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[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
5538d294 37#include <linux/vmalloc.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
ba929992 41#include <scsi/scsi_proto.h>
9ec1e1ce 42#include <scsi/scsi_common.h>
c66ac9db
NB		 43
44#include <target/target_core_base.h>
c4795fb2
CH		 45#include <target/target_core_backend.h>
46#include <target/target_core_fabric.h>
c66ac9db 47
e26d99ae 48#include "target_core_internal.h"
c66ac9db 49#include "target_core_alua.h"
c66ac9db 50#include "target_core_pr.h"
c66ac9db
NB		 51#include "target_core_ua.h"
52
e5c0d6ad
RD		 53#define CREATE_TRACE_POINTS
54#include <trace/events/target.h>
55
35e0e757 56static struct workqueue_struct *target_completion_wq;
c66ac9db 57static struct kmem_cache *se_sess_cache;
c66ac9db 58struct kmem_cache *se_ua_cache;
c66ac9db
NB		 59struct kmem_cache *t10_pr_reg_cache;
60struct kmem_cache *t10_alua_lu_gp_cache;
61struct kmem_cache *t10_alua_lu_gp_mem_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_cache;
229d4f11
HR		 63struct kmem_cache *t10_alua_lba_map_cache;
64struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 65
c66ac9db 66static void transport_complete_task_attr(struct se_cmd *cmd);
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
NB		 254 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
255 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 256 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 257 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
258 if (!se_sess->sess_cmd_map) {
259 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
260 return -ENOMEM;
261 }
c0add7fd
NB		 262 }
263
264 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
265 if (rc < 0) {
266 pr_err("Unable to init se_sess->sess_tag_pool,"
267 " tag_num: %u\n", tag_num);
de64d3a6 268 kvfree(se_sess->sess_cmd_map);
c0add7fd
NB		 269 se_sess->sess_cmd_map = NULL;
270 return -ENOMEM;
271 }
272
273 return 0;
274}
275EXPORT_SYMBOL(transport_alloc_session_tags);
276
277struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 278 unsigned int tag_size,
279 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 280{
281 struct se_session *se_sess;
282 int rc;
283
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);
469 list_del(&nacl->acl_list);
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)
541 list_del(&se_nacl->acl_list);
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
654void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
655{
febe562c
NB		 656 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
657
68259b5a
AL		 658 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
659 transport_lun_remove_cmd(cmd);
131e6abc
NB		 660 /*
661 * Allow the fabric driver to unmap any resources before
662 * releasing the descriptor via TFO->release_cmd()
663 */
664 if (remove)
665 cmd->se_tfo->aborted_task(cmd);
68259b5a 666
c66ac9db
NB		 667 if (transport_cmd_check_stop_to_fabric(cmd))
668 return;
febe562c 669 if (remove && ack_kref)
e6a2573f 670 transport_put_cmd(cmd);
c66ac9db
NB		 671}
672
35e0e757
CH		 673static void target_complete_failure_work(struct work_struct *work)
674{
675 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
676
de103c93
CH		 677 transport_generic_request_failure(cmd,
678 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 679}
680
6138ed2a 681/*
d5829eac
PB		 682 * Used when asking transport to copy Sense Data from the underlying
683 * Linux/SCSI struct scsi_cmnd
6138ed2a 684 */
d5829eac 685static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 686{
6138ed2a 687 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 688
689 WARN_ON(!cmd->se_lun);
690
691 if (!dev)
d5829eac 692 return NULL;
6138ed2a 693
d5829eac
PB		 694 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
695 return NULL;
6138ed2a 696
9c58b7dd 697 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 698
d5829eac 699 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 700 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 701 return cmd->sense_buffer;
6138ed2a
PB		 702}
703
5787cacd 704void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 705{
42bf829e 706 struct se_device *dev = cmd->se_dev;
5787cacd 707 int success = scsi_status == GOOD;
c66ac9db 708 unsigned long flags;
c66ac9db 709
5787cacd
CH		 710 cmd->scsi_status = scsi_status;
711
712
a1d8b49a 713 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 714
c66ac9db 715 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 716 dev->transport->transport_complete(cmd,
717 cmd->t_data_sg,
718 transport_get_sense_buffer(cmd));
719 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 720 success = 1;
c66ac9db
NB		 721 }
722
3d28934a 723 /*
125d0119 724 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 725 * and transport_wait_for_tasks() will be waiting for completion..
726 */
febe562c 727 if (cmd->transport_state & CMD_T_ABORTED ||
3d28934a
NB		 728 cmd->transport_state & CMD_T_STOP) {
729 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 730 complete_all(&cmd->t_transport_stop_comp);
3d28934a 731 return;
3dca1471 732 } else if (!success) {
35e0e757 733 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 734 } else {
35e0e757 735 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 736 }
35e0e757 737
35e0e757 738 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 739 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 740 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 741
9095adaa 742 if (cmd->se_cmd_flags & SCF_USE_CPUID)
fb3269ba 743 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
9095adaa
QT		 744 else
745 queue_work(target_completion_wq, &cmd->work);
c66ac9db 746}
6bb35e00
CH		 747EXPORT_SYMBOL(target_complete_cmd);
748
2426bd45
RD		 749void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
750{
61f36166 751 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
2426bd45
RD		 752 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
753 cmd->residual_count += cmd->data_length - length;
754 } else {
755 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
756 cmd->residual_count = cmd->data_length - length;
757 }
758
759 cmd->data_length = length;
760 }
761
762 target_complete_cmd(cmd, scsi_status);
763}
764EXPORT_SYMBOL(target_complete_cmd_with_length);
765
cf572a96 766static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 767{
cf572a96
CH		 768 struct se_device *dev = cmd->se_dev;
769 unsigned long flags;
c66ac9db 770
cf572a96
CH		 771 spin_lock_irqsave(&dev->execute_task_lock, flags);
772 if (!cmd->state_active) {
773 list_add_tail(&cmd->state_list, &dev->state_list);
774 cmd->state_active = true;
c66ac9db 775 }
cf572a96 776 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 777}
778
07bde79a 779/*
f147abb4 780 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 781 */
7a6f0a1e
CH		 782static void transport_write_pending_qf(struct se_cmd *cmd);
783static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 784
0fd97ccf 785void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 786{
787 struct se_device *dev = container_of(work, struct se_device,
788 qf_work_queue);
bcac364a 789 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 790 struct se_cmd *cmd, *cmd_tmp;
791
792 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 793 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
794 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 795
bcac364a 796 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 797 list_del(&cmd->se_qf_node);
33940d09 798 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 799
6708bb27 800 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 801 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 802 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 803 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
804 : "UNKNOWN");
f7a5cc0b 805
7a6f0a1e
CH		 806 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
807 transport_write_pending_qf(cmd);
fa7e25cf
NB		 808 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK ||
809 cmd->t_state == TRANSPORT_COMPLETE_QF_ERR)
7a6f0a1e 810 transport_complete_qf(cmd);
07bde79a 811 }
07bde79a
NB		 812}
813
c66ac9db
NB		 814unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
815{
816 switch (cmd->data_direction) {
817 case DMA_NONE:
818 return "NONE";
819 case DMA_FROM_DEVICE:
820 return "READ";
821 case DMA_TO_DEVICE:
822 return "WRITE";
823 case DMA_BIDIRECTIONAL:
824 return "BIDI";
825 default:
826 break;
827 }
828
829 return "UNKNOWN";
830}
831
832void transport_dump_dev_state(
833 struct se_device *dev,
834 char *b,
835 int *bl)
836{
837 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 838 if (dev->export_count)
c66ac9db 839 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 840 else
c66ac9db 841 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 842
5f41a31d 843 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 844 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 845 dev->dev_attrib.block_size,
846 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 847 *bl += sprintf(b + *bl, " ");
848}
849
c66ac9db
NB		 850void transport_dump_vpd_proto_id(
851 struct t10_vpd *vpd,
852 unsigned char *p_buf,
853 int p_buf_len)
854{
855 unsigned char buf[VPD_TMP_BUF_SIZE];
856 int len;
857
858 memset(buf, 0, VPD_TMP_BUF_SIZE);
859 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
860
861 switch (vpd->protocol_identifier) {
862 case 0x00:
863 sprintf(buf+len, "Fibre Channel\n");
864 break;
865 case 0x10:
866 sprintf(buf+len, "Parallel SCSI\n");
867 break;
868 case 0x20:
869 sprintf(buf+len, "SSA\n");
870 break;
871 case 0x30:
872 sprintf(buf+len, "IEEE 1394\n");
873 break;
874 case 0x40:
875 sprintf(buf+len, "SCSI Remote Direct Memory Access"
876 " Protocol\n");
877 break;
878 case 0x50:
879 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
880 break;
881 case 0x60:
882 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
883 break;
884 case 0x70:
885 sprintf(buf+len, "Automation/Drive Interface Transport"
886 " Protocol\n");
887 break;
888 case 0x80:
889 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
890 break;
891 default:
892 sprintf(buf+len, "Unknown 0x%02x\n",
893 vpd->protocol_identifier);
894 break;
895 }
896
897 if (p_buf)
898 strncpy(p_buf, buf, p_buf_len);
899 else
6708bb27 900 pr_debug("%s", buf);
c66ac9db
NB		 901}
902
903void
904transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
905{
906 /*
907 * Check if the Protocol Identifier Valid (PIV) bit is set..
908 *
909 * from spc3r23.pdf section 7.5.1
910 */
911 if (page_83[1] & 0x80) {
912 vpd->protocol_identifier = (page_83[0] & 0xf0);
913 vpd->protocol_identifier_set = 1;
914 transport_dump_vpd_proto_id(vpd, NULL, 0);
915 }
916}
917EXPORT_SYMBOL(transport_set_vpd_proto_id);
918
919int transport_dump_vpd_assoc(
920 struct t10_vpd *vpd,
921 unsigned char *p_buf,
922 int p_buf_len)
923{
924 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 925 int ret = 0;
926 int len;
c66ac9db
NB		 927
928 memset(buf, 0, VPD_TMP_BUF_SIZE);
929 len = sprintf(buf, "T10 VPD Identifier Association: ");
930
931 switch (vpd->association) {
932 case 0x00:
933 sprintf(buf+len, "addressed logical unit\n");
934 break;
935 case 0x10:
936 sprintf(buf+len, "target port\n");
937 break;
938 case 0x20:
939 sprintf(buf+len, "SCSI target device\n");
940 break;
941 default:
942 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 943 ret = -EINVAL;
c66ac9db
NB		 944 break;
945 }
946
947 if (p_buf)
948 strncpy(p_buf, buf, p_buf_len);
949 else
6708bb27 950 pr_debug("%s", buf);
c66ac9db
NB		 951
952 return ret;
953}
954
955int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
956{
957 /*
958 * The VPD identification association..
959 *
960 * from spc3r23.pdf Section 7.6.3.1 Table 297
961 */
962 vpd->association = (page_83[1] & 0x30);
963 return transport_dump_vpd_assoc(vpd, NULL, 0);
964}
965EXPORT_SYMBOL(transport_set_vpd_assoc);
966
967int transport_dump_vpd_ident_type(
968 struct t10_vpd *vpd,
969 unsigned char *p_buf,
970 int p_buf_len)
971{
972 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 973 int ret = 0;
974 int len;
c66ac9db
NB		 975
976 memset(buf, 0, VPD_TMP_BUF_SIZE);
977 len = sprintf(buf, "T10 VPD Identifier Type: ");
978
979 switch (vpd->device_identifier_type) {
980 case 0x00:
981 sprintf(buf+len, "Vendor specific\n");
982 break;
983 case 0x01:
984 sprintf(buf+len, "T10 Vendor ID based\n");
985 break;
986 case 0x02:
987 sprintf(buf+len, "EUI-64 based\n");
988 break;
989 case 0x03:
990 sprintf(buf+len, "NAA\n");
991 break;
992 case 0x04:
993 sprintf(buf+len, "Relative target port identifier\n");
994 break;
995 case 0x08:
996 sprintf(buf+len, "SCSI name string\n");
997 break;
998 default:
999 sprintf(buf+len, "Unsupported: 0x%02x\n",
1000 vpd->device_identifier_type);
e3d6f909 1001 ret = -EINVAL;
c66ac9db
NB		 1002 break;
1003 }
1004
e3d6f909
AG		 1005 if (p_buf) {
1006 if (p_buf_len < strlen(buf)+1)
1007 return -EINVAL;
c66ac9db 1008 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1009 } else {
6708bb27 1010 pr_debug("%s", buf);
e3d6f909 1011 }
c66ac9db
NB		 1012
1013 return ret;
1014}
1015
1016int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1017{
1018 /*
1019 * The VPD identifier type..
1020 *
1021 * from spc3r23.pdf Section 7.6.3.1 Table 298
1022 */
1023 vpd->device_identifier_type = (page_83[1] & 0x0f);
1024 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1025}
1026EXPORT_SYMBOL(transport_set_vpd_ident_type);
1027
1028int transport_dump_vpd_ident(
1029 struct t10_vpd *vpd,
1030 unsigned char *p_buf,
1031 int p_buf_len)
1032{
1033 unsigned char buf[VPD_TMP_BUF_SIZE];
1034 int ret = 0;
1035
1036 memset(buf, 0, VPD_TMP_BUF_SIZE);
1037
1038 switch (vpd->device_identifier_code_set) {
1039 case 0x01: /* Binary */
703d641d
DC		 1040 snprintf(buf, sizeof(buf),
1041 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1042 &vpd->device_identifier[0]);
1043 break;
1044 case 0x02: /* ASCII */
703d641d
DC		 1045 snprintf(buf, sizeof(buf),
1046 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1047 &vpd->device_identifier[0]);
1048 break;
1049 case 0x03: /* UTF-8 */
703d641d
DC		 1050 snprintf(buf, sizeof(buf),
1051 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1052 &vpd->device_identifier[0]);
1053 break;
1054 default:
1055 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1056 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1057 ret = -EINVAL;
c66ac9db
NB		 1058 break;
1059 }
1060
1061 if (p_buf)
1062 strncpy(p_buf, buf, p_buf_len);
1063 else
6708bb27 1064 pr_debug("%s", buf);
c66ac9db
NB		 1065
1066 return ret;
1067}
1068
1069int
1070transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1071{
1072 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1073 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1074
1075 /*
1076 * The VPD Code Set (encoding)
1077 *
1078 * from spc3r23.pdf Section 7.6.3.1 Table 296
1079 */
1080 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1081 switch (vpd->device_identifier_code_set) {
1082 case 0x01: /* Binary */
1083 vpd->device_identifier[j++] =
1084 hex_str[vpd->device_identifier_type];
1085 while (i < (4 + page_83[3])) {
1086 vpd->device_identifier[j++] =
1087 hex_str[(page_83[i] & 0xf0) >> 4];
1088 vpd->device_identifier[j++] =
1089 hex_str[page_83[i] & 0x0f];
1090 i++;
1091 }
1092 break;
1093 case 0x02: /* ASCII */
1094 case 0x03: /* UTF-8 */
1095 while (i < (4 + page_83[3]))
1096 vpd->device_identifier[j++] = page_83[i++];
1097 break;
1098 default:
1099 break;
1100 }
1101
1102 return transport_dump_vpd_ident(vpd, NULL, 0);
1103}
1104EXPORT_SYMBOL(transport_set_vpd_ident);
1105
8f9b5654
NB		 1106static sense_reason_t
1107target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1108 unsigned int size)
1109{
1110 u32 mtl;
1111
1112 if (!cmd->se_tfo->max_data_sg_nents)
1113 return TCM_NO_SENSE;
1114 /*
1115 * Check if fabric enforced maximum SGL entries per I/O descriptor
1116 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1117 * residual_count and reduce original cmd->data_length to maximum
1118 * length based on single PAGE_SIZE entry scatter-lists.
1119 */
1120 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1121 if (cmd->data_length > mtl) {
1122 /*
1123 * If an existing CDB overflow is present, calculate new residual
1124 * based on CDB size minus fabric maximum transfer length.
1125 *
1126 * If an existing CDB underflow is present, calculate new residual
1127 * based on original cmd->data_length minus fabric maximum transfer
1128 * length.
1129 *
1130 * Otherwise, set the underflow residual based on cmd->data_length
1131 * minus fabric maximum transfer length.
1132 */
1133 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1134 cmd->residual_count = (size - mtl);
1135 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1136 u32 orig_dl = size + cmd->residual_count;
1137 cmd->residual_count = (orig_dl - mtl);
1138 } else {
1139 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1140 cmd->residual_count = (cmd->data_length - mtl);
1141 }
1142 cmd->data_length = mtl;
1143 /*
1144 * Reset sbc_check_prot() calculated protection payload
1145 * length based upon the new smaller MTL.
1146 */
1147 if (cmd->prot_length) {
1148 u32 sectors = (mtl / dev->dev_attrib.block_size);
1149 cmd->prot_length = dev->prot_length * sectors;
1150 }
1151 }
1152 return TCM_NO_SENSE;
1153}
1154
de103c93
CH		 1155sense_reason_t
1156target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1157{
1158 struct se_device *dev = cmd->se_dev;
1159
1160 if (cmd->unknown_data_length) {
1161 cmd->data_length = size;
1162 } else if (size != cmd->data_length) {
1163 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1164 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1165 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1166 cmd->data_length, size, cmd->t_task_cdb[0]);
1167
c72c5250
RD		 1168 if (cmd->data_direction == DMA_TO_DEVICE &&
1169 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1170 pr_err("Rejecting underflow/overflow WRITE data\n");
de103c93 1171 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1172 }
1173 /*
1174 * Reject READ_* or WRITE_* with overflow/underflow for
1175 * type SCF_SCSI_DATA_CDB.
1176 */
0fd97ccf 1177 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1178 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1179 " CDB on non 512-byte sector setup subsystem"
1180 " plugin: %s\n", dev->transport->name);
1181 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1182 return TCM_INVALID_CDB_FIELD;
9b3b8041 1183 }
4c054ba6
NB		 1184 /*
1185 * For the overflow case keep the existing fabric provided
1186 * ->data_length. Otherwise for the underflow case, reset
1187 * ->data_length to the smaller SCSI expected data transfer
1188 * length.
1189 */
9b3b8041
CH		 1190 if (size > cmd->data_length) {
1191 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1192 cmd->residual_count = (size - cmd->data_length);
1193 } else {
1194 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1195 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1196 cmd->data_length = size;
9b3b8041 1197 }
9b3b8041
CH		 1198 }
1199
8f9b5654 1200 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1201
9b3b8041
CH		 1202}
1203
c66ac9db
NB		 1204/*
1205 * Used by fabric modules containing a local struct se_cmd within their
1206 * fabric dependent per I/O descriptor.
649ee054
BVA		 1207 *
1208 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1209 */
1210void transport_init_se_cmd(
1211 struct se_cmd *cmd,
9ac8928e 1212 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1213 struct se_session *se_sess,
1214 u32 data_length,
1215 int data_direction,
1216 int task_attr,
1217 unsigned char *sense_buffer)
1218{
5951146d 1219 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1220 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1221 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1222 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1223 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1224 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1225 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1226 kref_init(&cmd->cmd_kref);
c66ac9db
NB		 1227
1228 cmd->se_tfo = tfo;
1229 cmd->se_sess = se_sess;
1230 cmd->data_length = data_length;
1231 cmd->data_direction = data_direction;
1232 cmd->sam_task_attr = task_attr;
1233 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1234
1235 cmd->state_active = false;
c66ac9db
NB		 1236}
1237EXPORT_SYMBOL(transport_init_se_cmd);
1238
de103c93
CH		 1239static sense_reason_t
1240transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1241{
019c4ca6
CH		 1242 struct se_device *dev = cmd->se_dev;
1243
c66ac9db
NB		 1244 /*
1245 * Check if SAM Task Attribute emulation is enabled for this
1246 * struct se_device storage object
1247 */
a3541703 1248 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1249 return 0;
1250
68d81f40 1251 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1252 pr_debug("SAM Task Attribute ACA"
c66ac9db 1253 " emulation is not supported\n");
de103c93 1254 return TCM_INVALID_CDB_FIELD;
c66ac9db 1255 }
9c31820b 1256
c66ac9db
NB		 1257 return 0;
1258}
1259
de103c93
CH		 1260sense_reason_t
1261target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1262{
0fd97ccf 1263 struct se_device *dev = cmd->se_dev;
de103c93 1264 sense_reason_t ret;
c66ac9db 1265
c66ac9db
NB		 1266 /*
1267 * Ensure that the received CDB is less than the max (252 + 8) bytes
1268 * for VARIABLE_LENGTH_CMD
1269 */
1270 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1271 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1272 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1273 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1274 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1275 }
1276 /*
1277 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1278 * allocate the additional extended CDB buffer now.. Otherwise
1279 * setup the pointer from __t_task_cdb to t_task_cdb.
1280 */
a1d8b49a
AG		 1281 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1282 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1283 GFP_KERNEL);
6708bb27
AG		 1284 if (!cmd->t_task_cdb) {
1285 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1286 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1287 scsi_command_size(cdb),
a1d8b49a 1288 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1289 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1290 }
1291 } else
a1d8b49a 1292 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1293 /*
a1d8b49a 1294 * Copy the original CDB into cmd->
c66ac9db 1295 */
a1d8b49a 1296 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1297
e5c0d6ad
RD		 1298 trace_target_sequencer_start(cmd);
1299
0fd97ccf 1300 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1301 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1302 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1303 cmd->se_tfo->get_fabric_name(),
1304 cmd->se_sess->se_node_acl->initiatorname,
1305 cmd->t_task_cdb[0]);
de103c93
CH		 1306 if (ret)
1307 return ret;
1308
1309 ret = transport_check_alloc_task_attr(cmd);
1310 if (ret)
c66ac9db 1311 return ret;
cb4f4d3c 1312
cb4f4d3c 1313 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1314 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1315 return 0;
1316}
a12f41f8 1317EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1318
695434e1
NB		 1319/*
1320 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1321 * May only be used from process context.
695434e1
NB		 1322 */
1323int transport_handle_cdb_direct(
1324 struct se_cmd *cmd)
1325{
de103c93 1326 sense_reason_t ret;
dd8ae59d 1327
695434e1
NB		 1328 if (!cmd->se_lun) {
1329 dump_stack();
6708bb27 1330 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1331 return -EINVAL;
1332 }
1333 if (in_interrupt()) {
1334 dump_stack();
6708bb27 1335 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1336 " from interrupt context\n");
1337 return -EINVAL;
1338 }
dd8ae59d 1339 /*
af877292
CH		 1340 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1341 * outstanding descriptors are handled correctly during shutdown via
1342 * transport_wait_for_tasks()
dd8ae59d
NB		 1343 *
1344 * Also, we don't take cmd->t_state_lock here as we only expect
1345 * this to be called for initial descriptor submission.
1346 */
1347 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1348 cmd->transport_state |= CMD_T_ACTIVE;
1349
dd8ae59d
NB		 1350 /*
1351 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1352 * so follow TRANSPORT_NEW_CMD processing thread context usage
1353 * and call transport_generic_request_failure() if necessary..
1354 */
1355 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1356 if (ret)
1357 transport_generic_request_failure(cmd, ret);
dd8ae59d 1358 return 0;
695434e1
NB		 1359}
1360EXPORT_SYMBOL(transport_handle_cdb_direct);
1361
c5ff8d6b 1362sense_reason_t
de103c93
CH		 1363transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1364 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1365{
1366 if (!sgl || !sgl_count)
1367 return 0;
1368
1369 /*
1370 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1371 * scatterlists already have been set to follow what the fabric
1372 * passes for the original expected data transfer length.
1373 */
1374 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1375 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1376 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1377 return TCM_INVALID_CDB_FIELD;
1378 }
1379
1380 cmd->t_data_sg = sgl;
1381 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1382 cmd->t_bidi_data_sg = sgl_bidi;
1383 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1384
de103c93
CH		 1385 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1386 return 0;
1387}
1388
a026757f
NB		 1389/*
1390 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1391 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1392 *
1393 * @se_cmd: command descriptor to submit
1394 * @se_sess: associated se_sess for endpoint
1395 * @cdb: pointer to SCSI CDB
1396 * @sense: pointer to SCSI sense buffer
1397 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1398 * @data_length: fabric expected data transfer length
1399 * @task_addr: SAM task attribute
1400 * @data_dir: DMA data direction
1401 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1402 * @sgl: struct scatterlist memory for unidirectional mapping
1403 * @sgl_count: scatterlist count for unidirectional mapping
1404 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1405 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1406 * @sgl_prot: struct scatterlist memory protection information
1407 * @sgl_prot_count: scatterlist count for protection information
a6360785 1408 *
649ee054
BVA		 1409 * Task tags are supported if the caller has set @se_cmd->tag.
1410 *
d6dfc868
RD		 1411 * Returns non zero to signal active I/O shutdown failure. All other
1412 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1413 * but still return zero here.
1414 *
a6360785
NB		 1415 * This may only be called from process context, and also currently
1416 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1417 */
1418int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1419 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1420 u32 data_length, int task_attr, int data_dir, int flags,
1421 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1422 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1423 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1424{
1425 struct se_portal_group *se_tpg;
de103c93
CH		 1426 sense_reason_t rc;
1427 int ret;
a6360785
NB		 1428
1429 se_tpg = se_sess->se_tpg;
1430 BUG_ON(!se_tpg);
1431 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1432 BUG_ON(in_interrupt());
1433 /*
1434 * Initialize se_cmd for target operation. From this point
1435 * exceptions are handled by sending exception status via
1436 * target_core_fabric_ops->queue_status() callback
1437 */
1438 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1439 data_length, data_dir, task_attr, sense);
9095adaa
QT		 1440
1441 if (flags & TARGET_SCF_USE_CPUID)
1442 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1443 else
1444 se_cmd->cpuid = WORK_CPU_UNBOUND;
1445
b0d79946
SAS		 1446 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1447 se_cmd->unknown_data_length = 1;
a6360785
NB		 1448 /*
1449 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1450 * se_sess->sess_cmd_list. A second kref_get here is necessary
1451 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1452 * kref_put() to happen during fabric packet acknowledgement.
1453 */
afc16604 1454 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1455 if (ret)
1456 return ret;
a6360785
NB		 1457 /*
1458 * Signal bidirectional data payloads to target-core
1459 */
1460 if (flags & TARGET_SCF_BIDI_OP)
1461 se_cmd->se_cmd_flags |= SCF_BIDI;
1462 /*
1463 * Locate se_lun pointer and attach it to struct se_cmd
1464 */
de103c93
CH		 1465 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1466 if (rc) {
1467 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1468 target_put_sess_cmd(se_cmd);
d6dfc868 1469 return 0;
735703ca 1470 }
b5b8e298
SG		 1471
1472 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1473 if (rc != 0) {
1474 transport_generic_request_failure(se_cmd, rc);
1475 return 0;
1476 }
1477
def2b339
NB		 1478 /*
1479 * Save pointers for SGLs containing protection information,
1480 * if present.
1481 */
1482 if (sgl_prot_count) {
1483 se_cmd->t_prot_sg = sgl_prot;
1484 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1485 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1486 }
d6e0175c 1487
a026757f
NB		 1488 /*
1489 * When a non zero sgl_count has been passed perform SGL passthrough
1490 * mapping for pre-allocated fabric memory instead of having target
1491 * core perform an internal SGL allocation..
1492 */
1493 if (sgl_count != 0) {
1494 BUG_ON(!sgl);
1495
944981c7
NB		 1496 /*
1497 * A work-around for tcm_loop as some userspace code via
1498 * scsi-generic do not memset their associated read buffers,
1499 * so go ahead and do that here for type non-data CDBs. Also
1500 * note that this is currently guaranteed to be a single SGL
1501 * for this case by target core in target_setup_cmd_from_cdb()
1502 * -> transport_generic_cmd_sequencer().
1503 */
1504 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1505 se_cmd->data_direction == DMA_FROM_DEVICE) {
1506 unsigned char *buf = NULL;
1507
1508 if (sgl)
1509 buf = kmap(sg_page(sgl)) + sgl->offset;
1510
1511 if (buf) {
1512 memset(buf, 0, sgl->length);
1513 kunmap(sg_page(sgl));
1514 }
1515 }
1516
a026757f
NB		 1517 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1518 sgl_bidi, sgl_bidi_count);
1519 if (rc != 0) {
de103c93 1520 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1521 return 0;
1522 }
1523 }
def2b339 1524
11e319ed
AG		 1525 /*
1526 * Check if we need to delay processing because of ALUA
1527 * Active/NonOptimized primary access state..
1528 */
1529 core_alua_check_nonop_delay(se_cmd);
1530
a6360785 1531 transport_handle_cdb_direct(se_cmd);
d6dfc868 1532 return 0;
a6360785 1533}
a026757f
NB		 1534EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1535
1536/*
1537 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1538 *
1539 * @se_cmd: command descriptor to submit
1540 * @se_sess: associated se_sess for endpoint
1541 * @cdb: pointer to SCSI CDB
1542 * @sense: pointer to SCSI sense buffer
1543 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1544 * @data_length: fabric expected data transfer length
1545 * @task_addr: SAM task attribute
1546 * @data_dir: DMA data direction
1547 * @flags: flags for command submission from target_sc_flags_tables
1548 *
649ee054
BVA		 1549 * Task tags are supported if the caller has set @se_cmd->tag.
1550 *
a026757f
NB		 1551 * Returns non zero to signal active I/O shutdown failure. All other
1552 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1553 * but still return zero here.
1554 *
1555 * This may only be called from process context, and also currently
1556 * assumes internal allocation of fabric payload buffer by target-core.
1557 *
1558 * It also assumes interal target core SGL memory allocation.
1559 */
1560int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1561 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1562 u32 data_length, int task_attr, int data_dir, int flags)
1563{
1564 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1565 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1566 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1567}
a6360785
NB		 1568EXPORT_SYMBOL(target_submit_cmd);
1569
9f0d05c2
NB		 1570static void target_complete_tmr_failure(struct work_struct *work)
1571{
1572 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1573
1574 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1575 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1576
1577 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1578}
1579
ea98d7f9
AG		 1580/**
1581 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1582 * for TMR CDBs
1583 *
1584 * @se_cmd: command descriptor to submit
1585 * @se_sess: associated se_sess for endpoint
1586 * @sense: pointer to SCSI sense buffer
1587 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1588 * @fabric_context: fabric context for TMR req
1589 * @tm_type: Type of TM request
c0974f89
NB		 1590 * @gfp: gfp type for caller
1591 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1592 * @flags: submit cmd flags
ea98d7f9
AG		 1593 *
1594 * Callable from all contexts.
1595 **/
1596
c7042cae 1597int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1598 unsigned char *sense, u64 unpacked_lun,
c0974f89 1599 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1600 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1601{
1602 struct se_portal_group *se_tpg;
1603 int ret;
1604
1605 se_tpg = se_sess->se_tpg;
1606 BUG_ON(!se_tpg);
1607
1608 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1609 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1610 /*
1611 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1612 * allocation failure.
1613 */
c0974f89 1614 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1615 if (ret < 0)
1616 return -ENOMEM;
ea98d7f9 1617
c0974f89
NB		 1618 if (tm_type == TMR_ABORT_TASK)
1619 se_cmd->se_tmr_req->ref_task_tag = tag;
1620
ea98d7f9 1621 /* See target_submit_cmd for commentary */
afc16604 1622 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1623 if (ret) {
1624 core_tmr_release_req(se_cmd->se_tmr_req);
1625 return ret;
1626 }
ea98d7f9 1627
ea98d7f9
AG		 1628 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1629 if (ret) {
9f0d05c2
NB		 1630 /*
1631 * For callback during failure handling, push this work off
1632 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1633 */
1634 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1635 schedule_work(&se_cmd->work);
c7042cae 1636 return 0;
ea98d7f9
AG		 1637 }
1638 transport_generic_handle_tmr(se_cmd);
c7042cae 1639 return 0;
ea98d7f9
AG		 1640}
1641EXPORT_SYMBOL(target_submit_tmr);
1642
c66ac9db
NB		 1643/*
1644 * Handle SAM-esque emulation for generic transport request failures.
1645 */
de103c93
CH		 1646void transport_generic_request_failure(struct se_cmd *cmd,
1647 sense_reason_t sense_reason)
c66ac9db 1648{
057085e5 1649 int ret = 0, post_ret = 0;
07bde79a 1650
e3b88ee9
BVA		 1651 if (transport_check_aborted_status(cmd, 1))
1652 return;
1653
649ee054
BVA		 1654 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1655 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1656 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1657 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1658 cmd->t_state, sense_reason);
d43d6aea 1659 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1660 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1661 (cmd->transport_state & CMD_T_STOP) != 0,
1662 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1663
c66ac9db
NB		 1664 /*
1665 * For SAM Task Attribute emulation for failed struct se_cmd
1666 */
019c4ca6 1667 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1668 /*
1669 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1670 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1671 */
1672 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1673 cmd->transport_complete_callback)
057085e5 1674 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1675
de103c93 1676 switch (sense_reason) {
03e98c9e
NB		 1677 case TCM_NON_EXISTENT_LUN:
1678 case TCM_UNSUPPORTED_SCSI_OPCODE:
1679 case TCM_INVALID_CDB_FIELD:
1680 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1681 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1682 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1683 case TCM_UNKNOWN_MODE_PAGE:
1684 case TCM_WRITE_PROTECTED:
e2397c70 1685 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1686 case TCM_CHECK_CONDITION_ABORT_CMD:
1687 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1688 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1689 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1690 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1691 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
449a1378 1692 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
e8642120
DD		 1693 case TCM_TOO_MANY_TARGET_DESCS:
1694 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE:
1695 case TCM_TOO_MANY_SEGMENT_DESCS:
1696 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE:
c66ac9db 1697 break;
de103c93
CH		 1698 case TCM_OUT_OF_RESOURCES:
1699 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1700 break;
03e98c9e 1701 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1702 /*
1703 * No SENSE Data payload for this case, set SCSI Status
1704 * and queue the response to $FABRIC_MOD.
1705 *
1706 * Uses linux/include/scsi/scsi.h SAM status codes defs
1707 */
1708 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1709 /*
1710 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1711 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1712 * CONFLICT STATUS.
1713 *
1714 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1715 */
e3d6f909 1716 if (cmd->se_sess &&
c51c8e7b
HR		 1717 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1718 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1719 cmd->orig_fe_lun, 0x2C,
1720 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1721 }
e5c0d6ad 1722 trace_target_cmd_complete(cmd);
c51c8e7b 1723 ret = cmd->se_tfo->queue_status(cmd);
fa7e25cf 1724 if (ret)
07bde79a 1725 goto queue_full;
c66ac9db 1726 goto check_stop;
c66ac9db 1727 default:
6708bb27 1728 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1729 cmd->t_task_cdb[0], sense_reason);
1730 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1731 break;
1732 }
f3146437 1733
de103c93 1734 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
fa7e25cf 1735 if (ret)
03e98c9e 1736 goto queue_full;
07bde79a 1737
c66ac9db
NB		 1738check_stop:
1739 transport_lun_remove_cmd(cmd);
06b967e4 1740 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1741 return;
1742
1743queue_full:
fa7e25cf 1744 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db 1745}
2fbff127 1746EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1747
dff0ca9e 1748void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
c66ac9db 1749{
de103c93 1750 sense_reason_t ret;
5f41a31d 1751
dff0ca9e
NB		 1752 if (!cmd->execute_cmd) {
1753 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1754 goto err;
1755 }
1756 if (do_checks) {
1757 /*
1758 * Check for an existing UNIT ATTENTION condition after
1759 * target_handle_task_attr() has done SAM task attr
1760 * checking, and possibly have already defered execution
1761 * out to target_restart_delayed_cmds() context.
1762 */
1763 ret = target_scsi3_ua_check(cmd);
1764 if (ret)
1765 goto err;
1766
1767 ret = target_alua_state_check(cmd);
1768 if (ret)
1769 goto err;
5f41a31d 1770
dff0ca9e
NB		 1771 ret = target_check_reservation(cmd);
1772 if (ret) {
1773 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1774 goto err;
de103c93 1775 }
5f41a31d 1776 }
dff0ca9e
NB		 1777
1778 ret = cmd->execute_cmd(cmd);
1779 if (!ret)
1780 return;
1781err:
1782 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1783 cmd->transport_state &= ~CMD_T_SENT;
dff0ca9e
NB		 1784 spin_unlock_irq(&cmd->t_state_lock);
1785
1786 transport_generic_request_failure(cmd, ret);
5f41a31d
CH		 1787}
1788
aa58b531
NB		 1789static int target_write_prot_action(struct se_cmd *cmd)
1790{
5132d1e6 1791 u32 sectors;
aa58b531
NB		 1792 /*
1793 * Perform WRITE_INSERT of PI using software emulation when backend
1794 * device has PI enabled, if the transport has not already generated
1795 * PI using hardware WRITE_INSERT offload.
1796 */
1797 switch (cmd->prot_op) {
1798 case TARGET_PROT_DOUT_INSERT:
1799 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1800 sbc_dif_generate(cmd);
1801 break;
5132d1e6
NB		 1802 case TARGET_PROT_DOUT_STRIP:
1803 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1804 break;
1805
1806 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1807 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1808 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1809 if (unlikely(cmd->pi_err)) {
1810 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1811 cmd->transport_state &= ~CMD_T_SENT;
5132d1e6
NB		 1812 spin_unlock_irq(&cmd->t_state_lock);
1813 transport_generic_request_failure(cmd, cmd->pi_err);
1814 return -1;
1815 }
1816 break;
aa58b531
NB		 1817 default:
1818 break;
1819 }
1820
1821 return 0;
1822}
1823
019c4ca6 1824static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1825{
1826 struct se_device *dev = cmd->se_dev;
1827
a3541703 1828 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1829 return false;
5f41a31d 1830
410c29df
NB		 1831 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1832
c66ac9db 1833 /*
25985edc 1834 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1835 * to allow the passed struct se_cmd list of tasks to the front of the list.
1836 */
5f41a31d 1837 switch (cmd->sam_task_attr) {
68d81f40 1838 case TCM_HEAD_TAG:
9c31820b
RD		 1839 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1840 cmd->t_task_cdb[0]);
019c4ca6 1841 return false;
68d81f40 1842 case TCM_ORDERED_TAG:
33940d09 1843 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1844
9c31820b
RD		 1845 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1846 cmd->t_task_cdb[0]);
5f41a31d 1847
c66ac9db 1848 /*
5f41a31d
CH		 1849 * Execute an ORDERED command if no other older commands
1850 * exist that need to be completed first.
c66ac9db 1851 */
5f41a31d 1852 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1853 return false;
5f41a31d
CH		 1854 break;
1855 default:
c66ac9db
NB		 1856 /*
1857 * For SIMPLE and UNTAGGED Task Attribute commands
1858 */
33940d09 1859 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1860 break;
c66ac9db 1861 }
5f41a31d 1862
019c4ca6
CH		 1863 if (atomic_read(&dev->dev_ordered_sync) == 0)
1864 return false;
c66ac9db 1865
019c4ca6
CH		 1866 spin_lock(&dev->delayed_cmd_lock);
1867 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1868 spin_unlock(&dev->delayed_cmd_lock);
1869
9c31820b
RD		 1870 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1871 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1872 return true;
1873}
1874
310d3d31
NB		 1875static int __transport_check_aborted_status(struct se_cmd *, int);
1876
019c4ca6
CH		 1877void target_execute_cmd(struct se_cmd *cmd)
1878{
019c4ca6
CH		 1879 /*
1880 * Determine if frontend context caller is requesting the stopping of
1881 * this command for frontend exceptions.
310d3d31
NB		 1882 *
1883 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1884 */
4a9a6c8d 1885 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1886 if (__transport_check_aborted_status(cmd, 1)) {
1887 spin_unlock_irq(&cmd->t_state_lock);
1888 return;
1889 }
019c4ca6 1890 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1891 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1892 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1893
1894 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1895 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1896 return;
1897 }
1898
1899 cmd->t_state = TRANSPORT_PROCESSING;
fd5e64de 1900 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
019c4ca6 1901 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1902
1903 if (target_write_prot_action(cmd))
1904 return;
019c4ca6 1905
1a398b97
NB		 1906 if (target_handle_task_attr(cmd)) {
1907 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1908 cmd->transport_state &= ~CMD_T_SENT;
1a398b97
NB		 1909 spin_unlock_irq(&cmd->t_state_lock);
1910 return;
1911 }
1912
dff0ca9e 1913 __target_execute_cmd(cmd, true);
c66ac9db 1914}
70baf0ab 1915EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1916
5f41a31d
CH		 1917/*
1918 * Process all commands up to the last received ORDERED task attribute which
1919 * requires another blocking boundary
1920 */
1921static void target_restart_delayed_cmds(struct se_device *dev)
1922{
1923 for (;;) {
1924 struct se_cmd *cmd;
1925
1926 spin_lock(&dev->delayed_cmd_lock);
1927 if (list_empty(&dev->delayed_cmd_list)) {
1928 spin_unlock(&dev->delayed_cmd_lock);
1929 break;
1930 }
1931
1932 cmd = list_entry(dev->delayed_cmd_list.next,
1933 struct se_cmd, se_delayed_node);
1934 list_del(&cmd->se_delayed_node);
1935 spin_unlock(&dev->delayed_cmd_lock);
1936
dff0ca9e 1937 __target_execute_cmd(cmd, true);
5f41a31d 1938
68d81f40 1939 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1940 break;
1941 }
1942}
1943
c66ac9db 1944/*
35e0e757 1945 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1946 * and ordered cmds need to have their tasks added to the execution queue.
1947 */
1948static void transport_complete_task_attr(struct se_cmd *cmd)
1949{
5951146d 1950 struct se_device *dev = cmd->se_dev;
c66ac9db 1951
a3541703 1952 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1953 return;
1954
410c29df
NB		 1955 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
1956 goto restart;
1957
68d81f40 1958 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1959 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1960 dev->dev_cur_ordered_id++;
68d81f40 1961 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1962 dev->dev_cur_ordered_id++;
9c31820b
RD		 1963 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1964 dev->dev_cur_ordered_id);
68d81f40 1965 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1966 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1967
1968 dev->dev_cur_ordered_id++;
9c31820b
RD		 1969 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1970 dev->dev_cur_ordered_id);
c66ac9db 1971 }
410c29df 1972restart:
5f41a31d 1973 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1974}
1975
e057f533 1976static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1977{
1978 int ret = 0;
1979
019c4ca6 1980 transport_complete_task_attr(cmd);
fa7e25cf
NB		 1981 /*
1982 * If a fabric driver ->write_pending() or ->queue_data_in() callback
1983 * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and
1984 * the same callbacks should not be retried. Return CHECK_CONDITION
1985 * if a scsi_status is not already set.
1986 *
1987 * If a fabric driver ->queue_status() has returned non zero, always
1988 * keep retrying no matter what..
1989 */
1990 if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) {
1991 if (cmd->scsi_status)
1992 goto queue_status;
e057f533 1993
fa7e25cf
NB		 1994 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
1995 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
1996 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
1997 translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
1998 goto queue_status;
e057f533 1999 }
07bde79a 2000
fa7e25cf
NB		 2001 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
2002 goto queue_status;
2003
07bde79a
NB		 2004 switch (cmd->data_direction) {
2005 case DMA_FROM_DEVICE:
4347ab5a
NB		 2006 if (cmd->scsi_status)
2007 goto queue_status;
2008
e5c0d6ad 2009 trace_target_cmd_complete(cmd);
07bde79a
NB		 2010 ret = cmd->se_tfo->queue_data_in(cmd);
2011 break;
2012 case DMA_TO_DEVICE:
64577407 2013 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 2014 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 2015 break;
07bde79a
NB		 2016 }
2017 /* Fall through for DMA_TO_DEVICE */
2018 case DMA_NONE:
4347ab5a 2019queue_status:
e5c0d6ad 2020 trace_target_cmd_complete(cmd);
07bde79a
NB		 2021 ret = cmd->se_tfo->queue_status(cmd);
2022 break;
2023 default:
2024 break;
2025 }
2026
e057f533 2027 if (ret < 0) {
fa7e25cf 2028 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
e057f533
CH		 2029 return;
2030 }
2031 transport_lun_remove_cmd(cmd);
2032 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2033}
2034
fa7e25cf
NB		 2035static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev,
2036 int err, bool write_pending)
07bde79a 2037{
fa7e25cf
NB		 2038 /*
2039 * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or
2040 * ->queue_data_in() callbacks from new process context.
2041 *
2042 * Otherwise for other errors, transport_complete_qf() will send
2043 * CHECK_CONDITION via ->queue_status() instead of attempting to
2044 * retry associated fabric driver data-transfer callbacks.
2045 */
2046 if (err == -EAGAIN || err == -ENOMEM) {
2047 cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP :
2048 TRANSPORT_COMPLETE_QF_OK;
2049 } else {
2050 pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err);
2051 cmd->t_state = TRANSPORT_COMPLETE_QF_ERR;
2052 }
2053
07bde79a 2054 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2055 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2056 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2057 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2058
2059 schedule_work(&cmd->se_dev->qf_work_queue);
2060}
2061
fdeab852 2062static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2063{
fdeab852
NB		 2064 switch (cmd->prot_op) {
2065 case TARGET_PROT_DIN_STRIP:
2066 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2067 u32 sectors = cmd->data_length >>
2068 ilog2(cmd->se_dev->dev_attrib.block_size);
2069
2070 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2071 sectors, 0, cmd->t_prot_sg,
2072 0);
2073 if (cmd->pi_err)
fdeab852 2074 return true;
bc005869 2075 }
fdeab852 2076 break;
72c03850
NB		 2077 case TARGET_PROT_DIN_INSERT:
2078 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2079 break;
2080
2081 sbc_dif_generate(cmd);
2082 break;
fdeab852
NB		 2083 default:
2084 break;
bc005869
NB		 2085 }
2086
2087 return false;
2088}
2089
35e0e757 2090static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2091{
35e0e757 2092 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2093 int ret;
35e0e757 2094
c66ac9db
NB		 2095 /*
2096 * Check if we need to move delayed/dormant tasks from cmds on the
2097 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2098 * Attribute.
2099 */
019c4ca6
CH		 2100 transport_complete_task_attr(cmd);
2101
07bde79a
NB		 2102 /*
2103 * Check to schedule QUEUE_FULL work, or execute an existing
2104 * cmd->transport_qf_callback()
2105 */
2106 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2107 schedule_work(&cmd->se_dev->qf_work_queue);
2108
c66ac9db 2109 /*
d5829eac 2110 * Check if we need to send a sense buffer from
c66ac9db
NB		 2111 * the struct se_cmd in question.
2112 */
2113 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2114 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2115 ret = transport_send_check_condition_and_sense(
2116 cmd, 0, 1);
fa7e25cf 2117 if (ret)
27a27099
PB		 2118 goto queue_full;
2119
2120 transport_lun_remove_cmd(cmd);
2121 transport_cmd_check_stop_to_fabric(cmd);
2122 return;
c66ac9db
NB		 2123 }
2124 /*
25985edc 2125 * Check for a callback, used by amongst other things
a6b0133c 2126 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2127 */
a6b0133c
NB		 2128 if (cmd->transport_complete_callback) {
2129 sense_reason_t rc;
057085e5
NB		 2130 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2131 bool zero_dl = !(cmd->data_length);
2132 int post_ret = 0;
a6b0133c 2133
057085e5
NB		 2134 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2135 if (!rc && !post_ret) {
2136 if (caw && zero_dl)
c8e63985
NB		 2137 goto queue_rsp;
2138
a6b0133c 2139 return;
a2890087
NB		 2140 } else if (rc) {
2141 ret = transport_send_check_condition_and_sense(cmd,
2142 rc, 0);
fa7e25cf 2143 if (ret)
a2890087 2144 goto queue_full;
a6b0133c 2145
a2890087
NB		 2146 transport_lun_remove_cmd(cmd);
2147 transport_cmd_check_stop_to_fabric(cmd);
2148 return;
2149 }
a6b0133c 2150 }
c66ac9db 2151
c8e63985 2152queue_rsp:
c66ac9db
NB		 2153 switch (cmd->data_direction) {
2154 case DMA_FROM_DEVICE:
4347ab5a
NB		 2155 if (cmd->scsi_status)
2156 goto queue_status;
2157
4cc987ea
NB		 2158 atomic_long_add(cmd->data_length,
2159 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2160 /*
2161 * Perform READ_STRIP of PI using software emulation when
2162 * backend had PI enabled, if the transport will not be
2163 * performing hardware READ_STRIP offload.
2164 */
fdeab852 2165 if (target_read_prot_action(cmd)) {
bc005869
NB		 2166 ret = transport_send_check_condition_and_sense(cmd,
2167 cmd->pi_err, 0);
fa7e25cf 2168 if (ret)
bc005869
NB		 2169 goto queue_full;
2170
2171 transport_lun_remove_cmd(cmd);
2172 transport_cmd_check_stop_to_fabric(cmd);
2173 return;
2174 }
c66ac9db 2175
e5c0d6ad 2176 trace_target_cmd_complete(cmd);
07bde79a 2177 ret = cmd->se_tfo->queue_data_in(cmd);
fa7e25cf 2178 if (ret)
07bde79a 2179 goto queue_full;
c66ac9db
NB		 2180 break;
2181 case DMA_TO_DEVICE:
4cc987ea
NB		 2182 atomic_long_add(cmd->data_length,
2183 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2184 /*
2185 * Check if we need to send READ payload for BIDI-COMMAND
2186 */
64577407 2187 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2188 atomic_long_add(cmd->data_length,
2189 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2190 ret = cmd->se_tfo->queue_data_in(cmd);
fa7e25cf 2191 if (ret)
07bde79a 2192 goto queue_full;
c66ac9db
NB		 2193 break;
2194 }
2195 /* Fall through for DMA_TO_DEVICE */
2196 case DMA_NONE:
4347ab5a 2197queue_status:
e5c0d6ad 2198 trace_target_cmd_complete(cmd);
07bde79a 2199 ret = cmd->se_tfo->queue_status(cmd);
fa7e25cf 2200 if (ret)
07bde79a 2201 goto queue_full;
c66ac9db
NB		 2202 break;
2203 default:
2204 break;
2205 }
2206
2207 transport_lun_remove_cmd(cmd);
2208 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2209 return;
2210
2211queue_full:
6708bb27 2212 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2213 " data_direction: %d\n", cmd, cmd->data_direction);
fa7e25cf
NB		 2214
2215 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 2216}
2217
e64aa657 2218void target_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2219{
ec98f782 2220 struct scatterlist *sg;
ec98f782 2221 int count;
c66ac9db 2222
6708bb27
AG		 2223 for_each_sg(sgl, sg, nents, count)
2224 __free_page(sg_page(sg));
c66ac9db 2225
6708bb27
AG		 2226 kfree(sgl);
2227}
e64aa657 2228EXPORT_SYMBOL(target_free_sgl);
c66ac9db 2229
47e459e6
NB		 2230static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2231{
2232 /*
2233 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2234 * emulation, and free + reset pointers if necessary..
2235 */
2236 if (!cmd->t_data_sg_orig)
2237 return;
2238
2239 kfree(cmd->t_data_sg);
2240 cmd->t_data_sg = cmd->t_data_sg_orig;
2241 cmd->t_data_sg_orig = NULL;
2242 cmd->t_data_nents = cmd->t_data_nents_orig;
2243 cmd->t_data_nents_orig = 0;
2244}
2245
6708bb27
AG		 2246static inline void transport_free_pages(struct se_cmd *cmd)
2247{
5835812f 2248 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
e64aa657 2249 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
5835812f
AM		 2250 cmd->t_prot_sg = NULL;
2251 cmd->t_prot_nents = 0;
2252 }
2253
47e459e6 2254 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2255 /*
2256 * Release special case READ buffer payload required for
2257 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2258 */
2259 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
e64aa657 2260 target_free_sgl(cmd->t_bidi_data_sg,
c8e63985
NB		 2261 cmd->t_bidi_data_nents);
2262 cmd->t_bidi_data_sg = NULL;
2263 cmd->t_bidi_data_nents = 0;
2264 }
47e459e6 2265 transport_reset_sgl_orig(cmd);
6708bb27 2266 return;
47e459e6
NB		 2267 }
2268 transport_reset_sgl_orig(cmd);
6708bb27 2269
e64aa657 2270 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2271 cmd->t_data_sg = NULL;
2272 cmd->t_data_nents = 0;
c66ac9db 2273
e64aa657 2274 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2275 cmd->t_bidi_data_sg = NULL;
2276 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2277}
2278
e26d99ae 2279/**
febe562c
NB		 2280 * transport_put_cmd - release a reference to a command
2281 * @cmd: command to release
e26d99ae 2282 *
febe562c 2283 * This routine releases our reference to the command and frees it if possible.
e26d99ae 2284 */
febe562c 2285static int transport_put_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2286{
2287 BUG_ON(!cmd->se_tfo);
e26d99ae 2288 /*
7481deb4
NB		 2289 * If this cmd has been setup with target_get_sess_cmd(), drop
2290 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2291 */
afc16604 2292 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2293}
2294
4949314c 2295void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2296{
ec98f782 2297 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2298 struct page **pages;
2299 int i;
05d1c7c0
AG		 2300
2301 /*
ec98f782
AG		 2302 * We need to take into account a possible offset here for fabrics like
2303 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2304 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2305 */
4949314c
AG		 2306 if (!cmd->t_data_nents)
2307 return NULL;
3717ef0c
PB		 2308
2309 BUG_ON(!sg);
2310 if (cmd->t_data_nents == 1)
4949314c
AG		 2311 return kmap(sg_page(sg)) + sg->offset;
2312
2313 /* >1 page. use vmap */
2314 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2315 if (!pages)
4949314c
AG		 2316 return NULL;
2317
2318 /* convert sg[] to pages[] */
2319 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2320 pages[i] = sg_page(sg);
2321 }
2322
2323 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2324 kfree(pages);
de103c93 2325 if (!cmd->t_data_vmap)
4949314c
AG		 2326 return NULL;
2327
2328 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2329}
4949314c 2330EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2331
4949314c 2332void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2333{
a1edf9cf 2334 if (!cmd->t_data_nents) {
4949314c 2335 return;
a1edf9cf 2336 } else if (cmd->t_data_nents == 1) {
4949314c 2337 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2338 return;
2339 }
4949314c
AG		 2340
2341 vunmap(cmd->t_data_vmap);
2342 cmd->t_data_vmap = NULL;
05d1c7c0 2343}
4949314c 2344EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2345
c5ff8d6b 2346int
20093994 2347target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
e64aa657 2348 bool zero_page, bool chainable)
c66ac9db 2349{
20093994 2350 struct scatterlist *sg;
ec98f782 2351 struct page *page;
20093994 2352 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
e64aa657 2353 unsigned int nalloc, nent;
ec98f782 2354 int i = 0;
c66ac9db 2355
e64aa657
CH		 2356 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2357 if (chainable)
2358 nalloc++;
2359 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
20093994 2360 if (!sg)
ec98f782 2361 return -ENOMEM;
c66ac9db 2362
e64aa657 2363 sg_init_table(sg, nalloc);
9db9da33 2364
ec98f782
AG		 2365 while (length) {
2366 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2367 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2368 if (!page)
2369 goto out;
c66ac9db 2370
20093994 2371 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2372 length -= page_len;
2373 i++;
c66ac9db 2374 }
20093994
NB		 2375 *sgl = sg;
2376 *nents = nent;
c66ac9db 2377 return 0;
c66ac9db 2378
ec98f782 2379out:
d0e27c88 2380 while (i > 0) {
ec98f782 2381 i--;
20093994 2382 __free_page(sg_page(&sg[i]));
c66ac9db 2383 }
20093994 2384 kfree(sg);
ec98f782 2385 return -ENOMEM;
c66ac9db 2386}
e64aa657 2387EXPORT_SYMBOL(target_alloc_sgl);
c66ac9db 2388
da0f7619 2389/*
b16a35b0
AG		 2390 * Allocate any required resources to execute the command. For writes we
2391 * might not have the payload yet, so notify the fabric via a call to
2392 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2393 */
de103c93
CH		 2394sense_reason_t
2395transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2396{
b1a2ecda 2397 unsigned long flags;
c66ac9db 2398 int ret = 0;
c8e63985 2399 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2400
5835812f
AM		 2401 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2402 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2403 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
e64aa657 2404 cmd->prot_length, true, false);
5835812f
AM		 2405 if (ret < 0)
2406 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2407 }
2408
c66ac9db
NB		 2409 /*
2410 * Determine is the TCM fabric module has already allocated physical
2411 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2412 * beforehand.
c66ac9db 2413 */
ec98f782
AG		 2414 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2415 cmd->data_length) {
20093994 2416
8cefe07b
NB		 2417 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2418 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2419 u32 bidi_length;
2420
2421 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2422 bidi_length = cmd->t_task_nolb *
2423 cmd->se_dev->dev_attrib.block_size;
2424 else
2425 bidi_length = cmd->data_length;
2426
2427 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2428 &cmd->t_bidi_data_nents,
e64aa657 2429 bidi_length, zero_flag, false);
8cefe07b
NB		 2430 if (ret < 0)
2431 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2432 }
2433
20093994 2434 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
e64aa657 2435 cmd->data_length, zero_flag, false);
c66ac9db 2436 if (ret < 0)
de103c93 2437 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2438 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2439 cmd->data_length) {
2440 /*
2441 * Special case for COMPARE_AND_WRITE with fabrics
2442 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2443 */
2444 u32 caw_length = cmd->t_task_nolb *
2445 cmd->se_dev->dev_attrib.block_size;
2446
2447 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2448 &cmd->t_bidi_data_nents,
e64aa657 2449 caw_length, zero_flag, false);
c8e63985
NB		 2450 if (ret < 0)
2451 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2452 }
c66ac9db 2453 /*
c3196f0c
CH		 2454 * If this command is not a write we can execute it right here,
2455 * for write buffers we need to notify the fabric driver first
2456 * and let it call back once the write buffers are ready.
c66ac9db 2457 */
5f41a31d 2458 target_add_to_state_list(cmd);
885e7b0e 2459 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2460 target_execute_cmd(cmd);
2461 return 0;
2462 }
b1a2ecda
BVA		 2463
2464 spin_lock_irqsave(&cmd->t_state_lock, flags);
2465 cmd->t_state = TRANSPORT_WRITE_PENDING;
2466 /*
2467 * Determine if frontend context caller is requesting the stopping of
2468 * this command for frontend exceptions.
2469 */
2470 if (cmd->transport_state & CMD_T_STOP) {
2471 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
2472 __func__, __LINE__, cmd->tag);
2473
2474 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2475
2476 complete_all(&cmd->t_transport_stop_comp);
a5eb307f 2477 return 0;
b1a2ecda
BVA		 2478 }
2479 cmd->transport_state &= ~CMD_T_ACTIVE;
2480 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c3196f0c
CH		 2481
2482 ret = cmd->se_tfo->write_pending(cmd);
fa7e25cf 2483 if (ret)
c3196f0c
CH		 2484 goto queue_full;
2485
fa7e25cf 2486 return 0;
da0f7619 2487
c3196f0c
CH		 2488queue_full:
2489 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
fa7e25cf 2490 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
c3196f0c 2491 return 0;
c66ac9db 2492}
a1d8b49a 2493EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2494
e057f533 2495static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2496{
f147abb4
NB		 2497 int ret;
2498
2499 ret = cmd->se_tfo->write_pending(cmd);
fa7e25cf 2500 if (ret) {
e057f533
CH		 2501 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2502 cmd);
fa7e25cf 2503 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
e057f533 2504 }
07bde79a
NB		 2505}
2506
0f4a9431
NB		 2507static bool
2508__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2509 unsigned long *flags);
2510
2511static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2512{
2513 unsigned long flags;
2514
2515 spin_lock_irqsave(&cmd->t_state_lock, flags);
2516 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2517 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2518}
2519
d5ddad41 2520int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2521{
d5ddad41 2522 int ret = 0;
0f4a9431 2523 bool aborted = false, tas = false;
d5ddad41 2524
d14921d6 2525 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2526 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2527 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2528
0f4a9431
NB		 2529 if (!aborted || tas)
2530 ret = transport_put_cmd(cmd);
d14921d6
NB		 2531 } else {
2532 if (wait_for_tasks)
0f4a9431 2533 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2534 /*
2535 * Handle WRITE failure case where transport_generic_new_cmd()
2536 * has already added se_cmd to state_list, but fabric has
2537 * failed command before I/O submission.
2538 */
febe562c 2539 if (cmd->state_active)
c130480b 2540 target_remove_from_state_list(cmd);
d14921d6 2541
82f1c8a4 2542 if (cmd->se_lun)
c66ac9db 2543 transport_lun_remove_cmd(cmd);
c66ac9db 2544
0f4a9431
NB		 2545 if (!aborted || tas)
2546 ret = transport_put_cmd(cmd);
2547 }
2548 /*
2549 * If the task has been internally aborted due to TMR ABORT_TASK
2550 * or LUN_RESET, target_core_tmr.c is responsible for performing
2551 * the remaining calls to target_put_sess_cmd(), and not the
2552 * callers of this function.
2553 */
2554 if (aborted) {
2555 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2556 wait_for_completion(&cmd->cmd_wait_comp);
2557 cmd->se_tfo->release_cmd(cmd);
2558 ret = 1;
c66ac9db 2559 }
d5ddad41 2560 return ret;
c66ac9db
NB		 2561}
2562EXPORT_SYMBOL(transport_generic_free_cmd);
2563
a17f091d 2564/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2565 * @se_cmd: command descriptor to add
a6360785 2566 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2567 */
afc16604 2568int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2569{
afc16604 2570 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2571 unsigned long flags;
bc187ea6 2572 int ret = 0;
a17f091d 2573
a6360785
NB		 2574 /*
2575 * Add a second kref if the fabric caller is expecting to handle
2576 * fabric acknowledgement that requires two target_put_sess_cmd()
2577 * invocations before se_cmd descriptor release.
2578 */
527268df 2579 if (ack_kref) {
1b4c59b7
HR		 2580 if (!kref_get_unless_zero(&se_cmd->cmd_kref))
2581 return -EINVAL;
2582
527268df
NB		 2583 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2584 }
7481deb4 2585
a17f091d 2586 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2587 if (se_sess->sess_tearing_down) {
2588 ret = -ESHUTDOWN;
2589 goto out;
2590 }
a17f091d 2591 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2592out:
a17f091d 2593 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2594
2595 if (ret && ack_kref)
afc16604 2596 target_put_sess_cmd(se_cmd);
7544e597 2597
bc187ea6 2598 return ret;
a17f091d 2599}
20361e69 2600EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2601
febe562c
NB		 2602static void target_free_cmd_mem(struct se_cmd *cmd)
2603{
2604 transport_free_pages(cmd);
2605
2606 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2607 core_tmr_release_req(cmd->se_tmr_req);
2608 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2609 kfree(cmd->t_task_cdb);
2610}
2611
7481deb4 2612static void target_release_cmd_kref(struct kref *kref)
a17f091d 2613{
7481deb4
NB		 2614 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2615 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2616 unsigned long flags;
0f4a9431 2617 bool fabric_stop;
a17f091d 2618
6b6427b6
BVA		 2619 if (se_sess) {
2620 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2621
2622 spin_lock(&se_cmd->t_state_lock);
2623 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2624 (se_cmd->transport_state & CMD_T_ABORTED);
2625 spin_unlock(&se_cmd->t_state_lock);
2626
2627 if (se_cmd->cmd_wait_set || fabric_stop) {
2628 list_del_init(&se_cmd->se_cmd_list);
2629 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2630 target_free_cmd_mem(se_cmd);
2631 complete(&se_cmd->cmd_wait_comp);
2632 return;
2633 }
0f4a9431 2634 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2635 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2636 }
a17f091d 2637
febe562c 2638 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2639 se_cmd->se_tfo->release_cmd(se_cmd);
2640}
2641
6b6427b6
BVA		 2642/**
2643 * target_put_sess_cmd - decrease the command reference count
2644 * @se_cmd: command to drop a reference from
2645 *
2646 * Returns 1 if and only if this target_put_sess_cmd() call caused the
2647 * refcount to drop to zero. Returns zero otherwise.
7481deb4 2648 */
afc16604 2649int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2650{
9ff9d15e 2651 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2652}
2653EXPORT_SYMBOL(target_put_sess_cmd);
2654
1c7b13fe
RD		 2655/* target_sess_cmd_list_set_waiting - Flag all commands in
2656 * sess_cmd_list to complete cmd_wait_comp. Set
2657 * sess_tearing_down so no more commands are queued.
2658 * @se_sess: session to flag
a17f091d 2659 */
1c7b13fe 2660void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d 2661{
1b4c59b7 2662 struct se_cmd *se_cmd, *tmp_cmd;
a17f091d 2663 unsigned long flags;
0f4a9431 2664 int rc;
a17f091d 2665
a17f091d 2666 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2667 if (se_sess->sess_tearing_down) {
2668 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2669 return;
2670 }
1c7b13fe 2671 se_sess->sess_tearing_down = 1;
9b31a328 2672 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2673
1b4c59b7
HR		 2674 list_for_each_entry_safe(se_cmd, tmp_cmd,
2675 &se_sess->sess_wait_list, se_cmd_list) {
0f4a9431
NB		 2676 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2677 if (rc) {
2678 se_cmd->cmd_wait_set = 1;
2679 spin_lock(&se_cmd->t_state_lock);
2680 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2681 spin_unlock(&se_cmd->t_state_lock);
1b4c59b7
HR		 2682 } else
2683 list_del_init(&se_cmd->se_cmd_list);
0f4a9431 2684 }
a17f091d
NB		 2685
2686 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2687}
1c7b13fe 2688EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2689
2690/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2691 * @se_sess: session to wait for active I/O
a17f091d 2692 */
be646c2d 2693void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2694{
2695 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2696 unsigned long flags;
0f4a9431 2697 bool tas;
a17f091d
NB		 2698
2699 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2700 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2701 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2702 " %d\n", se_cmd, se_cmd->t_state,
2703 se_cmd->se_tfo->get_cmd_state(se_cmd));
2704
0f4a9431
NB		 2705 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2706 tas = (se_cmd->transport_state & CMD_T_TAS);
2707 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2708
2709 if (!target_put_sess_cmd(se_cmd)) {
2710 if (tas)
2711 target_put_sess_cmd(se_cmd);
2712 }
2713
be646c2d
JE		 2714 wait_for_completion(&se_cmd->cmd_wait_comp);
2715 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2716 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2717 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2718
2719 se_cmd->se_tfo->release_cmd(se_cmd);
2720 }
9b31a328
NB		 2721
2722 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2723 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2724 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2725
a17f091d
NB		 2726}
2727EXPORT_SYMBOL(target_wait_for_sess_cmds);
2728
bd4e2d29
NB		 2729static void target_lun_confirm(struct percpu_ref *ref)
2730{
2731 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
2732
2733 complete(&lun->lun_ref_comp);
2734}
2735
b3eeea66 2736void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2737{
bd4e2d29
NB		 2738 /*
2739 * Mark the percpu-ref as DEAD, switch to atomic_t mode, drop
2740 * the initial reference and schedule confirm kill to be
2741 * executed after one full RCU grace period has completed.
2742 */
2743 percpu_ref_kill_and_confirm(&lun->lun_ref, target_lun_confirm);
2744 /*
2745 * The first completion waits for percpu_ref_switch_to_atomic_rcu()
2746 * to call target_lun_confirm after lun->lun_ref has been marked
2747 * as __PERCPU_REF_DEAD on all CPUs, and switches to atomic_t
2748 * mode so that percpu_ref_tryget_live() lookup of lun->lun_ref
2749 * fails for all new incoming I/O.
2750 */
5277797d 2751 wait_for_completion(&lun->lun_ref_comp);
bd4e2d29
NB		 2752 /*
2753 * The second completion waits for percpu_ref_put_many() to
2754 * invoke ->release() after lun->lun_ref has switched to
2755 * atomic_t mode, and lun->lun_ref.count has reached zero.
2756 *
2757 * At this point all target-core lun->lun_ref references have
2758 * been dropped via transport_lun_remove_cmd(), and it's safe
2759 * to proceed with the remaining LUN shutdown.
2760 */
2761 wait_for_completion(&lun->lun_shutdown_comp);
c66ac9db
NB		 2762}
2763
0f4a9431
NB		 2764static bool
2765__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2766 bool *aborted, bool *tas, unsigned long *flags)
2767 __releases(&cmd->t_state_lock)
2768 __acquires(&cmd->t_state_lock)
c66ac9db 2769{
c66ac9db 2770
0f4a9431
NB		 2771 assert_spin_locked(&cmd->t_state_lock);
2772 WARN_ON_ONCE(!irqs_disabled());
2773
2774 if (fabric_stop)
2775 cmd->transport_state |= CMD_T_FABRIC_STOP;
2776
2777 if (cmd->transport_state & CMD_T_ABORTED)
2778 *aborted = true;
2779
2780 if (cmd->transport_state & CMD_T_TAS)
2781 *tas = true;
2782
c8e31f26 2783 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2784 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2785 return false;
cb4f4d3c 2786
c8e31f26 2787 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2788 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2789 return false;
7d680f3b 2790
0f4a9431
NB		 2791 if (!(cmd->transport_state & CMD_T_ACTIVE))
2792 return false;
2793
2794 if (fabric_stop && *aborted)
a17f091d 2795 return false;
c66ac9db 2796
7d680f3b 2797 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2798
0f4a9431
NB		 2799 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2800 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2801 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2802
0f4a9431 2803 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2804
a1d8b49a 2805 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2806
0f4a9431 2807 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2808 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2809
0f4a9431
NB		 2810 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2811 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2812
0f4a9431
NB		 2813 return true;
2814}
2815
2816/**
2d4760ee
BVA		 2817 * transport_wait_for_tasks - set CMD_T_STOP and wait for t_transport_stop_comp
2818 * @cmd: command to wait on
0f4a9431
NB		 2819 */
2820bool transport_wait_for_tasks(struct se_cmd *cmd)
2821{
2822 unsigned long flags;
2823 bool ret, aborted = false, tas = false;
2824
2825 spin_lock_irqsave(&cmd->t_state_lock, flags);
2826 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 2827 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2828
0f4a9431 2829 return ret;
c66ac9db 2830}
d14921d6 2831EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2832
ab78fef4
BVA		 2833struct sense_info {
2834 u8 key;
2835 u8 asc;
2836 u8 ascq;
2837 bool add_sector_info;
2838};
2839
2840static const struct sense_info sense_info_table[] = {
2841 [TCM_NO_SENSE] = {
2842 .key = NOT_READY
2843 },
2844 [TCM_NON_EXISTENT_LUN] = {
2845 .key = ILLEGAL_REQUEST,
2846 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2847 },
2848 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2849 .key = ILLEGAL_REQUEST,
2850 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2851 },
2852 [TCM_SECTOR_COUNT_TOO_MANY] = {
2853 .key = ILLEGAL_REQUEST,
2854 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2855 },
2856 [TCM_UNKNOWN_MODE_PAGE] = {
2857 .key = ILLEGAL_REQUEST,
2858 .asc = 0x24, /* INVALID FIELD IN CDB */
2859 },
2860 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2861 .key = ABORTED_COMMAND,
2862 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2863 .ascq = 0x03,
2864 },
2865 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2866 .key = ABORTED_COMMAND,
2867 .asc = 0x0c, /* WRITE ERROR */
2868 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2869 },
2870 [TCM_INVALID_CDB_FIELD] = {
2871 .key = ILLEGAL_REQUEST,
2872 .asc = 0x24, /* INVALID FIELD IN CDB */
2873 },
2874 [TCM_INVALID_PARAMETER_LIST] = {
2875 .key = ILLEGAL_REQUEST,
2876 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2877 },
e8642120
DD		 2878 [TCM_TOO_MANY_TARGET_DESCS] = {
2879 .key = ILLEGAL_REQUEST,
2880 .asc = 0x26,
2881 .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */
2882 },
2883 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = {
2884 .key = ILLEGAL_REQUEST,
2885 .asc = 0x26,
2886 .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */
2887 },
2888 [TCM_TOO_MANY_SEGMENT_DESCS] = {
2889 .key = ILLEGAL_REQUEST,
2890 .asc = 0x26,
2891 .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */
2892 },
2893 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = {
2894 .key = ILLEGAL_REQUEST,
2895 .asc = 0x26,
2896 .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */
2897 },
ab78fef4
BVA		 2898 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2899 .key = ILLEGAL_REQUEST,
2900 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2901 },
2902 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2903 .key = ILLEGAL_REQUEST,
2904 .asc = 0x0c, /* WRITE ERROR */
2905 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2906 },
2907 [TCM_SERVICE_CRC_ERROR] = {
2908 .key = ABORTED_COMMAND,
2909 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2910 .ascq = 0x05, /* N/A */
2911 },
2912 [TCM_SNACK_REJECTED] = {
2913 .key = ABORTED_COMMAND,
2914 .asc = 0x11, /* READ ERROR */
2915 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2916 },
2917 [TCM_WRITE_PROTECTED] = {
2918 .key = DATA_PROTECT,
2919 .asc = 0x27, /* WRITE PROTECTED */
2920 },
2921 [TCM_ADDRESS_OUT_OF_RANGE] = {
2922 .key = ILLEGAL_REQUEST,
2923 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2924 },
2925 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2926 .key = UNIT_ATTENTION,
2927 },
2928 [TCM_CHECK_CONDITION_NOT_READY] = {
2929 .key = NOT_READY,
2930 },
2931 [TCM_MISCOMPARE_VERIFY] = {
2932 .key = MISCOMPARE,
2933 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2934 .ascq = 0x00,
2935 },
2936 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2937 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2938 .asc = 0x10,
2939 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2940 .add_sector_info = true,
2941 },
2942 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2943 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2944 .asc = 0x10,
2945 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2946 .add_sector_info = true,
2947 },
2948 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2949 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2950 .asc = 0x10,
2951 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2952 .add_sector_info = true,
2953 },
449a1378
NB		 2954 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
2955 .key = COPY_ABORTED,
2956 .asc = 0x0d,
2957 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
2958
2959 },
ab78fef4
BVA		 2960 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2961 /*
2962 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2963 * Solaris initiators. Returning NOT READY instead means the
2964 * operations will be retried a finite number of times and we
2965 * can survive intermittent errors.
2966 */
2967 .key = NOT_READY,
2968 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2969 },
2970};
2971
f5a8b3a7 2972static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2973{
2974 const struct sense_info *si;
2975 u8 *buffer = cmd->sense_buffer;
2976 int r = (__force int)reason;
2977 u8 asc, ascq;
4e4937e8 2978 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2979
2980 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2981 si = &sense_info_table[r];
2982 else
2983 si = &sense_info_table[(__force int)
2984 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2985
ab78fef4
BVA		 2986 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2987 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2988 WARN_ON_ONCE(asc == 0);
2989 } else if (si->asc == 0) {
2990 WARN_ON_ONCE(cmd->scsi_asc == 0);
2991 asc = cmd->scsi_asc;
2992 ascq = cmd->scsi_ascq;
2993 } else {
2994 asc = si->asc;
2995 ascq = si->ascq;
2996 }
9ec1e1ce 2997
4e4937e8 2998 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 2999 if (si->add_sector_info)
f5a8b3a7
SG		 3000 return scsi_set_sense_information(buffer,
3001 cmd->scsi_sense_length,
3002 cmd->bad_sector);
3003
3004 return 0;
ab78fef4
BVA		 3005}
3006
de103c93
CH		 3007int
3008transport_send_check_condition_and_sense(struct se_cmd *cmd,
3009 sense_reason_t reason, int from_transport)
c66ac9db 3010{
c66ac9db 3011 unsigned long flags;
c66ac9db 3012
a1d8b49a 3013 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3014 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 3015 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3016 return 0;
3017 }
3018 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 3019 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3020
ab78fef4 3021 if (!from_transport) {
f5a8b3a7
SG		 3022 int rc;
3023
c66ac9db 3024 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 3025 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3026 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 3027 rc = translate_sense_reason(cmd, reason);
3028 if (rc)
3029 return rc;
c66ac9db 3030 }
c66ac9db 3031
e5c0d6ad 3032 trace_target_cmd_complete(cmd);
07bde79a 3033 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3034}
3035EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3036
310d3d31
NB		 3037static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3038 __releases(&cmd->t_state_lock)
3039 __acquires(&cmd->t_state_lock)
c66ac9db 3040{
fa7e25cf
NB		 3041 int ret;
3042
310d3d31
NB		 3043 assert_spin_locked(&cmd->t_state_lock);
3044 WARN_ON_ONCE(!irqs_disabled());
3045
c18bc7d8
RD		 3046 if (!(cmd->transport_state & CMD_T_ABORTED))
3047 return 0;
68259b5a
AL		 3048 /*
3049 * If cmd has been aborted but either no status is to be sent or it has
3050 * already been sent, just return
3051 */
310d3d31
NB		 3052 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
3053 if (send_status)
3054 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 3055 return 1;
310d3d31 3056 }
8b1e1244 3057
310d3d31
NB		 3058 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
3059 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3060
68259b5a 3061 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 3062 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 3063 trace_target_cmd_complete(cmd);
310d3d31
NB		 3064
3065 spin_unlock_irq(&cmd->t_state_lock);
fa7e25cf
NB		 3066 ret = cmd->se_tfo->queue_status(cmd);
3067 if (ret)
3068 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
310d3d31 3069 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 3070
3071 return 1;
c66ac9db 3072}
310d3d31
NB		 3073
3074int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3075{
3076 int ret;
3077
3078 spin_lock_irq(&cmd->t_state_lock);
3079 ret = __transport_check_aborted_status(cmd, send_status);
3080 spin_unlock_irq(&cmd->t_state_lock);
3081
3082 return ret;
3083}
c66ac9db
NB		 3084EXPORT_SYMBOL(transport_check_aborted_status);
3085
3086void transport_send_task_abort(struct se_cmd *cmd)
3087{
c252f003 3088 unsigned long flags;
fa7e25cf 3089 int ret;
c252f003
NB		 3090
3091 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 3092 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 3093 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3094 return;
3095 }
3096 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3097
c66ac9db
NB		 3098 /*
3099 * If there are still expected incoming fabric WRITEs, we wait
3100 * until until they have completed before sending a TASK_ABORTED
3101 * response. This response with TASK_ABORTED status will be
3102 * queued back to fabric module by transport_check_aborted_status().
3103 */
3104 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3105 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 3106 spin_lock_irqsave(&cmd->t_state_lock, flags);
3107 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3108 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3109 goto send_abort;
3110 }
68259b5a 3111 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 3112 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 3113 return;
c66ac9db
NB		 3114 }
3115 }
310d3d31 3116send_abort:
c66ac9db 3117 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3118
72b59d6e
RD		 3119 transport_lun_remove_cmd(cmd);
3120
649ee054
BVA		 3121 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3122 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3123
e5c0d6ad 3124 trace_target_cmd_complete(cmd);
fa7e25cf
NB		 3125 ret = cmd->se_tfo->queue_status(cmd);
3126 if (ret)
3127 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 3128}
3129
af877292 3130static void target_tmr_work(struct work_struct *work)
c66ac9db 3131{
af877292 3132 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3133 struct se_device *dev = cmd->se_dev;
c66ac9db 3134 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 3135 unsigned long flags;
c66ac9db
NB		 3136 int ret;
3137
a6d9bb1c
NB		 3138 spin_lock_irqsave(&cmd->t_state_lock, flags);
3139 if (cmd->transport_state & CMD_T_ABORTED) {
3140 tmr->response = TMR_FUNCTION_REJECTED;
3141 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3142 goto check_stop;
3143 }
3144 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3145
c66ac9db 3146 switch (tmr->function) {
5c6cd613 3147 case TMR_ABORT_TASK:
3d28934a 3148 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3149 break;
5c6cd613
NB		 3150 case TMR_ABORT_TASK_SET:
3151 case TMR_CLEAR_ACA:
3152 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3153 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3154 break;
5c6cd613 3155 case TMR_LUN_RESET:
c66ac9db
NB		 3156 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3157 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3158 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3159 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3160 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3161 cmd->orig_fe_lun, 0x29,
3162 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3163 }
c66ac9db 3164 break;
5c6cd613 3165 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3166 tmr->response = TMR_FUNCTION_REJECTED;
3167 break;
5c6cd613 3168 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3169 tmr->response = TMR_FUNCTION_REJECTED;
3170 break;
c66ac9db 3171 default:
6708bb27 3172 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3173 tmr->function);
3174 tmr->response = TMR_FUNCTION_REJECTED;
3175 break;
3176 }
3177
a6d9bb1c
NB		 3178 spin_lock_irqsave(&cmd->t_state_lock, flags);
3179 if (cmd->transport_state & CMD_T_ABORTED) {
3180 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3181 goto check_stop;
3182 }
a6d9bb1c
NB		 3183 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3184
e3d6f909 3185 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3186
a6d9bb1c 3187check_stop:
b7b8bef7 3188 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3189}
3190
af877292
CH		 3191int transport_generic_handle_tmr(
3192 struct se_cmd *cmd)
c66ac9db 3193{
f15e9cd9 3194 unsigned long flags;
c54eeffb 3195 bool aborted = false;
f15e9cd9
NB		 3196
3197 spin_lock_irqsave(&cmd->t_state_lock, flags);
c54eeffb
NB		 3198 if (cmd->transport_state & CMD_T_ABORTED) {
3199 aborted = true;
3200 } else {
3201 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3202 cmd->transport_state |= CMD_T_ACTIVE;
3203 }
f15e9cd9
NB		 3204 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3205
c54eeffb
NB		 3206 if (aborted) {
3207 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
3208 "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
3209 cmd->se_tmr_req->ref_task_tag, cmd->tag);
3210 transport_cmd_check_stop_to_fabric(cmd);
3211 return 0;
3212 }
3213
af877292
CH		 3214 INIT_WORK(&cmd->work, target_tmr_work);
3215 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3216 return 0;
3217}
af877292 3218EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3219
3220bool
3221target_check_wce(struct se_device *dev)
3222{
3223 bool wce = false;
3224
3225 if (dev->transport->get_write_cache)
3226 wce = dev->transport->get_write_cache(dev);
3227 else if (dev->dev_attrib.emulate_write_cache > 0)
3228 wce = true;
3229
3230 return wce;
3231}
3232
3233bool
3234target_check_fua(struct se_device *dev)
3235{
3236 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3237}
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