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[mirror_ubuntu-artful-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
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
238struct se_session *transport_init_session(void)
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);
c66ac9db
NB		 254
255 return se_sess;
256}
257EXPORT_SYMBOL(transport_init_session);
258
c0add7fd
NB		 259int transport_alloc_session_tags(struct se_session *se_sess,
260 unsigned int tag_num, unsigned int tag_size)
261{
262 int rc;
263
8c7f6e9b
NB		 264 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
265 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 266 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 267 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
268 if (!se_sess->sess_cmd_map) {
269 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
270 return -ENOMEM;
271 }
c0add7fd
NB		 272 }
273
274 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
275 if (rc < 0) {
276 pr_err("Unable to init se_sess->sess_tag_pool,"
277 " tag_num: %u\n", tag_num);
8c7f6e9b
NB		 278 if (is_vmalloc_addr(se_sess->sess_cmd_map))
279 vfree(se_sess->sess_cmd_map);
280 else
281 kfree(se_sess->sess_cmd_map);
c0add7fd
NB		 282 se_sess->sess_cmd_map = NULL;
283 return -ENOMEM;
284 }
285
286 return 0;
287}
288EXPORT_SYMBOL(transport_alloc_session_tags);
289
290struct se_session *transport_init_session_tags(unsigned int tag_num,
291 unsigned int tag_size)
292{
293 struct se_session *se_sess;
294 int rc;
295
296 se_sess = transport_init_session();
297 if (IS_ERR(se_sess))
298 return se_sess;
299
300 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
301 if (rc < 0) {
302 transport_free_session(se_sess);
303 return ERR_PTR(-ENOMEM);
304 }
305
306 return se_sess;
307}
308EXPORT_SYMBOL(transport_init_session_tags);
309
c66ac9db 310/*
140854cb 311 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 312 */
313void __transport_register_session(
314 struct se_portal_group *se_tpg,
315 struct se_node_acl *se_nacl,
316 struct se_session *se_sess,
317 void *fabric_sess_ptr)
318{
319 unsigned char buf[PR_REG_ISID_LEN];
320
321 se_sess->se_tpg = se_tpg;
322 se_sess->fabric_sess_ptr = fabric_sess_ptr;
323 /*
324 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
325 *
326 * Only set for struct se_session's that will actually be moving I/O.
327 * eg: *NOT* discovery sessions.
328 */
329 if (se_nacl) {
330 /*
331 * If the fabric module supports an ISID based TransportID,
332 * save this value in binary from the fabric I_T Nexus now.
333 */
e3d6f909 334 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 335 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 336 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 337 &buf[0], PR_REG_ISID_LEN);
338 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
339 }
afb999ff
NB		 340 kref_get(&se_nacl->acl_kref);
341
c66ac9db
NB		 342 spin_lock_irq(&se_nacl->nacl_sess_lock);
343 /*
344 * The se_nacl->nacl_sess pointer will be set to the
345 * last active I_T Nexus for each struct se_node_acl.
346 */
347 se_nacl->nacl_sess = se_sess;
348
349 list_add_tail(&se_sess->sess_acl_list,
350 &se_nacl->acl_sess_list);
351 spin_unlock_irq(&se_nacl->nacl_sess_lock);
352 }
353 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
354
6708bb27 355 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 356 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 357}
358EXPORT_SYMBOL(__transport_register_session);
359
360void transport_register_session(
361 struct se_portal_group *se_tpg,
362 struct se_node_acl *se_nacl,
363 struct se_session *se_sess,
364 void *fabric_sess_ptr)
365{
140854cb
NB		 366 unsigned long flags;
367
368 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 369 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 370 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 371}
372EXPORT_SYMBOL(transport_register_session);
373
ecf0dd66 374static void target_release_session(struct kref *kref)
41ac82b6
NB		 375{
376 struct se_session *se_sess = container_of(kref,
377 struct se_session, sess_kref);
378 struct se_portal_group *se_tpg = se_sess->se_tpg;
379
380 se_tpg->se_tpg_tfo->close_session(se_sess);
381}
382
383void target_get_session(struct se_session *se_sess)
384{
385 kref_get(&se_sess->sess_kref);
386}
387EXPORT_SYMBOL(target_get_session);
388
33933a0e 389void target_put_session(struct se_session *se_sess)
41ac82b6 390{
4149268e
JE		 391 struct se_portal_group *tpg = se_sess->se_tpg;
392
393 if (tpg->se_tpg_tfo->put_session != NULL) {
394 tpg->se_tpg_tfo->put_session(se_sess);
395 return;
396 }
33933a0e 397 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 398}
399EXPORT_SYMBOL(target_put_session);
400
afb999ff
NB		 401static void target_complete_nacl(struct kref *kref)
402{
403 struct se_node_acl *nacl = container_of(kref,
404 struct se_node_acl, acl_kref);
405
406 complete(&nacl->acl_free_comp);
407}
408
409void target_put_nacl(struct se_node_acl *nacl)
410{
411 kref_put(&nacl->acl_kref, target_complete_nacl);
412}
413
c66ac9db
NB		 414void transport_deregister_session_configfs(struct se_session *se_sess)
415{
416 struct se_node_acl *se_nacl;
23388864 417 unsigned long flags;
c66ac9db
NB		 418 /*
419 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
420 */
421 se_nacl = se_sess->se_node_acl;
6708bb27 422 if (se_nacl) {
23388864 423 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 424 if (se_nacl->acl_stop == 0)
425 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 426 /*
427 * If the session list is empty, then clear the pointer.
428 * Otherwise, set the struct se_session pointer from the tail
429 * element of the per struct se_node_acl active session list.
430 */
431 if (list_empty(&se_nacl->acl_sess_list))
432 se_nacl->nacl_sess = NULL;
433 else {
434 se_nacl->nacl_sess = container_of(
435 se_nacl->acl_sess_list.prev,
436 struct se_session, sess_acl_list);
437 }
23388864 438 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 439 }
440}
441EXPORT_SYMBOL(transport_deregister_session_configfs);
442
443void transport_free_session(struct se_session *se_sess)
444{
c0add7fd
NB		 445 if (se_sess->sess_cmd_map) {
446 percpu_ida_destroy(&se_sess->sess_tag_pool);
8c7f6e9b
NB		 447 if (is_vmalloc_addr(se_sess->sess_cmd_map))
448 vfree(se_sess->sess_cmd_map);
449 else
450 kfree(se_sess->sess_cmd_map);
c0add7fd 451 }
c66ac9db
NB		 452 kmem_cache_free(se_sess_cache, se_sess);
453}
454EXPORT_SYMBOL(transport_free_session);
455
456void transport_deregister_session(struct se_session *se_sess)
457{
458 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 459 struct target_core_fabric_ops *se_tfo;
c66ac9db 460 struct se_node_acl *se_nacl;
e63a8e19 461 unsigned long flags;
01468346 462 bool comp_nacl = true;
c66ac9db 463
6708bb27 464 if (!se_tpg) {
c66ac9db
NB		 465 transport_free_session(se_sess);
466 return;
467 }
01468346 468 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 469
e63a8e19 470 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 471 list_del(&se_sess->sess_list);
472 se_sess->se_tpg = NULL;
473 se_sess->fabric_sess_ptr = NULL;
e63a8e19 474 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 475
476 /*
477 * Determine if we need to do extra work for this initiator node's
478 * struct se_node_acl if it had been previously dynamically generated.
479 */
480 se_nacl = se_sess->se_node_acl;
01468346
NB		 481
482 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
483 if (se_nacl && se_nacl->dynamic_node_acl) {
484 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
485 list_del(&se_nacl->acl_list);
486 se_tpg->num_node_acls--;
487 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
488 core_tpg_wait_for_nacl_pr_ref(se_nacl);
489 core_free_device_list_for_node(se_nacl, se_tpg);
490 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
491
492 comp_nacl = false;
493 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 494 }
c66ac9db 495 }
01468346 496 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 497
6708bb27 498 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 499 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 500 /*
125d0119 501 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 502 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
503 * removal context.
01468346
NB		 504 */
505 if (se_nacl && comp_nacl == true)
afb999ff 506 target_put_nacl(se_nacl);
01468346 507
afb999ff 508 transport_free_session(se_sess);
c66ac9db
NB		 509}
510EXPORT_SYMBOL(transport_deregister_session);
511
512/*
a1d8b49a 513 * Called with cmd->t_state_lock held.
c66ac9db 514 */
cf572a96 515static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 516{
42bf829e 517 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 518 unsigned long flags;
519
42bf829e
CH		 520 if (!dev)
521 return;
c66ac9db 522
cf572a96
CH		 523 if (cmd->transport_state & CMD_T_BUSY)
524 return;
c66ac9db 525
cf572a96
CH		 526 spin_lock_irqsave(&dev->execute_task_lock, flags);
527 if (cmd->state_active) {
528 list_del(&cmd->state_list);
cf572a96 529 cmd->state_active = false;
c66ac9db 530 }
cf572a96 531 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 532}
533
862e6389
NB		 534static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
535 bool write_pending)
c66ac9db
NB		 536{
537 unsigned long flags;
538
a1d8b49a 539 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 540 if (write_pending)
541 cmd->t_state = TRANSPORT_WRITE_PENDING;
542
f7113a47
CH		 543 if (remove_from_lists) {
544 target_remove_from_state_list(cmd);
545
546 /*
547 * Clear struct se_cmd->se_lun before the handoff to FE.
548 */
549 cmd->se_lun = NULL;
550 }
551
c66ac9db
NB		 552 /*
553 * Determine if frontend context caller is requesting the stopping of
e3d6f909 554 * this command for frontend exceptions.
c66ac9db 555 */
7d680f3b
CH		 556 if (cmd->transport_state & CMD_T_STOP) {
557 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
558 __func__, __LINE__,
e3d6f909 559 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 560
a1d8b49a 561 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 562
a1d8b49a 563 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 564 return 1;
565 }
f7113a47
CH		 566
567 cmd->transport_state &= ~CMD_T_ACTIVE;
568 if (remove_from_lists) {
569 /*
570 * Some fabric modules like tcm_loop can release
571 * their internally allocated I/O reference now and
572 * struct se_cmd now.
573 *
574 * Fabric modules are expected to return '1' here if the
575 * se_cmd being passed is released at this point,
576 * or zero if not being released.
577 */
578 if (cmd->se_tfo->check_stop_free != NULL) {
579 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
580 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 581 }
f7113a47 582 }
c66ac9db 583
a1d8b49a 584 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 585 return 0;
586}
587
588static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
589{
862e6389 590 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 591}
592
593static void transport_lun_remove_cmd(struct se_cmd *cmd)
594{
e3d6f909 595 struct se_lun *lun = cmd->se_lun;
c66ac9db 596
5259a06e 597 if (!lun)
c66ac9db
NB		 598 return;
599
5259a06e
NB		 600 if (cmpxchg(&cmd->lun_ref_active, true, false))
601 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 602}
603
604void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
605{
c66ac9db
NB		 606 if (transport_cmd_check_stop_to_fabric(cmd))
607 return;
af877292 608 if (remove)
e6a2573f 609 transport_put_cmd(cmd);
c66ac9db
NB		 610}
611
35e0e757
CH		 612static void target_complete_failure_work(struct work_struct *work)
613{
614 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
615
de103c93
CH		 616 transport_generic_request_failure(cmd,
617 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 618}
619
6138ed2a 620/*
d5829eac
PB		 621 * Used when asking transport to copy Sense Data from the underlying
622 * Linux/SCSI struct scsi_cmnd
6138ed2a 623 */
d5829eac 624static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 625{
6138ed2a 626 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 627
628 WARN_ON(!cmd->se_lun);
629
630 if (!dev)
d5829eac 631 return NULL;
6138ed2a 632
d5829eac
PB		 633 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
634 return NULL;
6138ed2a 635
9c58b7dd 636 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 637
d5829eac 638 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 639 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 640 return cmd->sense_buffer;
6138ed2a
PB		 641}
642
5787cacd 643void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 644{
42bf829e 645 struct se_device *dev = cmd->se_dev;
5787cacd 646 int success = scsi_status == GOOD;
c66ac9db 647 unsigned long flags;
c66ac9db 648
5787cacd
CH		 649 cmd->scsi_status = scsi_status;
650
651
a1d8b49a 652 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 653 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 654
c66ac9db 655 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 656 dev->transport->transport_complete(cmd,
657 cmd->t_data_sg,
658 transport_get_sense_buffer(cmd));
659 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 660 success = 1;
c66ac9db
NB		 661 }
662
663 /*
5787cacd 664 * See if we are waiting to complete for an exception condition.
c66ac9db 665 */
cf572a96 666 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 667 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 668 complete(&cmd->task_stop_comp);
c66ac9db
NB		 669 return;
670 }
2235007c 671
3d28934a 672 /*
125d0119 673 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 674 * and transport_wait_for_tasks() will be waiting for completion..
675 */
676 if (cmd->transport_state & CMD_T_ABORTED &&
677 cmd->transport_state & CMD_T_STOP) {
678 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
679 complete(&cmd->t_transport_stop_comp);
680 return;
3dca1471 681 } else if (!success) {
35e0e757 682 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 683 } else {
35e0e757 684 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 685 }
35e0e757 686
35e0e757 687 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 688 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 689 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 690
35e0e757 691 queue_work(target_completion_wq, &cmd->work);
c66ac9db 692}
6bb35e00
CH		 693EXPORT_SYMBOL(target_complete_cmd);
694
cf572a96 695static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 696{
cf572a96
CH		 697 struct se_device *dev = cmd->se_dev;
698 unsigned long flags;
c66ac9db 699
cf572a96
CH		 700 spin_lock_irqsave(&dev->execute_task_lock, flags);
701 if (!cmd->state_active) {
702 list_add_tail(&cmd->state_list, &dev->state_list);
703 cmd->state_active = true;
c66ac9db 704 }
cf572a96 705 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 706}
707
07bde79a 708/*
f147abb4 709 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 710 */
7a6f0a1e
CH		 711static void transport_write_pending_qf(struct se_cmd *cmd);
712static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 713
0fd97ccf 714void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 715{
716 struct se_device *dev = container_of(work, struct se_device,
717 qf_work_queue);
bcac364a 718 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 719 struct se_cmd *cmd, *cmd_tmp;
720
721 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 722 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
723 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 724
bcac364a 725 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 726 list_del(&cmd->se_qf_node);
727 atomic_dec(&dev->dev_qf_count);
728 smp_mb__after_atomic_dec();
07bde79a 729
6708bb27 730 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 731 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 732 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 733 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
734 : "UNKNOWN");
f7a5cc0b 735
7a6f0a1e
CH		 736 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
737 transport_write_pending_qf(cmd);
738 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
739 transport_complete_qf(cmd);
07bde79a 740 }
07bde79a
NB		 741}
742
c66ac9db
NB		 743unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
744{
745 switch (cmd->data_direction) {
746 case DMA_NONE:
747 return "NONE";
748 case DMA_FROM_DEVICE:
749 return "READ";
750 case DMA_TO_DEVICE:
751 return "WRITE";
752 case DMA_BIDIRECTIONAL:
753 return "BIDI";
754 default:
755 break;
756 }
757
758 return "UNKNOWN";
759}
760
761void transport_dump_dev_state(
762 struct se_device *dev,
763 char *b,
764 int *bl)
765{
766 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 767 if (dev->export_count)
c66ac9db 768 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 769 else
c66ac9db 770 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 771
5f41a31d 772 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 773 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 774 dev->dev_attrib.block_size,
775 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 776 *bl += sprintf(b + *bl, " ");
777}
778
c66ac9db
NB		 779void transport_dump_vpd_proto_id(
780 struct t10_vpd *vpd,
781 unsigned char *p_buf,
782 int p_buf_len)
783{
784 unsigned char buf[VPD_TMP_BUF_SIZE];
785 int len;
786
787 memset(buf, 0, VPD_TMP_BUF_SIZE);
788 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
789
790 switch (vpd->protocol_identifier) {
791 case 0x00:
792 sprintf(buf+len, "Fibre Channel\n");
793 break;
794 case 0x10:
795 sprintf(buf+len, "Parallel SCSI\n");
796 break;
797 case 0x20:
798 sprintf(buf+len, "SSA\n");
799 break;
800 case 0x30:
801 sprintf(buf+len, "IEEE 1394\n");
802 break;
803 case 0x40:
804 sprintf(buf+len, "SCSI Remote Direct Memory Access"
805 " Protocol\n");
806 break;
807 case 0x50:
808 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
809 break;
810 case 0x60:
811 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
812 break;
813 case 0x70:
814 sprintf(buf+len, "Automation/Drive Interface Transport"
815 " Protocol\n");
816 break;
817 case 0x80:
818 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
819 break;
820 default:
821 sprintf(buf+len, "Unknown 0x%02x\n",
822 vpd->protocol_identifier);
823 break;
824 }
825
826 if (p_buf)
827 strncpy(p_buf, buf, p_buf_len);
828 else
6708bb27 829 pr_debug("%s", buf);
c66ac9db
NB		 830}
831
832void
833transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
834{
835 /*
836 * Check if the Protocol Identifier Valid (PIV) bit is set..
837 *
838 * from spc3r23.pdf section 7.5.1
839 */
840 if (page_83[1] & 0x80) {
841 vpd->protocol_identifier = (page_83[0] & 0xf0);
842 vpd->protocol_identifier_set = 1;
843 transport_dump_vpd_proto_id(vpd, NULL, 0);
844 }
845}
846EXPORT_SYMBOL(transport_set_vpd_proto_id);
847
848int transport_dump_vpd_assoc(
849 struct t10_vpd *vpd,
850 unsigned char *p_buf,
851 int p_buf_len)
852{
853 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 854 int ret = 0;
855 int len;
c66ac9db
NB		 856
857 memset(buf, 0, VPD_TMP_BUF_SIZE);
858 len = sprintf(buf, "T10 VPD Identifier Association: ");
859
860 switch (vpd->association) {
861 case 0x00:
862 sprintf(buf+len, "addressed logical unit\n");
863 break;
864 case 0x10:
865 sprintf(buf+len, "target port\n");
866 break;
867 case 0x20:
868 sprintf(buf+len, "SCSI target device\n");
869 break;
870 default:
871 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 872 ret = -EINVAL;
c66ac9db
NB		 873 break;
874 }
875
876 if (p_buf)
877 strncpy(p_buf, buf, p_buf_len);
878 else
6708bb27 879 pr_debug("%s", buf);
c66ac9db
NB		 880
881 return ret;
882}
883
884int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
885{
886 /*
887 * The VPD identification association..
888 *
889 * from spc3r23.pdf Section 7.6.3.1 Table 297
890 */
891 vpd->association = (page_83[1] & 0x30);
892 return transport_dump_vpd_assoc(vpd, NULL, 0);
893}
894EXPORT_SYMBOL(transport_set_vpd_assoc);
895
896int transport_dump_vpd_ident_type(
897 struct t10_vpd *vpd,
898 unsigned char *p_buf,
899 int p_buf_len)
900{
901 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 902 int ret = 0;
903 int len;
c66ac9db
NB		 904
905 memset(buf, 0, VPD_TMP_BUF_SIZE);
906 len = sprintf(buf, "T10 VPD Identifier Type: ");
907
908 switch (vpd->device_identifier_type) {
909 case 0x00:
910 sprintf(buf+len, "Vendor specific\n");
911 break;
912 case 0x01:
913 sprintf(buf+len, "T10 Vendor ID based\n");
914 break;
915 case 0x02:
916 sprintf(buf+len, "EUI-64 based\n");
917 break;
918 case 0x03:
919 sprintf(buf+len, "NAA\n");
920 break;
921 case 0x04:
922 sprintf(buf+len, "Relative target port identifier\n");
923 break;
924 case 0x08:
925 sprintf(buf+len, "SCSI name string\n");
926 break;
927 default:
928 sprintf(buf+len, "Unsupported: 0x%02x\n",
929 vpd->device_identifier_type);
e3d6f909 930 ret = -EINVAL;
c66ac9db
NB		 931 break;
932 }
933
e3d6f909
AG		 934 if (p_buf) {
935 if (p_buf_len < strlen(buf)+1)
936 return -EINVAL;
c66ac9db 937 strncpy(p_buf, buf, p_buf_len);
e3d6f909 938 } else {
6708bb27 939 pr_debug("%s", buf);
e3d6f909 940 }
c66ac9db
NB		 941
942 return ret;
943}
944
945int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
946{
947 /*
948 * The VPD identifier type..
949 *
950 * from spc3r23.pdf Section 7.6.3.1 Table 298
951 */
952 vpd->device_identifier_type = (page_83[1] & 0x0f);
953 return transport_dump_vpd_ident_type(vpd, NULL, 0);
954}
955EXPORT_SYMBOL(transport_set_vpd_ident_type);
956
957int transport_dump_vpd_ident(
958 struct t10_vpd *vpd,
959 unsigned char *p_buf,
960 int p_buf_len)
961{
962 unsigned char buf[VPD_TMP_BUF_SIZE];
963 int ret = 0;
964
965 memset(buf, 0, VPD_TMP_BUF_SIZE);
966
967 switch (vpd->device_identifier_code_set) {
968 case 0x01: /* Binary */
703d641d
DC		 969 snprintf(buf, sizeof(buf),
970 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 971 &vpd->device_identifier[0]);
972 break;
973 case 0x02: /* ASCII */
703d641d
DC		 974 snprintf(buf, sizeof(buf),
975 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 976 &vpd->device_identifier[0]);
977 break;
978 case 0x03: /* UTF-8 */
703d641d
DC		 979 snprintf(buf, sizeof(buf),
980 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 981 &vpd->device_identifier[0]);
982 break;
983 default:
984 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
985 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 986 ret = -EINVAL;
c66ac9db
NB		 987 break;
988 }
989
990 if (p_buf)
991 strncpy(p_buf, buf, p_buf_len);
992 else
6708bb27 993 pr_debug("%s", buf);
c66ac9db
NB		 994
995 return ret;
996}
997
998int
999transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1000{
1001 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1002 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1003
1004 /*
1005 * The VPD Code Set (encoding)
1006 *
1007 * from spc3r23.pdf Section 7.6.3.1 Table 296
1008 */
1009 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1010 switch (vpd->device_identifier_code_set) {
1011 case 0x01: /* Binary */
1012 vpd->device_identifier[j++] =
1013 hex_str[vpd->device_identifier_type];
1014 while (i < (4 + page_83[3])) {
1015 vpd->device_identifier[j++] =
1016 hex_str[(page_83[i] & 0xf0) >> 4];
1017 vpd->device_identifier[j++] =
1018 hex_str[page_83[i] & 0x0f];
1019 i++;
1020 }
1021 break;
1022 case 0x02: /* ASCII */
1023 case 0x03: /* UTF-8 */
1024 while (i < (4 + page_83[3]))
1025 vpd->device_identifier[j++] = page_83[i++];
1026 break;
1027 default:
1028 break;
1029 }
1030
1031 return transport_dump_vpd_ident(vpd, NULL, 0);
1032}
1033EXPORT_SYMBOL(transport_set_vpd_ident);
1034
de103c93
CH		 1035sense_reason_t
1036target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1037{
1038 struct se_device *dev = cmd->se_dev;
1039
1040 if (cmd->unknown_data_length) {
1041 cmd->data_length = size;
1042 } else if (size != cmd->data_length) {
1043 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1044 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1045 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1046 cmd->data_length, size, cmd->t_task_cdb[0]);
1047
9b3b8041
CH		 1048 if (cmd->data_direction == DMA_TO_DEVICE) {
1049 pr_err("Rejecting underflow/overflow"
1050 " WRITE data\n");
de103c93 1051 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1052 }
1053 /*
1054 * Reject READ_* or WRITE_* with overflow/underflow for
1055 * type SCF_SCSI_DATA_CDB.
1056 */
0fd97ccf 1057 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1058 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1059 " CDB on non 512-byte sector setup subsystem"
1060 " plugin: %s\n", dev->transport->name);
1061 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1062 return TCM_INVALID_CDB_FIELD;
9b3b8041 1063 }
4c054ba6
NB		 1064 /*
1065 * For the overflow case keep the existing fabric provided
1066 * ->data_length. Otherwise for the underflow case, reset
1067 * ->data_length to the smaller SCSI expected data transfer
1068 * length.
1069 */
9b3b8041
CH		 1070 if (size > cmd->data_length) {
1071 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1072 cmd->residual_count = (size - cmd->data_length);
1073 } else {
1074 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1075 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1076 cmd->data_length = size;
9b3b8041 1077 }
9b3b8041
CH		 1078 }
1079
1080 return 0;
1081
9b3b8041
CH		 1082}
1083
c66ac9db
NB		 1084/*
1085 * Used by fabric modules containing a local struct se_cmd within their
1086 * fabric dependent per I/O descriptor.
1087 */
1088void transport_init_se_cmd(
1089 struct se_cmd *cmd,
1090 struct target_core_fabric_ops *tfo,
1091 struct se_session *se_sess,
1092 u32 data_length,
1093 int data_direction,
1094 int task_attr,
1095 unsigned char *sense_buffer)
1096{
5951146d 1097 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1098 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1099 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1100 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1101 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1102 init_completion(&cmd->cmd_wait_comp);
cf572a96 1103 init_completion(&cmd->task_stop_comp);
a1d8b49a 1104 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1105 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1106
1107 cmd->se_tfo = tfo;
1108 cmd->se_sess = se_sess;
1109 cmd->data_length = data_length;
1110 cmd->data_direction = data_direction;
1111 cmd->sam_task_attr = task_attr;
1112 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1113
1114 cmd->state_active = false;
c66ac9db
NB		 1115}
1116EXPORT_SYMBOL(transport_init_se_cmd);
1117
de103c93
CH		 1118static sense_reason_t
1119transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1120{
019c4ca6
CH		 1121 struct se_device *dev = cmd->se_dev;
1122
c66ac9db
NB		 1123 /*
1124 * Check if SAM Task Attribute emulation is enabled for this
1125 * struct se_device storage object
1126 */
019c4ca6 1127 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1128 return 0;
1129
e66ecd50 1130 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1131 pr_debug("SAM Task Attribute ACA"
c66ac9db 1132 " emulation is not supported\n");
de103c93 1133 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1134 }
1135 /*
1136 * Used to determine when ORDERED commands should go from
1137 * Dormant to Active status.
1138 */
019c4ca6 1139 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1140 smp_mb__after_atomic_inc();
6708bb27 1141 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1142 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1143 dev->transport->name);
c66ac9db
NB		 1144 return 0;
1145}
1146
de103c93
CH		 1147sense_reason_t
1148target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1149{
0fd97ccf 1150 struct se_device *dev = cmd->se_dev;
de103c93 1151 sense_reason_t ret;
c66ac9db 1152
c66ac9db
NB		 1153 /*
1154 * Ensure that the received CDB is less than the max (252 + 8) bytes
1155 * for VARIABLE_LENGTH_CMD
1156 */
1157 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1158 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1159 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1160 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1161 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1162 }
1163 /*
1164 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1165 * allocate the additional extended CDB buffer now.. Otherwise
1166 * setup the pointer from __t_task_cdb to t_task_cdb.
1167 */
a1d8b49a
AG		 1168 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1169 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1170 GFP_KERNEL);
6708bb27
AG		 1171 if (!cmd->t_task_cdb) {
1172 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1173 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1174 scsi_command_size(cdb),
a1d8b49a 1175 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1176 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1177 }
1178 } else
a1d8b49a 1179 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1180 /*
a1d8b49a 1181 * Copy the original CDB into cmd->
c66ac9db 1182 */
a1d8b49a 1183 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1184
e5c0d6ad
RD		 1185 trace_target_sequencer_start(cmd);
1186
cb4f4d3c
CH		 1187 /*
1188 * Check for an existing UNIT ATTENTION condition
1189 */
de103c93
CH		 1190 ret = target_scsi3_ua_check(cmd);
1191 if (ret)
1192 return ret;
cb4f4d3c 1193
c87fbd56 1194 ret = target_alua_state_check(cmd);
de103c93
CH		 1195 if (ret)
1196 return ret;
cb4f4d3c 1197
d977f437 1198 ret = target_check_reservation(cmd);
f85eda8d
NB		 1199 if (ret) {
1200 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1201 return ret;
f85eda8d 1202 }
cb4f4d3c 1203
0fd97ccf 1204 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1205 if (ret)
1206 return ret;
1207
1208 ret = transport_check_alloc_task_attr(cmd);
1209 if (ret)
c66ac9db 1210 return ret;
cb4f4d3c 1211
cb4f4d3c 1212 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1213
c66ac9db
NB		 1214 spin_lock(&cmd->se_lun->lun_sep_lock);
1215 if (cmd->se_lun->lun_sep)
1216 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1217 spin_unlock(&cmd->se_lun->lun_sep_lock);
1218 return 0;
1219}
a12f41f8 1220EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1221
695434e1
NB		 1222/*
1223 * Used by fabric module frontends to queue tasks directly.
1224 * Many only be used from process context only
1225 */
1226int transport_handle_cdb_direct(
1227 struct se_cmd *cmd)
1228{
de103c93 1229 sense_reason_t ret;
dd8ae59d 1230
695434e1
NB		 1231 if (!cmd->se_lun) {
1232 dump_stack();
6708bb27 1233 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1234 return -EINVAL;
1235 }
1236 if (in_interrupt()) {
1237 dump_stack();
6708bb27 1238 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1239 " from interrupt context\n");
1240 return -EINVAL;
1241 }
dd8ae59d 1242 /*
af877292
CH		 1243 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1244 * outstanding descriptors are handled correctly during shutdown via
1245 * transport_wait_for_tasks()
dd8ae59d
NB		 1246 *
1247 * Also, we don't take cmd->t_state_lock here as we only expect
1248 * this to be called for initial descriptor submission.
1249 */
1250 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1251 cmd->transport_state |= CMD_T_ACTIVE;
1252
dd8ae59d
NB		 1253 /*
1254 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1255 * so follow TRANSPORT_NEW_CMD processing thread context usage
1256 * and call transport_generic_request_failure() if necessary..
1257 */
1258 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1259 if (ret)
1260 transport_generic_request_failure(cmd, ret);
dd8ae59d 1261 return 0;
695434e1
NB		 1262}
1263EXPORT_SYMBOL(transport_handle_cdb_direct);
1264
c5ff8d6b 1265sense_reason_t
de103c93
CH		 1266transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1267 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1268{
1269 if (!sgl || !sgl_count)
1270 return 0;
1271
1272 /*
1273 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1274 * scatterlists already have been set to follow what the fabric
1275 * passes for the original expected data transfer length.
1276 */
1277 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1278 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1279 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1280 return TCM_INVALID_CDB_FIELD;
1281 }
1282
1283 cmd->t_data_sg = sgl;
1284 cmd->t_data_nents = sgl_count;
1285
1286 if (sgl_bidi && sgl_bidi_count) {
1287 cmd->t_bidi_data_sg = sgl_bidi;
1288 cmd->t_bidi_data_nents = sgl_bidi_count;
1289 }
1290 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1291 return 0;
1292}
1293
a026757f
NB		 1294/*
1295 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1296 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1297 *
1298 * @se_cmd: command descriptor to submit
1299 * @se_sess: associated se_sess for endpoint
1300 * @cdb: pointer to SCSI CDB
1301 * @sense: pointer to SCSI sense buffer
1302 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1303 * @data_length: fabric expected data transfer length
1304 * @task_addr: SAM task attribute
1305 * @data_dir: DMA data direction
1306 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1307 * @sgl: struct scatterlist memory for unidirectional mapping
1308 * @sgl_count: scatterlist count for unidirectional mapping
1309 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1310 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1311 * @sgl_prot: struct scatterlist memory protection information
1312 * @sgl_prot_count: scatterlist count for protection information
a6360785 1313 *
d6dfc868
RD		 1314 * Returns non zero to signal active I/O shutdown failure. All other
1315 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1316 * but still return zero here.
1317 *
a6360785
NB		 1318 * This may only be called from process context, and also currently
1319 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1320 */
1321int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1322 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1323 u32 data_length, int task_attr, int data_dir, int flags,
1324 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1325 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1326 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1327{
1328 struct se_portal_group *se_tpg;
de103c93
CH		 1329 sense_reason_t rc;
1330 int ret;
a6360785
NB		 1331
1332 se_tpg = se_sess->se_tpg;
1333 BUG_ON(!se_tpg);
1334 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1335 BUG_ON(in_interrupt());
1336 /*
1337 * Initialize se_cmd for target operation. From this point
1338 * exceptions are handled by sending exception status via
1339 * target_core_fabric_ops->queue_status() callback
1340 */
1341 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1342 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1343 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1344 se_cmd->unknown_data_length = 1;
a6360785
NB		 1345 /*
1346 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1347 * se_sess->sess_cmd_list. A second kref_get here is necessary
1348 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1349 * kref_put() to happen during fabric packet acknowledgement.
1350 */
de103c93
CH		 1351 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1352 if (ret)
1353 return ret;
a6360785
NB		 1354 /*
1355 * Signal bidirectional data payloads to target-core
1356 */
1357 if (flags & TARGET_SCF_BIDI_OP)
1358 se_cmd->se_cmd_flags |= SCF_BIDI;
1359 /*
1360 * Locate se_lun pointer and attach it to struct se_cmd
1361 */
de103c93
CH		 1362 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1363 if (rc) {
1364 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1365 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1366 return 0;
735703ca 1367 }
def2b339
NB		 1368 /*
1369 * Save pointers for SGLs containing protection information,
1370 * if present.
1371 */
1372 if (sgl_prot_count) {
1373 se_cmd->t_prot_sg = sgl_prot;
1374 se_cmd->t_prot_nents = sgl_prot_count;
1375 }
d6e0175c 1376
a12f41f8 1377 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1378 if (rc != 0) {
de103c93 1379 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1380 return 0;
735703ca 1381 }
a026757f
NB		 1382 /*
1383 * When a non zero sgl_count has been passed perform SGL passthrough
1384 * mapping for pre-allocated fabric memory instead of having target
1385 * core perform an internal SGL allocation..
1386 */
1387 if (sgl_count != 0) {
1388 BUG_ON(!sgl);
1389
944981c7
NB		 1390 /*
1391 * A work-around for tcm_loop as some userspace code via
1392 * scsi-generic do not memset their associated read buffers,
1393 * so go ahead and do that here for type non-data CDBs. Also
1394 * note that this is currently guaranteed to be a single SGL
1395 * for this case by target core in target_setup_cmd_from_cdb()
1396 * -> transport_generic_cmd_sequencer().
1397 */
1398 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1399 se_cmd->data_direction == DMA_FROM_DEVICE) {
1400 unsigned char *buf = NULL;
1401
1402 if (sgl)
1403 buf = kmap(sg_page(sgl)) + sgl->offset;
1404
1405 if (buf) {
1406 memset(buf, 0, sgl->length);
1407 kunmap(sg_page(sgl));
1408 }
1409 }
1410
a026757f
NB		 1411 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1412 sgl_bidi, sgl_bidi_count);
1413 if (rc != 0) {
de103c93 1414 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1415 return 0;
1416 }
1417 }
def2b339 1418
11e319ed
AG		 1419 /*
1420 * Check if we need to delay processing because of ALUA
1421 * Active/NonOptimized primary access state..
1422 */
1423 core_alua_check_nonop_delay(se_cmd);
1424
a6360785 1425 transport_handle_cdb_direct(se_cmd);
d6dfc868 1426 return 0;
a6360785 1427}
a026757f
NB		 1428EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1429
1430/*
1431 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1432 *
1433 * @se_cmd: command descriptor to submit
1434 * @se_sess: associated se_sess for endpoint
1435 * @cdb: pointer to SCSI CDB
1436 * @sense: pointer to SCSI sense buffer
1437 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1438 * @data_length: fabric expected data transfer length
1439 * @task_addr: SAM task attribute
1440 * @data_dir: DMA data direction
1441 * @flags: flags for command submission from target_sc_flags_tables
1442 *
1443 * Returns non zero to signal active I/O shutdown failure. All other
1444 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1445 * but still return zero here.
1446 *
1447 * This may only be called from process context, and also currently
1448 * assumes internal allocation of fabric payload buffer by target-core.
1449 *
1450 * It also assumes interal target core SGL memory allocation.
1451 */
1452int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1453 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1454 u32 data_length, int task_attr, int data_dir, int flags)
1455{
1456 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1457 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1458 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1459}
a6360785
NB		 1460EXPORT_SYMBOL(target_submit_cmd);
1461
9f0d05c2
NB		 1462static void target_complete_tmr_failure(struct work_struct *work)
1463{
1464 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1465
1466 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1467 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1468
1469 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1470}
1471
ea98d7f9
AG		 1472/**
1473 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1474 * for TMR CDBs
1475 *
1476 * @se_cmd: command descriptor to submit
1477 * @se_sess: associated se_sess for endpoint
1478 * @sense: pointer to SCSI sense buffer
1479 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1480 * @fabric_context: fabric context for TMR req
1481 * @tm_type: Type of TM request
c0974f89
NB		 1482 * @gfp: gfp type for caller
1483 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1484 * @flags: submit cmd flags
ea98d7f9
AG		 1485 *
1486 * Callable from all contexts.
1487 **/
1488
c7042cae 1489int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1490 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1491 void *fabric_tmr_ptr, unsigned char tm_type,
1492 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1493{
1494 struct se_portal_group *se_tpg;
1495 int ret;
1496
1497 se_tpg = se_sess->se_tpg;
1498 BUG_ON(!se_tpg);
1499
1500 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1501 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1502 /*
1503 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1504 * allocation failure.
1505 */
c0974f89 1506 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1507 if (ret < 0)
1508 return -ENOMEM;
ea98d7f9 1509
c0974f89
NB		 1510 if (tm_type == TMR_ABORT_TASK)
1511 se_cmd->se_tmr_req->ref_task_tag = tag;
1512
ea98d7f9 1513 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1514 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1515 if (ret) {
1516 core_tmr_release_req(se_cmd->se_tmr_req);
1517 return ret;
1518 }
ea98d7f9 1519
ea98d7f9
AG		 1520 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1521 if (ret) {
9f0d05c2
NB		 1522 /*
1523 * For callback during failure handling, push this work off
1524 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1525 */
1526 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1527 schedule_work(&se_cmd->work);
c7042cae 1528 return 0;
ea98d7f9
AG		 1529 }
1530 transport_generic_handle_tmr(se_cmd);
c7042cae 1531 return 0;
ea98d7f9
AG		 1532}
1533EXPORT_SYMBOL(target_submit_tmr);
1534
cdbb70bb 1535/*
cf572a96 1536 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1537 * has completed.
1538 */
cf572a96 1539bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1540{
cdbb70bb
CH		 1541 bool was_active = false;
1542
cf572a96
CH		 1543 if (cmd->transport_state & CMD_T_BUSY) {
1544 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1545 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1546
cf572a96
CH		 1547 pr_debug("cmd %p waiting to complete\n", cmd);
1548 wait_for_completion(&cmd->task_stop_comp);
1549 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1550
1551 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1552 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1553 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1554 was_active = true;
1555 }
1556
cdbb70bb
CH		 1557 return was_active;
1558}
1559
c66ac9db
NB		 1560/*
1561 * Handle SAM-esque emulation for generic transport request failures.
1562 */
de103c93
CH		 1563void transport_generic_request_failure(struct se_cmd *cmd,
1564 sense_reason_t sense_reason)
c66ac9db 1565{
07bde79a
NB		 1566 int ret = 0;
1567
6708bb27 1568 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1569 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1570 cmd->t_task_cdb[0]);
de103c93 1571 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1572 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1573 cmd->t_state, sense_reason);
d43d6aea 1574 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1575 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1576 (cmd->transport_state & CMD_T_STOP) != 0,
1577 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1578
c66ac9db
NB		 1579 /*
1580 * For SAM Task Attribute emulation for failed struct se_cmd
1581 */
019c4ca6 1582 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1583 /*
1584 * Handle special case for COMPARE_AND_WRITE failure, where the
1585 * callback is expected to drop the per device ->caw_mutex.
1586 */
1587 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1588 cmd->transport_complete_callback)
1589 cmd->transport_complete_callback(cmd);
c66ac9db 1590
de103c93 1591 switch (sense_reason) {
03e98c9e
NB		 1592 case TCM_NON_EXISTENT_LUN:
1593 case TCM_UNSUPPORTED_SCSI_OPCODE:
1594 case TCM_INVALID_CDB_FIELD:
1595 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1596 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1597 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1598 case TCM_UNKNOWN_MODE_PAGE:
1599 case TCM_WRITE_PROTECTED:
e2397c70 1600 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1601 case TCM_CHECK_CONDITION_ABORT_CMD:
1602 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1603 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1604 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1605 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1606 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1607 break;
de103c93
CH		 1608 case TCM_OUT_OF_RESOURCES:
1609 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1610 break;
03e98c9e 1611 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1612 /*
1613 * No SENSE Data payload for this case, set SCSI Status
1614 * and queue the response to $FABRIC_MOD.
1615 *
1616 * Uses linux/include/scsi/scsi.h SAM status codes defs
1617 */
1618 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1619 /*
1620 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1621 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1622 * CONFLICT STATUS.
1623 *
1624 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1625 */
e3d6f909 1626 if (cmd->se_sess &&
0fd97ccf 1627 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1628 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1629 cmd->orig_fe_lun, 0x2C,
1630 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1631
e5c0d6ad
RD		 1632 trace_target_cmd_complete(cmd);
1633 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1634 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1635 goto queue_full;
c66ac9db 1636 goto check_stop;
c66ac9db 1637 default:
6708bb27 1638 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1639 cmd->t_task_cdb[0], sense_reason);
1640 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1641 break;
1642 }
f3146437 1643
de103c93 1644 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1645 if (ret == -EAGAIN || ret == -ENOMEM)
1646 goto queue_full;
07bde79a 1647
c66ac9db
NB		 1648check_stop:
1649 transport_lun_remove_cmd(cmd);
6708bb27 1650 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1651 ;
07bde79a
NB		 1652 return;
1653
1654queue_full:
e057f533
CH		 1655 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1656 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1657}
2fbff127 1658EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1659
76dde50e 1660void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1661{
de103c93 1662 sense_reason_t ret;
5f41a31d 1663
de103c93
CH		 1664 if (cmd->execute_cmd) {
1665 ret = cmd->execute_cmd(cmd);
1666 if (ret) {
1667 spin_lock_irq(&cmd->t_state_lock);
1668 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1669 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1670
de103c93
CH		 1671 transport_generic_request_failure(cmd, ret);
1672 }
5f41a31d
CH		 1673 }
1674}
1675
019c4ca6 1676static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1677{
1678 struct se_device *dev = cmd->se_dev;
1679
019c4ca6
CH		 1680 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1681 return false;
5f41a31d 1682
c66ac9db 1683 /*
25985edc 1684 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1685 * to allow the passed struct se_cmd list of tasks to the front of the list.
1686 */
5f41a31d
CH		 1687 switch (cmd->sam_task_attr) {
1688 case MSG_HEAD_TAG:
1689 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1690 "se_ordered_id: %u\n",
1691 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1692 return false;
5f41a31d
CH		 1693 case MSG_ORDERED_TAG:
1694 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1695 smp_mb__after_atomic_inc();
1696
5f41a31d
CH		 1697 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1698 " se_ordered_id: %u\n",
1699 cmd->t_task_cdb[0], cmd->se_ordered_id);
1700
c66ac9db 1701 /*
5f41a31d
CH		 1702 * Execute an ORDERED command if no other older commands
1703 * exist that need to be completed first.
c66ac9db 1704 */
5f41a31d 1705 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1706 return false;
5f41a31d
CH		 1707 break;
1708 default:
c66ac9db
NB		 1709 /*
1710 * For SIMPLE and UNTAGGED Task Attribute commands
1711 */
5f41a31d 1712 atomic_inc(&dev->simple_cmds);
c66ac9db 1713 smp_mb__after_atomic_inc();
5f41a31d 1714 break;
c66ac9db 1715 }
5f41a31d 1716
019c4ca6
CH		 1717 if (atomic_read(&dev->dev_ordered_sync) == 0)
1718 return false;
c66ac9db 1719
019c4ca6
CH		 1720 spin_lock(&dev->delayed_cmd_lock);
1721 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1722 spin_unlock(&dev->delayed_cmd_lock);
1723
1724 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1725 " delayed CMD list, se_ordered_id: %u\n",
1726 cmd->t_task_cdb[0], cmd->sam_task_attr,
1727 cmd->se_ordered_id);
1728 return true;
1729}
1730
1731void target_execute_cmd(struct se_cmd *cmd)
1732{
1733 /*
1734 * If the received CDB has aleady been aborted stop processing it here.
1735 */
4a9a6c8d 1736 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1737 return;
c66ac9db 1738
019c4ca6
CH		 1739 /*
1740 * Determine if frontend context caller is requesting the stopping of
1741 * this command for frontend exceptions.
1742 */
4a9a6c8d 1743 spin_lock_irq(&cmd->t_state_lock);
019c4ca6
CH		 1744 if (cmd->transport_state & CMD_T_STOP) {
1745 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1746 __func__, __LINE__,
1747 cmd->se_tfo->get_task_tag(cmd));
1748
1749 spin_unlock_irq(&cmd->t_state_lock);
1750 complete(&cmd->t_transport_stop_comp);
1751 return;
1752 }
1753
1754 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1755 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6
CH		 1756 spin_unlock_irq(&cmd->t_state_lock);
1757
1a398b97
NB		 1758 if (target_handle_task_attr(cmd)) {
1759 spin_lock_irq(&cmd->t_state_lock);
1760 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1761 spin_unlock_irq(&cmd->t_state_lock);
1762 return;
1763 }
1764
1765 __target_execute_cmd(cmd);
c66ac9db 1766}
70baf0ab 1767EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1768
5f41a31d
CH		 1769/*
1770 * Process all commands up to the last received ORDERED task attribute which
1771 * requires another blocking boundary
1772 */
1773static void target_restart_delayed_cmds(struct se_device *dev)
1774{
1775 for (;;) {
1776 struct se_cmd *cmd;
1777
1778 spin_lock(&dev->delayed_cmd_lock);
1779 if (list_empty(&dev->delayed_cmd_list)) {
1780 spin_unlock(&dev->delayed_cmd_lock);
1781 break;
1782 }
1783
1784 cmd = list_entry(dev->delayed_cmd_list.next,
1785 struct se_cmd, se_delayed_node);
1786 list_del(&cmd->se_delayed_node);
1787 spin_unlock(&dev->delayed_cmd_lock);
1788
1789 __target_execute_cmd(cmd);
1790
1791 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1792 break;
1793 }
1794}
1795
c66ac9db 1796/*
35e0e757 1797 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1798 * and ordered cmds need to have their tasks added to the execution queue.
1799 */
1800static void transport_complete_task_attr(struct se_cmd *cmd)
1801{
5951146d 1802 struct se_device *dev = cmd->se_dev;
c66ac9db 1803
019c4ca6
CH		 1804 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1805 return;
1806
e66ecd50 1807 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1808 atomic_dec(&dev->simple_cmds);
1809 smp_mb__after_atomic_dec();
1810 dev->dev_cur_ordered_id++;
6708bb27 1811 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1812 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1813 cmd->se_ordered_id);
e66ecd50 1814 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1815 dev->dev_cur_ordered_id++;
6708bb27 1816 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1817 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1818 cmd->se_ordered_id);
e66ecd50 1819 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1820 atomic_dec(&dev->dev_ordered_sync);
1821 smp_mb__after_atomic_dec();
c66ac9db
NB		 1822
1823 dev->dev_cur_ordered_id++;
6708bb27 1824 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1825 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1826 }
c66ac9db 1827
5f41a31d 1828 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1829}
1830
e057f533 1831static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1832{
1833 int ret = 0;
1834
019c4ca6 1835 transport_complete_task_attr(cmd);
e057f533
CH		 1836
1837 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1838 trace_target_cmd_complete(cmd);
e057f533
CH		 1839 ret = cmd->se_tfo->queue_status(cmd);
1840 if (ret)
1841 goto out;
1842 }
07bde79a
NB		 1843
1844 switch (cmd->data_direction) {
1845 case DMA_FROM_DEVICE:
e5c0d6ad 1846 trace_target_cmd_complete(cmd);
07bde79a
NB		 1847 ret = cmd->se_tfo->queue_data_in(cmd);
1848 break;
1849 case DMA_TO_DEVICE:
64577407 1850 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a
NB		 1851 ret = cmd->se_tfo->queue_data_in(cmd);
1852 if (ret < 0)
e057f533 1853 break;
07bde79a
NB		 1854 }
1855 /* Fall through for DMA_TO_DEVICE */
1856 case DMA_NONE:
e5c0d6ad 1857 trace_target_cmd_complete(cmd);
07bde79a
NB		 1858 ret = cmd->se_tfo->queue_status(cmd);
1859 break;
1860 default:
1861 break;
1862 }
1863
e057f533
CH		 1864out:
1865 if (ret < 0) {
1866 transport_handle_queue_full(cmd, cmd->se_dev);
1867 return;
1868 }
1869 transport_lun_remove_cmd(cmd);
1870 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1871}
1872
1873static void transport_handle_queue_full(
1874 struct se_cmd *cmd,
e057f533 1875 struct se_device *dev)
07bde79a
NB		 1876{
1877 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1878 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1879 atomic_inc(&dev->dev_qf_count);
1880 smp_mb__after_atomic_inc();
1881 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1882
1883 schedule_work(&cmd->se_dev->qf_work_queue);
1884}
1885
35e0e757 1886static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1887{
35e0e757 1888 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1889 int ret;
35e0e757 1890
c66ac9db
NB		 1891 /*
1892 * Check if we need to move delayed/dormant tasks from cmds on the
1893 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1894 * Attribute.
1895 */
019c4ca6
CH		 1896 transport_complete_task_attr(cmd);
1897
07bde79a
NB		 1898 /*
1899 * Check to schedule QUEUE_FULL work, or execute an existing
1900 * cmd->transport_qf_callback()
1901 */
1902 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1903 schedule_work(&cmd->se_dev->qf_work_queue);
1904
c66ac9db 1905 /*
d5829eac 1906 * Check if we need to send a sense buffer from
c66ac9db
NB		 1907 * the struct se_cmd in question.
1908 */
1909 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1910 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1911 ret = transport_send_check_condition_and_sense(
1912 cmd, 0, 1);
1913 if (ret == -EAGAIN || ret == -ENOMEM)
1914 goto queue_full;
1915
1916 transport_lun_remove_cmd(cmd);
1917 transport_cmd_check_stop_to_fabric(cmd);
1918 return;
c66ac9db
NB		 1919 }
1920 /*
25985edc 1921 * Check for a callback, used by amongst other things
a6b0133c 1922 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 1923 */
a6b0133c
NB		 1924 if (cmd->transport_complete_callback) {
1925 sense_reason_t rc;
1926
1927 rc = cmd->transport_complete_callback(cmd);
a2890087 1928 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
a6b0133c 1929 return;
a2890087
NB		 1930 } else if (rc) {
1931 ret = transport_send_check_condition_and_sense(cmd,
1932 rc, 0);
1933 if (ret == -EAGAIN || ret == -ENOMEM)
1934 goto queue_full;
a6b0133c 1935
a2890087
NB		 1936 transport_lun_remove_cmd(cmd);
1937 transport_cmd_check_stop_to_fabric(cmd);
1938 return;
1939 }
a6b0133c 1940 }
c66ac9db
NB		 1941
1942 switch (cmd->data_direction) {
1943 case DMA_FROM_DEVICE:
1944 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1945 if (cmd->se_lun->lun_sep) {
1946 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1947 cmd->data_length;
1948 }
1949 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1950
e5c0d6ad 1951 trace_target_cmd_complete(cmd);
07bde79a 1952 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1953 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1954 goto queue_full;
c66ac9db
NB		 1955 break;
1956 case DMA_TO_DEVICE:
1957 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1958 if (cmd->se_lun->lun_sep) {
1959 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1960 cmd->data_length;
1961 }
1962 spin_unlock(&cmd->se_lun->lun_sep_lock);
1963 /*
1964 * Check if we need to send READ payload for BIDI-COMMAND
1965 */
64577407 1966 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 1967 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1968 if (cmd->se_lun->lun_sep) {
1969 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1970 cmd->data_length;
1971 }
1972 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1973 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1974 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1975 goto queue_full;
c66ac9db
NB		 1976 break;
1977 }
1978 /* Fall through for DMA_TO_DEVICE */
1979 case DMA_NONE:
e5c0d6ad 1980 trace_target_cmd_complete(cmd);
07bde79a 1981 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1982 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1983 goto queue_full;
c66ac9db
NB		 1984 break;
1985 default:
1986 break;
1987 }
1988
1989 transport_lun_remove_cmd(cmd);
1990 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1991 return;
1992
1993queue_full:
6708bb27 1994 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1995 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1996 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1997 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1998}
1999
6708bb27 2000static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2001{
ec98f782 2002 struct scatterlist *sg;
ec98f782 2003 int count;
c66ac9db 2004
6708bb27
AG		 2005 for_each_sg(sgl, sg, nents, count)
2006 __free_page(sg_page(sg));
c66ac9db 2007
6708bb27
AG		 2008 kfree(sgl);
2009}
c66ac9db 2010
47e459e6
NB		 2011static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2012{
2013 /*
2014 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2015 * emulation, and free + reset pointers if necessary..
2016 */
2017 if (!cmd->t_data_sg_orig)
2018 return;
2019
2020 kfree(cmd->t_data_sg);
2021 cmd->t_data_sg = cmd->t_data_sg_orig;
2022 cmd->t_data_sg_orig = NULL;
2023 cmd->t_data_nents = cmd->t_data_nents_orig;
2024 cmd->t_data_nents_orig = 0;
2025}
2026
6708bb27
AG		 2027static inline void transport_free_pages(struct se_cmd *cmd)
2028{
47e459e6
NB		 2029 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2030 transport_reset_sgl_orig(cmd);
6708bb27 2031 return;
47e459e6
NB		 2032 }
2033 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2034
2035 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2036 cmd->t_data_sg = NULL;
2037 cmd->t_data_nents = 0;
c66ac9db 2038
6708bb27 2039 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2040 cmd->t_bidi_data_sg = NULL;
2041 cmd->t_bidi_data_nents = 0;
acb2bde3
SG		 2042
2043 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2044 cmd->t_prot_sg = NULL;
2045 cmd->t_prot_nents = 0;
c66ac9db
NB		 2046}
2047
e26d99ae
CH		 2048/**
2049 * transport_release_cmd - free a command
2050 * @cmd: command to free
2051 *
2052 * This routine unconditionally frees a command, and reference counting
2053 * or list removal must be done in the caller.
2054 */
d5ddad41 2055static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2056{
2057 BUG_ON(!cmd->se_tfo);
2058
c8e31f26 2059 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2060 core_tmr_release_req(cmd->se_tmr_req);
2061 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2062 kfree(cmd->t_task_cdb);
2063 /*
7481deb4
NB		 2064 * If this cmd has been setup with target_get_sess_cmd(), drop
2065 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2066 */
ca24976a 2067 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2068}
2069
d3df7825
CH		 2070/**
2071 * transport_put_cmd - release a reference to a command
2072 * @cmd: command to release
2073 *
2074 * This routine releases our reference to the command and frees it if possible.
2075 */
d5ddad41 2076static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2077{
c66ac9db 2078 transport_free_pages(cmd);
d5ddad41 2079 return transport_release_cmd(cmd);
c66ac9db 2080}
c66ac9db 2081
4949314c 2082void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2083{
ec98f782 2084 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2085 struct page **pages;
2086 int i;
05d1c7c0
AG		 2087
2088 /*
ec98f782
AG		 2089 * We need to take into account a possible offset here for fabrics like
2090 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2091 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2092 */
4949314c
AG		 2093 if (!cmd->t_data_nents)
2094 return NULL;
3717ef0c
PB		 2095
2096 BUG_ON(!sg);
2097 if (cmd->t_data_nents == 1)
4949314c
AG		 2098 return kmap(sg_page(sg)) + sg->offset;
2099
2100 /* >1 page. use vmap */
2101 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2102 if (!pages)
4949314c
AG		 2103 return NULL;
2104
2105 /* convert sg[] to pages[] */
2106 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2107 pages[i] = sg_page(sg);
2108 }
2109
2110 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2111 kfree(pages);
de103c93 2112 if (!cmd->t_data_vmap)
4949314c
AG		 2113 return NULL;
2114
2115 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2116}
4949314c 2117EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2118
4949314c 2119void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2120{
a1edf9cf 2121 if (!cmd->t_data_nents) {
4949314c 2122 return;
a1edf9cf 2123 } else if (cmd->t_data_nents == 1) {
4949314c 2124 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2125 return;
2126 }
4949314c
AG		 2127
2128 vunmap(cmd->t_data_vmap);
2129 cmd->t_data_vmap = NULL;
05d1c7c0 2130}
4949314c 2131EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2132
c5ff8d6b 2133int
20093994
NB		 2134target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2135 bool zero_page)
c66ac9db 2136{
20093994 2137 struct scatterlist *sg;
ec98f782 2138 struct page *page;
20093994
NB		 2139 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2140 unsigned int nent;
ec98f782 2141 int i = 0;
c66ac9db 2142
20093994
NB		 2143 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2144 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2145 if (!sg)
ec98f782 2146 return -ENOMEM;
c66ac9db 2147
20093994 2148 sg_init_table(sg, nent);
9db9da33 2149
ec98f782
AG		 2150 while (length) {
2151 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2152 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2153 if (!page)
2154 goto out;
c66ac9db 2155
20093994 2156 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2157 length -= page_len;
2158 i++;
c66ac9db 2159 }
20093994
NB		 2160 *sgl = sg;
2161 *nents = nent;
c66ac9db 2162 return 0;
c66ac9db 2163
ec98f782 2164out:
d0e27c88 2165 while (i > 0) {
ec98f782 2166 i--;
20093994 2167 __free_page(sg_page(&sg[i]));
c66ac9db 2168 }
20093994 2169 kfree(sg);
ec98f782 2170 return -ENOMEM;
c66ac9db
NB		 2171}
2172
da0f7619 2173/*
b16a35b0
AG		 2174 * Allocate any required resources to execute the command. For writes we
2175 * might not have the payload yet, so notify the fabric via a call to
2176 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2177 */
de103c93
CH		 2178sense_reason_t
2179transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2180{
c66ac9db
NB		 2181 int ret = 0;
2182
2183 /*
2184 * Determine is the TCM fabric module has already allocated physical
2185 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2186 * beforehand.
c66ac9db 2187 */
ec98f782
AG		 2188 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2189 cmd->data_length) {
20093994
NB		 2190 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2191
8cefe07b
NB		 2192 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2193 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2194 u32 bidi_length;
2195
2196 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2197 bidi_length = cmd->t_task_nolb *
2198 cmd->se_dev->dev_attrib.block_size;
2199 else
2200 bidi_length = cmd->data_length;
2201
2202 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2203 &cmd->t_bidi_data_nents,
2204 bidi_length, zero_flag);
2205 if (ret < 0)
2206 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2207 }
2208
19f9361a 2209 if (cmd->prot_op != TARGET_PROT_NORMAL) {
acb2bde3
SG		 2210 ret = target_alloc_sgl(&cmd->t_prot_sg,
2211 &cmd->t_prot_nents,
2212 cmd->prot_length, true);
2213 if (ret < 0)
2214 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2215 }
2216
20093994
NB		 2217 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2218 cmd->data_length, zero_flag);
c66ac9db 2219 if (ret < 0)
de103c93 2220 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2221 }
c66ac9db 2222 /*
c3196f0c
CH		 2223 * If this command is not a write we can execute it right here,
2224 * for write buffers we need to notify the fabric driver first
2225 * and let it call back once the write buffers are ready.
c66ac9db 2226 */
5f41a31d 2227 target_add_to_state_list(cmd);
c3196f0c
CH		 2228 if (cmd->data_direction != DMA_TO_DEVICE) {
2229 target_execute_cmd(cmd);
2230 return 0;
2231 }
862e6389 2232 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2233
2234 ret = cmd->se_tfo->write_pending(cmd);
2235 if (ret == -EAGAIN || ret == -ENOMEM)
2236 goto queue_full;
2237
de103c93
CH		 2238 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2239 WARN_ON(ret);
2240
b69c1fcf 2241 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2242
c3196f0c
CH		 2243queue_full:
2244 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2245 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2246 transport_handle_queue_full(cmd, cmd->se_dev);
2247 return 0;
c66ac9db 2248}
a1d8b49a 2249EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2250
e057f533 2251static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2252{
f147abb4
NB		 2253 int ret;
2254
2255 ret = cmd->se_tfo->write_pending(cmd);
2256 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2257 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2258 cmd);
2259 transport_handle_queue_full(cmd, cmd->se_dev);
2260 }
07bde79a
NB		 2261}
2262
d5ddad41 2263int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2264{
c130480b 2265 unsigned long flags;
d5ddad41
NB		 2266 int ret = 0;
2267
d14921d6 2268 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2269 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2270 transport_wait_for_tasks(cmd);
2271
d5ddad41 2272 ret = transport_release_cmd(cmd);
d14921d6
NB		 2273 } else {
2274 if (wait_for_tasks)
2275 transport_wait_for_tasks(cmd);
c130480b
NB		 2276 /*
2277 * Handle WRITE failure case where transport_generic_new_cmd()
2278 * has already added se_cmd to state_list, but fabric has
2279 * failed command before I/O submission.
2280 */
2281 if (cmd->state_active) {
2282 spin_lock_irqsave(&cmd->t_state_lock, flags);
2283 target_remove_from_state_list(cmd);
2284 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2285 }
d14921d6 2286
82f1c8a4 2287 if (cmd->se_lun)
c66ac9db 2288 transport_lun_remove_cmd(cmd);
c66ac9db 2289
d5ddad41 2290 ret = transport_put_cmd(cmd);
c66ac9db 2291 }
d5ddad41 2292 return ret;
c66ac9db
NB		 2293}
2294EXPORT_SYMBOL(transport_generic_free_cmd);
2295
a17f091d
NB		 2296/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2297 * @se_sess: session to reference
2298 * @se_cmd: command descriptor to add
a6360785 2299 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2300 */
20361e69 2301int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2302 bool ack_kref)
a17f091d
NB		 2303{
2304 unsigned long flags;
bc187ea6 2305 int ret = 0;
a17f091d 2306
7481deb4 2307 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2308 /*
2309 * Add a second kref if the fabric caller is expecting to handle
2310 * fabric acknowledgement that requires two target_put_sess_cmd()
2311 * invocations before se_cmd descriptor release.
2312 */
86715569 2313 if (ack_kref == true) {
a6360785 2314 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2315 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2316 }
7481deb4 2317
a17f091d 2318 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2319 if (se_sess->sess_tearing_down) {
2320 ret = -ESHUTDOWN;
2321 goto out;
2322 }
a17f091d 2323 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2324out:
a17f091d 2325 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2326 return ret;
a17f091d 2327}
20361e69 2328EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2329
7481deb4 2330static void target_release_cmd_kref(struct kref *kref)
a17f091d 2331{
7481deb4
NB		 2332 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2333 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2334
a17f091d 2335 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2336 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2337 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2338 return;
a17f091d 2339 }
a17f091d 2340 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2341 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2342 complete(&se_cmd->cmd_wait_comp);
7481deb4 2343 return;
a17f091d
NB		 2344 }
2345 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2346 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2347
7481deb4
NB		 2348 se_cmd->se_tfo->release_cmd(se_cmd);
2349}
2350
2351/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2352 * @se_sess: session to reference
2353 * @se_cmd: command descriptor to drop
2354 */
2355int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2356{
ccf5ae83
JE		 2357 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2358 &se_sess->sess_cmd_lock);
a17f091d
NB		 2359}
2360EXPORT_SYMBOL(target_put_sess_cmd);
2361
1c7b13fe
RD		 2362/* target_sess_cmd_list_set_waiting - Flag all commands in
2363 * sess_cmd_list to complete cmd_wait_comp. Set
2364 * sess_tearing_down so no more commands are queued.
2365 * @se_sess: session to flag
a17f091d 2366 */
1c7b13fe 2367void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2368{
2369 struct se_cmd *se_cmd;
2370 unsigned long flags;
2371
a17f091d 2372 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2373 if (se_sess->sess_tearing_down) {
2374 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2375 return;
2376 }
1c7b13fe 2377 se_sess->sess_tearing_down = 1;
9b31a328 2378 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2379
9b31a328 2380 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2381 se_cmd->cmd_wait_set = 1;
2382
2383 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2384}
1c7b13fe 2385EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2386
2387/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2388 * @se_sess: session to wait for active I/O
a17f091d 2389 */
be646c2d 2390void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2391{
2392 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2393 unsigned long flags;
a17f091d
NB		 2394
2395 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2396 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2397 list_del(&se_cmd->se_cmd_list);
2398
2399 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2400 " %d\n", se_cmd, se_cmd->t_state,
2401 se_cmd->se_tfo->get_cmd_state(se_cmd));
2402
be646c2d
JE		 2403 wait_for_completion(&se_cmd->cmd_wait_comp);
2404 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2405 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2406 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2407
2408 se_cmd->se_tfo->release_cmd(se_cmd);
2409 }
9b31a328
NB		 2410
2411 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2412 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2413 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2414
a17f091d
NB		 2415}
2416EXPORT_SYMBOL(target_wait_for_sess_cmds);
2417
5277797d 2418static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2419{
8359cf43 2420 struct se_lun *lun = p;
c66ac9db 2421
5277797d
NB		 2422 percpu_ref_kill(&lun->lun_ref);
2423
2424 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2425 complete(&lun->lun_shutdown_comp);
2426
2427 return 0;
2428}
2429
5277797d 2430int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2431{
2432 struct task_struct *kt;
2433
5277797d 2434 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2435 "tcm_cl_%u", lun->unpacked_lun);
2436 if (IS_ERR(kt)) {
6708bb27 2437 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2438 return PTR_ERR(kt);
c66ac9db
NB		 2439 }
2440 wait_for_completion(&lun->lun_shutdown_comp);
2441
2442 return 0;
2443}
2444
d14921d6
NB		 2445/**
2446 * transport_wait_for_tasks - wait for completion to occur
2447 * @cmd: command to wait
c66ac9db 2448 *
d14921d6
NB		 2449 * Called from frontend fabric context to wait for storage engine
2450 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2451 */
a17f091d 2452bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2453{
2454 unsigned long flags;
2455
a1d8b49a 2456 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2457 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2458 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2459 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2460 return false;
d14921d6 2461 }
cb4f4d3c 2462
c8e31f26
AG		 2463 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2464 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2465 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2466 return false;
d14921d6 2467 }
7d680f3b 2468
3d28934a 2469 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2470 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2471 return false;
d14921d6 2472 }
c66ac9db 2473
7d680f3b 2474 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2475
6708bb27 2476 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2477 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2478 cmd, cmd->se_tfo->get_task_tag(cmd),
2479 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2480
a1d8b49a 2481 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2482
a1d8b49a 2483 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2484
a1d8b49a 2485 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2486 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2487
35d1efe8 2488 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2489 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2490 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2491
d14921d6 2492 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2493
2494 return true;
c66ac9db 2495}
d14921d6 2496EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2497
2498static int transport_get_sense_codes(
2499 struct se_cmd *cmd,
2500 u8 *asc,
2501 u8 *ascq)
2502{
2503 *asc = cmd->scsi_asc;
2504 *ascq = cmd->scsi_ascq;
2505
2506 return 0;
2507}
2508
76736db3
SG		 2509static
2510void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2511{
2512 /* Place failed LBA in sense data information descriptor 0. */
2513 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2514 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2515 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2516 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2517
2518 /* Descriptor Information: failing sector */
2519 put_unaligned_be64(bad_sector, &buffer[12]);
2520}
2521
de103c93
CH		 2522int
2523transport_send_check_condition_and_sense(struct se_cmd *cmd,
2524 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2525{
2526 unsigned char *buffer = cmd->sense_buffer;
2527 unsigned long flags;
c66ac9db
NB		 2528 u8 asc = 0, ascq = 0;
2529
a1d8b49a 2530 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2531 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2532 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2533 return 0;
2534 }
2535 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2536 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2537
2538 if (!reason && from_transport)
2539 goto after_reason;
2540
2541 if (!from_transport)
2542 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2543
c66ac9db
NB		 2544 /*
2545 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2546 * SENSE KEY values from include/scsi/scsi.h
2547 */
2548 switch (reason) {
ba829137
HR		 2549 case TCM_NO_SENSE:
2550 /* CURRENT ERROR */
2551 buffer[0] = 0x70;
2552 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2553 /* Not Ready */
2554 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2555 /* NO ADDITIONAL SENSE INFORMATION */
2556 buffer[SPC_ASC_KEY_OFFSET] = 0;
2557 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2558 break;
c66ac9db 2559 case TCM_NON_EXISTENT_LUN:
eb39d340 2560 /* CURRENT ERROR */
9c58b7dd
RD		 2561 buffer[0] = 0x70;
2562 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2563 /* ILLEGAL REQUEST */
9c58b7dd 2564 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2565 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2566 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2567 break;
c66ac9db
NB		 2568 case TCM_UNSUPPORTED_SCSI_OPCODE:
2569 case TCM_SECTOR_COUNT_TOO_MANY:
2570 /* CURRENT ERROR */
9c58b7dd
RD		 2571 buffer[0] = 0x70;
2572 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2573 /* ILLEGAL REQUEST */
9c58b7dd 2574 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2575 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2576 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2577 break;
2578 case TCM_UNKNOWN_MODE_PAGE:
2579 /* CURRENT ERROR */
9c58b7dd
RD		 2580 buffer[0] = 0x70;
2581 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2582 /* ILLEGAL REQUEST */
9c58b7dd 2583 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2584 /* INVALID FIELD IN CDB */
9c58b7dd 2585 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2586 break;
2587 case TCM_CHECK_CONDITION_ABORT_CMD:
2588 /* CURRENT ERROR */
9c58b7dd
RD		 2589 buffer[0] = 0x70;
2590 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2591 /* ABORTED COMMAND */
9c58b7dd 2592 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2593 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2594 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2595 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2596 break;
2597 case TCM_INCORRECT_AMOUNT_OF_DATA:
2598 /* CURRENT ERROR */
9c58b7dd
RD		 2599 buffer[0] = 0x70;
2600 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2601 /* ABORTED COMMAND */
9c58b7dd 2602 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2603 /* WRITE ERROR */
9c58b7dd 2604 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2605 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2606 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2607 break;
2608 case TCM_INVALID_CDB_FIELD:
2609 /* CURRENT ERROR */
9c58b7dd
RD		 2610 buffer[0] = 0x70;
2611 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2612 /* ILLEGAL REQUEST */
9c58b7dd 2613 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2614 /* INVALID FIELD IN CDB */
9c58b7dd 2615 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2616 break;
2617 case TCM_INVALID_PARAMETER_LIST:
2618 /* CURRENT ERROR */
9c58b7dd
RD		 2619 buffer[0] = 0x70;
2620 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2621 /* ILLEGAL REQUEST */
9c58b7dd 2622 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2623 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2624 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2625 break;
bb992e72
RD		 2626 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2627 /* CURRENT ERROR */
2628 buffer[0] = 0x70;
2629 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2630 /* ILLEGAL REQUEST */
2631 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2632 /* PARAMETER LIST LENGTH ERROR */
2633 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2634 break;
c66ac9db
NB		 2635 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2636 /* CURRENT ERROR */
9c58b7dd
RD		 2637 buffer[0] = 0x70;
2638 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2639 /* ABORTED COMMAND */
9c58b7dd 2640 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2641 /* WRITE ERROR */
9c58b7dd 2642 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2643 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2644 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2645 break;
2646 case TCM_SERVICE_CRC_ERROR:
2647 /* CURRENT ERROR */
9c58b7dd
RD		 2648 buffer[0] = 0x70;
2649 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2650 /* ABORTED COMMAND */
9c58b7dd 2651 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2652 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2653 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2654 /* N/A */
9c58b7dd 2655 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2656 break;
2657 case TCM_SNACK_REJECTED:
2658 /* CURRENT ERROR */
9c58b7dd
RD		 2659 buffer[0] = 0x70;
2660 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2661 /* ABORTED COMMAND */
9c58b7dd 2662 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2663 /* READ ERROR */
9c58b7dd 2664 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2665 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2666 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2667 break;
2668 case TCM_WRITE_PROTECTED:
2669 /* CURRENT ERROR */
9c58b7dd
RD		 2670 buffer[0] = 0x70;
2671 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2672 /* DATA PROTECT */
9c58b7dd 2673 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2674 /* WRITE PROTECTED */
9c58b7dd 2675 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2676 break;
e2397c70
RD		 2677 case TCM_ADDRESS_OUT_OF_RANGE:
2678 /* CURRENT ERROR */
9c58b7dd
RD		 2679 buffer[0] = 0x70;
2680 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2681 /* ILLEGAL REQUEST */
9c58b7dd 2682 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2683 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2684 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2685 break;
c66ac9db
NB		 2686 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2687 /* CURRENT ERROR */
9c58b7dd
RD		 2688 buffer[0] = 0x70;
2689 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2690 /* UNIT ATTENTION */
9c58b7dd 2691 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2692 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2693 buffer[SPC_ASC_KEY_OFFSET] = asc;
2694 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2695 break;
2696 case TCM_CHECK_CONDITION_NOT_READY:
2697 /* CURRENT ERROR */
9c58b7dd
RD		 2698 buffer[0] = 0x70;
2699 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2700 /* Not Ready */
9c58b7dd 2701 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2702 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2703 buffer[SPC_ASC_KEY_OFFSET] = asc;
2704 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2705 break;
818b571c
NB		 2706 case TCM_MISCOMPARE_VERIFY:
2707 /* CURRENT ERROR */
2708 buffer[0] = 0x70;
2709 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2710 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2711 /* MISCOMPARE DURING VERIFY OPERATION */
2712 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2713 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2714 break;
fcc4f17b
NB		 2715 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2716 /* CURRENT ERROR */
2717 buffer[0] = 0x70;
2718 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2719 /* ILLEGAL REQUEST */
2720 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2721 /* LOGICAL BLOCK GUARD CHECK FAILED */
2722 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2723 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
76736db3 2724 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2725 break;
2726 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2727 /* CURRENT ERROR */
2728 buffer[0] = 0x70;
2729 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2730 /* ILLEGAL REQUEST */
2731 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2732 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2733 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2734 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
76736db3 2735 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2736 break;
2737 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2738 /* CURRENT ERROR */
2739 buffer[0] = 0x70;
2740 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2741 /* ILLEGAL REQUEST */
2742 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2743 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2744 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2745 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
76736db3 2746 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b 2747 break;
c66ac9db
NB		 2748 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2749 default:
2750 /* CURRENT ERROR */
9c58b7dd
RD		 2751 buffer[0] = 0x70;
2752 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2753 /*
2754 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2755 * Solaris initiators. Returning NOT READY instead means the
2756 * operations will be retried a finite number of times and we
2757 * can survive intermittent errors.
2758 */
2759 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2760 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2761 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2762 break;
2763 }
2764 /*
2765 * This code uses linux/include/scsi/scsi.h SAM status codes!
2766 */
2767 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2768 /*
2769 * Automatically padded, this value is encoded in the fabric's
2770 * data_length response PDU containing the SCSI defined sense data.
2771 */
9c58b7dd 2772 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2773
2774after_reason:
e5c0d6ad 2775 trace_target_cmd_complete(cmd);
07bde79a 2776 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2777}
2778EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2779
2780int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2781{
c18bc7d8
RD		 2782 if (!(cmd->transport_state & CMD_T_ABORTED))
2783 return 0;
c66ac9db 2784
c18bc7d8
RD		 2785 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2786 return 1;
8b1e1244 2787
c18bc7d8
RD		 2788 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2789 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2790
c18bc7d8 2791 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
29f4c090 2792 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2793 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2794 cmd->se_tfo->queue_status(cmd);
2795
2796 return 1;
c66ac9db
NB		 2797}
2798EXPORT_SYMBOL(transport_check_aborted_status);
2799
2800void transport_send_task_abort(struct se_cmd *cmd)
2801{
c252f003
NB		 2802 unsigned long flags;
2803
2804 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2805 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2806 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2807 return;
2808 }
2809 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2810
c66ac9db
NB		 2811 /*
2812 * If there are still expected incoming fabric WRITEs, we wait
2813 * until until they have completed before sending a TASK_ABORTED
2814 * response. This response with TASK_ABORTED status will be
2815 * queued back to fabric module by transport_check_aborted_status().
2816 */
2817 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2818 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2819 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2820 smp_mb__after_atomic_inc();
29f4c090 2821 return;
c66ac9db
NB		 2822 }
2823 }
2824 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2825
72b59d6e
RD		 2826 transport_lun_remove_cmd(cmd);
2827
6708bb27 2828 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2829 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2830 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2831
e5c0d6ad 2832 trace_target_cmd_complete(cmd);
e3d6f909 2833 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2834}
2835
af877292 2836static void target_tmr_work(struct work_struct *work)
c66ac9db 2837{
af877292 2838 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2839 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2840 struct se_tmr_req *tmr = cmd->se_tmr_req;
2841 int ret;
2842
2843 switch (tmr->function) {
5c6cd613 2844 case TMR_ABORT_TASK:
3d28934a 2845 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2846 break;
5c6cd613
NB		 2847 case TMR_ABORT_TASK_SET:
2848 case TMR_CLEAR_ACA:
2849 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2850 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2851 break;
5c6cd613 2852 case TMR_LUN_RESET:
c66ac9db
NB		 2853 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2854 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2855 TMR_FUNCTION_REJECTED;
2856 break;
5c6cd613 2857 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2858 tmr->response = TMR_FUNCTION_REJECTED;
2859 break;
5c6cd613 2860 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2861 tmr->response = TMR_FUNCTION_REJECTED;
2862 break;
c66ac9db 2863 default:
6708bb27 2864 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2865 tmr->function);
2866 tmr->response = TMR_FUNCTION_REJECTED;
2867 break;
2868 }
2869
2870 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2871 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2872
b7b8bef7 2873 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2874}
2875
af877292
CH		 2876int transport_generic_handle_tmr(
2877 struct se_cmd *cmd)
c66ac9db 2878{
af877292
CH		 2879 INIT_WORK(&cmd->work, target_tmr_work);
2880 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2881 return 0;
2882}
af877292 2883EXPORT_SYMBOL(transport_generic_handle_tmr);
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