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target: Report bad sector in sense data for DIF errors
[GitHub/exynos8895/android_kernel_samsung_universal8895.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
5277797d 597 if (!lun || !cmd->lun_ref_active)
c66ac9db
NB		 598 return;
599
5277797d 600 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 601}
602
603void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
604{
c66ac9db
NB		 605 if (transport_cmd_check_stop_to_fabric(cmd))
606 return;
af877292 607 if (remove)
e6a2573f 608 transport_put_cmd(cmd);
c66ac9db
NB		 609}
610
35e0e757
CH		 611static void target_complete_failure_work(struct work_struct *work)
612{
613 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
614
de103c93
CH		 615 transport_generic_request_failure(cmd,
616 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 617}
618
6138ed2a 619/*
d5829eac
PB		 620 * Used when asking transport to copy Sense Data from the underlying
621 * Linux/SCSI struct scsi_cmnd
6138ed2a 622 */
d5829eac 623static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 624{
6138ed2a 625 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 626
627 WARN_ON(!cmd->se_lun);
628
629 if (!dev)
d5829eac 630 return NULL;
6138ed2a 631
d5829eac
PB		 632 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
633 return NULL;
6138ed2a 634
9c58b7dd 635 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 636
d5829eac 637 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 638 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 639 return cmd->sense_buffer;
6138ed2a
PB		 640}
641
5787cacd 642void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 643{
42bf829e 644 struct se_device *dev = cmd->se_dev;
5787cacd 645 int success = scsi_status == GOOD;
c66ac9db 646 unsigned long flags;
c66ac9db 647
5787cacd
CH		 648 cmd->scsi_status = scsi_status;
649
650
a1d8b49a 651 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 652 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 653
c66ac9db 654 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 655 dev->transport->transport_complete(cmd,
656 cmd->t_data_sg,
657 transport_get_sense_buffer(cmd));
658 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 659 success = 1;
c66ac9db
NB		 660 }
661
662 /*
5787cacd 663 * See if we are waiting to complete for an exception condition.
c66ac9db 664 */
cf572a96 665 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 666 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 667 complete(&cmd->task_stop_comp);
c66ac9db
NB		 668 return;
669 }
2235007c
CH		 670
671 if (!success)
7d680f3b 672 cmd->transport_state |= CMD_T_FAILED;
2235007c 673
3d28934a 674 /*
125d0119 675 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 676 * and transport_wait_for_tasks() will be waiting for completion..
677 */
678 if (cmd->transport_state & CMD_T_ABORTED &&
679 cmd->transport_state & CMD_T_STOP) {
680 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
681 complete(&cmd->t_transport_stop_comp);
682 return;
683 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 684 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 685 } else {
35e0e757 686 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 687 }
35e0e757 688
35e0e757 689 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 690 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 691 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 692
35e0e757 693 queue_work(target_completion_wq, &cmd->work);
c66ac9db 694}
6bb35e00
CH		 695EXPORT_SYMBOL(target_complete_cmd);
696
cf572a96 697static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 698{
cf572a96
CH		 699 struct se_device *dev = cmd->se_dev;
700 unsigned long flags;
c66ac9db 701
cf572a96
CH		 702 spin_lock_irqsave(&dev->execute_task_lock, flags);
703 if (!cmd->state_active) {
704 list_add_tail(&cmd->state_list, &dev->state_list);
705 cmd->state_active = true;
c66ac9db 706 }
cf572a96 707 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 708}
709
07bde79a 710/*
f147abb4 711 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 712 */
7a6f0a1e
CH		 713static void transport_write_pending_qf(struct se_cmd *cmd);
714static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 715
0fd97ccf 716void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 717{
718 struct se_device *dev = container_of(work, struct se_device,
719 qf_work_queue);
bcac364a 720 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 721 struct se_cmd *cmd, *cmd_tmp;
722
723 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 724 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
725 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 726
bcac364a 727 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 728 list_del(&cmd->se_qf_node);
729 atomic_dec(&dev->dev_qf_count);
730 smp_mb__after_atomic_dec();
07bde79a 731
6708bb27 732 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 733 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 734 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 735 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
736 : "UNKNOWN");
f7a5cc0b 737
7a6f0a1e
CH		 738 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
739 transport_write_pending_qf(cmd);
740 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
741 transport_complete_qf(cmd);
07bde79a 742 }
07bde79a
NB		 743}
744
c66ac9db
NB		 745unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
746{
747 switch (cmd->data_direction) {
748 case DMA_NONE:
749 return "NONE";
750 case DMA_FROM_DEVICE:
751 return "READ";
752 case DMA_TO_DEVICE:
753 return "WRITE";
754 case DMA_BIDIRECTIONAL:
755 return "BIDI";
756 default:
757 break;
758 }
759
760 return "UNKNOWN";
761}
762
763void transport_dump_dev_state(
764 struct se_device *dev,
765 char *b,
766 int *bl)
767{
768 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 769 if (dev->export_count)
c66ac9db 770 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 771 else
c66ac9db 772 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 773
5f41a31d 774 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 775 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 776 dev->dev_attrib.block_size,
777 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 778 *bl += sprintf(b + *bl, " ");
779}
780
c66ac9db
NB		 781void transport_dump_vpd_proto_id(
782 struct t10_vpd *vpd,
783 unsigned char *p_buf,
784 int p_buf_len)
785{
786 unsigned char buf[VPD_TMP_BUF_SIZE];
787 int len;
788
789 memset(buf, 0, VPD_TMP_BUF_SIZE);
790 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
791
792 switch (vpd->protocol_identifier) {
793 case 0x00:
794 sprintf(buf+len, "Fibre Channel\n");
795 break;
796 case 0x10:
797 sprintf(buf+len, "Parallel SCSI\n");
798 break;
799 case 0x20:
800 sprintf(buf+len, "SSA\n");
801 break;
802 case 0x30:
803 sprintf(buf+len, "IEEE 1394\n");
804 break;
805 case 0x40:
806 sprintf(buf+len, "SCSI Remote Direct Memory Access"
807 " Protocol\n");
808 break;
809 case 0x50:
810 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
811 break;
812 case 0x60:
813 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
814 break;
815 case 0x70:
816 sprintf(buf+len, "Automation/Drive Interface Transport"
817 " Protocol\n");
818 break;
819 case 0x80:
820 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
821 break;
822 default:
823 sprintf(buf+len, "Unknown 0x%02x\n",
824 vpd->protocol_identifier);
825 break;
826 }
827
828 if (p_buf)
829 strncpy(p_buf, buf, p_buf_len);
830 else
6708bb27 831 pr_debug("%s", buf);
c66ac9db
NB		 832}
833
834void
835transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
836{
837 /*
838 * Check if the Protocol Identifier Valid (PIV) bit is set..
839 *
840 * from spc3r23.pdf section 7.5.1
841 */
842 if (page_83[1] & 0x80) {
843 vpd->protocol_identifier = (page_83[0] & 0xf0);
844 vpd->protocol_identifier_set = 1;
845 transport_dump_vpd_proto_id(vpd, NULL, 0);
846 }
847}
848EXPORT_SYMBOL(transport_set_vpd_proto_id);
849
850int transport_dump_vpd_assoc(
851 struct t10_vpd *vpd,
852 unsigned char *p_buf,
853 int p_buf_len)
854{
855 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 856 int ret = 0;
857 int len;
c66ac9db
NB		 858
859 memset(buf, 0, VPD_TMP_BUF_SIZE);
860 len = sprintf(buf, "T10 VPD Identifier Association: ");
861
862 switch (vpd->association) {
863 case 0x00:
864 sprintf(buf+len, "addressed logical unit\n");
865 break;
866 case 0x10:
867 sprintf(buf+len, "target port\n");
868 break;
869 case 0x20:
870 sprintf(buf+len, "SCSI target device\n");
871 break;
872 default:
873 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 874 ret = -EINVAL;
c66ac9db
NB		 875 break;
876 }
877
878 if (p_buf)
879 strncpy(p_buf, buf, p_buf_len);
880 else
6708bb27 881 pr_debug("%s", buf);
c66ac9db
NB		 882
883 return ret;
884}
885
886int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
887{
888 /*
889 * The VPD identification association..
890 *
891 * from spc3r23.pdf Section 7.6.3.1 Table 297
892 */
893 vpd->association = (page_83[1] & 0x30);
894 return transport_dump_vpd_assoc(vpd, NULL, 0);
895}
896EXPORT_SYMBOL(transport_set_vpd_assoc);
897
898int transport_dump_vpd_ident_type(
899 struct t10_vpd *vpd,
900 unsigned char *p_buf,
901 int p_buf_len)
902{
903 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 904 int ret = 0;
905 int len;
c66ac9db
NB		 906
907 memset(buf, 0, VPD_TMP_BUF_SIZE);
908 len = sprintf(buf, "T10 VPD Identifier Type: ");
909
910 switch (vpd->device_identifier_type) {
911 case 0x00:
912 sprintf(buf+len, "Vendor specific\n");
913 break;
914 case 0x01:
915 sprintf(buf+len, "T10 Vendor ID based\n");
916 break;
917 case 0x02:
918 sprintf(buf+len, "EUI-64 based\n");
919 break;
920 case 0x03:
921 sprintf(buf+len, "NAA\n");
922 break;
923 case 0x04:
924 sprintf(buf+len, "Relative target port identifier\n");
925 break;
926 case 0x08:
927 sprintf(buf+len, "SCSI name string\n");
928 break;
929 default:
930 sprintf(buf+len, "Unsupported: 0x%02x\n",
931 vpd->device_identifier_type);
e3d6f909 932 ret = -EINVAL;
c66ac9db
NB		 933 break;
934 }
935
e3d6f909
AG		 936 if (p_buf) {
937 if (p_buf_len < strlen(buf)+1)
938 return -EINVAL;
c66ac9db 939 strncpy(p_buf, buf, p_buf_len);
e3d6f909 940 } else {
6708bb27 941 pr_debug("%s", buf);
e3d6f909 942 }
c66ac9db
NB		 943
944 return ret;
945}
946
947int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
948{
949 /*
950 * The VPD identifier type..
951 *
952 * from spc3r23.pdf Section 7.6.3.1 Table 298
953 */
954 vpd->device_identifier_type = (page_83[1] & 0x0f);
955 return transport_dump_vpd_ident_type(vpd, NULL, 0);
956}
957EXPORT_SYMBOL(transport_set_vpd_ident_type);
958
959int transport_dump_vpd_ident(
960 struct t10_vpd *vpd,
961 unsigned char *p_buf,
962 int p_buf_len)
963{
964 unsigned char buf[VPD_TMP_BUF_SIZE];
965 int ret = 0;
966
967 memset(buf, 0, VPD_TMP_BUF_SIZE);
968
969 switch (vpd->device_identifier_code_set) {
970 case 0x01: /* Binary */
703d641d
DC		 971 snprintf(buf, sizeof(buf),
972 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 973 &vpd->device_identifier[0]);
974 break;
975 case 0x02: /* ASCII */
703d641d
DC		 976 snprintf(buf, sizeof(buf),
977 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 978 &vpd->device_identifier[0]);
979 break;
980 case 0x03: /* UTF-8 */
703d641d
DC		 981 snprintf(buf, sizeof(buf),
982 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 983 &vpd->device_identifier[0]);
984 break;
985 default:
986 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
987 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 988 ret = -EINVAL;
c66ac9db
NB		 989 break;
990 }
991
992 if (p_buf)
993 strncpy(p_buf, buf, p_buf_len);
994 else
6708bb27 995 pr_debug("%s", buf);
c66ac9db
NB		 996
997 return ret;
998}
999
1000int
1001transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1002{
1003 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1004 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1005
1006 /*
1007 * The VPD Code Set (encoding)
1008 *
1009 * from spc3r23.pdf Section 7.6.3.1 Table 296
1010 */
1011 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1012 switch (vpd->device_identifier_code_set) {
1013 case 0x01: /* Binary */
1014 vpd->device_identifier[j++] =
1015 hex_str[vpd->device_identifier_type];
1016 while (i < (4 + page_83[3])) {
1017 vpd->device_identifier[j++] =
1018 hex_str[(page_83[i] & 0xf0) >> 4];
1019 vpd->device_identifier[j++] =
1020 hex_str[page_83[i] & 0x0f];
1021 i++;
1022 }
1023 break;
1024 case 0x02: /* ASCII */
1025 case 0x03: /* UTF-8 */
1026 while (i < (4 + page_83[3]))
1027 vpd->device_identifier[j++] = page_83[i++];
1028 break;
1029 default:
1030 break;
1031 }
1032
1033 return transport_dump_vpd_ident(vpd, NULL, 0);
1034}
1035EXPORT_SYMBOL(transport_set_vpd_ident);
1036
de103c93
CH		 1037sense_reason_t
1038target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1039{
1040 struct se_device *dev = cmd->se_dev;
1041
1042 if (cmd->unknown_data_length) {
1043 cmd->data_length = size;
1044 } else if (size != cmd->data_length) {
1045 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1046 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1047 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1048 cmd->data_length, size, cmd->t_task_cdb[0]);
1049
9b3b8041
CH		 1050 if (cmd->data_direction == DMA_TO_DEVICE) {
1051 pr_err("Rejecting underflow/overflow"
1052 " WRITE data\n");
de103c93 1053 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1054 }
1055 /*
1056 * Reject READ_* or WRITE_* with overflow/underflow for
1057 * type SCF_SCSI_DATA_CDB.
1058 */
0fd97ccf 1059 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1060 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1061 " CDB on non 512-byte sector setup subsystem"
1062 " plugin: %s\n", dev->transport->name);
1063 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1064 return TCM_INVALID_CDB_FIELD;
9b3b8041 1065 }
4c054ba6
NB		 1066 /*
1067 * For the overflow case keep the existing fabric provided
1068 * ->data_length. Otherwise for the underflow case, reset
1069 * ->data_length to the smaller SCSI expected data transfer
1070 * length.
1071 */
9b3b8041
CH		 1072 if (size > cmd->data_length) {
1073 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1074 cmd->residual_count = (size - cmd->data_length);
1075 } else {
1076 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1077 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1078 cmd->data_length = size;
9b3b8041 1079 }
9b3b8041
CH		 1080 }
1081
1082 return 0;
1083
9b3b8041
CH		 1084}
1085
c66ac9db
NB		 1086/*
1087 * Used by fabric modules containing a local struct se_cmd within their
1088 * fabric dependent per I/O descriptor.
1089 */
1090void transport_init_se_cmd(
1091 struct se_cmd *cmd,
1092 struct target_core_fabric_ops *tfo,
1093 struct se_session *se_sess,
1094 u32 data_length,
1095 int data_direction,
1096 int task_attr,
1097 unsigned char *sense_buffer)
1098{
5951146d 1099 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1100 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1101 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1102 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1103 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1104 init_completion(&cmd->cmd_wait_comp);
cf572a96 1105 init_completion(&cmd->task_stop_comp);
a1d8b49a 1106 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1107 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1108
1109 cmd->se_tfo = tfo;
1110 cmd->se_sess = se_sess;
1111 cmd->data_length = data_length;
1112 cmd->data_direction = data_direction;
1113 cmd->sam_task_attr = task_attr;
1114 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1115
1116 cmd->state_active = false;
c66ac9db
NB		 1117}
1118EXPORT_SYMBOL(transport_init_se_cmd);
1119
de103c93
CH		 1120static sense_reason_t
1121transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1122{
019c4ca6
CH		 1123 struct se_device *dev = cmd->se_dev;
1124
c66ac9db
NB		 1125 /*
1126 * Check if SAM Task Attribute emulation is enabled for this
1127 * struct se_device storage object
1128 */
019c4ca6 1129 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1130 return 0;
1131
e66ecd50 1132 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1133 pr_debug("SAM Task Attribute ACA"
c66ac9db 1134 " emulation is not supported\n");
de103c93 1135 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1136 }
1137 /*
1138 * Used to determine when ORDERED commands should go from
1139 * Dormant to Active status.
1140 */
019c4ca6 1141 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1142 smp_mb__after_atomic_inc();
6708bb27 1143 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1144 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1145 dev->transport->name);
c66ac9db
NB		 1146 return 0;
1147}
1148
de103c93
CH		 1149sense_reason_t
1150target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1151{
0fd97ccf 1152 struct se_device *dev = cmd->se_dev;
de103c93 1153 sense_reason_t ret;
c66ac9db 1154
c66ac9db
NB		 1155 /*
1156 * Ensure that the received CDB is less than the max (252 + 8) bytes
1157 * for VARIABLE_LENGTH_CMD
1158 */
1159 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1160 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1161 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1162 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1163 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1164 }
1165 /*
1166 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1167 * allocate the additional extended CDB buffer now.. Otherwise
1168 * setup the pointer from __t_task_cdb to t_task_cdb.
1169 */
a1d8b49a
AG		 1170 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1171 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1172 GFP_KERNEL);
6708bb27
AG		 1173 if (!cmd->t_task_cdb) {
1174 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1175 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1176 scsi_command_size(cdb),
a1d8b49a 1177 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1178 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1179 }
1180 } else
a1d8b49a 1181 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1182 /*
a1d8b49a 1183 * Copy the original CDB into cmd->
c66ac9db 1184 */
a1d8b49a 1185 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1186
e5c0d6ad
RD		 1187 trace_target_sequencer_start(cmd);
1188
cb4f4d3c
CH		 1189 /*
1190 * Check for an existing UNIT ATTENTION condition
1191 */
de103c93
CH		 1192 ret = target_scsi3_ua_check(cmd);
1193 if (ret)
1194 return ret;
cb4f4d3c 1195
c87fbd56 1196 ret = target_alua_state_check(cmd);
de103c93
CH		 1197 if (ret)
1198 return ret;
cb4f4d3c 1199
d977f437 1200 ret = target_check_reservation(cmd);
f85eda8d
NB		 1201 if (ret) {
1202 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1203 return ret;
f85eda8d 1204 }
cb4f4d3c 1205
0fd97ccf 1206 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1207 if (ret)
1208 return ret;
1209
1210 ret = transport_check_alloc_task_attr(cmd);
1211 if (ret)
c66ac9db 1212 return ret;
cb4f4d3c 1213
cb4f4d3c 1214 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1215
c66ac9db
NB		 1216 spin_lock(&cmd->se_lun->lun_sep_lock);
1217 if (cmd->se_lun->lun_sep)
1218 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1219 spin_unlock(&cmd->se_lun->lun_sep_lock);
1220 return 0;
1221}
a12f41f8 1222EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1223
695434e1
NB		 1224/*
1225 * Used by fabric module frontends to queue tasks directly.
1226 * Many only be used from process context only
1227 */
1228int transport_handle_cdb_direct(
1229 struct se_cmd *cmd)
1230{
de103c93 1231 sense_reason_t ret;
dd8ae59d 1232
695434e1
NB		 1233 if (!cmd->se_lun) {
1234 dump_stack();
6708bb27 1235 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1236 return -EINVAL;
1237 }
1238 if (in_interrupt()) {
1239 dump_stack();
6708bb27 1240 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1241 " from interrupt context\n");
1242 return -EINVAL;
1243 }
dd8ae59d 1244 /*
af877292
CH		 1245 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1246 * outstanding descriptors are handled correctly during shutdown via
1247 * transport_wait_for_tasks()
dd8ae59d
NB		 1248 *
1249 * Also, we don't take cmd->t_state_lock here as we only expect
1250 * this to be called for initial descriptor submission.
1251 */
1252 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1253 cmd->transport_state |= CMD_T_ACTIVE;
1254
dd8ae59d
NB		 1255 /*
1256 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1257 * so follow TRANSPORT_NEW_CMD processing thread context usage
1258 * and call transport_generic_request_failure() if necessary..
1259 */
1260 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1261 if (ret)
1262 transport_generic_request_failure(cmd, ret);
dd8ae59d 1263 return 0;
695434e1
NB		 1264}
1265EXPORT_SYMBOL(transport_handle_cdb_direct);
1266
c5ff8d6b 1267sense_reason_t
de103c93
CH		 1268transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1269 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1270{
1271 if (!sgl || !sgl_count)
1272 return 0;
1273
1274 /*
1275 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1276 * scatterlists already have been set to follow what the fabric
1277 * passes for the original expected data transfer length.
1278 */
1279 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1280 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1281 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1282 return TCM_INVALID_CDB_FIELD;
1283 }
1284
1285 cmd->t_data_sg = sgl;
1286 cmd->t_data_nents = sgl_count;
1287
1288 if (sgl_bidi && sgl_bidi_count) {
1289 cmd->t_bidi_data_sg = sgl_bidi;
1290 cmd->t_bidi_data_nents = sgl_bidi_count;
1291 }
1292 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1293 return 0;
1294}
1295
a026757f
NB		 1296/*
1297 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1298 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1299 *
1300 * @se_cmd: command descriptor to submit
1301 * @se_sess: associated se_sess for endpoint
1302 * @cdb: pointer to SCSI CDB
1303 * @sense: pointer to SCSI sense buffer
1304 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1305 * @data_length: fabric expected data transfer length
1306 * @task_addr: SAM task attribute
1307 * @data_dir: DMA data direction
1308 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1309 * @sgl: struct scatterlist memory for unidirectional mapping
1310 * @sgl_count: scatterlist count for unidirectional mapping
1311 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1312 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1313 * @sgl_prot: struct scatterlist memory protection information
1314 * @sgl_prot_count: scatterlist count for protection information
a6360785 1315 *
d6dfc868
RD		 1316 * Returns non zero to signal active I/O shutdown failure. All other
1317 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1318 * but still return zero here.
1319 *
a6360785
NB		 1320 * This may only be called from process context, and also currently
1321 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1322 */
1323int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1324 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1325 u32 data_length, int task_attr, int data_dir, int flags,
1326 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1327 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1328 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1329{
1330 struct se_portal_group *se_tpg;
de103c93
CH		 1331 sense_reason_t rc;
1332 int ret;
a6360785
NB		 1333
1334 se_tpg = se_sess->se_tpg;
1335 BUG_ON(!se_tpg);
1336 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1337 BUG_ON(in_interrupt());
1338 /*
1339 * Initialize se_cmd for target operation. From this point
1340 * exceptions are handled by sending exception status via
1341 * target_core_fabric_ops->queue_status() callback
1342 */
1343 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1344 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1345 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1346 se_cmd->unknown_data_length = 1;
a6360785
NB		 1347 /*
1348 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1349 * se_sess->sess_cmd_list. A second kref_get here is necessary
1350 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1351 * kref_put() to happen during fabric packet acknowledgement.
1352 */
de103c93
CH		 1353 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1354 if (ret)
1355 return ret;
a6360785
NB		 1356 /*
1357 * Signal bidirectional data payloads to target-core
1358 */
1359 if (flags & TARGET_SCF_BIDI_OP)
1360 se_cmd->se_cmd_flags |= SCF_BIDI;
1361 /*
1362 * Locate se_lun pointer and attach it to struct se_cmd
1363 */
de103c93
CH		 1364 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1365 if (rc) {
1366 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1367 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1368 return 0;
735703ca 1369 }
def2b339
NB		 1370 /*
1371 * Save pointers for SGLs containing protection information,
1372 * if present.
1373 */
1374 if (sgl_prot_count) {
1375 se_cmd->t_prot_sg = sgl_prot;
1376 se_cmd->t_prot_nents = sgl_prot_count;
1377 }
d6e0175c 1378
a12f41f8 1379 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1380 if (rc != 0) {
de103c93 1381 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1382 return 0;
735703ca 1383 }
a026757f
NB		 1384 /*
1385 * When a non zero sgl_count has been passed perform SGL passthrough
1386 * mapping for pre-allocated fabric memory instead of having target
1387 * core perform an internal SGL allocation..
1388 */
1389 if (sgl_count != 0) {
1390 BUG_ON(!sgl);
1391
944981c7
NB		 1392 /*
1393 * A work-around for tcm_loop as some userspace code via
1394 * scsi-generic do not memset their associated read buffers,
1395 * so go ahead and do that here for type non-data CDBs. Also
1396 * note that this is currently guaranteed to be a single SGL
1397 * for this case by target core in target_setup_cmd_from_cdb()
1398 * -> transport_generic_cmd_sequencer().
1399 */
1400 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1401 se_cmd->data_direction == DMA_FROM_DEVICE) {
1402 unsigned char *buf = NULL;
1403
1404 if (sgl)
1405 buf = kmap(sg_page(sgl)) + sgl->offset;
1406
1407 if (buf) {
1408 memset(buf, 0, sgl->length);
1409 kunmap(sg_page(sgl));
1410 }
1411 }
1412
a026757f
NB		 1413 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1414 sgl_bidi, sgl_bidi_count);
1415 if (rc != 0) {
de103c93 1416 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1417 return 0;
1418 }
1419 }
def2b339 1420
11e319ed
AG		 1421 /*
1422 * Check if we need to delay processing because of ALUA
1423 * Active/NonOptimized primary access state..
1424 */
1425 core_alua_check_nonop_delay(se_cmd);
1426
a6360785 1427 transport_handle_cdb_direct(se_cmd);
d6dfc868 1428 return 0;
a6360785 1429}
a026757f
NB		 1430EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1431
1432/*
1433 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1434 *
1435 * @se_cmd: command descriptor to submit
1436 * @se_sess: associated se_sess for endpoint
1437 * @cdb: pointer to SCSI CDB
1438 * @sense: pointer to SCSI sense buffer
1439 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1440 * @data_length: fabric expected data transfer length
1441 * @task_addr: SAM task attribute
1442 * @data_dir: DMA data direction
1443 * @flags: flags for command submission from target_sc_flags_tables
1444 *
1445 * Returns non zero to signal active I/O shutdown failure. All other
1446 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1447 * but still return zero here.
1448 *
1449 * This may only be called from process context, and also currently
1450 * assumes internal allocation of fabric payload buffer by target-core.
1451 *
1452 * It also assumes interal target core SGL memory allocation.
1453 */
1454int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1455 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1456 u32 data_length, int task_attr, int data_dir, int flags)
1457{
1458 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1459 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1460 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1461}
a6360785
NB		 1462EXPORT_SYMBOL(target_submit_cmd);
1463
9f0d05c2
NB		 1464static void target_complete_tmr_failure(struct work_struct *work)
1465{
1466 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1467
1468 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1469 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1470
1471 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1472}
1473
ea98d7f9
AG		 1474/**
1475 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1476 * for TMR CDBs
1477 *
1478 * @se_cmd: command descriptor to submit
1479 * @se_sess: associated se_sess for endpoint
1480 * @sense: pointer to SCSI sense buffer
1481 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1482 * @fabric_context: fabric context for TMR req
1483 * @tm_type: Type of TM request
c0974f89
NB		 1484 * @gfp: gfp type for caller
1485 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1486 * @flags: submit cmd flags
ea98d7f9
AG		 1487 *
1488 * Callable from all contexts.
1489 **/
1490
c7042cae 1491int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1492 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1493 void *fabric_tmr_ptr, unsigned char tm_type,
1494 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1495{
1496 struct se_portal_group *se_tpg;
1497 int ret;
1498
1499 se_tpg = se_sess->se_tpg;
1500 BUG_ON(!se_tpg);
1501
1502 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1503 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1504 /*
1505 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1506 * allocation failure.
1507 */
c0974f89 1508 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1509 if (ret < 0)
1510 return -ENOMEM;
ea98d7f9 1511
c0974f89
NB		 1512 if (tm_type == TMR_ABORT_TASK)
1513 se_cmd->se_tmr_req->ref_task_tag = tag;
1514
ea98d7f9 1515 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1516 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1517 if (ret) {
1518 core_tmr_release_req(se_cmd->se_tmr_req);
1519 return ret;
1520 }
ea98d7f9 1521
ea98d7f9
AG		 1522 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1523 if (ret) {
9f0d05c2
NB		 1524 /*
1525 * For callback during failure handling, push this work off
1526 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1527 */
1528 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1529 schedule_work(&se_cmd->work);
c7042cae 1530 return 0;
ea98d7f9
AG		 1531 }
1532 transport_generic_handle_tmr(se_cmd);
c7042cae 1533 return 0;
ea98d7f9
AG		 1534}
1535EXPORT_SYMBOL(target_submit_tmr);
1536
cdbb70bb 1537/*
cf572a96 1538 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1539 * has completed.
1540 */
cf572a96 1541bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1542{
cdbb70bb
CH		 1543 bool was_active = false;
1544
cf572a96
CH		 1545 if (cmd->transport_state & CMD_T_BUSY) {
1546 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1547 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1548
cf572a96
CH		 1549 pr_debug("cmd %p waiting to complete\n", cmd);
1550 wait_for_completion(&cmd->task_stop_comp);
1551 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1552
1553 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1554 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1555 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1556 was_active = true;
1557 }
1558
cdbb70bb
CH		 1559 return was_active;
1560}
1561
c66ac9db
NB		 1562/*
1563 * Handle SAM-esque emulation for generic transport request failures.
1564 */
de103c93
CH		 1565void transport_generic_request_failure(struct se_cmd *cmd,
1566 sense_reason_t sense_reason)
c66ac9db 1567{
07bde79a
NB		 1568 int ret = 0;
1569
6708bb27 1570 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1571 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1572 cmd->t_task_cdb[0]);
de103c93 1573 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1574 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1575 cmd->t_state, sense_reason);
d43d6aea 1576 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1577 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1578 (cmd->transport_state & CMD_T_STOP) != 0,
1579 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1580
c66ac9db
NB		 1581 /*
1582 * For SAM Task Attribute emulation for failed struct se_cmd
1583 */
019c4ca6 1584 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1585 /*
1586 * Handle special case for COMPARE_AND_WRITE failure, where the
1587 * callback is expected to drop the per device ->caw_mutex.
1588 */
1589 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1590 cmd->transport_complete_callback)
1591 cmd->transport_complete_callback(cmd);
c66ac9db 1592
de103c93 1593 switch (sense_reason) {
03e98c9e
NB		 1594 case TCM_NON_EXISTENT_LUN:
1595 case TCM_UNSUPPORTED_SCSI_OPCODE:
1596 case TCM_INVALID_CDB_FIELD:
1597 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1598 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1599 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1600 case TCM_UNKNOWN_MODE_PAGE:
1601 case TCM_WRITE_PROTECTED:
e2397c70 1602 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1603 case TCM_CHECK_CONDITION_ABORT_CMD:
1604 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1605 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1606 break;
de103c93
CH		 1607 case TCM_OUT_OF_RESOURCES:
1608 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1609 break;
03e98c9e 1610 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1611 /*
1612 * No SENSE Data payload for this case, set SCSI Status
1613 * and queue the response to $FABRIC_MOD.
1614 *
1615 * Uses linux/include/scsi/scsi.h SAM status codes defs
1616 */
1617 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1618 /*
1619 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1620 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1621 * CONFLICT STATUS.
1622 *
1623 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1624 */
e3d6f909 1625 if (cmd->se_sess &&
0fd97ccf 1626 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1627 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1628 cmd->orig_fe_lun, 0x2C,
1629 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1630
e5c0d6ad
RD		 1631 trace_target_cmd_complete(cmd);
1632 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1633 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1634 goto queue_full;
c66ac9db 1635 goto check_stop;
c66ac9db 1636 default:
6708bb27 1637 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1638 cmd->t_task_cdb[0], sense_reason);
1639 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1640 break;
1641 }
f3146437 1642
de103c93 1643 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1644 if (ret == -EAGAIN || ret == -ENOMEM)
1645 goto queue_full;
07bde79a 1646
c66ac9db
NB		 1647check_stop:
1648 transport_lun_remove_cmd(cmd);
6708bb27 1649 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1650 ;
07bde79a
NB		 1651 return;
1652
1653queue_full:
e057f533
CH		 1654 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1655 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1656}
2fbff127 1657EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1658
76dde50e 1659void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1660{
de103c93 1661 sense_reason_t ret;
5f41a31d 1662
de103c93
CH		 1663 if (cmd->execute_cmd) {
1664 ret = cmd->execute_cmd(cmd);
1665 if (ret) {
1666 spin_lock_irq(&cmd->t_state_lock);
1667 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1668 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1669
de103c93
CH		 1670 transport_generic_request_failure(cmd, ret);
1671 }
5f41a31d
CH		 1672 }
1673}
1674
019c4ca6 1675static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1676{
1677 struct se_device *dev = cmd->se_dev;
1678
019c4ca6
CH		 1679 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1680 return false;
5f41a31d 1681
c66ac9db 1682 /*
25985edc 1683 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1684 * to allow the passed struct se_cmd list of tasks to the front of the list.
1685 */
5f41a31d
CH		 1686 switch (cmd->sam_task_attr) {
1687 case MSG_HEAD_TAG:
1688 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1689 "se_ordered_id: %u\n",
1690 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1691 return false;
5f41a31d
CH		 1692 case MSG_ORDERED_TAG:
1693 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1694 smp_mb__after_atomic_inc();
1695
5f41a31d
CH		 1696 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1697 " se_ordered_id: %u\n",
1698 cmd->t_task_cdb[0], cmd->se_ordered_id);
1699
c66ac9db 1700 /*
5f41a31d
CH		 1701 * Execute an ORDERED command if no other older commands
1702 * exist that need to be completed first.
c66ac9db 1703 */
5f41a31d 1704 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1705 return false;
5f41a31d
CH		 1706 break;
1707 default:
c66ac9db
NB		 1708 /*
1709 * For SIMPLE and UNTAGGED Task Attribute commands
1710 */
5f41a31d 1711 atomic_inc(&dev->simple_cmds);
c66ac9db 1712 smp_mb__after_atomic_inc();
5f41a31d 1713 break;
c66ac9db 1714 }
5f41a31d 1715
019c4ca6
CH		 1716 if (atomic_read(&dev->dev_ordered_sync) == 0)
1717 return false;
c66ac9db 1718
019c4ca6
CH		 1719 spin_lock(&dev->delayed_cmd_lock);
1720 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1721 spin_unlock(&dev->delayed_cmd_lock);
1722
1723 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1724 " delayed CMD list, se_ordered_id: %u\n",
1725 cmd->t_task_cdb[0], cmd->sam_task_attr,
1726 cmd->se_ordered_id);
1727 return true;
1728}
1729
1730void target_execute_cmd(struct se_cmd *cmd)
1731{
1732 /*
1733 * If the received CDB has aleady been aborted stop processing it here.
1734 */
4a9a6c8d 1735 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1736 return;
c66ac9db 1737
019c4ca6
CH		 1738 /*
1739 * Determine if frontend context caller is requesting the stopping of
1740 * this command for frontend exceptions.
1741 */
4a9a6c8d 1742 spin_lock_irq(&cmd->t_state_lock);
019c4ca6
CH		 1743 if (cmd->transport_state & CMD_T_STOP) {
1744 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1745 __func__, __LINE__,
1746 cmd->se_tfo->get_task_tag(cmd));
1747
1748 spin_unlock_irq(&cmd->t_state_lock);
1749 complete(&cmd->t_transport_stop_comp);
1750 return;
1751 }
1752
1753 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1754 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6
CH		 1755 spin_unlock_irq(&cmd->t_state_lock);
1756
1a398b97
NB		 1757 if (target_handle_task_attr(cmd)) {
1758 spin_lock_irq(&cmd->t_state_lock);
1759 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1760 spin_unlock_irq(&cmd->t_state_lock);
1761 return;
1762 }
1763
1764 __target_execute_cmd(cmd);
c66ac9db 1765}
70baf0ab 1766EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1767
5f41a31d
CH		 1768/*
1769 * Process all commands up to the last received ORDERED task attribute which
1770 * requires another blocking boundary
1771 */
1772static void target_restart_delayed_cmds(struct se_device *dev)
1773{
1774 for (;;) {
1775 struct se_cmd *cmd;
1776
1777 spin_lock(&dev->delayed_cmd_lock);
1778 if (list_empty(&dev->delayed_cmd_list)) {
1779 spin_unlock(&dev->delayed_cmd_lock);
1780 break;
1781 }
1782
1783 cmd = list_entry(dev->delayed_cmd_list.next,
1784 struct se_cmd, se_delayed_node);
1785 list_del(&cmd->se_delayed_node);
1786 spin_unlock(&dev->delayed_cmd_lock);
1787
1788 __target_execute_cmd(cmd);
1789
1790 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1791 break;
1792 }
1793}
1794
c66ac9db 1795/*
35e0e757 1796 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1797 * and ordered cmds need to have their tasks added to the execution queue.
1798 */
1799static void transport_complete_task_attr(struct se_cmd *cmd)
1800{
5951146d 1801 struct se_device *dev = cmd->se_dev;
c66ac9db 1802
019c4ca6
CH		 1803 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1804 return;
1805
e66ecd50 1806 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1807 atomic_dec(&dev->simple_cmds);
1808 smp_mb__after_atomic_dec();
1809 dev->dev_cur_ordered_id++;
6708bb27 1810 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1811 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1812 cmd->se_ordered_id);
e66ecd50 1813 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1814 dev->dev_cur_ordered_id++;
6708bb27 1815 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1816 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1817 cmd->se_ordered_id);
e66ecd50 1818 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1819 atomic_dec(&dev->dev_ordered_sync);
1820 smp_mb__after_atomic_dec();
c66ac9db
NB		 1821
1822 dev->dev_cur_ordered_id++;
6708bb27 1823 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1824 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1825 }
c66ac9db 1826
5f41a31d 1827 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1828}
1829
e057f533 1830static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1831{
1832 int ret = 0;
1833
019c4ca6 1834 transport_complete_task_attr(cmd);
e057f533
CH		 1835
1836 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1837 trace_target_cmd_complete(cmd);
e057f533
CH		 1838 ret = cmd->se_tfo->queue_status(cmd);
1839 if (ret)
1840 goto out;
1841 }
07bde79a
NB		 1842
1843 switch (cmd->data_direction) {
1844 case DMA_FROM_DEVICE:
e5c0d6ad 1845 trace_target_cmd_complete(cmd);
07bde79a
NB		 1846 ret = cmd->se_tfo->queue_data_in(cmd);
1847 break;
1848 case DMA_TO_DEVICE:
64577407 1849 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a
NB		 1850 ret = cmd->se_tfo->queue_data_in(cmd);
1851 if (ret < 0)
e057f533 1852 break;
07bde79a
NB		 1853 }
1854 /* Fall through for DMA_TO_DEVICE */
1855 case DMA_NONE:
e5c0d6ad 1856 trace_target_cmd_complete(cmd);
07bde79a
NB		 1857 ret = cmd->se_tfo->queue_status(cmd);
1858 break;
1859 default:
1860 break;
1861 }
1862
e057f533
CH		 1863out:
1864 if (ret < 0) {
1865 transport_handle_queue_full(cmd, cmd->se_dev);
1866 return;
1867 }
1868 transport_lun_remove_cmd(cmd);
1869 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1870}
1871
1872static void transport_handle_queue_full(
1873 struct se_cmd *cmd,
e057f533 1874 struct se_device *dev)
07bde79a
NB		 1875{
1876 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1877 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1878 atomic_inc(&dev->dev_qf_count);
1879 smp_mb__after_atomic_inc();
1880 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1881
1882 schedule_work(&cmd->se_dev->qf_work_queue);
1883}
1884
35e0e757 1885static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1886{
35e0e757 1887 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1888 int ret;
35e0e757 1889
c66ac9db
NB		 1890 /*
1891 * Check if we need to move delayed/dormant tasks from cmds on the
1892 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1893 * Attribute.
1894 */
019c4ca6
CH		 1895 transport_complete_task_attr(cmd);
1896
07bde79a
NB		 1897 /*
1898 * Check to schedule QUEUE_FULL work, or execute an existing
1899 * cmd->transport_qf_callback()
1900 */
1901 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1902 schedule_work(&cmd->se_dev->qf_work_queue);
1903
c66ac9db 1904 /*
d5829eac 1905 * Check if we need to send a sense buffer from
c66ac9db
NB		 1906 * the struct se_cmd in question.
1907 */
1908 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1909 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1910 ret = transport_send_check_condition_and_sense(
1911 cmd, 0, 1);
1912 if (ret == -EAGAIN || ret == -ENOMEM)
1913 goto queue_full;
1914
1915 transport_lun_remove_cmd(cmd);
1916 transport_cmd_check_stop_to_fabric(cmd);
1917 return;
c66ac9db
NB		 1918 }
1919 /*
25985edc 1920 * Check for a callback, used by amongst other things
a6b0133c 1921 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 1922 */
a6b0133c
NB		 1923 if (cmd->transport_complete_callback) {
1924 sense_reason_t rc;
1925
1926 rc = cmd->transport_complete_callback(cmd);
a2890087 1927 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
a6b0133c 1928 return;
a2890087
NB		 1929 } else if (rc) {
1930 ret = transport_send_check_condition_and_sense(cmd,
1931 rc, 0);
1932 if (ret == -EAGAIN || ret == -ENOMEM)
1933 goto queue_full;
a6b0133c 1934
a2890087
NB		 1935 transport_lun_remove_cmd(cmd);
1936 transport_cmd_check_stop_to_fabric(cmd);
1937 return;
1938 }
a6b0133c 1939 }
c66ac9db
NB		 1940
1941 switch (cmd->data_direction) {
1942 case DMA_FROM_DEVICE:
1943 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1944 if (cmd->se_lun->lun_sep) {
1945 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1946 cmd->data_length;
1947 }
1948 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1949
e5c0d6ad 1950 trace_target_cmd_complete(cmd);
07bde79a 1951 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1952 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1953 goto queue_full;
c66ac9db
NB		 1954 break;
1955 case DMA_TO_DEVICE:
1956 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1957 if (cmd->se_lun->lun_sep) {
1958 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1959 cmd->data_length;
1960 }
1961 spin_unlock(&cmd->se_lun->lun_sep_lock);
1962 /*
1963 * Check if we need to send READ payload for BIDI-COMMAND
1964 */
64577407 1965 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 1966 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1967 if (cmd->se_lun->lun_sep) {
1968 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1969 cmd->data_length;
1970 }
1971 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1972 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1973 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1974 goto queue_full;
c66ac9db
NB		 1975 break;
1976 }
1977 /* Fall through for DMA_TO_DEVICE */
1978 case DMA_NONE:
e5c0d6ad 1979 trace_target_cmd_complete(cmd);
07bde79a 1980 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1981 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1982 goto queue_full;
c66ac9db
NB		 1983 break;
1984 default:
1985 break;
1986 }
1987
1988 transport_lun_remove_cmd(cmd);
1989 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1990 return;
1991
1992queue_full:
6708bb27 1993 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1994 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1995 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1996 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1997}
1998
6708bb27 1999static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2000{
ec98f782 2001 struct scatterlist *sg;
ec98f782 2002 int count;
c66ac9db 2003
6708bb27
AG		 2004 for_each_sg(sgl, sg, nents, count)
2005 __free_page(sg_page(sg));
c66ac9db 2006
6708bb27
AG		 2007 kfree(sgl);
2008}
c66ac9db 2009
47e459e6
NB		 2010static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2011{
2012 /*
2013 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2014 * emulation, and free + reset pointers if necessary..
2015 */
2016 if (!cmd->t_data_sg_orig)
2017 return;
2018
2019 kfree(cmd->t_data_sg);
2020 cmd->t_data_sg = cmd->t_data_sg_orig;
2021 cmd->t_data_sg_orig = NULL;
2022 cmd->t_data_nents = cmd->t_data_nents_orig;
2023 cmd->t_data_nents_orig = 0;
2024}
2025
6708bb27
AG		 2026static inline void transport_free_pages(struct se_cmd *cmd)
2027{
47e459e6
NB		 2028 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2029 transport_reset_sgl_orig(cmd);
6708bb27 2030 return;
47e459e6
NB		 2031 }
2032 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2033
2034 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2035 cmd->t_data_sg = NULL;
2036 cmd->t_data_nents = 0;
c66ac9db 2037
6708bb27 2038 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2039 cmd->t_bidi_data_sg = NULL;
2040 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2041}
2042
e26d99ae
CH		 2043/**
2044 * transport_release_cmd - free a command
2045 * @cmd: command to free
2046 *
2047 * This routine unconditionally frees a command, and reference counting
2048 * or list removal must be done in the caller.
2049 */
d5ddad41 2050static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2051{
2052 BUG_ON(!cmd->se_tfo);
2053
c8e31f26 2054 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2055 core_tmr_release_req(cmd->se_tmr_req);
2056 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2057 kfree(cmd->t_task_cdb);
2058 /*
7481deb4
NB		 2059 * If this cmd has been setup with target_get_sess_cmd(), drop
2060 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2061 */
ca24976a 2062 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2063}
2064
d3df7825
CH		 2065/**
2066 * transport_put_cmd - release a reference to a command
2067 * @cmd: command to release
2068 *
2069 * This routine releases our reference to the command and frees it if possible.
2070 */
d5ddad41 2071static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2072{
c66ac9db 2073 transport_free_pages(cmd);
d5ddad41 2074 return transport_release_cmd(cmd);
c66ac9db 2075}
c66ac9db 2076
4949314c 2077void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2078{
ec98f782 2079 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2080 struct page **pages;
2081 int i;
05d1c7c0
AG		 2082
2083 /*
ec98f782
AG		 2084 * We need to take into account a possible offset here for fabrics like
2085 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2086 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2087 */
4949314c
AG		 2088 if (!cmd->t_data_nents)
2089 return NULL;
3717ef0c
PB		 2090
2091 BUG_ON(!sg);
2092 if (cmd->t_data_nents == 1)
4949314c
AG		 2093 return kmap(sg_page(sg)) + sg->offset;
2094
2095 /* >1 page. use vmap */
2096 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2097 if (!pages)
4949314c
AG		 2098 return NULL;
2099
2100 /* convert sg[] to pages[] */
2101 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2102 pages[i] = sg_page(sg);
2103 }
2104
2105 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2106 kfree(pages);
de103c93 2107 if (!cmd->t_data_vmap)
4949314c
AG		 2108 return NULL;
2109
2110 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2111}
4949314c 2112EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2113
4949314c 2114void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2115{
a1edf9cf 2116 if (!cmd->t_data_nents) {
4949314c 2117 return;
a1edf9cf 2118 } else if (cmd->t_data_nents == 1) {
4949314c 2119 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2120 return;
2121 }
4949314c
AG		 2122
2123 vunmap(cmd->t_data_vmap);
2124 cmd->t_data_vmap = NULL;
05d1c7c0 2125}
4949314c 2126EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2127
c5ff8d6b 2128int
20093994
NB		 2129target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2130 bool zero_page)
c66ac9db 2131{
20093994 2132 struct scatterlist *sg;
ec98f782 2133 struct page *page;
20093994
NB		 2134 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2135 unsigned int nent;
ec98f782 2136 int i = 0;
c66ac9db 2137
20093994
NB		 2138 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2139 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2140 if (!sg)
ec98f782 2141 return -ENOMEM;
c66ac9db 2142
20093994 2143 sg_init_table(sg, nent);
9db9da33 2144
ec98f782
AG		 2145 while (length) {
2146 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2147 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2148 if (!page)
2149 goto out;
c66ac9db 2150
20093994 2151 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2152 length -= page_len;
2153 i++;
c66ac9db 2154 }
20093994
NB		 2155 *sgl = sg;
2156 *nents = nent;
c66ac9db 2157 return 0;
c66ac9db 2158
ec98f782 2159out:
d0e27c88 2160 while (i > 0) {
ec98f782 2161 i--;
20093994 2162 __free_page(sg_page(&sg[i]));
c66ac9db 2163 }
20093994 2164 kfree(sg);
ec98f782 2165 return -ENOMEM;
c66ac9db
NB		 2166}
2167
da0f7619 2168/*
b16a35b0
AG		 2169 * Allocate any required resources to execute the command. For writes we
2170 * might not have the payload yet, so notify the fabric via a call to
2171 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2172 */
de103c93
CH		 2173sense_reason_t
2174transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2175{
c66ac9db
NB		 2176 int ret = 0;
2177
2178 /*
2179 * Determine is the TCM fabric module has already allocated physical
2180 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2181 * beforehand.
c66ac9db 2182 */
ec98f782
AG		 2183 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2184 cmd->data_length) {
20093994
NB		 2185 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2186
8cefe07b
NB		 2187 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2188 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2189 u32 bidi_length;
2190
2191 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2192 bidi_length = cmd->t_task_nolb *
2193 cmd->se_dev->dev_attrib.block_size;
2194 else
2195 bidi_length = cmd->data_length;
2196
2197 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2198 &cmd->t_bidi_data_nents,
2199 bidi_length, zero_flag);
2200 if (ret < 0)
2201 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2202 }
2203
20093994
NB		 2204 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2205 cmd->data_length, zero_flag);
c66ac9db 2206 if (ret < 0)
de103c93 2207 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2208 }
c66ac9db 2209 /*
c3196f0c
CH		 2210 * If this command is not a write we can execute it right here,
2211 * for write buffers we need to notify the fabric driver first
2212 * and let it call back once the write buffers are ready.
c66ac9db 2213 */
5f41a31d 2214 target_add_to_state_list(cmd);
c3196f0c
CH		 2215 if (cmd->data_direction != DMA_TO_DEVICE) {
2216 target_execute_cmd(cmd);
2217 return 0;
2218 }
862e6389 2219 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2220
2221 ret = cmd->se_tfo->write_pending(cmd);
2222 if (ret == -EAGAIN || ret == -ENOMEM)
2223 goto queue_full;
2224
de103c93
CH		 2225 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2226 WARN_ON(ret);
2227
b69c1fcf 2228 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2229
c3196f0c
CH		 2230queue_full:
2231 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2232 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2233 transport_handle_queue_full(cmd, cmd->se_dev);
2234 return 0;
c66ac9db 2235}
a1d8b49a 2236EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2237
e057f533 2238static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2239{
f147abb4
NB		 2240 int ret;
2241
2242 ret = cmd->se_tfo->write_pending(cmd);
2243 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2244 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2245 cmd);
2246 transport_handle_queue_full(cmd, cmd->se_dev);
2247 }
07bde79a
NB		 2248}
2249
d5ddad41 2250int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2251{
c130480b 2252 unsigned long flags;
d5ddad41
NB		 2253 int ret = 0;
2254
d14921d6 2255 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2256 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2257 transport_wait_for_tasks(cmd);
2258
d5ddad41 2259 ret = transport_release_cmd(cmd);
d14921d6
NB		 2260 } else {
2261 if (wait_for_tasks)
2262 transport_wait_for_tasks(cmd);
c130480b
NB		 2263 /*
2264 * Handle WRITE failure case where transport_generic_new_cmd()
2265 * has already added se_cmd to state_list, but fabric has
2266 * failed command before I/O submission.
2267 */
2268 if (cmd->state_active) {
2269 spin_lock_irqsave(&cmd->t_state_lock, flags);
2270 target_remove_from_state_list(cmd);
2271 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2272 }
d14921d6 2273
82f1c8a4 2274 if (cmd->se_lun)
c66ac9db 2275 transport_lun_remove_cmd(cmd);
c66ac9db 2276
d5ddad41 2277 ret = transport_put_cmd(cmd);
c66ac9db 2278 }
d5ddad41 2279 return ret;
c66ac9db
NB		 2280}
2281EXPORT_SYMBOL(transport_generic_free_cmd);
2282
a17f091d
NB		 2283/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2284 * @se_sess: session to reference
2285 * @se_cmd: command descriptor to add
a6360785 2286 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2287 */
20361e69 2288int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2289 bool ack_kref)
a17f091d
NB		 2290{
2291 unsigned long flags;
bc187ea6 2292 int ret = 0;
a17f091d 2293
7481deb4 2294 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2295 /*
2296 * Add a second kref if the fabric caller is expecting to handle
2297 * fabric acknowledgement that requires two target_put_sess_cmd()
2298 * invocations before se_cmd descriptor release.
2299 */
86715569 2300 if (ack_kref == true) {
a6360785 2301 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2302 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2303 }
7481deb4 2304
a17f091d 2305 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2306 if (se_sess->sess_tearing_down) {
2307 ret = -ESHUTDOWN;
2308 goto out;
2309 }
a17f091d 2310 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2311out:
a17f091d 2312 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2313 return ret;
a17f091d 2314}
20361e69 2315EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2316
7481deb4 2317static void target_release_cmd_kref(struct kref *kref)
a17f091d 2318{
7481deb4
NB		 2319 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2320 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2321
a17f091d 2322 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2323 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2324 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2325 return;
a17f091d 2326 }
a17f091d 2327 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2328 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2329 complete(&se_cmd->cmd_wait_comp);
7481deb4 2330 return;
a17f091d
NB		 2331 }
2332 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2333 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2334
7481deb4
NB		 2335 se_cmd->se_tfo->release_cmd(se_cmd);
2336}
2337
2338/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2339 * @se_sess: session to reference
2340 * @se_cmd: command descriptor to drop
2341 */
2342int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2343{
ccf5ae83
JE		 2344 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2345 &se_sess->sess_cmd_lock);
a17f091d
NB		 2346}
2347EXPORT_SYMBOL(target_put_sess_cmd);
2348
1c7b13fe
RD		 2349/* target_sess_cmd_list_set_waiting - Flag all commands in
2350 * sess_cmd_list to complete cmd_wait_comp. Set
2351 * sess_tearing_down so no more commands are queued.
2352 * @se_sess: session to flag
a17f091d 2353 */
1c7b13fe 2354void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2355{
2356 struct se_cmd *se_cmd;
2357 unsigned long flags;
2358
a17f091d 2359 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2360 if (se_sess->sess_tearing_down) {
2361 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2362 return;
2363 }
1c7b13fe 2364 se_sess->sess_tearing_down = 1;
9b31a328 2365 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2366
9b31a328 2367 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2368 se_cmd->cmd_wait_set = 1;
2369
2370 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2371}
1c7b13fe 2372EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2373
2374/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2375 * @se_sess: session to wait for active I/O
a17f091d 2376 */
be646c2d 2377void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2378{
2379 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2380 unsigned long flags;
a17f091d
NB		 2381
2382 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2383 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2384 list_del(&se_cmd->se_cmd_list);
2385
2386 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2387 " %d\n", se_cmd, se_cmd->t_state,
2388 se_cmd->se_tfo->get_cmd_state(se_cmd));
2389
be646c2d
JE		 2390 wait_for_completion(&se_cmd->cmd_wait_comp);
2391 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2392 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2393 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2394
2395 se_cmd->se_tfo->release_cmd(se_cmd);
2396 }
9b31a328
NB		 2397
2398 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2399 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2400 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2401
a17f091d
NB		 2402}
2403EXPORT_SYMBOL(target_wait_for_sess_cmds);
2404
5277797d 2405static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2406{
8359cf43 2407 struct se_lun *lun = p;
c66ac9db 2408
5277797d
NB		 2409 percpu_ref_kill(&lun->lun_ref);
2410
2411 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2412 complete(&lun->lun_shutdown_comp);
2413
2414 return 0;
2415}
2416
5277797d 2417int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2418{
2419 struct task_struct *kt;
2420
5277797d 2421 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2422 "tcm_cl_%u", lun->unpacked_lun);
2423 if (IS_ERR(kt)) {
6708bb27 2424 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2425 return PTR_ERR(kt);
c66ac9db
NB		 2426 }
2427 wait_for_completion(&lun->lun_shutdown_comp);
2428
2429 return 0;
2430}
2431
d14921d6
NB		 2432/**
2433 * transport_wait_for_tasks - wait for completion to occur
2434 * @cmd: command to wait
c66ac9db 2435 *
d14921d6
NB		 2436 * Called from frontend fabric context to wait for storage engine
2437 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2438 */
a17f091d 2439bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2440{
2441 unsigned long flags;
2442
a1d8b49a 2443 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2444 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2445 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2446 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2447 return false;
d14921d6 2448 }
cb4f4d3c 2449
c8e31f26
AG		 2450 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2451 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2452 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2453 return false;
d14921d6 2454 }
7d680f3b 2455
3d28934a 2456 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2457 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2458 return false;
d14921d6 2459 }
c66ac9db 2460
7d680f3b 2461 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2462
6708bb27 2463 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2464 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2465 cmd, cmd->se_tfo->get_task_tag(cmd),
2466 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2467
a1d8b49a 2468 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2469
a1d8b49a 2470 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2471
a1d8b49a 2472 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2473 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2474
35d1efe8 2475 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2476 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2477 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2478
d14921d6 2479 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2480
2481 return true;
c66ac9db 2482}
d14921d6 2483EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2484
2485static int transport_get_sense_codes(
2486 struct se_cmd *cmd,
2487 u8 *asc,
2488 u8 *ascq)
2489{
2490 *asc = cmd->scsi_asc;
2491 *ascq = cmd->scsi_ascq;
2492
2493 return 0;
2494}
2495
76736db3
SG		 2496static
2497void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2498{
2499 /* Place failed LBA in sense data information descriptor 0. */
2500 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2501 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2502 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2503 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2504
2505 /* Descriptor Information: failing sector */
2506 put_unaligned_be64(bad_sector, &buffer[12]);
2507}
2508
de103c93
CH		 2509int
2510transport_send_check_condition_and_sense(struct se_cmd *cmd,
2511 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2512{
2513 unsigned char *buffer = cmd->sense_buffer;
2514 unsigned long flags;
c66ac9db
NB		 2515 u8 asc = 0, ascq = 0;
2516
a1d8b49a 2517 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2518 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2519 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2520 return 0;
2521 }
2522 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2523 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2524
2525 if (!reason && from_transport)
2526 goto after_reason;
2527
2528 if (!from_transport)
2529 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2530
c66ac9db
NB		 2531 /*
2532 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2533 * SENSE KEY values from include/scsi/scsi.h
2534 */
2535 switch (reason) {
ba829137
HR		 2536 case TCM_NO_SENSE:
2537 /* CURRENT ERROR */
2538 buffer[0] = 0x70;
2539 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2540 /* Not Ready */
2541 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2542 /* NO ADDITIONAL SENSE INFORMATION */
2543 buffer[SPC_ASC_KEY_OFFSET] = 0;
2544 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2545 break;
c66ac9db 2546 case TCM_NON_EXISTENT_LUN:
eb39d340 2547 /* CURRENT ERROR */
9c58b7dd
RD		 2548 buffer[0] = 0x70;
2549 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2550 /* ILLEGAL REQUEST */
9c58b7dd 2551 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2552 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2553 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2554 break;
c66ac9db
NB		 2555 case TCM_UNSUPPORTED_SCSI_OPCODE:
2556 case TCM_SECTOR_COUNT_TOO_MANY:
2557 /* CURRENT ERROR */
9c58b7dd
RD		 2558 buffer[0] = 0x70;
2559 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2560 /* ILLEGAL REQUEST */
9c58b7dd 2561 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2562 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2563 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2564 break;
2565 case TCM_UNKNOWN_MODE_PAGE:
2566 /* CURRENT ERROR */
9c58b7dd
RD		 2567 buffer[0] = 0x70;
2568 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2569 /* ILLEGAL REQUEST */
9c58b7dd 2570 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2571 /* INVALID FIELD IN CDB */
9c58b7dd 2572 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2573 break;
2574 case TCM_CHECK_CONDITION_ABORT_CMD:
2575 /* CURRENT ERROR */
9c58b7dd
RD		 2576 buffer[0] = 0x70;
2577 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2578 /* ABORTED COMMAND */
9c58b7dd 2579 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2580 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2581 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2582 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2583 break;
2584 case TCM_INCORRECT_AMOUNT_OF_DATA:
2585 /* CURRENT ERROR */
9c58b7dd
RD		 2586 buffer[0] = 0x70;
2587 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2588 /* ABORTED COMMAND */
9c58b7dd 2589 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2590 /* WRITE ERROR */
9c58b7dd 2591 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2592 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2593 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2594 break;
2595 case TCM_INVALID_CDB_FIELD:
2596 /* CURRENT ERROR */
9c58b7dd
RD		 2597 buffer[0] = 0x70;
2598 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2599 /* ILLEGAL REQUEST */
9c58b7dd 2600 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2601 /* INVALID FIELD IN CDB */
9c58b7dd 2602 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2603 break;
2604 case TCM_INVALID_PARAMETER_LIST:
2605 /* CURRENT ERROR */
9c58b7dd
RD		 2606 buffer[0] = 0x70;
2607 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2608 /* ILLEGAL REQUEST */
9c58b7dd 2609 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2610 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2611 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2612 break;
bb992e72
RD		 2613 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2614 /* CURRENT ERROR */
2615 buffer[0] = 0x70;
2616 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2617 /* ILLEGAL REQUEST */
2618 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2619 /* PARAMETER LIST LENGTH ERROR */
2620 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2621 break;
c66ac9db
NB		 2622 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2623 /* CURRENT ERROR */
9c58b7dd
RD		 2624 buffer[0] = 0x70;
2625 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2626 /* ABORTED COMMAND */
9c58b7dd 2627 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2628 /* WRITE ERROR */
9c58b7dd 2629 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2630 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2631 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2632 break;
2633 case TCM_SERVICE_CRC_ERROR:
2634 /* CURRENT ERROR */
9c58b7dd
RD		 2635 buffer[0] = 0x70;
2636 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2637 /* ABORTED COMMAND */
9c58b7dd 2638 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2639 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2640 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2641 /* N/A */
9c58b7dd 2642 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2643 break;
2644 case TCM_SNACK_REJECTED:
2645 /* CURRENT ERROR */
9c58b7dd
RD		 2646 buffer[0] = 0x70;
2647 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2648 /* ABORTED COMMAND */
9c58b7dd 2649 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2650 /* READ ERROR */
9c58b7dd 2651 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2652 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2653 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2654 break;
2655 case TCM_WRITE_PROTECTED:
2656 /* CURRENT ERROR */
9c58b7dd
RD		 2657 buffer[0] = 0x70;
2658 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2659 /* DATA PROTECT */
9c58b7dd 2660 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2661 /* WRITE PROTECTED */
9c58b7dd 2662 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2663 break;
e2397c70
RD		 2664 case TCM_ADDRESS_OUT_OF_RANGE:
2665 /* CURRENT ERROR */
9c58b7dd
RD		 2666 buffer[0] = 0x70;
2667 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2668 /* ILLEGAL REQUEST */
9c58b7dd 2669 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2670 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2671 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2672 break;
c66ac9db
NB		 2673 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2674 /* CURRENT ERROR */
9c58b7dd
RD		 2675 buffer[0] = 0x70;
2676 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2677 /* UNIT ATTENTION */
9c58b7dd 2678 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2679 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2680 buffer[SPC_ASC_KEY_OFFSET] = asc;
2681 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2682 break;
2683 case TCM_CHECK_CONDITION_NOT_READY:
2684 /* CURRENT ERROR */
9c58b7dd
RD		 2685 buffer[0] = 0x70;
2686 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2687 /* Not Ready */
9c58b7dd 2688 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2689 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2690 buffer[SPC_ASC_KEY_OFFSET] = asc;
2691 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2692 break;
818b571c
NB		 2693 case TCM_MISCOMPARE_VERIFY:
2694 /* CURRENT ERROR */
2695 buffer[0] = 0x70;
2696 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2697 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2698 /* MISCOMPARE DURING VERIFY OPERATION */
2699 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2700 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2701 break;
fcc4f17b
NB		 2702 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2703 /* CURRENT ERROR */
2704 buffer[0] = 0x70;
2705 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2706 /* ILLEGAL REQUEST */
2707 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2708 /* LOGICAL BLOCK GUARD CHECK FAILED */
2709 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2710 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
76736db3 2711 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2712 break;
2713 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2714 /* CURRENT ERROR */
2715 buffer[0] = 0x70;
2716 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2717 /* ILLEGAL REQUEST */
2718 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2719 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2720 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2721 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
76736db3 2722 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2723 break;
2724 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2725 /* CURRENT ERROR */
2726 buffer[0] = 0x70;
2727 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2728 /* ILLEGAL REQUEST */
2729 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2730 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2731 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2732 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
76736db3 2733 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b 2734 break;
c66ac9db
NB		 2735 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2736 default:
2737 /* CURRENT ERROR */
9c58b7dd
RD		 2738 buffer[0] = 0x70;
2739 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2740 /*
2741 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2742 * Solaris initiators. Returning NOT READY instead means the
2743 * operations will be retried a finite number of times and we
2744 * can survive intermittent errors.
2745 */
2746 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2747 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2748 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2749 break;
2750 }
2751 /*
2752 * This code uses linux/include/scsi/scsi.h SAM status codes!
2753 */
2754 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2755 /*
2756 * Automatically padded, this value is encoded in the fabric's
2757 * data_length response PDU containing the SCSI defined sense data.
2758 */
9c58b7dd 2759 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2760
2761after_reason:
e5c0d6ad 2762 trace_target_cmd_complete(cmd);
07bde79a 2763 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2764}
2765EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2766
2767int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2768{
c18bc7d8
RD		 2769 if (!(cmd->transport_state & CMD_T_ABORTED))
2770 return 0;
c66ac9db 2771
c18bc7d8
RD		 2772 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2773 return 1;
8b1e1244 2774
c18bc7d8
RD		 2775 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2776 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2777
c18bc7d8 2778 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
29f4c090 2779 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2780 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2781 cmd->se_tfo->queue_status(cmd);
2782
2783 return 1;
c66ac9db
NB		 2784}
2785EXPORT_SYMBOL(transport_check_aborted_status);
2786
2787void transport_send_task_abort(struct se_cmd *cmd)
2788{
c252f003
NB		 2789 unsigned long flags;
2790
2791 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2792 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2793 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2794 return;
2795 }
2796 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2797
c66ac9db
NB		 2798 /*
2799 * If there are still expected incoming fabric WRITEs, we wait
2800 * until until they have completed before sending a TASK_ABORTED
2801 * response. This response with TASK_ABORTED status will be
2802 * queued back to fabric module by transport_check_aborted_status().
2803 */
2804 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2805 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2806 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2807 smp_mb__after_atomic_inc();
29f4c090 2808 return;
c66ac9db
NB		 2809 }
2810 }
2811 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2812
72b59d6e
RD		 2813 transport_lun_remove_cmd(cmd);
2814
6708bb27 2815 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2816 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2817 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2818
e5c0d6ad 2819 trace_target_cmd_complete(cmd);
e3d6f909 2820 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2821}
2822
af877292 2823static void target_tmr_work(struct work_struct *work)
c66ac9db 2824{
af877292 2825 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2826 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2827 struct se_tmr_req *tmr = cmd->se_tmr_req;
2828 int ret;
2829
2830 switch (tmr->function) {
5c6cd613 2831 case TMR_ABORT_TASK:
3d28934a 2832 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2833 break;
5c6cd613
NB		 2834 case TMR_ABORT_TASK_SET:
2835 case TMR_CLEAR_ACA:
2836 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2837 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2838 break;
5c6cd613 2839 case TMR_LUN_RESET:
c66ac9db
NB		 2840 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2841 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2842 TMR_FUNCTION_REJECTED;
2843 break;
5c6cd613 2844 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2845 tmr->response = TMR_FUNCTION_REJECTED;
2846 break;
5c6cd613 2847 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2848 tmr->response = TMR_FUNCTION_REJECTED;
2849 break;
c66ac9db 2850 default:
6708bb27 2851 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2852 tmr->function);
2853 tmr->response = TMR_FUNCTION_REJECTED;
2854 break;
2855 }
2856
2857 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2858 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2859
b7b8bef7 2860 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2861}
2862
af877292
CH		 2863int transport_generic_handle_tmr(
2864 struct se_cmd *cmd)
c66ac9db 2865{
af877292
CH		 2866 INIT_WORK(&cmd->work, target_tmr_work);
2867 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2868 return 0;
2869}
af877292 2870EXPORT_SYMBOL(transport_generic_handle_tmr);