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Merge tag 'iio-for-4.13b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[mirror_ubuntu-artful-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
5538d294 37#include <linux/vmalloc.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
ba929992 41#include <scsi/scsi_proto.h>
9ec1e1ce 42#include <scsi/scsi_common.h>
c66ac9db
NB		 43
44#include <target/target_core_base.h>
c4795fb2
CH		 45#include <target/target_core_backend.h>
46#include <target/target_core_fabric.h>
c66ac9db 47
e26d99ae 48#include "target_core_internal.h"
c66ac9db 49#include "target_core_alua.h"
c66ac9db 50#include "target_core_pr.h"
c66ac9db
NB		 51#include "target_core_ua.h"
52
e5c0d6ad
RD		 53#define CREATE_TRACE_POINTS
54#include <trace/events/target.h>
55
35e0e757 56static struct workqueue_struct *target_completion_wq;
c66ac9db 57static struct kmem_cache *se_sess_cache;
c66ac9db 58struct kmem_cache *se_ua_cache;
c66ac9db
NB		 59struct kmem_cache *t10_pr_reg_cache;
60struct kmem_cache *t10_alua_lu_gp_cache;
61struct kmem_cache *t10_alua_lu_gp_mem_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_cache;
229d4f11
HR		 63struct kmem_cache *t10_alua_lba_map_cache;
64struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 65
c66ac9db 66static void transport_complete_task_attr(struct se_cmd *cmd);
fa7e25cf 67static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason);
07bde79a 68static void transport_handle_queue_full(struct se_cmd *cmd,
fa7e25cf 69 struct se_device *dev, int err, bool write_pending);
d5ddad41 70static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 71static void target_complete_ok_work(struct work_struct *work);
c66ac9db 72
e3d6f909 73int init_se_kmem_caches(void)
c66ac9db 74{
c66ac9db
NB		 75 se_sess_cache = kmem_cache_create("se_sess_cache",
76 sizeof(struct se_session), __alignof__(struct se_session),
77 0, NULL);
6708bb27
AG		 78 if (!se_sess_cache) {
79 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 80 " failed\n");
c8e31f26 81 goto out;
c66ac9db
NB		 82 }
83 se_ua_cache = kmem_cache_create("se_ua_cache",
84 sizeof(struct se_ua), __alignof__(struct se_ua),
85 0, NULL);
6708bb27
AG		 86 if (!se_ua_cache) {
87 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 88 goto out_free_sess_cache;
c66ac9db 89 }
c66ac9db
NB		 90 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
91 sizeof(struct t10_pr_registration),
92 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 93 if (!t10_pr_reg_cache) {
94 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 95 " failed\n");
35e0e757 96 goto out_free_ua_cache;
c66ac9db
NB		 97 }
98 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
99 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
100 0, NULL);
6708bb27
AG		 101 if (!t10_alua_lu_gp_cache) {
102 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 103 " failed\n");
35e0e757 104 goto out_free_pr_reg_cache;
c66ac9db
NB		 105 }
106 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
107 sizeof(struct t10_alua_lu_gp_member),
108 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 109 if (!t10_alua_lu_gp_mem_cache) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 111 "cache failed\n");
35e0e757 112 goto out_free_lu_gp_cache;
c66ac9db
NB		 113 }
114 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
115 sizeof(struct t10_alua_tg_pt_gp),
116 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 117 if (!t10_alua_tg_pt_gp_cache) {
118 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 119 "cache failed\n");
35e0e757 120 goto out_free_lu_gp_mem_cache;
c66ac9db 121 }
229d4f11
HR		 122 t10_alua_lba_map_cache = kmem_cache_create(
123 "t10_alua_lba_map_cache",
124 sizeof(struct t10_alua_lba_map),
125 __alignof__(struct t10_alua_lba_map), 0, NULL);
126 if (!t10_alua_lba_map_cache) {
127 pr_err("kmem_cache_create() for t10_alua_lba_map_"
128 "cache failed\n");
adf653f9 129 goto out_free_tg_pt_gp_cache;
229d4f11
HR		 130 }
131 t10_alua_lba_map_mem_cache = kmem_cache_create(
132 "t10_alua_lba_map_mem_cache",
133 sizeof(struct t10_alua_lba_map_member),
134 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
135 if (!t10_alua_lba_map_mem_cache) {
136 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
137 "cache failed\n");
138 goto out_free_lba_map_cache;
139 }
c66ac9db 140
35e0e757
CH		 141 target_completion_wq = alloc_workqueue("target_completion",
142 WQ_MEM_RECLAIM, 0);
143 if (!target_completion_wq)
229d4f11 144 goto out_free_lba_map_mem_cache;
35e0e757 145
c66ac9db 146 return 0;
35e0e757 147
229d4f11
HR		 148out_free_lba_map_mem_cache:
149 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
150out_free_lba_map_cache:
151 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 152out_free_tg_pt_gp_cache:
153 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
154out_free_lu_gp_mem_cache:
155 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
156out_free_lu_gp_cache:
157 kmem_cache_destroy(t10_alua_lu_gp_cache);
158out_free_pr_reg_cache:
159 kmem_cache_destroy(t10_pr_reg_cache);
160out_free_ua_cache:
161 kmem_cache_destroy(se_ua_cache);
162out_free_sess_cache:
163 kmem_cache_destroy(se_sess_cache);
c66ac9db 164out:
e3d6f909 165 return -ENOMEM;
c66ac9db
NB		 166}
167
e3d6f909 168void release_se_kmem_caches(void)
c66ac9db 169{
35e0e757 170 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 171 kmem_cache_destroy(se_sess_cache);
172 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 173 kmem_cache_destroy(t10_pr_reg_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_cache);
175 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
176 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
229d4f11
HR		 177 kmem_cache_destroy(t10_alua_lba_map_cache);
178 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 179}
180
e3d6f909
AG		 181/* This code ensures unique mib indexes are handed out. */
182static DEFINE_SPINLOCK(scsi_mib_index_lock);
183static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 184
185/*
186 * Allocate a new row index for the entry type specified
187 */
188u32 scsi_get_new_index(scsi_index_t type)
189{
190 u32 new_index;
191
e3d6f909 192 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 193
e3d6f909
AG		 194 spin_lock(&scsi_mib_index_lock);
195 new_index = ++scsi_mib_index[type];
196 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 197
198 return new_index;
199}
200
dbc5623e 201void transport_subsystem_check_init(void)
c66ac9db
NB		 202{
203 int ret;
283669d2 204 static int sub_api_initialized;
c66ac9db 205
dbc5623e
NB		 206 if (sub_api_initialized)
207 return;
208
c66ac9db
NB		 209 ret = request_module("target_core_iblock");
210 if (ret != 0)
6708bb27 211 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 212
213 ret = request_module("target_core_file");
214 if (ret != 0)
6708bb27 215 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 216
217 ret = request_module("target_core_pscsi");
218 if (ret != 0)
6708bb27 219 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 220
7c9e7a6f
AG		 221 ret = request_module("target_core_user");
222 if (ret != 0)
223 pr_err("Unable to load target_core_user\n");
224
e3d6f909 225 sub_api_initialized = 1;
c66ac9db
NB		 226}
227
e70beee7 228struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 229{
230 struct se_session *se_sess;
231
232 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 233 if (!se_sess) {
234 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 235 " se_sess_cache\n");
236 return ERR_PTR(-ENOMEM);
237 }
238 INIT_LIST_HEAD(&se_sess->sess_list);
239 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 240 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 241 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 242 spin_lock_init(&se_sess->sess_cmd_lock);
e70beee7 243 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 244
245 return se_sess;
246}
247EXPORT_SYMBOL(transport_init_session);
248
c0add7fd
NB		 249int transport_alloc_session_tags(struct se_session *se_sess,
250 unsigned int tag_num, unsigned int tag_size)
251{
252 int rc;
253
8c7f6e9b
NB		 254 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
255 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 256 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 257 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
258 if (!se_sess->sess_cmd_map) {
259 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
260 return -ENOMEM;
261 }
c0add7fd
NB		 262 }
263
264 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
265 if (rc < 0) {
266 pr_err("Unable to init se_sess->sess_tag_pool,"
267 " tag_num: %u\n", tag_num);
de64d3a6 268 kvfree(se_sess->sess_cmd_map);
c0add7fd
NB		 269 se_sess->sess_cmd_map = NULL;
270 return -ENOMEM;
271 }
272
273 return 0;
274}
275EXPORT_SYMBOL(transport_alloc_session_tags);
276
277struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 278 unsigned int tag_size,
279 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 280{
281 struct se_session *se_sess;
282 int rc;
283
7861728d
NB		 284 if (tag_num != 0 && !tag_size) {
285 pr_err("init_session_tags called with percpu-ida tag_num:"
286 " %u, but zero tag_size\n", tag_num);
287 return ERR_PTR(-EINVAL);
288 }
289 if (!tag_num && tag_size) {
290 pr_err("init_session_tags called with percpu-ida tag_size:"
291 " %u, but zero tag_num\n", tag_size);
292 return ERR_PTR(-EINVAL);
293 }
294
e70beee7 295 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 296 if (IS_ERR(se_sess))
297 return se_sess;
298
299 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
300 if (rc < 0) {
301 transport_free_session(se_sess);
302 return ERR_PTR(-ENOMEM);
303 }
304
305 return se_sess;
306}
307EXPORT_SYMBOL(transport_init_session_tags);
308
c66ac9db 309/*
140854cb 310 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 311 */
312void __transport_register_session(
313 struct se_portal_group *se_tpg,
314 struct se_node_acl *se_nacl,
315 struct se_session *se_sess,
316 void *fabric_sess_ptr)
317{
9ac8928e 318 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 319 unsigned char buf[PR_REG_ISID_LEN];
320
321 se_sess->se_tpg = se_tpg;
322 se_sess->fabric_sess_ptr = fabric_sess_ptr;
323 /*
324 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
325 *
326 * Only set for struct se_session's that will actually be moving I/O.
327 * eg: *NOT* discovery sessions.
328 */
329 if (se_nacl) {
bffb5128
NB		 330 /*
331 *
332 * Determine if fabric allows for T10-PI feature bits exposed to
333 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
334 *
335 * If so, then always save prot_type on a per se_node_acl node
336 * basis and re-instate the previous sess_prot_type to avoid
337 * disabling PI from below any previously initiator side
338 * registered LUNs.
339 */
340 if (se_nacl->saved_prot_type)
341 se_sess->sess_prot_type = se_nacl->saved_prot_type;
342 else if (tfo->tpg_check_prot_fabric_only)
343 se_sess->sess_prot_type = se_nacl->saved_prot_type =
344 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 345 /*
346 * If the fabric module supports an ISID based TransportID,
347 * save this value in binary from the fabric I_T Nexus now.
348 */
e3d6f909 349 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 350 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 351 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 352 &buf[0], PR_REG_ISID_LEN);
353 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
354 }
afb999ff 355
c66ac9db
NB		 356 spin_lock_irq(&se_nacl->nacl_sess_lock);
357 /*
358 * The se_nacl->nacl_sess pointer will be set to the
359 * last active I_T Nexus for each struct se_node_acl.
360 */
361 se_nacl->nacl_sess = se_sess;
362
363 list_add_tail(&se_sess->sess_acl_list,
364 &se_nacl->acl_sess_list);
365 spin_unlock_irq(&se_nacl->nacl_sess_lock);
366 }
367 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
368
6708bb27 369 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 370 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 371}
372EXPORT_SYMBOL(__transport_register_session);
373
374void transport_register_session(
375 struct se_portal_group *se_tpg,
376 struct se_node_acl *se_nacl,
377 struct se_session *se_sess,
378 void *fabric_sess_ptr)
379{
140854cb
NB		 380 unsigned long flags;
381
382 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 383 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 384 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 385}
386EXPORT_SYMBOL(transport_register_session);
387
7861728d
NB		 388struct se_session *
389target_alloc_session(struct se_portal_group *tpg,
390 unsigned int tag_num, unsigned int tag_size,
391 enum target_prot_op prot_op,
392 const char *initiatorname, void *private,
393 int (*callback)(struct se_portal_group *,
394 struct se_session *, void *))
395{
396 struct se_session *sess;
397
398 /*
399 * If the fabric driver is using percpu-ida based pre allocation
400 * of I/O descriptor tags, go ahead and perform that setup now..
401 */
402 if (tag_num != 0)
403 sess = transport_init_session_tags(tag_num, tag_size, prot_op);
404 else
405 sess = transport_init_session(prot_op);
406
407 if (IS_ERR(sess))
408 return sess;
409
410 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
411 (unsigned char *)initiatorname);
412 if (!sess->se_node_acl) {
413 transport_free_session(sess);
414 return ERR_PTR(-EACCES);
415 }
416 /*
417 * Go ahead and perform any remaining fabric setup that is
418 * required before transport_register_session().
419 */
420 if (callback != NULL) {
421 int rc = callback(tpg, sess, private);
422 if (rc) {
423 transport_free_session(sess);
424 return ERR_PTR(rc);
425 }
426 }
427
428 transport_register_session(tpg, sess->se_node_acl, sess, private);
429 return sess;
430}
431EXPORT_SYMBOL(target_alloc_session);
432
f8e471f9
NB		 433ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
434{
435 struct se_session *se_sess;
436 ssize_t len = 0;
437
438 spin_lock_bh(&se_tpg->session_lock);
439 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
440 if (!se_sess->se_node_acl)
441 continue;
442 if (!se_sess->se_node_acl->dynamic_node_acl)
443 continue;
444 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
445 break;
446
447 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
448 se_sess->se_node_acl->initiatorname);
449 len += 1; /* Include NULL terminator */
450 }
451 spin_unlock_bh(&se_tpg->session_lock);
452
453 return len;
454}
455EXPORT_SYMBOL(target_show_dynamic_sessions);
456
afb999ff
NB		 457static void target_complete_nacl(struct kref *kref)
458{
459 struct se_node_acl *nacl = container_of(kref,
460 struct se_node_acl, acl_kref);
01d4d673 461 struct se_portal_group *se_tpg = nacl->se_tpg;
afb999ff 462
01d4d673
NB		 463 if (!nacl->dynamic_stop) {
464 complete(&nacl->acl_free_comp);
465 return;
466 }
467
468 mutex_lock(&se_tpg->acl_node_mutex);
469 list_del(&nacl->acl_list);
470 mutex_unlock(&se_tpg->acl_node_mutex);
471
472 core_tpg_wait_for_nacl_pr_ref(nacl);
473 core_free_device_list_for_node(nacl, se_tpg);
474 kfree(nacl);
afb999ff
NB		 475}
476
477void target_put_nacl(struct se_node_acl *nacl)
478{
479 kref_put(&nacl->acl_kref, target_complete_nacl);
480}
21aaa23b 481EXPORT_SYMBOL(target_put_nacl);
afb999ff 482
c66ac9db
NB		 483void transport_deregister_session_configfs(struct se_session *se_sess)
484{
485 struct se_node_acl *se_nacl;
23388864 486 unsigned long flags;
c66ac9db
NB		 487 /*
488 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
489 */
490 se_nacl = se_sess->se_node_acl;
6708bb27 491 if (se_nacl) {
23388864 492 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
fba81f88
CH		 493 if (!list_empty(&se_sess->sess_acl_list))
494 list_del_init(&se_sess->sess_acl_list);
c66ac9db
NB		 495 /*
496 * If the session list is empty, then clear the pointer.
497 * Otherwise, set the struct se_session pointer from the tail
498 * element of the per struct se_node_acl active session list.
499 */
500 if (list_empty(&se_nacl->acl_sess_list))
501 se_nacl->nacl_sess = NULL;
502 else {
503 se_nacl->nacl_sess = container_of(
504 se_nacl->acl_sess_list.prev,
505 struct se_session, sess_acl_list);
506 }
23388864 507 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 508 }
509}
510EXPORT_SYMBOL(transport_deregister_session_configfs);
511
512void transport_free_session(struct se_session *se_sess)
513{
21aaa23b 514 struct se_node_acl *se_nacl = se_sess->se_node_acl;
01d4d673 515
21aaa23b
NB		 516 /*
517 * Drop the se_node_acl->nacl_kref obtained from within
518 * core_tpg_get_initiator_node_acl().
519 */
520 if (se_nacl) {
01d4d673
NB		 521 struct se_portal_group *se_tpg = se_nacl->se_tpg;
522 const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo;
523 unsigned long flags;
524
21aaa23b 525 se_sess->se_node_acl = NULL;
01d4d673
NB		 526
527 /*
528 * Also determine if we need to drop the extra ->cmd_kref if
529 * it had been previously dynamically generated, and
530 * the endpoint is not caching dynamic ACLs.
531 */
532 mutex_lock(&se_tpg->acl_node_mutex);
533 if (se_nacl->dynamic_node_acl &&
534 !se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
535 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
536 if (list_empty(&se_nacl->acl_sess_list))
537 se_nacl->dynamic_stop = true;
538 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
539
540 if (se_nacl->dynamic_stop)
541 list_del(&se_nacl->acl_list);
542 }
543 mutex_unlock(&se_tpg->acl_node_mutex);
544
545 if (se_nacl->dynamic_stop)
546 target_put_nacl(se_nacl);
547
21aaa23b
NB		 548 target_put_nacl(se_nacl);
549 }
c0add7fd
NB		 550 if (se_sess->sess_cmd_map) {
551 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 552 kvfree(se_sess->sess_cmd_map);
c0add7fd 553 }
c66ac9db
NB		 554 kmem_cache_free(se_sess_cache, se_sess);
555}
556EXPORT_SYMBOL(transport_free_session);
557
558void transport_deregister_session(struct se_session *se_sess)
559{
560 struct se_portal_group *se_tpg = se_sess->se_tpg;
e63a8e19 561 unsigned long flags;
c66ac9db 562
6708bb27 563 if (!se_tpg) {
c66ac9db
NB		 564 transport_free_session(se_sess);
565 return;
566 }
c66ac9db 567
e63a8e19 568 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 569 list_del(&se_sess->sess_list);
570 se_sess->se_tpg = NULL;
571 se_sess->fabric_sess_ptr = NULL;
e63a8e19 572 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db 573
6708bb27 574 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 575 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 576 /*
125d0119 577 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff 578 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
21aaa23b 579 * removal context from within transport_free_session() code.
01d4d673
NB		 580 *
581 * For dynamic ACL, target_put_nacl() uses target_complete_nacl()
582 * to release all remaining generate_node_acl=1 created ACL resources.
01468346 583 */
01468346 584
afb999ff 585 transport_free_session(se_sess);
c66ac9db
NB		 586}
587EXPORT_SYMBOL(transport_deregister_session);
588
cf572a96 589static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 590{
42bf829e 591 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 592 unsigned long flags;
593
42bf829e
CH		 594 if (!dev)
595 return;
c66ac9db 596
cf572a96
CH		 597 spin_lock_irqsave(&dev->execute_task_lock, flags);
598 if (cmd->state_active) {
599 list_del(&cmd->state_list);
cf572a96 600 cmd->state_active = false;
c66ac9db 601 }
cf572a96 602 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 603}
604
b1a2ecda 605static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
c66ac9db
NB		 606{
607 unsigned long flags;
608
b1a2ecda 609 target_remove_from_state_list(cmd);
f7113a47 610
b1a2ecda
BVA		 611 /*
612 * Clear struct se_cmd->se_lun before the handoff to FE.
613 */
614 cmd->se_lun = NULL;
f7113a47 615
febe562c 616 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 617 /*
618 * Determine if frontend context caller is requesting the stopping of
e3d6f909 619 * this command for frontend exceptions.
c66ac9db 620 */
7d680f3b 621 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 622 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
623 __func__, __LINE__, cmd->tag);
c66ac9db 624
a1d8b49a 625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 626
a95d6511 627 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 628 return 1;
629 }
f7113a47 630 cmd->transport_state &= ~CMD_T_ACTIVE;
a1d8b49a 631 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 632
b1a2ecda
BVA		 633 /*
634 * Some fabric modules like tcm_loop can release their internally
635 * allocated I/O reference and struct se_cmd now.
636 *
637 * Fabric modules are expected to return '1' here if the se_cmd being
638 * passed is released at this point, or zero if not being released.
639 */
9c28ca4f 640 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 641}
642
643static void transport_lun_remove_cmd(struct se_cmd *cmd)
644{
e3d6f909 645 struct se_lun *lun = cmd->se_lun;
c66ac9db 646
5259a06e 647 if (!lun)
c66ac9db
NB		 648 return;
649
5259a06e
NB		 650 if (cmpxchg(&cmd->lun_ref_active, true, false))
651 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 652}
653
654void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
655{
febe562c
NB		 656 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
657
68259b5a
AL		 658 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
659 transport_lun_remove_cmd(cmd);
131e6abc
NB		 660 /*
661 * Allow the fabric driver to unmap any resources before
662 * releasing the descriptor via TFO->release_cmd()
663 */
664 if (remove)
665 cmd->se_tfo->aborted_task(cmd);
68259b5a 666
c66ac9db
NB		 667 if (transport_cmd_check_stop_to_fabric(cmd))
668 return;
febe562c 669 if (remove && ack_kref)
e6a2573f 670 transport_put_cmd(cmd);
c66ac9db
NB		 671}
672
35e0e757
CH		 673static void target_complete_failure_work(struct work_struct *work)
674{
675 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
676
de103c93
CH		 677 transport_generic_request_failure(cmd,
678 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 679}
680
6138ed2a 681/*
d5829eac
PB		 682 * Used when asking transport to copy Sense Data from the underlying
683 * Linux/SCSI struct scsi_cmnd
6138ed2a 684 */
d5829eac 685static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 686{
6138ed2a 687 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 688
689 WARN_ON(!cmd->se_lun);
690
691 if (!dev)
d5829eac 692 return NULL;
6138ed2a 693
d5829eac
PB		 694 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
695 return NULL;
6138ed2a 696
9c58b7dd 697 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 698
d5829eac 699 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 700 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 701 return cmd->sense_buffer;
6138ed2a
PB		 702}
703
5787cacd 704void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 705{
42bf829e 706 struct se_device *dev = cmd->se_dev;
5787cacd 707 int success = scsi_status == GOOD;
c66ac9db 708 unsigned long flags;
c66ac9db 709
5787cacd
CH		 710 cmd->scsi_status = scsi_status;
711
712
a1d8b49a 713 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 714
c66ac9db 715 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 716 dev->transport->transport_complete(cmd,
717 cmd->t_data_sg,
718 transport_get_sense_buffer(cmd));
719 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 720 success = 1;
c66ac9db
NB		 721 }
722
3d28934a 723 /*
125d0119 724 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 725 * and transport_wait_for_tasks() will be waiting for completion..
726 */
febe562c 727 if (cmd->transport_state & CMD_T_ABORTED ||
3d28934a
NB		 728 cmd->transport_state & CMD_T_STOP) {
729 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 730 complete_all(&cmd->t_transport_stop_comp);
3d28934a 731 return;
3dca1471 732 } else if (!success) {
35e0e757 733 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 734 } else {
35e0e757 735 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 736 }
35e0e757 737
35e0e757 738 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 739 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 740 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 741
9095adaa 742 if (cmd->se_cmd_flags & SCF_USE_CPUID)
fb3269ba 743 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
9095adaa
QT		 744 else
745 queue_work(target_completion_wq, &cmd->work);
c66ac9db 746}
6bb35e00
CH		 747EXPORT_SYMBOL(target_complete_cmd);
748
2426bd45
RD		 749void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
750{
61f36166 751 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
2426bd45
RD		 752 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
753 cmd->residual_count += cmd->data_length - length;
754 } else {
755 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
756 cmd->residual_count = cmd->data_length - length;
757 }
758
759 cmd->data_length = length;
760 }
761
762 target_complete_cmd(cmd, scsi_status);
763}
764EXPORT_SYMBOL(target_complete_cmd_with_length);
765
cf572a96 766static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 767{
cf572a96
CH		 768 struct se_device *dev = cmd->se_dev;
769 unsigned long flags;
c66ac9db 770
cf572a96
CH		 771 spin_lock_irqsave(&dev->execute_task_lock, flags);
772 if (!cmd->state_active) {
773 list_add_tail(&cmd->state_list, &dev->state_list);
774 cmd->state_active = true;
c66ac9db 775 }
cf572a96 776 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 777}
778
07bde79a 779/*
f147abb4 780 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 781 */
7a6f0a1e
CH		 782static void transport_write_pending_qf(struct se_cmd *cmd);
783static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 784
0fd97ccf 785void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 786{
787 struct se_device *dev = container_of(work, struct se_device,
788 qf_work_queue);
bcac364a 789 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 790 struct se_cmd *cmd, *cmd_tmp;
791
792 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 793 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
794 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 795
bcac364a 796 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 797 list_del(&cmd->se_qf_node);
33940d09 798 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 799
6708bb27 800 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 801 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 802 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 803 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
804 : "UNKNOWN");
f7a5cc0b 805
7a6f0a1e
CH		 806 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
807 transport_write_pending_qf(cmd);
fa7e25cf
NB		 808 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK ||
809 cmd->t_state == TRANSPORT_COMPLETE_QF_ERR)
7a6f0a1e 810 transport_complete_qf(cmd);
07bde79a 811 }
07bde79a
NB		 812}
813
c66ac9db
NB		 814unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
815{
816 switch (cmd->data_direction) {
817 case DMA_NONE:
818 return "NONE";
819 case DMA_FROM_DEVICE:
820 return "READ";
821 case DMA_TO_DEVICE:
822 return "WRITE";
823 case DMA_BIDIRECTIONAL:
824 return "BIDI";
825 default:
826 break;
827 }
828
829 return "UNKNOWN";
830}
831
832void transport_dump_dev_state(
833 struct se_device *dev,
834 char *b,
835 int *bl)
836{
837 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 838 if (dev->export_count)
c66ac9db 839 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 840 else
c66ac9db 841 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 842
5f41a31d 843 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 844 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 845 dev->dev_attrib.block_size,
846 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 847 *bl += sprintf(b + *bl, " ");
848}
849
c66ac9db
NB		 850void transport_dump_vpd_proto_id(
851 struct t10_vpd *vpd,
852 unsigned char *p_buf,
853 int p_buf_len)
854{
855 unsigned char buf[VPD_TMP_BUF_SIZE];
856 int len;
857
858 memset(buf, 0, VPD_TMP_BUF_SIZE);
859 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
860
861 switch (vpd->protocol_identifier) {
862 case 0x00:
863 sprintf(buf+len, "Fibre Channel\n");
864 break;
865 case 0x10:
866 sprintf(buf+len, "Parallel SCSI\n");
867 break;
868 case 0x20:
869 sprintf(buf+len, "SSA\n");
870 break;
871 case 0x30:
872 sprintf(buf+len, "IEEE 1394\n");
873 break;
874 case 0x40:
875 sprintf(buf+len, "SCSI Remote Direct Memory Access"
876 " Protocol\n");
877 break;
878 case 0x50:
879 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
880 break;
881 case 0x60:
882 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
883 break;
884 case 0x70:
885 sprintf(buf+len, "Automation/Drive Interface Transport"
886 " Protocol\n");
887 break;
888 case 0x80:
889 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
890 break;
891 default:
892 sprintf(buf+len, "Unknown 0x%02x\n",
893 vpd->protocol_identifier);
894 break;
895 }
896
897 if (p_buf)
898 strncpy(p_buf, buf, p_buf_len);
899 else
6708bb27 900 pr_debug("%s", buf);
c66ac9db
NB		 901}
902
903void
904transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
905{
906 /*
907 * Check if the Protocol Identifier Valid (PIV) bit is set..
908 *
909 * from spc3r23.pdf section 7.5.1
910 */
911 if (page_83[1] & 0x80) {
912 vpd->protocol_identifier = (page_83[0] & 0xf0);
913 vpd->protocol_identifier_set = 1;
914 transport_dump_vpd_proto_id(vpd, NULL, 0);
915 }
916}
917EXPORT_SYMBOL(transport_set_vpd_proto_id);
918
919int transport_dump_vpd_assoc(
920 struct t10_vpd *vpd,
921 unsigned char *p_buf,
922 int p_buf_len)
923{
924 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 925 int ret = 0;
926 int len;
c66ac9db
NB		 927
928 memset(buf, 0, VPD_TMP_BUF_SIZE);
929 len = sprintf(buf, "T10 VPD Identifier Association: ");
930
931 switch (vpd->association) {
932 case 0x00:
933 sprintf(buf+len, "addressed logical unit\n");
934 break;
935 case 0x10:
936 sprintf(buf+len, "target port\n");
937 break;
938 case 0x20:
939 sprintf(buf+len, "SCSI target device\n");
940 break;
941 default:
942 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 943 ret = -EINVAL;
c66ac9db
NB		 944 break;
945 }
946
947 if (p_buf)
948 strncpy(p_buf, buf, p_buf_len);
949 else
6708bb27 950 pr_debug("%s", buf);
c66ac9db
NB		 951
952 return ret;
953}
954
955int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
956{
957 /*
958 * The VPD identification association..
959 *
960 * from spc3r23.pdf Section 7.6.3.1 Table 297
961 */
962 vpd->association = (page_83[1] & 0x30);
963 return transport_dump_vpd_assoc(vpd, NULL, 0);
964}
965EXPORT_SYMBOL(transport_set_vpd_assoc);
966
967int transport_dump_vpd_ident_type(
968 struct t10_vpd *vpd,
969 unsigned char *p_buf,
970 int p_buf_len)
971{
972 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 973 int ret = 0;
974 int len;
c66ac9db
NB		 975
976 memset(buf, 0, VPD_TMP_BUF_SIZE);
977 len = sprintf(buf, "T10 VPD Identifier Type: ");
978
979 switch (vpd->device_identifier_type) {
980 case 0x00:
981 sprintf(buf+len, "Vendor specific\n");
982 break;
983 case 0x01:
984 sprintf(buf+len, "T10 Vendor ID based\n");
985 break;
986 case 0x02:
987 sprintf(buf+len, "EUI-64 based\n");
988 break;
989 case 0x03:
990 sprintf(buf+len, "NAA\n");
991 break;
992 case 0x04:
993 sprintf(buf+len, "Relative target port identifier\n");
994 break;
995 case 0x08:
996 sprintf(buf+len, "SCSI name string\n");
997 break;
998 default:
999 sprintf(buf+len, "Unsupported: 0x%02x\n",
1000 vpd->device_identifier_type);
e3d6f909 1001 ret = -EINVAL;
c66ac9db
NB		 1002 break;
1003 }
1004
e3d6f909
AG		 1005 if (p_buf) {
1006 if (p_buf_len < strlen(buf)+1)
1007 return -EINVAL;
c66ac9db 1008 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1009 } else {
6708bb27 1010 pr_debug("%s", buf);
e3d6f909 1011 }
c66ac9db
NB		 1012
1013 return ret;
1014}
1015
1016int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1017{
1018 /*
1019 * The VPD identifier type..
1020 *
1021 * from spc3r23.pdf Section 7.6.3.1 Table 298
1022 */
1023 vpd->device_identifier_type = (page_83[1] & 0x0f);
1024 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1025}
1026EXPORT_SYMBOL(transport_set_vpd_ident_type);
1027
1028int transport_dump_vpd_ident(
1029 struct t10_vpd *vpd,
1030 unsigned char *p_buf,
1031 int p_buf_len)
1032{
1033 unsigned char buf[VPD_TMP_BUF_SIZE];
1034 int ret = 0;
1035
1036 memset(buf, 0, VPD_TMP_BUF_SIZE);
1037
1038 switch (vpd->device_identifier_code_set) {
1039 case 0x01: /* Binary */
703d641d
DC		 1040 snprintf(buf, sizeof(buf),
1041 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1042 &vpd->device_identifier[0]);
1043 break;
1044 case 0x02: /* ASCII */
703d641d
DC		 1045 snprintf(buf, sizeof(buf),
1046 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1047 &vpd->device_identifier[0]);
1048 break;
1049 case 0x03: /* UTF-8 */
703d641d
DC		 1050 snprintf(buf, sizeof(buf),
1051 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1052 &vpd->device_identifier[0]);
1053 break;
1054 default:
1055 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1056 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1057 ret = -EINVAL;
c66ac9db
NB		 1058 break;
1059 }
1060
1061 if (p_buf)
1062 strncpy(p_buf, buf, p_buf_len);
1063 else
6708bb27 1064 pr_debug("%s", buf);
c66ac9db
NB		 1065
1066 return ret;
1067}
1068
1069int
1070transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1071{
1072 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1073 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1074
1075 /*
1076 * The VPD Code Set (encoding)
1077 *
1078 * from spc3r23.pdf Section 7.6.3.1 Table 296
1079 */
1080 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1081 switch (vpd->device_identifier_code_set) {
1082 case 0x01: /* Binary */
1083 vpd->device_identifier[j++] =
1084 hex_str[vpd->device_identifier_type];
1085 while (i < (4 + page_83[3])) {
1086 vpd->device_identifier[j++] =
1087 hex_str[(page_83[i] & 0xf0) >> 4];
1088 vpd->device_identifier[j++] =
1089 hex_str[page_83[i] & 0x0f];
1090 i++;
1091 }
1092 break;
1093 case 0x02: /* ASCII */
1094 case 0x03: /* UTF-8 */
1095 while (i < (4 + page_83[3]))
1096 vpd->device_identifier[j++] = page_83[i++];
1097 break;
1098 default:
1099 break;
1100 }
1101
1102 return transport_dump_vpd_ident(vpd, NULL, 0);
1103}
1104EXPORT_SYMBOL(transport_set_vpd_ident);
1105
8f9b5654
NB		 1106static sense_reason_t
1107target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1108 unsigned int size)
1109{
1110 u32 mtl;
1111
1112 if (!cmd->se_tfo->max_data_sg_nents)
1113 return TCM_NO_SENSE;
1114 /*
1115 * Check if fabric enforced maximum SGL entries per I/O descriptor
1116 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1117 * residual_count and reduce original cmd->data_length to maximum
1118 * length based on single PAGE_SIZE entry scatter-lists.
1119 */
1120 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1121 if (cmd->data_length > mtl) {
1122 /*
1123 * If an existing CDB overflow is present, calculate new residual
1124 * based on CDB size minus fabric maximum transfer length.
1125 *
1126 * If an existing CDB underflow is present, calculate new residual
1127 * based on original cmd->data_length minus fabric maximum transfer
1128 * length.
1129 *
1130 * Otherwise, set the underflow residual based on cmd->data_length
1131 * minus fabric maximum transfer length.
1132 */
1133 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1134 cmd->residual_count = (size - mtl);
1135 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1136 u32 orig_dl = size + cmd->residual_count;
1137 cmd->residual_count = (orig_dl - mtl);
1138 } else {
1139 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1140 cmd->residual_count = (cmd->data_length - mtl);
1141 }
1142 cmd->data_length = mtl;
1143 /*
1144 * Reset sbc_check_prot() calculated protection payload
1145 * length based upon the new smaller MTL.
1146 */
1147 if (cmd->prot_length) {
1148 u32 sectors = (mtl / dev->dev_attrib.block_size);
1149 cmd->prot_length = dev->prot_length * sectors;
1150 }
1151 }
1152 return TCM_NO_SENSE;
1153}
1154
de103c93
CH		 1155sense_reason_t
1156target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1157{
1158 struct se_device *dev = cmd->se_dev;
1159
1160 if (cmd->unknown_data_length) {
1161 cmd->data_length = size;
1162 } else if (size != cmd->data_length) {
4ff83daa 1163 pr_warn_ratelimited("TARGET_CORE[%s]: Expected Transfer Length:"
9b3b8041
CH		 1164 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1165 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1166 cmd->data_length, size, cmd->t_task_cdb[0]);
1167
4ff83daa
NB		 1168 if (cmd->data_direction == DMA_TO_DEVICE) {
1169 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1170 pr_err_ratelimited("Rejecting underflow/overflow"
1171 " for WRITE data CDB\n");
1172 return TCM_INVALID_CDB_FIELD;
1173 }
1174 /*
1175 * Some fabric drivers like iscsi-target still expect to
1176 * always reject overflow writes. Reject this case until
1177 * full fabric driver level support for overflow writes
1178 * is introduced tree-wide.
1179 */
1180 if (size > cmd->data_length) {
1181 pr_err_ratelimited("Rejecting overflow for"
1182 " WRITE control CDB\n");
1183 return TCM_INVALID_CDB_FIELD;
1184 }
9b3b8041
CH		 1185 }
1186 /*
1187 * Reject READ_* or WRITE_* with overflow/underflow for
1188 * type SCF_SCSI_DATA_CDB.
1189 */
0fd97ccf 1190 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1191 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1192 " CDB on non 512-byte sector setup subsystem"
1193 " plugin: %s\n", dev->transport->name);
1194 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1195 return TCM_INVALID_CDB_FIELD;
9b3b8041 1196 }
4c054ba6
NB		 1197 /*
1198 * For the overflow case keep the existing fabric provided
1199 * ->data_length. Otherwise for the underflow case, reset
1200 * ->data_length to the smaller SCSI expected data transfer
1201 * length.
1202 */
9b3b8041
CH		 1203 if (size > cmd->data_length) {
1204 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1205 cmd->residual_count = (size - cmd->data_length);
1206 } else {
1207 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1208 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1209 cmd->data_length = size;
9b3b8041 1210 }
9b3b8041
CH		 1211 }
1212
8f9b5654 1213 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1214
9b3b8041
CH		 1215}
1216
c66ac9db
NB		 1217/*
1218 * Used by fabric modules containing a local struct se_cmd within their
1219 * fabric dependent per I/O descriptor.
649ee054
BVA		 1220 *
1221 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1222 */
1223void transport_init_se_cmd(
1224 struct se_cmd *cmd,
9ac8928e 1225 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1226 struct se_session *se_sess,
1227 u32 data_length,
1228 int data_direction,
1229 int task_attr,
1230 unsigned char *sense_buffer)
1231{
5951146d 1232 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1233 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1234 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1235 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1236 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1237 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1238 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1239 kref_init(&cmd->cmd_kref);
c66ac9db
NB		 1240
1241 cmd->se_tfo = tfo;
1242 cmd->se_sess = se_sess;
1243 cmd->data_length = data_length;
1244 cmd->data_direction = data_direction;
1245 cmd->sam_task_attr = task_attr;
1246 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1247
1248 cmd->state_active = false;
c66ac9db
NB		 1249}
1250EXPORT_SYMBOL(transport_init_se_cmd);
1251
de103c93
CH		 1252static sense_reason_t
1253transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1254{
019c4ca6
CH		 1255 struct se_device *dev = cmd->se_dev;
1256
c66ac9db
NB		 1257 /*
1258 * Check if SAM Task Attribute emulation is enabled for this
1259 * struct se_device storage object
1260 */
a3541703 1261 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1262 return 0;
1263
68d81f40 1264 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1265 pr_debug("SAM Task Attribute ACA"
c66ac9db 1266 " emulation is not supported\n");
de103c93 1267 return TCM_INVALID_CDB_FIELD;
c66ac9db 1268 }
9c31820b 1269
c66ac9db
NB		 1270 return 0;
1271}
1272
de103c93
CH		 1273sense_reason_t
1274target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1275{
0fd97ccf 1276 struct se_device *dev = cmd->se_dev;
de103c93 1277 sense_reason_t ret;
c66ac9db 1278
c66ac9db
NB		 1279 /*
1280 * Ensure that the received CDB is less than the max (252 + 8) bytes
1281 * for VARIABLE_LENGTH_CMD
1282 */
1283 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1284 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1285 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1286 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1287 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1288 }
1289 /*
1290 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1291 * allocate the additional extended CDB buffer now.. Otherwise
1292 * setup the pointer from __t_task_cdb to t_task_cdb.
1293 */
a1d8b49a
AG		 1294 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1295 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1296 GFP_KERNEL);
6708bb27
AG		 1297 if (!cmd->t_task_cdb) {
1298 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1299 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1300 scsi_command_size(cdb),
a1d8b49a 1301 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1302 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1303 }
1304 } else
a1d8b49a 1305 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1306 /*
a1d8b49a 1307 * Copy the original CDB into cmd->
c66ac9db 1308 */
a1d8b49a 1309 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1310
e5c0d6ad
RD		 1311 trace_target_sequencer_start(cmd);
1312
0fd97ccf 1313 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1314 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1315 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1316 cmd->se_tfo->get_fabric_name(),
1317 cmd->se_sess->se_node_acl->initiatorname,
1318 cmd->t_task_cdb[0]);
de103c93
CH		 1319 if (ret)
1320 return ret;
1321
1322 ret = transport_check_alloc_task_attr(cmd);
1323 if (ret)
c66ac9db 1324 return ret;
cb4f4d3c 1325
cb4f4d3c 1326 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1327 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1328 return 0;
1329}
a12f41f8 1330EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1331
695434e1
NB		 1332/*
1333 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1334 * May only be used from process context.
695434e1
NB		 1335 */
1336int transport_handle_cdb_direct(
1337 struct se_cmd *cmd)
1338{
de103c93 1339 sense_reason_t ret;
dd8ae59d 1340
695434e1
NB		 1341 if (!cmd->se_lun) {
1342 dump_stack();
6708bb27 1343 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1344 return -EINVAL;
1345 }
1346 if (in_interrupt()) {
1347 dump_stack();
6708bb27 1348 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1349 " from interrupt context\n");
1350 return -EINVAL;
1351 }
dd8ae59d 1352 /*
af877292
CH		 1353 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1354 * outstanding descriptors are handled correctly during shutdown via
1355 * transport_wait_for_tasks()
dd8ae59d
NB		 1356 *
1357 * Also, we don't take cmd->t_state_lock here as we only expect
1358 * this to be called for initial descriptor submission.
1359 */
1360 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1361 cmd->transport_state |= CMD_T_ACTIVE;
1362
dd8ae59d
NB		 1363 /*
1364 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1365 * so follow TRANSPORT_NEW_CMD processing thread context usage
1366 * and call transport_generic_request_failure() if necessary..
1367 */
1368 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1369 if (ret)
1370 transport_generic_request_failure(cmd, ret);
dd8ae59d 1371 return 0;
695434e1
NB		 1372}
1373EXPORT_SYMBOL(transport_handle_cdb_direct);
1374
c5ff8d6b 1375sense_reason_t
de103c93
CH		 1376transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1377 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1378{
1379 if (!sgl || !sgl_count)
1380 return 0;
1381
1382 /*
1383 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1384 * scatterlists already have been set to follow what the fabric
1385 * passes for the original expected data transfer length.
1386 */
1387 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1388 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1389 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1390 return TCM_INVALID_CDB_FIELD;
1391 }
1392
1393 cmd->t_data_sg = sgl;
1394 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1395 cmd->t_bidi_data_sg = sgl_bidi;
1396 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1397
de103c93
CH		 1398 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1399 return 0;
1400}
1401
a026757f
NB		 1402/*
1403 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1404 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1405 *
1406 * @se_cmd: command descriptor to submit
1407 * @se_sess: associated se_sess for endpoint
1408 * @cdb: pointer to SCSI CDB
1409 * @sense: pointer to SCSI sense buffer
1410 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1411 * @data_length: fabric expected data transfer length
1412 * @task_addr: SAM task attribute
1413 * @data_dir: DMA data direction
1414 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1415 * @sgl: struct scatterlist memory for unidirectional mapping
1416 * @sgl_count: scatterlist count for unidirectional mapping
1417 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1418 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1419 * @sgl_prot: struct scatterlist memory protection information
1420 * @sgl_prot_count: scatterlist count for protection information
a6360785 1421 *
649ee054
BVA		 1422 * Task tags are supported if the caller has set @se_cmd->tag.
1423 *
d6dfc868
RD		 1424 * Returns non zero to signal active I/O shutdown failure. All other
1425 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1426 * but still return zero here.
1427 *
a6360785
NB		 1428 * This may only be called from process context, and also currently
1429 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1430 */
1431int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1432 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1433 u32 data_length, int task_attr, int data_dir, int flags,
1434 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1435 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1436 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1437{
1438 struct se_portal_group *se_tpg;
de103c93
CH		 1439 sense_reason_t rc;
1440 int ret;
a6360785
NB		 1441
1442 se_tpg = se_sess->se_tpg;
1443 BUG_ON(!se_tpg);
1444 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1445 BUG_ON(in_interrupt());
1446 /*
1447 * Initialize se_cmd for target operation. From this point
1448 * exceptions are handled by sending exception status via
1449 * target_core_fabric_ops->queue_status() callback
1450 */
1451 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1452 data_length, data_dir, task_attr, sense);
9095adaa
QT		 1453
1454 if (flags & TARGET_SCF_USE_CPUID)
1455 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1456 else
1457 se_cmd->cpuid = WORK_CPU_UNBOUND;
1458
b0d79946
SAS		 1459 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1460 se_cmd->unknown_data_length = 1;
a6360785
NB		 1461 /*
1462 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1463 * se_sess->sess_cmd_list. A second kref_get here is necessary
1464 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1465 * kref_put() to happen during fabric packet acknowledgement.
1466 */
afc16604 1467 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1468 if (ret)
1469 return ret;
a6360785
NB		 1470 /*
1471 * Signal bidirectional data payloads to target-core
1472 */
1473 if (flags & TARGET_SCF_BIDI_OP)
1474 se_cmd->se_cmd_flags |= SCF_BIDI;
1475 /*
1476 * Locate se_lun pointer and attach it to struct se_cmd
1477 */
de103c93
CH		 1478 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1479 if (rc) {
1480 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1481 target_put_sess_cmd(se_cmd);
d6dfc868 1482 return 0;
735703ca 1483 }
b5b8e298
SG		 1484
1485 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1486 if (rc != 0) {
1487 transport_generic_request_failure(se_cmd, rc);
1488 return 0;
1489 }
1490
def2b339
NB		 1491 /*
1492 * Save pointers for SGLs containing protection information,
1493 * if present.
1494 */
1495 if (sgl_prot_count) {
1496 se_cmd->t_prot_sg = sgl_prot;
1497 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1498 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1499 }
d6e0175c 1500
a026757f
NB		 1501 /*
1502 * When a non zero sgl_count has been passed perform SGL passthrough
1503 * mapping for pre-allocated fabric memory instead of having target
1504 * core perform an internal SGL allocation..
1505 */
1506 if (sgl_count != 0) {
1507 BUG_ON(!sgl);
1508
944981c7
NB		 1509 /*
1510 * A work-around for tcm_loop as some userspace code via
1511 * scsi-generic do not memset their associated read buffers,
1512 * so go ahead and do that here for type non-data CDBs. Also
1513 * note that this is currently guaranteed to be a single SGL
1514 * for this case by target core in target_setup_cmd_from_cdb()
1515 * -> transport_generic_cmd_sequencer().
1516 */
1517 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1518 se_cmd->data_direction == DMA_FROM_DEVICE) {
1519 unsigned char *buf = NULL;
1520
1521 if (sgl)
1522 buf = kmap(sg_page(sgl)) + sgl->offset;
1523
1524 if (buf) {
1525 memset(buf, 0, sgl->length);
1526 kunmap(sg_page(sgl));
1527 }
1528 }
1529
a026757f
NB		 1530 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1531 sgl_bidi, sgl_bidi_count);
1532 if (rc != 0) {
de103c93 1533 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1534 return 0;
1535 }
1536 }
def2b339 1537
11e319ed
AG		 1538 /*
1539 * Check if we need to delay processing because of ALUA
1540 * Active/NonOptimized primary access state..
1541 */
1542 core_alua_check_nonop_delay(se_cmd);
1543
a6360785 1544 transport_handle_cdb_direct(se_cmd);
d6dfc868 1545 return 0;
a6360785 1546}
a026757f
NB		 1547EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1548
1549/*
1550 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1551 *
1552 * @se_cmd: command descriptor to submit
1553 * @se_sess: associated se_sess for endpoint
1554 * @cdb: pointer to SCSI CDB
1555 * @sense: pointer to SCSI sense buffer
1556 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1557 * @data_length: fabric expected data transfer length
1558 * @task_addr: SAM task attribute
1559 * @data_dir: DMA data direction
1560 * @flags: flags for command submission from target_sc_flags_tables
1561 *
649ee054
BVA		 1562 * Task tags are supported if the caller has set @se_cmd->tag.
1563 *
a026757f
NB		 1564 * Returns non zero to signal active I/O shutdown failure. All other
1565 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1566 * but still return zero here.
1567 *
1568 * This may only be called from process context, and also currently
1569 * assumes internal allocation of fabric payload buffer by target-core.
1570 *
1571 * It also assumes interal target core SGL memory allocation.
1572 */
1573int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1574 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1575 u32 data_length, int task_attr, int data_dir, int flags)
1576{
1577 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1578 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1579 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1580}
a6360785
NB		 1581EXPORT_SYMBOL(target_submit_cmd);
1582
9f0d05c2
NB		 1583static void target_complete_tmr_failure(struct work_struct *work)
1584{
1585 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1586
1587 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1588 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1589
1590 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1591}
1592
ea98d7f9
AG		 1593/**
1594 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1595 * for TMR CDBs
1596 *
1597 * @se_cmd: command descriptor to submit
1598 * @se_sess: associated se_sess for endpoint
1599 * @sense: pointer to SCSI sense buffer
1600 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1601 * @fabric_context: fabric context for TMR req
1602 * @tm_type: Type of TM request
c0974f89
NB		 1603 * @gfp: gfp type for caller
1604 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1605 * @flags: submit cmd flags
ea98d7f9
AG		 1606 *
1607 * Callable from all contexts.
1608 **/
1609
c7042cae 1610int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1611 unsigned char *sense, u64 unpacked_lun,
c0974f89 1612 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1613 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1614{
1615 struct se_portal_group *se_tpg;
1616 int ret;
1617
1618 se_tpg = se_sess->se_tpg;
1619 BUG_ON(!se_tpg);
1620
1621 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1622 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1623 /*
1624 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1625 * allocation failure.
1626 */
c0974f89 1627 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1628 if (ret < 0)
1629 return -ENOMEM;
ea98d7f9 1630
c0974f89
NB		 1631 if (tm_type == TMR_ABORT_TASK)
1632 se_cmd->se_tmr_req->ref_task_tag = tag;
1633
ea98d7f9 1634 /* See target_submit_cmd for commentary */
afc16604 1635 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1636 if (ret) {
1637 core_tmr_release_req(se_cmd->se_tmr_req);
1638 return ret;
1639 }
ea98d7f9 1640
ea98d7f9
AG		 1641 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1642 if (ret) {
9f0d05c2
NB		 1643 /*
1644 * For callback during failure handling, push this work off
1645 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1646 */
1647 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1648 schedule_work(&se_cmd->work);
c7042cae 1649 return 0;
ea98d7f9
AG		 1650 }
1651 transport_generic_handle_tmr(se_cmd);
c7042cae 1652 return 0;
ea98d7f9
AG		 1653}
1654EXPORT_SYMBOL(target_submit_tmr);
1655
c66ac9db
NB		 1656/*
1657 * Handle SAM-esque emulation for generic transport request failures.
1658 */
de103c93
CH		 1659void transport_generic_request_failure(struct se_cmd *cmd,
1660 sense_reason_t sense_reason)
c66ac9db 1661{
057085e5 1662 int ret = 0, post_ret = 0;
07bde79a 1663
e3b88ee9
BVA		 1664 if (transport_check_aborted_status(cmd, 1))
1665 return;
1666
649ee054
BVA		 1667 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1668 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1669 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1670 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1671 cmd->t_state, sense_reason);
d43d6aea 1672 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1673 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1674 (cmd->transport_state & CMD_T_STOP) != 0,
1675 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1676
c66ac9db
NB		 1677 /*
1678 * For SAM Task Attribute emulation for failed struct se_cmd
1679 */
019c4ca6 1680 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1681 /*
1682 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1683 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1684 */
1685 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1686 cmd->transport_complete_callback)
057085e5 1687 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1688
de103c93 1689 switch (sense_reason) {
03e98c9e
NB		 1690 case TCM_NON_EXISTENT_LUN:
1691 case TCM_UNSUPPORTED_SCSI_OPCODE:
1692 case TCM_INVALID_CDB_FIELD:
1693 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1694 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1695 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1696 case TCM_UNKNOWN_MODE_PAGE:
1697 case TCM_WRITE_PROTECTED:
e2397c70 1698 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1699 case TCM_CHECK_CONDITION_ABORT_CMD:
1700 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1701 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1702 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1703 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1704 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
449a1378 1705 case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE:
e8642120
DD		 1706 case TCM_TOO_MANY_TARGET_DESCS:
1707 case TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE:
1708 case TCM_TOO_MANY_SEGMENT_DESCS:
1709 case TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE:
c66ac9db 1710 break;
de103c93
CH		 1711 case TCM_OUT_OF_RESOURCES:
1712 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1713 break;
03e98c9e 1714 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1715 /*
1716 * No SENSE Data payload for this case, set SCSI Status
1717 * and queue the response to $FABRIC_MOD.
1718 *
1719 * Uses linux/include/scsi/scsi.h SAM status codes defs
1720 */
1721 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1722 /*
1723 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1724 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1725 * CONFLICT STATUS.
1726 *
1727 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1728 */
e3d6f909 1729 if (cmd->se_sess &&
c51c8e7b
HR		 1730 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1731 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1732 cmd->orig_fe_lun, 0x2C,
1733 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1734 }
e5c0d6ad 1735 trace_target_cmd_complete(cmd);
c51c8e7b 1736 ret = cmd->se_tfo->queue_status(cmd);
fa7e25cf 1737 if (ret)
07bde79a 1738 goto queue_full;
c66ac9db 1739 goto check_stop;
c66ac9db 1740 default:
6708bb27 1741 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1742 cmd->t_task_cdb[0], sense_reason);
1743 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1744 break;
1745 }
f3146437 1746
de103c93 1747 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
fa7e25cf 1748 if (ret)
03e98c9e 1749 goto queue_full;
07bde79a 1750
c66ac9db
NB		 1751check_stop:
1752 transport_lun_remove_cmd(cmd);
06b967e4 1753 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1754 return;
1755
1756queue_full:
fa7e25cf 1757 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db 1758}
2fbff127 1759EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1760
dff0ca9e 1761void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
c66ac9db 1762{
de103c93 1763 sense_reason_t ret;
5f41a31d 1764
dff0ca9e
NB		 1765 if (!cmd->execute_cmd) {
1766 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1767 goto err;
1768 }
1769 if (do_checks) {
1770 /*
1771 * Check for an existing UNIT ATTENTION condition after
1772 * target_handle_task_attr() has done SAM task attr
1773 * checking, and possibly have already defered execution
1774 * out to target_restart_delayed_cmds() context.
1775 */
1776 ret = target_scsi3_ua_check(cmd);
1777 if (ret)
1778 goto err;
1779
1780 ret = target_alua_state_check(cmd);
1781 if (ret)
1782 goto err;
5f41a31d 1783
dff0ca9e
NB		 1784 ret = target_check_reservation(cmd);
1785 if (ret) {
1786 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1787 goto err;
de103c93 1788 }
5f41a31d 1789 }
dff0ca9e
NB		 1790
1791 ret = cmd->execute_cmd(cmd);
1792 if (!ret)
1793 return;
1794err:
1795 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1796 cmd->transport_state &= ~CMD_T_SENT;
dff0ca9e
NB		 1797 spin_unlock_irq(&cmd->t_state_lock);
1798
1799 transport_generic_request_failure(cmd, ret);
5f41a31d
CH		 1800}
1801
aa58b531
NB		 1802static int target_write_prot_action(struct se_cmd *cmd)
1803{
5132d1e6 1804 u32 sectors;
aa58b531
NB		 1805 /*
1806 * Perform WRITE_INSERT of PI using software emulation when backend
1807 * device has PI enabled, if the transport has not already generated
1808 * PI using hardware WRITE_INSERT offload.
1809 */
1810 switch (cmd->prot_op) {
1811 case TARGET_PROT_DOUT_INSERT:
1812 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1813 sbc_dif_generate(cmd);
1814 break;
5132d1e6
NB		 1815 case TARGET_PROT_DOUT_STRIP:
1816 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1817 break;
1818
1819 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1820 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1821 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1822 if (unlikely(cmd->pi_err)) {
1823 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1824 cmd->transport_state &= ~CMD_T_SENT;
5132d1e6
NB		 1825 spin_unlock_irq(&cmd->t_state_lock);
1826 transport_generic_request_failure(cmd, cmd->pi_err);
1827 return -1;
1828 }
1829 break;
aa58b531
NB		 1830 default:
1831 break;
1832 }
1833
1834 return 0;
1835}
1836
019c4ca6 1837static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1838{
1839 struct se_device *dev = cmd->se_dev;
1840
a3541703 1841 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1842 return false;
5f41a31d 1843
410c29df
NB		 1844 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1845
c66ac9db 1846 /*
25985edc 1847 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1848 * to allow the passed struct se_cmd list of tasks to the front of the list.
1849 */
5f41a31d 1850 switch (cmd->sam_task_attr) {
68d81f40 1851 case TCM_HEAD_TAG:
9c31820b
RD		 1852 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1853 cmd->t_task_cdb[0]);
019c4ca6 1854 return false;
68d81f40 1855 case TCM_ORDERED_TAG:
33940d09 1856 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1857
9c31820b
RD		 1858 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1859 cmd->t_task_cdb[0]);
5f41a31d 1860
c66ac9db 1861 /*
5f41a31d
CH		 1862 * Execute an ORDERED command if no other older commands
1863 * exist that need to be completed first.
c66ac9db 1864 */
5f41a31d 1865 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1866 return false;
5f41a31d
CH		 1867 break;
1868 default:
c66ac9db
NB		 1869 /*
1870 * For SIMPLE and UNTAGGED Task Attribute commands
1871 */
33940d09 1872 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1873 break;
c66ac9db 1874 }
5f41a31d 1875
019c4ca6
CH		 1876 if (atomic_read(&dev->dev_ordered_sync) == 0)
1877 return false;
c66ac9db 1878
019c4ca6
CH		 1879 spin_lock(&dev->delayed_cmd_lock);
1880 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1881 spin_unlock(&dev->delayed_cmd_lock);
1882
9c31820b
RD		 1883 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1884 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1885 return true;
1886}
1887
310d3d31
NB		 1888static int __transport_check_aborted_status(struct se_cmd *, int);
1889
019c4ca6
CH		 1890void target_execute_cmd(struct se_cmd *cmd)
1891{
019c4ca6
CH		 1892 /*
1893 * Determine if frontend context caller is requesting the stopping of
1894 * this command for frontend exceptions.
310d3d31
NB		 1895 *
1896 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1897 */
4a9a6c8d 1898 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1899 if (__transport_check_aborted_status(cmd, 1)) {
1900 spin_unlock_irq(&cmd->t_state_lock);
1901 return;
1902 }
019c4ca6 1903 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1904 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1905 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1906
1907 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1908 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1909 return;
1910 }
1911
1912 cmd->t_state = TRANSPORT_PROCESSING;
fd5e64de 1913 cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT;
019c4ca6 1914 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1915
1916 if (target_write_prot_action(cmd))
1917 return;
019c4ca6 1918
1a398b97
NB		 1919 if (target_handle_task_attr(cmd)) {
1920 spin_lock_irq(&cmd->t_state_lock);
fd5e64de 1921 cmd->transport_state &= ~CMD_T_SENT;
1a398b97
NB		 1922 spin_unlock_irq(&cmd->t_state_lock);
1923 return;
1924 }
1925
dff0ca9e 1926 __target_execute_cmd(cmd, true);
c66ac9db 1927}
70baf0ab 1928EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1929
5f41a31d
CH		 1930/*
1931 * Process all commands up to the last received ORDERED task attribute which
1932 * requires another blocking boundary
1933 */
1934static void target_restart_delayed_cmds(struct se_device *dev)
1935{
1936 for (;;) {
1937 struct se_cmd *cmd;
1938
1939 spin_lock(&dev->delayed_cmd_lock);
1940 if (list_empty(&dev->delayed_cmd_list)) {
1941 spin_unlock(&dev->delayed_cmd_lock);
1942 break;
1943 }
1944
1945 cmd = list_entry(dev->delayed_cmd_list.next,
1946 struct se_cmd, se_delayed_node);
1947 list_del(&cmd->se_delayed_node);
1948 spin_unlock(&dev->delayed_cmd_lock);
1949
dff0ca9e 1950 __target_execute_cmd(cmd, true);
5f41a31d 1951
68d81f40 1952 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1953 break;
1954 }
1955}
1956
c66ac9db 1957/*
35e0e757 1958 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1959 * and ordered cmds need to have their tasks added to the execution queue.
1960 */
1961static void transport_complete_task_attr(struct se_cmd *cmd)
1962{
5951146d 1963 struct se_device *dev = cmd->se_dev;
c66ac9db 1964
a3541703 1965 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1966 return;
1967
410c29df
NB		 1968 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
1969 goto restart;
1970
68d81f40 1971 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1972 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1973 dev->dev_cur_ordered_id++;
68d81f40 1974 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1975 dev->dev_cur_ordered_id++;
9c31820b
RD		 1976 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1977 dev->dev_cur_ordered_id);
68d81f40 1978 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1979 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1980
1981 dev->dev_cur_ordered_id++;
9c31820b
RD		 1982 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1983 dev->dev_cur_ordered_id);
c66ac9db 1984 }
410c29df 1985restart:
5f41a31d 1986 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1987}
1988
e057f533 1989static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1990{
1991 int ret = 0;
1992
019c4ca6 1993 transport_complete_task_attr(cmd);
fa7e25cf
NB		 1994 /*
1995 * If a fabric driver ->write_pending() or ->queue_data_in() callback
1996 * has returned neither -ENOMEM or -EAGAIN, assume it's fatal and
1997 * the same callbacks should not be retried. Return CHECK_CONDITION
1998 * if a scsi_status is not already set.
1999 *
2000 * If a fabric driver ->queue_status() has returned non zero, always
2001 * keep retrying no matter what..
2002 */
2003 if (cmd->t_state == TRANSPORT_COMPLETE_QF_ERR) {
2004 if (cmd->scsi_status)
2005 goto queue_status;
e057f533 2006
fa7e25cf
NB		 2007 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2008 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2009 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
2010 translate_sense_reason(cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
2011 goto queue_status;
e057f533 2012 }
07bde79a 2013
fa7e25cf
NB		 2014 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
2015 goto queue_status;
2016
07bde79a
NB		 2017 switch (cmd->data_direction) {
2018 case DMA_FROM_DEVICE:
4347ab5a
NB		 2019 if (cmd->scsi_status)
2020 goto queue_status;
2021
e5c0d6ad 2022 trace_target_cmd_complete(cmd);
07bde79a
NB		 2023 ret = cmd->se_tfo->queue_data_in(cmd);
2024 break;
2025 case DMA_TO_DEVICE:
64577407 2026 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 2027 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 2028 break;
07bde79a
NB		 2029 }
2030 /* Fall through for DMA_TO_DEVICE */
2031 case DMA_NONE:
4347ab5a 2032queue_status:
e5c0d6ad 2033 trace_target_cmd_complete(cmd);
07bde79a
NB		 2034 ret = cmd->se_tfo->queue_status(cmd);
2035 break;
2036 default:
2037 break;
2038 }
2039
e057f533 2040 if (ret < 0) {
fa7e25cf 2041 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
e057f533
CH		 2042 return;
2043 }
2044 transport_lun_remove_cmd(cmd);
2045 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2046}
2047
fa7e25cf
NB		 2048static void transport_handle_queue_full(struct se_cmd *cmd, struct se_device *dev,
2049 int err, bool write_pending)
07bde79a 2050{
fa7e25cf
NB		 2051 /*
2052 * -EAGAIN or -ENOMEM signals retry of ->write_pending() and/or
2053 * ->queue_data_in() callbacks from new process context.
2054 *
2055 * Otherwise for other errors, transport_complete_qf() will send
2056 * CHECK_CONDITION via ->queue_status() instead of attempting to
2057 * retry associated fabric driver data-transfer callbacks.
2058 */
2059 if (err == -EAGAIN || err == -ENOMEM) {
2060 cmd->t_state = (write_pending) ? TRANSPORT_COMPLETE_QF_WP :
2061 TRANSPORT_COMPLETE_QF_OK;
2062 } else {
2063 pr_warn_ratelimited("Got unknown fabric queue status: %d\n", err);
2064 cmd->t_state = TRANSPORT_COMPLETE_QF_ERR;
2065 }
2066
07bde79a 2067 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2068 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2069 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2070 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2071
2072 schedule_work(&cmd->se_dev->qf_work_queue);
2073}
2074
fdeab852 2075static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2076{
fdeab852
NB		 2077 switch (cmd->prot_op) {
2078 case TARGET_PROT_DIN_STRIP:
2079 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2080 u32 sectors = cmd->data_length >>
2081 ilog2(cmd->se_dev->dev_attrib.block_size);
2082
2083 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2084 sectors, 0, cmd->t_prot_sg,
2085 0);
2086 if (cmd->pi_err)
fdeab852 2087 return true;
bc005869 2088 }
fdeab852 2089 break;
72c03850
NB		 2090 case TARGET_PROT_DIN_INSERT:
2091 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2092 break;
2093
2094 sbc_dif_generate(cmd);
2095 break;
fdeab852
NB		 2096 default:
2097 break;
bc005869
NB		 2098 }
2099
2100 return false;
2101}
2102
35e0e757 2103static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2104{
35e0e757 2105 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2106 int ret;
35e0e757 2107
c66ac9db
NB		 2108 /*
2109 * Check if we need to move delayed/dormant tasks from cmds on the
2110 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2111 * Attribute.
2112 */
019c4ca6
CH		 2113 transport_complete_task_attr(cmd);
2114
07bde79a
NB		 2115 /*
2116 * Check to schedule QUEUE_FULL work, or execute an existing
2117 * cmd->transport_qf_callback()
2118 */
2119 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2120 schedule_work(&cmd->se_dev->qf_work_queue);
2121
c66ac9db 2122 /*
d5829eac 2123 * Check if we need to send a sense buffer from
c66ac9db
NB		 2124 * the struct se_cmd in question.
2125 */
2126 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2127 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2128 ret = transport_send_check_condition_and_sense(
2129 cmd, 0, 1);
fa7e25cf 2130 if (ret)
27a27099
PB		 2131 goto queue_full;
2132
2133 transport_lun_remove_cmd(cmd);
2134 transport_cmd_check_stop_to_fabric(cmd);
2135 return;
c66ac9db
NB		 2136 }
2137 /*
25985edc 2138 * Check for a callback, used by amongst other things
a6b0133c 2139 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2140 */
a6b0133c
NB		 2141 if (cmd->transport_complete_callback) {
2142 sense_reason_t rc;
057085e5
NB		 2143 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2144 bool zero_dl = !(cmd->data_length);
2145 int post_ret = 0;
a6b0133c 2146
057085e5
NB		 2147 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2148 if (!rc && !post_ret) {
2149 if (caw && zero_dl)
c8e63985
NB		 2150 goto queue_rsp;
2151
a6b0133c 2152 return;
a2890087
NB		 2153 } else if (rc) {
2154 ret = transport_send_check_condition_and_sense(cmd,
2155 rc, 0);
fa7e25cf 2156 if (ret)
a2890087 2157 goto queue_full;
a6b0133c 2158
a2890087
NB		 2159 transport_lun_remove_cmd(cmd);
2160 transport_cmd_check_stop_to_fabric(cmd);
2161 return;
2162 }
a6b0133c 2163 }
c66ac9db 2164
c8e63985 2165queue_rsp:
c66ac9db
NB		 2166 switch (cmd->data_direction) {
2167 case DMA_FROM_DEVICE:
4347ab5a
NB		 2168 if (cmd->scsi_status)
2169 goto queue_status;
2170
4cc987ea
NB		 2171 atomic_long_add(cmd->data_length,
2172 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2173 /*
2174 * Perform READ_STRIP of PI using software emulation when
2175 * backend had PI enabled, if the transport will not be
2176 * performing hardware READ_STRIP offload.
2177 */
fdeab852 2178 if (target_read_prot_action(cmd)) {
bc005869
NB		 2179 ret = transport_send_check_condition_and_sense(cmd,
2180 cmd->pi_err, 0);
fa7e25cf 2181 if (ret)
bc005869
NB		 2182 goto queue_full;
2183
2184 transport_lun_remove_cmd(cmd);
2185 transport_cmd_check_stop_to_fabric(cmd);
2186 return;
2187 }
c66ac9db 2188
e5c0d6ad 2189 trace_target_cmd_complete(cmd);
07bde79a 2190 ret = cmd->se_tfo->queue_data_in(cmd);
fa7e25cf 2191 if (ret)
07bde79a 2192 goto queue_full;
c66ac9db
NB		 2193 break;
2194 case DMA_TO_DEVICE:
4cc987ea
NB		 2195 atomic_long_add(cmd->data_length,
2196 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2197 /*
2198 * Check if we need to send READ payload for BIDI-COMMAND
2199 */
64577407 2200 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2201 atomic_long_add(cmd->data_length,
2202 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2203 ret = cmd->se_tfo->queue_data_in(cmd);
fa7e25cf 2204 if (ret)
07bde79a 2205 goto queue_full;
c66ac9db
NB		 2206 break;
2207 }
2208 /* Fall through for DMA_TO_DEVICE */
2209 case DMA_NONE:
4347ab5a 2210queue_status:
e5c0d6ad 2211 trace_target_cmd_complete(cmd);
07bde79a 2212 ret = cmd->se_tfo->queue_status(cmd);
fa7e25cf 2213 if (ret)
07bde79a 2214 goto queue_full;
c66ac9db
NB		 2215 break;
2216 default:
2217 break;
2218 }
2219
2220 transport_lun_remove_cmd(cmd);
2221 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2222 return;
2223
2224queue_full:
6708bb27 2225 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2226 " data_direction: %d\n", cmd, cmd->data_direction);
fa7e25cf
NB		 2227
2228 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 2229}
2230
e64aa657 2231void target_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2232{
ec98f782 2233 struct scatterlist *sg;
ec98f782 2234 int count;
c66ac9db 2235
6708bb27
AG		 2236 for_each_sg(sgl, sg, nents, count)
2237 __free_page(sg_page(sg));
c66ac9db 2238
6708bb27
AG		 2239 kfree(sgl);
2240}
e64aa657 2241EXPORT_SYMBOL(target_free_sgl);
c66ac9db 2242
47e459e6
NB		 2243static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2244{
2245 /*
2246 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2247 * emulation, and free + reset pointers if necessary..
2248 */
2249 if (!cmd->t_data_sg_orig)
2250 return;
2251
2252 kfree(cmd->t_data_sg);
2253 cmd->t_data_sg = cmd->t_data_sg_orig;
2254 cmd->t_data_sg_orig = NULL;
2255 cmd->t_data_nents = cmd->t_data_nents_orig;
2256 cmd->t_data_nents_orig = 0;
2257}
2258
6708bb27
AG		 2259static inline void transport_free_pages(struct se_cmd *cmd)
2260{
5835812f 2261 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
e64aa657 2262 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
5835812f
AM		 2263 cmd->t_prot_sg = NULL;
2264 cmd->t_prot_nents = 0;
2265 }
2266
47e459e6 2267 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2268 /*
2269 * Release special case READ buffer payload required for
2270 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2271 */
2272 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
e64aa657 2273 target_free_sgl(cmd->t_bidi_data_sg,
c8e63985
NB		 2274 cmd->t_bidi_data_nents);
2275 cmd->t_bidi_data_sg = NULL;
2276 cmd->t_bidi_data_nents = 0;
2277 }
47e459e6 2278 transport_reset_sgl_orig(cmd);
6708bb27 2279 return;
47e459e6
NB		 2280 }
2281 transport_reset_sgl_orig(cmd);
6708bb27 2282
e64aa657 2283 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2284 cmd->t_data_sg = NULL;
2285 cmd->t_data_nents = 0;
c66ac9db 2286
e64aa657 2287 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2288 cmd->t_bidi_data_sg = NULL;
2289 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2290}
2291
e26d99ae 2292/**
febe562c
NB		 2293 * transport_put_cmd - release a reference to a command
2294 * @cmd: command to release
e26d99ae 2295 *
febe562c 2296 * This routine releases our reference to the command and frees it if possible.
e26d99ae 2297 */
febe562c 2298static int transport_put_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2299{
2300 BUG_ON(!cmd->se_tfo);
e26d99ae 2301 /*
7481deb4
NB		 2302 * If this cmd has been setup with target_get_sess_cmd(), drop
2303 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2304 */
afc16604 2305 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2306}
2307
4949314c 2308void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2309{
ec98f782 2310 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2311 struct page **pages;
2312 int i;
05d1c7c0
AG		 2313
2314 /*
ec98f782
AG		 2315 * We need to take into account a possible offset here for fabrics like
2316 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2317 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2318 */
4949314c
AG		 2319 if (!cmd->t_data_nents)
2320 return NULL;
3717ef0c
PB		 2321
2322 BUG_ON(!sg);
2323 if (cmd->t_data_nents == 1)
4949314c
AG		 2324 return kmap(sg_page(sg)) + sg->offset;
2325
2326 /* >1 page. use vmap */
df6751f3 2327 pages = kmalloc_array(cmd->t_data_nents, sizeof(*pages), GFP_KERNEL);
de103c93 2328 if (!pages)
4949314c
AG		 2329 return NULL;
2330
2331 /* convert sg[] to pages[] */
2332 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2333 pages[i] = sg_page(sg);
2334 }
2335
2336 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2337 kfree(pages);
de103c93 2338 if (!cmd->t_data_vmap)
4949314c
AG		 2339 return NULL;
2340
2341 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2342}
4949314c 2343EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2344
4949314c 2345void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2346{
a1edf9cf 2347 if (!cmd->t_data_nents) {
4949314c 2348 return;
a1edf9cf 2349 } else if (cmd->t_data_nents == 1) {
4949314c 2350 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2351 return;
2352 }
4949314c
AG		 2353
2354 vunmap(cmd->t_data_vmap);
2355 cmd->t_data_vmap = NULL;
05d1c7c0 2356}
4949314c 2357EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2358
c5ff8d6b 2359int
20093994 2360target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
e64aa657 2361 bool zero_page, bool chainable)
c66ac9db 2362{
20093994 2363 struct scatterlist *sg;
ec98f782 2364 struct page *page;
20093994 2365 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
e64aa657 2366 unsigned int nalloc, nent;
ec98f782 2367 int i = 0;
c66ac9db 2368
e64aa657
CH		 2369 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2370 if (chainable)
2371 nalloc++;
2372 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
20093994 2373 if (!sg)
ec98f782 2374 return -ENOMEM;
c66ac9db 2375
e64aa657 2376 sg_init_table(sg, nalloc);
9db9da33 2377
ec98f782
AG		 2378 while (length) {
2379 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2380 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2381 if (!page)
2382 goto out;
c66ac9db 2383
20093994 2384 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2385 length -= page_len;
2386 i++;
c66ac9db 2387 }
20093994
NB		 2388 *sgl = sg;
2389 *nents = nent;
c66ac9db 2390 return 0;
c66ac9db 2391
ec98f782 2392out:
d0e27c88 2393 while (i > 0) {
ec98f782 2394 i--;
20093994 2395 __free_page(sg_page(&sg[i]));
c66ac9db 2396 }
20093994 2397 kfree(sg);
ec98f782 2398 return -ENOMEM;
c66ac9db 2399}
e64aa657 2400EXPORT_SYMBOL(target_alloc_sgl);
c66ac9db 2401
da0f7619 2402/*
b16a35b0
AG		 2403 * Allocate any required resources to execute the command. For writes we
2404 * might not have the payload yet, so notify the fabric via a call to
2405 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2406 */
de103c93
CH		 2407sense_reason_t
2408transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2409{
b1a2ecda 2410 unsigned long flags;
c66ac9db 2411 int ret = 0;
c8e63985 2412 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2413
5835812f
AM		 2414 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2415 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2416 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
e64aa657 2417 cmd->prot_length, true, false);
5835812f
AM		 2418 if (ret < 0)
2419 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2420 }
2421
c66ac9db
NB		 2422 /*
2423 * Determine is the TCM fabric module has already allocated physical
2424 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2425 * beforehand.
c66ac9db 2426 */
ec98f782
AG		 2427 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2428 cmd->data_length) {
20093994 2429
8cefe07b
NB		 2430 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2431 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2432 u32 bidi_length;
2433
2434 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2435 bidi_length = cmd->t_task_nolb *
2436 cmd->se_dev->dev_attrib.block_size;
2437 else
2438 bidi_length = cmd->data_length;
2439
2440 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2441 &cmd->t_bidi_data_nents,
e64aa657 2442 bidi_length, zero_flag, false);
8cefe07b
NB		 2443 if (ret < 0)
2444 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2445 }
2446
20093994 2447 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
e64aa657 2448 cmd->data_length, zero_flag, false);
c66ac9db 2449 if (ret < 0)
de103c93 2450 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2451 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2452 cmd->data_length) {
2453 /*
2454 * Special case for COMPARE_AND_WRITE with fabrics
2455 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2456 */
2457 u32 caw_length = cmd->t_task_nolb *
2458 cmd->se_dev->dev_attrib.block_size;
2459
2460 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2461 &cmd->t_bidi_data_nents,
e64aa657 2462 caw_length, zero_flag, false);
c8e63985
NB		 2463 if (ret < 0)
2464 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2465 }
c66ac9db 2466 /*
c3196f0c
CH		 2467 * If this command is not a write we can execute it right here,
2468 * for write buffers we need to notify the fabric driver first
2469 * and let it call back once the write buffers are ready.
c66ac9db 2470 */
5f41a31d 2471 target_add_to_state_list(cmd);
885e7b0e 2472 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2473 target_execute_cmd(cmd);
2474 return 0;
2475 }
b1a2ecda
BVA		 2476
2477 spin_lock_irqsave(&cmd->t_state_lock, flags);
2478 cmd->t_state = TRANSPORT_WRITE_PENDING;
2479 /*
2480 * Determine if frontend context caller is requesting the stopping of
2481 * this command for frontend exceptions.
2482 */
2483 if (cmd->transport_state & CMD_T_STOP) {
2484 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
2485 __func__, __LINE__, cmd->tag);
2486
2487 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2488
2489 complete_all(&cmd->t_transport_stop_comp);
a5eb307f 2490 return 0;
b1a2ecda
BVA		 2491 }
2492 cmd->transport_state &= ~CMD_T_ACTIVE;
2493 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c3196f0c
CH		 2494
2495 ret = cmd->se_tfo->write_pending(cmd);
fa7e25cf 2496 if (ret)
c3196f0c
CH		 2497 goto queue_full;
2498
fa7e25cf 2499 return 0;
da0f7619 2500
c3196f0c
CH		 2501queue_full:
2502 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
fa7e25cf 2503 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
c3196f0c 2504 return 0;
c66ac9db 2505}
a1d8b49a 2506EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2507
e057f533 2508static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2509{
f147abb4
NB		 2510 int ret;
2511
2512 ret = cmd->se_tfo->write_pending(cmd);
fa7e25cf 2513 if (ret) {
e057f533
CH		 2514 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2515 cmd);
fa7e25cf 2516 transport_handle_queue_full(cmd, cmd->se_dev, ret, true);
e057f533 2517 }
07bde79a
NB		 2518}
2519
0f4a9431
NB		 2520static bool
2521__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2522 unsigned long *flags);
2523
2524static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2525{
2526 unsigned long flags;
2527
2528 spin_lock_irqsave(&cmd->t_state_lock, flags);
2529 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2530 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2531}
2532
d5ddad41 2533int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2534{
d5ddad41 2535 int ret = 0;
0f4a9431 2536 bool aborted = false, tas = false;
d5ddad41 2537
d14921d6 2538 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2539 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2540 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2541
0f4a9431
NB		 2542 if (!aborted || tas)
2543 ret = transport_put_cmd(cmd);
d14921d6
NB		 2544 } else {
2545 if (wait_for_tasks)
0f4a9431 2546 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2547 /*
2548 * Handle WRITE failure case where transport_generic_new_cmd()
2549 * has already added se_cmd to state_list, but fabric has
2550 * failed command before I/O submission.
2551 */
febe562c 2552 if (cmd->state_active)
c130480b 2553 target_remove_from_state_list(cmd);
d14921d6 2554
82f1c8a4 2555 if (cmd->se_lun)
c66ac9db 2556 transport_lun_remove_cmd(cmd);
c66ac9db 2557
0f4a9431
NB		 2558 if (!aborted || tas)
2559 ret = transport_put_cmd(cmd);
2560 }
2561 /*
2562 * If the task has been internally aborted due to TMR ABORT_TASK
2563 * or LUN_RESET, target_core_tmr.c is responsible for performing
2564 * the remaining calls to target_put_sess_cmd(), and not the
2565 * callers of this function.
2566 */
2567 if (aborted) {
2568 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2569 wait_for_completion(&cmd->cmd_wait_comp);
2570 cmd->se_tfo->release_cmd(cmd);
2571 ret = 1;
c66ac9db 2572 }
d5ddad41 2573 return ret;
c66ac9db
NB		 2574}
2575EXPORT_SYMBOL(transport_generic_free_cmd);
2576
a17f091d 2577/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2578 * @se_cmd: command descriptor to add
a6360785 2579 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2580 */
afc16604 2581int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2582{
afc16604 2583 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2584 unsigned long flags;
bc187ea6 2585 int ret = 0;
a17f091d 2586
a6360785
NB		 2587 /*
2588 * Add a second kref if the fabric caller is expecting to handle
2589 * fabric acknowledgement that requires two target_put_sess_cmd()
2590 * invocations before se_cmd descriptor release.
2591 */
527268df 2592 if (ack_kref) {
1b4c59b7
HR		 2593 if (!kref_get_unless_zero(&se_cmd->cmd_kref))
2594 return -EINVAL;
2595
527268df
NB		 2596 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2597 }
7481deb4 2598
a17f091d 2599 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2600 if (se_sess->sess_tearing_down) {
2601 ret = -ESHUTDOWN;
2602 goto out;
2603 }
a17f091d 2604 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2605out:
a17f091d 2606 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2607
2608 if (ret && ack_kref)
afc16604 2609 target_put_sess_cmd(se_cmd);
7544e597 2610
bc187ea6 2611 return ret;
a17f091d 2612}
20361e69 2613EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2614
febe562c
NB		 2615static void target_free_cmd_mem(struct se_cmd *cmd)
2616{
2617 transport_free_pages(cmd);
2618
2619 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2620 core_tmr_release_req(cmd->se_tmr_req);
2621 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2622 kfree(cmd->t_task_cdb);
2623}
2624
7481deb4 2625static void target_release_cmd_kref(struct kref *kref)
a17f091d 2626{
7481deb4
NB		 2627 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2628 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2629 unsigned long flags;
0f4a9431 2630 bool fabric_stop;
a17f091d 2631
6b6427b6
BVA		 2632 if (se_sess) {
2633 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2634
2635 spin_lock(&se_cmd->t_state_lock);
2636 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2637 (se_cmd->transport_state & CMD_T_ABORTED);
2638 spin_unlock(&se_cmd->t_state_lock);
2639
2640 if (se_cmd->cmd_wait_set || fabric_stop) {
2641 list_del_init(&se_cmd->se_cmd_list);
2642 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2643 target_free_cmd_mem(se_cmd);
2644 complete(&se_cmd->cmd_wait_comp);
2645 return;
2646 }
0f4a9431 2647 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2648 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2649 }
a17f091d 2650
febe562c 2651 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2652 se_cmd->se_tfo->release_cmd(se_cmd);
2653}
2654
6b6427b6
BVA		 2655/**
2656 * target_put_sess_cmd - decrease the command reference count
2657 * @se_cmd: command to drop a reference from
2658 *
2659 * Returns 1 if and only if this target_put_sess_cmd() call caused the
2660 * refcount to drop to zero. Returns zero otherwise.
7481deb4 2661 */
afc16604 2662int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2663{
9ff9d15e 2664 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2665}
2666EXPORT_SYMBOL(target_put_sess_cmd);
2667
1c7b13fe
RD		 2668/* target_sess_cmd_list_set_waiting - Flag all commands in
2669 * sess_cmd_list to complete cmd_wait_comp. Set
2670 * sess_tearing_down so no more commands are queued.
2671 * @se_sess: session to flag
a17f091d 2672 */
1c7b13fe 2673void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d 2674{
1b4c59b7 2675 struct se_cmd *se_cmd, *tmp_cmd;
a17f091d 2676 unsigned long flags;
0f4a9431 2677 int rc;
a17f091d 2678
a17f091d 2679 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2680 if (se_sess->sess_tearing_down) {
2681 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2682 return;
2683 }
1c7b13fe 2684 se_sess->sess_tearing_down = 1;
9b31a328 2685 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2686
1b4c59b7
HR		 2687 list_for_each_entry_safe(se_cmd, tmp_cmd,
2688 &se_sess->sess_wait_list, se_cmd_list) {
0f4a9431
NB		 2689 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2690 if (rc) {
2691 se_cmd->cmd_wait_set = 1;
2692 spin_lock(&se_cmd->t_state_lock);
2693 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2694 spin_unlock(&se_cmd->t_state_lock);
1b4c59b7
HR		 2695 } else
2696 list_del_init(&se_cmd->se_cmd_list);
0f4a9431 2697 }
a17f091d
NB		 2698
2699 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2700}
1c7b13fe 2701EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2702
2703/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2704 * @se_sess: session to wait for active I/O
a17f091d 2705 */
be646c2d 2706void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2707{
2708 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2709 unsigned long flags;
0f4a9431 2710 bool tas;
a17f091d
NB		 2711
2712 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2713 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2714 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2715 " %d\n", se_cmd, se_cmd->t_state,
2716 se_cmd->se_tfo->get_cmd_state(se_cmd));
2717
0f4a9431
NB		 2718 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2719 tas = (se_cmd->transport_state & CMD_T_TAS);
2720 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2721
2722 if (!target_put_sess_cmd(se_cmd)) {
2723 if (tas)
2724 target_put_sess_cmd(se_cmd);
2725 }
2726
be646c2d
JE		 2727 wait_for_completion(&se_cmd->cmd_wait_comp);
2728 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2729 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2730 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2731
2732 se_cmd->se_tfo->release_cmd(se_cmd);
2733 }
9b31a328
NB		 2734
2735 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2736 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2737 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2738
a17f091d
NB		 2739}
2740EXPORT_SYMBOL(target_wait_for_sess_cmds);
2741
bd4e2d29
NB		 2742static void target_lun_confirm(struct percpu_ref *ref)
2743{
2744 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
2745
2746 complete(&lun->lun_ref_comp);
2747}
2748
b3eeea66 2749void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2750{
bd4e2d29
NB		 2751 /*
2752 * Mark the percpu-ref as DEAD, switch to atomic_t mode, drop
2753 * the initial reference and schedule confirm kill to be
2754 * executed after one full RCU grace period has completed.
2755 */
2756 percpu_ref_kill_and_confirm(&lun->lun_ref, target_lun_confirm);
2757 /*
2758 * The first completion waits for percpu_ref_switch_to_atomic_rcu()
2759 * to call target_lun_confirm after lun->lun_ref has been marked
2760 * as __PERCPU_REF_DEAD on all CPUs, and switches to atomic_t
2761 * mode so that percpu_ref_tryget_live() lookup of lun->lun_ref
2762 * fails for all new incoming I/O.
2763 */
5277797d 2764 wait_for_completion(&lun->lun_ref_comp);
bd4e2d29
NB		 2765 /*
2766 * The second completion waits for percpu_ref_put_many() to
2767 * invoke ->release() after lun->lun_ref has switched to
2768 * atomic_t mode, and lun->lun_ref.count has reached zero.
2769 *
2770 * At this point all target-core lun->lun_ref references have
2771 * been dropped via transport_lun_remove_cmd(), and it's safe
2772 * to proceed with the remaining LUN shutdown.
2773 */
2774 wait_for_completion(&lun->lun_shutdown_comp);
c66ac9db
NB		 2775}
2776
0f4a9431
NB		 2777static bool
2778__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2779 bool *aborted, bool *tas, unsigned long *flags)
2780 __releases(&cmd->t_state_lock)
2781 __acquires(&cmd->t_state_lock)
c66ac9db 2782{
c66ac9db 2783
0f4a9431
NB		 2784 assert_spin_locked(&cmd->t_state_lock);
2785 WARN_ON_ONCE(!irqs_disabled());
2786
2787 if (fabric_stop)
2788 cmd->transport_state |= CMD_T_FABRIC_STOP;
2789
2790 if (cmd->transport_state & CMD_T_ABORTED)
2791 *aborted = true;
2792
2793 if (cmd->transport_state & CMD_T_TAS)
2794 *tas = true;
2795
c8e31f26 2796 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2797 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2798 return false;
cb4f4d3c 2799
c8e31f26 2800 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2801 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2802 return false;
7d680f3b 2803
0f4a9431
NB		 2804 if (!(cmd->transport_state & CMD_T_ACTIVE))
2805 return false;
2806
2807 if (fabric_stop && *aborted)
a17f091d 2808 return false;
c66ac9db 2809
7d680f3b 2810 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2811
0f4a9431
NB		 2812 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2813 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2814 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2815
0f4a9431 2816 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2817
a1d8b49a 2818 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2819
0f4a9431 2820 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2821 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2822
0f4a9431
NB		 2823 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2824 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2825
0f4a9431
NB		 2826 return true;
2827}
2828
2829/**
2d4760ee
BVA		 2830 * transport_wait_for_tasks - set CMD_T_STOP and wait for t_transport_stop_comp
2831 * @cmd: command to wait on
0f4a9431
NB		 2832 */
2833bool transport_wait_for_tasks(struct se_cmd *cmd)
2834{
2835 unsigned long flags;
2836 bool ret, aborted = false, tas = false;
2837
2838 spin_lock_irqsave(&cmd->t_state_lock, flags);
2839 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 2840 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2841
0f4a9431 2842 return ret;
c66ac9db 2843}
d14921d6 2844EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2845
ab78fef4
BVA		 2846struct sense_info {
2847 u8 key;
2848 u8 asc;
2849 u8 ascq;
2850 bool add_sector_info;
2851};
2852
2853static const struct sense_info sense_info_table[] = {
2854 [TCM_NO_SENSE] = {
2855 .key = NOT_READY
2856 },
2857 [TCM_NON_EXISTENT_LUN] = {
2858 .key = ILLEGAL_REQUEST,
2859 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2860 },
2861 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2862 .key = ILLEGAL_REQUEST,
2863 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2864 },
2865 [TCM_SECTOR_COUNT_TOO_MANY] = {
2866 .key = ILLEGAL_REQUEST,
2867 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2868 },
2869 [TCM_UNKNOWN_MODE_PAGE] = {
2870 .key = ILLEGAL_REQUEST,
2871 .asc = 0x24, /* INVALID FIELD IN CDB */
2872 },
2873 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2874 .key = ABORTED_COMMAND,
2875 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2876 .ascq = 0x03,
2877 },
2878 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2879 .key = ABORTED_COMMAND,
2880 .asc = 0x0c, /* WRITE ERROR */
2881 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2882 },
2883 [TCM_INVALID_CDB_FIELD] = {
2884 .key = ILLEGAL_REQUEST,
2885 .asc = 0x24, /* INVALID FIELD IN CDB */
2886 },
2887 [TCM_INVALID_PARAMETER_LIST] = {
2888 .key = ILLEGAL_REQUEST,
2889 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2890 },
e8642120
DD		 2891 [TCM_TOO_MANY_TARGET_DESCS] = {
2892 .key = ILLEGAL_REQUEST,
2893 .asc = 0x26,
2894 .ascq = 0x06, /* TOO MANY TARGET DESCRIPTORS */
2895 },
2896 [TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE] = {
2897 .key = ILLEGAL_REQUEST,
2898 .asc = 0x26,
2899 .ascq = 0x07, /* UNSUPPORTED TARGET DESCRIPTOR TYPE CODE */
2900 },
2901 [TCM_TOO_MANY_SEGMENT_DESCS] = {
2902 .key = ILLEGAL_REQUEST,
2903 .asc = 0x26,
2904 .ascq = 0x08, /* TOO MANY SEGMENT DESCRIPTORS */
2905 },
2906 [TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE] = {
2907 .key = ILLEGAL_REQUEST,
2908 .asc = 0x26,
2909 .ascq = 0x09, /* UNSUPPORTED SEGMENT DESCRIPTOR TYPE CODE */
2910 },
ab78fef4
BVA		 2911 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2912 .key = ILLEGAL_REQUEST,
2913 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2914 },
2915 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2916 .key = ILLEGAL_REQUEST,
2917 .asc = 0x0c, /* WRITE ERROR */
2918 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2919 },
2920 [TCM_SERVICE_CRC_ERROR] = {
2921 .key = ABORTED_COMMAND,
2922 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2923 .ascq = 0x05, /* N/A */
2924 },
2925 [TCM_SNACK_REJECTED] = {
2926 .key = ABORTED_COMMAND,
2927 .asc = 0x11, /* READ ERROR */
2928 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2929 },
2930 [TCM_WRITE_PROTECTED] = {
2931 .key = DATA_PROTECT,
2932 .asc = 0x27, /* WRITE PROTECTED */
2933 },
2934 [TCM_ADDRESS_OUT_OF_RANGE] = {
2935 .key = ILLEGAL_REQUEST,
2936 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2937 },
2938 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2939 .key = UNIT_ATTENTION,
2940 },
2941 [TCM_CHECK_CONDITION_NOT_READY] = {
2942 .key = NOT_READY,
2943 },
2944 [TCM_MISCOMPARE_VERIFY] = {
2945 .key = MISCOMPARE,
2946 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2947 .ascq = 0x00,
2948 },
2949 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2950 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2951 .asc = 0x10,
2952 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2953 .add_sector_info = true,
2954 },
2955 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2956 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2957 .asc = 0x10,
2958 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2959 .add_sector_info = true,
2960 },
2961 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2962 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2963 .asc = 0x10,
2964 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2965 .add_sector_info = true,
2966 },
449a1378
NB		 2967 [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = {
2968 .key = COPY_ABORTED,
2969 .asc = 0x0d,
2970 .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */
2971
2972 },
ab78fef4
BVA		 2973 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2974 /*
2975 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2976 * Solaris initiators. Returning NOT READY instead means the
2977 * operations will be retried a finite number of times and we
2978 * can survive intermittent errors.
2979 */
2980 .key = NOT_READY,
2981 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2982 },
2983};
2984
f5a8b3a7 2985static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2986{
2987 const struct sense_info *si;
2988 u8 *buffer = cmd->sense_buffer;
2989 int r = (__force int)reason;
2990 u8 asc, ascq;
4e4937e8 2991 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2992
2993 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2994 si = &sense_info_table[r];
2995 else
2996 si = &sense_info_table[(__force int)
2997 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2998
ab78fef4
BVA		 2999 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
3000 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3001 WARN_ON_ONCE(asc == 0);
3002 } else if (si->asc == 0) {
3003 WARN_ON_ONCE(cmd->scsi_asc == 0);
3004 asc = cmd->scsi_asc;
3005 ascq = cmd->scsi_ascq;
3006 } else {
3007 asc = si->asc;
3008 ascq = si->ascq;
3009 }
9ec1e1ce 3010
4e4937e8 3011 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 3012 if (si->add_sector_info)
f5a8b3a7
SG		 3013 return scsi_set_sense_information(buffer,
3014 cmd->scsi_sense_length,
3015 cmd->bad_sector);
3016
3017 return 0;
ab78fef4
BVA		 3018}
3019
de103c93
CH		 3020int
3021transport_send_check_condition_and_sense(struct se_cmd *cmd,
3022 sense_reason_t reason, int from_transport)
c66ac9db 3023{
c66ac9db 3024 unsigned long flags;
c66ac9db 3025
a1d8b49a 3026 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3027 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 3028 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3029 return 0;
3030 }
3031 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 3032 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3033
ab78fef4 3034 if (!from_transport) {
f5a8b3a7
SG		 3035 int rc;
3036
c66ac9db 3037 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 3038 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3039 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 3040 rc = translate_sense_reason(cmd, reason);
3041 if (rc)
3042 return rc;
c66ac9db 3043 }
c66ac9db 3044
e5c0d6ad 3045 trace_target_cmd_complete(cmd);
07bde79a 3046 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3047}
3048EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3049
310d3d31
NB		 3050static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3051 __releases(&cmd->t_state_lock)
3052 __acquires(&cmd->t_state_lock)
c66ac9db 3053{
fa7e25cf
NB		 3054 int ret;
3055
310d3d31
NB		 3056 assert_spin_locked(&cmd->t_state_lock);
3057 WARN_ON_ONCE(!irqs_disabled());
3058
c18bc7d8
RD		 3059 if (!(cmd->transport_state & CMD_T_ABORTED))
3060 return 0;
68259b5a
AL		 3061 /*
3062 * If cmd has been aborted but either no status is to be sent or it has
3063 * already been sent, just return
3064 */
310d3d31
NB		 3065 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
3066 if (send_status)
3067 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 3068 return 1;
310d3d31 3069 }
8b1e1244 3070
310d3d31
NB		 3071 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
3072 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3073
68259b5a 3074 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 3075 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 3076 trace_target_cmd_complete(cmd);
310d3d31
NB		 3077
3078 spin_unlock_irq(&cmd->t_state_lock);
fa7e25cf
NB		 3079 ret = cmd->se_tfo->queue_status(cmd);
3080 if (ret)
3081 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
310d3d31 3082 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 3083
3084 return 1;
c66ac9db 3085}
310d3d31
NB		 3086
3087int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3088{
3089 int ret;
3090
3091 spin_lock_irq(&cmd->t_state_lock);
3092 ret = __transport_check_aborted_status(cmd, send_status);
3093 spin_unlock_irq(&cmd->t_state_lock);
3094
3095 return ret;
3096}
c66ac9db
NB		 3097EXPORT_SYMBOL(transport_check_aborted_status);
3098
3099void transport_send_task_abort(struct se_cmd *cmd)
3100{
c252f003 3101 unsigned long flags;
fa7e25cf 3102 int ret;
c252f003
NB		 3103
3104 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 3105 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 3106 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3107 return;
3108 }
3109 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3110
c66ac9db
NB		 3111 /*
3112 * If there are still expected incoming fabric WRITEs, we wait
3113 * until until they have completed before sending a TASK_ABORTED
3114 * response. This response with TASK_ABORTED status will be
3115 * queued back to fabric module by transport_check_aborted_status().
3116 */
3117 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3118 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 3119 spin_lock_irqsave(&cmd->t_state_lock, flags);
3120 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3121 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3122 goto send_abort;
3123 }
68259b5a 3124 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 3125 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 3126 return;
c66ac9db
NB		 3127 }
3128 }
310d3d31 3129send_abort:
c66ac9db 3130 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3131
72b59d6e
RD		 3132 transport_lun_remove_cmd(cmd);
3133
649ee054
BVA		 3134 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3135 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3136
e5c0d6ad 3137 trace_target_cmd_complete(cmd);
fa7e25cf
NB		 3138 ret = cmd->se_tfo->queue_status(cmd);
3139 if (ret)
3140 transport_handle_queue_full(cmd, cmd->se_dev, ret, false);
c66ac9db
NB		 3141}
3142
af877292 3143static void target_tmr_work(struct work_struct *work)
c66ac9db 3144{
af877292 3145 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3146 struct se_device *dev = cmd->se_dev;
c66ac9db 3147 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 3148 unsigned long flags;
c66ac9db
NB		 3149 int ret;
3150
a6d9bb1c
NB		 3151 spin_lock_irqsave(&cmd->t_state_lock, flags);
3152 if (cmd->transport_state & CMD_T_ABORTED) {
3153 tmr->response = TMR_FUNCTION_REJECTED;
3154 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3155 goto check_stop;
3156 }
3157 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3158
c66ac9db 3159 switch (tmr->function) {
5c6cd613 3160 case TMR_ABORT_TASK:
3d28934a 3161 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3162 break;
5c6cd613
NB		 3163 case TMR_ABORT_TASK_SET:
3164 case TMR_CLEAR_ACA:
3165 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3166 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3167 break;
5c6cd613 3168 case TMR_LUN_RESET:
c66ac9db
NB		 3169 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3170 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3171 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3172 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3173 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3174 cmd->orig_fe_lun, 0x29,
3175 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3176 }
c66ac9db 3177 break;
5c6cd613 3178 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3179 tmr->response = TMR_FUNCTION_REJECTED;
3180 break;
5c6cd613 3181 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3182 tmr->response = TMR_FUNCTION_REJECTED;
3183 break;
c66ac9db 3184 default:
6708bb27 3185 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3186 tmr->function);
3187 tmr->response = TMR_FUNCTION_REJECTED;
3188 break;
3189 }
3190
a6d9bb1c
NB		 3191 spin_lock_irqsave(&cmd->t_state_lock, flags);
3192 if (cmd->transport_state & CMD_T_ABORTED) {
3193 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3194 goto check_stop;
3195 }
a6d9bb1c
NB		 3196 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3197
e3d6f909 3198 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3199
a6d9bb1c 3200check_stop:
b7b8bef7 3201 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3202}
3203
af877292
CH		 3204int transport_generic_handle_tmr(
3205 struct se_cmd *cmd)
c66ac9db 3206{
f15e9cd9 3207 unsigned long flags;
c54eeffb 3208 bool aborted = false;
f15e9cd9
NB		 3209
3210 spin_lock_irqsave(&cmd->t_state_lock, flags);
c54eeffb
NB		 3211 if (cmd->transport_state & CMD_T_ABORTED) {
3212 aborted = true;
3213 } else {
3214 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3215 cmd->transport_state |= CMD_T_ACTIVE;
3216 }
f15e9cd9
NB		 3217 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3218
c54eeffb
NB		 3219 if (aborted) {
3220 pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
3221 "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
3222 cmd->se_tmr_req->ref_task_tag, cmd->tag);
3223 transport_cmd_check_stop_to_fabric(cmd);
3224 return 0;
3225 }
3226
af877292
CH		 3227 INIT_WORK(&cmd->work, target_tmr_work);
3228 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3229 return 0;
3230}
af877292 3231EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3232
3233bool
3234target_check_wce(struct se_device *dev)
3235{
3236 bool wce = false;
3237
3238 if (dev->transport->get_write_cache)
3239 wce = dev->transport->get_write_cache(dev);
3240 else if (dev->dev_attrib.emulate_write_cache > 0)
3241 wce = true;
3242
3243 return wce;
3244}
3245
3246bool
3247target_check_fua(struct se_device *dev)
3248{
3249 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3250}
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