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[mirror_ubuntu-zesty-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);
cef0c280 67static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason);
07bde79a 68static void transport_handle_queue_full(struct se_cmd *cmd,
cef0c280 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 if (cmd->transport_state & CMD_T_BUSY)
598 return;
c66ac9db 599
cf572a96
CH		 600 spin_lock_irqsave(&dev->execute_task_lock, flags);
601 if (cmd->state_active) {
602 list_del(&cmd->state_list);
cf572a96 603 cmd->state_active = false;
c66ac9db 604 }
cf572a96 605 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 606}
607
862e6389
NB		 608static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
609 bool write_pending)
c66ac9db
NB		 610{
611 unsigned long flags;
612
f7113a47
CH		 613 if (remove_from_lists) {
614 target_remove_from_state_list(cmd);
615
616 /*
617 * Clear struct se_cmd->se_lun before the handoff to FE.
618 */
619 cmd->se_lun = NULL;
620 }
621
febe562c
NB		 622 spin_lock_irqsave(&cmd->t_state_lock, flags);
623 if (write_pending)
624 cmd->t_state = TRANSPORT_WRITE_PENDING;
625
c66ac9db
NB		 626 /*
627 * Determine if frontend context caller is requesting the stopping of
e3d6f909 628 * this command for frontend exceptions.
c66ac9db 629 */
7d680f3b 630 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 631 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
632 __func__, __LINE__, cmd->tag);
c66ac9db 633
a1d8b49a 634 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 635
a95d6511 636 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 637 return 1;
638 }
f7113a47
CH		 639
640 cmd->transport_state &= ~CMD_T_ACTIVE;
641 if (remove_from_lists) {
642 /*
643 * Some fabric modules like tcm_loop can release
644 * their internally allocated I/O reference now and
645 * struct se_cmd now.
646 *
647 * Fabric modules are expected to return '1' here if the
648 * se_cmd being passed is released at this point,
649 * or zero if not being released.
650 */
651 if (cmd->se_tfo->check_stop_free != NULL) {
652 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
653 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 654 }
f7113a47 655 }
c66ac9db 656
a1d8b49a 657 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 658 return 0;
659}
660
661static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
662{
862e6389 663 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 664}
665
666static void transport_lun_remove_cmd(struct se_cmd *cmd)
667{
e3d6f909 668 struct se_lun *lun = cmd->se_lun;
c66ac9db 669
5259a06e 670 if (!lun)
c66ac9db
NB		 671 return;
672
5259a06e
NB		 673 if (cmpxchg(&cmd->lun_ref_active, true, false))
674 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 675}
676
677void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
678{
febe562c
NB		 679 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
680
68259b5a
AL		 681 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
682 transport_lun_remove_cmd(cmd);
131e6abc
NB		 683 /*
684 * Allow the fabric driver to unmap any resources before
685 * releasing the descriptor via TFO->release_cmd()
686 */
687 if (remove)
688 cmd->se_tfo->aborted_task(cmd);
68259b5a 689
c66ac9db
NB		 690 if (transport_cmd_check_stop_to_fabric(cmd))
691 return;
febe562c 692 if (remove && ack_kref)
e6a2573f 693 transport_put_cmd(cmd);
c66ac9db
NB		 694}
695
35e0e757
CH		 696static void target_complete_failure_work(struct work_struct *work)
697{
698 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
699
de103c93
CH		 700 transport_generic_request_failure(cmd,
701 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 702}
703
6138ed2a 704/*
d5829eac
PB		 705 * Used when asking transport to copy Sense Data from the underlying
706 * Linux/SCSI struct scsi_cmnd
6138ed2a 707 */
d5829eac 708static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 709{
6138ed2a 710 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 711
712 WARN_ON(!cmd->se_lun);
713
714 if (!dev)
d5829eac 715 return NULL;
6138ed2a 716
d5829eac
PB		 717 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
718 return NULL;
6138ed2a 719
9c58b7dd 720 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 721
d5829eac 722 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 723 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 724 return cmd->sense_buffer;
6138ed2a
PB		 725}
726
5787cacd 727void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 728{
42bf829e 729 struct se_device *dev = cmd->se_dev;
5787cacd 730 int success = scsi_status == GOOD;
c66ac9db 731 unsigned long flags;
c66ac9db 732
5787cacd
CH		 733 cmd->scsi_status = scsi_status;
734
735
a1d8b49a 736 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 737 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 738
c66ac9db 739 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 740 dev->transport->transport_complete(cmd,
741 cmd->t_data_sg,
742 transport_get_sense_buffer(cmd));
743 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 744 success = 1;
c66ac9db
NB		 745 }
746
3d28934a 747 /*
125d0119 748 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 749 * and transport_wait_for_tasks() will be waiting for completion..
750 */
febe562c 751 if (cmd->transport_state & CMD_T_ABORTED ||
3d28934a
NB		 752 cmd->transport_state & CMD_T_STOP) {
753 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 754 complete_all(&cmd->t_transport_stop_comp);
3d28934a 755 return;
3dca1471 756 } else if (!success) {
35e0e757 757 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 758 } else {
35e0e757 759 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 760 }
35e0e757 761
35e0e757 762 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 763 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 764 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 765
9095adaa 766 if (cmd->se_cmd_flags & SCF_USE_CPUID)
fb3269ba 767 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
9095adaa
QT		 768 else
769 queue_work(target_completion_wq, &cmd->work);
c66ac9db 770}
6bb35e00
CH		 771EXPORT_SYMBOL(target_complete_cmd);
772
2426bd45
RD		 773void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
774{
61f36166 775 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
2426bd45
RD		 776 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
777 cmd->residual_count += cmd->data_length - length;
778 } else {
779 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
780 cmd->residual_count = cmd->data_length - length;
781 }
782
783 cmd->data_length = length;
784 }
785
786 target_complete_cmd(cmd, scsi_status);
787}
788EXPORT_SYMBOL(target_complete_cmd_with_length);
789
cf572a96 790static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 791{
cf572a96
CH		 792 struct se_device *dev = cmd->se_dev;
793 unsigned long flags;
c66ac9db 794
cf572a96
CH		 795 spin_lock_irqsave(&dev->execute_task_lock, flags);
796 if (!cmd->state_active) {
797 list_add_tail(&cmd->state_list, &dev->state_list);
798 cmd->state_active = true;
c66ac9db 799 }
cf572a96 800 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 801}
802
07bde79a 803/*
f147abb4 804 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 805 */
7a6f0a1e
CH		 806static void transport_write_pending_qf(struct se_cmd *cmd);
807static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 808
0fd97ccf 809void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 810{
811 struct se_device *dev = container_of(work, struct se_device,
812 qf_work_queue);
bcac364a 813 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 814 struct se_cmd *cmd, *cmd_tmp;
815
816 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 817 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
818 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 819
bcac364a 820 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 821 list_del(&cmd->se_qf_node);
33940d09 822 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 823
6708bb27 824 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 825 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 826 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 827 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
828 : "UNKNOWN");
f7a5cc0b 829
7a6f0a1e
CH		 830 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
831 transport_write_pending_qf(cmd);
cef0c280
NB		 832 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK ||
833 cmd->t_state == TRANSPORT_COMPLETE_QF_ERR)
7a6f0a1e 834 transport_complete_qf(cmd);
07bde79a 835 }
07bde79a
NB		 836}
837
c66ac9db
NB		 838unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
839{
840 switch (cmd->data_direction) {
841 case DMA_NONE:
842 return "NONE";
843 case DMA_FROM_DEVICE:
844 return "READ";
845 case DMA_TO_DEVICE:
846 return "WRITE";
847 case DMA_BIDIRECTIONAL:
848 return "BIDI";
849 default:
850 break;
851 }
852
853 return "UNKNOWN";
854}
855
856void transport_dump_dev_state(
857 struct se_device *dev,
858 char *b,
859 int *bl)
860{
861 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 862 if (dev->export_count)
c66ac9db 863 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 864 else
c66ac9db 865 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 866
5f41a31d 867 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 868 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 869 dev->dev_attrib.block_size,
870 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 871 *bl += sprintf(b + *bl, " ");
872}
873
c66ac9db
NB		 874void transport_dump_vpd_proto_id(
875 struct t10_vpd *vpd,
876 unsigned char *p_buf,
877 int p_buf_len)
878{
879 unsigned char buf[VPD_TMP_BUF_SIZE];
880 int len;
881
882 memset(buf, 0, VPD_TMP_BUF_SIZE);
883 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
884
885 switch (vpd->protocol_identifier) {
886 case 0x00:
887 sprintf(buf+len, "Fibre Channel\n");
888 break;
889 case 0x10:
890 sprintf(buf+len, "Parallel SCSI\n");
891 break;
892 case 0x20:
893 sprintf(buf+len, "SSA\n");
894 break;
895 case 0x30:
896 sprintf(buf+len, "IEEE 1394\n");
897 break;
898 case 0x40:
899 sprintf(buf+len, "SCSI Remote Direct Memory Access"
900 " Protocol\n");
901 break;
902 case 0x50:
903 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
904 break;
905 case 0x60:
906 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
907 break;
908 case 0x70:
909 sprintf(buf+len, "Automation/Drive Interface Transport"
910 " Protocol\n");
911 break;
912 case 0x80:
913 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
914 break;
915 default:
916 sprintf(buf+len, "Unknown 0x%02x\n",
917 vpd->protocol_identifier);
918 break;
919 }
920
921 if (p_buf)
922 strncpy(p_buf, buf, p_buf_len);
923 else
6708bb27 924 pr_debug("%s", buf);
c66ac9db
NB		 925}
926
927void
928transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
929{
930 /*
931 * Check if the Protocol Identifier Valid (PIV) bit is set..
932 *
933 * from spc3r23.pdf section 7.5.1
934 */
935 if (page_83[1] & 0x80) {
936 vpd->protocol_identifier = (page_83[0] & 0xf0);
937 vpd->protocol_identifier_set = 1;
938 transport_dump_vpd_proto_id(vpd, NULL, 0);
939 }
940}
941EXPORT_SYMBOL(transport_set_vpd_proto_id);
942
943int transport_dump_vpd_assoc(
944 struct t10_vpd *vpd,
945 unsigned char *p_buf,
946 int p_buf_len)
947{
948 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 949 int ret = 0;
950 int len;
c66ac9db
NB		 951
952 memset(buf, 0, VPD_TMP_BUF_SIZE);
953 len = sprintf(buf, "T10 VPD Identifier Association: ");
954
955 switch (vpd->association) {
956 case 0x00:
957 sprintf(buf+len, "addressed logical unit\n");
958 break;
959 case 0x10:
960 sprintf(buf+len, "target port\n");
961 break;
962 case 0x20:
963 sprintf(buf+len, "SCSI target device\n");
964 break;
965 default:
966 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 967 ret = -EINVAL;
c66ac9db
NB		 968 break;
969 }
970
971 if (p_buf)
972 strncpy(p_buf, buf, p_buf_len);
973 else
6708bb27 974 pr_debug("%s", buf);
c66ac9db
NB		 975
976 return ret;
977}
978
979int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
980{
981 /*
982 * The VPD identification association..
983 *
984 * from spc3r23.pdf Section 7.6.3.1 Table 297
985 */
986 vpd->association = (page_83[1] & 0x30);
987 return transport_dump_vpd_assoc(vpd, NULL, 0);
988}
989EXPORT_SYMBOL(transport_set_vpd_assoc);
990
991int transport_dump_vpd_ident_type(
992 struct t10_vpd *vpd,
993 unsigned char *p_buf,
994 int p_buf_len)
995{
996 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 997 int ret = 0;
998 int len;
c66ac9db
NB		 999
1000 memset(buf, 0, VPD_TMP_BUF_SIZE);
1001 len = sprintf(buf, "T10 VPD Identifier Type: ");
1002
1003 switch (vpd->device_identifier_type) {
1004 case 0x00:
1005 sprintf(buf+len, "Vendor specific\n");
1006 break;
1007 case 0x01:
1008 sprintf(buf+len, "T10 Vendor ID based\n");
1009 break;
1010 case 0x02:
1011 sprintf(buf+len, "EUI-64 based\n");
1012 break;
1013 case 0x03:
1014 sprintf(buf+len, "NAA\n");
1015 break;
1016 case 0x04:
1017 sprintf(buf+len, "Relative target port identifier\n");
1018 break;
1019 case 0x08:
1020 sprintf(buf+len, "SCSI name string\n");
1021 break;
1022 default:
1023 sprintf(buf+len, "Unsupported: 0x%02x\n",
1024 vpd->device_identifier_type);
e3d6f909 1025 ret = -EINVAL;
c66ac9db
NB		 1026 break;
1027 }
1028
e3d6f909
AG		 1029 if (p_buf) {
1030 if (p_buf_len < strlen(buf)+1)
1031 return -EINVAL;
c66ac9db 1032 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1033 } else {
6708bb27 1034 pr_debug("%s", buf);
e3d6f909 1035 }
c66ac9db
NB		 1036
1037 return ret;
1038}
1039
1040int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1041{
1042 /*
1043 * The VPD identifier type..
1044 *
1045 * from spc3r23.pdf Section 7.6.3.1 Table 298
1046 */
1047 vpd->device_identifier_type = (page_83[1] & 0x0f);
1048 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1049}
1050EXPORT_SYMBOL(transport_set_vpd_ident_type);
1051
1052int transport_dump_vpd_ident(
1053 struct t10_vpd *vpd,
1054 unsigned char *p_buf,
1055 int p_buf_len)
1056{
1057 unsigned char buf[VPD_TMP_BUF_SIZE];
1058 int ret = 0;
1059
1060 memset(buf, 0, VPD_TMP_BUF_SIZE);
1061
1062 switch (vpd->device_identifier_code_set) {
1063 case 0x01: /* Binary */
703d641d
DC		 1064 snprintf(buf, sizeof(buf),
1065 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1066 &vpd->device_identifier[0]);
1067 break;
1068 case 0x02: /* ASCII */
703d641d
DC		 1069 snprintf(buf, sizeof(buf),
1070 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1071 &vpd->device_identifier[0]);
1072 break;
1073 case 0x03: /* UTF-8 */
703d641d
DC		 1074 snprintf(buf, sizeof(buf),
1075 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1076 &vpd->device_identifier[0]);
1077 break;
1078 default:
1079 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1080 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1081 ret = -EINVAL;
c66ac9db
NB		 1082 break;
1083 }
1084
1085 if (p_buf)
1086 strncpy(p_buf, buf, p_buf_len);
1087 else
6708bb27 1088 pr_debug("%s", buf);
c66ac9db
NB		 1089
1090 return ret;
1091}
1092
1093int
1094transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1095{
1096 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1097 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1098
1099 /*
1100 * The VPD Code Set (encoding)
1101 *
1102 * from spc3r23.pdf Section 7.6.3.1 Table 296
1103 */
1104 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1105 switch (vpd->device_identifier_code_set) {
1106 case 0x01: /* Binary */
1107 vpd->device_identifier[j++] =
1108 hex_str[vpd->device_identifier_type];
1109 while (i < (4 + page_83[3])) {
1110 vpd->device_identifier[j++] =
1111 hex_str[(page_83[i] & 0xf0) >> 4];
1112 vpd->device_identifier[j++] =
1113 hex_str[page_83[i] & 0x0f];
1114 i++;
1115 }
1116 break;
1117 case 0x02: /* ASCII */
1118 case 0x03: /* UTF-8 */
1119 while (i < (4 + page_83[3]))
1120 vpd->device_identifier[j++] = page_83[i++];
1121 break;
1122 default:
1123 break;
1124 }
1125
1126 return transport_dump_vpd_ident(vpd, NULL, 0);
1127}
1128EXPORT_SYMBOL(transport_set_vpd_ident);
1129
8f9b5654
NB		 1130static sense_reason_t
1131target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1132 unsigned int size)
1133{
1134 u32 mtl;
1135
1136 if (!cmd->se_tfo->max_data_sg_nents)
1137 return TCM_NO_SENSE;
1138 /*
1139 * Check if fabric enforced maximum SGL entries per I/O descriptor
1140 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1141 * residual_count and reduce original cmd->data_length to maximum
1142 * length based on single PAGE_SIZE entry scatter-lists.
1143 */
1144 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1145 if (cmd->data_length > mtl) {
1146 /*
1147 * If an existing CDB overflow is present, calculate new residual
1148 * based on CDB size minus fabric maximum transfer length.
1149 *
1150 * If an existing CDB underflow is present, calculate new residual
1151 * based on original cmd->data_length minus fabric maximum transfer
1152 * length.
1153 *
1154 * Otherwise, set the underflow residual based on cmd->data_length
1155 * minus fabric maximum transfer length.
1156 */
1157 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1158 cmd->residual_count = (size - mtl);
1159 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1160 u32 orig_dl = size + cmd->residual_count;
1161 cmd->residual_count = (orig_dl - mtl);
1162 } else {
1163 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1164 cmd->residual_count = (cmd->data_length - mtl);
1165 }
1166 cmd->data_length = mtl;
1167 /*
1168 * Reset sbc_check_prot() calculated protection payload
1169 * length based upon the new smaller MTL.
1170 */
1171 if (cmd->prot_length) {
1172 u32 sectors = (mtl / dev->dev_attrib.block_size);
1173 cmd->prot_length = dev->prot_length * sectors;
1174 }
1175 }
1176 return TCM_NO_SENSE;
1177}
1178
de103c93
CH		 1179sense_reason_t
1180target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1181{
1182 struct se_device *dev = cmd->se_dev;
1183
1184 if (cmd->unknown_data_length) {
1185 cmd->data_length = size;
1186 } else if (size != cmd->data_length) {
1187 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1188 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1189 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1190 cmd->data_length, size, cmd->t_task_cdb[0]);
1191
c72c5250
RD		 1192 if (cmd->data_direction == DMA_TO_DEVICE &&
1193 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1194 pr_err("Rejecting underflow/overflow WRITE data\n");
de103c93 1195 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1196 }
1197 /*
1198 * Reject READ_* or WRITE_* with overflow/underflow for
1199 * type SCF_SCSI_DATA_CDB.
1200 */
0fd97ccf 1201 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1202 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1203 " CDB on non 512-byte sector setup subsystem"
1204 " plugin: %s\n", dev->transport->name);
1205 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1206 return TCM_INVALID_CDB_FIELD;
9b3b8041 1207 }
4c054ba6
NB		 1208 /*
1209 * For the overflow case keep the existing fabric provided
1210 * ->data_length. Otherwise for the underflow case, reset
1211 * ->data_length to the smaller SCSI expected data transfer
1212 * length.
1213 */
9b3b8041
CH		 1214 if (size > cmd->data_length) {
1215 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1216 cmd->residual_count = (size - cmd->data_length);
1217 } else {
1218 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1219 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1220 cmd->data_length = size;
9b3b8041 1221 }
9b3b8041
CH		 1222 }
1223
8f9b5654 1224 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1225
9b3b8041
CH		 1226}
1227
c66ac9db
NB		 1228/*
1229 * Used by fabric modules containing a local struct se_cmd within their
1230 * fabric dependent per I/O descriptor.
649ee054
BVA		 1231 *
1232 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1233 */
1234void transport_init_se_cmd(
1235 struct se_cmd *cmd,
9ac8928e 1236 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1237 struct se_session *se_sess,
1238 u32 data_length,
1239 int data_direction,
1240 int task_attr,
1241 unsigned char *sense_buffer)
1242{
5951146d 1243 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1244 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1245 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1246 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1247 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1248 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1249 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1250 kref_init(&cmd->cmd_kref);
7d680f3b 1251 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1252
1253 cmd->se_tfo = tfo;
1254 cmd->se_sess = se_sess;
1255 cmd->data_length = data_length;
1256 cmd->data_direction = data_direction;
1257 cmd->sam_task_attr = task_attr;
1258 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1259
1260 cmd->state_active = false;
c66ac9db
NB		 1261}
1262EXPORT_SYMBOL(transport_init_se_cmd);
1263
de103c93
CH		 1264static sense_reason_t
1265transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1266{
019c4ca6
CH		 1267 struct se_device *dev = cmd->se_dev;
1268
c66ac9db
NB		 1269 /*
1270 * Check if SAM Task Attribute emulation is enabled for this
1271 * struct se_device storage object
1272 */
a3541703 1273 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1274 return 0;
1275
68d81f40 1276 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1277 pr_debug("SAM Task Attribute ACA"
c66ac9db 1278 " emulation is not supported\n");
de103c93 1279 return TCM_INVALID_CDB_FIELD;
c66ac9db 1280 }
9c31820b 1281
c66ac9db
NB		 1282 return 0;
1283}
1284
de103c93
CH		 1285sense_reason_t
1286target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1287{
0fd97ccf 1288 struct se_device *dev = cmd->se_dev;
de103c93 1289 sense_reason_t ret;
c66ac9db 1290
c66ac9db
NB		 1291 /*
1292 * Ensure that the received CDB is less than the max (252 + 8) bytes
1293 * for VARIABLE_LENGTH_CMD
1294 */
1295 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1296 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1297 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1298 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1299 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1300 }
1301 /*
1302 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1303 * allocate the additional extended CDB buffer now.. Otherwise
1304 * setup the pointer from __t_task_cdb to t_task_cdb.
1305 */
a1d8b49a
AG		 1306 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1307 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1308 GFP_KERNEL);
6708bb27
AG		 1309 if (!cmd->t_task_cdb) {
1310 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1311 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1312 scsi_command_size(cdb),
a1d8b49a 1313 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1314 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1315 }
1316 } else
a1d8b49a 1317 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1318 /*
a1d8b49a 1319 * Copy the original CDB into cmd->
c66ac9db 1320 */
a1d8b49a 1321 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1322
e5c0d6ad
RD		 1323 trace_target_sequencer_start(cmd);
1324
0fd97ccf 1325 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1326 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1327 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1328 cmd->se_tfo->get_fabric_name(),
1329 cmd->se_sess->se_node_acl->initiatorname,
1330 cmd->t_task_cdb[0]);
de103c93
CH		 1331 if (ret)
1332 return ret;
1333
1334 ret = transport_check_alloc_task_attr(cmd);
1335 if (ret)
c66ac9db 1336 return ret;
cb4f4d3c 1337
cb4f4d3c 1338 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1339 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1340 return 0;
1341}
a12f41f8 1342EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1343
695434e1
NB		 1344/*
1345 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1346 * May only be used from process context.
695434e1
NB		 1347 */
1348int transport_handle_cdb_direct(
1349 struct se_cmd *cmd)
1350{
de103c93 1351 sense_reason_t ret;
dd8ae59d 1352
695434e1
NB		 1353 if (!cmd->se_lun) {
1354 dump_stack();
6708bb27 1355 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1356 return -EINVAL;
1357 }
1358 if (in_interrupt()) {
1359 dump_stack();
6708bb27 1360 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1361 " from interrupt context\n");
1362 return -EINVAL;
1363 }
dd8ae59d 1364 /*
af877292
CH		 1365 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1366 * outstanding descriptors are handled correctly during shutdown via
1367 * transport_wait_for_tasks()
dd8ae59d
NB		 1368 *
1369 * Also, we don't take cmd->t_state_lock here as we only expect
1370 * this to be called for initial descriptor submission.
1371 */
1372 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1373 cmd->transport_state |= CMD_T_ACTIVE;
1374
dd8ae59d
NB		 1375 /*
1376 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1377 * so follow TRANSPORT_NEW_CMD processing thread context usage
1378 * and call transport_generic_request_failure() if necessary..
1379 */
1380 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1381 if (ret)
1382 transport_generic_request_failure(cmd, ret);
dd8ae59d 1383 return 0;
695434e1
NB		 1384}
1385EXPORT_SYMBOL(transport_handle_cdb_direct);
1386
c5ff8d6b 1387sense_reason_t
de103c93
CH		 1388transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1389 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1390{
1391 if (!sgl || !sgl_count)
1392 return 0;
1393
1394 /*
1395 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1396 * scatterlists already have been set to follow what the fabric
1397 * passes for the original expected data transfer length.
1398 */
1399 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1400 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1401 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1402 return TCM_INVALID_CDB_FIELD;
1403 }
1404
1405 cmd->t_data_sg = sgl;
1406 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1407 cmd->t_bidi_data_sg = sgl_bidi;
1408 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1409
de103c93
CH		 1410 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1411 return 0;
1412}
1413
a026757f
NB		 1414/*
1415 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1416 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1417 *
1418 * @se_cmd: command descriptor to submit
1419 * @se_sess: associated se_sess for endpoint
1420 * @cdb: pointer to SCSI CDB
1421 * @sense: pointer to SCSI sense buffer
1422 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1423 * @data_length: fabric expected data transfer length
1424 * @task_addr: SAM task attribute
1425 * @data_dir: DMA data direction
1426 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1427 * @sgl: struct scatterlist memory for unidirectional mapping
1428 * @sgl_count: scatterlist count for unidirectional mapping
1429 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1430 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1431 * @sgl_prot: struct scatterlist memory protection information
1432 * @sgl_prot_count: scatterlist count for protection information
a6360785 1433 *
649ee054
BVA		 1434 * Task tags are supported if the caller has set @se_cmd->tag.
1435 *
d6dfc868
RD		 1436 * Returns non zero to signal active I/O shutdown failure. All other
1437 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1438 * but still return zero here.
1439 *
a6360785
NB		 1440 * This may only be called from process context, and also currently
1441 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1442 */
1443int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1444 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1445 u32 data_length, int task_attr, int data_dir, int flags,
1446 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1447 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1448 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1449{
1450 struct se_portal_group *se_tpg;
de103c93
CH		 1451 sense_reason_t rc;
1452 int ret;
a6360785
NB		 1453
1454 se_tpg = se_sess->se_tpg;
1455 BUG_ON(!se_tpg);
1456 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1457 BUG_ON(in_interrupt());
1458 /*
1459 * Initialize se_cmd for target operation. From this point
1460 * exceptions are handled by sending exception status via
1461 * target_core_fabric_ops->queue_status() callback
1462 */
1463 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1464 data_length, data_dir, task_attr, sense);
9095adaa
QT		 1465
1466 if (flags & TARGET_SCF_USE_CPUID)
1467 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1468 else
1469 se_cmd->cpuid = WORK_CPU_UNBOUND;
1470
b0d79946
SAS		 1471 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1472 se_cmd->unknown_data_length = 1;
a6360785
NB		 1473 /*
1474 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1475 * se_sess->sess_cmd_list. A second kref_get here is necessary
1476 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1477 * kref_put() to happen during fabric packet acknowledgement.
1478 */
afc16604 1479 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1480 if (ret)
1481 return ret;
a6360785
NB		 1482 /*
1483 * Signal bidirectional data payloads to target-core
1484 */
1485 if (flags & TARGET_SCF_BIDI_OP)
1486 se_cmd->se_cmd_flags |= SCF_BIDI;
1487 /*
1488 * Locate se_lun pointer and attach it to struct se_cmd
1489 */
de103c93
CH		 1490 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1491 if (rc) {
1492 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1493 target_put_sess_cmd(se_cmd);
d6dfc868 1494 return 0;
735703ca 1495 }
b5b8e298
SG		 1496
1497 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1498 if (rc != 0) {
1499 transport_generic_request_failure(se_cmd, rc);
1500 return 0;
1501 }
1502
def2b339
NB		 1503 /*
1504 * Save pointers for SGLs containing protection information,
1505 * if present.
1506 */
1507 if (sgl_prot_count) {
1508 se_cmd->t_prot_sg = sgl_prot;
1509 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1510 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1511 }
d6e0175c 1512
a026757f
NB		 1513 /*
1514 * When a non zero sgl_count has been passed perform SGL passthrough
1515 * mapping for pre-allocated fabric memory instead of having target
1516 * core perform an internal SGL allocation..
1517 */
1518 if (sgl_count != 0) {
1519 BUG_ON(!sgl);
1520
944981c7
NB		 1521 /*
1522 * A work-around for tcm_loop as some userspace code via
1523 * scsi-generic do not memset their associated read buffers,
1524 * so go ahead and do that here for type non-data CDBs. Also
1525 * note that this is currently guaranteed to be a single SGL
1526 * for this case by target core in target_setup_cmd_from_cdb()
1527 * -> transport_generic_cmd_sequencer().
1528 */
1529 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1530 se_cmd->data_direction == DMA_FROM_DEVICE) {
1531 unsigned char *buf = NULL;
1532
1533 if (sgl)
1534 buf = kmap(sg_page(sgl)) + sgl->offset;
1535
1536 if (buf) {
1537 memset(buf, 0, sgl->length);
1538 kunmap(sg_page(sgl));
1539 }
1540 }
1541
a026757f
NB		 1542 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1543 sgl_bidi, sgl_bidi_count);
1544 if (rc != 0) {
de103c93 1545 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1546 return 0;
1547 }
1548 }
def2b339 1549
11e319ed
AG		 1550 /*
1551 * Check if we need to delay processing because of ALUA
1552 * Active/NonOptimized primary access state..
1553 */
1554 core_alua_check_nonop_delay(se_cmd);
1555
a6360785 1556 transport_handle_cdb_direct(se_cmd);
d6dfc868 1557 return 0;
a6360785 1558}
a026757f
NB		 1559EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1560
1561/*
1562 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1563 *
1564 * @se_cmd: command descriptor to submit
1565 * @se_sess: associated se_sess for endpoint
1566 * @cdb: pointer to SCSI CDB
1567 * @sense: pointer to SCSI sense buffer
1568 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1569 * @data_length: fabric expected data transfer length
1570 * @task_addr: SAM task attribute
1571 * @data_dir: DMA data direction
1572 * @flags: flags for command submission from target_sc_flags_tables
1573 *
649ee054
BVA		 1574 * Task tags are supported if the caller has set @se_cmd->tag.
1575 *
a026757f
NB		 1576 * Returns non zero to signal active I/O shutdown failure. All other
1577 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1578 * but still return zero here.
1579 *
1580 * This may only be called from process context, and also currently
1581 * assumes internal allocation of fabric payload buffer by target-core.
1582 *
1583 * It also assumes interal target core SGL memory allocation.
1584 */
1585int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1586 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1587 u32 data_length, int task_attr, int data_dir, int flags)
1588{
1589 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1590 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1591 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1592}
a6360785
NB		 1593EXPORT_SYMBOL(target_submit_cmd);
1594
9f0d05c2
NB		 1595static void target_complete_tmr_failure(struct work_struct *work)
1596{
1597 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1598
1599 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1600 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1601
1602 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1603}
1604
ea98d7f9
AG		 1605/**
1606 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1607 * for TMR CDBs
1608 *
1609 * @se_cmd: command descriptor to submit
1610 * @se_sess: associated se_sess for endpoint
1611 * @sense: pointer to SCSI sense buffer
1612 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1613 * @fabric_context: fabric context for TMR req
1614 * @tm_type: Type of TM request
c0974f89
NB		 1615 * @gfp: gfp type for caller
1616 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1617 * @flags: submit cmd flags
ea98d7f9
AG		 1618 *
1619 * Callable from all contexts.
1620 **/
1621
c7042cae 1622int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1623 unsigned char *sense, u64 unpacked_lun,
c0974f89 1624 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1625 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1626{
1627 struct se_portal_group *se_tpg;
1628 int ret;
1629
1630 se_tpg = se_sess->se_tpg;
1631 BUG_ON(!se_tpg);
1632
1633 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1634 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1635 /*
1636 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1637 * allocation failure.
1638 */
c0974f89 1639 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1640 if (ret < 0)
1641 return -ENOMEM;
ea98d7f9 1642
c0974f89
NB		 1643 if (tm_type == TMR_ABORT_TASK)
1644 se_cmd->se_tmr_req->ref_task_tag = tag;
1645
ea98d7f9 1646 /* See target_submit_cmd for commentary */
afc16604 1647 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1648 if (ret) {
1649 core_tmr_release_req(se_cmd->se_tmr_req);
1650 return ret;
1651 }
ea98d7f9 1652
ea98d7f9
AG		 1653 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1654 if (ret) {
9f0d05c2
NB		 1655 /*
1656 * For callback during failure handling, push this work off
1657 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1658 */
1659 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1660 schedule_work(&se_cmd->work);
c7042cae 1661 return 0;
ea98d7f9
AG		 1662 }
1663 transport_generic_handle_tmr(se_cmd);
c7042cae 1664 return 0;
ea98d7f9
AG		 1665}
1666EXPORT_SYMBOL(target_submit_tmr);
1667
c66ac9db
NB		 1668/*
1669 * Handle SAM-esque emulation for generic transport request failures.
1670 */
de103c93
CH		 1671void transport_generic_request_failure(struct se_cmd *cmd,
1672 sense_reason_t sense_reason)
c66ac9db 1673{
057085e5 1674 int ret = 0, post_ret = 0;
07bde79a 1675
649ee054
BVA		 1676 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1677 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1678 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1679 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1680 cmd->t_state, sense_reason);
d43d6aea 1681 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1682 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1683 (cmd->transport_state & CMD_T_STOP) != 0,
1684 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1685
c66ac9db
NB		 1686 /*
1687 * For SAM Task Attribute emulation for failed struct se_cmd
1688 */
019c4ca6 1689 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1690 /*
1691 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1692 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1693 */
1694 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1695 cmd->transport_complete_callback)
057085e5 1696 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1697
de103c93 1698 switch (sense_reason) {
03e98c9e
NB		 1699 case TCM_NON_EXISTENT_LUN:
1700 case TCM_UNSUPPORTED_SCSI_OPCODE:
1701 case TCM_INVALID_CDB_FIELD:
1702 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1703 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1704 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1705 case TCM_UNKNOWN_MODE_PAGE:
1706 case TCM_WRITE_PROTECTED:
e2397c70 1707 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1708 case TCM_CHECK_CONDITION_ABORT_CMD:
1709 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1710 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1711 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1712 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1713 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
449a1378 1714 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
e8642120
DD		 1715 case TCM_TOO_MANY_TARGET_DESCS:
1716 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE:
1717 case TCM_TOO_MANY_SEGMENT_DESCS:
1718 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE:
c66ac9db 1719 break;
de103c93
CH		 1720 case TCM_OUT_OF_RESOURCES:
1721 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1722 break;
03e98c9e 1723 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1724 /*
1725 * No SENSE Data payload for this case, set SCSI Status
1726 * and queue the response to $FABRIC_MOD.
1727 *
1728 * Uses linux/include/scsi/scsi.h SAM status codes defs
1729 */
1730 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1731 /*
1732 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1733 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1734 * CONFLICT STATUS.
1735 *
1736 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1737 */
e3d6f909 1738 if (cmd->se_sess &&
c51c8e7b
HR		 1739 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1740 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1741 cmd->orig_fe_lun, 0x2C,
1742 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1743 }
e5c0d6ad 1744 trace_target_cmd_complete(cmd);
c51c8e7b 1745 ret = cmd->se_tfo->queue_status(cmd);
cef0c280 1746 if (ret)
07bde79a 1747 goto queue_full;
c66ac9db 1748 goto check_stop;
c66ac9db 1749 default:
6708bb27 1750 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1751 cmd->t_task_cdb[0], sense_reason);
1752 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1753 break;
1754 }
f3146437 1755
de103c93 1756 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
cef0c280 1757 if (ret)
03e98c9e 1758 goto queue_full;
07bde79a 1759
c66ac9db
NB		 1760check_stop:
1761 transport_lun_remove_cmd(cmd);
06b967e4 1762 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1763 return;
1764
1765queue_full:
cef0c280 1766 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db 1767}
2fbff127 1768EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1769
dff0ca9e 1770void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
c66ac9db 1771{
de103c93 1772 sense_reason_t ret;
5f41a31d 1773
dff0ca9e
NB		 1774 if (!cmd->execute_cmd) {
1775 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1776 goto err;
1777 }
1778 if (do_checks) {
1779 /*
1780 * Check for an existing UNIT ATTENTION condition after
1781 * target_handle_task_attr() has done SAM task attr
1782 * checking, and possibly have already defered execution
1783 * out to target_restart_delayed_cmds() context.
1784 */
1785 ret = target_scsi3_ua_check(cmd);
1786 if (ret)
1787 goto err;
1788
1789 ret = target_alua_state_check(cmd);
1790 if (ret)
1791 goto err;
5f41a31d 1792
dff0ca9e
NB		 1793 ret = target_check_reservation(cmd);
1794 if (ret) {
1795 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1796 goto err;
de103c93 1797 }
5f41a31d 1798 }
dff0ca9e
NB		 1799
1800 ret = cmd->execute_cmd(cmd);
1801 if (!ret)
1802 return;
1803err:
1804 spin_lock_irq(&cmd->t_state_lock);
1805 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1806 spin_unlock_irq(&cmd->t_state_lock);
1807
1808 transport_generic_request_failure(cmd, ret);
5f41a31d
CH		 1809}
1810
aa58b531
NB		 1811static int target_write_prot_action(struct se_cmd *cmd)
1812{
5132d1e6 1813 u32 sectors;
aa58b531
NB		 1814 /*
1815 * Perform WRITE_INSERT of PI using software emulation when backend
1816 * device has PI enabled, if the transport has not already generated
1817 * PI using hardware WRITE_INSERT offload.
1818 */
1819 switch (cmd->prot_op) {
1820 case TARGET_PROT_DOUT_INSERT:
1821 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1822 sbc_dif_generate(cmd);
1823 break;
5132d1e6
NB		 1824 case TARGET_PROT_DOUT_STRIP:
1825 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1826 break;
1827
1828 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1829 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1830 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1831 if (unlikely(cmd->pi_err)) {
1832 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1833 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1834 spin_unlock_irq(&cmd->t_state_lock);
1835 transport_generic_request_failure(cmd, cmd->pi_err);
1836 return -1;
1837 }
1838 break;
aa58b531
NB		 1839 default:
1840 break;
1841 }
1842
1843 return 0;
1844}
1845
019c4ca6 1846static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1847{
1848 struct se_device *dev = cmd->se_dev;
1849
a3541703 1850 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1851 return false;
5f41a31d 1852
410c29df
NB		 1853 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1854
c66ac9db 1855 /*
25985edc 1856 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1857 * to allow the passed struct se_cmd list of tasks to the front of the list.
1858 */
5f41a31d 1859 switch (cmd->sam_task_attr) {
68d81f40 1860 case TCM_HEAD_TAG:
9c31820b
RD		 1861 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1862 cmd->t_task_cdb[0]);
019c4ca6 1863 return false;
68d81f40 1864 case TCM_ORDERED_TAG:
33940d09 1865 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1866
9c31820b
RD		 1867 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1868 cmd->t_task_cdb[0]);
5f41a31d 1869
c66ac9db 1870 /*
5f41a31d
CH		 1871 * Execute an ORDERED command if no other older commands
1872 * exist that need to be completed first.
c66ac9db 1873 */
5f41a31d 1874 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1875 return false;
5f41a31d
CH		 1876 break;
1877 default:
c66ac9db
NB		 1878 /*
1879 * For SIMPLE and UNTAGGED Task Attribute commands
1880 */
33940d09 1881 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1882 break;
c66ac9db 1883 }
5f41a31d 1884
019c4ca6
CH		 1885 if (atomic_read(&dev->dev_ordered_sync) == 0)
1886 return false;
c66ac9db 1887
019c4ca6
CH		 1888 spin_lock(&dev->delayed_cmd_lock);
1889 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1890 spin_unlock(&dev->delayed_cmd_lock);
1891
9c31820b
RD		 1892 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1893 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1894 return true;
1895}
1896
310d3d31
NB		 1897static int __transport_check_aborted_status(struct se_cmd *, int);
1898
019c4ca6
CH		 1899void target_execute_cmd(struct se_cmd *cmd)
1900{
019c4ca6
CH		 1901 /*
1902 * Determine if frontend context caller is requesting the stopping of
1903 * this command for frontend exceptions.
310d3d31
NB		 1904 *
1905 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1906 */
4a9a6c8d 1907 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1908 if (__transport_check_aborted_status(cmd, 1)) {
1909 spin_unlock_irq(&cmd->t_state_lock);
1910 return;
1911 }
019c4ca6 1912 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1913 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1914 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1915
1916 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1917 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1918 return;
1919 }
1920
1921 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1922 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1923 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1924
1925 if (target_write_prot_action(cmd))
1926 return;
019c4ca6 1927
1a398b97
NB		 1928 if (target_handle_task_attr(cmd)) {
1929 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1930 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1931 spin_unlock_irq(&cmd->t_state_lock);
1932 return;
1933 }
1934
dff0ca9e 1935 __target_execute_cmd(cmd, true);
c66ac9db 1936}
70baf0ab 1937EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1938
5f41a31d
CH		 1939/*
1940 * Process all commands up to the last received ORDERED task attribute which
1941 * requires another blocking boundary
1942 */
1943static void target_restart_delayed_cmds(struct se_device *dev)
1944{
1945 for (;;) {
1946 struct se_cmd *cmd;
1947
1948 spin_lock(&dev->delayed_cmd_lock);
1949 if (list_empty(&dev->delayed_cmd_list)) {
1950 spin_unlock(&dev->delayed_cmd_lock);
1951 break;
1952 }
1953
1954 cmd = list_entry(dev->delayed_cmd_list.next,
1955 struct se_cmd, se_delayed_node);
1956 list_del(&cmd->se_delayed_node);
1957 spin_unlock(&dev->delayed_cmd_lock);
1958
dff0ca9e 1959 __target_execute_cmd(cmd, true);
5f41a31d 1960
68d81f40 1961 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1962 break;
1963 }
1964}
1965
c66ac9db 1966/*
35e0e757 1967 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1968 * and ordered cmds need to have their tasks added to the execution queue.
1969 */
1970static void transport_complete_task_attr(struct se_cmd *cmd)
1971{
5951146d 1972 struct se_device *dev = cmd->se_dev;
c66ac9db 1973
a3541703 1974 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1975 return;
1976
410c29df
NB		 1977 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
1978 goto restart;
1979
68d81f40 1980 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1981 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1982 dev->dev_cur_ordered_id++;
9c31820b
RD		 1983 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1984 dev->dev_cur_ordered_id);
68d81f40 1985 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1986 dev->dev_cur_ordered_id++;
9c31820b
RD		 1987 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1988 dev->dev_cur_ordered_id);
68d81f40 1989 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1990 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1991
1992 dev->dev_cur_ordered_id++;
9c31820b
RD		 1993 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1994 dev->dev_cur_ordered_id);
c66ac9db 1995 }
410c29df 1996restart:
5f41a31d 1997 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1998}
1999
e057f533 2000static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 2001{
2002 int ret = 0;
2003
019c4ca6 2004 transport_complete_task_attr(cmd);
cef0c280
NB		 2005 /*
2006 * If a fabric driver ->write_pending() or ->queue_data_in() callback
2007 * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and
2008 * the same callbacks should not be retried. Return CHECK_CONDITION
2009 * if a scsi_status is not already set.
2010 *
2011 * If a fabric driver ->queue_status() has returned non zero, always
2012 * keep retrying no matter what..
2013 */
2014 if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) {
2015 if (cmd->scsi_status)
2016 goto queue_status;
e057f533 2017
cef0c280
NB		 2018 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2019 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2020 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2021 translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
2022 goto queue_status;
e057f533 2023 }
07bde79a 2024
cef0c280
NB		 2025 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
2026 goto queue_status;
2027
07bde79a
NB		 2028 switch (cmd->data_direction) {
2029 case DMA_FROM_DEVICE:
4347ab5a
NB		 2030 if (cmd->scsi_status)
2031 goto queue_status;
2032
e5c0d6ad 2033 trace_target_cmd_complete(cmd);
07bde79a
NB		 2034 ret = cmd->se_tfo->queue_data_in(cmd);
2035 break;
2036 case DMA_TO_DEVICE:
64577407 2037 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 2038 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 2039 break;
07bde79a
NB		 2040 }
2041 /* Fall through for DMA_TO_DEVICE */
2042 case DMA_NONE:
4347ab5a 2043queue_status:
e5c0d6ad 2044 trace_target_cmd_complete(cmd);
07bde79a
NB		 2045 ret = cmd->se_tfo->queue_status(cmd);
2046 break;
2047 default:
2048 break;
2049 }
2050
e057f533 2051 if (ret < 0) {
cef0c280 2052 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
e057f533
CH		 2053 return;
2054 }
2055 transport_lun_remove_cmd(cmd);
2056 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2057}
2058
cef0c280
NB		 2059static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev,
2060 int err, bool write_pending)
07bde79a 2061{
cef0c280
NB		 2062 /*
2063 * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or
2064 * ->queue_data_in() callbacks from new process context.
2065 *
2066 * Otherwise for other errors, transport_complete_qf() will send
2067 * CHECK_CONDITION via ->queue_status() instead of attempting to
2068 * retry associated fabric driver data-transfer callbacks.
2069 */
2070 if (err == -EAGAIN || err == -ENOMEM) {
2071 cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP :
2072 TRANSPORT_COMPLETE_QF_OK;
2073 } else {
2074 pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err);
2075 cmd->t_state = TRANSPORT_COMPLETE_QF_ERR;
2076 }
2077
07bde79a 2078 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2079 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2080 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2081 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2082
2083 schedule_work(&cmd->se_dev->qf_work_queue);
2084}
2085
fdeab852 2086static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2087{
fdeab852
NB		 2088 switch (cmd->prot_op) {
2089 case TARGET_PROT_DIN_STRIP:
2090 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2091 u32 sectors = cmd->data_length >>
2092 ilog2(cmd->se_dev->dev_attrib.block_size);
2093
2094 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2095 sectors, 0, cmd->t_prot_sg,
2096 0);
2097 if (cmd->pi_err)
fdeab852 2098 return true;
bc005869 2099 }
fdeab852 2100 break;
72c03850
NB		 2101 case TARGET_PROT_DIN_INSERT:
2102 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2103 break;
2104
2105 sbc_dif_generate(cmd);
2106 break;
fdeab852
NB		 2107 default:
2108 break;
bc005869
NB		 2109 }
2110
2111 return false;
2112}
2113
35e0e757 2114static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2115{
35e0e757 2116 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2117 int ret;
35e0e757 2118
c66ac9db
NB		 2119 /*
2120 * Check if we need to move delayed/dormant tasks from cmds on the
2121 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2122 * Attribute.
2123 */
019c4ca6
CH		 2124 transport_complete_task_attr(cmd);
2125
07bde79a
NB		 2126 /*
2127 * Check to schedule QUEUE_FULL work, or execute an existing
2128 * cmd->transport_qf_callback()
2129 */
2130 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2131 schedule_work(&cmd->se_dev->qf_work_queue);
2132
c66ac9db 2133 /*
d5829eac 2134 * Check if we need to send a sense buffer from
c66ac9db
NB		 2135 * the struct se_cmd in question.
2136 */
2137 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2138 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2139 ret = transport_send_check_condition_and_sense(
2140 cmd, 0, 1);
cef0c280 2141 if (ret)
27a27099
PB		 2142 goto queue_full;
2143
2144 transport_lun_remove_cmd(cmd);
2145 transport_cmd_check_stop_to_fabric(cmd);
2146 return;
c66ac9db
NB		 2147 }
2148 /*
25985edc 2149 * Check for a callback, used by amongst other things
a6b0133c 2150 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2151 */
a6b0133c
NB		 2152 if (cmd->transport_complete_callback) {
2153 sense_reason_t rc;
057085e5
NB		 2154 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2155 bool zero_dl = !(cmd->data_length);
2156 int post_ret = 0;
a6b0133c 2157
057085e5
NB		 2158 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2159 if (!rc && !post_ret) {
2160 if (caw && zero_dl)
c8e63985
NB		 2161 goto queue_rsp;
2162
a6b0133c 2163 return;
a2890087
NB		 2164 } else if (rc) {
2165 ret = transport_send_check_condition_and_sense(cmd,
2166 rc, 0);
cef0c280 2167 if (ret)
a2890087 2168 goto queue_full;
a6b0133c 2169
a2890087
NB		 2170 transport_lun_remove_cmd(cmd);
2171 transport_cmd_check_stop_to_fabric(cmd);
2172 return;
2173 }
a6b0133c 2174 }
c66ac9db 2175
c8e63985 2176queue_rsp:
c66ac9db
NB		 2177 switch (cmd->data_direction) {
2178 case DMA_FROM_DEVICE:
4347ab5a
NB		 2179 if (cmd->scsi_status)
2180 goto queue_status;
2181
4cc987ea
NB		 2182 atomic_long_add(cmd->data_length,
2183 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2184 /*
2185 * Perform READ_STRIP of PI using software emulation when
2186 * backend had PI enabled, if the transport will not be
2187 * performing hardware READ_STRIP offload.
2188 */
fdeab852 2189 if (target_read_prot_action(cmd)) {
bc005869
NB		 2190 ret = transport_send_check_condition_and_sense(cmd,
2191 cmd->pi_err, 0);
cef0c280 2192 if (ret)
bc005869
NB		 2193 goto queue_full;
2194
2195 transport_lun_remove_cmd(cmd);
2196 transport_cmd_check_stop_to_fabric(cmd);
2197 return;
2198 }
c66ac9db 2199
e5c0d6ad 2200 trace_target_cmd_complete(cmd);
07bde79a 2201 ret = cmd->se_tfo->queue_data_in(cmd);
cef0c280 2202 if (ret)
07bde79a 2203 goto queue_full;
c66ac9db
NB		 2204 break;
2205 case DMA_TO_DEVICE:
4cc987ea
NB		 2206 atomic_long_add(cmd->data_length,
2207 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2208 /*
2209 * Check if we need to send READ payload for BIDI-COMMAND
2210 */
64577407 2211 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2212 atomic_long_add(cmd->data_length,
2213 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2214 ret = cmd->se_tfo->queue_data_in(cmd);
cef0c280 2215 if (ret)
07bde79a 2216 goto queue_full;
c66ac9db
NB		 2217 break;
2218 }
2219 /* Fall through for DMA_TO_DEVICE */
2220 case DMA_NONE:
4347ab5a 2221queue_status:
e5c0d6ad 2222 trace_target_cmd_complete(cmd);
07bde79a 2223 ret = cmd->se_tfo->queue_status(cmd);
cef0c280 2224 if (ret)
07bde79a 2225 goto queue_full;
c66ac9db
NB		 2226 break;
2227 default:
2228 break;
2229 }
2230
2231 transport_lun_remove_cmd(cmd);
2232 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2233 return;
2234
2235queue_full:
6708bb27 2236 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2237 " data_direction: %d\n", cmd, cmd->data_direction);
cef0c280
NB		 2238
2239 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 2240}
2241
e64aa657 2242void target_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2243{
ec98f782 2244 struct scatterlist *sg;
ec98f782 2245 int count;
c66ac9db 2246
6708bb27
AG		 2247 for_each_sg(sgl, sg, nents, count)
2248 __free_page(sg_page(sg));
c66ac9db 2249
6708bb27
AG		 2250 kfree(sgl);
2251}
e64aa657 2252EXPORT_SYMBOL(target_free_sgl);
c66ac9db 2253
47e459e6
NB		 2254static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2255{
2256 /*
2257 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2258 * emulation, and free + reset pointers if necessary..
2259 */
2260 if (!cmd->t_data_sg_orig)
2261 return;
2262
2263 kfree(cmd->t_data_sg);
2264 cmd->t_data_sg = cmd->t_data_sg_orig;
2265 cmd->t_data_sg_orig = NULL;
2266 cmd->t_data_nents = cmd->t_data_nents_orig;
2267 cmd->t_data_nents_orig = 0;
2268}
2269
6708bb27
AG		 2270static inline void transport_free_pages(struct se_cmd *cmd)
2271{
5835812f 2272 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
e64aa657 2273 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
5835812f
AM		 2274 cmd->t_prot_sg = NULL;
2275 cmd->t_prot_nents = 0;
2276 }
2277
47e459e6 2278 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2279 /*
2280 * Release special case READ buffer payload required for
2281 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2282 */
2283 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
e64aa657 2284 target_free_sgl(cmd->t_bidi_data_sg,
c8e63985
NB		 2285 cmd->t_bidi_data_nents);
2286 cmd->t_bidi_data_sg = NULL;
2287 cmd->t_bidi_data_nents = 0;
2288 }
47e459e6 2289 transport_reset_sgl_orig(cmd);
6708bb27 2290 return;
47e459e6
NB		 2291 }
2292 transport_reset_sgl_orig(cmd);
6708bb27 2293
e64aa657 2294 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2295 cmd->t_data_sg = NULL;
2296 cmd->t_data_nents = 0;
c66ac9db 2297
e64aa657 2298 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2299 cmd->t_bidi_data_sg = NULL;
2300 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2301}
2302
e26d99ae 2303/**
febe562c
NB		 2304 * transport_put_cmd - release a reference to a command
2305 * @cmd: command to release
e26d99ae 2306 *
febe562c 2307 * This routine releases our reference to the command and frees it if possible.
e26d99ae 2308 */
febe562c 2309static int transport_put_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2310{
2311 BUG_ON(!cmd->se_tfo);
e26d99ae 2312 /*
7481deb4
NB		 2313 * If this cmd has been setup with target_get_sess_cmd(), drop
2314 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2315 */
afc16604 2316 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2317}
2318
4949314c 2319void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2320{
ec98f782 2321 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2322 struct page **pages;
2323 int i;
05d1c7c0
AG		 2324
2325 /*
ec98f782
AG		 2326 * We need to take into account a possible offset here for fabrics like
2327 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2328 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2329 */
4949314c
AG		 2330 if (!cmd->t_data_nents)
2331 return NULL;
3717ef0c
PB		 2332
2333 BUG_ON(!sg);
2334 if (cmd->t_data_nents == 1)
4949314c
AG		 2335 return kmap(sg_page(sg)) + sg->offset;
2336
2337 /* >1 page. use vmap */
2338 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2339 if (!pages)
4949314c
AG		 2340 return NULL;
2341
2342 /* convert sg[] to pages[] */
2343 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2344 pages[i] = sg_page(sg);
2345 }
2346
2347 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2348 kfree(pages);
de103c93 2349 if (!cmd->t_data_vmap)
4949314c
AG		 2350 return NULL;
2351
2352 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2353}
4949314c 2354EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2355
4949314c 2356void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2357{
a1edf9cf 2358 if (!cmd->t_data_nents) {
4949314c 2359 return;
a1edf9cf 2360 } else if (cmd->t_data_nents == 1) {
4949314c 2361 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2362 return;
2363 }
4949314c
AG		 2364
2365 vunmap(cmd->t_data_vmap);
2366 cmd->t_data_vmap = NULL;
05d1c7c0 2367}
4949314c 2368EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2369
c5ff8d6b 2370int
20093994 2371target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
e64aa657 2372 bool zero_page, bool chainable)
c66ac9db 2373{
20093994 2374 struct scatterlist *sg;
ec98f782 2375 struct page *page;
20093994 2376 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
e64aa657 2377 unsigned int nalloc, nent;
ec98f782 2378 int i = 0;
c66ac9db 2379
e64aa657
CH		 2380 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2381 if (chainable)
2382 nalloc++;
2383 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
20093994 2384 if (!sg)
ec98f782 2385 return -ENOMEM;
c66ac9db 2386
e64aa657 2387 sg_init_table(sg, nalloc);
9db9da33 2388
ec98f782
AG		 2389 while (length) {
2390 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2391 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2392 if (!page)
2393 goto out;
c66ac9db 2394
20093994 2395 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2396 length -= page_len;
2397 i++;
c66ac9db 2398 }
20093994
NB		 2399 *sgl = sg;
2400 *nents = nent;
c66ac9db 2401 return 0;
c66ac9db 2402
ec98f782 2403out:
d0e27c88 2404 while (i > 0) {
ec98f782 2405 i--;
20093994 2406 __free_page(sg_page(&sg[i]));
c66ac9db 2407 }
20093994 2408 kfree(sg);
ec98f782 2409 return -ENOMEM;
c66ac9db 2410}
e64aa657 2411EXPORT_SYMBOL(target_alloc_sgl);
c66ac9db 2412
da0f7619 2413/*
b16a35b0
AG		 2414 * Allocate any required resources to execute the command. For writes we
2415 * might not have the payload yet, so notify the fabric via a call to
2416 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2417 */
de103c93
CH		 2418sense_reason_t
2419transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2420{
c66ac9db 2421 int ret = 0;
c8e63985 2422 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2423
5835812f
AM		 2424 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2425 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2426 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
e64aa657 2427 cmd->prot_length, true, false);
5835812f
AM		 2428 if (ret < 0)
2429 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2430 }
2431
c66ac9db
NB		 2432 /*
2433 * Determine is the TCM fabric module has already allocated physical
2434 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2435 * beforehand.
c66ac9db 2436 */
ec98f782
AG		 2437 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2438 cmd->data_length) {
20093994 2439
8cefe07b
NB		 2440 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2441 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2442 u32 bidi_length;
2443
2444 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2445 bidi_length = cmd->t_task_nolb *
2446 cmd->se_dev->dev_attrib.block_size;
2447 else
2448 bidi_length = cmd->data_length;
2449
2450 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2451 &cmd->t_bidi_data_nents,
e64aa657 2452 bidi_length, zero_flag, false);
8cefe07b
NB		 2453 if (ret < 0)
2454 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2455 }
2456
20093994 2457 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
e64aa657 2458 cmd->data_length, zero_flag, false);
c66ac9db 2459 if (ret < 0)
de103c93 2460 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2461 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2462 cmd->data_length) {
2463 /*
2464 * Special case for COMPARE_AND_WRITE with fabrics
2465 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2466 */
2467 u32 caw_length = cmd->t_task_nolb *
2468 cmd->se_dev->dev_attrib.block_size;
2469
2470 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2471 &cmd->t_bidi_data_nents,
e64aa657 2472 caw_length, zero_flag, false);
c8e63985
NB		 2473 if (ret < 0)
2474 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2475 }
c66ac9db 2476 /*
c3196f0c
CH		 2477 * If this command is not a write we can execute it right here,
2478 * for write buffers we need to notify the fabric driver first
2479 * and let it call back once the write buffers are ready.
c66ac9db 2480 */
5f41a31d 2481 target_add_to_state_list(cmd);
885e7b0e 2482 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2483 target_execute_cmd(cmd);
2484 return 0;
2485 }
862e6389 2486 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2487
2488 ret = cmd->se_tfo->write_pending(cmd);
cef0c280 2489 if (ret)
c3196f0c
CH		 2490 goto queue_full;
2491
cef0c280 2492 return 0;
da0f7619 2493
c3196f0c
CH		 2494queue_full:
2495 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
cef0c280 2496 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
c3196f0c 2497 return 0;
c66ac9db 2498}
a1d8b49a 2499EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2500
e057f533 2501static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2502{
f147abb4
NB		 2503 int ret;
2504
2505 ret = cmd->se_tfo->write_pending(cmd);
cef0c280 2506 if (ret) {
e057f533
CH		 2507 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2508 cmd);
cef0c280 2509 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
e057f533 2510 }
07bde79a
NB		 2511}
2512
0f4a9431
NB		 2513static bool
2514__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2515 unsigned long *flags);
2516
2517static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2518{
2519 unsigned long flags;
2520
2521 spin_lock_irqsave(&cmd->t_state_lock, flags);
2522 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2523 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2524}
2525
d5ddad41 2526int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2527{
d5ddad41 2528 int ret = 0;
0f4a9431 2529 bool aborted = false, tas = false;
d5ddad41 2530
d14921d6 2531 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2532 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2533 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2534
0f4a9431
NB		 2535 if (!aborted || tas)
2536 ret = transport_put_cmd(cmd);
d14921d6
NB		 2537 } else {
2538 if (wait_for_tasks)
0f4a9431 2539 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2540 /*
2541 * Handle WRITE failure case where transport_generic_new_cmd()
2542 * has already added se_cmd to state_list, but fabric has
2543 * failed command before I/O submission.
2544 */
febe562c 2545 if (cmd->state_active)
c130480b 2546 target_remove_from_state_list(cmd);
d14921d6 2547
82f1c8a4 2548 if (cmd->se_lun)
c66ac9db 2549 transport_lun_remove_cmd(cmd);
c66ac9db 2550
0f4a9431
NB		 2551 if (!aborted || tas)
2552 ret = transport_put_cmd(cmd);
2553 }
2554 /*
2555 * If the task has been internally aborted due to TMR ABORT_TASK
2556 * or LUN_RESET, target_core_tmr.c is responsible for performing
2557 * the remaining calls to target_put_sess_cmd(), and not the
2558 * callers of this function.
2559 */
2560 if (aborted) {
2561 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2562 wait_for_completion(&cmd->cmd_wait_comp);
2563 cmd->se_tfo->release_cmd(cmd);
2564 ret = 1;
c66ac9db 2565 }
d5ddad41 2566 return ret;
c66ac9db
NB		 2567}
2568EXPORT_SYMBOL(transport_generic_free_cmd);
2569
a17f091d 2570/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2571 * @se_cmd: command descriptor to add
a6360785 2572 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2573 */
afc16604 2574int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2575{
afc16604 2576 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2577 unsigned long flags;
bc187ea6 2578 int ret = 0;
a17f091d 2579
a6360785
NB		 2580 /*
2581 * Add a second kref if the fabric caller is expecting to handle
2582 * fabric acknowledgement that requires two target_put_sess_cmd()
2583 * invocations before se_cmd descriptor release.
2584 */
527268df 2585 if (ack_kref) {
1b4c59b7
HR		 2586 if (!kref_get_unless_zero(&se_cmd->cmd_kref))
2587 return -EINVAL;
2588
527268df
NB		 2589 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2590 }
7481deb4 2591
a17f091d 2592 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2593 if (se_sess->sess_tearing_down) {
2594 ret = -ESHUTDOWN;
2595 goto out;
2596 }
a17f091d 2597 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2598out:
a17f091d 2599 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2600
2601 if (ret && ack_kref)
afc16604 2602 target_put_sess_cmd(se_cmd);
7544e597 2603
bc187ea6 2604 return ret;
a17f091d 2605}
20361e69 2606EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2607
febe562c
NB		 2608static void target_free_cmd_mem(struct se_cmd *cmd)
2609{
2610 transport_free_pages(cmd);
2611
2612 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2613 core_tmr_release_req(cmd->se_tmr_req);
2614 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2615 kfree(cmd->t_task_cdb);
2616}
2617
7481deb4 2618static void target_release_cmd_kref(struct kref *kref)
a17f091d 2619{
7481deb4
NB		 2620 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2621 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2622 unsigned long flags;
0f4a9431 2623 bool fabric_stop;
a17f091d 2624
9ff9d15e 2625 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
0f4a9431
NB		 2626
2627 spin_lock(&se_cmd->t_state_lock);
064cdd2d
NB		 2628 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2629 (se_cmd->transport_state & CMD_T_ABORTED);
0f4a9431
NB		 2630 spin_unlock(&se_cmd->t_state_lock);
2631
2632 if (se_cmd->cmd_wait_set || fabric_stop) {
2633 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2634 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
febe562c 2635 target_free_cmd_mem(se_cmd);
a17f091d 2636 complete(&se_cmd->cmd_wait_comp);
7481deb4 2637 return;
a17f091d 2638 }
0f4a9431 2639 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2640 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2641
febe562c 2642 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2643 se_cmd->se_tfo->release_cmd(se_cmd);
2644}
2645
2646/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2647 * @se_cmd: command descriptor to drop
2648 */
afc16604 2649int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2650{
afc16604
BVA		 2651 struct se_session *se_sess = se_cmd->se_sess;
2652
0ed6e189 2653 if (!se_sess) {
febe562c 2654 target_free_cmd_mem(se_cmd);
0ed6e189
NB		 2655 se_cmd->se_tfo->release_cmd(se_cmd);
2656 return 1;
2657 }
9ff9d15e 2658 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2659}
2660EXPORT_SYMBOL(target_put_sess_cmd);
2661
1c7b13fe
RD		 2662/* target_sess_cmd_list_set_waiting - Flag all commands in
2663 * sess_cmd_list to complete cmd_wait_comp. Set
2664 * sess_tearing_down so no more commands are queued.
2665 * @se_sess: session to flag
a17f091d 2666 */
1c7b13fe 2667void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d 2668{
1b4c59b7 2669 struct se_cmd *se_cmd, *tmp_cmd;
a17f091d 2670 unsigned long flags;
0f4a9431 2671 int rc;
a17f091d 2672
a17f091d 2673 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2674 if (se_sess->sess_tearing_down) {
2675 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2676 return;
2677 }
1c7b13fe 2678 se_sess->sess_tearing_down = 1;
9b31a328 2679 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2680
1b4c59b7
HR		 2681 list_for_each_entry_safe(se_cmd, tmp_cmd,
2682 &se_sess->sess_wait_list, se_cmd_list) {
0f4a9431
NB		 2683 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2684 if (rc) {
2685 se_cmd->cmd_wait_set = 1;
2686 spin_lock(&se_cmd->t_state_lock);
2687 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2688 spin_unlock(&se_cmd->t_state_lock);
1b4c59b7
HR		 2689 } else
2690 list_del_init(&se_cmd->se_cmd_list);
0f4a9431 2691 }
a17f091d
NB		 2692
2693 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2694}
1c7b13fe 2695EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2696
2697/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2698 * @se_sess: session to wait for active I/O
a17f091d 2699 */
be646c2d 2700void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2701{
2702 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2703 unsigned long flags;
0f4a9431 2704 bool tas;
a17f091d
NB		 2705
2706 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2707 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2708 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2709 " %d\n", se_cmd, se_cmd->t_state,
2710 se_cmd->se_tfo->get_cmd_state(se_cmd));
2711
0f4a9431
NB		 2712 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2713 tas = (se_cmd->transport_state & CMD_T_TAS);
2714 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2715
2716 if (!target_put_sess_cmd(se_cmd)) {
2717 if (tas)
2718 target_put_sess_cmd(se_cmd);
2719 }
2720
be646c2d
JE		 2721 wait_for_completion(&se_cmd->cmd_wait_comp);
2722 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2723 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2724 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2725
2726 se_cmd->se_tfo->release_cmd(se_cmd);
2727 }
9b31a328
NB		 2728
2729 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2730 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2731 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2732
a17f091d
NB		 2733}
2734EXPORT_SYMBOL(target_wait_for_sess_cmds);
2735
16a74480
NB		 2736static void target_lun_confirm(struct percpu_ref *ref)
2737{
2738 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
2739
2740 complete(&lun->lun_ref_comp);
2741}
2742
b3eeea66 2743void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2744{
16a74480
NB		 2745 /*
2746 * Mark the percpu-ref as DEAD, switch to atomic_t mode, drop
2747 * the initial reference and schedule confirm kill to be
2748 * executed after one full RCU grace period has completed.
2749 */
2750 percpu_ref_kill_and_confirm(&lun->lun_ref, target_lun_confirm);
2751 /*
2752 * The first completion waits for percpu_ref_switch_to_atomic_rcu()
2753 * to call target_lun_confirm after lun->lun_ref has been marked
2754 * as __PERCPU_REF_DEAD on all CPUs, and switches to atomic_t
2755 * mode so that percpu_ref_tryget_live() lookup of lun->lun_ref
2756 * fails for all new incoming I/O.
2757 */
5277797d 2758 wait_for_completion(&lun->lun_ref_comp);
16a74480
NB		 2759 /*
2760 * The second completion waits for percpu_ref_put_many() to
2761 * invoke ->release() after lun->lun_ref has switched to
2762 * atomic_t mode, and lun->lun_ref.count has reached zero.
2763 *
2764 * At this point all target-core lun->lun_ref references have
2765 * been dropped via transport_lun_remove_cmd(), and it's safe
2766 * to proceed with the remaining LUN shutdown.
2767 */
2768 wait_for_completion(&lun->lun_shutdown_comp);
c66ac9db
NB		 2769}
2770
0f4a9431
NB		 2771static bool
2772__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2773 bool *aborted, bool *tas, unsigned long *flags)
2774 __releases(&cmd->t_state_lock)
2775 __acquires(&cmd->t_state_lock)
c66ac9db 2776{
c66ac9db 2777
0f4a9431
NB		 2778 assert_spin_locked(&cmd->t_state_lock);
2779 WARN_ON_ONCE(!irqs_disabled());
2780
2781 if (fabric_stop)
2782 cmd->transport_state |= CMD_T_FABRIC_STOP;
2783
2784 if (cmd->transport_state & CMD_T_ABORTED)
2785 *aborted = true;
2786
2787 if (cmd->transport_state & CMD_T_TAS)
2788 *tas = true;
2789
c8e31f26 2790 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2791 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2792 return false;
cb4f4d3c 2793
c8e31f26 2794 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2795 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2796 return false;
7d680f3b 2797
0f4a9431
NB		 2798 if (!(cmd->transport_state & CMD_T_ACTIVE))
2799 return false;
2800
2801 if (fabric_stop && *aborted)
a17f091d 2802 return false;
c66ac9db 2803
7d680f3b 2804 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2805
0f4a9431
NB		 2806 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2807 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2808 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2809
0f4a9431 2810 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2811
a1d8b49a 2812 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2813
0f4a9431 2814 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2815 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2816
0f4a9431
NB		 2817 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2818 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2819
0f4a9431
NB		 2820 return true;
2821}
2822
2823/**
2824 * transport_wait_for_tasks - wait for completion to occur
2825 * @cmd: command to wait
2826 *
2827 * Called from frontend fabric context to wait for storage engine
2828 * to pause and/or release frontend generated struct se_cmd.
2829 */
2830bool transport_wait_for_tasks(struct se_cmd *cmd)
2831{
2832 unsigned long flags;
2833 bool ret, aborted = false, tas = false;
2834
2835 spin_lock_irqsave(&cmd->t_state_lock, flags);
2836 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 2837 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2838
0f4a9431 2839 return ret;
c66ac9db 2840}
d14921d6 2841EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2842
ab78fef4
BVA		 2843struct sense_info {
2844 u8 key;
2845 u8 asc;
2846 u8 ascq;
2847 bool add_sector_info;
2848};
2849
2850static const struct sense_info sense_info_table[] = {
2851 [TCM_NO_SENSE] = {
2852 .key = NOT_READY
2853 },
2854 [TCM_NON_EXISTENT_LUN] = {
2855 .key = ILLEGAL_REQUEST,
2856 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2857 },
2858 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2859 .key = ILLEGAL_REQUEST,
2860 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2861 },
2862 [TCM_SECTOR_COUNT_TOO_MANY] = {
2863 .key = ILLEGAL_REQUEST,
2864 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2865 },
2866 [TCM_UNKNOWN_MODE_PAGE] = {
2867 .key = ILLEGAL_REQUEST,
2868 .asc = 0x24, /* INVALID FIELD IN CDB */
2869 },
2870 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2871 .key = ABORTED_COMMAND,
2872 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2873 .ascq = 0x03,
2874 },
2875 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2876 .key = ABORTED_COMMAND,
2877 .asc = 0x0c, /* WRITE ERROR */
2878 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2879 },
2880 [TCM_INVALID_CDB_FIELD] = {
2881 .key = ILLEGAL_REQUEST,
2882 .asc = 0x24, /* INVALID FIELD IN CDB */
2883 },
2884 [TCM_INVALID_PARAMETER_LIST] = {
2885 .key = ILLEGAL_REQUEST,
2886 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2887 },
e8642120
DD		 2888 [TCM_TOO_MANY_TARGET_DESCS] = {
2889 .key = ILLEGAL_REQUEST,
2890 .asc = 0x26,
2891 .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */
2892 },
2893 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = {
2894 .key = ILLEGAL_REQUEST,
2895 .asc = 0x26,
2896 .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */
2897 },
2898 [TCM_TOO_MANY_SEGMENT_DESCS] = {
2899 .key = ILLEGAL_REQUEST,
2900 .asc = 0x26,
2901 .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */
2902 },
2903 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = {
2904 .key = ILLEGAL_REQUEST,
2905 .asc = 0x26,
2906 .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */
2907 },
ab78fef4
BVA		 2908 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2909 .key = ILLEGAL_REQUEST,
2910 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2911 },
2912 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2913 .key = ILLEGAL_REQUEST,
2914 .asc = 0x0c, /* WRITE ERROR */
2915 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2916 },
2917 [TCM_SERVICE_CRC_ERROR] = {
2918 .key = ABORTED_COMMAND,
2919 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2920 .ascq = 0x05, /* N/A */
2921 },
2922 [TCM_SNACK_REJECTED] = {
2923 .key = ABORTED_COMMAND,
2924 .asc = 0x11, /* READ ERROR */
2925 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2926 },
2927 [TCM_WRITE_PROTECTED] = {
2928 .key = DATA_PROTECT,
2929 .asc = 0x27, /* WRITE PROTECTED */
2930 },
2931 [TCM_ADDRESS_OUT_OF_RANGE] = {
2932 .key = ILLEGAL_REQUEST,
2933 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2934 },
2935 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2936 .key = UNIT_ATTENTION,
2937 },
2938 [TCM_CHECK_CONDITION_NOT_READY] = {
2939 .key = NOT_READY,
2940 },
2941 [TCM_MISCOMPARE_VERIFY] = {
2942 .key = MISCOMPARE,
2943 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2944 .ascq = 0x00,
2945 },
2946 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2947 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2948 .asc = 0x10,
2949 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2950 .add_sector_info = true,
2951 },
2952 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2953 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2954 .asc = 0x10,
2955 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2956 .add_sector_info = true,
2957 },
2958 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2959 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2960 .asc = 0x10,
2961 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2962 .add_sector_info = true,
2963 },
449a1378
NB		 2964 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
2965 .key = COPY_ABORTED,
2966 .asc = 0x0d,
2967 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
2968
2969 },
ab78fef4
BVA		 2970 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2971 /*
2972 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2973 * Solaris initiators. Returning NOT READY instead means the
2974 * operations will be retried a finite number of times and we
2975 * can survive intermittent errors.
2976 */
2977 .key = NOT_READY,
2978 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2979 },
2980};
2981
f5a8b3a7 2982static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2983{
2984 const struct sense_info *si;
2985 u8 *buffer = cmd->sense_buffer;
2986 int r = (__force int)reason;
2987 u8 asc, ascq;
4e4937e8 2988 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2989
2990 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2991 si = &sense_info_table[r];
2992 else
2993 si = &sense_info_table[(__force int)
2994 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2995
ab78fef4
BVA		 2996 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2997 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2998 WARN_ON_ONCE(asc == 0);
2999 } else if (si->asc == 0) {
3000 WARN_ON_ONCE(cmd->scsi_asc == 0);
3001 asc = cmd->scsi_asc;
3002 ascq = cmd->scsi_ascq;
3003 } else {
3004 asc = si->asc;
3005 ascq = si->ascq;
3006 }
9ec1e1ce 3007
4e4937e8 3008 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 3009 if (si->add_sector_info)
f5a8b3a7
SG		 3010 return scsi_set_sense_information(buffer,
3011 cmd->scsi_sense_length,
3012 cmd->bad_sector);
3013
3014 return 0;
ab78fef4
BVA		 3015}
3016
de103c93
CH		 3017int
3018transport_send_check_condition_and_sense(struct se_cmd *cmd,
3019 sense_reason_t reason, int from_transport)
c66ac9db 3020{
c66ac9db 3021 unsigned long flags;
c66ac9db 3022
a1d8b49a 3023 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3024 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 3025 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3026 return 0;
3027 }
3028 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 3029 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3030
ab78fef4 3031 if (!from_transport) {
f5a8b3a7
SG		 3032 int rc;
3033
c66ac9db 3034 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 3035 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3036 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 3037 rc = translate_sense_reason(cmd, reason);
3038 if (rc)
3039 return rc;
c66ac9db 3040 }
c66ac9db 3041
e5c0d6ad 3042 trace_target_cmd_complete(cmd);
07bde79a 3043 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3044}
3045EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3046
310d3d31
NB		 3047static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3048 __releases(&cmd->t_state_lock)
3049 __acquires(&cmd->t_state_lock)
c66ac9db 3050{
cef0c280
NB		 3051 int ret;
3052
310d3d31
NB		 3053 assert_spin_locked(&cmd->t_state_lock);
3054 WARN_ON_ONCE(!irqs_disabled());
3055
c18bc7d8
RD		 3056 if (!(cmd->transport_state & CMD_T_ABORTED))
3057 return 0;
68259b5a
AL		 3058 /*
3059 * If cmd has been aborted but either no status is to be sent or it has
3060 * already been sent, just return
3061 */
310d3d31
NB		 3062 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
3063 if (send_status)
3064 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 3065 return 1;
310d3d31 3066 }
8b1e1244 3067
310d3d31
NB		 3068 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
3069 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3070
68259b5a 3071 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 3072 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 3073 trace_target_cmd_complete(cmd);
310d3d31
NB		 3074
3075 spin_unlock_irq(&cmd->t_state_lock);
cef0c280
NB		 3076 ret = cmd->se_tfo->queue_status(cmd);
3077 if (ret)
3078 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
310d3d31 3079 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 3080
3081 return 1;
c66ac9db 3082}
310d3d31
NB		 3083
3084int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3085{
3086 int ret;
3087
3088 spin_lock_irq(&cmd->t_state_lock);
3089 ret = __transport_check_aborted_status(cmd, send_status);
3090 spin_unlock_irq(&cmd->t_state_lock);
3091
3092 return ret;
3093}
c66ac9db
NB		 3094EXPORT_SYMBOL(transport_check_aborted_status);
3095
3096void transport_send_task_abort(struct se_cmd *cmd)
3097{
c252f003 3098 unsigned long flags;
cef0c280 3099 int ret;
c252f003
NB		 3100
3101 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 3102 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 3103 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3104 return;
3105 }
3106 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3107
c66ac9db
NB		 3108 /*
3109 * If there are still expected incoming fabric WRITEs, we wait
3110 * until until they have completed before sending a TASK_ABORTED
3111 * response. This response with TASK_ABORTED status will be
3112 * queued back to fabric module by transport_check_aborted_status().
3113 */
3114 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3115 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 3116 spin_lock_irqsave(&cmd->t_state_lock, flags);
3117 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3118 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3119 goto send_abort;
3120 }
68259b5a 3121 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 3122 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 3123 return;
c66ac9db
NB		 3124 }
3125 }
310d3d31 3126send_abort:
c66ac9db 3127 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3128
72b59d6e
RD		 3129 transport_lun_remove_cmd(cmd);
3130
649ee054
BVA		 3131 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3132 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3133
e5c0d6ad 3134 trace_target_cmd_complete(cmd);
cef0c280
NB		 3135 ret = cmd->se_tfo->queue_status(cmd);
3136 if (ret)
3137 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 3138}
3139
af877292 3140static void target_tmr_work(struct work_struct *work)
c66ac9db 3141{
af877292 3142 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3143 struct se_device *dev = cmd->se_dev;
c66ac9db 3144 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 3145 unsigned long flags;
c66ac9db
NB		 3146 int ret;
3147
a6d9bb1c
NB		 3148 spin_lock_irqsave(&cmd->t_state_lock, flags);
3149 if (cmd->transport_state & CMD_T_ABORTED) {
3150 tmr->response = TMR_FUNCTION_REJECTED;
3151 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3152 goto check_stop;
3153 }
3154 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3155
c66ac9db 3156 switch (tmr->function) {
5c6cd613 3157 case TMR_ABORT_TASK:
3d28934a 3158 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3159 break;
5c6cd613
NB		 3160 case TMR_ABORT_TASK_SET:
3161 case TMR_CLEAR_ACA:
3162 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3163 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3164 break;
5c6cd613 3165 case TMR_LUN_RESET:
c66ac9db
NB		 3166 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3167 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3168 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3169 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3170 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3171 cmd->orig_fe_lun, 0x29,
3172 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3173 }
c66ac9db 3174 break;
5c6cd613 3175 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3176 tmr->response = TMR_FUNCTION_REJECTED;
3177 break;
5c6cd613 3178 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3179 tmr->response = TMR_FUNCTION_REJECTED;
3180 break;
c66ac9db 3181 default:
6708bb27 3182 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3183 tmr->function);
3184 tmr->response = TMR_FUNCTION_REJECTED;
3185 break;
3186 }
3187
a6d9bb1c
NB		 3188 spin_lock_irqsave(&cmd->t_state_lock, flags);
3189 if (cmd->transport_state & CMD_T_ABORTED) {
3190 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3191 goto check_stop;
3192 }
a6d9bb1c
NB		 3193 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3194
e3d6f909 3195 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3196
a6d9bb1c 3197check_stop:
b7b8bef7 3198 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3199}
3200
af877292
CH		 3201int transport_generic_handle_tmr(
3202 struct se_cmd *cmd)
c66ac9db 3203{
f15e9cd9 3204 unsigned long flags;
c54eeffb 3205 bool aborted = false;
f15e9cd9
NB		 3206
3207 spin_lock_irqsave(&cmd->t_state_lock, flags);
c54eeffb
NB		 3208 if (cmd->transport_state & CMD_T_ABORTED) {
3209 aborted = true;
3210 } else {
3211 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3212 cmd->transport_state |= CMD_T_ACTIVE;
3213 }
f15e9cd9
NB		 3214 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3215
c54eeffb
NB		 3216 if (aborted) {
3217 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
3218 "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
3219 cmd->se_tmr_req->ref_task_tag, cmd->tag);
3220 transport_cmd_check_stop_to_fabric(cmd);
3221 return 0;
3222 }
3223
af877292
CH		 3224 INIT_WORK(&cmd->work, target_tmr_work);
3225 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3226 return 0;
3227}
af877292 3228EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3229
3230bool
3231target_check_wce(struct se_device *dev)
3232{
3233 bool wce = false;
3234
3235 if (dev->transport->get_write_cache)
3236 wce = dev->transport->get_write_cache(dev);
3237 else if (dev->dev_attrib.emulate_write_cache > 0)
3238 wce = true;
3239
3240 return wce;
3241}
3242
3243bool
3244target_check_fua(struct se_device *dev)
3245{
3246 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3247}
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