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Merge tag 'stable/for-linus-3.15-rc1-tag' of git://git.kernel.org/pub/scm/linux/kerne...
[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
c66ac9db
NB		 37#include <asm/unaligned.h>
38#include <net/sock.h>
39#include <net/tcp.h>
40#include <scsi/scsi.h>
41#include <scsi/scsi_cmnd.h>
e66ecd50 42#include <scsi/scsi_tcq.h>
c66ac9db
NB		 43
44#include <target/target_core_base.h>
c4795fb2
CH		 45#include <target/target_core_backend.h>
46#include <target/target_core_fabric.h>
c66ac9db
NB		 47#include <target/target_core_configfs.h>
48
e26d99ae 49#include "target_core_internal.h"
c66ac9db 50#include "target_core_alua.h"
c66ac9db 51#include "target_core_pr.h"
c66ac9db
NB		 52#include "target_core_ua.h"
53
e5c0d6ad
RD		 54#define CREATE_TRACE_POINTS
55#include <trace/events/target.h>
56
35e0e757 57static struct workqueue_struct *target_completion_wq;
c66ac9db 58static struct kmem_cache *se_sess_cache;
c66ac9db 59struct kmem_cache *se_ua_cache;
c66ac9db
NB		 60struct kmem_cache *t10_pr_reg_cache;
61struct kmem_cache *t10_alua_lu_gp_cache;
62struct kmem_cache *t10_alua_lu_gp_mem_cache;
63struct kmem_cache *t10_alua_tg_pt_gp_cache;
64struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
229d4f11
HR		 65struct kmem_cache *t10_alua_lba_map_cache;
66struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 67
c66ac9db 68static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 69static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 70 struct se_device *dev);
d5ddad41 71static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 72static void target_complete_ok_work(struct work_struct *work);
c66ac9db 73
e3d6f909 74int init_se_kmem_caches(void)
c66ac9db 75{
c66ac9db
NB		 76 se_sess_cache = kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session), __alignof__(struct se_session),
78 0, NULL);
6708bb27
AG		 79 if (!se_sess_cache) {
80 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 81 " failed\n");
c8e31f26 82 goto out;
c66ac9db
NB		 83 }
84 se_ua_cache = kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua), __alignof__(struct se_ua),
86 0, NULL);
6708bb27
AG		 87 if (!se_ua_cache) {
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 89 goto out_free_sess_cache;
c66ac9db 90 }
c66ac9db
NB		 91 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration),
93 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 94 if (!t10_pr_reg_cache) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 96 " failed\n");
35e0e757 97 goto out_free_ua_cache;
c66ac9db
NB		 98 }
99 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
101 0, NULL);
6708bb27
AG		 102 if (!t10_alua_lu_gp_cache) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 104 " failed\n");
35e0e757 105 goto out_free_pr_reg_cache;
c66ac9db
NB		 106 }
107 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member),
109 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 110 if (!t10_alua_lu_gp_mem_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 112 "cache failed\n");
35e0e757 113 goto out_free_lu_gp_cache;
c66ac9db
NB		 114 }
115 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp),
117 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 118 if (!t10_alua_tg_pt_gp_cache) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 120 "cache failed\n");
35e0e757 121 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 122 }
123 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member),
126 __alignof__(struct t10_alua_tg_pt_gp_member),
127 0, NULL);
6708bb27
AG		 128 if (!t10_alua_tg_pt_gp_mem_cache) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 130 "mem_t failed\n");
35e0e757 131 goto out_free_tg_pt_gp_cache;
c66ac9db 132 }
229d4f11
HR		 133 t10_alua_lba_map_cache = kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map),
136 __alignof__(struct t10_alua_lba_map), 0, NULL);
137 if (!t10_alua_lba_map_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
139 "cache failed\n");
140 goto out_free_tg_pt_gp_mem_cache;
141 }
142 t10_alua_lba_map_mem_cache = kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member),
145 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
146 if (!t10_alua_lba_map_mem_cache) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
148 "cache failed\n");
149 goto out_free_lba_map_cache;
150 }
c66ac9db 151
35e0e757
CH		 152 target_completion_wq = alloc_workqueue("target_completion",
153 WQ_MEM_RECLAIM, 0);
154 if (!target_completion_wq)
229d4f11 155 goto out_free_lba_map_mem_cache;
35e0e757 156
c66ac9db 157 return 0;
35e0e757 158
229d4f11
HR		 159out_free_lba_map_mem_cache:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
161out_free_lba_map_cache:
162 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 163out_free_tg_pt_gp_mem_cache:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
165out_free_tg_pt_gp_cache:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167out_free_lu_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169out_free_lu_gp_cache:
170 kmem_cache_destroy(t10_alua_lu_gp_cache);
171out_free_pr_reg_cache:
172 kmem_cache_destroy(t10_pr_reg_cache);
173out_free_ua_cache:
174 kmem_cache_destroy(se_ua_cache);
175out_free_sess_cache:
176 kmem_cache_destroy(se_sess_cache);
c66ac9db 177out:
e3d6f909 178 return -ENOMEM;
c66ac9db
NB		 179}
180
e3d6f909 181void release_se_kmem_caches(void)
c66ac9db 182{
35e0e757 183 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 184 kmem_cache_destroy(se_sess_cache);
185 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 186 kmem_cache_destroy(t10_pr_reg_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_cache);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
229d4f11
HR		 191 kmem_cache_destroy(t10_alua_lba_map_cache);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 193}
194
e3d6f909
AG		 195/* This code ensures unique mib indexes are handed out. */
196static DEFINE_SPINLOCK(scsi_mib_index_lock);
197static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 198
199/*
200 * Allocate a new row index for the entry type specified
201 */
202u32 scsi_get_new_index(scsi_index_t type)
203{
204 u32 new_index;
205
e3d6f909 206 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 207
e3d6f909
AG		 208 spin_lock(&scsi_mib_index_lock);
209 new_index = ++scsi_mib_index[type];
210 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 211
212 return new_index;
213}
214
dbc5623e 215void transport_subsystem_check_init(void)
c66ac9db
NB		 216{
217 int ret;
283669d2 218 static int sub_api_initialized;
c66ac9db 219
dbc5623e
NB		 220 if (sub_api_initialized)
221 return;
222
c66ac9db
NB		 223 ret = request_module("target_core_iblock");
224 if (ret != 0)
6708bb27 225 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 226
227 ret = request_module("target_core_file");
228 if (ret != 0)
6708bb27 229 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 230
231 ret = request_module("target_core_pscsi");
232 if (ret != 0)
6708bb27 233 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 234
e3d6f909 235 sub_api_initialized = 1;
c66ac9db
NB		 236}
237
e70beee7 238struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 239{
240 struct se_session *se_sess;
241
242 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 243 if (!se_sess) {
244 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 245 " se_sess_cache\n");
246 return ERR_PTR(-ENOMEM);
247 }
248 INIT_LIST_HEAD(&se_sess->sess_list);
249 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 250 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 251 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 252 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 253 kref_init(&se_sess->sess_kref);
e70beee7 254 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 255
256 return se_sess;
257}
258EXPORT_SYMBOL(transport_init_session);
259
c0add7fd
NB		 260int transport_alloc_session_tags(struct se_session *se_sess,
261 unsigned int tag_num, unsigned int tag_size)
262{
263 int rc;
264
8c7f6e9b
NB		 265 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
266 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 267 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 268 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
269 if (!se_sess->sess_cmd_map) {
270 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
271 return -ENOMEM;
272 }
c0add7fd
NB		 273 }
274
275 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
276 if (rc < 0) {
277 pr_err("Unable to init se_sess->sess_tag_pool,"
278 " tag_num: %u\n", tag_num);
8c7f6e9b
NB		 279 if (is_vmalloc_addr(se_sess->sess_cmd_map))
280 vfree(se_sess->sess_cmd_map);
281 else
282 kfree(se_sess->sess_cmd_map);
c0add7fd
NB		 283 se_sess->sess_cmd_map = NULL;
284 return -ENOMEM;
285 }
286
287 return 0;
288}
289EXPORT_SYMBOL(transport_alloc_session_tags);
290
291struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 292 unsigned int tag_size,
293 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 294{
295 struct se_session *se_sess;
296 int rc;
297
e70beee7 298 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 299 if (IS_ERR(se_sess))
300 return se_sess;
301
302 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
303 if (rc < 0) {
304 transport_free_session(se_sess);
305 return ERR_PTR(-ENOMEM);
306 }
307
308 return se_sess;
309}
310EXPORT_SYMBOL(transport_init_session_tags);
311
c66ac9db 312/*
140854cb 313 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 314 */
315void __transport_register_session(
316 struct se_portal_group *se_tpg,
317 struct se_node_acl *se_nacl,
318 struct se_session *se_sess,
319 void *fabric_sess_ptr)
320{
321 unsigned char buf[PR_REG_ISID_LEN];
322
323 se_sess->se_tpg = se_tpg;
324 se_sess->fabric_sess_ptr = fabric_sess_ptr;
325 /*
326 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
327 *
328 * Only set for struct se_session's that will actually be moving I/O.
329 * eg: *NOT* discovery sessions.
330 */
331 if (se_nacl) {
332 /*
333 * If the fabric module supports an ISID based TransportID,
334 * save this value in binary from the fabric I_T Nexus now.
335 */
e3d6f909 336 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 337 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 338 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 339 &buf[0], PR_REG_ISID_LEN);
340 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
341 }
afb999ff
NB		 342 kref_get(&se_nacl->acl_kref);
343
c66ac9db
NB		 344 spin_lock_irq(&se_nacl->nacl_sess_lock);
345 /*
346 * The se_nacl->nacl_sess pointer will be set to the
347 * last active I_T Nexus for each struct se_node_acl.
348 */
349 se_nacl->nacl_sess = se_sess;
350
351 list_add_tail(&se_sess->sess_acl_list,
352 &se_nacl->acl_sess_list);
353 spin_unlock_irq(&se_nacl->nacl_sess_lock);
354 }
355 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
356
6708bb27 357 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 358 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 359}
360EXPORT_SYMBOL(__transport_register_session);
361
362void transport_register_session(
363 struct se_portal_group *se_tpg,
364 struct se_node_acl *se_nacl,
365 struct se_session *se_sess,
366 void *fabric_sess_ptr)
367{
140854cb
NB		 368 unsigned long flags;
369
370 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 371 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 372 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 373}
374EXPORT_SYMBOL(transport_register_session);
375
ecf0dd66 376static void target_release_session(struct kref *kref)
41ac82b6
NB		 377{
378 struct se_session *se_sess = container_of(kref,
379 struct se_session, sess_kref);
380 struct se_portal_group *se_tpg = se_sess->se_tpg;
381
382 se_tpg->se_tpg_tfo->close_session(se_sess);
383}
384
385void target_get_session(struct se_session *se_sess)
386{
387 kref_get(&se_sess->sess_kref);
388}
389EXPORT_SYMBOL(target_get_session);
390
33933a0e 391void target_put_session(struct se_session *se_sess)
41ac82b6 392{
4149268e
JE		 393 struct se_portal_group *tpg = se_sess->se_tpg;
394
395 if (tpg->se_tpg_tfo->put_session != NULL) {
396 tpg->se_tpg_tfo->put_session(se_sess);
397 return;
398 }
33933a0e 399 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 400}
401EXPORT_SYMBOL(target_put_session);
402
afb999ff
NB		 403static void target_complete_nacl(struct kref *kref)
404{
405 struct se_node_acl *nacl = container_of(kref,
406 struct se_node_acl, acl_kref);
407
408 complete(&nacl->acl_free_comp);
409}
410
411void target_put_nacl(struct se_node_acl *nacl)
412{
413 kref_put(&nacl->acl_kref, target_complete_nacl);
414}
415
c66ac9db
NB		 416void transport_deregister_session_configfs(struct se_session *se_sess)
417{
418 struct se_node_acl *se_nacl;
23388864 419 unsigned long flags;
c66ac9db
NB		 420 /*
421 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
422 */
423 se_nacl = se_sess->se_node_acl;
6708bb27 424 if (se_nacl) {
23388864 425 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 426 if (se_nacl->acl_stop == 0)
427 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 428 /*
429 * If the session list is empty, then clear the pointer.
430 * Otherwise, set the struct se_session pointer from the tail
431 * element of the per struct se_node_acl active session list.
432 */
433 if (list_empty(&se_nacl->acl_sess_list))
434 se_nacl->nacl_sess = NULL;
435 else {
436 se_nacl->nacl_sess = container_of(
437 se_nacl->acl_sess_list.prev,
438 struct se_session, sess_acl_list);
439 }
23388864 440 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 441 }
442}
443EXPORT_SYMBOL(transport_deregister_session_configfs);
444
445void transport_free_session(struct se_session *se_sess)
446{
c0add7fd
NB		 447 if (se_sess->sess_cmd_map) {
448 percpu_ida_destroy(&se_sess->sess_tag_pool);
8c7f6e9b
NB		 449 if (is_vmalloc_addr(se_sess->sess_cmd_map))
450 vfree(se_sess->sess_cmd_map);
451 else
452 kfree(se_sess->sess_cmd_map);
c0add7fd 453 }
c66ac9db
NB		 454 kmem_cache_free(se_sess_cache, se_sess);
455}
456EXPORT_SYMBOL(transport_free_session);
457
458void transport_deregister_session(struct se_session *se_sess)
459{
460 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 461 struct target_core_fabric_ops *se_tfo;
c66ac9db 462 struct se_node_acl *se_nacl;
e63a8e19 463 unsigned long flags;
01468346 464 bool comp_nacl = true;
c66ac9db 465
6708bb27 466 if (!se_tpg) {
c66ac9db
NB		 467 transport_free_session(se_sess);
468 return;
469 }
01468346 470 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 471
e63a8e19 472 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 473 list_del(&se_sess->sess_list);
474 se_sess->se_tpg = NULL;
475 se_sess->fabric_sess_ptr = NULL;
e63a8e19 476 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 477
478 /*
479 * Determine if we need to do extra work for this initiator node's
480 * struct se_node_acl if it had been previously dynamically generated.
481 */
482 se_nacl = se_sess->se_node_acl;
01468346
NB		 483
484 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
485 if (se_nacl && se_nacl->dynamic_node_acl) {
486 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
487 list_del(&se_nacl->acl_list);
488 se_tpg->num_node_acls--;
489 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
490 core_tpg_wait_for_nacl_pr_ref(se_nacl);
491 core_free_device_list_for_node(se_nacl, se_tpg);
492 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
493
494 comp_nacl = false;
495 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 496 }
c66ac9db 497 }
01468346 498 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 499
6708bb27 500 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 501 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 502 /*
125d0119 503 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 504 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
505 * removal context.
01468346
NB		 506 */
507 if (se_nacl && comp_nacl == true)
afb999ff 508 target_put_nacl(se_nacl);
01468346 509
afb999ff 510 transport_free_session(se_sess);
c66ac9db
NB		 511}
512EXPORT_SYMBOL(transport_deregister_session);
513
514/*
a1d8b49a 515 * Called with cmd->t_state_lock held.
c66ac9db 516 */
cf572a96 517static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 518{
42bf829e 519 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 520 unsigned long flags;
521
42bf829e
CH		 522 if (!dev)
523 return;
c66ac9db 524
cf572a96
CH		 525 if (cmd->transport_state & CMD_T_BUSY)
526 return;
c66ac9db 527
cf572a96
CH		 528 spin_lock_irqsave(&dev->execute_task_lock, flags);
529 if (cmd->state_active) {
530 list_del(&cmd->state_list);
cf572a96 531 cmd->state_active = false;
c66ac9db 532 }
cf572a96 533 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 534}
535
862e6389
NB		 536static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
537 bool write_pending)
c66ac9db
NB		 538{
539 unsigned long flags;
540
a1d8b49a 541 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 542 if (write_pending)
543 cmd->t_state = TRANSPORT_WRITE_PENDING;
544
f7113a47
CH		 545 if (remove_from_lists) {
546 target_remove_from_state_list(cmd);
547
548 /*
549 * Clear struct se_cmd->se_lun before the handoff to FE.
550 */
551 cmd->se_lun = NULL;
552 }
553
c66ac9db
NB		 554 /*
555 * Determine if frontend context caller is requesting the stopping of
e3d6f909 556 * this command for frontend exceptions.
c66ac9db 557 */
7d680f3b
CH		 558 if (cmd->transport_state & CMD_T_STOP) {
559 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
560 __func__, __LINE__,
e3d6f909 561 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 562
a1d8b49a 563 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 564
a1d8b49a 565 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 566 return 1;
567 }
f7113a47
CH		 568
569 cmd->transport_state &= ~CMD_T_ACTIVE;
570 if (remove_from_lists) {
571 /*
572 * Some fabric modules like tcm_loop can release
573 * their internally allocated I/O reference now and
574 * struct se_cmd now.
575 *
576 * Fabric modules are expected to return '1' here if the
577 * se_cmd being passed is released at this point,
578 * or zero if not being released.
579 */
580 if (cmd->se_tfo->check_stop_free != NULL) {
581 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
582 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 583 }
f7113a47 584 }
c66ac9db 585
a1d8b49a 586 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 587 return 0;
588}
589
590static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
591{
862e6389 592 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 593}
594
595static void transport_lun_remove_cmd(struct se_cmd *cmd)
596{
e3d6f909 597 struct se_lun *lun = cmd->se_lun;
c66ac9db 598
5259a06e 599 if (!lun)
c66ac9db
NB		 600 return;
601
5259a06e
NB		 602 if (cmpxchg(&cmd->lun_ref_active, true, false))
603 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 604}
605
606void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
607{
68259b5a
AL		 608 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
609 transport_lun_remove_cmd(cmd);
131e6abc
NB		 610 /*
611 * Allow the fabric driver to unmap any resources before
612 * releasing the descriptor via TFO->release_cmd()
613 */
614 if (remove)
615 cmd->se_tfo->aborted_task(cmd);
68259b5a 616
c66ac9db
NB		 617 if (transport_cmd_check_stop_to_fabric(cmd))
618 return;
af877292 619 if (remove)
e6a2573f 620 transport_put_cmd(cmd);
c66ac9db
NB		 621}
622
35e0e757
CH		 623static void target_complete_failure_work(struct work_struct *work)
624{
625 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
626
de103c93
CH		 627 transport_generic_request_failure(cmd,
628 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 629}
630
6138ed2a 631/*
d5829eac
PB		 632 * Used when asking transport to copy Sense Data from the underlying
633 * Linux/SCSI struct scsi_cmnd
6138ed2a 634 */
d5829eac 635static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 636{
6138ed2a 637 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 638
639 WARN_ON(!cmd->se_lun);
640
641 if (!dev)
d5829eac 642 return NULL;
6138ed2a 643
d5829eac
PB		 644 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
645 return NULL;
6138ed2a 646
9c58b7dd 647 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 648
d5829eac 649 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 650 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 651 return cmd->sense_buffer;
6138ed2a
PB		 652}
653
5787cacd 654void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 655{
42bf829e 656 struct se_device *dev = cmd->se_dev;
5787cacd 657 int success = scsi_status == GOOD;
c66ac9db 658 unsigned long flags;
c66ac9db 659
5787cacd
CH		 660 cmd->scsi_status = scsi_status;
661
662
a1d8b49a 663 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 664 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 665
c66ac9db 666 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 667 dev->transport->transport_complete(cmd,
668 cmd->t_data_sg,
669 transport_get_sense_buffer(cmd));
670 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 671 success = 1;
c66ac9db
NB		 672 }
673
674 /*
5787cacd 675 * See if we are waiting to complete for an exception condition.
c66ac9db 676 */
cf572a96 677 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 678 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 679 complete(&cmd->task_stop_comp);
c66ac9db
NB		 680 return;
681 }
2235007c 682
3d28934a 683 /*
125d0119 684 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 685 * and transport_wait_for_tasks() will be waiting for completion..
686 */
687 if (cmd->transport_state & CMD_T_ABORTED &&
688 cmd->transport_state & CMD_T_STOP) {
689 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
690 complete(&cmd->t_transport_stop_comp);
691 return;
3dca1471 692 } else if (!success) {
35e0e757 693 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 694 } else {
35e0e757 695 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 696 }
35e0e757 697
35e0e757 698 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 699 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 700 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 701
35e0e757 702 queue_work(target_completion_wq, &cmd->work);
c66ac9db 703}
6bb35e00
CH		 704EXPORT_SYMBOL(target_complete_cmd);
705
cf572a96 706static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 707{
cf572a96
CH		 708 struct se_device *dev = cmd->se_dev;
709 unsigned long flags;
c66ac9db 710
cf572a96
CH		 711 spin_lock_irqsave(&dev->execute_task_lock, flags);
712 if (!cmd->state_active) {
713 list_add_tail(&cmd->state_list, &dev->state_list);
714 cmd->state_active = true;
c66ac9db 715 }
cf572a96 716 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 717}
718
07bde79a 719/*
f147abb4 720 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 721 */
7a6f0a1e
CH		 722static void transport_write_pending_qf(struct se_cmd *cmd);
723static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 724
0fd97ccf 725void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 726{
727 struct se_device *dev = container_of(work, struct se_device,
728 qf_work_queue);
bcac364a 729 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 730 struct se_cmd *cmd, *cmd_tmp;
731
732 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 733 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
734 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 735
bcac364a 736 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 737 list_del(&cmd->se_qf_node);
738 atomic_dec(&dev->dev_qf_count);
739 smp_mb__after_atomic_dec();
07bde79a 740
6708bb27 741 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 742 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 743 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 744 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
745 : "UNKNOWN");
f7a5cc0b 746
7a6f0a1e
CH		 747 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
748 transport_write_pending_qf(cmd);
749 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
750 transport_complete_qf(cmd);
07bde79a 751 }
07bde79a
NB		 752}
753
c66ac9db
NB		 754unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
755{
756 switch (cmd->data_direction) {
757 case DMA_NONE:
758 return "NONE";
759 case DMA_FROM_DEVICE:
760 return "READ";
761 case DMA_TO_DEVICE:
762 return "WRITE";
763 case DMA_BIDIRECTIONAL:
764 return "BIDI";
765 default:
766 break;
767 }
768
769 return "UNKNOWN";
770}
771
772void transport_dump_dev_state(
773 struct se_device *dev,
774 char *b,
775 int *bl)
776{
777 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 778 if (dev->export_count)
c66ac9db 779 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 780 else
c66ac9db 781 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 782
5f41a31d 783 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 784 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 785 dev->dev_attrib.block_size,
786 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 787 *bl += sprintf(b + *bl, " ");
788}
789
c66ac9db
NB		 790void transport_dump_vpd_proto_id(
791 struct t10_vpd *vpd,
792 unsigned char *p_buf,
793 int p_buf_len)
794{
795 unsigned char buf[VPD_TMP_BUF_SIZE];
796 int len;
797
798 memset(buf, 0, VPD_TMP_BUF_SIZE);
799 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
800
801 switch (vpd->protocol_identifier) {
802 case 0x00:
803 sprintf(buf+len, "Fibre Channel\n");
804 break;
805 case 0x10:
806 sprintf(buf+len, "Parallel SCSI\n");
807 break;
808 case 0x20:
809 sprintf(buf+len, "SSA\n");
810 break;
811 case 0x30:
812 sprintf(buf+len, "IEEE 1394\n");
813 break;
814 case 0x40:
815 sprintf(buf+len, "SCSI Remote Direct Memory Access"
816 " Protocol\n");
817 break;
818 case 0x50:
819 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
820 break;
821 case 0x60:
822 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
823 break;
824 case 0x70:
825 sprintf(buf+len, "Automation/Drive Interface Transport"
826 " Protocol\n");
827 break;
828 case 0x80:
829 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
830 break;
831 default:
832 sprintf(buf+len, "Unknown 0x%02x\n",
833 vpd->protocol_identifier);
834 break;
835 }
836
837 if (p_buf)
838 strncpy(p_buf, buf, p_buf_len);
839 else
6708bb27 840 pr_debug("%s", buf);
c66ac9db
NB		 841}
842
843void
844transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
845{
846 /*
847 * Check if the Protocol Identifier Valid (PIV) bit is set..
848 *
849 * from spc3r23.pdf section 7.5.1
850 */
851 if (page_83[1] & 0x80) {
852 vpd->protocol_identifier = (page_83[0] & 0xf0);
853 vpd->protocol_identifier_set = 1;
854 transport_dump_vpd_proto_id(vpd, NULL, 0);
855 }
856}
857EXPORT_SYMBOL(transport_set_vpd_proto_id);
858
859int transport_dump_vpd_assoc(
860 struct t10_vpd *vpd,
861 unsigned char *p_buf,
862 int p_buf_len)
863{
864 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 865 int ret = 0;
866 int len;
c66ac9db
NB		 867
868 memset(buf, 0, VPD_TMP_BUF_SIZE);
869 len = sprintf(buf, "T10 VPD Identifier Association: ");
870
871 switch (vpd->association) {
872 case 0x00:
873 sprintf(buf+len, "addressed logical unit\n");
874 break;
875 case 0x10:
876 sprintf(buf+len, "target port\n");
877 break;
878 case 0x20:
879 sprintf(buf+len, "SCSI target device\n");
880 break;
881 default:
882 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 883 ret = -EINVAL;
c66ac9db
NB		 884 break;
885 }
886
887 if (p_buf)
888 strncpy(p_buf, buf, p_buf_len);
889 else
6708bb27 890 pr_debug("%s", buf);
c66ac9db
NB		 891
892 return ret;
893}
894
895int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
896{
897 /*
898 * The VPD identification association..
899 *
900 * from spc3r23.pdf Section 7.6.3.1 Table 297
901 */
902 vpd->association = (page_83[1] & 0x30);
903 return transport_dump_vpd_assoc(vpd, NULL, 0);
904}
905EXPORT_SYMBOL(transport_set_vpd_assoc);
906
907int transport_dump_vpd_ident_type(
908 struct t10_vpd *vpd,
909 unsigned char *p_buf,
910 int p_buf_len)
911{
912 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 913 int ret = 0;
914 int len;
c66ac9db
NB		 915
916 memset(buf, 0, VPD_TMP_BUF_SIZE);
917 len = sprintf(buf, "T10 VPD Identifier Type: ");
918
919 switch (vpd->device_identifier_type) {
920 case 0x00:
921 sprintf(buf+len, "Vendor specific\n");
922 break;
923 case 0x01:
924 sprintf(buf+len, "T10 Vendor ID based\n");
925 break;
926 case 0x02:
927 sprintf(buf+len, "EUI-64 based\n");
928 break;
929 case 0x03:
930 sprintf(buf+len, "NAA\n");
931 break;
932 case 0x04:
933 sprintf(buf+len, "Relative target port identifier\n");
934 break;
935 case 0x08:
936 sprintf(buf+len, "SCSI name string\n");
937 break;
938 default:
939 sprintf(buf+len, "Unsupported: 0x%02x\n",
940 vpd->device_identifier_type);
e3d6f909 941 ret = -EINVAL;
c66ac9db
NB		 942 break;
943 }
944
e3d6f909
AG		 945 if (p_buf) {
946 if (p_buf_len < strlen(buf)+1)
947 return -EINVAL;
c66ac9db 948 strncpy(p_buf, buf, p_buf_len);
e3d6f909 949 } else {
6708bb27 950 pr_debug("%s", buf);
e3d6f909 951 }
c66ac9db
NB		 952
953 return ret;
954}
955
956int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
957{
958 /*
959 * The VPD identifier type..
960 *
961 * from spc3r23.pdf Section 7.6.3.1 Table 298
962 */
963 vpd->device_identifier_type = (page_83[1] & 0x0f);
964 return transport_dump_vpd_ident_type(vpd, NULL, 0);
965}
966EXPORT_SYMBOL(transport_set_vpd_ident_type);
967
968int transport_dump_vpd_ident(
969 struct t10_vpd *vpd,
970 unsigned char *p_buf,
971 int p_buf_len)
972{
973 unsigned char buf[VPD_TMP_BUF_SIZE];
974 int ret = 0;
975
976 memset(buf, 0, VPD_TMP_BUF_SIZE);
977
978 switch (vpd->device_identifier_code_set) {
979 case 0x01: /* Binary */
703d641d
DC		 980 snprintf(buf, sizeof(buf),
981 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 982 &vpd->device_identifier[0]);
983 break;
984 case 0x02: /* ASCII */
703d641d
DC		 985 snprintf(buf, sizeof(buf),
986 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 987 &vpd->device_identifier[0]);
988 break;
989 case 0x03: /* UTF-8 */
703d641d
DC		 990 snprintf(buf, sizeof(buf),
991 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 992 &vpd->device_identifier[0]);
993 break;
994 default:
995 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
996 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 997 ret = -EINVAL;
c66ac9db
NB		 998 break;
999 }
1000
1001 if (p_buf)
1002 strncpy(p_buf, buf, p_buf_len);
1003 else
6708bb27 1004 pr_debug("%s", buf);
c66ac9db
NB		 1005
1006 return ret;
1007}
1008
1009int
1010transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1011{
1012 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1013 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1014
1015 /*
1016 * The VPD Code Set (encoding)
1017 *
1018 * from spc3r23.pdf Section 7.6.3.1 Table 296
1019 */
1020 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1021 switch (vpd->device_identifier_code_set) {
1022 case 0x01: /* Binary */
1023 vpd->device_identifier[j++] =
1024 hex_str[vpd->device_identifier_type];
1025 while (i < (4 + page_83[3])) {
1026 vpd->device_identifier[j++] =
1027 hex_str[(page_83[i] & 0xf0) >> 4];
1028 vpd->device_identifier[j++] =
1029 hex_str[page_83[i] & 0x0f];
1030 i++;
1031 }
1032 break;
1033 case 0x02: /* ASCII */
1034 case 0x03: /* UTF-8 */
1035 while (i < (4 + page_83[3]))
1036 vpd->device_identifier[j++] = page_83[i++];
1037 break;
1038 default:
1039 break;
1040 }
1041
1042 return transport_dump_vpd_ident(vpd, NULL, 0);
1043}
1044EXPORT_SYMBOL(transport_set_vpd_ident);
1045
de103c93
CH		 1046sense_reason_t
1047target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1048{
1049 struct se_device *dev = cmd->se_dev;
1050
1051 if (cmd->unknown_data_length) {
1052 cmd->data_length = size;
1053 } else if (size != cmd->data_length) {
1054 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1055 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1056 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1057 cmd->data_length, size, cmd->t_task_cdb[0]);
1058
9b3b8041
CH		 1059 if (cmd->data_direction == DMA_TO_DEVICE) {
1060 pr_err("Rejecting underflow/overflow"
1061 " WRITE data\n");
de103c93 1062 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1063 }
1064 /*
1065 * Reject READ_* or WRITE_* with overflow/underflow for
1066 * type SCF_SCSI_DATA_CDB.
1067 */
0fd97ccf 1068 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1069 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1070 " CDB on non 512-byte sector setup subsystem"
1071 " plugin: %s\n", dev->transport->name);
1072 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1073 return TCM_INVALID_CDB_FIELD;
9b3b8041 1074 }
4c054ba6
NB		 1075 /*
1076 * For the overflow case keep the existing fabric provided
1077 * ->data_length. Otherwise for the underflow case, reset
1078 * ->data_length to the smaller SCSI expected data transfer
1079 * length.
1080 */
9b3b8041
CH		 1081 if (size > cmd->data_length) {
1082 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1083 cmd->residual_count = (size - cmd->data_length);
1084 } else {
1085 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1086 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1087 cmd->data_length = size;
9b3b8041 1088 }
9b3b8041
CH		 1089 }
1090
1091 return 0;
1092
9b3b8041
CH		 1093}
1094
c66ac9db
NB		 1095/*
1096 * Used by fabric modules containing a local struct se_cmd within their
1097 * fabric dependent per I/O descriptor.
1098 */
1099void transport_init_se_cmd(
1100 struct se_cmd *cmd,
1101 struct target_core_fabric_ops *tfo,
1102 struct se_session *se_sess,
1103 u32 data_length,
1104 int data_direction,
1105 int task_attr,
1106 unsigned char *sense_buffer)
1107{
5951146d 1108 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1109 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1110 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1111 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1112 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1113 init_completion(&cmd->cmd_wait_comp);
cf572a96 1114 init_completion(&cmd->task_stop_comp);
a1d8b49a 1115 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1116 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1117
1118 cmd->se_tfo = tfo;
1119 cmd->se_sess = se_sess;
1120 cmd->data_length = data_length;
1121 cmd->data_direction = data_direction;
1122 cmd->sam_task_attr = task_attr;
1123 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1124
1125 cmd->state_active = false;
c66ac9db
NB		 1126}
1127EXPORT_SYMBOL(transport_init_se_cmd);
1128
de103c93
CH		 1129static sense_reason_t
1130transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1131{
019c4ca6
CH		 1132 struct se_device *dev = cmd->se_dev;
1133
c66ac9db
NB		 1134 /*
1135 * Check if SAM Task Attribute emulation is enabled for this
1136 * struct se_device storage object
1137 */
019c4ca6 1138 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1139 return 0;
1140
e66ecd50 1141 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1142 pr_debug("SAM Task Attribute ACA"
c66ac9db 1143 " emulation is not supported\n");
de103c93 1144 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1145 }
1146 /*
1147 * Used to determine when ORDERED commands should go from
1148 * Dormant to Active status.
1149 */
019c4ca6 1150 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1151 smp_mb__after_atomic_inc();
6708bb27 1152 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1153 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1154 dev->transport->name);
c66ac9db
NB		 1155 return 0;
1156}
1157
de103c93
CH		 1158sense_reason_t
1159target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1160{
0fd97ccf 1161 struct se_device *dev = cmd->se_dev;
de103c93 1162 sense_reason_t ret;
c66ac9db 1163
c66ac9db
NB		 1164 /*
1165 * Ensure that the received CDB is less than the max (252 + 8) bytes
1166 * for VARIABLE_LENGTH_CMD
1167 */
1168 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1169 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1170 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1171 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1172 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1173 }
1174 /*
1175 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1176 * allocate the additional extended CDB buffer now.. Otherwise
1177 * setup the pointer from __t_task_cdb to t_task_cdb.
1178 */
a1d8b49a
AG		 1179 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1180 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1181 GFP_KERNEL);
6708bb27
AG		 1182 if (!cmd->t_task_cdb) {
1183 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1184 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1185 scsi_command_size(cdb),
a1d8b49a 1186 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1187 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1188 }
1189 } else
a1d8b49a 1190 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1191 /*
a1d8b49a 1192 * Copy the original CDB into cmd->
c66ac9db 1193 */
a1d8b49a 1194 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1195
e5c0d6ad
RD		 1196 trace_target_sequencer_start(cmd);
1197
cb4f4d3c
CH		 1198 /*
1199 * Check for an existing UNIT ATTENTION condition
1200 */
de103c93
CH		 1201 ret = target_scsi3_ua_check(cmd);
1202 if (ret)
1203 return ret;
cb4f4d3c 1204
c87fbd56 1205 ret = target_alua_state_check(cmd);
de103c93
CH		 1206 if (ret)
1207 return ret;
cb4f4d3c 1208
d977f437 1209 ret = target_check_reservation(cmd);
f85eda8d
NB		 1210 if (ret) {
1211 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1212 return ret;
f85eda8d 1213 }
cb4f4d3c 1214
0fd97ccf 1215 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1216 if (ret)
1217 return ret;
1218
1219 ret = transport_check_alloc_task_attr(cmd);
1220 if (ret)
c66ac9db 1221 return ret;
cb4f4d3c 1222
cb4f4d3c 1223 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1224
c66ac9db
NB		 1225 spin_lock(&cmd->se_lun->lun_sep_lock);
1226 if (cmd->se_lun->lun_sep)
1227 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1228 spin_unlock(&cmd->se_lun->lun_sep_lock);
1229 return 0;
1230}
a12f41f8 1231EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1232
695434e1
NB		 1233/*
1234 * Used by fabric module frontends to queue tasks directly.
1235 * Many only be used from process context only
1236 */
1237int transport_handle_cdb_direct(
1238 struct se_cmd *cmd)
1239{
de103c93 1240 sense_reason_t ret;
dd8ae59d 1241
695434e1
NB		 1242 if (!cmd->se_lun) {
1243 dump_stack();
6708bb27 1244 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1245 return -EINVAL;
1246 }
1247 if (in_interrupt()) {
1248 dump_stack();
6708bb27 1249 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1250 " from interrupt context\n");
1251 return -EINVAL;
1252 }
dd8ae59d 1253 /*
af877292
CH		 1254 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1255 * outstanding descriptors are handled correctly during shutdown via
1256 * transport_wait_for_tasks()
dd8ae59d
NB		 1257 *
1258 * Also, we don't take cmd->t_state_lock here as we only expect
1259 * this to be called for initial descriptor submission.
1260 */
1261 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1262 cmd->transport_state |= CMD_T_ACTIVE;
1263
dd8ae59d
NB		 1264 /*
1265 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1266 * so follow TRANSPORT_NEW_CMD processing thread context usage
1267 * and call transport_generic_request_failure() if necessary..
1268 */
1269 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1270 if (ret)
1271 transport_generic_request_failure(cmd, ret);
dd8ae59d 1272 return 0;
695434e1
NB		 1273}
1274EXPORT_SYMBOL(transport_handle_cdb_direct);
1275
c5ff8d6b 1276sense_reason_t
de103c93
CH		 1277transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1278 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1279{
1280 if (!sgl || !sgl_count)
1281 return 0;
1282
1283 /*
1284 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1285 * scatterlists already have been set to follow what the fabric
1286 * passes for the original expected data transfer length.
1287 */
1288 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1289 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1290 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1291 return TCM_INVALID_CDB_FIELD;
1292 }
1293
1294 cmd->t_data_sg = sgl;
1295 cmd->t_data_nents = sgl_count;
1296
1297 if (sgl_bidi && sgl_bidi_count) {
1298 cmd->t_bidi_data_sg = sgl_bidi;
1299 cmd->t_bidi_data_nents = sgl_bidi_count;
1300 }
1301 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1302 return 0;
1303}
1304
a026757f
NB		 1305/*
1306 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1307 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1308 *
1309 * @se_cmd: command descriptor to submit
1310 * @se_sess: associated se_sess for endpoint
1311 * @cdb: pointer to SCSI CDB
1312 * @sense: pointer to SCSI sense buffer
1313 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1314 * @data_length: fabric expected data transfer length
1315 * @task_addr: SAM task attribute
1316 * @data_dir: DMA data direction
1317 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1318 * @sgl: struct scatterlist memory for unidirectional mapping
1319 * @sgl_count: scatterlist count for unidirectional mapping
1320 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1321 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1322 * @sgl_prot: struct scatterlist memory protection information
1323 * @sgl_prot_count: scatterlist count for protection information
a6360785 1324 *
d6dfc868
RD		 1325 * Returns non zero to signal active I/O shutdown failure. All other
1326 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1327 * but still return zero here.
1328 *
a6360785
NB		 1329 * This may only be called from process context, and also currently
1330 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1331 */
1332int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1333 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1334 u32 data_length, int task_attr, int data_dir, int flags,
1335 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1336 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1337 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1338{
1339 struct se_portal_group *se_tpg;
de103c93
CH		 1340 sense_reason_t rc;
1341 int ret;
a6360785
NB		 1342
1343 se_tpg = se_sess->se_tpg;
1344 BUG_ON(!se_tpg);
1345 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1346 BUG_ON(in_interrupt());
1347 /*
1348 * Initialize se_cmd for target operation. From this point
1349 * exceptions are handled by sending exception status via
1350 * target_core_fabric_ops->queue_status() callback
1351 */
1352 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1353 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1354 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1355 se_cmd->unknown_data_length = 1;
a6360785
NB		 1356 /*
1357 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1358 * se_sess->sess_cmd_list. A second kref_get here is necessary
1359 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1360 * kref_put() to happen during fabric packet acknowledgement.
1361 */
de103c93
CH		 1362 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1363 if (ret)
1364 return ret;
a6360785
NB		 1365 /*
1366 * Signal bidirectional data payloads to target-core
1367 */
1368 if (flags & TARGET_SCF_BIDI_OP)
1369 se_cmd->se_cmd_flags |= SCF_BIDI;
1370 /*
1371 * Locate se_lun pointer and attach it to struct se_cmd
1372 */
de103c93
CH		 1373 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1374 if (rc) {
1375 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1376 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1377 return 0;
735703ca 1378 }
b5b8e298
SG		 1379
1380 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1381 if (rc != 0) {
1382 transport_generic_request_failure(se_cmd, rc);
1383 return 0;
1384 }
1385
def2b339
NB		 1386 /*
1387 * Save pointers for SGLs containing protection information,
1388 * if present.
1389 */
1390 if (sgl_prot_count) {
1391 se_cmd->t_prot_sg = sgl_prot;
1392 se_cmd->t_prot_nents = sgl_prot_count;
1393 }
d6e0175c 1394
a026757f
NB		 1395 /*
1396 * When a non zero sgl_count has been passed perform SGL passthrough
1397 * mapping for pre-allocated fabric memory instead of having target
1398 * core perform an internal SGL allocation..
1399 */
1400 if (sgl_count != 0) {
1401 BUG_ON(!sgl);
1402
944981c7
NB		 1403 /*
1404 * A work-around for tcm_loop as some userspace code via
1405 * scsi-generic do not memset their associated read buffers,
1406 * so go ahead and do that here for type non-data CDBs. Also
1407 * note that this is currently guaranteed to be a single SGL
1408 * for this case by target core in target_setup_cmd_from_cdb()
1409 * -> transport_generic_cmd_sequencer().
1410 */
1411 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1412 se_cmd->data_direction == DMA_FROM_DEVICE) {
1413 unsigned char *buf = NULL;
1414
1415 if (sgl)
1416 buf = kmap(sg_page(sgl)) + sgl->offset;
1417
1418 if (buf) {
1419 memset(buf, 0, sgl->length);
1420 kunmap(sg_page(sgl));
1421 }
1422 }
1423
a026757f
NB		 1424 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1425 sgl_bidi, sgl_bidi_count);
1426 if (rc != 0) {
de103c93 1427 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1428 return 0;
1429 }
1430 }
def2b339 1431
11e319ed
AG		 1432 /*
1433 * Check if we need to delay processing because of ALUA
1434 * Active/NonOptimized primary access state..
1435 */
1436 core_alua_check_nonop_delay(se_cmd);
1437
a6360785 1438 transport_handle_cdb_direct(se_cmd);
d6dfc868 1439 return 0;
a6360785 1440}
a026757f
NB		 1441EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1442
1443/*
1444 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1445 *
1446 * @se_cmd: command descriptor to submit
1447 * @se_sess: associated se_sess for endpoint
1448 * @cdb: pointer to SCSI CDB
1449 * @sense: pointer to SCSI sense buffer
1450 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1451 * @data_length: fabric expected data transfer length
1452 * @task_addr: SAM task attribute
1453 * @data_dir: DMA data direction
1454 * @flags: flags for command submission from target_sc_flags_tables
1455 *
1456 * Returns non zero to signal active I/O shutdown failure. All other
1457 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1458 * but still return zero here.
1459 *
1460 * This may only be called from process context, and also currently
1461 * assumes internal allocation of fabric payload buffer by target-core.
1462 *
1463 * It also assumes interal target core SGL memory allocation.
1464 */
1465int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1466 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1467 u32 data_length, int task_attr, int data_dir, int flags)
1468{
1469 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1470 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1471 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1472}
a6360785
NB		 1473EXPORT_SYMBOL(target_submit_cmd);
1474
9f0d05c2
NB		 1475static void target_complete_tmr_failure(struct work_struct *work)
1476{
1477 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1478
1479 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1480 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1481
1482 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1483}
1484
ea98d7f9
AG		 1485/**
1486 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1487 * for TMR CDBs
1488 *
1489 * @se_cmd: command descriptor to submit
1490 * @se_sess: associated se_sess for endpoint
1491 * @sense: pointer to SCSI sense buffer
1492 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1493 * @fabric_context: fabric context for TMR req
1494 * @tm_type: Type of TM request
c0974f89
NB		 1495 * @gfp: gfp type for caller
1496 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1497 * @flags: submit cmd flags
ea98d7f9
AG		 1498 *
1499 * Callable from all contexts.
1500 **/
1501
c7042cae 1502int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1503 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1504 void *fabric_tmr_ptr, unsigned char tm_type,
1505 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1506{
1507 struct se_portal_group *se_tpg;
1508 int ret;
1509
1510 se_tpg = se_sess->se_tpg;
1511 BUG_ON(!se_tpg);
1512
1513 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1514 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1515 /*
1516 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1517 * allocation failure.
1518 */
c0974f89 1519 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1520 if (ret < 0)
1521 return -ENOMEM;
ea98d7f9 1522
c0974f89
NB		 1523 if (tm_type == TMR_ABORT_TASK)
1524 se_cmd->se_tmr_req->ref_task_tag = tag;
1525
ea98d7f9 1526 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1527 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1528 if (ret) {
1529 core_tmr_release_req(se_cmd->se_tmr_req);
1530 return ret;
1531 }
ea98d7f9 1532
ea98d7f9
AG		 1533 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1534 if (ret) {
9f0d05c2
NB		 1535 /*
1536 * For callback during failure handling, push this work off
1537 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1538 */
1539 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1540 schedule_work(&se_cmd->work);
c7042cae 1541 return 0;
ea98d7f9
AG		 1542 }
1543 transport_generic_handle_tmr(se_cmd);
c7042cae 1544 return 0;
ea98d7f9
AG		 1545}
1546EXPORT_SYMBOL(target_submit_tmr);
1547
cdbb70bb 1548/*
cf572a96 1549 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1550 * has completed.
1551 */
cf572a96 1552bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1553{
cdbb70bb
CH		 1554 bool was_active = false;
1555
cf572a96
CH		 1556 if (cmd->transport_state & CMD_T_BUSY) {
1557 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1558 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1559
cf572a96
CH		 1560 pr_debug("cmd %p waiting to complete\n", cmd);
1561 wait_for_completion(&cmd->task_stop_comp);
1562 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1563
1564 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1565 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1566 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1567 was_active = true;
1568 }
1569
cdbb70bb
CH		 1570 return was_active;
1571}
1572
c66ac9db
NB		 1573/*
1574 * Handle SAM-esque emulation for generic transport request failures.
1575 */
de103c93
CH		 1576void transport_generic_request_failure(struct se_cmd *cmd,
1577 sense_reason_t sense_reason)
c66ac9db 1578{
07bde79a
NB		 1579 int ret = 0;
1580
6708bb27 1581 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1582 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1583 cmd->t_task_cdb[0]);
de103c93 1584 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1585 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1586 cmd->t_state, sense_reason);
d43d6aea 1587 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1588 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1589 (cmd->transport_state & CMD_T_STOP) != 0,
1590 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1591
c66ac9db
NB		 1592 /*
1593 * For SAM Task Attribute emulation for failed struct se_cmd
1594 */
019c4ca6 1595 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1596 /*
1597 * Handle special case for COMPARE_AND_WRITE failure, where the
1598 * callback is expected to drop the per device ->caw_mutex.
1599 */
1600 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1601 cmd->transport_complete_callback)
1602 cmd->transport_complete_callback(cmd);
c66ac9db 1603
de103c93 1604 switch (sense_reason) {
03e98c9e
NB		 1605 case TCM_NON_EXISTENT_LUN:
1606 case TCM_UNSUPPORTED_SCSI_OPCODE:
1607 case TCM_INVALID_CDB_FIELD:
1608 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1609 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1610 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1611 case TCM_UNKNOWN_MODE_PAGE:
1612 case TCM_WRITE_PROTECTED:
e2397c70 1613 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1614 case TCM_CHECK_CONDITION_ABORT_CMD:
1615 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1616 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1617 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1618 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1619 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1620 break;
de103c93
CH		 1621 case TCM_OUT_OF_RESOURCES:
1622 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1623 break;
03e98c9e 1624 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1625 /*
1626 * No SENSE Data payload for this case, set SCSI Status
1627 * and queue the response to $FABRIC_MOD.
1628 *
1629 * Uses linux/include/scsi/scsi.h SAM status codes defs
1630 */
1631 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1632 /*
1633 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1634 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1635 * CONFLICT STATUS.
1636 *
1637 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1638 */
e3d6f909 1639 if (cmd->se_sess &&
0fd97ccf 1640 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1641 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1642 cmd->orig_fe_lun, 0x2C,
1643 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1644
e5c0d6ad
RD		 1645 trace_target_cmd_complete(cmd);
1646 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1647 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1648 goto queue_full;
c66ac9db 1649 goto check_stop;
c66ac9db 1650 default:
6708bb27 1651 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1652 cmd->t_task_cdb[0], sense_reason);
1653 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1654 break;
1655 }
f3146437 1656
de103c93 1657 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1658 if (ret == -EAGAIN || ret == -ENOMEM)
1659 goto queue_full;
07bde79a 1660
c66ac9db
NB		 1661check_stop:
1662 transport_lun_remove_cmd(cmd);
6708bb27 1663 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1664 ;
07bde79a
NB		 1665 return;
1666
1667queue_full:
e057f533
CH		 1668 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1669 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1670}
2fbff127 1671EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1672
76dde50e 1673void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1674{
de103c93 1675 sense_reason_t ret;
5f41a31d 1676
de103c93
CH		 1677 if (cmd->execute_cmd) {
1678 ret = cmd->execute_cmd(cmd);
1679 if (ret) {
1680 spin_lock_irq(&cmd->t_state_lock);
1681 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1682 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1683
de103c93
CH		 1684 transport_generic_request_failure(cmd, ret);
1685 }
5f41a31d
CH		 1686 }
1687}
1688
019c4ca6 1689static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1690{
1691 struct se_device *dev = cmd->se_dev;
1692
019c4ca6
CH		 1693 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1694 return false;
5f41a31d 1695
c66ac9db 1696 /*
25985edc 1697 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1698 * to allow the passed struct se_cmd list of tasks to the front of the list.
1699 */
5f41a31d
CH		 1700 switch (cmd->sam_task_attr) {
1701 case MSG_HEAD_TAG:
1702 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1703 "se_ordered_id: %u\n",
1704 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1705 return false;
5f41a31d
CH		 1706 case MSG_ORDERED_TAG:
1707 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1708 smp_mb__after_atomic_inc();
1709
5f41a31d
CH		 1710 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1711 " se_ordered_id: %u\n",
1712 cmd->t_task_cdb[0], cmd->se_ordered_id);
1713
c66ac9db 1714 /*
5f41a31d
CH		 1715 * Execute an ORDERED command if no other older commands
1716 * exist that need to be completed first.
c66ac9db 1717 */
5f41a31d 1718 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1719 return false;
5f41a31d
CH		 1720 break;
1721 default:
c66ac9db
NB		 1722 /*
1723 * For SIMPLE and UNTAGGED Task Attribute commands
1724 */
5f41a31d 1725 atomic_inc(&dev->simple_cmds);
c66ac9db 1726 smp_mb__after_atomic_inc();
5f41a31d 1727 break;
c66ac9db 1728 }
5f41a31d 1729
019c4ca6
CH		 1730 if (atomic_read(&dev->dev_ordered_sync) == 0)
1731 return false;
c66ac9db 1732
019c4ca6
CH		 1733 spin_lock(&dev->delayed_cmd_lock);
1734 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1735 spin_unlock(&dev->delayed_cmd_lock);
1736
1737 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1738 " delayed CMD list, se_ordered_id: %u\n",
1739 cmd->t_task_cdb[0], cmd->sam_task_attr,
1740 cmd->se_ordered_id);
1741 return true;
1742}
1743
1744void target_execute_cmd(struct se_cmd *cmd)
1745{
1746 /*
1747 * If the received CDB has aleady been aborted stop processing it here.
1748 */
4a9a6c8d 1749 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1750 return;
c66ac9db 1751
019c4ca6
CH		 1752 /*
1753 * Determine if frontend context caller is requesting the stopping of
1754 * this command for frontend exceptions.
1755 */
4a9a6c8d 1756 spin_lock_irq(&cmd->t_state_lock);
019c4ca6
CH		 1757 if (cmd->transport_state & CMD_T_STOP) {
1758 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1759 __func__, __LINE__,
1760 cmd->se_tfo->get_task_tag(cmd));
1761
1762 spin_unlock_irq(&cmd->t_state_lock);
1763 complete(&cmd->t_transport_stop_comp);
1764 return;
1765 }
1766
1767 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1768 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1769 spin_unlock_irq(&cmd->t_state_lock);
a84bf9ee
NB		 1770 /*
1771 * Perform WRITE_INSERT of PI using software emulation when backend
1772 * device has PI enabled, if the transport has not already generated
1773 * PI using hardware WRITE_INSERT offload.
1774 */
1775 if (cmd->prot_op == TARGET_PROT_DOUT_INSERT) {
1776 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1777 sbc_dif_generate(cmd);
1778 }
019c4ca6 1779
1a398b97
NB		 1780 if (target_handle_task_attr(cmd)) {
1781 spin_lock_irq(&cmd->t_state_lock);
1782 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1783 spin_unlock_irq(&cmd->t_state_lock);
1784 return;
1785 }
1786
1787 __target_execute_cmd(cmd);
c66ac9db 1788}
70baf0ab 1789EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1790
5f41a31d
CH		 1791/*
1792 * Process all commands up to the last received ORDERED task attribute which
1793 * requires another blocking boundary
1794 */
1795static void target_restart_delayed_cmds(struct se_device *dev)
1796{
1797 for (;;) {
1798 struct se_cmd *cmd;
1799
1800 spin_lock(&dev->delayed_cmd_lock);
1801 if (list_empty(&dev->delayed_cmd_list)) {
1802 spin_unlock(&dev->delayed_cmd_lock);
1803 break;
1804 }
1805
1806 cmd = list_entry(dev->delayed_cmd_list.next,
1807 struct se_cmd, se_delayed_node);
1808 list_del(&cmd->se_delayed_node);
1809 spin_unlock(&dev->delayed_cmd_lock);
1810
1811 __target_execute_cmd(cmd);
1812
1813 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1814 break;
1815 }
1816}
1817
c66ac9db 1818/*
35e0e757 1819 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1820 * and ordered cmds need to have their tasks added to the execution queue.
1821 */
1822static void transport_complete_task_attr(struct se_cmd *cmd)
1823{
5951146d 1824 struct se_device *dev = cmd->se_dev;
c66ac9db 1825
019c4ca6
CH		 1826 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1827 return;
1828
e66ecd50 1829 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1830 atomic_dec(&dev->simple_cmds);
1831 smp_mb__after_atomic_dec();
1832 dev->dev_cur_ordered_id++;
6708bb27 1833 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1834 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1835 cmd->se_ordered_id);
e66ecd50 1836 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1837 dev->dev_cur_ordered_id++;
6708bb27 1838 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1839 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1840 cmd->se_ordered_id);
e66ecd50 1841 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1842 atomic_dec(&dev->dev_ordered_sync);
1843 smp_mb__after_atomic_dec();
c66ac9db
NB		 1844
1845 dev->dev_cur_ordered_id++;
6708bb27 1846 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1847 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1848 }
c66ac9db 1849
5f41a31d 1850 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1851}
1852
e057f533 1853static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1854{
1855 int ret = 0;
1856
019c4ca6 1857 transport_complete_task_attr(cmd);
e057f533
CH		 1858
1859 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1860 trace_target_cmd_complete(cmd);
e057f533
CH		 1861 ret = cmd->se_tfo->queue_status(cmd);
1862 if (ret)
1863 goto out;
1864 }
07bde79a
NB		 1865
1866 switch (cmd->data_direction) {
1867 case DMA_FROM_DEVICE:
e5c0d6ad 1868 trace_target_cmd_complete(cmd);
07bde79a
NB		 1869 ret = cmd->se_tfo->queue_data_in(cmd);
1870 break;
1871 case DMA_TO_DEVICE:
64577407 1872 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a
NB		 1873 ret = cmd->se_tfo->queue_data_in(cmd);
1874 if (ret < 0)
e057f533 1875 break;
07bde79a
NB		 1876 }
1877 /* Fall through for DMA_TO_DEVICE */
1878 case DMA_NONE:
e5c0d6ad 1879 trace_target_cmd_complete(cmd);
07bde79a
NB		 1880 ret = cmd->se_tfo->queue_status(cmd);
1881 break;
1882 default:
1883 break;
1884 }
1885
e057f533
CH		 1886out:
1887 if (ret < 0) {
1888 transport_handle_queue_full(cmd, cmd->se_dev);
1889 return;
1890 }
1891 transport_lun_remove_cmd(cmd);
1892 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1893}
1894
1895static void transport_handle_queue_full(
1896 struct se_cmd *cmd,
e057f533 1897 struct se_device *dev)
07bde79a
NB		 1898{
1899 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1900 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1901 atomic_inc(&dev->dev_qf_count);
1902 smp_mb__after_atomic_inc();
1903 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1904
1905 schedule_work(&cmd->se_dev->qf_work_queue);
1906}
1907
bc005869
NB		 1908static bool target_check_read_strip(struct se_cmd *cmd)
1909{
1910 sense_reason_t rc;
1911
1912 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
1913 rc = sbc_dif_read_strip(cmd);
1914 if (rc) {
1915 cmd->pi_err = rc;
1916 return true;
1917 }
1918 }
1919
1920 return false;
1921}
1922
35e0e757 1923static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1924{
35e0e757 1925 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1926 int ret;
35e0e757 1927
c66ac9db
NB		 1928 /*
1929 * Check if we need to move delayed/dormant tasks from cmds on the
1930 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1931 * Attribute.
1932 */
019c4ca6
CH		 1933 transport_complete_task_attr(cmd);
1934
07bde79a
NB		 1935 /*
1936 * Check to schedule QUEUE_FULL work, or execute an existing
1937 * cmd->transport_qf_callback()
1938 */
1939 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1940 schedule_work(&cmd->se_dev->qf_work_queue);
1941
c66ac9db 1942 /*
d5829eac 1943 * Check if we need to send a sense buffer from
c66ac9db
NB		 1944 * the struct se_cmd in question.
1945 */
1946 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1947 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1948 ret = transport_send_check_condition_and_sense(
1949 cmd, 0, 1);
1950 if (ret == -EAGAIN || ret == -ENOMEM)
1951 goto queue_full;
1952
1953 transport_lun_remove_cmd(cmd);
1954 transport_cmd_check_stop_to_fabric(cmd);
1955 return;
c66ac9db
NB		 1956 }
1957 /*
25985edc 1958 * Check for a callback, used by amongst other things
a6b0133c 1959 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 1960 */
a6b0133c
NB		 1961 if (cmd->transport_complete_callback) {
1962 sense_reason_t rc;
1963
1964 rc = cmd->transport_complete_callback(cmd);
a2890087 1965 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
a6b0133c 1966 return;
a2890087
NB		 1967 } else if (rc) {
1968 ret = transport_send_check_condition_and_sense(cmd,
1969 rc, 0);
1970 if (ret == -EAGAIN || ret == -ENOMEM)
1971 goto queue_full;
a6b0133c 1972
a2890087
NB		 1973 transport_lun_remove_cmd(cmd);
1974 transport_cmd_check_stop_to_fabric(cmd);
1975 return;
1976 }
a6b0133c 1977 }
c66ac9db
NB		 1978
1979 switch (cmd->data_direction) {
1980 case DMA_FROM_DEVICE:
1981 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1982 if (cmd->se_lun->lun_sep) {
1983 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1984 cmd->data_length;
1985 }
1986 spin_unlock(&cmd->se_lun->lun_sep_lock);
bc005869
NB		 1987 /*
1988 * Perform READ_STRIP of PI using software emulation when
1989 * backend had PI enabled, if the transport will not be
1990 * performing hardware READ_STRIP offload.
1991 */
1992 if (cmd->prot_op == TARGET_PROT_DIN_STRIP &&
1993 target_check_read_strip(cmd)) {
1994 ret = transport_send_check_condition_and_sense(cmd,
1995 cmd->pi_err, 0);
1996 if (ret == -EAGAIN || ret == -ENOMEM)
1997 goto queue_full;
1998
1999 transport_lun_remove_cmd(cmd);
2000 transport_cmd_check_stop_to_fabric(cmd);
2001 return;
2002 }
c66ac9db 2003
e5c0d6ad 2004 trace_target_cmd_complete(cmd);
07bde79a 2005 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2006 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2007 goto queue_full;
c66ac9db
NB		 2008 break;
2009 case DMA_TO_DEVICE:
2010 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2011 if (cmd->se_lun->lun_sep) {
2012 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2013 cmd->data_length;
2014 }
2015 spin_unlock(&cmd->se_lun->lun_sep_lock);
2016 /*
2017 * Check if we need to send READ payload for BIDI-COMMAND
2018 */
64577407 2019 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 2020 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2021 if (cmd->se_lun->lun_sep) {
2022 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2023 cmd->data_length;
2024 }
2025 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2026 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2027 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2028 goto queue_full;
c66ac9db
NB		 2029 break;
2030 }
2031 /* Fall through for DMA_TO_DEVICE */
2032 case DMA_NONE:
e5c0d6ad 2033 trace_target_cmd_complete(cmd);
07bde79a 2034 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2035 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2036 goto queue_full;
c66ac9db
NB		 2037 break;
2038 default:
2039 break;
2040 }
2041
2042 transport_lun_remove_cmd(cmd);
2043 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2044 return;
2045
2046queue_full:
6708bb27 2047 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2048 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2049 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2050 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2051}
2052
6708bb27 2053static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2054{
ec98f782 2055 struct scatterlist *sg;
ec98f782 2056 int count;
c66ac9db 2057
6708bb27
AG		 2058 for_each_sg(sgl, sg, nents, count)
2059 __free_page(sg_page(sg));
c66ac9db 2060
6708bb27
AG		 2061 kfree(sgl);
2062}
c66ac9db 2063
47e459e6
NB		 2064static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2065{
2066 /*
2067 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2068 * emulation, and free + reset pointers if necessary..
2069 */
2070 if (!cmd->t_data_sg_orig)
2071 return;
2072
2073 kfree(cmd->t_data_sg);
2074 cmd->t_data_sg = cmd->t_data_sg_orig;
2075 cmd->t_data_sg_orig = NULL;
2076 cmd->t_data_nents = cmd->t_data_nents_orig;
2077 cmd->t_data_nents_orig = 0;
2078}
2079
6708bb27
AG		 2080static inline void transport_free_pages(struct se_cmd *cmd)
2081{
47e459e6
NB		 2082 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2083 transport_reset_sgl_orig(cmd);
6708bb27 2084 return;
47e459e6
NB		 2085 }
2086 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2087
2088 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2089 cmd->t_data_sg = NULL;
2090 cmd->t_data_nents = 0;
c66ac9db 2091
6708bb27 2092 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2093 cmd->t_bidi_data_sg = NULL;
2094 cmd->t_bidi_data_nents = 0;
acb2bde3
SG		 2095
2096 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2097 cmd->t_prot_sg = NULL;
2098 cmd->t_prot_nents = 0;
c66ac9db
NB		 2099}
2100
e26d99ae
CH		 2101/**
2102 * transport_release_cmd - free a command
2103 * @cmd: command to free
2104 *
2105 * This routine unconditionally frees a command, and reference counting
2106 * or list removal must be done in the caller.
2107 */
d5ddad41 2108static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2109{
2110 BUG_ON(!cmd->se_tfo);
2111
c8e31f26 2112 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2113 core_tmr_release_req(cmd->se_tmr_req);
2114 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2115 kfree(cmd->t_task_cdb);
2116 /*
7481deb4
NB		 2117 * If this cmd has been setup with target_get_sess_cmd(), drop
2118 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2119 */
ca24976a 2120 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2121}
2122
d3df7825
CH		 2123/**
2124 * transport_put_cmd - release a reference to a command
2125 * @cmd: command to release
2126 *
2127 * This routine releases our reference to the command and frees it if possible.
2128 */
d5ddad41 2129static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2130{
c66ac9db 2131 transport_free_pages(cmd);
d5ddad41 2132 return transport_release_cmd(cmd);
c66ac9db 2133}
c66ac9db 2134
4949314c 2135void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2136{
ec98f782 2137 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2138 struct page **pages;
2139 int i;
05d1c7c0
AG		 2140
2141 /*
ec98f782
AG		 2142 * We need to take into account a possible offset here for fabrics like
2143 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2144 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2145 */
4949314c
AG		 2146 if (!cmd->t_data_nents)
2147 return NULL;
3717ef0c
PB		 2148
2149 BUG_ON(!sg);
2150 if (cmd->t_data_nents == 1)
4949314c
AG		 2151 return kmap(sg_page(sg)) + sg->offset;
2152
2153 /* >1 page. use vmap */
2154 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2155 if (!pages)
4949314c
AG		 2156 return NULL;
2157
2158 /* convert sg[] to pages[] */
2159 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2160 pages[i] = sg_page(sg);
2161 }
2162
2163 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2164 kfree(pages);
de103c93 2165 if (!cmd->t_data_vmap)
4949314c
AG		 2166 return NULL;
2167
2168 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2169}
4949314c 2170EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2171
4949314c 2172void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2173{
a1edf9cf 2174 if (!cmd->t_data_nents) {
4949314c 2175 return;
a1edf9cf 2176 } else if (cmd->t_data_nents == 1) {
4949314c 2177 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2178 return;
2179 }
4949314c
AG		 2180
2181 vunmap(cmd->t_data_vmap);
2182 cmd->t_data_vmap = NULL;
05d1c7c0 2183}
4949314c 2184EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2185
c5ff8d6b 2186int
20093994
NB		 2187target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2188 bool zero_page)
c66ac9db 2189{
20093994 2190 struct scatterlist *sg;
ec98f782 2191 struct page *page;
20093994
NB		 2192 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2193 unsigned int nent;
ec98f782 2194 int i = 0;
c66ac9db 2195
20093994
NB		 2196 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2197 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2198 if (!sg)
ec98f782 2199 return -ENOMEM;
c66ac9db 2200
20093994 2201 sg_init_table(sg, nent);
9db9da33 2202
ec98f782
AG		 2203 while (length) {
2204 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2205 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2206 if (!page)
2207 goto out;
c66ac9db 2208
20093994 2209 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2210 length -= page_len;
2211 i++;
c66ac9db 2212 }
20093994
NB		 2213 *sgl = sg;
2214 *nents = nent;
c66ac9db 2215 return 0;
c66ac9db 2216
ec98f782 2217out:
d0e27c88 2218 while (i > 0) {
ec98f782 2219 i--;
20093994 2220 __free_page(sg_page(&sg[i]));
c66ac9db 2221 }
20093994 2222 kfree(sg);
ec98f782 2223 return -ENOMEM;
c66ac9db
NB		 2224}
2225
da0f7619 2226/*
b16a35b0
AG		 2227 * Allocate any required resources to execute the command. For writes we
2228 * might not have the payload yet, so notify the fabric via a call to
2229 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2230 */
de103c93
CH		 2231sense_reason_t
2232transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2233{
c66ac9db
NB		 2234 int ret = 0;
2235
2236 /*
2237 * Determine is the TCM fabric module has already allocated physical
2238 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2239 * beforehand.
c66ac9db 2240 */
ec98f782
AG		 2241 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2242 cmd->data_length) {
20093994
NB		 2243 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2244
8cefe07b
NB		 2245 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2246 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2247 u32 bidi_length;
2248
2249 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2250 bidi_length = cmd->t_task_nolb *
2251 cmd->se_dev->dev_attrib.block_size;
2252 else
2253 bidi_length = cmd->data_length;
2254
2255 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2256 &cmd->t_bidi_data_nents,
2257 bidi_length, zero_flag);
2258 if (ret < 0)
2259 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2260 }
2261
19f9361a 2262 if (cmd->prot_op != TARGET_PROT_NORMAL) {
acb2bde3
SG		 2263 ret = target_alloc_sgl(&cmd->t_prot_sg,
2264 &cmd->t_prot_nents,
2265 cmd->prot_length, true);
2266 if (ret < 0)
2267 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2268 }
2269
20093994
NB		 2270 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2271 cmd->data_length, zero_flag);
c66ac9db 2272 if (ret < 0)
de103c93 2273 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2274 }
c66ac9db 2275 /*
c3196f0c
CH		 2276 * If this command is not a write we can execute it right here,
2277 * for write buffers we need to notify the fabric driver first
2278 * and let it call back once the write buffers are ready.
c66ac9db 2279 */
5f41a31d 2280 target_add_to_state_list(cmd);
c3196f0c
CH		 2281 if (cmd->data_direction != DMA_TO_DEVICE) {
2282 target_execute_cmd(cmd);
2283 return 0;
2284 }
862e6389 2285 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2286
2287 ret = cmd->se_tfo->write_pending(cmd);
2288 if (ret == -EAGAIN || ret == -ENOMEM)
2289 goto queue_full;
2290
de103c93
CH		 2291 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2292 WARN_ON(ret);
2293
b69c1fcf 2294 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2295
c3196f0c
CH		 2296queue_full:
2297 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2298 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2299 transport_handle_queue_full(cmd, cmd->se_dev);
2300 return 0;
c66ac9db 2301}
a1d8b49a 2302EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2303
e057f533 2304static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2305{
f147abb4
NB		 2306 int ret;
2307
2308 ret = cmd->se_tfo->write_pending(cmd);
2309 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2310 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2311 cmd);
2312 transport_handle_queue_full(cmd, cmd->se_dev);
2313 }
07bde79a
NB		 2314}
2315
d5ddad41 2316int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2317{
c130480b 2318 unsigned long flags;
d5ddad41
NB		 2319 int ret = 0;
2320
d14921d6 2321 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2322 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2323 transport_wait_for_tasks(cmd);
2324
d5ddad41 2325 ret = transport_release_cmd(cmd);
d14921d6
NB		 2326 } else {
2327 if (wait_for_tasks)
2328 transport_wait_for_tasks(cmd);
c130480b
NB		 2329 /*
2330 * Handle WRITE failure case where transport_generic_new_cmd()
2331 * has already added se_cmd to state_list, but fabric has
2332 * failed command before I/O submission.
2333 */
2334 if (cmd->state_active) {
2335 spin_lock_irqsave(&cmd->t_state_lock, flags);
2336 target_remove_from_state_list(cmd);
2337 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2338 }
d14921d6 2339
82f1c8a4 2340 if (cmd->se_lun)
c66ac9db 2341 transport_lun_remove_cmd(cmd);
c66ac9db 2342
d5ddad41 2343 ret = transport_put_cmd(cmd);
c66ac9db 2344 }
d5ddad41 2345 return ret;
c66ac9db
NB		 2346}
2347EXPORT_SYMBOL(transport_generic_free_cmd);
2348
a17f091d
NB		 2349/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2350 * @se_sess: session to reference
2351 * @se_cmd: command descriptor to add
a6360785 2352 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2353 */
20361e69 2354int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2355 bool ack_kref)
a17f091d
NB		 2356{
2357 unsigned long flags;
bc187ea6 2358 int ret = 0;
a17f091d 2359
7481deb4 2360 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2361 /*
2362 * Add a second kref if the fabric caller is expecting to handle
2363 * fabric acknowledgement that requires two target_put_sess_cmd()
2364 * invocations before se_cmd descriptor release.
2365 */
86715569 2366 if (ack_kref == true) {
a6360785 2367 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2368 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2369 }
7481deb4 2370
a17f091d 2371 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2372 if (se_sess->sess_tearing_down) {
2373 ret = -ESHUTDOWN;
2374 goto out;
2375 }
a17f091d 2376 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2377out:
a17f091d 2378 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2379 return ret;
a17f091d 2380}
20361e69 2381EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2382
7481deb4 2383static void target_release_cmd_kref(struct kref *kref)
a17f091d 2384{
7481deb4
NB		 2385 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2386 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2387
a17f091d 2388 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2389 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2390 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2391 return;
a17f091d 2392 }
a17f091d 2393 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2394 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2395 complete(&se_cmd->cmd_wait_comp);
7481deb4 2396 return;
a17f091d
NB		 2397 }
2398 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2399 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2400
7481deb4
NB		 2401 se_cmd->se_tfo->release_cmd(se_cmd);
2402}
2403
2404/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2405 * @se_sess: session to reference
2406 * @se_cmd: command descriptor to drop
2407 */
2408int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2409{
ccf5ae83
JE		 2410 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2411 &se_sess->sess_cmd_lock);
a17f091d
NB		 2412}
2413EXPORT_SYMBOL(target_put_sess_cmd);
2414
1c7b13fe
RD		 2415/* target_sess_cmd_list_set_waiting - Flag all commands in
2416 * sess_cmd_list to complete cmd_wait_comp. Set
2417 * sess_tearing_down so no more commands are queued.
2418 * @se_sess: session to flag
a17f091d 2419 */
1c7b13fe 2420void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2421{
2422 struct se_cmd *se_cmd;
2423 unsigned long flags;
2424
a17f091d 2425 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2426 if (se_sess->sess_tearing_down) {
2427 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2428 return;
2429 }
1c7b13fe 2430 se_sess->sess_tearing_down = 1;
9b31a328 2431 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2432
9b31a328 2433 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2434 se_cmd->cmd_wait_set = 1;
2435
2436 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2437}
1c7b13fe 2438EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2439
2440/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2441 * @se_sess: session to wait for active I/O
a17f091d 2442 */
be646c2d 2443void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2444{
2445 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2446 unsigned long flags;
a17f091d
NB		 2447
2448 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2449 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2450 list_del(&se_cmd->se_cmd_list);
2451
2452 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2453 " %d\n", se_cmd, se_cmd->t_state,
2454 se_cmd->se_tfo->get_cmd_state(se_cmd));
2455
be646c2d
JE		 2456 wait_for_completion(&se_cmd->cmd_wait_comp);
2457 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2458 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2459 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2460
2461 se_cmd->se_tfo->release_cmd(se_cmd);
2462 }
9b31a328
NB		 2463
2464 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2465 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2466 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2467
a17f091d
NB		 2468}
2469EXPORT_SYMBOL(target_wait_for_sess_cmds);
2470
5277797d 2471static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2472{
8359cf43 2473 struct se_lun *lun = p;
c66ac9db 2474
5277797d
NB		 2475 percpu_ref_kill(&lun->lun_ref);
2476
2477 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2478 complete(&lun->lun_shutdown_comp);
2479
2480 return 0;
2481}
2482
5277797d 2483int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2484{
2485 struct task_struct *kt;
2486
5277797d 2487 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2488 "tcm_cl_%u", lun->unpacked_lun);
2489 if (IS_ERR(kt)) {
6708bb27 2490 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2491 return PTR_ERR(kt);
c66ac9db
NB		 2492 }
2493 wait_for_completion(&lun->lun_shutdown_comp);
2494
2495 return 0;
2496}
2497
d14921d6
NB		 2498/**
2499 * transport_wait_for_tasks - wait for completion to occur
2500 * @cmd: command to wait
c66ac9db 2501 *
d14921d6
NB		 2502 * Called from frontend fabric context to wait for storage engine
2503 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2504 */
a17f091d 2505bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2506{
2507 unsigned long flags;
2508
a1d8b49a 2509 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2510 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2511 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2513 return false;
d14921d6 2514 }
cb4f4d3c 2515
c8e31f26
AG		 2516 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2517 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2518 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2519 return false;
d14921d6 2520 }
7d680f3b 2521
3d28934a 2522 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2523 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2524 return false;
d14921d6 2525 }
c66ac9db 2526
7d680f3b 2527 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2528
6708bb27 2529 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2530 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2531 cmd, cmd->se_tfo->get_task_tag(cmd),
2532 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2533
a1d8b49a 2534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2535
a1d8b49a 2536 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2537
a1d8b49a 2538 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2539 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2540
35d1efe8 2541 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2542 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2543 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2544
d14921d6 2545 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2546
2547 return true;
c66ac9db 2548}
d14921d6 2549EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2550
2551static int transport_get_sense_codes(
2552 struct se_cmd *cmd,
2553 u8 *asc,
2554 u8 *ascq)
2555{
2556 *asc = cmd->scsi_asc;
2557 *ascq = cmd->scsi_ascq;
2558
2559 return 0;
2560}
2561
76736db3
SG		 2562static
2563void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2564{
2565 /* Place failed LBA in sense data information descriptor 0. */
2566 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2567 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2568 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2569 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2570
2571 /* Descriptor Information: failing sector */
2572 put_unaligned_be64(bad_sector, &buffer[12]);
2573}
2574
de103c93
CH		 2575int
2576transport_send_check_condition_and_sense(struct se_cmd *cmd,
2577 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2578{
2579 unsigned char *buffer = cmd->sense_buffer;
2580 unsigned long flags;
c66ac9db
NB		 2581 u8 asc = 0, ascq = 0;
2582
a1d8b49a 2583 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2584 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2586 return 0;
2587 }
2588 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2590
2591 if (!reason && from_transport)
2592 goto after_reason;
2593
2594 if (!from_transport)
2595 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2596
c66ac9db
NB		 2597 /*
2598 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2599 * SENSE KEY values from include/scsi/scsi.h
2600 */
2601 switch (reason) {
ba829137
HR		 2602 case TCM_NO_SENSE:
2603 /* CURRENT ERROR */
2604 buffer[0] = 0x70;
2605 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2606 /* Not Ready */
2607 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2608 /* NO ADDITIONAL SENSE INFORMATION */
2609 buffer[SPC_ASC_KEY_OFFSET] = 0;
2610 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2611 break;
c66ac9db 2612 case TCM_NON_EXISTENT_LUN:
eb39d340 2613 /* CURRENT ERROR */
9c58b7dd
RD		 2614 buffer[0] = 0x70;
2615 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2616 /* ILLEGAL REQUEST */
9c58b7dd 2617 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2618 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2619 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2620 break;
c66ac9db
NB		 2621 case TCM_UNSUPPORTED_SCSI_OPCODE:
2622 case TCM_SECTOR_COUNT_TOO_MANY:
2623 /* CURRENT ERROR */
9c58b7dd
RD		 2624 buffer[0] = 0x70;
2625 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2626 /* ILLEGAL REQUEST */
9c58b7dd 2627 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2628 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2629 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2630 break;
2631 case TCM_UNKNOWN_MODE_PAGE:
2632 /* CURRENT ERROR */
9c58b7dd
RD		 2633 buffer[0] = 0x70;
2634 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2635 /* ILLEGAL REQUEST */
9c58b7dd 2636 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2637 /* INVALID FIELD IN CDB */
9c58b7dd 2638 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2639 break;
2640 case TCM_CHECK_CONDITION_ABORT_CMD:
2641 /* CURRENT ERROR */
9c58b7dd
RD		 2642 buffer[0] = 0x70;
2643 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2644 /* ABORTED COMMAND */
9c58b7dd 2645 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2646 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2647 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2648 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2649 break;
2650 case TCM_INCORRECT_AMOUNT_OF_DATA:
2651 /* CURRENT ERROR */
9c58b7dd
RD		 2652 buffer[0] = 0x70;
2653 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2654 /* ABORTED COMMAND */
9c58b7dd 2655 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2656 /* WRITE ERROR */
9c58b7dd 2657 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2658 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2659 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2660 break;
2661 case TCM_INVALID_CDB_FIELD:
2662 /* CURRENT ERROR */
9c58b7dd
RD		 2663 buffer[0] = 0x70;
2664 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2665 /* ILLEGAL REQUEST */
9c58b7dd 2666 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2667 /* INVALID FIELD IN CDB */
9c58b7dd 2668 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2669 break;
2670 case TCM_INVALID_PARAMETER_LIST:
2671 /* CURRENT ERROR */
9c58b7dd
RD		 2672 buffer[0] = 0x70;
2673 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2674 /* ILLEGAL REQUEST */
9c58b7dd 2675 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2676 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2677 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2678 break;
bb992e72
RD		 2679 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2680 /* CURRENT ERROR */
2681 buffer[0] = 0x70;
2682 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2683 /* ILLEGAL REQUEST */
2684 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2685 /* PARAMETER LIST LENGTH ERROR */
2686 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2687 break;
c66ac9db
NB		 2688 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2689 /* CURRENT ERROR */
9c58b7dd
RD		 2690 buffer[0] = 0x70;
2691 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2692 /* ABORTED COMMAND */
9c58b7dd 2693 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2694 /* WRITE ERROR */
9c58b7dd 2695 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2696 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2697 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2698 break;
2699 case TCM_SERVICE_CRC_ERROR:
2700 /* CURRENT ERROR */
9c58b7dd
RD		 2701 buffer[0] = 0x70;
2702 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2703 /* ABORTED COMMAND */
9c58b7dd 2704 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2705 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2706 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2707 /* N/A */
9c58b7dd 2708 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2709 break;
2710 case TCM_SNACK_REJECTED:
2711 /* CURRENT ERROR */
9c58b7dd
RD		 2712 buffer[0] = 0x70;
2713 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2714 /* ABORTED COMMAND */
9c58b7dd 2715 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2716 /* READ ERROR */
9c58b7dd 2717 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2718 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2719 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2720 break;
2721 case TCM_WRITE_PROTECTED:
2722 /* CURRENT ERROR */
9c58b7dd
RD		 2723 buffer[0] = 0x70;
2724 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2725 /* DATA PROTECT */
9c58b7dd 2726 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2727 /* WRITE PROTECTED */
9c58b7dd 2728 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2729 break;
e2397c70
RD		 2730 case TCM_ADDRESS_OUT_OF_RANGE:
2731 /* CURRENT ERROR */
9c58b7dd
RD		 2732 buffer[0] = 0x70;
2733 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2734 /* ILLEGAL REQUEST */
9c58b7dd 2735 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2736 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2737 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2738 break;
c66ac9db
NB		 2739 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2740 /* CURRENT ERROR */
9c58b7dd
RD		 2741 buffer[0] = 0x70;
2742 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2743 /* UNIT ATTENTION */
9c58b7dd 2744 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2745 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2746 buffer[SPC_ASC_KEY_OFFSET] = asc;
2747 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2748 break;
2749 case TCM_CHECK_CONDITION_NOT_READY:
2750 /* CURRENT ERROR */
9c58b7dd
RD		 2751 buffer[0] = 0x70;
2752 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2753 /* Not Ready */
9c58b7dd 2754 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2755 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2756 buffer[SPC_ASC_KEY_OFFSET] = asc;
2757 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2758 break;
818b571c
NB		 2759 case TCM_MISCOMPARE_VERIFY:
2760 /* CURRENT ERROR */
2761 buffer[0] = 0x70;
2762 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2763 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2764 /* MISCOMPARE DURING VERIFY OPERATION */
2765 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2766 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2767 break;
fcc4f17b
NB		 2768 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2769 /* CURRENT ERROR */
2770 buffer[0] = 0x70;
2771 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2772 /* ILLEGAL REQUEST */
2773 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2774 /* LOGICAL BLOCK GUARD CHECK FAILED */
2775 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2776 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
76736db3 2777 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2778 break;
2779 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2780 /* CURRENT ERROR */
2781 buffer[0] = 0x70;
2782 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2783 /* ILLEGAL REQUEST */
2784 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2785 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2786 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2787 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
76736db3 2788 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2789 break;
2790 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2791 /* CURRENT ERROR */
2792 buffer[0] = 0x70;
2793 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2794 /* ILLEGAL REQUEST */
2795 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2796 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2797 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2798 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
76736db3 2799 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b 2800 break;
c66ac9db
NB		 2801 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2802 default:
2803 /* CURRENT ERROR */
9c58b7dd
RD		 2804 buffer[0] = 0x70;
2805 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2806 /*
2807 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2808 * Solaris initiators. Returning NOT READY instead means the
2809 * operations will be retried a finite number of times and we
2810 * can survive intermittent errors.
2811 */
2812 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2813 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2814 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2815 break;
2816 }
2817 /*
2818 * This code uses linux/include/scsi/scsi.h SAM status codes!
2819 */
2820 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2821 /*
2822 * Automatically padded, this value is encoded in the fabric's
2823 * data_length response PDU containing the SCSI defined sense data.
2824 */
9c58b7dd 2825 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2826
2827after_reason:
e5c0d6ad 2828 trace_target_cmd_complete(cmd);
07bde79a 2829 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2830}
2831EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2832
2833int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2834{
c18bc7d8
RD		 2835 if (!(cmd->transport_state & CMD_T_ABORTED))
2836 return 0;
c66ac9db 2837
68259b5a
AL		 2838 /*
2839 * If cmd has been aborted but either no status is to be sent or it has
2840 * already been sent, just return
2841 */
2842 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2843 return 1;
8b1e1244 2844
c18bc7d8
RD		 2845 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2846 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2847
68259b5a 2848 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2849 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2850 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2851 cmd->se_tfo->queue_status(cmd);
2852
2853 return 1;
c66ac9db
NB		 2854}
2855EXPORT_SYMBOL(transport_check_aborted_status);
2856
2857void transport_send_task_abort(struct se_cmd *cmd)
2858{
c252f003
NB		 2859 unsigned long flags;
2860
2861 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2862 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2863 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2864 return;
2865 }
2866 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2867
c66ac9db
NB		 2868 /*
2869 * If there are still expected incoming fabric WRITEs, we wait
2870 * until until they have completed before sending a TASK_ABORTED
2871 * response. This response with TASK_ABORTED status will be
2872 * queued back to fabric module by transport_check_aborted_status().
2873 */
2874 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2875 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2876 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 2877 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c66ac9db 2878 smp_mb__after_atomic_inc();
29f4c090 2879 return;
c66ac9db
NB		 2880 }
2881 }
2882 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2883
72b59d6e
RD		 2884 transport_lun_remove_cmd(cmd);
2885
6708bb27 2886 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2887 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2888 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2889
e5c0d6ad 2890 trace_target_cmd_complete(cmd);
e3d6f909 2891 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2892}
2893
af877292 2894static void target_tmr_work(struct work_struct *work)
c66ac9db 2895{
af877292 2896 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2897 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2898 struct se_tmr_req *tmr = cmd->se_tmr_req;
2899 int ret;
2900
2901 switch (tmr->function) {
5c6cd613 2902 case TMR_ABORT_TASK:
3d28934a 2903 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2904 break;
5c6cd613
NB		 2905 case TMR_ABORT_TASK_SET:
2906 case TMR_CLEAR_ACA:
2907 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2908 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2909 break;
5c6cd613 2910 case TMR_LUN_RESET:
c66ac9db
NB		 2911 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2912 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2913 TMR_FUNCTION_REJECTED;
2914 break;
5c6cd613 2915 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2916 tmr->response = TMR_FUNCTION_REJECTED;
2917 break;
5c6cd613 2918 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2919 tmr->response = TMR_FUNCTION_REJECTED;
2920 break;
c66ac9db 2921 default:
6708bb27 2922 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2923 tmr->function);
2924 tmr->response = TMR_FUNCTION_REJECTED;
2925 break;
2926 }
2927
2928 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2929 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2930
b7b8bef7 2931 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2932}
2933
af877292
CH		 2934int transport_generic_handle_tmr(
2935 struct se_cmd *cmd)
c66ac9db 2936{
af877292
CH		 2937 INIT_WORK(&cmd->work, target_tmr_work);
2938 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2939 return 0;
2940}
af877292 2941EXPORT_SYMBOL(transport_generic_handle_tmr);
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