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[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
c66ac9db
NB		 37#include <asm/unaligned.h>
38#include <net/sock.h>
39#include <net/tcp.h>
40#include <scsi/scsi.h>
41#include <scsi/scsi_cmnd.h>
e66ecd50 42#include <scsi/scsi_tcq.h>
c66ac9db
NB		 43
44#include <target/target_core_base.h>
c4795fb2
CH		 45#include <target/target_core_backend.h>
46#include <target/target_core_fabric.h>
c66ac9db
NB		 47#include <target/target_core_configfs.h>
48
e26d99ae 49#include "target_core_internal.h"
c66ac9db 50#include "target_core_alua.h"
c66ac9db 51#include "target_core_pr.h"
c66ac9db
NB		 52#include "target_core_ua.h"
53
e5c0d6ad
RD		 54#define CREATE_TRACE_POINTS
55#include <trace/events/target.h>
56
35e0e757 57static struct workqueue_struct *target_completion_wq;
c66ac9db 58static struct kmem_cache *se_sess_cache;
c66ac9db 59struct kmem_cache *se_ua_cache;
c66ac9db
NB		 60struct kmem_cache *t10_pr_reg_cache;
61struct kmem_cache *t10_alua_lu_gp_cache;
62struct kmem_cache *t10_alua_lu_gp_mem_cache;
63struct kmem_cache *t10_alua_tg_pt_gp_cache;
64struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
229d4f11
HR		 65struct kmem_cache *t10_alua_lba_map_cache;
66struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 67
c66ac9db 68static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 69static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 70 struct se_device *dev);
d5ddad41 71static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 72static void target_complete_ok_work(struct work_struct *work);
c66ac9db 73
e3d6f909 74int init_se_kmem_caches(void)
c66ac9db 75{
c66ac9db
NB		 76 se_sess_cache = kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session), __alignof__(struct se_session),
78 0, NULL);
6708bb27
AG		 79 if (!se_sess_cache) {
80 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 81 " failed\n");
c8e31f26 82 goto out;
c66ac9db
NB		 83 }
84 se_ua_cache = kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua), __alignof__(struct se_ua),
86 0, NULL);
6708bb27
AG		 87 if (!se_ua_cache) {
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 89 goto out_free_sess_cache;
c66ac9db 90 }
c66ac9db
NB		 91 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration),
93 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 94 if (!t10_pr_reg_cache) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 96 " failed\n");
35e0e757 97 goto out_free_ua_cache;
c66ac9db
NB		 98 }
99 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
101 0, NULL);
6708bb27
AG		 102 if (!t10_alua_lu_gp_cache) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 104 " failed\n");
35e0e757 105 goto out_free_pr_reg_cache;
c66ac9db
NB		 106 }
107 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member),
109 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 110 if (!t10_alua_lu_gp_mem_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 112 "cache failed\n");
35e0e757 113 goto out_free_lu_gp_cache;
c66ac9db
NB		 114 }
115 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp),
117 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 118 if (!t10_alua_tg_pt_gp_cache) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 120 "cache failed\n");
35e0e757 121 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 122 }
123 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member),
126 __alignof__(struct t10_alua_tg_pt_gp_member),
127 0, NULL);
6708bb27
AG		 128 if (!t10_alua_tg_pt_gp_mem_cache) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 130 "mem_t failed\n");
35e0e757 131 goto out_free_tg_pt_gp_cache;
c66ac9db 132 }
229d4f11
HR		 133 t10_alua_lba_map_cache = kmem_cache_create(
134 "t10_alua_lba_map_cache",
135 sizeof(struct t10_alua_lba_map),
136 __alignof__(struct t10_alua_lba_map), 0, NULL);
137 if (!t10_alua_lba_map_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lba_map_"
139 "cache failed\n");
140 goto out_free_tg_pt_gp_mem_cache;
141 }
142 t10_alua_lba_map_mem_cache = kmem_cache_create(
143 "t10_alua_lba_map_mem_cache",
144 sizeof(struct t10_alua_lba_map_member),
145 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
146 if (!t10_alua_lba_map_mem_cache) {
147 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
148 "cache failed\n");
149 goto out_free_lba_map_cache;
150 }
c66ac9db 151
35e0e757
CH		 152 target_completion_wq = alloc_workqueue("target_completion",
153 WQ_MEM_RECLAIM, 0);
154 if (!target_completion_wq)
229d4f11 155 goto out_free_lba_map_mem_cache;
35e0e757 156
c66ac9db 157 return 0;
35e0e757 158
229d4f11
HR		 159out_free_lba_map_mem_cache:
160 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
161out_free_lba_map_cache:
162 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 163out_free_tg_pt_gp_mem_cache:
164 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
165out_free_tg_pt_gp_cache:
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167out_free_lu_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
169out_free_lu_gp_cache:
170 kmem_cache_destroy(t10_alua_lu_gp_cache);
171out_free_pr_reg_cache:
172 kmem_cache_destroy(t10_pr_reg_cache);
173out_free_ua_cache:
174 kmem_cache_destroy(se_ua_cache);
175out_free_sess_cache:
176 kmem_cache_destroy(se_sess_cache);
c66ac9db 177out:
e3d6f909 178 return -ENOMEM;
c66ac9db
NB		 179}
180
e3d6f909 181void release_se_kmem_caches(void)
c66ac9db 182{
35e0e757 183 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 184 kmem_cache_destroy(se_sess_cache);
185 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 186 kmem_cache_destroy(t10_pr_reg_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_cache);
188 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
229d4f11
HR		 191 kmem_cache_destroy(t10_alua_lba_map_cache);
192 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 193}
194
e3d6f909
AG		 195/* This code ensures unique mib indexes are handed out. */
196static DEFINE_SPINLOCK(scsi_mib_index_lock);
197static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 198
199/*
200 * Allocate a new row index for the entry type specified
201 */
202u32 scsi_get_new_index(scsi_index_t type)
203{
204 u32 new_index;
205
e3d6f909 206 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 207
e3d6f909
AG		 208 spin_lock(&scsi_mib_index_lock);
209 new_index = ++scsi_mib_index[type];
210 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 211
212 return new_index;
213}
214
dbc5623e 215void transport_subsystem_check_init(void)
c66ac9db
NB		 216{
217 int ret;
283669d2 218 static int sub_api_initialized;
c66ac9db 219
dbc5623e
NB		 220 if (sub_api_initialized)
221 return;
222
c66ac9db
NB		 223 ret = request_module("target_core_iblock");
224 if (ret != 0)
6708bb27 225 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 226
227 ret = request_module("target_core_file");
228 if (ret != 0)
6708bb27 229 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 230
231 ret = request_module("target_core_pscsi");
232 if (ret != 0)
6708bb27 233 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 234
7c9e7a6f
AG		 235 ret = request_module("target_core_user");
236 if (ret != 0)
237 pr_err("Unable to load target_core_user\n");
238
e3d6f909 239 sub_api_initialized = 1;
c66ac9db
NB		 240}
241
e70beee7 242struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 243{
244 struct se_session *se_sess;
245
246 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 247 if (!se_sess) {
248 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 249 " se_sess_cache\n");
250 return ERR_PTR(-ENOMEM);
251 }
252 INIT_LIST_HEAD(&se_sess->sess_list);
253 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 254 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 255 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 256 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 257 kref_init(&se_sess->sess_kref);
e70beee7 258 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 259
260 return se_sess;
261}
262EXPORT_SYMBOL(transport_init_session);
263
c0add7fd
NB		 264int transport_alloc_session_tags(struct se_session *se_sess,
265 unsigned int tag_num, unsigned int tag_size)
266{
267 int rc;
268
8c7f6e9b
NB		 269 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
270 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 271 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 272 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
273 if (!se_sess->sess_cmd_map) {
274 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
275 return -ENOMEM;
276 }
c0add7fd
NB		 277 }
278
279 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
280 if (rc < 0) {
281 pr_err("Unable to init se_sess->sess_tag_pool,"
282 " tag_num: %u\n", tag_num);
8c7f6e9b
NB		 283 if (is_vmalloc_addr(se_sess->sess_cmd_map))
284 vfree(se_sess->sess_cmd_map);
285 else
286 kfree(se_sess->sess_cmd_map);
c0add7fd
NB		 287 se_sess->sess_cmd_map = NULL;
288 return -ENOMEM;
289 }
290
291 return 0;
292}
293EXPORT_SYMBOL(transport_alloc_session_tags);
294
295struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 296 unsigned int tag_size,
297 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 298{
299 struct se_session *se_sess;
300 int rc;
301
e70beee7 302 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 303 if (IS_ERR(se_sess))
304 return se_sess;
305
306 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
307 if (rc < 0) {
308 transport_free_session(se_sess);
309 return ERR_PTR(-ENOMEM);
310 }
311
312 return se_sess;
313}
314EXPORT_SYMBOL(transport_init_session_tags);
315
c66ac9db 316/*
140854cb 317 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 318 */
319void __transport_register_session(
320 struct se_portal_group *se_tpg,
321 struct se_node_acl *se_nacl,
322 struct se_session *se_sess,
323 void *fabric_sess_ptr)
324{
325 unsigned char buf[PR_REG_ISID_LEN];
326
327 se_sess->se_tpg = se_tpg;
328 se_sess->fabric_sess_ptr = fabric_sess_ptr;
329 /*
330 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
331 *
332 * Only set for struct se_session's that will actually be moving I/O.
333 * eg: *NOT* discovery sessions.
334 */
335 if (se_nacl) {
336 /*
337 * If the fabric module supports an ISID based TransportID,
338 * save this value in binary from the fabric I_T Nexus now.
339 */
e3d6f909 340 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 341 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 342 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 343 &buf[0], PR_REG_ISID_LEN);
344 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
345 }
afb999ff
NB		 346 kref_get(&se_nacl->acl_kref);
347
c66ac9db
NB		 348 spin_lock_irq(&se_nacl->nacl_sess_lock);
349 /*
350 * The se_nacl->nacl_sess pointer will be set to the
351 * last active I_T Nexus for each struct se_node_acl.
352 */
353 se_nacl->nacl_sess = se_sess;
354
355 list_add_tail(&se_sess->sess_acl_list,
356 &se_nacl->acl_sess_list);
357 spin_unlock_irq(&se_nacl->nacl_sess_lock);
358 }
359 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
360
6708bb27 361 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 362 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 363}
364EXPORT_SYMBOL(__transport_register_session);
365
366void transport_register_session(
367 struct se_portal_group *se_tpg,
368 struct se_node_acl *se_nacl,
369 struct se_session *se_sess,
370 void *fabric_sess_ptr)
371{
140854cb
NB		 372 unsigned long flags;
373
374 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 375 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 376 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 377}
378EXPORT_SYMBOL(transport_register_session);
379
ecf0dd66 380static void target_release_session(struct kref *kref)
41ac82b6
NB		 381{
382 struct se_session *se_sess = container_of(kref,
383 struct se_session, sess_kref);
384 struct se_portal_group *se_tpg = se_sess->se_tpg;
385
386 se_tpg->se_tpg_tfo->close_session(se_sess);
387}
388
389void target_get_session(struct se_session *se_sess)
390{
391 kref_get(&se_sess->sess_kref);
392}
393EXPORT_SYMBOL(target_get_session);
394
33933a0e 395void target_put_session(struct se_session *se_sess)
41ac82b6 396{
4149268e
JE		 397 struct se_portal_group *tpg = se_sess->se_tpg;
398
399 if (tpg->se_tpg_tfo->put_session != NULL) {
400 tpg->se_tpg_tfo->put_session(se_sess);
401 return;
402 }
33933a0e 403 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 404}
405EXPORT_SYMBOL(target_put_session);
406
f8e471f9
NB		 407ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
408{
409 struct se_session *se_sess;
410 ssize_t len = 0;
411
412 spin_lock_bh(&se_tpg->session_lock);
413 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
414 if (!se_sess->se_node_acl)
415 continue;
416 if (!se_sess->se_node_acl->dynamic_node_acl)
417 continue;
418 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
419 break;
420
421 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
422 se_sess->se_node_acl->initiatorname);
423 len += 1; /* Include NULL terminator */
424 }
425 spin_unlock_bh(&se_tpg->session_lock);
426
427 return len;
428}
429EXPORT_SYMBOL(target_show_dynamic_sessions);
430
afb999ff
NB		 431static void target_complete_nacl(struct kref *kref)
432{
433 struct se_node_acl *nacl = container_of(kref,
434 struct se_node_acl, acl_kref);
435
436 complete(&nacl->acl_free_comp);
437}
438
439void target_put_nacl(struct se_node_acl *nacl)
440{
441 kref_put(&nacl->acl_kref, target_complete_nacl);
442}
443
c66ac9db
NB		 444void transport_deregister_session_configfs(struct se_session *se_sess)
445{
446 struct se_node_acl *se_nacl;
23388864 447 unsigned long flags;
c66ac9db
NB		 448 /*
449 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
450 */
451 se_nacl = se_sess->se_node_acl;
6708bb27 452 if (se_nacl) {
23388864 453 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 454 if (se_nacl->acl_stop == 0)
455 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 456 /*
457 * If the session list is empty, then clear the pointer.
458 * Otherwise, set the struct se_session pointer from the tail
459 * element of the per struct se_node_acl active session list.
460 */
461 if (list_empty(&se_nacl->acl_sess_list))
462 se_nacl->nacl_sess = NULL;
463 else {
464 se_nacl->nacl_sess = container_of(
465 se_nacl->acl_sess_list.prev,
466 struct se_session, sess_acl_list);
467 }
23388864 468 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 469 }
470}
471EXPORT_SYMBOL(transport_deregister_session_configfs);
472
473void transport_free_session(struct se_session *se_sess)
474{
c0add7fd
NB		 475 if (se_sess->sess_cmd_map) {
476 percpu_ida_destroy(&se_sess->sess_tag_pool);
8c7f6e9b
NB		 477 if (is_vmalloc_addr(se_sess->sess_cmd_map))
478 vfree(se_sess->sess_cmd_map);
479 else
480 kfree(se_sess->sess_cmd_map);
c0add7fd 481 }
c66ac9db
NB		 482 kmem_cache_free(se_sess_cache, se_sess);
483}
484EXPORT_SYMBOL(transport_free_session);
485
486void transport_deregister_session(struct se_session *se_sess)
487{
488 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 489 struct target_core_fabric_ops *se_tfo;
c66ac9db 490 struct se_node_acl *se_nacl;
e63a8e19 491 unsigned long flags;
01468346 492 bool comp_nacl = true;
c66ac9db 493
6708bb27 494 if (!se_tpg) {
c66ac9db
NB		 495 transport_free_session(se_sess);
496 return;
497 }
01468346 498 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 499
e63a8e19 500 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 501 list_del(&se_sess->sess_list);
502 se_sess->se_tpg = NULL;
503 se_sess->fabric_sess_ptr = NULL;
e63a8e19 504 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 505
506 /*
507 * Determine if we need to do extra work for this initiator node's
508 * struct se_node_acl if it had been previously dynamically generated.
509 */
510 se_nacl = se_sess->se_node_acl;
01468346
NB		 511
512 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
513 if (se_nacl && se_nacl->dynamic_node_acl) {
514 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
515 list_del(&se_nacl->acl_list);
516 se_tpg->num_node_acls--;
517 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
518 core_tpg_wait_for_nacl_pr_ref(se_nacl);
519 core_free_device_list_for_node(se_nacl, se_tpg);
520 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
521
522 comp_nacl = false;
523 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 524 }
c66ac9db 525 }
01468346 526 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 527
6708bb27 528 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 529 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 530 /*
125d0119 531 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 532 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
533 * removal context.
01468346 534 */
0bcc297e 535 if (se_nacl && comp_nacl)
afb999ff 536 target_put_nacl(se_nacl);
01468346 537
afb999ff 538 transport_free_session(se_sess);
c66ac9db
NB		 539}
540EXPORT_SYMBOL(transport_deregister_session);
541
542/*
a1d8b49a 543 * Called with cmd->t_state_lock held.
c66ac9db 544 */
cf572a96 545static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 546{
42bf829e 547 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 548 unsigned long flags;
549
42bf829e
CH		 550 if (!dev)
551 return;
c66ac9db 552
cf572a96
CH		 553 if (cmd->transport_state & CMD_T_BUSY)
554 return;
c66ac9db 555
cf572a96
CH		 556 spin_lock_irqsave(&dev->execute_task_lock, flags);
557 if (cmd->state_active) {
558 list_del(&cmd->state_list);
cf572a96 559 cmd->state_active = false;
c66ac9db 560 }
cf572a96 561 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 562}
563
862e6389
NB		 564static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
565 bool write_pending)
c66ac9db
NB		 566{
567 unsigned long flags;
568
a1d8b49a 569 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 570 if (write_pending)
571 cmd->t_state = TRANSPORT_WRITE_PENDING;
572
f7113a47
CH		 573 if (remove_from_lists) {
574 target_remove_from_state_list(cmd);
575
576 /*
577 * Clear struct se_cmd->se_lun before the handoff to FE.
578 */
579 cmd->se_lun = NULL;
580 }
581
c66ac9db
NB		 582 /*
583 * Determine if frontend context caller is requesting the stopping of
e3d6f909 584 * this command for frontend exceptions.
c66ac9db 585 */
7d680f3b
CH		 586 if (cmd->transport_state & CMD_T_STOP) {
587 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
588 __func__, __LINE__,
e3d6f909 589 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 590
a1d8b49a 591 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 592
a95d6511 593 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 594 return 1;
595 }
f7113a47
CH		 596
597 cmd->transport_state &= ~CMD_T_ACTIVE;
598 if (remove_from_lists) {
599 /*
600 * Some fabric modules like tcm_loop can release
601 * their internally allocated I/O reference now and
602 * struct se_cmd now.
603 *
604 * Fabric modules are expected to return '1' here if the
605 * se_cmd being passed is released at this point,
606 * or zero if not being released.
607 */
608 if (cmd->se_tfo->check_stop_free != NULL) {
609 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
610 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 611 }
f7113a47 612 }
c66ac9db 613
a1d8b49a 614 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 615 return 0;
616}
617
618static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
619{
862e6389 620 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 621}
622
623static void transport_lun_remove_cmd(struct se_cmd *cmd)
624{
e3d6f909 625 struct se_lun *lun = cmd->se_lun;
c66ac9db 626
5259a06e 627 if (!lun)
c66ac9db
NB		 628 return;
629
5259a06e
NB		 630 if (cmpxchg(&cmd->lun_ref_active, true, false))
631 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 632}
633
634void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
635{
68259b5a
AL		 636 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
637 transport_lun_remove_cmd(cmd);
131e6abc
NB		 638 /*
639 * Allow the fabric driver to unmap any resources before
640 * releasing the descriptor via TFO->release_cmd()
641 */
642 if (remove)
643 cmd->se_tfo->aborted_task(cmd);
68259b5a 644
c66ac9db
NB		 645 if (transport_cmd_check_stop_to_fabric(cmd))
646 return;
af877292 647 if (remove)
e6a2573f 648 transport_put_cmd(cmd);
c66ac9db
NB		 649}
650
35e0e757
CH		 651static void target_complete_failure_work(struct work_struct *work)
652{
653 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
654
de103c93
CH		 655 transport_generic_request_failure(cmd,
656 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 657}
658
6138ed2a 659/*
d5829eac
PB		 660 * Used when asking transport to copy Sense Data from the underlying
661 * Linux/SCSI struct scsi_cmnd
6138ed2a 662 */
d5829eac 663static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 664{
6138ed2a 665 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 666
667 WARN_ON(!cmd->se_lun);
668
669 if (!dev)
d5829eac 670 return NULL;
6138ed2a 671
d5829eac
PB		 672 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
673 return NULL;
6138ed2a 674
9c58b7dd 675 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 676
d5829eac 677 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 678 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 679 return cmd->sense_buffer;
6138ed2a
PB		 680}
681
5787cacd 682void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 683{
42bf829e 684 struct se_device *dev = cmd->se_dev;
5787cacd 685 int success = scsi_status == GOOD;
c66ac9db 686 unsigned long flags;
c66ac9db 687
5787cacd
CH		 688 cmd->scsi_status = scsi_status;
689
690
a1d8b49a 691 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 692 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 693
c66ac9db 694 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 695 dev->transport->transport_complete(cmd,
696 cmd->t_data_sg,
697 transport_get_sense_buffer(cmd));
698 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 699 success = 1;
c66ac9db
NB		 700 }
701
702 /*
5787cacd 703 * See if we are waiting to complete for an exception condition.
c66ac9db 704 */
cf572a96 705 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 706 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 707 complete(&cmd->task_stop_comp);
c66ac9db
NB		 708 return;
709 }
2235007c 710
3d28934a 711 /*
125d0119 712 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 713 * and transport_wait_for_tasks() will be waiting for completion..
714 */
715 if (cmd->transport_state & CMD_T_ABORTED &&
716 cmd->transport_state & CMD_T_STOP) {
717 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 718 complete_all(&cmd->t_transport_stop_comp);
3d28934a 719 return;
3dca1471 720 } else if (!success) {
35e0e757 721 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 722 } else {
35e0e757 723 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 724 }
35e0e757 725
35e0e757 726 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 727 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 728 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 729
35e0e757 730 queue_work(target_completion_wq, &cmd->work);
c66ac9db 731}
6bb35e00
CH		 732EXPORT_SYMBOL(target_complete_cmd);
733
2426bd45
RD		 734void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
735{
736 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
737 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
738 cmd->residual_count += cmd->data_length - length;
739 } else {
740 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
741 cmd->residual_count = cmd->data_length - length;
742 }
743
744 cmd->data_length = length;
745 }
746
747 target_complete_cmd(cmd, scsi_status);
748}
749EXPORT_SYMBOL(target_complete_cmd_with_length);
750
cf572a96 751static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 752{
cf572a96
CH		 753 struct se_device *dev = cmd->se_dev;
754 unsigned long flags;
c66ac9db 755
cf572a96
CH		 756 spin_lock_irqsave(&dev->execute_task_lock, flags);
757 if (!cmd->state_active) {
758 list_add_tail(&cmd->state_list, &dev->state_list);
759 cmd->state_active = true;
c66ac9db 760 }
cf572a96 761 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 762}
763
07bde79a 764/*
f147abb4 765 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 766 */
7a6f0a1e
CH		 767static void transport_write_pending_qf(struct se_cmd *cmd);
768static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 769
0fd97ccf 770void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 771{
772 struct se_device *dev = container_of(work, struct se_device,
773 qf_work_queue);
bcac364a 774 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 775 struct se_cmd *cmd, *cmd_tmp;
776
777 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 778 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
779 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 780
bcac364a 781 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 782 list_del(&cmd->se_qf_node);
33940d09 783 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 784
6708bb27 785 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 786 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 787 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 788 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
789 : "UNKNOWN");
f7a5cc0b 790
7a6f0a1e
CH		 791 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
792 transport_write_pending_qf(cmd);
793 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
794 transport_complete_qf(cmd);
07bde79a 795 }
07bde79a
NB		 796}
797
c66ac9db
NB		 798unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
799{
800 switch (cmd->data_direction) {
801 case DMA_NONE:
802 return "NONE";
803 case DMA_FROM_DEVICE:
804 return "READ";
805 case DMA_TO_DEVICE:
806 return "WRITE";
807 case DMA_BIDIRECTIONAL:
808 return "BIDI";
809 default:
810 break;
811 }
812
813 return "UNKNOWN";
814}
815
816void transport_dump_dev_state(
817 struct se_device *dev,
818 char *b,
819 int *bl)
820{
821 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 822 if (dev->export_count)
c66ac9db 823 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 824 else
c66ac9db 825 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 826
5f41a31d 827 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 828 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 829 dev->dev_attrib.block_size,
830 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 831 *bl += sprintf(b + *bl, " ");
832}
833
c66ac9db
NB		 834void transport_dump_vpd_proto_id(
835 struct t10_vpd *vpd,
836 unsigned char *p_buf,
837 int p_buf_len)
838{
839 unsigned char buf[VPD_TMP_BUF_SIZE];
840 int len;
841
842 memset(buf, 0, VPD_TMP_BUF_SIZE);
843 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
844
845 switch (vpd->protocol_identifier) {
846 case 0x00:
847 sprintf(buf+len, "Fibre Channel\n");
848 break;
849 case 0x10:
850 sprintf(buf+len, "Parallel SCSI\n");
851 break;
852 case 0x20:
853 sprintf(buf+len, "SSA\n");
854 break;
855 case 0x30:
856 sprintf(buf+len, "IEEE 1394\n");
857 break;
858 case 0x40:
859 sprintf(buf+len, "SCSI Remote Direct Memory Access"
860 " Protocol\n");
861 break;
862 case 0x50:
863 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
864 break;
865 case 0x60:
866 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
867 break;
868 case 0x70:
869 sprintf(buf+len, "Automation/Drive Interface Transport"
870 " Protocol\n");
871 break;
872 case 0x80:
873 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
874 break;
875 default:
876 sprintf(buf+len, "Unknown 0x%02x\n",
877 vpd->protocol_identifier);
878 break;
879 }
880
881 if (p_buf)
882 strncpy(p_buf, buf, p_buf_len);
883 else
6708bb27 884 pr_debug("%s", buf);
c66ac9db
NB		 885}
886
887void
888transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
889{
890 /*
891 * Check if the Protocol Identifier Valid (PIV) bit is set..
892 *
893 * from spc3r23.pdf section 7.5.1
894 */
895 if (page_83[1] & 0x80) {
896 vpd->protocol_identifier = (page_83[0] & 0xf0);
897 vpd->protocol_identifier_set = 1;
898 transport_dump_vpd_proto_id(vpd, NULL, 0);
899 }
900}
901EXPORT_SYMBOL(transport_set_vpd_proto_id);
902
903int transport_dump_vpd_assoc(
904 struct t10_vpd *vpd,
905 unsigned char *p_buf,
906 int p_buf_len)
907{
908 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 909 int ret = 0;
910 int len;
c66ac9db
NB		 911
912 memset(buf, 0, VPD_TMP_BUF_SIZE);
913 len = sprintf(buf, "T10 VPD Identifier Association: ");
914
915 switch (vpd->association) {
916 case 0x00:
917 sprintf(buf+len, "addressed logical unit\n");
918 break;
919 case 0x10:
920 sprintf(buf+len, "target port\n");
921 break;
922 case 0x20:
923 sprintf(buf+len, "SCSI target device\n");
924 break;
925 default:
926 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 927 ret = -EINVAL;
c66ac9db
NB		 928 break;
929 }
930
931 if (p_buf)
932 strncpy(p_buf, buf, p_buf_len);
933 else
6708bb27 934 pr_debug("%s", buf);
c66ac9db
NB		 935
936 return ret;
937}
938
939int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
940{
941 /*
942 * The VPD identification association..
943 *
944 * from spc3r23.pdf Section 7.6.3.1 Table 297
945 */
946 vpd->association = (page_83[1] & 0x30);
947 return transport_dump_vpd_assoc(vpd, NULL, 0);
948}
949EXPORT_SYMBOL(transport_set_vpd_assoc);
950
951int transport_dump_vpd_ident_type(
952 struct t10_vpd *vpd,
953 unsigned char *p_buf,
954 int p_buf_len)
955{
956 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 957 int ret = 0;
958 int len;
c66ac9db
NB		 959
960 memset(buf, 0, VPD_TMP_BUF_SIZE);
961 len = sprintf(buf, "T10 VPD Identifier Type: ");
962
963 switch (vpd->device_identifier_type) {
964 case 0x00:
965 sprintf(buf+len, "Vendor specific\n");
966 break;
967 case 0x01:
968 sprintf(buf+len, "T10 Vendor ID based\n");
969 break;
970 case 0x02:
971 sprintf(buf+len, "EUI-64 based\n");
972 break;
973 case 0x03:
974 sprintf(buf+len, "NAA\n");
975 break;
976 case 0x04:
977 sprintf(buf+len, "Relative target port identifier\n");
978 break;
979 case 0x08:
980 sprintf(buf+len, "SCSI name string\n");
981 break;
982 default:
983 sprintf(buf+len, "Unsupported: 0x%02x\n",
984 vpd->device_identifier_type);
e3d6f909 985 ret = -EINVAL;
c66ac9db
NB		 986 break;
987 }
988
e3d6f909
AG		 989 if (p_buf) {
990 if (p_buf_len < strlen(buf)+1)
991 return -EINVAL;
c66ac9db 992 strncpy(p_buf, buf, p_buf_len);
e3d6f909 993 } else {
6708bb27 994 pr_debug("%s", buf);
e3d6f909 995 }
c66ac9db
NB		 996
997 return ret;
998}
999
1000int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1001{
1002 /*
1003 * The VPD identifier type..
1004 *
1005 * from spc3r23.pdf Section 7.6.3.1 Table 298
1006 */
1007 vpd->device_identifier_type = (page_83[1] & 0x0f);
1008 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1009}
1010EXPORT_SYMBOL(transport_set_vpd_ident_type);
1011
1012int transport_dump_vpd_ident(
1013 struct t10_vpd *vpd,
1014 unsigned char *p_buf,
1015 int p_buf_len)
1016{
1017 unsigned char buf[VPD_TMP_BUF_SIZE];
1018 int ret = 0;
1019
1020 memset(buf, 0, VPD_TMP_BUF_SIZE);
1021
1022 switch (vpd->device_identifier_code_set) {
1023 case 0x01: /* Binary */
703d641d
DC		 1024 snprintf(buf, sizeof(buf),
1025 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1026 &vpd->device_identifier[0]);
1027 break;
1028 case 0x02: /* ASCII */
703d641d
DC		 1029 snprintf(buf, sizeof(buf),
1030 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1031 &vpd->device_identifier[0]);
1032 break;
1033 case 0x03: /* UTF-8 */
703d641d
DC		 1034 snprintf(buf, sizeof(buf),
1035 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1036 &vpd->device_identifier[0]);
1037 break;
1038 default:
1039 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1040 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1041 ret = -EINVAL;
c66ac9db
NB		 1042 break;
1043 }
1044
1045 if (p_buf)
1046 strncpy(p_buf, buf, p_buf_len);
1047 else
6708bb27 1048 pr_debug("%s", buf);
c66ac9db
NB		 1049
1050 return ret;
1051}
1052
1053int
1054transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1055{
1056 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1057 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1058
1059 /*
1060 * The VPD Code Set (encoding)
1061 *
1062 * from spc3r23.pdf Section 7.6.3.1 Table 296
1063 */
1064 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1065 switch (vpd->device_identifier_code_set) {
1066 case 0x01: /* Binary */
1067 vpd->device_identifier[j++] =
1068 hex_str[vpd->device_identifier_type];
1069 while (i < (4 + page_83[3])) {
1070 vpd->device_identifier[j++] =
1071 hex_str[(page_83[i] & 0xf0) >> 4];
1072 vpd->device_identifier[j++] =
1073 hex_str[page_83[i] & 0x0f];
1074 i++;
1075 }
1076 break;
1077 case 0x02: /* ASCII */
1078 case 0x03: /* UTF-8 */
1079 while (i < (4 + page_83[3]))
1080 vpd->device_identifier[j++] = page_83[i++];
1081 break;
1082 default:
1083 break;
1084 }
1085
1086 return transport_dump_vpd_ident(vpd, NULL, 0);
1087}
1088EXPORT_SYMBOL(transport_set_vpd_ident);
1089
de103c93
CH		 1090sense_reason_t
1091target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1092{
1093 struct se_device *dev = cmd->se_dev;
1094
1095 if (cmd->unknown_data_length) {
1096 cmd->data_length = size;
1097 } else if (size != cmd->data_length) {
1098 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1099 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1100 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1101 cmd->data_length, size, cmd->t_task_cdb[0]);
1102
9b3b8041
CH		 1103 if (cmd->data_direction == DMA_TO_DEVICE) {
1104 pr_err("Rejecting underflow/overflow"
1105 " WRITE data\n");
de103c93 1106 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1107 }
1108 /*
1109 * Reject READ_* or WRITE_* with overflow/underflow for
1110 * type SCF_SCSI_DATA_CDB.
1111 */
0fd97ccf 1112 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1113 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1114 " CDB on non 512-byte sector setup subsystem"
1115 " plugin: %s\n", dev->transport->name);
1116 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1117 return TCM_INVALID_CDB_FIELD;
9b3b8041 1118 }
4c054ba6
NB		 1119 /*
1120 * For the overflow case keep the existing fabric provided
1121 * ->data_length. Otherwise for the underflow case, reset
1122 * ->data_length to the smaller SCSI expected data transfer
1123 * length.
1124 */
9b3b8041
CH		 1125 if (size > cmd->data_length) {
1126 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1127 cmd->residual_count = (size - cmd->data_length);
1128 } else {
1129 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1130 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1131 cmd->data_length = size;
9b3b8041 1132 }
9b3b8041
CH		 1133 }
1134
1135 return 0;
1136
9b3b8041
CH		 1137}
1138
c66ac9db
NB		 1139/*
1140 * Used by fabric modules containing a local struct se_cmd within their
1141 * fabric dependent per I/O descriptor.
1142 */
1143void transport_init_se_cmd(
1144 struct se_cmd *cmd,
1145 struct target_core_fabric_ops *tfo,
1146 struct se_session *se_sess,
1147 u32 data_length,
1148 int data_direction,
1149 int task_attr,
1150 unsigned char *sense_buffer)
1151{
5951146d 1152 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1153 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1154 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1155 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1156 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1157 init_completion(&cmd->cmd_wait_comp);
cf572a96 1158 init_completion(&cmd->task_stop_comp);
a1d8b49a 1159 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1160 kref_init(&cmd->cmd_kref);
7d680f3b 1161 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1162
1163 cmd->se_tfo = tfo;
1164 cmd->se_sess = se_sess;
1165 cmd->data_length = data_length;
1166 cmd->data_direction = data_direction;
1167 cmd->sam_task_attr = task_attr;
1168 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1169
1170 cmd->state_active = false;
c66ac9db
NB		 1171}
1172EXPORT_SYMBOL(transport_init_se_cmd);
1173
de103c93
CH		 1174static sense_reason_t
1175transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1176{
019c4ca6
CH		 1177 struct se_device *dev = cmd->se_dev;
1178
c66ac9db
NB		 1179 /*
1180 * Check if SAM Task Attribute emulation is enabled for this
1181 * struct se_device storage object
1182 */
019c4ca6 1183 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1184 return 0;
1185
68d81f40 1186 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1187 pr_debug("SAM Task Attribute ACA"
c66ac9db 1188 " emulation is not supported\n");
de103c93 1189 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1190 }
1191 /*
1192 * Used to determine when ORDERED commands should go from
1193 * Dormant to Active status.
1194 */
019c4ca6 1195 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
6708bb27 1196 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1197 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1198 dev->transport->name);
c66ac9db
NB		 1199 return 0;
1200}
1201
de103c93
CH		 1202sense_reason_t
1203target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1204{
0fd97ccf 1205 struct se_device *dev = cmd->se_dev;
de103c93 1206 sense_reason_t ret;
c66ac9db 1207
c66ac9db
NB		 1208 /*
1209 * Ensure that the received CDB is less than the max (252 + 8) bytes
1210 * for VARIABLE_LENGTH_CMD
1211 */
1212 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1213 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1214 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1215 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1216 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1217 }
1218 /*
1219 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1220 * allocate the additional extended CDB buffer now.. Otherwise
1221 * setup the pointer from __t_task_cdb to t_task_cdb.
1222 */
a1d8b49a
AG		 1223 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1224 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1225 GFP_KERNEL);
6708bb27
AG		 1226 if (!cmd->t_task_cdb) {
1227 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1228 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1229 scsi_command_size(cdb),
a1d8b49a 1230 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1231 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1232 }
1233 } else
a1d8b49a 1234 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1235 /*
a1d8b49a 1236 * Copy the original CDB into cmd->
c66ac9db 1237 */
a1d8b49a 1238 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1239
e5c0d6ad
RD		 1240 trace_target_sequencer_start(cmd);
1241
cb4f4d3c
CH		 1242 /*
1243 * Check for an existing UNIT ATTENTION condition
1244 */
de103c93
CH		 1245 ret = target_scsi3_ua_check(cmd);
1246 if (ret)
1247 return ret;
cb4f4d3c 1248
c87fbd56 1249 ret = target_alua_state_check(cmd);
de103c93
CH		 1250 if (ret)
1251 return ret;
cb4f4d3c 1252
d977f437 1253 ret = target_check_reservation(cmd);
f85eda8d
NB		 1254 if (ret) {
1255 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1256 return ret;
f85eda8d 1257 }
cb4f4d3c 1258
0fd97ccf 1259 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1260 if (ret)
1261 return ret;
1262
1263 ret = transport_check_alloc_task_attr(cmd);
1264 if (ret)
c66ac9db 1265 return ret;
cb4f4d3c 1266
cb4f4d3c 1267 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1268
c66ac9db
NB		 1269 spin_lock(&cmd->se_lun->lun_sep_lock);
1270 if (cmd->se_lun->lun_sep)
1271 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1272 spin_unlock(&cmd->se_lun->lun_sep_lock);
1273 return 0;
1274}
a12f41f8 1275EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1276
695434e1
NB		 1277/*
1278 * Used by fabric module frontends to queue tasks directly.
1279 * Many only be used from process context only
1280 */
1281int transport_handle_cdb_direct(
1282 struct se_cmd *cmd)
1283{
de103c93 1284 sense_reason_t ret;
dd8ae59d 1285
695434e1
NB		 1286 if (!cmd->se_lun) {
1287 dump_stack();
6708bb27 1288 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1289 return -EINVAL;
1290 }
1291 if (in_interrupt()) {
1292 dump_stack();
6708bb27 1293 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1294 " from interrupt context\n");
1295 return -EINVAL;
1296 }
dd8ae59d 1297 /*
af877292
CH		 1298 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1299 * outstanding descriptors are handled correctly during shutdown via
1300 * transport_wait_for_tasks()
dd8ae59d
NB		 1301 *
1302 * Also, we don't take cmd->t_state_lock here as we only expect
1303 * this to be called for initial descriptor submission.
1304 */
1305 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1306 cmd->transport_state |= CMD_T_ACTIVE;
1307
dd8ae59d
NB		 1308 /*
1309 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1310 * so follow TRANSPORT_NEW_CMD processing thread context usage
1311 * and call transport_generic_request_failure() if necessary..
1312 */
1313 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1314 if (ret)
1315 transport_generic_request_failure(cmd, ret);
dd8ae59d 1316 return 0;
695434e1
NB		 1317}
1318EXPORT_SYMBOL(transport_handle_cdb_direct);
1319
c5ff8d6b 1320sense_reason_t
de103c93
CH		 1321transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1322 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1323{
1324 if (!sgl || !sgl_count)
1325 return 0;
1326
1327 /*
1328 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1329 * scatterlists already have been set to follow what the fabric
1330 * passes for the original expected data transfer length.
1331 */
1332 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1333 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1334 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1335 return TCM_INVALID_CDB_FIELD;
1336 }
1337
1338 cmd->t_data_sg = sgl;
1339 cmd->t_data_nents = sgl_count;
1340
1341 if (sgl_bidi && sgl_bidi_count) {
1342 cmd->t_bidi_data_sg = sgl_bidi;
1343 cmd->t_bidi_data_nents = sgl_bidi_count;
1344 }
1345 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1346 return 0;
1347}
1348
a026757f
NB		 1349/*
1350 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1351 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1352 *
1353 * @se_cmd: command descriptor to submit
1354 * @se_sess: associated se_sess for endpoint
1355 * @cdb: pointer to SCSI CDB
1356 * @sense: pointer to SCSI sense buffer
1357 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1358 * @data_length: fabric expected data transfer length
1359 * @task_addr: SAM task attribute
1360 * @data_dir: DMA data direction
1361 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1362 * @sgl: struct scatterlist memory for unidirectional mapping
1363 * @sgl_count: scatterlist count for unidirectional mapping
1364 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1365 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1366 * @sgl_prot: struct scatterlist memory protection information
1367 * @sgl_prot_count: scatterlist count for protection information
a6360785 1368 *
d6dfc868
RD		 1369 * Returns non zero to signal active I/O shutdown failure. All other
1370 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1371 * but still return zero here.
1372 *
a6360785
NB		 1373 * This may only be called from process context, and also currently
1374 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1375 */
1376int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1377 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1378 u32 data_length, int task_attr, int data_dir, int flags,
1379 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1380 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1381 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1382{
1383 struct se_portal_group *se_tpg;
de103c93
CH		 1384 sense_reason_t rc;
1385 int ret;
a6360785
NB		 1386
1387 se_tpg = se_sess->se_tpg;
1388 BUG_ON(!se_tpg);
1389 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1390 BUG_ON(in_interrupt());
1391 /*
1392 * Initialize se_cmd for target operation. From this point
1393 * exceptions are handled by sending exception status via
1394 * target_core_fabric_ops->queue_status() callback
1395 */
1396 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1397 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1398 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1399 se_cmd->unknown_data_length = 1;
a6360785
NB		 1400 /*
1401 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1402 * se_sess->sess_cmd_list. A second kref_get here is necessary
1403 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1404 * kref_put() to happen during fabric packet acknowledgement.
1405 */
de103c93
CH		 1406 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1407 if (ret)
1408 return ret;
a6360785
NB		 1409 /*
1410 * Signal bidirectional data payloads to target-core
1411 */
1412 if (flags & TARGET_SCF_BIDI_OP)
1413 se_cmd->se_cmd_flags |= SCF_BIDI;
1414 /*
1415 * Locate se_lun pointer and attach it to struct se_cmd
1416 */
de103c93
CH		 1417 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1418 if (rc) {
1419 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1420 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1421 return 0;
735703ca 1422 }
b5b8e298
SG		 1423
1424 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1425 if (rc != 0) {
1426 transport_generic_request_failure(se_cmd, rc);
1427 return 0;
1428 }
1429
def2b339
NB		 1430 /*
1431 * Save pointers for SGLs containing protection information,
1432 * if present.
1433 */
1434 if (sgl_prot_count) {
1435 se_cmd->t_prot_sg = sgl_prot;
1436 se_cmd->t_prot_nents = sgl_prot_count;
1437 }
d6e0175c 1438
a026757f
NB		 1439 /*
1440 * When a non zero sgl_count has been passed perform SGL passthrough
1441 * mapping for pre-allocated fabric memory instead of having target
1442 * core perform an internal SGL allocation..
1443 */
1444 if (sgl_count != 0) {
1445 BUG_ON(!sgl);
1446
944981c7
NB		 1447 /*
1448 * A work-around for tcm_loop as some userspace code via
1449 * scsi-generic do not memset their associated read buffers,
1450 * so go ahead and do that here for type non-data CDBs. Also
1451 * note that this is currently guaranteed to be a single SGL
1452 * for this case by target core in target_setup_cmd_from_cdb()
1453 * -> transport_generic_cmd_sequencer().
1454 */
1455 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1456 se_cmd->data_direction == DMA_FROM_DEVICE) {
1457 unsigned char *buf = NULL;
1458
1459 if (sgl)
1460 buf = kmap(sg_page(sgl)) + sgl->offset;
1461
1462 if (buf) {
1463 memset(buf, 0, sgl->length);
1464 kunmap(sg_page(sgl));
1465 }
1466 }
1467
a026757f
NB		 1468 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1469 sgl_bidi, sgl_bidi_count);
1470 if (rc != 0) {
de103c93 1471 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1472 return 0;
1473 }
1474 }
def2b339 1475
11e319ed
AG		 1476 /*
1477 * Check if we need to delay processing because of ALUA
1478 * Active/NonOptimized primary access state..
1479 */
1480 core_alua_check_nonop_delay(se_cmd);
1481
a6360785 1482 transport_handle_cdb_direct(se_cmd);
d6dfc868 1483 return 0;
a6360785 1484}
a026757f
NB		 1485EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1486
1487/*
1488 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1489 *
1490 * @se_cmd: command descriptor to submit
1491 * @se_sess: associated se_sess for endpoint
1492 * @cdb: pointer to SCSI CDB
1493 * @sense: pointer to SCSI sense buffer
1494 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1495 * @data_length: fabric expected data transfer length
1496 * @task_addr: SAM task attribute
1497 * @data_dir: DMA data direction
1498 * @flags: flags for command submission from target_sc_flags_tables
1499 *
1500 * Returns non zero to signal active I/O shutdown failure. All other
1501 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1502 * but still return zero here.
1503 *
1504 * This may only be called from process context, and also currently
1505 * assumes internal allocation of fabric payload buffer by target-core.
1506 *
1507 * It also assumes interal target core SGL memory allocation.
1508 */
1509int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1510 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1511 u32 data_length, int task_attr, int data_dir, int flags)
1512{
1513 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1514 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1515 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1516}
a6360785
NB		 1517EXPORT_SYMBOL(target_submit_cmd);
1518
9f0d05c2
NB		 1519static void target_complete_tmr_failure(struct work_struct *work)
1520{
1521 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1522
1523 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1524 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1525
1526 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1527}
1528
ea98d7f9
AG		 1529/**
1530 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1531 * for TMR CDBs
1532 *
1533 * @se_cmd: command descriptor to submit
1534 * @se_sess: associated se_sess for endpoint
1535 * @sense: pointer to SCSI sense buffer
1536 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1537 * @fabric_context: fabric context for TMR req
1538 * @tm_type: Type of TM request
c0974f89
NB		 1539 * @gfp: gfp type for caller
1540 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1541 * @flags: submit cmd flags
ea98d7f9
AG		 1542 *
1543 * Callable from all contexts.
1544 **/
1545
c7042cae 1546int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1547 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1548 void *fabric_tmr_ptr, unsigned char tm_type,
1549 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1550{
1551 struct se_portal_group *se_tpg;
1552 int ret;
1553
1554 se_tpg = se_sess->se_tpg;
1555 BUG_ON(!se_tpg);
1556
1557 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1558 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1559 /*
1560 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1561 * allocation failure.
1562 */
c0974f89 1563 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1564 if (ret < 0)
1565 return -ENOMEM;
ea98d7f9 1566
c0974f89
NB		 1567 if (tm_type == TMR_ABORT_TASK)
1568 se_cmd->se_tmr_req->ref_task_tag = tag;
1569
ea98d7f9 1570 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1571 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1572 if (ret) {
1573 core_tmr_release_req(se_cmd->se_tmr_req);
1574 return ret;
1575 }
ea98d7f9 1576
ea98d7f9
AG		 1577 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1578 if (ret) {
9f0d05c2
NB		 1579 /*
1580 * For callback during failure handling, push this work off
1581 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1582 */
1583 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1584 schedule_work(&se_cmd->work);
c7042cae 1585 return 0;
ea98d7f9
AG		 1586 }
1587 transport_generic_handle_tmr(se_cmd);
c7042cae 1588 return 0;
ea98d7f9
AG		 1589}
1590EXPORT_SYMBOL(target_submit_tmr);
1591
cdbb70bb 1592/*
cf572a96 1593 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1594 * has completed.
1595 */
cf572a96 1596bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1597{
cdbb70bb
CH		 1598 bool was_active = false;
1599
cf572a96
CH		 1600 if (cmd->transport_state & CMD_T_BUSY) {
1601 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1602 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1603
cf572a96
CH		 1604 pr_debug("cmd %p waiting to complete\n", cmd);
1605 wait_for_completion(&cmd->task_stop_comp);
1606 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1607
1608 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1609 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1610 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1611 was_active = true;
1612 }
1613
cdbb70bb
CH		 1614 return was_active;
1615}
1616
c66ac9db
NB		 1617/*
1618 * Handle SAM-esque emulation for generic transport request failures.
1619 */
de103c93
CH		 1620void transport_generic_request_failure(struct se_cmd *cmd,
1621 sense_reason_t sense_reason)
c66ac9db 1622{
07bde79a
NB		 1623 int ret = 0;
1624
6708bb27 1625 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1626 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1627 cmd->t_task_cdb[0]);
de103c93 1628 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1629 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1630 cmd->t_state, sense_reason);
d43d6aea 1631 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1632 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1633 (cmd->transport_state & CMD_T_STOP) != 0,
1634 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1635
c66ac9db
NB		 1636 /*
1637 * For SAM Task Attribute emulation for failed struct se_cmd
1638 */
019c4ca6 1639 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1640 /*
1641 * Handle special case for COMPARE_AND_WRITE failure, where the
1642 * callback is expected to drop the per device ->caw_mutex.
1643 */
1644 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1645 cmd->transport_complete_callback)
1646 cmd->transport_complete_callback(cmd);
c66ac9db 1647
de103c93 1648 switch (sense_reason) {
03e98c9e
NB		 1649 case TCM_NON_EXISTENT_LUN:
1650 case TCM_UNSUPPORTED_SCSI_OPCODE:
1651 case TCM_INVALID_CDB_FIELD:
1652 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1653 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1654 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1655 case TCM_UNKNOWN_MODE_PAGE:
1656 case TCM_WRITE_PROTECTED:
e2397c70 1657 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1658 case TCM_CHECK_CONDITION_ABORT_CMD:
1659 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1660 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1661 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1662 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1663 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1664 break;
de103c93
CH		 1665 case TCM_OUT_OF_RESOURCES:
1666 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1667 break;
03e98c9e 1668 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1669 /*
1670 * No SENSE Data payload for this case, set SCSI Status
1671 * and queue the response to $FABRIC_MOD.
1672 *
1673 * Uses linux/include/scsi/scsi.h SAM status codes defs
1674 */
1675 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1676 /*
1677 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1678 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1679 * CONFLICT STATUS.
1680 *
1681 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1682 */
e3d6f909 1683 if (cmd->se_sess &&
0fd97ccf 1684 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1685 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1686 cmd->orig_fe_lun, 0x2C,
1687 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1688
e5c0d6ad
RD		 1689 trace_target_cmd_complete(cmd);
1690 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1691 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1692 goto queue_full;
c66ac9db 1693 goto check_stop;
c66ac9db 1694 default:
6708bb27 1695 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1696 cmd->t_task_cdb[0], sense_reason);
1697 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1698 break;
1699 }
f3146437 1700
de103c93 1701 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1702 if (ret == -EAGAIN || ret == -ENOMEM)
1703 goto queue_full;
07bde79a 1704
c66ac9db
NB		 1705check_stop:
1706 transport_lun_remove_cmd(cmd);
6708bb27 1707 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1708 ;
07bde79a
NB		 1709 return;
1710
1711queue_full:
e057f533
CH		 1712 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1713 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1714}
2fbff127 1715EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1716
76dde50e 1717void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1718{
de103c93 1719 sense_reason_t ret;
5f41a31d 1720
de103c93
CH		 1721 if (cmd->execute_cmd) {
1722 ret = cmd->execute_cmd(cmd);
1723 if (ret) {
1724 spin_lock_irq(&cmd->t_state_lock);
1725 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1726 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1727
de103c93
CH		 1728 transport_generic_request_failure(cmd, ret);
1729 }
5f41a31d
CH		 1730 }
1731}
1732
019c4ca6 1733static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1734{
1735 struct se_device *dev = cmd->se_dev;
1736
019c4ca6
CH		 1737 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1738 return false;
5f41a31d 1739
c66ac9db 1740 /*
25985edc 1741 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1742 * to allow the passed struct se_cmd list of tasks to the front of the list.
1743 */
5f41a31d 1744 switch (cmd->sam_task_attr) {
68d81f40 1745 case TCM_HEAD_TAG:
5f41a31d
CH		 1746 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1747 "se_ordered_id: %u\n",
1748 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1749 return false;
68d81f40 1750 case TCM_ORDERED_TAG:
33940d09 1751 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1752
5f41a31d
CH		 1753 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1754 " se_ordered_id: %u\n",
1755 cmd->t_task_cdb[0], cmd->se_ordered_id);
1756
c66ac9db 1757 /*
5f41a31d
CH		 1758 * Execute an ORDERED command if no other older commands
1759 * exist that need to be completed first.
c66ac9db 1760 */
5f41a31d 1761 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1762 return false;
5f41a31d
CH		 1763 break;
1764 default:
c66ac9db
NB		 1765 /*
1766 * For SIMPLE and UNTAGGED Task Attribute commands
1767 */
33940d09 1768 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1769 break;
c66ac9db 1770 }
5f41a31d 1771
019c4ca6
CH		 1772 if (atomic_read(&dev->dev_ordered_sync) == 0)
1773 return false;
c66ac9db 1774
019c4ca6
CH		 1775 spin_lock(&dev->delayed_cmd_lock);
1776 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1777 spin_unlock(&dev->delayed_cmd_lock);
1778
1779 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1780 " delayed CMD list, se_ordered_id: %u\n",
1781 cmd->t_task_cdb[0], cmd->sam_task_attr,
1782 cmd->se_ordered_id);
1783 return true;
1784}
1785
1786void target_execute_cmd(struct se_cmd *cmd)
1787{
1788 /*
1789 * If the received CDB has aleady been aborted stop processing it here.
1790 */
4a9a6c8d 1791 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1792 return;
c66ac9db 1793
019c4ca6
CH		 1794 /*
1795 * Determine if frontend context caller is requesting the stopping of
1796 * this command for frontend exceptions.
1797 */
4a9a6c8d 1798 spin_lock_irq(&cmd->t_state_lock);
019c4ca6
CH		 1799 if (cmd->transport_state & CMD_T_STOP) {
1800 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1801 __func__, __LINE__,
1802 cmd->se_tfo->get_task_tag(cmd));
1803
1804 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1805 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1806 return;
1807 }
1808
1809 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1810 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1811 spin_unlock_irq(&cmd->t_state_lock);
a84bf9ee
NB		 1812 /*
1813 * Perform WRITE_INSERT of PI using software emulation when backend
1814 * device has PI enabled, if the transport has not already generated
1815 * PI using hardware WRITE_INSERT offload.
1816 */
1817 if (cmd->prot_op == TARGET_PROT_DOUT_INSERT) {
1818 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1819 sbc_dif_generate(cmd);
1820 }
019c4ca6 1821
1a398b97
NB		 1822 if (target_handle_task_attr(cmd)) {
1823 spin_lock_irq(&cmd->t_state_lock);
1824 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1825 spin_unlock_irq(&cmd->t_state_lock);
1826 return;
1827 }
1828
1829 __target_execute_cmd(cmd);
c66ac9db 1830}
70baf0ab 1831EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1832
5f41a31d
CH		 1833/*
1834 * Process all commands up to the last received ORDERED task attribute which
1835 * requires another blocking boundary
1836 */
1837static void target_restart_delayed_cmds(struct se_device *dev)
1838{
1839 for (;;) {
1840 struct se_cmd *cmd;
1841
1842 spin_lock(&dev->delayed_cmd_lock);
1843 if (list_empty(&dev->delayed_cmd_list)) {
1844 spin_unlock(&dev->delayed_cmd_lock);
1845 break;
1846 }
1847
1848 cmd = list_entry(dev->delayed_cmd_list.next,
1849 struct se_cmd, se_delayed_node);
1850 list_del(&cmd->se_delayed_node);
1851 spin_unlock(&dev->delayed_cmd_lock);
1852
1853 __target_execute_cmd(cmd);
1854
68d81f40 1855 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1856 break;
1857 }
1858}
1859
c66ac9db 1860/*
35e0e757 1861 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1862 * and ordered cmds need to have their tasks added to the execution queue.
1863 */
1864static void transport_complete_task_attr(struct se_cmd *cmd)
1865{
5951146d 1866 struct se_device *dev = cmd->se_dev;
c66ac9db 1867
019c4ca6
CH		 1868 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1869 return;
1870
68d81f40 1871 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1872 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1873 dev->dev_cur_ordered_id++;
6708bb27 1874 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1875 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1876 cmd->se_ordered_id);
68d81f40 1877 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1878 dev->dev_cur_ordered_id++;
6708bb27 1879 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1880 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1881 cmd->se_ordered_id);
68d81f40 1882 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1883 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1884
1885 dev->dev_cur_ordered_id++;
6708bb27 1886 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1887 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1888 }
c66ac9db 1889
5f41a31d 1890 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1891}
1892
e057f533 1893static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1894{
1895 int ret = 0;
1896
019c4ca6 1897 transport_complete_task_attr(cmd);
e057f533
CH		 1898
1899 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1900 trace_target_cmd_complete(cmd);
e057f533 1901 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1902 goto out;
e057f533 1903 }
07bde79a
NB		 1904
1905 switch (cmd->data_direction) {
1906 case DMA_FROM_DEVICE:
e5c0d6ad 1907 trace_target_cmd_complete(cmd);
07bde79a
NB		 1908 ret = cmd->se_tfo->queue_data_in(cmd);
1909 break;
1910 case DMA_TO_DEVICE:
64577407 1911 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a
NB		 1912 ret = cmd->se_tfo->queue_data_in(cmd);
1913 if (ret < 0)
e057f533 1914 break;
07bde79a
NB		 1915 }
1916 /* Fall through for DMA_TO_DEVICE */
1917 case DMA_NONE:
e5c0d6ad 1918 trace_target_cmd_complete(cmd);
07bde79a
NB		 1919 ret = cmd->se_tfo->queue_status(cmd);
1920 break;
1921 default:
1922 break;
1923 }
1924
e057f533
CH		 1925out:
1926 if (ret < 0) {
1927 transport_handle_queue_full(cmd, cmd->se_dev);
1928 return;
1929 }
1930 transport_lun_remove_cmd(cmd);
1931 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1932}
1933
1934static void transport_handle_queue_full(
1935 struct se_cmd *cmd,
e057f533 1936 struct se_device *dev)
07bde79a
NB		 1937{
1938 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 1939 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 1940 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 1941 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1942
1943 schedule_work(&cmd->se_dev->qf_work_queue);
1944}
1945
bc005869
NB		 1946static bool target_check_read_strip(struct se_cmd *cmd)
1947{
1948 sense_reason_t rc;
1949
1950 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
1951 rc = sbc_dif_read_strip(cmd);
1952 if (rc) {
1953 cmd->pi_err = rc;
1954 return true;
1955 }
1956 }
1957
1958 return false;
1959}
1960
35e0e757 1961static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1962{
35e0e757 1963 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1964 int ret;
35e0e757 1965
c66ac9db
NB		 1966 /*
1967 * Check if we need to move delayed/dormant tasks from cmds on the
1968 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1969 * Attribute.
1970 */
019c4ca6
CH		 1971 transport_complete_task_attr(cmd);
1972
07bde79a
NB		 1973 /*
1974 * Check to schedule QUEUE_FULL work, or execute an existing
1975 * cmd->transport_qf_callback()
1976 */
1977 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1978 schedule_work(&cmd->se_dev->qf_work_queue);
1979
c66ac9db 1980 /*
d5829eac 1981 * Check if we need to send a sense buffer from
c66ac9db
NB		 1982 * the struct se_cmd in question.
1983 */
1984 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1985 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1986 ret = transport_send_check_condition_and_sense(
1987 cmd, 0, 1);
1988 if (ret == -EAGAIN || ret == -ENOMEM)
1989 goto queue_full;
1990
1991 transport_lun_remove_cmd(cmd);
1992 transport_cmd_check_stop_to_fabric(cmd);
1993 return;
c66ac9db
NB		 1994 }
1995 /*
25985edc 1996 * Check for a callback, used by amongst other things
a6b0133c 1997 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 1998 */
a6b0133c
NB		 1999 if (cmd->transport_complete_callback) {
2000 sense_reason_t rc;
2001
2002 rc = cmd->transport_complete_callback(cmd);
a2890087 2003 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
a6b0133c 2004 return;
a2890087
NB		 2005 } else if (rc) {
2006 ret = transport_send_check_condition_and_sense(cmd,
2007 rc, 0);
2008 if (ret == -EAGAIN || ret == -ENOMEM)
2009 goto queue_full;
a6b0133c 2010
a2890087
NB		 2011 transport_lun_remove_cmd(cmd);
2012 transport_cmd_check_stop_to_fabric(cmd);
2013 return;
2014 }
a6b0133c 2015 }
c66ac9db
NB		 2016
2017 switch (cmd->data_direction) {
2018 case DMA_FROM_DEVICE:
2019 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2020 if (cmd->se_lun->lun_sep) {
2021 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2022 cmd->data_length;
2023 }
2024 spin_unlock(&cmd->se_lun->lun_sep_lock);
bc005869
NB		 2025 /*
2026 * Perform READ_STRIP of PI using software emulation when
2027 * backend had PI enabled, if the transport will not be
2028 * performing hardware READ_STRIP offload.
2029 */
2030 if (cmd->prot_op == TARGET_PROT_DIN_STRIP &&
2031 target_check_read_strip(cmd)) {
2032 ret = transport_send_check_condition_and_sense(cmd,
2033 cmd->pi_err, 0);
2034 if (ret == -EAGAIN || ret == -ENOMEM)
2035 goto queue_full;
2036
2037 transport_lun_remove_cmd(cmd);
2038 transport_cmd_check_stop_to_fabric(cmd);
2039 return;
2040 }
c66ac9db 2041
e5c0d6ad 2042 trace_target_cmd_complete(cmd);
07bde79a 2043 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2044 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2045 goto queue_full;
c66ac9db
NB		 2046 break;
2047 case DMA_TO_DEVICE:
2048 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2049 if (cmd->se_lun->lun_sep) {
2050 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2051 cmd->data_length;
2052 }
2053 spin_unlock(&cmd->se_lun->lun_sep_lock);
2054 /*
2055 * Check if we need to send READ payload for BIDI-COMMAND
2056 */
64577407 2057 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 2058 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2059 if (cmd->se_lun->lun_sep) {
2060 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2061 cmd->data_length;
2062 }
2063 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2064 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2065 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2066 goto queue_full;
c66ac9db
NB		 2067 break;
2068 }
2069 /* Fall through for DMA_TO_DEVICE */
2070 case DMA_NONE:
e5c0d6ad 2071 trace_target_cmd_complete(cmd);
07bde79a 2072 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2073 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2074 goto queue_full;
c66ac9db
NB		 2075 break;
2076 default:
2077 break;
2078 }
2079
2080 transport_lun_remove_cmd(cmd);
2081 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2082 return;
2083
2084queue_full:
6708bb27 2085 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2086 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2087 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2088 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2089}
2090
6708bb27 2091static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2092{
ec98f782 2093 struct scatterlist *sg;
ec98f782 2094 int count;
c66ac9db 2095
6708bb27
AG		 2096 for_each_sg(sgl, sg, nents, count)
2097 __free_page(sg_page(sg));
c66ac9db 2098
6708bb27
AG		 2099 kfree(sgl);
2100}
c66ac9db 2101
47e459e6
NB		 2102static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2103{
2104 /*
2105 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2106 * emulation, and free + reset pointers if necessary..
2107 */
2108 if (!cmd->t_data_sg_orig)
2109 return;
2110
2111 kfree(cmd->t_data_sg);
2112 cmd->t_data_sg = cmd->t_data_sg_orig;
2113 cmd->t_data_sg_orig = NULL;
2114 cmd->t_data_nents = cmd->t_data_nents_orig;
2115 cmd->t_data_nents_orig = 0;
2116}
2117
6708bb27
AG		 2118static inline void transport_free_pages(struct se_cmd *cmd)
2119{
47e459e6
NB		 2120 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2121 transport_reset_sgl_orig(cmd);
6708bb27 2122 return;
47e459e6
NB		 2123 }
2124 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2125
2126 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2127 cmd->t_data_sg = NULL;
2128 cmd->t_data_nents = 0;
c66ac9db 2129
6708bb27 2130 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2131 cmd->t_bidi_data_sg = NULL;
2132 cmd->t_bidi_data_nents = 0;
acb2bde3
SG		 2133
2134 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2135 cmd->t_prot_sg = NULL;
2136 cmd->t_prot_nents = 0;
c66ac9db
NB		 2137}
2138
e26d99ae
CH		 2139/**
2140 * transport_release_cmd - free a command
2141 * @cmd: command to free
2142 *
2143 * This routine unconditionally frees a command, and reference counting
2144 * or list removal must be done in the caller.
2145 */
d5ddad41 2146static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2147{
2148 BUG_ON(!cmd->se_tfo);
2149
c8e31f26 2150 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2151 core_tmr_release_req(cmd->se_tmr_req);
2152 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2153 kfree(cmd->t_task_cdb);
2154 /*
7481deb4
NB		 2155 * If this cmd has been setup with target_get_sess_cmd(), drop
2156 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2157 */
ca24976a 2158 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2159}
2160
d3df7825
CH		 2161/**
2162 * transport_put_cmd - release a reference to a command
2163 * @cmd: command to release
2164 *
2165 * This routine releases our reference to the command and frees it if possible.
2166 */
d5ddad41 2167static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2168{
c66ac9db 2169 transport_free_pages(cmd);
d5ddad41 2170 return transport_release_cmd(cmd);
c66ac9db 2171}
c66ac9db 2172
4949314c 2173void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2174{
ec98f782 2175 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2176 struct page **pages;
2177 int i;
05d1c7c0
AG		 2178
2179 /*
ec98f782
AG		 2180 * We need to take into account a possible offset here for fabrics like
2181 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2182 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2183 */
4949314c
AG		 2184 if (!cmd->t_data_nents)
2185 return NULL;
3717ef0c
PB		 2186
2187 BUG_ON(!sg);
2188 if (cmd->t_data_nents == 1)
4949314c
AG		 2189 return kmap(sg_page(sg)) + sg->offset;
2190
2191 /* >1 page. use vmap */
2192 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2193 if (!pages)
4949314c
AG		 2194 return NULL;
2195
2196 /* convert sg[] to pages[] */
2197 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2198 pages[i] = sg_page(sg);
2199 }
2200
2201 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2202 kfree(pages);
de103c93 2203 if (!cmd->t_data_vmap)
4949314c
AG		 2204 return NULL;
2205
2206 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2207}
4949314c 2208EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2209
4949314c 2210void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2211{
a1edf9cf 2212 if (!cmd->t_data_nents) {
4949314c 2213 return;
a1edf9cf 2214 } else if (cmd->t_data_nents == 1) {
4949314c 2215 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2216 return;
2217 }
4949314c
AG		 2218
2219 vunmap(cmd->t_data_vmap);
2220 cmd->t_data_vmap = NULL;
05d1c7c0 2221}
4949314c 2222EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2223
c5ff8d6b 2224int
20093994
NB		 2225target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2226 bool zero_page)
c66ac9db 2227{
20093994 2228 struct scatterlist *sg;
ec98f782 2229 struct page *page;
20093994
NB		 2230 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2231 unsigned int nent;
ec98f782 2232 int i = 0;
c66ac9db 2233
20093994
NB		 2234 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2235 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2236 if (!sg)
ec98f782 2237 return -ENOMEM;
c66ac9db 2238
20093994 2239 sg_init_table(sg, nent);
9db9da33 2240
ec98f782
AG		 2241 while (length) {
2242 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2243 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2244 if (!page)
2245 goto out;
c66ac9db 2246
20093994 2247 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2248 length -= page_len;
2249 i++;
c66ac9db 2250 }
20093994
NB		 2251 *sgl = sg;
2252 *nents = nent;
c66ac9db 2253 return 0;
c66ac9db 2254
ec98f782 2255out:
d0e27c88 2256 while (i > 0) {
ec98f782 2257 i--;
20093994 2258 __free_page(sg_page(&sg[i]));
c66ac9db 2259 }
20093994 2260 kfree(sg);
ec98f782 2261 return -ENOMEM;
c66ac9db
NB		 2262}
2263
da0f7619 2264/*
b16a35b0
AG		 2265 * Allocate any required resources to execute the command. For writes we
2266 * might not have the payload yet, so notify the fabric via a call to
2267 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2268 */
de103c93
CH		 2269sense_reason_t
2270transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2271{
c66ac9db
NB		 2272 int ret = 0;
2273
2274 /*
2275 * Determine is the TCM fabric module has already allocated physical
2276 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2277 * beforehand.
c66ac9db 2278 */
ec98f782
AG		 2279 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2280 cmd->data_length) {
20093994
NB		 2281 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2282
8cefe07b
NB		 2283 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2284 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2285 u32 bidi_length;
2286
2287 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2288 bidi_length = cmd->t_task_nolb *
2289 cmd->se_dev->dev_attrib.block_size;
2290 else
2291 bidi_length = cmd->data_length;
2292
2293 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2294 &cmd->t_bidi_data_nents,
2295 bidi_length, zero_flag);
2296 if (ret < 0)
2297 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2298 }
2299
19f9361a 2300 if (cmd->prot_op != TARGET_PROT_NORMAL) {
acb2bde3
SG		 2301 ret = target_alloc_sgl(&cmd->t_prot_sg,
2302 &cmd->t_prot_nents,
2303 cmd->prot_length, true);
2304 if (ret < 0)
2305 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2306 }
2307
20093994
NB		 2308 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2309 cmd->data_length, zero_flag);
c66ac9db 2310 if (ret < 0)
de103c93 2311 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2312 }
c66ac9db 2313 /*
c3196f0c
CH		 2314 * If this command is not a write we can execute it right here,
2315 * for write buffers we need to notify the fabric driver first
2316 * and let it call back once the write buffers are ready.
c66ac9db 2317 */
5f41a31d 2318 target_add_to_state_list(cmd);
885e7b0e 2319 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2320 target_execute_cmd(cmd);
2321 return 0;
2322 }
862e6389 2323 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2324
2325 ret = cmd->se_tfo->write_pending(cmd);
2326 if (ret == -EAGAIN || ret == -ENOMEM)
2327 goto queue_full;
2328
de103c93
CH		 2329 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2330 WARN_ON(ret);
2331
b69c1fcf 2332 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2333
c3196f0c
CH		 2334queue_full:
2335 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2336 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2337 transport_handle_queue_full(cmd, cmd->se_dev);
2338 return 0;
c66ac9db 2339}
a1d8b49a 2340EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2341
e057f533 2342static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2343{
f147abb4
NB		 2344 int ret;
2345
2346 ret = cmd->se_tfo->write_pending(cmd);
2347 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2348 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2349 cmd);
2350 transport_handle_queue_full(cmd, cmd->se_dev);
2351 }
07bde79a
NB		 2352}
2353
d5ddad41 2354int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2355{
c130480b 2356 unsigned long flags;
d5ddad41
NB		 2357 int ret = 0;
2358
d14921d6 2359 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2360 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2361 transport_wait_for_tasks(cmd);
2362
d5ddad41 2363 ret = transport_release_cmd(cmd);
d14921d6
NB		 2364 } else {
2365 if (wait_for_tasks)
2366 transport_wait_for_tasks(cmd);
c130480b
NB		 2367 /*
2368 * Handle WRITE failure case where transport_generic_new_cmd()
2369 * has already added se_cmd to state_list, but fabric has
2370 * failed command before I/O submission.
2371 */
2372 if (cmd->state_active) {
2373 spin_lock_irqsave(&cmd->t_state_lock, flags);
2374 target_remove_from_state_list(cmd);
2375 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2376 }
d14921d6 2377
82f1c8a4 2378 if (cmd->se_lun)
c66ac9db 2379 transport_lun_remove_cmd(cmd);
c66ac9db 2380
d5ddad41 2381 ret = transport_put_cmd(cmd);
c66ac9db 2382 }
d5ddad41 2383 return ret;
c66ac9db
NB		 2384}
2385EXPORT_SYMBOL(transport_generic_free_cmd);
2386
a17f091d
NB		 2387/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2388 * @se_sess: session to reference
2389 * @se_cmd: command descriptor to add
a6360785 2390 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2391 */
20361e69 2392int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2393 bool ack_kref)
a17f091d
NB		 2394{
2395 unsigned long flags;
bc187ea6 2396 int ret = 0;
a17f091d 2397
a6360785
NB		 2398 /*
2399 * Add a second kref if the fabric caller is expecting to handle
2400 * fabric acknowledgement that requires two target_put_sess_cmd()
2401 * invocations before se_cmd descriptor release.
2402 */
0bcc297e 2403 if (ack_kref) {
a6360785 2404 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2405 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2406 }
7481deb4 2407
a17f091d 2408 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2409 if (se_sess->sess_tearing_down) {
2410 ret = -ESHUTDOWN;
2411 goto out;
2412 }
a17f091d 2413 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2414out:
a17f091d 2415 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2416 return ret;
a17f091d 2417}
20361e69 2418EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2419
7481deb4 2420static void target_release_cmd_kref(struct kref *kref)
a17f091d 2421{
7481deb4
NB		 2422 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2423 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2424
a17f091d 2425 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2426 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2427 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2428 return;
a17f091d 2429 }
a17f091d 2430 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2431 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2432 complete(&se_cmd->cmd_wait_comp);
7481deb4 2433 return;
a17f091d
NB		 2434 }
2435 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2436 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2437
7481deb4
NB		 2438 se_cmd->se_tfo->release_cmd(se_cmd);
2439}
2440
2441/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2442 * @se_sess: session to reference
2443 * @se_cmd: command descriptor to drop
2444 */
2445int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2446{
0ed6e189
NB		 2447 if (!se_sess) {
2448 se_cmd->se_tfo->release_cmd(se_cmd);
2449 return 1;
2450 }
ccf5ae83
JE		 2451 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2452 &se_sess->sess_cmd_lock);
a17f091d
NB		 2453}
2454EXPORT_SYMBOL(target_put_sess_cmd);
2455
1c7b13fe
RD		 2456/* target_sess_cmd_list_set_waiting - Flag all commands in
2457 * sess_cmd_list to complete cmd_wait_comp. Set
2458 * sess_tearing_down so no more commands are queued.
2459 * @se_sess: session to flag
a17f091d 2460 */
1c7b13fe 2461void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2462{
2463 struct se_cmd *se_cmd;
2464 unsigned long flags;
2465
a17f091d 2466 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2467 if (se_sess->sess_tearing_down) {
2468 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2469 return;
2470 }
1c7b13fe 2471 se_sess->sess_tearing_down = 1;
9b31a328 2472 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2473
9b31a328 2474 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2475 se_cmd->cmd_wait_set = 1;
2476
2477 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2478}
1c7b13fe 2479EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2480
2481/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2482 * @se_sess: session to wait for active I/O
a17f091d 2483 */
be646c2d 2484void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2485{
2486 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2487 unsigned long flags;
a17f091d
NB		 2488
2489 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2490 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2491 list_del(&se_cmd->se_cmd_list);
2492
2493 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2494 " %d\n", se_cmd, se_cmd->t_state,
2495 se_cmd->se_tfo->get_cmd_state(se_cmd));
2496
be646c2d
JE		 2497 wait_for_completion(&se_cmd->cmd_wait_comp);
2498 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2499 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2500 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2501
2502 se_cmd->se_tfo->release_cmd(se_cmd);
2503 }
9b31a328
NB		 2504
2505 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2506 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2507 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2508
a17f091d
NB		 2509}
2510EXPORT_SYMBOL(target_wait_for_sess_cmds);
2511
5277797d 2512static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2513{
8359cf43 2514 struct se_lun *lun = p;
c66ac9db 2515
5277797d
NB		 2516 percpu_ref_kill(&lun->lun_ref);
2517
2518 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2519 complete(&lun->lun_shutdown_comp);
2520
2521 return 0;
2522}
2523
5277797d 2524int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2525{
2526 struct task_struct *kt;
2527
5277797d 2528 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2529 "tcm_cl_%u", lun->unpacked_lun);
2530 if (IS_ERR(kt)) {
6708bb27 2531 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2532 return PTR_ERR(kt);
c66ac9db
NB		 2533 }
2534 wait_for_completion(&lun->lun_shutdown_comp);
2535
2536 return 0;
2537}
2538
d14921d6
NB		 2539/**
2540 * transport_wait_for_tasks - wait for completion to occur
2541 * @cmd: command to wait
c66ac9db 2542 *
d14921d6
NB		 2543 * Called from frontend fabric context to wait for storage engine
2544 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2545 */
a17f091d 2546bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2547{
2548 unsigned long flags;
2549
a1d8b49a 2550 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2551 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2552 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2553 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2554 return false;
d14921d6 2555 }
cb4f4d3c 2556
c8e31f26
AG		 2557 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2558 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2559 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2560 return false;
d14921d6 2561 }
7d680f3b 2562
3d28934a 2563 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2564 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2565 return false;
d14921d6 2566 }
c66ac9db 2567
7d680f3b 2568 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2569
6708bb27 2570 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2571 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2572 cmd, cmd->se_tfo->get_task_tag(cmd),
2573 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2574
a1d8b49a 2575 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2576
a1d8b49a 2577 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2578
a1d8b49a 2579 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2580 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2581
35d1efe8 2582 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2583 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2584 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2585
d14921d6 2586 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2587
2588 return true;
c66ac9db 2589}
d14921d6 2590EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2591
2592static int transport_get_sense_codes(
2593 struct se_cmd *cmd,
2594 u8 *asc,
2595 u8 *ascq)
2596{
2597 *asc = cmd->scsi_asc;
2598 *ascq = cmd->scsi_ascq;
2599
2600 return 0;
2601}
2602
76736db3
SG		 2603static
2604void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2605{
2606 /* Place failed LBA in sense data information descriptor 0. */
2607 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2608 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2609 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2610 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2611
2612 /* Descriptor Information: failing sector */
2613 put_unaligned_be64(bad_sector, &buffer[12]);
2614}
2615
de103c93
CH		 2616int
2617transport_send_check_condition_and_sense(struct se_cmd *cmd,
2618 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2619{
2620 unsigned char *buffer = cmd->sense_buffer;
2621 unsigned long flags;
c66ac9db
NB		 2622 u8 asc = 0, ascq = 0;
2623
a1d8b49a 2624 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2625 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2626 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2627 return 0;
2628 }
2629 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2630 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2631
2632 if (!reason && from_transport)
2633 goto after_reason;
2634
2635 if (!from_transport)
2636 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2637
c66ac9db
NB		 2638 /*
2639 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2640 * SENSE KEY values from include/scsi/scsi.h
2641 */
2642 switch (reason) {
ba829137
HR		 2643 case TCM_NO_SENSE:
2644 /* CURRENT ERROR */
2645 buffer[0] = 0x70;
2646 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2647 /* Not Ready */
2648 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2649 /* NO ADDITIONAL SENSE INFORMATION */
2650 buffer[SPC_ASC_KEY_OFFSET] = 0;
2651 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2652 break;
c66ac9db 2653 case TCM_NON_EXISTENT_LUN:
eb39d340 2654 /* CURRENT ERROR */
9c58b7dd
RD		 2655 buffer[0] = 0x70;
2656 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2657 /* ILLEGAL REQUEST */
9c58b7dd 2658 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2659 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2660 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2661 break;
c66ac9db
NB		 2662 case TCM_UNSUPPORTED_SCSI_OPCODE:
2663 case TCM_SECTOR_COUNT_TOO_MANY:
2664 /* CURRENT ERROR */
9c58b7dd
RD		 2665 buffer[0] = 0x70;
2666 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2667 /* ILLEGAL REQUEST */
9c58b7dd 2668 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2669 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2670 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2671 break;
2672 case TCM_UNKNOWN_MODE_PAGE:
2673 /* CURRENT ERROR */
9c58b7dd
RD		 2674 buffer[0] = 0x70;
2675 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2676 /* ILLEGAL REQUEST */
9c58b7dd 2677 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2678 /* INVALID FIELD IN CDB */
9c58b7dd 2679 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2680 break;
2681 case TCM_CHECK_CONDITION_ABORT_CMD:
2682 /* CURRENT ERROR */
9c58b7dd
RD		 2683 buffer[0] = 0x70;
2684 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2685 /* ABORTED COMMAND */
9c58b7dd 2686 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2687 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2688 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2689 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2690 break;
2691 case TCM_INCORRECT_AMOUNT_OF_DATA:
2692 /* CURRENT ERROR */
9c58b7dd
RD		 2693 buffer[0] = 0x70;
2694 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2695 /* ABORTED COMMAND */
9c58b7dd 2696 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2697 /* WRITE ERROR */
9c58b7dd 2698 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2699 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2700 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2701 break;
2702 case TCM_INVALID_CDB_FIELD:
2703 /* CURRENT ERROR */
9c58b7dd
RD		 2704 buffer[0] = 0x70;
2705 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2706 /* ILLEGAL REQUEST */
9c58b7dd 2707 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2708 /* INVALID FIELD IN CDB */
9c58b7dd 2709 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2710 break;
2711 case TCM_INVALID_PARAMETER_LIST:
2712 /* CURRENT ERROR */
9c58b7dd
RD		 2713 buffer[0] = 0x70;
2714 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2715 /* ILLEGAL REQUEST */
9c58b7dd 2716 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2717 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2718 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2719 break;
bb992e72
RD		 2720 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2721 /* CURRENT ERROR */
2722 buffer[0] = 0x70;
2723 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2724 /* ILLEGAL REQUEST */
2725 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2726 /* PARAMETER LIST LENGTH ERROR */
2727 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2728 break;
c66ac9db
NB		 2729 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2730 /* CURRENT ERROR */
9c58b7dd
RD		 2731 buffer[0] = 0x70;
2732 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2733 /* ABORTED COMMAND */
9c58b7dd 2734 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2735 /* WRITE ERROR */
9c58b7dd 2736 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2737 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2738 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2739 break;
2740 case TCM_SERVICE_CRC_ERROR:
2741 /* CURRENT ERROR */
9c58b7dd
RD		 2742 buffer[0] = 0x70;
2743 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2744 /* ABORTED COMMAND */
9c58b7dd 2745 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2746 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2747 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2748 /* N/A */
9c58b7dd 2749 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2750 break;
2751 case TCM_SNACK_REJECTED:
2752 /* CURRENT ERROR */
9c58b7dd
RD		 2753 buffer[0] = 0x70;
2754 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2755 /* ABORTED COMMAND */
9c58b7dd 2756 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2757 /* READ ERROR */
9c58b7dd 2758 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2759 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2760 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2761 break;
2762 case TCM_WRITE_PROTECTED:
2763 /* CURRENT ERROR */
9c58b7dd
RD		 2764 buffer[0] = 0x70;
2765 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2766 /* DATA PROTECT */
9c58b7dd 2767 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2768 /* WRITE PROTECTED */
9c58b7dd 2769 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2770 break;
e2397c70
RD		 2771 case TCM_ADDRESS_OUT_OF_RANGE:
2772 /* CURRENT ERROR */
9c58b7dd
RD		 2773 buffer[0] = 0x70;
2774 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2775 /* ILLEGAL REQUEST */
9c58b7dd 2776 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2777 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2778 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2779 break;
c66ac9db
NB		 2780 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2781 /* CURRENT ERROR */
9c58b7dd
RD		 2782 buffer[0] = 0x70;
2783 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2784 /* UNIT ATTENTION */
9c58b7dd 2785 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2786 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2787 buffer[SPC_ASC_KEY_OFFSET] = asc;
2788 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2789 break;
2790 case TCM_CHECK_CONDITION_NOT_READY:
2791 /* CURRENT ERROR */
9c58b7dd
RD		 2792 buffer[0] = 0x70;
2793 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2794 /* Not Ready */
9c58b7dd 2795 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2796 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2797 buffer[SPC_ASC_KEY_OFFSET] = asc;
2798 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2799 break;
818b571c
NB		 2800 case TCM_MISCOMPARE_VERIFY:
2801 /* CURRENT ERROR */
2802 buffer[0] = 0x70;
2803 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2804 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2805 /* MISCOMPARE DURING VERIFY OPERATION */
2806 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2807 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2808 break;
fcc4f17b
NB		 2809 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2810 /* CURRENT ERROR */
2811 buffer[0] = 0x70;
2812 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2813 /* ILLEGAL REQUEST */
2814 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2815 /* LOGICAL BLOCK GUARD CHECK FAILED */
2816 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2817 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
76736db3 2818 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2819 break;
2820 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2821 /* CURRENT ERROR */
2822 buffer[0] = 0x70;
2823 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2824 /* ILLEGAL REQUEST */
2825 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2826 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2827 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2828 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
76736db3 2829 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2830 break;
2831 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2832 /* CURRENT ERROR */
2833 buffer[0] = 0x70;
2834 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2835 /* ILLEGAL REQUEST */
2836 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2837 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2838 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2839 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
76736db3 2840 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b 2841 break;
c66ac9db
NB		 2842 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2843 default:
2844 /* CURRENT ERROR */
9c58b7dd
RD		 2845 buffer[0] = 0x70;
2846 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2847 /*
2848 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2849 * Solaris initiators. Returning NOT READY instead means the
2850 * operations will be retried a finite number of times and we
2851 * can survive intermittent errors.
2852 */
2853 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2854 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2855 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2856 break;
2857 }
2858 /*
2859 * This code uses linux/include/scsi/scsi.h SAM status codes!
2860 */
2861 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2862 /*
2863 * Automatically padded, this value is encoded in the fabric's
2864 * data_length response PDU containing the SCSI defined sense data.
2865 */
9c58b7dd 2866 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2867
2868after_reason:
e5c0d6ad 2869 trace_target_cmd_complete(cmd);
07bde79a 2870 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2871}
2872EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2873
2874int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2875{
c18bc7d8
RD		 2876 if (!(cmd->transport_state & CMD_T_ABORTED))
2877 return 0;
c66ac9db 2878
68259b5a
AL		 2879 /*
2880 * If cmd has been aborted but either no status is to be sent or it has
2881 * already been sent, just return
2882 */
2883 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2884 return 1;
8b1e1244 2885
c18bc7d8
RD		 2886 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2887 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2888
68259b5a 2889 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2890 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2891 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2892 cmd->se_tfo->queue_status(cmd);
2893
2894 return 1;
c66ac9db
NB		 2895}
2896EXPORT_SYMBOL(transport_check_aborted_status);
2897
2898void transport_send_task_abort(struct se_cmd *cmd)
2899{
c252f003
NB		 2900 unsigned long flags;
2901
2902 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2903 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2904 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2905 return;
2906 }
2907 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2908
c66ac9db
NB		 2909 /*
2910 * If there are still expected incoming fabric WRITEs, we wait
2911 * until until they have completed before sending a TASK_ABORTED
2912 * response. This response with TASK_ABORTED status will be
2913 * queued back to fabric module by transport_check_aborted_status().
2914 */
2915 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2916 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2917 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 2918 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
29f4c090 2919 return;
c66ac9db
NB		 2920 }
2921 }
2922 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2923
72b59d6e
RD		 2924 transport_lun_remove_cmd(cmd);
2925
6708bb27 2926 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2927 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2928 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2929
e5c0d6ad 2930 trace_target_cmd_complete(cmd);
e3d6f909 2931 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2932}
2933
af877292 2934static void target_tmr_work(struct work_struct *work)
c66ac9db 2935{
af877292 2936 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2937 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2938 struct se_tmr_req *tmr = cmd->se_tmr_req;
2939 int ret;
2940
2941 switch (tmr->function) {
5c6cd613 2942 case TMR_ABORT_TASK:
3d28934a 2943 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2944 break;
5c6cd613
NB		 2945 case TMR_ABORT_TASK_SET:
2946 case TMR_CLEAR_ACA:
2947 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2948 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2949 break;
5c6cd613 2950 case TMR_LUN_RESET:
c66ac9db
NB		 2951 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2952 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2953 TMR_FUNCTION_REJECTED;
2954 break;
5c6cd613 2955 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2956 tmr->response = TMR_FUNCTION_REJECTED;
2957 break;
5c6cd613 2958 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2959 tmr->response = TMR_FUNCTION_REJECTED;
2960 break;
c66ac9db 2961 default:
6708bb27 2962 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2963 tmr->function);
2964 tmr->response = TMR_FUNCTION_REJECTED;
2965 break;
2966 }
2967
2968 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2969 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2970
b7b8bef7 2971 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2972}
2973
af877292
CH		 2974int transport_generic_handle_tmr(
2975 struct se_cmd *cmd)
c66ac9db 2976{
f15e9cd9
NB		 2977 unsigned long flags;
2978
2979 spin_lock_irqsave(&cmd->t_state_lock, flags);
2980 cmd->transport_state |= CMD_T_ACTIVE;
2981 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2982
af877292
CH		 2983 INIT_WORK(&cmd->work, target_tmr_work);
2984 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2985 return 0;
2986}
af877292 2987EXPORT_SYMBOL(transport_generic_handle_tmr);
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