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Merge tag 'for-linus-20170825' of git://git.infradead.org/linux-mtd
[mirror_ubuntu-artful-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
5538d294 37#include <linux/vmalloc.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
ba929992 41#include <scsi/scsi_proto.h>
9ec1e1ce 42#include <scsi/scsi_common.h>
c66ac9db
NB		 43
44#include <target/target_core_base.h>
c4795fb2
CH		 45#include <target/target_core_backend.h>
46#include <target/target_core_fabric.h>
c66ac9db 47
e26d99ae 48#include "target_core_internal.h"
c66ac9db 49#include "target_core_alua.h"
c66ac9db 50#include "target_core_pr.h"
c66ac9db
NB		 51#include "target_core_ua.h"
52
e5c0d6ad
RD		 53#define CREATE_TRACE_POINTS
54#include <trace/events/target.h>
55
35e0e757 56static struct workqueue_struct *target_completion_wq;
c66ac9db 57static struct kmem_cache *se_sess_cache;
c66ac9db 58struct kmem_cache *se_ua_cache;
c66ac9db
NB		 59struct kmem_cache *t10_pr_reg_cache;
60struct kmem_cache *t10_alua_lu_gp_cache;
61struct kmem_cache *t10_alua_lu_gp_mem_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_cache;
229d4f11
HR		 63struct kmem_cache *t10_alua_lba_map_cache;
64struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 65
c66ac9db 66static void transport_complete_task_attr(struct se_cmd *cmd);
fa7e25cf 67static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason);
07bde79a 68static void transport_handle_queue_full(struct se_cmd *cmd,
fa7e25cf 69 struct se_device *dev, int err, bool write_pending);
d5ddad41 70static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 71static void target_complete_ok_work(struct work_struct *work);
c66ac9db 72
e3d6f909 73int init_se_kmem_caches(void)
c66ac9db 74{
c66ac9db
NB		 75 se_sess_cache = kmem_cache_create("se_sess_cache",
76 sizeof(struct se_session), __alignof__(struct se_session),
77 0, NULL);
6708bb27
AG		 78 if (!se_sess_cache) {
79 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 80 " failed\n");
c8e31f26 81 goto out;
c66ac9db
NB		 82 }
83 se_ua_cache = kmem_cache_create("se_ua_cache",
84 sizeof(struct se_ua), __alignof__(struct se_ua),
85 0, NULL);
6708bb27
AG		 86 if (!se_ua_cache) {
87 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 88 goto out_free_sess_cache;
c66ac9db 89 }
c66ac9db
NB		 90 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
91 sizeof(struct t10_pr_registration),
92 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 93 if (!t10_pr_reg_cache) {
94 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 95 " failed\n");
35e0e757 96 goto out_free_ua_cache;
c66ac9db
NB		 97 }
98 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
99 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
100 0, NULL);
6708bb27
AG		 101 if (!t10_alua_lu_gp_cache) {
102 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 103 " failed\n");
35e0e757 104 goto out_free_pr_reg_cache;
c66ac9db
NB		 105 }
106 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
107 sizeof(struct t10_alua_lu_gp_member),
108 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 109 if (!t10_alua_lu_gp_mem_cache) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 111 "cache failed\n");
35e0e757 112 goto out_free_lu_gp_cache;
c66ac9db
NB		 113 }
114 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
115 sizeof(struct t10_alua_tg_pt_gp),
116 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 117 if (!t10_alua_tg_pt_gp_cache) {
118 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 119 "cache failed\n");
35e0e757 120 goto out_free_lu_gp_mem_cache;
c66ac9db 121 }
229d4f11
HR		 122 t10_alua_lba_map_cache = kmem_cache_create(
123 "t10_alua_lba_map_cache",
124 sizeof(struct t10_alua_lba_map),
125 __alignof__(struct t10_alua_lba_map), 0, NULL);
126 if (!t10_alua_lba_map_cache) {
127 pr_err("kmem_cache_create() for t10_alua_lba_map_"
128 "cache failed\n");
adf653f9 129 goto out_free_tg_pt_gp_cache;
229d4f11
HR		 130 }
131 t10_alua_lba_map_mem_cache = kmem_cache_create(
132 "t10_alua_lba_map_mem_cache",
133 sizeof(struct t10_alua_lba_map_member),
134 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
135 if (!t10_alua_lba_map_mem_cache) {
136 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
137 "cache failed\n");
138 goto out_free_lba_map_cache;
139 }
c66ac9db 140
35e0e757
CH		 141 target_completion_wq = alloc_workqueue("target_completion",
142 WQ_MEM_RECLAIM, 0);
143 if (!target_completion_wq)
229d4f11 144 goto out_free_lba_map_mem_cache;
35e0e757 145
c66ac9db 146 return 0;
35e0e757 147
229d4f11
HR		 148out_free_lba_map_mem_cache:
149 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
150out_free_lba_map_cache:
151 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 152out_free_tg_pt_gp_cache:
153 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
154out_free_lu_gp_mem_cache:
155 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
156out_free_lu_gp_cache:
157 kmem_cache_destroy(t10_alua_lu_gp_cache);
158out_free_pr_reg_cache:
159 kmem_cache_destroy(t10_pr_reg_cache);
160out_free_ua_cache:
161 kmem_cache_destroy(se_ua_cache);
162out_free_sess_cache:
163 kmem_cache_destroy(se_sess_cache);
c66ac9db 164out:
e3d6f909 165 return -ENOMEM;
c66ac9db
NB		 166}
167
e3d6f909 168void release_se_kmem_caches(void)
c66ac9db 169{
35e0e757 170 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 171 kmem_cache_destroy(se_sess_cache);
172 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 173 kmem_cache_destroy(t10_pr_reg_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_cache);
175 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
176 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
229d4f11
HR		 177 kmem_cache_destroy(t10_alua_lba_map_cache);
178 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 179}
180
e3d6f909
AG		 181/* This code ensures unique mib indexes are handed out. */
182static DEFINE_SPINLOCK(scsi_mib_index_lock);
183static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 184
185/*
186 * Allocate a new row index for the entry type specified
187 */
188u32 scsi_get_new_index(scsi_index_t type)
189{
190 u32 new_index;
191
e3d6f909 192 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 193
e3d6f909
AG		 194 spin_lock(&scsi_mib_index_lock);
195 new_index = ++scsi_mib_index[type];
196 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 197
198 return new_index;
199}
200
dbc5623e 201void transport_subsystem_check_init(void)
c66ac9db
NB		 202{
203 int ret;
283669d2 204 static int sub_api_initialized;
c66ac9db 205
dbc5623e
NB		 206 if (sub_api_initialized)
207 return;
208
c66ac9db
NB		 209 ret = request_module("target_core_iblock");
210 if (ret != 0)
6708bb27 211 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 212
213 ret = request_module("target_core_file");
214 if (ret != 0)
6708bb27 215 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 216
217 ret = request_module("target_core_pscsi");
218 if (ret != 0)
6708bb27 219 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 220
7c9e7a6f
AG		 221 ret = request_module("target_core_user");
222 if (ret != 0)
223 pr_err("Unable to load target_core_user\n");
224
e3d6f909 225 sub_api_initialized = 1;
c66ac9db
NB		 226}
227
e70beee7 228struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 229{
230 struct se_session *se_sess;
231
232 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 233 if (!se_sess) {
234 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 235 " se_sess_cache\n");
236 return ERR_PTR(-ENOMEM);
237 }
238 INIT_LIST_HEAD(&se_sess->sess_list);
239 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 240 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 241 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 242 spin_lock_init(&se_sess->sess_cmd_lock);
e70beee7 243 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 244
245 return se_sess;
246}
247EXPORT_SYMBOL(transport_init_session);
248
c0add7fd
NB		 249int transport_alloc_session_tags(struct se_session *se_sess,
250 unsigned int tag_num, unsigned int tag_size)
251{
252 int rc;
253
8c7f6e9b 254 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
dcda9b04 255 GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL);
c0add7fd 256 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 257 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
258 if (!se_sess->sess_cmd_map) {
259 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
260 return -ENOMEM;
261 }
c0add7fd
NB		 262 }
263
264 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
265 if (rc < 0) {
266 pr_err("Unable to init se_sess->sess_tag_pool,"
267 " tag_num: %u\n", tag_num);
de64d3a6 268 kvfree(se_sess->sess_cmd_map);
c0add7fd
NB		 269 se_sess->sess_cmd_map = NULL;
270 return -ENOMEM;
271 }
272
273 return 0;
274}
275EXPORT_SYMBOL(transport_alloc_session_tags);
276
277struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 278 unsigned int tag_size,
279 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 280{
281 struct se_session *se_sess;
282 int rc;
283
7861728d
NB		 284 if (tag_num != 0 && !tag_size) {
285 pr_err("init_session_tags called with percpu-ida tag_num:"
286 " %u, but zero tag_size\n", tag_num);
287 return ERR_PTR(-EINVAL);
288 }
289 if (!tag_num && tag_size) {
290 pr_err("init_session_tags called with percpu-ida tag_size:"
291 " %u, but zero tag_num\n", tag_size);
292 return ERR_PTR(-EINVAL);
293 }
294
e70beee7 295 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 296 if (IS_ERR(se_sess))
297 return se_sess;
298
299 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
300 if (rc < 0) {
301 transport_free_session(se_sess);
302 return ERR_PTR(-ENOMEM);
303 }
304
305 return se_sess;
306}
307EXPORT_SYMBOL(transport_init_session_tags);
308
c66ac9db 309/*
140854cb 310 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 311 */
312void __transport_register_session(
313 struct se_portal_group *se_tpg,
314 struct se_node_acl *se_nacl,
315 struct se_session *se_sess,
316 void *fabric_sess_ptr)
317{
9ac8928e 318 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 319 unsigned char buf[PR_REG_ISID_LEN];
320
321 se_sess->se_tpg = se_tpg;
322 se_sess->fabric_sess_ptr = fabric_sess_ptr;
323 /*
324 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
325 *
326 * Only set for struct se_session's that will actually be moving I/O.
327 * eg: *NOT* discovery sessions.
328 */
329 if (se_nacl) {
bffb5128
NB		 330 /*
331 *
332 * Determine if fabric allows for T10-PI feature bits exposed to
333 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
334 *
335 * If so, then always save prot_type on a per se_node_acl node
336 * basis and re-instate the previous sess_prot_type to avoid
337 * disabling PI from below any previously initiator side
338 * registered LUNs.
339 */
340 if (se_nacl->saved_prot_type)
341 se_sess->sess_prot_type = se_nacl->saved_prot_type;
342 else if (tfo->tpg_check_prot_fabric_only)
343 se_sess->sess_prot_type = se_nacl->saved_prot_type =
344 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 345 /*
346 * If the fabric module supports an ISID based TransportID,
347 * save this value in binary from the fabric I_T Nexus now.
348 */
e3d6f909 349 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 350 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 351 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 352 &buf[0], PR_REG_ISID_LEN);
353 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
354 }
afb999ff 355
c66ac9db
NB		 356 spin_lock_irq(&se_nacl->nacl_sess_lock);
357 /*
358 * The se_nacl->nacl_sess pointer will be set to the
359 * last active I_T Nexus for each struct se_node_acl.
360 */
361 se_nacl->nacl_sess = se_sess;
362
363 list_add_tail(&se_sess->sess_acl_list,
364 &se_nacl->acl_sess_list);
365 spin_unlock_irq(&se_nacl->nacl_sess_lock);
366 }
367 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
368
6708bb27 369 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 370 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 371}
372EXPORT_SYMBOL(__transport_register_session);
373
374void transport_register_session(
375 struct se_portal_group *se_tpg,
376 struct se_node_acl *se_nacl,
377 struct se_session *se_sess,
378 void *fabric_sess_ptr)
379{
140854cb
NB		 380 unsigned long flags;
381
382 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 383 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 384 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 385}
386EXPORT_SYMBOL(transport_register_session);
387
7861728d
NB		 388struct se_session *
389target_alloc_session(struct se_portal_group *tpg,
390 unsigned int tag_num, unsigned int tag_size,
391 enum target_prot_op prot_op,
392 const char *initiatorname, void *private,
393 int (*callback)(struct se_portal_group *,
394 struct se_session *, void *))
395{
396 struct se_session *sess;
397
398 /*
399 * If the fabric driver is using percpu-ida based pre allocation
400 * of I/O descriptor tags, go ahead and perform that setup now..
401 */
402 if (tag_num != 0)
403 sess = transport_init_session_tags(tag_num, tag_size, prot_op);
404 else
405 sess = transport_init_session(prot_op);
406
407 if (IS_ERR(sess))
408 return sess;
409
410 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
411 (unsigned char *)initiatorname);
412 if (!sess->se_node_acl) {
413 transport_free_session(sess);
414 return ERR_PTR(-EACCES);
415 }
416 /*
417 * Go ahead and perform any remaining fabric setup that is
418 * required before transport_register_session().
419 */
420 if (callback != NULL) {
421 int rc = callback(tpg, sess, private);
422 if (rc) {
423 transport_free_session(sess);
424 return ERR_PTR(rc);
425 }
426 }
427
428 transport_register_session(tpg, sess->se_node_acl, sess, private);
429 return sess;
430}
431EXPORT_SYMBOL(target_alloc_session);
432
f8e471f9
NB		 433ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
434{
435 struct se_session *se_sess;
436 ssize_t len = 0;
437
438 spin_lock_bh(&se_tpg->session_lock);
439 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
440 if (!se_sess->se_node_acl)
441 continue;
442 if (!se_sess->se_node_acl->dynamic_node_acl)
443 continue;
444 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
445 break;
446
447 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
448 se_sess->se_node_acl->initiatorname);
449 len += 1; /* Include NULL terminator */
450 }
451 spin_unlock_bh(&se_tpg->session_lock);
452
453 return len;
454}
455EXPORT_SYMBOL(target_show_dynamic_sessions);
456
afb999ff
NB		 457static void target_complete_nacl(struct kref *kref)
458{
459 struct se_node_acl *nacl = container_of(kref,
460 struct se_node_acl, acl_kref);
01d4d673 461 struct se_portal_group *se_tpg = nacl->se_tpg;
afb999ff 462
01d4d673
NB		 463 if (!nacl->dynamic_stop) {
464 complete(&nacl->acl_free_comp);
465 return;
466 }
467
468 mutex_lock(&se_tpg->acl_node_mutex);
6f48655f 469 list_del_init(&nacl->acl_list);
01d4d673
NB		 470 mutex_unlock(&se_tpg->acl_node_mutex);
471
472 core_tpg_wait_for_nacl_pr_ref(nacl);
473 core_free_device_list_for_node(nacl, se_tpg);
474 kfree(nacl);
afb999ff
NB		 475}
476
477void target_put_nacl(struct se_node_acl *nacl)
478{
479 kref_put(&nacl->acl_kref, target_complete_nacl);
480}
21aaa23b 481EXPORT_SYMBOL(target_put_nacl);
afb999ff 482
c66ac9db
NB		 483void transport_deregister_session_configfs(struct se_session *se_sess)
484{
485 struct se_node_acl *se_nacl;
23388864 486 unsigned long flags;
c66ac9db
NB		 487 /*
488 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
489 */
490 se_nacl = se_sess->se_node_acl;
6708bb27 491 if (se_nacl) {
23388864 492 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
fba81f88
CH		 493 if (!list_empty(&se_sess->sess_acl_list))
494 list_del_init(&se_sess->sess_acl_list);
c66ac9db
NB		 495 /*
496 * If the session list is empty, then clear the pointer.
497 * Otherwise, set the struct se_session pointer from the tail
498 * element of the per struct se_node_acl active session list.
499 */
500 if (list_empty(&se_nacl->acl_sess_list))
501 se_nacl->nacl_sess = NULL;
502 else {
503 se_nacl->nacl_sess = container_of(
504 se_nacl->acl_sess_list.prev,
505 struct se_session, sess_acl_list);
506 }
23388864 507 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 508 }
509}
510EXPORT_SYMBOL(transport_deregister_session_configfs);
511
512void transport_free_session(struct se_session *se_sess)
513{
21aaa23b 514 struct se_node_acl *se_nacl = se_sess->se_node_acl;
01d4d673 515
21aaa23b
NB		 516 /*
517 * Drop the se_node_acl->nacl_kref obtained from within
518 * core_tpg_get_initiator_node_acl().
519 */
520 if (se_nacl) {
01d4d673
NB		 521 struct se_portal_group *se_tpg = se_nacl->se_tpg;
522 const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo;
523 unsigned long flags;
524
21aaa23b 525 se_sess->se_node_acl = NULL;
01d4d673
NB		 526
527 /*
528 * Also determine if we need to drop the extra ->cmd_kref if
529 * it had been previously dynamically generated, and
530 * the endpoint is not caching dynamic ACLs.
531 */
532 mutex_lock(&se_tpg->acl_node_mutex);
533 if (se_nacl->dynamic_node_acl &&
534 !se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
535 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
536 if (list_empty(&se_nacl->acl_sess_list))
537 se_nacl->dynamic_stop = true;
538 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
539
540 if (se_nacl->dynamic_stop)
6f48655f 541 list_del_init(&se_nacl->acl_list);
01d4d673
NB		 542 }
543 mutex_unlock(&se_tpg->acl_node_mutex);
544
545 if (se_nacl->dynamic_stop)
546 target_put_nacl(se_nacl);
547
21aaa23b
NB		 548 target_put_nacl(se_nacl);
549 }
c0add7fd
NB		 550 if (se_sess->sess_cmd_map) {
551 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 552 kvfree(se_sess->sess_cmd_map);
c0add7fd 553 }
c66ac9db
NB		 554 kmem_cache_free(se_sess_cache, se_sess);
555}
556EXPORT_SYMBOL(transport_free_session);
557
558void transport_deregister_session(struct se_session *se_sess)
559{
560 struct se_portal_group *se_tpg = se_sess->se_tpg;
e63a8e19 561 unsigned long flags;
c66ac9db 562
6708bb27 563 if (!se_tpg) {
c66ac9db
NB		 564 transport_free_session(se_sess);
565 return;
566 }
c66ac9db 567
e63a8e19 568 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 569 list_del(&se_sess->sess_list);
570 se_sess->se_tpg = NULL;
571 se_sess->fabric_sess_ptr = NULL;
e63a8e19 572 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db 573
6708bb27 574 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 575 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 576 /*
125d0119 577 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff 578 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
21aaa23b 579 * removal context from within transport_free_session() code.
01d4d673
NB		 580 *
581 * For dynamic ACL, target_put_nacl() uses target_complete_nacl()
582 * to release all remaining generate_node_acl=1 created ACL resources.
01468346 583 */
01468346 584
afb999ff 585 transport_free_session(se_sess);
c66ac9db
NB		 586}
587EXPORT_SYMBOL(transport_deregister_session);
588
cf572a96 589static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 590{
42bf829e 591 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 592 unsigned long flags;
593
42bf829e
CH		 594 if (!dev)
595 return;
c66ac9db 596
cf572a96
CH		 597 spin_lock_irqsave(&dev->execute_task_lock, flags);
598 if (cmd->state_active) {
599 list_del(&cmd->state_list);
cf572a96 600 cmd->state_active = false;
c66ac9db 601 }
cf572a96 602 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 603}
604
b1a2ecda 605static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
c66ac9db
NB		 606{
607 unsigned long flags;
608
b1a2ecda 609 target_remove_from_state_list(cmd);
f7113a47 610
b1a2ecda
BVA		 611 /*
612 * Clear struct se_cmd->se_lun before the handoff to FE.
613 */
614 cmd->se_lun = NULL;
f7113a47 615
febe562c 616 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 617 /*
618 * Determine if frontend context caller is requesting the stopping of
e3d6f909 619 * this command for frontend exceptions.
c66ac9db 620 */
7d680f3b 621 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 622 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
623 __func__, __LINE__, cmd->tag);
c66ac9db 624
a1d8b49a 625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 626
a95d6511 627 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 628 return 1;
629 }
f7113a47 630 cmd->transport_state &= ~CMD_T_ACTIVE;
a1d8b49a 631 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 632
b1a2ecda
BVA		 633 /*
634 * Some fabric modules like tcm_loop can release their internally
635 * allocated I/O reference and struct se_cmd now.
636 *
637 * Fabric modules are expected to return '1' here if the se_cmd being
638 * passed is released at this point, or zero if not being released.
639 */
9c28ca4f 640 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 641}
642
643static void transport_lun_remove_cmd(struct se_cmd *cmd)
644{
e3d6f909 645 struct se_lun *lun = cmd->se_lun;
c66ac9db 646
5259a06e 647 if (!lun)
c66ac9db
NB		 648 return;
649
5259a06e
NB		 650 if (cmpxchg(&cmd->lun_ref_active, true, false))
651 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 652}
653
73d4e580 654int transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
c66ac9db 655{
febe562c 656 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
73d4e580 657 int ret = 0;
febe562c 658
68259b5a
AL		 659 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
660 transport_lun_remove_cmd(cmd);
131e6abc
NB		 661 /*
662 * Allow the fabric driver to unmap any resources before
663 * releasing the descriptor via TFO->release_cmd()
664 */
665 if (remove)
666 cmd->se_tfo->aborted_task(cmd);
68259b5a 667
c66ac9db 668 if (transport_cmd_check_stop_to_fabric(cmd))
73d4e580 669 return 1;
febe562c 670 if (remove && ack_kref)
73d4e580
NB		 671 ret = transport_put_cmd(cmd);
672
673 return ret;
c66ac9db
NB		 674}
675
35e0e757
CH		 676static void target_complete_failure_work(struct work_struct *work)
677{
678 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
679
de103c93
CH		 680 transport_generic_request_failure(cmd,
681 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 682}
683
6138ed2a 684/*
d5829eac
PB		 685 * Used when asking transport to copy Sense Data from the underlying
686 * Linux/SCSI struct scsi_cmnd
6138ed2a 687 */
d5829eac 688static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 689{
6138ed2a 690 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 691
692 WARN_ON(!cmd->se_lun);
693
694 if (!dev)
d5829eac 695 return NULL;
6138ed2a 696
d5829eac
PB		 697 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
698 return NULL;
6138ed2a 699
9c58b7dd 700 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 701
d5829eac 702 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 703 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 704 return cmd->sense_buffer;
6138ed2a
PB		 705}
706
c6d66aba
MC		 707void transport_copy_sense_to_cmd(struct se_cmd *cmd, unsigned char *sense)
708{
709 unsigned char *cmd_sense_buf;
710 unsigned long flags;
711
712 spin_lock_irqsave(&cmd->t_state_lock, flags);
713 cmd_sense_buf = transport_get_sense_buffer(cmd);
714 if (!cmd_sense_buf) {
715 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
716 return;
717 }
718
719 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
720 memcpy(cmd_sense_buf, sense, cmd->scsi_sense_length);
721 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
722}
723EXPORT_SYMBOL(transport_copy_sense_to_cmd);
724
5787cacd 725void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 726{
42bf829e 727 struct se_device *dev = cmd->se_dev;
402242c9 728 int success;
c66ac9db 729 unsigned long flags;
c66ac9db 730
5787cacd
CH		 731 cmd->scsi_status = scsi_status;
732
a1d8b49a 733 spin_lock_irqsave(&cmd->t_state_lock, flags);
402242c9
MC		 734 switch (cmd->scsi_status) {
735 case SAM_STAT_CHECK_CONDITION:
d5829eac 736 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 737 success = 1;
402242c9
MC		 738 else
739 success = 0;
740 break;
741 default:
9fe36984 742 success = 1;
402242c9 743 break;
c66ac9db
NB		 744 }
745
3d28934a 746 /*
125d0119 747 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 748 * and transport_wait_for_tasks() will be waiting for completion..
749 */
febe562c 750 if (cmd->transport_state & CMD_T_ABORTED ||
3d28934a
NB		 751 cmd->transport_state & CMD_T_STOP) {
752 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1d6ef276
JY		 753 /*
754 * If COMPARE_AND_WRITE was stopped by __transport_wait_for_tasks(),
755 * release se_device->caw_sem obtained by sbc_compare_and_write()
756 * since target_complete_ok_work() or target_complete_failure_work()
757 * won't be called to invoke the normal CAW completion callbacks.
758 */
759 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
760 up(&dev->caw_sem);
761 }
a95d6511 762 complete_all(&cmd->t_transport_stop_comp);
3d28934a 763 return;
3dca1471 764 } else if (!success) {
35e0e757 765 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 766 } else {
35e0e757 767 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 768 }
35e0e757 769
35e0e757 770 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 771 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 772 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 773
9095adaa 774 if (cmd->se_cmd_flags & SCF_USE_CPUID)
fb3269ba 775 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
9095adaa
QT		 776 else
777 queue_work(target_completion_wq, &cmd->work);
c66ac9db 778}
6bb35e00
CH		 779EXPORT_SYMBOL(target_complete_cmd);
780
2426bd45
RD		 781void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
782{
61f36166 783 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
2426bd45
RD		 784 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
785 cmd->residual_count += cmd->data_length - length;
786 } else {
787 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
788 cmd->residual_count = cmd->data_length - length;
789 }
790
791 cmd->data_length = length;
792 }
793
794 target_complete_cmd(cmd, scsi_status);
795}
796EXPORT_SYMBOL(target_complete_cmd_with_length);
797
cf572a96 798static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 799{
cf572a96
CH		 800 struct se_device *dev = cmd->se_dev;
801 unsigned long flags;
c66ac9db 802
cf572a96
CH		 803 spin_lock_irqsave(&dev->execute_task_lock, flags);
804 if (!cmd->state_active) {
805 list_add_tail(&cmd->state_list, &dev->state_list);
806 cmd->state_active = true;
c66ac9db 807 }
cf572a96 808 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 809}
810
07bde79a 811/*
f147abb4 812 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 813 */
7a6f0a1e
CH		 814static void transport_write_pending_qf(struct se_cmd *cmd);
815static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 816
0fd97ccf 817void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 818{
819 struct se_device *dev = container_of(work, struct se_device,
820 qf_work_queue);
bcac364a 821 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 822 struct se_cmd *cmd, *cmd_tmp;
823
824 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 825 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
826 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 827
bcac364a 828 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 829 list_del(&cmd->se_qf_node);
33940d09 830 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 831
6708bb27 832 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 833 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 834 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 835 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
836 : "UNKNOWN");
f7a5cc0b 837
7a6f0a1e
CH		 838 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
839 transport_write_pending_qf(cmd);
fa7e25cf
NB		 840 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK ||
841 cmd->t_state == TRANSPORT_COMPLETE_QF_ERR)
7a6f0a1e 842 transport_complete_qf(cmd);
07bde79a 843 }
07bde79a
NB		 844}
845
c66ac9db
NB		 846unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
847{
848 switch (cmd->data_direction) {
849 case DMA_NONE:
850 return "NONE";
851 case DMA_FROM_DEVICE:
852 return "READ";
853 case DMA_TO_DEVICE:
854 return "WRITE";
855 case DMA_BIDIRECTIONAL:
856 return "BIDI";
857 default:
858 break;
859 }
860
861 return "UNKNOWN";
862}
863
864void transport_dump_dev_state(
865 struct se_device *dev,
866 char *b,
867 int *bl)
868{
869 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 870 if (dev->export_count)
c66ac9db 871 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 872 else
c66ac9db 873 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 874
5f41a31d 875 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 876 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 877 dev->dev_attrib.block_size,
878 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 879 *bl += sprintf(b + *bl, " ");
880}
881
c66ac9db
NB		 882void transport_dump_vpd_proto_id(
883 struct t10_vpd *vpd,
884 unsigned char *p_buf,
885 int p_buf_len)
886{
887 unsigned char buf[VPD_TMP_BUF_SIZE];
888 int len;
889
890 memset(buf, 0, VPD_TMP_BUF_SIZE);
891 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
892
893 switch (vpd->protocol_identifier) {
894 case 0x00:
895 sprintf(buf+len, "Fibre Channel\n");
896 break;
897 case 0x10:
898 sprintf(buf+len, "Parallel SCSI\n");
899 break;
900 case 0x20:
901 sprintf(buf+len, "SSA\n");
902 break;
903 case 0x30:
904 sprintf(buf+len, "IEEE 1394\n");
905 break;
906 case 0x40:
907 sprintf(buf+len, "SCSI Remote Direct Memory Access"
908 " Protocol\n");
909 break;
910 case 0x50:
911 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
912 break;
913 case 0x60:
914 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
915 break;
916 case 0x70:
917 sprintf(buf+len, "Automation/Drive Interface Transport"
918 " Protocol\n");
919 break;
920 case 0x80:
921 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
922 break;
923 default:
924 sprintf(buf+len, "Unknown 0x%02x\n",
925 vpd->protocol_identifier);
926 break;
927 }
928
929 if (p_buf)
930 strncpy(p_buf, buf, p_buf_len);
931 else
6708bb27 932 pr_debug("%s", buf);
c66ac9db
NB		 933}
934
935void
936transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
937{
938 /*
939 * Check if the Protocol Identifier Valid (PIV) bit is set..
940 *
941 * from spc3r23.pdf section 7.5.1
942 */
943 if (page_83[1] & 0x80) {
944 vpd->protocol_identifier = (page_83[0] & 0xf0);
945 vpd->protocol_identifier_set = 1;
946 transport_dump_vpd_proto_id(vpd, NULL, 0);
947 }
948}
949EXPORT_SYMBOL(transport_set_vpd_proto_id);
950
951int transport_dump_vpd_assoc(
952 struct t10_vpd *vpd,
953 unsigned char *p_buf,
954 int p_buf_len)
955{
956 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 957 int ret = 0;
958 int len;
c66ac9db
NB		 959
960 memset(buf, 0, VPD_TMP_BUF_SIZE);
961 len = sprintf(buf, "T10 VPD Identifier Association: ");
962
963 switch (vpd->association) {
964 case 0x00:
965 sprintf(buf+len, "addressed logical unit\n");
966 break;
967 case 0x10:
968 sprintf(buf+len, "target port\n");
969 break;
970 case 0x20:
971 sprintf(buf+len, "SCSI target device\n");
972 break;
973 default:
974 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 975 ret = -EINVAL;
c66ac9db
NB		 976 break;
977 }
978
979 if (p_buf)
980 strncpy(p_buf, buf, p_buf_len);
981 else
6708bb27 982 pr_debug("%s", buf);
c66ac9db
NB		 983
984 return ret;
985}
986
987int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
988{
989 /*
990 * The VPD identification association..
991 *
992 * from spc3r23.pdf Section 7.6.3.1 Table 297
993 */
994 vpd->association = (page_83[1] & 0x30);
995 return transport_dump_vpd_assoc(vpd, NULL, 0);
996}
997EXPORT_SYMBOL(transport_set_vpd_assoc);
998
999int transport_dump_vpd_ident_type(
1000 struct t10_vpd *vpd,
1001 unsigned char *p_buf,
1002 int p_buf_len)
1003{
1004 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1005 int ret = 0;
1006 int len;
c66ac9db
NB		 1007
1008 memset(buf, 0, VPD_TMP_BUF_SIZE);
1009 len = sprintf(buf, "T10 VPD Identifier Type: ");
1010
1011 switch (vpd->device_identifier_type) {
1012 case 0x00:
1013 sprintf(buf+len, "Vendor specific\n");
1014 break;
1015 case 0x01:
1016 sprintf(buf+len, "T10 Vendor ID based\n");
1017 break;
1018 case 0x02:
1019 sprintf(buf+len, "EUI-64 based\n");
1020 break;
1021 case 0x03:
1022 sprintf(buf+len, "NAA\n");
1023 break;
1024 case 0x04:
1025 sprintf(buf+len, "Relative target port identifier\n");
1026 break;
1027 case 0x08:
1028 sprintf(buf+len, "SCSI name string\n");
1029 break;
1030 default:
1031 sprintf(buf+len, "Unsupported: 0x%02x\n",
1032 vpd->device_identifier_type);
e3d6f909 1033 ret = -EINVAL;
c66ac9db
NB		 1034 break;
1035 }
1036
e3d6f909
AG		 1037 if (p_buf) {
1038 if (p_buf_len < strlen(buf)+1)
1039 return -EINVAL;
c66ac9db 1040 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1041 } else {
6708bb27 1042 pr_debug("%s", buf);
e3d6f909 1043 }
c66ac9db
NB		 1044
1045 return ret;
1046}
1047
1048int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1049{
1050 /*
1051 * The VPD identifier type..
1052 *
1053 * from spc3r23.pdf Section 7.6.3.1 Table 298
1054 */
1055 vpd->device_identifier_type = (page_83[1] & 0x0f);
1056 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1057}
1058EXPORT_SYMBOL(transport_set_vpd_ident_type);
1059
1060int transport_dump_vpd_ident(
1061 struct t10_vpd *vpd,
1062 unsigned char *p_buf,
1063 int p_buf_len)
1064{
1065 unsigned char buf[VPD_TMP_BUF_SIZE];
1066 int ret = 0;
1067
1068 memset(buf, 0, VPD_TMP_BUF_SIZE);
1069
1070 switch (vpd->device_identifier_code_set) {
1071 case 0x01: /* Binary */
703d641d
DC		 1072 snprintf(buf, sizeof(buf),
1073 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1074 &vpd->device_identifier[0]);
1075 break;
1076 case 0x02: /* ASCII */
703d641d
DC		 1077 snprintf(buf, sizeof(buf),
1078 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1079 &vpd->device_identifier[0]);
1080 break;
1081 case 0x03: /* UTF-8 */
703d641d
DC		 1082 snprintf(buf, sizeof(buf),
1083 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1084 &vpd->device_identifier[0]);
1085 break;
1086 default:
1087 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1088 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1089 ret = -EINVAL;
c66ac9db
NB		 1090 break;
1091 }
1092
1093 if (p_buf)
1094 strncpy(p_buf, buf, p_buf_len);
1095 else
6708bb27 1096 pr_debug("%s", buf);
c66ac9db
NB		 1097
1098 return ret;
1099}
1100
1101int
1102transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1103{
1104 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1105 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1106
1107 /*
1108 * The VPD Code Set (encoding)
1109 *
1110 * from spc3r23.pdf Section 7.6.3.1 Table 296
1111 */
1112 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1113 switch (vpd->device_identifier_code_set) {
1114 case 0x01: /* Binary */
1115 vpd->device_identifier[j++] =
1116 hex_str[vpd->device_identifier_type];
1117 while (i < (4 + page_83[3])) {
1118 vpd->device_identifier[j++] =
1119 hex_str[(page_83[i] & 0xf0) >> 4];
1120 vpd->device_identifier[j++] =
1121 hex_str[page_83[i] & 0x0f];
1122 i++;
1123 }
1124 break;
1125 case 0x02: /* ASCII */
1126 case 0x03: /* UTF-8 */
1127 while (i < (4 + page_83[3]))
1128 vpd->device_identifier[j++] = page_83[i++];
1129 break;
1130 default:
1131 break;
1132 }
1133
1134 return transport_dump_vpd_ident(vpd, NULL, 0);
1135}
1136EXPORT_SYMBOL(transport_set_vpd_ident);
1137
8f9b5654
NB		 1138static sense_reason_t
1139target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1140 unsigned int size)
1141{
1142 u32 mtl;
1143
1144 if (!cmd->se_tfo->max_data_sg_nents)
1145 return TCM_NO_SENSE;
1146 /*
1147 * Check if fabric enforced maximum SGL entries per I/O descriptor
1148 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1149 * residual_count and reduce original cmd->data_length to maximum
1150 * length based on single PAGE_SIZE entry scatter-lists.
1151 */
1152 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1153 if (cmd->data_length > mtl) {
1154 /*
1155 * If an existing CDB overflow is present, calculate new residual
1156 * based on CDB size minus fabric maximum transfer length.
1157 *
1158 * If an existing CDB underflow is present, calculate new residual
1159 * based on original cmd->data_length minus fabric maximum transfer
1160 * length.
1161 *
1162 * Otherwise, set the underflow residual based on cmd->data_length
1163 * minus fabric maximum transfer length.
1164 */
1165 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1166 cmd->residual_count = (size - mtl);
1167 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1168 u32 orig_dl = size + cmd->residual_count;
1169 cmd->residual_count = (orig_dl - mtl);
1170 } else {
1171 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1172 cmd->residual_count = (cmd->data_length - mtl);
1173 }
1174 cmd->data_length = mtl;
1175 /*
1176 * Reset sbc_check_prot() calculated protection payload
1177 * length based upon the new smaller MTL.
1178 */
1179 if (cmd->prot_length) {
1180 u32 sectors = (mtl / dev->dev_attrib.block_size);
1181 cmd->prot_length = dev->prot_length * sectors;
1182 }
1183 }
1184 return TCM_NO_SENSE;
1185}
1186
de103c93
CH		 1187sense_reason_t
1188target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1189{
1190 struct se_device *dev = cmd->se_dev;
1191
1192 if (cmd->unknown_data_length) {
1193 cmd->data_length = size;
1194 } else if (size != cmd->data_length) {
4ff83daa 1195 pr_warn_ratelimited("TARGET_CORE[%s]: Expected Transfer Length:"
9b3b8041
CH		 1196 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1197 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1198 cmd->data_length, size, cmd->t_task_cdb[0]);
1199
4ff83daa
NB		 1200 if (cmd->data_direction == DMA_TO_DEVICE) {
1201 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1202 pr_err_ratelimited("Rejecting underflow/overflow"
1203 " for WRITE data CDB\n");
1204 return TCM_INVALID_CDB_FIELD;
1205 }
1206 /*
1207 * Some fabric drivers like iscsi-target still expect to
1208 * always reject overflow writes. Reject this case until
1209 * full fabric driver level support for overflow writes
1210 * is introduced tree-wide.
1211 */
1212 if (size > cmd->data_length) {
1213 pr_err_ratelimited("Rejecting overflow for"
1214 " WRITE control CDB\n");
1215 return TCM_INVALID_CDB_FIELD;
1216 }
9b3b8041
CH		 1217 }
1218 /*
1219 * Reject READ_* or WRITE_* with overflow/underflow for
1220 * type SCF_SCSI_DATA_CDB.
1221 */
0fd97ccf 1222 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1223 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1224 " CDB on non 512-byte sector setup subsystem"
1225 " plugin: %s\n", dev->transport->name);
1226 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1227 return TCM_INVALID_CDB_FIELD;
9b3b8041 1228 }
4c054ba6
NB		 1229 /*
1230 * For the overflow case keep the existing fabric provided
1231 * ->data_length. Otherwise for the underflow case, reset
1232 * ->data_length to the smaller SCSI expected data transfer
1233 * length.
1234 */
9b3b8041
CH		 1235 if (size > cmd->data_length) {
1236 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1237 cmd->residual_count = (size - cmd->data_length);
1238 } else {
1239 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1240 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1241 cmd->data_length = size;
9b3b8041 1242 }
9b3b8041
CH		 1243 }
1244
8f9b5654 1245 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1246
9b3b8041
CH		 1247}
1248
c66ac9db
NB		 1249/*
1250 * Used by fabric modules containing a local struct se_cmd within their
1251 * fabric dependent per I/O descriptor.
649ee054
BVA		 1252 *
1253 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1254 */
1255void transport_init_se_cmd(
1256 struct se_cmd *cmd,
9ac8928e 1257 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1258 struct se_session *se_sess,
1259 u32 data_length,
1260 int data_direction,
1261 int task_attr,
1262 unsigned char *sense_buffer)
1263{
5951146d 1264 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1265 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1266 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1267 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1268 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1269 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1270 spin_lock_init(&cmd->t_state_lock);
f2b72d6a 1271 INIT_WORK(&cmd->work, NULL);
1e1110c4 1272 kref_init(&cmd->cmd_kref);
c66ac9db
NB		 1273
1274 cmd->se_tfo = tfo;
1275 cmd->se_sess = se_sess;
1276 cmd->data_length = data_length;
1277 cmd->data_direction = data_direction;
1278 cmd->sam_task_attr = task_attr;
1279 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1280
1281 cmd->state_active = false;
c66ac9db
NB		 1282}
1283EXPORT_SYMBOL(transport_init_se_cmd);
1284
de103c93
CH		 1285static sense_reason_t
1286transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1287{
019c4ca6
CH		 1288 struct se_device *dev = cmd->se_dev;
1289
c66ac9db
NB		 1290 /*
1291 * Check if SAM Task Attribute emulation is enabled for this
1292 * struct se_device storage object
1293 */
a3541703 1294 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1295 return 0;
1296
68d81f40 1297 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1298 pr_debug("SAM Task Attribute ACA"
c66ac9db 1299 " emulation is not supported\n");
de103c93 1300 return TCM_INVALID_CDB_FIELD;
c66ac9db 1301 }
9c31820b 1302
c66ac9db
NB		 1303 return 0;
1304}
1305
de103c93
CH		 1306sense_reason_t
1307target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1308{
0fd97ccf 1309 struct se_device *dev = cmd->se_dev;
de103c93 1310 sense_reason_t ret;
c66ac9db 1311
c66ac9db
NB		 1312 /*
1313 * Ensure that the received CDB is less than the max (252 + 8) bytes
1314 * for VARIABLE_LENGTH_CMD
1315 */
1316 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1317 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1318 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1319 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1320 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1321 }
1322 /*
1323 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1324 * allocate the additional extended CDB buffer now.. Otherwise
1325 * setup the pointer from __t_task_cdb to t_task_cdb.
1326 */
a1d8b49a
AG		 1327 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1328 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1329 GFP_KERNEL);
6708bb27
AG		 1330 if (!cmd->t_task_cdb) {
1331 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1332 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1333 scsi_command_size(cdb),
a1d8b49a 1334 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1335 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1336 }
1337 } else
a1d8b49a 1338 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1339 /*
a1d8b49a 1340 * Copy the original CDB into cmd->
c66ac9db 1341 */
a1d8b49a 1342 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1343
e5c0d6ad
RD		 1344 trace_target_sequencer_start(cmd);
1345
0fd97ccf 1346 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1347 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1348 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1349 cmd->se_tfo->get_fabric_name(),
1350 cmd->se_sess->se_node_acl->initiatorname,
1351 cmd->t_task_cdb[0]);
de103c93
CH		 1352 if (ret)
1353 return ret;
1354
1355 ret = transport_check_alloc_task_attr(cmd);
1356 if (ret)
c66ac9db 1357 return ret;
cb4f4d3c 1358
cb4f4d3c 1359 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1360 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1361 return 0;
1362}
a12f41f8 1363EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1364
695434e1
NB		 1365/*
1366 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1367 * May only be used from process context.
695434e1
NB		 1368 */
1369int transport_handle_cdb_direct(
1370 struct se_cmd *cmd)
1371{
de103c93 1372 sense_reason_t ret;
dd8ae59d 1373
695434e1
NB		 1374 if (!cmd->se_lun) {
1375 dump_stack();
6708bb27 1376 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1377 return -EINVAL;
1378 }
1379 if (in_interrupt()) {
1380 dump_stack();
6708bb27 1381 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1382 " from interrupt context\n");
1383 return -EINVAL;
1384 }
dd8ae59d 1385 /*
af877292
CH		 1386 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1387 * outstanding descriptors are handled correctly during shutdown via
1388 * transport_wait_for_tasks()
dd8ae59d
NB		 1389 *
1390 * Also, we don't take cmd->t_state_lock here as we only expect
1391 * this to be called for initial descriptor submission.
1392 */
1393 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1394 cmd->transport_state |= CMD_T_ACTIVE;
1395
dd8ae59d
NB		 1396 /*
1397 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1398 * so follow TRANSPORT_NEW_CMD processing thread context usage
1399 * and call transport_generic_request_failure() if necessary..
1400 */
1401 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1402 if (ret)
1403 transport_generic_request_failure(cmd, ret);
dd8ae59d 1404 return 0;
695434e1
NB		 1405}
1406EXPORT_SYMBOL(transport_handle_cdb_direct);
1407
c5ff8d6b 1408sense_reason_t
de103c93
CH		 1409transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1410 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1411{
1412 if (!sgl || !sgl_count)
1413 return 0;
1414
1415 /*
1416 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1417 * scatterlists already have been set to follow what the fabric
1418 * passes for the original expected data transfer length.
1419 */
1420 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1421 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1422 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1423 return TCM_INVALID_CDB_FIELD;
1424 }
1425
1426 cmd->t_data_sg = sgl;
1427 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1428 cmd->t_bidi_data_sg = sgl_bidi;
1429 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1430
de103c93
CH		 1431 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1432 return 0;
1433}
1434
a026757f
NB		 1435/*
1436 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1437 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1438 *
1439 * @se_cmd: command descriptor to submit
1440 * @se_sess: associated se_sess for endpoint
1441 * @cdb: pointer to SCSI CDB
1442 * @sense: pointer to SCSI sense buffer
1443 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1444 * @data_length: fabric expected data transfer length
1445 * @task_addr: SAM task attribute
1446 * @data_dir: DMA data direction
1447 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1448 * @sgl: struct scatterlist memory for unidirectional mapping
1449 * @sgl_count: scatterlist count for unidirectional mapping
1450 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1451 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1452 * @sgl_prot: struct scatterlist memory protection information
1453 * @sgl_prot_count: scatterlist count for protection information
a6360785 1454 *
649ee054
BVA		 1455 * Task tags are supported if the caller has set @se_cmd->tag.
1456 *
d6dfc868
RD		 1457 * Returns non zero to signal active I/O shutdown failure. All other
1458 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1459 * but still return zero here.
1460 *
a6360785
NB		 1461 * This may only be called from process context, and also currently
1462 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1463 */
1464int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1465 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1466 u32 data_length, int task_attr, int data_dir, int flags,
1467 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1468 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1469 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1470{
1471 struct se_portal_group *se_tpg;
de103c93
CH		 1472 sense_reason_t rc;
1473 int ret;
a6360785
NB		 1474
1475 se_tpg = se_sess->se_tpg;
1476 BUG_ON(!se_tpg);
1477 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1478 BUG_ON(in_interrupt());
1479 /*
1480 * Initialize se_cmd for target operation. From this point
1481 * exceptions are handled by sending exception status via
1482 * target_core_fabric_ops->queue_status() callback
1483 */
1484 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1485 data_length, data_dir, task_attr, sense);
9095adaa
QT		 1486
1487 if (flags & TARGET_SCF_USE_CPUID)
1488 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1489 else
1490 se_cmd->cpuid = WORK_CPU_UNBOUND;
1491
b0d79946
SAS		 1492 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1493 se_cmd->unknown_data_length = 1;
a6360785
NB		 1494 /*
1495 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1496 * se_sess->sess_cmd_list. A second kref_get here is necessary
1497 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1498 * kref_put() to happen during fabric packet acknowledgement.
1499 */
afc16604 1500 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1501 if (ret)
1502 return ret;
a6360785
NB		 1503 /*
1504 * Signal bidirectional data payloads to target-core
1505 */
1506 if (flags & TARGET_SCF_BIDI_OP)
1507 se_cmd->se_cmd_flags |= SCF_BIDI;
1508 /*
1509 * Locate se_lun pointer and attach it to struct se_cmd
1510 */
de103c93
CH		 1511 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1512 if (rc) {
1513 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1514 target_put_sess_cmd(se_cmd);
d6dfc868 1515 return 0;
735703ca 1516 }
b5b8e298
SG		 1517
1518 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1519 if (rc != 0) {
1520 transport_generic_request_failure(se_cmd, rc);
1521 return 0;
1522 }
1523
def2b339
NB		 1524 /*
1525 * Save pointers for SGLs containing protection information,
1526 * if present.
1527 */
1528 if (sgl_prot_count) {
1529 se_cmd->t_prot_sg = sgl_prot;
1530 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1531 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1532 }
d6e0175c 1533
a026757f
NB		 1534 /*
1535 * When a non zero sgl_count has been passed perform SGL passthrough
1536 * mapping for pre-allocated fabric memory instead of having target
1537 * core perform an internal SGL allocation..
1538 */
1539 if (sgl_count != 0) {
1540 BUG_ON(!sgl);
1541
944981c7
NB		 1542 /*
1543 * A work-around for tcm_loop as some userspace code via
1544 * scsi-generic do not memset their associated read buffers,
1545 * so go ahead and do that here for type non-data CDBs. Also
1546 * note that this is currently guaranteed to be a single SGL
1547 * for this case by target core in target_setup_cmd_from_cdb()
1548 * -> transport_generic_cmd_sequencer().
1549 */
1550 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1551 se_cmd->data_direction == DMA_FROM_DEVICE) {
1552 unsigned char *buf = NULL;
1553
1554 if (sgl)
1555 buf = kmap(sg_page(sgl)) + sgl->offset;
1556
1557 if (buf) {
1558 memset(buf, 0, sgl->length);
1559 kunmap(sg_page(sgl));
1560 }
1561 }
1562
a026757f
NB		 1563 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1564 sgl_bidi, sgl_bidi_count);
1565 if (rc != 0) {
de103c93 1566 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1567 return 0;
1568 }
1569 }
def2b339 1570
11e319ed
AG		 1571 /*
1572 * Check if we need to delay processing because of ALUA
1573 * Active/NonOptimized primary access state..
1574 */
1575 core_alua_check_nonop_delay(se_cmd);
1576
a6360785 1577 transport_handle_cdb_direct(se_cmd);
d6dfc868 1578 return 0;
a6360785 1579}
a026757f
NB		 1580EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1581
1582/*
1583 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1584 *
1585 * @se_cmd: command descriptor to submit
1586 * @se_sess: associated se_sess for endpoint
1587 * @cdb: pointer to SCSI CDB
1588 * @sense: pointer to SCSI sense buffer
1589 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1590 * @data_length: fabric expected data transfer length
1591 * @task_addr: SAM task attribute
1592 * @data_dir: DMA data direction
1593 * @flags: flags for command submission from target_sc_flags_tables
1594 *
649ee054
BVA		 1595 * Task tags are supported if the caller has set @se_cmd->tag.
1596 *
a026757f
NB		 1597 * Returns non zero to signal active I/O shutdown failure. All other
1598 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1599 * but still return zero here.
1600 *
1601 * This may only be called from process context, and also currently
1602 * assumes internal allocation of fabric payload buffer by target-core.
1603 *
1604 * It also assumes interal target core SGL memory allocation.
1605 */
1606int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1607 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1608 u32 data_length, int task_attr, int data_dir, int flags)
1609{
1610 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1611 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1612 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1613}
a6360785
NB		 1614EXPORT_SYMBOL(target_submit_cmd);
1615
9f0d05c2
NB		 1616static void target_complete_tmr_failure(struct work_struct *work)
1617{
1618 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1619
1620 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1621 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0 1622
eeb64d23 1623 transport_lun_remove_cmd(se_cmd);
5a3b6fc0 1624 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1625}
1626
5465e7d3
NB		 1627static bool target_lookup_lun_from_tag(struct se_session *se_sess, u64 tag,
1628 u64 *unpacked_lun)
1629{
1630 struct se_cmd *se_cmd;
1631 unsigned long flags;
1632 bool ret = false;
1633
1634 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
1635 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {
1636 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
1637 continue;
1638
1639 if (se_cmd->tag == tag) {
1640 *unpacked_lun = se_cmd->orig_fe_lun;
1641 ret = true;
1642 break;
1643 }
1644 }
1645 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
1646
1647 return ret;
1648}
1649
ea98d7f9
AG		 1650/**
1651 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1652 * for TMR CDBs
1653 *
1654 * @se_cmd: command descriptor to submit
1655 * @se_sess: associated se_sess for endpoint
1656 * @sense: pointer to SCSI sense buffer
1657 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1658 * @fabric_context: fabric context for TMR req
1659 * @tm_type: Type of TM request
c0974f89
NB		 1660 * @gfp: gfp type for caller
1661 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1662 * @flags: submit cmd flags
ea98d7f9
AG		 1663 *
1664 * Callable from all contexts.
1665 **/
1666
c7042cae 1667int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1668 unsigned char *sense, u64 unpacked_lun,
c0974f89 1669 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1670 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1671{
1672 struct se_portal_group *se_tpg;
1673 int ret;
1674
1675 se_tpg = se_sess->se_tpg;
1676 BUG_ON(!se_tpg);
1677
1678 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1679 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1680 /*
1681 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1682 * allocation failure.
1683 */
c0974f89 1684 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1685 if (ret < 0)
1686 return -ENOMEM;
ea98d7f9 1687
c0974f89
NB		 1688 if (tm_type == TMR_ABORT_TASK)
1689 se_cmd->se_tmr_req->ref_task_tag = tag;
1690
ea98d7f9 1691 /* See target_submit_cmd for commentary */
afc16604 1692 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1693 if (ret) {
1694 core_tmr_release_req(se_cmd->se_tmr_req);
1695 return ret;
1696 }
5465e7d3
NB		 1697 /*
1698 * If this is ABORT_TASK with no explicit fabric provided LUN,
1699 * go ahead and search active session tags for a match to figure
1700 * out unpacked_lun for the original se_cmd.
1701 */
1702 if (tm_type == TMR_ABORT_TASK && (flags & TARGET_SCF_LOOKUP_LUN_FROM_TAG)) {
1703 if (!target_lookup_lun_from_tag(se_sess, tag, &unpacked_lun))
1704 goto failure;
1705 }
ea98d7f9 1706
ea98d7f9 1707 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
5465e7d3
NB		 1708 if (ret)
1709 goto failure;
1710
ea98d7f9 1711 transport_generic_handle_tmr(se_cmd);
c7042cae 1712 return 0;
5465e7d3
NB		 1713
1714 /*
1715 * For callback during failure handling, push this work off
1716 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1717 */
1718failure:
1719 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1720 schedule_work(&se_cmd->work);
1721 return 0;
ea98d7f9
AG		 1722}
1723EXPORT_SYMBOL(target_submit_tmr);
1724
c66ac9db
NB		 1725/*
1726 * Handle SAM-esque emulation for generic transport request failures.
1727 */
de103c93
CH		 1728void transport_generic_request_failure(struct se_cmd *cmd,
1729 sense_reason_t sense_reason)
c66ac9db 1730{
057085e5 1731 int ret = 0, post_ret = 0;
07bde79a 1732
e3b88ee9
BVA		 1733 if (transport_check_aborted_status(cmd, 1))
1734 return;
1735
c00e6220
BVA		 1736 pr_debug("-----[ Storage Engine Exception; sense_reason %d\n",
1737 sense_reason);
1738 target_show_cmd("-----[ ", cmd);
c66ac9db 1739
c66ac9db
NB		 1740 /*
1741 * For SAM Task Attribute emulation for failed struct se_cmd
1742 */
019c4ca6 1743 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1744 /*
1745 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1746 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1747 */
1748 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1749 cmd->transport_complete_callback)
057085e5 1750 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1751
de103c93 1752 switch (sense_reason) {
03e98c9e
NB		 1753 case TCM_NON_EXISTENT_LUN:
1754 case TCM_UNSUPPORTED_SCSI_OPCODE:
1755 case TCM_INVALID_CDB_FIELD:
1756 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1757 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1758 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1759 case TCM_UNKNOWN_MODE_PAGE:
1760 case TCM_WRITE_PROTECTED:
e2397c70 1761 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1762 case TCM_CHECK_CONDITION_ABORT_CMD:
1763 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1764 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1765 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1766 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1767 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
449a1378 1768 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
e8642120
DD		 1769 case TCM_TOO_MANY_TARGET_DESCS:
1770 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE:
1771 case TCM_TOO_MANY_SEGMENT_DESCS:
1772 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE:
c66ac9db 1773 break;
de103c93
CH		 1774 case TCM_OUT_OF_RESOURCES:
1775 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1776 break;
03e98c9e 1777 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1778 /*
1779 * No SENSE Data payload for this case, set SCSI Status
1780 * and queue the response to $FABRIC_MOD.
1781 *
1782 * Uses linux/include/scsi/scsi.h SAM status codes defs
1783 */
1784 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1785 /*
1786 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1787 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1788 * CONFLICT STATUS.
1789 *
1790 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1791 */
e3d6f909 1792 if (cmd->se_sess &&
c51c8e7b
HR		 1793 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1794 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1795 cmd->orig_fe_lun, 0x2C,
1796 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1797 }
e5c0d6ad 1798 trace_target_cmd_complete(cmd);
c51c8e7b 1799 ret = cmd->se_tfo->queue_status(cmd);
fa7e25cf 1800 if (ret)
07bde79a 1801 goto queue_full;
c66ac9db 1802 goto check_stop;
c66ac9db 1803 default:
6708bb27 1804 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1805 cmd->t_task_cdb[0], sense_reason);
1806 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1807 break;
1808 }
f3146437 1809
de103c93 1810 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
fa7e25cf 1811 if (ret)
03e98c9e 1812 goto queue_full;
07bde79a 1813
c66ac9db
NB		 1814check_stop:
1815 transport_lun_remove_cmd(cmd);
06b967e4 1816 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1817 return;
1818
1819queue_full:
fa7e25cf 1820 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db 1821}
2fbff127 1822EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1823
dff0ca9e 1824void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
c66ac9db 1825{
de103c93 1826 sense_reason_t ret;
5f41a31d 1827
dff0ca9e
NB		 1828 if (!cmd->execute_cmd) {
1829 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1830 goto err;
1831 }
1832 if (do_checks) {
1833 /*
1834 * Check for an existing UNIT ATTENTION condition after
1835 * target_handle_task_attr() has done SAM task attr
1836 * checking, and possibly have already defered execution
1837 * out to target_restart_delayed_cmds() context.
1838 */
1839 ret = target_scsi3_ua_check(cmd);
1840 if (ret)
1841 goto err;
1842
1843 ret = target_alua_state_check(cmd);
1844 if (ret)
1845 goto err;
5f41a31d 1846
dff0ca9e
NB		 1847 ret = target_check_reservation(cmd);
1848 if (ret) {
1849 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1850 goto err;
de103c93 1851 }
5f41a31d 1852 }
dff0ca9e
NB		 1853
1854 ret = cmd->execute_cmd(cmd);
1855 if (!ret)
1856 return;
1857err:
1858 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1859 cmd->transport_state &= ~CMD_T_SENT;
dff0ca9e
NB		 1860 spin_unlock_irq(&cmd->t_state_lock);
1861
1862 transport_generic_request_failure(cmd, ret);
5f41a31d
CH		 1863}
1864
aa58b531
NB		 1865static int target_write_prot_action(struct se_cmd *cmd)
1866{
5132d1e6 1867 u32 sectors;
aa58b531
NB		 1868 /*
1869 * Perform WRITE_INSERT of PI using software emulation when backend
1870 * device has PI enabled, if the transport has not already generated
1871 * PI using hardware WRITE_INSERT offload.
1872 */
1873 switch (cmd->prot_op) {
1874 case TARGET_PROT_DOUT_INSERT:
1875 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1876 sbc_dif_generate(cmd);
1877 break;
5132d1e6
NB		 1878 case TARGET_PROT_DOUT_STRIP:
1879 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1880 break;
1881
1882 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1883 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1884 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1885 if (unlikely(cmd->pi_err)) {
1886 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1887 cmd->transport_state &= ~CMD_T_SENT;
5132d1e6
NB		 1888 spin_unlock_irq(&cmd->t_state_lock);
1889 transport_generic_request_failure(cmd, cmd->pi_err);
1890 return -1;
1891 }
1892 break;
aa58b531
NB		 1893 default:
1894 break;
1895 }
1896
1897 return 0;
1898}
1899
019c4ca6 1900static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1901{
1902 struct se_device *dev = cmd->se_dev;
1903
a3541703 1904 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1905 return false;
5f41a31d 1906
410c29df
NB		 1907 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1908
c66ac9db 1909 /*
25985edc 1910 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1911 * to allow the passed struct se_cmd list of tasks to the front of the list.
1912 */
5f41a31d 1913 switch (cmd->sam_task_attr) {
68d81f40 1914 case TCM_HEAD_TAG:
9c31820b
RD		 1915 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1916 cmd->t_task_cdb[0]);
019c4ca6 1917 return false;
68d81f40 1918 case TCM_ORDERED_TAG:
33940d09 1919 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1920
9c31820b
RD		 1921 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1922 cmd->t_task_cdb[0]);
5f41a31d 1923
c66ac9db 1924 /*
5f41a31d
CH		 1925 * Execute an ORDERED command if no other older commands
1926 * exist that need to be completed first.
c66ac9db 1927 */
5f41a31d 1928 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1929 return false;
5f41a31d
CH		 1930 break;
1931 default:
c66ac9db
NB		 1932 /*
1933 * For SIMPLE and UNTAGGED Task Attribute commands
1934 */
33940d09 1935 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1936 break;
c66ac9db 1937 }
5f41a31d 1938
019c4ca6
CH		 1939 if (atomic_read(&dev->dev_ordered_sync) == 0)
1940 return false;
c66ac9db 1941
019c4ca6
CH		 1942 spin_lock(&dev->delayed_cmd_lock);
1943 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1944 spin_unlock(&dev->delayed_cmd_lock);
1945
9c31820b
RD		 1946 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1947 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1948 return true;
1949}
1950
310d3d31
NB		 1951static int __transport_check_aborted_status(struct se_cmd *, int);
1952
019c4ca6
CH		 1953void target_execute_cmd(struct se_cmd *cmd)
1954{
019c4ca6
CH		 1955 /*
1956 * Determine if frontend context caller is requesting the stopping of
1957 * this command for frontend exceptions.
310d3d31
NB		 1958 *
1959 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1960 */
4a9a6c8d 1961 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1962 if (__transport_check_aborted_status(cmd, 1)) {
1963 spin_unlock_irq(&cmd->t_state_lock);
1964 return;
1965 }
019c4ca6 1966 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1967 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1968 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1969
1970 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1971 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1972 return;
1973 }
1974
1975 cmd->t_state = TRANSPORT_PROCESSING;
fd5e64de 1976 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
019c4ca6 1977 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1978
1979 if (target_write_prot_action(cmd))
1980 return;
019c4ca6 1981
1a398b97
NB		 1982 if (target_handle_task_attr(cmd)) {
1983 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1984 cmd->transport_state &= ~CMD_T_SENT;
1a398b97
NB		 1985 spin_unlock_irq(&cmd->t_state_lock);
1986 return;
1987 }
1988
dff0ca9e 1989 __target_execute_cmd(cmd, true);
c66ac9db 1990}
70baf0ab 1991EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1992
5f41a31d
CH		 1993/*
1994 * Process all commands up to the last received ORDERED task attribute which
1995 * requires another blocking boundary
1996 */
1997static void target_restart_delayed_cmds(struct se_device *dev)
1998{
1999 for (;;) {
2000 struct se_cmd *cmd;
2001
2002 spin_lock(&dev->delayed_cmd_lock);
2003 if (list_empty(&dev->delayed_cmd_list)) {
2004 spin_unlock(&dev->delayed_cmd_lock);
2005 break;
2006 }
2007
2008 cmd = list_entry(dev->delayed_cmd_list.next,
2009 struct se_cmd, se_delayed_node);
2010 list_del(&cmd->se_delayed_node);
2011 spin_unlock(&dev->delayed_cmd_lock);
2012
dff0ca9e 2013 __target_execute_cmd(cmd, true);
5f41a31d 2014
68d81f40 2015 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 2016 break;
2017 }
2018}
2019
c66ac9db 2020/*
35e0e757 2021 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 2022 * and ordered cmds need to have their tasks added to the execution queue.
2023 */
2024static void transport_complete_task_attr(struct se_cmd *cmd)
2025{
5951146d 2026 struct se_device *dev = cmd->se_dev;
c66ac9db 2027
a3541703 2028 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 2029 return;
2030
410c29df
NB		 2031 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
2032 goto restart;
2033
68d81f40 2034 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 2035 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 2036 dev->dev_cur_ordered_id++;
68d81f40 2037 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 2038 dev->dev_cur_ordered_id++;
9c31820b
RD		 2039 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
2040 dev->dev_cur_ordered_id);
68d81f40 2041 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 2042 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 2043
2044 dev->dev_cur_ordered_id++;
9c31820b
RD		 2045 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
2046 dev->dev_cur_ordered_id);
c66ac9db 2047 }
410c29df 2048restart:
5f41a31d 2049 target_restart_delayed_cmds(dev);
c66ac9db
NB		 2050}
2051
e057f533 2052static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 2053{
2054 int ret = 0;
2055
019c4ca6 2056 transport_complete_task_attr(cmd);
fa7e25cf
NB		 2057 /*
2058 * If a fabric driver ->write_pending() or ->queue_data_in() callback
2059 * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and
2060 * the same callbacks should not be retried. Return CHECK_CONDITION
2061 * if a scsi_status is not already set.
2062 *
2063 * If a fabric driver ->queue_status() has returned non zero, always
2064 * keep retrying no matter what..
2065 */
2066 if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) {
2067 if (cmd->scsi_status)
2068 goto queue_status;
e057f533 2069
fa7e25cf
NB		 2070 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2071 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2072 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2073 translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
2074 goto queue_status;
e057f533 2075 }
07bde79a 2076
fa7e25cf
NB		 2077 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
2078 goto queue_status;
2079
07bde79a
NB		 2080 switch (cmd->data_direction) {
2081 case DMA_FROM_DEVICE:
4347ab5a
NB		 2082 if (cmd->scsi_status)
2083 goto queue_status;
2084
e5c0d6ad 2085 trace_target_cmd_complete(cmd);
07bde79a
NB		 2086 ret = cmd->se_tfo->queue_data_in(cmd);
2087 break;
2088 case DMA_TO_DEVICE:
64577407 2089 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 2090 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 2091 break;
07bde79a
NB		 2092 }
2093 /* Fall through for DMA_TO_DEVICE */
2094 case DMA_NONE:
4347ab5a 2095queue_status:
e5c0d6ad 2096 trace_target_cmd_complete(cmd);
07bde79a
NB		 2097 ret = cmd->se_tfo->queue_status(cmd);
2098 break;
2099 default:
2100 break;
2101 }
2102
e057f533 2103 if (ret < 0) {
fa7e25cf 2104 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
e057f533
CH		 2105 return;
2106 }
2107 transport_lun_remove_cmd(cmd);
2108 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2109}
2110
fa7e25cf
NB		 2111static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev,
2112 int err, bool write_pending)
07bde79a 2113{
fa7e25cf
NB		 2114 /*
2115 * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or
2116 * ->queue_data_in() callbacks from new process context.
2117 *
2118 * Otherwise for other errors, transport_complete_qf() will send
2119 * CHECK_CONDITION via ->queue_status() instead of attempting to
2120 * retry associated fabric driver data-transfer callbacks.
2121 */
2122 if (err == -EAGAIN || err == -ENOMEM) {
2123 cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP :
2124 TRANSPORT_COMPLETE_QF_OK;
2125 } else {
2126 pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err);
2127 cmd->t_state = TRANSPORT_COMPLETE_QF_ERR;
2128 }
2129
07bde79a 2130 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2131 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2132 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2133 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2134
2135 schedule_work(&cmd->se_dev->qf_work_queue);
2136}
2137
fdeab852 2138static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2139{
fdeab852
NB		 2140 switch (cmd->prot_op) {
2141 case TARGET_PROT_DIN_STRIP:
2142 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2143 u32 sectors = cmd->data_length >>
2144 ilog2(cmd->se_dev->dev_attrib.block_size);
2145
2146 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2147 sectors, 0, cmd->t_prot_sg,
2148 0);
2149 if (cmd->pi_err)
fdeab852 2150 return true;
bc005869 2151 }
fdeab852 2152 break;
72c03850
NB		 2153 case TARGET_PROT_DIN_INSERT:
2154 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2155 break;
2156
2157 sbc_dif_generate(cmd);
2158 break;
fdeab852
NB		 2159 default:
2160 break;
bc005869
NB		 2161 }
2162
2163 return false;
2164}
2165
35e0e757 2166static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2167{
35e0e757 2168 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2169 int ret;
35e0e757 2170
c66ac9db
NB		 2171 /*
2172 * Check if we need to move delayed/dormant tasks from cmds on the
2173 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2174 * Attribute.
2175 */
019c4ca6
CH		 2176 transport_complete_task_attr(cmd);
2177
07bde79a
NB		 2178 /*
2179 * Check to schedule QUEUE_FULL work, or execute an existing
2180 * cmd->transport_qf_callback()
2181 */
2182 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2183 schedule_work(&cmd->se_dev->qf_work_queue);
2184
c66ac9db 2185 /*
d5829eac 2186 * Check if we need to send a sense buffer from
c66ac9db
NB		 2187 * the struct se_cmd in question.
2188 */
2189 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2190 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2191 ret = transport_send_check_condition_and_sense(
2192 cmd, 0, 1);
fa7e25cf 2193 if (ret)
27a27099
PB		 2194 goto queue_full;
2195
2196 transport_lun_remove_cmd(cmd);
2197 transport_cmd_check_stop_to_fabric(cmd);
2198 return;
c66ac9db
NB		 2199 }
2200 /*
25985edc 2201 * Check for a callback, used by amongst other things
a6b0133c 2202 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2203 */
a6b0133c
NB		 2204 if (cmd->transport_complete_callback) {
2205 sense_reason_t rc;
057085e5
NB		 2206 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2207 bool zero_dl = !(cmd->data_length);
2208 int post_ret = 0;
a6b0133c 2209
057085e5
NB		 2210 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2211 if (!rc && !post_ret) {
2212 if (caw && zero_dl)
c8e63985
NB		 2213 goto queue_rsp;
2214
a6b0133c 2215 return;
a2890087
NB		 2216 } else if (rc) {
2217 ret = transport_send_check_condition_and_sense(cmd,
2218 rc, 0);
fa7e25cf 2219 if (ret)
a2890087 2220 goto queue_full;
a6b0133c 2221
a2890087
NB		 2222 transport_lun_remove_cmd(cmd);
2223 transport_cmd_check_stop_to_fabric(cmd);
2224 return;
2225 }
a6b0133c 2226 }
c66ac9db 2227
c8e63985 2228queue_rsp:
c66ac9db
NB		 2229 switch (cmd->data_direction) {
2230 case DMA_FROM_DEVICE:
4347ab5a
NB		 2231 if (cmd->scsi_status)
2232 goto queue_status;
2233
4cc987ea
NB		 2234 atomic_long_add(cmd->data_length,
2235 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2236 /*
2237 * Perform READ_STRIP of PI using software emulation when
2238 * backend had PI enabled, if the transport will not be
2239 * performing hardware READ_STRIP offload.
2240 */
fdeab852 2241 if (target_read_prot_action(cmd)) {
bc005869
NB		 2242 ret = transport_send_check_condition_and_sense(cmd,
2243 cmd->pi_err, 0);
fa7e25cf 2244 if (ret)
bc005869
NB		 2245 goto queue_full;
2246
2247 transport_lun_remove_cmd(cmd);
2248 transport_cmd_check_stop_to_fabric(cmd);
2249 return;
2250 }
c66ac9db 2251
e5c0d6ad 2252 trace_target_cmd_complete(cmd);
07bde79a 2253 ret = cmd->se_tfo->queue_data_in(cmd);
fa7e25cf 2254 if (ret)
07bde79a 2255 goto queue_full;
c66ac9db
NB		 2256 break;
2257 case DMA_TO_DEVICE:
4cc987ea
NB		 2258 atomic_long_add(cmd->data_length,
2259 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2260 /*
2261 * Check if we need to send READ payload for BIDI-COMMAND
2262 */
64577407 2263 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2264 atomic_long_add(cmd->data_length,
2265 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2266 ret = cmd->se_tfo->queue_data_in(cmd);
fa7e25cf 2267 if (ret)
07bde79a 2268 goto queue_full;
c66ac9db
NB		 2269 break;
2270 }
2271 /* Fall through for DMA_TO_DEVICE */
2272 case DMA_NONE:
4347ab5a 2273queue_status:
e5c0d6ad 2274 trace_target_cmd_complete(cmd);
07bde79a 2275 ret = cmd->se_tfo->queue_status(cmd);
fa7e25cf 2276 if (ret)
07bde79a 2277 goto queue_full;
c66ac9db
NB		 2278 break;
2279 default:
2280 break;
2281 }
2282
2283 transport_lun_remove_cmd(cmd);
2284 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2285 return;
2286
2287queue_full:
6708bb27 2288 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2289 " data_direction: %d\n", cmd, cmd->data_direction);
fa7e25cf
NB		 2290
2291 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 2292}
2293
e64aa657 2294void target_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2295{
ec98f782 2296 struct scatterlist *sg;
ec98f782 2297 int count;
c66ac9db 2298
6708bb27
AG		 2299 for_each_sg(sgl, sg, nents, count)
2300 __free_page(sg_page(sg));
c66ac9db 2301
6708bb27
AG		 2302 kfree(sgl);
2303}
e64aa657 2304EXPORT_SYMBOL(target_free_sgl);
c66ac9db 2305
47e459e6
NB		 2306static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2307{
2308 /*
2309 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2310 * emulation, and free + reset pointers if necessary..
2311 */
2312 if (!cmd->t_data_sg_orig)
2313 return;
2314
2315 kfree(cmd->t_data_sg);
2316 cmd->t_data_sg = cmd->t_data_sg_orig;
2317 cmd->t_data_sg_orig = NULL;
2318 cmd->t_data_nents = cmd->t_data_nents_orig;
2319 cmd->t_data_nents_orig = 0;
2320}
2321
6708bb27
AG		 2322static inline void transport_free_pages(struct se_cmd *cmd)
2323{
5835812f 2324 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
e64aa657 2325 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
5835812f
AM		 2326 cmd->t_prot_sg = NULL;
2327 cmd->t_prot_nents = 0;
2328 }
2329
47e459e6 2330 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2331 /*
2332 * Release special case READ buffer payload required for
2333 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2334 */
2335 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
e64aa657 2336 target_free_sgl(cmd->t_bidi_data_sg,
c8e63985
NB		 2337 cmd->t_bidi_data_nents);
2338 cmd->t_bidi_data_sg = NULL;
2339 cmd->t_bidi_data_nents = 0;
2340 }
47e459e6 2341 transport_reset_sgl_orig(cmd);
6708bb27 2342 return;
47e459e6
NB		 2343 }
2344 transport_reset_sgl_orig(cmd);
6708bb27 2345
e64aa657 2346 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2347 cmd->t_data_sg = NULL;
2348 cmd->t_data_nents = 0;
c66ac9db 2349
e64aa657 2350 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2351 cmd->t_bidi_data_sg = NULL;
2352 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2353}
2354
e26d99ae 2355/**
febe562c
NB		 2356 * transport_put_cmd - release a reference to a command
2357 * @cmd: command to release
e26d99ae 2358 *
febe562c 2359 * This routine releases our reference to the command and frees it if possible.
e26d99ae 2360 */
febe562c 2361static int transport_put_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2362{
2363 BUG_ON(!cmd->se_tfo);
e26d99ae 2364 /*
7481deb4
NB		 2365 * If this cmd has been setup with target_get_sess_cmd(), drop
2366 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2367 */
afc16604 2368 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2369}
2370
4949314c 2371void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2372{
ec98f782 2373 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2374 struct page **pages;
2375 int i;
05d1c7c0
AG		 2376
2377 /*
ec98f782
AG		 2378 * We need to take into account a possible offset here for fabrics like
2379 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2380 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2381 */
4949314c
AG		 2382 if (!cmd->t_data_nents)
2383 return NULL;
3717ef0c
PB		 2384
2385 BUG_ON(!sg);
2386 if (cmd->t_data_nents == 1)
4949314c
AG		 2387 return kmap(sg_page(sg)) + sg->offset;
2388
2389 /* >1 page. use vmap */
df6751f3 2390 pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL);
de103c93 2391 if (!pages)
4949314c
AG		 2392 return NULL;
2393
2394 /* convert sg[] to pages[] */
2395 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2396 pages[i] = sg_page(sg);
2397 }
2398
2399 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2400 kfree(pages);
de103c93 2401 if (!cmd->t_data_vmap)
4949314c
AG		 2402 return NULL;
2403
2404 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2405}
4949314c 2406EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2407
4949314c 2408void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2409{
a1edf9cf 2410 if (!cmd->t_data_nents) {
4949314c 2411 return;
a1edf9cf 2412 } else if (cmd->t_data_nents == 1) {
4949314c 2413 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2414 return;
2415 }
4949314c
AG		 2416
2417 vunmap(cmd->t_data_vmap);
2418 cmd->t_data_vmap = NULL;
05d1c7c0 2419}
4949314c 2420EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2421
c5ff8d6b 2422int
20093994 2423target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
e64aa657 2424 bool zero_page, bool chainable)
c66ac9db 2425{
20093994 2426 struct scatterlist *sg;
ec98f782 2427 struct page *page;
20093994 2428 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
e64aa657 2429 unsigned int nalloc, nent;
ec98f782 2430 int i = 0;
c66ac9db 2431
e64aa657
CH		 2432 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2433 if (chainable)
2434 nalloc++;
2435 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
20093994 2436 if (!sg)
ec98f782 2437 return -ENOMEM;
c66ac9db 2438
e64aa657 2439 sg_init_table(sg, nalloc);
9db9da33 2440
ec98f782
AG		 2441 while (length) {
2442 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2443 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2444 if (!page)
2445 goto out;
c66ac9db 2446
20093994 2447 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2448 length -= page_len;
2449 i++;
c66ac9db 2450 }
20093994
NB		 2451 *sgl = sg;
2452 *nents = nent;
c66ac9db 2453 return 0;
c66ac9db 2454
ec98f782 2455out:
d0e27c88 2456 while (i > 0) {
ec98f782 2457 i--;
20093994 2458 __free_page(sg_page(&sg[i]));
c66ac9db 2459 }
20093994 2460 kfree(sg);
ec98f782 2461 return -ENOMEM;
c66ac9db 2462}
e64aa657 2463EXPORT_SYMBOL(target_alloc_sgl);
c66ac9db 2464
da0f7619 2465/*
b16a35b0
AG		 2466 * Allocate any required resources to execute the command. For writes we
2467 * might not have the payload yet, so notify the fabric via a call to
2468 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2469 */
de103c93
CH		 2470sense_reason_t
2471transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2472{
b1a2ecda 2473 unsigned long flags;
c66ac9db 2474 int ret = 0;
c8e63985 2475 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2476
5835812f
AM		 2477 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2478 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2479 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
e64aa657 2480 cmd->prot_length, true, false);
5835812f
AM		 2481 if (ret < 0)
2482 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2483 }
2484
c66ac9db
NB		 2485 /*
2486 * Determine is the TCM fabric module has already allocated physical
2487 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2488 * beforehand.
c66ac9db 2489 */
ec98f782
AG		 2490 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2491 cmd->data_length) {
20093994 2492
8cefe07b
NB		 2493 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2494 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2495 u32 bidi_length;
2496
2497 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2498 bidi_length = cmd->t_task_nolb *
2499 cmd->se_dev->dev_attrib.block_size;
2500 else
2501 bidi_length = cmd->data_length;
2502
2503 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2504 &cmd->t_bidi_data_nents,
e64aa657 2505 bidi_length, zero_flag, false);
8cefe07b
NB		 2506 if (ret < 0)
2507 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2508 }
2509
20093994 2510 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
e64aa657 2511 cmd->data_length, zero_flag, false);
c66ac9db 2512 if (ret < 0)
de103c93 2513 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2514 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2515 cmd->data_length) {
2516 /*
2517 * Special case for COMPARE_AND_WRITE with fabrics
2518 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2519 */
2520 u32 caw_length = cmd->t_task_nolb *
2521 cmd->se_dev->dev_attrib.block_size;
2522
2523 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2524 &cmd->t_bidi_data_nents,
e64aa657 2525 caw_length, zero_flag, false);
c8e63985
NB		 2526 if (ret < 0)
2527 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2528 }
c66ac9db 2529 /*
c3196f0c
CH		 2530 * If this command is not a write we can execute it right here,
2531 * for write buffers we need to notify the fabric driver first
2532 * and let it call back once the write buffers are ready.
c66ac9db 2533 */
5f41a31d 2534 target_add_to_state_list(cmd);
885e7b0e 2535 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2536 target_execute_cmd(cmd);
2537 return 0;
2538 }
b1a2ecda
BVA		 2539
2540 spin_lock_irqsave(&cmd->t_state_lock, flags);
2541 cmd->t_state = TRANSPORT_WRITE_PENDING;
2542 /*
2543 * Determine if frontend context caller is requesting the stopping of
2544 * this command for frontend exceptions.
2545 */
2546 if (cmd->transport_state & CMD_T_STOP) {
2547 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
2548 __func__, __LINE__, cmd->tag);
2549
2550 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2551
2552 complete_all(&cmd->t_transport_stop_comp);
a5eb307f 2553 return 0;
b1a2ecda
BVA		 2554 }
2555 cmd->transport_state &= ~CMD_T_ACTIVE;
2556 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c3196f0c
CH		 2557
2558 ret = cmd->se_tfo->write_pending(cmd);
fa7e25cf 2559 if (ret)
c3196f0c
CH		 2560 goto queue_full;
2561
fa7e25cf 2562 return 0;
da0f7619 2563
c3196f0c
CH		 2564queue_full:
2565 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
fa7e25cf 2566 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
c3196f0c 2567 return 0;
c66ac9db 2568}
a1d8b49a 2569EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2570
e057f533 2571static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2572{
f147abb4
NB		 2573 int ret;
2574
2575 ret = cmd->se_tfo->write_pending(cmd);
fa7e25cf 2576 if (ret) {
e057f533
CH		 2577 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2578 cmd);
fa7e25cf 2579 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
e057f533 2580 }
07bde79a
NB		 2581}
2582
0f4a9431
NB		 2583static bool
2584__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2585 unsigned long *flags);
2586
2587static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2588{
2589 unsigned long flags;
2590
2591 spin_lock_irqsave(&cmd->t_state_lock, flags);
2592 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2593 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2594}
2595
d5ddad41 2596int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2597{
d5ddad41 2598 int ret = 0;
0f4a9431 2599 bool aborted = false, tas = false;
d5ddad41 2600
d14921d6 2601 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2602 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2603 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2604
0f4a9431
NB		 2605 if (!aborted || tas)
2606 ret = transport_put_cmd(cmd);
d14921d6
NB		 2607 } else {
2608 if (wait_for_tasks)
0f4a9431 2609 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2610 /*
2611 * Handle WRITE failure case where transport_generic_new_cmd()
2612 * has already added se_cmd to state_list, but fabric has
2613 * failed command before I/O submission.
2614 */
febe562c 2615 if (cmd->state_active)
c130480b 2616 target_remove_from_state_list(cmd);
d14921d6 2617
82f1c8a4 2618 if (cmd->se_lun)
c66ac9db 2619 transport_lun_remove_cmd(cmd);
c66ac9db 2620
0f4a9431
NB		 2621 if (!aborted || tas)
2622 ret = transport_put_cmd(cmd);
2623 }
2624 /*
2625 * If the task has been internally aborted due to TMR ABORT_TASK
2626 * or LUN_RESET, target_core_tmr.c is responsible for performing
2627 * the remaining calls to target_put_sess_cmd(), and not the
2628 * callers of this function.
2629 */
2630 if (aborted) {
2631 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2632 wait_for_completion(&cmd->cmd_wait_comp);
2633 cmd->se_tfo->release_cmd(cmd);
2634 ret = 1;
c66ac9db 2635 }
d5ddad41 2636 return ret;
c66ac9db
NB		 2637}
2638EXPORT_SYMBOL(transport_generic_free_cmd);
2639
a17f091d 2640/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2641 * @se_cmd: command descriptor to add
a6360785 2642 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2643 */
afc16604 2644int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2645{
afc16604 2646 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2647 unsigned long flags;
bc187ea6 2648 int ret = 0;
a17f091d 2649
a6360785
NB		 2650 /*
2651 * Add a second kref if the fabric caller is expecting to handle
2652 * fabric acknowledgement that requires two target_put_sess_cmd()
2653 * invocations before se_cmd descriptor release.
2654 */
527268df 2655 if (ack_kref) {
1b4c59b7
HR		 2656 if (!kref_get_unless_zero(&se_cmd->cmd_kref))
2657 return -EINVAL;
2658
527268df
NB		 2659 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2660 }
7481deb4 2661
a17f091d 2662 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2663 if (se_sess->sess_tearing_down) {
2664 ret = -ESHUTDOWN;
2665 goto out;
2666 }
a17f091d 2667 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2668out:
a17f091d 2669 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2670
2671 if (ret && ack_kref)
afc16604 2672 target_put_sess_cmd(se_cmd);
7544e597 2673
bc187ea6 2674 return ret;
a17f091d 2675}
20361e69 2676EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2677
febe562c
NB		 2678static void target_free_cmd_mem(struct se_cmd *cmd)
2679{
2680 transport_free_pages(cmd);
2681
2682 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2683 core_tmr_release_req(cmd->se_tmr_req);
2684 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2685 kfree(cmd->t_task_cdb);
2686}
2687
7481deb4 2688static void target_release_cmd_kref(struct kref *kref)
a17f091d 2689{
7481deb4
NB		 2690 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2691 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2692 unsigned long flags;
0f4a9431 2693 bool fabric_stop;
a17f091d 2694
6b6427b6
BVA		 2695 if (se_sess) {
2696 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2697
2698 spin_lock(&se_cmd->t_state_lock);
2699 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2700 (se_cmd->transport_state & CMD_T_ABORTED);
2701 spin_unlock(&se_cmd->t_state_lock);
2702
2703 if (se_cmd->cmd_wait_set || fabric_stop) {
2704 list_del_init(&se_cmd->se_cmd_list);
2705 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2706 target_free_cmd_mem(se_cmd);
2707 complete(&se_cmd->cmd_wait_comp);
2708 return;
2709 }
0f4a9431 2710 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2711 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2712 }
a17f091d 2713
febe562c 2714 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2715 se_cmd->se_tfo->release_cmd(se_cmd);
2716}
2717
6b6427b6
BVA		 2718/**
2719 * target_put_sess_cmd - decrease the command reference count
2720 * @se_cmd: command to drop a reference from
2721 *
2722 * Returns 1 if and only if this target_put_sess_cmd() call caused the
2723 * refcount to drop to zero. Returns zero otherwise.
7481deb4 2724 */
afc16604 2725int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2726{
9ff9d15e 2727 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2728}
2729EXPORT_SYMBOL(target_put_sess_cmd);
2730
c00e6220
BVA		 2731static const char *data_dir_name(enum dma_data_direction d)
2732{
2733 switch (d) {
2734 case DMA_BIDIRECTIONAL: return "BIDI";
2735 case DMA_TO_DEVICE: return "WRITE";
2736 case DMA_FROM_DEVICE: return "READ";
2737 case DMA_NONE: return "NONE";
2738 }
2739
2740 return "(?)";
2741}
2742
2743static const char *cmd_state_name(enum transport_state_table t)
2744{
2745 switch (t) {
2746 case TRANSPORT_NO_STATE: return "NO_STATE";
2747 case TRANSPORT_NEW_CMD: return "NEW_CMD";
2748 case TRANSPORT_WRITE_PENDING: return "WRITE_PENDING";
2749 case TRANSPORT_PROCESSING: return "PROCESSING";
2750 case TRANSPORT_COMPLETE: return "COMPLETE";
2751 case TRANSPORT_ISTATE_PROCESSING:
2752 return "ISTATE_PROCESSING";
2753 case TRANSPORT_COMPLETE_QF_WP: return "COMPLETE_QF_WP";
2754 case TRANSPORT_COMPLETE_QF_OK: return "COMPLETE_QF_OK";
2755 case TRANSPORT_COMPLETE_QF_ERR: return "COMPLETE_QF_ERR";
2756 }
2757
2758 return "(?)";
2759}
2760
2761static void target_append_str(char **str, const char *txt)
2762{
2763 char *prev = *str;
2764
2765 *str = *str ? kasprintf(GFP_ATOMIC, "%s,%s", *str, txt) :
2766 kstrdup(txt, GFP_ATOMIC);
2767 kfree(prev);
2768}
2769
2770/*
2771 * Convert a transport state bitmask into a string. The caller is
2772 * responsible for freeing the returned pointer.
2773 */
2774static char *target_ts_to_str(u32 ts)
2775{
2776 char *str = NULL;
2777
2778 if (ts & CMD_T_ABORTED)
2779 target_append_str(&str, "aborted");
2780 if (ts & CMD_T_ACTIVE)
2781 target_append_str(&str, "active");
2782 if (ts & CMD_T_COMPLETE)
2783 target_append_str(&str, "complete");
2784 if (ts & CMD_T_SENT)
2785 target_append_str(&str, "sent");
2786 if (ts & CMD_T_STOP)
2787 target_append_str(&str, "stop");
2788 if (ts & CMD_T_FABRIC_STOP)
2789 target_append_str(&str, "fabric_stop");
2790
2791 return str;
2792}
2793
2794static const char *target_tmf_name(enum tcm_tmreq_table tmf)
2795{
2796 switch (tmf) {
2797 case TMR_ABORT_TASK: return "ABORT_TASK";
2798 case TMR_ABORT_TASK_SET: return "ABORT_TASK_SET";
2799 case TMR_CLEAR_ACA: return "CLEAR_ACA";
2800 case TMR_CLEAR_TASK_SET: return "CLEAR_TASK_SET";
2801 case TMR_LUN_RESET: return "LUN_RESET";
2802 case TMR_TARGET_WARM_RESET: return "TARGET_WARM_RESET";
2803 case TMR_TARGET_COLD_RESET: return "TARGET_COLD_RESET";
2804 case TMR_UNKNOWN: break;
2805 }
2806 return "(?)";
2807}
2808
2809void target_show_cmd(const char *pfx, struct se_cmd *cmd)
2810{
2811 char *ts_str = target_ts_to_str(cmd->transport_state);
2812 const u8 *cdb = cmd->t_task_cdb;
2813 struct se_tmr_req *tmf = cmd->se_tmr_req;
2814
2815 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2816 pr_debug("%scmd %#02x:%#02x with tag %#llx dir %s i_state %d t_state %s len %d refcnt %d transport_state %s\n",
2817 pfx, cdb[0], cdb[1], cmd->tag,
2818 data_dir_name(cmd->data_direction),
2819 cmd->se_tfo->get_cmd_state(cmd),
2820 cmd_state_name(cmd->t_state), cmd->data_length,
2821 kref_read(&cmd->cmd_kref), ts_str);
2822 } else {
2823 pr_debug("%stmf %s with tag %#llx ref_task_tag %#llx i_state %d t_state %s refcnt %d transport_state %s\n",
2824 pfx, target_tmf_name(tmf->function), cmd->tag,
2825 tmf->ref_task_tag, cmd->se_tfo->get_cmd_state(cmd),
2826 cmd_state_name(cmd->t_state),
2827 kref_read(&cmd->cmd_kref), ts_str);
2828 }
2829 kfree(ts_str);
2830}
2831EXPORT_SYMBOL(target_show_cmd);
2832
1c7b13fe
RD		 2833/* target_sess_cmd_list_set_waiting - Flag all commands in
2834 * sess_cmd_list to complete cmd_wait_comp. Set
2835 * sess_tearing_down so no more commands are queued.
2836 * @se_sess: session to flag
a17f091d 2837 */
1c7b13fe 2838void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d 2839{
1b4c59b7 2840 struct se_cmd *se_cmd, *tmp_cmd;
a17f091d 2841 unsigned long flags;
0f4a9431 2842 int rc;
a17f091d 2843
a17f091d 2844 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2845 if (se_sess->sess_tearing_down) {
2846 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2847 return;
2848 }
1c7b13fe 2849 se_sess->sess_tearing_down = 1;
9b31a328 2850 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2851
1b4c59b7
HR		 2852 list_for_each_entry_safe(se_cmd, tmp_cmd,
2853 &se_sess->sess_wait_list, se_cmd_list) {
0f4a9431
NB		 2854 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2855 if (rc) {
2856 se_cmd->cmd_wait_set = 1;
2857 spin_lock(&se_cmd->t_state_lock);
2858 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2859 spin_unlock(&se_cmd->t_state_lock);
1b4c59b7
HR		 2860 } else
2861 list_del_init(&se_cmd->se_cmd_list);
0f4a9431 2862 }
a17f091d
NB		 2863
2864 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2865}
1c7b13fe 2866EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2867
2868/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2869 * @se_sess: session to wait for active I/O
a17f091d 2870 */
be646c2d 2871void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2872{
2873 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2874 unsigned long flags;
0f4a9431 2875 bool tas;
a17f091d
NB		 2876
2877 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2878 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2879 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2880 " %d\n", se_cmd, se_cmd->t_state,
2881 se_cmd->se_tfo->get_cmd_state(se_cmd));
2882
0f4a9431
NB		 2883 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2884 tas = (se_cmd->transport_state & CMD_T_TAS);
2885 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2886
2887 if (!target_put_sess_cmd(se_cmd)) {
2888 if (tas)
2889 target_put_sess_cmd(se_cmd);
2890 }
2891
be646c2d
JE		 2892 wait_for_completion(&se_cmd->cmd_wait_comp);
2893 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2894 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2895 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2896
2897 se_cmd->se_tfo->release_cmd(se_cmd);
2898 }
9b31a328
NB		 2899
2900 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2901 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2902 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2903
a17f091d
NB		 2904}
2905EXPORT_SYMBOL(target_wait_for_sess_cmds);
2906
bd4e2d29
NB		 2907static void target_lun_confirm(struct percpu_ref *ref)
2908{
2909 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
2910
2911 complete(&lun->lun_ref_comp);
2912}
2913
b3eeea66 2914void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2915{
bd4e2d29
NB		 2916 /*
2917 * Mark the percpu-ref as DEAD, switch to atomic_t mode, drop
2918 * the initial reference and schedule confirm kill to be
2919 * executed after one full RCU grace period has completed.
2920 */
2921 percpu_ref_kill_and_confirm(&lun->lun_ref, target_lun_confirm);
2922 /*
2923 * The first completion waits for percpu_ref_switch_to_atomic_rcu()
2924 * to call target_lun_confirm after lun->lun_ref has been marked
2925 * as __PERCPU_REF_DEAD on all CPUs, and switches to atomic_t
2926 * mode so that percpu_ref_tryget_live() lookup of lun->lun_ref
2927 * fails for all new incoming I/O.
2928 */
5277797d 2929 wait_for_completion(&lun->lun_ref_comp);
bd4e2d29
NB		 2930 /*
2931 * The second completion waits for percpu_ref_put_many() to
2932 * invoke ->release() after lun->lun_ref has switched to
2933 * atomic_t mode, and lun->lun_ref.count has reached zero.
2934 *
2935 * At this point all target-core lun->lun_ref references have
2936 * been dropped via transport_lun_remove_cmd(), and it's safe
2937 * to proceed with the remaining LUN shutdown.
2938 */
2939 wait_for_completion(&lun->lun_shutdown_comp);
c66ac9db
NB		 2940}
2941
0f4a9431
NB		 2942static bool
2943__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2944 bool *aborted, bool *tas, unsigned long *flags)
2945 __releases(&cmd->t_state_lock)
2946 __acquires(&cmd->t_state_lock)
c66ac9db 2947{
c66ac9db 2948
0f4a9431
NB		 2949 assert_spin_locked(&cmd->t_state_lock);
2950 WARN_ON_ONCE(!irqs_disabled());
2951
2952 if (fabric_stop)
2953 cmd->transport_state |= CMD_T_FABRIC_STOP;
2954
2955 if (cmd->transport_state & CMD_T_ABORTED)
2956 *aborted = true;
2957
2958 if (cmd->transport_state & CMD_T_TAS)
2959 *tas = true;
2960
c8e31f26 2961 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2962 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2963 return false;
cb4f4d3c 2964
c8e31f26 2965 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2966 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2967 return false;
7d680f3b 2968
0f4a9431
NB		 2969 if (!(cmd->transport_state & CMD_T_ACTIVE))
2970 return false;
2971
2972 if (fabric_stop && *aborted)
a17f091d 2973 return false;
c66ac9db 2974
7d680f3b 2975 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2976
c00e6220 2977 target_show_cmd("wait_for_tasks: Stopping ", cmd);
c66ac9db 2978
0f4a9431 2979 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2980
c00e6220
BVA		 2981 while (!wait_for_completion_timeout(&cmd->t_transport_stop_comp,
2982 180 * HZ))
2983 target_show_cmd("wait for tasks: ", cmd);
c66ac9db 2984
0f4a9431 2985 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2986 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2987
0f4a9431
NB		 2988 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2989 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2990
0f4a9431
NB		 2991 return true;
2992}
2993
2994/**
2d4760ee
BVA		 2995 * transport_wait_for_tasks - set CMD_T_STOP and wait for t_transport_stop_comp
2996 * @cmd: command to wait on
0f4a9431
NB		 2997 */
2998bool transport_wait_for_tasks(struct se_cmd *cmd)
2999{
3000 unsigned long flags;
3001 bool ret, aborted = false, tas = false;
3002
3003 spin_lock_irqsave(&cmd->t_state_lock, flags);
3004 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 3005 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 3006
0f4a9431 3007 return ret;
c66ac9db 3008}
d14921d6 3009EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 3010
ab78fef4
BVA		 3011struct sense_info {
3012 u8 key;
3013 u8 asc;
3014 u8 ascq;
3015 bool add_sector_info;
3016};
3017
3018static const struct sense_info sense_info_table[] = {
3019 [TCM_NO_SENSE] = {
3020 .key = NOT_READY
3021 },
3022 [TCM_NON_EXISTENT_LUN] = {
3023 .key = ILLEGAL_REQUEST,
3024 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
3025 },
3026 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
3027 .key = ILLEGAL_REQUEST,
3028 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
3029 },
3030 [TCM_SECTOR_COUNT_TOO_MANY] = {
3031 .key = ILLEGAL_REQUEST,
3032 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
3033 },
3034 [TCM_UNKNOWN_MODE_PAGE] = {
3035 .key = ILLEGAL_REQUEST,
3036 .asc = 0x24, /* INVALID FIELD IN CDB */
3037 },
3038 [TCM_CHECK_CONDITION_ABORT_CMD] = {
3039 .key = ABORTED_COMMAND,
3040 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
3041 .ascq = 0x03,
3042 },
3043 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
3044 .key = ABORTED_COMMAND,
3045 .asc = 0x0c, /* WRITE ERROR */
3046 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
3047 },
3048 [TCM_INVALID_CDB_FIELD] = {
3049 .key = ILLEGAL_REQUEST,
3050 .asc = 0x24, /* INVALID FIELD IN CDB */
3051 },
3052 [TCM_INVALID_PARAMETER_LIST] = {
3053 .key = ILLEGAL_REQUEST,
3054 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
3055 },
e8642120
DD		 3056 [TCM_TOO_MANY_TARGET_DESCS] = {
3057 .key = ILLEGAL_REQUEST,
3058 .asc = 0x26,
3059 .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */
3060 },
3061 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = {
3062 .key = ILLEGAL_REQUEST,
3063 .asc = 0x26,
3064 .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */
3065 },
3066 [TCM_TOO_MANY_SEGMENT_DESCS] = {
3067 .key = ILLEGAL_REQUEST,
3068 .asc = 0x26,
3069 .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */
3070 },
3071 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = {
3072 .key = ILLEGAL_REQUEST,
3073 .asc = 0x26,
3074 .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */
3075 },
ab78fef4
BVA		 3076 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
3077 .key = ILLEGAL_REQUEST,
3078 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
3079 },
3080 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
3081 .key = ILLEGAL_REQUEST,
3082 .asc = 0x0c, /* WRITE ERROR */
3083 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
3084 },
3085 [TCM_SERVICE_CRC_ERROR] = {
3086 .key = ABORTED_COMMAND,
3087 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
3088 .ascq = 0x05, /* N/A */
3089 },
3090 [TCM_SNACK_REJECTED] = {
3091 .key = ABORTED_COMMAND,
3092 .asc = 0x11, /* READ ERROR */
3093 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
3094 },
3095 [TCM_WRITE_PROTECTED] = {
3096 .key = DATA_PROTECT,
3097 .asc = 0x27, /* WRITE PROTECTED */
3098 },
3099 [TCM_ADDRESS_OUT_OF_RANGE] = {
3100 .key = ILLEGAL_REQUEST,
3101 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
3102 },
3103 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
3104 .key = UNIT_ATTENTION,
3105 },
3106 [TCM_CHECK_CONDITION_NOT_READY] = {
3107 .key = NOT_READY,
3108 },
3109 [TCM_MISCOMPARE_VERIFY] = {
3110 .key = MISCOMPARE,
3111 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
3112 .ascq = 0x00,
3113 },
3114 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 3115 .key = ABORTED_COMMAND,
ab78fef4
BVA		 3116 .asc = 0x10,
3117 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
3118 .add_sector_info = true,
3119 },
3120 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 3121 .key = ABORTED_COMMAND,
ab78fef4
BVA		 3122 .asc = 0x10,
3123 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
3124 .add_sector_info = true,
3125 },
3126 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 3127 .key = ABORTED_COMMAND,
ab78fef4
BVA		 3128 .asc = 0x10,
3129 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
3130 .add_sector_info = true,
3131 },
449a1378
NB		 3132 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
3133 .key = COPY_ABORTED,
3134 .asc = 0x0d,
3135 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
3136
3137 },
ab78fef4
BVA		 3138 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
3139 /*
3140 * Returning ILLEGAL REQUEST would cause immediate IO errors on
3141 * Solaris initiators. Returning NOT READY instead means the
3142 * operations will be retried a finite number of times and we
3143 * can survive intermittent errors.
3144 */
3145 .key = NOT_READY,
3146 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
3147 },
3148};
3149
f5a8b3a7 3150static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 3151{
3152 const struct sense_info *si;
3153 u8 *buffer = cmd->sense_buffer;
3154 int r = (__force int)reason;
3155 u8 asc, ascq;
4e4937e8 3156 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 3157
3158 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
3159 si = &sense_info_table[r];
3160 else
3161 si = &sense_info_table[(__force int)
3162 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
3163
ab78fef4
BVA		 3164 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
3165 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3166 WARN_ON_ONCE(asc == 0);
3167 } else if (si->asc == 0) {
3168 WARN_ON_ONCE(cmd->scsi_asc == 0);
3169 asc = cmd->scsi_asc;
3170 ascq = cmd->scsi_ascq;
3171 } else {
3172 asc = si->asc;
3173 ascq = si->ascq;
3174 }
9ec1e1ce 3175
4e4937e8 3176 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 3177 if (si->add_sector_info)
f5a8b3a7
SG		 3178 return scsi_set_sense_information(buffer,
3179 cmd->scsi_sense_length,
3180 cmd->bad_sector);
3181
3182 return 0;
ab78fef4
BVA		 3183}
3184
de103c93
CH		 3185int
3186transport_send_check_condition_and_sense(struct se_cmd *cmd,
3187 sense_reason_t reason, int from_transport)
c66ac9db 3188{
c66ac9db 3189 unsigned long flags;
c66ac9db 3190
a1d8b49a 3191 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3192 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 3193 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3194 return 0;
3195 }
3196 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 3197 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3198
ab78fef4 3199 if (!from_transport) {
f5a8b3a7
SG		 3200 int rc;
3201
c66ac9db 3202 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 3203 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3204 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 3205 rc = translate_sense_reason(cmd, reason);
3206 if (rc)
3207 return rc;
c66ac9db 3208 }
c66ac9db 3209
e5c0d6ad 3210 trace_target_cmd_complete(cmd);
07bde79a 3211 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3212}
3213EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3214
310d3d31
NB		 3215static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3216 __releases(&cmd->t_state_lock)
3217 __acquires(&cmd->t_state_lock)
c66ac9db 3218{
fa7e25cf
NB		 3219 int ret;
3220
310d3d31
NB		 3221 assert_spin_locked(&cmd->t_state_lock);
3222 WARN_ON_ONCE(!irqs_disabled());
3223
c18bc7d8
RD		 3224 if (!(cmd->transport_state & CMD_T_ABORTED))
3225 return 0;
68259b5a
AL		 3226 /*
3227 * If cmd has been aborted but either no status is to be sent or it has
3228 * already been sent, just return
3229 */
310d3d31
NB		 3230 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
3231 if (send_status)
3232 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 3233 return 1;
310d3d31 3234 }
8b1e1244 3235
310d3d31
NB		 3236 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
3237 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3238
68259b5a 3239 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 3240 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 3241 trace_target_cmd_complete(cmd);
310d3d31
NB		 3242
3243 spin_unlock_irq(&cmd->t_state_lock);
fa7e25cf
NB		 3244 ret = cmd->se_tfo->queue_status(cmd);
3245 if (ret)
3246 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
310d3d31 3247 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 3248
3249 return 1;
c66ac9db 3250}
310d3d31
NB		 3251
3252int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3253{
3254 int ret;
3255
3256 spin_lock_irq(&cmd->t_state_lock);
3257 ret = __transport_check_aborted_status(cmd, send_status);
3258 spin_unlock_irq(&cmd->t_state_lock);
3259
3260 return ret;
3261}
c66ac9db
NB		 3262EXPORT_SYMBOL(transport_check_aborted_status);
3263
3264void transport_send_task_abort(struct se_cmd *cmd)
3265{
c252f003 3266 unsigned long flags;
fa7e25cf 3267 int ret;
c252f003
NB		 3268
3269 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 3270 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 3271 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3272 return;
3273 }
3274 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3275
c66ac9db
NB		 3276 /*
3277 * If there are still expected incoming fabric WRITEs, we wait
3278 * until until they have completed before sending a TASK_ABORTED
3279 * response. This response with TASK_ABORTED status will be
3280 * queued back to fabric module by transport_check_aborted_status().
3281 */
3282 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3283 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 3284 spin_lock_irqsave(&cmd->t_state_lock, flags);
3285 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3286 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3287 goto send_abort;
3288 }
68259b5a 3289 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 3290 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 3291 return;
c66ac9db
NB		 3292 }
3293 }
310d3d31 3294send_abort:
c66ac9db 3295 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3296
72b59d6e
RD		 3297 transport_lun_remove_cmd(cmd);
3298
649ee054
BVA		 3299 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3300 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3301
e5c0d6ad 3302 trace_target_cmd_complete(cmd);
fa7e25cf
NB		 3303 ret = cmd->se_tfo->queue_status(cmd);
3304 if (ret)
3305 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 3306}
3307
af877292 3308static void target_tmr_work(struct work_struct *work)
c66ac9db 3309{
af877292 3310 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3311 struct se_device *dev = cmd->se_dev;
c66ac9db 3312 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 3313 unsigned long flags;
c66ac9db
NB		 3314 int ret;
3315
a6d9bb1c
NB		 3316 spin_lock_irqsave(&cmd->t_state_lock, flags);
3317 if (cmd->transport_state & CMD_T_ABORTED) {
3318 tmr->response = TMR_FUNCTION_REJECTED;
3319 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3320 goto check_stop;
3321 }
3322 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3323
c66ac9db 3324 switch (tmr->function) {
5c6cd613 3325 case TMR_ABORT_TASK:
3d28934a 3326 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3327 break;
5c6cd613
NB		 3328 case TMR_ABORT_TASK_SET:
3329 case TMR_CLEAR_ACA:
3330 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3331 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3332 break;
5c6cd613 3333 case TMR_LUN_RESET:
c66ac9db
NB		 3334 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3335 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3336 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3337 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3338 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3339 cmd->orig_fe_lun, 0x29,
3340 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3341 }
c66ac9db 3342 break;
5c6cd613 3343 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3344 tmr->response = TMR_FUNCTION_REJECTED;
3345 break;
5c6cd613 3346 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3347 tmr->response = TMR_FUNCTION_REJECTED;
3348 break;
c66ac9db 3349 default:
6708bb27 3350 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3351 tmr->function);
3352 tmr->response = TMR_FUNCTION_REJECTED;
3353 break;
3354 }
3355
a6d9bb1c
NB		 3356 spin_lock_irqsave(&cmd->t_state_lock, flags);
3357 if (cmd->transport_state & CMD_T_ABORTED) {
3358 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3359 goto check_stop;
3360 }
a6d9bb1c
NB		 3361 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3362
e3d6f909 3363 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3364
a6d9bb1c 3365check_stop:
eeb64d23 3366 transport_lun_remove_cmd(cmd);
b7b8bef7 3367 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3368}
3369
af877292
CH		 3370int transport_generic_handle_tmr(
3371 struct se_cmd *cmd)
c66ac9db 3372{
f15e9cd9 3373 unsigned long flags;
c54eeffb 3374 bool aborted = false;
f15e9cd9
NB		 3375
3376 spin_lock_irqsave(&cmd->t_state_lock, flags);
c54eeffb
NB		 3377 if (cmd->transport_state & CMD_T_ABORTED) {
3378 aborted = true;
3379 } else {
3380 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3381 cmd->transport_state |= CMD_T_ACTIVE;
3382 }
f15e9cd9
NB		 3383 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3384
c54eeffb
NB		 3385 if (aborted) {
3386 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
3387 "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
3388 cmd->se_tmr_req->ref_task_tag, cmd->tag);
eeb64d23 3389 transport_lun_remove_cmd(cmd);
c54eeffb
NB		 3390 transport_cmd_check_stop_to_fabric(cmd);
3391 return 0;
3392 }
3393
af877292
CH		 3394 INIT_WORK(&cmd->work, target_tmr_work);
3395 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3396 return 0;
3397}
af877292 3398EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3399
3400bool
3401target_check_wce(struct se_device *dev)
3402{
3403 bool wce = false;
3404
3405 if (dev->transport->get_write_cache)
3406 wce = dev->transport->get_write_cache(dev);
3407 else if (dev->dev_attrib.emulate_write_cache > 0)
3408 wce = true;
3409
3410 return wce;
3411}
3412
3413bool
3414target_check_fua(struct se_device *dev)
3415{
3416 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3417}
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