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target: Subsume se_port + t10_alua_tg_pt_gp_member into se_lun
[deliverable/linux.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 47
e26d99ae 48#include "target_core_internal.h"
c66ac9db 49#include "target_core_alua.h"
c66ac9db 50#include "target_core_pr.h"
c66ac9db
NB		 51#include "target_core_ua.h"
52
e5c0d6ad
RD		 53#define CREATE_TRACE_POINTS
54#include <trace/events/target.h>
55
35e0e757 56static struct workqueue_struct *target_completion_wq;
c66ac9db 57static struct kmem_cache *se_sess_cache;
c66ac9db 58struct kmem_cache *se_ua_cache;
c66ac9db
NB		 59struct kmem_cache *t10_pr_reg_cache;
60struct kmem_cache *t10_alua_lu_gp_cache;
61struct kmem_cache *t10_alua_lu_gp_mem_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_cache;
229d4f11
HR		 63struct kmem_cache *t10_alua_lba_map_cache;
64struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 65
c66ac9db 66static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 67static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 68 struct se_device *dev);
d5ddad41 69static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 70static void target_complete_ok_work(struct work_struct *work);
c66ac9db 71
e3d6f909 72int init_se_kmem_caches(void)
c66ac9db 73{
c66ac9db
NB		 74 se_sess_cache = kmem_cache_create("se_sess_cache",
75 sizeof(struct se_session), __alignof__(struct se_session),
76 0, NULL);
6708bb27
AG		 77 if (!se_sess_cache) {
78 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 79 " failed\n");
c8e31f26 80 goto out;
c66ac9db
NB		 81 }
82 se_ua_cache = kmem_cache_create("se_ua_cache",
83 sizeof(struct se_ua), __alignof__(struct se_ua),
84 0, NULL);
6708bb27
AG		 85 if (!se_ua_cache) {
86 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 87 goto out_free_sess_cache;
c66ac9db 88 }
c66ac9db
NB		 89 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
90 sizeof(struct t10_pr_registration),
91 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 92 if (!t10_pr_reg_cache) {
93 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 94 " failed\n");
35e0e757 95 goto out_free_ua_cache;
c66ac9db
NB		 96 }
97 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
98 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
99 0, NULL);
6708bb27
AG		 100 if (!t10_alua_lu_gp_cache) {
101 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 102 " failed\n");
35e0e757 103 goto out_free_pr_reg_cache;
c66ac9db
NB		 104 }
105 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
106 sizeof(struct t10_alua_lu_gp_member),
107 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 108 if (!t10_alua_lu_gp_mem_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 110 "cache failed\n");
35e0e757 111 goto out_free_lu_gp_cache;
c66ac9db
NB		 112 }
113 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
114 sizeof(struct t10_alua_tg_pt_gp),
115 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 116 if (!t10_alua_tg_pt_gp_cache) {
117 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 118 "cache failed\n");
35e0e757 119 goto out_free_lu_gp_mem_cache;
c66ac9db 120 }
229d4f11
HR		 121 t10_alua_lba_map_cache = kmem_cache_create(
122 "t10_alua_lba_map_cache",
123 sizeof(struct t10_alua_lba_map),
124 __alignof__(struct t10_alua_lba_map), 0, NULL);
125 if (!t10_alua_lba_map_cache) {
126 pr_err("kmem_cache_create() for t10_alua_lba_map_"
127 "cache failed\n");
adf653f9 128 goto out_free_tg_pt_gp_cache;
229d4f11
HR		 129 }
130 t10_alua_lba_map_mem_cache = kmem_cache_create(
131 "t10_alua_lba_map_mem_cache",
132 sizeof(struct t10_alua_lba_map_member),
133 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
134 if (!t10_alua_lba_map_mem_cache) {
135 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
136 "cache failed\n");
137 goto out_free_lba_map_cache;
138 }
c66ac9db 139
35e0e757
CH		 140 target_completion_wq = alloc_workqueue("target_completion",
141 WQ_MEM_RECLAIM, 0);
142 if (!target_completion_wq)
229d4f11 143 goto out_free_lba_map_mem_cache;
35e0e757 144
c66ac9db 145 return 0;
35e0e757 146
229d4f11
HR		 147out_free_lba_map_mem_cache:
148 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
149out_free_lba_map_cache:
150 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 151out_free_tg_pt_gp_cache:
152 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
153out_free_lu_gp_mem_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
155out_free_lu_gp_cache:
156 kmem_cache_destroy(t10_alua_lu_gp_cache);
157out_free_pr_reg_cache:
158 kmem_cache_destroy(t10_pr_reg_cache);
159out_free_ua_cache:
160 kmem_cache_destroy(se_ua_cache);
161out_free_sess_cache:
162 kmem_cache_destroy(se_sess_cache);
c66ac9db 163out:
e3d6f909 164 return -ENOMEM;
c66ac9db
NB		 165}
166
e3d6f909 167void release_se_kmem_caches(void)
c66ac9db 168{
35e0e757 169 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 170 kmem_cache_destroy(se_sess_cache);
171 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 172 kmem_cache_destroy(t10_pr_reg_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
229d4f11
HR		 176 kmem_cache_destroy(t10_alua_lba_map_cache);
177 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 178}
179
e3d6f909
AG		 180/* This code ensures unique mib indexes are handed out. */
181static DEFINE_SPINLOCK(scsi_mib_index_lock);
182static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 183
184/*
185 * Allocate a new row index for the entry type specified
186 */
187u32 scsi_get_new_index(scsi_index_t type)
188{
189 u32 new_index;
190
e3d6f909 191 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 192
e3d6f909
AG		 193 spin_lock(&scsi_mib_index_lock);
194 new_index = ++scsi_mib_index[type];
195 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 196
197 return new_index;
198}
199
dbc5623e 200void transport_subsystem_check_init(void)
c66ac9db
NB		 201{
202 int ret;
283669d2 203 static int sub_api_initialized;
c66ac9db 204
dbc5623e
NB		 205 if (sub_api_initialized)
206 return;
207
c66ac9db
NB		 208 ret = request_module("target_core_iblock");
209 if (ret != 0)
6708bb27 210 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 211
212 ret = request_module("target_core_file");
213 if (ret != 0)
6708bb27 214 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 215
216 ret = request_module("target_core_pscsi");
217 if (ret != 0)
6708bb27 218 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 219
7c9e7a6f
AG		 220 ret = request_module("target_core_user");
221 if (ret != 0)
222 pr_err("Unable to load target_core_user\n");
223
e3d6f909 224 sub_api_initialized = 1;
c66ac9db
NB		 225}
226
e70beee7 227struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 228{
229 struct se_session *se_sess;
230
231 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 232 if (!se_sess) {
233 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 234 " se_sess_cache\n");
235 return ERR_PTR(-ENOMEM);
236 }
237 INIT_LIST_HEAD(&se_sess->sess_list);
238 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 239 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 240 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 241 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 242 kref_init(&se_sess->sess_kref);
e70beee7 243 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 244
245 return se_sess;
246}
247EXPORT_SYMBOL(transport_init_session);
248
c0add7fd
NB		 249int transport_alloc_session_tags(struct se_session *se_sess,
250 unsigned int tag_num, unsigned int tag_size)
251{
252 int rc;
253
8c7f6e9b
NB		 254 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
255 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 256 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 257 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
258 if (!se_sess->sess_cmd_map) {
259 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
260 return -ENOMEM;
261 }
c0add7fd
NB		 262 }
263
264 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
265 if (rc < 0) {
266 pr_err("Unable to init se_sess->sess_tag_pool,"
267 " tag_num: %u\n", tag_num);
8c7f6e9b
NB		 268 if (is_vmalloc_addr(se_sess->sess_cmd_map))
269 vfree(se_sess->sess_cmd_map);
270 else
271 kfree(se_sess->sess_cmd_map);
c0add7fd
NB		 272 se_sess->sess_cmd_map = NULL;
273 return -ENOMEM;
274 }
275
276 return 0;
277}
278EXPORT_SYMBOL(transport_alloc_session_tags);
279
280struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 281 unsigned int tag_size,
282 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 283{
284 struct se_session *se_sess;
285 int rc;
286
e70beee7 287 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 288 if (IS_ERR(se_sess))
289 return se_sess;
290
291 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
292 if (rc < 0) {
293 transport_free_session(se_sess);
294 return ERR_PTR(-ENOMEM);
295 }
296
297 return se_sess;
298}
299EXPORT_SYMBOL(transport_init_session_tags);
300
c66ac9db 301/*
140854cb 302 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 303 */
304void __transport_register_session(
305 struct se_portal_group *se_tpg,
306 struct se_node_acl *se_nacl,
307 struct se_session *se_sess,
308 void *fabric_sess_ptr)
309{
9ac8928e 310 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 311 unsigned char buf[PR_REG_ISID_LEN];
312
313 se_sess->se_tpg = se_tpg;
314 se_sess->fabric_sess_ptr = fabric_sess_ptr;
315 /*
316 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
317 *
318 * Only set for struct se_session's that will actually be moving I/O.
319 * eg: *NOT* discovery sessions.
320 */
321 if (se_nacl) {
bffb5128
NB		 322 /*
323 *
324 * Determine if fabric allows for T10-PI feature bits exposed to
325 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
326 *
327 * If so, then always save prot_type on a per se_node_acl node
328 * basis and re-instate the previous sess_prot_type to avoid
329 * disabling PI from below any previously initiator side
330 * registered LUNs.
331 */
332 if (se_nacl->saved_prot_type)
333 se_sess->sess_prot_type = se_nacl->saved_prot_type;
334 else if (tfo->tpg_check_prot_fabric_only)
335 se_sess->sess_prot_type = se_nacl->saved_prot_type =
336 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 337 /*
338 * If the fabric module supports an ISID based TransportID,
339 * save this value in binary from the fabric I_T Nexus now.
340 */
e3d6f909 341 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 342 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 343 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 344 &buf[0], PR_REG_ISID_LEN);
345 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
346 }
afb999ff
NB		 347 kref_get(&se_nacl->acl_kref);
348
c66ac9db
NB		 349 spin_lock_irq(&se_nacl->nacl_sess_lock);
350 /*
351 * The se_nacl->nacl_sess pointer will be set to the
352 * last active I_T Nexus for each struct se_node_acl.
353 */
354 se_nacl->nacl_sess = se_sess;
355
356 list_add_tail(&se_sess->sess_acl_list,
357 &se_nacl->acl_sess_list);
358 spin_unlock_irq(&se_nacl->nacl_sess_lock);
359 }
360 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
361
6708bb27 362 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 363 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 364}
365EXPORT_SYMBOL(__transport_register_session);
366
367void transport_register_session(
368 struct se_portal_group *se_tpg,
369 struct se_node_acl *se_nacl,
370 struct se_session *se_sess,
371 void *fabric_sess_ptr)
372{
140854cb
NB		 373 unsigned long flags;
374
375 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 376 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 377 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 378}
379EXPORT_SYMBOL(transport_register_session);
380
ecf0dd66 381static void target_release_session(struct kref *kref)
41ac82b6
NB		 382{
383 struct se_session *se_sess = container_of(kref,
384 struct se_session, sess_kref);
385 struct se_portal_group *se_tpg = se_sess->se_tpg;
386
387 se_tpg->se_tpg_tfo->close_session(se_sess);
388}
389
390void target_get_session(struct se_session *se_sess)
391{
392 kref_get(&se_sess->sess_kref);
393}
394EXPORT_SYMBOL(target_get_session);
395
33933a0e 396void target_put_session(struct se_session *se_sess)
41ac82b6 397{
33933a0e 398 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 399}
400EXPORT_SYMBOL(target_put_session);
401
f8e471f9
NB		 402ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
403{
404 struct se_session *se_sess;
405 ssize_t len = 0;
406
407 spin_lock_bh(&se_tpg->session_lock);
408 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
409 if (!se_sess->se_node_acl)
410 continue;
411 if (!se_sess->se_node_acl->dynamic_node_acl)
412 continue;
413 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
414 break;
415
416 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
417 se_sess->se_node_acl->initiatorname);
418 len += 1; /* Include NULL terminator */
419 }
420 spin_unlock_bh(&se_tpg->session_lock);
421
422 return len;
423}
424EXPORT_SYMBOL(target_show_dynamic_sessions);
425
afb999ff
NB		 426static void target_complete_nacl(struct kref *kref)
427{
428 struct se_node_acl *nacl = container_of(kref,
429 struct se_node_acl, acl_kref);
430
431 complete(&nacl->acl_free_comp);
432}
433
434void target_put_nacl(struct se_node_acl *nacl)
435{
436 kref_put(&nacl->acl_kref, target_complete_nacl);
437}
438
c66ac9db
NB		 439void transport_deregister_session_configfs(struct se_session *se_sess)
440{
441 struct se_node_acl *se_nacl;
23388864 442 unsigned long flags;
c66ac9db
NB		 443 /*
444 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
445 */
446 se_nacl = se_sess->se_node_acl;
6708bb27 447 if (se_nacl) {
23388864 448 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 449 if (se_nacl->acl_stop == 0)
450 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 451 /*
452 * If the session list is empty, then clear the pointer.
453 * Otherwise, set the struct se_session pointer from the tail
454 * element of the per struct se_node_acl active session list.
455 */
456 if (list_empty(&se_nacl->acl_sess_list))
457 se_nacl->nacl_sess = NULL;
458 else {
459 se_nacl->nacl_sess = container_of(
460 se_nacl->acl_sess_list.prev,
461 struct se_session, sess_acl_list);
462 }
23388864 463 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 464 }
465}
466EXPORT_SYMBOL(transport_deregister_session_configfs);
467
468void transport_free_session(struct se_session *se_sess)
469{
c0add7fd
NB		 470 if (se_sess->sess_cmd_map) {
471 percpu_ida_destroy(&se_sess->sess_tag_pool);
8c7f6e9b
NB		 472 if (is_vmalloc_addr(se_sess->sess_cmd_map))
473 vfree(se_sess->sess_cmd_map);
474 else
475 kfree(se_sess->sess_cmd_map);
c0add7fd 476 }
c66ac9db
NB		 477 kmem_cache_free(se_sess_cache, se_sess);
478}
479EXPORT_SYMBOL(transport_free_session);
480
481void transport_deregister_session(struct se_session *se_sess)
482{
483 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 484 const struct target_core_fabric_ops *se_tfo;
c66ac9db 485 struct se_node_acl *se_nacl;
e63a8e19 486 unsigned long flags;
403edd78 487 bool comp_nacl = true, drop_nacl = false;
c66ac9db 488
6708bb27 489 if (!se_tpg) {
c66ac9db
NB		 490 transport_free_session(se_sess);
491 return;
492 }
01468346 493 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 494
e63a8e19 495 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 496 list_del(&se_sess->sess_list);
497 se_sess->se_tpg = NULL;
498 se_sess->fabric_sess_ptr = NULL;
e63a8e19 499 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 500
501 /*
502 * Determine if we need to do extra work for this initiator node's
503 * struct se_node_acl if it had been previously dynamically generated.
504 */
505 se_nacl = se_sess->se_node_acl;
01468346 506
403edd78 507 mutex_lock(&se_tpg->acl_node_mutex);
01468346
NB		 508 if (se_nacl && se_nacl->dynamic_node_acl) {
509 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
510 list_del(&se_nacl->acl_list);
511 se_tpg->num_node_acls--;
403edd78 512 drop_nacl = true;
c66ac9db 513 }
c66ac9db 514 }
403edd78 515 mutex_unlock(&se_tpg->acl_node_mutex);
c66ac9db 516
403edd78
NB		 517 if (drop_nacl) {
518 core_tpg_wait_for_nacl_pr_ref(se_nacl);
519 core_free_device_list_for_node(se_nacl, se_tpg);
520 kfree(se_nacl);
521 comp_nacl = false;
522 }
6708bb27 523 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 524 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 525 /*
125d0119 526 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 527 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
528 * removal context.
01468346 529 */
0bcc297e 530 if (se_nacl && comp_nacl)
afb999ff 531 target_put_nacl(se_nacl);
01468346 532
afb999ff 533 transport_free_session(se_sess);
c66ac9db
NB		 534}
535EXPORT_SYMBOL(transport_deregister_session);
536
537/*
a1d8b49a 538 * Called with cmd->t_state_lock held.
c66ac9db 539 */
cf572a96 540static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 541{
42bf829e 542 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 543 unsigned long flags;
544
42bf829e
CH		 545 if (!dev)
546 return;
c66ac9db 547
cf572a96
CH		 548 if (cmd->transport_state & CMD_T_BUSY)
549 return;
c66ac9db 550
cf572a96
CH		 551 spin_lock_irqsave(&dev->execute_task_lock, flags);
552 if (cmd->state_active) {
553 list_del(&cmd->state_list);
cf572a96 554 cmd->state_active = false;
c66ac9db 555 }
cf572a96 556 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 557}
558
862e6389
NB		 559static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
560 bool write_pending)
c66ac9db
NB		 561{
562 unsigned long flags;
563
a1d8b49a 564 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 565 if (write_pending)
566 cmd->t_state = TRANSPORT_WRITE_PENDING;
567
f7113a47
CH		 568 if (remove_from_lists) {
569 target_remove_from_state_list(cmd);
570
571 /*
572 * Clear struct se_cmd->se_lun before the handoff to FE.
573 */
574 cmd->se_lun = NULL;
575 }
576
c66ac9db
NB		 577 /*
578 * Determine if frontend context caller is requesting the stopping of
e3d6f909 579 * this command for frontend exceptions.
c66ac9db 580 */
7d680f3b 581 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 582 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
583 __func__, __LINE__, cmd->tag);
c66ac9db 584
a1d8b49a 585 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 586
a95d6511 587 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 588 return 1;
589 }
f7113a47
CH		 590
591 cmd->transport_state &= ~CMD_T_ACTIVE;
592 if (remove_from_lists) {
593 /*
594 * Some fabric modules like tcm_loop can release
595 * their internally allocated I/O reference now and
596 * struct se_cmd now.
597 *
598 * Fabric modules are expected to return '1' here if the
599 * se_cmd being passed is released at this point,
600 * or zero if not being released.
601 */
602 if (cmd->se_tfo->check_stop_free != NULL) {
603 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
604 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 605 }
f7113a47 606 }
c66ac9db 607
a1d8b49a 608 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 609 return 0;
610}
611
612static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
613{
862e6389 614 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 615}
616
617static void transport_lun_remove_cmd(struct se_cmd *cmd)
618{
e3d6f909 619 struct se_lun *lun = cmd->se_lun;
c66ac9db 620
5259a06e 621 if (!lun)
c66ac9db
NB		 622 return;
623
5259a06e
NB		 624 if (cmpxchg(&cmd->lun_ref_active, true, false))
625 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 626}
627
628void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
629{
68259b5a
AL		 630 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
631 transport_lun_remove_cmd(cmd);
131e6abc
NB		 632 /*
633 * Allow the fabric driver to unmap any resources before
634 * releasing the descriptor via TFO->release_cmd()
635 */
636 if (remove)
637 cmd->se_tfo->aborted_task(cmd);
68259b5a 638
c66ac9db
NB		 639 if (transport_cmd_check_stop_to_fabric(cmd))
640 return;
af877292 641 if (remove)
e6a2573f 642 transport_put_cmd(cmd);
c66ac9db
NB		 643}
644
35e0e757
CH		 645static void target_complete_failure_work(struct work_struct *work)
646{
647 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
648
de103c93
CH		 649 transport_generic_request_failure(cmd,
650 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 651}
652
6138ed2a 653/*
d5829eac
PB		 654 * Used when asking transport to copy Sense Data from the underlying
655 * Linux/SCSI struct scsi_cmnd
6138ed2a 656 */
d5829eac 657static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 658{
6138ed2a 659 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 660
661 WARN_ON(!cmd->se_lun);
662
663 if (!dev)
d5829eac 664 return NULL;
6138ed2a 665
d5829eac
PB		 666 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
667 return NULL;
6138ed2a 668
9c58b7dd 669 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 670
d5829eac 671 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 672 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 673 return cmd->sense_buffer;
6138ed2a
PB		 674}
675
5787cacd 676void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 677{
42bf829e 678 struct se_device *dev = cmd->se_dev;
5787cacd 679 int success = scsi_status == GOOD;
c66ac9db 680 unsigned long flags;
c66ac9db 681
5787cacd
CH		 682 cmd->scsi_status = scsi_status;
683
684
a1d8b49a 685 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 686 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 687
c66ac9db 688 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 689 dev->transport->transport_complete(cmd,
690 cmd->t_data_sg,
691 transport_get_sense_buffer(cmd));
692 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 693 success = 1;
c66ac9db
NB		 694 }
695
696 /*
5787cacd 697 * See if we are waiting to complete for an exception condition.
c66ac9db 698 */
cf572a96 699 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 700 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 701 complete(&cmd->task_stop_comp);
c66ac9db
NB		 702 return;
703 }
2235007c 704
3d28934a 705 /*
125d0119 706 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 707 * and transport_wait_for_tasks() will be waiting for completion..
708 */
709 if (cmd->transport_state & CMD_T_ABORTED &&
710 cmd->transport_state & CMD_T_STOP) {
711 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 712 complete_all(&cmd->t_transport_stop_comp);
3d28934a 713 return;
3dca1471 714 } else if (!success) {
35e0e757 715 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 716 } else {
35e0e757 717 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 718 }
35e0e757 719
35e0e757 720 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 721 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 722 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 723
35e0e757 724 queue_work(target_completion_wq, &cmd->work);
c66ac9db 725}
6bb35e00
CH		 726EXPORT_SYMBOL(target_complete_cmd);
727
2426bd45
RD		 728void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
729{
730 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
731 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
732 cmd->residual_count += cmd->data_length - length;
733 } else {
734 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
735 cmd->residual_count = cmd->data_length - length;
736 }
737
738 cmd->data_length = length;
739 }
740
741 target_complete_cmd(cmd, scsi_status);
742}
743EXPORT_SYMBOL(target_complete_cmd_with_length);
744
cf572a96 745static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 746{
cf572a96
CH		 747 struct se_device *dev = cmd->se_dev;
748 unsigned long flags;
c66ac9db 749
cf572a96
CH		 750 spin_lock_irqsave(&dev->execute_task_lock, flags);
751 if (!cmd->state_active) {
752 list_add_tail(&cmd->state_list, &dev->state_list);
753 cmd->state_active = true;
c66ac9db 754 }
cf572a96 755 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 756}
757
07bde79a 758/*
f147abb4 759 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 760 */
7a6f0a1e
CH		 761static void transport_write_pending_qf(struct se_cmd *cmd);
762static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 763
0fd97ccf 764void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 765{
766 struct se_device *dev = container_of(work, struct se_device,
767 qf_work_queue);
bcac364a 768 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 769 struct se_cmd *cmd, *cmd_tmp;
770
771 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 772 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
773 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 774
bcac364a 775 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 776 list_del(&cmd->se_qf_node);
33940d09 777 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 778
6708bb27 779 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 780 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 781 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 782 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
783 : "UNKNOWN");
f7a5cc0b 784
7a6f0a1e
CH		 785 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
786 transport_write_pending_qf(cmd);
787 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
788 transport_complete_qf(cmd);
07bde79a 789 }
07bde79a
NB		 790}
791
c66ac9db
NB		 792unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
793{
794 switch (cmd->data_direction) {
795 case DMA_NONE:
796 return "NONE";
797 case DMA_FROM_DEVICE:
798 return "READ";
799 case DMA_TO_DEVICE:
800 return "WRITE";
801 case DMA_BIDIRECTIONAL:
802 return "BIDI";
803 default:
804 break;
805 }
806
807 return "UNKNOWN";
808}
809
810void transport_dump_dev_state(
811 struct se_device *dev,
812 char *b,
813 int *bl)
814{
815 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 816 if (dev->export_count)
c66ac9db 817 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 818 else
c66ac9db 819 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 820
5f41a31d 821 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 822 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 823 dev->dev_attrib.block_size,
824 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 825 *bl += sprintf(b + *bl, " ");
826}
827
c66ac9db
NB		 828void transport_dump_vpd_proto_id(
829 struct t10_vpd *vpd,
830 unsigned char *p_buf,
831 int p_buf_len)
832{
833 unsigned char buf[VPD_TMP_BUF_SIZE];
834 int len;
835
836 memset(buf, 0, VPD_TMP_BUF_SIZE);
837 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
838
839 switch (vpd->protocol_identifier) {
840 case 0x00:
841 sprintf(buf+len, "Fibre Channel\n");
842 break;
843 case 0x10:
844 sprintf(buf+len, "Parallel SCSI\n");
845 break;
846 case 0x20:
847 sprintf(buf+len, "SSA\n");
848 break;
849 case 0x30:
850 sprintf(buf+len, "IEEE 1394\n");
851 break;
852 case 0x40:
853 sprintf(buf+len, "SCSI Remote Direct Memory Access"
854 " Protocol\n");
855 break;
856 case 0x50:
857 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
858 break;
859 case 0x60:
860 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
861 break;
862 case 0x70:
863 sprintf(buf+len, "Automation/Drive Interface Transport"
864 " Protocol\n");
865 break;
866 case 0x80:
867 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
868 break;
869 default:
870 sprintf(buf+len, "Unknown 0x%02x\n",
871 vpd->protocol_identifier);
872 break;
873 }
874
875 if (p_buf)
876 strncpy(p_buf, buf, p_buf_len);
877 else
6708bb27 878 pr_debug("%s", buf);
c66ac9db
NB		 879}
880
881void
882transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
883{
884 /*
885 * Check if the Protocol Identifier Valid (PIV) bit is set..
886 *
887 * from spc3r23.pdf section 7.5.1
888 */
889 if (page_83[1] & 0x80) {
890 vpd->protocol_identifier = (page_83[0] & 0xf0);
891 vpd->protocol_identifier_set = 1;
892 transport_dump_vpd_proto_id(vpd, NULL, 0);
893 }
894}
895EXPORT_SYMBOL(transport_set_vpd_proto_id);
896
897int transport_dump_vpd_assoc(
898 struct t10_vpd *vpd,
899 unsigned char *p_buf,
900 int p_buf_len)
901{
902 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 903 int ret = 0;
904 int len;
c66ac9db
NB		 905
906 memset(buf, 0, VPD_TMP_BUF_SIZE);
907 len = sprintf(buf, "T10 VPD Identifier Association: ");
908
909 switch (vpd->association) {
910 case 0x00:
911 sprintf(buf+len, "addressed logical unit\n");
912 break;
913 case 0x10:
914 sprintf(buf+len, "target port\n");
915 break;
916 case 0x20:
917 sprintf(buf+len, "SCSI target device\n");
918 break;
919 default:
920 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 921 ret = -EINVAL;
c66ac9db
NB		 922 break;
923 }
924
925 if (p_buf)
926 strncpy(p_buf, buf, p_buf_len);
927 else
6708bb27 928 pr_debug("%s", buf);
c66ac9db
NB		 929
930 return ret;
931}
932
933int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
934{
935 /*
936 * The VPD identification association..
937 *
938 * from spc3r23.pdf Section 7.6.3.1 Table 297
939 */
940 vpd->association = (page_83[1] & 0x30);
941 return transport_dump_vpd_assoc(vpd, NULL, 0);
942}
943EXPORT_SYMBOL(transport_set_vpd_assoc);
944
945int transport_dump_vpd_ident_type(
946 struct t10_vpd *vpd,
947 unsigned char *p_buf,
948 int p_buf_len)
949{
950 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 951 int ret = 0;
952 int len;
c66ac9db
NB		 953
954 memset(buf, 0, VPD_TMP_BUF_SIZE);
955 len = sprintf(buf, "T10 VPD Identifier Type: ");
956
957 switch (vpd->device_identifier_type) {
958 case 0x00:
959 sprintf(buf+len, "Vendor specific\n");
960 break;
961 case 0x01:
962 sprintf(buf+len, "T10 Vendor ID based\n");
963 break;
964 case 0x02:
965 sprintf(buf+len, "EUI-64 based\n");
966 break;
967 case 0x03:
968 sprintf(buf+len, "NAA\n");
969 break;
970 case 0x04:
971 sprintf(buf+len, "Relative target port identifier\n");
972 break;
973 case 0x08:
974 sprintf(buf+len, "SCSI name string\n");
975 break;
976 default:
977 sprintf(buf+len, "Unsupported: 0x%02x\n",
978 vpd->device_identifier_type);
e3d6f909 979 ret = -EINVAL;
c66ac9db
NB		 980 break;
981 }
982
e3d6f909
AG		 983 if (p_buf) {
984 if (p_buf_len < strlen(buf)+1)
985 return -EINVAL;
c66ac9db 986 strncpy(p_buf, buf, p_buf_len);
e3d6f909 987 } else {
6708bb27 988 pr_debug("%s", buf);
e3d6f909 989 }
c66ac9db
NB		 990
991 return ret;
992}
993
994int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
995{
996 /*
997 * The VPD identifier type..
998 *
999 * from spc3r23.pdf Section 7.6.3.1 Table 298
1000 */
1001 vpd->device_identifier_type = (page_83[1] & 0x0f);
1002 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1003}
1004EXPORT_SYMBOL(transport_set_vpd_ident_type);
1005
1006int transport_dump_vpd_ident(
1007 struct t10_vpd *vpd,
1008 unsigned char *p_buf,
1009 int p_buf_len)
1010{
1011 unsigned char buf[VPD_TMP_BUF_SIZE];
1012 int ret = 0;
1013
1014 memset(buf, 0, VPD_TMP_BUF_SIZE);
1015
1016 switch (vpd->device_identifier_code_set) {
1017 case 0x01: /* Binary */
703d641d
DC		 1018 snprintf(buf, sizeof(buf),
1019 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1020 &vpd->device_identifier[0]);
1021 break;
1022 case 0x02: /* ASCII */
703d641d
DC		 1023 snprintf(buf, sizeof(buf),
1024 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1025 &vpd->device_identifier[0]);
1026 break;
1027 case 0x03: /* UTF-8 */
703d641d
DC		 1028 snprintf(buf, sizeof(buf),
1029 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1030 &vpd->device_identifier[0]);
1031 break;
1032 default:
1033 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1034 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1035 ret = -EINVAL;
c66ac9db
NB		 1036 break;
1037 }
1038
1039 if (p_buf)
1040 strncpy(p_buf, buf, p_buf_len);
1041 else
6708bb27 1042 pr_debug("%s", buf);
c66ac9db
NB		 1043
1044 return ret;
1045}
1046
1047int
1048transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1049{
1050 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1051 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1052
1053 /*
1054 * The VPD Code Set (encoding)
1055 *
1056 * from spc3r23.pdf Section 7.6.3.1 Table 296
1057 */
1058 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1059 switch (vpd->device_identifier_code_set) {
1060 case 0x01: /* Binary */
1061 vpd->device_identifier[j++] =
1062 hex_str[vpd->device_identifier_type];
1063 while (i < (4 + page_83[3])) {
1064 vpd->device_identifier[j++] =
1065 hex_str[(page_83[i] & 0xf0) >> 4];
1066 vpd->device_identifier[j++] =
1067 hex_str[page_83[i] & 0x0f];
1068 i++;
1069 }
1070 break;
1071 case 0x02: /* ASCII */
1072 case 0x03: /* UTF-8 */
1073 while (i < (4 + page_83[3]))
1074 vpd->device_identifier[j++] = page_83[i++];
1075 break;
1076 default:
1077 break;
1078 }
1079
1080 return transport_dump_vpd_ident(vpd, NULL, 0);
1081}
1082EXPORT_SYMBOL(transport_set_vpd_ident);
1083
de103c93
CH		 1084sense_reason_t
1085target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1086{
1087 struct se_device *dev = cmd->se_dev;
1088
1089 if (cmd->unknown_data_length) {
1090 cmd->data_length = size;
1091 } else if (size != cmd->data_length) {
1092 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1093 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1094 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1095 cmd->data_length, size, cmd->t_task_cdb[0]);
1096
9b3b8041
CH		 1097 if (cmd->data_direction == DMA_TO_DEVICE) {
1098 pr_err("Rejecting underflow/overflow"
1099 " WRITE data\n");
de103c93 1100 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1101 }
1102 /*
1103 * Reject READ_* or WRITE_* with overflow/underflow for
1104 * type SCF_SCSI_DATA_CDB.
1105 */
0fd97ccf 1106 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1107 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1108 " CDB on non 512-byte sector setup subsystem"
1109 " plugin: %s\n", dev->transport->name);
1110 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1111 return TCM_INVALID_CDB_FIELD;
9b3b8041 1112 }
4c054ba6
NB		 1113 /*
1114 * For the overflow case keep the existing fabric provided
1115 * ->data_length. Otherwise for the underflow case, reset
1116 * ->data_length to the smaller SCSI expected data transfer
1117 * length.
1118 */
9b3b8041
CH		 1119 if (size > cmd->data_length) {
1120 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1121 cmd->residual_count = (size - cmd->data_length);
1122 } else {
1123 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1124 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1125 cmd->data_length = size;
9b3b8041 1126 }
9b3b8041
CH		 1127 }
1128
1129 return 0;
1130
9b3b8041
CH		 1131}
1132
c66ac9db
NB		 1133/*
1134 * Used by fabric modules containing a local struct se_cmd within their
1135 * fabric dependent per I/O descriptor.
649ee054
BVA		 1136 *
1137 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1138 */
1139void transport_init_se_cmd(
1140 struct se_cmd *cmd,
9ac8928e 1141 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1142 struct se_session *se_sess,
1143 u32 data_length,
1144 int data_direction,
1145 int task_attr,
1146 unsigned char *sense_buffer)
1147{
5951146d 1148 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1149 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1150 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1151 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1152 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1153 init_completion(&cmd->cmd_wait_comp);
cf572a96 1154 init_completion(&cmd->task_stop_comp);
a1d8b49a 1155 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1156 kref_init(&cmd->cmd_kref);
7d680f3b 1157 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1158
1159 cmd->se_tfo = tfo;
1160 cmd->se_sess = se_sess;
1161 cmd->data_length = data_length;
1162 cmd->data_direction = data_direction;
1163 cmd->sam_task_attr = task_attr;
1164 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1165
1166 cmd->state_active = false;
c66ac9db
NB		 1167}
1168EXPORT_SYMBOL(transport_init_se_cmd);
1169
de103c93
CH		 1170static sense_reason_t
1171transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1172{
019c4ca6
CH		 1173 struct se_device *dev = cmd->se_dev;
1174
c66ac9db
NB		 1175 /*
1176 * Check if SAM Task Attribute emulation is enabled for this
1177 * struct se_device storage object
1178 */
a3541703 1179 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1180 return 0;
1181
68d81f40 1182 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1183 pr_debug("SAM Task Attribute ACA"
c66ac9db 1184 " emulation is not supported\n");
de103c93 1185 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1186 }
1187 /*
1188 * Used to determine when ORDERED commands should go from
1189 * Dormant to Active status.
1190 */
019c4ca6 1191 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
6708bb27 1192 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1193 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1194 dev->transport->name);
c66ac9db
NB		 1195 return 0;
1196}
1197
de103c93
CH		 1198sense_reason_t
1199target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1200{
0fd97ccf 1201 struct se_device *dev = cmd->se_dev;
de103c93 1202 sense_reason_t ret;
c66ac9db 1203
c66ac9db
NB		 1204 /*
1205 * Ensure that the received CDB is less than the max (252 + 8) bytes
1206 * for VARIABLE_LENGTH_CMD
1207 */
1208 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1209 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1210 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1211 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1212 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1213 }
1214 /*
1215 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1216 * allocate the additional extended CDB buffer now.. Otherwise
1217 * setup the pointer from __t_task_cdb to t_task_cdb.
1218 */
a1d8b49a
AG		 1219 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1220 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1221 GFP_KERNEL);
6708bb27
AG		 1222 if (!cmd->t_task_cdb) {
1223 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1224 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1225 scsi_command_size(cdb),
a1d8b49a 1226 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1227 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1228 }
1229 } else
a1d8b49a 1230 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1231 /*
a1d8b49a 1232 * Copy the original CDB into cmd->
c66ac9db 1233 */
a1d8b49a 1234 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1235
e5c0d6ad
RD		 1236 trace_target_sequencer_start(cmd);
1237
cb4f4d3c
CH		 1238 /*
1239 * Check for an existing UNIT ATTENTION condition
1240 */
de103c93
CH		 1241 ret = target_scsi3_ua_check(cmd);
1242 if (ret)
1243 return ret;
cb4f4d3c 1244
c87fbd56 1245 ret = target_alua_state_check(cmd);
de103c93
CH		 1246 if (ret)
1247 return ret;
cb4f4d3c 1248
d977f437 1249 ret = target_check_reservation(cmd);
f85eda8d
NB		 1250 if (ret) {
1251 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1252 return ret;
f85eda8d 1253 }
cb4f4d3c 1254
0fd97ccf 1255 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1256 if (ret)
1257 return ret;
1258
1259 ret = transport_check_alloc_task_attr(cmd);
1260 if (ret)
c66ac9db 1261 return ret;
cb4f4d3c 1262
cb4f4d3c 1263 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1264
c66ac9db 1265 spin_lock(&cmd->se_lun->lun_sep_lock);
adf653f9 1266 cmd->se_lun->lun_stats.cmd_pdus++;
c66ac9db
NB		 1267 spin_unlock(&cmd->se_lun->lun_sep_lock);
1268 return 0;
1269}
a12f41f8 1270EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1271
695434e1
NB		 1272/*
1273 * Used by fabric module frontends to queue tasks directly.
1274 * Many only be used from process context only
1275 */
1276int transport_handle_cdb_direct(
1277 struct se_cmd *cmd)
1278{
de103c93 1279 sense_reason_t ret;
dd8ae59d 1280
695434e1
NB		 1281 if (!cmd->se_lun) {
1282 dump_stack();
6708bb27 1283 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1284 return -EINVAL;
1285 }
1286 if (in_interrupt()) {
1287 dump_stack();
6708bb27 1288 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1289 " from interrupt context\n");
1290 return -EINVAL;
1291 }
dd8ae59d 1292 /*
af877292
CH		 1293 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1294 * outstanding descriptors are handled correctly during shutdown via
1295 * transport_wait_for_tasks()
dd8ae59d
NB		 1296 *
1297 * Also, we don't take cmd->t_state_lock here as we only expect
1298 * this to be called for initial descriptor submission.
1299 */
1300 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1301 cmd->transport_state |= CMD_T_ACTIVE;
1302
dd8ae59d
NB		 1303 /*
1304 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1305 * so follow TRANSPORT_NEW_CMD processing thread context usage
1306 * and call transport_generic_request_failure() if necessary..
1307 */
1308 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1309 if (ret)
1310 transport_generic_request_failure(cmd, ret);
dd8ae59d 1311 return 0;
695434e1
NB		 1312}
1313EXPORT_SYMBOL(transport_handle_cdb_direct);
1314
c5ff8d6b 1315sense_reason_t
de103c93
CH		 1316transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1317 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1318{
1319 if (!sgl || !sgl_count)
1320 return 0;
1321
1322 /*
1323 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1324 * scatterlists already have been set to follow what the fabric
1325 * passes for the original expected data transfer length.
1326 */
1327 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1328 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1329 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1330 return TCM_INVALID_CDB_FIELD;
1331 }
1332
1333 cmd->t_data_sg = sgl;
1334 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1335 cmd->t_bidi_data_sg = sgl_bidi;
1336 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1337
de103c93
CH		 1338 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1339 return 0;
1340}
1341
a026757f
NB		 1342/*
1343 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1344 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1345 *
1346 * @se_cmd: command descriptor to submit
1347 * @se_sess: associated se_sess for endpoint
1348 * @cdb: pointer to SCSI CDB
1349 * @sense: pointer to SCSI sense buffer
1350 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1351 * @data_length: fabric expected data transfer length
1352 * @task_addr: SAM task attribute
1353 * @data_dir: DMA data direction
1354 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1355 * @sgl: struct scatterlist memory for unidirectional mapping
1356 * @sgl_count: scatterlist count for unidirectional mapping
1357 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1358 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1359 * @sgl_prot: struct scatterlist memory protection information
1360 * @sgl_prot_count: scatterlist count for protection information
a6360785 1361 *
649ee054
BVA		 1362 * Task tags are supported if the caller has set @se_cmd->tag.
1363 *
d6dfc868
RD		 1364 * Returns non zero to signal active I/O shutdown failure. All other
1365 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1366 * but still return zero here.
1367 *
a6360785
NB		 1368 * This may only be called from process context, and also currently
1369 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1370 */
1371int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1372 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1373 u32 data_length, int task_attr, int data_dir, int flags,
1374 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1375 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1376 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1377{
1378 struct se_portal_group *se_tpg;
de103c93
CH		 1379 sense_reason_t rc;
1380 int ret;
a6360785
NB		 1381
1382 se_tpg = se_sess->se_tpg;
1383 BUG_ON(!se_tpg);
1384 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1385 BUG_ON(in_interrupt());
1386 /*
1387 * Initialize se_cmd for target operation. From this point
1388 * exceptions are handled by sending exception status via
1389 * target_core_fabric_ops->queue_status() callback
1390 */
1391 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1392 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1393 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1394 se_cmd->unknown_data_length = 1;
a6360785
NB		 1395 /*
1396 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1397 * se_sess->sess_cmd_list. A second kref_get here is necessary
1398 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1399 * kref_put() to happen during fabric packet acknowledgement.
1400 */
afc16604 1401 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1402 if (ret)
1403 return ret;
a6360785
NB		 1404 /*
1405 * Signal bidirectional data payloads to target-core
1406 */
1407 if (flags & TARGET_SCF_BIDI_OP)
1408 se_cmd->se_cmd_flags |= SCF_BIDI;
1409 /*
1410 * Locate se_lun pointer and attach it to struct se_cmd
1411 */
de103c93
CH		 1412 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1413 if (rc) {
1414 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1415 target_put_sess_cmd(se_cmd);
d6dfc868 1416 return 0;
735703ca 1417 }
b5b8e298
SG		 1418
1419 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1420 if (rc != 0) {
1421 transport_generic_request_failure(se_cmd, rc);
1422 return 0;
1423 }
1424
def2b339
NB		 1425 /*
1426 * Save pointers for SGLs containing protection information,
1427 * if present.
1428 */
1429 if (sgl_prot_count) {
1430 se_cmd->t_prot_sg = sgl_prot;
1431 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1432 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1433 }
d6e0175c 1434
a026757f
NB		 1435 /*
1436 * When a non zero sgl_count has been passed perform SGL passthrough
1437 * mapping for pre-allocated fabric memory instead of having target
1438 * core perform an internal SGL allocation..
1439 */
1440 if (sgl_count != 0) {
1441 BUG_ON(!sgl);
1442
944981c7
NB		 1443 /*
1444 * A work-around for tcm_loop as some userspace code via
1445 * scsi-generic do not memset their associated read buffers,
1446 * so go ahead and do that here for type non-data CDBs. Also
1447 * note that this is currently guaranteed to be a single SGL
1448 * for this case by target core in target_setup_cmd_from_cdb()
1449 * -> transport_generic_cmd_sequencer().
1450 */
1451 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1452 se_cmd->data_direction == DMA_FROM_DEVICE) {
1453 unsigned char *buf = NULL;
1454
1455 if (sgl)
1456 buf = kmap(sg_page(sgl)) + sgl->offset;
1457
1458 if (buf) {
1459 memset(buf, 0, sgl->length);
1460 kunmap(sg_page(sgl));
1461 }
1462 }
1463
a026757f
NB		 1464 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1465 sgl_bidi, sgl_bidi_count);
1466 if (rc != 0) {
de103c93 1467 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1468 return 0;
1469 }
1470 }
def2b339 1471
11e319ed
AG		 1472 /*
1473 * Check if we need to delay processing because of ALUA
1474 * Active/NonOptimized primary access state..
1475 */
1476 core_alua_check_nonop_delay(se_cmd);
1477
a6360785 1478 transport_handle_cdb_direct(se_cmd);
d6dfc868 1479 return 0;
a6360785 1480}
a026757f
NB		 1481EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1482
1483/*
1484 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1485 *
1486 * @se_cmd: command descriptor to submit
1487 * @se_sess: associated se_sess for endpoint
1488 * @cdb: pointer to SCSI CDB
1489 * @sense: pointer to SCSI sense buffer
1490 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1491 * @data_length: fabric expected data transfer length
1492 * @task_addr: SAM task attribute
1493 * @data_dir: DMA data direction
1494 * @flags: flags for command submission from target_sc_flags_tables
1495 *
649ee054
BVA		 1496 * Task tags are supported if the caller has set @se_cmd->tag.
1497 *
a026757f
NB		 1498 * Returns non zero to signal active I/O shutdown failure. All other
1499 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1500 * but still return zero here.
1501 *
1502 * This may only be called from process context, and also currently
1503 * assumes internal allocation of fabric payload buffer by target-core.
1504 *
1505 * It also assumes interal target core SGL memory allocation.
1506 */
1507int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1508 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1509 u32 data_length, int task_attr, int data_dir, int flags)
1510{
1511 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1512 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1513 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1514}
a6360785
NB		 1515EXPORT_SYMBOL(target_submit_cmd);
1516
9f0d05c2
NB		 1517static void target_complete_tmr_failure(struct work_struct *work)
1518{
1519 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1520
1521 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1522 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1523
1524 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1525}
1526
ea98d7f9
AG		 1527/**
1528 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1529 * for TMR CDBs
1530 *
1531 * @se_cmd: command descriptor to submit
1532 * @se_sess: associated se_sess for endpoint
1533 * @sense: pointer to SCSI sense buffer
1534 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1535 * @fabric_context: fabric context for TMR req
1536 * @tm_type: Type of TM request
c0974f89
NB		 1537 * @gfp: gfp type for caller
1538 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1539 * @flags: submit cmd flags
ea98d7f9
AG		 1540 *
1541 * Callable from all contexts.
1542 **/
1543
c7042cae 1544int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1545 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1546 void *fabric_tmr_ptr, unsigned char tm_type,
1547 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1548{
1549 struct se_portal_group *se_tpg;
1550 int ret;
1551
1552 se_tpg = se_sess->se_tpg;
1553 BUG_ON(!se_tpg);
1554
1555 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1556 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1557 /*
1558 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1559 * allocation failure.
1560 */
c0974f89 1561 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1562 if (ret < 0)
1563 return -ENOMEM;
ea98d7f9 1564
c0974f89
NB		 1565 if (tm_type == TMR_ABORT_TASK)
1566 se_cmd->se_tmr_req->ref_task_tag = tag;
1567
ea98d7f9 1568 /* See target_submit_cmd for commentary */
afc16604 1569 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1570 if (ret) {
1571 core_tmr_release_req(se_cmd->se_tmr_req);
1572 return ret;
1573 }
ea98d7f9 1574
ea98d7f9
AG		 1575 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1576 if (ret) {
9f0d05c2
NB		 1577 /*
1578 * For callback during failure handling, push this work off
1579 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1580 */
1581 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1582 schedule_work(&se_cmd->work);
c7042cae 1583 return 0;
ea98d7f9
AG		 1584 }
1585 transport_generic_handle_tmr(se_cmd);
c7042cae 1586 return 0;
ea98d7f9
AG		 1587}
1588EXPORT_SYMBOL(target_submit_tmr);
1589
cdbb70bb 1590/*
cf572a96 1591 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1592 * has completed.
1593 */
cf572a96 1594bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cb0df4d3
BVA		 1595 __releases(&cmd->t_state_lock)
1596 __acquires(&cmd->t_state_lock)
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
649ee054
BVA		 1625 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1626 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1627 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1628 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1629 cmd->t_state, sense_reason);
d43d6aea 1630 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1631 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1632 (cmd->transport_state & CMD_T_STOP) != 0,
1633 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1634
c66ac9db
NB		 1635 /*
1636 * For SAM Task Attribute emulation for failed struct se_cmd
1637 */
019c4ca6 1638 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1639 /*
1640 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1641 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1642 */
1643 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1644 cmd->transport_complete_callback)
c8e63985 1645 cmd->transport_complete_callback(cmd, false);
c66ac9db 1646
de103c93 1647 switch (sense_reason) {
03e98c9e
NB		 1648 case TCM_NON_EXISTENT_LUN:
1649 case TCM_UNSUPPORTED_SCSI_OPCODE:
1650 case TCM_INVALID_CDB_FIELD:
1651 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1652 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1653 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1654 case TCM_UNKNOWN_MODE_PAGE:
1655 case TCM_WRITE_PROTECTED:
e2397c70 1656 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1657 case TCM_CHECK_CONDITION_ABORT_CMD:
1658 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1659 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1660 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1661 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1662 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1663 break;
de103c93
CH		 1664 case TCM_OUT_OF_RESOURCES:
1665 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1666 break;
03e98c9e 1667 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1668 /*
1669 * No SENSE Data payload for this case, set SCSI Status
1670 * and queue the response to $FABRIC_MOD.
1671 *
1672 * Uses linux/include/scsi/scsi.h SAM status codes defs
1673 */
1674 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1675 /*
1676 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1677 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1678 * CONFLICT STATUS.
1679 *
1680 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1681 */
e3d6f909 1682 if (cmd->se_sess &&
0fd97ccf 1683 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1684 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1685 cmd->orig_fe_lun, 0x2C,
1686 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1687
e5c0d6ad
RD		 1688 trace_target_cmd_complete(cmd);
1689 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1690 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1691 goto queue_full;
c66ac9db 1692 goto check_stop;
c66ac9db 1693 default:
6708bb27 1694 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1695 cmd->t_task_cdb[0], sense_reason);
1696 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1697 break;
1698 }
f3146437 1699
de103c93 1700 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1701 if (ret == -EAGAIN || ret == -ENOMEM)
1702 goto queue_full;
07bde79a 1703
c66ac9db
NB		 1704check_stop:
1705 transport_lun_remove_cmd(cmd);
6708bb27 1706 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1707 ;
07bde79a
NB		 1708 return;
1709
1710queue_full:
e057f533
CH		 1711 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1712 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1713}
2fbff127 1714EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1715
76dde50e 1716void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1717{
de103c93 1718 sense_reason_t ret;
5f41a31d 1719
de103c93
CH		 1720 if (cmd->execute_cmd) {
1721 ret = cmd->execute_cmd(cmd);
1722 if (ret) {
1723 spin_lock_irq(&cmd->t_state_lock);
1724 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1725 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1726
de103c93
CH		 1727 transport_generic_request_failure(cmd, ret);
1728 }
5f41a31d
CH		 1729 }
1730}
1731
aa58b531
NB		 1732static int target_write_prot_action(struct se_cmd *cmd)
1733{
5132d1e6 1734 u32 sectors;
aa58b531
NB		 1735 /*
1736 * Perform WRITE_INSERT of PI using software emulation when backend
1737 * device has PI enabled, if the transport has not already generated
1738 * PI using hardware WRITE_INSERT offload.
1739 */
1740 switch (cmd->prot_op) {
1741 case TARGET_PROT_DOUT_INSERT:
1742 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1743 sbc_dif_generate(cmd);
1744 break;
5132d1e6
NB		 1745 case TARGET_PROT_DOUT_STRIP:
1746 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1747 break;
1748
1749 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1750 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1751 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1752 if (unlikely(cmd->pi_err)) {
1753 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1754 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1755 spin_unlock_irq(&cmd->t_state_lock);
1756 transport_generic_request_failure(cmd, cmd->pi_err);
1757 return -1;
1758 }
1759 break;
aa58b531
NB		 1760 default:
1761 break;
1762 }
1763
1764 return 0;
1765}
1766
019c4ca6 1767static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1768{
1769 struct se_device *dev = cmd->se_dev;
1770
a3541703 1771 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1772 return false;
5f41a31d 1773
c66ac9db 1774 /*
25985edc 1775 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1776 * to allow the passed struct se_cmd list of tasks to the front of the list.
1777 */
5f41a31d 1778 switch (cmd->sam_task_attr) {
68d81f40 1779 case TCM_HEAD_TAG:
5f41a31d
CH		 1780 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1781 "se_ordered_id: %u\n",
1782 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1783 return false;
68d81f40 1784 case TCM_ORDERED_TAG:
33940d09 1785 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1786
5f41a31d
CH		 1787 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1788 " se_ordered_id: %u\n",
1789 cmd->t_task_cdb[0], cmd->se_ordered_id);
1790
c66ac9db 1791 /*
5f41a31d
CH		 1792 * Execute an ORDERED command if no other older commands
1793 * exist that need to be completed first.
c66ac9db 1794 */
5f41a31d 1795 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1796 return false;
5f41a31d
CH		 1797 break;
1798 default:
c66ac9db
NB		 1799 /*
1800 * For SIMPLE and UNTAGGED Task Attribute commands
1801 */
33940d09 1802 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1803 break;
c66ac9db 1804 }
5f41a31d 1805
019c4ca6
CH		 1806 if (atomic_read(&dev->dev_ordered_sync) == 0)
1807 return false;
c66ac9db 1808
019c4ca6
CH		 1809 spin_lock(&dev->delayed_cmd_lock);
1810 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1811 spin_unlock(&dev->delayed_cmd_lock);
1812
1813 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1814 " delayed CMD list, se_ordered_id: %u\n",
1815 cmd->t_task_cdb[0], cmd->sam_task_attr,
1816 cmd->se_ordered_id);
1817 return true;
1818}
1819
1820void target_execute_cmd(struct se_cmd *cmd)
1821{
1822 /*
1823 * If the received CDB has aleady been aborted stop processing it here.
1824 */
4a9a6c8d 1825 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1826 return;
c66ac9db 1827
019c4ca6
CH		 1828 /*
1829 * Determine if frontend context caller is requesting the stopping of
1830 * this command for frontend exceptions.
1831 */
4a9a6c8d 1832 spin_lock_irq(&cmd->t_state_lock);
019c4ca6 1833 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1834 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1835 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1836
1837 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1838 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1839 return;
1840 }
1841
1842 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1843 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1844 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1845
1846 if (target_write_prot_action(cmd))
1847 return;
019c4ca6 1848
1a398b97
NB		 1849 if (target_handle_task_attr(cmd)) {
1850 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1851 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1852 spin_unlock_irq(&cmd->t_state_lock);
1853 return;
1854 }
1855
1856 __target_execute_cmd(cmd);
c66ac9db 1857}
70baf0ab 1858EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1859
5f41a31d
CH		 1860/*
1861 * Process all commands up to the last received ORDERED task attribute which
1862 * requires another blocking boundary
1863 */
1864static void target_restart_delayed_cmds(struct se_device *dev)
1865{
1866 for (;;) {
1867 struct se_cmd *cmd;
1868
1869 spin_lock(&dev->delayed_cmd_lock);
1870 if (list_empty(&dev->delayed_cmd_list)) {
1871 spin_unlock(&dev->delayed_cmd_lock);
1872 break;
1873 }
1874
1875 cmd = list_entry(dev->delayed_cmd_list.next,
1876 struct se_cmd, se_delayed_node);
1877 list_del(&cmd->se_delayed_node);
1878 spin_unlock(&dev->delayed_cmd_lock);
1879
1880 __target_execute_cmd(cmd);
1881
68d81f40 1882 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1883 break;
1884 }
1885}
1886
c66ac9db 1887/*
35e0e757 1888 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1889 * and ordered cmds need to have their tasks added to the execution queue.
1890 */
1891static void transport_complete_task_attr(struct se_cmd *cmd)
1892{
5951146d 1893 struct se_device *dev = cmd->se_dev;
c66ac9db 1894
a3541703 1895 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1896 return;
1897
68d81f40 1898 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1899 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1900 dev->dev_cur_ordered_id++;
6708bb27 1901 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1902 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1903 cmd->se_ordered_id);
68d81f40 1904 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1905 dev->dev_cur_ordered_id++;
6708bb27 1906 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1907 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1908 cmd->se_ordered_id);
68d81f40 1909 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1910 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1911
1912 dev->dev_cur_ordered_id++;
6708bb27 1913 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1914 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1915 }
c66ac9db 1916
5f41a31d 1917 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1918}
1919
e057f533 1920static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1921{
1922 int ret = 0;
1923
019c4ca6 1924 transport_complete_task_attr(cmd);
e057f533
CH		 1925
1926 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1927 trace_target_cmd_complete(cmd);
e057f533 1928 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1929 goto out;
e057f533 1930 }
07bde79a
NB		 1931
1932 switch (cmd->data_direction) {
1933 case DMA_FROM_DEVICE:
e5c0d6ad 1934 trace_target_cmd_complete(cmd);
07bde79a
NB		 1935 ret = cmd->se_tfo->queue_data_in(cmd);
1936 break;
1937 case DMA_TO_DEVICE:
64577407 1938 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1939 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1940 break;
07bde79a
NB		 1941 }
1942 /* Fall through for DMA_TO_DEVICE */
1943 case DMA_NONE:
e5c0d6ad 1944 trace_target_cmd_complete(cmd);
07bde79a
NB		 1945 ret = cmd->se_tfo->queue_status(cmd);
1946 break;
1947 default:
1948 break;
1949 }
1950
e057f533
CH		 1951out:
1952 if (ret < 0) {
1953 transport_handle_queue_full(cmd, cmd->se_dev);
1954 return;
1955 }
1956 transport_lun_remove_cmd(cmd);
1957 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1958}
1959
1960static void transport_handle_queue_full(
1961 struct se_cmd *cmd,
e057f533 1962 struct se_device *dev)
07bde79a
NB		 1963{
1964 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 1965 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 1966 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 1967 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1968
1969 schedule_work(&cmd->se_dev->qf_work_queue);
1970}
1971
fdeab852 1972static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 1973{
fdeab852
NB		 1974 switch (cmd->prot_op) {
1975 case TARGET_PROT_DIN_STRIP:
1976 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 1977 u32 sectors = cmd->data_length >>
1978 ilog2(cmd->se_dev->dev_attrib.block_size);
1979
1980 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1981 sectors, 0, cmd->t_prot_sg,
1982 0);
1983 if (cmd->pi_err)
fdeab852 1984 return true;
bc005869 1985 }
fdeab852 1986 break;
72c03850
NB		 1987 case TARGET_PROT_DIN_INSERT:
1988 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
1989 break;
1990
1991 sbc_dif_generate(cmd);
1992 break;
fdeab852
NB		 1993 default:
1994 break;
bc005869
NB		 1995 }
1996
1997 return false;
1998}
1999
35e0e757 2000static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2001{
35e0e757 2002 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2003 int ret;
35e0e757 2004
c66ac9db
NB		 2005 /*
2006 * Check if we need to move delayed/dormant tasks from cmds on the
2007 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2008 * Attribute.
2009 */
019c4ca6
CH		 2010 transport_complete_task_attr(cmd);
2011
07bde79a
NB		 2012 /*
2013 * Check to schedule QUEUE_FULL work, or execute an existing
2014 * cmd->transport_qf_callback()
2015 */
2016 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2017 schedule_work(&cmd->se_dev->qf_work_queue);
2018
c66ac9db 2019 /*
d5829eac 2020 * Check if we need to send a sense buffer from
c66ac9db
NB		 2021 * the struct se_cmd in question.
2022 */
2023 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2024 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2025 ret = transport_send_check_condition_and_sense(
2026 cmd, 0, 1);
2027 if (ret == -EAGAIN || ret == -ENOMEM)
2028 goto queue_full;
2029
2030 transport_lun_remove_cmd(cmd);
2031 transport_cmd_check_stop_to_fabric(cmd);
2032 return;
c66ac9db
NB		 2033 }
2034 /*
25985edc 2035 * Check for a callback, used by amongst other things
a6b0133c 2036 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2037 */
a6b0133c
NB		 2038 if (cmd->transport_complete_callback) {
2039 sense_reason_t rc;
2040
c8e63985 2041 rc = cmd->transport_complete_callback(cmd, true);
a2890087 2042 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
c8e63985
NB		 2043 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2044 !cmd->data_length)
2045 goto queue_rsp;
2046
a6b0133c 2047 return;
a2890087
NB		 2048 } else if (rc) {
2049 ret = transport_send_check_condition_and_sense(cmd,
2050 rc, 0);
2051 if (ret == -EAGAIN || ret == -ENOMEM)
2052 goto queue_full;
a6b0133c 2053
a2890087
NB		 2054 transport_lun_remove_cmd(cmd);
2055 transport_cmd_check_stop_to_fabric(cmd);
2056 return;
2057 }
a6b0133c 2058 }
c66ac9db 2059
c8e63985 2060queue_rsp:
c66ac9db
NB		 2061 switch (cmd->data_direction) {
2062 case DMA_FROM_DEVICE:
2063 spin_lock(&cmd->se_lun->lun_sep_lock);
adf653f9 2064 cmd->se_lun->lun_stats.tx_data_octets += cmd->data_length;
c66ac9db 2065 spin_unlock(&cmd->se_lun->lun_sep_lock);
bc005869
NB		 2066 /*
2067 * Perform READ_STRIP of PI using software emulation when
2068 * backend had PI enabled, if the transport will not be
2069 * performing hardware READ_STRIP offload.
2070 */
fdeab852 2071 if (target_read_prot_action(cmd)) {
bc005869
NB		 2072 ret = transport_send_check_condition_and_sense(cmd,
2073 cmd->pi_err, 0);
2074 if (ret == -EAGAIN || ret == -ENOMEM)
2075 goto queue_full;
2076
2077 transport_lun_remove_cmd(cmd);
2078 transport_cmd_check_stop_to_fabric(cmd);
2079 return;
2080 }
c66ac9db 2081
e5c0d6ad 2082 trace_target_cmd_complete(cmd);
07bde79a 2083 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2084 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2085 goto queue_full;
c66ac9db
NB		 2086 break;
2087 case DMA_TO_DEVICE:
2088 spin_lock(&cmd->se_lun->lun_sep_lock);
adf653f9 2089 cmd->se_lun->lun_stats.rx_data_octets += cmd->data_length;
c66ac9db
NB		 2090 spin_unlock(&cmd->se_lun->lun_sep_lock);
2091 /*
2092 * Check if we need to send READ payload for BIDI-COMMAND
2093 */
64577407 2094 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 2095 spin_lock(&cmd->se_lun->lun_sep_lock);
adf653f9 2096 cmd->se_lun->lun_stats.tx_data_octets += cmd->data_length;
c66ac9db 2097 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2098 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2099 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2100 goto queue_full;
c66ac9db
NB		 2101 break;
2102 }
2103 /* Fall through for DMA_TO_DEVICE */
2104 case DMA_NONE:
e5c0d6ad 2105 trace_target_cmd_complete(cmd);
07bde79a 2106 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2107 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2108 goto queue_full;
c66ac9db
NB		 2109 break;
2110 default:
2111 break;
2112 }
2113
2114 transport_lun_remove_cmd(cmd);
2115 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2116 return;
2117
2118queue_full:
6708bb27 2119 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2120 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2121 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2122 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2123}
2124
6708bb27 2125static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2126{
ec98f782 2127 struct scatterlist *sg;
ec98f782 2128 int count;
c66ac9db 2129
6708bb27
AG		 2130 for_each_sg(sgl, sg, nents, count)
2131 __free_page(sg_page(sg));
c66ac9db 2132
6708bb27
AG		 2133 kfree(sgl);
2134}
c66ac9db 2135
47e459e6
NB		 2136static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2137{
2138 /*
2139 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2140 * emulation, and free + reset pointers if necessary..
2141 */
2142 if (!cmd->t_data_sg_orig)
2143 return;
2144
2145 kfree(cmd->t_data_sg);
2146 cmd->t_data_sg = cmd->t_data_sg_orig;
2147 cmd->t_data_sg_orig = NULL;
2148 cmd->t_data_nents = cmd->t_data_nents_orig;
2149 cmd->t_data_nents_orig = 0;
2150}
2151
6708bb27
AG		 2152static inline void transport_free_pages(struct se_cmd *cmd)
2153{
5835812f
AM		 2154 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2155 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2156 cmd->t_prot_sg = NULL;
2157 cmd->t_prot_nents = 0;
2158 }
2159
47e459e6 2160 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2161 /*
2162 * Release special case READ buffer payload required for
2163 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2164 */
2165 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2166 transport_free_sgl(cmd->t_bidi_data_sg,
2167 cmd->t_bidi_data_nents);
2168 cmd->t_bidi_data_sg = NULL;
2169 cmd->t_bidi_data_nents = 0;
2170 }
47e459e6 2171 transport_reset_sgl_orig(cmd);
6708bb27 2172 return;
47e459e6
NB		 2173 }
2174 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2175
2176 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2177 cmd->t_data_sg = NULL;
2178 cmd->t_data_nents = 0;
c66ac9db 2179
6708bb27 2180 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2181 cmd->t_bidi_data_sg = NULL;
2182 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2183}
2184
e26d99ae
CH		 2185/**
2186 * transport_release_cmd - free a command
2187 * @cmd: command to free
2188 *
2189 * This routine unconditionally frees a command, and reference counting
2190 * or list removal must be done in the caller.
2191 */
d5ddad41 2192static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2193{
2194 BUG_ON(!cmd->se_tfo);
2195
c8e31f26 2196 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2197 core_tmr_release_req(cmd->se_tmr_req);
2198 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2199 kfree(cmd->t_task_cdb);
2200 /*
7481deb4
NB		 2201 * If this cmd has been setup with target_get_sess_cmd(), drop
2202 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2203 */
afc16604 2204 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2205}
2206
d3df7825
CH		 2207/**
2208 * transport_put_cmd - release a reference to a command
2209 * @cmd: command to release
2210 *
2211 * This routine releases our reference to the command and frees it if possible.
2212 */
d5ddad41 2213static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2214{
c66ac9db 2215 transport_free_pages(cmd);
d5ddad41 2216 return transport_release_cmd(cmd);
c66ac9db 2217}
c66ac9db 2218
4949314c 2219void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2220{
ec98f782 2221 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2222 struct page **pages;
2223 int i;
05d1c7c0
AG		 2224
2225 /*
ec98f782
AG		 2226 * We need to take into account a possible offset here for fabrics like
2227 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2228 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2229 */
4949314c
AG		 2230 if (!cmd->t_data_nents)
2231 return NULL;
3717ef0c
PB		 2232
2233 BUG_ON(!sg);
2234 if (cmd->t_data_nents == 1)
4949314c
AG		 2235 return kmap(sg_page(sg)) + sg->offset;
2236
2237 /* >1 page. use vmap */
2238 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2239 if (!pages)
4949314c
AG		 2240 return NULL;
2241
2242 /* convert sg[] to pages[] */
2243 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2244 pages[i] = sg_page(sg);
2245 }
2246
2247 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2248 kfree(pages);
de103c93 2249 if (!cmd->t_data_vmap)
4949314c
AG		 2250 return NULL;
2251
2252 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2253}
4949314c 2254EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2255
4949314c 2256void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2257{
a1edf9cf 2258 if (!cmd->t_data_nents) {
4949314c 2259 return;
a1edf9cf 2260 } else if (cmd->t_data_nents == 1) {
4949314c 2261 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2262 return;
2263 }
4949314c
AG		 2264
2265 vunmap(cmd->t_data_vmap);
2266 cmd->t_data_vmap = NULL;
05d1c7c0 2267}
4949314c 2268EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2269
c5ff8d6b 2270int
20093994
NB		 2271target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2272 bool zero_page)
c66ac9db 2273{
20093994 2274 struct scatterlist *sg;
ec98f782 2275 struct page *page;
20093994
NB		 2276 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2277 unsigned int nent;
ec98f782 2278 int i = 0;
c66ac9db 2279
20093994
NB		 2280 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2281 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2282 if (!sg)
ec98f782 2283 return -ENOMEM;
c66ac9db 2284
20093994 2285 sg_init_table(sg, nent);
9db9da33 2286
ec98f782
AG		 2287 while (length) {
2288 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2289 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2290 if (!page)
2291 goto out;
c66ac9db 2292
20093994 2293 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2294 length -= page_len;
2295 i++;
c66ac9db 2296 }
20093994
NB		 2297 *sgl = sg;
2298 *nents = nent;
c66ac9db 2299 return 0;
c66ac9db 2300
ec98f782 2301out:
d0e27c88 2302 while (i > 0) {
ec98f782 2303 i--;
20093994 2304 __free_page(sg_page(&sg[i]));
c66ac9db 2305 }
20093994 2306 kfree(sg);
ec98f782 2307 return -ENOMEM;
c66ac9db
NB		 2308}
2309
da0f7619 2310/*
b16a35b0
AG		 2311 * Allocate any required resources to execute the command. For writes we
2312 * might not have the payload yet, so notify the fabric via a call to
2313 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2314 */
de103c93
CH		 2315sense_reason_t
2316transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2317{
c66ac9db 2318 int ret = 0;
c8e63985 2319 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2320
5835812f
AM		 2321 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2322 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2323 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
2324 cmd->prot_length, true);
2325 if (ret < 0)
2326 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2327 }
2328
c66ac9db
NB		 2329 /*
2330 * Determine is the TCM fabric module has already allocated physical
2331 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2332 * beforehand.
c66ac9db 2333 */
ec98f782
AG		 2334 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2335 cmd->data_length) {
20093994 2336
8cefe07b
NB		 2337 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2338 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2339 u32 bidi_length;
2340
2341 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2342 bidi_length = cmd->t_task_nolb *
2343 cmd->se_dev->dev_attrib.block_size;
2344 else
2345 bidi_length = cmd->data_length;
2346
2347 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2348 &cmd->t_bidi_data_nents,
2349 bidi_length, zero_flag);
2350 if (ret < 0)
2351 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2352 }
2353
20093994
NB		 2354 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2355 cmd->data_length, zero_flag);
c66ac9db 2356 if (ret < 0)
de103c93 2357 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2358 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2359 cmd->data_length) {
2360 /*
2361 * Special case for COMPARE_AND_WRITE with fabrics
2362 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2363 */
2364 u32 caw_length = cmd->t_task_nolb *
2365 cmd->se_dev->dev_attrib.block_size;
2366
2367 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2368 &cmd->t_bidi_data_nents,
2369 caw_length, zero_flag);
2370 if (ret < 0)
2371 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2372 }
c66ac9db 2373 /*
c3196f0c
CH		 2374 * If this command is not a write we can execute it right here,
2375 * for write buffers we need to notify the fabric driver first
2376 * and let it call back once the write buffers are ready.
c66ac9db 2377 */
5f41a31d 2378 target_add_to_state_list(cmd);
885e7b0e 2379 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2380 target_execute_cmd(cmd);
2381 return 0;
2382 }
862e6389 2383 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2384
2385 ret = cmd->se_tfo->write_pending(cmd);
2386 if (ret == -EAGAIN || ret == -ENOMEM)
2387 goto queue_full;
2388
de103c93
CH		 2389 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2390 WARN_ON(ret);
2391
b69c1fcf 2392 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2393
c3196f0c
CH		 2394queue_full:
2395 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2396 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2397 transport_handle_queue_full(cmd, cmd->se_dev);
2398 return 0;
c66ac9db 2399}
a1d8b49a 2400EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2401
e057f533 2402static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2403{
f147abb4
NB		 2404 int ret;
2405
2406 ret = cmd->se_tfo->write_pending(cmd);
2407 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2408 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2409 cmd);
2410 transport_handle_queue_full(cmd, cmd->se_dev);
2411 }
07bde79a
NB		 2412}
2413
d5ddad41 2414int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2415{
c130480b 2416 unsigned long flags;
d5ddad41
NB		 2417 int ret = 0;
2418
d14921d6 2419 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2420 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2421 transport_wait_for_tasks(cmd);
2422
d5ddad41 2423 ret = transport_release_cmd(cmd);
d14921d6
NB		 2424 } else {
2425 if (wait_for_tasks)
2426 transport_wait_for_tasks(cmd);
c130480b
NB		 2427 /*
2428 * Handle WRITE failure case where transport_generic_new_cmd()
2429 * has already added se_cmd to state_list, but fabric has
2430 * failed command before I/O submission.
2431 */
2432 if (cmd->state_active) {
2433 spin_lock_irqsave(&cmd->t_state_lock, flags);
2434 target_remove_from_state_list(cmd);
2435 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2436 }
d14921d6 2437
82f1c8a4 2438 if (cmd->se_lun)
c66ac9db 2439 transport_lun_remove_cmd(cmd);
c66ac9db 2440
d5ddad41 2441 ret = transport_put_cmd(cmd);
c66ac9db 2442 }
d5ddad41 2443 return ret;
c66ac9db
NB		 2444}
2445EXPORT_SYMBOL(transport_generic_free_cmd);
2446
a17f091d 2447/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2448 * @se_cmd: command descriptor to add
a6360785 2449 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2450 */
afc16604 2451int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2452{
afc16604 2453 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2454 unsigned long flags;
bc187ea6 2455 int ret = 0;
a17f091d 2456
a6360785
NB		 2457 /*
2458 * Add a second kref if the fabric caller is expecting to handle
2459 * fabric acknowledgement that requires two target_put_sess_cmd()
2460 * invocations before se_cmd descriptor release.
2461 */
054922bb 2462 if (ack_kref)
a6360785 2463 kref_get(&se_cmd->cmd_kref);
7481deb4 2464
a17f091d 2465 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2466 if (se_sess->sess_tearing_down) {
2467 ret = -ESHUTDOWN;
2468 goto out;
2469 }
a17f091d 2470 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2471out:
a17f091d 2472 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2473
2474 if (ret && ack_kref)
afc16604 2475 target_put_sess_cmd(se_cmd);
7544e597 2476
bc187ea6 2477 return ret;
a17f091d 2478}
20361e69 2479EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2480
7481deb4 2481static void target_release_cmd_kref(struct kref *kref)
077aa3b2 2482 __releases(&se_cmd->se_sess->sess_cmd_lock)
a17f091d 2483{
7481deb4
NB		 2484 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2485 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2486
a17f091d 2487 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2488 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2489 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2490 return;
a17f091d 2491 }
a17f091d 2492 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2493 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2494 complete(&se_cmd->cmd_wait_comp);
7481deb4 2495 return;
a17f091d
NB		 2496 }
2497 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2498 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2499
7481deb4
NB		 2500 se_cmd->se_tfo->release_cmd(se_cmd);
2501}
2502
2503/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2504 * @se_cmd: command descriptor to drop
2505 */
afc16604 2506int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2507{
afc16604
BVA		 2508 struct se_session *se_sess = se_cmd->se_sess;
2509
0ed6e189
NB		 2510 if (!se_sess) {
2511 se_cmd->se_tfo->release_cmd(se_cmd);
2512 return 1;
2513 }
ccf5ae83
JE		 2514 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2515 &se_sess->sess_cmd_lock);
a17f091d
NB		 2516}
2517EXPORT_SYMBOL(target_put_sess_cmd);
2518
1c7b13fe
RD		 2519/* target_sess_cmd_list_set_waiting - Flag all commands in
2520 * sess_cmd_list to complete cmd_wait_comp. Set
2521 * sess_tearing_down so no more commands are queued.
2522 * @se_sess: session to flag
a17f091d 2523 */
1c7b13fe 2524void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2525{
2526 struct se_cmd *se_cmd;
2527 unsigned long flags;
2528
a17f091d 2529 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2530 if (se_sess->sess_tearing_down) {
2531 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2532 return;
2533 }
1c7b13fe 2534 se_sess->sess_tearing_down = 1;
9b31a328 2535 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2536
9b31a328 2537 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2538 se_cmd->cmd_wait_set = 1;
2539
2540 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2541}
1c7b13fe 2542EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2543
2544/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2545 * @se_sess: session to wait for active I/O
a17f091d 2546 */
be646c2d 2547void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2548{
2549 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2550 unsigned long flags;
a17f091d
NB		 2551
2552 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2553 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2554 list_del(&se_cmd->se_cmd_list);
2555
2556 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2557 " %d\n", se_cmd, se_cmd->t_state,
2558 se_cmd->se_tfo->get_cmd_state(se_cmd));
2559
be646c2d
JE		 2560 wait_for_completion(&se_cmd->cmd_wait_comp);
2561 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2562 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2563 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2564
2565 se_cmd->se_tfo->release_cmd(se_cmd);
2566 }
9b31a328
NB		 2567
2568 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2569 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2570 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2571
a17f091d
NB		 2572}
2573EXPORT_SYMBOL(target_wait_for_sess_cmds);
2574
b3eeea66 2575void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2576{
5277797d 2577 percpu_ref_kill(&lun->lun_ref);
5277797d 2578 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2579}
2580
d14921d6
NB		 2581/**
2582 * transport_wait_for_tasks - wait for completion to occur
2583 * @cmd: command to wait
c66ac9db 2584 *
d14921d6
NB		 2585 * Called from frontend fabric context to wait for storage engine
2586 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2587 */
a17f091d 2588bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2589{
2590 unsigned long flags;
2591
a1d8b49a 2592 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2593 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2594 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2595 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2596 return false;
d14921d6 2597 }
cb4f4d3c 2598
c8e31f26
AG		 2599 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2600 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2601 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2602 return false;
d14921d6 2603 }
7d680f3b 2604
3d28934a 2605 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2606 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2607 return false;
d14921d6 2608 }
c66ac9db 2609
7d680f3b 2610 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2611
649ee054
BVA		 2612 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n",
2613 cmd, cmd->tag, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2614
a1d8b49a 2615 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2616
a1d8b49a 2617 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2618
a1d8b49a 2619 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2620 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2621
649ee054
BVA		 2622 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n",
2623 cmd->tag);
c66ac9db 2624
d14921d6 2625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2626
2627 return true;
c66ac9db 2628}
d14921d6 2629EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2630
2631static int transport_get_sense_codes(
2632 struct se_cmd *cmd,
2633 u8 *asc,
2634 u8 *ascq)
2635{
2636 *asc = cmd->scsi_asc;
2637 *ascq = cmd->scsi_ascq;
2638
2639 return 0;
2640}
2641
76736db3
SG		 2642static
2643void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2644{
2645 /* Place failed LBA in sense data information descriptor 0. */
2646 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2647 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2648 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2649 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2650
2651 /* Descriptor Information: failing sector */
2652 put_unaligned_be64(bad_sector, &buffer[12]);
2653}
2654
de103c93
CH		 2655int
2656transport_send_check_condition_and_sense(struct se_cmd *cmd,
2657 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2658{
2659 unsigned char *buffer = cmd->sense_buffer;
2660 unsigned long flags;
c66ac9db
NB		 2661 u8 asc = 0, ascq = 0;
2662
a1d8b49a 2663 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2664 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2665 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2666 return 0;
2667 }
2668 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2669 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2670
2671 if (!reason && from_transport)
2672 goto after_reason;
2673
2674 if (!from_transport)
2675 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2676
c66ac9db
NB		 2677 /*
2678 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2679 * SENSE KEY values from include/scsi/scsi.h
2680 */
2681 switch (reason) {
ba829137
HR		 2682 case TCM_NO_SENSE:
2683 /* CURRENT ERROR */
2684 buffer[0] = 0x70;
2685 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2686 /* Not Ready */
2687 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2688 /* NO ADDITIONAL SENSE INFORMATION */
2689 buffer[SPC_ASC_KEY_OFFSET] = 0;
2690 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2691 break;
c66ac9db 2692 case TCM_NON_EXISTENT_LUN:
eb39d340 2693 /* CURRENT ERROR */
9c58b7dd
RD		 2694 buffer[0] = 0x70;
2695 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2696 /* ILLEGAL REQUEST */
9c58b7dd 2697 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2698 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2699 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2700 break;
c66ac9db
NB		 2701 case TCM_UNSUPPORTED_SCSI_OPCODE:
2702 case TCM_SECTOR_COUNT_TOO_MANY:
2703 /* CURRENT ERROR */
9c58b7dd
RD		 2704 buffer[0] = 0x70;
2705 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2706 /* ILLEGAL REQUEST */
9c58b7dd 2707 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2708 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2709 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2710 break;
2711 case TCM_UNKNOWN_MODE_PAGE:
2712 /* CURRENT ERROR */
9c58b7dd
RD		 2713 buffer[0] = 0x70;
2714 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2715 /* ILLEGAL REQUEST */
9c58b7dd 2716 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2717 /* INVALID FIELD IN CDB */
9c58b7dd 2718 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2719 break;
2720 case TCM_CHECK_CONDITION_ABORT_CMD:
2721 /* CURRENT ERROR */
9c58b7dd
RD		 2722 buffer[0] = 0x70;
2723 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2724 /* ABORTED COMMAND */
9c58b7dd 2725 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2726 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2727 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2728 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2729 break;
2730 case TCM_INCORRECT_AMOUNT_OF_DATA:
2731 /* CURRENT ERROR */
9c58b7dd
RD		 2732 buffer[0] = 0x70;
2733 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2734 /* ABORTED COMMAND */
9c58b7dd 2735 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2736 /* WRITE ERROR */
9c58b7dd 2737 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2738 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2739 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2740 break;
2741 case TCM_INVALID_CDB_FIELD:
2742 /* CURRENT ERROR */
9c58b7dd
RD		 2743 buffer[0] = 0x70;
2744 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2745 /* ILLEGAL REQUEST */
9c58b7dd 2746 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2747 /* INVALID FIELD IN CDB */
9c58b7dd 2748 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2749 break;
2750 case TCM_INVALID_PARAMETER_LIST:
2751 /* CURRENT ERROR */
9c58b7dd
RD		 2752 buffer[0] = 0x70;
2753 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2754 /* ILLEGAL REQUEST */
9c58b7dd 2755 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2756 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2757 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2758 break;
bb992e72
RD		 2759 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2760 /* CURRENT ERROR */
2761 buffer[0] = 0x70;
2762 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2763 /* ILLEGAL REQUEST */
2764 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2765 /* PARAMETER LIST LENGTH ERROR */
2766 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2767 break;
c66ac9db
NB		 2768 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2769 /* CURRENT ERROR */
9c58b7dd
RD		 2770 buffer[0] = 0x70;
2771 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2772 /* ABORTED COMMAND */
9c58b7dd 2773 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2774 /* WRITE ERROR */
9c58b7dd 2775 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2776 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2777 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2778 break;
2779 case TCM_SERVICE_CRC_ERROR:
2780 /* CURRENT ERROR */
9c58b7dd
RD		 2781 buffer[0] = 0x70;
2782 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2783 /* ABORTED COMMAND */
9c58b7dd 2784 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2785 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2786 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2787 /* N/A */
9c58b7dd 2788 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2789 break;
2790 case TCM_SNACK_REJECTED:
2791 /* CURRENT ERROR */
9c58b7dd
RD		 2792 buffer[0] = 0x70;
2793 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2794 /* ABORTED COMMAND */
9c58b7dd 2795 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2796 /* READ ERROR */
9c58b7dd 2797 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2798 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2799 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2800 break;
2801 case TCM_WRITE_PROTECTED:
2802 /* CURRENT ERROR */
9c58b7dd
RD		 2803 buffer[0] = 0x70;
2804 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2805 /* DATA PROTECT */
9c58b7dd 2806 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2807 /* WRITE PROTECTED */
9c58b7dd 2808 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2809 break;
e2397c70
RD		 2810 case TCM_ADDRESS_OUT_OF_RANGE:
2811 /* CURRENT ERROR */
9c58b7dd
RD		 2812 buffer[0] = 0x70;
2813 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2814 /* ILLEGAL REQUEST */
9c58b7dd 2815 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2816 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2817 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2818 break;
c66ac9db
NB		 2819 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2820 /* CURRENT ERROR */
9c58b7dd
RD		 2821 buffer[0] = 0x70;
2822 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2823 /* UNIT ATTENTION */
9c58b7dd 2824 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2825 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2826 buffer[SPC_ASC_KEY_OFFSET] = asc;
2827 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2828 break;
2829 case TCM_CHECK_CONDITION_NOT_READY:
2830 /* CURRENT ERROR */
9c58b7dd
RD		 2831 buffer[0] = 0x70;
2832 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2833 /* Not Ready */
9c58b7dd 2834 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2835 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2836 buffer[SPC_ASC_KEY_OFFSET] = asc;
2837 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2838 break;
818b571c
NB		 2839 case TCM_MISCOMPARE_VERIFY:
2840 /* CURRENT ERROR */
2841 buffer[0] = 0x70;
2842 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2843 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2844 /* MISCOMPARE DURING VERIFY OPERATION */
2845 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2846 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2847 break;
fcc4f17b
NB		 2848 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2849 /* CURRENT ERROR */
2850 buffer[0] = 0x70;
2851 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2852 /* ILLEGAL REQUEST */
2853 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2854 /* LOGICAL BLOCK GUARD CHECK FAILED */
2855 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2856 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
76736db3 2857 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2858 break;
2859 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2860 /* CURRENT ERROR */
2861 buffer[0] = 0x70;
2862 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2863 /* ILLEGAL REQUEST */
2864 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2865 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2866 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2867 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
76736db3 2868 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2869 break;
2870 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2871 /* CURRENT ERROR */
2872 buffer[0] = 0x70;
2873 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2874 /* ILLEGAL REQUEST */
2875 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2876 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2877 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2878 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
76736db3 2879 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b 2880 break;
c66ac9db
NB		 2881 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2882 default:
2883 /* CURRENT ERROR */
9c58b7dd
RD		 2884 buffer[0] = 0x70;
2885 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2886 /*
2887 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2888 * Solaris initiators. Returning NOT READY instead means the
2889 * operations will be retried a finite number of times and we
2890 * can survive intermittent errors.
2891 */
2892 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2893 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2894 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2895 break;
2896 }
2897 /*
2898 * This code uses linux/include/scsi/scsi.h SAM status codes!
2899 */
2900 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2901 /*
2902 * Automatically padded, this value is encoded in the fabric's
2903 * data_length response PDU containing the SCSI defined sense data.
2904 */
9c58b7dd 2905 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2906
2907after_reason:
e5c0d6ad 2908 trace_target_cmd_complete(cmd);
07bde79a 2909 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2910}
2911EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2912
2913int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2914{
c18bc7d8
RD		 2915 if (!(cmd->transport_state & CMD_T_ABORTED))
2916 return 0;
c66ac9db 2917
68259b5a
AL		 2918 /*
2919 * If cmd has been aborted but either no status is to be sent or it has
2920 * already been sent, just return
2921 */
2922 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2923 return 1;
8b1e1244 2924
649ee054
BVA		 2925 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n",
2926 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2927
68259b5a 2928 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2929 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2930 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2931 cmd->se_tfo->queue_status(cmd);
2932
2933 return 1;
c66ac9db
NB		 2934}
2935EXPORT_SYMBOL(transport_check_aborted_status);
2936
2937void transport_send_task_abort(struct se_cmd *cmd)
2938{
c252f003
NB		 2939 unsigned long flags;
2940
2941 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2942 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2943 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2944 return;
2945 }
2946 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2947
c66ac9db
NB		 2948 /*
2949 * If there are still expected incoming fabric WRITEs, we wait
2950 * until until they have completed before sending a TASK_ABORTED
2951 * response. This response with TASK_ABORTED status will be
2952 * queued back to fabric module by transport_check_aborted_status().
2953 */
2954 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2955 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2956 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 2957 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
29f4c090 2958 return;
c66ac9db
NB		 2959 }
2960 }
2961 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2962
72b59d6e
RD		 2963 transport_lun_remove_cmd(cmd);
2964
649ee054
BVA		 2965 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
2966 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2967
e5c0d6ad 2968 trace_target_cmd_complete(cmd);
e3d6f909 2969 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2970}
2971
af877292 2972static void target_tmr_work(struct work_struct *work)
c66ac9db 2973{
af877292 2974 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2975 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2976 struct se_tmr_req *tmr = cmd->se_tmr_req;
2977 int ret;
2978
2979 switch (tmr->function) {
5c6cd613 2980 case TMR_ABORT_TASK:
3d28934a 2981 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2982 break;
5c6cd613
NB		 2983 case TMR_ABORT_TASK_SET:
2984 case TMR_CLEAR_ACA:
2985 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2986 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2987 break;
5c6cd613 2988 case TMR_LUN_RESET:
c66ac9db
NB		 2989 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2990 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2991 TMR_FUNCTION_REJECTED;
2992 break;
5c6cd613 2993 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2994 tmr->response = TMR_FUNCTION_REJECTED;
2995 break;
5c6cd613 2996 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2997 tmr->response = TMR_FUNCTION_REJECTED;
2998 break;
c66ac9db 2999 default:
6708bb27 3000 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3001 tmr->function);
3002 tmr->response = TMR_FUNCTION_REJECTED;
3003 break;
3004 }
3005
3006 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3007 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3008
b7b8bef7 3009 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3010}
3011
af877292
CH		 3012int transport_generic_handle_tmr(
3013 struct se_cmd *cmd)
c66ac9db 3014{
f15e9cd9
NB		 3015 unsigned long flags;
3016
3017 spin_lock_irqsave(&cmd->t_state_lock, flags);
3018 cmd->transport_state |= CMD_T_ACTIVE;
3019 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3020
af877292
CH		 3021 INIT_WORK(&cmd->work, target_tmr_work);
3022 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3023 return 0;
3024}
af877292 3025EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3026
3027bool
3028target_check_wce(struct se_device *dev)
3029{
3030 bool wce = false;
3031
3032 if (dev->transport->get_write_cache)
3033 wce = dev->transport->get_write_cache(dev);
3034 else if (dev->dev_attrib.emulate_write_cache > 0)
3035 wce = true;
3036
3037 return wce;
3038}
3039
3040bool
3041target_check_fua(struct se_device *dev)
3042{
3043 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3044}
Linux kernel - Deliverables
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