
NB		 2753 case TCM_UNSUPPORTED_SCSI_OPCODE:
2754 case TCM_SECTOR_COUNT_TOO_MANY:
2755 /* CURRENT ERROR */
9c58b7dd
RD		 2756 buffer[0] = 0x70;
2757 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2758 /* ILLEGAL REQUEST */
9c58b7dd 2759 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2760 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2761 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2762 break;
2763 case TCM_UNKNOWN_MODE_PAGE:
2764 /* CURRENT ERROR */
9c58b7dd
RD		 2765 buffer[0] = 0x70;
2766 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2767 /* ILLEGAL REQUEST */
9c58b7dd 2768 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2769 /* INVALID FIELD IN CDB */
9c58b7dd 2770 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2771 break;
2772 case TCM_CHECK_CONDITION_ABORT_CMD:
2773 /* CURRENT ERROR */
9c58b7dd
RD		 2774 buffer[0] = 0x70;
2775 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2776 /* ABORTED COMMAND */
9c58b7dd 2777 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2778 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2779 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2780 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2781 break;
2782 case TCM_INCORRECT_AMOUNT_OF_DATA:
2783 /* CURRENT ERROR */
9c58b7dd
RD		 2784 buffer[0] = 0x70;
2785 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2786 /* ABORTED COMMAND */
9c58b7dd 2787 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2788 /* WRITE ERROR */
9c58b7dd 2789 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2790 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2791 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2792 break;
2793 case TCM_INVALID_CDB_FIELD:
2794 /* CURRENT ERROR */
9c58b7dd
RD		 2795 buffer[0] = 0x70;
2796 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2797 /* ILLEGAL REQUEST */
9c58b7dd 2798 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2799 /* INVALID FIELD IN CDB */
9c58b7dd 2800 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2801 break;
2802 case TCM_INVALID_PARAMETER_LIST:
2803 /* CURRENT ERROR */
9c58b7dd
RD		 2804 buffer[0] = 0x70;
2805 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2806 /* ILLEGAL REQUEST */
9c58b7dd 2807 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2808 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2809 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2810 break;
bb992e72
RD		 2811 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2812 /* CURRENT ERROR */
2813 buffer[0] = 0x70;
2814 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2815 /* ILLEGAL REQUEST */
2816 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2817 /* PARAMETER LIST LENGTH ERROR */
2818 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2819 break;
c66ac9db
NB		 2820 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2821 /* CURRENT ERROR */
9c58b7dd
RD		 2822 buffer[0] = 0x70;
2823 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2824 /* ABORTED COMMAND */
9c58b7dd 2825 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2826 /* WRITE ERROR */
9c58b7dd 2827 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2828 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2829 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2830 break;
2831 case TCM_SERVICE_CRC_ERROR:
2832 /* CURRENT ERROR */
9c58b7dd
RD		 2833 buffer[0] = 0x70;
2834 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2835 /* ABORTED COMMAND */
9c58b7dd 2836 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2837 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2838 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2839 /* N/A */
9c58b7dd 2840 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2841 break;
2842 case TCM_SNACK_REJECTED:
2843 /* CURRENT ERROR */
9c58b7dd
RD		 2844 buffer[0] = 0x70;
2845 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2846 /* ABORTED COMMAND */
9c58b7dd 2847 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2848 /* READ ERROR */
9c58b7dd 2849 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2850 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2851 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2852 break;
2853 case TCM_WRITE_PROTECTED:
2854 /* CURRENT ERROR */
9c58b7dd
RD		 2855 buffer[0] = 0x70;
2856 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2857 /* DATA PROTECT */
9c58b7dd 2858 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2859 /* WRITE PROTECTED */
9c58b7dd 2860 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2861 break;
e2397c70
RD		 2862 case TCM_ADDRESS_OUT_OF_RANGE:
2863 /* CURRENT ERROR */
9c58b7dd
RD		 2864 buffer[0] = 0x70;
2865 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2866 /* ILLEGAL REQUEST */
9c58b7dd 2867 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2868 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2869 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2870 break;
c66ac9db
NB		 2871 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2872 /* CURRENT ERROR */
9c58b7dd
RD		 2873 buffer[0] = 0x70;
2874 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2875 /* UNIT ATTENTION */
9c58b7dd 2876 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2877 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2878 buffer[SPC_ASC_KEY_OFFSET] = asc;
2879 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2880 break;
2881 case TCM_CHECK_CONDITION_NOT_READY:
2882 /* CURRENT ERROR */
9c58b7dd
RD		 2883 buffer[0] = 0x70;
2884 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2885 /* Not Ready */
9c58b7dd 2886 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2887 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2888 buffer[SPC_ASC_KEY_OFFSET] = asc;
2889 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2890 break;
818b571c
NB		 2891 case TCM_MISCOMPARE_VERIFY:
2892 /* CURRENT ERROR */
2893 buffer[0] = 0x70;
2894 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2895 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2896 /* MISCOMPARE DURING VERIFY OPERATION */
2897 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2898 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2899 break;
fcc4f17b
NB		 2900 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2901 /* CURRENT ERROR */
2902 buffer[0] = 0x70;
2903 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2904 /* ILLEGAL REQUEST */
2905 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2906 /* LOGICAL BLOCK GUARD CHECK FAILED */
2907 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2908 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
76736db3 2909 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2910 break;
2911 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2912 /* CURRENT ERROR */
2913 buffer[0] = 0x70;
2914 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2915 /* ILLEGAL REQUEST */
2916 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2917 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2918 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2919 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
76736db3 2920 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2921 break;
2922 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2923 /* CURRENT ERROR */
2924 buffer[0] = 0x70;
2925 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2926 /* ILLEGAL REQUEST */
2927 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2928 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2929 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2930 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
76736db3 2931 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b 2932 break;
c66ac9db
NB		 2933 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2934 default:
2935 /* CURRENT ERROR */
9c58b7dd
RD		 2936 buffer[0] = 0x70;
2937 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2938 /*
2939 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2940 * Solaris initiators. Returning NOT READY instead means the
2941 * operations will be retried a finite number of times and we
2942 * can survive intermittent errors.
2943 */
2944 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2945 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2946 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2947 break;
2948 }
2949 /*
2950 * This code uses linux/include/scsi/scsi.h SAM status codes!
2951 */
2952 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2953 /*
2954 * Automatically padded, this value is encoded in the fabric's
2955 * data_length response PDU containing the SCSI defined sense data.
2956 */
9c58b7dd 2957 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2958
2959after_reason:
e5c0d6ad 2960 trace_target_cmd_complete(cmd);
07bde79a 2961 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2962}
2963EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2964
2965int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2966{
c18bc7d8
RD		 2967 if (!(cmd->transport_state & CMD_T_ABORTED))
2968 return 0;
c66ac9db 2969
68259b5a
AL		 2970 /*
2971 * If cmd has been aborted but either no status is to be sent or it has
2972 * already been sent, just return
2973 */
2974 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2975 return 1;
8b1e1244 2976
649ee054
BVA		 2977 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n",
2978 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2979
68259b5a 2980 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2981 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2982 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2983 cmd->se_tfo->queue_status(cmd);
2984
2985 return 1;
c66ac9db
NB		 2986}
2987EXPORT_SYMBOL(transport_check_aborted_status);
2988
2989void transport_send_task_abort(struct se_cmd *cmd)
2990{
c252f003
NB		 2991 unsigned long flags;
2992
2993 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2994 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2995 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2996 return;
2997 }
2998 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2999
c66ac9db
NB		 3000 /*
3001 * If there are still expected incoming fabric WRITEs, we wait
3002 * until until they have completed before sending a TASK_ABORTED
3003 * response. This response with TASK_ABORTED status will be
3004 * queued back to fabric module by transport_check_aborted_status().
3005 */
3006 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3007 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 3008 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 3009 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
29f4c090 3010 return;
c66ac9db
NB		 3011 }
3012 }
3013 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3014
72b59d6e
RD		 3015 transport_lun_remove_cmd(cmd);
3016
649ee054
BVA		 3017 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3018 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3019
e5c0d6ad 3020 trace_target_cmd_complete(cmd);
e3d6f909 3021 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3022}
3023
af877292 3024static void target_tmr_work(struct work_struct *work)
c66ac9db 3025{
af877292 3026 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3027 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3028 struct se_tmr_req *tmr = cmd->se_tmr_req;
3029 int ret;
3030
3031 switch (tmr->function) {
5c6cd613 3032 case TMR_ABORT_TASK:
3d28934a 3033 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3034 break;
5c6cd613
NB		 3035 case TMR_ABORT_TASK_SET:
3036 case TMR_CLEAR_ACA:
3037 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3038 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3039 break;
5c6cd613 3040 case TMR_LUN_RESET:
c66ac9db
NB		 3041 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3042 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3043 TMR_FUNCTION_REJECTED;
3044 break;
5c6cd613 3045 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3046 tmr->response = TMR_FUNCTION_REJECTED;
3047 break;
5c6cd613 3048 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3049 tmr->response = TMR_FUNCTION_REJECTED;
3050 break;
c66ac9db 3051 default:
6708bb27 3052 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3053 tmr->function);
3054 tmr->response = TMR_FUNCTION_REJECTED;
3055 break;
3056 }
3057
3058 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3059 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3060
b7b8bef7 3061 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3062}
3063
af877292
CH		 3064int transport_generic_handle_tmr(
3065 struct se_cmd *cmd)
c66ac9db 3066{
f15e9cd9
NB		 3067 unsigned long flags;
3068
3069 spin_lock_irqsave(&cmd->t_state_lock, flags);
3070 cmd->transport_state |= CMD_T_ACTIVE;
3071 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3072
af877292
CH		 3073 INIT_WORK(&cmd->work, target_tmr_work);
3074 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3075 return 0;
3076}
af877292 3077EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3078
3079bool
3080target_check_wce(struct se_device *dev)
3081{
3082 bool wce = false;
3083
3084 if (dev->transport->get_write_cache)
3085 wce = dev->transport->get_write_cache(dev);
3086 else if (dev->dev_attrib.emulate_write_cache > 0)
3087 wce = true;
3088
3089 return wce;
3090}
3091
3092bool
3093target_check_fua(struct se_device *dev)
3094{
3095 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3096}
Linux kernel - Deliverables
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